CN113534769B - Fault optimization control method and system for coal pulverizing system of pure pneumatic draught fan coal-fired unit - Google Patents
Fault optimization control method and system for coal pulverizing system of pure pneumatic draught fan coal-fired unit Download PDFInfo
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- CN113534769B CN113534769B CN202110602171.1A CN202110602171A CN113534769B CN 113534769 B CN113534769 B CN 113534769B CN 202110602171 A CN202110602171 A CN 202110602171A CN 113534769 B CN113534769 B CN 113534769B
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- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
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- G—PHYSICS
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Abstract
The invention discloses a fault optimization control method for a coal pulverizing system of a pure pneumatic draught fan coal-fired unit, which comprises the following steps: increasing the signal of a self-throwing interlocking switching switch of a loaded fuel gun; judging whether the powder making systems operate or not, and acquiring the number of the operated powder making systems; when the automatic switching interlocking switching switch of the low-load fuel gun is switched on and the number of the operated powder making systems is from 4 or more to less than 4, triggering automatic switching tiny-oil air distribution preparation instruction to be output; when the low-load fuel gun automatic switching interlocking switch is switched on and the number of the operated powder making systems is from 3 or more to less than 3, triggering the automatic switching fuel gun to output an instruction. Through thermal logic optimization, when the interlocking is put into operation and the number of layers of the operating pulverized coal burner is from 4 or more to less than 4, triggering self-throwing tiny-oil air distribution preparation instruction to output; when the interlocking is put into use and the number of layers of the running pulverized coal burner is from 3 or more to less than 3, the instruction output of the automatic oil-throwing gun is triggered, the combustion supporting of the fuel oil in DCS interlocking operation is realized, and the effect of stabilizing the load is achieved.
Description
Technical Field
The invention belongs to the technical field of coal-fired unit pulverizing system control, and particularly relates to a 660MW pure steam-driven induced draft fan coal-fired unit pulverizing system fault tripping optimization control method and system.
Background
Thermal power generation is a general term for generating electricity by heating water by using heat energy generated when fuel such as coal is combusted, so that the water is changed into high-temperature and high-pressure steam, and then driving a generator by the steam; the thermal generator set mainly comprises a boiler, a steam turbine, a generator, a coal mill, a primary fan, a blower, an induced draft fan, a DCS control system and other equipment; the basic flow of thermal power generation is that fuel is fed into a boiler, air is fed into the boiler, chemically treated feed water is injected into the boiler, heat energy released by fuel combustion is utilized to change water into high-temperature and high-pressure steam, and a steam turbine is driven to rotate to apply work to drive a generator to generate electricity; the coal pulverizer (pulverizing system) grinds the coal blocks into coal powder, improves the combustion efficiency of the boiler, provides primary air with certain pressure and certain flow rate by a primary fan, dries the coal powder and sends the coal powder into the boiler for combustion; the air feeder sends air into the boiler to provide oxygen required by pulverized coal combustion; the draught fan extracts smoke generated by burning the pulverized coal in the hearth and keeps micro-negative pressure operation in the boiler; the feed water is heated into steam by the heat generated by the combustion of the pulverized coal, and the steam is sent to the steam turbine to drive the steam turbine to rotate and do work to drive the generator to generate electricity.
Because No. 3, 4 units (660 MW pure steam-driven draught fan coal-fired unit) are when three mills are operated, if take place when powder process system fault tripping operation, can have the following risk:
1. the combustion of the unit is unstable;
2. the load of the unit is reduced too much, the steam source of a steam turbine of the suction fan is insufficient, the negative pressure of a boiler hearth cannot guarantee abnormal conditions, and the shutdown risk is caused.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a fault optimization control method and a fault optimization control system for a coal-fired unit pulverizing system of a pure pneumatic induced draft fan, wherein through thermal logic optimization, when interlocking is put into use and the number of layers of an operating coal-fired burner is from 4 or more to less than 4, an automatic-switching tiny-oil air distribution preparation instruction is triggered to be output; when the interlocking is put into use and the number of layers of the running pulverized coal burner is from 3 or more to less than 3, the instruction output of the automatic oil-throwing gun is triggered, the combustion supporting of the fuel oil in DCS interlocking operation is realized, and the effect of stabilizing the load is achieved.
