Steam generating device

Abstract

The utility model relates to steam generating equipment, and discloses a steam generating device, a first heat exchanger is in a spiral coil pipe shape, the axis of the first heat exchanger is vertically arranged, a burner is provided with an exhaust portion used for exhausting fuel gas, and the exhaust portion is in a columnar shape and is inserted into a space formed by the first heat exchanger in a connected mode. The exhaust portion of the combustor is arranged to be columnar and inserted into the space formed by the spiral of the first heat exchanger, the transverse size of the smoke channel can be effectively reduced, and therefore the occupied area of the steam generation device is reduced. When the combustor works, the open fire section of the exhaust part can directly bake the space formed by the spiral of the first heat exchanger, heating is faster and more uniform, and therefore the heat exchange efficiency of the first heat exchanger is effectively improved. And moreover, as the flue gas channel is relatively short, the heat loss in the flue gas recirculation process is less, and the heat exchange efficiency of the whole group of heat exchangers is further improved.

Description

Technical Field

[0001] The utility model relates to steam generating equipment, in particular to a steam generating device. Background Art

[0002] Utility model application document CN115539929A discloses a mixed-flow superheated steam generator, comprising a burner, a flue gas duct, a heat exchanger, a water inlet pipe, a steam superheat evaporator, and a fan. The steam superheat evaporator comprises a steam collecting tank, a superheat heat exchanger, a water collecting tank, and multiple heat exchange tube bundles. The upper and lower ends of the multiple heat exchange tube bundles are connected to the steam collecting tank and the water collecting tank, respectively. The heat exchanger, multiple heat exchange tube bundles, and superheat heat exchanger are located within the flue gas duct. The steam inlet end of the superheat heat exchanger is connected to the steam collecting tank, and the steam outlet end of the superheat heat exchanger is provided with a steam outlet. The heat exchanger comprises a first heat exchanger and a second heat exchanger.

[0003] When the utility model is working, the pure water in the heat exchanger exchanges heat with the high-temperature flue gas and turns into steam. The steam enters the steam collecting tank. When the high-temperature flue gas flows through the heat exchange tube bundle and the outside of the superheat heat exchanger, the saturated steam in the superheat heat exchanger is heated into superheated steam, so that the superheated steam generated by the utility model has a higher temperature, higher heat, and less energy loss, which has a significant energy-saving effect.

[0004] In the aforementioned steam generator, the first heat exchanger, steam superheat evaporator, and second heat exchanger are arranged transversely within the flue gas duct. In particular, the first heat exchanger comprises a first coil heat exchanger, a second coil heat exchanger, a third coil heat exchanger, and a finned heat exchanger, arranged in tandem. This increases the length of the flue gas duct, thereby increasing the steam generator's footprint. Furthermore, because the burner utilizes a transverse jet heating method, the heat exchange efficiency of the first heat exchanger is high at the front end, while the heat exchange efficiency of the rear end is low. This, coupled with the long length of the flue gas duct itself, further reduces the heat exchange efficiency, thereby lowering the quality of the steam generated by the equipment. Therefore, further improvements are needed. Utility Model Content

[0005] In view of the shortcomings of the prior art, the present invention provides a steam generating device, which can not only reduce the lateral space of the flue gas channel and reduce the floor space of the equipment, but also effectively improve the heat exchange efficiency of the heat exchanger.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] A steam generating device includes a flue gas channel, a burner and a heat exchanger. The heat exchanger includes several heat exchangers arranged in sequence in the flue gas channel. The heat exchanger located at the front end of the flue gas channel is defined as a first heat exchanger. The first heat exchanger is in the shape of a spiral coil and its axis is arranged vertically. The burner has an exhaust portion for discharging fuel gas, and the exhaust portion is columnar and inserted into the space formed by the spiral of the first heat exchanger.

[0008] This solution, by designing the burner's exhaust section into a cylindrical shape and inserting it into the space formed by the first heat exchanger spiral, effectively reduces the lateral volume of the flue gas passageway, thereby reducing the steam generation unit's footprint. When the burner is operating, the open flame section of the exhaust section directly heats the space formed by the first heat exchanger spiral, resulting in faster and more even heating, effectively improving the heat exchange efficiency of the first heat exchanger. Furthermore, the relatively short flue gas passageway reduces heat loss during flue gas recirculation, further enhancing the heat exchange efficiency of the entire heat exchanger.

