Sleeve type SDS (sodium dodecyl sulfate) desulfurizing tower

Abstract

The invention discloses a sleeve type SDS desulfurizing tower which comprises a tower body and a smoke exhaust pipe used for conveying smoke, the smoke exhaust pipe comprises a smoke inlet section, an acceleration section, a deceleration section and a smoke outlet section which are sequentially communicated, the acceleration section, the deceleration section and the smoke outlet section are located in an inner cavity of the tower body, and a smoke outlet of the smoke outlet section faces the top of the inner cavity of the tower body; a desulfurizing agent powder spraying assembly is arranged beside the tower body and comprises a spraying head extending into the tower body and the smoke inlet section. After primary mixing and reaction of smoke are completed in the smoke exhaust pipe, the smoke is exhausted from the smoke outlet in the top and slowly settles in the cavity of the whole tower body from top to bottom, so that a dual reaction environment of a pipeline reaction area and a tower body reaction area is formed, the external space required by the desulfurization system is shortened, the problem of the SDS technology in space limited occasions is solved, and the desulfurization efficiency is improved. And the total flue gas retention time is 1-2 seconds longer than that of the traditional flue gas retention time, so that the desulfurization reaction is ensured to be fully carried out.

Description

Technical Field

[0001] This invention relates to the field of desulfurization towers, and in particular to a sleeve-type SDS desulfurization tower. Background Technology

[0002] SDS dry desulfurization injection technology is a widely used dry desulfurization process for flue gas treatment. Its core principle is to uniformly inject a highly efficient desulfurizing agent (such as sodium bicarbonate) with a particle size of 20-25μm into the flue gas duct. As the desulfurizing agent flows with the flue gas, it is thermally activated, rapidly increasing its specific surface area. This allows it to undergo efficient physical and chemical reactions with acidic substances such as SO2 in the flue gas, achieving purification. The byproducts of the reaction, along with dust in the flue gas, are collected in a subsequent settling chamber or baghouse dust collector.

[0003] However, this technology faces a significant bottleneck in practical engineering applications: to ensure desulfurization efficiency, the desulfurizing agent needs 1-2 seconds of sufficient contact and reaction time with the SO2 in the flue gas. This reaction time requirement directly determines the minimum length of the required flue. In practice, to meet this requirement, the flue after the injection point often needs to be more than 15 meters long. This rigid requirement for linear space leads to a large footprint and poor layout flexibility for the entire desulfurization system, especially in space-constrained retrofit projects, significantly increasing implementation difficulty and cost.

[0004] Currently, a common solution is to directly inject the desulfurizing agent into the settling chamber or the horizontal flue before the bag filter. However, this simple flue gas injection mixing mode's mixing efficiency depends on the degree of flue gas turbulence, which is often less than ideal. To compensate for uneven mixing and insufficient reaction time, the design still requires a long flue, further exacerbating the space constraints. In addition, after long-term operation, the flue is prone to the deposition of desulfurizing agent and dust, posing a risk of blockage. Summary of the Invention

[0005] In view of this, the present invention addresses the deficiencies of the prior art, and its main objective is to provide a sleeve-type SDS desulfurization tower that solves the aforementioned problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a sleeve-type SDS desulfurization tower, comprising a tower body and a flue gas exhaust pipe for conveying flue gas, the flue gas exhaust pipe comprising a flue gas inlet section, an acceleration section, a deceleration section and a flue gas outlet section connected in sequence, the acceleration section, the deceleration section and the flue gas outlet section being located in the inner cavity of the tower body, and the flue gas outlet of the flue gas outlet section facing the top of the inner cavity of the tower body. A desulfurizing agent powder spraying assembly is installed next to the tower body, which includes spray heads that extend into the tower body and the flue gas inlet section; During operation, the spray head sprays desulfurizing agent into the tower body and the flue gas pipe, where it mixes thoroughly with the flue gas.

