Flue gas purification device for waste asphalt regeneration

Abstract

The invention discloses a flue gas purification device for waste asphalt regeneration, and relates to the technical field of flue gas purification, the flue gas purification device comprises a purification cylinder for providing a flue gas purification cavity, a bag turning assembly arranged in the purification cylinder, a power transmission mechanism for driving the bag turning assembly to move, and a purification cloth bag with two ends fixedly connected with the bag turning assembly respectively. The cleaning mode that the first bag turning frame and the second bag turning frame reversely move to drive the purification cloth bag to turn over is adopted, a traditional high-voltage pulse reverse blowing structure is thoroughly abandoned, the cloth bag can be cleaned only by driving the lead screw and the guide transmission mechanism through the motor, a large amount of energy does not need to be consumed for preparing and conveying high-voltage pulse gas, and the cleaning efficiency is improved. The operation cost of waste asphalt regeneration flue gas treatment is greatly reduced, the green and energy-saving development requirements are met, and meanwhile tensile damage to cloth bag fibers caused by instantaneous impact force of high-pressure pulse gas is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas purification, in particular to a flue gas purification device for waste asphalt regeneration. BACKGROUND

[0002] In the field of road engineering, the recycling of waste asphalt mixture is a key technical means to realize resource recycling, reduce engineering cost and reduce environmental pollution. One of the core processes of waste asphalt mixture regeneration is to heat and melt the waste asphalt mixture to restore its adhesive properties, and then mix it with new aggregates, new asphalt and other components to prepare regenerated asphalt mixture that meets engineering requirements.

[0003] However, during the heating and melting process of waste asphalt, the asphaltene, gum and a small amount of impurities contained in the waste asphalt will undergo thermal decomposition and volatilization, producing harmful flue gas containing dust particles, polycyclic aromatic hydrocarbons and other harmful substances. If this flue gas is not effectively treated and directly discharged, it will not only seriously pollute the surrounding atmospheric environment, but also pose a great threat to the health of the operators.

[0004] To solve the above problems, the existing technology generally uses a bag dust removal structure to pretreat the flue gas generated during the melting of waste asphalt. The core principle is to use the filter layer of the bag to trap large particles of dust in the flue gas, and then use subsequent activated carbon adsorption, photocatalytic degradation and other processes to deeply purify the harmful substances in the flue gas. However, in actual application, the existing bag dust removal structure has obvious technical defects: on the one hand, after a certain period of filtration, a large amount of dust particles will adhere to the surface and inside of the bag, causing the filter pores to be blocked and the filtration efficiency to drop sharply. Therefore, high-pressure pulse gas needs to be periodically blown into the bag to clean it, which consumes a large amount of energy and significantly increases the overall operating cost of waste asphalt regeneration. On the other hand, the instantaneous impact force of the high-pressure pulse gas during the blowback process is strong, which can easily cause the stretching and damage of the fiber structure of the bag, thereby shortening the service life of the bag, increasing the equipment maintenance cost, and also causing dust leakage due to bag damage, which reduces the purification effect of the entire flue gas treatment system. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a flue gas purification device for waste asphalt regeneration to solve the technical problems raised in the background.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a flue gas purification device for waste asphalt regeneration, comprising a purification cylinder for providing a flue gas purification cavity, a bag turning assembly arranged in the purification cylinder, a power transmission mechanism for driving the bag turning assembly to move, and a purification bag having two ends fixedly connected with the bag turning assembly.

