CN109057897B - Steam source switching method for thermal power generating unit FCB - Google Patents
Steam source switching method for thermal power generating unit FCB Download PDFInfo
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- CN109057897B CN109057897B CN201810564020.XA CN201810564020A CN109057897B CN 109057897 B CN109057897 B CN 109057897B CN 201810564020 A CN201810564020 A CN 201810564020A CN 109057897 B CN109057897 B CN 109057897B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
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Abstract
The invention discloses a steam source switching method for a thermal power generating unit FCB, which comprises the following steps: when the thermal power generating unit operates alone and is in bad natural weather or peak power utilization, the auxiliary steam supply small electric door is controlled to be opened in advance; if the auxiliary steam supply small motor electric door is not opened in advance, controlling the auxiliary steam supply small motor electric door to be opened when the FCB acts; when the FCB acts, if the auxiliary steam supply small machine electric door is not opened, the high-pressure regulating door of the small machine is controlled to be opened by over regulation so as to connect a cold re-supply steam source into the small steam turbine; when the FCB acts, the cold re-supply auxiliary steam adjusting door is opened to a preset opening degree so as to maintain the pressure of the auxiliary steam main pipe to be stable; when the FCB is active, the steam feed pump recirculation is turned on to switch to single steam feed pump operation and to keep the other steam feed pump rotating for standby.
Description
Technical Field
The invention relates to the field of thermal power generation, in particular to a steam source switching method for a thermal power generating unit FCB.
Background
Along with the expansion of the capacity of the power grid, the security of the power grid operation in all countries in the world is more and more emphasized, wherein the requirement that the generator set has the FCB function is an important measure for ensuring the safe and stable operation of the power grid and the generator set. However, the main stream unit in China is not designed for realizing the FCB function at the beginning, and if the FCB function is realized on the basis of the existing unit, the technical difficulty is high, especially in the aspect of fast water reduction in the FCB process. The main difficulties of the fast water reducing control technology in the FCB are two, wherein one problem is that the steam source switching process of the small and medium-sized turbines in operation is unstable, and the normal four steam extraction sources need to be switched to cold steam supply or auxiliary steam supply within 1 to 2 seconds.
In order to solve the problem of unstable steam source switching, the electric feed water pump can be started or maintained to operate before the FCB, and boiler feed water is provided by the electric feed water pump during the FCB so as to meet the requirement of minimum feed water flow. However, the mode is difficult to meet the requirement of a unit which does not adopt a steam feed pump to normally supply water to the boiler, and the application range is small; the current for starting the electric water feeding pump is too large, the voltage is too low, and the unit FCB is easy to fail; in addition, it is uneconomical if the electric feed pump is maintained in operation for a long time.
Disclosure of Invention
The invention aims to provide a steam source switching method for a thermal power generating unit FCB, which solves the problem of unstable boiler steam source switching process when the thermal power generating unit FCB is used, and improves the reliability of the FCB action.
In order to achieve the above object, the present invention provides a steam source switching method for a thermal power generating unit FCB, including:
when the thermal power generating unit operates alone and is in bad natural weather or peak power utilization, the auxiliary steam supply small electric door is controlled to be opened in advance;
if the auxiliary steam supply small motor electric door is not opened in advance, controlling the auxiliary steam supply small motor electric door to be opened when the FCB acts;
when the FCB acts, if the auxiliary steam supply small machine electric door is not opened, the high-pressure regulating door of the small machine is controlled to be opened by over regulation so as to connect a cold re-supply steam source into the small steam turbine;
when the FCB acts, the cold re-supply auxiliary steam adjusting door is opened to a preset opening degree so as to maintain the pressure of the auxiliary steam main pipe to be stable;
when the FCB is active, the steam feed pump recirculation is turned on to switch to single steam feed pump operation and to keep the other steam feed pump rotating for standby.
Preferably, when the weather forecast meets the preset judgment condition of the severe natural weather, the auxiliary steam supply small motor electric door is controlled to be opened in advance.
Preferably, the auxiliary steam main pipe is provided with a drainage device for keeping the auxiliary steam main pipe hot for standby.
Preferably, when the small-machine high-pressure regulating valve is controlled to be opened according to the overshoot so that the cold re-steam supply source is connected to the small steam turbine and the FCB acts stably, the auxiliary steam supply small-machine electric valve is gradually opened.
