Hydrogen-burning gas backflow stable-burning premixing condensing boiler

Abstract

The utility model discloses a hydrogen-burning fuel gas backflow stable-burning premixing condensing boiler which comprises a lower box body and an upper box body, a water cooling wall is communicated between the lower box body and the upper box body, a plurality of water cooling pipes I are arranged in an air inlet, a flow guide frame body is fixedly connected outside the water cooling pipes I, a plurality of water cooling pipes II are arranged on the downstream of the water cooling pipes I, and the water cooling pipes II are communicated with the upper box body. The second water-cooling pipes are located on the downstream of the first gas channel, second gas channels are formed between the second water-cooling pipes and the adjacent flow guide frame bodies, third gas channels are formed between every two adjacent second water-cooling pipes, a plurality of third water-cooling pipes are arranged on the downstream of the second water-cooling pipes, and a plurality of fourth water-cooling pipes are arranged on the downstream of the third water-cooling pipes. A fin is fixedly connected between the water-cooling pipe II and the water-cooling pipe III, and a water-cooling pipe group I, a water-cooling pipe group II and a water-cooling smoke barrier wall are sequentially arranged in the tapered hearth from upstream to downstream. According to the burner, flame combustion is more stable, meanwhile, the high-temperature flame is cooled, tempering is prevented, and generation of nitric oxide is reduced.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, and in particular to a hydrogen-fueled gas recirculation stable combustion premixed condensing boiler. Background Technology

[0002] With increasing global emphasis on environmental protection and sustainable development, and growing restrictions on traditional fossil fuel boilers, hydrogen-fired gas boilers have gained increasing attention as a clean and low-carbon alternative, becoming a focus of product development in the boiler industry. Hydrogen and natural gas, as important clean energy sources, possess characteristics such as being green, low-carbon, and clean. However, existing gas boilers suffer from drawbacks such as unstable combustion surfaces, incomplete combustion leading to high nitrogen oxide emissions, low hydrogen density causing easy deposition in the furnace, poor water circulation, and low boiler thermal efficiency.

[0003] To address these issues, a hydrogen-fueled gas recirculation stable combustion premixed condensing boiler is provided. Utility Model Content

[0004] The purpose of this invention is to provide a hydrogen-fueled gas recirculation stable combustion premixed condensing boiler to solve the problems existing in the prior art. It can form a high-speed, low-pressure, and stable combustion surface, enabling complete combustion, achieving low-NOx combustion, reducing nitrogen oxide emissions, and thus improving boiler thermal efficiency.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a hydrogen-fueled gas recirculation stable combustion premixed condensing boiler, comprising:

[0006] The lower chamber and the upper chamber are connected by a water-cooled wall. The interior of the water-cooled wall is a tapered furnace. An air inlet and a flue gas outlet are provided on the water-cooled wall. Several water-cooled pipes I are provided in the air inlet. A flow guide frame is fixedly connected to the outside of the water-cooled pipes I. A first gas channel is formed between two adjacent flow guide frames. A heat exchange mechanism is provided in the upper chamber.

[0007] A plurality of water-cooled pipes II are provided downstream of the water-cooled pipe I. The water-cooled pipes II are located downstream of the first gas channel. A second gas channel is formed between the water-cooled pipe II and the adjacent flow guide frame. A third gas channel is formed between two adjacent water-cooled pipes II. The first gas channel is connected to the second gas channel, and the second gas channel is connected to the third gas channel.

[0008] A plurality of water-cooled pipes III are provided downstream of water-cooled pipe II, and a plurality of water-cooled pipes IV are provided downstream of water-cooled pipe III. A rib is fixedly connected between water-cooled pipe II and water-cooled pipe III, and a rib is fixedly connected between water-cooled pipe III and water-cooled pipe IV. An independent combustion space is formed between the ribs on two adjacent water-cooled pipes III, and the third gas channel is connected to the independent combustion space.

[0009] The gradually narrowing furnace is provided with water-cooled pipe assembly I, water-cooled pipe assembly II, and water-cooled smoke baffle wall arranged sequentially from upstream to downstream. Water-cooled pipe assembly I is located downstream of water-cooled pipe assembly II. Both ends of water-cooled pipe assembly I are connected to the upper box and the lower box, respectively. Both ends of water-cooled pipe assembly II are connected to the upper box and the lower box, respectively. Both ends of water-cooled smoke baffle wall are connected to the upper box and the lower box, respectively.

