A hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle

Abstract

The present invention discloses a hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiant evaporation tube bundle, comprising: a gradually expanding combustion chamber, the gradually expanding combustion chamber comprising a pressure-expanding combustion chamber, a pressure-stabilizing combustion chamber, and a backfire burnout chamber, the pressure-expanding combustion chamber, the pressure-stabilizing combustion chamber, and the backfire burnout chamber being interconnected; an air inlet is formed in the pressure-expanding combustion chamber, a flue gas flow opening is formed in the backfire burnout chamber, a radiant recirculation screen is provided in the flue gas flow opening, and a radiant evaporation tube bundle I and a radiant evaporation tube bundle II are provided in the pressure-stabilizing combustion chamber; a circulation pipe comprises a downcomer I and a downcomer II, one end of the downcomer I being connected to the lower end of the radiant evaporation tube bundle II, the other end of the downcomer I being connected to a boiler drum, one end of the downcomer II being connected to the lower end of the radiant evaporation tube bundle I, and the other end of the downcomer II being connected to the boiler drum. This device can ensure more complete combustion of gas in the pressure-expanding combustion chamber, the pressure-stabilizing combustion chamber, and the backfire burnout chamber, reduce the generation of harmful gases, and improve thermal efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, in particular to a hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle. Background Art

[0002] As society's increasing attention to environmental pollution is driving the gradual elimination of highly polluting fuels and the widespread adoption of more clean energy sources. Natural gas and hydrogen, as important clean energy sources, offer advantages such as being green, low-carbon, and clean. However, current natural gas and hydrogen fuels often suffer from unstable furnace combustion, incomplete combustion, high flue gas outlet temperatures, and high nitrogen oxide (NOx) emissions. Hydrogen's low density also makes it prone to furnace deposition, resulting in low boiler thermal efficiency. To address these issues, a hydrogen-fired gas boiler with a progressively expanding combustion chamber containing a radiant evaporation tube bundle is proposed. Summary of the Invention

[0003] The purpose of the present invention is to provide a hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle, so as to solve the problems existing in the above-mentioned prior art, make the gas in the boiler burn more completely, and improve the thermal efficiency of the boiler.

[0004] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle, comprising:

[0005] A gradually expanding combustion chamber, the gradually expanding combustion chamber comprising a pressure-expanding combustion chamber, a pressure-stabilizing combustion chamber, and a backfire burnout chamber, the pressure-expanding combustion chamber, the pressure-stabilizing combustion chamber, and the backfire burnout chamber being interconnected, an air inlet being provided on the pressure-expanding combustion chamber, a burner being provided on the air inlet, a flue gas flow opening being provided on the backfire burnout chamber, a radiation recirculation screen being provided in the flue gas flow opening, and a radiation evaporation tube bundle I and a radiation evaporation tube bundle II being provided in the pressure-stabilizing combustion chamber;

[0006] A circulation pipe, the circulation pipe includes a downcomer I and a downcomer II, one end of the downcomer I is connected to the lower end of the radiation evaporation tube bundle II, and the other end of the downcomer I is connected to the boiler drum, one end of the downcomer II is connected to the lower end of the radiation evaporation tube bundle I, and the other end of the downcomer II is connected to the boiler drum, the upper end of the radiation evaporation tube bundle II and the upper end of the radiation evaporation tube bundle I are both connected to the boiler drum, and the boiler drum is provided with a water inlet and a steam outlet.

[0007] Preferably, the pressure-expanding combustion chamber includes a furnace front water-cooled wall, an upper header of the radiation evaporation tube bundle I and a lower header of the radiation evaporation tube bundle I, and side water-cooled walls are fixedly connected on both sides of the furnace front water-cooled wall, and the furnace front water-cooled wall is communicated with the upper header of the radiation evaporation tube bundle I and the lower header of the radiation evaporation tube bundle I respectively. The backfire burnout chamber includes a furnace rear water-cooled wall, an upper header of the radiation evaporation tube bundle II and a lower header of the radiation evaporation tube bundle II, and the side water-cooled walls are fixedly connected on both sides of the furnace rear water-cooled wall, and the furnace rear water-cooled wall is communicated with the upper header of the radiation evaporation tube bundle II and the lower header of the radiation evaporation tube bundle II respectively. The pressure-stabilizing combustion chamber includes a first sealing plate. The upper header of the radiation evaporation tube bundle I and the upper header of the radiation evaporation tube bundle II are fixedly connected by the first sealing plate, the upper header of the radiation evaporation tube bundle I and the upper header of the radiation evaporation tube bundle II are both communicated with the boiler drum, the lower header of the radiation evaporation tube bundle I and the lower header of the radiation evaporation tube bundle II are fixedly connected by the first sealing plate, both sides of the first sealing plate are fixedly connected to the side water-cooled wall, both ends of the side water-cooled wall are communicated with the boiler drum, the air inlet is opened on the front water-cooled wall of the furnace, the flue gas flow port is opened on the rear water-cooled wall of the furnace, and the radiation recirculation screen is fixedly connected to the rear water-cooled wall of the furnace through a connecting rod.

[0008] Preferably, the two ends of the radiation evaporation tube bundle I are respectively connected to the upper header of the radiation evaporation tube bundle I and the lower header of the radiation evaporation tube bundle I, the two ends of the radiation evaporation tube bundle II are respectively connected to the upper header of the radiation evaporation tube bundle II and the lower header of the radiation evaporation tube bundle II, the downcomer II is connected to the lower header of the radiation evaporation tube bundle I, the downcomer I is connected to the lower header of the radiation evaporation tube bundle II, and the upper header of the radiation evaporation tube bundle I and the upper header of the radiation evaporation tube bundle II are both connected to the boiler drum.

[0009] Preferably, two second sealing plates are fixedly connected to the rear water-cooled wall of the furnace, and the two second sealing plates are correspondingly arranged above and below. Heat exchange tubes are fixedly connected to both sides of the second sealing plates. The second sealing plate is fixedly connected to a flue gas outlet at one end away from the rear water-cooled wall of the furnace. The flue gas outlet is fixedly connected to the heat exchange tube, and the flue gas flow port is connected to the flue gas outlet. Both ends of the heat exchange tube are connected to the boiler drum, and both ends of the side water-cooled wall are respectively connected to the side water-cooled wall upper header and the side water-cooled wall lower header, and the side water-cooled wall upper header and the side water-cooled wall lower header are both connected to the boiler drum.

[0010] Preferably, the heat exchange tube is a convection serpentine tube, the convection serpentine tube is fixedly connected to the second sealing plate, and both ends of the convection serpentine tube are respectively connected to a convection serpentine tube bundle upper header and a convection serpentine tube bundle lower header.

[0011] Preferably, the upper header of the radiation evaporation tube bundle I and the upper header of the radiation evaporation tube bundle II are connected to the upper header of the side water-cooled wall through the connecting pipe III, the boiler drum is connected to a plurality of gas collecting pipes I, and a plurality of connecting pipes II are connected between the upper header of the side water-cooled wall and the gas collecting pipe I. The upper header of the radiation evaporation tube bundle I and the upper header of the radiation evaporation tube bundle II are connected to the gas collecting pipe I through the connecting pipe I, the upper header of the convection serpentine tube bundle is respectively connected to the upper header of the side water-cooled wall and the gas collecting pipe I, and the lower header of the convection serpentine tube bundle is connected to the lower header of the side water-cooled wall.

[0012] Preferably, the boiler drum is located above the burner, and the boiler drum is connected to a plurality of first front downcomers, the first front downcomers are connected to the side water-cooled wall lower header at one end away from the boiler drum, a first rear downcomer is connected between the side water-cooled wall upper header and the side water-cooled wall lower header, and the convection serpentine tube bundle lower header is connected to the first rear downcomer.

[0013] Preferably, the boiler drum is located above the flue gas outlet, and the boiler drum is connected to a plurality of second rear downcomers, the second rear downcomers are connected to the side water-cooled wall lower header at one end away from the boiler drum, a second front downcomer is connected between the side water-cooled wall upper header and the side water-cooled wall lower header, and the convection serpentine tube bundle lower header is connected to the second rear downcomers.

