CN214401302U

CN214401302U - Asphalt mixing system with heat exchange mechanism

Info

Publication number: CN214401302U
Application number: CN202120175969.8U
Authority: CN
Inventors: 时兆武
Original assignee: Shanghai Shishen Industry and Trade Co Ltd
Current assignee: Shanghai Shishen Industry and Trade Co Ltd
Priority date: 2021-01-21
Filing date: 2021-01-21
Publication date: 2021-10-15
Anticipated expiration: 2031-01-21
Also published as: JP3234410U; DE202021103905U1; KR20220001864U; KR200496385Y1

Abstract

The application relates to the technical field of asphalt concrete processing, in particular to an asphalt mixing system with a heat exchange mechanism, which comprises a heating mechanism, an aggregate prestoring mechanism, a reclaimed material prestoring mechanism, a powder prestoring mechanism, an asphalt prestoring mechanism, a stirring mechanism, a dust removing mechanism, a heat exchange mechanism and a waste gas treatment mechanism; the heat exchange mechanism comprises a first heat exchanger and a second heat exchanger, the first heat exchanger is provided with a first air inlet and a first air outlet for exchanging heat with a first heat exchange tube, two ends of the first heat exchange tube are respectively provided with a first water inlet and a first water outlet, the second heat exchanger is provided with a second air inlet, a second air outlet and a second heat exchange tube, the second air outlet is communicated with the combustor, two ends of the second heat exchange tube are respectively provided with a second water inlet and a second water outlet, the first water outlet is communicated with the second water inlet, and the second water outlet is communicated with the first water inlet. The application can reduce the loss of fuel combustion heat in the combustor and has the advantages of saving and protecting the environment.

Description

Asphalt mixing system with heat exchange mechanism

Technical Field

The application relates to the technical field of asphalt concrete processing, in particular to an asphalt mixing system with a heat exchange mechanism.

Background

The asphalt concrete is commonly called as asphalt concrete, and is a mixture prepared by manually selecting mineral aggregate with a certain gradation composition, broken stone or crushed gravel, stone chips or sand, mineral powder and the like, and mixing the mineral aggregate, the broken stone or crushed gravel, the stone chips or sand, the mineral powder and a certain proportion of road asphalt material under strictly controlled conditions. The asphalt concrete pavement has good driving comfort and excellent performance, and has the advantages of high construction speed, low maintenance cost and the like, and is widely used. The hot-mixed asphalt mixture is the main method for constructing the current asphalt concrete pavement.

In the process of hot-mixing asphalt, an asphalt mixing system comprises a heating mechanism, a stirring mechanism, a dust removal mechanism, a waste gas treatment mechanism and the like, the natural aggregate and the recycled aggregate are heated by the heating mechanism, the heating mechanism comprises a drying cylinder, a burner is arranged at the bottom of the drying cylinder, air needs to be introduced from an air inlet of the burner to support combustion when the burner is used for heating, so that the natural aggregate and the recycled aggregate are heated, and the temperature of the heated aggregate is up to more than 200 ℃. The aggregate is heated and then enters the stirring mechanism along with hot air, after the mixing is finished, the hot air is absorbed by the dust removal mechanism along with dust, and the hot air after dust removal is discharged into the waste gas treatment mechanism for treatment and discharge.

In view of the above-mentioned related art, when air is introduced into the air inlet of the combustor, the temperature of the air is low, so that part of heat generated by fuel combustion is absorbed by the air, thereby causing waste of resources.

SUMMERY OF THE UTILITY MODEL

In order to improve the rate of utilization of heat in the combustor, the energy saving, this application provides an asphalt mixing system with heat transfer mechanism.

The application provides a pair of pitch mix system with heat transfer mechanism adopts following technical scheme:

an asphalt mixing system with a heat exchange mechanism comprises a heating mechanism, an aggregate prestoring mechanism, a reclaimed material prestoring mechanism, a powder prestoring mechanism, an asphalt prestoring mechanism, a stirring mechanism, a dust removing mechanism, a heat exchange mechanism and a waste gas treatment mechanism;

the heating mechanism comprises a drying cylinder, a first feeding hole is formed in the top of the drying cylinder, a first discharging hole and a burner are formed in the bottom of the drying cylinder, an air inlet of the burner is formed in the bottom of the burner, and the output end of the burner is communicated with the drying cylinder;

