Multi-surface combustion water-cooled low-nitrogen combustor

Abstract

The application discloses a multi-surface combustion water-cooled low-nitrogen combustor which comprises an air inlet assembly, a cyclone device and a uniform gas chamber. The air inlet assembly comprises a fan, the cyclone device comprises a gas inlet, air and gas enter the uniform gas chamber through the cyclone device, the uniform gas chamber is arranged on one side of a furnace chamber, a combustion chamber is arranged on the side of the furnace chamber close to the uniform gas chamber, ignition assemblies are arranged on the two sides of the combustion chamber, and a smoke exhaust pipe is arranged in the combustion chamber. The air and gas are uniformly mixed through the cyclone device, the air distribution plate and the special-shaped corrugated plate, the uniform arrangement of the flame is ensured, local high temperature is avoided, and the generation of thermal NOx is reduced. The overall structure is compact, the flame is short, a large furnace is not needed, the overall size of the boiler can be effectively reduced, the floor area is reduced, and the multi-surface combustion water-cooled low-nitrogen combustor is suitable for promotion and use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam boiler, in particular to a multi-surface combustion water-cooled low-nitrogen burner. BACKGROUND

[0002] The boiler is an energy conversion device, and the energy input into the boiler includes chemical energy in fuel and electric energy, and the boiler outputs steam or high-temperature water with certain heat energy.

[0003] The utility model discloses a novel steam boiler, it includes horizontal furnace body, the front end of furnace body is provided with combustion chamber, the rear end is provided with smoke chamber, the combustion chamber, smoke chamber and furnace body form the water cavity for storing water between, and the combustion chamber is communicated with the smoke chamber through the heat exchange pipe passing through the water cavity, the smoke chamber is connected with boiler flue gas condenser, and the heat exchange pipe is provided with the fin in and outside the pipe, solve the technical problem that the heat in flue gas cannot be absorbed.

[0004] The above-mentioned boiler cannot realize the uniform mixing of air and gas in multiple ways when in use, and cannot cool the flame, which is easy to cause the generation of NOx. In addition, the flame burning range is large, the flame arrangement is uneven, and the use effect is not ideal. SUMMARY

[0005] The purpose of the present application is to solve the above-mentioned problems and provide a multi-surface combustion water-cooled low-nitrogen burner, which can mix air and gas uniformly, ensure uniform flame arrangement, avoid local high temperature and reduce the generation of thermal NOx, and has compact overall structure, short flame and no need for large furnace, which can effectively reduce the overall size of the boiler.

[0006] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: a multi-surface combustion water-cooled low-nitrogen burner, comprising an air inlet assembly, a cyclone and a uniform gas chamber, the air inlet assembly comprises a fan, the cyclone comprises a gas inlet, air and gas enter the uniform gas chamber through the cyclone, the uniform gas chamber is arranged on one side of the furnace chamber, the furnace chamber is provided with a combustion chamber on the side close to the uniform gas chamber, the combustion chamber is provided with an ignition assembly on both sides, and the combustion chamber is provided with a smoke exhaust pipe.

[0007] Preferably, the air inlet assembly further comprises a wind distribution box and a variable diameter cylinder section, the fan, the wind distribution box and the variable diameter cylinder section are sequentially communicated, and the cyclone is arranged between the uniform gas chamber and the variable diameter cylinder section.

[0008] Preferably, the cyclone comprises an outer annular chamber, an intermediate annular chamber and an inner annular chamber, the outer annular chamber and the intermediate annular chamber are communicated by a first connecting pipe, the intermediate annular chamber and the inner annular chamber are communicated by a second connecting pipe, the outer wall of the outer annular chamber is provided with a gas inlet, the inner wall of the outer annular chamber is provided with a through hole, the intermediate annular chamber and the inner annular chamber are provided with a through hole, the intermediate annular chamber is communicated with the outer annular chamber through the first connecting pipe and the through hole, and the intermediate annular chamber is communicated with the inner annular chamber through the second connecting pipe and the through hole.

