Intelligent exhaust device of a thermal regeneration combined device

Abstract

The utility model relates to the technical field of asphalt mixture heat regeneration, provide a kind of heat regeneration combined equipment intelligent exhaust device and method, including regeneration cloth bag dust catcher, primary cloth bag dust catcher, primary air fan, regeneration air fan, heat exchange water filter and mixing box;The output end of regeneration cloth bag dust catcher is connected with the shell side import of heat exchange water filter by regeneration air fan, and the shell side export of heat exchange water filter is connected with mixing box;The output end of primary cloth bag dust catcher is connected with mixing box by primary air fan, and the tube side export of heat exchange water filter is connected with the input end of primary air fan, and the tube side import of heat exchange water filter is connected with external air.The utility model has the advantages that: both can ensure that the asphalt smoke concentration value discharged is lower than standard value, and can reduce cost and reduce energy waste.

Description

[Technical Field]

[0001] This utility model relates to the field of hot recycling technology for asphalt mixtures, and in particular to an intelligent exhaust device for a hot recycling combined equipment. [Background Technology]

[0002] Thermal recycling of asphalt mixtures is a technology for recycling and reusing asphalt mixtures, and it is one of the most widely used recycling technologies. There are two heating methods in thermal recycling: counter-current heating and co-current heating. The treatment methods for the recycled exhaust gas produced by these two methods also differ. Co-current heating produces exhaust gas at a higher temperature. The typical treatment method is to send the exhaust gas through an induced draft fan into the primary drying drum for secondary combustion to remove the asphalt fumes. Then, the exhaust gas is mixed with the exhaust gas produced by the primary equipment and filtered through a primary bag filter to remove dust particles before being released into the atmosphere. However, this method has limitations. The total amount of recycled gas allowed for secondary combustion is restricted by factors such as the primary drum and pipelines, often only processing a small portion or a small volume of recycled exhaust gas, thus affecting the output of the recycling equipment and limiting the proportion of recycled material that can be added.

[0003] The exhaust gas generated by counter-current heating has a low temperature. The usual method for treating this exhaust gas is to first inject a certain amount of powder particles into the regeneration flue pipe to coat the asphalt fumes in the regeneration exhaust gas, and then directly send it to a bag filter to remove the dust particles before discharging it from the equipment. This method avoids the problem of limited production capacity caused by introducing a primary drum for secondary combustion. However, the powder coating method cannot completely remove the asphalt fumes from the regeneration exhaust gas. If the amount of powder coating is not properly controlled, the concentration of asphalt fumes in the exhaust gas discharged from the equipment can easily exceed the standard. Therefore, the exhaust gas discharged from the equipment usually needs to be burned in a regeneration exhaust gas incinerator to remove the asphalt fumes before being released into the atmosphere. The problems with this method are high equipment investment, high operating costs, and high exhaust gas emission temperature after incineration, resulting in energy waste. Therefore, there is an urgent need for an intelligent exhaust device and method that can control the concentration of regeneration exhaust gas emissions below the standard value while reducing costs and energy waste. [Utility Model Content]

[0004] In view of the above-mentioned technical problems, the purpose of this utility model is to provide an intelligent exhaust device for thermal regeneration combined equipment, which can control the concentration of regeneration exhaust gas emissions below the standard value, and reduce costs and energy waste.

[0005] This utility model is implemented as follows: an intelligent exhaust device for a thermal regeneration combined equipment, comprising a regenerated bag filter, a primary bag filter, a primary induced draft fan, a regenerated induced draft fan, a heat exchange water filter, and a mixing chamber;

[0006] The output end of the regenerated bag filter is connected to the shell-side inlet of the heat exchange water filter via a regenerated induced draft fan, and the shell-side outlet of the heat exchange water filter is connected to the mixing chamber; the output end of the virgin bag filter is connected to the mixing chamber via a virgin induced draft fan, the tube-side outlet of the heat exchange water filter is connected to the input end of the virgin induced draft fan, and the tube-side inlet of the heat exchange water filter is connected to the outside air.

