An asphalt fume recovery system and a hot air heating unit

Abstract

This invention discloses an asphalt fume recovery system and a hot air heating machine, belonging to the field of road maintenance equipment. It includes a main installation body with a heating chamber below it for accommodating asphalt mixture piles. The main installation body contains a main fume recovery chamber connected to the heating chamber. Auxiliary fume recovery hoods are located on both sides of the main installation body. The main fume recovery chamber and the auxiliary fume recovery hoods are connected to a dust removal and degradation chamber. The dust removal and degradation chamber, a fan, and a hot air furnace are sequentially connected by pipelines. After being dusted in the dust removal and degradation chamber, the asphalt fume is sent to the hot air furnace for combustion by the fan. The heat generated by the combustion of the asphalt fume in the hot air furnace is used to heat the chamber and raise the temperature of the asphalt mixture pile. This invention solves the problem of fugitive emissions of asphalt fume during operation, especially in the material distribution, heating, and collection stages, which causes environmental pollution, and achieves centralized treatment of asphalt fume.

Description

Technical Field

[0001] This invention belongs to the field of road maintenance equipment, specifically relating to an asphalt fume recovery system and a hot air heating machine. Background Technology

[0002] Hot air heating machines are an important component of on-site thermal regeneration equipment. During asphalt road construction, multiple road heating machines are usually used to heat and soften the asphalt pavement. After the pavement is loosened by a heated milling machine, a trapezoidal asphalt mixture stockpile is formed. The temperature of the trapezoidal asphalt mixture is generally 110℃-130℃, with a high moisture content and low temperature. At this time, a hot air heating machine is needed to reheat the asphalt mixture, raising the temperature to above 160℃ and removing excess moisture.

[0003] In existing technologies, hot air heating machines typically heat asphalt mixtures using a process involving a distribution screw to distribute the mixture, a heating device to heat the mixture, and an aggregate screw to collect it. This process presents several problems: First, the surface temperature of the infrared heating machine can reach 1000℃, easily causing "surface scorching and internal scorching" in the heated asphalt mixture. This means the surface temperature exceeds 300℃, while the internal asphalt mixture becomes hard and severely aged, resulting in the unorganized emission of asphalt fumes and serious environmental pollution. Second, infrared heating machines lack asphalt fume recovery and treatment devices, allowing high-temperature asphalt fumes to escape directly. The lack of necessary protective measures for vegetation causes scorching or even death of surrounding vegetation. Third, to increase the heating capacity of the asphalt mixture, the length or number of heating units is often increased. However, there is a lack of process insulation between heating units, leaving the heated asphalt mixture exposed to the environment, leading to leakage of high-temperature asphalt fumes and heat loss. Summary of the Invention

[0004] The purpose of this invention is to provide an asphalt fume recovery system and a hot air heating machine, which can solve the problem of unorganized emission of asphalt fumes and environmental pollution during the operation of the hot air heating machine, and realize the centralized treatment of asphalt fumes.

[0005] To address the aforementioned problems, the present invention adopts the following technical solution: Firstly, the present invention provides an asphalt fume recovery system, comprising an installation body, a heating chamber for accommodating an asphalt mixture pile is disposed below the installation body; a main fume recovery chamber communicating with the heating chamber is disposed within the installation body; auxiliary fume recovery hoods are disposed on both sides of the installation body; the main fume recovery chamber and the auxiliary fume recovery hoods are connected to a dust removal and degradation chamber; the dust removal and degradation chamber, a blower, and a hot air furnace are sequentially connected by pipelines; the main fume recovery chamber and the auxiliary fume recovery hoods collect the asphalt fume in the heating chamber; after the asphalt fume is dedusted by dust removal and degradation in the dust removal chamber, it is then sent to the hot air furnace for combustion by the blower; the heat generated by the combustion of the asphalt fume in the hot air furnace is used to heat the chamber and raise the temperature of the asphalt mixture pile.

[0006] Furthermore, the main flue gas recovery chamber and the auxiliary flue gas recovery hood are symmetrically distributed on both sides of the heating chamber; the top of the mounting body is provided with an annular circulation channel, one side of which is connected to the main flue gas recovery chamber and the auxiliary flue gas recovery hood, and the other side of which is connected to the dust removal and degradation chamber.

[0007] Furthermore, a first fireproof cloth is provided between the main flue gas recovery chamber and the auxiliary flue gas recovery hood. The first fireproof cloth is used to block the asphalt fumes from spreading outward from the main flue gas recovery chamber. The first fireproof cloth is fixed to the installation body by a first baffle.

