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Process for reducing concentration of CO in low-temperature methanol wash tail gas

A low-temperature methanol washing and process technology, applied in the field of coal chemical industry, to achieve the effect of improving the recovery rate

Inactive Publication Date: 2019-07-12
CHINA TIANCHEN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the raw gas condensate dissolves effective gases such as CO and H2, and the classic low-formula process does not recover this part of effective gases

Method used

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  • Process for reducing concentration of CO in low-temperature methanol wash tail gas
  • Process for reducing concentration of CO in low-temperature methanol wash tail gas
  • Process for reducing concentration of CO in low-temperature methanol wash tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 A process for reducing CO concentration in low-temperature methanol scrubbing tail gas

[0030] Take the low-temperature methanol washing section of a 1 million-ton methanol plant as an example: the unit hour flow rate of CO and H2 in the raw material gas of the low-temperature methanol washing section is 275,000 Nm3. The composition of the CO component was 33.3% (V).

[0031] The water-containing feed gas washed with low-temperature methanol (pressure: 5.8MPaG, temperature: -25°C, the main components are CO, H2, CO2 and a small amount of water, methanol) first passes through the separator V1 to separate methanol aqueous solution (pressure: 5.75MPaG, Temperature: -25°C, the components are mainly methanol, water, and a small amount of dissolved CO, H2, CO2), the methanol aqueous solution at the bottom of the separator V1 first heats up to 60°C, and then reduces it to 0.8MPaG through the pressure reducing valve The flash gas sent to flash tank V8, V8 (pressure:...

Embodiment 2

[0033] Example 2 A process for reducing CO concentration in low-temperature methanol scrubbing tail gas

[0034] Take the low-temperature methanol washing section of a 1 million-ton methanol plant as an example: the unit hour flow rate of CO and H2 in the raw material gas of the low-temperature methanol washing section is 275,000 Nm3. The composition of the CO component was 33.3% (V).

[0035] The water-containing raw material gas washed with low-temperature methanol (the main components are CO, H2, CO2 and a small amount of water) is first injected with methanol, cooled to -15~-30°C by the raw gas cooler E1, and then separated by the separator V1 to separate the condensate (The temperature components are mainly methanol, water, and a small amount of dissolved CO, H2, and CO2). The condensate at the bottom of the separator V1 first passes through the feed heater E16, and the temperature rises to 60°C, and then reduces to 0.8MPaG through the pressure reducing valve. After that...

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Abstract

The invention relates to a process for reducing concentration of CO in low-temperature methanol wash tail gas. The process comprises main steps as follows: 1) flash evaporation is performed on a methanol water solution of low-temperature methanol wash, 2) flash evaporation gas is sent to a medium-pressure flash column and is washed by sulfur-free methanol to remove acidic components in the flash evaporation gas, 3)the flash evaporation gas is sent to a circulating gas compressor for recovery of effective gas. With a new technological process, energy in a system is ingeniously cycled and operated, useful substances are circularly utilized, CO and H2 in a raw gas condensation liquid and rich methanol are recovered in a flash evaporation pressurization manner, the CO recovery rate of the system can be increased by 0.2% or above, and the concentration of CO in the tail gas is reduced to 0.01 mol% or below.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a process method for reducing CO concentration in low-temperature methanol scrubbing tail gas. Background technique [0002] The low-temperature methanol washing section is widely used in new coal chemical projects due to its low energy consumption and large device processing capacity. At present, low-temperature methanol washing technology is mostly used in the acid gas removal section of large-scale coal chemical engineering projects. The low-temperature methanol washing device absorbs CO2 and H2S in the raw gas through methanol, and the purified gas is sent to the downstream device after reaching the standard. While methanol removes acid gases, it will absorb a small amount of effective gases such as H2 and CO. Especially, if CO in rich methanol cannot be fully recovered during medium-pressure flash evaporation, it will enter the tail gas during subsequent so...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/1418B01D53/1425B01D53/1462
Inventor 段宏悦李江川孙腾吴轩韬郭超靳权
Owner CHINA TIANCHEN ENG
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