Ash removal and desulfurization device for thermal power plant

Abstract

The utility model relates to the technical field of flue gas treatment of a thermal power plant, in particular to an ash removal and desulfurization device of the thermal power plant, which comprises an outer cylinder, an ash removal and desulfurization cylinder, a smoke outlet, a gas cavity, a vent hole, a through hole, a sprayer, a U-shaped flue and an induced draft fan. Flue gas flowing into the ash removal and desulfurization cylinder from the gas inlet flue collides with gas flowing into the ash removal and desulfurization cylinder from the vent hole and the gas cavity through the multiple through holes, meanwhile, ash removal and desulfurization are conducted on the collided flue gas through a solvent sprayed out of the sprayer, and the gas obtained after ash removal and desulfurization is pumped out through the U-shaped flue and the induced draft fan. Ash mixed liquid generated after ash removal and desulfurization is discharged from the bottom of the ash removal and desulfurization cylinder; according to the utility model, the retention time of flue gas in the ash removal and desulfurization cylinder is prolonged, so that the flue gas is fully mixed with a solvent, the ash removal and desulfurization effects are improved, and the desulfurization efficiency is higher.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology in thermal power plants, specifically to a desulfurization and ash removal device for thermal power plants. Background Technology

[0002] Currently, with increasingly stringent environmental protection requirements, the emission standards for flue gas from thermal power plants and other similar facilities are also becoming more stringent. Therefore, existing combustion furnaces are generally equipped with ash removal and desulfurization equipment to reduce the ash and sulfur oxide content of emitted flue gas. At present, my country's desulfurization and dust removal technologies mainly consist of wet and dry methods, both utilizing corresponding physicochemical and physical reactions for desulfurization and dust removal. However, certain problems also exist. Due to unreasonable flue design in existing thermal power plant ash removal and desulfurization devices, high dust concentrations can lead to accumulation and scaling blockages in the pipes, resulting in poor ash removal and desulfurization effects and low efficiency. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned shortcomings by providing a thermal power plant ash removal and desulfurization device that can effectively extend the residence time of flue gas in the device, resulting in better ash removal and desulfurization effects and higher efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A desulfurization and ash removal device for a thermal power plant includes an outer cylinder and a desulfurization and ash removal cylinder disposed within the outer cylinder. The flue gas inlet of the desulfurization and ash removal cylinder is connected to the exhaust gas outlet of the thermal power plant equipment. A closed air chamber is formed between the desulfurization and ash removal cylinder and the outer cylinder. A vent is provided at the top of the outer cylinder. Multiple through holes communicating with the air chamber are provided on the inner side wall of the desulfurization and ash removal cylinder. A sprayer is provided at the top of the desulfurization and ash removal cylinder. A connection to the desulfurization and ash removal cylinder is provided on one side of the outer cylinder. The U-shaped flue inside the cylinder is equipped with an induced draft fan. Under the action of the U-shaped flue and the induced draft fan, the flue gas flowing into the desulfurization and ash removal cylinder from the inlet flue collides with the gas flowing into the desulfurization and ash removal cylinder from the ventilation holes and gas chamber through multiple through holes. At the same time, the solvent sprayed by the sprayer removes ash and sulfur from the colliding flue gas. The gas after ash and sulfur removal is extracted by the U-shaped flue and the induced draft fan. The flue gas mixture generated after ash and sulfur removal is discharged from the bottom of the desulfurization and ash removal cylinder.

[0006] Preferably, the top of the ash removal and desulfurization cylinder is lower than the top of the outer cylinder, the top of the outer cylinder is covered with a cover plate, the top of the ash removal and desulfurization cylinder is closed, and an installation space is formed between the cover plate and the top of the closed ash removal and desulfurization cylinder, which is used to install the sprayer.

[0007] Preferably, the sprayer includes a hollow liquid plate that seals the top of the desulfurization and ash removal cylinder and a plurality of nozzles installed on the bottom surface of the hollow liquid plate, and a liquid supply pipe that passes through the cover plate and the installation space at one end and communicates with the interior of the hollow liquid plate. The nozzles are in communication with the interior of the hollow liquid plate.

