CN114061343A - Closed cooling process system utilizing working medium phase-change heat exchange - Google Patents
Closed cooling process system utilizing working medium phase-change heat exchange Download PDFInfo
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- CN114061343A CN114061343A CN202010766401.3A CN202010766401A CN114061343A CN 114061343 A CN114061343 A CN 114061343A CN 202010766401 A CN202010766401 A CN 202010766401A CN 114061343 A CN114061343 A CN 114061343A
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- 238000001816 cooling Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title claims abstract description 24
- 230000008859 change Effects 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 239000000498 cooling water Substances 0.000 claims abstract description 18
- 238000005399 mechanical ventilation Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 239000011555 saturated liquid Substances 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 71
- 230000000694 effects Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 6
- 238000009395 breeding Methods 0.000 abstract description 4
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- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 244000005700 microbiome Species 0.000 abstract description 4
- 230000001932 seasonal effect Effects 0.000 abstract description 4
- 239000003570 air Substances 0.000 description 47
- 230000001105 regulatory effect Effects 0.000 description 9
- 239000013589 supplement Substances 0.000 description 7
- 238000009834 vaporization Methods 0.000 description 6
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- 239000000428 dust Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
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- 239000003245 coal Substances 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
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- Thermal Sciences (AREA)
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
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Abstract
The invention discloses a closed cooling process system utilizing working medium phase change heat exchange, which comprises a liquid working medium pump, an adjusting valve, a phase change heat exchanger and a working medium condenser, thoroughly solves the problem of plume, realizes the effect of water saving, not only changes the severe environment condition of a large amount of plume around an open cooling tower, but also hardly causes water loss of a closed circulating water cooling system, greatly reduces the operating cost, in addition, the phase change heat exchanger can reduce the heat exchange area, saves the initial investment, reduces the occupied space, ensures the water quality, overcomes the defects of common deposit adhesion, pipeline equipment corrosion and microorganism breeding of an open circulating cooling water system, prolongs the service life, and achieves different pressures by changing the opening degree of the adjusting valve when the environmental temperature changes, the temperature of the phase change point is changed accordingly to accommodate seasonal variations.
Description
Technical Field
The invention relates to the technical field of resources and environment, in particular to a technology and a process for cooling circulating water of a large-scale industrial cooling tower, eliminating fog in winter and saving water, and particularly relates to a closed cooling process system utilizing phase change heat exchange of a working medium.
Background
In the industrial fields of coal, petroleum, chemical industry, steel, textile, electric power and the like, a mechanical ventilation cooling tower continuously operating all year round exists, the principle is that hot circulating water is sprayed from the upper surface of the cooling tower and then flows into a water collecting tank, air conveyed by a ventilator flows in the reverse direction with water, water films on fillers are widely contacted with cold air, a mass and heat transfer process is generated, the heat of the circulating water is taken away by utilizing vaporization latent heat of the water in the heat transfer process, the purpose of cooling the circulating water is realized, however, in northern cold regions, in the process of cooling the circulating water by the cold air of the mechanical ventilation cooling tower during running in winter, the cold air is changed into saturated damp and hot air after passing through the interior of the cooling tower and water heat exchange, the saturated damp and hot air is discharged out of the cooling tower to be mixed with the cold air, and cooling and condensation form fog clusters containing a plurality of tiny liquid particle groups, because the height of the mechanical ventilation cooling tower is low, fog clusters drift to influence the visibility of surrounding residential areas and traffic roads, the urban environment is damaged, the humidity of a downwind area rises, fog falls on the ground to cause the road surface around the cooling tower to be wet and slippery or frozen, the safety production of a factory is influenced, the safety operation of production equipment around the cooling tower is influenced, and great potential safety hazards are brought to surrounding traffic.