[0007] Furthermore, the acceleration section, deceleration section, and smoke exit section are Venturi pipe sections.

[0008] Furthermore, a bend is provided at the intersection of the acceleration section and the deceleration section, and the bend is connected to a guide pipe; one end of the guide pipe extends to the bottom of the tower body, and the other end is connected to the gas outlet of the smoke outlet section.

[0009] Furthermore, the guide pipe is a three-way pipe, which includes an ash inlet section, an ash outlet section, and a smoke exhaust section. The inlet of the ash inlet section is located at the position where particulate matter in the flue gas impacts the bending section and is connected to the bending section. A through-hole plate is provided at the connection between the bending section and the ash inlet section.

[0010] Furthermore, both the ash discharge section and the smoke discharge section are equipped with interconnected expansion sections.

[0011] Furthermore, a rod is installed inside the ash outlet of the ash discharge section, and a rotatable receiving plate is sleeved on the rod. The receiving plate is connected to an elastic element so that the receiving plate is in an inclined position under normal conditions.

[0012] Furthermore, a plate is provided on one side of the ash outlet cavity of the ash discharge section. The plate overlaps with the receiving plate. An elastic element is provided on the plate and acts on the receiving plate. The plate has an inclined surface that matches the receiving plate.

[0013] Furthermore, an ash hopper is provided at the bottom of the tower's internal cavity, with an ash discharge port at the bottom of the ash hopper and an inspection port on one side.

[0014] Furthermore, an air outlet is provided on one side of the lower part of the tower's internal cavity, and the air outlet is positioned opposite to the smoke inlet section.

[0015] Furthermore, the upper part of the tower's internal cavity is equipped with multiple support structures, and the Venturi tube section is installed on the support structures.

[0016] Compared with existing technologies, this invention has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, after the flue gas completes primary mixing and reaction in the flue pipe, it is discharged from the top flue outlet and then slowly settles from top to bottom in the entire tower cavity, forming a dual reaction environment of "pipeline reaction zone" + "tower reaction zone". This shortens the external space required for the desulfurization system, solves the problem of SDS technology in space-constrained situations, and the total flue gas residence time exceeds the traditional 1-2 seconds, ensuring the full progress of the desulfurization reaction.

[0017] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a front view of the tower body according to Embodiment 1 of the present invention.

[0019] Figure 2 This is a view of the back of the tower body according to Embodiment 1 of the present invention.

[0020] Figure 3 This is Embodiment 1 of the present invention. Figure 1 Enlarged view of point A.

[0021] Figure 4 This is a cross-sectional view of the ash discharge section of Embodiment 1 of the present invention.

[0022] Explanation of reference numerals in the attached diagram: Tower body 10; 20. Smoke exhaust pipe, 21. Smoke inlet section, 22. Acceleration section, 23. Deceleration section, 24. Smoke outlet section, 25. Bending section, 26. Guide pipe, 261. Ash inlet section, 262. Ash outlet section, 262. Rod body, 2621. Support plate, 2622. Elastic element, 2623. Plate body, 2624. Smoke exhaust section, 263. Through hole plate, 264. Expanded diameter section, 265. Desulfurizing agent powder spraying assembly 30, spray head 31; Ash hopper 40, ash discharge port 41, inspection port 42; Air outlet 50; Support structure 60. Detailed Implementation