[0008] Preferably, the top end face of the ash removal and desulfurization cylinder extends outward to abut against the inner wall of the outer cylinder, and the bottom end face of the outer cylinder extends inward to a bottom edge connected to the bottom of the ash removal and desulfurization cylinder. The inner edge, the outer wall of the ash removal and desulfurization cylinder, and the outer edge and the inner wall of the outer cylinder together form the gas cavity.

[0009] Preferably, the outer edge is provided with multiple air passages connecting the air cavity and the installation space. When the induced draft fan is working, it draws external gas sequentially through the vent hole, the installation space, the air passage, the air cavity, and the vent hole into the ash removal and desulfurization cylinder.

[0010] Preferably, the lower side wall of the ash removal and desulfurization cylinder is provided with an exhaust pipe, and one end of the U-shaped flue is connected to the inside of the ash removal and desulfurization cylinder through the exhaust pipe.

[0011] Preferably, a water film injector is provided at one end of the U-shaped flue near the induced draft fan, and the water film injector can spray aerosol into the U-shaped flue.

[0012] Preferably, one end of the exhaust pipe is connected to the end of a vertical section of the U-shaped flue, the induced draft fan is connected to the end of the other vertical section of the U-shaped flue, and the water film injector is disposed in the vertical section of the U-shaped flue and close to the induced draft fan.

[0013] Preferably, the bottom end of the U-shaped flue is provided with a discharge pipe for discharging the gas-liquid mixture inside the U-shaped flue.

[0014] Preferably, the bottom of the desulfurization and ash removal cylinder is provided with a conical drain cylinder that can discharge the flue gas mixture. The bottom end of the conical drain cylinder is connected to the sewage discharge channel, and the bottom end of the discharge pipe is connected to the sewage discharge channel.

[0015] The beneficial effects of this utility model are:

[0016] As can be seen from the above technical solution, when this utility model is in use, under the action of the U-shaped flue and the induced draft fan, the flue gas flowing into the desulfurization and ash removal cylinder from the flue gas inlet collides with the gas flowing into the desulfurization and ash removal cylinder from the ventilation holes and gas chamber through multiple through holes. At the same time, the solvent sprayed by the sprayer removes ash and sulfur from the colliding flue gas. The gas after desulfurization and ash removal is extracted by the U-shaped flue and the induced draft fan. The flue gas mixture produced after desulfurization and ash removal is discharged from the bottom of the desulfurization and ash removal cylinder. This utility model not only prolongs the residence time of the flue gas in the desulfurization and ash removal cylinder, allowing the flue gas and solvent to mix fully and improving the desulfurization and ash removal effect, but also creates a negative pressure in the desulfurization and ash removal cylinder under the action of the induced draft fan, which is conducive to the discharge of flue gas, making it less likely to accumulate and less prone to scaling and blockage. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the ash removal and desulfurization cylinder in this utility model;

[0020] Figure reference numerals: 1. Ash removal and desulfurization cylinder; 11. Flue gas inlet; 12. Through hole; 13. Outer edge; 14. Air duct; 15. Exhaust pipe; 2. Outer cylinder; 21. Cover plate; 22. Installation space; 23. Inner edge; 24. Vent hole; 3. Air chamber; 4. Sprayer; 41. Hollow liquid plate; 42. Spray head; 43. Liquid supply pipe; 5. Exhaust fan; 6. U-shaped flue; 61. Discharge pipe; 7. Water film jetter; 8. Conical liquid discharge cylinder; 9. Sewage discharge duct. Detailed Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0022] like Figure 1 and Figure 2As shown, a desulfurization and ash removal device for a thermal power plant includes an outer cylinder 2 and a desulfurization and ash removal cylinder 1 disposed inside the outer cylinder 2. The flue gas inlet 11 of the desulfurization and ash removal cylinder is connected to the exhaust port of the thermal power plant equipment. A closed air chamber 3 is formed between the desulfurization and ash removal cylinder 1 and the outer cylinder 2. A vent hole 24 is provided at the top of the outer cylinder 2. Multiple through holes 12 communicating with the air chamber 3 are opened on the inner side wall of the desulfurization and ash removal cylinder 1. A sprayer 4 is provided at the top of the desulfurization and ash removal cylinder 1. A sprayer 4 communicating with the desulfurization and ash removal cylinder 3 is provided on one side of the outer cylinder 2. The U-shaped flue 6 inside the desulfurization cylinder 1 is equipped with an induced draft fan 5. Under the action of the U-shaped flue 6 and the induced draft fan 5, the flue gas flowing into the desulfurization cylinder 1 from the inlet flue 11 collides with the gas flowing into the desulfurization cylinder 1 from the vent 24 and the gas chamber 3 through multiple through holes 12. At the same time, the solvent sprayed by the sprayer 4 removes ash and desulfurizes the colliding flue gas. The gas after ash and desulfurization is extracted by the U-shaped flue 6 and the induced draft fan 5. The flue gas mixture generated after ash and desulfurization is discharged from the bottom of the desulfurization cylinder 1.

