A circulating fluidized bed desulfurization tower with a guide plate

Abstract

The utility model discloses a circulating fluidized bed desulfurization tower with guide plate, including oxidation jar, agitator, absorption jar, clean flue gas export and demisting jar, be provided with the adjusting assembly for adjusting the air intake of oxidation jar, the adjusting assembly includes the air inlet pipe, and the upper end fixedly connected with the breather pipe of air inlet pipe, one side of air inlet pipe is provided with the raw flue gas inlet, two venturi pipes are fixedly connected on raw flue gas inlet, and one side of two venturi pipes is fixedly connected with the throat pipe, make the dynamic regulation breather pipe overflow area through above -mentioned equipment, thereby automatic maintenance desulfurization tower in bed layer pressure drop stability, avoid because air intake fluctuation leads to bed layer instability, reduce the calcium sulfur ratio of desulfurization system, and realize flue gas uniform contact reaction, efficient desulfurization and gas -liquid separation, prevent local flow rate uneven influence reaction efficiency, avoid demister scale formation blockage through regular flushing simultaneously, improve the stability and desulfurization efficiency of desulfurization system.

Description

Technical Field

[0001] This utility model relates to the field of desulfurization technology, specifically a circulating fluidized bed desulfurization tower equipped with a guide plate. Background Technology

[0002] Coal is widely used as an important energy source in industrial production. However, coal combustion produces a large amount of sulfur-containing gases, such as sulfur dioxide. These gases, when released into the atmosphere, cause serious environmental pollution, leading to acid rain and other hazards, posing a significant threat to ecosystems and human health. Fluidized bed desulfurization towers, based on the fluidized bed principle, achieve efficient desulfurization by fluidizing the desulfurizing agent within the tower, allowing it to fully contact and react with the sulfur-containing waste gas. This technology offers advantages such as a large gas-solid contact area, high mass and heat transfer efficiency, and high operational flexibility, enabling it to adapt to desulfurization needs under various operating conditions.

[0003] In existing equipment, sulfur dioxide in the flue gas at the inlet reacts with quicklime and industrial water in the desulfurization tower in a gas-liquid-solid three-phase reaction environment. Most of the desulfurization reaction takes place inside the desulfurization tower. Semi-dry desulfurization relies on establishing a stable circulating fluidized bed for desulfurization. In the initial stage of desulfurization tower operation, the pressure drop control of the desulfurization tower bed is not stable enough, resulting in a large consumption of quicklime in the desulfurization tower and a thinner circulating fluidized bed. Therefore, a large amount of quicklime needs to be added for desulfurization and bed stabilization, increasing the calcium-sulfur ratio of the desulfurization system.

[0004] Therefore, this utility model provides a circulating fluidized bed desulfurization tower equipped with a guide plate to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a circulating fluidized bed desulfurization tower equipped with a guide plate, which solves the problem mentioned above where the pressure drop control of the desulfurization tower bed is not stable enough, resulting in a large consumption of quicklime in the desulfurization tower and a thinner circulating fluidized bed. This necessitates the addition of a large amount of slaked lime for desulfurization and bed stabilization, thereby increasing the calcium-sulfur ratio of the desulfurization system.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A circulating fluidized bed desulfurization tower equipped with a guide plate includes an oxidation tank, a stirrer, an absorption tank, a clean flue gas outlet, and a demister. The oxidation tank is equipped with an adjustment component for regulating the intake air volume. The adjustment component includes an intake pipe, and a vent pipe is fixedly connected to the upper end of the intake pipe. A raw flue gas inlet is provided on one side of the intake pipe. Two venturi tubes are fixedly connected to the raw flue gas inlet, and a throat is fixedly connected to one side of each of the two venturi tubes. A piston cylinder is fixedly connected to each of the two throats. A piston is movably connected inside the piston cylinder, and a movable rod is movably connected to the other end of the piston. The other end of the movable rod is fixedly connected to a sliding rod, and the other end of the sliding rod is fixedly connected to a movable plate. Four rotating rods are movably connected to the movable plate, and air plates are movably connected to each of the rotating rods. The air plates are located inside the ventilation pipe so that when the amount of raw flue gas entering changes, the gas flow rate inside the venturi tube will change, thereby attracting or pushing the piston inside the piston cylinder connected to the throat. At the same time, the movement of the piston drives the movable plate to move through the movable rod and sliding rod, thereby causing the rotating rod to move and drive the air plate to rotate, thereby adjusting the amount of raw flue gas passing through the ventilation pipe and avoiding the waste of quicklime and hydrated lime caused by unstable bed pressure drop due to increased gas intake.

