CN113983449B - Depth peak shaving-based water supply pump control method - Google Patents
Depth peak shaving-based water supply pump control method Download PDFInfo
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- CN113983449B CN113983449B CN202111164268.5A CN202111164268A CN113983449B CN 113983449 B CN113983449 B CN 113983449B CN 202111164268 A CN202111164268 A CN 202111164268A CN 113983449 B CN113983449 B CN 113983449B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 227
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004886 process control Methods 0.000 claims abstract description 8
- 238000011946 reduction process Methods 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000008400 supply water Substances 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/32—Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention belongs to the technical field of water feed pump control methods, and particularly relates to a water feed pump control method based on deep peak shaving, which comprises load lifting process control and load reducing process control, wherein 1) the load lifting process starts an automatic step sequence after an automatic trigger pump reversing condition is met, and an electric water feed pump automatically switches a steam water feed pump; the automatic triggering pump reversing condition is as follows: the electric water supply pump is automatically started; the current load of the unit is 80% greater than the design capacity of the electric water supply pump; calculating deviation of the load in real time by utilizing the lead-lag functional block, and judging that the load is increasing; 2) In the load reduction process, when the condition of automatically triggering the pump reversing is met, an automatic step sequence is started, and the motor-driven water supply pump is automatically switched by the steam-driven water supply pump; the automatic triggering pump reversing condition is as follows: automatic pumping of the pneumatic water supply pump; the real-time load is lower than the steady output of starting the water feeding pump; and calculating deviation of the load in real time by utilizing the lead-lag functional block, and judging that the load is reduced. By adopting the method, the automatic switching control of the water supply pump can be adapted to the deep peak shaving.
Description
Technical Field
The invention belongs to the technical field of water feed pump control methods, and particularly relates to a water feed pump control method based on deep peak shaving.
Background
In recent years, as the lower load limit of a thermal power generating unit is continuously explored, the adjustment interval is wider and wider, the pneumatic feed pump arranged in the unit is influenced by the instability of a driving steam source in a low load section, the problems of load swing, poor feed response and even incapability of connecting lower loads occur, the pneumatic feed pump needs to be cut into an electric feed pump to operate, the load rebound is in consideration of the economy of the unit operation, and the electric feed pump needs to be cut into the pneumatic feed pump to operate. However, the existing system cannot adapt to automatic switching control under deep peak shaving.
Disclosure of Invention
Aiming at the technical problems, the invention provides a water feed pump control method based on depth peak shaving, which can adapt to the automatic switching control of the water feed pump of the depth peak shaving.
In order to solve the technical problems, the invention adopts the following technical scheme:
a water supply pump control method based on deep peak shaving comprises load rising process control and load falling process control,
1) In the load lifting process, when the condition of automatically triggering the pump reversing is met, an automatic step sequence is started, and the motor-driven water supply pump automatically switches the motor-driven water supply pump; the automatic triggering pump reversing condition is as follows: the electric water supply pump is automatically started; the current load of the unit is 80% greater than the design capacity of the electric water supply pump; calculating deviation of the load in real time by utilizing the lead-lag functional block, and judging that the load is increasing;
2) In the load reduction process, when the condition of automatically triggering the pump reversing is met, an automatic step sequence is started, and the motor-driven water supply pump is automatically switched by the steam-driven water supply pump; the automatic triggering pump reversing condition is as follows: automatic pumping of the pneumatic water supply pump; the real-time load is lower than the steady output of the steam feed pump; and calculating deviation of the load in real time by utilizing the lead-lag functional block, and judging that the load is reduced.
