Hot-dry coal hopper

Abstract

The application discloses a hot drying coal hopper, which comprises a coal hopper, an inner cavity and an outer shell, a cavity communicated with an air preheater is formed between the inner cavity and the outer shell, and a maintenance passage with a sealing door is arranged in the cavity; a transmission shaft is rotatably arranged in the inner cavity, a coal scraping mechanism and a coal feeding assembly are arranged on the transmission shaft; in use, the air preheater provides hot air into the cavity, so that accumulated coal in the inner cavity is heated and water vapor adhered to the coal is discharged; the coal scraping mechanism is used for scraping coal blocks adhered to the inner side wall of the inner cavity and simultaneously stirring the accumulated coal in the inner cavity, so that the coal is quickly removed from a discharge port of the inner cavity under the driving of the coal feeding assembly. The coal hopper with the cavity, the coal scraping mechanism and the coal feeding assembly can not only heat and dry coal, but also scrape the coal blocks adhered to the inner cavity and simultaneously stir the accumulated coal in the inner cavity, and the coal is quickly removed under the driving of the coal feeding assembly; the maintenance passage is convenient for maintenance, and the structure is simple, practical and convenient to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation boilers, in particular to a thermal drying coal hopper. Background Art

[0002] Due to the high humidity of peat, it is easy to clump during transportation, making it difficult for the moisture in the peat to be discharged, resulting in non-vertical surfaces in the coal conveying system, especially in the coal hopper. It is easy for peat to accumulate and cause blockage of the coal conveying system feed. The high moisture content in the coal will affect the heating efficiency of the boiler, causing the boiler's power generation load to drop instantly, seriously affecting the allocation of the power load of the power transmission and distribution system; in addition, the coal hopper is usually inspected and maintained by entering from the open end of the coal hopper. Due to the large volume of the coal hopper, the depth is also deep. The staff need to use more auxiliary equipment to enter the coal hopper for inspection, which is costly. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a thermal drying coal hopper which can thermally dry coal, scrape and loosen coal, facilitate coal delivery, and is easy to maintain.

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is as follows: a hot drying coal hopper is provided, comprising a coal hopper, the coal hopper comprising an inner cavity and an outer shell covering the outer side of the inner cavity, a cavity connected to the air preheater is formed between the outer shell and the inner cavity, an inspection passage connected to the inner cavity is provided in the cavity, an air inlet pipe connected to the cavity is provided on one side of the outer shell, an air outlet pipe connected to the cavity is provided on the other side, an air inlet end of the air inlet pipe is connected to one side, and a hot gas pipe connected to the air preheater is provided on the other side, a mixing device is provided in the air inlet pipe corresponding to the air inlet confluence of the air pipe and the hot gas pipe The cross-section of the mixing hood is a "U"-shaped structure, and the opening direction of the mixing hood is the same as the air intake direction of the air intake pipe. An opening is provided at the position corresponding to the maintenance channel on the outer shell, and a sealing door is provided at the opening position; a transmission shaft is rotatably arranged in the inner cavity, and a coal scraping mechanism and a coal feeding assembly are arranged on the transmission shaft; when in use, the air preheater provides hot air to the cavity, so that the accumulated coal in the inner cavity is heated and the attached water vapor is discharged, and the coal scraping mechanism is used to scrape off the coal blocks attached to the inner wall of the inner cavity and at the same time loosen the accumulated coal in the inner cavity so that it can be quickly moved out from the discharge port of the inner cavity under the drive of the coal feeding assembly.

[0005] The air preheater provides heated air to the cavity between the outer shell and the inner cavity, which heats the inner cavity wall to heat the coal and evaporate the water in the coal, thus drying the coal; the maintenance channel allows workers to enter the inner cavity for inspection, and the workers can also move to the middle of the inner cavity to perform maintenance; the synchronous belt is driven by the transmission shaft to rotate the coal scraping mechanism and the coal feeding assembly, the coal scraping mechanism scrapes the coal on the inner wall of the coal hopper and loosens the accumulated coal in the coal hopper, thus reducing the resistance of the coal feeding assembly and allowing the coal to be quickly removed from the discharge port of the coal hopper.

