CN117906406A - Cooling water regeneration tower - Google Patents

Abstract

The invention discloses a cooling water regeneration tower, which comprises a tower body, wherein a cooling area, a heat transfer area, a spraying area and an air cooling area are distributed in the tower body from bottom to top; wherein a separation plate is arranged between the cooling zone and the heat transfer zone; a group of cooling flow channels are distributed in the cooling area, and a liquid inlet and a liquid outlet are arranged on the side part of the cooling area; a heat pipe is arranged in the heat transfer area, the heat pipe penetrates through the partition plate, the evaporation section of the heat pipe is at least partially positioned in the cooling flow channels, and one heat pipe is arranged in each cooling flow channel; a group of spray heads are arranged in the spray area, and the spray heads are connected with the spray circulating pump through pipelines and positioned at the top ends of the heat pipes; the spray water flows out from the spray header and is sprayed to the top end of the heat pipe, and vaporization occurs when the spray water contacts the heat pipe; the air cooling area is arranged above the spraying area in the middle and at least comprises a fan; and starting the fan to drive the cooling operation in the tower body. The refrigerant medium in the heat pipe is utilized to generate phase change, heat transfer and heat absorption and release treatment are realized in the phase change process, and the heat transfer efficiency is improved.

Description

Cooling water regeneration tower

Technical Field

The invention belongs to the technical field of cooling towers, and particularly relates to a cooling water regeneration tower.

Background

A cooling tower is a structure for cooling water having a certain temperature. It is common in plants, chemical plants, cement plants, etc. that require a large amount of water temperature control. The height of the cooling tower is a structure which saves water and circulates water according to heat exchange quantity calculation. The cooling tower works on the principle that the air blown in and water sprayed from top to bottom form convection to drain away the heat source, and part of water evaporates in the convection to take away the corresponding evaporation latent heat, so that the temperature of the water is reduced.

The existing cooling towers can be divided into an open cooling tower and a closed cooling tower. The open cooling tower can be referred to as patent CN219934702U, and the patent name is an open cooling tower; or patent CN216558390U, entitled "open cooling tower". The working principle of the concrete open cooling tower is that circulating water is sprayed onto the filler of the glass fiber in a spraying mode, heat exchange is achieved through contact of the water and air, and then a fan drives airflow in the tower to circulate, so that hot airflow after heat exchange with the water is brought out, and the cooling effect is achieved. It follows that the start-up cooling tower has the following disadvantages: 1. because the open cooling tower directly sprays cooling water on the filler, and the filler is directly exposed in the air for a long time, a lot of pollutants such as dust in the air are polluted, and pollutants on the surface of the filler are mixed when the cooling water contacts the filler, so that the quality of the cooling water is deteriorated. 2. The cooling water can grow microorganisms or bacteria due to contact with air after being sprayed on the filler, and because the filler has poor heat conductivity, huge surface area is needed to achieve the required heat transfer effect, and the breeding amount of bacteria or microorganisms is in direct proportion to the surface area contacted with air, so that the open cooling tower can generate more pollutants to be deposited in the tower body, and the later period is needed to be regularly overhauled and maintained and cleaned in time, so that the operation and maintenance cost is higher. 3. Since the cooling water is sprayed after the filler and is brought out by the fan, a certain chemical substance may exist in a part of the cooling water, and once the chemical substance is directly brought out by the fan and discharged into the atmosphere in the spraying process, the environment is polluted, and the discharge is also not compliant. 4. Because the open cooling tower directly sprays cooling water on the filler, if the heat transfer efficiency is to be enhanced, the contact area between the cooling water and the filler needs to be increased, so that the diameter of the open cooling tower is generally larger, and the volume of the open cooling tower is further larger, so that a certain occupied area is needed when the open cooling tower is applied.

