Falling film dust removal device

Abstract

The utility model discloses a falling film dust removal device. The falling film dust removal device comprises a first water film dust remover, a second water film dust remover, a settling bin and an air inducing device, an air inlet is formed in the first water film dust remover, an air outlet is formed in the second water film dust remover, and the air inducing device is arranged at the air outlet; the first water film dust remover and the second water film dust remover are both communicated with the settling bin, and a slag discharging opening is formed in the settling bin; spraying devices are respectively arranged at the inner tops of the first water film dust remover and the second water film dust remover. The flue gas treatment device is compact in structure, small in occupied area, large in treatment capacity and capable of fully treating fine powder with small particles and small mass in flue gas and directly discharging the fine powder.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal devices, in particular to a falling film dust removal device. Background Art

[0002] Dust generated by operations such as solid material crushing, screening and conveying, and smoke generated by processes such as material combustion, melting, and chemical reactions are usually treated with flue gas dust removal devices or gas purification systems to capture and recover particulate matter in the dust-containing gas so that the flue gas meets emission standards. In the prior art, dust-containing gas treatment equipment can be divided into mechanical dust collectors, washing wet dust collectors, filtering dust collectors, electrostatic precipitators, and sonic dust collectors. Among them, washing wet dust collectors include spray-type scrubbers, cyclone water film scrubbers, packed tower scrubbers, etc. This type of dust collector has a simple structure and low cost of use, but the particle removal effect is poor.

[0003] In recent years, there have been research and developments that use water film to remove dust. For example, a Chinese patent discloses a spray film dust collector, which consists of an exhaust water sprayer with a water jacket, water spray holes and an exhaust channel, a cyclone separation cylinder and a dust collection cylinder. The purpose of dust removal is achieved by combining air flow, dust flow and water flow to form a rotating spray film process. However, in actual applications, this device has a small processing capacity and an unsatisfactory processing effect. The Chinese patent with application number 202320973299.3 discloses a water film dust removal device, which generates water mist to increase the mass and particle size of dust. A water distribution pipe and an overflow trough are set in the water film dust collector so that the water overflowing from the overflow trough can form a water film on the inner wall of the dust collector body, and a pressure block is set below the dust collector body to ensure the verticality of the dust collector body, and a spray layer is set to enhance the dust removal effect. The dust removal principle is: the dust-containing flue gas enters the cylindrical cylinder at a high flow rate from the induced draft fan, forming a violently rotating upward airflow. Under the centrifugal force generated by the rotating airflow, the ash particles are thrown to the inner wall of the cylinder, and the uniform water film flowing from top to bottom is formed with the water supply device on the upper part of the dust removal device to produce infiltration, adhesion and collection. With the water flow, the ash particles flow into the conical ash hopper, pass through the water seal below and discharge the ash to the sedimentation tank, and the clean flue gas is discharged from the outlet on the upper part of the dust collector. However, the dust removal process mainly uses centrifugal force to separate particles, and it cannot achieve a good treatment effect for fine powder with small particles and small mass, and the actual dust removal effect is still relatively poor. Therefore, the utility model aims to develop a falling film dust removal device to better meet actual needs. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a falling film dust removal device to solve the shortcomings of the above-mentioned background technology.

[0005] The technical problem solved by the utility model is achieved by the following technical solutions:

[0006] A falling film dust removal device comprises a first water film dust collector, a second water film dust collector, a sedimentation bin and an induced draft device; the first water film dust collector is provided with an air inlet, the second water film dust collector is provided with an exhaust port, and the induced draft device is provided at the exhaust port; the first water film dust collector and the second water film dust collector are both connected to the sedimentation bin, and a slag discharge port is provided on the sedimentation bin; spray devices are respectively provided on the top of the first water film dust collector and the second water film dust collector.

[0007] The utility model also includes a buffer tank, which is connected to the sedimentation bin and the spraying device.

