Full-premixing negative pressure type combustion rod, combustor and steam boiler

Abstract

The full-premixing negative pressure type combustion rod comprises an inner sleeve and an outer sleeve, one end of the inner sleeve is closed, the other end of the inner sleeve is open, a plurality of first grooves facing outwards in the radial direction are formed in the outer surface of the inner sleeve, and gas through holes are formed in the first grooves; the inner sleeve is communicated with the fuel gas premixing chamber through a premixed fuel gas conveying pipe; the outer sleeve is a metal fiber net pipe, is fixedly arranged on the inner sleeve in a sleeving mode, is close to the open end of the inner sleeve and covers all the gas through holes. The full-premixing negative pressure type combustion rod can prevent combustion residual particles from blocking gaps of the metal fiber net pipe, guarantees combustion intensity and efficiency, and can remarkably prolong the service life of the combustion rod.

Description

TECHNICAL FIELD

[0001] The utility model relates to a thermal equipment technical field, especially a full premixing negative pressure type combustion stick, combustor and steam boiler. BACKGROUND

[0002] Steam is widely used as a kind of energy, steam is generally generated by steam boiler, steam boiler releases heat through fuel combustion in the furnace to heat the liquid water in the pot to vaporize into steam. Water is continuously heated in the pot, the temperature is raised to form steam, at the same time, due to the sealing property of the furnace body, the expansion of steam in the pot is limited to generate pressure and then form pressure steam, that is, the boiler water vapor is saturated water vaporized by heating water in the pot body at constant pressure.

[0003] At present, the furnace head of conventional steam boiler adopts metal fiber combustor, the metal fiber combustor belongs to premixed gas surface combustion, the uniformly premixed gas air mixture flows to the head of the combustor and burns on the surface layer of the metal fiber fabric with uniform air permeability.

[0004] The metal fiber or metal wire mesh combustor of conventional steam boiler ignites the premixed gas after passing through the metal mesh gap in the combustion chamber, there is certain resistance in the gas flow channel, the combustion intensity is not enough when the boiler operates at high heat load, and the combustion efficiency is not ideal; in addition, the nitrogen oxides and sulfur dioxide particles generated by the premixed gas combustion will be partially left at the combustion head position, and the metal mesh gap may be blocked after long-term work of the combustor, resulting in uneven combustion distribution, reduced combustion intensity and efficiency, and even causing the risk of combustor burning accident in extreme cases. CONTENT OF THE UTILITY MODEL

[0005] The application provides a full premixing negative pressure type combustion stick and combustor, which solves or partially solves the technical problems of metal mesh gap blockage, insufficient combustion intensity and low combustion efficiency of the combustion stick of the gas boiler in the prior art.

[0006] The full premixing negative pressure type combustion stick provided by the application comprises an inner sleeve and an outer sleeve,

[0007] One end of the inner sleeve is closed, the other end is open, a plurality of first grooves radially outward are arranged on the outer surface, and a gas through hole is arranged in the first groove; the inner sleeve is connected with the gas premixing chamber through a premixed gas conveying pipe;

[0008] The outer sleeve is a metal fiber mesh pipe, which is fixed on the inner sleeve and covers all the gas through holes near the open end of the inner sleeve.

[0009] Preferably, the inner sleeve is bent into a ring column shape by a metal plate;

[0010] The first groove can be replaced by a first pit, that is, the outer wall of the inner sleeve at the position of the first groove is a pit, and the inner wall is a protrusion; the first pit is made by stamping the metal plate.

[0011] As preferred, the shape of the gas passage hole includes but is not limited to triangle, quadrilateral, circle, oblong, heart, star;

[0012] The ratio of the projection area of the gas passage hole to the first groove is (10-80) %.

[0013] As preferred, the ratio of the depth of the first groove to the wall thickness of the inner sleeve is (30-80) %.

[0014] The ratio of the total projection area of all the first grooves to the entire inner wall development area of the outer sleeve is (40-90) %.

[0015] The shape of the first groove includes but is not limited to circular arc.

[0016] As preferred, the outer surface of the inner sleeve is further provided with a plurality of radially outward second grooves; the shape of the second groove includes but is not limited to rectangle.

[0017] The second groove can be replaced by a second pit, that is, the outer wall of the inner sleeve at the position of the second groove is a pit, and the inner wall is a protrusion; the second pit is made by stamping the metal plate.