[0014] Preferably, the boiler drum is connected with a water supply pipe and a third front downcomer, the side water-cooled wall upper header and the side water-cooled wall lower header are connected with a third rear downcomer, the third front downcomer is connected with the side water-cooled wall lower header, the water supply pipe is connected with the convection serpentine tube bundle lower header, the third rear downcomer is connected with the convection serpentine tube bundle lower header, the radiation evaporation tube bundle I upper header is connected with the boiler drum through the return water pipe II, the radiation evaporation tube bundle II upper header is connected with the boiler drum through the return water pipe I, the convection serpentine tube bundle upper header is connected with a water outlet header, and a blocking plate is fixedly connected to the steam outlet.

[0015] Preferably, a water supply header is connected between the first front downcomer and the side water-cooled wall lower header, a return water header is connected to the side water-cooled wall upper header, and the return water header is connected to the boiler drum.

[0016] Preferably, the heat exchange tube is a convection tube bundle, which is fixedly connected to the second sealing plate, one end of the convection tube bundle is connected to the boiler drum, and the other end of the convection tube bundle is connected to a convection tube bundle header, the side water-cooled wall lower header is connected to the convection tube bundle header, a fourth front downcomer is connected between the side water-cooled wall upper header and the side water-cooled wall lower header, the boiler drum is connected to a first header, the convection tube bundle header is connected to a second header, a fourth rear downcomer is connected between the first header and the second header, the upper header of the radiation evaporation tube bundle I and the upper header of the radiation evaporation tube bundle II are connected to the side water-cooled wall upper header through a connecting pipe IV, the boiler drum is connected to a plurality of gas collecting pipes II, a plurality of connecting pipes V are connected between the side water-cooled wall upper header and the gas collecting pipe II, the upper header of the radiation evaporation tube bundle I and the upper header of the radiation evaporation tube bundle II are connected to the gas collecting pipe II through a connecting pipe VI.

[0017] The present invention discloses the following technical effects: In the present invention, flames and flue gas directly flush the radiation evaporation tube bundle I and the radiation evaporation tube bundle II horizontally, and the flames can form surface combustion on the surfaces of the radiation evaporation tube bundles I and II. This not only increases the heat exchange area and improves the thermal efficiency of the boiler, but also significantly reduces the temperature of the furnace, achieves stable combustion, and thus reduces the generation of nitrogen oxides. It also reduces the gas flow rate, thereby achieving stable combustion, which also reduces the generation of nitrogen oxides. The flue gas generated by the combustion is allowed to flow back to the combustion area through the radiation recirculation screen, reducing the maximum temperature of the flame area, thereby reducing the formation of nitrogen oxides, and also allowing the flue gas to better fill the backdraft burnout chamber, reducing the emission of high-temperature flue gas and improving the thermal efficiency of the boiler. The linear flue gas flow process is adopted, which is not easy to produce flue gas deposition, and solves the problem that hydrogen, which is light and has low density, is easily deposited in the furnace. The water in the boiler drum enters the upper end of the radiation evaporation tube bundle II and the radiation evaporation tube bundle I through the downcomer I and downcomer II respectively. After being heated, it returns to the boiler drum, steam is discharged from the steam outlet, and the water remains in the boiler drum for the next cycle. The device can make the gas burn more completely in the pressure-expanding combustion chamber, the pressure-stabilizing combustion chamber and the backfire combustion chamber, reduce the generation of harmful gases, and improve thermal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a structural diagram of Example 1 of a hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle according to the present invention;

[0020] Figure 2 A side view of an embodiment of the present invention;

[0021] Figure 3 This is a structural diagram of embodiment 2 of the present invention;

[0022] Figure 4 This is a structural diagram of embodiment 3 of the present invention;

[0023] Figure 5 This is a structural diagram of embodiment 4 of the present invention;

[0024] Figure 6 This is a side view of an embodiment of the present invention;

[0025] Figure 7 This is a structural diagram of embodiment 5 of the present invention;

[0026] Figure 8 This is a side view of embodiment 5 of the present invention;

[0027] Figure 9 This is a structural diagram of embodiment 6 of the present invention;

[0028] Figure 10 This is a side view of the sixth embodiment of the present invention;

[0029] Among them, 1. Side water-cooled wall lower header; 2. First front downcomer; 3. Furnace front water-cooled wall; 4. Burner; 5. Flame; 6. Boiler drum; 7. Side water-cooled wall upper header; 8. Side water-cooled wall; 9. Diffuser combustion chamber; 10. Connecting pipe III; 11. Radiant evaporator tube bundle I upper header; 12. Radiant evaporator tube bundle II upper header; 13. Furnace rear water-cooled wall; 14. Connecting pipe I; 15. Convection serpentine tube bundle upper header; 16. Gas collecting pipe I; 17. Connecting pipe II; 18. First rear downcomer; 19. Flue gas flow port; 20. Flue gas outlet; 21. Convection serpentine tube; 22. Convection serpentine tube bundle lower header; 23. Radiant recirculation screen; 24. Backdraft burnout chamber; 25. Radiant evaporator tube bundle II; 26. Radiant evaporator tube bundle II lower header; 27. Pressure-stabilizing combustion chamber; 28. First sealing plate ; 29. ​​Lower header of radiation evaporation tube bundle I; 30. Radiation evaporation tube bundle I; 31. Downcomer I; 32. Steam outlet; 33. Water inlet; 34. Downcomer II; 35. Return water header; 36. Water supply header; 201. Second front downcomer; 202. Third front downcomer; 203. Fourth front downcomer; 1001. Return water pipe I; 1002. Connecting pipe IV; 1401. Connecting pipe VI; 1601. Water supply pipe; 1602. Gas collecting pipe II; 1701. Return water pipe II; 1702. Connecting pipe V; 1801. Second rear downcomer; 1802. Third rear downcomer; 1803. Fourth rear downcomer; 2101. Convection tube bundle; 2201. Convection tube bundle header; 2202. First header; 3201. Outlet header; 3501. Second header. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] Reference Figure 1 、 Figure 2

[0034] A hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle, comprising:

[0035] The gradually expanding combustion chamber includes a pressure-expanding combustion chamber 9, a pressure-stabilizing combustion chamber 27 and a backfire burnout chamber 24. The pressure-expanding combustion chamber 9, the pressure-stabilizing combustion chamber 27 and the backfire burnout chamber 24 are interconnected. An air inlet is provided on the pressure-expanding combustion chamber 9, and a burner 4 is provided on the air inlet. A flue gas flow port 19 is provided on the backfire burnout chamber 24, and a radiation reflow screen 23 is provided in the flue gas flow port 19. The pressure-stabilizing combustion chamber 27 is provided with a radiation evaporation tube bundle I30 and a radiation evaporation tube bundle II 25.

[0036] The burner 4 is used to mix combustible gas and air, such as a mixture of natural gas or hydrogen and air. The burner 4 sprays out the mixed gas, and the flame 5 of the mixed gas combustion first reaches the pressure-expanding combustion chamber 9, and then reaches the pressure-stabilizing combustion chamber 27. The flame 5 and the flue gas directly flush the radiation evaporation tube bundle I30 and the radiation evaporation tube bundle II 25 horizontally. This design not only increases the heat exchange area and improves the thermal efficiency of the boiler, but also greatly reduces the temperature of the furnace to achieve stable combustion, thereby reducing the generation of nitrogen oxides. At the same time, it also reduces the gas flow rate to achieve stable combustion, thereby reducing the generation of nitrogen oxides. The radiation reflow screen 23 in the flue gas flow port 19 can block part of the flue gas from being discharged, by allowing the combustion The flue gas generated by combustion flows back to the combustion area, reducing the maximum temperature of the flame area, thereby reducing the formation of nitrogen oxides, and allowing the flue gas to better fill the backfire burnout chamber 24, reducing the emission of high-temperature flue gas, and improving the thermal efficiency of the boiler. The diffuser combustion chamber 9, the pressure-stabilizing combustion chamber 27 and the backfire burnout chamber 24 simplify the flue gas flow into a linear type, which is not easy to produce flue gas deposition. A linear flue gas flow is adopted, and the burner 4 is arranged on the air inlet of the diffuser combustion chamber 9. After the hydrogen is burned in the diffuser combustion chamber 9, it passes through the radiation evaporation tube bundle I30, the radiation evaporation tube bundle II 25 and the backfire burnout chamber 24 in the horizontal direction, and is finally discharged from the flue gas flow port 19, which solves the problem that hydrogen is light and has low density and is easily deposited in the furnace.

