Asphalt mixture plant hot regeneration tail gas treatment system

Abstract

The invention discloses an asphalt mixture plant hot regeneration tail gas treatment system, which belongs to the technical field of asphalt tail gas treatment. The regeneration tail gas treatment system includes a tail gas intake pipe, a crushing and dust raising mechanism, an exhaust gas chamber, a powder supply device, a transfer pipe and a bag dust removal device, and the bag dust removal device includes a bag dust collector and an induced draft fan; the crushing and dust raising mechanism is composed of a shell, a crushing and dust raising component and a power system, the top of the shell is connected to the bottom of the exhaust gas chamber, and the outlet end of the tail gas intake pipe is connected to the side wall of the shell; the exhaust gas chamber is cylindrical, and a conical cylinder is installed on the inner side of the upper part of the conical cylinder, the top is fixedly connected to the inner wall of the exhaust gas chamber, and a shrinking vortex separation port is provided at the bottom, and the side wall of the exhaust gas chamber above the conical cylinder is also provided with a tail gas outlet, and the tail gas outlet is connected to the bag dust collector through a transfer pipe. The invention can crush and decompose the larger agglomerated sticky substances in the regeneration tail gas, and improve the service performance and life of the bag filter bag.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt tail gas treatment, and more specifically to an asphalt mixture plant hot regeneration tail gas treatment system. Background Art

[0002] Asphalt mixture thermal regeneration technology is a technology that recycles waste asphalt mixture. Since countercurrent heating technology has higher thermal efficiency, more and more manufacturers choose to use countercurrent heating to regenerate asphalt mixture.

[0003] The regeneration tail gas produced by countercurrent heating has complex components, including fine powder of regenerated recycled materials, asphalt particles, light and heavy oils and other viscous substances, which need to be treated before they can be discharged. The Chinese patent application publication number CN 117205716A discloses a purification control method for factory-mixed hot regeneration tail gas, which purifies the regeneration tail gas based on a bag dust collector and a powder spraying device. The bag dust collector includes a bag dust collector body, an air intake pipe connected to the bag dust collector body for the regeneration tail gas to enter, an induced draft fan connected to the air outlet of the bag dust collector body, an exhaust pipe connected to the induced draft fan, and an asphalt fume detection mechanism arranged on the exhaust pipe; the powder spraying device includes a powder spraying pipe connected to the air intake pipe, a powder silo for storing powder, a Roots blower connected to the powder spraying pipe, and an impeller feeder connected between the Roots blower and the powder silo. The patented regenerated exhaust gas is sprayed with powder through a powder spraying device before entering the bag filter body and mixed with the regenerated exhaust gas in the air intake pipe, so that the sticky substances in the regenerated exhaust gas are wrapped with the powder to reduce its viscosity, thereby preventing it from adhering to the filter bag of the bag filter body.

[0004] However, there are two types of sticky substances in exhaust gas: fine dispersed sticky substances and larger agglomerated sticky substances. Among them, the viscosity of fine dispersed sticky substances will decrease rapidly due to the large relative contact area with the powder, and will not adhere to the filter bag. For larger agglomerated sticky substances, only the surface viscosity will decrease after being coated with powder. For example, if the air is directly introduced into the filter bag of the bag filter, the internal sticky substances will still adhere to the filter bag under extrusion, which will reduce the performance and service life of the filter bag. For this reason, we provide an asphalt mixture plant hot regeneration exhaust gas treatment system. Summary of the invention

[0005] The present invention provides an asphalt mixture plant hot regeneration exhaust gas treatment system, the main purpose of which is to solve the problem that large agglomerated sticky substances in the existing regeneration exhaust gas will still adhere to the filter bag of the bag dust collector after powder spraying treatment, resulting in reduced performance and service life of the filter bag.

[0006] The present invention adopts the following technical solution:

[0007] An asphalt mixture plant hot regeneration tail gas treatment system, including a tail gas intake pipeline, a bag dust removal device and a powder supply device, the bag dust removal device includes a bag dust collector, an induced draft fan connected to the air outlet of the bag dust collector, and an exhaust pipe connected to the induced draft fan; the regeneration tail gas treatment system also includes an exhaust gas chamber, a crushing dust raising mechanism and a transfer pipeline, the crushing dust raising mechanism is composed of a shell, a crushing dust raising component installed in the shell and a power system that drives the crushing dust raising component to rotate, the top of the shell is connected to the bottom of the exhaust gas chamber, and the tail gas is connected to the bottom of the exhaust gas chamber. The outlet end of the air intake pipe is connected to the side wall of the shell, and the powder supply device is installed on the lower side of the exhaust chamber to transport powder into the exhaust chamber; the exhaust chamber is cylindrical, and a conical cylinder is installed on the inner side of the upper part of the exhaust chamber. The top of the conical cylinder is an open structure and is fixedly connected to the inner wall of the exhaust chamber. The bottom of the conical cylinder is provided with a reduced vortex separation port, and the side wall of the exhaust chamber above the conical cylinder is also provided with an exhaust outlet connected to the air inlet end of the transfer pipe, and the air outlet end of the transfer pipe is connected to the air inlet of the bag collector.

