An integrated desulfurization and denitrification reactor for coke oven flue gas

Abstract

This utility model discloses an integrated desulfurization and denitrification reactor for coke oven flue gas, belonging to the field of coke oven flue gas treatment. The utility model includes a reactor body, with a gas flow equalization mechanism installed on the inner top wall of the reactor body. This gas flow equalization mechanism includes: a fixed ring, which is installed around the inner top wall of the reactor body; multiple sieve plates, which are spaced apart along the height direction on the lower part of the inner wall of the fixed ring; and a conical guide plate, which is supported and installed on the top of the fixed ring, forming an annular gap channel for flue gas discharge between the conical guide plate and the fixed ring. When the treated gas enters the gas flow equalization mechanism, it first experiences different obstruction and guidance effects from the multiple sieve plates; then, guided by the guide plate, the gas flow direction changes, and it begins to move irregularly, thus forming a complex and variable flow path. The gas velocity and direction are fully adjusted, effectively improving the gas treatment effect.

Description

Technical Field

[0001] This utility model belongs to the field of coke oven flue gas treatment technology, specifically relating to an integrated desulfurization and denitrification reactor for coke oven flue gas. Background Technology

[0002] Coke ovens generate large amounts of flue gas during the coking process, containing harmful pollutants such as sulfur dioxide and nitrogen oxides. These pollutants, when released into the atmosphere, contribute to environmental problems such as acid rain and photochemical smog, posing serious threats to the ecological environment and human health. Therefore, desulfurization and denitrification treatment of coke oven flue gas is a necessary measure to reduce air pollution and achieve sustainable development.

[0003] Currently, in the field of desulfurization and denitrification treatment of coke oven flue gas, most commonly used desulfurization and denitrification towers are equipped with gas flow equalization devices. The original intention was to improve the gas distribution inside the tower and enhance the treatment effect. However, in actual application, the performance of existing gas flow equalization devices is not satisfactory. Due to the lack of scientific and reasonable design structure, the effect of improving the problem of uneven gas flow velocity is relatively poor. When the gas flows inside the tower, there are still local phenomena of excessively fast or slow flow velocities. This not only affects the treatment efficiency of coke oven flue gas, but also increases system resistance, leading to an increase in fan energy consumption. Utility Model Content

[0004] To address the problem of uneven gas velocity distribution in existing desulfurization and denitrification reactors, which affects flue gas treatment efficiency and increases fan energy consumption, this invention provides an integrated desulfurization and denitrification reactor for coke oven flue gas. By optimizing the structure of the gas flow equalization device inside the reactor, the uniformity of gas distribution can be effectively improved, thus enhancing the treatment effect and efficiency of the flue gas.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This utility model provides an integrated desulfurization and denitrification reactor for coke oven flue gas, including a reactor body. An inlet pipe is connected to one side of the bottom of the reactor body, and an outlet is provided at the top. A gas flow equalization mechanism is installed on the inner wall of the top of the reactor body, and the gas flow equalization mechanism includes:

[0007] A fixing ring is installed around the top inner wall of the reactor body;

[0008] Screen plates, multi-stage screen plates are installed at intervals along the height direction on the lower part of the inner wall of the fixing ring;

[0009] And a conical guide plate, which is supported and installed on the top of the fixed ring, and an annular gap channel for flue gas to be discharged is formed between the conical guide plate and the fixed ring. After the flue gas is treated by the gas equalization mechanism, it is discharged through the channel to the gas outlet at the top of the reactor body.

[0010] Furthermore, the fixing ring includes a cylindrical section and a conical section, with multi-stage sieve plates spaced along the height direction on the inner wall of the cylindrical section, and the conical section located above the cylindrical section, with its upper aperture being larger than its lower aperture.

[0011] Furthermore, the upper outer side of the conical section is provided with several support frames distributed at intervals along its circumference, and the conical guide plate is supported and installed on the top of the conical section through the support frames.

[0012] Furthermore, the bottom of the fixing ring is provided with a guide section, which is a tapered structure with an upper aperture smaller than a lower aperture.

[0013] Furthermore, the multi-stage sieve plate is provided with multiple sets of air holes that are evenly spaced, and the pore size on the sieve plate gradually decreases from bottom to top, while the pore density gradually increases from bottom to top.

[0014] Furthermore, the pores on adjacent sieve plates are staggered.

[0015] Furthermore, the sieve plate includes a first sieve plate, a second sieve plate, and a third sieve plate arranged sequentially from bottom to top.

