Wet dust removal device

Abstract

The invention discloses a wet dust removal device which comprises a venturi tower, a demister located at the top of the venturi tower and a water tank communicated with the bottom of the venturi tower. A guide air inlet pipe is arranged on the outer side face, close to the top, of the Venturi tower, a spraying device and an exhaust pipe vertically extending downwards are arranged on the top of an inner cavity of the Venturi tower, and an upper pipe opening of the exhaust pipe is communicated with the demister. The dust-containing gas is conveyed in the direction tangent to the inner wall of the venturi tower through the guide gas inlet pipe, so that the dust-containing gas forms a spiral downward airflow in the venturi tower, the spiral flowing path of the dust-containing gas in the venturi tower is prolonged, the dust-containing gas is in full contact with water mist sprayed by the spraying device, and the dust removal efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of industrial waste gas treatment equipment, and in particular to a wet dust removal device. Background Art

[0002] Wet dust removal devices usually deal with dust particles, flue gas and other pollutants in the air. They mainly use water mist or water droplets to fully contact and mix with dust-containing gases. Through mechanisms such as inertial collision, interception and diffusion, dust particles are captured and condensed, thereby achieving the effect of dust removal and air purification.

[0003] The wet dust removal device in the prior art has the following main disadvantages in practical application: 1. The dust removal device is complex and difficult to maintain. 2. The dust removal device is not compact in design, resulting in the problem of occupying a lot of space. 3. The dust-containing gas stays in the wet dust removal device for a short time or moves along a short path, resulting in the dust-containing gas not being able to fully contact with the water mist, resulting in poor dust removal effect.

[0004] For example, a Chinese patent with publication number CN118001866 A discloses a venturi scrubber, including a support seat, a treatment pipe and a spray assembly, wherein the treatment pipe is arranged in a vertical direction, and the spray assembly is used to spray the inside of the treatment pipe; a packing layer is provided on the main body of the venturi tower, and the packing layer is placed on the top of the venturi tower and is used to remove water from the waste gas after spraying. Since the treatment pipe is arranged outside the main body of the venturi tower, the structure of the scrubber is not compact, resulting in a large volume of the scrubber, which occupies a lot of space and is not suitable for use in places with limited space.

[0005] Another example is a Chinese patent with publication number CN118001866 A, which discloses a coke oven gas water washing spray dust removal device. In order to increase the path of dusty gas circulation, a vortex water washing mixer is arranged in the vertical tower body. The vortex water washing mixer includes a vortex guide housing, a spray joint, a vortex water washing pipe and a turbulence enhancement unit. The spray joint is arranged along the spiral curve array of the outer wall of the vortex guide housing. The vortex water washing pipe is arranged around the outside of the side wall of the vortex guide housing. The vortex water washing pipe is connected to the spray joint. The bottom of the vortex water washing pipe is connected to the liquid supply pipe 1. Under the action of the spray liquid pump, liquid flows from the liquid supply pipe 1, the vortex water washing pipe and the spray joint into the vortex guide housing to wash the gas inside. Due to the complex structure of the vortex guide housing, the dust particles in the gas are easy to cause the vortex guide housing to be blocked when the vortex guide housing is washed, which is difficult to maintain.

[0006] In view of this, the present invention proposes a wet dust removal device to solve the above problems. Summary of the invention

[0007] In order to overcome the deficiencies of the above-mentioned technologies, the present invention provides a wet dust removal device with a simple structure and easy maintenance; the dust-containing gas spirally moves in the Venturi tower and can fully contact with the water mist, thereby achieving efficient dust removal.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A wet dust removal device comprises a Venturi tower, a demister located at the top of the Venturi tower, and a water tank connected to the bottom of the Venturi tower. A guide air inlet pipe is provided on the outer side surface of the Venturi tower near the top, and the guide air inlet pipe is used to transport the dust-containing gas into the Venturi tower in a tangential direction to the inner wall of the Venturi tower; a spray device and an exhaust pipe extending vertically downward are provided on the top of the inner cavity of the Venturi tower, and the upper pipe mouth of the exhaust pipe is connected to the demister, and the inner wall of the Venturi tower is used to guide the dust-containing gas to spiral downward around the exhaust pipe, the spray device is used to spray the dust-containing gas, and the exhaust pipe is used to transport the gas after spraying and dust removal to the demister, and the water tank is used to collect dust-containing sewage.

[0010] Preferably, one end of the guide air intake pipe connected to the Venturi tower is an oblique arc opening, the oblique arc opening fits with the arc surface of the Venturi tower, and the oblique arc opening is not opposite to the exhaust pipe.

