己内酰胺废液制水煤浆对气化工艺的影响  

Effect of caprolactam waste liquid on coal water slurry gasification process

作　　者：张洲 何哲超 宋星星 叶莲祥 孙逢玖 汤冰 ZHANG Zhou;HE Zhechao;SONG Xingxing;YE Lianxiang;SUN Fengjiu;TANG Bing(Caprolactam Department of SINOPEC Hunan Petrochemical Co.,Ltd.,Yueyang 414014)

机构地区：[1]中石化湖南石油化工有限公司新区己内酰胺部,湖南岳阳414014

出　　处：《合成纤维工业》2024年第6期92-96,共5页China Synthetic Fiber Industry

基　　金：中国石化股份有限公司科研计划(421099-5)。

摘　　要：将混配煤、己内酰胺废液、新鲜水、添加剂木质磺酸钠按一定比例加入磨煤机制得水煤浆,再泵入SE水煤浆水冷壁气化工艺气化炉进行气化反应,考察了废液制水煤浆的性质,废液对水煤浆气化工艺、气化废水的影响,并分析了废液制水煤浆的经济环保性。结果表明:与新鲜水制水煤浆相比,完全废液制水煤浆的浓度由60.4%提升至61.3%,黏度由750 mPa·s降至652 mPa·s,灰熔点由1380℃下降至1270℃,仍然满足入炉煤浆质量指标要求;完全废液制水煤浆气化反应的合成气量由265570 Nm^(3)/h涨至280212 Nm^(3)/h,有效气体积分数由76.9%上涨至77.4%,硫化氢体积分数由0.14%上涨至0.19%,且气化工艺参数无明显变化;完全废液制水煤浆气化反应后渣水处理单元外排废水的化学需氧量(COD)及氨氮含量增大,COD由324.2 mg/L上升至515.5 mg/L,氨氮含量由144.23 mg/L上升至179.9 mg/L;采用己内酰胺废液完全替代新鲜水制水煤浆可节约大量新鲜水,减少石灰石、原煤等消耗,且系统己内酰胺废液COD脱除率为99.35%,磨煤机附近大气中苯含量远小于3 mg/kg的控制指标。The mixed coal,caprolactam waste liquid,fresh water and additive sodium lignosulfonate were added to the coal mill in a certain proportion to obtain coal water slurry,which was then subjected to gasification reaction after pumping into a gasifier for coal water slurry water cooled wall gasification process.The properties of coal water slurry produced from waste liquid were investigated,as was the impact of the waste liquid on the coal water slurry gasification process and gasification waste water.And the economic and environmental protection of coal water slurry production from waste liquid was also analyzed.The results showed that compared with fresh water to coal water slurry,the concentration of coal water slurry from completely waste liquid increased from 60.4%to 61.3%,the viscosity decreased from 750 mPa·s to 652 mPa·s,and the ash melting point decreased from 1380℃to 1270℃,still meeting the quality requirements for coal slurry entering the furnace;the synthesis gas volume of the complete waste liquid to coal water slurry gasification reaction increased from 265570 Nm^(3)/h to 280212 Nm^(3)/h,the effective gas volume fraction increased from 76.9%to 77.4%,and the hydrogen sulfide volume fraction increased from 0.14%to 0.19%,and there was no significant change in the gasification process parameters;the chemical oxygen demand(COD)and ammonia nitrogen content of the wastewater discharged from the slag water treatment unit for the complete waste liquid to coal slurry gasification reaction increased,with COD rising from^(3)24.2 mg/L to 515.5 mg/L and ammonia nitrogen content rising from 144.23 mg/L to 179.9 mg/L;and the use of caprolactam waste liquid to completely replace fresh water in the production of coal water slurry could save a large amount of fresh water,reduce the consumption of limestone,raw coal,etc.,the COD removal rate of caprolactam waste liquid in the system was 99.35%,and the content of benzene in the atmosphere near the coal mill was far less than the control index of 3 mg/kg.

关 键 词：己内酰胺废液 水煤浆 黏度 浓度 气化工艺 

分 类 号：TQ340.9[化学工程—化纤工业]