the heat exchange mechanism comprises a first heat exchanger and a second heat exchanger, the first heat exchanger is provided with a first air inlet and a first air outlet, the first air inlet is communicated with the dust removal mechanism, the first air outlet is communicated with the waste gas treatment mechanism, a first heat exchange tube is arranged in the first heat exchanger, a first water inlet and a first water outlet are respectively arranged at two ends of the first heat exchange tube, the first water inlet and the first water outlet are both arranged by penetrating through the side wall of the first heat exchanger, the second heat exchanger is provided with a second air inlet and a second air outlet, air is introduced into the second air inlet, the second air outlet is communicated with the air inlet of the burner, a second heat exchange tube is arranged in the second heat exchanger, a second water inlet and a second water outlet are respectively arranged at two ends of the second heat exchange tube, and the second water inlet and the second water outlet are both arranged by penetrating through the side wall of the second heat exchanger, the first water outlet is communicated with the second water inlet, the second water outlet is communicated with the first water inlet, a water return pump is arranged between the first water outlet and the second water inlet in a communicated mode, and a water control assembly is arranged between the second water outlet and the first water inlet in a communicated mode.

By adopting the technical scheme, the aggregate is heated by the heating mechanism, a large amount of hot air is generated, the hot air enters the asphalt mixing system along with the conveying of raw materials, when finished products are loaded, dust enters the dust removal mechanism for dust removal, the hot air after dust removal enters the first heat exchanger and contacts with the first heat exchange pipe, the hot air enters the waste gas treatment mechanism after the temperature of the hot air is reduced, meanwhile, the hot air is influenced by the hot air, water in the first heat exchange pipe flows into the second heat exchange pipe after being heated, the air introduced into the second heat exchanger contacts with the second heat exchange pipe and is heated, so that the temperature of the air introduced into the combustor is increased, the waste of fuel combustion heat is reduced, the heating efficiency is improved, and the energy conservation and environmental protection are facilitated.

Preferably, the first heat exchange tube and the second heat exchange tube are both arranged as coil tubes.

By adopting the technical scheme, the contact area between the heat exchange tube and air is increased, so that the heat exchange efficiency is improved, and the energy conservation and environmental protection are facilitated.

Preferably, the water control assembly comprises a water replenishing pipe, a water discharging pipe and a water replenishing tank, the water replenishing pipe and the water discharging pipe are both communicated with a communication channel between the second water outlet and the first water inlet, a water replenishing pump is communicated with the water replenishing pipe, the water replenishing pipe is communicated with the water replenishing tank through the water replenishing pump, a water discharging pump is communicated with the water discharging pipe, and the water discharging pipe is communicated with the water replenishing tank through the water discharging pump.

By adopting the technical scheme, the flow of water in the heat exchange mechanism can be conveniently controlled, and the quantity of circulating water between the first heat exchanger and the second heat exchanger can be properly increased or reduced according to needs.

Preferably, the drying cylinder is provided with a double-layer cylinder, and an outer cylinder of the drying cylinder is communicated with a second feeding hole and a second discharging hole.

Through adopting above-mentioned technical scheme, contain old and useless pitch in the reworked material, use the combustor directly to carry out the in-process that heats to the reworked material, can produce a large amount of abandonment pitch flue gases, bring the influence to staff healthy, and the contaminated air, through setting up the section of thick bamboo of drying into the bilayer, use the urceolus to heat the reworked material, avoided the direct contact of naked light with the reworked material to reduce the production of abandonment pitch flue gas, be favorable to guaranteeing staff's healthy and environmental protection.

Preferably, aggregate prestore mechanism has set gradually aggregate lifting machine, aggregate screening machine, aggregate along defeated material direction and stores storehouse, aggregate measurement storehouse and first storehouse of storing, aggregate lifting machine and first discharge gate intercommunication, first storehouse and rabbling mechanism intercommunication are stored.

Through adopting above-mentioned technical scheme, natural aggregate heats the back at heating mechanism, gets into aggregate and prestores the mechanism, and the aggregate prestores the mechanism and sieves the natural aggregate after the heating to store the storehouse in the aggregate heat preservation and store, when the production was used, the natural aggregate got into first storage storehouse after weighing through aggregate measurement storehouse, then got into the rabbling mechanism stirring, made natural aggregate can be accurate, high-efficient use.

