CN214809370U

CN214809370U - Flue gas filter

Info

Publication number: CN214809370U
Application number: CN202120531186.9U
Authority: CN
Inventors: 胡瑞华
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-11
Filing date: 2021-03-12
Publication date: 2021-11-23
Anticipated expiration: 2031-03-12

Abstract

The utility model discloses a flue gas filter, which comprises at least one filtering unit, wherein each filtering unit comprises a keel bracket and a composite filtering core fixedly positioned in the keel bracket, one end of the keel bracket is an exhaust end, and the other end of the keel bracket is fixedly provided with a bottom cover; the composite filter element is a three-layer structure comprising two metal wire mesh layers and a ceramic fiber layer positioned between the two metal wire mesh layers. Or, the filter comprises at least one filter unit, each filter unit comprises a punching pipe and a first composite filter element sleeved and fixed outside the punching pipe, one end of the punching pipe is an exhaust end, and the other end of the punching pipe is fixedly provided with a first bottom cover; the first composite filter element is of a two-layer structure comprising a metal wire mesh layer and a first ceramic fiber layer positioned on the inner side of the metal wire mesh layer. The filter has the characteristics of high filtering precision, small ventilation resistance, high structural strength, high temperature resistance, corrosion resistance, good thermal shock resistance, no fracture, long service life and reliable operation.

Description

Flue gas filter

Technical Field

The utility model belongs to industry flue gas, dusty gas filtration field, concretely relates to flue gas filter.

Background

In the operation of furnaces and kilns in chemical industry, petroleum industry, metallurgy industry, electric power industry, building materials industry and other industries, a large amount of high-temperature dust-containing nitrogen-containing oxides (NO) are often generated_x) The flue gas pollutes the atmospheric environment and must be treated. In order to achieve the emission reaching the standard, the high-temperature flue gas needs to be filtered and dedusted and Nitric Oxide (NO) needs to be removed_x) And (5) carrying out catalytic reduction treatment.

The ceramic fiber filtering and dust removing technology is one of the filtering technologies which are developed rapidly in recent years. Compared with the traditional granular filter material, the ceramic fiber filter material has larger specific surface area, larger interface adsorption and capability of intercepting suspended matters, and good filtering effect. Compared with foamed ceramic, it has smaller pore size and higher filtering precision. Compared with organic fiber filtration, the ceramic fiber has good thermal stability, chemical stability and thermal shock resistance.

At present, most of existing ceramic fiber filters are cylindrical tube structures, vacuum suction filtration technology is adopted for production, the thickness of the filter wall is 10mm and above, air permeability resistance is large, the bonding strength of ceramic fibers is low, and the phenomenon of tube breakage frequently occurs in the use process, so that the operation of a dust removal system is unreliable. If a composite ceramic fiber filter with larger filtration area per unit volume, thinner filter wall, small air permeability resistance, high strength and fracture resistance can be developed, the filtration performance, the service life and the operation reliability can be improved with no doubt.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects existing in the prior art, the utility model provides a flue gasFilter and can be loaded with Nitrogen Oxides (NO)_x) A catalyst. The filter can be applied to dust filtration and Nitrogen Oxide (NO) of high-temperature flue gas of an industrial furnace_x) Catalytic reduction of (2).

In order to realize the purpose of the utility model, the utility model provides a smoke filter, which comprises at least one filtering unit, each filtering unit comprises a keel bracket and a composite filtering core fixedly positioned in the keel bracket, one end of the keel bracket is an exhaust end, and the other end is fixedly provided with a bottom cover;

the composite filter element is a three-layer structure comprising two metal wire mesh layers and a ceramic fiber layer positioned between the two metal wire mesh layers.

Further, the keel support comprises two connecting rings and a plurality of ribs, the two ends of the plurality of ribs are equally divided and are respectively fixed on the two connecting rings, and the plurality of ribs are distributed along the circumferential direction of the connecting rings.

Further, the keel support further comprises at least one support ring, the support ring is located between the two connecting rings, and the support ring is fixedly connected with each rib.

Furthermore, a nitrogen oxide catalyst layer is loaded on the composite filter element.

Further, the two wire mesh layers in the three-layer structure and the ceramic fiber layer between the two wire mesh layers are bent together along the radial direction of the filter to form a plurality of continuous folds, and the folds are arranged around the axis of the filter in the circumferential direction.

