Dust treatment equipment of coal conveying system

Abstract

The invention discloses dust treatment equipment of a coal conveying system, and belongs to the technical field of dust treatment, the dust treatment equipment comprises a gas collection pipeline, and a water bath dust removal chamber, a sedimentation dust removal chamber, a sinter plate dust removal chamber and a gas purification chamber which are sequentially arranged from bottom to top, the outlet of the gas purification chamber is connected with the input end of a smoke exhaust pipeline, and an induced draft fan is arranged in the smoke exhaust pipeline; the output tail end of the gas collection pipeline is connected with a flow equalizing plate in the water bath dust removal chamber, a bottom turbulent flow layer, a streaming layer and a top turbulent flow layer are arranged in the sedimentation dust removal chamber, the streaming layer is formed by Y-shaped streaming elements in a matrix distribution mode, one end of a turbulent flow pipe is open, and the other end of the turbulent flow pipe is connected with an induced draft fan; the sinter plate dust removal chamber is used for further treating the gas treated by the water bath dust removal chamber and the sedimentation dust removal chamber; the flow layer enhances the agglomeration of coal dust gas and water turbulence and the phase change agglomeration of water vapor, and ensures that the airflow is uniformly distributed in the dust removal equipment, so that the dust filtering strength borne by each sinter plate is roughly the same, the dust removal efficiency of the sinter plate is improved, and the service life of the sinter plate is prolonged.

Description

Technical Field

[0001] The invention relates to dust processing equipment for a coal conveying system, belonging to the technical field of dust processing. Background Art

[0002] There are two types of dust removal equipment that are widely used in coal transportation systems. One is the bag dust collector and the other is the wet dust collector. At present, due to coal costs and operating pressure, thermal power generation companies generally choose to blend inferior coal, and the blended coal is mostly Indonesian coal. Indonesian coal has a high moisture content, a large volatile matter, a small dust particle size, and is not easy to settle. The two traditional dust removal equipment have major defects when facing Indonesian coal dust. When the bag dust collector encounters a large amount of moisture and dust, it is very easy to get stuck, resulting in dust removal failure and greatly increasing maintenance costs; coal dust with small particle size has a small volume, a large surface area, and a relatively weak adhesion ability, and the wet dust collector has a poor dust removal effect on it. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention provides a dust treatment device for a coal conveying system to solve the problem that the dust removal effect of the coal conveying system in the prior art is poor.

[0004] The objective of the present invention is achieved through the following technical scheme: a dust treatment device for a coal transportation system, comprising an air collecting pipeline, a water bath dust removal chamber, a sedimentation dust removal chamber, a plastic burning plate dust removal chamber, a clean air chamber, a smoke exhaust pipeline, and an induced draft fan. The water bath dust removal chamber, the sedimentation dust removal chamber, the plastic burning plate dust removal chamber, and the clean air chamber are arranged in sequence from bottom to top, the outlet of the clean air chamber is connected to the input end of the smoke exhaust pipeline, and an induced draft fan is arranged inside the smoke exhaust pipeline; the air collecting pipeline is used to collect the coal dust gas to be treated, and the output end of the air collecting pipeline is connected to the water bath dust removal chamber, the sedimentation dust removal chamber, the plastic burning plate dust removal chamber, and the clean air chamber The input end of the water bath dust removal chamber is connected, a flow equalizing plate is arranged in the water bath dust removal chamber, the output end of the air collecting pipe is connected to the flow equalizing plate, a spoiler layer and a flow circumference layer are arranged in the sedimentation dust removal chamber, the spoiler layer includes a bottom spoiler layer and a top spoiler layer, the flow circumference layer is arranged between the bottom spoiler layer and the top spoiler layer, the flow circumference layer is composed of "Y"-shaped flow circumferencers in a matrix distribution manner, one end of the spoiler layer is an opening, and the other end of the spoiler layer is connected to an induced draft fan, which provides a power source for the air to be introduced into the spoiler layer. The sintered board dust removal chamber further processes the gas processed by the water bath dust removal chamber and the sedimentation dust removal chamber, and the clean gas chamber is used to discharge the clean gas.

[0005] Furthermore, a swirl plate is provided at the output end of the gas collecting pipe, and the swirl plate is located below the flow equalizing plate.

