ICS 75.160.30
CCS F13
CAPID
中 国 产 业 发 展 促 进 会 团 体 标 准
T/CAP ID 009—2024
零碳能源证书自愿核证体系 生物天然气
核证规范
The voluntary certification scheme for zero carbon energy certificates : Specification
for certification of bio-natural gas
2024 - 7 - 22 发布 2024 - 8 - 1 实施
中国产业发展促进会 发 布
T/CAP ID 009—2024
前 言
本文件按照GB/T 1.1—2020《标准化工作导则 第1部分：标准化文件的结构和起草规则》的规定起草。
本文件由中国产业发展促进会提出。
本文件由中国产业发展促进会生物质能产业分会归口管理。
本文件主要起草单位：中国产业发展促进会生物质能产业分会
中节能大数据有限公司
北京松杉低碳技术研究院有限公司
中国能源研究会绿色低碳技术专业委员会
北京市燃气集团有限责任公司
广东能源集团节能降碳有限公司
中国华电科工集团有限公司
本文件参与起草单位：国家发展和改革委员会能源研究所
国际能源署生物质能中国组
落基山研究所(美国)北京代表处
成都中科能源环保有限公司
巴斯夫(中国)有限公司
中国农业大学生物质工程中心
华南农业大学生物质工程研究院
北京大学能源研究院
华晨宝马汽车有限公司
奥迪一汽新能源汽车有限公司
沃尔沃汽车(亚太)投资控股有限公司
中汽信息科技(天津)有限公司
华润燃气投资(中国)有限公司
中国质量认证中心有限公司
中环联合(北京)认证中心有限公司
北京绿色交易所有限公司
天津排放权交易所有限公司
必维认证(北京)有限公司
北京绿林认证有限公司
国能生物发电集团有限公司
中船环境工程有限公司
液化空气(上海)新能源科技有限公司
山西能投生物质能开发利用股份有限公司
镇江华润燃气有限公司
黑龙江博能绿色能源科技集团股份有限公司
中节环(北京)环境科技股份有限公司
江苏久源生物能源有限公司
内蒙古弘达生物环保科技有限责任公司
本文件主要起草人：郑朝晖、张大勇、刘洪荣、王乐乐、高永华、张一帆、郭晓翔、刘钟毓、付春阳、袁彧、曹印锋、杨志军、张峰、高建勇、陈敏锐、张晓龙、赵梦、任东明、李婷、黄显波、张建、朱万斌、谢君、孙慧、赵明、孙霓、王千锐、王舒微、于莉、吴宪文、王洪亮、谭涛、杨雷、姜立雪、韩建军、张杰、张永康、韩翠莲、黄敏、吴盛富、吕英胜、刘海鑫、田春哺、牛海晖、李晶、宋锦东、张同强、闵亮、张骋远。
本文件为首次发布。
引 言
《“十四五”可再生能源发展规划》明确提出要建立健全绿色能源消费机制，建立绿色能源消费评价、认证与标识体系。当前，我国绿色电力证书核发及自愿认购体系基本建立，但可再生能源的非电利用缺乏相应机制，环境权益实现途径仍然缺失。如绿色热能、绿色燃气、绿色液体燃料等，暂未形成相应的证书认证、核发、交易体系，难以体现和证明该类能源的环境权益。
为贯彻落实国家双碳战略决策部署，促进我国可再生能源高质量发展，创建可再生能源环境权益多元化实现机制，中国产业发展促进会生物质能产业分会组织相关企业和专家制定了“零碳能源证书自愿核证体系”系列标准，旨在建立可再生能源非电领域的绿色能源认证、消费机制，进一步体现可再生能源的环境权益。
《零碳能源证书自愿核证体系 通则》作为零碳能源证书自愿核证体系的统领性文件，确立了核证体系的架构，明确了各相关方的职责，规范了从证书的核证到注销的全生命周期流程，保证了零碳能源证书的环境权益。
针对可再生能源非电利用具体方式制定“零碳能源证书自愿核证体系 核证规范”系列标准，涵盖可再生能源非电利用各领域，为不同类型可再生能源项目的核证提供规范指导， 旨在保证零碳能源证书核证的合规性、自愿性、唯一性、透明性、准确性、保守性等。
本文件为生物天然气领域中零碳能源证书的核证工作提供了核算边界、核算步骤与方法、核算数据来源、数据质量管理、核查程序、核证程序的必要参考，涵盖了生物天然气领域零碳能源证书核证工作当中的主要环节，规范了核证工作，保障核证质量，为相关主体参与零碳能源证书自愿核证工作提供了指导和参考。
零碳能源证书自愿核证体系 生物天然气核证规范
1 范围
本文件规定了对生物天然气项目开展零碳能源证书核证工作的核算范围和边界、核算步骤与方法、数据质量管理、核查程序、核证程序等内容。
本文件适用于生物天然气项目零碳能源证书的核算、核查和核证。其他类型沼气工程项目参照执行。
2 规范性引用文件
下列文件中的内容通过文中的规范性引用而构成本文件必不可少的条款。其中，注日期的引用文件，仅该日期对应的版本适用于本文件;不注日期的引用文件，其最新版本(包括所有的修改单)适用于本文件。
GB/T 2589—2020 综合能耗计算通则
GB/T 11062 天然气 发热量、密度、相对密度和沃泊指数的计算方法
GB 17167 用能单位能源计量器具配备和管理通则
GB/T 18603 天然气计量系统技术要求
GB/T 29488—2013 中大功率沼气发电机组
GB/T 30366—2013 生物质术语
GB/T 35211 天然气发热量的测量 连续燃烧法
GB/T 41328—2022 生物天然气
JJF 1993—2022 天然气能量计量技术规范
NY/T 3239 沼气工程远程监测技术规范
NB/T 10865—2021 生物天然气工程可行性研究报告编制规程
T/CAPID 006 零碳能源证书自愿核证体系 通则
T/CAPID 007 零碳能源证书自愿核证体系 生物质热能核证规范
3 术语和定义
GB/T 30366—2013和NB/T 10865—2021界定的以及下列术语和定义适用于本文件。
3.1
生物天然气 bio-natural gas;BNG
以农作物秸秆、畜禽粪污、农副产品加工废水废渣、厨余垃圾、市政污泥等各类城乡有机废弃物为原料，经厌氧发酵和净化提纯产生的可再生天然气。
[来源：NB/T 10865—2021，定义2.0.1]
3.2
沼气 biogas
生物质在一定温度、湿度、酸碱度和厌氧条件下，经厌氧沼气微生物发酵及分解作用而产生的一种以甲烷为主要成分的混合可燃气体。
[来源：GB/T 30366—2013，定义2.4.6]
3.3
