CN207805793U - Supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system - Google Patents
Supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system Download PDFInfo
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- CN207805793U CN207805793U CN201721705080.6U CN201721705080U CN207805793U CN 207805793 U CN207805793 U CN 207805793U CN 201721705080 U CN201721705080 U CN 201721705080U CN 207805793 U CN207805793 U CN 207805793U
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Abstract
The utility model discloses supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving systems, the system includes primary air fan, air preheater, heat primary air pipe, cold primary air piping, flue gas recirculation bypass duct, coal pulverizer hot wind bypass duct, coal pulverizer hot wind controllable register, coal pulverizer cold wind controllable register, flue gas recirculation by-pass damper, coal pulverizer hot wind bypasses controllable register, coal pulverizer, feeder, tailing separator, primary wind and powder pipeline, burner, boiler, controller, pulverizer outlet temperature detector, coal pulverizer exports oxygen concentration detector and tube cell hygrosensor；The utility model increases flue gas recirculation bypass duct in medium-speed pulverizer unit pulverized-coal system, improves pulverizer outlet temperature, promotes pulverizer capacity, reduces unit power consumption of coal pulverizing；Increase coal pulverizer hot wind bypass duct outside coal pulverizer, realize wind powder temperature decoupling control in pulverizer outlet temperature and a tube cell, improve wind powder mixture temperature, reduce the coal dust latent heat of vaporization and ignition heat, coal powder ignition and combustion stability are improved, the adaptability that fired power generating unit participates in depth peak regulation is improved.
Description
Technical field
The utility model belongs to coal pulverizer and automatically controls and field of energy-saving technology, and in particular to a kind of supercritical unit middling speed
Pulverizer outlet temperature optimal control for energy saving system.
Background technology
Pulverized coal preparation system is the important component of fossil-fired unit, during Chinese large-sized coal-burning power plant is equipped with mostly at present
Speed mill unit pulverized-coal system.Unit pulverized-coal system has many advantages, such as to take up an area less, is characteristics of compact layout, simple in structure, flexible and convenient,
But compared with the ball type pulverizer system, direct-fired mill is contributed need to follow the demand of boiler load in real time, continuous,
It is evenly supplied the coal dust needed for Boiler Stable Combustion.Fired power generating unit is to adapt to new situations new change, participates in power grid depth peak regulation gesture
It must go, how ensure depth peak regulation operating mode, apparatus of thermo-electric power boiler low-load combustion-stabilizing is at a current research hotspot problem.Coal-grinding
The temperature of machine outlet wind powder mixture is the major influence factors for influencing coal powder ignition and surely firing.Pulverizer outlet temperature is high, coal
The moisture that powder contains is few, and with regard to low, coal dust more preferably catches fire and surely fires the latent heat of vaporization and ignition heat needed for coal powder ignition.Coal pulverizer goes out
Mouth temperature improves, and also helps the drying process of coal dust and improves pulverizer capacity, reduces unit power consumption of coal pulverizing.But coal pulverizer exports
Temperature cannot be excessively high, excessively high that volatile matter substance in coal dust can be caused to be precipitated, and increases coal pulverizer detonation fire risk.Meanwhile coal-grinding
Machine outlet temperature height can also influence the safe and stable operation of coal pulverizer lubricating oil system.