Preferably, when the FCB is activated, the small low pressure governor is switched to control the rotation speed of the steam feed pump, and the small high pressure governor is switched to control the inlet steam pressure of the steam feed pump.
Preferably, after the FCB is operated and the auxiliary steam supply small motor electric door is opened, the opening degree of the small motor low-pressure regulating door corresponding to the steam feed pump which keeps running is controlled to control the stability of the water feed flow.
Preferably, when the FCB is actuated and the auxiliary steam supply small motor electric door is not opened, the small motor low-pressure regulating valve corresponding to the steam feed water pump which is kept in operation is controlled to increase the opening degree and the small motor high-pressure regulating valve corresponding to the steam feed water pump which is kept in operation is controlled to open to the corresponding opening degree, so as to control the boiler feed water flow to be stable.
Preferably, after the FCB is activated, the auxiliary steam supply shaft seal adjusting door is controlled to open to a corresponding opening degree to maintain the pressure of the shaft seal main pipe stable.
Preferably, after the FCB is activated, the cold re-supply shaft seal damper is controlled to increase the opening degree and the auxiliary steam supply shaft seal damper is controlled to open to the corresponding opening degree to maintain the pressure of the shaft seal main pipe stable.
Preferably, when the FCB is activated, the second-stage steam extraction electric door of the No. 2 high-pressure heater is controlled to a preset opening degree so as to maintain the temperature of the boiler feed water to be stable.
Preferably, when the FCB is activated, the auxiliary steam-supplying deaerator adjusting door is opened to a predetermined opening degree to maintain the deaerator pressure and temperature stable, thereby preventing the deaerator from boiling.
Compared with the prior art, the thermal power generating unit controls the auxiliary steam supply small electric door to be opened in advance when the thermal power generating unit operates in a single machine and is in bad natural weather or peak power utilization, so that an auxiliary steam source can be quickly connected into a small steam turbine when the FCB acts, and the reliability of the FCB action is further improved; when the FCB acts, if the electric door of the auxiliary steam supply small machine is not opened, the high-pressure regulating door of the small machine is controlled to be opened in an overshooting mode to connect a cold re-supply steam source into the small steam turbine, so that the stability of the steam source of the small steam turbine is kept, and the MFT is prevented from being triggered by water cut of the boiler; when the FCB acts, the cold re-supply auxiliary steam adjusting door is opened to a preset opening degree to maintain the pressure stability of the auxiliary steam main pipe, and meanwhile, the steam-driven water feed pump is started to recirculate to switch to a single steam-driven water feed pump to operate, so that the disturbance of the operating steam-driven water feed pump is reduced. The steam source switching method for the FCB of the thermal power generating unit is wide in application range, economical and practical.
Drawings
Fig. 1 is a schematic diagram of a steam source system for a thermal power generating unit according to an embodiment of the present invention.
Fig. 2 is a schematic partial structural view of a thermal power generating unit according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a control relationship of a control system of a thermal power generating unit according to an embodiment of the present invention.
Fig. 4 is a graph of a parameter of a first experiment for switching a steam source in the FCB of the thermal power generating unit according to the embodiment of the present invention.
Fig. 5 is a graph of parameters of a second experiment for switching the steam source in the FCB of the thermal power generating unit according to the embodiment of the present invention.
Detailed Description
In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.
Referring to fig. 1 to 3, an embodiment of the present invention discloses a steam source system 100 for a thermal power generating unit, which includes a small steam turbine 11, a steam-driven water-feeding pump 12, a four-stage steam extraction system 13, an auxiliary steam system 14, a reheat cooling stage steam system 15 and a control system 16, wherein the small steam turbine 11 is connected to the steam-driven water-feeding pump 12, the small steam turbine 11 is connected to a main steam inlet pipeline 1, a main steam valve 17 and a small machine low-pressure regulating valve 18 are sequentially disposed on the main steam inlet pipeline 1 along a steam inlet path, the main steam inlet pipeline 1 is connected to the auxiliary steam system 14 through an auxiliary steam branch pipeline 2, the main steam inlet pipeline 1 is connected to the four-stage steam extraction system 13 through a steam extraction branch pipeline 3, the main steam inlet pipeline 1 is connected to the reheat cooling stage steam system 15 through a cold re-supply branch pipeline 4, an auxiliary steam supply small machine electric valve 19 is disposed on the auxiliary steam branch pipeline 2, an electric valve 21 for pumping small steam supply is disposed on the steam branch, the cold re-supply branch pipeline 4 is provided with a cold re-supply small motor electric door 22 and a small motor high-pressure regulating door 23, and the control system 16 controls the main valve 17, the small motor high-pressure regulating door 23, the small motor low-pressure regulating door 18, the auxiliary steam supply small motor electric door 19, the steam extraction and supply small motor electric door 21 and the cold re-supply small motor electric door 22.
