CN118698269A - An environmentally friendly dust removal and exhaust method - Google Patents

Abstract

The present application relates to the technical field of waste gas purification and treatment, and in particular to an environmentally friendly dust removal and exhaust method, comprising: S1: allowing the waste gas from aluminum rod casting to enter the air transmission pipeline through the air intake assembly; S2: allowing the waste gas to enter the settling piece through the air transmission pipeline for preliminary settling, and then enter the separation chamber of the separation filter box after preliminary settling; S3: after the waste gas enters the separation chamber, it undergoes secondary settling, and then enters the filter chamber for filtration; S4: filtering the gas entering the filter chamber through the air filter assembly, and the gas enters the isolation chamber after filtration, and then the gas in the isolation chamber is transferred to the exhaust chimney for discharge. The present application has the effect of reducing the pollution of aluminum casting exhaust.

Description

An environmentally friendly dust removal and exhaust method

Technical Field

The present application relates to the technical field of waste gas purification and treatment, and in particular to an environmentally friendly dust removal and exhaust method.

Background Art

At present, the smelting and casting of aluminum rods includes melting, purification, impurity removal, degassing, slag removal and casting processes. During the process, high-temperature melting and casting equipment is needed to melt the aluminum material, separate the aluminum from other impurities, and then extract the aluminum liquid for further processing and purification.

In the process of melting aluminum, a large amount of waste gas containing metal debris and dust is usually generated. If it is discharged directly, it will cause serious pollution to the environment. In the existing dust removal method, the waste gas is only introduced into the dust collector for a filtering process and then discharged directly. It cannot ensure that the waste gas is sufficiently purified before filtering, which is easy to cause greater pollution to the environment. The metal debris and dust in the waste gas may scratch or corrode the filter bag, thereby damaging the dust filter bag, causing the waste gas to be discharged before sufficient filtration is completed, thereby polluting the environment.

Summary of the invention

In order to reduce exhaust pollution from aluminum smelting and casting, the present application provides an environmentally friendly dust removal and exhaust method.

The present application provides an environmentally friendly dust removal and exhaust method, which adopts the following technical solutions:

An environmentally friendly dust removal and exhaust method comprises the following steps: S1: allowing aluminum rod casting waste gas to enter an air transmission pipeline through an air intake assembly; S2: allowing the waste gas to enter a sedimentation piece through the air transmission pipeline for preliminary sedimentation, and then enter a separation chamber of a separation filter box after preliminary sedimentation; S3: after the waste gas enters the separation chamber, it undergoes secondary sedimentation, and then enters a filter chamber for filtration; S4: filtering the waste gas entering the filter chamber through an air filter assembly, and the gas enters an isolation chamber after filtration, and then the gas in the isolation chamber is transferred to an exhaust chimney for discharge.

By adopting the above technical scheme, the coarse particles and debris and a part of the dust in the exhaust gas are separated from the exhaust gas through preliminary sedimentation, and then enter the separation chamber for secondary sedimentation to separate the coarse particles and the remaining debris in the exhaust gas from the exhaust gas again, and the remaining fine particles follow the exhaust gas into the filter chamber for further filtration, so that the exhaust gas and the debris dust are fully separated, and the scratches or corrosion of the filter components by the debris and dust are reduced, and most of the dust in the exhaust gas can be retained in the sedimentation parts, the separation chamber and the filter chamber, thereby reducing the pollution of the gas discharged after filtration to the environment.

Optionally, in step S2, after the exhaust gas enters the settling member from the gas transmission pipe, the exhaust gas is initially settled by affecting the flow rate of the exhaust gas.

By adopting the above technical solution, the debris and dust are allowed to settle under the action of gravity, which affects the flow rate of the exhaust gas and slows it down, so that the debris and dust can be separated and settled more fully.

Optionally, the sedimentation member includes a sedimentation pipe, which is connected to the air transfer pipe. The side wall of the sedimentation pipe is provided with an air inlet connected to the separation chamber. The exhaust gas in the sedimentation pipe can enter the separation chamber through the air inlet. The bottom of the sedimentation pipe is inclined.

By adopting the above technical solution, the settled coarse particle debris can slide into the separation chamber through the ventilation opening and the inclined surface, thereby facilitating collection.

Optionally, the inner diameter of the settling pipe gradually decreases in a direction away from the air transfer pipe, and the air inlets are arranged in a direction away from the air transfer pipe.

By adopting the above technical solution, the resistance of the exhaust gas after entering the settling pipe can be increased, and the flow rate of the exhaust gas can be further slowed down.

