A hydrogen heating device and a hydrogen reduction iron system

Abstract

The present application provides a hydrogen heating device and a hydrogen-reduced iron system, belonging to the technical field of hydrogen metallurgy. The hydrogen heating device includes a rotating detonation combustion chamber and a hydrogen heating pipeline. The rotating detonation combustion chamber includes an annular cavity, and an oxidant injection pipeline and a fuel injection pipeline are arranged on the annular cavity; the hydrogen heating pipeline penetrates through the annular cavity, and the central axis of the annular cavity coincides with the central axis of the hydrogen heating pipeline. The hydrogen-reduced iron system includes a hydrogen heating device and a hydrogen-reduced iron shaft furnace. The hydrogen heating device is located outside the hydrogen-reduced iron shaft furnace, and the hydrogen heating pipeline is connected to the hydrogen-reduced iron shaft furnace. Through the processing solution of the present application, the hydrogen heating efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of hydrogen metallurgy, and particularly to a hydrogen heating device and a hydrogen-reduced iron system. Background Art

[0002] Hydrogen metallurgy uses hydrogen instead of carbon as a reducing agent, and the reduction product is clean water. It is a new technology for reducing carbon dioxide emissions. Hydrogen-reduced iron uses hydrogen to replace traditional reducing gas as a reducing agent to reduce iron ore, producing direct reduced iron and water, achieving zero carbon emissions. However, the productivity of current hydrogen-reduced iron shaft furnaces is relatively low. One reason is the low hydrogen heating efficiency and long heating time. Summary of the Invention

[0003] In view of this, embodiments of this application provide a hydrogen heating device and a hydrogen-reduced iron system, which at least partially solve the problem of relatively low productivity of hydrogen-reduced iron shaft furnaces in the prior art.

[0004] In a first aspect, embodiments of this application provide a hydrogen heating device, which includes a rotating detonation combustor and a hydrogen heating pipeline.

[0005] The rotating detonation combustor includes an annular cavity, and an oxidant injection pipeline and a fuel injection pipeline are provided on the annular cavity.

[0006] The hydrogen heating pipeline penetrates through the annular cavity, and the central axis of the annular cavity coincides with the central axis of the hydrogen heating pipeline.

[0007] According to a specific implementation manner of embodiments of this application, the hydrogen heating pipeline includes a hydrogen inlet, a heating section, and a hydrogen outlet. The heating section penetrates through the annular cavity. The heating section includes a plurality of branch pipelines. One ends of the plurality of branch pipelines are all connected to the hydrogen inlet, and the other ends of the plurality of branch pipelines are all connected to the hydrogen outlet.

[0008] According to a specific implementation manner of embodiments of this application, the plurality of branch pipelines are uniformly arranged around the central axis of the hydrogen heating pipeline.

[0009] According to a specific implementation manner of embodiments of this application, the connection between the branch pipeline and the hydrogen inlet and the connection between the branch pipeline and the hydrogen outlet are streamline connections.

[0010] According to a specific implementation manner of embodiments of this application, the device further includes a fixing ring for fixing the hydrogen heating pipeline. The fixing ring is located between the hydrogen heating pipeline and the annular cavity, and the fixing ring is fixedly connected to the annular cavity.

[0011] According to a specific implementation manner of an embodiment of the present application, the annular cavity is provided with a first extended edge, the fixed ring is provided with a second extended edge, both the first extended edge and the second extended edge are located in the hydrogen outflow direction of the hydrogen heating pipeline, and the first extended edge is fixedly connected to the second extended edge.

[0012] According to a specific implementation manner of an embodiment of the present application, the inner wall of the hydrogen heating pipeline is provided with a heat-resistant material layer, and the heat-resistant temperature range of the heat-resistant material layer is 1300°C - 1400°C.

[0013] According to a specific implementation manner of an embodiment of the present application, the oxidant introduced into the oxidant injection pipeline and the fuel introduced into the fuel injection pipeline are triggered to explode by an igniter.

[0014] According to a specific implementation manner of an embodiment of the present application, the fuel introduced into the fuel injection pipeline is hydrogen fuel.

[0015] In a second aspect, an embodiment of the present application further provides a hydrogen-reduced iron system, which adopts the hydrogen heating device as described in any one of the embodiments in the first aspect above. The system further includes a hydrogen-reduced iron shaft furnace. The hydrogen heating device is located outside the hydrogen-reduced iron shaft furnace, and the hydrogen heating pipeline is connected to the hydrogen-reduced iron shaft furnace.

[0016] Beneficial effects

[0017] The hydrogen heating device in the embodiment of the present application has the advantage of a small volume. The hydrogen is heated by the huge heat generated by the rotating detonation technology. Since the heat is generated rapidly by the rotating detonation, the hydrogen heating time is short and the heating efficiency is high, which can effectively improve the productivity of the hydrogen-reduced iron shaft furnace. Description of the drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a three-dimensional view of a hydrogen heating device according to an embodiment of the present invention;

[0020] Figure 2 It is a side view of a hydrogen heating device according to an embodiment of the present invention.

