CN113623034B - Thermoelectric decoupling system with two-stage steam ejector and operation method - Google Patents
Thermoelectric decoupling system with two-stage steam ejector and operation method Download PDFInfo
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- CN113623034B CN113623034B CN202110940475.9A CN202110940475A CN113623034B CN 113623034 B CN113623034 B CN 113623034B CN 202110940475 A CN202110940475 A CN 202110940475A CN 113623034 B CN113623034 B CN 113623034B
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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
- 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
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam 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
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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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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Abstract
The invention discloses a thermoelectric decoupling system with two stages of steam ejectors and an operation method thereof, wherein when the electricity consumption is low, a first-stage steam ejector and a second-stage steam ejector are opened, main steam of a boiler is used for ejecting reheat steam of the boiler through the first-stage steam ejector, outlet steam of the first-stage steam ejector is used for conveying industrial steam outwards, a heat storage tank is subjected to heat storage through a heat storage heat exchanger, an outlet of the second-stage steam ejector is used for primarily heating return water of a heat supply network, and the heat storage tank is used for reheating return water of the heat supply network; when the power consumption is in a peak, the first-stage steam ejector is opened, the second-stage steam ejector is closed, the heat storage tank is used for releasing heat to heat the return water of the heat supply network, and after the heat of the heat storage tank is reduced, the first-stage steam ejector and the second-stage steam ejector are opened, and at the moment, the outlet steam of the second-stage steam ejector is used for heating the return water of the heat supply network; the two-stage steam ejector ensures the stability of a heating system and an industrial steam system, and utilizes steam of different grades to a greater extent to realize gradient utilization of energy.
Description
Technical Field
The invention relates to the technical field of cogeneration, in particular to a heat and power decoupling system with two stages of steam ejectors and an operation method.
Background
In the energy structure of China, thermal power is still used as a main power source at present, the power consumption for peak regulation is small, so that a thermal power unit also plays the role of power peak regulation and frequency regulation, and a thermoelectric power unit also plays the role of steam supply and heating in the heating period, so that the thermal power plant at the present stage also needs to perform thermoelectric decoupling so as to meet the requirement of deep peak regulation.
The method has the advantages that the flexibility transformation is carried out on the cogeneration unit, the peak regulation capacity of the unit is improved, the generated energy of the thermal power generating unit can be reduced to the minimum to a certain extent, and the problems of metal fatigue and safety caused by frequent start and stop are avoided although the generating efficiency of the unit is lower than the design requirement. The main method for improving the flexibility of the thermoelectric unit is thermoelectric decoupling, measures such as building a new thermal power plant and increasing the unit are usually adopted to meet the requirement of a thermal user and reduce peak-valley energy utilization difference, but the investment cost is increased, the unit capacity is excessive and cannot be consumed in time in night energy utilization valley period, and the unit efficiency is low during low-load operation. Therefore, implementing thermoelectric decoupling is a way to increase the flexibility and economy of thermoelectric power generation units.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a thermoelectric decoupling system with two-stage steam injectors and an operating method thereof, the system is coupled with a thermal storage steam supply heating system under a conventional thermal power unit, the system can be used in a city with heating steam demand, when the power consumption is low, the redundant heat and electric energy are stored, and when the power consumption is high, the stored heat energy is used for heating of a heat user, so as to reduce the start and stop of the thermal power unit and improve the flexibility of the thermal power unit.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a thermoelectric decoupling system with two-stage steam ejectors comprises a boiler 1, a steam turbine high-pressure cylinder 2, a steam turbine intermediate-pressure cylinder 3, a steam turbine low-pressure cylinder 4, a condenser 5, a condensate pump 6, a low-pressure heater 7, a deaerator 8, a water feed pump 9, a high-pressure heater 10, a primary steam ejector 11, a heat storage heat exchanger 12, a secondary steam ejector 13, a heat supply network backwater primary heater 14, a heat supply network water pump 15, a heat supply network backwater secondary heater 16, a circulating pump 17, a heat storage tank 18, a circulating pump 19, an electric boiler 20, a primary steam ejector power steam pipeline regulating valve 101, a primary steam ejector injection steam extraction pipeline regulating valve 102, a secondary steam ejector injection steam extraction bypass regulating valve 103, a secondary steam ejector injection steam extraction pipeline regulating valve 104, a secondary steam ejector power steam bypass regulating valve 105, a secondary steam ejector power steam pipeline regulating valve 106 and a industrial steam regulating valve 107;
