CN113250767A - Four-pipeline main pipe connection system for deep peak shaving and operation method - Google Patents
Four-pipeline main pipe connection system for deep peak shaving and operation method Download PDFInfo
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- CN113250767A CN113250767A CN202110449569.6A CN202110449569A CN113250767A CN 113250767 A CN113250767 A CN 113250767A CN 202110449569 A CN202110449569 A CN 202110449569A CN 113250767 A CN113250767 A CN 113250767A
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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 four-pipeline main pipe connection system for deep peak shaving and an operation method thereof. The additional system is used for respectively communicating the main steam, the reheating cold section steam, the hot section steam, the low-pressure cylinder steam extraction and the final water supply to the corresponding main pipes. When partial unit boilers are shut down, are in hot standby or are in two-shift operation, the steam turbines of the blowing-out unit can obtain main and reheat steam by controlling the main pipes and the inter-unit connecting valve group, the cold reheat steam of the blowing-out unit is recycled, blowing-out is not stopped, and in addition, a condensate pump and a water feed pump of the blowing-out unit do not work, so that more energy is saved. 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 four-pipeline main pipe connection system for deep peak shaving and an operation method.
Background
In order to realize the long-range targets of carbon peak reaching and carbon neutralization, new clean energy sources such as photoelectricity and wind power and the like are continuously and massively built and put into use in future, large-scale grid-connected power generation of the new energy sources further aggravates the volatility of a power grid, and provides new higher requirements for safe and stable operation of the power grid. Under the condition, the participation of the thermal power generating unit in peak regulation and even deep peak regulation becomes an inevitable trend.
At home, a unit system design is widely adopted in a large-capacity thermal power generating unit (more than or equal to 300MW) at present, and the unit always operates in a mode of one boiler and one machine, namely, a single boiler supplies steam for a specific single turbine to generate electricity. Because the normal operation of boiler equipment has the lowest limit value to the load of the unit, the unit operation mode limits the actual deep peak shaving capacity of the unit and reduces the flexibility of the unit under the deep peak shaving operation condition.
As described above, thermal power generating units will undertake more peak shaving tasks due to the development needs of energy strategy, and besides the existing "thermoelectric decoupling" technology that improves the unit flexibility under heat supply conditions, the development of a new technology of deep peak shaving capability under pure condensation conditions becomes a current urgent need.
Disclosure of Invention
The invention aims to provide a four-pipeline main pipe connection system and an operation method for deep peak shaving, so that the flexibility of a unit under the deep peak shaving operation working condition is improved, and the unit still has certain power generation capacity under the accident state of boiler equipment.
The invention is realized by adopting the following technical scheme:
a kind of connection system of four main pipes used for deep peak regulation, including steam-water system of the steam turbine set and adding the 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 final water supply communication main pipe, a condenser hot well water pouring pump, a condenser hot well water communication main pipe and a high-pressure heater system water inlet 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 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;
an inlet of a water pouring pump of the condenser hot well is led out of the condenser hot well through a bypass, an outlet pipeline is provided with a water pouring pump isolating and controlling valve set, and a three-way pipe is arranged behind a valve and is connected with a condensed water communicating main pipe of the hot well;
the hot well condensed water communication main pipe is connected with the hot well condensed water pipeline of each unit condenser, the connection point is arranged on the condensed water pipeline between the hot well outlet and the condensed water pump, a single unit is arranged on the pipeline to the hot well condensed water communication main pipe isolation and control valve group, and the valve group is positioned between the three-way pipe and the right connection point;
the high-pressure heater system water inlet communication main pipe is connected with water inlet pipelines of the high-pressure heater systems of the units, the connection point is arranged on a pipeline between the outlet of the water supply pump and the water inlet of the high-pressure heater system, a single machine is arranged between the connection point and the water inlet communication main pipe of the high-pressure heater system and is isolated and controlled by the high-pressure heater system water inlet communication main pipe, and a water supply pump rear isolation and control valve group is arranged between the connection point and the outlet of the water supply pump.
