CN114234708A - Cleaning method of heat exchanger in wastewater treatment process by reduced pressure distillation - Google Patents
Cleaning method of heat exchanger in wastewater treatment process by reduced pressure distillation Download PDFInfo
- Publication number
- CN114234708A CN114234708A CN202111419456.8A CN202111419456A CN114234708A CN 114234708 A CN114234708 A CN 114234708A CN 202111419456 A CN202111419456 A CN 202111419456A CN 114234708 A CN114234708 A CN 114234708A
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- Prior art keywords
- heat exchanger
- plate heat
- reduced pressure
- sodium hydroxide
- liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
- B01D5/0015—Plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/0096—Cleaning
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/141—Wind power
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
A cleaning method of a heat exchanger in the process of treating wastewater by reduced pressure distillation comprises the following steps: a gas-phase inlet end of the plate heat exchanger is connected with a washing liquid branch pipe, and a liquid-phase outlet end of the plate heat exchanger is provided with a transparent window; when the negative pressure of the reduced pressure distillation tower is increased, introducing a sodium hydroxide solution with the temperature of 60-70 ℃ and the concentration of 32% into the plate heat exchanger through the washing liquid branch pipe; observing through a transparent window, and stopping introducing the sodium hydroxide solution when the liquid at the liquid phase outlet end changes from clear to turbid and then changes into clear again; and observing the negative pressure value of the reduced pressure distillation tower, and indicating that the blockage phenomenon in the plate heat exchanger is removed after the negative pressure value is restored to a normal value. The method can clean the blocked plate heat exchanger on line without disassembling the plate heat exchanger, and hardly influences the production.
Description
Technical Field
The invention relates to a cleaning method of a heat exchanger in a wastewater treatment process by reduced pressure distillation.
Background
High salt (ammonium chloride salt) high COD waste water that produces in sucralose production gets into biochemical system and carries out advanced treatment after evaporating the preliminary treatment, finally discharges up to standard, and the mother liquor volume that produces in this process is more, disposes with danger useless usually, and the processing degree of difficulty is big.
The existing solution is to carry out salt discharge by multi-stage evaporation concentration technology so as to achieve the purposes of discharging salt to the maximum extent, reducing the yield of mother liquor and reducing the treatment cost. The method comprises the steps of concentrating the wastewater through reduced pressure distillation, separating out salt in the wastewater after cooling because of solubility change, performing centrifugal operation to remove the salt in the wastewater, concentrating the mother liquor for many times to obtain salt, and separating out the salt in the mother liquor to the maximum extent, so that the yield of the mother liquor is reduced; so as to achieve the purpose of reducing the generation amount of the mother liquor.
Because the wastewater in the actual production process contains more impurities (not only salt and COD), part of substances can react at high temperature during reduced pressure distillation to generate small solid granular substances (mainly some sulfides after detection), the solid granular substances can enter the plate heat exchanger of the condensation section along with the water vapor, and when the solid substances are concentrated for one time, more water is generated, the solid substances enter the plate heat exchanger of the condensation section along with the water vapor, but the plate heat exchanger cannot be blocked under the flushing of distilled water, the boiling point of the mother liquor after the salt is concentrated for one time is increased, less water is generated in the subsequent evaporation process, more solid substances can be blocked in the plate heat exchanger of the condensation section of the subsequent evaporator, the production is influenced, if the blockage in the plate heat exchanger needs to be detached and cleaned, time and labor are wasted, but also affects production.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for cleaning a heat exchanger in the process of treating wastewater by reduced pressure distillation, which can clean a blocked plate heat exchanger on line without disassembling the plate heat exchanger and hardly affect production.
