CN110645062A - Double-machine regenerative system participating in primary frequency modulation and operation method thereof - Google Patents

Double-machine regenerative system participating in primary frequency modulation and operation method thereof Download PDF

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Publication number
CN110645062A
CN110645062A CN201911055642.0A CN201911055642A CN110645062A CN 110645062 A CN110645062 A CN 110645062A CN 201911055642 A CN201911055642 A CN 201911055642A CN 110645062 A CN110645062 A CN 110645062A
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steam
heater
pressure
group
turbine
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CN201911055642.0A
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Chinese (zh)
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常龙辉
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Datang Yuncheng Power Generation Co Ltd
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Datang Yuncheng Power Generation Co Ltd
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Priority to CN201911055642.0A priority Critical patent/CN110645062A/en
Publication of CN110645062A publication Critical patent/CN110645062A/en
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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
    • 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
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • 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
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/345—Control or safety-means particular thereto
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/40—Use of two or more feed-water heaters in series
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/44—Use of steam for feed-water heating and another purpose

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Turbines (AREA)

Abstract

The invention provides a double-machine regenerative system participating in primary frequency modulation and an operation method thereof, wherein the operation method comprises the following steps: step 1, setting a primary load value and a secondary load value at a control device; step 2, when the power grid frequency drops and exceeds a primary load numerical value, the control device triggers and cuts off an instruction of one group of high-pressure heaters, the steam extraction amount of the high-pressure heaters is reduced, the load is increased, and the function of increasing the load by primary frequency modulation is realized; and 3, after the frequency of the power grid is recovered, the control device enables the high-voltage heater to recover to an initial running state, so that the method has the advantage of realizing the function of quickly loading the primary frequency modulation.

Description

Double-machine regenerative system participating in primary frequency modulation and operation method thereof
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a double-machine regenerative system participating in primary frequency modulation and an operation method thereof.
Background
At present, with the continuous improvement of the high-temperature performance of materials, the steam parameters of a coal-fired power generating unit are continuously improved so as to obtain higher cycle efficiency, further reduce the coal consumption of the unit and reduce the emission of greenhouse gases and other pollutants. Improving steam parameters is one of the most direct ways to improve the cycle efficiency of the power generation system.
With the continuous development of the power industry, the power generation proportion of new energy sources such as wind power and solar energy is increased year by year, but the adjustability of new energy power sources is poor, the power of a connecting line between power grids is high, and once the power is tripped, the load of a receiving-end power grid power source needs to be increased rapidly. For the reasons, the power grid has higher and higher requirements on the primary frequency modulation quality and the load regulation capacity of the unit. The large-capacity turbine set adopts double reheating, the reheating volume is large, the load regulation is slow, and the large-capacity turbine generally has no regulation stage and adopts throttling steam distribution. Compared with the regulation-level nozzle steam distribution, the throttling steam distribution can improve the operation efficiency of the unit under the rated working condition, and the unit proportion of the throttling steam distribution in a large-capacity thermal power unit is increased continuously in future. The most economical way of operating such units is for the high pressure governor to operate with full opening sliding pressure. However, the capacity that the adjusting door is opened fully, namely the adjusting door is lost to be opened continuously to increase the load of the unit rapidly, and how to meet the performance requirement of power grid dispatching on the primary frequency modulation of the unit is a great problem. Particularly, under the background of the current extra-high voltage power grid and large-scale direct current transmission, once the power supply load of a power receiving end is lost due to the fault of a power transmission line, the frequency of the power grid is rapidly reduced, and the load of a local unit is required to be rapidly increased to realize the primary frequency modulation function, so that a large contradiction exists between the economic operation mode and the primary frequency modulation capability of the throttling steam distribution units.
However, as the steam parameter is improved, the superheat degree of the regenerative extraction steam is increased, the irreversible loss of heat exchange between the steam side and the water side in the regenerative heater is increased, the gain caused by the increase of the steam parameter is weakened, and the higher the steam parameter is, the more the contradiction is prominent. Meanwhile, in order to reduce throttling loss, the turbine regulating valve is nearly fully opened, in order to meet the performance requirement of primary frequency modulation, the high-pressure regulating valve has to be closed, a regulating valve throttling operation mode is adopted, great economical efficiency is sacrificed, and especially under low load, the throttling loss of the regulating valve is larger.
Disclosure of Invention
The invention provides a double-machine regenerative system participating in primary frequency modulation and an operation method thereof, which not only reduces the possibility of over-fast increase of the steam extraction superheat degree of a machine set, but also can realize the function of fast loading of the primary frequency modulation.
