CN109855147B - Combined cycle device based on heat supply and power peak regulation coupling and operation method thereof - Google Patents
Combined cycle device based on heat supply and power peak regulation coupling and operation method thereof Download PDFInfo
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- CN109855147B CN109855147B CN201910108096.6A CN201910108096A CN109855147B CN 109855147 B CN109855147 B CN 109855147B CN 201910108096 A CN201910108096 A CN 201910108096A CN 109855147 B CN109855147 B CN 109855147B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a combined cycle device based on heat supply and power peak shaving coupling and an operation method thereof, belonging to the technical field of cogeneration. The invention comprises a gas turbine unit and a steam turbine unit; based on the energy cascade utilization principle, the integrated design of different steam extraction modes is carried out, so that the operation capacity of the thermal-electrolytic coupling of the combined cycle unit is effectively improved, and the heating requirements of residents are ensured; the system is also coupled with a steam heat storage system, so that the cooperative matching of the power peak regulation and heat supply of the combined cycle unit is realized, and the power peak regulation capacity of the combined cycle unit in the operation of the pure condensation working condition is increased; after the invention is applied, the power capacity loss in the heat supply process is effectively reduced while the external heat supply capacity of the combined cycle unit is deeply excavated, in addition, the current severe power peak regulation policy requirement is met, the deep peak regulation capacity of the thermal power unit is realized, the peak regulation requirement of a power grid on the unit is practically met, and the invention has higher practical application value.
Description
Technical Field
The invention belongs to the technical field of cogeneration, and particularly relates to a combined cycle device based on heat supply and power peak shaving coupling and an operation method thereof.
Background
At present, the policy in China gradually pays attention to popularization of new energy sources, reduces the proportion of the thermal power generating unit, and makes the development of the thermal power generating unit face serious tests. Currently, in order to improve the comprehensive energy utilization efficiency of the thermal power generating unit and strive for more power generation utilization hours, the heat supply capacity of the thermal power generating unit is deeply excavated, and the thermal power generating unit is more and more valued in various communities. The gas heat and power cogeneration is an energy utilization mode for simultaneously producing heat energy and electric energy, and uses high-grade heat energy for power generation and low-grade heat energy for heat supply, thereby improving the utilization efficiency of energy, reducing environmental pollution and having great application value in the aspects of energy conservation, consumption reduction and pollution emission reduction.
At present, the gas-heat-electricity cogeneration central heating system mainly has the problems that the heat-electricity ratio is low, the heat-electricity ratio generated by the conventional gas-heat-electricity cogeneration combination is limited to a certain extent, the more advanced the unit with high conversion efficiency is, the smaller the heat-electricity ratio is, taking a 10 ten thousand kW unit as an example, and the heat-electricity ratio is about 0.7. Especially, under the severe situation of current thermal power depth peak regulation, the unit is often operated under a low-load working condition, and the external heat supply capacity of the unit is lower at the moment, so that the heat supply safety is seriously influenced. However, in the prior art, for example, a combined cycle cogeneration system (patent No. 201310401252.0) is to utilize high-emission steam extraction to reduce temperature and pressure and then supply heat to the outside, and the technical defect is that: (1) The cascade utilization of energy is not considered, and the loss of the working capacity of direct temperature and pressure reduction is larger; (2) The thermal power depth peak regulation needs are not considered, so that the unit needs to operate at high load to meet the external heat supply, and the peak regulation capability of the unit is poor.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a combined cycle device based on heat supply and power peak regulation coupling and having reasonable design and reliable performance and an operation method thereof.
The invention solves the problems by adopting the following technical scheme: a combined cycle plant based on heating and power peak shaving coupling, comprising: a gas turbine unit and a steam turbine unit;
the gas turbine unit comprises a gas turbine compressor, a gas turbine combustion chamber, a gas turbine and a first generator, wherein an exhaust port of the gas turbine compressor is connected with an air inlet of the gas turbine combustion chamber, an exhaust port of the gas turbine combustion chamber is connected with an air inlet of the gas turbine, an exhaust port of the gas turbine is connected with a flue gas inlet of the waste heat boiler through a flue gas discharge pipe, the gas turbine drives the first generator to generate power, and the gas turbine is coaxially connected with the gas turbine compressor;
the steam turbine unit comprises a waste heat boiler, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder, a second generator, a condenser, a condensate pump, a shaft seal heater, a deaerator, a first temperature-reduction pressure-reduction device, a second temperature-reduction pressure-reduction device, a third temperature-reduction pressure-reduction device, a fourth temperature-reduction pressure-reduction device, a steam heat accumulator, working equipment, power equipment, a heat supply network heater, a hydrophobic heat exchanger and a heat supply network circulating pump, the steam turbine high-pressure cylinder, the steam turbine medium-pressure cylinder and the steam turbine low-pressure cylinder are coaxially connected and drive the second generator to generate electricity, the waste heat boiler comprises a flue gas preheater, a low-pressure steam drum, a low-pressure superheater, a high-pressure steam drum, a reheater and a high-pressure superheater, a water outlet of the flue gas preheater is simultaneously connected with a water inlet of the low-pressure steam drum and a water inlet of the high-pressure steam drum, a steam outlet of the low-pressure steam drum is connected with a steam inlet of the low-pressure superheater, the steam outlet of the high-pressure steam drum is connected with the steam inlet of the high-pressure superheater, the steam inlet of the high-pressure cylinder of the steam turbine is connected with the steam outlet of the high-pressure superheater through a high-pressure steam pipe, a valve I is arranged at the steam inlet of the high-pressure cylinder of the steam turbine, the steam outlet of the high-pressure cylinder of the steam turbine is connected with the steam inlet of the reheater through a cold steam pipe, a valve IV is arranged at the steam inlet of the reheater, the steam outlet of the reheater is connected with the steam inlet of the medium-pressure cylinder of the steam turbine through a hot steam pipe, a valve VI is arranged at the steam inlet of the medium-pressure cylinder of the steam turbine, the steam outlet of the medium-pressure cylinder of the steam turbine is connected with the