Dehumidification coal conveying device for thermal power generation

Abstract

The utility model relates to the technical field of flue gas treatment, in particular to a dehumidification coal conveying device for thermal power generation. Comprising a supporting frame, a conveying cover is rotatably connected to the interior of the supporting frame, an oil bath box is fixedly connected to the bottom of the conveying cover, the oil bath box is filled with oil, a conveying cavity is formed between the upper surface of the oil bath box and the lower side of the conveying cover, and a conveying motor is fixedly connected to one side of the conveying cover; and an output shaft of the conveying motor extends into the conveying cavity and is coaxially and fixedly connected with a main shaft. In the utility model, when the auger blade conveys pulverized coal in the conveying cavity towards the direction close to the discharge pipe, the oil in the oil bath box heats the upper box plate, and the upper box plate heats the pulverized coal to quickly evaporate moisture in the pulverized coal, so that the humidity of the pulverized coal discharged out of the conveying cavity from the discharge pipe is reduced, and the pulverized coal is prevented from being adhered to the inner wall of a boiler coal feeding pipeline; and meanwhile, by drying the pulverized coal, sufficient combustion of the pulverized coal is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power generation, in particular to a dehumidifying coal conveying device for thermal power generation. Background Art

[0002] Thermal power generation is a method of power generation that uses the heat energy generated by the combustion of combustibles to convert it into electrical energy through a power generation device. The combustibles used in thermal power generation are usually pulverized coal processed from coal.

[0003] Due to the limitations of coal storage conditions, pulverized coal is often wetted by rain, snow or other factors, which often leads to some problems in the coal transportation system. For example, it is difficult to drop coal, resulting in coal shortage during the boiler feeding process, and even the boiler shutting down due to lack of coal. At the same time, if the coal is too wet, it is not conducive to combustion and affects the thermal efficiency of the boiler. Therefore, a drying device is needed to dry the wet pulverized coal before it is transported to the boiler for combustion.

[0004] Existing drying devices generally transport coal powder to the interior of the drying equipment through a conveyor belt. During the transportation process, the coal powder accumulates on the conveyor belt and remains stationary relative to the conveyor belt, making it difficult for the coal powder that is far away from the heat source of the drying equipment to be heated and heated. This causes uneven heating of the coal powder, and it is difficult to maintain a consistent dryness of the coal powder at the transportation point from the drying equipment. As a result, the coal powder entering the boiler cannot be fully burned. In view of this, we propose a dehumidifying coal conveying device for thermal power generation. Summary of the Invention

[0005] The purpose of the utility model is to provide a dehumidifying coal conveying device for thermal power generation, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, one of the objectives of the present invention is to provide a dehumidifying coal conveying device for thermal power generation, including a support frame, a conveying cover rotatably connected to the inside of the support frame, an oil bath box fixedly connected to the bottom of the conveying cover, the interior of the oil bath box is filled with oil, a conveying chamber is set between the upper surface of the oil bath box and the lower side of the conveying cover, a conveying motor is fixedly connected to one side of the conveying cover, the output shaft of the conveying motor extends to the inside of the conveying chamber and is coaxially fixedly connected to the main shaft, an auger blade is fixedly connected to the side wall of the main shaft, both ends of the main shaft are rotatably arranged with the inner wall of the conveying cover, a hot oil circulation mechanism is provided on the oil bath box, the hot oil circulation mechanism heats the oil inside the oil bath box and circulates the oil inside the oil bath box, and a swing mechanism is provided on the support frame, and the swing mechanism is used to drive the oil bath box to swing.

[0007] As a further improvement of the present technical solution, the swing mechanism includes a dual-axis motor fixedly connected to the upper surface of the support frame, the two output shafts of the dual-axis motor are coaxially fixedly connected to an extension rod, the other end of the extension rod is fixedly connected to a turntable, and the two turntables are eccentrically fixedly connected to a positioning rod on the side away from each other, and the lower surface of the oil bath box is symmetrically fixedly connected to two sleeves, and the positioning rods are slidably set in the corresponding sleeves.