The automatic steps in the load rising process are as follows:
sending a full-open instruction of a recirculation door of the water pump turbine;
the full-open feedback signal of the recirculation door of the water feeding pump turbine triggers a gate hanging instruction of the water feeding pump turbine;
the water supply pump turbine is informed of a brake feedback signal, and a full-open command of an electric door at an inlet and an outlet of the steam supply pump is sent;
the feedback signal of the rotating speed 3000r/min of the water feeding pump turbine is sent, and the rotating speed of the steam feeding pump is continuously and automatically increased according to the speed of 300 r/min;
when the outlet pressure of the steam-driven water supply pump is increased to be less than 0.5MPa, automatically monitoring whether the opening degree of a recirculation door of the steam-driven water supply pump is more than 10%, if not, automatically slowly opening the steam-driven water supply pump to recirculate to 10%, and if so, keeping the original opening degree unchanged;
the water feeding pump turbine continues to increase the rotating speed, and when the outlet pressure of the water feeding pump turbine is larger than the outlet pressure of the electric water feeding pump, the inlet flow of the water feeding pump turbine is larger than the water feeding flow and the inlet flow of the electric water feeding pump is smaller than the water feeding flow, the automatic water feeding pump turbine is automatic, and the automatic water feeding pump is automatic;
the recirculation of the motor-driven water feed pump is fully started at a certain speed, the rotating speed is reduced to 3100r/min, and the recirculation of the motor-driven water feed pump is reduced to 0 at a certain speed;
the rotation speed of the electric water supply pump is reduced to 3100r/min, and the time delay is 2 minutes, so that an order for stopping the electric water supply pump can be automatically generated;
and stopping the electric water supply pump, and normally connecting the load to the steam water supply pump.
The automatic steps in the load reduction process are as follows:
generating a full-open instruction of a recirculation door of the electric water supply pump;
the full-open feedback of the recirculation door of the electric feed pump is generated, the electric feed pump is automatically started according to a full-open instruction of the inlet door of the electric feed pump, the speed of the electric feed pump is delayed for 15s, when the outlet pressure of the electric feed pump is increased to be less than 0.5MPa, whether the opening of the recirculation door of the electric feed pump is more than 10% or not is automatically monitored, otherwise, the electric feed pump is automatically and slowly started to be recirculated to 10% or not, and if the opening is more than 10%, the original opening is maintained unchanged;
the electric water supply pump continues to increase the rotating speed, and when the outlet pressure of the electric water supply pump is larger than the outlet pressure of the pneumatic water supply pump, the inlet flow of the electric water supply pump is larger than the water supply flow and the inlet flow of the pneumatic water supply pump is smaller than the water supply flow, the electric water supply pump is automatically put into operation, and meanwhile the pneumatic water supply pump is automatically cut off;
starting a steam feed pump at a certain speed for recirculation, and simultaneously reducing the rotating speed to 3100r/min;
maintaining the rotating speed of the steam feed pump at 3100r/min for 3 minutes, and sending a brake-off instruction of the steam feed pump;
the motor-driven water feeding pump stops running, and the motor-driven water feeding pump is connected with lower load.
The automatic control of the recirculation door of the pneumatic feed pump is as follows: when the recirculation of the steam-driven water feed pump is in an automatic state, the inlet flow of the steam-driven water feed pump is regulated and ensured to be larger than the minimum flow; when the opening of the recirculation valve is smaller than 10% in the automatic state for 2 minutes after the recirculation of the steam-driven water supply pump, automatically opening the recirculation valve to 10% when the inlet flow of the steam-driven water supply pump is smaller than the minimum flow at the current rotating speed;
recirculation auto off: after the opening of the steam-driven water supply pump is smaller than 10% in an automatic state for 2 minutes, when the inlet flow of the steam-driven water supply pump is larger than the minimum flow of 50t/h at the current rotating speed, delaying for 60 seconds, and completely closing the recirculation;
recirculation is automatically on: when the inlet flow of the steam feed pump is smaller than 17% of rated steam flow and the opening is smaller than 10% for 2 minutes, automatically opening the recirculation door to 10%, and if the inlet flow is larger than 10%, maintaining the original opening.
The automatic control of the recirculation door of the electric feed pump is as follows: when the recirculation of the electric feed pump is in an automatic state, the inlet flow of the steam feed pump is regulated and ensured to be larger than the minimum flow; when the opening of the recirculation of the electric water supply pump is smaller than 10% for 2 minutes in an automatic state, automatically opening the recirculation door to 10% when the inlet flow of the electric water supply pump is smaller than the minimum flow at the current rotating speed;
the recycling door is automatically closed: when the opening of the recirculation of the electric water supply pump is smaller than 10% for 2 minutes in an automatic state, and when the inlet flow of the electric water supply pump is larger than the minimum flow of 50t/h at the current rotating speed, delaying for 60 seconds, and completely closing the recirculation;
the recycling door is automatically closed: when the inlet flow of the electric feed water pump is smaller than 17% of rated steam flow and the opening is smaller than 10% for 2 minutes, automatically opening the recirculation door to 10%, and if the inlet flow is larger than 10%, maintaining the original opening.