The technical scheme of the invention is realized as follows: a double-machine regenerative system participating in primary frequency modulation comprises a boiler, a power generation device, a condenser, a regenerative device and a control device;
the boiler comprises a first steam outlet and a second steam outlet;
the power generation device comprises a main steam turbine generator set and a small steam turbine generator set, wherein the main steam turbine generator set comprises a main steam turbine and a main generator, one end of the main steam turbine is coaxially connected with the main generator, the small steam turbine generator set comprises a backheating type small steam turbine, a water feeding pump and a small motor, one end of the backheating type small steam turbine is coaxially connected with the water feeding pump, the other end of the backheating type small steam turbine is coaxially connected with the small motor, a steam inlet of the backheating type small steam turbine is communicated with a steam outlet of the main steam turbine, a steam extraction port is arranged on the backheating type small steam turbine, and the steam extraction port is communicated with a steam inlet of the backheating device;
the heat recovery device comprises a low-pressure heater, a deaerator and a high-pressure heater, wherein a water inlet of the low-pressure heater is communicated with a water outlet of the condenser, a water outlet of the low-pressure heater is communicated with a water inlet of the deaerator, a water inlet of the high-pressure heater is communicated with a water outlet of the deaerator, a water outlet of the high-pressure heater is communicated with a water inlet of the boiler, the high-pressure heaters are arranged from high to low according to thermal parameters and are sequentially numbered as A group high-pressure heaters, the high-pressure water heater comprises a group B high-pressure heater and a group C high-pressure heater, wherein a first water side bypass is arranged on one side of the group A high-pressure heater, a first regulating valve is arranged on the first water side bypass, a second water side bypass is arranged on one side of the group B high-pressure heater, a second regulating valve is arranged on the second water side bypass, a third water side bypass is arranged on one side of the group C high-pressure heater, and a third regulating valve is arranged on the third water side bypass.
The control device is electrically connected with the first regulating valve, the second regulating valve and the third regulating valve.
The invention can lead the water supply not to pass through the high-pressure heater by cutting off the high-pressure heater, thereby releasing the energy storage of the steam extraction of the high-pressure heater.
As a preferred embodiment, the group a high-pressure heater comprises a heater No. 1 and a heater No. 2, wherein a first water stop valve is arranged on one side of the heater No. 2, and the first water stop valve is electrically connected with the control device;
the group B high-pressure heater comprises a No. 3 heater and a No. 4 heater, wherein a second water stop valve is arranged on one side of the No. 4 heater and is electrically connected with the control device;
the group C high-pressure heater comprises a No. 5 heater and a No. 6 heater, wherein a third water stop valve is arranged on one side of the No. 6 heater, and the third water stop valve is electrically connected with the control device.
As a preferred embodiment, the main turbine includes a turbine ultra-high pressure cylinder, a turbine intermediate pressure cylinder, and a turbine low pressure cylinder;
the steam inlet of the turbine ultrahigh-pressure cylinder is communicated with the first steam outlet of the boiler, the steam outlet of the turbine ultrahigh-pressure cylinder is respectively communicated with the steam inlet of the boiler, the steam inlet of the No. 1 heater and the steam inlet of the backheating type small turbine, the steam inlet of the turbine high-pressure cylinder is communicated with the second steam outlet of the boiler, the steam outlet of the turbine high-pressure cylinder is communicated with the steam inlet of the turbine medium-pressure cylinder, the steam inlet of the turbine low-pressure cylinder is communicated with the steam outlet of the turbine medium-pressure cylinder, and the steam outlet of the turbine low-pressure cylinder is communicated with the steam inlet of the condenser.
As a preferred embodiment, the steam extraction ports include a No. 1 steam extraction port, a No. 2 steam extraction port, a No. 3 steam extraction port, a No. 4 steam extraction port, a No. 5 steam extraction port, and a No. 6 steam extraction port;
the steam extraction port No. 1 is communicated with the steam inlet of the heater No. 2, a first check valve is arranged between the steam extraction port No. 1 and the heater No. 2, and the first check valve is electrically connected with the control device;
the steam extraction port No. 2 is communicated with the steam inlet of the heater No. 3, a second check valve is arranged between the steam extraction port No. 2 and the heater No. 3, and the second check valve is electrically connected with the control device;
the No. 3 steam extraction port is communicated with the steam inlet of the No. 4 heater, a third check valve is arranged between the No. 3 steam extraction port and the No. 4 heater, and the third check valve is electrically connected with the control device;
the No. 4 steam extraction port is communicated with the steam inlet of the No. 5 heater, a fourth check valve is arranged between the No. 4 steam extraction port and the No. 5 heater, and the fourth check valve is electrically connected with the control device;
the No. 5 steam extraction port is communicated with the steam inlet of the No. 6 heater, a fifth check valve is arranged between the No. 5 steam extraction port and the No. 6 heater, and the fifth check valve is electrically connected with the control device;
the No. 6 steam extraction port is communicated with a steam inlet of the deaerator.
