CN110630551B - Automatic paralleling method and system for induced draft fans of thermal generator set - Google Patents
Automatic paralleling method and system for induced draft fans of thermal generator set Download PDFInfo
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- CN110630551B CN110630551B CN201910851248.1A CN201910851248A CN110630551B CN 110630551 B CN110630551 B CN 110630551B CN 201910851248 A CN201910851248 A CN 201910851248A CN 110630551 B CN110630551 B CN 110630551B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/005—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by changing flow path between different stages or between a plurality of compressors; Load distribution between compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
Abstract
An automatic paralleling method for induced draft fans of a thermal generator set is used for achieving automatic paralleling of a first induced draft fan and a second induced draft fan and comprises the following steps: collecting working currents of a first induced draft fan and a second induced draft fan; calculating the working current difference value of the first induced draft fan and the second induced draft fan, comparing the working current difference value with a preset parallel starting current difference value of the fans, starting a parallel program of the fans if the working current difference value is larger than the parallel starting current difference value of the fans, and continuously comparing the working current difference value with the parallel starting current difference value of the fans if the working current difference value is not larger than the parallel starting current difference value of the fans; and controlling the two draught fans to be parallel according to the working current of the first draught fan and the second draught fan and the negative pressure of the hearth. The embodiment realizes the automatic paralleling of the induced draft fans, and changes the situation that the induced draft fans can be paralleled only through manual operation in the prior art; the current and the negative pressure of the hearth are simultaneously used as criteria for fan paralleling, so that the preparation work before paralleling is reduced, the paralleling speed of the induced draft fans is increased, and the occurrence rate of faults is reduced.
Description
Technical Field
The invention belongs to the field of thermal power generation, and particularly relates to an automatic paralleling method and system for induced draft fans of a thermal generator set.
Background
Along with the implementation of the ultra-low emission policy of the thermal generator set and the gradual increase of the capacity of the existing newly-built thermal generator set, the number of tail flue devices of the boiler is increased, the on-way resistance is increased, and the electric capacity of the induced draft fan is also gradually increased. As a rotating machine, accident conditions such as single-side fan tripping, fan stalling and the like which easily cause unmatched output of two induced fans can inevitably occur in the induced draft fans during operation.
At present, thermal power factory draught fan is arranged and is mainly leaned on manual operation, in view of the operating personnel level differs, and large capacity draught fan is arranged the in-process at the fan, is changeed and is aroused abnormal occurrences such as furnace negative pressure fluctuation, fan surge, stall, causes accident such as boiler fire extinguishing, fan equipment damage even when serious. Therefore, how to realize the automatic paralleling of the induced draft fans and eliminate various risks generated in the paralleling process becomes a key technical problem to be solved urgently.
Disclosure of Invention
In order to solve the problems, the invention provides an automatic thermal generator set induced draft fan parallel method and system which are automatic and can reduce the failure rate.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an automatic paralleling method for induced draft fans of a thermal generator set is used for achieving automatic paralleling of a first induced draft fan and a second induced draft fan and comprises the following steps:
collecting working currents of a first induced draft fan and a second induced draft fan;
calculating a working current difference value of a first induced draft fan and a second induced draft fan, comparing the working current difference value with a preset parallel starting current difference value of the fans, starting a parallel program of the fans if the working current difference value is larger than the parallel starting current difference value of the fans, and continuously comparing the working current difference value with the parallel starting current difference value of the fans if the working current difference value is not larger than the parallel starting current difference value of the fans;
whether detect furnace negative pressure in predetermined safety range, if not in safety range, then adjust the movable vane aperture of first draught fan and second draught fan earlier and let the furnace negative pressure reach safety range, if in safety range, then the movable vane aperture of direct adjustment first draught fan and second draught fan, the working current difference less than or equal to predetermined fan of first draught fan and second draught fan stops the current difference side by side until.
Further, before detecting the furnace negative pressure, the operating current of first draught fan and second draught fan is compared earlier, if the operating current of first draught fan is big then adopt the first regulation parameter group of preset to adjust movable vane aperture, if the operating current of second draught fan is big then adopt the second regulation parameter group of preset to adjust movable vane aperture.
