CN114797407A - Two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system and method - Google Patents

Two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system and method Download PDF

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Publication number
CN114797407A
CN114797407A CN202210611938.1A CN202210611938A CN114797407A CN 114797407 A CN114797407 A CN 114797407A CN 202210611938 A CN202210611938 A CN 202210611938A CN 114797407 A CN114797407 A CN 114797407A
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China
Prior art keywords
slurry
tower
flash
gas
desulfurization
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Pending
Application number
CN202210611938.1A
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Chinese (zh)
Inventor
徐世明
彭烁
马连东
周贤
高泽洋
安航
尚忠宝
姚国鹏
黄永琪
白烨
蔡浩飞
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Huaneng Clean Energy Research Institute
Huaneng Yingkou Thermal Power Co Ltd
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Huaneng Clean Energy Research Institute
Huaneng Yingkou Thermal Power Co Ltd
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Priority to CN202210611938.1A priority Critical patent/CN114797407A/en
Publication of CN114797407A publication Critical patent/CN114797407A/en
Pending legal-status Critical Current

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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
    • B01D53/343—Heat recovery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0036—Flash degasification
    • 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
    • B01D3/007—Energy recuperation; Heat pumps
    • 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
    • B01D3/06—Flash distillation
    • 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
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur 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
    • B01D53/46—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
    • B01D53/73—After-treatment of removed components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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

Abstract

The invention discloses a two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system and a method, wherein the two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system comprises a gas-liquid separator, a flash evaporation tower and a spray tower; the inlet of the gas-liquid separator is connected with a desulfurization slurry outlet of the desulfurization tower, the liquid outlet of the gas-liquid separator is connected with a slurry distribution pipe bundle of the flash tower, the steam outlet of the flash tower is connected with the spray tower, and the spray tower is connected with a secondary vacuum pump. The content of the slurry gas entering the flash tower is reduced, thereby improving the flash efficiency.

