CN105135405A - Induced draft fan RB control method of high-sodium lignite tower boiler unit - Google Patents
Induced draft fan RB control method of high-sodium lignite tower boiler unit Download PDFInfo
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- CN105135405A CN105135405A CN201510505458.7A CN201510505458A CN105135405A CN 105135405 A CN105135405 A CN 105135405A CN 201510505458 A CN201510505458 A CN 201510505458A CN 105135405 A CN105135405 A CN 105135405A
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Abstract
The invention discloses an induced draft fan RB control method of a high-sodium lignite tower boiler unit. After induced draft fan RB happens, a DCS is controlled in following manners that a) a unit control manner is switched to a TF manner, wherein master control of a boiler is switched into a manual manner; b) a main steam pressure set value firstly tracks actual main steam pressure, and then the RB sliding and pressing rate is changed into a target pressure value; c) air feeders on the same side are tripped, and the adjustable vane opening degrees of induced draft fans and air feeders which are not tripped on the opposite side are each increased at a certain rate on the basis of an original opening degree till a target value is achieved; d) upper layer coal mills are sequentially tripped, and finally four coal mills are reserved to operate; and a lower layer plasma burner is started to operate, and an upper layer plasma burner is started to operate after time is delayed by t2; and e) when a load reaches a target load, induced draft fan RB control automatically ends, or after unit main parameters are stable, an operating person manually confirms that induced draft fan RB control ends. The induced draft fan RB control method can improve RB control stability and safety.
Description
Technical field
The invention belongs to Control Engineering technical field.Relate to a kind of air-introduced machine RB control method of high sodium brown coal tower boiler unit.
Background technology
The heat energy that thermal power generation produces when referring to fuel combustions such as utilizing coal carrys out heating water, makes water become high temperature, high-pressure steam, and then the general name generated electricity by steam pushing generator; Thermal power generation unit mainly comprises the equipment such as boiler, steam turbine, generator, coal pulverizer, primary air fan, pressure fan, air-introduced machine, DCS control system; The basic procedure of thermal power generation first sends fuel to boiler, sends into air simultaneously, and boiler injects through chemically treated feedwater, and the heat energy utilizing fuel combustion to release makes water become high temperature, high steam, and driving steam turbine rotates work done and drive electrical generators generates electricity; Coal cinder is ground to form coal dust by coal pulverizer, is provided the First air of certain pressure, certain flow by primary air fan, and coal dust is dry and send into boiler combustion; Air is sent into boiler by pressure fan, provides the oxygen required for coal dust firing; The flue gas that coal dust firing in burner hearth produces by air-introduced machine is extracted out, and keeps boiler internal tiny structure to run; Feedwater is heated into water vapour by the heat that coal dust firing produces, and steam is sent to steam turbine, and driving steam turbine rotates work done and drive electrical generators generates electricity; The english abbreviation of DCS[dcs (DistributedControlSystem)] control system carries out adjustment, the control of automation to each production link of thermal power plant, to coordinate the operating mode of each several part, make whole thermal power plant safety, reasonable, economical operation.
Along with UHV transmission line puts into operation successively, each regional power grid contact is tight, and the raising of boiler of power plant unit parameter and capacity, has higher requirement to thermal technics level and unit operation stability.When RB refers to that unit major pant item fault trip causes the real power of unit to be restricted; for adaptation equipment is exerted oneself; unit load is reduced to still in the load desired value that operation subsidiary engine can bear by coordinated control system fast; thus unit is maintained a lower load point run with security and stability, avoid shutting down or the generation of device damage accident.This function of coordinated control system is called runback (RUNBACK), is called for short RB.Perfect RB control strategy should accomplish each subsystem of internal coordination, to guarantee the balance transition of operating condition; External coordination FSSS (Boiler Furnace Safeguard Supervisory System), DEH (digital electro-hydraulic control system), SCS (sequence control system) system, accomplish fast, reposefully load be reduced in unit output allowed band.In high sodium brown coal tower boiler unit running process, furnace pressure fluctuation is large.When air and flue system exists disturbance, especially when air-introduced machine or pressure fan fault trip, easily cause boiler combustion unstable, furnace pressure transfinites, and causes unit failure to shut down, and has a strong impact on unit operation security and operation of power networks stability.
Summary of the invention
The technical problem to be solved in the present invention is, for the defect of prior art, provides a kind of air-introduced machine RB control method of high sodium brown coal tower boiler unit.High sodium brown coal tower boiler unit uses the method, air-introduced machine RB can be solved when occurring, cause furnace pressure to transfinite the problem of even compressor emergency shutdown, improve stability and the security of unit operation.
