Dust and nitrate integrated purification equipment

Abstract

The utility model discloses dust and nitrate integrated purification equipment which comprises a box group, supports are arranged on the four sides of the bottom of the box group, a pattern plate is arranged in the box group, and a filter cartridge is arranged at the lower port of the pattern plate; an exhaust pipe is arranged on the filter cartridge, a branch pipe group is arranged on the exhaust pipe in a communicating manner, an SCR reactor is arranged at the top of the box group, and two ports of the branch pipe group are connected to an air inlet of the SCR reactor. When gas containing fine dust is filtered through the filter cartridge, the dust is blocked on the outer surface of the filter cartridge, the electromagnetic gas valve is controlled to blow compressed air into the filter cartridge, the filter cartridge expands under pressure, and the dust blocked on the metal filter bag falls into the ash bin. The method comprises the following steps: introducing high-temperature flue gas uniformly mixed with ammonia gas into an SCR reactor at the top of equipment, and reducing NOx in the flue gas into N2 and H2O under the action of a catalyst; at the moment, when high-temperature gas passes through the catalyst, the catalyst blockage phenomenon cannot be caused.

Description

Technical Field

[0001] The utility model belongs to the technical field of dust removal, and in particular relates to dust and saltpeter integrated purification equipment. Background Art

[0002] The combination of SCR reactor and high-temperature bag filter is widely used in flue gas denitrification and dust removal processes in metallurgy, thermal power, automobile, non-ferrous metals and other industries. More specifically, it is used for the purification of high-temperature dust and NOx gases in industrial kilns.

[0003] At present, this type of combined purification equipment is supported by a filter box, and the SCR reactor is arranged on the top of the filter box, wherein a flower plate is used to support the filter cartridge in the filter box; the overall operation is carried out in a bottom-intake and top-exhaust manner, and the dust particles in the high-temperature flue gas are filtered by the filter cartridge, and then the flue gas is reduced and denitrated by the denitration reducing agent in the SCR reactor.

[0004] However, when the filter cartridge collects high-humidity dust-containing gas, the particulate matter and moisture in the flue gas are easily condensed to cause "sticky bags", which has a great impact on the permeability of the filter cartridge pores; secondly, under temperature conditions of 160-200°C, SO3 in the flue gas and the denitrification reducing agent NH3 are easily reacted to form ammonium sulfate. The ammonium sulfate generated in the SCR reactor will accumulate on the catalyst surface, affecting the catalyst activity. The high ash content in the existing high-temperature (300-400°C) SCR denitrification flue gas leads to the risk of ash blocking the catalyst. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a dust and saltpeter integrated purification device which can improve the permeability of the filter cartridge and reduce the risk of catalyst clogging in the SCR reactor.

[0006] To achieve the above purpose, the utility model provides the following technical solution: dust and saltpeter integrated purification equipment, including a box group, the bottom four sides of the box group are provided with supports, the box group is provided with a flower plate and the lower port of the flower plate is provided with a filter cartridge;

[0007] The filter cartridge is provided with an exhaust pipe, the exhaust pipe is connected with a branch pipe group, an SCR reactor is provided on the top of the box group, and two ports of the branch pipe group are connected to the air inlet of the SCR reactor;

[0008] The bottom of the box group is connected to an air inlet pipe, and the upper part of the box group is provided with a spray assembly, which is used to spray compressed air into the filter cartridge and to inject high-temperature flue gas evenly mixed with ammonia into the SCR reactor.

[0009] Preferably, an ash hopper is connected to the bottom of the box group, and the ash hopper is used to carry the falling dust.

[0010] Preferably, the spray assembly includes an access pipe connected to the box group, the top of the access pipe is connected to an electromagnetic air valve, the air inlet end of the electromagnetic air valve is connected to an air inlet pipe, one side of the air inlet pipe is connected to an external compressed air pipeline, and the other side of the air inlet pipe is connected to an external mixed gas pipeline.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] In the utility model, the dust and saltpeter integrated purification equipment is used. High-temperature dust and NOx gas from industrial furnaces enter the equipment from the equipment inlet. Dust with large particles and high specific gravity settles due to the effect of gravity and falls directly into the ash hopper. When the gas containing finer dust passes through the filter cartridge, the dust is retained on the outer surface of the filter cartridge, and the electromagnetic air valve is controlled to blow compressed air into the filter cartridge. The filter cartridge expands due to the pressure, and the dust retained on the metal filter bag falls into the ash bin.

[0013] The high-temperature flue gas evenly mixed with ammonia is passed into the SCR reactor at the top of the equipment. Under the action of the catalyst, the NOx in the flue gas is reduced to N2 and H2O. At this time, when the high-temperature gas passes through the catalyst, it will not cause catalyst blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a partial cutaway schematic diagram of the main view of the utility model;

[0016] Figure 3 for Figure 1 A right side schematic diagram of

[0017] Figure 4 for Figure 2 Schematic top view of .

