An asphalt mixture mixing dust removal system and process

Abstract

The present invention discloses an asphalt mixture stirring and dust removal system and process, including a powder-coated oil dust removal device which is composed of a powder-coated oil device and a first bag filter. The air inlet end of the powder-coated oil device is used to receive the dust generated by batching. The powder-coated oil device includes a fourth dust suction main pipe, a powder spraying pipe, a blower and a powder spraying tank. A vortex pipe section is arranged on the fourth dust suction main pipe, and a feed branch pipe located on the feed side of the vortex pipe section is arranged on the side wall of the fourth dust suction main pipe. The discharging direction of the feed branch pipe is parallel to the air outlet direction of the fourth dust suction main pipe. The bottom discharging ports of the powder spraying tank are respectively connected to the powder inlet of the powder spraying pipe and the air outlet of the blower. The discharging port of the powder spraying pipe is connected to the side wall of the fourth dust suction main pipe, and the discharging port direction of the powder spraying pipe is parallel to the air outlet direction of the fourth dust suction main pipe. The whole system is reasonably designed, the process is simple and ingenious, the dust and flue gas removal efficiency is high, the treatment effect is good, and the purpose of green environmental protection is achieved.

Description

[0001] This invention is a divisional application of the invention patent application with the application number 201810570270.4, the application date of June 5, 2018, and the title of "An Environmental Protection Treatment System and Process for Asphalt Mixture Stirring". Technical Field

[0002] This invention belongs to the technical field of environmental protection treatment of asphalt mixture mixing plants, and particularly relates to an asphalt mixture mixing dust removal system and process. Background Art

[0003] Asphalt mixture mixing equipment is a mechanical device for producing and mixing various asphalt mixtures, and is an important equipment for road construction and maintenance. During the production process of hot mix mixtures, asphalt mixture mixing equipment will generate a large amount of waste gas, mainly asphalt fumes and dust. Among them, high-temperature asphalt will generate a large amount of asphalt fumes at the exhaust port of the asphalt tank and the discharge point of the mixing pot; the dust generated during the production processes such as batching, feeding, mixing, and discharging drifts everywhere, which will not only seriously affect the health of operators, but also cause serious pollution to the equipment and the surrounding environment, such as causing haze and affecting the lives of surrounding residents. In order to prevent the waste gas from harming human health and polluting the surrounding environment, it is necessary to effectively contain it and improve the air quality of the surrounding environment.

[0004] Among them, the characteristics of asphalt fumes are easy to adhere and flammable and explosive above a certain temperature. During the collection, transportation, and fume elimination of asphalt fumes, it is extremely easy to adhere to the surface of pipelines and equipment to form liquid to solid asphalt; the solidified asphalt is very difficult to remove, often causing pipeline blockage and equipment damage, making the system unable to operate normally. In addition, the components of asphalt fumes are extremely complex and vary with the source of asphalt; there are both solid and liquid particles condensed from asphalt volatile components in asphalt fumes, and organic substances in a vapor state, and some organic substances are high molecular polymers, which will cause serious pollution to the environment. The various organic substances contained in the fumes include carbon ring hydrocarbons, derivatives of cyclic hydrocarbons and other compounds, many of which are harmful to human health. Asphalt fumes contain various polycyclic aromatic hydrocarbon substances such as benzo[a]pyrene, benzo[a]anthracene, and carbazole, and most of them are carcinogenic and strongly carcinogenic substances. The particle size is mostly between 0.1 and 1.0 μm, the smallest is only 0.01 μm, and the largest is about 10.0 μm. It is a variety of carcinogenic substances represented by 3,4-benzo[a]pyrene, which can adhere to the dust with a diameter of less than 8 μm and be inhaled into the body through the respiratory tract, endangering human health.

[0005] Regarding the environmental protection requirements of asphalt mixing equipment, mainly three points need to be solved: dust needs to be centrally treated in an organized manner; asphalt fumes need to be centrally treated in an organized manner; and the noise during the operation of the equipment needs to be effectively controlled. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide an asphalt mixture mixing dust removal system and process, which can centrally treat dust and asphalt fumes in an organized manner, and at the same time reduce the noise generated by the operation of the equipment.

[0007] To solve the above technical problem, a technical solution adopted by the present invention is: an asphalt mixture mixing dust removal system, including a batching dust collection device, a discharge and feeding dust and smoke collection device, a powder-coated oil dust removal device and a recycled powder humidification device. The batching dust collection device is composed of a cold material enclosure device and a cold material dust suction device. The cold material enclosure device is arranged outside the batching system, and the air inlet end of the cold material dust suction device penetrates into the cold material enclosure device. The discharge and feeding dust and smoke collection device is composed of a lane enclosure device and a discharge and feeding dust suction device. The lane enclosure device is arranged at the bottom passage position of the mixing plant, and the air inlet end of the discharge and feeding dust suction device penetrates into the lane enclosure device. The powder-coated oil dust removal device is composed of a powder-coated oil device and a first bag filter. The air outlet end of the cold material dust suction device is connected to the air inlet end of the powder-coated oil device, the air outlet end of the discharge and feeding dust suction device is connected to the air inlet end of the powder-coated oil device, the air outlet end of the powder-coated oil device is connected to the air inlet end of the first bag filter, the discharge end of the first bag filter is connected to the feeding end of the recycled powder humidification device, and the batching dust collection device, the discharge and feeding dust and smoke collection device, the powder-coated oil dust removal device and the recycled powder humidification device are all electrically connected to the control device.

