Coke oven ascension pipe heat exchange device

Abstract

The utility model relates to a heat exchange device for an ascending pipe of a coke oven and belongs to the technical field of improvement of the ascending pipe of the coke oven. Comprising an upper connecting plate and a lower connecting plate which are parallel to each other, a right water tank and a left water tank which are arranged at intervals are connected between the upper connecting plate and the lower connecting plate, the two ends of a central heat exchange tube are welded to the middle of the upper connecting plate and the middle of the lower connecting plate respectively, and an upper end hole and a lower end hole are coaxial with the central heat exchange tube and are equal in diameter. A plurality of groups of heat exchange rods A are arranged between the central heat exchange tube and the right water tank, and two ends of each heat exchange rod A are respectively inserted into the central heat exchange tube and the right water tank. The utility model has the following beneficial effects: when high-temperature flue gas flows through the inner hole of the central heat exchange tube, the flue gas is respectively used for heating circulating water in the right water tank and the left water tank under the heat exchange action of the heat exchange rod A and the heat exchange rod B, and the heated water flows out from the hot water outlet A and the hot water outlet B respectively, so that the purpose of heat exchange is achieved, and the heat exchange efficiency is improved. Therefore, the recovery of the waste heat of the raw gas is realized.

Description

Technical Field

[0001] The utility model relates to a coke oven riser heat exchange device, belonging to the technical field of coke oven riser transformation. Background Art

[0002] As a major coke producer, my country has become a major pillar of the global coke industry. The coking process primarily involves the high-temperature dry distillation of coal. Coking coal is heated and dry-distilled in a coke oven, isolated from air, to produce coke and a large amount of volatile matter, known as raw coal gas.

[0003] During the coking process in a coking plant, the temperature of the raw gas escaping from the carbonization chamber through the riser is about 650℃-750℃, and the heat it brings out accounts for about 36% of the total heat output of the coke oven. Generally, the coking plant will recycle and reuse this part of the heat to achieve the purpose of resource conservation and environmental friendliness.

[0004] For example, Patent No. 202321544293.0 discloses a coke oven riser heat exchanger, which includes a flue, a heat exchange assembly disposed outside the flue, and an outer tube and a baffle. The outer tube surrounds the flue, and the baffle is installed in a chamber enclosed by the flue and the outer tube, dividing the chamber into a first heat exchange zone and a second heat exchange zone. The first and second heat exchange zones are interconnected, and a heat exchange medium inlet pipe is disposed at the bottom of the first heat exchange zone, while a heat exchange medium outlet pipe is disposed at the bottom of the second heat exchange zone.

[0005] The current technology is not comprehensive and has the following disadvantages: the heat extraction pipeline is easily damaged, the heat extraction medium is easily leaked into the gas collecting pipe, resulting in slag pipe phenomenon, and the maintenance cost is high.

[0006] In order to solve one of the above problems, a coke oven riser heat exchange device is urgently needed. Utility Model Content

[0007] In view of the above deficiencies in the existing technology, the technical problem to be solved by the present invention is: how to recover the waste heat of the coke oven riser, improve the reliability of the pipeline, avoid leakage of the heat medium, and improve the safety and reliability of heat extraction. For this purpose, a coke oven riser heat exchange device is provided.

[0008] The coke oven riser heat exchange device described in the present invention is characterized in that: it includes an upper connecting plate and a lower connecting plate parallel to each other, and a right water tank and a left water tank are connected between the upper connecting plate and the lower connecting plate. The two ends of the central heat exchange tube are respectively welded to the middle parts of the upper connecting plate and the lower connecting plate. The upper connecting plate and the lower connecting plate respectively have an upper end hole and a lower end hole that match the inner hole of the central heat exchange tube. The upper end hole and the lower end hole are coaxial with the central heat exchange tube and have the same diameter. There are multiple groups of heat exchange rods A between the central heat exchange tube and the right water tank, and the two ends of the heat exchange rod A are respectively inserted into the central heat exchange tube and the right water tank. There are multiple groups of heat exchange rods B between the central heat exchange tube and the right water tank, and the two ends of the heat exchange rod B are respectively inserted into the central heat exchange tube and the left water tank. The water tank also includes an upper reinforcing plate A connected to the upper outer wall of the right water tank and an upper reinforcing plate B connected to the bottom outer wall of the right water tank. The other end of the upper reinforcing plate A is welded to the outer wall of the central heat exchange tube, and the upper side of the upper reinforcing plate A is welded to the upper connecting plate. The other end of the upper reinforcing plate B is welded to the outer wall of the central heat exchange tube, and the lower side of the upper reinforcing plate B is welded to the lower connecting plate. A cold water inlet A is provided at the bottom of the right water tank, and a hot water outlet A is provided at the top of the right water tank. A cold water inlet B is provided at the bottom of the left water tank, and a hot water outlet B is provided at the top of the right water tank. A plurality of groups of upper threaded connecting columns are provided on the upper surface of the upper connecting plate, and the plurality of groups of upper threaded connecting columns are arranged around the center line of the central heat exchange tube.

