Anti-blocking venturi water washing tail gas treatment device

Abstract

The application provides a kind of anti-blocking venturi water washing tail gas treatment device, and relates to the field of tail gas wet treatment.The filter unit includes a filter pipe, which includes a water inlet pipe with side water inlet, a drain pipe located below, and a blowdown pipe located above the water inlet pipe.When the filter screen needs to be cleaned, the filtered liquid is made to flow in reverse by the backflushing mechanism.Due to the partial blockage of the filter screen, the liquid flow rate slows down, which can drive the sleeve to move upwards and be limited to a maximum value after moving upwards.The liquid continues to flow, which can impact the filter screen from below to above and be discharged from the blowdown pipe.Through such a design, the movement of the filter screen can be used to cover the water inlet pipe with the sleeve, backflushing of the filter screen is achieved, and the problem of inconvenient backflushing cleaning in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas wet treatment, specifically to an anti-clogging Venturi water washing exhaust gas treatment device. Background Technology

[0002] Commonly used wet waste gas treatment equipment in industry includes spray towers, packed towers, and cyclone towers. These devices mainly remove pollutants such as dust, acid mist, and soluble gases by having a sprayed scrubbing liquid come into contact with the waste gas.

[0003] The applicant's previous application disclosed a method for effectively mixing gas and liquid through pressurization using a venturi tube. This method atomizes the liquid, causing it to settle and converge, resulting in a greater amount of solids being separated. However, traditional sedimentation and suspension methods are insufficient for the secondary use of sprayed liquids. Because the solid particles in the gas decrease in size and become more evenly dispersed under high flow rates and liquid impact, a filtration device is needed for solid-liquid separation. Small solid particles can clog the filter unit. Traditional backwashing requires shutting off the normal water supply and switching the pipeline flow direction, which can lead to pipeline pressure fluctuations, unstable water pressure, and cross-contamination of clean and wastewater in some structures, affecting the continuity of normal water supply. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an anti-clogging Venturi scrubbing exhaust gas treatment device, which solves the problem of inconvenient filtration and backwashing mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a clogging-resistant Venturi scrubbing exhaust gas treatment device, comprising a primary separation tank, which includes a sedimentation separation tank and a flotation separation tank. The treated liquid flows into a filtration unit after passing through the sedimentation and flotation separation tanks. The filtration unit includes a filter pipe, which includes a side-mounted inlet pipe, a lower outlet pipe, and a sewage outlet pipe above the inlet pipe. A support ring is installed inside the filter pipe below the inlet pipe, and a filter bracket is slidably connected to the filter pipe above the support ring. A filter screen is installed at the top of the filter bracket. The filter pipe has an internal elastic sliding connection with a sealing gasket located between the inlet pipe and the drain pipe. Below the sealing gasket is a protrusion that abuts against the filter support to form a liquid flow space. The filter support includes a sleeve that is slidably connected inside the filter pipe. The top of the sleeve has an installation ring for installing the filter screen. The length of the sleeve is greater than the distance between the inlet pipe and the drain pipe. When the sealing gasket is moved to its limit position, the sleeve remains covering the inlet pipe. The drain pipe has a backflushing mechanism at its tail end. The backflushing mechanism drives the filter support to rise and backflushes the filter screen by reversing the flow of the filtered liquid, so that the filtered material is discharged through the drain pipe.

[0006] Preferably, the protrusion is an upper limit ring located below the sealing gasket, and the upper limit ring is fixedly connected to the filter pipe.

[0007] Preferably, the protrusion is a protrusion fixedly installed at the bottom of the sealing gasket, and the bottom end of the protrusion contacts the hard part on the upper surface of the filter bracket.

[0008] Preferably, the water inlet pipe is provided with a buffer chamber before being connected to the filter pipe, and a compression piston pad is elastically connected inside the buffer chamber.

[0009] Preferably, the backflushing mechanism includes a temporary storage chamber located at the end of the drain pipe, a valve for cutting off the liquid pipeline is provided between the temporary storage chamber and the drain pipe, and a pump for pumping water from the temporary storage chamber into the drain pipe, wherein the valve is closed before the pump operates.

[0010] Preferably, the backflushing mechanism includes a sliding cavity disposed at the tail end of the drain pipe, the volume of the sliding cavity being larger than the volume of the filter pipe, a passive sealing end being elastically slidably connected to the side of the sliding cavity near the liquid inlet direction, and an active sealing end being slidably connected thereto, both the active sealing end and the passive sealing end being provided with through holes, a covering part covering the through holes of each other, and a driving unit for driving the active sealing end to move and squeeze the active sealing end to fit with the passive sealing end, and a discharge outlet with a diameter smaller than that of the drain pipe is provided at the tail end of the sliding cavity.

