CN113175367B - Master control system for improving peak regulation capacity and flexibility of unit and operation method - Google Patents
Master control system for improving peak regulation capacity and flexibility of unit and operation method Download PDFInfo
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- CN113175367B CN113175367B CN202110449590.6A CN202110449590A CN113175367B CN 113175367 B CN113175367 B CN 113175367B CN 202110449590 A CN202110449590 A CN 202110449590A CN 113175367 B CN113175367 B CN 113175367B
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D13/00—Combinations of two or more machines or engines
- F01D13/02—Working-fluid interconnection of machines or engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- Thermal Sciences (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a main control system for improving the peak regulation capacity and flexibility of a turbine set and an operation method thereof. The additional system connects the main steam, the reheating cold section steam, the reheating hot section steam, the intermediate pressure cylinder exhaust steam, the low pressure cylinder exhaust steam and the final water supply to the corresponding main pipes respectively. When partial unit boilers are shut down, hot standby or two-shift operation, main and reheat steam can be obtained by a steam turbine of the blowing out unit through controlling the connection valve group between each main pipe and the unit, cold reheat steam of the blowing out unit is recycled, blowing out is not stopped, in addition, regenerative steam extraction of the blowing out unit comes from an adjacent unit, steam exhaust of a middle pressure cylinder is reversely sent to low pressure cylinders of other units, and the average low pressure cylinder operation efficiency of multiple units is improved. By adopting the method, the unit can realize further machine-furnace decoupling under the operating condition of 'less furnaces and multiple machines', and further reduce the output power rate of the steam turbine generator unit under the operating condition of deep peak shaving under the normal operating condition of the boiler in operation.
Description
Technical Field
The invention belongs to the field of thermal power generation, and particularly relates to a main pipe system and an operation method for improving peak shaving capacity and flexibility of a unit.
Background
In recent years, under the vigorous guidance of national policies, renewable energy in China is rapidly developed. The installed capacity of wind power and photovoltaic power generation in the third quarter of 2020 exceeds 2.23 hundred million kilowatts, and the proportion of the wind power and solar energy accumulated power generation to the total power generation is 10.0% when the three quarter accumulated power generation in the first quarter of 2020 exceeds 5322 hundred million kilowatts.
Due to the fact that randomness and intermittence of wind power generation and photovoltaic power generation are strong, negative effects are brought to safe and stable operation of a power grid due to large-scale grid connection of the wind power generation and the photovoltaic power generation. In order to improve the consumption capability of renewable energy, thermal power generating units bearing more than 70% of the electricity generated in China need to bear the peak regulation task of a power grid, and the deep peak regulation work tends to be normalized. With the further improvement of the requirement of the power grid on the peak regulation capacity of the traditional thermal power generating unit, the peak regulation amplitude of the unit needs to break through the traditional load interval urgently.
The conventional flexible modification technologies of thermal power generating units, namely boiler low-load stable combustion and unit thermoelectric decoupling, have limitations. For the low-load stable combustion of the boiler, the space for further reducing the load of the unit is limited by factors such as poor filling degree of flame in the boiler, difficult stable combustion of pulverized coal in the boiler and the like during the low-load operation of the boiler; the application of the thermoelectric decoupling technology requires larger heat load users around the power station, and limits the practical application of deep peak regulation.
Therefore, the deep peak regulation technology suitable for all operation modes of the thermal power generating unit is provided, and the deep peak regulation technology has important significance for new energy transformation of a power generation system.
Disclosure of Invention
The invention aims to provide a main control system and an operation method for improving the peak shaving capacity and flexibility of a unit, so that the flexibility of the unit under the deep peak shaving operation condition and the unit power generation capacity under the accident state of boiler equipment are improved.