[0007] The bag turning assembly comprises a first bag turning frame and a second bag turning frame with different diameters, and the purification cloth bag has a trapezoidal cross section adapted to the bag turning action;

[0008] The first bag turning frame has a smaller diameter than the second bag turning frame, one end of the purification cloth bag is fixed to the outer wall of the first bag turning frame, and the other end is fixed to the inner wall of the second bag turning frame;

[0009] The first bag turning frame is provided with a connecting pipe at one side of the bottom, the purification cylinder is fixed with a blocking plate at the top, and when the first bag turning frame is in the top state, the blocking plate plays a closing role on the connecting pipe;

[0010] After the first bag turning frame is lowered, the connecting pipe is connected with the top of the air inlet pipe, so that the filtered flue gas enters the inside of the purification cloth bag, the air inlet pipe is correspondingly arranged with the inside cavity of the purification cloth bag, and the exhaust pipe is correspondingly arranged with the cavity between the inner wall of the purification cylinder and the purification cloth bag;

[0011] The purification cloth bag is made of a composite fiber material of polytetrafluoroethylene or glass fiber, which has the characteristics of high temperature resistance, wear resistance and fatigue resistance;

[0012] The power transmission mechanism comprises a motor, a lead screw and a guide transmission mechanism, the motor drives the first bag turning frame to move axially through the lead screw, and the guide transmission mechanism drives the second bag turning frame to move reversely through the transmission rope, so as to drive the purification cloth bag to turn over, realize the falling of impurities and switch the filtering surface;

[0013] The guide transmission mechanism comprises a guide shell, the transmission rope is arranged in the guide shell, and a first connecting block connected with the first bag turning frame and a second connecting block connected with the second bag turning frame are fixed on the transmission rope;

[0014] The vertical part of the guide shell near the lead screw penetrates the first bag turning frame, and plays a guiding role when the first bag turning frame moves;

[0015] The purification cylinder is provided with an air inlet pipe and an exhaust pipe, which cooperate with the bag turning assembly to form an alternating switching first purification state and a second purification state, so as to realize the continuous filtration of flue gas and the cooperative self-cleaning of the cloth bag;

[0016] The top support frame and the bottom support frame play a role in supporting the movement of the lead screw, and the top support frame and the bottom support frame are both fixed with corrugated pipes between the bottom of the top support frame and the top of the first bag turning frame, and between the bottom of the first bag turning frame and the bottom support frame;

[0017] The corrugated pipes are located outside the vertical part of the lead screw and the guide transmission mechanism, and play a whole protection role;

[0018] The corrugated pipes are located outside the vertical part of the lead screw and the guide transmission mechanism, and play a whole protection role;

[0019] The purification cylinder is internally fixed with a bearing plate with a top surface flush with the top surface of the bottom support frame, and a deslagging door is arranged on one side of the purification cylinder and matched with the bearing plate;

[0020] A motor is installed at the center position of the top of the purification cylinder, and the output end of the motor is fixedly connected with the top of the lead screw through the purification cylinder and used for driving the rotation of the lead screw.

[0021] In summary, the present application mainly has the following beneficial effects:

[0022] 1、The present application innovatively adopts the reverse motion of the first and second bag turning frames to drive the cleaning of the turning surface of the purification bag, completely discards the traditional high-pressure pulse blowback structure, and only needs to drive the lead screw and the guide transmission mechanism through the motor to complete the cleaning of the bag, without the need to consume a large amount of energy to prepare and transport high-pressure pulse gas, greatly reducing the operating cost of waste asphalt regeneration flue gas treatment, meeting the green and energy-saving development needs, avoiding the tensile damage of the high-pressure pulse gas instantaneous impact force to the bag fiber, and realizing the falling of impurities through stable turning action, and the reverse impact of the flue gas on the residual impurities outside the bag is more gentle in the second purification state, effectively reducing the risk of bag damage, significantly prolonging the service life of the bag, and reducing the equipment maintenance and consumable replacement cost;

[0023] 2、The present application synchronously completes the cleaning and filter surface updating of the bag under the premise of not interrupting the flue gas treatment process through the periodic switching of the first and second purification states, avoids the decrease of the filtering efficiency caused by dust blockage, reduces dust leakage due to the decrease of the bag damage rate, ensures the continuous and stable effect of large-particle dust interception, and guarantees the purification quality of the entire flue gas treatment system;