[0011] Preferably, the guide air intake pipe is located in front of the Venturi tower, and the guide air intake pipe extends backward to form a tube body structure with asymmetric length on the left and right sides. The longer side of the guide air intake pipe is tangent to the tower wall of the Venturi tower, and the shorter side of the guide air intake pipe is closer to the exhaust pipe than the longer side of the guide air intake pipe.

[0012] Preferably, an air intake hood is connected to the end of the air intake pipe opposite to the oblique arc opening, and an air intake port is provided at the end of the air intake hood opposite to the air intake pipe, and the distance between the air intake port and the longer side of the guide air intake pipe is shorter than the distance between the air intake port and the shorter side of the guide air intake pipe.

[0013] Preferably, the wet dust removal device is provided with two Venturi towers along the left and right directions, each Venturi tower is provided with a guide air intake pipe, the two guide air intake pipes are symmetrical on the left and right, the two guide air intake pipes are connected to the same air intake hood, and the width of the air intake hood gradually increases from the air inlet toward the guide air intake pipe.

[0014] Preferably, the Venturi tower comprises a cylindrical body and a conical air guide cover, the upper opening of the conical air guide cover is larger than the lower opening of the conical air guide cover, the upper end of the conical air guide cover is connected to the cylindrical body, and the lower end of the conical air guide cover is connected to the water tank through a wastewater pipe; the spray device and the exhaust pipe are both located in the cylindrical body.

[0015] Preferably, a filter box is provided on one side of the water tank, and the filter box is divided into a filter area and a water purification area. A plurality of filter screens are provided in the filter area, and the filter area is connected to the water tank through a sewage channel. The wet dust removal device also includes a water pump, and the water pump is used to transport the water in the water purification area to the spray device.

[0016] Preferably, the inner bottom of the water tank is provided with a diversion slope inclined toward the filter box.

[0017] Preferably, the spray device comprises an annular water pipe located in the Venturi tower, and a water inlet pipe for connecting the annular water pipe and an output end of a water pump, and a plurality of water mist nozzles are evenly arranged at the bottom of the annular water pipe.

[0018] Preferably, the demister comprises a demister box, a water-absorbing filler is arranged in the demister box, and the demister box is provided with a water vapor port connected to the exhaust pipe.

[0019] Preferably, an exhaust port is provided at the top of the demisting box, and an air extractor is provided at the exhaust port.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention conveys the dust-containing gas in a direction tangential to the inner wall of the Venturi tower through a guide air inlet pipe, so that the dust-containing gas forms a spiral downward airflow in the Venturi tower, extending the spiral flow path of the dust-containing gas in the Venturi tower, so that the dust-containing gas is fully in contact with the water mist sprayed by the spray device, and the particulate matter in the dust-containing gas is captured by the water mist, thereby improving the dust removal efficiency.

[0022] 2. A demister is provided on the top of the Venturi tower, which is connected to the Venturi tower through an exhaust pipe, and the exhaust pipe is arranged inside the Venturi tower, so that the entire dust removal device has a compact structure and reduces the occupied space of the dust removal device.

[0023] 3. The present invention reasonably designs the shapes of the guide air intake pipe and the air intake cover, so that most of the dust-containing gas enters the Venturi tower as close to the inner wall of the Venturi tower as possible, further extending the spiral flow path of the dust-containing gas in the Venturi tower, so that the dust-containing gas fully contacts the water mist sprayed by the spray device. In addition, the guide air intake pipe, the air intake cover and the Venturi tower have simple structures and are easy to maintain.

[0024] 4. The Venturi tower includes a cylindrical body and a conical guide cover, so that the flow velocity at the bottom of the Venturi tower is greater than the flow velocity at the top of the Venturi tower, and the pressure at the bottom of the Venturi tower is less than the pressure at the top of the Venturi tower, thereby increasing the flow velocity of the dust-laden gas and thus improving the dust removal efficiency.

[0025] 5. The present invention filters the dust-containing sewage in the water tank by setting a filter box and a water pump, recovers and reuses the water in the water purification area, and realizes the recycling of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the internal structure of the wet dust removal device of the present invention;

[0027] Figure 2 is a schematic diagram of a wet dust removal device of the present invention at a first viewing angle;

[0028] Figure 3 A schematic diagram of a wet dust removal device of the present invention at a second viewing angle;

[0029] Figure 4 A schematic diagram of a wet dust removal device of the present invention at a third viewing angle;

[0030] Figure 5 yes Figure 4 Cross-sectional view at the AA surface;

[0031] Figure 6 It is a schematic diagram of the internal structure of the water tank and the filter box of the present invention;