[0023] Under the action of the U-shaped flue 6 and the induced draft fan 5, the flue gas flowing into the desulfurization and ash removal cylinder 1 from the inlet flue 11 collides with the gas flowing into the desulfurization and ash removal cylinder 1 from the vent 24 and the gas chamber 3 through multiple through holes 12. At the same time, the solvent sprayed by the sprayer 4 removes ash and sulfur from the colliding flue gas. The gas after desulfurization and ash removal is extracted by the U-shaped flue 6 and the induced draft fan 5. The flue gas mixture produced after desulfurization and ash removal is discharged from the bottom of the desulfurization and ash removal cylinder 1. This utility model not only prolongs the residence time of the flue gas in the desulfurization and ash removal cylinder, allowing the flue gas to mix fully with the solvent, thus improving the desulfurization and ash removal effect and achieving higher desulfurization efficiency, but also creates a negative pressure in the desulfurization and ash removal cylinder under the action of the induced draft fan, which is conducive to the discharge of flue gas, making it less likely to accumulate or cause scaling and blockage.

[0024] like Figure 1 and Figure 2 As shown, the top of the ash removal and desulfurization cylinder 1 is lower than the top of the outer cylinder 2. The top of the outer cylinder 2 is covered by a cover plate 21, and the top of the ash removal and desulfurization cylinder 1 is closed. An installation space 22 is formed between the cover plate 21 and the closed top of the ash removal and desulfurization cylinder 1. This installation space is used to install the sprayer 4. In this embodiment, by making the top of the ash removal and desulfurization cylinder 1 lower than the top of the outer cylinder 2, the layout is more reasonable, saves space, and facilitates the installation, disassembly, and maintenance of the sprayer 4.

[0025] like Figure 1 and Figure 2As shown, the sprayer 4 includes a hollow liquid plate 41 that seals the top of the desulfurization and ash removal cylinder 1 and multiple nozzles 42 installed on the bottom surface of the hollow liquid plate 41. A liquid supply pipe 43, one end of which passes through the cover plate 21 and the installation space 22 and communicates with the interior of the hollow liquid plate 41, is connected to the interior of the hollow liquid plate 41. In this embodiment, solvent is supplied to the interior of the hollow liquid plate 41 through the liquid supply pipe 43, and then the solvent is sprayed into the desulfurization and ash removal cylinder by several nozzles 42. The solvent is generally a foaming agent that can remove ash and sulfur. The hollow liquid plate 41 not only seals the desulfurization and ash removal cylinder 1, but also facilitates the installation and layout of the nozzles 42, which can cover a large area of ​​the inner cavity of the desulfurization and ash removal cylinder 1 and improve the spraying effect.

[0026] During implementation, the top end of the ash removal and desulfurization cylinder 1 extends outward to abut against the inner wall of the outer cylinder 2, and the bottom end of the outer cylinder 2 extends inward to abut against the bottom end of the ash removal and desulfurization cylinder 2. The inner edge 23, the outer wall of the ash removal and desulfurization cylinder 1, the outer edge 13 and the inner wall of the outer cylinder 2 together form the air cavity 3. In this embodiment, under the power of the induced draft fan 5, air can be continuously and evenly supplied into the ash removal and desulfurization cylinder 1, which is conducive to the discharge of flue gas, and is not easy to cause accumulation or scaling and blockage.