Description

Two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system and method
Technical Field
The invention belongs to the field of desulfurization slurry flash evaporation, and relates to a two-stage vacuumizing desulfurization slurry flash evaporation heat-extraction system and method.
Background
The desulfurization slurry flash evaporation heat extraction technology is a novel flue gas waste heat recovery technology. The technology utilizes the characteristic that the boiling point of the slurry in the wet flue gas desulfurization process is reduced along with the reduction of the environmental pressure to establish a vacuum phase change environment, so that the desulfurization slurry above the current negative pressure saturation temperature is subjected to flash evaporation, negative pressure steam is generated and is conveyed to an absorption heat pump to carry out condensation and heat release on a low-temperature medium, and clean, efficient and low-cost recovery of the waste heat of the desulfurization slurry is realized. The technology can realize multiple purposes of saving energy and water, improving the desulfurization efficiency and eliminating visual pollution of smoke plume, and can simultaneously take energy conservation and emission reduction into consideration.
However, the desulfurization slurry contains carbon dioxide and sulfur dioxide, which affects the flash evaporation effect in the flash evaporation tower.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a two-stage vacuumizing desulfurization slurry flash evaporation heat-extraction system and method, which can reduce the content of slurry gas entering a flash tower and improve the flash evaporation efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system comprises a gas-liquid separator, a flash evaporation tower and a spray tower;
the inlet of the gas-liquid separator is connected with a desulfurization slurry outlet of the desulfurization tower, the liquid outlet of the gas-liquid separator is connected with a slurry distribution pipe bundle of the flash tower, the steam outlet of the flash tower is connected with the spray tower, and the spray tower is connected with a secondary vacuum pump.
Preferably, the gas outlet of the gas-liquid separator is connected with a primary vacuum pump.
Preferably, the slurry distribution pipe bundle extends into the flash tower, and a plurality of slurry nozzles are uniformly distributed on the part of the slurry distribution pipe bundle extending into the flash tower along the axial direction; the bottom of the flash tower is provided with a cold slurry outlet; the steam outlet of the flash tower is connected with the spray tower through a connecting pipe, the upper part of the spray tower is provided with a water distribution pipe bundle, the water distribution pipe bundle is connected with cooling water, the water distribution pipe bundle is provided with a plurality of cooling water nozzles, the secondary vacuum pump is positioned below the water distribution pipe bundle, and the bottom of the spray tower is provided with a cooling water outlet.
Furthermore, a partition plate is arranged at the inlet of the secondary vacuum pump of the spray tower.
Further, a demister is arranged in the flash tower and is positioned above the slurry distribution pipe bundle.
Furthermore, a slurry pump is arranged on the slurry distribution pipe bundle, and a cooling water inlet pump is arranged on the water distribution pipe bundle.
Further, the cold slurry outlet is connected to the desulfurizing tower, and the cooling water outlet is connected to the water distribution pipe bundle.
Furthermore, a cold slurry pump is arranged at the cold slurry outlet, and a cooling water outlet pump is arranged at the cooling water outlet.
A method for the two-stage vacuumizing desulfurization slurry flash evaporation heat-extraction system based on any one of the above processes comprises the following steps:
and (2) enabling the desulfurization slurry from the desulfurization tower to enter a gas-liquid separator, separating carbon dioxide and sulfur dioxide gas from the desulfurization slurry in the gas-liquid separator, enabling the desulfurization slurry with the separated gas to enter a flash tower through a slurry distribution pipe bundle for flash evaporation, and vacuumizing a secondary vacuum pump in a spray tower to provide a negative pressure environment for the flash tower.
Preferably, the primary vacuum pump vacuumizes the inside of the gas-liquid separator, and the vacuum degree in the gas-liquid separator is greater than the pressure of the water in the desulfurization slurry undergoing flash evaporation.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the gas-liquid separator is arranged in front of the desulfurization tower, and the desulfurized slurry passes through the gas-liquid separator before entering the flash tower to remove part of gases such as carbon dioxide and sulfur dioxide, so that the content of the slurry gas entering the flash tower is reduced, and the flash efficiency is improved.
Further, the gas-liquid separator is vacuumized by a primary vacuum pump, the vacuum degree is maintained above the pressure of flash evaporation of water in the desulfurization slurry, so that only gas is separated from the gas-liquid separator without flash evaporation, and flash evaporation is generated by secondary vacuum pumping in the flash evaporation tower.
Drawings
FIG. 1 is a schematic diagram of a flash vaporization heat extraction system according to the present invention.