[0007] Preferably, the absorption tank is internally connected to multiple spray racks, and each spray rack is fixedly connected to multiple spray nozzles for spraying. The two ends of the spray racks are connected to the oxidation pool inside the oxidation tank through a delivery pump and a pipeline, so that the mixed solution inside the oxidation tank can be sprayed out through the nozzles and fully contact the sulfur dioxide flue gas.

[0008] Preferably, the interior of the demister can is provided with an absorption mechanism for demisting. The absorption mechanism includes a support frame fixed inside the demister can. A first rinsing spray frame is provided at the bottom of the support frame. A spray frame is provided at the bottom of the first rinsing spray frame. A demister for demisting is provided below the spray frame. A second rinsing spray frame for rinsing is provided below the demister.

[0009] Preferably, the spray frame and the demister are fitted together, and the spray frame and the demister are located in the middle of the support frame and the second flushing spray frame, so as to reduce the temperature of the flue gas at the demister. The piston and the piston cylinder are tightly fitted together, and a sealing ring that matches the inner wall of the piston cylinder is fixedly connected to the outside of the piston.

[0010] Preferably, the bottom of the absorption tank is provided with a distribution component for uniform flue gas flow. The distribution component includes a ventilation plate, and multiple flue gas inflow pipes are fixedly connected to the ventilation plate. Each of the multiple flue gas inflow pipes is movably connected to a gas hood, and the side of the gas hood is provided with multiple air holes.

[0011] Preferably, the gas hood is fixedly connected to a limiting rod inside, and the gas pipe has movable grooves inside that match the two ends of the limiting rod, so that the gas hood is lifted upward when the gas passes through, thereby allowing the flue gas to flow out from the air hole. Beneficial effects

[0012] This invention provides a circulating fluidized bed desulfurization tower equipped with a guide plate. Compared with the prior art, it has the following advantages:

[0013] (1) The circulating fluidized bed desulfurization tower equipped with a guide plate, through the adjustment of the expansion and contraction structure of the Venturi tube and the throat tube, the linkage mechanism of the piston and the movable rod, the sliding rod, the movable plate and the rotating rod, when the original flue gas intake changes, the flow velocity in the Venturi tube changes, which causes the pressure difference at the throat tube to change, driving the piston to move and driving the gas plate to rotate in the ventilation pipe, dynamically adjusting the flow area of ​​the ventilation pipe, thereby automatically maintaining the stability of the bed pressure drop in the desulfurization tower, avoiding the instability of the bed due to the fluctuation of the intake volume, reducing the excessive consumption of quicklime and hydrate, and reducing the calcium-sulfur ratio of the desulfurization system.

[0014] (2) The circulating fluidized bed desulfurization tower equipped with a guide plate, through the flue gas uniform distribution mechanism composed of the air plate, air pipe, air hood and limit rod in the distribution component at the bottom of the absorption tank, the pressure of the flue gas pushes the air hood to move upward along the movable groove when the flue gas flows, so that the air holes open and the flue gas is evenly diffused to the cross section of the absorption tank. With the synergistic effect of the desulfurization solution sprayed by the spray frame nozzle and the spray frame, demister and flushing spray frame in the demister tank, the flue gas is uniformly contacted and reacted, the desulfurization is efficient and the gas-liquid separation is achieved, and the local flow velocity is not uniform, which affects the reaction efficiency. At the same time, the demister is prevented from being scaled and blocked by regular flushing, thereby improving the stability and desulfurization efficiency of the desulfurization system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a three-dimensional view of the overall structure of this utility model.