In a preferred embodiment, the exhaust port of the small regenerative turbine is respectively communicated with the steam inlet of the low-pressure heater and the steam inlet of the condenser.
An operation method of a double-machine regenerative system participating in primary frequency modulation comprises the following steps:
step 1, setting a primary load value and a secondary load value at a control device;
step 2, when the power grid frequency drops and exceeds a primary load numerical value, the control device triggers and cuts off an instruction of one group of high-pressure heaters, the steam extraction amount of the high-pressure heaters is reduced, the load is increased, and the function of increasing the load by primary frequency modulation is realized;
and 3, after the grid frequency is recovered, the control device enables the high-voltage heater to recover to an initial running state.
In a preferred embodiment, the primary load value in step 1 is 75% and the intermediate load value is 40%.
As a preferred embodiment, the command for cutting off one group of high-voltage heaters in the step 2 is to cut off the group B high-voltage heaters or cut off the group C high-voltage heaters;
when the B group of high-pressure heaters are cut off, the control device closes the second water stop valve and opens the second regulating valve, and meanwhile, the control device closes the second check valve and the third check valve;
when the C group high-pressure heater is cut off, the control device closes the third water stop valve and opens the third regulating valve, and meanwhile, the control device closes the third check valve and the fourth check valve.
As a preferred embodiment, the instruction for cutting off two groups of high-pressure heaters in step 2 is to cut off a group a high-pressure heaters and a group C high-pressure heaters or cut off a group B high-pressure heaters and a group C high-pressure heaters;
when the A group of high-pressure heaters and the C group of high-pressure heaters are cut off, the control device closes the first water stop valve and the third water stop valve, opens the first regulating valve and the third regulating valve, and closes the first check valve, the fourth check valve and the fifth check valve;
when the B group of high-pressure heaters and the C group of high-pressure heaters are cut off, the control device closes the second water stop valve and the third water stop valve, opens the second regulating valve and the third regulating valve, and closes the second check valve, the third check valve, the fourth check valve and the fifth check valve.
As a preferred embodiment, the high pressure heaters in step 3 are returned to the initial operating state, that is, the group a high pressure heaters, the group B high pressure heaters and the group C high pressure heaters are all put into operation.
After the technical scheme is adopted, the invention has the beneficial effects that:
1. the invention changes the exhaust from the turbine ultrahigh pressure cylinder into the small regenerative turbine, and the steam is extracted from the small regenerative turbine and is transmitted to the high pressure heater for heat supply, thereby reducing the possibility of increasing the superheat degree of the extracted steam too fast.
2. The invention can lead the water supply not to pass through the high-pressure heater by cutting off the high-pressure heater, thereby releasing the energy storage of the steam extraction of the high-pressure heater and realizing the function of quick load application of primary frequency modulation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the high-pressure heater.
In the figure, 1-boiler; 2-a turbine ultrahigh pressure cylinder; 3-a high-pressure cylinder of the steam turbine; 4-a turbine medium pressure cylinder; 5-low pressure cylinder of steam turbine; 6-a main generator; 7-a backheating type small steam turbine; 8-small motor; 9-a deaerator; 10-a low pressure heater; heater No. 11-1; heater No. 12-2; heater number 13-3; heater number 14-4; heater No. 15-5; heater number 16-6; no. 17-1 steam extraction port; no. 18-2 steam extraction port; a No. 19-3 steam extraction port; a No. 20-4 steam extraction port; no. 21-5 steam extraction port; no. 22-6 steam extraction port; 23-a first non-return valve; 24-a second check valve; 25-a third check valve; 26-a fourth check valve; 27-a fifth check valve; 28-a first waterside bypass; 29-a first regulating valve; 30-a first water stop valve; 31-a second waterside bypass; 32-a second regulating valve; 33-a second water stop valve; 34-a third regulating valve; 35-a third waterside bypass; 36-a third water stop valve; 37-condenser.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, an operation method of a dual-machine regenerative system participating in primary frequency modulation includes the following steps:
step 1, setting a primary load value and a secondary load value at a control device;
step 2, when the power grid frequency drops and exceeds a primary load numerical value, the control device triggers and cuts off an instruction of one group of high-pressure heaters, the steam extraction amount of the high-pressure heaters is reduced, the load is increased, and the function of increasing the load by primary frequency modulation is realized;
and 3, after the grid frequency is recovered, the control device enables the high-voltage heater to recover to an initial running state.
