Denitration and dust removal integrated equipment

Abstract

The invention relates to the technical field of environmental protection equipment, in particular to denitration and dust removal integrated equipment. A main body structure of the bag-type dust collector is adopted, the bag-type dust collector comprises a middle box body and an upper box body, a tubesheet is arranged at the top of the middle box body, a plurality of bags are mounted on the tubesheet, a housing is arranged above each bag, the housing is provided with an upper opening and a lower opening, the lower opening of the housing abuts against the tubesheet, the upper opening of the housing is connected with a denitration catalyst module, and the lower opening of the housing abuts against the tubesheet. The device is characterized in that the device is further provided with a reducing agent injection mechanism and a pulse injection system, each injection pipe penetrates through a row of multiple housings, the injection pipes and the housings are connected in a sealed mode, each injection pipe is provided with a plurality of downward branch pipes, and each branch pipe directly faces a cloth bag on the lower portion. The device has the advantages of small occupied space, small system resistance and convenience in overhaul and maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection equipment, and in particular to an integrated denitrification and dust removal device. Background Art

[0002] In the prior art, waste gas treatment generally adopts an independent bag filter + SCR denitration reactor split process layout, and the front and rear devices are connected by pipelines, which play the role of dust collection and denitration respectively. This method causes the dust removal and denitration equipment to occupy a large space and have high operating resistance.

[0003] Patent CN111644059A in the prior art discloses an integrated dust removal and denitration device, in which a denitration catalyst is arranged in a block above the dust collector, thereby achieving a compact structure, less space occupied, smooth airflow, small inlet and outlet pressure difference, low operating resistance, and small flue gas temperature drop. However, this structure has the following defects: the bag maintenance is inconvenient. As we all know, the bag of the dust collector is a consumable part and needs to be regularly inspected and replaced. If a whole block of catalyst is used, the catalyst needs to be removed during maintenance, which is very troublesome and inconvenient. Summary of the invention

[0004] The problem to be solved by the present invention is: in order to solve the problem that the integrated dust removal and denitrification device in the prior art is inconvenient for daily maintenance, a conveniently maintained integrated denitrification and dust removal device is provided.

[0005] The present invention is implemented through the following technical scheme: an integrated denitrification and dust removal equipment adopts the main structure of a bag dust collector, including a middle box body and an upper box body, a flower plate is arranged on the top of the middle box body, a plurality of cloth bags are installed on the flower plate, a cover shell is arranged above each cloth bag, the cover shell has upper and lower openings, the lower opening of the cover shell and the flower plate are abutted, the upper opening of the cover shell is connected with a denitrification catalyst module, and a reducing agent injection mechanism and a pulse injection system are also arranged. The reducing agent injection mechanism can be arranged in the air inlet duct or in the flue in front. The pulse injection system includes an air bag, an electromagnetic pulse valve, and a spray pipe. Each spray pipe passes through a row of multiple cover shells, and the spray pipe and the cover shell are sealed and connected. A plurality of downward branches are arranged on the spray pipe, and each branch pipe is directly facing the cloth bag below.

[0006] Furthermore, in order to facilitate installation, the cover shell is cylindrical at the bottom and has a square-to-circle structure at the top. The denitration catalyst module is a honeycomb catalyst with a vertical honeycomb channel. The denitration catalyst module and the square opening of the square-to-circle structure are detachably connected.

[0007] Furthermore, in order to facilitate maintenance, the blowing pipe is pressed downward by a connecting piece and a fastener, and the blowing pipe and the flower plate are relatively fixed.

[0008] Furthermore, in order to facilitate installation and maintenance, the end of the blowing pipe is connected to the outlet pipe of the electromagnetic pulse valve through a pipe interface, and the end of the blowing pipe is connected to the first support through bolts, and the first support is fixed on the flower plate.

[0009] Furthermore, in order to facilitate maintenance, the middle box body and the upper box body are of a compartment structure, and a plurality of maintenance doors are arranged on the top of each upper box body.

[0010] Furthermore, in order to improve the sealing effect, a sealing ring is provided at the lower opening of the cover shell.

