Intelligent environment-friendly asphalt mixing plant

Abstract

The invention relates to an intelligent environment-friendly asphalt mixing plant, which comprises: a main tower, which is provided with a metering layer, a mixing cylinder, a trolley layer and a discharge port; the mechanical overflow bin is arranged on the front side of the main tower; the aggregate storage bin is arranged on one side of the main tower and supplies aggregate to the main tower; the dust recycling system is connected to the metering layer, the stirring cylinder, the mechanical overflow bin, the aggregate bin and the discharging opening and used for recycling dust; and the flue gas recycling system is connected to the trolley layer and the discharging opening and used for recycling flue gas. According to the asphalt mixing plant, all production and matched auxiliary units in a factory area can be connected into a whole in parallel, intelligent and automatic production is achieved, dust and smoke are prevented in all directions, the environmental protection degree is improved, and the asphalt mixing plant belongs to the technical field of asphalt mixing equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt mixing equipment, and in particular to an intelligent and environmentally friendly asphalt mixing station. Background Art

[0002] At present, asphalt mixing plants belong to the "double high" industry, that is, high pollution and high energy consumption. In terms of environmental protection, a large amount of dust and asphalt fume pollution will be generated during the production of asphalt mixtures; in terms of energy saving, in addition to the high energy consumption of the mixing plant equipment itself, most plants and stations currently lack high-level production personnel and automated information management, and the technical level of equipment is uneven, and there is a large amount of resource waste in some process flows. In addition, there are high-temperature asphalt tank areas, fuel oil areas, boiler special equipment areas or natural gas equipment areas in the asphalt production process equipment, which generally lack perfect management methods and management technical means, and there are obvious safety hazards. Summary of the invention

[0003] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide an intelligent and environmentally friendly asphalt mixing station, which solves the problem that a large amount of dust and asphalt fume pollution will be generated in the asphalt mixing station during the production process of asphalt mixture, and realizes intelligent comprehensive management and control of the plant area.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] An intelligent and environmentally friendly asphalt mixing station, comprising:

[0006] The main tower has a metering layer, a mixing tank, a trolley layer and a discharge port;

[0007] Mechanical overflow bin, which is set at the front side of the main tower;

[0008] Aggregate silo: The aggregate silo is set on one side of the main tower, and the aggregate silo supplies aggregates to the main tower;

[0009] Dust recovery system: The dust recovery system is connected to the metering layer, mixing tank, mechanical overflow bin, aggregate bin and discharge port to recover dust;

[0010] The smoke recovery system is respectively connected to the trolley layer and the discharge port to recover the smoke.

[0011] As a preferred embodiment, the dust recovery system includes a first dust removal module and a second dust removal module, the first dust removal module is respectively arranged at the metering layer and the mixing tank, and the second dust removal module is respectively arranged at the mechanical overflow bin, the discharge port and the conveying tunnel at the bottom of the aggregate bin.

[0012] As a preferred embodiment, the first dust removal module includes a first dust collector, a first induced air duct, a second induced air duct and a dust collecting air duct, the first induced air duct and the second induced air duct are respectively connected to the metering layer and the mixing cylinder; the first induced air duct and the second induced air duct are both connected to the dust collecting air duct, and the dust collecting air duct is connected to the first dust collector.

[0013] As a preferred embodiment, the second dust removal module includes a second dust collector, a third induced air duct, a suction duct, a branch air duct and a second dust hood, the two ends of the third induced air duct are respectively connected to the second dust collector and the dust-smoke duct branch joint, the dust-smoke duct branch joint is connected to the mechanical overflow bin, the dust-smoke duct branch joint is also connected to the first dust hood, and the first dust hood is arranged at the unloading port; one end of the second dust collector is connected to the suction duct, the suction duct is connected to the second dust hood through the branch air duct, and the second dust hood is located above the discharge port of the sunken hopper belt conveyor of the aggregate bin.

[0014] As a preferred embodiment, the flue gas recovery system includes a flue gas purification device, a first flue gas duct and a second flue gas duct, wherein both ends of the first flue gas duct are respectively connected to the trolley layer and the dust suction-smoke duct branch joint; the second flue gas duct is respectively connected to the discharge port and the flue gas purification device through the dust suction-smoke duct branch joint at both ends.

[0015] As a preferred embodiment, it also includes a fuel supply system, a high-position drying drum and a low-position drying drum. The high-position drying drum is used to dry asphalt recycled materials, and the low-position drying drum is used to dry aggregates transported from the aggregate bin to the main tower. The fuel supply system includes a fuel tank, a first oil pump, a second oil pump, a relay tank, a low-position oil supply pipe, a high-position oil supply pipe, a low-position oil return pipe, a high-position oil return pipe and an oil return pipe. The first oil pump is connected to the fuel tank through a pipeline, the relay tank is connected to the first oil pump through a pipeline, the second oil pump is connected to the relay tank through a pipeline, and the second oil pump is connected to the low-position oil supply pipe and the high-position oil supply pipe respectively; the low-position drying drum and the high-position drying drum are respectively provided with a low-position burner and a high-position burner, and the low-position oil supply pipe and the high-position oil supply pipe are respectively connected to the low-position burner and the high-position burner; the low-position oil return pipe and the high-position oil return pipe are respectively connected to the low-position burner and the high-position burner, and the low-position oil return pipe and the high-position oil return pipe are both connected to the oil return pipe, and the oil return pipe is connected to the fuel tank.

[0016] As a preferred embodiment, it also includes: a boiler device, the boiler device is used to heat the heat transfer oil; an asphalt tank area, the asphalt tank area is connected to the boiler device for heating asphalt, and the asphalt tank area is connected to the main tower for supplying asphalt to the main tower for mixing with aggregates.