The technical scheme of the invention is as follows:
a pure pneumatic draught fan coal-fired unit pulverizing system fault optimization control method comprises the following steps:
s01: increasing the signal of a self-throwing interlocking switching switch of a loaded fuel gun;
s02: judging whether the pulverizing systems operate or not, and acquiring the number of the operating pulverizing systems;
s03: when a low-load fuel gun automatic switching interlocking switch is switched on and the number of the operated powder making systems is from 4 or more to less than 4, triggering automatic switching tiny-oil air distribution preparation instruction to output;
s04: when the low-load fuel gun automatic switching interlocking switch is switched on and the number of the operated powder making systems is from 3 or more to less than 3, triggering the automatic switching fuel gun to output an instruction.
In a preferred technical solution, the method for determining whether the pulverizing system is operating in step S02 includes: when the coal mill has closing feedback and the coal feeder has an operation signal and the coal feeder operation coal amount is more than 10t/h and exceeds a certain time, judging that the coal pulverizing system operates; otherwise, judging the fault of the pulverizing system.
In a preferred technical solution, the triggering of the self-priming tiny-oil air distribution preparation instruction output in step S03 includes: setting the frequency of an interlocking oil distribution fan to 90%, setting the opening of an air film air adjusting door of a tiny oil gun to 35% by interlocking, and throwing the tiny oil gun to distribute air to prepare acousto-optic alarm; reset after a certain time.
In a preferred technical solution, the triggering of the instruction output of the auto-throwing oil gun in step S04 includes: the AB layer oil gun is started in a program-controlled manner, a CD layer oil gun is started in a program-controlled manner after a certain time delay, and a low-load fuel oil gun automatically throws an audible and visual alarm; resetting after a certain time.
The invention also discloses a pure pneumatic draught fan coal-fired unit pulverizing system fault optimization control system, which comprises:
the interlocking switching switch is used for increasing the signal of the self-switching interlocking switching switch of the loaded fuel gun;
the operation judging module of the powder process system judges whether the powder process system operates or not and obtains the number of the operated powder process systems;
the automatic-delivery tiny-oil air distribution preparation instruction output module triggers the automatic-delivery tiny-oil air distribution preparation instruction to be output when the automatic-delivery interlocking switching switch of the low-load fuel gun is put into operation and the number of the operated powder making systems is from 4 or more to less than 4;
and the automatic oil gun throwing instruction output module triggers automatic oil gun throwing instruction output when the low-load oil gun automatic interlocking switching switch is put into operation and the number of the operated powder making systems is from 3 or more to less than 3.
In an optimal technical scheme, the method for judging whether the powder process system operates in the powder process system operation judging module comprises the following steps: when the coal mill has closing feedback and the coal feeder has an operation signal and the coal feeder operation coal amount is more than 10t/h and exceeds a certain time, judging that the coal pulverizing system operates; otherwise, the fault of the pulverizing system is judged.
In a preferred technical scheme, triggering the output of the self-feeding tiny-oil wind distribution preparation instruction in the self-feeding tiny-oil wind distribution preparation instruction output module comprises: setting the frequency of an interlocking oil distribution fan to 90%, setting the opening of an air film air adjusting door of a tiny oil gun to 35% by interlocking, and throwing the tiny oil gun to distribute air to prepare acousto-optic alarm; reset after a certain time.
In a preferred technical scheme, triggering the instruction output of the auto-throwing oil gun in the auto-throwing oil gun instruction output module comprises: the AB layer oil gun is started in a program-controlled manner, a CD layer oil gun is started in a program-controlled manner after a certain time delay, and a low-load fuel oil gun automatically throws an audible and visual alarm; reset after a certain time.
Compared with the prior art, the invention has the beneficial effects that:
through thermal logic optimization, when the number of layers of the operating pulverized coal burner is interlocked and put in, from 4 to more than 4 to less than 4, the self-throwing tiny-oil air distribution preparation instruction is triggered to be output, and when the number of layers of the operating pulverized coal burner is interlocked and put in, from 3 to more than 3, the self-throwing oil gun instruction is triggered to be output, so that the combustion supporting of the DCS interlocked operation fuel is realized, and the effect of stabilizing the load is achieved. Because the oil gun automatic switching logic is adopted, unstable combustion of the unit under low load due to accidents is avoided; the load of the unit is prevented from being reduced too much, the steam source of a suction fan steam turbine is insufficient, abnormal conditions of negative pressure of a boiler furnace chamber cannot be guaranteed, the pressure of accident handling personnel is reduced, precious time is strived for accident handling, and the risk of shutdown is avoided.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a flow chart of a fault optimization control method for a coal pulverizing system of a pure pneumatic induced draft fan coal-fired unit according to the invention;
FIG. 2 is a logic diagram of the low-load interlocking fuel injection and stabilization of the invention;
FIG. 3 is a schematic block diagram of a fault optimization control system of a coal pulverizing system of the pure pneumatic induced draft fan coal-fired unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Examples
As shown in fig. 1, a pure pneumatic induced draft fan coal-fired unit pulverizing system fault optimization control method includes the following steps:
s01: increasing the signal of a self-throwing interlocking switch of a load fuel gun;
s02: judging whether the powder making systems operate or not, and acquiring the number of the operated powder making systems;
s03: when the automatic switching interlocking switching switch of the low-load fuel gun is switched on and the number of the operated powder making systems is from 4 or more to less than 4, triggering automatic switching tiny-oil air distribution preparation instruction to be output;
s04: when the low-load fuel gun automatic switching interlocking switch is switched on and the number of the operated powder making systems is from 3 or more to less than 3, triggering the automatic switching fuel gun to output an instruction.
