WO2013091421A1

WO2013091421A1 - Thermal regeneration equipment and combustion device for asphalt mixture

Info

Publication number: WO2013091421A1
Application number: PCT/CN2012/082092
Authority: WO
Inventors: 尹友中; 张俊; 丁伊章; 代五祥; 员键
Original assignee: 中联重科股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2011-12-20
Filing date: 2012-09-26
Publication date: 2013-06-27
Also published as: CN102518020B; CN102518020A

Abstract

Thermal regeneration equipment (1) and a combustion device for asphalt mixture. The combustion device comprises a combustor (20) and a draft tube (30) sleeved on a nozzle (21) of the combustor (20); the draft tube (30) is used for guiding flame generated by the combustor (20) and for introducing cooling gas to form a layer of high-speed gas curtain around an outer ring of the flame. The draft tube (30) is added to the combustion device for introducing the cooling gas to form a layer of high-speed gas curtain around the outer ring of the flame, hence reducing radiation aging of an object being heated by high-temperature flame.

Description

Asphalt mixture heat regeneration equipment and combustion device

Technical field

The present invention relates to a combustion apparatus, and more particularly to a combustion apparatus for a thermal regeneration apparatus. Background technique

The thermal regeneration of the asphalt mixture is to break the old asphalt pavement, after milling, dig, and crushing to form the old asphalt mixture, and then heat regeneration. Finally, according to a certain mix ratio, new asphalt, aggregate and other materials are stirred to form a new asphalt mixture. During the heating and regeneration process of old asphalt materials, there are problems of high temperature aging and asphalt smoke emission. Summary of the invention

The present invention is directed to an improved asphalt mixture thermal regeneration apparatus and combustion apparatus.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

Provided is a combustion apparatus comprising a burner and a draft tube sleeved on a spout of the burner, the guide tube for guiding a flame generated by the burner, and for introducing a cooling gas in the The outer ring of the flame forms a high-speed air curtain.

Preferably, the guide tube includes one end sleeved on the burner spout and the other end opposite the one end, and the air curtain is formed on the burner from the other side of the draft tube The flame emerges from the outer ring at one end.

Preferably, the draft tube includes an inner cylinder that is sleeved at one end of the burner and an annular chamber that surrounds the outer cylinder, the annular chamber includes an air inlet and an air outlet, The air outlet is annular and surrounds the end of the inner cylinder away from the burner to form the air curtain at a flame outer ring of the burner emerging from the other end of the inner cylinder.

Preferably, the direction of the air outlet is parallel to the flame guiding direction of the inner cylinder.

Preferably, the guide tube comprises an outer cylinder sleeved outside the inner cylinder, and an inner wall surface of the outer cylinder and an outer wall surface of the inner cylinder define the annular chamber.

Preferably, the annular chamber is closed adjacent to one side of the burner, open to a side remote from the burner, and the open side forms the air outlet.

Preferably, the air inlet is opened on the outer cylinder.

There is also provided an asphalt mixture thermal regeneration apparatus comprising a drying drum, a burner, and a guide tube disposed between the drying drum and the burner, the draft tube for using the burner The generated flame is introduced into the drying drum and used to introduce a cooling gas to form a high velocity air curtain on the outer ring of the flame. Preferably, the guide tube includes one end sleeved on the burner nozzle and the other end opposite to the one end and extending into the drying drum, the air curtain being formed on the burner From the outer circumference of the flame emerging from the other end of the draft tube.

Preferably, the guide tube comprises an inner cylinder and an annular chamber surrounding the inner cylinder; the inner cylinder is sleeved on the nozzle of the burner and the other end is inserted into the drying drum; The annular chamber includes an air inlet and an air outlet, the air outlet is annular and surrounds the other end of the inner cylinder to flame the burner from the other end of the inner cylinder The outer ring forms the air curtain.

Preferably, the air inlet is opened on the outer cylinder.

Preferably, the asphalt mixture heat regeneration apparatus further includes an exhaust gas introduction pipe connected to the air inlet, the exhaust gas introduction pipe for introducing the exhaust gas discharged from the drying drum into the annular chamber.

Preferably, both ends of the exhaust gas introduction duct are respectively connected to the air inlet and the cigarette case at the tail of the drying drum.

Compared with the related art, since the introduction of the cooling gas by the introduction of the cooling gas forms a high-speed air curtain on the outer circumference of the flame, the radiation aging of the object to be heated by the high temperature flame can be reduced. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a partial structural schematic view of an asphalt mixture thermal regeneration apparatus in some embodiments of the present invention.