Technical scheme of the present invention is,
An air-introduced machine RB control method for high sodium brown coal tower boiler unit, unit comprises boiler, steam turbine, generator, coal pulverizer, primary air fan, pressure fan, air-introduced machine, plasma burner, DCS control system; Pressure fan and air-introduced machine are configured with two respectively, are arranged in boiler both sides; Coal pulverizer comprises the N platform medium-speed pulverizer (pulverized coal channel of coal pulverizer is presented understructure and arranged in boiler) presented understructure and arrange; Plasma burner comprises the two-layer plasma burner in upper and lower structural configuration, and every layer comprises M plasma burner;
After air-introduced machine RB occurs, DCS control system carries out following control:
A): by unit allocation mode from AGC mode (AutomaticGenerationControl, Automatic Generation Control) or CCS (coordinated control mode) be switched to TF mode (control mode based on steam turbine is followed, by Steam Turhine Adjustment main steam pressure force value); Boiler master is switched to manual mode;
B): main steam pressure setting value first follows the tracks of actual main steam pressure, then change to target pressure value (the sliding pressure value that target load is corresponding adds that 0.3MPa's is biased) by RB sliding pressure speed; In RB control procedure, main steam pressure setting value is that the sliding pressure value that unit load is corresponding adds that 0.3MPa's is biased;
C): tripping operation homonymy pressure fan; Do not trip air-introduced machine and pressure fan of offside increases air-introduced machine movable vane aperture and pressure fan movable vane aperture, until desired value with given pace respectively on former aperture basis;
In air-introduced machine movable vane aperture and pressure fan movable vane aperture increase process, real-time monitoring hearth pressure, pressure fan electric current and air-introduced machine electric current; If furnace pressure >+500Pa, or pressure fan electric current overrate, then locking pressure fan movable vane increases; If furnace pressure <-500Pa, or air-introduced machine electric current overrate, then locking air-introduced machine movable vane increases;
After air-introduced machine movable vane aperture and pressure fan movable vane aperture reach desired value, recovery air-introduced machine movable vane (control furnace pressure) and pressure fan movable vane control (control air quantity) automatically;
When air-introduced machine RB occurs, the air inducing automatic control system in shielding DCS control system cuts greatly manual condition with the regulated variable in air-supply automatic control system and setting value deviation;
D): from the superiors' coal pulverizer, at interval of time t
1tripping operation one deck coal pulverizer, final 4 coal pulverizers retaining lower floor run;
Drop into lower floor's plasma burner to run, delay time t
2drop into upper strata plasma burner again to run;
E): when load reaches target load, air-introduced machine RB controls automatically to terminate, or unit major parameter stable after controlled to terminate by operations staff's manual confirmation air-introduced machine RB.
Further, c), air-introduced machine increases air-introduced machine movable vane aperture with the speed of 1.0%/s, and desired value is 90%; Pressure fan increases pressure fan movable vane aperture with the speed of 0.6%/s, and desired value is 83%.
Further, for 600MW level supercritical unit (comprising 600MW, 635MW, 660MW), described RB sliding pressure speed is 1.2MPa/min.
Further, for 660MW supercritical unit, unit load---the corresponding relation of sliding pressure value is as shown in table 1:
Table 1 unit load---sliding pressure value correspondence table
Further, described target load is 50% unit rated load.
Further, described time t
1=10s, time t
2=15s.
Further, N=6, M=4.
Further, described furnace pressure adopts pressure transmitter measurement, and pressure fan and air-introduced machine electric current adopt current transducer to measure.
Technological core of the present invention is: after air-introduced machine RB occurs, intertripping homonymy pressure fan; The air-introduced machine that offside does not trip and pressure fan, exert oneself according to the actual of blower fan, air-introduced machine movable vane aperture and pressure fan movable vane aperture is increased with given pace respectively on former movable vane aperture basis, roughly balance to keep air-supply, air inducing in burner hearth, maintain furnace pressure in controlled range, stablize boiler combustion; Solve high sodium brown coal tower boiler unit furnace gun pressure fluctuation large, when air-introduced machine RB occurs, easily cause the problem of unit tripping; Avoid and cause unit failure to shut down, improve stability and the security of unit operation, reduce unit non-programmed halt number of times.