Typical medium-speed pulverizer unit pulverized-coal system mostly uses the cold First air mechanism powder of positive pressure, mainly pre- by primary air fan, sky
The compositions such as device, feeder, coal pulverizer, separator and burner.Primary air fan is placed in before air preheater, it is boosted from primary air fan
First air afterwards is divided into two-way, enters heat primary air pipe after air preheater heats all the way, and another way is directly entered cold primary air piping,
The cold wind of the hot wind of heat primary air pipe and cold primary air piping enters coal pulverizer after being mixed before coal pulverizer, and hot wind and cool air hose are equal
It is provided with controllable register, respectively coal pulverizer hot wind controllable register and coal pulverizer cold wind controllable register.Coal pulverizer hot wind adjusts gear
Plate control primary air flow, coal pulverizer cold wind controllable register control pulverizer outlet temperature, the two cooperation complete coal dust drying and
Conveying task.Raw coal mill forming the coal dust of certain fineness after feeder is sent into coal pulverizer, coal dust be mixed after one
The secondary air-dried dry and coal pulverizer that blows off enters separator, and qualified coal dust through pulverized coal channel after separator by being sent directly into burner hearth combustion
Burner is burnt, and underproof coal dust, which returns to coal pulverizer, to be continued to mill.
Be not difficult to find out from the principle and operation characteristic of the above medium-speed pulverizer unit pulverized-coal system, coal pulverizer drier at
It is divided into air, oxygen concentration is normal oxygen concentration, generally 21% or so.Coal pulverizer ventilation quantity is identical as tube cell ventilation quantity,
Ignore under heat dispersal situations, pulverizer outlet temperature and coal dust tube cell temperature after coal pulverizer of blowing off are essentially identical.If coal-grinding can be reduced
Machine internal oxygen concentration then can avoid detonation risk inside coal pulverizer, and properly increasing pulverizer outlet temperature can't influence to grind
The safe operation of coal machine, while pulverizer capacity can be improved, reduce unit power consumption of coal pulverizing.If the tube cell entry position after coal pulverizer
Heat primary air is mixed, then can further increase wind powder mixture temperature, reduces the latent heat of vaporization and ignition heat of coal dust, improves coal
Powder catches fire and combustion stability.
Invention content
Technical problem to be solved in the utility model is to overcome current medium-speed pulverizer unit pulverized-coal system wind powder temperature
Degree control defect, provides a kind of supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system, in medium-speed pulverizer blow-through
Flue gas recirculation bypass duct is increased in formula pulverized coal preparation system, is not influencing fired power generating unit medium-speed pulverizer safe and stable operation
On the basis of, pulverizer outlet temperature is improved, pulverizer capacity is promoted, reduces unit power consumption of coal pulverizing.Increase coal pulverizer outside coal pulverizer
Hot wind bypass duct realizes wind powder temperature decoupling control in pulverizer outlet temperature and a tube cell, improves wind powder mixture temperature
Degree reduces the coal dust latent heat of vaporization and ignition heat, improves coal powder ignition and combustion stability, improves fired power generating unit and participates in depth peak regulation
Adaptability.
In order to achieve the above object, the utility model adopts the following technical solution：
Supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system, including primary air fan 1, primary air fan 1
Outlet divides two-way, is connected to heat primary air pipe 3 by air preheater 2 all the way, another way is directly connected to cold primary air piping 4；Heat primary air
Coal pulverizer hot wind controllable register 7 and coal pulverizer cold wind controllable register 8 are respectively arranged on pipe 3 and cold primary air piping 4；Heat primary air
Pipe 3 is connected to 11 entrance of coal pulverizer with the outlet of cold primary air piping 4, and coal pulverizer 11 is also connected to the feeder 12 for feeding raw coal, gives
The outlet of coal machine 12 is provided with tailing separator 13；Qualified coal dust is exported through tailing separator 13 and is blown out, and passes through primary wind and powder pipeline
The burner 15 that 14 connections are arranged on boiler 16；It is connected to by coal pulverizer hot wind between tailing separator 13 and heat primary air pipe 3
Road pipeline 6, setting coal pulverizer hot wind bypasses controllable register 10 on coal pulverizer hot wind bypass duct 6；The outlet of the coal pulverizer 11 is also
It is provided with pulverizer outlet temperature detector, coal pulverizer outlet oxygen concentration detector；14 end of primary wind and powder pipeline is also
It is provided with tube cell hygrosensor；Further include controller, the controller is exported with pulverizer outlet temperature detector, coal pulverizer
Oxygen concentration detector is connected with tube cell hygrosensor.
