CN112727556B - Peak regulating system with zero output of low-pressure cylinder, heat storage tank and low-pressure heater coupled - Google Patents
Peak regulating system with zero output of low-pressure cylinder, heat storage tank and low-pressure heater coupled Download PDFInfo
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- CN112727556B CN112727556B CN202110030060.8A CN202110030060A CN112727556B CN 112727556 B CN112727556 B CN 112727556B CN 202110030060 A CN202110030060 A CN 202110030060A CN 112727556 B CN112727556 B CN 112727556B
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- 238000005338 heat storage Methods 0.000 title claims abstract description 151
- 230000001105 regulatory effect Effects 0.000 title description 2
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- 230000008878 coupling Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims description 168
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 144
- 238000009833 condensation Methods 0.000 claims description 14
- 230000005494 condensation Effects 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 238000003303 reheating Methods 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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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
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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
- 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
- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- 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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a peak shaving system with zero output of a low-pressure cylinder and coupling of a heat storage tank and a low-pressure heater, which belongs to the technical field of power generation equipment and comprises a boiler system, a high-pressure cylinder system, a medium-pressure cylinder system, a low-pressure cylinder system, a high-pressure heater system, a deoxidization system, a low-pressure heater system, a condenser system, a heat supply network heater system and a heat storage tank system. The invention is innovated based on a cogeneration unit system which is reformed by zero output of a low-pressure cylinder and is provided with a heat storage tank, so that the zero output of the low-pressure cylinder and the heat storage tank can assist the thermal power unit to participate in deep peak regulation in both a heating period and a non-heating period, on one hand, the problems of impact of the zero output of the low-pressure cylinder on a heating network heater and excessive heating steam in the heating period are solved, and on the other hand, the problems that the zero output of the low-pressure cylinder in the non-heating period and the shutdown of the heat storage tank cannot participate in deep peak regulation are solved.
Description
Technical Field
The invention belongs to the technical field of power generation equipment, and particularly relates to a peak shaving system with zero output of a low-pressure cylinder, a heat storage tank and a low-pressure heater of a cogeneration unit.
Background
In recent years, zero output of a low-pressure cylinder of the cogeneration unit or configuration of a heat storage tank is a widely adopted improvement measure of the cogeneration unit in order to participate in auxiliary peak shaving in a heating period in winter. In the heating period in winter, when the load of the power grid is low, the low-pressure cylinder of the cogeneration unit has zero output or the cogeneration unit provided with the heat storage tank can reduce the power on the internet on the premise of ensuring the heating demand, thereby meeting the peak regulation demand of the power grid. When zero output of a low-pressure cylinder of the cogeneration unit is frequently switched in a heating period, on one hand, the steam parameters and the steam quantity of the heating network heater are frequently changed to cause impact on the heating network heater, and the heating network heater is easy to leak; on the other hand, the steam provided by heating and steam extraction is enough for heat supply when the cylinder is cut, and the steam discharged by the low-pressure cylinder after the cylinder is cut is excessive heat for heat supply. In the non-heating period, the low-pressure cylinder has no heating requirement, zero output is required, the heat storage tank is required to be shut down, and the equipment utilization rate is low.
There is a need in the art for a new solution to this problem.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the peak regulation system with the low-pressure cylinder zero output and the heat storage tank and the low-pressure heater coupled is used for solving the problems that the low-pressure cylinder zero output impacts a heating network heater and heating steam is excessive in a heating period on one hand, and solving the problems that the low-pressure cylinder zero output and the heat storage tank are out of operation and cannot participate in deep peak regulation in a non-heating period on the other hand.
