CN204460265U - Coal dust piece-rate system in a kind of boiler milling system - Google Patents
Coal dust piece-rate system in a kind of boiler milling system Download PDFInfo
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- CN204460265U CN204460265U CN201520077575.3U CN201520077575U CN204460265U CN 204460265 U CN204460265 U CN 204460265U CN 201520077575 U CN201520077575 U CN 201520077575U CN 204460265 U CN204460265 U CN 204460265U
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Abstract
The utility model discloses coal dust piece-rate system in a kind of boiler milling system, belong to pulverized coal preparation and piece-rate system technical field.This system comprises dynamic coal dust classifier, static coal powder separator, medium-speed pulverizer, bellows, manual adjustments deflector and a Pulverized Coal fired Boiler Furnace, described bellows are used for providing First air, and raw coal and First air enter medium-speed pulverizer respectively by pipeline; Medium-speed pulverizer is multiple stage, and the exit of every platform medium-speed pulverizer connects a dynamic coal dust classifier or static coal powder separator; Dynamic coal dust classifier is connected Pulverized Coal fired Boiler Furnace with static coal powder separator respectively by pipeline; Described dynamic coal dust classifier is one or two, and static coal powder separator is multiple stage; Wherein dynamic coal dust separator outlet sprays into burner hearth containing the First air of fine breeze at boiler upper section.This system is used for can adjusting boiler reheat steam temperature and flue gas NO in the medium-speed pulverizer unit pulverized-coal system of coal-fired power station boiler
xdischarge capacity is low.
Description
Technical field
The utility model belongs to pulverized coal preparation and piece-rate system technical field, is specifically related to coal dust piece-rate system in a kind of boiler milling system, and this system is used in the medium-speed pulverizer unit pulverized-coal system of coal-fired power station boiler.
Background technology
Coal dust piece-rate system is the important component part of power station boiler pulverizing system, directly affects economy and the security of station boiler unit in its performance, cost and service life.In addition, functional, cheap coal dust piece-rate system improves one of the economic benefit in power station and the necessary requirement of social benefit.The thermal power generation unit of the domestic thermal power generation unit of current China and import, the pulverized coal preparation system of same boiler all adopts the coal dust classifier composition coal dust piece-rate system of same types and model, in various degree there are some problems being difficult to overcome.As: when coal dust piece-rate system all adopts inertia separator or static centrifugal coal dust classifier, easily there is upper furnace coking, vapor (steam) temperature is higher, efficiency of combustion is on the low side and be unfavorable for flue gas NO
xthe problem reduced discharging; When coal dust piece-rate system all adopts dynamic coal dust classifier, easily occur that pulverized coal preparation system fault rate is high, maintenance workload large, the coking of boiler-burner region, problem that vapor (steam) temperature is on the low side, simultaneity factor is more complicated also.The problems referred to above are unfavorable for improving economy that boiler controller system runs, security and the feature of environmental protection.
Utility model content
The purpose of this utility model is for overcoming above-mentioned weak point of the prior art, and provide coal dust piece-rate system in a kind of boiler milling system, this system can adjust boiler reheat steam temperature and flue gas NO
xdischarge capacity is low.
The technical scheme that the utility model adopts is as follows:
Coal dust piece-rate system in a kind of boiler milling system, comprise dynamic coal dust classifier, static coal powder separator, medium-speed pulverizer, bellows, manual adjustments deflector and a Pulverized Coal fired Boiler Furnace, wherein: described bellows are used for providing First air, the First air that raw coal and bellows provide enters medium-speed pulverizer respectively by pipeline; Described medium-speed pulverizer is multiple stage, and the exit of every platform medium-speed pulverizer connects a dynamic coal dust classifier or static coal powder separator; Described dynamic coal dust classifier is connected Pulverized Coal fired Boiler Furnace with static coal powder separator respectively by pipeline; Described dynamic coal dust classifier is one or two, and static coal powder separator is multiple stage, each dynamic coal dust classifier and static coal powder separator parallel arrangement.
