Hydrogen ignition burner and burner using the same

Abstract

The present invention provides a hydrogen ignition burner and a burner using the burner, which relates to the field of burner technology. The main purpose is to solve the problems of unstable flame combustion and incomplete combustion in the existing plasma ignition technology and micro-oil combustion technology, and to provide a hydrogen ignition burner structure that is safe to use and can stably burn under low-load conditions. The hydrogen ignition burner includes: a gas pipe, the gas pipe includes a stabilizing pipe and a main combustion pipe, the number of the stabilizing pipe is one, the main combustion pipe is wound around the outer periphery of the stabilizing pipe, and a gap is left between the main combustion pipe and the stabilizing pipe; a cylinder, an equilibrating disk and a stabilizing disk are sequentially arranged in the cylinder along its axial direction, and a plurality of holes are provided in the thickness direction of the equilibrating disk and the stabilizing disk. The gas pipe is inserted into the cylinder through the holes, and there are gaps between the gas pipe and the equilibrating disk and the stabilizing disk.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, in particular to a hydrogen ignition burner and a burner using the burner. Background Art

[0002] With the continuous adjustment and deepening of China's energy structure, the installed capacity of renewable energy in my country has increased annually. To date, seasonal and intermittent clean power sources such as hydropower and wind power have continued to grow rapidly. However, this continued rapid growth in renewable energy has also led to serious wind and solar curtailment in some regions. For coal-fired power generation units, to better meet the requirements of deep peak shaving and improve operational safety and reliability, further optimization and retrofitting are necessary. Initially, these improvements require stable combustion at low loads and low SCR inlet flue gas temperatures. To further enhance the boiler's low-load stable combustion capabilities and achieve deep peak shaving of up to 20% of rated load using conventional coal quality, improvements are currently being made to existing plasma ignition burners and low-oil ignition burners. This is accompanied by modifications to the corresponding burners, hot primary air flue gas mixing, hot primary air heaters, and dynamic separators to meet these requirements.

[0003] Plasma ignition and stable combustion technology uses high-temperature plasma as an ignition source to achieve cold-start and stable combustion at low loads. However, due to the limited energy of the plasma ignition source, plasma ignition technology has high requirements for coal quality. Fluctuations in coal quality can easily lead to flame instability, necessitating the addition of oil to aid combustion. Furthermore, plasma ignition technology is subject to arc interruption and short cathode and anode lifespans, necessitating regular replacement. Poor coal quality also results in low burnout rates, necessitating frequent soot blowing from the air preheater. Micro-oil combustion technology uses a micro-oil gun as an ignition source to achieve cold-start and stable combustion at low loads. Micro-oil ignition technology offers adjustable fuel output and is adaptable to a wider range of coal types than plasma ignition technology. However, the micro-oil ignition process can lead to incomplete oil combustion, posing a significant safety hazard to equipment such as electrostatic precipitators.

[0004] In order to solve the above problems and achieve stable combustion under low-load conditions while meeting the deep peak regulation requirements of the unit, it is necessary to develop a new type of ignition burner structure. Summary of the Invention

[0005] The present invention aims to provide a hydrogen ignition burner and a burner using the same to address the inconvenience of using plasma burners and micro-oil burners in the prior art. The various technical solutions provided by the present invention, including the preferred solution, are described below.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The hydrogen ignition burner provided by the present invention comprises:

[0008] A gas pipe, comprising a flame stabilizing pipe and a main flame pipe, wherein the number of the flame stabilizing pipe is one, and the main flame pipe is wound around the periphery of the flame stabilizing pipe with a gap left between the main flame pipe and the flame stabilizing pipe;

[0009] The cylinder body comprises a dividing plate and a flame stabilizing plate arranged in sequence along its axial direction, and a plurality of holes are provided in the thickness direction of the dividing plate and the flame stabilizing plate. The gas pipe is inserted into the cylinder body through the holes, and there is a gap between the gas pipe and the dividing plate and the flame stabilizing plate.

