Ventilation Structure of Asphalt Concrete Processing Workshop

Abstract

The present application provides a ventilation structure for an asphalt concrete processing workshop, belonging to the field of asphalt concrete processing. The high-temperature harmful gas generated by asphalt heating enters the heat exchange channel through the waste gas collection hood. The high-temperature harmful gas exchanges heat with the heat exchange tube group to recover the heat in the high-temperature harmful gas. The water mist sprayed by the water distribution nozzle of the air intake unit enters the heat exchange tube group and can absorb a large amount of heat to form saturated water vapor. After the saturated water vapor enters the screening preheating tube group, the aggregate is preheated by blowing air with a preheating fan. Finally, the air flow in the screening preheating tube group and the dust-containing gas collected by the dust collection hood are mixed in the cyclone separator. The condensation of water vapor causes the dust to agglomerate and be separated by the cyclone separator, thereby reducing the filter consumption of the dust treatment equipment. The aggregate is preheated by using the heat of the harmful gas, and the heat utilization is more sufficient. The condensation and dust reduction of water vapor in the cyclone separator can prevent the filter element of the dust treatment equipment from being blocked by muddy water.

Description

Technical Field

[0001] This application belongs to the technical field of asphalt concrete processing, and more specifically, relates to a ventilation structure for an asphalt concrete processing workshop. Background Art

[0002] Asphalt concrete is a common building material. In production, asphalt concrete is made by mixing asphalt and concrete powder in a certain proportion and heating. During this process, a large amount of dust and harmful gases are often generated.

[0003] During the production process of asphalt concrete, cold aggregates need to be screened, heated and dried, and then the asphalt is heated and mixed with hot aggregates and other additives. Since a large amount of dust is generated during the screening process of cold aggregates, a corresponding dust removal system is equipped in the workshop; and a large amount of high-temperature harmful gases are generated during the asphalt heating and subsequent mixing processes, so a corresponding waste gas treatment system is also equipped in the workshop. However, the current dust removal system in the workshop has a heavy burden due to the large amount of dust, consumes more filter screens, and has a high use cost. When the waste gas treatment system treats high-temperature harmful gases, the heat therein cannot be effectively utilized, resulting in energy waste. Summary of the Invention

[0004] In view of this, the embodiments of this application provide a ventilation structure for an asphalt concrete processing workshop to solve the technical problems in the prior art that the filter screens of the dust removal system in the asphalt concrete workshop consume more, and the waste gas treatment system has energy waste.

[0005] To achieve the above object, the technical solution adopted in this application is:

[0006] On the one hand, a ventilation structure for an asphalt concrete processing workshop is provided, including:

[0007] An exhaust gas collection hood, which is covered on the asphalt heating equipment and is suitable for collecting high-temperature harmful gases;

[0008] A heat exchange channel, with the front end connected to the exhaust gas collection hood and the rear end connected to the exhaust gas treatment equipment;

[0009] A heat exchange tube group, which is arranged in parallel in the heat exchange channel;

[0010] An air intake unit, which is connected to the front end of the heat exchange tube group and is internally provided with water spraying nozzles; the water mist sprayed by the water spraying nozzles enters the heat exchange tube group along with the air flow and evaporates into a gas state in the heat exchange tube group, so that the water vapor in the air flow reaches saturation;

[0011] A screening preheating tube group, which is arranged on the side of the aggregate screening equipment and is connected to the rear end of the heat exchange tube group;

[0012] A preheating fan is provided on the back of the screening and preheating pipe group to drive air flow through the screening and preheating pipe group and blow it onto the aggregate on the aggregate screening device.

[0013] A dust collection hood is provided on the top of the aggregate screening device and is adapted to collect the dust-containing gas generated by the aggregate screening device.

[0014] A cyclone separator has heat dissipation fins on its outer wall, and its inlet is respectively communicated with the dust collection hood and the rear end of the screening and preheating pipe group.

[0015] In some embodiments, the screening and preheating pipe group includes a plurality of preheating pipes, and each of the preheating pipes undulates up and down.

[0016] The screening and preheating pipe group further includes a water collecting pipe which is vertically arranged and communicates with the lower parts of each of the preheating pipes; a dust removal nozzle is provided at the lower end of the water collecting pipe, and the dust removal nozzle faces directly below the aggregate screening device and is adapted to spray water mist to moisten the impurities screened out by the aggregate screening device.

