Abstract
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.
Highlights
A coal-fired power plant has seven power units with an installed capacity of 5×330MW+2×1000MW, which is No 8~14
The Selective Catalytic Reduction (SCR) is considered as a mainstream technology of flue gas denitrification in thermal plant which was widely used in Europe and Japan, and the denitrification efficiency is up to 80%~ 90%
[2] During the winter or spring and autumn period, the ammonia control valve of the power plant is often blocked, which affects the normal operation of the SCR flue gas denitrification system
Summary
A coal-fired power plant has seven power units with an installed capacity of 5×330MW+2×1000MW, which is No 8~14. The 330 MW power units were designed and made in Shanghai Electrical which were forced circulation type Π subcritical drum boiler; The 1000MW units were a supercritical tower type boiler which were designed and manufactured by Shanghai Electric which were put into operation in June 2011 and May 2012, and designed with 100% flue gas SCR denitrification system. [1] From 2012 to 2014, all 330MW units were gradually transformed and added 100%SCR flue gas denitrification system. [2] During the winter or spring and autumn period, the ammonia control valve of the power plant is often blocked, which affects the normal operation of the SCR flue gas denitrification system. Jiang Pengwei et al.: Reason Analysis and Countermeasures of Coal-Fired Power Plant
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