Preferably, the reclaimed material prestores the mechanism and has set gradually the reclaimed material lifting machine, reclaimed material along defeated material direction and store storehouse, reclaimed material measurement storehouse and second and store the storehouse, the reclaimed material lifting machine communicates with the second discharge gate, storehouse and rabbling mechanism intercommunication are stored to the second.

Through adopting above-mentioned technical scheme, the regeneration aggregate is after heating mechanism heats, gets into the regeneration from the ejection of compact of second discharge gate and prestores the mechanism, and the regeneration material is after weighing in the regeneration material measuring bin, gets into the second and stores the storehouse in reserve, then gets into the rabbling mechanism stirring, has realized prestoring and weighing to the heating back regeneration material.

Preferably, the asphalt pre-storage mechanism sequentially comprises an asphalt storage bin, an asphalt metering bin and a fourth storage bin along the conveying direction, and the fourth storage bin is communicated with the stirring mechanism.

Through adopting above-mentioned technical scheme, pitch prestore mechanism has realized weighing, prestoring to the pitch raw materials to be convenient for follow-up in-process pitch raw materials and the mixture of other raw materials.

Preferably, the powder prestore mechanism is provided with the powder in proper order along defeated material direction and stores storehouse, material powder measuring bin and third storage storehouse, the storehouse is stored to the powder and dust removal mechanism intercommunication, the third is stored the storehouse and is communicated with rabbling mechanism.

Through adopting above-mentioned technical scheme, through the recovery to the dust, realized the cyclic utilization of resource, be favorable to practicing thrift the cost, prestore the mechanism with the dust weigh, store in the powder, be convenient for follow-up stirring in-process powder raw materials's addition.

Preferably, the stirring mechanism is sequentially provided with a continuous stirring cylinder, a pre-stirring storage bin, a forced stirring cylinder and a finished product storage bin along the conveying direction, the continuous stirring cylinder is communicated with the first storage bin, the second storage bin, the third storage bin and the fourth storage bin, the finished product material in the finished product storage bin is discharged to the finished product material conveying vehicle for feeding, dust generated in the discharging process is absorbed by the dust removing mechanism, the dust removing mechanism comprises a bag-type dust remover, the bag-type dust remover filters dust gas, the dust is discharged to the powder storage bin, and waste gas enters the first heat exchanger from the first air inlet.

By adopting the technical scheme, the dust removing mechanism can recycle dust in the dust gas, so that the cyclic utilization of resources is realized. Aggregate, reclaimed materials, asphalt and dust are pre-stirred by the continuous stirring cylinder, the dispersibility of the raw materials in the system is improved, the pre-stirred raw materials are temporarily stored in a pre-stirring storage bin, then the pre-stirred raw materials are forcibly stirred by the forced stirring cylinder, the dispersibility of the raw materials in the system is further improved, and the quality of the mixture is improved.

Preferably, the waste gas treatment mechanism comprises a waste gas treatment tower, the gas inlet end of the waste gas treatment tower is communicated with the first gas outlet, and the treated purified gas is discharged from the gas outlet end of the waste gas treatment tower.

Through adopting above-mentioned technical scheme, waste gas is handled with waste gas in the exhaust-gas treatment tower, makes waste gas reach emission standard, is favorable to the environmental protection.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the heat exchange mechanism, the temperature of air introduced into the combustor is increased, the waste of fuel combustion heat caused by heat absorption of air is reduced, the heating efficiency is improved, and energy conservation and environmental protection are facilitated;

2. the first heat exchange tube and the second heat exchange tube are arranged into the coil tubes, so that the contact area of air and the heat exchange tubes is increased, and the heating efficiency is improved;

3. this application has avoided regeneration aggregate and naked light direct contact through setting up a stoving section of thick bamboo into the bilayer to reduce the production of abandonment pitch flue gas, be favorable to the environmental protection.

Drawings

FIG. 1 is a block diagram of an asphalt mixing system with a heat exchange mechanism in an embodiment of the application;

FIG. 2 is a block diagram of a heat exchange mechanism in the embodiment of the present application;

fig. 3 is a schematic partial cross-sectional view of a first heat exchanger in an embodiment of the present application.

