County domestic garbage drying system utilizing pyrolysis flue gas waste heat

Abstract

The utility model discloses a county domestic garbage drying system utilizing pyrolysis flue gas waste heat. The county domestic garbage drying system comprises a rotary dryer, a gas-water separator and an activated carbon box. The rotary dryer comprises a rotary drying cylinder, a feeding device and a discharging device, the front end of the rotary drying cylinder is rotatably connected with the feeding device, the rear end of the rotary drying cylinder is rotatably connected with the discharging device, the feeding device is provided with a second garbage inlet and a first smoke inlet, and the discharging device is provided with a second garbage outlet and a first smoke outlet; a second flue gas inlet of the gas-water separator is connected with the first flue gas outlet, and a water outlet of the gas-water separator is connected with the garbage pyrolysis system; and a third flue gas inlet of the activated carbon box is connected with a second flue gas outlet of the gas-water separator. After garbage is dried by pyrolysis flue gas, gas-water separation is carried out in the gas-water separation machine, waste water is sprayed back to the pyrolysis gasification system for recycling, dry gas is discharged after being purified in the activated carbon box, no waste water is generated, and surrounding air is not affected.

Description

Technical Field

[0001] This utility model relates to the field of municipal solid waste treatment technology, specifically to a county-level municipal solid waste drying system that utilizes the waste heat from pyrolysis flue gas. Background Technology

[0002] With the development of waste treatment technology, the disposal of municipal solid waste has shifted from landfill to incineration. Among these technologies, pyrolysis gasification in waste incineration can not only achieve the harmlessness, reduction, and resource recovery of waste, but also solve the pollution problems caused by waste incineration, and has great development prospects.

[0003] In the application of pyrolysis gasification systems in counties and below, the domestic waste in villages and towns is not sorted and contains a large amount of kitchen waste and waste generated during rural planting. This waste has a high water content, and conventional treatment is drying. However, biological fermentation drying has a long cycle and requires a certain amount of stock, which increases the scale of the pretreatment workshop. Secondly, the drying process is greatly affected by weather factors. Finally, the water content of the waste entering the system is uncontrollable, which affects the operating efficiency of the gasification system.

[0004] In the prior art, CN 218626856 U discloses a municipal solid waste drying pretreatment system. The drying gas produced by this device is mixed with flue gas, and the lack of independent emission will increase the oxygen content in the flue gas. CN 116592597B discloses a drying device for municipal solid waste treatment. The drying gas produced by this device is not purified and treated, and the untreated emission will affect air quality. Utility Model Content

[0005] Therefore, this utility model provides a county-level domestic waste drying system that utilizes the waste heat of pyrolysis flue gas. The waste heat of pyrolysis flue gas is used to reduce the moisture content of domestic waste. The gas used for drying is purified before being discharged. The moisture generated during drying is sprayed back into the gasifier. This system does not produce wastewater or waste gas.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A county-level municipal solid waste drying system utilizing waste heat from pyrolysis flue gas includes a rotary dryer, a gas-liquid separator, and an activated carbon box;

[0008] The rotary dryer includes a rotary drying drum, a feeding device, and a discharging device. The front end of the rotary drying drum is rotatably connected to the feeding device, and the rear end of the rotary drying drum is rotatably connected to the discharging device. The feeding device is provided with a second waste inlet and a first flue gas inlet, and the discharging device is provided with a second waste outlet and a first flue gas outlet.

[0009] The second flue gas inlet of the gas-water separator is connected to the first flue gas outlet, and the drain outlet of the gas-water separator is connected to the waste pyrolysis system.

[0010] The third flue gas inlet of the activated carbon box is connected to the second flue gas outlet of the gas-water separator.

[0011] Furthermore, at least two rolling rings are provided on the periphery of the rotary drying drum, and a gear ring is provided between the two rolling rings. A drag wheel is provided below the rolling rings, and the rolling rings roll and abut against the drag wheel. A rotary motor is provided below the gear ring, and a gear that meshes with the gear ring is provided on the motor shaft of the rotary motor.

