Multistage screening and dust removing device for limestone powder preparation

Abstract

The utility model relates to the technical field of dust removal devices, in particular to a limestone pulverizing multi-stage screening dust removal device which comprises a powder collecting area, the powder collecting area comprises a first-stage powder collecting area, a second-stage powder collecting area and a third-stage powder collecting area which are sequentially arranged from bottom to top, the input end of the first-stage powder collecting area is communicated with an inlet flue, and the output end of the second-stage powder collecting area is communicated with an outlet flue. The output end of the first-stage powder collecting area is communicated with the input end of the second-stage powder collecting area through a first transition section, the output end of the second-stage powder collecting area is communicated with the input end of the third-stage powder collecting area through a second transition section, and the output end of the third-stage powder collecting area is communicated with an outlet flue through a clean flue gas area; pores of filter bags in the first-stage powder collecting area, the second-stage powder collecting area and the third-stage powder collecting area are gradually reduced, the multiple stages of powder collecting areas are arranged to achieve multi-stage screening and deep dust removal of limestone powder behind the pulverizer, the pore diameters of the filter bags in the powder collecting areas are gradually reduced, and deep purification of smoke dust is achieved while limestone powder selection is conducted.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal devices, in particular to a multi-stage screening and dust removal device for limestone powder making. Background Technique

[0002] The limestone powder making process is a technology that grinds limestone raw materials into powder for various practical applications. The limestone powder making process mainly includes three steps: crushing, grinding, and screening. First, the limestone raw materials are crushed by a crushing device into particles of a certain size. Then, the crushed limestone particles enter the grinding device and are repeatedly ground to obtain powder with the required fineness. The ground powder passes through a screening device to remove large particles and impurities that do not meet the requirements, and limestone powder that meets the requirements is obtained.

[0003] The Chinese invention patent with the patent publication number CN110479464B, announced on November 6, 2020, discloses an optimization method for the limestone powder making process. The ground limestone powder is blown up by a blower and classified by a powder separator. The limestone powder that meets the fineness enters the isolation type cyclone powder collector through a pipeline with the air flow for separation and collection; the unqualified particles are separated by the powder separator and thrown towards the cylinder wall, and fall along the cylinder wall and then return to the grinding machine for grinding again, but it can only simply screen the limestone powder into qualified and unqualified particles and cannot perform multi-stage screening. Content of the Utility Model

[0004] In view of the above problems, the utility model provides a multi-stage screening and dust removal device for limestone powder making, which sets up multi-stage powder collection areas to realize multi-stage screening and deep dust removal of limestone powder after the grinding machine. The pore diameters of the filter bags in the powder collection areas gradually decrease, realizing deep purification of the soot while screening the limestone.

[0005] To achieve the above object, the utility model provides the following technical solutions:

[0006] A multi-stage screening and dust removal device for limestone powder making includes a powder collection area, which includes a first-stage powder collection area, a second-stage powder collection area, and a third-stage powder collection area arranged in sequence from bottom to top. The input end of the first-stage powder collection area is connected to the inlet flue, the output end of the first-stage powder collection area is connected to the input end of the second-stage powder collection area through a first transition section, the output end of the second-stage powder collection area is connected to the input end of the third-stage powder collection area through a second transition section, and the output end of the third-stage powder collection area is connected to the outlet flue through a clean flue gas area; the pores of the filter bags in the first-stage powder collection area, the second-stage powder collection area, and the third-stage powder collection area gradually decrease.

[0007] Furthermore, a perforated plate is arranged inside the inlet flue.

[0008] Furthermore, the structures of the first-stage powder collection area, the second-stage powder collection area, and the third-stage powder collection area are the same.

[0009] Furthermore, a plurality of first-stage filter bags are provided on the inner wall of the first-stage powder collection area. The top of the first-stage filter bags is fixed to the first-stage dust cleaning device, and the outer wall of the first-stage dust cleaning device is fixed to the bottom of the inner cavity of the first transition section. A first-stage storage hopper is provided at the bottom of the first-stage powder collection area, and the bottom of the first-stage storage hopper is communicated with the first-stage conveying pipeline.