[0006] To increase the heat absorption area and improve the heating efficiency, as a preferred embodiment, heat absorption fins are spirally arranged on the outer side wall of the inner cavity along the axial direction of the inner cavity, the extending ends of the heat absorption fins abut against the inner side wall of the outer shell, and the heat absorption fins, the inner cavity, and the outer shell form a spirally arranged cavity.

[0007] To facilitate installation and reduce interference with coal feeding, as a preferred embodiment, a bracket is arranged on the inner side wall at the position of the discharge port of the coal hopper, a power motor is arranged on the bracket, and the output end of the power motor extends vertically upward and is connected with the transmission shaft.

[0008] To simplify the structure and facilitate use, as a preferred embodiment, the coal feeding assembly includes at least two auger blades spirally arranged on the outer side wall of the transmission shaft along the axial direction of the transmission shaft, and the blade width of each auger blade is in a structure of being wide at the top and narrow at the bottom.

[0009] To improve the strength of the scraper and simplify the installation structure, as a preferred embodiment, the coal scraping mechanism includes a base sleeved on the transmission shaft, a support rod connected with the base, and a scraper obliquely connected with the support rod, and a connecting rod set is arranged between the scraper and the transmission shaft.

[0010] To facilitate the operation of loosening the accumulated coal at multiple positions, as a preferred embodiment, the connecting rod set includes three connecting rods arranged in parallel at equal distances from top to bottom, and the distance between the two connecting ends of each connecting rod decreases along the axial direction of the obliquely arranged scraper.

[0011] To improve the strength of the connecting rod and reduce the resistance caused by the normal stress, as a preferred embodiment, each connecting rod is arranged in a curved manner, and the distance between the two connecting ends of each connecting rod is the diameter of the curve.

[0012] To better reduce the resistance of the scraper, as a preferred embodiment, a transition slope is arranged on one side of the high end of the scraper corresponding to the inner side wall of the coal hopper.

[0013] In order to facilitate the coal accumulation to have space for stirring and orderly export, and ensure the smooth stirring operation, as preferred, the edges on the left and right sides along the axial direction of the support rod and the scraper are respectively provided with a first baffle and a second baffle, and the baffles on the two sides and the outer side wall of the support rod and the scraper form a connected "L"-shaped groove.

[0014] In order to better scrape the accumulated coal on the inner wall of the coal bucket, as preferred, the side of the second baffle abutting against the inner wall of the coal bucket is provided with an outer low and inner high blade bevel, and the other side is provided with a give-way bevel flush with the plane where the transition bevel outer side wall is located.

[0015] Beneficial effects: The coal bucket with cavity, coal scraping mechanism and coal conveying assembly can not only heat and dry coal, but also scrape the attached coal blocks in the coal bucket and simultaneously stir the accumulated coal in the coal bucket, and quickly move out the coal under the driving of the coal conveying assembly. The maintenance passage is convenient for maintenance, the structure is simple and practical, and the operation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a structural schematic view of the present application.

[0018] Figure 2 It is a structural schematic view of the present application. Figure 1 It is a top view.

[0019] Figure 3 It is a schematic view of the flow of gas at the position of the mixing cover.

[0020] Figure 4 It is a structural schematic view of the coal scraping device and the coal conveying assembly.

[0021] Figure 5 It is an enlarged view of A in Figure 4 It is an enlarged view of A in

[0022] The meanings of the reference numerals in the drawings are as follows:

[0023] Inner cavity-10; heat absorbing sheet-101; support-102; power motor-103; maintenance passage-104; sealing door-105; outer shell-11; auger blade-12; transmission shaft-13;

[0024] Air inlet pipe-20; air pipe-201; hot gas pipe-202; temperature instrument-203; air outlet pipe-21;

[0025] Base 3; support rod 30; scraper 31; connecting rod 32; transition slope 311; first baffle 33; second baffle 34; cutting edge slope 341; and yield slope 342. DETAILED DESCRIPTION