The existing common cooling tower fog dissipation transformation technology has the following defects that the air cooling, wet cooling and combination type water-saving fog dissipation is very small in unsaturated area in an air enthalpy-humidity diagram due to extremely low outdoor air temperature in winter, and the air is difficult to fall into the unsaturated area after being mixed by adjusting the air volume ratio of the finned tube heat exchanger and the cooling tower, although the scheme has certain fog dissipation and water saving effects, the scheme only treats the air to an unsaturated state point, does not change the essence that the heat dissipation capacity of circulating water is taken away by using the vaporization latent heat of water, is still wet cooling, still needs to supplement water into the circulating water, and the fog dissipation and water saving effects are obviously reduced when the environmental temperature is lower than a design value; thus the tower body height is increased in the electromagnetism fog dispersal room that needs to be newly built to electromagnetism dust removal fog dispersal, and must remove the electromagnetism fog dispersal room when the cooling tower overhauls, causes a great deal of inconvenience. Meanwhile, the power consumption needs to be increased, the white fog of the cooling tower is cleaner than the smoke, but the gathering effect of water drops after the magnetization of an electromagnetic field is influenced, and circulating water still needs to be supplemented and still belongs to wet cooling; the heating method demisting is still wet cooling, and part of circulating water is changed into water vapor of unsaturated air and is discharged into the atmosphere, so that water is not saved, a heat exchanger needs to be arranged in the cooling tower, the load of the cooling tower is increased, an external heat source needs to be introduced for heating the wet saturated air, and the energy consumption is increased; the three technical schemes respectively adopt different modes to change wet saturated air after heat absorption and vaporization into unsaturated air, the unsaturated air is discharged into the air and cannot be condensed into fog clusters containing tiny liquid particle groups, the aim of defogging is achieved, even if the unsaturated air still takes away part of circulating water, the essence of wet cooling is not changed, the system still needs to supplement a large amount of circulating water, and therefore a closed cooling process system utilizing working medium phase change heat exchange is provided.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the existing defects, and provide a closed cooling process system utilizing working medium phase change heat exchange, wherein the working medium exchanges heat with circulating water in a phase change heat exchanger, the working medium evaporates to absorb the heat of the circulating water and exchanges heat with air in a working medium condenser to release the heat into the air, the circulation of the working medium between the phase change heat exchanger and the working medium condenser is completed by a liquid working medium pump, the heat of the circulating water is transferred to the atmosphere in an indirect mode, rather than taking away the heat in the circulating water by vaporization latent heat of water as in the original mechanical ventilation cooling tower, so the closed cooling system can replace the original mechanical ventilation cooling tower, thoroughly solve the problem of the fog, realize the water-saving effect, and avoid the loss of the circulating water caused by the direct contact of the circulating water and the air, the poor environment condition of a large amount of fog around the open type cooling tower is changed, the closed type circulating water cooling system hardly has water loss, the operation cost is greatly reduced, in addition, the phase change heat exchanger can reduce the heat exchange area, save the initial investment, reduce the occupied space, and only needs little water supplement, so the operation cost of the system is greatly reduced, the circulating cooling water in the whole circulating system is completely closed and does not contact with the air, oxygen and dust impurities in the air cannot enter the system, not only can the water quality be ensured, the defects of common deposit adhesion, pipeline equipment corrosion and microorganism breeding of the open type circulating cooling water system are overcome, the service life is prolonged, the water loss cannot be generated, the air absorbs heat in a condenser and is heated to be discharged into the atmosphere, the fog phenomenon cannot be generated even in cold winter, and the environment temperature changes, the opening degree of the regulating valve is changed to reach different pressures, and accordingly the temperature of the phase change point is changed to adapt to seasonal changes.
In order to achieve the purpose, the invention provides the following technical scheme:
the closed cooling process system comprises a liquid working medium pump, a regulating valve, a phase-change heat exchanger and a working medium condenser, wherein the discharge end of the liquid working medium pump is connected with the phase-change heat exchanger through the regulating valve, the discharge end of the phase-change heat exchanger is connected with the working medium condenser, and the discharge end of the working medium condenser is connected with the liquid working medium pump.
Preferably, the closed cooling process system using working medium phase-change heat exchange comprises the following processes:
and S1, an industrial circulating cooling water loop, wherein circulating cooling water from the production process enters the phase change heat exchanger to exchange heat with the working medium, the working medium evaporates to absorb heat, and the circulating cooling water returns to the production process system after being cooled to be recycled.
S2, a working medium circulation loop, wherein the working medium absorbs heat and vaporizes in the phase change heat exchanger, then enters the working medium condenser to exchange heat with outdoor cold air, the condensed liquid is boosted by the liquid working medium pump, the liquid is throttled by the regulating valve and adjusted to the saturation pressure corresponding to the design temperature, and the saturated liquid reaching the design temperature returns to the phase change heat exchanger to complete the circulation of the working medium.
S3, in the ventilation cooling link, outdoor air and working media perform countercurrent heat exchange in the working media condenser in a mechanical ventilation mode to absorb condensation heat of the working media, and the outdoor air is exhausted into the atmosphere after the humidity and temperature rise, so that the plume phenomenon cannot be generated.