[0016] Furthermore, the bottom of the reactor body is the desulfurization reaction zone, and above the desulfurization reaction zone and below the gas flow equalization mechanism is the denitrification reaction zone. The reactor body corresponding to the denitrification reaction zone is provided with several ammonia injection pipes evenly spaced.

[0017] Furthermore, several sets of circular openings are provided on the surface of the reactor body corresponding to the denitrification reaction zone. The ammonia injection pipe is fixedly installed in the above-mentioned circular openings, with one end extending into the interior of the reactor body and the other end connected to the ammonia storage tank.

[0018] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0019] (1) This utility model sets a gas flow equalization mechanism at the top of the integrated desulfurization and denitrification reactor for coke oven flue gas and optimizes the structure of the gas flow equalization mechanism, thereby effectively improving the uniformity of flue gas outlet distribution after desulfurization and denitrification, avoiding excessively high or low local flow velocities, thus improving the treatment efficiency and effect of coke oven flue gas, and reducing system resistance and fan energy consumption.

[0020] (2) The gas flow equalization mechanism of this utility model has a built-in layered sieve plate structure and a guide plate structure. When the treated gas enters the gas flow equalization mechanism, it first passes through multiple sieve plates to generate different obstruction and guidance effects on the gas. Then, it is discharged through the annular gap channel between the conical guide plate and the fixed ring, which helps to ensure the uniformity of gas distribution, effectively control the gas flow direction, and ensure the smooth discharge of the treated flue gas.

[0021] (3) The multi-stage sieve plate of this utility model is provided with multiple sets of air holes that are evenly spaced. The pore diameter of the air holes on the sieve plate gradually decreases from bottom to top, and the pore density gradually increases from bottom to top, which is conducive to further improving the uniformity of flue gas distribution.

[0022] (4) The present invention has several ammonia injection pipes evenly spaced on the reactor body corresponding to the denitrification reaction zone, which helps to ensure the uniformity of the denitrification reaction. Attached Figure Description

[0023] The dimensions and scales in the accompanying drawings do not represent the actual dimensions and scales of the product. The drawings are for illustrative purposes only, and some non-essential elements or features have been omitted for clarity.

[0024] Figure 1 This is a schematic diagram of the overall structure of the integrated desulfurization and denitrification reactor for coke oven flue gas of this utility model.

[0025] Figure 2 This is a cross-sectional schematic diagram of the integrated desulfurization and denitrification reactor of this utility model;

[0026] Figure 3 This is a schematic diagram of the overall structure of the gas flow equalization mechanism of this utility model;

[0027] Figure 4 This is a cross-sectional schematic diagram of the gas flow equalization mechanism of this utility model.

[0028] In the attached diagram: 1. Reactor body; 101. Desulfurization reaction zone; 102. Denitrification reaction zone; 2. Inlet pipe; 3. Ammonia injection pipe; 4. Outlet; 5. Gas flow equalization mechanism; 51. Fixing ring; 511. Cylindrical section; 512. Conical section; 52. Support frame; 53. Conical guide plate; 541. First sieve plate; 542. Second sieve plate; 543. Third sieve plate. Detailed Implementation

[0029] To further understand the present invention, a detailed description will be provided below with reference to the accompanying drawings and embodiments. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this disclosure. In the following detailed description, numerous specific details are set forth to provide a comprehensive understanding of the embodiments of this disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be implemented without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of this disclosure.

[0030] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0031] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0032] Furthermore, the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein.

[0033] Furthermore, the terms "comprising," "including," etc., used in this application indicate the presence of the stated features, steps, operations, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components. The terms "installed," "set up," "equipped with," "connected," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] Example

[0035] like Figure 1 , Figure 2 As shown, the coke oven flue gas desulfurization and denitrification integrated reactor of this embodiment includes a reactor body 1. An air inlet pipe 2 is connected to one side of the bottom of the reactor body 1, and an air outlet 4 is provided at the top. The bottom of the reactor body 1 is a desulfurization reaction zone 101. Above the desulfurization reaction zone 101 and below the gas flow equalization mechanism 5 is a denitrification reaction zone 102. A number of ammonia injection pipes 3 are evenly spaced on the reactor body 1 corresponding to the denitrification reaction zone 102. The ammonia injection pipes 3 are connected to the ammonia storage tank through pipes.

[0036] After the coke oven flue gas enters the reactor body 1 through the inlet pipe 2, it first undergoes desulfurization treatment in the desulfurization reaction zone 101. Then, when it passes through the denitrification reaction zone 102, ammonia gas or liquid ammonia is injected into the reactor body through the ammonia injection pipe 3, thereby carrying out the denitrification reaction of the flue gas.