[0009] Preferably, one side of the cyclone is sealed and connected with the variable diameter cylinder segment through a flange, the other side is provided with a plurality of inclined flow guide plates, the cyclone is communicated with a uniform gas chamber on the side close to the flow guide plate, and the cross section of the uniform gas chamber is conical.

[0010] Preferably, the gas is arranged in the cyclone through the through hole and the through hole, the air is injected into the cyclone through the fan, and the gas and the air are mixed in the cyclone and then enter the uniform gas chamber through the flow guide plate.

[0011] Preferably, the burner further comprises a filter, a pressure reducing valve and a control valve group, and the filter, the pressure reducing valve and the control valve group are arranged on the cyclone.

[0012] Preferably, the combustion chamber is provided with a vertical air distribution plate on the side close to the uniform gas chamber, the middle of the air distribution plate is provided with a vertical middle partition plate, one side of the middle partition plate is connected with the inner wall of the hearth, and the other side penetrates through the air distribution plate and is welded with a circular pipe, the circular pipe is vertically welded in the hearth, and the middle partition plate divides the air distribution plate into left and right parts.

[0013] Preferably, the inner side of the air distribution plate is provided with a plurality of vertical finned pipes, the finned pipes are provided with circulating cooling water, a plurality of special-shaped corrugated plates are arranged between every two adjacent finned pipes, the two sides of the finned pipe are provided with transverse sections, the outermost special-shaped corrugated plate is welded with the finned pipe at the transverse section, and a gap is arranged between every two adjacent special-shaped corrugated plates.

[0014] Preferably, the surface of the air distribution plate is provided with a plurality of groups of air distribution holes, the air distribution holes are arranged in vertical lines, and the shapes of the air distribution holes are circular, oval or polygonal.

[0015] Preferably, the air distribution holes arranged in vertical lines correspond to the vertical finned pipes one by one, and each finned pipe is arranged right behind the air distribution hole.

[0016] The application discloses a multi-surface combustion water-cooled low-nitrogen combustor which comprises an air inlet assembly, a cyclone and a uniform gas chamber. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a main schematic view of the multi-surface combustion water-cooled low-nitrogen combustor.

[0018] Figure 2 It is a left schematic view of the multi-surface combustion water-cooled low-nitrogen combustor.

[0019] Figure 3 It is a bottom schematic view of the multi-surface combustion water-cooled low-nitrogen combustor.

[0020] Figure 4 It is a structure schematic view of the cyclone in the multi-surface combustion water-cooled low-nitrogen combustor. Figure 1 .

[0021] Figure 5 It is a structure schematic view of the cyclone in the multi-surface combustion water-cooled low-nitrogen combustor. Figure 2 .

[0022] Figure 6 It is a structure schematic view of the cyclone in the multi-surface combustion water-cooled low-nitrogen combustor. Figure 3 .

[0023] Figure 7 It is a structure schematic view of the air distribution plate in the multi-surface combustion water-cooled low-nitrogen combustor.

[0024] Figure 8 It is a connection schematic view of the finned tube and the special-shaped corrugated plate in the multi-surface combustion water-cooled low-nitrogen combustor.

[0025] Figure 9 It is an enlarged structure schematic view of A in the application. Figure 3

[0026] Figure 10 It is an enlarged structure schematic view of B in the application. Figure 8 ​​

[0027] Fig. 1, fan; 2, air distribution box; 3, variable diameter cylinder section; 4, cyclone; 41, outer annular cavity; 42, middle annular cavity; 43, inner annular cavity; 44, first connecting pipe; 45, second connecting pipe; 46, through hole; 47, through hole; 48, gas inlet; 49, flow guide plate; 5, filter; 6, pressure reducing valve; 7, control valve group; 8, air distribution chamber; 9, furnace; 10, combustion chamber; 101, middle partition plate; 102, air distribution plate; 1021, air distribution hole; 103, round pipe; 104, finned pipe; 105, special-shaped corrugated plate; 106, gap; 11, ignition assembly; 12, smoke exhaust pipe; 13, sight glass. DETAILED DESCRIPTION

[0028] The present application will now be described in further detail with reference to the drawings. The drawings are simplified schematic diagrams that only schematically illustrate the basic structure of the present application, and thus only show the components relevant to the present application.