Manual adjustments deflector is provided with for the entrance place be connected with dynamic coal dust classifier in described bellows.
The inside of described Pulverized Coal fired Boiler Furnace is divided into multilayer, and the number of plies is identical with the quantity of coal pulverizer, and every layer, the inside of Pulverized Coal fired Boiler Furnace arranges burner.Described dynamic coal dust classifier connects upper strata (ground floor in described Pulverized Coal fired Boiler Furnace by pipeline, or first and second layers) burner that arranges, described static coal powder separator connects by pipeline the burner that in described Pulverized Coal fired Boiler Furnace, lower floor is arranged.
Described static coal powder separator adopts armstrong's patent adjustment mode, and dynamic coal dust classifier adopts electric adjustable perfect square formula.
The utility model design principle is as follows:
This coal dust piece-rate system is made up of static coal powder separator, dynamic coal dust classifier, medium-speed pulverizer etc.After raw coal and First air enter medium-speed pulverizer, raw coal is ground into coal dust.Coal dust is carried out coal pulverizer by First air, and enters coal dust classifier.Through coal dust classifier, First air carries the qualified coal dust of granularity and enters burner hearth and carry out combustion process; The separated device of defective coal dust that granularity is larger separates, and returns to enter coal pulverizer and mill.Be made up of multiple stage coal pulverizer in system, respectively the burner of corresponding burner hearth different layers.Every platform coal pulverizer outlet configuration coal dust classifier, the breeze airflow of being drawn by this separator enters same layer burner in burner hearth.In system, coal pulverizer model is identical, but coal dust classifier model is incomplete same.Wherein corresponding with the most last layer of burner hearth or two-layer burner coal dust classifier is dynamic coal dust classifier, for controlling in thinner scope by qualified coal powder size; Other coal dust classifier is still conventional static coal powder separator.
Needed for all coal pulverizers, First air is all derived from large-scale bellows, and above-mentioned coal dust classifier configuration mode, when dissimilar coal dust classifier drag characteristic there are differences, is unfavorable for that the air feed between coal pulverizer distributes adjustment; Therefore, the coal pulverizer wind channel entrance (in bellows) that the utility model is being equipped with dynamic coal dust classifier is provided with manual adjustments deflector, and this deflector can reduce the complexity that in running, each pulverizer' s primary air flow regulates.
In the utility model boiler milling system, the advantage of coal dust classifier system is:
1, in the utility model, common static coal dust classifier still selected by most of coal dust classifier, and its structure is simple, the feature of failure rate is low is fully applied.
2, corresponding with the most last layer of burner hearth or two-layer burner in the utility model coal dust classifier is dynamic coal dust classifier, for controlling in thinner scope by the coal powder size of most last layer or two-layer burner; Be conducive to realizing reducing vapor (steam) temperature and reducing NO simultaneously
xthe function of concentration of emission.
3, the utility model alleviates coal dust classifier in the medium-speed pulverizer unit pulverized-coal system of coal-fired power station boiler and adopts the problem produced during same model.As: when coal dust piece-rate system all adopts inertia separator or static centrifugal coal dust classifier, easily there is upper furnace coking, vapor (steam) temperature is higher, efficiency of combustion is on the low side and be unfavorable for flue gas NO
xthe problem reduced discharging; When coal dust piece-rate system all adopts dynamic coal dust classifier, easily occur that pulverized coal preparation system fault rate is high, maintenance workload large, the coking of boiler-burner region, problem that vapor (steam) temperature is on the low side, simultaneity factor is more complicated also.
4, the utility model boiler milling system coal dust classifier abnormal shape combination configuration mode, adds the means of boiler combustion adjustment, is conducive to the transition adjustment of variable parameter operation.
5, the coal pulverizer wind channel entrance (in bellows) that the utility model is being equipped with dynamic coal dust classifier is provided with manual adjustments deflector, and each coal pulverizer First air drag characteristic can be made to be tending towards reasonable.