Still further, the first set of tuning parameters includes a first normal pressure tuning parameter, a first low pressure tuning parameter, and a first overpressure tuning parameter; if the negative pressure of the hearth is in the safety range, a first normal pressure regulating parameter is adopted, if the negative pressure exceeds the upper limit of the safety range, a first overpressure regulating parameter is adopted, and if the negative pressure is lower than the lower limit of the safety range, a first low pressure regulating parameter is adopted.
Preferably, the first normal pressure adjusting parameter is that the opening degree of the movable blade of the first induced draft fan is reduced at a rate of 0.7% per second, and the opening degree of the movable blade of the second induced draft fan is increased at a rate of 0.7% per second; the first overpressure adjusting parameter is locking and reducing the opening degree of a movable blade of a first induced draft fan, and the opening degree of a movable blade of a second induced draft fan is increased at the rate of 0.7% per second; the first low-pressure adjusting parameter is used for locking and increasing the movable vane opening degree of the second induced draft fan, and the movable vane opening degree of the first induced draft fan is reduced at the speed of 0.7% per second.
Still further, the second set of tuning parameters includes a second constant pressure tuning parameter, a second low pressure tuning parameter, and a second overpressure tuning parameter; and if the negative pressure of the hearth is in the safety range, adopting a second normal pressure regulating parameter, if the negative pressure exceeds the upper limit of the safety range, adopting a second overpressure regulating parameter, and if the negative pressure is lower than the lower limit of the safety range, adopting a second low pressure regulating parameter.
Preferably, the second normal pressure adjusting parameter is that the opening degree of the movable blade of the second induced draft fan is reduced at a rate of 0.7% per second, and the opening degree of the movable blade of the first induced draft fan is increased at a rate of 0.7% per second; the second overpressure adjusting parameter is locking and reducing the opening degree of a movable blade of a second induced draft fan, and the opening degree of the movable blade of the first induced draft fan is increased at the rate of 0.7% per second; and the second low-pressure adjusting parameter is used for locking and increasing the opening degree of the movable blade of the first induced draft fan, and the opening degree of the movable blade of the second induced draft fan is reduced at the speed of 0.7 percent per second.
Preferably, the difference value of the parallel starting currents of the fans is 25A; the difference value of the parallel termination currents of the fans is 15A; the safety range of the negative pressure of the hearth is-500 Pa to +500 Pa.
A system applying the automatic paralleling method of the induced draft fans of the thermal generator set comprises a first induced draft fan, a second induced draft fan, a sensor unit, a data acquisition unit, an operation controller and a DCS which are sequentially connected; the first induced draft fan and the second induced draft fan are connected with the DCS;
the sensor unit is used for collecting and transmitting the negative pressure of the hearth, the current of the first induced draft fan and the position of the movable vane, and the current of the second induced draft fan and the position of the movable vane; the data acquisition unit is used for preprocessing the received data and transmitting the data; the operation controller is used for calculating adjustment parameters and sending the adjustment parameters to the DCS; and the DCS is used for controlling the system to realize parallel arrangement of the induced draft fans.
Further, the sensor unit comprises a first current sensor, a first movable blade position sensor, a furnace negative pressure sensor, a second current sensor and a second movable blade position sensor.
Preferably, the sensor unit includes a first current sensor group, a first moving blade position sensor group, a furnace negative pressure sensor group, a second current sensor group, and a second moving blade position sensor group.
The embodiment of the invention has the following beneficial effects:
the embodiment realizes the automatic paralleling of the induced draft fans, and changes the situation that the induced draft fans can be paralleled only through manual operation in the prior art;
the current and the negative pressure of the hearth are simultaneously used as criteria for fan paralleling, so that the preparation work before paralleling is reduced, the paralleling speed of the induced draft fans is increased, and the occurrence rate of faults is reduced;
and a control structure combining an operation controller and a DCS is adopted, so that the reaction speed of the system is further accelerated, and the probability of faults is reduced.
Drawings
The following further describes embodiments of the present invention with reference to the drawings.
