Bag cage of heat exchange type bag type dust collector

Abstract

The invention discloses a bag cage of a heat exchange type bag type dust collector. The top bowl (1) comprises a top plate (11), an outer ring plate (12) and an inner ring plate (13); the vertical keel (3) is formed by bending a metal pipe into an equidistant S-shaped pipe and is used for conveying a fluid medium for exchanging heat with flue gas; the transverse keels (4) are closed steel rings made of steel wires; the bottom bowl (5) is of a flat-bottom bowl-shaped structure; an upper bent pipe of the vertical keel (3) is tightly welded and fixed to the inner wall of the top bowl inner ring plate (13), and a lower bent pipe is welded and fixed to the inner wall of the bottom bowl (5); the head end and the tail end of the vertical keel (3) are bent into a horizontal shape to form an inlet pipe section (31) and an outlet pipe section (32); and the inlet pipe sections (31) of the adjacent bag cages are hermetically connected through the connecting short pipe (2). According to the invention, a complete pipe is flexibly bent to form the vertical ribs of the bag cage of the filter bag, so that the bag cage of the filter bag is endowed with a function of conveying a heat exchange fluid medium, and a bag type dust collector is transformed into dust collection and heat exchange integrated equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of bag dust collectors, and particularly relates to a bag cage of a heat exchange type bag dust collector. Background Art

[0002] At present, the current situation of waste heat utilization of low-temperature (<200°C) flue gas is that the total amount is large but the utilization rate is low.

[0003] Although technologies such as absorption heat pumps that can utilize low-temperature waste heat have developed rapidly, the technology of directly introducing low-temperature flue gas into the heat pump system for driving is not yet mature, and it is prone to blockage and corrosion, affecting the service life of system equipment. Therefore, the flue gas needs to be first converted into clean hot water or hot steam through a heat exchanger and then enter the heat pump system for driving.

[0004] However, the low-temperature flue gas heat exchange technology has poor economy. Because the specific heat capacity of low-temperature flue gas is low and the temperature is low, the heat exchange area of the heat exchanger must be relatively large, resulting in a large floor area and volume of the heat exchange equipment, large construction and renovation investment, and a long renovation construction period. In addition, limited space is a common problem existing in many enterprises, which severely restricts the waste heat utilization of low-temperature flue gas.

[0005] A bag dust collector is a device that uses a porous bag-shaped filtering element to capture particulate matter and certain gaseous pollutants in flue gas. Due to its high filtration efficiency, low emission concentration, good control effect on fine particles, the filtration performance is not affected by the nature of the soot, and it is suitable for the working conditions of various industries, and can stably achieve ultra-low emissions. At present, the long-bag low-pressure pulse bag dust collector has become the mainstream technical equipment for industrial soot control.

[0006] The filter bag is a flexible filtering element made of fiber filter material, and the filter bag cage mainly plays a role in supporting and protecting the filter bag.

[0007] The general operating temperature of the bag dust collector is 80~240°C. In general scenarios such as bag dust removal of flue gas from sintering, pelletizing, coking, cement, etc., there will be a certain temperature drop space, and there is waste heat utilization value. Coupled with the relatively large volume of the equipment, it is a good object for the integrated transformation of dust removal and heat exchange. Summary of the Invention

[0008] The present invention provides a bag cage of a heat exchange type bag dust collector aiming at the deficiencies of the existing technology, and solves the problem of the waste heat utilization rate of low-temperature flue gas.