The invention is realized by adopting the following technical scheme:
a kind of header system which promotes the peak regulation ability and flexibility of the unit, including steam-water system and add the system of the turboset; wherein, add the system and include: the system comprises a main steam communication main pipe, a reheat cold section steam communication main pipe, a reheat hot section steam communication main pipe, a high-pressure cylinder steam extraction communication main pipe, a deaerator steam extraction communication main pipe, a three-section steam extraction communication main pipe, a final water supply communication main pipe and an intermediate pressure cylinder steam exhaust communication main pipe;
the main steam communication main pipe is respectively connected to a superheater outlet main steam pipeline of each unit boiler, a connection point is arranged on a pipeline between a boiler superheater outlet valve group and a steam turbine steam inlet valve group, and a single machine to main steam communication main pipe control and isolation valve group is arranged between the connection point and the main steam communication main pipe;
the reheat cooling section steam communication main pipe is connected with a reheat cooling section steam pipeline of each unit boiler, a connection point is arranged on a pipeline between a high-pressure cylinder outlet of a steam turbine and a boiler reheater steam inlet valve bank, and a single-machine to reheat cooling section steam communication main pipe control and isolation valve bank is arranged between the connection point and the reheat cooling section steam communication main pipe;
the reheating heat section steam communication main pipe is connected with reheating heat section steam pipelines of the boiler of each unit, the connection point is arranged on a pipeline between a boiler reheater steam outlet valve bank and the inlet of a steam turbine intermediate pressure cylinder, and a single machine to reheating heat section steam communication main pipe control and isolation valve bank is arranged between the connection point and the reheating heat section steam communication main pipe;
the high-pressure cylinder steam extraction communication main pipe is connected with pipelines of high-pressure cylinder steam extraction to high-pressure heater systems of the turbines of all the units, a connection point is arranged on the pipeline between the high-pressure cylinder steam extraction valve group of the turbine and the steam inlet valve group of the high-pressure heater systems, and a single-machine high-pressure cylinder steam extraction communication main pipe control and isolation valve group is arranged between the connection point and the high-pressure cylinder steam extraction communication main pipe;
the deaerator steam extraction communication main pipe is connected with a pipeline from a steam extraction of a steam turbine deaerator to the deaerator, a connection point is arranged on the pipeline between a steam extraction valve group of the steam turbine deaerator and a steam inlet valve group of the deaerator, and a single machine is arranged between the connection point and the deaerator steam extraction communication main pipe and is connected with a steam extraction communication main pipe control and isolation valve group of the deaerator;
the three-section steam extraction communication main pipe is connected with a pipeline from three-section steam extraction of each unit to a third-stage high-pressure heater, a connection point is arranged on the pipeline between the three-section steam extraction valve group and a steam inlet valve group of a third-stage high-pressure heater system, and a single-unit to three-section steam extraction communication main pipe isolation and control valve group is arranged between the connection point and the three-section steam extraction communication main pipe;
the final water supply communication main pipe is connected with boiler water supply pipelines of the outlets of the high-pressure heater systems of the units, a connection point is arranged on the boiler water supply pipeline of the control valve group for isolating the outlet of the high-pressure heater system from the inlet of the boiler water supply economizer, and a single machine to the control valve group of the final water supply communication main pipe are arranged between the connection point and the final water supply communication main pipe;
the steam exhaust and communication main pipe of the intermediate pressure cylinder is connected with a steam inlet pipeline from the steam exhaust of the intermediate pressure cylinder to the low pressure cylinder of the steam turbine, the connection point is arranged on a pipeline between the outlet of the intermediate pressure cylinder of the steam turbine and the inlet valve group of the low pressure cylinder of the steam turbine, and a single machine and a steam exhaust and communication main pipe control and isolation valve group from the intermediate pressure cylinder are arranged between the connection point and the steam exhaust and communication main pipe of the intermediate pressure cylinder.
A further improvement of the present invention is that the add-on system further comprises: the low-pressure cylinder extraction and communication main pipe is connected with a steam extraction pipeline of the low-pressure cylinder of the steam turbine, the connection point is arranged on the pipeline between the steam extraction valve set of the low-pressure cylinder of the steam turbine and the steam inlet valve set of the low-pressure heater system, and a single-machine to low-pressure cylinder extraction and communication main pipe control and isolation valve set is arranged between the connection point and the low-pressure cylinder extraction and communication main pipe.
The invention is further improved in that the steam-water system of the steam turbine set comprises boilers 1, 2, … … and n, wherein the outlet of a superheated steam pipeline of each boiler is communicated with the steam inlet of a high-pressure cylinder, the steam outlet of a high-pressure cylinder is communicated with the inlet of a reheated steam pipeline of the boiler, the outlet of the reheated steam pipeline of the boiler is communicated with the steam inlet of an intermediate-pressure cylinder, the steam outlet of the intermediate-pressure cylinder is communicated with the steam inlet of a low-pressure cylinder, the steam outlet of the low-pressure cylinder is communicated with a condenser, the steam outlet of the high-pressure cylinder is communicated with the steam inlet of a high-pressure heating system, the steam outlet of the intermediate-pressure cylinder is communicated with the steam inlet of a deaerator, the steam outlet of the low-pressure cylinder is communicated with the steam inlet of a low-pressure heating system, and the condenser, the condensate pump, the low-pressure heating system, the deaerator and the water feeding pump are sequentially communicated with the water inlet and the water outlet of the high-pressure heating system, and the water outlet of the high-pressure heating system is communicated with the inlet of a water feeding pipeline of the boiler.
The invention is further improved in that when only two units are provided, the two units are connected by using a communicating pipe equipped with an isolation valve group and a control valve group.
