CN109869784B - Combined cycle device for steam extraction integration and heat accumulation peak shaving coupling and operation method thereof - Google Patents
Combined cycle device for steam extraction integration and heat accumulation peak shaving coupling and operation method thereof Download PDFInfo
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- CN109869784B CN109869784B CN201910108100.9A CN201910108100A CN109869784B CN 109869784 B CN109869784 B CN 109869784B CN 201910108100 A CN201910108100 A CN 201910108100A CN 109869784 B CN109869784 B CN 109869784B
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Abstract
The invention relates to a combined cycle device for integrating steam extraction and heat accumulation peak shaving and an operation method thereof, 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, and the steam turbine unit comprises a waste heat boiler, a steam turbine high-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 and pressure reducing device, a second temperature and pressure reducing device, a steam heat accumulator, working equipment, power equipment, a heat supply network heater, a drainage heat exchanger and a heat supply network circulating pump; the invention is based on the energy cascade utilization principle and combines the steam residual energy utilization mode to carry out the integrated design of different steam extraction modes, thereby effectively improving the thermal-electrolytic coupling operation capability of the 6FA type combined cycle unit, and simultaneously utilizing the steam heat accumulator, not only improving the peak regulation and frequency modulation capability of the combined cycle unit, but also ensuring the external heating capability of the combined cycle unit under the full working condition.
Description
Technical Field
The invention belongs to the technical field of improving flexibility of thermoelectric units, and particularly relates to a combined cycle device for steam extraction integration and heat storage 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. In the prior art, for example, a patent 'gas-steam combined cycle heat supply system (patent number 201710534092.5)', low-pressure steam supplement of a middle-pressure exhaust steam or waste heat boiler is utilized to provide steam required for heat supply and steam required for refrigeration for the outside, and redundant low-pressure steam supplement can be conveyed into an on-machine steam pipe.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a combined cycle device for integrating steam extraction and heat storage peak regulation and an operation method thereof, wherein the combined cycle device has reasonable design and reliable performance.
The invention solves the problems by adopting the following technical scheme: a combined cycle device for integrating steam extraction and heat storage peak shaving, 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 low pressure cylinder, a second generator, a condenser, a condensate pump, a shaft seal heater, a deaerator, a first temperature and pressure reducing device, a second temperature and pressure reducing device, a steam heat accumulator, working equipment, power equipment, a heat supply network heater, a drainage heat exchanger and a heat supply network circulating pump, wherein the steam turbine high 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 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 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 low-pressure cylinder of the steam turbine through a communicating pipe, a hydraulic butterfly 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 a low-pressure steam pipe, a valve III 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 IV 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 a condenser, the water inlet end of a boiler water supply pipe is connected with a water inlet of a flue gas preheater, and a condensate pump, a condensate pump and a water heater are sequentially arranged on the boiler water supply pipe along the water flowing direction The shaft seal heater and the deaerator, the steam inlet end of the high-pressure steam bypass is connected with the high-pressure steam pipe, the second valve is arranged on the high-pressure steam bypass, the steam inlet end of the first high-pressure steam branch pipe is connected with the steam outlet end of the high-pressure steam bypass, the steam outlet end of the first high-pressure steam branch pipe is connected with the steam inlet of the first temperature and pressure reduction device, the sixth valve is arranged on the first high-pressure steam branch pipe, the steam outlet of the first temperature and pressure reduction device is connected with the steam inlet end of the heating steam extraction pipe, the seventh valve is arranged on the steam outlet of the first temperature and pressure reduction device, the steam inlet end of the second high-pressure steam branch pipe is connected with the steam outlet end of the high-pressure steam bypass, the eighth valve and the second temperature and pressure reduction device are sequentially arranged on