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CN109999622B - Wet curtain solution dehydrator and dehydration method thereof - Google Patents

Wet curtain solution dehydrator and dehydration method thereof Download PDF

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Publication number
CN109999622B
CN109999622B CN201910134889.5A CN201910134889A CN109999622B CN 109999622 B CN109999622 B CN 109999622B CN 201910134889 A CN201910134889 A CN 201910134889A CN 109999622 B CN109999622 B CN 109999622B
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water
dehydrator
wet curtain
gas
solution
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CN109999622A (en
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张晓国
张汇川
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Wuxi Shanning Machinery Co ltd
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Wuxi Shanning Machinery Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/26Drying gases or vapours
    • B01D53/263Drying gases or vapours by absorption
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/80Water

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention belongs to the technical field of dehydration and drying treatment of water-containing flue gas, and discloses a wet curtain solution dehydrator, which comprises the following components: the device comprises a support column, a lower water tank, a blow-down valve, a gas inlet, a wall plate, a lower pattern plate, a wet gas channel, a wet curtain component, a dry gas channel, an upper pattern plate, a gas outlet, an upper gas header, a concentrated solution supply system, a dilute solution drainage system, a water spraying system and an overflow pipe. The upper half part of the box body in the dehydrator is composed of a lower pattern plate, a wet curtain component, an upper pattern plate and surrounding wall plates, wherein N wet gas channels and N-1 dry gas channels are formed; a water spraying system is arranged at the lower half part of the box body in the dehydrator. The integrated structure of water spray precooling and wet curtain solution dehydration is adopted, and the wet curtain component is utilized to enable the salt solution to be fully contacted with the water-containing flue gas, so that the dehydration efficiency is high, the structure is compact, the occupied area is small, the application range is wide, and the equipment investment is saved.

Description

Wet curtain solution dehydrator and dehydration method thereof
Technical Field
The invention belongs to the technical field of dehydration and drying treatment of water-containing flue gas, and particularly relates to a wet curtain solution dehydrator and a dehydration method thereof.
Background
A large amount of water-containing flue gas can be generated in the industrial production process, the water-containing flue gas without dust is generally discharged in an unstructured mode or discharged in a high altitude mode, the water-containing flue gas with dust is generally discharged in a high altitude mode after being purified, the water-containing flue gas contains more water vapor and has a certain temperature, the color of the flue gas is generally white, the white flue gas is condensed into raindrops with a certain corrosiveness after being contacted with air cooling air in the process of being discharged into the atmosphere, the raindrops fall to the periphery to form white pollution, and meanwhile, a large amount of water vapor is discharged into the atmosphere, so that the waste of water resources is also caused. Along with the continuous improvement of the national requirements of energy conservation, emission reduction and environmental protection, the requirements of dehydration and drying of the water-containing flue gas are that the white flue gas is treated by the process of whitening, so that the pollution to the environment is reduced; at present, the types of treatment equipment for dehydrating and drying the water-containing flue gas are few, and the type of the treatment equipment is mainly three types, namely simpler and more conventional dehydration equipment, mainly including a water blocking grid, a demister, a centrifugal dehydrator and the like, and the dehydration equipment has low dehydration efficiency and cannot meet the current environmental protection requirement of 'whitening' treatment of the water-containing flue gas; secondly, the whitening and dewatering equipment of the water scrubber comprises the processes of cooling, demisting, mixing wind, diluting, cooling, dewatering and the like of the water-containing flue gas, and has the defects of good dewatering effect, complex equipment, large investment and the like; thirdly, the heating white-eliminating dehydration equipment heats the water vapor in the flue gas into the superheated vapor to achieve the white-eliminating effect, the heating equipment consumes energy, the water vapor can not be recovered, and the water resource waste is caused.
In summary, the problems of the prior art are: if the treatment equipment with better dehydration effect is selected, the defects of complex equipment, large investment or energy consumption, water resource waste and the like exist; if the conventional simple dehydration and drying equipment is adopted, the dehydration efficiency is low, and the environment protection requirement cannot be met.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a wet curtain solution dehydrator and a dehydration method thereof; the wet curtain member is used for fully contacting the salt solution with the water-containing flue gas, has the advantages of high dehydration efficiency, compact structure, small occupied area, wide application range, equipment investment saving and the like, can be used for dehydration and drying treatment of high-temperature water-containing flue gas and dehydration and drying treatment equipment for the water-containing flue gas at the front end of a dry dust remover, achieves the effect of 'whitening' the water-containing flue gas, solves the dehydration and drying problem of the water-containing flue gas, and reduces the pollution of the water-containing flue gas to the environment.
