Two-stage dust removal and desulfurization composite device

Abstract

The utility model belongs to the technical field of gas pretreatment of gas-fired boilers in power plants, and discloses a two-stage dust removal and desulfurization composite device, which comprises a first-stage dust remover and a second-stage desulfurizer which are adjacently arranged, and a gas inlet pipe extending into a dust removal cylinder is arranged on the top surface of the dust removal cylinder; cyclone flow deflectors I are arranged on the periphery of the air inlet pipe and the inner wall of the dust removal barrel; spray guns are arranged on the side wall of the dedusting cylinder; a gas outlet pipe is arranged on the top surface of the desulfurization cylinder and extends into the desulfurization cylinder; cyclone flow deflectors II are arranged on the periphery of the gas outlet pipe and the inner wall of the desulfurization cylinder; a desulfurizing agent outlet is formed in the bottom of the secondary desulfurizer; a pneumatic circulating conveying system is arranged on the desulfurizing agent outlet; the pneumatic circulating conveying system comprises a pneumatic valve, a nitrogen pipeline, a bin pump and a feeding bin; the desulfurizer outlet is connected with a bin pump through a pneumatic valve, and a conveying valve I is arranged on the bin pump and connected with a spray gun through a nitrogen pipeline. The dust removal and desulfurization efficiency reaches 99.9%, the utilization rate of the desulfurizing agent is 99% or above, and the consumption of the desulfurizing agent is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of pretreatment of coal gas from gas-fired boilers in power plants, and is used in the pre-dust removal and preliminary desulfurization of blast furnace coal gas used in gas-fired boilers in power plants, and is specifically a two-stage dust removal and desulfurization composite device. Background Art

[0002] Generally, steel mills build their own power plant boilers to generate electricity, and the fuel is the blast furnace gas produced by the steel mills. The blast furnace gas used as fuel contains harmful components such as SO3, SO2 and dust. The dusty gas affects the combustion calorific value, resulting in low boiler combustion efficiency; the sulfur-containing gas leads to a high sulfur content in the flue gas discharged by the boiler, and the subsequent desulfurization device operates at a high load, which affects the final flue gas emission.

[0003] The composite dust removal and desulfurization equipment disclosed in CN2452603Y comprises a primary dust removal and desulfurization device, a secondary dust removal and aerosol separator and a venturi ejector. Although the primary dust removal and desulfurization device and the secondary dust removal and aerosol separator are arranged side by side, the utilization efficiency of the desulfurization agent is not high. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a two-stage dust removal and desulfurization composite device with a dust removal and desulfurization efficiency of 99.9%, a desulfurization agent utilization rate of more than 99%, and reduced desulfurization agent consumption.

[0005] In order to solve the above technical problems, the utility model provides a two-stage dust removal and desulfurization composite device, including a primary dust collector and a secondary desulfurizer, which are arranged side by side and adjacent to each other; an air inlet pipe is arranged on the top surface of the dust removal cylinder of the primary dust collector, and the air inlet pipe extends into the interior of the dust removal cylinder; a cyclone guide plate I is arranged on the outer periphery of the air inlet pipe and the inner wall of the dust removal cylinder; a spray gun is arranged on the side wall of the dust removal cylinder; an air outlet pipe is arranged on the top surface of the desulfurization cylinder of the secondary desulfurizer, and the air outlet pipe extends into the interior of the desulfurization cylinder; a cyclone guide plate II is arranged on the outer periphery of the air outlet pipe and the inner wall of the desulfurization cylinder; an ash discharge port is arranged at the bottom of the primary dust collector; a pneumatic circulation conveying system is arranged on the desulfurizer outlet at the bottom of the secondary desulfurizer; the pneumatic circulation conveying system includes a pneumatic valve, a nitrogen pipeline, a silo pump and a feeding silo; the desulfurizer outlet is connected to the silo pump through a pneumatic valve, a conveying valve I is arranged on the silo pump, and the conveying valve I is connected to the spray gun through a nitrogen pipeline.

[0006] By adopting the above technical scheme, the pneumatic circulation conveying system equipped with pneumatic valves, nitrogen pipelines, and silo pumps is applied to the two-stage dust removal and desulfurization device. The dust and sulfur-containing coal gas is dedusted by the first-stage dust collector and then desulfurized by the second-stage desulfurizer. The dust removal and desulfurization efficiency reaches 99.9%. The desulfurizer deposited in the second-stage desulfurizer is transported to the first-stage dust collector through the nitrogen pipeline and spray gun for secondary recycling. The utilization rate of the desulfurizer is more than 99%, which greatly saves the consumption of the desulfurizer.

[0007] Preferably, the adjacent surfaces of the dust removal cylinder and the desulfurization cylinder share a common cylinder, and through holes are provided on the adjacent surfaces.

