CN109482590B - Online cleaning process for tail gas absorption tower of caustic soda device - Google Patents

Online cleaning process for tail gas absorption tower of caustic soda device Download PDF

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Publication number
CN109482590B
CN109482590B CN201811280798.4A CN201811280798A CN109482590B CN 109482590 B CN109482590 B CN 109482590B CN 201811280798 A CN201811280798 A CN 201811280798A CN 109482590 B CN109482590 B CN 109482590B
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Prior art keywords
valve
absorption tower
circulating
pure water
steam
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CN201811280798.4A
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CN109482590A (en
Inventor
叶得强
王金峰
董尚志
苏青天
李刚
沙剑
于凤刚
饶栋
辛丹
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Jinchuan Group Chemical New Materials Co ltd
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Jinchuan Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • 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
    • B01D53/68—Halogens or halogen compounds
    • 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
    • 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
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/304—Alkali metal compounds of sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/20—Halogens or halogen compounds
    • B01D2257/202—Single element halogens
    • B01D2257/2025—Chlorine

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention provides an on-line cleaning process for a tail gas absorption tower of a caustic soda device, which comprises an alkali liquor circulation tank, a number 1 valve, a circulation pump, a heat exchanger, an absorption tower, a number 2 valve, a pure water tank, a number 3 valve, a circulation water inlet valve, a circulation water outlet valve, a steam inlet valve, a steam outlet valve, a number 4 valve and a distribution table. Through utilizing former equipment, add pure water groove, steam conduit, carry out online cleaning for the pure water heating to the absorption tower, avoided the absorption tower at the operation situation that the operation can't be operated because of the jam of sodium chloride crystal, saved maintenance time, guaranteed system safety in production.