The invention discloses a wet curtain solution dehydrator, which comprises: the device comprises a support column, a lower water tank, a blow-down valve, a gas inlet, a wall plate, a lower pattern plate, a wet gas channel, a wet curtain component, a dry gas channel, an upper pattern plate, a gas outlet, an upper gas header, a concentrated solution supply system, a dilute solution drainage system, a water spraying system and an overflow pipe;
The upper gas header is positioned at the top of the dehydrator and is reversely buckled on the upper flower plate and communicated with the dry gas channel; the gas outlet is positioned at the left side or the right side of the upper gas header; the lower pattern plate, the upper pattern plate and the surrounding wall plates are connected by welding or bolts; the wet curtain component is vertically arranged between the lower pattern plate and the upper pattern plate; the concentrated solution supply system is positioned at the top of the wet curtain assembly and below the upper pattern plate; the dilute solution drainage system is positioned at the bottom of the wet curtain assembly and above the lower pattern plate; the water spraying system is positioned below the lower flower plate, and the lower water tank is positioned at the bottom of the dehydrator; the overflow pipe is positioned at the overflow water level of the lower water tank, and the drain valve is positioned at the lowest position of the lower water tank; the gas inlet is positioned at the left side or the right side of the lower part of the dehydrator wall plate and is positioned above the overflow water level line of the lower water tank; the support post is welded or bolted with the wall plate and the lower water tank.
Furthermore, the dehydrator adopts an integrated structure of water spray precooling and wet curtain solution dehydration.
Further, the upper half part of the box body in the dehydrator is composed of a lower pattern plate, a wet curtain component, an upper pattern plate and surrounding wall plates to form N moisture channels and N-1 dry gas channels.
Further, the water spraying system of the dehydrator is positioned at the lower half part of the box body in the dehydrator.
The wet curtain solution dehydration method comprises the following steps:
1) Determining the main components, the water content, the temperature, the moisture content and the basic parameters of the treated air quantity of the water-containing flue gas at the inlet of the dehydrator, determining the parameters of the water content, the temperature and the moisture content of the flue gas at the outlet of the dehydrator according to the environmental protection requirement, and calculating the total dehydration efficiency of the dehydrator; the inlet moisture content of the dehydrator is d 1, the moisture content of the smoke emission required by environmental protection is d 2, and the total dehydration efficiency of the dehydrator is as follows: η Total (S) =(1-d2/d1) x100%;
2) After entering from the inlet at the lower part of the dehydrator, the water-containing flue gas is cooled, condensed and dehumidified by a water spraying system; the sprayed water flows out from an overflow pipe on the lower water tank, and the sewage is discharged from a blow-down valve at the bottom of the lower water tank at regular intervals;
according to parameters of the temperature and the moisture content of the flue gas after water spraying, parameters of the graded dehydration efficiency of the dehydrator, the water spraying amount, the water spraying discharge number and the water spraying pressure of a spraying system are calculated; the moisture content of the flue gas after water spraying is d 3, and the fractional dehydration efficiency eta 1=(1-d3/d1) is x100%;
3) The water-containing flue gas sprayed by water enters a dry gas channel from a wet gas channel at the upper half part of the middle box body through a wet curtain component, salt solution flows out from the top of the wet curtain component through a concentrated solution liquid supply system, flows down vertically along the wet curtain, absorbs water vapor in the water-containing flue gas and becomes dilute solution, and the dilute solution flows out from a dilute solution liquid discharge system arranged at the bottom of the wet curtain component; at this time, the fractional dehydration efficiency eta 2=(1-d2/d3) is x100 percent, and the released heat after the water-containing flue gas is dehydrated and dried is equal to the absorbed heat after the concentrated solution absorbs the water vapor; the parameters of the wet gas channel, the dry gas channel, the wet curtain component area, the concentrated solution liquid supply system and the dilute solution liquid discharge system are calculated according to the parameters of the air flow speed, the graded dehydration efficiency, the solution temperature, the concentration change and the heat exchange heat balance, and the moisture content of the dehydrated and dried flue gas can be adjusted according to the changes of the solution temperature, the concentration and the solution circulation quantity so as to adapt to the requirements of different environments;
4) The flue gas which is subjected to moisture absorption and dehydration through the wet curtain component and meets the environmental protection emission requirement is collected into the upper gas header of the dehydrator through the dry gas channel and is discharged from the gas outlet;
5) And finally, determining the external dimension of the wet curtain solution dehydrator and the medium parameters of the required external interface.
