Combined flue gas purification device

Abstract

The utility model discloses a combined flue gas purification device which comprises a double-channel filtering structure arranged at one end of a flue gas exhaust pipeline of a coal-fired boiler, a negative-pressure axial flow fan is installed at the exhaust end of the double-channel filtering structure, and the air outlet end of the negative-pressure axial flow fan is connected with a bag-type dust collector. The utility model relates to the technical field of flue gas purification, the switching between two channels is realized by using the stop valves on the Y-shaped gas inlet pipeline and the Y-shaped gas outlet pipeline in the two-channel filtering structure, one channel is standby and the other channel is used, and the filtered flue gas is further driven by the negative pressure fan to enter the bag-type dust collector to be finely filtered, so that the quality of the flue gas is improved. The gas subjected to fine filtration further enters the desulfurization spray tower to realize flue gas purification, and when the standby passage is in a standby state, the probing type cleaning assembly at the top of the group of filter bins is started, and the probing type cleaning assembly is utilized to realize reverse unblocking operation on the filter screen plate.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas purification, in particular to a combined flue gas purification device. Background Art

[0002] Coal-fired industrial boilers generate a large amount of flue gas during use. The flue gas contains pollutants such as dust and sulfides, which are directly discharged into the environment, easily causing environmental pollution. Therefore, the flue gas needs to be purified. In the existing technology, when the coal-fired boiler flue gas purification device is in use, the dust and other particles contained in the flue gas will cause blockage to the filter plate, thereby affecting the normal circulation of the flue gas. If a large-aperture filter plate is used, the interception and purification effect of the particulate dust will be reduced, which is not practical enough. At the same time, it will have an adverse effect on the subsequent deep purification of the flue gas and may even cause the bag dust removal system to be paralyzed. In view of this, in-depth research on the above-mentioned problems has led to the emergence of this case. Utility Model Content

[0003] In view of the deficiencies of the prior art, the present invention provides a combined flue gas purification device, which solves the problems raised in the background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a combined flue gas purification device, comprising a dual-channel filter structure provided at one end of the exhaust pipe of a coal-fired boiler, a negative pressure axial flow fan being installed at the exhaust end of the dual-channel filter structure, the air outlet end of the negative pressure axial flow fan being connected to a bag dust collector, and the air outlet end of the bag dust collector being connected to the air inlet pipe of a desulfurization spray tower;

[0005] The dual-channel filtration structure includes a Y-shaped air intake pipe, a filter bin, a filter screen, a probe-type cleaning component, an ash collecting trough, a sealing door and a Y-shaped exhaust pipe, wherein one end of the Y-shaped air intake pipe is connected to the smoke exhaust pipe, the filter bin is respectively arranged on the two outlet ends of the Y-shaped air intake pipe, the filter screen is installed in the filter bin along an inclined direction, the probe-type cleaning component is arranged on the top of the filter bin and one end extends into the filter bin, the ash collecting trough is arranged below the filter bin, the sealing door is installed at the open position of the lower end of the ash collecting trough, the two inlet ends of the Y-shaped exhaust pipe are respectively connected to the filter bin, and the outlet end of the Y-shaped exhaust pipe is connected to the negative pressure fan;

[0006] Each branch of the Y-shaped air intake pipeline and the Y-shaped exhaust pipeline is provided with a stop valve.

[0007] The above-mentioned probe-type cleaning assembly includes a U-shaped shell, a screw module, a guide rod and a cleaning component. The U-shaped shell is arranged on the top of the filter bin, and a vertical frame is provided on the upper part of the U-shaped shell along the inclined direction. The screw module is installed on the vertical frame and arranged parallel to the filter mesh plate. The upper end of the guide rod is connected to the movable end of the screw module, and the lower end passes through the U-shaped shell and extends into the filter bin. The guide rod is slidably sealed with the upper end surface of the U-shaped shell, and the cleaning component is arranged on the lower end of the guide rod.

[0008] Guide limiters are symmetrically arranged on both sides of the screw module, and one end of the guide limiter is connected to the cleaning component.

[0009] The guide limiter comprises a sliding sealing sleeve and a guide column. The sliding sealing sleeve is arranged on the U-shaped housing. The guide column is inserted into the sliding sealing sleeve and the lower end of the guide column is connected to the cleaning component.

[0010] The cleaning component includes a crossbeam and a hard long-pole brush. The crossbeam is arranged on the lower end of the guide rod, and the hard long-pole brush is installed on the side wall of the crossbeam and is attached to the filter plate.

[0011] A compression spring is installed between the crossbeam and the hard long-rod brush.