The structure of the closed cooling tower can refer to a special CN205878939U in the prior art, the patent name is a heat pipe negative pressure cooling tower, or a patent CN219178332U, and the patent name is a coil pipe drawing type closed cooling tower. The closed cooling tower is physically cooled through the inner circulation pipe, the outer circulation pipe and the coil pipe of the core component, and particularly, the inner circulation pipe is connected with the object equipment (equipment to be cooled) to form a closed circulation system, the circulation medium of the closed circulation system is soft water, the object equipment is cooled, and heat in the object equipment is brought into the cooling tower for cooling treatment. The external circulation is arranged in the cooling tower, so that the cooling tower is cooled, the cooling tower is not contacted with the internal circulation water, and the heat exchange and heat dissipation treatment is only carried out through the coil pipes in the cooling tower. The method mainly comprises the following working processes: cooling water in the external circulation enters the coil pipe, heat of the cooling water is transferred to the outer wall of the coil pipe through the coil pipe, then a spraying system arranged in the cooling tower starts to work, spraying water onto the filler, spraying the water onto the outer wall of the coil pipe after gasifying and cooling the surface of the filler, and carrying out heat transfer treatment on water drops on the outer wall of the coil pipe and the inner part of the coil pipe; simultaneously, the fan starts to work, and heat exchange cooling is carried out in the cooling tower. It can thus be seen that closed cooling towers have the following disadvantages: 1. the cooling treatment of the closed cooling tower is carried out by physical heat transfer by the coil pipe and the material thereof, so that the heat transfer efficiency is low; the heat dissipation and cooling effect values of the coil depend on the heat transfer efficiency of the coil, so the heat transfer efficiency of the coil can have a certain influence on the heat dissipation and cooling effects of the coil by adopting different metals, the coil is generally manufactured by copper materials at present, but the surface area of a copper optical disk tube is limited, so that the heat transfer efficiency of the optical coil is far lower than the heat dissipation effect of a finned tube with larger outer surface area, but fins cannot be added on the outer surface of the heat exchange coil of the closed cooling tower, and even if the fins are added, the heat transfer efficiency of the heat exchange coil is not increased due to the fact that the inner surface of the coil is still a light tube, so the heat transfer efficiency of the closed cooling tower is poor. 2. The heat transfer power of the closed cooling tower is proportional to the contact area of the coil and the cooling water, i.e. when the contact area of the coil and the cooling water increases, the heat transfer power thereof will also increase. The method of increasing the heat transfer power is to increase the surface area of the coil, which requires a reduction in the cross-sectional area of each single tube in the tube bundle for the same heat transfer power and cooling water flow. And the reduction of the section of the single tube can bring adverse factors such as processing difficulty, increase of internal resistance of the pipeline, increase of materials and the like. The increase in internal resistance of the pipeline requires a circulating pump with higher power, so that the cost of the circulating pump is also increased, and the equipment cost and the material cost of the circulating pump and the coil pipe required for cooling water in the closed cooling tower are higher. 3. Because the closed cooling tower needs to circulate inside and outside, two circulating water pumps are needed, the water quantity of the circulating water pump used by the external spraying system is more than or equal to the water quantity of the circulating water pump used by the cooling water, and only then the spraying system can completely take away the heat in the cooling water. The volume required for the spray system is also relatively increased due to the large power and volume of the circulation pump required for cooling water, so that the overall volume of the closed cooling tower is relatively large, although smaller than that of the open cooling tower.

In order to solve the problems, designing a cooling water regeneration tower is an important technical problem to be solved by the person skilled in the art at present.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a cooling water regeneration tower.

The aim of the invention is achieved by the following technical scheme:

The cooling water regeneration tower comprises a tower body, wherein a cooling area, a heat transfer area, a spraying area and an air cooling area are distributed in the tower body from bottom to top; wherein a separation plate is arranged between the cooling zone and the heat transfer zone; a group of cooling flow channels are distributed in the cooling area, and a liquid inlet and a liquid outlet are arranged on the side part of the cooling area; a heat pipe is arranged in the heat transfer area, the heat pipe penetrates through the partition plate, an evaporation section of the heat pipe is at least partially positioned in the cooling flow channels, and one heat pipe is arranged in each cooling flow channel; cooling water with a certain temperature sequentially enters the cooling flow channel from the liquid inlet and contacts with the bottom end of the heat pipe, and the refrigerant in the heat pipe changes phase and transfers heat upwards to the top of the heat pipe; a group of spray heads are arranged in the spray area, and the spray heads are connected with a spray circulating pump through pipelines and positioned at the top ends of the heat pipes; the spray water flows out from the spray header and is sprayed to the top end of the heat pipe, and vaporization occurs when the spray water contacts the heat pipe, so that heat on the heat pipe is absorbed, and heat transfer and cooling are realized; the air cooling area is arranged above the spraying area in the middle and at least comprises a fan; starting the fan to drive the tower body to perform heat dissipation and cooling operation, so that hot air in the heat transfer pipe is liquefied and transferred out of the surface of the heat transfer pipe to realize heat release, and part of heat in the heat transfer area is brought out to realize cooling; and cooling water subjected to cooling treatment flows to the liquid outlet and is discharged, and the cooling water is conveyed to equipment to be used through a pipeline for recycling.

