Construction of Model for Carbon Emissions and Analysis of Quantitative Characteristics for Whole Life Cycle of Railway Tunnel Engineering
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摘要:
为准确评估铁路隧道工程全生命周期碳排放特征、支持专项分析与减排策略研究,针对铁路隧道施工工艺复杂、工序差异显著的特点,构建了涵盖工程物化阶段和运营维护阶段的碳排放核算模型,并结合分工序定额法与分材料碳因子法在某案例中进行碳排放量化核算与差异分析,进一步采用帕累托分析法识别高排放环节与关键影响因素,实现碳排放分解与分级管理. 结果表明:该案例隧道工程全生命周期碳排放为
68.1075 × 104 tCO2e,其中工程物化阶段产生碳排放59.4040 × 104 tCO2e(占比87.2%),运营维护阶段碳排放8.7035 × 104 tCO2e(占比12.8%);在工程物化阶段中,材料生产及现场施工过程贡献了高达95.76%的碳排放,其中钻爆段施工碳排放强度为13843 tCO2e/km,盾构段施工碳排放强度为钻爆段施工的39.8%;在运营维护阶段,通风系统、防水排水和钢筋混凝土预制管维护占据73.54%的碳排放;全生命周期中A类碳排材料包括普通水泥42.5级(高性能混凝土)、普通水泥42.5级和带肋钢筋等,A类碳排机械包括轴流通风机、轨道式内燃机车和自卸汽车等;A类碳排工序包括盾构段衬砌、钻爆段支护和盾构段支护等.Abstract:Given the complex construction processes and significant procedural variations in railway tunnels, a model for accounting carbon emissions covering the engineering materialization phase and the operation and maintenance phase was established to accurately assess carbon emission characteristics throughout the whole life cycle of railway tunnel engineering and support specialized analysis and emission reduction strategies. Combined with the unit rate method by procedure and the carbon factor method by material, quantitative accounting and variance analysis of carbon emissions were conducted in a case study. Furthermore, Pareto analysis was employed to identify high-emission sectors and key influencing factors, realizing the decomposition and hierarchical management of carbon emissions. The results indicate that the total carbon emissions during the whole life cycle of the case tunnel engineering are 68.107 5 × 104 tCO2e, with the engineering materialization phase generating 59.404 0 × 104 tCO2e (accounting for 87.2%) and the operation and maintenance phase generating 8.703 5 × 104 tCO2e (accounting for 12.8%). During the engineering materialization phase, material production and on-site construction processes contribute up to 95.76% of the carbon emissions, among which the carbon emission intensity of drill-and-blast section construction is 13 843 tCO2e/km, and that of shield section construction is 39.8% of the former. During the operation and maintenance phase, the maintenance of ventilation systems, waterproofing and drainage systems, and reinforced concrete precast pipes accounts for 73.54% of the carbon emissions. In the whole life cycle, Class A carbon-emitting materials include ordinary cement 42.5 grade (high-performance concrete), ordinary cement 42.5 grade, and ribbed steel bars; Class A carbon-emitting machinery includes axial flow fans, rail-type internal combustion locomotives, and dump trucks; Class A carbon-emitting processes include the lining of shield section, the support of drill-and-blast section, and the support of shield section.
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表 1 案例工程分阶段碳排放量
Table 1. Carbon emissions of case project by stage
阶段 项目 碳排放/(×104 tCO2e) 工程物化 材料生产 51.1046 材料运输 2.5193 现场施工 5.7801 运营维护 运营阶段 3.6536 维护阶段 5.0591 绿地碳汇 - 0.0092 生命周期 68.1075 表 2 不同阶段直接/间接碳排放情况
Table 2. Direct/indirect carbon emissions at different stages
直接/间接
排放工程物化阶段/
(×104 tCO2e)运营维护阶段/
(×104 tCO2e)生命周期/
(×104 tCO2e)直接碳排放 2.7920 0.4269 3.2189 电力间接碳排放 2.9702 4.1472 7.1174 其他间接碳排放 53.6418 4.1293 57.7711 总排放 59.4040 8.7035 68.1075 表 3 分部工程人材机电碳排放核算结果
Table 3. Accounting results of carbon emissions from labor, materials, machinery, and electricity in sub-projects
×104 tCO2e 隧道施
工工序人工碳
排放材料碳
排放机械碳
排放电力碳
排放占比/
%正洞盾构段 0.0966 30.5738 3.9086 0.2265 61.2 正洞钻爆段 0.0484 17.2096 0.9489 0.0346 32.0 明洞 0.0019 0.3622 0.0190 0.0004 0.7 洞门 0.0002 0.0578 0.0025 0.0000 0.1 辅助坑道 0.0163 2.9013 0.4607 0.0156 6.0 表 4 正洞钻爆段与盾构段碳排放强度对比
Table 4. Comparison of carbon emission intensity between drill-and-blast section and shield section in main tunnel
tCO2e/km 项目 按阶段 按排放源 合计 材料
生产材料
运输现场
施工直接
排放电力间
接排放其他间
接排放正洞钻
爆段12310 575 958 824 135 12884 13843 正洞盾
构段4600 223 687 277 410 4823 5510 表 5 运营阶段碳排放核算结果
Table 5. Accounting results of carbon emissions in operation phase
系统 项目 总功率/
kW运行时间/
(×105 h)碳排放/
(×105 tCO2e)通风系统 518.000 2.92 2.3339 照明系统 左线LED 47.450 8.76 0.6414 右线LED 47.425 8.76 0.6410 火灾消防
系统火灾报警
控制器
(联动型)1.200 8.76 0.0162 光纤光栅
处理器0.864 8.76 0.0117 监控计算器 0.700 8.76 0.0095 表 6 维护阶段碳排放核算结果
Table 6. Accounting results of carbon emissions in maintenance phase
×104 tCO2e 项目 直接
碳排放电力间接
碳排放其他间接
碳排放通风设施更换 0.011 0.314 0.034 高压线管 0.012 0.179 0.058 防水排水 0.008 0 1.306 明洞 0.017 0.004 0.362 中心水沟沟槽 0 0 0 钢筋混凝土
预制管0.379 0 2.374 合计 0.4281 0.4971 4.1339 表 7 前15种材料碳排放因子DQI值
Table 7. DQI values of carbon emission factors for top 15 materials
材料种类 可靠
性完整
性时间
范围地理
范围技术
范围普通水泥 42.5 级
(高性能混凝土)1 1 1 1 1 普通水泥 42.5 级 2 2 2 1 1 带肋钢筋(HRB400)φ18-25 1 1 1 1 2 水泥 32.5 级 1 1 2 2 1 EVA防水板 δ= 1.5 1 2 1 1 2 耐寒型输送带 ST2000/1200mm 1 1 1 1 1 钢筋混凝土管 承插口 d600 2 1 1 2 1 光圆钢筋(HPB300)φ<10 2 1 2 1 2 光圆钢筋(HPB300)φ>=10 1 2 2 1 2 定型钢模板 1 2 1 1 1 无缝钢管 D108*6 1 1 1 1 1 带肋钢筋(HRB500)φ18-25 2 2 2 2 1 工字钢 Q235-A 1 2 1 1 1 型钢 2 1 1 1 2 聚羧酸系减水剂 1 1 2 1 1 -
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