Multifunctional waste incineration flue gas purification device

Abstract

The utility model discloses a multifunctional waste incineration flue gas purification device, which belongs to the technical field of environmental protection and comprises a flue gas purification box, a flue gas inlet main pipe, a dry powder pipeline, a compressed air pipeline and a flue gas outlet pipeline. The interior of the flue gas purification box is sequentially divided into a first-stage filter box body, a second-stage filter box body and a gas purification box body by filter cloth from left to right; the flue gas inlet branch pipe is connected with the activated carbon injection pipeline; the secondary filtering box body and the air purifying box body are respectively connected with a compressed air back-blowing branch pipe; the secondary filtering box body is connected with a dry powder spraying branch pipe; and the top of the gas purification box body is connected with a flue gas outlet pipeline through a flue gas outlet branch pipe. According to the mode, a multi-unit combined type and two-stage single-layer filter cloth filtering mode is adopted, heavy metal and smoke particulate matter removal and dry-process deacidification are separately arranged, the fly ash generation amount is greatly reduced, and therefore the treatment cost of fly ash serving as hazardous waste is reduced; the purification requirements of different quantities of flue gas can be met by increasing or decreasing the number of the units connected in parallel.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to a multifunctional garbage incineration flue gas purification device. Background Art

[0002] Municipal solid waste incineration is currently the primary method of domestic waste disposal in China. To prevent secondary pollution and environmental impacts, flue gas purification requirements are becoming increasingly stringent. This process typically involves using bag filters to intercept particulate matter, injecting activated carbon to remove heavy metals, and injecting alkaline dry powder to remove acidic gases, ultimately removing heavy metals, acidic gases, and particulate matter from the flue gas.

[0003] Chinese patent CN214809730U discloses a waste incineration flue gas purification system, which includes a waste incinerator, a dry deacidification tower, a dust collector, a wet deacidification tower, a heat exchange device and a flue gas exhaust device; the flue gas purification system includes an activated carbon adsorption tower; the heat exchange device includes a waste heat boiler heating surface, a waste heat boiler economizer and a flue gas heat exchanger; the purification system achieves the function of purifying the flue gas through the cooperation of various devices, but the purification system occupies a large area, has a high disposal cost, and the by-products are difficult to recycle.

[0004] Based on this, the utility model designs a multifunctional garbage incineration flue gas purification device to solve the above problems. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the utility model provides a multifunctional garbage incineration flue gas purification device.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A multifunctional waste incineration flue gas purification device, comprising a flue gas purification box, a flue gas inlet pipe, a dry powder pipe, a compressed air pipe and a flue gas outlet pipe;

[0008] Two filter cloth fixing brackets are arranged in the flue gas purification box at intervals, and a filter cloth is fixedly installed on each filter cloth fixing bracket;

[0009] The interior of the flue gas purification box is divided into a primary filter box, a secondary filter box and a clean air box from left to right by filter cloth;

[0010] The top of the first-stage filter box is connected to the flue gas intake main pipe through the flue gas intake branch pipe. The first-stage filter box is equipped with a filter cloth anti-blocking mechanism driven by the wind power of the flue gas flowing into the first-stage filter box.

[0011] The flue gas inlet branch pipe is connected to the activated carbon injection pipe;

[0012] The secondary filter box and the clean air box are respectively connected to the compressed air pipeline through the compressed air backflush branch pipe, and the compressed air backflush branch pipe is used to backflush and clean the filter cloth on the left side;

[0013] The secondary filter box is connected to the dry powder pipeline through the dry powder injection branch pipe;

[0014] The top of the clean air box is connected to the flue gas outlet pipe through a flue gas outlet branch pipe.

[0015] Furthermore, a first-stage filter box body is provided with a first-stage box body ash hopper at the bottom thereof, and a fly ash outlet for discharging flue gas particulates and activated carbon is provided at the bottom thereof.