申请核证主体 subject of application for certification
在核证平台进行自愿注册账户、申请核证等行为的主体。
[来源：T/CAPID 006—2023，定义3.5]
4 核算范围和边界
4.1 核算范围
申请核证主体应通过核证平台核算和报告其生产系统内用于生产生物天然气涉及的所有能源活动中使用的各类能源，包括使用的可再生能源及化石能源种类、用量等，最终核算出生产的生物天然气对应的零碳能源量。
4.2 核算边界
4.2.1 申请核证主体应确定零碳能源证书的核算边界与涉及的时间范围。
4.2.2 申请核证主体应以企业法人或视同法人的独立核算单位为边界，核算和报告其生产系统产生或供应的零碳能源量。生产系统包括主要生产系统、辅助生产系统、以及直接为生产服务的附属生产系统，其中辅助生产系统包括动力、供电、供水、化验、机修、库房、运输等，附属生产系统包括生产指挥系统(厂部)和厂区内为生产服务的部门和单位(如职工食堂、车间浴室、保健站等)。生产系统存在不同的产品工艺生产线时，应将生物天然气的生产线进行区分单独核算和报告。生产线区分不开时，应进行保守处理。
4.2.3 核算边界的确定宜参考申请核证主体的设施和业务范围及生产工艺流程图。如图 1 所示，核算边界应包括：原料运输阶段、生物天然气生产阶段中的各类能源。如原料运输时使用的化石能源，生产系统中使用的化石能源量、外购的电力、外购的热力、对外供应生物天然气的能量等。
图1 核算边界示意图
5 核算步骤与方法
5.1 核算步骤
申请核证主体进行核算与报告的工作流程包括以下步骤：
a) 确认核算边界，收集各阶段的活动数据;
b) 分别计算核算边界内生物天然气的原料运输阶段使用的化石能源量，生物天然气生产阶段使用的化石能源量、消耗外购的电力、消耗外购的热力、对外供应生物天然气的能量等各类能源量;
c) 汇总核算申请核证主体生产及对外供应的生物天然气对应的零碳能源量及相关信息;
d) 形成核算报告。
5.2 核算方法
申请核证主体申请项目核证的零碳能源量Qz ，按公式(1)计算：
Qz = Qjc _ Qys _ Qsc ·································································· (1)
式中：
Qz——零碳能源量，即核证能源量，核发的零碳能源证书对应的能量，单位为吉焦(GJ);
Qjc——核证平台在线监测的申请核证主体对外供应生物天然气总量，单位为吉焦(GJ);
Qys——在原料运输阶段，使用的化石能源的能量，单位为吉焦(GJ);
Qsc——在生物天然气生产阶段，用于生物天然气生产的化石来源能源总量，单位为吉焦(GJ)。
5.3 原料运输阶段的能量
原料运输阶段中使用的化石能源总能量，可基于化石能源的使用量及相应热值计算得到，按公式(2)计算：
Qys = Σqi x mi ········································································ (2)
式中：
qi——第i种化石能源的平均低位发热量，单位为吉焦每吨或吉焦每标准立方米(GJ/t或GJ/Nm3);
mi——第i种化石能源的质量，单位为吨或标准立方米(t或Nm3 );
i——化石能源的种类i。
注：化石能源的平均低位发热量，可参考附录A、GB/T 2589—2020或通过相应标准测量。
运输车辆的化石能源使用量，可基于运输距离和单位行驶里程能耗计算得到，按公式(3)计算：
mi = Σn ocn,i x ci x Dn,i ······························································· (3)
式中：
ocn,i ——运输车辆"的百公里燃油(气)量，单位为升/百公里或立方米/百公里(L/100km或m3/100km);
ci——第i种化石燃料的密度，单位为吨每立方米或吨每立方米升(t/m3或t/L);
Dn,i——第"个运输车辆的行驶里程，单位为公里(km);
i——化石能源的种类i;
"——运输车辆的类型"。
运输车辆使用电车时，化石能源电量按公式(4)计算：
Qys = ΣnEcn x 3.6 ···································································· (4)
式中：
Ecn——运输车辆"总电力消耗量，单位为兆瓦时(MW ·h);
3.6——换算系数，单位为吉焦每兆瓦时(GJ/MW ·h)。
注：可再生能源电量应单独核算且需提供相关证明材料，并在报告中给予说明，但不计入原料运输阶段的能量。
无法提供相关证明材料时，全部视为化石能源电量。
5.4 生物天然气生产阶段的能量
在能源生产阶段，用于生物天然气生产的化石来源能源总量Qsc ，按公式(5)计算：
Qsc = Qhs + Qyd + Qyr ································································· (5)
式中：
Qhs——在生物天然气生产阶段，用于生物天然气生产的化石能源总量，单位为吉焦(GJ);
Qyd——在生物天然气生产阶段，用于生产生物天然气的用电总量，单位为吉焦(GJ);
Qyr——在生物天然气生产阶段，用于生产生物天然气的用热总量，单位为吉焦(GJ)。
5.4.1 用于生产生物天然气的化石能源总量
生物天然气生产阶段用于生产生物天然气的化石能源总量Qhs ，应根据生产系统中的化石能源使用数量及相应热值，按公式(2)计算。
5.4.2 用于生产生物天然气的用电总量
生物天然气生产阶段用于生产生物天然气的用电总量Qyd ，应根据核算边界内下网电量的电表获取数据计入，按公式(6)计算：
Qyd = Ecyd x 3.6 ······································································ (6)
式中：
Ecyd——在生物天然气生产阶段，生产生物天气消耗的电网电量，单位为兆瓦时(MW ·h);
3.6——换算系数，单位为吉焦每兆瓦时(GJ/MW ·h)。