the main steam outlet of the boiler 1 is connected with the inlet of the steam turbine high-pressure cylinder 2, the outlet of the steam turbine high-pressure cylinder 2 is connected with the reheating inlet of the boiler 1, the reheating outlet of the boiler 1 is sequentially connected with the steam turbine medium-pressure cylinder 3 and the steam turbine low-pressure cylinder 4, the outlet of the steam turbine low-pressure cylinder 4 is connected with the condenser 5, the condensate pump 6, the low-pressure heater 7, the deaerator 8, the feed pump 9 and the high-pressure heater 10 in series, and the outlet of the high-pressure heater 10 is connected with the feed water inlet of the boiler 1; the main steam outlet of the boiler 1 is also communicated with a power steam pipeline regulating valve 101 of a primary steam ejector and a power steam inlet pipeline of a primary steam ejector 11 in sequence; an injection steam inlet of the primary steam ejector 11 is communicated with a reheat steam outlet of the boiler 1 through an injection steam extraction pipeline regulating valve 102 of the primary steam ejector; the outlet of the primary steam ejector 11 is connected with an industrial steam regulating valve 107, while the outlet of the primary steam ejector 11 is connected with the steam inlet of the heat storage heat exchanger 12 and is connected with the power steam inlet of the secondary steam ejector 13 through a power steam bypass regulating valve 105 of the secondary steam ejector; the steam outlet of the heat storage heat exchanger 12 is connected with the power steam inlet of the secondary steam ejector 13 through a power steam pipeline adjusting valve 106 of the secondary steam ejector; an inlet of the secondary steam ejector 13 for ejecting steam is connected with an outlet of the steam turbine low pressure cylinder 4 through a secondary steam ejector ejection steam extraction pipeline regulating valve 104, and is connected with an outlet of the steam turbine intermediate pressure cylinder 3 through a secondary steam ejector ejection steam extraction bypass regulating valve 103; the outlet of the secondary steam ejector 13 is connected with the steam inlet of the heat supply network backwater primary heater 14; the drainage outlet of the heat supply network backwater primary heater 14 is communicated with the inlet of the deaerator 8;
the outlet of the heat absorption end of the heat storage tank 18 is communicated with the inlet of an electric boiler 20 through a second circulating pump 19; the outlet of the electric boiler 20 is communicated with the inlet of the heat absorption end of the heat accumulation heat exchanger 12; the outlet of the heat absorption end of the heat storage heat exchanger 12 is communicated with the inlet of the heat absorption end of the heat storage tank 18; the heat release end outlet of the heat storage tank 18 is connected with the heat release end inlet of the heat supply network backwater secondary heater 16 through a first circulating pump 17, and the heat release end outlet of the heat supply network backwater secondary heater 16 is communicated with the heat release end inlet of the heat storage tank 18; the heat supply network water return pipeline is connected with a heat absorption end inlet of the heat supply network water return primary heater 14, a heat absorption end outlet of the heat supply network water return primary heater 14 is connected with a heat absorption end inlet of the heat supply network water return secondary heater 16, and a heat absorption end outlet of the heat supply network water return secondary heater 16 is communicated with a heat supply network water supply pipeline through a heat supply network water pump 15.
According to the thermoelectric decoupling system with the two-stage steam ejector and the operation method, when the power consumption of a thermal power plant is low, the working states of the first-stage steam ejector 11 and the second-stage steam ejector 13 are flexibly controlled by setting the opening of the steam pipeline regulating valves 101-106, on the premise that the normal work of a power supply and heat supply system is guaranteed, redundant heat is stored and utilized to a higher degree, and thermoelectric decoupling and gradient utilization of energy are achieved.
The power steam of the primary steam ejector 11 comes from main steam, and the injection steam comes from reheat steam, so that the outlet temperature of the primary steam ejector 11 is 500-550 ℃.
The power steam of the primary steam ejector 11 comes from main steam, so the adjustable range of the outlet steam pressure of the primary steam ejector 11 is 1-4MPa, and the adjustable range of industrial steam is larger.
The temperature difference stored in the heat storage tank 18 is 100-550 ℃.
The power steam source of the secondary steam ejector 13 is adjustable, the power steam can be switched through the power steam pipeline adjusting valve 106 of the secondary steam ejector and the power steam bypass adjusting valve 105 of the secondary steam ejector, and the power steam can be flexibly switched to meet the heating requirement of a heat user according to the requirement of the heat supply load.
The two-stage steam ejector 13 is adjustable in ejection steam source, ejection steam can be switched through the two-stage steam ejector ejection steam extraction pipeline adjusting valve 104 and the two-stage steam ejector ejection steam extraction bypass adjusting valve 103, heat supply is met, meanwhile, low-grade steam sources are switched according to different loads of a power plant, and the purpose of energy conservation is achieved by utilizing the steam of different grades.
The injection steam of the secondary steam ejector 13 comes from the exhaust of the steam turbine, and the energy utilization efficiency is high by utilizing the waste heat of the exhaust.
The electric boiler 20 primarily heats the heat storage medium by using the surplus electric energy, so that the utilization efficiency of the energy is improved.
