Evaporative pattern casting line waste heat recovery energy-saving structure

Abstract

The utility model relates to the technical field of heat energy reutilization, and discloses a lost foam casting line waste heat recovery energy-saving structure which comprises a plurality of dry sand containers, a drying room, a cold water tower and a forming device. The drying room is used for drying coating for lost foam manufacturing, the forming equipment is used for lost foam forming manufacturing, the multiple heat exchange pipes are installed in the multiple dry sand containers respectively, and the multiple heat exchange pipes are in butt joint with the cold water tower and the stainless steel heat preservation water tank through blending pipelines; according to the drying room, heat generated by a lost foam casting line can be recycled, the recycled heat is stored in the stainless steel heat preservation water tank with water as a medium, the recycled heat can be used for heat exchange in the drying room through the arrangement of the heat exchange mechanism, the effect of drying coating in the drying room is achieved, heat energy is recycled, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat energy reuse, and more specifically to a waste heat recovery and energy-saving structure for an EPC casting line. Background Art

[0002] The EPC casting line is an advanced casting technology. Based on the full-mold casting principle, it manufactures castings through the gasification of the pattern. This technology first uses paraffin or foam patterns similar to the shape of the casting and bonds them into a pattern cluster. During the casting process, the pattern cluster is coated with a refractory coating to enhance its strength and then buried in dry quartz sand for molding by vibration. When the liquid metal is poured into the cavity where the pattern cluster is located, under the action of negative pressure, the pattern gradually gasifies, and the liquid metal fills its position to form a casting. After casting, the temperature of the dry sand rises (the temperature of quartz sand reaches 280 - 300 degrees, and the temperature of perlite sand reaches 300 degrees), and heat exchange and cooling need to be carried out through the pipeline of the cooling tower. After cooling, the dry sand for molding can be used for cyclic casting.

[0003] There is a situation of heat energy waste in the existing EPC casting line. For example, the circulating water used for heat exchange and cooling of dry sand has a temperature as high as 80 - 90 degrees. When manufacturing and forming the EPC pattern, high-temperature steam is required for heating, and the steam discharged after heat exchange still has a temperature of 170 - 180 degrees. These two parts of heat energy are not reasonably utilized, resulting in energy waste. Summary of the Utility Model

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a waste heat recovery and energy-saving structure for an EPC casting line to solve the problem of energy waste caused by the unreasonable utilization of heat energy in the traditional EPC casting line in the above-mentioned background art.

[0005] The utility model provides the following technical solutions: A waste heat recovery and energy-saving structure for an EPC casting line includes several dry sand containers, a drying room, a cooling tower, and a forming device. The dry sand containers are used to fill dry sand and EPC molding molds. The drying room is used to dry the coating for EPC manufacturing. The forming device is used for EPC molding manufacturing. It also includes a stainless steel heat preservation water tank, several heat exchange tubes, and a heat exchange mechanism. Several of the heat exchange tubes are respectively installed in several dry sand containers, and several heat exchange tubes are all connected to the cooling tower and the stainless steel heat preservation water tank through a distribution pipeline. A water delivery mechanism is arranged inside the stainless steel heat preservation water tank. The water delivery mechanism is connected to the cooling tower and the stainless steel heat preservation water tank through the heat exchange mechanism. The heat exchange mechanism is used to exchange heat between the water output by the water delivery mechanism and the inside of the drying room;

[0006] It also includes a hot gas collection device. The intake end of the hot gas collection device is docked with a number of dry sand containers, and the outlet end of the hot gas collection device is docked with a three-way pipeline. The exhaust end of the forming equipment is docked with the three-way pipeline through a second centrifugal fan. The output end of the three-way pipeline is internally connected to a stainless steel heat preservation water tank.

[0007] Furthermore, the heat exchange tubes are serpentine and surround the inner wall of the dry sand container. The dry sand container is connected to the inner wall of the dry sand container through a number of fixing brackets a.