[0037] Circulation pipe, the circulation pipe includes a downcomer I31 and a downcomer II34, one end of the downcomer I31 is connected to the lower end of the radiation evaporation tube bundle II25, and the other end of the downcomer I31 is connected to the boiler drum 6, one end of the downcomer II34 is connected to the lower end of the radiation evaporation tube bundle I30, and the other end of the downcomer II34 is connected to the boiler drum 6, the upper end of the radiation evaporation tube bundle II25 and the upper end of the radiation evaporation tube bundle I30 are both connected to the boiler drum 6, and the boiler drum 6 is provided with a water inlet 33 and a steam outlet 32.

[0038] In this embodiment, boiler feed water enters the boiler drum 6 from the water inlet 33. The boiler drum 6 is not filled with water. The lower half of the interior of the boiler drum 6 is a water space, and the upper half is a steam space. The steam outlet 32 ​​is set in the upper half. The water in the boiler drum 6 enters the upper end of the radiation evaporation tube bundle II 25 and the radiation evaporation tube bundle I 30 respectively through the downcomer I 31 and the downcomer II 34. After being heated, it will return to the boiler drum 6, and the steam will be discharged from the steam outlet 32. The water will remain in the boiler drum 6 for the next circulation.

[0039] Further optimization scheme, the pressure-expanding combustion chamber 9 includes the front water-cooled wall 3 of the furnace, the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the side water-cooled wall 8 is fixedly connected on both sides of the front water-cooled wall 3 of the furnace, and the front water-cooled wall 3 is respectively connected with the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the backfire burnout chamber 24 includes the rear water-cooled wall 13 of the furnace, the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the side water-cooled wall 8 is fixedly connected on both sides of the rear water-cooled wall 13 of the furnace, and the rear water-cooled wall 13 is respectively connected with the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the pressure-stabilizing combustion chamber 27 It includes a first sealing plate 28, the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate 28, the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are both connected to the boiler drum 6, the lower header 29 of the radiation evaporation tube bundle I and the lower header 26 of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate 28, both sides of the first sealing plate 28 are fixedly connected to the side water-cooled wall 8, both ends of the side water-cooled wall 8 are connected to the boiler drum 6, the air inlet is opened on the front water-cooled wall 3 of the furnace, the flue gas flow port 19 is opened on the rear water-cooled wall 13 of the furnace, and the radiation recirculation screen 23 is fixedly connected to the rear water-cooled wall 13 of the furnace through a connecting rod.

[0040] Side water-cooled walls 8 are installed on both sides. The front water-cooled wall 3 and the left and right side water-cooled walls 8 form a diffuser combustion chamber 9. The front water-cooled wall 3 and the left and right side water-cooled walls 8 are sealed to maximize heat absorption within the diffuser combustion chamber 9. A first sealing plate 28 connects the upper header 11 of the radiant evaporator tube bundle I and the upper header 12 of the radiant evaporator tube bundle II. A first sealing plate 28 also connects the lower header 29 of the radiant evaporator tube bundle I and the lower header 26 of the radiant evaporator tube bundle II. The upper header 11 of the radiant evaporator tube bundle I, the first sealing plate 28, the upper header 12 of the radiant evaporator tube bundle II, the lower header 29 of the radiant evaporator tube bundle I, the lower header 26 of the radiant evaporator tube bundle II, and the side water-cooled walls 8 on both sides form a pressure-stabilizing combustion chamber 27. The rear water-cooled wall 13 and the left and right side water-cooled walls 8 form a backfire burnout chamber 24.

[0041] The water in the drum 6 enters the lower header 29 of the radiation evaporation tube bundle I through the downcomer II 34, and then enters the front water-cooled wall 3 of the furnace. After being heated in the front water-cooled wall 3, it enters the upper header 11 of the radiation evaporation tube bundle I and flows back to the drum 6. The steam is discharged from the steam outlet 32. The water in the drum 6 enters the water in the lower header 26 of the radiation evaporation tube bundle II through the downcomer I 31, and then enters the rear water-cooled wall 13 of the furnace. After being heated, it enters the upper header 12 of the radiation evaporation tube bundle II and then flows back into the boiler drum. Both ends of the side water-cooled wall 8 are connected to the boiler drum 6. The water in the boiler drum 6 flows into the side water-cooled walls 8 on the left and right sides, is heated in the side water-cooled walls 8, and then flows back into the boiler drum 6. The generated steam is also discharged from the steam outlet 32. The front water-cooled wall 3 of the furnace, the rear water-cooled wall 13 of the furnace, and the side water-cooled walls 8 on the left and right sides all absorb heat to the greatest extent, thereby improving the thermal efficiency of the boiler.

[0042] To further optimize the solution, the two ends of the radiation evaporation tube bundle I30 are respectively connected to the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the two ends of the radiation evaporation tube bundle II are respectively connected to the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the downcomer II34 is connected to the lower header 29 of the radiation evaporation tube bundle I, the downcomer I31 is connected to the lower header 26 of the radiation evaporation tube bundle II, and the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are both connected to the boiler drum 6.

[0043] The water in the boiler drum 6 reaches the lower header 26 of the radiation evaporation tube bundle II through the downcomer I31, and then reaches the radiation evaporation tube bundle I30 through the lower header 26 of the radiation evaporation tube bundle II. After being heated in the radiation evaporation tube bundle I30, it flows into the upper header 11 of the radiation evaporation tube bundle I. The water in the boiler drum 6 reaches the lower header 29 of the radiation evaporation tube bundle I through the downcomer II34, and then enters the radiation evaporation tube bundle II 25 through the lower header 29 of the radiation evaporation tube bundle I. After being heated in the radiation evaporation tube bundle II 25, it enters the upper header 12 of the radiation evaporation tube bundle II.

[0044] To further optimize the solution, two second sealing plates are fixedly connected to the rear water-cooled wall 13 of the furnace, and the two second sealing plates are correspondingly arranged in the upper and lower parts. Heat exchange tubes are fixedly connected on both sides of the second sealing plates. The second sealing plate is fixedly connected to the flue gas outlet 20 at one end away from the rear water-cooled wall 13 of the furnace. The flue gas outlet 20 is fixedly connected to the heat exchange tube, and the flue gas flow port 19 is connected to the flue gas outlet 20. Both ends of the heat exchange tube are connected to the boiler drum 6, and both ends of the side water-cooled wall 8 are respectively connected to the side water-cooled wall upper header 7 and the side water-cooled wall lower header 1. The side water-cooled wall upper header 7 and the side water-cooled wall lower header 1 are both connected to the boiler drum 6.

[0045] The two second sealing plates arranged above and below and the heat exchange tubes on both sides form a flue gas discharge channel, which is then connected to the flue gas outlet 20, which can be used to discharge the flue gas after combustion. The heat exchange tube is used to absorb the heat in the discharged flue gas to reduce heat loss. The water inlet and outlet ends of the heat exchange tube are both connected to the boiler drum 6. The heated water can flow back into the boiler drum 6. The water in the boiler drum 6 flows into the side water-cooled wall lower header 1, and then flows from the side water-cooled wall lower header 1 into the side water-cooled wall 8. After heating, it flows into the side water-cooled wall upper header 7, and finally flows back to the boiler drum 6. The direction of the flue gas outlet 20 in this embodiment is the same direction as the spray direction of the flame 5.

[0046] According to a further optimized solution, the heat exchange tube is a convection serpentine tube 21, which is fixedly connected to the second sealing plate. Both ends of the convection serpentine tube 21 are respectively connected to the convection serpentine tube bundle upper header 15 and the convection serpentine tube bundle lower header 22.

[0047] The two second sealing plates arranged above and below and the convection serpentine tubes 21 on both sides form a flue gas discharge channel. The flue gas flows into this discharge channel. The water in the convection serpentine tubes 21 can absorb the heat in the flue gas. The convection serpentine tubes 21 improve the utilization rate of the heat in the flue gas and reduce the heat loss with the flue gas. The water in the lower header 22 of the convection serpentine tube bundle flows into the convection serpentine tube 21, and after being heated, flows into the upper header 15 of the convection serpentine tube bundle.