Description

Online cleaning process for tail gas absorption tower of caustic soda device
Technical Field
The invention belongs to the field of chemical technology, and relates to a technology for cleaning a tail gas absorption tower of a caustic soda device.
Background
Among the ionic membrane caustic soda device, in order to reach the environmental protection requirement, through setting up the tail gas absorption tower, utilize the caustic soda to absorb stray chlorine, but along with progressively going on of absorption process, formed a large amount of sodium chloride salt water, because sodium chloride forms the crystallization easily, lead to each mouth of pipe crystallization of absorption tower to block up, cause the absorption tower to become invalid, brought very big potential safety hazard to the normal production of system.
Disclosure of Invention
The invention aims to provide an on-line cleaning process which is simple and easy to implement and convenient to operate, aiming at the problem that sodium chloride crystals are easy to generate to block a pipe orifice in the absorption process of an absorption tower, and the safe, continuous and stable operation of the absorption tower is guaranteed.
The purpose of the invention is realized by the following technical scheme: an online cleaning process for a tail gas absorption tower of a caustic soda device comprises an alkali liquor circulating tank, 1# valves, a circulating pump, a heat exchanger, an absorption tower, 2# valves, a pure water tank, 3# valves, a circulating water inlet valve, a circulating water outlet valve, a steam inlet valve, a steam outlet valve, 4# valves and a distribution table; the alkali liquor circulating tank is communicated with the pure water tank through a distribution table and is respectively provided with a number 1 valve and a number 3 valve; the circulating pump is communicated with the distribution table and is positioned between the 1# valve and the 3# valve; a circulating water inlet of the heat exchanger is connected to a circulating water inlet valve and a steam inlet valve, and the circulating water inlet valve is communicated with the steam inlet valve; the circulating water outlet is connected to a circulating water outlet valve and a steam outlet valve, the circulating water outlet valve is communicated with the front of the steam outlet valve, a liquid outlet of the circulating pump is communicated with a heat exchange liquid inlet, and a heat exchange liquid outlet is communicated with a feed inlet of the absorption tower; the bottom of the absorption tower is respectively communicated with an alkali liquor circulating tank and a pure water tank, and a 2# valve and a 4# valve are respectively arranged on the communicating pipelines;
the method comprises the following operation steps: A. in the normal operation process of the absorption tower, opening the 1# valve, the circulating water inlet valve, the circulating water outlet valve and the 3# valve, closing the 2# valve, the steam inlet valve, the steam outlet valve and the 4# valve, starting a circulating pump, conveying alkali liquor from an alkali liquor circulating tank to the absorption tower to absorb stray chlorine gas to form sodium chloride brine and returning the sodium chloride brine to the alkali liquor circulating tank, and using a heat exchanger to reduce the temperature of the alkali liquor after chlorine gas is absorbed in the absorption process;
B. when the absorption tower is blocked by sodium chloride crystals, closing the 1# valve, the circulating water inlet valve and the 3# valve, opening the 2# valve, the steam inlet valve, the steam outlet valve and the 4# valve, starting the circulating pump, enabling pure water to flow through the distribution table from the pure water tank, conveying the pure water to the heat exchanger through the circulating pump, heating the pure water by steam to reach the absorption tower, dissolving and cleaning the sodium chloride crystals generated in the absorption tower by the high-temperature pure water, and finally returning the pure water to the pure water tank through the 4# valve.
The heat exchanger is a plate heat exchanger.
The invention has the beneficial effects that: through utilizing former equipment to add pure water groove, steam conduit, carry out online cleaning for the pure water heating to the absorption tower, avoided the absorption tower at the situation that the operation process can't be operated because of the jam of sodium chloride crystal, saved the repair time, guaranteed system safety in production.
Drawings
FIG. 1 is a process line drawing of the present invention; in the figure: 1-an alkali liquor circulating tank; 2-1# valves; 3-a circulating pump; 4-a heat exchanger; 5-an absorption tower; 6-2# valves; 7-a pure water tank; 8-3# valves; 9-circulating water inlet valve; 10-a circulating water outlet valve; 11-a vapour inlet valve; 12-a steam outlet valve; 13-4# valves; 14-dispensing station.
Detailed Description
An online cleaning process for a tail gas absorption tower of a caustic soda device comprises an alkali liquor circulating tank 1, a No. 1 valve 2, a circulating pump 3, a heat exchanger 4, an absorption tower 5, a No. 2 valve 6, a pure water tank 7, a No. 3 valve 8, a circulating water inlet valve 9, a circulating water outlet valve 10, a steam inlet valve 11, a steam outlet valve 12, a No. 4 valve 13 and a distribution table 14; the alkali liquor circulating tank 1 is communicated with the pure water tank 7 through a distribution table 14 and is respectively provided with a number 1 valve 2 and a number 3 valve 8; the circulating pump 3 is communicated with the distribution table 14 and is positioned between the No. 1 valve 2 and the No. 3 valve 8; the heat exchanger 4 is a plate heat exchanger, a circulating water inlet of the heat exchanger is connected to a circulating water inlet valve 9 and a steam inlet valve 11, and the circulating water inlet valve 9 is communicated with the steam inlet valve 11 after being opened; the circulating water outlet is connected to a circulating water outlet valve 10 and a steam outlet valve 12, the circulating water outlet valve 10 is communicated with the front of the steam outlet valve 12, the liquid outlet of the circulating pump 3 is communicated with the heat-exchange liquid inlet, and the heat-exchange liquid outlet is communicated with the feed inlet of the absorption tower 5; the bottom of the absorption tower 5 is respectively communicated with an alkali liquor circulating tank 1 and a pure water tank 7, and a 2# valve 6 and a 4# valve 13 are respectively arranged on the communicating pipelines;
the method comprises the following operation steps: A. in the normal operation process of the absorption tower 5, opening the No. 1 valve 2, the circulating water inlet valve 9, the circulating water outlet valve 10 and the No. 3 valve 8, closing the No. 2 valve 6, the steam inlet valve 11, the steam outlet valve 12 and the No. 4 valve 13, starting the circulating pump 3, conveying alkali liquor from the alkali liquor circulating tank 1 to the absorption tower 5 to absorb stray chlorine gas to form sodium chloride brine and returning the sodium chloride brine to the alkali liquor circulating tank, and using the heat exchanger 4 to reduce the temperature of the alkali liquor after absorbing the chlorine gas in the absorption process;
B. when the absorption tower 5 is blocked by sodium chloride crystals, the 1# valve 2, the circulating water inlet valve 9, the circulating water inlet valve 10 and the 3# valve 8 are closed, the 2# valve 6, the steam inlet valve 11, the steam outlet valve 12 and the 4# valve 13 are opened, the circulating pump 3 is started, pure water flows through the distribution table 14 from the pure water tank 7, is conveyed to the heat exchanger 4 through the circulating pump 3, reaches the absorption tower 5 after being heated and warmed by steam, and is dissolved and cleaned by high-temperature pure water, and finally returns to the pure water tank 7 through the 4# valve 13.