[0017] In some embodiments, the lower end of the water collecting pipe is connected to the dust removal nozzle through a one-way valve, and the conduction direction of the one-way valve is from the water collecting pipe to the dust removal nozzle; the dust removal nozzle is also connected to a high-pressure water supply pipe.

[0018] When there is accumulated water in the water collecting pipe, the sum of the gravity of the accumulated water and the gas pressure in the water collecting pipe is greater than the pressure of the high-pressure water supply pipe, and the water collecting pipe is conducted with the dust removal nozzle through the one-way valve.

[0019] When all or part of the accumulated water in the water collecting pipe is discharged, the gas pressure in the water collecting pipe is less than the pressure of the high-pressure water supply pipe, and the one-way valve blocks the water collecting pipe and the dust removal nozzle.

[0020] In some embodiments, the two side edges of the screen of the aggregate screening device are bent upward, and two groups of the screening and preheating pipe groups are respectively located outside the two side edges of the screen and are inclined towards the middle of the screen.

[0021] In some embodiments, the aggregate screening device includes at least two stages of screening units arranged in sequence, and the screening and preheating pipe group is located on the side of the screening unit after the first stage.

[0022] In some embodiments, a partition net is provided in the preheating pipe, the partition net is close to the lower wall of the preheating pipe and divides the inner cavity of the preheating pipe into an upper air flow channel and a lower water flow channel, and the upper end of the mesh holes of the partition net inclines backward.

[0023] In some embodiments, according to the flow rate and dust content rate of the dusty gas flowing from the dust collection hood into the cyclone separator, the rotation speed of the preheating fan is controlled, and further, the water content of the air flow flowing from the screening preheating pipe group into the cyclone separator is controlled.

[0024] The beneficial effects of the ventilation structure of the asphalt concrete processing workshop provided by the embodiments of the present application are as follows: Compared with the prior art, in the ventilation structure of the asphalt concrete processing workshop of the embodiments of the present application, the high-temperature harmful gas generated by asphalt heating enters the heat exchange channel through the waste gas collection hood, and the high-temperature harmful gas exchanges heat with the heat exchange tube group to recover the heat in the high-temperature harmful gas; the water mist sprayed by the water distribution nozzle of the air intake unit enters the heat exchange tube group and can absorb a large amount of heat to form saturated water vapor; after the saturated water vapor enters the screening preheating pipe group, the preheating fan blows to transfer the heat of the screening preheating pipe group to the aggregate on the aggregate screening equipment to preheat the aggregate; finally, the air flow in the screening preheating pipe group and the dusty gas collected by the dust collection hood are mixed in the cyclone separator, and the water vapor condenses when it meets cold, causing the dust in the dusty gas to agglomerate, so that it is separated by the cyclone separator, reducing the load of the subsequent dust treatment equipment, and further reducing the consumption of the filter screen;

[0025] The heat of the harmful gas is used to preheat the aggregate, and the heat utilization is more sufficient; in addition, compared with the traditional spray dust reduction, the water vapor condenses and dusts in the cyclone separator, and the dust is wetted more evenly, and at the same time, it can also avoid the filter element of the dust treatment equipment being blocked by muddy water due to excessive water volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for description in the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic diagram of the waste gas collection hood, heat exchange channel, air intake unit, heat exchange tube and other structures of the ventilation structure of the asphalt concrete processing workshop provided by the embodiments of the present application;

[0028] Figure 2 It is a schematic diagram of the aggregate screening equipment, preheating pipe, preheating fan, dust collection hood, cyclone separator and other structures of the ventilation structure of the asphalt concrete processing workshop provided by the embodiments of the present application;

[0029] Figure 3 For Figure 2 the schematic diagram of the structure of the aggregate screening equipment in

[0030] Figure 4 ForFigure 3 Schematic cross-sectional view of the screening unit shown in

[0031] Figure 5 is Figure 4 Schematic diagrams of structures such as the preheating pipe and the water collecting pipe in

[0032] Among them, each reference numeral in the figure:

[0033] 1 - Exhaust gas collection hood; 2 - Heat exchange channel; 3 - Heat exchange pipe; 4 - Intake unit; 41 - Water distribution nozzle; 5 - Preheating pipe; 51 - Isolation net; 52 - Preheating fan; 53 - Water collecting pipe; 54 - Dust removal nozzle; 55 - Check valve; 56 - High-pressure water supply pipe; 6 - Dust collection hood; 7 - Cyclone separator; 71 - Heat sink; 8 - Aggregate screening equipment; 81 - Screening unit; 82 - Screen mesh. Specific implementation manners

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" and "several" is two or more, unless otherwise specifically defined.

