摘要
随着厌氧消化技术在湿垃圾处置项目中日趋成熟,厌氧生化反应产生沼气的资源化利用成为湿垃圾资源化最重要的途径.对厌氧沼气提纯制生物天然气、热电联产、直燃供热和制备氢气等 4 种利用技术的原理、流程和特点进行总结.结合 4 个典型工程案例的数据,以沼气利用规模 3 000 m3/h为基准,建立经济模型并进行成本和效益分析.4 个典型案例综合效益排序为沼气热电联产(有电价补贴)>沼气提纯制天然气>沼气热电联产(无电价补贴)>沼气直燃供热.湿垃圾项目沼气资源化利用方案的最终选择应充分考虑项目规模、选址边界条件、投资、电力和蒸汽成本、产品市场消纳及价格、综合经济效益等多种因素.研究结果表明,产品价格是影响沼气资源化利用方案综合效益的最核心因素.当天然气销售价格超过 2.28/2.68 元/m3(在有园区协同廉价供电和供热的条件下)或蒸汽销售价格超过 191.50/229.30 元/t时,对应的沼气利用方案综合效益高于无/有上网电价补贴的热电联产方案.
Abstract
With the maturation of anaerobic digestion technology in the treatment of wet waste projects,the resource utilization of anaerobic biogas has become a significant method for the resource recovery of wet waste.The principles,processes and characteristics of four utilization technologies for anaerobic biogas were summarized,including biogas purification for natural gas production,biogas cogeneration,direct combustion of biogas for heating,and hydrogen production.Based on the data from four typical engineering cases,an economic model was established for cost and benefit analysis with the biogas utilization scale of 3 000 m3/h.The comprehensive benefit ranking of the four typical cases was biogas cogeneration(with electricity price subsidies)>biogas purification for natural gas production>biogas cogeneration(without electricity price subsidies)>direct combustion of biogas for heating.The final selection of the biogas resource utilization schemes for wet waste projects should fully consider various factors such as the scale of the wet waste project,site boundary conditions,project investment,electricity and steam costs,product market consumption and prices,and comprehensive economic benefits.The research results indicated that the product price was the most critical factor affecting the comprehensive benefits of biogas resource utilization schemes.When the sales price of natural gas exceeded 2.28/2.68 yuan/m3(under the conditions of collaborative low-cost power and heating in the park)or the sales price of steam exceeded 191.50/229.30 yuan/t,the comprehensive benefits of the corresponding biogas utilization scheme were higher than those of the cogeneration scheme without/with grid electricity price subsidies.
维普
万方数据