An asphalt mixing plant tail gas treatment system with waste heat recovery function

Abstract

The utility model relates to an asphalt mixing plant tail gas treatment system with waste heat recovery function, including a regeneration drying cylinder and a burner for heating the regeneration drying cylinder, the smoke exhaust port of the regeneration drying cylinder is connected to the air inlet of the secondary cyclone dust collector through the first pipe group, the exhaust port of the secondary cyclone dust collector is connected to the air inlet of the bag dust collector through the second pipe group, the exhaust port of the bag dust collector is connected to the shell side inlet of the heat exchanger through the third pipe group, the shell side outlet of the heat exchanger is connected to the exhaust pipe through the fourth pipe group, and the fourth pipe group is equipped with a main induced draft fan; the tube side inlet of the heat exchanger is connected to the circulation outlet of the heat-using equipment through the fifth pipe group, and the tube side outlet of the heat exchanger is connected to the circulation inlet of the heat-using equipment through the sixth pipe group. By setting the heat exchanger, the heat carried by the high-temperature tail gas can be recycled and utilized, avoiding resource waste and improving the energy utilization rate of the system.

Description

Technical Field

[0001] The utility model relates to the technical field of asphalt mixing stations, in particular to an asphalt mixing station tail gas treatment system with a waste heat recovery function. Background Art

[0002] Asphalt mixing plant is a complete set of equipment used for mass production of asphalt concrete. It can produce asphalt mixture, modified asphalt mixture, and colored asphalt mixture. It is necessary equipment for the construction of expressways, grade roads, municipal roads, airports, and ports. The high-temperature exhaust gas containing smoke and dust generated during the operation of the asphalt mixing plant needs to be treated to meet the emission standards before it can be discharged into the atmosphere.

[0003] In the prior art, bag filters are usually used to filter out the smoke and dust in the exhaust gas before discharging it. This exhaust gas treatment system has a high efficiency in treating exhaust gas. However, since the exhaust gas generated during the operation of the asphalt mixing plant is high-temperature exhaust gas, the exhaust gas treatment system based on bag filters cannot utilize the heat carried by the high-temperature exhaust gas, resulting in a waste of resources and reducing the energy utilization rate of the system. Utility Model Content

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides an asphalt mixing plant exhaust gas treatment system with waste heat recovery function. By setting a heat exchanger, the heat carried by the high-temperature exhaust gas can be recovered and utilized, avoiding resource waste and improving the energy utilization rate of the system.

[0005] The technical solution adopted by the utility model is as follows:

[0006] An asphalt mixing plant tail gas treatment system with waste heat recovery function, comprising a regeneration drying cylinder and a burner for heating the regeneration drying cylinder, wherein the smoke exhaust port of the regeneration drying cylinder is connected to the air inlet of a secondary cyclone dust collector through a first pipe group, the exhaust port of the secondary cyclone dust collector is connected to the air inlet of a bag dust collector through a second pipe group, the exhaust port of the bag dust collector is connected to the shell side inlet of a heat exchanger through a third pipe group, the shell side outlet of the heat exchanger is connected to the exhaust cylinder through a fourth pipe group, and a main induced draft fan is mounted on the fourth pipe group;

[0007] The tube side inlet of the heat exchanger is connected to the circulation outlet of the heat-using equipment through the fifth tube group, and the tube side outlet of the heat exchanger is connected to the circulation inlet of the heat-using equipment through the sixth tube group;

[0008] The high-temperature exhaust gas in the regeneration drying cylinder is dedusted by the secondary cyclone dust collector and the bag dust collector, and then heat is exchanged in the heat exchanger, so that the temperature of the high-temperature exhaust gas is reduced to obtain low-temperature exhaust gas. The main induced draft fan generates negative pressure, so that the low-temperature exhaust gas is discharged through the exhaust pipe.

[0009] As a further improvement of the above technical solution:

[0010] The heat transfer medium in the heat exchanger is heat transfer oil.

[0011] The temperature of the high-temperature tail gas ranges from 90°C to 130°C.

[0012] The temperature range of the low-temperature tail gas is 0°C-20°C.

[0013] The secondary cyclone dust collector includes a first cyclone dust collector and a second cyclone dust collector connected in series with the first cyclone dust collector.

[0014] The first pipe group includes a first main pipe and a first branch pipe;

[0015] One end of the first main pipe is connected to the smoke exhaust port of the regeneration drying drum, and the other end of the first main pipe is connected to the air inlet of the first cyclone dust collector;

[0016] One end of the first branch pipe is connected to the first main pipe, and the other end of the first branch pipe is connected to the air inlet of the second cyclone dust collector.

