CN113494322B - System for realizing interconnection between units through main pipe and operation method - Google Patents
System for realizing interconnection between units through main pipe and operation method Download PDFInfo
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- CN113494322B CN113494322B CN202110448396.6A CN202110448396A CN113494322B CN 113494322 B CN113494322 B CN 113494322B CN 202110448396 A CN202110448396 A CN 202110448396A CN 113494322 B CN113494322 B CN 113494322B
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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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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a system for realizing interconnection among units through a main pipe and an operation method. 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 and are in hot standby or in second-class system operation, the main and reheating steam can be obtained by the steam turbine of the blowing-out unit through controlling the connection valve group between each main pipe and the unit, the cold and reheating steam of the blowing-out unit is recovered, the blowing-out is not stopped, in addition, the steam exhausted by the intermediate pressure cylinder of the blowing-out unit is reversely sent to the low pressure cylinder 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 system for realizing interconnection among units through a main pipe and an efficient operation method.
Background
The continuous improvement of the installed capacity of the new energy puts forward higher requirements on the peak regulation capacity of the traditional coal-fired thermal power generating unit, and the continuous increase of the capacity of the new energy can be ensured only if the peak regulation capacity of the coal-fired thermal power generating unit is further improved.
The design of unit system is widely adopted in domestic large-capacity thermal power plants, namely, each boiler only supplies steam for one steam turbine, the steam turbine drives a generator to generate electricity, all units basically have no transverse connection, and part of units are provided with a common auxiliary steam header. Because the boiler equipment can only stably and normally work above the unit load minimum limit value, the unit minimum load value under the deep peak shaving operation working condition is limited, and the flexibility of the unit under the deep peak shaving operation working condition is greatly reduced; in addition, when the boiler equipment has faults, needs to be overhauled, is in a hot standby state, runs in two shifts or needs to be stopped, the matched steam turbine and the generator are forced to stop simultaneously, and therefore the running flexibility and the generating capacity of the unit are greatly influenced.
Disclosure of Invention
The invention aims to provide a system and an operation method for realizing the mutual connection among units through a main pipe, so that the flexibility of the units under the deep peak shaving operation condition and the unit power generation amount under the accident state of boiler equipment are improved.
The invention is realized by adopting the following technical scheme:
a system for realizing the interconnection among units through a main pipe comprises a steam-water system of a steam turbine unit and an additional system; wherein, add the system and include: the hot reheating section is in steam communication with the main pipe and the final water supply communication main pipe;
the hot reheating section steam communication main pipe is connected with a reheating heating section steam pipeline of a boiler, the connection point is arranged on a pipeline between a boiler reheater steam outlet valve bank and a steam turbine intermediate pressure cylinder inlet, and a single machine to hot reheating section steam communication main pipe control and isolation valve bank is arranged between the connection point and the hot reheating section steam communication main pipe;
the final water supply communication main pipe is connected with a boiler water supply pipeline at the outlet of the high-pressure heater system, the 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 is arranged between the connection point and the final water supply communication main pipe to form the control valve group and the isolation valve group of the final water supply communication main pipe.
A further improvement of the present invention is that the add-on system further comprises: the main steam communication main pipe, the cold reheating section steam communication main pipe, the intermediate pressure cylinder steam exhaust communication main pipe and the low pressure cylinder steam extraction 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 cold reheating section steam communication main pipe is connected with a reheating cold section steam pipeline of a boiler, the connection point is arranged on a pipeline between the outlet of a high-pressure cylinder of a steam turbine and a steam inlet valve bank of a boiler reheater, and a single-machine to cold reheating section steam communication main pipe control and isolation valve bank is arranged between the connection point and the cold reheating section steam 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 low-pressure cylinder steam extraction communication main pipe is connected with a steam extraction pipeline of a low-pressure cylinder of a 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 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 two units are used, the two units are connected by using a communicating pipe equipped with an isolation valve group and a control valve group.
