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Low temperature methanol wash method and equipment

A low-temperature methanol washing and methanol technology, which is applied in the purification, treatment and recovery of natural gas and other carbonyl gases, and the field of coal-to-gas, can solve problems such as only 98%, and achieve the effect of reducing equipment power consumption and increasing recovery rate.

Active Publication Date: 2012-06-13
HUANENG CLEAN ENERGY RES INST
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Problems solved by technology

Therefore, the recovery rate of purified gas, especially CO, is generally only about 98%.

Method used

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  • Low temperature methanol wash method and equipment
  • Low temperature methanol wash method and equipment
  • Low temperature methanol wash method and equipment

Examples

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Embodiment 1

[0073] Preparation method: the following combined with figure 2 with 3 , the low-temperature methanol washing method of the present invention is further described:

[0074] The first lean methanol solution 30 is combined with the spray methanol 30 and the circulating gas 29 for the first absorption to form a gas-liquid mixture. The gas-liquid mixture is cooled to about -12.0°C by the feed gas cooler 1 to form the first rich The methanol solution 34, the first methanol-rich solution 34 enters the gas-liquid separator 2, and after separation and dehydration, a first gas and a first liquid 36 are generated. The first liquid 36 passes through the methanol-water separation tower 27 to remove water and generate methanol vapor for recovery. The first gas enters the methanol washing tower 4, and uses the second lean methanol solution 51 flowing down from the top of the tower to complete the decarburization treatment in the upper decarburization section of the tower to generate a se...

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Abstract

The invention discloses a low temperature methanol wash method and equipment, wherein the method comprises an absorption step, a desorption step and a methanol heat regeneration step. The absorption step further comprises: adopting first lean methanol solution to absorb virgin gas for the first time, and cooling to form first rich methanol solution; forming first gas and first liquid after gas-liquid separation; adopting second lean methanol solution to absorb the first gas for a second time, and forming second absorbed rich methanol solution after the second lean methanol solution is absorbed for a second time; carrying out flash distillation on the second absorbed rich methanol solution to form second gas and flash distillated rich methanol solution; and adopting third lean methanol solution to absorb the second gas for a third time, forming third gas and reflux rich methanol solution, and respectively recycling the third gas and the reflux rich methanol solution. The method can be high-efficient, flexible, safely and energy-saving to treat carbonyl gas with different pressures, temperatures, moisture contents and sulphur concentrations.

Description

technical field [0001] The invention relates to the field of purification, treatment and recovery of coal-based gas, natural gas and other carbonyl gases, in particular to a low-temperature methanol washing method and equipment. Background technique [0002] The low-temperature methanol washing process is a purification process developed in the 1950s and put into industrial production. It is mainly used to purify the synthesis gas produced from coal, coal water slurry, slag, or heavy oil. At present, the low-temperature methanol washing process has been widely used in the gas purification process for the production of synthetic ammonia, synthetic methanol, coal-to-natural gas, city gas, and industrial hydrogen production. [0003] exist figure 1 An existing low-temperature methanol washing process flow is given in , including the steps of absorption, desorption and methanol thermal regeneration, which will be referred to below figure 1 Further illustrate the situation of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/18C10K1/16
Inventor 许世森郜时旺王保民
Owner HUANENG CLEAN ENERGY RES INST
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