An operation method of a main control system for improving the peak regulation capacity and flexibility of a unit is based on the main control system for improving the peak regulation capacity and flexibility of the unit, taking the shutdown of a boiler of a No. 1 unit in a plurality of units as an example, and comprises the following steps:
when the No. 1 boiler is stopped, closing a main steam isolation valve group, a reheating cold section steam isolation valve group and a hot section steam isolation valve group of the No. 1 boiler to prevent steam from flowing back to the stopped boiler; opening a main steam communication main pipe control and isolation valve group of the boiler, and supplying main steam to the No. 1 steam turbine and the steam turbine of the unit by the boilers of other units at the same time; opening a control and isolation valve group of a reheating cold section steam communication main pipe, enabling the cold reheating steam of the No. 1 unit to enter the reheating cold section steam communication main pipe, and heating the reheating cold section steam of the No. 1 unit by boilers of other units; opening a reheating hot section steam communication main pipe control and isolation valve group, and supplying reheating hot section steam to the No. 1 steam turbine and a middle pressure cylinder of the unit by boilers of other units; closing a steam extraction isolation and control valve of the No. 1 high-pressure cylinder, opening a steam extraction communication main pipe control and isolation valve group of the No. 1 high-pressure cylinder, wherein the No. 1 high-pressure cylinder does not extract steam, and adjacent units supply steam for the No. 1 high-pressure heater system; closing three-section steam extraction isolation and control valves of the No. 1 machine, opening a control and isolation valve group of a three-section steam extraction communication main pipe of the No. 1 machine, wherein the No. 1 machine does not perform three-section steam extraction, and an adjacent machine set supplies steam for a third-stage high-pressure heater of the No. 1 machine; closing a steam extraction isolation and control valve of the deaerator of the machine No. 1, opening a steam extraction communication mother pipe control and isolation valve group of the deaerator of the machine No. 1, wherein the deaerator steam extraction of the machine No. 1 is not carried out, and the steam inlet and steam supply of the deaerator of the machine No. 1 are carried out on adjacent units; opening a steam exhaust communication main pipe control and isolation valve group of the No. 1 intermediate pressure cylinder, adjusting a steam inlet control and isolation valve group of the No. 1 low pressure cylinder, enabling the steam exhaust of the No. 1 intermediate pressure cylinder of the steam turbine to enter low pressure cylinders of other units for acting, enabling the No. 1 low pressure cylinder of the steam turbine to be in the lowest steam inlet flow state, enabling the steam inlet flow to meet the lowest cooling steam requirement of the low pressure cylinder, and operating the unit which is transformed into the low pressure cylinder with zero output of the low pressure cylinder in the mode of zero output of the low pressure cylinder; closing the steam extraction isolation and control valve of the No. 1 machine low-pressure cylinder, opening the steam extraction communication main pipe control and isolation valve of the No. 1 machine low-pressure cylinder, not extracting steam, and supplying steam to the No. 1 machine low-pressure heater system by the adjacent machine set; closing an inlet control and isolation valve group of a boiler water supply economizer of the No. 1 boiler to prevent feed water from flowing backwards to a boiler shutdown unit, opening a final feed water communication main pipe control and isolation valve group of the No. 1 boiler, conveying the heated feed water to other unit boilers, and continuing the next steam-water circulation.
A further improvement of the invention is that boiler outages refer to maintenance, failure, unit two shift operation, unit hot standby, and all other situations where there is a planned or unexpected outage of the boiler plant.
The invention further improves the technical scheme that the valve group refers to a regulating valve and an isolating valve.
A further development of the invention is that the valves are of the kind electrically, pneumatically, hydraulically and manually operated.
Compared with the prior art, the invention has at least the following beneficial technical effects:
1. by using the invention, when part of the unit boilers are shut down, are in hot standby or are in two-shift operation, the steam turbines of the shutdown unit can obtain main and reheat steam by controlling the main pipes and the inter-unit connecting valve group, and the cold and reheat steam of the shutdown unit is recovered, so that shutdown is not stopped.
2. By adopting the method, the regenerative steam extraction of the blowing-out unit comes from the adjacent unit, and the steam exhausted by the intermediate pressure cylinder is reversely sent to the low pressure cylinder of other units, so that the operation efficiency of the average low pressure cylinder of a plurality of units is improved.
3. Because the efficiency of the low-pressure cylinder is closely related to the volume flow of the exhausted steam, the efficiency of the low-pressure cylinder of the steam turbine is obviously reduced along with the reduction of the load under the operating conditions of low load and deep peak shaving. When one furnace and two machines operate, the steam inlet flow of a single low-pressure cylinder is small, the efficiency of the low-pressure cylinder is obviously reduced, and the economy of the machine set under deep peak shaving is greatly influenced. By using the invention, under the operating condition of deep peak regulation, the steam turbine of the whole blowing out unit can not extract steam, the extracted steam of the regenerative system completely comes from the steam turbines of other units, the low pressure cylinder of the blowing out unit is in the lowest steam inlet flow state or the zero output state, the steam inlet quantity is completely sent back to the low pressure cylinders of other units, and the actual operating efficiency of the average low pressure cylinder of a plurality of units is improved.