[0009] Preferably, a steam collecting tank is further included, a water collecting tank is provided below the first heat exchanger, at least one heat exchange tube bundle is provided outside the first heat exchanger, and the upper and lower ends of the heat exchange tube bundle are respectively connected to the steam collecting tank and the water collecting tank.

[0010] The above solution, arranging the heat exchange tube bundle around the first heat exchanger, not only further reduces the horizontal footprint of the steam generator but also enables open flame heating of the heat exchange tube bundle. Compared to traditional flue gas heating, this achieves higher heat exchange efficiency, thereby further improving the steam quality of the steam generator. Since the water-vapor mixture within the first heat exchanger is the area that requires the most heat, while the high-temperature saturated water within the heat exchange tube bundle is the area that requires the least heat, arranging the heat exchange tube bundle outside the first heat exchanger maximizes the use of the open flame heat generated by the burner, further improving heat exchange efficiency.

[0011] Preferably, the steam collecting tank is arranged directly above the first heat exchanger and a passage for the exhaust portion to pass through is provided on the steam collecting tank.

[0012] By adopting the above solution, the steam collecting tank is set directly above the first heat exchanger, which can effectively reduce the length of the heat exchange tube bundle, thereby further reducing the volume of the flue gas channel, and make the entire steam generating device more compact, thereby improving the aesthetics.

[0013] Preferably, a connecting pipe extends above the channel for the exhaust portion to enter the channel and is used to fix the burner.

[0014] Preferably, the burner is fixed to the connecting pipe via a flange.

[0015] The above solution enables the burner to be fixed above the flue gas channel. Compared with the traditional burner installed at the front end of the flue gas channel, the external lateral space of the flue gas channel can be further reduced, thereby reducing transportation costs.

[0016] Preferably, a plurality of exhaust holes for injecting fuel gas are distributed on the outer side wall of the exhaust portion.

[0017] By adopting the above solution, the gas can be evenly ejected from the outer peripheral surface of the exhaust portion, further improving the heating efficiency and uniformity of the burner.

[0018] Preferably, the heat exchanger also includes a second heat exchanger, a third heat exchanger, a fourth heat exchanger and a fifth heat exchanger which are arranged in the flue gas channel and arranged in sequence behind the first heat exchanger. The fifth heat exchanger, the fourth heat exchanger, the third heat exchanger, the first heat exchanger and the second heat exchanger are connected end to end in sequence. The outlet of the second heat exchanger is connected to the inlet of the steam collecting tank, and the inlet of the fifth heat exchanger is connected to a water inlet pipe.

[0019] By adopting the above solution and configuring the heat exchangers into multiple groups of heat exchangers, multi-stage heating of the water circuit of the equipment can be achieved, thereby effectively improving the steam quality.

[0020] Preferably, the steam outlet of the steam collecting tank is connected to a superheat heat exchanger located between adjacent heat exchangers, and the steam outlet of the superheat heat exchanger is connected to a steam outlet.

[0021] By adopting the above solution, the saturated steam in the superheat heat exchanger can be converted into superheated steam after heat exchange with the high-temperature flue gas, and then discharged through the steam outlet, thereby further improving the steam quality.

[0022] Preferably, a smoke exhaust port is provided at the rear end of the smoke channel.

[0023] By adopting the above solution, the smoke exhaust port can help the low-temperature smoke at the rear end of the smoke passage to be discharged smoothly, thereby keeping the smoke passage unobstructed.

[0024] By adopting the above technical solution, the present invention has significant technical effects: the exhaust portion of the burner is configured in a columnar shape and inserted into the space formed by the spiral of the first heat exchanger, which can effectively reduce the lateral volume of the flue gas channel, thereby reducing the footprint of the steam generation device. When the burner is operating, the open flame section of the exhaust portion can directly bake the space formed by the spiral of the first heat exchanger, which not only heats faster but also heats more evenly, thereby effectively improving the heat exchange efficiency of the first heat exchanger. Furthermore, because the flue gas channel is relatively short, the heat loss during the flue gas recirculation process is relatively low, further improving the heat exchange efficiency of the entire heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is a schematic diagram of the structure of this embodiment Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the structure of this embodiment Figure 2 ;

[0027] Figure 3 This is a schematic diagram of the structure of this embodiment Figure 3 ;

[0028] Figure 4 This is a schematic diagram of the structure of this embodiment Figure 4 .

