Mobile coal yard water film dust removal device

Abstract

A movable coal yard water film dust removal device comprises a movable trolley and a dust removal device, and the dust removal device is installed on the movable trolley and comprises a dust atomization part and a dust removal purification part. The dust atomization part comprises an air suction opening, an atomization chamber, a pressure pump and a water tank, the air suction opening is an inverted conical cavity, an air outlet diffusion opening is a conical cylinder with the diameter gradually enlarged, and the cylindrical atomization chamber is arranged between the air suction opening and the air outlet diffusion opening; a spray head, a first fluid director and a second fluid director are arranged in the atomizing chamber, the spray head is arranged at the left end of the atomizing chamber, and the spray head is connected to the water tank through a pressure pump. The two ends of the atomizing chamber are in butt joint together in a frustum shape, for the air inlet, the absorbing area for absorbing dust-containing airflow is enlarged, dust-containing air can be prevented from escaping, and treatment of polluted air is facilitated; the air outlet diffusion opening of the atomizing chamber is in a frustum shape with the diameter gradually enlarged, so that dust-containing air has a better atomizing and mixing effect, and a foundation is laid for dust filtration in the next stage.

Description

Technical Field

[0001] The invention relates to the field of separation technology, and in particular to a water film dust removal technology. Background Art

[0002] The coal transportation system is an important part of the thermal power generation system and is responsible for the operation of the power plant. The coal transportation system of the power plant is mainly composed of coal unloading, coal storage, transportation, screening and crushing, and auxiliary facilities. However, the coal transportation system is often accompanied by coal dust pollution.

[0003] During the unloading and transportation of coal, with the generation of dusty airflow, a large amount of floating dust caused by the blast effect will be raised, forming coal dust. Coal dust not only pollutes the environment, but also poses great harm to the health of operators. Dust particles will also accelerate the wear of machinery. However, in the process of unloading and transportation of coal, traditional dust collectors cannot fully wrap the dust particles in the flue gas due to uneven mixing when mixing the droplets with the coal dust. In addition, the contact time between the droplets and the flue gas is short, which may still cause free dust particles to still exist in the flue gas, and they cannot be completely filtered out in the dust filtration stage, and the dust removal efficiency is low.

[0004] The Chinese patent application number CN201720155683.7, entitled "A Venturi Scrubber for Syngas Dust Removal", discloses a technical solution, which includes a contraction chamber, a throat, an expansion chamber, and a gas-liquid separator; the top of the contraction chamber is an air inlet, in which an upper nozzle is installed, the bottom of the contraction chamber is connected to the throat, a lower nozzle is installed in the throat, and the bottom of the throat is connected to the top of the expansion chamber; the expansion chamber is connected to the air inlet of the gas-liquid separator, a gas outlet is installed on one side of the top of the gas-liquid separator, and a liquid outlet is installed on one side of the lower part of the gas-liquid separator. In the process of gas-liquid separation of the device, the droplets may reduce the separation efficiency due to excessive flow rate or low atomization effect of the nozzle. In addition, the structure of the device also limits the increase in its processing capacity, and is not suitable for processing relatively harsh working environments such as coal yards. Summary of the invention

[0005] In order to solve the defects of the prior art, the present invention proposes a mobile coal yard water film dust removal device, which has the advantages of good dust removal efficiency and high space utilization, can effectively reduce the dust pollution generated during unloading and transporting coal, and ensure the occupational health of workers and the normal operation of equipment.

