Waste heat recovery device of rotary furnace

Abstract

The utility model discloses a rotary furnace waste heat recovery device which comprises a first rack and a second rack which are arranged in the horizontal direction, a common rotary furnace body is installed on the first rack and the second rack through riding wheel sets, one set of riding wheels are driven by a motor, the rotary furnace body is arranged in an inclined mode, and the other set of riding wheels are driven by a motor. A supporting frame is arranged at the position, located between the first rack and the second rack, below the rotary furnace body, the rotary furnace body is sleeved with a shell matched with the rotary furnace body, the shell is borne by the supporting frame, an air inducing barrel is installed at a port of the higher end of the rotary furnace body through a rotatable flange, and the bottom of the air inducing barrel is supported by a third rack. An air inlet of the induced draft fan is communicated with the end, away from the rotary furnace body, of the air outlet pipe, and an air outlet of the induced draft fan extends to the circumferential wall of the lower end of the shell through a hot air pipe and extends into the shell, and a detachable connecting mechanism is arranged between the induced draft barrel and the air outlet pipe. The rotary furnace waste heat recycling device can achieve rotary furnace waste heat recycling.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary furnaces, and more specifically, to a waste heat recovery device for a rotary furnace. Background Art

[0002] The rotary furnace body is a long steel cylinder lined with refractory materials. The furnace body is supported on several pairs of supporting wheels and has an inclination of 3% to 6%. The furnace body is driven by an electric motor to rotate slowly through gears. The material is added from the higher tail end and discharged from the lower furnace head end. Fuel is sprayed into the furnace head end and burned in the furnace, and the smoke is discharged from the higher end.

[0003] It has the advantages of combustion system, strong technical power, precise gas distribution, low burning loss rate, etc. It is mainly used for calcining cement clinker in cement industry, and also used for calcining granular and powdered materials in refractory and ceramic industries and drying various raw materials in the above industries. It is widely used for drying, dehydrating and roasting materials in the chemical industry. For example, the production of alumina is to calcine the mixture of aluminum ore powder and coal powder in a rotary kiln, so that the aluminum in the ore powder is reduced to aluminum vapor, and then oxidized by air. The generated alumina is captured to obtain alumina finished products. During the calcination process, the calcination temperature in the rotary kiln can reach 1400°C, and the waste heat generated is also very considerable. Therefore, how to recycle the waste heat of the rotary kiln to achieve the purpose of energy saving and consumption reduction has always been an urgent problem to be solved.

[0004] Therefore, it is necessary to propose a rotary kiln waste heat recovery device to realize the recovery and reuse of the rotary kiln waste heat. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to propose a rotary furnace waste heat recovery device, which cooperates with the induced draft fan through the exhaust pipe, and connects the induced draft fan to the hot air duct, so that the hot air transfers the waste heat to the outer wall of the rotary furnace body along the hot air duct, thereby realizing the recovery and utilization of the waste heat.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A rotary furnace waste heat recovery device comprises a monitoring device body, including a frame 1 and a frame 2 arranged in a horizontal direction, a common rotary furnace body is installed on the frame 1 and the frame 2 through a supporting wheel group, wherein a group of supporting wheels is driven by a motor, the rotary furnace body is inclined, a feeding cylinder is arranged on the outer wall of the higher end of the rotary furnace body, a support frame is arranged below the rotary furnace body and between the frame 1 and the frame 2, a shell matching the rotary furnace body is sleeved on the rotary furnace body, and the shell is supported by the support frame;

[0008] An induced draft tube is installed at the port at the higher end of the rotary furnace body through a rotatable flange, the bottom of the induced draft tube is supported by the frame three, and the outer end thereof is connected to an induced draft fan through an air outlet pipe, the air inlet of the induced draft fan is connected to the end of the air outlet pipe away from the rotary furnace body, and the air outlet thereof extends to the circumferential wall of the lower end of the shell through the hot air pipe and extends to the inside thereof;

[0009] A detachable connecting mechanism is arranged between the air induced cylinder and the air outlet pipe.