[0008] In the utility model, a liquid discharge port is arranged at the middle and upper part of the sedimentation bin, and the liquid discharge port is connected to the buffer tank through a connecting pipe.

[0009] In the utility model, the buffer tank is connected with the spray device through a water pump.

[0010] In the utility model, a water replenishing device is arranged in the buffer tank, and the water replenishing device comprises a float valve and a water replenishing pipe.

[0011] In the utility model, the sedimentation bin is a conical bin with inclined side plates arranged on the side, and the slag discharge port is arranged at the bottom of the sedimentation bin.

[0012] In the utility model, a plurality of vertically arranged falling film tubes are arranged in the first water film dust collector and the second water film dust collector.

[0013] In the utility model, a wire mesh demister is arranged on the top of the spray device in the second water film dust collector.

[0014] Beneficial effects: The falling film dust removal device described in the utility model has a large processing capacity and is easy to operate. Through secondary water film dust removal combined with sedimentation, small particles and small-mass fine powder in the flue gas can be fully removed. The treated flue gas can be directly discharged, which is suitable for industrial production.

[0015] The falling film dust removal device described in the utility model has a compact structure, occupies a small space, has low equipment processing or purchase costs, and the spraying water can be recycled, which can further reduce the processing cost and has good practical promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a preferred embodiment of the utility model.

[0017] Among them: 1. First water film dust collector; 2. Air inlet; 3. Falling film pipe; 4. Spraying device; 5. Exhaust port; 6. Inducing device; 7. Wire mesh demister; 8. Sedimentation bin; 9. Slag discharge port; 10. Connecting pipe; 11. Buffer tank; 12. Water pump; 13. Float valve; 14. Second water film dust collector. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0019] See also Figure 1 As shown, the falling film dust removal device includes a first water film dust collector 1, a second water film dust collector 14, a sedimentation bin 8 and an induced draft device 6; the first water film dust collector 1 and the second water film dust collector 14 are arranged in parallel, wherein the first water film dust collector 1 is provided with an air inlet 2 at the top, and dust-containing flue gas enters from the air inlet 2, and the second water film dust collector is provided with an exhaust port 5 at the top, and the induced draft device 6 is arranged at the exhaust port 5. Preferably, the induced draft device 6 is an induced draft fan, which introduces the dust-containing flue gas from the first water film dust collector 1 into the second water film dust collector 14 for further treatment and then discharge.

[0020] The first water film dust collector 1 and the second water film dust collector 14 are both provided with a plurality of vertically arranged falling film tubes 3, and the tops of the falling film tubes 3 in the first water film dust collector 1 and the second water film dust collector are respectively provided with a spray device 4, the spray impact generated by the spray device 4 accelerates the falling of particles with larger particle size and self-weight in the dust-containing flue gas, and the water mist can increase the particle size and self-weight of smaller particles in the dust-containing flue gas, and a water film is formed in the falling film tube 3 through atomization spraying, and the flue gas passes through the first water film dust collector 1 and the second water film dust collector 14. When the falling film tube 3 in the first water film dust collector 1 is used, most of the dust particles collide with the inner wall of the falling film in the first water film dust collector 1, and the smoke particles are adsorbed in the water film. The water film carries the smoke into the sedimentation bin 8, and the remaining part of the smoke containing tiny particles enters the falling film tube 3 of the second water film dust collector 14 from bottom to top under the action of the induced draft device 6, collides with the inner wall of the falling film tube 3 of the second water film dust collector and is further adsorbed by the water film, so that the tiny particles in the smoke are fully removed. In a preferred embodiment, a wire mesh demister 7 is provided on the top of the spray device 4 in the second water film dust collector 14. The smoke that has been fully adsorbed by the water film can be directly discharged after further spraying and defoaming treatment at the top of the second water film dust collector 14.