[0017] As a preferred embodiment, the asphalt tank area includes an asphalt tank, an asphalt pump and an asphalt unloading pool. There are three asphalt pumps, two of which are connected to the inlet of the asphalt tank and to the asphalt unloading pool; the remaining asphalt pumps are connected to the outlet of the asphalt tank, serving as a matrix asphalt supply interface for connecting the asphalt tank to an expanded asphalt tank or to a rubber asphalt equipment; the asphalt tank is also connected to a pipeline interface for supplying an asphalt spreader; the boiler equipment heats the heat transfer oil to circulate the heat transfer oil for heating the asphalt in the asphalt tank.

[0018] As a preferred embodiment, the boiler equipment includes an oil tank, a natural gas supply source, a boiler burner, a circulating pump, a circulating heat oil return pipe, a boiler high-level oil tank and a heat oil circulation pipeline. The oil tank and the natural gas supply source are both connected to the boiler burner, the circulating pump is connected to the heat oil circulation pipeline, the heat oil circulation pipeline is wrapped around the asphalt tank, the boiler burner heats the heat oil circulation pipeline, the boiler high-level oil tank is connected to the circulating heat oil return pipe, and the connection point is located in front of the circulating pump.

[0019] As a preferred embodiment, it further comprises a control system, wherein the control system comprises a controller;

[0020] The first air induced duct and the second air induced duct are both provided with a first electrically controlled gate valve, and the controller controls the first air induced duct and the second air induced duct to be connected or closed by controlling the first electrically controlled gate valve;

[0021] The air suction pipe, the branch air pipe and the discharge port of the second dust collector are all provided with pneumatic flap doors. The controller controls the on-off of the airflow in the air suction pipe and the branch air pipe by controlling the pneumatic flap doors. The controller controls the on-off of the discharge port of the second dust collector by controlling the pneumatic flap doors.

[0022] The mixing cylinder and the drying drum are both provided with negative pressure sensors, and the controller receives signals from the negative pressure sensors;

[0023] The heat transfer oil inlet of the asphalt tank is equipped with an electric gate valve, and the heat transfer oil outlet of the asphalt tank is equipped with a manual gate valve. The electric gate valve is electrically connected to the controller for remote control of on and off;

[0024] The inlet and outlet of the asphalt tank are both equipped with pneumatic butterfly valves, which are connected to the controller to remotely control the opening and closing of the inlet and outlet of the asphalt tank;

[0025] A pressure level sensor and a first temperature sensor are provided in the asphalt tank, and both the pressure level sensor and the temperature sensor are electrically connected to the controller;

[0026] A flame sensor is provided in the boiler burner, and the flame sensor is connected to the controller;

[0027] The inlet and outlet of the boiler burner are provided with a pressure sensor and a second temperature sensor, and the pressure sensor and the second temperature sensor are both electrically connected to the controller;

[0028] The circulation pump is equipped with an alarm, which is electrically connected to the controller.

[0029] In general, the present invention has the following advantages:

[0030] 1. The asphalt mixing station of the present invention realizes all-round dust and smoke prevention and improves the degree of environmental protection by setting up a comprehensive dust and smoke prevention structure for the main dust and smoke generating parts in the production process. The main tower connection is provided with an encapsulation to enhance the sealing effect. The metering layer and the mixing cylinder of the main tower are provided with an air duct, and the negative pressure is controlled by the first dust collector to reduce the discharge of dust and smoke. The trolley layer and the discharge port with more dust and smoke are installed with a dust hood, the corresponding dust and smoke duct and the smoke duct, and finally connected to the second dust collector and the smoke purification equipment respectively; the overflow of the main tower of the asphalt mixing station is provided with a mechanical overflow bin for storing the overflow discharged during the production process. The entire link is in a closed space, there is no dust discharge, and the space occupied by the material is saved. On the other hand, the present invention can reduce the fluctuation of the pressure in the metering bucket caused by the impact of the stone by maintaining the negative pressure of the metering layer and the mixing cylinder, improve the metering accuracy, make the actual production ratio more accurate, and ensure the quality of the finished product.

[0031] 2. During the production process of the asphalt mixing plant of the present invention, in the process of transporting aggregates in the existing aggregate silo (ground-sunken aggregate silo), dust generated by the transportation, dropping and throwing of aggregates in the tunnel can be collected into the second dust collector through the dust hood and the air duct; the second dust collector can drop the collected dust onto the belt for transporting aggregates. The air suction duct and the second dust hood are arranged in the tunnel of the ground-sunken silo, and dust is removed by the second dust collector, which can greatly reduce the dust in the tunnel below during the production process, facilitate emergency shutdown and maintenance to enter the tunnel when problems such as conveyor belt failure occur, and avoid environmental problems caused by dust accumulation on the ground of the tunnel that is inconvenient to handle. In addition, the collected dust is also raw material stone powder that can be used for production. It can be directly put into the conveyor belt for production through the discharge port of the second dust collector, which saves resources to a certain extent.