The peak shaving system with zero output of the low pressure cylinder, the coupling of the heat storage tank and the low pressure heater comprises a boiler system, a high pressure cylinder system, a medium pressure cylinder system, a low pressure cylinder system, a high pressure heater system, a deoxidization system, a low pressure heater system, a condenser system, a heat supply network heater system and a heat storage tank system,
The high-pressure cylinder system comprises a high-pressure cylinder, a first section of steam extraction pipe and a second section of steam extraction pipe;
The medium pressure cylinder system comprises a medium pressure cylinder, a third section of steam extraction pipe, a fourth section of steam extraction pipe and a fifth section of steam extraction pipe;
The low pressure cylinder system comprises a low pressure cylinder, a sixth section of steam extraction pipe, a seventh section of steam extraction pipe and an eighth section of steam extraction pipe;
the deaeration system comprises a water supply pump and a deaerator; the water outlet of the deaerator is fixedly connected with the inlet of the water supply pump;
The high-pressure heater system comprises three high-pressure heaters and a water supply tee, wherein the three high-pressure heaters are connected in series, and the three high-pressure heaters are a first high-pressure heater, a second high-pressure heater and a third high-pressure heater in sequence; the inlet of the water supply tee joint is fixedly connected with the outlet of the water supply pump, one outlet of the water supply tee joint is fixedly connected with the inlet of the third high-pressure heater, and the other outlet of the water supply tee joint is connected to the outlet of the first high-pressure heater;
The low-pressure heater system comprises four low-pressure heaters connected in series; the four low-pressure heaters are sequentially a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater, the four low-pressure heaters are respectively provided with a heater inlet electric door, a heater outlet electric door, a bypass and a heater bypass electric door, and steam inlet pipelines of the four low-pressure heaters are respectively provided with a steam extraction electric door and a steam extraction check valve; the outlet of the first low-pressure heater is fixedly connected with the water inlet of the deaerator; the inlet of the fourth low-pressure heater is fixedly connected with an outlet of a condensation water tee joint of the condenser system;
The boiler system comprises a water cooling wall, a superheater and a reheater; the water-cooled wall inlet is fixedly connected with the outlet of the first high-pressure heater, and the water-cooled wall outlet is fixedly connected with the inlet of the superheater; the outlet of the superheater is fixedly connected with the inlet of the high-pressure cylinder through a main steam pipeline; the outlet of the high-pressure cylinder is fixedly connected with the inlet of the reheater; the outlet of the reheater is fixedly connected with the inlet of the medium pressure cylinder through a reheat steam pipeline; the outlet of the medium pressure cylinder is fixedly connected with the inlet of the low pressure cylinder through a pipeline; the inlet of the low-pressure cylinder is also respectively connected with a heat supply network heater of the heat supply network heater system and a heat storage tank of the heat storage tank system, and the outlet of the low-pressure cylinder is fixedly connected with a condenser of the condenser system;
The first section of steam extraction pipe is connected to a first high-pressure heater; the second section of steam extraction pipe is connected to a second high-pressure heater; the third section of steam extraction pipe is connected to a third high-pressure heater; the fourth section of steam extraction pipe is connected to the deaerator; the fifth section of steam extraction pipe is divided into two parts, one part is connected to the first low-pressure heater, and the other part is used as a heating steam extraction pipe and connected to the heat supply network heater; the sixth section of steam extraction pipe is connected to the second low-pressure heater; the seventh section of steam extraction pipe is connected to a third low-pressure heater; the eighth section of steam extraction pipe is connected to the fourth low-pressure heater;
The condenser system comprises a condensate tee joint, a condensate pump and a condenser; the steam side inlet of the condenser is fixedly connected with the steam exhaust port of the low-pressure cylinder, and the condensed water side outlet of the condenser is fixedly connected with the inlet of the condensed water pump; the outlet of the condensate pump is fixedly connected with the inlet of the condensate tee joint; the other outlet of the condensed water tee joint is fixedly connected with the inlet of the heat supply network circulating water side of the heat storage tank through a pipeline;
the heat supply network heater system comprises a heat supply network heater, a heat supply network circulating water pump, a heat supply network tee joint and a heat user; one heat source of the heat supply network heater is communicated with the steam extraction pipe of the first low-pressure heater, the other heat source of the heat supply network heater is steam inlet of the medium-pressure cylinder, and the water drain port of the heat supply network heater is connected to the deaerator; the inlet of the heat supply network circulating water pump is fixedly connected with a heat user, and the outlet of the heat supply network circulating water pump is fixedly connected with the inlet of the heat supply network tee joint; one outlet of the heat supply network tee joint is fixedly connected with a water side inlet of the heat supply network heater, and the other outlet of the heat supply network tee joint is fixedly connected with a water side inlet of the heat storage tank;
The heat storage tank system comprises a heat storage tank, a heat source of the heat storage tank is steam inlet of a low-pressure cylinder, a water drain port of the heat storage tank is connected to a deaerator, a water side outlet of the heat storage tank is fixedly connected with a heat user, and a water side inlet of the heat storage tank is fixedly connected with a side outlet of a heat supply network tee joint.
The steam inlet pipelines of the high-pressure heater are provided with steam extraction electric doors and steam extraction check valves.
The pipeline connecting the low-pressure cylinder with the heat supply network heater and the heat storage tank is respectively provided with a low-pressure cylinder steam inlet to the heat supply network heater and a quick door of the heat storage tank electric door and manual door for low-pressure cylinder steam inlet to heat supply network heater and electric door and manual door for low-pressure cylinder steam inlet to heat storage tank
The electric door and the manual door are arranged on the heat supply network circulating water side inlet pipeline of the heat storage tank and the condensing water tee joint.
The water side inlet and outlet of the heat supply network heater is provided with a water side inlet electric door and a manual door of the heat supply network heater, a water drain pipeline of the heat supply network heater is provided with a water drain electric door of the heat supply network heater, and a water outlet pipeline of the heat supply network heater is provided with a water side outlet electric door and a manual door of the heat supply network heater.
The heat storage tank is a surface type heat exchange heat storage tank.
