Radial flow desulfurization and denitrification fixed bed and flue gas treatment system

Abstract

The utility model discloses a radial flow desulfurization and denitration fixed bed and flue gas treatment system belongs to flue gas separation denitration equipment technical field. The utility model discloses a shell, porous partition device, airflow access device and airflow uniform distribution subassembly, the front, rear side of shell each intercommunication one airflow access device, and the inside of shell is isolated at least two horizontal arrangement's chamber through porous partition device, and porous partition device is used for isolating material, and has a plurality of holes, and the intercommunication between adjacent chamber is used for the flue gas circulation, and the upper end of chamber is provided with material inlet, and the lower end is provided with material export, and the airflow access device in the flue gas inlet side is provided with airflow uniform distribution subassembly, and airflow uniform distribution subassembly is used for dividing the flue gas into several strands, and covering the effective reaction area of corresponding chamber. The utility model solves the problem of inconsistent service life of desulfurizer and denitration agent.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas desulfurization and denitrification equipment, and in particular to a radial flow desulfurization and denitrification fixed bed and flue gas treatment system. Background Technology

[0002] Among industrial flue gas desulfurization and denitrification technologies, fixed-bed dry desulfurization and denitrification technology is more environmentally friendly and economical. Chinese utility model patent ZL 202123297578.2, applied for on December 27, 2021, discloses a fixed-bed desulfurization and denitrification system. Figure 1 The attached figures are from the specification of this patent. Figure 2 To explain the usage of this patented technology, in common knowledge, desulfurizing agents and denitrifying agents cannot be mixed together for use. Given that this patented technology discloses that flue gas enters from the bottom and exits from the top of the fixed bed body, the desulfurizing and denitrifying agents in this patented technology cannot be arranged horizontally, but must be arranged in layers. If each layer of material is placed horizontally, waste cannot be discharged during material replacement. Therefore, the fabric cone 7 supporting the desulfurizing and denitrifying agents has a conical structure, such as... Figure 2 The meaning is as shown.

[0003] This patented technology has the following problems: First, during equipment use, operators need to calculate the theoretically required quantities of desulfurizing and denitrifying agents based on parameters such as flue gas volume and inlet / outlet sulfide and nitrogen oxide concentrations (assuming A tons of desulfurizing agent and B tons of denitrifying agent are needed). To avoid the influence of sulfides on the denitrifying agent, A tons of desulfurizing agent are loaded first, followed by B tons of denitrifying agent, i.e., the desulfurizing agent is placed below the denitrifying agent. However, operating conditions are constantly changing; the flue gas volume itself fluctuates, and the inlet sulfide and nitrogen oxide concentrations also change continuously. This leads to a discrepancy between the actual required quantities (usually based on a six-month guarantee period) and A and B, meaning that A and B represent desulfurization under the same lifespan. The theoretical values ​​for desulfurizing agents and denitrification agents are provided, but their actual lifespans differ. When the quantities of A and B correspond to different lifespans, it is necessary to replace A (partially or entirely) or B (partially or entirely) first. When partially or completely replacing the desulfurizing agent, all or part of it can be unloaded, and a certain amount of desulfurizing agent can be loaded on top. However, at this time, the desulfurizing agent (partially or entirely) is located above the denitrification agent, and sulfides will have a certain negative impact on the denitrification agent. When partially or completely replacing the denitrification agent, it is not feasible unless both the desulfurizing agent and denitrification agent are completely unloaded and reloaded. However, this will affect the operation of the entire system, leading to a certain period of production and operation stoppage, which is unacceptable to customers. Besides the critical issue mentioned above—the mismatch between the loading and actual demand of desulfurizing and denitrifying agents—which leads to mutual interference, during the loading process, although a distribution cone 1 is installed at the top, it is still impossible to achieve truly uniform material distribution. Uneven material layer thickness is inevitable, resulting in varying resistance at the airflow cross-section, easily causing localized rapid penetration and exceeding of standards. Third, near the distribution cone 2, the friction coefficient of the desulfurizing agent (or denitrifying agent) in direct contact is high, making it difficult to discharge during unloading. This results in a certain thickness of material layer remaining in the distribution cone 8 area, ultimately causing caking and other problems. This reduces the ventilation rate of the distribution cone 8, increases the resistance of the fixed bed, and affects system operation. Fourth… In the air inlet area, due to the limitations of the fixed bed structure, the flue gas has limited space for uniform distribution before passing through the desulfurizing and denitrifying agents after entering the fixed bed tower. This results in poor airflow uniformity, which can easily cause flow deviation and lead to rapid exceedance of indicators. In order to ensure smooth system operation and reduce operating costs (power consumption), the thickness of the fixed bed material layer is limited. Under this limitation, a larger number of fixed beds are required to process the same amount of flue gas, resulting in a larger footprint. Fifth, due to the uneven material layer thickness and the difficulty in unloading the material in the area of ​​the air distribution cone 8, it is difficult to control whether the material unloaded is desulfurizing or denitrifying agent when reaching the contact area of ​​the desulfurizing and denitrifying agents, especially at the contact area of ​​the desulfurizing and denitrifying agents, resulting in serious material waste.