[0008] Specifically, the above-mentioned crushing and dust-raising component includes a rotating shaft, a scraping blade layer, a stirring and crushing blade layer and a fan blade layer. The bottom layer of the rotating shaft is provided with a scraping blade layer, and the rotating shaft above the scraping blade layer is also provided with at least several stirring and crushing layers and several fan blade layers.

[0009] In a preferred embodiment, the rotating shaft above the scraping blade layer is continuously provided with two stirring and crushing blade layers from bottom to top, and above the stirring and crushing layer are also provided with two fan blade layers, a stirring and crushing blade layer arranged in a staggered array, and a stirring and crushing blade layer.

[0010] In a preferred embodiment, the stirring and crushing blade layer includes a plurality of stirring and crushing blades arranged at intervals along the circumferential surface of the rotating shaft, each stirring and crushing blade includes a crushing plate, a stirring plate and a plurality of rib plates, the stirring plate is obliquely fixed on the upper surface of the crushing plate, and a plurality of rib plates are welded at intervals between the back side of the stirring plate and the crushing plate.

[0011] In a preferred embodiment, the fan blade layer includes a plurality of fan blades staggered along the circumferential surface of the rotating shaft, and the fan blades are spiral-shaped.

[0012] In a preferred embodiment, the top end of the conical cylinder is seamlessly welded to the side wall of the exhaust chamber.

[0013] In a preferred embodiment, the exhaust gas outlet is connected to the transfer pipe through an arc-shaped pipe tangent to the side wall of the exhaust chamber.

[0014] In a preferred embodiment, the powder supply device is composed of an impeller feeder and a screw conveyor.

[0015] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following advantages:

[0016] The regenerative tail gas treatment system of the present invention has a waste gas chamber between the tail gas inlet pipes, a crushing dust raising mechanism is installed at the bottom of the waste gas chamber, and a conical cylinder with a shrinking vortex separation port at the bottom is also installed on the upper part of the waste gas chamber. The combination of regenerated exhaust gas and powder input by the powder supply device rotates and rises in the exhaust gas chamber. The fine and dispersed viscous substances will fuse and agglomerate with the powder in the vortex, and the viscosity will be reduced. Because of their small weight, the rotation radius of the vortex formed is small, and they can smoothly pass through the vortex separation port to enter the exhaust gas outlet, and then pass through the bag dust collector for gas-solid separation to complete dust removal; while the combination of larger agglomerated viscous substances and powders has a large weight and a rotation radius greater than the radius of the vortex separation port at the top of the exhaust gas chamber, and cannot be easily discharged. In the process, they continue to stick to other agglomerates and fall into the crushing and dust raising mechanism. The crushing and dust raising mechanism uses various functional blades to crush the larger agglomerates that fall back and stir them with the powder transported by the supply device, so that they are split into fine and dispersed viscous substances with smaller weight and lower viscosity. Then they are lifted up and become a combination that can pass through the vortex separation port, and pass through the bag dust collector for gas-solid separation to complete dust removal. Therefore, the present invention can break up and decompose the larger agglomerated sticky substances in the regenerated tail gas into fine dispersed sticky substances, increase the contact area between the sticky substances and the powder, prevent the sticky substances from adhering to the filter bags of the bag filter, and improve the performance and service life of the filter bags. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a front view of the exhaust chamber of the present invention.

[0019] Figure 3 It is a top view of the exhaust chamber of the present invention.

[0020] Figure 4 It is a top view of the dust crushing and raising mechanism of the present invention.

[0021] Figure 5 for Figure 4 Cross-sectional view along the AA direction.

[0022] Figure 6 for Figure 5 Cross-sectional view along the BB direction.

[0023] Figure 7 for Figure 5 Cross-sectional view along CC direction.

[0024] Figure 8 for Figure 5 Cross-sectional view along the DD direction.

[0025] Fig. 9 It is a schematic diagram of the structure of the crushing and stirring blades of the present invention.

[0026] Fig.10 It is a schematic structural diagram of the fan blade of the present invention.

[0027] Fig.11 It is a schematic diagram of the structure of the powder feeding device of the present invention. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described below with reference to the accompanying drawings. In order to fully understand the present invention, many details are described below, but for those skilled in the art, the present invention can be implemented without these details. For well-known components, methods and processes, they are not described in detail below.