[0008] Furthermore, the dispensing pipeline includes a first water pump, a water inlet pipe, and a water outlet pipe. The water inlet of the first water pump is docked with the output end of the cooling tower. The water drainage end of the first water pump is connected to the water inlet pipe through a third connecting pipe. A number of water inlet branch pipes are communicated with the side wall of the water inlet pipe. A number of the water inlet branch pipes are respectively connected to the water inlet ends of a number of heat exchange tubes. A number of water outlet branch pipes are communicated with the side wall of the water outlet pipe. A number of the water outlet branch pipes are respectively connected to the water outlet ends of a number of heat exchange tubes. One end of the water outlet pipe is internally connected to the stainless steel heat preservation water tank through a fourth connecting pipe.

[0009] Furthermore, the stainless steel heat preservation water tank includes a main container. A sandwich space is provided on the inner wall of the main container. The output end of the three-way pipeline is docked with the interior of the sandwich space. An activated carbon layer is filled in the interior of the sandwich space. An air outlet pipe is installed on the side wall of the stainless steel heat preservation water tank. The air outlet pipe is communicated with the interior of the sandwich space.

[0010] Furthermore, the hot gas collection device includes an intake device, a first centrifugal fan, and an intake pipe. The intake device is fixedly connected to the side walls of a number of dry sand containers. The intake end of the first centrifugal fan is equipped with an intake pipe. The interior of the intake pipe is communicated with the interior of the intake device through a number of connecting air ducts. The exhaust end of the first centrifugal fan is communicated with the port of the three-way pipeline.

[0011] Furthermore, the intake device includes an L-shaped cabin plate. The horizontal plate of the L-shaped cabin plate extends to the top of the dry sand container. A number of air inlets are provided at the bottom of the horizontal plate of the L-shaped cabin plate. The air inlets are communicated with the interior of the L-shaped cabin plate.

[0012] Furthermore, the water delivery mechanism includes a second water pump and a water delivery pipe. The second water pump is installed inside the stainless steel heat preservation water tank. The water outlet end of the second water pump is connected to the heat exchange mechanism through the water delivery pipe.

[0013] Furthermore, the heat exchange mechanism includes a first connecting pipe, a heat exchanger, and a second connecting pipe. The output end of the water delivery mechanism is connected to the water inlet end of the heat exchanger through the first connecting pipe. The heat exchanger is installed inside the drying room. The water outlet end of the heat exchanger is communicated with the second connecting pipe. The other end of the second connecting pipe is connected to a first circulation branch pipe and a second circulation branch pipe through a three-way valve. The first circulation branch pipe is communicated with the interior of the cooling tower. The second circulation branch pipe is communicated with the interior of the stainless steel heat preservation water tank.

[0014] Technical effects and advantages of the present utility model:

[0015] Through the deployment pipeline of the present utility model, the heat dissipated by the cooling of dry sand in the lost foam casting line can be recovered. Through the centrifugal fan II cooperating with the three-way pipeline, the heat of the high-temperature steam discharged during the lost foam molding manufacturing can be recovered. And through the hot gas collection device cooperating with the three-way pipeline, the heat generated during the casting of the dry sand mold cavity can be recovered. The recovered heat is stored inside the stainless steel heat preservation water tank with water as the medium. By setting up a heat exchange mechanism, the recovered heat can be used for heat exchange inside the drying room, achieving the drying effect on the coating inside the drying room and realizing the reuse of heat energy to achieve the energy-saving effect;

[0016] After the water in the heat exchange mechanism participates in the heat exchange inside the drying room, there are two circulation mechanisms. When the heat of the water decreases to a certain temperature after participating in the heat exchange, the water can be input into the cooling tower and participate in the next cycle again for the heat recovery during the dry sand cooling process. If the water in the heat exchange mechanism still has a relatively high heat after participating in the heat exchange, it is input into the stainless steel heat preservation water tank and participates in the heat exchange process with the drying room again in the next cycle, realizing the full utilization of waste heat and further achieving the energy-saving effect. Description of the drawings

[0017] Figure 1 It is the overall plane structure schematic diagram of the present utility model;

[0018] Figure 2 It is the structure schematic diagram of the dry sand container and heat exchange tube of the present utility model;

[0019] Figure 3 For the present utility model Figure 1 The enlarged structure schematic diagram of the heat exchange tube in it;

[0020] Figure 4 For the present utility model Figure 2 The structure schematic diagram of the deployment pipeline in it;

[0021] Figure 5 For the present utility model Figure 2 The sectional structure schematic diagram of the stainless steel heat preservation water tank in it;

[0022] Figure 6 For the present utility model Figure 1 The structure schematic diagram of the hot gas collection device in it.