[0008] Preferably, the cold material enclosure device includes a primary aggregate enclosure device. The primary aggregate enclosure device includes a first support frame and a plurality of first sealing plates fixed on the first support frame. The first support frame is arranged around a row of primary aggregate bins, and the first sealing plates surround the left side, right side, rear side and top side of a row of primary aggregate bins. The cold material dust suction device includes a primary aggregate dust suction device. The primary aggregate dust suction device includes a first dust suction main pipe, a plurality of first dust suction hoods and a plurality of first dust suction branch pipes. The air outlet end of the first dust suction main pipe is connected to the air inlet end of the powder-coated oil device through a first electric air damper. The first dust suction main pipe penetrates into the primary aggregate enclosure device and is fixed on the first support frame. A plurality of first dust suction joints and a plurality of second dust suction joints are arranged on the side wall of the first dust suction main pipe. The first dust suction joint is connected to the air outlet end of the corresponding first dust suction hood through a first pneumatic butterfly valve. The first dust suction hood is located above the rear of the corresponding primary aggregate bin, and the air inlet end of the first dust suction hood faces above the feeding port of the corresponding primary aggregate bin. The second dust suction joint is connected to the air outlet end of the corresponding first dust suction branch pipe. The air inlet end of the first dust suction branch pipe is located beside the discharge port of the primary aggregate bin, and a first manual butterfly valve is arranged at the air inlet end of the first dust suction branch pipe.

[0009] Preferably, the native aggregate enclosure device further comprises a second support frame and a plurality of second sealing plates fixed on the second support frame. The second support frame is arranged around the native aggregate inclined conveyor belt and the native aggregate cold vibrating screen, and the second sealing plates surround the native aggregate inclined conveyor belt and the native aggregate cold vibrating screen; the native aggregate dust suction device further comprises a second dust suction hood body. A third dust suction joint is arranged on the side wall of the first dust suction main pipe. The third dust suction joint is connected to the air outlet end of the second dust suction hood body through a second electric air valve. The air inlet end of the second dust suction hood body is located directly above the native aggregate cold vibrating screen.

[0010] Preferably, the cold material enclosure device further comprises a recycled material enclosure device. The recycled material enclosure device comprises a third support frame and a plurality of third sealing plates fixed on the third support frame. The third support frame is arranged around a row of recycled material bins, and the third sealing plates surround the left side, right side, rear side and top side of a row of recycled material bins; the cold material dust suction device further comprises a recycled material dust suction device. The recycled material dust suction device comprises a second dust suction main pipe, a plurality of third dust suction hood bodies and a plurality of second dust suction branch pipes. The air outlet end of the second dust suction main pipe is connected to the side wall of the air outlet end of the first dust suction main pipe through a third electric air valve. The second dust suction main pipe passes through the recycled material enclosure device and is fixed on the third support frame. A plurality of fourth dust suction joints and a plurality of fifth dust suction joints are arranged on the side wall of the second dust suction main pipe. The fourth dust suction joint is connected to the air outlet end of the corresponding third dust suction hood body through a third pneumatic butterfly valve. The third dust suction hood body is located above the rear of the corresponding recycled material bin, and the air inlet end of the third dust suction hood body faces above the feed inlet of the corresponding recycled material bin. The fifth dust suction joint is connected to the air outlet end of the corresponding second dust suction branch pipe. The air inlet end of the second dust suction branch pipe is located beside the discharge outlet of the recycled material bin, and a second manual butterfly valve is arranged at the air inlet end of the second dust suction branch pipe.