[0008] By adopting the above technical solution, the dusty and sulfur-containing coal gas directly flows from the through hole to the secondary desulfurizer for desulfurization after being dedusted by the primary dust collector, thereby simplifying the dust-removed coal gas circulation structure.

[0009] Preferably, a heat-insulating layer is provided on the surface of the dust removal cylinder and the desulfurization cylinder.

[0010] By adopting the above technical solution, the flue gas is insulated to prevent the coal temperature from being too low and water from being precipitated, thereby avoiding the occurrence of ash material compaction.

[0011] Preferably, cyclone guide vane I and cyclone guide vane II are spiral-shaped.

[0012] By adopting the above technical solution, the sulfur-containing coal gas spirally rises under the action of the guide vane, which increases the flow of the airflow and puts the airflow in a turbulent state.

[0013] Preferably, a fluidizing valve is provided on the side wall of the silo pump through a pipeline, and the fluidizing valve is connected to the nitrogen pipeline; a delivery valve II is provided on the nitrogen pipeline between the delivery valve I and the spray gun.

[0014] By adopting the above technical solution, the desulfurizer in the silo pump is fluidized with nitrogen, pneumatically transported to the spray gun, and sprayed into the primary dust collector, thereby realizing the recycling of the desulfurizer.

[0015] Preferably, a feeding silo is provided on the nitrogen pipeline between the silo pump and the delivery valve II via a feeding valve.

[0016] By adopting the above technical solution, new desulfurizer is manually added through the feeding bin, and then the desulfurizer is sprayed into the primary dust collector through the pneumatic conveying system, so the new desulfurizer is added conveniently.

[0017] Preferably, the nitrogen pipeline is connected to the waste bin via a delivery valve III.

[0018] By adopting the above technical solution, after multiple cycles of reaction, the reaction rate of the desulfurizer has reached 99% after testing. The conveying valve III is opened to transport the reactants to the waste bin through the pneumatic conveying system, which is convenient for the unified and standardized treatment of desulfurizer waste.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The utility model applies a pneumatic circulation conveying system equipped with pneumatic valves, nitrogen pipelines, and silo pumps to a two-stage dust removal and desulfurization device. The dust-containing and sulfur-containing coal gas is dedusted by a primary dust collector, and then desulfurized by a secondary desulfurizer. The dust removal and desulfurization efficiency reaches 99.9%. The desulfurizer deposited in the secondary desulfurizer is transported to the primary dust collector through a nitrogen pipeline and a spray gun for secondary recycling. The utilization rate of the desulfurizer is more than 99%, which greatly saves the consumption of the desulfurizer.

[0021] 2. In the utility model, the dusty and sulfur-containing coal gas flows directly from the through hole to the secondary desulfurizer for desulfurization after being dedusted by the primary dust collector, thereby simplifying the dust-removed coal gas circulation structure.

[0022] 3. After the desulfurizer in the silo pump of the utility model is fluidized with nitrogen, it is pneumatically transported to the spray gun and sprayed into the primary dust collector to achieve the recycling of the desulfurizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the utility model in which the inner wall of the dust removal cylinder is provided with a cyclone guide piece I, and the inner wall of the desulfurization cylinder is provided with a cyclone guide piece II;

[0025] Figure 3 This is a schematic diagram of the pneumatic circulation conveying system of the utility model;

[0026] Figure 4 This is a schematic diagram of the connection between the silo pump, fluidizing valve and delivery valve I of the utility model.

[0027] Figure number: 1. Air inlet, 2. Primary dust collector, 3. Air outlet, 4. Secondary desulfurizer, 5. Cyclone guide vane I, 6. Insulation layer, 7. Desulfurizer outlet, 8. Pneumatic valve, 9. Nitrogen pipeline, 10. Silo pump, 11. Feeding silo, 12. Ash discharge port, 13. Spray gun, 14. Cyclone guide vane II, 15. Through hole, 16. Fluidizing valve, 17. Delivery valve I, 18. Delivery valve II, 19. Delivery valve III, 20. Feeding valve. DETAILED DESCRIPTION

[0028] like Figure 1 As shown, the two-stage dust removal and desulfurization composite device includes a primary dust collector 2 and a secondary desulfurizer 4, which are arranged side by side and adjacent to each other; the adjacent surfaces of the dust removal cylinder and the desulfurization cylinder share a common cylinder, and a through hole 15 is provided on the adjacent surface. After dust removal by the primary dust collector 2, the dust-containing and sulfur-containing coal gas directly flows from the through hole 15 to the secondary desulfurizer 4 for desulfurization, which simplifies the dust removal coal gas circulation structure.