[0010] When using this hydrogen ignition burner, the outer periphery of the stabilizing tube directly contacts the combustion-supporting gas, helping to achieve stable hydrogen combustion. Simultaneously, the main combustion tube, located outside the stabilizing tube, helps increase hydrogen concentration. The high temperature generated by the flame burning in the stabilizing tube further ignites the hydrogen in the main combustion tube. This structure facilitates the implementation of centrally stabilized combustion, multi-stage combustion, and graded air distribution, resulting in a stable, rigid, and high-temperature torch while achieving hydrogen combustion.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] As a further improvement of the present invention, the cylinder body includes a combustion-supporting air cylinder and a hydrogen cylinder in sequence along its axial direction; the hydrogen cylinder is provided with a hydrogen inlet connected to the gas pipe, and hydrogen flows into the gas pipe through the hydrogen inlet; a combustion-supporting gas inlet is provided on the side of the combustion-supporting air cylinder close to the hydrogen cylinder, and the combustion-supporting gas flows into the combustion-supporting air cylinder through the combustion-supporting gas inlet and can flow through the equalizing disk and the stabilizing flame disk in sequence to the other end of the combustion-supporting air cylinder.

[0013] The cylinder includes a combustion-supporting air cylinder and a hydrogen cylinder that are designed separately and combined together, so it can be ensured that the hydrogen and combustion-supporting gas injected into the cylinder will only come into contact at the designed combustion point, thereby effectively preventing the burner from deigning. In addition, the above design can also help the combustion-supporting gas to be evenly distributed in the combustion-supporting air cylinder, so that a stable, long-burning flame can be formed at the end of the stable combustion tube, avoiding the problem of unstable combustion.

[0014] As a further improvement of the present invention, there are multiple main combustion pipes and all of the main combustion pipes are arranged around the outer periphery of the combustion stabilizing pipe.

[0015] At this time, multiple main combustion pipes are evenly arranged around the stabilizing combustion pipe, so that the hydrogen flow guided through the main combustion pipes can be fully mixed with the combustion-supporting gas and achieve efficient combustion.

[0016] As a further improvement of the present invention, the number of the main combustion pipes is 4 to 12. If the number of the main combustion pipes is too small, the uniform distribution of hydrogen will be affected, while if the number of the main combustion pipes is too large, the volume of the equipment and the safety of use will be affected.

[0017] As a further improvement of the present invention, the number of the main combustion pipe is one and the main combustion pipe is annular in structure, and the main combustion pipe and the stabilizing combustion pipe are coaxially arranged.

[0018] The main combustion tube formed by this structural design is sleeved outside the stabilizing tube, thereby forming an annular hydrogen flow outside the stabilizing tube. The hydrogen and the combustion-supporting gas can be evenly mixed together and ignited by the flame at the stabilizing tube.

[0019] As a further improvement of the present invention, the main combustion pipe is provided with an exhaust hole at one end portion and / or an outer edge close to the combustion stabilizing disk, and the number of the exhaust holes is multiple.

[0020] This structure can further enable the hydrogen gas flow derived from the main combustion pipe to be fully mixed with the combustion-supporting gas.

[0021] As a further improvement of the present invention, the end portion of the combustion stabilizing tube is retracted into the cylinder relative to the end portion of the main combustion tube.

[0022] This structure allows the end of the stabilizing tube to fully contact the surrounding combustion-supporting gas, forming a stable flame and ensuring stable combustion. This creates a stable combustion zone at the end of the stabilizing tube. When the flame formed in this stable combustion zone contacts the hydrogen discharged from the main combustion tube, the corresponding hydrogen is ignited, forming a main combustion zone in front of the main combustion tube.

[0023] As a further improvement of the present invention, there is a gap between the gas pipe and the inner side wall of the cylinder. This gap structure can be used to ensure that there is sufficient combustion-supporting gas at the main combustion pipe to avoid affecting the combustion of hydrogen at the main combustion pipe.

[0024] As a further improvement of the present invention, the cylinder is further provided with an ignition device and / or a flame monitoring device, which is used to be connected to a corresponding control device and monitor whether a flame exists.

[0025] The present invention also provides a burner including any of the above-mentioned hydrogen ignition burners. Compared with conventional burners, the burner using the hydrogen ignition burner can achieve full combustion of pulverized coal, achieving the purpose of first-stage low-load stable combustion during ignition and startup of pulverized coal boilers.

[0026] Compared with the prior art, the hydrogen ignition burner provided by the preferred embodiment of the present invention adopts the method of central stable combustion, multi-stage combustion and first-level graded air distribution to achieve the purpose of low-load stable combustion. When in use, since the flow rate at the hydrogen nozzle is much greater than the propagation speed of the hydrogen flame, the burner will not have problems such as deflagration and flashback. At the same time, since the outer periphery of the stable combustion tube is arranged with an annular space for the circulation of combustion-supporting gas, it can ensure that the end of the stable combustion tube can form a stable long-burning flame, thereby solving the problems of flameout and unstable combustion that may occur in the burner. The main combustion tube located on the outer periphery of the stable combustion tube can help form a flame with high efficiency. The burner using this burner can ignite coal powder efficiently, and has the advantages of large ignition energy, wide adaptability to coal quality, and high burnout rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 or the description of the prior art. 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.