[0004] The above lists several problems existing in the prior art. In order to solve some of these problems, it is of practical significance to propose a desulfurization and denitrification fixed bed and flue gas treatment system that is not difficult to replace due to the different lifespans of desulfurizing and denitrifying agents. Utility Model Content

[0005] The purpose of this invention is to propose a radial flow desulfurization and denitrification fixed bed and flue gas treatment system, which solves the problems of inconvenient replacement caused by the inconsistent lifespan of the desulfurizing agent and the denitrification agent.

[0006] The technical solution of this utility model is as follows: A radial flow desulfurization and denitrification fixed bed includes a shell, a porous baffle device, an airflow inlet / outlet device, and an airflow distribution assembly. The shell has an airflow inlet / outlet device connected to its front and rear sides. The shell's interior is separated into at least two horizontally arranged chambers by the porous baffle device. The porous baffle device is used to isolate materials and has several holes for flue gas to flow between adjacent chambers. Each chamber has a material inlet at its upper end and a material outlet at its lower end. The airflow distribution assembly is installed within the airflow inlet / outlet device on the flue gas inlet side. The airflow distribution assembly is used to divide the flue gas into several streams and cover the effective reaction area of ​​its corresponding chamber. The flue gas enters from the front airflow inlet / outlet device, is guided into the chamber by the airflow distribution assembly, and exits from the rear airflow inlet / outlet device after passing through each chamber in sequence.

[0007] As an alternative, the housing includes a main structure and a porous support device. The effective reaction areas on the front and rear sides of the main structure are respectively provided with openings. The porous support device is disposed at the openings of the main structure, and the flue gas inlet and outlet of the airflow inlet and outlet device covers the porous support device.

[0008] As an alternative, the porous support device adopts the same structure as the porous baffle device; and / or, the porous support device is divided into upper and lower half-zones, and each of the airflow inlet / outlet devices has two flue gas inlets and outlets, with each of the two flue gas inlets and outlets covering one half-zone.

[0009] As an alternative, the airflow inlet / outlet device includes a U-shaped airflow duct and a horn-shaped component. The airflow duct has a flue gas inlet / outlet in the middle, and each of the two ports is connected to a narrow opening of the horn-shaped component. The wide opening of the horn-shaped component is fixedly connected to the housing, and the wide openings of the two horn-shaped components on the same side cover the effective reaction area of ​​their corresponding compartments.

[0010] As an alternative, the airflow distribution assembly is fixed between the wide and narrow openings of the horn component. The airflow distribution assembly includes a horizontal guide and a diverging guide arranged front and rear. The horizontal guide is used to make the flue gas entering through the narrow opening of the horn component flow horizontally, and the diverging guide is used to divide the flue gas after passing through the horizontal guide into several diverging airflows. Each airflow is distributed vertically and completely covers the wide opening of the horn component.

