本文選題：聲學(xué)測溫 + NO_x消減�。� 參考：《華北電力大學(xué)(北京)》2014年碩士論文

【摘要】：近年來,隨著國內(nèi)經(jīng)濟的快速發(fā)展,氮氧化物(NOx)的排放量迅速增加,嚴重污染了生態(tài)環(huán)境,已成為制約社會經(jīng)濟發(fā)展的重要因素之一�；痣姀S因其NOx排放量大且相對集中、較其他分散源容易控制,成為國家控制NOx排放的首選目標,因此脫硝成為火電企業(yè)“十二五”期間必須完成好的節(jié)能減排任務(wù)。本文從燃煤鍋爐NOx控制消減的角度出發(fā),基于本課題組聲學(xué)技術(shù)的特色優(yōu)勢,一方面將聲學(xué)測溫技術(shù)與爐內(nèi)SNCR脫硝系統(tǒng)相結(jié)合,選取實例在fluent模擬的基礎(chǔ)上,采取合適的聲學(xué)測溫裝置布置,進行最優(yōu)溫度窗口的確定以及SNCR噴氨的設(shè)計,基于聲學(xué)測溫的爐膛SNCR脫硝的噴氨設(shè)計綜合考慮了溫度窗口和爐膛結(jié)構(gòu)因素,設(shè)計方案合理且可行,在提高脫硝效率,減少氨逃逸等問題上具有積極的作用,為SNCR的優(yōu)化提供了切實可行的方案；另一方面自行設(shè)計搭建煤粉燃燒實驗臺,對聲波助燃現(xiàn)象,聲波降低NOx生成的影響效果進行了理論論述和實驗研究,著重探究了不同聲波頻率,聲壓值對NOx生成的影響規(guī)律,實驗結(jié)果證明了聲波對煤粉燃燒的促進作用,同時煤粉在聲場下的燃燒可以一定程度的降低NOx的生成,作用最明顯的區(qū)域在風(fēng)粉混合燃燒段。在實驗條件下,相對低頻(200Hz)的和高聲壓(120dB)的聲波,對NOx的降低效果更突出。此次實驗可以為理論的驗證起到參考作用,為實際的燃燒進行一定的指導(dǎo)。
[Abstract]:In recent years, with the rapid development of domestic economy, the emission of no _ x has increased rapidly, which has seriously polluted the ecological environment, and has become one of the important factors restricting the development of social economy. Because the NOx emission of thermal power plant is large and relatively concentrated, it is easier to control than other dispersive sources, so denitrification has become the first choice of the state to control NOx emissions, so denitrification has become a good task of energy saving and emission reduction for thermal power enterprises during the 12th Five-Year Plan period. In this paper, from the point of view of NOx control and subtraction of coal-fired boiler, based on the characteristic advantages of acoustics technology in our group, on the one hand, the acoustical temperature measurement technology is combined with SNCR denitrification system in furnace, and an example is selected on the basis of fluent simulation. The optimum temperature window and the design of SNCR ammonia injection are determined by adopting the appropriate arrangement of acoustic temperature measuring device. The ammonia injection design of SNCR denitrification in furnace based on acoustic temperature measurement takes into account the temperature window and furnace structure factors. The design scheme is reasonable and feasible, which plays an active role in improving denitrification efficiency and reducing ammonia escape, which provides a feasible scheme for the optimization of SNCR. On the other hand, the experimental bench of pulverized coal combustion is designed and built by ourselves to support the phenomenon of acoustic wave combustion. In this paper, the influence of acoustic wave on the formation of NOx is discussed theoretically and experimentally. The influence of different frequency and pressure of sound wave on the formation of NOx is discussed. The experimental results show that the effect of acoustic wave on the combustion of pulverized coal is promoted. At the same time, the combustion of pulverized coal in the sound field can reduce the formation of NOx to a certain extent, the most obvious role of the area in the air-powder combustion section. Under the experimental conditions, the reduction of NOx by the acoustic waves of relative low frequency (200Hz) and hypersonic pressure (120dB) is more prominent. This experiment can serve as a reference for theoretical verification and guide the actual combustion.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：X773

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