[0018] Based on the same invention, the application further provides a full premixing high-efficiency burner, comprising: a fan, a Venturi, an air delivery pipe, a gas delivery pipe, a slow-opening electromagnetic valve, a premixing chamber, a full premixing negative pressure type combustion rod,

[0019] The inlet of the fan is connected to the diffusion section of the Venturi, and the outlet is connected to the premixing chamber.

[0020] The premixing chamber is communicated with the open end of the inner sleeve of the full premixing negative pressure type combustion rod.

[0021] The inlet section of the Venturi is communicated with the air delivery pipe, and the throat of the Venturi is communicated with the gas delivery pipe.

[0022] The slow-opening electromagnetic valve is arranged on the gas delivery pipe.

[0023] As preferred, a controller is further included, which is electrically connected with the slow-opening electromagnetic valve and the fan, and the controller controls the slow-opening electromagnetic valve to adjust to a set opening degree after receiving the wind speed information of the fan.

[0024] Based on the same invention, the application further provides a full premixing steam boiler comprising the full premixing high-efficiency burner.

[0025] The one or more technical solutions provided in the embodiments of the application have at least the following technical effects or advantages:

[0026] The full premixing negative pressure type combustion rod adopts the form of a gas through hole arranged in the groove. The premixing gas is released from the metal fiber mesh tube gap after passing through the gas through hole and the first groove, and then burns. The premixing gas generates a negative pressure effect at the position of the first groove after passing through the gas through hole. On the one hand, the through property of the premixing gas in the through hole is enhanced. On the other hand, the combustion flue gas around the gas through hole is continuously sucked, and the flue gas heat energy is increased. At the same time, the first groove increases the space between the inner sleeve and the outer sleeve, avoids the combustion residual particulate matter from blocking the gap of the metal fiber mesh tube, guarantees the combustion intensity and efficiency, and significantly prolongs the service life of the combustion rod.

[0027] The full premixing high-efficiency burner is provided with a fan, a Venturi, an air delivery pipe, a gas delivery pipe, a slow-opening electromagnetic valve, a premixing chamber, and a full premixing negative pressure type combustion rod. Through the Venturi effect, the negative pressure generated in the throat when the fan sucks in air can suck in natural gas. After being sucked in, the mixed gas of natural gas and air gradually diffuses laterally in the diffusion section of the Venturi, promotes the mixing of the two kinds of gas, ensures the uniformity of the mixed fuel, avoids the ignition failure or explosion problem caused by uneven mixing of the gas, and adjusts the valve opening degree of the slow-opening electromagnetic valve according to the air speed of the fan. After the best mixing ratio of the gas and air is determined through practice, the slow-opening electromagnetic valve takes the best mixing ratio as the set value to cooperate with the fan to adjust the valve opening degree. The gas and air in the mixed gas can be accurately controlled to have the best mixing ratio, so that the mixed gas can be fully burned, the combustion efficiency is improved, and the content of harmful substances such as nitrogen oxides and sulfur dioxide in the exhaust gas is reduced. That is, the combustion efficiency is improved, and the environmental protection performance is also improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A structural schematic diagram of the full premixing high-efficiency burner provided in the embodiments of the application is shown in the figure.

[0029] Figure 2 A structural schematic diagram of the full premixing negative pressure type combustion rod provided in the embodiments of the application is shown in the figure.

[0030] Figure 3 A structural schematic diagram of the inner sleeve (only the first groove, and the first groove adopts the groove form) in the full premixing negative pressure type combustion rod provided in the embodiments of the application is shown in the figure.

[0031] Figure 4 A structural schematic diagram of the inner sleeve (only the first groove, and the first groove adopts the groove form) in the full premixing negative pressure type combustion rod provided in the embodiments of the application is shown in the figure. Figure 3 A structural schematic diagram of the inner sleeve (only the first groove, and the first groove adopts the groove form) in the full premixing negative pressure type combustion rod provided in the embodiments of the application is shown in the figure.