steam inlet of the low-pressure cylinder of the steam turbine through a communicating pipe, a hydraulic valve is arranged at the steam inlet of the low-pressure cylinder of the steam turbine, the communicating pipe is connected with one end of the low-pressure steam pipe, a valve nine is arranged at one end of the low-pressure steam pipe, the steam outlet of the low-pressure superheater is connected with the other end of the low-pressure steam pipe, a valve with the number ten is arranged at the other end of the low-pressure steam pipe, the steam outlet of the low-pressure cylinder of the steam turbine is connected with the condenser, the water inlet end of the boiler water supply pipe is connected with the condenser, the water outlet end of the boiler water supply pipe is connected with the water inlet of the flue gas preheater, a condensate pump, a shaft seal heater and a deaerator are sequentially arranged on the boiler water supply pipe along the water flow direction, the steam inlet end of the high-pressure steam bypass is connected with the high-pressure steam pipe, the steam outlet end of the high-pressure steam bypass is connected with the steam inlet end of the first medium-pressure steam branch pipe, a valve with the number two, a first temperature and pressure reducing device and a valve with the number three are sequentially arranged on the high-pressure steam bypass along the steam flow direction, the steam outlet end of the first medium-pressure steam branch pipe is connected with the steam inlet of the third temperature and pressure reducing device, the cold re-steam bypass has steam inlet connected to the cold re-steam pipe, cold re-steam bypass with steam outlet connected to the first medium pressure steam pipe, cold re-steam bypass with valve No. five, hot re-steam bypass with steam inlet connected to the hot re-steam pipe, hot re-steam bypass with steam outlet connected to the steam inlet of the first medium pressure steam pipe, seventh valve, second temperature and pressure reducer and eighth valve successively installed on the hot re-steam bypass along the steam flow direction, low pressure steam bypass with steam inlet connected to the low pressure steam pipe, low pressure steam bypass with steam outlet connected to the steam inlet of the heating steam pipe, eleven valve installed on the low pressure steam bypass, and heating steam pipe with steam outlet connected to the steam inlet of the heating network heater, and a twenty-number valve is arranged on the heating steam extraction pipe, the steam outlet of the third temperature and pressure reducing device is connected with the steam inlet of the heating steam extraction pipe, a seventeen-number valve and an eighteen-number valve are respectively arranged at the steam inlet and the steam outlet of the third temperature and pressure reducing device, the steam inlet of the second medium-pressure steam branch pipe is connected with the steam inlet of the first medium-pressure steam branch pipe, a fourteen-number valve and a fourth temperature and pressure reducing device are sequentially arranged on the second medium-pressure steam branch pipe along the steam flow direction, the steam outlet of the second medium-pressure steam branch pipe is connected with the steam inlet of the working device, the steam outlet of the working device is connected with the steam inlet of the heating steam extraction pipe, a seventeen-number valve and an eighteen-number valve are respectively arranged at the steam inlet and the steam outlet of the working device, the water drain outlet of the heat network heater is connected with the high-temperature water drain inlet of the water drain heat exchanger, the low-drain outlet of the water drain heat exchanger is connected with the water inlet of the condensate pump through the water drain pipe, a twenty-one-number valve is arranged on the water drain pipe, the water drain pipe is connected with the low-temperature water return pipe of the heat exchanger, the water return pipe is connected with the water drain pipe, the water return pipe is connected with the water return pipe, the water return pipe is connected with the water heater, and the water heater is connected with the water heater.
Further, the steam outlet end of the second medium-pressure steam branch pipe is also connected with the steam inlet of the steam heat accumulator, the steam outlet of the steam heat accumulator is connected with the steam inlet end of the heating steam extraction pipe, and a fifteen valve and a sixteen valve are respectively arranged at the steam inlet and the steam outlet of the steam heat accumulator.
Furthermore, the deaerator is connected with the steam outlet end of the low-pressure steam bypass, the steam outlet of the third temperature and pressure reduction device, the steam outlet of the steam heat accumulator and the steam outlet of the acting device simultaneously through a deaeration steam extraction pipe, and a nineteenth valve is arranged on the deaeration steam extraction pipe.
Furthermore, the acting device drives the power device to act, the acting device is a back press or a screw expander, and the power device is a generator, a heat supply network circulating pump or a condensate pump and the like.
Furthermore, the third temperature and pressure reducing device, the steam heat accumulator and the acting device are all connected in parallel, and simultaneously provide needed steam for the deaerator and the heat supply network heater.
Further, the steam inlet end of the second medium-pressure steam branch pipe is connected with the steam outlet end of the high-pressure steam bypass, the steam outlet end of the cold re-steam bypass and the steam outlet end of the hot re-steam bypass.
The operation method of the combined cycle device based on heat supply and power peak shaving coupling is as follows:
when the unit is in a pure condensation working condition and no power peak regulation requirement exists:
only a valve I, a valve IV, a valve VI, a hydraulic butterfly valve, a valve nine, a valve ten, a valve eleven and a valve nineteenth are opened, the combined cycle unit does not supply heat to the outside, and the deoxidized steam of the deoxidizer is from the low-pressure steam supplementing of the low-pressure superheater;
when the unit is in a pure condensation working condition and has power peak regulation requirements:
A. when the unit needs to reduce the electric load to the external output, mainly carry out steam heat accumulation through the steam heat accumulator, reduce the steam flow who gets into the steam turbine and do work, this moment:
opening a valve No. five and a valve No. fourteen, and directly enabling exhaust steam from a high-pressure cylinder of the steam turbine to enter a fourth temperature and pressure reduction device, and conveying the exhaust steam to a steam heat accumulator for heat accumulation by opening the valve No. fifteen after temperature and pressure reduction;
or opening a fourteen valve, a seventh valve and an eighth valve, wherein the hot re-steam from the reheater firstly passes through a second temperature and pressure reducing device to perform primary temperature and pressure reduction, then passes through a fourth temperature and pressure reducing device to perform secondary temperature and pressure reduction, and finally is conveyed to a steam heat accumulator to perform heat accumulation by opening a fifteen valve;
Or opening a fourteen valve, a second valve and a third valve, wherein the main steam from the high-pressure superheater firstly passes through a first temperature and pressure reducing device to be subjected to primary temperature and pressure reduction, then passes through a fourth temperature and pressure reducing device to be subjected to temperature and pressure reduction, and finally is conveyed to a steam heat accumulator to be subjected to heat accumulation by opening the fifteen valve;