The double-machine regenerative system comprises a boiler 1, a power generation device, a condenser 37, a regenerative device and a control device;
the boiler 1 comprises a first steam outlet and a second steam outlet;
the power generation device comprises a main steam turbine generator set and a small steam turbine generator set, wherein the main steam turbine generator set comprises a main steam turbine and a main generator 6, one end of the main steam turbine is coaxially connected with the main generator 6, the small steam turbine generator set comprises a backheating type small steam turbine 7, a water feeding pump and a small motor 8, one end of the backheating type small steam turbine 7 is coaxially connected with the water feeding pump, the other end of the backheating type small steam turbine 7 is coaxially connected with the small motor 8, a steam inlet of the backheating type small steam turbine 7 is communicated with a steam outlet of the main steam turbine, a steam extraction port is arranged on the backheating type small steam turbine 7, and the steam extraction port is communicated with a steam inlet of the backheating device;
the heat recovery device comprises a low-pressure heater 10, a deaerator 9 and a high-pressure heater, wherein a water inlet of the low-pressure heater 10 is communicated with a water outlet of a condenser 37, a water outlet of the low-pressure heater 10 is communicated with a water inlet of the deaerator 9, a water inlet of the high-pressure heater is communicated with a water outlet of the deaerator 9, a water outlet of the high-pressure heater is communicated with a water inlet of a boiler 1, the high-pressure heaters are sequentially numbered as a group A high-pressure heater, a group B high-pressure heater and a group C high-pressure heater according to thermal parameters from high to low, a first water side bypass 28 is arranged on one side of the group A high-pressure heater, a first regulating valve 29 is arranged on the first water side bypass 28, a second water side bypass 31 is arranged on one side of the group B high-pressure heater, a second regulating valve 32 is arranged on, a third regulating valve 34 is provided on the third water-side bypass 35.
The control device is electrically connected to the first regulating valve 29, the second regulating valve 32 and the third regulating valve 34. The invention can lead the water supply not to pass through the high-pressure heater by cutting off the high-pressure heater, thereby releasing the energy storage of the steam extraction of the high-pressure heater.
The group A high-pressure heater comprises a No. 1 heater 11 and a No. 2 heater 12, wherein a first water stop valve 30 is arranged on one side of the No. 2 heater 12, and the first water stop valve 30 is electrically connected with the control device;
the group B high-pressure heater comprises a No. 3 heater 13 and a No. 4 heater 14, wherein a second water stop valve 33 is arranged on one side of the No. 4 heater 14, and the second water stop valve 33 is electrically connected with the control device;
the group C high-pressure heater comprises a No. 5 heater 15 and a No. 6 heater 16, wherein a third water stop valve 36 is arranged on one side of the No. 6 heater 16, and the third water stop valve 36 is electrically connected with the control device.
The first water stop valve 30 is arranged between the first water side bypass 28 and the No. 2 heater 12, the second water stop valve 33 is arranged between the second water side bypass 31 and the No. 4 heater 14, the third water stop valve 36 is arranged between the third water side bypass 35 and the No. 6 heater 16, the water inlet of the No. 6 heater 16 is communicated with the water outlet of the deaerator 9, and the water outlet of the No. 1 heater 11 is communicated with the water inlet of the boiler 1.
The main steam turbine comprises a steam turbine ultrahigh pressure cylinder 2, a steam turbine high pressure cylinder 3, a steam turbine medium pressure cylinder 4 and a steam turbine low pressure cylinder 5;
the steam inlet of the turbine ultrahigh-pressure cylinder 2 is communicated with the first steam outlet of the boiler 1, the steam outlet of the turbine ultrahigh-pressure cylinder 2 is respectively communicated with the steam inlet of the boiler 1, the steam inlet of the No. 1 heater 11 and the steam inlet of the small regenerative turbine 7, the steam inlet of the turbine high-pressure cylinder 3 is communicated with the second steam outlet of the boiler 1, the steam outlet of the turbine high-pressure cylinder 3 is communicated with the steam inlet of the turbine medium-pressure cylinder 4, the steam inlet of the turbine low-pressure cylinder 5 is communicated with the steam outlet of the turbine medium-pressure cylinder 4, and the steam outlet of the turbine low-pressure cylinder 5 is communicated with the steam inlet of the condenser 37.
