【摘要】：隨著我國(guó)工業(yè)化進(jìn)程加快,每年有機(jī)廢液的排放量也急劇上升,每年都會(huì)產(chǎn)生數(shù)以萬(wàn)噸計(jì)的有機(jī)廢液,嚴(yán)重威脅著生態(tài)環(huán)境。燃燒法因其方便、無(wú)害化處理效率高,同時(shí)還可以增設(shè)余熱鍋爐回收廢液焚燒的煙氣熱量,降低處理成本,是工程上處理廢液比較常用的方法。本文以某企業(yè)廢液燃燒器為對(duì)象,運(yùn)用商業(yè)流體計(jì)算軟件FLUENT進(jìn)行數(shù)值模擬,研究廢液在爐內(nèi)流動(dòng)和燃燒過(guò)程,為燃燒器的設(shè)計(jì)與優(yōu)化改造提供依據(jù)。首先根據(jù)燃燒器的結(jié)構(gòu)建立有旋流器和無(wú)旋流器兩種幾何模型,并進(jìn)行網(wǎng)格劃分。在只有空氣和燃?xì)鈬娙霠t膛的條件下,分別對(duì)爐內(nèi)冷態(tài)和熱態(tài)流場(chǎng)進(jìn)行計(jì)算,考察了燃燒器的結(jié)構(gòu)優(yōu)勢(shì)。隨后對(duì)燃料進(jìn)行調(diào)整,模擬燃?xì)庠跔t內(nèi)的燃燒,并在此基礎(chǔ)上將廢液作為二次燃料流噴射進(jìn)入爐膛,計(jì)算爐內(nèi)溫度場(chǎng)、速度場(chǎng)以及燃燒產(chǎn)物分布,通過(guò)結(jié)果對(duì)廢液在爐內(nèi)的燃燒特性有了詳細(xì)的了解。結(jié)果表明,燃燒器的結(jié)構(gòu)對(duì)爐膛內(nèi)的流場(chǎng)以及燃料空氣混合程度的促進(jìn)作用,在旋流器的作用下,氣流擾動(dòng)劇烈,形成回流區(qū),燃?xì)夂蛷U液霧滴被回流區(qū)的高溫?zé)煔饩砦?迅速干燥后著火；爐膛內(nèi)火焰具有良好的對(duì)稱性且剛性較強(qiáng),火焰高溫區(qū)狹長(zhǎng)。由于空氣量過(guò)多以及廢液含水量高,爐膛內(nèi)溫度梯度明顯而且氧含量較高,燃料燃燒比較充分而且降低了NO的生成量,結(jié)果表明,燃燒器結(jié)構(gòu)非常適合廢液在爐內(nèi)的高溫區(qū)快速、穩(wěn)定燃燒。
[Abstract]:With the acceleration of industrialization in our country, the emission of organic waste liquor increases sharply every year, and tens of thousands of tons of organic waste liquid is produced every year, which seriously threatens the ecological environment. Because of its convenience and high efficiency of innocuous treatment, the combustion method can also add waste heat boiler to recover the heat of flue gas incinerated from waste liquid and reduce the cost of treatment. It is a common method to treat waste liquid in engineering. In this paper, a commercial fluid calculation software FLUENT is used to simulate the flow and combustion process of waste liquid burner in a certain enterprise, which provides the basis for the design and optimization of burner. Firstly, according to the structure of the burner, two kinds of geometric models, hydrocyclone and non-cyclone, are established and meshed. Under the condition that only air and gas are injected into the furnace, the cold and hot flow fields in the furnace are calculated, and the structural advantages of the burner are investigated. Then the fuel is adjusted to simulate the combustion of the gas in the furnace. On this basis, the waste liquid is injected into the furnace as a secondary fuel flow to calculate the temperature field, velocity field and the distribution of combustion products in the furnace. Through the results, the combustion characteristics of waste liquid in the furnace are understood in detail. The results show that the structure of the burner promotes the flow field in the furnace and the mixing degree of the fuel and air. Under the action of the cyclone, the air flow is disturbed violently, and the reflux zone is formed, and the gas and liquid droplets are entrapped by the high temperature flue gas in the reflux zone. The flame in the furnace has good symmetry and rigidity, and the flame is narrow and narrow at high temperature. Because of excessive air volume and high water content of waste liquid, the temperature gradient in furnace is obvious and the oxygen content is high, the fuel combustion is sufficient and the no production is reduced, the results show that, The burner structure is very suitable for fast and stable combustion of waste liquid in high temperature region of furnace.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X703.3

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本文編號(hào)：2150225