[0029] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. Flue gas duct; 2. Burner; 3. Steam collecting tank; 5. First heat exchanger; 6. Connecting pipe; 7. Exhaust part; 9. Second heat exchanger; 10. Third heat exchanger; 11. Fourth heat exchanger; 12. Fifth heat exchanger; 13. Water inlet pipe; 14. Water collecting tank; 15. Heat exchange tube bundle; 16. Superheat heat exchanger; 17. Steam outlet; 18. Smoke exhaust port; 19. Flange; 20. Water supply device. DETAILED DESCRIPTION

[0030] The present invention is described in further detail below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1 to 4 As shown, a steam generating device disclosed in this embodiment includes a flue gas channel 1, a burner 2, a steam collecting tank 3 and a heat exchanger. Among them, the burner 2 is preferably a premixed ultra-low nitrogen bridge hole surface burner, and the heat exchanger is connected to the steam collecting tank 3 in sequence. The heat exchanger includes a plurality of heat exchangers arranged in sequence in the flue gas channel 1. For the sake of convenience, the heat exchanger located at the front end of the flue gas channel 1 is defined as the first heat exchanger 5. The first heat exchanger 5 is in the shape of a spiral coil and the axis is arranged vertically. The burner 2 has an exhaust portion 7 for discharging the fuel gas, and the exhaust portion 7 is columnar and inserted into the space formed by the spiral of the first heat exchanger 5.

[0032] In order to further improve the steam quality and reduce the horizontal space occupied by the equipment, the steam generating device also includes a steam collecting tank 3, a water collecting tank 14 is arranged below the first heat exchanger 5, and at least one vertical heat exchange tube bundle 15 is arranged on the outside of the first heat exchanger 5, and the upper and lower ends of the heat exchange tube bundle 15 are respectively connected to the steam collecting tank 3 and the water collecting tank 14.

[0033] To reduce the length of heat exchange tube bundle 15 and improve the compactness of the equipment, steam collecting tank 3 is located directly above first heat exchanger 5 and is provided with a passage for exhaust portion 7 to pass through. Extending above this passage is a connecting pipe 6, which allows exhaust portion 7 to enter the passage and is used to secure burner 2. Burner 2 is secured to connecting pipe 6 via flange 19, thereby improving the connection strength and sealing between burner 2 and connecting pipe 6.

[0034] In order to improve the heating efficiency and uniformity of the burner 2, a plurality of exhaust holes for injecting fuel gas are evenly distributed on the outer wall of the exhaust portion 7.

[0035] To further improve the heat exchange efficiency of the heat exchanger, the heat exchanger further includes a second heat exchanger 9, a third heat exchanger 10, a fourth heat exchanger 11, and a fifth heat exchanger 12, which are disposed in the flue gas duct 1 and arranged sequentially behind the first heat exchanger 5. The fifth heat exchanger 12, the fourth heat exchanger 11, the third heat exchanger 10, the first heat exchanger 5, and the second heat exchanger 9 are sequentially connected end to end. The outlet of the second heat exchanger 9 is connected to the inlet of the steam collecting tank 3, and the inlet of the fifth heat exchanger 12 is connected to a water inlet pipe 13. The water inlet pipe 13 is connected to a water supply device 20, such as a water pump.

[0036] To further improve steam quality and reduce the lateral space occupied by the steam generator, the steam outlet of the steam collecting tank 3 is connected to a superheater heat exchanger 16 located between adjacent heat exchangers. The steam outlet of the superheater heat exchanger 16 is connected to a steam outlet 17. Steam outlet 17 is located outside the flue gas channel 1, facilitating the connection of an external steam user (not shown).

[0037] In order to keep the smoke channel 1 unobstructed, a smoke exhaust port 18 is provided at the rear end of the smoke channel 1 .

