CN113175368B - Boiler steam turbine interconnection system based on main pipe system transformation and operation method - Google Patents
Boiler steam turbine interconnection system based on main pipe system transformation and operation method Download PDFInfo
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- CN113175368B CN113175368B CN202110449597.8A CN202110449597A CN113175368B CN 113175368 B CN113175368 B CN 113175368B CN 202110449597 A CN202110449597 A CN 202110449597A CN 113175368 B CN113175368 B CN 113175368B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000009466 transformation Effects 0.000 title claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000003303 reheating Methods 0.000 claims abstract description 51
- 238000004891 communication Methods 0.000 claims description 122
- 238000000605 extraction Methods 0.000 claims description 98
- 238000002955 isolation Methods 0.000 claims description 75
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 11
- 238000007664 blowing Methods 0.000 abstract description 8
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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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 Steam Boilers And Waste-Gas Boilers (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a boiler and steam turbine interconnection system based on main pipe system reconstruction 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, are in hot standby or are in two-shift operation, the main and reheat steam of the steam turbines of the boiler blowing unit can be obtained by controlling the connecting valve group between each main pipe and the unit, the cold reheat steam of the boiler blowing unit is recycled, and the boiler blowing is not shut down. 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 boiler and steam turbine interconnection system based on main pipe system transformation and an operation method.
Background
In recent years, the technical strength of Chinese power equipment enterprises is continuously improved while the obvious manufacturing cost advantage is kept. According to the field situation, the design, purchase and construction requirements of power plants in different regions are more diversified. With the continuous development of national economy and the change of power utilization structures, power systems face the contradiction that the peak-to-valley difference of power grids is large and the peak regulation capability is insufficient. On the other hand, a large amount of novel clean energy such as photoelectricity and wind power is put into use, and large-scale intermittent energy is used for grid-connected power generation, so that fluctuation of a power grid is increased, and therefore the power grid provides higher requirements for the thermal power generating unit to participate in peak regulation and even deep peak regulation.
In the unit-made unit, because the normal operation of boiler equipment has the lowest limit value to the unit load, the lowest load value of the unit under the deep peak regulation operation condition is limited, and the flexibility of the unit under the deep peak regulation operation condition is greatly reduced; in addition, when the boiler equipment needs to be overhauled, has a fault, runs in two shifts of the unit, is in a hot standby state or needs to be shut down, the matched steam turbine and the generator are forced to stop simultaneously, so that the running flexibility and the generating capacity of the unit are greatly influenced.
The main pipe thermal system is widely used in industrial boilers, power stations without intermediate reheating units and thermal power station boilers in China, and much experience is accumulated in the design and operation of the main pipe thermal system. With the continuous promotion of upgrading and transforming work of thermal power generating units, a system and an operation method capable of realizing interconnection of boilers and turbines among high-capacity thermal power generating units are urgently needed to improve the flexibility of the units under deep peak shaving operation conditions and the generating capacity of the units under accident conditions of boiler equipment.
Disclosure of Invention
The invention aims to provide a boiler and steam turbine interconnection system and an operation method based on main pipe system transformation, so that the flexibility of a unit under a deep peak regulation operation condition and the unit power generation amount of a boiler device under an accident state are improved.
The invention is realized by adopting the following technical scheme:
a kind of interconnected system of boiler steam turbine based on tubular system transformation, including steam-water system and add the system of the steam turbine set; wherein,
the add-on system includes: the main steam communication main pipe, the reheating cold section steam communication main pipe, the reheating hot section steam communication main pipe, the high-pressure cylinder steam extraction communication main pipe, the deaerator steam extraction communication main pipe, the low-pressure cylinder steam extraction communication main pipe and the final water supply 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 low-pressure cylinder steam extraction communication main pipe is connected with a low-pressure cylinder steam extraction to low-pressure heater system pipeline of each unit, a connection point is arranged on a pipeline between the low-pressure cylinder steam extraction valve group and a low-pressure heater system steam inlet valve group, and a single-machine to low-pressure cylinder steam extraction communication main pipe isolation and control valve group is arranged between the connection point and the low-pressure cylinder steam extraction communication main pipe;
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 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 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.