Beneficial effect:
1), solve air-introduced machine RB when occurring, furnace pressure fluctuation is large, even exceedes the problem that safety value causes unit disorderly closedown, improves stability and the security of unit operation.
2), by the engineering software in DCS control system calculate, do not need to increase investment.
3), be applicable to various thermal power generation unit DCS control system, configuration is convenient.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in more detail.
The invention discloses a kind of air-introduced machine RB control method of high sodium brown coal tower boiler unit, unit comprises boiler, steam turbine, generator, coal pulverizer, primary air fan, pressure fan, air-introduced machine, plasma burner, DCS control system; Pressure fan and air-introduced machine are configured with two respectively, are arranged in boiler both sides; Coal pulverizer comprises the N platform medium-speed pulverizer (pulverized coal channel of coal pulverizer is presented understructure and arranged in boiler) presented understructure and arrange; Plasma burner comprises the two-layer plasma burner in upper and lower structural configuration, and every layer comprises M plasma burner;
After air-introduced machine RB occurs, DCS control system carries out following control:
A): by unit allocation mode from AGC mode (AutomaticGenerationControl, Automatic Generation Control) or CCS (coordinated control mode) be switched to TF mode (control mode based on steam turbine is followed, by Steam Turhine Adjustment main steam pressure force value); Boiler master is switched to manual mode;
B): main steam pressure setting value first follows the tracks of actual main steam pressure, then change to target pressure value (the sliding pressure value that target load is corresponding adds that 0.3MPa's is biased) by RB sliding pressure speed; In RB control procedure, main steam pressure setting value is that the sliding pressure value that unit load is corresponding adds that 0.3MPa's is biased;
C): tripping operation homonymy pressure fan; Do not trip air-introduced machine and pressure fan of offside increases air-introduced machine movable vane aperture and pressure fan movable vane aperture, until desired value with given pace respectively on former aperture basis;
In air-introduced machine movable vane aperture and pressure fan movable vane aperture increase process, real-time monitoring hearth pressure, pressure fan electric current and air-introduced machine electric current; If furnace pressure >+500Pa, or pressure fan electric current overrate, then locking pressure fan movable vane increases; If furnace pressure <-500Pa, or air-introduced machine electric current overrate, then locking air-introduced machine movable vane increases;
After air-introduced machine movable vane aperture and pressure fan movable vane aperture reach desired value, recovery air-introduced machine movable vane (control furnace pressure) and pressure fan movable vane control (control air quantity) automatically;
When air-introduced machine RB occurs, the air inducing automatic control system in shielding DCS control system cuts greatly manual condition with the regulated variable in air-supply automatic control system and setting value deviation;
D): from the superiors' coal pulverizer, at interval of time t
1tripping operation one deck coal pulverizer, final 4 coal pulverizers retaining lower floor run;
Drop into lower floor's plasma burner to run, delay time t
2drop into upper strata plasma burner again to run;
E): when load reaches target load, air-introduced machine RB controls automatically to terminate, or unit major parameter stable after controlled to terminate by operations staff's manual confirmation air-introduced machine RB.
Further, c), air-introduced machine increases air-introduced machine movable vane aperture with the speed of 1.0%/s, and desired value is 90%; Pressure fan increases pressure fan movable vane aperture with the speed of 0.6%/s, and desired value is 83%.
Further, for 600MW level supercritical unit (comprising 600MW, 635MW, 660MW), described RB sliding pressure speed is 1.2MPa/min.
Further, for 660MW supercritical unit, unit load---the corresponding relation of sliding pressure value is as shown in table 1:
Table 1 unit load---sliding pressure value correspondence table
Further, described target load is 50% unit rated load.
Further, described time t
1=10s, time t
2=15s.
Further, N=6, M=4.
Further, described furnace pressure adopts pressure transmitter measurement, and pressure fan and air-introduced machine electric current adopt current transducer to measure.
The present invention air-introduced machine RB occur after, intertripping homonymy pressure fan; The air-introduced machine that offside does not trip and pressure fan, exert oneself according to the actual of blower fan, air-introduced machine movable vane aperture and pressure fan movable vane aperture is increased with given pace respectively on former movable vane aperture basis, roughly balance to keep air-supply, air inducing in burner hearth, maintain furnace pressure in controlled range, stablize boiler combustion; Solve high sodium brown coal tower boiler unit furnace gun pressure fluctuation large, when air-introduced machine RB occurs, easily cause the problem of unit tripping; Avoid and cause unit failure to shut down, improve stability and the security of unit operation, reduce unit non-programmed halt number of times.