4. By adopting the method, the unit can realize further machine-furnace decoupling under the operating condition of 'less furnaces and multiple machines', and further reduce the output power rate of the steam turbine generator unit under the operating condition of deep peak shaving under the normal operating condition of the boiler in operation.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Reference numbers (Pn refers to pump of nth unit, Vn refers to valve of nth unit):
pn-1, a water supply pump,
pn-2, a condensate pump,
vn-1, a main steam communication main pipe control and isolation valve bank,
vn-2, a boiler main steam control and isolation valve bank,
vn-3, a reheating cold section steam is communicated with a main pipe control and isolation valve bank,
vn-4, a reheating cold section steam control and an isolation valve bank,
vn-5, a reheating thermal section steam is communicated with a main pipe control and isolation valve bank,
vn-6, a reheating hot section steam control and an isolation valve bank,
vn-7, a high-pressure cylinder steam inlet control and an isolation valve bank,
vn-8, a middle pressure cylinder steam inlet control and an isolation valve group,
vn-9, a low-pressure cylinder steam inlet control and an isolation valve bank,
vn-10, a high-pressure cylinder steam extraction control and isolation valve bank,
vn-11, a deaerator steam extraction control and an isolation valve bank,
vn-12, three-stage steam extraction control and isolation valve bank,
vn-13, a high pressure heater system steam inlet control and an isolation valve set,
vn-14, a deaerator steam inlet control and an isolation valve bank,
vn-15, third-stage heater steam inlet control and isolation valve group,
vn-16, an inlet control and isolation valve bank of a boiler water supply economizer,
vn-17, a final water supply communication main pipe control and isolation valve group,
vn-18, a high-pressure cylinder steam extraction communication main pipe control and isolation valve group,
vn-19, a deaerator steam extraction and communication main pipe control and isolation valve bank,
vn-20, three-section steam extraction and communication main pipe control and isolation valve bank,
vn-21, the intermediate pressure cylinder exhaust steam communication main pipe isolation and control valve group,
vn-22, a low-pressure cylinder steam extraction control and isolation valve bank,
vn-23, a low-pressure cylinder steam extraction communication main pipe control and isolation valve group,
vn-24, low pressure heater system admission control, isolation valves.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the header system for improving the peak shaving capacity and flexibility of the unit provided by the invention comprises a conventional boiler, a steam-water system of a steam turbine unit and an additional system. Wherein, add the system and include: the system comprises a main steam communication main pipe, a reheating cold section steam communication main pipe, a reheating hot section steam communication main pipe, a high-pressure cylinder steam extraction communication main pipe, a deaerator steam extraction communication main pipe, a three-section steam extraction communication main pipe, a final water supply communication main pipe, an intermediate pressure cylinder steam extraction communication main pipe, a low-pressure cylinder steam extraction communication main pipe and a corresponding control and shutoff valve group.
Wherein, the steam-water system of the steam turbine set comprises boilers 1, 2, … … and n, the outlet of the superheated steam pipeline of each boiler is communicated with the steam inlet of the high-pressure cylinder, the steam outlet of the high-pressure cylinder is communicated with the inlet of the reheated steam pipeline of the boiler, the outlet of the reheated steam pipeline of the boiler is communicated with the steam inlet of the intermediate pressure cylinder, the steam outlet of the intermediate pressure cylinder is communicated with the steam inlet of the low-pressure cylinder, the steam outlet of the low-pressure cylinder is communicated with the condenser, the steam outlet of the high-pressure cylinder is communicated with the steam inlet of the high-pressure heating system, the steam outlet of the intermediate pressure cylinder is communicated with the steam inlet of the deaerator, the steam outlet of the low-pressure cylinder is communicated with the steam inlet of the low-pressure heating system, and the condenser, the condensate pump, the low-pressure heating system, the deaerator and the water feeding pump are sequentially communicated with the water inlet and the water outlet of the high-pressure heating system, and the water outlet of the high-pressure heating system is communicated with the inlet of a water feeding pipeline of the boiler.
The connection mode of the main steam communication main pipe in the additionally-arranged system is as follows: the main steam communication main pipe is respectively connected to a superheater outlet main steam pipeline of each unit boiler, a connection point is arranged on a pipeline between a boiler superheater outlet valve bank Vn-2 and a steam turbine high-pressure cylinder steam inlet valve bank Vn-7, and a single machine to main steam communication main pipe control and isolation valve bank Vn-1 is arranged between the connection point and the main steam communication main pipe.
The connection mode of the reheating cold section steam communication main pipe in the additionally-arranged system is as follows: the reheating cold section steam communication main pipe is connected with a reheating cold section steam pipeline of each unit boiler, the connection point is arranged on a pipeline between the outlet of a steam turbine high-pressure cylinder and a boiler reheater steam inlet valve bank Vn-4, and a single machine to reheating cold section steam communication main pipe control and isolation valve bank Vn-3 is arranged between the connection point and the reheating cold section steam communication main pipe.
