本文選題：化學(xué)鏈　切入點：模擬　出處：《東南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：化石能源開發(fā)利用過程中,大量排放出的CO2是最主要的溫室氣體。減排CO2已經(jīng)成為化石能源利用的主要研究方向�；瘜W(xué)鏈高溫空分制氧技術(shù)作為一種新穎的制氧技術(shù),能有效實現(xiàn)空氣中氧氣和氮氣的分離,制取02/C02混合氣,結(jié)合常規(guī)燃煤鍋爐,能高效地實現(xiàn)二氧化碳的零排放�；贏spen Plus軟件,本文主要開展三方面工作：1)分別對化學(xué)鏈高溫制氧流程、傳統(tǒng)燃煤電廠熱力系統(tǒng)和煙氣冷卻壓縮流程進行模擬計算,并將上述三種流程進行集成。2)針對集成后的富氧燃燒系統(tǒng)進行過程分析與優(yōu)化,找出最佳運行參數(shù),考察其能耗和效率,并與傳統(tǒng)燃煤電廠進行比較。3)基于將傳統(tǒng)燃煤電廠改造為富氧燃燒系統(tǒng)中存在的局限性,本文結(jié)合化學(xué)鏈高溫制氧流程的特點,設(shè)計出一種新型的富氧燃燒熱力系統(tǒng),對其性能及運行參數(shù)進行初步分析。基于新型化學(xué)鏈高溫空分制氧(CLAS)技術(shù),針對現(xiàn)有的1000MW常規(guī)燃煤機組進行改造,初步提出了一套改造方案。采用載氧體Mn3O4-Mn2O3,氧化反應(yīng)器溫度為787℃,還原反應(yīng)器溫度為762.4℃,制氧濃度為12.2%。排煙進過冷卻壓縮后,CO2濃度超過97%,可以用于大規(guī)模運輸和儲存,實現(xiàn)了碳零排放。CLAS富氧燃燒系統(tǒng)凈效率38.92%,非常接近于常規(guī)電廠的凈效率,僅低3.28%。對CLAS富氧燃燒系統(tǒng)的CLAS系統(tǒng)、發(fā)電燃燒系統(tǒng)和煙氣冷卻壓縮系統(tǒng)進行耦合優(yōu)化。采取優(yōu)化措施后,CLAS富氧燃燒系統(tǒng)凈效率可以提高1.52%,達到40.44%�？疾炝薈LAS系統(tǒng)反應(yīng)器溫度、過量空氣系數(shù)以及不同載氧體對CLAS富氧燃燒系統(tǒng)的影響,結(jié)果表明反應(yīng)器溫度為790℃(氧化反應(yīng)器)、765℃(還原反應(yīng)器),排煙含氧量為2%和以Mn3O4-Mn2O3為載氧體的系統(tǒng)性能較優(yōu)。本文提出CLAS單壓再熱式富氧燃燒系統(tǒng)。模擬結(jié)果表明該系統(tǒng)的凈效率為43.32%。通過對比其他二氧化碳捕集技術(shù),如IGCC-CCS?傳統(tǒng)低溫空分制氧富氧燃燒技術(shù)等,CLAS單壓再熱富氧燃燒方式熱利用率較高,熱損失小。因此基于CLAS得單壓再熱式富氧燃燒電廠具有進一步研究和發(fā)展的潛力。
[Abstract]:During the development and utilization of fossil energy, the CO2 emitted from large quantities is the most important greenhouse gas. CO2 emission reduction has become the main research direction of fossil energy utilization. As a novel oxygen generation technology, the chemical chain high-temperature air separation technology is used to produce oxygen. It can effectively realize the separation of oxygen and nitrogen in the air, produce 0.2 / C02 mixture, and combine with conventional coal-fired boiler to achieve zero carbon dioxide emission efficiently. Based on Aspen Plus software, This paper mainly carries out three aspects of work: (1) to simulate the chemical chain high temperature oxygen production process, the traditional coal-fired power plant thermal system and the flue gas cooling compression process, respectively. The process analysis and optimization of the integrated oxygen-enriched combustion system are carried out to find out the best operation parameters, and to investigate the energy consumption and efficiency. Compared with traditional coal-fired power plant, based on the limitation of transforming traditional coal-fired power plant into oxygen-enriched combustion system, this paper designs a new oxygen-enriched combustion thermodynamic system based on the characteristics of chemical chain high-temperature oxygen production process. On the basis of the new chemical chain high temperature air separation oxygen production process (CLASS) technology, the existing 1000MW conventional coal-fired units were retrofitted. A set of retrofit scheme was put forward. The oxygen carrier Mn3O4-Mn2O3 was used, the temperature of oxidation reactor was 787 鈩，

本文編號：1597837