Hydrogen combustion nozzle capable of reducing nozzle caking and hydrogen combustion boiler

Abstract

The utility model provides a hydrogen combustion nozzle capable of reducing nozzle caking and a hydrogen combustion boiler, the hydrogen combustion nozzle comprises an inner pipe and an outer pipe, the outer pipe is concentrically arranged outside the inner pipe, and the inner pipe comprises a first gas inlet part located at one end of the inner pipe and a second gas inlet part located at the other end of the inner pipe; the first throttling element is arranged on the inner pipe; the first air outlet part is positioned at the other end of the inner pipe; in the inner pipe, the inner diameter from the first air inlet part to the center of the first throttling element is decreased, and the inner diameter from the center of the first throttling element to the first air outlet part is increased; two ends of the outer pipe are respectively a second air inlet part and a second air outlet part, the second air inlet part is located on the same side of the first air inlet part, and the second air outlet part and the first air outlet part are located on the same side; and the end part of the first air outlet part is deeper than that of the second air outlet part. The hydrogen flow rate is increased through the first throttling element, and therefore the problem that salt generated after alkali mist contained in hydrogen is burnt blocks the nozzle can be effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen combustion nozzles and combustion boilers, and more specifically, to a hydrogen combustion nozzle and a hydrogen combustion boiler capable of reducing nozzle agglomeration. Background Art

[0002] Since hydrogen concentrations between 4.1% and 74.8% can cause explosions when exposed to open flames, chemical plants generally burn excess hydrogen. Chemical plants can also burn hydrogen to generate a large amount of heat energy for various process steps. Utility Model Content

[0003] In the above background, the applicant found that since hydrogen contains water and alkaline mist, the alkaline mist burns to generate salt in the hydrogen combustion boiler. During the long-term use of the hydrogen combustion nozzle, as the salt accumulates at the hydrogen nozzle, the salt will block the nozzle and cause the hydrogen boiler to stop operating.

[0004] The purpose of the present application is to solve the problem that the hydrogen boiler stops running because the hydrogen contains alkaline mist, causing the hydrogen nozzle in the hydrogen boiler to be easily blocked by salt generated after the alkaline mist burns.

[0005] In order to achieve the above-mentioned purpose, the present application provides a hydrogen combustion nozzle that reduces nozzle agglomeration, comprising: an inner tube and an outer tube, the outer tube is concentrically arranged outside the inner tube, and the inner tube comprises: a first air inlet located at one end of the inner tube; a first throttling member arranged in the inner tube; a first air outlet located at the other end of the inner tube; in the inner tube, the inner diameter from the first air inlet to the center of the first throttling member becomes smaller, and the inner diameter from the center of the first throttling member to the first air outlet becomes larger; the two ends of the outer tube are respectively a second air inlet and a second air outlet, the second air inlet is located on the same side of the first air inlet, and the second air outlet is on the same side as the first air outlet; the end of the first air outlet is deeper than the end of the second air outlet.

[0006] The inner diameter of the inner tube from the first air inlet to the center of the first throttle becomes smaller, and the inner diameter from the center of the first throttle to the first air outlet becomes larger. When hydrogen flows through the first throttle, the first throttle shrinks the hydrogen beam and causes local eddy loss of hydrogen, so that the hydrogen generates a pressure difference on both sides of the first throttle. Since the increase in fluid velocity in the narrow channel of the first throttle leads to an increase in kinetic energy, the increase in kinetic energy means a decrease in pressure. Low pressure is generated near the high-speed flowing hydrogen, thereby generating an adsorption effect, which helps to accelerate the airflow, so that the airflow has a higher flow rate when entering the first throttle, making it more difficult for salt particles to deposit in the high-speed airflow. The outer tube is used to let in air, and the two ends of the outer tube are respectively the second air inlet and the second air outlet. The end of the first air outlet is deeper than the end of the second air outlet, so that the hydrogen combustion process occurs outside the nozzle, and under the action of the first throttle, a huge flow rate is generated at the nozzle, and the salt formed by the combustion can be blown out of the nozzle. Thereby, the problem of salt blocking the nozzle after the combustion of the alkaline mist contained in the hydrogen can be effectively solved.

[0007] According to the above hydrogen combustion nozzle provided by the present application, the first throttle member is arranged around the inner wall of the inner tube, and the cross section of the first throttle member is ∨-shaped.