The method also comprises the optimized control of the steam source of the steam feed pump, and when the main steam flow is lower than 40% of rated main steam flow:
the auxiliary steam header supplies the deaerator electric door to be a full-open instruction;
sending an automatic command for adjusting door throwing;
the reheat steam of the cooling section is supplied for the full-open instruction of the electric door of the auxiliary steam header;
the reheat steam of the cooling section is supplied to an auxiliary steam header to adjust a door throwing automatic instruction;
the main engine is turned off to supply water to the steam extraction section of the water pump steam turbine for the electric door of the deaerator;
the main engine is turned off to supply the steam extraction section of the water pump steam turbine to the auxiliary steam header electric door;
when the main steam flow is greater than 46% of rated main steam flow, the main machine is automatically started to supply the water pump turbine steam extraction section for the deaerator electric door.
The system also comprises a steam feed pump and an electric feed pump for recycling protection control;
the protection control of the pneumatic water supply pump means that: the minimum flow of the pneumatic water supply pump is protected from falling off, and the following conditions are met, and the delay is triggered for 30 seconds:
1) The steam feed pump operates;
2) The inlet flow of the steam feed pump is smaller than the minimum flow at the current rotating speed;
3) The opening degree of the recirculation door of the steam feed pump is less than 3 percent;
the recirculation protection control of the electric water supply pump is as follows: the minimum flow of the motor-driven water supply pump is protected from falling off, and the following conditions are met, and the motor-driven water supply pump is triggered by 30 seconds:
1) The electric water supply pump operates;
2) The inlet flow of the electric water supply pump is smaller than the minimum flow at the current rotating speed;
3) The recirculation door opening is less than 3%.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a control method for automatically switching an electric water supply pump in a load lifting process, automatically switching the electric water supply pump in a load reducing process, interlocking a brake-off of the electric water supply pump under a high-load working condition, interlocking the brake-off of the electric water supply pump under a low-load working condition, optimally controlling the steam source of the electric water supply pump and protecting the recirculation of the water supply pump.
The control method can effectively improve the influence of unstable driving steam sources on the low-load section of the steam feed pump in the prior art; but also can ensure the economical efficiency of the unit operation. Meanwhile, an automatic rewinding and pumping spring piece is arranged, and an automatic step sequence is started, so that the water pump can adapt to deep peak shaving for automatic switching control.
Drawings
FIG. 1 is a schematic diagram of a feed pump configuration of the present invention;
description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A water supply pump control method based on deep peak shaving comprises load rising process control and load falling process control,
1) In the load lifting process, when the condition of automatically triggering the pump reversing is met, an automatic step sequence is started, and the motor-driven water supply pump automatically switches the motor-driven water supply pump; the automatic triggering pump reversing condition is as follows:
a. the electric water supply pump is automatically started;
b. the current load of the unit is 80% greater than the design capacity of the electric water supply pump;
c. and (3) calculating deviation of the load in real time by utilizing the lead-lag functional block, judging that the load is increased, and delaying for 3 minutes, namely, the load is increased within 3 minutes.
2) In the load reduction process, when the condition of automatically triggering the pump reversing is met, an automatic step sequence is started, and the motor-driven water supply pump is automatically switched by the steam-driven water supply pump; the automatic triggering pump reversing condition is as follows:
a. automatic pumping of the pneumatic water supply pump;
b. the real-time load is lower than the steady output of the steam feed pump (the difference exists in different configuration steam sources of each unit, and the unit configuration is used for determining);
c. and (3) calculating deviation of the load in real time by utilizing the lead-lag functional block, judging that the load is reduced, and delaying for 3 minutes, namely, the load is reduced within 3 minutes.