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 four-large-pipeline main pipe connection system for deep peak shaving is based on the four-large-pipeline main pipe connection system for deep peak shaving, and 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, 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 machine set No. 1 to enter the reheating cold section steam communication main pipe, and heating the reheating cold section steam of the machine set No. 1 by boilers of other machine sets; 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; the machine No. 1 does not perform steam extraction of the deaerator, and the deaerator does not work; no. 1 machine low pressure cylinder does not extract steam, and the low pressure heater system does not work; opening a condenser hot well water pouring pump and a corresponding control and isolation valve group, closing a low-pressure heater system water inlet control and isolation valve group, closing a hot well water communication main pipe control and isolation valve group, pouring all the condensed water of the machine No. 1 to a hot well water communication main pipe to reach other machine set hot wells, and enabling the condensed water of the machine No. 1 to enter other machine set low-pressure heater systems for heating; the condensed water pump and the water supply pump of the No. 1 engine do not operate; opening a water inlet communication main pipe isolation and control valve group of the high-pressure heater system of the machine 1 and other machine sets, and conveying the water supply part of the other machine sets to the high-pressure heater system of the machine 1 for heating; 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 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) compared with the unit system operation, the unit can operate under the working condition of less furnaces and multiple machines, so that the machine and the furnace are decoupled, and the unit still has the power generation capacity under the condition of blowing out;
(2) by adopting the method, the low-pressure heater of a single unit can be withdrawn from operation, condensed water of the condenser is conveyed to the low-pressure heaters of other units for heating, similarly, under the deep peak-shaving operation working condition, a certain boiler can be stopped, high-pressure feed water of a certain steam turbine is reversely conveyed to other units for heating, and the steam inlet quantity of high-pressure cylinders of other units is increased by adjusting, so that the feed water temperature is improved;
(3) by adopting the method, the reheat steam flow and the low-pressure cylinder steam inlet flow of a certain unit can be adjusted and reduced, and the condensed water of the unit is sent to other units for heating, so that the average low-pressure cylinder efficiency of a plurality of units is improved. And moreover, the peak regulation capacity and flexibility of the unit can be obviously improved within a certain range, so that the peak regulation load is further reduced.
(4) When the method is adopted for operation, part of the unit condensate pumps and the water feeding pumps can not work, so that the operation is more energy-saving.
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,
pn-3, condenser hot well water pouring 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, an inlet control and isolation valve bank of a boiler water supply economizer,
vn-11, a final water supply communication main pipe control and isolation valve group,
vn-12, a condenser hot well water pouring pump isolation and control valve bank,
vn-13, a condenser hot well water communication main pipe isolation and control valve group,
vn-14, a high-pressure heater system is communicated with a main pipe isolation and control valve group,
vn-15, a water supply pump rear isolation and control valve group,
vn-16, a low-pressure heater system water inlet control and an isolation valve group.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the invention provides a four-large-pipeline main pipe connection system for deep peak shaving, which 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 final water supply communication main pipe, a condenser hot well water pouring pump, a condenser hot well water communication main pipe, a high-pressure heater system water inlet communication main pipe and a corresponding control and shutoff valve set.
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 steam inlet valve bank Vn-7, and a single machine and a main steam communication main pipe control and isolation valve bank Vn-1 are 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 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-10 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-11 of the final water supply communication main pipe.
The connection mode of the water pouring pump of the condenser hot well in the additionally-arranged system is as follows: an inlet of a water pouring pump Pn-3 of the condenser hot well is led out from the condenser hot well through a bypass, an outlet pipeline is provided with a water pouring pump isolation and control valve bank Vn-12, a three-way pipe is arranged behind the valve and is connected with a hot well condensed water communication main pipe.