[0032] Figure 7 It is a schematic structural diagram of the guide air intake pipe and the air intake cover of the present invention;

[0033] The implementation, functional features and advantages of the present invention will be further described in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The features of the present invention and other related features are further described in detail below through embodiments to facilitate understanding by those skilled in the art:

[0035] Reference Figure 1-7 , an embodiment of the wet dust removal device of the present invention is proposed:

[0036] A wet dust removal device includes a Venturi tower 1, a demister 2 located at the top of the Venturi tower 1, and a water tank 3 connected to the bottom of the Venturi tower 1. A guide air inlet pipe 4 is provided on the outer surface of the Venturi tower 1 near the top, and the guide air inlet pipe 4 is used to transport the dust-containing gas into the Venturi tower 1 in a tangential direction to the inner wall of the Venturi tower 1. A spray device 5 and an exhaust pipe 11 extending vertically downward are provided at the top of the inner cavity of the Venturi tower 1. The upper pipe mouth of the exhaust pipe 11 is connected to the demister 2, the inner wall of the Venturi tower 1 is used to guide the dust-containing gas to spiral downward around the exhaust pipe 11, the spray device 5 is used to spray the dust-containing gas, the exhaust pipe 11 is used to transport the gas after spraying and dust removal to the demister 2, and the water tank 3 is used to collect dust-containing sewage.

[0037] like Figure 5As shown, one end of the guide air inlet pipe 4 connected to the Venturi tower 1 is an oblique arc opening 41, which fits the arc surface of the Venturi tower 1 and is not opposite to the exhaust pipe 11, so as to prevent dust-containing gas from being blown onto the outer surface of the exhaust pipe 11.

[0038] like Figure 3-5 As shown, the guide air intake pipe 4 is located in front of the Venturi tower 1, and the guide air intake pipe 4 extends backward to form a tube body structure with asymmetric length on the left and right. The guide air intake pipe 4 extends in the horizontal direction of the front and back, so that the guide air intake pipe 4 transports the dust-containing gas into the Venturi tower 1 in the horizontal direction, avoiding the dust-containing gas from being transported obliquely into the Venturi tower 1. Since the gas in the Venturi tower 1 can only be output from the Venturi tower 1 from the lower end of the exhaust pipe 11, if the dust-containing gas is transported upward obliquely to the dust-containing gas inclination, it will cause the gas in the Venturi tower 1 to flow disorderly, affecting the dust removal efficiency. If the dust-containing gas is transported downward obliquely to the dust-containing gas inclination, it will cause the dust-containing gas to stay in the Venturi tower 1 for a short time, so that the water mist cannot fully contact the dust-containing gas, so the present invention preferably transports the dust-containing gas into the Venturi tower 1 in the horizontal direction through the guide air intake pipe 4.

[0039] The side 42 of the guide air inlet pipe with a longer length is tangent to the tower wall of the venturi tower 1, and the side 43 of the guide air inlet pipe with a shorter length is closer to the exhaust pipe 11 than the side 42 of the guide air inlet pipe with a longer length. The dust-laden gas output from the side 42 of the guide air inlet pipe with a longer length is closer to the inner wall of the venturi tower 1, and the dust-laden gas has a longer spiral flow path, which can be more fully contacted with the water mist.

[0040] like Figure 7 As shown, an air intake hood 6 is connected to the end of the guide air intake pipe 4 opposite to the oblique arc opening 41, and an air intake port 61 is provided at the end of the air intake hood 6 opposite to the guide air intake pipe 4. The distance between the air intake port 61 and the longer side 42 of the guide air intake pipe is shorter than the distance between the air intake port 61 and the shorter side 43 of the guide air intake pipe. The shorter the distance, the greater the flow rate of the dust-laden gas and the smaller the pressure. The longer the distance, the smaller the flow rate of the dust-laden gas and the greater the pressure. Under the action of the pressure difference, most of the dust-laden gas will enter the Venturi tower 1 from the longer side 43 of the guide air intake pipe, so that the transported dust-laden gas is as close to the inner wall of the Venturi tower 1 as possible.

[0041] The wet dust removal device is provided with two Venturi towers 1 along the left and right directions, each Venturi tower 1 is provided with a guide air intake pipe 4, the two guide air intake pipes 4 are symmetrical on the left and right, the two guide air intake pipes 4 are connected to the same air intake hood 6, and the width of the air intake hood 6 gradually increases from the air inlet 61 toward the guide air intake pipe 4.