[0018] In the figure: 1 box group, 2 support, 3 ash hopper, 4 flower plate, 5 filter cartridge, 6 exhaust duct, 7 branch pipe group, 8 SCR reactor, 9 air inlet pipe, 10 injection assembly. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] See also Figure 1 , Figure 2 and Figure 3, as shown, the embodiment of the utility model provides a dust and saltpeter integrated purification device, including a box group 1 arranged on the left and right sides, the four sides of the bottom of the box group 1 are fixed with a support 2 by bolts, the box group 1 is annularly fixed with a flower plate 4 by bolts, the lower port of the flower plate 4 is annularly fixed with a filter cartridge 5 by bolts, the filter cartridge 5 is a high temperature resistant metal filter bag, and the filter cartridge 5 has a filtration accuracy of 20μm;

[0021] An exhaust pipe 6 is fixed by bolts on the upper part between the filter cartridges 5, and a flange on the exhaust pipe 6 is connected to a branch pipe group 7. An SCR reactor 8 is fixed to the top of the box group 1 by a flange, and two end flanges of the branch pipe group 7 are connected to the air inlet of the SCR reactor 8;

[0022] The bottoms of the left and right box groups 1 are connected to each other with an air inlet pipe 9, and the upper part of the box group 1 is provided with a spray assembly 10, which is used to spray compressed air into the filter cartridge 5 and to inject high-temperature flue gas evenly mixed with ammonia into the SCR reactor 8.

[0023] See also Figure 1 , Figure 2 and Figure 3 The bottom flange of the box group 1 is connected with an ash hopper 3, which is used to carry the falling dust.

[0024] See also Figure 1 , Figure 2 and Figure 3 The injection assembly 10 includes an access pipe bolted to the left and right sides of the box group 1, the top flange of the access pipe is connected to an electromagnetic valve, the air inlet end flange of the electromagnetic valve is connected to the air inlet pipe, the air inlet pipe on the left is connected to an external compressed air pipeline, and the air inlet pipe on the right is connected to an external mixed gas pipeline. Furthermore, the access pipe on the left is connected to the SCR reactor 8, and the access pipe on the right is connected to the upper part of the box group 1.

[0025] The control terminal of the electromagnetic valve connects the button switch and the external 12V DC power supply in series through a cable. When the button switch is pressed, the electromagnetic valve opens and compressed air is sprayed into the filter cartridge 5. The filter cartridge 5 expands under pressure, and the dust trapped on the filter cartridge 5 falls into the ash hopper 3. The high-temperature flue gas mixed with ammonia is passed into the high-temperature SCR reactor on the top of the equipment. Under the action of the catalyst, NOx in the flue gas is reduced to N2 and H2O. The flue gas temperature at this time is the highest temperature for SCR denitrification efficiency, so that the high-temperature dust-free gas will not cause catalyst clogging when passing through the catalyst.

[0026] The working principle of this embodiment is as follows: the high-temperature dust-containing and NOx gases of the industrial furnace enter the interior of the equipment from the equipment inlet, and the dust with large particles and high specific gravity settles due to the action of gravity and falls directly into the ash hopper 3; when the gas containing finer dust is filtered through the filter cartridge 5, the dust is retained on the outer surface of the filter cartridge 5, and the electromagnetic air valve is controlled to blow compressed air into the filter cartridge 5. The filter cartridge 5 expands under pressure, and the dust retained on the metal filter bag falls into the ash bin.

[0027] The high-temperature flue gas evenly mixed with ammonia is introduced into the SCR reactor 8 at the top of the equipment. Under the action of the catalyst, NOx in the flue gas is reduced to N2 and H2O. At this time, when the high-temperature gas passes through the catalyst, it will not cause catalyst blockage.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. Dust and saltpeter integrated purification equipment, characterized by: It comprises a box group (1), wherein four sides of the bottom of the box group (1) are provided with supports (2), a flower plate (4) is provided inside the box group (1), and a filter cartridge (5) is provided at the lower end of the flower plate (4); The filter cartridge (5) is provided with an exhaust pipe (6), the exhaust pipe (6) is connected to a branch pipe group (7), an SCR reactor (8) is provided on the top of the box group (1), and two ports of the branch pipe group (7) are connected to the air inlet of the SCR reactor (8); The bottom of the box group (1) is connected to an air inlet pipe (9), and the upper part of the box group (1) is provided with a spray assembly (10), and the spray assembly (10) is used to spray compressed air into the filter cartridge (5) and to inject high-temperature flue gas evenly mixed with ammonia into the SCR reactor (8).

2. The dust and saltpeter integrated purification equipment according to claim 1 is characterized in that: The bottom of the box group (1) is connected to an ash hopper (3), and the ash hopper (3) is used to carry falling dust.

3. The dust and saltpeter integrated purification equipment according to claim 1 is characterized in that: The spray assembly (10) comprises access pipes arranged on both sides of the box group (1), the top of the access pipe is connected to an electromagnetic valve, the air inlet end of the electromagnetic valve is connected to an air inlet pipe, wherein the air inlet pipe on one side is connected to an external compressed air pipeline, and the air inlet pipe on the other side is connected to an external mixed gas pipeline.

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