[0010] The lower tank and the upper tank are connected by a left downcomer pipe and a right downcomer pipe. The two ends of the left downcomer pipe are connected to the lower tank and the upper tank respectively, and the two ends of the right downcomer pipe are connected to the lower tank and the upper tank respectively. The lower tank is connected to a water supply pipe.

[0011] Preferably, the flow guide frame includes a sealing plate, a V-shaped plate, and two flow guide plates. The flow guide plates are fixedly connected between the sealing plate and the V-shaped plate. The sealing plate is located upstream. The sealing plate, the V-shaped plate, and the flow guide plates are all fixedly connected to the water-cooling pipe I. A first gas channel is formed between two adjacent flow guide plates, and a second gas channel is formed between the water-cooling pipe II and the V-shaped plate.

[0012] Preferably, the heat exchange mechanism includes a plurality of condenser tubes, and a water collection chamber and a water outlet chamber are respectively provided at both ends of the upper housing. The water collection chamber and the water outlet chamber are connected through the plurality of condenser tubes. The water collection chamber is connected to a water inlet pipe, and the water outlet chamber is connected to a water outlet pipe.

[0013] This utility model discloses the following technical effects: In this device, hydrogen and premixed gas pass through the first gas channel between two guide frames, then enter the second gas channel between water-cooled pipe II and the flow frame, and then enter the third gas channel formed between two adjacent water-cooled pipes II, where they are ignited. After passing through an independent combustion space, a stable flame is formed. Water-cooled pipes I, II, III, and IV absorb some heat, and the high-temperature flue gas and high-temperature flame generated by combustion move downstream while burning, and are distributed in the water-cooled pipe group I and water-cooled... Combustion on the surface of tube assembly II generates flames that exchange heat with the high-temperature flue gas, which laterally impacts water-cooled tube assemblies I and II. This increases the heat exchange area, lowers the furnace temperature, and reduces the gas velocity, thus achieving stable combustion and significantly reducing nitrogen oxide formation. The flue gas continues downstream to the converging furnace tail, where it exchanges heat with the water-cooled baffle wall and is then cooled before being discharged from the boiler through the flue gas outlet. This process controls combustion temperature and oxide concentration, thereby reducing nitrogen oxide emissions and saving energy, completing the boiler combustion heat exchange process. This invention makes flame combustion more stable and cools the high-temperature flame, preventing backfire and reducing nitrogen oxide formation. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the hydrogen-fueled gas recirculation stable combustion premixed condensing boiler of this utility model;

[0016] Figure 2 This is the left view of the present invention;

[0017] Figure 3 for Figure 1 Sectional view of AA;

[0018] Figure 4 for Figure 3 Enlarged view of point a in the middle;

[0019] The components are as follows: 1. Water-cooled wall; 2. Lower housing; 3. Water-cooled smoke baffle wall; 4. Flue gas outlet; 5. Water collection chamber; 6. Water inlet pipe; 7. Condenser pipe; 8. Water outlet pipe; 9. Water outlet chamber; 10. Upper housing; 11. Left downcomer pipe; 12. Right downcomer pipe; 13. Rib; 14. Water supply pipe; 15. Water-cooled pipe assembly I; 16. Combustion surface; 17. Water-cooled pipe assembly II; 18. Burner; 19. Water-cooled pipe III; 20. Water-cooled pipe IV; 21. Sealing plate; 22. Baffle plate; 23. Water-cooled pipe I; 24. Water-cooled pipe II; 25. V-shaped plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Reference Figure 1-4 This utility model provides a hydrogen-fired gas recirculation stable combustion premixed condensing boiler, comprising:

[0023] The lower chamber 2 and the upper chamber 10 are connected by a water-cooled wall 1. The interior of the water-cooled wall 1 is a gradually narrowing furnace. The water-cooled wall 1 is provided with an air inlet and a flue gas outlet 4. Several water-cooled pipes I23 are provided in the air inlet. A flow guide frame is fixedly connected to the outside of the water-cooled pipes I23. A first gas channel is formed between two adjacent flow guide frames. A heat exchange mechanism is provided inside the upper chamber 10.