[0009] The technical solution of the present invention is: a heat exchange type bag cage for a bag filter, comprising a top bowl, vertical keels, horizontal keels, and a bottom bowl. The top bowl includes a top plate, an outer ring plate, and an inner ring plate, and is formed into an annular inverted groove shape by pressing or welding a metal thin plate; the vertical keels are formed by bending a metal pipe into an equidistant serpentine tubular shape and made into a cylindrical structure matching the filter bag of the bag filter, for conveying a fluid medium for heat exchange with flue gas; the horizontal keels are made of steel wires into a closed steel ring; the bottom bowl is a flat-bottom bowl shape and is formed by stamping a metal thin plate; the upper bent pipe of the vertical keel is welded and fixed closely against the inner wall of the inner ring plate of the top bowl, and the lower bent pipe is welded and fixed to the inner wall of the bottom bowl; the horizontal keels are welded at equal intervals along the axial direction of the inner section of the vertical keel; both ends of the head and tail of the vertical keel are bent into a horizontal shape to form an inlet pipe section and an outlet pipe section; the inlet pipe sections of adjacent bag cages are hermetically connected through a connecting short pipe.

[0010] Further, the outer diameter of the vertical keel pipe is Φ7~Φ15mm, and the wall thickness is 0.5~2.0mm; the number of vertical ribs of a single cylindrical pipe is 8~12, and the spacing is 30~50mm.

[0011] Further, the horizontal centers of the inlet pipe section and the outlet pipe section at the upper part of the vertical keel are at the same height; when the outlet pipe sections of adjacent bag cages are docked with the inlet pipe sections, the gap between them is not less than 1mm.

[0012] Further, the connection method of the connecting short pipe is detachable sealed connection; threaded connection, quick connector or flange connection is adopted; the length of the connecting short pipe matches the docking gap between the inlet pipe section and the outlet pipe section.

[0013] Further, the material of the top bowl is a 1~2mm thick metal thin plate, the inner diameter of the inner ring plate is equal to the outer diameter of the cylindrical vertical keel; the inner diameter of the outer ring plate is 2~10mm larger than the outer diameter of the filter bag mouth, and the height of the outer ring plate is 1~5mm larger than the height dimension of the bag mouth above the flower plate after the filter bag is installed.

[0014] Further, the horizontal keels are made of 4~6mm wire steel wires welded into a closed steel ring, and the arrangement spacing is 150~250mm.

[0015] Further, the inner diameter of the bottom bowl is 10~15mm, and the inner diameter matches the outer diameter of the cylindrical vertical keel.

[0016] The material of the vertical keel can be selected from carbon steel, alloy steel, stainless steel, etc. The material of the vertical keel can be selected from carbon steel, alloy steel, stainless steel, etc.

[0017] The adjacent cage connection scheme described above can be connected in series one by one in sequence, or the filter bag cages can be grouped as needed. In a single group, the cages are first connected in series, and then the groups are connected in parallel. According to the required heat exchange area, the number of heat exchange cages is determined, and then according to the cold-side inlet / outlet pipe layout scheme, the heat exchange cage layout scheme is determined to achieve flexible layout of the cages.

[0018] The beneficial effects of the present invention are as follows: The present invention uses a complete pipe to form the vertical ribs of the filter bag cage through flexible bending, endowing the filter bag cage with the function of transporting heat exchange fluid medium, and transforming the bag filter into an integrated dust removal and heat exchange device. Especially for the dust collector to be transformed, after locally strengthening the flower plate as needed and replacing the heat exchange cage, adding new heat exchange medium cold-side inlet / outlet pipe fittings, etc., it can be quickly realized, with the characteristics of less transformation, short cycle, and low cost. It makes full use of the internal space of the bag filter, provides assistance for the utilization of low-temperature flue gas waste heat, and has remarkable synergistic effects in reducing pollution and carbon emissions. Description of the Drawings

[0019] Figure 1 It is a structural diagram of the connection of 2 cages of a heat exchange type bag filter.

[0020] Figure 2 It is Figure 1 An enlarged view of part A in

[0021] Figure 3 It is a top view of a single cage.

[0022] Figure 4 It is Figure 3 A cross-sectional view taken along I-I in

[0023] Figure 5 It is a schematic diagram of the series / parallel layout form of the cages.

