Abstract
A systematic performance test was carried out for the ultra-low emission modification project of the Selective Catalytic Reduction (SCR) denitration system of a 600 MW coal-fired unit in a thermal power plant. Terms of the performance tests include denitration efficiency, ammonia escape rate, and SO2/SO3 conversion rate. The distribution of gas velocity and NOx concentration in flue gas of SCR inlet and outlet were summarized. The effect of unit load and gas velocity to denitration efficiency, ammonia escape rate and SO2/SO3 conversion rate were discussed after the test. The result favours design and retrofit of the ultra-low emissions coal-fired power unit in China. Through technical trials, a set of practical test methods suitable for the actual situation was concluded.
Highlights
China set up strict standard to the emission of pollutant form coal-fired power station for environment protection
Gas velocity to denitration efficiency, ammonia escape rate and SO2/SO3 conversion rate were discussed after the test
It is required that the outlet NOx concentration should be lower than 80 mg/Nm3, the total denitration efficiency should be no less than 80%, the ammonia escape rate was no more than 3 ppm, and the SO2/SO3 conversion rate was lower than 1% under the boiler maximum continuous rating (BMCR) condition for the treatment of 100% flue gas volume with design coal
Summary
China set up strict standard to the emission of pollutant form coal-fired power station for environment protection. All-sided implementation of retrofit for ultra-low emission and energy-saving to coal-fired power station (Huanfa[2015]164) were published by the Ministry of Ecology and Environment, the National Development and Reform Commission, and the National Energy Administration of China for all existing coal-fired units with the condition to retrofit[1]. 2 coal-fired unit of a thermal power plant was retrofit to achieve the ultra-low emission standard. Terms of the performance test include denitration efficiency, ammonia escape rate, and SO2/SO3 conversion rate. The distribution of gas velocity and NOx concentration were summarized. Gas velocity to denitration efficiency, ammonia escape rate and SO2/SO3 conversion rate were discussed after the test. The result favours design and retrofit of the ultra-low emissions coal-fired unit in China. A feasible measurement method for the test of ultra-low emissions unit was summarized
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