[0007] Furthermore, it also includes an asphalt fume analyzer; the top of the mixing chamber is provided with an exhaust outlet, and the asphalt fume analyzer is installed on the exhaust outlet.

[0008] Furthermore, it also includes an electrically adjustable damper; the tube outlet of the heat exchange filter is connected to the input end of the original induced draft fan through a first connecting pipe, and the electrically adjustable damper is installed on the first connecting pipe.

[0009] Furthermore, it also includes a counter-current regeneration drying drum, a return air fan, a hot air furnace, and a second connecting pipe; the feed end of the counter-current regeneration drying drum is provided with a first exhaust gas chamber, and the discharge end of the counter-current regeneration drying drum is provided with a first discharge box.

[0010] The output end of the regenerated bag filter is also connected to the hot air furnace via a return air fan. The hot air furnace is connected to the first discharge box. The first exhaust gas chamber is connected to the input end of the regenerated bag filter via a second connecting pipe.

[0011] Furthermore, it also includes a powder spraying device and a powder hopper; the input end of the powder spraying device is connected to the bottom of the powder hopper, and the output end of the powder spraying device is connected to the second connecting pipe.

[0012] Furthermore, the mixing chamber is divided into a first space and a second space by a set of guide vanes. Both the primary exhaust fan and the regenerated exhaust fan are connected to the first space, and the exhaust outlet is connected to the second space.

[0013] Furthermore, the lower end of the heat exchange filter is provided with a first drain outlet that communicates with the shell side of the heat exchange filter; the lower end of the mixing tank has a funnel-shaped structure, and a second drain outlet is provided in the middle of the bottom of the mixing tank.

[0014] Furthermore, it also includes a counter-current primary drying drum and a third connecting pipe; the feed end of the counter-current primary drying drum is provided with a second exhaust chamber, and the discharge end of the counter-current primary drying drum is provided with a second discharge box; the second exhaust chamber is connected to the primary exhaust fan through the third connecting pipe.

[0015] By adopting the above-mentioned technical solution of this utility model, it is possible to effectively ensure that the concentration of emitted asphalt fumes is lower than the standard value, and to reduce costs and energy waste.

[0016] 1. A portion of the regenerated exhaust gas after dust removal and filtration by the regenerated bag filter is drawn into the shell side of the heat exchange water filter by a regenerated induced draft fan for heat exchange. The condensate and asphalt liquid in the regenerated exhaust gas can be separated by heat exchange in the shell side of the heat exchange water filter, so that only a small amount of asphalt fumes remain in the regenerated exhaust gas entering the mixing box, which helps to reduce the concentration of discharged asphalt fumes. At the same time, the heat energy of the regenerated exhaust gas can be directly used for heat exchange, which can reduce energy waste.

[0017] 2. The regenerated exhaust gas after heat exchange, the fresh air from outside, and the original exhaust gas after dust removal and filtration are transported together into the mixing chamber for mixing. This can fully dilute the asphalt fumes in the regenerated exhaust gas, thereby effectively reducing the concentration of asphalt fumes in the mixed exhaust gas.

[0018] 3. An asphalt fume meter is installed at the exhaust outlet of the mixing chamber, and an electrically adjustable damper is installed on the first connecting pipe between the outlet of the heat exchange filter and the input of the primary induced draft fan. This allows for intelligent control of the primary induced draft fan speed and the size of the electrically adjustable damper based on the asphalt fume concentration detected by the asphalt fume meter during operation. When the asphalt fume concentration detected by the meter exceeds a set value, the speed of the primary induced draft fan is automatically increased and the electrically adjustable damper is widened to increase the air supply. This not only further reduces the temperature of the regenerated exhaust gas and enhances the condensation effect of the heat exchange filter on the regenerated exhaust gas, reducing the amount of residual asphalt fume entering the mixing chamber, but also increases the amount of fresh external air entering the mixing chamber, reducing the proportion of residual asphalt fume per unit volume. This effectively reduces the asphalt fume concentration in the mixed exhaust gas, ensuring that the discharged asphalt fume concentration is below the standard value. In addition, the native exhaust fan can provide power for both drawing in fresh outside air and drawing in native exhaust gas, which can effectively improve the utilization rate of the native exhaust fan and reduce the cost of use.

