本文選題：SCR　切入點(diǎn)：仿真模擬　出處：《華北電力大學(xué)》2017年碩士論文

【摘要】：隨著國家對環(huán)保的重視,氮氧化物的排放標(biāo)準(zhǔn)進(jìn)一步提高,氮氧化物減排成為發(fā)電企業(yè)的重點(diǎn)工作。在目前眾多的脫硝方法中,選擇性催化還原法(SCR)因其效率高、運(yùn)行穩(wěn)定、結(jié)構(gòu)簡單而被廣泛應(yīng)用。在近年來,由于反應(yīng)器在運(yùn)行中存在一些問題,所以目前對反應(yīng)器流場優(yōu)化、延長催化劑壽命及提高反應(yīng)效率成了熱點(diǎn)問題。目前對高溫催化劑的SCR的仿真模擬與優(yōu)化設(shè)計(jì)研究較多,但對于低溫催化劑SCR的仿真模擬與優(yōu)化設(shè)計(jì)較少。本次畢業(yè)設(shè)計(jì)主要對低溫催化劑SCR進(jìn)行仿真模擬與優(yōu)化設(shè)計(jì)。通過高溫催化劑SCR、低溫催化劑SCR的模擬計(jì)算比較,體現(xiàn)出了低溫催化劑SCR的優(yōu)勢。仿真模擬部分以某電廠600MW機(jī)組脫硝反應(yīng)器為模型,進(jìn)行仿真模擬,主要是在入口煙道流速分布、整流器布置以及還原劑氨與煙氣摻混情況三個方面得出了效果圖,又因?yàn)楦邷馗邏m的SCR反應(yīng)器在運(yùn)行中,煙氣攜帶較多的飛灰,易使催化劑層堵塞,在高溫環(huán)境中還會使催化劑燒結(jié)或失效,所以本次設(shè)計(jì)重點(diǎn)將研究SCR反應(yīng)器在低溫環(huán)境下的運(yùn)行情況,對其進(jìn)一步優(yōu)化,并在不同大小機(jī)組的反應(yīng)器中進(jìn)一步得到驗(yàn)證。優(yōu)化設(shè)計(jì)部分主要進(jìn)行布置方式的優(yōu)化和催化劑的優(yōu)化設(shè)計(jì)這兩個方面。通過分析SCR反應(yīng)器高溫高塵布置的存在問題,將SCR反應(yīng)器的布置方式設(shè)計(jì)成低溫低塵布置,并在低溫低塵布置的情況下進(jìn)行催化劑的優(yōu)化設(shè)計(jì)、壓損計(jì)算及阻力計(jì)算。文中主要針對三種不同設(shè)計(jì)煤種和發(fā)電量的機(jī)組進(jìn)行案例分析,將其高溫高塵下的反應(yīng)器相關(guān)數(shù)據(jù)與低溫低塵的情況相互對比,從而體現(xiàn)出低溫低塵布置時反應(yīng)器的絕對優(yōu)勢及該優(yōu)化設(shè)計(jì)的普遍適用性,并對三種機(jī)組分別進(jìn)行了催化劑的優(yōu)化設(shè)計(jì)、校核總壓力損失及煙氣阻力。進(jìn)行布置方式優(yōu)化后,三種案例的催化劑體積和反應(yīng)器體積均比高溫高塵布置時減少了大于30%;進(jìn)行催化劑優(yōu)化后,三種案例均在第一種蜂窩式催化劑下最優(yōu);并對優(yōu)化后的反應(yīng)器進(jìn)行壓力損失及煙氣阻力的計(jì)算校核。
[Abstract]:With the attention of the country to environmental protection, the emission standard of nitrogen oxides has been further improved, and nitrogen oxide emission reduction has become the key work of power generation enterprises. Among the numerous denitrification methods, selective catalytic reduction method (SCR) is of high efficiency and stable operation. The structure is simple and widely used. In recent years, because of some problems in the operation of the reactor, the flow field of the reactor is optimized. Prolonging catalyst life and improving reaction efficiency have become hot issues. At present, there are many researches on SCR simulation and optimization design of high temperature catalyst. However, the simulation simulation and optimization design of the low temperature catalyst SCR is less. This graduation project mainly carries on the simulation simulation and the optimization design to the low temperature catalyst SCR. Through the high temperature catalyst SCR, the low temperature catalyst SCR simulation computation comparison, the graduation project mainly carries on the simulation simulation and the optimization design to the low temperature catalyst SCR. In the simulation part, the denitrification reactor of a power plant 600MW unit is used as the model, and the simulation is carried out mainly at the inlet flue velocity distribution. The rectifier arrangement and the mixing of ammonia with flue gas are shown in three aspects. Because of the high temperature and high dust SCR reactor, the flue gas carries more fly ash, which makes the catalyst layer clog easily. The catalyst will also be sintered or defunct in the high temperature environment, so this design will focus on the operation of the SCR reactor at low temperature, and further optimize it. It is further verified in the reactor of different size units. The optimization design part mainly carries on the layout optimization and the catalyst optimization design these two aspects. By analyzing the SCR reactor high temperature and high dust arrangement existence question, the optimization design part mainly carries on the layout optimization and the catalyst optimization design. The layout of SCR reactor is designed as low temperature and low dust arrangement, and the optimum design of catalyst is carried out under the condition of low temperature and low dust arrangement. Calculation of pressure loss and resistance calculation. In this paper, three kinds of units with different design types of coal and power generation are analyzed by case study, and the relative data of reactor under high temperature and high dust are compared with those of low temperature and low dust. Therefore, the absolute advantage of the reactor and the general applicability of the optimal design are reflected in the arrangement of low temperature and low dust, and the optimum design of the catalyst is carried out to check the total pressure loss and flue gas resistance of the three kinds of units respectively. The catalyst volume and reactor volume of the three cases are more than 30% less than those of the high temperature and high dust arrangement, and the three cases are optimized under the first honeycomb catalyst after the catalyst optimization. The pressure loss and flue gas resistance of the optimized reactor were calculated and checked.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X773

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