發(fā)布時間：2018-03-10 00:00

  本文選題：多晶硅　切入點：還原尾氣分離　出處：《湖南大學》2014年碩士論文　論文類型：學位論文

【摘要】：近年，太陽能利用技術的不斷發(fā)展，使得生產太陽能電池的原材料—多晶硅引起了人們的廣泛關注。多晶硅的生產方法主要有改良西門子法、硅烷法、冶金法等，以改良西門子法生產多晶硅的應用最為廣泛。但是從目前的生產狀況來看，改良西門子法生產多晶硅的核心技術依舊掌握在仍然被發(fā)達國家壟斷，因此國內多晶硅的生產技術落后、能耗高、生產成本相對較高等問題，特別是尾氣干法回收工藝。該工藝作為多晶硅生產的核心工藝部分，對整個工藝的能量消耗、物料的循環(huán)利用有著重要的影響。因此，降低多晶硅生產中還原尾氣分離回收利用過程的能耗是非常有意義的。 本文以國內某公司年產3200噸多晶硅的生產裝置為基礎，以多晶硅生產還原尾氣為研究對象，以氯硅烷為吸收劑，以氯化氫和氫氣為目的產物，利用AspenPlus軟件，選用NRTL物性方法和嚴格計算模塊RadFrac，對尾氣吸收解吸分離工藝流程進行模擬。吸收解吸分離工藝主要設備包括吸收塔、解吸塔和換熱器，流程簡單，，操作方便，結果可靠。模擬結果顯示：氯化氫的吸收率達到99.00%，與原始吸收解吸工藝流程取得了相同的吸收解吸分離效果。 其次，運用靈敏度分析法，對原吸收解吸分離工藝進行操作參數的優(yōu)化，主要從以下幾點進行模擬：吸收塔和解吸塔的各進料物流的溫度、各設備的操作壓力、吸收劑的流量以及吸收解吸兩塔的理論塔板數等方面，以便確定各個操作參數對氯化氫吸收解吸效果和系統(tǒng)能耗的影響。 最后，介紹了精餾塔設置中間換熱器的工藝和分股進料工藝的節(jié)能原理以及其相關工藝參數的確定原則，提出改進的兩種工藝流程，分別是解吸塔塔頂置中間冷凝器的工藝流程和富液分流分股進料的工藝流程，并且對兩流程進行模擬分析，結果顯示：與原始工藝的負荷相比，中間冷凝器工藝和分股進料工藝都有節(jié)能的跡象，相對來說，中間換熱器工藝節(jié)能不是特別明顯，但是采用分股進料工藝，吸收-解吸體系節(jié)能非常明顯，可以使得低溫冷量節(jié)約26.85%，蒸汽用量節(jié)約28.95%�？梢�，在多晶硅生產中還原尾氣回收中采用分股進料工藝可以達到節(jié)能的效果。
[Abstract]:In recent years, the development of solar energy technology, the raw materials, polysilicon production of solar cells has attracted widespread attention. The main method of producing polysilicon have improved SIEMENS method, silane method, metallurgical method, the modified SIEMENS polysilicon production is most widely used. But from the present situation of the core. Technology for production of polysilicon in the improved SIEMENS method remain still monopolized by developed countries, so the domestic polysilicon production technology backward, high energy consumption, the production cost is relatively high, especially dry tail gas recovery process. The technology as the core technology of polysilicon production of the whole process, the energy consumption of the circulation of the material utilization an important influence. Therefore, reduction in the production of polysilicon reduction exhaust gas separation recycling process of the energy consumption is very meaningful.
The production device taking a domestic company with an annual output of 3200 tons of polysilicon based on polysilicon production reduction exhaust gas as the research object, using chlorosilane as absorbent to hydrogen chloride and hydrogen production by using AspenPlus software, the NRTL property method and strict RadFrac calculation module, the tail gas absorption desorption separation process was simulated. The absorption desorption separation process of main equipment including absorption tower and desorption tower and heat exchanger, simple process, convenient operation, reliable results. The simulation results show that the hydrogen chloride absorption rate reached 99%, and the original absorption desorption process has achieved the same effect of absorption and desorption separation.
Secondly, using the sensitivity analysis method, to optimize the operation parameters of the original absorption desorption separation process is simulated, mainly from the following points: absorption tower and desorption tower the feed stream temperature, the equipment operating pressure, the number of theoretical plates such as absorbent flow rate and absorption desorption tower two, in order to determine effects of various operating parameters on hydrogen chloride absorption desorption effect and energy consumption of the system.
Finally, the principle to determine the energy saving principle is introduced and the split column set of intermediate heat exchanger feeding process and related parameters, puts forward two kinds of process improvement, are the technology process and the rich liquid desorption tower top middle condenser shunt split feed, and simulation analysis of the two process, the results showed that: compared with the original process load, intermediate condenser technology and split feed process have such signs, relatively speaking, the middle of the heat exchanger energy-saving process is not obvious, but the split feed process, absorption desorption system of energy is very obvious, can make the cryogenic energy savings of 26.85%, steam saving 28.95%. visible in polysilicon production in reducing tail gas recovery by the split feed process can achieve the effect of energy saving.

【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TQ127.2;TM914.4

【參考文獻】

相關期刊論文 前10條

1 楊德仁;;太陽電池用多晶硅材料的現(xiàn)狀和發(fā)展[J];中國建設動態(tài)(陽光能源);2007年01期

2 司恭;;改良西門子工藝生產多晶硅的安全問題[J];安全;2010年02期

3 蔣榮華,肖順珍;國內外多晶硅發(fā)展現(xiàn)狀[J];半導體技術;2001年11期

4 梁駿吾;電子級多晶硅的生產工藝[J];中國工程科學;2000年12期

5 楊濤;;改良西門子法生產多晶硅工藝設計探討[J];貴州化工;2009年03期

6 卜新平;;國內外多晶硅行業(yè)現(xiàn)狀與發(fā)展趨勢[J];化學工業(yè);2008年07期

7 溫雅;胡仰棟;單廷亮;;改良西門子法多晶硅生產中分離工藝的改進[J];化學工業(yè)與工程;2008年02期

8 李昀s

本文編號：1590832