[0012] Furthermore, the rotary drying drum is inclined in a front-high-rear-low configuration, with its axis forming an angle of 2-4° with the horizontal plane; multiple rings of lifting plates are arranged inside the rotary drying drum, the length direction of the lifting plates is parallel to the axis of the rotary drying drum, and the width direction of the lifting plates forms an angle of 20-40° with the radial direction of the rotary drying drum.

[0013] Furthermore, the gas-water separator includes a housing, multiple filter pipes, and filter elements; a second flue gas inlet is provided on one side of the housing, a second flue gas outlet is provided on the other side, a drain outlet is provided at the bottom, and a drain pipe is installed at the drain outlet; the filter pipes are vertically arranged inside the housing, and a gap is left between the bottom of the filter pipes and the bottom of the housing; the top of the filter pipes is connected to the gas outlet of the housing; the filter elements are arranged at the bottom opening of the filter pipes.

[0014] Furthermore, the activated carbon box includes a box body, multiple activated carbon plates, and activated carbon; a third flue gas inlet is provided on one side of the box body, and a purified gas outlet is provided on the other side; multiple activated carbon plates are spaced apart inside the box body; the activated carbon is filled on the activated carbon plates.

[0015] Furthermore, the county-level domestic waste drying system also includes a screw feeder, which is equipped with a first waste outlet and is connected to a second waste inlet.

[0016] Furthermore, the screw feeder includes a feed cylinder, a feed motor, and screw blades; the feed cylinder is arranged horizontally, the front end of the feed cylinder is closed, a first waste inlet is provided on the upper front side, a feed hopper is provided at the first waste inlet, and a first waste outlet is provided at the rear end, and the rear end of the feed cylinder is fixed on the feeding device; the feed motor is located at the front end of the feed cylinder; the screw blades are rotatably arranged inside the feed cylinder, and the front end of the screw blades extends out of the front end of the feed cylinder and is drivenly connected to the feed motor.

[0017] This utility model has the following advantages:

[0018] This utility model provides a county-level municipal solid waste drying system utilizing the waste heat of pyrolysis flue gas. It fully utilizes the waste heat to dry municipal solid waste with high moisture content, while waste with low moisture content improves the reaction efficiency of the pyrolysis gasification system. After drying, the pyrolysis flue gas is purified before being discharged, avoiding impact on surrounding air quality. The dried flue gas is dehydrated in a gas-liquid separator, and the wastewater is recycled back to the pyrolysis gasification system, resulting in no wastewater generation. This system is suitable for municipal solid waste pyrolysis gasification in county-level and lower-level areas, consuming less energy, achieving good drying results, and being environmentally friendly.

[0019] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0020] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0022] Figure 1 A schematic diagram of a county-level domestic waste drying system utilizing waste heat from pyrolysis flue gas, provided for an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the rotary drying cylinder of a county-level domestic waste drying system that utilizes waste heat from pyrolysis flue gas, provided as an embodiment of this utility model.

[0024] In the diagram: 1. Rotary dryer; 11. Roller ring; 12. Rotary drying drum; 12-1. Lifting plate; 13. Gear ring; 14. Base; 15. Drag wheel; 16. Rotary motor; 17. Base; 18. Discharge device; 19. Feeding device; 110. Gear; 111. Support; 2. Screw feeder; 21. Feed hopper; 22. Feeding motor; 23. Screw blades; 3. Air-water separator; 31. Drain pipe; 32. Filter pipe; 33. Filter element; 4. Activated carbon box; 41. Activated carbon plate; 42. Activated carbon. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0026] like Figure 1 and 2 As shown, this embodiment provides a county-level domestic waste drying system that utilizes the waste heat from pyrolysis flue gas, including a rotary dryer 1, a gas-water separator 3, and an activated carbon box 4.