存在厂内自用电则应辨别自用电属性来源，可再生能源电量应单独核算且需提供相关证明材料，并在报告中给予说明，但不计入生产生物天然气的用电总量。无法提供相关证明材料时，全部视为化石能源电量。
来自厂内化石燃料的自发电时，应按5.4.1计入化石能源总量。
5.4.3 用于生产生物天然气的用热总量
生物天然气生产阶段用于生产生物天然气的用热总量Qyr ，来自外部时应根据核算边界内的热量计或蒸汽流量计获取数据计入，参照T/CAPID 007执行，按公式(7)计算：
Qyr = myr × (h _ 83.74) × 10_3······················································ (7)
式中：
myr——蒸汽的质量，单位为吨蒸汽(t);
h——蒸汽所对应的温度、压力下每千克蒸汽的焓值，取值参考相关行业标准，单位为千焦/千克(kJ/kg);
83.74——水温为20℃时的焓值，单位为千焦/千克(kJ/kg);
10_3——单位换算系数，无量纲。
可再生能源热量应单独核算且需提供相关证明材料，并在报告中给予说明，但不计入生产生物天然气的用热总量。无法提供相关证明材料时，全部视为化石能源热量。
来自厂内化石燃料的供热时，应按5.4.1计入化石能源总量。
5.5 对外供应的生物天然气总能量
生物天然气计量系统宜符合GB/T 18603的规定。计量使用的标准参比条件应为101.325 kPa、 20 ℃, 低位发热量以干基计。
核证平台在线监测申请核证主体对外供应的生物天然气总能量Qjc ，应参照JJF 1993—2022执行，按公式(8)计算：
Qjc = Σ V × Hjc × 10_3 ································································ (8)
式中：
V——监测对外供应的生物天然气或沼气的体积，单位为立方米(m3 );
Hjc——20 ℃、101.325 KPa时，监测对外供应的生物天然气或沼气的低位发热量，单位为兆焦每立方米(MJ/m3 )。
申请核证主体应根据项目现场监测条件选择相应标准进行实测或计算生物天然气的的低位发热量Hjc。
生物天然气的的低位发热量Hjc 的确定包括以下三种方法：
a) 当具备直接法测量条件时，生物天然气的低位发热量按照 GB/T 35211 计算;
b) 当具备间接法测量条件时，生物天然气的低位发热量按照 GB/T 11062 计算;
c) 当现场两者均不具备条件时，生物天然气的低位发热量根据甲烷摩尔含量保守处理，数值范围如表 1 所示。
表1 沼气及生物天然气的发热量与甲烷摩尔含量对照表
5.6 核算数据来源
5.6.1 核算数据获取顺序
监测设备应符合国家标准、地方标准和行业标准的规定，且按规定定期对仪器仪表进行校核，保证核算数据的准确性。核算零碳能源证书的数据获取优先级如表2所示：
表2 数据获取优先级
5.6.2 核算数据获取频率
除核证平台实时监测的数据外，核算数据应按申请核证主体监测计划规定的频率获取。监测计划应符合国家和地方法律法规、政策、标准的规定。
6 数据质量管理
申请核证主体应加强目零碳能源证书中的数据质量管理工作，包括但不限于：
a) 建立企业生物天然气零碳能源证书核算和报告的规章制度，包括负责机构和人员、工作流程和内容、工作周期和时间节点等;指定专职人员负责企业零碳能源证书核算和报告工作;
b) 根据零碳能源证书核算数据的重要程度对其进行等级划分，并建立企业零碳能源证书核算数据一览表，对于不同等级的核算数据的获取提出相应的要求;
c) 按 GB 17167 及 NY/T 3239 的规定对现有监测条件进行评估，不断提高自身监测能力，并制定相应的监测计划，包括对活动数据等参数的监测;定期对计量器具、检测设备和在线监测仪表进行维护管理，并记录存档;
d) 建立健全的零碳能源证书数据记录管理体系，包括数据来源、数据获取时间及相关责任人等信息的记录管理;
e) 建立零碳能源证书报告内部审核制度，定期对生产活动数据进行交叉校验，对可能产生的数据误差风险进行识别，并提出相应的解决方案。
7 核查程序
7.1 核查原则
7.1.1 客观独立
核查机构应保持独立于核证的项目活动，避免偏见以及利益冲突，在整个核查活动过程中保持客观。
7.1.2 公平公正
核查机构在核查活动中的发现、结论及报告应真实、准确。除报告核证过程中的重要障碍，还应报告未解决的意见分歧。
7.1.3 诚实守信
核查机构应具有高度的责任感，确保核查工作的完整性和保密性。
7.1.4 专业严谨
核查机构应具备核查必需的专业技能，能够根据任务的重要性及客户的具体要求，利用其职业素养进行专业判断。
7.2 核查程序
7.2.1 核查流程
核查机构开展零碳能源证书核查的流程分为三个阶段，具体如图2所示。
图2 核查机构核查流程
7.2.2 准备阶段
核查机构收到核证平台通知后，应根据申请核证主体的项目情况、核查员的专业领域和技术能力组成具有专业技能的核查组，提前做好核查准备。
7.2.3 实施阶段
核查机构应按照相应的核证标准及要求开展核查工作，在判断核查材料的合理性、确定现场访问的重点并制定现场访问计划后，采取多种有效方式实施现场访问。核查机构应当根据核查发现编制核查报告并做技术复核，保证核查报告真实、客观、逻辑清晰。
7.2.4 报告阶段
核查机构在完成技术复核后，将核查报告及相关支撑材料提交核证平台。核查机构应当以安全和保密的方式保管核查过程中的全部书面和电子文件，保存期至少10年。
7.3 核查内容
核查机构应依据核证平台的核查办法及相关要求进行核查，确认项目核证的零碳能源证书是否具有唯一性、核算结果的合理性，核实生产设施、核查测量设备的配置和监测系统的运行、确认监测计划的执行情况等。
对于生物天然气的核查应明确生物天然气的原料类型及来源，原料分类参见附录B。若不在附录内，应核实原料是否为有机废弃物，并在报告中给予说明。
对外供应生物天然气的总能量应进行交叉验证，确保生产系统提纯前的沼气总能量大于对外供应生物天然气的总能量。否则，应核实问题来源并在报告中给予说明，提纯前的沼气总能量视为对外供应生物天然气的总能量。
8 核证程序
零碳能源证书的核证程序应按T/CAPID 006及相关规定执行。
附 录 A
(资料性)
能源换算及参考值
