Composite dry desulfurization device

Abstract

A composite dry-type desulfurization device belongs to the technical field of waste gas treatment and comprises a tower body, a smoke inlet is formed in the bottom of the tower body, a primary desulfurization area is fixedly arranged in the tower body, and a secondary desulfurization area is fixedly arranged on the outer wall of the tower body; the second-stage desulfurization area is spirally arranged in the axial direction of the tower body, the top end of the second-stage desulfurization area is located above the first-stage desulfurization area, the top end of the second-stage desulfurization area is communicated with the first-stage desulfurization area, the first-stage desulfurization area and the second-stage desulfurization area are arranged, the effect of enhancing the desulfurization performance through two-section type coupling is achieved, efficient integration and cascade treatment are achieved, and the desulfurization efficiency is improved. And the secondary desulfurization area is spirally arranged, so that the desulfurization area is increased, the overall adaptive capacity is improved, different treatment requirements can be met, and the problems of single desulfurization treatment mode, insufficient treatment capacity and poor economical efficiency in the existing dry desulfurization application are solved.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and in particular to a composite dry desulfurization device. Background Technology

[0002] Currently, there are many types of flue gas desulfurization processes in boilers, industrial kilns, and other fields. Common types include wet, semi-dry, and dry desulfurization. Under certain operating conditions where the flue gas volume and SO2 concentration are not very large, dry desulfurization systems are increasingly being used due to their simple process, no wastewater, low operating costs, and convenient maintenance.

[0003] However, under conditions of high SO2 concentration, dry desulfurization faces the problem of insufficient processing capacity. In the single application of common dry desulfurization technologies such as fixed bed, moving bed, and SDS (sodium bicarbonate), a large amount of calcium or sodium-containing desulfurizing agent is required to achieve a certain desulfurization effect, resulting in an excessively high calcium-to-sulfur ratio or sodium-to-sulfur ratio. A high calcium-to-sulfur ratio or sodium-to-sulfur ratio means that the desulfurizing agent is not fully utilized, resulting in the waste of some desulfurizing agent and increasing the desulfurization cost. Utility Model Content

[0004] To address the technical problems of existing dry desulfurization applications, such as limited desulfurization methods, insufficient processing capacity, and poor economic efficiency, this invention provides a composite dry desulfurization device.

[0005] The technical solution of this utility model is as follows:

[0006] This utility model provides a composite dry desulfurization device, including a tower body with a flue gas inlet at the bottom. A primary desulfurization zone is fixedly arranged inside the tower body, and a secondary desulfurization zone is fixedly arranged on the outer wall of the tower body. The secondary desulfurization zone is spirally arranged along the axial direction of the tower body, with its top located above the primary desulfurization zone and connected to it. By setting up a primary and a secondary desulfurization zone, and with the secondary desulfurization zone spirally arranged, the desulfurization area is increased, the desulfurization process is enriched, the desulfurization methods are diversified, and the overall adaptability is improved, enabling it to meet different treatment needs.

[0007] Preferably, a clean flue gas cyclone chamber is fixedly installed inside the tower body. The primary desulfurization zone is connected to the secondary desulfurization zone through the clean flue gas cyclone chamber. The setting of the clean flue gas cyclone chamber allows the flue gas from the primary desulfurization zone to enter the secondary desulfurization zone in a specific cyclone pattern, which optimizes the flow path of the flue gas in different desulfurization zones, further improves the desulfurization effect, and enhances the adaptability of the device.

[0008] Preferably, the flue gas cyclone chamber includes a cyclone chamber, in which a compartment partition is fixedly installed. The compartment partition is composed of several layers of strip-shaped inclined plates. There is space between the inclined plates in the same layer for accommodating particulate desulfurizing agent, and there is a gap between the inclined plates of adjacent layers to allow flue gas to be discharged. The bottom of the compartment partition is connected to the primary desulfurization zone, and the cyclone chamber is connected to the secondary desulfurization zone. The compartment partition can guide the particulate desulfurizing agent so that the particulate desulfurizing agent can fall accurately into the primary desulfurization zone and prevent the particulate desulfurizing agent from entering the cyclone chamber with the flue gas.

[0009] Preferably, the cross-sectional area of ​​the flue gas flow in the cyclone chamber gradually increases along the direction of flue gas flow to maintain a reasonable flow field, providing more favorable conditions for the full reaction of the powder desulfurizing agent and the flue gas, further improving the desulfurization effect, enhancing the device's adaptability to flue gas with different flow velocities, and reducing resistance to ensure smooth flue gas flow.