Reference numerals: 1. a heating mechanism; 101. a drying drum; 102. a first feed port; 103. a first discharge port; 104. a burner; 105. a second feed port; 106. a second discharge port; 2. a heat exchange mechanism; 201. a first heat exchanger; 2011. a first air inlet; 2012. a first air outlet; 2013. a first heat exchange tube; 2014. a first water inlet; 2015. a first water outlet; 2016. an air duct; 2017. a sealing plug; 202. a second heat exchanger; 2021. a second air inlet; 2022. a second air outlet; 2023. a second heat exchange tube; 2024. a second water inlet; 2025. a second water outlet; 203. a water return pump; 204. a water control assembly; 2041. a water replenishing pipe; 2042. a drain pipe; 2043. a water replenishing tank; 2044. a water replenishing pump; 2045. draining pump; 3. an aggregate prestoring mechanism; 4. a reclaimed material prestoring mechanism; 5. a powder pre-storing mechanism; 6. an asphalt prestoring mechanism; 7. a stirring mechanism; 8. a dust removal mechanism; 9. and an exhaust gas treatment mechanism.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses pitch mix system with heat transfer mechanism 2. Referring to fig. 1, the asphalt mixing system with the heat exchange mechanism 2 comprises a heating mechanism 1, an aggregate prestoring mechanism 3, a reclaimed material prestoring mechanism 4, an asphalt prestoring mechanism 6, a stirring mechanism 7, a dust removing mechanism 8, a heat exchange mechanism 2 and a waste gas treatment mechanism 9.

Referring to fig. 1, the heating mechanism 1 includes a drying cylinder 101, a first feeding hole 102 is disposed at the top of the drying cylinder 101, a first discharging hole 103 and a burner 104 are disposed at the bottom of the drying cylinder 101, the burner 104 is disposed at the center of the bottom of the drying cylinder 101, an output end of the burner 104 is communicated with the drying cylinder 101, and an air inlet of the burner 104 is disposed at the bottom of the burner 104. The aggregate enters the drying cylinder 101 from the first feeding hole 102 and is heated and dried by the burner 104, and air is introduced into an air inlet of the burner 104 to support combustion in the heating process. In order to reduce asphalt smoke generated during heating of the recycled aggregate, the drying cylinder 101 is a double-layer cylinder, the outer cylinder of the drying cylinder 101 is provided with a second feeding hole 105 and a second discharging hole 106, the recycled aggregate is fed from the second feeding hole 105, and the recycled aggregate is discharged from the second discharging hole 106 after being heated.

Referring to fig. 1, an aggregate prestoring mechanism 3 is sequentially communicated with an aggregate hoister, an aggregate screening machine, an aggregate storage bin, an aggregate metering bin and a first storage bin along a conveying direction. The feed end and the first discharge gate 103 intercommunication of aggregate lifting machine, the discharge end of aggregate lifting machine and the feed end intercommunication of aggregate screening machine, the feed end intercommunication in storehouse is stored with the aggregate to the discharge end of aggregate screening machine, and the discharge end in storehouse and the feed end intercommunication in aggregate measurement storehouse are stored to the aggregate, and the discharge end in aggregate measurement storehouse and the first feed end intercommunication of storing the storehouse, the first discharge end and the rabbling mechanism 7 intercommunication of storing the storehouse. The aggregate hoister is a vertical material hoister, the aggregate screening machine is a vibrating screening machine, the aggregate storage bin and the first storage bin are heat-preservation steel plate bins, and the aggregate metering bin is an electronic metering bin.

Referring to fig. 1, the reclaimed material prestoring mechanism 4 is provided with a reclaimed material hoister, a reclaimed material storage bin, a reclaimed material metering bin and a second storage bin in sequence along the conveying direction. The feed end and the second discharge gate 106 intercommunication of reclaimed material lifting machine, the feed end intercommunication in storehouse is stored with the reclaimed material to the discharge end of reclaimed material lifting machine, and the discharge end in storehouse and the feed end intercommunication in reclaimed material measurement storehouse are stored to the reclaimed material, and the discharge end in storehouse and the feed end intercommunication in storehouse are stored to the reclaimed material measurement storehouse, and the discharge end and the rabbling mechanism 7 intercommunication in storehouse are stored to the second. The reclaimed material lifting machine is a vertical material lifting machine, the reclaimed material storage bin and the second storage bin are heat-preservation steel plate bins, and the reclaimed material metering bin is an electronic metering bin.