The reheating thermal section steam communication main pipe in the additionally-arranged system is connected in a mode that: the reheating thermal section steam communication main pipe is connected with reheating thermal section steam pipelines of the boilers of the units, the connection point is arranged on a pipeline between a boiler reheater steam outlet valve bank Vn-6 and a steam inlet valve bank Vn-8 of a steam turbine intermediate pressure cylinder, and a single machine to reheating thermal section steam communication main pipe control and isolation valve bank Vn-5 is arranged between the connection point and the reheating thermal section steam communication main pipe.
The connecting mode of the high-pressure cylinder steam extraction communication main pipe in the additionally-arranged system is as follows: the high-pressure cylinder steam extraction communication main pipe is connected with pipelines of high-pressure cylinder steam extraction to high-pressure heater systems of the turbines of the units, a connection point is arranged on the pipeline between the steam extraction valve bank Vn-10 of the high-pressure cylinder steam extraction valve bank of the turbine and the steam inlet valve bank Vn-13 of the high-pressure heater systems, and a single-machine high-pressure cylinder steam extraction communication main pipe control and isolation valve bank Vn-18 is arranged between the connection point and the high-pressure cylinder steam extraction communication main pipe.
The connecting mode of the deaerator steam extraction communication main pipe in the additionally-arranged system is as follows: the deaerator steam extraction communication mother pipe is connected with a pipeline from a steam turbine deaerator steam extraction to a deaerator, a connection point is arranged on the pipeline between a steam turbine deaerator steam extraction valve bank Vn-11 and a deaerator steam inlet valve bank Vn-14, and a single machine is arranged between the connection point and the deaerator steam extraction communication mother pipe, and a control valve bank Vn-19 and an isolation valve bank are arranged between the connection point and the deaerator steam extraction communication mother pipe.
The connection mode of the three-section steam extraction communication main pipe in the additionally-arranged system is as follows: the three-section steam extraction communication main pipe is connected with a pipeline from the three-section steam extraction of each unit to the third-stage high-pressure heater, a connection point is arranged on the pipeline between the three-section steam extraction valve bank Vn-12 and the steam inlet valve bank Vn-15 of the third-stage high-pressure heater system, and a single machine to the isolation and control valve bank Vn-20 of the three-section steam extraction communication main pipe is arranged between the connection point and the three-section steam extraction communication main pipe.
The final water supply communication main pipe in the additionally-arranged system is connected in a mode that: the final water supply communication main pipe is connected with boiler water supply pipelines at the outlets of the high-pressure heater systems of the units, the connection point is arranged on the boiler water supply pipeline of the control valve bank Vn-16 for isolating the outlet of the high-pressure heater system from the inlet of the boiler water supply economizer, and a single machine is arranged between the connection point and the final water supply communication main pipe to the control valve bank Vn-17 of the final water supply communication main pipe.
The connection mode of the steam exhaust and communication main pipe of the medium pressure cylinder in the additionally-arranged system is as follows: the intermediate pressure cylinder steam exhaust communication main pipe is connected with a steam exhaust pipeline from an intermediate pressure cylinder to a low pressure cylinder of the steam turbine, a connection point is arranged on a pipeline between a steam exhaust port of the intermediate pressure cylinder of the steam turbine and a steam inlet valve group Vn-9 of the low pressure cylinder of the steam turbine, and a single-machine to intermediate pressure cylinder steam exhaust communication main pipe control and isolation valve group Vn-21 is arranged between the connection point and the intermediate pressure cylinder steam exhaust communication main pipe.
The connecting mode of the steam extraction and communication main pipe of the low-pressure cylinder in the additionally-arranged system is as follows: the low-pressure cylinder steam extraction communication main pipe is connected with a steam extraction pipeline of a low-pressure cylinder of a steam turbine, the connection point is arranged on a pipeline between a steam extraction valve bank Vn-22 of the low-pressure cylinder of the steam turbine and a steam inlet valve bank Vn-24 of a low-pressure heater system, and a single-machine to low-pressure cylinder steam extraction communication main pipe control and isolation valve bank Vn-23 is arranged between the connection point and the low-pressure cylinder steam extraction communication main pipe.
