Bag type dust removal and denitration integrated device for industrial flue gas

Abstract

The utility model discloses a bag type dust removal and denitration integrated device for industrial flue gas. Comprising a dust removal filter chamber, an ash hopper is installed on the lower portion of the dust removal filter chamber, a pattern plate is welded to the upper portion of the dust removal filter chamber, a gas purification chamber is welded to the upper portion of the pattern plate, and an ammonia spraying chamber, a rectifying chamber, an SCR reaction chamber, an air outlet pipe and an air inlet pipe are sequentially and vertically installed on the top of the gas purification chamber from bottom to top; the air inlet pipe vertically penetrates through the SCR reaction chamber, the rectifying chamber, the ammonia spraying chamber, the gas purifying chamber and the pattern plate from the top and enters the dust removal filtering chamber, the air inlet pipe and the air outlet pipe are coaxial, the pipe diameter of the air outlet pipe is larger than that of the air inlet pipe, and the air inlet pipe is sleeved with the air outlet pipe. In addition, the tower structure is arranged in a vertically stacked mode, and the occupied space can be obviously saved.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial flue gas treatment, and specifically relates to an industrial flue gas bag-type dust removal and denitrification integrated device. Background Art

[0002] At present, bag dust removal is the mainstream technology for efficiently capturing industrial flue gas particulate matter and achieving ultra-low emissions, while selective catalytic reduction technology (SCR denitrification technology) is the mainstream technology for solving the problem of nitrogen oxide emissions.

[0003] There are two common processes for coordinated removal of nitrogen oxides by bag dust removal: one is to place the bag dust collector and the SCR denitrification reactor in front and behind, and connect the two with a pipe; the other is to use functional filter bags or filter cartridges, that is, load catalysts on fibers, filter materials (bags) or filter cartridges, so that the bag dust collector has composite functions such as dust removal and denitrification.

[0004] These two methods have their own advantages and disadvantages: the flue gas treated by the former can meet the emission standards and has stable operation, but because the two devices are arranged separately, they occupy a large area, have a high one-time investment, and the system resistance and energy consumption are also relatively high; the latter can achieve dust removal and denitrification at the same time, with a simple structure and a small footprint, but the functional filter elements are expensive, easy to clog when operating at low temperatures, and have limited denitrification efficiency. It cannot adapt to flue gas conditions with high NOx content, and it is difficult to meet the requirements of ultra-high emission indicators. Summary of the invention

[0005] Aiming at the defects in the prior art, the present invention provides an integrated device for industrial flue gas bag-type dust removal and denitrification.

[0006] The technical solution of the present invention is: an integrated industrial flue gas bag-type dust removal and denitrification device, the bag-type dust removal part includes a dust removal filter chamber, the bottom of the dust removal filter chamber is welded to a support frame; an ash hopper is installed at the lower part of the dust removal filter chamber, a flower plate is welded at the upper part, a detachable filter element is sealed and installed on the flower plate hole, a clean air chamber is welded on the upper part of the flower plate, a dust cleaning device is installed inside the clean air chamber, an ammonia spray chamber, a rectifier chamber, an SCR reaction chamber, an air outlet pipe and an air inlet pipe are vertically installed in sequence from bottom to top on the top of the clean air chamber; the air inlet pipe vertically passes through the SCR reaction chamber, the rectifier chamber, the ammonia spray chamber, the clean air chamber and the flower plate from the top to enter the dust removal filter chamber, the air inlet pipe is coaxial with the air outlet pipe, the diameter of the air outlet pipe is larger than that of the air inlet pipe, and the air inlet pipe is sleeved in the air outlet pipe.

[0007] According to an embodiment of the present invention, a homogenizing device is provided in the ammonia spray chamber, and the homogenizing device is a single form or a combination of multiple forms of an impact baffle, a grid plate or a perforated plate.

[0008] According to an embodiment of the present invention, a denitration catalyst is arranged in the SCR reaction chamber. The denitration catalyst is distributed throughout the SCR reaction chamber in a zigzag or ring-shaped manner with the air inlet pipe as the center, and is arranged in a single layer or multiple layers.

[0009] According to an embodiment of the present invention, the filtering mode of the dust removal filter chamber is external filtering.

[0010] According to an embodiment of the present invention, the cleaning device is pulse jet cleaning or sonic cleaning.

[0011] According to an embodiment of the present invention, inspection doors are installed on the sides of the clean air chamber and the SCR reaction chamber.