[0023] The reference numerals are: 1, dry sand container; 2, drying chamber; 3, cooling tower; 4, stainless steel heat preservation water tank; 5, heat exchange tube; 6, dispensing pipeline; 7, hot gas collection device; 8, outlet end pipe; 9, water delivery mechanism; 10, heat exchange mechanism; 11, molding equipment; 12, centrifugal fan II; 13, three-way pipeline; 101, connecting pipe I; 102, heat exchanger; 103, connecting pipe II; 104, three-way valve; 105, circulation branch pipe I; 106, circulation branch pipe II; 61, water pump I; 62, water inlet pipe; 63, water outlet pipe; 64, water outlet branch pipe; 65, connecting pipe III; 66, connecting pipe IV; 67, water inlet branch pipe; 41, main container; 42, interlayer space; 71, air inlet device; 72, centrifugal fan I; 73, air inlet pipe; 74, connecting air duct; 711, L-shaped cabin plate; 712, air inlet; 91, water pump II; 92, water delivery pipe. Detailed implementation manners

[0024] The following will make a detailed description of the specific implementation manners of the present utility model in conjunction with the attached drawings.

[0025] Referring to Figure 1 and Figure 2 , it includes a number of dry sand containers 1, a drying chamber 2, a cooling tower 3, and molding equipment 11. The dry sand container 1 is used to fill dry sand and the lost foam molding mold. The drying chamber 2 is used to dry the coating for lost foam manufacturing. The molding equipment 11 is used for lost foam molding manufacturing. It also includes a stainless steel heat preservation water tank 4, a number of heat exchange tubes 5, and a heat exchange mechanism 10. The number of heat exchange tubes 5 are respectively installed in a number of dry sand containers 1. The number of heat exchange tubes 5 are all connected to the cooling tower 3 and the stainless steel heat preservation water tank 4 through the dispensing pipeline 6. A water delivery mechanism 9 is arranged inside the stainless steel heat preservation water tank 4. The water delivery mechanism 9 is connected to the cooling tower 3 and the stainless steel heat preservation water tank 4 through the heat exchange mechanism 10. The heat exchange mechanism 10 is used to exchange heat between the water output by the water delivery mechanism 9 and the inside of the drying chamber 2;

[0026] It also includes a hot gas collection device 7. The air inlet end of the hot gas collection device 7 is connected to a number of dry sand containers 1. The air outlet end of the hot gas collection device 7 is connected to a three-way pipeline 13. The exhaust end of the molding equipment 11 is connected to the three-way pipeline 13 through a centrifugal fan II 12. The output end of the three-way pipeline 13 is communicated with the inside of the stainless steel heat preservation water tank 4.

[0027] Referring to Figure 2 , 3 , the heat exchange tube 5 is in a snake shape and surrounds the inner wall of the dry sand container 1. The dry sand container 1 is connected to the inner wall of the dry sand container 1 through a number of fixing brackets a. Through the shape characteristics of the heat exchange tube 5 and its distribution position in the dry sand container 1, it is ensured that the heat exchange tube 5 can be in full contact with the dry sand inside the dry sand container 1, achieving a good heat exchange effect, and at the same time avoiding interference of the dry sand container 1 on the placement of the lost foam molding mold.

[0028] Referring to Figure 4The distribution pipeline 6 includes a water pump 61, a water inlet pipe 62, and a water outlet pipe 63. The water inlet of the water pump 61 is connected to the output end of the cooling tower 3. The discharge end of the water pump 61 is connected to the water inlet pipe 62 through a connecting pipe 3 65. The side wall of the water inlet pipe 62 is connected to a plurality of water inlet branches 67, and the plurality of water inlet branches 67 are respectively connected to the water inlet ends of the plurality of heat exchange tubes 5. The side wall of the water outlet pipe 63 is connected to a plurality of water outlet branches 64, and the plurality of water outlet branches 64 are respectively connected to the water outlet ends of the plurality of heat exchange tubes 5. The water outlet pipe 63 is connected to the output end of the cooling tower 3. The discharge end of the water pump 61 is connected to the water inlet pipe 62 through a connecting pipe 3 65. The side wall of the water inlet pipe 62 is connected to a plurality of water inlet branches 67, and the plurality of water inlet branches 67 are respectively connected to the water inlet ends of the plurality of heat exchange tubes 5. The end is connected with the interior of the stainless steel insulated water tank 4 through a connecting pipe four 66, and the water output from the cooling tower 3 is extracted by a water pump one 61, and is transported to the inside of the water inlet pipe 62 through a connecting pipe three 65. The water inside the water inlet pipe 62 enters into several heat exchange tubes 5 through several water inlet branches 67 for heat exchange, and the water flowing out of the heat exchange tube 5 enters into the inside of the water outlet pipe 63 through the water outlet branch pipe 64. The water inside the water outlet pipe 63 is input into the stainless steel insulated water tank 4 through a connecting pipe four 66 for heat storage.

