WO2016041154A1 - Procédé de traitement de gaz d'échappement - Google Patents

Procédé de traitement de gaz d'échappement Download PDF

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Publication number
WO2016041154A1
WO2016041154A1 PCT/CN2014/086698 CN2014086698W WO2016041154A1 WO 2016041154 A1 WO2016041154 A1 WO 2016041154A1 CN 2014086698 W CN2014086698 W CN 2014086698W WO 2016041154 A1 WO2016041154 A1 WO 2016041154A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
stage
tank
controlled
filter
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Application number
PCT/CN2014/086698
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English (en)
Chinese (zh)
Inventor
汪辉明
Original Assignee
汪辉明
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 汪辉明 filed Critical 汪辉明
Priority to PCT/CN2014/086698 priority Critical patent/WO2016041154A1/fr
Publication of WO2016041154A1 publication Critical patent/WO2016041154A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact

Definitions

  • the present invention relates to a method of treating exhaust gas, and more particularly to a method of treating exhaust gas containing an acid gas.
  • a primary object of the present invention is to provide a method of treating exhaust gas, comprising: an alkali wash absorption and a combined precipitation stage, using a timing controlled control valve system to direct the exhaust gas to be treated through a multi-directional feed fluid injection
  • the system enters a washing absorption unit containing an alkali solution to form a precipitate of a poorly soluble metal salt, and the upper clear solution is separated from the solid precipitation material by a solid-liquid separation device, and the clarified solution is sent back to the washing absorption unit by a circulation pump.
  • the solid portion and a small portion of the solution form a relatively wet slurry precipitate, and the slurry is sent to the sedimentation separation tank by the first transfer pump;
  • the slurry precipitate enters the settling separation tank from the top of the settling tank, and the heavier solid portion settles to the bottom of the tank of the settling tank.
  • the relatively clear solution in the upper layer flows into the clarification liquid tank through the solid-liquid separation device, and is then sent back to the washing absorption unit through the third transfer pump for recycling, and the concentrated slurry precipitate is sent to the program-controlled filter tank through the second transfer pump;
  • the concentrated slurry precipitate is pressurized and transported by the second transfer pump
  • the filter tank is filtered by the filter tube group
  • the concentrated slurry precipitate forms a filter cake.
  • the filter cake is adsorbed and thickened to appropriate conditions, the filter cake is peeled off by the gas pressure difference, and the filtrate portion is separated by the pressure difference.
  • the tubes are collected and sent to a sedimentation separation tank for recycling.
  • the above method wherein the pH of the lye is controlled to be in the range of 8 to 12.
  • the above method wherein the pH of the lye is controlled to be in the range of 10 to 12.
  • the above method wherein the pH of the lye is controlled to be in the range of 8 to 10.
  • the above method wherein the pH of the lye is controlled to be in the range of 9 to 11.
  • the mist removing device is further used to remove the mist in the exhaust gas from which the acidic substance has been removed.
  • the filter tube group used in the filtration separation stage has a pore size of 1 to 20 ⁇ m.
  • the filter tube group used in the filtration separation stage has a pore size of 5 to 15 ⁇ m.
  • the filter tube group used in the filtration separation stage has a pore size of 10 to 20 ⁇ m.
  • the filter cake containing the metal carbonate is further collected and resold to the cement plant as a hydrazine compound.
  • the above method wherein the metal carbonate-containing filter cake is further packaged using a guillotine cutting valve and a rotary blanking valve.
  • the method for treating exhaust gas of the present invention achieves the purpose of efficiently treating exhaust gas and recovering metal carbonate by integration of procedures.
  • FIG. 1 is a flow chart of a method of exhaust gas treatment of the present invention.
  • Fig. 2 is a view showing the procedure of the alkali washing absorption and the combined precipitation stage of the method for treating exhaust gas of the present invention.
  • Fig. 3 is a flow chart showing the stage of sedimentation separation of the method for treating exhaust gas of the present invention.
  • FIG. 4 is a sequence diagram of a filtration separation stage of the method of treating exhaust gas of the present invention.
  • the method for treating exhaust gas of the present invention is as shown in FIG. 1 , and comprises three stages: (1) alkali washing absorption and combined precipitation stage; (2) sedimentation separation stage; and (3) filtration separation stage, and detailed description of each stage. As after:
  • FIG. 2 is a process diagram of the alkali washing absorption and combined precipitation stage of the present invention. As shown in FIG. 2, this stage uses a timing control control valve system to guide the process exhaust gas to be treated or the exhaust gas after combustion through multi-directional feeding.