[0011] Preferably, the lane enclosing device includes a fourth support frame and multiple fourth sealing plates installed on the fourth support frame. The fourth support frame is arranged at the bottom passage position of the mixing plant. The fourth sealing plates surround the left side, right side, and top side of the bottom passage of the mixing plant to form a lane. Two sets of photoelectric induction rolling doors are installed on the fourth support frame at both ends of the lane respectively. The discharging and dust suction device includes a third dust suction main pipe, multiple finished product discharging dust suction branch pipes, and multiple waste product discharging dust suction branch pipes. The air outlet end of the third dust suction main pipe is connected to the air inlet end of the powder-coated oil device through a fourth electric air valve. The third dust suction main pipe passes through the lane enclosing device and is fixed on the fourth support frame. Multiple sixth dust suction joints and multiple seventh dust suction joints are arranged on both side walls of the air inlet end of the third dust suction main pipe. The finished product discharging dust suction branch pipes are connected to the sixth dust suction joints through fourth pneumatic butterfly valves. The finished product discharging dust suction branch pipes are located beside the discharging openings of the finished product bins. Multiple first dust suction openings are opened on the bottom side wall of the finished product discharging dust suction branch pipes. The waste product discharging dust suction branch pipes are connected to the seventh dust suction joints through fifth pneumatic butterfly valves. The waste product discharging dust suction branch pipes are located beside the discharging openings of the waste product bins. Multiple second dust suction openings are opened on the bottom side wall of the waste product discharging dust suction branch pipes. Multiple third dust suction openings located in the lane are opened on the bottom side wall of the third dust suction main pipe.

[0012] Preferably, a bifurcated pipe is arranged on the side wall of the third dust suction main pipe. The air outlet end of the bifurcated pipe is sequentially connected to the burner air inlet of the raw material drying drum through a fifth electric air valve and a flue gas conveying pipe.

[0013] Preferably, the powder-coated oil device includes a fourth dust suction main pipe, a powder spraying pipe, a blower, and a powder spraying tank. An eddy current pipe section is arranged on the fourth dust suction main pipe. A feed branch pipe located on the feed side of the eddy current pipe section is arranged on the side wall of the fourth dust suction main pipe. The discharging direction of the feed branch pipe is parallel to the air outlet direction of the fourth dust suction main pipe. The bottom discharging opening of the powder spraying tank is respectively connected to the powder inlet of the powder spraying pipe and the air outlet of the blower through a first impeller feeder. The discharging opening of the powder spraying pipe is connected to the side wall of the fourth dust suction main pipe. The discharging opening direction of the powder spraying pipe is parallel to the air outlet direction of the fourth dust suction main pipe. The top feeding opening of the powder spraying tank is sequentially connected to the first discharging opening on the side of the recycled powder storage tank through a second impeller feeder and a third manual butterfly valve. The second discharging opening on the side of the recycled powder storage tank is sequentially connected to the feed end of the recycled powder humidifying device through a fourth manual butterfly valve, a third impeller feeder, and a second screw conveyor.

[0014] Preferably, the recycled powder humidifying device includes a fourth impeller feeder and a double-shaft waste powder humidifier. The discharging opening of the first bag filter is connected to the feeding opening of the fourth impeller feeder. The discharging opening of the fourth impeller feeder is connected to the feeding opening of the double-shaft waste powder humidifier.

[0015] Preferably, it further includes an asphalt scale flue gas collection device and an oil unloading tank flue gas collection device. The asphalt scale flue gas collection device includes a first flue gas collection pipe and a first flue gas collection hood. The intake end of the first flue gas collection pipe is connected to the outlet end of the first flue gas collection hood through a sixth pneumatic butterfly valve. The first flue gas collection hood is located above the asphalt scale, and the intake end of the first flue gas collection hood faces the asphalt scale. The oil unloading tank flue gas collection device includes a second flue gas collection pipe and a second flue gas collection hood. The intake end of the second flue gas collection pipe is connected to the outlet end of the second flue gas collection hood through a seventh pneumatic butterfly valve. The second flue gas collection hood is located above the oil unloading tank, and the intake end of the second flue gas collection hood faces the oil unloading tank. The outlet ends of the first flue gas collection pipe and the second flue gas collection pipe are connected in parallel and then connected to the intake end of the powder-coated oil dust removal device through a sixth electric air damper.

[0016] Preferably, it further includes a flue gas condensation and reflux device. The flue gas condensation and reflux device includes a plurality of condensers, which are respectively installed at the exhaust ports of the asphalt tank and the heavy oil tank.

[0017] To solve the above technical problems, another technical solution adopted by the present invention is: an asphalt mixture mixing dust removal process, using the above asphalt mixture mixing dust removal system. During batching, the control device controls the batching dust collection device to collect the dust generated during batching into the powder-coated oil dust removal device. The gas containing dust is subjected to dust removal treatment by the powder-coated oil dust removal device to obtain clean gas and recovered powder. The clean gas is discharged, and the recovered powder is transported to the recovered powder humidifying device. The recovered powder humidifying device humidifies the recovered powder into wet ash, and the wet ash can be transported away. During unloading and discharging, the control device controls the unloading and discharging soot collection device to collect the flue gas and dust generated during unloading and discharging into the powder-coated oil dust removal device. The gas containing flue gas and dust is successively subjected to powder coating treatment and dust removal treatment by the powder-coated oil dust removal device to obtain clean gas and recovered powder. The clean gas is discharged, and the recovered powder is transported to the recovered powder humidifying device. The recovered powder humidifying device humidifies the recovered powder into wet ash, and the wet ash can be transported away.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The cold material enclosure device and the lane enclosure device prevent the escape of dust and flue gas, which is conducive to the concentration of dust and flue gas, and also reduces the noise of equipment operation; The cold material dust suction device and the discharge dust suction device collect dust and flue gas into the powder-coated oil dust removal device in an organized manner, with high collection efficiency; The powder-coated oil device uses recycled powder to wrap and treat the flue gas, preventing the flue gas from adhering to the side wall of the pipeline and inside the first bag filter, and realizing the effective treatment of the flue gas; The first bag filter effectively filters the solid particulate dust after powder coating with oil, discharges clean air and recovers the powder material respectively, avoiding air pollution by waste gas; After the recycled powder humidifying device humidifies the recycled powder material, wet mud is discharged, and the wet mud pollutes the air and is convenient for further treatment; The whole system is reasonably designed, the process is simple and ingenious, the collection of dust and flue gas is highly organized, the efficiency of dust removal and flue gas removal is high, the treatment effect is good, and the purpose of green environmental protection is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a principle block diagram of an embodiment of the present invention.

