Flue gas circulation drying device

Abstract

The utility model discloses a kind of flue gas circulation drying devices, including the sealing drying bin (1) between garbage feeder and boiler and being arranged in inclined downward, the lower part of sealing drying bin (1) low end is equipped with pressure-equalizing air distribution chamber (2), pressure-equalizing air distribution chamber (2) is connected with boiler hearth smoke outlet by high-temperature induced draft pipe (3), the upper side of sealing drying bin (1) high end is equipped with gas outlet (4), gas outlet (4) is connected to boiler primary air inlet by return air pipe (5);The sealing drying bin (1) is also equipped with material turning mechanism (6) in. The utility model can reduce energy consumption and the characteristics of reducing secondary pollution.

Description

Technical Field

[0001] This utility model relates to a flue gas circulation drying device, and more particularly to a flue gas circulation drying device. Background Technology

[0002] Waste-to-energy incineration is an important way to reduce, render harmless, and recycle municipal solid waste. However, waste typically contains high moisture content, and directly incinerating high-moisture waste can lead to a series of problems (such as lower furnace temperature and increased energy consumption). To address the issue of high moisture content, waste is usually pre-dried. Common pre-drying methods, such as independent hot air drying, suffer from high energy consumption and the potential for secondary pollution. Therefore, there is an urgent need to develop a waste drying device that can reduce energy consumption and secondary pollution, which would effectively meet the needs of waste-to-energy incineration plants. Summary of the Invention

[0003] The purpose of this invention is to provide a flue gas recirculation drying device. This invention can reduce energy consumption and secondary pollution.

[0004] The technical solution of this utility model is as follows: a flue gas circulation drying device, including a sealed drying chamber located between the garbage feeder and the boiler and arranged at an inclined downward direction. A pressure equalization air distribution chamber is provided below the lower end of the sealed drying chamber. The pressure equalization air distribution chamber is connected to the flue gas outlet of the boiler furnace through a high-temperature induced draft pipe. An air outlet is provided above the upper end of the sealed drying chamber. The air outlet is connected to the primary air inlet of the boiler through a return air pipe. The sealed drying chamber is also equipped with a material turning mechanism.

[0005] In the aforementioned flue gas circulating drying device, a first air volume regulating valve and a first high-temperature circulating fan are installed in the high-temperature induced draft duct.

[0006] In the aforementioned flue gas circulating drying device, a second air volume regulating valve and a second high-temperature circulating fan are installed in the return air duct.

[0007] In the aforementioned flue gas recirculation drying device, the pressure equalization air distribution chamber includes a pressure equalization chamber located outside the sealed drying chamber. The surface of the pressure equalization chamber is provided with an air distribution plate, and multiple air caps located inside the sealed drying chamber are connected to the surface of the air distribution plate. The air caps are provided with air outlet holes.

[0008] In the aforementioned flue gas recirculation drying device, the turning mechanism includes multiple turning rakes independently distributed within the sealed drying chamber and perpendicular to the sealed drying chamber. The ends of the turning rakes are connected to drive motors located outside the sealed drying chamber. Each turning rake includes a rotating main rod with inclined rake teeth. The inclination angles of the rake teeth on adjacent turning rakes are opposite.

[0009] In the aforementioned flue gas circulating drying device, the sealed drying chamber includes a chamber body, with a pre-storage pipe section and a pre-discharge pipe section respectively provided at the upper and lower ends of the chamber body. The inlet and outlet of the pre-storage pipe section and the pre-discharge pipe section are both equipped with high-temperature resistant electric gate valves.