Optionally, in step S3, after the exhaust gas enters the separation chamber, the coarse dust particles that are secondary settled fall to the bottom of the separation chamber and are collected by a collection assembly disposed at the bottom of the separation filter box.

By adopting the above technical solution, dust and debris can be collected using a collection component to facilitate recycling and centralized treatment.

Optionally, the collecting assembly includes a collecting and transferring box located below the separation chamber, and a dust collecting bag is provided at the discharge end of the collecting and transferring box. During steps S2-S4, when the dust collecting bag is full of dust, the dust collecting bag is replaced by a replacement assembly arranged on the collecting and transferring box.

By adopting the above technical solution, when the dust collecting bag is fully loaded, it can be replaced by replacing the assembly, and then other dust collecting bags can be replaced to collect dust, thereby realizing uninterrupted dust collection.

Optionally, the replacement assembly includes a fixed frame and a transverse seat, the fixed frame is connected to the collection and transfer box, the transverse seat is slidably connected to the fixed frame, the transverse seat is detachably provided with a disassembly frame, the number of the disassembly frames is not less than two, and the dust collection bag is connected to the disassembly frame.

By adopting the above technical solution, one ash bag is used for collection while the other ash bag is kept as a standby. When replacing, the sliding transverse seat can replace the original ash bag for collection, and the fully loaded ash bag can be removed and replaced to achieve uninterrupted ash collection.

Optionally, in step S4, the gas enters the air outlet pipe after being filtered by the air filter assembly, and the exhaust drive element draws the gas in the air outlet pipe into the exhaust chimney.

By adopting the above technical solution, the gas can be discharged into the exhaust chimney to increase the discharge height and reduce the impact on the surrounding ground environment. After being discharged to a higher altitude, the turbulence and diffusion of the atmosphere can dilute the discharged gas more quickly.

Optionally, step S5 is added after step S4: starting the dust removal drive component to intermittently spray air to the air filter assembly in the dust removal chamber.

By adopting the above technical solution, the fine dust particles attached to the air filter component can be blown off by jetting air to the air filter component, thereby helping the air filter component to maintain the expected filterable gas volume.

Optionally, the air filter assembly includes a dust filter bag, a partition is provided in the separation filter box, the partition is provided with an air vent, the dust filter bag is installed at the air vent, and the air filter assembly also includes an outer cage frame, the outer cage frame is connected to the partition, and the outer cage frame cover is provided on the surrounding side of the dust filter bag.

By adopting the above technical solution, when the dust filter bag is jetted for dust removal, the outer cage frame can provide external support and limit the dust filter bag, thereby improving the stability of the dust filter bag and reducing the excessive expansion of the dust filter bag when using strong wind force.

In summary, the present application includes at least one of the following beneficial technical effects:

1. Through the initial sedimentation, the coarse particles and debris in the exhaust gas and a part of the dust are separated from the exhaust gas first, and then enter the separation chamber for secondary sedimentation to separate the coarse particles and the remaining debris in the exhaust gas from the exhaust gas again. The remaining fine particles follow the exhaust gas into the filter chamber for further filtration, so that the exhaust gas and the debris dust are fully separated. In this state, most of the dust in the exhaust gas can be left in the sedimentation piece, the separation chamber and the filter chamber, thereby reducing the pollution of the gas discharged after filtration to the environment;

2. Make the debris and dust settle under the action of gravity, affect the flow rate of the exhaust gas and slow down the flow rate of the exhaust gas, so that the debris and dust can be separated and settled more fully;

3. When one ash bag is used for collection, the other ash bag is kept as a standby. When replacing, the sliding transverse seat can replace the original ash bag for collection, and the fully loaded ash bag can be removed and replaced to achieve uninterrupted ash collection.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the external structure of a dust removal and exhaust device in an embodiment of the present application.

FIG. 2 is a schematic diagram of the dust removal and exhaust device in the embodiment of the present application from another perspective.

FIG. 3 is a schematic diagram of the internal structure of the dust removal and exhaust device in an embodiment of the present application.

FIG. 4 is a schematic diagram of the internal structure of a settling tube in an embodiment of the present application.

FIG. 5 is a diagram showing the internal structure of the dust removal and exhaust device from another perspective in an embodiment of the present application.

FIG6 is a partial cross-sectional view of the fixed frame, the transverse seat and the disassembly frame in the embodiment of the present application.

FIG. 7 is a schematic diagram of the connection between the driving rod and the extension rod in an embodiment of the present application.

FIG8 is a cross-sectional view of the structure of the inner cage frame, the dust filter bag and the outer cage frame in the embodiment of the present application.

