LIUXing,LIXu-fang,YUBo,et al.Carbon Emissions Calculation and Carbon Emission Reduction Strategy of Two-stage Drying + Pyrolysis and Gasification Process[J].China Water & Wastewater,2025,41(24):44-51.
两段式干化+热解气化工艺碳排放核算及碳减排策略
- Title:
- Carbon Emissions Calculation and Carbon Emission Reduction Strategy of Two-stage Drying + Pyrolysis and Gasification Process
- Keywords:
- carbon emission calculation; carbon emission reduction; sludge treatment and disposal; pyrolysis and gasification; municipal sludge
- 摘要:
- 污泥处理处置过程会产生大量碳排放，不同的污泥处理处置工艺路线产生的碳排放量有一定的差异。热解气化作为一种新兴的污泥处理处置技术，目前缺乏相关的碳排放核算研究。以某市政污泥处理处置项目为例，利用实际运行数据核算两段式干化+热解气化工艺各环节碳排放量，并分析其主要碳排放来源。试运行期间，该工艺总碳排放量为20 851 tCO2/a，处理单位干基污泥（DS）产生的碳排放量平均为1.732 tCO2/tDS，干化阶段碳排放量占总碳排放量的78.9%，尾渣资源化利用产生的碳补偿量为0.162 tCO2/tDS。两段式干化+热解气化工艺碳排放水平优于目前国内主流的污泥处理处置方式，并具有较高的碳补偿量。结合项目实际情况，提出优化干化系统效率、采用光伏发电和低温脱硝工艺3种碳减排措施，可降低0.396 tCO2/tDS的碳排放。
- Abstract:
- The sludge treatment and disposal process generates significant carbon emissions, with varying levels of emissions depending on the treatment methods used. As a new sludge treatment technology, research on the carbon emission accounting for pyrolysis+gasification process is limited. The carbon emissions of each link of the two-stage drying + pyrolysis and gasification process was calculated by using actual operation data from a municipal sludge treatment and disposal project, and the main source of carbon emissions was analyzed. During the trial operation of the case project, the total carbon emission for the sludge treatment and disposal process was 20 851 tCO2/a, and the average carbon emission per unit dry sludge was 1.732 tCO2/tDS, with the carbon emissions of drying stage accounting for 78.9% of the total carbon emissions, and the carbon compensation from the utilization of tailings was 0.162 tCO2/tDS. The carbon emission level of the two-stage drying + pyrolysis and gasification process was more favorable than the current mainstream sludge treatment and disposal methods in China, with a higher carbon compensation rate. Based on the actual project situation, three carbon emission reduction measures were proposed, including the optimization of the drying system efficiency, adopting photovoltaic power generation, and implementing the low-temperature denitration of flue gas. These measures can reduce the carbon emissions by 0.396 tCO2/tDS.
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