Pre-cooling heat exchange device for evaporative condenser

Abstract

The pre-cooling heat exchange device comprises a box body, a V-shaped heat exchanger, a water baffle and a main heat exchanger, the water baffle is arranged in the box body and divides the inner space of the box body into an upper static pressure cavity and a lower cavity, the upper static pressure cavity is located above the lower cavity, and the V-shaped heat exchanger is arranged in the upper static pressure cavity. The V-shaped heat exchanger is arranged in the upper static pressure cavity, the main heat exchanger is arranged in the lower static pressure cavity, a steam inlet and a liquid outlet are formed in the outer surface of the box body, one end of the V-shaped heat exchanger is connected to the steam inlet, one end of the main heat exchanger is connected to the liquid outlet, and the other end of the main heat exchanger is connected to the liquid outlet. And the other end of the main heat exchanger is connected with the other end of the V-shaped heat exchanger in series. The heat exchange area is larger, so that the performance of the evaporative condenser is greatly improved, and the aspects of energy saving, water saving, scaling delaying, cooling water drifting and the like are greatly changed; and the geographical limitation of the conventional evaporative condenser is solved.

Description

Technical Field

[0001] The utility model relates to a precooling heat exchange device for an evaporative condenser. Background Art

[0002] With the continuous development of society, people's requirements and expectations for life are getting higher and higher, and energy loss and environmental pollution are increasing. In the field of refrigeration, air conditioning and heat pump heating, there are many problems in the technical level, design, installation and use of equipment units. According to authoritative statistics, greenhouse gas emissions in the HVAC field can account for 15% of my country's greenhouse gas emissions, and in the energy consumption of large energy-consuming buildings, it accounts for more than half, reaching 60%. Therefore, if the technical level of equipment units can be improved, it will be of great significance to energy conservation and emission reduction, and will also create social economic benefits and value.

[0003] The energy-saving and water-saving cooling effect of the evaporative condenser is more significant in condensing heat exchange equipment, and it has a wide range of applications. It can be used in air conditioning, food refrigeration, chemical production and other fields to provide the required low-temperature environment and requirements. However, there are still many problems with evaporative condensers at this stage, such as the drifting and misting of cooling water, and the prominent scaling phenomenon after long-term use, which seriously affects the condensation effect of the equipment. Under extremely harsh environmental conditions, the condensation pressure fluctuates greatly, the condensation temperature is high, and the equipment operation effect is poor. If the existing equipment can be optimized at the technical level to solve or improve the existing operating problems and improve the operating performance of the equipment, it will not only be a promotion in terms of social economy, energy saving and environmental protection, but it also has very practical significance and value. Optimizing and improving evaporative condensers has far-reaching significance for saving energy and protecting the environment. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art. The utility model provides a precooling heat exchange device for an evaporative condenser.

[0005] The utility model is realized by the following technical solutions:

[0006] A precooling heat exchange device for an evaporative condenser comprises a box body, a V-shaped heat exchanger, a water baffle and a main heat exchanger, wherein the water baffle is arranged in the box body and divides the internal space of the box body into an upper static pressure cavity and a lower cavity, wherein the upper static pressure cavity is located above the lower cavity, the V-shaped heat exchanger is arranged in the upper static pressure cavity, the main heat exchanger is arranged in the lower cavity, a steam inlet and a liquid outlet are provided on the outer surface of the box body, one end of the V-shaped heat exchanger is connected to the steam inlet, one end of the main heat exchanger is connected to the liquid outlet, and the other end of the main heat exchanger is connected in series with the other end of the V-shaped heat exchanger.

[0007] Furthermore, an air outlet is provided on the top of the box body, and the air outlet is communicated with the upper static pressure cavity. The precooling heat exchange device for the evaporative condenser also includes a fan, and the fan is arranged at the air outlet.

[0008] Furthermore, the bottom of the V-shaped heat exchanger is arranged symmetrically in a V shape and faces away from the air outlet.

[0009] Furthermore, the V-shaped heat exchanger is a fin tube precooling heat exchanger.

[0010] Furthermore, an air inlet is opened on the side of the box body, and the air inlet is communicated with the lower cavity. The precooling heat exchange device for the evaporative condenser also includes an air inlet grille, and the air inlet grille is arranged at the air inlet.

[0011] Furthermore, the pre-cooling heat exchange device for the evaporative condenser also includes a circulation pipeline and a spray device, the bottom of the lower cavity has a water collection area, the spray device is located above the main heat exchanger, one end of the circulation pipeline is connected to the box body and communicates with the water collection area, and the other end of the circulation pipeline is connected to the spray device to form circulating cooling water between the spray device, the water collection area, and the circulation pipeline.

[0012] Furthermore, the circulation pipeline is provided with a water pump.