[0008] According to the above hydrogen combustion nozzle provided by the present application, the first throttle member has a first throttle surface and a second throttle surface, the first throttle surface is located on one side of the first air inlet portion, and the second throttle surface is located on one side of the first air outlet portion.

[0009] According to the hydrogen combustion nozzle provided in the present application, a first angle between the first throttle surface and the axial direction of the inner tube is smaller than a second angle between the second throttle surface and the axial direction of the inner tube.

[0010] According to the above-mentioned hydrogen combustion nozzle provided in the present application, a second throttling member is arranged in the tube cavity of the outer tube.

[0011] According to the above hydrogen combustion nozzle provided by the present application, the second throttling member is connected to the outer wall of the inner tube in a surrounding manner, and the cross section of the second throttling member is ∧-shaped.

[0012] According to the above hydrogen combustion nozzle provided in the present application, the second throttle member has a third throttle surface and a fourth throttle surface, the third throttle surface is located on one side of the second air inlet portion, and the fourth throttle surface is located on one side of the second air outlet portion.

[0013] According to the hydrogen combustion nozzle provided in the present application, a third angle between the third throttle surface and the axial direction of the outer tube is smaller than a fourth angle between the fourth throttle surface and the axial direction of the outer tube.

[0014] According to the above-mentioned hydrogen combustion nozzle provided by the present application, the second air inlet portion is connected to the outer tube connecting portion through a bent pipe.

[0015] The present application also provides a hydrogen combustion boiler, which uses the above-mentioned hydrogen combustion nozzle provided by the present application.

[0016] The beneficial effects of this application are:

[0017] 1. The inner diameter of the inner tube from the first air inlet to the center of the first throttle becomes smaller, and the inner diameter from the center of the first throttle to the first air outlet becomes larger. When hydrogen flows through the first throttle, the first throttle shrinks the hydrogen beam and causes local eddy loss of hydrogen, so that hydrogen produces a pressure difference on both sides of the first throttle. Since the increase in fluid velocity in the narrow channel of the first throttle leads to an increase in kinetic energy, the increase in kinetic energy means a decrease in pressure. Low pressure will be generated near the high-speed flowing hydrogen, thereby generating an adsorption effect, which helps to accelerate the airflow, so that the airflow has a higher flow rate when entering the first throttle, making it more difficult for salt particles to deposit in the high-speed airflow. The outer tube is used to let in air, and the two ends of the outer tube are the second air inlet and the second air outlet respectively. The end of the first air outlet is deeper than the end of the second air outlet, so that the hydrogen combustion process occurs outside the nozzle, and under the action of the first throttle, a huge flow rate is generated at the nozzle, and the salt formed by combustion can be blown out of the nozzle. Thereby, the problem of salt blocking the nozzle after the combustion of alkali mist contained in hydrogen can be effectively solved.

[0018] 2. Since the oxygen-containing gas introduced into the outer tube can help the hydrogen to burn, a second throttling piece is arranged in the tube cavity of the outer tube to accelerate the flow rate of the air at the nozzle. The high-speed air flow can form a negative pressure at the nozzle outlet, so that the hydrogen combustion point is further away from the nozzle, which can prevent salt from accumulating at the nozzle, and the high-speed air flow can also blow away the salt that may be deposited.

[0019] In addition to the technical problems solved by the present application, the technical features that constitute the technical solutions, and the advantages brought by the technical features of these technical solutions described above, other technical problems that can be solved by the present application, other technical features included in the technical solutions, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a hydrogen boiler in an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of a hydrogen combustion nozzle for reducing nozzle agglomeration in an embodiment of the present application;

[0022] Description of reference numerals:

[0023] 1. inner tube; 11. first air inlet; 12. first throttle element; 121. first throttle surface; 122. second throttle surface; 13. first air outlet; α. first angle; β. second angle;

[0024] 2. outer tube; 21. second air inlet; 22. second throttle element; 221. third throttle surface; 222. fourth throttle surface; γ, third angle; δ, fourth angle; 24. elbow; 25. outer tube connection; 23. second air outlet. DETAILED DESCRIPTION

[0025] The embodiments of the technical solution of the present application will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 The diagram shows a hydrogen combustion boiler 1000, in which a plurality of hydrogen combustion nozzles are arranged. However, since hydrogen contains water and alkaline mist in the water, salt is generated after the alkaline mist burns in the hydrogen combustion boiler. During the long-term use of the hydrogen combustion nozzle, as the salt accumulates at the hydrogen nozzle, the salt generated after the alkaline mist remaining in the water in the hydrogen burns will clog the nozzle, causing the hydrogen boiler to stop operating.