11 entrance of the coal pulverizer is also connected to flue gas recirculation bypass duct 5, is provided on flue gas recirculation bypass duct 5
To adjust the flue gas recirculation by-pass damper 9 of flue gas recycled amount.
The flue gas recycled of the flue gas recirculation bypass duct 5 draws mouth and is arranged in house outlet position.
The burner 15 is mounted on 16 lower portion of boiler.
Compared with the prior art, advantage is the utility model：
Coal pulverizer exit gas temperature is improved by the way that flue gas recirculation bypass is arranged, pulverizer capacity is improved, reduces
Unit power consumption of coal pulverizing, while being also most important effect：It is reduced by reduction coal pulverizer internal oxygen concentration quick-fried inside coal pulverizer
Ignite the risk of fire.The solution of pulverizer outlet temperature and primary wind and powder pipe temperature is realized by the way that the bypass of coal pulverizer hot wind is arranged
Coupling controls so that and the temperature of a mixture of powder and dust is not limited by coal pulverizer lubrication system works temperature, is largely increased,
Reduce the latent heat of vaporization and ignition heat needed for coal powder ignition, improve coal dust catch fire and combustion stability.
Description of the drawings
Fig. 1 is the system structure diagram of the utility model embodiment.
Fig. 2 is the Control system architecture block diagram described in the utility model embodiment.
In all the appended drawings, identical reference numeral is used for indicating identical equipment or structure, wherein：
1- primary air fans, 2- air preheaters, 3- heat primary air pipes, the cold primary air pipings of 4-, 5- flue gas recirculation bypass ducts, 6-
Coal pulverizer hot wind bypass duct, 7- coal pulverizer hot wind controllable registers, 8- coal pulverizer cold wind controllable registers, the bypass of 9- flue gas recirculations
Baffle, 10- coal pulverizer hot winds bypass controllable register, 11- coal pulverizers, 12- feeders, 13- tailing separators, 14- primary wind and powders
Pipeline, 15- burners, 16- boilers.
Specific implementation mode
It is with reference to the accompanying drawings and embodiments, right in order to make the technical solution of the utility model and advantage be more clearly understood
Utility model technical solution is described in detail.It should be appreciated that specific embodiment described herein is only used to explain this reality
With novel, the scope of protection of the utility model is not limited to the embodiment.
Embodiment
Fig. 1 is the system structure diagram of the utility model embodiment, and primary air fan 1 is placed in before air preheater 2, cold air
It is divided into two-way after the boosting of primary air fan 1, enters heat primary air pipe 3 after the heating of air preheater 2 all the way, another way is directly entered cold
The cold wind of primary air piping 4, the hot wind of heat primary air pipe 3 and cold primary air piping 4 enters coal pulverizer after being mixed before coal pulverizer 11
11, controllable register, respectively coal pulverizer hot wind controllable register 7 and coal-grinding are both provided on heat primary air pipe 3 and cold primary air piping 4
Machine cold wind controllable register 8.Raw coal mill forming the coal dust of certain fineness, coal dust quilt after feeder 12 is sent into coal pulverizer 11
Mixed First air is dry and the coal pulverizer 11 that blows off enters tailing separator 13, after qualified coal dust is by tailing separator 13
It is sent directly into burner 15 through primary wind and powder pipeline 14, in 16 burner hearth internal-combustion of boiler, underproof coal dust returns to coal pulverizer
11 continue to mill.Tailing separator 13 is arranged in 11 top of coal pulverizer, and burner 15 is mounted on 16 lower portion of boiler, burner
Primary wind and powder pipeline 14 is connected between 15 and tailing separator 13.Flue gas recirculation bypass duct 5 is connected with coal pulverizer 11,
Flue gas recirculation by-pass damper 9 is disposed on flue gas recirculation bypass duct 5, to adjust flue gas recycled amount.Coal pulverizer heat
Wind bypass duct 6 is connected between heat primary air pipe 3 and primary wind and powder pipeline 14, and coal pulverizer hot wind by-pass damper 10 is arranged in mill
On coal machine hot wind bypass duct 6, for adjusting coal pulverizer gas bypass amount.