[0006] The technical problem of the present invention is solved by the following technical solution: A mobile coal yard water film dust removal device, which comprises a mobile trolley and a dust removal device, the dust removal device is installed on the mobile trolley, the dust removal device comprises a dust atomization part and a dust removal purification part; the dust atomization part comprises an air suction port, an atomization chamber, a nozzle, a pressure pump and a water tank, the air suction port is an inverted cone chamber, the air outlet diffusion port is a cone cylinder with a gradually expanding diameter, and a cylindrical atomization chamber is between the two; the atomization chamber is equipped with a nozzle, a first deflector and a second deflector, the nozzle is arranged at the left end of the atomization chamber, and the nozzle is connected to the water tank through a pressure pump. Connected to the water tank, high-pressure water is sprayed out from the nozzle in the form of mist, mixed with the dust-laden airflow, and enters the dust removal and purification part; the dust removal and purification part includes a dust collector, an air inlet, a water film nozzle and a purified air outlet, the dust collector is divided into an upper and lower part, the upper part is a cylindrical body, the lower part is a frustum, a purified air outlet is provided on the top cover, and the bottom of the frustum is immersed in the water seal pool; the air inlet and the water film nozzle enter the dust collector in the direction tangent to the cylinder wall respectively, and the purified air outlet is connected to the hot air dryer, the dust filter and the induced draft fan in sequence through a pipeline.

[0007] In the above-mentioned mobile coal yard water film dust removal device, the first deflector is composed of four deflector plates and a cylindrical body, one side of the deflector plate is fixed to the inner wall, and the other side is connected to the cylindrical body, and the cylindrical body and the inner wall of the atomization chamber are concentric; the deflector plate and the cylindrical body are both thin sheets extending axially.

[0008] In the above-mentioned mobile coal yard water film dust removal device, the second deflector is composed of deflector plates evenly distributed along the inner wall of the atomization chamber, each deflector plate is located at the turning point between the atomization chamber and the air outlet tube, and extends to both sides respectively.

[0009] The above-mentioned mobile coal yard water film dust removal device has multiple water film nozzles, which are evenly distributed on the cylinder wall along a spiral line from the upper end of the cylinder wall to the lower end of the cylinder wall, and the spiral line is a complete spiral.

[0010] The above-mentioned mobile coal yard water film dust removal device, the dust filter is a bag dust collector.

[0011] In the above-mentioned mobile coal yard water film dust removal device, the atomization chamber and the air inlet of the dust collector are connected through an adapter tube.

[0012] The above-mentioned mobile coal yard water film dust removal device is provided with multiple sets to form a dust removal matrix, all of which are installed on a mobile trolley.

[0013] In the above-mentioned mobile coal yard water film dust removal device, the diameter of the cylindrical body is approximately 1 / 2-2 / 3 of the diameter of the atomization chamber.

[0014] In the above-mentioned mobile coal yard water film dust removal device, the windward side and the leeward side of the guide plate and the cylinder are both blade-shaped.

[0015] In the above-mentioned mobile coal yard water film dust removal device, the central axis of the nozzle is located coaxially with the central axis of the atomization chamber. Beneficial Effects

[0016] Compared with the prior art, the present invention has the following advantages: 1. The atomizing chamber of the present invention adopts a frustum shape at both ends connected together. For the air inlet, the absorption area of ​​the dust-containing airflow is expanded, which can prevent the dust-containing air from escaping and is beneficial to the treatment of polluted air; the air outlet diffusion port of the atomizing chamber adopts a frustum shape with a gradually increasing diameter, which can make the dust-containing air have a better atomization and mixing effect, laying a foundation for the dust filtration in the next stage.

[0017] 2. The throat of the present invention adopts a straight tube with a smaller diameter, and is equipped with high-speed spray droplets, so that the airflow can be fully moistened, the weight of the dust is increased, and conditions are created for centrifugal separation.

[0018] 3. The present invention arranges a first flow guide and a second flow guide at the throat to guide all airflows passing through the throat, thereby greatly reducing the pressure loss caused by eddy currents and reducing energy consumption.

[0019] 4. The present invention sprays water film along the cylinder wall of the dust collector. The water film has a large coverage area and good coverage. The water film improves the isolation property of the cylinder wall to dust, prevents dust from adhering to the cylinder wall, and solves the shortcoming that the separation effect of the cylinder wall is greatly reduced after a period of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the dust atomization part; Figure 3 It is a schematic diagram of the structure of the purification part; Figure 4 It is a schematic diagram of the structure of the water film nozzle; Figure 5 It is a schematic diagram of the structure of the first deflector.

