Wet dust removal device for removing waste powder from asphalt mixing station

Abstract

The utility model discloses asphalt mixing station waste powder removal wet method dust collector relates to waste powder removal technical field, including waste powder recovery bin, waste powder recovery bin is connected with screw conveyer through the discharge gate, the top of screw conveyer and spray tank are linked, be provided with spray set in the spray tank, be provided with stirring cage at the discharge gate in waste powder recovery bin, the bottom of waste powder recovery bin is provided with air hammer, the utility model discloses the above-mentioned asphalt mixing station waste powder removal wet method dust collector, and the effect of removing powder is good, and the influence to the surrounding atmospheric environment is subtle, and the health safety of staff is guaranteed to the maximum, reaches the powder effect of high -efficient, fast, economic, safe and environmental protection of removing.

Description

Technical Field

[0001] This utility model relates to the field of waste powder removal technology, and in particular to a wet dust removal device for waste powder removal in asphalt mixing plants. Background Technology

[0002] Asphalt mixing plant waste dust removal systems are widely used in highway construction, but many shortcomings still exist that require in-depth research and improvement, especially the dust removal process and quality control during the process. Therefore, a thorough analysis, summary, and research of asphalt mixing plant waste dust removal systems is essential.

[0003] In practical engineering applications, the mechanical design, installation, and dust removal technology of waste dust removal systems are still imperfect. Furthermore, given the widespread application of this system in highways, developing a mature dust removal technology and process would provide valuable guidance for future projects.

[0004] In recent years, my country's highway construction has developed rapidly, with projects spread throughout the country. Therefore, the efficient, economical, and environmentally friendly disposal of waste dust from asphalt mixing plants has become crucial. Currently, waste dust disposal mainly involves dry and wet methods. Dry methods generate significant dust and pollute the environment; wet methods consume large amounts of water, have inconvenient wastewater discharge, and the amount of water used to humidify the waste dust is difficult to control. Therefore, it is essential to design a waste dust disposal system that can avoid dust generation while minimizing water consumption. Utility Model Content

[0005] The purpose of this invention is to provide a wet dust removal device for waste powder removal in asphalt mixing plants, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides a wet dust removal device for waste powder removal in asphalt mixing plants, including a waste powder recovery bin. The waste powder recovery bin is connected to a screw conveyor through a discharge port. The top of the screw conveyor is connected to a spray tank. A spraying device is installed in the spray tank. An agitator is installed in the waste powder recovery bin at the discharge port. An air hammer is installed at the bottom of the waste powder recovery bin.

[0007] Preferably, the waste powder recovery bin of the spraying device is equipped with an upper limit level gauge and a lower limit level gauge, with the upper limit level gauge located above the lower limit level gauge.

[0008] Preferably, one end of the agitator is fixedly connected to the output shaft of motor one, and one end of the screw conveyor is connected to the output shaft of motor two.

[0009] Preferably, the water inlet of the spray device is connected to a water supply pipe, the water supply pipe is connected to a three-phase submersible pump installed in a water storage tank, and a manual valve is installed on the water supply pipe.

[0010] Preferably, the screw conveyor is provided with a discharge port at its bottom, which is located above the waste powder recycling vehicle.

[0011] Preferably, the spraying device is made of two steel pipes in an H shape, with two rows of spray holes drilled alternately on the steel pipes, and the spray holes are offset from the shaft of the screw conveyor.

[0012] Preferably, the discharge port is connected to the screw conveyor using a canvas.

[0013] Therefore, the wet dust removal device for waste powder removal in asphalt mixing plants described above has the following beneficial effects: (1) Water conservation. Because it is atomized humidification, the amount of water used is greatly reduced, and at the same time, no wastewater pollution is caused to the environment.

[0014] (2) It has a good dust removal effect and can ensure the health and safety of staff.

[0015] (3) Since the entire set of equipment does not use high-power equipment, the energy consumption is very low, which is conducive to saving costs.

[0016] (4) The structure is simple and easy to operate.

[0017] (5) Easy to maintain and low failure rate. Even if a failure occurs, the problem can be found quickly.