A method for operating interconnected boiler turbines based on header system transformation is based on the interconnected boiler turbine system based on the header system transformation, and takes the shutdown of a boiler of a unit No. 1 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 the steam extraction valve group of the high-pressure cylinder of the No. 1 turbine, opening the steam extraction communication main pipe control and isolation valve group of the high-pressure cylinder, wherein the steam extraction of the high-pressure cylinder of the No. 1 turbine is provided by other units, and the steam extraction of the high-pressure cylinder of the No. 1 turbine is not performed; closing a steam extraction valve group of the deaerator of the No. 1 turbine, opening a steam extraction communication main pipe control and isolation valve group of the deaerator, wherein the steam extraction of the deaerator of the No. 1 turbine is provided by other units, and the steam supply of the deaerator of the machine is not provided by the steam of the steam turbine of the No. 1 turbine; closing the steam extraction valve group of the low-pressure cylinder of the No. 1 turbine, opening the steam extraction communication main pipe control and isolation valve group of the low-pressure cylinder, wherein the steam extraction of the low-pressure cylinder of the No. 1 turbine is provided by other units, and the steam extraction of the low-pressure cylinder of the No. 1 turbine is not performed; closing an isolating and controlling valve group at the inlet of the boiler water supply economizer of the No. 1 unit 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 the feed water pipelines of the boilers 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. by adopting the method, when partial unit boilers are shut down, are in hot standby or are in two-shift operation, the steam turbine of the blowing out 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 blowing out unit is recovered, so that the blowing out is not shut down
2. By adopting the method, the steam turbine of the shutdown unit does not extract steam, and the steam supply of the regenerative system of the shutdown unit is from the adjacent units, so that the operation efficiency of the whole steam turbine of the shutdown unit is improved.
3. 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 medium pressure cylinder steam admission control and an isolation valve bank,
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, a low-pressure cylinder 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, a low-pressure heater system steam inlet control and an isolation valve bank,
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, low-pressure cylinder steam extraction and communication main pipe control and isolation valve group.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the boiler and steam turbine interconnection system based on main pipe system transformation provided by the invention comprises a conventional boiler, a steam-water system of a steam turbine set 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 low-pressure cylinder steam extraction communication main pipe, a final water supply 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, the 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 control and isolation 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 reheating cold section steam pipelines of the boilers of the units, the connection point is arranged on a pipeline between the outlet of a high-pressure cylinder of the steam turbine and a reheating cold section steam control and isolation valve bank Vn-4 of the boiler, 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 boilers of all the units, the connection point is arranged on a pipeline between a boiler reheating thermal section steam control and isolation valve bank Vn-6 and a steam turbine intermediate pressure cylinder steam inlet valve bank Vn-8, and a single machine to a reheating thermal section steam communication main pipe control and isolation valve bank Vn-5 are 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 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 low-pressure cylinder steam extraction to low-pressure heater system pipeline of each unit, a connection point is arranged on a pipeline between the low-pressure cylinder steam extraction valve bank Vn-12 and a low-pressure heater system steam inlet valve bank Vn-15, and a single-machine to low-pressure cylinder steam extraction communication main pipe isolation and control valve bank Vn-20 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 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 to the final water supply communication main pipe control and isolation valve bank Vn-17 are arranged between the connection point and the final water supply communication main pipe.
