Syngas cryogenic separation process combined with lithium bromide absorption refrigeration and organic Rankine cycle

被引：0
|
作者：
Li D. [1 ]
Yang S. [1 ]
Qian Y. [1 ]
机构：
[1] College of Chemistry and Chemical Engineering, South China University of Technology, Guangdong, Guangzhou
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 10期
关键词：
computer simulation; genetic algorithm; integration; lithium bromide absorption refrigeration; organic Rankine cycle;
D O I：
10.16085/j.issn.1000-6613.2022-0024
中图分类号：
学科分类号：
摘要：
The LNG separated from syngas by cryogenic liquefaction unit plays an important role in peak regulation, and significantly improves the economic benefits. However, the high energy consumption of cryogenic separation is a big problem in existing industries. In this paper, a cryogenic separation process coupled with lithium bromide absorption refrigeration and organic Rankine cycle was proposed. The waste heat is recovered from original compression refrigeration system, reducing the total refrigeration energy consumption. The compression stage was positively related to energy consumption and available waste heat. In order to minimize the energy consumption of the system, it was necessary to optimize the compression stages and the waste heat utilization system at the same time. The novel process of eight combination of compression stages was optimized by adaptive genetic algorithm. Then the lowest energy consumption was determined by comparing the total energy consumption, performance coefficient and unit energy consumption of each model. The results showed that the total energy consumption was reduced by 34% compared with the original process. The coefficient of performance was increased by 0.07, while the unit energy consumption was reduced by 0.89kW/kg. The economic performance showed that the novel process decreased operating cost by 33% and increased capital cost by 25.5 million. The capital cost can be recovered within one year, indicating the feasibility of novel process in economic. © 2022 Chemical Industry Press. All rights reserved.
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页码：5236 / 5246
页数：10
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