[0008] Furthermore, a second fireproof cloth is provided on the side of the auxiliary flue gas recovery hood away from the main flue gas recovery chamber. The second fireproof cloth is used to block the asphalt fumes from spreading outward from the auxiliary flue gas recovery hood. The second fireproof cloth is fixed to the auxiliary flue gas recovery hood by a second baffle.

[0009] Furthermore, a sealing mesh is provided between the main flue gas recovery chamber and the auxiliary flue gas recovery hood. The sealing mesh is used to filter asphalt fumes and is rotatably connected to the bottom of the mounting body.

[0010] Furthermore, the auxiliary flue gas recovery hood is configured in a funnel shape, with its wide opening facing downwards and flush with the bottom of the mounting body.

[0011] Secondly, the present invention also provides a hot air heating machine, including a vehicle body and the asphalt fume recovery system. A material distribution device is provided at the front of the vehicle body, and a material collection device is provided at the rear of the vehicle body. Multiple asphalt fume recovery systems are provided between the material distribution device and the material collection device, and a front insulation box is provided between two adjacent asphalt fume recovery systems.

[0012] Furthermore, the front insulation box includes a front section, a middle section, and a rear section. The wide opening of the front section is connected to the outlet of the asphalt fume recovery system at the front. The narrow opening of the front section is connected to the middle section. The middle section and the rear section are hinged and fixed. The outlet of the rear section is connected to the inlet of the asphalt fume recovery system at the rear.

[0013] Furthermore, a rear insulation box is hinged and fixed at the rear of the material collection device. The cross-section of the rear insulation box is trapezoidal, and the inlet of the rear insulation box is connected to the outlet of the material collection device.

[0014] Furthermore, protective devices are provided on both sides of the vehicle body. The protective devices are located outside the auxiliary flue gas recovery hood. The protective devices include multiple sets of protective plates arranged side by side. The protective plates are connected to the longitudinal support, and the longitudinal support is fixed to the vehicle body by a connecting rod support.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: On the one hand, the present invention provides a heating chamber for accommodating asphalt mixture piles below the installation body; the installation body is provided with a main flue gas recovery chamber communicating with the heating chamber; auxiliary flue gas recovery hoods are provided on both sides of the installation body, the main flue gas recovery chamber and the auxiliary flue gas recovery hoods are connected to a dust removal and degradation chamber, the dust removal and degradation chamber, the fan and the hot air furnace are connected in sequence by pipelines; the main flue gas recovery chamber and the auxiliary flue gas recovery hoods collect asphalt fumes in the heating chamber; after the asphalt fumes are dusted in the dust removal and degradation chamber, they are sent to the hot air furnace for combustion by the fan, and the heat generated by the combustion of asphalt fumes in the hot air furnace is used to heat the chamber and raise the temperature of the asphalt mixture pile. By setting up multiple sets of asphalt fumes recovery systems on the installation body, the fumes generated by the asphalt mixture piles are recovered and reused through separate channels, solving the problem of unorganized emission of asphalt fumes and environmental pollution during the operation of the temperature raising machine, especially in the material distribution, heating and collection stages, and realizing centralized treatment of asphalt fumes.

[0016] On the other hand, in this invention, the material distribution device, the flue gas recovery system, the front insulation box, the rear insulation box, and the material collection device are combined to form a fully enclosed asphalt flue gas sealing chamber. By adding the front and rear insulation boxes, the heating and insulation of the asphalt mixture is fully covered, forming a fully enclosed asphalt flue gas sealing chamber, realizing the guided reuse of asphalt flue gas, and making the centralized treatment of asphalt flue gas more environmentally friendly and efficient. At the same time, the use of stainless steel herringbone woven sealing mesh, double-layer high-temperature fireproof cloth, and protective devices as triple measures to prevent asphalt flue gas from overflowing solves the problem of high-temperature asphalt flue gas overflowing causing the surrounding green vegetation to be scorched or even die, and completely reduces the concentration, temperature, and speed of asphalt flue gas to a minimum. Attached Figure Description

[0017] Figure 1This is an overall structural diagram of an asphalt fume recovery system provided in Embodiment 1 of the present invention;

[0018] Figure 2 This is a bottom view of an asphalt fume recovery system provided in Embodiment 1 of the present invention;

