WNS boiler with external hearth

Abstract

The utility model relates to the technical field of WNS boilers, in particular to a WNS boiler with an external hearth, which comprises the WNS boiler and the external hearth which are detachably connected, a water inlet and a boiler chamber which are communicated with each other are arranged on the WNS boiler, a steam-water separator and a flue gas structure are fixedly arranged in the boiler chamber of the WNS boiler, and a feed port, a combustion chamber and a flue gas pipeline which are communicated with each other are arranged on the external hearth. A heat exchange structure is fixedly arranged in a combustion chamber of the external hearth, the smoke pipeline is detachably connected with the WNS boiler and communicated with the smoke structure, and the heat exchange structure is fixedly connected and communicated with the top and the bottom of the boiler cavity through a steam pipeline and a water cooling pipeline. According to the WNS boiler with the external hearth, the external hearth needs to replace a burner, the external hearth and the WNS boiler jointly act to produce high-temperature steam, the external hearth and the WNS boiler are independent, and the WNS boiler and the external hearth are convenient to assemble and transfer.

Description

Technical Field

[0001] This utility model relates to the field of WNS boiler technology, specifically to a WNS boiler with an external furnace. Background Technology

[0002] WNS steam boilers refer to fully automatic oil (gas) steam boilers. They employ a horizontal, internally combusted, fully wet-back design with high-efficiency threaded smoke tubes and a comprehensive insulation enclosure. The boiler's thermal efficiency reaches over 85%. Its novel design, rational structure, and excellent process performance give it exceptional quality. Currently, most WNS steam boilers are one-piece structures, which are difficult to assemble and inconvenient to transport. Therefore, there is an urgent need for a WNS boiler with an external furnace to solve these problems. Utility Model Content

[0003] To address the technical challenges of existing WNS steam boilers, which are mostly integrated structures, making assembly difficult and transportation inconvenient, this invention provides a WNS boiler with an external furnace. The external furnace replaces the burner, and the external furnace and the WNS boiler work together to produce high-temperature steam. Furthermore, the external furnace and the WNS boiler are independent of each other, making assembly and transportation of both the WNS boiler and the external furnace more convenient.

[0004] This utility model provides a WNS boiler with an external furnace, comprising a detachably connected WNS boiler and an external furnace. The WNS boiler is provided with a communicating water inlet and a furnace cavity. A steam-water separator and a flue gas structure are fixedly installed inside the furnace cavity of the WNS boiler. The external furnace is provided with a communicating feed inlet, a combustion chamber, and a flue gas pipe. A heat exchange structure is fixedly installed inside the combustion chamber of the external furnace. The flue gas pipe is detachably connected to the WNS boiler and communicates with the flue gas structure. The heat exchange structure is fixedly connected to and communicates with the top and bottom of the furnace cavity through a steam pipe and a water-cooled pipe, respectively.

[0005] Furthermore, the heat exchange structure includes a third water tank, a first water tank, and a second water tank fixedly installed on the external furnace. The third water tank is fixedly connected to and communicates with the top of the furnace cavity through a steam pipe. The third water tank is also connected to both the first and second water tanks. The first and second water tanks are fixedly connected to and communicate with the bottom of the furnace cavity through water-cooling pipes. The first water tank is fixedly connected to and communicates with the second water tank through several cooling pipes. A combustion chamber is formed between the external furnace and the several cooling pipes, and the third water tank, the first water tank, and the second water tank are located within the combustion chamber. The several cooling pipes are evenly spaced and uniformly arranged.

[0006] Furthermore, the third water tank is fixedly installed at the top of the outer furnace, while the first and second water tanks are fixedly installed at the bottom of the outer furnace and positioned opposite each other. The third water tank is fixedly connected to and communicates with the first water tank via several first gas pipes, and is also fixedly connected to and communicates with the second water tank via several second gas pipes. These first and second gas pipes are fixedly installed on the combustion chamber sidewall of the outer furnace and are evenly spaced. Cooling water enters the third water tank through the first and second gas pipes.