[0029] Please refer to Figures 1-10 A multi-surface combustion water-cooled low-nitrogen combustor, comprising an air inlet assembly, a cyclone 4 and an air distribution chamber 8, the air inlet assembly comprising a fan 1, the cyclone 5 comprising a gas inlet 48, air and gas entering the air distribution chamber 8 through the cyclone 4, the air distribution chamber 8 being arranged on one side of the furnace 9, the furnace 9 being provided with a combustion chamber 10 on the side close to the air distribution chamber 8, both sides of the combustion chamber 10 being provided with an ignition assembly 11, and the combustion chamber 10 being provided with a smoke exhaust pipe 12.

[0030] In use, air enters the cyclone 4 through the air inlet assembly, gas enters the cyclone 4 at the gas inlet 48, and air and gas enter the air distribution chamber 8 after mixing in the cyclone 4, and finally enter the combustion chamber 10 of the furnace 9; at this time, the ignition assembly 11 is started, so that the mixed gas is burned in the combustion chamber 10; in the present application, finned pipes are arranged in the combustion chamber to cool the flame, which can effectively avoid local high temperature and reduce the generation of thermal NOx, and the low oxygen content in the flue gas improves the thermal efficiency of the boiler.

[0031] The air inlet assembly further comprises an air distribution box 2 and a variable diameter cylinder section 3, the fan 1, the air distribution box 2 and the variable diameter cylinder section 3 are sequentially communicated, and the cyclone 4 is arranged between the air distribution chamber 8 and the variable diameter cylinder section 3; the combustor further comprises a filter 5, a pressure reducing valve 6 and a control valve group 7, the filter 5, the pressure reducing valve 6 and the control valve group 7 are arranged on the cyclone 4, specifically on the gas inlet pipeline; the filter 5 is used to filter impurities in natural gas, and the pressure reducing valve 6 and the control valve group 7 are used to control the opening of natural gas.

[0032] In addition, the present application is also provided with a sight glass 13 on both sides of the combustion chamber, which is used to observe the flame and combustion condition in the combustion chamber 10.

[0033] In the embodiment, the variable diameter cylinder section 3, the cyclone 4 and the uniform gas chamber 8 form a combustion surface (combustion head), and three or more combustion surfaces can be derived based on the size or requirement of the boiler.

[0034] Please refer to Figures 4-6 , the cyclone 4 comprises an outer annular cavity 41, an intermediate annular cavity 42 and an inner annular cavity 43, the outer annular cavity 41 and the intermediate annular cavity 42 are communicated through a first connecting pipe 44, the intermediate annular cavity 42 and the inner annular cavity 43 are communicated through a second connecting pipe 45, the outer wall of the outer annular cavity 41 is provided with a gas inlet 48, the inner wall of the outer annular cavity 41 is provided with a through hole 46, the intermediate annular cavity 42 and the inner annular cavity 43 are provided with a through hole 47, the intermediate annular cavity 42 is communicated with the outer annular cavity 41 through the first connecting pipe 44 and the through hole 47, and the intermediate annular cavity 42 is communicated with the inner annular cavity 43 through the second connecting pipe 45 and the through hole 47.

[0035] That is, after the gas enters the outer annular cavity 41 from the gas inlet 48, the gas can enter the intermediate annular cavity 42 through the first connecting pipe 44, and the gas in the intermediate annular cavity 42 can enter the inner annular cavity 43 through the second connecting pipe 45; in addition, the gas in the outer annular cavity 41 can also overflow to the center at the through hole 46, and the gas in the intermediate annular cavity 42 and the inner annular cavity 43 can overflow to both sides through the through hole 47, and after overflowing, it can be uniformly distributed in the cyclone 4, so as to ensure uniform distribution of the gas.