[0024] In the figure: 1 - top bowl; 2 - connecting short pipe; 3 - vertical keel; 4 - horizontal keel; 5 - bottom bowl; 11 - top plate; 12 - outer ring plate; 13 - inner ring plate; 31 - inlet pipe section; 32 - outlet pipe section. Detailed Embodiments

[0025] The present invention will be further described below in conjunction with the drawings and specific implementation cases.

[0026] As Figures 1-5 shown, this implementation case is a cage of a bag filter with heat exchange function matching a filter bag of Φ160mm×7000mm specification, which is composed of a top bowl 1, a connecting short pipe 2, a vertical keel 3, a horizontal keel 4, and a bottom bowl 5.

[0027] The vertical keel 3 is formed by bending a metal pipe into an equidistant serpentine tubular shape and made into a cylindrical structure matching the filter bag. A pipe with an outer diameter of Φ10mm is selected, and the wall thickness is 1.2mm; the outer diameter of the formed cylinder is Φ155mm and the length is 6980mm; the number of vertical ribs of a single cylindrical pipe is 8, and the spacing is 40mm; the horizontal centers of the inlet pipe section 31 and the outlet pipe section 32 at the upper part of the vertical keel 3 should be at the same height. Considering the net spacing of the filter bags of 50mm, the horizontal lengths of the inlet / outlet pipe sections are both 38mm, and the gap between the outlet pipe section 32 and the inlet pipe section 31 of adjacent filter bag cages is about 4mm when they are butted. The material of the vertical keel 3 is selected as carbon steel.

[0028] As Figure 2 shown, adjacent filter bag cages are connected through the connecting short pipe 2 in a threaded manner. The length of the connecting short pipe 2 is 25mm. The internal thread of the connecting short pipe 2 matches the external threads of the inlet pipe section 31 and the outlet pipe section 32, and "zero" leakage connection is achieved through the threaded + high-temperature sealant method.

[0029] The top bowl 1 is formed into an annular inverted buckle groove shape by pressing or welding. The material is a 2mm thick metal sheet. The inner diameter of its inner ring plate 13 is equal to the outer diameter of the cylindrical vertical keel 3, that is, Φ155mm. The inner diameter of the outer ring plate 12 is 5mm larger than the outer diameter of the filter bag mouth. Calculated according to the outer diameter of the filter bag mouth being Φ180mm, the inner diameter of the outer ring plate 12 is Φ185mm. The height of the outer ring plate 12 (i.e., the groove depth) should be 3mm larger than the height dimension of the bag mouth above the flower plate after the filter bag is installed. Calculated according to the outer edge height of the bag mouth above the filter bag flower plate being 12mm, the height of the outer ring plate 12 is 15mm.

[0030] The transverse keel 4 is made of 5mm wire steel wire welded into a closed steel ring. Its shape is a circle with a diameter of Φ135mm, which matches the inscribed plane of the vertical keel 3, and is welded on its inscribed plane at an equal interval of 200mm along the axis direction of the vertical keel 3, and the number is 35.

[0031] The bottom bowl 5 is a flat-bottomed bowl-shaped structure, stamped from a 2mm thick metal sheet. Its inner diameter matches the outer diameter of the cylindrical vertical keel 3, that is, Φ155mm, and the depth is 15mm.

[0032] Description of the installation method of the filter bag cage: During on-site installation of the cage, first place the cage into the hole of the bag filter's flower plate where the filter bags have been installed. Horizontally rotate the cage to adjust its direction and confirm that the outlet pipe section 32 of the cage is horizontally aligned with the inlet pipe section 31 of the adjacent cage. Then, apply high-temperature resistant sealant to the threads of the outlet pipe section 32 and the inlet pipe section 31 respectively. Next, rotate the cage to create a certain space to facilitate the complete installation of the connecting short pipe 2 onto the outlet pipe section 32 of the cage by rotation operation. The length by which the connecting short pipe 2 extends beyond the top end of the outlet pipe section 32 is less than the straight-line distance between the top ends of the outlet / inlet pipe sections of the adjacent cages. Then, rotate and adjust the direction of the cage so that the connecting short pipe 2 on the outlet pipe section 32 of the cage is linearly aligned with the inlet pipe section 31 of the adjacent cage. Rotate the connecting short pipe 2 to achieve a leak-free sealed connection between the outlet / inlet pipe sections of the adjacent cages.

