CN117249429A - Primary air pressure control strategy suitable for Xinjiang high alkali coal unit for combustion - Google Patents
Primary air pressure control strategy suitable for Xinjiang high alkali coal unit for combustion Download PDFInfo
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- CN117249429A CN117249429A CN202311410219.4A CN202311410219A CN117249429A CN 117249429 A CN117249429 A CN 117249429A CN 202311410219 A CN202311410219 A CN 202311410219A CN 117249429 A CN117249429 A CN 117249429A
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- control module
- coal
- air pressure
- primary
- primary air
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- 239000003245 coal Substances 0.000 title claims abstract description 93
- 238000011217 control strategy Methods 0.000 title claims abstract description 12
- 239000003513 alkali Substances 0.000 title claims abstract description 6
- 238000002485 combustion reaction Methods 0.000 title abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000446 fuel Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000010248 power generation Methods 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract 1
- 230000004044 response Effects 0.000 description 4
- 238000004939 coking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/008—Flow control devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention relates to a primary air pressure control strategy and a primary air pressure control method suitable for a Xinjiang high alkali coal unit for combustion, and belongs to the technical field of thermal power generation. Comprises a Distributed Control System (DCS), a coal supply control module, a hot air baffle control module and a wind pressure control module. The primary air pressure set value is calculated by adopting the maximum coal feeding value of the coal mill, so that the control stability of the primary air pressure under the conditions of starting and stopping coal grinding and coal breaking is realized, and the operation safety and stability of the unit are greatly improved. And meanwhile, the primary air pressure is corrected through an opening command of the hot air baffle at the inlet of the coal mill, when the opening is smaller, the primary air pressure is reduced through correction, the hot air baffle at the inlet of the coal mill is opened, the electricity consumption of the primary fan is reduced through throttling, and the economical operation of the primary fan is realized. The primary air pressure control method provided by the invention realizes the operation economy of primary air pressure on the basis of ensuring the safe and stable operation of the unit while ensuring the powder feeding reliability.
Description
Technical Field
The invention relates to a primary air pressure control strategy suitable for a high-alkali coal-fired unit, which realizes automatic control of primary air pressure under different loads through a new control strategy and belongs to the technical field of thermal power generation.
Background
The primary air is air which is fed into the hearth along with the pulverized coal from a pulverized coal pipeline when the pulverized coal furnace burns, and is mainly used for carrying the pulverized coal. In addition, primary air dominates the combustion of boiler coal fines. The primary air carries the pulverized coal into the hearth together, and the quantity of air required for the pulverized coal combustion to complete the preheating and combustion stages is basically the most important part of the total actual air quantity required to be added during quantitative fuel combustion. When the load of the pulverized coal is changed, the coal feeding amount is changed, and the corresponding primary air pressure is also changed. The conventional control scheme is generally: the set value of the primary air pressure follows the boiler instruction, so that the synchronous change of the primary air and fuel and the enhancement of the combustion responsiveness of the pulverized coal airflow can be ensured, but the primary air pressure is greatly changed when the coal mill is started and stopped, so that the combustion stability is not facilitated; even because the coal feeding amount of each coal mill is provided with inconsistent offset values in actual operation, the problem of blocking and grinding of the coal mill with larger coal feeding amount can occur, and the safe and stable operation of the unit is greatly influenced; for the Xinjiang coal unit, the primary air pressure setting is easy to be larger, the opening of the hot air baffle is smaller, and the throttling loss is large, so that the system air leakage rate and the air channel resistance are increased, the power consumption of the primary air blower is increased, and the power consumption of the primary air blower is identical with the actual running condition of a Xinning power plant. On the other hand, the primary air pressure causes the rigidity of the pulverized coal airflow to be higher, the rigidity of the primary air pulverized coal airflow is higher, the tangential circle is bigger, the flame spreads to the periphery, and the water-cooled wall is coked.
