CN202538906U - Coordinated control system of milling system of double-inlet double-outlet coal mill - Google Patents
Coordinated control system of milling system of double-inlet double-outlet coal mill Download PDFInfo
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- CN202538906U CN202538906U CN2012201394774U CN201220139477U CN202538906U CN 202538906 U CN202538906 U CN 202538906U CN 2012201394774 U CN2012201394774 U CN 2012201394774U CN 201220139477 U CN201220139477 U CN 201220139477U CN 202538906 U CN202538906 U CN 202538906U
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Abstract
The utility model discloses a coordinated control system of a milling system of a double-inlet double-outlet coal mill. The coordinated control system comprises a fuel main control unit, a fuel quantity calculation unit, a mill capacity air and air volume conversion fuel quantity unit and a mill hot air regulation valve unit, wherein the fuel quantity calculation unit and the mill capacity air and air volume conversion fuel quantity unit are in matched connection with the fuel main control unit in sequence; and the mill hot air regulation valve unit is in matched with the mill capacity air and air volume conversion fuel quantity unit. The coordinated control system of the milling system of the double-inlet double-outlet coal mill can overcome the defects such as poor stability, weak anti-interference capacity and low quantitative control accuracy and the like in the prior art and has the advantages that good stability, strong anti-interference capacity and high quantitative control accuracy are realized.
Description
Technical field
The utility model relates to power plant and coordinates the control field, particularly, relates to a kind of coordinated control system of double inlet and outlet coal mill pulverized coal preparation system.
Background technology
In recent years, double-inlet and double-outlet steel ball coal mill is simple because of having system, and the equipment that puts into operation is few; Coal adapts to stronger; Reliable, efficient is high, and the boiler load response speed is fast, coal-air ratio is low, it is stable to exert oneself, fineness of pulverized coal is high; Characteristics such as sufficient combustion become the main powder manufacturing apparatus of thermal power plant direct blow boiler pulverized coal preparation system gradually.And than before medium-speed pulverizer, self characteristics are arranged in coordinated control system (CCS) design and control procedure.
In the prior art, the technological process of double-inlet and double-outlet steel ball coal mill pulverized coal preparation system is following:
Raw coal gets into mixer by run coal bin through feeder, by bypass wind predrying after, get into coal pulverizer through quill shaft and grind.After once hot and cold wind mixes, get into coal pulverizer, coal dust is blown out, and, get into burner hearth by coal dust classifier and burn with after bypass wind mixes through the capacity windshield plate.Because this system does not have the powder storehouse of middle bin system, system is greatly simplified.Exerting oneself of coal pulverizer decided by the capacity wind through coal pulverizer fully, thereby rapid to the response of load, can reach the ability of fast lifting load, and especially a wind is fairly obvious to the influence of unit output.The staving of coal pulverizer has certain storage powder ability again, and therefore, this system has concurrently direct-firing and advantage the ball type pulverizer system, and adjustment very flexibly.
In the regulating loop and elementary tactics of existing double-inlet and double-outlet steel ball coal mill pulverized coal preparation system, whole pulverized coal preparation system mainly contains following regulating loop:
⑴ the control of coal pulverizer load
Coal dust is taken coal pulverizer out of by capacity wind, in mill, under the certain situation in powder position (being that wind/powder is than certain), controls the flow of capacity wind, just can control exerting oneself of mill.
Consider that the position that big multicapacity wind measuring point is installed do not have enough straight lengths, if there is some problem again in measurement mechanism itself, will cause air measuring inaccurate, system is difficult for stablizing, and exists to disturb in bigger.So present design is the instruction of fuel master control forms the capacity air quantity after the dynamic Feedforward of f (x) and application of load instruction a set-point; On average instruct with capacity wind then and carry out the proportional integral computing and form control instruction, and do not constitute closed loop with the capacity wind flow of reality.Like this, the disturbance that causes because of air measuring just has been overcome.But also there is a shortcoming in this scheme: the fuel master control is instructed when constant, and capacity wind also should be constant.If capacity air quantity fluctuation, system can't overcome rapidly disturbs in this, and after will waiting until that vapour pressure changes, adjusts the capacity air quantity again, and this just causes the disturbance of unit operation operating mode, and more than the main vapour pressure deviation up 1MPa of our factory, the stable state time reaches 600S.Therefore, this is a makeshift, should capacity wind measuring point be marked as far as possible.