Preferably, a group of cooling flow channels are distributed in the cooling area in a shape like a Chinese character 'hui'; the liquid inlet is positioned on the side wall of the cooling flow channel at the innermost side or the outermost side; the liquid outlet is positioned on the side wall of the cooling flow channel at the outermost side or the innermost side.

Preferably, the partition plate is provided with at least one through hole for setting a breather valve, the breather valve is automatically controlled, and after the breather valve is opened, the pressure in the cooling area is consistent with the pressure in the heat transfer area, so that the free flow of cooling water in the cooling flow channel is facilitated.

Preferably, a spray pump installation area for placing the spray circulating pump is arranged in the middle of the cooling area; the spray pump installation area is arranged in an isolated mode with the innermost cooling flow channel, and a water supplementing port and a liquid level sensor are arranged on the side wall of the spray pump installation area.

Preferably, the condensing section of the heat pipe is located in the heat transfer area, and a set of radiating fins are arranged on the outer wall of the condensing section.

Preferably, the side wall of the tower body is provided with louvers, the opening angle and the closing of the louvers are controlled by a control system, and air enters the tower body through gaps among the louvers to cool the heat transfer area.

The technical scheme of the invention has the advantages that:

The heat transfer efficiency is high, the refrigerant medium in the heat pipe is utilized to generate phase change, heat transfer and heat absorption and release treatment are realized in the phase change process, and the heat transfer efficiency is much higher than that of liquid; because the spray water conveyed to the spray header by the spray circulating pump is vaporized and forms steam when contacting the heat pipe, part of heat on the heat pipe can be taken away, and the heat transfer efficiency of the steam is 1300 times higher than that of the liquid, so that the heat transfer efficiency is higher;

compared with an open cooling tower, the application does not need to arrange heat transfer area amplifying equipment, has lower cost and smaller volume, and has lower requirement on occupied area;

The cooling water naturally flows in the cooling flow channel, is not in direct contact with the atmospheric environment, reduces the loss of the cooling water, and does not pollute the environment;

The cooling water is not polluted, and through holes for preventing the breather valve are formed in the partition plate between the cooling area and the heat transfer area, so that impurities in the tower body are not easy to fall into the cooling area in the use process of the equipment, the cooling water in the tower body is not polluted by the outside to a certain extent, and the cooling water is recycled;

The spray circulation pump is small in volume, and because spray water conveyed to the spray header by the spray circulation pump is vaporized and forms steam when contacting the heat pipe, and the heat carried by the steam is far greater than liquid with the same mass, the water supply capacity and the power of the spray circulation pump can be smaller than those of the spray circulation pump used in the existing closed cooling tower, so that the occupied area of the whole equipment is smaller, and the spray circulation pump has universality;

The tower body is not required to be cleaned, and the later cleaning cost is reduced; coil pipes are not needed, so that materials and cost are saved; in the application, if the heat transfer power of the tower body is to be improved, the diameter of the heat pipe can be increased, namely, when the diameter of the heat pipe is doubled, the external surface material of the heat pipe is doubled, the cross section area of the heat pipe is doubled, meanwhile, the heat transfer power is doubled, the material cost is in direct proportion to the pipe diameter, so that the heat transfer efficiency of the heat pipe is higher than that of a closed cooling tower under the same heat transfer power condition, and the material is saved.