The thermoelectric decoupling system with the two-stage steam ejector and the operation method thereof comprise a heat storage tank heat absorption operation mode, a heat storage tank heat release operation mode and a heat storage tank failure operation mode, and specifically comprise the following steps:
heat absorption operation mode of the heat storage tank: when the power plant is in the valley operation of electricity consumption, the primary steam ejector 11 and the secondary steam ejector 13 are both in working states at the time, the heat storage tank 18 is in heat absorption operation, the heat storage tank 18 absorbs heat and releases heat at the same time, return water of a heat supply network is heated at low temperature by the primary return water heater 14 of the heat supply network and at high temperature by the secondary return water heater 16 of the heat supply network, the requirement of water supply of the heat supply network is met, and meanwhile, outlet steam of the primary steam ejector 11 externally conveys industrial steam; at this time, the primary steam ejector 11 extracts the main steam generated by the steam boiler 1 and ejects the reheated steam of the boiler 1; at the moment, the power steam pipeline regulating valve 101 of the primary steam ejector is opened, the injection steam extraction pipeline regulating valve 102 of the primary steam ejector is opened, and meanwhile, the industrial steam regulating valve 107 is opened to convey industrial steam outwards; the secondary steam ejector motive steam line regulating valve 106 is opened, the secondary steam ejector motive steam bypass regulating valve 105 is closed, and the connection with the outlet of the primary steam ejector 11 is cut off; the secondary steam ejector ejects the steam extraction bypass regulating valve 103 to close, and cuts off the connection with the exhaust of the steam turbine intermediate pressure cylinder, and the secondary steam ejector ejects the steam extraction pipeline regulating valve 104 to open; the outlet steam of the primary steam ejector 11 passes through the heat storage heat exchanger 12 and then enters the secondary steam ejector 13 as power steam to eject the exhaust of the steam turbine low pressure cylinder 4; steam at the outlet of the secondary steam ejector 13 enters a heat supply network backwater primary heater 14, and the drained water after heat release flows into a deaerator 8; at this time, the low-temperature heat storage medium in the heat storage tank 18 passes through the circulating pump 19 to be primarily heated in the electric boiler 20 by using redundant electric energy, and then enters the heat storage heat exchanger 12 to absorb heat to become a high-temperature heat storage medium; the high-temperature heat storage medium of the heat storage tank 18 is subjected to heat release in a heat supply network backwater secondary heater 16 through a circulating pump 17 to heat supply network backwater; the return water of the heat supply network is primarily heated by a return water primary heater 14 of the heat supply network, and then heated to the temperature required by heat supply by a return water secondary heater 16 of the heat supply network, so as to carry out external heat supply;
the heat storage tank heat release operation mode is as follows: when the power plant is in power consumption peak operation, the first-stage steam ejector 11 is in a working state, the second-stage steam ejector 13 is in a closed state, the heat storage tank 18 is in pure heat release operation, the return water of the heat supply network directly passes through the return water secondary heater 16 of the heat supply network for high-temperature heating, the requirement of water supply of the heat supply network is met, and meanwhile, the steam at the outlet of the first-stage steam ejector 11 is used for conveying industrial steam outwards; at the moment, the power steam pipeline regulating valve 101 of the primary steam ejector is opened, the injection steam extraction pipeline regulating valve 102 of the primary steam ejector is opened, and meanwhile, the industrial steam regulating valve 107 is opened to convey industrial steam outwards; the power steam pipeline regulating valve 106 of the secondary steam ejector is closed, the power steam bypass regulating valve 105 of the secondary steam ejector is closed, the injection steam extraction bypass regulating valve 103 of the secondary steam ejector is closed, the injection steam extraction bypass regulating valve 104 of the secondary steam ejector is closed, and the primary steam ejector 11 and the secondary steam ejector 13 are both in a closed state; at this time, the endothermic process in the heat storage tank 18 is stopped; the high-temperature heat storage medium of the heat storage tank 18 is subjected to heat release in a heat supply network backwater secondary heater 16 through a circulating pump 17 to heat supply network backwater; the return water of the heat supply network is directly heated to the temperature required by heat supply through a secondary heater 16 of the return water of the heat supply network, and is output for heat supply;
failure operation mode of the heat storage tank: when the heat supply capacity of the heat storage tank 18 is insufficient, the first-stage steam ejector 11 and the second-stage steam ejector 13 are both in an opening state at the moment, the heat storage tank 18 is in a closing state, the heat supply network backwater is directly heated to the requirement of heat supply and outward transportation through the heat supply network backwater primary heater 14, and meanwhile, the steam at the outlet of the first-stage steam ejector 11 is used for outward transportation of industrial steam; at the moment, the power steam pipeline regulating valve 101 of the primary steam ejector is opened, the injection steam extraction pipeline regulating valve 102 of the primary steam ejector is opened, and meanwhile, the industrial steam regulating valve 107 is opened to convey industrial steam outwards; the power steam pipeline regulating valve 106 of the secondary steam ejector is closed, the power steam bypass regulating valve 105 of the secondary steam ejector is opened, the secondary steam ejector injects the steam extraction bypass regulating valve 103 to be opened, the secondary steam ejector injects the steam extraction bypass regulating valve 104 to be closed, the outlet steam of the primary steam ejector 11 is used as the power steam with the secondary steam ejector 13 and injects the exhaust of a steam turbine intermediate pressure cylinder, and the outlet steam of the secondary steam ejector 13 enters the heat supply network backwater primary heater 14 to heat the heat supply network backwater; at this time, the heat absorption and release processes in the heat storage tank 18 are stopped; the return water of the heat supply network is directly heated to the temperature required by heat supply through the primary return water heater 14 of the heat supply network, and the heat is output for heat supply.