[0018] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a system schematic diagram of an embodiment of the wet dust removal device for waste powder removal in asphalt mixing plants according to this utility model; Figure 2 This is a cross-sectional view of the spray device in an embodiment of the wet dust removal device for waste powder removal in asphalt mixing plants according to this utility model; Figure 3 This is a schematic diagram of the FKL100 air hammer structure of an embodiment of the wet dust removal device for waste powder removal in asphalt mixing plants according to this utility model; Figure 4 This is an operation flowchart of an embodiment of the wet dust removal device for waste powder removal in asphalt mixing plants according to this utility model; Figure 5 This is a circuit diagram of the waste powder removal system of an embodiment of the wet dust removal device for asphalt mixing plants of this utility model; Attached reference numerals: 1. Waste powder recycling bin; 2. Upper limit level gauge; 3. Water storage tank; 4. Three-phase submersible pump; 5. Water conveying pipe; 6. Manual valve; 7. Spraying device; 8. Agitator; 9. Motor 1; 10. Air hammer; 11. Lower limit level gauge; 12. Powder conveying pipe; 13. Motor 2; 14. Screw conveyor; 15. Waste powder recycling vehicle; 16. Discharge port; 17. Feed outlet. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Example Please see Figures 1-5 This utility model provides a wet dust removal device for waste powder removal in asphalt mixing plants, including a waste powder recovery bin 1. For the construction needs of the project in this embodiment, the mixing plant should be equipped with a steel bin with a length of 3m, a width of 2m, a height of 2m, and a wall thickness of 12mm.

[0023] The waste powder recycling bin 1 is connected to the powder conveying pipe 12 at its inlet. The waste powder recycling bin 1 is connected to the screw conveyor 14 through the discharge port 16. The screw conveyor 14 is a steel screw conveyor with a diameter of 250mm, a wall thickness of 10mm, and a length of 7m.

[0024] The top of the screw conveyor 14 is connected to the spray tank, and a spraying device 7 is installed in the spray tank. A stirring cage 8 is installed in the waste powder recovery bin 1 at the discharge port 16, and an air hammer 10 is installed at the bottom of the waste powder recovery bin 1.

[0025] The waste powder recovery bin 1 of the spray device 7 is equipped with an upper limit level gauge 2 and a lower limit level gauge 11, with the upper limit level gauge 2 located above the lower limit level gauge 11.

[0026] One end of the stirring cage 8 is fixedly connected to the output shaft of motor 9, and one end of the screw conveyor 14 is connected to the output shaft of motor 13. In this embodiment, two Y132S-4 geared motors with a power of 5.5KW are used.

[0027] The inlet of the sprinkler device 7 is connected to the water supply pipe 5, which is connected to the three-phase submersible pump 4 installed in the water storage tank 3. A manual valve 6 is installed on the water supply pipe 5. In this embodiment, a three-phase submersible pump with model number QSD10-70 / 3-1.1 and power of 2.0KW is used.

[0028] Manual valve control is crucial in the operation of the dust removal device. Because it is manually controlled, opening the valve too wide or too narrowly will significantly affect the dust removal effect. If the valve is opened too wide, the water consumption will increase, which, while beneficial for dust removal, can easily form sludge and cause environmental pollution. If the valve is opened too narrowly, it can easily generate dust, resulting in poor dust removal.

[0029] like Figure 2 As shown, the spray device 7 is mainly composed of two 50mm diameter steel pipes arranged in an H shape, with a water inlet at the connection point. The ends of the steel pipes are welded together. Holes are drilled at the bottom of each pipe using a 3mm drill bit, spaced 150mm apart, in two staggered rows with a 20mm gap. To ensure the atomized water effectively reaches the waste powder, the drilling direction must be offset from the shaft of the screw conveyor 14 by 10-20mm. Simultaneously, to guarantee water supply, the three-phase submersible pump must provide a pressure of 6-7 kg.

[0030] The discharge port 16 is connected to the screw conveyor 14 by a canvas. The bottom of the screw conveyor 14 is provided with a discharge port 17, which is located above the waste powder recycling vehicle 15.