[0048] To further optimize the solution, the upper header 11 of the radiation evaporator tube bundle I and the upper header 12 of the radiation evaporator tube bundle II are connected to the upper header 7 of the side water-cooled wall through the connecting pipe III 10, the boiler drum 6 is connected to a number of gas collecting pipes 16, and a number of connecting pipes II 17 are connected between the upper header 7 of the side water-cooled wall and the gas collecting pipe 16. The upper header 11 of the radiation evaporator tube bundle I and the upper header 12 of the radiation evaporator tube bundle II are connected to the gas collecting pipe 16 through the connecting pipe I 14, the upper header 15 of the convection serpentine tube bundle is respectively connected to the upper header 7 of the side water-cooled wall and the gas collecting pipe 16, and the lower header 22 of the convection serpentine tube bundle is connected to the lower header 1 of the side water-cooled wall.

[0049] The water in the upper header 11 of the radiation evaporator tube bundle I and the upper header 12 of the radiation evaporator tube bundle II enters the side water-cooled wall upper header 7 through the connecting pipe III 10. The steam in the side water-cooled wall upper header 7 can enter the gas collecting pipe 16 through the connecting pipe II 17, and then enter the boiler drum 6 from the gas collecting pipe 16. If the side water-cooled wall upper header 7 is not full of water, steam can also enter the boiler drum 6 through the side water-cooled wall upper header 7. The gas collecting pipe 16 increases the efficiency of steam reflux. The water and steam in the convection serpentine tube bundle upper header 15 can enter the side water-cooled wall upper header 7, the steam in the convection serpentine tube bundle upper header 15 can enter the gas collecting pipe 16, and the water in the side water-cooled wall lower header 1 flows into the convection serpentine tube bundle lower header 22.

[0050] A further optimized solution is that the boiler drum 6 is located above the burner 4, and the boiler drum 6 is connected to several first front downcomers 2. The end of the first front downcomers 2 away from the boiler drum 6 is connected to the side water-cooled wall lower header 1, and a first rear downcomer 18 is connected between the side water-cooled wall upper header 7 and the side water-cooled wall lower header 1, and the convection serpentine tube bundle lower header 22 is connected to the first rear downcomer 18.

[0051] The water in the boiler drum 6 enters the side water-cooled wall lower header 1 through the first front downcomer 2, and the water in the side water-cooled wall upper header 7 enters the side water-cooled wall lower header 1 through the first rear downcomer 18, which can accelerate the circulation of water. The water in the first rear downcomer 18 can enter the convection serpentine tube bundle lower header 22, quickly filling the convection serpentine tube 21 with water.

[0052] In this embodiment, the mixture of combustible gas and air is sprayed into the expansion combustion chamber 9 surrounded by the front water-cooled wall 3 of the furnace and the side water-cooled walls 8 on the left and right sides through the burner 4, and burns therein. The heat generated by the combustion is absorbed by the front water-cooled wall 3 of the furnace and the side water-cooled walls 8 on the left and right sides. At the same time, the high-temperature flue gas and high-temperature flame generated at the same time move backward while burning; and reach the steady-pressure combustion chamber 27. The upper header 11 of the radiation evaporation tube bundle I, the first sealing plate 28, the upper header 12 of the radiation evaporation tube bundle II, the lower header 29 of the radiation evaporation tube bundle I, the lower header 26 of the radiation evaporation tube bundle II and the side water-cooled walls 8 on both sides form the steady-pressure combustion chamber 27. The flame 5 generated by the combustion and the high-temperature flue gas are horizontally Flushing the radiation evaporation tube bundles I30 and II25 for heat exchange lowers the furnace temperature and reduces the gas flow rate, thus achieving stable combustion and reducing the formation of nitrogen oxides. The flue gas continues to flow backward to the backfire burnout chamber 24, which is formed by the furnace rear water-cooled wall 13 and the left and right side water-cooled walls 8. The radiation recirculation screen 23 within the flue gas flow opening 19 redirects some flue gas back to the combustion area, lowering the maximum temperature in the flame area and thus reducing the formation of nitrogen oxides, thereby reducing nitrogen oxide emissions and saving energy. It also reduces the concentrations of oxygen and nitrogen, also contributing to the reduction of nitrogen oxides. This also allows the flue gas to better fill the furnace, increasing the heat absorption of the furnace rear water-cooled wall 13 and the left and right side water-cooled walls 8, lowering the flue gas temperature at the flue gas flow opening 19, ensuring more complete combustion and improving the thermal efficiency of the boiler. The two second sealing plates arranged above and below and the convection serpentine tubes 21 on both sides form a flue gas discharge channel. Part of the flue gas flows into this discharge channel through the flue gas flow port 19. The water in the convection serpentine tubes 21 exchanges heat with the flue gas containing heat. Finally, the flue gas is discharged from the flue gas outlet 20, completing the boiler combustion heat exchange process.

[0053] Water circulation process: The upper space of the boiler drum 6, the interior of the gas collecting pipe 16, and the upper space inside the side water-cooled wall upper headers 7 on both sides are steam spaces; the lower space of the boiler drum 6, the lower space inside the side water-cooled wall upper headers 7 on both sides, the first front downcomer 2, the first rear downcomer 18, downcomer I 31, downcomer II 34, the lower side water-cooled wall lower header 1, the radiation evaporator tube bundle I lower header 29, the radiation evaporator tube bundle II lower header 26, and the convection serpentine tube bundle lower header 22 are water spaces;

[0054] Water enters the boiler drum 6 from the water inlet 33, flows from the boiler drum 6 into the side water-cooled wall lower header 1 through the first front downcomer 2, and then enters the side water-cooled wall 8 from the side water-cooled wall lower header 1. After heat exchange, steam and water enter the side water-cooled wall upper header 7 from the side water-cooled wall 8. The generated steam can enter the gas collecting pipe 16 and finally return to the boiler drum 6. The steam is discharged from the steam outlet 32, and the water remains in the boiler drum 6.

[0055] Water flows from the boiler drum 6 through the side water-cooled wall upper header 7 into the first rear downcomer 18, and then enters the convection serpentine tube 21 from the first rear downcomer 18. After heat exchange, the water and steam enter the convection serpentine tube bundle upper header 15, and then enter the side water-cooled wall upper header 7 from the convection serpentine tube bundle upper header 15. The steam can enter the gas collecting pipe 16 and finally return to the boiler drum 6. The steam is discharged from the steam outlet 32, and the water remains in the boiler drum 6.

[0056] The water flows from the boiler drum 6 into the downcomer II 34 and the downcomer I 31, enters the radiation evaporation tube bundle I 30 from the downcomer II 34, and enters the radiation evaporation tube bundle II 25 from the downcomer I 31. After heat exchange in the radiation evaporation tube bundle I 30 and the radiation evaporation tube bundle II 25, the water enters the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II respectively. The water and steam can enter the upper header 7 of the side water-cooled wall, and the steam can enter the gas collecting pipe 16. Finally, it returns to the boiler drum 6. The steam is discharged from the steam outlet 32, and the water remains in the boiler drum 6.

[0057] Example 2

[0058] Reference Figure 3 The difference between this embodiment and the first embodiment is that the smoke outlet 20 is vertically upward, the smoke flow opening 19 is located at a lower position, and the convection serpentine tube 21 is placed horizontally.

[0059] Example 3

[0060] Reference Figure 4

[0061] A hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle, comprising:

[0062] A gradually expanding combustion chamber includes a pressure-expanding combustion chamber 9, a pressure-stabilizing combustion chamber 27, and a backfire burnout chamber 24. The pressure-expanding combustion chamber 9, the pressure-stabilizing combustion chamber 27, and the backfire burnout chamber 24 are interconnected. An air inlet is provided on the pressure-expanding combustion chamber 9, and a burner 4 is provided on the air inlet. A flue gas flow opening 19 is provided on the backfire burnout chamber 24, and a radiation recirculation screen 23 is provided in the flue gas flow opening 19. A radiation evaporation tube bundle I30 and a radiation evaporation tube bundle II 25 are provided in the pressure-stabilizing combustion chamber 27.