Compared with the prior art, the invention has the beneficial effects that: 1) The salt solution is used for absorbing the water vapor in the aqueous flue gas to achieve the dehydration and drying effects on the aqueous flue gas, and the wet curtain component is used for enabling the salt solution to be fully contacted with the aqueous flue gas, so that the dehydration efficiency is high; 2) The moisture content of the dehydrated and dried flue gas is regulated according to the changes of the temperature, the concentration and the circulation amount of the solution, so that the application range is wide, and the requirements of different environments are met; 3) The integrated structure of water spray precooling and wet curtain solution dehydration is adopted, so that the structure is compact, the occupied area is small, and the equipment investment is saved.
The invention has the advantages that: the integrated structure of water spray precooling and wet curtain solution dehydration is adopted, and the wet curtain component is utilized to enable the salt solution to be fully contacted with the water-containing flue gas, so that the dehydration efficiency is high, the structure is compact, the occupied area is small, the application range is wide, and the equipment investment is saved; the device can be used for the 'whitening' treatment of high-temperature water-containing flue gas and the dehydration and drying treatment equipment of the front end of a dry dust remover for the water-containing flue gas, solves the dehydration and drying problems of the water-containing flue gas, and reduces the pollution of the water-containing flue gas to the environment.
Drawings
Fig. 1 is a schematic diagram of the present invention. Among them, the pillar 1, the lower water tank 2, the drain valve 3, the gas inlet 4, the wall plate 5, the lower pattern plate 6, the wet gas channel 7, the wet curtain component 8, the dry gas channel 9, the upper pattern plate 10, the gas outlet 11, the upper gas header 12, the concentrated solution liquid supply system 13, the dilute solution liquid discharge system 14, the water spray system 15 and the overflow pipe 16.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The structure of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a wet curtain solution dehydrator of the present invention includes: the device comprises a support column 1, a lower water tank 2, a blow-down valve 3, a gas inlet 4, a wall plate 5, a lower flower plate 6, a wet gas channel 7, a wet curtain component 8, a dry gas channel 9, an upper flower plate 10, a gas outlet 11, an upper gas header 12, a concentrated solution liquid supply system 13, a dilute solution liquid discharge system 14, a water spray system 15 and an overflow pipe 16.
The dehydrator adopts an integrated structure of water spray precooling and wet curtain solution dehydration.
The upper half part of the box body of the dehydrator is formed by a lower pattern plate 6, a wet curtain component 7, an upper pattern plate 10 and surrounding wall plates 5 to form N wet gas channels 7 and N-1 dry gas channels 9.
The dehydrator is positioned in the lower half of the housing in the dehydrator water spray system 15.
The upper gas header 12 is positioned at the uppermost surface of the dehydrator, is reversely buckled on the upper surface of the upper flower plate 10 and is communicated with the dry gas channel 9; the gas outlet 11 is located on the left or right side of the upper gas header 12; the lower pattern plate 6, the upper pattern plate 10 and the peripheral wall plates 5 are connected by adopting welding or bolts, and the wet curtain component 8 is vertically arranged between the lower pattern plate 6 and the upper pattern plate 10; the concentrated solution supply system 13 is positioned at the top of the wet curtain assembly 8 and below the upper pattern plate 10; the dilute solution drainage system 14 is positioned at the bottom of the wet curtain assembly 8 and above the lower pattern plate 6; the water spraying system 15 is positioned below the lower flower plate 6, the lower water tank 2 is positioned at the lowest part of the dehydrator, the overflow pipe 16 is positioned at the overflow water level of the lower water tank 2, and the lowest part of the lower water tank 2 of the blow-down valve 3; the gas inlet 4 is positioned on the left side or the right side of the lower part of the dehydrator wall plate 5 and is positioned above the overflow water level line of the lower water tank 2; the support column 1 is welded or bolted with the wall plate 5 and the lower water tank 2.