[0019] Figure 3 This is a schematic diagram of an asphalt fume recovery system provided in Embodiment 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of the asphalt fume circulation channel provided in Embodiment 1 of the present invention;

[0021] Figure 5 This is the overall layout diagram of the temperature raising machine provided in Embodiment 2 of the present invention;

[0022] Figure 6 This is a side view of the temperature raising machine provided in Embodiment 2 of the present invention;

[0023] In the diagram: 1-Main installation body; 2-Heating chamber; 21-Asphalt mixture pile; 3-Flue gas recovery device; 31-Main flue gas recovery chamber; 32-Auxiliary flue gas recovery hood; 33-Dust removal and degradation chamber; 34-Fan; 35-Hot air furnace; 36-Annular circulation channel; 37-First fireproof cloth; 371-Second fireproof cloth; 38-First baffle; 381-Second baffle; 39-Sealing net; 4-Distribution device; 5-Collection device; 6-Front insulation box; 61-Front end section; 162-Middle section section; 63-Rear section section; 7-Rear insulation box; 8-Protective device; 81-Protective plate; 82-Longitudinal support; 83-Connecting rod support. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0025] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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. Therefore, they should not be construed as limitations on this invention.

[0026] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Example 1

[0029] like Figures 1 to 2 As shown, in one aspect, an embodiment of the present invention provides an asphalt fume recovery system, including an installation body 1. A heating chamber 2 for accommodating an asphalt mixture pile 21 is provided below the installation body 1. Multiple road heating machines heat and soften the asphalt pavement, and after the pavement is milled and loosened by a heated milling machine, a trapezoidal asphalt mixture pile 21 with a thickness of 25cm and a width of about 1200mm is formed. The mixture pile 21 is located in the heating chamber 2. A fume recovery device 3 is provided inside the installation body 1.

[0030] like Figure 3 As shown, the flue gas recovery device 3 includes a main flue gas recovery chamber 31 connected to the heating chamber 2; the main flue gas recovery chamber 31 is disposed within the mounting body 1; auxiliary flue gas recovery hoods 32 are provided on both sides of the mounting body 1, and the main flue gas recovery chamber 31 and auxiliary flue gas recovery hoods 32 are symmetrically distributed on both sides of the heating chamber 2; an annular circulation channel 36 is provided at the top of the mounting body 1, one side of the annular circulation channel 36 is connected to the main flue gas recovery chamber 31 and the auxiliary flue gas recovery hood 32, and the other side of the annular circulation channel 36 is connected to the dust removal and degradation chamber 33; a sealing mesh 39 is provided between the main flue gas recovery chamber 31 and the auxiliary flue gas recovery hood 32, the sealing mesh 39 is used to filter asphalt fumes, and the sealing mesh 39 is rotatably connected to the bottom of the mounting body 1; the auxiliary flue gas recovery hood 32 is configured as a funnel shape, with the wide opening of the auxiliary flue gas recovery hood 32 facing downward and flush with the bottom of the mounting body 1.

[0031] The main flue gas recovery chamber 31 and the auxiliary flue gas recovery hood 32 are connected to the dust removal and degradation chamber 33. The dust removal and degradation chamber 33, the blower 34, and the hot air furnace 35 are connected in sequence by pipelines. The main flue gas recovery chamber 31 and the auxiliary flue gas recovery hood 32 collect the asphalt fumes in the heating chamber 2. After the asphalt fumes are dusted by the dust removal and degradation chamber 33, they are sent to the hot air furnace 35 by the blower 34 for combustion. The heat generated by the combustion of the asphalt fumes in the hot air furnace 35 is used to heat the chamber 2 and raise the temperature of the asphalt mixture pile 21. A connection is provided between the main flue gas recovery chamber 31 and the auxiliary flue gas recovery hood 32. The first fireproof cloth 37 is used to block asphalt fumes from spreading outward from the main flue gas recovery chamber 31. The first fireproof cloth 37 is fixed to the mounting body 1 by a first baffle 38. The auxiliary flue gas recovery hood 32 is provided with a second fireproof cloth 371 on the side away from the main flue gas recovery chamber 31. The second fireproof cloth 371 is used to block asphalt fumes from spreading outward from the auxiliary flue gas recovery hood 32. The second fireproof cloth 371 is fixed to the auxiliary flue gas recovery hood 32 by a second baffle 381. The first fireproof cloth 37 and the second fireproof cloth 371 are high-temperature resistant fireproof cloths.