[0019] 4. The other part of the regenerated exhaust gas filtered by the regenerated bag filter is drawn into the hot air furnace by the return air fan for secondary combustion to burn off the asphalt fumes in this part of the regenerated exhaust gas. This can reduce the amount of regenerated exhaust gas entering the heat exchange water filter, and further effectively reduce the amount of asphalt fumes remaining in the regenerated exhaust gas in the mixing box. At the same time, the regenerated exhaust gas entering the hot air furnace can also cool the hot air furnace and prevent the temperature inside the hot air furnace from becoming too high.

[0020] 5. By using guide vane assemblies to divide the mixing chamber into a first space and a second space, and connecting both the primary exhaust fan and the regenerated exhaust fan to the first space, and connecting the exhaust outlet to the second space, the guide vane assemblies can turbulently flow through the regenerated exhaust gas, external fresh air, and primary exhaust gas entering the mixing chamber. This increases the residence time of the regenerated exhaust gas, external fresh air, and primary exhaust gas within the mixing chamber, thereby improving the mixing rate and mixing effect. In addition, the guide vane assemblies can also block residual condensate and asphalt liquid in the regenerated exhaust gas. [Attached Image Description]

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a structural diagram of the intelligent exhaust device for a combined heat regeneration equipment according to this utility model.

[0023] Figure 2 This is an assembly structure diagram of the regenerated bag filter, the original bag filter, the original induced draft fan, the regenerated induced draft fan, the heat exchange water filter, the mixing box and the counter-current regenerated drying drum in this utility model.

[0024] Figure 3 This is a structural diagram showing the connection between the heat exchange filter and the mixing tank in this utility model.

[0025] Figure 4 This is a structural diagram of the original part of the device in this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] Intelligent exhaust device 100;

[0028] Regenerated bag filter dust collector 1;

[0029] Original bag filter dust collector 2;

[0030] Native exhaust fan 3;

[0031] Regenerated induced draft fan 4;

[0032] Heat exchange filter 5, first connecting pipe 51, first drain outlet 52;

[0033] Mixing box 6, exhaust outlet 61, guide vane assembly 62, buffer plate 621, first space 63, second space 64, second drain outlet 65;

[0034] Asphalt fume analyzer 71, electric adjustable damper 72;

[0035] Counter-current regenerated drying drum 81, first exhaust chamber 811, first discharge box 812, return air fan 82, hot air furnace 83, second connecting pipe 84, recycled material temporary storage bin 85, recycled material collection bin 86, recycled material belt conveyor 87, recycled material elevator 88, recycled material chute 881.

[0036] Powder spraying device 91, powder hopper 92, counter-current primary drying drum 93, third connecting pipe 94;

[0037] 101 raw material silo, 102 raw material belt conveyor, 103 raw material elevator, 104 raw hot material silo, 105 raw aggregate scale, 106 recycled aggregate scale, 107 mixing tank, 108 asphalt tank, 1081 asphalt scale, 109 mineral powder silo, 1091 mineral powder scale.

Detailed Implementation Methods

[0038] To better understand the technical solution of this utility model, the technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] It should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing these embodiments and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0040] Please see Figures 1 to 4 As shown, this utility model discloses an intelligent exhaust device 100 for a thermal regeneration combined equipment. The intelligent exhaust device 100 includes a regeneration bag filter 1, a primary bag filter 2, a primary exhaust fan 3, a regeneration exhaust fan 4, a heat exchange water filter 5, and a mixing chamber 6. The regeneration bag filter 1 is used to filter and treat the regeneration exhaust gas. The primary bag filter 2 is used to filter and treat the primary exhaust gas. The primary exhaust fan 3 is used to draw the primary exhaust gas filtered by the primary bag filter 2 into the mixing chamber 6. The regeneration exhaust fan 4 is used to draw the regeneration exhaust gas filtered by the regeneration bag filter 1 into the heat exchange water filter 5 for heat exchange. The heat exchange water filter 5 is used to exchange heat between the regeneration exhaust gas and the outside air. The mixing chamber 6 is used to mix the regeneration exhaust gas, the primary exhaust gas, and the outside air before discharging.