[0017] The second pipe group includes a second main pipe and a second branch pipe;

[0018] One end of the second main pipe is connected to the exhaust port of the first cyclone dust collector, and the other end of the second main pipe is connected to the air inlet of the bag dust collector;

[0019] One end of the second branch pipe is connected to the second main pipe, and the other end of the second branch pipe is connected to the exhaust port of the second cyclone dust collector.

[0020] The first cyclone dust collector and the second cyclone dust collector both adopt a tangential feeding method.

[0021] The fifth pipe group is equipped with a circulation pump.

[0022] The sixth pipe group is equipped with a control valve.

[0023] The beneficial effects of the utility model are as follows:

[0024] The utility model has a compact and reasonable structure and is easy to operate. By arranging a heat exchanger and its connecting pipe group, the heat carried by the high-temperature exhaust gas can be transferred to the heat-using equipment, thereby recycling the heat carried by the high-temperature exhaust gas, improving energy utilization and avoiding waste of resources.

[0025] The utility model also has the following advantages:

[0026] (1) In the present invention, by setting the temperature of the high-temperature exhaust gas to 90°C-130°C, condensation of the high-temperature exhaust gas in the bag filter can be avoided, thereby extending the service life of the bag filter.

[0027] (2) In the present invention, heat transfer oil is used as the heat transfer medium, which has high heat transfer efficiency, uniform heat transfer, and is easy to transport, thereby ensuring the heat exchange effect.

[0028] (3) The heat-using equipment in the present invention covers equipment using thermal oil as the heat transfer medium, including thermal oil water heaters, thermal oil air conditioners, thermal oil floor heating, and thermal oil greenhouses, which have a wide range of uses and high heat transfer efficiency.

[0029] (4) The utility model can further improve its dust removal effect by providing a secondary cyclone dust collector and adopting a tangential feeding method. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the utility model.

[0031] Figure 2 It is a schematic diagram of the connection structure between the secondary cyclone dust collector, the regeneration drying cylinder and the bag dust collector.

[0032] Figure 3 This is a schematic diagram of heat exchange in the utility model.

[0033] Among them: 1. Burner; 2. Regeneration drying cylinder; 3. Secondary cyclone dust collector; 301. First cyclone dust collector; 302. Second cyclone dust collector; 4. Bag dust collector; 5. Heat exchanger; 6. Main induced draft fan; 7. Heat-using equipment; 8. Exhaust pipe; 9. Circulation pump; 10. Control valve; 11. First pipe group; 1101. First main pipe; 1102. First branch pipe; 12. Second pipe group; 1201. Second main pipe; 1202. Second branch pipe; 13. Third pipe group; 14. Fourth pipe group; 15. Fifth pipe group; 16. Sixth pipe group. DETAILED DESCRIPTION

[0034] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0035] The structure and functions of the utility model are as follows:

[0036] like Figure 1-Figure 3As shown, an asphalt mixing plant tail gas treatment system with waste heat recovery function includes a regeneration drying cylinder 2 and a burner 1 for heating the regeneration drying cylinder 2. The smoke exhaust port of the regeneration drying cylinder 2 is connected to the air inlet of the secondary cyclone dust collector 3 through a first pipe group 11, the exhaust port of the secondary cyclone dust collector 3 is connected to the air inlet of the bag dust collector 4 through a second pipe group 12, the exhaust port of the bag dust collector 4 is connected to the shell side inlet of the heat exchanger 5 through a third pipe group 13, and the shell side outlet of the heat exchanger 5 is connected to the exhaust cylinder through a fourth pipe group 14. 8 is connected, and the fourth pipe group 14 is equipped with a main induced draft fan 6; the pipe side inlet of the heat exchanger 5 is connected to the circulation outlet of the heat-using device 7 through the fifth pipe group 15, and the pipe side outlet sixth pipe group 16 of the heat exchanger 5 is connected to the circulation inlet of the heat-using device 7; the high-temperature exhaust gas in the regeneration drying cylinder 2 is dedusted by the secondary cyclone dust collector 3 and the bag dust collector 4, and then heat is exchanged in the heat exchanger 5, so that the temperature of the high-temperature exhaust gas is reduced to obtain low-temperature exhaust gas, and the main induced draft fan 6 generates negative pressure, so that the low-temperature exhaust gas is discharged through the exhaust pipe 8.