[0006] Furthermore, the gas collecting pipeline is divided into two routes, each of which is provided with two outlets, and the swirl plates of the two outlets of the same route rotate in opposite directions. The swirl plate can increase the gas-liquid contact area. The swirl plate allows the flue gas to have a certain rotational momentum after entering the water bath dust removal chamber, thereby increasing the disturbance. After the airflow rotates and enters below the liquid level, the gas-liquid mixed liquid level increases, which is beneficial to the capture of particulate matter in the dust-laden airflow. After the airflow rotates and disperses radially, the airflow velocity decreases and the coverage area increases, which is beneficial to the uniformity of the flow field in the water bath dust removal chamber and can improve the dust removal efficiency of the plastic sintering plate on particulate matter. In addition, the swirl plate of the same route allows the flue gas to rotate in a combination of clockwise and counterclockwise directions, thereby playing a role in turbulent agglomeration and increasing the turbulence of the gas when it moves upward. The process is accompanied by rotational motion. The rotation directions of adjacent air flows are inconsistent, which play a role of derotation on each other, promoting the vertical rise of the overall airflow. The inconsistent rotation directions of adjacent air flows increase the relative flow velocity in the airflow contact area, and promote the mutual collision between particles in the airflow and droplets entrained in the liquid. The mutual collision between particles (dust + dust, dust + droplets, droplets + droplets) in a high humidity environment will lead to collision and agglomeration, making the particle size larger and the inertial force stronger. When the overall airflow velocity decreases, it is easier to fall through gravity sedimentation, thereby improving the dust removal efficiency and reducing the carryover of droplets.

[0007] Furthermore, the flow balancing plate is a grid plate.

[0008] Furthermore, the bottom spoiler layer or the top spoiler layer is arranged in sequence using a plurality of spoiler tubes, wherein the spoiler tubes are hollow metal tubes, one end of the spoiler tubes is open, and the other end of the spoiler tubes is connected to a main tube, and the main tube is connected to an induced draft fan.

[0009] Furthermore, the spacing between the spoiler tubes is 20 mm, and the diameter of the spoiler tube is 20 mm.

[0010] Furthermore, the arrangement direction of the spoiler tubes of the bottom spoiler layer is perpendicular to the arrangement direction of the spoiler tubes of the top spoiler layer.

[0011] Furthermore, the bottom spacing of the "Y"-shaped windings in the transverse direction of the winding layer is 100 mm, the top spacing thereof is 40 mm, and the spacing between the "Y"-shaped windings in the longitudinal direction of the winding layer is 50 mm.

[0012] Furthermore, the specifications of the "Y"-shaped flow rotor are: height 150mm, width 60mm, thickness 100mm, and top opening angle 60°. A sedimentation dust removal chamber is arranged between the water bath dust removal chamber and the plastic sintering plate dust removal chamber. The spoiler pipe adopts a hollow metal tube, and air can be passed into the interior. The power adopts the tail induced draft fan. Two layers of spoiler layers are arranged, and a flow layer is arranged in between. The arrangement of the bottom spoiler layer plays a role of de-racembrane and homogenization process to a certain extent, which is beneficial to the uniformity of flue gas flow. The addition of flow layers between spoiler layers is beneficial to the turbulence of local airflow, especially the mixing zone at the tail of the "Y"-shaped flow rotor, which has a large turbulence, further promoting the collision and aggregation between particles (dust + dust, dust + droplets, droplets + droplets), increasing the particle size and inertia of the particles, and promoting the gravity sedimentation of the particles. The setting of the top spoiler layer further homogenizes the airflow field and makes the airflow rise evenly, which is beneficial to the dust removal of the dust-containing airflow by the plastic sintering plate. Air is passed into the spoiler tubes and extracted by the tail induced draft fan, which can cool the dust-containing airflow. Since the humidity of the dust-containing airflow increases after water washing, its relative humidity can be further increased after cooling, which can reach an oversaturated state. The particles in the near-wall area of ​​the spoiler tube can grow through condensation of water vapor and then deposit on the spoiler tube. When the airflow containing particles (dust, liquid droplets) collides and grows under the action of the flow carrier and falls, it will pass through the bottom spoiler tube, which can flush the particles on the wall of the spoiler tube and play a self-cleaning role.

[0013] The present invention has the following beneficial effects: the present invention designs gas flow equalization and turbulence equipment, which mainly includes a swirl plate, a flow equalization plate in a water bath dust removal chamber, a turbulence layer and a flow vortex layer in a sedimentation dust removal chamber. This improvement helps to greatly improve the flow of dust gas in the equipment, enhance the mixing intensity of dust and water, improve the dust removal effect, and at the same time avoid the occurrence of uneven output between the plastic sintering plates.