[0041] The output end of the regenerated bag filter 1 is connected to the shell-side inlet of the heat exchange water filter 5 via the regenerated induced draft fan 4, so that the regenerated exhaust gas filtered by the regenerated bag filter 1 is drawn into the shell side of the heat exchange water filter 5. The shell-side outlet of the heat exchange water filter 5 is connected to the mixing chamber 6, so that the regenerated exhaust gas after heat exchange is input into the mixing chamber 6. The output end of the original bag filter 2 is connected to the mixing chamber 6 via the original induced draft fan 3. The tube-side outlet of the heat exchange water filter 5 is connected to the input end of the original induced draft fan 3, and the tube-side inlet of the heat exchange water filter 5 is connected to the outside air. This allows the original induced draft fan 3 to draw the original exhaust gas filtered by the original bag filter 2 into the mixing chamber 6, and also to draw in fresh outside air into the tube side of the heat exchange water filter 5 for heat exchange. At the same time, the fresh outside air after heat exchange can enter the mixing chamber 6 along with the original exhaust gas.

[0042] In some embodiments of this utility model, the intelligent exhaust device 100 further includes an asphalt fume analyzer 71; the top of the mixing chamber 6 is provided with a tail gas outlet 61, and the asphalt fume analyzer 71 is installed on the tail gas outlet 61. During operation, the intelligent exhaust device can use the asphalt fume analyzer 71 to detect the concentration of asphalt fumes in the mixed tail gas discharged from the mixing chamber 6 in real time, so that corresponding measures can be taken when the asphalt fumes concentration exceeds the standard, thereby ensuring that the discharged asphalt fumes concentration is lower than the specified standard value.

[0043] In some embodiments of this utility model, the intelligent exhaust device 100 further includes an electrically adjustable damper 72; the tube outlet of the heat exchange water filter 5 is connected to the input end of the original induced draft fan 3 through a first connecting pipe 51, and the electrically adjustable damper 72 is installed on the first connecting pipe 51. During operation, the amount of air input into the mixing chamber 6 can be adjusted by the electrically adjustable damper 72.

[0044] In some embodiments of this utility model, the intelligent exhaust device 100 further includes a counter-current regeneration drying drum 81, a return air fan 82, a hot air furnace 83, and a second connecting pipe 84; the feed end of the counter-current regeneration drying drum 81 is provided with a first exhaust chamber 811, and the discharge end of the counter-current regeneration drying drum 81 is provided with a first discharge box 812.

[0045] The output end of the regenerated bag filter 1 is also connected to the hot air furnace 83 through the return air fan 82, so that a portion of the regenerated exhaust gas filtered by the regenerated bag filter 1 can be drawn into the hot air furnace 83 for secondary combustion. The hot air furnace 83 is connected to the first discharge box 812, and the first exhaust gas chamber 811 is connected to the input end of the regenerated bag filter 1 through the second connecting pipe 84, so that the regenerated exhaust gas generated by the counter-current regenerated drying drum 81 during operation can be transported to the regenerated bag filter 1 through the second connecting pipe 84 for dust removal and filtration.

[0046] In a specific implementation of this invention, the intelligent exhaust device 100 further includes a recycled material collection bin 86, a recycled material belt conveyor 87, a recycled material elevator 88, and a recycled material temporary storage bin 85. Multiple recycled material collection bins 86 are arranged above the recycled material belt conveyor 87. The output end of the recycled material belt conveyor 87 is connected to the input end of the recycled material elevator 88. The output end of the recycled material elevator 88 is connected to the feed end of the counter-current recycled drying drum 81 via a recycled material chute 881. The recycled material temporary storage bin 85 is connected to the first discharge box 812. In actual operation, the recycled material stored in the recycled material collection bin 86 is conveyed to the recycled material belt conveyor 87, which then conveys the recycled material to the recycled material elevator 88. The recycled material elevator 88 lifts the recycled material and conveys it into the counter-current recycled drying drum 81 for heating and drying. After heating and drying, the recycled material is conveyed to the recycled material temporary storage bin 85 for temporary storage.

