Multi-stage cooling system

Abstract

A multi-stage cooling system comprises a first-stage cooling tower and a second-stage cooling tower, the top of the first-stage cooling tower and the top of the second-stage cooling tower are each provided with a draught fan and a water blocking device located below the draught fan, the upper portion of the first-stage cooling tower and the upper portion of the second-stage cooling tower are further provided with a cooling water inlet pipe and a spraying water pipe connected with the cooling water inlet pipe, and a heat exchange coil pipe set is arranged below the spraying water pipe. The heat exchange coil pipe group comprises a plurality of groups of heat exchange pipes which are arranged from top to bottom, and each group of heat exchange pipes consists of an upper heat exchange coil pipe and a lower heat exchange coil pipe which are arranged in a staggered manner. The pipe body of the heat exchange coil pipe is provided with the functional coating, so that the mechanical property and the heat-conducting property of the metal-based composite material are effectively improved, and the heat exchange coil pipe has higher strength and heat conductivity.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling and heat exchange, in particular to a multi-stage cooling system. Background Art

[0002] In the pharmaceutical industry, cooling water is often required for temperature control of powder production, but conventional single cooling towers cannot cool the cooling water down enough, and it is difficult to obtain cooling return water with low temperature and good consistency. It is difficult for a single cooling tower to quickly cool high-temperature cooling return water to room temperature, especially for return water with a temperature above 60 degrees. In addition, cooling towers usually require the use of heat exchange pipes. The current heat exchange pipes are in frequent contact with water during use, and the outer and inner walls are severely worn during use. The heat exchange pipes are not easy to replace during use, and a large amount of manpower and material resources are required for maintenance. In view of the problems exposed during the use of the current heat exchange pipes, it is also necessary to improve and optimize the structure of the heat exchange pipes. Utility Model Content

[0003] The purpose of the present invention is to provide a multi-stage cooling system to solve the above-mentioned deficiencies.

[0004] The utility model comprises a primary cooling tower and a secondary cooling tower. The tops of the primary cooling tower and the secondary cooling tower are both provided with fans and water retainers located below them. The upper parts of the primary cooling tower and the secondary cooling tower are also provided with cooling water inlet pipes and spray water pipes connected thereto. A heat exchange coil group is provided below the spray water pipes.

[0005] The heat exchange coil group includes multiple groups of heat exchange tubes arranged from top to bottom, each group of heat exchange tubes consists of an upper heat exchange coil and a lower heat exchange coil arranged in a mutually staggered manner, the middle of the upper heat exchange coil is provided with a vertical tube a connected to the middle of the lower heat exchange coil, and the tail end of the lower heat exchange coil is provided with a vertical tube b connected to another upper heat exchange coil below it; the upper heat exchange coil of the uppermost group of heat exchange tubes is connected to the hot water inlet pipe, and the lower heat exchange coil of the lowermost group of heat exchange tubes is connected to the hot water outlet pipe; an air inlet grille is provided on the tower wall below the heat exchange coil group, a water trough is provided at the bottom of the primary cooling tower and the secondary cooling tower and below the air inlet grille, and a cooling water outlet pipe is provided at the bottom of the water trough;

[0006] The hot water outlet pipe of the primary cooling tower is connected to the hot water inlet pipe of the secondary cooling tower through the delivery pipe a, and the cooling water outlet pipe of the primary cooling tower is connected to the top of the supplementary cooling water tank through the delivery pipe b; a cold water replenishment pipe is provided on the top of the supplementary cooling water tank, and an agitator is also provided in the supplementary cooling water tank, and the bottom outlet pipe of the supplementary cooling water tank is connected to the cooling water inlet pipe of the secondary cooling tower;

[0007] The upper heat exchange coil and the lower heat exchange coil both include a tube body, which is composed of a tube wall, an inner coating of the tube wall, and an outer coating of the tube wall;

[0008] The coating on the inner side of the tube wall is a metal-based graphene composite coating;

[0009] The outer coating of the tube wall comprises a zirconium oxide coating and an aluminum nitride coating which are arranged in sequence, and the zirconium oxide coating is arranged on the outer surface of the tube wall, and the aluminum nitride coating is arranged on the outer surface of the zirconium oxide coating.

[0010] Preferably, a water pump a and a backup water pump b are arranged in parallel on the delivery pipeline a.