[0013] Furthermore, the precooling heat exchange device for the evaporative condenser also includes a water supply pipe, which is connected to the box body and communicates with the water collection area.

[0014] Furthermore, the precooling heat exchange device for the evaporative condenser also includes a float valve, which is located in the box body, and one end of the float valve is arranged in the water collection area, and the other end of the float valve is connected to the water supply pipe and is used to control the opening and closing of the water supply pipe.

[0015] The beneficial effects of the utility model are:

[0016] The utility model is a precooling heat exchange device for an evaporative condenser. The internal space of the box is divided into an upper static pressure cavity and a lower cavity by a water baffle. The V-shaped heat exchanger is arranged in the upper static pressure cavity, so that a larger heat exchange area is achieved, and it is beneficial to the shedding of condensed water during frost, the flow of refrigerant, and the accumulation of lubricating oil. The performance of the evaporative condenser is greatly improved, and there are great changes in energy saving, water saving, delay of scaling, and the drifting of cooling water. The operating efficiency of the unit is improved, and the requirements of efficient energy saving and emission reduction are achieved. At the same time, the heat exchange area is increased, which can increase the scope of application, and can be operated dry in winter, solving the previous regional limitations of evaporative condensers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the internal structure of a precooling heat exchange device for an evaporative condenser according to an embodiment of the utility model.

[0018] Figure 2 It is a schematic structural diagram of a V-shaped heat exchanger according to an embodiment of the utility model.

[0019] Description of reference numerals:

[0020] Box 1

[0021] Upper static pressure chamber 11

[0022] Lower cavity 12

[0023] Intake pipe 13

[0024] Liquid outlet pipe 14

[0025] Catchment Area 15

[0026] Water retaining plate 2

[0027] V-type heat exchanger 3

[0028] Main heat exchanger 4

[0029] Fan 5

[0030] Air intake grille 6

[0031] Circulation line 7

[0032] Water pump 71

[0033] Spraying device 8

[0034] Water supply pipe 9

[0035] Float valve 10 DETAILED DESCRIPTION

[0036] The following descriptions of the embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented.

[0037] like Figure 1 and Figure 2 As shown, this embodiment discloses a precooling heat exchange device for an evaporative condenser, which includes a housing 1, a V-shaped heat exchanger 3, a water baffle 2 and a main heat exchanger 4. The water baffle 2 is arranged in the housing 1 and divides the internal space of the housing 1 into an upper static pressure cavity 11 and a lower cavity 12. The upper static pressure cavity 11 is located above the lower cavity 12. The V-shaped heat exchanger 3 is arranged in the upper static pressure cavity 11, and the main heat exchanger 4 is arranged in the lower cavity 12. A steam inlet and a liquid outlet are provided on the outer surface of the housing 1. One end of the V-shaped heat exchanger 3 is connected to the steam inlet, one end of the main heat exchanger 4 is connected to the liquid outlet, and the other end of the main heat exchanger 4 is connected in series with the other end of the V-shaped heat exchanger 3.

[0038] In this embodiment, an air inlet pipe 13 is provided at the steam inlet, and the air inlet pipe 13 is connected to the V-type heat exchanger 3. A liquid outlet pipe 14 is provided at the liquid outlet, and the liquid outlet pipe 14 is connected to the main heat exchanger 4. When the evaporative condenser is working, the high-temperature and high-pressure refrigerant vapor from the compressor first enters the V-type heat exchanger 3 through the air inlet pipe 13, and after the V-type heat exchanger 3 performs sensible heat exchange with the low-temperature and high-humidity air in the upper static pressure cavity 11, the high-temperature and high-pressure refrigerant changes from a superheated state to a saturated state through heat release in the V-type heat exchanger 3; the saturated refrigerant vapor enters the main heat exchanger 4 in the lower cavity 12 through the solenoid valve, exchanges heat with the water film and air, and changes from a gaseous state to a liquid state through heat release, and is finally discharged through the liquid outlet pipe 14.

[0039] The internal space of the box body 1 is divided into an upper static pressure cavity 11 and a lower cavity 12 by the water baffle 2, so that the upper space of the entire box body 1 can form an upper static pressure cavity 11, and the V-type heat exchanger 3 is arranged in the upper static pressure cavity 11. The water baffle 2 in the box body 1 can remove water droplets mixed in the rising airflow to prevent the V-type heat exchanger 3 from scaling; at the same time, the heat exchange coil in the V-type heat exchanger 3 is installed obliquely along the flow direction of the refrigerant. Compared with the general fin precooler, the heat exchange area of ​​the V-type heat exchanger 3 is larger. On the one hand, it is conducive to the shedding of condensed water during frost, and on the other hand, it is conducive to the flow of refrigerant and prevents the accumulation of lubricating oil; the performance of the evaporative condenser is greatly improved, and there are great changes in energy saving, water saving, delay of scaling, and the drifting of cooling water, etc., which improves the operating efficiency of the unit and achieves the requirements of high-efficiency energy saving and emission reduction. At the same time, the heat exchange area is increased, which can increase the scope of application, can be operated dry in winter, and can be used as an air-cooled evaporative type, so as to achieve "one machine for two uses". At present, evaporative condensers are mostly used in projects in the south. After this optimization, we can try to use this unit in the north, solving the previous regional limitations of evaporative condensers.