B. when the unit needs to increase the external output electric load, the heat release of steam is mainly carried out through the steam heat accumulator, the steam flow entering the steam turbine for doing work is increased, and at the moment:
closing a fifteenth valve, opening a sixteen valve, and externally carrying out steam heat release by the steam heat accumulator; at the moment, an eleventh valve is closed, a nineteenth valve is opened, and the steam heat accumulator provides deoxidized steam for the deoxidizer;
or simultaneously opening an eleventh valve and a nineteenth valve, wherein the steam heat accumulator not only provides deoxidized steam for the deoxidizer, but also provides low-pressure steam supplementing for the low-pressure cylinder of the steam turbine, so that the steam flow entering the low-pressure cylinder of the steam turbine to do work is increased;
when the unit is in a heating working condition and no power peak regulation is required:
the twenty-first valve, the twenty-second valve and the twenty-third valve are opened, heating steam is utilized to drain water through a drainage heat exchanger to perform primary heating on the heat supply network backwater from the heat supply network backwater pipe, heating steam is utilized to perform secondary heating on the heat supply network backwater from the drainage heat exchanger through a heat supply network heater, and then heat is supplied to the outside through the output of the heat supply network water supply pipe;
At this time, a specific operation method for providing heating steam for the heat supply network heater is as follows:
opening an eleventh valve, and using low-pressure steam supplementing from a low-pressure superheater or steam exhaust of a middle pressure cylinder of a steam turbine as heating steam required by a heating network heater;
or opening a twelve valve and a fourteen valve (64), enabling the medium-pressure steam to enter a third temperature and pressure reduction device to be subjected to temperature and pressure reduction to form low-pressure steam, and then conveying the low-pressure steam to a heating network heater through a heating steam extraction pipe;
or opening a fourteen valve, a seventeen valve and an eighteen valve, enabling medium-pressure steam to enter a fourth temperature and pressure reduction device for primary temperature and pressure reduction, then entering working equipment to drive power equipment to do work to form low-pressure steam, and then conveying the low-pressure steam to a heating network heater through a heating steam extraction pipe;
when the unit is in a heating working condition and has power peak regulation requirements:
A. when the unit needs to reduce the load of the external output electricity, the steam heat storage is mainly carried out through the steam heat accumulator, the steam flow entering the steam turbine for doing work is reduced, and the specific operation is as follows:
the fifteen valve is opened, the sixteen valve is closed, and the steam after temperature and pressure reduction through the fourth temperature and pressure reduction device is further conveyed to the steam heat accumulator for heat storage, so that the steam flow entering the fourth temperature and pressure reduction device is increased, and the steam flow entering the steam turbine for work is reduced;
B. When the unit needs to increase the external output electric load, the steam heat release is mainly carried out through the steam heat accumulator, the steam flow entering the steam turbine for doing work is increased, and the specific operation is as follows:
closing a fifteenth valve, opening a sixteen valve, and externally carrying out steam heat release by the steam heat accumulator; at this time, eleven valves, twelve valves, thirteenth valves, fourteen valves, seventeen valves and eighteen valves are also closed, and the heating steam source required by the heating network heater is only a steam heat accumulator.
The operation method of the combined cycle device based on heat supply and power peak shaving coupling comprises the following steps:
the specific operation method for providing medium-pressure steam for the third temperature and pressure reduction device and the fourth temperature and pressure reduction device is as follows:
opening a valve No. five, and directly using exhaust steam from a high-pressure cylinder of the steam turbine as a medium-pressure steam source of the third temperature and pressure reduction device and the fourth temperature and pressure reduction device;
or opening a valve No. seven and a valve No. eight, and forming steam with lower pressure and temperature after the hot re-steam from the reheater passes through the second temperature and pressure reducing device, wherein the steam is used as a medium-pressure steam source of the third temperature and pressure reducing device and the fourth temperature and pressure reducing device;
or opening the second valve and the third valve, and forming steam with lower pressure and temperature after the main steam from the high-pressure superheater passes through the first temperature and pressure reducing device, wherein the steam is used as a medium-pressure steam source of the third temperature and pressure reducing device and the fourth temperature and pressure reducing device.
The operation method of the combined cycle device based on heat supply and power peak shaving coupling comprises the following steps:
when the unit provides heating steam for the heat supply network heater, the low-pressure steam supplementing of the low-pressure superheater or the steam exhaust of the medium-pressure cylinder of the steam turbine is preferentially selected, the steam exhaust of the acting equipment is selected, and the temperature and pressure reduction steam of the third temperature and pressure reduction device is selected;
when the unit provides medium-pressure steam for the third temperature and pressure reduction device and the fourth temperature and pressure reduction device, the high-pressure exhaust steam of the high-pressure cylinder of the steam turbine is preferentially selected and utilized, the hot re-steam of the reheater is selected and utilized, and the main steam of the high-pressure superheater is selected and utilized.
Compared with the prior art, the invention has the following advantages and effects: the integrated design of different steam extraction modes is carried out based on the energy cascade utilization principle, so that the operation capacity of the thermal-electrolytic coupler of the combined cycle unit is effectively improved, and the heating requirements of residents are ensured; the system is also coupled with a steam heat storage system, so that the cooperative matching of the power peak regulation and heat supply of the combined cycle unit is realized, and the power peak regulation capacity of the combined cycle unit in the operation of the pure condensation working condition is increased; after the invention is applied, the power capacity loss in the heat supply process is effectively reduced while the external heat supply capacity of the combined cycle unit is deeply excavated, in addition, the current severe power peak regulation policy requirement is met, the deep peak regulation capacity of the thermal power unit is realized, the peak regulation requirement of a power grid on the unit is practically met, and the invention has higher practical application value.