⑵ the control of coal pulverizer total blast volume
The total blast volume of coal pulverizer comprises capacity wind and bypass wind, and capacity wind is used for pulverized coal conveying, and flow is directly proportional with the load of mill, and bypass wind has two effects: the minimum total blast volume of dry raw coal and assurance prevents that coal dust from depositing at pipeline.The curve f (x) of total blast volume has guaranteed the air quantity setting value greater than minimum total blast volume, but does not utilize bypass wind to grinding the regulating action of mouthful steam temperature.
⑶ the control of coal pulverizer powder position
The advantage of mill of going with each other all the time is fast to the response of load variations, and its reason is that the change of the power of grinding is that change through the capacity wind flow changes, and precondition is, it is constant that the material level of mill must keep, and promptly wind/powder is than constant.
⑷ the control of coal pulverizer outlet temperature
The outlet temperature of mill is through getting into a wind-warm syndrome control of coal pulverizer.Regulate cold wind, a hot-air damper and come wind-warm syndrome of proportioning.Two baffle plates are all controlled outlet temperature, and the disturbance of air quantity must strengthen.Do not consider the process of warm mill in addition yet; Do not control the outlet temperature of mill this moment; And the inlet wind-warm syndrome of control mill; At this moment standard-sized sheet hot blast door is closed cold-air flap, generally is heated to more than 60 ℃ just can start, and the outlet temperature of controlling mill according to the size and the hot and cold throttle opening size of coal-supplying amount then is within normal range (NR).
At present, control strategy commonly used has two kinds:
⑴ the control aspect of pulverizer capacity; Directly adopt the capacity air quantity is controlled; Be unit direct capacity air quantity of control coal pulverizer under coordination mode, in this case, when unit load changes and when needing coal pulverizer to change to exert oneself; It is to change exerting oneself of coal pulverizer through the judgement to the capacity wind flow, that is to say the aperture of confirming the capacity air door according to needed capacity wind flow.Advantage is to realize quantitative high-precision control; Can find out relation curve through quantitative Analysis between load and air quantity; Shortcoming is the accuracy of measurement proposition high requirement to air quantity; And owing to reasons such as space structure and measuring cell installations, capacity wind air quantity accurately, stably measured is exactly this one of control difficult point of double inlet and outlet coal mill just always, brings a lot of interference problems to control.
⑵ the control aspect of pulverizer capacity; Directly the capacity throttle opening is controlled, promptly unit is directly controlled the capacity air quantity of coal pulverizer under coordination mode, in this case; Unit is under coordination mode; When external load changed, boiler master output directly acted on the capacity air door of coal pulverizer, and came to provide fast unit load required capacity wind flow according to the valve characteristic of capacity air door; Advantage is when unit load changes, can change exerting oneself of coal pulverizer in time, fast, and shortcoming is to realize quantitative high-precision control.
In the process that realizes the utility model, the inventor finds to exist at least in the prior art poor stability, antijamming capability is weak and defectives such as quantitative control accuracy is low.
The utility model content
The purpose of the utility model is, to the problems referred to above, proposes a kind of coordinated control system of double inlet and outlet coal mill pulverized coal preparation system, with realize good stability, antijamming capability is strong and the quantitative high advantage of control accuracy.
Another purpose of the utility model is, proposes a kind of control method for coordinating of double inlet and outlet coal mill pulverized coal preparation system.
For realizing above-mentioned purpose; The technical scheme that the utility model adopts is: a kind of coordinated control system of double inlet and outlet coal mill pulverized coal preparation system; Comprise the fuel main control unit; The fuel quantity that is connected with said fuel main control unit successively calculates unit and mill capacity wind air quantity convert fuel amount unit, and the mill hot blast adjustment doors unit that is connected with said mill capacity wind air quantity convert fuel amount unit matching.