[0014] The present invention provides a dust treatment device for a coal conveying system, which enhances the turbulent agglomeration of coal dust gas and water and the phase change agglomeration of water vapor, while ensuring that the airflow is evenly distributed in the dust removal equipment, so that the dust filtration intensity borne by each plastic-fired plate is roughly the same, thereby improving the dust removal efficiency and service life of the plastic-fired plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the dust treatment equipment of the coal transportation system of the present invention; Figure 2 It is a cross-sectional view of the dust handling equipment of the coal conveying system; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 It is a schematic diagram of the structure of the bottom spoiler layer; Figure 5 It is a schematic diagram of the structure of the flow layer; Figure 6 It is a schematic diagram of the structure of the "Y" type current carrier; Figure 7 It is a schematic diagram of the structure of the top spoiler layer; Figure 8 It is a schematic diagram of the airflow direction of the dust handling equipment of the coal transportation system of the present invention.

[0016] In the figure: 1. Gas collecting duct; 2. Outlet; 3. Water bath dust removal chamber; 4. Flow equalizing plate; 5. Swirl plate; 6. Settling dust removal chamber; 7. Bottom spoiler layer; 8. Spoiler pipe; 9. Top spoiler layer; 10. Flow bypass layer; 11. "Y" type flow bypass; 12. Plastic sintered board dust removal chamber; 13. Clean air chamber; 14. Smoke exhaust duct; 15. Main pipe. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and the accompanying descriptions.

[0018] like Figure 1-8 As shown, a dust treatment device for a coal transportation system includes a gas collecting pipeline 1, a water bath dust removal chamber 3, a sedimentation dust removal chamber 6, a plastic sintering plate dust removal chamber 12, a clean air chamber 13, a smoke exhaust pipeline 14, and an induced draft fan. The water bath dust removal chamber 3, the sedimentation dust removal chamber 6, the plastic sintering plate dust removal chamber 12, and the clean air chamber 13 are arranged in sequence from bottom to top, and the outlet of the clean air chamber 13 is connected to the input end of the smoke exhaust pipeline 14. An induced draft fan is arranged in the middle of the smoke exhaust pipeline 14 to provide power for the flow of coal dust gas, the flow of air in the turbulent pipe, and the discharge of clean gas; The gas collecting pipeline 1 is used to collect the coal dust gas to be treated. The output end of the gas collecting pipeline 1 is connected to the input end of the water bath dust removal chamber 3. The gas collecting pipeline is divided into two paths, each of which is provided with two outlets 2. The coal dust gas enters the water bath dust removal chamber 3 through the outlet 2. Each outlet 2 is provided with a swirl plate 5. The power for the coal dust gas to pass through the swirl plate 5 comes from the induced draft fan in the middle section of the smoke exhaust pipeline 14, and the swirl plate 5 is located below the flow equalizing plate 4 in the water bath dust removal chamber 3. The swirl plates 5 of the two outlets 2 of the same path rotate in opposite directions. In this embodiment, the flow equalizing plate 4 is a grid plate. The sedimentation dust removal chamber 6 is provided with a spoiler layer and a flow-around layer 10, the spoiler layer includes a bottom spoiler layer 7 and a top spoiler layer 9, the flow-around layer 10 is arranged between the bottom spoiler layer 7 and the top spoiler layer 9, the bottom spoiler layer 7 or the top spoiler layer 9 adopts a plurality of spoiler tubes 8 arranged in sequence, the spoiler tube 8 is a hollow metal tube, air can be passed into the interior, the power comes from the induced draft fan in the middle of the smoke exhaust duct 14, one end of the spoiler tube 8 is open, and the other end is connected to the mother tube 15, the mother tube 15 is connected to the induced draft fan, the bottom spoiler layer 7 adopts a spoiler tube 8 with a diameter of 20 mm arranged horizontally, and the spacing between the spoiler tubes 8 is 20 mm. The spacing is 20mm, and the top spoiler layer 9 adopts spoiler tubes 8 with a diameter of 20mm arranged longitudinally. The spacing between the spoiler tubes 8 is 20mm. With the help of the negative pressure formed, the atmosphere is collected to the main tube 15 through the spoiler tubes 8 and further enters the inlet of the induced draft fan. The atmosphere is used to cool the airflow inside the sedimentation dust removal chamber 6, that is, in a high humidity environment, the humidity of the airflow is increased to supersaturation by cooling, and the condensation and growth of particles after the action of water vapor are promoted through the heterogeneous condensation phase change of water vapor, and then they fall to the dust collection area through gravity sedimentation; the vortex layer 10 is composed of "Y"-shaped vortex elements 11 in a matrix distribution. The bottom spacing of the "Y"-shaped flow rotors 11 in the transverse direction of the flow layer 10 is 100 mm, and the top spacing is 40 mm. The spacing between the "Y"-shaped flow rotors 11 in the longitudinal direction of the flow layer 10 is 50 mm. The specifications of the "Y"-shaped flow rotors 11 are: height 150 mm, width 60 mm, thickness 100 mm, and top opening angle 60°. The flow layer 10 is used to increase the local turbulence of the flue gas. Under higher turbulence, it strengthens the collision and aggregation between particles / droplets in the gas, promotes the interaction of small particles to form large particles, and then leaves the gas phase through gravity sedimentation and falls into the bottom dust collection area; In another embodiment, the clean air chamber 13 is used to discharge clean gas. The clean air chamber 13 can be divided into multiple small clean air chambers and switched on and off by a lifting valve. The lifting valve is closed each time soot is blown to ensure that all compressed air can enter the plastic sintering plate.