The invention provides an operation method of a main control system for improving peak regulation capacity and flexibility of a unit, which takes the shutdown of a boiler of a unit No. 1 in a plurality of units as an example and comprises the following operation contents:
when the No. 1 boiler is stopped, the main steam isolation valve group V1-2, the cold reheat section steam isolation valve group V1-4 and the hot reheat section steam isolation valve group V1-6 of the No. 1 boiler are closed, and steam is prevented from flowing back to the stopped boiler. Opening a main steam communication main pipe control and isolation valve group V1-1 of a boiler of the No. 1 unit, and opening main steam communication main pipe control and isolation valve groups Vm-1(m is 2,3,4, …, n is the number of other running units and can be a plurality of units) of boilers of other running units, wherein the boilers of other units can simultaneously supply main steam for a steam turbine of the No. 1 unit and a steam turbine of the local unit; opening a reheating cold section steam communication main pipe control and isolation valve group V1-3, enabling cold reheating steam of the No. 1 machine set to enter the reheating cold section steam communication main pipe, opening other operation machine set reheating cold section steam communication main pipe control and isolation valve group Vm-3, and heating the reheating cold section steam of the No. 1 machine set by boilers of other machine sets; opening a reheating hot section steam communication main pipe control and isolation valve group V1-5, opening other operation unit reheating hot section steam communication main pipe control and isolation valve group Vm-5, and supplying reheating hot section steam to a No. 1 steam turbine and a middle pressure cylinder of the unit by boilers of other units; closing a steam extraction isolation and control valve V1-10 of the No. 1 high-pressure cylinder, opening a steam extraction communication main pipe control and isolation valve group V1-18 of the No. 1 high-pressure cylinder, wherein the No. 1 high-pressure cylinder does not extract steam, and adjacent units supply steam for the No. 1 high-pressure heater system; closing a three-section steam extraction isolation and control valve V1-12 of the No. 1 machine, opening a three-section steam extraction communication main pipe control and isolation valve group V1-20 of the No. 1 machine, wherein the No. 1 machine does not perform three-section steam extraction, and adjacent machine sets supply steam for a third-stage high-pressure heater of the No. 1 machine; closing a steam extraction isolation and control valve V1-11 of the No. 1 machine deaerator, opening a steam extraction communication main pipe control and isolation valve group V1-19 of the No. 1 machine deaerator, not performing deaerator steam extraction on the No. 1 machine, and feeding steam to the No. 1 machine deaerator by an adjacent machine set; opening a steam exhaust communication main pipe control and isolation valve group V1-21 of the No. 1 intermediate pressure cylinder, adjusting a steam inlet control and isolation valve group V1-9 of the No. 1 intermediate pressure cylinder, enabling the steam exhaust of the No. 1 intermediate pressure cylinder to enter the low pressure cylinders of other sets of turbines for acting, enabling the No. 1 low pressure cylinder of the turbine to be in the state of lowest steam inlet flow, enabling the steam inlet flow to meet the requirement of lowest cooling steam of the low pressure cylinder, and operating in a mode of zero output of the low pressure cylinder for a set which is transformed into zero output of the low pressure cylinder; closing the steam extraction isolation and control valve V1-22 of the No. 1 machine low-pressure cylinder, opening the steam extraction communication main pipe control and isolation valve V1-23 of the No. 1 machine low-pressure cylinder, not performing steam extraction, and supplying steam to the No. 1 machine low-pressure heater system by an adjacent machine set; closing an inlet control and isolation valve group V1-16 of a boiler water supply economizer of the No. 1 boiler, preventing feed water from flowing backwards to a boiler shutdown unit, opening a final feed water communication main pipe control and isolation valve group V1-17 of the No. 1 boiler, conveying the heated feed water to other unit boilers, and continuing the next steam-water circulation.
Table 1 shows the comparison between the operation states of the main valves and the equipment of the system under the conventional unit system operation condition and the operation states of the main valves and the equipment of the system under the less-furnace multi-machine operation condition by using the method of the present invention.
Table 1 takes two units as an example, the unit system operation is that the two units both operate normally, the less-furnace multi-machine system operation is that the No. 1 unit boiler stops operating, and the No. 2 unit boiler supplies main steam to the No. 1 unit turbine and the No. 2 unit turbine at the same time.
By adopting the method, the unit can realize further machine-furnace decoupling under the operation condition of less-furnace multi-machine, and the output power rate of the steam turbine generator unit under the operation condition of deep peak regulation is further reduced under the normal operation condition of the operating boiler. By using the invention, under the operating condition of deep peak regulation, the steam turbine of the whole blowing out unit can not extract steam, the extracted steam of the regenerative system completely comes from the steam turbines of other units, the low pressure cylinder of the blowing out unit is in the lowest steam inlet flow state or the zero output state, the steam inlet quantity is completely sent back to the low pressure cylinders of other units, and the actual operating efficiency of the average low pressure cylinder of a plurality of units is improved.