[0031] like Figure 3 As shown, the air hammer used in this embodiment is the Swiss Findeva FKM-mi series FKL100. One of the features of this air hammer is that its impact frequency is adjustable from 0.5 to 200 times per minute (6 times / min is used in this project), and the impact force can be set in three levels. The impact force can be set by the position of the exhaust port; opening the uppermost exhaust port = maximum impact force; opening the lowermost exhaust port = minimum impact force; the frequency can be adjusted by the throttle valve; the air hammer has a base plate for mounting and transmitting impact force. The air hammer shell and base plate are made of aluminum, and the impact plate (connected to the base plate) is made of special impact-resistant plastic.

[0032] The structure and working mode of this air hammer are as follows: Inside its vibrator, a piston is compressed by air, pushing against a spring. Each time the piston passes through the exhaust port, a strong exhaust is generated. The piston, pushed by the spring, impacts the impact plate inside the air hammer. Then, the piston closes the exhaust port, and the above process is repeated at the speed set by the throttle valve.

[0033] Too many or too few blows of the pneumatic hammer into the recovery bin per unit time will have adverse effects. Too many blows will affect the lifespan of other equipment in the recovery bin; while too few blows will hinder the discharge of waste powder. Taking into account the actual conditions of the mixing plant and the conditions of the powder removal device itself, this embodiment sets the working frequency of the pneumatic hammer at 6 times per minute as optimal.

[0034] like Figure 4 As shown, the waste powder collection bin 1 collects the waste powder discharged from the powder conveying pipe 12. When the waste powder height reaches the upper limit, the upper limit level gauge 2 receives a signal, and simultaneously, the three-phase submersible pump 4, motor 9, and motor 13 in the water storage tank are turned on through the three-phase alternating current converter. The three-phase submersible pump 4 supplies water to the water conveying pipe 5, and the manual valve 6 is opened, allowing the spray device 7 to pre-wet the screw conveyor 14 (the water flow rate is controlled by the manual valve 6). When the circuit is connected, the air hammer 10 intermittently strikes the waste powder collection bin 1 after a delay of several seconds to facilitate the discharge of waste powder. The waste powder is discharged from the waste powder collection bin 1, stirred by the agitator 8, and then conveyed by the screw conveyor 14 to the spray device 7, where the atomized water humidifies the waste powder, thereby achieving the purpose of dust removal. When the waste powder height reaches the lower limit, the signal received by the lower limit level gauge 11 controls the three-phase AC, the stirring cage 8, the screw conveyor 14, the motor 9, the motor 13 and the air hammer 10 to stop working.

[0035] When the waste powder level in waste powder recovery bin 1 reaches its upper limit, the upper limit level gauge 2 receives the waste powder level signal. Its own contact switch automatically closes and transmits the signal to the main switch via a weak current. The main switch mainly consists of three three-phase AC contactors and one two-phase AC contactor, which control the three-phase submersible pump 4, motor 9, motor 13, and air hammer 10, respectively. When the signal current from the upper limit level gauge 2 arrives, it causes the AC contactor switch to close through the coil, forming a complete circuit (at this time, the lower limit level gauge 11 switch is closed). After the circuit is connected, the three-phase submersible pump 4, motor 9, and motor 13 start working, and the powder removal process begins. The air hammer 10, controlled by a time relay, strikes the waste powder recovery bin 1 at a frequency of 6 times per minute after a 10-second delay, facilitating the discharge of waste powder. When the waste powder level in the waste powder recovery bin 1 reaches the lower limit, the contact switch of the lower limit level gauge 11 automatically disconnects (at this time, the contact switch of the upper limit level gauge 2 also disconnects), thus forming a complete circuit break. The three-phase submersible pump 4, motor 1 9, motor 2 13, and air hammer 10 stop working, and the powder removal process is paused. The circuit diagram is shown below. Figure 5 As shown.

[0036] The common problems and preventive measures during the dust removal process are summarized below: 1. The nozzle or pipeline is blocked: This manifests as a sudden increase in pressure in the three-phase submersible pump.

[0037] Preventive measures: (1) Install three filters at the inlet of the three-phase submersible pump and treat the filters frequently.

[0038] (2) Debris passing through the filter screen can cause blockage of the spray device, so the spray device should be cleaned frequently.

[0039] 2. Waste powder recycling bin does not discharge: This is manifested by increased resistance or sudden stop when the agitator is working.

[0040] (1) Before starting the asphalt mixing plant, the mixing cage should be inspected, and any debris should be cleaned up in time.