Referring to fig. 1, the powder pre-storage mechanism 5 is sequentially provided with a powder storage bin, a powder metering bin and a third storage bin along the conveying direction. The feed end and the dust removal mechanism 8 intercommunication in storehouse are stored to the powder, and the discharge end in storehouse and the feed end intercommunication in powder measurement storehouse are stored to the powder, and the discharge end in storehouse and the feed end intercommunication in third storage storehouse are stored to the discharge end in powder measurement storehouse, and the discharge end and the 7 intercommunications of rabbling mechanism in storehouse are stored to the third. The powder storage bin and the third storage bin are both heat-preservation steel plate bins, and the powder metering bin is an electronic metering bin.

Referring to fig. 1, the asphalt pre-storing mechanism 6 sequentially comprises an asphalt storage bin, an asphalt metering bin and a fourth storage bin along the conveying direction. The discharge end in storehouse and the feed end intercommunication in pitch measurement storehouse are stored to pitch, and the discharge end in pitch measurement storehouse and the feed end intercommunication in fourth storage storehouse, the discharge end and the 7 intercommunications of rabbling mechanism in fourth storage storehouse. The asphalt storage bin and the fourth storage bin are both heat-preservation steel plate bins, and the asphalt metering bin is an electronic metering bin.

Referring to fig. 1, the stirring mechanism 7 is provided with a continuous stirring cylinder, a pre-stirring storage bin, a forced stirring cylinder and a finished product storage bin in sequence along the feeding direction. The feed end of continuous mixing bowl stores the discharge end intercommunication in storehouse, the discharge end of third storage storehouse, the discharge end of fourth storage storehouse with the first discharge end of storing the storehouse respectively, and the discharge end of continuous mixing bowl and the feed end intercommunication of storing the storehouse of stiring in advance, the discharge end of storing the storehouse and the feed end intercommunication of forcing the mixing bowl in advance, and the discharge end of forcing the mixing bowl and the feed end intercommunication of finished product storage storehouse. When the finished product materials need to be transported, the finished product materials stored in the finished product storage bin are discharged to the finished product material conveying vehicle for feeding, and dust generated in the discharging process is absorbed by the dust removal mechanism 8. The continuous stirring cylinder is a concrete continuous spiral stirrer, the pre-stirring storage bin and the finished product storage bin are both heat-preservation steel plate bins, and the forced stirring cylinder is a concrete double-shaft forced stirrer.

Referring to fig. 1, the dust removing mechanism 8 includes a bag-type dust remover, after the bag-type dust remover filters dust gas, dust is discharged to a powder storage bin for storage, and high-temperature waste gas enters the heat exchanging mechanism 2.

Referring to fig. 1 and 2, the heat exchange mechanism 2 includes a first heat exchanger 201 and a second heat exchanger 202, and the first heat exchanger 201 is provided with a first air inlet 2011 communicated with the bag-type dust collector and a first air outlet 2012 communicated with the exhaust gas treatment mechanism 9. First heat exchange tube 2013 is arranged in first heat exchanger 201, first heat exchange tube 2013 is set to be a spiral coil, and two ends of first heat exchange tube 2013 are respectively provided with a first water inlet 2014 penetrating through the side wall of first heat exchanger 201 and a first water outlet 2015 penetrating through the side wall of first heat exchanger 201. The second heat exchanger 202 is provided with a second air inlet 2021 and a second air outlet 2022, the second air inlet 2021 is communicated with air through an air pump, and the second air outlet 2022 is communicated with an air inlet of the combustor 104. A second heat exchange tube 2023 is arranged in the second heat exchanger 202, the second heat exchange tube 2023 is a spiral coil, and a second water inlet 2024 penetrating through the side wall of the second heat exchanger 202 and a second water outlet 2025 penetrating through the side wall of the second heat exchanger 202 are respectively arranged at two ends of the second heat exchange tube 2023. The first water outlet 2015 is communicated with the second water inlet 2024, the second water outlet 2025 is communicated with the first water inlet 2014, the water return pump 203 is further communicated and arranged between the first water outlet 2015 and the second water inlet 2024, and the water control assembly 204 is further communicated and arranged between the second water outlet 2025 and the first water inlet 2014. The water control assembly 204 comprises a water replenishing pipe 2041, a water discharging pipe 2042 and a water replenishing tank 2043, wherein the water replenishing pipe 2041 and the water discharging pipe 2042 are communicated with each other at intervals on a communication channel between the second water outlet 2025 and the first water inlet 2014. The water replenishing pipe 2041 is communicated with a water replenishing pump 2044, and the water replenishing pipe 2041 is communicated with a water replenishing tank 2043 through the water replenishing pump 2044. The drain pipe 2042 is provided with a drain pump 2045 in communication therewith, and the drain pipe 2042 is in communication with the water replenishment tank 2043 via the drain pump 2045.