Compared with the prior art, the invention can achieve the following beneficial effects:
(1) The heat storage tank and the steam ejector are used for supplying heat in a combined mode, and thermoelectric decoupling can be achieved.
(2) The temperature range of the heat storage tank is 100-550 ℃, the temperature difference is large, and the needed heat storage medium is less.
(3) The power steam source of the primary steam ejector is main steam, so that the adjustable range of industrial steam is wider.
(4) The power steam source and the injection steam source of the secondary steam ejector are adjustable, so that the low-grade steam source can be utilized while heating is guaranteed.
(5) The ejection steam source of the secondary steam ejector is derived from the exhaust of the steam turbine, the waste heat of the exhaust is utilized, and the energy utilization efficiency is high.
(6) The electric boiler 20 primarily heats the heat storage medium by using the surplus electric energy, thereby improving the utilization efficiency of the energy.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
The specific implementation mode is as follows:
as shown in fig. 1, the thermoelectric decoupling system with two-stage steam ejector of the present invention comprises a boiler 1, a turbine high pressure cylinder 2, a turbine medium pressure cylinder 3, a turbine low pressure cylinder 4, a condenser 5, a condensate pump 6, a low pressure heater 7, a deaerator 8, a water feed pump 9, a high pressure heater 10, a first-stage steam ejector 11, a heat storage heat exchanger 12, a second-stage steam ejector 13, a heat supply network backwater primary heater 14, a heat supply network water pump 15, a heat supply network backwater secondary heater 16, a circulating pump 17, a heat storage tank 18, a circulating pump 19, an electric boiler 20, a first-stage steam ejector power steam pipeline regulating valve 101, a first-stage steam ejector injection steam extraction pipeline regulating valve 102, a second-stage steam ejector steam extraction bypass regulating valve 103, a second-stage steam ejector injection steam extraction pipeline regulating valve 104, a second-stage steam ejector power steam bypass regulating valve 105, a second-stage steam ejector power steam pipeline regulating valve 106, and a industrial steam regulating valve 107;
the main steam outlet of the boiler 1 is connected with the inlet of the steam turbine high-pressure cylinder 2, the outlet of the steam turbine high-pressure cylinder 2 is connected with the reheating inlet of the boiler 1, the reheating outlet of the boiler 1 is sequentially connected with the steam turbine intermediate-pressure cylinder 3 and the steam turbine low-pressure cylinder 4, the outlet of the steam turbine low-pressure cylinder 4 is connected with a gas condenser 5, a condensate pump 6, a low-pressure heater 7, a deaerator 8, a water feed pump 9 and a high-pressure heater 10 in series, and the outlet of the high-pressure heater 10 is connected with the water feed inlet of the boiler 1; the main steam outlet of the boiler 1 is also communicated with a power steam pipeline regulating valve 101 of a primary steam ejector and a power steam inlet pipeline of a primary steam ejector 11 in sequence; the injection steam inlet of the primary steam ejector 11 is communicated with the reheat steam outlet of the boiler 1 through the injection steam extraction pipeline regulating valve 102 of the primary steam ejector; the outlet of the primary steam ejector 11 is connected with the industrial steam regulating valve 107, while the outlet of the primary steam ejector 11 is connected with the steam inlet of the heat storage heat exchanger 12 and is connected with the power steam inlet of the secondary steam ejector 13 through the power steam bypass regulating valve 105 of the secondary steam ejector; the steam outlet of the heat storage heat exchanger 12 is connected with the power steam inlet of the secondary steam ejector 13 through a power steam pipeline adjusting valve 106 of the secondary steam ejector; the inlet of the secondary steam ejector 13 for injecting steam is connected with the outlet of the steam turbine low pressure cylinder 4 through the secondary steam ejector for injecting a steam extraction pipeline regulating valve 104, and is connected with the outlet of the steam turbine intermediate pressure cylinder 3 through the secondary steam ejector for injecting a steam extraction bypass regulating valve 103; the outlet of the secondary steam ejector 13 is connected with the steam inlet of the heat supply network backwater primary heater 14; the drainage outlet of the heat supply network backwater primary heater 14 is communicated with the inlet of the deaerator 8; the outlet of the heat absorption end of the heat storage tank 18 is communicated with the inlet of an electric boiler 20 through a second circulating pump 19; the outlet of the electric boiler 20 is communicated with the inlet of the heat absorption end of the heat accumulation heat exchanger 12; the outlet of the heat absorption end of the heat storage heat exchanger 12 is communicated with the inlet of the heat absorption end of the heat storage tank 18; the heat release end outlet of the heat storage tank 18 is connected with the heat release end inlet of the heat supply network backwater secondary heater 16 through a first circulating pump 17, and the heat release end outlet of the heat supply network backwater secondary heater 16 is communicated with the heat release end inlet of the heat storage tank; the heat supply network water return pipeline is connected with a heat absorption end inlet of the heat supply network water return primary heater 14, a heat absorption end outlet of the heat supply network water return primary heater 14 is connected with a heat absorption end inlet of the heat supply network water return secondary heater 16, and a heat absorption end outlet of the heat supply network water return secondary heater 16 is communicated with a heat supply network water supply pipeline through a heat supply network water pump 15.