FIG. 1 is a flow chart of a method of an embodiment of the present invention;
fig. 2 is a schematic system structure according to an embodiment of the present invention.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, an automatic paralleling method for induced draft fans of a thermal generator set is used for realizing automatic paralleling of a first induced draft fan and a second induced draft fan, and is characterized by comprising the following steps:
collecting working currents of a first induced draft fan and a second induced draft fan;
calculating the working current difference value of the first induced draft fan and the second induced draft fan, comparing the working current difference value with a preset parallel starting current difference value of the fans, starting a parallel program of the fans if the working current difference value is larger than the parallel starting current difference value of the fans, and continuously comparing the working current difference value with the parallel starting current difference value of the fans if the working current difference value is not larger than the parallel starting current difference value of the fans;
whether detect furnace negative pressure in predetermined safety range, if not in safety range, then adjust the movable vane aperture of first draught fan and second draught fan earlier and let the furnace negative pressure reach safety range, if in safety range, then the movable vane aperture of direct adjustment first draught fan and second draught fan, the working current difference less than or equal to predetermined fan of first draught fan and second draught fan stops the current difference side by side until.
Before detecting furnace negative pressure, the operating current of first draught fan and second draught fan is compared earlier, if the operating current of first draught fan is big then adopts the first regulation parameter group of presetting to adjust the movable vane aperture, if the operating current of second draught fan is big then adopts the second regulation parameter group of presetting to adjust the movable vane aperture.
The first adjusting parameter group comprises a first normal pressure adjusting parameter, a first low pressure adjusting parameter and a first overpressure adjusting parameter; if the negative pressure of the hearth is in the safety range, a first normal pressure regulating parameter is adopted, if the negative pressure exceeds the upper limit of the safety range, a first overpressure regulating parameter is adopted, and if the negative pressure is lower than the lower limit of the safety range, a first low pressure regulating parameter is adopted.
In this embodiment, the first normal pressure adjustment parameter is that the opening degree of the movable blade of the first induced draft fan is reduced at a rate of 0.7% per second, and the opening degree of the movable blade of the second induced draft fan is increased at a rate of 0.7% per second; the first overpressure adjusting parameter is that the opening degree of a movable blade of the first induced draft fan is reduced in a locking mode, and the opening degree of a movable blade of the second induced draft fan is increased at the speed of 0.7% per second; the first low pressure regulating parameter is that the locking increases the movable vane aperture of second draught fan, reduces the movable vane aperture of first draught fan with 0.7% speed per second.
The second adjusting parameter group comprises a second normal pressure adjusting parameter, a second low pressure adjusting parameter and a second overpressure adjusting parameter; and if the negative pressure of the hearth is in the safety range, adopting a second normal pressure regulating parameter, if the negative pressure exceeds the upper limit of the safety range, adopting a second overpressure regulating parameter, and if the negative pressure is lower than the lower limit of the safety range, adopting a second low pressure regulating parameter.
In this embodiment, the second normal pressure adjustment parameter is that the opening degree of the movable blade of the second induced draft fan is reduced at a rate of 0.7% per second, and the opening degree of the movable blade of the first induced draft fan is increased at a rate of 0.7% per second; the second overpressure adjusting parameter is that the opening degree of a movable blade of the second induced draft fan is reduced in a locking mode, and the opening degree of the movable blade of the first induced draft fan is increased at the rate of 0.7% per second; the second low pressure adjustment parameter is that the locking increases the movable vane aperture of first draught fan, reduces the movable vane aperture of second draught fan with 0.7% per second's speed.
In the embodiment, the difference value of the parallel starting currents of the fans is 25A; the difference value of the parallel termination currents of the fans is 15A; the safety range of negative pressure of the hearth is-500 Pa to +500 Pa.
In this embodiment, each adjustment parameter may be modified according to actual engineering requirements; the safety ranges of the fan parallel starting current difference, the fan parallel termination current difference and the hearth negative pressure can be modified according to the actual engineering conditions.
In this embodiment, having combined two parameters of furnace negative pressure value, fan termination current difference value side by side as the judgement foundation, security that can effectual assurance draught fan is parallel, because the safety control of furnace negative pressure value has mainly been considered at the in-process side by side simultaneously, efficiency that can effectual improvement is parallel automatically, the use that the shutting increases and the shutting reduces in the regulation parameter also can be faster let furnace negative pressure reply in the safety range, the security that the draught fan is parallel improves.