[0032] like Figure 4 As shown, the asphalt mixture pile 21 in the heating chamber 2 is a trapezoidal pile of asphalt mixture formed by hot milling. A portion of the large particulate flue gas generated by the asphalt mixture pile 21 in the heating chamber 2 enters the dust removal and degradation chamber 33 through the main flue gas recovery chamber 31. Specifically, the flue gas in the flue gas recovery chamber 31 enters the dust removal and degradation chamber 33 through the annular circulation channel 36. Another portion of the small particulate asphalt flue gas generated by the asphalt mixture pile 21 in the heating chamber 2 enters the annular circulation channel 36 through the sealing net 39, the first fireproof cloth 37, and the auxiliary flue gas recovery hood 32 in sequence. Driven by the fan 34, the flue gas in the circulation channel 36 enters the dust removal and degradation chamber 33 for dust removal, degradation, and sedimentation. Finally, the asphalt flue gas is blown into the hot air furnace 35. The flame tip temperature of the diesel burner in the hot air furnace 35 is 1100℃. The asphalt flue gas is burned and decomposed to form clean high-temperature hot air for secondary utilization.

[0033] This embodiment solves the problem of unorganized emissions of asphalt fumes and environmental pollution caused by the asphalt mixture pile 21 during the operation of the heating machine, especially in the material distribution, heating and collection stages, by setting up multiple sets of asphalt fume recovery systems on the main installation body 1. This achieves centralized treatment of asphalt fumes.

[0034] Example 2

[0035] On the other hand, this embodiment of the invention also provides a hot air heating machine, characterized in that it includes a vehicle body and the asphalt fume recovery system described in Embodiment 1. A material distribution device 4 is provided at the front of the vehicle body, and a material collection device 5 is provided at the rear of the vehicle body. Multiple asphalt fume recovery systems are provided between the material distribution device 4 and the material collection device 5. In this embodiment, the number of asphalt fume recovery systems is 3 sets, and a front insulation box 6 is provided between two adjacent asphalt fume recovery systems.

[0036] The front insulation box 6 includes a front end portion 61, a middle section portion 62, and a rear section portion 63. The front end portion 61 is trapezoidal, and its wide opening connects to the outlet of the asphalt fume recovery system in front. The narrow opening of the front end portion 61 connects to the middle section portion 62. The middle section portion 62 and the rear section portion 63 are hinged and fixed, and the outlet of the rear section portion 63 connects to the inlet of the asphalt fume recovery system behind. A rear insulation box 7 is hinged and fixed to the rear of the collecting device 5. The cross-section of the rear insulation box 7 is trapezoidal, and the inlet of the rear insulation box 7 is opposite to the outlet of the collecting device 5. High-temperature fireproof cloth is provided on the left, right, and rear sides of the front insulation box 6 and the rear insulation box 7, and the high-temperature fireproof cloth is in contact with the road surface or asphalt mixture.

[0037] Protective devices 8 are provided on both sides of the vehicle body. Multiple protective devices 8 are provided and are located outside the auxiliary flue gas recovery hood 32. Each protective device 8 includes multiple sets of protective plates 81 arranged side by side. The protective plates 81 are connected to the longitudinal support 82. The longitudinal support 82 is fixed to the vehicle body by a parallelogram 83 connecting rod support 83. According to experimental research, under normal working conditions, the probability of asphalt fumes passing through the stainless steel herringbone woven sealing net 39, the first fireproof cloth 37, and the second fireproof cloth 371 in sequence is less than 5%. Green protective plates are set as the last line of protection to adapt to special construction environments such as strong winds and crosswinds.