[0011] Preferably, a water pump c and a backup water pump d are arranged in parallel on the delivery pipeline b.

[0012] Preferably, the upper heat exchange coil and the lower heat exchange coil are both mosquito coils.

[0013] Preferably, the number of the multiple groups of heat exchange tubes is at least three.

[0014] Preferably, the spray water pipe is provided with a plurality of groups of high-pressure nozzles.

[0015] Preferably, the zirconium oxide coating and the aluminum nitride coating are sprayed onto the outer surface of the tube wall by plasma arc gas to form an outer coating of the tube wall.

[0016] Preferably, the metal-based graphene composite coating is a graphene / Cu coating or a graphene / Al coating.

[0017] Preferably, a plurality of fins are evenly arranged on the outer wall of the tube wall, and the outer surfaces of the plurality of fins are provided with the outer coating of the tube wall.

[0018] The utility model has the advantages of multi-stage cooling, gradually cooling the high-temperature cooling return water, and quickly cooling the high-temperature return water. The cooling efficiency is high and the cooling water temperature consistency is good, which can ensure the accuracy of the reaction temperature when used in the production of powders. The tube body of the heat exchange coil is provided with a functional coating. In the metal-based graphene composite coating, there is a strong interface interaction between the graphene and the metal matrix, which can effectively improve the mechanical properties and thermal conductivity of the metal-based composite material, have higher strength and thermal conductivity, and also improve the wear resistance and corrosion resistance of the material. Zirconia has excellent thermal conductivity and has better high-temperature thermal conductivity than traditional thermal conductive materials. The thermal conductivity of aluminum nitride is very high, about 180-285 W / m·K, which is much higher than traditional heat dissipation materials such as aluminum and copper. This means that it can conduct and disperse heat more effectively, allowing heat to be quickly conducted from the heat source to the external environment. Aluminum nitride has high hardness and mechanical strength, and can maintain stable performance under high temperature and pressure environments. This makes it perform well in high-power and high-temperature applications and can withstand complex working conditions. The aluminum nitride coating also makes the pipe body more wear-resistant and durable during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 Schematic diagram of the connection between the upper heat exchange coil and the lower heat exchange coil.

[0021] Figure 3 Schematic diagram of the structure of the tube body.

[0022] Figure 4 Schematic diagram of the internal structure of the tube. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, if the terms "first", "second", etc. appear in the description of the present utility model, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] As shown in the accompanying drawings, the utility model includes a primary cooling tower 1 and a secondary cooling tower 3. The tops of the primary cooling tower 1 and the secondary cooling tower 3 are both provided with a fan 11 and a water retainer 12 located below them. The upper parts of the primary cooling tower 1 and the secondary cooling tower 3 are also provided with a cooling water inlet pipe 14 and a spray water pipe 15 connected thereto. A heat exchange coil group 16 is provided below the spray water pipe 15.

[0028] The heat exchange coil group 16 includes a plurality of groups of heat exchange tubes arranged from top to bottom, each group of heat exchange tubes is composed of an upper heat exchange coil 17 and a lower heat exchange coil 18 which are arranged staggered with each other, a vertical tube a19 connected to the middle of the lower heat exchange coil 18 is provided in the middle of the upper heat exchange coil 17, and a vertical tube b20 connected to another upper heat exchange coil 17 below is provided at the tail end of the lower heat exchange coil 18; the upper heat exchange coil 17 of the uppermost group of heat exchange tubes is connected to a hot water inlet pipe 21, and the lower heat exchange coil 18 of the lowermost group of heat exchange tubes is connected to a hot water outlet pipe 22; an air inlet grille 23 is provided on the tower wall below the heat exchange coil group 16, a water trough 24 is provided at the bottom of the primary cooling tower 1 and the secondary cooling tower 3 and below the air inlet grille 23, and a cooling water outlet pipe 25 is provided at the bottom of the water trough 24;

[0029] The hot water outlet pipe 22 of the primary cooling tower 1 is connected to the hot water inlet pipe 21 of the secondary cooling tower 3 through the delivery pipe a, and the cooling water outlet pipe 25 of the primary cooling tower 1 is connected to the top of the supplementary cooling water tank 2 through the delivery pipe b; a cool water replenishment pipe 26 is provided on the top of the supplementary cooling water tank 2, and an agitator 27 is also provided in the supplementary cooling water tank 2, and the bottom outlet pipe of the supplementary cooling water tank 2 is connected to the cooling water inlet pipe 14 of the secondary cooling tower 3;