对于不同能源间的换算应参照GB/T 2589—2020的相关规定进行换算，能量单位统一为吉焦(GJ)。如能量单位非焦耳，则通过标准煤量进行换算成吉焦。
表A.1 各种能源折标准煤系数(参考值)
附 录 B
(规范性)
沼气及生物天然气的主要原料类型
沼气及生物天然气的主要原料类型如表B.1所示。
表B.1 沼气及生物天然气的主要原料类型
附 录 C
(资料性)
生物天然气零碳能源证书核算
C.1 原料运输阶段的能量(Qys)
C.2 生物天然气生产阶段用于生产生物天然气的化石能源总量(Qhs)
C.3 生物天然气生产阶段用于生产生物天然气的用电总量(Qyd)
C.4 生物天然气生产阶段用于生产生物天然气的用热总量(Qyr)
C.5 生物天然气生产阶段用于生物天然气生产的化石来源能源总量(Qsc)
C.6 对外供应的生物天然气总能量(Qjc)
C.7 核算的零碳能源量(Qzj)
参 考 文 献
[1]GB/T 40506—2021 生物天然气 术语
[2]RB/T 175—2018 生物质能可持续性认证要求
[3]中国发电企业 温室气体排放核算方法与报告指南(试行) 发改办气候〔2013〕2526号
[4]企业温室气体排放报告核查指南(试行) 环办气候函〔2021〕130号
[5]企业温室气体排放核算与报告指南 发电设施 环办气候函〔2022〕485号
ICS 75.160.30
CCS F13
CAPID
Association Standards of CAP ID
T/CAP ID 009—2024
Voluntary certification scheme for zero carbon energy certificates — Specification for certification of bio-natural gas
零碳能源证书自愿核证体系 生物天然气核证规范
(English Translation)
Issue Date:2024 - 7 - 22 Implementation Date:2024 - 8 - 1
Issued by China Association for the Promotion of Industrial Development
Foreword
CAPID is in charge of this English translation. In case of any doubt about the contents of English translation, the Chinese original shall be considered authoritative.
This standard is drafted in accordance with the rules given in the GB/T 1.1-2020 Directives for standardization-Part 1: Rules for the structure and drafting of standardizing Documents. This document is proposed by the China Association for the Promotion of Industrial Development (CAP ID).
This document was prepared by the Biomass Energy Industry Promotion Association of the China Association for the Promotion of Industrial Development (CAP ID).
This document was mainly drafted by:BE IPA
CECEP Big Data Co., Ltd
Beijing Songshan Low Carbon Technology Research Institute Co., Ltd
China Energy Research Society (CERS), Specialized Committee on Green and Low Carbon Technologies (SCGLCT) Beijing Gas Group Co.,Ltd.
Guangdong Energy Group Energy Conservation and Carbon Reduction Co., Ltd.
China Huadian Engineering Co., Ltd. This document was drafted with the participation of the drafting unit:
Energy Research Institute of the National Development and Reform Commission
International Energy Agency Biomass China GroupRocky Mountain Institute (USA) Beijing Representative Office Chengdu Zhongke Energy&environmental Protection
Co.,Ltd.
BASF (China) Co.,Ltd
Biomass Engineering Center, China Agricultural University
Institute of Biomass Engineering, South China Agricultural University
Institute of Energy, Peking University
BMW Brilliance Automotive Ltd.
Audi FAW New Energy Vehicle Co., Ltd.
Volvo Car (Asia Pacific) Investment Holding Co., Ltd.China Automotive Information Technology (Tianjin)
Co., Ltd
China Resources Gas Group Investment Co., Ltd.