[0032] 3. The asphalt mixing station of the present invention has effectively improved the currently widely used single pump fuel system, and adopted the automatic control mode of constant pressure fuel supply to ensure the delivery power and increase the service life of the pump group. The two sets of pump groups of the fuel supply system are connected to the controller, and the fuel tank is pumped to the relay tank through the first oil pump, and then pumped to the low-level burner and the high-level burner through the second oil pump respectively, which is used for ignition of the dry drum burner to heat the aggregate (low-level dry drum) / asphalt recycled material (high-level dry drum) in the drum. Since the fuel tank is generally stored in the oil depot area and is relatively far away from the dry drum, a single pump is generally used to deliver fuel. However, with the change of production temperature, the fuel supply (oil pressure) of the burner of the dry drum will change, and the pumping pressure should change accordingly, while the power of the single pump delivery pump at both ends remains unchanged. Especially when the required fuel pressure decreases, the power of the side of the single pump connected to the oil tank cannot float down too much to ensure the stability of the long-distance delivery oil pressure, and the pumping pressure demand on the side connected to the burner decreases, resulting in low frequency conversion regulation efficiency and insufficient stability of the pump group. Through the relay tank and double pump delivery, the first oil pump always maintains the pumping pressure required for long-distance delivery, and the burner demand oil pressure and the pumping pressure of the second oil pump group are controlled by frequency conversion to maintain a dynamic stable state. The frequency conversion feedback negative pressure sensor and overflow valve configured in the relay tank ensure the safety and real-time adjustment of the tank oil pressure during long-term delivery, making the production process fuel supply system efficient, safe and stable, and extending the life of the oil pump. In addition, the oil tank also has a liquid level display, the overflow valve is connected to the oil return main pipe, and the high-position oil supply pipe is equipped with a check valve to ensure the convenience of repairing the pump group; each pump group cooperates with the corresponding electrical components, and can be automated and remotely controlled through the master control system.

[0033] 4. The asphalt mixing station of the present invention connects the asphalt tank area and the boiler equipment area to the controller, realizes the automation and information management of the whole process of various actions in the asphalt tank area, provides the operation mode of the boiler equipment under automatic operation, and connects the outlet overtemperature, smoke exhaust overtemperature, outlet low pressure, low flow, liquid level, and combustion failures that mainly occur in the operation of the boiler equipment to the system for remote operation and monitoring through various sensors, and cooperates with the monitoring facilities set up in the boiler room for the furnace body, pump group, safety valve, chimney and other positions, which is effective and reliable, real-time monitoring, and fast feedback speed, and can realize the automation control of the whole process of asphalt oil inlet, oil extraction, boiler equipment switch, heating, and fault screening. By setting pneumatic butterfly valves, manual gate valves, and electric gate valves to connect the asphalt unloading pool and boiler equipment respectively, the automatic control of pipeline on and off is realized. The operation cabinet of the boiler equipment is connected to the controller, and a flame sensor is installed in the boiler equipment for the flame indication of the system. In addition, inlet and outlet pressure sensors and temperature sensors are installed to monitor the pressure and temperature indication of the boiler equipment. The circulating pump is installed with an alarm for indicating abnormal operation of the circulating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1This is a schematic diagram of the main tower area of ​​an asphalt mixing plant, which shows that the first dust removal module is respectively arranged in the metering layer and the mixing tank.

[0035] Figure 2 The second dust removal module is schematically shown in the main tower area (front view) and the smoke recovery system (front view). The figure shows that the main tower area of ​​the second dust removal module is respectively set at the mechanical overflow bin and the discharge port; the smoke recovery system is set at the trolley layer and the discharge port.

[0036] Figure 3 Schematic diagram of the negative pressure sensor set in the mixing tank.

[0037] Figure 4 Schematic diagram of the negative pressure sensor being arranged on the drying drum.

[0038] Figure 5 The second dust removal module is schematically shown in the main tower area (top view) and the flue gas recovery system (top view). The second dust removal module is shown in the figure as being located at the discharge port; the flue gas recovery system is separately located at the discharge port and at the connection to the environmental protection facilities.

[0039] Figure 6 This is a top view of the aggregate silo.

[0040] Figure 7 This is a schematic diagram of the conveying tunnel of the second dust removal module at the bottom of the aggregate silo.

[0041] Figure 8 This is a partial enlarged view of the second dust removal module near the sunken hopper belt conveyor.

[0042] Fig. 9 This is a schematic diagram of the connection between the boiler equipment and the asphalt tank area.

[0043] Fig.10 Schematic diagram of the fuel supply system.

[0044] Among them, 1-main tower; 2-metering layer; 3-mixing cylinder; 4-first induced air duct; 5-second induced air duct; 6-first electric control gate valve; 7-dust collecting air duct; 8-first dust collector; 9-drying drum; 10-negative pressure sensor; 11-trolley layer; 12-overflow bin top interface; 13-mechanical overflow bin; 14-first flue gas duct; 15-first dust hood; 16-dust suction-smoke duct tap; 17-third induced air duct; 18-second dust collector; 19-second flue gas duct; 20-aggregate bin; 21-sunken hopper belt conveyor; 22-first conveyor belt; 23-aggregate; 24-suction pipe; 25-tap air duct; 26-second dust hood; 27-pneumatic flap door; 28-discharging port; 29-underground tunnel; 30-second conveyor belt; 31-pneumatic butterfly valve; 32-asphalt tank; 33-electric gate valve; 34-manual gate valve; 35-agitator; 36-first asphalt pump; 37-second asphalt pump; 38-pipeline interface; 39-asphalt unloading pool; 40-oil tank; 41-natural gas supply source; 42-boiler burner; 43-flame indication; 44-first temperature sensor; 45-circulation pump; 46-alarm; 47-boiler high-level oil tank; 48-fuel tank; 49-first oil pump; 50-overflow valve; 51-relay tank; 52-frequency feedback negative pressure sensor; 53-second oil pump; 54-low-level oil supply pipe; 55-low-level oil return pipe; 56-check valve; 57-high-level oil supply pipe; 58-high-level oil return pipe; 59-return oil main pipe; 60-low-level burner; 61-high-level burner. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below in conjunction with specific implementation methods.