the second high-pressure steam branch pipe along the steam flow direction, the steam outlet end of the second high-pressure steam branch pipe is simultaneously connected with the steam inlet of the steam accumulator and the inlet of the acting device, the steam inlet of the steam heat accumulator and the steam inlet of the acting device are respectively provided with a valve with the tenth number and a valve with the ninth number, the steam outlet of the steam heat accumulator is connected with the steam inlet end of a heating steam extraction pipe, the steam outlet of the steam heat accumulator is provided with a valve with the eleventh number, the steam outlet of the acting device is connected with the steam inlet end of the heating steam extraction pipe, the steam outlet of the acting device is provided with a valve with the twelfth number, the steam inlet end of a low-pressure steam bypass is connected with the low-pressure steam pipe, the steam outlet end of the low-pressure steam bypass is connected with the steam inlet end of the heating steam extraction pipe, the valve with the fifth number is arranged on the low-pressure steam bypass, the deaerator is connected with the steam outlet end of the low-pressure steam bypass through a deaerating steam extraction pipe, the valve with the thirteenth number is arranged on the deaerating steam extraction pipe, the steam outlet end of the heating steam extraction pipe is connected with the steam inlet of a heating network heater, and install the fourteen valve on heating steam extraction pipe, the hydrophobic export of heat supply network heater is connected with the high temperature hydrophobic import of hydrophobic heat exchanger, and hydrophobic export of low temperature of hydrophobic heat exchanger is connected with the water inlet of condensate pump through the hydrophobic pipe, and installs fifteen valve on hydrophobic pipe, and heat supply network wet return is connected with the low temperature water side import of hydrophobic heat exchanger, and installs the heat supply network circulating pump on the heat supply network wet return, the water side export of hydrophobic heat exchanger is connected with the water side import of heat supply network heater, and the water side export of heat supply network heater is connected with the heat supply network delivery 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 first temperature and pressure reducing device, the steam heat accumulator and the acting equipment are connected in parallel, and simultaneously required steam is provided for the deaerator and the heat supply network heater.
Furthermore, the deaerator is simultaneously connected with the low-pressure steam bypass, the first temperature and pressure reduction device, the steam heat accumulator and the acting equipment through the deaeration extraction pipe.
Furthermore, the heating network heater is connected with the low-pressure steam bypass, the first temperature and pressure reduction device, the steam heat accumulator and the acting equipment through the heating steam extraction pipe.
Furthermore, the high-pressure steam pipe is connected with the steam inlet end of the first high-pressure steam branch pipe and the steam inlet end of the second high-pressure steam branch pipe through the high-pressure steam bypass.
The operation method of the combined cycle device for integrating steam extraction and heat storage peak shaving is as follows:
when the unit is in a pure condensation working condition and no power peak regulation requirement exists:
opening a first valve, a hydraulic butterfly valve, a third valve, a fourth valve, a fifth valve and a thirteenth valve, wherein 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:
the second valve, the eighth valve and the tenth valve are also opened, and after the high-pressure steam from the high-pressure superheater is subjected to temperature and pressure reduction through the second temperature and pressure reduction device, the high-pressure steam is conveyed to the steam heat accumulator for heat accumulation, so that the steam flow entering the steam turbine for work is reduced, the output power of the unit is reduced, and the load response frequency of the unit is improved;
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:
the valve II, the valve eight and the valve ten are also closed, the valve eleven is opened, the steam heat accumulator provides deoxidized steam for the deoxidizer or provides low-pressure steam supplement for the low-pressure cylinder of the steam turbine, and the steam flow entering the steam turbine for doing work is increased, so that the output power of the unit is increased, and the load response frequency of the unit is improved;
when the unit is in a heating working condition and no power peak regulation is required:
opening a first valve, a hydraulic butterfly valve, a third valve, a fourth valve, a fifth valve, a thirteenth valve, a fourteenth valve and a fifteenth valve, and supplying heat to the outside of the combined cycle unit, wherein the low-pressure steam supplementing of the low-pressure superheater or the steam exhaust of the high-pressure cylinder of the steam turbine is directly used as deoxidizing steam of the deoxidizer and heating steam of the heating network heater;