[0008] As a further improvement of the present technical solution, the hot oil circulation mechanism includes a circulation pump fixedly connected to one side of the oil bath tank, and an oil extraction pipe and an oil discharge pipe are fixedly connected to both sides of the circulation pump, respectively. The other ends of the oil extraction pipe and the oil discharge pipe pass through the opposite side walls of the oil bath tank, and the oil extraction pipe and the oil discharge pipe are fixed on the oil bath tank. An electric heater is fixedly connected to one side of the oil bath tank, and one end of the electric heater extends to the interior of the oil bath tank.

[0009] As a further improvement of the present technical solution, a filling pipe is fixedly connected to one side of the oil bath box near the top, a pressure relief valve is fixedly connected to the upper end of the filling pipe, and a plurality of air outlet slots are provided in a horizontal array on the top of the conveying cover.

[0010] As a further improvement of the present technical solution, a feed pipe is fixedly connected to a position near one side of the top of the conveying hood, and a discharge pipe is fixedly connected to a position near the bottom end of the other side of the conveying hood. The upper surface of the oil bath box is set as a concave arc surface, and the auger blades are in contact with the upper surface of the oil bath box.

[0011] As a further improvement of the present technical solution, a plurality of stirring rods are fixedly connected to the side wall of the main shaft in a transverse array, and the stirring rods are arranged between two adjacent blades of the auger blade.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This dehumidifying coal conveying device for thermal power generation uses an oil bath to heat the upper plate when the auger blades convey the pulverized coal in the conveying chamber toward the discharge pipe. This heats the pulverized coal, causing the moisture in the pulverized coal to evaporate rapidly. This reduces the humidity of the pulverized coal discharged from the discharge pipe into the conveying chamber, preventing the pulverized coal from adhering to the inner wall of the boiler's coal feed pipe, which could cause a coal shortage in the boiler. Drying the pulverized coal also helps ensure its full combustion.

[0014] 2. In this dehumidifying coal conveying device for thermal power generation, when the oil bath box swings and tilts, the coal powder on the upper surface of the oil bath box slides to the lower side, thereby expanding the flattening area of ​​the coal powder on the upper surface of the oil bath box, increasing the contact area between the coal powder and the upper box plate of the oil bath box, and improving the drying efficiency of the upper box plate for the coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is one of the cross-sectional views of the overall structure of the utility model;

[0017] Figure 3 This is the second cross-sectional view of the overall structure of the utility model;

[0018] Figure 4 This is the third cross-sectional view of the overall structure of the utility model;

[0019] Figure 5 It is an exploded view of the overall structure of the utility model;

[0020] Figure 6 This is a schematic structural diagram of the auger blades and stirring rod of the present utility model;

[0021] Figure 7 This is a structural diagram of the oil bath box and conveying cover of the utility model.

[0022] The meaning of each number in the figure is:

[0023] 1. Support frame; 2. Oil bath box;

[0024] 3. Conveying cover; 31. Feed pipe; 32. Discharge pipe; 33. Air outlet trough;

[0025] 4. Conveying motor; 5. Main shaft; 51. Auger blade; 52. Stirring rod;

[0026] 6. Swing mechanism; 61. Dual-axis motor; 62. Extension rod; 63. Turntable; 64. Positioning rod; 65. Frame;

[0027] 7. Hot oil circulation mechanism; 71. Circulation pump; 72. Electric heater; 73. Filling pipe. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0029] See also Figure 1 、 Figure 2 and Figure 7As shown, one of the purposes of this embodiment is to provide a dehumidification coal conveying device for thermal power generation, including a support frame 1, a conveying cover 3 is rotatably connected inside the support frame 1, and an oil bath box 2 is fixedly connected to the bottom of the conveying cover 3. The interior of the oil bath box 2 is filled with oil, preferably silicone oil, which is heated in an oil bath, and its temperature can be heated to 300 degrees Celsius. At present, when heating and drying the coal powder after absorbing water, electric heating wires are usually used to heat and dry the coal powder. In order to increase the speed of drying the coal powder and increase the drying area of ​​the device, a larger area of ​​electric heating wires will be laid to increase the heating range of the electric heating wires. However, the use of a large number of heating wires is not only costly, but also consumes a lot of electricity when in use. For this reason, this solution adopts oil bath heating to expand the heating area and reduce electricity consumption.

