Circulating fluidized bed boiler desulfurization device
By optimizing the structure of the circulating fluidized bed boiler desulfurization tower, including the dual tangential flue gas inlet and multi-layer spray layer design, the problem of insufficient desulfurization efficiency in the prior art is solved, and more efficient flue gas desulfurization and fog removal are achieved. Effect.
Patent Information
- Application Number
- CN202420988546.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The limestone-gypsum wet desulfurization device outside the circulating fluidized bed boiler furnace is difficult to further improve the desulfurization efficiency without increasing the cost.
By optimizing the structure of the desulfurization tower, including the design of double-tangential flue gas inlets, spray layers and defogging devices, multi-layer spray layers, spiral blades and diversion pipes, the flue gas residence time is extended and the gas-liquid contact is improved. Efficiency and separation effect.
The desulfurization efficiency is improved, the diffusion power of flue gas in the tower is reduced, the flue gas residence time is extended, the gas-liquid separation effect is enhanced, the piezoresistance is reduced, and the stability and defogging effect of the desulfurization tower are improved.
Smart Images
Figure CN222239617U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of desulfurization equipment, in particular to a circulating fluidized bed boiler desulfurization device. Background Art
[0002] Circulating fluidized bed boilers have the characteristics of wide fuel adaptability and low pollutant removal cost. They are more suitable for the combustion of high-ash and high-sulfur coal. When the desulfurization efficiency of some circulating fluidized bed boilers is not enough to stably achieve ultra-low SO2 emissions, the flue gas needs to be further purified at the boiler outlet. At present, the commonly used desulfurization methods for circulating fluidized bed units are semi-dry flue gas desulfurization in the furnace and wet desulfurization of limestone-gypsum outside the furnace. Among them, wet desulfurization of limestone-gypsum outside the furnace is more widely used. The desulfurization process uses limestone as a desulfurization absorbent. The limestone is crushed and ground into powder and mixed with water to form a slurry, which is poured into the absorption tower. The absorption slurry contacts and mixes with the flue gas. The SO2 in the flue gas reacts chemically with the calcium carbonate in the slurry and the oxidizing air blown in and is removed. The final reaction product is gypsum. The desulfurized flue gas is removed from the fine droplets carried by the demister and is heated by the heater or discharged directly into the chimney without heating; the desulfurized gypsum slurry is dehydrated by the dehydration device and recovered. Since the absorption slurry can be recycled, the utilization rate of the desulfurization absorbent is high. At present, the main problem of limestone-gypsum wet desulfurization outside the circulating fluidized bed boiler is to further increase the desulfurization efficiency by optimizing the structure of the desulfurization tower without increasing the cost. Utility Model Content
[0003] In order to solve the above technical problems, the utility model provides a circulating fluidized bed boiler desulfurization device, which improves the desulfurization efficiency by optimizing the structures of the spray layer, the demister and the flue gas inlet, has a simple structure and low cost.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A circulating fluidized bed boiler desulfurization device comprises: a desulfurization tower, in which a slurry pool, a spraying area and a demister are arranged in sequence from bottom to top, a flue gas inlet is arranged on the lower side wall of the desulfurization tower, and a flue gas outlet is arranged on the top; it is characterized in that: the flue gas inlet comprises a tangential inlet one and a tangential inlet two, and extended baffles are arranged at the tangential inlet one and the tangential inlet two, the demister comprises two symmetrical sealing plates above and below, mounting holes are evenly arranged on the sealing plates, a pipe body is arranged in the mounting hole, a spiral blade is arranged in the middle of the pipe body, a flushing column is arranged in the center of the spiral blade, and a backwashing hole is arranged on the flushing column; the outer periphery of the spiral blade is fixedly connected to the inner wall of the pipe body, a through hole is arranged on one side of the spiral blade, and a guide pipe is arranged at the bottom of the spiral blade.
[0006] Furthermore, the flow guide tube is a hollow tube body, and the inner diameter of the middle part is smaller than the inner diameters of the upper part and the lower part.
[0007] Furthermore, the upper and lower parts of the flushing column are fixed to the inner wall of the tube body through grid plates respectively.