A system applying the automatic paralleling method of the induced draft fans of the thermal generator set comprises a first induced draft fan, a second induced draft fan, a sensor unit 100, a data acquisition unit 200, an operation controller 300 and a DCS system 400 which are sequentially connected; the first induced draft fan and the second induced draft fan are connected with the DCS system 400;
the sensor unit 100 is used for collecting and transmitting hearth negative pressure, first induced draft fan current and movable vane positions, and second induced draft fan current and movable vane positions; the data acquisition unit 200 is used for preprocessing the received data and transmitting the data; the operation controller 300 is used for calculating adjustment parameters and sending the adjustment parameters to the DCS 400; the DCS system 400 is used to control the system to implement parallel induced draft fans.
The sensor unit 100 includes a first current sensor, a first moving blade position sensor, a furnace negative pressure sensor, a second current sensor, and a second moving blade position sensor.
The sensor unit 100 includes a first current sensor group, a first movable blade position sensor group, a furnace negative pressure sensor group, a second current sensor group, and a second movable blade position sensor group. By adopting the mode of the sensor group, the mode of reasonably taking values or taking an average value of a plurality of groups of sensor values can be selected, and partial parameters with larger deviation can be abandoned during reasonable value taking so as to ensure the stability of system control. Meanwhile, the sensor group is adopted to achieve the self-checking function, so that system faults can be found in time conveniently, the parallel safety is ensured, and the operation can be performed according to the mode of a single sensor after the parameters are selected.
In this embodiment, data acquisition is specifically realized in a single sensing manner.
The following describes the specific working process of this embodiment:
s1, the DCS 400 sends an induced draft fan automatic parallel instruction to the operation controller 300, and the system starts a parallel program;
s2, the first current sensor and the first movable blade position sensor start to acquire first induced draft fan current and movable blade position information, the hearth negative pressure sensor starts to acquire hearth negative pressure, and the second current sensor and the second movable blade position sensor start to acquire second induced draft fan current and movable blade position information;
s3, the data acquisition unit 200 synchronously receives the information acquired by the sensors and transmits the information to the operation controller 300;
s4, the operation controller 300 calculates adjusting parameters needed by the movable blades of the first induced draft fan and the second induced draft fan according to the received information, and sends the adjusting parameters to the DCS system 400;
s5, after receiving the adjusting parameters, the DCS system 400 controls the first induced draft fan and the second induced draft fan to adjust the opening of the movable blades;
and S6, repeating the steps S2-S5 until the fans are paralleled, and sending an automatic parallel command for stopping the induced draft fans by the DCS 400.
In this embodiment, the data acquisition unit 200 adopts the KM231A of tokyo, the operation controller 300 adopts the KM950A of tokyo, and the DCS system 400 adopts the NT6000 system of tokyo; in this embodiment, the operation controller 300 is connected to the DCS system 400 through a Modbus communication interface overlapping bidirectional data transmission link, and a communication module of the Modbus communication interface adopts the KM631A from tokyo.
In this embodiment, the operation controller 300 is mainly responsible for calculating the adjustment parameters, and the DCS system 400 is responsible for specifically controlling the parallel processes, so that the complex operation process is delivered to the operation controller 300, which can improve the stability of the system and facilitate the later maintenance of the system.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and any technical means that can achieve the object of the present invention by basically the same means is within the scope of the present invention.
Claims (10)
1. An automatic paralleling method for induced draft fans of a thermal generator set is used for achieving automatic paralleling of a first induced draft fan and a second induced draft fan and is characterized by comprising the following steps:
collecting working currents of a first induced draft fan and a second induced draft fan;
calculating a working current difference value of a first induced draft fan and a second induced draft fan, comparing the working current difference value with a preset parallel starting current difference value of the fans, starting a parallel program of the fans if the working current difference value is larger than the parallel starting current difference value of the fans, and continuously comparing the working current difference value with the parallel starting current difference value of the fans if the working current difference value is not larger than the parallel starting current difference value of the fans;
whether detect furnace negative pressure in predetermined safety range, if not in safety range, then adjust the movable vane aperture of first draught fan and second draught fan earlier and let the furnace negative pressure reach safety range, if in safety range, then the movable vane aperture of direct adjustment first draught fan and second draught fan, the working current difference less than or equal to predetermined fan of first draught fan and second draught fan stops the current difference side by side until.
2. The automatic paralleling method for induced draft fans of thermal generator sets according to claim 1, characterized in that: before detecting furnace negative pressure, compare the operating current of first draught fan and second draught fan earlier, if the operating current of first draught fan is big then adopt the first regulation parameter group of predetermineeing to adjust the movable vane aperture, if the operating current of second draught fan is big then adopt the second regulation parameter group of predetermineeing to adjust the movable vane aperture.
