本文選題：煤粉富氧燃燒 + 加壓��； 參考：《北京交通大學(xué)》2015年碩士論文

【摘要】：富氧燃燒技術(shù)作為一種新型環(huán)境友好的燃煤方式,其原理是利用空氣分離獲得的高純氧和部分鍋爐排煙(主要是C02和H20)混合而成的混合氣代替空氣作為燃燒時(shí)的氧化劑,從而使燃燒排煙中的C02濃度大幅提高,高濃度的CO2有利于進(jìn)行分離和貯存,是近些年來較為有希望的燃煤近零排放技術(shù)之一。而在常規(guī)富氧燃燒原理的基礎(chǔ)上提出的加壓富氧燃燒概念,具有明顯的技術(shù)和經(jīng)濟(jì)優(yōu)勢。目前國內(nèi)外對于加壓富氧燃燒技術(shù)的研究主要集中在數(shù)值模擬及通過熱重實(shí)驗(yàn)研究富氧燃燒方式下煤粉的燃燒與燃盡特性,因此,通過實(shí)驗(yàn)研究煤粉在加壓富氧條件下的燃燒過程,探究壓力對煤粉燃燒特性的影響規(guī)律,將有助于煤粉加壓富氧燃燒技術(shù)的健康發(fā)展。本文主要采用實(shí)驗(yàn)研究和理論分析的方法對下述問題開展了重點(diǎn)研究。 首先使用Aspen Plus流程模擬軟件對煤粉在加壓富氧條件下的燃燒過程進(jìn)行了熱力學(xué)分析研究,研究了壓力對燃燒生成物的影響。之后完成了加壓固定床反應(yīng)器實(shí)驗(yàn)裝置的設(shè)計(jì)、搭建及調(diào)試：對實(shí)驗(yàn)零部件進(jìn)行了測試并對實(shí)驗(yàn)裝置進(jìn)行了總體安裝、檢測和試運(yùn)行。確保所搭建的實(shí)驗(yàn)裝置可以安全、可靠地運(yùn)行。最后在搭建好的加壓固定床反應(yīng)器系統(tǒng)上開展了加壓富氧條件下煤粉燃燒實(shí)驗(yàn),并就壓力對煤粉富氧燃燒特性及煙氣成份的影響進(jìn)行了分析。結(jié)果表明：與常壓條件相比,煤粉在O230%/CO270%氣氛加壓條件下燃燒時(shí),著火時(shí)間隨壓力的增加而下降,且下降幅度逐漸減小,2MPa及5MPa工況著火較為迅速；燃盡時(shí)間隨壓力的增加而增加,5MPa工況燃盡時(shí)間最長,而3MPa工況下煤粉燃盡時(shí)間與常壓工況下煤粉富氧燃燒燃盡時(shí)間接近；燃燒最高溫度隨壓力的增加而升高,在2MPa時(shí)達(dá)到最高;不同壓力工況下煤粉燃燒速率隨壓力變化表現(xiàn)出較大差異。不同壓力工況下煙氣中氧氣濃度變化都經(jīng)歷先降后升的過程,其中在0.1MPa、4MPa、5MPa工況下O2濃度在反應(yīng)3分鐘時(shí)達(dá)到最小值：CO濃度隨壓力的變化都隨時(shí)間經(jīng)歷了先升后降的過程。相對于常壓,加壓工況下CO濃度顯著下降；各工況下CO2濃度的變化趨勢比較類似,在整個(gè)過程中都隨時(shí)間經(jīng)歷了一定的波動,在各個(gè)時(shí)間點(diǎn),基本隨壓力的增加而升高。
[Abstract]:As a new kind of environment-friendly coal burning technology, oxygen-enriched combustion technology is based on the mixture of high purity oxygen and partial boiler exhaust gas (mainly CO2 and H20), which is obtained by air separation instead of air as oxidant in combustion. Therefore, the CO2 concentration in combustion and exhaust smoke is greatly increased, and the high concentration of CO2 is favorable for separation and storage. It is one of the promising near-zero emission technologies for coal combustion in recent years. On the basis of the conventional oxygen-enriched combustion principle, the concept of pressurized oxygen-enriched combustion has obvious technical and economic advantages. At present, the research on pressurized oxygen-enriched combustion technology at home and abroad is mainly focused on numerical simulation and thermogravimetric experiments to study the combustion and burnout characteristics of pulverized coal under oxygen-enriched combustion mode. The experimental study on the combustion process of pulverized coal under the condition of pressurized oxygen enrichment and the study of the influence of pressure on the combustion characteristics of pulverized coal will contribute to the healthy development of pressurized oxygen-enriched combustion technology of pulverized coal. This paper focuses on the following problems by means of experimental research and theoretical analysis. Firstly, the thermodynamic analysis of combustion process of pulverized coal under pressurized and oxygen-enriched conditions was carried out by using Aspen Plus process simulation software, and the effect of pressure on combustion product was studied. After that, the design, construction and debugging of the experimental device of pressurized fixed-bed reactor are completed. The experimental parts are tested, and the experimental device is installed, tested and tested. Make sure that the experimental device can run safely and reliably. Finally, the experiments of pulverized coal combustion under the condition of pressurized oxygen enrichment were carried out in a pressurized fixed-bed reactor system, and the effects of pressure on the combustion characteristics of pulverized coal and the composition of flue gas were analyzed. The results show that the ignition time of pulverized coal decreases with the increase of the pressure, and decreases gradually with the increase of pressure, and decreases gradually under the condition of O _ 230 / CO _ (270)% under atmospheric pressure, and the ignition time of pulverized coal under the condition of O _ (230) / CO _ (270)% atmosphere is faster than that under normal pressure. The burnout time increases with the increase of pressure at 5 MPA, but the burnout time of pulverized coal under 3MPa condition is close to that of pulverized coal combustion under atmospheric pressure, and the maximum combustion temperature increases with the increase of pressure, and reaches the highest at 2MPa. The combustion rate of pulverized coal varies greatly with the pressure under different pressure conditions. The change of oxygen concentration in flue gas under different pressure conditions all experienced the process of first decreasing and then rising. In the condition of 0.1 MPA ~ 4 MPA, O _ 2 concentration reached the minimum value in 3 minutes of reaction, and the change of oxygen concentration with pressure experienced the process of rising first and then decreasing with time. Compared with atmospheric pressure, CO concentration decreased significantly under pressurized conditions, and the variation trend of CO2 concentration was similar under each condition, which fluctuated with time during the whole process, and increased with the increase of pressure at each time point.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK16

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