[0007] Furthermore, the steam-water separator is fixedly installed at the top of the furnace cavity. The separator is equipped with an exhaust pipe extending to the outside of the furnace cavity, and an air inlet and a drain pipe located inside the furnace cavity. The drain pipe is located above the water inlet, and the water inlet is located above the second flue pipe. The water inlet of the WNS boiler is fixedly connected to the water inlet pipe, and the water inlet pipe is located outside the WNS boiler. The high-temperature steam-water mixture in the third water tank enters the top of the furnace cavity through a steam pipe. Then, the high-temperature steam-water mixture enters the steam-water separator through the air inlet. Inside the separator, the high-temperature steam-water mixture undergoes steam-water separation to form high-temperature steam and liquid. The high-temperature steam is discharged outside the furnace cavity through the final exhaust pipe for subsequent use, while the liquid returns to the furnace cavity through the drain pipe for recycling.

[0008] Furthermore, an ash hopper is provided outside the outer furnace chamber, located below several cooling pipes. The ash produced after the material burns out falls into the ash hopper between two cooling pipes, allowing for periodic cleaning of the ash in the hopper.

[0009] Furthermore, the flue gas structure includes a main flue pipe fixedly installed within the furnace cavity, and several first flue pipes and second flue pipes. One end of the main flue pipe is connected to a flue gas duct, and the other end of the main flue pipe is fixedly connected to and communicates with one end of each of the several first flue pipes. The WNS boiler is equipped with a flue gas inlet and a flue gas outlet. The other ends of the several first flue pipes are connected to and communicate with the flue gas inlet, and both ends of the several second flue pipes are fixedly connected to and communicate with the flue gas inlet and the flue gas outlet, respectively. The main flue pipe and the several first and second flue pipes achieve three-pass heat exchange of the high-temperature flue gas.

[0010] Furthermore, it also includes an economizer and a condenser fixedly installed outside the WNS boiler and connected to each other. The economizer is located on the side of the WNS boiler away from the external furnace. The economizer is detachably connected to the WNS boiler, and the flue gas outlet is connected to the economizer. The low-temperature flue gas passes through the flue gas outlet and then passes through the economizer and condenser for heat exchange again. The low-temperature flue gas is finally converted into liquid and discharged through the condenser, further recovering the heat of the low-temperature flue gas.

[0011] Furthermore, a third connecting plate is fixedly installed on the economizer, and a fourth connecting plate is fixedly installed on the outside of the WNS boiler. The third and fourth connecting plates are screwed together. The third and fourth connecting plates are fixedly connected by bolts and nuts, and the flue gas outlet is connected to the economizer.

[0012] Furthermore, a first connecting plate is fixedly installed on the flue gas duct, and a second connecting plate is fixedly installed on the outside of the WNS boiler. The first and second connecting plates are screwed together. By disassembling and assembling the first and second connecting plates, the external furnace and the WNS boiler can be detached and connected.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention relates to a WNS boiler with an external furnace, in which the external furnace replaces the burner. The external furnace and the WNS boiler work together to produce high-temperature steam. Furthermore, the external furnace and the WNS boiler are independent of each other, and the assembly and transportation of the WNS boiler and the external furnace are relatively convenient. Attached Figure Description

[0015] Figure 1 This is a side sectional view of the WNS boiler with an external furnace according to this utility model.

[0016] Figure 2 This is a utility model Figure 1 Enlarged structural diagram of A in the middle;

[0017] Figure 3 This is a utility model Figure 1 Enlarged structural diagram of B in the middle;

[0018] Figure 4 This is a utility model Figure 1 Enlarged schematic diagram of the structure of C;

[0019] Figure 5 This is a top sectional view of the WNS boiler with an external furnace according to this utility model.

[0020] Figure 6 This is a side sectional view of the external furnace chamber of this utility model.

[0021] The numbers in the attached diagram are:

[0022] 1. External furnace chamber; 11. Feed inlet; 12. Combustion chamber; 13. Flue gas duct; 131. First connecting plate; 14. Third water tank; 15. First water tank; 16. Second water tank; 17. Cooling pipe; 18. First gas pipe; 19. Second gas pipe; 2. WNS boiler; 21. Furnace cavity; 22. Steam-water separator; 221. Exhaust pipe; 222. Drain pipe; 23. Water inlet pipe; 24. Main flue pipe; 25. First flue pipe; 26. Second flue pipe; 27. Flue gas inlet; 28. Flue gas outlet; 3. Economizer; 31. Third connecting plate; 4. Condenser; 5. Steam duct; 6. Water-cooled duct; 7. Ash hopper; 8. Second connecting plate; 9. Fourth connecting plate. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] like Figures 1-6 As shown, a WNS boiler with an external furnace includes a detachably connected WNS boiler 2 and an external furnace 1. The WNS boiler 2 has a communicating water inlet and a furnace chamber 21. A steam-water separator 22 and a flue gas structure are fixedly installed inside the furnace chamber 21 of the WNS boiler 2. The external furnace 1 has a communicating feed inlet 11, a combustion chamber 12, and a flue gas duct 13. A heat exchange structure is fixedly installed inside the combustion chamber 12 of the external furnace 1. The flue gas duct 13 is detachably connected to the WNS boiler 2 and communicates with the flue gas structure. The heat exchange structure is fixedly connected to and communicates with the top and bottom of the furnace chamber 21 through a steam pipe 5 and a water-cooled pipe 6, respectively. The structure of the steam-water separator 22 is prior art and will not be described in detail here.

[0025] In operation, the WNS boiler 2 and the external furnace 1 are fixed to the working ground. The external furnace 1 is fixedly connected to the WNS boiler 2 via the flue gas duct 13. External cooling water is continuously supplied to the furnace chamber 21 of the WNS boiler 2 through the inlet. The cooling water submerges the flue gas structure, and the water level is below the steam-water separator 22. Simultaneously, the cooling water enters the heat exchange structure through the water-cooling pipe 6. When relocation is required, the WNS boiler 2 and the external furnace 1 can be disassembled for independent relocation, making it more convenient. The WNS boiler 2 is equipped with rotating rollers to further facilitate its relocation. When in use, the WNS boiler 2 is locked to the working ground via external columns, and the rollers cannot move the WNS boiler 2 during this time. The WNS boiler 2 is also equipped with a pressure gauge and a safety valve. The pressure gauge is used to detect the pressure of the high-temperature steam-water mixture, and the safety valve can be opened to release the gas (high-temperature steam-water mixture), ensuring that the WNS boiler 2 is in normal working condition.

[0026] The working process of the WNS boiler with an external furnace in this embodiment is as follows: Biomass material enters the combustion chamber 12 of the external furnace 1 through the feed inlet 11 for high-temperature combustion. The energy generated by the combustion of the material exchanges heat with the cooling water in the heat exchange structure, and the cooling water vaporizes to form a high-temperature steam-water mixture. This high-temperature steam-water mixture enters the top of the furnace chamber 21 through the steam pipe 5. The mixture then enters the steam-water separator 22 for steam-water separation to form high-temperature steam. The high-temperature steam in the steam-water separator 22 is finally discharged outside the furnace chamber 21 for further utilization, while the liquid in the separator returns to the furnace chamber 21 for recycling. The high-temperature flue gas generated by the combustion of the material enters the flue gas structure through the flue gas pipe 13. The high-temperature flue gas in the flue gas structure exchanges heat with the cooling water in the furnace chamber 21 to become low-temperature flue gas, which is finally discharged outside the WNS boiler 2 through the flue gas structure. The external furnace 1 and WNS boiler 2 can be configured with corresponding dimensions according to the required high-temperature steam evaporation rate.

[0027] This embodiment features a WNS boiler with an external furnace, where the external furnace replaces the burner. The external furnace 1 and the WNS boiler 2 work together to produce high-temperature steam. Furthermore, the external furnace 1 and the WNS boiler 2 are independent of each other, and the assembly and transportation of the WNS boiler 2 and the external furnace 1 are relatively convenient.