[0028] Figure 1 It is a schematic cross-sectional structure diagram of the hydrogen ignition burner of the present invention;

[0029] Figure 2 It is a schematic structural diagram of the equalizing plate in the hydrogen ignition burner of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the combustion stabilizing disk in the hydrogen ignition burner of the present invention;

[0031] Figure 4 This is a structural diagram of an embodiment of the main combustion tube in the hydrogen ignition burner of the present invention;

[0032] Figure 5 This is a structural schematic diagram of another embodiment of the main combustion tube in the hydrogen ignition burner of the present invention;

[0033] Figure 6 It is a schematic diagram of ignition of the hydrogen ignition burner of the present invention.

[0034] In the figure: 1. Gas pipe; 11. Flame stabilizing pipe; 12. Main combustion pipe; 121. Exhaust hole; 2. Cylinder; 21. Combustion-supporting air duct; 211. Combustion-supporting gas inlet; 22. Hydrogen cylinder; 221. Hydrogen inlet; 3. Equalizing plate; 4. Flame stabilizing plate; 5. Ignition device; 6. Flame monitoring device; 7. Flame stabilizing zone. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0037] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0038] Attachment Figure 1 It is a schematic diagram of the cross-sectional structure of the hydrogen ignition burner of the present invention; it can be seen that the burner is a bar-shaped structure as a whole, the right end of which is used for air intake and ignition, and hydrogen and combustion-supporting gas are transported to the left end through the burner and can be ignited there.

[0039] Attachment Figure 2 This is a schematic diagram of the structure of the equalizing plate in the hydrogen ignition burner of the present invention, Figure 3 It is a structural schematic diagram of the stabilizing disk in the hydrogen ignition burner of the present invention; the balancing disk and the stabilizing disk are both flat circular sheet structures with multiple holes provided thereon, and the gas pipe is passed through the balancing disk and the stabilizing disk through the above holes; in addition, the balancing disk and the stabilizing disk are also provided with gaps for the combustion-supporting gas to pass through.

[0040] Attachment Figure 4This is a structural schematic diagram of an embodiment of the main combustion tube in the hydrogen ignition burner of the present invention; at this time, the main combustion tube is a columnar structure as a whole, one end of which is connected to the hydrogen cylinder, and the other end is provided with multiple exhaust holes. Hydrogen enters the main combustion tube from the hydrogen cylinder and can be discharged through the exhaust holes.

[0041] Attachment Figure 5 Schematic diagram of another embodiment of the main combustion tube in the hydrogen ignition burner of the present invention; Figure 4 In comparison, the main combustion pipe is now an annular structure, and the whole is similar to a sleeve.

[0042] Attachment Figure 6 This is a schematic diagram of the ignition of the hydrogen ignition burner of the present invention; at this time, the arrow in the figure points to the direction of gas flow in the fuel gas pipe, and the flame formed by the combustion of hydrogen is formed at the location of the arrow.

[0043] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] The present invention provides a hydrogen ignition burner, comprising a gas pipe 1 and a cylinder 2, wherein the gas pipe 1 comprises a stabilizing flame pipe 11 and a main flame pipe 12, the number of the stabilizing flame pipe 11 is one, the main flame pipe 12 is arranged around the outer periphery of the stabilizing flame pipe 11, and a gap is left between the main flame pipe 12 and the stabilizing flame pipe 11; an averaging disk 3 and a stabilizing flame disk 4 are sequentially arranged in the cylinder 2 along its axial direction, and a plurality of holes are provided in the thickness direction of the averaging disk 3 and the stabilizing flame disk 4, the gas pipe 1 is inserted into the cylinder 2 through the holes, and there are gaps between the gas pipe 1 and the averaging disk 3 and the stabilizing flame disk 4.

[0045] When using the hydrogen ignition burner, the outer periphery of the stabilizing tube 11 can directly contact the combustion-supporting gas and achieve stable combustion of hydrogen with the help of the combustion-supporting gas. At the same time, the main combustion tube 12 distributed outside the stabilizing tube 11 can help increase the hydrogen concentration. At this time, the high temperature generated by the flame combustion in the stabilizing tube 11 can further ignite the hydrogen in the main combustion tube 12. The above structure can conveniently achieve the effects of central stable combustion, multi-stage combustion, and graded air distribution, thereby achieving hydrogen combustion while forming a stable torch with strong rigidity and high temperature.