[0011] Preferably, the backflushing mechanism includes a sliding cavity disposed at the tail end of the drain pipe. The volume of the sliding cavity is larger than the volume of the filter pipe. A piston is disposed inside the sliding cavity. When the piston is contracted, the side wall of the sliding cavity near the water inlet end is provided with an outlet.

[0012] Preferably, the liquid outflow point of the sedimentation separation tank is located above the middle of the sedimentation separation tank, and the liquid outflow point of the flotation separation tank is located below the middle of the flotation separation tank. No reagents are added to either the flotation separation tank or the sedimentation separation tank.

[0013] Preferably, flocculants are added to the sedimentation separation tank for sedimentation, and flotation agents are added to the flotation separation tank for flotation.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This anti-clogging Venturi scrubbing exhaust gas treatment device pre-separates liquid into two stages of impurities before it enters the filter pipe through the inlet pipe. The liquid is then filtered through a filter screen, and the filtered liquid is discharged through a drain pipe. When cleaning the filter screen is required, a backflushing mechanism reverses the flow of the filtered liquid. Because the filter screen is partially clogged, the liquid flow slows down, causing the sleeve to move upwards. After moving upwards, the sleeve is limited to its maximum movement, while the liquid continues to flow. This allows the filtered material to be separated from the filter screen from bottom to top and discharged through the drain pipe. This design utilizes the movement of the filter screen in conjunction with the sleeve covering the inlet pipe to achieve backflushing of the filter screen, solving the problem of inconvenient backflushing cleaning in existing technologies.

[0015] 2. In this anti-clogging Venturi scrubbing exhaust gas treatment device, the sliding chamber forms a sealed space due to the continuous advancement of the active sealing end, causing the liquid pressure to gradually increase under compression. This forces the high-pressure liquid to flow back into the filter pipe along its original flow path. The passive sealing end, under liquid pressure, experiences slight compression in its elastic connection structure, ensuring that the backwash pressure is concentrated on the filter screen. The reverse-flowing liquid carries the impurities trapped by the filter and moves rapidly along the filter pipe towards the drain pipe, achieving efficient rinsing of the filter screen.

[0016] 3. This anti-clogging Venturi scrubbing exhaust gas treatment device, under suitable operating conditions, such as when this part only filters liquids, simply limits the movement range of the filter screen by setting an upper limit ring, thus avoiding the problem of failing to discharge sewage due to exceeding the drain pipe.

[0017] 4. The anti-clogging Venturi scrubbing exhaust gas treatment device has a buffer chamber before the water inlet pipe is connected to the filter pipe. The buffer chamber is elastically connected to a squeeze piston pad. When the water inlet pipe is temporarily closed, the treatment liquid continues to increase. By setting up the buffer chamber, the treatment liquid can be temporarily stored. When the water inlet pipe is reopened, the stored liquid can be discharged under the action of the elastic part of the squeeze piston pad. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the temporary storage cavity connection of the present invention; Figure 3 This is a schematic diagram of the passive sealing end connection of the present invention; Figure 4 This is a schematic diagram of the buffer cavity connection of the present invention; Figure 5 This is a schematic diagram of the sealing gasket connection of the present invention; Figure 6 This is a half-sectional schematic diagram of the filter pipe of the present invention; Figure 7This is a schematic diagram of the filter support connection of the present invention.

[0019] In the diagram: 1. Primary separation tank; 101. Sedimentation separation tank; 102. Floating separation tank; 2. Filtration unit; 201. Filtration pipe; 202. Inlet pipe; 203. Drain pipe; 204. Support ring; 25. Filter bracket; 206. Filter screen; 207. Sealing gasket; 28. Protrusion; 209. Drain pipe; 251. Sleeve; 252. Mounting ring; 3. Backflushing mechanism; 281. Upper limit ring; 282. Protrusion; 4. Buffer chamber; 5. Squeezing piston pad; 301. Temporary storage chamber; 302. Valve; 303. Pump; 304. Sliding chamber; 305. Passive sealing end; 306. Active sealing end; 307. Through hole; 308. Cover part; 309. Drive unit; 310. Discharge port; 311. Piston part. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0024] like Figure 1-7 As shown, an anti-clogging Venturi scrubbing exhaust gas treatment device includes a primary separation tank 1, which comprises a sedimentation separation tank 101 and a flotation separation tank 102. The treated liquid flows into a filtration unit 2 after passing through the sedimentation separation tank 101 and the flotation separation tank 102. The sedimentation separation tank 101 separates impurities with a density greater than the liquid, while the flotation separation tank 102 separates impurities with a density less than the liquid. The liquid outflow point of the sedimentation separation tank 101 is located above the middle of the sedimentation separation tank 101, and the liquid outflow point of the flotation separation tank 102 is located below the middle of the flotation separation tank 102. No reagents are added to either the flotation separation tank 102 or the sedimentation tank 101. As shown in the figure, this additive-free natural filtration method avoids introducing new substances that could affect the recycling of the liquid.