Wherein: 1-a flash column; 2-a demister; 3-cooling water inlet pump; 4-laying a slurry tube bundle; 5-slurry nozzle; 6-slurry pump; 7-distributing water pipe bundles; 8-a secondary vacuum pump; 9-cooling water outlet pump; 10-a spray tower; 11-a separator; 12-a cold slurry pump; 13-a gas-liquid separator; 14-primary vacuum pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the two-stage vacuumized desulfurization slurry flash evaporation heat-extraction system of the present invention includes a flash tower 1, a demister 2, a cooling water inlet pump 3, a slurry distribution tube bundle 4, a slurry nozzle 5, a slurry pump 6, a water distribution tube bundle 7, a secondary vacuum pump 8, a cooling water outlet pump 9, a spray tower 10, a partition 11, a cold slurry pump 12, a gas-liquid separator 13, and a primary vacuum pump 14.
The inlet of the gas-liquid separator 13 is connected with a desulfurization slurry outlet of the desulfurization tower, the liquid outlet of the gas-liquid separator 13 is connected with a slurry distribution pipe bundle 4 of the flash tower 1, the steam outlet of the flash tower 1 is connected with the spray tower 10, and the spray tower 10 is connected with the secondary vacuum pump 8.
A primary vacuum pump 14 is connected to a gas outlet of the gas-liquid separator 13. The primary vacuum pump 14 evacuates the inside of the gas-liquid separator 13, and the vacuum degree in the gas-liquid separator 13 is higher than the pressure at which the water in the desulfurized slurry is flashed.
The slurry distribution pipe bundle 4 extends into the flash tower 1, and a plurality of slurry nozzles 5 are uniformly distributed on the part of the slurry distribution pipe bundle 4 extending into the flash tower 1 along the axial direction; the bottom of the flash tower 1 is provided with a cold slurry outlet; the steam outlet of the flash tower 1 is connected with a spray tower 10 by a connecting pipe, the upper part of the spray tower 10 is provided with a water distribution pipe bundle 7, the water distribution pipe bundle 7 is connected with cooling water, the water distribution pipe bundle 7 is provided with a plurality of cooling water nozzles 10, a secondary vacuum pump 8 is positioned below the water distribution pipe bundle 7, and the bottom of the spray tower 10 is provided with a cooling water outlet.
The slurry distributing pipe bundle 4 is provided with a slurry pump 6, and the water distributing pipe bundle 7 is provided with a cooling water inlet pump 3. The spray tower 10 is provided with a partition 11 at the inlet of the secondary vacuum pump 8. Be provided with defroster 2 in the flash column 1, defroster 2 is located cloth thick liquid tube bank 4 tops. The slurry distributing pipe bundle 4 is provided with a slurry pump 6, and the water distributing pipe bundle 7 is provided with a cooling water inlet pump 3.
The cold slurry outlet is connected to the desulfurizing tower, the cooling water outlet is connected to the water distribution pipe bundle 7, the cold slurry pump 12 is arranged at the cold slurry outlet, and the cooling water outlet is provided with the cooling water outlet pump 9.
The flash tower 1 is of a circular structure, and a cavity is in a negative pressure environment; the inlet of the gas-liquid separator 13 is connected with the desulfurized slurry outlet of the wet desulfurization tower of the coal-fired unit, and the liquid outlet of the gas-liquid separator 13 is connected with the slurry inlet of the slurry distribution pipe bundle 4 of the flash tower 1; a plurality of slurry nozzles 5 are uniformly distributed on the slurry distribution pipe bundle 4 along the axial direction; and a cold slurry outlet is formed at the bottom of the flash tower 1.
A connecting pipe is arranged on an upper opening of the flash tower 1 and extends into the spray tower 10, and a cooling water outlet is arranged at the bottom of the spray tower 10. The desulfurization slurry from the desulfurizing tower enters a gas-liquid separator 13, is vacuumized by a primary vacuum pump 14, and simultaneously takes out gases such as carbon dioxide and sulfur dioxide, then enters a slurry distribution tube bundle 4, is sprayed and crushed into small droplets through a slurry nozzle 5 after being boosted by a slurry pump 6, because a flash tower 1 is in a negative pressure environment, the slurry droplets are subjected to flash evaporation, and the steam which is flashed out enters a connecting pipe after being demisted by a demister 2 and then enters a spray tower. The cooled cold slurry is collected at the bottom of the flash tower, and then is pressurized by the cold slurry pump 12 and then returns to the desulfurizing tower.
The water distribution pipe bundle 7 is arranged at the upper part of the spray tower, cooling water enters the water distribution pipe bundle 7, is sprayed and crushed into small liquid drops through the cooling water nozzle 10 after being boosted by the cooling water inlet pump 3, and the water vapor flashed off is cooled and condensed and is mixed with the small liquid drops, collected at the lower part of the spray tower, and then is boosted by the cooling water outlet pump 9 and returned. The secondary vacuum pump 8 is used for vacuumizing the flash tower 1, and a partition plate 11 is arranged at the inlet of the secondary vacuum pump 8 to prevent liquid drops from entering the secondary vacuum pump 8.
The primary vacuum pump 14 evacuates the inside of the gas-liquid separator 13, and the vacuum degree in the gas-liquid separator 13 is higher than the pressure at which the water in the desulfurized slurry is flashed.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the applicant consider that such subject matter is not considered part of the disclosed subject matter.