[0010] The utility model is further configured as follows: the connection mechanism includes an annular groove provided on the inner wall of the outer end of the induced draft tube, a filter screen matching the annular groove is longitudinally placed at the bottom of the annular groove, a docking tube is connected to the end of the outlet pipe away from the induced draft fan, a sealing ring is provided on the inner ring wall of the annular groove, the end of the docking tube away from the outlet tube is inserted into the annular groove, and the outer end wall of the docking tube abuts against the filter screen, and its outer circumferential wall abuts against the inner ring wall of the sealing ring, and a locking assembly is provided between the docking tube and the induced draft tube;

[0011] The air outlet pipe is a high temperature resistant hose.

[0012] The utility model is further configured as follows: the locking assembly includes a mounting groove provided on the outer wall of the induced draft tube, a retaining ring is provided at the opening of the mounting groove, a through hole is provided at the bottom thereof, the through hole extends to the outside of the inner wall of the sealing ring, a pull rod is passed through the mounting groove, the inner end of the pull rod passes through the through hole and is provided with a limiting tooth, the outer end of the pull rod passes through the retaining ring and is provided with a pull plate, the limiting tooth is arranged obliquely to the filter screen, a limiting tooth groove matching the limiting tooth is provided on the outer wall of the docking sleeve, and a limiting plate is installed on the pull rod located in the mounting groove, a spring is sleeved on the pull rod and between the limiting plate and the retaining ring, and when the docking sleeve is inserted into the annular groove, the limiting tooth is stuck in the limiting tooth groove under the action of the spring.

[0013] The utility model is further configured as follows: the hot air pipe is provided with a plurality of external ports and arranged along the axial direction of the shell.

[0014] The utility model is further configured as follows: annular baffles are installed at both ends of the shell, the outer ring of the baffle is connected to the shell, and the inner ring thereof has a certain gap with the rotary furnace body.

[0015] In summary, the utility model has the following beneficial effects:

[0016] A shell is arranged outside the rotary furnace body, and an induced draft tube is installed at the port of the rotary furnace body, so that the induced draft tube is connected to the induced draft fan and then connected to the hot air duct, and then the hot air duct is extended to the circumferential wall at the lower end of the shell. During the rotation of the rotary furnace, heat is continuously dissipated, and the rotary furnace needs to be preheated to 800℃ when working. Fuel is sprayed into the furnace head end and burned in the furnace. The smoke is discharged from the higher end of the rotary furnace body. The hot air duct can continuously supply heat to the outer wall of the rotary furnace body, saving preheating time and realizing waste heat recovery.

[0017] By setting up a filter, impurities can be prevented from being carried out by the induced draft fan during the waste heat collection process. A locking assembly is set on the connection mechanism. By pulling the pull rod, the docking sleeve can be removed from the annular groove, and then the filter can be removed and cleaned. When waste heat recovery is required, the docking sleeve is docked with the induced draft sleeve. Under the action of the spring, the limiting teeth are clamped in the corresponding limiting tooth grooves, and the outer circumferential wall of the docking sleeve is tightly against the inner ring wall of the sealing ring. The overall structure has a good sealing effect.

[0018] By providing an annular baffle, the loss of waste heat can be avoided and the waste heat recovery rate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 is a structural diagram of the docking mechanism;

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 It is a side view of the rotary furnace body and baffle.

[0023] Figure numerals: 1. Frame one; 2. Frame two; 3. Rotary furnace body; 4. Support wheel; 5. Support frame; 6. Shell; 7. Draft tube; 8. Frame three; 9. Draft fan; 10. Exhaust pipe; 11. Annular groove; 12. Filter screen; 13. Docking tube; 14. Sealing ring; 15. Mounting groove; 16. Baffle ring; 17. Through hole; 18. Pull rod; 19. Pull plate; 20. Limiting plate; 21. Spring; 22. Limiting tooth; 23. Limiting tooth groove; 24. Baffle; 25. Hot air pipe; 26. Feed barrel. DETAILED DESCRIPTION

[0024] The utility model is described in detail below in conjunction with the accompanying drawings.

[0025] Embodiment: A rotary kiln waste heat recovery device, which can realize the recovery and reuse of waste heat generated by the rotary kiln.