An operation method for realizing interconnection among units through a main pipe is based on the system for realizing interconnection among units through the main pipe, and takes the shutdown of a boiler of a unit No. 1 in a plurality of units as an example, the method 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 cold reheating section steam communication main pipe, enabling cold reheating steam of the No. 1 unit to enter the cold reheating section steam communication main pipe, and heating the reheating cold section steam of the No. 1 unit by boilers of other units; opening a hot reheating section steam communication main pipe control and isolation valve group, and supplying reheating section steam to the No. 1 steam turbine and a middle pressure cylinder of the unit by boilers of other units; opening a master pipe control and isolation valve group for communicating exhaust steam of the intermediate pressure cylinder, enabling the exhaust steam of the intermediate pressure cylinder of the steam turbine No. 1 to enter the low pressure cylinder of the steam turbine of other units to do work, enabling the steam turbine No. 1 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 in the low pressure cylinder zero output mode; opening a low-pressure cylinder steam extraction communication main pipe control and isolation valve group, and simultaneously introducing steam extracted from each section of the low-pressure cylinder of the steam turbine of other units into a No. 1 machine and a local low-pressure heater to heat condensed water; closing an isolating and controlling valve group at the inlet of the boiler water supply economizer to prevent feed water from flowing backwards into the off-stream boiler, opening a final feed water communicating main pipe controlling and isolating valve group, and enabling the final feed water of the No. 1 unit to enter boiler feed water pipelines of other units to be reheated to superheated steam.
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 method 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) under the operating condition of one unit and two furnaces, the steam inlet flow of the low-pressure cylinder of a single unit is smaller, the efficiency of the low-pressure cylinder is obviously reduced at the moment, the work share of the low-pressure cylinder in the steam turbine is the largest, and accounts for about 30% -45% of the power output of the whole steam turbine, so that the economical efficiency of the unit under deep peak shaving is greatly influenced. By using the method and the device, the steam inlet quantity of the low-pressure cylinder of the turbine of part of the unit can be completely sent to the low-pressure cylinders of other units under the deep peak regulation operation condition, so that the actual operation efficiency of the low-pressure cylinder averaged by a plurality of units is improved.
(2) 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-2, a condensate pump, Pn-3, a water feed pump, Vn-1, a steam communication main pipe control and an isolation valve bank of a hot reheating section, Vn-2, a steam exhaust communication main pipe control and an isolation valve bank of an intermediate pressure cylinder, Vn-3, a condensate water inlet control and an isolation valve bank of a low pressure heater system, Vn-4, a steam extraction control and an isolation valve bank of a low pressure cylinder, Vn-5, a boiler water supply economizer inlet isolation and a control valve bank, Vn-6, a steam inlet control and an isolation valve bank of a low pressure heater system, Vn-7, a steam extraction communication main pipe control and an isolation valve bank of a low pressure cylinder, Vn-8, a final water supply communication main pipe control and an isolation valve bank, Vn-9, a steam inlet control and an isolation valve bank of a high pressure cylinder, Vn-10, an steam inlet control and an isolation valve bank of an intermediate pressure cylinder, Vn-11, a steam inlet control and an isolation valve bank of a low pressure cylinder, vn-12, a boiler main steam control and isolation valve bank, Vn-13, a reheating cold section steam control and isolation valve bank, Vn-14, a reheating hot section steam control and isolation valve bank, Vn-15, a main steam communication main pipe control and isolation valve bank, Vn-16, a cold reheating section steam communication main pipe control and isolation valve bank.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the system for realizing the interconnection among the units through the main pipe 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 main steam communication main pipe, the cold reheating section steam communication main pipe, the hot reheating section steam communication main pipe, the intermediate pressure cylinder exhaust steam communication main pipe, the low pressure cylinder exhaust steam communication main pipe, the final water supply communication main pipe and the 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-12 and a steam turbine steam inlet valve bank Vn-9, and a single machine and a main steam communication main pipe control and isolation valve bank Vn-15 are arranged between the connection point and the main steam communication main pipe.