The invention has the following beneficial effects:
the working medium is utilized to exchange heat with the circulating water in the phase-change heat exchanger, the working medium evaporates and absorbs the heat of the circulating water, and exchanges heat with the air in the working medium condenser to release the heat into the air, the circulation of the working medium between the phase-change heat exchanger and the working medium condenser is completed by the liquid working medium pump, the heat of the circulating water is transferred to the atmosphere in an indirect mode, and the heat in the circulating water is not taken away by the latent heat of vaporization of water as in the prior mechanical ventilation cooling tower, so the closed cooling system can replace the prior mechanical ventilation cooling tower, thoroughly solve the problem of the fog, realize the water-saving effect, avoid the loss of the circulating water due to the generation of the fog caused by the direct contact of the circulating water and the air, change the severe environment condition of a large amount of the fog at the periphery of the open cooling tower, and almost no water loss of the circulating water cooling system, the operation cost is greatly reduced, in addition, the phase change heat exchanger can reduce the heat exchange area, the initial investment is saved, the occupied space is reduced, and the system only needs little water supplement, so the operation cost of the system is greatly reduced, the circulating cooling water in the whole circulating system is completely closed and does not contact with air, oxygen and dust impurities in the air cannot enter the system, the water quality can be ensured, the defects of common deposit adhesion, pipeline equipment corrosion and microorganism breeding in a large amount of open circulating cooling water systems are overcome, the service life is prolonged, the loss of water cannot be generated, the air absorbs heat in a condenser, is heated and is discharged into the atmosphere, the fog phenomenon cannot be generated even in cold winter, when the environmental temperature changes, different pressures are reached by changing the opening degree of the regulating valve, the temperature of a phase change point is correspondingly changed, and the seasonal change is adapted.
Drawings
FIG. 1 is a schematic process flow diagram of a closed cooling process system using phase change heat exchange of a working medium according to the present invention.
In the figure: 1. a liquid working medium pump; 2. adjusting a valve; 3. a phase change heat exchanger; 4. and a working medium condenser.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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.
Example 1
The closed cooling process system comprises a liquid working medium pump, a regulating valve, a phase-change heat exchanger and a working medium condenser, wherein the discharge end of the liquid working medium pump is connected with the phase-change heat exchanger through the regulating valve, the discharge end of the phase-change heat exchanger is connected with the working medium condenser, and the discharge end of the working medium condenser is connected with the liquid working medium pump.
Preferably, the closed cooling process system using working medium phase-change heat exchange comprises the following processes:
and S1, an industrial circulating cooling water loop, wherein circulating cooling water from the production process enters the phase change heat exchanger to exchange heat with the working medium, the working medium evaporates to absorb heat, and the circulating cooling water returns to the production process system after being cooled to be recycled.
S2, a working medium circulation loop, wherein the working medium absorbs heat and vaporizes in the phase change heat exchanger, then enters the working medium condenser to exchange heat with outdoor cold air, the condensed liquid is boosted by the liquid working medium pump, the liquid is throttled by the regulating valve and adjusted to the saturation pressure corresponding to the design temperature, and the saturated liquid reaching the design temperature returns to the phase change heat exchanger to complete the circulation of the working medium.
S3, in the ventilation cooling link, outdoor air and working media perform countercurrent heat exchange in the working media condenser in a mechanical ventilation mode to absorb condensation heat of the working media, and the outdoor air is exhausted into the atmosphere after the humidity and temperature rise, so that the plume phenomenon cannot be generated.
Example 2
The utility model provides an utilize closed cooling process system of working medium phase transition heat transfer, takes the mechanical draft counterflow cooling tower of power generation system condensation as the contrast, and single tower design water yield is 5000m3/h, design operating mode: the air dry bulb temperature is 32 ℃, the wet bulb temperature is 28.5 ℃, the atmospheric pressure is 100040Pa, and the operation conditions are as follows: the temperature of the circulating cooling water entering the tower is 40 ℃, and the temperature of the circulating cooling water leaving the tower is 31 ℃. The cooling tower axis dimension is 18.8m by 18.8 m.
In the implementation case, the working medium condenser is considered according to the temperature difference of 4 ℃ during the operation in summer, under the design working condition that the air dry bulb temperature is 32 ℃, the phase change temperature of the working medium is 36 ℃, the air temperatures in other seasons are lower than the design working condition, correspondingly, the phase change temperature of the working medium is reduced, the pressure behind the valve can be changed through the adjusting valve so as to reach the saturation pressure corresponding to the phase change temperature, and the cooling requirement of the circulating water can be completely met.
The water supplement rate of the open mechanical ventilation cooling tower is 3%, the water supplement amount of a single tower is 150m3/h, the implementation case is a closed circulation cooling system, no water is lost, the operation is calculated according to the current water price of 6.00 yuan/m 3 and 8000 hours all the year, and the implementation scheme can save 720 ten thousand yuan of operation cost only by one water cost all the year.