Fig. 2 is the Control system architecture block diagram described in the utility model embodiment, pulverizer outlet temperature detector, coal-grinding
Machine outlet oxygen concentration detector, tube cell hygrosensor are connected with controller respectively, the control instruction control that controller is sent out
Coal pulverizer hot wind controllable register, coal pulverizer cold wind controllable register, flue gas recirculation by-pass damper and coal pulverizer hot wind bypass gear
Plate aperture.
If coal pulverizer exports oxygen concentration and exports oxygen concentration setting value higher than coal pulverizer, controller sends out instruction, closes
Small flue gas recirculation by-pass damper 9, and big 7 aperture of coal pulverizer hot wind controllable register is opened, while adjusting coal pulverizer cold wind and adjusting gear
8 aperture of plate realizes that coal pulverizer outlet oxygen concentration is always below coal pulverizer outlet oxygen concentration setting value.If coal pulverizer outlet temperature
Degree is less than pulverizer outlet temperature setting value, then controller sends out instruction, opens big coal pulverizer hot wind controllable register 7, and turn down mill
Coal machine cold wind controllable register 8, while the aperture of flue gas recirculation by-pass damper 9 is adjusted, maintain pulverizer outlet temperature setting
Value.If pulverizer outlet temperature is higher than pulverizer outlet temperature setting value, controller sends out instruction, turns down coal pulverizer hot wind tune
Baffle 7 is saved, and opens big coal pulverizer cold wind controllable register 8, while adjusting the aperture of flue gas recirculation by-pass damper 9, maintains coal-grinding
Machine outlet temperature is in setting value.If tube cell temperature is less than tube cell desired temperature, controller sends out instruction, opens big coal pulverizer heat
10 aperture of wind by-pass damper, and turn down 8 aperture of coal pulverizer cold wind controllable register, open big 9 aperture of flue gas recirculation by-pass damper, it ties up
Tube cell temperature is held in setting value.If tube cell temperature is higher than tube cell desired temperature, controller sends out instruction, turns down coal pulverizer heat
10 aperture of wind by-pass damper, and open big 8 aperture of coal pulverizer cold wind controllable register, turn down 9 aperture of flue gas recirculation by-pass damper, it ties up
Tube cell temperature is held in setting value.
In unit load change process, according to primary air flow definite value, big or reduction coal pulverizer hot wind tune is proportionally opened
Save opening for baffle 7, coal pulverizer cold wind controllable register 8, flue gas recirculation by-pass damper 9 and coal pulverizer hot wind by-pass damper 10
Degree makes primary air flow action have no substantial effect on pulverizer outlet temperature and tube cell temperature, realizes each link decoupling control.
Claims (3)
1. supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system, it is characterised in that：Including primary air fan
(1), primary air fan (1) outlet divides two-way, is connected to heat primary air pipe (3) by air preheater (2) all the way, another way is directly connected to cold
Primary air piping (4)；Coal pulverizer hot wind controllable register (7) and mill are respectively arranged on heat primary air pipe (3) and cold primary air piping (4)
Coal machine cold wind controllable register (8)；Heat primary air pipe (3) is connected to coal pulverizer (11) entrance with the outlet of cold primary air piping (4), mill
Coal machine (11) is also connected to the feeder (12) for feeding raw coal, and coal pulverizer (11) outlet is provided with tailing separator (13)；Qualified coal
Powder is exported through tailing separator (13) and is blown out, the burner being arranged on boiler (16) by primary wind and powder pipeline (14) connection
(15)；Coal pulverizer hot wind bypass duct (6), coal pulverizer hot wind are communicated between tailing separator (13) and heat primary air pipe (3)
Coal pulverizer hot wind is set on bypass duct (6) and bypasses controllable register (10)；Coal pulverizer (11) outlet is additionally provided with coal pulverizer
Outlet temperature detector, coal pulverizer export oxygen concentration detector；Primary wind and powder pipeline (14) end is additionally provided with tube cell
Hygrosensor；Further include controller, the controller is visited with pulverizer outlet temperature detector, coal pulverizer outlet oxygen concentration
Device is surveyed with tube cell hygrosensor to be connected.
2. supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system according to claim 1, feature
It is：Coal pulverizer (11) entrance is also connected to flue gas recirculation bypass duct (5), and flue gas recirculation bypass duct is set on (5)
It is equipped with to adjust the flue gas recirculation by-pass damper (9) of flue gas recycled amount.
3. supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system according to claim 2, feature
It is：The flue gas recycled of flue gas recirculation bypass duct (5) draws mouth and is arranged in house outlet position.
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| CN201721705080.6U CN207805793U (en) | 2017-12-08 | 2017-12-08 | Supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855210A (en) * | 2017-12-08 | 2018-03-30 | 西安热工研究院有限公司 | Supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system and method |
| CN110124842A (en) * | 2019-05-15 | 2019-08-16 | 广东电网有限责任公司 | A kind of boiler controller system and its pulverizer outlet temperature control method and system |
| CN110848727A (en) * | 2019-12-04 | 2020-02-28 | 国网浙江省电力有限公司电力科学研究院 | Adjusting method for improving boiler load response rate |
| CN111318361A (en) * | 2020-04-07 | 2020-06-23 | 西安热工研究院有限公司 | Coal mill powder leakage online monitoring and sealing air adjusting system and method |
| CN112024108A (en) * | 2020-08-17 | 2020-12-04 | 上海电力大学 | Grading heating powder making system based on heat pipe technology and control method thereof |
| CN113280360A (en) * | 2021-06-25 | 2021-08-20 | 西安热工研究院有限公司 | Coal mill operation method suitable for deep peak shaving of boiler |
| CN113294799A (en) * | 2021-05-27 | 2021-08-24 | 东方电气集团东方锅炉股份有限公司 | Hot primary air and air-powder mixture heat exchange system |
| CN113457831A (en) * | 2021-06-30 | 2021-10-01 | 苏州西热节能环保技术有限公司 | Coal mill outlet temperature control method |
-
2017
- 2017-12-08 CN CN201721705080.6U patent/CN207805793U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855210A (en) * | 2017-12-08 | 2018-03-30 | 西安热工研究院有限公司 | Supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system and method |
| CN110124842A (en) * | 2019-05-15 | 2019-08-16 | 广东电网有限责任公司 | A kind of boiler controller system and its pulverizer outlet temperature control method and system |
| CN110848727A (en) * | 2019-12-04 | 2020-02-28 | 国网浙江省电力有限公司电力科学研究院 | Adjusting method for improving boiler load response rate |
| CN111318361A (en) * | 2020-04-07 | 2020-06-23 | 西安热工研究院有限公司 | Coal mill powder leakage online monitoring and sealing air adjusting system and method |
| CN112024108A (en) * | 2020-08-17 | 2020-12-04 | 上海电力大学 | Grading heating powder making system based on heat pipe technology and control method thereof |
| CN113294799A (en) * | 2021-05-27 | 2021-08-24 | 东方电气集团东方锅炉股份有限公司 | Hot primary air and air-powder mixture heat exchange system |
| CN113280360A (en) * | 2021-06-25 | 2021-08-20 | 西安热工研究院有限公司 | Coal mill operation method suitable for deep peak shaving of boiler |
| CN113457831A (en) * | 2021-06-30 | 2021-10-01 | 苏州西热节能环保技术有限公司 | Coal mill outlet temperature control method |
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