[0032] Figure 5 is a structural left view of Figure 4 ;

[0033] Figure 6 is a structural top view of Figure 4 ;

[0034] Figure 7 is a left view of a plane structure of the inner sleeve pipe (only the first groove, and the first groove adopts a pit form) of the full premixing negative pressure type combustion rod provided by the embodiment of the present application after unfolding;

[0035] Figure 8 is a structural schematic view of the inner sleeve pipe (containing the first groove and the second groove) of the full premixing negative pressure type combustion rod provided by the embodiment of the present application;

[0036] Figure 9 is a plane structural schematic view after unfolding; Figure 8 ;

[0037] Figure 10 is a left view of a plane structure of the inner sleeve pipe (containing the first groove and the second groove) of the full premixing negative pressure type combustion rod provided by the embodiment of the present application after unfolding;

[0038] Figure 11 is a schematic view of a square gas through hole; Figure 4 ;

[0039] Figure 12 is a schematic view of a circular gas through hole; Figure 4 ;

[0040] Figure 13 is a structural diagram of a Chinese Venturi; Figure 1 ;

[0041] The components represented by the respective labels in the drawings are as follows:

[0042] 1 inner sleeve pipe, 2 outer sleeve pipe, 3 first groove, 4 gas through hole, 5 second groove, 10 full premixing negative pressure type combustion rod, 20 fan, 30 Venturi, 40 air conveying pipe, 50 slow-opening electromagnetic valve, 60 gas conveying pipe, 7 full premixing device. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0044] Reference is made to the drawingsFigure 2 and 3 The full premix negative pressure combustion rod of the present application comprises an inner sleeve 1 and an outer sleeve 2. The inner sleeve 1 is closed at one end and open at the other end, and a plurality of radially outward circular-arc-shaped first grooves 3 are arranged on the outer surface of the inner sleeve 1. Triangular gas through holes 4 are arranged in the first grooves 3. The inner sleeve 1 is connected to a gas premixing chamber through a premix gas delivery pipe.

[0045] Referring to the accompanying drawings Figures 3 to 6 The inner sleeve 1 is bent into a ring column shape by a metal plate. Figure 7 The first grooves 3 can be replaced by first pits, i.e., the outer wall of the inner sleeve 1 is in the form of a pit, and the inner wall is in the form of a protrusion. The design of the first pit protrusion structure can generate a flow disturbance effect on the flow state of the premix gas in the inner sleeve 1, improve the passability of the premix gas in the gas through holes, and thus improve the combustion efficiency. The first pit is made by stamping a metal plate.

[0046] The shape of the gas through holes 4 includes but is not limited to triangle, quadrilateral, circle, oval, heart, and star. The ratio of the projection area of the gas through holes 4 to the first grooves 3 is 40%. The ratio of the depth of the first grooves 3 to the wall thickness of the inner sleeve 1 is 50%. The ratio of the total projection area of all the first grooves 3 to the entire inner wall development area of the outer sleeve 2 is 60%.

[0047] Referring to the accompanying drawings Figures 8 to 10 The outer surface of the inner sleeve 1 is also provided with a plurality of radially outward rectangular second grooves 5. Figure 10 The second grooves 5 can be replaced by second pits, i.e., the outer wall of the inner sleeve 1 at the position of the second grooves 5 is in the form of a pit, and the inner wall is in the form of a protrusion. The design of the second pit protrusion structure can also generate a flow disturbance effect on the flow state of the premix gas in the inner sleeve 1, improve the passability of the premix gas in the gas through holes 4, and thus improve the combustion efficiency. The second pit is made by stamping a metal plate. The arrangement of the second grooves 5 can also increase the space between the inner sleeve 1 and the outer sleeve 2, avoid the blockage of the gaps of the metal fiber mesh tube by combustion residual particulate matter, ensure the combustion intensity and efficiency, and significantly prolong the service life of the combustion rod.

[0048] Referring to the accompanying drawings Figure 1 and 13The application further provides a full premixing high-efficiency burner, comprising: a fan 20, a Venturi 30, an air delivery pipe 40, a gas delivery pipe 60, a slow-opening electromagnetic valve 50, a premixing chamber, and a full premixing negative pressure type combustion rod 10; the inlet of the fan 20 is connected to the diffuser section of the Venturi 30, and the outlet is connected to the premixing chamber; the premixing chamber is communicated with the open end of the inner sleeve 1 of the full premixing negative pressure type combustion rod; the inlet section of the Venturi 30 is communicated with the air delivery pipe 40, and the throat of the Venturi 30 is communicated with the gas delivery pipe 60; the slow-opening electromagnetic valve 50 is arranged on the gas delivery pipe 60. The full premixing high-efficiency burner further comprises a controller, which is electrically connected with the slow-opening electromagnetic valve 50 and the fan 20, and controls the slow-opening electromagnetic valve 50 to adjust to a set opening degree after receiving the wind speed information of the fan 20.

