污泥水分含量对其空气气化特性的影响(英文)

利用外热式下吸固定床气化实验装置,研究了在一定的空气流量(0.05 m3/h)、气化温度(800℃)下污泥水分含量对3种不同性质污泥空气气化特性的影响。结果表明,气化气中CO2、CH4和H2含量、气化气热值以及水相生成量均随污泥水分含量的增加而增加,而CO含量和焦油生成量呈降低趋势。污泥厌氧消化使气化气中CO、CH4、H2、CmHn含量以及气化气品质降低;而污水处理工艺中的厌氧过程可改善气化气品质,其中来自A2/O工艺消化污泥的气化气品质高于普通活性污泥法消化污泥的气化气品质。随着污泥水分含量的增加,2种不同污水处理工艺产生的消化污泥气化气中CO、CO2和H2含量的差距逐渐加大,来自于同一A2/O工艺的消化与未消化污泥气化气中H2和CO2含量的差距亦逐渐加大,而消化与未消化污泥气化气中CO含量的差距则逐渐接近。

Effect of moisture content in sewage sludge on air gasification

The properties of gasification for three kinds of sewage sludges with different moisture contents are studied in an external heated downdraft reactor under a stable air flux of 0.05m3/h and a constant gasification temperature of 800℃. The results show that the contents of CO2, CH4 and H2 in gas, lower heating value (LHV) of gas and aqueous yield increase with increasing moisture content, while content of CO and tar yield decrease. Sludge anaerobic digestion process increases the contents of CO, CH4, H2 and CmHn in gas and reduces the quality of gas. The anaerobic process in wastewater treatment can improve the quality of gas. The quality of gas produced by gasification of anaerobic digestion sludge from A2/O process is higher than that from activated sludge process. With increasing moisture content in sludge, the difference in the contents of CO, CO2 and H2 in the gas produced by both anaerobic digestion sludge gasification is gradually increased, and the difference in the contents of CO2 and H2 produced by the gasification of digested and undigested sludges from the same A2/O process is also increased, while the difference in CO content is gradually reduced.