本文選題：陶瓷爐窯 + 氮氧化物(NOx)�。� 參考：《華中科技大學(xué)》2015年碩士論文

【摘要】：我國NOx排放量已高居世界第一位,NOx造成的危害也愈益凸顯,因此極有必要對NOx的生成及控制進(jìn)行研究。本文以燃?xì)馓沾蔂t窯為研究對象,對典型輥道窯、隧道窯和梭式窯的氮氧化物(NOx)排放情況進(jìn)行了測量,并通過模擬計算對爐內(nèi)NOx的生成狀況進(jìn)行了了解,從機理上找出NOx生成的影響因素,針對這些影響因素提出相應(yīng)降低NOx排放的方案。通過測量發(fā)現(xiàn),陶瓷爐窯產(chǎn)生的氮氧化物中除熱力型NOx、快速型NOx、燃料型NOx外還存在一種由物料中的含氮化合物受熱分解產(chǎn)生的NOx,我們稱之為物料型NOx。對輥道窯建模計算后得到,在陶瓷爐窯燃燒溫度普遍低于1200℃情況下,熱力型NOx的生成量很少,爐中生成的氮氧化物以快速型NOx為主。此外本文還通過建模計算對陶瓷爐窯NOx生成的影響因素進(jìn)行了分析,包括燃料類型、溫度、煙氣停留時間、過�？諝庀禂�(shù)、物料和爐窯類型等,熱力型NOx主要受溫度、煙氣停留時間、過�？諝庀禂�(shù)和爐窯類型的影響;快速型NOx則主要受燃料類型和過�？諝庀禂�(shù)的影響;燃料型NOx的生成主要取決于燃料含氮量;物料類型決定了煙氣產(chǎn)物中是否會有物料型NOx生成。文章在最后針對現(xiàn)狀爐窯中存在的問題提出了幾個低NOx改進(jìn)方案,包括對輥道窯、隧道窯進(jìn)行運行工況的優(yōu)化、增加煙氣循環(huán)系統(tǒng),以及將現(xiàn)有天然氣爐窯中擴散式燃燒器改為全預(yù)混式燃燒器等。
[Abstract]:China's NOx emissions have been ranked first in the world, and the harm caused by NOx is becoming more and more prominent. Therefore, it is necessary to study the formation and control of NOx. In this paper, the emission of no _ x from typical roller kiln, tunnel kiln and shuttle kiln is measured, and the formation of no _ x in the furnace is studied by simulation calculation. The influencing factors of NOx formation are found out from the mechanism, and the scheme of reducing NOx emission is put forward in view of these influencing factors. It is found by measurement that in addition to thermal type, fast type and fuel-type no _ x, there is a kind of no _ x produced by thermal decomposition of nitrogen-containing compounds in the ceramic furnace, which we call the "material type" no _ x. After modeling and calculation of roller kiln, it is found that when the combustion temperature of ceramic kiln is lower than 1200 鈩，

本文編號：2044361