[0017] Figure 3 This is a three-dimensional view of the internal structure of the absorption tank of this utility model;

[0018] Figure 4 This is a three-dimensional view of the absorption mechanism structure of this utility model;

[0019] Figure 5 This is a cross-sectional view of the distribution component structure of this utility model;

[0020] Figure 6 This is a three-dimensional view of the adjustment component structure of this utility model.

[0021] In the picture:

[0022] 1. Oxidation tank; 2. Agitator; 3. Absorption tank; 4. Clean flue gas outlet; 5. Demisting tank;

[0023] 6. Adjustment assembly; 61. Inlet pipe; 62. Raw flue gas inlet; 63. Venturi tube; 64. Throat pipe; 65. Piston cylinder; 66. Piston; 67. Movable rod; 68. Slide rod; 69. Movable plate; 610. Rotating rod; 611. Air plate; 612. Vent pipe;

[0024] 7. Absorption mechanism; 71. Support frame; 72. Flushing spray frame one; 73. Spray frame; 74. Demister; 75. Flushing spray frame two;

[0025] 8. Distribution components; 81. Ventilation plate; 82. Air pipe; 83. Movable slot; 84. Air hood; 85. Air hole; 86. Limiting rod;

[0026] 9. Sprayer frame; 10. Sprayer head. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0028] Please see Figures 1 to 6A circulating fluidized bed desulfurization tower with a guide plate includes an oxidation tank 1, an agitator 2, an absorption tank 3, a clean flue gas outlet 4, and a demister 5. The oxidation tank 1 is equipped with an adjustment component 6 for regulating the intake air volume. The adjustment component 6 includes an intake pipe 61, with a vent pipe 612 fixedly connected to the upper end of the intake pipe 61. A raw flue gas inlet 62 is provided on one side of the intake pipe 61. Two venturi tubes 63 are fixedly connected to the raw flue gas inlet 62, and a throat 64 is fixedly connected to one side of each of the two venturi tubes 63. A piston cylinder 65 is fixedly connected to each of the two throats 64. A piston 66 is movably connected inside the piston cylinder 65, and a movable rod 67 is movably connected to the other end of the piston 66. A sliding rod 68 is fixedly connected to the other end of the movable rod 67, and a movable plate 69 is fixedly connected to the other end of the sliding rod 68. Four rotating rods 610 are movably connected, and air plates 611 are movably connected to each of the rotating rods 610. The air plates 611 are located inside the ventilation pipe 612 so that when the amount of raw flue gas entering changes, the gas flow rate inside the venturi tube 63 will change, thereby attracting or pushing the piston 66 inside the piston cylinder 65 connected to the throat pipe 64. At the same time, the movement of the piston 66 drives the movement of the movable plate 69 through the movable rod 67 and the sliding rod 68, thereby causing the rotating rod 610 to move and drive the air plate 611 to rotate, thereby adjusting the amount of raw flue gas passing through the ventilation pipe 612. This avoids the waste of quicklime and hydrated lime caused by unstable bed pressure drop due to the increase in gas entering. The piston 66 and the piston cylinder 65 are tightly fitted together, and a sealing ring that matches the inner wall of the piston cylinder 65 is fixedly connected to the outside of the piston 66.

[0029] During operation, the raw flue gas enters through the raw flue gas inlet 62. As it passes through the venturi tube 63 and throat 64, the expansion and contraction structure of the venturi tube 63 alters the gas flow velocity, creating a pressure difference. When the raw flue gas intake increases, the flow velocity within the venturi tube 63 accelerates, and the negative pressure at the throat 64 intensifies, attracting the piston 66 within the piston cylinder 65 to move towards the throat 64. Conversely, when the intake volume decreases, the flow velocity decreases, and the pressure difference pushes the piston 66 away from the throat 64. The piston 66, via the movable rod 67, drives the sliding rod 68 to move laterally (wherein, a movable limiting connection exists between the piston 66 and the movable rod 67 to compensate for the vertical displacement of the movable plate 69 during movement). The sliding rod 68 pushes the movable plate 69 in the ventilation pipe 6... The movable plate 69 moves inward and drives the air plate 611 to rotate around the axis of the rotating rod 610 via the rotating rod 610. The rotation angle of the air plate 611 changes the flow area of ​​the vent pipe 612. When the air intake is too large, the air plate 611 rotates to reduce the opening of the vent pipe 612 and limit the air intake. When the air intake is too small, the air plate 611 rotates to increase the opening and maintain stable air intake, thereby stabilizing the pressure drop of the desulfurization fluidized bed above and avoiding incomplete reaction caused by pressure drop imbalance. The sealing ring between the piston 66 and the piston cylinder 65 ensures airtightness and avoids gas leakage from affecting the adjustment accuracy. Finally, through the dynamic adjustment of the air plate 611, the pressure drop of the bed in the desulfurization tower is maintained to reduce the waste of quicklime and hydrated lime. Example