Furthermore, the composite filter element further comprises two sealing plugs which are respectively fixed at two ends of the composite filter element, wherein a wrinkle ring matched with wrinkles on the composite filter element is arranged on the inner ring of each sealing plug, and two ends of the composite filter element are fixedly connected with the keel support through the sealing plugs.

Further, the axial seam of the compound filter element folds is coated with high-temperature glue for sealing the interface; high-temperature glue is coated between the sealing plugs at the two ends of the filter element and the keel support and used for sealing and connecting.

The utility model also provides a flue gas filter, which comprises at least one filtering unit, wherein each filtering unit comprises a punching pipe and a first composite filtering core sleeved and fixed outside the punching pipe, one end of the punching pipe is an exhaust end, and the other end of the punching pipe is fixedly provided with a first bottom cover;

the first composite filter element is of a two-layer structure comprising a metal wire mesh layer and a first ceramic fiber layer positioned on the inner side of the metal wire mesh layer.

Further, the joint of the punching pipe and the first composite filter element is coated with high-temperature glue.

Further, a nitrogen oxide catalyst layer is loaded on the first composite filter element.

Compared with the prior art, the utility model discloses beneficial effect that can realize is at least as follows:

the filter combines the performance advantages of the metal material and the ceramic fiber, so that the filter has the characteristics of high filtering precision, small air permeability resistance, large structural strength, high temperature resistance, corrosion resistance, good thermal shock resistance, no breakage, long service life and reliable operation; at the same time, the surface of the ceramic fiber can be loaded with Nitrogen Oxide (NO)_x) The catalyst is made to have Nitrogen Oxide (NO)_x) The catalytic reduction function of (1). Especially, the filter with the three-layer structure composite filter element has the advantages that the unit volume filter area is large and is 1.5-5 times of that of a tubular filter with the same diameter, so that the filter air volume can be greatly improved, the volume of the dust remover is reduced, and the cost of a dust removal system is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a flue gas filter provided in embodiment 1 of the present invention.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is a schematic view of a partial structure of a composite filter element in embodiment 1 of the present invention.

Fig. 4 is a schematic structural diagram of a flue gas filter provided in embodiment 2 of the present invention.

Fig. 5 is a schematic diagram of the structure of fig. 4 in a disassembled state.

Wherein, 1-flange; 2-sealing the plug; 3-keel bracket; 3.1-ribs; 3.2-support ring; 3.3-connecting ring; 4-composite filter element; 4.1-outer wire mesh layer; 4.2-ceramic fiber layer; 4.3-inner wire mesh layer; 5-bottom cover; 6-a first flange; 7-punching a hole pipe; 8-a first composite filter element; 8.1-a first ceramic fiber layer; 8.2-wire mesh layer; 9-first bottom cover.

Detailed Description

For the sake of understanding, the following description is further made with reference to the drawings and examples.

Example 1

A flue gas filter comprises at least one filtering unit, wherein each filtering unit comprises a keel bracket 3 and a composite filtering core 4 fixedly positioned in the keel bracket 3, one end of the keel bracket 3 is fixedly provided with a flange 1 to form an exhaust end, and the other end of the keel bracket 3 is fixedly provided with a bottom cover 5;

the composite filter element 4 is of a three-layer structure and comprises an outer metal wire mesh layer 4.1 positioned on the outer side, an inner metal wire mesh layer 4.3 positioned on the inner side and a ceramic fiber layer 4.2 fixedly positioned between the outer metal wire mesh layer 4.1 and the inner metal wire mesh layer 4.3.

Referring to fig. 2, the keel support 3 of the embodiment includes two connection rings 3.3, a plurality of ribs 3.1 arranged longitudinally and at intervals, and support rings 3.2, two ends of the plurality of ribs 3.1 are respectively fixed on the two connection rings 3.3, the support rings 3.2 are located between the two connection rings 3.3, and the support rings 3.2 are fixedly connected with each rib. The support rings are arranged to improve the overall rigidity of the keel support 3.