[0012] The utility model provides a combined flue gas purification device. It has the following beneficial effects: the combined flue gas purification device is provided with a dual-channel filtering structure at one end of the exhaust pipe of a coal-fired boiler, and the shut-off valves on the Y-shaped air inlet pipe and the Y-shaped air outlet pipe in the dual-channel filtering structure are used to switch between the dual channels, so that one is in standby and the other is in use. The filtered flue gas is further driven by a negative pressure fan to enter a bag dust collector for fine filtration. The finely filtered gas further enters a desulfurization spray tower for flue gas purification. When the standby channel is on standby, a probe cleaning component on the top of the filter bin is activated to reversely clear the filter screen. Large particles of dust that fall down enter the ash collecting trough below under the action of gravity. The dust can be discharged by opening the sealing door. After cleaning, the opening and closing state of the shut-off valve can be adjusted to switch between the channels. The dual-channel switching can be performed under the operating conditions of the coal-fired boiler without shutting down the boiler, thereby greatly ensuring the operational stability of the coal-fired boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the main structure of a combined flue gas purification device described in the present utility model.

[0014] Figure 2 This is a schematic diagram of the main cross-sectional structure of the filter bin described in the present invention.

[0015] Figure 3 This is a schematic top view of the dual-channel filtering structure of the present invention.

[0016] Figure 4 For this utility model Figure 2 Schematic diagram of the locally enlarged structure at position a.

[0017] In the figure: 1. Smoke exhaust duct; 2. Negative pressure axial flow fan; 3. Bag dust collector; 4. Desulfurization spray tower; 5. Y-type air inlet pipe; 6. Filter bin; 7. Filter screen; 8. Ash collection trough; 9. Sealing door; 10. Y-type exhaust pipe; 11. Stop valve; 12. U-shaped shell; 13. Screw module; 14. Guide rod; 15. Sliding sealing sleeve; 16. Guide column; 17. Crossbeam; 18. Hard long-pole brush; 19. Compression spring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example: In conjunction with the instructions attached Figure 1-4It can be seen that the present application specifically designs a combined flue gas purification device, including a dual-channel filtering structure arranged at one end of the coal-fired boiler exhaust pipe 1, the exhaust end of the dual-channel filtering structure is installed with a negative pressure axial flow fan 2, the air outlet end of the negative pressure axial flow fan 2 is connected to the bag dust collector 3, and the air outlet end of the bag dust collector 3 is connected to the air inlet pipe of the desulfurization spray tower 4; wherein the dual-channel filtering structure includes a Y-shaped air inlet pipe 5, a filter bin 6, a filter screen 7, an exploratory cleaning component, an ash collecting trough 8, a sealing door 9 and a Y-shaped exhaust Pipeline 10, one end of the Y-shaped air intake pipe 5 is connected to the smoke exhaust pipe 1, the filter chamber 6 is respectively arranged on the two outlet ends of the Y-shaped air intake pipe 5, the filter screen plate 7 is installed in the filter chamber 6 along the inclined direction, the probe cleaning component is arranged on the top of the filter chamber 6 and one end extends into the filter chamber 6, the ash collecting tank 8 is arranged below the filter chamber 6, and the sealing door 9 is installed at the lower end opening position of the ash collecting tank 8. The two inlet ends of the Y-shaped exhaust pipe 10 are respectively connected to the filter chamber 6, and the outlet end of the Y-shaped exhaust pipe 10 is connected to the negative pressure fan. The Y-shaped air inlet pipe 5 and each branch of the Y-shaped exhaust pipe 10 are provided with a stop valve 11. A dual-channel filtering structure is provided at one end of the coal-fired boiler exhaust pipe 1. The stop valve 11 on the Y-shaped air inlet pipe 5 and the Y-shaped air outlet pipe in the dual-channel filtering structure is used to realize switching between the dual channels, so as to achieve one standby and one use. The filtered flue gas is further driven by the negative pressure fan to enter the bag dust collector 3 for fine filtration. The gas after fine filtration further enters the desulfurization spray tower 4 to realize flue gas purification. When the standby path is on standby, the probe cleaning component on the top of the filter bin 6 is started, and the probe cleaning component is used to realize the reverse cleaning operation of the filter screen plate 7. The large particles of dust that fall down enter the ash collecting trough 8 below under the action of gravity. The dust can be discharged by opening the sealing door 9. After cleaning, the opening and closing state of the stop valve 11 can be adjusted to realize switching between channels. The dual-channel switching can be carried out under the operating conditions of the coal-fired boiler without stopping the machine, which greatly ensures the stability of the coal-fired boiler operation.