Description of reference numerals:

1. Intake assembly; 11. Air transmission duct; 2. Settling pipe; 21. Air inlet; 3. Separation filter box; 31. Separation chamber; 32. Filter chamber; 33. Isolation chamber; 34. Partition; 341. Dust filter bag; 342. Outer cage; 343. Inner cage; 35. Air outlet pipe; 351. Exhaust drive; 36. Rotating ring; 361. Extension rod; 37. Rotating drive; 38. Drive rod; 39. Dust removal drive; 4. Exhaust chimney; 5. Collection transfer box; 51. Material receiving hole; 52, material discharging motor; 53, rotating rod; 54, propeller belt; 55, dust collecting bag; 551, connecting ring; 56, fixed seat; 561, plug hole; 57, empty hole; 571, sweeping frame; 572, sweeping hair; 6, fixed frame; 61, transverse seat; 611, stepped through groove; 62, transverse driving part; 63, disassembly and assembly frame; 631, plug block; 632, plug ring; 64, lifting and landing driving part; 65, lifting and landing seat; 651, annular groove; 652, pressure sensor.

DETAILED DESCRIPTION

The present application is further described in detail below in conjunction with Figures 1-8.

The embodiment of the present application discloses an environmentally friendly dust removal and exhaust method.

1 and 2, an environmentally friendly dust removal and exhaust method includes the following steps:

S1: A dust removal exhaust device is used, and the dust removal exhaust device is placed close to the aluminum rod smelting and casting equipment. Referring to Figures 1 and 3, the dust removal and exhaust device includes an air intake component 1, an air transmission pipeline 11, a settling piece, a separation filter box 3, an air filter component and an exhaust chimney 4. The separation filter box 3 is installed on the ground through a bracket. A separation chamber 31, a filter chamber 32 and an isolation chamber 33 are provided inside the separation filter box 3. The air intake component 1 is located above the exhaust port of the aluminum rod smelting and casting equipment, and the aluminum rod smelting and casting waste gas enters the air transmission pipeline 11 through the air intake component 1. The exhaust chimney 4 is arranged on the outside of the separation filter box 3;

S2: The exhaust gas enters the settling piece through the gas transmission pipe 11, and the exhaust gas is initially settled in the settling piece, so that some large particles are separated from the gas phase, and the separated large particles fall to the bottom of the settling piece. After the initial settling, the exhaust gas enters the separation chamber 31;

S3: After the exhaust gas enters the separation chamber 31, it undergoes secondary sedimentation. The coarse dust particles in the separation chamber 31 are separated from the gas. The separated coarse dust particles fall to the bottom of the separation chamber 31. After the secondary separation, the exhaust gas enters the filter chamber 32 for filtration.

S4: The waste gas after the secondary separation enters the gas filter assembly, and the waste gas entering the filter chamber 32 is filtered by the gas filter assembly. After the gas is filtered, it enters the isolation chamber 33, and then the gas in the isolation chamber 33 is transferred to the exhaust chimney 4 for discharge.

Through two sedimentation steps, metal particles and coarse particles such as dust in the exhaust gas are separated from the exhaust gas in turn, and then the fine particles and dust remaining in the exhaust gas are separated from the gas through the air filter component, thereby completing the gas filtering and purification. The air after filtration is separated from the air before filtration through the isolation chamber 33 and the filter cavity 32, and the filtered gas is discharged to reduce the metal particles and dust carried in the exhaust gas. During the sedimentation and filtration process, the exhaust gas and debris dust are fully separated, reducing the scratches or corrosion of the filter component by debris and dust, and reducing the pollution of the gas discharged after filtration to the environment, thereby achieving the effect of environmentally friendly exhaust.

Referring to Figures 2 and 4, one end of the air transfer pipe 11 is connected to the settlement piece, and the air intake assembly 1 is composed of an air intake drive and an air intake hood. The air intake hood is installed at one end of the air transfer pipe 11 away from the settlement piece. The air intake drive is an exhaust fan, and the air intake drive is installed inside the air intake hood. The air intake hood is located above the exhaust port of the aluminum rod casting equipment. During operation, the aluminum rod casting equipment generates exhaust gas, and the air intake drive draws the exhaust gas into the air transfer pipe 11 through the air intake hood, and forms an airflow in the air transfer pipe 11, so that the exhaust gas flows to the settlement piece. The air transfer pipe 11 is made of metal. In the process of transmitting the exhaust gas, the heat of the exhaust gas can be dissipated outward, thereby achieving a cooling effect.

In step S1, during the transmission of the exhaust gas into the air transfer pipe 11, a portion of the coarse particles in the exhaust gas come into contact with and collide with the inner wall of the air transfer pipe 11, thereby decelerating the exhaust gas. During the transmission process, a portion of the particles are separated from the gas, and at the same time, the coarse particles are also blown toward the sedimentation piece by the airflow.