[0030] The upper heat exchange coil 17 and the lower heat exchange coil 18 each include a tube body 100, and the tube body 100 is composed of a tube wall 101, a tube wall inner coating, and a tube wall outer coating;

[0031] The coating on the inner side of the tube wall is a metal-based graphene composite coating 102;

[0032] The coating on the outer side of the tube wall includes a zirconium oxide coating 103 and an aluminum nitride coating 104 which are sequentially arranged. The zirconium oxide coating 103 is arranged on the outer surface of the tube wall, and the aluminum nitride coating 104 is arranged on the outer surface of the zirconium oxide coating 103 .

[0033] In another technical solution, a water pump a30 and a backup water pump b31 are arranged in parallel on the delivery pipeline a, so that when a single water pump fails, the use is not affected.

[0034] In another technical solution, a water pump c32 and a backup water pump d33 are arranged in parallel on the delivery pipeline b, so that when a single water pump fails, the use is not affected.

[0035] In another technical solution, the upper heat exchange coil 17 and the lower heat exchange coil 18 are both mosquito coils.

[0036] In another technical solution, the number of the multiple groups of heat exchange tubes is at least three.

[0037] In another technical solution, the spray water pipe 15 is provided with a plurality of groups of high-pressure nozzles.

[0038] In another technical solution, the zirconium oxide coating 103 and the aluminum nitride coating 104 are sprayed onto the outer surface of the tube wall 101 by plasma arc gas to form a coating on the outer side of the tube wall.

[0039] In another technical solution, the tube body 100 is a steel tube or an aluminum tube, which has good thermal conductivity and high heat exchange efficiency.

[0040] In another technical solution, the metal-based graphene composite coating 102 is a graphene / Cu coating or a graphene / Al coating, wherein the mass of the graphene powder accounts for 0.1% to 1.0% of the total weight of the metal powder and the graphene powder. The particle size of the metal powder is 30 to 55 um; and the particle size of the graphene powder is 20 to 50 um.

[0041] In another technical solution, the outer wall of the tube wall 101 is evenly provided with a plurality of fins, and the outer surfaces of the plurality of fins are provided with the outer coating of the tube wall. The fins can further improve the heat exchange efficiency of the heat exchange tube.

[0042] Working principle: high-temperature water enters the interior through the hot water inlet pipe of the primary cooling tower, and then cools the hot water through the spray water pipe and the heat exchange coil. The fan also sucks air from the air inlet grille and then discharges it. The water after primary cooling is connected to the hot water inlet pipe of the secondary cooling tower through the hot water outlet pipe through the conveying pipeline. The cooling water outlet pipe of the primary cooling tower is connected to the supplementary cooling water tank through the conveying pipeline b. The top of the supplementary cooling water tank is added with cold water through the cold water replenishing pipe for cooling. At the same time, it is mixed by the stirrer of the supplementary cooling water tank. The bottom outlet pipe of the supplementary cooling water tank is connected to the cooling water inlet pipe of the secondary cooling tower, and then the water after primary cooling is cooled through the spray water pipe and the heat exchange coil. Finally, the water after cooling again is discharged from the hot water outlet pipe of the secondary cooling tower. In the metal-based graphene composite coating of the heat exchange coil, there is a strong interface interaction between graphene and the metal matrix, which can effectively improve the mechanical properties and thermal conductivity of the metal-based composite material, have higher strength and thermal conductivity, and also improve the wear resistance and corrosion resistance of the material. Zirconia has excellent thermal conductivity and has better high-temperature thermal conductivity than traditional thermal conductive materials. The thermal conductivity of aluminum nitride is very high, about 180-285 W / m·K, which is much higher than traditional heat dissipation materials such as aluminum and copper. This means that it can conduct and disperse heat more effectively, allowing heat to be quickly transferred from the heat source to the external environment. Aluminum nitride has high hardness and mechanical strength and can maintain stable performance under high temperature and pressure environments. This makes it perform well in high-power and high-temperature applications and can withstand complex working conditions. The aluminum nitride coating also makes the tube more wear-resistant and durable during use.