Claims (2)

1. An online cleaning process for a tail gas absorption tower of a caustic soda device is characterized in that the used device comprises an alkali liquor circulating tank (1), 1# valves (2), a circulating pump (3), a heat exchanger (4), an absorption tower (5), 2# valves (6), a pure water tank (7), 3# valves (8), a circulating water inlet valve (9), a circulating water outlet valve (10), a steam inlet valve (11), a steam outlet valve (12), 4# valves (13) and a distribution table (14); the alkali liquor circulating tank (1) is communicated with the pure water tank (7) through a distribution table (14), and is respectively provided with a number 1 valve (2) and a number 3 valve (8); the circulating pump (3) is communicated with the distribution table (14) and is positioned between the 1# valve (2) and the 3# valve (8); a circulating water inlet of the heat exchanger (4) is connected to a circulating water inlet valve (9) and a steam inlet valve (11), and the circulating water inlet valve (9) is communicated with the steam inlet valve (11) after being opened; the circulating water outlet is connected to a circulating water outlet valve (10) and a steam outlet valve (12), the circulating water outlet valve (10) is communicated with the front of the steam outlet valve (12), the liquid outlet of the circulating pump (3) is communicated with the heat exchange liquid inlet, and the heat exchange liquid outlet is communicated with the feed inlet of the absorption tower (5); the bottom of the absorption tower (5) is respectively communicated with the alkali liquor circulating tank (1) and the pure water tank (7), and the communicating pipelines are respectively provided with a 2# valve (6) and a 4# valve (13);
the method comprises the following operation steps: A. in the normal operation process of the absorption tower (5), opening a 1# valve (2), a circulating water inlet valve (9), a circulating water outlet valve (10) and a 3# valve (6), closing a 2# valve (8), a steam inlet valve (11), a steam outlet valve (12) and a 4# valve (13), starting the circulating pump (3), conveying alkali liquor to the absorption tower (5) from the alkali liquor circulating tank (1) to absorb stray chlorine gas to form sodium chloride brine and returning the sodium chloride brine to the alkali liquor circulating tank, and using the heat exchanger (4) to reduce the temperature of the alkali liquor after absorbing the chlorine gas in the absorption process;
B. when the absorption tower (5) is blocked by sodium chloride crystals, the 1# valve (2) is closed, the circulating water inlet valve (9), the circulating water inlet valve (10) and the 3# valve (6) are opened, the 2# valve (8) is opened, the steam inlet valve (11), the steam outlet valve (12) and the 4# valve (13) are opened, the circulating pump (3) is started, pure water flows through the distribution table (14) from the pure water tank (7) and is conveyed to the heat exchanger (4) through the circulating pump (3), the pure water reaches the absorption tower (5) after being heated and warmed by steam, the sodium chloride crystals generated in the absorption tower (5) are dissolved and cleaned by the high-temperature pure water, and finally the pure water returns to the pure water tank (7) through the 4# valve (13).
2. The process for the on-line cleaning of the tail gas absorption tower of the caustic soda plant as claimed in claim 1, characterized in that the heat exchanger (4) is a plate heat exchanger.
CN201811280798.4A 2018-10-30 2018-10-30 Online cleaning process for tail gas absorption tower of caustic soda device Active CN109482590B (en)

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CN201811280798.4A CN109482590B (en) 2018-10-30 2018-10-30 Online cleaning process for tail gas absorption tower of caustic soda device

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Application Number Priority Date Filing Date Title
CN201811280798.4A CN109482590B (en) 2018-10-30 2018-10-30 Online cleaning process for tail gas absorption tower of caustic soda device

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CN109482590B true CN109482590B (en) 2021-08-27

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204151420U (en) * 2014-08-25 2015-02-11 江阴济化新材料有限公司 The on-line cleaning device of crystallizer in flush acid system
CN205990248U (en) * 2016-08-29 2017-03-01 金川集团股份有限公司 A kind of salt water conveying system having from cleaning function
CN107569994A (en) * 2017-09-29 2018-01-12 禹州市维立特化工有限公司 A kind of alkali liquor absorption tower with filler back purge system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017023762A1 (en) * 2015-07-31 2017-02-09 Ecolab Usa Inc. Clean-place method and system and composition for the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204151420U (en) * 2014-08-25 2015-02-11 江阴济化新材料有限公司 The on-line cleaning device of crystallizer in flush acid system
CN205990248U (en) * 2016-08-29 2017-03-01 金川集团股份有限公司 A kind of salt water conveying system having from cleaning function
CN107569994A (en) * 2017-09-29 2018-01-12 禹州市维立特化工有限公司 A kind of alkali liquor absorption tower with filler back purge system

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Effective date of registration: 20220512

Address after: 737100 No.1 Lanzhou Road, Jinchuan District, Jinchang City, Gansu Province

Patentee after: Jinchuan Group Chemical New Materials Co.,Ltd.

Address before: 737103 No. 98, Jinchuan Road, Jinchang, Gansu

Patentee before: JINCHUAN GROUP Co.,Ltd.

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