[0009] The upper threaded connection column is matched with the corresponding nut to connect with the bridge pipe. The coke oven riser is installed in the flue hole on the top of the furnace. The length of the original coke oven riser is shortened, and the device is installed between the coke oven riser and the bridge pipe. The circulating water flows into the right water tank and the left water tank from the cold water inlet A and the cold water inlet B respectively. When the high-temperature flue gas flows through the inner hole of the central heat exchange tube, it is used to heat the circulating water in the right water tank and the left water tank respectively through the heat exchange effect of the heat exchange rod A and the heat exchange rod B, and the heated water will flow out from the hot water outlet A and the hot water outlet B respectively, thereby achieving the purpose of heat exchange and realizing the recovery of the waste heat of the raw coal gas.

[0010] Preferably, the cross-section of the inner wall of the right water tank is a runway-shaped structure, with semicircular arc segments on both sides of the runway. The end of the heat exchange rod A passes through the semicircular arc segment and extends into the right water tank, which is beneficial to the increase of the circulating water temperature of the right water tank and the left water tank.

[0011] Preferably, a lifting lug is provided at each end of the upper surface of the upper connecting plate, so as to facilitate the lifting of the device.

[0012] Preferably, the lower surface of the lower connecting plate is provided with multiple groups of lower threaded connecting columns, which are arranged around the center line of the central heat exchange tube and are used to cooperate with corresponding nuts to connect with the coke oven riser.

[0013] Preferably, a lifting support structure for supporting the lower connecting plate is installed on the coke oven ascending pipe.

[0014] Preferably, the lifting support structure includes a pipe clamp mounted on the coke oven riser, and a second supporting cylinder and a first supporting cylinder symmetrically arranged on either side of the coke oven riser. The telescopic ends of the second supporting cylinder and the first supporting cylinder are respectively supported on the lower surface of the lower connecting plate, and the cylinder bodies of the second supporting cylinder and the first supporting cylinder are respectively supported on the furnace roof surface. A first connecting rod is connected between the second supporting cylinder and the pipe clamp, and a second connecting rod is connected between the first supporting cylinder and the pipe clamp. This effectively supports the device, and the overall support is stable and not prone to tipping.

[0015] Preferably, the system further includes a hydraulic control system for driving the extension and retraction of the first and second supporting cylinders. The hydraulic control system includes a fuel tank, a hydraulic pump, and a three-position, four-way reversing valve. Port P of the three-position, four-way reversing valve is connected to the oil outlet of the hydraulic pump. Port A of the three-position, four-way reversing valve is connected to the rodless chamber of the first supporting cylinder 14 via a fuel pipe. Port T of the three-position, four-way reversing valve and the oil inlet of the hydraulic pump are both connected to the fuel tank. The rod chamber of the first supporting cylinder is connected to the rodless chamber of the second supporting cylinder via a fuel pipe. Port B of the three-position, four-way reversing valve is connected to the rod chamber of the first supporting cylinder via a pipeline. The first and second supporting cylinders are of the same model. This system achieves synchronous extension of the first and second supporting cylinders and avoids skew caused by asynchronous extension.