[0012] According to an embodiment of the present invention, an ammonia spray pipe is installed at the outer periphery of the ammonia spray chamber, and a nozzle is arranged on the ammonia spray pipe, the number of the nozzles is ≥1, and the nozzle is installed facing the direction of the flue gas.

[0013] According to an embodiment of the present invention, the planar arrangement of the pulse jet cleaning system is to take the air inlet duct as the center and evenly arrange a number of standard modules around the periphery of the air inlet duct.

[0014] The filter element can be made of organic or inorganic filter materials according to the smoke temperature, and the temperature range is preferably 180°C to 500°C.

[0015] The working principle of the present invention is: the industrial flue gas first enters the dust removal and filtration chamber vertically from the top air inlet pipe, and is evenly diffused and filtered to efficiently remove particulate matter, and then rises to enter the clean air chamber and the ammonia spray chamber in turn. At the same time, the ammonia spray pipe sprays ammonia gas, which is quickly mixed with the flue gas by the mixing device and then enters the rectifier chamber together to achieve the uniformity of the mixed flue gas, and then enters the SCR reaction chamber for catalytic reduction reaction. The purified clean gas is discharged from the top air outlet pipe. The dust attached to the filter element in the dust removal and filtration chamber is removed by the cleaning device and directly falls into the ash hopper, and is discharged from the ash discharge port of the ash hopper.

[0016] When installing or replacing filter elements and inspecting the cleaning device, you can enter the clean air chamber through the inspection door and stand on the flower board to operate.

[0017] The volume, material, structural form and number of layers of the catalyst can be designed and selected according to the flue gas conditions, and preferably two layers of catalyst are arranged; when the catalyst is maintained and overhauled, the side inspection door of the SCR denitration reaction chamber can be used to enter and perform inspection and replacement operations.

[0018] The beneficial technical effect of the present invention is that the bag dust collector and the SCR denitrification device are vertically stacked up and down to form an integrated dust removal and denitrification device, which not only ensures the ultra-low emission of particulate matter, but also realizes efficient denitrification under fine dust conditions, and can effectively avoid problems such as catalyst wear, blockage and poisoning deactivation, significantly improve the system operation stability, ensure and improve the denitrification efficiency, greatly extend the service life of the catalyst, significantly reduce the catalyst dosage, reduce the operation resistance and energy consumption, effectively reduce the operation and maintenance costs, and improve quality and efficiency; at the same time, the device has a vertically stacked tower structure, which can also significantly save space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a vertical view of an integrated industrial flue gas bag dust removal and denitrification device.

[0020] Figure 2 yes Figure 1 Middle AA section view.

[0021] In the figure: 1 air inlet duct, 2 dust removal and filtering chamber, 3 clean air chamber, 4 ammonia spraying chamber, 5 rectification chamber, 6 SCR reaction chamber, 7 air outlet duct, 8 ammonia spraying pipe, 9 inspection door, 10 mixing device, 11 catalyst, 12 ash cleaning device, 13 flower plate, 14 filter element, 15 ash hopper, 16 support frame. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings of the specification. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] An integrated device for industrial flue gas bag dust removal and denitrification comprises: an air inlet pipe 1, a dust removal and filtering chamber 2, a clean air chamber 3, an ammonia spraying chamber 4, a rectifying chamber 5, an SCR reaction chamber 6, an air outlet pipe 7, an ammonia spraying pipe 8, an inspection door 9, a mixing device 10, a catalyst 11, a dust cleaning device 12, a flower plate 13, a filter element 14, an ash hopper 15, and a support frame 6.

[0024] The dust removal filter chamber 2 is welded to the support frame 16 at the bottom, an ash hopper 15 is installed at the lower part, a flower plate 13 is welded at the upper part, a detachable filter element 14 is sealed and installed on the flower plate hole, a clean air chamber 3 is welded on the upper part of the flower plate 13, and a dust cleaning device 12 is installed inside the clean air chamber 3.

[0025] The top of the clean air chamber 3 is vertically installed with an ammonia spray chamber 4, a rectifying chamber 5, an SCR reaction chamber 6, an air outlet pipe 7 and an air inlet pipe 1 in sequence from bottom to top; the air inlet pipe 1 is coaxial with the air outlet pipe 7, vertically passes through the SCR reaction chamber 6, the rectifying chamber 5, the ammonia spray chamber 4, the clean air chamber 3 and the flower plate 13 from the top, enters the dust removal and filtering chamber 2, and is sealed and welded with the flower plate 13 and other components.