[0008] Furthermore, the spray area is provided with multiple layers of spray layers, each spray layer includes multiple rows of evenly arranged branch pipes, nozzles are evenly distributed on both sides of the branch pipes, both ends of the branch pipes are connected to liquid inlet pipes, the branch pipes are fixed by transverse and longitudinal support plates, annular reinforcement ribs are fixed on the outer periphery of the support plates, and the annular reinforcement ribs are fixedly connected to the inner wall of the desulfurization tower.
[0009] Furthermore, a circle of nozzles close to the inner wall of the desulfurization tower are 90° solid cone nozzles, and the inner circle nozzles are 120° hollow cone nozzles.
[0010] Furthermore, the horizontal angle between the tangential inlet 1 and the tangential inlet 2 is 10-12°.
[0011] Furthermore, a stirring paddle is provided in the slurry pool.
[0012] Compared with the prior art, the advantages and positive effects of the utility model are:
[0013] 1. In the spray layer, two liquid inlet pipes are used to connect the branch pipes, which balances the pressure, makes the layout more reasonable, and is less likely to be blocked. In addition, the peripheral support plate is fixed with annular reinforcement ribs, and the branch pipes and liquid inlet pipes are loaded on the support plate and the annular reinforcement ribs, which are relatively stable. The outer ring 90° solid cone nozzle has a small angle, which ensures no dead angle coverage while reducing the scouring of the tower wall. The inner ring 120° spray pressure is small, which is conducive to guiding the flue gas and reducing the pressure resistance.
[0014] 2. The flue gas inlet is a double tangential inlet. Flue gas from the fluidized bed boiler enters the tower along the tangential inlet, which weakens the power of the flue gas to diffuse into the tower, prolongs the residence time of the flue gas in the tower, and avoids the phenomenon of local over-dense flue gas due to the collision of two flue gases when there are double straight inlets. In addition, the inlet angle is designed to be 10-12°. A certain angle can reduce the position of mass transfer between the flue gas and the slurry pool to a certain extent and increase the residence time of the flue gas. Extending the baffle above the flue gas inlet section is conducive to the uniform distribution of the flow field of the flue gas inlet section and has a good effect of blocking the entry of the spray slurry.
[0015] 3. The demister includes two symmetrical sealing plates, one above the other, with mounting holes evenly arranged on the sealing plates, a tube body arranged in the mounting holes, a spiral blade arranged in the middle of the tube body, a flushing column fixed in the center of the spiral blade, a backwashing hole arranged on the column, and a flushing pipeline connected. A through hole is arranged on one side of the spiral blade, and a guide tube is arranged at the bottom of the spiral blade. The guide tube is a hollow tube body, and the inner diameter of the middle part is smaller than the inner diameter of the upper and lower parts. Therefore, the flue gas mixed with a large number of droplets after spraying first enters the guide tube. Since the inner diameter of the middle part of the guide tube is small, the contact time between the airflow and the inner wall of the guide tube can be extended, which is helpful for gas-liquid separation and preliminary separation of gas and liquid; then the airflow after preliminary separation continues to ascend through the grid plate, a part of it enters the space between the spiral blade and the tube body along the through hole on the right side of the spiral blade, and a part of it ascends along the spiral blade. The through hole can change part of the airflow path, increase the collision effect between the airflow and between the airflow and the spiral blade, increase the collision and aggregation effect of the droplets, thereby increasing the gas-liquid separation effect, and the demisting and desulfurization effect is good. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure of the desulfurization tower of the utility model;
[0017] Figure 2 for Figure 1 Structural diagram of the flue gas inlet;
[0018] Figure 3 is a structural schematic diagram of a sealing plate;
[0019] Figure 4 It is a structural schematic diagram of the demister;
[0020] Figure 5 It is a schematic diagram of the structure of the spray layer.
[0021] Legend:
[0022] 1-desulfurization tower, 2-slurry pool, 3-demister, 4-flue gas outlet, 5-tangential inlet 1, 6-tangential inlet 2, 7-extension baffle, 8-sealing plate, 9-mounting hole, 10-tube body, 11-spiral blade, 12-flushing column 12, 13-through hole, 14-guide pipe, 15-backwashing hole, 16-grid plate, 17-annular reinforcement rib, 18-branch pipe, 19-nozzle, 20-liquid inlet pipe, 21-support plate, 22-agitation paddle. DETAILED DESCRIPTION
[0023] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.