3. The automatic paralleling method for induced draft fans of thermal generator sets according to claim 2, characterized in that: the first adjusting parameter group comprises a first normal pressure adjusting parameter, a first low pressure adjusting parameter and a first overpressure adjusting parameter; if the negative pressure of the hearth is in the safety range, a first normal pressure regulating parameter is adopted, if the negative pressure exceeds the upper limit of the safety range, a first overpressure regulating parameter is adopted, and if the negative pressure is lower than the lower limit of the safety range, a first low pressure regulating parameter is adopted.
4. The automatic paralleling method for induced draft fans of thermal generator sets according to claim 3, characterized in that: the first normal pressure adjusting parameter is that the opening degree of a movable blade of a first induced draft fan is reduced at the rate of 0.7% per second, and the opening degree of a movable blade of a second induced draft fan is increased at the rate of 0.7% per second; the first overpressure adjusting parameter is locking and reducing the opening degree of a movable blade of a first induced draft fan, and the opening degree of a movable blade of a second induced draft fan is increased at the rate of 0.7% per second; the first low-pressure adjusting parameter is used for locking and increasing the movable vane opening degree of the second induced draft fan, and the movable vane opening degree of the first induced draft fan is reduced at the speed of 0.7% per second.
5. The automatic paralleling method for induced draft fans of thermal generator sets according to claim 2, characterized in that: the second adjusting parameter group comprises a second normal pressure adjusting parameter, a second low pressure adjusting parameter and a second overpressure adjusting parameter; and if the negative pressure of the hearth is in the safety range, adopting a second normal pressure regulating parameter, if the negative pressure exceeds the upper limit of the safety range, adopting a second overpressure regulating parameter, and if the negative pressure is lower than the lower limit of the safety range, adopting a second low pressure regulating parameter.
6. The automatic paralleling method for induced draft fans of thermal generator sets according to claim 5, characterized in that: the second normal pressure adjusting parameter is that the opening degree of a movable blade of the second induced draft fan is reduced at the rate of 0.7% per second, and the opening degree of a movable blade of the first induced draft fan is increased at the rate of 0.7% per second; the second overpressure adjusting parameter is locking and reducing the opening degree of a movable blade of a second induced draft fan, and the opening degree of the movable blade of the first induced draft fan is increased at the rate of 0.7% per second; and the second low-pressure adjusting parameter is used for locking and increasing the opening degree of the movable blade of the first induced draft fan, and the opening degree of the movable blade of the second induced draft fan is reduced at the speed of 0.7 percent per second.
7. The automatic paralleling method for induced draft fans of thermal generator sets according to claim 1, characterized in that: the difference value of the parallel starting currents of the fans is 25A; the difference value of the parallel termination currents of the fans is 15A; the safety range of the negative pressure of the hearth is-500 Pa to +500 Pa.
8. A system applying the automatic paralleling method of the induced draft fans of the thermal generator set according to any one of claims 1 to 7 is characterized in that: the system comprises a first induced draft fan, a second induced draft fan, a sensor unit (100), a data acquisition unit (200), an operation controller (300) and a DCS (400) which are connected in sequence; the first induced draft fan and the second induced draft fan are connected with the DCS (400);
the sensor unit (100) is used for collecting and transmitting negative pressure of a hearth, current of a first induced draft fan and the position of a movable blade, and current of a second induced draft fan and the position of the movable blade; the data acquisition unit (200) is used for preprocessing received data and transmitting the data; the operation controller (300) is used for calculating adjusting parameters and sending the adjusting parameters to the DCS (400); and the DCS (400) is used for controlling the system to realize parallel arrangement of induced draft fans.
9. The system of claim 8, wherein: the sensor unit (100) comprises a first current sensor, a first movable blade position sensor, a furnace negative pressure sensor, a second current sensor and a second movable blade position sensor.
10. The system of claim 8, wherein: the sensor unit (100) comprises a first current sensor group, a first movable blade position sensor group, a hearth negative pressure sensor group, a second current sensor group and a second movable blade position sensor group.
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| CN113864224B (en) * | 2021-11-30 | 2022-03-01 | 华电电力科学研究院有限公司 | Double-fan control method, device and equipment and double-fan system |
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