[0030] Please see Figures 1 to 6This embodiment provides a technical solution based on Embodiment 1: Multiple spray racks 9 are fixedly connected inside the absorption tank 3, and multiple spray nozzles 10 for spraying are fixedly connected to each spray rack 9. Both ends of the spray racks 9 are connected to the oxidation tank inside the oxidation tank 1 via a delivery pump and pipeline, so that the mixed solution inside the oxidation tank 1 can be sprayed out through the nozzles 10 and fully contact the sulfur dioxide flue gas. An absorption mechanism 7 for demisting is provided inside the demister 5. The absorption mechanism 7 includes a support frame 71 fixed inside the demister 5. A rinsing spray rack 72 is provided at the bottom of the support frame 71, a spray rack 73 is provided at the bottom of the rinsing spray rack 72, and a demister 74 for demisting is provided below the spray rack 73. A flushing spray rack 73 is provided below the demister 74. The second flushing spray frame 75, the spray frame 73 and the demister 74 are fitted together, and the spray frame 73 and the demister 74 are located in the middle of the support frame 71 and the second flushing spray frame 75 to reduce the temperature of the flue gas at the demister 74. The bottom of the absorption tank 3 is provided with a distribution component 8 for uniform flue gas flow. The distribution component 8 includes a ventilation plate 81, and multiple flue gas inflow pipes 82 are fixedly connected to the ventilation plate 81. Each of the multiple pipes 82 is movably connected to a hood 84. Multiple air holes 85 are opened on the side of the hood 84. A limiting rod 86 is fixedly connected inside the hood 84, and the inside of the pipe 82 is provided with a movable groove 83 that matches the two ends of the limiting rod 86, so that when the gas passes through, it pushes the hood 84 upward, so that the flue gas can flow out from the air holes 85.

[0031] During operation, after the flue gas enters the absorption tank 3 through the regulating component 6, it first flows through the distribution component 8 at the bottom. As the flue gas flows upward from the air pipe 82 of the ventilation plate 81, the gas pressure pushes the air hood 84 upward along the limiting rod 86 within the movable groove 83 of the air pipe 82. The air holes 85 on the side of the air hood 84 open, allowing the flue gas to diffuse evenly to the cross-section of the absorption tank 3. At this time, the fluidized bed is located between the distribution component 8 and the spray frame 9. The evenly distributed flue gas continues to rise and comes into contact with the mixed solution sprayed from the spray frame 9. The solution in the internal oxidation tank is transported to the spray frame 9 via a pump and pipeline. After being sprayed from the nozzle 10, it reacts with sulfur dioxide in the flue gas to undergo desulfurization. The flue gas after the reaction enters the demister 5 upward. The spray frame 73 of the absorption mechanism 7 first sprays liquid to reduce the temperature of the flue gas and cause the droplets to coalesce. The demister 74 captures the coalesced droplets through a baffle structure to achieve gas-liquid separation. The first flushing spray frame 72 and the second flushing spray frame 75 periodically flush the demister 74 to prevent scaling and blockage. Finally, the purified flue gas is discharged from the clean flue gas outlet 4.