[0025] The filter unit 2 includes a filter pipe 201, which includes a side-mounted water inlet pipe 202, a lower drain pipe 209, and a sewage pipe 203 above the water inlet pipe 202. Inside the filter pipe 201, below the water inlet pipe 202, a support ring 204 is provided. Above the support ring 204, a filter bracket 25 is slidably connected to the filter pipe 201. A filter screen 206 is provided at the top of the filter bracket 25. A sealing gasket 207 is elastically slidably connected inside the filter pipe 201. A return spring is connected between the sealing gasket 207 and the top of the filter pipe 201. The sealing gasket 207 is located between the water inlet pipe 202 and the drain pipe 203. The function of the sealing gasket 207 is to restrict the upward flow of liquid. A protrusion 28 is provided below the sealing gasket 207 to abut against the filter support 25 to form a liquid flow space. When the sealing gasket 207 moves upward, the presence of the protrusion 28 prevents the filter screen 206 from directly contacting the sealing gasket 207. In this way, the filter material above the filter screen 206 can be discharged through the drain pipe 203. The filter support 25 includes a sleeve 251 slidably connected inside the filter pipe 201. The top end of the sleeve 251 is provided with an installation ring 252 for installing the filter screen 206. The length of the sleeve 251 is greater than the distance between the inlet pipe 202 and the drain pipe 203. When the sealing gasket 207 moves to the limit position, the function of the sleeve 251 is to cover the inlet pipe 202 to prevent liquid from flowing back from the inlet pipe 202. The sleeve 251 keeps covering the inlet pipe 202. The tail end of the drain pipe 209 is provided with a backflushing mechanism 3. The backflushing mechanism 3 drives the filter support 25 to rise and backflushe the filter screen 206 so that the filtered material is discharged through the drain pipe 203 by reversing the flow of the filtered liquid.

[0026] In this embodiment, the liquid undergoes two-stage impurity separation before entering the filter pipe 201 through the inlet pipe 202 and is filtered through the filter screen 206. The filtered liquid is then discharged through the drain pipe 209. When the filter screen 206 needs to be cleaned, the backflushing mechanism 3 reverses the flow of the filtered liquid. Since the filter screen 206 is partially blocked, the liquid flow speed slows down, which drives the sleeve 251 to move upward. After moving upward, the maximum movement is limited, and the liquid continues to flow. This allows the filtered material to be separated from the filter screen 206 from bottom to top and discharged through the drain pipe 203. This design utilizes the movement of the filter screen 206 in conjunction with the sleeve 251 covering the inlet pipe 202 to achieve backflushing of the filter screen 206, solving the problem of impurities flowing back during backflushing cleaning in the prior art.

[0027] The protrusion 28 is a protrusion 282 fixedly installed at the bottom of the sealing gasket 207. The bottom end of the protrusion 282 contacts the hard part on the upper surface of the filter bracket 25. This arrangement can keep the sealing gasket 207 rising synchronously with the filter screen 206, and limit the position of the filter screen 206 by the extreme position of the sealing gasket 207.

[0028] Before the water inlet pipe 202 is connected to the filter pipe 201, a buffer chamber 4 is provided. The buffer chamber 4 is elastically connected to a squeeze piston pad 5. When the water inlet pipe 202 is temporarily closed, the processing liquid continues to increase. By setting the buffer chamber 4, the processing liquid can be temporarily stored. When the water inlet pipe 202 is reopened, the stored liquid can be discharged under the action of the elastic part of the squeeze piston pad 5.

[0029] The backflushing mechanism 3 includes a temporary storage chamber 301 located at the end of the drain pipe 209. A valve 302 is provided between the temporary storage chamber 301 and the drain pipe 209 to cut off the liquid pipeline. A pump 303 is provided to pump water from the temporary storage chamber 301 into the drain pipe 209. Before the pump 303 starts working, the valve 302 is closed first. The flushing efficiency depends on the power of the pump 303. However, this technical solution is simple in structure and easy to implement.

