本文關(guān)鍵詞：無(wú)煙煤混煤煤粉燃燒器的設(shè)計(jì)及數(shù)值仿真分析　出處：《集美大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 工業(yè)鍋爐 新型旋流濃淡煤粉燃燒器 超細(xì)煤粉 混煤 數(shù)值仿真

【摘要】：針對(duì)福建無(wú)煙煤極難燃的問(wèn)題,本文結(jié)合旋流燃燒器的運(yùn)行優(yōu)點(diǎn)和超細(xì)煤粉良好燃燒效果,利用優(yōu)質(zhì)煙煤高效的助燃煤粉特性,開(kāi)發(fā)出一種煙煤助燃超細(xì)無(wú)煙煤的新燃燒器—新型旋流濃淡煤粉燃燒器(New Type Bias Combustion Swirl Burner,簡(jiǎn)稱(chēng)(NTBCSB)),并對(duì)其燃燒特性進(jìn)行了詳細(xì)的研究。新型旋流濃淡煤粉燃燒器充分考慮了影響煤粉著火和燃燒的煤粉氣流與高溫?zé)煔獾难杆購(gòu)?qiáng)烈混合問(wèn)題:通過(guò)合理的配風(fēng)和特殊的結(jié)構(gòu),從而實(shí)現(xiàn)了煙煤助燃無(wú)煙煤粉的效果。燃燒器一次風(fēng)通道內(nèi)設(shè)置煤粉濃縮裝置,從而實(shí)現(xiàn)煤粉的濃淡燃燒;一次風(fēng)管出口的縮口有利于提高出口煤粉的慣性動(dòng)量,能夠使煤粉顆粒進(jìn)入爐膛后即能進(jìn)入回流區(qū),而不會(huì)過(guò)早地向二次風(fēng)擴(kuò)散;中等強(qiáng)度的旋流二次風(fēng)能促進(jìn)煙煤與無(wú)煙煤混合燃燒,并加強(qiáng)氣流擾動(dòng);三次直流風(fēng)的補(bǔ)入能夠穩(wěn)定火焰,并降低火焰溫度,減少NOx的排放。對(duì)新型旋流濃淡煤粉燃燒器建立了三維數(shù)值計(jì)算模型,利用專(zhuān)業(yè)的計(jì)算流體力學(xué)軟件ANSYS CFX并對(duì)采用新型燃燒器的煤粉工業(yè)鍋爐爐膛燃燒室內(nèi)的氣固兩相流場(chǎng)、壓力場(chǎng)、溫度場(chǎng)和濃度場(chǎng)進(jìn)行了模擬仿真。并對(duì)采用新型旋流濃淡煤粉燃燒器工業(yè)鍋爐爐膛燃燒室內(nèi)的回流區(qū)進(jìn)行了立體分析;通過(guò)顆粒場(chǎng)模擬,分析了煤粉在噴出燃燒器后在爐膛燃燒室內(nèi)的分布和運(yùn)動(dòng)狀態(tài)。對(duì)采用新型旋流濃淡煤粉燃燒器與改進(jìn)前的旋流燃燒器的工業(yè)鍋爐爐膛燃燒室分別進(jìn)行單燒煙煤、超細(xì)無(wú)煙煤以及煙煤與超細(xì)無(wú)煙煤混煤三種工況的燃燒特性分析,仿真結(jié)果表明:該燃燒器具有良好的穩(wěn)燃性能,并且有效的降低NOx排放。
[Abstract]:In order to solve the problem of extremely difficult combustion of anthracite in Fujian province, combined with the operating advantages of swirl burner and the good combustion effect of superfine pulverized coal, the characteristics of high quality bituminous coal with high efficiency for combustion support are utilized in this paper. A new Type Bias Combustion Swirl Burner, a new type of swirl dense and light pulverized coal burner, has been developed for bituminous coal to support the combustion of ultrafine anthracite. Abbreviated as NTB CSB). The combustion characteristics are studied in detail. The new swirl dense and light pulverized coal burner takes into account the rapid and intense mixing of pulverized coal and high temperature flue gas which affects the ignition and combustion of pulverized coal. Through reasonable air distribution and special structure. In order to realize the effect of anthracite pulverized coal combustion supported by bituminous coal, a pulverized coal concentration device is installed in the primary air channel of the burner to realize the dense and light combustion of pulverized coal. The constriction of the outlet of the primary air duct is beneficial to improve the inertia momentum of the outlet pulverized coal, which can make the pulverized coal particles enter the backflow zone after entering the furnace, and not spread to the secondary air prematurely. The secondary wind energy with medium intensity swirl can promote the mixed combustion of bituminous coal and anthracite and enhance the disturbance of air flow. The recharge of the tertiary DC air can stabilize the flame, reduce the flame temperature and reduce the NOx emission. A three-dimensional numerical model for the new swirl thick-light pulverized coal burner is established. The gas-solid two-phase flow field and pressure field in the combustion chamber of pulverized coal fired industrial boiler with a new type burner are analyzed by using the professional computational fluid dynamics software ANSYS CFX. The temperature field and concentration field were simulated, and the reflux zone in the furnace combustion chamber of industrial boiler with a new swirl dense and light pulverized coal burner was analyzed. Through particle field simulation. The distribution and movement state of pulverized coal in the furnace combustion chamber after injection burner are analyzed. The single burning bituminous coal in the furnace combustion chamber of industrial boiler with new swirl dense and light pulverized coal burner and the improved swirl burner is carried out respectively. . The combustion characteristics of ultrafine anthracite and bituminous coal mixed with ultra-fine anthracite are analyzed. The simulation results show that the burner has good combustion stability and effectively reduces NOx emissions.
【學(xué)位授予單位】：集美大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TK223.23

