| Popis: |
The evaluation and matching of CCUS source and sink potential of various geological bodies in Huainan coalfield is of great significance to the engineering popularization of CO2–ECBM technology. In this study, various types of geological bodies, such as deep unworkable coal seam, residual coal body and goaf area, in Huainan coalfield were taken as the research object. Firstly, the evaluation methods of CO2 geologic storage potential of various geologic bodies were discussed. Secondly, the CO2 storage potential of various geologic bodies was analyzed. Then, based on the lowest cost objective function and improved mileage saving method, the source and sink matching research of CO2 geological storage was carried out, and the pipe network design was optimized. Finally, based on the three-step thinking, the design idea of CCS source and sink network planning was proposed. The results show that the total annual CO2 emissions of coal-fired power plants are 58.8 million tons. The total CO2 geological storage potential in deep non-mining coal seam, residual coal and goaf area is 762 million tons, 5.17 million tons and 82.46 million tons, respectively, which can store CO2 for 12.97 years, 0.088 years and 1.40 years, respectively. Within the 10-year cycle, the deep unworkable coal seam can store 587.6 million tons of CO2, and the cumulative planned pipeline is 217.0 960 km with requiring a cumulative capital of 3.73×1010 $. Within the 1.45-year cycle, production mines and closed mines can store 85.2 million tons of CO2, and the cumulative planned pipeline is 464.516 1 km with requiring a cumulative capital of 7.36×109 $. Based on the improved mileage saving method, CCS source and sink matching each geological storage junction saved 266.612 7 km and 1.121×109 $, accounting for 57.40% and 79.95% of the total mileage and total cost of pipeline transportation, respectively. Based on the three-step approach, the whole line of CO2 emission sources and CO2 storage sinks in Huainan coal field can be completed by stages and regions, and all CO2 transportation and geological storage can be realized. |
