本文選題：天然氣 + 高壓��； 參考：《華北電力大學(北京)》2016年碩士論文

【摘要】：隨著污染問題和能源危機的日益加重,尋求潔凈可靠的能源代替煤炭發(fā)電成為亟待解決的問題。近年來以清潔天然氣為燃料的燃氣輪機發(fā)電及燃氣-蒸汽聯(lián)合循環(huán)得到極大發(fā)展。目前受材料限制,進一步提高初溫已非常困難,高壓比燃燒成為提高燃氣輪機性能的新途徑。鑒于目前國內(nèi)外對天然氣在高壓下的徑向旋流預混燃燒研究較少,本文在總結(jié)國內(nèi)外燃燒實驗臺設計經(jīng)驗的基礎(chǔ)上,設計了天然氣高壓燃燒實驗臺,對實驗臺重要參數(shù)進行設計計算,并使用流體動力學計算軟件Fluent進行燃燒模擬,歸納總結(jié)出部分燃燒參數(shù)和工藝參數(shù)對高壓下天然氣旋流預混燃燒的影響規(guī)律,為今后實驗臺的搭建以及天然氣高壓燃燒的實驗研究奠定理論基礎(chǔ)。本文開展的工作和獲得的成果如下：1.根據(jù)國內(nèi)外燃燒室設計經(jīng)驗,結(jié)合天然氣燃燒特性和高壓條件,與生產(chǎn)廠家溝通協(xié)商后,設計了本高壓燃燒實驗臺的基本結(jié)構(gòu)和重要參數(shù)。燃燒采用預混燃燒形式,甲烷采用單管入口,空氣流經(jīng)徑向旋流器形成旋流并與甲烷混合,燃燒室還包括二次風和冷卻空氣部分。接下來計算得到標準工況時氣體管路設計參數(shù)和燃料噴嘴相關(guān)參數(shù),為實驗臺和模型的建立提供參考。2.使用前處理軟件Gambit對設計的高壓燃燒實驗臺建立模型。為驗證模型能否用于高壓燃燒的模擬研究,從兩方面測試模型網(wǎng)格的合理性：無化學反應冷態(tài)模擬和網(wǎng)格數(shù)量無關(guān)性驗證。經(jīng)測試,發(fā)現(xiàn)模型冷態(tài)模擬效果良好,網(wǎng)格數(shù)量48萬時具有較好的網(wǎng)格無關(guān)性。3.利用流體計算軟件Fluent模擬不同工況下的天然氣高壓預混燃燒情況,深入研究燃燒參數(shù)(如壓力、過量空氣系數(shù)、功率等)和工藝參數(shù)(進氣溫度、旋流度、預混段長度等)對天然氣高壓預混燃燒的影響規(guī)律,依次分析了高壓條件下變工況、變參數(shù)時燃燒室溫度場、流場、中心軸線溫度速度分布、NOx生成、噴口下游中心低速區(qū)等的變化。經(jīng)整理歸納得出天然氣高壓預混燃燒的部分基本規(guī)律,為天然氣在燃燒實驗臺及燃氣輪機中的穩(wěn)定燃燒、低NOx排放提供理論依據(jù),具有較大的實際意義。
[Abstract]:With the worsening of pollution and energy crisis, it is urgent to seek clean and reliable energy instead of coal power generation. Gas turbine power generation and gas-steam combined cycle with clean natural gas as fuel have been greatly developed in recent years. At present, it is very difficult to improve the initial temperature because of the limitation of materials. High pressure specific combustion is a new way to improve the performance of gas turbine. In view of the lack of research on the radial swirl premixed combustion of natural gas at high pressure at home and abroad, based on the summary of the design experience of the domestic and foreign combustion test bench, a natural gas high pressure combustion test bench is designed. The important parameters of the test bench are designed and calculated, and the combustion simulation is carried out by using the hydrodynamic calculation software Fluent. The influence of partial combustion parameters and technological parameters on the premixed combustion of natural gas swirling under high pressure is summarized. It lays a theoretical foundation for the construction of experimental bench and the experimental study of high pressure combustion of natural gas in the future. The work and results of this paper are as follows: 1. Based on the design experience of combustion chamber at home and abroad, combined with the combustion characteristics and high pressure conditions of natural gas, the basic structure and important parameters of the high pressure combustion test bench were designed after communicating with the manufacturer. The combustion is premixed, the methane is a single-tube inlet, the air flows through the radial cyclone to form a swirl and mixed with methane, and the combustion chamber also includes secondary air and cooling air. Then, the design parameters of gas pipeline and fuel nozzle are calculated under standard working conditions, which provides reference for the establishment of test bench and model. A preprocessing software Gambit was used to model the designed high pressure combustion test bench. In order to verify whether the model can be used in the simulation of high pressure combustion, the rationality of the model grid is tested from two aspects: cold state simulation without chemical reaction and mesh quantity independent verification. It is found that the model has good cold simulation effect and has good mesh independence when the number of meshes is 480,000. The high pressure premixed combustion of natural gas under different working conditions was simulated by the fluid calculation software Fluent. The combustion parameters (such as pressure, excess air coefficient, power, etc.) and process parameters (inlet air temperature, swirl fluidity, etc.) were studied in depth. The influence of the length of premixed section on high pressure premixed combustion of natural gas is analyzed in turn. The temperature field, flow field and temperature velocity distribution of central axis are analyzed in turn. The change of the low speed zone in the center of the nozzle downstream. Some basic laws of high pressure premixed combustion of natural gas are concluded, which provides a theoretical basis for the stable combustion of natural gas in combustion test bench and gas turbine and low NOx emission, which is of great practical significance.
【學位授予單位】：華北電力大學(北京)
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TK16

【相似文獻】

相關(guān)期刊論文 前10條

1 張根?,陳義良,劉明侯,林博穎,趙平輝;堆積床內(nèi)甲烷/空氣預混燃燒的理論分析[J];工程熱物理學報;2005年S1期

2 徐鵬;傅忠誠;;燃氣全預混燃燒污染物排放的研究[J];煤氣與熱力;2005年12期

3 曹海亮;徐進良;張永立;趙黛青;;微小尺度下氫氣預混燃燒的實驗研究[J];力學學報;2006年03期

4 易洪斌;曾旭杰;;預混燃燒的技術(shù)應用價值和未來發(fā)展趨勢[J];現(xiàn)代家電;2010年10期

5 張敏;;全預混燃燒技術(shù)在燃氣具中的應用原理[J];現(xiàn)代家電;2010年08期

6 龔志軍;武文斐;李保衛(wèi);;預混燃燒對湍流影響的實驗研究[J];冶金能源;2013年02期

7 劉全清;燃氣預混燃燒系統(tǒng)的優(yōu)化設計與調(diào)試[J];工業(yè)加熱;1999年06期

8 李宇紅,祁海鷹,張宏武;甲烷預混燃燒火焰的詳細數(shù)值模擬[J];工程熱物理學報;2002年01期

9 林博穎;張根p，

本文編號：1990298