【摘要】 为解决现有沼气提纯工艺在H₂S含量高时所遇到的问题,通过Aspen Plus软件模拟高压水洗提纯沼气工艺,并提出增加解吸空气流量和加热液相两种方式强化过程。结果表明,基于现有工艺,当沼气中H₂S摩尔分数高于3.689×10^-3时,生物甲烷中H₂S摩尔分数不能满足作为车用燃料不高于9.3×10^-6（摩尔分数）的要求。当沼气中H₂S摩尔分数从3.689×10^-3升高至5×10^-3时,增加解吸空气的流量不影响设备改造成本,但运营成本增加3 339元/a。而加热液相的强化方式则由于引入了新的换热设备,导致设备投资成本和运营成本的双重增加,其中设备改造成本为11.33万元;改造后运营成本增加6 258元/a。相比之下,在老厂改造的操作型计算中,采取增加空气流量是相对较好的选择。更多还原

【Abstract】 In order to solve the problem encountered in the biogas upgrading with high H₂S content, Aspen Plus software was used to simulate biogas upgrading with high pressure water scrubbing, and increasing the air flow and heating the liquid phase were proposed as two strategies to achieve process intensification. Results showed that when the mole fraction of H₂S in the raw biogas was higher than 3.689×10^-3, the outlet H₂S content couldn’t meet the requirement(9.3×10^-6, mole fraction) of biomathane used for vehicle fuels under the current operating conditions. When the H₂S mole fraction in the raw biogas was higher than 3.689×10^-3 and up to 5×10^-3, the option of increasing the desorption air flow would lead to an increased operation and maintance cost(C_O&MC) by 3 339 CNY/a, while the option of heating the liquid resulted in an additional cost for equipment modification with a value of 113 300 CNY and at the same time with an increased C_O&MC by 6 258 CNY/a. Therefore, increasing the air flow is a better strategy for the retrofit of an old plant.更多还原