Therefore, the technical field needs to optimally control the primary air pressure, which is a parameter affecting the coking and combustion response of the boiler, aiming at the operation characteristics of the Xinjiang coal unit for combustion, so that the quick response and economy are realized while the safe and stable operation of a heating surface is ensured.
Disclosure of Invention
According to the invention, aiming at the operation characteristics of the Xinjiang coal unit, the parameter of primary air pressure, which influences the coking and combustion response of the boiler, is optimally controlled, so that the safe and stable operation of a heating surface is ensured, and the quick response and the economical efficiency are realized.
In order to solve the above problems, the present invention provides a primary wind pressure control strategy, which is characterized in that: the system comprises a Distributed Control System (DCS), a coal supply control module, a hot air baffle control module and a primary air pressure control module; the coal feeding control module transmits a coal feeding instruction to a Distributed Control System (DCS); a Distributed Control System (DCS) performs data processing on a plurality of coal feeding command values transmitted by a coal feeding control module, and calculates a primary wind pressure setting initial value according to the coal feeding command values; the hot air baffle control module transmits the hot air baffle opening data to a Distributed Control System (DCS), and the Distributed Control System (DCS) carries out data processing on the hot air baffle opening data transmitted by the hot air baffle control module, corrects and calculates a primary air pressure setting initial value according to a coal feeding instruction value and gives a final primary air pressure setting value; a Distributed Control System (DCS) transmits a final primary wind pressure set value to a wind pressure control module; the wind pressure control module controls the primary wind pressure according to the final primary wind pressure set value.
The control strategy is that the primary wind pressure setting follows the maximum coal feeding amount, the opening correction of the hot air baffle plate and the overshoot correction of the variable load fuel.
The invention also provides a primary wind pressure control method, which is characterized by comprising the following steps:
step 1: the coal feed control module transmits coal feed instructions executed by the plurality of coal mills to a Distributed Control System (DCS).
And 2, performing data processing on a plurality of coal feeding command values transmitted by the coal feeding control module by a Distributed Control System (DCS), taking a maximum coal feeding command value, and calculating a primary wind pressure setting initial value according to the maximum coal feeding command value.
And 3, transmitting the opening data of the hot air baffle to a Distributed Control System (DCS) by the hot air baffle control module.
Step 4, performing data processing on the hot air baffle opening data transmitted by the hot air baffle control module by a Distributed Control System (DCS), and correcting and calculating a primary wind pressure setting initial value according to a coal feeding instruction value when all the hot air baffle opening data are smaller than 80% of a standard value;
and 5, considering the influence of the variable load fuel overshoot on the primary air pressure, analyzing the load lifting data by a Distributed Control System (DCS), adjusting the primary air pressure according to the variable load fuel overshoot, and giving a final primary air pressure set value.
And 6, transmitting the final primary wind pressure set value to a wind pressure control module by a Distributed Control System (DCS).
And 7, adjusting the opening degree of the primary fan blade by the wind pressure control module according to the final primary wind pressure set value and the characteristic function, and finally realizing correction and optimization control of the primary wind pressure.
The invention aims to provide a primary wind pressure control strategy which is suitable for a Xinjiang coal-fired unit and comprehensively considers safety, responsiveness and economy, so that the purposes of improving the safe and stable operation of the unit, meeting the assessment requirements of automatic power generation control of a power grid and saving electricity are achieved. The primary air pressure setting follows the largest coal feeder instruction, and the aperture of the hot air baffle of the coal mill is adopted for correction. The method has the advantages that under the working conditions of coal cutting off, starting and stopping coal grinding and the like of the coal feeder, the primary air pressure setting cannot be greatly disturbed, and the primary air pressure fluctuation is reduced, so that the safe and stable operation is facilitated.