[0028] In one possible implementation, the heat exchange structure includes a third water tank 14, a first water tank 15, and a second water tank 16 fixedly mounted on the outer furnace chamber 1. The third water tank 14 is fixedly connected to and communicates with the top of the furnace chamber 21 via a steam pipe 5. The third water tank 14 is also connected to the first water tank 15 and the second water tank 16. The first water tank 15 and the second water tank 16 are fixedly connected to and communicate with the bottom of the furnace chamber 21 via a water-cooling pipe 6. The first water tank 15 is fixedly connected to and communicates with the second water tank 16 via several cooling pipes 17. A combustion chamber 12 is formed between the outer furnace chamber 1 and the several cooling pipes 17, and the third water tank 14, the first water tank 15, and the second water tank 16 are located within the combustion chamber 12. The several cooling pipes 17 are evenly spaced. In this embodiment, the cooling pipes 17 are V-shaped to further facilitate material falling onto the cooling pipes 17 for heat exchange. Cooling water in the furnace chamber 21 enters the first water tank 15, the second water tank 16, several cooling pipes 17, and the third water tank 14 through water-cooled pipes 6. Biomass material falls onto the cooling pipes 17 through the feed inlet 11 for high-temperature combustion. The energy generated by the combustion exchanges heat with the cooling water in the first water tank 15, the second water tank 16, the cooling pipes 17, and the third water tank 14, causing the cooling water to vaporize and form a high-temperature steam-water mixture. This high-temperature steam-water mixture in the third water tank 14 enters the top of the furnace chamber 21 through steam pipe 5. The material does not fall between the two cooling pipes 17; generally, the ash produced after the material is completely burned falls between the two cooling pipes 17 to the outside of the furnace chamber 1.

[0029] In one possible implementation, the third water tank 14 is fixedly installed at the top of the outer furnace 1, while the first water tank 15 and the second water tank 16 are fixedly installed at the bottom of the outer furnace 1 and arranged opposite to each other. The third water tank 14 is fixedly connected to and communicates with the first water tank 15 through a plurality of first gas pipes 18, and the third water tank 14 is fixedly connected to and communicates with the second water tank 16 through a plurality of second gas pipes 19. The plurality of first gas pipes 18 and second gas pipes 19 are fixedly installed on the side wall of the combustion chamber 12 of the outer furnace 1, and are evenly spaced. Specifically, cooling water enters the third water tank 14 through the first gas pipes 18 and the second gas pipes 19.

[0030] In one possible implementation, the steam-water separator 22 is fixedly installed at the top of the furnace chamber 21. The steam-water separator 22 is equipped with an exhaust pipe 221 extending to the outside of the furnace chamber 21, an air inlet (not shown in the figure) located inside the furnace chamber 21, and a drain pipe 222. The drain pipe 222 is located above the water inlet, and the water inlet is located above the second flue pipe 26. The water inlet of the WNS boiler 2 is fixedly connected to the water inlet pipe 23, and the water inlet pipe 23 is located outside the WNS boiler 2. In this embodiment, the steam-water separator 22 is an orifice plate type steam-water separator; its specific structure will not be described in detail here. The high-temperature steam-water mixture in the third water tank 14 enters the top of the furnace chamber 21 through the steam pipe 5. Then, the high-temperature steam-water mixture enters the steam-water separator 22 through the air inlet. Inside the steam-water separator 22, the high-temperature steam-water mixture is separated into high-temperature steam and liquid. The high-temperature steam is discharged outside the furnace chamber 21 through the exhaust pipe 221 for further use, and the liquid returns to the furnace chamber 21 through the drain pipe 222 for recycling.

[0031] External cooling water is continuously supplied to the furnace chamber 21 of the WNS boiler 2 through the water inlet pipe 23 and the water inlet. There are two water inlet pipes 23 and water inlets.

[0032] In one possible implementation, an ash hopper 7 is provided outside the external furnace chamber 1, located below several cooling pipes 17. Ash and slag produced after the material burns out fall into the ash hopper 7 between two cooling pipes 17, allowing for periodic cleaning of the ash and slag in the ash hopper 7. Rollers are rotatably mounted on the ash hopper 7 to further facilitate ash removal.

[0033] In one possible implementation, the flue gas structure includes a main flue pipe 24 fixedly disposed within the furnace chamber 21, and several first flue pipes 25 and second flue pipes 26. One end of the main flue pipe 24 is connected to the flue gas duct 13, and the other end of the main flue pipe 24 is fixedly connected to and communicates with one end of each of the several first flue pipes 25. The WNS boiler 2 is provided with a flue gas inlet 27 and a flue gas outlet 28. The other ends of the several first flue pipes 25 are connected to and communicate with the flue gas inlet 27, and the two ends of the several second flue pipes 26 are fixedly connected to and communicate with the flue gas inlet 27 and the flue gas outlet 28, respectively. The main flue pipe 24 and the several first flue pipes 25 and second flue pipes 26 realize three-pass heat exchange of high-temperature flue gas. The high-temperature flue gas generated by the combustion of materials enters the main flue pipe 24 through the flue gas duct 13, and the high-temperature flue gas in the main flue pipe 24 is then discharged to the outside of the WNS boiler 2 through the first flue pipes 25, the second flue pipes 26 and the flue gas outlet 28. The high-temperature flue gas in the main flue 24, the first flue 25 and the second flue 26 exchanges heat with the cooling water in the furnace cavity 21 and becomes low-temperature flue gas, which is finally discharged through the flue gas outlet 28.