[0046] The existing newly built asphalt mixing plants mainly use closed plants to cover the entire production area to prevent the leakage of pollutants, and cooperate with smoke dust purification and environmental protection facilities to treat the smoke dust in the plant. Although the prevention and control effect of leaked pollutants is obvious, the technical levels of production equipment, environmental protection facilities and production management in the plant are different, and the pollutant control effect is not good. Moreover, most of the old asphalt mixture production plants and stations cannot rebuild the plant, and it is impossible to strictly control the emission of smoke pollutants by relying solely on environmental protection facilities. In addition, in terms of production, energy consumption, and safety management, new plants and stations can rely on the plant structure to install a large number of monitors to achieve efficient and full coverage supervision effects, while most plants and stations rely on personnel in various positions for operation and management, and the overall management level depends on the quality of management personnel. Asphalt production and construction are generally carried out at night, and are relatively continuous and time-consuming. As production proceeds, the fatigue of management personnel gradually accumulates, and vigilance and safety awareness gradually decrease. It is impossible to effectively supervise each production unit, equipment failure energy consumption, and plant safety issues in real time. If you want to achieve comprehensive supervision, you need to invest more manpower and increase labor costs. Based on the problems existing in the existing asphalt mixing plants, the following embodiments are provided:

[0047] Embodiment 1;

[0048] The present embodiment provides an intelligent environmentally friendly asphalt mixing station, a main tower 1, the main tower 1 has a screening layer, a hot material bin, a metering layer 2, a mixing tank 3, a trolley layer 11 and a discharge port; the connection between the components of the main tower 1 is provided with an encapsulation to enhance the sealing effect; the screening layer and the hot material bin are the existing components of the main tower, which will not be described in detail here;

[0049] A mechanical overflow bin 13, which is arranged at the front side of the main tower 1 to receive overflow materials;

[0050] Aggregate bin 20, which is arranged at one side of the main tower 1. Aggregates 23 stored in the aggregate bin 20 are transported to the drying drum 9 for heating and drying through the combined action of the sinking hopper belt conveyor 21, the first conveyor belt 22, the second conveyor belt 30, etc., and finally reach the main tower 1;

[0051] Dust recovery system, the dust recovery system is respectively connected to the conveying tunnel and discharge port at the bottom of the metering layer 2, the mixing tank 3, the mechanical overflow bin 13, and the aggregate bin 20 to recover dust;

[0052] The smoke recovery system is respectively connected to the trolley layer 11 and the discharge port to recover the smoke.

[0053] The dust recovery system includes a first dust removal module and a second dust removal module. The first dust removal module is respectively arranged at the metering layer 2 and the mixing tank 3, and the second dust removal module is respectively arranged at the mechanical overflow bin 13, the discharge port and the conveying tunnel at the bottom of the aggregate bin. The flue gas recovery system includes a flue gas purification device, a first flue gas duct 14 and a second flue gas duct 19. The two ends of the first flue gas duct 14 are respectively connected to the trolley layer 11 and the dust suction-smoke duct tap 16; the second flue gas duct 19 is respectively connected to the discharge port and the dust suction-smoke duct tap environmental protection facilities through the dust suction-smoke duct tap 16.

[0054] Specifically: the first dust removal module includes a first dust collector 8, a first induced air duct 4, a second induced air duct 5 and a dust collecting air duct 7. The first induced air duct 4 and the second induced air duct 5 are respectively connected to the metering layer 2 and the mixing cylinder 3, and are respectively installed with a first electric-controlled gate valve 6; the first induced air duct 4 and the second induced air duct 5 are both connected to the dust collecting air duct 7, and the dust collecting air duct 7 is connected to the first dust collector 8. Since the connection parts of the main tower 1 are sealed, the first induced air duct 4 and the second induced air duct 5 extend into the working areas of the metering layer 2 and the mixing cylinder 3 respectively. When the upper gate of the metering layer 2 is opened and the material falls into the metering layer 2 for weighing, the first electrically controlled gate valve 6 on the first induced air duct 4 is opened, and the negative pressure of the metering layer 2 is maintained through the induced air equipment of the first dust collector 8, reducing the jitter of the material scale pressure sensor during weighing, stabilizing the material measurement and improving the measurement accuracy. At the same time, the negative pressure difference between the main tower and the external environment is used to reduce the leakage of dust to the gaps of the mechanical connections of the main tower; when the lower gate of the metering layer 2 is opened, the material falls into the mixing cylinder 3 and the mixing cylinder 3 is discharged to the trolley layer 11 after the mixing is completed, the first electrically controlled gate valve 6 on the second induced air duct 5 is opened, and the negative pressure of the mixing cylinder 3 is maintained through the induced air equipment of the first dust collector 8. Similarly, the leakage of dust and asphalt fume is reduced by negative pressure. The feedback adjustment of the negative pressure value is realized by the negative pressure sensor 10 in the mixing cylinder 3 and the drying drum 9.