[0037] The utility model discloses an asphalt mixing plant tail gas treatment system with waste heat recovery function, which is used to treat the high-temperature tail gas generated when the regeneration drying drum 2 heats aggregate, so that the high-temperature tail gas meets the emission standards; at the same time, by setting a heat exchanger 5, the heat carried in the high-temperature tail gas can be recovered and utilized, thereby improving energy utilization and avoiding resource waste.

[0038] The heat transfer medium in the heat exchanger 5 is heat transfer oil. Heat transfer oil has the advantages of high heat transfer efficiency, uniform heat transfer, and easy transportation, and has a good heat exchange effect; Figure 3 As shown, the temperature range of the heat transfer oil flowing into the heat exchanger 5 is 0°C-20°C, and the temperature range of the heat transfer oil flowing out of the heat exchanger 5 is 0°C-130°C.

[0039] The temperature range of the high-temperature exhaust gas is 90° C.-130° C., which can prevent the high-temperature exhaust gas from condensing in the bag-type dust collector 4 and extend the service life of the bag-type dust collector 4.

[0040] The temperature range of low-temperature exhaust gas is 0℃-20℃. At this time, most of the heat carried by the high-temperature exhaust gas is exchanged in the heat transfer oil, thus avoiding energy waste.

[0041] The secondary cyclone dust collector 3 includes a first cyclone dust collector 301 and a second cyclone dust collector 302 connected in series with the first cyclone dust collector 301; Figure 2 As shown, the connection structure between the secondary cyclone dust collector 3 and the smoke exhaust port of the regeneration drying cylinder 2 through the first pipe group 11 is as follows:

[0042] The first pipe group 11 includes a first main pipe 1101 and a first branch pipe 1102; one end of the first main pipe 1101 is connected to the smoke exhaust port of the regeneration drying drum 2, and at the same time, the other end of the first main pipe 1101 is connected to the air inlet of the first cyclone dust collector 301; one end of the first branch pipe 1102 is connected to the first main pipe 1101, and at the same time, the other end of the first branch pipe 1102 is connected to the air inlet of the second cyclone dust collector 302.

[0043] like Figure 2 As shown, the connection structure between the secondary cyclone dust collector 3 and the air inlet of the bag dust collector 4 through the second pipe group 12 is as follows:

[0044] The second pipe group 12 includes a second main pipe 1201 and a second branch pipe 1202; one end of the second main pipe 1201 is connected to the exhaust port of the first cyclone dust collector 301, and at the same time, the other end of the second main pipe 1201 is connected to the air inlet of the bag dust collector 4; one end of the second branch pipe 1202 is connected to the second main pipe 1201, and at the same time, the other end of the second branch pipe 1202 is connected to the exhaust port of the second cyclone dust collector 302.

[0045] The first cyclone dust collector 301 and the second cyclone dust collector 302 both adopt a tangential feeding method. The air inlet of the first cyclone dust collector 301 is arranged on the outer circumferential surface of the shell of the first cyclone dust collector 301, and the axial direction of the air inlet is perpendicular to the axial direction of the shell;

[0046] The arrangement of the air inlet of the second cyclone dust collector 302 is the same as that of the air inlet of the first cyclone dust collector 301; the use of tangential feeding can improve the dust removal efficiency of the cyclone dust collector.

[0047] A circulation pump 9 is mounted on the fifth tube group 15. The circulation pump 9 is used to drive the heat transfer oil to circulate in the heat exchanger 5, the sixth tube group 16, the heat-using device 7, and the fifth tube group 15.

[0048] The sixth tube group 16 is equipped with a control valve 10 , and the control valve 10 is used to control the on-off of the sixth tube group 16 .

[0049] The working process of the utility model is as follows:

[0050] Burner 1 is started, and aggregate is heated through regeneration drying drum 2, and dusty high-temperature exhaust gas is generated during the heating process;

[0051] The high-temperature exhaust gas of 90°C-130°C enters the secondary cyclone dust collector 3 through the first tube group 11 to remove the coarse particles therein, and then enters the bag dust collector 14 through the second tube group 12 to remove the particles therein, thereby completing the dust removal;

[0052] The high-temperature exhaust gas after dust removal enters the heat exchanger 5 through the third pipe group 13, and exchanges heat with the heat transfer oil, so that the temperature of the heat transfer oil in the pipe side of the heat exchanger 5 increases. Under the action of the circulating pump 9, the heat transfer oil circulates between the heat exchanger 5 and the heat-using device 7, thereby transferring heat to the heat-using device 7.

