WO2021248925A1

WO2021248925A1 - High-reference hot mix plant recycling device

Info

Publication number: WO2021248925A1
Application number: PCT/CN2021/075415
Authority: WO
Inventors: 高国强; 潘泽源; 王俊峰; 马昆斌
Original assignee: 福建省铁拓机械股份有限公司
Priority date: 2020-06-12
Filing date: 2021-02-05
Publication date: 2021-12-16
Also published as: CN111851207A

Abstract

A high-reference hot mix plant recycling device, comprising a first recycling drying roller (1), a second recycling drying roller (2) and a hot air furnace (13) provided at intervals, the material feeding ends of the first recycling drying roller (1) and the second recycling drying roller (2) being sequentially connected to a primary settling chamber (20) and an exhaust gas treatment pipe (21), and the exhaust gas treatment pipe (21) communicating with the hot air furnace (13) by means of an air return pipe (22); a secondary settling chamber (24) is connected onto the exhaust gas treatment pipe (21); a first material discharging box (9) and a second material discharging box (10) on the first recycling drying roller (1) and the second recycling drying roller (2) communicate with a first air outlet pipe (11) and a second air outlet pipe (12) of the hot air furnace (13), respectively; heat generated by a burner (15) is transferred through the hot air furnace (13), and recycled coarse aggregate and fine aggregate are independently dried and heated by means of the first recycling drying roller (1) and the second recycling drying roller (2), respectively; the heated coarse aggregate is stored in a first hot material temporary storage bin (18) by means of the first material discharging box (9), and the heated fine aggregate is stored in a second hot material temporary storage bin (19) by means of the second material discharging box (10); and after being weighed by means of a recycling metering scale (16) according to grading requirements, the heated coarse and fine aggregates are simultaneously placed into a stirring cylinder (17) for stirring with virgin aggregate, so as to finally form a finished material that is up to standard. The device can control the heating temperature and can prevent aggregate aging.

Description

High-reference plant mixing hot regeneration equipment

Technical field

The invention relates to the technical field of asphalt mixture thermal regeneration equipment, in particular to a high-reference plant-mix thermal regeneration equipment.

Background technique

Asphalt mixture thermal regeneration technology is a technology for recycling waste asphalt mixtures. In the existing plant-mix thermal regeneration technology, various grades of cold waste asphalt mixtures are simultaneously sent to the drying and heating system for drying. After dry heating treatment, it is mixed with a certain proportion of new aggregate, asphalt, mineral powder, etc. to finally produce a qualified asphalt mixture finished material. However, this method of plant-mix thermal regeneration currently has the following problems:

1. The coarse and fine materials in the waste asphalt mixture enter the drying drum for heating at the same time. It is difficult to ensure the uniformity of the heating of the coarse and fine materials. Under the same environment, the fine aggregate is more likely to be heated than the coarse aggregate, so it is very easy to cause the fine material to be heated. The extremely high temperature during the heating process causes serious aging of the asphalt on the surface of the fine material; because the asphalt content in the fine material accounts for a large proportion of the waste asphalt mixture, once the asphalt of the fine material has aging problems, it will greatly reduce the waste asphalt mixture. The quality of the material ultimately affects the quality of the finished material.

2. The fine materials in the waste asphalt mixture are directly put into the mixing tank. This method has the following shortcomings. The fine materials are directly put into the mixing tank without being dried and heated and mixed with high-temperature virgin materials or recycled materials. , It will produce a lot of water vapor instantly, causing the negative pressure pipeline of the original equipment to be very easy to block, and it is very easy to cause the positive pressure in the mixing tank to be instantaneously, causing the soft connection part of the original equipment to fall off, and finally resulting in a large amount of dust and asphalt smoke. Pollution of the environment, threatening the safety of operators; and the amount of fine materials added is very limited. If a large amount of fine materials that have not been dried and heated are added to the mixing tank, the quality of the finished materials will be affected;

3. There is a way to put fine materials into the mixing tank through a conveying device (such as screw conveying, etc.) that can realize the preheating function. Although this method can effectively alleviate the problems caused by the direct input of cold materials into the mixing tank, because of the screw The space of the conveying device is small, and the fine material is not easy to form heat exchange inside, so this method cannot realize the fine material addition with a higher output, and thus cannot realize the high reference function of the recycled material.

Summary of the invention

(1) Technical problems to be solved

In order to solve the above-mentioned problems of the prior art, the present invention provides a high-reference plant mixing heat regeneration equipment, which has simple operation, good effect, practicality, compact structure, energy saving and environmental protection, and convenient installation and maintenance.

