整体煤气化燃料电池发电与甲醇联产系统运行特性

Design and operation characteristics study of integrated coal gasification fuel cell power generation and methanol cogeneration system

基于实际煤化工系统,开展煤气化化工与固体氧化物燃料电池、燃气透平耦合技术研究是加快IGFC工程化及商业化发展的新思路。选取山东能源集团旗下内蒙古荣信化工多喷嘴对置式水煤浆气化生产甲醇系统,借助化工流程分析软件Aspen Plus开展煤气化化工与固体氧化物燃料电池、透平工艺流程构建,通过仿真计算研究运行参数对整体煤气化燃料电池发电与甲醇联产(IGFC-CMP)系统的影响,并对典型条件下系统化工品产出、电力和热力出力进行分析。在此基础上分析气化炉关键参数对各关键部件出力、效率及其他运行参数的影响。结果表明,甲醇生产装置联合燃料电池发电,使系统整体效率由57.71%提高至59.22%,说明新系统在能源利用效率方面具有优越性。水煤浆浓度由55%提升至60%时,对燃料电池功率和效率影响最大,对整体效率提升较小。燃料电池效率由42.46%提升至68.42%,功率由2.65 MW提升至4.22 MW,透平1功率由6.23 MW提升至6.56 MW。抽气占比由0提升至51.59%时,由于抽气量相对合成气总量不到2%,因此对甲醇产量影响较小,整体效率由59.20%提升至60.70%。通过抽取部分净化气实现“化工品-热-电”供给调节可行,建议通过设置并联备用机组实现发电机组扩容,以减少运行调控难度及维持燃料电池高效率。通过对原甲醇生产系统的优化设计,不仅提高了系统整体能效,也实现了从单一输出化工品、余热到“化工品-热-电”联供的转变,为缓解化工系统生产用电压力,优化产品多样性和经济性提供新思路。

Based on the actual coal chemical system,the research on the coupling technology of coal gasification chemical industry,solid oxide fuel cell and gas turbine is a new idea to accelerate the engineering and commercial development of IGFC.The Inner Mongolia Rongxin Chemical multi-nozzle opposed coal water slurry gasification and methanol production system of Shandong Energy Group Co.,Ltd.was designed to carry out the construction of coal gasification chemical engineering,solid oxide fuel cell,and turbine process flows by Aspen Plus,a chemical process analysis software.The effects of operating parameters on the integrated coal gasification fuel cell power generation and methanol co-generation(IGFC-PMC)system were studied by simulation calculation,and the chemical output,power and thermal output of the system under typical conditions were analyzed.On this basis,the influences of key parameters of gasifier on output,efficiency and other operating parameters of key components were analyzed.The results show that the methanol production unit combined with fuel cells can improve the overall efficiency of the system from 57.71%to 59.22%,indicating that the new system has advantages in energy utilization efficiency.When the concentration of coal water slurry increases from 55%to 60%,there is the greatest influence on the power and efficiency of fuel cells and little improvement on the overall efficiency.The efficiency of fuel cell increases from 42.46%to 68.42%,the power increases from 2.65 MW to 4.22 MW,and the power of turbine 1st increases from 6.23 MW to 6.56 MW.When the proportion of pumping gas increases from 0 to 51.59%,the impact on methanol production is small because the pumping volume is less than 2%relative to the total amount of syngas.In addition,the overall efficiency increases from 59.20%to 60.70%.It is feasible to adjust the supply of"chemicals,heat and electricity"by extracting part of the purified gas.It is suggested to expand the generator set by setting parallel standby units,so as to reduce the difficulty of operation regulation and maintain the high efficiency of fuel cells.The optimized design of the original methanol production system not only improves the overall energy efficiency of the system,but also realizes the transformation from a single output chemical and waste heat to the combined supply of chemical,heat and electricity,providing a new idea for chemical system to relieve the pressure of production electricity and product diversity and economic optimization.