[0034] Preferably, the main flue duct 24 includes a corrugated tube and a square tube that are fixedly connected and communicate with each other. The corrugated tube and the square tube are fixedly installed in the furnace cavity 21. One end of the corrugated tube communicates with the flue gas duct 13, and one end of the square tube is fixedly connected and communicates with one end of a plurality of first flue ducts 25. A connecting pipe is provided at one end of the square tube, and the connecting pipe is locked in the furnace cavity 21.

[0035] As one possible implementation, it also includes an economizer 3 and a condenser 4 fixedly installed outside the WNS boiler 2 and communicating with each other. The economizer 3 and condenser 4 are locked to the working ground by external columns. The economizer 3 is located on the side of the WNS boiler 2 away from the external furnace 1. The economizer 3 is detachably connected to the WNS boiler 2, and the flue gas outlet 28 is connected to the economizer 3. The structure of the economizer 3 and condenser 4 is prior art and will not be described in detail here. The low-temperature flue gas passes through the flue gas outlet 28 and then through the economizer 3 and condenser 4 for heat exchange again. The low-temperature flue gas is finally converted into liquid and discharged through the condenser 4, further recovering the heat from the low-temperature flue gas. The economizer 3 and condenser 4 are also detachably connected by bolts and nuts. The external furnace 1, the WNS boiler 2, and the economizer 3 and condenser 4 are independent of each other, and the assembly and transportation of the WNS boiler 2, the external furnace 1, and the economizer 3 and condenser 4 are relatively convenient.

[0036] The external cooling water first enters the economizer 3, where it exchanges heat with the low-temperature flue gas. Then, the cooling water enters the furnace chamber 21 of the WNS boiler 2 through the inlet pipe 23 and the inlet.

[0037] In one possible implementation, a third connecting plate 31 is fixedly installed on the economizer 3, and a fourth connecting plate 9 is fixedly installed on the exterior of the WNS boiler 2 by bolts. The third connecting plate 31 and the fourth connecting plate 9 are screwed together. The third connecting plate 31 and the fourth connecting plate 9 are fixedly connected by bolts and nuts, allowing the flue gas outlet 28 to communicate with the economizer 3. The economizer 3 and the WNS boiler 2 can be disassembled and connected by assembling and disassembling the third connecting plate 31 and the fourth connecting plate 9.

[0038] In one possible implementation, a first connecting plate 131 is fixedly installed on the flue gas duct 13, and a second connecting plate 8 is fixedly installed on the outside of the WNS boiler 2 by bolts. The first connecting plate 131 and the second connecting plate 8 are screwed together. The first connecting plate 131 and the second connecting plate 8 are fixedly connected by bolts and nuts, enabling the main flue pipe 24 to communicate with the flue gas duct 13. By disassembling and assembling the first connecting plate 131 and the second connecting plate 8, the external furnace 1 and the WNS boiler 2 can be disassembled and connected.

[0039] The embodiments described above are merely preferred embodiments of this utility model and are only used to explain this utility model. They are not intended to limit the scope of implementation of this utility model. For those skilled in the art, other implementation methods can be easily made by substitution or modification based on the technical content disclosed in this specification. Therefore, all changes and improvements made to the principles and process conditions of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A WNS boiler with an external furnace, characterized in that, The system includes a detachable WNS boiler (2) and an external furnace (1). The WNS boiler (2) is provided with a water inlet and a furnace chamber (21). A steam-water separator (22) and a flue gas structure are fixedly installed in the furnace chamber (21) of the WNS boiler (2). The external furnace (1) is provided with a feed inlet (11), a combustion chamber (12), and a flue gas pipe (13). A heat exchange structure is fixedly installed in the combustion chamber (12) of the external furnace (1). The flue gas pipe (13) is detachably connected to the WNS boiler (2) and is connected to the flue gas structure. The heat exchange structure is fixedly connected to and connected to the top and bottom of the furnace chamber (21) through a steam pipe (5) and a water-cooled pipe (6), respectively.