[0036] Further, one side of the cyclone 4 is sealingly connected with the variable diameter cylinder section 3 through a flange, and the other side is provided with a plurality of inclined flow guide plates 49, the cyclone 4 is communicated with the uniform gas chamber 8 at the side close to the flow guide plates 49, the cross section of the uniform gas chamber 8 is conical, the gas is distributed in the cyclone 4 through the through hole 46 and the through hole 47, the air is injected into the cyclone 4 through the fan 1, and the gas and the air are mixed in the cyclone 4 and then enter the uniform gas chamber 8 through the flow guide plates 49.

[0037] As Figure 6 shown, the air and the gas are first preliminarily mixed in the cyclone 4, and then the mixed gas flows into the furnace through the uniform gas chamber 8.

[0038] In the scheme, the combustion chamber 10 is provided with a vertical air distribution plate 102 at the side close to the uniform gas chamber 8, the middle of the air distribution plate 102 is provided with a vertical intermediate partition plate 101, one side of the intermediate partition plate 101 is connected with the inner wall of the furnace, and the other side penetrates through the air distribution plate 102 and is welded with a circular pipe 103, and the circular pipe 103 is vertically welded in the furnace 9, wherein the purpose of the circular pipe 103 is to provide a welding surface to ensure stable connection of the intermediate partition plate, and the intermediate partition plate 101 divides the air distribution plate 102 into left and right parts, and the divided air distribution plate 102 corresponds to the combustion head.

[0039] Furthermore, the inner side of the air distribution plate 102 is provided with multiple vertically arranged finned tubes 104. Cooling water is circulated within each finned tube 104. The cooling water effectively reduces the flame temperature, avoids localized high temperatures, and reduces the generation of thermal NOx. Multiple irregularly shaped corrugated plates 105 are provided between each pair of adjacent finned tubes 104. The finned tubes 104 have cross-sections on both sides, and the outermost irregularly shaped corrugated plate 105 is welded to the finned tube 104 at the cross-section. A gap 106 is provided between each pair of adjacent irregularly shaped corrugated plates 105. See details below. Figure 10 .

[0040] The surface of the air distribution plate 102 is provided with multiple sets of air distribution holes 1021, which are arranged in a vertical line and can be circular, elliptical or polygonal in shape.

[0041] Please refer to it again. Figure 3 When the mixture of gas and air enters the furnace 9 through the gas equalization chamber 8, it is first blocked by the air distribution plate 102. Since the surface of the air distribution plate 102 is provided with air distribution holes 1021, the mixture will enter the air distribution plate 102 through the air distribution holes 1021 and then be burned. Since the air distribution holes 1021 are arranged in a vertical line, the flame of combustion will also be in a vertical line, avoiding the flame from being too long or concentrated.

[0042] In the present invention, the vertically arranged air distribution holes 1021 correspond one-to-one with the vertically erected finned tubes 104. Each finned tube 104 is located directly behind the air distribution hole 1021. The distance between the finned tube 104 and the air distribution plate 102 is the flame length of the mixed gas combustion.

[0043] In other words, the mixed gas will be blown towards the finned tube 104 through the air distribution hole 1021, meaning the combustion flame will also point towards the finned tube 104. Since the finned tube 104 is equipped with circulating cooling water, the circulating cooling water in the finned tube 104 can continuously reduce the flame temperature, thus ensuring that the flame is evenly distributed and does not generate local high temperatures. Moreover, the flame temperature is below 950°C, effectively suppressing the generation of NOx and achieving low-nitrogen environmental protection.

[0044] Compared to traditional diffusion burners, the multi-faceted burner of this invention ensures uniform flame distribution, effectively avoids localized high temperatures and reduces the generation of thermal NOx. Simultaneously, the lower oxygen content in the flue gas improves boiler thermal efficiency. Furthermore, the multi-head water-cooled low-NOx burner has a compact structure and short flame, eliminating the need for a large furnace, thus effectively reducing the overall boiler size and floor space. The triple air distribution system—including the cyclone separator 4, air distribution plate 102, and corrugated plate 105—ensures uniform mixing of air and fuel gas, facilitating combustion and reducing NOx generation.