Fig. 2 is a cross-sectional view showing the A-A direction of the draft tube shown in Fig. 1. detailed description

The present invention will be further described in detail below in conjunction with the specific embodiments and the accompanying drawings.

1 shows an asphalt mixture thermal regeneration apparatus 1 in some embodiments of the invention, which may include a drying drum 10, a combustor 20, and a draft tube 30. The guide tube 30 is disposed between the drying drum 10 and the burner 20, one end of which is sleeved on the nozzle 21 of the burner 20, and the other end of which is inserted into the drying drum for introducing the flame generated by the burner 20. The old asphalt material in the drying drum 10 is heated in the drying drum 10. The guide tube 30 is also used to introduce cooling gas The body forms a high-speed air curtain at the outer circumference of the burner 20 emerging from the other end of the draft tube 30 to reduce the radiation aging of the old asphalt by the high temperature flame. The burner 20 and the draft tube 30 cooperate to form a combustion device that reduces the risk of high temperature flame radiation.

As shown in Figures 1 and 2, the draft tube 30 can, in some embodiments, include an inner barrel 31 and an annular chamber 33 surrounding the inner barrel 31. The inner barrel 31 can be cylindrical in some embodiments and The inner cylinder 31 is sleeved on the nozzle 21 of the burner 20, and the other end is inserted into the drying drum 10 to introduce the flame generated by the burner 20 to the drying drum 10. in. The annular chamber 33 includes an air inlet 330 and an air outlet 332. The air outlet 332 is annular and surrounds the other end of the inner cylinder 31 and communicates with the inside of the drying drum 10 to take the burner 20 from the other end of the inner cylinder 31. The outer ring of flame forms the above air curtain.

The annular chamber 33 is for introducing high-speed cooling gas from the air inlet 330, and discharging the cooling gas from the air outlet 332 into the drying drum 10. In one aspect, the inner cylinder 31 can be cooled and protected by the introduced cooling gas, and the inner cylinder 31 is extended. The service life of the cylinder 31; on the other hand, the cooling gas can form a high-speed air curtain on the outer ring of the flame to reduce the radiation aging of the old asphalt material by the high temperature flame. Preferably, the direction of the air outlet 330 of the annular chamber 33 (as indicated by an arrow B in FIG. 1) is parallel to the flame guiding direction of the inner cylinder 31 (shown by an arrow C in FIG. 1) to form a cooling gas. The curtain matches the flame better. In some embodiments, the direction of the air outlet 330 of the annular chamber 33 and the direction of flame guidance of the inner cylinder 31 coincide with the direction of discharge of the burner 20.

In some embodiments, the draft tube 30 further includes an outer cylinder 35 sleeved outside the inner cylinder 31. The outer cylinder 35 may also have a cylindrical shape, and the inner diameter thereof is larger than the outer diameter of the inner cylinder 31, and the inner cylinder 35 is inside. The wall surface and the outer wall surface of the inner cylinder 31 define the annular chamber 33 described above. In some embodiments, the inner cylinder 31 is coaxially nested with the outer cylinder 35 to provide uniform thickness of the annular chamber 33. It can be understood that, in some embodiments, the inner cylinder 31 and the outer cylinder 35 may also be sleeved together without being coaxially, but correspondingly adjusted according to the position of the air inlet 330, so that the gas pressure of the air outlet 332 is discharged circumferentially. Relatively uniform.

As further shown, in some embodiments, the side of the annular chamber 33 adjacent the burner 20 is closed by an annular sealing plate 37, and the side remote from the burner 20 is open, the open side forming an air outlet 332. . The air inlet of the annular chamber 33 is opened on the outer cylinder 35 to introduce the cooling gas from the radial direction into the annular chamber 33. The annular seal plate 37 also partially closes the inner cylinder 31 near one end of the burner 20 and is sleeved on the spout 21 of the burner 20 to connect the inner cylinder 31 to the burner 20.

In some embodiments, the asphalt mixture heat regeneration apparatus 1 may further include an exhaust gas introduction duct 40 connected to the air inlet 330 of the annular chamber 33 for using the exhaust gas discharged from the drying drum 10 as a cooling gas. Introduced into the annular chamber 33, the temperature of the exhaust gas is about 13 CTC in some embodiments, The effect of the inner cylinder 31 is now cooled. In some embodiments, the two ends of the exhaust gas introduction duct 40 are respectively connected to the air inlet 330 and a smoke box (not shown) disposed at the tail of the drying drum 10.

