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Study on the Simulation and Improvement of Two-step Rectisol Process

Author: ZhangShuangShuang
Tutor: ZhangShuWei
School: Dalian University of Technology
Course: Chemical processes
Keywords: Two-step method Rectisol Aspen Plus Insufficient cooling capacity Coke oven gas
CLC: TQ223.121
Type: Master's thesis
Year: 2010
Downloads: 359
Quote: 3
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Abstract


As information technology, environment and life sciences technology and the rapid development of materials science, chemical engineering research process is also expanding, encompasses everything from microscopic atoms, molecules synthesized to study global change, because of the complexity of the object ratio test and process simulation system faster, more efficient, lower cost advantages constantly emerge, along with analog technology continues to improve, the analog system has been widely appreciated and applied. This paper describes the low-temperature methanol carbon tower system in the process of coke oven gas and ammonia gas purification section of the application as well as rehabilitation programs for research. According to factory coke oven gas ammonia plant process production status Rectisol actual operation raised the issue for the study of the original methanol wash unit adaptable for actual production situation, the existing data on the basis of a detailed accounting of and further based on accounting results propose appropriate rehabilitation programs or measures. Device is the use of advanced general accounting process simulation software Aspen Plus software's. Aspen Plus software to conduct preliminary calculation based on the actual situation, and then on the basis of further proposed reform measures. Decarburization decarburization column system scene purification tower outlet excessive levels of carbon dioxide gas, in order to ensure the carbon dioxide content is not excessive, the actual production load only up to 70% of the design value. By using a common process simulation software for decarbonization tower system simulation analysis of the actual plant conditions proposed reform program. After the transformation process in the traditional process based on Lurgi decarburization decarburization tower bottoms increase circulation, namely the end of the liquid part of the Tata decarbonization ammonia intercooler cooled by re-entering the decarbonization tower tower reuptake CO2, improve the system CO2 in methanol solution saturation solve the actual production of the problem of insufficient cooling capacity, and production has reached full capacity. Pre-wash extraction problems azeotropic system is pre-wash tower of excessive levels of benzene in air tower, the ability to extract tight azeotropic azeotropic Tata bottom of benzene content seriously overweight, causing benzene was brought into subsequent systems benzene in subsequent systems continue to accumulate, affecting purified gas targets. Articles by simulation of the actual working conditions put forward in the raw gas into the pre-wash before adding a ammonia tower cooler, by lowering the temperature of the feed gas, not only out of the pre-scrubber tower reached the benzene content in gas process requirements, and reducing the amount of methanol washing, reducing the extraction column, the azeotropic tower capacity. Based on this, by adjusting the extraction tower, the azeotropic tower configuration parameters so that the bottom of the benzene azeotrope under control. By adopting a unified thermodynamic model Rectisol decarburization tower azeotropic extraction systems and pre-wash system to simulate actual working conditions and proposed reform program, to achieve the full load running. Two-step method Rectisol success of the system simulation, process simulation can be applied to prove that low-temperature methanol wash system process calculation, the actual production of the simulation analysis and optimization of operating conditions, the actual operation of the plant can provide a reliable technical support, to achieve increase production, reduce energy consumption and stable production, to achieve the best economic efficiency.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic alcohols (alcohols, hydroxy compounds) and its derivatives > Aliphatic alcohol > Fatty Alcohols > Methanol ( wood alcohol )
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