[0029] Reference Figure 5 The stainless steel insulated water tank 4 includes a main container 41, an inner wall of the main container 41 is provided with an interlayer space 42, the output end of the three-way pipe 13 is connected to the inside of the interlayer space 42, the interlayer space 42 is filled with an activated carbon layer, and an outlet pipe 8 is installed on the side wall of the stainless steel insulated water tank 4, and the outlet pipe 8 is connected to the inside of the interlayer space 42. The high-temperature gas output through the three-way pipe 13 enters the interlayer space 42 to further heat the water inside the stainless steel insulated water tank 4, and the gas inside the interlayer space 42 can be discharged through the outlet pipe 8. Since the high-temperature gas generated during casting may contain harmful volatile organic compounds, direct discharge may cause certain effects on the environment or people. By filling the interlayer space 42 with an activated carbon layer, a certain purification effect can be achieved on the gas to avoid harm to the environment or people.

[0030] Reference Figure 6 The hot gas collecting device 7 includes an air intake device 71, a centrifugal fan 72, and an air intake pipe 73. The air intake device 71 is fixedly connected to the side walls of the dry sand containers 1. The air intake pipe 73 is installed at the air intake end of the centrifugal fan 72. The interior of the air intake pipe 73 is connected to the interior of the air intake device 71 through a connecting air duct 74. The exhaust end of the centrifugal fan 72 is connected to the port of the three-way pipe 13. The centrifugal fan 72 can be operated through the air intake pipe 73 and the connecting air duct 74 to exhaust air into the air intake device 71 to form a negative pressure, so that the air intake device 71 can absorb the hot air of the dry sand container 1 to achieve a hot air recovery effect. The hot air is output through the three-way pipe 13 of the centrifugal fan 72 and enters the stainless steel insulation water tank 4 for heat reuse.

[0031] Reference Figure 6, the air intake device 71 includes an L-shaped cabin plate 711. The horizontal plate of the L-shaped cabin plate 711 extends to the top of the dry sand container 1. The bottom of the horizontal plate of the L-shaped cabin plate 711 is provided with a dry air inlet 712. The air inlet 712 is communicated with the inside of the L-shaped cabin plate 711. Through the structure and shape setting of the air intake device 71, the L-shaped cabin plate 711 can achieve the effect of pumping air to the top of the dry sand container 1, so as to facilitate the absorption of the hot steam generated during the casting of the dry sand container 1.

[0032] Refer to Figure 5 , the water delivery mechanism 9 includes a second water pump 91 and a water delivery pipe 92. The second water pump 91 is installed inside the stainless steel heat preservation water tank 4. The water outlet end of the second water pump 91 is connected to the heat exchange mechanism 10 through the water delivery pipe 92. The second water pump 91 pumps the water inside the stainless steel heat preservation water tank 4 and discharges it through the water delivery pipe 92 to be conveyed to the inside of the heat exchange mechanism 10, thereby achieving the water delivery effect of the water delivery mechanism 9.