[0038] Please refer to Figures 1 to 5, the ventilation structure of the asphalt concrete processing workshop provided by the embodiments of the present application will now be described. A ventilation structure of an asphalt concrete processing workshop includes: an exhaust gas collection hood, a heat exchange channel, a heat exchange tube group, an air intake unit, a screening preheating tube group, a preheating fan, a dust collection hood, and a cyclone separator. Each part of the ventilation structure of the asphalt concrete processing workshop is connected by pipelines, and except for the air intake unit providing power for the air flow, fans can be added between each part as needed to increase the air flow power.

[0039] The exhaust gas collection hood is arranged on the asphalt heating equipment and is suitable for collecting high-temperature harmful gases.

[0040] The front end of the heat exchange channel is connected to the exhaust gas collection hood, and the rear end is connected to the exhaust gas treatment equipment. The heat exchange channel is relatively close to the exhaust gas collection hood, so that the high-temperature harmful gases can directly enter the heat exchange channel for heat exchange. The harmful gases discharged from the rear end of the heat exchange channel still have a certain temperature, and additional cooling equipment can be selected according to the requirements of the subsequent exhaust gas treatment equipment.

[0041] The heat exchange tube group is arranged in parallel in the heat exchange channel. The heat exchange tube group is arranged horizontally or can be slightly inclined so that the unevaporated water can flow out from one end.

[0042] The air intake unit is connected to the front end of the heat exchange tube group and is internally provided with water spraying nozzles; the water mist sprayed by the water spraying nozzles enters the heat exchange tube group along with the air flow and evaporates into gas in the heat exchange tube group, making the water vapor in the air flow reach saturation. The air intake unit can use a blower to blow the air flow into the heat exchange tube group, and the water spraying nozzles spray water mist into the air flow so that the water mist enters the heat exchange tube group along with the air flow.

[0043] The screening preheating tube group is arranged on the side of the aggregate screening equipment and is connected to the rear end of the heat exchange tube group; the screening preheating tube group is arranged on the side of the aggregate screening equipment to avoid affecting the original function of the aggregate screening equipment.

[0044] The preheating fan is arranged on the back of the screening preheating tube group and drives the air flow to flow through the screening preheating tube group and blow onto the aggregates on the aggregate screening equipment. The preheating fan can adjust the rotation speed to control the temperature of the screening preheating tube group.

[0045] The dust collection hood is arranged on the top of the aggregate screening equipment and is suitable for collecting the dust-containing gas generated by the aggregate screening equipment. The specific structure and installation method of the dust collection hood can refer to the existing dust removal equipment.

[0046] The cyclone separator has heat dissipation fins on its outer wall, and the inlets are respectively connected to the dust collection hood and the rear end of the screening preheating tube group.

[0047] Compared with the prior art, in the ventilation structure of the asphalt concrete processing workshop according to the embodiment of the present application, the high-temperature harmful gas generated by asphalt heating enters the heat exchange channel through the waste gas collection hood. The high-temperature harmful gas exchanges heat with the heat exchange tube group to recover the heat in the high-temperature harmful gas. The water mist ejected by the water distribution nozzle of the air intake unit enters the heat exchange tube group, which can absorb a large amount of heat to form saturated water vapor. After the saturated water vapor enters the screening preheating tube group, the preheating fan transfers the heat of the screening preheating tube group to the aggregate on the aggregate screening equipment through blowing to preheat the aggregate. Finally, the airflow in the screening preheating tube group is mixed with the dust-containing gas collected by the dust collection hood in the cyclone separator. The water vapor condenses when it meets the cold, causing the dust in the dust-containing gas to agglomerate, so that it can be separated by the cyclone separator, reducing the load of the subsequent dust treatment equipment and thus reducing the consumption of the filter screen.