[0027] The rotary dryer 1 includes a rotary drying drum 12, a feeding device 19, and a discharging device 18. The rotary drying drum 12 is used to mix municipal solid waste and pyrolysis flue gas. The high temperature of the pyrolysis flue gas is used to bake out the moisture from the municipal solid waste, which is then discharged with the cooled flue gas (low-temperature flue gas). The front end of the rotary drying drum 12 is rotatably connected to the feeding device 19, and the rear end of the rotary drying drum 12 is rotatably connected to the discharging device 18. The feeding device 19 is provided with a second waste inlet and a first flue gas inlet; exemplaryly, the second waste inlet is collinear with or parallel to the axis of the rotary drying drum 12, and the first flue gas inlet is perpendicular to the axis of the rotary drying drum 12. Generally, the first flue gas inlet is located on the side of the feeding device 19. The discharging device 18 is provided with a second waste outlet for discharging the dried waste and a first flue gas outlet for discharging the low-temperature flue gas; exemplaryly, the second waste outlet is located at the bottom for easy discharge of the dried waste; the first flue gas outlet is located at the top for easy discharge of the flue gas.

[0028] The second flue gas inlet of the gas-water separator 3 is connected to the first flue gas outlet to dehydrate the incoming low-temperature flue gas (gas-water separation). The separated water collects at the bottom of the gas-water separator 3 and is discharged from the bottom drain outlet. A drain pipe 31 is installed at the drain outlet, and a flange is installed at the end of the drain pipe 31. The return water pipe is connected through the flange to recycle the wastewater into the waste pyrolysis system.

[0029] The third flue gas inlet of the activated carbon box 4 is connected to the second flue gas outlet of the gas-water separator 3 to remove odors from the dehydrated low-temperature flue gas (low-temperature dry flue gas) to form purified flue gas, which is then discharged from the purified gas outlet.

[0030] This embodiment provides a county-level municipal solid waste drying system utilizing the waste heat from pyrolysis flue gas. It fully utilizes the purified waste heat to dry municipal solid waste with high moisture content, while waste with low moisture content improves the reaction efficiency of the pyrolysis gasification system. After drying the waste, the pyrolysis flue gas is purified before being discharged, avoiding impact on surrounding air quality. The dried flue gas is dehydrated in a gas-liquid separator, and the wastewater is recycled back to the pyrolysis gasification system, resulting in no wastewater generation. This system is suitable for municipal solid waste pyrolysis gasification in county-level and lower-level areas, consuming less energy, achieving good drying results, and being environmentally friendly.

[0031] In this embodiment, at least two rolling rings 11 are arranged around the periphery of the rotary drying drum 12; exemplarily, one rolling ring 11 is located in the front middle section of the rotary drying drum 12, and the other rolling ring 11 is located in the rear middle section. A gear ring 13 is arranged between the two rolling rings 11; exemplarily, the gear ring 13 is located in the middle of the rotary drying drum 12. A roller 15 is arranged below the rolling rings 11, and the rolling rings 11 roll against the rollers 15. A rotary motor 16 is arranged below the gear ring 13, and a gear 110 that meshes with the gear ring 13 is arranged on the motor shaft of the rotary motor 16. Generally, the feeding device 19 and the discharging device are arranged on the support 111; the roller 15 and the rotary motor 16 are mounted on the base 14, and the base 14 is mounted on the base 17, which can share the base 14 and the base 17. Preferably, three bases 17 and three bases 14 are provided, so that the bases 17 and the base 14 can be smaller in size, which is convenient for processing, transportation, installation, etc. The rotary motor 16 is a variable frequency motor, which controls the rotation direction (clockwise or counterclockwise) and speed of the rotary drying drum 12 by different motor frequencies.

[0032] In this embodiment, the rotary drying cylinder 12 is inclined with a higher front and lower rear, and its axis makes an angle of 2-4° with the horizontal plane. This slight inclination is achieved by setting the support 111, base 17, base 14, and casters 15 at different heights. Generally, the angle between the rotary drying cylinder 12 and the horizontal plane is 3°. The inclined rotary drying cylinder 12, while causing the waste to tumble, also allows the waste to move backward, facilitating the smooth discharge of the dried waste. It can be seen that in this embodiment, the flue gas flow direction is consistent with the waste movement direction, and the heating method is co-current heating.

