Flue gas dehumidification and white smoke elimination system of asphalt stirring equipment

Abstract

The utility model relates to a smoke dehumidification and white elimination system for asphalt mixing equipment, which comprises a chimney and a main induced draft fan, an inlet of the main induced draft fan is communicated with a smoke outlet of the mixing equipment, a smoke inlet is arranged on the chimney, and an outlet of the main induced draft fan is communicated with the smoke inlet; a first automatic air door is arranged on the chimney above the flue gas inlet, a first connector is arranged on the chimney above the first automatic air door, and a second connector is arranged on the chimney below the first automatic air door; the flue gas dehumidification system further comprises flue gas dehumidification equipment and a relay fan, an inlet of the flue gas dehumidification equipment is connected with an inlet flue, the tail end of the inlet flue is communicated with the second connector, an outlet of the flue gas dehumidification equipment is connected with an inlet of the relay fan, an outlet of the relay fan is connected with an outlet flue, and the tail end of the outlet flue is communicated with the first connector. Therefore, the phenomenon of white smoke emission at the outlet of the chimney is eliminated, visual pollution is avoided, the corrosion and rusting speed of the chimney is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of asphalt mixing equipment, in particular to a smoke dehumidification and dewhitening system for asphalt mixing equipment. Background Art

[0002] The main source of moisture in the flue gas of asphalt mixing equipment is the moisture contained in the aggregate, which enters the flue gas in the form of water vapor after high-temperature drying in the drying drum. The moisture content of traditional aggregates is generally around 2-3%. In recent years, with the moisture content of aggregates produced by new production processes such as "water-washed materials" reaching 6-10% or more, the water vapor entering the flue gas has increased dramatically, and the moisture content of the flue gas can reach more than 20%.

[0003] As the flue gas enters the chimney and is discharged into the atmosphere, its temperature gradually decreases, and its ability to carry water vapor decreases. A large amount of water vapor condenses into small droplets, resulting in "white smoke" at the chimney outlet, causing visual pollution, which is especially obvious in winter when the temperature is lower. Moreover, wet flue gas with a large amount of water vapor will accelerate the corrosion and rust of the chimney, reducing the service life of the equipment.

[0004] At the same time, due to the temperature requirements for the production of asphalt concrete, the flue gas temperature of asphalt mixing equipment is generally around 100-150°C. The high-temperature flue gas is directly discharged, taking away a large amount of heat and causing energy waste. Utility Model Content

[0005] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a flue gas dehumidification and whitening system for asphalt mixing equipment, thereby eliminating the phenomenon of "white smoke" at the chimney outlet, avoiding visual pollution, reducing the corrosion and rusting rate of the chimney, and extending the service life of the equipment.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A smoke dehumidification and desmog system for an asphalt mixing plant, comprising a chimney and a main induced draft fan, wherein the inlet of the main induced draft fan is connected to the smoke outlet of the mixing plant, the chimney is provided with a smoke inlet, and the outlet of the main induced draft fan is connected to the smoke inlet;

[0008] A first automatic damper is provided on the chimney above the smoke inlet, a first interface is provided on the chimney above the first automatic damper, and a second interface is provided on the chimney below the first automatic damper;

[0009] It also includes a flue gas dehumidification device and a relay fan, wherein the inlet of the flue gas dehumidification device is connected to an inlet flue, the end of the inlet flue is connected to a second interface, the outlet of the flue gas dehumidification device is connected to the inlet of the relay fan, the outlet of the relay fan is connected to an outlet flue, and the end of the outlet flue is connected to the first interface.

[0010] As a further improvement of the above technical solution:

[0011] The flue gas dehumidification equipment comprises a shell, a heat exchanger is arranged on the shell, a water inlet and a water outlet are arranged on the heat exchanger, cooling water flows inside the heat exchanger for cooling water vapor in the flue gas, a cooling water inlet pipe and a cooling water outlet pipe are arranged outside the shell, the cooling water inlet pipe is connected to the water inlet, and the cooling water outlet pipe is connected to the water outlet;

[0012] A condensed water collecting device is arranged at the lower part of the shell.