  • the fluid ejection system enters the wash absorption unit 01.
  • an alkali solution containing an alkaline earth metal ion is also introduced into the washing absorption unit 01.
  • the carbon dioxide (CO 2 ) gas contained in the exhaust gas is absorbed by the alkali solution to form a carbonate ion (CO 3 2- ) and an alkaline earth metal ion in the alkali solution to form a poorly soluble metal salt, and the poorly soluble metal salt is precipitated to The bottom of the absorption unit 01 is washed.
  • alkaline earth metal ions (M 2+ ions) are continuously added to the bottom of the tank of the washing and absorbing unit 01 to maintain the advantage, so that the alkaline earth metal ions can continuously combine with the carbonate ions to form a solid precipitate of MCO 3 .
  • the carbon dioxide content of 60 to 90 VOL% in the exhaust gas can be removed.
  • the relatively clear solution of the upper layer is separated from the solid precipitation material by a solid-liquid separation device, and the clarified solution is sent back to the washing absorption unit 01 by the circulation pump 07, and the exhaust gas from which the acid substance has been removed is circulated and rinsed.
  • the solid portion and a small portion of the solution form a relatively wet slurry deposit, which is sent to the settling separation tank 03 by the first transfer pump 08 for the next stage of processing.
  • Le Chatelier's principle absorption unit 01 may be washed sparingly soluble salts bottom product is removed continuously, continually shifting the equilibrium to the right; the same reactants, such as by OH - and M 2+ is constantly replenished, may cause accelerated toward balance
  • the right movement allows the system equipment to operate continuously without interruption, and can effectively handle a relatively large flow of exhaust gas containing acid gases (for example, CO 2 , SO 2 , NO 2 and H 2 S).
  • the exhaust gas of the acidic substance After being absorbed by the lye, the exhaust gas of the acidic substance has been removed, and after the mist is removed by the circulation rinsing and defogging device, the relatively clean treated gas is discharged to the atmosphere by the chimney after being monitored.
  • washing absorption units it is preferable to use two or more washing absorption units in parallel.
  • one of the washing and absorbing units fails or needs maintenance, at least another washing and absorbing unit can maintain normal operation, thereby avoiding exhaust gas treatment. The process is therefore shut down.
  • FIG. 3 is a sequence diagram of the sedimentation separation stage of the present invention.
  • the slurry transfer is pressure-fed to the settling separation tank 03 using the first transfer pump 08, wherein the slurry precipitate is sedimented.
  • the top of the separation tank enters the settling separation tank 03, and the heavier solid portion settles to the bottom of the tank of the settling separation tank 03.
  • the relatively clear solution in the upper layer flows into the clarified liquid tank 04 through the solid-liquid separation device, and is then pressurized and transported back to the washing and absorbing unit 01 by the third transfer pump 10 for recycling.
  • the concentrated slurry precipitate is sent to the programmed filter tank 05 via the second transfer pump 09 for the next stage of processing.
  • FIG. 4 is a sequence diagram of the sedimentation separation stage of the present invention.
  • the concentrated slurry precipitate is pressurized and transported to the programmable filter tank 05 via the second transfer pump 09, and has appropriate holes.
  • the filter tube group for example, 1 to 20 ⁇ m, 5 to 15 ⁇ m, 10 to 20 ⁇ m, etc.
  • the concentrated slurry precipitate forms a filter cake, and after the filter cake is adsorbed and thickened to appropriate conditions, the gas pressure difference is utilized.
  • the filter cake peeled off.
  • the filtrate portion is collected by the header using a pressure difference and sent to the sedimentation separation tank 03 for recycling.
  • the filter cake containing metal carbonate has a moisture content of about 40-60%. After being collected, it can be transported to a space bag for storage or clearing tank truck, and resold to a cement factory for use as a sputum compound. For applications such as wave block, water conservancy construction, and secondary road paving materials, it is possible to seal insoluble metal carbonates and the like in building materials, thereby effectively reducing the concentration of carbon dioxide in the atmosphere.
  • two or more program-controlled filter tanks connected in parallel may be used, and a metal carbonate-containing filter cake is packaged using a knife blanking valve and a rotary blanking valve.
  • the present invention fully complies with the three requirements of the patent: novelty, inventiveness, and practicality.
  • the method for treating exhaust gas of the present invention achieves the purpose of efficiently treating exhaust gas and recovering metal carbonate by integration of procedures; and in terms of industrial availability, the present invention
  • the method of exhaust gas treatment can fully meet the needs of the current industry.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