Referring to fig. 2 and 3, an air duct 2016 is further disposed in the first heat exchanger 201, two ends of the air duct 2016 are respectively communicated with the first air inlet 2011 and the second air inlet 2021, the air duct 2016 is a spiral coil, and the first heat exchange tube 2013 is disposed in the air duct 2016. Both ends of the first heat exchange tube 2013 penetrate the end of the air duct 2016 and are plugged by a sealing plug 2017. Through setting up air duct 2016, prolonged the hot-air circulation route, can improve the heating efficiency to the water in first heat exchange tube 2013.

Referring to fig. 1, the exhaust gas treatment mechanism 9 includes an exhaust gas treatment tower, an air inlet end of the exhaust gas treatment tower is communicated with the first air outlet 2012, and the treated clean air is discharged from an air outlet end of the exhaust gas treatment tower.

The working principle and the beneficial effects of the asphalt mixing system with the heat exchange mechanism 2 in the embodiment of the application are as follows: the natural aggregate enters the stirring mechanism 7 after passing through the heating mechanism 1 and the aggregate prestoring mechanism 3 in sequence, the recycled aggregate enters the stirring mechanism 7 after passing through the heating mechanism 1 and the recycled material prestoring mechanism 4 in sequence, the powder enters the stirring mechanism 7 after passing through the powder prestoring mechanism 5, the asphalt enters the stirring mechanism 7 after passing through the asphalt prestoring mechanism 6, the aggregate, the recycled material, the dust and the asphalt are discharged after being continuously stirred and forcibly stirred in sequence, when the finished material is loaded, the dust and hot air are absorbed by the dedusting mechanism 8, after being filtered, the hot air enters the first heat exchanger 201, the water in the first heat exchange tube 2013 is heated, the hot water in the first heat exchange tube 2013 enters the second heat exchanger 2023, so that the air in the second heat exchanger 202 is heated, the heated air enters the combustor 104 for supporting combustion, and the heat loss caused by the lower temperature of the combustion-supporting air is reduced, is beneficial to energy conservation and environmental protection.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An asphalt mixing system with a heat exchange mechanism (2) is characterized by comprising a heating mechanism (1), an aggregate prestoring mechanism (3), a reclaimed material prestoring mechanism (4), a powder prestoring mechanism (5), an asphalt prestoring mechanism (6), a stirring mechanism (7), a dust removal mechanism (8), the heat exchange mechanism (2) and a waste gas treatment mechanism (9);

the heating mechanism (1) comprises a drying cylinder (101), a first feeding hole (102) is formed in the top of the drying cylinder (101), a first discharging hole (103) and a combustor (104) are formed in the bottom of the drying cylinder (101), an air inlet of the combustor (104) is formed in the bottom of the combustor (104), and the output end of the combustor (104) is communicated with the drying cylinder (101);

the heat exchange mechanism (2) comprises a first heat exchanger (201) and a second heat exchanger (202), the first heat exchanger (201) is provided with a first air inlet (2011) and a first air outlet (2012), the first air inlet (2011) is communicated with a dust removal mechanism (8), the first air outlet (2012) is communicated with a waste gas treatment mechanism (9), a first heat exchange tube (2013) is arranged in the first heat exchanger (201), a first water inlet (2014) and a first water outlet (2015) are respectively arranged at two ends of the first heat exchange tube (2013), the first water inlet (2014) and the first water outlet (2015) both penetrate through the side wall of the first heat exchanger (201), the second heat exchanger (202) is provided with a second air inlet (2021) and a second air outlet (2022), the second air inlet (2021) is communicated with air, and the second air outlet (2022) is communicated with an air inlet of the combustor (104), a second heat exchange tube (2023) is arranged in the second heat exchanger (202), a second water inlet (2024) and a second water outlet (2025) are respectively arranged at two ends of the second heat exchange tube (2023), the second water inlet (2024) and the second water outlet (2025) are arranged by penetrating through the side wall of the second heat exchanger (202), the first water outlet (2015) is communicated with the second water inlet (2024), the second water outlet (2025) is communicated with the first water inlet (2014), a water return pump (203) is communicated between the first water outlet (2015) and the second water inlet (2024), and a water control assembly (204) is communicated between the second water outlet (2025) and the first water inlet (2014).