[0023] Please refer to Figure 1 As shown, it illustrates the specific structure of a preferred first embodiment of the present invention, which is a sleeve-type SDS desulfurization tower, including a tower body 10 and a flue gas exhaust pipe 20 for conveying flue gas. The flue gas exhaust pipe 20 includes a flue gas inlet section 21, an acceleration section 22, a deceleration section 23 and a flue gas outlet section 24 connected in sequence. The acceleration section 22, the deceleration section 23 and the flue gas outlet section 24 are located in the inner cavity of the tower body 10, and the flue gas outlet of the flue gas outlet section 24 faces the top of the inner cavity of the tower body 10. A desulfurizing agent powder spraying assembly 30 is provided next to the tower body 10. The desulfurizing agent powder spraying assembly 30 includes a spray head 31 extending into the tower body 10 and the flue gas inlet section 21. During operation, the spray head 31 sprays desulfurizing agent into the tower body 10 and the exhaust pipe 20, where it mixes thoroughly with the flue gas. After the flue gas completes primary mixing and reaction in the exhaust pipe, it is discharged from the top outlet and then slowly settles from top to bottom within the entire tower cavity, forming a dual reaction environment of "pipeline reaction zone" + "tower body reaction zone". This shortens the external space required for the desulfurization system, solves the problem of SDS technology in space-constrained situations, and the total flue gas residence time exceeds the traditional 1-2 seconds, ensuring the full progress of the desulfurization reaction.

[0024] Specifically, inside the flue gas pipe 20, in the acceleration section 22, i.e. the throat of the venturi tube, the flue gas is accelerated to high speed, forming strong turbulence. At this time, the desulfurizing agent injected into the flue gas inlet section 21 is entrained and dispersed, achieving the first full mixing with the flue gas. The gas-solid two-phase flow sprayed from the outlet of the flue gas outlet section 24 suddenly decelerates and diffuses in the space at the top of the tower, and meets and mixes again with the desulfurizing agent directly injected into the tower by the spray head 31, forming secondary desulfurization to improve the desulfurization effect.

[0025] In addition, the flue gas is discharged from the top of the inner cavity of the tower body 10. Its kinetic energy is effectively buffered by the tower body space, and the flow rate is reduced sharply. The solid particles (reaction by-products, unreacted desulfurizing agents, and raw dust) carried by the flue gas are more likely to settle due to their own gravity in the low-speed environment, which reduces the load on the subsequent bag filter, reduces the overall resistance of the system, and reduces the energy consumption of ash discharge at the bottom of the tower.

[0026] like Figure 1 As shown, for example, the acceleration section 22, deceleration section 23, and flue gas outlet section 24 are Venturi tube sections. When the flue gas flows through the acceleration section 22 of the Venturi tube, the flow cross-section decreases sharply, and the flue gas velocity increases to a high point. According to Bernoulli's principle, the static pressure energy here is converted into kinetic energy, forming extremely strong shear force and turbulent field. After the injected desulfurizing agent powder is entrained in this area, it will be instantly "torn apart" and "dispersed" by the high-speed airflow. The mixing caused by turbulence is more efficient than mixing relying on natural diffusion or in ordinary straight pipes, ensuring that the desulfurizing agent is in full contact with the flue gas, improving the activation efficiency and initial reaction rate of the desulfurizing agent.

[0027] It should be noted that the high-speed, low-pressure environment at the throat of the Venturi tube creates a pressure difference with the relatively high pressure at the front end of the flue gas inlet section 21. This pressure difference generates a "suction" effect, which helps the desulfurizing agent powder enter the flue more smoothly, prevents nozzle blockage, and ensures that the powder is deeply entrained into the center of the flue gas flow, rather than just adhering to the vicinity of the tube wall. After the gas-solid two-phase flow undergoes vigorous mixing in the throat, it enters the deceleration section 23. In this stage, the flow velocity gradually decreases, and the static pressure is restored. This deceleration process forms a reaction buffer zone, providing a reaction environment and time for the fully activated and mixed desulfurizing agent and SO2 in the flue gas, allowing the chemical reaction to proceed continuously and fully.

[0028] like Figure 1As shown, for example, a bend 25 is provided at the intersection of the acceleration section 22 and the deceleration section 23, and the bend 25 is connected to a guide pipe 26; one end of the guide pipe 26 extends to the bottom of the tower body 10, and the other end is connected to the gas outlet end of the flue gas outlet section 24. The flue gas accelerated by the venturi throat, the larger and heavier dust particles and unreacted desulfurizing agent carried therein, due to their greater inertia, cannot be quickly turned with the airflow when flowing through the bend 25, and will directly collide with and deposit on the wall of the bend, that is, enter the guide pipe 26, so as to reduce the dust load in the subsequent tower body, so that the space inside the tower can focus more on completing the efficient desulfurization reaction, rather than simply dust settling.