In order to reduce the primary fan current, the primary air pressure setting is corrected by adopting the opening degree of the hot air baffle at the inlet of the coal mill, and when the opening degree of the hot air baffle is less than 80 percent, the throttle effect of the primary air is considered to be reduced by reducing the primary air pressure (for example, when the opening degree is 50 percent, the correction amount reaches to-0.4 KPa at maximum) in a mode that the opening degree of the baffle is increased. At this time, the Distributed Control System (DCS) performs data processing on the hot air baffle opening data transmitted from the hot air baffle control module, corrects the primary air pressure setting initial value calculated from the coal feeding command value, and gives the final primary air pressure setting value. The final primary air pressure set value is transmitted to the air pressure control module by the Distributed Control System (DCS), so that the primary air pressure is reduced. Meanwhile, an operator operates the hot air baffle actuator mechanism to gradually increase the opening of the baffle, and the throttling effect of primary air is reduced on the premise of ensuring the air pressure, so that the electricity consumption of the primary air fan is reduced.
In order to reduce the coking risk in the dynamic load lifting process, the primary air pressure is corrected by adopting load-variable fuel overshoot.
According to the invention, the primary air pressure control strategy is optimized, so that the running economy of the primary air pressure is improved while the safe and stable running of the heating surface of the unit is ensured. Through reducing the throttle effect of coal pulverizer entry baffle, realize reducing primary wind pressure, and then reduce primary fan electric current, reduce primary fan power consumption.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, primary air pressure control optimization is performed, the coal feeding amount of the coal mill is introduced, the maximum coal feeding amount is obtained in actual operation, the control stability of primary air pressure under the conditions of starting, stopping grinding and breaking coal is realized, and the operation safety and stability of the unit are greatly improved.
2. According to the invention, through the opening instruction of the hot air baffle at the inlet of the coal mill, the primary air is throttled when the opening is smaller, the primary air pressure is reduced by correction, and meanwhile, the hot air baffle at the inlet of the coal mill is opened, so that the primary air pressure is reduced while the throttling is reduced, and the electricity consumption of the primary air fan is reduced, thereby realizing the economic operation of the primary air fan.
3. The invention considers the fuel overshoot in the variable load to correct the primary air pressure, and the primary air pressure set value is more close to the actual requirement of the Xinjiang coal for combustion, thereby avoiding the phenomena of bigger tangential circle, flame diffusion to the periphery and the like.
Drawings
Fig. 1 is a schematic diagram of a primary wind pressure control strategy according to the present invention.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments accompanied with the accompanying drawings are described in detail as follows:
as shown in fig. 1, a primary air pressure control strategy suitable for a Xinjiang high alkali coal unit for combustion comprises a Distributed Control System (DCS) 1, a coal supply control module 2, a hot air baffle control module 3 and an air pressure control module 4; the coal feeding control module 2 transmits a coal feeding instruction to a Distributed Control System (DCS) 1; the Distributed Control System (DCS) 1 processes data of a plurality of coal feeding command values transmitted by the coal feeding control module 2, and calculates a primary wind pressure setting initial value according to the coal feeding command values; the hot air baffle control module 3 transmits the hot air baffle opening data to the Distributed Control System (DCS) 1, the Distributed Control System (DCS) 1 carries out data processing on the hot air baffle opening data transmitted by the hot air baffle control module 3, corrects and calculates a primary air pressure setting initial value according to a coal feeding instruction value, and gives a final primary air pressure setting value; the Distributed Control System (DCS) 1 transmits the final primary wind pressure set value to the wind pressure control module 4; the wind pressure control module 4 controls the primary wind pressure according to the final primary wind pressure set value.
A primary wind pressure control method comprises the following steps:
step 1: the coal feed control module 2 transmits a coal feed instruction executed by a plurality of coal mills to a Distributed Control System (DCS) 1.
And 2, performing data processing on a plurality of coal feeding command values transmitted by the coal feeding control module 2 by using a Distributed Control System (DCS) 1, taking a maximum coal feeding command value, and calculating a primary wind pressure setting initial value according to the maximum coal feeding command value.