[0011] As an alternative, the horizontal guide includes a uniformly distributed grid, the periphery of which is fixed to the inner surface of the horn member, and the holes of the uniformly distributed grid are horizontally arranged. The divergence guide includes a connecting plate and several upper and lower distributed guide plates. One end of the guide plate is fixed to the connecting plate, and the other end extends toward the wide opening of the horn component.

[0012] As an alternative, the porous partition device includes a porous plate and a support frame stacked and fixedly connected front and rear, with the edges of the porous plate and the support frame connected to the inner wall of the housing.

[0013] As an alternative, the perforation ratio of the perforated plate gradually decreases from top to bottom; and / or, the perforated baffle device is vertically arranged and perpendicular to the flue gas flow direction.

[0014] As an alternative, the interior of the shell is divided into three compartments by two of the porous partitions, at least one of which is used as a desulfurization compartment; or, the interior of the shell is divided into four compartments by three of the porous partitions, two of which are used as desulfurization compartments. As an alternative, the thickness of each compartment is the same in the direction of flue gas flow.

[0015] A flue gas treatment system includes a radial flow desulfurization and denitrification fixed bed as described in any one of the above claims and a conveying scraper conveyor, wherein the conveying scraper conveyor is located directly below the chamber and is used to receive waste material discharged from the chamber.

[0016] This utility model has at least the following beneficial effects: First, the compartments are arranged horizontally, with flue gas flowing radially and passing through each compartment sequentially. In practical applications, each compartment is used to fill the same material, with some compartments used as desulfurization compartments and others as denitrification compartments. Thus, the desulfurization and denitrification compartments are independent of each other. Each layer of desulfurizing agent or denitrifying agent can be loaded and unloaded completely independently without affecting the normal use of other material layers and the operation of the system. This fundamentally solves the problems of mutual interference and inconsistent life cycles of desulfurizing and denitrifying agents, which lead to difficulties in replacement, as well as the problem of not being able to treat them individually.

[0017] Secondly, the specific number of chambers can be left redundant during the equipment design stage, so that the number of desulfurization and denitrification chambers can be adjusted at any time according to the actual working conditions of sulfides and nitrogen oxides during actual application.

[0018] Third, unlike existing technologies, the material flow direction is still from top to bottom. However, in this utility model, the same material is loaded in the same compartment, so there is no need to set up multiple layers of fabric cones inside. It is only necessary to set up a funnel-shaped structure at the bottom of the compartment, avoiding the effective reaction area, to facilitate unloading. Therefore, when unloading the material, the material's own weight is sufficient to make the material flow downwards for unloading. There will be no large friction in the area of ​​the porous baffle device, which facilitates unloading and also avoids problems such as caking. Even if caking occurs at the funnel-shaped structure, it will not affect the reaction between the flue gas and the material.

[0019] Fourth, unlike existing technologies, the flue gas flow direction is no longer from bottom to top, but radial flow, that is, it enters from one side in the horizontal direction and exits from the other side. The effective reaction area can be set to be very large. Therefore, a large airflow distribution space can be set in the air inlet and outlet areas. At the same time, the airflow is guided by the airflow distribution component and makes it cover the effective reaction area, so as to better achieve airflow uniformity, avoid flow deviation, and improve the utilization efficiency of desulfurizing and denitrifying agents.

[0020] Fifth, without an airflow distribution component, flue gas may experience flow deviation, resulting in rapid consumption of desulfurizing and denitrifying agents in some areas while consumption is slower in others, ultimately leading to insufficient utilization of the desulfurizing and denitrifying agents. This invention, however, incorporates an airflow distribution component within the airflow inlet / outlet device on the flue gas inlet side, dividing the airflow into several streams and covering the effective reaction area. This avoids flow deviation and improves the utilization efficiency of the desulfurizing and denitrifying agents.