The steam extraction openings comprise a No. 1 steam extraction opening 17, a No. 2 steam extraction opening 18, a No. 3 steam extraction opening 19, a No. 4 steam extraction opening 20, a No. 5 steam extraction opening 21 and a No. 6 steam extraction opening 22;
the steam extraction port 1 17 is communicated with the steam inlet of the heater 2 12, a first check valve 23 is arranged between the steam extraction port 1 17 and the heater 2, and the first check valve 23 is electrically connected with the control device;
the steam extraction port 2 18 is communicated with the steam inlet of the heater 3, a second check valve 24 is arranged between the steam extraction port 2 18 and the heater 3, and the second check valve 24 is electrically connected with the control device;
the steam extraction port 3 19 is communicated with the steam inlet of the heater 4, a third check valve 25 is arranged between the steam extraction port 3 19 and the heater 4, and the third check valve 25 is electrically connected with the control device;
the steam extraction port No. 4 20 is communicated with the steam inlet of the heater No. 5 15, a fourth check valve 26 is arranged between the steam extraction port No. 4 20 and the heater No. 5 15, and the fourth check valve 26 is electrically connected with the control device;
the steam extraction port 5 21 is communicated with the steam inlet of the heater 6, a fifth check valve 27 is arranged between the steam extraction port 5 21 and the heater 6, and the fifth check valve 27 is electrically connected with the control device;
the No. 6 steam extraction port 22 is communicated with a steam inlet of the deaerator 9.
The primary load value in step 1 was 75% and the medium load value was 40%.
In the step 2, cutting off one group of high-voltage heaters is performed by cutting off the group B high-voltage heaters or cutting off the group C high-voltage heaters; when the high-pressure heater of the group B is cut off, the control device closes the second water stop valve 33 and opens the second regulating valve 32, and simultaneously, the control device closes the second check valve 24 and the third check valve 25; when the group C high-pressure heater is cut off, the control device closes the third water stop valve 36 and opens the third regulating valve 34, and at the same time, the control device closes the third check valve 25 and the fourth check valve 26.
The instruction for cutting off the two groups of high-pressure heaters in the step 2 is to cut off the group A high-pressure heaters and the group C high-pressure heaters or cut off the group B high-pressure heaters and the group C high-pressure heaters; when the group a high-pressure heater and the group C high-pressure heater are cut off, the control device closes the first water stop valve 30 and the third water stop valve 36 and opens the first regulating valve 29 and the third regulating valve 34, and at the same time, the control device closes the first check valve 23, the fourth check valve 26 and the fifth check valve 27; when the B-group high-pressure heater and the C-group high-pressure heater are cut off, the control device closes the second and third water stop valves 33, 36 and opens the second and third regulating valves 32, 34, while the control device closes the second, third, fourth, and fifth check valves 24, 25, 26, 27.
And 3, restoring the high-pressure heater to the initial operation state, namely putting the A group of high-pressure heater, the B group of high-pressure heater and the C group of high-pressure heater into operation.
The invention adopts the economic mode of the full-open sliding pressure operation of the high-pressure regulating valve at ordinary times, when the frequency of the power grid is reduced and exceeds the primary load value, the control device cuts off one group of high-pressure heaters, wherein the group A high-pressure heaters, the group B high-pressure heaters and the group C high-pressure heaters are connected in series, the control device in the invention selects MEH, because the temperature and the pressure of steam in the group A high-pressure heaters are higher, the MEH can selectively cut off the group B high-pressure heaters or the group C high-pressure heaters according to the load, when the group B high-pressure heaters are cut off, the control device closes the second water stop valve 33 and opens the second regulating valve 32, at the moment, the feed water flowing out from the No. 5 heater 15 does not pass through the group B high-pressure heaters but directly enters the group A high-pressure heaters through the second water side bypass 31, simultaneously, the control device closes the second check valve 24 and the third, the steam quantity entering the regenerative small steam turbine 7 is increased, the load of the unit is increased, and the primary frequency modulation load function is realized.
When the C group high-pressure heater is cut off, the control device closes the third water stop valve 36 and opens the third regulating valve 34, at the moment, the feed water flowing out of the deaerator 9 does not pass through the C group high-pressure heater but directly enters the B group high-pressure heater through the third water side bypass 35, meanwhile, the control device closes the fourth check valve 26 and the fifth check valve 27, the steam extraction amount in the C group high-pressure heater can be automatically and rapidly reduced, the steam amount entering the regenerative small steam turbine 7 is increased along with the steam extraction amount, the load of the unit is increased, and the function of primary frequency modulation and load addition is realized.