[0048] The heat of the harmful gas is used to preheat the aggregate, and the heat utilization is more sufficient. In addition, compared with the traditional spray dust reduction, the water vapor condenses and dusts in the cyclone separator, and the wetting of the dust is more uniform. At the same time, it can also avoid the filter element of the dust treatment equipment being blocked by muddy water due to excessive water volume.

[0049] In actual implementation, the temperature after asphalt heating can reach 150-190°C, and the temperature of the generated harmful gas can reach about 130°C. The water vapor generated in the heat exchange tube group can reach 80-110°C, and the temperature drops to 45-60°C after passing through the screening preheating tube group. Finally, the water vapor enters the cyclone separator and mixes with the dust-containing gas. Coupled with the heat dissipation of the heat dissipation fins of the cyclone separator, the temperature of the mixed gas basically reaches the normal temperature state.

[0050] Since the asphalt smoke volatilized by asphalt heating is mainly composed of liquid hydrocarbon or solid hydrocarbon particles and gaseous hydrocarbon derivatives, it is easy to adhere to the surface of the heat exchange tube group. Therefore, the fins on the heat exchange tubes of the heat exchange tube group can be set relatively sparse or even without fins to reduce the adhesion of impurities. During use, when the production line stops, it is necessary to clean the impurities adhered to the heat exchange tube group in time to avoid the impurities solidifying on the heat exchange tube group, so that when the production line is started again, the heat exchange tube group can quickly exchange heat.

[0051] The cyclone separator can be based on the prior art, and heat dissipation fins are welded on the outer shell to increase the heat dissipation capacity, so that the airflow flowing in from the screening preheating tube group is mixed with the dust-containing gas of the dust collection hood and the temperature is as low as possible after heat dissipation, so that the dust can be better wetted and agglomerated.

[0052] Please refer to Figure 2 、 Figure 4 and Figure 5 , as a specific implementation manner of the ventilation structure of the asphalt concrete processing workshop provided by the present application, the screening preheating tube group includes a plurality of preheating tubes, and each preheating tube undulates up and down.

[0053] The screening preheating pipe group further includes a water collecting pipe, which is vertically arranged and communicates with the lower parts of each preheating pipe; a dust removal nozzle is provided at the lower end of the water collecting pipe, facing directly below the aggregate screening device and adapted to spray water mist to moisten the impurities screened out by the aggregate screening device.

[0054] In this embodiment, after the air flow in the preheating pipe cools down, water droplets will condense, and the water droplets will gather at the lower part of the preheating pipe and enter the water collecting pipe, and finally spray out from the dust removal nozzle at the lower end of the water collecting pipe to perform spray dust removal on the impurities screened out by the aggregate screening device.

[0055] In specific implementation, the preheating pipes are in a V shape with a large angle, and multiple preheating pipes are arranged side by side from top to bottom. The water collecting pipe is vertically arranged and communicates with the lowest point of each preheating pipe. A plurality of dust removal nozzles are installed at the lower end of the water collecting pipe through a horizontal pipe.

[0056] Please refer to Figure 4 and Figure 5 , as a specific implementation manner of the ventilation structure of the asphalt concrete processing workshop provided by this application, the lower end of the water collecting pipe is connected to the dust removal nozzle through a one-way valve, and the conduction direction of the one-way valve is from the water collecting pipe to the dust removal nozzle; the dust removal nozzle is also connected to a high-pressure water supply pipe.

[0057] When there is accumulated water in the water collecting pipe, the sum of the gravity of the accumulated water and the gas pressure in the water collecting pipe is greater than the pressure of the high-pressure water supply pipe, and the water collecting pipe is conducted with the dust removal nozzle through the one-way valve.

[0058] When all or part of the accumulated water in the water collecting pipe is discharged, the gas pressure in the water collecting pipe is less than the pressure of the high-pressure water supply pipe, and the one-way valve blocks the water collecting pipe and the dust removal nozzle.

[0059] In this embodiment, when there is accumulated water in the water collecting pipe, the one-way valve opens, and the accumulated water in the water collecting pipe sprays out from the dust removal nozzle; when all or part of the accumulated water in the water collecting pipe is discharged, the one-way valve closes, and the high-pressure water supply pipe supplies water to the dust removal nozzle. This not only ensures that the accumulated water in the water collecting pipe can be discharged in time, but also avoids the air flow in the preheating pipe leaking from the dust removal nozzle when the amount of water in the water collecting pipe is small or there is no water, which not only cannot perform dust removal, but will instead raise dust.