In order to solve the technical problem, the invention provides a method for cleaning a heat exchanger in a wastewater treatment process by reduced pressure distillation, which comprises the following steps:
(1) a gas-phase inlet end of the plate heat exchanger is connected with a washing liquid branch pipe, and a liquid-phase outlet end of the plate heat exchanger is provided with a transparent window;
(2) when the negative pressure of the reduced pressure distillation tower rises, judging that the plate heat exchanger is blocked;
(3) introducing a sodium hydroxide solution with the temperature of 60-70 ℃ and the concentration of 32% into the plate heat exchanger through a washing liquid branch pipe;
(4) observing through a transparent window, wherein when the sodium hydroxide solution is just introduced, the liquid at the liquid phase outlet end turns turbid from clear, and when the liquid at the liquid phase outlet end turns clear again, the introduction of the sodium hydroxide solution is stopped;
(5) and observing the negative pressure value of the reduced pressure distillation tower, and indicating that the blockage phenomenon in the plate heat exchanger is removed after the negative pressure value is restored to a normal value.
Preferably, the sodium hydroxide solution is prepared by mixing sodium hydroxide powder and evaporation condensate of an evaporation section.
The invention has the advantages that: because it is some sulfides to detect to block up plate heat exchanger, so adopt hot sodium hydroxide solution to carry out high-efficient washing, the cleaning performance is good, change through vacuum distillation tower negative pressure value and judge the jam condition, observe the liquid phase state of plate heat exchanger liquid phase exit end through the window and judge the beginning and the end of cleaning reaction, the negative pressure value through vacuum distillation tower resumes the condition at last and judges the cleaning performance, the structure of current evaporation condensing equipment can furthest be remain to this kind of mode, the cost is lower in the realization, because the cleaning process can go on-line, need not to disassemble plate heat exchanger, very big improvement efficiency, and the cleaning performance is good.
Many evaporation sections are arranged in sucralose production, steam condensate generated in the evaporation sections is high-temperature liquid, and the high-temperature liquid is used as a solvent to dissolve sodium hydroxide powder, so that a sodium hydroxide solution with the temperature meeting the requirement can be directly obtained, hot water does not need to be prepared separately, and the sucralose production process is energy-saving and environment-friendly.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
Referring to fig. 1, a cleaning method of a heat exchanger in a process of treating wastewater by vacuum distillation comprises the following steps:
(1) a gas-phase inlet end of the plate heat exchanger is connected with a washing liquid branch pipe, and a liquid-phase outlet end of the plate heat exchanger is provided with a transparent window;
(2) when the negative pressure of the reduced pressure distillation tower rises, judging that the plate heat exchanger is blocked;
(3) introducing a sodium hydroxide solution with the temperature of 60-70 ℃ and the concentration of 32% into the plate heat exchanger through a washing liquid branch pipe;
(4) observing through a transparent window, wherein when the sodium hydroxide solution is just introduced, the liquid at the liquid phase outlet end turns turbid from clear, and when the liquid at the liquid phase outlet end turns clear again, the introduction of the sodium hydroxide solution is stopped;
(5) and observing the negative pressure value of the reduced pressure distillation tower, and indicating that the blockage phenomenon in the plate heat exchanger is removed after the negative pressure value is restored to a normal value.
The sodium hydroxide solution is formed by mixing sodium hydroxide powder and evaporation condensate in an evaporation section.
The invention has the advantages that: because it is some sulfides to detect to block up plate heat exchanger, so adopt hot sodium hydroxide solution to carry out high-efficient washing, the cleaning performance is good, change through vacuum distillation tower negative pressure value and judge the jam condition, observe the liquid phase state of plate heat exchanger liquid phase exit end through the window and judge the beginning and the end of cleaning reaction, the negative pressure value through vacuum distillation tower resumes the condition at last and judges the cleaning performance, the structure of current evaporation condensing equipment can furthest be remain to this kind of mode, the cost is lower in the realization, because the cleaning process can go on-line, need not to disassemble plate heat exchanger, very big improvement efficiency, and the cleaning performance is good.
Many evaporation sections are arranged in sucralose production, steam condensate generated in the evaporation sections is high-temperature liquid, and the high-temperature liquid is used as a solvent to dissolve sodium hydroxide powder, so that a sodium hydroxide solution with the temperature meeting the requirement can be directly obtained, hot water does not need to be prepared separately, and the sucralose production process is energy-saving and environment-friendly.