[0040] An air outlet is provided at the top of the box 1, and the air outlet is connected to the upper static pressure cavity 11. The precooling heat exchange device for the evaporative condenser also includes a fan 5, which is arranged at the air outlet. The air in the box 1 is discharged outward from the air outlet under the negative pressure of the fan 5 at the top, and the air flow speed is further increased through the fan 5, thereby further enhancing the heat exchange effect.

[0041] An air inlet is provided on the side of the box body 1, and the air inlet is communicated with the lower cavity 12. The precooling heat exchange device for the evaporative condenser also includes an air inlet grille 6, which is arranged at the air inlet.

[0042] Among them, the design of the V-shaped heat exchanger 3 makes the ventilation cross-sectional area there larger than the ventilation cross-sectional area of ​​the water baffle 2, so that the upper space of the upper box body 1 forms an upper static pressure cavity 11. When the water droplets not blocked by the water baffle 2 pass through, the potential energy becomes larger and the kinetic energy becomes smaller, and then the speed becomes slower, so as to achieve secondary separation of water vapor, which can reduce the drift and water mist of cooling water. The main source of noise of convective heat exchange equipment is wind speed. The higher the wind speed, the greater the noise. The air flow speed sucked by the air inlet grille 6 is about 3m / s. After entering the box body 1, the air flow speed is accelerated due to the sudden narrowing of the channel area, which can reach about 4m / s. After the rising air flow enters the upper static pressure cavity 11, the speed can be reduced to 2-2.5m / s, thereby realizing that the noise inside the pre-cooling heat exchange device for the evaporative condenser is very low. The wind resistance in the box body 1 is relatively small and there is enough space to install the fan 5. A 4-6 level low speed fan 5 can be used to achieve a device noise of less than 75dB.

[0043] In hot and humid working conditions in summer, the V-type heat exchanger 3 can pre-cool the high-temperature and high-pressure refrigerant gas. The water vapor through the water baffle 2 exchanges heat with the high-temperature and high-pressure refrigerant gas on the surface of the heat exchanger, and the refrigerant releases heat to become a saturated gas-liquid two-phase body and flows into the main heat exchanger 4 in the lower cavity 12. After the water vapor absorbs heat, the relative humidity is further reduced. When the relative humidity is lower than the ambient temperature, fog-free discharge can be achieved, which can reduce the spread of Legionella. Moreover, the design temperature of this condenser is 35°C, which is lower than the cooling water temperature of 37-41°C for the growth of Legionella, and Legionella will not grow during operation. When operating dry in winter, the heat exchange area is increased due to the presence of the V-type heat exchanger 3, which makes up for the defect of insufficient heating capacity.

[0044] After a general evaporative condenser has been used for a long time, the scale of the sprayed part of the heat exchanger will be serious. The scaling time of the heat exchanger and the looseness of the scale mainly depend on the temperature of the cooled medium in the heat exchanger. The lower the temperature, the slower the scaling time and the lighter the scaling and looseness of the scale. In this embodiment, the cooling medium for heat exchange through the V-shaped heat exchanger 3 is water vapor. Since water vapor is cleaner, the scaling is lighter. Due to the existence of the V-shaped heat exchanger 3, the design condensation temperature of the main heat exchanger 4 is 35°C, that is, the evaporation temperature of the cooling water on the surface of the main heat exchanger 4 is 35°C, which can delay the scaling time.

[0045] In this embodiment, the air outlet is located in the middle area of ​​the top of the box body 1, and the bottom of the V-shaped heat exchanger 3 is arranged symmetrically in a V shape and faces away from the air outlet. Preferably, the V-shaped heat exchanger 3 is a fin tube precooling heat exchanger.

[0046] The precooling heat exchange device for the evaporative condenser also includes a circulation pipeline 7 and a spray device 8. The bottom of the lower cavity 12 has a water collection area 15. The spray device 8 is located above the main heat exchanger 4. One end of the circulation pipeline 7 is connected to the box body 1 and communicates with the water collection area 15. The other end of the circulation pipeline 7 is connected to the spray device 8, so that circulating cooling water is formed between the spray device 8, the water collection area 15, and the circulation pipeline 7. The cooling water in the box body 1 will be concentrated in the water collection area 15, and circulating cooling water will be formed between the spray device 8, the water collection area 15, and the circulation pipeline 7, so that the cooling water in the water collection area 15 will be sprayed toward the main heat exchanger 4 through the circulation pipeline 7 and the spray device 8, thereby improving the heat exchange effect with the main heat exchanger 4.