When the frequency of the power grid is reduced to exceed a middle-level load value, the control device cuts off two groups of high-pressure heaters, the A group of high-pressure heaters and the B group of high-pressure heaters cannot be cut off at the same time due to high temperature and pressure of steam in the A group of high-pressure heaters, the control device can selectively cut off the A group of high-pressure heaters and the C group of high-pressure heaters or cut off the B group of high-pressure heaters and the C group of high-pressure heaters according to the load, when the B group of high-pressure heaters and the C group of high-pressure heaters are cut off, the control device closes the second water stop valve 33 and the third water stop valve 36 and opens the second regulating valve 32 and the third regulating valve 34, at the moment, feed water flowing out of the deaerator 9 does not pass through the B group of high-pressure heaters and the C group of high-pressure heaters but directly enters the A group of high-, The steam extraction amount of the third check valve 25, the fourth check valve 26 and the fifth check valve 27, the B group high-pressure heater and the C group high-pressure heater can be automatically and rapidly reduced, the steam amount entering the regenerative small steam turbine 7 is increased, the load of the unit is increased, and the function of primary frequency modulation and load addition is realized.
When the A group of high-pressure heaters and the C group of high-pressure heaters are cut off, the control device closes the first water stop valve 30 and the third water stop valve 36, and opens the first regulating valve 29 and the third regulating valve 34, at this time, the feed water flowing out of the deaerator 9 directly enters the boiler 1 through the third water side bypass 35 and the first water side bypass 28 without passing through the A group of high-pressure heaters and the C group of high-pressure heaters, meanwhile, the control device closes the first check valve 23, the fourth check valve 26 and the fifth check valve 27, the steam extraction amount in the A group of high-pressure heaters and the C group of high-pressure heaters can be automatically and rapidly reduced, the steam amount entering the regenerative small steam turbine 7 is increased, the load of the unit is increased, and the function of primary frequency modulation and load addition is realized.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A double-machine regenerative system participating in primary frequency modulation is characterized by comprising a boiler, a power generation device, a condenser, a regenerative device and a control device;
the boiler comprises a first steam outlet and a second steam outlet;
the power generation device comprises a main steam turbine generator set and a small steam turbine generator set, wherein the main steam turbine generator set comprises a main steam turbine and a main generator, one end of the main steam turbine is coaxially connected with the main generator, the small steam turbine generator set comprises a backheating type small steam turbine, a water feeding pump and a small motor, one end of the backheating type small steam turbine is coaxially connected with the water feeding pump, the other end of the backheating type small steam turbine is coaxially connected with the small motor, a steam inlet of the backheating type small steam turbine is communicated with a steam outlet of the main steam turbine, a steam extraction port is arranged on the backheating type small steam turbine, and the steam extraction port is communicated with a steam inlet of the backheating device;
the heat recovery device comprises a low-pressure heater, a deaerator and a high-pressure heater, wherein a water inlet of the low-pressure heater is communicated with a water outlet of the condenser, a water outlet of the low-pressure heater is communicated with a water inlet of the deaerator, a water inlet of the high-pressure heater is communicated with a water outlet of the deaerator, a water outlet of the high-pressure heater is communicated with a water inlet of the boiler, the high-pressure heater is arranged according to thermal parameters from high to low and sequentially numbered as an A group high-pressure heater, a B group high-pressure heater and a C group high-pressure heater, a first water side bypass is arranged on one side of the A group high-pressure heater, a first regulating valve is arranged on the first water side bypass, a second water side bypass is arranged on one side of the B group high-pressure heater, a second regulating valve is arranged on the second water side bypass, and a third, and a third regulating valve is arranged on the third water side bypass.
The control device is electrically connected with the first regulating valve, the second regulating valve and the third regulating valve.
2. The dual-machine regenerative system participating in primary frequency modulation according to claim 1, wherein the group a high-pressure heater comprises a heater No. 1 and a heater No. 2, wherein a first water stop valve is arranged on one side of the heater No. 2, and the first water stop valve is electrically connected with the control device;
the group B high-pressure heater comprises a No. 3 heater and a No. 4 heater, wherein a second water stop valve is arranged on one side of the No. 4 heater and is electrically connected with the control device;
the group C high-pressure heater comprises a No. 5 heater and a No. 6 heater, wherein a third water stop valve is arranged on one side of the No. 6 heater, and the third water stop valve is electrically connected with the control device.