[0030] In Example 2, the protrusion 28 is an upper limit ring 281 located below the sealing gasket 207. The upper limit ring 281 is fixedly connected to the filter pipe 201. In this example, the water level is assumed to never exceed the drain pipe 203. At the same time, the gas and liquid have already been separated in the previous work. This part only filters the liquid, thus eliminating the need for the sealing gasket 207 structure. The upper limit ring 281 is simply used to limit the movement range of the filter screen 206, preventing it from exceeding the drain pipe 203 and causing the problem of sewage not being discharged.

[0031] The backwash mechanism 3 includes a sliding cavity 304 located at the tail end of the drain pipe 209. The volume of the sliding cavity 304 is larger than the volume of the filter pipe 201. By limiting the volume, sufficient liquid can be used for backwashing. Inside the sliding cavity 304, a passive sealing end 305 is elastically slidably connected to the side near the liquid inlet direction, and an active sealing end 306 is slidably connected to it. Both the active sealing end 306 and the passive sealing end 305 are provided with through holes 307 and a covering part 308 covering the through holes 307 of each other. When the passive sealing end 305 and the active sealing end 306 are not in contact, the liquid can flow out through the through holes 307, so that there will be no large resistance to the liquid flow. The mechanism also includes a drive unit 309 that drives the active sealing end 306 to move and squeeze the active sealing end 306 to contact the passive sealing end 305. The tail end of the sliding cavity 304 is provided with an outlet 310 with a diameter smaller than that of the drain pipe 209. When backflushing is required, the drive unit 309 moves the active sealing end 306 until it comes into contact with the passive sealing end 305, and continues to move forward, thereby enabling the liquid to flow in the reverse direction. At this time, the sliding cavity 304 forms a sealed space due to the continuous advancement of the active sealing end 306, and the liquid pressure gradually increases under the squeezing action. This forces the high-pressure liquid to flow back into the filter pipe 201 along the original flow path. Under the action of liquid pressure, the passive sealing end 305's elastic connection structure generates a slight compression, ensuring that the backwash pressure is concentrated on the filter screen 206. The reverse-flowing liquid carries the impurities trapped by the filter and moves quickly along the filter pipe 201 towards the drain pipe 203, achieving efficient rinsing of the filter screen 206. After rinsing, the drive unit 309 drives the active sealing end 306 to reset, and the passive sealing end 305 returns to its initial position under the action of elastic force. The through hole 307 is reopened, and the liquid returns to its normal flow state.

[0032] The sedimentation separation tank 101 is filled with flocculant for sedimentation, and the flotation separation tank 102 is filled with flotation agent for flotation. By adding reagents, the separation of solids and liquids can be achieved quickly without affecting the properties of the liquid.

[0033] In embodiment 3, the backflushing mechanism 3 includes a sliding cavity 304 disposed at the tail end of the drain pipe 209. The volume of the sliding cavity 304 is larger than the volume of the filter pipe 201. A piston part 311 is disposed inside the sliding cavity 304. When the piston part 311 is contracted, the side wall of the sliding cavity 304 near the water inlet end is provided with an outlet 310. In this embodiment, the active sealing end 306, the passive sealing end 305 and the drive unit 309 are combined into the piston part 311, and the outlet 310 is limited to being located in front of the piston part 311 and on the side wall of the sliding cavity 304. Backflushing can be achieved relatively simply. However, the outlet 310 can only be disposed on the side wall. Compared with the outlet 310 disposed at the bottom end, the bottom straight-through outlet 310 is a straight up and down guiding path. The fluid flows in the direction of gravity, with small pressure drop and fast flow rate. The side wall type does not have the above advantages.