Preferably, a first drainage device 24 is arranged on the auxiliary steam main pipe of the auxiliary steam branch pipeline 2 to keep the auxiliary steam main pipe hot for standby; in the present embodiment, the first drain device 24 is provided between the auxiliary steam supply small motor electric door 19 and the auxiliary steam system 14.
Preferably, the steam extraction branch pipeline 3 is provided with a second water drainage device 25; the cold re-supply branch pipeline 4 is provided with a third water drainage device 26.
Specifically, the auxiliary steam system 14 is connected to the deaerator 5, the deaerator 5 is connected to the steam feed pump 12, an auxiliary steam supply deaerator adjusting door 6 is arranged on a pipeline between the auxiliary steam system 14 and the deaerator 5, the steam feed pump 12 is connected to the boiler 8 through the No. 1 high-pressure heater 7a, the No. 2 high-pressure heater 7b and the No. 3 high-pressure heater 7c, a section of steam extraction electric door 9a is arranged on a pipeline between the cold reheat steam system 15 and the No. 1 high-pressure heater 7a, a section of steam extraction electric door 9b is arranged on a pipeline between the cold reheat steam system 15 and the No. 2 high-pressure heater 7b, and a section of steam extraction electric door 9c is arranged on a pipeline between the cold reheat steam system 15 and the No. 3 high-pressure heater 7 c.
Referring to fig. 3, preferably, the thermal power generating unit further includes a sensing device 27 for sensing a weather condition, and when the weather condition sensed by the sensing device 27 meets a preset judgment condition of severe natural weather, the control system 16 controls the auxiliary steam supply small electric door 19 to be opened in advance.
Preferably, the control system 16 switches the small-machine low-pressure regulating valve 18 to control the rotation speed of the steam feed water pump 12 and switches the small-machine high-pressure regulating valve 23 to control the inlet steam pressure of the steam feed water pump 12 during FCB; thereby, the stability of the rotational speed control of the small steam turbine 11 is effectively improved.
The invention also provides a steam source switching method for the FCB of the thermal power generating unit, which comprises the following steps:
when the thermal power generating unit operates alone and is in bad natural weather or peak power utilization, the auxiliary steam supply small motor electric door 19 is controlled to be opened in advance;
if the auxiliary steam supply small motor electric door 19 is not opened in advance, controlling the auxiliary steam supply small motor electric door 19 to be opened when the FCB acts;
when the FCB acts, if the auxiliary steam supply small machine electric door 19 is not opened, the overshoot control small machine high-pressure regulating door 23 is opened to connect a cold re-supply steam source into the small steam turbine 11;
when the FCB acts, a cold re-supply auxiliary steam adjusting valve (not shown) is opened to a preset opening degree so as to maintain the pressure of an auxiliary steam main pipe to be stable;
when the FCB is active, the steam feed pump recirculation is turned on to switch to single steam feed pump 12 operation and to keep the other steam feed pump 12 running for standby.
Preferably, when the weather forecast meets the preset judgment condition of the severe natural weather, the auxiliary steam supply small motor electric door 19 is controlled to be opened in advance.
Preferably, after the small turbine high pressure regulating valve 23 is opened according to the overshoot control to connect the cold re-supply steam source to the small turbine 11 and the FCB action is stable, the auxiliary steam supply small motor electric valve 19 is gradually opened.
Preferably, when the FCB is activated, the small-turbine low-pressure governor 18 is switched to control the rotation speed of the steam feed pump 12, and the small-turbine high-pressure governor 23 is switched to control the inlet steam pressure of the steam feed pump 12, so as to effectively improve the stability of the rotation speed control of the small steam turbine 11.
Preferably, after the FCB is activated and the auxiliary steam supply small motor electric door 19 is opened, the opening degree of the small motor low pressure regulating door 18 corresponding to the steam feed water pump 12 which is kept running is controlled to control the feed water flow to be stable, so that the feed water flow of the boiler 8 fluctuates in a proper range.