[0025] Embodiment 1, as Figure 1-5 As shown, the utility model provides a circulating fluidized bed boiler desulfurization device, including: a desulfurization tower 1, in which a slurry pool 2, a spraying area and a demister 3 are arranged from bottom to top. In order to prevent the desulfurizer in the slurry pool 2 from precipitating, a stirring paddle 22 is arranged in the slurry pool.
[0026] A flue gas inlet is arranged on the lower side wall of the desulfurization tower, and a flue gas outlet 4 is arranged on the top; the flue gas inlet includes a tangential inlet 1 5 and a tangential inlet 2 6 (the cross section is as shown in FIG. Figure 2 As shown in FIG. 1 ), the flue gas inlet in the present application is a double tangential inlet, which can prolong the residence time of the flue gas in the tower; an extended baffle 7 is provided at the tangential inlet 1 5 and the tangential inlet 2 6 to prevent the spray slurry from entering the flue gas inlet. In order to reduce the height of the mass transfer interface between the flue gas and the slurry pool, the horizontal angle between the tangential inlet 1 5 and the tangential inlet 2 6 is 10-12°, which prolongs the residence time of the flue gas in the tower. In this embodiment, the angle a is 10°.
[0027] The demister 3 includes two symmetrical upper and lower sealing plates 8, wherein the sealing plates 8 are fixedly connected to the inner wall of the desulfurization tower 1, and the specific connection method is: a fixing ring is arranged along the inner wall of the desulfurization tower on the outer periphery of the sealing plate 8, and the fixing ring is fixed to the inner wall of the desulfurization tower by bolts; the upper and lower sealing plates 8 are evenly arranged with mounting holes 9, and a pipe body 10 is arranged in the mounting holes 9, wherein the pipe body is connected to the sealing plate 8 by a flange, a spiral blade 11 is arranged in the middle of the pipe body 10, and the outer periphery of the spiral blade 11 is fixedly connected to the inner wall of the pipe body 10, and the center of the spiral blade 11 is a flushing column 12, and the flushing column is welded and fixed to the center of the spiral blade, and a plurality of backwashing holes 15 are arranged on the flushing column 12, wherein the upper part of the flushing column 15 is connected to the flushing pipeline, which is used to backwash the inside of the pipe body 10 to prevent the demister from being blocked. The upper and lower parts of the flushing column 15 are respectively fixed to the pipe body 10 by a grid plate 16, and the structure is stable.
[0028] A through hole 13 is provided at the right blade position of each circle of the spiral blade 11, and a guide tube 14 is provided at the bottom of the spiral blade 11, wherein the guide tube 14 is a hollow tube body, and the inner diameter of the middle part is smaller than the inner diameter of the upper part and the lower part. This structure can enhance the collision force between the airflow and the inner wall of the guide tube 14, thereby facilitating the separation of droplets and improving the demisting effect.
[0029] The spray area is provided with multiple spray layers, each of which includes multiple rows of evenly arranged branch pipes 18, nozzles 19 evenly distributed on the branch pipes 18, both ends of the branch pipes 18 are connected to the liquid inlet pipes 20, the branch pipes 18 are fixed by the longitudinally and transversely distributed support plates 21, the outer periphery of the support plate 21 is fixed with an annular reinforcement rib 17, and the annular reinforcement rib 17 is fixedly connected to the inner wall of the desulfurization tower 1, and the entire spray layer is reasonably laid out and has high stability. In addition, in order to reduce the scouring of the tower wall by the spray liquid, the circle of nozzles close to the inner wall of the desulfurization tower 1 is a 90° solid cone nozzle, and the inner circle nozzles within the periphery are 120° hollow cone nozzles, with low spray pressure, which is conducive to guiding the flue gas and reducing the pressure resistance.
