Drying and pyrolysis integrated rotary kiln structure

Abstract

The utility model relates to a drying and pyrolyzing integrated rotary kiln structure, which belongs to the technical field of rotary kilns, and particularly comprises a flue gas heating pipe arranged in a rotary kiln, a feeding end and a discharging end of the rotary kiln are respectively provided with a flue gas cover and a blanking cover through a turnover kiln coating sealing mechanism, a flue gas outlet is arranged on the flue gas cover, and the blanking cover is provided with a discharge port. A gas outlet and a solid discharging port are formed in the discharging cover, a feeding mechanism is further installed at the feeding end of the rotary kiln, the feeding mechanism is fixed to the smoke cover, the feeding mechanism is installed on an end plate of the rotary kiln through a first dynamic sealing mechanism, and the rotary kiln is simple in structure, reasonable in design, reliable in sealing and capable of guaranteeing stable operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of drying pyrolysis integrated rotary kiln structure, belong to rotary kiln technical field. BACKGROUND

[0002] At present, the way of horizontal rotary kiln for low-rank coal pyrolysis becomes a trend, usually the raw coal is first dried in a drying kiln, and then pyrolyzed in another pyrolysis equipment. However, when the dried coal is pyrolyzed, the yield of coal tar will be reduced, and at the same time, it may potentially cause certain safety and environmental problems. For example, the dried low-rank coal is easy to overflow dust, causing environmental accidents, and the overflowed dust is easy to self-ignite, which can easily cause safety accidents. In addition, the raw coal directly enters the pyrolysis kiln for pyrolysis, and since the moisture content of the raw coal is too high (usually 12-20%), if it is not dried, all the moisture will enter the ammonia water separated after pyrolysis. This ammonia water is waste water, which will cause high waste water treatment cost, and at the same time, all the waste water needs to be heated to 500°C, and then cooled with coal gas, which greatly increases the energy consumption.

[0003] Chinese patent with publication number CN 117568059A discloses a pyrolysis rotary kiln feeding device and a rotary kiln feeding system. The patent not only designs a very complex spiral conveyor, but also requires the guide cylinder to be circular in shape to improve the conveying efficiency. However, the entire spiral cylinder is designed as a large cylinder, and only a part of the large circle is used for conveying materials, which greatly reduces the conveying capacity. At the same time, since the contact area between the extracted water vapor and the cold object is large, the water vapor will condense, causing an increase in heat consumption. In addition, the presence of a large amount of fine powder will cause adhesion and blockage, which may even cause production stoppage. SUMMARY

[0004] To solve the technical problems existing in the prior art, the utility model provides a drying pyrolysis integrated rotary kiln structure which is simple in structure, reasonable in design, reliable in sealing and stable in operation.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a drying pyrolysis integrated rotary kiln structure, which comprises a rotary kiln, a flue gas heating pipe arranged in the rotary kiln, a flue gas cover and a discharge cover respectively installed on the feeding end and the discharging end of the rotary kiln through a rotary kiln skin sealing mechanism, a flue gas outlet arranged on the flue gas cover, a gas outlet and a solid discharge port arranged on the discharge cover, a feeding mechanism installed on the feeding end of the rotary kiln, the feeding mechanism being fixed on the flue gas cover and installed on the end plate of the rotary kiln through a first dynamic sealing mechanism.

[0006] Preferably, the rotary kiln skin sealing mechanism comprises a first fixed cylinder arranged on the outer turning part of the rotary kiln end and mounted on the flue gas cover / charging cover, the first fixed cylinder is sleeved outside the outer turning part, the first fixed cylinder is internally mounted with a first fixed ring and a second fixed ring, the first fixed ring and the second fixed ring are mounted on the inner wall of the first fixed cylinder or the outer turning part, and the first fixed ring and the second fixed ring are filled with flexible sealing material.

[0007] Preferably, a heat dissipation interval is arranged between the outer turning part and the outer wall of the rotary kiln.