[0021] Sixth, when more desulfurizing agent or denitrifying agent is required according to working conditions, the fixed bed tower can be heightened without occupying more space on the plane. Attached Figure Description

[0022] The technical features and advantages of this utility model can be more fully understood by taking into account the accompanying drawings and the following detailed description.

[0023] Figure 1 This is a schematic diagram of an existing desulfurization and denitrification fixed bed.

[0024] Figure 2 This is a schematic diagram of the internal structure of an existing desulfurization and denitrification fixed bed.

[0025] Figure 3 This is a schematic diagram of a flue gas treatment system according to an embodiment of the present invention, which includes a radial flow desulfurization and denitrification fixed bed.

[0026] Figure 4This is a schematic diagram of the porous partition device according to an embodiment of the present invention. When fully displayed, the porous plate and the support frame appear slender from this perspective, so only one section is shown.

[0027] Figure 5 This is a schematic diagram of the airflow distribution component according to an embodiment of the present invention.

[0028] Figure label: This utility model comprises: 1. Shell; 11. Desulfurization chamber; 12. Denitrification chamber; 2. Porous baffle device; 21. Porous plate; 22. Support frame; 3. Manual insertion door; 4. Rotary rotary valve; 5. Airflow inlet / outlet device; 51. Airflow duct; 52. Horn component; 53. Flue gas inlet / outlet; 54. Airflow distribution assembly; 55. Distribution grid; 56. Guide plate; 57. Connecting plate; 6. Transport scraper conveyor.

[0029] Existing technologies: 7. Fabric cone; 8. Fabric air cone. Detailed Implementation

[0030] Unless otherwise defined, the technical or scientific terms used in this specification and claims shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0031] Before going into detail, let's explain some information in the accompanying diagram. This is for your convenience. Figure 3 The diagram illustrates the working principle of a radial flow desulfurization and denitrification fixed bed, with arrows indicating the directions of flue gas and materials, and the words "Flue Gas Direction" and "Material Flow Direction" labeled accordingly. To demonstrate the relationship between the airflow distribution component 54, the horn-shaped component 5252, and the flue gas, Figure 5 The diagram illustrates the direction of the flue gas and is labeled with the words "Flue Gas Direction".

[0032] refer to Figure 3-5 Understanding. This utility model embodiment provides a radial flow desulfurization and denitrification fixed bed for desulfurization and denitrification of industrial flue gas, which can be used in the fields of iron and steel metallurgy, silicon new material manufacturing, etc.

[0033] The radial flow desulfurization and denitrification fixed bed includes a shell 1, a porous baffle device 2, an airflow inlet / outlet device 5, and an airflow distribution assembly 54. The shell 1 provides space for the reaction of materials and flue gas. An airflow inlet / outlet device 5 is connected to the front and rear sides of the shell 1. The front airflow inlet / outlet device 5 allows flue gas to enter the shell 1, and the rear airflow inlet / outlet device 5 allows flue gas to exit the shell 1. The shell 1 is separated into at least two horizontally arranged compartments by the porous baffle device 2. The porous baffle device 2 is used to isolate materials and has several holes for flue gas to flow between adjacent compartments. At least one compartment is used as a desulfurization compartment 11, and at least one compartment is used as a denitrification compartment 12. The desulfurization compartment 11 is located on the flue gas inlet side, and the denitrification compartment 12 is located on the flue gas outlet side. The direction of the compartment arrangement is the same as the direction of flue gas inlet / outlet, so that the flue gas can pass through each compartment sequentially. During the flue gas flow, desulfurization occurs first, followed by denitrification. The airflow inlet / outlet device 5 on the flue gas inlet side is equipped with an airflow distribution assembly 54 to ensure that the flue gas is evenly diffused into the effective reaction area of ​​the corresponding compartment. The upper end of the chamber has a material inlet, and the lower end has a material outlet, meaning the material is fed in from the top and discharged from the bottom. In application, the corresponding desulfurizing and denitrifying agents are filled into the chamber. Flue gas enters through the front airflow inlet / outlet device 5, is evenly guided into the chamber by the airflow distribution component 54, and then exits through the rear airflow inlet / outlet device 5 after passing through each desulfurization chamber 11 and denitrification chamber 12. It should be noted that, firstly, the effective reaction area mentioned in this invention is the area filled with material of uniform thickness, such as... Figure 3 In the middle, the chamber has a straight cylindrical section with uniform thickness and a conical section at the bottom. The material thickness in the straight cylindrical section is uniform, so the straight cylindrical section area of ​​the front and rear chambers corresponds to the effective reaction area. The purpose of setting the conical section is to facilitate the discharge of materials, so the conical section is not related to the effective reaction area. Second, the front and rear sides here are used to indicate the relative positions of flue gas inflow and outflow, that is, the flue gas does not flow vertically, but horizontally. The front and rear sides can also be referred to as the left and right sides.