Further, the automatic step sequence of the rising load electric water supply pump and the inverting steam water supply pump is as follows:
1) Sending a full-open instruction of a recirculation door of the water pump turbine;
2) The full-open feedback signal of the recirculation door of the water feeding pump turbine triggers a gate hanging instruction of the water feeding pump turbine;
3) The feed pump turbine is subjected to brake-hanging feedback signal transmission, a full-open command of an electric door at an inlet and an outlet of the steam feed pump is transmitted, and the rotating speed is automatically increased to 3000r/min at a speed of 200 r/min;
4) The feedback signal of the rotating speed 3000r/min (running of the steam feed pump) of the steam turbine of the feed pump is sent, and the steam feed pump continuously and automatically increases the rotating speed at the speed of 300 r/min;
5) When the outlet pressure of the steam-driven water supply pump is increased to be less than 0.5MPa (the outlet pressure of the steam-driven water supply pump is less than 0.5 MPa) than that of the electric water supply pump, automatically monitoring whether the opening degree of a recirculation door of the electric water supply pump is more than 10%, otherwise, automatically slowly opening the electric water supply pump to recirculate to 10%, and if the opening degree is more than 10%, maintaining the original opening degree unchanged.
6) The water feeding pump turbine continues to increase the rotating speed, and when the outlet pressure of the water feeding pump turbine is larger than the outlet pressure of the electric water feeding pump, the inlet flow of the water feeding pump turbine is larger than the water feeding flow and the inlet flow of the electric water feeding pump is smaller than the water feeding flow, the automatic water feeding pump turbine is automatic, and the automatic water feeding pump is automatic;
7) The recirculation of the motor-driven water feed pump is fully started at a certain speed, the rotating speed is reduced to 3100r/min, and the recirculation of the motor-driven water feed pump is reduced to 0 at a certain speed;
8) The rotation speed of the electric water supply pump is reduced to 3100r/min, and the time delay is 2 minutes, so that an order for stopping the electric water supply pump can be automatically generated;
9) The electric pump is stopped, and the steam pump is normally connected with load.
Further, the automatic step sequence of the motor-driven water supply pump is that the motor-driven water supply pump is reversed:
1) Generating a full-open instruction of a recirculation door of the electric water supply pump;
2) The full-open feedback of the recirculation door of the electric feed pump is generated, the electric feed pump is automatically started according to a full-open instruction of the inlet door of the electric feed pump, the speed of the electric feed pump is delayed for 15s, when the outlet pressure of the electric feed pump is increased to be less than 0.5MPa (the outlet pressure of the electric feed pump is less than 0.5 MPa) of the outlet pressure of the pneumatic feed pump, whether the opening degree of the recirculation door of the pneumatic feed pump is more than 10% is automatically monitored, if not, the automatic slow-open recirculation of the pneumatic feed pump is carried out to 10%, and if the opening degree is more than 10%, the original opening degree is maintained unchanged;
3) The electric water supply pump continues to increase the rotating speed, and when the outlet pressure of the electric water supply pump is larger than the outlet pressure of the pneumatic water supply pump, the inlet flow of the electric water supply pump is larger than the water supply flow and the inlet flow of the pneumatic water supply pump is smaller than the water supply flow, the electric water supply pump is automatically put into operation, and meanwhile the pneumatic water supply pump is automatically cut off;
4) Starting a steam feed pump at a certain speed for recirculation, and simultaneously reducing the rotating speed to 3100r/min;
5) Maintaining the rotating speed of the steam feed pump at 3100r/min for 3 minutes, and sending a brake-off instruction of the steam feed pump;
6) The pneumatic water supply pump is stopped, and the electric pump is connected with lower load.
Further, the steam feed pump drops the gate and locks the logic
1) The electric water supply pump is connected, the electric water supply pump is put into automatic operation after time delay of 10s, the rotating speed is automatically increased, and the target value is the water supply flow corresponding to the main steam flow. Meanwhile, when the water supply flow reaches 150t/h, the water supply is recycled to 10% at the fastest speed, and when the water supply flow reaches 250t/h, the water supply is recycled to 0% at the fastest speed;
2) When the main steam flow is 600t/h or more, the steam feed pump is turned off, and the machine furnace coordinates wind reduction, coal reduction and load reduction at the speed of 30 WM/min; when the main steam flow is 600t or less, the steam feed pump is turned off, only the related operation of the electric feed pump is executed, and the wind reduction, the coal reduction and the load reduction are not executed;
further, the steam source of the steam feed pump is optimally controlled
When the main steam flow is lower than 40% of rated main steam flow:
1) The auxiliary steam header supplies the deaerator electric door to be a full-open instruction;
2) Sending an automatic command for adjusting door throwing;
3) The reheat steam of the cooling section is supplied for the full-open instruction of the electric door of the auxiliary steam header;
4) The reheat steam of the cooling section is supplied to an auxiliary steam header to adjust a door throwing automatic instruction;
5) The main engine is turned off to supply water to the steam extraction section of the water pump steam turbine for the electric door of the deaerator;
6) The main engine is turned off to supply the steam extraction section of the water pump steam turbine to the auxiliary steam header electric door.