[0008] Preferably, the inner side of the first fixed ring is mounted with a first movable ring through at least two first adjusting jackscrews, the first adjusting jackscrews are mounted on the first fixed ring, and the flexible sealing material is arranged between the first movable ring and the second fixed ring.

[0009] Preferably, the feeding mechanism comprises a guide cylinder, a rotating shaft, and a spiral blade mounted on the rotating shaft, one end of the guide cylinder is provided with a feeding port, and the other end is provided with a discharging port, the center of the rotating shaft is provided with a gas guide channel, one end of the rotating shaft is provided with a gas inlet in communication with the gas guide channel, the gas inlet is rotatably connected with a steam collecting pipe, the steam collecting pipe extends into the rotary kiln, the other end of the rotating shaft extends to the outside of the guide cylinder and is connected with a feeding motor, the peripheral wall of the rotating shaft is provided with a gas outlet hole, the opening part of the rotating shaft is provided with a gas guide sealing cover, a second dynamic sealing mechanism is arranged between the gas guide sealing cover and the rotating shaft, and a steam discharge port is arranged on the gas guide sealing cover.

[0010] Preferably, the first dynamic sealing mechanism and the second dynamic sealing mechanism are the same in structure, comprising a second fixed cylinder arranged on both sides of the gas guide sealing cover / the end plate of the rotary kiln, the second fixed cylinder is internally mounted with a third fixed ring and a fourth fixed ring.

[0011] In the first dynamic sealing mechanism, the third fixed ring and the fourth fixed ring are mounted on the inner wall of the second fixed cylinder or the outer wall of the guide cylinder.

[0012] In the second dynamic sealing mechanism, the third fixed ring and the fourth fixed ring are mounted on the inner wall of the second fixed cylinder or the rotating shaft.

[0013] The third fixed ring and the fourth fixed ring are filled with flexible sealing material.

[0014] Preferably, the inner side of the third fixed ring is mounted with a second movable ring through at least two second adjusting jackscrews, the second adjusting jackscrews are mounted on the third fixed ring, and the flexible sealing material is arranged between the second movable ring and the fourth fixed ring.

[0015] Preferably, the flexible sealing material is a graphite packing, a chevron rubber seal, or a combination of a graphite packing and a chevron rubber seal.

[0016] Compared with the prior art, the utility model has following technical effects: the utility model is separated from the material conveying channel and the steam extraction channel, and because of the steam collecting pipe, the temperature of the steam can be controlled above 100 DEG C, generally, the temperature of the steam is controlled at about 120 DEG C, then the steam passes at high flow rate, the temperature reduction of the steam can be ignored, so that dry dedusting is realized, and the fine dust is recycled; the steam channel is separated from the material conveying channel, and the problem of adhesion of the material conveying channel is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view of the utility model.

[0018] Figure 2 It is a structural schematic view of the turning kiln skin sealing mechanism in the utility model.

[0019] Figure 3 It is Figure 1 It is a local enlarged view of A in the utility model.

[0020] Figure 4 It is Figure 1 It is a local enlarged view of B in the utility model. DETAILED DESCRIPTION

[0021] In order to make the technical problem, technical scheme and beneficial effect of the utility model clearer, the utility model is further described in detail below by combining with the drawings and examples.

[0022] As Figure 1 shown, a dry pyrolysis integrated rotary kiln structure, including rotary kiln 1, rotary kiln 1 is provided with flue gas heating pipe 2, the feed end and the discharge end of rotary kiln 1 are installed with flue gas cover 4 and discharge cover 5 through turning kiln skin sealing mechanism 3 respectively, flue gas cover 4 is provided with flue gas outlet 6, discharge cover 5 is provided with gas outlet 7 and solid discharge port 8, the feed end of rotary kiln 1 is also installed with feeding mechanism 9, feeding mechanism 9 is fixed on flue gas cover 4, and feeding mechanism 9 is installed on the end plate of rotary kiln 1 through first dynamic sealing mechanism 10.