[0033] In this embodiment, multiple rings of lifting plates 12-1 are arranged inside the rotary drying drum 12. The length direction of the lifting plates 12-1 is parallel to the axis of the rotary drying drum 12, and the width direction of the lifting plates 12-1 forms an angle of 20-40° with the radial direction of the rotary drying drum 12. For example, the length of the lifting plate 12-1 is approximately 80cm, the width is approximately 15cm, and the width direction forms an angle of 30° with the radial direction of the rotary drying drum 12. The spacing between adjacent rings of lifting plates 12-1 is the same, and multiple lifting plates 12-1 in the same ring are evenly distributed circumferentially. By setting multiple rings of lifting plates 12-1, the waste inside the rotary drying drum 12 can be turned over, allowing the waste to mix or contact more fully with the pyrolysis flue gas, thus improving the drying effect. For example, the lifting plates 12-1 are arranged in 4, 5, or 6 rings.

[0034] In this embodiment, the gas-water separator 3 includes a housing, multiple filter pipes 32, and filter elements 33. A second flue gas inlet is located on one side of the housing, a second flue gas outlet on the other side, and a drain outlet at the bottom. A drain pipe 31 is installed at the drain outlet, and a flange is located at the lower end of the drain pipe 31. The filter pipes 32 are vertically arranged inside the housing, with a gap between the bottom of the filter pipes 32 and the bottom of the housing. The tops of all the filter pipes 32 converge and connect to the gas outlet of the housing. The filter elements 33 are located at the bottom opening of the filter pipes 32. The low-temperature flue gas exiting the rotary drying cylinder 12 contains a high moisture content. The flue gas enters the housing through the second flue gas inlet. When passing through the filter elements 33, the moisture in the flue gas is filtered out and falls to the bottom of the housing under gravity, exiting through the drain outlet. The drain outlet is connected to the gasifier, and the water separated from the flue gas is sprayed back into the gasifier. The flue gas passing through the filter elements 33 converges from the filter pipes 32 and exits through the second flue gas outlet.

[0035] In this embodiment, the activated carbon box 4 includes a box body, multiple activated carbon plates 41, and activated carbon 42. A third flue gas inlet is provided on one side of the box body, and a purified gas outlet is provided on the other side. Multiple activated carbon plates 41 are spaced apart within the box body. Activated carbon 42 is filled onto the activated carbon plates 41. The width of the activated carbon plates 41 is the same as the width of the box body, and the height of the activated carbon plates 41 is less than the height of the box body. The spacing between adjacent activated carbon plates 41 is the same. The bottom of odd-numbered (or even-numbered) activated carbon plates 41 is suspended, while the top of even-numbered (or odd-numbered) activated carbon plates 41 has space, thus forming an air passage between two activated carbon plates 41. The air passage is S-shaped, which increases the time the flue gas spends in the activated carbon box 4 and improves the adsorption effect. An installation groove is provided on the side of the activated carbon plate 41 for filling with activated carbon 42, which needs to be replaced periodically. Exemplarily, three, four, or five activated carbon plates 41 are provided.

[0036] In this embodiment, the county-level domestic waste drying system also includes a screw feeder 2, which has a first waste outlet connected to a second waste inlet. The screw feeder 2 stably supplies material to the rotary dryer 1. Specifically, the screw feeder 2 includes a feed cylinder, a feed motor 22, and screw blades 23. The feed cylinder is arranged horizontally, with its front end closed. A first waste inlet is located on the upper front side, and a feed hopper 21 is located at the first waste inlet. A first waste outlet is located at the rear end, and the rear end of the feed cylinder is fixed to the feeding device 19. The feed motor 22 is located at the front end of the feed cylinder. The screw blades 23 are rotatably disposed inside the feed cylinder, with their front ends extending beyond the front end of the feed cylinder and connected to the feed motor 22 for transmission. Preferably, the screw blades 23 are shaftless screws, which can reduce the occurrence of shaft entanglement accidents.