China Quality Certification Center Co., Ltd
China Environmental United Certification Center (Beijing) Co., Ltd
China Beijing Green Exchange Co., Ltd.
Tianjin Climate Exchange Co., Ltd.
Bureau Veritas Certification (Beijing) Co., Ltd Beijing Green Forest Certification Co., Ltd.
Guoneng Biological Power Generation Co., Ltd.
Csic Environment Engineering Co., Ltd.
Liquefaction Air (Shanghai) New Energy Technology Co., Ltd.
Shanxi E&T Biomass Energy Development and Utilization
Co., Ltd
Zhenjiang China Resources Gas Co., Ltd.
Heilongjiang Boneng Green Energy Technology Group Co., Ltd.
Cee (Beijing) Environment Science Technology
Co.,Ltd.Jiangsu Jiuyuan Bioenergy Co., Ltd.
Inner Mongolia Hongda Biological Environmental Protection Technology Co., Ltd.
This document was mainly drafted by: Zheng Zhaohui, Zhang Dayong, Liu Hongrong, Wang Lele, Gao Yonghua, Zhang Yifan, Guo Xiaoxiang, Liu Zhongyu, Fu Chunyang, Yuan Yu, Cao Yinfeng, Yang Zhijun, Zhang Feng, Gao Jianyong, Chen Minrui, Zhang Xiao long, Zhao Meng, Ren Dongming, Li T ing, Huang Xianbo, Zhang Jian, Zhu Wanbin, Xie Jun, Sun Hui, Zhao Ming, Sun Ni, Wang Qianrui, Wang Shuwei, Yu Li, Wu Xianwen, Wang Hong liang, Tan Tao, Yang Lei, Jiang Lixue, Han Jianjun, Zhang Jie, Zhang Yongkang, Han Cui lian, Huang Min, Wu Shengfu, Lyu Yingsheng, Liu Haixin, Tian Chunbu, Niu Haihui, Li Jing, Song Jindong, Zhang Tongqiang, Min Liang, Zhang Chengyuan.
This document is the first edition.
Introduction
The "14th Five-Year Plan" for Renewable Energy Development explicitly proposes the establishment of a sound mechanism for green energy consumption and the establishment of a system for the evaluation, certification, and labelling of green energy consumption. At present, China's verification and issuance of green power certificates and voluntary subscription system is basically established, but a proper mechanism for the non-electric utilization of renewable energy is not available, and the way of realizing environmental rights and interests is still absent. For example, a corresponding verification and certificate trading system has not yet been formed for green thermal energy, green gas and green liquid fuels, making it difficult to manifest the environmental rights and interests of the energy.
In order to implement the national carbon peaking and carbon neutrality strategy, promote the high-quality development of China's renewable energy, and create a diversified mechanism for realizing the environmental rights and interests of renewable energy, the Biomass Energy Industry Promotion Association, CAP ID organized enterprises and experts to formulate the series standards for the "Voluntary Certification Scheme for Zero Carbon Energy Certificates" which is aimed at establishing a mechanism for the certification and consumption of non-electricity renewable energy, and further reflecting the environmental rights and interests of renewable energy.
As the guiding document, the Voluntary Certification Scheme for Zero Carbon Energy Certificates - General Rules establishes the structure of the certification system, clarifies the responsibilities of all relevant parties, and standardizes the whole life cycle from certification to cancellation of the certificates, so as to guarantee the environmental rights and interests of the Zero Carbon Energy Certificates.
A series of standards of Voluntary Certification Scheme for Zero Carbon Energy Certificates - Certification Code are formulated for specific renewable energy utilization, covering all areas of non-electricity utilization of renewable energy, providing normative guidance for the certification of different types of renewable energy projects, aiming to ensure compliance, voluntariness, uniqueness, transparency, accuracy, conservatism, etc.
This document provides the necessary references for the certification of zero-carbon energy certificates in the field of bio-natural gas in terms of the accounting scope and boundary, the accounting steps and methods, data quality management, the verification procedures, and the certification procedures, which covers the key links in the certification of zero- carbon energy certificates in the field of bio-natural gas, to regulate the certification work, to safeguard the quality of the certification, and to provide guidance and references for the participation of the relevant parties.
Voluntary certification scheme for zero carbon
energy certificates—Specification for
certification of bio-natural gas
1 Scope
This document specifies the accounting scope and boundary, accounting steps and methods, data quality management, verification procedures, and certification procedures for certification of zero-carbon energy certificates for bio-natural gas.
This document is applicable to the accounting, verification and certification of Zero Carbon Energy Certificates for bio-natural gas. Other type of biogas project shall be implemented accordingly.
2 Normative references
The contents of the following documents const itute indispensable provis ions of this document by means of normat ive references in the text. For dated references, on ly the ed it ion cited appl ies. For undated references, the latest ed it ion of the referenced document (includ ing any amendments) app l ies.
GB/T 2589 General rules for calculation of the comprehensive energy consumption
GB/T 11062 Natural gas—Calculation of calorific values, density, relative density and Wobbe indices from composition
GB 17167 General princip le for equipping and managing of the measuring instrument of energy in organization of energy using
GB/T 18603 Technical requirements of measuring systems for natural gas
GB/T 29488-2013 Medium/high-power biogas generating set
GB/T 30366-2013 Terminology Related to Biomass
GB/T 35211 Measurement of nature gas calorific value-Continuous combustion
GB/T 41328-2022 Biogas-based natural gas
JJF 1993-2022 Metrological Specification for the Energy Measurement of Natural Gas
NY/T 3239-2018 Technical specification of remote monitoring for biogas engineering
NB/T 10865-2021 Specification for Preparation of Feasibility Study Reportfor Bio-
natural Gas Projects
T/CAP ID 006 Voluntary certification scheme for zero carbon energy certificates— general rules
T/CAP ID 007 Voluntary certification scheme for zero carbon energy certificates— Specification for certification of biomass thermal energy
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 30366-2013 and NB/T 10865—2021 the following apply.