[0016] Preferably, it also includes an upper reinforcing plate C connected to the upper outer wall of the left water tank and an upper reinforcing plate D connected to the bottom outer wall of the left water tank. The other end of the upper reinforcing plate C is welded to the outer wall of the central heat exchange tube, and the upper side of the upper reinforcing plate C is welded to the upper connecting plate. The other end of the upper reinforcing plate D is welded to the outer wall of the central heat exchange tube, and the lower side of the upper reinforcing plate D is welded to the lower connecting plate. This enhances the structural connection strength.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The coke oven riser heat exchange device described in the present invention, when the high-temperature flue gas flows through the inner hole of the central heat exchange tube, is used to heat the circulating water in the right water tank and the left water tank respectively through the heat exchange effect of the heat exchange rod A and the heat exchange rod B, and the heated water will flow out from the hot water outlet A and the hot water outlet B respectively, thereby achieving the purpose of heat exchange, thereby realizing the recovery of the waste heat of the raw coal gas, and the structure of the device is simple, stable and easy to operate.

[0019] The coke oven riser heat exchange device described in the utility model is provided with a lifting support structure for supporting the lower connecting plate installed on the coke oven riser, which effectively supports the device, has good overall support stability, and is not prone to tipping over.

[0020] The coke oven riser heat exchange device described in the present invention has a cross-section of the inner wall of the right water tank of a runway-type structure, with semicircular arc segments on both sides of the runway. The end of the heat exchange rod A passes through the semicircular arc segment and extends into the right water tank, which is beneficial to increasing the circulating water temperature of the right water tank and the left water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 It is a schematic diagram of the AA section;

[0024] Figure 3 It is an enlarged view of the lifting support structure;

[0025] Figure 4 This is the schematic diagram of the hydraulic control system.

[0026] In the figure: 1, upper connecting plate 2, right water tank 2.1, cold water inlet A 2.2, hot water outlet A 3, lower connecting plate 4, left water tank 4.1, cold water inlet B 4.2, hot water outlet B 5, central heat exchange tube 6, heat exchange rod A 7, heat exchange rod B 8, upper reinforcement plate A 9, upper reinforcement plate B 10, upper threaded connecting column 11, coke oven riser 12, lifting lug 13, bridge pipe 14, first supporting cylinder 15, pipe clamp 16, first connecting rod 17, second connecting rod 18, second supporting cylinder 19, oil tank 20, hydraulic pump 21, two-position four-way reversing valve. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings: The present invention will be further illustrated below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0028] Example 1, as Figure 1-2As shown, the coke oven riser heat exchange device comprises an upper connecting plate 1 and a lower connecting plate 3 parallel to each other, and a right water tank 2 and a left water tank 4 are connected between the upper connecting plate 1 and the lower connecting plate 3, and the two ends of the central heat exchange tube 5 are respectively welded to the middle of the upper connecting plate 1 and the lower connecting plate 3, and the upper connecting plate 1 and the lower connecting plate 3 respectively have an upper end hole and a lower end hole that match the inner hole of the central heat exchange tube 5, and the upper end hole and the lower end hole are coaxial with the central heat exchange tube 5 and have the same diameter, and a plurality of groups of heat exchange rods A6 are provided between the central heat exchange tube 5 and the right water tank 2, and the two ends of the heat exchange rod A6 are respectively inserted into the central heat exchange tube 5 and the right water tank 2, and a plurality of groups of heat exchange rods B7 are provided between the central heat exchange tube 5 and the right water tank 2, and the two ends of the heat exchange rod B7 are respectively inserted into the central heat exchange tube 5 and the left water tank 4, and further comprises a connecting An upper reinforcing plate A8 is connected to the upper outer wall of the right water tank 2, and an upper reinforcing plate B9 is connected to the bottom outer wall of the right water tank 2. The other end of the upper reinforcing plate A8 is welded to the outer wall of the central heat exchange tube 5, and the upper side of the upper reinforcing plate A8 is welded to the upper connecting plate 1. The other end of the upper reinforcing plate B9 is welded to the outer wall of the central heat exchange tube 5, and the lower side of the upper reinforcing plate B9 is welded to the lower connecting plate 3. A cold water inlet A2.1 is provided at the bottom of the right water tank 2, and a hot water outlet A2.2 is provided at the top of the right water tank 2. A cold water inlet B4.1 is provided at the bottom of the left water tank 4, and a hot water outlet B4.2 is provided at the top of the right water tank 2. A plurality of groups of upper threaded connecting columns 10 are provided on the upper surface of the upper connecting plate 1, and the plurality of groups of upper threaded connecting columns 10 are arranged around the center line of the central heat exchange tube 5.

