CN103600938A - Automatic coal dredging device for raw coal conveying system in thermal power plant - Google Patents
Automatic coal dredging device for raw coal conveying system in thermal power plant Download PDFInfo
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- CN103600938A CN103600938A CN201310488919.5A CN201310488919A CN103600938A CN 103600938 A CN103600938 A CN 103600938A CN 201310488919 A CN201310488919 A CN 201310488919A CN 103600938 A CN103600938 A CN 103600938A
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Abstract
The invention discloses an automatic coal dredging device for a raw coal conveying system in a thermal power plant. The automatic coal dredging device comprises a plurality of air jet holes and an air supply system, the air jet holes are formed in the inner wall of a raw coal conveying system device, the air supply system is communicated with the air jet holes through air pipelines, and the operating state of the air supply system is changed by a control system. The automatic coal dredging device is simple in structure, convenient to operate, low in cost, high in economic performance and safe and reliable in operation, less vibration is generated, and normal operation of other devices cannot be affected. By the aid of the automatic coal dredging device, the problem of coal blockage failure due to various reasons is fundamentally and thoroughly solved, and normal coal supply of a coal feeder and normal operation of a subsequent device are ensured.
Description
Technical field
The present invention relates to the defeated coal of thermal powerplant field, particularly a kind of for dredging the dredger of coal charge.
Background technology
The normal operation of powder manufacturing apparatus in heat power plant boiler system is the key of boiler normal combustion, whether normal processing and the Boiler Stable Combustion that directly affects pulverized coal preparation system of coal supply, therefore in boiler normal course of operation, normal enough coal supplies of delivery system are vital.Conveyer system of raw coal 1 comprises the former coal bunker 11 that stores raw coal, successively by adapter bonnet 12, the feeder 15 that coal spout 14 is communicated with former coal bunker coal dropping port, between adapter bonnet 12 and coal spout 14, be provided with feeder coal-in port gate valve 13, the lower coal mouth below of feeder 15 is provided with the feed belt 16 that transmits raw coal to coal mill, raw coal in former coal bunker drops to feeder from the coal dropping port of former coal bunker through adapter bonnet by gravity, feed belt through feeder below is sent to coal mill again, often can be because former pit ash inferior be large in the process of raw coal transmission, viscosity is large, particularly at raw coal high humidity in rainy season, make the raw coal in former coal bunker on feeder top, occur overstocking phenomenon, cause former coal bunker to stop up, can not guarantee enough coal-supplying amounts, cause the coal amount that enters coal mill to reduce, affect the operation of coal mill and follow-up equipment, further cause boiler combustion unstable, unit load shedding, reduce the safety and economic operation efficiency of boiler.
At present, in the process of the normal operation of feeder, while there is chute blockage phenomenon, below normal employing, three kinds of modes are processed: the mode that 1) adopts vibrator to beat, shortcoming is that vibration is large, easily affects the operation of other equipment, and work efficiency is not high, sometimes also there is the defect of shaking more real and more real, even make anti-clogging coal liner plate on coal bunker wall get loose and cause more serious consequence.2) method that adopts sledgehammer manually to beat, sledgehammer easily smashes equipment, and labour intensity is large, even more rapping, coal cinder is more solid, and not only operating efficiency is low, even may threaten to staff's safety.3) use air bubble or dredging machine, shortcoming is also that efficiency is not high, and operating maintenance work capacity is large.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of automatic sparse device for coal being applied in thermal powerplant conveyer system of raw coal, the chute blockage fault causing due to a variety of causes be can fundamentally thoroughly solve, the normal coal supply of feeder and the normal operation of follow-up equipment guaranteed.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
Automatic sparse device for coal for thermal powerplant conveyer system of raw coal, comprise the gas supply system that is arranged on several air nozzles on conveyer system of raw coal equipment inner wall and is communicated with air nozzle by air duct, described gas supply system changes mode of operation by control system.
The concrete structure of described gas supply system is: described gas supply system comprises the air compressor being communicated with thermal powerplant compressed air system by pipeline, the mouth of air compressor is by pipeline communication one storage tank, and the mouth of storage tank is communicated with each air nozzle by air duct respectively; On described each air duct, a valve is set respectively.
The improvement of gas supply system of the present invention is: in described storage tank, be provided with the temperature booster for heated compressed air, the controlled end connection control system of temperature booster.
The concrete structure of described control system is: described control system comprises control housing, be arranged in conveyer system of raw coal feed belt top, feeder below for gathering the disconnected coal signal pickup assembly of lower coal amount and being arranged on the electromagnetic valve on each air duct; The input end of described control housing is connected with the mouth of disconnected coal signal pickup assembly, and the mouth of control housing is connected with the controlled end of temperature booster and each electromagnetic valve respectively.