2. The WNS boiler with an external furnace according to claim 1, characterized in that, The heat exchange structure includes a third water tank (14), a first water tank (15), and a second water tank (16) fixedly installed on the external furnace (1). The third water tank (14) is fixedly connected to and communicates with the top of the furnace cavity (21) through a steam pipe (5). The third water tank (14) is connected to both the first water tank (15) and the second water tank (16). The first water tank (15) and the second water tank (16) are fixedly connected to and communicate with the bottom of the furnace cavity (21) through a water-cooling pipe (6). The first water tank (15) is fixedly connected to and communicates with the second water tank (16) through several cooling pipes (17). A combustion chamber (12) is formed between the external furnace (1) and the several cooling pipes (17), and the third water tank (14), the first water tank (15), and the second water tank (16) are located in the combustion chamber (12). The several cooling pipes (17) are evenly spaced.

3. The WNS boiler with an external furnace according to claim 2, characterized in that, The third water tank (14) is fixedly installed on the top of the outer furnace (1), and the first water tank (15) and the second water tank (16) are fixedly installed on the bottom of the outer furnace (1) and are arranged opposite to each other. The third water tank (14) is fixedly connected to the first water tank (15) through a number of first gas pipes (18) and communicates with it. The third water tank (14) is fixedly connected to the second water tank (16) through a number of second gas pipes (19) and communicates with it. The number of first gas pipes (18) and second gas pipes (19) are fixedly installed on the side wall of the combustion chamber (12) of the outer furnace (1). The number of first gas pipes (18) and second gas pipes (19) are evenly arranged at equal intervals.

4. The WNS boiler with an external furnace according to claim 2, characterized in that, The steam-water separator (22) is fixedly installed on the top of the furnace cavity (21). The steam-water separator (22) is provided with an exhaust pipe (221) extending to the outside of the furnace cavity (21) and an air inlet and a drain pipe (222) located inside the furnace cavity (21). The drain pipe (222) is located above the water inlet. The water inlet is located above the second flue pipe (26). The water inlet of the WNS boiler (2) is fixedly connected to the water inlet pipe (23) and the water inlet pipe (23) is located outside the WNS boiler (2).

5. The WNS boiler with an external furnace according to claim 2, characterized in that, An ash hopper (7) is provided outside the external furnace chamber (1), and the ash hopper (7) is located below several cooling pipes (17).

6. The WNS boiler with an external furnace according to claim 1, characterized in that, The flue gas structure includes a main flue pipe (24) fixedly installed in the furnace cavity (21) and several first flue pipes (25) and second flue pipes (26). One end of the main flue pipe (24) is connected to the flue gas pipe (13), and the other end of the main flue pipe (24) is fixedly connected to and connected to one end of several first flue pipes (25). The WNS boiler (2) is provided with a flue gas inlet (27) and a flue gas outlet (28). The other end of several first flue pipes (25) is connected to and connected to the flue gas inlet (27), and the two ends of several second flue pipes (26) are fixedly connected to and connected to the flue gas inlet (27) and the flue gas outlet (28), respectively.

7. The WNS boiler with an external furnace according to claim 6, characterized in that, It also includes an economizer (3) and a condenser (4) that are fixedly installed outside the WNS boiler (2) and communicate with each other. The economizer (3) is located on the side of the WNS boiler (2) away from the external furnace (1). The economizer (3) is detached from the WNS boiler (2) and the flue gas outlet (28) communicates with the economizer (3).

8. The WNS boiler with an external furnace according to claim 7, characterized in that, A third connecting plate (31) is fixedly installed on the economizer (3), and a fourth connecting plate (9) is fixedly installed on the outside of the WNS boiler (2). The third connecting plate (31) and the fourth connecting plate (9) are screwed together.

9. The WNS boiler with an external furnace according to claim 6, characterized in that, A first connecting plate (131) is fixedly installed on the flue gas duct (13), and a second connecting plate (8) is fixedly installed on the outside of the WNS boiler (2). The first connecting plate (131) and the second connecting plate (8) are screwed together.

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