[0020] Figure 2 It is a schematic structural diagram of the batching dust collection device of an embodiment of the present invention.

[0021] Figure 3 It is a schematic structural diagram of the discharge dust collection device of an embodiment of the present invention.

[0022] Figure 4 It is a top view schematic diagram of the discharge dust suction device of an embodiment of the present invention.

[0023] Figure 5 It is a three-dimensional schematic diagram of the discharge dust suction device of an embodiment of the present invention.

[0024] Figure 6 It is a top view schematic diagram of the powder-coated oil dust removal device and the recycled powder humidifying device of an embodiment of the present invention.

[0025] Figure 7 It is a three-dimensional schematic diagram of the powder-coated oil dust removal device and the recycled powder humidifying device of an embodiment of the present invention.

[0026] Figure 8 It is a schematic structural diagram of the asphalt scale flue gas collection device, the oil unloading tank flue gas collection device and the flue gas condensation and reflux device of an embodiment of the present invention.

[0027] Reference numerals: 11, primary aggregate bin; 12, recycled material bin; 13, primary aggregate cold vibration screen; 14, primary material drying drum; 15, recycled material drying drum; 20, mixing plant; 21, finished product bin; 22, waste bin; 31, asphalt tank; 32, asphalt scale; 33, heavy oil tank; 34, oil unloading pit; 100, batching dust collection device; 110, cold material enclosure device; 120, cold material dust suction device; 130, primary aggregate enclosure device; 131, first support frame; 132, first sealing plate; 133, second support frame; 134, second sealing plate; 140, primary aggregate dust suction device; 141, first dust suction main pipe; 1411, first dust suction joint; 1412, second dust suction joint; 1413, third dust suction joint; 142, first dust suction hood; 143, first dust suction branch pipe; 144, first electric air damper; 145, first pneumatic butterfly valve; 146, first manual butterfly valve; 147, second dust suction hood; 148, second electric air damper; 150, recycled material enclosure device; 151, third support frame; 152, third sealing plate; 160, recycled material dust suction device; 161, second dust suction main pipe; 1611, fourth dust suction joint; 1612, fifth dust suction joint; 162, third dust suction hood; 163, second dust suction branch pipe; 164, third electric air damper; 165, third pneumatic butterfly valve; 166, second manual butterfly valve; 200, discharge and feeding dust collection device; 210, lane enclosure device; 211, fourth support frame; 212, fourth sealing plate; 213, photoelectric induction rolling shutter door; 220, discharge and feeding dust suction device; 221, third dust suction main pipe; 2211, sixth dust suction joint; 2212, seventh dust suction joint; 2213, bifurcated pipe; 2214, third dust suction port; 222, finished product discharge dust suction branch pipe; 2221, first dust suction port; 223, waste discharge dust suction branch pipe; 2231, second dust suction port; 224, fourth electric air damper; 225, fourth pneumatic butterfly valve; 226, fifth pneumatic butterfly valve; 227, fifth electric air damper; 300, powder-coated oil dust removal device; 310, powder-coated oil device; 311, fourth dust suction main pipe; 3111, eddy current pipe section; 3112, feeding branch pipe; 312, powder spraying pipe; 313, blower; 314, powder spraying tank; 315, first impeller feeder; 320, first bag filter; 321, induced draft fan; 322, chimney; 330, recycled powder storage tank; 331, third manual butterfly valve; 332, second impeller feeder; 333, fourth manual butterfly valve; 334, third impeller feeder; 335, second screw conveyor; 340, first screw conveyor; 400, recycled powder humidifying device; 410, fourth impeller feeder; 420, double-shaft waste powder humidifier; 500, asphalt scale flue gas collection device; 510, first flue gas collection pipe; 520, first flue gas collection hood; 530, sixth pneumatic butterfly valve; 540, sixth electric air damper; 600, oil unloading pit flue gas collection device; 610, second flue gas collection pipe620. Second flue gas collection hood; 630. Seventh pneumatic butterfly valve; 700. Flue gas condensation and reflux device; Detailed implementation manners

[0028] In order to make the above features and advantages of the present invention more obvious and understandable, specific embodiments are hereinafter given and described in detail in conjunction with the accompanying drawings.