[0010] Preferably, a first feed inlet is provided at the top of the tower, and a second feed inlet is provided at the connection between the cyclone chamber and the secondary desulfurization zone. There are several second feed inlets, and these several second feed inlets completely cover the flue gas flow section of the cyclone chamber, so that the flue gas can fully contact and react with the powdered desulfurizing agent, thereby improving the utilization rate of the desulfurizing agent and the desulfurization effect.

[0011] Preferably, the tower body operates under negative pressure, and a pressure stabilizing silo is fixedly installed inside the tower body. The pressure stabilizing silo is fixedly located above the clean flue gas cyclone chamber and is connected to the inner cavity of the clean flue gas cyclone chamber, which can prevent air from entering the primary desulfurization zone from the first feed inlet.

[0012] Preferably, the lowest end of the secondary desulfurization zone is the desulfurization outlet, which is connected to a dust collector. This dust collector can trap desulfurization byproducts and unreacted desulfurizing agent powder, and further remove impurities from the flue gas after desulfurization, thereby improving the quality of the clean flue gas and making the desulfurization effect of the entire desulfurization unit better.

[0013] Preferably, the tower bottom is provided with a primary by-product outlet and the dust collector is provided with a secondary by-product outlet, which facilitates the separate collection of primary and secondary desulfurization by-products, and is conducive to the classification, treatment and recycling of by-products, thereby improving resource utilization efficiency and enhancing the adaptability of the equipment in terms of environmental protection and resource treatment.

[0014] As can be seen from the above technical solutions, the advantages of this utility model are:

[0015] By setting up a primary desulfurization zone and a secondary desulfurization zone, with the secondary desulfurization zone spirally arranged, a two-stage coupled desulfurization performance is achieved. This efficient integration and tiered treatment increases the desulfurization area, improves the overall adaptability, and can meet different treatment needs. Furthermore, the secondary desulfurization zone is spirally arranged axially on the outer wall of the tower, which enhances the turbulence effect and promotes the secondary desulfurization reaction. While extending the flue gas path, it effectively utilizes the external space of the tower without excessively occupying external space, ensuring the compactness of the desulfurization device structure and avoiding excessive size, thus guaranteeing space utilization. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the composite dry desulfurization device according to one or more embodiments of the present invention.

[0018] Figure 2 This is a schematic diagram of the main structure of the clean smoke cyclone chamber according to one or more embodiments of the present invention;

[0019] Figure 3 This is a top view of the clean smoke cyclone chamber according to one or more embodiments of the present invention.

[0020] The components represented by the various reference numerals in the diagram are:

[0021] 1. Tower body; 2. Flue gas inlet; 3. Primary desulfurization zone; 4. Clean flue gas cyclone chamber; 5. Secondary desulfurization zone; 6. Pressure stabilizing silo; 7. Cyclone chamber; 8. First feed inlet; 9. Second feed inlet; 10. Desulfurization outlet; 11. Dust collector; 12. Primary by-product outlet; 13. Secondary by-product outlet; 14. Compartment partition; 15. Granular desulfurizing agent; 16. Powder desulfurizing agent; 17. Inclined plate. Detailed Implementation

[0022] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0023] In a typical embodiment of this utility model, such as Figures 1-3 As shown, a composite dry desulfurization device is proposed, comprising: a tower body 1, a primary desulfurization zone 3, and a secondary desulfurization zone 5. The bottom of the tower body 1 is provided with a flue gas inlet 2, through which flue gas enters the tower body 1. The primary desulfurization zone 3 is located inside the tower body 1 and is a vertical fixed-bed desulfurization reaction zone. The desulfurizing agent is a calcium-based granular desulfurizing agent 15. The top of the tower body 1 is provided with a first feed inlet 8 for feeding the granular desulfurizing agent 15 into the tower body 1. Because the desulfurizing agent layer in the primary desulfurization zone 3 has a stacked structure and granular surface... The microporous structure of the surface, in addition to desulfurization, also has the functions of synergistic dust removal, water removal, and VOCs (volatile organic compounds) removal; the secondary desulfurization zone 5 is set outside the tower body 1 and is fixedly connected to the outer wall of the tower body 1. The secondary desulfurization zone 5 has a spiral structure. The top of the secondary desulfurization zone 5 is located above the primary desulfurization zone 3 and is connected to the primary desulfurization zone 3. A second feed inlet 9 is provided near the top of the secondary desulfurization zone 5. The second feed inlet 9 is used to feed the powder desulfurizing agent 16 into the secondary desulfurization zone 5.