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 趙伶玲;周強(qiáng)泰;趙長(zhǎng)遂;;旋流煤粉燃燒第四類(lèi)穩(wěn)燃技術(shù)[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年04期

2 高正陽(yáng),方立軍,周健,閻維平;混煤燃燒特性的熱重試驗(yàn)研究[J];動(dòng)力工程;2002年03期

3 趙伶玲;周強(qiáng)泰;;旋流燃燒器的穩(wěn)燃及其結(jié)構(gòu)優(yōu)化分析[J];動(dòng)力工程;2006年01期

4 姚強(qiáng),岑可法,施正倫,曹欣玉,施正展,曹英武;多煤種配煤特性的試驗(yàn)研究[J];動(dòng)力工程;1997年02期

5 郭嘉,曾漢才;混煤熱解特性及熱解機(jī)理的熱重法研究[J];鍋爐技術(shù);1994年08期

6 趙振宙;趙振寧;孫輝;;旋流燃燒器數(shù)值模擬和優(yōu)化改造[J];鍋爐技術(shù);2006年04期

7 李明亮;;珠海發(fā)電廠燃煤鍋爐印尼煤摻燒運(yùn)行特性與優(yōu)化[J];鍋爐技術(shù);2006年06期

8 池俊杰;池作和;孫公鋼;王進(jìn)卿;張光學(xué);;煤粉工業(yè)鍋爐燃燒器和爐膛數(shù)值模擬與試驗(yàn)研究[J];電站系統(tǒng)工程;2013年05期

9 林仁鳳;三化熱電廠煤粉爐燃用本省無(wú)煙煤經(jīng)驗(yàn)介紹[J];福建能源開(kāi)發(fā)與節(jié)約;1999年01期

10 裘立春,熊建國(guó),應(yīng)劍,張書(shū)謹(jǐn);煤粉鍋爐旋流式燃燒器的新發(fā)展[J];華東電力;1998年02期

相關(guān)博士學(xué)位論文 前4條

1 趙伶玲;花瓣燃燒器的穩(wěn)燃性能與應(yīng)用研究[D];東南大學(xué);2005年

2 蔣嘯;不同細(xì)度煤粉燃燒特性及粉煤灰酸浸處理中硫酸鋁銨循環(huán)利用試驗(yàn)研究[D];浙江大學(xué);2008年

3 方慶艷;低揮發(fā)份煤及其混煤燃燒數(shù)值模擬與試驗(yàn)研究[D];華中科技大學(xué);2007年

4 白濤;燃煤鍋爐低NOx燃燒系統(tǒng)的數(shù)值模擬與試驗(yàn)研究[D];華北電力大學(xué);2014年

相關(guān)碩士學(xué)位論文 前2條

1 周強(qiáng);旋流煤粉燃燒器的燃燒優(yōu)化[D];重慶大學(xué);2008年

2 何亞強(qiáng);卓資電廠燃燒器結(jié)渣和風(fēng)箱燒損原因分析及解決方案[D];華北電力大學(xué)（河北）;2010年

，

本文編號(hào)：1358939