[0034] Therefore, it can be seen that this utility model has at least the following effects: First, the compartments are arranged horizontally, and the flue gas flows radially and passes through each compartment in sequence. In practical applications, each compartment is used to fill the same material. Some compartments are used as desulfurization compartment 11, and some compartments are used as denitrification compartment 12. Thus, desulfurization compartment 11 and denitrification compartment 12 are independent of each other. Each layer of desulfurizing agent or denitrifying agent can be loaded and unloaded completely independently without affecting the normal use of other material layers and the operation of the system. This fundamentally solves the problems of mutual interference between desulfurizing agents and denitrifying agents, inconsistent life cycles, and inability to treat each other specifically.

[0035] Secondly, the specific number of chambers can be reserved during the equipment design stage, so that the number of desulfurization chamber 11 and denitrification chamber 12 can be adjusted at any time according to the actual working conditions of sulfides and nitrogen oxides during actual application.

[0036] Third, unlike existing technologies, the material flow direction is still from top to bottom. However, in this utility model, the same material is loaded in the same compartment, so there is no need to set up multiple layers of fabric cones inside. It is only necessary to set up a funnel-shaped structure at the bottom of the compartment, avoiding the effective reaction area, to facilitate unloading. Therefore, when unloading the material, the material's own weight is sufficient to make the material flow downwards for unloading. There will be no large friction in the area of ​​the porous baffle device 2, which facilitates unloading and also avoids problems such as caking. Even if caking occurs at the funnel-shaped structure, it will not affect the reaction between the flue gas and the material.

[0037] Fourth, unlike existing technologies, the flue gas flow direction is no longer from bottom to top, but radial, that is, it enters from one side in the horizontal direction and exits from the other side. The effective reaction area can be set to be very large. Therefore, a large airflow distribution space can be set in the air inlet and outlet areas. At the same time, the airflow is guided by the airflow distribution component 54 and makes it cover the effective reaction area, so as to better achieve airflow uniformity, avoid flow deviation, and improve the utilization efficiency of desulfurizing agent and denitrifying agent.

[0038] Fifth, without the airflow equalization component 54, the flue gas may be deflected, resulting in rapid consumption of desulfurizing and denitrifying agents in some areas while consumption is slower in others, ultimately leading to insufficient utilization of the desulfurizing and denitrifying agents. This invention, by incorporating the airflow equalization component 54 within the airflow inlet / outlet device 5 on the flue gas inlet side, divides the airflow into several streams, covering the effective reaction area, thereby avoiding the deflection phenomenon and improving the utilization efficiency of the desulfurizing and denitrifying agents.

[0039] Sixth, when more desulfurizing agent or denitrifying agent is required according to working conditions, the fixed bed tower can be heightened without occupying more space on the plane.

[0040] The following section will elaborate on each part of the radial flow desulfurization and denitrification fixed bed.

