Temperature control system of alumina calcining kiln

Abstract

The utility model relates to an aluminum oxide roasting kiln temperature control system which comprises a fuel gas burner, a fuel gas inlet pipe, a combustion-supporting air inlet pipe, a high-pressure fan, a temperature sensor, a discharge flue, a first flow adjusting valve, a second flow adjusting valve and a controller. A horizontal isolation spray pipe is arranged on the upper portion of the vertical section of the smoke discharge flue, a third flow adjusting valve and an electromagnetic valve are arranged at the two ends of the blowing assisting pipe respectively, and a fourth flow adjusting valve is arranged on the smoke discharge accelerating blowing pipe. According to the utility model, the temperature in the roasting kiln can be automatically controlled, the temperature of the roasting kiln is stable, the product quality index is optimized, and the high-level stability is kept; after the thermal regulation of the roasting kiln is stable, the energy waste is reduced, and the product manufacturing cost is reduced; and after the temperature control precision is improved, the temperature fluctuation of the kiln body is avoided, the cracking frequency of the kiln body is greatly reduced, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to a temperature control system for an alumina roasting kiln and belongs to the technical field of alumina production. Background Art

[0002] γ-alumina is widely used in industries such as catalysts, pharmaceutical adsorbents, and combustion aids. Its main production process is to use a roasting kiln to roast special aluminum hydroxide to achieve its crystal transformation and form γ-alumina products. The roasting kiln uses manual control of the kiln temperature.

[0003] Disadvantages of existing technology:

[0004] 1. The roasting temperature is controlled manually, which has the disadvantages of large temperature fluctuation, wide fluctuation range and unstable roasting product indicators;

[0005] 2. It is difficult to ensure the stability of the thermal system of the roasting kiln by manual control, and the product quality index level is poor;

[0006] 3. Manual temperature control results in large temperature fluctuations, causing repeated temperature rise and fall in the kiln body, frequent kiln cracking, and a high equipment failure rate. Utility Model Content

[0007] The utility model provides an alumina roasting kiln temperature control system, which solves the problems of manual adjustment of the roasting kiln temperature, large temperature fluctuation, unstable roasting product indicators and poor product quality indicators.

[0008] The utility model relates to a temperature control system for an alumina roasting kiln, comprising a gas burner arranged on the roasting kiln, the gas burner is connected with a gas inlet pipe and a combustion-supporting air inlet pipe, the combustion-supporting air inlet pipe is connected with a high-pressure fan, a temperature sensor is arranged in the roasting kiln, a smoke exhaust duct is connected to the bottom of the roasting kiln, a flow regulating valve 1 and a flow regulating valve 2 are respectively arranged on the combustion-supporting air inlet pipe and the gas inlet pipe, the temperature sensor is connected with a controller, the combustion-supporting air inlet pipe is connected with a blowing-assisting pipe, an accelerating smoke exhaust blowing pipe is arranged at the bottom of the vertical section of the smoke exhaust duct, a horizontal isolation nozzle is arranged at the upper part of the vertical section of the smoke exhaust duct, a flat isolation nozzle is fixed at the inner end of the isolation nozzle, the isolation nozzle and the accelerating smoke exhaust blowing pipe are both connected to the blowing-assisting pipe, a flow regulating valve 3 and a solenoid valve are respectively arranged at both ends of the blowing-assisting pipe, a flow regulating valve 4 is arranged on the accelerating smoke exhaust blowing pipe, and the controller connects each flow regulating valve and solenoid valve.

[0009] As a preferred embodiment, a smoke exhaust pipe is connected to the top of the smoke exhaust duct.

[0010] As a preferred embodiment, a noise reduction box is provided on the outside of the high-pressure fan, an air inlet is provided on the side wall of the noise reduction box, and a connecting pipe connecting the high-pressure fan outlet and the combustion air inlet pipe is fixed on the top of the noise reduction box, which can reduce the noise generated by the high-pressure fan.

[0011] As a preferred embodiment, a connecting pipe is fixed at the bottom of the connecting pipe, the bottom of the connecting pipe is connected and fixed to the outlet of the high-pressure fan, and a section of bellows is provided on the connecting pipe to prevent the vibration generated by the high-pressure fan from being transmitted to the noise reduction box.

