Key Laboratory of Advanced Energy and Power,Institute of Engineering Thermophysics (IET),Chinese Academy of Sciences(CAS)
University of Chinese Academy of Sciences
Jiangsu Zhongke Research Center for Clean Energy and Power

耦合可再生能源生产的绿电为煤气化反应供热以消除燃烧供热实现自热平衡的影响,不仅可有效降低气化过程CO2排放量,还能提高合成气氢碳比(H/C),从而降低以煤气化为源头生产化学品的水煤气变换工段中CO2排放。对不同类型的常规气化反应器和相应的耦合绿电反应器进行建模与模拟,判明合成气组分的主要影响因素,分析了温度对合成气组分的影响,探讨合成气H/C随温度变化规律,并计算不同化学品生产过程的CO2减排潜力。结果表明,耦合绿电的气化反应器合成气中CO2排放较常规气化反应器分别减少了12.63%(固定床)、11.01%(气流床)、9.23%(输运床)和5.12%(流化床),且H/C呈上升趋势;温度对合成气组分影响较大,热解解耦和气化反应的反应器一定程度上影响合成气组分;温度低于1500K时,H/C随温度升高而降低;温度高于1500K时,H/C随温度升高而缓慢升高;耦合绿电煤基化学品生产过程CO2排放大幅减少,操作在更低温度和压力的气化反应器具有更高的合成气H/C和CO2减排潜力;耦合绿电的固定床系统效率优势明显;考虑到耦合绿电的高温反应器存在的技术困难,耦合绿电的固定床、流化床和输运床反应器更具可行性。

For the processes to produce coal-based chemicals using coal gasification processes,combining with green electricity is an effective method to achieve CO2 emission reduction because not only the CO2 emissions caused by combustion of coal to provide needed heatin gasifiers can be eliminated but also the higher hydrogen to carbon ratio (H/ C) of synthesis gas can be obtained and the CO2 emissionsin water-gas-shift unit can be reduced. The models of different conventional gasifiers were simulated and verified, and the corresponding green electric heating gasifiers were simulated. The trends on the composition of the gaseous products and the H/ C of the syngas weresimulated, and the influences on the products by temperature, sorts of coals, and sequence of reactor models were analyzed. Furthermore,the trends of H/ C with temperature are investigated and the potential of CO2 emission reduction are calculated. It is found that the CO2emissions of the reactors combining with green electricity decrease by 12.63% ( fixed bed), 11. 01% ( entrained flow bed), 9. 23%(transport bed) and 5.12% (fluidized bed), respectively. Besides, the H/ C shows an upward trend. Temperature has a significant impacton the composition of syngas, and the reactors for decoupling pyrolysis and gasification reactions to some extent affect the composition ofsyngas. When the temperature is below 1 500 K, the H/ C decreases with the increase of temperature. When the temperature is above1 500 K, the hydrogen to carbon ratio slowly increases with the increase of temperature. Decoupling pyrolysis and operating under lowerpressure can help to achieve a higher H/ C and lower CO2 emission, and the gasifiers operating under more moderate conditions have morepotential of CO2 emission reduction. The efficiency advantage of the fixed bed coupling with green electricity is obvious. Considering thetechnical difficulties of high-temperature reactors coupled with green electricity, fixed bed, fluidized bed, and transport bed reactors coupled with green electricity are more feasible.

国家重点研发计划资助项目(2019YFE0100100)

孙益,郭啸晋,徐祥.耦合绿电煤气化生产化学品过程CO2减排潜力[J].洁净煤技术,2024,30(4):111-119.

SUN Yi,GUO Xiaojin,XU Xiang.Potential of CO2 emission reduction of coal gasification combined with green electricity[J].Clean Coal Technology,2024,30(4):111-119.