[0016] Furthermore, a secondary filtration box body is provided with a secondary box ash hopper at the bottom, and a salt recovery outlet is provided at the bottom of the secondary box ash hopper for discharging the substances after the dry powder and the primary filtered flue gas are mixed and reacted.

[0017] Furthermore, a plurality of compressed air nozzles are evenly spaced on the compressed air diversion pipe along the height direction of the flue gas purification box and are directed toward the filter cloth on the left side thereof, so that the compressed air nozzles are arranged in a matrix.

[0018] Furthermore, a plurality of dry powder diversion pipes extending into the secondary filter box and connected to the dry powder injection branch pipe are provided at equal intervals on the dry powder injection branch pipe along the width direction of the flue gas purification box, and a plurality of dry powder nozzles facing away from the filter cloth on the left side of the dry powder diversion pipe are evenly provided at equal intervals along the height direction of the flue gas purification box, so that the dry powder nozzles are arranged in a matrix.

[0019] Furthermore, the dry powder in the dry powder pipeline is alkaline dry powder.

[0020] Furthermore, each flue gas purification box is a unit, and the flue gas purification device is composed of multiple units in parallel. The flue gas in the flue gas inlet main pipe flows into each flue gas purification box through the flue gas inlet branch pipe for purification, and flows back to the flue gas outlet pipe through the flue gas outlet branch pipe for discharge.

[0021] Furthermore, the filter cloth anti-blocking mechanism includes a fan, a fan bracket, a knocking rod and a rotating shaft. One end of the fan bracket is fixedly connected to the inner wall of the first-stage filter box, and the other end of the fan bracket is rotatably installed with the rotating shaft through a bearing; the upper end of the rotating shaft is fixedly installed with a fan, and the fan faces the outlet end of the flue gas inlet branch pipe. The lower end of the rotating shaft is fixedly installed with multiple knocking rods in a circular array, and the end of the knocking rod away from the rotating shaft is provided with a knocking head for knocking the skeleton of the filter cloth fixing bracket.

[0022] Compared with the existing technology, the utility model has the following beneficial effects: 1. It adopts a multi-unit combination type and a two-stage single-layer filter cloth filtration method for each unit, which separates the removal of heavy metals and smoke particles and the dry deacidification, greatly reducing the amount of fly ash generated, thereby reducing the disposal cost of fly ash as hazardous waste, and can adapt to different flue gas purification needs by increasing or decreasing the number of units in parallel;

[0023] 2. At the same time, it can realize intensive layout and avoid multi-stage bag dust collector occupying too much space;

[0024] 3. The mixture of calcium chloride and calcium hydroxide (or sodium chloride and sodium hydroxide) produced by deacidification can be used as an industrial raw material to improve the resource utilization rate of by-products in the flue gas purification process, which has a significant effect on energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0026] Figure 1 This is a top view of a multifunctional waste incineration flue gas purification device of the present utility model;

[0027] Figure 2 This is a top view of the flue gas purification unit of the present invention;

[0028] Figure 3 This is a front cross-sectional view of the flue gas purification unit of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the filter cloth anti-blocking mechanism of the present invention.

[0030] The numbers in the figure represent:

[0031] 1. Flue gas purification box; 11. Primary filter box; 111. Primary box ash hopper; 112. Fly ash outlet; 12. Secondary filter box; 121. Secondary box ash hopper; 122. Recovered salt outlet; 13. Clean air box; 20. Filter cloth; 21. Filter cloth fixing bracket; 3. Flue gas inlet main pipe; 31. Flue gas inlet branch pipe; 4. Dry powder pipe; 41. Dry powder injection branch pipe; 42. Dry powder diverter pipe; 43. Dry powder nozzle; 5. Compressed air pipe; 51. Compressed air backflush branch pipe; 52. Compressed air diverter pipe; 53. Compressed air nozzle; 6. Flue gas outlet pipe; 61. Flue gas outlet branch pipe; 7. Activated carbon injection pipe; 8. Filter cloth anti-blocking mechanism; 81. Fan; 82. Fan bracket; 83. Knocking rod; 84. Rotating shaft. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] Example 1: In some embodiments, please refer to the accompanying drawings of the specification. Figure 1-Figure 3 A multifunctional waste incineration flue gas purification device includes a flue gas purification box 1, a flue gas inlet pipe 3, a dry powder pipe 4, a compressed air pipe 5 and a flue gas outlet pipe 6;