[0029] Please refer to Figure 1 , an asphalt mixture mixing and dust removal system, including a batching dust collection device 100, a discharging and feeding dust collection device 200, a powder-coated oil dust removal device 300 and a recycled powder humidifying device 400. The batching dust collection device 100 is composed of a cold material enclosing device 110 and a cold material dust suction device 120. The cold material enclosing device 110 is arranged outside the batching system (generally including cold material bins and conveyor belts), and the air inlet end of the cold material dust suction device 120 penetrates through the cold material enclosing device 110; the discharging and feeding dust collection device 200 is composed of a lane enclosing device 210 and a discharging and feeding dust suction device 220. The lane enclosing device 210 is arranged at the bottom passage position of the mixing plant 20, and the air inlet end of the discharging and feeding dust suction device 220 penetrates through the lane enclosing device 210; the powder-coated oil dust removal device 300 is composed of a powder-coated oil device 310 and a first bag filter 320. The air outlet end of the cold material dust suction device 120 is connected to the air inlet end of the powder-coated oil device 310, the air outlet end of the discharging and feeding dust suction device 220 is connected to the air inlet end of the powder-coated oil device 310, the air outlet end of the powder-coated oil device 310 is connected to the air inlet end of the first bag filter 320, and the discharging end of the first bag filter 320 can be connected to the feeding end of the recycled powder humidifying device 400 through a first screw conveyor 340. The batching dust collection device 100, the discharging and feeding dust collection device 200, the powder-coated oil dust removal device 300 and the recycled powder humidifying device 400 are all electrically connected to a control device. Among them, the control device is preferably but not limited to Siemens PLC, such as S7-300, S7-400, etc.; the first bag filter 320 is preferably but not limited to a BDM-360 pulse jet bag filter.

[0030] In this embodiment, please refer to Figure 1 and Figure 2, the cold material enclosing device 110 includes a primary aggregate enclosing device 130. The primary aggregate enclosing device 130 includes a first support frame 131 and a plurality of first sealing plates 132 fixed on the first support frame 131. The first support frame 131 is arranged around a row of primary aggregate bins 11, and the first sealing plates 132 surround the left side, right side, rear side, and top side of a row of primary aggregate bins 11; the cold material dust suction device 120 includes a primary aggregate dust suction device 140. The primary aggregate dust suction device 140 includes a first dust suction main pipe 141, a plurality of first dust suction hoods 142, and a plurality of first dust suction branch pipes 143. The air outlet end of the first dust suction main pipe 141 is connected to the air inlet end of the powder-coated oil device 310 through a first electric air damper 144. The first dust suction main pipe 141 passes through the primary aggregate enclosing device 130 and is fixed on the first support frame 131. A plurality of first dust suction connectors 1411 and a plurality of second dust suction connectors 1412 are arranged on the side wall of the first dust suction main pipe 141. The first dust suction connector 1411 is connected to the air outlet end of the corresponding first dust suction hood 142 through a first pneumatic butterfly valve 145. The first dust suction hood 142 is located above the rear of the corresponding primary aggregate bin 11, and the air inlet end of the first dust suction hood 142 faces above the feed inlet of the corresponding primary aggregate bin 11. The second dust suction connector 1412 is connected to the air outlet end of the corresponding first dust suction branch pipe 143. The air inlet end of the first dust suction branch pipe 143 is located beside the discharge outlet of the primary aggregate bin 11, and a first manual butterfly valve 146 is arranged at the air inlet end of the first dust suction branch pipe 143.

[0031] In this embodiment, please refer to Figure 1 and Figure 2 , the primary aggregate enclosing device 130 further includes a second support frame 133 and a plurality of second sealing plates 134 fixed on the second support frame 133. The second support frame 133 is arranged around the primary aggregate inclined conveyor belt and the primary aggregate cold vibration screen 13, and the second sealing plates 134 surround the primary aggregate inclined conveyor belt and the primary aggregate cold vibration screen 13; the primary aggregate dust suction device 140 further includes a second dust suction hood 147. A third dust suction connector 1413 is arranged on the side wall of the first dust suction main pipe 141. The third dust suction connector 1413 is connected to the air outlet end of the second dust suction hood 147 through a second electric air damper 148. The air inlet end of the second dust suction hood 147 is located directly above the primary aggregate cold vibration screen 13.