[0043] The above implementation cases are only for illustrating the technical solutions and features of the utility model, and their purpose is to enable people familiar with the technology to implement them better. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model are within the protection scope of the utility model, and those not described in detail are prior art.

Claims

1. A multi-stage cooling system, comprising a primary cooling tower (1) and a secondary cooling tower (3), wherein the top of each of the primary cooling tower (1) and the secondary cooling tower (3) is provided with a fan (11) and a water retainer (12) located below the fan, the upper part of each of the primary cooling tower (1) and the secondary cooling tower (3) is also provided with a cooling water inlet pipe (14) and a spray water pipe (15) connected thereto, and a heat exchange coil group (16) is provided below the spray water pipe (15), characterized in that: The heat exchange coil group (16) comprises a plurality of groups of heat exchange tubes arranged from top to bottom, each group of heat exchange tubes comprises an upper heat exchange coil (17) and a lower heat exchange coil (18) arranged in a staggered manner, the middle of the upper heat exchange coil (17) is provided with a vertical tube a (19) connected to the middle of the lower heat exchange coil (18), and the tail end of the lower heat exchange coil (18) is provided with a vertical tube b (20) connected to another upper heat exchange coil (17) below it; the upper heat exchange coil (17) of the uppermost group of heat exchange tubes is connected to a hot water inlet pipe (21), and the lower heat exchange coil (18) of the lowermost group of heat exchange tubes is connected to a hot water outlet pipe (22); an air inlet grille (23) is provided on the tower wall below the heat exchange coil group (16) A water storage tank (24) is provided at the bottom of the primary cooling tower (1) and the secondary cooling tower (3) and below the air inlet grille (23); a cooling water outlet pipe (25) is provided at the bottom of the water storage tank (24); the hot water outlet pipe (22) of the primary cooling tower (1) is connected to the hot water inlet pipe (21) of the secondary cooling tower (3) through a delivery pipe a; the cooling water outlet pipe (25) of the primary cooling tower (1) is connected to the top of the supplementary cooling water tank (2) through a delivery pipe b; a cooling water replenishment pipe (26) is provided at the top of the supplementary cooling water tank (2); an agitator (27) is also provided in the supplementary cooling water tank (2); the bottom outlet pipe of the supplementary cooling water tank (2) is connected to the cooling water inlet pipe (14) of the secondary cooling tower (3); The upper heat exchange coil (17) and the lower heat exchange coil (18) both comprise a tube body (100), wherein the tube body (100) is composed of a tube wall (101), a tube wall inner coating, and a tube wall outer coating; The coating on the inner side of the tube wall is a metal-based graphene composite coating (102); The coating on the outer side of the tube wall comprises a zirconium oxide coating (103) and an aluminum nitride coating (104) which are arranged in sequence, and the zirconium oxide coating (103) is arranged on the outer surface of the tube wall, and the aluminum nitride coating (104) is arranged on the outer surface of the zirconium oxide coating (103); The metal-based graphene composite coating (102) is a graphene / Cu coating or a graphene / Al coating.

2. A multi-stage cooling system according to claim 1, characterized in that: The delivery pipeline a is provided with a water pump a (30) and a standby water pump b (31) in parallel.

3. A multi-stage cooling system according to claim 1, characterized in that: The delivery pipeline b is provided with a water pump c (32) and a standby water pump d (33) in parallel.

4. A multi-stage cooling system according to claim 1, characterized in that: The upper heat exchange coil (17) and the lower heat exchange coil (18) are both mosquito coil type coils.

5. A multi-stage cooling system according to claim 1, characterized in that: The number of the multiple groups of heat exchange tubes is at least three.

6. A multi-stage cooling system according to claim 1, characterized in that: The spray water pipe (15) is provided with a plurality of groups of high-pressure spray nozzles.

7. A multi-stage cooling system according to claim 1, characterized in that: The zirconium oxide coating (103) and the aluminum nitride coating (104) are sprayed onto the outer surface of the tube wall (101) by plasma arc gas to form a coating on the outer side of the tube wall.

8. A multi-stage cooling system according to claim 1, characterized in that: The outer wall of the tube wall (101) is also evenly provided with a plurality of fins, and the outer surfaces of the plurality of fins are provided with the outer coating of the tube wall.

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