Hydrogen burner and boiler

Abstract

The invention relates to a hydrogen burner and a boiler, and the hydrogen burner comprises a hydrogen channel which is provided with a hydrogen inlet and a hydrogen outlet, and the hydrogen outlet is provided with a nozzle to increase the flame jetting distance; the air channel and the hydrogen channel are arranged in a separated mode, the air channel is provided with an air inlet and an air outlet, and the air outlet and the hydrogen outlet are located on the same side so that hydrogen and air can be mixed. The air channel and the hydrogen channel are arranged in a separated mode, the hydrogen outlet and the air outlet are located in the same side, hydrogen and air are mixed outside the hydrogen burner, the explosion risk of hydrogen and air mixing is reduced, the nozzle is arranged at the hydrogen outlet, the hydrogen spraying speed can be increased, the flame spraying distance is increased, and the flame spraying efficiency is improved. On one hand, explosion of the hydrogen burner caused by flame backflow can be prevented, and on the other hand, the space of flame radiation can be large.

Description

Technical Field

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

[0002] With the increasing installed capacity of renewable energy such as wind power and photovoltaics in my country, coal-fired units have gradually transformed from the main force of electricity production to flexible peak-shaving power sources, which has put forward higher requirements on the flexibility of coal-fired units; on the other hand, due to the limited capacity of the power grid to absorb renewable energy, producing hydrogen from renewable energy through water electrolysis technology and storing it in the form of hydrogen energy has become one of the ways to solve the problem of wind and power curtailment. Using hydrogen as an auxiliary fuel to achieve ultra-low load combustion of pulverized coal boilers and improve the flexibility of pulverized coal boilers has become a new path to improve the flexibility of coal-fired units.

[0003] In the related art, hydrogen and air are mixed and burned in a hydrogen burner, which has the risk of explosion, which may damage the hydrogen burner and affect the normal operation of the boiler. Summary of the invention

[0004] The purpose of the present disclosure is to provide a hydrogen burner and a boiler, which can solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a hydrogen burner, comprising: a hydrogen channel, having a hydrogen inlet and a hydrogen outlet, wherein a nozzle is provided at the hydrogen outlet to increase the flame spray distance; and an air channel, separated from the hydrogen channel, wherein the air channel has an air inlet and an air outlet, wherein the air outlet and the hydrogen outlet are located on the same side to allow the hydrogen to mix with the air.

[0006] Optionally, the hydrogen burner further comprises a shell, and one of the hydrogen channel and the air channel is disposed in the shell and spaced apart from an inner wall of the shell to form the other of the two.

[0007] Optionally, the air channel is arranged at the center of the shell, the cavity between the air channel and the shell is configured as the hydrogen channel, a plurality of nozzles are provided, and the plurality of nozzles are arranged at intervals and around the outside of the air channel.

[0008] Optionally, the nozzle is inclined outwardly so that an angle between a center line of the nozzle and a center line of the housing is 0°-45°.

[0009] Optionally, end surfaces of the hydrogen outlet and the air outlet are arranged flush with each other.

[0010] Optionally, the shell includes a first section close to the hydrogen inlet and a second section connected to the first section and close to the hydrogen outlet, the second section is trumpet-shaped and its diameter gradually increases from the hydrogen inlet to the hydrogen outlet; the air channel includes a third section close to the air inlet and a fourth section connected to the third section and close to the air outlet, the third section is trumpet-shaped and its diameter gradually increases from the air inlet to the air outlet.

[0011] Optionally, the hydrogen burner is used to be installed in a pulverized coal boiler.

[0012] The present disclosure further provides a boiler, comprising: a furnace body, in which a furnace is provided; and the above-mentioned hydrogen burner, wherein the hydrogen burner is arranged on a side wall of the furnace body and extends into the furnace.

[0013] Optionally, the boiler further comprises a pulverized coal burner, wherein the pulverized coal burner is arranged on a side wall of the furnace body and extends into the furnace, and the hydrogen burner is arranged above the pulverized coal burner.