The invention is further described below in connection with the principles and steps of operation.
1) Determining basic parameters such as main components, water content, temperature, moisture content, treatment air quantity and the like of the water-containing flue gas at the inlet of the dehydrator, determining parameters such as the water content, the temperature, the moisture content and the like of the flue gas at the outlet of the dehydrator according to environmental protection requirements, and calculating the total dehydration efficiency of the dehydrator; the inlet moisture content of the dehydrator is d 1, the moisture content of the smoke emission required by environmental protection is d 2, and the total dehydration efficiency of the dehydrator is as follows: η Total (S) =(1-d2/d1) x100%.
2) The water-containing flue gas enters the lower half space of the dehydrator from the lower gas inlet 4 of the dehydrator, and is cooled, condensed and dehumidified by the water spraying system 15; at the moment, part of water vapor in the water-containing flue gas is condensed into water under the action of water spray cooling, the temperature of the flue gas is reduced, the moisture content is reduced, the effect of preliminary dehydration is achieved, and part of dust in the water-containing flue gas can be removed; the sprayed water flows out from an overflow pipe 16 on the lower water tank 2, and the sewage is periodically discharged from a blow-down valve 3 at the bottom of the lower water tank 2; according to parameters such as flue gas temperature, moisture content and the like after water spraying, parameters such as the stage dehydration efficiency of the dehydrator, the water spraying amount, the water spraying discharge number, the water spraying pressure and the like of a spraying system are calculated; the moisture content of the flue gas after water spraying is d 3, and the fractional dehydration efficiency eta 1=(1-d3/d1) is x100%.
3) The water-containing flue gas sprayed by water enters a dry gas channel 9 from a wet gas channel 7 at the upper half part of the middle box body through a wet curtain component 8, salt solution flows out from the top of the wet curtain component 8 through a concentrated solution supply system 13, flows down vertically along the wet curtain, turns into a dilute solution after absorbing water vapor in the water-containing flue gas, and flows out from a dilute solution drainage system 14 arranged at the bottom of the wet curtain component 8; at this time, the fractional dehydration efficiency eta 2=(1-d2/d3) is x100 percent, and the released heat after the water-containing flue gas is dehydrated and dried is equal to the absorbed heat after the concentrated solution absorbs the water vapor; and then, calculating parameters such as a wet gas channel, a dry gas channel, a wet curtain component area, a concentrated solution liquid supply system, a dilute solution liquid discharge system and the like according to parameters such as air flow speed, graded dehydration efficiency, solution temperature, concentration change, heat exchange heat balance and the like, and adjusting the moisture content of dehydrated and dried flue gas according to the changes of solution temperature, concentration and solution circulation quantity so as to adapt to the requirements of different environments.
4) The flue gas which is dehydrated and absorbed by the wet curtain component 8 and meets the environmental protection emission requirement is converged into the upper gas header 12 of the dehydrator through the dry gas channel 9 and is discharged from the gas outlet 11.
5) And finally, determining the external dimension of the wet curtain solution dehydrator and the medium parameters of the required external interface.