[0047] The circulation pipeline 7 is provided with a water pump 71. The water is sent to the spray device 8 through the water pump 71, and the nozzle of the spray device 8 evenly sprays the cooling water onto the outer surface of the heat exchange coil of the main heat exchanger 4. The water film that has not evaporated will fall into the box 1 for the next reuse.

[0048] The precooling heat exchange device for the evaporative condenser also includes a water supply pipe 9, which is connected to the housing 1 and communicates with the water collection area 15. Due to evaporation, the cooling water in the housing 1 is continuously reduced during use, and the concentration of salt ions in the cooling water increases accordingly, and the reduced water is supplemented through the water supply pipe 9.

[0049] The precooling heat exchange device for the evaporative condenser also includes a float valve 10, which is located in the housing 1, and one end of the float valve 10 is arranged in the water collection area 15, and the other end of the float valve 10 is connected to the water supply pipe 9 and is used to control the opening and closing of the water supply pipe 9. The opening and closing of the water supply pipe 9 is controlled by the float valve 10, so as to replenish the water in the housing 1, realize automatic operation control, and be more convenient to use, and have high safety and stability.

[0050] In this embodiment, compared with the water-cooled type, the evaporative cooling tower and water collection tank and other equipment are integrated with the condenser. The structure is more compact, and the modular installation makes it more convenient to use and arrange, the floor space is relatively small, the distance of water circulation is reduced, and the power consumption and operating cost of the water pump 71 are relatively low. The power consumption of the water pump 71 is equivalent to 1 / 8 to 1 / 4 of the water-cooled pump consumption. The amount of cooling water replenishment is relatively small, which is much less than the cooling water consumption of the water-cooled type. The circulating water volume is about one-fifth of the water-cooled type, and its one-time water consumption is about 5% to 10% compared with the water-cooled type.

[0051] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A precooling heat exchange device for an evaporative condenser, characterized in that: It includes a box body, a V-shaped heat exchanger, a water baffle and a main heat exchanger. The water baffle is arranged in the box body and divides the internal space of the box body into an upper static pressure cavity and a lower cavity. The upper static pressure cavity is located above the lower cavity. The V-shaped heat exchanger is arranged in the upper static pressure cavity, and the main heat exchanger is arranged in the lower cavity. A steam inlet and a liquid outlet are opened on the outer surface of the box body. One end of the V-shaped heat exchanger is connected to the steam inlet, one end of the main heat exchanger is connected to the liquid outlet, and the other end of the main heat exchanger is connected in series with the other end of the V-shaped heat exchanger.

2. The precooling heat exchange device for an evaporative condenser according to claim 1, characterized in that: An air outlet is provided on the top of the box body, and the air outlet is communicated with the upper static pressure cavity. The precooling heat exchange device for the evaporative condenser also includes a fan, and the fan is arranged at the air outlet.

3. The precooling heat exchange device for an evaporative condenser according to claim 2, characterized in that: The bottom of the V-shaped heat exchanger is arranged symmetrically in a V shape and faces away from the air outlet.

4. The precooling heat exchange device for an evaporative condenser according to claim 1, characterized in that: The V-shaped heat exchanger is a fin tube precooling heat exchanger.

5. The precooling heat exchange device for an evaporative condenser according to claim 1, characterized in that: An air inlet is provided on the side of the box body, and the air inlet is communicated with the lower cavity. The precooling heat exchange device for the evaporative condenser also includes an air inlet grille, and the air inlet grille is arranged at the air inlet.

6. The precooling heat exchange device for an evaporative condenser according to claim 1, characterized in that: The pre-cooling heat exchange device for the evaporative condenser also includes a circulation pipeline and a spray device. The bottom of the lower cavity has a water collection area. The spray device is located above the main heat exchanger. One end of the circulation pipeline is connected to the box and communicates with the water collection area. The other end of the circulation pipeline is connected to the spray device to form circulating cooling water between the spray device, the water collection area and the circulation pipeline.

7. The precooling heat exchange device for an evaporative condenser according to claim 6, characterized in that: The circulation pipeline is provided with a water pump.

8. The precooling heat exchange device for an evaporative condenser according to claim 6, characterized in that: The precooling heat exchange device for the evaporative condenser also includes a water supply pipe, which is connected to the box body and communicated with the water collection area.

9. The precooling heat exchange device for an evaporative condenser according to claim 8, characterized in that: The precooling heat exchange device for the evaporative condenser also includes a float valve, which is located in the box, and one end of the float valve is arranged in the water collection area, and the other end of the float valve is connected to the water supply pipe and is used to control the opening and closing of the water supply pipe.

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