CN117654227A - Pretreatment device and method for air separation system for cooling tower water recovery - Google Patents
Pretreatment device and method for air separation system for cooling tower water recovery Download PDFInfo
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- CN117654227A CN117654227A CN202311843058.8A CN202311843058A CN117654227A CN 117654227 A CN117654227 A CN 117654227A CN 202311843058 A CN202311843058 A CN 202311843058A CN 117654227 A CN117654227 A CN 117654227A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 238000001816 cooling Methods 0.000 title claims abstract description 79
- 238000000926 separation method Methods 0.000 title claims abstract description 42
- 238000011084 recovery Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 12
- 239000003570 air Substances 0.000 claims abstract description 119
- 239000012080 ambient air Substances 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims description 31
- 239000000498 cooling water Substances 0.000 claims description 12
- 239000002826 coolant Substances 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 230000005494 condensation Effects 0.000 abstract description 2
- 238000009833 condensation Methods 0.000 abstract description 2
- 238000002203 pretreatment Methods 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 239000003595 mist Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
- B01D53/26—Drying gases or vapours
-
- 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
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/28—Methods or installations for obtaining or collecting drinking water or tap water from humid air
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Water Supply & Treatment (AREA)
- Public Health (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Drying Of Gases (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The utility model discloses a pretreatment device and a pretreatment method for an air separation system for cooling tower water recovery. The utility model utilizes a water separation mode combining mechanical compression and cooling condensation to realize secondary recovery of circulating water contained in the exhaust gas of the industrial cooling tower, and reduces waste of water resources. In addition, as a pretreatment device, the generated dry high-pressure gas can be directly applied to a subsequent air separation system. When the air treatment capacity of the pretreatment device is larger than that of a subsequent air separation system, redundant air flow can be separated, and ambient air is led to the cooling tower through the ejector, so that the power consumption of a fan in the cooling tower is reduced, and the energy utilization rate of the system is improved.
Description
Technical Field
The utility model belongs to the technical field of cooling water recovery and air separation equipment, and particularly relates to an air separation system pretreatment device and method suitable for recovering industrial cooling tower circulating water.
Background
Industrial cooling towers are widely used in the industries of chemical industry, pharmacy, petroleum processing, food production and the like, and heat generated in various industrial production processes is dissipated by evaporation through contact of circulating water with waste heat and air. In the heat exchange process, air carries a large amount of circulating cooling water in the form of water vapor or water mist to enter the environment atmosphere, so that floating water loss and evaporation loss are formed, and the upstream of the production process is forced to continuously supply water, so that serious resource and energy waste are caused. In addition, the vapor in the wet air condenses to form water mist above the cooling tower, floats in the atmosphere along with the airflow, and causes great trouble of environmental protection to local residents.
Patent publication No. CN 204612523U discloses a cooling tower evaporation water recovery device, which is provided with a heat exchanger inside the cooling tower, and recovers water in the cooling tower exhaust gas through a condensate cover. The national intellectual property office discloses an utility model patent application document with the publication number of CN 205897943U and the name of a cooling water recovery device of an open cooling tower in 1 month 18 of 2017, and the device recovers and recycles the overflowed cooling water in the open cooling tower by adding a water collector and an auxiliary control system on the basis of the cooling tower.
Among the above-mentioned two technical schemes, reform transform to cooling tower inner structure, cool off before the air leaves the cooling tower, can play certain recovery cooling water effect. However, some moisture in the air leaving the cooling tower is not recovered, and the maintenance of the equipment is difficult due to the improvement of the internal structure of the cooling tower.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a pretreatment device and a pretreatment method which can fully recycle circulating water in wet air discharged by an industrial cooling tower and treat generated high-pressure gas for an air separation system, and can solve the technical problems of low water recycling efficiency and difficult equipment maintenance of the cooling tower in the prior art.
In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:
the utility model discloses an air separation system pretreatment device for cooling tower water recovery, which comprises a compressor, a cooler, a gas-water separator, a first regulating valve, an ejector, a second regulating valve and a dryer;
the wet air exhaust port of the cooling tower is connected with the air inlet of the compressor; the air inlet of the cooler is connected with the air outlet of the compressor, and the air outlet of the cooler is connected with the air inlet of the gas-water separator; the air outlet of the gas-water separator is divided into two paths, one path is connected with the air inlet of the ejector through a first regulating valve, and the other path is connected with the air inlet of the dryer through a second regulating valve; the dryer exhaust port is connected to an air separation system.
Preferably, a demister is further arranged between the cooling tower wet air exhaust port and the compressor, the demister air inlet is connected with the cooling tower wet air exhaust port, and the demister air exhaust port is connected with the compressor air inlet.
Preferably, the primary separated water produced by the demister and the secondary separated water produced by the gas-water separator are collectively collected into the cooling tower system.
Preferably, when the high-pressure air generated by the compressor is lower than the demand of the subsequent air separation system, the second regulating valve is opened, and the opening degree is regulated according to the flow rate, and the first regulating valve is closed.