[0024] Downstream of water-cooled pipe I 23, there are several water-cooled pipes II 24. Water-cooled pipes II 24 are located downstream of the first gas channel. A second gas channel is formed between water-cooled pipes II 24 and the adjacent guide frame. A third gas channel is formed between two adjacent water-cooled pipes II 24. The first gas channel and the second gas channel are connected. The second gas channel and the third gas channel are connected.

[0025] Downstream of water-cooled pipe II 24, there are several water-cooled pipes III 19, and downstream of water-cooled pipe III 19, there are several water-cooled pipes IV 20. A rib 13 is fixedly connected between water-cooled pipe II 24 and water-cooled pipe III 19, and a rib 13 is fixedly connected between water-cooled pipe III 19 and water-cooled pipe IV 20. An independent combustion space is formed between the ribs 13 on two adjacent water-cooled pipes III 19, and the third channel is connected to the independent combustion space.

[0026] The gradually narrowing furnace is provided with water-cooled pipe assembly I15, water-cooled pipe assembly II17 and water-cooled smoke baffle 3 arranged sequentially from upstream to downstream. Water-cooled pipe assembly I15 is located downstream of water-cooled pipe IV20. Both ends of water-cooled pipe assembly I15 are connected to the upper box 10 and the lower box 2 respectively. Both ends of water-cooled pipe assembly II17 are connected to the upper box 10 and the lower box 2 respectively. Both ends of water-cooled smoke baffle 3 are connected to the upper box 10 and the lower box 2 respectively.

[0027] The lower tank 2 and the upper tank 10 are also connected by a left downcomer pipe 11 and a right downcomer pipe 12. The two ends of the left downcomer pipe 11 are connected to the lower tank 2 and the upper tank 10 respectively, and the two ends of the right downcomer pipe 12 are connected to the lower tank 2 and the upper tank 10 respectively. The lower tank 2 is connected to a water supply pipe 14.

[0028] In this device, both the lower chamber 2 and the upper chamber 10 are filled with water. Hydrogen and premixed gas are injected into the air inlet and ignited by an ignition device. The hydrogen and premixed gas pass through the first gas channel between the two guide frames, then enter the second gas channel between the water-cooled pipe II 24 and the flow frame, and then enter the third gas channel formed between two adjacent water-cooled pipes II, where they are ignited. After passing through an independent combustion space, a stable flame is formed. Water-cooled pipes I 23, II 24, III 19, and IV 20 absorb some heat, and the high-temperature flue gas and high-temperature flame generated by combustion burn downwards. The flue gas moves and burns on the surfaces of water-cooled tube group I15 and water-cooled tube group II17. The resulting flames and high-temperature flue gas exchange heat with each other by laterally scouring water-cooled tube group I15 and water-cooled tube group II17, increasing the heat exchange area, reducing the furnace temperature, and also reducing the gas flow rate to achieve stable combustion. This also greatly reduces the generation of nitrogen oxides. The flue gas continues to move downstream to the tail end of the converging furnace, where it exchanges heat with the water-cooled baffle wall 3 and is then cooled before being discharged from the boiler through the flue gas outlet 4. This process controls the combustion temperature and oxide concentration, thereby reducing nitrogen oxide emissions and saving energy, thus completing the boiler combustion heat exchange process.

[0029] In this embodiment, water-cooled pipe I 23, water-cooled pipe II 24, water-cooled pipe III 19, and water-cooled pipe IV 20 are all arranged in a row.

[0030] Boiler water circulation: Water enters the lower chamber 2 from the feed pipe 14 and flows upward into water-cooled pipe I 23, water-cooled pipe II 24, water-cooled pipe III 19, water-cooled pipe IV 20, water-cooled pipe group I 15, water-cooled pipe group II 17 and water-cooled flue wall 3, where heat exchange occurs. The water generates steam in the heated surface and flows upward. The generated steam exchanges heat with the heat exchange mechanism in the upper chamber 10. After heat exchange, condensation occurs and returns to the lower chamber 2 through the left downcomer 11 and right downcomer 12, where it is redistributed and circulated. Water that has not been completely evaporated enters the upper chamber 10 directly and returns to the lower chamber 2 through the left downcomer 11 and right downcomer 12 for redistribution and circulation, thus completing the water circulation of the entire boiler.