3.1
Bio-natural gas;BNG
The bio-natural gas produced through anaerobic digestion and purification, using various urban and rural organic wastes as raw materials, such as crop straw, livestock and poultry manure, wastewater and residue from agricultural by-products processing, kitchen waste, and municipal sludge.
NOTE: NB/T 10865—2021, Definition 2.0.1
3.2
Biogas
Biomass, under specific temperature, humidity, pH, and anaerobic conditions, undergoes anaerobic digestion and decomposition by microorganisms to produce a mixed combustible gas with methane as its main component.
NOTE: NB/T 30366—2013, Definition 2.4.6
3.3
Subject of application for certification
The Subject that voluntarily registers an account, applies for certification, and performs other actions on the certification platform.
NOTE:T/CAP ID 006—2023, Definition 3.5
4 Accounting content and boundaries
4.1 Accounting content
The subject applying for certification should, through the certification platform, calculate and report all types of energy used in all energy activities within its production system related to the production of bio-natural gas. This includes the types and quantities of renewable and fossil energies used, ultimately calculating the amount of net zero carbon energy corresponding to the produced bio-natural gas.
4.2 Accounting boundaries
4.2.1 The subject of application for certification shall identify the accounting boundaries and the timeframe involved in zero carbon energy certificates.
4.2.2 The subject of application for certification shall take as its boundary an enterprise legal person or a self-accounting unit treated as a legal person to account for and report the amount of zero-carbon energy generated or supplied by its production system. Production system includes the main production system, auxiliary system and accessorial system directly serving for the production; auxiliary system including dynamical system, power supply, water supply, laboratory, mechanic, warehouse, transportation, etc., and the accessorial system including the production commanding system (factory) as well as the departments and facilities serving for the production in the factory area (such as workers' cafeteria, workshop bathroom, health care station, etc.). When there are different product process lines within the production system, the production line for bio-natural gas should be separately calculated and reported. If the production lines cannot be distinguished, a conservative approach should be taken.
4.2.3 The determination of the accounting boundary should take reference to the facilities
and business scope of the subject of application for certification and their production process flow, which shall include various types of energy used during the raw material transportation and the bio-natural gas production, as shown in Figure 1. For instance, fossil energy used in the transportation of raw materials, fossil energy in the bio-natural gas production phase, purchased electricity, purchased heat, and the energy of bio-natural gas supplied externally.
Figure 1 Schematic diagram of the accounting boundary
5 Accounting steps and methods
5.1 Accounting steps
The workflow of accounting and reporting for the subject of application for certification includes the following steps:
a) Identify the accounting boundaries and collect data on activities on each phase;
b) Calculate separately the fossil energy used within the accounting boundary during the raw material transportation phase, the fossil energy used during the production phase, the consumption of purchased electricity, the consumption of purchased heat, and the energy of bio-natural gas supplied externally, etc.
c) Summarize and account for the zero-carbon energy produced and supplied by the subject of application for certification and other related information;
d) Formulate the accounting report.
5.2 Accounting method
The amount of zero-carbon energy that the subject of application for certification is applying to certify Qz , is calculated with equation (1):
Qz = Qjc _ Qys _ Qsc ··································································· (1)
where:
Qz—Zero carbon energy amount, i.e. certified energy amount, the energy corresponding to the issued zero carbon energy certificate, in gigajoule (GJ);
Qjc—The total amount of bio-natural gas supplied outside by the subject of application for certification that is monitored online by the certification platform, in gigajoule (GJ);
Qys—Energy from fossil energy sources used during the transportation of raw materials, in gigajoule (GJ);
Qsc—Energy from fossil energy sources used during the bio-natural gas production, in gigajoule (GJ).
5.3 Energy in the transportation of raw materials
The total fossil energy consumption in the raw material transportation is calculated according to equation (2), based on the fossil energy consumption and the corresponding calorific value:
Qys = ∑qi × mi ······································································· (2)
where:
qi——Dry basis low level calorific value of the Type i fossil energy source, in gigajoule per tons or g igajoule per Normal Cubic Meter(GJ/t or GJ/Nm3);
mi——Mass of the Type i fossil energy source, in tons or Normal Cubic Meter(t or Nm3); i——Type i of fossil energy.
NOTE: The dry basis low level calorific value of fossil energy can be measured with reference to Annex A, GB/T 2589-2020 or through corresponding standards.
The fossil energy consumption of transportation vehicles can be calculated based on the transportation distance and the energy consumption per unit mileage, using formula (3):
mi = ∑n ocn,i × ci × Dn,i ······························································· (3)
where:
ocn,i——The fuel (gas) consumption per 100 kilometers for transportation vehicles, in liters per 100 kilometers (L/100km) or cubic meters per 100 kilometers (m³/100km);
ci——Density of the Type i fossil energy source, in tons per cubic meters or tons per liters;
The mileage of the transportation vehicle, in kilometers (km);
i Type i of fossil energy;
n——Type n of transportation vehicle.
When transportation vehicles are powered by electricity, the consumption of electricity produced from fossil energy is calculated using formula (4):
Qys = ΣnEcn × 3.6 ···································································· (4)
where:
Ecn——The total electricity consumption of the transportation vehicles, in megawatt-hours (MW ·h);
3.6 The conversion factor, in gigajoule per megawatt-hour (GJ/MW ·h).
NOTE:Renewable electricity should be accounted for separately, and relevant supporting documentation must be provided and explained in the report. However, it should not be included in the energy calculation for the raw material transportation stage. If the relevant supporting documentation cannot be provided, all electricity will be considered as fossil energy electricity.