or opening a second valve, a sixth valve and a seventh valve, wherein the high-pressure steam of the high-pressure superheater is subjected to temperature and pressure reduction through a first temperature and pressure reduction device and then used as deoxidizing steam of the deoxidizer and heating steam of the heating network heater;
or opening a second valve, an eighth valve, a ninth valve and a twelfth valve, wherein the high-pressure steam of the high-pressure superheater drives the working equipment to drive the working, and then the exhaust steam of the working equipment is used as deoxidizing steam of the deoxidizer and heating steam of the heating network heater;
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 second valve, the eighth valve and the tenth valve are also opened, high-pressure steam of the high-pressure superheater enters the second temperature and pressure reduction device and is conveyed to the steam heat accumulator for heat accumulation after temperature and pressure reduction, so that the steam flow entering the steam turbine for work is reduced, the output power of the unit is reduced, and the load response frequency of the unit is improved;
B. when the unit needs to increase the external output electric load, the steam heat accumulator is utilized to replace a low-pressure steam bypass, a first temperature and pressure reduction device and working equipment, so that the steam flow entering the steam turbine for working is increased, and the specific operation is as follows:
closing the valve number five to enable the low-pressure steam bypass to be in a closed state;
closing the second valve, the sixth valve and the seventh valve to ensure that the first temperature and pressure reducing device does not work any more;
closing the second valve, the eighth valve, the tenth valve and the twelfth valve to ensure that the second temperature and pressure reducing device and the acting equipment do not work any more;
at the moment, the valve ten is closed, the valve eleven is opened, deoxidizing steam is provided for the deoxidizer through the steam heat accumulator, heating steam is provided for the heating network heater, the steam flow entering the steam turbine for doing work is increased, and therefore the output power of the unit is increased, and the load response frequency of the unit is improved.
The operation method of the combined cycle device for integrating the steam extraction and the heat storage peak shaving comprises the following steps:
when the unit is in a heat supply working condition and has no power peak regulation requirement, the low-pressure steam supplementing of the low-pressure superheater or the steam exhaust of the high-pressure cylinder of the steam turbine is preferentially selected to be used as deoxidizing steam of the deoxidizer and heating steam of the heat supply network heater, the power-applying equipment is selected to be used for providing deoxidizing steam for the deoxidizer and heating steam for the heat supply network heater, and finally the first temperature and pressure reduction device is selected to be used for providing deoxidizing steam for the deoxidizer and heating steam for the heat supply network heater;
when the unit is in a heat supply working condition and has an electric peak regulation requirement, the steam heat accumulator is preferably selected to provide deoxidizing steam for the deoxidizer and heating steam for the heat supply network heater, then the low-pressure steam supplementing of the low-pressure superheater or the exhaust steam of the high-pressure cylinder of the steam turbine is selected to be used as deoxidizing steam of the deoxidizer and heating steam of the heat supply network heater, the working equipment is selected to be used again to provide deoxidizing steam for the deoxidizer and heating steam for the heat supply network heater, and finally the first temperature and pressure reduction device is selected to provide deoxidizing steam for the deoxidizer and heating steam for the heat supply network heater.
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 and the steam residual energy utilization mode, so that the thermal-electrolytic coupling operation capability of the 6FA type combined cycle unit is effectively improved, and meanwhile, the steam heat accumulator is utilized, so that the peak regulation and frequency modulation capability of the combined cycle unit is improved, and the external heating capability of the combined cycle unit under all working conditions is ensured. After the invention is applied, the cooperative matching of the power peak regulation and the heat supply of the combined cycle unit is realized, the work capability loss in the external heating process under the whole working condition of the unit is effectively reduced, the current severe power peak regulation and frequency modulation policy requirement is met, and the invention has higher practical application value.