[0029] An asphalt mixture plant hot regeneration tail gas treatment system, refer to Figure 1 , including an exhaust gas intake pipe 10, a crushing and dust-raising mechanism 20, an exhaust gas chamber 30, a powder supply device 40, a transfer pipe 50 and a bag dust removal device 60.

[0030] Reference Figure 2 and Figure 3 The exhaust chamber 30 is cylindrical, and a conical cylinder 31 is installed inside the upper part of the exhaust chamber 30. The top of the conical cylinder 31 is an open structure and is fixedly connected to the inner wall of the exhaust chamber 30. Preferably, the top of the conical cylinder 31 and the side wall of the exhaust chamber 30 are seamlessly welded.

[0031] Reference Figure 2 and Figure 3 The bottom of the conical cylinder 31 is provided with a reduced vortex separation port 310, and the side wall of the exhaust chamber 30 above the conical cylinder 31 is also provided with an exhaust outlet, which is connected to the air inlet end of the transfer pipe 50 through an arc-shaped pipe 32 tangent to the side wall of the exhaust chamber. The bottom of the exhaust chamber 30 forms a conical body 33 whose central axis is the same as the central axis of the exhaust chamber, and the conical body 33 is in a shape of being larger at the top and smaller at the bottom.

[0032] Reference Figure 1 , Figure 4 and Figure 5 The above-mentioned crushing and dust raising mechanism 20 is composed of a shell 21, a crushing and dust raising component 22 and a power system 23. The shell 21 is fixed to the bottom of the cone 33 and communicates with the bottom of the cone 33. The crushing and dust raising component 22 is installed in the shell 21, and the power system 23 is installed outside the shell 21 and connected to the crushing and dust raising component 22 to drive the crushing and dust raising component 22 to rotate. The outlet end of the exhaust gas intake pipe 10 is communicated with the side wall of the shell 21.

[0033] Reference Figure 5 and Figure 6 The above-mentioned crushing and dust raising component 22 includes a rotating shaft 221, a scraping blade layer 222, a stirring and crushing blade layer 223 and a fan blade layer 224. A scraping blade layer 222 is provided at the bottom of the rotating shaft 221, and the scraping blade layer 222 preferably includes six scraping blades 2221 arranged at intervals along the circumferential surface of the rotating shaft to remove the adhesive at the bottom; the rotating shaft above the scraping blade layer 222 is also provided with at least a plurality of stirring and crushing blade layers 223 and a plurality of fan blade layers 224.

[0034] Reference Figure 5 Preferably, the rotating shaft 221 above the scraping blade layer 222 shown in this embodiment is continuously provided with two stirring and crushing layers 223 from bottom to top, and above the stirring and crushing blade layer 223 there are also provided a fan blade layer 224 and a stirring and crushing blade layer 223 arranged in a staggered array using two fan blade layers 224 and one stirring and crushing blade layer 223.

[0035] Reference Figure 7 and Fig. 9 Each of the above-mentioned stirring and crushing blade layers 223 includes six stirring and crushing blades 2231 arranged at intervals along the circumferential surface of the rotating shaft, and each stirring and crushing blade 2231 includes a crushing plate 22311, a stirring plate 22312 and a plurality of rib plates 22313. The stirring plate 22312 is obliquely fixed on the upper surface of the crushing plate 22311, and a plurality of rib plates 22313 are welded at intervals between the back side of the stirring plate and the crushing plate 22311.

[0036] Among them, the two stirring and crushing blade layers 223 at the bottom, the stirring and crushing blade layer 223 located at the lower layer is used to stir and crush the bottom adhesive, the powder transported by the powder supply device 40, and the larger agglomerates that cannot enter the exhaust chamber outlet and fall back to the crushing dust mechanism; and the stirring and crushing blade layer 223 located at the upper layer, its stirring and crushing blades 2231 adopt a three-in-three-out arrangement method to enhance the stirring effect.

[0037] Reference Figure 8 and Fig.10 The fan blade layer 224 includes eight fan blades 2241 arranged alternately along the circumference of the rotating shaft, and the fan blades 2241 are preferably spiral-shaped. The fan blade layer 224 is used to roll up the powder and form a vortex in the exhaust chamber to fuse the powder with the bonding material in the exhaust gas and reduce the viscosity of the bonding material in the exhaust gas.

[0038] All the above blades are welded on the rotating shaft 221, the rotating shaft 221 is mounted on the housing 21 through a bearing, and the lower end of the rotating shaft 221 passes through the housing 21 and is connected to the power system 23. The power system 23 can be composed of a motor, a driving gear, a driven gear and a chain, which will not be described in detail here.