The concrete structure of described disconnected coal signal pickup assembly is: the inductor of described disconnected coal signal pickup assembly for being hinged on the baffle plate in coal mouth frame under feeder and triggered by baffle plate amplitude of fluctuation by bearing pin, and the mouth of inductor connects the input end of control housing; The amplitude of fluctuation of described baffle plate is determined according to coal-feeding quantity.
The another kind of structure of described disconnected coal signal pickup assembly is: described disconnected coal signal pickup assembly is the weighing and sensing assembly that is arranged on feed belt below, and the mouth of weighing and sensing assembly connects the input end of control housing.
Improvement of the present invention is: described in be arranged on the mode of operation that air nozzle in conveyer system of raw coal adopts contrary raw coal throughput direction alternately to open successively.
Owing to having adopted technique scheme, the technological advance that the present invention obtains is:
The present invention is simple in structure, easy to operate, with low cost, economic performance is high.The present invention, in thin coal process, controls gas supply system by control system, thereby realize from the inwall of each equipment of conveyer system of raw coal, starts to dredge coal operation, by gas, raw coal is dredged, the vibration producing is less, safe and reliable to operation, does not affect the normal operation of other equipment.Requirement unattended, full automatic control that application of the present invention can realize, conveyer system of raw coal stops up after disconnected coal, can automatically collect signal, further realize and dredge automatic startup, the automatic dredging of coal operation and automatically stop, the fundamentally thorough chute blockage fault causing due to a variety of causes that solves, guarantees the normal coal supply of feeder and the normal operation of follow-up equipment.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is control principle schematic diagram of the present invention.
Wherein: 1. conveyer system of raw coal, 11. former coal bunkers, 12. adapter bonnets, 13. gate valves, 14. coal spouts, 15. feeders, 16. feed belts, 2. air nozzle, 3. gas supply system 31. air compressors, 32. storage tanks, 33. valves, 34. temperature boosters, 4. control system, 41. control housings, 42. disconnected coal signal pickup assemblies, 421. baffle plates, 422. inductors, 423. weighing and sensing assemblies, 43. electromagnetic valves, 5. air duct.
The throughput direction that in Fig. 1, the direction of arrow is raw coal.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details:
For an automatic sparse device for coal for thermal powerplant conveyer system of raw coal, its structural representation as shown in Figure 1.Comprise gas supply system 3, control system 4 and several air nozzles 2, wherein air nozzle 2 is arranged on respectively on the inwall of conveyer system of raw coal 1 each equipment, air nozzle 2 is communicated with gas supply system 3 by air duct 5, and gas supply system 3 changes mode of operation under the control of control system 4.
Conveyer system of raw coal described in the present embodiment comprises former coal bunker 11, adapter bonnet 12, gate valve 13, coal spout 14, feeder 15 and the feed belt 16 of complying with raw coal throughput direction and setting gradually from top to bottom, and air nozzle is provided with five altogether.Wherein in coal spout 14, be provided with the first air nozzle, adapter bonnet 12 is provided with the second air nozzle, and former coal bunker 11 is disposed with the 3rd air nozzle, the 4th air nozzle and the 5th air nozzle from bottom to top.
Wherein gas supply system 3 comprises air compressor 31, storage tank 32, valve 33 and temperature booster 34.The quantity of valve 33 is identical with the quantity of air nozzle 2, is separately positioned on the pipeline that connects air nozzle; Temperature booster 34 is arranged in storage tank, and the controlled end connection control system 4 of temperature booster 34 starts or closes under the instruction of control system, is used in the winter time the pressurized air of storage tank being heated during startup.The input end of air compressor 31 is communicated with thermal powerplant compressed air system by pipeline, and the mouth of air compressor 31 is by pipeline communication one storage tank 32, and the mouth of storage tank 32 is communicated with each air nozzle 2 by air duct 5 respectively.
Disconnected coal signal pickup assembly 42 can be the array configuration of baffle plate 421 and inductor 422, can be also the weighing and sensing assembly 423 arranging separately.
As adopt the array configuration of baffle plate 421 and inductor 422,421, baffle plate is hinged under feeder in coal mouth frame by bearing pin, under the effect of baffle plate raw coal on feed belt to raw coal throughput direction deflection; Inductor 422 is also arranged in the frame of coal mouth under feeder, and triggered by baffle plate amplitude of fluctuation; The mouth of inductor connects the input end of control housing; The amplitude of fluctuation of described baffle plate is determined according to coal-feeding quantity.Adopt the disconnected coal signal pickup assembly of this kind of version, in operation process, when the normal raw coal amount of carrying of feed belt is normal, baffle plate certain angle that tilts, now baffle plate can trigger inductor, control housing receives inductor when triggering state, does not start electromagnetic valve action, air duct cut-off; When raw coal amount reduces, illustrate that conveyer system of raw coal stops up, now baffle plate angle of inclination diminishes, cannot trigger inductor, controller does not receive the signal that inductor returns, and just starts to start electromagnetic valve action, and air duct is opened, air nozzle, to jet in conveyer system of raw coal, reaches the effect that dispels raw coal.