The heat supply network circulating water side inlet of the heat storage tank is provided with a heat storage tank heat supply network circulating water side inlet electric door and a manual door, the heat storage tank heat supply network circulating water side outlet is provided with a heat storage tank heat supply network circulating water side outlet electric door, the water draining port pipeline of the heat storage tank is provided with a heat storage tank water draining electric door, and the steam side inlet of the heat storage tank is provided with a heat storage tank steam side inlet electric door.
The first section steam extraction pipe, the second section steam extraction pipe, the third section steam extraction pipe, the fourth section steam extraction pipe and the fifth section steam extraction pipe are respectively provided with a steam extraction check valve and a steam extraction electric door.
The fifth section steam extraction pipe is further provided with a fifth section steam extraction to heat supply network heater steam extraction check door, a fifth section steam extraction to heat supply network heater steam extraction fast door, a fifth section steam extraction to heat supply network heater steam extraction electric door and a fifth section steam extraction to heat supply network heater steam extraction manual door on a pipeline connected with the heat supply network heater.
The steam inlet pipeline of the deaerator is provided with a steam extraction check valve and a steam extraction electric door.
Through the design scheme, the invention has the following beneficial effects:
When the load of the power grid is low, the operation of cutting off the low-pressure cylinder is carried out, one part of heat sources of the heat supply network heater come from the fifth section of steam extraction, the other part of heat sources come from the low-pressure cylinder according to the requirements of heat users, redundant heat of the low-pressure cylinder is sent into the heat storage tank, the heat storage tank is utilized to receive part of steam inlet quantity of the low-pressure cylinder when the generated energy is reduced by cutting off the low-pressure cylinder, and the impact on the heat supply network heater caused by a large amount of steam inlet quantity of the low-pressure cylinder entering the heat supply network heater is relieved.
When the power grid load is high, the operation of cutting off the low-pressure cylinder is stopped, heat stored in the low-pressure cylinder is utilized to supply heat to a heat user, whether the fifth section steam extraction is put into a heat source of a heat supply network heater or not can be determined according to the heat utilization requirement of the heat user, and the heat of a heat storage tank is utilized to replace part of the fifth section steam extraction to supply heat to the heat supply network heater, so that the heat utilization requirement of the heat user is met, and the steam extraction of the fifth section to the heat supply network heater is reduced, so that the generating capacity is increased, and the power grid power utilization load requirement is met.
In the non-heating period, closing the electric door and the manual door of the fifth section of steam extraction to the heat supply network heater and the steam inlet of the low-pressure cylinder to the heat supply network heater, and cutting off the heat source of the heat supply network heater; and closing the electric door and the manual door of the inlet and the outlet of the heat supply network heater and the heat storage tank heat supply network circulating water side. When the load of the power grid is low, the operation of cutting off the low-pressure cylinder is carried out, and an electric door and a manual door for feeding steam from the low-pressure cylinder to the heat storage tank are opened at the same time, so that redundant heat from the low-pressure cylinder is cut off and stored in the heat storage tank, and the generating capacity of a unit is reduced by reducing steam feeding of the low-pressure cylinder; when the power grid load peaks, the operation of cutting off the low-pressure cylinder is exited, the electric door and the manual door of the low-pressure cylinder for feeding steam to the heat storage tank are closed, the electric door and the manual door of the heat storage tank for feeding and discharging the condensate water are opened, the heat stored in the heat storage tank is used for heating the condensate water, one or a plurality of low-pressure heaters are reasonably cut off by improving the temperature of the condensate water fed into the low-pressure heaters, and the steam extraction quantity of a low-pressure heater system is reduced, so that the generating capacity of a unit is increased.
The invention is innovated based on a cogeneration unit system which is reformed by zero output of a low-pressure cylinder and is provided with a heat storage tank, so that the zero output of the low-pressure cylinder and the heat storage tank can assist the thermal power unit to participate in deep peak regulation in both a heating period and a non-heating period, on one hand, the problems of impact of the zero output of the low-pressure cylinder on a heating network heater and excessive heating steam in the heating period are solved, and on the other hand, the problems that the zero output of the low-pressure cylinder in the non-heating period and the shutdown of the heat storage tank cannot participate in deep peak regulation are solved.
Drawings
The invention is further described with reference to the drawings and detailed description which follow:
FIG. 1 is a schematic diagram of a low pressure cylinder zero output, thermal storage tank and low pressure heater coupled peak shaving system of the present invention.