[0047] By adopting the above-mentioned technical solution of this utility model, it is possible to effectively ensure that the concentration of emitted asphalt fumes is lower than the standard value, and to reduce costs and energy waste. Specifically, it includes:

[0048] 1. A portion of the regenerated exhaust gas after dust removal and filtration by the regenerated bag filter 1 is drawn into the shell side of the heat exchange water filter 5 by the regenerated induced draft fan 4 for heat exchange. The condensate and asphalt liquid in the regenerated exhaust gas can be separated by heat exchange in the shell side of the heat exchange water filter 5, so that only a small amount of asphalt fumes remain in the regenerated exhaust gas entering the mixing chamber 6, which helps to reduce the concentration of discharged asphalt fumes. At the same time, the heat energy of the regenerated exhaust gas can be directly used for heat exchange, which can reduce energy waste.

[0049] 2. The regenerated exhaust gas after heat exchange, the outside fresh air, and the original exhaust gas after dust removal and filtration are transported together into the mixing chamber 6 for mixing, which can fully dilute the asphalt fumes in the regenerated exhaust gas, thereby effectively reducing the concentration of asphalt fumes in the mixed exhaust gas.

[0050] 3. An asphalt fume meter 71 is installed at the exhaust outlet 61 of the mixing chamber 6, and an electric regulating damper 72 is installed on the first connecting pipe 51 between the tube outlet of the heat exchange water filter 5 and the input end of the primary exhaust fan 3. This allows for intelligent control and adjustment of the speed of the primary exhaust fan 3 and the size of the electric regulating damper 72 based on the asphalt fume concentration detected by the asphalt fume meter 71 during operation. When the asphalt fume concentration detected by the asphalt fume meter 71 exceeds the set value, the speed of the primary exhaust fan 3 and the size of the electric regulating damper 72 are automatically increased to increase the air supply. This not only further reduces the temperature of the regenerated exhaust gas and increases the condensation effect of the heat exchange water filter 5 on the regenerated exhaust gas, reducing the amount of residual asphalt fume entering the mixing chamber 6, but also increases the amount of fresh external air entering the mixing chamber 6, reducing the proportion of residual asphalt fume per unit volume. This effectively reduces the asphalt fume concentration in the mixed exhaust gas, ensuring that the discharged asphalt fume concentration is below the standard value. In addition, the native exhaust fan 3 can provide power for both drawing in fresh outside air and drawing in native exhaust gas, which can effectively improve the utilization rate of the native exhaust fan 3 and reduce the cost of use.

[0051] 4. The return air fan 82 draws another portion of the regenerated exhaust gas filtered by the regenerated bag filter 1 into the hot air furnace 83 for secondary combustion to burn off the asphalt fumes in this portion of the regenerated exhaust gas. This reduces the amount of regenerated exhaust gas entering the heat exchange water filter 5, and further effectively reduces the amount of asphalt fumes remaining in the regenerated exhaust gas in the mixing box 6. At the same time, the regenerated exhaust gas entering the hot air furnace 83 can also cool the hot air furnace 83, preventing the temperature inside the hot air furnace 83 from becoming too high.

[0052] In some embodiments of this utility model, the intelligent exhaust device 100 further includes a powder spraying device 91 and a powder hopper 92; the input end of the powder spraying device 91 is connected to the bottom of the powder hopper 92, and the output end of the powder spraying device 91 is connected to the second connecting pipe 84, so that in specific operation, the powder spraying device 91 can be used to spray powder into the second connecting pipe 84, so that the asphalt fumes in the regenerated exhaust gas are coated by the powder particles, and then the dust particles coated with the asphalt fumes are filtered out by the regenerated bag dust collector 1.