[0042] The present invention reasonably designs the shapes of the guide air intake pipe 4 and the air intake cover 6, so that most of the dust-containing gas enters the Venturi tower 1 as close to the inner wall of the Venturi tower 1 as possible, further extending the spiral flow path of the dust-containing gas in the Venturi tower 1, so that the dust-containing gas is fully in contact with the water mist sprayed by the spray device 5. In addition, the guide air intake pipe 4, the air intake cover 6, and the Venturi tower 1 have simple structures and are easy to maintain.

[0043] like Figure 3 As shown, the venturi tower 1 includes a cylindrical body 12 and a conical flow guide hood 13. The upper end opening of the conical flow guide hood 13 is larger than the lower end opening of the conical flow guide hood 13. The upper end of the conical flow guide hood 13 is connected to the cylindrical body 12, and the lower end of the conical flow guide hood 13 is connected to the water tank 3 through a wastewater pipe 14; so that the flow velocity at the bottom of the venturi tower 1 is greater than the flow velocity at the top of the venturi tower, and the pressure at the bottom of the venturi tower 1 is less than the pressure at the top of the venturi tower, thereby increasing the flow velocity of the dust-laden gas and thus improving the dust removal efficiency.

[0044] like Figure 6 As shown, a filter box 7 is provided on one side of the water tank 3, and the filter box 7 is divided into a filter area 71 and a water purification area 72. A plurality of filter screens 73 are provided in the filter area 71, and the filter area 71 is connected to the water tank 3 through a sewage channel 74. The filter screens 73 filter the dust-containing sewage in the water tank 3, and the filtered water flows to the water purification area 72. The wet dust removal device also includes a water pump 75, which is used to transport the water in the water purification area 72 to the spray device 5, so that the water is recycled, and the gas not output from the demister 2 will be circulated back to the Venturi tower 1 for dust removal again.

[0045] A guide slope 31 inclined toward the filter box 7 is provided at the bottom of the water tank 3 to ensure that the dust-containing sewage flows smoothly into the filter box 7 and reduce the dust-containing sewage being retained in the water tank 3.

[0046] like Figure 5 As shown, the spray device 5 includes an annular water pipe 51 located in the Venturi tower 1, a water inlet pipe 52 for connecting the annular water pipe and the output end of the water pump 75, and a plurality of water mist nozzles 53 are evenly arranged at the bottom of the annular water pipe 51, which can form uniform water mist in the Venturi tower 1.

[0047] like Figure 1 As shown, the demister 2 includes a demister box 21, in which a water-absorbing filler is provided to absorb water vapor from the gas. A water vapor port 23 connected to the exhaust pipe 11 is provided at the bottom of the demister box 21. An exhaust port 24 is provided at the top of the demister box 21, and an air pump is provided at the exhaust port 24. The water-absorbing filler is located between the water vapor ports to ensure that the gas needs to pass through the water-absorbing filler before it can be discharged from the exhaust port.

[0048] like Figure 2As shown, a box opening is provided on the side of the demister box 21, and a sliding box door is provided at the box opening. When the wet dust removal device is working, the sliding box door is closed. When the water-absorbing filler needs to be replaced, the sliding box door is opened. A plurality of material boxes 22 for placing water-absorbing fillers are provided in the demister box 21. The top of the material box 22 is open and the bottom is ventilated.

[0049] The dust removal process of the present invention is as follows: first, under the action of the vacuum pump, the inside of the Venturi tower 1 is under negative pressure, and the dust-containing gas enters the wet dust removal device from the air inlet 61. The dust-containing gas passes through the air inlet hood 6 and the guide air inlet pipe 4 in turn, so that the dust-containing gas is transported to the Venturi tower 1 in a tangential direction to the inner wall of the Venturi tower 1. Since the diameter width at the bottom of the Venturi tower 1 is smaller and the diameter width at the top of the Venturi tower 1 is larger, the pressure at the bottom of the Venturi tower 1 is smaller and the pressure at the top of the Venturi tower 1 is larger. Under the action of the pressure difference, the dust-containing gas flows downward, and the inner wall of the Venturi tower 1 changes the horizontal flow direction of the dust-containing gas. In summary, the dust-containing gas flows downward in a spiral around the exhaust pipe 11. Figure 1 The arrows in the figure indicate the flow direction of the gas in the wet dust removal device. The spray device 5 at the top of the Venturi tower 1 sprays water mist. Under the action of gravity, the water mist moving downward will fully contact the dust-containing gas spiraling downward, and the water mist captures the particulate matter in the dust-containing gas. The water mist containing the dissolved particulate matter falls into the water tank 3 under the action of gravity, and the dust-removed gas leaves the Venturi tower 1 through the exhaust pipe 11 and reaches the demister 2. The water-absorbing filler in the demister 2 dries the gas and finally discharges it from the exhaust port. The dust-containing wastewater in the water tank 3 flows to the filter box 7 under the action of the guide slope 31, and the filtered water is returned to the spray device 5 by the water pump 75.