The connection mode of the steam communication main pipe of the cold reheating section in the additionally-arranged system is as follows: the cold reheating section steam communication main pipe is connected with a reheating cold section steam pipeline of the boiler, the connection point is arranged on a pipeline between the outlet of a high-pressure cylinder of the steam turbine and a steam inlet valve bank Vn-13 of the reheater of the boiler, and a single machine to cold reheating section steam communication main pipe control and isolation valve bank Vn-16 is arranged between the connection point and the cold reheating section steam communication main pipe.
The connection mode of the hot reheating section steam communication main pipe in the additionally-arranged system is as follows: the hot reheating section steam communication main pipe is connected with a reheating heating section steam pipeline of the boiler, the connection point is arranged on a pipeline between a boiler reheater steam outlet valve bank Vn-14 and an inlet of a steam turbine intermediate pressure cylinder, and a single machine to hot reheating section steam communication main pipe control and isolation valve bank Vn-1 is arranged between the connection point and the hot reheating section steam 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 main exhaust and communication pipe of the intermediate pressure cylinder is connected with an exhaust and low pressure cylinder steam inlet pipeline 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 bank Vn-11 (additionally arranged valve bank) of the low pressure cylinder of the steam turbine, and a single-machine to intermediate pressure cylinder exhaust and communication main pipe control and isolation valve bank Vn-2 is arranged between the connection point and the main exhaust and communication pipe of the intermediate pressure cylinder.
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 the low-pressure cylinder of the steam turbine, a connection point is arranged on a pipeline between a steam extraction valve bank Vn-5 of the low-pressure cylinder of the steam turbine and a steam inlet valve bank Vn-6 of the low-pressure heater system, and a single-machine to low-pressure cylinder steam extraction communication main pipe control and isolation valve bank Vn-7 is arranged between the connection point and the low-pressure cylinder 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 a boiler water supply pipeline at the outlet of the high-pressure heater system, the connection point is arranged on the boiler water supply pipeline of the control valve bank 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 a control and isolation valve bank Vn-8 of the final water supply communication main pipe.
The invention provides an operation method for realizing interconnection among units through a main pipe, which takes the shutdown of a boiler of a No. 1 unit 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 V1-12, the cold reheat section steam isolation valve group V1-13 and the hot reheat section steam isolation valve group V1-14 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 V1-15 of a boiler of the No. 1 unit, and opening main steam communication main pipe control and isolation valve groups Vm-15(m is 2,3,4, …, n, is a 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 cold reheating section steam communication main pipe control and isolation valve group V1-16, enabling cold reheating steam of the No. 1 unit to enter the cold reheating section steam communication main pipe, opening other running unit cold reheating section steam communication main pipe control and isolation valve group Vm-16, and heating the reheating cold section steam of the No. 1 unit by boilers of other units; opening a steam communication main pipe control and isolation valve group V1-1 of the hot reheating section, opening steam communication main pipe control and isolation valve groups Vm-1 of the hot reheating section of other running units, and supplying reheating heating section steam to a No. 1 steam turbine and a middle pressure cylinder of the unit by boilers of other units; opening a steam exhaust communication main pipe control and isolation valve group V1-2 of a medium pressure cylinder, and adjusting a steam inlet control valve group V1-11 of a low pressure cylinder of the No. 1 steam turbine to ensure that most of the steam exhaust of the medium pressure cylinder of the No. 1 steam turbine enters low pressure cylinders of other units to do work, wherein the No. 1 steam turbine is in the lowest steam inlet flow state, the steam inlet flow meets the lowest cooling steam requirement of the low pressure cylinder, and the low pressure cylinder zero-output steam turbine can operate in a low pressure cylinder zero-output mode for a unit which is transformed into a low pressure cylinder zero-output steam; closing a steam extraction valve group V1-4 of a low-pressure cylinder of the No. 1 machine, opening a steam extraction communication main pipe control and isolation valve group V1-7 of the low-pressure cylinder, and simultaneously introducing steam extracted from each section of a low-pressure cylinder of a steam turbine of other units into a low-pressure heater of the No. 1 machine and a low-pressure heater of the machine to heat condensed water; closing an isolation and control valve group V1-5 at an inlet of a boiler water supply economizer to prevent feed water from flowing backwards into an off-stream boiler, opening a final feed water communication main pipe control and isolation valve group V1-8, opening final feed water communication main pipe control and isolation valve groups Vm-8 of other running units, and enabling the final feed water of the unit No. 1 to enter boiler water supply pipelines of other units to be reheated to superheated steam.