[0024] 3、The purification bag of the present application adopts a trapezoidal cross-section design, which is suitable for the turning action and ensures the full contact of the flue gas with the filter surface, the selected high-temperature and wear-resistant composite fiber material can adapt to the high-temperature and corrosive environment of waste asphalt regeneration flue gas, and the filtering and cleaning processes are dynamically coordinated, so that the state switching can be completed without stopping, meeting the continuous production needs of industrial production;

[0025] 4. The filter bags of this invention utilize fiber materials (such as polytetrafluoroethylene, glass fiber, and other composite fibers) that possess high strength, bend resistance, and fatigue resistance. These properties allow for bending and stretching during the flipping process. During flipping, the bag only undergoes a shape change; the core filtration parameters, such as fiber pore size and retention accuracy, do not undergo irreversible changes, ensuring consistent filtration capacity before and after flipping. The filter bags employ a trapezoidal cross-section design, combined with the fixing method of the first flipping frame (small diameter) and the second flipping frame (large diameter), ensuring even force distribution throughout the bag during flipping and preventing excessive stretching or compression of localized fibers. Compared to the instantaneous impact on fibers caused by traditional high-pressure pulse backflushing, the smooth flipping action has minimal impact on the fiber structure, preventing fiber breakage, pore deformation, and other problems, fundamentally ensuring that the filtration effect remains unaffected. Attached Figure Description

[0026] Figure 1 This is a schematic diagram showing the overall cross-sectional state of the present invention;

[0027] Figure 2 This is a cross-sectional view of the first purified state of the present invention;

[0028] Figure 3 For the present invention Figure 2 Enlarged view of point A;

[0029] Figure 4 This is a cross-sectional view of the second purified state of the present invention;

[0030] Figure 5 This is a schematic diagram of the internal structure of the present invention;

[0031] Figure 6 For the present invention Figure 5 Enlarged view of point B;

[0032] Figure 7 For the present invention Figure 5 Enlarged view of point C;

[0033] Figure 8 This is a schematic diagram of the overall structure of the present invention.

[0034] In the diagram: 1. Purification cylinder; 2. First bag-flipping frame; 201. Connecting pipe; 3. Second bag-flipping frame; 4. Purification cloth bag; 5. Lead screw; 6. Guide transmission mechanism; 601. Guide shell; 602. Transmission rope; 603. First connecting block; 604. Second connecting block; 7. Air inlet pipe; 8. Exhaust pipe; 9. Sealing plate; 10. Motor; 11. Top support frame; 12. Bottom support frame; 13. Corrugated pipe; 14. Receiving plate. Detailed Implementation

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0036] The embodiments of the present application will be described below according to the overall structure of the present application.

[0037] Embodiment

[0038] As shown in the drawings, the present embodiment discloses a flue gas purification device for waste asphalt regeneration, and the specific structure is as follows: Figures 1-8 The device comprises a purification cylinder 1, and a top support frame 11 and a bottom support frame 12 are fixed to the inside top end and the inside bottom end of the purification cylinder 1 respectively, and the top support frame 11 and the bottom support frame 12 jointly play a role of movably supporting a lead screw 5; a motor 10 is installed at the top center position of the purification cylinder 1, and the output end of the motor 10 penetrates through the purification cylinder 1 and is fixedly connected with the top of the lead screw 5, for driving the lead screw 5 to rotate;

[0039] A bag turning assembly is arranged in the purification cylinder 1, and the bag turning assembly comprises a first bag turning frame 2 and a second bag turning frame 3, the diameter of the first bag turning frame 2 is smaller than the diameter of the second bag turning frame 3, and a purification cloth bag 4 is fixedly connected between the first bag turning frame 2 and the second bag turning frame 3, the purification cloth bag 4 is made of a composite fiber material of polytetrafluoroethylene or glass fiber, has the characteristics of high temperature resistance, wear resistance and fatigue resistance, and has a trapezoidal cross section, which is suitable for bag turning action;

