A method for determining the inlet parameters of a selective catalytic reduction denitrification device

Abstract

The invention relates to a method for determining the inlet parameter of an SCR denitration device. According to the method, a boiler furnace, a horizontal flue and a tail portion flue are used as calculating objects, numerical simulation of the total-system combustion, heat transfer and flowing process is conducted by the aid of Fluent software, the flue gas parameters of an economizer outlet, namely an inlet of the SCR denitration device under different working conditions are obtained, and the flue gas parameters relate to velocity distribution, temperature distribution and smoke component concentration distribution; according to the whole system from the boiler furnace, the horizontal flue and the tail portion flue (to the economizer outlet), numerical simulation of the combustion, heat transfer and flowing process is conducted, movement of solid-phase particles is also taken into account, the solid-phase particle parameters of the economizer outlet, namely the inlet of the SCR denitration device under different working conditions are obtained, the problems that the design calculation and engineering actual deviation of the SCR denitration device is too big due to the fact that the inlet flue gas parameter cannot be reasonably set traditionally, and catalyst abrasion and dust accumulation can be caused for giving too little care to the movement of solid-phase particles are solved, hence, the denitration efficiency of an SCR reactor can be effectively improved, and the service life of catalysts is prolonged.

Description

technical field [0001] The invention relates to a method for determining inlet parameters of a selective catalytic reduction denitrification device, and belongs to the technical field of air pollutant control of coal-fired boilers. Background technique [0002] Selective catalytic reduction (SCR) technology has become the first choice for flue gas denitrification technology in coal-fired power plants because of its high denitrification efficiency and secondary pollution-free. Using CFD technology to numerically simulate the actual flue gas flow and ammonia injection process of SCR denitrification devices has become an important content of SCR engineering design. [0003] At present, conventional flow field simulation methods use boiler operating parameters and local test parameters as the initial conditions for calculation. When setting boundary conditions, ideal flue gas parameters are usually used, that is, uniform flue gas velocity, temperature and component concentratio...

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Problems solved by technology

[0006] Purpose of the invention: In view of the above technical problems, the present invention provides a method for determining the inlet parameters of a selective catalytic reduction denitrification device, which is used to solve the SCR reaction caused by the unreasonable setting of the inlet flue gas parameters in the numerical simulation of the flow field of the previous SCR denitrification device The deviation between the design calculation of the reactor and the actual engineering is too large, and the movement of solid particles is not considered, which causes problems such as catalyst wear and dust accumulation.

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