[0063] Circulation pipe, the circulation pipe includes a downcomer I31 and a downcomer II34, one end of the downcomer I31 is connected to the lower end of the radiation evaporation tube bundle II25, and the other end of the downcomer I31 is connected to the boiler drum 6, one end of the downcomer II34 is connected to the lower end of the radiation evaporation tube bundle I30, and the other end of the downcomer II34 is connected to the boiler drum 6, the upper end of the radiation evaporation tube bundle II25 and the upper end of the radiation evaporation tube bundle I30 are both connected to the boiler drum 6, and the boiler drum 6 is provided with a water inlet 33 and a steam outlet 32.

[0064] Further optimization scheme, the pressure-expanding combustion chamber 9 includes the front water-cooled wall 3 of the furnace, the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the side water-cooled wall 8 is fixedly connected on both sides of the front water-cooled wall 3 of the furnace, and the front water-cooled wall 3 is respectively connected with the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the backfire burnout chamber 24 includes the rear water-cooled wall 13 of the furnace, the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the side water-cooled wall 8 is fixedly connected on both sides of the rear water-cooled wall 13 of the furnace, and the rear water-cooled wall 13 is respectively connected with the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the pressure-stabilizing combustion chamber 27 It includes a first sealing plate 28, the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate 28, the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are both connected to the boiler drum 6, the lower header 29 of the radiation evaporation tube bundle I and the lower header 26 of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate 28, both sides of the first sealing plate 28 are fixedly connected to the side water-cooled wall 8, both ends of the side water-cooled wall 8 are connected to the boiler drum 6, the air inlet is opened on the front water-cooled wall 3 of the furnace, the flue gas flow port 19 is opened on the rear water-cooled wall 13 of the furnace, and the radiation recirculation screen 23 is fixedly connected to the rear water-cooled wall 13 of the furnace through a connecting rod.

[0065] To further optimize the solution, the two ends of the radiation evaporation tube bundle I30 are respectively connected to the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the two ends of the radiation evaporation tube bundle II are respectively connected to the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the downcomer II34 is connected to the lower header 29 of the radiation evaporation tube bundle I, the downcomer I31 is connected to the lower header 26 of the radiation evaporation tube bundle II, and the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are both connected to the boiler drum 6.

[0066] To further optimize the solution, two second sealing plates are fixedly connected to the rear water-cooled wall 13 of the furnace, and the two second sealing plates are correspondingly arranged in the upper and lower parts. Heat exchange tubes are fixedly connected on both sides of the second sealing plates. The second sealing plate is fixedly connected to the flue gas outlet 20 at one end away from the rear water-cooled wall 13 of the furnace. The flue gas outlet 20 is fixedly connected to the heat exchange tube, and the flue gas flow port 19 is connected to the flue gas outlet 20. Both ends of the heat exchange tube are connected to the boiler drum 6, and both ends of the side water-cooled wall 8 are respectively connected to the side water-cooled wall upper header 7 and the side water-cooled wall lower header 1. The side water-cooled wall upper header 7 and the side water-cooled wall lower header 1 are both connected to the boiler drum 6.

[0067] According to a further optimized solution, the heat exchange tube is a convection serpentine tube 21, which is fixedly connected to the second sealing plate. Both ends of the convection serpentine tube 21 are respectively connected to the convection serpentine tube bundle upper header 15 and the convection serpentine tube bundle lower header 22.

[0068] To further optimize the solution, the upper header 11 of the radiation evaporator tube bundle I and the upper header 12 of the radiation evaporator tube bundle II are connected to the upper header 7 of the side water-cooled wall through the connecting pipe III 10, the boiler drum 6 is connected to a number of gas collecting pipes 16, and a number of connecting pipes II 17 are connected between the upper header 7 of the side water-cooled wall and the gas collecting pipe 16. The upper header 11 of the radiation evaporator tube bundle I and the upper header 12 of the radiation evaporator tube bundle II are connected to the gas collecting pipe 16 through the connecting pipe I 14, the upper header 15 of the convection serpentine tube bundle is respectively connected to the upper header 7 of the side water-cooled wall and the gas collecting pipe 16, and the lower header 22 of the convection serpentine tube bundle is connected to the lower header 1 of the side water-cooled wall.

[0069] The difference between this embodiment and the first embodiment is that: the boiler drum 6 is located above the flue gas outlet 20, and is connected to a plurality of second rear downcomers 1801. The second rear downcomers 1801 are connected to the side water-cooled wall lower header 1 at one end away from the boiler drum 6. A second front downcomer 201 is connected between the side water-cooled wall upper header 7 and the side water-cooled wall lower header 1, and the convection serpentine tube bundle lower header 22 is connected to the second rear downcomers 1801.

[0070] The water in the boiler drum 6 enters the convection serpentine tube bundle lower header 22 and the side water-cooled wall lower header 1 through the second rear downcomer 1801 , and the side water-cooled wall upper header 7 is connected to the side water-cooled wall lower header 1 through the second front downcomer 201 .

[0071] Example 4

[0072] Reference Figure 5 、 Figure 6

[0073] A hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle, comprising:

[0074] A gradually expanding combustion chamber includes a pressure-expanding combustion chamber 9, a pressure-stabilizing combustion chamber 27, and a backfire burnout chamber 24. The pressure-expanding combustion chamber 9, the pressure-stabilizing combustion chamber 27, and the backfire burnout chamber 24 are interconnected. An air inlet is provided on the pressure-expanding combustion chamber 9, and a burner 4 is provided on the air inlet. A flue gas flow opening 19 is provided on the backfire burnout chamber 24, and a radiation recirculation screen 23 is provided in the flue gas flow opening 19. A radiation evaporation tube bundle I30 and a radiation evaporation tube bundle II 25 are provided in the pressure-stabilizing combustion chamber 27.

[0075] Circulation pipe, the circulation pipe includes a downcomer I31 and a downcomer II34, one end of the downcomer I31 is connected to the lower end of the radiation evaporation tube bundle II25, and the other end of the downcomer I31 is connected to the boiler drum 6, one end of the downcomer II34 is connected to the lower end of the radiation evaporation tube bundle I30, and the other end of the downcomer II34 is connected to the boiler drum 6, the upper end of the radiation evaporation tube bundle II25 and the upper end of the radiation evaporation tube bundle I30 are both connected to the boiler drum 6, and the boiler drum 6 is provided with a water inlet 33 and a steam outlet 32.

[0076] Further optimization scheme, the pressure-expanding combustion chamber 9 includes the front water-cooled wall 3 of the furnace, the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the side water-cooled wall 8 is fixedly connected on both sides of the front water-cooled wall 3 of the furnace, and the front water-cooled wall 3 is respectively connected with the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the backfire burnout chamber 24 includes the rear water-cooled wall 13 of the furnace, the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the side water-cooled wall 8 is fixedly connected on both sides of the rear water-cooled wall 13 of the furnace, and the rear water-cooled wall 13 is respectively connected with the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the pressure-stabilizing combustion chamber 27 It includes a first sealing plate 28, the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate 28, the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are both connected to the boiler drum 6, the lower header 29 of the radiation evaporation tube bundle I and the lower header 26 of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate 28, both sides of the first sealing plate 28 are fixedly connected to the side water-cooled wall 8, both ends of the side water-cooled wall 8 are connected to the boiler drum 6, the air inlet is opened on the front water-cooled wall 3 of the furnace, the flue gas flow port 19 is opened on the rear water-cooled wall 13 of the furnace, and the radiation recirculation screen 23 is fixedly connected to the rear water-cooled wall 13 of the furnace through a connecting rod.

[0077] To further optimize the solution, the two ends of the radiation evaporation tube bundle I30 are respectively connected to the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the two ends of the radiation evaporation tube bundle II are respectively connected to the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the downcomer II34 is connected to the lower header 29 of the radiation evaporation tube bundle I, the downcomer I31 is connected to the lower header 26 of the radiation evaporation tube bundle II, and the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are both connected to the boiler drum 6.