[0026] Depend on Figures 1 to 5 As shown, the present invention includes a coal hopper, which includes an inner cavity 10 and an outer shell 11 covering the outside of the inner cavity 10, a cavity 1 connected to the air preheater is formed between the outer shell 11 and the inner cavity 10, and an inspection channel 104 connected to the inner cavity 10 is provided in the cavity 1, and an opening is provided at a position corresponding to the inspection channel 104 on the outer shell 11, and a sealing door 105 is provided at the opening position; a transmission shaft 13 is rotatably arranged in the inner cavity 10, and a coal scraping mechanism and a coal delivery assembly are arranged on the transmission shaft 13; when in use, the air preheater provides hot air to the cavity 1, so that the accumulated coal in the inner cavity 10 is heated and the attached moisture is discharged, and the coal scraping mechanism is used to scrape off the coal blocks attached to the inner wall of the inner cavity 10 and at the same time loosen the accumulated coal in the inner cavity 10 so that it can be quickly moved out from the discharge port of the inner cavity 10 under the drive of the coal delivery assembly.

[0027] Specifically, a heat absorbing sheet 101 extending outward is spirally provided on the outer wall of the inner cavity 10 along the axial direction of the inner cavity 10, and the extending ends of the heat absorbing sheet 101 are in contact with the inner wall of the outer shell 11. The heat absorbing sheet 101, the inner cavity 10 and the outer shell 11 together form a spirally arranged cavity 1.

[0028] An air inlet pipe 20 communicating with the cavity 1 is provided on one side of the outer shell 1, and an air outlet pipe 21 communicating with the cavity 1 is provided on the other side. An air pipe 201 is provided on one side of the air inlet end of the air inlet pipe 20, and a hot air pipe 202 communicating with the air preheater is provided on the other side. A mixing hood 22 is provided at the air inlet junction of the air pipe 201 and the hot air pipe 202 in the air inlet pipe 20. The cross-section of the mixing hood 22 is a "U"-shaped structure, and the opening direction of the mixing hood 22 is the same as the air inlet direction of the air inlet pipe 20.

[0029] A bracket 102 is provided on the inner side wall of the inner cavity 10 at the discharge port position, and a power motor 103 is provided on the bracket 102 . The output end of the power motor 103 extends vertically upward and is connected to the transmission shaft 13 .

[0030] The coal delivery assembly includes at least two auger blades 12 that are spirally arranged on the outer side wall of the transmission shaft 13 along the axial direction of the transmission shaft 13. The width of each auger blade 12 is a structure that is wide at the top and narrow at the bottom.

[0031] The coal scraping mechanism comprises a base 3 sleeved on the transmission shaft 13, a supporting rod 30 connected with the base 3, and a scraper 31 connected with the supporting rod 30 at an angle, a connecting rod set is arranged between the scraper 31 and the transmission shaft 13, the connecting rod set comprises three connecting rods 32 arranged in parallel at equal distances from top to bottom, and the distance between two connecting ends of each connecting rod 32 decreases at equal distances along the axial direction of the scraper 31 arranged at an angle.

[0032] Each connecting rod 32 is arranged in a curve, and the distance between the two connecting ends of each connecting rod 32 is the diameter of the curve.

[0033] The supporting rod 30 and the scraper 31 are in an integrated structure, and a transition inclined surface 311 is arranged on the high end of the scraper 31 corresponding to one side of the inner side wall of the coal hopper.

[0034] First and second baffle plates 33 and 34 are arranged on the left and right sides along the axial direction of the supporting rod 30 and the scraper 31, respectively, the baffle plates on both sides and the outer side walls of the supporting rod 30 and the scraper 31 form a continuous L-shaped groove, the second baffle plate 34 is provided with a blade inclined surface 341 with an outer low and inner high on one side abutting against the inner wall of the coal hopper, and a giving-in inclined surface 342 flush with the plane of the outer side wall of the transition inclined surface 311 on the other side.

[0035] The use principle of the present application is as follows:

[0036] As shown in Figures 1 to 3 , in use, hot gas is discharged from the air preheater (not marked) and enters the air inlet pipe 20 through the hot gas pipe 202, at the same time, in combination with the temperature requirement, normal temperature gas is also drawn from the air pipe 201 to adjust the gas temperature in the air inlet pipe 20, in order to improve the cooling efficiency of the mixed gas, a mixing cover 22 is arranged at the air inlet convergence position of the air pipe 201 and the hot gas pipe 202, as shown in Figure 3 , the use principle is that the hot air and normal temperature air entering from both ends first mix a little, and more is the rebound between the gases, and each rebounds to the position of the corresponding air inlet end, under the action of the gas pressure of the corresponding end, continues to flow along the pipe wall of the corresponding end of the air inlet pipe 20 and the outer side wall of the mixing cover 22, when the hot gas and normal temperature air flow to the opening position of the mixing cover 22, the gases at both ends will flow back to the structure of the mixing cover 22 with a “U” shaped cross section, and fully mixed to achieve the purpose of rapid cooling, in order to accurately understand the temperature of the mixed gas, a temperature instrument 203 is arranged on the air inlet pipe 20 corresponding to the position of the mixing cover 22; the fully mixed gas continues to flow into the cavity 1 through the air inlet pipe 20 under the action of the gas pressure, and the heat transfer of the air is used to transfer the temperature to the inner cavity 10 through the heat transfer sheet 101, so as to achieve the purpose of heating the peat in the inner cavity 10, and the water vapor in the peat is volatilized by heating, so as to achieve the purpose of drying the coal.

[0037] As Figure 1 , Figure 2 , Figure 4 and Figure 5 shown, when the peat into the coal bunker after a large amount, due to the lower structure of the coal bunker contains non-vertical surface and peat containing moisture, easy to exist in the non-vertical surface accumulation phenomenon, at this time, start the power motor 103, synchronous belt drive shaft 13 and the base 3 set with the rotation, that is, the scraper 31 with the base 3 rotation is also synchronous rotation, because the scraper 31 in the direction of rotation is provided with blade bevel 341, facilitate fast coal, at the same time, the setting of the displacement bevel 342 also reduces the contact area of the scraper 31 and the coal bunker inner wall, reduces the resistance of the coal, and, also with the transition bevel 311 outside wall of the plane flush, the scraper 31 in the coal material moves, reduces the stress of the front.

[0038] Among them, it should be noted that, between the transmission shaft 13 and the scraper 31 is also connected with three connecting rods 32, the distance between the two connecting ends of each connecting rod 32 is equidistantly reduced along the axial direction of the inclined scraper 31, and each connecting rod 32 is curved and the distance between the two connecting ends is the diameter of the curvature. The three connecting rods 32 with equal intervals are arranged from top to bottom to form a tapered structure with a wide upper part and a narrow lower part. During synchronous rotation with the transmission shaft 13, each connecting rod 32 moves in the coal material, generates a gap after moving, and is beneficial to change the state of accumulated coal, similar to the effect of loosening the soil, to achieve the purpose of loosening the accumulated coal. The first baffle 33, the second baffle 34, and the outer side wall of the scraper 31 form a continuous "L" shaped groove, which is beneficial to orderly guide the loosened coal material and make the internal accumulation of coal more orderly, facilitating the delivery of coal.

[0039] At the same time, the rotation of the transmission shaft 13 also synchronously drives the rotation of the three auger blades 12, and the rotation direction of the auger blades 12 is towards the discharge port at the lower end of the coal bunker. The blade width of the auger blade 12 is a structure with a wide upper part and a narrow lower part, which facilitates coal delivery while reducing resistance in the coal delivery direction. At the same time, the support 102 also adopts a cross-shaped structure to maximize the discharge capacity of the discharge port of the coal bunker.

[0040] Finally, as shown in Figure 1 and Figure 2 , in order to facilitate maintenance, a maintenance hole is provided on the inner wall of the cavity 10 corresponding to the upper position of the scraper 31. A maintenance channel 104 is provided in the spiral cavity 1 between the outer shell 11 and the inner cavity 10, which is in communication with the maintenance hole. The maintenance channel 104 is provided with an opening on the outer shell 11, and a sealing door 105 is provided at the opening position. Figure 1As shown, in use, the sealing door 105 is opened, the worker comes to the access hole position from the access channel 104, and climbs down along the three connecting rods 32 to the inner cavity 10, facilitating the worker to temporarily overhaul the related components such as the scraper 31 or the auger blade 12; meanwhile, the access channel 104 is arranged at a position between two adjacent cavity sections, so as to ensure the smooth flow of hot air in the spiral cavity 1.