2. Asphalt mixing system with heat exchange mechanism (2) according to claim 1, characterized in that the first heat exchange pipe (2013) and the second heat exchange pipe (2023) are both arranged as coils.

3. The asphalt mixing system with the heat exchange mechanism (2) is characterized in that the water control assembly (204) comprises a water replenishing pipe (2041), a water discharging pipe (2042) and a water replenishing tank (2043), the water replenishing pipe (2041) and the water discharging pipe (2042) are communicated with a communication channel between the second water outlet (2025) and the first water inlet (2014), a water replenishing pump (2044) is communicated with the water replenishing pipe (2041), the water replenishing pipe (2041) is communicated with the water replenishing tank (2043) through the water replenishing pump (2044), a water discharging pump (2045) is communicated with the water discharging pipe (2042), and the water discharging pipe (2042) is communicated with the water replenishing tank (2043) through the water discharging pump (2045).

4. Asphalt mixing system with heat exchange mechanism (2) according to claim 1, characterized in that said drying cylinder (101) is provided with a double-layer cylinder, and the outer cylinder of said drying cylinder (101) is provided with a second feeding hole (105) and a second discharging hole (106) in communication.

5. The asphalt mixing system with the heat exchange mechanism (2) as claimed in claim 1, wherein the aggregate pre-storing mechanism (3) is provided with an aggregate elevator, an aggregate screening machine, an aggregate storage bin, an aggregate metering bin and a first storage bin in sequence along the conveying direction, the aggregate elevator is communicated with the first discharge port (103), and the first storage bin is communicated with the stirring mechanism (7).

6. The asphalt mixing system with the heat exchange mechanism (2) as claimed in claim 4, wherein the reclaimed material pre-storing mechanism (4) is provided with a reclaimed material elevator, a reclaimed material storage bin, a reclaimed material metering bin and a second storage bin in sequence along the conveying direction, the reclaimed material elevator is communicated with the second discharging port (106), and the second storage bin is communicated with the stirring mechanism (7).

7. Asphalt mixing system with heat exchange mechanism (2) according to claim 1, characterized in that said asphalt pre-storing mechanism (6) comprises an asphalt storage bin, an asphalt metering bin and a fourth storage bin in turn along the feeding direction, said fourth storage bin is communicated with the stirring mechanism (7).

8. Asphalt mixing system with heat exchange mechanism (2) according to claim 1, characterized in that said powder pre-storing mechanism (5) is provided with a powder storage bin, a powder metering bin and a third storage bin in sequence along the feeding direction, said powder storage bin is communicated with said dust removing mechanism (8), and said third storage bin is communicated with said stirring mechanism (7).

9. The asphalt mixing system with the heat exchange mechanism (2) as claimed in claim 8, wherein the stirring mechanism (7) is sequentially provided with a continuous stirring cylinder, a pre-stirring storage bin, a forced stirring cylinder and a finished product storage bin along the conveying direction, the continuous stirring cylinder is communicated with the first storage bin, the second storage bin, the third storage bin and the fourth storage bin, the finished product material in the finished product storage bin is discharged to the finished product material conveying vehicle for feeding, dust generated in the discharging process is absorbed by the dust removal mechanism (8), the dust removal mechanism (8) comprises a bag-type dust remover, the bag-type dust remover filters dust, the dust is discharged to the powder storage bin, and waste gas enters the first heat exchanger (201) from the first air inlet (2011).

10. Asphalt mixing system with heat exchange mechanism (2) according to claim 1, characterized in that the waste gas treatment mechanism (9) comprises a waste gas treatment tower, the inlet end of the waste gas treatment tower is communicated with the first outlet (2012), and the treated clean gas is discharged from the outlet end of the waste gas treatment tower.