Claims (1)
1. An operation method of a main control system for improving the peak regulation capacity and flexibility of a unit is characterized in that the method is based on the main control system for improving the peak regulation capacity and flexibility of the unit, and the system comprises a steam-water system of a steam turbine unit and an additional system; wherein, add the system and include: the system comprises a main steam communication main pipe, a reheat cold section steam communication main pipe, a reheat hot section steam communication main pipe, a high-pressure cylinder steam extraction communication main pipe, a deaerator steam extraction communication main pipe, a three-section steam extraction communication main pipe, a final water supply communication main pipe and an intermediate pressure cylinder steam exhaust communication main pipe; the main steam communication main pipe is respectively connected to a superheater outlet main steam pipeline of each unit boiler, a connection point is arranged on a pipeline between a boiler superheater outlet valve group and a steam turbine steam inlet valve group, and a single machine to main steam communication main pipe control and isolation valve group is arranged between the connection point and the main steam communication main pipe; the reheat cooling section steam communication main pipe is connected with a reheat cooling section steam pipeline of each unit boiler, a connection point is arranged on a pipeline between a high-pressure cylinder outlet of a steam turbine and a boiler reheater steam inlet valve bank, and a single-machine to reheat cooling section steam communication main pipe control and isolation valve bank is arranged between the connection point and the reheat cooling section steam communication main pipe; the reheating heat section steam communication main pipe is connected with reheating heat section steam pipelines of the boiler of each unit, the connection point is arranged on a pipeline between a boiler reheater steam outlet valve bank and the inlet of a steam turbine intermediate pressure cylinder, and a single machine to reheating heat section steam communication main pipe control and isolation valve bank is arranged between the connection point and the reheating heat section steam communication main pipe; the high-pressure cylinder steam extraction communication main pipe is connected with pipelines of high-pressure cylinder steam extraction to high-pressure heater systems of the turbines of all the units, a connection point is arranged on the pipeline between the high-pressure cylinder steam extraction valve group of the turbine and the steam inlet valve group of the high-pressure heater systems, and a single-machine high-pressure cylinder steam extraction communication main pipe control and isolation valve group is arranged between the connection point and the high-pressure cylinder steam extraction communication main pipe; the deaerator steam extraction communication main pipe is connected with a pipeline from a steam turbine deaerator steam extraction to a deaerator, a connection point is arranged on the pipeline between a steam turbine deaerator steam extraction valve group and a deaerator steam inlet valve group, and a single machine to a deaerator steam extraction communication main pipe control and isolation valve group is arranged between the connection point and the deaerator steam extraction communication main pipe; the three-section steam extraction communication main pipe is connected with a pipeline from three-section steam extraction to a third-stage high-pressure heater of each unit, a connection point is arranged on the pipeline between the three-section steam extraction valve group and a steam inlet valve group of a third-stage high-pressure heater system, and a single-unit to three-section steam extraction communication main pipe isolation and control valve group is arranged between the connection point and the three-section steam extraction communication main pipe; the final water supply communication main pipe is connected with a boiler water supply pipeline of an outlet of a high-pressure heater system of each unit, a connection point is arranged on the boiler water supply pipeline of a control valve group for isolating the outlet of the high-pressure heater system from an inlet of a boiler water supply economizer, and a single machine is arranged between the connection point and the final water supply communication main pipe to form a control valve group and an isolation valve group of the final water supply communication main pipe; the steam exhaust and communication main pipe of the intermediate pressure cylinder is connected with a steam inlet pipeline from the steam exhaust of the intermediate pressure cylinder to the low pressure cylinder of the steam turbine, a connection point is arranged on a pipeline between an outlet of the intermediate pressure cylinder of the steam turbine and an inlet valve group of the low pressure cylinder of the steam turbine, and a control and isolation valve group from a single machine to the steam exhaust and communication main pipe of the intermediate pressure cylinder is arranged between the connection point and the steam exhaust and communication main pipe of the intermediate pressure cylinder;
the extension system further includes: the low-pressure cylinder steam extraction communication main pipe is connected with a steam extraction pipeline of the low-pressure cylinder of the steam turbine, a connection point is arranged on a pipeline between a steam extraction valve group of the low-pressure cylinder of the steam turbine and a steam inlet valve group of a low-pressure heater system, and a single-machine to low-pressure cylinder steam extraction communication main pipe control and isolation valve group is arranged between the connection point and the low-pressure cylinder steam extraction communication main pipe;