[0011] The beneficial effects of the present invention are:

[0012] 1. The present invention is provided with a cover shell, which is installed above each bag dust collector. A denitration catalyst module is installed above the cover shell. When working, the flue gas enters the dust collector from the inlet, and the reducing agent injection mechanism injects a sufficient amount of reducing agent. The flue gas and the reducing agent are fully mixed, and are diverted to the middle box through the inlet air duct, and then pass through the bag, and the dust is collected by the bag. The dust-removed air flows through the cover shell and the denitration catalyst module, and after catalysis, a denitration reaction occurs to eliminate nitrogen oxides in the flue gas. Clean air flows out from the outlet air duct, and the dust removal and denitration work are completed at one time. It has the advantages of small space occupation and small system resistance.

[0013] 2. During maintenance, the present invention can check whether each denitration catalyst module is damaged. If damaged, it can be replaced individually. If the bag is damaged, the fasteners fixing the injection pipe can be removed, the injection pipe and multiple covers can be moved as a whole, and the damaged bag can be replaced and then restored. The whole process is relatively simple and can be completed by two people working together.

[0014] 3. The pulse spraying mechanism of the present invention sprays regularly, and the presence of the cover can ensure sufficient spraying pressure and improve the spraying effect.

[0015] 4. The denitration catalyst module of the present invention is small in size and can be disassembled and assembled by one person, making maintenance convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of the integrated denitration and dust removal equipment according to the present invention;

[0017] Figure 2 for Figure 1 The local enlarged view of point I in the middle;

[0018] Figure 3 It is a left view of the integrated denitration and dust removal equipment according to the present invention;

[0019] Figure 4 for Figure 3 A partial enlarged view of point II in the middle. ;

[0020] Figure 5 This is a top view of the integrated denitrification and dust removal equipment described in the present invention.

[0021] In the figure: 1 middle box body; 2 upper box body; 3 flower plate; 4 cloth bag; 5 cover shell; 6 denitrification catalyst module; 7 injection pipe; 8 branch pipe; 9 first support; 10 second support; 11 air bag; 12 electromagnetic pulse valve; 13 steel bracket; 14 inlet air duct; 15 ash hopper; 16 outlet air duct; 17 inspection door. DETAILED DESCRIPTION

[0022] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0023] like Figure 1-5 As shown, a denitration and dust removal integrated equipment adopts the main structure of a bag dust collector, including a steel support 13, an inlet air duct 14, an ash hopper 15, a middle box 1, an upper box 2, an outlet air duct 16, a pulse injection system, etc. A flower plate 3 is arranged on the top of the middle box 1, a plurality of holes are arranged on the slide plate, a plurality of bags 4 are installed in the holes, a keel is arranged inside the bag 4, and a cover shell 5 is arranged above each bag 4, the cover shell 5 has upper and lower openings, the lower opening of the cover shell 5 and the flower plate 3 are against each other, and a sealing ring can be arranged on the lower opening of the cover shell 5 to ensure that the cover shell 5 and the flower plate 3 are sealed and leak-proof, and the upper opening of the cover shell 5 is connected to a denitration catalyst module 6,

[0024] The pulse jet air cylinder includes an air bag 11, an electromagnetic pulse valve 12, and a blow pipe 7. Each blow pipe 7 passes through a row of multiple cover shells 5, and the blow pipe 7 and the cover shell 5 are sealed and connected. The blow pipe 7 is provided with a plurality of downward branches 8, and each branch 8 faces the cloth bag 4 below. During production, a hole can be opened in advance on the cover shell 5. After the blow pipe 7 passes through a plurality of cover shells 5, it is fully welded to connect a plurality of cover shells 5 and a blow pipe 7 as a whole to ensure that there is no air leakage. Finally, the branch pipe 8 on the blow pipe 7 is welded. The blow pipe 7 is pressed downward by a connector and a fastener, and the blow pipe 7 and the flower plate 3 are relatively fixed. During installation, the end of the blow pipe 7 is connected to the first support 9 on the flower plate 3 by bolts, and the middle part of the blow pipe 7 is installed on the second support 10. The first support 9 and the second support 10 are fixed on the flower plate 3. The end of the blowing pipe 7 is connected to the outlet pipe of the electromagnetic pulse valve 12 through a pipe interface to ensure that each cover shell 5 and the flower plate 3 are tightly connected without air leakage.

[0025] A reducing agent injection mechanism is provided, and the reducing agent injection mechanism can be arranged in the air inlet duct or in the flue in front to ensure sufficient mixing time.