[0078] To further optimize the solution, two second sealing plates are fixedly connected to the rear water-cooled wall 13 of the furnace, and the two second sealing plates are correspondingly arranged in the upper and lower parts. Heat exchange tubes are fixedly connected on both sides of the second sealing plates. The second sealing plate is fixedly connected to the flue gas outlet 20 at one end away from the rear water-cooled wall 13 of the furnace. The flue gas outlet 20 is fixedly connected to the heat exchange tube, and the flue gas flow port 19 is connected to the flue gas outlet 20. Both ends of the heat exchange tube are connected to the boiler drum 6, and both ends of the side water-cooled wall 8 are respectively connected to the side water-cooled wall upper header 7 and the side water-cooled wall lower header 1. The side water-cooled wall upper header 7 and the side water-cooled wall lower header 1 are both connected to the boiler drum 6.

[0079] According to a further optimized solution, the heat exchange tube is a convection serpentine tube 21, which is fixedly connected to the second sealing plate. Both ends of the convection serpentine tube 21 are respectively connected to the convection serpentine tube bundle upper header 15 and the convection serpentine tube bundle lower header 22.

[0080] The difference between this embodiment and the first embodiment is that: the boiler drum 6 is connected to the water supply pipe 1601 and the third front downcomer 202, the side water-cooled wall upper header 7 and the side water-cooled wall lower header 1 are connected by the third rear downcomer 1802, the third front downcomer 202 is connected to the side water-cooled wall lower header 1, the water supply pipe 1601 is connected to the convection serpentine tube bundle lower header 22, the third rear downcomer 1802 is connected to the convection serpentine tube bundle lower header 22, the radiation evaporation tube bundle I upper header 11 is connected to the boiler drum 6 through the return water pipe II 1701, the radiation evaporation tube bundle II upper header 12 is connected to the boiler drum 6 through the return water pipe I 1001, the convection serpentine tube bundle upper header 15 is connected to the water outlet header 3201, and a blocking plate is fixedly connected to the steam outlet 32.

[0081] In this embodiment, the steam boiler is modified into a hot water boiler, and the steam outlet 32 ​​is blocked with a plugging plate. Water enters the boiler drum 6 through the water inlet 33, flows through the water supply pipe 1601 to the lower header 22 of the convection serpentine tube bundle, then enters the convection serpentine tube bundle 21, and then enters the upper header 15 of the convection serpentine tube bundle, finally reaching the outlet header 3201. The water in the upper header 11 of the radiation evaporation tube bundle I returns to the boiler drum 6 through the return pipe I 1001, and the water in the upper header 11 of the radiation evaporation tube bundle I returns to the boiler drum 6 through the return pipe II 1701.

[0082] Example 5

[0083] Reference Figure 7 、 Figure 8

[0084] A hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle, comprising:

[0085] A gradually expanding combustion chamber includes a pressure-expanding combustion chamber 9, a pressure-stabilizing combustion chamber 27, and a backfire burnout chamber 24. The pressure-expanding combustion chamber 9, the pressure-stabilizing combustion chamber 27, and the backfire burnout chamber 24 are interconnected. An air inlet is provided on the pressure-expanding combustion chamber 9, and a burner 4 is provided on the air inlet. A flue gas flow opening 19 is provided on the backfire burnout chamber 24, and a radiation recirculation screen 23 is provided in the flue gas flow opening 19. A radiation evaporation tube bundle I30 and a radiation evaporation tube bundle II 25 are provided in the pressure-stabilizing combustion chamber 27.

[0086] Circulation pipe, the circulation pipe includes a downcomer I31 and a downcomer II34, one end of the downcomer I31 is connected to the lower end of the radiation evaporation tube bundle II25, and the other end of the downcomer I31 is connected to the boiler drum 6, one end of the downcomer II34 is connected to the lower end of the radiation evaporation tube bundle I30, and the other end of the downcomer II34 is connected to the boiler drum 6, the upper end of the radiation evaporation tube bundle II25 and the upper end of the radiation evaporation tube bundle I30 are both connected to the boiler drum 6, and the boiler drum 6 is provided with a water inlet 33 and a steam outlet 32.

[0087] Further optimization scheme, the pressure-expanding combustion chamber 9 includes the front water-cooled wall 3 of the furnace, the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the side water-cooled wall 8 is fixedly connected on both sides of the front water-cooled wall 3 of the furnace, and the front water-cooled wall 3 is respectively connected with the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the backfire burnout chamber 24 includes the rear water-cooled wall 13 of the furnace, the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the side water-cooled wall 8 is fixedly connected on both sides of the rear water-cooled wall 13 of the furnace, and the rear water-cooled wall 13 is respectively connected with the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the pressure-stabilizing combustion chamber 27 It includes a first sealing plate 28, the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate 28, the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are both connected to the boiler drum 6, the lower header 29 of the radiation evaporation tube bundle I and the lower header 26 of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate 28, both sides of the first sealing plate 28 are fixedly connected to the side water-cooled wall 8, both ends of the side water-cooled wall 8 are connected to the boiler drum 6, the air inlet is opened on the front water-cooled wall 3 of the furnace, the flue gas flow port 19 is opened on the rear water-cooled wall 13 of the furnace, and the radiation recirculation screen 23 is fixedly connected to the rear water-cooled wall 13 of the furnace through a connecting rod.

[0088] To further optimize the solution, the two ends of the radiation evaporation tube bundle I30 are respectively connected to the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the two ends of the radiation evaporation tube bundle II are respectively connected to the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the downcomer II34 is connected to the lower header 29 of the radiation evaporation tube bundle I, the downcomer I31 is connected to the lower header 26 of the radiation evaporation tube bundle II, and the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are both connected to the boiler drum 6.

[0089] To further optimize the solution, two second sealing plates are fixedly connected to the rear water-cooled wall 13 of the furnace, and the two second sealing plates are correspondingly arranged in the upper and lower parts. Heat exchange tubes are fixedly connected on both sides of the second sealing plates. The second sealing plate is fixedly connected to the flue gas outlet 20 at one end away from the rear water-cooled wall 13 of the furnace. The flue gas outlet 20 is fixedly connected to the heat exchange tube, and the flue gas flow port 19 is connected to the flue gas outlet 20. Both ends of the heat exchange tube are connected to the boiler drum 6, and both ends of the side water-cooled wall 8 are respectively connected to the side water-cooled wall upper header 7 and the side water-cooled wall lower header 1. The side water-cooled wall upper header 7 and the side water-cooled wall lower header 1 are both connected to the boiler drum 6.

[0090] According to a further optimized solution, the heat exchange tube is a convection serpentine tube 21, which is fixedly connected to the second sealing plate. Both ends of the convection serpentine tube 21 are respectively connected to the convection serpentine tube bundle upper header 15 and the convection serpentine tube bundle lower header 22.

[0091] To further optimize the solution, the upper header 11 of the radiation evaporator tube bundle I and the upper header 12 of the radiation evaporator tube bundle II are connected to the upper header 7 of the side water-cooled wall through the connecting pipe III 10, the boiler drum 6 is connected to a number of gas collecting pipes 16, and a number of connecting pipes II 17 are connected between the upper header 7 of the side water-cooled wall and the gas collecting pipe 16. The upper header 11 of the radiation evaporator tube bundle I and the upper header 12 of the radiation evaporator tube bundle II are connected to the gas collecting pipe 16 through the connecting pipe I 14, the upper header 15 of the convection serpentine tube bundle is respectively connected to the upper header 7 of the side water-cooled wall and the gas collecting pipe 16, and the lower header 22 of the convection serpentine tube bundle is connected to the lower header 1 of the side water-cooled wall.

[0092] A further optimized solution is that the boiler drum 6 is located above the burner 4, and the boiler drum 6 is connected to several first front downcomers 2. The end of the first front downcomers 2 away from the boiler drum 6 is connected to the side water-cooled wall lower header 1, and a first rear downcomer 18 is connected between the side water-cooled wall upper header 7 and the side water-cooled wall lower header 1, and the convection serpentine tube bundle lower header 22 is connected to the first rear downcomer 18.

[0093] The difference between this embodiment and the first embodiment is that a water supply header 36 is connected between the first front downcomer 2 and the side water-cooled wall lower header 1 , a return water header 35 is connected to the side water-cooled wall upper header 7 , and the return water header 35 is connected to the boiler drum 6 .