[0037] To improve the uniformity of the treated flue gas output, this embodiment includes a gas flow equalization mechanism 5 installed on the top inner wall of the reactor body 1, such as... Figure 3 , Figure 4 As shown, the gas equalization mechanism 5 includes a fixed ring 51, a sieve plate, and a conical guide plate 53. The fixed ring 51 is mounted around the top inner wall of the reactor body 1, the sieve plate is mounted on the lower part of the inner wall of the fixed ring 51, and the conical guide plate 53 is supported on the top of the fixed ring 51, forming an annular gap channel for flue gas discharge between the conical guide plate 53 and the fixed ring 51. After desulfurization and denitrification treatment, the flue gas enters the gas equalization mechanism 5, first undergoes equalization treatment through the sieve plate, and then, guided by the guide plate, is discharged through the annular gap channel between the conical guide plate 53 and the fixed ring 51 to the gas outlet 4 at the top of the reactor body 1, and is discharged to the outside of the reactor through the gas outlet 4.

[0038] Furthermore, the fixed ring 51 includes a cylindrical section 511 and a conical section 512. The inner wall of the cylindrical section 511 is equipped with multi-stage sieve plates spaced apart along its height. Each of the multi-stage sieve plates has multiple sets of evenly spaced air holes, with the pore diameter gradually decreasing from bottom to top and the pore density gradually increasing from bottom to top. The conical section 512 is located above the cylindrical section 511, and its upper pore diameter is larger than its lower pore diameter. When the treated gas enters the gas equalization mechanism 5, the multi-stage sieve plates with different pore diameters and densities successively exert different obstruction and guidance effects on the gas. Then, guided by the conical section 512 and the conical guide plate 53, the gas flow direction changes and begins to move irregularly. In this way, the gas forms a complex and variable flow path during the process of passing through the equalization mechanism, and the gas velocity and flow direction are fully adjusted, ultimately achieving uniform distribution and effectively improving the gas treatment effect.

[0039] As a preferred embodiment, the sieve plate includes a first sieve plate 541, a second sieve plate 542 and a third sieve plate 543 arranged sequentially from bottom to top, and the air holes on the adjacent sieve plates are staggered to further improve the uniformity of flue gas distribution.

[0040] Specifically, in this embodiment, the upper outer side of the conical segment 512 is provided with a plurality of support frames 52 distributed at intervals along its circumference, and the conical guide plate 53 is supported and installed on the top of the conical segment 512 by the support frames 52. More preferably, the support frames 52 adopt an L-shaped structure.

[0041] As a further preferred embodiment, the bottom of the fixing ring 51 is also provided with a guide section (omitted in the figure). The guide section is a conical structure with an upper aperture smaller than the lower aperture. The guide section enables the gas flow equalization mechanism 5 to be installed on the inner wall of the reactor body, and also provides preliminary guidance for the treated flue gas to fully enter the gas flow equalization mechanism.

[0042] In some embodiments, a plurality of circular openings are provided on the surface of the reactor body 1 corresponding to the denitrification reaction zone 102. The ammonia injection pipe 3 is fixedly installed in the circular openings, with one end extending into the interior of the reactor body 1 and the other end connected to an ammonia storage tank via a pipe. More preferably, multiple sets of ammonia injection pipes 3 are installed at intervals along the height direction of the reactor body, each set including multiple ammonia injection pipes 3 spaced apart along the circumference of the reactor body, thereby further improving the uniformity and completeness of the denitrification reaction.

[0043] When in use, the composite desulfurizing agent is filled inside the bottom of the reactor body. Before filling, a layer of quartz sand is laid inside the bottom of the reactor body as a support layer. Then, the composite desulfurizing agent is slowly poured into the desulfurization reaction zone. The reactor body has a built-in spiral stirring shaft, which pre-stirs the desulfurizing agent. Next, sufficient liquid ammonia or ammonia water is injected into the external ammonia storage tank, and the ammonia injection pipeline is checked to ensure that it is working properly. The valve of the ammonia storage tank is opened, and ammonia is slowly charged into the ammonia delivery pipeline connected to the ammonia storage tank. The ammonia gas enters the ammonia injection pipeline through the ammonia delivery pipeline.