Referring to fig. 2 and 3, in the three-layer structure of the composite filter element 4 of the present embodiment, two wire mesh layers and a ceramic fiber layer located between the two wire mesh layers are bent together along the radial direction of the filter to form a plurality of continuous pleats, and the plurality of pleats are uniformly arranged in the circumferential direction around the axis of the filter. The number of the folds can be designed to be 3-36 according to the size of the outer diameter. Through setting up a plurality of folds for the unit volume filter area of the filter that this embodiment provided is big, is 1.5 ~ 5 times with diameter tubular filter, consequently can improve the filtration amount of wind greatly, reduces the volume of dust remover, reduces dust pelletizing system cost.

The ceramic fiber layer is ceramic fiber paper which is formed by pulping ceramic fibers with the diameter of 2-10 um and the length of 5-30 mm, forming a net by water flow, dehydrating in vacuum and drying, the pores of the ceramic fiber paper are of a three-dimensional net structure, the pores are developed and have small sizes, the porosity is more than or equal to 80%, and the filtering precision is less than or equal to 10 um. In order to ensure the stable structure of the ceramic fiber paper under the impact of high-temperature and high-speed airflow, a double-sided wire mesh is adopted for clamping, the filter is soaked in inorganic high-temperature adhesive solution after being formed, and a filtering layer with stable structure is formed after drying.

The outer diameter of the composite filter element 4 can be designed to be 100-300 mm according to the use requirement, and the length can be designed to be 200-2000 mm.

The two ends of the composite filter element are respectively and fixedly provided with a hollow-out sealing plug 2, the inner ring of each sealing plug is provided with a fold ring matched with a fold on the composite filter element, and each sealing plug 2 is fixedly connected with a connecting ring 3.3 on the keel support 3 through high-temperature glue. Through high temperature glue, not only can realize the fixed between compound filter core and the fossil fragments support 3, can also strengthen the leakproofness of seam crossing.

In this embodiment, the composite filter element 4 is further loaded with a nitrogen oxide catalyst, so that the composite filter element has Nitrogen Oxide (NO)_x) The catalytic reduction function of (1).

The metal wire mesh layer is made of a wire mesh made of stainless steel or alloy materials or a steel plate mesh made of stainless steel or alloy materials through punching and shearing, and the mesh number of the wire mesh can be 10-100 meshes according to the requirements of use scenes. The ceramic fiber layer is any one of ordinary aluminum silicate ceramic fibers, high-aluminum silicate ceramic fibers, zirconium-containing aluminum silicate ceramic fibers, mullite ceramic fibers, high-silica ceramic fibers, basalt ceramic fibers, carbon fibers and glass fibers, and the thickness of the ceramic fiber layer can be selected from 0.5-10 mm. The flange 1, the keel bracket 3 and the bottom cover 5 are made of metal materials.

Referring to fig. 1, the filter of the present embodiment includes two filter units, and the two filter units are fixedly connected to each other. Specifically, two opposite connecting rings of two filter units are welded to realize fixation. It will be appreciated that in other embodiments, a different number of filter elements may be provided as desired, with fixed connections between adjacent filter elements.

The manufacturing steps of the flue gas filter provided by the embodiment are as follows:

1.1 parts preparation: and respectively processing an upper metal flange 1, a metal keel bracket 3 and a metal bottom cover 5 according to a design drawing.

1.2, manufacturing a composite filter element: the method is characterized in that a metal wire mesh, ceramic fiber paper and a metal wire mesh coiled material with the same width are used as raw materials, a special multi-petal filter element forming machine is adopted, a metal wire mesh, ceramic fiber paper and metal wire mesh three-layer composite ceramic fiber filter felt is inserted into a press knife of the forming machine along the tangential direction of the forming machine, the insertion depth is based on the fact that a side joint reaches a V-shaped bottom after being pressed down by the press knife, after the alignment is correct, the multi-petal filter element forming machine is started, the multi-petal filter element forming machine is bent and rolled for many times, the three-layer composite ceramic fiber filter felt is cut off before the final bending, the three-layer composite ceramic fiber filter felt is bent again, axial connectors formed by two side edges of the head and the tail are lapped and leveled at the V-shaped bottom, and the local shape is as shown in figure 3. And pushing the multi-petal metal wire mesh composite ceramic fiber filter core out of the mold through the material pushing plate, and finishing the manufacture of the composite filter core 4.

