【摘要】：在氯堿工業(yè)生產(chǎn)過程中,膜法除硝工藝是一種借助于選擇透過(半透過)性膜的功能,以壓力差為推動力的膜分離技術(shù)。本文通過對膜法除硝技術(shù)在離子膜燒堿工藝過程中的應(yīng)用進行了闡述,并對生產(chǎn)過程中出現(xiàn)的問題進了分析和改進。主要工作如下：1、離子膜燒堿工藝過程中,鹽水中的硫酸根來自原鹽本身和生產(chǎn)中產(chǎn)生的硫酸,它累積在系統(tǒng)中無法去除,它會影響離子膜電解槽的正常生產(chǎn)。為降低整個系統(tǒng)硫酸根含量,本論文通過除硝方法對比分析,確立了膜法除硝工藝的實際應(yīng)用可行性,并投入生產(chǎn)。2、針對膜法除硝冷凍離心單元的兌鹵槽原工藝過程中蒸發(fā)器壓力上升快,且沖洗效果不佳的問題進行數(shù)據(jù)采集和分析,通過工藝改造對裝置進行了優(yōu)化。3、膜法除硝的CIM膜運行周期較短,運行成本較高,本論文通過采用清洗、修復(fù)等技術(shù)延長了膜的使用壽命,一定程度上降低了膜的使用成本。4、工業(yè)園區(qū)中一期膜法除硝裝置產(chǎn)能不足,無法滿55萬噸／年離子膜燒堿的生產(chǎn)需要。本論文通過方案討論、成本對比、可行性分析研究,確立并利用原有的廠房和設(shè)備進行擴能增產(chǎn)項目,提升除硝處理能力,滿足了生產(chǎn)需要。5、工業(yè)園區(qū)膜法除硝裝置副產(chǎn)芒硝產(chǎn)量較大,外運成本較高,為降低經(jīng)濟成本,裝置采取加裝芒硝輸送皮帶機運送副產(chǎn)芒硝至新增收集池,統(tǒng)一定期外運,而且對加裝的皮帶機進行更優(yōu)化改造,既降低了運行成本,也提高了工作效率。6、膜法除硝兩套裝置共同運行時,公用部分管線存在結(jié)晶現(xiàn)象,導(dǎo)致設(shè)備運行不良。通過對管線進行分流改造、并加裝蒸汽管線,解決了運行中出現(xiàn)的問題,保證了設(shè)備的正常運行。
[Abstract]:In the process of chlor-alkali production, membrane denitrification is a kind of membrane separation technology, which is driven by pressure difference by means of selective (semi-permeable) membrane function. In this paper, the application of membrane denitrification in ionic membrane caustic soda process is described, and the problems in production are analyzed and improved. The main work is as follows: 1. In the process of ionic membrane caustic soda, the sulfate in brine comes from the raw salt itself and the sulfuric acid produced in production, which accumulates in the system can not be removed, it will affect the normal production of ionic membrane electrolyzer. In order to reduce the sulphate content in the whole system, the feasibility of the membrane denitrification process was established by comparing and analyzing the method of denitrification. And put into production. 2. In view of the problem that the evaporator pressure rises quickly and the washing effect is not good in the original process of membrane denitrification freezing centrifuge unit, the data is collected and analyzed. The operation period of CIM membrane with membrane denitrification is shorter and the running cost is higher. The service life of the membrane has been prolonged by cleaning and repairing technology in this paper. To a certain extent, the use cost of membrane is reduced by .4.The production capacity of the first stage membrane denitrification unit in the industrial park is insufficient to meet the production requirement of 550000 tons / a ionic membrane caustic soda. Through the project discussion, cost comparison, feasibility analysis and study, this paper establishes and uses the original plant and equipment for capacity expansion and production increase project to enhance the capacity of denitrification treatment. In order to reduce the economic cost, the equipment adopted the addition of belt conveyor to transport the by-product of mirabilite to the new collection pool, and to unify the regular shipping, the output of the by-product of the membrane nitrate removal plant in the industrial park was larger and the cost of shipping out was higher, so as to reduce the economic cost. Moreover, the belt machine is optimized and reformed, which not only reduces the running cost, but also improves the working efficiency. When the two sets of equipment are operated together, the common parts of the pipeline are crystallized, which leads to the poor operation of the equipment. The problems in operation are solved and the normal operation of the equipment is ensured by reconstructing the pipeline and installing the steam pipeline.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ114

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本文編號：2177063