Preferably, when the high-pressure air generated by the compressor is higher than the demand of the subsequent air separation system, the second regulating valve is fully opened, the first regulating valve is opened, and the opening degree is adjusted according to the remaining amount of the high-pressure air.
Preferably, when the first regulating valve is opened, the ejector uses the high pressure gas to drain ambient air, and the ejector gas is introduced into the cooling tower below the cooling tower.
Preferably, the cooler adopts a countercurrent heat exchange mode.
Preferably, the cooler uses ambient air as a coolant.
The utility model also discloses a method for recovering cooling tower water and separating air by the pretreatment device of the air separation system for recovering cooling tower water, which comprises the following steps:
wet air discharged from the cooling tower enters a compressor for pressurization, and cooling is performed by a cooler, and cooling water is separated out from the gas-water separator; the high-pressure air discharged from the gas-water separator is dried by a dryer under the control of a second regulating valve and then is supplied to a subsequent air separation system for use; when the high-pressure air quantity discharged by the air-water separator is larger than the demand of a subsequent air separation system, the redundant high-pressure air is led to the cooling tower through the ejector under the control of the first regulating valve.
Preferably, the wet air discharged from the cooling tower enters the compressor for pressurization after demisting through the demister; the primary separation water generated by the demister and the secondary separation water generated by the gas-water separator flow into the cooling tower together to be used as circulating water recovered by the whole device.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model discloses a pretreatment device of an air separation system for recycling cooling tower water, which is characterized in that wet air discharged by a cooling tower is compressed by a compressor and cooled by a cooler, cooling water is separated out from a gas-water separator, and the secondary recycling of circulating water contained in discharged gas of an industrial cooling tower is realized by utilizing a water separation mode combining mechanical compression and cooling condensation, so that the waste of water resources is reduced. Meanwhile, as a pretreatment device, high-pressure air discharged from the gas-water separator can be directly applied to a subsequent air separation system after passing through the dryer under the control of the second regulating valve, and when the high-pressure air is excessive, the high-pressure air can be led to the cooling tower through the ejector under the control of the first regulating valve, so that the power consumption of a fan inside the cooling tower is reduced, and the energy utilization rate of the system is improved. The method realizes that wet air discharged by the cooling tower is treated while the high-pressure gas is produced and supplied to the air separation system, and cooling circulating water lost by evaporation is recovered, so that the running cost of the cooling circulating system is reduced.
Further, a demister is provided between the cooling tower wet air exhaust port and the compressor, so that mist contained in the wet air can be captured and recycled.
Furthermore, the countercurrent heat exchange mode is adopted, the required heat transfer area is small, the materials are saved, and the heat exchange efficiency is high.
Drawings
FIG. 1 is a schematic view of the apparatus of the present utility model;
FIG. 2 is a plot of evaporative loss cooling water recovery ratio data for different compressor discharge pressures and cooling temperatures.
Wherein: 1-a demister; a 2-compressor; a 3-cooler; a 4-gas-water separator; 5-a first regulating valve; 6-an ejector; 7-a second regulating valve; 8-dryer.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The utility model is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1, a pretreatment device of an air separation system for cooling tower water recovery comprises a demister 1, a compressor 2, a cooler 3, a gas-water separator 4, a first regulating valve 5, an ejector 6, a second regulating valve 7 and a dryer 8; the air inlet of the demister 1 is connected with the wet air outlet of the cooling tower, and the air outlet of the demister 1 is connected with the air inlet of the compressor 2; the air inlet of the cooler 3 is connected with the air outlet of the compressor 2, and the air outlet of the cooler 3 is connected with the air inlet of the gas-water separator 4; the exhaust port of the gas-water separator 4 is divided into two paths, one path is connected with the air inlet of the ejector 6 through the first regulating valve 5, and the other path is connected with the air inlet of the dryer 8 through the second regulating valve 7; the exhaust port of the dryer 8 is connected with an air separation system.
Based on the pretreatment device of the air separation system for cooling tower water recovery, the pretreatment device of the air separation system for cooling tower water recovery of the utility model comprises the following steps:
the circulating cooling water carrying waste heat exchanges heat with air in a cooling tower, and simultaneously has an evaporation effect, and the cooling tower discharges wet air containing water mist. The air flow is defogged in the defogger 1, enters the compressor 2 for pressurization, is cooled by the cooler 3, and then is separated out of cooling water in the gas-water separator 4. The high-pressure air is discharged from the gas-water separator, is further dehumidified by a dryer 8, and is supplied to a subsequent air separation system. When the air treatment capacity of the pretreatment device is larger than that of a subsequent air separation system, redundant air flow can be separated, and the air treatment capacity of the pretreatment device can be utilized to guide ambient air to a cooling tower through an ejector 6. The primary separated water obtained by the demister 1 and the secondary separated water obtained by the gas-water separator 4 are converged into circulating water recovered by the whole device, so that the functionality of the system is embodied.