Claims

1. A thermal drying coal hopper, comprising a coal hopper, characterized in that: The coal hopper comprises an inner cavity (10) and an outer shell (11) covering the outer side of the inner cavity (10), a cavity (1) communicating with the air preheater is formed between the outer shell (11) and the inner cavity (10), an inspection passage (104) communicating with the inner cavity (10) is provided in the cavity (1), an air inlet pipe (20) communicating with the cavity (1) is provided on one side of the outer shell (11), and an air outlet pipe (21) communicating with the cavity (1) is provided on the other side, an air inlet end of the air inlet pipe (20) is provided on one side, and a hot air pipe (202) communicating with the air preheater is provided on the other side, a mixing hood (22) is provided in the air inlet pipe (20) at the air inlet junction corresponding to the air pipe (201) and the hot air pipe (202), and the mixing hood (22) is provided in the air inlet pipe (20), and the mixing hood (22) is provided in the air inlet pipe (20). The cross section of the mixing cover (22) is a "U"-shaped structure. The opening direction of the mixing cover (22) is the same as the air intake direction of the air intake pipe (20). An opening is provided at a position corresponding to the inspection channel (104) on the outer shell (11), and a sealing door (105) is provided at the opening position. A transmission shaft (13) is rotatably provided in the inner cavity (10), as well as a coal scraping mechanism and a coal delivery assembly provided on the transmission shaft (13). When in use, the air preheater provides hot air to the cavity (1), so that the coal accumulated in the inner cavity (10) is heated and the attached moisture is discharged. The coal scraping mechanism is used to scrape off the coal blocks attached to the inner wall of the inner cavity (10) and simultaneously loosen the coal accumulated in the inner cavity (10) so that the coal can be quickly removed from the discharge port of the inner cavity (10) under the drive of the coal delivery assembly.

2. The hot drying coal hopper according to claim 1, characterized in that: A heat absorbing sheet (101) extending outward is provided on the outer wall of the inner cavity (10) along the axial spiral of the inner cavity (10), and the extending ends of the heat absorbing sheet (101) are in contact with the inner wall of the outer shell (11). The heat absorbing sheet (101), the inner cavity (10) and the outer shell (11) together form a spirally arranged cavity (1).

3. The hot drying coal hopper according to claim 1, characterized in that: A bracket (102) is provided on the inner side wall of the inner cavity (10) at the discharge port position, and a power motor (103) is provided on the bracket (102). The output end of the power motor (103) extends vertically upward and is connected to the transmission shaft (13).

4. The hot drying coal hopper according to claim 1, characterized in that: The coal delivery assembly comprises at least two auger blades (12) which are spirally arranged on the outer side wall of the transmission shaft (13) along the axial direction of the transmission shaft (13), and each of the auger blades (12) has a blade width which is wider at the top and narrower at the bottom.

5. The hot drying coal hopper according to claim 1, characterized in that: The coal scraping mechanism comprises a base (3) sleeved on a transmission shaft (13), a support rod (30) connected to the base (3), and a scraper (31) obliquely connected to the support rod (30); a connecting rod group is connected between the scraper (31) and the transmission shaft (13); the connecting rod group comprises three connecting rods (32) equidistantly arranged in parallel from top to bottom, and the distance between the two connecting ends of each connecting rod (32) decreases equidistantly along the axial direction of the oblique scraper (31).

6. The hot drying coal hopper according to claim 5, characterized in that: Each connecting rod (32) is bent, and the distance between the two connecting ends of each connecting rod (32) is the diameter of the bend.

7. The hot drying coal hopper according to claim 5, characterized in that: A transition slope (311) is provided on one side of the upper end of the scraper (31) corresponding to the inner wall of the coal hopper.

8. The hot drying coal hopper according to claim 6, characterized in that: A first baffle (33) and a second baffle (34) are respectively provided on the left and right edges of the support rod (30) and the scraper (31) in the axial direction, and the baffles on both sides and the outer side walls of the support rod (30) and the scraper (31) are combined to form a connected "L"-shaped groove.

9. The hot drying coal hopper according to claim 8, characterized in that: The second baffle (34) is provided with a cutting edge inclined surface (341) with a lower outer side and a higher inner side on one side abutting against the inner wall of the coal hopper, and a yielding inclined surface (342) flush with the plane of the outer side wall of the transition inclined surface (311) on the other side.

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