When disconnected coal signal pickup assembly 42 as separately employing weighing and sensing assembly 423, weighing and sensing assembly 423 is arranged on to the below of feed belt, for measuring the raw coal amount of carrying on feed belt, when raw coal amount is during lower than standard value, weighing and sensing assembly 423 sends signal to control housing, and control housing is controlled electromagnetic valve action after receiving signal, and air duct is opened, air nozzle, to jet in conveyer system of raw coal, reaches the effect that dispels raw coal.
Certainly two kinds of disconnected coal signal pickup assembly 42 versions described in the present invention can be arranged in conveyer system of raw coal simultaneously, with the raw coal amount that guarantees accurately to detect to fall from feeder.
The working process of the present embodiment is as described below:
Open the gate valve 13 of feeder coal inlet, successively to feeder, coal mill and follow-up equipment convey materials.
When there is not obstruction in raw coal normal descend, the throughput direction of raw coal is as shown in the sensing of arrow in Fig. 1, raw coal in coal bunker enters former coal bunker, through the gate valve 13 of adapter bonnet 12, feeder entrance, send into feeder 15 after the coal spout 14 of feeder import, raw coal falls into the feed belt 16 of feeder below after feeder, thereby realizes to coal mill feeding.
When stopping up appears in raw coal in delivery system, disconnected coal signal pickup assembly collects the raw coal amount of sending into feed belt and can not meet the demands, cause the belt coal that breaks, disconnected coal signal pickup assembly sends the alerting signal of " belt break coal " to control housing, the electromagnetic valve simultaneously starting on each air duct moves.
At control housing, control in the process of electromagnetic valve action the mode of operation that adopts air nozzle alternately to open successively against raw coal throughput direction.First open and be arranged in the electromagnetic valve being arranged on the first air duct being communicated with coal spout the first air nozzle, make the first air nozzle spray air-flow to coal spout, the driving surface that pressurized air enters coal spout carries out the dredging in coal seam; When reaching preset time, control housing is closed the electromagnetic valve on the first air duct, open the electromagnetic valve being arranged on the second air duct being communicated with the second air nozzle in adapter bonnet simultaneously, make the second air nozzle spray air-flow to adapter bonnet, the driving surface that pressurized air enters adapter bonnet carries out the dredging in coal seam; The like, then close the second air nozzle and open the 3rd air nozzle, close the 3rd air nozzle and open the 4th air nozzle, close the 4th air nozzle and open the 5th air nozzle, until the 5th preset dredging time of air nozzle arrived, first round dredging process finishes, thereby realizes the fixed-time control that contrary raw coal throughput direction is dredged successively.
After completing a high pressure draft dredging process, if disconnected coal signal still exists, control housing is controlled electromagnetic valve action, carries out second and takes turns dredging, until raw coal can normally be carried.
The present invention is as used in the winter time, raw coal is because humidity is larger, in the course of conveying of raw coal, easily there is the phenomenon that coal cinder is icing, therefore in raw coal course of conveying, need the coal cinder to freezing freeze or be dried, now control housing can be controlled the temperature booster that is arranged in storage tank and enter mode of operation, and according to the temperature value of setting in control housing, pressurized air is carried out to Automatic-heating, thereby make pressurized air raw coal be freezed and be dried in thin coal process.
When the present invention also can realize the running state of gas supply system by manual control mode, under the state of now all opening at electromagnetic valve, the valve of manually controlling on an air duct just can be realized manually thin coal.
Claims (7)
1. for the automatic sparse device for coal of thermal powerplant conveyer system of raw coal, it is characterized in that: comprise several air nozzles (2) that are arranged on conveyer system of raw coal (1) equipment inner wall and the gas supply system (3) being communicated with air nozzle (2) by air duct (5), described gas supply system (3) changes mode of operation by control system (4).
2. the automatic sparse device for coal for thermal powerplant conveyer system of raw coal according to claim 1, it is characterized in that: described gas supply system (3) comprises the air compressor (31) being communicated with thermal powerplant compressed air system by pipeline, the mouth of air compressor (31) is by pipeline communication one storage tank (32), and the mouth of storage tank (32) is communicated with each air nozzle (2) by air duct (5) respectively; One valve (33) is set respectively on described each air duct (5).