[0023] In the utility model, turning kiln skin sealing mechanism 3 is installed at the connecting part of rotary kiln 1 and flue gas cover 4, discharge cover 5, effective sealing is carried out by turning kiln skin sealing mechanism 3, and the phenomenon of smoke leakage or air leakage is avoided. Feeding mechanism 9 is installed on the end plate of rotary kiln 1 through first dynamic sealing mechanism 10, and sealing is realized.

[0024] like Figure 2 As shown, the rotary kiln skin sealing mechanism 3 includes an outwardly turned part 11 disposed at the end of the rotary kiln 1 and a first fixed cylinder 12 installed on the flue gas hood 4 / feed hood 5. The first fixed cylinder 12 is sleeved on the outside of the outwardly turned part 11. A first fixed ring 13 and a second fixed ring 14 are installed inside the first fixed cylinder 12. The first fixed ring 13 and the second fixed ring 14 are installed on the inner wall of the first fixed cylinder 12 or on the outwardly turned part 11. A flexible sealing material 15 is filled between the first fixed ring 13 and the second fixed ring 14.

[0025] The rotating kiln skin sealing mechanism 3 can be used to seal the flue gas hood 4, the material discharge hood 5, and the rotary kiln 1. It mainly utilizes the outward-turning part 11 to achieve a connection and seal with the flue gas hood 4 and the material discharge hood 5. The outward-turning part 11 is made by turning the kiln skin outward or by welding an outward-turning structure, and it turns towards the center of the rotary kiln. The rotary kiln 1, the flue gas hood 4, the material discharge hood 5, and the outward-turning part 11 are all equipped with heat-insulating material. This prevents the rotary kiln body and the rotating kiln skin from deforming due to heat. The sealing surface does not have a heat-insulating layer; the sealing surface is relatively external, and heat is blocked from being transferred to the sealing surface by the flexible sealing material. A heat dissipation gap is provided between the outward-turning part 11 and the outer wall of the rotary kiln 1. This creates a large heat dissipation surface between the outward-turning part 11 and the rotary kiln 1, further maintaining a lower temperature for the rotary kiln body and the outward-turning part, preventing deformation of the outward-turning part.

[0026] To ensure reliable sealing during long-term operation, a first movable ring 17 is mounted on the inner side of the first fixed ring 13 via at least two first adjusting screws 16. The first adjusting screws 16 are installed on the first fixed ring 13, and the flexible sealing material 15 is disposed between the first movable ring and the second fixed ring 14. The first adjusting screws 16 control the movement of the first fixed ring 13 to compress the flexible sealing material 15, thereby ensuring that the flexible sealing material 15 maintains a reliable seal with the first fixed cylinder 12 and the outward-facing part 11. The flexible sealing material 15 can be graphite packing, a herringbone rubber sealing ring, or a combination of graphite packing and a herringbone rubber sealing ring.

[0027] like Figure 1As shown, the feeding mechanism 9 comprises a material guiding cylinder 18, a rotating shaft 19 and a helical blade 20 mounted on the rotating shaft 19, the material guiding cylinder 18 is provided with a feeding port 21 at one end and a discharging port 22 at the other end, the center of the rotating shaft 19 is provided with a gas guiding channel 23, one end of the rotating shaft 19 is provided with a gas inlet port 24 communicating with the gas guiding channel 23, the gas inlet port 24 is rotatably connected with a steam collecting pipe 25, the steam collecting pipe 25 extends into the rotary kiln 1 and is supported and installed in the rotary kiln 1, the other end of the rotating shaft 19 extends to the outside of the material guiding cylinder 18 and is connected with a feeding motor 26, the peripheral wall of the rotating shaft 19 is provided with a gas outlet hole 27, the opening part of the rotating shaft 19 is provided with a gas guiding sealing cover 28, the second dynamic sealing mechanism 29 is arranged between the gas guiding sealing cover 28 and the rotating shaft 19, and the gas guiding sealing cover 28 is provided with a steam discharge port 30. The feeding mechanism 9 is designed to integrate feeding and steam extraction, the rotating shaft 19 of the screw conveyor is provided with the gas guiding channel 23 in the center along the axis direction, the gas guiding channel 23 serves as the main channel for extracting steam, one end is provided with the gas inlet port, the other end is provided with the gas outlet hole 27, and the gas guiding sealing cover 28 is installed outside the gas outlet hole 27, the gas guiding sealing cover 28 is sealed and the steam is quickly extracted.