[0026] refer to Figure 1 , Figure 2 A rotary furnace waste heat recovery device comprises a horizontally arranged frame 1 and a frame 2, a common rotary furnace body 3 is mounted on the frame 1 and the frame 2 through a set of supporting wheels 4, one set of supporting wheels 4 is driven by a motor, the rotary furnace body 3 is tilted, and a feeding cylinder 26 is arranged on the outer wall of the higher end of the rotary furnace body 3, a supporting frame 5 is arranged below the rotary furnace body 3 and between the frame 1 and the frame 2, and a matching rotary furnace body 3 is sleeved on the rotary furnace body 3. Shell 6, shell 6 is supported by support frame 5, an induced draft tube 7 is installed at the port of the higher end of rotary furnace body 3 through a rotatable flange, the bottom of induced draft tube 7 is supported by frame three 8, and the outer end thereof is connected with induced draft fan 9 through outlet pipe 10, the air inlet of induced draft fan 9 is connected with the end of outlet pipe 10 away from rotary furnace body 3, and the air outlet thereof extends to the circumferential wall of the lower end of shell 6 and extends to the inside thereof through hot air pipe 25, and a detachable connecting mechanism is provided between induced draft tube 7 and outlet pipe 10. A shell 6 is arranged outside the rotary furnace body, and an induced draft tube 7 is installed at the port of the rotary furnace body 3, so that the air inlet and outlet of the induced draft fan 9 are connected to the induced draft tube 7 and the hot air pipe 25 respectively. The hot air pipe 25 extends to the circumferential wall at the lower end of the shell. Since the heat is continuously dissipated during the rotation of the rotary furnace body 6, the rotary furnace needs to be preheated to 800°C when it is working. The material is added through the feeding tube 26, and the fuel is sprayed into the furnace head end and burned in the furnace. The smoke is discharged from the higher end of the rotary furnace body 3. The hot air pipe 25 can continuously supply heat to the outer wall of the rotary furnace body 3, saving the preheating time and realizing the recovery of waste heat.

[0027] Combination Figure 2 Figure 3The connecting mechanism includes an annular groove 11 provided on the inner wall of the outer end of the induced draft tube 7, a filter screen 12 matching the filter screen 12 is longitudinally placed at the bottom of the annular groove 11, a docking sleeve 13 is connected to the end of the outlet pipe 10 away from the induced draft fan 9, a sealing ring 14 is arranged on the inner ring wall of the annular groove 11, the end of the docking sleeve 13 away from the outlet pipe is inserted into the annular groove 11, and the outer end wall of the docking sleeve 13 abuts against the filter screen 12, and its outer circumferential wall is tightly against the inner ring wall of the sealing ring 14, a locking assembly is arranged between the docking sleeve 13 and the induced draft tube 7, and the outlet pipe 10 is a high temperature resistant hose. The locking assembly includes a mounting groove 15 opened on the outer wall of the induced draft tube 7, a retaining ring 16 is arranged at the opening of the mounting groove 15, a through hole 17 is arranged at the bottom thereof, and the through hole 17 extends to the outside of the inner wall of the sealing ring 14, a pull rod 18 is passed through the mounting groove 15, the inner end of the pull rod 18 passes through the through hole 17 and is provided with a limiting tooth 22, and the outer end of the pull rod 18 passes through the retaining ring 16 and is provided with a pull plate 19, the limiting tooth 22 is arranged obliquely to the filter screen 12, a limiting tooth groove 23 matching the limiting tooth 22 is opened on the outer wall of the docking tube 13, and a limiting plate 20 is installed on the pull rod 18 located in the mounting groove 15, and a spring 21 is sleeved on the pull rod 18 and between the limiting plate 20 and the retaining ring 16. When the docking tube 13 is inserted into the annular groove 11, the limiting tooth 22 is stuck in the limiting tooth groove 23 under the action of the spring 21. The setting of the filter screen 12 can prevent impurities from being carried out by the induced draft fan 9 during the waste heat collection process. A locking assembly is set on the connecting mechanism. In conjunction with the high-temperature resistant hose, the pull rod 18 can be pulled to remove the docking sleeve 13 from the annular groove 11, and then the filter screen 12 can be disassembled and cleaned. When waste heat recovery is required, the docking sleeve 13 is docked with the induced draft tube 7. Under the action of the spring 21, the limiting teeth 22 are clamped in the corresponding limiting tooth grooves 23, and the outer circumferential wall of the docking sleeve 13 is tightly against the inner ring wall of the sealing ring 14. Due to the tooth direction setting of the limiting teeth 22, the docking sleeve 13 can only be removed by pulling the pull plate 19, and the overall structure has a good sealing effect.