the steam-water system of the steam turbine set comprises a plurality of boilers, wherein an outlet of a superheated steam pipeline of each boiler is communicated with a steam inlet of a high-pressure cylinder, a steam outlet of a high-pressure cylinder is communicated with an inlet of a reheated steam pipeline of the boiler, an outlet of the reheated steam pipeline of the boiler is communicated with a steam inlet of a medium-pressure cylinder, a steam outlet of the medium-pressure cylinder is communicated with a steam inlet of a low-pressure cylinder, a steam outlet of the low-pressure cylinder is communicated with a condenser, a steam outlet of the high-pressure cylinder is communicated with a steam inlet of a high-pressure heating system, a steam outlet of the medium-pressure cylinder is communicated with a steam inlet of a deaerator, a steam outlet of the low-pressure cylinder is communicated with a steam inlet of a low-pressure heating system, the condenser, a condensate pump, the low-pressure heating system, the deaerator and a water feed pump are sequentially communicated with water inlets and water feed pipes of the boilers;
in a plurality of units, when the boiler of the unit 1 is stopped, closing a main steam isolation valve group, a reheating cold section steam isolation valve group and a hot section steam isolation valve group of the boiler of the unit 1, and preventing steam from flowing back to the stopped boiler; opening a main steam communication main pipe control and isolation valve group of the boiler, and supplying main steam to the No. 1 steam turbine and the steam turbine of the unit by the boilers of other units at the same time; opening a control and isolation valve group of a reheat cooling section steam communication main pipe, enabling cold reheat steam of the No. 1 unit to enter the reheat cooling section steam communication main pipe, and enabling boilers of other units to heat the reheat cooling section steam of the No. 1 unit; opening a reheating hot section steam communication main pipe control and isolation valve group, and supplying reheating hot section steam to the No. 1 steam turbine and a middle pressure cylinder of the unit by boilers of other units; closing a steam extraction isolation and control valve of a high-pressure cylinder of the No. 1 unit, opening a steam extraction communication main pipe control and isolation valve group of the high-pressure cylinder of the No. 1 unit, wherein the high-pressure cylinder of the No. 1 unit does not extract steam, and an adjacent unit supplies steam for a high-pressure heater system of the No. 1 unit; closing three-section steam extraction isolation and control valves of the No. 1 unit, opening three-section steam extraction communication main pipe control and isolation valve groups of the No. 1 unit, wherein the No. 1 unit does not perform three-section steam extraction, and adjacent units supply steam for a third-stage high-pressure heater of the No. 1 unit; closing a steam extraction isolation and control valve of the deaerator of the unit No. 1, opening a steam extraction communication main pipe control and isolation valve group of the deaerator of the unit No. 1, wherein the deaerator is not used for steam extraction of the unit No. 1, and the steam inlet and steam supply of the deaerator of the unit No. 1 are performed by adjacent units; opening a steam exhaust communication main pipe control and isolation valve group of the intermediate pressure cylinder of the No. 1 unit, adjusting a steam inlet control and isolation valve group of the low pressure cylinder of the No. 1 unit, enabling the steam exhaust of the intermediate pressure cylinder of the No. 1 steam turbine to enter low pressure cylinders of other units for acting, enabling the low pressure cylinder of the No. 1 steam turbine to be in the lowest steam inlet flow state, enabling the steam inlet flow to meet the lowest cooling steam requirement of the low pressure cylinder, and operating the unit which is transformed into the low pressure cylinder with zero output of the low pressure cylinder in the mode of zero output of the low pressure cylinder; closing a steam extraction isolation and control valve of a low-pressure cylinder of the No. 1 unit, opening a steam extraction communication main pipe control and isolation valve of the low-pressure cylinder, performing no steam extraction on the low-pressure cylinder of the No. 1 unit, and supplying steam to a low-pressure heater system of the No. 1 unit by an adjacent unit; closing an inlet control and isolation valve group of a boiler water supply economizer of the No. 1 unit to prevent feed water from flowing backwards to a boiler shutdown unit, opening a final feed water communication main pipe control and isolation valve group of the No. 1 unit, conveying the heated feed water to boilers of other units, and continuing the next steam-water circulation.
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| CN115013097A (en) * | 2022-05-27 | 2022-09-06 | 华电郑州机械设计研究院有限公司 | Large unit peak shaving system capable of flexibly performing peak shaving operation and operation mode |
| CN115234327B (en) * | 2022-08-08 | 2023-03-10 | 济南达能动力技术有限责任公司 | Unit set cooperative operation method and system |
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| JP2015124710A (en) * | 2013-12-26 | 2015-07-06 | 株式会社東芝 | Control device and activation method |
| CN105756729A (en) * | 2016-04-18 | 2016-07-13 | 国电科学技术研究院 | Supercritical or ultra-supercritical coal-fired electricity generation system adopting main mode |
| CN106050419B (en) * | 2016-06-23 | 2018-08-14 | 章礼道 | Gas turbine presurized water reactor steam turbine combined cycle system |
| CN107388230A (en) * | 2017-08-31 | 2017-11-24 | 冯煜珵 | A kind of joint backheating system |
| CN107747503B (en) * | 2017-11-29 | 2019-07-02 | 东南大学 | A kind of system and operation method of Thermal generation unit Ultra-low load operation |
| CN209604098U (en) * | 2019-02-02 | 2019-11-08 | 华电电力科学研究院有限公司 | A kind of quick start system of energy-efficient Turbo-generator Set |
| CN109653810B (en) * | 2019-02-25 | 2024-03-22 | 哈尔滨锅炉厂有限责任公司 | One furnace with two-machine switching operation thermodynamic system |
| JP7132186B2 (en) * | 2019-07-16 | 2022-09-06 | 三菱重工業株式会社 | Steam power generation plant, modification method of steam power generation plant, and method of operating steam power generation plant |
| CN112303604B (en) * | 2020-10-29 | 2022-09-13 | 西安热工研究院有限公司 | Economizer temperature governing system that unit start-up process denitration was put into |
| CN112696243A (en) * | 2021-01-11 | 2021-04-23 | 吉林省电力科学研究院有限公司 | Low-pressure cylinder zero-output additional energy storage power generation circulating peak shaving system |
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