[0033] Refer to Figure 1 , the heat exchange mechanism 10 includes a first connecting pipe 101, a heat exchanger 102, and a second connecting pipe 103. The output end of the water delivery mechanism 9 is connected to the water inlet end of the heat exchanger 102 through the first connecting pipe 101. The heat exchanger 102 is installed inside the drying room 2. The water outlet end of the heat exchanger 102 is communicated with the second connecting pipe 103. The other end of the second connecting pipe 103 is connected with a first circulation branch pipe 105 and a second circulation branch pipe 106 through a three-way valve 104. The first circulation branch pipe 105 is communicated with the inside of the cooling tower 3, and the second circulation branch pipe 106 is communicated with the inside of the stainless steel heat preservation water tank 4. The high-temperature water output by the water delivery mechanism 9 is conveyed to the inside of the drying room 2 through the first connecting pipe 101 and is heat-exchanged through the heat exchanger 102, thereby increasing the temperature inside the drying room 2 and achieving the drying effect on the internal coating. After the heat-exchanged water by the heat exchanger 102 has its temperature reduced, it re-enters the inside of the cooling tower 3 through the three-way valve 104 and the first circulation branch pipe 105. And the water still has a certain residual temperature after being heat-exchanged by the heat exchanger 102, then it is input into the stainless steel heat preservation water tank 4 through the three-way valve 104 and the second circulation branch pipe 106.

[0034] The working principle of the present utility model: When the temperature in the dry sand mold cavity inside the dry sand container 1 reaches 280 to 300 degrees after the casting is completed, cold water is output from the cooling tower 3. The cold water is input into the heat exchange tube 5 through the distribution pipeline 6 to exchange heat with the dry sand. At this time, the temperature of the heat-exchanged water rises above 80 degrees. Then, the heat-exchanged water is input into the stainless steel heat preservation water tank 4 through the distribution pipeline 6 for heat storage, realizing the recovery of the heat dissipated by the cooling of the dry sand;

[0035] Afterwards, the heat and moisture inside the stainless steel heat preservation water tank 4 are output to the inside of the heat exchange mechanism 10 through the water delivery mechanism 9. Through the heat exchange mechanism 10, the hot water can be heat-exchanged with the temperature inside the drying room 2, increasing the temperature inside the drying room 2, facilitating the drying of the internal coating, and realizing the reuse of the heat dissipated during dry sand cooling;

[0036] When the forming equipment 11 outputs high-temperature steam during processing, it can be collected by the centrifugal fan II 12 and output to the inside of the stainless steel heat preservation water tank 4 through the three-way pipeline 13, thereby continuously heating the moisture inside the stainless steel heat preservation water tank 4, increasing the temperature of the moisture used for heat exchange with the inside of the drying room 2, and enhancing the drying effect of the coating inside the drying room 2. Similarly, through the gas collection device 7, the hot gas generated during the casting process of the dry sand mold cavity can be recovered and output to the inside of the stainless steel heat preservation water tank 4 through the three-way pipeline 13, realizing the recovery and reuse of waste heat;

[0037] After the heat exchange mechanism 10 participates in the heat exchange, if the temperature of the moisture inside it drops to a certain temperature, it is input into the cooling tower 3 for water circulation to participate in the next round of dry sand cooling, achieving an energy-saving effect. If the moisture inside the heat exchange mechanism 10 still has a certain temperature after heat exchange, it is re-input into the stainless steel heat preservation water tank 4 and participates in the heat exchange process inside the drying room 2 in the next cycle, making full use of the heat and further achieving an energy-saving effect.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. The present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery energy-saving structure for a lost foam casting line, comprising a plurality of dry sand containers (1), a drying room (2), a cooling tower (3), and a molding device (11), wherein the dry sand container (1) is used to fill dry sand and lost foam molding molds, the drying room (2) is used to dry coatings used for lost foam manufacturing, and the molding device (11) is manufactured by lost foam molding, characterized in that: It also comprises a stainless steel insulated water tank (4), a plurality of heat exchange tubes (5), and a heat exchange mechanism (10), wherein the plurality of heat exchange tubes (5) are respectively installed in the plurality of dry sand containers (1), and the plurality of heat exchange tubes (5) are connected to the cooling tower (3) and the stainless steel insulated water tank (4) through the adjustment pipeline (6), and a water delivery mechanism (9) is arranged inside the stainless steel insulated water tank (4), and the water delivery mechanism (9) is connected to the cooling tower (3) and the stainless steel insulated water tank (4) through the heat exchange mechanism (10), and the heat exchange mechanism (10) is used to transfer the water output by the water delivery mechanism (9) to heat inside the drying room (2); It also includes a hot gas collecting device (7), wherein the air inlet end of the hot gas collecting device (7) is connected to the plurality of dry sand containers (1), the air outlet end of the hot gas collecting device (7) is connected to a three-way pipeline (13), the exhaust end of the molding device (11) is connected to the three-way pipeline (13) through a second centrifugal fan (12), and the output end of the three-way pipeline (13) is connected to the inside of the stainless steel insulation water tank (4).