[0013] The structure of the heat exchanger is as follows: it comprises a first end cap and a second end cap which are arranged opposite to each other, the first end cap and the second end cap are both rectangular shell structures, a plurality of fin tubes are arranged side by side between the first end cap and the second end cap, and each fin tube connects the first end cap and the second end cap;

[0014] The water inlet and the water outlet are respectively arranged at the two ends of the first head, and a plurality of partitions are arranged inside the first head and the second head. The partitions are used to change the flow direction of the cooling water so that the cooling water enters from the water inlet and flows through a plurality of fin tubes in sequence before flowing out from the water outlet.

[0015] There are a plurality of heat exchangers, which are stacked on the shell from top to bottom.

[0016] It also includes a connecting plate, which is used to connect the first head and the second head to form a rectangular frame. Rectangular connecting flanges are arranged on both sides of the rectangular frame. The rectangular connecting flanges of two adjacent heat exchangers are sealed and connected.

[0017] It also includes a cold water tank for storing cooling water and a circulating water pump, wherein the circulating water pump is used to pump the cooling water into a cooling water inlet pipe, wherein the cooling water inlet pipe is connected to a heat-using device, and the heat-using device is used to recover heat in the cooling water;

[0018] It also includes a cooling water pool for further cooling the cooling water. The heat-using equipment is connected to the cooling water pool, and the cooling water pool is connected to the cold water pool for supplying cooling water to the cold water pool.

[0019] The inlet of the flue gas dehumidification equipment is provided with a second automatic damper, and the second automatic damper is connected to the inlet flue.

[0020] It also includes an emergency pressure relief flue, which connects the inlet flue and the outlet flue, and is provided with a third automatic damper.

[0021] The beneficial effects of the utility model are as follows:

[0022] The utility model has a compact and reasonable structure and is easy to operate. A first automatic damper is arranged on the chimney, and a first interface and a second interface are respectively arranged above and below the first automatic damper. The flue gas is led out to the flue gas dehumidification equipment through the inlet flue by a relay fan to remove water vapor, and then re-enters the chimney through the outlet flue, thereby eliminating the phenomenon of "white smoke" at the chimney outlet, avoiding visual pollution, reducing the corrosion and rusting speed of the chimney, and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model.

[0024] Figure 2 This is the front view of the flue gas dehumidification equipment of the present utility model.

[0025] Figure 3 It is the front view of the heat exchanger of the utility model.

[0026] Figure 4 It is a top view of the heat exchanger of the utility model.

[0027] Figure 5 It is a side view of the heat exchanger of the utility model.

[0028] Figure 6 This is a schematic diagram of the flow of flue gas and cooling water in the utility model.

[0029] Among them: 1. First automatic damper; 2. Chimney; 20. Smoke inlet; 3. Main induced draft fan; 4. Inlet flue; 40. Second interface;

[0030] 5. Flue gas dehumidification equipment; 50. Second automatic damper; 51. Cooling water inlet pipe; 52. Shell; 53. Heat exchanger; 5301. Water inlet; 5302. Water outlet; 5303. First end cap; 5304. Second end cap; 5305. Finned tube; 5306. Connecting plate; 5307. Rectangular connecting flange; 54. Condensate collecting device;

[0031] 6. Relay fan; 7. Exit flue; 70. First interface; 8. Emergency pressure relief flue; 80. Third automatic damper. DETAILED DESCRIPTION

[0032] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0033] like Figure 1 As shown, the smoke dehumidification and desmog system of the asphalt mixing equipment of this embodiment includes a chimney 2 and a main induced draft fan 3, the inlet of the main induced draft fan 3 is connected to the smoke outlet of the mixing equipment, and a smoke inlet 20 is provided on the chimney 2, and the outlet of the main induced draft fan 3 is connected to the smoke inlet 20;