The connection mode of the hot well condensed water communication main pipe in the additionally-arranged system is as follows: the hot well condensed water communication main pipe is connected with the hot well condensed water pipeline of each unit condenser, the connection point is arranged on the condensed water pipeline between the hot well outlet and the condensed water pump, a single unit is arranged on the pipeline to the hot well condensed water communication main pipe isolation and control valve bank Vn-13, and the valve bank is arranged between the three-way pipe and the connection point.
The connection mode of the water inlet communication main pipe of the high-pressure heater system in the additionally-arranged system is as follows: the high-pressure heater system water inlet communication main pipe is connected with water inlet pipelines of the high-pressure heater systems of the units, a connection point is arranged on a pipeline between an outlet of a water feeding pump Pn-1 and a water inlet of the high-pressure heater system, a single machine is arranged between the connection point and the water inlet communication main pipe of the high-pressure heater system and a water feeding pump rear isolation and control valve bank Vn-14 is arranged between the connection point and the outlet of the water feeding pump Pn-1.
The invention provides a four-pipeline main pipe connection system for deep peak regulation and an operation method, wherein the operation method comprises the following operation contents by taking the shutdown of a boiler of a No. 1 unit in a plurality of units as an example:
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 the cold reheating steam of the machine set No. 1 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 machine set No. 1 by the 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; the machine No. 1 does not perform steam extraction of the deaerator, and the deaerator does not work; no. 1 machine low pressure cylinder does not extract steam, and the low pressure heater system does not work; opening a condenser hot well water pouring pump P1-3 and a corresponding control and isolation valve group V1-12, closing a low-pressure heater system water inlet control and isolation valve group V1-16, closing a hot well water communication main pipe control and isolation valve group V1-13, pouring all condensed water of the machine No. 1 to a hot well water communication main pipe to reach other machine set hot wells, and enabling the condensed water of the machine No. 1 to enter other machine set low-pressure heater systems for heating; the condensed water pump P1-2 of the No. 1 engine and the water feeding pump P1-1 do not run; opening a water inlet communication main pipe isolation and control valve group V1-14 of the high-pressure heater system of the machine No. 1, opening water inlet communication main pipe isolation and control valve group Vm-14 of the high-pressure heater systems of other machine sets, and conveying the water supply parts of the other machine sets to the high-pressure heater system of the machine No. 1 for heating; closing an inlet control and isolation valve group V1-10 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 V1-11 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.
The four-pipeline main pipe connection system and the operation method for deep peak shaving provided by the invention can realize machine-furnace decoupling of the unit under the operation condition of 'few 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 a boiler in operation. By using the invention, under the operating condition of deep peak regulation, a certain boiler can be stopped, the high-pressure feed water of a certain turbine is reversely fed to other units for heating, and the steam inlet amount of the high-pressure cylinder of other units is increased by regulation, thereby increasing the feed water temperature. In addition, the reheat steam flow and the low-pressure cylinder steam inlet flow of a certain unit can be adjusted and reduced, and the condensed water of the unit is sent to other units for heating, so that the average low-pressure cylinder efficiency of a plurality of units is improved. Because some units condensate pump and feed pump can not work, the operation is more energy-conserving.
Claims (8)
1. A four-large-pipeline main pipe connection system for deep peak shaving is characterized by comprising 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 final water supply communication main pipe, a condenser hot well water pouring pump, a condenser hot well water communication main pipe and a high-pressure heater system water inlet 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 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;
an inlet of a water pouring pump of the condenser hot well is led out of the condenser hot well through a bypass, an outlet pipeline is provided with a water pouring pump isolating and controlling valve set, and a three-way pipe is arranged behind a valve and is connected with a condensed water communicating main pipe of the hot well;
the hot well condensed water communication main pipe is connected with the hot well condensed water pipeline of each unit condenser, the connection point is arranged on the condensed water pipeline between the hot well outlet and the condensed water pump, a single unit is arranged on the pipeline to the hot well condensed water communication main pipe isolation and control valve group, and the valve group is positioned between the three-way pipe and the right connection point;
the high-pressure heater system water inlet communication main pipe is connected with water inlet pipelines of the high-pressure heater systems of the units, the connection point is arranged on a pipeline between the outlet of the water supply pump and the water inlet of the high-pressure heater system, a single machine is arranged between the connection point and the water inlet communication main pipe of the high-pressure heater system and is isolated and controlled by the high-pressure heater system water inlet communication main pipe, and a water supply pump rear isolation and control valve group is arranged between the connection point and the outlet of the water supply pump.