[0028] refer to Figure 1 In order to make the rotary furnace body 3 heated evenly, the hot air pipe 25 is provided with a plurality of external ports and arranged along the axial direction of the shell.

[0029] Combination Figure 4 , an annular baffle 24 is installed at both ends of the shell, the outer ring of the baffle 24 is connected to the shell, and the inner ring thereof has a certain gap with the rotary furnace body 3. This arrangement can avoid the loss of waste heat and improve the waste heat recovery rate.

[0030] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A rotary kiln waste heat recovery device, characterized in that: The invention comprises a frame 1 and a frame 2 arranged in a horizontal direction, wherein a common rotary furnace body is installed on the frame 1 and the frame 2 through a supporting wheel group, wherein one group of supporting wheels is driven by a motor, the rotary furnace body is arranged obliquely, a feeding cylinder is arranged on the outer wall of the higher end of the rotary furnace body, a supporting frame is arranged between the frame 1 and the frame 2 below the rotary furnace body, a shell matching the rotary furnace body is sleeved on the rotary furnace body, and the shell is carried by the supporting frame; An induced draft tube is installed at the port at the higher end of the rotary furnace body through a rotatable flange, the bottom of the induced draft tube is supported by the frame three, and the outer end thereof is connected to an induced draft fan through an air outlet pipe, the air inlet of the induced draft fan is connected to the end of the air outlet pipe away from the rotary furnace body, and the air outlet thereof extends to the circumferential wall of the lower end of the shell through the hot air pipe and extends to the inside thereof; A detachable connecting mechanism is arranged between the air induced cylinder and the air outlet pipe.

2. The rotary kiln waste heat recovery device according to claim 1, characterized in that: The connecting mechanism comprises an annular groove provided on the inner wall of the outer end of the induced draft tube, a filter screen matching the filter screen is longitudinally placed at the bottom of the annular groove, a docking sleeve is connected to the end of the outlet pipe away from the induced draft fan, a sealing ring is arranged on the inner ring wall of the annular groove, the end of the docking sleeve away from the outlet sleeve is inserted into the annular groove, and the outer end wall of the docking sleeve abuts against the filter screen, and the outer circumferential wall thereof abuts against the inner ring wall of the sealing ring, and a locking assembly is arranged between the docking sleeve and the induced draft tube; The air outlet pipe is a high temperature resistant hose.

3. The rotary kiln waste heat recovery device according to claim 2, characterized in that: The locking assembly includes a mounting groove opened on the outer wall of the induced draft tube, a retaining ring is arranged at the opening of the mounting groove, a through hole is arranged at the bottom of the mounting groove, the through hole extends to the outside of the inner wall of the sealing ring, a pull rod is passed through the mounting groove, the inner end of the pull rod passes through the through hole and is provided with a limiting tooth, the outer end of the pull rod passes through the retaining ring and is provided with a pull plate, the limiting tooth is arranged obliquely to the filter screen, a limiting tooth groove matching the limiting tooth is opened on the outer wall of the docking sleeve, and a limiting plate is installed on the pull rod located in the mounting groove, a spring is sleeved on the pull rod and between the limiting plate and the retaining ring, when the docking sleeve is inserted into the annular groove, the limiting tooth is stuck in the limiting tooth groove under the action of the spring.

4. The rotary kiln waste heat recovery device according to claim 1, characterized in that: The hot air pipe is provided with a plurality of external ports and is arranged along the axial direction of the shell.

5. The rotary kiln waste heat recovery device according to claim 1, characterized in that: Annular baffles are installed at both ends of the shell, the outer ring of the baffle is connected to the shell, and the inner ring of the baffle has a certain gap with the rotary furnace body.

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