In step S2, after the exhaust gas enters the sedimentation piece from the air transfer pipe 11, the large particles of metal debris in the exhaust gas automatically settle under the action of gravity, and the flow rate of the exhaust gas is affected by the sedimentation piece, so that the flow rate of the exhaust gas is changed, thereby causing the exhaust gas to undergo preliminary sedimentation. In this embodiment, the exhaust gas flow rate is adjusted by changing the size of the internal space of the sedimentation piece. Since the size of the internal space of the sedimentation piece changes, the exhaust gas will experience a process of changing from fast to slow after entering the sedimentation piece, thereby extending the time the exhaust gas stays in the sedimentation piece, so that the exhaust gas and the coarse particles can be more fully settled.

2 and 4 , the sedimentation member includes a sedimentation pipe 2, which extends in a horizontal direction. One end of the sedimentation pipe 2 is connected to the air transmission pipe 11, and the other end of the sedimentation pipe 2 is closed. The inner diameter of the end of the sedimentation pipe 2 close to the air transmission pipe 11 is larger than the inner diameter of the air transmission pipe 11. The side wall of the sedimentation pipe 2 is fixed to the side wall of the separation filter box 3. The sedimentation pipe 2 and the separation filter box 3 are integrally arranged. An air inlet 21 connected to the separation chamber 31 is provided on the side of the sedimentation pipe 2 close to the separation filter box 3. The exhaust gas in the sedimentation pipe 2 can enter the separation chamber 31 through the air inlet 21. After the exhaust gas enters the sedimentation pipe 2 from the air transmission pipe 11, the gas flow rate decreases due to the change in the inner diameter, so that the coarse particles and debris fall downward to the bottom of the sedimentation pipe 2 under the action of gravity, thereby achieving initial sedimentation.

Referring to Figures 4 and 5, the bottom of the sedimentation pipe 2 is inclined, and the bottom of the sedimentation pipe 2 is inclined downward toward the separation filter box 3. The air inlet 21 is close to the bottom of the sedimentation pipe 2, and the inclination direction of the bottom wall of the air inlet 21 is consistent with the inclination direction of the bottom of the sedimentation pipe 2. The initially settled coarse particle debris separates from the exhaust gas and falls on the inner bottom wall of the sedimentation pipe 2, and can slide along the inclined bottom wall and fall into the bottom of the separation chamber 31 of the separation filter box 3, which is convenient for collection.

The inner diameter of the settling tube 2 gradually decreases in the direction away from the air transfer pipe 11, and the air inlet 21 is arranged along the extension direction of the settling tube 2. After the exhaust gas enters the settling tube 2 from the air transfer pipe 11, the gradually shrinking inner diameter can increase the contact probability between the exhaust gas and the inner wall of the settling tube 2. The flow resistance of the exhaust gas in the settling tube 2 increases, which helps to reduce the exhaust gas flow rate, so that the flow rate slows down when approaching the end of the settling tube 2, weakening the ability of the exhaust gas to carry particulate matter, and facilitating the sedimentation of particulate matter. As the inner diameter of the settling tube 2 decreases, the exhaust gas flow can easily change from a turbulent state to a laminar state. The flow rate in the laminar state is usually lower than the flow rate in the turbulent state, which helps to settle coarse particles and debris, thereby improving the sedimentation efficiency.

3 and 5, in the separation filter box 3, the separation chamber 31 is connected with the filter chamber 32, the separation chamber 31 is located below the filter chamber 32, the volume of the separation chamber 31 is larger than the internal volume of the sedimentation tube 2, the area of the vertical section of the separation chamber 31 is larger than the area of the internal vertical section of the sedimentation tube 2, in step S3, after the exhaust gas enters the separation chamber 31 from the sedimentation tube 2, the air flow velocity of the exhaust gas is reduced again due to the increase in the cross-sectional area, so that the exhaust gas is close to a floating state after the first sedimentation, and the coarse dust particles mixed in the exhaust gas are secondary settled under the action of gravity, and the secondary settled coarse dust particles fall to the bottom of the separation chamber 31, and the particle dust and debris are collected by the collecting assembly arranged at the bottom of the separation filter box 3.