2. The connection system of four main pipe systems for deep peak shaving according to claim 1, wherein the steam-water system of the steam turbine set comprises boilers 1, 2, … …, n, the outlet of the superheated steam pipe 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 reheat steam pipe of the boiler, the outlet of the reheat steam pipe 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, the condenser, the condensate pump, the low-pressure heating system, the deaerator, the feed pump are sequentially communicated with the water inlet and outlet of the high-pressure heating system, the water outlet of the high-pressure heating system is communicated with the inlet of a water feeding pipeline of the boiler.
3. The system according to claim 1, wherein when there are only two units, the two units are connected by a communicating pipe equipped with an isolation and control valve group.
4. An operation method of four-large-pipeline main control connection system for deep peak shaving is characterized in that the method is based on the four-large-pipeline main control connection system for deep peak shaving of any one of claims 1 to 3, and the operation contents are as follows, taking the shutdown of a boiler of a unit No. 1 in a plurality of units as an example:
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; the machine No. 1 does not perform steam extraction of the deaerator, and the deaerator does not work; no. 1 machine low pressure cylinder does not extract steam, and the low pressure heater system does not work; opening a condenser hot well water pouring pump and a corresponding control and isolation valve group, closing a low-pressure heater system water inlet control and isolation valve group, closing a hot well water communication main pipe control and isolation valve group, pouring all the condensed water of the machine No. 1 to a hot well water communication main pipe to reach other machine set hot wells, and enabling the condensed water of the machine No. 1 to enter other machine set low-pressure heater systems for heating; the condensed water pump and the water supply pump of the No. 1 engine do not operate; opening a water inlet communication main pipe isolation and control valve group of the high-pressure heater system of the machine 1 and other machine sets, and conveying the water supply part of the other machine sets to the high-pressure heater system of the machine 1 for heating; 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.
5. The method of claim 4, wherein the boiler outage refers to a condition of boiler maintenance, failure, crew two shift operation, crew hot standby, and all other planned or unexpected outages to the boiler plant.
6. The method of claim 4, wherein the valve set is a control valve used in the four large pipe main control connection system for deep peak shaving.
7. The method of claim 4, wherein the valve block is an isolation valve.
8. The method of claim 6 or 7, wherein the valves are of the type electric, pneumatic, hydraulic and manual.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113586184A (en) * | 2021-09-01 | 2021-11-02 | 贵州电网有限责任公司 | Deep peak regulation method based on main reheating steam communication of thermal power plant |
CN113756898A (en) * | 2021-09-06 | 2021-12-07 | 贵州电网有限责任公司 | Steam turbine constant-speed standby operation method for boiler shutdown of thermal power plant |
-
2021
- 2021-04-25 CN CN202110449569.6A patent/CN113250767A/en not_active Withdrawn
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113586184A (en) * | 2021-09-01 | 2021-11-02 | 贵州电网有限责任公司 | Deep peak regulation method based on main reheating steam communication of thermal power plant |
CN113586184B (en) * | 2021-09-01 | 2024-05-07 | 贵州电网有限责任公司 | Deep peak shaving method based on main reheat steam communication of thermal power plant |
CN113756898A (en) * | 2021-09-06 | 2021-12-07 | 贵州电网有限责任公司 | Steam turbine constant-speed standby operation method for boiler shutdown of thermal power plant |
CN113756898B (en) * | 2021-09-06 | 2023-12-15 | 贵州电网有限责任公司 | Steam turbine constant-speed standby operation method for shutdown of thermal power plant |
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