Unlock instant, AI-driven research and patent intelligence for your innovation.

Desorption method for recovery of low-concentration adsorbed phase and non-adsorbed phase components by psa

A non-adsorption, phase component technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as increased PSA load, reduced pressure utilization of adsorption towers, and reduced adsorption efficiency

Active Publication Date: 2021-06-04
ZHEJIANG TIANCAIYUNJI TECH CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a desorption method for recovering low-concentration adsorption phase and non-adsorption phase components of PSA, aiming at the huge circulation volume of its products as replacement gas in the replacement step of low-concentration adsorption phase existing in the desorption process of existing PSA The product gas yield of the adsorption phase components is low, the purity is low, and the energy consumption is high. The reverse pressure and final filling steps rely on the product gas of the non-adsorption phase components to pressurize the product gas yield of the non-adsorption phase components. Low, increased PSA load to obtain product gas in the adsorption phase, reduced adsorption efficiency, and reduced effective pressure utilization between adsorption towers during the non-adsorbed phase PSA cycle

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Desorption method for recovery of low-concentration adsorbed phase and non-adsorbed phase components by psa
  • Desorption method for recovery of low-concentration adsorbed phase and non-adsorbed phase components by psa
  • Desorption method for recovery of low-concentration adsorbed phase and non-adsorbed phase components by psa

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 1 Shown, a kind of PSA reclaims the desorption method of low concentration adsorption phase and non-adsorption phase component, comprises the steps:

[0041] (1) The components are 44.6% (volume ratio, the same below) H2, 12.5% ​​C2+, 25.5% CH4, 14.4% N2 and 3% other impurities, the pressure is 1.5MPa, the temperature is 60°C, and the flow rate is 10,000 standard The raw material gas composed of cubic meters per hour enters the pressure transformation of the first section of 6 towers consisting of adsorption, forward discharge, reverse discharge I, reverse discharge II / vacuumization, flushing, reverse pressure charging, forward pressure charging and final charging steps The adsorption system (1#PSA) performs adsorption, wherein the hydrogen gas flowing out of the non-adsorbed phase gas has a purity greater than or equal to 99%, and a yield greater than or equal to 80%, which is output as the product gas of the non-adsorbed phase component.

[0042] (2) A...

Embodiment 2

[0055] Such as figure 2 Shown in (dotted line), on the basis of the desorption method that a kind of PSA described in embodiment 1 reclaims low-concentration adsorption phase and non-adsorption phase components, the replacement gas of described 2#PSA replacement step can also come from through The product gas of the adsorption phase component of the pressurized 2#PSA is used as a supplement or switch for standby. Moreover, a part of the replacement waste gas can enter the intermediate tank, so that the gas can continuously enter the pressurization and membrane separation system, or continuously perform reverse pressure to the adsorption tower in the reverse pressure step in 2#PSA.

Embodiment 3

[0057] Such as figure 1 Shown, on the basis of the desorption method that a kind of PSA described in embodiment 1 reclaims low-concentration adsorption phase and non-adsorption phase components, described from the permeation of the membrane separation system between 1#PSA and 2#PSA gas, the pressure drops to 0.3-0.4MPa, and enters the second stage of the 5-tower pressure swing adsorption system ( 2#PSA) for adsorption, the adsorption pressure is 0.3-0.4MPa, the obtained non-adsorbed phase gas is pressurized to 2.0MPa, mixed with raw material gas, enters 1#PSA to continue adsorption, the adsorption pressure is 2.0MPa, and further recovery 2 H2 and C2+ in the non-adsorption phase gas of #PSA; The non-permeable gas is depressurized to 0.3~0.4MPa through the pressure reducing valve, and is used as the replacement gas to replace the adsorption tower in the replacement step in 2#PSA, thereby Realize the difference in the two-stage PSA adsorption pressure.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a desorption method for PSA to recover low-concentration adsorption phase and non-adsorption phase components, and relates to the technical field of gas separation from PSA, including reverse discharge I and reverse discharge II of the 1# PSA desorption process and reverse discharge of the washing step The discharge gas and flushing gas enter the membrane separation system composed of intermediate tanks, compressors and membrane separation unit components between 1#PSA and 2#PSA, wherein the non-permeable gas is used as the replacement required for the replacement step of 2#PSA desorption gas replacement. This method solves the low gas yield, low purity and high energy consumption of the adsorption phase components caused by the low concentration adsorption phase replacement step in the existing PSA desorption process. When the reverse pressure and final filling steps rely on the product gas of the non-adsorbed phase components for pressurization, the yield of the product gas of the non-adsorbed phase components is low, the PSA load of the product gas obtained by the adsorption phase increases, and the adsorption efficiency decreases.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and more specifically relates to a desorption method for PSA recovery of low-concentration adsorption phase and non-adsorption phase components. Background technique [0002] Pressure swing adsorption (PSA) separation technology means that at a certain temperature, the adsorption capacity of a specific adsorbent to the adsorbate in the feed gas increases at a higher pressure; on the contrary, the adsorption capacity decreases at a lower pressure. Under higher pressure, the adsorbent first adsorbs the adsorbate, and then lowers the pressure to desorb and release the adsorbed adsorbate, so that the adsorbent is regenerated. [0003] For PSA whose purpose is to obtain non-adsorbed phase components, the desorption process generally consists of forward / reverse discharge, reverse discharge / vacuumization, flushing, forward / reverse pressure charging, final charging, etc. The process of pressure c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/047
CPCB01D53/047
Inventor 汪兰海陈运唐金财钟雨明蔡跃明
Owner ZHEJIANG TIANCAIYUNJI TECH CO LTD