本文關(guān)鍵詞： 余熱利用 數(shù)值模擬 溴化鋰吸收式制冷機(jī)　出處：《鄭州大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在全球能源危機(jī)的大背景下,如何提高能源利用率,合理配置和利用資源已經(jīng)成為各個(gè)國(guó)家一個(gè)不得不面對(duì)的問題。我國(guó)是合成氨生產(chǎn)大國(guó),每年幾千萬噸的合成氨產(chǎn)量使得我國(guó)氨合成工業(yè)中蘊(yùn)含著巨大的節(jié)能潛力。本文以某目標(biāo)企業(yè)年產(chǎn)24萬噸合成氨項(xiàng)目為背景,針對(duì)原有生產(chǎn)流程做了一系列改進(jìn)。與改進(jìn)前方案相比,改進(jìn)方案新增了級(jí)間換熱器用于取熱,用所得熱量驅(qū)動(dòng)溴化鋰吸收式制冷機(jī),溴化鋰吸收式制冷機(jī)所制得的冰水用于冷卻新增的一入換熱器,以達(dá)到降低入口合成氣溫度的作用。本文還使用Aspen Plus軟件對(duì)整個(gè)改進(jìn)后的方案進(jìn)行了數(shù)值模擬研究,所得到的模型不但可以用于本文中所述的年產(chǎn)24萬噸合成氨工藝,還可以用于其他產(chǎn)量的合成氨生產(chǎn)工藝模擬,為企業(yè)日后的升級(jí)改造流程提供了依據(jù)。本文主要研究工作包含以下幾個(gè)方面:1.提出了新的流程改進(jìn)方案:在每級(jí)壓縮機(jī)級(jí)間加裝一個(gè)換熱器(共計(jì)9個(gè)級(jí)間換熱器),用冷卻合成氣以后所得到的95℃脫鹽水驅(qū)動(dòng)新增加的溴化鋰吸收式制冷機(jī),用所制得的8℃的冰水冷卻壓縮機(jī)初級(jí)入口氣體。2.使用Aspen Plus軟件對(duì)改進(jìn)前后的方案進(jìn)行了數(shù)值模擬分析,通過分析計(jì)算得到改進(jìn)后流程可利用的余熱總量,以及流程中各個(gè)模塊的具體參數(shù)。3.完成了溴化鋰吸收式制冷機(jī)的數(shù)值模擬,并根據(jù)模擬結(jié)果結(jié)合三洋溴化鋰制冷機(jī)設(shè)備一覽表選用了三洋LCC-61D型低溫水大溫差型溴化鋰吸收式制冷機(jī),以達(dá)到將余熱全部利用的目的。4.針對(duì)新流程完成壓縮機(jī)初級(jí)氣體入口處換熱器的設(shè)計(jì),得到了切實(shí)可行的設(shè)計(jì)結(jié)果。5.確定了改進(jìn)后方案的工作范圍,最佳工況等參數(shù)。6.對(duì)新流程進(jìn)行能效分析和經(jīng)濟(jì)性分析,從冷卻水節(jié)約量、生產(chǎn)效率提升收益、新設(shè)備投資和維護(hù)成本幾個(gè)方面進(jìn)行綜合分析。與原有流程相比新流程節(jié)水約80kg/s,噸氨降耗115k Wh,得出新流程的投資回收周期約為7.5個(gè)月。
[Abstract]:Against the background of the global energy crisis, how to improve energy efficiency and allocate and utilize resources rationally has become a problem that every country has to face. With tens of millions of tons of synthetic ammonia output per year, the ammonia synthesis industry in China has great energy saving potential. The background of this paper is the project of 240,000 tons of synthetic ammonia produced by a target enterprise. A series of improvements have been made to the original production process. Compared with the former scheme, the improved scheme has added the interstage heat exchanger for heat recovery, and used the heat to drive the libr absorption refrigerator. The ice water produced by libr absorption chiller is used to cool the new inlet heat exchanger to reduce the inlet temperature of syngas. This paper also uses Aspen Plus software to simulate the whole improved scheme. The model can be used not only in the 240,000 ton ammonia production process described in this paper, but also in the simulation of other ammonia production processes. The main research work in this paper includes the following aspects: 1. A new process improvement scheme is put forward: one heat exchanger is installed between the stages of each stage compressor (a total of 9 stages are replaced). The new added libr absorption chiller is driven by 95 鈩，

本文編號(hào)：1543417