And 3, transmitting the opening data of the hot air baffle to a Distributed Control System (DCS) 1 by the hot air baffle control module 3.
Step 4, performing data processing on the hot air baffle opening data transmitted by the hot air baffle control module by a Distributed Control System (DCS), and correcting and calculating a primary wind pressure setting initial value according to a coal feeding instruction value when all the hot air baffle opening data are smaller than 80% of a standard value;
and 5, considering the influence of the variable load fuel overshoot on the primary air pressure, analyzing the load lifting data by a Distributed Control System (DCS), adjusting the primary air pressure according to the variable load fuel overshoot, and giving a final primary air pressure set value.
And 6, transmitting the final primary wind pressure set value to the wind pressure control module 4 by the Distributed Control System (DCS) 1.
And 7, controlling the primary air pressure by the air pressure control module 4 according to the final primary air pressure set value.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.
Claims (2)
1. A primary wind pressure control strategy suitable for a Xinjiang high alkali coal unit is characterized in that: comprises a Distributed Control System (DCS) (1), a coal feeding control module (2), a hot air baffle control module (3) and a wind pressure control module (4); the coal feeding control module (2) transmits a coal feeding instruction to the Distributed Control System (DCS) (1); a Distributed Control System (DCS) (1) performs data processing on a plurality of coal feeding command values transmitted by a coal feeding control module (2), and calculates a primary wind pressure setting initial value according to the coal feeding command values; the hot air baffle control module (3) transmits the hot air baffle opening data to the Distributed Control System (DCS) (1), the Distributed Control System (DCS) (1) carries out data processing on the hot air baffle opening data transmitted by the hot air baffle control module (3), corrects and calculates a primary air pressure setting initial value according to a coal feeding instruction value, and gives a final primary air pressure setting value; the Distributed Control System (DCS) (1) transmits the final primary wind pressure set value to the wind pressure control module (4); the wind pressure control module (4) controls the primary wind pressure according to the final primary wind pressure set value.
2. A primary wind pressure control method is characterized by comprising the following steps:
step 1: the coal feeding control module (2) transmits coal feeding instructions executed by a plurality of coal mills to the Distributed Control System (DCS) (1);
step 2, a Distributed Control System (DCS) (1) processes data of a plurality of coal feeding command values transmitted by a coal feeding control module (2), takes a maximum coal feeding command value, and calculates a primary wind pressure setting initial value according to the maximum coal feeding command value;
step 3, the hot air baffle control module (3) transmits the opening data of the hot air baffle to a Distributed Control System (DCS) (1);
step 4, performing data processing on the hot air baffle opening data transmitted by the hot air baffle control module by a Distributed Control System (DCS), and correcting and calculating a primary wind pressure setting initial value according to a coal feeding instruction value when all the hot air baffle opening data are smaller than 80% of a standard value;
step 5, analyzing the load lifting data by a Distributed Control System (DCS), adjusting primary air pressure according to the variable load fuel overshoot, and giving a final primary air pressure set value;
and 6, controlling the primary air pressure by the air pressure control module (4) according to the final primary air pressure set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311410219.4A CN117249429A (en) | 2023-10-27 | 2023-10-27 | Primary air pressure control strategy suitable for Xinjiang high alkali coal unit for combustion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311410219.4A CN117249429A (en) | 2023-10-27 | 2023-10-27 | Primary air pressure control strategy suitable for Xinjiang high alkali coal unit for combustion |
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| Publication Number | Publication Date |
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| CN117249429A true CN117249429A (en) | 2023-12-19 |
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| CN202311410219.4A Pending CN117249429A (en) | 2023-10-27 | 2023-10-27 | Primary air pressure control strategy suitable for Xinjiang high alkali coal unit for combustion |
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| CN (1) | CN117249429A (en) |
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- 2023-10-27 CN CN202311410219.4A patent/CN117249429A/en active Pending
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