电厂尿素高效水解技术
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摘要
国电青山热电有限公司3台锅炉的脱硝氨气制备方式为尿素水解反应,通过8年来的运行数据比对分析,尿素水解主要是与温度、水解方式有关CO(NH2)2+H2O=NH2CO2NH4,NH2CO2NH4=2NH3+CO2。因此,一套安全可靠的尿素高效水解系统,对机组安全运行、环保生产都很重要。本文以青山热电公司为例,每台脱硝装置配套水解器出力为155kg/h,脱硝使用尿素约5000t/a,其中排污量浪费尿素约400t/a,按照运行5000t/a,尿素2200元/t计算,直接经济损失约88万元,同时也会造成环境污染。青山热电公司研发优化水解器,使得尿素水解平衡向正反应进行,尿素水解转化率保持在98%以上,节约尿素,创造经济价值,且解决了水解器废液对环境的二次污染问题。
The preparation method of denitrifying ammonia gas in three boilers of Guodian Qingshan Thermal Power Co.,Ltd. is urea hydrolysis reaction. Through the comparison and analysis of operation data in the past 8 years, urea hydrolysis is mainly related to temperature and hydrolysis mode, CO(NH2)2+ H2 O=NH2 CO2 NH4,NH2 CO2 NH4=2 NH3+CO2. Therefore,a set of safe and reliable urea efficient hydrolysis system is very important for units' operation and environmental protection. Take our plant as an example,the output of each denitrification unit is 155 kg/h,and the annual use of urea in our plant is about 5000 t,in which the waste of urea is about 400 t. According to the annual operation of 5000 hours,calculated by 2200 Yuan per ton of urea,the direct economic loss is about 880,000 Yuan. At the same time,it will also cause the environmental pollution. Our plant develops and optimizes the hydrolyzer to make the equilibrium reaction of urea hydrolysis proceed positively,the conversion rate of urea hydrolysis is kept above 98%,the urea is saved,the economic value is created,and also the secondary pollution problem of hydrolyzer waste liquid to the environment is solved.
The preparation method of denitrifying ammonia gas in three boilers of Guodian Qingshan Thermal Power Co.,Ltd. is urea hydrolysis reaction. Through the comparison and analysis of operation data in the past 8 years, urea hydrolysis is mainly related to temperature and hydrolysis mode, CO(NH2)2+ H2 O=NH2 CO2 NH4,NH2 CO2 NH4=2 NH3+CO2. Therefore,a set of safe and reliable urea efficient hydrolysis system is very important for units' operation and environmental protection. Take our plant as an example,the output of each denitrification unit is 155 kg/h,and the annual use of urea in our plant is about 5000 t,in which the waste of urea is about 400 t. According to the annual operation of 5000 hours,calculated by 2200 Yuan per ton of urea,the direct economic loss is about 880,000 Yuan. At the same time,it will also cause the environmental pollution. Our plant develops and optimizes the hydrolyzer to make the equilibrium reaction of urea hydrolysis proceed positively,the conversion rate of urea hydrolysis is kept above 98%,the urea is saved,the economic value is created,and also the secondary pollution problem of hydrolyzer waste liquid to the environment is solved.
引文
[1]赵瑞敏.电站尿素热解和水解制氨工艺研究[J].山东工业技术,2018,(24):201-202.
[2]潘鹤林,宗原,黄婕.化工原理课程中的量纲分析法[J].教育教学论坛,2019,(2):165-167.
[2]潘鹤林,宗原,黄婕.化工原理课程中的量纲分析法[J].教育教学论坛,2019,(2):165-167.