[0032] In this embodiment, please refer to Figure 1 and Figure 2, the cold material enclosure device 110 further includes a recycled material enclosure device 150. The recycled material enclosure device 150 includes a third support frame 151 and a plurality of third sealing plates 152 fixed on the third support frame 151. The third support frame 151 is arranged around a row of recycled material bins 12, and the third sealing plates 152 surround the left side, right side, rear side and top side of a row of recycled material bins 12; the cold material dust suction device 120 further includes a recycled material dust suction device 160. The recycled material dust suction device 160 includes a second dust suction main pipe 161, a plurality of third dust suction hoods 162 and a plurality of second dust suction branch pipes 163. The air outlet end of the second dust suction main pipe 161 is connected to the side wall of the air outlet end of the first dust suction main pipe 141 through a third electric air valve 164. The second dust suction main pipe 161 passes through the recycled material enclosure device 150 and is fixed on the third support frame 151. A plurality of fourth dust suction connectors 1611 and a plurality of fifth dust suction connectors 1612 are arranged on the side wall of the second dust suction main pipe 161. The fourth dust suction connectors 1611 are connected to the air outlet ends of the corresponding third dust suction hoods 162 through third pneumatic butterfly valves 165. The third dust suction hoods 162 are located above the rear of the corresponding recycled material bins 12, and the air inlet ends of the third dust suction hoods 162 face above the feed inlets of the corresponding recycled material bins 12. The fifth dust suction connectors 1612 are connected to the air outlet ends of the corresponding second dust suction branch pipes 163. The air inlet ends of the second dust suction branch pipes 163 are located beside the discharge outlets of the recycled material bins 12, and second manual butterfly valves 166 are arranged at the air inlet ends of the second dust suction branch pipes 163.

[0033] In this embodiment, in order to further reduce dust diffusion, dust-proof soft curtains can be installed on both the first support frame 131 and the third support frame 151 at the front sides of the corresponding cold material bins to prevent dust from escaping when the forklift is loading materials. In order to facilitate the control of the operation of the batching dust collection device 100, the batching system (i.e., each cold material bin, including the virgin material bin and the recycled material bin) is provided with sensors for sensing the approach of the small forklift to the corresponding cold material bin. The sensors are electrically connected to the control device. The sensors can be buried pressure sensors, infrared sensors or ultrasonic sensors, etc. When the forklift is loading materials, the sensors are triggered. After receiving the signals from the sensors, the control device controls the pneumatic butterfly valves of the corresponding cold material bins to realize the independent dust removal operation of each cold material bin.

[0034] In this embodiment, please refer to Figures 3 to 5, the lane enclosure device 210 includes a fourth support frame 211 and multiple fourth sealing plates 212 installed on the fourth support frame 211. The fourth support frame 211 is arranged at the bottom passage position of the mixing plant 20. The fourth sealing plates 212 surround the left side, right side, and top side of the bottom passage of the mixing plant 20 to form a lane. Two sets of photoinductive rolling shutter doors 213 are installed on the fourth support frame 211 at both ends of the lane. When a vehicle enters the lane, the photoinductive rolling shutter doors 213 are lowered, so that the discharge of finished materials and the discharge of waste materials are both in a closed space, preventing dust and asphalt fumes from escaping, and more effectively ensuring that dust and fumes are sucked away. The discharge and waste discharge dust suction device 220 includes a third dust suction main pipe 221, multiple finished product discharge dust suction branch pipes 222, and multiple waste discharge dust suction branch pipes 223. The air outlet end of the third dust suction main pipe 221 is connected to the air inlet end of the powder-coated oil device 310 through a fourth electric air damper 224. The third dust suction main pipe 221 passes through the lane enclosure device 210 and is fixed on the fourth support frame 211. A plurality of sixth dust suction joints 2211 and a plurality of seventh dust suction joints 2212 are arranged on both side walls of the air inlet end of the third dust suction main pipe 221. The finished product discharge dust suction branch pipe 222 is connected to the sixth dust suction joint 2211 through a fourth pneumatic butterfly valve 225. The finished product discharge dust suction branch pipe 222 is located beside the discharge port of the finished product bin 21. A plurality of first dust suction ports 2221 are opened on the bottom side wall of the finished product discharge dust suction branch pipe 222. The waste discharge dust suction branch pipe 223 is connected to the seventh dust suction joint 2212 through a fifth pneumatic butterfly valve 226. The waste discharge dust suction branch pipe 223 is located beside the discharge port of the waste bin 22. A plurality of second dust suction ports 2231 are opened on the bottom side wall of the waste discharge dust suction branch pipe 223. A plurality of third dust suction ports 2214 located in the lane are opened on the bottom side wall of the third dust suction main pipe 221. Among them, a monitoring device can be arranged in the lane enclosure device 210, and the monitoring device is electrically connected to the control device to facilitate production personnel to monitor the situation of on-site finished product discharge and waste discharge.