The logic diagram of the low-load interlocking oil-throwing and stable-burning is shown in figure 2, a signal of a switching button KEY BORAD of the load fuel gun is added, the switching button KEY BORAD is connected with a switching switch of the load fuel gun automatic-throwing interlocking through a synchronous rectifier SR, and the switching switch of the load fuel gun automatic-throwing interlocking is connected to the input ends of an automatic-throwing tiny-oil air distribution preparation instruction and an automatic-throwing fuel gun instruction.
In a preferred embodiment, the method for determining whether the powder process system is running in step S02 includes: when the coal mill has closing feedback and the coal feeder has an operation signal and the coal feeder operation coal amount is more than 10t/h and exceeds a certain time, judging that the coal pulverizing system operates; otherwise, judging the fault of the pulverizing system.
In a preferred embodiment, the triggering of the self-priming micro-oil air distribution preparation instruction output in step S03 includes: setting the frequency of an interlocking oil distribution fan to 90%, setting the opening of an air film air adjusting door of a micro oil gun to 35% by interlocking, and throwing the micro oil gun to distribute air to prepare acousto-optic alarm; resetting after a certain time.
In a preferred embodiment, the step S04 of triggering the output of the auto-priming gun command includes: the AB layer oil gun is started in a program-controlled manner, a CD layer oil gun is started in a program-controlled manner after a certain time delay, and a low-load fuel oil gun automatically throws an audible and visual alarm; resetting after a certain time.
As shown in fig. 3, the invention also discloses a pure pneumatic draught fan coal-fired unit coal pulverizing system fault optimization control system, which comprises:
the interlocking throw-cut switch is used for increasing the signal of the self-throw interlocking throw-cut switch of the loaded fuel gun; the switching button KEY BORAD is connected with a load fuel gun self-switching interlocking switching switch through a synchronous rectifier SR, and the load fuel gun self-switching interlocking switching switch is connected to the input ends of a self-switching tiny-oil air distribution preparation instruction and a self-switching oil gun instruction.
The operation judging module of the powder process system judges whether the powder process system operates or not and obtains the number of the operated powder process systems;
the automatic-delivery tiny-oil air distribution preparation instruction output module triggers the automatic-delivery tiny-oil air distribution preparation instruction to be output when the automatic-delivery interlocking switching switch of the low-load fuel gun is put into operation and the number of the operated powder making systems is from 4 or more to less than 4;
and the automatic oil gun throwing instruction output module triggers automatic oil gun throwing instruction output when the low-load oil gun automatic interlocking switching switch is put into operation and the number of the operated powder making systems is from 3 or more to less than 3.
In a preferred embodiment, the method for determining whether the powder process system is operating in the powder process system operation determining module includes: when the coal mill has closing feedback and the coal feeder has an operation signal and the coal feeder operation coal amount is more than 10t/h and exceeds a certain time, judging that the coal pulverizing system operates; otherwise, judging the fault of the pulverizing system.
In a preferred embodiment, the triggering of the output of the self-priming micro-oil wind distribution preparation command in the self-priming micro-oil wind distribution preparation command output module includes: setting the frequency of an interlocking oil distribution fan to 90%, setting the opening of an air film air adjusting door of a tiny oil gun to 35% by interlocking, and throwing the tiny oil gun to distribute air to prepare acousto-optic alarm; resetting after a certain time.
In a preferred embodiment, the triggering of the auto-throwing power gun instruction output in the auto-throwing power gun instruction output module includes: the AB layer oil gun is started in a program-controlled manner, a CD layer oil gun is started in a program-controlled manner after a certain time delay, and a low-load fuel oil gun automatically throws an audible and visual alarm; reset after a certain time.