Drawings
FIG. 1 is a schematic diagram of a combined cycle plant based on heat supply and power peak shaving coupling in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1, the combined cycle device based on heat supply and power peak shaving coupling in the present embodiment includes: a gas turbine unit and a steam turbine unit;
the gas turbine unit comprises a gas turbine compressor 1, a gas turbine combustion chamber 2, a gas turbine 3 and a first generator 4, wherein an exhaust port of the gas turbine compressor 1 is connected with an air inlet of the gas turbine combustion chamber 2, an exhaust port of the gas turbine combustion chamber 2 is connected with an air inlet of the gas turbine 3, an exhaust port of the gas turbine 3 is connected with a flue gas inlet of a waste heat boiler 5 through a flue gas discharge pipe 31, the gas turbine 3 drives the first generator 4 to generate power, and the gas turbine 3 is coaxially connected with the gas turbine compressor 1;
the steam turbine unit comprises a waste heat boiler 5, a steam turbine high pressure cylinder 6, a steam turbine medium pressure cylinder 7, a steam turbine low pressure cylinder 8, a second generator 9, a condenser 10, a condensate pump 11, a shaft seal heater 12, a deaerator 13, a first temperature and pressure reduction device 14, a second temperature and pressure reduction device 15, a third temperature and pressure reduction device 16, a fourth temperature and pressure reduction device 17, a steam heat accumulator 18, a working device 19, a power device 20, a heat supply network heater 21, a drainage heat exchanger 22 and a heat supply network circulating pump 23, the steam turbine high pressure cylinder 6, the steam turbine medium pressure cylinder 7 and the steam turbine low pressure cylinder 8 are coaxially connected and drive the second generator 9 to generate electricity, the waste heat boiler 5 comprises a flue gas preheater 501, a low pressure steam drum 502, a low pressure superheater 503, a high pressure steam drum 504, a reheater 505 and a high pressure superheater 506, a water outlet of the flue gas preheater 501 is simultaneously connected with a water inlet of the low pressure steam drum 502 and a water inlet of the high pressure steam drum 504, the outlet of the low pressure steam drum 502 is connected with the inlet of the low pressure superheater 503, the outlet of the high pressure steam drum 504 is connected with the inlet of the high pressure superheater 506, the inlet of the turbine high pressure cylinder 6 is connected with the outlet of the high pressure superheater 506 through the high pressure steam pipe 33, the inlet of the turbine high pressure cylinder 6 is provided with a valve number one 51, the outlet of the turbine high pressure cylinder 6 is connected with the inlet of the reheater 505 through the cold re-steam pipe 34, the inlet of the reheater 505 is provided with a valve number four 54, the outlet of the reheater 505 is connected with the inlet of the turbine medium pressure cylinder 7 through the hot re-steam pipe 35, the inlet of the turbine medium pressure cylinder 7 is provided with a valve number six 56, the outlet of the turbine medium pressure cylinder 7 is connected with the inlet of the turbine low pressure cylinder 8 through the communication pipe 36, the inlet of the turbine low pressure cylinder 8 is provided with a hydraulic butterfly valve 59, the communicating pipe 36 is connected with one end of the low pressure steam pipe 37, a valve 60 with nine numbers is arranged at one end of the low pressure steam pipe 37, a steam outlet of the low pressure superheater 503 is connected with the other end of the low pressure steam pipe 37, a valve 61 with ten numbers is arranged at the other end of the low pressure steam pipe 37, a steam outlet of the low pressure cylinder 8 of the steam turbine is connected with the condenser 10, a water inlet end of the boiler water supply pipe 32 is connected with the condenser 10, a water outlet end of the boiler water supply pipe 32 is connected with a water inlet of the flue gas preheater 501, a condensate pump 11, a shaft seal heater 12 and a deaerator 13 are sequentially arranged on the boiler water supply pipe 32 along the water flow direction, a steam inlet end of the high pressure steam bypass 38 is connected with the high pressure steam pipe 33, a steam outlet end of the high pressure steam bypass 38 is connected with a steam inlet end of the first medium pressure steam branch pipe 42, a valve 52 with a second number two, a first temperature and pressure reducing device 14 and a valve 53 are sequentially arranged on the high pressure steam bypass 38 along the steam flow direction, the steam outlet end of the first medium pressure steam branch pipe 42 is connected with the steam inlet of the third temperature and pressure reduction device 16, a twelve valve 63 is arranged on the first medium pressure steam branch pipe 42, the steam inlet end of the cold re-steam bypass 39 is connected with the cold re-steam pipe 34, the steam outlet end of the cold re-steam bypass 39 is connected with the steam inlet end of the first medium pressure steam branch pipe 42, a five valve 55 is arranged on the cold re-steam bypass 39, the steam inlet end of the hot re-steam bypass 40 is connected with the hot re-steam pipe 35, the steam outlet end of the hot re-steam bypass 40 is connected with the steam inlet end of the first medium pressure steam branch pipe 42, a seven valve 57, a second temperature and pressure reduction device 15 and a eight valve 58 are arranged on the hot re-steam bypass 40 in sequence along the steam flow direction, the steam inlet end of the low pressure steam bypass 41 is connected with the low pressure steam pipe 37, the steam outlet end of the low-pressure steam bypass 41 is connected with the steam inlet end of the heating steam extraction pipe 45, an eleven valve 62 is arranged on the low-pressure steam bypass 41, the steam outlet end of the heating steam extraction pipe 45 is connected with the steam inlet of the heat supply network heater 21, an twenty-number valve 71 is arranged on the heating steam extraction pipe 45, the steam outlet of the third temperature and pressure reduction device 16 is connected with the steam inlet end of the heating steam extraction pipe 45, a thirteen valve 64 is arranged at the steam outlet of the third temperature and pressure reduction device 16, the steam inlet end of the second medium-pressure steam branch pipe 43 is connected with the steam inlet end of the first medium-pressure steam branch pipe 42, a fourteen valve 65 and a fourth temperature and pressure reduction device 17 are sequentially arranged on the second medium-pressure steam branch pipe 43 along the steam flow direction, the steam outlet end of the second medium-pressure steam branch pipe 43 is connected with the steam inlet of the acting equipment 19, the steam outlet of the working device 19 is connected with the steam inlet end of the heating steam extraction pipe 45, a seventeen valve 68 and an eighteen valve 69 are respectively arranged at the steam inlet and the steam outlet of the working device 19, the water drain outlet of the heat supply network heater 21 is connected with the high-temperature water drain inlet of the water drain heat exchanger 22, the low-temperature water drain outlet of the water drain heat exchanger 22 is connected with the water inlet of the condensate pump 11 through the water drain pipe 46, a twenty-one valve 72 is arranged on the water drain pipe 46, the heat supply network water return pipe 47 is connected with the low-temperature water side inlet of the water drain heat exchanger 22, a twenty-two valve 73 and the heat supply network circulating pump 23 are arranged on the heat supply network water return pipe 47, the low-temperature side outlet of the water drain heat exchanger 22 is connected with the water side inlet of the heat supply network heater 21, the water side outlet of the heat supply network heater 21 is connected with the heat supply network water supply pipe 48, and a twenty-three valve 74 is arranged on the heat supply network water supply network pipe 48.