Preferably, when the FCB is activated and the auxiliary steam-supply small motor electric door 19 is not opened, the small motor low pressure regulating valve 18 corresponding to the steam-driven feed water pump 12 which keeps running is controlled to increase the opening degree and the small motor high pressure regulating valve 23 corresponding to the steam-driven feed water pump 12 which keeps running is controlled to open to the corresponding opening degree, so as to control the feed water flow of the boiler 8 to be stable, and thus the feed water flow of the boiler 8 fluctuates in a proper range.
Preferably, after the FCB is activated, the auxiliary steam supply shaft seal adjusting valve (not shown) is controlled to open to a corresponding opening degree to maintain the pressure of the shaft seal main pipe stable.
Preferably, after the FCB is activated, the cold re-supply shaft seal damper (not shown) is controlled to increase the opening degree and the auxiliary steam supply shaft seal damper is controlled to open to the corresponding opening degree to maintain the pressure of the shaft seal main pipe stable.
Referring to fig. 2, preferably, when the FCB is activated, the second-stage steam extraction electric door 9b of the No. 2 high-pressure heater 7b is controlled to a predetermined opening degree to maintain the feed water temperature of the boiler 8 stable.
Preferably, when the FCB is activated, the auxiliary steam-supplying deaerator adjusting door 6 is opened to a predetermined opening degree to maintain the pressure and temperature of the deaerator 5 stable, thereby preventing the deaerator 5 from boiling.
Specific examples of the present invention are illustrated below in conjunction with two experiments:
experiment one (please refer to FIG. 4)
In 2016, 6 months, 30 days, 18:31:12, before FCB triggering, the unit load is 330MW, the main steam pressure is 13.3MPa, the opening degree of the small-machine low-pressure regulating valve 18 is 27.5 percent, the rotating speed is 3826r/m, the opening degree of the small-machine low-pressure regulating valve 18 is 23.3 percent, the rotating speed is 3819r/m, and at the moment, the water supply flow of the boiler 8 is 917 t/h.
Under the condition that the electric door 19 of the auxiliary steam supply small turbine is opened in advance, the steam source of the small steam turbine 11 is switched to an auxiliary steam source when the unit FCB is started; meanwhile, opening a cold secondary steam supply adjusting valve to a preset opening degree so as to maintain the pressure of the auxiliary steam main pipe to be stable; and starting the steam feed water pump recirculation to switch to the operation of a single steam feed water pump 12 and keeping the other steam feed water pump 12 only rotating for standby; and the small machine low pressure regulating valve 18 is switched to control the rotating speed of the steam feed water pump 12, and the small machine high pressure regulating valve 23 is switched to control the inlet steam pressure of the steam feed water pump 12.
After the FCB action is triggered, the ratio of 18:35:26 is achieved, the main steam pressure is increased to 15.2MPa, the opening degree of a small machine low-pressure regulating valve 18 of the running steam-driven water-feeding pump 12 is 30.75%, the rotating speed of the running steam-driven water-feeding pump 12 is 4199r/m, the outlet pressure is 17.94MPa, the opening degree of a small machine low-pressure regulating valve 18 of the standby steam-driven water-feeding pump 12 is 23.31%, the rotating speed of the standby steam-driven water-feeding pump 12 is 3831r/m, and the outlet pressure is 17.19MPa respectively. Due to the individual power of the individual steam feed pumps 12, the feed water flow of the boiler 8 rapidly drops to 551t/h and fluctuates in the range of 551t/h to 600 t/h.
After the FCB action is triggered, the opening degree of the cold re-supply auxiliary steam regulating valve is opened from 0% of 18:32:00 to 97%, and the pressure of the auxiliary steam main pipe is increased from 0.531MPa to 0.683MPa and tends to be stable. The pressure of the auxiliary steam main pipe is slowly reduced from 0.947MPa, and the pressure of the 18:38:00 auxiliary cold re-supply steam regulating valve is reduced to 0.623MPa at the lowest from 18:40: 38. The water quantity in the whole process is smoothly controlled between 549t/h and 590 t/h.
In this experiment, the shaft seal steam was provided by the reheat cold section steam system 15. The opening degree of the cold re-supply shaft seal electric door is opened from a low point to 45%, the opening degree of the auxiliary steam supply shaft seal adjusting door is 23%, and the pressure of the shaft seal main pipe is 30KPa and is stable.