[0021] In a preferred embodiment, the falling film tube 3 preferably adopts a stainless steel falling film tube with a matte material to ensure hydrophilicity, and the tube diameter is preferably 32-38 mm. Multiple falling film tubes 3 are arranged in parallel in the first water film dust collector 1 and the second water film dust collector 14. The inner wall of the falling film tube 3 has a rough surface, and the spray water containing smoke and dust forms a liquid film on the rough surface, which can achieve a more sufficient particle adsorption effect. To a certain extent, the higher the roughness of the inner wall of the falling film tube 3, the better the adsorption effect of smoke and dust particles.

[0022] like Figure 1As shown, the bottoms of the first water film dust collector 1 and the second water film dust collector 14 are both connected to the top of the sedimentation bin 8. The flue gas treated by the first water film dust collector 1 enters the sedimentation bin 8 with the spray water and settles in the sedimentation bin 8. The particles in the flue gas after settling are naturally settled and separated from the air. The air further enters the second water film dust collector 14 for treatment under the action of the induced draft fan. The particles in the flue gas treated by the second water film dust collector 14 are further washed by the spray device 4 and enter the sedimentation bin 8 for sedimentation. A slag discharge port 9 is provided at the bottom of the sedimentation bin 8, and the smoke dust that is naturally settled can be discharged regularly through the slag discharge port 9. In a preferred embodiment, the sedimentation bin 8 is a conical bin structure with inclined side panels on the side, and the inclined side panels are conducive to the full deposition and rapid discharge of dust particles.

[0023] A drain port is provided in the middle and upper part of the sedimentation bin 8, and the drain port is connected to the buffer tank 11 through a connecting pipe 10. The buffer tank 11 is connected to the spray device 4 through a water pump 12. Therefore, the supernatant after natural sedimentation in the sedimentation bin 8 enters the buffer tank 11 through the connecting pipe 10, and the clean water further provides spray water for the spray device 4 after further buffering and sedimentation in the buffer tank 11. Therefore, the spray water in the utility model can be recycled. In a preferred embodiment, a water replenishing device is provided in the buffer tank 11, and the water replenishing device includes a float valve 13 and a water replenishing pipe. The water replenishing pipe is connected to an external water tank, so that it can automatically replenish water according to the water level in the buffer chamber 11 to ensure sufficient supply of water for spraying.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.

[0027] The above contents are further detailed descriptions of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention.

Claims

1. A falling film dust removal device, characterized in that: The falling film dust removal device includes a first water film dust collector, a second water film dust collector, a sedimentation bin and an induced draft device; the first water film dust collector is provided with an air inlet, the second water film dust collector is provided with an exhaust port, and the induced draft device is provided at the exhaust port; the first water film dust collector and the second water film dust collector are both connected to the sedimentation bin, and a slag discharge port is provided on the sedimentation bin; spray devices are respectively provided on the top of the first water film dust collector and the second water film dust collector.

2. The falling film dust removal device according to claim 1, characterized in that: It also includes a buffer tank, which is connected to the sedimentation bin and the spraying device.

3. The falling film dust removal device according to claim 2, characterized in that: A drain port is arranged at the middle and upper part of the sedimentation bin, and the drain port is connected to the buffer tank through a connecting pipe.

4. The falling film dust removal device according to claim 2, characterized in that: The buffer tank is connected to the spray device through a water pump.

5. The falling film dust removal device according to claim 2, characterized in that: A water replenishing device is arranged in the buffer tank, and the water replenishing device comprises a float valve and a water replenishing pipe.

6. The falling film dust removal device according to claim 1, characterized in that: The sedimentation bin is a conical bin with inclined side panels on the sides, and the slag discharge port is arranged at the bottom of the sedimentation bin.

7. The falling film dust removal device according to claim 1, characterized in that: The first water film dust collector and the second water film dust collector are both provided with a plurality of vertically arranged falling film tubes.

8. The falling film dust removal device according to claim 1, characterized in that: A wire mesh demister is arranged on the top of the spray device in the second water film dust collector.

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