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.
The invention provides a system for realizing the mutual connection among units through a main pipe and an operation method. By using the method and the device, the steam inlet quantity of the low-pressure cylinder of the turbine of part of the unit can be completely sent to the low-pressure cylinders of other units under the deep peak regulation operation condition, so that the actual operation efficiency of the low-pressure cylinder averaged by a plurality of units is improved.
Claims (1)
1. An operation method for realizing interconnection among units through a main pipe is characterized in that the method is based on a system for realizing interconnection among units through the main pipe, and the system comprises a steam-water system of a steam turbine unit and an additional system; wherein, add the system and include: the hot reheating section is in steam communication with the main pipe and the final water supply communication main pipe;
the hot reheating section steam communication main pipe is connected with a reheating heating section steam pipeline of a boiler, the connection point is arranged on a pipeline between a boiler reheater steam outlet valve bank and a steam turbine intermediate pressure cylinder inlet, and a single machine to hot reheating section steam communication main pipe control and isolation valve bank is arranged between the connection point and the hot reheating section steam communication main pipe;
the final water supply communication main pipe is connected with a boiler water supply pipeline at the outlet of the high-pressure heater system, 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 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 extension system further includes: the main steam communication main pipe, the cold reheating section steam communication main pipe, the intermediate pressure cylinder steam exhaust communication main pipe and the low pressure cylinder steam extraction 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 cold reheating section steam communication main pipe is connected with a reheating cold section steam pipeline of a boiler, the connection point is arranged on a pipeline between the outlet of a high-pressure cylinder of a steam turbine and a steam inlet valve bank of a boiler reheater, and a single-machine to cold reheating section steam communication main pipe control and isolation valve bank is arranged between the connection point and the cold reheating section steam 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 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 the 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 cold reheating section steam communication main pipe, enabling cold reheating steam of the No. 1 unit to enter the cold reheating section steam communication main pipe, and heating the reheating cold section steam of the No. 1 unit by boilers of other units; opening a hot reheating section steam communication main pipe control and isolation valve group, and supplying reheating section steam to the No. 1 steam turbine and a middle pressure cylinder of the unit by boilers of other units; opening a master pipe control and isolation valve group for communicating exhaust steam of the intermediate pressure cylinder, enabling the exhaust steam of the intermediate pressure cylinder of the steam turbine No. 1 to enter the low pressure cylinder of the steam turbine of other units to do work, enabling the steam turbine No. 1 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 in the low pressure cylinder zero output mode; opening a low-pressure cylinder steam extraction communication main pipe control and isolation valve group, and simultaneously introducing steam extracted from each section of the low-pressure cylinder of the steam turbine of other units into the No. 1 unit and a low-pressure heater of the steam turbine to heat condensed water; closing an isolating and controlling valve group at the inlet of the boiler water supply economizer to prevent feed water from flowing backwards into the off-stream boiler, opening a final feed water communicating main pipe controlling and isolating valve group, and enabling the final feed water of the No. 1 unit to enter boiler feed water pipelines of other units to be reheated to superheated steam.
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| 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 |
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