[0040] A connecting pipe 201 is arranged at the bottom of one side of the first bag turning frame 2, and a blocking plate 9 is fixed to the top of the purification cylinder 1; when the first bag turning frame 2 is in a top state, the blocking plate 9 can close the connecting pipe 201, so that the flue gas discharged from the top of the air inlet pipe 7 can directly enter the inside cavity of the purification cloth bag 4; after the first bag turning frame 2 is lowered, the connecting pipe 201 is connected with the top of the air inlet pipe 7, so that the flue gas to be filtered enters the inside of the purification cloth bag 4;

[0041] Three groups of guide transmission mechanisms 6 are further arranged in the purification cylinder 1, and the three groups of guide transmission mechanisms 6 are uniformly distributed along the circumferential direction of the purification cylinder 1; the guide transmission mechanism 6 comprises a guide shell 601, a transmission rope 602 is arranged in the guide shell 601, a first connecting block 603 and a second connecting block 604 are fixedly connected on the transmission rope 602, the first connecting block 603 is connected with the first bag turning frame 2, the second connecting block 604 is connected with the second bag turning frame 3, and the vertical part of the guide shell 601 close to the lead screw 5 penetrates through the first bag turning frame 2, thereby playing a guiding role when the first bag turning frame 2 moves;

[0042]

[0043] ​The corrugated pipe 13 is fixed between the bottom of the top supporting frame 11, the top of the first bag turning frame 2, the bottom of the first bag turning frame 2 and the bottom supporting frame 12, and is located outside the vertical part of the lead screw 5 and the guide transmission mechanism 6, and plays a whole protection role.

[0044] The receiving plate 14 with the top surface flush with the top surface of the bottom supporting frame 12 is fixed in the inside of the purification cylinder 1, and the purification cylinder 1 is provided with a slag discharge door matched with the receiving plate 14; the purification cylinder 1 is also provided with the air inlet pipe 7 and the air outlet pipe 8, the air inlet pipe 7 is arranged corresponding to the inside cavity of the purification bag 4, and the air outlet pipe 8 is arranged corresponding to the cavity between the inner wall of the purification cylinder 1 and the purification bag 4.

[0045] The working principle of the present application is as follows: when in use, in the first purification state inside the purification cylinder 1, at this time, the first bag turning frame 2 is at the top end inside the purification cylinder 1, and the second bag turning frame 3 is at the bottom end inside the purification cylinder 1, wherein the first bag turning frame 2 is fixedly connected with the purification bag 4 between the outer wall of the first bag turning frame 2 and the inner wall of the second bag turning frame 3, wherein the diameter of the first bag turning frame 2 is smaller than the diameter of the second bag turning frame 3, and the cross section of the purification bag 4 is trapezoidal;

[0046] At this time, the flue gas generated during the regeneration of waste asphalt will enter the inside of the air inlet pipe 7 through the pipeline, and the flue gas will enter the inside of the purification bag 4 through the air inlet pipe 7, at this time, under the action of the purification bag 4, the large particle impurities in the flue gas are purified and filtered, and the filtered flue gas will be discharged to the outside through the air outlet pipe 8 for subsequent purification equipment;

[0047] In the first purification state, the connecting pipe 201 of the first bag turning frame 2 will be closed by the sealing plate 9 at this time, that is, at this time, the flue gas will not enter the upper side of the first bag turning frame 2 through the connecting pipe 201, but will be purified and filtered through the purification bag 4;

[0048] After a period of time in the first purification state, the particle impurities attached to the inner wall of the purification bag 4 will block the purification effect of the purification bag 4, at this time, the motor 10 is started;

[0049] After the motor 10 is started, the output end of the motor 10 drives the lead screw 5 to rotate at this time, the rotation of the lead screw 5 drives the first bag turning frame 2 to descend along the axis of the lead screw 5, and the first bag turning frame 2 drives the purification bag 4 to descend;

