Pyrolysis rotary kiln feed screw

Abstract

The utility model discloses a pyrolysis rotary kiln feeding screw, which comprises a shell, a rotating shaft, a feeding drive and a spiral blade, the inner rotating shaft is rotatably arranged in the cavity, the inner spiral blade is movably contacted with the inner wall of the cavity at the outer wall of the inner rotating shaft, and the outer end of the inner rotating shaft is fixedly connected with the inside of the rotary kiln through a connecting rod. Advantage: the inner rotating shaft and the inner spiral blade are added in the cavity, the inner rotating shaft and the inner spiral blade can be driven to rotate through the rotary kiln, the dust in the cavity is pushed to the through hole, and finally discharged from the through hole into the shell, so that the problem of the air guide cavity blockage is solved, and the air guide effect is ensured. The middle part of the rotating shaft of the feeding screw is set as a non-spiral part, the material seal can be formed at the part during the conveying of the pulverized coal, the drying gas is avoided from directly entering the shell through the discharge port and then discharged from the exhaust port, so that the gas-solid large-area contact heat exchange can be avoided, and the heat loss is reduced.

Description

Technical Field

[0001] This utility model relates to the field of pyrolysis rotary kiln technology, and in particular to a pyrolysis rotary kiln feed screw. Background Technology

[0002] Rotary kilns are commonly used equipment for coal pyrolysis. After coal is fed into the rotary kiln by the feed screw, it first undergoes a drying stage (the temperature is usually below 200℃). At this time, the free water and some bound water in the coal evaporate, forming low-temperature dry gas mainly composed of water vapor. Since rotary kilns usually adopt counter-current operation (the gas flow direction is opposite to the material movement direction), the dry gas will naturally flow towards the kiln head (feed end) where the temperature is lower. To ensure timely discharge of drying gas and normal material flow, a cavity communicating with the interior of the rotary kiln is typically provided on the shaft of the feed screw. A through hole communicating with the cavity is provided on the shaft below the feed inlet of the feed screw. The drying gas generated during coal pyrolysis first enters the interior of the shaft, then exits through the through hole into the interior of the feed screw, and finally exits the system through the feed inlet. However, in the above process, the pyrolysis gas comes into large-area contact with the raw coal inside the feed screw, forming water accumulation. The raw coal can also easily enter the cavity of the shaft and directly contact the drying gas inside, causing the cavity to become blocked. This results in poor gas guiding effect, ineffective discharge of drying gas, and increased heat loss during pyrolysis. Utility Model Content

[0003] The purpose of this invention is to provide a feed screw for a pyrolysis rotary kiln to solve the problems existing in the prior art.

[0004] This utility model is implemented by the following technical solution: a pyrolysis rotary kiln feed screw, comprising a shell, a rotating shaft, a feeding drive, and helical blades. The rotating shaft is rotatably disposed inside the shell. The feeding drive is fixed at one end of the shell, and the output shaft of the feeding drive is drivingly connected to the end of the adjacent rotating shaft. The other end of the shell is a discharge port, and the discharge port is rotatably connected to the feed port of the rotary kiln. Helical blades are fixed on the outer wall of the rotating shaft inside the shell. The other end of the rotating shaft extends into the interior of the rotary kiln, and the interior of the rotating shaft is provided with... The other end of the rotating shaft is connected to a cavity; several through holes communicating with the cavity are provided on the outer wall of the rotating shaft inside the housing away from the discharge port; an exhaust port is connected to the top of the housing above the several through holes; an inlet port is connected to the top of the housing adjacent to the exhaust port; an internal rotating shaft is rotatably arranged inside the cavity; an internal spiral blade with its outer edge in movable contact with the inner wall of the cavity is fixed on the outer wall of the internal rotating shaft; the outer end of the internal rotating shaft extends to the outside of the cavity, and the outer end of the internal rotating shaft is fixedly connected to the inside of the rotary kiln through a connecting rod.

[0005] Furthermore, the spiral blade includes a first spiral blade and a second spiral blade, the middle part of the rotating shaft is a non-spiral part, the first spiral blade and the second spiral blade are respectively fixed on the outer wall of the rotating shaft on both sides of the non-spiral part, and the second spiral blade is arranged adjacent to the discharge port; the feed port is located above the first spiral blade.

[0006] The advantages of this invention are as follows: An internal rotating shaft and internal spiral blades are added inside the cavity. The rotary kiln drives the internal rotating shaft and internal spiral blades to rotate, thereby pushing the dust accumulated in the cavity to the through-hole, and finally discharging it into the shell through the through-hole. This solves the problem of blockage in the air-guiding cavity, ensures effective air guidance, allows the dry gas to be discharged in a timely manner, and reduces heat loss. Furthermore, the middle part of the feed screw shaft is designed as a spiral-free section. During the conveying of pulverized coal, a material seal can be formed at this part, preventing the dry gas from directly entering the shell through the outlet and then discharging through the exhaust port. This avoids large-area gas-solid contact heat exchange and reduces heat loss. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0008] Figure 2 This is a schematic diagram of the internal structure of the rotating shaft.