[0050] The preferred embodiments do not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A wet dust removal device, characterized in that: The invention comprises a venturi tower (1), a demister (2) located at the top of the venturi tower (1), and a water tank (3) connected to the bottom of the venturi tower (1); a guide air inlet pipe (4) is provided on the outer side surface of the venturi tower (1) near the top, and the guide air inlet pipe (4) is used to transport dust-containing gas into the venturi tower (1) in a tangential direction to the inner wall of the venturi tower (1); a spray device (5) and an exhaust pipe (11) extending vertically downward are provided at the top of the inner cavity of the venturi tower (1); the upper pipe mouth of the exhaust pipe (11) is connected to the demister (2); the inner wall of the venturi tower (1) is used to guide the dust-containing gas to spiral downward around the exhaust pipe (11); the spray device (5) is used to spray the dust-containing gas; the exhaust pipe (11) is used to transport the gas after spraying and dust removal to the demister (2); and the water tank (3) is used to collect dust-containing sewage.

2. A wet dust removal device according to claim 1, characterized in that: One end of the guide air intake pipe (4) connected to the Venturi tower (1) is an oblique arc opening (41), the oblique arc opening (41) is in contact with the arc surface of the Venturi tower (1), and the oblique arc opening (41) is not opposite to the exhaust pipe (11).

3. A wet dust removal device according to claim 2, characterized in that: The guide air intake pipe (4) is located in front of the Venturi tower (1), and the guide air intake pipe (4) extends backward to form a pipe body structure with asymmetric length on the left and right sides. The longer side of the guide air intake pipe (4) is tangent to the tower wall of the Venturi tower (1), and the shorter side of the guide air intake pipe (4) is closer to the exhaust pipe (11) than the longer side of the guide air intake pipe (4).

4. A wet dust removal device according to claim 3, characterized in that: An air intake hood (6) is connected to the end of the air intake pipe opposite to the oblique arc opening (41), and an air intake port (61) is provided at the end of the air intake hood (6) opposite to the air intake pipe, wherein the distance between the air intake port (61) and the longer side of the guide air intake pipe (4) is shorter than the distance between the air intake port (61) and the shorter side of the guide air intake pipe (4).

5. A wet dust removal device according to claim 4, characterized in that: Two Venturi towers (1) are arranged in the left-right direction, each Venturi tower (1) is provided with a guide air intake pipe (4), the two guide air intake pipes (4) are symmetrical to the left and right, the two guide air intake pipes (4) are connected to the same air intake hood (6), and the width of the air intake hood (6) gradually increases from the air inlet (61) toward the guide air intake pipe (4).

6. A wet dust removal device according to claim 1, characterized in that: The Venturi tower (1) comprises a cylindrical body (12) and a conical flow guide cover (13); the upper end opening of the conical flow guide cover (13) is larger than the lower end opening of the conical flow guide cover (13); the upper end of the conical flow guide cover (13) is connected to the cylindrical body (12); the lower end of the conical flow guide cover (13) is connected to the water tank (3) via a waste water pipe (14); the spray device (5) and the exhaust pipe (11) are both located in the cylindrical body (12).

7. A wet dust removal device according to claim 1, characterized in that: A filter box (7) is provided on one side of the water tank (3); the filter box (7) is divided into a filter area (71) and a water purification area (72); a plurality of filter screens (73) are provided in the filter area (71); the filter area (71) is connected to the water tank (3) via a sewage channel (74); the wet dust removal device further comprises a water pump (75); the water pump (75) is used to transport water in the water purification area (72) to the spray device (5).

8. A wet dust removal device according to claim 7, characterized in that: The inner bottom of the water tank (3) is provided with a flow guiding inclined surface (31) inclined toward the filter box (7).

9. A wet dust removal device according to claim 7, characterized in that: The spray device (5) comprises an annular water pipe (51) located in the Venturi tower (1), and a water inlet pipe (52) used for connecting the annular water pipe (51) and an output end of a water pump (75), and a plurality of water mist nozzles (53) are evenly arranged at the bottom of the annular water pipe (51).

10. A wet dust removal device according to claim 1, characterized in that: The demister (2) comprises a demister box (21), a water-absorbing filler is arranged in the demister box (21), a water vapor outlet (23) connected to the exhaust pipe (11) is arranged at the bottom of the demister box (21); an exhaust port (24) is arranged at the top of the demister box (21), and an exhaust fan is arranged at the exhaust port (24).

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