The operation method of the thermoelectric decoupling system with the two-stage steam ejector can be operated according to the following modes:
the heat absorption operation mode of the heat storage tank is as follows: when the power plant is in the valley operation of electricity consumption, the first-stage steam ejector 11 and the second-stage steam ejector 13 are both in working states at this moment, the heat storage tank 18 is in heat absorption operation, the heat storage tank 18 absorbs heat and releases heat simultaneously, the heat supply network backwater is heated at low temperature by the heat supply network backwater primary heater 14 and at high temperature by the heat supply network backwater secondary heater 16, the requirement of heat supply network water supply is met, and meanwhile, the outlet steam of the first-stage steam ejector 11 is used for conveying industrial steam outwards. At this time, the primary steam ejector 11 extracts the main steam generated by the steam boiler 1 and ejects the reheated steam of the boiler 1; at the moment, the power steam pipeline regulating valve 101 of the primary steam ejector is opened, the injection steam extraction pipeline regulating valve 102 of the primary steam ejector is opened, and meanwhile, the industrial steam regulating valve 107 is opened to convey industrial steam outwards; the secondary steam ejector motive steam line regulating valve 106 is opened, the secondary steam ejector motive steam bypass regulating valve 105 is closed, and the connection with the outlet of the primary steam ejector 11 is cut off; the secondary steam ejector ejects the steam extraction bypass regulating valve 103 to close, and cuts off the connection with the exhaust of the steam turbine intermediate pressure cylinder, and the secondary steam ejector ejects the steam extraction pipeline regulating valve 104 to open; the outlet steam of the primary steam ejector 11 passes through the heat storage heat exchanger 12 and then enters the secondary steam ejector 13 as power steam to eject the exhaust of the steam turbine low pressure cylinder 4; steam at the outlet of the secondary steam ejector 13 enters a heat supply network backwater primary heater 14, and the drained water after heat release flows into a deaerator 8; at this time, the low-temperature heat storage medium in the heat storage tank 18 passes through the circulating pump 19 to be primarily heated in the electric boiler 20 by using redundant electric energy, and then enters the heat storage heat exchanger 12 to absorb heat to become a high-temperature heat storage medium; the high-temperature heat storage medium of the heat storage tank 18 is subjected to heat release in a heat supply network backwater secondary heater 16 through a circulating pump 17 to heat supply network backwater; the return water of the heat supply network is primarily heated by the primary return water heater 14 of the heat supply network, and then heated to the temperature required by heat supply by the secondary return water heater 16 of the heat supply network, so as to carry out external heat supply.
The heat storage tank heat release operation mode is as follows: when the power plant is in power consumption peak operation, the first-stage steam ejector 11 is in a working state, the second-stage steam ejector 13 is in a closed state, the heat storage tank 18 is in pure heat release operation, the heat supply network backwater is directly heated at high temperature by the heat supply network backwater secondary heater 16, the requirement of heat supply network water supply is met, and meanwhile, the outlet steam of the first-stage steam ejector 11 is used for conveying industrial steam outwards. At the moment, the power steam pipeline regulating valve 101 of the primary steam ejector is opened, the injection steam extraction pipeline regulating valve 102 of the primary steam ejector is opened, and meanwhile, the industrial steam regulating valve 107 is opened to convey industrial steam outwards; the power steam pipeline regulating valve 106 of the secondary steam ejector is closed, the power steam bypass regulating valve 105 of the secondary steam ejector is closed, the injection steam extraction bypass regulating valve 103 of the secondary steam ejector is closed, the injection steam extraction bypass regulating valve 104 of the secondary steam ejector is closed, and the primary steam ejector 11 and the secondary steam ejector 13 are both in a closed state; at this time, the endothermic process in the heat storage tank 18 is stopped; the high-temperature heat storage medium of the heat storage tank 18 is subjected to heat release in a heat supply network backwater secondary heater 16 through a circulating pump 17 to heat supply network backwater; the return water of the heat supply network is directly heated to the temperature required by heat supply through the return water secondary heater 16 of the heat supply network, and the heat is output and supplied.