[0041] The areas on the housing 1 used for smoke inlet and outlet are designed with a porous structure, while other areas prevent smoke leakage. The housing 1 includes a main structure and a porous support device. The effective reaction areas on the front and rear sides of the main structure are respectively provided with openings. The porous support device is located at the openings of the main structure, and the edges of the porous support device connect to the perimeter of the openings. In some embodiments, the porous support device adopts the same structure as the porous baffle device 2, which can both allow smoke to flow and block materials. See the subsequent description of the porous baffle device 2 for details.

[0042] The flue gas inlet and outlet of the airflow inlet and outlet device 5 is covered by a porous support device. In some embodiments, the airflow inlet and outlet device 5 may be provided with a single flue gas inlet and outlet that covers the entire effective reaction area. However, in order to more effectively distribute the airflow to various locations within the effective reaction area... Figure 3 In the embodiment, each airflow inlet / outlet device 5 is provided with two flue gas inlets and outlets. Correspondingly, the porous support device is divided into upper and lower half-zones, with each of the two flue gas inlets and outlets covering one half-zone.

[0043] Figure 3 In this embodiment, the airflow inlet / outlet device 5 includes a U-shaped airflow duct 51 and a horn-shaped component 52. A flue gas inlet / outlet 53 is provided in the middle of the airflow duct 51. The flue gas inlet / outlet 53 on the inlet side is connected to the boiler's exhaust port, and the flue gas inlet / outlet 53 on the outlet side is connected to the flue gas discharge duct. Each of the two ends of the U-shaped airflow duct 51 is connected to the narrow opening of a horn-shaped component 52. The wide opening of the horn-shaped component 52 is fixedly connected to the housing 1. The wide openings of the two horn-shaped components 52 on the same side cover the effective reaction area of ​​their corresponding chambers. Flue gas enters through the flue gas inlet / outlet 53 on the desulfurization chamber 11 side, enters the two horn-shaped components 52 through the airflow duct 51, receives a brief buffer within the horn-shaped components 52, and enters the chamber under the guidance of the airflow distribution component 54. It then passes sequentially through the desulfurization chamber 11 and the denitrification chamber 12, and exits from the airflow inlet / outlet device 5 on the denitrification chamber 12 side.

[0044] An airflow distribution component 54 is fixed between the wide and narrow openings of the horn-shaped component 52. The airflow distribution component 54 includes a horizontal guide and a diverging guide arranged front and rear. The horizontal guide ensures the flue gas entering through the narrow opening of the horn-shaped component 52 flows horizontally, while the diverging guide divides the flue gas after passing through the horizontal guide into several diverging airflows. These airflows are distributed vertically and completely cover the wide opening of the horn-shaped component 52. Without the airflow distribution component 54, the flue gas collides with the inner wall of the horn-shaped component 52 after entering, generating multiple airflow vortices. Furthermore, due to the inherent velocity of the airflow, most of it will flow towards a localized area within the effective reaction zone, causing flow deviation. This results in rapid consumption of desulfurizing and denitrifying agents in some areas, while consumption is slower in others, ultimately leading to insufficient utilization of the desulfurizing and denitrifying agents. This invention first uses the horizontal guide to ensure horizontal flue gas flow, and then uses the diverging guide to diffuse the flue gas in a predetermined direction, effectively reducing vortices generated within the airflow and ensuring uniform airflow coverage of the effective reaction zone.

[0045] Specifically, the horizontal guide includes a uniformly distributed grid 55, which includes several fixedly connected plates. The holes of the uniformly distributed grid 55 are horizontally arranged, which enables the flue gas entering the horn member 52 to flow horizontally quickly and prevents the flue gas from forming several small airflow vortices in the horn member 52 and causing deflection. The periphery of the uniformly distributed grid 55 is fixed to the inner surface of the horn member 52.

[0046] The divergence guide includes a connecting plate 57 and several upper and lower distributed guide plates 56. One end of the guide plate 56 is fixed to the connecting plate 57, and the other end extends towards the wide opening of the horn-shaped component 52. The connecting plate 57 can be directly fixed to the inner wall of the horn-shaped component 52 or fixed to the uniformly distributed grid 55. The guide plates 56 divide the flue gas into several streams and evenly guide these streams to various areas of the wide opening of the horn-shaped component 52, achieving comprehensive and effective utilization of the desulfurizing agent and denitrifying agent, and avoiding the problems of flow deviation and premature material penetration in some areas.