[0037] In the description of this specification, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0042] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A county-level municipal solid waste drying system utilizing waste heat from pyrolysis flue gas, characterized in that, It includes a rotary dryer (1), an air-water separator (3), and an activated carbon box (4); The rotary dryer (1) includes a rotary drying cylinder (12), a feeding device (19) and a discharging device (18). The front end of the rotary drying cylinder (12) is rotatably connected to the feeding device (19), and the rear end of the rotary drying cylinder (12) is rotatably connected to the discharging device (18). The feeding device (19) is provided with a second waste inlet and a first flue gas inlet, and the discharging device (18) is provided with a second waste outlet and a first flue gas outlet. The second flue gas inlet of the gas-water separator (3) is connected to the first flue gas outlet, and the drain outlet of the gas-water separator (3) is connected to the waste pyrolysis system. The third flue gas inlet of the activated carbon box (4) is connected to the second flue gas outlet of the gas-water separator (3).

2. The county-level domestic waste drying system utilizing waste heat from pyrolysis flue gas according to claim 1, characterized in that, The rotary drying drum (12) has at least two rolling rings (11) on its periphery, and a gear ring (13) is provided between the two rolling rings (11). A roller (15) is provided below the rolling rings (11), and the rolling rings (11) and the roller (15) roll against each other. A rotary motor (16) is provided below the gear ring (13), and a gear (110) that meshes with the gear ring (13) is provided on the motor shaft of the rotary motor (16).

3. The county-level domestic waste drying system utilizing waste heat from pyrolysis flue gas according to claim 1, characterized in that, The rotary drying drum (12) is inclined with a higher front and lower rear, and its axis makes an angle of 2-4° with the horizontal plane. Multiple rings of lifting plates (12-1) are arranged inside the rotary drying drum (12). The length direction of the lifting plate (12-1) is parallel to the axis of the rotary drying drum (12), and the width direction of the lifting plate (12-1) makes an angle of 20-40° with the radial direction of the rotary drying drum (12).

4. The county-level domestic waste drying system utilizing waste heat from pyrolysis flue gas according to claim 1, characterized in that, The gas-water separator (3) includes a shell, multiple filter pipes (32) and filter elements (33); a second flue gas inlet is provided on one side of the shell, a second flue gas outlet is provided on the other side, a drain outlet is provided at the bottom, and a drain pipe (31) is installed at the drain outlet; the filter pipes (32) are vertically arranged inside the shell, and a gap is left between the bottom of the filter pipes (32) and the bottom of the shell; the top of the filter pipes (32) is connected to the gas outlet of the shell; the filter elements (33) are located at the bottom opening of the filter pipes (32).

5. The county-level domestic waste drying system utilizing waste heat from pyrolysis flue gas according to claim 1, characterized in that, The activated carbon box (4) includes a box body, multiple activated carbon plates (41) and activated carbon (42); a third flue gas inlet is provided on one side of the box body and a purified gas outlet is provided on the other side; multiple activated carbon plates (41) are spaced apart in the box body; the activated carbon (42) is filled on the activated carbon plates (41).

6. The county-level domestic waste drying system utilizing waste heat from pyrolysis flue gas according to claim 1, characterized in that, The county-level domestic waste drying system also includes a screw feeder (2), which is equipped with a first waste outlet and is connected to a second waste inlet.

7. The county-level domestic waste drying system utilizing waste heat from pyrolysis flue gas according to claim 6, characterized in that, The screw feeder (2) includes a feed cylinder, a feed motor (22), and a screw blade (23). The feed cylinder is arranged horizontally, with its front end closed. A first waste inlet is provided on the upper front side, and a feed hopper (21) is provided at the first waste inlet. A first waste outlet is provided at the rear end, and the rear end of the feed cylinder is fixed on the feeding device (19). The feed motor (22) is located at the front end of the feed cylinder. The screw blade (23) is rotatably arranged inside the feed cylinder, and the front end of the screw blade (23) extends out of the front end of the feed cylinder and is connected to the feed motor (22) for transmission.

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