[0021] The numbers in the figure are respectively represented as: 1, air suction port, 2, nozzle, 3, first deflector, 4, second deflector, 5, atomization chamber, 6, air inlet, 7, water film nozzle, 8, dust collector, 9, purified air outlet, 10, dust filter, 11, induced draft fan, 12, booster pump, 13, water tank, 14, water seal tank, 15, adapter pipe, 16, deflector, 17, cylinder, 18, hot air dryer, 19, air outlet diffuser. DETAILED DESCRIPTION

[0022] See also Figure 1The present invention includes a mobile trolley and a dust removal device. The dust removal device is installed on the mobile trolley. The dust removal device includes a dust atomization part and a dust removal purification part. The dust atomization part is used to absorb coal dust diffused in the air and mix the coal dust with droplets to increase the weight of dust particles, which is beneficial to the next stage of separation. The dust removal purification part is used to separate smoke and dust particles in the mixed airflow. The dust atomization part is connected to the air inlet 6 of the dust removal purification part through an adapter pipe 15.

[0023] See also Figure 2 The dust atomization part includes an air intake port 1, a nozzle 2, an atomization chamber 5, an air outlet diffuser 19, a pressure pump 12 and a water tank 13. The air intake port 1 is an inverted frustum-shaped chamber, and the air outlet diffuser 19 is a frustum-shaped cylinder with a gradually increasing diameter, and the cylindrical atomization chamber 5 is between the two. The nozzle 2, the first deflector 3 and the second deflector 4 are installed in the atomization chamber 5; the air outlet diffuser 19 is a frustum-shaped chamber, which is connected to the adapter pipe 15 and connected to the air inlet 6. The air intake port 1, the atomization chamber 5 and the air outlet diffuser 19 together form a shape similar to a Venturi tube. The nozzle 2 is set at the left end of the atomization chamber 5 and sprays water mist in the direction of the air outlet diffuser 19. The nozzle 2 is connected to the water tank 13 through a pipeline, and a pressure pump 12 is installed in the pipeline to increase the injection pressure of the nozzle 2, and spray out a mist of water mist to mix with the coal dust particles. The nozzle 2 of the present invention is a nozzle capable of highly atomizing. The better the atomizing effect, the better the wetting effect on the dust particles, and the easier it is to perform centrifugal separation later.

[0024] The present invention is provided with an adapter tube 15, one end of which is connected to the air outlet diffuser 19, and the other end is connected to the air inlet 6 of the dust collector 8. Since the diameter of the dust collector 8 is relatively large, and in order to make the air flow entering the dust collector 8 have a good swirl effect, the lateral dimension of the air inlet 6 cannot be too large (similarly, the height dimension also has a size limit), therefore, in order to make the air outlet diffuser 19 communicate with the air inlet 6 of the dust collector 8, the adapter tube 15 must be used to transition from a cylindrical cylinder to a rectangular cylinder to obtain the least pressure loss.

[0025] See also Figure 3 The dust removal and purification part of the present invention includes a dust collector 8, an air inlet 6, a water film nozzle 7 and a purified air outlet 9. The dust collector 8 is divided into two parts, the upper part is a cylindrical body, and the lower part is a frustum body. The dust collector 8 is an inverted cone with a wide top and a narrow bottom. When the airflow rotates downward in the cylinder wall, the swirl speed becomes larger and larger, and the centrifugal force on the dust particles becomes larger and larger. The dust particles are more likely to be thrown to the wall during the rotation process, and slide down along the conical inner wall of the dust collector 8 to the collection area, so that the dust particles in the airflow have a better separation efficiency.

[0026] A purified air outlet 9 is provided at the top cover of the dust collector 8, and a water seal pool 14 is provided at the bottom of the dust collector 8, so that the airflow forms an external vortex and an internal vortex in the cylinder wall of the dust collector 8. The external vortex separates the dust particles and becomes a clean internal vortex, which is then discharged from the dust collector 8 from the purified air outlet 9.

[0027] The discharged purified air enters the hot air dryer 18, the dust filter 10 and the induced draft fan 11 in sequence. The dust filter 10 adopts a bag filter, which has a good dust filtering effect and can filter the smoke particles in the airflow. The hot air dryer 18 is used to dry the excess moisture in the gas so that it will not block the dust filter 10, and the clean gas is discharged more smoothly.