[0029] like Figure 1 As shown, exemplarily, the guide pipe 26 is a three-way pipe, which includes an ash inlet section 261, an ash outlet section 262, and a smoke outlet section 263. The inlet of the ash inlet section 261 is located at the position where particulate matter in the flue gas impacts the bending section 25, and is connected to the bending section 25. A perforated plate 264 is provided at the connection between the bending section 25 and the ash inlet section 261. Due to their large mass and inertia, solid particles cannot follow the airflow and change direction sharply. They directly impact and pass through the holes of the perforated plate 264 and enter the ash inlet section 261. At the same time, due to the small inertia of the gas and the local resistance provided by the perforated plate 264, most of the main airflow will be blocked by the perforated plate 264 and its flow direction will be changed. It will flow along the main path to the deceleration section 23 and the smoke outlet section 24 of the Venturi tube, thereby collecting the dust after the reaction to a certain extent.

[0030] like Figure 2 As shown, for example, both the ash discharge section 262 and the smoke discharge section 263 are provided with interconnected expansion sections 265. The airflow and particulate matter in the airflow entering the ash discharge section 262 and the smoke discharge section 263 from the ash section 261 will have a significantly reduced flow velocity in the expansion section 265 due to the sudden increase in the flow cross-section. At this time, the coarser and heavier particles will naturally settle in the low-velocity area due to gravity and slide along the inclined pipe wall to the ash hopper at the bottom of the tower, while the airflow will be discharged in the smoke discharge section 263 due to the natural temperature rise of the flue gas.

[0031] like Figure 4 As shown, for example, a rod 2621 is provided inside the ash outlet of the ash discharge section 262. A rotatable receiving plate 2622 is sleeved on the rod 2621. The receiving plate 2622 is connected to an elastic element 2623, so that the receiving plate 2622 is in an inclined position in the normal state. Under the action of the elastic element 2623, the receiving plate 2622 maintains an inclined position in the normal state, which is equivalent to closing the outlet of the ash discharge section 262 and forming a physical seal for the ash discharge section 262. When the pressure at the bottom of the tower is temporarily higher than the pressure inside the guide pipe 26, this structure can effectively prevent the flue gas, moisture or settled dust at the bottom of the tower from flowing back into the ash discharge section 262.

[0032] It should be noted that when the dust collected by the bending section 25 accumulates to a certain weight in the ash discharge section 262, and the torque formed by its gravity overcomes the torque of the elastic element 2623, the receiving plate 2622 will be pressed down and rotated, opening the channel and allowing the accumulated ash to be discharged into the bottom of the inner cavity of the tower body 10. After the ash is discharged, the gravity decreases, and the elastic element 2623 drives the receiving plate 2622 to automatically reset to the inclined sealing state.

[0033] like Figure 4 As shown, exemplarily, a plate 2624 is provided on one side of the inner cavity of the ash discharge port of the ash discharge section 262. The plate 2624 overlaps with the receiving plate 2622. An elastic element 2623 is provided on the plate 2624 and acts on the receiving plate 2622. The plate 2624 has an inclined surface that matches the receiving plate 2622. The inclined surface on the plate 2624 that matches the receiving plate 2622 causes the dust particles that fall onto the plate 2624 and accumulate on the receiving plate 2622 to agglomerate to a sufficiently large volume. The component of their own weight in the inclined direction will overcome the friction and adhesion, causing them to slide off automatically. In addition, the overlap between the plate 2624 and the receiving plate 2622 also provides a sealing effect.

