页岩气压裂返排液的分析与双效MVR处理  

Analysis and double-effect MVR treatment of shale gas fracturing flow-back fluid

作　　者：王远[1] 孙兆鹏[1] 李永胜[1] 姜杰[1] 肖泽仪[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《化工环保》2016年第5期511-517,共7页Environmental Protection of Chemical Industry

基　　金：国家科技支撑计划项目(2013BAC12B01);四川大学德阳校市科技合作专项(HZYF201513)

摘　　要：对西南地区某页岩气田压裂返排液进行了分析,在此基础上采用双效机械蒸汽再压缩(MVR)系统对其进行处理,建立了完整的计算模型,并对影响系统的主要参数进行了探讨。压裂返排液分析结果表明:蒸发浓缩液黏度与相同浓度氯化钠溶液的黏度相近,可排除因有机物富集导致其在蒸发器内壁附着而影响传热系数及堵塞蒸发器的可能。模型计算结果表明:进料含盐率由2%增至6%时,压缩机比功耗与压缩机进气量的降幅均小于4.0%,两效蒸发器面积分别减小约4.3%和18.5%;传热温差由4℃升至8℃时,压缩机比功耗增加约51.0%,两效蒸发器面积均减小约49.6%;在系统安全运行的前提下,提高蒸发温度可降低系统能耗。Based on analysis of fracturing flow back fluid from a shale gas field in southwest region, a double-effect mechanical vapor recompression （MVR） system was used to treat the flow-back fluid. A complete mathematical model was developed and the main parameters affecting the system were calculated. The analysis results show that the dynamic viscosity of the concentrated fluid is closed to that of sodium chloride solution with same concentration, and the possibility that the concentrated fluid may adhere to the inner wall of evaporator or even block the evaporator due to organics accumulation can be ruled out. The calculation results show that： As the salt content of the feed increases from 2% to 6%, the specific power consumption and the air input of compressor both decrease less than 4.0%, and the first and the second effect evaporator heat transfer areas are reduced about 4.3% and 18.5% respectively; When the heat transfer temperature difference rises from 4 % to 8 ~C, the specific power consumption increases about 51.0%, and both of the two effect heat transfer areas are reduced approximately 49.6% ; On the premise of assuring the safe operation, a higher evaporation temperature is recommended in order to reduce power consumption.

关 键 词：压裂返排液 页岩气 机械蒸汽再压缩 蒸发结晶 热力学模型 

分 类 号：X741[环境科学与工程—环境工程]