1.3 assembling the composite filter element: the taken out composite filter element is horizontally placed in the tool, the V-shaped grooves lapped end to end face upwards, and high-temperature glue is used for filling, so that the sealing of the interface is ensured. After the axial interface is packaged, a metal keel support 3 is vertically sleeved, the lower end face of the composite filter element 4 is positioned at the central line position of a connecting ring 3.3 at the lower end head of the metal keel support, a bottom cover 5 with the outer diameter consistent with the inner diameter of the connecting ring 3.3 is adopted to support the lower end face of the filter element 4, high-temperature glue is adopted to fill the space between the outer periphery of the multi-petal filter element and the keel connecting ring, and the shape after curing is as shown in figure 2, so that one end of the composite filter element and the connecting ring of the keel support are sealed and connected into a whole. The other end of the composite filter element is processed by the same method.

1.4 impregnation treatment of the composite filter element assembly: and (3) immersing the assembled composite filter element into an inorganic glue solution, and taking out and drying the filter element for later use after the filter element is adsorbed and saturated. Or adding nitrogen oxide (NOx) catalyst into the inorganic glue solution, dipping together, drying and standby.

1.5, combined welding: according to the length requirement of the filter, a plurality of sections of filter core assembly bodies after dipping treatment are taken and welded end to end into a whole, then one end of the filter core assembly bodies connected into a whole is welded with a flange 1, and the other end is welded with a bottom cover 5, thus the high-temperature flue gas filter taking the wire mesh composite ceramic fiber paper as the filter medium is manufactured.

Example 2

Referring to fig. 4 and 5, a flue gas filter comprises at least one filtering unit, each filtering unit comprises a punching pipe 7 and a first composite filtering core 8 sleeved and fixed outside the punching pipe, one end of the punching pipe 7 is fixedly connected with a first flange 6 to form an exhaust end of the filter, and the other end is fixedly provided with a first bottom cover 9; the first composite filter element 8 is a two-layer structure comprising a metal wire mesh layer 8.2 and a first ceramic fiber layer 8.1 positioned on the inner side of the metal wire mesh layer, two ends of the metal wire mesh layer are welded with the punching pipe 7 along the circumference, and a welding seam is coated with high-temperature glue for sealing.

In this embodiment, the first composite filter element 8 is formed by rolling up a filter felt of a wire mesh composite ceramic fiber paper with a certain width and length and then welding and lapping longitudinal seams, and high-temperature glue is spread on the lapped longitudinal seams to ensure the sealing of the seams. The diameter can be designed to be 50-200 mm according to the use requirement, and the length can be designed to be 200-10000 mm.

The first composite filter element 8 is also loaded with a nitrogen oxide catalyst, so that the first composite filter element has Nitrogen Oxide (NO)_x) The catalytic reduction function of (1).

The metal wire mesh layer is made of a wire mesh made of stainless steel or alloy materials or a steel plate mesh made of stainless steel or alloy materials through punching and shearing, and the mesh number of the wire mesh can be 10-100 meshes according to the requirements of use scenes. The first ceramic fiber layer is any one of ordinary aluminum silicate ceramic fibers, high-aluminum silicate ceramic fibers, zirconium-containing aluminum silicate ceramic fibers, mullite ceramic fibers, high-silica ceramic fibers, basalt ceramic fibers, carbon fibers and glass fibers, and the thickness of the first ceramic fiber layer can be selected to be 0.5-10 mm. The first flange 6, the perforated pipe 7 and the first bottom cover 9 are all made of metal materials.

2.1 parts preparation: and respectively processing an upper first flange 6, a punching pipe 7 and a first bottom cover 9 according to a design drawing.

2.2 manufacturing a first composite filter element: according to the requirements of the outer diameter and the length of the circular filter element, one piece of metal wire mesh and one piece of ceramic fiber paper with corresponding sizes are cut, the width and the length of the metal wire mesh are slightly larger than the size of the ceramic fiber paper in consideration of the requirement of welding lap edges, and the central lines of the metal wire mesh and the ceramic fiber paper are aligned and overlapped together according to the sequence of the metal wire mesh and the ceramic fiber paper. Adopt the tuber to roll up the compound ceramic fiber filter felt of wire mesh along width direction, the outer lane is the wire mesh, and the inner circle is ceramic fiber paper, and after the side longitudinal joint overlap joint parallel and level, adopt resistance seam to weld firmly with two-layer lapped wire mesh along length direction, brush one deck high temperature glue at seam crossing, guarantee that seam crossing does not reveal.

