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首页> 外文期刊>American Journal of Electrical Power and Energy Systems >Reason Analysis and Countermeasures of Coal-Fired Power plant Denitrification Ammonia Injection Valve Blockage
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Reason Analysis and Countermeasures of Coal-Fired Power plant Denitrification Ammonia Injection Valve Blockage

机译：燃煤电厂脱硝氨气喷射阀堵塞的原因分析及对策

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摘要

This paper introduces the technological process and operation mode of denitrification and ammonia supply in coal-fired power plants. The Selective Catalytic Reduction (SCR) flue gas denitrification technology of coal-fired power plant is a great significant to environmental protection, which denitrification efficiency is up to 90%. A coal-fired power plant SCR boiler flue gas denitrification device of ammonia controlling valves often block in the winter, and need stopping the device to carry out manual cleaning, that seriously affecting the normal operation of the SCR system and NOx emissions standards. Through the mothed of analyzing of the physical scale components of liquid ammonia quality, environmental temperature, equipment, material, jam, we had found the causes of the problem. Ammonia injection valves plug is mainly made of carbon steel rusting and ammonia supplying of inner tube in oily volatile mixed cause. According to the actual situation of the equipment in the power plant, the operation mode of liquid ammonia evaporator was adjusted, the denitrification ammonia suppling pipeline was purged, the structure of ammonia injection regulating valve was reformed, and the stainless steel-pipeline was replaced. The retrofitting reason of ammonia injection regulating valves and their structure are introduced in detail, which is the key to solve the problem.
机译：介绍了燃煤电厂反硝化和氨气供应的工艺过程和运行方式。燃煤电厂的选择性催化还原烟气脱硝技术对环境保护具有重要意义，其脱硝效率高达90％。燃煤发电厂的SCR锅炉烟气脱硝装置中的氨气控制阀经常在冬季堵塞，需要停机才能进行人工清洗，严重影响了SCR系统的正常运行和NOx排放标准。通过对液氨质量，环境温度，设备，材料，堵塞等物理垢成分的分析，找出了问题的原因。氨气喷射阀的堵头主要是由碳钢生锈和内管中的氨气混合造成的油性挥发物混合而成。根据电厂设备的实际情况，调整液氨蒸发器的运行方式，净化反硝化氨供应管道，改革氨注入调节阀的结构，更换不锈钢管道。详细介绍了氨喷射调节阀的改造原因及其结构，这是解决该问题的关键。

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