In the figure, a boiler system, a 2-high pressure cylinder, a 3-medium pressure cylinder, a 4-low pressure cylinder, a 5-high pressure heater, a 6-water supply tee joint, a 7-water supply pump, an 8-deaerator, a 9-steam extraction check door, a 10-steam extraction electric door, a 11-heater inlet electric door, a 12-heater outlet electric door, a 13-low pressure heater, a 14-heater bypass electric door, a 15-condensate tee joint, a 16-condensate pump, a 17-condenser, a 18-heat storage tank condensate side inlet electric door and a manual door, a 19-heat storage tank condensate side outlet electric door and a manual door, a 20-fifth steam extraction to heat supply network heater steam extraction check door, a 21-fifth steam extraction to heat supply network heater steam extraction quick door, a 22-fifth steam extraction to heat supply network heater steam extraction electric door, a 23-fifth steam extraction to heat supply network heater steam extraction manual door; the method comprises the steps of feeding steam from a 24-low pressure cylinder to a heat supply network heater and closing a heat storage tank fast door, feeding steam from a 25-low pressure cylinder to a heat supply network heater electric door and a manual door, feeding steam from a 26-low pressure cylinder to a heat storage tank electric door and a manual door, draining the heat supply network heater electric door 27-heat supply network heater, heating the water side inlet electric door and the manual door 28-heat supply network heater 29-heat supply network heater, draining the heat supply network electric door and the manual door 30-heat supply network heater water side outlet electric door and the heat storage tank, draining the heat storage tank 31-heat storage tank circulating water side outlet electric door and the manual door 32-heat storage tank, 33-heat storage tank steam side inlet electric door, 34-heat storage tank draining the heat storage tank electric door, 35-heat storage tank circulating water side inlet electric door and the manual door 36-heat user 37-heat supply network circulating water pump and 38-heat supply network tee.
Detailed Description
The invention aims to provide a peak shaving system with zero output of a low-pressure cylinder, a heat storage tank and a low-pressure heater in a coupling way, so that the problems of impact of the zero output of the low-pressure cylinder to the heater of a heating network and surplus heat supply steam in a heating period are solved, and the problems that the zero output of the low-pressure cylinder and the shutdown of the heat storage tank cannot participate in deep peak shaving in a non-heating period are solved.
The invention will be described in detail with reference to fig. 1 and the detailed description thereof:
As shown in the figure, the peak shaving system with zero output of the low pressure cylinder, the coupling of the heat storage tank and the low pressure heater comprises a boiler system 1, a high pressure cylinder system, a medium pressure cylinder system, a low pressure cylinder system, a high pressure heater system, a deoxidization system, a low pressure heater system, a condenser system, a heat supply network heater system and a heat storage tank system,
The high-pressure cylinder system comprises a high-pressure cylinder 2, a first section of steam extraction pipe and a second section of steam extraction pipe;
the medium pressure cylinder system comprises a medium pressure cylinder 3, a third section of steam extraction pipe, a fourth section of steam extraction pipe and a fifth section of steam extraction pipe;
The low pressure cylinder system comprises a low pressure cylinder 4, a sixth section of steam extraction pipe, a seventh section of steam extraction pipe and an eighth section of steam extraction pipe;
The deaeration system comprises a feed pump 7 and a deaerator 8; the water outlet of the deaerator 8 is fixedly connected with the inlet of the water supply pump 7;
The high-pressure heater system comprises three high-pressure heaters 5 and a water supply tee 6 which are connected in series, wherein the three high-pressure heaters 5 which are connected in series are sequentially a first high-pressure heater, a second high-pressure heater and a third high-pressure heater, and steam inlet pipelines of the three high-pressure heaters 5 which are connected in series are respectively provided with a steam extraction electric door 10 and a steam extraction check valve 9; the inlet of the water supply tee 6 is fixedly connected with the outlet of the water supply pump 7, one outlet of the water supply tee 6 is fixedly connected with the inlet of the third high-pressure heater, and the other outlet of the water supply tee 6 is connected to the outlet of the first high-pressure heater;
The low-pressure heater system comprises four low-pressure heaters 13 connected in series; the four low-pressure heaters 13 are sequentially a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater, the four low-pressure heaters are respectively provided with a heater inlet electric door 11, a heater outlet electric door 12, a bypass and a heater bypass electric door 14, and steam inlet pipelines of the four low-pressure heaters are respectively provided with a steam extraction electric door 10 and a steam extraction check valve 9; the outlet of the first low-pressure heater is fixedly connected with the water inlet of the deaerator 8; an inlet of the fourth low-pressure heater is fixedly connected with an outlet of a condensation water tee 15 of the condenser system;