[0046] Example 1:

[0047] The present invention provides a hydrogen ignition burner, comprising a cylinder 2 and a gas pipe 1 located inside the cylinder 2. Figure 1As shown, the cylinder 2 includes a combustion-supporting air cylinder 21 and a hydrogen cylinder 22 in sequence along its axial direction; the hydrogen cylinder 22 is provided with a hydrogen inlet 221 connected to the gas pipe 1, and the ignition device 5 is fixedly arranged on the hydrogen cylinder 22, and hydrogen flows into the gas pipe 1 through the hydrogen inlet 221; a combustion-supporting gas inlet 211 is provided on the side of the combustion-supporting air cylinder 21 close to the hydrogen cylinder 22, and the combustion-supporting gas flows into the combustion-supporting air cylinder 21 through the combustion-supporting gas inlet 211 and can flow through the equalizing plate 3 and the stabilizing flame plate 4 in sequence to the other end of the combustion-supporting air cylinder 21.

[0048] The cylinder 2 includes a combustion-supporting air cylinder 21 and a hydrogen cylinder 22 that are designed separately and combined together, so it can be ensured that the hydrogen and combustion-supporting gas injected into the cylinder 2 will only come into contact at the designed combustion point, thereby effectively preventing the burner from deigning; in addition, the above design can also help the combustion-supporting gas to be evenly distributed in the combustion-supporting air cylinder 21, so that a stable long-burning flame can be formed at the end of the stable combustion tube 11, avoiding the problem of unstable combustion.

[0049] Specifically, the above-mentioned evenly distributing plate 3 and the combustion stabilizing plate 4 are both located in the combustion-supporting air duct 21 and arranged in sequence along the axis of the combustion-supporting air duct 21. The holes located on the evenly distributing plate 3 or the combustion stabilizing plate 4 can be arranged in an annular shape, and the shape of the above-mentioned holes can be circular or other similar structures.

[0050] The structures of the evenly distributing plate 3 and the stable combustion plate 4 can be as follows: Figure 2-3 As shown. Figure 2-3 The number, shape, and size of the holes are for illustration only. The relatively large holes are used for the gas pipe 1 to pass through, and the remaining relatively small holes are used for the combustion-supporting gas to circulate. When the gas pipe 1 is inserted into the cylinder 2 through the holes, there are gaps or spaces between the gas pipe 1 and the corresponding holes or the corresponding cylinder 2 for the combustion-supporting gas to circulate. The combustion-supporting gas that enters the combustion-supporting air duct 21 through the combustion-supporting gas inlet 211 can flow through the gaps or spaces to the left side of the gas pipe 1 (see FIG. 2 ). Figure 1 ).

[0051] As an optional embodiment, there are multiple main combustion pipes 12 and all the main combustion pipes 12 are wound around the outer periphery of the combustion stabilizing pipe 11 .

[0052] At this time, the plurality of main combustion pipes 12 are evenly arranged around the stabilizing combustion pipe 11, so that the hydrogen gas flow led out through the main combustion pipes 12 can be fully mixed with the combustion-supporting gas and achieve efficient combustion.

[0053] As an optional embodiment, the number of the main combustion pipes 12 is 4 to 12. If the number of the main combustion pipes 12 is too small, the uniform distribution of hydrogen will be affected, while if the number of the main combustion pipes 12 is too large, the volume of the equipment and the safety of use will be affected.

[0054] In order to ensure that the main hydrogen gas flow can be fully mixed with the combustion-supporting gas (which can be air, etc.) and burn efficiently during use, as an optional embodiment, Figure 4 As shown, at this time, an exhaust hole 121 is provided at one end portion and / or outer edge of the main combustion pipe 12 close to the combustion stabilizing disk 4, and the number of the exhaust holes 121 is multiple.

[0055] This structure can further enable the hydrogen gas flow derived from the main combustion pipe 12 to be fully mixed with the combustion-supporting gas.

[0056] As an optional embodiment, the end of the stabilizing tube 11 is retracted into the cylinder 2 relative to the end of the main combustion tube 12 , so that the stabilizing tube 11 appears to be slightly shorter than the main combustion tube 12 .

[0057] This structure enables the end of the flame stabilizing tube 11 to fully contact the surrounding combustion-supporting gas and form a stable flame, ensuring stable combustion. At this time, the end of the flame stabilizing tube 11 can form a stable combustion zone, such as Figure 6 When the flame formed in the stable combustion zone contacts the hydrogen gas led out from the main combustion pipe 12, the corresponding hydrogen gas is ignited and a main combustion zone is formed in front of the main combustion pipe 12.