3 and 5 , the collecting assembly includes a collecting and transferring box 5 located below the separation chamber 31. The collecting and transferring box 5 is installed on the bottom side of the separation and filtering box 3. The bottom of the separation and filtering box 3 is in the shape of a bucket. Specifically, the bottom of the separation and filtering box 3 is in the shape of an inverted trapezoidal table with a gradually reduced cross-section. A material drop hole is provided on the bottom side of the separation and filtering box 3. The material drop hole is connected to the separation chamber 31. The collecting and transferring box 5 extends in the horizontal direction. A material receiving hole 51 corresponding to the material drop hole is provided on the top side of the collecting and transferring box 5. A discharging motor 52 is installed at one end of the collecting and transferring box 5. The collecting and transferring box 5 is away from the discharging motor 52. One end is the discharging end, and the interior of the collecting and transferring box 5 is rotatably connected with a rotating rod 53, the driving end of the discharging motor 52 is connected to the rotating rod 53, and the rotating rod 53 is connected with a propeller belt 54. The bottom wall of the discharging end of the collecting and transferring box 5 is provided with an opening connected to the interior of the collecting and transferring box 5, and a dust collecting bag 55 is provided at the opening of the discharging end of the collecting and transferring box 5. A replacement component is provided at the bottom of the discharging end of the collecting and transferring box 5, and the dust collecting bag 55 is installed on the replacement component. During the process of performing steps S2-S4, when the dust collecting bag 55 is full of dust and debris, the dust collecting bag 55 is replaced by the replacement component.

The dust separated during the sedimentation process can fall on the inner bottom of the separation filter box 3, and enter the collection transfer box 5 through the drop hole and the receiving hole 51, so that the discharge motor 52 drives the rotating rod 53 to rotate, and the rotating rod 53 and the propeller belt 54 transport the dust to the discharge end of the collection transfer box 5, so that the collected dust falls into the ash bag 55 for collection. When the ash bag 55 is full of dust, the staff can remove the ash bag 55 for replacement through the replacement assembly.

5 and 6, the replacement assembly includes a fixed frame 6 and a transverse seat 61, the fixed frame 6 is connected to the collection transfer box 5, the transverse seat 61 is slidably connected to the inner side wall of the fixed frame 6, the transverse seat 61 slides in the horizontal direction, and the sliding direction of the transverse seat 61 is perpendicular to the extension direction of the collection transfer box 5. The side wall of the fixed frame 6 is provided with a transverse driving member 62, the transverse driving member 62 is a cylinder, and the driving end of the transverse driving member 62 is connected to the side wall of the transverse seat 61. The top side of the transverse seat 61 is plugged with a disassembly frame 63, and the number of the disassembly frame 63 is not less than two. In this embodiment There are two disassembly and assembly frames 63, and the disassembly and assembly frames 63 are arranged along the sliding direction of the transverse displacement seat 61. The disassembly and assembly frames 63 can be moved linearly in the vertical upward direction to remove the disassembly and assembly frames 63 from the transverse displacement seat 61. The top of the disassembly and assembly frames 63 is in the shape of an annular frame, and the middle part of the disassembly and assembly frames 63 is composed of multiple straight rods. The bottom of the disassembly and assembly frames 63 is in the shape of an annular frame. The top side of the transverse displacement seat 61 is provided with a stepped through groove 611 for the top of the disassembly and assembly frames 63 to be inserted and slided. The number of the stepped through grooves 611 is consistent with the number of the disassembly and assembly frames 63, and the dust collecting bag 55 is detachably connected to the disassembly and assembly frames 63.

During steps S2-S4, when one of the dust collecting bags 55 is full, the transverse driving component 62 drives the transverse moving seat 61 to move transversely, and another dust collecting bag 55 is replaced to be filled with dust. The dust collecting bag 55 filled with dust is connected to the disassembly frame 63 and removed from the transverse moving seat 61. Then, the dust collecting bag 55 is removed from the disassembly frame 63, and a new dust collecting bag 55 is replaced and installed on the disassembly frame 63. Then, the disassembly frame 63 is reinstalled on the transverse moving seat 61, thereby achieving the effect of uninterrupted dust collection.

A lifting and lowering driving member 64 is installed at the bottom of the fixed frame 6. The lifting and lowering driving member 64 is a cylinder. The driving end of the lifting and lowering driving member 64 is connected to the bottom of the lifting and lowering seat 65. The lifting and lowering driving member 64 can drive the lifting and lowering seat 65 to move in the vertical direction. The bottom of the disassembly and assembly frame 63 is connected to the plug ring 632. The top of the lifting and lowering seat 65 is provided with an annular groove 651 for inserting the plug ring 632 at the bottom of the disassembly and assembly frame 63. The bottom side of the discharge end of the collection and transfer box 5 is connected to the fixed seat 56. The bottom side of the fixed seat 56 is provided with an empty hole 57 that penetrates to the top side of the fixed seat 56. The empty hole 57 is connected to the discharge end opening of the collection and transfer box 5. The top side of the transverse seat 61 is against the bottom side of the fixed seat 56. Nearly, the hole wall of the empty hole 57 is connected with a sweeping frame 571, and the bottom of the sweeping frame 571 is provided with a sweeping bristle 572, and the bottom end height position of the sweeping bristle 572 is lower than the top side height position of the transverse displacement seat 61, the fixed frame 6 is connected with the bottom of the fixed seat 56, the top of the disassembly frame 63 is provided with an insertion block 631, and the bottom side of the fixed seat 56 is provided with a socket 561 for the insertion of the insertion block 631, and the insertion block 631 of the disassembly frame 63 is plugged into the bottom side of the fixed seat 56, and a pressure sensor 652 is provided on the top of the lifting and lowering seat 65. When the dust collecting bag 55 is used to collect dust, the bottom of the dust collecting bag 55 is close to the pressure sensor 652, and the pressure sensor 652 is electrically connected to the lifting and lowering drive component 64.