[0094] In this embodiment, the boiler drum 6 is placed longitudinally on the upper left side of the boiler. Water enters the boiler drum 6 from the water inlet 33, enters the side water-cooled wall lower header 1 on both sides through the first front downcomer 2, and then enters the side water-cooled walls 8 on both sides. After radiation heat exchange, the water generates steam on the heating surface and flows upward. The generated steam is collected in the upper steam space of the side water-cooled wall upper header 7 on the left and right sides and inside the left and right collecting pipes 16, and finally leaves the boiler through the steam outlet 32. The water that has not been completely evaporated flows into the return water header 35 through the lower water space of the side water-cooled wall upper header 7 on the left and right sides for redistribution and circulation, thereby completing the water circulation of the left and right side water-cooled walls 8.

[0095] Example 6

[0096] Reference Figure 9 、 Figure 10

[0097] A hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle, comprising:

[0098] A gradually expanding combustion chamber includes a pressure-expanding combustion chamber 9, a pressure-stabilizing combustion chamber 27, and a backfire burnout chamber 24. The pressure-expanding combustion chamber 9, the pressure-stabilizing combustion chamber 27, and the backfire burnout chamber 24 are interconnected. An air inlet is provided on the pressure-expanding combustion chamber 9, and a burner 4 is provided on the air inlet. A flue gas flow opening 19 is provided on the backfire burnout chamber 24, and a radiation recirculation screen 23 is provided in the flue gas flow opening 19. A radiation evaporation tube bundle I30 and a radiation evaporation tube bundle II 25 are provided in the pressure-stabilizing combustion chamber 27.

[0099] Circulation pipe, the circulation pipe includes a downcomer I31 and a downcomer II34, one end of the downcomer I31 is connected to the lower end of the radiation evaporation tube bundle II25, and the other end of the downcomer I31 is connected to the boiler drum 6, one end of the downcomer II34 is connected to the lower end of the radiation evaporation tube bundle I30, and the other end of the downcomer II34 is connected to the boiler drum 6, the upper end of the radiation evaporation tube bundle II25 and the upper end of the radiation evaporation tube bundle I30 are both connected to the boiler drum 6, and the boiler drum 6 is provided with a water inlet 33 and a steam outlet 32.

[0100] Further optimization scheme, the pressure-expanding combustion chamber 9 includes the front water-cooled wall 3 of the furnace, the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the side water-cooled wall 8 is fixedly connected on both sides of the front water-cooled wall 3 of the furnace, and the front water-cooled wall 3 is respectively connected with the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the backfire burnout chamber 24 includes the rear water-cooled wall 13 of the furnace, the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the side water-cooled wall 8 is fixedly connected on both sides of the rear water-cooled wall 13 of the furnace, and the rear water-cooled wall 13 is respectively connected with the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the pressure-stabilizing combustion chamber 27 It includes a first sealing plate 28, the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate 28, the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are both connected to the boiler drum 6, the lower header 29 of the radiation evaporation tube bundle I and the lower header 26 of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate 28, both sides of the first sealing plate 28 are fixedly connected to the side water-cooled wall 8, both ends of the side water-cooled wall 8 are connected to the boiler drum 6, the air inlet is opened on the front water-cooled wall 3 of the furnace, the flue gas flow port 19 is opened on the rear water-cooled wall 13 of the furnace, and the radiation recirculation screen 23 is fixedly connected to the rear water-cooled wall 13 of the furnace through a connecting rod.

[0101] To further optimize the solution, the two ends of the radiation evaporation tube bundle I30 are respectively connected to the upper header 11 of the radiation evaporation tube bundle I and the lower header 29 of the radiation evaporation tube bundle I, the two ends of the radiation evaporation tube bundle II are respectively connected to the upper header 12 of the radiation evaporation tube bundle II and the lower header 26 of the radiation evaporation tube bundle II, the downcomer II34 is connected to the lower header 29 of the radiation evaporation tube bundle I, the downcomer I31 is connected to the lower header 26 of the radiation evaporation tube bundle II, and the upper header 11 of the radiation evaporation tube bundle I and the upper header 12 of the radiation evaporation tube bundle II are both connected to the boiler drum 6.

[0102] To further optimize the solution, two second sealing plates are fixedly connected to the rear water-cooled wall 13 of the furnace, and the two second sealing plates are correspondingly arranged in the upper and lower parts. Heat exchange tubes are fixedly connected on both sides of the second sealing plates. The second sealing plate is fixedly connected to the flue gas outlet 20 at one end away from the rear water-cooled wall 13 of the furnace. The flue gas outlet 20 is fixedly connected to the heat exchange tube, and the flue gas flow port 19 is connected to the flue gas outlet 20. Both ends of the heat exchange tube are connected to the boiler drum 6, and both ends of the side water-cooled wall 8 are respectively connected to the side water-cooled wall upper header 7 and the side water-cooled wall lower header 1. The side water-cooled wall upper header 7 and the side water-cooled wall lower header 1 are both connected to the boiler drum 6.

[0103] According to a further optimized solution, the heat exchange tube is a convection serpentine tube 21, which is fixedly connected to the second sealing plate. Both ends of the convection serpentine tube 21 are respectively connected to the convection serpentine tube bundle upper header 15 and the convection serpentine tube bundle lower header 22.

[0104] The present embodiment differs from the first embodiment in that the heat exchange tubes are convection tube bundles 2101, which are fixedly connected to the second sealing plate. One end of the convection tube bundle 2101 is connected to the boiler drum 6, and the other end of the convection tube bundle 2101 is connected to the convection tube bundle header 2201. The side water-cooled wall lower header 1 is connected to the convection tube bundle header 2201. The side water-cooled wall upper header 7 and the side water-cooled wall lower header 1 are connected by a fourth front downcomer 203. The boiler drum 6 is connected to the first header 2202, and the convection tube bundle 2101 header is connected to the second header 350. 1. A fourth rear downcomer 1803 connects the first header 2202 and the second header 3501. The upper headers 11 and 12 of the radiation evaporator tube bundle I and II are connected to the side water-cooled wall upper header 7 via connecting pipes IV 1002. Several second gas collecting pipes 1602 are connected to the boiler drum 6. Several connecting pipes V 1702 connect the side water-cooled wall upper header 7 and gas collecting pipe 1602. The upper headers 11 and 12 of the radiation evaporator tube bundle I and II are connected to gas collecting pipe 1602 via connecting pipes VI 1401.

[0105] In this embodiment, water enters the boiler drum 6 from the water inlet 33, the water in the boiler drum 6 flows into the first header 2202, and flows from the first header 2202 into the convection tube bundle header 2201 through the fourth rear downcomer 1803. The boiler drum 6 can quickly fill the convection tube bundle 2101 with water. After heat exchange, the water in the convection tube bundle 2101 flows back into the boiler drum 6, and the water in the convection tube bundle header 2201 can flow into the convection tube bundle 2101.