[0050] Meanwhile, when the first bag turning frame 2 is lowered, the first connecting block 603 fixed on the transmission rope 602 and fixed with the first bag turning frame 2 and the second connecting block 604 fixed on the transmission rope 602 and fixed with the second bag turning frame 3 are driven by the transmission rope 602 of the three sets of guide transmission mechanisms 6, so that when the first bag turning frame 2 is lowered, the second bag turning frame 3 is driven to move upward along the inner wall of the purification cylinder 1 under the action of the transmission rope 602;

[0051] That is, when the first bag turning frame 2 drives the top of the purification cloth bag 4 to move downward and the second bag turning frame 3 drives the bottom of the purification cloth bag 4 to move upward, the purification cloth bag 4 is turned over, that is, the particles originally attached to the inner side are turned over to the outer side, and the outer side of the purification cloth bag 4 without particles is turned over to the inner side;

[0052] When the purification cloth bag 4 is turned over, the particles originally attached to the inner side will fall off to a certain extent during the turning process;

[0053] When the purification cloth bag 4 is turned over and switched to the second purification state, the inlet pipe 7 continues to introduce flue gas, and the flue gas can be back-flushed to clean the particles attached to the outer side of the purification cloth bag 4 after being purified by the purification cloth bag 4, and the top of the inlet pipe 7 is connected and communicated with the lowered connecting pipe 201, so that the flue gas can enter the inner cavity of the purification cloth bag 4;

[0054] That is, within a certain period, the purification cloth bag 4 can be switched between the first purification state and the second purification state, so that the back-flushing cleaning operation of the purification cloth bag 4 is completed synchronously when the flue gas is filtered and purified;

[0055] The cleaned particles will fall onto the surface of the receiving plate 14, and then the worker can periodically open the slag discharge door on one side of the purification cylinder 1 for cleaning operation;

[0056] In summary, the lead screw 5 and the guide transmission mechanism 6 are cooperated to drive the first bag turning frame 2 and the second bag turning frame 3 to move reversely, drive the purification cloth bag 4 to complete the bag turning action, turn the inner side originally attached with dust to the outer side, and switch the outer side without dust to the filter surface; without introducing high-pressure pulse gas, the impurities of the purification cloth bag 4 can be separated from the filter surface, and the traditional high-pressure pulse back-flushing cleaning method is fundamentally replaced;

[0057] Through the periodic switching between the first purification state and the second purification state, the cleaning of the purification cloth bag 4 is completed synchronously under the premise that the flue gas continues to pass through and the filtering operation does not stop; during the bag turning process, the impurities can naturally fall off, and after switching to the second purification state, the flue gas passing through will form a reverse impact on the residual impurities outside the purification cloth bag 4, further improving the cleaning effect and ensuring the stability of the filtering efficiency;

[0058] The purification cloth bag 4 adopts a trapezoidal cross-section design, which is matched with the structure of the first bag turning frame 2 and the second bag turning frame 3, so as to ensure sufficient contact between the flue gas and the filtering surface, improve the interception effect of large-particle dust, provide a structural basis for the bag turning action, and make the filtering and cleaning functions form an organic synergy, so that the subsequent deep purification processes such as activated carbon adsorption and photocatalytic degradation are not affected.