Claims (8)
1. an air-introduced machine RB control method for high sodium brown coal tower boiler unit, it is characterized in that, unit comprises boiler, steam turbine, generator, coal pulverizer, primary air fan, pressure fan, air-introduced machine, plasma burner, DCS control system; Pressure fan and air-introduced machine are configured with two respectively, are arranged in boiler both sides; Coal pulverizer comprises the N platform coal pulverizer (pulverized coal channel of coal pulverizer is presented understructure and arranged in boiler) presented understructure and arrange; Plasma burner comprises the two-layer plasma burner in upper and lower structural configuration, and every layer comprises M plasma burner;
After air-introduced machine RB occurs, DCS control system carries out following control:
A): unit allocation mode is switched to TF mode from AGC mode or CCS; Boiler master is switched to manual mode;
B): main steam pressure setting value first follows the tracks of actual main steam pressure, then change to target pressure value by RB sliding pressure speed; In RB control procedure, main steam pressure setting value is that the sliding pressure value that unit load is corresponding adds that 0.3MPa's is biased;
C): tripping operation homonymy pressure fan; Do not trip air-introduced machine and pressure fan of offside increases air-introduced machine movable vane aperture and pressure fan movable vane aperture, until desired value with given pace respectively on former aperture basis;
In air-introduced machine movable vane aperture and pressure fan movable vane aperture increase process, real-time monitoring hearth pressure, pressure fan electric current and air-introduced machine electric current; If furnace pressure >+500Pa, or pressure fan electric current overrate, then locking pressure fan movable vane increases; If furnace pressure <-500Pa, or air-introduced machine electric current overrate, then locking air-introduced machine movable vane increases;
After air-introduced machine movable vane aperture and pressure fan movable vane aperture reach desired value, recovery air-introduced machine movable vane and pressure fan movable vane control automatically;
When air-introduced machine RB occurs, the air inducing automatic control system in shielding DCS control system cuts greatly manual condition with the regulated variable in air-supply automatic control system and setting value deviation;
D): from the superiors' coal pulverizer, at interval of time t
1tripping operation one deck coal pulverizer, final 4 coal pulverizers retaining lower floor run;
Drop into lower floor's plasma burner to run, delay time t
2drop into upper strata plasma burner again to run;
E): when load reaches target load, air-introduced machine RB controls automatically to terminate, or unit major parameter stable after controlled to terminate by operations staff's manual confirmation air-introduced machine RB.
2. the air-introduced machine RB control method of high sodium brown coal tower boiler unit according to claim 1, is characterized in that, c), air-introduced machine increases air-introduced machine movable vane aperture with the speed of 1.0%/s, and desired value is 90%; Pressure fan increases pressure fan movable vane aperture with the speed of 0.6%/s, and desired value is 83%.
3. the air-introduced machine RB control method of high sodium brown coal tower boiler unit according to claim 2, is characterized in that, for 600MW level supercritical unit, described RB sliding pressure speed is 1.2MPa/min.
4. the air-introduced machine RB control method of high sodium brown coal tower boiler unit according to claim 3, it is characterized in that, for 660MW supercritical unit, unit load---the corresponding relation of main steam pressure setting value is as shown in table 1:
Table 1 unit load---main steam pressure setting value correspondence table
5. the air-introduced machine RB control method of high sodium brown coal tower boiler unit according to claim 4, it is characterized in that, described target load is 50% unit rated load.
6. the air-introduced machine RB control method of high sodium brown coal tower boiler unit according to claim 5, is characterized in that, described time t
1=10s, time t
2=15s.
7. the air-introduced machine RB control method of the high sodium brown coal tower boiler unit according to any one of claim 1 ~ 6, is characterized in that, N=6, M=4.
8. the air-introduced machine RB control method of the high sodium brown coal tower boiler unit according to any one of claim 1 ~ 6, is characterized in that, described furnace pressure adopts pressure transmitter measurement, and pressure fan and air-introduced machine electric current adopt current transducer to measure.