[0027] like Figure 1 and Figure 2 As shown, the outer edge 13 is provided with multiple air passages 14 that connect the air chamber and the installation space. When the induced draft fan 5 is working, it draws external gas sequentially through the vent 24, the installation space 22, the air passages 14, the air chamber 3, and the through hole 12 into the ash removal and desulfurization cylinder 1. In this embodiment, the air entering through the vent 24 and the installation space 22 is drawn into the air chamber 3 through the air passages 14, so as to supply air evenly, which is conducive to the discharge of flue gas, and is not easy to cause accumulation or scaling and blockage.

[0028] like Figure 1 and Figure 2 As shown, the lower side wall of the desulfurization and ash removal cylinder 1 is provided with an exhaust pipe 15, and one end of the U-shaped flue 6 is connected to the interior of the desulfurization and ash removal cylinder 1 through the exhaust pipe 15; in this embodiment, the U-shaped flue 6 is connected to the interior of the desulfurization and ash removal cylinder 1 through the exhaust pipe 15.

[0029] like Figure 1 and Figure 2 As shown, a water film injector 7 is provided at one end of the U-shaped flue 6 near the induced draft fan 5. The water film injector 7 can spray a spray into the U-shaped flue 6. In this embodiment, the spray can be water or a reagent with added desulfurizing agent to improve the desulfurization effect.

[0030] like Figure 1 and Figure 2As shown, one end of the exhaust pipe 15 is connected to the end of a vertical section of the U-shaped flue 6, and the induced draft fan 5 is connected to the other end of the vertical section of the U-shaped flue 6. The water film injector 7 is located in the vertical section of the U-shaped flue 6 and is positioned close to the induced draft fan 5. In this embodiment, when the flue gas rises in the U-shaped flue 6, it must pass through the water film sprayed by the water film injector 7. Thus, under the dual action of the flue gas's own gravity and the water film, ash removal and desulfurization are achieved, further improving the ash removal and desulfurization effect.

[0031] like Figure 1 and Figure 2 As shown, the bottom end of the U-shaped flue 6 is provided with a discharge pipe 61 for discharging the gas-liquid mixture inside the U-shaped flue 6; in this embodiment, the mixture can be discharged by its own gravity through the discharge pipe 61.

[0032] like Figure 1 and Figure 2 As shown, the bottom of the desulfurization and ash removal cylinder 1 is provided with a conical discharge cylinder 8 that can discharge the flue gas mixture. The bottom end of the conical discharge cylinder is connected to the sewage discharge channel 9, and the bottom end of the discharge pipe 61 is connected to the sewage discharge channel 9. In this embodiment, the gas-liquid mixture discharged from the conical discharge cylinder 8 and the discharge pipe 61 can be uniformly treated through the sewage discharge channel 9, thereby reducing environmental pollution.

[0033] The specific embodiments described herein are merely illustrative examples of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the scope defined by this utility model.

Claims

1. A desulfurization and ash removal device for a thermal power plant, characterized in that: The device includes an outer cylinder (2), a desulfurization and ash removal cylinder (1) disposed inside the outer cylinder (2), the flue gas inlet (11) of the desulfurization and ash removal cylinder (1) being connected to the exhaust port of the power plant equipment, a closed air chamber (3) being formed between the desulfurization and ash removal cylinder (1) and the outer cylinder (2), a vent hole (24) being provided at the top of the outer cylinder (2), a plurality of through holes (12) being provided on the inner side wall of the desulfurization and ash removal cylinder (1) connecting to the air chamber (3), a sprayer (4) being provided at the top of the desulfurization and ash removal cylinder (1), and a channel connecting to the interior of the desulfurization and ash removal cylinder (1) being provided on one side of the outer cylinder (2). The U-shaped flue (6) is equipped with an induced draft fan (5). Under the action of the U-shaped flue (6) and the induced draft fan (5), the flue gas flowing into the desulfurization and ash removal cylinder (1) from the flue (11) collides with the gas flowing into the desulfurization and ash removal cylinder (1) from the ventilation hole (24) and the gas chamber (3) through multiple through holes (12). At the same time, the solvent sprayed by the sprayer (4) removes ash and sulfur from the collided flue gas. The gas after desulfurization and ash removal is extracted by the U-shaped flue (6) and the induced draft fan (5). The flue gas mixture generated after desulfurization and ash removal is discharged from the bottom of the desulfurization and ash removal cylinder (1).