La présente invention concerne un procédé de traitement de gaz d'échappement. Le procédé comprend : une étape de lavage alcalin et d'absorption en combinaison avec un dépôt, une étape de dépôt et de séparation, et une étape de filtration et de séparation. Dans le procédé de traitement de gaz d'échappement, les objectifs de traitement efficace des gaz d'échappement et de récupération d'un carbonate de métal sont atteints par l'intégration de procédures.
PCT/CN2014/086698 2014-09-17 2014-09-17 Procédé de traitement de gaz d'échappement WO2016041154A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/086698 WO2016041154A1 (fr) 2014-09-17 2014-09-17 Procédé de traitement de gaz d'échappement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/086698 WO2016041154A1 (fr) 2014-09-17 2014-09-17 Procédé de traitement de gaz d'échappement

Publications (1)

Publication Number Publication Date
WO2016041154A1 true WO2016041154A1 (fr) 2016-03-24

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PCT/CN2014/086698 WO2016041154A1 (fr) 2014-09-17 2014-09-17 Procédé de traitement de gaz d'échappement

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WO (1) WO2016041154A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112675797A (zh) * 2019-10-18 2021-04-20 中国石油化工股份有限公司 碱洗塔及其应用以及在线分散碱洗塔中黄油的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1361711A (zh) * 1999-07-19 2002-07-31 株式会社荏原制作所 酸性气体洗涤装置及其方法
CN102711956A (zh) * 2010-01-22 2012-10-03 拉法基公司 降低废气中的二氧化碳浓度的方法
JP2013081873A (ja) * 2011-10-05 2013-05-09 Japan Coal Energy Center (Jcoal) 再活性化ある固体吸収剤のｃｏ２回収法
CN103752131A (zh) * 2012-06-04 2014-04-30 魏宇 反应釜废气回收技术
TW201434523A (zh) * 2013-03-05 2014-09-16 Hui-Ming Wang 燃燒後排氣或製程生產尾氣排放減除ｃｏ２等氣体之程序安排

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1361711A (zh) * 1999-07-19 2002-07-31 株式会社荏原制作所 酸性气体洗涤装置及其方法
CN102711956A (zh) * 2010-01-22 2012-10-03 拉法基公司 降低废气中的二氧化碳浓度的方法
JP2013081873A (ja) * 2011-10-05 2013-05-09 Japan Coal Energy Center (Jcoal) 再活性化ある固体吸収剤のｃｏ２回収法
CN103752131A (zh) * 2012-06-04 2014-04-30 魏宇 反应釜废气回收技术
TW201434523A (zh) * 2013-03-05 2014-09-16 Hui-Ming Wang 燃燒後排氣或製程生產尾氣排放減除ｃｏ２等氣体之程序安排

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112675797A (zh) * 2019-10-18 2021-04-20 中国石油化工股份有限公司 碱洗塔及其应用以及在线分散碱洗塔中黄油的方法
CN112675797B (zh) * 2019-10-18 2022-07-12 中国石油化工股份有限公司 碱洗塔及其应用以及在线分散碱洗塔中黄油的方法

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