[0031] The design is further optimized so that the flow guide frame includes a sealing plate 21, a V-shaped plate 25 and two flow guide plates 22. The flow guide plates 22 are fixedly connected between the sealing plate 21 and the V-shaped plate 25. The sealing plate 21 is located upstream. The sealing plate 21, the V-shaped plate 25 and the flow guide plates 22 are all fixedly connected to the water cooling pipe I 23. A first gas channel is formed between two adjacent flow guide plates 22 and a second gas channel is formed between the water cooling pipe II and the V-shaped plate 25.

[0032] The sealing plate 21 is used to allow the premixed gas to flow on both sides. On two adjacent water-cooled pipes I 23, a first gas channel is formed between two adjacent guide plates 22. Several first gas channels separate the premixed gas into multiple gas flows. The premixed gas enters the first gas channel and then enters the second gas channel.

[0033] The scheme is further optimized. The heat exchange mechanism includes several condenser pipes 7. The upper box 10 has a water collection chamber 5 and a water outlet chamber 9 at both ends. The water collection chamber 5 and the water outlet chamber 9 are connected by several condenser pipes 7. The water collection chamber 5 is connected to the water inlet pipe 6, and the water outlet chamber 9 is connected to the water outlet pipe 8.

[0034] Water generates steam in the heated surface and flows upward. The generated steam exchanges heat with the condenser tube 7 in the upper chamber 10 and then condenses, returning to the lower chamber 2 through the left downcomer tube 11 and the right downcomer tube 12, where it is redistributed and circulated.

[0035] The return water from the external network enters the water collection chamber 5 on the left side of the upper casing 10 through the inlet pipe 6, flows into the condenser pipe 7, flows into the outlet chamber 9 on the right side after heat exchange, and then leaves the boiler through the outlet pipe 8.

[0036] In this device, water-cooled pipe row I 19, water-cooled pipe II 24, water-cooled pipe III 19, water-cooled pipe IV 20, sealing plate 21, guide plate 22 and V-shaped plate 25 constitute the combustion surface 16 of burner 18.

[0037] Advantages of this boiler:

[0038] 1. The arrangement of the left downcomer 11, right downcomer 12, water-cooled pipe I 23, water-cooled pipe II 24, water-cooled pipe III 19, water-cooled pipe IV 20, water-cooled pipe group I 15, water-cooled pipe group II 17 and water-cooled smoke baffle 3 makes the boiler's support structure more stable.

[0039] 2. The structural design without a boiler drum and combustion surface can reduce the overall size of the boiler, making it more compact, reducing the floor space required, and saving costs.

[0040] 3. The design of the water collection chamber 5, the water outlet chamber 9, and the condenser tube 7 increases the heat exchange area and improves the boiler's thermal efficiency.

[0041] 4. The design of a tapered furnace can increase the flow rate of combustion gases, creating a reflux zone at the furnace inlet, making combustion more stable and complete, thereby improving the boiler's thermal efficiency.

[0042] 5. The design of water-cooled tube I 23, water-cooled tube II 24, water-cooled tube III 19, water-cooled tube IV 20, water-cooled tube group I 15, water-cooled tube group II 17 and water-cooled smoke baffle 3 in the furnace can form surface combustion, increase the heat exchange area, reduce the furnace temperature, thereby reducing the generation of nitrogen oxides, making combustion more complete and improving the thermal efficiency of the boiler.

[0043] 6. The boiler structure design simplifies the flue gas flow into a straight line, which makes it less prone to flue gas deposition and solves the problem that hydrogen, being light and low in density, is prone to deposition in the furnace.

[0044] 7. The design of the water-cooled wall 1 ensures a tight seal for the boiler and improves its thermal efficiency.

[0045] 8. The structure of the guide plate and the V-shaped plate constitutes a V-shaped bluff body, and the water-cooled pipe II24 constitutes an annular bluff body. After the premixed combustible gas flows through the bluff body, it forms a cylindrical flame. At the same time, a recirculation zone is formed at the tail of the bluff body to stabilize the flame.

[0046] 9. Water-cooled tubes II24, III19, and IV20 are connected by fins 13 to form an independent combustion space, which makes the flame combustion more stable and cools the high-temperature flame, prevents backfire, and reduces the generation of nitrogen oxides.