[0034] like Figure 1 As shown, for example, the bottom of the inner cavity of the tower body 10 is provided with an ash hopper 40, the bottom end of the ash hopper 40 is provided with an ash discharge port 41, and one side is provided with an inspection port 42. The conical or V-shaped structure of the ash hopper 40 provides a collection container for all solid materials settling in the tower (including desulfurization reaction byproducts, incompletely reacted desulfurizing agents, and raw dust in the flue gas). The ash discharge port is the final outlet of the ash hopper, on which an ash discharge valve can be installed to discharge the collected ash from the system as needed and intermittently, and send it to the ash silo or transport equipment. The inspection port 42 is used to provide operators with a passage to the inside of the equipment when the system is malfunctioning, such as when bridging or blockage is suspected in the ash hopper 41, or when it is necessary to check the corrosion of the inner wall.

[0035] An air outlet 50 is provided on one side of the lower part of the inner cavity of the tower body 10, and the air outlet 50 is positioned opposite to the smoke inlet section 21.

[0036] Multiple support structures 60 are provided in the upper part of the inner cavity of the tower body 10, and the Venturi pipe section is installed on the support structure 60.

[0037] In summary, the key design focus of this invention is; 1.1 Flue gas enters the exhaust pipe 20 through the flue gas inlet section 21. At the same time, the desulfurizing agent powder spraying assembly 30 is activated, and the desulfurizing agent powder is sprayed into the flue gas inlet section 21 and the inner cavity of the tower body 10 through the spray head 31; 1.2 When the flue gas flows through the acceleration section 22 of the venturi tube, the flow velocity increases sharply, forming high-speed turbulence. The low-pressure environment here generates a suction effect, which assists and enhances the entrainment and dispersion of the desulfurizing agent powder injected from the flue gas inlet section 21, achieving the first thorough mixing of the gas and solid phases; 1.3 The mixed gas-solid two-phase flow enters the deceleration section 23, where the flow velocity decreases and the static pressure recovers, providing an initial reaction environment and time for the chemical reaction between the desulfurizing agent and SO2; 1.4 The high-speed airflow carrying particulate matter turns sharply at the bend 25. Larger particles (such as unreacted desulfurizing agent, reaction byproducts, and raw dust) cannot turn with the airflow due to inertia, and instead collide with and pass through the through-hole plate 264, entering the ash inlet section 261 of the guide pipe 26; 1.5 When the accumulated weight of the particles entering the ash discharge section 262 is sufficient to overcome the torque of the elastic element 2623, it will press down the receiving plate 2622, causing the particles to be discharged into the bottom of the tower body 10. After discharge, the receiving plate 2622 automatically returns to its tilted sealing state under the action of the elastic element 2623 to prevent backflow of gas at the bottom of the tower. A small amount of airflow that enters the guide pipe 26 with the particles has a reduced velocity in the expansion section 265 of the ash discharge section 262 and the smoke exhaust section 263. Finer particles may be carried back to the smoke outlet section 24 from the smoke exhaust section 263 by the rising airflow, while coarser particles settle and slide to the bottom of the tower.

[0038] 2.1 The flue gas after primary mixing and pre-separation is sprayed at high speed from the outlet of the flue gas section 24 to the top of the inner cavity of the tower body 10, where it meets and mixes again with the desulfurizing agent directly injected into the tower to form secondary desulfurization; 2.2 The flue gas velocity decreases sharply within the vast tower space, and it slowly settles from top to bottom. This greatly prolongs the total contact time between the flue gas and the desulfurizing agent, ensuring the full progress of the desulfurization reaction; 2.3 Under low-speed conditions within the tower body 10, the solid particles carried by the flue gas settle due to their own gravity. All settled solid particles (including those falling from the guide pipe 26 and those settling within the tower) eventually collect in the ash hopper 40 at the bottom of the tower and are periodically discharged from the system through the ash discharge port 41. The inspection port 42 is used for maintenance and unclogging. 2.4 The purified flue gas after the desulfurization reaction and particle settling flows to the outlet 50 at the bottom of the tower 10 and is finally discharged from the desulfurization tower and enters the subsequent dust removal system.