[0014] Optionally, one end of the hydrogen burner extending into the furnace is inclined toward the pulverized coal burner so that the angle between the hydrogen burner and the side wall of the furnace body is 60°-90°.

[0015] Through the above technical scheme, in the hydrogen burner provided by the present invention, the air channel and the hydrogen channel are separated and the hydrogen outlet and the air outlet are located on the same side, so that the hydrogen and the air are mixed outside the hydrogen burner, reducing the explosion risk of the mixture of hydrogen and air. A nozzle is provided at the hydrogen outlet to increase the speed of hydrogen spraying and the distance of flame spraying, which can prevent the explosion of the hydrogen burner caused by flame backflow on the one hand, and can also provide a larger space for flame radiation on the other hand.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 is a schematic structural diagram of a hydrogen burner in the present disclosure;

[0019] Figure 2 is a perspective view of a hydrogen burner in the present disclosure;

[0020] Figure 3 is a cross-sectional view of a hydrogen burner in the present disclosure;

[0021] Figure 4 is a side view of a hydrogen burner in the present disclosure;

[0022] Figure 5 It is a schematic diagram of the installation of the hydrogen burner in the present disclosure.

[0023] Description of Reference Numerals

[0024] 1. Shell; 11. First section; 12. Second section; 2. Nozzle; 3. Air channel; 31. Air inlet; 32. Air outlet; 33. Third section; 34. Fourth section; 4. Hydrogen channel; 41. Hydrogen inlet; 42. Hydrogen outlet; 5. Furnace body; 51. Furnace chamber; 6. Hydrogen burner; 7. Pulverized coal burner. DETAILED DESCRIPTION

[0025] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0026] In the present disclosure, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower positions of the corresponding parts in the direction of gravity when in use, and "inner" and "outer" refer to the inner and outer positions relative to the contour of the parts or structures themselves. In addition, it should be noted that the terms used, such as "first, second, third, fourth", etc., are used to distinguish one element from another and do not have order and importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.

[0027] The present disclosure provides a hydrogen burner, comprising: a hydrogen channel 4, having a hydrogen inlet 41 and a hydrogen outlet 42, wherein a nozzle 2 is provided at the hydrogen outlet 42 to increase the flame spray distance; and an air channel 3, which is separated from the hydrogen channel 4, and the air channel 3 has an air inlet 31 and an air outlet 32, wherein the air outlet 32 ​​and the hydrogen outlet 42 are located on the same side to allow hydrogen to mix with air.

[0028] Through the above technical solution, in the hydrogen burner 6 provided by the present disclosure, the air channel 3 is separated from the hydrogen channel 4 and the hydrogen outlet 42 is located on the same side as the air outlet 32, so that the hydrogen and air are mixed outside the hydrogen burner 6, reducing the risk of explosion when the hydrogen and air are mixed inside the hydrogen burner 6. The nozzle 2 is provided at the hydrogen outlet 42 to increase the speed of hydrogen ejection and the distance of flame injection. On the one hand, it can prevent the flame from flowing back and causing the hydrogen burner 6 to explode, and on the other hand, it can make the space for flame radiation larger. Of course, an ignition device needs to be provided on the hydrogen burner 6, and the ignition device in the relevant technology can be used, and the present disclosure does not limit it.

[0029] As an optional implementation, Figure 1-4 As shown, the hydrogen burner 6 also includes a shell 1, and one of the hydrogen channel 4 and the air channel 3 is arranged in the shell 1 and is spaced from the inner wall of the shell 1 to form the other of the two, that is, the hydrogen channel 4 and the air channel 3 are both arranged in the shell 1, and the shell 1 can protect the hydrogen channel 4 and the air channel 3. Only one channel needs to be set separately, and the outer wall of the channel and the inner wall of the shell 1 can form another channel, and no separate setting is required. In other embodiments, the hydrogen channel 4 and the air channel 3 can also be set separately, and the hydrogen channel 4 and the air channel 3 are arranged side by side. In this case, the shell 1 can be arranged around the outside, or the shell 1 can be not arranged.