[0058] As an optional embodiment, there is a gap between the gas pipe 1 and the inner wall of the cylinder 2. This gap structure can be used to ensure that there is sufficient combustion-supporting gas at the main combustion pipe 12 so as not to affect the combustion of hydrogen at the main combustion pipe 12.

[0059] As an optional embodiment, the cylinder 2 is further provided with an ignition device 5 and / or a flame monitoring device 6. The ignition device 5 is used for ignition, and the flame monitoring device 6 is used to connect to a corresponding control device and monitor whether a flame exists.

[0060] exist Figure 1 In the embodiment, the ignition device 5 and the flame monitoring device 6 are both located on the hydrogen cylinder 22 .

[0061] The structures of the ignition device 5 and the flame monitoring device 6 are prior art, wherein the flame monitoring device 6 can be connected to a corresponding single chip microcomputer and perform data transmission when in use.

[0062] Example 2:

[0063] The difference between this embodiment 2 and embodiment 1 is that: Figure 5 As shown, in this embodiment, the number of the main combustion pipe 12 is one and the main combustion pipe 12 is an annular structure. The main combustion pipe 12 and the stabilizing combustion pipe 11 are coaxially arranged.

[0064] The main combustion tube 12 formed by this structural design is sleeved outside the stabilizing tube 11, thereby forming an annular hydrogen flow outside the stabilizing tube 11. The hydrogen and the combustion-supporting gas can be evenly mixed together and ignited by the flame at the stabilizing tube 11.

[0065] Correspondingly, the structures of the above-mentioned evenly distributing plate 3 and the combustion stabilizing plate 4 also need to be adaptively adjusted.

[0066] Example 3:

[0067] The present invention also provides a burner comprising any of the above-mentioned hydrogen ignition burners. Compared with conventional burners, the burner using the hydrogen ignition burner can achieve full combustion of pulverized coal, achieving the purpose of first-stage low-load stable combustion during ignition and startup of pulverized coal boilers.

[0068] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. Hydrogen ignition burner, characterized in that: include: A gas pipe, comprising a flame stabilizing pipe and a main flame pipe, wherein the number of the flame stabilizing pipe is one, and the main flame pipe is wound around the periphery of the flame stabilizing pipe with a gap left between the main flame pipe and the flame stabilizing pipe; A cylinder, wherein an equalizing disk and a flame stabilizing disk are sequentially arranged inside the cylinder along its axial direction, and a plurality of holes are provided in the thickness direction of the equalizing disk and the flame stabilizing disk, and the gas pipe is inserted into the cylinder through the holes, and there is a gap between the gas pipe and the equalizing disk and the flame stabilizing disk; The cylinder includes a combustion-supporting air cylinder and a hydrogen cylinder in sequence along its axial direction; The hydrogen cylinder is provided with a hydrogen inlet connected to the gas pipe, and hydrogen flows into the gas pipe through the hydrogen inlet; A combustion-supporting gas inlet is provided on one side of the combustion-supporting air cylinder close to the hydrogen cylinder, and the combustion-supporting gas flows into the combustion-supporting air cylinder through the combustion-supporting gas inlet and can flow through the equalizing plate and the combustion stabilizing plate in sequence to the other end of the combustion-supporting air cylinder; The end portion of the combustion stabilizing pipe is retracted into the cylinder relative to the end portion of the main combustion pipe.

2. The hydrogen ignition burner according to claim 1, characterized in that: There are multiple main combustion pipes, and all of the main combustion pipes are wound around the outer periphery of the combustion stabilizing pipe.

3. The hydrogen ignition burner according to claim 2, characterized in that: The number of the main combustion pipes is 4 to 12.

4. The hydrogen ignition burner according to claim 1, characterized in that: The number of the main combustion pipe is one and the main combustion pipe is annular in structure. The main combustion pipe and the combustion stabilizing pipe are coaxially arranged.

5. The hydrogen ignition burner according to any one of claims 2 to 4, characterized in that: The main combustion pipe is provided with an exhaust hole at one end portion and / or an outer edge close to the combustion stabilizing disk, and the number of the exhaust holes is multiple.

6. The hydrogen ignition burner according to claim 1, characterized in that: There is a gap between the gas pipe and the inner side wall of the cylinder.

7. The hydrogen ignition burner according to claim 1, characterized in that: The cylinder is also provided with an ignition device and / or a flame monitoring device.

8. Burner, characterized in that The invention comprises the hydrogen ignition burner according to any one of claims 1 to 7.

Images