[0030] At the same time, a hot oil circulation mechanism 7 is provided on the oil bath box 2. The hot oil circulation mechanism 7 heats the oil inside the oil bath box 2 and circulates the oil inside the oil bath box 2, so that the oil inside the oil bath box 2 is evenly heated, and the box plate of the oil bath box 2 is evenly heated by heat exchange with the heated oil. The plate at the top of the oil bath box 2 is set as an upper box plate, and a conveying cavity is set between the upper surface of the upper box plate of the oil bath box 2 and the lower side of the conveying cover 3. A conveying motor 4 is fixedly connected to one side of the conveying cover 3. The output shaft of the conveying motor 4 extends to the inside of the conveying cavity and is coaxially fixedly connected to the main shaft 5. An auger blade 51 is fixedly connected to the side wall of the main shaft 5. Both ends of the main shaft 5 are rotatably arranged with the inner wall of the conveying cover 3. After the conveying motor 4 is started, its output shaft drives the auger blade 51 to rotate. A feed pipe 31 is fixedly connected to the top of the conveying cover 3 near one side. A discharge pipe 32 is fixedly connected to the position near the bottom end on the other side. The upper surface of the oil bath box 2 is configured as a concave arc surface. The auger blades 51 are in contact with the upper surface of the oil bath box 2. After the wet coal powder is fed into the conveying chamber through the feed pipe 31, the rotating auger blades 51 convey the wet coal powder falling on the upper surface of the oil bath box 2 toward the discharge pipe 32. During the conveying process, the wet coal powder is heated due to contact with the upper box plate of the heated oil bath box 2, thereby accelerating the evaporation of moisture in the wet coal powder. A plurality of air outlet slots 33 are provided in a transverse array on the top of the conveying cover 3. The water vapor evaporated from the wet coal powder is discharged from the conveying chamber through the air outlet slots 33, thereby reducing the humidity of the coal powder discharged from the conveying chamber from the discharge pipe 32, thereby preventing the coal powder from adhering to the inner wall of the boiler coal feeding pipe due to moisture, resulting in a coal shortage in the boiler. At the same time, drying the coal powder is conducive to the full combustion of the coal powder.

[0031] The structure of the hot oil circulation mechanism 7 is detailed below. Figure 3 and Figure 4The hot oil circulation mechanism 7 includes a circulation pump 71 fixedly connected to one side of the oil bath tank 2, and an oil extraction pipe and an oil discharge pipe are fixedly connected to both sides of the circulation pump 71. The other ends of the oil extraction pipe and the oil discharge pipe pass through the opposite side walls of the oil bath tank 2 respectively, and the oil extraction pipe and the oil discharge pipe are fixed on the oil bath tank 2. An electric heater 72 is fixedly connected to one side of the oil bath tank 2, and one end of the electric heater 72 extends to the interior of the oil bath tank 2. After the electric heater 72 is started, the oil inside the oil bath tank 2 is heated and kept warm to a predetermined temperature. After the circulation pump 71 is started, the hot oil inside the oil bath tank 2 is extracted through the oil extraction pipe, and the hot oil is injected into the interior of the oil bath tank 2 through the oil discharge pipe, thereby realizing the circulation of the hot oil inside the oil bath tank 2, so that the oil bath tank 2. The oil inside the oil bath tank 2 is evenly heated, and the evenly heated oil evenly heats the upper box plate of the oil bath tank 2 through heat exchange, thereby heating and drying the pulverized coal in contact with the upper box plate. A filling pipe 73 is fixedly connected to a position near the top of one side of the oil bath tank 2, and a pressure relief valve is fixedly connected to the upper end of the filling pipe 73. The oil vapor generated after the oil inside the oil bath tank 2 is heated can be discharged through the pressure relief valve to avoid the inside of the oil bath tank 2 being in a high-pressure state. When the oil amount inside the oil bath tank 2 decreases, the pressure relief valve can be removed and oil can be added to the oil bath tank 2 through the filling pipe 73 to ensure that the oil inside the oil bath tank 2 contacts the upper box plate of the oil bath tank 2, so that the hot oil continues to heat the upper box plate of the oil bath tank 2, thereby avoiding a decrease in the drying efficiency of the pulverized coal by the oil bath tank 2.

