Dust removal system of boiler induced draft fan

Abstract

A dust removal system of a boiler induced draft fan belongs to the technical field of environmental protection and comprises an induced draft fan, a smoke barrier, a primary spraying device, a secondary spraying device, a boiler chimney, an air floatation tank, a centrifugal pump, a sedimentation tank, a submersible pump and a grating. The settling pond is located underground, a smoke inlet of the induced draft fan is communicated with a boiler chimney, a smoke outlet of the induced draft fan is communicated with the space above the settling pond, a smoke baffle is arranged at the smoke outlet of the induced draft fan, and a primary spraying device is arranged above the smoke outlet and the smoke baffle; a tank is arranged above the sedimentation tank; the tank is communicated with a boiler chimney, a submersible pump is arranged in the sedimentation tank and is communicated with the adjusting tank through a pipeline, and the air floatation tank is communicated with the primary spraying device and the secondary spraying device through a centrifugal pump and a pipeline. According to the utility model, the supernate of the air floatation tank is used for supplying water for water film dust removal, and the water source is reutilized, so that the water source consumption is reduced, and the production cost is reduced. By adopting a two-time spraying method, the working effect of water film dust removal is enhanced, and the emission meets the environment-friendly requirement.

Description

Technical Field

[0001] This utility model belongs to the field of environmental protection technology, specifically relating to a dust removal system for a boiler induced draft fan. Background Technology

[0002] Steam is required in multiple stages of gelatin production, including ash preparation, gelatin extraction, boiling, evaporation, sterilization, drying, and cleaning. Furthermore, the production of collagen peptides, a byproduct of gelatin production, also relies on steam. Therefore, steam furnaces are crucial in gelatin production. To ensure that steam furnace emissions meet environmental standards, water film dust collection is typically used. However, water film dust collection consumes a significant amount of water. Using tap water or purified water would result in excessive water consumption and increased production costs. Summary of the Invention

[0003] The purpose of this utility model is to solve the problem of water waste caused by the use of tap water film dust removal in existing boilers, and to provide a boiler induced draft fan dust removal system.

[0004] A boiler induced draft fan dust removal system includes an induced draft fan, a smoke baffle, a primary spray device, a secondary spray device, a boiler chimney, a flotation tank, a centrifugal pump, a settling tank, a submersible pump, and a bar screen. The settling tank is located below ground level. The flue gas inlet of the induced draft fan is connected to the boiler chimney, and the flue gas outlet of the induced draft fan opens into the space above the settling tank. A smoke baffle is installed at the flue gas outlet of the induced draft fan, and a primary spray device is installed above the flue gas outlet and the smoke baffle. The settling tank has an opening at the top, and a tank is installed at the opening. The opening above the tank is connected to the boiler chimney. A submersible pump is installed in the vertical shaft of the settling tank, and the submersible pump is connected to an equalization tank through a pipeline. A bar screen is installed in the equalization tank, and the pipeline outlet of the submersible pump is located in front of the bar screen. The flotation tank is connected to the primary and secondary spray devices through a centrifugal pump and pipeline.

[0005] The can is made of fiberglass.

[0006] Spiral nozzles are installed at the outlets of the primary and secondary spraying devices.

[0007] The submersible pump is switched on and off by a float level gauge to maintain a fixed water level in the settling tank.

[0008] The working process of this utility model:

[0009] The induced draft fan transports the flue gas from the boiler chimney to the upper part of the settling tank, where it undergoes initial water film dust removal through a primary spray system and secondary water film dust removal through a secondary spray system above. The flue gas after both dust removal processes is discharged through the boiler chimney, and the dust enters the settling tank. The water used for the primary and secondary spray systems is the supernatant from the flotation tank, which is supplied to the primary and secondary spray systems via centrifugal pumps and pipelines. The flotation tank is located inside the environmental protection workshop, with sludge at the bottom and supernatant at the top.

[0010] The beneficial technical effects of this utility model are as follows:

[0011] Using the supernatant from the flotation tank in the environmental protection workshop as the water supply for water film dust removal not only ensures a sufficient water source and free of foreign matter, but also allows for the secondary use of the water source, reducing water consumption and lowering production costs.

[0012] The water film dust removal method, which involves two spraying stages, reduces the workload of water film dust removal, enhances its effectiveness, and ensures that emissions meet environmental protection requirements. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of the present invention.