[0009] In the picture:

[0010] 1. Housing; 2. Rotary shaft; 21. Cavity; 22. Through hole; 23. Non-spiral part; 3. Feed drive; 4. Discharge port; 5. Rotary kiln; 6. Exhaust port; 7. Feed port; 8. Internal rotating shaft; 9. Internal spiral blade; 10. Connecting rod; 11. First spiral blade; 12. Second spiral blade. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0012] like Figure 1 and Figure 2As shown, a pyrolysis rotary kiln feed screw includes a shell 1, a rotating shaft 2, a feeding drive 3, and spiral blades. The rotating shaft 2 is rotatably disposed inside the shell 1. The feeding drive 3 is fixed at one end of the shell 1, and its output shaft is connected to the end of the adjacent rotating shaft 2. The other end of the shell 1 is a discharge port 4, which is rotatably connected to the feed port of the rotary kiln 5. Spiral blades are fixed on the outer wall of the rotating shaft 2 inside the shell 1. The spiral blades include a first spiral blade 11 and a second spiral blade 12. The middle part of the rotating shaft 2 is a non-spiral part 23. The first spiral blade 11 and the second spiral blade 12 are fixed on the outer walls of the rotating shaft 2 on both sides of the non-spiral part 23, and the second spiral blade 12 is arranged adjacent to the discharge port 4. The feed port 7 is located above the first spiral blade 11. The through-hole 22 and the non-spiral section 23 are located on both sides of the feed inlet 7. After the coal powder enters the left shell 1 through the feed inlet 7, it is pushed to the non-spiral section 23 by the first spiral blade 11 until the non-spiral section 23 is filled with coal powder. As coal powder is continuously added, the coal powder in the non-spiral section 23 is pushed to the right shell 1 and pushed to the right by the second spiral blade 12, and finally enters the rotary kiln through the discharge port 4. In the above process, the coal powder in the non-spiral section 23 can form a material seal, which prevents the dry gas from directly entering the shell 1 through the discharge port 4 and then being discharged through the exhaust port 6. This can avoid large-area gas-solid contact heat exchange and reduce heat loss.

[0013] The other end of the rotating shaft 2 extends into the interior of the rotary kiln 5, and the interior of the rotating shaft 2 is provided with a cavity 21 that communicates with the other end of the rotating shaft 2; a number of through holes 22 communicating with the cavity 21 are provided on the outer wall of the rotating shaft 2 inside the shell 1 away from the discharge port 4; an exhaust port 6 is connected to the top of the shell 1 above the number of through holes 22; a feed port 7 is connected to the top of the shell 1 adjacent to the exhaust port 6; an internal rotating shaft 8 is rotatably arranged inside the cavity 21; an internal spiral blade 9 with its outer edge in movable contact with the inner wall of the cavity 21 is fixed on the outer wall of the internal rotating shaft 8; the outer end of the internal rotating shaft 8 extends to the outside of the cavity 21, and the outer end of the internal rotating shaft 8 is fixedly connected to the interior of the rotary kiln 5 through a connecting rod 10.

[0014] After entering the cavity 21 through the other end of the rotating shaft 2, the drying gas is discharged into the shell 1 through the through hole 22, and then discharged from the system through the adjacent exhaust port 6. During this process, the rotary kiln 5 rotates at the same time, which drives the built-in rotating shaft 8 to rotate together through the connecting rod 10, thereby driving the built-in spiral blade 9 to rotate in the opposite direction to the first and second spiral blades. The rotating built-in spiral blade 9 can push the dust in the cavity 21 to the through hole 22, and finally discharge it into the shell 1 through the through hole 22, thereby solving the problem of blockage in the air guiding cavity 21, ensuring the air guiding effect, allowing the drying gas to be discharged in time, and reducing heat loss.

[0015] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

Claims

1. A pyrolysis rotary kiln feed screw, comprising a shell, a rotating shaft, a feed drive, a screw blade, the rotating shaft is arranged in the interior of the shell, the feed drive is fixed at one end of the shell, the output shaft of the feed drive is in transmission connection with the end of the adjacent rotating shaft, the other end of the shell is a discharge port, the discharge port is in rotary connection with the feed port of the rotary kiln, and the screw blade is fixed on the outer wall of the rotating shaft in the interior of the shell; characterized in that, The other end of the rotating shaft extends into the interior of the rotary kiln, and the interior of the rotating shaft is provided with a cavity communicating with the other end of the rotating shaft; a plurality of through holes communicating with the cavity are provided on the outer wall of the rotating shaft inside the shell away from the discharge port; an exhaust port is connected to the top of the shell above the plurality of through holes; an inlet port is connected to the top of the shell adjacent to the exhaust port; an internal rotating shaft is rotatably disposed within the cavity; an internal spiral blade with its outer edge in movable contact with the inner wall of the cavity is fixed on the outer wall of the internal rotating shaft; the outer end of the internal rotating shaft extends to the outside of the cavity, and the outer end of the internal rotating shaft is fixedly connected to the interior of the rotary kiln via a connecting rod.

2. A pyrolysis rotary kiln feed screw according to claim 1, characterised in that, The spiral blades include a first spiral blade and a second spiral blade. The middle part of the rotating shaft is a non-spiral part. The first spiral blade and the second spiral blade are fixed on the outer wall of the rotating shaft on both sides of the non-spiral part, and the second spiral blade is arranged adjacent to the discharge port. The feed port is located above the first spiral blade.

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