[0034] A first automatic damper 1 is provided on the chimney 2 above the smoke inlet 20, a first interface 70 is provided on the chimney 2 above the first automatic damper 1, and a second interface 40 is provided on the chimney 2 below the first automatic damper 1;

[0035] It also includes a flue gas dehumidification device 5 and a relay fan 6. The inlet of the flue gas dehumidification device 5 is connected to the inlet flue 4, and the end of the inlet flue 4 is connected to the second interface 40. The outlet of the flue gas dehumidification device 5 is connected to the inlet of the relay fan 6, and the outlet of the relay fan 6 is connected to the outlet flue 7, and the end of the outlet flue 7 is connected to the first interface 70.

[0036] The device has a simple structure and is easy to arrange. It has almost no impact on the original asphalt mixing plant equipment layout and can be installed on newly built asphalt mixing plants as well as those already in use.

[0037] By arranging the first automatic damper 1 on the chimney 2, arranging the first interface 70 and the second interface 40 above and below the first automatic damper 1 respectively, the relay fan 6 leads the smoke to the smoke dehumidification device 5 through the inlet flue 4 and removes the water vapor, and then re-enters the chimney 2 through the outlet flue 7, thereby eliminating the phenomenon of "white smoke" at the outlet of the chimney 2, avoiding visual pollution, reducing the corrosion and rusting speed of the chimney 2, and extending the service life of the equipment. The relay fan 6 is a draft fan.

[0038] like Figure 2 As shown, the flue gas dehumidification device 5 includes a shell 52, a heat exchanger 53 is arranged on the shell 52, a water inlet 5301 and a water outlet 5302 are arranged on the heat exchanger 53, cooling water flows inside the heat exchanger 53 to cool the water vapor in the flue gas, and a cooling water inlet pipe 51 and a cooling water outlet pipe are arranged outside the shell 52, the cooling water inlet pipe 51 is connected to the water inlet 5301, and the cooling water outlet pipe is connected to the water outlet 5302;

[0039] A condensed water collecting device 54 is disposed at the lower portion of the housing 52 .

[0040] like Figure 3-Figure 5 As shown, the structure of the heat exchanger 53 includes a first end cap 5303 and a second end cap 5304 which are arranged opposite to each other. The first end cap 5303 and the second end cap 5304 are both rectangular shell structures. A plurality of fin tubes 5305 are arranged side by side between the first end cap 5303 and the second end cap 5304. Each fin tube 5305 connects the first end cap 5303 and the second end cap 5304.

[0041] A water inlet 5301 and a water outlet 5302 are respectively arranged at both ends of the first head 5303. A plurality of partitions are arranged inside the first head 5303 and the second head 5304. The partitions are used to change the flow direction of cooling water so that the cooling water enters from the water inlet 5301, flows through a plurality of fin tubes 5305 in sequence, and then flows out from the water outlet 5302.

[0042] like Figure 1-Figure 2 As shown, there are multiple heat exchangers 53 , which are stacked on the shell 52 from top to bottom.

[0043] Specifically, the heat exchanger 53 may be disposed inside the housing 52. In order to further optimize the installation structure of the heat exchanger 53 on the condensed water collecting device 54, the following improvements are made:

[0044] like Figure 3-Figure 5 As shown, it also includes a connecting plate 5306, which is used to connect the first head 5303 and the second head 5304 to form a rectangular frame. Rectangular connecting flanges 5307 are set on both sides of the rectangular frame. The rectangular connecting flanges 5307 of two adjacent heat exchangers 53 are sealed and connected.