Drawings

Fig. 1: a schematic structural diagram of a preferred embodiment of the present invention;

Fig. 2: an end view of a preferred embodiment of the present invention.

Detailed Description

The objects, advantages and features of the present invention are illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are only typical examples of the technical scheme of the invention, and all technical schemes formed by adopting equivalent substitution or equivalent transformation fall within the scope of the invention.

In the description of the embodiments, it should be noted that the positional or positional relationship indicated by the terms such as "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in the specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the scheme, the direction approaching the operator is the near end, and the direction separating from the operator is the far end, with reference to the operator.

As shown in fig. 1 to 2, the invention discloses a cooling water regeneration tower, which comprises a tower body 1, wherein a cooling area 2, a heat transfer area 3, a spraying area 4 and an air cooling area 5 are distributed in the tower body 1 from bottom to top. A group of cooling flow channels 21 are distributed in the cooling zone 2, and a liquid inlet 211 and a liquid outlet 212 are arranged on the side part of the cooling zone 2. Specifically, a group of cooling flow channels 21 are distributed in the cooling area 2 in a shape like a Chinese character 'hui'; i.e. a spacer 211 is provided between two adjacent cooling channels 21. The height of the further partition plate 211 is preferably lower than the height of the cooling zone 21 and higher than half the height of the cooling zone 21 so that each of the cooling flow passages 21 is non-closed so that cooling water flows in sequence in the cooling flow passages 21. The liquid inlet 211 is positioned on the side wall of the cooling flow channel 21 at the innermost side or the outermost side; the liquid outlet 212 is located on the side wall of the cooling flow channel 21 at the outermost or innermost side so that the cooling water can contact with most of the area of the cooling zone 2.

In the prior patent CN208635596U, an inner cavity for placing a heat pipe is a cavity in the patent name of a heat pipe type cooler and a water-saving fog-dissipating cooling tower, circulating cooling water with a certain temperature is injected into the inner cavity, and heat transfer is realized through the heat pipe. Therefore, the technical scheme completely depends on heat transfer of the heat pipe to cooling water to realize cooling; with the continuous increase of cooling water entering the inner cavity, the heat transfer efficiency of the heat pipe is not increased, so the heat transfer efficiency of the technical scheme is poor. In the application, the cooling water with a certain temperature enters each layer of cooling flow channels 21 in sequence after entering the cooling area 2 and contacts with the heat pipes in each flow channel, so that the cooling water can be gradually cooled in the process of flowing through each layer of cooling flow channels, and meanwhile, the heat pipes are used for heat transfer and cooling treatment after contacting with the heat pipes, thereby accelerating the heat transfer efficiency.

As shown in fig. 1, a heat pipe 31 is disposed in the heat transfer area 3, and the heat pipe 31 includes an evaporation section 311 disposed in the cooling flow path 21, a condensation section 312 disposed in the heat transfer area 3, and a set of heat dissipation fins 313 disposed on an outer wall of the condensation section 312. The heat pipe 31 has the heat radiating fins formed on the outer periphery thereof to increase the contact area and thereby improve the heat transfer efficiency.

Specifically, the heat pipe 31 penetrates through the partition plate 203, and the evaporation section 311 thereof is at least partially located in the cooling flow channel 21 and contacts with the cooling water in the cooling flow channel 21. Further, one heat pipe 31 is disposed in each cooling flow passage 21; i.e., two adjacent heat pipes 31 are spaced apart from each other by the side wall of the cooling flow path 21. Therefore, when the cooling water with a certain temperature sequentially enters the cooling flow channel 21 from the liquid inlet 211 and contacts the bottom end of the heat pipe 31, the bottom of the heat pipe 31 is heated, and the heated heat is transferred to the top of the heat pipe 31, and the refrigerant in the heat pipe 31 is subjected to phase change. Specifically, the refrigerant medium absorbs heat from a liquid or solid state to become evaporated gas after being heated, and the temperature of the refrigerant is lower than that of the cooling water, so that the refrigerant medium can absorb heat of the cooling water; the evaporated refrigerant enters the top of the heat pipe in a gas form, heat is transferred to the outside of the heat pipe, and the heat is condensed and flows back to the bottom of the heat pipe after the temperature is reduced.