[0010] Furthermore, the first transition section and the second transition section have the same structure.

[0011] Furthermore, a first flow guiding device is provided inside the first transition section.

[0012] Furthermore, a third flow guiding device is provided inside the clean flue gas area.

[0013] Furthermore, the outer shapes of the first transition section, the second transition section, and the clean flue gas area are all streamlined.

[0014] The utility model has the following beneficial effects:

[0015] 1. The utility model sets up a multi-stage powder collection area to realize the multi-stage screening and deep dust removal of limestone powder after the mill. The pore diameters of the filter bags in the powder collection area gradually decrease, realizing the deep purification of dust while selecting limestone powder.

[0016] 2. The three-stage powder collection area of the utility model is similar to the function of the bag filter in the traditional process. The pore diameters of the filter bags arranged therein are small, and all fine limestone powder can be captured, achieving the purpose of deep purification of dust and preventing limestone powder from being discharged.

[0017] 3. The outer shapes of the transition sections of the utility model are all arranged in a streamlined manner, which can reduce the flue gas resistance, avoid local high wear, and reduce ash accumulation.

[0018] 4. The utility model is provided with a flow guiding device inside the transition section, further improving the uniformity of the flue gas inside the device.

[0019] 5. The multi-stage powder collection areas of the utility model are arranged in a stepped manner from bottom to top, which is consistent with the filtering air flow direction of the filter bags from bottom to top. The overall air flow inside the device is relatively smooth, without corners, and the overall flow resistance is small.

[0020] 6. The inlet flue of the utility model is provided with a perforated plate, which can improve the uniformity of the inlet air flow distribution and avoid large pieces of limestone from entering the filter bag powder collection area and damaging the filter bags.

[0021] 7. When the second-stage filter bags and the third-stage filter bags of the utility model are damaged or the pore diameters are increased, resulting in insufficient filtering accuracy, they can be transformed into first-stage filter bags with large pore diameters, improving the recycling rate of the filter bags and reducing the loss of the filter bags. Description of the Drawings

[0022] Figure 1This is a schematic structural diagram of the present utility model.

[0023] The labels in the attached drawings are as follows:

[0024] 1. Inlet flue; 101. Perforated plate; 2. Primary powder collection area; 201. Primary filter bag; 202. Primary dust cleaning device; 203. Primary storage hopper; 204. Primary conveying pipeline; 3. First transition section; 301. First flow guiding device; 4. Secondary powder collection area; 401. Secondary filter bag; 402. Secondary dust cleaning device; 403. Secondary storage hopper; 404. Secondary conveying pipeline; 5. Second transition section; 501. Second flow guiding device; 6. Tertiary powder collection area; 601. Tertiary filter bag; 602. Tertiary dust cleaning device; 603. Tertiary storage hopper; 604. Tertiary conveying pipeline; 7. Clean flue gas area; 701. Third flow guiding device; 8. Outlet flue. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present utility model.

[0026] As Figure 1 shown, the multi-stage screening and dust removal device for limestone powder making in this embodiment includes a powder collection area, and the powder collection area includes a primary powder collection area 2, a secondary powder collection area 4, and a tertiary powder collection area 6 arranged in sequence from bottom to top. The input end of the primary powder collection area 2 is connected to the inlet flue 1, the output end of the primary powder collection area 2 is connected to the input end of the secondary powder collection area 4 through the first transition section 3, the output end of the secondary powder collection area 4 is connected to the input end of the tertiary powder collection area 6 through the second transition section 5, and the output end of the tertiary powder collection area 6 is connected to the outlet flue 8 through the clean flue gas area 7; the pore sizes of the filter bags in the primary powder collection area 2, the secondary powder collection area 4, and the tertiary powder collection area 6 gradually decrease.

[0027] The dust after the pulverizer enters the multi-stage screening and dust removal device for limestone powder making through the inlet flue 1. The limestone powder first enters the primary powder collection area 2, and the limestone powder coming out of the primary powder collection area 2 enters the secondary powder collection area 4 through the first transition section 3; the limestone powder coming out of the secondary powder collection area 4 enters the tertiary powder collection area 6 through the second transition section 5; the purified flue gas is discharged from the outlet flue 8 through the clean flue gas area 7.