Experiment two (please refer to fig. 5)
In 2016, 7 and 26 days, 18:19:36, before FCB triggering, the load of a unit is 331MW, the main steam pressure is 13.62MPa, the opening degree of the small-machine low-pressure regulating valve 18 is 29.82%, the rotating speed is 3800r/m, the opening degree of the small-machine low-pressure regulating valve 18 is 30.81%, the rotating speed is 3838r/m, and at the moment, the water supply flow of the boiler 8 is 939.5 t/h.
Under the condition that the electric door 19 of the auxiliary steam supply small turbine is opened in advance, the steam source of the small steam turbine 11 is switched to an auxiliary steam source when the unit FCB is started; meanwhile, opening a cold secondary steam supply adjusting valve to a preset opening degree so as to maintain the pressure of the auxiliary steam main pipe to be stable; and starting the steam feed water pump recirculation to switch to the operation of a single steam feed water pump 12 and keeping the other steam feed water pump 12 only rotating for standby; and the small machine low pressure regulating valve 18 is switched to control the rotating speed of the steam feed water pump 12, and the small machine high pressure regulating valve 23 is switched to control the inlet steam pressure of the steam feed water pump 12.
After the FCB action is triggered, the ratio of 18:23:26 is achieved, the main steam pressure is increased to 16.87MPa, the opening degree of a small machine low-pressure regulating valve 18 of the running steam-driven water-feeding pump 12 is 96.21%, the opening degree of a small machine high-pressure regulating valve 23 of the running steam-driven water-feeding pump 12 is 16.06%, the rotating speed of the running steam-driven water-feeding pump 12 is 4349r/m, the outlet pressure is 17.87MPa, the opening degree of a small machine low-pressure regulating valve 18 of the standby steam-driven water-feeding pump 12 is 32.83%, the rotating speed of the standby steam-driven water-feeding pump 12 is 3847r/m, and the outlet pressure is 17.29MPa respectively. Due to the individual power of the single steam feed pump 12, the feed water flow of the boiler 8 rapidly drops to 502t/h and fluctuates in the range of 502t/h to 600 t/h.
After the FCB action is triggered, the opening degree of the cold re-supply auxiliary steam regulating valve is opened to 99.6% from 0% of 18:19:42, the pressure of the auxiliary steam main pipe is firstly reduced to 0.394MPa from 0.541MPa, then is rapidly increased to 0.685MPa, then is slowly reduced, and is reduced to the lowest 0.488MPa at the moment of 18:22: 36. After the opening of an adjusting valve (not shown) of the auxiliary steam oxygen supply deaerator is manually closed to be 11.6% from 16.8%, the pressure of the auxiliary steam main pipe tends to be stable.
In this experiment, the shaft seal steam was provided by the auxiliary steam system 14/84. The opening of the auxiliary steam supply shaft seal regulating valve is 82.2%, the pressure of the shaft seal main pipe is 30KPa, and the auxiliary steam supply shaft seal regulating valve is stable.
Compared with the prior art, the thermal power generating unit controls the auxiliary steam supply small electric door 19 to be opened in advance when the thermal power generating unit operates in a single machine and is in bad natural weather or peak power utilization, so that an auxiliary steam source can be quickly connected to the small steam turbine 11 when the FCB acts, and the reliability of the FCB acts is further improved; when the FCB acts, if the auxiliary steam supply small machine electric door 19 is not opened, the high-pressure regulating door 23 of the small machine is controlled to be opened in an overshooting mode to connect a cold re-supply steam source into the small steam turbine 11, so that the stability of the steam source of the small steam turbine 11 is kept, and the boiler 8 is prevented from being triggered by MFT due to water cut; when the FCB acts, the cold re-supply auxiliary steam adjusting door is opened to a preset opening degree to maintain the pressure stability of the auxiliary steam main pipe, and meanwhile, the steam feed water pump is opened for recirculation to switch to the operation of a single steam feed water pump 12, so that the disturbance of the operating steam feed water pump 12 is reduced. The steam source switching method for the FCB of the thermal power generating unit is wide in application range, economical and practical.
The above disclosure is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, so that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.
