含油污泥高温热解工艺参数优化及产物分析

Parameter optimization and product analysis of high temperature pyrolysis of oily sludge

关键词:  大庆油田  含油污泥  高温热解  催化剂  工艺参数

Key words:  Daqing oilfield  oily sludge  high temperature pyrolysis  catalyst  process parameter

摘要:

为了进一步处理大庆油田离心后的含油污泥,使其达到国家农用污泥污染物控制标准的要求,采用真空管式热解炉对离心后的含油污泥进行了高温热解实验,考察了热解终温、热解时间、升温速率和催化剂对热解残渣含油率的影响,优选出了最佳的工艺参数,并对热解产物进行了分析。结果 表明,在催化剂加量为1.5%(w)、热解终温为550 ℃、热解时间为2 h、升温速率为10 ℃/min的条件下,可将大庆油田离心后的含油污泥热解残渣含油率降低至0.3%(w)以下。催化剂的加入不仅提高了热解效率,还改善了热解油相的品质,降低了热解残渣的发热量,并且热解残渣的重金属含量、油含量以及其他污染物含量均可满足标准要求,可以作为B级农用污泥进行使用,达到了含油污泥资源化和无害化处理的目的。 

Abstract:

Aiming at further disposal of the centrifugal oily sludge from Daqing oilfield to meet the requirements of the national agricultural sludge pollutant control standard, the high temperature pyrolysis experiment of the centrifugal oily sludge was carried out in a vacuum tube pyrolysis furnace. The effects of the final pyrolysis temperature, pyrolysis time, heating rate and catalyst on the oil content of the pyrolysis residue were investigated, the optimal process parameters were optimized and the pyrolysis products were analyzed. The results show that:under the conditions of catalyst dosage of 1.5%, final pyrolysis temperature of 550 ℃, pyrolysis time of 2 h and heating rate of 10 ℃/min, the oil content of pyrolysis residue of oily sludge centrifuged from Daqing oilfield could be reduced to less than 0.3%. The addition of catalyst improved the pyrolysis efficiency and the quality of pyrolysis oil phase, and reduced the calorific value of pyrolysis residue. Moreover, the heavy metal content, oil content and other pollutants concentration of the pyrolysis residue could meet the standard requirements to be used as grade B agricultural sludge, achieving the purpose of resource utilization and harmless treatment of oily sludge.