[0055] The second dust removal module includes a second dust collector 18, a third induced air duct 17, a suction duct 24, a branch air duct 25, and a second dust hood 26. The two ends of the third induced air duct are respectively connected to the second dust collector 18 and the dust-smoke duct branch joint 16, the dust-smoke duct branch joint 16 is connected to the mechanical overflow bin 13, the dust-smoke duct branch joint 16 is connected to the first dust hood 15, and the first dust hood is connected to the discharge port. One end of the second dust collector is connected to the suction duct 24, and the suction duct 24 is connected to the second dust hood 26 through the branch air duct 25. The second dust hood 26 is located on the discharge port of the sunken hopper belt conveyor 21 of the aggregate bin 20. The interface of the mechanical overflow bin 13 is connected to the overflow pipe of the main tower 1. During the production process, the second dust collector is turned on, and the dust from the overflow of the mechanical overflow bin 13 is adsorbed through the third induced air duct 17, and the dust-smoke duct tap 16 and the first dust hood 15 are used to remove dust from the dusty raw aggregate discharged after cleaning the mixing tank. In addition, taking six bins as an example, the six bins of the aggregate bin 20 are arranged side by side, and each bin of the aggregate bin 20 is provided with two sinking hopper belt conveyors 21 on the ground, and an underground tunnel 29 is provided at the bottom of the aggregate bin 20. The underground tunnel 29 is arranged with a first conveyor belt 22. Aggregates fall from the hopper of the sinking hopper belt conveyor 21, and are thrown to the first conveyor belt 22 by the sinking hopper belt conveyor 21, and then transported to the second conveyor belt 30 by the first conveyor belt 22, and finally reach the drying drum 9. Aggregates 23 of various specifications for producing asphalt mixture are stored in the aggregate bin 20. One end of the second dust collector 18 is provided with a suction pipe 24, which leads to the underground tunnel 29 and is arranged parallel to the first conveyor belt 22. The suction pipe 24 is provided with a branch air pipe 25, and the branch air pipe 25 is located at the second dust hood 26 connected to the throwing port of the sinking hopper belt conveyor 21. A pneumatic flap door 27 is installed between the branch air pipe 25 and the second dust hood 26. The second dust collector 18 is provided with a discharge port 28 located above the second conveyor belt 30, and a pneumatic flap door 27 is also provided in the middle.

[0056] The flue gas recovery system includes a flue gas purification device, a first flue gas duct 14, a second flue gas duct 19, and a dust suction-smoke duct tap 16. When the asphalt mixture in the mixing tank is mixed and discharged to the trolley layer 11, and when the mixture is discharged from the discharge port to the transport vehicle, the first flue gas duct 14 absorbs the flue gas from the trolley layer to the flue gas purification device via the dust suction-smoke duct tap 16 and the second flue gas duct 19; the second flue gas duct 19 is connected to the air suction port at the bottom of the discharge port through the dust suction-smoke duct tap 16, and absorbs the flue gas from the discharge port to the flue gas purification device.

[0057] In particular, the dust suction-smoke duct tap 16 has an electric control gate. When dust is adsorbed, the third induced air duct 17 is opened and the second smoke duct 19 is closed. When smoke is adsorbed, the third induced air duct 17 is closed and the second smoke duct 19 is opened. This can prevent dust from mixing with asphalt smoke and adhering to or blocking the pipe section.

[0058] Through the above-mentioned arrangement, the metering layer 2, mixing cylinder 3, mechanical overflow bin 13, aggregate bin 20 and discharge port of the asphalt mixing station that can generate dust are provided with dust recovery structures accordingly, and the trolley layer 11 and discharge port that can generate smoke of the asphalt mixing station are provided with smoke recovery structures accordingly, thereby realizing all-round dust and smoke prevention of the asphalt mixing station and improving the degree of environmental protection.

[0059] The working principle of the solution in the above embodiment is as follows:

[0060] When in use, the production of asphalt mixture will generate a large amount of dust and asphalt fume, and the overflow will be discharged. The dust is mainly generated by the falling of stones and powders and the falling of overflows to the ground. When the aggregate 23 falls, the first electrically controlled gate valve 6 opens, and the first dust collector 8 simultaneously exhausts the metering layer 2 and the mixing cylinder 3. The opening size of the first electrically controlled gate valve 6 is adjusted according to the feedback data of the negative pressure sensor 10, so that the main tower 1 is always maintained at the required negative pressure, greatly reducing the discharge of dust. In addition, the second dust collector 18 and the first dust hood 15 work synchronously, and the dust and flue gas are introduced into the dust collector and the flue gas purification and environmental protection equipment respectively through the first flue gas duct 14 and the third air duct connected to the trolley layer 11 and the first dust hood 15. For the disposal of overflow materials, a mechanical overflow bin 13 is installed in front of the main tower 1, and all the overflow materials will fall into the bin through the top interface 12 of the overflow bin. During the falling process of the overflow materials, the second dust collector 18 will remove the dust from the overflow bin, and the overflow materials in the bin will be unloaded to the material truck or loader through the unloading hopper at the bottom of the bin for reuse.

[0061] Compared with the existing asphalt mixing station with a single suction pipe, the first induced air duct 4 and the second induced air duct 5 are extended from the original suction pipe of the equipment. The induced air duct equipped with the negative pressure sensor 10 in this embodiment can effectively prevent the leakage of dust and smoke from the key parts of the main tower 1 and maintain the negative pressure in the tower. For the mixing station equipped with asphalt hot regeneration equipment, it can also stabilize the pressure fluctuation of the metering scale caused by the evaporation of water vapor when the regenerated material is unloaded to the metering layer 2 and the mixing tank 3, ensure the metering stability, improve the metering accuracy, make the mix ratio more accurate, and ensure the quality of the finished product.

[0062] During production, the aggregate 23 will also generate a lot of dust during transportation. For the ground sinking bin structure that is currently widely used, the underground tunnel 29 will be full of dust. On the one hand, it will cause dust accumulation on the ground and a large amount of cleaning work. On the other hand, if the belt conveyor system fails and emergency maintenance is required, the visibility in the tunnel is low and a long dust settlement time is required.