[0012] As a preferred embodiment, a support sleeve is provided in the air inlet of the noise reduction box, a sound-absorbing orifice plate is fixed at the inner end of the inner hole of the support sleeve, a support groove is provided at the outer end of the inner hole of the support sleeve, a dust-proof net is provided in the support groove, a limit retaining ring is provided on the outer side of the dust-proof net, the limit retaining ring and the support sleeve are fixed to the noise reduction box by fastening bolts, the sound-absorbing orifice plate can reduce noise and silence sound, the sound-absorbing orifice plate and the dust-proof net are both arranged in a detachable support sleeve, and the dust-proof net can be separated from the support sleeve for easy disassembly and cleaning.

[0013] The utility model has the following beneficial effects:

[0014] The temperature inside the firing kiln can be automatically controlled, the temperature of the roasting kiln is stable, the product quality indicators are optimized, and a high level of stability is maintained; after the thermal system of the roasting kiln is stabilized, energy waste is reduced and product manufacturing costs are reduced; after the temperature control accuracy is improved, the kiln temperature is avoided from fluctuating, the frequency of kiln cracking is greatly reduced, and the maintenance cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 It is a structural schematic diagram of the high-pressure fan;

[0017] In the figure: 1. high-pressure fan; 2. noise reduction box; 3. connecting pipe; 4. dustproof net; 5. bellows; 6. blow-assist pipe; 7. solenoid valve; 8. combustion air inlet pipe; 9. flow regulating valve one; 10. flow regulating valve two; 11. gas burner; 12. gas inlet pipe; 13. flow regulating valve four; 14. accelerated smoke exhaust blow pipe; 15. flow regulating valve three; 16. isolation nozzle; 17. firing kiln; 18. smoke exhaust duct; 19. isolation nozzle; 20. smoke exhaust pipe; 21. support sleeve; 22. silencer orifice plate. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with embodiments.

[0019] Embodiment 1, as Figure 1 to Figure 2As shown, the utility model is a temperature control system for an alumina roasting kiln, comprising a gas burner 11 arranged on a roasting kiln 17, the gas burner 11 is connected to a gas inlet pipe 12 and a combustion-supporting air inlet pipe 8, the combustion-supporting air inlet pipe 8 is connected to a high-pressure blower 1, a temperature sensor is arranged in the roasting kiln 17, a smoke exhaust duct 18 is connected to the bottom of the roasting kiln 17, a flow regulating valve 1 9 and a flow regulating valve 2 10 are respectively arranged on the combustion-supporting air inlet pipe 8 and the gas inlet pipe 12, the temperature sensor is connected to a controller, the controller is a PLC controller, and the temperature sensor The device is a thermocouple, the combustion air inlet pipe 8 is connected to the blowing-assisting pipe 6, the bottom of the vertical section of the smoke exhaust duct 18 is provided with an accelerating smoke exhaust blowing pipe 14, the upper part of the vertical section of the smoke exhaust duct 18 is provided with a horizontal isolation nozzle 16, the inner end of the isolation nozzle 16 is fixed with a flat isolation nozzle 19, the isolation nozzle 16 and the accelerating smoke exhaust blowing pipe 14 are both connected to the blowing-assisting pipe 6, the two ends of the blowing-assisting pipe 6 are respectively provided with a flow regulating valve three 15 and a solenoid valve 7, the accelerating smoke exhaust blowing pipe 14 is provided with a flow regulating valve four 13, and the controller connects each flow regulating valve and solenoid valve 7.

[0020] In the heating stage, the temperature sensor detects that the temperature in the firing kiln 17 is low, and the controller controls the flow regulating valve 1 9 and the flow regulating valve 2 10 to increase the supply of air and gas, thereby quickly raising the temperature. At this time, the solenoid valve 7 is opened, the flow regulating valve 4 13 is closed, the flow regulating valve 3 15 is opened, and the isolation nozzle 16 sprays gas to form an isolation gas wall, reduce smoke exhaust, and accelerate temperature increase. When the firing kiln 17 enters the firing stage, when the temperature sensor detects that the temperature is too high, the controller controls the flow regulating valve 1 9 and the flow regulating valve 2 10 to reduce the supply of air and gas, and the flow regulating valve 4 13 is opened, and the flow regulating valve 3 15 is closed, so as to accelerate the exhaust speed in the exhaust duct and reduce the temperature in the kiln.

[0021] Embodiment 2, based on embodiment 1, a smoke exhaust pipe 20 is connected to the top of the smoke exhaust duct 18 .