2.3, dipping treatment of the first composite filter element: and (3) immersing the welded first composite filter element 8 into an inorganic glue solution, and taking out and drying the filter element for later use after the filter element is adsorbed and saturated. Or mixing nitrogen oxide (NOx) catalyst into the inorganic glue solution, dipping together, drying and standby.

2.4 assembling and welding: and sleeving the first composite filter element 8 after dipping and drying into the outer side of the punching pipe 7, connecting the metal wire meshes at two ends of the first composite filter element 8 and two ends of the punching pipe into a whole by adopting circumferential resistance roll welding, and brushing a layer of high-temperature glue at the joint to ensure that the joint is not leaked. And welding a first flange 6 at one end of the punching pipe 7 and welding a first bottom cover 9 at the other end of the punching pipe to manufacture the tubular high-temperature flue gas filter.

The two high-temperature flue gas filters have the same working principle, namely flue gas enters the filters from the outer surfaces of the filters, gas-solid separation is realized through filtration of the filter elements, and the filtered gas is discharged from the inner rings of the flanges. The filter provided by the utility model has the advantages of high filtering precision, small air resistance, good ash cleaning performance, firm structure, high temperature resistance, corrosion resistance, airflow impact resistance and thermal impact resistance; the multi-petal high-temperature flue gas filter also has the advantages of large filtering area per unit volume and the like; is suitable for filtering high-temperature flue gas and dust generated by various industrial furnaces and kilns, and can load Nitric Oxide (NO) in the metal wire mesh composite ceramic fiber filter element_x) Catalyst, which is made to have Nitrogen Oxide (NO) at the same time_x) Of (2) aAnd (4) a reduction function.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A smoke filter, characterized in that: the filter comprises at least one filter unit, wherein each filter unit comprises a keel bracket and a composite filter element fixedly positioned in the keel bracket, one end of the keel bracket is an exhaust end, and the other end of the keel bracket is fixedly provided with a bottom cover;

2. A smoke filter according to claim 1, characterized in that: the keel support comprises two connecting rings and a plurality of ribs, the two ends of the ribs are equally divided and are respectively fixed on the two connecting rings, and the ribs are circumferentially distributed along the connecting rings.

3. A smoke filter according to claim 2, characterized in that: the keel support further comprises at least one support ring, the support ring is located between the two connecting rings, and the support ring is fixedly connected with each rib.

4. A smoke filter according to claim 1, characterized in that: a nitrogen oxide catalyst layer is also loaded on the composite filter element.

5. A smoke filter according to any of claims 1-4, wherein: and the two wire mesh layers in the three-layer structure and the ceramic fiber layer positioned between the two wire mesh layers are bent together along the radial direction of the filter to form a plurality of continuous folds, and the folds are arranged around the axis of the filter in the circumferential direction.

6. A smoke filter according to claim 5, wherein: the composite filter element is characterized by further comprising two sealing plugs which are fixed at two ends of the composite filter element respectively, wherein the inner ring of each sealing plug is provided with a wrinkle ring matched with wrinkles on the composite filter element, and two ends of the composite filter element are fixedly connected with the keel support through the sealing plugs.

7. A smoke filter according to claim 6, wherein: the axial seam of the compound filter element is coated with high-temperature glue for sealing the interface; high-temperature glue used for sealing and connecting is coated between the sealing plugs at the two ends of the composite filter element and the keel bracket.

8. A smoke filter, characterized in that: the filter comprises at least one filter unit, wherein each filter unit comprises a punching pipe and a first composite filter element sleeved and fixed outside the punching pipe, one end of the punching pipe is an exhaust end, and the other end of the punching pipe is fixedly provided with a first bottom cover;

9. A smoke filter according to claim 8, characterized in that: the joint of the punching pipe and the first composite filter element is coated with high-temperature glue for sealing.

10. A smoke filter according to any of the claims 8-9, characterized in that: a nitrogen oxide catalyst layer is also loaded on the first composite filter element.