Claims (2)
1. A cleaning method of a heat exchanger in the process of treating wastewater by reduced pressure distillation is characterized by comprising the following steps:
(1) a gas-phase inlet end of the plate heat exchanger is connected with a washing liquid branch pipe, and a liquid-phase outlet end of the plate heat exchanger is provided with a transparent window;
(2) when the negative pressure of the reduced pressure distillation tower rises, judging that the plate heat exchanger is blocked;
(3) introducing a sodium hydroxide solution with the temperature of 60-70 ℃ and the concentration of 32% into the plate heat exchanger through a washing liquid branch pipe;
(4) observing through a transparent window, wherein when the sodium hydroxide solution is just introduced, the liquid at the liquid phase outlet end turns turbid from clear, and when the liquid at the liquid phase outlet end turns clear again, the introduction of the sodium hydroxide solution is stopped;
(5) and observing the negative pressure value of the reduced pressure distillation tower, and indicating that the blockage phenomenon in the plate heat exchanger is removed after the negative pressure value is restored to a normal value.
2. The method for cleaning the heat exchanger in the wastewater treatment process by reduced pressure distillation according to claim 1, wherein the method comprises the following steps: the sodium hydroxide solution is formed by mixing sodium hydroxide powder and evaporation condensate in an evaporation section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111419456.8A CN114234708A (en) | 2021-11-26 | 2021-11-26 | Cleaning method of heat exchanger in wastewater treatment process by reduced pressure distillation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111419456.8A CN114234708A (en) | 2021-11-26 | 2021-11-26 | Cleaning method of heat exchanger in wastewater treatment process by reduced pressure distillation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114234708A true CN114234708A (en) | 2022-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111419456.8A Pending CN114234708A (en) | 2021-11-26 | 2021-11-26 | Cleaning method of heat exchanger in wastewater treatment process by reduced pressure distillation |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203501864U (en) * | 2013-09-27 | 2014-03-26 | 武汉钢铁(集团)公司 | On-line cleaning type heat exchanger |
| CN104848734A (en) * | 2014-11-19 | 2015-08-19 | 青岛同创节能环保工程有限公司 | Descaling and rinsing method for plate heat exchange unit |
| CN208736240U (en) * | 2018-06-14 | 2019-04-12 | 上海丰律流体技术有限公司 | A kind of system judging plate heat exchanger blocking certainly |
| CN110160392A (en) * | 2019-05-29 | 2019-08-23 | 佛山市海天（江苏）调味食品有限公司 | A kind of on-line cleaning method of plate heat exchanger |
| CN110657703A (en) * | 2019-11-04 | 2020-01-07 | 江苏亨通精工金属材料有限公司 | Plate radiator online cleaning device |
| CN210625462U (en) * | 2019-07-17 | 2020-05-26 | 中国铁建重工集团股份有限公司 | Shield constructs machine and plate heat exchanger scale removal cleaning system thereof |
| CN214120924U (en) * | 2020-12-28 | 2021-09-03 | 阳新鹏富矿业有限公司 | Cleaning device for plate-fin heat exchanger |
-
2021
- 2021-11-26 CN CN202111419456.8A patent/CN114234708A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203501864U (en) * | 2013-09-27 | 2014-03-26 | 武汉钢铁(集团)公司 | On-line cleaning type heat exchanger |
| CN104848734A (en) * | 2014-11-19 | 2015-08-19 | 青岛同创节能环保工程有限公司 | Descaling and rinsing method for plate heat exchange unit |
| CN208736240U (en) * | 2018-06-14 | 2019-04-12 | 上海丰律流体技术有限公司 | A kind of system judging plate heat exchanger blocking certainly |
| CN110160392A (en) * | 2019-05-29 | 2019-08-23 | 佛山市海天（江苏）调味食品有限公司 | A kind of on-line cleaning method of plate heat exchanger |
| CN210625462U (en) * | 2019-07-17 | 2020-05-26 | 中国铁建重工集团股份有限公司 | Shield constructs machine and plate heat exchanger scale removal cleaning system thereof |
| CN110657703A (en) * | 2019-11-04 | 2020-01-07 | 江苏亨通精工金属材料有限公司 | Plate radiator online cleaning device |
| CN214120924U (en) * | 2020-12-28 | 2021-09-03 | 阳新鹏富矿业有限公司 | Cleaning device for plate-fin heat exchanger |
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