[0010] Compared with existing technologies, this invention features a downwardly oriented, sealed drying chamber between the waste feeder and the boiler inlet. The lower end of the sealed drying chamber houses a pressure-equalizing air distribution chamber connected to the boiler furnace exhaust port, while the upper end houses an air outlet and a return air pipe connected to the boiler's primary air inlet. This fully utilizes the high-temperature flue gas generated by the boiler to preheat the waste, and the moistened flue gas is then returned to the boiler for combustion. This effectively improves energy efficiency, reduces energy consumption, and minimizes pollutant emissions. Furthermore, the addition of a turning mechanism improves the uniformity of waste drying. In summary, this invention reduces energy consumption and secondary pollution. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0012] The labels in the attached diagram are as follows: 1-Sealed drying chamber, 2-Pressure equalization air distribution chamber, 3-High-temperature exhaust duct, 4-Air outlet, 5-Return air duct, 6-Tilting mechanism, 7-First air volume regulating valve, 8-First high-temperature circulating fan, 9-Second air volume regulating valve, 10-Second high-temperature circulating fan, 21-Pressure equalization chamber, 22-Air distribution plate, 23-Air cap, 61-Tilting rake, 62-Drive motor, 611-Rotating main rod, 612-Rake teeth, 11-Chamber body, 12-Pre-storage pipe section, 13-Pre-release pipe section, 14-High-temperature resistant electric gate valve. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0014] Example. A flue gas recirculation drying device, configured as follows: Figure 1-2 As shown, the sealed drying chamber 1 is located between the waste feeder and the boiler and is arranged at an angle downwards. A pressure equalization air distribution chamber 2 is provided below the lower end of the sealed drying chamber 1. The pressure equalization air distribution chamber 2 is connected to the flue gas outlet of the boiler furnace through a high-temperature air duct 3. An air outlet 4 is provided above the upper end of the sealed drying chamber 1. The air outlet 4 is connected to the primary air inlet of the boiler through a return air pipe 5. The sealed drying chamber 1 is also equipped with a material turning mechanism 6.

[0015] The high-temperature exhaust duct 3 is equipped with a first air volume regulating valve 7 and a first high-temperature circulating fan 8.

[0016] The return air duct 5 is equipped with a second air volume regulating valve 9 and a second high-temperature circulating fan 10.

[0017] The pressure equalization air distribution chamber 2 includes a pressure equalization chamber 21 located outside the sealed drying chamber 1. The surface of the pressure equalization chamber 21 is provided with an air distribution plate 22. Multiple air caps 23 located inside the sealed drying chamber 1 are connected to the surface of the air distribution plate 22. The air caps 23 are provided with air outlet holes.

[0018] The turning mechanism 6 includes multiple turning rakes 61 that are independently distributed inside the sealed drying chamber 1 and perpendicular to the sealed drying chamber 1. The ends of the turning rakes 61 are connected to drive motors 62 located outside the sealed drying chamber 1. The turning rakes 61 include a rotating main rod 611, on which are inclined rake teeth 612. The inclination angles of the rake teeth 612 on adjacent turning rakes 61 are opposite.

[0019] The sealed drying chamber 1 includes a chamber body 11. The upper and lower ends of the chamber body 11 are respectively provided with a pre-storage pipe section 12 and a pre-discharge pipe section 13. The inlet and outlet of the pre-storage pipe section 12 and the pre-discharge pipe section 13 are both provided with high-temperature resistant electric gate valves 14.

[0020] The pressure equalization air distribution chamber 2 and the air outlet 4 are connected to the corresponding areas of the chamber body 11.

[0021] Meanwhile, the sealed drying chamber is located between the waste feeder and the boiler inlet, which enables continuous operation, improves drying efficiency, and reduces equipment size.

[0022] Preferably, the heights of the multiple hoods can be different.

[0023] The hood is mushroom-shaped.

[0024] The vent cap has multiple air outlets to ensure that hot air penetrates the material layer evenly and at a low speed.

[0025] The drying process of this invention is as follows: The mixed waste fuel (a mixture of waste and coal) is fed into an inclined, sealed drying chamber via a feeder. Simultaneously, high-temperature flue gas at approximately 900°C from the boiler furnace outlet is drawn through an intake port into a high-temperature induced draft pipe. The flow rate is controlled by a flow regulating valve and transported by a high-temperature circulating fan. Subsequently, the flue gas enters the pressure equalization air distribution chamber at the bottom of the drying chamber, and is evenly distributed upwards through the waste-fuel mixture layer continuously agitated by the turning mechanism via an air cap.

[0026] During this process, the high-temperature flue gas exchanges heat with the waste-to-fuel mixture, causing the moisture in the mixture to evaporate and the temperature to rise. The pre-dried waste-to-fuel mixture then falls from the bottom of the sealed drying chamber into the boiler feed inlet and enters the furnace for combustion.

