本文選題：煤層氣再燃 + 分解爐��； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：改革開放近四十年來,長(zhǎng)期的“粗放式”經(jīng)濟(jì)發(fā)展模式致使我國面臨的能源與環(huán)境問題日益嚴(yán)峻,國家對(duì)大氣污染物排放的整治力度也連年提高。面對(duì)愈加嚴(yán)格的水泥行業(yè)NO_x排放標(biāo)準(zhǔn),開發(fā)高效、低成本的水泥生產(chǎn)脫硝技術(shù)已刻不容緩。為此,本文提出了煤層氣再燃降低分解爐NO_x排放的低氮燃燒技術(shù)并對(duì)其展開數(shù)值模擬研究,旨在為水泥生產(chǎn)脫硝技術(shù)的開發(fā)與應(yīng)用提供指導(dǎo)和參考。主要內(nèi)容和結(jié)論如下:(1)以某廠TDF型分解爐為對(duì)象建立仿真計(jì)算模型,利用Fluent軟件對(duì)運(yùn)行工況下分解爐內(nèi)速度場(chǎng)、溫度場(chǎng)以及組分濃度分布特性進(jìn)行模擬和分析,獲得再燃改造依據(jù),并通過現(xiàn)場(chǎng)實(shí)測(cè)驗(yàn)證模型的可靠性。(2)提出分解爐煤層氣再燃改造方案,依次模擬分析主燃區(qū)長(zhǎng)度、再燃區(qū)長(zhǎng)度、再燃區(qū)過剩空氣系數(shù)以及煤層氣量對(duì)再燃效果的影響規(guī)律,結(jié)果表明:隨著主燃區(qū)長(zhǎng)度的增加,脫硝效率先升高后降低,而燃料燃盡率變化較小;隨著再燃區(qū)長(zhǎng)度的增加,脫硝效率逐漸上升,分解爐不完全燃燒熱損失卻逐漸加重;隨著再燃區(qū)過�？諝庀禂�(shù)的升高,脫硝效率先升高后降低,出爐生料分解率則逐漸提高;隨著煤層氣量的增多,脫硝效果逐漸變好,但分解爐燃燒效率卻小幅降低。(3)通過正交法探究四個(gè)再燃因素同時(shí)變化對(duì)分解爐生料分解率及脫硝效率的影響,結(jié)果表明若要提高再燃脫硝效率,則須以犧牲出爐生料分解率為代價(jià)。綜合平衡分析得到較優(yōu)分解爐煤層氣再燃改造方案為:煤層氣噴入高度7 m、燃盡風(fēng)噴入高度10.5 m、再燃區(qū)過剩空氣系數(shù)α=0.75、煤層氣發(fā)熱量占比12.5%。(4)通過對(duì)比分析再燃工況與運(yùn)行工況的模擬結(jié)果可知,再燃改造后:爐內(nèi)速度場(chǎng)更利于氣-粉混合和換熱;主燃區(qū)溫度有所降低,利于抑制燃料型NO的生成;分解爐出口煙氣溫度有所降低,表明分解爐熱效率升高;燃料燃盡率為91.57%,僅下降1.06個(gè)百分點(diǎn);出爐生料分解率為94.60%,提高2.94個(gè)百分點(diǎn);分解爐出口NO濃度為378.15mg/Nm3,脫硝效率為49.27%,達(dá)到現(xiàn)行國家標(biāo)準(zhǔn)。煤層氣再燃技術(shù)能夠滿足水泥生產(chǎn)脫硝需求。
[Abstract]:In the past forty years since the reform and opening up, the long-term "extensive" economic development model has made our country face increasingly serious energy and environmental problems, and the national regulation on the discharge of atmospheric pollutants has been improved year after year. In the face of more stringent NO_x emission standards in cement industry, it is urgent to develop high efficiency and low cost denitrification technology in cement production. In this paper, a low nitrogen combustion technology for reducing NO_x emission from calciner by coal bed methane reburning is proposed and numerical simulation is carried out in order to provide guidance and reference for the development and application of denitrification technology in cement production. The main contents and conclusions are as follows: (1) taking the TDF type calciner in a factory as the object, the simulation model is established. The velocity field, temperature field and component concentration distribution in the calciner under operating conditions are simulated and analyzed by Fluent software. The reburning reconstruction basis is obtained, and the reliability of the model is verified by field measurement. The scheme of reburning of calciner coal bed methane is put forward. The length of the main combustion zone and the reburning zone are simulated and analyzed in turn. The results show that the denitrification efficiency increases first and then decreases with the increase of the length of the main combustion zone, while the fuel burnout rate changes slightly, and with the increase of the length of the reburning zone, the effect of the excess air coefficient and the coal bed gas volume on the reburning efficiency increases. With the increase of excess air coefficient in the reburning area, the denitrification efficiency increases first and then decreases, and the decomposition rate of raw material increases gradually. With the increase of coal bed methane, the denitrification efficiency increases gradually, while the heat loss of the calciner increases gradually, and with the increase of excess air coefficient in the reburning zone, the denitrification efficiency increases first and then decreases. The effect of denitrification was improved gradually, but the combustion efficiency of calciner decreased slightly. 3) by orthogonal method, the effects of four factors of reburning on the decomposition rate and denitrification efficiency of raw meal of calciner were studied. The results showed that if the denitrification efficiency was to be increased, At the expense of the raw meal decomposition rate. Comprehensive equilibrium analysis shows that the optimal retrofit scheme of coal bed methane reburning in calciner is as follows: coal bed methane injection height is 7 m, burnout air injection height is 10.5 m, excess air coefficient 偽 = 0.75 in reburning zone, and the ratio of coal bed methane heat value to 12. 5%. The simulation results of the conditions and operating conditions show that, After reburning, the velocity field in the furnace is more favorable for gas-powder mixing and heat transfer, the temperature in the main combustion zone is lower, the formation of no is restrained, the flue gas temperature at the outlet of the calciner is decreased, which indicates that the thermal efficiency of the calciner is increased. The fuel burnout rate was 91.57 percent, which was only 1.06 percent lower; the decomposition rate of raw meal was 94.60 percent, which increased 2.94 percent; the no concentration at the outlet of calciner was 378.15 mg / Nm ~ 3, and the denitrification efficiency was 49.27 percent, which reached the current national standard. Coal bed methane reburning technology can meet the demand of denitrification in cement production.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ172.625;X781.5

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本文編號(hào)：1874704