[0030] Optionally, the air channel 3 is arranged at the center of the shell 1, and the cavity between the air channel 3 and the shell 1 is configured as a hydrogen channel 4, and the hydrogen channel 4 is arranged on the outside of the air channel 3, so that the radiation range of the flame can be increased. A plurality of nozzles 2 are provided, and the plurality of nozzles 2 are arranged at intervals and around the outside of the air channel 3. The nozzles 2 are arranged in an annular shape to form an annular flame, and a small amount of hydrogen can affect a very large range. The air enters the furnace 51 of the boiler from the air channel 3, and a part of the air is directly mixed with the hydrogen ejected from the hydrogen channel 4 to assist the combustion of the hydrogen, and the other part enters the furnace 51 and contacts the side wall of the furnace 51 so as to be dispersed in the furnace 51 and mixed with the hydrogen. In other embodiments, the hydrogen channel 4 can also be arranged at the center of the shell 1, and the air channel 3 is formed between the outer wall of the hydrogen channel 4 and the inner wall of the shell 1, and the nozzle 2 is arranged at the hydrogen outlet 42.

[0031] Among them, the nozzle 2 is inclined outward so that the angle between the center line of the nozzle 2 and the center line of the shell 1 is 0°-45°, for example, it can be 0°, 30°, 45°, etc. According to the range of radiation required by the hydrogen burner 6, a hydrogen burner 6 with different angles of the nozzle 2 can be selected. After the design and calculation, the angle cannot be adjusted and changed at any time. The larger the angle, the wider the radiation range, but the closer the hydrogen injection distance; the smaller the angle, the narrower the radiation range, but the longer the hydrogen injection distance.

[0032] As an optional implementation, Figure 3 As shown, the end faces of the hydrogen outlet 42 and the air outlet 32 ​​are arranged flush with each other to ensure that the hydrogen and air are contacted and mixed to complete combustion at the first time. If there is a certain distance between the hydrogen outlet 42 and the air outlet 32, there will be a certain delay in the mixing of air and hydrogen, and they cannot be mixed at the first time.

[0033] As an optional implementation, Figure 1-3As shown, the shell 1 includes a first section 11 close to the hydrogen inlet 41 and a second section 12 connected to the first section 11 and close to the hydrogen outlet 42, the second section 12 is trumpet-shaped and its diameter gradually increases from the hydrogen inlet 41 to the hydrogen outlet 42 to increase the radiation range of the flame; the air channel 3 includes a third section 33 close to the air inlet 31 and a fourth section 34 connected to the third section 33 and close to the air outlet 32, the third section 33 is trumpet-shaped and its diameter gradually increases from the air inlet 31 to the air outlet 32 ​​to increase the radiation range of the air.

[0034] As an optional implementation, the hydrogen burner 6 is used to be installed in the pulverized coal boiler, and hydrogen is used as an auxiliary fuel to achieve ultra-low load combustion of the pulverized coal boiler and improve the flexibility of the pulverized coal boiler.

[0035] like Figure 5 As shown, the present disclosure also provides a boiler, including: a furnace body 5, in which a furnace 51 is provided; and the above-mentioned hydrogen burner 6, the hydrogen burner 6 is arranged on the side wall of the furnace body 5 and extends into the furnace 51, so that the flame is sprayed into the furnace 51, the air channel 3 and the hydrogen channel 4 of the hydrogen burner 6 are separated and the hydrogen outlet 42 and the air outlet 32 ​​are located on the same side, so that the hydrogen and the air are mixed outside the hydrogen burner 6, reducing the explosion risk of the mixture of hydrogen and air, and the nozzle 2 is provided at the hydrogen outlet 42 to increase the speed of hydrogen spraying and increase the distance of flame spraying. On the one hand, it can prevent the explosion of the hydrogen burner 6 caused by flame reflux, and on the other hand, it can make the space for flame radiation larger.