When the dust collecting bag 55 is filled with dust, the dust collecting bag 55 expands and deforms, and the bottom of the dust collecting bag 55 applies pressure to the pressure sensor 652. The pressure sensor 652 senses the expected pressure value, and the lifting and lowering drive component 64 drives the lifting and lowering seat 65 to descend, so that the transverse driving component 62 drives the transverse seat 61 to move transversely, and replaces another dust collecting bag 55 for loading dust. During the transverse movement, the sweeping hair 572 can sweep the dust that falls on the top side of the transverse seat 61, and sweep the dust into the dust collecting bag 55 that needs to be loaded with dust, thereby reducing the dust remaining on the top side of the transverse seat 61 and being carried out of the fixed seat 56 by the transverse seat 61, reducing dust leakage, and reducing the pollution of the working environment.

The ash bag 55 is detachably connected to the disassembly frame 63. The ash bag 55 is located on the inner side of the disassembly frame 63. A connecting ring 551 is provided at the bag opening of the ash bag 55. The connecting ring 551 is plugged into the plug block 631. The plug block 631 passes through the connecting ring 551. When replacing the ash bag 55, the connecting ring 551 and the ash bag 55 can be taken out upwards.

3 and 7 , a partition 34 is connected to the inner wall of the separation filter box 3, which separates the filter chamber 32 from the isolation chamber 33. The air filter assembly includes a plurality of dust bags 341, which are made of glass fiber needle felt or stainless steel fiber needle felt. A vent is provided on the bottom side of the partition 34, and the dust bags 341 are installed at the vent. An air outlet pipe 35 is connected to the outer side of the separation filter box 3, and the air outlet pipe 35 is connected to the isolation chamber 33. In step S4, the gas enters the isolation chamber 33 after being filtered by the dust bag 341, and then enters the air outlet pipe 35 from the isolation chamber 33. The gas in the air outlet pipe 35 is drawn into the exhaust chimney 4 through the exhaust drive 351. The exhaust drive 351 is a fan arranged on the outer side of the air outlet pipe 35. The suction end of the exhaust drive 351 is connected to the air outlet pipe 35, and the exhaust end of the exhaust drive 351 is connected to the exhaust chimney 4.

After the exhaust gas enters the separation chamber 31 for secondary sedimentation, the gas part is lighter in weight, so it floats upward into the filter chamber 32, and then passes through the inside of the dust filter bag 341 from the outside, and then enters the isolation chamber 33 from the vent hole. The fine dust in the exhaust gas after the secondary sedimentation is blocked by the dust filter bag 341, and is thus retained on the outer wall of the dust filter bag 341. In this state, the gas in the isolation chamber 33 has completed the sedimentation and filtration of the particulate dust, and has been purified and can be discharged, thereby reducing the emission of exhaust gas, so as to achieve an environmental protection effect and reduce air pollution.

Add step S5 after step S4: start the dust removal drive 39, and intermittently spray the bag opening of the dust filter bag 341 in the dust removal chamber through the vent. The dust removal drive 39 is a fan or an air compressor. The dust removal drive 39 is installed on the outer top wall of the separation filter box 3, and the air outlet end of the dust removal drive 39 corresponds to the position of the vent.

As the filtering time increases, more and more dust adheres to the dust filter bag 341, which increases the air permeability resistance of the dust filter bag 341, causing the amount of gas that can be processed to gradually decrease. Therefore, the dust removal drive 39 is used to intermittently blow air to the dust filter bag 341, and the air is instantly sprayed to the dust filter bag 341 at high speed, while inducing the surrounding clean air to enter the dust filter bag 341, causing the dust filter bag 341 to expand sharply in an instant, causing the dust layer attached to the surface of the dust filter bag 341 to fall off, and the dust filter bag 341 restores its filtering capacity. The fallen dust falls into the separation chamber 31, and then falls into the collection transfer box 5 for collection.