[0063] Compared with the existing ground sink structure, there are few underground dust removal systems. The suction pipe 24 and the second dust hood 26 are arranged in the ground sink structure. Dust is removed by the second dust collector 18, which can greatly reduce the dust in the underground tunnel during the production process. The collected dust is also the raw material stone powder that can be used in production. It can be directly put into the conveyor belt for production through the discharge port 28, which saves resources to a certain extent.

[0064] Embodiment 2:

[0065] The asphalt mixing station of this embodiment includes an asphalt tank area and boiler equipment. The asphalt tank area includes an asphalt tank 32, an asphalt pump and an asphalt unloading pool 39. There are three asphalt pumps. The inlet of the two asphalt pumps is connected to the asphalt tank 32, and both are connected to the asphalt unloading pool 39; the remaining asphalt pumps are connected to the asphalt tank 32, and the asphalt tank 32 is also connected to a pipeline interface 38, which is used to connect an external asphalt spreading vehicle pump; the boiler equipment heats the heat transfer oil to circulate the heat transfer oil to heat the asphalt in the asphalt tank 32. An agitator 35 is installed in the asphalt tank 32 to stir the asphalt to prevent solidification; the three asphalt pumps are divided into a first asphalt pump 36 and two second asphalt pumps 37. The first asphalt pump 36 is mainly used for expansion and extension, for example, as a base asphalt supply interface for connecting the asphalt tank 32 with the expansion asphalt tank or connecting the rubber asphalt equipment. The asphalt in the asphalt tank 32 is pumped into the tank through the asphalt unloading pool 39 and the second asphalt pump 37. The second asphalt pump 37 pumps the asphalt into the asphalt tank 32 or out of the asphalt tank 32, and one of them is used as a fault backup. Taking the parallel connection of six asphalt tanks 32 as an example, a total of six electric gate valves 33 are set in the pipelines between the six asphalt tanks 32 to automatically control the on and off of the heat transfer oil circulation pipeline. The pneumatic butterfly valve 31 mainly controls the on and off of the asphalt pipeline, and the manual gate valve 34 is mainly used for disconnection during maintenance.

[0066] The boiler equipment includes an oil tank 40, a natural gas supply source 41, a boiler burner 42, a circulation pump 45, a boiler high-level oil tank 47 and a heat transfer oil circulation pipeline. The oil or natural gas in the oil tank 40 enters the boiler burner 42 to ignite and heat the circulating heat transfer oil. A flame sensor is installed in the boiler equipment to control the flame indication 43 of the control system. The circulation pump 45 is connected to the heat transfer oil circulation pipeline. The heat transfer oil circulation pipeline is wound around the asphalt tank 32. The boiler burner heats the heat transfer oil circulation pipeline. The boiler high-level oil tank is connected to the circulating heat transfer oil return pipe, and the connection point is located in front of the circulation pump; the circulating heat transfer oil used to heat the asphalt circulates and flows between the boiler burner 42, the asphalt tank 32 and the asphalt unloading pool 39 through the circulation pump 45 for heating. The heat transfer oil is stored in the boiler high-level oil tank 47 and can be automatically compensated. The oil tank has a liquid level display, and the control system can monitor the situation of the boiler high-level oil tank 47.

[0067] The parts not mentioned in this embodiment are the same as those in the first embodiment.

[0068] Embodiment three;

[0069] An intelligent environmentally friendly asphalt mixing station of the present embodiment includes a fuel supply system and a drying drum 9. The drying drum 9 is used to dry the aggregate 23 transported from the aggregate bin 20 to the main tower 1. The fuel supply system includes a fuel tank 48, a first oil pump 49, a second oil pump 53, a relay tank 51, a low-level oil supply pipe 54, a high-level oil supply pipe 57, a low-level oil return pipe 55, a high-level oil return pipe 58 and an oil return main pipe 59. The fuel tank 48 is pumped out through the first oil pump 49, and after reaching the relay tank 51, it is pumped to the low-level burner 60 and the high-level burner 61 through the low-level oil supply pipe 54 and the high-level oil supply pipe 57 through the second oil pump 53; the return oil returns to the oil return main pipe 59 through the low-level oil return pipe 55 and the high-level oil return pipe 58 respectively. Among them, the relay tank 51 has a liquid level display, and is equipped with a frequency conversion feedback negative pressure sensor 52 and a relief valve 50 to ensure the safety and real-time adjustment of the tank oil pressure during long-term transportation and prevent the tank pressure from being too high. The high-level oil supply pipe 57 is equipped with a check valve 56 and installed on the ground to facilitate short circuit maintenance. The relief valve 50 is connected to the oil return main pipe, and the high-level oil supply pipe is equipped with a check valve 56. It should be noted that the first oil pump 49 stabilizes the pumping pressure required by the low-level burner 60 or the high-level burner 61 when transporting fuel over long distances, and the second oil pump 53 adjusts the pressure of direct oil supply to the corresponding burner according to the actual temperature required for production.

[0070] For fuel supply, compared with the single pump delivery currently used in mixing stations, this embodiment adopts a relay tank 51 to cooperate with a double pump constant pressure oil supply. The fuel tank 48 is pumped to the relay tank 51 through the first oil pump 49, and then pumped to the low-level burner 60 and the high-level burner 61 through the second oil pump 53. When the oil pressure required by the burner changes, especially when the required fuel pressure decreases, the power at both ends of the single pump delivery pump remains unchanged, and the first oil pump 49 always maintains the pumping pressure required for long-distance delivery. The corresponding burner required oil pressure and the pumping pressure of the second oil pump 53 are frequency-converted and controlled to maintain a dynamic stable state, making the production process fuel supply system efficient, safe, and stable, and extending the life of the oil pump. Each pump group cooperates with the corresponding electrical components, and automation and remote control can be achieved through the master control system.