[0034] Meanwhile, the piston part 311 is continuously subjected to water flow impact and small-scale friction, which increases wear. However, the active sealing end 306 and passive sealing end 305 in the previous embodiment can pass through liquid, which reduces the wear of this part.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0036] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A clogging-resistant Venturi scrubbing exhaust gas treatment device, comprising a primary separation tank (1), characterized in that: The primary separation tank (1) includes a sedimentation separation tank (101) and a flotation separation tank (102). The treated liquid flows into the filtration unit (2) after passing through the sedimentation separation tank (101) and the flotation separation tank (102). The filter unit (2) includes a filter pipe (201), which includes a water inlet pipe (202) for side water inlet, a drain pipe (209) located below, and a sewage pipe (203) located above the water inlet pipe (202). Inside the filter pipe (201), below the water inlet pipe (202), a support ring (204) is provided. Above the support ring (204), a filter bracket (25) is provided that is slidably connected to the filter pipe (201). A filter screen (206) is provided at the top of the filter bracket (25). The filter pipe (201) is internally elastically slidably connected with a sealing gasket (207). The sealing gasket (207) is located between the water inlet pipe (202) and the sewage pipe (203). A protrusion (28) is provided below the sealing gasket (207) to abut against the filter support (25) to form a liquid flow space. The filter support (25) includes a sleeve (251) slidably connected inside the filter pipe (201). The top end of the sleeve (251) is provided with an installation ring (252) for installing the filter screen (206). The length of the sleeve (251) is greater than the distance between the water inlet pipe (202) and the sewage pipe (203). When the sealing gasket (207) is moved to the limit position, the sleeve (251) remains covering the water inlet pipe (202). The drain pipe (209) is provided with a backflushing mechanism (3) at the end. The backflushing mechanism (3) drives the filter support (25) to rise and backflushe the filter screen (206) by reversing the flow of the filtered liquid so that the filtered material is discharged through the drain pipe (203).

2. The anti-clogging Venturi scrubbing exhaust gas treatment device according to claim 1, characterized in that: The protrusion (28) is an upper limit ring (281) located below the sealing gasket (207), and the upper limit ring (281) is fixedly connected to the filter pipe (201).

3. The anti-clogging Venturi scrubbing exhaust gas treatment device according to claim 1, characterized in that: The protrusion (28) is a protrusion (282) fixedly installed at the bottom of the sealing gasket (207), and the bottom of the protrusion (282) contacts the hard part on the upper surface of the filter bracket (25).

4. A clogging-resistant Venturi scrubbing exhaust gas treatment device according to claim 2 or 3, characterized in that: The water inlet pipe (202) is provided with a buffer chamber (4) before it is connected to the filter pipe (201), and the buffer chamber (4) is elastically connected with a compression piston pad (5).

5. The anti-clogging Venturi scrubbing exhaust gas treatment device according to claim 4, characterized in that: The backflushing mechanism (3) includes a temporary storage chamber (301) at the end of the drain pipe (209), a valve (302) for cutting off the liquid pipeline is provided between the temporary storage chamber (301) and the drain pipe (209), and a pump (303) for pumping water from the temporary storage chamber (301) to the drain pipe (209). The valve (302) is closed before the pump (303) starts working.

6. The anti-clogging Venturi scrubbing exhaust gas treatment device according to claim 4, characterized in that: The backflushing mechanism (3) includes a sliding cavity (304) provided at the tail end of the drain pipe (209). The volume of the sliding cavity (304) is larger than the volume of the filter pipe (201). The sliding cavity (304) is elastically slidably connected to a passive sealing end (305) on the side near the liquid inlet direction, and to an active sealing end (306). Both the active sealing end (306) and the passive sealing end (305) are provided with through holes (307), and a covering part (308) covering the through holes (307) of the other, and a driving unit (309) for driving the active sealing end (306) to move and squeeze the active sealing end (306) to fit with the passive sealing end (305). The tail end of the sliding cavity (304) is provided with an outlet (310) with a diameter smaller than that of the drain pipe (209).

7. The anti-clogging Venturi scrubbing exhaust gas treatment device according to claim 4, characterized in that: The backwash mechanism (3) includes a sliding cavity (304) located at the end of the drain pipe (209). The volume of the sliding cavity (304) is larger than the volume of the filter pipe (201). A piston part (311) is provided inside the sliding cavity (304). When the piston part (311) contracts, the side wall of the sliding cavity (304) near the water inlet is provided with an outlet (310).

8. A clogging-resistant Venturi scrubbing exhaust gas treatment device according to any one of claims 5-7, characterized in that: The liquid outflow position of the sedimentation separation tank (101) is located above the middle of the sedimentation separation tank (101), and the liquid outflow position of the floating separation tank (102) is located below the middle of the floating separation tank (102). No reagents are added to either the floating separation tank (102) or the sedimentation separation tank (101).

9. A clogging-resistant Venturi scrubbing exhaust gas treatment device according to any one of claims 5-7, characterized in that: The sedimentation separation tank (101) is filled with flocculant for sedimentation, and the flotation separation tank (102) is filled with flotation agent for flotation.

Images