2. The waste heat recovery and energy-saving structure of the lost foam casting line according to claim 1 is characterized in that: The heat exchange tube (5) is serpentine-shaped and surrounds the inner wall of the dry sand container (1). The dry sand container (1) is connected to the inner wall of the dry sand container (1) via a plurality of fixing frames a.

3. The waste heat recovery and energy-saving structure of the lost foam casting line according to claim 1 is characterized in that: The distribution pipeline (6) includes a water pump (61), a water inlet pipe (62), and a water outlet pipe (63). The water inlet of the water pump (61) is connected to the output end of the cooling tower (3). The discharge end of the water pump (61) is connected to the water inlet pipe (62) through a connecting pipe (65). The side wall of the water inlet pipe (62) is connected to a plurality of water inlet branch pipes (67). The plurality of water inlet branch pipes (67) are respectively connected to the water inlet ends of the plurality of heat exchange pipes (5). The side wall of the water outlet pipe (63) is connected to a plurality of water outlet branch pipes (64). The plurality of water outlet branch pipes (64) are respectively connected to the water outlet ends of the plurality of heat exchange pipes (5). One end of the water outlet pipe (63) is connected to the interior of the stainless steel insulation water tank (4) through a connecting pipe (66).

4. The waste heat recovery and energy-saving structure of the lost foam casting line according to claim 1 is characterized in that: The stainless steel heat-insulating water tank (4) comprises a main container (41), an inner wall of the main container (41) is provided with an interlayer space (42), an output end of the three-way pipe (13) is connected to the inside of the interlayer space (42), the inside of the interlayer space (42) is filled with an activated carbon layer, and an air outlet pipe (8) is installed on the side wall of the stainless steel heat-insulating water tank (4), and the air outlet pipe (8) is connected to the inside of the interlayer space (42).

5. The waste heat recovery and energy-saving structure of the lost foam casting line according to claim 1 is characterized in that: The hot air collecting device (7) comprises an air intake device (71), a centrifugal fan (72), and an air intake pipe (73). The air intake device (71) is fixedly connected to the side walls of the plurality of dry sand containers (1). The air intake pipe (73) is installed at the air intake end of the centrifugal fan (72). The interior of the air intake pipe (73) is connected to the interior of the air intake device (71) via a connecting air duct (74). The exhaust end of the centrifugal fan (72) is connected to a port of a three-way pipeline (13).

6. The waste heat recovery and energy-saving structure of the lost foam casting line according to claim 5 is characterized in that: The air intake device (71) comprises an L-shaped panel (711), a transverse panel of the L-shaped panel (711) extending to the top of the dry sand container (1), a dry air inlet (712) being arranged at the bottom of the transverse panel of the L-shaped panel (711), and the air inlet (712) being in communication with the interior of the L-shaped panel (711).

7. The waste heat recovery and energy-saving structure of the lost foam casting line according to claim 4 is characterized in that: The water delivery mechanism (9) comprises a second water pump (91) and a water delivery pipe (92); the second water pump (91) is installed inside the stainless steel heat-insulating water tank (4); and the water outlet end of the second water pump (91) is connected to the heat exchange mechanism (10) via the water delivery pipe (92).

8. The waste heat recovery and energy-saving structure of the lost foam casting line according to claim 1 is characterized in that: The heat exchange mechanism (10) comprises a connecting pipe 1 (101), a heat exchanger (102), and a connecting pipe 2 (103); the output end of the water delivery mechanism (9) is connected to the water inlet end of the heat exchanger (102) via the connecting pipe 1 (101); the heat exchanger (102) is installed inside the drying room (2); the water outlet end of the heat exchanger (102) is connected to the connecting pipe 2 (103); the other end of the connecting pipe 2 (103) is connected to a circulation branch pipe 1 (105) and a circulation branch pipe 2 (106) via a three-way valve (104); the circulation branch pipe 1 (105) is connected to the inside of the cooling tower (3); and the circulation branch pipe 2 (106) is connected to the inside of the stainless steel insulation water tank (4).

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