The following is further illustrated by specific examples:
a 'low-load fuel gun automatic switching on/off' interlocking switching switch is added to a picture of a powder making system of a DCS (distributed control system) system of a No. 3 unit or a No. 4 unit (660 MW pure steam-driven draught fan coal-fired unit), and the following conditions are met:
when the interlocking switch of 'low-load fuel gun self-throwing/withdrawing' is thrown:
1. when any four layers of pulverized coal burners operate (the 4 th pulverizing system is reset after being put into service for 5 minutes and is determined according to the empirical value of the putting-in time of the pulverizing system), any pulverizing system is stopped:
1. throwing a tiny-oil gun to distribute air to prepare acousto-optic alarm;
2. the frequency set values of the interlocking oil distribution fans 1, 2, 3 and 4 are increased (determined according to the wind speed of 8 meters);
3. interlocking opens the 1#, 2#, 3#, 4# tiny oil gun air film wind adjusting door opening to 35%.
Namely, when the interlocking is put into operation, the number of layers of the running pulverized coal burner is from 4 to less than 4, the 'tiny-oil-gun air distribution preparation' is started, and the device is reset after 30 seconds (the device is determined according to the tiny-oil-gun air distribution preparation completion time, and the air distribution amount can be manually adjusted after 30 seconds).
2. When any three layers of pulverized coal burners operate (the 3 rd pulverizing system is reset after being put into service for 5 minutes and is determined according to the empirical value of the putting-in time of the pulverizing system), any pulverizing system is stopped:
1. the light and sound alarm is given to the low-load fuel gun during automatic operation;
and 2, starting the oil gun on the AB layer, and starting the oil gun on the CD layer after 20S intervals (program-controlled starting).
Namely, when the interlocking is put into operation, the 'low-load fuel gun automatic throwing' is started when the number of layers of the operating pulverized coal burner is from 3 or more to less than 3, and the operating pulverized coal burner is reset after 100 seconds (determined according to the starting and putting time of all the AB layer oil guns and the CD layer oil guns, and the oil guns can be manually thrown and withdrawn after 100 seconds).
Wherein FIG. 2 illustrates the following:
1. when the following conditions are all met, the logic judges that the output pulverizing system is put into service:
the coal mill has closing feedback;
the coal feeder has an operation signal;
the coal feeder running coal amount monitor is more than or equal to 10t/h, TD ON is delayed for 3S (the coal feeder running coal amount is more than 3S and more than or equal to 10 t/h).
2. Inputting the input signals of the six pulverizing systems into a DIG COUNT digital counter, and outputting the number of the operating pulverizing systems after judgment.
3. When the following conditions are met, logic judgment triggers the output of a self-throwing tiny-oil air distribution preparation instruction:
the running high value monitors of the pulverizing system are more than or equal to 4, and the condition that the time delay is 300S after TD OFF (the time delay for putting the 4 th pulverizing system reaches 300S) is not met;
the number of running low-value monitors of the pulverizing system is less than or equal to 3;
KEY boost interlock (switching button) has been engaged.
4. When the following conditions are met, the logic judgment triggers the output of the self-throwing oil gun instruction:
the running height of the pulverizing system is more than or equal to 3 monitors, and the condition of delaying 300S after TD OFF (the service of the 3 rd pulverizing system reaches 300S) is not met;
the number of running low-value monitors of the pulverizing system is less than or equal to 2;
KEY BORAD interlock has been entered.
5. Outputting a self-feeding tiny-oil air distribution preparation instruction, triggering the logic of the original equipment, and setting the frequency of an oil air distribution machine to 90%; setting the opening of an air film air adjusting door of the micro oil gun to 35 percent;
6. outputting an instruction of the automatic oil gun throwing, triggering the logic of the original equipment, and throwing the AB layer oil gun; the CD layer oil gun is thrown for 60 seconds.
Through the thermal logic optimization, the combustion supporting of the fuel oil in DCS interlocking operation is realized, and the effect of stabilizing the load is achieved. And precious time is provided for accident handling so as to recover the stable operation of the unit and ensure the production safety.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundary of the appended claims, or the equivalents of such scope and boundary.