[0059] Although the embodiments of the present application have been shown and described, the specific embodiments are only an explanation of the present application, and are not a limitation of the application, and the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner, and those skilled in the art can make modifications, replacements and variations of the embodiments without creative contribution after reading the specification, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A flue gas purification device for waste asphalt recycling, characterized in that, It includes a purification cylinder (1) for providing a flue gas purification chamber, a bag-turning assembly disposed in the purification cylinder (1), a power transmission mechanism for driving the bag-turning assembly to move, and a purification cloth bag (4) with both ends fixedly connected to the bag-turning assembly. The bag-turning assembly includes a first bag-turning frame (2) and a second bag-turning frame (3) with different diameters, and the purification bag (4) has a trapezoidal cross section adapted to the bag-turning action; The power transmission mechanism includes a motor (10), a lead screw (5) and a guide transmission mechanism (6). The motor (10) drives the first bag-turning frame (2) to move axially through the lead screw (5). The guide transmission mechanism (6) moves in the opposite direction through the transmission rope (602) in conjunction with the second bag-turning frame (3) to drive the purification bag (4) to turn over to realize the removal of impurities and the switching of the filter surface. The purification cylinder (1) is equipped with an air inlet pipe (7) and an exhaust pipe (8), which, in conjunction with the bag-flipping assembly, form an alternating first purification state and a second purification state, thereby achieving continuous filtration of flue gas and self-cleaning of the filter bag.

2. The flue gas purification device for waste asphalt recycling according to claim 1, characterized in that: The diameter of the first bag-turning frame (2) is smaller than that of the second bag-turning frame (3). One end of the purification bag (4) is fixed to the outer wall of the first bag-turning frame (2), and the other end is fixed to the inner wall of the second bag-turning frame (3).

3. The flue gas purification device for waste asphalt recycling according to claim 1, characterized in that: A connecting pipe (201) is provided at the bottom of one side of the first bag-turning frame (2), and a sealing plate (9) is fixed at the top of the purification cylinder (1). When the first bag-turning frame (2) is in the top position, the sealing plate (9) plays a role in sealing the connecting pipe (201). After the first bag-turning frame (2) descends, the connecting pipe (201) is connected to the top of the air inlet pipe (7), so that the flue gas to be filtered enters the inside of the purification bag (4).

4. The flue gas purification device for waste asphalt recycling according to claim 1, characterized in that: The guide transmission mechanism (6) includes a guide shell (601), the transmission rope (602) passes through the guide shell (601), and a first connecting block (603) connected to the first bag-turning frame (2) and a second connecting block (604) connected to the second bag-turning frame (3) are fixed on it. The vertical part of the guide shell (601) near the lead screw (5) passes through the first bag-turning frame (2) and plays a guiding role when the first bag-turning frame (2) moves.

5. The flue gas purification device for waste asphalt recycling according to claim 1, characterized in that: The top and bottom of the purification cylinder (1) are respectively fixed with a top support frame (11) and a bottom support frame (12). The top support frame (11) and the bottom support frame (12) provide movable support for the lead screw (5).

6. The flue gas purification device for waste asphalt recycling according to claim 5, characterized in that: Corrugated pipes (13) are fixed between the bottom of the top support frame (11) and the top of the first bag-turning frame (2), and between the bottom of the first bag-turning frame (2) and the bottom support frame (12). The bellows (13) is located on the outside of the vertical part of the lead screw (5) and the guide transmission mechanism (6), and plays an overall protective role.

7. The flue gas purification device for waste asphalt recycling according to claim 5, characterized in that: The purification cylinder (1) has a receiving plate (14) with its top surface flush with the top surface of the bottom support frame (12) fixed inside. The purification cylinder (1) has a slag discharge door on one side that is compatible with the receiving plate (14).

8. The flue gas purification device for waste asphalt recycling according to claim 1, characterized in that: A motor (10) is installed at the center of the top of the purification cylinder (1). The output end of the motor (10) passes through the purification cylinder (1) and is fixedly connected to the top of the lead screw (5) to drive the rotation of the lead screw (5).

9. The flue gas purification device for waste asphalt recycling according to claim 1, characterized in that: The air inlet pipe (7) is correspondingly arranged to the inner cavity of the purification bag (4), and the exhaust pipe (8) is correspondingly arranged to the cavity between the inner wall of the purification cylinder (1) and the purification bag (4).

10. The flue gas purification device for waste asphalt recycling according to claim 1, characterized in that: The purification bag (4) is made of composite fiber material made of polytetrafluoroethylene or glass fiber, which has the characteristics of high temperature resistance, wear resistance and fatigue resistance.

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