[0021] In the figure: 1. Oxidant injection pipeline; 2. Fuel injection pipeline; 3. Annular cavity; 4. Hydrogen inlet; 5. Hydrogen outlet; 6. Heating section; 7. Fixed ring; 8. First extended edge. Detailed Implementation Modes

[0022] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0023] The following uses specific specific examples to illustrate the implementation modes of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts belong to the scope of protection of the present application.

[0024] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0025] It should also be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application schematically. Only the components related to the present application are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in its actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0026] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0027] In a first aspect, an embodiment of the present application provides a hydrogen heating device, which will be described in detail below with reference to Figure 1 and Figure 2 for a detailed description.

[0028] In one embodiment, with reference to Figure 1 and Figure 2, the hydrogen heating device includes a rotating detonation combustor and a hydrogen heating pipeline. The rotating detonation combustor includes an annular cavity 3, and an oxidant injection pipeline 1 and a fuel injection pipeline 2 are provided on the annular cavity 3; the hydrogen heating pipeline penetrates through the annular cavity 3, and the central axis of the annular cavity 3 coincides with the central axis of the hydrogen heating pipeline.

[0029] In this embodiment, the rotating detonation combustion technology is used to heat hydrogen. The rotating detonation combustion technology uses the detonation wave propagating in the annular cavity 3 (combustion chamber) to heat the hydrogen in the hydrogen heating pipeline. The fuel and oxidant are usually injected into the channel through small holes or slits, and the explosion in the fuel and oxidant mixture is triggered by a certain form of igniter. Since the rotating detonation technology generates huge energy and generates energy quickly, therefore, hydrogen can be quickly heated to the required temperature. The heated hydrogen is used in the hydrogen-reduced iron shaft furnace. Hydrogen-reduced iron uses hydrogen to replace the traditional reducing gas as a reducing agent to reduce iron ore. The required hydrogen temperature is about 1000 °C. Therefore, the use of the rotating detonation technology can shorten the hydrogen heating time, improve the hydrogen heating efficiency, and thus improve the efficiency of hydrogen-reduced iron.

[0030] In one embodiment, in order to heat hydrogen evenly, the hydrogen heating pipeline is improved. The hydrogen heating pipeline includes a hydrogen inlet 4, a heating section 6, and a hydrogen outlet 5. The heating section 6 penetrates through the annular cavity 3. The heating section 6 includes a plurality of branch pipelines. One ends of the plurality of branch pipelines are all connected to the hydrogen inlet 4, and the other ends of the plurality of branch pipelines are all connected to the hydrogen outlet 5. Therefore, the two ends of the hydrogen heating pipeline are the hydrogen inlet 4 and the hydrogen outlet 5, and the middle is connected with the heating section 6 of the plurality of branch pipelines. The plurality of branch pipelines are distributed in the annular cavity 3. Through this setting, the hydrogen entering from the hydrogen inlet 4 can be shunted, and the shunted hydrogen is in the plurality of branch pipelines. The heat generated by the rotating detonation in the annular cavity 3 is used to heat the hydrogen in the plurality of branch pipelines simultaneously. Therefore, by setting a plurality of branch pipelines, on the one hand, the hydrogen heating is made more uniform, and on the other hand, the hydrogen heating efficiency is improved.

[0031] Further, in order to improve the uniformity of hydrogen heating, the plurality of branch pipelines are uniformly arranged around the central axis of the hydrogen heating pipeline. Refer to Figure 2 , viewing the hydrogen heating device from the side of the hydrogen inlet 4, the plurality of branch pipelines are arranged in a petal shape. In this embodiment, the number of branch pipelines is not particularly limited, and can be reasonably set according to factors such as the hydrogen flow rate and the size of the annular cavity 3.

[0032] In one embodiment, the connection between the branch pipeline and the hydrogen inlet 4 and the connection between the branch pipeline and the hydrogen outlet 5 are streamline connections. Refer to Figure 1, after hydrogen enters from the hydrogen inlet 4, when entering the branch pipe, it enters the branch pipe along the streamlined pipe, making the flow of hydrogen in the pipe smoother and facilitating uniform heating.

[0033] In one embodiment, the hydrogen heating device further includes a fixing ring 7 for fixing the hydrogen heating pipe. The fixing ring 7 is located between the hydrogen heating pipe and the annular cavity 3, and the fixing ring 7 is fixedly connected to the annular cavity 3. Specifically, the fixing ring 7 wraps around the outside of the branch pipe, and the branch pipe is fixed through the fixing ring 7. The heat generated after rotational detonation occurs in the annular cavity 3 is transmitted to the branch pipe through the fixing ring 7 and heats the hydrogen in the branch pipe.

[0034] Furthermore, the annular cavity 3 is provided with a first extension edge 8 perpendicular to the central axis of the annular cavity 3. The fixing ring 7 is provided with a second extension edge extending outward, perpendicular to the central axis of the fixing ring 7. Both the first extension edge 8 and the second extension edge are located in the hydrogen outflow direction of the hydrogen heating pipe, and the first extension edge 8 is fixedly connected to the second extension edge. Specifically, the first extension edge 8 and the second extension edge can be connected by connectors such as bolts or screws to achieve the connection between the annular cavity 3 and the fixing ring 7. In this embodiment, the connectors for fixing the first extension edge 8 and the second extension edge are not limited, and commonly used connectors can be selected.