Further, a partition plate 203 is arranged between the cooling zone 2 and the heat transfer zone 3; the two regions are relatively isolated. In addition, in the present application, at least one through hole 2030 for providing a breather valve is preferably provided on the partition plate 203, and the breather valve is automatically controlled by an electric circuit, and when opened, makes the air pressure in the cooling zone 2 and the air pressure in the heat transfer zone 3 consistent, so that the cooling water can flow freely in the cooling flow channel 21. Because the hole diameter of the through hole 2030 is smaller, impurities in the tower body are not easy to fall into the cooling area 2 in the use process, so that cooling water in the tower body cannot be polluted by the outside to a certain extent, and meanwhile, the cooling water is recycled.

The spraying area 4 is arranged above the heat transfer area 3, and a group of spraying heads 41 positioned at the top ends of the heat pipes 31 are arranged in the spraying area 4. The spray header 41 is connected with the spray circulating pump 40; further, a spray pump installation area 24 for placing the spray circulating pump 40 is centrally arranged in the cooling area 2; the spray pump installation area 24 is isolated from the innermost cooling flow channel 21, and a water supplementing port 241 and a liquid level sensor are arranged on the side wall of the spray pump installation area 24. Therefore, the spray circulation pump 40 pumps spray water from the spray pump installation area 24 and delivers the spray water to the spray header 41 for spraying, and when the liquid level sensor on the spray pump installation area 24 detects that the water yield in the area is insufficient, the spray water is supplemented into the spray pump installation area 24 by opening the water supplementing port 241, so that the spray header can continuously and effectively deliver the spray water to realize the cooling of the heat transfer area.

Further, the spray water flows out from the spray header 41 and is sprayed to the top end of the heat pipe 31, and is vaporized when contacting with the heat pipe 31, so as to absorb heat on the heat pipe 31, thereby realizing heat transfer and cooling. Specifically, the heat transfer efficiency realized in the cyclic phase change process of the refrigerant medium in the heat pipe is far higher than that of the coil pipe of the existing closed cooling tower.

In addition, in the present application, the spray water delivered from the spray circulation pump 40 to the spray header 41 is vaporized when contacting the top of the heat pipe 31, so that part of heat on the heat pipe 31 can be taken away, and heat exchange generated by vaporization is 1300 times higher than that of liquid heat transfer, so that heat transfer efficiency is higher; the cooling water quantity required by vaporization is correspondingly smaller than the heat transfer of liquid, so that the water supply quantity and the power of the spray circulation pump 40 can be smaller than those of the spray circulation pump used in the existing closed cooling tower, and the occupied area of the whole equipment is smaller, so that the spray circulation pump has universality; meanwhile, compared with the existing closed cooling tower, the spraying circulation pump 40 can save more than 95% of spraying capacity, and greatly saves the equipment cost of the spraying circulation pump and the water pipe in the spraying system; and the electric energy is also greatly saved during operation.

In the prior closed cooling tower, the surface area of the coil pipe is increased by comparably and linearly in order to improve the heat transfer power. Resulting in a linear increase in material costs. In the application, if the heat transfer power of the tower body is to be improved, the diameter of the heat pipe can be increased, in particular, when the diameter of the heat pipe is doubled, the external surface material of the heat pipe is doubled, and the cross section area of the heat pipe is increased by square times of the radius, namely, the cross section area is square ratio to the radius of the heat pipe.

The air cooling zone 5 is centrally arranged above the spraying zone 4 and at least comprises a fan 51. The fan 51 is started to drive the heat dissipation and cooling operation to the inside of the tower body 1, so that the evaporated gas in the heat transfer area 3 is liquefied and adsorbed on the heat pipe 31, thereby realizing heat dissipation. And meanwhile, part of heat in the heat transfer area 3 is taken out through the fan 51, so that cooling is realized. Therefore, a part of spray water sprayed onto the heat pipe 31 is discharged from the tower body 1 by the fan 51, and a part of other spray water remained in the tower body 1 is liquefied after the fan 51 is started to form water drops to drop onto the heat pipe 31, and meanwhile, heat on the heat pipe 31 is absorbed, so that heat transfer is realized, and the temperature of the heat pipe is further reduced until the temperature of cooling water contacting with the bottom of the heat pipe is reduced to a required temperature. Finally, the cooling water after the cooling treatment flows to the liquid outlet 212 to be discharged, and is conveyed to the equipment to be used through a pipeline to be recycled.