[0024] Flue gas enters tower 1 through inlet 2 and undergoes primary desulfurization in primary desulfurization zone 3. After primary desulfurization, the flue gas then enters secondary desulfurization zone 5 for secondary desulfurization, thus achieving cascaded treatment of the flue gas. The combination of primary desulfurization zone 3 and the spiral-structured secondary desulfurization zone 5 creates a two-stage coupled effect that enhances desulfurization performance. This efficient integration and cascaded treatment effectively utilizes the internal and external space of tower 1, further extending the flue gas flow path and thus extending the desulfurization time. Within a limited space, this effectively improves the flue gas treatment capacity. Furthermore, the treatment capacity can be adjusted according to the flue gas concentration. For example, when the flue gas concentration is high, desulfurizing agent is added to both primary desulfurization zone 3 and secondary desulfurization zone 5 to increase desulfurization capacity; when the flue gas concentration is low, desulfurizing agent is added only to primary desulfurization zone 3, or the amount of desulfurizing agent in both zones is reduced to meet different treatment needs and avoid waste of desulfurizing agent.

[0025] The secondary desulfurization zone 5 has a spiral structure and is fixedly installed on the outer wall of the tower body 1. The secondary desulfurization zone 5 is spirally arranged along the axial direction of the tower body 1, which enhances the turbulence effect and promotes the secondary desulfurization reaction effect. While extending the flue gas path, it effectively utilizes the external space of the tower body 1 without occupying too much external space of the tower body 1, ensuring the compactness of the desulfurization device (i.e., the desulfurization tower) structure, avoiding excessive volume of the desulfurization device, and ensuring space utilization.

[0026] The bottom of the tower body 1 is provided with a primary by-product outlet 12. The primary by-product outlet 12 is an electrically controlled structure used to control the discharge of by-products from the primary desulfurization zone 3. After the primary by-products are collected, since the main component is calcium sulfate, they can be reused in sintering, pelletizing and other production processes.

[0027] like Figure 1 As shown, a clean flue gas cyclone chamber 4 is also fixedly installed inside the tower body 1. The clean flue gas cyclone chamber 4 is located above the primary desulfurization zone 3. The clean flue gas cyclone chamber 4 is connected to the primary desulfurization zone 3 and the secondary desulfurization zone 5 respectively. After the flue gas in the primary desulfurization zone 3 is treated, it enters the secondary desulfurization zone 5 through the clean flue gas cyclone chamber 4 to complete the multi-stage treatment of the flue gas.

[0028] like Figure 2 and Figure 3 As shown, the clean smoke swirl chamber 4 includes a partition plate 14 and a swirl chamber 7. The swirl chamber 7 is a rotating structure. As the flue gas flowing uniformly out from the periphery of the partition plate 14 gathers into the swirl chamber 7, the cross-section of the swirl chamber 7 needs to become larger and larger. Therefore, the swirl chamber 7 gradually diffuses along the direction of flue gas flow, that is, the cross-sectional area of ​​flue gas flow in the swirl chamber 7 gradually increases along the direction of flue gas flow to maintain a reasonable flow field, effectively reduce resistance, and ensure smooth flue gas flow. The partition plate 14 is fixedly installed in the swirl chamber. Inside the cyclone chamber 7, the partition plate 14 is coaxially arranged and connected to the cyclone chamber 7. The bottom of the partition plate 14 is connected to the primary desulfurization zone 3. The partition plate 14 is composed of several layers of strip-shaped inclined plates 17. There is space between the inclined plates 17 in the same layer for accommodating particulate desulfurizing agent 16. In this embodiment, the several strip-shaped inclined plates 17 in each layer are combined into a ring to limit the particulate desulfurizing agent 16 and prevent the particulate desulfurizing agent 16 from entering the cyclone chamber 7. There is space between the inclined plates 17 of adjacent layers to allow flue gas to be discharged. The gap allows the flue gas to react and separate with the granular desulfurizing agent 16 within the space enclosed by the partition plate 14. The flue gas then enters the cyclone chamber 7 and is guided to the secondary desulfurization zone 5. The flue gas flow cross-sectional area at the outlet of the cyclone chamber 7 is the largest, and the outlet of the cyclone chamber 7 is fixedly connected to the top of the secondary desulfurization zone 5. A second feed inlet 9 is provided at the connection between the cyclone chamber 7 and the secondary desulfurization zone 5 for the addition of powdered desulfurizing agent 17. Specifically, the flue gas and materials react and separate within the clean flue gas cyclone chamber 7. Convection occurs at four points in the flow chamber. The rising flue gas flows into the external swirl chamber 7 through the gaps in the stacked partition plates 14, while the granular desulfurizing agent 15 flowing downwards is blocked inside the partition plates 14, thus ensuring that the granular desulfurizing agent 15 can smoothly and steadily enter the primary desulfurization zone 3. The primary desulfurization zone 3 performs preliminary desulfurization and removes other impurities. As the reaction proceeds, the material layer is conveyed downwards, discharging the desulfurizing agent with reduced activity and by-products together, while highly active desulfurizing agent is replenished from the top of the tower 1.