(2) Technical solution

In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

A high-reference plant mixing heat regeneration equipment, comprising a first regeneration drying drum, a second regeneration drying drum and a hot air furnace arranged at intervals, the first regeneration drying drum and the second regeneration drying drum are The first discharging box and the second discharging box are respectively communicated with the first air outlet pipe and the second air outlet pipe of the hot blast furnace;

The feed ends of the first regenerative drying drum and the second regenerative drying drum are connected with a first-stage sedimentation chamber, and the first-stage sedimentation chamber is connected with a tail gas treatment pipeline, and the tail gas treatment pipeline is connected to the hot blast furnace through a return air pipe A return air blower is connected between the tail gas processing pipeline and the return air pipe; a secondary settling chamber is connected to the tail gas processing pipeline;

The heat required to dry the coarse aggregate and the fine aggregate is generated by the burner and transferred through the hot blast furnace. A part of the hot gas directly enters the first regeneration drying drum through the first air outlet pipe to exchange heat with the coarse aggregate. Another part of the hot air can enter the second regeneration drying drum through the second air outlet pipe to exchange heat with the fine aggregate;

After the exhaust gas generated by the first regeneration drying drum and the second regeneration drying drum is processed by the primary sedimentation chamber, the exhaust gas treatment pipeline and the secondary sedimentation chamber, a part of the exhaust gas is sent to the original drying drum through the exhaust fan. After the secondary combustion process, the other part enters the hot blast furnace through the return air pipe and mixes with the flame of the burner to generate hot air to provide heat to the first regeneration drying drum and the second regeneration drying drum;

The recycled coarse aggregate and fine aggregate are separately dried and heated by the first regeneration drying drum and the second regeneration drying drum. The heated coarse aggregate is stored in the first hot material temporary storage bin through the first discharge box. , The heated fine aggregate is stored in the second hot material temporary storage bin through the second discharge box. According to the grading requirements, the coarse aggregate and the fine aggregate can be weighed in the regeneration weighing scale. Finally, At the same time, put it into the mixing tank and mix with the original aggregate to form a qualified finished material.

Further, the feeding end of the first regeneration drying drum is connected to the discharge end of the recycled coarse aggregate hoist; the feeding end of the recycled coarse aggregate hoist is connected to the belt conveyor of the recycled coarse aggregate. The discharge end is connected; the feeding end of the recycled coarse aggregate belt conveyor is matched with the recycled coarse aggregate silo.

Further, the feed end of the second regeneration drying drum is communicated with the discharge end of the regeneration fine aggregate hoist; the feed end of the regeneration fine aggregate hoist is connected to the belt conveyor of the regeneration fine aggregate. The discharge end is connected; the feeding end of the recycled fine aggregate belt conveyor is matched with the recycled fine aggregate silo.

Further, the first air outlet pipe and/or the second air outlet pipe are provided with a regulating air door.

Further, the secondary settling chamber is communicated with the feed end of the recycled fine aggregate hoist through a recycled powder pipeline.

(3) Beneficial effects

The beneficial effects of the present invention are as follows: 1. The coarse and fine materials can be separately heated, and the coarse and fine materials are dried and heated by independent regeneration drying drums. It is easier to control the temperature of the coarse and fine materials, especially the control of the fine materials, and the regeneration is controlled by frequency conversion. The rotation speed of the drying drum can be selected to control the amount of fine aggregate addition, and the size of the air door can be adjusted in coordination to effectively ensure the discharge temperature of the fine aggregate. The coarse and fine materials can be controlled by double drums. Separate heating can effectively control the discharge temperature of the recycled coarse material and the recycled fine material, thereby effectively increasing the output of the recycled material and realizing the high reference of the recycled material. 2. The fine materials filtered and settled in the primary sedimentation chamber and secondary sedimentation chamber can be recycled and reused to reduce the external discharge of solid particles, thereby reducing environmental pollution; 3. By measuring the coarse and fine materials separately, it can greatly Improve the grading accuracy of coarse and fine materials, especially to meet the gradation control requirements of fine aggregates, thereby ensuring the grading requirements of finished materials; 4. The added function is integrated into the existing plant mixing heat regeneration equipment, with compact structure, installation and maintenance convenient.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the present invention.

detailed description

In order to better explain the present invention and facilitate understanding, the following describes the present invention in detail through specific embodiments in conjunction with the accompanying drawings.