[0034] Two filter cloth fixing brackets 21 are provided in the flue gas purification box 1, and a filter cloth 20 is fixedly mounted on each filter cloth fixing bracket 21;

[0035] Specifically, the skeleton of the filter cloth fixing bracket 21 can be composed of multiple metal rods crisscrossed, the filter cloth 20 is stretched on the filter cloth fixing bracket 21, and both sides of the filter cloth 20 are fixed on the filter cloth fixing bracket 21, thereby providing a stable supporting and fixing effect on the filter cloth 20.

[0036] The interior of the flue gas purification box 1 is divided into a primary filter box 11, a secondary filter box 12 and a clean air box 13 from left to right by the filter cloth 20; the flue gas in the primary filter box 11 is filtered by the filter cloth 20 and then enters the secondary filter box 12 to form the primary filtered gas, and the flue gas in the secondary filter box 12 is filtered by the filter cloth 20 and then enters the clean air box 13 to form the secondary filtered gas;

[0037] The top of the primary filter box 11 is connected to the flue gas intake main 3 via a flue gas intake branch pipe 31. The primary filter box 11 is provided with a filter cloth anti-blocking mechanism 8 driven by the wind of the flue gas flowing into the primary filter box 11. The bottom of the primary filter box 11 is provided with a primary box ash hopper 111. The bottom of the primary box ash hopper 111 is provided with a fly ash outlet 112 connected to the outside.

[0038] The flue gas inlet branch pipe 31 is connected to the activated carbon injection pipe 7. The flue gas and activated carbon are mixed in the pipe to absorb heavy metals in the flue gas. The mixed flue gas then enters the primary filter box 11. The flue gas particles and activated carbon are intercepted by the filter cloth 20, fall into the primary box ash hopper 111 and are discharged from the primary filter box 11 through the fly ash outlet 112.

[0039] The secondary filter box 12 and the clean air box 13 are respectively connected to the compressed air pipe 5 through a compressed air backflush branch pipe 51. Both compressed air backflush branches 51 are provided with multiple compressed air diversion pipes 52 connected to the compressed air backflush branch pipes 51 at equal intervals along the width direction of the flue gas purification box 1 and extend into the secondary filter box 12 and the clean air box 13 respectively; the compressed air diversion pipe 52 is evenly spaced along the height direction of the flue gas purification box 1 and has multiple compressed air nozzles 53 facing the filter cloth 20 on its left side, so that the compressed air nozzles 53 form a matrix arrangement; when the compressed air in the compressed air pipe 5 is ejected through the compressed air nozzle 53, the compressed air will be evenly applied to the surface of the filter cloth 20, thereby increasing the recoil effect on the filter cloth 20, so that the accumulation blocked in the gaps of the filter cloth 20 is effectively cleaned.

[0040] The secondary filter box 12 is connected to the dry powder pipeline 4 through a dry powder injection branch pipe 41. A plurality of dry powder diversion pipes 42 extending into the secondary filter box 12 and connected to the dry powder injection branch pipe 41 are provided on the dry powder injection branch pipe 41 at equal intervals along the width direction of the flue gas purification box 1. A plurality of dry powder nozzles 43 facing away from the filter cloth 20 on its left side are evenly spaced on the dry powder diversion pipe 42 at equal intervals along the height direction of the flue gas purification box 1, so that the dry powder nozzles 43 are arranged in a matrix; thereby, the dry powder injected into the secondary filter box 12 can be evenly mixed with the primary filtered gas.

