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Physical Fields’ Characteristic Study & Structural Optimization of a SCR Denitrification Reactor

Author: LuoZuo
Tutor: ChenDongLin
School: Changsha University of Science and Technology
Course: Thermal Power Engineering
Keywords: selective catalytic reduction denitrification reactor current sharing simulation
CLC: X773
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 0
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Abstract


SCR (Selective Catalytic Reduction) flue gas denitrification technology in coal-fired power plants has become the international mainstream at present and even quite a long time in the future for its high efficiency and mature technology. The two important indicators to measure SCR DeNOx performance are denitrification rate and the ammonia escape rate largely depends on mixed concentration of nitrogen oxide and reducer before entering the catalyst bed and velocity distribution uniformity.This subject aimed at the technical problems of gas and ammonia mixing inequality in the preceding flue of SCR flue gas denitrification catalyst reactor in thermal power plants, an experimental model was designed for effect research of different deflector structure and arrangement for flue gas field, ammonia and fly ash concentration field inside the reaction under variety load conditions. This model, on the premise of geometric similarity, Reynolds similarity and so on, reduced the proportion of 10:1 as the prototype of a SCR flue gas denitrification reactor in a 600MW unit to study the original system gas flow characteristics, pressure drop, mixing characteristics of gas and ammonia, different deflector structure and arrangement in order to guide the original system’s design and operation. The model used modular structure is able to simulate a variety of physical fields in SCR flue gas denitrification reactor in coal-fired boilers under different capacities, different combustion and different coal and also can make quantitative test, automated data collection and analysis, visualize observation and it provide a good reference for SCR flue gas denitrification reactor’s design in large-scale coal-fired boiler.Based on the designed SCR flue gas denitrification reactor experimental model, simulated and tested the gas flow, ammonia injection and mixing case, the distribution of fly ash and the pressure drop in the reactor under different load conditions, different deflector structure and arrangement, different structure and resistance of catalyst layer, obtained the effect law of deflector, ammonia nozzle, rectified grid and other flow control device for physical field in reactor under different load conditions and fly ash distribution.To investigate the effect of different deflector arrangement in SCR flue gas denitrification reactor for gas flow field and ammonia distribution concentration, numerical simulation was done on flue gas flow, ammonia injection and concentration and the pressure distribution of the flue in the SCR flue gas denitrification reactor based on the Fluent software. Use the numerical simulation to verify the physical modeling simulation’s accuracy, while the conclusions of physical simulation guide numerical simulation of SCR flue gas denitrification process under various conditions and structural arrangement, not only ensuring the accuracy but also simplify the study, omitted a lot of manpower and material resources the physical simulation process needed.Studied physical simulation with numeral simulation, our group found a better deflector arrangement in SCR flue gas denitrification reactor for 600MW coal-fired unit that reduce root-mean-square error (RMS error) of gas flow velocity distribution to less than 14%, ammonia concentration to less than 5% and have a uniformly distribution of fly ash in the preceding flue of SCR flue gas denitrification catalyst reactor, which promised high denitrification rate and low ammonia escape rate at a domestic leading level.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Power of industrial waste treatment and comprehensive utilization > Electric Power Industry
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