2. The ash removal and desulfurization device for thermal power plants according to claim 1, characterized in that: The top of the desulfurization and ash removal cylinder (1) is lower than the top of the outer cylinder (2). The top of the outer cylinder (2) is covered by a cover plate (21). The top of the desulfurization and ash removal cylinder (1) is closed. An installation space (22) is formed between the cover plate (21) and the closed top of the desulfurization and ash removal cylinder (1). The installation space (22) is used to install the sprayer (4).

3. The desulfurization and ash removal device for thermal power plants according to claim 2, characterized in that: The sprayer (4) includes a hollow liquid plate (41) that seals the top of the desulfurization and ash removal cylinder (1) and a plurality of nozzles (42) installed on the bottom surface of the hollow liquid plate (41). A liquid supply pipe (43) passes through the cover plate (21) and the installation space (22) and communicates with the inside of the hollow liquid plate (41). The nozzles (42) are in communication with the inside of the hollow liquid plate (41).

4. The ash removal and desulfurization device for thermal power plants according to claim 3, characterized in that: The top end of the desulfurization and ash removal cylinder (1) extends outward to abut against the inner wall of the outer cylinder (2), and the bottom end of the outer cylinder (2) extends inward to abut against the bottom end of the desulfurization and ash removal cylinder (1). The inner edge (23), the outer wall of the desulfurization and ash removal cylinder (1), the outer edge (13), and the inner wall of the outer cylinder (2) together form the gas cavity (3).

5. The ash removal and desulfurization device for thermal power plants according to claim 4, characterized in that: The outer edge (13) is provided with multiple air passages (14) that connect the air chamber and the installation space. When the blower (5) is working, it draws external gas into the desulfurization cylinder (1) through the ventilation hole (24), the installation space (22), the air passage (14), the air chamber (3), and the through hole (12) in sequence.

6. The ash removal and desulfurization device for thermal power plants according to claim 1, characterized in that: The lower side wall of the desulfurization and ash removal cylinder (1) is provided with an exhaust pipe (15), and one end of the U-shaped flue (6) is connected to the interior of the desulfurization and ash removal cylinder (1) through the exhaust pipe (15).

7. The ash removal and desulfurization device for thermal power plants according to claim 6, characterized in that: A water film injector (7) is provided at one end of the U-shaped flue (6) near the induced draft fan (5), and the water film injector (7) can spray spray into the U-shaped flue (6).

8. The ash removal and desulfurization device for thermal power plants according to claim 7, characterized in that: One end of the exhaust pipe (15) is connected to the end of a vertical section of the U-shaped flue (6), the induced draft fan (5) is connected to the end of the other vertical section of the U-shaped flue (6), and the water film injector (7) is located in the vertical section of the U-shaped flue (6) and close to the induced draft fan (5).

9. The desulfurization and ash removal device for thermal power plants according to claim 8, characterized in that: The bottom end of the U-shaped flue (6) is provided with a discharge pipe (61) that can discharge the gas-liquid mixture inside the U-shaped flue (6).

10. The ash removal and desulfurization device for thermal power plants according to claim 9, characterized in that: The bottom of the desulfurization and ash removal cylinder (1) is provided with a conical drain cylinder (8) that can discharge the flue gas mixture. The bottom end of the conical drain cylinder (8) is connected to the sewage channel (9), and the bottom end of the discharge pipe (61) is connected to the sewage channel (9).

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