[0029] The upper threaded connecting column 10 is matched with the corresponding nut to be connected to the bridge pipe 13. The coke oven riser 11 is installed in the flue hole on the top of the furnace. The length of the original coke oven riser 11 is shortened, and the present device is installed between the coke oven riser 11 and the bridge pipe 13. The circulating water flows into the right water tank 2 and the left water tank 4 from the cold water inlet A2.1 and the cold water inlet B4.1 respectively. When the high-temperature flue gas flows through the inner hole of the central heat exchange tube 5, it is used to heat the circulating water in the right water tank 2 and the left water tank 4 respectively through the heat exchange effect of the heat exchange rod A6 and the heat exchange rod B7, and the heated water will flow out from the hot water outlet A2.2 and the hot water outlet B4.2 respectively, thereby achieving the purpose of heat exchange and realizing the recovery of the waste heat of the raw coal gas.

[0030] Example 2, as Figure 1-3As shown, the coke oven riser heat exchange device comprises an upper connecting plate 1 and a lower connecting plate 3 parallel to each other, and a right water tank 2 and a left water tank 4 are connected between the upper connecting plate 1 and the lower connecting plate 3, and the two ends of the central heat exchange tube 5 are respectively welded to the middle of the upper connecting plate 1 and the lower connecting plate 3, and the upper connecting plate 1 and the lower connecting plate 3 respectively have an upper end hole and a lower end hole that match the inner hole of the central heat exchange tube 5, and the upper end hole and the lower end hole are coaxial with the central heat exchange tube 5 and have the same diameter, and a plurality of groups of heat exchange rods A6 are provided between the central heat exchange tube 5 and the right water tank 2, and the two ends of the heat exchange rod A6 are respectively inserted into the central heat exchange tube 5 and the right water tank 2, and a plurality of groups of heat exchange rods B7 are provided between the central heat exchange tube 5 and the right water tank 2, and the two ends of the heat exchange rod B7 are respectively inserted into the central heat exchange tube 5 and the left water tank 4, and further comprises a connecting An upper reinforcing plate A8 is connected to the upper outer wall of the right water tank 2, and an upper reinforcing plate B9 is connected to the bottom outer wall of the right water tank 2. The other end of the upper reinforcing plate A8 is welded to the outer wall of the central heat exchange tube 5, and the upper side of the upper reinforcing plate A8 is welded to the upper connecting plate 1. The other end of the upper reinforcing plate B9 is welded to the outer wall of the central heat exchange tube 5, and the lower side of the upper reinforcing plate B9 is welded to the lower connecting plate 3. A cold water inlet A2.1 is provided at the bottom of the right water tank 2, and a hot water outlet A2.2 is provided at the top of the right water tank 2. A cold water inlet B4.1 is provided at the bottom of the left water tank 4, and a hot water outlet B4.2 is provided at the top of the right water tank 2. A plurality of groups of upper threaded connecting columns 10 are provided on the upper surface of the upper connecting plate 1, and the plurality of groups of upper threaded connecting columns 10 are arranged around the center line of the central heat exchange tube 5.

[0031] Installation process: first install the coke oven riser 11 on the furnace top, then install the pipe clamp 15 on the coke oven riser 11, and fix the second supporting cylinder 18 and the first supporting cylinder 14 through the pipe clamp 15, the second connecting rod 17 and the first connecting rod 16, and then use the lifting ear 12 to lift the upper connecting plate 1 and the parts connected with it, so that the lower connecting plate 3 and the coke oven riser 11 are assembled, and then the lower connecting plate 3 is auxiliary supported by the first supporting cylinder 14 and the second supporting cylinder 18, and finally the bridge pipe 13 is installed on the upper connecting plate 1 through the upper threaded connecting column 10.

