PTA废水厌氧处理所产沼气发电利用工程

Biogas Power Generation from Anaerobic Treatment of PTA Wastewater

应用升流式厌氧过滤器（AF）工艺处理VIA废水，在正常生产条件下（处理负荷为50tCOD／d），AF厌氧反应器可产沼气18000m^3／d，沼气中CH4体积分数达到64．5％～70．7％，沼气发热量为22．2-28．1MJ／m2，H2S质量浓度达到5000～6500mg／m3。沼气发电工艺主要由沼气预处理系统、沼气发电系统等组成，发电量可达1000kW·h，低压蒸汽产量可达4800t／a。

Upflow anaerobic filter （AF anaerobic reactor） is used to treat purified terephthalic acid （PTA） wastewater. Under the normal production conditions with COD load of 50 t/d, AF anaerobic reactor can produce biogas of 18 000 m3/d, with the methane （CH4） volume fraction of 64.5% to 70.7% , the calorific value of 22.2 to 28.1 MJ/m3, and hydrogen sulfide （HzS） mass concentration of 5 000 to 6 500 mg/m3. Biogas power generation process is mainly composed of pretreatment system, and power generation system and waste heat recovery system. The annual generation capacity is up to 1 000 kW·h, with an annual low pressure steam output of 4 800 t.