3. the automatic sparse device for coal for thermal powerplant conveyer system of raw coal according to claim 2, it is characterized in that: in described storage tank, be provided with the temperature booster (34) for heated compressed air, the controlled end connection control system (4) of temperature booster (34).
4. the automatic sparse device for coal for thermal powerplant conveyer system of raw coal according to claim 1, is characterized in that: described control system (4) comprises control housing (41), is arranged on feed belt top, the middle feeder of conveyer system of raw coal (1) below for gathering the disconnected coal signal pickup assembly (42) of lower coal amount and being arranged on the electromagnetic valve (43) on each air duct (5); The input end of described control housing is connected with the mouth of disconnected coal signal pickup assembly (42), and the mouth of control housing is connected with the controlled end of temperature booster and each electromagnetic valve (43) respectively.
5. the automatic sparse device for coal for thermal powerplant conveyer system of raw coal according to claim 4, it is characterized in that: the inductor (422) of described disconnected coal signal pickup assembly (42) for being hinged on the baffle plate (421) in coal mouth frame under feeder and triggered by baffle plate amplitude of fluctuation by bearing pin, the mouth of inductor connects the input end of control housing; The amplitude of fluctuation of described baffle plate is determined according to coal-feeding quantity.
6. the automatic sparse device for coal for thermal powerplant conveyer system of raw coal according to claim 4, it is characterized in that: described disconnected coal signal pickup assembly (42) is for being arranged on the weighing and sensing assembly (423) of feed belt below the input end of the mouth connection control housing of weighing and sensing assembly.
7. according to the automatic sparse device for coal for thermal powerplant conveyer system of raw coal described in claim 4 to 6 any one, it is characterized in that: described in be arranged on the mode of operation that air nozzle in conveyer system of raw coal adopts contrary raw coal throughput direction alternately to open successively.
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| CN201310488919.5A CN103600938B (en) | 2013-10-18 | 2013-10-18 | Automatic coal dredging device for raw coal conveying system in thermal power plant |
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| CN201310488919.5A CN103600938B (en) | 2013-10-18 | 2013-10-18 | Automatic coal dredging device for raw coal conveying system in thermal power plant |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103979230A (en) * | 2014-05-20 | 2014-08-13 | 国家电网公司 | High pressure steam hopper dredging device |
| CN104384148A (en) * | 2014-11-20 | 2015-03-04 | 中冶焦耐工程技术有限公司 | Coal-fired sleeve shaft kiln injection unblocking system |
| CN105460440A (en) * | 2015-12-28 | 2016-04-06 | 莱歇研磨机械制造(上海)有限公司 | Powder-bin flow assisting system |
| CN109250524A (en) * | 2017-07-13 | 2019-01-22 | 大唐环境产业集团股份有限公司 | A kind of anti-blocking device for discharging |
| CN112791834A (en) * | 2021-01-21 | 2021-05-14 | 烟台龙源电力技术股份有限公司 | Coal pulverizer prevent stifled device and boiler |
| CN116300665A (en) * | 2023-05-24 | 2023-06-23 | 山东宏桥新型材料有限公司 | Linkage interlocking control circuit of air cannon |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103979230A (en) * | 2014-05-20 | 2014-08-13 | 国家电网公司 | High pressure steam hopper dredging device |
| CN104384148A (en) * | 2014-11-20 | 2015-03-04 | 中冶焦耐工程技术有限公司 | Coal-fired sleeve shaft kiln injection unblocking system |
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| CN109250524A (en) * | 2017-07-13 | 2019-01-22 | 大唐环境产业集团股份有限公司 | A kind of anti-blocking device for discharging |
| CN112791834A (en) * | 2021-01-21 | 2021-05-14 | 烟台龙源电力技术股份有限公司 | Coal pulverizer prevent stifled device and boiler |
| CN116300665A (en) * | 2023-05-24 | 2023-06-23 | 山东宏桥新型材料有限公司 | Linkage interlocking control circuit of air cannon |
| CN116300665B (en) * | 2023-05-24 | 2023-10-13 | 山东宏桥新型材料有限公司 | Linkage interlocking control circuit of air cannon |
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| CN103600938B (en) | 2017-01-11 |
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Address after: 050031 No. 6 Jianbei Street, Chang'an District, Shijiazhuang City, Hebei Province Patentee after: China Electric Power Construction Group Hebei electric survey and Design Research Institute Co., Ltd. Address before: 050031 No. 6 Jianbei Street, Chang'an District, Shijiazhuang City, Hebei Province Patentee before: Hebei Province Power Surveying Design & Research Institute |
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