[0020] The filter screen 7 is provided with a U-shaped housing 12, and a guide rod 14 is provided on the upper part of the U-shaped housing 12. The guide rod 14 is connected to the movable end of the guide rod 13 and the lower end thereof passes through the U-shaped housing 12 and extends into the filter screen 6. The guide rod 14 is slidably sealed with the upper end surface of the U-shaped housing 12. The cleaning member is provided on the lower end of the guide rod 14. The guide limiters are symmetrically provided on both sides of the guide rod 13. One end of the guide limiter is connected to the cleaning member. The guide limiter includes a sliding sealing sleeve 15 and a guide column 16. The sliding sealing sleeve 15 is provided on the U-shaped housing 12. The guide column 16 is inserted into the sliding sealing sleeve 15 and the lower end is connected to the cleaning member. The cleaning member includes a crossbeam 17 When the filter screen 7 needs to be cleaned, the current smoke exhaust channel is closed, the screw module 13 is started, and the movable end of the screw module 13 is controlled to move downward, thereby pushing the guide rod 14 downward. At this time, the crossbeam 17 at the lower end of the guide rod 14 moves downward in the inclined direction under the limiting action of the guide columns 16 on both sides, and the long-bar hard brush at the lower part of the crossbeam 17 is inserted into the filter hole on the filter screen 7 under the elastic force of the compression spring 19, thereby pushing the large particle impurities blocked in the hole in the reverse direction, thereby effectively ensuring the stability of the use of the filter screen 7 and improving its service life. The cleaned particles fall into the ash collecting trough 8 under the action of gravity and can be discharged through the sealing door 9.

[0021] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined flue gas purification device, characterized in that: It includes a dual-channel filter structure arranged at one end of the exhaust pipe of a coal-fired boiler, a negative pressure axial flow fan is installed at the exhaust end of the dual-channel filter structure, the air outlet end of the negative pressure axial flow fan is connected to a bag dust collector, and the air outlet end of the bag dust collector is connected to the air inlet pipe of the desulfurization spray tower; The dual-channel filtration structure includes a Y-shaped air intake pipe, a filter bin, a filter screen, a probe-type cleaning component, an ash collecting trough, a sealing door and a Y-shaped exhaust pipe, wherein one end of the Y-shaped air intake pipe is connected to the smoke exhaust pipe, the filter bin is respectively arranged on the two outlet ends of the Y-shaped air intake pipe, the filter screen is installed in the filter bin along an inclined direction, the probe-type cleaning component is arranged on the top of the filter bin and one end extends into the filter bin, the ash collecting trough is arranged below the filter bin, the sealing door is installed at the open position of the lower end of the ash collecting trough, the two inlet ends of the Y-shaped exhaust pipe are respectively connected to the filter bin, and the outlet end of the Y-shaped exhaust pipe is connected to the negative pressure fan; Each branch of the Y-shaped air intake pipeline and the Y-shaped exhaust pipeline is provided with a stop valve.

2. A combined flue gas purification device according to claim 1, characterized in that: The probe cleaning assembly includes a U-shaped shell, a screw module, a guide rod and a cleaning component. The U-shaped shell is arranged on the top of the filter bin. A vertical frame is provided on the upper part of the U-shaped shell along the inclined direction. The screw module is installed on the vertical frame and arranged parallel to the filter screen. The upper end of the guide rod is connected to the movable end of the screw module, and the lower end passes through the U-shaped shell and extends into the filter bin. The guide rod is slidably sealed with the upper end surface of the U-shaped shell, and the cleaning component is arranged on the lower end of the guide rod.

3. A combined flue gas purification device according to claim 2, characterized in that: Guide limiters are symmetrically arranged on both sides of the lead screw module, and one end of the guide limiter is connected to the cleaning component.

4. A combined flue gas purification device according to claim 3, characterized in that: The guide limiter comprises a sliding sealing sleeve and a guide column. The sliding sealing sleeve is arranged on the U-shaped shell. The guide column is inserted into the sliding sealing sleeve and the lower end of the guide column is connected to the cleaning component.

5. The combined flue gas purification device according to claim 2, characterized in that: The cleaning component includes a crossbeam and a hard long-pole brush. The crossbeam is arranged on the lower end of the guide rod, and the hard long-pole brush is installed on the side wall of the crossbeam and is attached to the filter plate.

6. A combined flue gas purification device according to claim 5, characterized in that: A compression spring is installed between the crossbeam and the hard long-rod brush.

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