[0030] The working principle of this embodiment is: the sulfur-containing sintering flue gas in the circulating fluidized bed boiler enters the desulfurization tower through the tangential inlet 1 5 and the tangential inlet 2 6 after dust removal. The design of the tangential double inlet can prolong the residence time of the flue gas and reduce the impact of the flue gas at the two inlets; since the tangential inlet 1 5 and the tangential inlet 2 6 have a certain horizontal angle, the position where the flue gas meets the slurry pool is lowered, which is conducive to the full diffusion of the flue gas and prolongs its residence time in the tower; then the flue gas ascends to the spray layer, and the desulfurization slurry in the slurry pool 2 is transported to the liquid inlet pipe 20 through the circulating pump, and then enters the nozzle 19 through the branch pipe 18 to achieve spraying, and gas-liquid contact desulfurization is performed; then the flue gas mixed with a large number of droplets continues to ascend to the demister 3, enters a plurality of evenly distributed pipe bodies 10, first passes through the guide pipe 14 to achieve preliminary gas-liquid separation, and then enters the space between the spiral blades and the pipe body 1 to continue to ascend, and the separation of droplets and gas is further achieved through the collision between the flue gas and the spiral blades, and the flue gas and each other, so as to achieve the effect of demisting. In addition, by controlling the opening of the flushing pipeline, the pipe body 1 can be backwashed to reduce blockage.
[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.
Claims
1. A circulating fluidized bed boiler desulfurization device, comprising: A desulfurization tower (1), wherein a slurry pool (2), a spraying area and a demister (3) are arranged in order from bottom to top in the desulfurization tower (1); a flue gas inlet is arranged on the lower side wall of the desulfurization tower, and a flue gas outlet (4) is arranged on the top; the flue gas inlet comprises a tangential inlet 1 (5) and a tangential inlet 2 (6); an extended baffle (7) is arranged at the tangential inlet 1 (5) and the tangential inlet 2 (6); the demister (3) comprises two symmetrical sealing plates (8) at the top and the bottom; the sealing plates (8) are symmetrically arranged at the bottom and the top of the desulfurization tower ... the demister (3) comprises two symmetrical sealing plates (8) at the top and the bottom; the sealing plates (8) are symmetrically arranged at the bottom and the top of the desulfurization tower; the flue gas inlet comprises a tangential inlet 1 (5) and a tangential inlet 2 (6); the tangential inlet ) are evenly arranged with mounting holes (9), a tube body (10) is arranged in the mounting holes (9), a spiral blade (11) is arranged in the middle of the tube body (10), a flushing column (12) is arranged in the center of the spiral blade (11), and a backwashing hole (15) is arranged on the flushing column (12); the outer periphery of the spiral blade (11) is fixedly connected to the inner wall of the tube body (10), a through hole (13) is arranged on one side of the spiral blade (11), and a guide tube (14) is arranged at the bottom of the spiral blade (11).
2. A circulating fluidized bed boiler desulfurization device according to claim 1, characterized in that: The flow guide tube (14) is a hollow tube body, and the inner diameter of the middle portion is smaller than the inner diameters of the upper portion and the lower portion.
3. A circulating fluidized bed boiler desulfurization device according to claim 1, characterized in that: The upper and lower parts of the flushing column (12) are respectively fixed to the inner wall of the pipe body (10) via grid plates (16).
4. A circulating fluidized bed boiler desulfurization device according to claim 1, characterized in that: The spraying area is provided with multiple spraying layers, each spraying layer comprises multiple rows of evenly arranged branch pipes (18), nozzles (19) are evenly distributed on both sides of the branch pipes (18), both ends of the branch pipes (18) are connected to the liquid inlet pipe (20), the branch pipes (18) are fixed by transverse and longitudinal support plates (21), annular reinforcement ribs (17) are fixed on the outer periphery of the support plates (21), and the annular reinforcement ribs (17) are fixedly connected to the inner wall of the desulfurization tower (1).
5. A circulating fluidized bed boiler desulfurization device according to claim 4, characterized in that: The nozzle circle close to the inner wall of the desulfurization tower (1) is a 90° solid cone nozzle, and the inner nozzle circle is a 120° hollow cone nozzle.
6. A circulating fluidized bed boiler desulfurization device according to claim 1, characterized in that: The horizontal angle between the tangential inlet 1 (5) and the tangential inlet 2 (6) is 10-12°.
7. A circulating fluidized bed boiler desulfurization device according to claim 1, characterized in that: A stirring paddle (22) is arranged in the slurry pool (2).