A high-reference plant mixing heat regeneration equipment, as shown in Figure 1, includes a first regeneration drying drum 1 and a second regeneration drying drum 2 arranged at intervals, and the feed of the first regeneration drying drum 1 The end is connected with the discharge end of the recycled coarse aggregate elevator 3; the feed end of the recycled coarse aggregate elevator 3 is connected with the discharge end of the recycled coarse aggregate belt conveyor 4; The feed end of the belt conveyor 4 is matched with the recycled coarse aggregate silo 5; the feed end of the second regeneration drying drum 2 is connected to the discharge end of the recycled fine aggregate elevator 6; The feed end of the recycled fine aggregate hoist 6 is communicated with the discharge end of the recycled fine aggregate belt conveyor 7; the feed end of the recycled fine aggregate belt conveyor 7 is opposite to the recycled fine aggregate silo 8 Cooperate.

Specifically, the first discharge box 9 and the second discharge box 10 on the first regeneration drying drum 1 and the second regeneration drying drum 2 are respectively connected to the first outlet pipe 11 and the second outlet pipe 11 of the hot blast furnace 13 The air outlet pipe 12 is connected; the hot blast furnace 13 is connected to the burner 15; in order to facilitate the control of the air volume of the hot air, the first air outlet pipe 11 and/or the second air outlet pipe 12 are provided with a regulating air door 14.

Specifically, the first discharge box 9 and the second discharge box 10 are provided with a regenerative weighing scale 16 underneath the regenerative weighing scale 16 is provided with a stirring cylinder 17; in order to facilitate the heat dissipation of the heating material, The first discharging box 9 and the second discharging box 10 are respectively connected with a first hot material temporary storage bin 18 and a second hot material temporary storage bin 19, the first hot material temporary storage bin 18 and the second hot material temporary storage bin 18 The discharge end of the material temporary storage bin 19 is connected with the regeneration weighing scale 16.

Specifically, the feed ends of the first regeneration drying drum 1 and the second regeneration drying drum 2 are connected with a primary sedimentation chamber 20, and the primary sedimentation chamber 20 is connected with a tail gas treatment pipeline 21 and a tail gas treatment pipeline 21. The upper part is communicated with the hot blast furnace 13 through a return air pipe 22; a return air blower 23 is connected between the exhaust gas treatment pipeline 21 and the return air pipe 22.

Further, because the tail gas in the tail gas treatment pipeline 21 contains particulate matter, the tail gas treatment pipeline 21 is connected with a secondary settling chamber 24, and the secondary settling chamber 24 is connected to the recycled fine aggregate through the powder recovery pipeline 25 The feeding end of the hoist 6 is connected.

Further, in order to reuse the generated exhaust gas, a smoke exhaust fan 26 is connected to the exhaust gas treatment pipeline 21, and the exhaust end of the smoke exhaust fan 26 is in communication with the original drying drum.

In this embodiment, the recycled coarse aggregate and the fine aggregate are separately dried and heated by the first regeneration drying drum 1 and the second regeneration drying drum 2 respectively, and the heated coarse aggregate is stored in the first thermal material temporary storage bin In 18, the heated fine aggregate is stored in the second hot material temporary storage bin 19. According to the grading requirements, the coarse aggregate and the fine aggregate can be weighed in the regenerating weighing scale 16, and finally put in at the same time. The mixing tank 17 is mixed with the raw aggregates and the like, and finally a qualified finished material is formed.

In this embodiment, the heat required to dry the coarse aggregate and the fine aggregate is generated by the burner 15 and transferred through the hot blast furnace 13, and part of the hot gas directly enters the first regeneration drying drum 1 through the first air outlet pipe 11 The internal heat exchange with the coarse aggregate, the other part of the hot air can enter the second regenerative drying drum 2 through the second air outlet pipe 12 to exchange heat with the fine aggregate. The second air outlet pipe 12 is equipped with a regulating air door 14, which can be Control the heat flow entering the second regeneration drying drum 2. The second regeneration drying drum 2 can control the drum speed by frequency conversion, select the appropriate drum speed according to the amount of fine material, and cooperate with the adjusting damper 14 to control the fine material discharge temperature.

In this embodiment, after the exhaust gas generated by the first regeneration drying drum 1 and the second regeneration drying drum 2 is processed by the primary sedimentation chamber 20, the exhaust gas treatment pipeline 21 and the secondary sedimentation chamber 24, a part of the exhaust gas passes through the exhaust fan 26. The tail gas is sent into the primary drying drum for secondary combustion treatment, and the other part enters the hot blast furnace 13 through the return air pipe 22 and mixes with the flame of the burner 15 to generate hot air for the first regeneration drying drum 1 and the second regeneration. The drying drum 2 provides heat.