The steam outlet end of the second medium-pressure steam branch pipe 43 is also connected with the steam inlet of the steam heat accumulator 18, the steam outlet of the steam heat accumulator 18 is connected with the steam inlet end of the heating steam extraction pipe 45, and a fifteen valve 66 and a sixteen valve 67 are respectively arranged at the steam inlet and the steam outlet of the steam heat accumulator 18.
The deaerator 13 is simultaneously connected with the steam outlet end of the low-pressure steam bypass 41, the steam outlet of the third temperature and pressure reduction device 16, the steam outlet of the steam heat accumulator 18 and the steam outlet of the acting device 19 through a deaeration steam extraction pipe 44, and a nineteenth valve 70 is arranged on the deaeration steam extraction pipe 44.
The acting device 19 drives the power device 20 to do work, the acting device 19 is a back press or a screw expander, and the power device 20 is a generator, a heat supply network circulating pump or a condensate pump.
The third temperature and pressure reducing device 16, the steam heat accumulator 18 and the working device 19 are all connected in parallel, and simultaneously provide the deaerator 13 and the heat supply network heater 21 with the required steam.
The steam inlet end of the second intermediate-pressure steam branch pipe 43 is also connected with the steam outlet end of the high-pressure steam bypass 38, the steam outlet end of the cold re-steam bypass 39 and the steam outlet end of the hot re-steam bypass 40.
The specific operation method of the embodiment is as follows:
when the unit is in a pure condensation working condition and no power peak regulation requirement exists:
Only opening the valve No. 51, the valve No. 54, the valve No. 56, the hydraulic butterfly valve 59, the valve No. 60, the valve No. 61, the valve No. eleven 62 and the valve No. nineteenth 70, wherein the combined cycle unit does not supply heat to the outside, and the deoxidized steam of the deoxidizer 13 is from the low-pressure steam supplementing of the low-pressure superheater 503;
when the unit is in a pure condensation working condition and has power peak regulation requirements:
A. when the unit needs to reduce the load of the output electricity, the steam heat storage is mainly carried out through the steam heat accumulator 18, so that the steam flow entering the steam turbine to do work is reduced, and at the moment:
the valve 55 and the valve 65 are opened, the exhaust steam from the high-pressure cylinder 6 of the steam turbine directly enters the fourth temperature and pressure reduction device 17, and after temperature and pressure reduction, the exhaust steam is conveyed to the steam heat accumulator 18 for heat accumulation by opening the valve 66;
or, opening the fourteen valve 65, the seventh valve 57 and the eighth valve 58, wherein the hot re-steam from the reheater 505 firstly passes through the second temperature and pressure reducing device 15 to perform primary temperature and pressure reduction, then passes through the fourth temperature and pressure reducing device 17 to perform secondary temperature and pressure reduction, and finally is conveyed to the steam heat accumulator 18 to perform heat accumulation by opening the fifteen valve 66;
or, opening the fourteen valve 65, the second valve 52 and the third valve 53, wherein the main steam from the high-pressure superheater 506 firstly passes through the first temperature and pressure reduction device 14 to be subjected to primary temperature and pressure reduction, then passes through the fourth temperature and pressure reduction device 17 to be subjected to temperature and pressure reduction, and finally is conveyed to the steam heat accumulator 18 to be subjected to heat accumulation by opening the fifteen valve 66;
B. When the unit needs to increase the load of the output electricity, the heat release of the steam is mainly carried out through the steam heat accumulator 18, the steam flow entering the steam turbine for doing work is increased, and at the moment:
closing the fifteenth valve 66, opening the sixteen valve 67, and discharging the steam from the steam heat accumulator 18; at this time, the eleven valve 62 is closed, the nineteenth valve 70 is opened, and the steam accumulator 18 supplies deoxidizing steam to the deoxidizer 13;
or, the eleven valve 62 and the nineteenth valve 70 are opened simultaneously, and the steam accumulator 18 provides deoxidized steam for the deoxidizer 13 and low-pressure steam supplementing for the low-pressure cylinder 8 of the steam turbine, so that the steam flow entering the low-pressure cylinder 8 of the steam turbine for doing work is increased;
when the unit is in a heating working condition and no power peak regulation is required:
the twenty-first valve 71, the twenty-first valve 72, the twenty-second valve 73 and the twenty-third valve 74 are opened, heating steam is utilized to drain water from the heat supply network water return pipe 47 through the drainage heat exchanger 22 to perform primary heating, heating steam is utilized to perform secondary heating on the heat supply network water return from the drainage heat exchanger 22 through the heat supply network heater 21, and then the heat supply network water supply pipe 48 outputs heat to the outside;
at this time, a specific operation method for supplying heating steam to the heating grid heater 21 is as follows:
Opening an eleventh valve 62, and using low-pressure steam supplementing from the low-pressure superheater 503 or steam exhaust from the intermediate pressure cylinder 7 of the steam turbine as heating steam required by the heating grid heater 21;
or, the twelve valve 63 and the fourteen valve 65 are opened, the medium-pressure steam enters the third temperature and pressure reduction device 16 to be subjected to temperature and pressure reduction to form low-pressure steam, and then the low-pressure steam is conveyed to the heating network heater 21 through the heating steam extraction pipe 45;
or, opening a fourteen valve 65, a seventeen valve 68 and an eighteen valve 69, enabling medium-pressure steam to enter the fourth temperature and pressure reduction device 17 for primary temperature and pressure reduction, then enter the working equipment 19 to drive the power equipment 20 to do work to form low-pressure steam, and then conveying the low-pressure steam to the heating network heater 21 through the heating steam extraction pipe 45;
when the unit is in a heating working condition and has power peak regulation requirements:
A. when the unit needs to reduce the load of the external output electricity, the steam heat storage is mainly carried out through the steam heat accumulator 18, so that the steam flow entering the steam turbine for doing work is reduced, and the specific operation is as follows:
the fifteen valve 66 is opened, the sixteen valve 67 is closed, and the steam after being subjected to temperature and pressure reduction by the fourth temperature and pressure reduction device 17 is further conveyed to the steam heat accumulator 18 for heat storage, so that the steam flow entering the fourth temperature and pressure reduction device 17 is increased, and the steam flow entering the steam turbine for work is reduced;
B. When the unit needs to increase the load of the external output electricity, the heat release of the steam is mainly carried out through the steam heat accumulator 18, the steam flow entering the steam turbine for doing work is increased, and the specific operation is as follows:
closing the fifteenth valve 66, opening the sixteen valve 67, and discharging the steam from the steam heat accumulator 18; at this time, the eleven valve 62, the twelve valve 63, the thirteenth valve 64, the fourteenth valve 65, the seventeen valve 68 and the eighteen valve 69 are also closed or closed, and the heating steam source required for the heating grid heater 21 is mainly the steam heat accumulator 18 or only the steam heat accumulator 18.