[0049] Based on the same invention, the application further provides a full premixing steam boiler, comprising the full premixing high-efficiency burner.

[0050] The working principle of the full premixing high-efficiency burner is as follows: gas enters the slow-opening electromagnetic valve 50, the valve opening degree of the slow-opening electromagnetic valve 50 is controlled according to the wind speed of the fan 20, then the gas is sent into the Venturi 30, the air and the gas are uniformly mixed in the Venturi 30, and then the mixed gas is sent into the full premixing negative pressure type combustion rod 10 by the fan 20, so as to ignite and burn on the surface of the full premixing negative pressure type combustion rod 10, the heat generated by the burning makes the water in the pressure-bearing outer shell of the full premixing steam boiler boil to generate steam, and the steam is gathered at the top of the pressure-bearing outer shell and forms high-temperature steam after being pressurized. The full premixing steam boiler can improve the thermal efficiency by 8-20%, thereby saving the consumption of natural gas, and the harmful components such as nitrogen oxides, sulfur dioxide and particulate matter in the exhaust gas after burning can be reduced to 10mg / m 3 , and has good environmental protection performance.

[0051] The above specific embodiments further specifically describe the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above description is only a specific embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A fully premixed negative pressure combustion rod, characterized by, The inner sleeve and the outer sleeve are provided, The inner sleeve is closed at one end and open at the other end, and a plurality of first grooves are arranged on the outer surface of the inner sleeve in a radial direction outward, and a gas passage hole is arranged in the first groove; the inner sleeve is connected to the gas premixing chamber through the premixed gas delivery pipe; The outer sleeve is a metal fiber mesh pipe, which is sleeved and fixed on the inner sleeve, covers all the gas passage holes, and is close to the open end of the inner sleeve.

2. The fully premixed negative pressure combustion rod according to claim 1, wherein The inner sleeve is bent into a ring column shape by a metal plate; The first groove can be replaced by a first pit, and the first pit is made by stamping the metal plate.

3. The fully premixed negative pressure combustion rod according to claim 1, wherein The shape of the gas passage hole includes but is not limited to triangle, quadrilateral, circle, oval, heart shape and star shape. The ratio of the projection area of the gas passage hole to the first groove is (10-80) %.

4. The fully premixed negative pressure combustion rod according to claim 1, wherein The ratio of the depth of the first groove to the wall thickness of the inner sleeve is (30-80) %. The ratio of the total projection area of all the first grooves to the entire inner wall area of the outer sleeve is (40-90) %. The shape of the first groove includes but is not limited to circular arc shape.

5. The fully premixed negative pressure combustion rod according to claim 2, wherein The outer surface of the inner sleeve is further provided with a plurality of second grooves in a radial direction outward; the shape of the second groove includes but is not limited to rectangle. The second groove can be replaced by a second pit, and the second pit is made by stamping the metal plate.

6. A fully premixed high efficiency burner characterized by, The fan, the Venturi, the air delivery pipe, the gas delivery pipe, the slow-opening electromagnetic valve, the premixing chamber, the full premixing negative pressure type combustion rod according to any one of claims 1-5, The inlet of the fan is connected to the diffuser section of the Venturi, and the outlet is connected to the premixing chamber; The premixing chamber is connected to the open end of the inner sleeve of the full premixing negative pressure type combustion rod; The inlet section of the Venturi is connected to the air delivery pipe, and the throat of the Venturi is connected to the gas delivery pipe; The slow-opening electromagnetic valve is arranged on the gas delivery pipe. The controller is further provided, and the controller is electrically connected with the slow-opening electromagnetic valve and the fan; the controller receives the wind speed information of the fan and controls the slow-opening electromagnetic valve to adjust to a set opening degree.

7. The all-premixed high-efficiency burner of claim 6, wherein, The full premixing high-efficiency burner according to claim 6 or 7 is further provided.

8. A fully premixing steam boiler, characterized by ​

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