Claims (11)
1. A steam source switching method used in an FCB (FCB) of a thermal power generating unit is characterized by comprising the following steps:
when the thermal power generating unit operates alone and is in bad natural weather or peak power utilization, the auxiliary steam supply small electric door is controlled to be opened in advance;
if the auxiliary steam supply small motor electric door is not opened in advance, controlling the auxiliary steam supply small motor electric door to be opened when the FCB acts;
when the FCB acts, if the auxiliary steam supply small machine electric door is not opened, the high-pressure regulating door of the small machine is controlled to be opened by over regulation so as to connect a cold re-supply steam source into the small steam turbine;
when the FCB acts, the cold re-supply auxiliary steam adjusting door is opened to a preset opening degree so as to maintain the pressure of the auxiliary steam main pipe to be stable;
when the FCB is active, the steam feed pump recirculation is turned on to switch to single steam feed pump operation and to keep the other steam feed pump rotating for standby.
2. The steam source switching method for the thermal power generating unit FCB as recited in claim 1, wherein when a weather forecast meets a preset judgment condition of the severe natural weather, the electric door of the auxiliary steam supply small engine is controlled to be opened in advance.
3. The steam source switching method for the thermal power generating unit FCB as recited in claim 1, wherein a drain device for keeping the auxiliary steam main pipe hot for standby is disposed on the auxiliary steam main pipe.
4. The steam source switching method for the thermal power generating unit FCB as claimed in claim 1, wherein the auxiliary steam supply small motor electric door is gradually opened after a small high pressure regulating door is opened according to overshoot control to connect a cold re-supply steam source to the small steam turbine and the FCB is stable in operation.
5. The steam source switching method for the thermal power generating unit FCB according to claim 1, wherein when the FCB is operated, the small machine low pressure regulator is switched to control the rotation speed of the steam feed water pump which is kept in operation, and the small machine high pressure regulator is switched to control the inlet steam pressure of the steam feed water pump which is kept in operation.
6. The steam source switching method for the thermal power generating unit FCB as claimed in claim 1, wherein after the FCB is operated and the auxiliary steam supply small-machine electric door is opened, an opening degree of a small-machine low-pressure regulating valve corresponding to the steam feed water pump which is kept in operation is controlled to control feed water flow to be stable.
7. The steam source switching method for the thermal power generating unit FCB as claimed in claim 1, wherein when the FCB is in operation and the auxiliary steam supply small electric door is not opened, the small low-pressure regulating valve corresponding to the steam feed water pump which is kept in operation is controlled to increase the opening degree and the small high-pressure regulating valve corresponding to the steam feed water pump which is kept in operation is controlled to open to the corresponding opening degree, so that the boiler feed water flow is controlled to be stable.
8. The steam source switching method for the thermal power generating unit FCB as recited in claim 1, wherein after the FCB is activated, the auxiliary steam supply shaft seal regulating valve is controlled to be opened to a corresponding opening degree so as to maintain the pressure of the shaft seal main pipe to be stable.
9. The steam source switching method for the thermal power generating unit FCB as recited in claim 1, wherein after the FCB is activated, the cold re-supply shaft seal electric door is controlled to increase the opening degree and the auxiliary steam supply shaft seal adjusting door is controlled to open to the corresponding opening degree so as to maintain the pressure of the shaft seal main pipe stable.
10. The steam source switching method for the thermal power generating unit FCB as recited in claim 1, wherein when the FCB is activated, a two-stage steam extraction electric door of the cold re-to-No. 2 high-pressure heater is controlled to a preset opening degree to maintain a stable boiler feed water temperature.
11. The steam source switching method for the FCB of the thermal power generating unit according to claim 1, wherein when the FCB is operated, the auxiliary steam-supplying deaerator adjusting door is opened to a preset opening degree to maintain the deaerator pressure and temperature stable and prevent the deaerator from boiling.
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| NL2033329A (en) * | 2022-07-22 | 2022-12-06 | Xian Xire Boiler Environmental Prot Engineering Co Ltd | System and method for switching steam source of steam-driven feed water pump adapted to deep peak regulation |
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| CN105604614A (en) * | 2014-11-20 | 2016-05-25 | 国家电网公司 | Islanding operation control device for self-provided machine set in chemical industry |
| CN106545841A (en) * | 2016-12-07 | 2017-03-29 | 广东电网有限责任公司电力科学研究院 | The water supply control method that a kind of suppression FCB processes main vapour pressure rises |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| NL2033329A (en) * | 2022-07-22 | 2022-12-06 | Xian Xire Boiler Environmental Prot Engineering Co Ltd | System and method for switching steam source of steam-driven feed water pump adapted to deep peak regulation |
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