[0035] In this embodiment, please refer to Figures 2 to 5 , a bifurcated pipe 2213 is arranged on the side wall of the third dust suction main pipe 221. The air outlet end of the bifurcated pipe 2213 can be sequentially connected to the burner air inlet of the raw material drying drum 14 through a fifth electric air damper 227 and a flue gas conveying pipe (omitted in the figure); when only the finished product bin is discharging, the main component of the flue gas is organic matter, which can be sent into the raw material drying drum 14 for combustion assistance. Among them, the flue gas outlets of the raw material drying drum 14, the flue gas outlet of the recycled material drying drum 15, and the flue gas outlet of the stirrer (located on the mixing plant, omitted in the figure) are all connected to a second bag type dust collector (omitted in the figure), and the discharge port of the second bag type dust collector is connected to Figure 6 and Figure 7 the recycled powder storage tank 330 shown in

[0036] In this embodiment, the first support frame 131, the second support frame 133, the third support frame 151, and the fourth support frame 211 are all made of steel structure. The first sealing plate 132, the second sealing plate 134, the third sealing plate 152, and the fourth sealing plate 212 are all made of, but not limited to, color tiles. The first support frame 131 and the first sealing plate 132, and the third support frame 151 and the third sealing plate 152 respectively form three-sided enclosed structures to prevent dust diffusion during feeding and discharging. For lighting, a plurality of transparent windows can be respectively arranged on the left and right sides of the fourth support frame 211, and the transparent windows can be aluminum alloy glass windows.

[0037] In this embodiment, please refer to Figure 6 and Figure 7 , the powder coating oil device 310 includes a fourth dust suction main pipe 311, a powder spraying pipe 312, a blower 313, and a powder spraying tank 314. A vortex pipe joint 3111 is arranged on the fourth dust suction main pipe 311. A feed branch pipe 3112 is arranged on the side wall of the fourth dust suction main pipe 311 on the feed side of the vortex pipe joint 3111. The discharging direction of the feed branch pipe 3112 is parallel to the air outlet direction of the fourth dust suction main pipe 311. The bottom discharge port of the powder spraying tank 314 is respectively connected to the powder inlet of the powder spraying pipe 312 and the air outlet of the blower 313 through a first impeller feeder 315. The discharge port of the powder spraying pipe 312 is connected to the side wall of the fourth dust suction main pipe 311, and the discharging direction of the discharge port of the powder spraying pipe 312 is parallel to the air outlet direction of the air outlet of the fourth dust suction main pipe 311. The top feed port of the powder spraying tank 314 is sequentially connected to the first discharge port on the side of the recycled powder storage tank 330 through a second impeller feeder 332 and a third manual butterfly valve 331. The second discharge port on the side of the recycled powder storage tank 330 is sequentially connected to the feed end of the recycled powder humidifying device 400 through a fourth manual butterfly valve 333, a third impeller feeder 334, and a second screw conveyor 335. Among them, the diameter of the vortex pipe joint 3111 is larger than the diameter of the fourth dust suction main pipe 311. Due to the increase in diameter, and the recycled powder used for powder coating oil is tangentially sprayed into the fourth dust suction main pipe 311, the sprayed recycled powder and the flue gas form a vortex in the vortex pipe joint 3111, so that the two are fully mixed, and the recycled powder wraps liquid substances such as oil in the flue gas to form solid substances.

[0038] In this embodiment, please refer to Figure 6 and Figure 7 , the recycled powder humidifying device 400 includes a fourth impeller feeder 410 and a double-shaft waste powder humidifier 420 (also called a double-shaft dust humidifier). The discharge port of the first bag filter 320 is connected to the feed port of the fourth impeller feeder 410, and the discharge port of the fourth impeller feeder 410 is connected to the feed port of the double-shaft waste powder humidifier 420.

[0039] In this embodiment, please refer to Figure 8 , the asphalt mixture mixing dust removal system may further include an asphalt scale flue gas collection device 500 and an oil unloading tank flue gas collection device 600. The asphalt scale flue gas collection device 500 includes a first flue gas collection pipe 510 and a first flue gas collection hood 520. The intake end of the first flue gas collection pipe 510 is connected to the outlet end of the first flue gas collection hood 520 through a sixth pneumatic butterfly valve 530. The first flue gas collection hood 520 is located above the asphalt scale 32, and the intake end of the first flue gas collection hood 520 faces the asphalt scale 32. The oil unloading tank flue gas collection device 600 includes a second flue gas collection pipe 610 and a second flue gas collection hood 620. The intake end of the second flue gas collection pipe 610 is connected to the outlet end of the second flue gas collection hood 620 through a seventh pneumatic butterfly valve 630. The second flue gas collection hood 620 is located above the oil unloading tank 34, and the intake end of the second flue gas collection hood 620 faces the oil unloading tank 34. The outlet ends of the first flue gas collection pipe 510 and the second flue gas collection pipe 610 are connected in parallel and then connected to the intake end of the powder-coated oil dust removal device 300 through a sixth electric air damper 540.

[0040] In this embodiment, please refer to Figure 8 , the asphalt mixture mixing dust removal system may further include a flue gas condensation and reflux device 700. The flue gas condensation and reflux device 700 includes a plurality of condensers, which are respectively installed at the exhaust ports of the asphalt tank 31 and the heavy oil tank 33. By respectively collecting, condensing and refluxing the flue gas generated by the asphalt tank 31 and the heavy oil tank 33, environmental pollution caused by the flue gas is avoided.