[0047] The porous baffle device 2 includes a porous plate 21 stacked and fixedly connected to a support frame 22, which can be welded together. The edges of the porous plate 21 and the support frame 22 are connected to the inner wall of the housing 1. In some embodiments, porous plates 21 are respectively provided on both sides of the support frame 22, but as an alternative, porous plates 21 can be provided on only one side of the support frame 22. In some embodiments, the thickness of the desulfurization chamber 11 and the thickness of the denitrification chamber 12 are the same in the direction of flue gas flow, that is, the porous baffle devices 2 are evenly distributed. In specific implementation, multiple layers are set according to the needs of each project, and the thickness of each layer is determined according to the design requirements (for example, set to 1 meter). Then, when each layer is filled, the thickness of the layer corresponding to the effective reaction area is 1 meter, and there is no situation of uneven layer thickness, which fundamentally solves the problem of uneven layer thickness.

[0048] The perforated plate 21 is a plate with numerous pores for flue gas flow. The perforated plate 21 is a 3-5mm thick steel plate made of 304 or 316L stainless steel with elongated holes, and the perforation rate is between 30% and 60%, with the specific value determined based on resistance and air velocity. Simultaneously, considering the different material bulk densities and the upward movement of hot gas, the perforation rate gradually decreases from bottom to top along the height direction. Furthermore, the size of the pores on the perforated plate 21 is insufficient for the desulfurizing and denitrifying agents to pass through; that is, the perforated plate 21 also serves to block the desulfurizing and denitrifying agents. The perforated baffle device 2 is preferably vertically installed, perpendicular to the flue gas flow direction, so that when the desulfurizing and denitrifying agents are discharged, the material falls under gravity and does not remain on the perforated plate 21, thus preventing easy caking and blockage of the pores.

[0049] The periphery of the support frame 22 is fixed inside the shell 1. The support frame 22 serves to fix and support the perforated plate 21. It can adopt a structure similar to steel grating. The thickness, height, spacing and other data of the stiffeners are calculated according to the load data.

[0050] It should be noted that due to the different characteristics of flue gas from different furnaces, including variations in flow rate, sulfide content, nitrogen oxide concentration, and permissible emission standards, the number and dimensions of desulfurization chambers 1111 and denitrification chambers 1212 will differ across projects. The length and height of the chambers can be determined based on the flue gas velocity (typically 0.3 m / s - 0.5 m / s), while the number of chambers and the material layer thickness can be determined based on the permissible system resistance and refueling cycle. The number of porous baffle devices 2 can be set according to the required number of desulfurization chambers 11 and denitrification chambers 12. Figure 3 In the illustrated embodiment, the interior of the shell 1 is divided into four side-by-side compartments by three porous partitions 2, two of which are used as desulfurization compartments 11 and the other two as denitrification compartments 12; in other embodiments, the interior of the shell 1 can also be divided into three compartments by two porous partitions 2, one of which is used as a desulfurization compartment 11 and the other two as denitrification compartments 12, or one of which is used as a denitrification compartment 12 and the other two as desulfurization compartments 11.

[0051] Additionally, inside the shell 1, the discharge ports of the desulfurization chamber 11 and the denitrification chamber 12 are funnel-shaped to facilitate material unloading. Each discharge port is equipped with a manual gate valve 3 and a rotary valve 4; these valves are opened during unloading.

[0052] Continue to refer to Figure 5 The present invention also provides a flue gas treatment system, including the above-mentioned radial flow desulfurization and denitrification fixed bed and the conveying scraper 6. The conveying scraper 6 is arranged below the desulfurization chamber 11 and the denitrification chamber 12 and is used to receive the waste material discharged from the desulfurization chamber 11 and the denitrification chamber 12.