In the specific operation method of the embodiment, the following steps are adopted:
the specific operation method for providing medium-pressure steam to the third and fourth temperature and pressure reducing devices 16 and 17 is as follows:
opening a valve No. 55, and directly using exhaust steam from the high-pressure cylinder 6 of the steam turbine as a medium-pressure steam source of the third temperature and pressure reduction device 16 and the fourth temperature and pressure reduction device 17;
or opening the valve 57 and the valve 58, and forming steam with lower pressure and temperature after the hot re-steam from the reheater 505 passes through the second temperature and pressure reducing device 15, wherein the steam is used as a medium-pressure steam source of the third temperature and pressure reducing device 16 and the fourth temperature and pressure reducing device 17;
Alternatively, the second valve 52 and the third valve 53 are opened, and the main steam from the high-pressure superheater 506 passes through the first temperature and pressure reduction device 14 to form steam with lower pressure and temperature, which is used as a medium-pressure steam source for the third temperature and pressure reduction device 16 and the fourth temperature and pressure reduction device 17.
In the specific operation method of the embodiment, the following steps are adopted:
when the unit provides heating steam for the heat supply network heater 21, the low-pressure steam supplementing of the low-pressure superheater 503 or the steam exhaust of the steam turbine medium pressure cylinder 7 are preferably selected and utilized, the steam exhaust of the acting equipment 19 is selected and utilized, and the temperature and pressure reduction steam of the third temperature and pressure reduction device 16 is selected and utilized;
when the unit supplies medium-pressure steam to the third temperature and pressure reduction device 16 and the fourth temperature and pressure reduction device 17, the high-pressure exhaust steam of the high-pressure cylinder 6 of the steam turbine is preferentially selected to be utilized, the hot re-steam of the reheater 505 is secondarily selected to be utilized, and the main steam of the high-pressure superheater 506 is finally selected to be utilized.
In the specific operation method of this embodiment, all valves have the function of adjusting the fluid flow of the pipeline; other valves have a cutoff function except for the hydraulic butterfly valve 59.
In the specific operation method of the embodiment, during the heat supply working condition, the opening degree adjustment of all valves is completed through the remote operation of the DCS control system of the combined cycle unit; in addition, the make-up water flow of the combined cycle unit boiler feedwater system is mainly determined by the heat storage and release steam flow of the steam heat accumulator 18.
Although the present invention is described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (6)
1. A combined cycle plant based on heating and power peak shaving coupling, comprising: a gas turbine unit and a steam turbine unit;
the gas turbine unit comprises a gas turbine compressor (1), a gas turbine combustion chamber (2), a gas turbine (3) and a first generator (4), wherein an exhaust port of the gas turbine compressor (1) is connected with an air inlet of the gas turbine combustion chamber (2), an exhaust port of the gas turbine combustion chamber (2) is connected with an air inlet of the gas turbine (3), an exhaust port of the gas turbine (3) is connected with a flue gas inlet of a waste heat boiler (5) through a flue gas discharge pipe (31), the gas turbine (3) drives the first generator (4) to generate electricity, and the gas turbine (3) is coaxially connected with the gas turbine compressor (1);
the steam turbine unit comprises a waste heat boiler (5), a steam turbine high-pressure cylinder (6), a steam turbine medium-pressure cylinder (7), a steam turbine low-pressure cylinder (8), a second generator (9), a condenser (10), a condensate pump (11), a shaft seal heater (12), a deaerator (13), a first temperature and pressure reduction device (14), a second temperature and pressure reduction device (15), a third temperature and pressure reduction device (16), a fourth temperature and pressure reduction device (17), a steam heat accumulator (18), a power device (19), a power device (20), a heat supply network heater (21), a hydrophobic heat exchanger (22) and a heat supply network circulating pump (23), the steam turbine high-pressure cylinder (6), the steam turbine medium-pressure cylinder (7) and the steam turbine low-pressure cylinder (8) are coaxially connected, and drive the second generator (9) to generate electricity, the waste heat boiler (5) comprises a flue gas preheater (501), a low-pressure steam drum (502), a low-pressure superheater (503), a high-pressure drum (504), a reheater (505) and a high-pressure superheater (506), a water outlet of the flue gas preheater (501) is simultaneously connected with a water inlet of the low-pressure drum (502) and a water inlet of the low-pressure drum (503), the steam outlet of the high-pressure steam drum (504) is connected with the steam inlet of the high-pressure superheater (506), the steam inlet of the high-pressure steam drum (6) is connected with the steam outlet of the high-pressure superheater (506) through a high-pressure steam pipe (33), a first valve (51) is arranged at the steam inlet of the high-pressure steam drum (6), the steam outlet of the high-pressure steam drum (6) is connected with the steam inlet of the reheater (505) through a cold re-steam pipe (34), a fourth valve (54) is arranged at the steam inlet of the reheater (505), the steam outlet of the reheater (505) is connected with the steam inlet of the medium-pressure steam drum (7) through a hot re-steam pipe (35), a sixth valve (56) is arranged at the steam inlet of the medium-pressure steam drum (7), the steam outlet of the medium-pressure steam drum (7) is connected with the steam inlet of the low-pressure steam drum (8) through a first valve (36), the valve (37) is arranged at the other end of the low-pressure pipe (37), the valve (37) is connected with the other end of the low-pressure pipe (37), the steam turbine low pressure cylinder (8) is connected with the condenser (10) through a steam outlet, a water inlet end of a boiler water supply pipe (32) is connected with the condenser (10), a water outlet end of the boiler water supply pipe (32) is connected with a water inlet of a flue gas preheater (501), a condensate pump (11), a shaft seal heater (12) and a deaerator (13) are sequentially arranged on the boiler water supply pipe (32) along the water flow direction, a steam inlet end of a high pressure steam bypass (38) is connected with the high pressure steam pipe (33), a steam outlet end of the high pressure steam bypass (38) is connected with a steam inlet end of a first medium pressure steam branch pipe (42), a second valve (52), a first temperature and pressure reducing device (14) and a third valve (53) are sequentially arranged on the high pressure steam bypass (38), a twelve valve (42) is arranged on the first medium pressure steam branch pipe (42), a second valve (39) is connected with a steam inlet end of a third cold branch pipe (16), a fifth valve (39) is arranged on the first medium pressure steam bypass (42) and a second cold steam bypass (39) is connected with the hot steam inlet end of the first bypass (35), the steam outlet end of the hot re-steam bypass (40) is connected with the steam inlet end of the first medium-pressure steam branch pipe (42), a seventh valve (57), a second temperature and pressure reducing device (15) and a eighth valve (58) are sequentially arranged on the hot re-steam bypass (40) along the steam flowing direction, the steam inlet end of the low-pressure steam bypass (41) is connected with the low-pressure steam pipe (37), the steam outlet end of the low-pressure steam bypass (41) is connected with the steam inlet end of the heating steam extraction pipe (45), an eleventh valve (62) is arranged on the low-pressure steam bypass (41), the steam outlet end of the heating steam extraction pipe (45) is connected with the steam inlet of the heating steam extraction pipe (45), a twenty-first valve (71) is arranged on the heating steam extraction pipe (45), the steam outlet of the third temperature reducing device (16) is connected with the steam inlet end of the heating branch pipe (45), a thirteenth valve (64) is arranged at the steam outlet of the third temperature reducing device (16), the steam inlet end of the second branch pipe (45) is connected with the steam inlet end of the second medium-pressure reducing device (43) along the steam flowing direction, the steam inlet end of the second medium-pressure reducing device (43) is connected with the steam inlet end of the second medium-pressure steam pipe (43) in turn, the steam outlet of the working equipment (19) is connected with the steam inlet end of a heating steam extraction pipe (45), a seventeen valve (68) and an eighteen valve (69) are respectively arranged at the steam inlet and the steam outlet of the working equipment (19), the water drain outlet of the heat supply network heater (21) is connected with the high-temperature water drain inlet of the water drain heat exchanger (22), the low-temperature water drain outlet of the water drain heat exchanger (22) is connected with the water inlet of the condensate pump (11) through a water drain pipe (46), a twenty-one valve (72) is arranged on the water drain pipe (46), the heat supply network water return pipe (47) is connected with the low-temperature water side inlet of the water drain heat exchanger (22), a twenty-two valve (73) and the heat supply network circulating pump (23) are arranged on the heat supply network water return pipe (47), the water side outlet of the water drain heat exchanger (22) is connected with the water side inlet of the heat supply network heater (21), and a twenty-three valve (74) is arranged on the heat supply network water supply pipe (48);
The steam inlet end of the second medium-pressure steam branch pipe (43) is connected with the steam outlet end of the high-pressure steam bypass (38), the steam outlet end of the cold re-steam bypass (39) and the steam outlet end of the hot re-steam bypass (40) at the same time;
the steam outlet end of the second medium-pressure steam branch pipe (43) is also connected with the steam inlet of the steam heat accumulator (18), the steam outlet of the steam heat accumulator (18) is connected with the steam inlet end of the heating steam extraction pipe (45), and a fifteen valve (66) and a sixteen valve (67) are respectively arranged at the steam inlet and the steam outlet of the steam heat accumulator (18);
the third temperature and pressure reducing device (16), the steam heat accumulator (18) and the acting equipment (19) are all connected in parallel, and simultaneously provide needed steam for the deaerator (13) and the heat supply network heater (21).
2. The combined cycle device based on heat supply and power peak shaving coupling according to claim 1, wherein the deaerator (13) is connected with the steam outlet end of the low-pressure steam bypass (41), the steam outlet of the third temperature and pressure reduction device (16), the steam outlet of the steam heat accumulator (18) and the steam outlet of the working equipment (19) simultaneously through a deaeration steam extraction pipe (44), and a nineteenth valve (70) is installed on the deaeration steam extraction pipe (44).
3. The combined cycle device based on heat supply and power peak shaving coupling according to claim 1, wherein the acting device (19) drives the power device (20) to do work, the acting device (19) is a back press or a screw expander, and the power device (20) is a generator, a heat supply network circulating pump or a condensate pump.
4. A method of operating a combined cycle plant based on heat supply and power peak shaving coupling according to any one of claims 1 to 3, characterized in that the method of operation is as follows:
when the unit is in a pure condensation working condition and no power peak regulation requirement exists:
only a first valve (51), a fourth valve (54), a sixth valve (56), a hydraulic butterfly valve (59), a ninth valve (60), a tenth valve (61), an eleventh valve (62) and a nineteenth valve (70) are opened, the combined cycle unit does not supply heat to the outside, and the deoxidized steam of the deoxidizer (13) is from the low-pressure steam supplementing of the low-pressure superheater (503);
when the unit is in a pure condensation working condition and has power peak regulation requirements:
A. when the unit needs to reduce the electric load to the external output, mainly carry out steam heat accumulation through steam accumulator (18), reduce the steam flow who gets into the steam turbine and do work, this moment:
Opening a valve No. 55 and a valve No. fourteen (65), allowing exhaust steam from a high-pressure cylinder (6) of the steam turbine to directly enter a fourth temperature and pressure reduction device (17), and conveying the exhaust steam to a steam heat accumulator (18) for heat accumulation by opening a valve No. 66 after temperature and pressure reduction;
or opening a fourteen valve (65), a seventh valve (57) and a eighth valve (58), wherein the hot re-steam from the reheater (505) firstly passes through a second temperature and pressure reducing device (15) to be subjected to primary temperature and pressure reduction, then passes through a fourth temperature and pressure reducing device (17) to be subjected to secondary temperature and pressure reduction, and finally is conveyed to a steam heat accumulator (18) to be subjected to heat accumulation by opening a fifteen valve (66);
or opening a fourteen valve (65), a second valve (52) and a third valve (53), performing primary temperature and pressure reduction on main steam from the high-pressure superheater (506) through a first temperature and pressure reduction device (14), performing temperature and pressure reduction through a fourth temperature and pressure reduction device (17), and finally conveying the main steam to a steam heat accumulator (18) for heat accumulation by opening a fifteen valve (66);
B. when the unit needs to increase the external output electric load, the heat release of steam is mainly carried out through the steam heat accumulator (18), the steam flow entering the steam turbine for doing work is increased, and at the moment:
Closing a fifteenth valve (66), opening a sixteen valve (67), and externally releasing steam by the steam heat accumulator (18); at the moment, an eleven valve (62) is closed, a nineteenth valve (70) is opened, and the steam heat accumulator (18) provides deoxidizing steam for the deoxidizer (13);