[0106] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0107] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle, characterized in that: include: A gradually expanding combustion chamber, the gradually expanding combustion chamber comprising a pressure-expanding combustion chamber (9), a pressure-stabilizing combustion chamber (27) and a backfire burnout chamber (24), the pressure-expanding combustion chamber (9), the pressure-stabilizing combustion chamber (27) and the backfire burnout chamber (24) being interconnected, an air inlet being provided on the pressure-expanding combustion chamber (9), a burner (4) being provided on the air inlet, a flue gas flow opening (19) being provided on the backfire burnout chamber (24), a radiation reflow screen (23) being provided in the flue gas flow opening (19), and a radiation evaporation tube bundle I (30) and a radiation evaporation tube bundle II (25) being provided in the pressure-stabilizing combustion chamber (27); A circulation pipe, the circulation pipe includes a downcomer I (31) and a downcomer II (34), one end of the downcomer I (31) is connected to the lower end of the radiation evaporation tube bundle II (25), the other end of the downcomer I (31) is connected to the boiler drum (6), one end of the downcomer II (34) is connected to the lower end of the radiation evaporation tube bundle I (30), the other end of the downcomer II (34) is connected to the boiler drum (6), the upper end of the radiation evaporation tube bundle II (25) and the upper end of the radiation evaporation tube bundle I (30) are both connected to the boiler drum (6), and the boiler drum (6) is provided with a water inlet (33) and a steam outlet (32); The pressure-expanding combustion chamber (9) includes a furnace front water-cooled wall (3), an upper header (11) of the radiation evaporation tube bundle I, and a lower header (29) of the radiation evaporation tube bundle I. Side water-cooled walls (8) are fixedly connected on both sides of the furnace front water-cooled wall (3). The furnace front water-cooled wall (3) is respectively connected to the upper header (11) of the radiation evaporation tube bundle I and the lower header (29) of the radiation evaporation tube bundle I. The backfire burnout chamber (24) includes a furnace rear water-cooled wall (13), an upper header (12) of the radiation evaporation tube bundle II, and a lower header (26) of the radiation evaporation tube bundle II. Side water-cooled walls (8) are fixedly connected on both sides of the furnace rear water-cooled wall (13). The furnace rear water-cooled wall (13) is respectively connected to the upper header (12) of the radiation evaporation tube bundle II and the lower header (26) of the radiation evaporation tube bundle II. The pressure-stabilizing combustion chamber (27) includes a first sealing plate (28). The upper header (11) of the radiation evaporation tube bundle I and the upper header (12) of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate (28), and the upper header (11) of the radiation evaporation tube bundle I and the upper header (12) of the radiation evaporation tube bundle II are both communicated with the boiler drum (6). The lower header (29) of the radiation evaporation tube bundle I and the lower header (26) of the radiation evaporation tube bundle II are fixedly connected through the first sealing plate (28), and both sides of the first sealing plate (28) are fixedly connected to the side water-cooled wall (8), and both ends of the side water-cooled wall (8) are communicated with the boiler drum (6). The air inlet is opened on the front water-cooled wall (3) of the furnace, and the flue gas flow port (19) is opened on the rear water-cooled wall (13) of the furnace. The radiation recirculation screen (23) is fixedly connected to the rear water-cooled wall (13) of the furnace through a connecting rod. Two second sealing plates are fixedly connected to the furnace rear water-cooled wall (13), and the two second sealing plates are correspondingly arranged above and below. Heat exchange tubes are fixedly connected to both sides of the second sealing plates. A flue gas outlet (20) is fixedly connected to one end of the second sealing plate away from the furnace rear water-cooled wall (13). The flue gas outlet (20) is fixedly connected to the heat exchange tube. The flue gas flow port (19) is connected to the flue gas outlet (20). Both ends of the heat exchange tube are connected to the boiler drum (6). Both ends of the side water-cooled wall (8) are connected to the side water-cooled wall upper header (7) and the side water-cooled wall lower header (1). The side water-cooled wall upper header (7) and the side water-cooled wall lower header (1) are both connected to the boiler drum (6).

2. The hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle according to claim 1, characterized in that: The two ends of the radiation evaporation tube bundle I (30) are respectively connected to the upper header (11) of the radiation evaporation tube bundle I and the lower header (29) of the radiation evaporation tube bundle I; the two ends of the radiation evaporation tube bundle II (25) are respectively connected to the upper header (12) of the radiation evaporation tube bundle II and the lower header (26) of the radiation evaporation tube bundle II; the downcomer II (34) is connected to the lower header (29) of the radiation evaporation tube bundle I; the downcomer I (31) is connected to the lower header (26) of the radiation evaporation tube bundle II; the upper header (11) of the radiation evaporation tube bundle I and the upper header (12) of the radiation evaporation tube bundle II are both connected to the boiler drum (6).

3. The hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle according to claim 1, characterized in that: The heat exchange tube is a convection serpentine tube (21), the convection serpentine tube (21) is fixedly connected to the second sealing plate, and the two ends of the convection serpentine tube (21) are respectively connected to the convection serpentine tube bundle upper header (15) and the convection serpentine tube bundle lower header (22).

4. The hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle according to claim 3 is characterized in that: The upper header (11) of the radiation evaporation tube bundle I and the upper header (12) of the radiation evaporation tube bundle II are connected to the upper header (7) of the side water-cooled wall through the connecting pipe III (10); the boiler drum (6) is connected to a plurality of gas collecting pipes I (16); a plurality of connecting pipes II (17) are connected between the upper header (7) of the side water-cooled wall and the gas collecting pipes I (16); the upper header (11) of the radiation evaporation tube bundle I and the upper header (12) of the radiation evaporation tube bundle II are connected to the gas collecting pipes I (16) through the connecting pipe I (14); the upper header (15) of the convection serpentine tube bundle is respectively connected to the upper header (7) of the side water-cooled wall and the gas collecting pipes I (16); the lower header (22) of the convection serpentine tube bundle is connected to the lower header (1) of the side water-cooled wall.

5. The hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle according to claim 4, characterized in that: The boiler drum (6) is located above the burner (4), and the boiler drum (6) is connected to a plurality of first front downcomers (2). One end of the first front downcomers (2) away from the boiler drum (6) is connected to the side water-cooled wall lower header (1). A first rear downcomer (18) is connected between the side water-cooled wall upper header (7) and the side water-cooled wall lower header (1), and the convection serpentine tube bundle lower header (22) is connected to the first rear downcomer (18).

6. The hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle according to claim 5, characterized in that: The boiler drum (6) is located above the flue gas outlet (20), and the boiler drum (6) is connected to a plurality of second rear downcomers (1801). The second rear downcomers (1801) are connected to the side water-cooled wall lower header (1) at one end away from the boiler drum (6). A second front downcomer (201) is connected between the side water-cooled wall upper header (7) and the side water-cooled wall lower header (1), and the convection serpentine tube bundle lower header (22) is connected to the second rear downcomers (1801).

7. The hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle according to claim 3, characterized in that: The boiler drum (6) is connected to a water supply pipe (1601) and a third front downcomer (202); the side water-cooled wall upper header (7) and the side water-cooled wall lower header (1) are connected to a third rear downcomer (1802); the third front downcomer (202) is connected to the side water-cooled wall lower header (1); the water supply pipe (1601) is connected to the convection serpentine tube bundle lower header (22); the third rear downcomer (180 2) is connected to the lower header (22) of the convection serpentine tube bundle, the upper header (11) of the radiation evaporation tube bundle I is connected to the boiler drum (6) through the return pipe II (1701), the upper header (12) of the radiation evaporation tube bundle II is connected to the boiler drum (6) through the return pipe I (1001), the upper header (15) of the convection serpentine tube bundle is connected to the water outlet header (3201), and a blocking plate is fixedly connected to the steam outlet (32).

8. The hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle according to claim 5, characterized in that: A water supply header (36) is connected between the first front downcomer (2) and the side water-cooled wall lower header (1), a return water header (35) is connected between the side water-cooled wall upper header (7), and the return water header (35) is connected to the boiler drum (6).

9. The hydrogen-fired gas boiler with a gradually expanding combustion chamber containing a radiation evaporation tube bundle according to claim 1, characterized in that: The heat exchange tube is a convection tube bundle (2101), the convection tube bundle (2101) is fixedly connected to the second sealing plate, one end of the convection tube bundle (2101) is connected to the boiler drum (6), the other end of the convection tube bundle (2101) is connected to the convection tube bundle header (2201), the side water-cooled wall lower header (1) is connected to the convection tube bundle header (2201), the side water-cooled wall upper header (7) and the side water-cooled wall lower header (1) are connected with a fourth front downcomer (203), the boiler drum (6) is connected to the first header (2202), the convection tube bundle (2101) header is connected to the second header (3501), the first header A fourth rear downcomer (1803) is connected between (2202) and the second header (3501); the upper header (11) of the radiation evaporation tube bundle I and the upper header (12) of the radiation evaporation tube bundle II are connected to the upper header (7) of the side water-cooled wall via a connecting pipe IV (1002); the boiler drum (6) is connected to a plurality of gas collecting pipes II (1602); a plurality of connecting pipes V (1702) are connected between the upper header (7) of the side water-cooled wall and the gas collecting pipe II (1602); the upper header (11) of the radiation evaporation tube bundle I and the upper header (12) of the radiation evaporation tube bundle II are connected to the gas collecting pipe II (1602) via a connecting pipe VI (1401).

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