5.4 Energy in the bio-natural gas production phase
The total fossil energy consumption Qsc in bio-natural gas production phase is calculated according to equation (5).
Qsc = Qhs + Qyd + Qyr ································································· (5)
where:
Qhs——Total fossil energy used for bio-natural gas production in the gas production phase, in gigajoule (GJ);
Qyd——Total electricity used for bio-natural gas production in the gas production phase, in gigajoule (GJ);
Qyr——Total heat used for bio-natural gas production in the gas production phase, in gigajoule (GJ).
5.4.1 Total fossil energy used for bio-natural gas production
The total fossil energy used for bio-natural gas production during the gas production phase should be calculated based on the amount of fossil energy used in the production system and its corresponding calorific value, using formula (2).
5.4.2 Total electricity used for bio-natural gas production
The total electricity consumption used for bio-natural gas production in the gas production phase Qyd shall be accounted for on the basis of meter access data for off-grid electricity within the accounting boundary.
Qyd = Ecyd × 3.6 ······································································ (6)
where:
Ecyd——The totaln grid electricity consumption used for bio-natural gas production in the production phase, in megawatt-hours (MW ·h);
3.6——Conversion factor, in gigajoule per megawatt-hour (GJ/MW ·h).
In case of electricity consumption within the factory, the source of electricity should be identified; Renewable electricity should be accounted for separately, and relevant supporting documentation must be provided and explained in the report. If the relevant supporting documentation cannot be provided, all electricity will be considered as fossil energy electricity.
Electricity generated from fossil fuels within the plant should be included in the total amount of fossil energy according to section 5.4.1.
5.4.3 Total heat used for bio-natural gas production
The total heat used for producing bio-natural gas during the gas production stage, Qyr , when sourced externally, should be recorded based on data from heat meters or steam flow meters within the accounting boundary. This should be done in accordance with T/CAP ID 007 and calculated using formula (7):
Qyr = myr × (h _ 83.74) × 10_3 ······················································ (7)
where:
myr——The mass of steam, in tons of steam (t);
ℎ——The enthalpy value of steam per kilogram at the corresponding temperature and pressure should be referenced from relevant industry standards, in kilojoule per kilogram (kJ/kg);
83.74——The enthalpy value of water at 20 °C, in kilojoule per kilogram (kJ/kg);
10_3——Unit conversion factor, dimensionless.
The heat powered by renewable energy should be accounted for separately, and relevant supporting documentation must be provided and explained in the report. However, it should not be included in the total heat consumption for bio-natural gas production. If the relevant supporting documentation cannot be provided, all heat will be considered as fossil energy heat.
Heat generated from fossil fuels within the plant should be included in the total amount of fossil energy according to section 5.4.1.
5.5 The total energy of bio-natural gas supplied externally
The bio-natural gas measurement system should comply with the GB/T 18603. The standard reference conditions for measurement should be 101.325 kPa and 20 °C, with the lower heating value of dry natural gas.
The certification platform should monitor the total energy of bio-natural gas supplied externally Qjc , produced by the subject applying for certification. This should be done in accordance with JJF 1993—2022 and calculated using formula (8).
Qjc = ∑ V × Hjc × 10_3 ································································ (8)
where:
V——Monitoring the volume of bio-natural gas or biogas supplied externally, in cubic meters (m3);
Hjc——The lower heating value of bio-natural gas or biogas supplied externally at 20 °C and 101.325 kPa, in megajoule per cubic meter (MJ/m³).
The subject applying for certification should select the appropriate standards based on on-site monitoring conditions to measure or calculate the lower heating value of the bio- natural gas.
The determination of the lower heating value of bio-natural gas Hjc includes the following three methods:
a) When direct measurement conditions are available, the lower heating value of bio- natural gas should be calculated in accordance with GB/T 35211;
b) When indirect measurement conditions are available, the lower heating value of bio-natural gas should be calculated in accordance with GB/T 11062;
c) When neither condition is met on-site, the lower heating value of the bio-natural gas should be conservatively estimated based on the corresponding methane mole fraction. The values are provided in Table 1.
Table 1 Reference table for the heating value of biogas and bio-natural gas in relation
to the methane mole fraction
5.6 Sources of accounting data
5.6.1 Sequence of accounting data acquisition
The monitoring equipment shall meet the requirements of national standards, local standards and industry standards, and the instrumentation shall be properly calibrated on a regular basis to ensure the accuracy of the verification data. The data acquisition priorities for the accounting of Zero Carbon Energy Certificates are shown in Table 2:
Table 2 Data acquisition priority
5.6.2 Frequency of accounting data acquisition
The accounting data, except those monitored in real time by the certification platform, shall be acquired at the frequency specified in the monitoring plan of the subject of application for certification. The monitoring plan shall conform to the national and local laws as well as regulations, policies, standards.