Failure operation mode of the heat storage tank: when the heat supply capacity of the heat storage tank 18 is insufficient, the first-stage steam ejector 11 and the second-stage steam ejector 13 are both in an opening state at the moment, the heat storage tank 18 is in a closing state, the heat supply network backwater is directly heated to the requirement of heat supply and outward transportation through the heat supply network backwater primary heater 14, and meanwhile, the outlet steam of the first-stage steam ejector 11 is used for outward transportation of industrial steam. At the moment, the power steam pipeline regulating valve 101 of the primary steam ejector is opened, the injection steam extraction pipeline regulating valve 102 of the primary steam ejector is opened, and meanwhile, the industrial steam regulating valve 107 is opened to convey industrial steam outwards; the power steam pipeline regulating valve 106 of the secondary steam ejector is closed, the power steam bypass regulating valve 105 of the secondary steam ejector is opened, the secondary steam ejector injects the steam extraction bypass regulating valve 103 to be opened, the secondary steam ejector injects the steam extraction bypass regulating valve 104 to be closed, the outlet steam of the primary steam ejector 11 is used as the power steam with the secondary steam ejector 13 and injects the exhaust of a steam turbine intermediate pressure cylinder, and the outlet steam of the secondary steam ejector 13 enters the heat supply network backwater primary heater 14 to heat the heat supply network backwater; at this time, the heat absorption and release processes in the heat storage tank 18 are stopped; the return water of the heat supply network is directly heated to the temperature required by heat supply through the primary return water heater 14 of the heat supply network, and the heat is output for heat supply.
Claims (8)
1. A method of operating a thermoelectric decoupling system with two stages of steam injectors, comprising: the system comprises a boiler (1), a high-pressure steam turbine cylinder (2), a medium-pressure steam turbine cylinder (3), a low-pressure steam turbine cylinder (4), a condenser (5), a condensate pump (6), a low-pressure heater (7), a deaerator (8), a water feed pump (9), a high-pressure heater (10), a primary steam ejector (11), a heat storage heat exchanger (12), a secondary steam ejector (13), a primary heat supply network water return heater (14), a heat supply network water pump (15), a secondary heat supply network water return heater (16), a first circulating pump (17), a heat storage tank (18), a second circulating pump (19), an electric boiler (20), a primary steam ejector power steam pipeline regulating valve (101), a primary steam ejector injection steam extraction pipeline regulating valve (102), a secondary steam ejector injection steam extraction bypass regulating valve (103), a secondary steam ejector injection steam extraction pipeline regulating valve (104), a secondary steam ejector power steam bypass regulating valve (105), a secondary steam ejector power steam pipeline regulating valve (106) and an industrial steam regulating valve (107);
the main steam outlet of the boiler (1) is connected with the inlet of a steam turbine high-pressure cylinder (2), the outlet of the steam turbine high-pressure cylinder (2) is connected with the reheating inlet of the boiler (1), the reheating outlet of the boiler (1) is sequentially connected with a steam turbine intermediate-pressure cylinder (3) and a steam turbine low-pressure cylinder (4), the outlet of the steam turbine low-pressure cylinder (4) is connected with a condenser (5), a condensate pump (6), a low-pressure heater (7), a deaerator (8), a feed pump (9) and a high-pressure heater (10) in series, and the outlet of the high-pressure heater (10) is connected with the feed water inlet of the boiler (1); the main steam outlet of the boiler (1) is also communicated with a power steam pipeline regulating valve (101) of the primary steam ejector and a power steam inlet pipeline of the primary steam ejector (11) in sequence; an injection steam inlet of the primary steam ejector (11) is communicated with a reheat steam outlet of the boiler (1) through an injection steam extraction pipeline regulating valve (102) of the primary steam ejector; the outlet of the primary steam ejector (11) is connected with an industrial steam regulating valve (107), the outlet of the primary steam ejector (11) is connected with the steam inlet of the heat storage heat exchanger (12), and the outlet of the primary steam ejector is connected with the power steam inlet of the secondary steam ejector (13) through a power steam bypass regulating valve (105) of the secondary steam ejector; a steam outlet of the heat storage heat exchanger (12) is connected with a power steam inlet of a secondary steam ejector (13) through a power steam pipeline adjusting valve (106) of the secondary steam ejector; an inlet of the secondary steam ejector (13) for ejecting steam is connected with an outlet of the steam turbine low pressure cylinder (4) through an ejection steam extraction pipeline regulating valve (104) of the secondary steam ejector, and is connected with an outlet of the steam turbine medium pressure cylinder (3) through an ejection steam extraction bypass regulating valve (103) of the secondary steam ejector; the outlet of the secondary steam ejector (13) is connected with the steam inlet of the heat supply network backwater primary heater (14); a drainage outlet of