[0032] Furthermore, the cross-section of the inner wall of the right water tank 2 is a runway-shaped structure, with semicircular arc segments on both sides of the runway. The end of the heat exchange rod A6 passes through the semicircular arc segment and extends into the right water tank 2, which is beneficial to the improvement of the circulating water temperature of the right water tank 2 and the left water tank 4.

[0033] Furthermore, a lifting lug 12 is provided at each end of the upper surface of the upper connecting plate 1, so as to facilitate the lifting of the device.

[0034] Furthermore, the lower surface of the lower connecting plate 3 is provided with multiple groups of lower threaded connecting columns, which are arranged around the center line of the central heat exchange tube 5 and are used to cooperate with corresponding nuts to connect with the coke oven riser 11.

[0035] Furthermore, a lifting support structure for supporting the lower connecting plate 3 is installed on the coke oven ascending pipe 11 .

[0036] Furthermore, the lifting support structure includes a pipe clamp 15 mounted on the coke oven riser 11, and a second supporting cylinder 18 and a first supporting cylinder 14 symmetrically arranged on either side of the coke oven riser 11. The telescopic ends of the second supporting cylinder 18 and the first supporting cylinder 14 are respectively supported on the lower surface of the lower connecting plate 3, and the cylinder bodies of the second supporting cylinder 18 and the first supporting cylinder 14 are respectively supported on the furnace roof surface. A first connecting rod 16 is connected between the second supporting cylinder 18 and the pipe clamp 15, and a second connecting rod 17 is connected between the first supporting cylinder 14 and the pipe clamp 15. This effectively supports the device, and the overall support is stable and not prone to tipping.

[0037] Furthermore, it also includes an upper reinforcing plate C connected to the upper outer wall of the left water tank 4 and an upper reinforcing plate D connected to the bottom outer wall of the left water tank 4. The other end of the upper reinforcing plate C is welded to the outer wall of the central heat exchange tube 5, and the upper side of the upper reinforcing plate C is welded to the upper connecting plate 1. The other end of the upper reinforcing plate D is welded to the outer wall of the central heat exchange tube 5, and the lower side of the upper reinforcing plate D is welded to the lower connecting plate 3. This enhances the structural connection strength.

[0038] Example 3, reference Figure 4 This embodiment is further improved upon Example 2 and further includes a hydraulic control system for driving the extension and retraction of the first supporting cylinder 14 and the second supporting cylinder 18. The hydraulic control system comprises an oil tank 19, a hydraulic pump 20, and a three-position, four-way reversing valve 21. Port P of the three-position, four-way reversing valve 21 is connected to the oil outlet of the hydraulic pump 20, port A of the three-position, four-way reversing valve 21 is connected to the rodless chamber of the first supporting cylinder 14 via an oil pipe, port T of the three-position, four-way reversing valve 21 and the oil inlet of the hydraulic pump 20 are both connected to the oil tank, the rod chamber of the first supporting cylinder 14 is connected to the rodless chamber of the second supporting cylinder 18 via an oil pipe, and port B of the three-position, four-way reversing valve 21 is connected to the rod chamber of the first supporting cylinder 14 via a pipe. The first and second supporting cylinders 14, 18 are of the same model. This achieves synchronous extension of the first and second supporting cylinders 14, 18, and avoids skew caused by asynchronous extension.

[0039] The coke oven riser heat exchange device described in the present invention is used to heat the circulating water in the right water tank and the left water tank respectively through the heat exchange effect of the heat exchange rod A and the heat exchange rod B when the high-temperature flue gas flows through the inner hole of the central heat exchange tube, and the heated water will flow out from the hot water outlet A and the hot water outlet B respectively, thereby achieving the purpose of heat exchange and realizing the recovery of the waste heat of the raw coal gas.

[0040] The coke oven riser heat exchange device described in the utility model is provided with a lifting support structure for supporting the lower connecting plate installed on the coke oven riser, which effectively supports the device, has good overall support stability, and is not prone to tipping over.

[0041] The coke oven riser heat exchange device described in the present invention has a cross-section of the inner wall of the right water tank of a runway-type structure, with semicircular arc segments on both sides of the runway. The end of the heat exchange rod A passes through the semicircular arc segment and extends into the right water tank, which is beneficial to increasing the circulating water temperature of the right water tank and the left water tank.