[0039] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A skid-mounted SDS desulfurization tower, characterized in that: The application relates to a flue gas tower, which comprises a tower body (10) and a flue gas discharging pipe (20) for conveying flue gas, wherein the flue gas discharging pipe (20) comprises a flue gas inlet section (21), an acceleration section (22), a deceleration section (23) and a flue gas outlet section (24) which are sequentially communicated, the acceleration section (22), the deceleration section (23) and the flue gas outlet section (24) are located in the inner cavity of the tower body (10), and the flue gas outlet of the flue gas outlet section (24) faces the top of the inner cavity of the tower body (10). A desulfurizer powder spraying assembly (30) is arranged beside the tower body (10), and the desulfurizer powder spraying assembly (30) comprises a spraying head (31) which extends into the tower body (10) and the flue gas inlet section (21). During operation, the spraying head (31) sprays desulfurizer into the tower body (10) and the flue gas discharging pipe (20) to fully mix with the flue gas.

2. A sleeve-type SDS desulphurization tower as claimed in claim 1, wherein: The acceleration section (22), the deceleration section (23) and the flue gas outlet section (24) are Venturi pipe sections.

3. A sleeve-type SDS desulphurization tower as claimed in claim 2, wherein: A bending part (25) is arranged at the intersection of the acceleration section (22) and the deceleration section (23), and a flow guide pipe (26) is communicated with the bending part (25); one end of the flow guide pipe (26) extends to the bottom of the tower body (10), and the other end is communicated with the gas outlet end of the flue gas outlet section (24).

4. A sleeve-type SDS desulphurization tower as claimed in claim 3, wherein: The flow guide pipe (26) is a three-way pipe, which comprises an ash inlet section (261), an ash discharging section (262) and a flue gas discharging section (263), the inlet of the ash inlet section (261) is arranged at the position where the particulate matters in the flue gas hit the bending part (25) and is communicated with the bending part (25), and a perforated plate (264) is arranged at the communication position of the bending part (25) and the ash inlet section (261).

5. A sleeve-type SDS desulphurization tower as claimed in claim 4, wherein: The ash discharging section (262) and the flue gas discharging section (263) are both provided with a diameter expanding section (265) which is communicated with them.

6. A sleeve-type SDS desulphurization tower as claimed in claim 5, wherein: A rod body (2621) is arranged in the ash outlet of the ash discharging section (262), a rotatable receiving plate (2622) is sleeved on the rod body (2621), an elastic member (2623) is connected with the receiving plate (2622) to make the receiving plate (2622) in an inclined state in a normal state.

7. A sleeve-type SDS desulphurization tower as claimed in claim 6, wherein: A plate body (2624) is arranged on one side of the inner cavity of the ash outlet of the ash discharging section (262), the plate body (2624) is overlapped with the receiving plate (2622), the elastic member (2623) is arranged on the plate body (2624) and acts on the receiving plate (2622), and the plate body (2624) has an inclined surface which is matched with the receiving plate (2622).

8. A sleeve type SDS desulphurization tower as claimed in claim 2, wherein: A hopper (40) is arranged at the bottom of the inner cavity of the tower body (10), a dust falling port (41) is arranged at the bottom end of the hopper (40), and a maintenance port (42) is arranged on one side of the hopper (40).

9. A sleeve type SDS desulphurization tower as claimed in claim 2, wherein: An air outlet (50) is arranged on one side of the lower part of the inner cavity of the tower body (10), and the air outlet (50) is arranged opposite to the flue gas inlet section (21).

10. A sleeve type SDS desulphurization tower as claimed in claim 2, wherein: A plurality of support structures (60) are arranged in the middle and upper parts of the inner cavity of the tower body (10), and the Venturi pipe sections are installed on the support structures (60).

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