[0053] After heat exchange, the temperature of the high-temperature tail gas is reduced to obtain a low-temperature tail gas with a temperature of 0°C-20°C;

[0054] Finally, under the action of the main induced draft fan 6, the low-temperature exhaust gas is discharged into the atmosphere through the fourth pipe group 14 and the exhaust pipe 8.

[0055] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the protection scope of the utility model.

Claims

1. An asphalt mixing plant tail gas treatment system with waste heat recovery function, comprising a regeneration drying drum (2) and a burner (1) for heating the regeneration drying drum (2), characterized in that: The smoke exhaust port of the regeneration drying cylinder (2) is connected to the air inlet of the secondary cyclone dust collector (3) through the first pipe group (11), the exhaust port of the secondary cyclone dust collector (3) is connected to the air inlet of the bag dust collector (4) through the second pipe group (12), the exhaust port of the bag dust collector (4) is connected to the shell side inlet of the heat exchanger (5) through the third pipe group (13), the shell side outlet of the heat exchanger (5) is connected to the exhaust pipe (8) through the fourth pipe group (14), and the fourth pipe group (14) is equipped with a main induced draft fan (6); The tube side inlet of the heat exchanger (5) is connected to the circulation outlet of the heat-using device (7) through the fifth tube group (15), and the tube side outlet of the heat exchanger (5) is connected to the circulation inlet of the heat-using device (7) through the sixth tube group (16); The high-temperature exhaust gas in the regeneration drying cylinder (2) is dedusted by the secondary cyclone dust collector (3) and the bag dust collector (4), and then heat is exchanged in the heat exchanger (5), thereby reducing the temperature of the high-temperature exhaust gas to obtain low-temperature exhaust gas. The main induced draft fan (6) generates negative pressure, thereby discharging the low-temperature exhaust gas through the exhaust pipe (8).

2. The asphalt mixing plant tail gas treatment system with waste heat recovery function as claimed in claim 1, characterized in that: The heat transfer medium in the heat exchanger (5) is heat transfer oil.

3. The asphalt mixing plant tail gas treatment system with waste heat recovery function as claimed in claim 1, characterized in that: The temperature of the high-temperature tail gas ranges from 90°C to 130°C.

4. The asphalt mixing plant tail gas treatment system with waste heat recovery function as claimed in claim 1, characterized in that: The temperature range of the low-temperature tail gas is 0°C-20°C.

5. The asphalt mixing plant tail gas treatment system with waste heat recovery function as claimed in claim 1, characterized in that: The secondary cyclone dust collector (3) comprises a first cyclone dust collector (301) and a second cyclone dust collector (302) connected in series with the first cyclone dust collector (301).

6. The asphalt mixing plant tail gas treatment system with waste heat recovery function as claimed in claim 5, characterized in that: The first pipe group (11) comprises a first main pipe (1101) and a first branch pipe (1102); One end of the first main pipe (1101) is connected to the smoke exhaust port of the regeneration drying drum (2), and the other end of the first main pipe (1101) is connected to the air inlet of the first cyclone dust collector (301); One end of the first branch pipe (1102) is connected to the first main pipe (1101), and the other end of the first branch pipe (1102) is connected to the air inlet of the second cyclone dust collector (302).

7. The asphalt mixing plant tail gas treatment system with waste heat recovery function as claimed in claim 5, characterized in that: The second pipe group (12) comprises a second main pipe (1201) and a second branch pipe (1202); One end of the second main pipe (1201) is connected to the exhaust port of the first cyclone dust collector (301), and the other end of the second main pipe (1201) is connected to the air inlet of the bag dust collector (4); One end of the second branch pipe (1202) is connected to the second main pipe (1201), and the other end of the second branch pipe (1202) is connected to the exhaust port of the second cyclone dust collector (302).

8. The asphalt mixing plant tail gas treatment system with waste heat recovery function as claimed in claim 5, characterized in that: The first cyclone dust collector (301) and the second cyclone dust collector (302) both adopt a tangential feeding method.

9. The asphalt mixing plant tail gas treatment system with waste heat recovery function as claimed in claim 1, characterized in that: The fifth pipe group (15) is cooperatively mounted with a circulation pump (9).

10. The asphalt mixing plant tail gas treatment system with waste heat recovery function as claimed in claim 1, characterized in that: The sixth pipe group (16) is cooperatively mounted with a control valve (10).

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