3. The dual-machine regenerative system participating in primary frequency modulation according to claim 2, wherein the main turbine includes a turbine ultra-high pressure cylinder, a turbine medium pressure cylinder and a turbine low pressure cylinder;
the steam inlet of the turbine ultrahigh-pressure cylinder is communicated with the first steam outlet of the boiler, the steam outlet of the turbine ultrahigh-pressure cylinder is respectively communicated with the steam inlet of the boiler, the steam inlet of the No. 1 heater and the steam inlet of the backheating type small turbine, the steam inlet of the turbine high-pressure cylinder is communicated with the second steam outlet of the boiler, the steam outlet of the turbine high-pressure cylinder is communicated with the steam inlet of the turbine medium-pressure cylinder, the steam inlet of the turbine low-pressure cylinder is communicated with the steam outlet of the turbine medium-pressure cylinder, and the steam outlet of the turbine low-pressure cylinder is communicated with the steam inlet of the condenser.
4. The dual-machine regenerative system participating in primary frequency modulation according to claim 2, wherein the steam extraction ports comprise a No. 1 steam extraction port, a No. 2 steam extraction port, a No. 3 steam extraction port, a No. 4 steam extraction port, a No. 5 steam extraction port, and a No. 6 steam extraction port;
the steam extraction port No. 1 is communicated with the steam inlet of the heater No. 2, a first check valve is arranged between the steam extraction port No. 1 and the heater No. 2, and the first check valve is electrically connected with the control device;
the steam extraction port No. 2 is communicated with the steam inlet of the heater No. 3, a second check valve is arranged between the steam extraction port No. 2 and the heater No. 3, and the second check valve is electrically connected with the control device;
the No. 3 steam extraction port is communicated with the steam inlet of the No. 4 heater, a third check valve is arranged between the No. 3 steam extraction port and the No. 4 heater, and the third check valve is electrically connected with the control device;
the No. 4 steam extraction port is communicated with the steam inlet of the No. 5 heater, a fourth check valve is arranged between the No. 4 steam extraction port and the No. 5 heater, and the fourth check valve is electrically connected with the control device;
the No. 5 steam extraction port is communicated with the steam inlet of the No. 6 heater, a fifth check valve is arranged between the No. 5 steam extraction port and the No. 6 heater, and the fifth check valve is electrically connected with the control device;
the No. 6 steam extraction port is communicated with a steam inlet of the deaerator.
5. The dual-turbine regenerative system participating in primary frequency modulation according to claim 1, wherein the exhaust port of the small regenerative turbine is respectively communicated with the steam inlet of the low-pressure heater and the steam inlet of the condenser.
6. An operation method of a double-machine regenerative system participating in primary frequency modulation is characterized by comprising the following steps:
step 1, setting a primary load value and a secondary load value at a control device;
step 2, when the power grid frequency drops and exceeds a primary load numerical value, the control device triggers and cuts off an instruction of one group of high-pressure heaters, the steam extraction amount of the high-pressure heaters is reduced, the load is increased, and the function of increasing the load by primary frequency modulation is realized;
and 3, after the grid frequency is recovered, the control device enables the high-voltage heater to recover to an initial running state.
7. The operating method of the dual thermal system participating in primary frequency modulation according to claim 6, wherein the primary load value in step 1 is 75%, and the medium load value is 40%.
8. The operating method of the dual thermal regenerative system participating in primary frequency modulation according to claim 6, wherein the instruction for cutting off one group of high-pressure heaters in step 2 is to cut off the group B high-pressure heaters or the group C high-pressure heaters;
when the B group of high-pressure heaters are cut off, the control device closes the second water stop valve and opens the second regulating valve, and meanwhile, the control device closes the second check valve and the third check valve;
when the C group high-pressure heater is cut off, the control device closes the third water stop valve and opens the third regulating valve, and meanwhile, the control device closes the third check valve and the fourth check valve.
9. The operating method of the dual-machine regenerative system participating in primary frequency modulation according to claim 6, wherein the instruction for cutting off the two groups of high-pressure heaters in step 2 is to cut off the group A high-pressure heaters and the group C high-pressure heaters or cut off the group B high-pressure heaters and the group C high-pressure heaters;
when the A group of high-pressure heaters and the C group of high-pressure heaters are cut off, the control device closes the first water stop valve and the third water stop valve, opens the first regulating valve and the third regulating valve, and closes the first check valve, the fourth check valve and the fifth check valve;
when the B group of high-pressure heaters and the C group of high-pressure heaters are cut off, the control device closes the second water stop valve and the third water stop valve, opens the second regulating valve and the third regulating valve, and closes the second check valve, the third check valve, the fourth check valve and the fifth check valve.
10. The operating method of the dual-machine regenerative system participating in primary frequency modulation according to claim 6, wherein the high-pressure heater in step 3 is restored to the initial operating state, that is, the group A high-pressure heater, the group B high-pressure heater and the group C high-pressure heater are all put into operation.