3 and 8 , the air filter assembly further includes an outer cage frame 342 and an inner cage frame 343. The outer cage frame 342 is connected to the bottom of the partition 34. The inner cage frame 343 and the dust filter bag 341 are detachably mounted on the top of the partition 34. The inner cage frame 343 and the dust filter bag 341 extend into the filter chamber 32 through the vent hole. The outer cage frame 342 is covered on the peripheral side of the dust filter bag 341. The dust filter bag 341 is located between the outer cage frame 342 and the inner cage frame 343. The dust filter bag 341 is sleeved on the outer peripheral side of the inner cage frame 343.

During filtering, the inner cage frame 343 supports the inner side of the dust bag 341 to prevent the dust bag 341 from shrinking. During jetting, the outer cage frame 342 can limit the outer side of the dust bag 341 to reduce the excessive expansion and deformation of the dust bag 341 and the tearing between the dust bag 341 and the inner cage frame 343 when the wind is too strong.

The top side of the partition 34 is rotatably connected with a rotating ring 36, the top of the inner cage frame 343 is in the shape of an annular frame, the bag opening of the dust filter bag 341 and the top of the inner cage frame 343 are installed on the top of the rotating ring 36 by bolts, the bag opening of the dust filter bag 341 is located between the top side of the inner cage frame 343 and the rotating ring 36, the side wall of the rotating ring 36 is connected with an extension rod 361, and a rotating driving member 37 is provided on the top of the partition 34. The rotating driving member 37 is a cylinder, and the driving end of the rotating driving member 37 is connected with a driving rod 38. The side wall of the driving rod 38 is rotatably connected with one end of the extension rod 361 away from the rotating ring 36 through a rotating shaft, and the driving rod 38 is slidably matched with the top side of the partition 34. When the driving rod 38 slides, it can drive the extension rod 361 and the rotating ring 36 to rotate.

When it is necessary to clean the dust on the dust filter bag 341, the rotating driving member 37 drives the driving rod 38 to slide, and drives the extending rod 361 to drive the rotating ring 36 to rotate, thereby driving the inner cage frame 343 and the dust filter bag 341 to rotate. When the dust filter bag 341 rotates, the outer side of the dust filter bag 341 rubs against the inner side of the outer cage frame 342, so that the outer cage frame 342 scrapes the dust on the dust filter bag 341 to make the dust fall off, thereby achieving the effect of dust cleaning.

The separation filter box 3 is cast by a concrete, and the concrete is as follows:

In this embodiment, a concrete and a preparation process of the concrete are also disclosed.

A concrete, the raw materials of which include 300kg of cement, 150kg of fly ash, 755kg of crushed stone with continuous grading of 5-12mm, 245kg of aluminum slag, 400kg of fine sand with a fineness modulus of 2.4-2.8, 4kg of water reducer, 45kg of organosilicon modified acrylic emulsion and 165kg of water, wherein the water reducer includes polycarboxylate water reducer and sodium lignin sulfonate, and the weight ratio of the polycarboxylate water reducer to the sodium lignin sulfonate is 3:1; the organosilicon modified acrylic emulsion adopts the organosilicon modified acrylic emulsion with model HBC-3000 produced by Beijing Huyi.

The concrete preparation process includes the following steps:

Q1: 60kg cement and 33kg water were uniformly mixed to obtain bonding slurry;

Q2: Add aluminum slag to the bonding slurry, stir evenly, pour into the mold, dry, shape and crush, and prepare pretreated aluminum slag with a particle size range of 5-12mm;

Q3: Add the pretreated aluminum slag into the silicone modified acrylic emulsion, stir evenly, and let it stand for 30 minutes. Then separate the pretreated aluminum slag from the silicone modified acrylic emulsion and dry it to obtain modified aluminum slag with a moisture content of less than 0.1%;

Q4: Evenly mix the water reducer with 132 kg of water to obtain an admixture solution;

Q5: Add 240kg of cement and fly ash into the admixture solution and mix evenly to obtain cement slurry;

Q6: Add crushed stone, fine sand and modified aluminum slag into cement slurry, mix well to obtain concrete.

The aluminum slag is first pre-modified with a bonding slurry made of cement and water, and then modified with an organosilicon-modified acrylic emulsion, and the water content of the modified aluminum slag is controlled to be lower than 0.1%. This is conducive to obtaining corrosion-resistant concrete with a low chloride ion migration coefficient, a small steel bar corrosion weight loss rate and good sulfate corrosion resistance. It can obtain concrete with good corrosion resistance that can be used for a long time in an open air environment.