[0071] The parts not mentioned in this embodiment are the same as those in the second embodiment.

[0072] Embodiment 4:

[0073] The asphalt mixing plant of this embodiment further includes a control system, and the control system includes a controller;

[0074] The first induced air duct 4 and the second induced air duct 5 are both provided with a first electrically controlled gate valve 6, and the controller controls the first induced air duct 4 and the second induced air duct 5 to be connected or closed by controlling the first electrically controlled gate valve 6;

[0075] The mixing cylinder 3 and the drying drum 9 are both provided with a negative pressure sensor 10 , and the controller receives the signal of the negative pressure sensor 10 ; the controller controls the opening size of the first electrically controlled gate valve 6 through the feedback value of the negative pressure sensor 10 .

[0076] The air suction pipe 24, the tapping air pipe 25 and the discharge port of the second dust collector 18 are all provided with pneumatic flap doors. The controller controls the on-off of the airflow in the air suction pipe and the tapping air pipe by controlling the pneumatic flap doors. The controller controls the on-off of the discharge port of the second dust collector by controlling the pneumatic flap doors.

[0077] The heat transfer oil inlet of the asphalt tank 32 is provided with an electric gate valve 33, and the heat transfer oil outlet of the asphalt tank 32 is provided with a manual gate valve 34, which plays a cut-off role during maintenance. The electric gate valve 33 is electrically connected to the controller for remote control of on and off;

[0078] The inlet and outlet of the asphalt tank 32 are both provided with a pneumatic butterfly valve 31, which is connected to a controller to control the on-off of the asphalt pipeline of the asphalt tank 32;

[0079] A pressure level sensor and a first temperature sensor 44 are provided in the asphalt tank 32, and both the pressure level sensor and the temperature sensor are electrically connected to the controller;

[0080] The operation cabinet of the boiler equipment is connected to the controller;

[0081] A flame sensor is provided in the boiler burner 42, and the flame sensor is connected to the controller;

[0082] The inlet and outlet of the boiler burner 42 are provided with a pressure sensor and a second temperature sensor, and both the pressure sensor and the second temperature sensor are electrically connected to the controller;

[0083] The circulation pump 45 is equipped with an alarm 46 , which is electrically connected to the controller.

[0084] The operation of the controller for the boiler equipment is that after the circulating pump 45 is selected to display the valve in the open and closed position, click the "start button" to start, and then click the "stop button" to stop; click the start button of the boiler burner 42 to start ignition, and then click to stop. The boiler burner 42 can be reset by returning to the fault reset controller; click the boiler burner 42 to automatically, and then click to release; the high fire / low fire conversion adopts inching.

[0085] The parts not mentioned in this embodiment are the same as those in the third embodiment.

[0086] For the management of asphalt tank area and boiler equipment, compared with the existing independent operation of the two, that is, the operating system of the mixing station equipment operates and controls the asphalt tank area, and the boiler equipment is operated by its control cabinet alone. A certain number of pneumatic butterfly valves 31, manual gate valves 34, and electric gate valves 33 are used to connect the asphalt unloading pool 39 and the boiler equipment respectively to realize automatic control of pipeline on and off. The operating cabinet of the boiler equipment is connected to the controller, and a flame sensor is installed in the boiler equipment to control the flame indication 43 of the system. In addition, inlet and outlet pressure and temperature sensors are installed to monitor the pressure and temperature indication of the system. The circulating pump 45 is installed with an alarm 46 to control the indication of abnormal operation of the circulating oil, realizing the automatic control of the asphalt-heat transfer oil part of the production process. In terms of safety supervision, various sensors and alarms 46 realize remote monitoring of the main outlet overtemperature, exhaust gas overtemperature, outlet low pressure, low flow, liquid level and combustion failures that occur during boiler operation. These sensors are connected to the system for effective and reliable real-time monitoring with fast feedback. Together with the installation of monitoring devices in key areas and locations such as near the furnace body in the boiler room, near the pump group in the asphalt tank area, at the oil unloading pool, near the fuel tank and oil pump, efficient and intelligent supervision of the asphalt tank area, fuel supply system and boiler equipment can be achieved.

[0087] In this embodiment, the control of the values ​​of temperature, pressure, etc. is adjusted according to actual production.

[0088] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. An intelligent and environmentally friendly asphalt mixing station, characterized in that: include: The main tower has a metering layer, a mixing tank, a trolley layer and a discharge port; Mechanical overflow bin, which is set at the front side of the main tower; Aggregate silo: The aggregate silo is set on one side of the main tower, and the aggregate silo supplies aggregates to the main tower; Dust recovery system: The dust recovery system is connected to the metering layer, mixing tank, mechanical overflow bin, aggregate bin and discharge port to recover dust; The smoke recovery system is respectively connected to the trolley layer and the discharge port to recover the smoke.

2. According to the intelligent and environmentally friendly asphalt mixing plant of claim 1, it is characterized by: The dust recovery system includes a first dust removal module and a second dust removal module. The first dust removal module is respectively arranged at the metering layer and the mixing tank, and the second dust removal module is respectively arranged at the mechanical overflow bin, the discharge port and the conveying tunnel at the bottom of the aggregate bin.

3. According to the intelligent and environmentally friendly asphalt mixing station of claim 2, it is characterized by: The first dust removal module includes a first dust collector, a first induced air duct, a second induced air duct and a dust collecting air duct. The first induced air duct and the second induced air duct are respectively connected to the metering layer and the mixing cylinder; the first induced air duct and the second induced air duct are both connected to the dust collecting air duct, and the dust collecting air duct is connected to the first dust collector.

