600MW旋流對沖鍋爐不同負荷下的優(yōu)化模擬
[Abstract]:For quite a long time, coal power is still the main power supply in the world. With the increasingly prominent environmental and energy problems and strict environmental standards, coal-fired power plants face unprecedented technical challenges. It is very important for coal power enterprises to find the economy under the huge cost of meeting the environmental protection requirements. In this paper, the 600MW combustion boiler of Datong No.2 Power Plant is taken as the research object. The combustion characteristics of the boiler are analyzed by numerical simulation of combustion, and the optimal operating quantity under different loads is found to improve the operation economy of the boiler. The geometric model is built up by pre-processing software Gambit, and the mesh is divided into meshes. The simulation calculation is carried out by using the commercial software Fluent of computational fluid dynamics, and the report of pulverized coal particles is generated. The velocity field and temperature field under various working conditions are obtained by using CFD-POST for post-processing analysis. Each part of the field. First, the operation parameters under each load are obtained by field test, and the correctness of the model is verified by comparing the 550MW working conditions. On the basis of combustion simulation and verification, the combustion optimization of boiler is studied. The combustion optimization variables under different loads are as follows: cinder rate, the ratio of upper and lower layer to air, and the ratio of internal and external air to cinder. The combustion optimization is based on the single variable variation. The results show that when the cinder air ratio increases, the oxygen deficiency in the main combustion zone increases, and the incomplete combustion degree increases, which results in the decrease of the pulverized coal cinder rate and the decrease of NO_x formation, and when the upper and lower combustion / air ratio increases, the cinder air will be mixed into the main flue gas later. The unburned carbon can not fully burn the embers in the burning embers, which reduces the burn-out rate of the particles, and at the same time, with the enhancement of the air grading, the amount of NO_x is reduced; when the ratio of the internal and external air to the cinder becomes smaller, because of its effect on the mixture of the cinder and the main smoke, The cinder rate increases first and then decreases. Based on the combustion optimization simulation under each load and considering the interaction between the burning efficiency and the NO_x yield, the optimal interval of each operating variable under the corresponding load is given in this paper.
【學位授予單位】:太原理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM621.2
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