Further, the coordinated control system of above-described double inlet and outlet coal mill pulverized coal preparation system also comprises the fuel command control module, and said fuel command control module and fuel main control unit are connected.
Further, the coordinated control system of above-described double inlet and outlet coal mill pulverized coal preparation system also comprises mill capacity wind bypass wind unit, and said mill capacity wind bypass wind unit is connected with mill capacity wind air quantity convert fuel amount unit matching.
Further, the coordinated control system of above-described double inlet and outlet coal mill pulverized coal preparation system also comprises feeder feed flow setup unit, and said feeder feed flow setup unit calculates unit matching with fuel quantity and is connected.
Further, the coordinated control system of above-described double inlet and outlet coal mill pulverized coal preparation system also comprises the total blast volume measuring unit, and said total blast volume measuring unit is connected with mill capacity wind air quantity convert fuel amount unit matching.
Particularly, the operation principle of above-mentioned fuel command control module, fuel main control unit, fuel quantity calculating unit, capacity wind air quantity convert fuel amount unit, coal pulverizer hot blast regulon and coal pulverizer capacity wind bypass wind unit is following:
The fuel command control module is used to accept the greatest amount of fuel restriction (guarantee coal-air ratio in allowed band, avoid the coal amount excessive, can not fully burn) that boiler master controller instructs and total blast volume is controlled to fuel and obtains fuel master control instruction through the little controller that selects;
The fuel main control unit is used for carrying out the PID computing with fuel master control instruction and revised fuel quantity, forms the fuel quantity instruction;
Fuel quantity calculates the unit, and the fuel quantity after being used for proofreading and correct with many coal pulverizers (like three coal pulverizers) and fuel flow sum are as total fuel quantity;
Capacity wind air quantity convert fuel amount unit is used for through two capacity wind aperture feedback signals instantaneous feeder coal-supplying amount being revised, and obtains the dynamic instantaneous coal amount correction value of coal pulverizer;
Coal pulverizer hot blast regulon is used for controlling wind main-piping pressure of coal pulverizer through coal pulverizer hot blast controllable register, guarantees that main-piping pressure keeps stable;
Coal pulverizer capacity wind bypass wind unit is used for controlling the coal pulverizer total blast volume through coal pulverizer capacity air door; Simultaneously, bypass air door control selects functional block to be implemented in air quantity adjustment separator outlet pressure when on the low side through height, avoids chute blockage; Accept the total blast volume instruction when air quantity is higher, guarantee the normal proportioning of coal-air ratio.
Simultaneously, another technical scheme of the utility model employing is: a kind of control method for coordinating of double inlet and outlet coal mill pulverized coal preparation system comprises:
Aspect the control of pulverizer capacity, adopt mill hot blast adjustment doors unit to carry out the hot blast pitch, control mill main-piping pressure.
Further, the control method for coordinating of above-described double inlet and outlet coal mill pulverized coal preparation system also comprises:
Adopt mill capacity wind air quantity convert fuel amount unit, coal-grinding capacity wind aperture is converted into fuel quantity, directly be used for pulverizer capacity control through fair curve;
Simultaneously, adopt mill capacity wind bypass wind unit, select functional block to be implemented in air quantity adjustment separator outlet pressure when on the low side, avoid chute blockage through height; Accept the total blast volume instruction when air quantity is higher, guarantee the normal proportioning of coal-air ratio.
Further, the control method for coordinating of above-described double inlet and outlet coal mill pulverized coal preparation system also comprises:
Adopt the total blast volume measuring unit, when unit load changes coal pulverizer exert oneself can be in time, change fast.
The coordinated control system of the double inlet and outlet coal mill pulverized coal preparation system of each embodiment of the utility model; Because this system comprises the fuel main control unit; The fuel quantity that is connected with the fuel main control unit successively calculates unit and mill capacity wind air quantity convert fuel amount unit, and the mill hot blast adjustment doors unit that is connected with mill capacity wind air quantity convert fuel amount unit matching; When unit load changes, can make exerting oneself of coal pulverizer can be in time, change fast; Thereby can overcome poor stability in the prior art, antijamming capability weak with the quantitative low defective of control accuracy, with realize good stability, antijamming capability is strong and the quantitative high advantage of control accuracy.