[0047] Currently available combustible gas fuels generally suffer from unstable combustion in the furnace, leading to easy flameout, incomplete combustion, high flue gas outlet temperature, and the low density of hydrogen, which easily deposits in the furnace, resulting in high nitrogen oxide emission concentrations and low boiler thermal efficiency. To address these shortcomings, this boiler overcomes the deficiencies of existing technologies by providing a hydrogen-fueled, gas-fired, stable-combustion, premixed condensing boiler. Its structural design creates a high-speed, low-pressure, and stable combustion surface, ensuring complete combustion, achieving low-NOx combustion, reducing nitrogen oxide emissions, and thus improving boiler thermal efficiency. It also solves the problem of hydrogen's low density and easy deposit in the furnace, and incorporates a high-strength support structure, ensuring structural safety and stability, eliminating the need for steel frame support, reducing footprint, and minimizing steel consumption.

[0048] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A hydrogen-fired gas recirculation stable combustion premixed condensing boiler, characterized in that, include: The lower chamber (2) and the upper chamber (10) are connected by a water-cooled wall (1). The interior of the water-cooled wall (1) is a tapered furnace. The water-cooled wall (1) is provided with an air inlet and a flue gas outlet (4). Several water-cooled pipes I (23) are provided in the air inlet. A flow guide frame is fixedly connected to the outside of the water-cooled pipes I (23). A first gas channel is formed between two adjacent flow guide frames, and a heat exchange mechanism is provided inside the upper box (10); A plurality of water-cooled pipes II (24) are provided downstream of the water-cooled pipe I (23). The water-cooled pipes II (24) are located downstream of the first gas channel. A second gas channel is formed between the water-cooled pipes II (24) and the adjacent flow guide frame. A third gas channel is formed between two adjacent water-cooled pipes II (24). The first gas channel is connected to the second gas channel, and the second gas channel is connected to the third gas channel. Downstream of the water-cooled pipe II (24), a plurality of water-cooled pipes III (19) are provided, and downstream of the water-cooled pipes III (19), a plurality of water-cooled pipes IV (20) are provided. A rib (13) is fixedly connected between the water-cooled pipe II (24) and the water-cooled pipe III (19), and the rib (13) is fixedly connected between the water-cooled pipe III (19) and the water-cooled pipe IV (20). An independent combustion space is formed between the ribs (13) on two adjacent water-cooled pipes III (19), and the third gas channel is connected to the independent combustion space. The gradually narrowing furnace is provided with water-cooled pipe assembly I (15), water-cooled pipe assembly II (17) and water-cooled smoke baffle (3) arranged sequentially from upstream to downstream. Water-cooled pipe assembly I (15) is located downstream of water-cooled pipe IV (20). Both ends of water-cooled pipe assembly I (15) are connected to the upper box (10) and the lower box (2) respectively. Both ends of water-cooled pipe assembly II (17) are connected to the upper box (10) and the lower box (2) respectively. Both ends of water-cooled smoke baffle (3) are connected to the upper box (10) and the lower box (2) respectively. The lower housing (2) and the upper housing (10) are also connected by a left downcomer pipe (11) and a right downcomer pipe (12). The two ends of the left downcomer pipe (11) are connected to the lower housing (2) and the upper housing (10) respectively. The two ends of the right downcomer pipe (12) are connected to the lower housing (2) and the upper housing (10) respectively. The lower housing (2) is connected to a water supply pipe (14).

2. The hydrogen-fired gas recirculation stable combustion premixed condensing boiler according to claim 1, characterized in that: The flow guide frame includes a sealing plate (21), a V-shaped plate (25), and two flow guide plates (22). The flow guide plates (22) are fixedly connected between the sealing plate (21) and the V-shaped plate (25). The sealing plate (21) is located upstream. The sealing plate (21), the V-shaped plate (25), and the flow guide plates (22) are all fixedly connected to the water-cooled pipe I (23). The first gas channel is formed between two adjacent flow guide plates (22), and the second gas channel is formed between the water-cooled pipe II and the V-shaped plate (25).

3. The hydrogen-fired gas recirculation stable combustion premixed condensing boiler according to claim 1, characterized in that: The heat exchange mechanism includes several condenser tubes (7). The upper housing (10) is provided with a water collection chamber (5) and a water outlet chamber (9) at both ends. The water collection chamber (5) and the water outlet chamber (9) are connected through several condenser tubes (7). The water collection chamber (5) is connected to a water inlet pipe (6), and the water outlet chamber (9) is connected to a water outlet pipe (8).

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