Claims (10)

1. A two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system is characterized by comprising a gas-liquid separator (13), a flash evaporation tower (1) and a spray tower (10);
the inlet of the gas-liquid separator (13) is connected with a desulfurization slurry outlet of the desulfurization tower, the liquid outlet of the gas-liquid separator (13) is connected with a slurry distribution pipe bundle (4) of the flash tower (1), the steam outlet of the flash tower (1) is connected with the spray tower (10), and the spray tower (10) is connected with the secondary vacuum pump (8).
2. A two-stage vacuum desulfurization slurry flash evaporation heat extraction system according to claim 1, characterized in that a gas outlet of the gas-liquid separator (13) is connected with a primary vacuum pump (14).
3. A two-stage vacuumizing desulfurization slurry flash evaporation heat-extraction system according to claim 1, characterized in that a slurry distribution pipe bundle (4) extends into the flash tower (1), and a plurality of slurry nozzles (5) are uniformly distributed on the part of the slurry distribution pipe bundle (4) extending into the flash tower (1) along the axial direction; the bottom of the flash tower (1) is provided with a cold slurry outlet; the steam outlet of the flash tower (1) is connected with the spray tower (10) through a connecting pipe, the upper part of the spray tower (10) is provided with a water distribution pipe bundle (7), the water distribution pipe bundle (7) is connected with cooling water, a plurality of cooling water nozzles (10) are arranged on the water distribution pipe bundle (7), the secondary vacuum pump (8) is positioned below the water distribution pipe bundle (7), and the bottom of the spray tower (10) is provided with a cooling water outlet.
4. A two-stage vacuum pumping desulfurization slurry flash heat-extraction system according to claim 3, characterized in that the spray tower (10) is provided with a partition plate (11) at the inlet of the secondary vacuum pump (8).
5. A two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system according to claim 3, characterized in that a demister (2) is arranged in the flash tower (1), and the demister (2) is positioned above the slurry distribution pipe bundle (4).
6. A two-stage vacuum-pumping desulfurization slurry flash evaporation heat-extraction system according to claim 3, characterized in that a slurry pump (6) is arranged on the slurry distribution pipe bundle (4), and a cooling water inlet pump (3) is arranged on the water distribution pipe bundle (7).
7. A two-stage evacuated desulfurization slurry flash heat removal system according to claim 3, characterized in that the cold slurry outlet is connected to the desulfurization tower and the cooling water outlet is connected to the water distribution tube bundle (7).
8. A two-stage vacuum desulfurization slurry flash evaporation heat extraction system according to claim 3, characterized in that a cold slurry pump (12) is provided at the cold slurry outlet, and a cooling water outlet pump (9) is provided at the cooling water outlet.
9. The method for the two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system based on any one of claims 1-8 is characterized by comprising the following processes:
and the desulfurized slurry from the desulfurization tower enters a gas-liquid separator (13), carbon dioxide and sulfur dioxide gas are separated from the desulfurized slurry in the gas-liquid separator (13), then the desulfurized slurry with the separated gas enters a flash tower (1) through a slurry distribution pipe bundle (4) for flash evaporation, and a secondary vacuum pump (8) in a spray tower (10) is vacuumized to provide a negative pressure environment in the flash tower (1).
10. The two-stage vacuumizing desulfurization slurry flash evaporation heat-extraction method according to claim 9, characterized in that the primary vacuum pump (14) vacuumizes the inside of the gas-liquid separator (13), and the vacuum degree in the gas-liquid separator (13) is greater than the pressure of the desulfurization slurry in which water is flashed.
CN202210611938.1A 2022-05-31 2022-05-31 Two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system and method Pending CN114797407A (en)

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CN202210611938.1A CN114797407A (en) 2022-05-31 2022-05-31 Two-stage vacuumizing desulfurization slurry flash evaporation heat extraction system and method

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009102959A1 (en) * 2008-02-15 2009-08-20 Coalstar Industries, Inc. Apparatus and processes for production of coke and activated carbon from coal products
CN109780745A (en) * 2018-12-03 2019-05-21 珠海格力电器股份有限公司 Air-conditioning
CN114014402A (en) * 2021-11-30 2022-02-08 华能营口热电有限责任公司 Vertical-layout desulfurization slurry flash evaporation heat extraction system and working method thereof
CN217410304U (en) * 2022-05-31 2022-09-13 华能营口热电有限责任公司 Desulfurization slurry flash evaporation heat extraction system with two-stage vacuumizing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009102959A1 (en) * 2008-02-15 2009-08-20 Coalstar Industries, Inc. Apparatus and processes for production of coke and activated carbon from coal products
CN109780745A (en) * 2018-12-03 2019-05-21 珠海格力电器股份有限公司 Air-conditioning
CN114014402A (en) * 2021-11-30 2022-02-08 华能营口热电有限责任公司 Vertical-layout desulfurization slurry flash evaporation heat extraction system and working method thereof
CN217410304U (en) * 2022-05-31 2022-09-13 华能营口热电有限责任公司 Desulfurization slurry flash evaporation heat extraction system with two-stage vacuumizing

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