[0045] Obviously, the above-mentioned embodiments are only examples for clearly illustrating the present application, but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations derived from the above description are still within the protection scope of the present application.

Claims

1. A multi-fuel combustion water-cooled low-NOx combustor, characterized by, The burner comprises an air inlet assembly, a cyclone and a uniform gas chamber, the air inlet assembly comprises a fan, the cyclone comprises a gas inlet, air and gas enter the uniform gas chamber through the cyclone, the uniform gas chamber is arranged on one side of a furnace, the furnace is provided with a combustion chamber on the side close to the uniform gas chamber, both sides of the combustion chamber are provided with an ignition assembly, and a smoke exhaust pipe is arranged in the combustion chamber. The cyclone comprises an outer annular cavity, an intermediate annular cavity and an inner annular cavity, the outer annular cavity and the intermediate annular cavity are communicated through a first connecting pipe, the intermediate annular cavity and the inner annular cavity are communicated through a second connecting pipe, the outer wall of the outer annular cavity is provided with a gas inlet, the inner wall of the outer annular cavity is provided with a through hole, the intermediate annular cavity and the inner annular cavity are provided with a through hole, the intermediate annular cavity is communicated with the outer annular cavity through the first connecting pipe and the through hole, and the intermediate annular cavity is communicated with the inner annular cavity through the second connecting pipe and the through hole.

2. The multi-fuel, water-cooled, low NOx combustor of claim 1, wherein, The air inlet assembly further comprises a wind distribution box and a variable-diameter cylinder section, the fan, the wind distribution box and the variable-diameter cylinder section are sequentially communicated, and the cyclone is arranged between the uniform gas chamber and the variable-diameter cylinder section.

3. The multi-fuel, water-cooled, low NOx combustor of claim 2, wherein, One side of the cyclone is sealingly connected with the variable-diameter cylinder section through a flange, the other side is provided with a plurality of inclined flow guide plates, the cyclone is communicated with the uniform gas chamber on the side close to the flow guide plates, and the cross section of the uniform gas chamber is conical.

4. The multi-fuel, water-cooled, low NOx combustor of claim 3, wherein, The gas is arranged in the cyclone through the through hole and the through hole, the air is injected into the cyclone through the fan, and the gas and the air are mixed in the cyclone and then enter the uniform gas chamber through the flow guide plates.

5. The multi-fuel fired water-cooled low-NOx combustor of any of claims 1-4, wherein, The burner further comprises a filter, a pressure reducing valve and a control valve group, and the filter, the pressure reducing valve and the control valve group are arranged on the cyclone.

6. The multi-fuel, water-cooled, low NOx combustor of claim 1, wherein, The combustion chamber is provided with a vertical wind distribution plate on the side close to the uniform gas chamber, the middle of the wind distribution plate is provided with a vertical middle partition plate, one side of the middle partition plate is connected with the inner wall of the furnace, and the other side of the middle partition plate is welded with a circular pipe through the wind distribution plate, the circular pipe is vertically welded in the furnace, and the middle partition plate divides the wind distribution plate into left and right parts.

7. The multi-fuel, water-cooled, low NOx combustor of claim 6, wherein, The inner side of the wind distribution plate is provided with a plurality of vertical fin tubes, the fin tubes are provided with circulating cooling water, a plurality of special-shaped corrugated plates are arranged between every two adjacent fin tubes, both sides of the fin tube are provided with a transverse section, the outermost special-shaped corrugated plate is welded with the fin tube at the transverse section, and a gap is arranged between every two adjacent special-shaped corrugated plates.

8. The multi-fuel, water-cooled, low NOx combustor of claim 7, wherein, The surface of the wind distribution plate is provided with a plurality of groups of air distribution holes, the air distribution holes are arranged in vertical lines, and the air distribution holes are circular, elliptical or polygonal in shape.

9. The multi-fuel, water-cooled, low NOx combustor of claim 8, wherein, The air distribution holes arranged in vertical lines correspond to the vertical fin tubes one by one, and each fin tube is arranged behind the air distribution hole.

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