[0022] A noise reduction box 2 is provided outside the high-pressure fan 1, an air inlet is provided on the side wall of the noise reduction box 2, and a connecting pipe 3 connecting the outlet of the high-pressure fan 1 and the combustion air inlet pipe 8 is fixed on the top of the noise reduction box 2.

[0023] A connecting pipe is fixed at the bottom of the connecting pipe 3 , the bottom of the connecting pipe is connected and fixed to the outlet of the high-pressure blower 1 , and a section of bellows 5 is provided on the connecting pipe.

[0024] A support sleeve 21 is provided in the air inlet of the noise reduction box 2, a silencer orifice plate 22 is fixed to the inner end of the inner hole of the support sleeve 21, a support groove is provided at the outer end of the inner hole of the support sleeve 21, a dust screen 4 is provided in the support groove, a limit retaining ring is provided on the outer side of the dust screen 4, and the limit retaining ring and the support sleeve 21 are fixed to the noise reduction box 2 by fastening bolts. When cleaning the dust screen 4 and the silencer orifice plate 22, the fastening bolts can be unscrewed, and then the support sleeve 21 can be taken out, and then the dust screen 4 can be removed for cleaning, and the silencer orifice plate 22 can be cleaned. After cleaning, the support sleeve 21 is inserted into the air inlet, and then the dust screen 4 is supported at the support groove, and then the limit retaining ring is covered, and then the fastening bolts are screwed on.

[0025] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0026] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

Claims

1. A temperature control system for an alumina roasting kiln, comprising a gas burner (11) arranged on a roasting kiln (17), the gas burner (11) being connected to a gas inlet pipe (12) and a combustion air inlet pipe (8), the combustion air inlet pipe (8) being connected to a high-pressure fan (1), a temperature sensor being arranged in the roasting kiln (17), and a smoke exhaust duct (18) being connected to the bottom of the roasting kiln (17), characterized in that: A flow regulating valve 1 (9) and a flow regulating valve 2 (10) are respectively provided on the combustion-supporting air inlet pipe (8) and the fuel gas inlet pipe (12); a temperature sensor is connected to a controller; the combustion-supporting air inlet pipe (8) is connected to a blow-assisting pipe (6); an accelerating smoke exhaust blow pipe (14) is provided at the bottom of the vertical section of the smoke exhaust duct (18); a horizontal isolation nozzle (16) is provided at the upper part of the vertical section of the smoke exhaust duct (18); a flat isolation nozzle (19) is fixed at the inner end of the isolation nozzle (16); the isolation nozzle (16) and the accelerating smoke exhaust blow pipe (14) are both connected to the blow-assisting pipe (6); a flow regulating valve 3 (15) and a solenoid valve (7) are respectively provided at both ends of the blow-assisting pipe (6); a flow regulating valve 4 (13) is provided on the accelerating smoke exhaust blow pipe (14); and the controller connects each flow regulating valve and solenoid valve (7).

2. The alumina roasting kiln temperature control system according to claim 1, characterized in that: The top of the smoke exhaust duct (18) is connected to a smoke exhaust pipe (20).

3. The alumina roasting kiln temperature control system according to claim 1, characterized in that: A noise reduction box (2) is provided on the outside of the high-pressure fan (1), an air inlet is provided on the side wall of the noise reduction box (2), and a connecting pipe (3) connecting the outlet of the high-pressure fan (1) and the combustion air inlet pipe (8) is fixed on the top of the noise reduction box (2).

4. The alumina roasting kiln temperature control system according to claim 3, characterized in that: A connecting pipe is fixed at the bottom of the connecting pipe (3), the bottom of the connecting pipe is connected and fixed to the outlet of the high-pressure blower (1), and a section of corrugated pipe (5) is provided on the connecting pipe.

5. The alumina roasting kiln temperature control system according to claim 3, characterized in that: A support sleeve (21) is provided in the air inlet of the noise reduction box (2), a silencer plate (22) is fixed to the inner end of the inner hole of the support sleeve (21), a support groove is provided at the outer end of the inner hole of the support sleeve (21), a dustproof net (4) is provided in the support groove, a limit retaining ring is provided on the outer side of the dustproof net (4), and the limit retaining ring and the support sleeve (21) are fixed to the noise reduction box (2) by fastening bolts.

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