[0027] The treated high-humidity flue gas is discharged from the outlet at the top of the drying chamber, and then drawn into the boiler's primary air system through the return air duct, returning to the boiler's high-temperature zone. The trace pollutants contained therein are further combusted, realizing the circulation of flue gas and effectively reducing pollutant emissions during the drying process.

[0028] The operation process of the sealed drying chamber is as follows: First, open the high-temperature resistant electric gate valve at the inlet of the pre-storage pipe section, and close the other gate valves. The mixed waste fuel enters the pre-storage pipe section for storage. Then, close the high-temperature resistant electric gate valve at the inlet of the pre-storage pipe section and open the high-temperature resistant electric gate valve at the outlet of the pre-storage pipe section (close the other gate valves). After the mixed waste fuel enters the sealed drying chamber, close the high-temperature resistant electric gate valve at the outlet of the pre-storage pipe section (close the other gate valves, open the high-temperature resistant electric gate valve at the inlet of the pre-storage pipe section to feed the fuel, and close it after feeding is completed to carry out pre-drying. After the pre-drying is completed, close the high-temperature resistant electric gate valve at the outlet of the pre-storage pipe section and open the electric gate valve at the inlet of the pre-discharge pipe section to start discharging the fuel. After discharging is completed, close the electric gate valve at the inlet of the pre-discharge pipe section and open the electric gate valve at the outlet of the pre-discharge pipe section to achieve discharge, thereby ensuring the sealing of the chamber during drying.

[0029] The working process of the material turning mechanism: The drive motor works, which drives the material turning rake to rotate and turn the material in the sealed drying chamber. The rake teeth on multiple adjacent material turning rakes are tilted at opposite angles, which can realize the turning of materials in different directions.

Claims

1. A flue gas circulating drying device, characterized in that: The sealed drying chamber (1) is located between the waste feeder and the boiler and is arranged at an angle downwards. The lower end of the sealed drying chamber (1) is provided with a pressure equalization air distribution chamber (2). The pressure equalization air distribution chamber (2) is connected to the flue gas outlet of the boiler furnace through a high-temperature air duct (3). The upper end of the sealed drying chamber (1) is provided with an air outlet (4). The air outlet (4) is connected to the primary air inlet of the boiler through a return air pipe (5). The sealed drying chamber (1) is also provided with a material turning mechanism (6).

2. The flue gas circulating drying device according to claim 1, characterized in that: The high-temperature exhaust duct (3) is equipped with a first air volume regulating valve (7) and a first high-temperature circulating fan (8).

3. The flue gas circulating drying device according to claim 1, characterized in that: The return air duct (5) is equipped with a second air volume regulating valve (9) and a second high temperature circulating fan (10).

4. The flue gas circulating drying device according to claim 1, characterized in that: The pressure equalization air distribution chamber (2) includes a pressure equalization chamber (21) located outside the sealed drying chamber (1). The surface of the pressure equalization chamber (21) is provided with an air distribution plate (22). Multiple air caps (23) located inside the sealed drying chamber (1) are connected to the surface of the air distribution plate (22). Air outlet holes are provided on the air caps (23).

5. The flue gas circulating drying device according to claim 1, characterized in that: The turning mechanism (6) includes multiple turning rakes (61) that are independently distributed inside the sealed drying chamber (1) and perpendicular to the sealed drying chamber (1). The ends of the turning rakes (61) are connected to a drive motor (62) located outside the sealed drying chamber (1). The turning rakes (61) include a rotating main rod (611) with inclined rake teeth (612) on the rotating main rod (611). The inclination angles of the rake teeth (612) on adjacent turning rakes (61) are opposite.

6. The flue gas circulating drying device according to claim 1, characterized in that: The sealed drying chamber (1) includes a chamber body (11). The upper and lower ends of the chamber body (11) are respectively provided with a pre-storage pipe section (12) and a pre-discharge pipe section (13). The inlet and outlet of the pre-storage pipe section (12) and the pre-discharge pipe section (13) are both provided with high-temperature resistant electric gate valves (14).

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