[0041] (2) Check whether the wiring, switches and other parts of the device are damaged. Replace aging switches or wiring in time to ensure that there are no safety hazards.

[0042] (3) Check whether the motor is working properly. If a fault occurs, it should be repaired in time.

[0043] Monitoring of the surrounding environment during dust removal: Because the recovered waste powder particles are microparticles, with a particle size between 2.5 and 10 micrometers, and suspended in the air, these small particles enter the respiratory system when a person breathes, adhering to the trachea or lung walls, posing a significant health hazard. This project achieves a waste powder removal efficiency of up to 99.3%. To further observe the negative impacts of the removal process on the surrounding atmospheric environment, we randomly selected 10 points within a 300m radius of the removal device and continuously monitored the air under the same conditions for 24 hours. The instrument used was a cone element oscillating microbalance (TEOM). The test results are shown in the table below. Table 1 Test Results Unit: d g / m 3

[0044] The local baseline concentration is 30 g / m³ of PM2.5 per 24 hours. 3 .

[0045] Data shows that the dust removal device designed for this project has a good dust removal effect, minimal impact on the surrounding atmospheric environment, maximizes the health and safety of employees, and enhances the company's positive image.

[0046] Therefore, this utility model adopts the above-mentioned wet dust removal device for asphalt mixing plant waste powder removal, which has good dust removal effect, minimal impact on the surrounding atmospheric environment, and maximizes the health and safety of workers, achieving efficient, fast, economical, safe and environmentally friendly dust removal effect. Specifically: (1) Water conservation. Because it uses atomized humidification, the water consumption is greatly reduced, and at the same time, no wastewater pollution is caused. The water consumption comparison between the designed and undesigned spray systems is as follows: Table 2 Comparison of Water Consumption

[0047] (2) It has a good dust removal effect and can ensure the health and safety of staff.

[0048] (3) Since the entire set of equipment does not use high-power equipment, the energy consumption is very low, which is conducive to saving costs.

[0049] (4) The structure is simple and easy to operate.

[0050] (5) Easy to maintain and low failure rate. Even if a failure occurs, the problem can be found quickly.

[0051] Issues and suggestions for improvement: The sensitivity of the sensors on the upper and lower main rotors of the level gauge needs to be improved to accurately locate the waste powder, making the entire system more economical and efficient. In practical operation, close attention should be paid to the adjustment of the manual valves, and relevant experience should be accumulated to better control the quality of powder removal.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A wet dust removal device for waste powder disposal at asphalt mixing plants, characterized in that: It includes a waste powder recycling bin, which is connected to a screw conveyor through a discharge port. The top of the screw conveyor is connected to a spray tank, and a spraying device is installed in the spray tank. An agitator is installed in the waste powder recycling bin at the discharge port, and an air hammer is installed at the bottom of the waste powder recycling bin.

2. The wet dust removal device for waste powder removal in asphalt mixing plants according to claim 1, characterized in that: The waste powder recycling bin is equipped with an upper limit level gauge and a lower limit level gauge, with the upper limit level gauge located above the lower limit level gauge.

3. The wet dust removal device for waste powder removal in asphalt mixing plants according to claim 2, characterized in that: One end of the agitator is fixedly connected to the output shaft of motor one, and one end of the screw conveyor is connected to the output shaft of motor two.

4. The wet dust removal device for waste powder removal in asphalt mixing plants according to claim 3, characterized in that: The water inlet of the spray device is connected to a water supply pipe, which is connected to a three-phase submersible pump installed in a water storage tank. A manual valve is installed on the water supply pipe.

5. The wet dust removal device for waste powder removal in asphalt mixing plants according to claim 4, characterized in that: The screw conveyor is equipped with a discharge port at its bottom, which is located above the waste powder recycling vehicle.

6. The wet dust removal device for waste powder removal in asphalt mixing plants according to claim 5, characterized in that: The spraying device is made of two steel pipes in an H shape, with two rows of spray holes drilled alternately on the steel pipes, and the spray holes are offset from the shaft of the screw conveyor.

7. The wet dust removal device for waste powder removal in asphalt mixing plants according to claim 6, characterized in that: The discharge port is connected to the screw conveyor via a canvas.

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