[0028] Furthermore, a perforated plate 101 is arranged inside the inlet flue 1.

[0029] The perforated plate 101 can improve the uniformity of the gas flow distribution of the inlet dust and can intercept large pieces of limestone at the same time.

[0030] Furthermore, the structures of the primary powder collection area 2, the secondary powder collection area 4, and the tertiary powder collection area 6 are the same.

[0031] The powder collection areas at all levels are arranged in a stepped manner from bottom to top, which is consistent with the upward filtration air flow direction of the filter bags. The overall air flow inside the device is relatively smooth, without corners, and the overall flow resistance is small. When the secondary filter bags 401 and the tertiary filter bags 601 are damaged or the pore diameters are increased, resulting in insufficient filtration accuracy, they can be transformed into primary filter bags 201 with large pore diameters, improving the recycling rate of the filter bags and reducing the loss of the filter bags.

[0032] Furthermore, a plurality of primary filter bags 201 are arranged on the inner wall of the primary powder collection area 2. The tops of the primary filter bags 201 are fixed to the primary dust cleaning device 202, and the outer wall of the primary dust cleaning device 202 is fixed to the bottom of the inner cavity of the first transition section 3. A primary storage hopper 203 is arranged at the bottom of the primary powder collection area 2, and the bottom of the primary storage hopper 203 is connected to the primary conveying pipeline 204.

[0033] The pore diameter of the first-stage filter bags 201 is the largest. Coarse particles are first intercepted by the first-stage filter bags 201 and fall into the first-stage storage hopper 203. The remaining limestone powder can pass through the first-stage filter bags 201. The limestone powder adsorbed on the surface of the first-stage filter bags 201 is blown into the first-stage storage hopper 203 by the primary dust cleaning device 202. The limestone powder in the first-stage storage hopper 203 is conveyed back to the grinding mill by the primary conveying pipeline 204 for re-grinding or directly utilized. The pore diameter of the second-stage filter bags 401 is medium-sized. Medium particles are intercepted by the second-stage filter bags 401 and fall into the second-stage storage hopper 403. The remaining limestone powder can pass through the second-stage filter bags 401. The limestone powder adsorbed on the surface of the second-stage filter bags 401 is blown into the second-stage storage hopper 403 by the secondary dust cleaning device 402. The limestone powder in the second-stage storage hopper 403 is conveyed to the storage area by the secondary conveying pipeline 404. The pore diameter of the third-stage filter bags 601 is the smallest. All fine particles are intercepted by the third-stage filter bags 601 and fall into the third-stage storage hopper 603. Micro-fine limestone powder is not allowed to pass through the third-stage filter bags 601. The limestone powder adsorbed on the surface of the third-stage filter bags 601 is blown into the third-stage storage hopper 603 by the tertiary dust cleaning device 602. The limestone powder in the third-stage storage hopper 603 is conveyed to the storage area by the tertiary conveying pipeline 604.

[0034] Furthermore, the structures of the first transition section 3 and the second transition section 5 are the same.

[0035] Furthermore, a first flow guiding device 301 is arranged inside the first transition section 3.

[0036] The first flow guiding device 301 can further improve the uniformity of the flue gas inside the device.

[0037] Furthermore, a third flow guiding device 701 is arranged inside the clean flue gas area 7.

[0038] Furthermore, the outer shapes of the first transition section 3, the second transition section 5, and the clean flue gas area 7 are all streamlined.

[0039] The outer shape of the first transition section 3 is arranged in a streamline shape, which can reduce the flue gas resistance, avoid local high wear, and reduce ash accumulation.