[0019] In another embodiment, the plastic-fired board dust removal chamber 12 is equipped with a pulse soot blowing system, which includes a compressed air pipeline, a pulse solenoid valve, and a blowpipe nozzle. The pulse soot blowing system is arranged above the plastic-fired board dust removal chamber 12. The compressed air is controlled by the pulse solenoid valve and is sprayed into the plastic-fired board filter element cavity at a regular interval to remove the dust attached to the surface of the plastic-fired board filter element, thereby ensuring the dust removal effect and preventing dust removal failure.

[0020] Working principle: The coal dust gas to be treated, under the action of the fan, first passes through the gas collecting pipe 1 and enters the water bath dust removal chamber 3. A swirl plate 5 is arranged at the output end outlet of the gas collecting pipe 1. The swirl plate 5 can make the coal dust gas have a certain rotation momentum after entering the dust collector, increase the disturbance, and after the airflow rotates, it enters the water bath dust removal chamber 3 below the water surface, the gas-liquid mixing area increases, so that the particles in the dust-containing airflow are captured; after the airflow rotates and disperses radially, the airflow speed decreases and the coverage area increases, so that the flow field in the dust collector is uniform. In addition, the swirl plate 5 adopts a combination of clockwise and counterclockwise to increase the turbulence of the gas when it moves upward, which plays a role Turbulent agglomeration: The rising process of airflow is accompanied by rotation. The rotation directions of adjacent airflows are inconsistent, which play a role of de-rotation and promote the vertical rise of the overall airflow. The inconsistent rotation directions of adjacent airflows increase the relative flow velocity in the airflow contact area, which promotes the mutual collision between particles in the airflow and droplets sucked in the liquid. The mutual collision between particles (dust + dust, dust + droplets, droplets + droplets) in a high-humidity environment will lead to collision and agglomeration, making the particle size larger and the inertial force stronger. When the overall airflow speed decreases, it falls by gravity sedimentation, thereby improving the dust removal efficiency and reducing the carryover of droplets. After removing large-particle dust in the water bath dust removal chamber 3, the coal dust gas continues to move upward through the flow equalizing plate 4 and enters the sedimentation dust removal chamber 6. The arrangement of the bottom spoiler layer 7 plays a role in de-rotation and homogenizing the flow field, making the flue gas flow uniform; the addition of the flow layer 10 between the spoiler layers increases the turbulence of the local airflow. The mixing zone at the tail of the "Y"-shaped flow element 11 has a larger turbulence, which further promotes the collision and aggregation of particles (dust + dust, dust + droplets, droplets + droplets), increases the particle size and inertia of the particles, and promotes the gravity sedimentation of the particles; the setting of the top spoiler layer 9 homogenizes the airflow field, makes the airflow rise evenly, and is convenient for the plastic sintering plate to remove the dust-containing airflow; air is introduced between the spoiler layers and extracted by the tail induced draft fan, which has a cooling effect on the dust-containing airflow. Since the humidity of the dust-laden airflow increases after being washed with water, its relative humidity can be further increased after cooling, and can reach a supersaturated state. The particles near the wall of the spoiler tube 8 can grow through condensation of water vapor and then deposit on the spoiler tube. When the airflow containing particles (dust, droplets) collides and grows under the action of the "Y"-shaped flow generator 11 and falls, it will pass through the bottom spoiler layer 7, which can flush the particles deposited on the wall of the spoiler tube 8 and play a self-cleaning role; The coal dust gas that has passed through the sedimentation dust removal chamber 6 continues to move upward under the action of the induced draft fan and eventually enters the plastic-sintered board dust removal chamber 12, where it is finely dusted by the plastic-sintered board filter material and the clean gas enters the top clean air chamber and is discharged; during the operation of the equipment, the compressed air enters the pulse valve through the air storage tank, and then the blowpipe and nozzle blow the plastic-sintered board to remove the dust on the surface of the plastic-sintered board.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made to the above embodiment based on the technical essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A dust treatment device for a coal transportation system, characterized in that: It comprises an air collecting duct (1), a water bath dust removal chamber (3), a settling dust removal chamber (6), a plastic sintering plate dust removal chamber (12), a clean air chamber (13), a smoke exhaust duct (14), and an induced draft fan, wherein the water bath dust removal chamber (3), the settling dust removal chamber (6), the plastic sintering plate dust removal chamber (12), and the clean air chamber (13) are arranged in sequence from bottom to top, the outlet of the clean air chamber (13) is connected to the input end of the smoke exhaust duct (14), and the smoke exhaust duct (14) is provided with an induced draft fan inside; The gas collecting pipeline (1) is used to collect the coal dust gas to be treated. The output end of the gas collecting pipeline (1) is connected to the input end of the water bath dust removal chamber (3). The water bath dust removal chamber (3) is provided with a flow balancing plate (4). The output end of the gas collecting pipeline (1) is connected to the flow balancing plate (4). The settling dust removal chamber (6) is provided with a spoiler layer and a flow circumference layer (10). The spoiler layer includes a bottom spoiler layer (7) and a top spoiler layer (9). The flow circumference layer (10) is arranged at the bottom. Between the lower spoiler layer (7) and the top spoiler layer (9), the flow-bearing layer (10) is composed of "Y"-shaped flow-bearing elements (11) distributed in a matrix manner, one end of the spoiler layer is an opening, and the other end of the spoiler layer is connected to an induced draft fan, which provides a power source for the air to be introduced into the spoiler layer. The sintered plate dust removal chamber (13) further processes the gas treated by the water bath dust removal chamber (3) and the sedimentation dust removal chamber (6), and the clean air chamber (13) is used to discharge clean gas.