the heat supply network backwater primary heater (14) is communicated with an inlet of the deaerator (8); an outlet of a heat absorption end of the heat storage tank (18) is communicated with an inlet of an electric boiler (20) through a second circulating pump (19); the outlet of the electric boiler (20) is communicated with the inlet of the heat absorption end of the heat accumulation heat exchanger (12); the outlet of the heat absorption end of the heat storage heat exchanger (12) is communicated with the inlet of the heat absorption end of the heat storage tank (18); the heat release end outlet of the heat storage tank (18) is connected with the heat release end inlet of the heat supply network backwater secondary heater (16) through a first circulating pump (17), and the heat release end outlet of the heat supply network backwater secondary heater (16) is communicated with the heat release end inlet of the heat storage tank (18); a heat supply network water return pipeline is connected with a heat absorption end inlet of a heat supply network water return primary heater (14), a heat absorption end outlet of the heat supply network water return primary heater (14) is connected with a heat absorption end inlet of a heat supply network water return secondary heater (16), and a heat absorption end outlet of the heat supply network water return secondary heater (16) is communicated with a heat supply network water supply pipeline through a heat supply network water pump (15);
the operation method comprises a heat storage tank heat absorption operation mode, a heat storage tank heat release operation mode and a heat storage tank failure operation mode, and specifically comprises the following steps:
the heat absorption operation mode of the heat storage tank is as follows: when a power plant operates in a power utilization valley, the primary steam ejector (11) and the secondary steam ejector (13) are both in working states, the heat storage tank (18) is in heat absorption operation, the heat storage tank (18) absorbs heat and releases heat simultaneously, return water of a heat supply network is heated at a low temperature by the primary return water heater (14) of the heat supply network and at a high temperature by the secondary return water heater (16) of the heat supply network, so that the requirement of water supply of the heat supply network is met, and meanwhile, outlet steam of the primary steam ejector (11) conveys industrial steam outwards; at the moment, the primary steam ejector (11) extracts main steam generated by the boiler (1) and ejects reheat steam of the boiler (1); at the moment, a power steam pipeline regulating valve (101) of the primary steam ejector is opened, a steam extraction pipeline regulating valve (102) of the primary steam ejector is opened, and meanwhile, an industrial steam regulating valve (107) is opened to convey industrial steam outwards; the power steam pipeline regulating valve (106) of the secondary steam ejector is opened, the power steam bypass regulating valve (105) of the secondary steam ejector is closed, and the connection with the outlet of the primary steam ejector (11) is cut off; the two-stage steam ejector injection steam extraction bypass regulating valve (103) is closed, the connection with the exhaust of a steam turbine intermediate pressure cylinder is cut off, the two-stage steam ejector injection steam extraction pipeline regulating valve (104) is opened, and the outlet steam of the first-stage steam ejector (11) passes through the heat storage heat exchanger (12) and then enters the two-stage steam ejector (13) to be used as power steam to inject the exhaust of the steam turbine low pressure cylinder (4); steam at the outlet of the secondary steam ejector (13) enters a heat supply network backwater primary heater (14), and drained water after heat release flows into a deaerator (8); at the moment, the low-temperature heat storage medium in the heat storage tank (18) is primarily heated in an electric boiler (20) by using redundant electric energy through a circulating pump (19), and then enters a heat storage heat exchanger (12) to absorb heat to become a high-temperature heat storage medium; the high-temperature heat storage medium of the heat storage tank (18) is heated in a heat supply network backwater secondary heater (16) through a circulating pump (17) to heat and heat the heat supply network backwater; the return water of the heat supply network is primarily heated by a primary return water heater (14) of the heat supply network, and then heated to the temperature required by heat supply by a secondary return water heater (16) of the heat supply network for heat supply;
the heat storage tank heat release operation mode is as follows: when the power plant is in power consumption peak operation, the primary steam ejector (11) is in a working state, the secondary steam ejector (13) is in a closed state, the heat storage tank (18) is in pure heat release operation, the return water of the heat supply network is directly heated at high temperature by the return water secondary heater (16) of the heat supply network to meet the requirement of water supply of the heat supply network, and meanwhile, the outlet steam of the primary steam ejector (11) externally conveys industrial steam; at the moment, a power steam pipeline regulating valve (101) of the primary steam ejector is opened, a steam extraction pipeline regulating valve (102) of the primary steam ejector is opened, and meanwhile, an industrial steam regulating valve (107) is opened to convey