[0029] like Figure 2As shown, the top surface of the dust removal cylinder of the primary dust collector 2 is provided with an air inlet pipe 1 extending into the interior of the dust removal cylinder; the outer periphery of the air inlet pipe 1 and the inner wall of the dust removal cylinder are provided with a cyclone guide piece Ⅰ5; the side wall of the dust removal cylinder is provided with a spray gun 13; and the bottom of the primary dust collector 2 is provided with an ash discharge port 12. The top surface of the desulfurization cylinder of the secondary desulfurizer 4 is provided with an air outlet pipe 3, and the air outlet pipe 3 extends into the interior of the desulfurization cylinder; the outer periphery of the air outlet pipe 3 and the inner wall of the desulfurization cylinder are provided with a cyclone guide piece Ⅱ14. The bottom of the secondary desulfurizer 4 is provided with a desulfurizer outlet 7, and the desulfurizer outlet 7 is provided with a pneumatic circulation conveying system.

[0030] like Figure 3 As shown, the pneumatic circulation conveying system includes a pneumatic valve 8, a nitrogen pipeline 9, a silo pump 10 and a feeding silo 11; the desulfurizer outlet 7 is connected to the silo pump 10 through the pneumatic valve 8, and the silo pump 10 is provided with a conveying valve Ⅰ17, and the conveying valve Ⅰ17 is connected to the spray gun 13 through the nitrogen pipeline 9.

[0031] A charging bin 11 is provided on the nitrogen pipeline 9 between the bin pump 10 and the delivery valve II 18 through a charging valve 20. New desulfurizer is manually added through the charging bin 11, and then the desulfurizer is sprayed into the primary dust collector 2 through a pneumatic conveying system, so that the new desulfurizer is added conveniently.

[0032] The nitrogen pipeline 9 is connected to the waste bin through the delivery valve III 19. After the desulfurizer has been circulated for many times, the reaction rate has reached 99% after testing. The delivery valve III 19 is opened to deliver the reactants to the waste bin through the pneumatic delivery system, so as to facilitate the unified and standardized treatment of the desulfurizer waste.

[0033] like Figure 4 As shown, a fluidizing valve 16 is provided on the side wall of the silo pump 10 through a pipeline, and the fluidizing valve 16 is connected to the nitrogen pipeline 9; a delivery valve II 18 is provided on the nitrogen pipeline 9 between the delivery valve I 17 and the spray gun 13. After the desulfurizer in the silo pump 10 is fluidized with nitrogen, it is pneumatically delivered to the spray gun 13 and sprayed into the primary dust collector 2 to realize the recycling of the desulfurizer.

[0034] A first-stage dust collector 2 is provided, and an air inlet pipe 1 extends from the top into the dust removal cylinder. The dust-containing and sulfur-containing coal gas flows from top to bottom along the air inlet pipe 1, and turns 180 degrees at the bottom of the pipe, changing from the original downward movement to an upward movement. Dust with larger particles settles in the ash hopper under the action of its own gravity and inertia.

[0035] Cyclone guide vane Ⅰ5, cyclone guide vane Ⅱ14 and spray gun 13 are provided. The guide vane is spiral and made of wear-resistant steel. The desulfurizer is sprayed into the dust removal cylinder by the spray gun 13. The sulfur-containing coal gas spirally rises under the action of the guide vane, which increases the flow of the airflow and makes the airflow in a turbulent state. The spray gun 13 is provided on the wall of the dust removal cylinder of the primary dust collector 2. The desulfurizer is sprayed into the coal gas through the spray gun 13. The desulfurizer and the coal gas are fully mixed and react while flowing. The desulfurizer and the coal gas are fully mixed and reacted.

[0036] A secondary desulfurizer 4, a cyclone guide plate II 14 and an outlet pipe 3 are provided. The coal gas flows from the top space of the primary dust collector 2 into the top space of the secondary desulfurizer 4, flows downward along the spiral of the cyclone guide plate II 14, and changes direction 180° upward at the bottom, and is discharged from the outlet pipe 3. The small amount of desulfurizer remaining in the coal gas slowly settles into the bottom ash hopper under the action of its own gravity and inertia. 60% of the particles in the ash hopper are the products of the desulfurization reaction, and 40% are the desulfurizer that has not yet reacted, which needs to be recycled for a second time.

[0037] A pneumatic circulation conveying system is provided, including pneumatic valve 8, nitrogen pipeline 9, silo pump 10, feeding silo 11, spray gun 13 and wear-resistant ash conveying pipeline: nitrogen pipeline 9. The desulfurization reactants and unreacted desulfurizer accumulated in the ash hopper of the secondary desulfurizer 4 enter the silo pump 10, are fluidized with nitrogen, and are pneumatically conveyed to the spray gun 13 and sprayed into the primary dust collector 2, and the desulfurizer begins to be circulated for the second time.