[0028] In the embodiment, the inner diameter of the rotating shaft 19 is 500 mm, the outer diameter is 560 mm, the inner diameter of the material guiding cylinder 18 is 1000 mm, the outer diameter is 1200 mm, the length of the material guiding cylinder 18 is 5 m, the length of the steam collecting pipe 25 is 12 m, the outer diameter is 480 mm, and the discharge temperature of the steam is 120℃.

[0029] As shown in the drawings, Figure 3 The first dynamic sealing mechanism 10 comprises a second fixed cylinder 31 arranged outside the material guiding cylinder 18, the second fixed cylinder 31 is fixed on the end plate of the rotary kiln 1, the second fixed cylinder 31 is provided with a third fixed ring 32 and a fourth fixed ring 33, the third fixed ring 32 and the fourth fixed ring 33 are installed on the inner wall of the second fixed cylinder 31 or the outer wall of the material guiding cylinder 18, or the third fixed ring 32 and the fourth fixed ring 33 are installed on the inner wall of the second fixed cylinder 31 and the outer wall of the material guiding cylinder 18 respectively, and the third fixed ring 32 and the fourth fixed ring 33 are filled with flexible sealing material 15. In view of the sealing reliability of the material guiding cylinder 18, the second fixed cylinder 31 is installed outside the material guiding cylinder 18, the third fixed ring 32 and the fourth fixed ring 33 are arranged in the second fixed cylinder 31, and the sealing is realized by filling the flexible sealing material 15 between the third fixed ring 32 and the fourth fixed ring 33. The flexible sealing material 15 is graphite packing, herringbone rubber sealing ring or a combination of graphite packing and herringbone rubber sealing ring.

[0030] In order to ensure that the flexible sealing material 15 keeps reliable sealing state in long time operation, the inner side of the third fixed ring 32 is provided with the second movable ring 35 through at least two second adjusting top screws 34, the second adjusting top screws 34 are installed on the third fixed ring 32, and the flexible sealing material 15 is arranged between the second movable ring 35 and the fourth fixed ring 33. The second movable ring 35 is controlled to move and extrude the flexible sealing material 15 through the second adjusting top screws 34, so as to ensure that the flexible sealing material 15 keeps reliable sealing state with the second fixed cylinder 31 and the material guide cylinder 18.

[0031] As shown in Figure 4 The second dynamic sealing mechanism 29 comprises the second fixed cylinder 31 arranged on the end plate of the rotary kiln 11, the third fixed ring 32 and the fourth fixed ring 33 are arranged in the second fixed cylinder 31, the third fixed ring 32 and the fourth fixed ring 33 are arranged on the inner wall of the second fixed cylinder 31 or the rotating shaft 19, or the third fixed ring 32 and the fourth fixed ring 33 are arranged on the inner wall of the second fixed cylinder 31 and the rotating shaft 19 respectively, and the flexible sealing material 15 is filled between the third fixed ring 32 and the fourth fixed ring 33. In view of the sealing reliability of the gas guide sealing cover 28, the second fixed cylinder 31 is arranged on both sides of the gas guide sealing cover, the third fixed ring 32 and the fourth fixed ring 33 are arranged in the second fixed cylinder 31, and the sealing is realized by filling the flexible sealing material 15 between the third fixed ring 32 and the fourth fixed ring 33. The flexible sealing material 15 is graphite packing, herringbone rubber sealing ring or a combination of graphite packing and herringbone rubber sealing ring.

[0032] In order to ensure that the flexible sealing material 15 keeps reliable sealing state in long time operation, the inner side of the third fixed ring 32 is provided with the second movable ring 35 through at least two second adjusting top screws 34, the second adjusting top screws 34 are installed on the third fixed ring 32, and the flexible sealing material 15 is arranged between the second movable ring 35 and the fourth fixed ring 33. The second movable ring 35 is controlled to move and extrude the flexible sealing material 15 through the second adjusting top screws 34, so as to ensure that the flexible sealing material 15 keeps reliable sealing state with the second fixed cylinder 31 and the material guide cylinder 18.