The boiler system 1 comprises a water wall, a superheater and a reheater; the water-cooled wall inlet is fixedly connected with the outlet of the first high-pressure heater, and the water-cooled wall outlet is fixedly connected with the inlet of the superheater; the outlet of the superheater is fixedly connected with the inlet of the high-pressure cylinder 2 through a main steam pipeline; the outlet of the high-pressure cylinder 2 is fixedly connected with the inlet of the reheater; the outlet of the reheater is fixedly connected with the inlet of the medium-pressure cylinder 3 through a reheat steam pipeline; the outlet of the medium pressure cylinder 3 is fixedly connected with the inlet of the low pressure cylinder 4 through a pipeline; the inlet of the low pressure cylinder 4 is also respectively connected with a heat supply network heater 28 of the heat supply network heater system and a heat storage tank 32 of the heat storage tank system, the outlet of the low pressure cylinder 4 is fixedly connected with a condenser 17 of the condenser system, and a pipeline of the low pressure cylinder 4 is respectively provided with a low pressure cylinder steam inlet to the heat supply network heater and a heat storage tank shutter door 24, a low pressure cylinder steam inlet to a heat supply network heater electric door and a manual door 25 and a low pressure cylinder steam inlet to the heat storage tank electric door and a manual door 26;
The first section of steam extraction pipe is connected to a first high-pressure heater; the second section of steam extraction pipe is connected to a second high-pressure heater; the third section of steam extraction pipe is connected to a third high-pressure heater; the fourth section of steam extraction pipe is connected to the deaerator 8; the fifth section of steam extraction pipe is divided into two parts, one part is connected to the first low-pressure heater 13, and the other part is used as a heating steam extraction pipe and connected to the heat supply network heater 28; the sixth section of steam extraction pipe is connected to the second low-pressure heater; the seventh section of steam extraction pipe is connected to a third low-pressure heater; the eighth section of steam extraction pipe is connected to the fourth low-pressure heater;
The condenser system comprises a condensate tee 15, a condensate pump 16 and a condenser 17; the steam side inlet of the condenser 17 is fixedly connected with the steam outlet of the low-pressure cylinder 4, and the condensed water side outlet of the condenser 17 is fixedly connected with the inlet of the condensed water pump 16; the outlet of the condensate pump 16 is fixedly connected with the inlet of the condensate tee 15; the other outlet of the condensation water tee 15 is fixedly connected with a heat supply network circulating water side inlet of the heat storage tank 32 through a pipeline, a heat storage tank condensation water side inlet electric door and a manual door 18 are arranged on the heat supply network circulating water side inlet pipeline of the condensation water tee 15 and the heat storage tank 32, and a heat storage tank condensation water side outlet electric door and a manual door 19 are arranged on the heat supply network circulating water side outlet pipeline of the condensation water tee 15 and the heat storage tank 32;
The heat supply network heater system comprises a heat supply network heater 28, a heat supply network circulating water pump 37, a heat supply network tee 38 and a heat user 36; one heat source of the heat supply network heater 28 is communicated with the first low-pressure heater steam extraction pipe, the other heat source of the heat supply network heater 28 is steam inlet of the medium-pressure cylinder 3, a water drain port of the heat supply network heater 28 is connected to the deaerator 8, a water side inlet electric door and a manual door 29 of the heat supply network heater are arranged at a water side inlet and outlet of the heat supply network heater 28, a heat supply network heater water drain electric door 27 is arranged on a water drain port pipeline of the heat supply network heater 28, and a heat supply network heater water side outlet electric door and a manual door 30 are arranged on a water outlet pipeline of the heat supply network heater 28; an inlet of the heat supply network circulating water pump 37 is fixedly connected with the heat supply user 36, and an outlet of the heat supply network circulating water pump 37 is fixedly connected with an inlet of the heat supply network tee 38; one outlet of the heat supply network tee 38 is fixedly connected with a water side inlet of the heat supply network heater 28, and the other outlet of the heat supply network tee 38 is fixedly connected with a water side inlet of the heat storage tank 32;
The heat storage tank system comprises a surface type heat exchange heat storage tank 32, a heat source of the heat storage tank 32 is steam inlet of a low-pressure cylinder 4, a drain port of the heat storage tank 32 is connected to a deaerator 8, a water side outlet of the heat storage tank 32 is fixedly connected with a heat user 36, a water side inlet of the heat storage tank 32 is also connected with one side outlet of a heat supply network tee 38, a heat supply network circulating water side inlet of the heat storage tank 32 is provided with a heat storage tank heat supply network circulating water side inlet electric door and a manual door 35, a heat storage tank heat supply network circulating water side outlet of the heat storage tank 32 is provided with a heat storage tank heat supply network circulating water side outlet electric door 31, a drain port pipeline of the heat storage tank 32 is provided with a heat storage tank drain electric door 34, and a steam side inlet of the heat storage tank 32 is provided with a heat storage tank steam side inlet electric door 33.
The first section of steam extraction pipe, the second section of steam extraction pipe, the third section of steam extraction pipe, the fourth section of steam extraction pipe and the fifth section of steam extraction pipe are respectively provided with a steam extraction check valve 9 and a steam extraction electric door 10. The steam inlet pipeline of the deaerator is provided with a steam extraction electric door and a steam extraction check valve.
The fifth section steam extraction pipe is further provided with a fifth section steam extraction to heat supply network heater steam extraction check valve 20, a fifth section steam extraction to heat supply network heater steam extraction shutter door 21, a fifth section steam extraction to heat supply network heater steam extraction electric door 22 and a fifth section steam extraction to heat supply network heater steam extraction manual door 23 on a pipeline connected with the heat supply network heater 28.