2. The dust treatment equipment for the coal transportation system according to claim 1, characterized in that: A swirl plate (5) is provided at the output end of the gas collecting pipeline (1), and the swirl plate (5) is located below the flow balancing plate (4).

3. The dust treatment equipment for the coal transportation system according to claim 2, characterized in that: The gas collecting pipeline (1) is divided into two paths, each path is provided with two outlets (2), and the swirl plates (5) of the two outlets (2) of the same path rotate in opposite directions.

4. The dust treatment equipment for the coal transportation system according to claim 1, characterized in that: The flow balancing plate (4) is a grid plate.

5. The dust treatment equipment for the coal transportation system according to claim 1, characterized in that: The bottom spoiler layer (7) or the top spoiler layer (9) is formed by a plurality of spoiler tubes (8) arranged in sequence, wherein the spoiler tubes (8) are hollow metal tubes, one end of the spoiler tubes (8) is open, and the other end of the spoiler tubes (8) is connected to a main tube (15), and the main tube (15) is connected to an induced draft fan.

6. The dust treatment equipment for the coal transportation system according to claim 5, characterized in that: The spacing between the spoiler tubes (8) is 20 mm, and the diameter of the spoiler tubes (8) is 20 mm.

7. The dust treatment equipment for the coal transportation system according to claim 5, characterized in that: The arrangement direction of the spoiler tubes (8) of the bottom spoiler layer (7) is perpendicular to the arrangement direction of the spoiler tubes of the top spoiler layer (9).

8. The dust treatment equipment for the coal transportation system according to claim 1, characterized in that: The bottom spacing of the "Y"-shaped windings (11) in the transverse direction of the winding layer (10) is 100 mm, the top spacing thereof is 40 mm, and the spacing between the "Y"-shaped windings (11) in the longitudinal direction of the winding layer (10) is 50 mm.

9. The dust treatment equipment for the coal transportation system according to claim 1, characterized in that: The specifications of the "Y"-shaped winding (11) are: height 150 mm, width 60 mm, thickness 100 mm, and top opening angle 60°.

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