[0033] The above only describes the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A dry pyrolysis integrated rotary kiln structure comprising a rotary kiln, wherein a flue gas heating pipe is arranged in the rotary kiln, characterized in that: The feeding end and the discharging end of the rotary kiln are respectively provided with a flue gas cover and a discharging cover through a turnover kiln skin sealing mechanism, the flue gas cover is provided with a flue gas outlet, the discharging cover is provided with a gas outlet and a solid discharging port, and the feeding end of the rotary kiln is further provided with a feeding mechanism, which is fixed on the flue gas cover and is installed on the end plate of the rotary kiln through a first dynamic sealing mechanism.

2. The integrated dry pyrolysis rotary kiln structure of claim 1, wherein: The turnover kiln skin sealing mechanism comprises a first fixed cylinder arranged on the turnover part of the rotary kiln and installed on the flue gas cover / discharging cover, the first fixed cylinder is arranged outside the turnover part, the first fixed cylinder is internally provided with a first fixed ring and a second fixed ring, the first fixed ring and the second fixed ring are arranged on the inner wall of the first fixed cylinder or the turnover part, and the first fixed ring and the second fixed ring are filled with flexible sealing material.

3. The integrated dry pyrolysis rotary kiln structure of claim 2, wherein: A heat dissipation interval is arranged between the turnover part and the outer wall of the rotary kiln.

4. The integrated dry pyrolysis rotary kiln structure of claim 2, wherein: The inner side of the first fixed ring is provided with a first movable ring through at least two first adjusting top screws, the first adjusting top screws are arranged on the first fixed ring, and the flexible sealing material is arranged between the first movable ring and the second fixed ring.

5. The integrated dry pyrolysis rotary kiln structure according to any one of claims 2-4, characterized in that: The feeding mechanism comprises a guide cylinder, a rotating shaft and a spiral blade arranged on the rotating shaft, one end of the guide cylinder is provided with a feeding port, the other end is provided with a discharging port, the center of the rotating shaft is provided with a gas guide channel, one end of the rotating shaft is provided with a gas inlet in communication with the gas guide channel, the gas inlet is rotatably connected with a steam collecting pipe, the steam collecting pipe extends into the rotary kiln, the other end of the rotating shaft extends to the outside of the guide cylinder and is connected with a feeding motor, the peripheral wall of the rotating shaft is provided with a gas outlet hole, the opening part of the rotating shaft is provided with a gas guide sealing cover, a second dynamic sealing mechanism is arranged between the gas guide sealing cover and the rotating shaft, and the gas guide sealing cover is provided with a steam discharge port.

6. The integrated dry pyrolysis rotary kiln structure of claim 5, wherein: The first dynamic sealing mechanism and the second dynamic sealing mechanism are the same in structure and comprise a second fixed cylinder arranged on the two sides of the gas guide sealing cover / the end plate of the rotary kiln, the second fixed cylinder is internally provided with a third fixed ring and a fourth fixed ring. In the first dynamic sealing mechanism, the third fixed ring and the fourth fixed ring are arranged on the inner wall of the second fixed cylinder or the outer wall of the guide cylinder. In the second dynamic sealing mechanism, the third fixed ring and the fourth fixed ring are arranged on the inner wall of the second fixed cylinder or the rotating shaft. The third fixed ring and the fourth fixed ring are filled with flexible sealing material.

7. The integrated dry pyrolysis rotary kiln structure of claim 6, wherein: The inner side of the third fixed ring is provided with a second movable ring through at least two second adjusting top screws, the second adjusting top screws are arranged on the third fixed ring, and the flexible sealing material is arranged between the second movable ring and the fourth fixed ring.

8. The integrated dry pyrolysis rotary kiln structure of claim 6, wherein: The flexible sealing material is a graphite packing, a herringbone rubber sealing ring or a combination of the graphite packing and the herringbone rubber sealing ring.

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