[0041] A secondary ash hopper 121 is provided at the lower end of the secondary filtration box 12, and a salt recovery outlet 122 communicating with the outside is provided at the bottom of the secondary ash hopper 121;

[0042] Specifically, the dry powder in the dry powder pipe 4 is an alkaline dry powder, such as calcium hydroxide or sodium hydroxide, which is mixed and reacted with the primary filtered flue gas in the secondary filter box 12, intercepted by the filter cloth 20, and falls into the secondary box ash hopper 121 and is discharged from the secondary filter box 12 through the recovered salt outlet 122.

[0043] The top of the clean air box 13 is connected to the smoke outlet pipe 6 through the smoke outlet branch pipe 61 , and the secondary filtered gas is discharged from the clean air box 13 through the smoke outlet branch pipe 61 .

[0044] Specifically, each flue gas purification box 1 is a unit, and the flue gas purification device is composed of multiple units connected in parallel. The flue gas in the flue gas inlet main pipe 3 flows into each flue gas purification box 1 through the flue gas inlet branch pipe 31 for purification, and flows back to the flue gas outlet pipe 6 through the flue gas outlet branch pipe 61 for discharge. Through the coordinated cooperation of multiple units, the flue gas purification effect is effectively improved, and the number of parallel units can be increased or decreased to adapt to different amounts of flue gas purification needs.

[0045] In the utility model, a multi-unit combination and two-stage single-layer filter cloth filtration in each unit are adopted to separate the removal of heavy metals and smoke particles and dry deacidification, which greatly reduces the amount of fly ash generated, thereby reducing the disposal cost of fly ash as hazardous waste; at the same time, intensive layout can be achieved to avoid the multi-stage bag dust collector from occupying too much space; the calcium chloride and calcium hydroxide or the mixture of sodium chloride and sodium hydroxide produced by deacidification can be used as industrial raw materials, thereby improving the resource utilization rate of by-products in the flue gas purification process, and has a significant effect on energy conservation and emission reduction.

[0046] Embodiment 2: In some embodiments, as Figure 3 and Figure 4 As shown, as a preferred embodiment of the present invention, the filter cloth anti-blocking mechanism 8 includes a fan 81, a fan bracket 82, a knocking rod 83 and a rotating shaft 84, one end of the fan bracket 82 is fixedly connected to the inner wall of the primary filter box 11, and the other end of the fan bracket 82 is rotatably mounted on the rotating shaft 84 through a bearing; the upper end of the rotating shaft 84 is fixedly mounted with the fan 81, and the fan 81 faces the outlet end of the smoke inlet branch pipe 31, so that the airflow entering the primary filter box 11 from the smoke inlet branch pipe 31 can drive the fan 81 to rotate; the lower end of the rotating shaft 84 is fixedly mounted with a plurality of knocking rods 83 in a circumferential array, the knocking rod 83 is set as a telescopic rod, and the end of the knocking rod 83 away from the rotating shaft 84 is provided with a knocking head for knocking the skeleton of the filter cloth fixing bracket 21;

[0047] The filter cloth 20 on the right side of the primary filter box 11 is mainly used to intercept flue gas particulate matter and activated carbon. Accumulations are easily attached to the surface of the filter cloth 20. The filter cloth 20 needs to be frequently backflushed with compressed air to maintain the filtering effect of the filter cloth 20, which consumes a lot of energy and has a poor cleaning effect on the filter cloth 20; and when the fan bracket 82 rotates, it will drive the knocking rod 83 to rotate synchronously, and continuously knock the filter cloth fixing bracket 21 frame to vibrate the filter cloth fixing bracket 21, so that the filter cloth 20 on the filter cloth fixing bracket 21 vibrates, and the accumulation on the surface of the filter cloth 20 is shaken off, so that the filter cloth 20 always maintains a good filtering effect, and reduces the backflushing frequency to reduce energy consumption.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multifunctional waste incineration flue gas purification device, comprising a flue gas purification box (1), a flue gas inlet pipe (3), a dry powder pipe (4), a compressed air pipe (5) and a flue gas outlet pipe (6), characterized in that: Two filter cloth fixing brackets (21) are arranged at intervals in the flue gas purification box (1), and a filter cloth (20) is fixedly mounted on each filter cloth fixing bracket (21); The interior of the flue gas purification box (1) is divided into a primary filter box (11), a secondary filter box (12) and a clean air box (13) from left to right by a filter cloth (20); The top of the first-stage filter box (11) is connected to the smoke inlet main pipe (3) via a smoke inlet branch pipe (31), and a filter cloth anti-blocking mechanism (8) driven by wind power of smoke flowing into the first-stage filter box (11) is provided in the first-stage filter box (11); The flue gas inlet branch pipe (31) is connected to the activated carbon injection pipe (7); The secondary filter box (12) and the clean air box (13) are respectively connected to the compressed air pipeline (5) through a compressed air backflush branch (51), and the compressed air backflush branch (51) is used to backflush and clean the left filter cloth (20); The secondary filter box (12) is connected to the dry powder pipeline (4) via the dry powder injection branch pipe (41); The top of the clean air box (13) is connected to the smoke outlet pipe (6) via a smoke outlet branch pipe (61).