[0053] To effectively reduce the final concentration of asphalt fumes emitted, this invention employs the following measures: First, a powder spraying device 91 is used to spray powder onto the regenerated exhaust gas output from the counter-current regenerated drying drum 81; second, a regenerated bag filter 1 is used to filter the dust particles coated with asphalt fumes; third, a portion of the regenerated exhaust gas filtered by the bag filter 1 is returned to the hot air furnace 83 of the counter-current regenerated drying drum 81 for secondary combustion; fourth, another portion of the regenerated exhaust gas filtered by the bag filter 1 is sent to a heat exchange water filter 5 for heat exchange, thereby removing condensate and asphalt liquid from the exhaust gas; fifth, the heat-exchanged regenerated exhaust gas is sent to a mixing chamber 6 to mix and dilute with fresh external air and virgin exhaust gas that participated in the heat exchange. Through the combined effect of these five measures, it can be effectively ensured that the final concentration of emitted asphalt fumes is lower than the prescribed standard value.

[0054] In some embodiments of this utility model, the mixing chamber 6 is divided into a first space 63 and a second space 64 by a guide vane assembly 62. Both the primary exhaust fan 3 and the regenerative exhaust fan 4 are connected to the first space 63, and the exhaust outlet 61 is connected to the second space 64. As a specific embodiment of this utility model, the guide vane assembly 62 includes several buffer plates 621 arranged obliquely from top to bottom in the middle of the mixing chamber 6 along the vertical direction, with the end of each buffer plate 621 facing the first space 63 being higher than the end facing the second space 64.

[0055] This invention utilizes guide vane assembly 62 to divide the mixing chamber 6 into a first space 63 and a second space 64, connecting both the primary exhaust fan 3 and the regeneration exhaust fan 4 to the first space 63 and the exhaust outlet 61 to the second space 64. This allows the guide vane assembly 62 to turbulently flow through the regeneration exhaust gas, external fresh air, and primary exhaust gas entering the mixing chamber 6, increasing their residence time within the mixing chamber 6. This, in turn, improves the mixing rate and effect of the regeneration exhaust gas, external fresh air, and primary exhaust gas. Furthermore, the guide vane assembly 62 can also block residual condensate and asphalt liquid in the regeneration exhaust gas.

[0056] In some embodiments of this utility model, the lower end of the heat exchange filter 5 is provided with a first drain port 52 connected to the shell side of the heat exchange filter 5, so as to discharge the condensate and asphalt liquid precipitated in the shell side of the heat exchange filter 5. The lower end of the mixing tank 6 is funnel-shaped, and a second drain port 65 is provided in the middle of the bottom of the mixing tank 6. In actual operation, when the regenerated exhaust gas, external fresh air and original exhaust gas pass through the guide vane assembly 62, the condensate and asphalt liquid remaining in the regenerated exhaust gas will adhere to the guide vane assembly 62, and as the liquid particles continue to grow larger, they will eventually fall to the bottom of the mixing tank 6 under the action of gravity. Therefore, this utility model, by designing the lower end of the mixing tank 6 to be funnel-shaped and providing a second drain port 65 in the middle of the bottom of the mixing tank 6, can use the second drain port 65 to discharge the condensate and asphalt liquid that fall to the bottom of the mixing tank 6.

[0057] In some embodiments of this utility model, the intelligent exhaust device 100 further includes a counter-current primary drying drum 93 and a third connecting pipe 94; the feed end of the counter-current primary drying drum 93 is provided with a second exhaust chamber 931, and the discharge end of the counter-current primary drying drum 93 is provided with a second discharge box 932; the second exhaust chamber 931 is connected to the primary exhaust fan 3 through the third connecting pipe 94, so that the primary exhaust fan 3 can draw the primary exhaust gas generated by the operation of the counter-current primary drying drum 93 into the mixing box 6.