[0038] In this embodiment, the material distribution device 4, the flue gas recovery system 3, the front insulation box 6, the rear insulation box 7, and the material collection device 5 are combined to form a fully enclosed asphalt flue gas sealing chamber. By adding the front insulation box 6 and the rear insulation box 7, the heating and insulation of the asphalt mixture is fully covered, forming a fully enclosed asphalt flue gas sealing chamber, realizing the guided reuse of asphalt flue gas, and making the centralized treatment of asphalt flue gas more environmentally friendly and efficient. At the same time, the use of stainless steel herringbone woven sealing mesh 39, double-layer high-temperature fireproof cloth, and protective device 8 as triple measures to prevent asphalt flue gas from overflowing solves the problem of high-temperature asphalt flue gas overflow causing the surrounding green vegetation to be scorched or even die, and completely reduces the concentration, temperature, and speed of asphalt flue gas to a minimum.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An asphalt fume recovery system, characterized in that, The system includes an installation body (1), with a heating chamber (2) below the installation body (1) for accommodating an asphalt mixture pile (21); a flue gas recovery device (3) communicating with the heating chamber (2) is provided inside the installation body (1), the flue gas recovery device (3) includes a main flue gas recovery chamber (31), and auxiliary flue gas recovery hoods (32) are provided on both sides of the installation body (1). A first fireproof cloth (37) is provided between the main flue gas recovery chamber (31) and the auxiliary flue gas recovery hoods (32), the first fireproof cloth (37) being used to block asphalt fumes from diffusing outward from the main flue gas recovery chamber (31); a... A sealing mesh (39) is used to filter asphalt fumes; the main flue gas recovery chamber (31) and the auxiliary flue gas recovery hood (32) are connected to the dust removal and degradation chamber (33), and the dust removal and degradation chamber (33), the fan (34) and the hot air furnace (35) are connected in sequence by pipelines; the main flue gas recovery chamber (31) and the auxiliary flue gas recovery hood (32) collect the asphalt fumes in the heating chamber (2); after the asphalt fumes are dusted by the dust removal and degradation chamber (33), they are sent into the hot air furnace (35) by the fan (34) for combustion, and the heat generated by the combustion of the asphalt fumes in the hot air furnace (35) is used to heat the chamber (2) to increase the temperature of the asphalt mixture pile (21).

2. The asphalt fume recovery system according to claim 1, characterized in that, The main flue gas recovery chamber (31) and the auxiliary flue gas recovery hood (32) are symmetrically distributed on both sides of the heating chamber (2); the top of the mounting body (1) is provided with an annular circulation channel (36), one side of the annular circulation channel (36) is connected to the main flue gas recovery chamber (31) and the auxiliary flue gas recovery hood (32), and the other side of the annular circulation channel (36) is connected to the dust removal and degradation chamber (33).

3. The asphalt fume recovery system according to claim 1, characterized in that, The first fireproof cloth (37) is fixed to the mounting body (1) by the first baffle (38).

4. The asphalt fume recovery system according to claim 1, characterized in that, The auxiliary flue gas recovery hood (32) is provided with a second fireproof cloth (371) on the side away from the main flue gas recovery chamber (31). The second fireproof cloth (371) is used to block asphalt fumes from spreading outward from the auxiliary flue gas recovery hood (32). The second fireproof cloth (371) is fixed to the auxiliary flue gas recovery hood (32) by a second baffle (381).

5. The asphalt fume recovery system according to claim 1, characterized in that, The sealing mesh (39) is rotatably connected to the bottom of the mounting body (1).

6. The asphalt fume recovery system according to claim 1, characterized in that, The auxiliary flue gas recovery hood (32) is configured in the shape of a funnel, with its wide opening facing downwards and flush with the bottom of the mounting body (1).

7. A hot air temperature raising machine, characterized in that, The vehicle includes a vehicle body and an asphalt fume recovery system as described in any one of claims 1 to 6. A material distribution device (4) is provided at the front of the vehicle body, and a material collection device (5) is provided at the rear of the vehicle body. Multiple asphalt fume recovery systems are provided between the material distribution device (4) and the material collection device (5), and a front insulation box (6) is provided between two adjacent asphalt fume recovery systems.

8. A hot air temperature raising machine according to claim 7, characterized in that, The front insulation box (6) includes a front end (61), a middle section (62) and a rear section (63). The wide opening of the front end (61) is connected to the outlet of the asphalt fume recovery system in front. The narrow opening of the front end (61) is connected to the middle section (62). The middle section (62) and the rear section (63) are hinged and fixed. The outlet of the rear section (63) is connected to the inlet of the asphalt fume recovery system behind.

9. A hot air temperature raising machine according to claim 8, characterized in that, The material collection device (5) is hinged to a rear insulation box (7) which has a trapezoidal cross-section and the inlet of the rear insulation box (7) is connected to the outlet of the material collection device (5).

10. A hot air temperature raising machine according to claim 7, characterized in that, The vehicle body is provided with protective devices (8) on both sides. The protective devices (8) are located outside the auxiliary flue gas recovery hood (32). The protective devices include multiple sets of protective plates (81) arranged side by side. The protective plates (81) are connected to the longitudinal support (82). The longitudinal support (82) is fixed to the vehicle body by a connecting rod support (83).

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