6 Data quality management
The subject of application for certification shall reinforce the management of data quality in the Zero Carbon Energy Certificates, including, but not limited to:
a) Establish rules for the accounting and reporting of zero-carbon energy certificates for biomass thermal energy in enterprises, including the responsible organization and personnel, workflow and content, duty cycle and time nodes, etc.; a dedicated staff member is assigned to be responsible for the accounting and reporting of zero-carbon energy certificates in enterprises;
b) Classify the accounting data of zero carbon energy certificates according to their priority, with a l ist of the accounting data of zero carbon energy certificates of enterprises, which provides corresponding requirements for the acquisition of accounting data of different classes;
c) Evaluate the existing monitoring conditions in accordance with GB 17167 and NY/T 3239, to constantly improve their own monitoring capacities, and formulate corresponding monitoring plans to collect activity data; regularly maintain the measuring instruments, testing equipment and online monitoring instruments, with clear records;
d) Establish a comprehensive zero-carbon energy certificate data recording management system, including the management of information on data sources, data acquisition times, and relevant responsible persons.
e) Establish an internal review system for Zero Carbon Energy Certificate reports, regularly cross-check production activity data to identify potential risks of data errors and propose appropriate solutions.
7 Verification
7.1 Verification principles
7.1.1 Objective and independent
The verification organization shall maintain its independence from the certified project activity, remain objective throughout the verification activity without bias or conflict of interest.
7.1.2 Fair and just
The findings, conclusions and reports of the verification organization in its verification activities shall be true and accurate. The report shall include unresolved differences of opinion, in addition to significant obstacles during the certification.
7.1.3 Honest and trustworthy
The verification organization shall exercise a high degree of responsibility to ensure the integrity and confidentiality of the verification.
7.1.4 Professional
The verification organization shall possess the necessary professional skills for verification, able to exercise professional judgment in accordance with the importance of the task and the specific requirements of the client.
7.2 Verification Process
7.2.1 Verification process
The process of verification of zero carbon energy certificates carried out by the verification organization consists of three phases, as shown in Figure 2.
Figure 2 Verification process
7.2.2 Preparation
Upon receipt of the notification from the certification platform, the verification organization shall establish a verification team with professional skills in accordance with the project status, as well as the field of expertise and technical competence of the verifier, to prepare for the verification in advance.
7.2.3 Implementation of verification
The verification organization shall act in accordance with the corresponding certification standards and requirements and perform effective on-site visits after determination of the rationality of the materials to be verified, confirmation of the focus of the on-site visit and formulation of the on-site visit plan. The verification organization shall prepare a verification report based on the on-site findings and conduct a technical review to ensure that the verification report is truthful, objective and logically clear.
7.2.4 Reporting
After the technical review, the verification organization shall submit the verification report and other supporting relevant materials to the certification platform. The verification body shall keep all written and electronic documents in the verification process in a secure and confidential manner for at least 10 years.
7.3 Verification content
The verification organization shall conduct verification in accordance with the rules and relevant requirements of the certification platform, This includes confirming the uniqueness of the zero-carbon energy certificates for the project, assessing the reasonableness of the accounting results, verifying the configuration of production facilities and measurement equipment, verifying the operation of the monitoring system, and confirming the implementation of the monitoring plan, etc.
For the verification of bio-natural gas, the type and source of the raw materials should be clearly identified. The classification of raw materials can be referenced in Appendix B. If the materials are not listed in the appendix, it should be verified whether the raw materials are organic waste, and this should be explained in the report.
The total energy of bio-natural gas supplied externally should be cross-verified to ensure that the total energy of biogas before purification in the production system is greater than the total energy of the bio-natural gas supplied externally. Otherwise, the source of the issue should be investigated, and an explanation should be provided in the report. The total energy of biogas before purification should be considered as the total energy of the bio-natural gas supplied externally.
8 Certification
The certification of Zero Carbon Energy Certificates shall be conducted in accordance with T/CAP ID 006 and related regulations.
Annex A
(Informative)
Energy conversion and reference value
Due to the variety of non-electric renewable energy sources, the conversion between different energy sources should take reference to the relevant provisions of GB/T 2589- 2020, with the energy unit unified as gigajoule (GJ). If the energy is not in joules, it is converted to gigajoule by means of a standard coal quantity.
NOTE 1: 1 kgce = 29307.6 kJ = 0.0293076 GJ = 7000 kcal
NOTE 2: 1 kW ·h = 3600000 J = 0.0036 GJ
Table A.1 Standard coal conversion factors for energy sources (for reference)
Annex B
(Normative)
Main Types of Raw Materials for Biogas and Bio-Natural Gas
The main types of raw materials for biogas and bio-natural gas are listed in Table B.1.
Table B.1: Main Types of Raw Materials for Biogas and Bio-Natural Gas
Annex C
(Informative)
Specification for certification of bio-natural gas
Table C.1 Energy in the transportation of raw materials Qys
Table C.2 Total fossil energy used in the production of bio-natural gas Qhs
Table C.3 Total electricity powered by fossil energy used in the production of bio- natural gas Qyd
Table C.4 Total heat powered by fossil energy used in the production of bio-natural gas Qyr
Table C.5 Total fossil-sourced energy used in the production of bio-natural gas Qsc
Table C.6 Total energy of bio-natural gas supplied externally Qjc
Table C.7 Calculated zero-carbon energy amount Qzj
Bibliography
[1] GB/T 40506—2021 Terminology related to biomass
[2] RB/T 175—2018 Requirements for bioenergy sustainability certification
[3] Guidel ines on Greenhouse Gas Emiss ion Account ing Methodology and Reporting for Power Generat ion Enterpr ises in China (Trial) Cl imate Divis ion, NDRC General Office [2013] No. 2526
[4] Guidel ines for Ver ification of Enterpr ise Greenhouse Gas Emiss ion Reports (Trial) General Office of Ministry of Ecology and Environment, Cl imate Letter [2021] No. 130
[5] Guidel ines on Account ing and Report ing of Greenhouse Gas Emissions for Enterprises Power Generat ion Faci lit ies General Office of Ministry of Ecology and Environment, Cl imate Letter [2022] No. 485
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