industrial steam outwards; the power steam pipeline regulating valve (106) of the secondary steam ejector is closed, the power steam bypass regulating valve (105) of the secondary steam ejector is closed, the injection steam extraction bypass regulating valve (103) of the secondary steam ejector is closed, the injection steam extraction bypass regulating valve (104) of the secondary steam ejector is closed, and the primary steam ejector (11) and the secondary steam ejector (13) are both in a closed state; at this time, the endothermic process in the heat storage tank (18) is stopped; the high-temperature heat storage medium of the heat storage tank (18) is subjected to heat release in a heat supply network backwater secondary heater (16) through a circulating pump (17) to heat the heat supply network backwater; the return water of the heat supply network is directly heated to the temperature required by heat supply in a return water secondary heater (16) of the heat supply network, and the heat is output for heat supply;
failure operation mode of the heat storage tank: when the heat supply capacity of the heat storage tank (18) is insufficient, the first-stage steam ejector (11) and the second-stage steam ejector (13) are both in an opening state at the moment, the heat storage tank (18) is in a closing state, the return water of a heat supply network is directly heated to the requirement of heat supply and output through the primary return water heater (14) of the heat supply network, and meanwhile, the steam at the outlet of the first-stage steam ejector (11) is used for conveying industrial steam outwards; at the moment, a power steam pipeline regulating valve (101) of the primary steam ejector is opened, a steam extraction pipeline regulating valve (102) of the primary steam ejector is opened, and meanwhile, an industrial steam regulating valve (107) is opened to convey industrial steam outwards; the method comprises the following steps that a secondary steam ejector power steam pipeline regulating valve (106) is closed, a secondary steam ejector power steam bypass regulating valve (105) is opened, a secondary steam ejector injection steam extraction bypass regulating valve (103) is opened, a secondary steam ejector injection steam extraction bypass regulating valve (104) is closed, outlet steam of a primary steam ejector (11) is used as power steam of a secondary steam ejector (13) and used for injecting a steam turbine intermediate pressure cylinder to exhaust, and the outlet steam of the secondary steam ejector (13) enters a heat net backwater primary heater (14) to heat net backwater; at the moment, the heat absorption and release processes in the heat storage tank (18) are stopped; the return water of the heat supply network is directly heated to the temperature required by heat supply in the primary return water heater (14) of the heat supply network, and the heat is output for heat supply.
2. The method of operating a decoupled thermoelectric system with two stage steam injectors of claim 1, wherein: the power steam of the primary steam ejector (11) comes from the main steam, and the injection steam comes from the reheat steam, so the outlet temperature of the primary steam ejector (11) is 500-550 ℃.
3. The method of operating a decoupled thermoelectric system with two stage steam injectors of claim 1, wherein: the power steam of the primary steam ejector (11) comes from the main steam, and the adjustable range of the outlet steam pressure of the primary steam ejector (11) is 1-4MPa, so that the adjustable range of the industrial steam is larger.
4. The method of operating a decoupled thermoelectric system with two stage steam injectors of claim 1, wherein: the temperature difference stored in the heat storage tank (18) is 100-550 ℃.
5. The method of operating a decoupled thermoelectric system with two stage steam injectors of claim 1, wherein: the power steam source of the secondary steam ejector (13) is adjustable, the power steam is switched through the power steam pipeline adjusting valve (106) of the secondary steam ejector and the power steam bypass adjusting valve (105) of the secondary steam ejector, and according to the requirement of heat supply load, flexible switching is achieved to meet the heating requirement of a heat user.
6. The method of operating a decoupled thermoelectric system with two stage steam injectors of claim 1, wherein: the injection steam source of the secondary steam ejector (13) is adjustable, the injection steam is injected through the secondary steam ejector to inject the steam extraction pipeline regulating valve (104) and the secondary steam ejector to inject the steam extraction bypass regulating valve (103) to switch, the low-grade steam source is utilized by switching according to different loads of a power plant while heat supply is met, and the purpose of energy conservation is achieved by utilizing the steam of different grades.
7. The method of operating a decoupled thermoelectric system with two stage steam injectors of claim 1, wherein: the injection steam of the secondary steam ejector (13) comes from the exhaust of the steam turbine, and the energy utilization efficiency is high by utilizing the waste heat of the exhaust.
8. The method of operating a decoupled thermoelectric system with two stage steam injectors of claim 1, wherein: the electric boiler (20) utilizes the surplus electric energy to primarily heat the heat storage medium, so that the utilization efficiency of energy is improved.
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