[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A radial flow desulfurization and denitrification fixed bed, characterized in that, The device includes a housing, a porous baffle device, an airflow inlet / outlet device, and an airflow distribution assembly. The housing has an airflow inlet / outlet device connected to its front and rear sides. The housing interior is separated into at least two horizontally arranged chambers by the porous baffle device. The porous baffle device is used to isolate materials and has several holes for flue gas to flow between adjacent chambers. Each chamber has a material inlet at its upper end and a material outlet at its lower end. The airflow inlet / outlet device on the flue gas inlet side houses the airflow distribution assembly, which divides the flue gas into several streams and covers the effective reaction area of ​​its corresponding chamber. The flue gas enters from the front airflow inlet / outlet device, is guided into the chamber by the airflow distribution assembly, and exits from the rear airflow inlet / outlet device after passing through each chamber in sequence.

2. The radial flow desulfurization and denitrification fixed bed according to claim 1, characterized in that, The housing includes a main structure and a porous support device. The effective reaction areas on the front and rear sides of the main structure are respectively provided with openings. The porous support device is disposed at the opening of the main structure. The flue gas inlet and outlet of the airflow inlet and outlet device covers the porous support device.

3. The radial flow desulfurization and denitrification fixed bed according to claim 2, characterized in that, The porous support device adopts the same structure as the porous baffle device; and / or, the porous support device is divided into upper and lower half-zones, and each of the airflow inlet and outlet devices has two flue gas inlets and outlets, each of which covers one half-zone.

4. The radial flow desulfurization and denitrification fixed bed according to claim 1, characterized in that, The airflow inlet and outlet device includes a U-shaped airflow duct and a horn. The airflow duct has a flue gas inlet and outlet in the middle, and each of the two ports is connected to a narrow opening of the horn. The wide opening of the horn is fixedly connected to the housing. The wide openings of the two horns on the same side cover the effective reaction area of ​​their corresponding compartments.

5. The radial flow desulfurization and denitrification fixed bed according to claim 4, characterized in that, The airflow distribution component is fixed between the wide and narrow openings of the horn component. The airflow distribution component includes a horizontal guide and a diverging guide arranged front and rear. The horizontal guide is used to make the flue gas entering through the narrow opening of the horn component flow horizontally. The diverging guide is used to divide the flue gas after passing through the horizontal guide into several diverging airflows. Each airflow is distributed vertically and completely covers the wide opening of the horn component.

6. The radial flow desulfurization and denitrification fixed bed according to claim 5, characterized in that, The horizontal guide includes a uniformly distributed grid, the periphery of which is fixed to the inner surface of the horn member, and the holes of the uniformly distributed grid are horizontally arranged. The divergence guide includes a connecting plate and several upper and lower distributed guide plates. One end of the guide plate is fixed to the connecting plate, and the other end extends toward the wide opening of the horn component.

7. The radial flow desulfurization and denitrification fixed bed according to claim 1, characterized in that, The porous partition device includes a porous plate and a support frame that are stacked and fixedly connected, with the edges of the porous plate and the support frame connected to the inner wall of the housing.

8. The radial flow desulfurization and denitrification fixed bed according to claim 7, characterized in that, The perforation rate of the perforated plate gradually decreases from top to bottom; and / or, the perforated baffle device is vertically arranged and perpendicular to the flue gas flow direction.

9. The radial flow desulfurization and denitrification fixed bed according to any one of claims 1-8, characterized in that: The interior of the shell is divided into three compartments by two porous partitions, at least one of which is used as a desulfurization compartment; or, the interior of the shell is divided into four compartments by three porous partitions, two of which are used as desulfurization compartments. The thickness of each compartment is the same in the direction of flue gas flow.

10. A flue gas treatment system, characterized in that, The invention includes a radial flow desulfurization and denitrification fixed bed and a conveyor scraper as described in any one of claims 1-9, wherein the conveyor scraper scraper is located directly below the chamber and is used to receive waste material discharged from the chamber.

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