[0058] In a specific implementation of this utility model, the intelligent exhaust device 100 further includes a raw material silo 101, a raw material belt conveyor 102, a raw material elevator 103, a raw hot material silo 104, a raw aggregate scale 105, a recycled aggregate scale 106, a mixing cylinder 107, an asphalt tank 108, and a mineral powder silo 109; wherein:

[0059] Above the raw material belt conveyor 102, multiple raw material bins 101 are arranged. The output end of the raw material belt conveyor 102 is connected to the inlet end of the counter-current raw material drying drum 93, the outlet end of the counter-current raw material drying drum 93 is connected to the input end of the raw material elevator 103, and the output end of the raw material elevator 103 is connected to the raw material hot material bin 104. The raw aggregate scale 105 is located at the output end of the raw material hot material bin 104, and the recycled aggregate scale 106 is located at the output end of the recycled material temporary storage bin 85. The output end of the asphalt tank 108 is equipped with an asphalt scale 1081, and the output end of the mineral powder bin 109 is equipped with a mineral powder scale 1091. The output ends of the raw aggregate scale 105, recycled aggregate scale 106, asphalt scale 1081, and mineral powder scale 1091 are all connected to the mixing tank 107. In practical operation, the present invention conveys raw materials to a raw material belt conveyor 102 via a raw material silo 101. The raw material belt conveyor 102 then conveys the raw materials to a counter-current raw material drying drum 93 for heating and drying. After heating and drying, the raw materials are lifted by a raw material elevator 103 and output to a raw material hot material silo 104 for storage. When it is necessary to mix asphalt mixture, the required raw aggregate is weighed using a raw aggregate scale 105 and fed into a mixing cylinder 107, the required recycled aggregate is weighed using a recycled aggregate scale 106 and fed into a mixing cylinder 107, the required asphalt is weighed using an asphalt scale 1081 and fed into a mixing cylinder 107, and the required mineral powder is weighed using a mineral powder scale 1091 and fed into a mixing cylinder 107. The recycled aggregate, raw aggregate, asphalt, and mineral powder are then mixed in the mixing cylinder 107.

[0060] This utility model discloses an exhaust method for an intelligent exhaust device 100 in a thermal regeneration combined equipment; the method includes the following steps:

[0061] The regenerated exhaust gas filtered by the regenerated bag filter 1 is transported to the shell side of the heat exchange water filter 5 by the regenerated exhaust gas 4, so that the regenerated exhaust gas can be heat exchanged in the heat exchange water filter 5. The original exhaust gas filtered by the original bag filter 2 is transported to the mixing box 6 by the original exhaust gas 3. At the same time, the original exhaust gas 3 draws outside air into the tube side of the heat exchange water filter 5 and exchanges heat with the regenerated exhaust gas in the shell side of the heat exchange water filter 5, so that condensate and asphalt liquid are released from the regenerated exhaust gas. Since the temperature of the outside air is relatively low and the temperature of the regenerated exhaust gas is relatively high, the temperature of the outside air will increase during the heat exchange process, while the temperature of the regenerated exhaust gas will decrease, so that condensate and asphalt liquid can be released.

[0062] The heat-exchanged outside air and the original exhaust gas are transported together into the mixing chamber 6, and the heat-exchanged regenerated exhaust gas is also transported into the mixing chamber 6. The outside air, the original exhaust gas and the regenerated exhaust gas are mixed and diluted in the mixing chamber 6 before being discharged, so as to effectively reduce the concentration of asphalt fumes in the mixed exhaust gas.

[0063] The method further includes the following steps:

[0064] The return air fan 82 is used to send a portion of the regenerated exhaust gas output from the regenerated bag filter 1 back to the hot air furnace 83 of the counter-current regenerated drying drum 81 for secondary combustion, so as to remove the asphalt fumes in this portion of the regenerated exhaust gas, and at the same time reduce the amount of regenerated exhaust gas entering the heat exchange water filter 5, thereby helping to further reduce the concentration of asphalt fumes in the mixed exhaust gas.