Further feature of the utility model and advantage will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through implementing the utility model.The purpose of the utility model can realize through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtain with other advantages.
Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.
Description of drawings
Accompanying drawing is used to provide the further understanding to the utility model, and constitutes the part of specification, is used to explain the utility model with the embodiment of the utility model, does not constitute the restriction to the utility model.In the accompanying drawings:
Fig. 1 is the operation principle sketch map according to the coordinated control system of the utility model double inlet and outlet coal mill pulverized coal preparation system;
Fig. 2 is the configuration sketch map according to the fuel command control module of the coordinated control system of the utility model double inlet and outlet coal mill pulverized coal preparation system;
Fig. 3 is the configuration sketch map according to the fuel main control unit of the coordinated control system of the utility model double inlet and outlet coal mill pulverized coal preparation system;
Fig. 4 is the configuration sketch map that calculates the unit according to the fuel quantity of the coordinated control system of the utility model double inlet and outlet coal mill pulverized coal preparation system;
Fig. 5 is the configuration sketch map according to the mill capacity wind air quantity convert fuel amount unit of the coordinated control system of the utility model double inlet and outlet coal mill pulverized coal preparation system;
Fig. 6 is the configuration sketch map according to the mill capacity wind bypass wind unit of the coordinated control system of the utility model double inlet and outlet coal mill pulverized coal preparation system;
Fig. 7 is the configuration sketch map according to the feeder feed flow setup unit of the coordinated control system of the utility model double inlet and outlet coal mill pulverized coal preparation system;
Fig. 8 is the configuration sketch map according to the mill hot blast adjustment doors unit of the coordinated control system of the utility model double inlet and outlet coal mill pulverized coal preparation system.
The specific embodiment
Describe below in conjunction with the preferred embodiment of accompanying drawing, should be appreciated that preferred embodiment described herein only is used for explanation and explains the utility model, and be not used in qualification the utility model the utility model.
System embodiment
According to the utility model embodiment,, a kind of coordinated control system of double inlet and outlet coal mill pulverized coal preparation system is provided like Fig. 1-shown in Figure 8.
As shown in Figure 1; Present embodiment comprises the fuel main control unit; The fuel quantity that is connected with the fuel main control unit successively calculates unit and mill capacity wind air quantity convert fuel amount unit, and the mill hot blast adjustment doors unit that is connected with mill capacity wind air quantity convert fuel amount unit matching; Also comprise the fuel command control module, fuel command control module and fuel main control unit are connected; Also comprise mill capacity wind bypass wind unit, mill capacity wind bypass wind unit is connected with mill capacity wind air quantity convert fuel amount unit matching; Also comprise feeder feed flow setup unit, feeder feed flow setup unit calculates unit matching with fuel quantity and is connected; Also comprise the total blast volume measuring unit, the total blast volume measuring unit is connected with mill capacity wind air quantity convert fuel amount unit matching.
Wherein, the operation principle of above-mentioned fuel command control module, fuel main control unit, fuel quantity calculating unit, capacity wind air quantity convert fuel amount unit, coal pulverizer hot blast regulon and coal pulverizer capacity wind bypass wind unit is following:
The fuel command control module is used to accept the greatest amount of fuel restriction (guarantee coal-air ratio in allowed band, avoid the coal amount excessive, can not fully burn) that boiler master controller instructs and total blast volume is controlled to fuel and obtains fuel master control instruction through the little controller that selects;
The fuel main control unit is used for carrying out the PID computing with fuel master control instruction and revised fuel quantity, forms the fuel quantity instruction;
Fuel quantity calculates the unit, and the fuel quantity after being used for proofreading and correct with many coal pulverizers (like three coal pulverizers) and fuel flow sum are as total fuel quantity;
Capacity wind air quantity convert fuel amount unit is used for through two capacity wind aperture feedback signals instantaneous feeder coal-supplying amount being revised, and obtains the dynamic instantaneous coal amount correction value of coal pulverizer;
Coal pulverizer hot blast regulon is used for controlling wind main-piping pressure of coal pulverizer through coal pulverizer hot blast controllable register, guarantees that main-piping pressure keeps stable;
Coal pulverizer capacity wind bypass wind unit is used for controlling the coal pulverizer total blast volume through coal pulverizer capacity air door; Simultaneously, bypass air door control selects functional block to be implemented in air quantity adjustment separator outlet pressure when on the low side through height, avoids chute blockage; Accept the total blast volume instruction when air quantity is higher, guarantee the normal proportioning of coal-air ratio.