Further, the side wall of the tower body 1 is provided with louvers 52, the opening angle and closing of the louvers 52 are controlled by a control system, and air enters the tower body 1 through gaps among the louvers to cool the heat transfer area 3.

The invention has various embodiments, and all technical schemes formed by equivalent transformation or equivalent transformation fall within the protection scope of the invention.

Claims (6)

1. The cooling water regeneration tower is characterized in that: the cooling tower comprises a tower body (1), wherein a cooling area (2), a heat transfer area (3), a spraying area (4) and an air cooling area (5) are distributed in the tower body (1) from bottom to top; wherein a separation plate (203) is arranged between the cooling zone (2) and the heat transfer zone (3); a group of cooling flow channels (21) are distributed in the cooling zone (2), and a liquid inlet (211) and a liquid outlet (212) are formed in the side part of the cooling zone (2); a heat pipe (31) is arranged in the heat transfer area (3), the heat pipe (31) penetrates through the partition plate (203), an evaporation section (311) of the heat pipe is at least partially positioned in the cooling flow channels (21), and one heat pipe (31) is arranged in each cooling flow channel (21); cooling water with a certain temperature sequentially enters the cooling flow channel (21) from the liquid inlet (211) and contacts with the bottom end of the heat pipe (31), and the refrigerant in the heat pipe (31) changes phase and transfers heat upwards to the top of the heat pipe (31); a group of spray heads (41) are arranged in the spray zone (4), and the spray heads (41) are connected with a spray circulating pump (40) through pipelines and are positioned at the top ends of the heat pipes (31); the spray water flows out from the spray header (41) and is sprayed to the top end of the heat pipe (31), and is vaporized when contacting with the heat pipe (31) so as to absorb heat on the heat pipe (31) and realize heat transfer and cooling; the air cooling area (5) is arranged above the spraying area (4) in the middle and at least comprises a fan (51); the fan (51) is started to drive the tower body (1) to perform heat dissipation and cooling operation, and part of heat in the heat transfer area (3) is taken out to realize cooling; the cooling water after the cooling treatment flows to the liquid outlet (212) to be discharged, and is conveyed to equipment to be used through a pipeline to be recycled.

2. The cooling water regeneration tower according to claim 1, wherein: the group of cooling flow channels (21) are distributed in the cooling area (2) in a shape like a Chinese character 'hui'; the liquid inlet (211) is positioned on the side wall of the cooling flow channel (21) at the innermost side or the outermost side; the liquid outlet (212) is positioned on the side wall of the cooling flow channel (21) at the outermost side or the innermost side.

3. The cooling water regeneration tower according to claim 1, wherein: the partition plate (203) is provided with at least one through hole (2030) for setting a breather valve, the breather valve is automatically controlled, and after the breather valve is opened, the air pressure in the cooling area (2) is consistent with the air pressure in the heat transfer area (3), so that the cooling water can flow freely in the cooling flow channel (21).

4. The cooling water regeneration tower according to claim 1, wherein: a spray pump installation area (24) for placing the spray circulating pump (40) is arranged in the middle of the cooling area (2); the spray pump installation area (24) and the innermost cooling flow channel (21) are arranged in an isolated mode, and a water supplementing port (241) and a liquid level sensor are arranged on the side wall of the spray pump installation area (24).

5. The cooling water regeneration tower according to claim 4, wherein: the condensing section (312) of the heat pipe (31) and the evaporating section (311) are integrally arranged, the condensing section (312) is positioned in the heat transfer area (3), and a group of radiating fins (313) are arranged on the outer wall of the condensing section (312).

6. The cooling water regeneration tower according to claim 5, wherein: the side wall of the tower body (1) is provided with the louvers (52), the opening angle and the closing of the louvers (52) are controlled by the control system, and air enters the tower body (1) through gaps among the louvers to cool the heat transfer area (3).