4. The intelligent and environmentally friendly asphalt mixing station according to claim 2 is characterized in that: The second dust removal module includes a second dust collector, a third induced air duct, a suction duct, a branch air duct and a second dust hood. The two ends of the third induced air duct are respectively connected to the second dust collector and the dust-smoke duct branch joint, the dust-smoke duct branch joint is connected to the mechanical overflow bin, the dust-smoke duct branch joint is also connected to the first dust hood, and the first dust hood is arranged at the unloading port; one end of the second dust collector is connected to the suction duct, the suction duct is connected to the second dust hood through the branch air duct, and the second dust hood is located above the discharge port of the sunken hopper belt conveyor of the aggregate bin.

5. The intelligent and environmentally friendly asphalt mixing station according to claim 4 is characterized in that: The flue gas recovery system includes a flue gas purification device, a first flue gas duct and a second flue gas duct. The two ends of the first flue gas duct are respectively connected to the trolley layer and the dust suction-smoke duct branch joint; the second flue gas duct is respectively connected to the discharge port and the flue gas purification device through the two ends of the dust suction-smoke duct branch joint.

6. The intelligent and environmentally friendly asphalt mixing station according to claim 1 is characterized in that: It also includes a fuel supply system, a high-position drying drum and a low-position drying drum. The high-position drying drum is used to dry asphalt recycled materials, and the low-position drying drum is used to dry aggregates transported from the aggregate bin to the main tower. The fuel supply system includes a fuel tank, a first oil pump, a second oil pump, a relay tank, a low-position oil supply pipe, a high-position oil supply pipe, a low-position oil return pipe, a high-position oil return pipe and an oil return pipe. The first oil pump is connected to the fuel tank through a pipeline, the relay tank is connected to the first oil pump through a pipeline, the second oil pump is connected to the relay tank through a pipeline, and the second oil pump is connected to the low-position oil supply pipe and the high-position oil supply pipe respectively; the low-position drying drum and the high-position drying drum are respectively provided with a low-position burner and a high-position burner, and the low-position oil supply pipe and the high-position oil supply pipe are respectively connected to the low-position burner and the high-position burner; the low-position oil return pipe and the high-position oil return pipe are respectively connected to the low-position burner and the high-position burner, and the low-position oil return pipe and the high-position oil return pipe are both connected to the oil return pipe, and the oil return pipe is connected to the fuel tank.

7. The intelligent and environmentally friendly asphalt mixing station according to claim 1 is characterized in that: Also includes: Boiler equipment, boiler equipment is used to heat thermal oil; Asphalt tank area: the asphalt tank area is connected to the boiler equipment to heat the asphalt, and the asphalt tank area is connected to the main tower to supply asphalt to the main tower for mixing with aggregates.

8. An intelligent and environmentally friendly asphalt mixing station according to claim 7, characterized in that: The asphalt tank area includes asphalt tanks, asphalt pumps and asphalt unloading pools. There are three asphalt pumps, two of which are connected to the inlet of the asphalt tank and to the asphalt unloading pool; the remaining asphalt pumps are connected to the outlet of the asphalt tank, serving as the matrix asphalt supply interface for connecting the asphalt tank to the expansion asphalt tank or to the rubber asphalt equipment; the asphalt tank is also connected to a pipeline interface for supplying an asphalt spreader; the boiler equipment heats the heat transfer oil to circulate and heat the asphalt in the asphalt tank.

9. An intelligent and environmentally friendly asphalt mixing station according to claim 8, characterized in that: The boiler equipment includes an oil tank, a natural gas supply source, a boiler burner, a circulating pump, a circulating heat oil return pipe, a boiler high-level oil tank and a heat oil circulation pipeline. The oil tank and the natural gas supply source are connected to the boiler burner, the circulating pump is connected to the heat oil circulation pipeline, the heat oil circulation pipeline is wrapped around the asphalt tank, the boiler burner heats the heat oil circulation pipeline, the boiler high-level oil tank is connected to the circulating heat oil return pipe, and the connection point is located in front of the circulating pump.

10. An intelligent and environmentally friendly asphalt mixing station according to any one of claims 1 to 9, characterized in that: Also included is a control system, the control system including a controller; The first air induced duct and the second air induced duct are both provided with a first electrically controlled gate valve, and the controller controls the first air induced duct and the second air induced duct to be connected or closed by controlling the first electrically controlled gate valve; The air suction pipe, the branch air pipe and the discharge port of the second dust collector are all provided with pneumatic flap doors. The controller controls the on-off of the airflow in the air suction pipe and the branch air pipe by controlling the pneumatic flap doors. The controller controls the on-off of the discharge port of the second dust collector by controlling the pneumatic flap doors. The mixing cylinder and the drying drum are both provided with negative pressure sensors, and the controller receives signals from the negative pressure sensors; The heat transfer oil inlet of the asphalt tank is equipped with an electric gate valve, and the heat transfer oil outlet of the asphalt tank is equipped with a manual gate valve. The electric gate valve is electrically connected to the controller for remote control of on and off; The inlet and outlet of the asphalt tank are both equipped with pneumatic butterfly valves, which are connected to the controller to remotely control the opening and closing of the inlet and outlet of the asphalt tank; A pressure level sensor and a first temperature sensor are provided in the asphalt tank, and both the pressure level sensor and the temperature sensor are electrically connected to the controller; A flame sensor is provided in the boiler burner, and the flame sensor is connected to the controller; The inlet and outlet of the boiler burner are provided with a pressure sensor and a second temperature sensor, and the pressure sensor and the second temperature sensor are both electrically connected to the controller; The circulation pump is equipped with an alarm, which is electrically connected to the controller.

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