[0029] It is understood that in other embodiments, the several strip-shaped inclined plates 17 in each layer can also be arranged into other shapes, such as square rings, etc. The specific selection can be made according to actual needs, and no further restrictions are imposed here.

[0030] In this embodiment, there are several second feed inlets 9, which are located at the top of the cyclone chamber 7 and completely cover the flue gas flow section of the cyclone chamber 7 to improve the utilization rate of the desulfurizing agent.

[0031] Tower body 1 operates under negative pressure, such as Figure 1 As shown, a pressure stabilizing silo 6 is also fixedly installed inside the tower body 1. The pressure stabilizing silo 6 is fixedly installed above the clean flue gas cyclone chamber 4. The space enclosed by the pressure stabilizing silo 6 and the partition plate 14 is connected. The bottom of the pressure stabilizing silo 6 is connected to the first feed inlet 8. The granular desulfurizing agent 15 enters the pressure stabilizing silo 6 through the first feed inlet 8 for temporary storage. After the first-stage by-product outlet 12 is opened to discharge the by-product, the fresh granular desulfurizing agent 15 in the pressure stabilizing silo 6 is fed into the first-stage desulfurization zone 3 through the clean flue gas cyclone chamber 4. The setting of the pressure stabilizing silo 6 can prevent air from entering the first-stage desulfurization zone 3 from the first feed inlet 8. The granular desulfurizing agent 15 is added at the first feed inlet 8 using a ton bag.

[0032] The lowest end of the secondary desulfurization zone 5 is the desulfurization outlet 10. After the flue gas in the primary desulfurization zone 3 enters the secondary desulfurization zone 5 through the clean flue gas cyclone chamber 4, it flows spirally along the secondary desulfurization zone 5 from top to bottom and reacts with the powdered desulfurizing agent 16 during the flow. Finally, it is discharged through the desulfurization outlet 10. A dust collector 11 is also connected to the desulfurization outlet 10. In this embodiment, the dust collector 11 is a bag filter dust collector for treating the discharged flue gas. It can intercept desulfurization by-products and unreacted desulfurizing agent powder, and further remove impurities in the desulfurized flue gas, improve the quality of the clean flue gas, and prevent the flue gas from carrying dust. The treated clean flue gas is discharged from the dust collector 11. The dust collector 11 is also equipped with a secondary by-product outlet 13, which is also electrically controlled.

[0033] The specific working principle is as follows:

[0034] The raw flue gas enters the primary desulfurization zone 3 from the bottom through the inlet 2 for preliminary purification. The pre-purified flue gas is then transported to the top of the primary desulfurization zone 3 and enters the clean flue gas cyclone chamber 4. The flue gas and materials undergo convective separation in the clean flue gas cyclone chamber 4. The rising flue gas flows into the external cyclone chamber 7 through the gaps in the stacked partition plates 14, while the granular desulfurizing agent 15 flowing downwards is blocked inside the partition plates 14, thus ensuring that the granular desulfurizing agent 15 can smoothly and stably enter the primary desulfurization zone 3. The primary desulfurization zone 3 performs preliminary desulfurization and removes other impurities. As the reaction proceeds, the material layer is conveyed downwards, discharging the desulfurizing agent with reduced activity and byproducts. Simultaneously, highly active desulfurizing agent is replenished from the top of tower 1, and high-efficiency active calcium powder required for the secondary desulfurization zone 5 is injected through the second feed inlet 9. This allows the flue gas in the cyclone chamber 7 to carry the high-efficiency active calcium powder into the secondary desulfurization zone 5. The secondary desulfurization zone 5 has a multi-layer rotating structure, and the secondary desulfurization process is completed as the flue gas gradually flows downwards from the top. This completes the multi-stage flue gas desulfurization process, and the SO2 concentration discharged from the desulfurization outlet 10 meets the requirements.