Accompanying drawing explanation
Fig. 1 is system configuration schematic diagram of the present utility model
Fig. 2 is schematic process flow diagram of the present utility model.
In figure: 1-bellows; 2-medium-speed pulverizer; The dynamic coal dust classifier of 3-; 4 ?static coal powder separator; 5 ?Pulverized Coal fired Boiler Furnace; 6 ?burner; 7 ?deflector.
Detailed description of the invention
Below in conjunction with accompanying drawing in detail the utility model is described in detail.
The utility model system configuration as shown in Figure 1.Mainly comprise medium-speed pulverizer, static coal powder separator, dynamically coal dust classifier, First air pipeline and burner composition.Wherein dynamic separator supply topmost H or G, H grate firing burner coal dust; Other A-G or A-F grate firing burner supplied by static separation device.Under the condition of conventional low nitrogen burning secondary air system being carried out to suitably adjustment, utilize reburning technology, a part of NOx in combustion product is reduced into N2.In large-sized boiler, realize this process, fuel sprays from the top in primary zone, causes a kind of micro-fuel-rich material environmental area, be called reburning zone.The nitrogen oxide that primary zone is formed is reduced into nitrogen molecular in this region.Top, reburning zone adds burnout degree, the carbon monoxide of oxidation reburning zone and remaining fuel.
The coal pulverizer wind channel entrance (in bellows) that the utility model is being equipped with dynamic coal dust classifier is provided with manual adjustments deflector, the preferred structure of one as shown in Figure 2, this system comprises dynamic coal dust classifier 3, static coal powder separator 4, medium-speed pulverizer 2, bellows 1, manual adjustments deflector 7 and Pulverized Coal fired Boiler Furnace 5, wherein: described bellows 1 are for providing First air, the First air that raw coal and bellows 1 provide enters medium-speed pulverizer 2 respectively by pipeline, manual adjustments deflector 7 is provided with for the entrance place be connected with dynamic coal dust classifier 3 in bellows 1.
Described medium-speed pulverizer 2 is multiple stage, and the exit of each medium-speed pulverizer 2 connects dynamic coal dust classifier 3 and static coal powder separator 4 respectively; Described dynamic coal dust classifier 3 and static coal powder separator 4 are in parallel arrangement.
The inside of described Pulverized Coal fired Boiler Furnace 5 is divided into multilayer, every layer arranges burner 6, dynamic coal dust classifier 3 connects the burner 6 of topmost ground floor by pipeline, static coal powder separator 4 connects the burner 6 of other layer in burner hearth respectively by pipeline, thus realizes the connection of dynamic coal dust classifier 3 and static coal powder separator 4 and Pulverized Coal fired Boiler Furnace 5.
The coal dust classifier that most of medium-speed pulverizer of the present utility model adopts is static separation device, its top is circumferentially uniformly distributed multiple deflector baffle, adjust in the angle of coal pulverizer hull outside to baffle plate, wind powder mixes platform logistics and changes flow direction through baffle plate, coal dust realizes being separated under centrifugal force with Action of Gravity Field, and the rough coal powder separated sinks to the district that mills and again grinds.In unit pulverized-coal system, after being separated, qualified coal dust is carried by First air and is transported to burner through coal pipe and burns.As less demanding (as R90 about 30%) to fineness of pulverized coal, this static separation device or less expensive practicality.
The fuel of burning coal powder more of the present utility model delivers to burner through dynamic rotary separator.Dynamic rotary separator both can be driven by variable-frequency motor, also can be driven by hydraulic means.Separator relies on rotor turns, makes band powder flow rotation; Rotating speed is higher, and the centrifugal force that particle is subject to is larger, and the particle that diameter is less also can be separated.Ensure that fineness of pulverized coal can regulate according to ature of coal and load variations situation, add the economy of unit.It effectively can reduce the cycle-index of coal dust in coal pulverizer inside; When grinding conventional fineness coal dust, grinding efficiency and coal pulverizer ability can be improve.