Claims (6)
1. A pure pneumatic draught fan coal-fired unit pulverizing system fault optimization control method is characterized by comprising the following steps:
s01: increasing the signal of a self-throwing interlocking switch of a load fuel gun; the load fuel gun automatic switching interlocking switching switch is connected with a switching button through a synchronous rectifier SR, and the load fuel gun automatic switching interlocking switching switch is connected with the input ends of an automatic switching tiny-oil air distribution preparation instruction and an automatic switching oil gun instruction;
s02: judging whether the pulverizing systems operate or not, and acquiring the number of the operating pulverizing systems;
s03: when the automatic switching interlocking switching switch of the low-load fuel gun is switched on and the number of the operated powder making systems is from 4 or more to less than 4, triggering automatic switching tiny-oil air distribution preparation instruction to be output;
s04: when the automatic switching interlocking switch of the low-load fuel gun is switched on and the number of the operated powder making systems is from 3 or more to less than 3, triggering the automatic switching fuel gun to output a command, wherein the command comprises the programmed start of an AB layer fuel gun, the programmed start of a CD layer fuel gun after a certain time delay, and the automatic switching acousto-optic alarm of the low-load fuel gun; reset after a certain time.
2. The method for optimally controlling the faults of the coal pulverizing system of the pure pneumatic induced draft fan coal-fired unit according to claim 1, wherein the method for judging whether the coal pulverizing system operates in the step S02 comprises the following steps of: when the coal mill has closing feedback and the coal feeder has an operation signal and the coal feeder operation coal amount is more than 10t/h and exceeds a certain time, judging that the coal pulverizing system operates; otherwise, judging the fault of the pulverizing system.
3. The pure pneumatic induced draft fan coal-fired unit pulverizing system fault optimization control method of claim 1, wherein the triggering of the self-feeding tiny-oil air distribution preparation instruction output in the step S03 comprises: setting the frequency of an interlocking oil distribution fan to 90%, setting the opening of an air film air adjusting door of the micro oil gun to 35% through interlocking, and throwing the micro oil gun to distribute air to prepare acousto-optic alarm; reset after a certain time.
4. The utility model provides a pure pneumatics draught fan coal-fired unit pulverizing system fault optimization control system which characterized in that includes:
the interlocking switching switch is used for increasing the signal of the self-switching interlocking switching switch of the loaded fuel gun;
the operation judging module of the powder process system judges whether the powder process system operates or not and obtains the number of the operated powder process systems;
the automatic-delivery tiny-oil air distribution preparation instruction output module triggers the automatic-delivery tiny-oil air distribution preparation instruction to be output when the automatic-delivery interlocking switching switch of the low-load fuel gun is put into operation and the number of the operated powder making systems is from 4 or more to less than 4;
the automatic oil gun throwing instruction output module triggers automatic oil gun throwing instruction output when the automatic interlocking throw-cut switch of the low-load oil gun is thrown and the number of the operated powder making systems is from 3 or more to less than 3, wherein the automatic oil gun throwing instruction output module comprises AB layer oil gun program control starting, CD layer oil gun program control starting after a certain time delay, and low-load oil gun automatic throwing acousto-optic alarm; resetting after a certain time.
5. The pure pneumatic induced draft fan coal-fired unit coal pulverizing system fault optimization control system of claim 4, wherein the method for judging whether the coal pulverizing system is operated in the coal pulverizing system operation judgment module comprises the following steps: when the coal mill has closing feedback and the coal feeder has an operation signal and the coal feeder operation coal amount is more than 10t/h and exceeds a certain time, judging that the coal pulverizing system operates; otherwise, judging the fault of the pulverizing system.
6. The pure pneumatic induced draft fan coal-fired unit pulverizing system fault optimization control system of claim 4, wherein triggering the output of the self-throwing micro-oil air distribution preparation command in the self-throwing micro-oil air distribution preparation command output module comprises: setting the frequency of an interlocking oil distribution fan to 90%, setting the opening of an air film air adjusting door of a tiny oil gun to 35% through interlocking, and throwing the tiny oil gun to distribute air to prepare acousto-optic alarm; reset after a certain time.
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| CN102705826A (en) * | 2012-05-07 | 2012-10-03 | 深圳中兴新源环保股份有限公司 | Oil gun capable of combusting various fuel oil |
| CN103495488B (en) * | 2013-10-18 | 2015-03-11 | 南京钢铁股份有限公司 | Full automatic control method and system for blast furnace pulverizing systems |
| CN105157004B (en) * | 2015-08-19 | 2017-04-12 | 广东电网有限责任公司电力科学研究院 | Boiler starting method for preventing oxide skin generation of 1,000 MW octagonal tangent circle boiler and secondary combustion accident of tail flue |
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