[0039] Reference Fig.11 The powder supply device 40 is installed at the lower side of the exhaust chamber 30 to convey powder into the exhaust chamber 30. The powder supply device 40 is composed of an impeller feeder 41 and a screw conveyor 42. Compared with the Roots blower, the screw conveyor 42 is used to convey powder. The power of the powder conveying is small, the supply volume is large, and the structure is simple.

[0040] Reference Figure 1 The bag dust removal device 60 includes a bag dust collector 61, an induced draft fan 62 connected to the air outlet of the bag dust collector 61, and an exhaust pipe 63 connected to the induced draft fan 62. The air inlet 61 of the bag dust collector is connected to the air outlet end of the transfer pipe 50.

[0041] The process of treating the regenerated tail gas of the present invention is as follows:

[0042] The combination of regenerated exhaust gas and powder input by the powder supply device rotates and rises in the exhaust gas chamber. The fine and dispersed viscous substances will fuse and agglomerate with the powder in the vortex, and the viscosity will be reduced. Because of their small weight, the rotation radius of the vortex formed is small, and they can smoothly pass through the vortex separation port to enter the exhaust gas outlet, and then pass through the bag dust collector for gas-solid separation to complete dust removal; while the combination of larger agglomerated viscous substances and powders has a large weight and a rotation radius greater than the radius of the vortex separation port at the top of the exhaust gas chamber, and cannot be easily discharged. In the process, they continue to stick to other agglomerates and fall into the crushing and dust raising mechanism. The crushing and dust raising mechanism uses various functional blades to crush the larger agglomerates that fall back and stir them with the powder transported by the supply device, so that they are split into fine and dispersed viscous substances with smaller weight and lower viscosity. Then they are lifted up and become a combination that can pass through the vortex separation port, and pass through the bag dust collector for gas-solid separation to complete dust removal.

[0043] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. An asphalt mixture plant hot regeneration tail gas treatment system, comprising a tail gas intake pipeline, a bag dust removal device and a powder supply device, wherein the bag dust removal device comprises a bag dust collector, an induced draft fan connected to the air outlet of the bag dust collector, and an exhaust pipe connected to the induced draft fan; characterized in that: The regeneration exhaust gas treatment system also includes an exhaust chamber, a crushing dust raising mechanism and a transfer pipeline. The crushing dust raising mechanism consists of a shell, a crushing dust raising component installed in the shell and a power system for driving the crushing dust raising component to rotate. The top of the shell is connected to the bottom of the exhaust chamber, and the outlet end of the exhaust gas intake pipeline is connected to the side wall of the shell. The powder supply device is installed on the lower side of the exhaust chamber to transport powder into the exhaust chamber. The exhaust chamber is cylindrical, and a conical cylinder is installed on the inner side of the upper part of the exhaust chamber. The top of the conical cylinder is an open structure and is fixedly connected to the inner wall of the exhaust chamber. A reduced vortex separation port is provided at the bottom, and a tail gas outlet connected to the air inlet end of the transfer pipe is also provided on the side wall of the exhaust chamber above the conical cylinder, and the air outlet end of the transfer pipe is connected to the air inlet of the bag collector; the dust crushing component includes a rotating shaft, a scraping blade layer, a stirring and crushing blade layer and a fan blade layer, a scraping blade layer is provided on the bottom of the rotating shaft, and two stirring and crushing layers are continuously provided on the rotating shaft above the scraping blade layer from bottom to top, and above the stirring and crushing blade layer there are also two fan blade layers, a fan blade layer arranged in a staggered array of a stirring and crushing blade layer, and a stirring and crushing blade layer.

2. The asphalt mixture plant hot regeneration tail gas treatment system according to claim 1, characterized in that: The stirring and crushing blade layer includes a plurality of stirring and crushing blades arranged at intervals along the circumferential surface of the rotating shaft, each stirring and crushing blade includes a crushing plate, a stirring plate and a plurality of rib plates, the stirring plate is obliquely fixed on the upper surface of the crushing plate, and a plurality of rib plates are welded between the back side of the stirring plate and the crushing plate.

3. The asphalt mixture plant hot regeneration tail gas treatment system according to claim 1, characterized in that: The fan blade layer includes a plurality of fan blades arranged alternately along the circumferential surface of the rotating shaft, and the fan blades are spiral-shaped.

4. The asphalt mixture plant hot regeneration tail gas treatment system according to claim 1, characterized in that: The top end of the conical cylinder is seamlessly welded to the side wall of the exhaust chamber.

5. The asphalt mixture plant hot regeneration tail gas treatment system according to claim 1, characterized in that: The tail gas outlet is connected to the transfer pipe through an arc-shaped pipe tangent to the side wall of the exhaust gas chamber.

6. The asphalt mixture plant hot regeneration tail gas treatment system according to claim 1, characterized in that: The powder supply device is composed of an impeller feeder and a screw conveyor.

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