Claims (6)
1. coal dust piece-rate system in a boiler milling system, it is characterized in that: this system comprises dynamic coal dust classifier, static coal powder separator, medium-speed pulverizer, bellows, manual adjustments deflector and a Pulverized Coal fired Boiler Furnace, wherein: described bellows are used for providing First air, the First air that raw coal and bellows provide enters medium-speed pulverizer respectively by pipeline; Described medium-speed pulverizer is multiple stage, and the exit of every platform medium-speed pulverizer connects a dynamic coal dust classifier or static coal powder separator; Described dynamic coal dust classifier is connected Pulverized Coal fired Boiler Furnace with static coal powder separator respectively by pipeline; Described dynamic coal dust classifier is one or two, and static coal powder separator is multiple stage.
2. coal dust piece-rate system in boiler milling system according to claim 1, is characterized in that: be provided with manual adjustments deflector for the entrance place be connected with dynamic coal dust classifier in described bellows.
3. coal dust piece-rate system in boiler milling system according to claim 1, is characterized in that: each dynamic coal dust classifier and static coal powder separator are juxtaposition.
4. coal dust piece-rate system in boiler milling system according to claim 1, it is characterized in that: the inside of described Pulverized Coal fired Boiler Furnace is divided into multilayer, the number of plies is identical with the quantity of coal pulverizer, and every layer, the inside of Pulverized Coal fired Boiler Furnace arranges burner.
5. coal dust piece-rate system in boiler milling system according to claim 4, it is characterized in that: described dynamic coal dust classifier connects by pipeline the burner that in described Pulverized Coal fired Boiler Furnace, upper strata is arranged, described static coal powder separator connects by pipeline the burner that in described Pulverized Coal fired Boiler Furnace, lower floor is arranged.
6. coal dust piece-rate system in boiler milling system according to claim 1, is characterized in that: described static coal powder separator adopts armstrong's patent adjustment mode, and dynamic coal dust classifier adopts electric adjustable perfect square formula.
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| CN201520077575.3U CN204460265U (en) | 2015-02-03 | 2015-02-03 | Coal dust piece-rate system in a kind of boiler milling system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489761A (en) * | 2018-03-20 | 2018-09-04 | 国电科学技术研究院有限公司 | Powder prevents outer spray apparatus |
| CN109028129A (en) * | 2018-08-17 | 2018-12-18 | 国电科学技术研究院有限公司 | A kind of station boiler and its for pulverized coal system |
| CN109268870A (en) * | 2018-10-30 | 2019-01-25 | 苏州吉杰电力科技有限公司 | A kind of pulverized coal preparation system that flame kernel is controllable mill dislocation pulverized coal channel arragement construction |
| CN109855113A (en) * | 2018-12-24 | 2019-06-07 | 新奥数能科技有限公司 | A kind of method and apparatus preventing station boiler slagging |
-
2015
- 2015-02-03 CN CN201520077575.3U patent/CN204460265U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489761A (en) * | 2018-03-20 | 2018-09-04 | 国电科学技术研究院有限公司 | Powder prevents outer spray apparatus |
| CN109028129A (en) * | 2018-08-17 | 2018-12-18 | 国电科学技术研究院有限公司 | A kind of station boiler and its for pulverized coal system |
| CN109268870A (en) * | 2018-10-30 | 2019-01-25 | 苏州吉杰电力科技有限公司 | A kind of pulverized coal preparation system that flame kernel is controllable mill dislocation pulverized coal channel arragement construction |
| CN109855113A (en) * | 2018-12-24 | 2019-06-07 | 新奥数能科技有限公司 | A kind of method and apparatus preventing station boiler slagging |
| CN109855113B (en) * | 2018-12-24 | 2020-09-08 | 新奥数能科技有限公司 | Method and device for preventing power station boiler from slagging |
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