本文選題：合成氣 + 層流擴(kuò)散火焰�。� 參考：《南京師范大學(xué)》2017年碩士論文

【摘要】：合成氣可由煤、生物質(zhì)、廢棄物在汽化爐中氣化,然后凈化獲得,是一種清潔燃料,具有廣闊的應(yīng)用前景。但不同原料得到的合成氣組分比較復(fù)雜、熱值較低、燃燒穩(wěn)定性差,給它的實(shí)際應(yīng)用帶來了很多困難,其中NOx排放控制就是重要問題之一。在氣體燃料中添加稀釋劑是抑制NOx生成的一種有效方法,但相關(guān)實(shí)驗(yàn)研究仍有待進(jìn)一步完善。本文基于氣體燃料稀釋燃燒技術(shù),以同向軸對(duì)稱層流擴(kuò)散火焰為對(duì)象,采用實(shí)驗(yàn)研究方法,就添加稀釋劑對(duì)合成氣/空氣擴(kuò)散火焰中NO和CO污染物形成的影響進(jìn)行了研究。建立氣體燃料擴(kuò)散燃燒實(shí)驗(yàn)系統(tǒng),采用實(shí)驗(yàn)方法研究了不同碳?xì)浔鹊暮铣蓺饣鹧嬖诓煌♂寗┓N類、稀釋比和稀釋劑添加側(cè)條件下NO和CO的排放特性和變化規(guī)律,記錄了合成氣燃燒過程中火焰形貌的變化情況。實(shí)驗(yàn)發(fā)現(xiàn)隨著H2/CO比的減小純合成氣燃燒的火焰顏色由淺變深,由淡黃色變?yōu)榈{(lán)色,再由淡藍(lán)色變?yōu)榱了{(lán)色�；鹧娓叨茸兏�,寬度變窄,呈拉伸狀。測量尾氣中的污染物含量,發(fā)現(xiàn)實(shí)驗(yàn)范圍內(nèi)的三種稀釋劑均可以有效降低NO及CO的生成量。NO的排放指數(shù)EINO隨合成氣碳?xì)浔鹊脑龃蠖鴨握{(diào)增加,CO的排放指數(shù)EIco隨碳?xì)浔鹊脑龃蠖鴾p小。對(duì)N2、Ar及CO2三種稀釋均有EINO (R) EINO (Y)成立,對(duì)N2、CO2兩種稀釋劑有EIco (Y) EIco (R)成立。另外,EINo及EIco隨稀釋比的變化規(guī)律隨稀釋劑種類、稀釋劑添加側(cè)的不同而不同。三種稀釋劑對(duì)NO的減排效果存在如下關(guān)系:CO2 N2 Ar純合成氣,即CO2效果最好,N2次之,Ar效果最差,但都比不加稀釋劑時(shí)的效果要好;類似地,對(duì)CO而言存在如下關(guān)系:N2≈ArCO2純合成氣。本文探究了不同條件下合成氣的擴(kuò)散燃燒特性,分析了 H2/CO比、稀釋劑種類、稀釋比、稀釋劑添加側(cè)等因素對(duì)合成氣燃燒特性的影響,揭示了合成氣燃燒過程中NOx和CO的排放規(guī)律,獲得促進(jìn)合成氣穩(wěn)定燃燒和低污染物排放的有效方法。相關(guān)實(shí)驗(yàn)數(shù)據(jù)可為實(shí)際燃燒設(shè)備的設(shè)計(jì)和優(yōu)化提供指導(dǎo),具有一定的工程應(yīng)用價(jià)值。
[Abstract]:Syngas can be gasified from coal, biomass and waste in vaporization furnace and then purified. It is a clean fuel and has a broad application prospect. However, the composition of syngas from different feedstocks is complex, the calorific value is low, and the combustion stability is poor, which brings a lot of difficulties to its practical application, among which NOx emission control is one of the important problems. The addition of diluents in gaseous fuels is an effective method to inhibit the formation of NOx, but the related experimental studies need to be further improved. Based on the gas fuel dilution combustion technology, the effects of diluent addition on the formation of no and CO pollutants in syngas / air diffusion flame were studied by means of experimental study on the coaxial symmetrical laminar diffusion flame. The experimental system of gaseous fuel diffusion combustion was established. The emission characteristics and changes of no and CO in syngas flame with different hydrocarbon ratios under different diluents, dilution ratio and diluent side were studied. The changes of flame morphology during syngas combustion were recorded. It is found that the flame color of pure syngas combustion changes from light to deep, from light yellow to light blue, and then from light blue to bright blue with the decrease of H2/CO ratio. The flame height becomes higher, the width becomes narrow, and the flame is stretched. To measure the amount of pollutants in the tail gas, It is found that the emission index EINO of no and CO can be effectively reduced by the three diluents in the range of experiment. The emission index EIco of CO decreases with the increase of the ratio of carbon to hydrogen in syngas with the increase of the ratio of carbon to hydrogen. For N _ 2N _ 2 ar and CO2, EINO (R) EINO (Y) was established, and for N _ (2) O _ (2) O _ (2) diluent, EIco (Y) EIco (R) was established. In addition, the variation of EINO and EIco with dilution ratio varies with the type of diluent and the side of diluent. The effect of the three diluents on the emission reduction of no is related to the following: the effect of CO2 is the best in N 2, followed by N 2, but is better than that in the absence of diluent; similarly, For CO, the relationship exists as follows: n _ 2 鈮，

本文編號(hào)：1950053