[0026] Each functional compartment is a hollow structure formed by welding a steel frame and a steel plate enclosure. Each functional compartment is connected by welding to form a combined cavity that is internally connected.

[0027] The homogenizing device 10 is arranged inside the ammonia injection chamber 4 and is firmly welded; the ammonia injection pipe 8 is installed on the periphery of the ammonia injection chamber 4, and a plurality of nozzles are evenly distributed; the catalyst 11 is placed inside the SCR reaction chamber 6 in a detachable sealed installation manner; the inspection door 9 is respectively installed on the clean air chamber 3 and the side of the SCR reaction chamber 6 by welding.

[0028] The bag dust collector and SCR denitrification device of the integrated industrial flue gas bag dust removal and denitrification device are separately arranged and adopt a combined structure of vertical stacking installation. The functional chambers are stacked in the vertical direction to form an integrated tower structure, that is, the dust removal filter chamber 2 is installed on the bottom ash hopper 15, and the upper part thereof is welded and installed with a clean air chamber 3, an ammonia injection chamber 4, a rectifier chamber 5, an SCR reaction chamber 6, etc. in sequence.

[0029] The integrated industrial flue gas bag dust removal and denitrification device generally adopts a top vertical air inlet and outlet method. The air inlet pipe 1 and the air outlet pipe 7 adopt a coaxially arranged sleeve form. The diameter of the air outlet pipe 7 is larger than that of the air inlet pipe 1, and the specific size is designed according to needs.

[0030] The filtering mode of the dust removal filter chamber 2 is external filtering, that is, the dust is attached to the outer surface of the filter bag after being filtered.

[0031] The cleaning device 4 mainly uses pulse jet cleaning as its main cleaning method, and may also use other methods such as sound waves.

[0032] The planar arrangement method of the pulse jet cleaning device 4 is that the air inlet pipe 1 is taken as the center, and a plurality of standard modules are evenly arranged around the periphery thereof.

[0033] The filter element 14 can be made of organic or inorganic materials according to the smoke temperature.

[0034] The denitration catalyst 11 is arranged in the SCR reaction chamber 6 in a circular or ring-shaped manner with the air inlet pipe 1 as the center, covering the entire SCR reaction chamber 6. It can be arranged in a single layer or in multiple layers, and can be designed as needed. The material of the catalyst 11 can also be selected as high-temperature, medium-temperature or low-temperature material as needed.

[0035] The ammonia spray pipe 8 is provided with a nozzle number ≥ 1, and the nozzle is installed facing the direction of the flue gas.

[0036] The homogenizing device 10 is a single type or a combination of multiple types such as an impact baffle, a grid plate or a perforated plate, and is designed and selected according to needs.

[0037] by Figure 1 , Figure 2 As an example, the dust filter chamber 2 is welded to the support frame 16, the ash hopper 15 is installed at the lower part, and the flower plate 13 is welded at the upper part. The detachable filter element 14 is sealed and installed on the flower plate hole. The filter material can be selected according to the characteristics of the flue gas, and the diameter range is 130mm~160mm; the clean air chamber 3 is welded on the upper part of the flower plate 13, and a dust cleaning device 12 is installed inside the clean air chamber 3; the inspection door 9 is welded on the side of the clean air chamber 3, and the ammonia spray chamber 4 is welded on the top; the ammonia spray chamber 4 is surrounded by ammonia spray pipes 8, and a mixing device 10 is installed inside, and the mixing device 10 is firmly welded to the inner wall of the ammonia spray chamber 4; the rectifier chamber 5 is welded on the upper part of the ammonia spray chamber 4, and the SCR reaction chamber 6 is welded on the upper part of the rectifier chamber 5; a detachable catalyst 11 is sealed and installed inside the SCR reaction chamber 6, and the material and structural shape of the catalyst 11 can be selected according to the characteristics of the flue gas and the layout method, and the reaction temperature is in the range of 180℃~500℃; the inspection door 9 is welded on the side of the SCR reaction chamber 6, and the top is welded to the air outlet pipe 7.

[0038] The air inlet pipe 1 and the air outlet pipe 7 are installed in the form of coaxial sleeves; the air inlet pipe 1 is installed inside the industrial flue gas bag dust removal and denitrification integrated device, and vertically passes through the SCR reaction chamber 6, the rectifier chamber 5, the ammonia injection chamber 4 and other functional chambers from the top to the bottom, enters the lower part of the dust removal and filtration chamber 2, and is sealed and welded with the flower plate 13 and other components.

