Reclaiming device, method, and recovery unit of co2, h2s, or both of co2 and h2s

Patent metadata

Field	Value
Publication number	US-2016288049-A1
Application number	US-201415027818-A
Country	US
Kind code	A1
Filing date	Oct 14, 2014
Priority date	Oct 18, 2013
Publication date	Oct 6, 2016
Grant date	—

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

1 - 9 . (canceled)

10 . 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; 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 disposed on the introduction line and configured to introduce the lean solution and an alkaline agent for mixing thereof; and a discharge line through which the recovered vapor discharged from the reclaimer is introduced into the absorbent regenerator, wherein the lean solution regenerated in the absorbent regenerator is circulated and reused in the absorber; the recovered vapor recovered from the reclaimer is introduced into the absorbent regenerator through the discharge line; and reflux water separated from a CO 2 -entrained gas in a top of the absorbent regenerator is introduced into the mixing tank to dilute and mix the lean solution and the alkaline agent.

11 . The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 10 , 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.

12 . The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 11 , 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.

13 . The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 10 , 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.

14 . The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 11 , 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.

15 . The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 12 , 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.

16 . The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 13 , wherein cooling water of the cooler is reflux water.

17 . The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 14 , wherein cooling water of the cooler is reflux water.

18 . The recovery unit of CO 2 , H 2 S, or both of CO 2 and H 2 S according to claim 15 , 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

• Y02A50/20

  Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters · CPC title

• B01D53/78 Primary

  with gas-liquid contact · CPC title

• C10L2290/60

  Measuring or analysing fractions, components or impurities or process conditions during preparation or upgrading of a fuel · CPC title

• B01D53/1425

  Regeneration of liquid absorbents · CPC title

• B01D53/1493

  Selection of liquid materials for use as absorbents · CPC title