Reclaiming device, method, and recovery unit of CO2, H2S, or both of CO2 and H2S

Patent metadata

Field	Value
Publication number	US-9901875-B2
Application number	US-201415027818-A
Country	US
Kind code	B2
Filing date	Oct 14, 2014
Priority date	Oct 18, 2013
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Provided are a reclaimer that introduces a part of an absorbent that has absorbed CO 2 or H 2 S in a flue gas through an introduction line and stores the absorbent, a heating section that heats the absorbent stored in the reclaimer to obtain recovered vapor, and a mixing tank disposed on the introduction line through which the absorbent is introduced into the reclaimer, and which introduces an absorbent (lean solution) and an alkaline agent for mixing thereof.

First claim

The invention claimed is:

1. A recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S, the recovery unit comprising:
an absorber configured to bring a gas containing CO 2 , H 2 S, or both of CO 2 and H 2 S, and an absorbent in contact to remove CO 2 , H 2 S, or both of CO 2 and H 2 S;
an absorbent regenerator configured to regenerate a rich solution that has absorbed CO 2 , H 2 S, or both of CO 2 and H 2 S to obtain a lean solution which is to be circulated and reused in the absorber;
a reclaimer configured to extract a part of the lean solution regenerated in the absorbent regenerator through an introduction line to remove a coexisting substance in the lean solution;
a heating section configured to heat the lean solution stored in the reclaimer to obtain recovered vapor;
a mixing tank interposed on the introduction line and configured to dilute and mix the lean solution and an alkaline agent with reflux water separated from a gas entraining CO 2 , H 2 S, or both of CO 2 and H 2 S in a top of the absorbent regenerator, to keep the uniform concentration distribution of each component and avoid solid deposition containing heat stable salts; and
a discharge line through which the recovered vapor discharged from the reclaimer is introduced into the absorbent regenerator.

2. The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 1 , comprising;
a first pH meter configured to measure a pH value of the lean solution in the introduction line;
a second pH meter configured to measure a pH value of a solution mixture in the mixing tank;
wherein the alkaline agent is added depending on a difference (Y−X) between (Y) which is the pH value of the second pH meter and (X) which is the pH value of the first pH meter.

3. The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 2 , wherein
the alkaline agent is added so that the difference (Y−X) between (Y) which is the pH value of the second pH meter and (X) which is the pH value of the first pH meter becomes “1” or more in an alkaline side.

4. The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 1 , comprising;
a gas-liquid separator provided in the discharge line and configured to separate a coexisting substance entrained in the recovered vapor; and
a cooler provided in the discharge line, and configured to cool the recovered vapor introduced into the gas-liquid separator.

5. The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 2 , comprising;
a gas-liquid separator provided in the discharge line and configured to separate a coexisting substance entrained in the recovered vapor; and
a cooler provided in the discharge line, and configured to cool the recovered vapor introduced into the gas-liquid separator.

6. The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 3 , comprising;
a gas-liquid separator provided in the discharge line and configured to separate a coexisting substance entrained in the recovered vapor; and
a cooler provided in the discharge line, and configured to cool the recovered vapor introduced into the gas-liquid separator.

7. The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 4 , wherein cooling water of the cooler is reflux water.

8. The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 5 , wherein cooling water of the cooler is reflux water.

9. The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 6 , wherein cooling water of the cooler is reflux water.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Tanaka Hiroshi
• Nagayasu Hiromitsu
• Hirata Takuya
• Yukumoto Atsuhiro
• Oishi Tsuyoshi
• Nakatani Shinsuke

Classifications

• C01B2203/0485

  the impurity being a sulfur compound · CPC title

• B01D53/18

  Absorbing units; Liquid distributors therefor (B01D3/16, B01D3/26, B01D3/30 take precedence; packing elements B01J19/30, B01J19/32) · CPC title

• C10L3/103

  Sulfur containing contaminants · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• B01D53/52

  Hydrogen sulfide · CPC title