[0032] When the auger blades 51 convey the coal powder, it is difficult for the auger blades 51 to flatten the coal powder to a larger area, and the coal powder accumulates at a high height during the conveying process. The coal powder at a high position is difficult to be heated because it is far away from the upper box plate of the oil bath box 2, which makes it impossible for the oil bath box 2 to heat and dry the coal powder evenly. To solve this problem, a swing mechanism 6 is provided on the support frame 1. The swing mechanism 6 is used to drive the oil bath box 2 to swing, so that the material in the oil bath box 2 is shaken, so that the coal powder at the bottom of the oil bath box 2 can contact the side of the oil bath box 2, thereby expanding the flattening area of ​​the coal powder on the upper surface of the oil bath box 2, making it easier for the oil bath box 2 to dry the coal powder. The structure of the swing mechanism 6 is detailed below, with reference to Figure 5The swing mechanism 6 includes a double-axis motor 61 fixedly connected to the upper surface of the support frame 1. The two output shafts of the double-axis motor 61 are coaxially fixedly connected to the extension rod 62. The other end of the extension rod 62 is fixedly connected to the turntable 63. The two turntables 63 are eccentrically fixedly connected to the side away from each other with a positioning rod 64. The lower surface of the oil bath box 2 is symmetrically fixedly connected to two sleeve frames 65. The positioning rod 64 is slidably set in the corresponding sleeve frame 65. The double-axis motor 61 is a servo motor. Its output shaft can realize clockwise and counterclockwise rotation back and forth conversion. After the double-axis motor 61 is started, its output shaft drives the two extension rods 62 to rotate synchronously. The rotation direction of the output shaft of the double-axis motor 61 and the extension rod 62 is converted back and forth between clockwise and counterclockwise. When the extension rod 62 drives the turntable 63 and the positioning rod 64 to rotate, the positioning rod 64 and the sleeve frame 65 are rotated. The wall sliding contacts and pushes the sleeve frame 65 to move. When the output shaft of the dual-axis motor 61 drives the turntable 63 and the positioning rod 64 to rotate clockwise, the positioning rod 64 drives the sleeve frame 65 and the oil bath box 2 to rotate to one side. When the output shaft of the dual-axis motor 61 drives the turntable 63 and the positioning rod 64 to rotate counterclockwise, the positioning rod 64 drives the sleeve frame 65 and the oil bath box 2 to rotate to the other side, thereby causing the moving sleeve frame 65 to drive the oil bath box 2 and the conveying cover 3 to swing. At this time, the upper end of the feed pipe 31 is connected to a hose, and the coal powder is fed into the conveying cavity through the hose to prevent the conveying cover 3 from swinging and affecting normal feeding. When the oil bath box 2 swings to a tilted state, the coal powder on the upper surface of the oil bath box 2 slides to the lower side, thereby expanding the flattening area of ​​the coal powder on the upper surface of the oil bath box 2, increasing the contact area between the coal powder and the upper box plate of the oil bath box 2, and improving the drying efficiency of the upper box plate for the coal powder.