[0045] In the structure of the above heat exchanger 53, the water inlet 5301 and the water outlet 5302 are arranged on the same side to facilitate the connection of the cooling water inlet pipe 51 and the cooling water outlet pipe; the connecting plate 5306 connects the first head 5303 and the second head 5304 to form a rectangular frame, so that when multiple heat exchangers 53 are stacked up and down, the rectangular frame forms the middle outer shell of the flue gas dehumidification equipment 5, which is convenient for replacing and adding or reducing the heat exchanger 53, and the condensate collection device 54 is sealed and connected to the bottom heat exchanger 53.

[0046] like Figure 6 As shown, it also includes a cold water tank and a circulating water pump for storing cooling water, the circulating water pump is used to pump cooling water into the cooling water inlet pipe 51, the cooling water inlet pipe 51 is connected to a heat device, and the heat device is used to recover heat in the cooling water; it also includes a cooling water tank for further cooling the cooling water, the heat device is connected to the cooling water tank, and the cooling water tank is connected to the cold water tank, for supplying cooling water to the cold water tank.

[0047] By forming a circulation system for continuous heat exchange between the cooling water flow path and the heat-using equipment, it can be used as a heat source for domestic water, winter room heating, etc., recovering waste heat and avoiding energy waste.

[0048] like Figure 1 As shown, a second automatic damper 50 is provided at the inlet of the flue gas dehumidification equipment 5 , and the second automatic damper 50 is connected to the inlet flue 4 .

[0049] like Figure 1As shown, it also includes an emergency pressure relief flue 8, which connects the inlet flue 4 and the outlet flue 7, and is provided with a third automatic damper 80.

[0050] The setting of the above three automatic dampers ensures the safety of system operation. When the system fails, such as the relay fan 6, the second automatic damper 50, etc. cannot be started, the first automatic damper 1 will be opened in time to discharge the smoke in the system, and an alarm will be issued; when the first automatic damper 1 also fails to open, the third automatic damper 80 will be started to open the emergency pressure relief flue 8 for pressure relief, and an alarm will be issued at the same time to link the entire asphalt mixing equipment to perform an emergency shutdown procedure.

[0051] The working process of the smoke dehumidification and desmog system of the asphalt mixing equipment of this embodiment is as follows:

[0052] When the flue gas temperature and humidity are both low, it is not necessary to activate this device, and the flue gas is directly discharged into the chimney 2 by the main induced draft fan 3. At this time, the first automatic damper 1 is in an open state, and the flue gas can be directly discharged into the atmosphere; when the flue gas temperature and humidity are both high, it is necessary to start this device, close the first automatic damper 1, open the second automatic damper 50, and start the relay fan 6 and the circulating water pump at the same time. The high-temperature and high-humidity flue gas enters the flue gas dehumidification equipment 5 through the inlet flue 4, and exchanges heat with the heat exchanger 53 of the flue gas dehumidification equipment 5. The water vapor in the flue gas is cooled and condensed into small droplets, which are collected in the condensate collection device 54 at the bottom of the flue gas dehumidification equipment 5, and then flow into the reclaimed water treatment system in the factory. The flue gas after cooling and dehumidification is discharged into the outlet flue 7 by the relay fan 6, and finally discharged into the atmosphere through the chimney 2.

[0053] After the cooling water exchanges heat with the flue gas in the flue gas dehumidification equipment 5, it flows into the heat-using equipment in the office building for heat recovery and reuse, and then the cooling water is transported to the cooling water pool for further cooling, and finally enters the cold water pool and is sent to the flue gas dehumidification equipment 5 again by the circulating water pump for heating and temperature increase.