[0038] The specific working principle is as follows:

[0039] When the steam generating device is in operation, the burner 2 is started, and its exhaust portion 7 generates open flames and high-temperature flue gas through the exhaust holes on the side wall, so as to bake the first heat exchanger 5 and the heat exchange tube bundle 15 at high temperature through the open flame, and at the same time heat all the heat exchangers behind the first heat exchanger 5 through the high-temperature flue gas, and finally the flue gas is discharged from the flue gas channel 1 through the exhaust port 18.

[0040] At the same time, pure water flows through the water supply device 20, sequentially entering the water inlet pipe 13, the fifth heat exchanger 12, the fourth heat exchanger 11, the third heat exchanger 10, the first heat exchanger 5, and the second heat exchanger 9. During this process, the temperature of the water path gradually rises due to the heat exchange between the open flame of the burner 2 and the high-temperature flue gas. When the water temperature reaches the vaporization temperature, the pure water begins to vaporize, forming saturated steam. The saturated steam in the second heat exchanger 9 then flows into the steam collecting tank 3, where a portion of the steam condenses into high-temperature saturated water. This high-temperature saturated water then flows down through the heat exchange tube bundle 15 into the water collecting tank 14. If there is an excess of high-temperature saturated water, it will fill the water collecting tank 14 and the multiple heat exchange tube bundles 15. At this point, the open flame generated by the burner 2 exchanges heat with the high-temperature saturated water in the heat exchange tube bundle 15, causing it to further evaporate and become saturated steam. After leaving the steam collecting tank 3 , the saturated steam enters the superheat heat exchanger 16 . Under the heating of the high-temperature flue gas, the saturated steam becomes superheated steam and is finally discharged through the steam outlet 17 .

Claims

1. A steam generating device comprising a flue gas channel (1), a burner (2) and a heat exchanger, characterized in that: The heat exchanger comprises a plurality of heat exchangers arranged in sequence in a flue gas channel (1), wherein the heat exchanger located at the front end of the flue gas channel (1) is defined as a first heat exchanger (5), the first heat exchanger (5) is in the shape of a spiral coil and its axis is arranged vertically, and the burner (2) has an exhaust portion (7) for exhausting gas, and the exhaust portion (7) is in a columnar shape and is inserted into a space formed by the spiral of the first heat exchanger (5).

2. A steam generating device according to claim 1, characterized in that: The invention also includes a steam collecting tank (3), a water collecting tank (14) is provided below the first heat exchanger (5), at least one heat exchange tube bundle (15) is provided outside the first heat exchanger (5), and the upper and lower ends of the heat exchange tube bundle (15) are respectively connected to the steam collecting tank (3) and the water collecting tank (14).

3. A steam generating device according to claim 2, characterized in that: The steam collecting tank (3) is arranged directly above the first heat exchanger (5), and a passage for the exhaust portion (7) to pass through is provided on the steam collecting tank (3).

4. A steam generating device according to claim 3, characterized in that: A connecting pipe (6) extends above the channel, through which an exhaust portion (7) enters the channel and is used to fix the burner (2).

5. A steam generating device according to claim 4, characterized in that: The burner (2) is fixed to the connecting pipe (6) via a flange (19).

6. A steam generating device according to any one of claims 1 to 5, characterized in that: A plurality of exhaust holes for injecting fuel gas are distributed on the outer side wall of the exhaust portion (7).

7. A steam generating device according to any one of claims 1 to 5, characterized in that: The heat exchanger further comprises a second heat exchanger (9), a third heat exchanger (10), a fourth heat exchanger (11) and a fifth heat exchanger (12) which are arranged in sequence behind the first heat exchanger (5) in the flue gas channel (1); the fifth heat exchanger (12), the fourth heat exchanger (11), the third heat exchanger (10), the first heat exchanger (5) and the second heat exchanger (9) are connected end to end in sequence; the outlet of the second heat exchanger (9) is connected to the inlet of the steam collecting tank (3); and the inlet of the fifth heat exchanger (12) is connected to a water inlet pipe (13).

8. A steam generating device according to any one of claims 2 to 5, characterized in that: The steam outlet of the steam collecting tank (3) is connected to a superheating heat exchanger (16) located between adjacent heat exchangers, and the steam outlet of the superheating heat exchanger (16) is connected to a steam outlet (17).

9. A steam generating device according to any one of claims 1 to 5, characterized in that: A smoke exhaust port (18) is provided at the rear end of the smoke channel (1).

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