[0036] Optionally, the boiler also includes a pulverized coal burner 7, which is arranged on the side wall of the furnace body 5 and extends into the furnace 51. The hydrogen burner 6 is arranged above the pulverized coal burner 7. When the boiler is burning at an ultra-low load, the temperature required by the boiler is relatively low, and the pulverized coal burner 7 does not burn. The primary air carrying pulverized coal sprayed by the pulverized coal burner 7 enters the hydrogen flame zone, thereby achieving the stability of pulverized coal combustion at an ultra-low load.

[0037] Among them, one end of the hydrogen burner 6 extending into the furnace 51 is inclined toward the pulverized coal burner 7 so that the angle between the hydrogen burner 6 and the side wall of the furnace body 5 is 60°-90°, for example, it can be 60°, 70°, 90°, etc., and the flame is sprayed toward the pulverized coal burner 7 so that the flame can ignite the pulverized coal feed.

[0038] In actual use, the hydrogen burner 6 is arranged above the pulverized coal burner 7. Air is first introduced into the air channel 3, and then hydrogen is introduced into the hydrogen channel 4. The hydrogen is ignited using an ignition device, and primary air carrying pulverized coal is introduced into the pulverized coal burner 7 to allow the pulverized coal to enter the flame zone of the hydrogen for ignition, thereby achieving ultra-low load combustion of the boiler. The spray distance of the flame is increased by arranging the nozzle 2, and the radiation range of the flame is increased by arranging the nozzle 2 in a ring shape and the trumpet-shaped second section 12 and fourth section 34, so that the flame can completely cover the pulverized coal feed to ensure sufficient combustion of the pulverized coal feed.

[0039] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0041] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A hydrogen burner, characterized in that: include: A hydrogen channel having a hydrogen inlet and a hydrogen outlet, wherein a nozzle is provided at the hydrogen outlet to increase the flame spray distance; as well as The air channel is separated from the hydrogen channel, and has an air inlet and an air outlet. The air outlet and the hydrogen outlet are located on the same side to mix the hydrogen with the air.

2. The hydrogen burner according to claim 1, characterized in that: The hydrogen burner further includes a shell, and one of the hydrogen passage and the air passage is disposed in the shell and spaced apart from an inner wall of the shell to form the other of the two.

3. The hydrogen burner according to claim 2, characterized in that: The air channel is arranged at the center of the shell, the cavity between the air channel and the shell is configured as the hydrogen channel, a plurality of nozzles are provided, and the plurality of nozzles are arranged at intervals and surround the outside of the air channel.

4. The hydrogen burner according to claim 3, characterized in that: The nozzle is inclined outwardly so that an angle between a center line of the nozzle and a center line of the housing is 0°-45°.

5. The hydrogen burner according to claim 1, characterized in that: The end surfaces of the hydrogen outlet and the air outlet are arranged flush with each other.

6. The hydrogen burner according to claim 3, characterized in that: The shell includes a first section close to the hydrogen inlet and a second section connected to the first section and close to the hydrogen outlet, the second section is trumpet-shaped and its diameter gradually increases from the hydrogen inlet to the hydrogen outlet; the air channel includes a third section close to the air inlet and a fourth section connected to the third section and close to the air outlet, the third section is trumpet-shaped and its diameter gradually increases from the air inlet to the air outlet.

7. The hydrogen burner according to claim 1, characterized in that: The hydrogen burner is used for being installed in a pulverized coal boiler.

8. A boiler, characterized in that: include: A furnace body, in which a furnace chamber is arranged; as well as The hydrogen burner according to any one of claims 1 to 7, wherein the hydrogen burner is arranged on the side wall of the furnace body and extends into the furnace.

9. The boiler according to claim 8, characterized in that The boiler further comprises a pulverized coal burner, which is arranged on the side wall of the furnace body and extends into the furnace, and the hydrogen burner is arranged above the pulverized coal burner.

10. The boiler according to claim 9, characterized in that One end of the hydrogen burner extending into the furnace is inclined toward the pulverized coal burner so that the angle between the hydrogen burner and the side wall of the furnace body is 60°-90°.

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