[0032] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0033] Working principle: During operation, the raw flue gas first enters the regulating component 6 through the raw flue gas inlet 62. When passing through the venturi tube 63 and the throat tube 64, the pressure difference is formed due to the change in flow velocity. The piston 66 drives the movable plate 69 and the rotating rod 610 through the movable rod 67 and the sliding rod 68, so that the air plate 611 rotates in the ventilation pipe 612, and the air intake is adjusted to stabilize the bed pressure drop. The regulated flue gas enters the absorption tank 3. It first pushes the air hood 84 upward through the ventilation plate 81 and the air pipe 82 of the distribution component 8, and diffuses evenly from the air hole 85. At this time, the fluidized bed is located between the distribution component 8 and the spray frame 9. The flue gas rises and reacts with the solution in the oxidation tank 1 sprayed by the nozzle 10 of the spray frame 9. Then it enters the demister 5. After being cooled by the spray frame 73 of the absorption mechanism 7 and demisted by the demister 74, and washed by the first and second spray frames 72 and 75, the clean flue gas is discharged from the clean flue gas outlet 4.

[0034] It should be noted that all standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circulating fluidized bed desulfurization tower equipped with a guide plate, comprising an oxidation tank (1), a stirrer (2), an absorption tank (3), a clean flue gas outlet (4), and a demister (5), characterized in that: The oxidation tank (1) is provided with an adjustment component (6) for adjusting the intake air volume. The adjustment component (6) includes an intake pipe (61), and a vent pipe (612) is fixedly connected to the upper end of the intake pipe (61). A raw flue gas inlet (62) is provided on one side of the intake pipe (61). Two venturi tubes (63) are fixedly connected to the raw flue gas inlet (62), and a throat pipe (64) is fixedly connected to one side of each of the two venturi tubes (63). A piston cylinder (65) is fixedly connected to each of the two throat pipes (64). The piston cylinder (65) is movably connected to a piston (66), and the other end of the piston (66) is movably connected to a movable rod (67). The other end of the movable rod (67) is fixedly connected to a slide rod (68), and the other end of the slide rod (68) is fixedly connected to a movable plate (69). Four rotating rods (610) are movably connected to the movable plate (69), and air plates (611) are movably connected to each of the rotating rods (610). The air plates (611) are located inside the vent pipe (612).

2. A circulating fluidized bed desulfurization tower with a guide plate according to claim 1, characterized in that: The absorption tank (3) is fixedly connected to a plurality of spray racks (9), and each spray rack (9) is fixedly connected to a plurality of spray nozzles (10) for spraying. The two ends of the spray racks (9) are connected to the oxidation pool inside the oxidation tank (1) through a delivery pump and a pipeline.

3. A circulating fluidized bed desulfurization tower with a guide plate according to claim 1, characterized in that: The interior of the demister (5) is provided with an absorption mechanism (7) for demisting. The absorption mechanism (7) includes a support frame (71) fixed inside the demister (5). A first flushing spray frame (72) is provided at the bottom of the support frame (71). A spray frame (73) is provided at the bottom of the first flushing spray frame (72). A demister (74) for demisting is provided below the spray frame (73). A second flushing spray frame (75) for rinsing is provided below the demister (74).

4. A circulating fluidized bed desulfurization tower with a guide plate according to claim 3, characterized in that: The spray frame (73) and the demister (74) are fitted together, and the spray frame (73) and the demister (74) are located in the middle of the support frame (71) and the second flushing spray frame (75). The piston (66) and the piston cylinder (65) are tightly fitted together, and a sealing ring that matches the inner wall of the piston cylinder (65) is fixedly connected to the outside of the piston (66).

5. A circulating fluidized bed desulfurization tower with a guide plate according to claim 1, characterized in that: The bottom of the absorption tank (3) is provided with a distribution component (8) for uniform flue gas flow. The distribution component (8) includes a ventilation plate (81), and multiple flue gas inflow pipes (82) are fixedly connected to the ventilation plate (81). Each of the multiple pipes (82) is movably connected to an air hood (84), and multiple air holes (85) are opened on the side of the air hood (84).

6. A circulating fluidized bed desulfurization tower with a guide plate according to claim 5, characterized in that: The air hood (84) is fixedly connected to a limiting rod (86), and the air pipe (82) has a movable groove (83) inside that matches the two ends of the limiting rod (86).

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