[0033] In order to further expand the flattening area of ​​pulverized coal on the upper surface of the oil bath box 2, refer to Figure 6 A number of stirring rods 52 are fixedly connected to the side wall of the main shaft 5 in a horizontal array. The stirring rods 52 are set between two adjacent blades of the auger blade 51. When the main shaft 5 drives the auger blade 51 to rotate, the several stirring rods 52 rotate synchronously. The stirring rods 52 will break up the higher accumulated coal powder during the rotation process, so as to expand the flattening area of ​​the coal powder. When the oil bath box 2 swings to a tilted state, the coal powder on the upper surface of the oil bath box 2 slides to the lower side, and the coal powder makes a high-frequency relative movement relative to the rotating stirring rods 52. After the stirring rods 52 contact the coal powder, they stir the coal powder and stir the coal powder located above to the bottom, so that the coal powder being transported can more fully contact the upper box plate of the oil bath box 2, thereby improving the drying efficiency of the coal powder on the upper box plate of the oil bath box 2.

[0034] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A dehumidifying coal conveying device for thermal power generation, comprising a support frame (1), characterized in that: The support frame (1) is internally connected to a conveying cover (3), the bottom of the conveying cover (3) is fixedly connected to an oil bath box (2), the interior of the oil bath box (2) is filled with oil, the upper surface of the oil bath box (2) and the lower side of the conveying cover (3) are set as a conveying cavity, one side of the conveying cover (3) is fixedly connected to a conveying motor (4), the output shaft of the conveying motor (4) extends to the interior of the conveying cavity and is coaxially fixedly connected to a main shaft (5), the side wall of the main shaft (5) is fixedly connected to an auger blade (51), both ends of the main shaft (5) are rotatably arranged with the inner wall of the conveying cover (3), a hot oil circulation mechanism (7) is provided on the oil bath box (2), the hot oil circulation mechanism (7) heats the oil inside the oil bath box (2) and circulates the oil inside the oil bath box (2), and a swing mechanism (6) is provided on the support frame (1), the swing mechanism (6) is used to drive the oil bath box (2) to swing.

2. The dehumidification coal conveying device for thermal power generation according to claim 1, characterized in that: The swing mechanism (6) includes a dual-axis motor (61) fixedly connected to the upper surface of the support frame (1), the two output shafts of the dual-axis motor (61) are coaxially fixedly connected to an extension rod (62), the other end of the extension rod (62) is fixedly connected to a turntable (63), and the two turntables (63) are eccentrically fixedly connected to the sides away from each other with positioning rods (64), and the lower surface of the oil bath box (2) is symmetrically fixedly connected to two sleeve frames (65), and the positioning rods (64) are slidably set in the corresponding sleeve frames (65).

3. The dehumidification coal conveying device for thermal power generation according to claim 1, characterized in that: The hot oil circulation mechanism (7) includes a circulation pump (71) fixedly connected to one side of the oil bath tank (2), an oil extraction pipe and an oil discharge pipe are fixedly connected to both sides of the circulation pump (71), the other ends of the oil extraction pipe and the oil discharge pipe respectively pass through the opposite side walls of the oil bath tank (2), and the oil extraction pipe and the oil discharge pipe are fixed to the oil bath tank (2), and an electric heater (72) is fixedly connected to one side of the oil bath tank (2), and one end of the electric heater (72) extends to the interior of the oil bath tank (2).

4. The dehumidification coal conveying device for thermal power generation according to claim 1, characterized in that: A filling pipe (73) is fixedly connected to a position near the top of one side of the oil bath box (2), and a pressure relief valve is fixedly connected to the upper end of the filling pipe (73). A plurality of air outlet slots (33) are arranged in a horizontal array on the top of the conveying cover (3).

5. The dehumidification coal conveying device for thermal power generation according to claim 1, characterized in that: A feed pipe (31) is fixedly connected to a position near one side of the top of the conveying cover (3), and a discharge pipe (32) is fixedly connected to a position near the bottom of the other side of the conveying cover (3). The upper surface of the oil bath box (2) is configured as a concave arc surface, and the auger blade (51) contacts the upper surface of the oil bath box (2).

6. The dehumidification coal conveying device for thermal power generation according to claim 1, characterized in that: A plurality of stirring rods (52) are fixedly connected in a transverse array to the side wall of the main shaft (5), and the stirring rods (52) are arranged between two adjacent blades of the auger blade (51).

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