[0065] The asphalt fume meter 71 detects the asphalt fume concentration of the mixed exhaust gas discharged from the mixing chamber 6 in real time, and automatically adjusts the speed of the primary exhaust fan 3 and the size of the electric regulating damper 72 based on the detected asphalt fume concentration. Specifically, when the asphalt fume concentration detected by the asphalt fume meter 71 is greater than the set value, it automatically controls to increase the speed of the primary exhaust fan 3 and widen the electric regulating damper 72 to increase the air supply. This not only further reduces the temperature of the regenerated exhaust gas and increases the condensation effect of the heat exchange filter 5 on the regenerated exhaust gas, reducing the amount of residual asphalt fume entering the mixing chamber 6, but also increases the amount of fresh external air entering the mixing chamber 6, reducing the proportion of residual asphalt fume per unit volume, thereby effectively reducing the asphalt fume concentration in the mixed exhaust gas and ensuring that the discharged asphalt fume concentration is lower than the standard value. At the same time, when the asphalt fume concentration detected by the asphalt fume meter 71 is less than the set value, it can also automatically control to appropriately reduce the speed of the primary exhaust fan 3 and narrow the electric regulating damper 72.

[0066] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An intelligent exhaust device for a thermal regeneration combined equipment, characterized in that: It includes a recycled bag filter, a virgin bag filter, a virgin induced draft fan, a recycled induced draft fan, a heat exchange water filter, and a mixing chamber; The output end of the regenerated bag filter is connected to the shell-side inlet of the heat exchange water filter via a regenerated induced draft fan, and the shell-side outlet of the heat exchange water filter is connected to the mixing chamber; the output end of the virgin bag filter is connected to the mixing chamber via a virgin induced draft fan, the tube-side outlet of the heat exchange water filter is connected to the input end of the virgin induced draft fan, and the tube-side inlet of the heat exchange water filter is connected to the outside air. The top of the mixing chamber is provided with an exhaust outlet. The mixing chamber is divided into a first space and a second space by a guide vane assembly. The primary exhaust fan and the regenerated exhaust fan are both connected to the first space, and the exhaust outlet is connected to the second space. The guide vane assembly includes several buffer plates that are inclined from top to bottom in the middle of the mixing chamber along the vertical direction, and the end of each buffer plate facing the first space is higher than the end facing the second space.

2. The intelligent exhaust device for a thermal regeneration combined equipment as described in claim 1, characterized in that: It also includes an asphalt fume analyzer; the asphalt fume analyzer is installed at the exhaust outlet.

3. The intelligent exhaust device for a thermal regeneration combined equipment as described in claim 2, characterized in that: It also includes an electrically adjustable damper; the tube outlet of the heat exchange filter is connected to the input end of the original induced draft fan through a first connecting pipe, and the electrically adjustable damper is installed on the first connecting pipe.

4. The intelligent exhaust device for a thermal regeneration combined equipment as described in any one of claims 1-3, characterized in that: It also includes a counter-current regeneration drying drum, a return air fan, a hot air furnace, and a second connecting pipe; the feed end of the counter-current regeneration drying drum is provided with a first exhaust gas chamber, and the discharge end of the counter-current regeneration drying drum is provided with a first discharge box. The output end of the regenerated bag filter is also connected to the hot air furnace via a return air fan. The hot air furnace is connected to the first discharge box. The first exhaust gas chamber is connected to the input end of the regenerated bag filter via a second connecting pipe.

5. The intelligent exhaust device for a thermal regeneration combined equipment as described in claim 4, characterized in that: It also includes a powder spraying device and a powder hopper; the input end of the powder spraying device is connected to the bottom of the powder hopper, and the output end of the powder spraying device is connected to the second connecting pipe.

6. The intelligent exhaust device for a thermal regeneration combined equipment as described in claim 1, characterized in that: The lower end of the heat exchange filter is provided with a first drain outlet that is connected to the shell side of the heat exchange filter; the lower end of the mixing tank is funnel-shaped, and a second drain outlet is provided in the middle of the bottom of the mixing tank.

7. The intelligent exhaust device for a thermal regeneration combined equipment as described in claim 1, characterized in that: It also includes a counter-current primary drying drum and a third connecting pipe; the feed end of the counter-current primary drying drum is provided with a second exhaust chamber, and the discharge end of the counter-current primary drying drum is provided with a second discharge box; the second exhaust chamber is connected to the primary exhaust fan through the third connecting pipe.

Images