[0027] In order to solve the problem that the hydrogen nozzle in the hydrogen boiler is easily blocked by salt due to the alkaline mist contained in the hydrogen, which produces salt after combustion, causing the hydrogen boiler to stop running.

[0028] like Figure 2 An embodiment of a hydrogen combustion nozzle for reducing nozzle agglomeration provided by the present application is illustrated, in which the hydrogen combustion nozzle 100 comprises: an inner tube 1 and an outer tube 2, hydrogen is introduced into the inner tube 1, and oxygen-containing gas, such as air, is introduced into the outer tube 2, the outer tube 2 is concentrically arranged outside the inner tube 1, and the inner tube 1 comprises: a first air inlet 11 located at one end of the inner tube 1; a first throttle 12 arranged in the inner tube 1; a first air outlet 13 located at the other end of the inner tube 1; in the inner tube 1, the inner diameter from the first air inlet 11 to the center of the first throttle 12 becomes smaller, and the inner diameter from the center of the first throttle 12 to the first air outlet 13 becomes larger; the two ends of the outer tube 2 are respectively a second air inlet 21 and a second air outlet 23, the second air inlet 21 is located on the same side of the first air inlet 11, the second air outlet 23 is on the same side as the first air outlet 13, and the end of the first air outlet 13 is deeper than the end of the second air outlet 23.

[0029] The hydrogen combustion nozzle provided in this embodiment can effectively solve the problem of salt produced after the combustion of alkaline mist in hydrogen blocking the nozzle through the structural design of the inner and outer tubes. The design of the first throttle 12 in the inner tube 1 plays a key role. The inner diameter from the first air inlet 11 to the center of the first throttle 12 becomes smaller, and the inner diameter from the center of the first throttle 12 to the first air outlet 13 becomes larger. When hydrogen flows through the first throttle 12, the first throttle 12 shrinks the hydrogen beam and causes local eddy current loss in the hydrogen, thereby generating a pressure difference between the hydrogen and the two sides of the first throttle 12. This is because in the narrow channel of the first throttle 12, the increase in fluid velocity leads to an increase in kinetic energy, and the increase in kinetic energy means a decrease in pressure. Low pressure will be generated near the high-speed flowing hydrogen, thereby generating an adsorption effect, which helps to accelerate the airflow, so that the airflow has a higher flow rate when entering the first throttle 12, making it more difficult for salt particles to deposit in the high-speed airflow. The outer tube is used to let in air, and the two ends of the outer tube are respectively a second air inlet and a second air outlet. The end of the first air outlet 13 is deeper than the end of the second air outlet 23, so that the hydrogen combustion process occurs outside the nozzle, and under the action of the first throttling member 12, a huge flow rate is generated at the nozzle, which can blow the salt formed by the combustion out of the nozzle.

[0030] In a preferred embodiment, the first throttle 12 is arranged around the inner wall of the inner tube 1, and the cross section of the first throttle 12 is ∨-shaped. The first throttle 12 arranged around the inner wall can ensure that the airflow is uniformly affected on the entire inner tube cross section. Due to the ∨-shaped cross section of the throttle, when the airflow passes through the throttle, the flow rate will increase accordingly due to the gradual decrease in the cross-sectional area. This accelerated airflow can effectively wash away the salt particles that may be attached to the tube wall during the combustion of hydrogen, thereby reducing the accumulation of salt in the nozzle. Specifically, the first throttle 12 has a first throttle surface 121 and a second throttle surface 122, the first throttle surface 121 is located on one side of the first air inlet 11, and the second throttle surface 122 is located on one side of the first air outlet 13. Optionally, the angle of the first throttle surface 121 and the axial first angle α of the inner tube 1 is smaller than the angle of the second throttle surface 122 and the axial second angle β of the inner tube 1.