2. The multifunctional waste incineration flue gas purification device according to claim 1 is characterized in that: A first-stage filter box (11) is provided at the bottom thereof with a first-stage box ash hopper (111), and a fly ash outlet (112) for discharging flue gas particles and activated carbon is provided at the bottom thereof.

3. The multifunctional waste incineration flue gas purification device according to claim 2 is characterized in that: A secondary ash hopper (121) is provided at the bottom of the secondary filter box (12), and a salt recovery outlet (122) is provided at the bottom of the secondary ash hopper (121) for discharging the substance after the dry powder and the primary filtered flue gas are mixed and reacted.

4. The multifunctional waste incineration flue gas purification device according to claim 3 is characterized in that: A plurality of compressed air nozzles (53) are evenly spaced and arranged on the compressed air diversion pipe (52) along the height direction of the flue gas purification box (1) toward the filter cloth (20) on the left side thereof, so that the compressed air nozzles (53) are arranged in a matrix.

5. The multifunctional waste incineration flue gas purification device according to claim 4 is characterized in that: A plurality of dry powder shunt pipes (42) extending into the secondary filter box (12) and communicating with the dry powder injection branch pipe (41) are provided on the dry powder injection branch pipe (41) at equal intervals along the width direction of the flue gas purification box (1). A plurality of dry powder nozzles (43) facing away from the filter cloth (20) on the left side of the dry powder shunt pipe (42) are evenly provided at equal intervals along the height direction of the flue gas purification box (1), so that the dry powder nozzles (43) are arranged in a matrix.

6. The multifunctional waste incineration flue gas purification device according to claim 5, characterized in that: The dry powder in the dry powder pipeline (4) is alkaline dry powder.

7. The multifunctional waste incineration flue gas purification device according to claim 6, characterized in that: Each flue gas purification box (1) is a unit. The flue gas purification device is composed of a plurality of units connected in parallel. The flue gas in the flue gas inlet main pipe (3) flows into each flue gas purification box (1) through the flue gas inlet branch pipe (31) for purification, and flows back through the flue gas outlet branch pipe (61) to the flue gas outlet pipe (6) for discharge.

8. The multifunctional waste incineration flue gas purification device according to claim 7, characterized in that: The filter cloth anti-blocking mechanism (8) comprises a fan (81), a fan bracket (82), a knocking rod (83) and a rotating shaft (84). One end of the fan bracket (82) is fixedly connected to the inner wall of the primary filter box (11), and the other end of the fan bracket (82) is rotatably mounted with the rotating shaft (84) through a bearing; the upper end of the rotating shaft (84) is fixedly mounted with the fan (81), and the fan (81) faces the outlet end of the smoke inlet branch pipe (31); the lower end of the rotating shaft (84) is fixedly mounted with a plurality of knocking rods (83) in a circumferential array, and the end of the knocking rod (83) away from the rotating shaft (84) is provided with a knocking head for knocking the skeleton of the filter cloth fixing bracket (21).

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