In this embodiment, the coarse and fine materials can be heated separately, and the coarse and fine materials are dried and heated by independent regeneration drying drums. It is easier to control the temperature of the coarse and fine materials, especially the control of the fine materials. The rotation speed of the regeneration drying drum is controlled by frequency conversion. Therefore, it is possible to select the size of the finer aggregate addition to control the different speeds, and adjust the size of the damper, so as to effectively ensure the discharge temperature of the fine aggregate, and the coarse and fine materials are separately heated by the double rollers, which can be effective Control the discharge temperature of the recycled coarse material and the recycled fine material, thereby effectively increasing the output of the recycled material and realizing the high reference of the recycled material.

This embodiment can recycle and reuse the fine materials filtered and settled in the primary sedimentation chamber and secondary sedimentation chamber, reducing the external discharge of solid particles, thereby reducing environmental pollution; by separately measuring the coarse and fine materials, it can greatly improve The grading accuracy of coarse and fine materials, especially to meet the gradation control requirements of fine aggregates, so as to ensure the grading requirements of finished materials; the added function is integrated in the existing plant mixing heat regeneration equipment, with compact structure and convenient installation and maintenance.

The foregoing descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

A high-reference plant mixing heat regeneration equipment, which is characterized in that it comprises a first regeneration drying drum (1), a second regeneration drying drum (2) and a hot blast furnace (13) arranged at intervals. The first discharge box (9) and the second discharge box (10) on the regeneration drying drum (1) and the second regeneration drying drum (2) are respectively connected to the first outlet pipe ( 11) Connect with the second air outlet pipe (12);

The feed ends of the first regeneration drying drum (1) and the second regeneration drying drum (2) are connected with a primary sedimentation chamber (20), and the primary sedimentation chamber (20) is connected with an exhaust gas treatment pipeline (21) ), the tail gas treatment pipeline (21) is connected to the hot blast furnace (13) through a return air pipe (22); a return air fan ( 23); The tail gas treatment pipeline (21) is connected with a secondary settling chamber (24);

The heat required for drying coarse and fine aggregates is generated by the burner (15) and is transferred through the hot blast furnace (13), and part of the hot air directly enters the first regeneration drying drum through the first air outlet pipe (11) (1) The internal heat exchange with the coarse aggregate, and the other part of the hot air can enter the second regeneration drying drum (2) through the second air outlet pipe (12) to exchange heat with the fine aggregate;

After the exhaust gas generated by the first regeneration drying drum (1) and the second regeneration drying drum (2) is processed by the primary sedimentation chamber (20), the exhaust gas treatment pipeline (21) and the secondary sedimentation chamber (24), part of The exhaust gas passes through the exhaust fan (26) to send the exhaust gas into the original drying drum for secondary combustion treatment, and the other part enters the hot blast furnace (13) through the return air pipe (22) to mix with the flame of the burner (15) to produce The hot air provides heat to the first regeneration drying drum (1) and the second regeneration drying drum (2);

The recycled coarse aggregate and fine aggregate are separately dried and heated by the first regeneration drying drum (1) and the second regeneration drying drum (2), and the heated coarse aggregate is stored in the first discharge box (9) In the first hot material temporary storage bin (18), the heated fine aggregates are stored in the second hot material temporary storage bin (19) through the second discharge box (10), and can be adjusted separately according to the grading requirements. Coarse aggregates and fine aggregates are weighed in a regenerated weighing scale (16), and finally put into the mixing tank (17) at the same time and mixed with the original aggregates to form a qualified finished product.
The high-reference plant-mix thermal regeneration equipment according to claim 1, wherein the feed end of the first regeneration drying drum (1) and the output of the recycled coarse aggregate hoist (3) The feed end of the recycled coarse aggregate hoist (3) is connected with the discharge end of the recycled coarse aggregate belt conveyor (4); the recycled coarse aggregate belt conveyor (4) The feed end is matched with the recycled coarse aggregate silo (5).
The high-reference plant-mix thermal regeneration equipment according to claim 1, wherein the feed end of the second regeneration drying drum (2) and the output of the regeneration fine aggregate hoist (6) The feed end of the regenerated fine aggregate hoist (6) is connected to the discharge end of the regenerated fine aggregate belt conveyor (7); the regenerated fine aggregate belt conveyor (7) The feed end is matched with the regenerated fine aggregate silo (8).
The high-reference plant mixing heat regeneration equipment according to claim 1, characterized in that, the first air outlet pipe (11) and/or the second air outlet pipe (12) are provided with a regulating damper (14) ).
The high-reference plant mixing heat regeneration equipment according to claim 3, characterized in that, the secondary settling chamber (24) is fed by the recycled powder pipeline (25) and the recycled fine aggregate elevator (6). The material ends are connected.