[0039] When installing and replacing the filter element 14 and the catalyst 11, the inspection doors 9 on the sides of the clean air chamber 3 and the SCR reaction chamber 6 can be opened respectively to enter the interior for operation.

[0040] When the device of the invention is in operation, the industrial flue gas first enters the dust removal filter chamber 2 vertically from the top air inlet pipe 1, is evenly diffused and filtered by the filter element 14, and then rises to enter the clean air chamber 3 and the ammonia spray chamber 4 in turn. At the same time, the ammonia spray pipe 8 sprays ammonia gas, which is quickly mixed with the flue gas by the mixing device 10 and then enters the rectification chamber 5 together to achieve the uniformity of the mixed flue gas, and then enters the SCR reaction chamber 6 for catalytic reduction reaction. The purified clean gas is discharged from the top air outlet pipe 7. The dust attached to the filter element 14 in the dust removal filter chamber is removed by the cleaning device 12 and directly falls into the ash hopper 15, and is discharged from the ash discharge port of the ash hopper.

[0041] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. An integrated industrial flue gas bag dust removal and denitrification device, the bag dust removal part comprising a dust removal filter chamber (2), the bottom of the dust removal filter chamber (2) being welded to a support frame (16); an ash hopper (15) being installed at the lower part of the dust removal filter chamber (2), a flower plate (13) being welded at the upper part, a detachable filter element (14) being sealed and installed on the flower plate hole, a clean air chamber (3) being welded at the upper part of the flower plate (13), and a dust cleaning device (12) being installed inside the clean air chamber (3), wherein the dust removal device (12) is installed at the lower part of the dust removal filter chamber (2), wherein the dust removal device (15) is installed at the lower part of the dust removal filter chamber (2), and wherein the dust removal device (12) is installed at the lower part of the dust removal filter chamber (2), wherein the dust removal device (15) is installed at the lower part of the dust removal filter chamber (2), and wherein the dust removal device (12) is installed at the lower part of the dust removal filter chamber (2), wherein the dust removal device (15) is installed at the lower part of the dust removal filter chamber (2), and wherein the dust removal device (15 ... wherein the dust removal device (15) is installed at the lower part of the dust removal filter chamber (2), wherein the dust removal device (15) is installed at the lower part of the dust removal filter chamber (2), wherein the dust removal device (15) is installed at the lower part The top of the clean air chamber (3) is vertically installed with an ammonia spray chamber (4), a rectification chamber (5), an SCR reaction chamber (6), an air outlet pipe (7) and an air inlet pipe (1) in sequence from bottom to top; the air inlet pipe (1) vertically passes through the SCR reaction chamber (6), the rectification chamber (5), the ammonia spray chamber (4), the clean air chamber (3) and the flower plate (13) from the top to enter the dust removal and filtering chamber (2); the air inlet pipe (1) is coaxial with the air outlet pipe (7); the diameter of the air outlet pipe (7) is larger than that of the air inlet pipe (1); and the air inlet pipe (1) is sleeved inside the air outlet pipe (7).

2. The industrial flue gas bag dust removal and denitrification integrated device according to claim 1 is characterized in that A homogenizing device (10) is arranged in the ammonia spraying chamber (4), and the homogenizing device (10) is in the form of a single impact baffle, a grid plate or a perforated plate, or a combination of multiple forms.

3. The industrial flue gas bag-type dust removal and denitrification integrated device according to claim 1 is characterized in that A denitration catalyst (11) is arranged in the SCR reaction chamber (6). The denitration catalyst (11) is arranged in a single layer or multiple layers in the SCR reaction chamber (6) with the air inlet pipe (1) as the center and in a circular or ring-shaped manner, covering the entire SCR reaction chamber (6).

4. The industrial flue gas bag-type dust removal and denitrification integrated device according to claim 1 is characterized in that The filtering method of the dust removal filter chamber (2) is external filtering.

5. The integrated industrial flue gas bag dust removal and denitrification device according to claim 1 is characterized in that The cleaning device (12) is a pulse jet cleaning device or a sonic cleaning device.

6. The industrial flue gas bag dust removal and denitrification integrated device according to claim 1 is characterized in that Inspection doors (9) are installed on the sides of the clean air chamber (3) and the SCR reaction chamber (6).

7. The integrated industrial flue gas bag dust removal and denitrification device according to claim 1 is characterized in that An ammonia spray pipe (8) is installed on the outer periphery of the ammonia spray chamber (4), and a nozzle is provided on the ammonia spray pipe (8), the number of the nozzles being ≥1, and the nozzle is installed facing the direction of the flue gas.

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