When the main steam flow is greater than 46% of rated main steam flow, the main machine is automatically started to supply the water pump turbine steam extraction section for the deaerator electric door.
Further, the recirculation protection optimization of the steam feed pump and the electric feed pump
The minimum flow of the pneumatic water supply pump is protected from falling off, and the following conditions are met, and the delay is triggered for 30 seconds:
1) The steam feed pump operates;
2) The inlet flow of the pneumatic feed water pump is smaller than the minimum flow at the current rotating speed (218 tons corresponds to the highest rotating speed 6200, and the minimum flow is converted by the current rotating speed/6200);
3) The opening degree of the recirculation door of the pneumatic feed pump is less than 3 percent.
The minimum flow of the motor-driven water supply pump is protected from falling off, and the following conditions are met, and the motor-driven water supply pump is triggered by 30 seconds:
1) The electric water supply pump operates;
2) The inlet flow of the electric water supply pump is smaller than the minimum flow at the current rotating speed (276 tons corresponds to the highest rotating speed 6200, and the minimum flow is converted by the current rotating speed/6200);
3) The recirculation door opening is less than 3%.
Further, the automatic control of the recirculation door of the pneumatic water supply pump
And when the recirculation of the steam feed pump is in an automatic state, the inlet flow of the steam feed pump is regulated and ensured to be larger than the minimum flow.
When the opening of the recirculation of the steam-driven water supply pump is smaller than 10% for 2 minutes in an automatic state, and when the inlet flow of the steam-driven water supply pump is smaller than the minimum flow at the current rotating speed, the recirculation door is automatically opened to 10%. (implementation of the recycle door in the automatic position)
Recirculation auto off: and when the opening of the recirculation of the steam pump is smaller than 10% for 2 minutes in an automatic state and the inlet flow of the steam feed pump is larger than the minimum flow of 50t/h at the current rotating speed, the recirculation is delayed for 60 seconds and is totally closed. (implementation of the recycle door in the automatic position)
Recirculation is automatically on: when the inlet flow of the steam feed pump is smaller than 17% of rated steam flow and the opening is smaller than 10% for 2 minutes, the recirculation door is automatically opened to 10%, and if the opening is already larger than 10%, the original opening is maintained (the condition does not judge whether the recirculation door is in an automatic position or a manual position).
Further, automatic control of recirculation door of electric water supply pump
And when the recirculation of the electric feed pump is in an automatic state, the inlet flow of the steam feed pump is regulated and ensured to be larger than the minimum flow.
When the opening of the recirculation of the electric water supply pump is smaller than 10% for 2 minutes in an automatic state, and when the inlet flow of the electric water supply pump is smaller than the minimum flow at the current rotating speed, the recirculation door is automatically opened to 10%. (implementation of the recycle door in the automatic position)
The recycling door is automatically closed: and when the opening degree of the recirculation of the electric water supply pump is smaller than 10% for 2 minutes in an automatic state, and when the inlet flow of the electric water supply pump is larger than the minimum flow of 50t/h at the current rotating speed, the recirculation is delayed for 60 seconds and is totally closed. (implementation of the recycle door in the automatic position)
The recycling door is automatically closed: when the inlet flow of the electric feed water pump is smaller than 17% of rated steam flow and the opening is smaller than 10% for 2 minutes, the recirculation door is automatically opened to 10%, and if the opening is larger than 10%, the original opening is maintained (the condition does not judge whether the recirculation door is in an automatic position or a manual position).
The preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention, and the various changes are included in the scope of the present invention.
