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A full-temperature pressure swing adsorption method for recovering hydrocarbons from low-temperature methanol scrubbing tail gas

A low-temperature methanol washing, pressure swing adsorption technology, applied in separation methods, chemical instruments and methods, gas treatment and other directions, can solve the problems of difficult TSA adsorption and regeneration cycle, difficult PSA adsorption, etc., to overcome the high energy consumption of regeneration, The effect of prolonging life and solving technical bottlenecks

Active Publication Date: 2018-06-05
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a full temperature-range pressure swing adsorption method for recovering hydrocarbons from low-temperature methanol scrubbing tail gas, which solves the difficulties of PSA adsorption and TSA adsorption and regeneration cycle of low-temperature methanol scrubbing tail gas at low pressure, normal temperature and extremely dilute hydrocarbon concentration. Achievement and other technical bottlenecks, overcome the contradiction between the traditional PSA and TSA adsorption and regeneration cycle, achieve energy saving and consumption reduction, prolong the life of the adsorption bed and other effects

Method used

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  • A full-temperature pressure swing adsorption method for recovering hydrocarbons from low-temperature methanol scrubbing tail gas

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 As shown, a full temperature range pressure swing adsorption (FTrPSA) method for recovering hydrocarbons from low-temperature methanol scrubbing tail gas, the steps of the method are as follows:

[0037] (1) Hydrocarbon adsorption and concentration process

[0038] a. The composition of low-temperature methanol scrubbing tail gas at atmospheric pressure is 0.6% of non-methane hydrocarbons (volume ratio, the same below), N 2 10.1%, CO 2 It is 88.0%, and the rest is 1.3%; the feed temperature is 40-50°C, and the feed flow rate is 600,000 cubic meters per hour;

[0039] b. After the low-temperature methanol washing tail gas passes through the fan and adjusts the pressure, it enters from the bottom of the adsorption tower and then adsorbs. The adsorption pressure is 40-50KPa, and the operating temperature is 40-50°C;

[0040] c. Unadsorbed CO 2 and part N 2 Discharged from the top of the adsorption tower, if the emission limit is less than 120mg / m3 sti...

Embodiment 2

[0051] On the basis of the full temperature range pressure swing adsorption (FTrPSA) method for recovering hydrocarbons from the low-temperature methanol tail gas described in Example 1, the raw gas composition and treatment capacity at normal pressure remain unchanged, and the temperature is 80-100°C, the fan adjusts the pressure to 60-70KPa, and enters the hydrocarbon adsorption and concentration process, which is carried out in a PSA system composed of 12 adsorption towers with an operating temperature of 80-100°C, an adsorption pressure of 60-70KPa, and 12 adsorption towers. The adsorption towers are connected in parallel with each other, the operating temperature is maintained in the range of 80-100°C, the operating pressure during adsorption is 60-70KPa, and the 12 adsorption towers are operated alternately to ensure that the raw material gas enters continuously. There are always 1-11 adsorption towers at The other adsorption towers are in the regeneration state.

[0052...

Embodiment 3

[0054] On the basis of the full temperature range pressure swing adsorption (FTrPSA) method for recovering hydrocarbons from the low-temperature methanol tail gas described in Example 1, the raw gas composition and treatment capacity at normal pressure remain unchanged, and the temperature is 140-150°C, the fan adjusts the pressure to 90-100KPa, and enters the hydrocarbon adsorption and concentration process, which is carried out in a PSA system consisting of an operating temperature of 140-150°C, an adsorption pressure of 90-100KPa, and 12 adsorption towers. The adsorption towers are connected in parallel with each other, the operating temperature is maintained in the range of 140-150°C, the operating pressure during adsorption is 90-100KPa, and the 12 adsorption towers are operated alternately to ensure that the raw material gas enters continuously. There are always 1-11 adsorption towers in the The other adsorption towers are in the regeneration state.

[0055] In this exam...

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Abstract

The invention discloses a full-temperature-process pressure swing adsorption method for recycling hydrocarbons from low-temperature methyl alcohol washing tail gas, and relates to the technical field of treatment of hydrocarbon-containing tail gas. The full-temperature-process pressure swing adsorption method comprises a hydrocarbons adsorption and concentration procedure and a hydrocarbons recycling procedure, wherein the hydrocarbons adsorption and concentration procedure comprises: performing evacuation and desorption under the adsorption pressure of 30 to 100 KPa and the operation temperature of 40 to 150 DEG C, discharging non-adsorbed CO2 and part of N2 from the top of an adsorption tower, and emptying the gas in place into the atmosphere; hydrocarbons components are evacuated and desorbed by a vacuum pump and then put into the hydrocarbons recycling procedure; in the hydrocarbons recycling procedure, a primary cooling unit, a secondary cooling unit, a cold alcohol absorption unit and a cold alcohol desorption unit are involved; heavy hydrocarbon components are separated after being subjected to secondary cooling, and other C2 and C3 hydrocarbon components are absorbed by the cold alcohol absorption unit with the operation pressure of 1.0 to 4.0 MPa and the operation temperature of (-20) to 20 DEG C, and then the cold alcohol desorption unit carries out desorption to obtain the C2 and C3 hydrocarbon components under normal pressure and the operation temperature of 20 to 40 DEG C.

Description

technical field [0001] The invention relates to the technical field of treating hydrocarbon-containing tail gas, and more specifically relates to a full temperature-range pressure swing adsorption method for recovering hydrocarbons from low-temperature methanol scrubbing tail gas. Background technique [0002] The most commonly used technology for removing acid gas components in coal chemical industry is low-temperature methanol washing. After low-temperature methanol washing, the tail gas is mainly carbon dioxide (CO2) and nitrogen (N2), and contains a small amount of hydrocarbons CmHn (CmHn is mainly carbon two (C2), and a small amount of carbon three (C3) and carbon four (C4) ), and the gas volume is huge, the calorific value is low, and it cannot be directly burned; a small amount of hydrocarbons cannot be discharged up to the standard, and the treatment is difficult; at present, this kind of tail gas is basically discharged directly, which brings great damage to the env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/047
CPCB01D53/047B01D2257/102B01D2257/504Y02C20/40
Inventor 刘开莉陈运蔡跃明钟雨明
Owner SICHUAN TECHAIRS
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