[0060] In specific implementation, the lower end of the water collecting pipe is connected to a one-way valve, and the lower end of the one-way valve is connected to a three-way joint. The other two ports of the three-way joint are respectively connected to the dust removal nozzle and the high-pressure water supply pipe. On the one hand, the lower end of the water collecting pipe can be set longer, so that more accumulated water can be stored in the water collecting pipe, and the one-way valve is pushed open by the weight of the accumulated water and the gas pressure in the water collecting pipe; on the other hand, the one-way valve can also select an appropriate opening pressure, so that the accumulated water in the water collecting pipe will only open after reaching a certain amount.

[0061] Please refer to Figure 4, as a specific implementation of the ventilation structure of the asphalt concrete processing workshop provided in this application, the two side edges of the screen of the aggregate screening equipment are bent upward, and two groups of screening preheating pipe groups are respectively located outside the two side edges of the screen and are inclined towards the middle of the screen.

[0062] In this embodiment, on the one hand, the upward bending of the two side edges of the screen can prevent the aggregates from scattering from both sides. On the other hand, the airflow from the screening preheating pipe groups can directly blow the aggregates through the mesh holes on the side edges of the screen to preheat the aggregates.

[0063] In specific implementation, the aggregate screening equipment is usually a vibrating screen. The specific structure of the aggregate screening equipment can refer to the prior art, and only the two side edges of the screen need to be bent upward. The two groups of screening preheating pipe groups can be arranged on both sides of the aggregate screening equipment through independent brackets, or can be directly installed on both sides of the brackets of the aggregate screening equipment.

[0064] During operation, the aggregates vibrate and tumble on the aggregate screening equipment, and the airflow from the screening preheating pipe groups can pass through the gaps between the aggregates, so as to better preheat the aggregates.

[0065] Please refer to Figure 3 , as a specific implementation of the ventilation structure of the asphalt concrete processing workshop provided in this application, the aggregate screening equipment includes at least two stages of screening units arranged in sequence, and the screening preheating pipe group is located on the side of the screening unit after the first stage.

[0066] Generally, there is a lot of dust in the aggregates. After the aggregates pass through the first-stage screening unit, most of the dust has been removed. Setting the screening preheating pipe group on the side of the screening unit after the first stage can reduce the blowing up of the dust in the aggregates by the airflow from the preheating pipe group and will not generate too much dust.

[0067] Please refer to Figure 5 , as a specific implementation of the ventilation structure of the asphalt concrete processing workshop provided in this application, an isolation net is provided inside the preheating pipe. The isolation net is close to the lower wall of the preheating pipe and divides the inner cavity of the preheating pipe into an upper airflow channel and a lower water flow channel, and the upper end of the mesh holes of the isolation net is inclined backward.

[0068] In this embodiment, the airflow flows through the airflow channel above the isolation net, and the condensed water droplets flow through the water flow channel below the isolation net. The isolation net can prevent the airflow from taking away the condensed water droplets.

[0069] In specific implementation, the preheating pipe can be a flat square pipe, and the isolation net is welded inside it. The isolation net can be provided with inclined mesh holes by drilling or punching. The upper end of the mesh holes is inclined backward, so that the backward flowing airflow is not easy to enter the lower water flow channel along the mesh holes, reducing the water being taken away by the airflow.

[0070] As a specific implementation manner of the ventilation structure of the asphalt concrete processing workshop provided by the present application, the rotation speed of the preheating fan is controlled according to the flow rate and dust content rate of the dust-containing gas flowing from the dust collection hood into the cyclone separator, so as to control the water content of the air flow flowing from the screening preheating pipe group into the cyclone separator.

[0071] In this embodiment, when the flow rate and dust content rate of the dust-containing gas in the dust collection hood are small, since there is less dust, the required amount of water vapor is also less; when the flow rate and dust content rate of the dust-containing gas in the dust collection hood are large, since there is more dust, the required amount of water vapor is also more.

