Application and Optimization of Liquid Expander in Rectisol Process

QU Yaopeng; SONG Peng; SUN Jinju

doi:10.7652/xjtuxb202504019

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Application and Optimization of Liquid Expander in Rectisol Process

更新时间：2026-01-06

- Application and Optimization of Liquid Expander in Rectisol Process
- Journal of Xi’an Jiaotong University Vol. 59, Issue 4, Pages: 203-212(2025)
- 作者机构：
  
  西安交通大学能源与动力工程学院， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202504019
  CLC： TQ546.5
- Received：12 November 2024，
  
  Online First：30 December 2024，
  
  Published：10 April 2025
- 稿件说明：
移动端阅览
QU Yaopeng, SONG Peng, SUN Jinju. Application and Optimization of Liquid Expander in Rectisol Process[J]. Journal of Xi’an Jiaotong University, 2025, 59(4): 203-212.
DOI：

QU Yaopeng, SONG Peng, SUN Jinju. Application and Optimization of Liquid Expander in Rectisol Process[J]. Journal of Xi’an Jiaotong University, 2025, 59(4): 203-212. DOI： 10.7652/xjtuxb202504019.

摘要

为降低低温甲醇洗工艺能耗，提高CO

捕获量，提出在不同位置使用液体膨胀机替换节流阀的方案。采用Aspen Plus软件模拟传统低温甲醇洗工艺（方案0），物性方法选用CPA（cubic-plus-association）模型，使用实验数据回归的二元交互参数进行修正，结果发现主

要流股与实际数据的标准偏差均小于1%。使用富碳膨胀机、富硫膨胀机、同时使用富碳/富硫膨胀机替换节流阀（方案1~3）以改进工艺。以敏感性参数为优化变量，综合考虑热能、冷能和电能的不同品位，以单位CO

捕获能耗最低为目标优化工艺参数，得到优化后的方案1~3。与使用节流阀的工艺进行比较，结果表明：方案1~3使单位CO

产品能耗分别降低了11.75%、12.38%和22.90%，优化后的方案1~3进一步降低了6.05%、5.59%和4.47%；方案1~3的㶲效率分别提高了1.23%、1.23%和2.48%，优化后进一步提高了0.20%、0.15%和0.15%；不同位置的膨胀机均能带来经济收益，不同的是，优化后方案小幅提高了富硫膨胀机的收益，但大幅降低了富碳膨胀机的收益。该研究可为液体膨胀机的工业化应用提供借鉴。

Abstract

To reduce the energy consumption of the rectisol process and increase CO

capture

scenarios are proposed to use a liquid expander at different locations to replace the throttle valve. Aspen Plus software simulates the traditional rectisol process (scenario 0). The physical method selects the CPA (cubic-plus-association) model and corrects it using binary interaction parameters regressed on experimental data

with standard deviations of the main flow strands from actual data below 1%. Throttle valves are then replaced with a carbon-rich expander

a sulfur-rich expander

and both carbon-rich/sulfur-rich expanders (scenarios 1—3) to enhance the process. Subsequently

sensitivity parameters serve as optimization variables

considering varying levels of heat

cold

and electricity

optimizing process parameters with the objective of overall energy consumption per unit of CO

product

and obtaining the corresponding optimization scenarios. Results show that applying the liquid expander (scenarios 1—3) reduces energy consumption per unit of CO

product by 11.75%

12.38%

and 22.90%

respectively

compared to using a throttle valve; further reductions of 6.05%

5.59%

and 4.47% are achieved post-optimization. Exergy efficiency increases by 1.23%

1.23%

and 2.48% for scenarios 1—3

respectively; post-optimization

it further increases by 0.20%

0.15%

and 0.15%. Economic analysis indicates that different expander positions all yield gains

with optimization slightly boosting profits of the sulfur-rich expander but significantly reducing profit

s of the carbon-rich expander. This research can provide a reference for the industrial application of liquid expanders.

关键词

Keywords

references

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