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Performance Optimization And Simulation Research Of SCR Denitration System For 660MW Thermal Power Units

Posted on:2016-01-02Degree:MasterType:Thesis
Country:ChinaCandidate:H Z ZhuFull Text:PDF
GTID:2191330470963372Subject:Engineering Thermal Physics
Abstract/Summary:PDF Full Text Request
Nitrogen oxide as the main culprit of acid rain,is growing attention. "Thermal power plant air pollutant emission standards" from the beginning of 2012 promulgated regulations in 2012 new boiler and a gas turbine power generation unit of atmospheric pollutants NOx emission limit of 100 mg / m3.The existing thermal power units to implement the standard in 2014 July.With the implementation of the standard,the implementation of the standard means that the existing and new thermal power denitration equipment must be equipped with selective catalytic reduction of SCR.Selective catalytic reduction(SCR) technology is the most widely used part of nitrate removal from power plants in the world.The article introduces the equipment layout of SCR and the reaction principle, and introduces the development and current status of denitration technology at home and abroad.In this paper, the 660 MW thermal power unit of a power plant SCR denitrification system as the research object.The use of CFD software STAR-CCM+ for meshing and numerical simulation calculation, a three-dimensional model of the denitration system.Because the value of temperature in the denitrification system, flue gas, time in the catalyst layer, ammonia and nitrogen molar ratio are the main factors influencing the denitrification efficiency,through the simulation of different temperature, gas residence time value in the catalyst layer, the molar ratio of ammonia and nitrogen, denitrification efficiency changes off reactor.To find the best value of these three factors, to improve the efficiency of denitrification denitrification system in practical engineering application. Through simulation concluded: in the reactor temperature was 410 degrees, ammonia molar ratio of 1.0, the flue gas residence time in the catalyst layer is 1.0 seconds, the denitration efficiency is optimal, and ammonia are designed escape rate within the range.Denitration system structure in SCR,this paper carried out a series of adjustments to the top of the reactor guide plate,to find the optimal adjustment of a series of values. The catalyst layer at the entrance of the flue gas velocity field and ammonia concentration field distribution is more uniform,to improve the efficiency of denitrification.The conclusion is: the catalyst layer on top of the baffle changes to the overall installation angle 5. When the concentration of ammonia to optimize the distribution of a certain speed deviation also decreased, the angle is the best angle optimization.When the seventh block baffle height adjusted to 950 mm, flue gas velocity deviation and the ammonia concentration reaches a minimum deviation is the best optimization level.When a tenth block baffle height adjustment to 1480 mm, flue gas velocity variation and deviation ammonia concentration reaches a minimum height is the best optimization.
Keywords/Search Tags:Nitrogen Oxides, SCR Selective Catalytic Reduction, The Numerical Simulation, Performance Optimization
PDF Full Text Request
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