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Coupling method and system for low-temperature methanol washing technology and CO2 compressing technology

A low-temperature methanol washing, CO2 technology, applied in chemical instruments and methods, petroleum industry, carbon compounds, etc., can solve the problems of reducing operating costs, unreasonable energy utilization, and high process energy consumption, saving power consumption and improving energy utilization. rate effect

Active Publication Date: 2015-03-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The object of the present invention is to solve above-mentioned a kind of high CO 2 Yield of low-temperature methanol wash process in improving CO 2 To solve the process problems of unreasonable energy utilization and high process energy consumption during the yield, a low-temperature methanol washing process and CO 2 Coupling method and system of compression process, the method and system can 2 Under the condition of yield of product gas, rational use of cooling capacity and CO in the system 2 Heat during compression, reducing high CO 2 System energy consumption at capture rate, reducing operating costs

Method used

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  • Coupling method and system for low-temperature methanol washing technology and CO2 compressing technology
  • Coupling method and system for low-temperature methanol washing technology and CO2 compressing technology
  • Coupling method and system for low-temperature methanol washing technology and CO2 compressing technology

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Effect test

Embodiment 1

[0047] see figure 2 , the low-temperature methanol washing process of this embodiment and the CO 2 The coupling method of the compression process includes the following steps:

[0048] (1) Methanol barren solution 37 and H 2 The methanol rich liquid 22 and the CO at the bottom of the S concentration tower 19 2 The methanol rich liquid 16 at the bottom of the desorption tower 14 is transported to the top of the acid gas absorption tower 4 after heat exchange and cooling respectively;

[0049] (2) CO 2 After the methanol-rich liquid 16 at the bottom of the desorption tower 14 and the methanol-poor liquid 37 are heat-exchanged and heated, they are then mixed with CO 2 CO-enriched at the top of flash tower 50 2 Gas 51 conducts heat exchange to raise the temperature, and then with CO 2 Compressed CO at the end of a multi-stage compression unit 2 The product gas 66 is coupled and heated through a heat exchanger, and finally sent into the CO 2 Flash tower 50.

[0050] The l...

Embodiment 2

[0060] The low-temperature methanol washing process of the present embodiment and the CO 2 The coupling method and system of the compression process are the same as in Embodiment 1, the difference is that: CO 2 Yields vary and therefore corresponding operating temperatures also vary. details as follows:

[0061] see figure 2 , CO 2 The methanol-rich liquid 16 at the bottom of the desorption tower 14 enters the CO 2 Before the flash tower 50, it passes through heat exchangers 56, 53, and 60 to fully recover and utilize the low-temperature cooling capacity generated in the desorption process. After passing through heat exchanger 56, the operating temperature is -33°C, and after passing through heat After that, the operating temperature is -26°C, after passing through the heat exchanger 60, the operating temperature is -5°C, CO 2 The operating pressure of the flash column 50 is 1.7 bar. CO 2 CO rich 2 Gas 51 is transported to CO after being pressurized and cooled 2 At ...

Embodiment 3

[0065] see image 3 , the low-temperature methanol washing process of this embodiment and the CO 2 The coupling method of the compression process includes the following steps:

[0066] (1) Methanol barren solution 37 and H 2 The methanol rich liquid 22 and the CO at the bottom of the S concentration tower 19 2 The methanol rich liquid 16 at the bottom of the desorption tower 14 is transported to the top of the acid gas absorption tower 4 after heat exchange and cooling respectively;

[0067] (2) CO 2 After the methanol-rich liquid 16 at the bottom of the desorption tower 14 and the methanol-poor liquid 37 are heat-exchanged and heated, they are then mixed with CO 2 Compressed CO at the end of a multi-stage compression unit 2 The product gas 66 is coupled to heat up through a heat exchanger, and then with CO 2 The circulating water hot end 71 in the multi-stage compression device performs heat exchange to raise the temperature, and finally sends the CO 2 Flash tower 50. ...

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Abstract

The invention discloses a coupling method and a system for low-temperature methanol washing technology and CO2 compressing technology. A CO2 flash evaporation tower is arranged between the bottom of a CO2 desorption tower and a H2S concentration tower in the low-temperature methanol washing technology. A CO2 multi-stage compression apparatus and a pump pressurizing apparatus are provided for the CO2 compressing technology. The coupling method comprises the following steps: performing coupling on a methanol-rich solution at the CO2 desorption tower bottom and compressed CO2 product gas at the end of the CO2 multi-stage compression apparatus by a heat exchanger, sending the coupled methanol-rich solution into the CO2 flash evaporation tower, and cooling the coupled compressed CO2 product gas to obtain a liquid CO2 product and performing pressurization conveying by the pump pressurizing apparatus. According to the method and the system, the heat generated in the CO2 compressing process is reutilized for providing a methanol-rich solution temperature-raising heat source for enhancing CO2 desorption in the low-temperature methanol washing process, also the cold energy of the methanol-rich solution at the bottom of the CO2 desorption tower is utilized, and thus the refrigeration power consumption in the compressing process is saved and the energy utilization rate is raised.

Description

technical field [0001] The invention relates to the field of gas purification and the field of greenhouse gas emission reduction, in particular to a low-temperature methanol washing process and CO 2 Coupling method and system for compression process. Background technique [0002] CO 2 The total amount of emissions has increased substantially in the past 100 years, resulting in a significant increase in the global average temperature. The greenhouse effect has become one of the most serious environmental problems facing mankind in the 21st century. CO produced and emitted during the utilization of coal, petroleum and other fossil fuels 2 Separation and recovery, storage and utilization (CCS&CCUS) have attracted widespread attention from all over the world. [0003] The modern coal chemical technology led by coal gasification has become an important direction of coal clean utilization, which has the advantages of high thermal utilization efficiency of coal, low operating co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10K1/16C01B31/20C01B32/50
Inventor 钱宇刘霞杨思宇
Owner SOUTH CHINA UNIV OF TECH
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