[0033] Description of the cage connection layout form: As Figure 5 shown, the connection scheme for adjacent filter bag cages can be connected in series one by one in sequence, or the filter bag cages can be grouped as needed. First, the cages in a single group are connected in series, and then the groups are connected in parallel. The cage connection layout form is determined according to the layout scheme of the inlet / outlet pipes for the cold-side heat exchange medium and the number of heat exchange cages. The number of heat exchange cages is determined according to the total required heat exchange area and the heat exchange area of a single cage. The heat exchange area of a single cage in this implementation case is 1.8m 2 .

Claims

1. A heat exchange bag filter cage, comprising a top bowl (1), a vertical keel (3), a horizontal keel (4), and a bottom bowl (5), characterized in that The top bowl (1) comprises a top plate (11), an outer ring plate (12), and an inner ring plate (13), which are formed by pressing or welding metal sheets into an annular inverted groove structure; the vertical keel (3) is formed by bending a metal pipe into an equidistant serpentine tube and made into a cylindrical structure matching the filter bag of the belt dust collector, and is used to transport the fluid medium for heat exchange with the flue gas; the transverse keel (4) is made of steel wire into a closed steel ring; the bottom bowl (5) is a flat bottom bowl structure, made of metal The vertical keel (3) is formed by stamping a thin plate; the upper bent pipe of the vertical keel (3) is welded and fixed to the inner wall of the inner ring plate (13) of the top bowl, and the lower bent pipe is welded and fixed to the inner wall of the bottom bowl (5); the inner section of the vertical keel (3) is welded with transverse keels (4) at equal intervals along the axial direction; both ends of the vertical keel (3) are bent into a horizontal shape to form an inlet pipe section (31) and an outlet pipe section (32); the inlet pipe sections (31) of adjacent bag cages are sealed and connected by connecting short pipes (2).

2. A heat exchange bag filter cage according to claim 1, characterized in that The outer diameter of the vertical keel (3) pipe is Φ7~Φ15mm, and the pipe wall thickness is 0.5~2.0mm; the number of vertical ribs of a single cylindrical pipe is 8~12, and the spacing is 30~50mm.

3. A heat exchange bag filter cage according to claim 1, characterized in that The horizontal centers of the inlet pipe section (31) and the outlet pipe section (32) at the upper part of the vertical keel (3) are at the same height; when the outlet pipe sections (32) and the inlet pipe sections (31) of adjacent bag cages are butt-jointed, the gap between the two is not less than 1 mm.

4. A heat exchange bag filter cage according to claim 1, characterized in that The connection method of the connecting short pipe (2) is a detachable sealed connection; a threaded connection, a quick connector or a flange connection is adopted; the length of the connecting short pipe (2) matches the butt clearance between the inlet pipe section (31) and the outlet pipe section (32).

5. A heat exchange bag filter cage according to claim 1, characterized in that The top bowl (1) is made of a 1-2 mm thick metal sheet, the inner diameter of the inner ring plate (13) is equal to the outer diameter of the cylindrical vertical keel (3); the inner diameter of the outer ring plate (12) is 2-10 mm larger than the outer diameter of the bag opening of the filter bag, and the height of the outer ring plate (12) is 1-5 mm larger than the bag opening height dimension of the upper part of the flower plate after the filter bag is installed.

6. A heat exchange bag filter cage according to claim 1, characterized in that The transverse keels (4) are welded with 4-6 mm steel wires to form a closed steel ring, and are arranged at a spacing of 150-250 mm.

7. A heat exchange bag filter cage according to claim 1, characterized in that The inner diameter of the bottom bowl (5) is 10-15 mm, and the inner diameter matches the outer diameter of the cylindrical vertical keel (3).

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