[0040] The usage method of the present utility model is as follows:

[0041] The dust after the pulverizer enters the limestone powder multi-stage screening and dust removal device through the inlet flue 1. The limestone powder first enters the first powder collection area 2. The aperture of the first-stage filter bag 201 is the largest. The coarse particles are first intercepted by the first-stage filter bag 201 and fall into the first-stage storage hopper 203. The remaining limestone powder can pass through the first-stage filter bag 201. The limestone powder adsorbed on the surface of the first-stage filter bag 201 is blown by the first-stage dust cleaning device 202 and falls into the first-stage storage hopper 203. The limestone powder in the first-stage storage hopper 203 is transported back to the pulverizer by the first-stage conveying pipeline 204 for re-grinding or directly utilized; the limestone powder coming out of the first powder collection area 2 enters the second powder collection area 4 through the first transition section 3; the aperture of the second-stage filter bag 401 is of medium size. The medium particles are intercepted by the second-stage filter bag 401 and fall into the second-stage storage hopper 403. The remaining limestone powder can pass through the second-stage filter bag 401. The limestone powder adsorbed on the surface of the second-stage filter bag 401 is blown by the second-stage dust cleaning device 402 and falls into the second-stage storage hopper 403. The limestone powder in the second-stage storage hopper 403 is transported to the storage place by the second-stage conveying pipeline 404; the limestone powder coming out of the second powder collection area 4 enters the third powder collection area 6 through the second transition section 5; the aperture of the third-stage filter bag 601 is the smallest. All fine particles are intercepted by the third-stage filter bag 601 and fall into the third-stage storage hopper 603. The fine limestone powder is not allowed to pass through the third-stage filter bag 601. The limestone powder adsorbed on the surface of the third-stage filter bag 601 is blown by the third-stage dust cleaning device 602 and falls into the third-stage storage hopper 603. The limestone powder in the third-stage storage hopper 603 is transported to the storage place by the third-stage conveying pipeline 604; the purified flue gas is discharged from the outlet flue 8 through the clean flue gas area 7.

[0042] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-stage screening and dust removal device for limestone powder making, comprising a powder collecting area, characterized in that: The powder collecting area comprises a primary powder collecting area (2), a secondary powder collecting area (4) and a tertiary powder collecting area (6) which are arranged in sequence from bottom to top. The input end of the primary powder collecting area (2) is connected to the inlet flue (1), the output end of the primary powder collecting area (2) is connected to the input end of the secondary powder collecting area (4) through a first transition section (3), the output end of the secondary powder collecting area (4) is connected to the input end of the tertiary powder collecting area (6) through a second transition section (5), and the output end of the tertiary powder collecting area (6) is connected to the outlet flue (8) through a clean flue gas area (7); the pores of the filter bags in the primary powder collecting area (2), the secondary powder collecting area (4) and the tertiary powder collecting area (6) are gradually reduced.

2. A limestone powder making multi-stage screening and dust removal device according to claim 1, characterized in that: A porous plate (101) is arranged inside the inlet flue (1).

3. A limestone powder making multi-stage screening and dust removal device according to claim 1, characterized in that: The structures of the primary powder collecting area (2), the secondary powder collecting area (4) and the tertiary powder collecting area (6) are all the same.

4. A limestone powder making multi-stage screening and dust removal device according to claim 3, characterized in that: A plurality of primary filter bags (201) are arranged on the inner wall of the primary powder collecting area (2); the top of the primary filter bag (201) is fixed to the primary dust cleaning device (202); the outer wall of the primary dust cleaning device (202) is fixed to the bottom of the inner cavity of the first transition section (3); a primary storage hopper (203) is arranged at the bottom of the primary powder collecting area (2); the bottom of the primary storage hopper (203) is connected to the primary conveying pipeline (204).

5. A limestone powder making multi-stage screening and dust removal device according to claim 1, characterized in that: The first transition section (3) and the second transition section (5) have the same structure.

6. A limestone powder making multi-stage screening and dust removal device according to claim 5, characterized in that: A first flow guiding device (301) is arranged inside the first transition section (3).

7. A limestone powder making multi-stage screening and dust removal device according to claim 1, characterized in that: A third flow guide device (701) is provided inside the clean flue gas zone (7).

8. A limestone powder making multi-stage screening and dust removal device according to claim 1, characterized in that: The first transition section (3), the second transition section (5) and the clean flue gas zone (7) are all streamlined in appearance.

Images