In summary, the following steps: the invention provides a closed cooling process system utilizing working medium phase change heat exchange, which utilizes the working medium to exchange heat with circulating water in a phase change heat exchanger, the working medium evaporates and absorbs the heat of the circulating water, and exchanges heat with air in a working medium condenser to release the heat into the air, the circulation of the working medium between the phase change heat exchanger and the working medium condenser is completed by a liquid working medium pump, the heat of the circulating water is transferred to the atmosphere by an indirect mode, and the heat in the circulating water is not taken away by latent heat of vaporization of water like the original mechanical ventilation cooling tower, so the closed cooling system can replace the original mechanical ventilation cooling tower, thoroughly solve the problem of fog, realize the water-saving effect, avoid generating fog due to the direct contact of the circulating water and the air and causing the loss of the circulating water, not only change the severe environment condition of a large amount of fog around the open cooling tower, the closed circulating water cooling system has almost no water loss, greatly reduces the operation cost, in addition, the phase change heat exchanger can reduce the heat exchange area, saves the initial investment, reduces the occupied space, and only needs little water supplement, thereby greatly reducing the operation cost of the system, the circulating cooling water in the whole circulating system is completely closed and does not contact with the air, oxygen and dust impurities in the air can not enter the system, not only can ensure the water quality, but also overcome the defects of common deposit adhesion, pipeline equipment corrosion and microorganism breeding in an open circulating cooling water system, prolong the service life, can not generate water loss, the air absorbs heat in a condenser, is heated and is discharged into the atmosphere, the fog phenomenon can not be generated even in cold winter, when the environmental temperature changes, the opening degree of the regulating valve is changed to reach different pressures, and the temperature of a phase change point is correspondingly changed, to accommodate seasonal variations.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (2)
1. The utility model provides an utilize closed cooling process system of working medium phase transition heat transfer, includes liquid working medium pump (1), governing valve (2), phase change heat exchanger (3) and working medium condenser (4), liquid working medium pump (1) discharge end is connected with phase change heat exchanger (3) through governing valve (2), phase change heat exchanger (3) discharge end is connected with working medium condenser (4), working medium condenser (4) discharge end is connected with liquid working medium pump (1).
2. The closed cooling process system utilizing the phase-change heat exchange of the working medium as claimed in claim 1, wherein: the closed cooling process system utilizing the phase change heat exchange of the working medium comprises the following processes:
and S1, an industrial circulating cooling water loop, wherein circulating cooling water from the production process enters the phase change heat exchanger (3) to exchange heat with the working medium, the working medium evaporates to absorb heat, and the circulating cooling water returns to the production process system after being cooled for recycling.
S2, a working medium circulation loop, wherein the working medium absorbs heat and is evaporated in the phase change heat exchanger (3), then enters the working medium condenser (4) to exchange heat with outdoor cold air, is condensed into liquid, is boosted by the liquid working medium pump (1), is throttled by the adjusting valve (2) to be adjusted to a saturation pressure corresponding to a design temperature, and the saturated liquid reaching the design temperature returns to the phase change heat exchanger (3) to complete the circulation of the working medium.
S3, a ventilation cooling link, wherein outdoor air and the working medium perform countercurrent heat exchange in the working medium condenser (4) in a mechanical ventilation mode, the condensation heat of the working medium is absorbed, and after humidity and temperature rise, the outdoor air is discharged into the atmosphere, so that the plume phenomenon cannot be generated.
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| CN202010766401.3A CN114061343A (en) | 2020-08-03 | 2020-08-03 | Closed cooling process system utilizing working medium phase-change heat exchange |
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| CN202010766401.3A CN114061343A (en) | 2020-08-03 | 2020-08-03 | Closed cooling process system utilizing working medium phase-change heat exchange |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116717953A (en) * | 2023-05-04 | 2023-09-08 | 晨曦能源科技有限公司 | Closed-loop phase-change cooling system |
| CN117318319A (en) * | 2023-11-28 | 2023-12-29 | 百穰新能源科技(深圳)有限公司 | Carbon dioxide energy storage system and method using carbon dioxide as condensation working medium |
-
2020
- 2020-08-03 CN CN202010766401.3A patent/CN114061343A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116717953A (en) * | 2023-05-04 | 2023-09-08 | 晨曦能源科技有限公司 | Closed-loop phase-change cooling system |
| CN117318319A (en) * | 2023-11-28 | 2023-12-29 | 百穰新能源科技(深圳)有限公司 | Carbon dioxide energy storage system and method using carbon dioxide as condensation working medium |
| CN117318319B (en) * | 2023-11-28 | 2024-03-19 | 百穰新能源科技(深圳)有限公司 | Carbon dioxide energy storage system and method using carbon dioxide as condensation working medium |
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