The steam inlet pipeline of the deaerator 8 is provided with a steam extraction check valve 9 and a steam extraction electric door 10.
In the heating period, the electric door and the manual door 18 at the condensation water side of the heat storage tank and the electric door and the manual door 19 at the condensation water side of the heat storage tank are closed, the electric door 27 for draining the heat supply network heater is opened, the electric door and the manual door 29 at the water side of the heat supply network heater and the electric door and the manual door 30 at the water side of the heat supply network heater are opened, the heat supply network circulating water pump 37 is started, and the heat supply network heater 28 is ensured to normally operate in winter.
When the load of the power grid is low, the electric door and the manual door 31 at the circulating water side of the heat storage tank heat supply network and the electric door and the manual door 35 at the circulating water side of the heat storage tank heat supply network are closed, the electric door 33 at the steam side of the heat storage tank and the electric door 34 for draining the heat storage tank are opened, and the heat storage tank 32 is ensured to be in a heat storage non-heat release state. Opening a fifth section steam extraction to heat supply network heater steam extraction check door 20, a fifth section steam extraction to heat supply network heater steam extraction switch door 21, a fifth section steam extraction to heat supply network heater steam extraction electric door 22 and a fifth section steam extraction to heat supply network heater steam extraction manual door 23, so that a part of heat source of a heat supply network heater 28 is from the fifth section steam extraction; opening the low-pressure cylinder steam inlet to the heat supply network heater and the heat storage tank shutter door 24, cutting off the low-pressure cylinder, adjusting the opening degrees of the low-pressure cylinder steam inlet to the heat supply network heater electric door and the manual door 25 and the low-pressure cylinder steam inlet to the heat storage tank electric door and the manual door 26 according to the requirements of a heat user 36, so that a part of the low-pressure cylinder steam inlet enters the heat supply network heater 28 and a part of the low-pressure cylinder steam inlet enters the heat storage tank 32, and when the low-pressure cylinder is cut off to reduce the generated energy, the heat storage tank 32 is utilized to receive a part of low-pressure cylinder steam inlet quantity, and the impact on the heat supply network heater after a large amount of low-pressure cylinder steam inlet enters the heat supply network heater is relieved.
At the time of power grid load peak, the electric door and manual door 31 at the circulating water side of the heat storage tank heat supply network and the electric door and manual door 35 at the circulating water side of the heat storage tank heat supply network are opened, the electric door 33 at the steam side of the heat storage tank and the electric door 34 for draining the heat storage tank are closed, and the heat storage tank 32 is ensured to be in a heat release and non-heat storage state. Closing the low-pressure cylinder to enter the heat supply network heater and the heat storage tank shutter door 24, exiting the operation of cutting off the low-pressure cylinder 4, utilizing the heat stored by the heat storage tank 32 when the load of the power grid is low to supply heat to the heat consumer 36, determining the opening 23 of the fifth section steam extraction to the heat supply network heater steam extraction shutter door 20, the fifth section steam extraction to the heat supply network heater steam extraction shutter door 21, the fifth section steam extraction to the heat supply network heater steam extraction electric door 22 and the fifth section steam extraction to the heat supply network heater steam extraction manual door according to the heat consumption requirement of the heat consumer 36, and utilizing the heat of the heat storage tank 32 to replace part of the fifth section steam extraction to the heat supply network heater heat to supply heat, thereby not only meeting the heat consumption requirement of the heat consumer 32, but also meeting the power grid power consumption load requirement by reducing the fifth section steam extraction to the heat supply network heater steam extraction so as to increase the power generation capacity.
In the non-heating period, the invention closes a fifth section steam extraction to heat supply network heater steam extraction check door 20, a fifth section steam extraction to heat supply network heater steam extraction quick door 21, a fifth section steam extraction to heat supply network heater steam extraction electric door 22, a fifth section steam extraction to heat supply network heater steam extraction manual door 23, a heat supply network heater drain electric door 27, a heat supply network heater water side inlet electric door and manual door 29, a heat supply network heater water side outlet electric door and manual door 30 and a low-pressure cylinder steam inlet to heat supply network heater electric door and manual door 25, and cuts off a heat supply network heater heat source; the electric and manual door 31 and 35 of the outlet and inlet of the heat accumulating tank and heat accumulating network are closed to stop the heat supplying of the heat accumulating tank 32. When the load of the power grid is low, opening a low-pressure cylinder steam inlet to a heating network heater and a quick door 24 of a heat storage tank and a low-pressure cylinder steam inlet to an electric door and a manual door 26 of the heat storage tank, performing operation of cutting off the low-pressure cylinder 4, cutting off redundant heat of the low-pressure cylinder 4, storing the heat in the heat storage tank 32, and reducing the generating capacity of a unit by reducing the steam inlet of the low-pressure cylinder 4; at the time of power grid load peak, closing low-pressure cylinder steam inlet to a heat supply network heater and a heat storage tank shutter door 24 and low-pressure cylinder steam inlet to a heat storage tank electric door and a manual door 26, exiting the operation of cutting off the low-pressure cylinder 4, opening the heat storage tank condensate water side inlet electric door and the manual door 18 and the heat storage tank condensate water side outlet electric door and the manual door 19, heating the condensate water by using heat stored in a heat storage tank 32, and reducing the steam extraction quantity of a low-pressure heater system by reasonably cutting off one or a plurality of low-pressure heaters 13 by improving the condensate water temperature entering the low-pressure heaters, thereby increasing the generating capacity of a unit.