or, the eleven valve (62) and the nineteenth valve (70) are opened simultaneously, and the steam heat accumulator (18) not only provides deoxidized steam for the deoxidizer (13) but also provides low-pressure steam supplementing for the low-pressure cylinder (8) of the steam turbine, so that the steam flow entering the low-pressure cylinder (8) of the steam turbine to do work is increased;
when the unit is in a heating working condition and no power peak regulation is required:
the twenty-first valve (71), the twenty-first valve (72), the twenty-second valve (73) and the twenty-third valve (74) are opened, first, heating is carried out on the heat supply network backwater from the heat supply network backwater pipe (47) by utilizing heating steam drainage through the drainage heat exchanger (22), then, the heat supply network backwater from the drainage heat exchanger (22) is subjected to secondary heating by utilizing heating steam through the heat supply network heater (21), and then, the heat supply network backwater is output by the heat supply network water supply pipe (48);
at this time, a specific operation method for supplying heating steam to the heat supply network heater (21) is as follows:
Opening an eleventh valve (62) and using low-pressure steam supplementing from the low-pressure superheater (503) or steam exhaust of the middle pressure cylinder (7) of the steam turbine as heating steam required by the heating network heater (21);
or, opening a twelve-valve (63) and a fourteen-valve (65), enabling medium-pressure steam to enter a third temperature and pressure reduction device (16) to be subjected to temperature and pressure reduction to form low-pressure steam, and then conveying the low-pressure steam to a heating network heater (21) through a heating steam extraction pipe (45);
or, opening a fourteen valve (65), a seventeen valve (68) and an eighteen valve (69), enabling medium-pressure steam to enter a fourth temperature and pressure reduction device (17) for primary temperature and pressure reduction, then entering working equipment (19) for driving power equipment (20) to do work to form low-pressure steam, and then conveying the low-pressure steam to a heating network heater (21) through a heating steam extraction pipe (45);
when the unit is in a heating working condition and has power peak regulation requirements:
A. when the unit needs to reduce the external output electric load, the steam heat storage is mainly carried out through the steam heat accumulator (18), the steam flow entering the steam turbine for doing work is reduced, and the specific operation is as follows:
the fifteen valve (66) is opened, the sixteen valve (67) is closed, and the steam after being subjected to temperature and pressure reduction by the fourth temperature and pressure reduction device (17) is further conveyed to the steam heat accumulator (18) for heat accumulation, so that the steam flow entering the fourth temperature and pressure reduction device (17) is increased, and the steam flow entering the steam turbine for work is reduced;
B. When the unit needs to increase the external output electric load, the steam heat is released mainly through the steam heat accumulator (18), the steam flow entering the steam turbine for doing work is increased, and the specific operation is as follows:
closing a fifteenth valve (66), opening a sixteen valve (67), and externally releasing steam by the steam heat accumulator (18); at this time, eleven valves (62), twelve valves (63), thirteen valves (64), fourteen valves (65), seventeen valves (68) and eighteen valves (69) are also closed, and the heating steam source required by the heating network heater (21) is only the steam heat accumulator (18).
5. The method of operating a combined cycle plant based on a coupling of heat supply and power peak shaving as claimed in claim 4,
the specific operation method for providing medium-pressure steam for the third temperature and pressure reducing device (16) and the fourth temperature and pressure reducing device (17) is as follows:
opening a valve No. 55, and directly taking exhaust steam from a high-pressure cylinder 6 of the steam turbine as a medium-pressure steam source of the third temperature and pressure reducing device 16 and the fourth temperature and pressure reducing device 17;
or opening a valve (57) and a valve (58) to form steam with lower pressure and temperature after the hot re-steam from the reheater (505) passes through the second temperature and pressure reducing device (15), wherein the steam is used as a medium-pressure steam source of the third temperature and pressure reducing device (16) and the fourth temperature and pressure reducing device (17);
Or opening a second valve (52) and a third valve (53), and forming steam with lower pressure and temperature after the main steam from the high-pressure superheater (506) passes through the first temperature and pressure reducing device (14) as a medium-pressure steam source of the third temperature and pressure reducing device (16) and the fourth temperature and pressure reducing device (17).
6. The method of operating a combined cycle plant based on a coupling of heat supply and power peak shaving as claimed in claim 4,
when the unit provides heating steam for the heat supply network heater (21), the low-pressure steam supplementing of the low-pressure superheater (503) or the steam exhaust of the middle pressure cylinder (7) of the steam turbine are preferentially selected, the steam exhaust of the acting equipment (19) is selected, and the temperature and pressure reduction steam of the third temperature and pressure reduction device (16) is selected;
when the unit provides medium-pressure steam for the third temperature and pressure reduction device (16) and the fourth temperature and pressure reduction device (17), the high-pressure exhaust steam of the high-pressure cylinder (6) of the steam turbine is preferentially selected and utilized, the hot re-steam of the reheater (505) is selected and utilized, and the main steam of the high-pressure superheater (506) is selected and utilized.
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| CN110247410B (en) * | 2019-06-11 | 2021-05-28 | 中国神华能源股份有限公司 | Peak regulation processing method, device and system for heat supply unit |
| CN110566295B (en) * | 2019-07-27 | 2021-11-26 | 华电电力科学研究院有限公司 | Double-unit coupling peak shaving method and device based on power plant electricity and heat load cooperative scheduling |
| CN111219702B (en) * | 2020-01-16 | 2021-04-13 | 华电电力科学研究院有限公司 | System safety protection device for heat supply during shutdown of steam turbine and operation method thereof |
| CN112833378B (en) * | 2020-12-28 | 2022-01-18 | 东方电气集团东方汽轮机有限公司 | Reheating system capable of improving heat supply capacity |
| CN113007765B (en) * | 2021-02-26 | 2022-03-22 | 无锡新联热力有限公司 | Multi-heat-source mixed supply automatic regulating system for heating steam and scheduling method |
| CN113638807B (en) * | 2021-09-15 | 2022-09-27 | 西安热工研究院有限公司 | Heating system and method for bypass auxiliary cylinder cutting of gas-steam combined cycle unit |
| CN114017149A (en) * | 2021-09-18 | 2022-02-08 | 华能国际电力江苏能源开发有限公司南通电厂 | Heat supply steam source matching system and method under deep peak regulation working condition |
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