Claims (5)
1. A water supply pump control method based on deep peak shaving is characterized by comprising load rising process control and load falling process control,
1) In the load lifting process, when the condition of automatically triggering the pump reversing is met, an automatic step sequence is started, and the motor-driven water supply pump automatically switches the motor-driven water supply pump; the automatic triggering pump reversing condition is as follows: the electric water supply pump is automatically started; the current load of the unit is 80% greater than the design capacity of the electric water supply pump; calculating deviation of the load in real time by utilizing the lead-lag functional block, and judging that the load is increasing;
the automatic steps in the load rising process are as follows:
sending a full-open instruction of a recirculation door of the water pump turbine;
the full-open feedback signal of the recirculation door of the water feeding pump turbine triggers a gate hanging instruction of the water feeding pump turbine;
the water supply pump turbine is informed of a brake feedback signal, and a full-open command of an electric door at an inlet and an outlet of the steam supply pump is sent;
the feedback signal of the rotating speed 3000r/min of the water feeding pump turbine is sent, and the rotating speed of the steam feeding pump is continuously and automatically increased according to the speed of 300 r/min;
when the outlet pressure of the steam-driven water supply pump is increased to be less than 0.5MPa, namely, the outlet pressure of the steam-driven water supply pump is less than 0.5MPa, automatically monitoring whether the opening of a recirculation door of the steam-driven water supply pump is more than 10%, otherwise, automatically slowly opening the steam-driven water supply pump to recirculate to 10%, and if the opening is more than 10%, maintaining the original opening unchanged;
the water feeding pump turbine continues to increase the rotating speed, and when the outlet pressure of the water feeding pump turbine is larger than the outlet pressure of the electric water feeding pump, the inlet flow of the water feeding pump turbine is larger than the water feeding flow and the inlet flow of the electric water feeding pump is smaller than the water feeding flow, the automatic water feeding pump turbine is automatic, and the automatic water feeding pump is automatic;
the recirculation of the motor-driven water feed pump is fully started at a certain speed, the rotating speed is reduced to 3100r/min, and the recirculation of the motor-driven water feed pump is reduced to 0 at a certain speed;
the rotation speed of the electric water supply pump is reduced to 3100r/min, and the time delay is 2 minutes, so that an order for stopping the electric water supply pump can be automatically generated;
stopping the electric water supply pump, and normally connecting the load to the steam water supply pump;
2) In the load reduction process, when the condition of automatically triggering the pump reversing is met, an automatic step sequence is started, and the motor-driven water supply pump is automatically switched by the steam-driven water supply pump; the automatic triggering pump reversing condition is as follows: automatic pumping of the pneumatic water supply pump; the real-time load is lower than the steady output of the steam feed pump; calculating deviation of the load in real time by utilizing a lead-lag functional block, and judging that the load is reduced;
the automatic steps in the load reduction process are as follows:
generating a full-open instruction of a recirculation door of the electric water supply pump;
the full-open feedback of the recirculation door of the electric feed pump is generated, the electric feed pump is automatically started according to a full-open instruction of the inlet door of the electric feed pump, the electric feed pump is delayed for 15s, the rotation speed is increased, when the outlet pressure of the electric feed pump is increased to be less than 0.5MPa, namely, the outlet pressure of the electric feed pump is less than 0.5MPa, whether the opening degree of the recirculation door of the electric feed pump is more than 10% is automatically monitored, if not, the electric feed pump is automatically and slowly started to be recirculated to 10%, and if the opening degree is more than 10%, the original opening degree is maintained unchanged;
the electric water supply pump continues to increase the rotating speed, and when the outlet pressure of the electric water supply pump is larger than the outlet pressure of the pneumatic water supply pump, the inlet flow of the electric water supply pump is larger than the water supply flow and the inlet flow of the pneumatic water supply pump is smaller than the water supply flow, the electric water supply pump is automatically put into operation, and meanwhile the pneumatic water supply pump is automatically cut off;
starting a steam feed pump at a certain speed for recirculation, and simultaneously reducing the rotating speed to 3100r/min;
maintaining the rotating speed of the steam feed pump at 3100r/min for 3 minutes, and sending a brake-off instruction of the steam feed pump;
the motor-driven water feeding pump stops running, and the motor-driven water feeding pump is connected with lower load.