Claims (8)
1. The peak shaving system with zero output of the low-pressure cylinder, the coupling of the heat storage tank and the low-pressure heater is characterized in that: comprises a boiler system (1), a high-pressure cylinder system, a medium-pressure cylinder system, a low-pressure cylinder system, a high-pressure heater system, an oxygen removal system, a low-pressure heater system, a condenser system, a heat supply network heater system and a heat storage tank system,
The high-pressure cylinder system comprises a high-pressure cylinder (2), a first section of steam extraction pipe and a second section of steam extraction pipe;
the medium pressure cylinder system comprises a medium pressure cylinder (3), a third section of steam extraction pipe, a fourth section of steam extraction pipe and a fifth section of steam extraction pipe;
The low-pressure cylinder system comprises a low-pressure cylinder (4), a sixth section of steam extraction pipe, a seventh section of steam extraction pipe and an eighth section of steam extraction pipe;
the deoxidization system comprises a water supply pump (7) and a deoxidizer (8); the water outlet of the deaerator (8) is fixedly connected with the inlet of the water supply pump (7);
The high-pressure heater system comprises three high-pressure heaters (5) and a water supply tee joint (6) which are connected in series, wherein the three high-pressure heaters (5) which are connected in series are a first high-pressure heater, a second high-pressure heater and a third high-pressure heater in sequence; the inlet of the water supply tee joint (6) is fixedly connected with the outlet of the water supply pump (7), one outlet of the water supply tee joint (6) is fixedly connected with the inlet of the third high-pressure heater, and the other outlet of the water supply tee joint (6) is connected to the outlet of the first high-pressure heater;
The low-pressure heater system comprises four low-pressure heaters (13) connected in series; the four low-pressure heaters (13) are sequentially a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater, the four low-pressure heaters are respectively provided with a heater inlet electric door (11), a heater outlet electric door (12), a bypass and a heater bypass electric door (14), and steam inlet pipelines of the four low-pressure heaters are respectively provided with a steam extraction electric door (10) and a steam extraction check door (9); the outlet of the first low-pressure heater is fixedly connected with the water inlet of the deaerator (8); an inlet of the fourth low-pressure heater is fixedly connected with an outlet of a condensation water tee joint (15) of the condenser system;
The boiler system (1) comprises a water wall, a superheater and a reheater; the water-cooled wall inlet is fixedly connected with the outlet of the first high-pressure heater, and the water-cooled wall outlet is fixedly connected with the inlet of the superheater; the outlet of the superheater is fixedly connected with the inlet of the high-pressure cylinder (2) through a main steam pipeline; the outlet of the high-pressure cylinder (2) is fixedly connected with the inlet of the reheater; the outlet of the reheater is fixedly connected with the inlet of the medium pressure cylinder (3) through a reheating steam pipeline; the outlet of the medium pressure cylinder (3) is fixedly connected with the inlet of the low pressure cylinder (4) through a pipeline; the inlet of the low-pressure cylinder (4) is also respectively connected with a heat supply network heater (28) of the heat supply network heater system and a heat storage tank (32) of the heat storage tank system, and the outlet of the low-pressure cylinder (4) is fixedly connected with a condenser (17) of the condenser system;
The first section of steam extraction pipe is connected to a first high-pressure heater; the second section of steam extraction pipe is connected to a second high-pressure heater; the third section of steam extraction pipe is connected to a third high-pressure heater; the fourth section of steam extraction pipe is connected to a deaerator (8); the fifth section of steam extraction pipe is divided into two parts, one part is connected to the first low-pressure heater (13), and the other part is connected to the heat supply network heater (28) as a heating steam extraction pipe; the sixth section of steam extraction pipe is connected to the second low-pressure heater; the seventh section of steam extraction pipe is connected to a third low-pressure heater; the eighth section of steam extraction pipe is connected to the fourth low-pressure heater;
The condenser system comprises a condensate tee joint (15), a condensate pump (16) and a condenser (17); the steam side inlet of the condenser (17) is fixedly connected with the steam outlet of the low-pressure cylinder (4), and the condensed water side outlet of the condenser (17) is fixedly connected with the inlet of the condensed water pump (16); the outlet of the condensate pump (16) is fixedly connected with the inlet of the condensate tee joint (15); the other outlet of the condensed water tee joint (15) is fixedly connected with the inlet of the heat supply network circulating water side of the heat storage tank (32) through a pipeline;