[0014] In the diagram: 1-Flue gas inlet; 2-Exhaust fan; 3-Smoke baffle; 4-Primary spray device; 5-Spiral nozzle; 6-Tank; 7-Secondary spray device; 8-Boiler chimney; 9-Air flotation tank; 10-Supernatant; 11-Sludge; 12-Centrifugal pump; 13-Sedimentation tank; 14-Submersible pump; 15-Grate; 16-Equalization tank. Detailed Implementation

[0015] like Figure 1 As shown, a boiler induced draft fan dust removal system includes an induced draft fan 2, a smoke baffle 3, a primary spray device 4, a secondary spray device 7, a boiler chimney 8, an air flotation tank 9, a centrifugal pump 12, a settling tank 13, a submersible pump 14, and a grid 15. The settling tank 13 is located below ground level. The flue gas inlet 1 of the induced draft fan 2 is connected to the boiler chimney 8, and the flue gas outlet of the induced draft fan 2 opens into the space above the settling tank 13. A smoke baffle 3 is installed at the flue gas outlet of the induced draft fan 2, and the flue gas outlet is connected to the baffle 15. A primary spraying device 4 is installed above the flue plate 3; there is an opening above the settling tank 13, and a tank 6 is installed at the opening; the opening above the tank 6 is connected to the boiler flue 8; a submersible pump 14 is installed in the vertical shaft of the settling tank 13; the submersible pump 14 is connected to the equalization tank 16 through a pipeline; a grid 15 is installed in the equalization tank 16; the pipeline outlet of the submersible pump 14 is located in front of the grid 15; the flotation tank 9 is connected to the primary spraying device 4 and the secondary spraying device 7 through a centrifugal pump 12 and a pipeline.

[0016] The tank 6 is made of fiberglass.

[0017] Spiral nozzles 5 are installed at the outlets of the primary spray device 4 and the secondary spray device 7.

[0018] The submersible pump 14 is switched on and off by a float level gauge to maintain a fixed water level in the settling tank 13.

[0019] The working process of this embodiment:

[0020] like Figure 1 As shown, the induced draft fan 2 transports the flue gas from the boiler chimney 8 to the upper part of the settling tank 13, where it undergoes initial water film dust removal through the primary spray device 4, and then undergoes secondary water film dust removal through the secondary spray device 7 above. The flue gas after the two dust removal processes is discharged through the boiler chimney 8, and the dust enters the settling tank 13. The water used for the primary spray device 4 and the secondary spray device 7 is the supernatant 10 in the flotation tank 9, which is supplied to the primary spray device 4 and the secondary spray device 7 through the centrifugal pump 12 and pipelines. The flotation tank 9 is located in the environmental protection workshop, with sludge 11 at the bottom and supernatant 10 at the top.

Claims

1. A dust removal system for a boiler induced draft fan, characterized in that: The system includes an induced draft fan (2), a smoke baffle (3), a primary spray system (4), a secondary spray system (7), a boiler chimney (8), an air flotation tank (9), a centrifugal pump (12), a settling tank (13), a submersible pump (14), and a grid (15). The settling tank (13) is located below ground level. The flue gas inlet (1) of the induced draft fan (2) is connected to the boiler chimney (8), and the flue gas outlet of the induced draft fan (2) is directed into the space above the settling tank (13). A smoke baffle (3) is installed at the flue gas outlet of the induced draft fan (2), and the flue gas outlet is located above the smoke baffle (3). A primary spraying device (4) is provided; there is an opening above the sedimentation tank (13), and a tank (6) is provided at the opening; the opening above the tank (6) is connected to the boiler chimney (8); a submersible pump (14) is provided in the vertical shaft of the sedimentation tank (13); the submersible pump (14) is connected to the regulating tank (16) through a pipeline; a grid (15) is provided in the regulating tank (16); the pipeline outlet of the submersible pump (14) is located in front of the grid (15); the flotation tank (9) is connected to the primary spraying device (4) and the secondary spraying device (7) through a centrifugal pump (12) and a pipeline.

2. The boiler induced draft fan dust removal system according to claim 1, characterized in that: The tank (6) is made of fiberglass.

3. The boiler induced draft fan dust removal system according to claim 1, characterized in that: The submersible pump (14) is switched on and off by a float level gauge.

4. A boiler induced draft fan dust removal system according to claim 1, characterized in that: Spiral nozzles (5) are installed at the outlets of the primary spray device (4) and the secondary spray device (7).

Images