【摘要】：根據(jù)中國石油吉林石化公司電石廠氯磺化聚乙烯脫揮生產(chǎn)線由于受到設(shè)備能力限制,實(shí)際產(chǎn)能一直不能達(dá)到設(shè)計(jì)標(biāo)準(zhǔn),制約了裝置的競爭能力和發(fā)展空間的實(shí)際情況,本文研究了同向雙螺桿擠出機(jī)在氯磺化聚乙烯脫揮造粒生產(chǎn)中的工業(yè)應(yīng)用。本文采用數(shù)值模擬和實(shí)驗(yàn)研究相結(jié)合的方法,研究了同向雙螺桿擠出機(jī)螺紋元件和螺桿組合對氯磺化聚乙烯橡膠脫揮效果的影響;對雙螺桿擠出機(jī)脫揮生產(chǎn)線的工藝流程和操作參數(shù)進(jìn)行了優(yōu)化;通過相應(yīng)的技術(shù)改造,成功地將同向雙螺桿擠出機(jī)應(yīng)用于氯磺化聚乙烯的工業(yè)化生產(chǎn)中,滿足了產(chǎn)品質(zhì)量穩(wěn)定、長周期連續(xù)運(yùn)行的生產(chǎn)要求。目前這套機(jī)組已經(jīng)能夠長周期運(yùn)行和連續(xù)產(chǎn)出優(yōu)等產(chǎn)品。研究工作取得以下主要成果:(1)對同向雙螺桿擠出機(jī)捏合塊結(jié)構(gòu)的流場分析結(jié)果表明,氯磺化聚乙烯熔體的高壓區(qū)位于捏合塊螺棱的推進(jìn)面,低壓區(qū)位于螺棱的背面,由于壓力差的存在,使氯磺化聚乙烯膠體中的揮發(fā)組分形成閃蒸,可快速脫除膠體中的揮發(fā)組分。捏合塊結(jié)構(gòu)的混煉過程以剪切流動(dòng)為主,拉伸流動(dòng)主要集中在嚙合盤螺棱的推進(jìn)面及背面剪切速率較低的區(qū)域。其中,當(dāng)嚙合塊以KB1的方式排列時(shí),更容易形成較大的壓差,且流場中有更高比例的區(qū)域處于拉伸流動(dòng),因此有更好的脫揮效果。(2)實(shí)驗(yàn)結(jié)果表明,合理配置螺桿組合的同向雙螺桿擠出機(jī),有較好的脫揮效果,能夠生產(chǎn)出實(shí)際生產(chǎn)中氯磺化聚乙烯橡膠的兩個(gè)牌號(CSM30和CSM40)的優(yōu)等品。隨著機(jī)筒溫度的增加,氯磺化聚乙烯中的揮發(fā)組分更容易被脫除;而增加螺桿轉(zhuǎn)速,縮短了膠在機(jī)筒中的停留時(shí)間,殘留揮發(fā)份呈逐漸升高趨勢。(3)實(shí)驗(yàn)結(jié)果表明,切粒冷卻方式對脫揮效果有一定的影響。采用水冷卻方式微量水會(huì)進(jìn)入到膠內(nèi),對脫除揮發(fā)份不利,而風(fēng)冷卻有利于脫揮。(4)通過采用同向雙螺桿擠出機(jī)和適當(dāng)?shù)募夹g(shù)改造后,生產(chǎn)氯磺化聚乙烯的裝置產(chǎn)量由原來的1000噸/年提高至2000噸/年,產(chǎn)品的優(yōu)等品率達(dá)到了 80%,同時(shí)四氯化碳的消耗沒有增加,使得環(huán)保排放達(dá)到了要求。通過提高產(chǎn)量和提升產(chǎn)品質(zhì)量,不僅提高了經(jīng)濟(jì)效益和環(huán)保效益,而且提升了氯磺化聚乙烯產(chǎn)品的競爭力和生存力。
[Abstract]:According to the fact that the actual production capacity of chlorosulfonated polyethylene devolatilization production line in calcium carbide plant of Jilin Petrochemical Company of PetroChina has been unable to meet the design standard because of the limitation of equipment capacity, which restricts the competitiveness of the plant and the actual situation of development space, the industrial application of co-directional twin-screw extruder in chlorosulfonate polyethylene devolatilization granulation production is studied in this paper. In this paper, the effects of thread elements and screw combination on the devolatilization effect of chlorosulfonate polyethylene rubber were studied by means of numerical simulation and experimental research, and the technological process and operation parameters of the devolatilization production line of twin-screw extruder were optimized. Through the corresponding technical transformation, the co-directional twin-screw extruder has been successfully applied to the industrial production of chlorosulfonate polyethylene, which meets the production requirements of stable product quality and long cycle continuous operation. At present, this set of units has been able to operate for a long time and continuously produce superior products. The main results are as follows: (1) the flow field analysis of the kneading block structure of the co-directional twin-screw extruder shows that the high pressure zone of chlorosulfonated polyethylene melt is located on the propulsion surface of the kneading block screw edge, and the low pressure region is located on the back of the screw edge. Due to the existence of pressure difference, the volatile components in chlorosulfated polyethylene colloid form flash, and the volatile components in the colloid can be quickly removed. The mixing process of kneading block structure is mainly shear flow, and the tensile flow is mainly concentrated in the thrust surface of meshing disk screw edge and the region with low shear rate on the back. Among them, when the meshing blocks are arranged in the way of KB1, it is easier to form a larger pressure difference, and a higher proportion of the region in the flow field is in the tensile flow field, so it has a better devolatilization effect. (2) the experimental results show that the co-directional twin-screw extruder with reasonable screw combination has better devolatilization effect, and can produce two grades (CSM30 and CSM40) of chlorosulfated polyethylene rubber in the actual production. With the increase of cylinder temperature, the volatile components in chlorosulfated polyethylene are more easily removed, while increasing the screw speed shortens the residence time of glue in the cylinder, and the residual volatile matter increases gradually. (3) the experimental results show that the granulation cooling mode has a certain effect on the devolatilization effect. Using water cooling mode, trace water will enter into the rubber, which is disadvantageous to the removal of volatile matter, but air cooling is beneficial to devolatilization. (4) after adopting the co-directional twin-screw extruder and proper technical transformation, the output of chlorosulfonate polyethylene plant has been increased from 1000 tons / year to 2000 tons / year, and the excellent product rate of the product has reached 80%. At the same time, the consumption of carbon tetrachloride has not increased, which makes the environmental protection discharge meet the requirements. By increasing the output and product quality, not only the economic and environmental benefits are improved, but also the competitiveness and survivability of chlorosulfated polyethylene products are improved.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ325.12

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