[0044] At this point, the coke oven flue gas is introduced into the reactor through the air inlet pipe. In the desulfurization reaction zone below, the sulfur dioxide in the gas is adsorbed by the composite desulfurizing agent and converted into stable substances such as calcium sulfate. The spiral stirring shaft continuously stirs the desulfurizing agent to ensure that the desulfurizing agent and the gas are in full contact, thus ensuring that the desulfurization reaction is fully carried out. After desulfurization, the gas enters the denitrification reaction zone. The ammonia injection pipe evenly injects ammonia into the reactor. Under the action of the catalyst, the nitrogen oxides in the gas undergo a selective catalytic reduction reaction with ammonia to generate nitrogen and water.

[0045] When the gas after desulfurization and denitrification enters the gas flow equalization mechanism, it first comes into contact with the sieve plate. Under the action of the multi-stage sieve plate, it can be divided into several groups of fine airflows and continue to rise, thereby breaking up any local high-speed or low-speed airflow regions in the gas, making the gas velocity and direction begin to become uniform. The gas then rises, and the divided gas is blocked and mixed by the conical guide plate. The conical guide plate itself does not have holes, and at this time, the mixed gas flows outward evenly along the edge of the conical guide plate, so that the gas can be evenly distributed when it leaves the gas flow equalization mechanism.

[0046] After the gas is evenly distributed through the gas equalization mechanism, it is discharged from the top of the reactor body.

[0047] The scope of protection of this utility model is defined only by the claims. Thanks to the teachings of this utility model, those skilled in the art will readily recognize that alternative structures to the disclosed structure can be used as feasible alternative implementations, and that the disclosed implementations can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. An integrated desulfurization and denitrification reactor for coke oven flue gas, comprising a reactor body (1), an inlet pipe (2) connected to one side of the bottom end of the reactor body (1), and an outlet (4) provided at the top, characterized in that, A gas flow equalization mechanism (5) is installed on the top inner wall of the reactor body (1), the gas flow equalization mechanism (5) comprising: A fixing ring (51) is installed around the top inner wall of the reactor body (1); Screen plates, multi-stage screen plates are installed at intervals along the height direction on the lower part of the inner wall of the fixing ring (51); And a conical guide plate (53), which is supported and installed on the top of the fixed ring (51), and an annular gap channel for flue gas discharge is formed between the conical guide plate (53) and the fixed ring (51). After the flue gas is treated by the gas equalization mechanism (5), it is discharged through the channel to the gas outlet (4) at the top of the reactor body (1).

2. The integrated desulfurization and denitrification reactor for coke oven flue gas according to claim 1, characterized in that, The fixing ring (51) includes a cylindrical section (511) and a conical section (512). Multi-stage sieve plates are installed at intervals along the height direction on the inner wall of the cylindrical section (511). The conical section (512) is located above the cylindrical section (511), and its upper aperture is larger than its lower aperture.

3. The integrated desulfurization and denitrification reactor for coke oven flue gas according to claim 2, characterized in that, The upper outer side of the conical section (512) is provided with several support frames (52) distributed circumferentially, and the conical guide plate (53) is supported and installed on the top of the conical section (512) by the support frames (52).

4. The integrated desulfurization and denitrification reactor for coke oven flue gas according to claim 2, characterized in that, The bottom of the fixing ring (51) is also provided with a guide section, which is a tapered structure with an upper aperture smaller than the lower aperture.

5. The integrated desulfurization and denitrification reactor for coke oven flue gas according to any one of claims 1-4, characterized in that, The multi-stage sieve plate has multiple sets of air holes that are evenly spaced and distributed. The pore size on the sieve plate gradually decreases from bottom to top, while the pore density gradually increases from bottom to top.

6. The integrated desulfurization and denitrification reactor for coke oven flue gas according to claim 5, characterized in that, The pores on adjacent sieve plates are staggered.

7. The integrated desulfurization and denitrification reactor for coke oven flue gas according to claim 6, characterized in that, The sieve plate includes a first sieve plate (541), a second sieve plate (542), and a third sieve plate (543) arranged sequentially from bottom to top.

8. The integrated desulfurization and denitrification reactor for coke oven flue gas according to any one of claims 1-4, characterized in that, The bottom of the reactor body (1) is the desulfurization reaction zone (101), and the top of the desulfurization reaction zone (101) and below the gas equalization mechanism (5) is the denitrification reaction zone (102). The reactor body (1) corresponding to the denitrification reaction zone (102) is provided with several ammonia injection pipes (3) evenly spaced.

9. The integrated desulfurization and denitrification reactor for coke oven flue gas according to claim 8, characterized in that, The reactor body (1) corresponding to the denitrification reaction zone (102) has several sets of circular openings on its surface. The ammonia injection pipe (3) is fixedly installed in the above-mentioned circular openings, with one end extending into the reactor body (1) and the other end connected to the ammonia storage tank.

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