[0042] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

[0043] Any matters not described in detail in the present invention are well-known technologies to those skilled in the art.

Claims

1. A coke oven riser heat exchange device, characterized in that: It includes an upper connecting plate and a lower connecting plate parallel to each other, and the right water tank and the left water tank are connected to each other with an interval between the upper connecting plate and the lower connecting plate, and the two ends of the central heat exchange tube are welded to the middle of the upper connecting plate and the lower connecting plate respectively, and the upper connecting plate and the lower connecting plate respectively have an upper end hole and a lower end hole that match the inner hole of the central heat exchange tube, and the upper end hole and the lower end hole are coaxial with the central heat exchange tube and have the same diameter. There are multiple groups of heat exchange rods A between the central heat exchange tube and the right water tank, and the two ends of the heat exchange rod A are respectively inserted into the central heat exchange tube and the right water tank. There are multiple groups of heat exchange rods B between the central heat exchange tube and the right water tank, and the two ends of the heat exchange rod B are respectively inserted into the central heat exchange tube and the left water tank. It also includes a tube connected to the right water An upper reinforcing plate A on the upper outer wall of the tank and an upper reinforcing plate B connected to the outer wall of the bottom of the right water tank, the other end of the upper reinforcing plate A is welded to the outer wall of the central heat exchange tube, and the upper side of the upper reinforcing plate A is welded to the upper connecting plate, the other end of the upper reinforcing plate B is welded to the outer wall of the central heat exchange tube, and the lower side of the upper reinforcing plate B is welded to the lower connecting plate, a cold water inlet A is provided at the bottom of the right water tank, a hot water outlet A is provided at the top of the right water tank, a cold water inlet B is provided at the bottom of the left water tank, and a hot water outlet B is provided at the top of the right water tank, a plurality of groups of upper threaded connecting columns are provided on the upper surface of the upper connecting plate, and the plurality of groups of upper threaded connecting columns are arranged around the center line of the central heat exchange tube.

2. The coke oven riser heat exchange device according to claim 1, characterized in that: The cross-section of the inner wall of the right water tank is a runway-shaped structure, with semicircular arc segments on both sides of the runway. The end of the heat exchange rod A passes through the semicircular arc segment and extends into the right water tank, which is beneficial to the increase of the circulating water temperature of the right water tank and the left water tank.

3. The coke oven riser heat exchange device according to claim 2, characterized in that: Two ends of the upper surface of the upper connecting plate are respectively provided with a lifting lug.

4. The coke oven riser heat exchange device according to claim 3, characterized in that: The lower surface of the lower connecting plate is provided with a plurality of groups of lower threaded connecting columns, which are arranged around the center line of the central heat exchange tube and are used to cooperate with corresponding nuts to connect with the coke oven riser.

5. The coke oven riser heat exchange device according to claim 4, characterized in that: A lifting support structure for supporting the lower connecting plate is installed on the coke oven ascending pipe.

6. The coke oven riser heat exchange device according to claim 5, characterized in that: The lifting support structure includes a pipe clamp installed on the coke oven riser and a second supporting oil cylinder and a first supporting oil cylinder symmetrically arranged on both sides of the coke oven riser, the telescopic ends of the second supporting oil cylinder and the first supporting oil cylinder are respectively supported on the lower surface of the lower connecting plate, the cylinder bodies of the second supporting oil cylinder and the first supporting oil cylinder are respectively supported on the furnace top surface, a first connecting rod is connected between the second supporting oil cylinder and the pipe clamp, and a second connecting rod is connected between the first supporting oil cylinder and the pipe clamp.

7. The coke oven riser heat exchange device according to claim 6, characterized in that: It also includes an upper reinforcing plate C connected to the upper outer wall of the left water tank and an upper reinforcing plate D connected to the bottom outer wall of the left water tank. The other end of the upper reinforcing plate C is welded to the outer wall of the central heat exchange tube, and the upper side of the upper reinforcing plate C is welded to the upper connecting plate. The other end of the upper reinforcing plate D is welded to the outer wall of the central heat exchange tube, and the lower side of the upper reinforcing plate D is welded to the lower connecting plate.

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