[0031] On the basis of the above embodiment, in another optional embodiment, a second throttle 22 is arranged in the tube cavity of the outer tube 2. The second throttle 22 is connected around the outer wall of the inner tube 1, and the cross section of the second throttle 22 is ∧-shaped. The second throttle 22 has a third throttle surface 221 and a fourth throttle surface 222, the third throttle surface 221 is located on one side of the second air inlet 21, and the fourth throttle surface 222 is located on one side of the second air outlet 23. The angle of the third angle γ between the third throttle surface 221 and the axial direction of the outer tube 2 is smaller than the angle of the fourth angle δ between the fourth throttle surface 222 and the axial direction of the outer tube 2.

[0032] Since the oxygen-containing gas is introduced into the outer tube 2, it can play a role in supporting the combustion of hydrogen. A second throttling member 22 is arranged in the tube cavity of the outer tube 2 to accelerate the flow rate of air at the nozzle. The high-speed flowing air can form a negative pressure at the nozzle outlet end, so that the hydrogen combustion point is further away from the nozzle, which can prevent salt from accumulating at the nozzle. In addition, the high-speed flowing air can also blow away the salt that may be deposited.

[0033] like Figure 2 The second air inlet 21 is connected to the outer tube connection part 25 through the elbow 24.

[0034] The present invention also provides an embodiment of a hydrogen combustion boiler 1000, such as Figure 1 , using the hydrogen combustion nozzle 100 provided by the above embodiment of the present invention.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "upper", "lower", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "set", "provided with", "connected", "installed" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be directly connected, or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydrogen combustion nozzle for reducing nozzle agglomeration, comprising: An inner tube (1) and an outer tube (2), wherein the outer tube (2) is concentrically arranged outside the inner tube (1), and is characterized in that the inner tube (1) comprises: A first air inlet portion (11) located at one end of the inner tube (1); A first throttle member (12) disposed on the inner tube (1); a first air outlet (13) located at the other end of the inner tube (1); In the inner tube (1), the inner diameter from the first air inlet (11) to the center of the first throttling member (12) becomes smaller, and the inner diameter from the center of the first throttling member (12) to the first air outlet (13) becomes larger; The two ends of the outer tube (2) are respectively a second air inlet (21) and a second air outlet (23); The second air inlet (21) is located on the same side as the first air inlet (11), and the second air outlet (23) is located on the same side as the first air outlet (13); An end portion of the first air outlet portion (13) is deeper than an end portion of the second air outlet portion (23).

2. The hydrogen combustion nozzle according to claim 1, characterized in that: The first throttling member (12) is arranged around the inner wall of the inner tube (1), and the cross section of the first throttling member (12) is ∨-shaped.

3. The hydrogen combustion nozzle according to claim 2, characterized in that: The first throttle member (12) has a first throttle surface (121) and a second throttle surface (122), wherein the first throttle surface (121) is located on one side of the first air inlet portion (11), and the second throttle surface (122) is located on one side of the first air outlet portion (13).

4. The hydrogen combustion nozzle according to claim 3, characterized in that: A first axial angle (α) between the first throttling surface (121) and the inner tube (1) is smaller than a second axial angle (β) between the second throttling surface (122) and the inner tube (1).

5. The hydrogen combustion nozzle according to claim 1, characterized in that: A second throttling member (22) is arranged in the tube cavity of the outer tube (2).

6. The hydrogen combustion nozzle according to claim 5, characterized in that: The second throttling member (22) is connected to the outer wall of the inner tube (1) in a surrounding manner, and the cross section of the second throttling member (22) is ∧-shaped.

7. The hydrogen combustion nozzle according to claim 6, characterized in that: The second throttle member (22) has a third throttle surface (221) and a fourth throttle surface (222), wherein the third throttle surface (221) is located on one side of the second air inlet portion (21), and the fourth throttle surface (222) is located on one side of the second air outlet portion (23).

8. The hydrogen combustion nozzle according to claim 7, characterized in that: The third axial angle (γ) between the third throttling surface (221) and the outer tube (2) is smaller than the fourth axial angle (δ) between the fourth throttling surface (222) and the outer tube (2).

9. The hydrogen combustion nozzle according to claim 1, characterized in that: The second air inlet portion (21) is connected to the outer tube connecting portion (25) via a bent pipe (24).

10. A hydrogen combustion boiler, characterized in that: Use the hydrogen combustion nozzle described in any one of claims 1 to 8.

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