[0028] See also Figure 5 When the present invention processes coal dust particles, the airflow undergoes compression and expansion in the dust removal device. This process will cause a sharp change in the fluid morphology and lead to pressure loss. In order to reduce this energy loss as much as possible, the present invention designs a special first deflector 3 and a second deflector 4. Among them, the first deflector 3 is composed of a deflector 16 and a cylinder 17. The cylinder 17 is concentric with the inner wall of the atomizing chamber 5. The diameter of the cylinder 17 is about 1 / 2-2 / 3 of the diameter of the atomizing chamber. One end of the deflector 16 is welded to the inner wall of the atomizing chamber 5, and the other end is welded to the cylinder 17. In this way, the cross section of the atomizing chamber is divided into two parts. The central part is a stable airflow with a higher speed, and the viscous part at the edge will be rectified by the deflector to reduce the pressure loss caused by the eddy current and the viscous effect. The deflector 16 and the cylinder 17 are both thin sheets extending in the axial direction, and the windward side and the leeward side are both blade-shaped to reduce the airflow resistance. The cylinder 17 is designed to be cylindrical, so as to separate the airflow in the center from the edge, prevent the airflow interference at the edge, and reduce the pressure loss as much as possible.

[0029] Similarly, the second deflector 4 is a deflector plate evenly spaced along the inner wall of the atomizing chamber 5, each deflector plate is located at the turning point between the atomizing chamber 5 and the air outlet diffuser 19, and extends to both sides respectively. The edge of the deflector plate is blade-shaped to reduce the airflow resistance. The first deflector 3 and the second deflector 4 of the present invention can significantly reduce the airflow disturbance, increase the airflow speed, and make the airflow carry the coal dust particles into the air outlet diffuser 19 at a high speed, where the humid airflow is further diffused, and the wetting effect on the particles is better.

[0030] See also Figure 3 , Figure 4When the coal dust particles of the present invention are separated in the dust collector 8, since the coal dust contains colloidal components, it will adhere to the cylinder wall and affect the separation effect. For this reason, the present invention forms a water film on the cylinder wall, and uses the water film to isolate the contact between the water flow and the cylinder wall. The water film is formed by the water film nozzle 7. The water film nozzle 7 sprays clean water into the dust collector 8, and the water film is distributed along the cylinder wall in a vortex to form a water film. However, as the pressure head decreases, the effect of the water film being evenly distributed will become lower and lower, and eventually flow down the cylinder wall due to gravity. The present invention sets a plurality of water film nozzles 7, which are evenly distributed along the spiral line from the upper end of the cylinder wall to the lower end of the cylinder wall on the cylinder wall of the dust collector 8, and the water film nozzles 7 are evenly distributed according to a complete spiral line. In this way, the water film nozzles 7 will form a relay, and the water film on the cylinder wall is evenly distributed by multiple water film nozzles 7, which solves the problem of water film interruption and affecting the separation effect.

[0031] In addition, considering that the coal yard is a large workplace for loading and unloading coal, a single dust removal device cannot meet the needs. Therefore, the present invention can set up multiple dust removal devices to form a dust removal matrix, and jointly remove dust from the dust-generating points, so that the effect of controlling coal dust pollution will be better. In addition, as the dust-generating points change, the dust removal device of the present invention can be moved at will using a trolley, and a better dust removal effect can be obtained.

[0032] The working process of the present invention is as follows: The coal dust airflow enters from the air inlet 1, and when passing through the atomizing chamber 5, its flow area is reduced and the airflow speed is increased. Clean water is sprayed into the atomizing chamber 5 by the nozzle 2, and water mist is formed under the impact of the high-speed airflow. After being guided by the two-stage guide, the flow rate is greater, and the mixing effect of water mist and coal dust is better; the mixed coal dust airflow enters the dust collector 8 tangentially, and the coal dust particles are thrown to the inner wall of the dust collector 8 cylinder under the action of centrifugal force, and are separated by the water film on the inner wall of the dust collector 8 to form coal slurry water, which flows into the water seal pool 14 along the inner wall of the dust collector 8. After the coal dust airflow particles are centrifugally thrown away, the gas rotates and rises, and is discharged through the purified air outlet 9, and then dried by the hot air dryer 18 to remove the moisture in the airflow, and the fine particles in the airflow are further filtered and removed by the dust filter 10, and then the clean air is discharged into the atmosphere through the external induced draft fan 11, so that the coal dust pollution can be controlled.