[0026] For the convenience of installation, the cover shell 5 is cylindrical at the bottom, and the cylindrical cover shell 5 covers the outside of the cloth bag 4. The top is a square-circle structure. The denitration catalyst is a long square block, which is convenient for catalyst manufacturers to produce. The denitration catalyst module 6 is a honeycomb catalyst, and the honeycomb channel is vertical. The denitration catalyst module 6 and the square opening of the square circle are detachably connected, and a rubber ring can be installed on the inner wall of the square opening for sealing. The denitration catalyst module 6 is inserted into the square buckle from top to bottom and snapped in to ensure sealing.

[0027] The middle box body 1 and the upper box body 2 are of a compartment structure, and a plurality of inspection doors 17 are arranged on the top of each upper box body 2. After opening the inspection door 17, one can enter the upper box body 2 for inspection. During inspection, each denitration catalyst module 6 can be checked for damage. If damaged, it can be replaced individually. If the cloth bag 4 is damaged, the fasteners fixing the injection pipe 7 can be removed, the injection pipe 7 and the plurality of cover shells 5 can be moved as a whole, and the damaged cloth bag 4 can be replaced and then restored. The whole process is relatively simple and can be completed by two people working together.

[0028] In this solution, the flue gas enters the dust collector from the entrance, and the reducing agent injection mechanism injects a sufficient amount of reducing agent. The flue gas and reducing agent are fully mixed, and then flow into the middle box 1 through the inlet air duct 14, and then pass through the bag 4, and the dust is collected by the bag 4. The air after dust removal flows through the cover 5 and the denitration catalyst module 6, and after catalysis, a denitration reaction occurs to eliminate nitrogen oxides in the flue gas. Clean air flows out from the outlet air duct 16, and the dust removal and denitration work is completed at one time. The pulse spraying mechanism sprays regularly, and the existence of the cover 5 can ensure sufficient spraying pressure and improve the spraying effect. This solution has the advantages of small space occupation, small system resistance, and convenient maintenance.

[0029] In summary, the integrated denitrification and dust removal equipment described in the present invention adopts multiple independent ones and has the advantages of small space occupation, small system resistance and convenient maintenance.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above implementation is only to illustrate the technical concept and features of the present invention, and its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated denitrification and dust removal device, characterized in that: The main structure of the dust collector using a bag (4) comprises a middle box (1) and an upper box (2), wherein a flower plate (3) is arranged on the top of the middle box (1), a plurality of bags (4) are mounted on the flower plate (3), a cover shell (5) is arranged above each bag (4), the cover shell (5) has upper and lower openings, the lower opening of the cover shell (5) abuts against the flower plate (3), and the upper opening of the cover shell (5) is connected to a denitration catalyst module (6), A reducing agent injection mechanism and a pulse injection system are also provided. The reducing agent injection mechanism is arranged in the air inlet duct or in the front flue. The pulse spray system comprises an air bag (11), an electromagnetic pulse valve (12), and a spray pipe (7). Each spray pipe (7) penetrates a row of multiple housings (5), and the spray pipe (7) and the housings (5) are sealed and connected. The spray pipe (7) is provided with a plurality of downward branches (8), and each branch pipe (8) faces the cloth bag (4) below.

2. The integrated denitrification and dust removal equipment according to claim 1 is characterized in that: The cover shell (5) is cylindrical at the bottom and has a square-to-circle structure at the top. The denitration catalyst module (6) is a honeycomb catalyst with a vertical honeycomb channel. The denitration catalyst module (6) and the square opening of the square-to-circle structure are detachably connected.

3. The integrated denitrification and dust removal equipment according to claim 1 is characterized in that: The blowing pipe (7) is pressed downward by a connecting piece and a fastener, and the blowing pipe (7) and the flower plate (3) are relatively fixed.

4. The integrated denitrification and dust removal equipment according to claim 1 is characterized in that: The end of the blowing pipe (7) is connected to the outlet pipe of the electromagnetic pulse valve (12) through a pipe interface, the end of the blowing pipe (7) is connected to the first support (9) through bolts, the middle part of the blowing pipe (7) is installed on the second support (10), and the first support (9) and the second support (10) are fixed on the flower plate (3).

5. The integrated denitrification and dust removal equipment according to claim 1 is characterized in that: The middle box body (1) and the upper box body (2) are of a compartment structure, and a plurality of inspection doors (17) are arranged on the top of each upper box body (2).

6. The integrated denitrification and dust removal equipment according to claim 1 is characterized in that: The lower opening of the cover shell (5) is provided with a sealing ring.

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