The implementation principle of the embodiment of the present application is: through two sedimentation steps, the metal particles and coarse particles such as dust in the exhaust gas are separated from the exhaust gas in turn, and then the remaining fine particles of dust in the exhaust gas are separated from the gas through the dust filter bag 341, thereby completing the gas filtration and purification. When the gas is discharged, the metal particles and dust carried in the exhaust gas can be reduced. During the sedimentation and filtration process, the exhaust gas and debris dust can be fully separated, which can reduce the pollution of the gas discharged after filtration to the environment, thereby achieving the effect of environmentally friendly exhaust.

The above are all preferred embodiments of the present application. The embodiments are only explanations of the present application and do not limit the protection scope of the present application in turn. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims (10)

1. An environment-friendly dust removal and exhaust method is characterized by comprising the following steps:

s1: the aluminum bar casting waste gas enters a gas transmission pipeline (11) through the gas inlet component (1);

S2: the waste gas enters a settling piece through a gas transmission pipeline (11) to carry out preliminary settlement, and enters a separation cavity (31) of the separation filter box (3) after the preliminary settlement;

S3: the waste gas enters a separation cavity (31) for secondary sedimentation, and then enters a filter cavity (32) for filtration;

S4: the waste gas entering the filter cavity (32) is filtered through the filter gas component, the filtered gas enters the isolation chamber (33), and then the gas in the isolation chamber (33) is transferred to the exhaust chimney (4) to be discharged.

2. The method for environmental protection, dust removal and exhaust as set forth in claim 1, wherein in step S2, after the exhaust gas enters the settling member from the gas transfer pipe (11), the exhaust gas is primarily settled by affecting the flow rate of the exhaust gas.

3. The environment-friendly dust removal and exhaust method according to claim 2, wherein the sedimentation piece comprises a sedimentation pipe (2), the sedimentation pipe (2) is communicated with the gas transmission pipeline (11), an air inlet (21) communicated with the separation cavity (31) is formed in the side wall of the sedimentation pipe (2), waste gas in the sedimentation pipe (2) can enter the separation cavity (31) through the air inlet (21), and the bottom of the sedimentation pipe (2) is obliquely arranged.

4. An environmental protection dust removal and exhaust method according to claim 3, characterized in that the inner diameter of the sedimentation pipe (2) is gradually reduced along the direction away from the gas transmission pipeline (11), and the air inlets (21) are arranged along the direction away from the gas transmission pipeline (11).

5. The method for environmental protection, dust removal and exhaust according to claim 1, wherein in step S3, after the exhaust gas enters the separation chamber (31), the coarse particle dust which is secondarily settled falls to the bottom of the separation chamber (31) and is collected by a collection component arranged at the bottom of the separation filter box (3).

6. The environment-friendly dust removal and exhaust method according to claim 5, wherein the collecting assembly comprises a collecting and transferring box (5) positioned below the separating cavity (31), an ash collecting bag (55) is arranged at the discharging end of the collecting and transferring box (5), and the ash collecting bag (55) is replaced through a replacing assembly arranged on the collecting and transferring box (5) when the ash collecting bag (55) is full of dust in the process of steps S2-S4.

7. The environment-friendly dust removal and exhaust method according to claim 6, wherein the replacement assembly comprises a fixing frame (6) and a transverse moving seat (61), the fixing frame (6) is connected with the collection and transfer box (5), the transverse moving seat (61) is slidably connected with the fixing frame (6), a disassembly and assembly frame (63) is detachably arranged on the transverse moving seat (61), the number of the disassembly and assembly frames (63) is not lower than two, and the dust collection bag (55) is connected with the disassembly and assembly frames (63).

8. The method for environmental protection, dust removal and exhaust according to claim 1, wherein in step S4, the gas enters the air outlet pipe (35) after being filtered by the gas filtering component, and the exhaust driving member (351) pumps the gas in the air outlet pipe (35) into the exhaust chimney (4).

9. The method for environmental protection, dust removal and exhaust as set forth in claim 8, wherein step S5 is added after step S4: and starting the dust removing driving piece (39) to intermittently jet air to the air filtering component in the dust removing chamber.

10. The environment-friendly dedusting and exhausting method according to claim 8, wherein the air filtering assembly comprises a dust filtering bag (341), a partition plate (34) is arranged in the separation filtering box (3), the partition plate (34) is provided with a vent hole, the dust filtering bag (341) is arranged at the vent hole, the air filtering assembly further comprises an outer cage frame (342), the outer cage frame (342) is connected with the partition plate (34), and the outer cage frame (342) is covered on the periphery of the dust filtering bag (341).