[0041] In this embodiment, a multi-way pipe such as a tee pipe or a cross pipe may be provided at the intake end of the powder-coated oil device 310 to facilitate connection to the outlet end of the batching dust collection device 100, the outlet end of the unloading and discharging dust collection device 200, etc. The batching dust collection device 100 and the unloading and discharging dust collection device 200 operate under the negative pressure of the induced draft fan 321 of the first bag type dust collector 320. The clean gas filtered by the first bag type dust collector 320 can be directly discharged into the atmosphere through the chimney 322.

[0042] Please refer to Figures 1 to 8, an asphalt mixture mixing and dust removal process, using the above-mentioned asphalt mixture mixing and dust removal system. During batching, the control device controls the batching dust collection device 100 to collect the dust generated during batching into the powder-coated oil dust removal device 300. The gas containing dust is dust-removed by the powder-coated oil dust removal device 300 to obtain clean gas and recycled powder. The clean gas is discharged, and the recycled powder can be conveyed to the recycled powder humidifying device 400 through the first screw conveyor 340. The recycled powder humidifying device 400 humidifies the recycled powder into wet ash, and then the wet ash can be transported away. During discharging, the control device controls the discharging dust and smoke collection device 200 to collect the smoke and dust generated during discharging into the powder-coated oil dust removal device 300. The gas containing smoke and dust is successively subjected to powder-coated oil treatment and dust removal treatment by the powder-coated oil dust removal device 300 to obtain clean gas and recycled powder. The clean gas is discharged, and the recycled powder can be conveyed to the recycled powder humidifying device 400 through the first screw conveyor 340. The recycled powder humidifying device 400 humidifies the recycled powder into wet ash, and then the wet ash can be transported away.

[0043] As mentioned above, the above is only the preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any person skilled in the art who has not departed from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention shall fall within the scope of the present invention.

Claims

1. An asphalt mixture mixing and dust removal system, characterized in that: It includes a powder-coated oil dust removal device, which is composed of a powder-coated oil device and a first bag filter. The air inlet end of the powder-coated oil device is used to receive the dust generated by batching. The air outlet end of the powder-coated oil device is connected to the air inlet end of the first bag filter. The powder-coated oil device includes a fourth dust suction main pipe, a powder spraying pipe, a blower, and a powder spraying tank. A vortex pipe section is provided on the fourth dust suction main pipe. A feed branch pipe located on the feed side of the vortex pipe section is provided on the side wall of the fourth dust suction main pipe. The discharge direction of the feed branch pipe is parallel to the air outlet direction of the fourth dust suction main pipe. The bottom discharge port of the powder spraying tank is respectively connected to the powder inlet of the powder spraying pipe and the air outlet of the blower through a first impeller feeder. The discharge port of the powder spraying pipe is connected to the side wall of the fourth dust suction main pipe. The discharge port direction of the powder spraying pipe is parallel to the air outlet direction of the fourth dust suction main pipe.

2. The asphalt mixture mixing and dust removal system according to claim 1, characterized in that: The top feed port of the powder spraying tank is sequentially connected to the first discharge port on the side of the recycled powder storage tank through a second impeller feeder and a third manual butterfly valve.

3. The asphalt mixture stirring and dust removal system according to claim 1, wherein: It also includes a batching dust collection device, which is composed of a cold material enclosure device and a cold material dust suction device. The cold material enclosure device is arranged outside the batching system. The air inlet end of the cold material dust suction device penetrates into the cold material enclosure device. The air outlet end of the cold material dust suction device is connected to the air inlet end of the powder-coated oil device.

4. The asphalt mixture mixing and dust removal system according to claim 1, wherein: It also includes a discharge dust collection device, which is composed of a lane enclosure device and a discharge dust suction device. The lane enclosure device is arranged at the bottom passage position of the mixing plant. The air inlet end of the discharge dust suction device penetrates into the lane enclosure device. The air outlet end of the discharge dust suction device is connected to the air inlet end of the powder-coated oil device.

5. The asphalt mixture mixing and dust removal system according to claim 1, characterized in that: It also includes an asphalt scale flue gas collection device and an oil unloading tank flue gas collection device. The air outlet ends of the asphalt scale flue gas collection device and the oil unloading tank flue gas collection device are connected to the air inlet end of the powder-coated oil dust removal device.

6. A dust removal process for asphalt mixture mixing, characterized in that: Using the asphalt mixture mixing dust removal system according to any one of claims 1 to 5, during batching, the dust generated by batching is collected into the powder-coated oil dust removal device. The gas containing dust is subjected to dust removal treatment by the powder-coated oil dust removal device to obtain clean gas and recycled powder, and the clean gas is discharged.

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