The heat supply network heater system comprises a heat supply network heater (28), a heat supply network circulating water pump (37), a heat supply network tee joint (38) and a heat supply user (36); one heat source of the heat supply network heater (28) is communicated with the steam extraction pipe of the first low-pressure heater, the other heat source of the heat supply network heater (28) is steam inlet of the medium-pressure cylinder (3), and the water drain port of the heat supply network heater (28) is connected to the deaerator (8); an inlet of the heat supply network circulating water pump (37) is fixedly connected with a heat supply user (36), and an outlet of the heat supply network circulating water pump (37) is fixedly connected with an inlet of a heat supply network tee joint (38); one outlet of the heat supply network tee joint (38) is fixedly connected with a water side inlet of the heat supply network heater (28), and the other outlet of the heat supply network tee joint (38) is fixedly connected with a water side inlet of the heat storage tank (32);
The heat storage tank system comprises a heat storage tank (32), wherein a heat source of the heat storage tank (32) is steam inlet of a low-pressure cylinder (4), a water drain port of the heat storage tank (32) is connected to a deaerator (8), a water side outlet of the heat storage tank (32) is fixedly connected with a heat user (36), and a water side inlet of the heat storage tank (32) is also fixedly connected with a side outlet of a heat supply network tee joint (38);
the steam inlet pipelines of the high-pressure heater (5) are provided with steam extraction electric doors (10) and steam extraction check doors (9);
And a pipeline connected with the low-pressure cylinder (4) and the heat supply network heater (28) and the heat storage tank (32) is respectively provided with a low-pressure cylinder steam inlet to the heat supply network heater and the heat storage tank shutter door (24), a low-pressure cylinder steam inlet to the heat supply network heater electric door and the manual door (25) and a low-pressure cylinder steam inlet to the heat storage tank electric door and the manual door (26).
2. The low pressure cylinder zero force, thermal storage tank and low pressure heater coupled peak shaving system of claim 1, wherein: the heat supply network circulating water side inlet pipeline of the condensation water tee joint (15) and the heat storage tank (32) is provided with a heat storage tank condensation water side inlet electric door and a manual door (18), and the heat storage tank condensation water side outlet electric door and the manual door (19) are arranged on the heat supply network circulating water side outlet pipeline of the condensation water tee joint (15) and the heat storage tank (32).
3. The low pressure cylinder zero force, thermal storage tank and low pressure heater coupled peak shaving system of claim 1, wherein: the water side inlet and outlet of the heat supply network heater (28) is provided with a heat supply network heater water side inlet electric door and a manual door (29), a heat supply network heater water drain electric door (27) is arranged on a water drain port pipeline of the heat supply network heater (28), and a heat supply network heater water side outlet electric door and a manual door (30) are arranged on a water outlet pipeline of the heat supply network heater (28).
4. The low pressure cylinder zero force, thermal storage tank and low pressure heater coupled peak shaving system of claim 1, wherein: the heat storage tank (32) is a surface type heat exchange heat storage tank.
5. The low pressure cylinder zero force, thermal storage tank and low pressure heater coupled peak shaving system of claim 1 or 4, wherein: the heat supply network circulating water side inlet of the heat storage tank (32) is provided with a heat storage tank heat supply network circulating water side inlet electric door and a manual door (35), the heat storage tank heat supply network circulating water side outlet of the heat storage tank (32) is provided with a heat storage tank heat supply network circulating water side outlet electric door (31), a heat storage tank water drain electric door (34) is arranged on a water drain pipeline of the heat storage tank (32), and a steam side inlet of the heat storage tank (32) is provided with a heat storage tank steam side inlet electric door (33).
6. The low pressure cylinder zero force, thermal storage tank and low pressure heater coupled peak shaving system of claim 1, wherein: the first section of steam extraction pipe, the second section of steam extraction pipe, the third section of steam extraction pipe, the fourth section of steam extraction pipe and the fifth section of steam extraction pipe are respectively provided with a steam extraction check valve (9) and a steam extraction electric door (10).
7. The low pressure cylinder zero force, thermal storage tank and low pressure heater coupled peak shaving system of claim 6, wherein: the fifth section steam extraction pipe is further provided with a fifth section steam extraction to heat supply network heater steam extraction check valve (20), a fifth section steam extraction to heat supply network heater steam extraction fast door (21), a fifth section steam extraction to heat supply network heater steam extraction electric door (22) and a fifth section steam extraction to heat supply network heater steam extraction manual door (23) on a pipeline connected with the heat supply network heater (28).
8. The low pressure cylinder zero force, thermal storage tank and low pressure heater coupled peak shaving system of claim 1, wherein: the steam inlet pipeline of the deaerator (8) is provided with a steam extraction check valve (9) and a steam extraction electric door (10).
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