During practical implementation, in the coordinated control system of the double inlet and outlet coal mill pulverized coal preparation system of the foregoing description, the configuration figure of fuel command control module is referring to Fig. 2; The configuration figure of fuel main control unit is referring to Fig. 3; Fuel quantity calculates the configuration figure of unit referring to Fig. 4, and the configuration figure of mill capacity wind air quantity convert fuel amount unit is referring to Fig. 5, and the configuration figure of capacity wind bypass wind unit is referring to Fig. 6; The configuration figure of feeder feed flow setup unit is referring to Fig. 7, and the configuration figure of mill hot blast adjustment doors unit is referring to Fig. 8.
Adopt the coordinated control system of the double inlet and outlet coal mill pulverized coal preparation system of the foregoing description; Aspect the control of pulverizer capacity; Can be with former control mode through hot blast pitch control mill total blast volume; Change into control mode at present, guarantee that main-piping pressure keeps stable (referring to Fig. 8) through a wind main-piping pressure of coal pulverizer.In addition, coal-grinding capacity wind aperture is converted into fuel quantity (referring to Fig. 4), directly is used for pulverizer capacity control through fair curve; Simultaneously, bypass air door control selects functional block to be implemented in air quantity adjustment separator outlet pressure when on the low side through height, avoids chute blockage; Accept the total blast volume instruction when air quantity is higher, guarantee the normal proportioning of coal-air ratio (referring to Fig. 6 and Fig. 7).Thereby when unit load changes coal pulverizer exert oneself can be in time, change fast; Utilize total blast volume to measure replacement capacity wind air quantity simultaneously and participate in control, avoided owing to reasons such as space structure and measuring cell installation are brought a lot of interference problems to control.
Method embodiment
According to the utility model embodiment, a kind of control method for coordinating of double inlet and outlet coal mill pulverized coal preparation system is provided, comprising:
Aspect the control of pulverizer capacity, adopt mill hot blast adjustment doors unit to carry out the hot blast pitch, control mill main-piping pressure; And,
Adopt mill capacity wind air quantity convert fuel amount unit, coal-grinding capacity wind aperture is converted into fuel quantity, directly be used for pulverizer capacity control through fair curve;
Simultaneously, adopt mill capacity wind bypass wind unit, select functional block to be implemented in air quantity adjustment separator outlet pressure when on the low side, avoid chute blockage through height; Accept the total blast volume instruction when air quantity is higher, guarantee the normal proportioning of coal-air ratio; And,
Adopt the total blast volume measuring unit, when unit load changes coal pulverizer exert oneself can be in time, change fast.
The control method for coordinating of the double inlet and outlet coal mill pulverized coal preparation system of the foregoing description can be based on the coordinated control system of the double inlet and outlet coal mill pulverized coal preparation system of said system embodiment when specifically realizing; About the related description of the coordinated control system of double inlet and outlet coal mill pulverized coal preparation system, the related description referring to about Fig. 1-Fig. 8 repeats no more at this.
What should explain at last is: the above is merely the preferred embodiment of the utility model; Be not limited to the utility model; Although the utility model has been carried out detailed explanation with reference to previous embodiment; For a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (5)
1. the coordinated control system of a double inlet and outlet coal mill pulverized coal preparation system; It is characterized in that; Comprise the fuel main control unit; The fuel quantity that is connected with said fuel main control unit successively calculates unit and mill capacity wind air quantity convert fuel amount unit, and the mill hot blast adjustment doors unit that is connected with said mill capacity wind air quantity convert fuel amount unit matching.