[0072] Under the condition of keeping the gas flow rate and water vapor saturation in the heat exchange pipe group, by controlling the rotation speed of the preheating fan, the amount of water vapor condensed in the screening preheating pipe in the air flow is controlled, so as to control the water content of the air flow flowing from the screening preheating pipe group into the cyclone separator, which can not only ensure the cooling effect on the high-temperature harmful gas and the preheating effect on the aggregate, but also avoid excessive water vapor entering the cyclone separator, generating muddy water and affecting the subsequent dust treatment equipment.

[0073] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Ventilation structure for asphalt concrete processing workshop, characterized in that, Comprising: An exhaust gas collection hood, which is arranged on the asphalt heating equipment and is suitable for collecting high-temperature harmful gases; A heat exchange channel, with the front end communicated with the exhaust gas collection hood and the rear end communicated with the exhaust gas treatment equipment; A heat exchange tube group, which is arranged in parallel in the heat exchange channel; An air inlet unit, which is communicated with the front end of the heat exchange tube group and is internally provided with water distribution nozzles; the water mist sprayed by the water distribution nozzles enters the heat exchange tube group along with the air flow and evaporates into gas in the heat exchange tube group, so that the water vapor in the air flow reaches saturation; A screening and preheating tube group, which is arranged on the side of the aggregate screening equipment and is communicated with the rear end of the heat exchange tube group; A preheating fan, which is arranged on the back of the screening and preheating tube group and drives the air flow to flow through the screening and preheating tube group and blow towards the aggregates on the aggregate screening equipment; A dust collection hood, which is arranged on the top of the aggregate screening equipment and is suitable for collecting the dust-containing gas generated by the aggregate screening equipment; A cyclone separator, with heat dissipation fins arranged on the outer wall, and the inlet is respectively communicated with the dust collection hood and the rear end of the screening and preheating tube group; The screening and preheating tube group includes a plurality of preheating tubes, and each of the preheating tubes undulates up and down; The screening and preheating tube group further includes a water collecting pipe, the water collecting pipe is arranged vertically and communicates with the lower parts of each of the preheating tubes; a dust removal nozzle is arranged at the lower end of the water collecting pipe, and the dust removal nozzle faces directly below the aggregate screening equipment and is suitable for spraying water mist to moisten the impurities screened out by the aggregate screening equipment.

2. The ventilation structure of the asphalt concrete processing workshop according to claim 1, characterized in that, The lower end of the water collecting pipe is connected to the dust removal nozzle through a one-way valve, and the conduction direction of the one-way valve is from the water collecting pipe to the dust removal nozzle; the dust removal nozzle is also connected to a high-pressure water supply pipe; When there is accumulated water in the water collecting pipe, the sum of the gravity of the accumulated water and the gas pressure in the water collecting pipe is greater than the pressure of the high-pressure water supply pipe, and the water collecting pipe is conducted with the dust removal nozzle through the one-way valve; When all or part of the accumulated water in the water collecting pipe is discharged, the gas pressure in the water collecting pipe is less than the pressure of the high-pressure water supply pipe, and the one-way valve blocks the water collecting pipe and the dust removal nozzle.

3. The ventilation structure of the asphalt concrete processing workshop according to claim 1, characterized in that, The two side edges of the screen of the aggregate screening equipment are bent upwards, and the two groups of screening and preheating tube groups are respectively located outside the two side edges of the screen and are inclined towards the middle of the screen.

4. The ventilation structure of the asphalt concrete processing workshop according to claim 1, characterized in that, The aggregate screening equipment includes at least two stages of screening units arranged in sequence, and the screening and preheating tube group is located on the side of the screening unit after the first stage.

5. The ventilation structure of the asphalt concrete processing workshop according to claim 1, wherein, An isolation net is arranged in the preheating tube, the isolation net is close to the lower wall of the preheating tube and divides the inner cavity of the preheating tube into an upper air flow channel and a lower water flow channel, and the upper end of the mesh hole of the isolation net is inclined backwards.

6. The ventilation structure of the asphalt concrete processing workshop according to claim 1, wherein, According to the flow rate and dust content rate of the dust-containing gas flowing from the dust collection hood into the cyclone separator, control the rotation speed of the preheating fan, and further control the water content of the air flow flowing from the screening and preheating tube group into the cyclone separator.

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