CN201911055642.0A 2019-10-31 2019-10-31 Double-machine regenerative system participating in primary frequency modulation and operation method thereof Pending CN110645062A (en)

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Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102720550A (en) * 2012-07-02 2012-10-10 上海汽轮机厂有限公司 Dual-machine regenerative steam extraction steam thermodynamic system
WO2013000720A2 (en) * 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Additional controlled extraction for a preheater for improving the plant dynamics and the frequency regulation in a steam power plant
CN105863754A (en) * 2016-04-19 2016-08-17 东南大学 700 DEG C ultra-supercritical secondary reheating thermodynamic system
CN106150575A (en) * 2016-08-12 2016-11-23 浙江浙能技术研究院有限公司 A kind of tackle the anxious steam turbine fallen of mains frequency and meet an urgent need application of load device and method
CN106352321A (en) * 2016-09-14 2017-01-25 上海明华电力技术工程有限公司 Method for removing high-pressure heater based on waterside bypass to participate in primary frequency modulation of unit
CN106402840A (en) * 2016-09-14 2017-02-15 上海明华电力技术工程有限公司 Method for cutting out high-pressure heater steam side valve for participating in unit primary frequency modulation and load adding
CN206539375U (en) * 2017-01-06 2017-10-03 山东电力工程咨询院有限公司 A kind of coaxial double drive feed-water pumps of power-balance generating steam turbine
CN108049922A (en) * 2018-01-08 2018-05-18 华北电力大学 A kind of width operating mode double reheat two-shipper heat regenerative system
CN108397242A (en) * 2017-02-08 2018-08-14 中国电力工程顾问集团华东电力设计院有限公司 Based on asynchronous machine full power convertor speed governing small turbine control system and method
CN108412564A (en) * 2018-05-02 2018-08-17 华北电力大学 A kind of double reheat system and method for efficient backheat and optimization steam extraction
CN208057170U (en) * 2018-03-12 2018-11-06 中国能源建设集团广东省电力设计研究院有限公司 Two-shipper backheat generating set and its backheat electricity generation system
CN109653818A (en) * 2018-11-30 2019-04-19 东方电气集团东方汽轮机有限公司 A kind of two-stage back pressure machine reheating extraction for heat supply System and method for
CN210948817U (en) * 2019-10-31 2020-07-07 大唐郓城发电有限公司 Double-machine regenerative system participating in primary frequency modulation

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013000720A2 (en) * 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Additional controlled extraction for a preheater for improving the plant dynamics and the frequency regulation in a steam power plant
CN102720550A (en) * 2012-07-02 2012-10-10 上海汽轮机厂有限公司 Dual-machine regenerative steam extraction steam thermodynamic system
CN105863754A (en) * 2016-04-19 2016-08-17 东南大学 700 DEG C ultra-supercritical secondary reheating thermodynamic system
CN106150575A (en) * 2016-08-12 2016-11-23 浙江浙能技术研究院有限公司 A kind of tackle the anxious steam turbine fallen of mains frequency and meet an urgent need application of load device and method
CN106352321A (en) * 2016-09-14 2017-01-25 上海明华电力技术工程有限公司 Method for removing high-pressure heater based on waterside bypass to participate in primary frequency modulation of unit
CN106402840A (en) * 2016-09-14 2017-02-15 上海明华电力技术工程有限公司 Method for cutting out high-pressure heater steam side valve for participating in unit primary frequency modulation and load adding
CN206539375U (en) * 2017-01-06 2017-10-03 山东电力工程咨询院有限公司 A kind of coaxial double drive feed-water pumps of power-balance generating steam turbine
CN108397242A (en) * 2017-02-08 2018-08-14 中国电力工程顾问集团华东电力设计院有限公司 Based on asynchronous machine full power convertor speed governing small turbine control system and method
CN108049922A (en) * 2018-01-08 2018-05-18 华北电力大学 A kind of width operating mode double reheat two-shipper heat regenerative system
CN208057170U (en) * 2018-03-12 2018-11-06 中国能源建设集团广东省电力设计研究院有限公司 Two-shipper backheat generating set and its backheat electricity generation system
CN108412564A (en) * 2018-05-02 2018-08-17 华北电力大学 A kind of double reheat system and method for efficient backheat and optimization steam extraction
CN109653818A (en) * 2018-11-30 2019-04-19 东方电气集团东方汽轮机有限公司 A kind of two-stage back pressure machine reheating extraction for heat supply System and method for
CN210948817U (en) * 2019-10-31 2020-07-07 大唐郓城发电有限公司 Double-machine regenerative system participating in primary frequency modulation

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