The wet curtain solution dehydrator adopts an integrated structure of water spray precooling and wet curtain solution dehydration, and utilizes the wet curtain component to fully contact the salt solution with the water-containing flue gas, so that the wet curtain solution dehydrator has the advantages of high dehydration efficiency, compact structure, small occupied area, wide application range and equipment investment saving; the device can be used for the 'whitening' treatment of high-temperature water-containing flue gas and the dehydration and drying treatment equipment of the front end of a dry dust remover for the water-containing flue gas, solves the dehydration and drying problems of the water-containing flue gas, and reduces the pollution of the water-containing flue gas to the environment.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (2)

1. A wet curtain solution dehydrator, comprising: the device comprises a support column, a lower water tank, a blow-down valve, a gas inlet, a wall plate, a lower pattern plate, a wet gas channel, a wet curtain component, a dry gas channel, an upper pattern plate, a gas outlet, an upper gas header, a concentrated solution supply system, a dilute solution drainage system, a water spraying system and an overflow pipe; the upper gas header is positioned at the top of the dehydrator and is reversely buckled on the upper flower plate and communicated with the dry gas channel; the gas outlet is positioned at the left side or the right side of the upper gas header; the lower pattern plate, the upper pattern plate and the surrounding wall plates are connected by welding or bolts; the wet curtain component is vertically arranged between the lower pattern plate and the upper pattern plate; the concentrated solution supply system is positioned at the top of the wet curtain assembly and below the upper pattern plate; the dilute solution drainage system is positioned at the bottom of the wet curtain assembly and above the lower pattern plate; the water spraying system is positioned below the lower flower plate, and the lower water tank is positioned at the bottom of the dehydrator; the overflow pipe is positioned at the overflow water level of the lower water tank, and the drain valve is positioned at the lowest position of the lower water tank; the gas inlet is positioned at the left side or the right side of the lower part of the dehydrator wall plate and is positioned above the overflow water level line of the lower water tank; the support column is connected with the wall plate and the lower water tank through welding or bolts, the dehydrator adopts a water spray precooling and wet curtain solution dehydration integrated structure, the upper half part of the box body in the dehydrator comprises N wet gas channels and N-1 dry gas channels formed by a lower pattern plate, a wet curtain assembly, an upper pattern plate and surrounding wall plates, and a water spray system of the dehydrator is positioned at the lower half part of the box body in the dehydrator.
2. A wet curtain solution dewatering method comprising the dehydrator of claim 1, further comprising the steps of:
1) Determining the main components, the water content, the temperature, the moisture content and the basic parameters of the treated air quantity of the water-containing flue gas at the inlet of the dehydrator, determining the parameters of the water content, the temperature and the moisture content of the flue gas at the outlet of the dehydrator according to the environmental protection requirement, and calculating the total dehydration efficiency of the dehydrator; the moisture content of the inlet of the dehydrator is d1, the moisture content of the smoke emission required by environmental protection is d2, and the total dehydration efficiency of the dehydrator is as follows: ηtotal= (1-d 2/d 1) x100%;
2) After entering from the inlet at the lower part of the dehydrator, the water-containing flue gas is cooled, condensed and dehumidified by a water spraying system; the sprayed water flows out from an overflow pipe on the lower water tank, and the sewage is discharged from a blow-down valve at the bottom of the lower water tank at regular intervals; according to parameters of the temperature and the moisture content of the flue gas after water spraying, parameters of the graded dehydration efficiency of the dehydrator, the water spraying amount, the water spraying discharge number and the water spraying pressure of a spraying system are calculated; the moisture content of the flue gas after water spraying is d3, and the fractional dehydration efficiency eta 1= (1-d 3/d 1) x100%;
3) The water-containing flue gas sprayed by water enters a dry gas channel from a wet gas channel at the upper half part of the middle box body through a wet curtain component, salt solution flows out from the top of the wet curtain component through a concentrated solution liquid supply system, flows down vertically along the wet curtain, absorbs water vapor in the water-containing flue gas and becomes dilute solution, and the dilute solution flows out from a dilute solution liquid discharge system arranged at the bottom of the wet curtain component; at this time, the fractional dehydration efficiency eta 2= (1-d 2/d 3) x100%, the release heat after the water-containing flue gas is dehydrated and dried is equal to the absorption heat after the concentrated solution absorbs water vapor; the parameters of the wet gas channel, the dry gas channel, the wet curtain component area, the concentrated solution liquid supply system and the dilute solution liquid discharge system are calculated according to the parameters of the air flow speed, the graded dehydration efficiency, the solution temperature, the concentration change and the heat exchange heat balance, and the moisture content of the dehydrated and dried flue gas can be adjusted according to the changes of the solution temperature, the concentration and the solution circulation quantity so as to adapt to the requirements of different environments;
4) The flue gas which is subjected to moisture absorption and dehydration through the wet curtain component and meets the environmental protection emission requirement is collected into the upper gas header of the dehydrator through the dry gas channel and is discharged from the gas outlet;
5) And finally, determining the external dimension of the wet curtain solution dehydrator and the medium parameters of the required external interface.
CN201910134889.5A 2019-02-24 2019-02-24 Wet curtain solution dehydrator and dehydration method thereof Active CN109999622B (en)

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CN111330410A (en) * 2020-03-06 2020-06-26 中国农业科学院农业环境与可持续发展研究所 Method and equipment for recovering ammonia gas in exhaust gas of livestock and poultry house

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