Understandably, since the old asphalt material is heated and regenerated, when the temperature of the asphalt rises to a certain extent and comes into contact with water vapor, a "distillation" effect is generated, and a large amount of asphalt smoke is generated, which is also called "blue smoke". This bitumen smoke contains a carcinogen, benzopyrene. These bituminous fumes are mixed in the exhaust gas discharged from the drying drum 10, and if they are directly discharged, they are bound to cause damage to the environment. The above-mentioned asphalt mixture heat regeneration device 1 uses the exhaust gas of the drying drum 10 as the cooling inner cylinder 31 and the cooling gas forming the air curtain, and one aspect thereof can directly use the air blower for exhaust gas discharge (not shown) to directly guide the air guide tube. 30 gas supply, saving extra gas supply system; on the other hand, the asphalt smoke in the exhaust gas can be burned in the flame, which reduces the emission of harmful gases, saves a lot of energy, and has significant environmental protection and economic benefits.

It will also be appreciated that in some embodiments, the burner 20 and the burner 30 constitute a combustion apparatus that is not limited to use in the asphalt mixture thermal regeneration apparatus 1, and that may be applied to other equipment requiring similar functions. .

The above description is only a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, and all the technical solutions under the inventive concept belong to the protection scope of the present invention. It should be noted that those skilled in the art will be able to devise a number of modifications and refinements without departing from the principles of the invention.

Claims

Rights request

A combustion apparatus comprising a burner, characterized in that the combustion apparatus further comprises a draft tube sleeved on a spout of the burner, the guide tube being used for guiding the burner to generate The flame, and for introducing a cooling gas, forms a high velocity air curtain on the outer ring of the flame.

2. The combustion apparatus according to claim 1, wherein the flow guide tube includes one end that is sleeved on the burner nozzle and the other end opposite to the one end, and the air curtain is formed in the The burner is on the outer circumference of the flame emerging from the other end of the draft tube.

3. The combustion apparatus according to claim 1 or 2, wherein the guide tube comprises an inner cylinder that is sleeved at one end of the burner and an annular chamber that surrounds the outer cylinder The annular chamber includes an air inlet and an air outlet, the air outlet is annular and surrounds the inner cylinder away from an end of the burner to take the burner from the other end of the inner cylinder The outer ring of flame forms the air curtain.

4. The combustion apparatus according to claim 3, wherein the guide tube comprises an outer cylinder sleeved outside the inner cylinder, and an inner wall surface of the outer cylinder and an outer wall surface of the inner cylinder are defined Out of the annular chamber.

5. The combustion apparatus according to claim 4, wherein the annular chamber is closed near a side of the burner, and a side away from the burner is open, the open side forming the outlet tuyere.

The combustion apparatus according to claim 5, wherein the air inlet is opened on the outer cylinder.

7. An asphalt mixture thermal regeneration device, comprising a drying drum and a burner, wherein the asphalt mixture thermal regeneration device further comprises a diversion provided between the drying drum and the burner a canister for introducing a flame generated by the burner into the drying drum and for introducing a cooling gas to form a high-speed air curtain on the outer ring of the flame.

8. The asphalt mixture thermal regeneration apparatus according to claim 1, wherein the flow guiding tube comprises an end sleeved on the burner nozzle and opposite to the one end and extending into the baking At the other end of the dry drum, the air curtain is formed on a flame outer ring from which the burner emerges from the other end of the draft tube.

The asphalt mixture thermal regeneration device according to claim 7 or 8, wherein the guide tube comprises an inner cylinder and an annular chamber surrounding the inner cylinder; On the spout of the burner, the other end projects into the drying drum; the annular chamber includes an air inlet and an air outlet, the air outlet is annular and surrounds the other end of the inner cylinder, The air curtain is formed at a flame outer ring of the burner emerging from the other end of the inner cylinder.

The asphalt mixture thermal regeneration device according to claim 9, wherein the guide tube comprises an outer cylinder sleeved outside the inner cylinder, an inner wall surface of the outer cylinder and the inner cylinder The outer wall surface defines the annular chamber.

11. The asphalt mixture thermal regeneration apparatus according to claim 10, wherein the annular chamber is closed near a side of the burner, and a side away from the burner is open, the open side Forming the air outlet.

12. The asphalt mixture thermal regeneration apparatus according to claim 11, wherein the air inlet is opened on the outer cylinder.

The asphalt mixture heat regeneration device according to claim 9, wherein the asphalt mixture heat regeneration device further comprises an exhaust gas introduction pipe connected to the air inlet, wherein the exhaust gas introduction pipe is used for Exhaust gas discharged from the drying drum is introduced into the annular chamber.

The asphalt mixture heat regeneration device according to claim 13, wherein both ends of the exhaust gas introduction pipe are respectively connected to the air inlet and the smoke box at the tail of the drying drum.