[0054] 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. A smoke dehumidification and dewhitening system for asphalt mixing equipment, characterized by: It comprises a chimney (2) and a main induced draft fan (3), the inlet of the main induced draft fan (3) is connected to the smoke outlet of the stirring device, the chimney (2) is provided with a smoke inlet (20), and the outlet of the main induced draft fan (3) is connected to the smoke inlet (20); A first automatic damper (1) is arranged on the chimney (2) above the smoke inlet (20), a first interface (70) is arranged on the chimney (2) above the first automatic damper (1), and a second interface (40) is arranged on the chimney (2) below the first automatic damper (1); It also includes a flue gas dehumidification device (5) and a relay fan (6), wherein the inlet of the flue gas dehumidification device (5) is connected to an inlet flue (4), the end of the inlet flue (4) is connected to a second interface (40), the outlet of the flue gas dehumidification device (5) is connected to the inlet of the relay fan (6), the outlet of the relay fan (6) is connected to an outlet flue (7), and the end of the outlet flue (7) is connected to the first interface (70).

2. The asphalt mixing equipment smoke dehumidification and dewhitening system according to claim 1, characterized in that: The flue gas dehumidification equipment (5) comprises a shell (52), a heat exchanger (53) is arranged on the shell (52), a water inlet (5301) and a water outlet (5302) are arranged on the heat exchanger (53), cooling water flows inside the heat exchanger (53) for cooling water vapor in the flue gas, a cooling water inlet pipe (51) and a cooling water outlet pipe are arranged outside the shell (52), the cooling water inlet pipe (51) is connected to the water inlet (5301), and the cooling water outlet pipe is connected to the water outlet (5302); A condensed water collecting device (54) is disposed at the lower portion of the shell (52).

3. The asphalt mixing equipment smoke dehumidification and dewhitening system according to claim 2, characterized in that: The structure of the heat exchanger (53) is as follows: it comprises a first end cap (5303) and a second end cap (5304) which are arranged opposite to each other; the first end cap (5303) and the second end cap (5304) are both rectangular shell structures; a plurality of fin tubes (5305) are arranged side by side between the first end cap (5303) and the second end cap (5304); each fin tube (5305) connects the first end cap (5303) and the second end cap (5304); The water inlet (5301) and the water outlet (5302) are respectively arranged at the two ends of the first head (5303), and a plurality of partitions are arranged inside the first head (5303) and the second head (5304). The partitions are used to change the flow direction of the cooling water so that the cooling water enters from the water inlet (5301), flows through a plurality of fin tubes (5305) in sequence, and then flows out from the water outlet (5302).

4. The asphalt mixing equipment smoke dehumidification and dewhitening system according to claim 3, characterized in that: The heat exchangers (53) are multiple in number and are stacked on the shell (52) from top to bottom.

5. The asphalt mixing equipment smoke dehumidification and dewhitening system according to claim 4, characterized in that: It also includes a connecting plate (5306), which is used to connect the first head (5303) and the second head (5304) to form a rectangular frame. Rectangular connecting flanges (5307) are provided on both sides of the rectangular frame, and the rectangular connecting flanges (5307) of two adjacent heat exchangers (53) are sealed and connected.

6. The asphalt mixing equipment smoke dehumidification and dewhitening system according to claim 2, characterized in that: It also includes a cold water tank for storing cooling water and a circulating water pump, wherein the circulating water pump is used to pump the cooling water into a cooling water inlet pipe (51), wherein the cooling water inlet pipe (51) is connected to a heat-using device, and the heat-using device is used to recover heat from the cooling water; It also includes a cooling water pool for further cooling the cooling water. The heat-using equipment is connected to the cooling water pool, and the cooling water pool is connected to the cold water pool for supplying cooling water to the cold water pool.

7. The asphalt mixing equipment smoke dehumidification and dewhitening system according to claim 1, characterized in that: The inlet of the flue gas dehumidification equipment (5) is provided with a second automatic damper (50), and the second automatic damper (50) is connected to the inlet flue (4).

8. The asphalt mixing equipment smoke dehumidification and dewhitening system according to claim 1, characterized in that: It also comprises an emergency pressure relief flue (8), wherein the emergency pressure relief flue (8) connects the inlet flue (4) and the outlet flue (7), and a third automatic damper (80) is arranged on the emergency pressure relief flue (8).

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