For the treatment of the circulating water in a certain industrial process, the treatment capacity of the circulating water is 3000m 3 The evaporation loss of the cooling tower per hour is 1.5%, the power of the original fan in the tower is 150kW, and the exhaust gas of the cooling tower is saturated wet air containing liquid drops. The cooler 3 is cooled with ambient air, and the evaporation loss cooling water recovery ratio data curve shown in fig. 2 is calculated when the compressors 2 of different discharge pressures are used, considering that the high-pressure saturated humid air is cooled to different temperatures (20, 30, 40 ℃) in different seasons and climates. It can be seen that when the discharge pressure of the compressor 2 reaches 0.8MPaWhen the wet air is cooled to 40 ℃, the circulating water lost by evaporation of the cooling tower can still be recovered by more than 80%, and the water recovery effect is remarkable.
The above is only for illustrating the technical idea of the present utility model, and the protection scope of the present utility model is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present utility model falls within the protection scope of the claims of the present utility model.
Claims (10)
1. The pretreatment device of the air separation system for cooling tower water recovery is characterized by comprising a compressor (2), a cooler (3), a gas-water separator (4), a first regulating valve (5), an ejector (6), a second regulating valve (7) and a dryer (8);
the wet air exhaust port of the cooling tower is connected with the air inlet of the compressor (2); an air inlet of the cooler (3) is connected with an air outlet of the compressor (2), and an air outlet of the cooler (3) is connected with an air inlet of the gas-water separator (4); the exhaust port of the gas-water separator (4) is divided into two paths, one path is connected with the air inlet of the ejector (6) through a first regulating valve (5), and the other path is connected with the air inlet of the dryer (8) through a second regulating valve (7); the exhaust port of the dryer (8) is connected with the air separation system.
2. The pretreatment device of an air separation system for cooling tower water recovery according to claim 1, wherein a demister (1) is further provided between the cooling tower wet air exhaust port and the compressor (2), an air inlet of the demister (1) is connected to the cooling tower wet air exhaust port, and an air outlet of the demister (1) is connected to an air inlet of the compressor (2).
3. Pretreatment device of an air separation system for cooling tower water recovery according to claim 2, characterized in that the primary separated water produced by the demister (1) and the secondary separated water produced by the gas-water separator (4) are brought together into the cooling tower system.
4. Pretreatment device of an air separation system for cooling tower water recovery according to claim 1, characterized in that the second regulating valve (7) is opened and the opening is adjusted according to the flow, the first regulating valve (5) is closed when the high pressure air generated by the compressor (2) is lower than the demand of the subsequent air separation system.
5. Pretreatment device of an air separation system for cooling tower water recovery according to claim 1, characterized in that when the high pressure air generated by the compressor (2) is higher than the demand of the subsequent air separation system, the second regulating valve (7) is fully opened, the first regulating valve (5) is opened, and the opening degree is adjusted according to the surplus of the high pressure air.
6. Pretreatment device of an air separation system for cooling tower water recovery according to claim 5, characterized in that the ejector (6) uses high pressure gas to drain ambient air when the first regulating valve (5) is opened, guiding the ejector gas into the cooling tower below the cooling tower.
7. Pretreatment device for air separation systems for cooling tower water recovery according to claim 1, characterized in that the cooler (3) is in countercurrent heat exchange.
8. Pretreatment device of an air separation system for cooling tower water recovery according to claim 1, characterized in that the cooler (3) uses ambient air as coolant.
9. A method for recovering cooling tower water and separating air using the pretreatment device for an air separation system for cooling tower water recovery according to any one of claims 1 to 8, comprising:
wet air discharged from the cooling tower enters the compressor (2) for pressurization, and cooling water is separated out from the gas-water separator (4) after being cooled by the cooler (3); the high-pressure air discharged from the gas-water separator (4) is dried by a dryer (8) under the control of a second regulating valve (7) and then is supplied to a subsequent air separation system for use; when the high-pressure air quantity discharged by the air-water separator (4) is larger than the demand of a subsequent air separation system, the redundant high-pressure air is guided to the cooling tower through the ejector (6) under the control of the first regulating valve (5).
10. The method for recovering cooling tower water and separating air according to claim 9, wherein a demister (1) is further arranged between the cooling tower wet air exhaust port and the compressor (2), and wet air discharged from the cooling tower enters the compressor (2) for pressurization after being demisted by the demister (1); the primary separated water generated by the demister (1) and the secondary separated water generated by the gas-water separator (4) are converged and flow into a cooling tower to be used as circulating water recovered by the whole device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311843058.8A CN117654227A (en) | 2023-12-28 | 2023-12-28 | Pretreatment device and method for air separation system for cooling tower water recovery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311843058.8A CN117654227A (en) | 2023-12-28 | 2023-12-28 | Pretreatment device and method for air separation system for cooling tower water recovery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117654227A true CN117654227A (en) | 2024-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311843058.8A Pending CN117654227A (en) | 2023-12-28 | 2023-12-28 | Pretreatment device and method for air separation system for cooling tower water recovery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117654227A (en) |
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2023
- 2023-12-28 CN CN202311843058.8A patent/CN117654227A/en active Pending
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