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Cited By (11)
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| CN106200704A (en) * | 2016-08-31 | 2016-12-07 | 广东电网有限责任公司电力科学研究院 | A kind of RB process main vapour pressure setting value operation method and system |
| CN107036067A (en) * | 2017-06-27 | 2017-08-11 | 哈尔滨理工大学 | A kind of efficient fuel coal boiler control system |
| CN107100877A (en) * | 2017-05-31 | 2017-08-29 | 上海明华电力技术工程有限公司 | A kind of booster fan RB control methods based on booster fan system state monitoring |
| CN107228088A (en) * | 2017-05-31 | 2017-10-03 | 上海明华电力技术工程有限公司 | A kind of pressure fan RB control methods based on blower system status monitoring |
| CN107246401A (en) * | 2017-05-31 | 2017-10-13 | 上海明华电力技术工程有限公司 | A kind of air-introduced machine RB control methods based on draught fan system status monitoring |
| CN107314395A (en) * | 2017-07-11 | 2017-11-03 | 攀钢集团攀枝花钢钒有限公司 | The method of fast cutback under unit style generating set emergency situation |
| CN112540537A (en) * | 2020-12-04 | 2021-03-23 | 浙江浙能技术研究院有限公司 | Unit RB target load self-adaptive generation method based on auxiliary machine state |
| CN113064345A (en) * | 2021-03-19 | 2021-07-02 | 西安热工研究院有限公司 | System and method for controlling sliding pressure rate in auxiliary machine fault load reduction process |
| CN114153239A (en) * | 2021-11-15 | 2022-03-08 | 国网山东省电力公司电力科学研究院 | RB sliding pressure instruction adjusting method and device based on unit load and computer equipment |
| WO2023088279A1 (en) * | 2021-11-18 | 2023-05-25 | 西安热工研究院有限公司 | System and method for improving rb working condition of induced draft fan of two-boiler one-machine thermal power generating unit |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105844400A (en) * | 2016-03-22 | 2016-08-10 | 大唐贵州野马寨发电有限公司 | Thermal power plant consumption difference analysis and management method and system |
| CN106200704A (en) * | 2016-08-31 | 2016-12-07 | 广东电网有限责任公司电力科学研究院 | A kind of RB process main vapour pressure setting value operation method and system |
| CN106200704B (en) * | 2016-08-31 | 2019-05-21 | 广东电网有限责任公司电力科学研究院 | A kind of RB process main vapour pressure setting value operation method and system |
| CN107100877A (en) * | 2017-05-31 | 2017-08-29 | 上海明华电力技术工程有限公司 | A kind of booster fan RB control methods based on booster fan system state monitoring |
| CN107228088A (en) * | 2017-05-31 | 2017-10-03 | 上海明华电力技术工程有限公司 | A kind of pressure fan RB control methods based on blower system status monitoring |
| CN107246401A (en) * | 2017-05-31 | 2017-10-13 | 上海明华电力技术工程有限公司 | A kind of air-introduced machine RB control methods based on draught fan system status monitoring |
| CN107246401B (en) * | 2017-05-31 | 2019-02-01 | 上海明华电力技术工程有限公司 | A kind of air-introduced machine RB control method based on draught fan system status monitoring |
| CN107036067A (en) * | 2017-06-27 | 2017-08-11 | 哈尔滨理工大学 | A kind of efficient fuel coal boiler control system |
| CN107314395B (en) * | 2017-07-11 | 2019-05-10 | 攀钢集团攀枝花钢钒有限公司 | The method of fast cutback under unit style generating set emergency situation |
| CN107314395A (en) * | 2017-07-11 | 2017-11-03 | 攀钢集团攀枝花钢钒有限公司 | The method of fast cutback under unit style generating set emergency situation |
| CN112540537A (en) * | 2020-12-04 | 2021-03-23 | 浙江浙能技术研究院有限公司 | Unit RB target load self-adaptive generation method based on auxiliary machine state |
| CN112540537B (en) * | 2020-12-04 | 2022-05-31 | 浙江浙能技术研究院有限公司 | Unit RB target load self-adaptive generation method based on auxiliary machine state |
| CN113064345A (en) * | 2021-03-19 | 2021-07-02 | 西安热工研究院有限公司 | System and method for controlling sliding pressure rate in auxiliary machine fault load reduction process |
| CN114153239A (en) * | 2021-11-15 | 2022-03-08 | 国网山东省电力公司电力科学研究院 | RB sliding pressure instruction adjusting method and device based on unit load and computer equipment |
| CN114153239B (en) * | 2021-11-15 | 2023-09-15 | 国网山东省电力公司电力科学研究院 | RB sliding pressure instruction adjusting method and device based on unit load and computer equipment |
| WO2023088279A1 (en) * | 2021-11-18 | 2023-05-25 | 西安热工研究院有限公司 | System and method for improving rb working condition of induced draft fan of two-boiler one-machine thermal power generating unit |
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Application publication date: 20151209 |