[0035] Since hydrogen needs to be heated to about 1000 °C, the inner wall of the hydrogen heating pipe is provided with a heat-resistant material layer, and the heat-resistant temperature range of the heat-resistant material layer is 1300 °C - 1400 °C. Therefore, in this embodiment, by utilizing the characteristics of the rotational detonation hollow annular combustion chamber, the hydrogen pipelines made of high-temperature-resistant materials are arranged around the inner ring, so that the heat generated by rotational detonation is used to heat hydrogen to about 1000 degrees Celsius as a reducing gas to reduce iron ore.

[0036] In one embodiment, the fuel injected into the fuel injection pipe 2 is hydrogen fuel. Using hydrogen fuel (hydrogen) as the heating fuel has high heating efficiency and no carbon dioxide emissions. It is a very clean energy source and is beneficial to reducing carbon dioxide emissions.

[0037] In a second aspect, the embodiment of the present application further provides a hydrogen-reduced iron system, which adopts the hydrogen heating device of any one of the above first aspects. The system further includes a hydrogen-reduced iron shaft furnace. The hydrogen heating device is located outside the hydrogen-reduced iron shaft furnace, and the hydrogen heating pipe is connected to the hydrogen-reduced iron shaft furnace.

[0038] In addition, since the hydrogen heating device uses rotational detonation combustion as the technology for heating hydrogen, other corresponding devices can be expanded later.

[0039] The embodiments provided by the present invention utilize the huge heat generated during the operation of the rotating detonation technology to heat hydrogen, which is then used for hydrogen reduction in a shaft furnace. Specifically, the rotating detonation technology generates huge energy through the detonation wave propagating in an annular cavity (circular). By utilizing the characteristics of the rotating detonation hollow annular combustion chamber, a hydrogen pipeline made of special high-temperature resistant material is arranged in the inner ring of the rotating detonation hollow annular combustion chamber, so as to use the heat generated by the rotating detonation to heat hydrogen to about 1000 degrees Celsius, which is used as a reducing gas to reduce iron ore. This device has the advantages of small volume and short hydrogen heating time, and is also conducive to reducing carbon dioxide emissions.

[0040] As mentioned above, the above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A hydrogen heating device, characterized in that, The device includes a rotating detonation combustor and a hydrogen heating pipeline. The rotating detonation combustor includes an annular cavity (3), and an oxidant injection pipeline (1) and a fuel injection pipeline (2) are arranged on the annular cavity (3). The hydrogen heating pipeline penetrates through the annular cavity (3), and the central axis of the annular cavity (3) coincides with the central axis of the hydrogen heating pipeline. The hydrogen heating pipeline includes a hydrogen inlet (4), a heating section (6) and a hydrogen outlet (5). The heating section (6) penetrates through the annular cavity (3). The heating section (6) includes a plurality of branch pipelines. One ends of the plurality of branch pipelines are all connected to the hydrogen inlet (4), and the other ends of the plurality of branch pipelines are all connected to the hydrogen outlet (5). The plurality of branch pipelines are uniformly arranged in a petal shape around the central axis of the hydrogen heating pipeline. The connection between the branch pipeline and the hydrogen inlet (4) and the connection between the branch pipeline and the hydrogen outlet (5) are in a streamlined connection.

2. The hydrogen heating device according to claim 1, characterized in that, The device further includes a fixing ring (7) for fixing the hydrogen heating pipeline. The fixing ring (7) is located between the hydrogen heating pipeline and the annular cavity (3), and the fixing ring (7) is fixedly connected to the annular cavity (3).

3. The hydrogen heating device according to claim 2, characterized in that, The annular cavity (3) is provided with a first outer extension edge (8), and the fixing ring (7) is provided with a second outer extension edge. Both the first outer extension edge (8) and the second outer extension edge are located in the hydrogen outflow direction of the hydrogen heating pipeline, and the first outer extension edge (8) is fixedly connected to the second outer extension edge.

4. The hydrogen heating device according to claim 1, characterized in that, The inner wall of the hydrogen heating pipeline is provided with a heat-resistant material layer, and the heat-resistant temperature range of the heat-resistant material layer is 1300°C - 1400°C.

5. The hydrogen heating device according to claim 1, characterized in that, The oxidant introduced into the oxidant injection pipeline (1) and the fuel introduced into the fuel injection pipeline (2) are triggered to explode by an igniter.

6. The hydrogen heating device according to claim 1, characterized in that, The fuel introduced into the fuel injection pipeline (2) is hydrogen fuel.

7. A hydrogen reduction iron system, adopting the hydrogen heating device according to any one of claims 1-6, characterized in that, The system further includes a hydrogen-reduced iron shaft furnace. The hydrogen heating device is located outside the hydrogen-reduced iron shaft furnace, and the hydrogen heating pipeline is connected to the hydrogen-reduced iron shaft furnace.

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