[0038] A feeding bin 11 is provided. After the desulfurizer has been subjected to multiple cycles of reaction, it is detected that the reaction rate has reached 99% and when the unreacted desulfurizer is less than 1%, the reactants are transported to the waste bin through a pneumatic conveying system, and then new desulfurizer is manually added through the feeding bin 11, and then the desulfurizer is sprayed into the primary dust collector 2 through the pneumatic conveying system.

[0039] The clean coal gas after dust removal and desulfurization is discharged from the gas outlet pipe 3. The dust removal efficiency of the device is 99.9%, the desulfurization efficiency is 99.9%, and the desulfurization agent utilization rate is more than 99%.

[0040] The heat-insulating layer 6 is provided, comprising ultra-fine glass wool, a protective layer and hook nails. The heat-insulating layer 6 performs heat-insulating treatment on the flue gas to prevent water from being precipitated due to excessively low coal temperature and to avoid the occurrence of ash material hardening.

[0041] The present application is equipped with a primary dust collector 2, with a dust removal efficiency of 99.9%; a secondary desulfurizer 4, with a desulfurization efficiency of 99.9%; a pneumatic circulation conveying system equipped with a pneumatic valve 8, a nitrogen pipeline 9, and a silo pump 10 is applied to the two-stage dust removal and desulfurization device, and the desulfurizer deposited in the secondary desulfurizer (4) is transported to the primary dust collector 2 through the nitrogen pipeline 9 and the spray gun 13 for secondary recycling. The utilization rate of the desulfurizer is more than 99%, which greatly saves the consumption of the desulfurizer. The equipment has a compact structure and a small footprint, and realizes a high-efficiency, composite, and integrated design. It is easy to install and maintain, and saves initial investment. The desulfurizer is repeatedly recycled, with a utilization rate of 99%, which greatly reduces the consumption of the desulfurizer and saves operating costs. After dust removal and desulfurization treatment, the combustion calorific value of the coal gas is improved, and the consumption of the coal gas is reduced overall, which has huge economic benefits. The reduction of ash in the coal gas is conducive to reducing the dust content of the boiler flue gas, which is beneficial to extending the service life of the boiler and subsequent process equipment.

[0042] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed or modified in any way.

Claims

1. A two-stage dust removal and desulfurization composite device, comprising a primary dust collector (2) and a secondary desulfurizer (4), the two being arranged side by side and adjacent to each other; characterized in that: The top surface of the dust removal cylinder of the primary dust collector (2) is provided with an air inlet pipe (1), which extends into the interior of the dust removal cylinder; a cyclone guide piece I (5) is provided on the outer periphery of the air inlet pipe (1) and the inner wall of the dust removal cylinder; a spray gun (13) is provided on the side wall of the dust removal cylinder; an air outlet pipe (3) is provided on the top surface of the desulfurization cylinder of the secondary desulfurizer (4), which extends into the interior of the desulfurization cylinder; a cyclone guide piece II ( 14); a pneumatic circulation conveying system is arranged on the desulfurizing agent outlet (7) at the bottom of the secondary desulfurizer (4); the pneumatic circulation conveying system comprises a pneumatic valve (8), a nitrogen pipeline (9), a silo pump (10) and a feeding silo (11); the desulfurizing agent outlet (7) is connected to the silo pump (10) via the pneumatic valve (8), the silo pump (10) is provided with a conveying valve I (17), and the conveying valve I (17) is connected to the spray gun (13) via the nitrogen pipeline (9).

2. The two-stage dust removal and desulfurization composite device according to claim 1 is characterized in that: The adjacent surfaces of the dust removal cylinder and the desulfurization cylinder share a common cylinder, and a through hole (15) is provided on the adjacent surfaces.

3. The two-stage dust removal and desulfurization composite device according to claim 1 is characterized in that: A heat-insulating layer (6) is provided on the surface of the dust removal cylinder and the desulfurization cylinder.

4. The two-stage dust removal and desulfurization composite device according to claim 1 is characterized in that: The cyclone guide vane I (5) and the cyclone guide vane II (14) are spiral-shaped.

5. The two-stage dust removal and desulfurization composite device according to claim 1 is characterized in that: A fluidizing valve (16) is provided on the side wall of the silo pump (10) through a pipeline, and the fluidizing valve (16) is connected to the nitrogen pipeline (9); a delivery valve II (18) is provided on the nitrogen pipeline (9) between the delivery valve I (17) and the spray gun (13).

6. The two-stage dust removal and desulfurization composite device according to claim 1 is characterized in that: A feeding bin (11) is provided on the nitrogen pipeline (9) between the bin pump (10) and the delivery valve II (18) via a feeding valve (20).

7. The two-stage dust removal and desulfurization composite device according to claim 1 is characterized in that: The nitrogen pipeline (9) is connected to the waste bin via a delivery valve III (19).

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