Claims

1. A mobile coal yard water film dust removal device, which includes a mobile trolley and a dust removal device, the dust removal device is installed on the mobile trolley, and is characterized by: The dust removal device comprises a dust atomization part and a dust removal and purification part; the dust atomization part comprises an air suction port (1), an atomization chamber (5), a nozzle (2), a pressure pump (12) and a water tank (13); the air suction port (1) is an inverted conical chamber; the air outlet diffuser (19) is a cone with a gradually increasing diameter; a cylindrical atomization chamber (5) is located between the two; the nozzle (2), a first deflector (3) and a second deflector (4) are installed in the atomization chamber (5); the nozzle (2) is arranged at the left end of the atomization chamber (5); the nozzle (2) is connected to the water tank (13) via a pressure pump (12); high-pressure water is sprayed out from the nozzle (2) in the form of mist; The dust is mixed with the dust-laden airflow and enters a dust removal and purification section; the dust removal and purification section comprises a dust collector (8), an air inlet (6), a water film nozzle (7) and a purified air outlet (9); the dust collector (8) is divided into an upper and lower part, the upper part is a cylindrical body, and the lower part is a frustum-shaped body, which is a wide upper part and narrow lower part. The purified air outlet (9) is provided at the top cover, and a water seal pool (14) is provided at the bottom of the frustum; the air inlet (6) and the water film nozzle (7) respectively enter the dust collector (8) in a direction tangent to the cylinder wall, and the purified air outlet (9) is connected to a hot air dryer (18), a dust filter (10) and an induced draft fan (11) in sequence through a pipeline.

2. The mobile coal yard water film dust removal device according to claim 1 is characterized by: The first flow guide (3) is composed of a flow guide plate (16) and a cylindrical body (17); one side of the flow guide plate (16) is fixedly connected to the inner wall, and the other side is connected to the cylindrical body (17); the cylindrical body (17) and the inner wall of the atomization chamber (5) are concentric; the flow guide plate (16) and the cylindrical body (17) are both in the form of thin sheets extending in the axial direction.

3. The mobile coal yard water film dust removal device according to claim 1 is characterized in that: The second flow guide (4) is composed of flow guide plates evenly distributed along the inner wall of the atomization chamber (5), each flow guide plate being located at the turning point between the atomization chamber (5) and the air outlet diffuser (19), and extending to both sides respectively.

4. The mobile coal yard water film dust removal device according to claim 1 is characterized in that: The water film nozzles (7) are provided in plurality and are evenly distributed on the cylinder wall along a spiral line from the upper end of the cylinder wall to the lower end of the cylinder wall, and the spiral line is a spiral.

5. The mobile coal yard water film dust removal device according to claim 1 is characterized by: The dust filter (10) is a bag dust collector.

6. The mobile coal yard water film dust removal device according to claim 1 is characterized by: The atomization chamber (5) is connected to the air inlet (6) of the dust collector (8) via an adapter tube (15).

7. The mobile coal yard water film dust removal device according to claim 1 is characterized by: The dust removal device is provided with multiple sets to form a dust removal matrix, and all of them are installed on a mobile trolley.

8. The mobile coal yard water film dust removal device according to claim 2 is characterized by: The diameter of the cylindrical body (17) is approximately 1 / 2 to 2 / 3 of the diameter of the atomization chamber (5).

9. The mobile coal yard water film dust removal device according to claim 2 is characterized by: The windward surface and the leeward surface of the guide plate (16) and the cylindrical body (17) are both blade-shaped.

10. The mobile coal yard water film dust removal device according to claim 1 is characterized by: The central axis of the nozzle (2) is located coaxially with the central axis of the atomization chamber (5).

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