2. The method for controlling a water feed pump based on depth peaking according to claim 1, wherein the automatic control of the recirculation gate of the pneumatic water feed pump is: when the recirculation of the steam-driven water feed pump is in an automatic state, the inlet flow of the steam-driven water feed pump is regulated and ensured to be larger than the minimum flow; when the opening of the recirculation valve is smaller than 10% in the automatic state for 2 minutes after the recirculation of the steam-driven water supply pump, automatically opening the recirculation valve to 10% when the inlet flow of the steam-driven water supply pump is smaller than the minimum flow at the current rotating speed;
recirculation auto off: after the opening of the steam-driven water supply pump is smaller than 10% in an automatic state for 2 minutes, when the inlet flow of the steam-driven water supply pump is larger than the minimum flow of 50t/h at the current rotating speed, delaying for 60 seconds, and completely closing the recirculation;
recirculation is automatically on: when the inlet flow of the steam feed pump is smaller than 17% of rated steam flow and the opening is smaller than 10% for 2 minutes, automatically opening the recirculation door to 10%, and if the inlet flow is larger than 10%, maintaining the original opening.
3. The method for controlling a water feed pump based on depth peaking according to claim 1, wherein the automatic control of the recirculation door of the electric water feed pump is as follows: when the recirculation of the electric feed pump is in an automatic state, the inlet flow of the steam feed pump is regulated and ensured to be larger than the minimum flow; when the opening of the recirculation of the electric water supply pump is smaller than 10% for 2 minutes in an automatic state, automatically opening the recirculation door to 10% when the inlet flow of the electric water supply pump is smaller than the minimum flow at the current rotating speed;
the recycling door is automatically closed: when the opening of the recirculation of the electric water supply pump is smaller than 10% for 2 minutes in an automatic state, and when the inlet flow of the electric water supply pump is larger than the minimum flow of 50t/h at the current rotating speed, delaying for 60 seconds, and completely closing the recirculation;
the recycling door is automatically closed: when the inlet flow of the electric feed water pump is smaller than 17% of rated steam flow and the opening is smaller than 10% for 2 minutes, automatically opening the recirculation door to 10%, and if the inlet flow is larger than 10%, maintaining the original opening.
4. The depth peaking-based feedwater pump control method of claim 1, further comprising steam source optimization control of the steam feedwater pump when the main steam flow is below 40% rated main steam flow:
the auxiliary steam header supplies the deaerator electric door to be a full-open instruction;
sending an automatic command for adjusting door throwing;
the reheat steam of the cooling section is supplied for the full-open instruction of the electric door of the auxiliary steam header;
the reheat steam of the cooling section is supplied to an auxiliary steam header to adjust a door throwing automatic instruction;
the main engine is turned off to supply water to the steam extraction section of the water pump steam turbine for the electric door of the deaerator;
the main engine is turned off to supply the steam extraction section of the water pump steam turbine to the auxiliary steam header electric door;
when the main steam flow is greater than 46% of rated main steam flow, the main machine is automatically started to supply the water pump turbine steam extraction section for the deaerator electric door.
5. The depth peaking-based water feed pump control method of claim 1, further comprising a steam feed pump recirculation protection control and an electric feed pump recirculation protection control;
the protection control of the pneumatic water supply pump means that: the minimum flow of the pneumatic water supply pump is protected from falling off, and the following conditions are met, and the delay is triggered for 30 seconds:
1) The steam feed pump operates;
2) The inlet flow of the steam feed pump is smaller than the minimum flow at the current rotating speed;
3) The opening degree of the recirculation door of the steam feed pump is less than 3 percent;
the recirculation protection control of the electric water supply pump is as follows: the minimum flow of the motor-driven water supply pump is protected from falling off, and the following conditions are met, and the motor-driven water supply pump is triggered by 30 seconds:
1) The electric water supply pump operates;
2) The inlet flow of the electric water supply pump is smaller than the minimum flow at the current rotating speed;
3) The recirculation door opening is less than 3%.
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| CN103791485A (en) * | 2014-02-28 | 2014-05-14 | 国家电网公司 | Optimal control method of water supply system of thermal power generating unit |
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| CN103791485A (en) * | 2014-02-28 | 2014-05-14 | 国家电网公司 | Optimal control method of water supply system of thermal power generating unit |
| CN110397909A (en) * | 2019-08-20 | 2019-11-01 | 华能国际电力股份有限公司 | Water supply feedforward control system and method based on feed pump recycle valve state |
| CN111503620A (en) * | 2020-03-27 | 2020-08-07 | 扬州第二发电有限责任公司 | Water supply whole-course control system suitable for deep peak shaving of coal-fired unit |
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