The invention provides a high-efficiency operation method for interconnecting a boiler and a steam turbine based on main pipe system reconstruction, 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 V1-2, 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 valve group V1-10 of a No. 1 high-pressure cylinder, opening a control valve group V1-18 for steam extraction communication main pipes of the high-pressure cylinder, wherein the steam extraction of the No. 1 high-pressure cylinder is provided by other units, and the steam extraction of the No. 1 high-pressure cylinder is not performed; closing a steam extraction valve group V1-11 of the deaerator of the No. 1 turbine, opening a deaerator steam extraction communication main pipe control and isolation valve group V1-19, wherein the steam extraction of the deaerator of the No. 1 turbine is provided by other units, and the steam supply of the deaerator of the machine is not provided by the steam turbine of the No. 1 turbine; closing a steam extraction valve group V1-12 of a No. 1 low-pressure cylinder, opening a steam extraction communication main pipe control and isolation valve group V1-20 of the low-pressure cylinder, wherein steam extraction of the No. 1 low-pressure cylinder is provided by other units, and no steam extraction is performed at the No. 1 low-pressure cylinder; closing an inlet isolation and control valve group V1-16 of a boiler water supply economizer of the No. 1 unit, preventing feed water from flowing backwards to an off-stream boiler, opening a final feed water communication main pipe control and isolation valve group V1-17, opening final feed water communication main pipe control and isolation valve group Vm-17 of other units, and enabling the final feed water of the No. 1 unit 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.
The following table takes two units as an example, the unit system operation is that the two units are normally operated, the less-furnace multi-machine system operation is that the No. 1 unit boiler is stopped, and the No. 2 unit boiler simultaneously supplies main steam to the No. 1 unit steam turbine and the No. 2 unit steam turbine.
By adopting the method, the boiler and steam turbine interconnection system based on the main pipe system reconstruction can realize further machine-furnace decoupling under the operation condition of 'less furnaces and multiple machines', and further reduce the output power rate of the steam turbine generator unit under the operation condition of deep peak shaving under the normal operation condition of the boiler in operation. By utilizing the invention, under the deep peak regulation operation condition, the steam turbine of the boiler blowing unit can not extract steam, the steam extraction of the regenerative system is from the adjacent unit, and all the steam of the boiler blowing unit enters the steam turbine to apply work, thereby improving the overall efficiency of the steam turbine.
Claims (1)
1. A method for operating interconnected boiler steam turbines based on tubular main system transformation is characterized in that the method is based on a boiler steam turbine interconnected system based on tubular main system transformation, and the system comprises a steam-water system of a steam turbine set and an additional system; wherein,
the extension system includes: 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 low-pressure cylinder steam extraction communication main pipe and a final water supply 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 thermal section steam communication main pipe is connected with reheating thermal section steam pipelines of the boilers of all the units, a connection point is arranged on a pipeline between a boiler reheater steam outlet valve bank and an inlet of a steam turbine intermediate pressure cylinder, and a single machine is arranged between the connection point and the reheating thermal section steam communication main pipe and a reheating thermal section steam communication main pipe control and isolation valve bank;
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 low-pressure cylinder steam extraction communication main pipe is connected with a low-pressure cylinder steam extraction to low-pressure heater system pipeline of each unit, a connection point is arranged on a pipeline between the low-pressure cylinder steam extraction valve group and a low-pressure heater system steam inlet valve group, and a single-machine to low-pressure cylinder steam extraction communication main pipe isolation and control valve group is arranged between the connection point and the low-pressure cylinder 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-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 the steam extraction valve group of the high-pressure cylinder of the No. 1 unit, opening the steam extraction communication main pipe control and isolation valve group of the high-pressure cylinder, wherein the steam extraction of the high-pressure cylinder of the No. 1 steam turbine is provided by other units, and the steam extraction of the high-pressure cylinder of the No. 1 steam turbine is not performed; closing a steam extraction valve group of a deaerator of the unit No. 1, opening a deaerator steam extraction communication main pipe control and isolation valve group, wherein steam extraction of the deaerator of the steam turbine No. 1 is provided by other units, and the steam turbine No. 1 does not provide steam for the deaerator of the steam turbine; closing a steam extraction valve group of a low-pressure cylinder of the No. 1 unit, opening a steam extraction communication main pipe control and isolation valve group of the low-pressure cylinder, wherein the steam extraction of the low-pressure cylinder of the No. 1 steam turbine is provided by other units, and the steam extraction of the low-pressure cylinder of the No. 1 steam turbine is not performed; closing an isolating and controlling valve group at the inlet of the boiler water supply economizer of the unit 1 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 unit 1 to enter the feed water pipelines of the boilers of other units to be reheated to superheated steam.
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