[0035] This embodiment features two independent material conveying and processing systems: a primary desulfurizer 15 and a secondary desulfurizer 16 (i.e., high-activity calcium powder). These two systems can be balanced in application. For example, when the activity of the granular material in the primary desulfurization zone 3 is good or the inlet SO2 concentration is low, the primary desulfurization zone 3 alone can treat the SO2 concentration to meet requirements. Therefore, the input of desulfurizer in the secondary desulfurization zone 5 can be minimized and dynamically adjusted. Conversely, when the activity of the desulfurizer in the primary desulfurization zone 3 decreases or the inlet SO2 concentration is high, the processing capacity of the secondary desulfurization zone 5 can be increased to ensure compliant emissions. Byproducts can be recycled, resulting in higher economic efficiency. For instance, after the secondary active calcium powder completes desulfurization, it is captured by the dust collector 11 and collected from the secondary byproduct outlet 13. Because the fixed-bed structure of the primary desulfurization zone 3 filters out a large number of impurity particles, the secondary byproducts are mainly composed of calcium sulfite and unreacted calcium hydroxide. The byproduct composition is relatively simple and can be reused as raw material for producing granular desulfurizer.

[0036] It is understandable that in practical applications, powder desulfurizer 16 can also use other materials such as baking soda and activated carbon powder to meet different working conditions. The specific choice can be made according to the actual working conditions, and no further restrictions are imposed here.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite dry desulfurization device, comprising: The tower body (1) is characterized in that the bottom of the tower body (1) is provided with a smoke inlet (2), a first desulfurization zone (3) is fixedly arranged in the tower body (1), and a second desulfurization zone (5) is fixedly arranged on the outer wall of the tower body (1); the second desulfurization zone (5) is arranged in a spiral along the axial direction of the tower body (1), the top end of the second desulfurization zone (5) is located above the first desulfurization zone (3), and the top end of the second desulfurization zone (5) is in communication with the first desulfurization zone (3).

2. The composite dry desulfurization device according to claim 1, characterized by The inside of the tower body (1) is fixedly provided with a clean smoke cyclone chamber (4), and the first desulfurization zone (3) is in communication with the second desulfurization zone (5) through the clean smoke cyclone chamber (4).

3. The composite dry desulfurization device according to claim 2, characterized by The clean smoke cyclone chamber (4) comprises a cyclone chamber (7), and a partitioning baffle (14) is fixedly arranged in the cyclone chamber (7); the partitioning baffle (14) is composed of a plurality of layers of strip-shaped inclined plates (17), spaces for accommodating particulate desulfurizers (15) are formed between the inclined plates (17) in the same layer, gaps allowing smoke to be discharged are formed between the inclined plates (17) of adjacent layers, the bottom of the partitioning baffle (14) is in communication with the first desulfurization zone (3), and the cyclone chamber (7) is in communication with the second desulfurization zone (5).

4. The composite dry desulfurization device according to claim 3, characterized by The smoke flow cross-sectional area of the cyclone chamber (7) gradually increases in the direction of smoke flow.

5. The composite dry desulfurization device according to claim 3, characterized by A first feeding port (8) is arranged at the top of the tower body (1), a second feeding port (9) is arranged at the connection position of the cyclone chamber (7) and the second desulfurization zone (5), the second feeding port (9) is provided with a plurality of second feeding ports (9), and the plurality of second feeding ports (9) completely cover the smoke flow cross section of the cyclone chamber (7).

6. The composite dry desulfurization device according to claim 2, characterized by A pressure stabilizing bin (6) is fixedly arranged in the tower body (1), the pressure stabilizing bin (6) is arranged above the clean smoke cyclone chamber (4), and the pressure stabilizing bin (6) is in communication with the clean smoke cyclone chamber (4).

7. The composite dry desulfurization device according to claim 1, characterized by The lowest end of the second desulfurization zone (5) is a desulfurization outlet (10), and the desulfurization outlet (10) is connected with a dust collector (11).

8. The composite dry desulfurization device according to claim 7, characterized by A first by-product outlet (12) is arranged at the bottom of the tower body (1), and the dust collector (11) is provided with a second by-product outlet (13).

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