2. the coordinated control system of double inlet and outlet coal mill pulverized coal preparation system according to claim 1 is characterized in that, also comprises the fuel command control module, and said fuel command control module and fuel main control unit are connected.
3. the coordinated control system of double inlet and outlet coal mill pulverized coal preparation system according to claim 1 and 2 is characterized in that, also comprises mill capacity wind bypass wind unit, and said mill capacity wind bypass wind unit is connected with mill capacity wind air quantity convert fuel amount unit matching.
4. the coordinated control system of double inlet and outlet coal mill pulverized coal preparation system according to claim 3 is characterized in that, also comprises feeder feed flow setup unit, and said feeder feed flow setup unit calculates unit matching with fuel quantity and is connected.
5. the coordinated control system of double inlet and outlet coal mill pulverized coal preparation system according to claim 4 is characterized in that, also comprises the total blast volume measuring unit, and said total blast volume measuring unit is connected with mill capacity wind air quantity convert fuel amount unit matching.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102600959A (en) * | 2012-04-05 | 2012-07-25 | 甘肃电力科学研究院 | Coordinated control system and coordinated control method for powder milling system of double-entering and double-leaving coal mill |
| CN103047670A (en) * | 2013-01-29 | 2013-04-17 | 福州福大自动化科技有限公司 | Direct blowing type double-inlet and double-outlet steel ball grinding energy conservation optimization system and method thereof |
| CN103672954A (en) * | 2013-12-30 | 2014-03-26 | 广东电网公司电力科学研究院 | Method, system and device for controlling capacity and air volume of coal mill |
| CN103721833A (en) * | 2013-12-30 | 2014-04-16 | 广东电网公司电力科学研究院 | Linkage control method, linkage control system and linkage control device for inlet air pressure and capacity air volume of coal mill |
| CN108325730A (en) * | 2018-04-13 | 2018-07-27 | 中国神华能源股份有限公司 | The method and apparatus for controlling pulverized coal preparation system |
| CN107812598B (en) * | 2017-10-31 | 2024-01-12 | 华润电力（贺州）有限公司 | Powder preparation control system of double-inlet and double-outlet coal mill |
-
2012
- 2012-04-05 CN CN2012201394774U patent/CN202538906U/en not_active Withdrawn - After Issue
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102600959A (en) * | 2012-04-05 | 2012-07-25 | 甘肃电力科学研究院 | Coordinated control system and coordinated control method for powder milling system of double-entering and double-leaving coal mill |
| CN103047670A (en) * | 2013-01-29 | 2013-04-17 | 福州福大自动化科技有限公司 | Direct blowing type double-inlet and double-outlet steel ball grinding energy conservation optimization system and method thereof |
| CN103047670B (en) * | 2013-01-29 | 2015-06-17 | 福州福大自动化科技有限公司 | Direct blowing type double-inlet and double-outlet steel ball grinding energy conservation optimization system and method thereof |
| CN103672954A (en) * | 2013-12-30 | 2014-03-26 | 广东电网公司电力科学研究院 | Method, system and device for controlling capacity and air volume of coal mill |
| CN103721833A (en) * | 2013-12-30 | 2014-04-16 | 广东电网公司电力科学研究院 | Linkage control method, linkage control system and linkage control device for inlet air pressure and capacity air volume of coal mill |
| CN103672954B (en) * | 2013-12-30 | 2015-10-21 | 广东电网公司电力科学研究院 | Coal pulverizer capacity air quantity control method, system and its apparatus |
| CN103721833B (en) * | 2013-12-30 | 2016-05-11 | 广东电网公司电力科学研究院 | Coal pulverizer inlet blast and capacity air quantity inter-linked controlling method, system and device |
| CN107812598B (en) * | 2017-10-31 | 2024-01-12 | 华润电力（贺州）有限公司 | Powder preparation control system of double-inlet and double-outlet coal mill |
| CN108325730A (en) * | 2018-04-13 | 2018-07-27 | 中国神华能源股份有限公司 | The method and apparatus for controlling pulverized coal preparation system |
| CN108325730B (en) * | 2018-04-13 | 2020-02-14 | 中国神华能源股份有限公司 | Method and device for controlling pulverizing system |
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