Drawings
FIG. 1 is a schematic structural diagram of a combined cycle device for integrating steam extraction and coupling heat storage peak shaving 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 for integrating steam extraction and coupling heat storage peak shaving 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 22, 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 low-pressure cylinder 7, a second generator 8, a condenser 9, a condensate pump 10, a shaft seal heater 11, a deaerator 12, a first temperature and pressure reduction device 13, a second temperature and pressure reduction device 14, a steam heat accumulator 15, a power device 16, a power device 17, a heat supply network heater 18, a drainage heat exchanger 19 and a heat supply network circulating pump 20, the steam turbine high-pressure cylinder 6 and the steam turbine low-pressure cylinder 7 are coaxially connected, the second generator 8 is driven 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 and a high-pressure superheater 505, 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, a steam outlet of the low-pressure steam drum 502 is connected with a steam inlet of the low-pressure superheater 503, a steam outlet of the high-pressure steam drum 504 is connected with a steam inlet of the high-pressure superheater 505, the steam inlet of the high-pressure cylinder 6 of the steam turbine is connected with the steam outlet of the high-pressure superheater 505 through the high-pressure steam pipe 23, a valve 41 is arranged at the steam inlet of the high-pressure cylinder 6 of the steam turbine, the steam outlet of the high-pressure cylinder 6 of the steam turbine is connected with the steam inlet of the low-pressure cylinder 7 of the steam turbine through a communicating pipe 25, a hydraulic butterfly valve 43 is arranged at the steam inlet of the low-pressure cylinder 7 of the steam turbine, the communicating pipe 25 is connected with one end of a low-pressure steam pipe 26, a valve 44 is arranged at one end of the low-pressure steam pipe 26, the steam outlet of the low-pressure superheater 503 is connected with the other end of the low-pressure steam pipe 26, a valve 45 is arranged at the other end of the low-pressure steam pipe 26 of the steam turbine, the steam outlet of the low-pressure cylinder 7 of the steam turbine is connected with a condenser 9, the water inlet end of a boiler water supply pipe 21 is connected with the condenser 9, the water outlet end of the boiler water supply pipe 21 is connected with the water inlet of the flue gas preheater 501, and a condensate pump 10, a shaft seal heater 11 and a deaerator 12 are sequentially arranged on a boiler water supply pipe 21 along the water flowing direction, the steam inlet end of a high-pressure steam bypass 24 is connected with a high-pressure steam pipe 23, a second valve 42 is arranged on the high-pressure steam bypass 24, the steam inlet end of a first high-pressure steam branch pipe 27 is connected with the steam outlet end of the high-pressure steam bypass 24, the steam outlet end of the first high-pressure steam branch pipe 27 is connected with the steam inlet of a first temperature and pressure reducing device 13, a sixth valve 47 is arranged on the first high-pressure steam branch pipe 27, the steam outlet of the first temperature and pressure reducing device 13 is connected with the steam inlet end of a heating steam extraction pipe 31, a seventh valve 48 is arranged on the steam outlet of the first temperature and pressure reducing device 13, the steam inlet end of a second high-pressure steam branch pipe 28 is connected with the steam outlet end of the high-pressure steam bypass 24, the second high-pressure steam branch pipe 28 is provided with a valve 49 and a second temperature and pressure reducing device 14 in sequence along the steam flowing direction, the steam outlet end of the second high-pressure steam branch pipe 28 is connected with the steam inlet of the steam heat accumulator 15 and the steam inlet of the working equipment 16 at the same time, the steam inlet of the steam heat accumulator 15 and the steam inlet of the working equipment 16 are respectively provided with a valve 51 and a valve 50, the steam outlet of the steam heat accumulator 15 is connected with the steam inlet of the heating steam extraction pipe 31, the steam outlet of the steam heat accumulator 15 is provided with a valve 52, the steam outlet of the working equipment 16 is connected with the steam inlet of the heating steam extraction pipe 31, the steam outlet of the working equipment 16 is provided with a valve 53, the steam inlet of the low-pressure steam bypass 29 is connected with the low-pressure steam pipe 26, the steam outlet end of the low-pressure steam bypass 29 is connected with the steam inlet of the heating steam extraction pipe 31, the low-pressure steam bypass 29 is provided with a valve 46, the deaerator 12 is connected with the steam outlet end of the low-pressure steam bypass 29 through the deaeration steam extraction pipe 30, a thirteen valve 54 is installed on the deaeration steam extraction pipe 30, the steam outlet end of the heating steam extraction pipe 31 is connected with the steam inlet of the heat supply network heater 18, a fourteen valve 55 is installed on the heating steam extraction pipe 31, the water drain outlet of the heat supply network heater 18 is connected with the high-temperature water drain inlet of the water drain heat exchanger 19, the low-temperature water drain outlet of the water drain heat exchanger 19 is connected with the water inlet of the condensate pump 10 through the water drain pipe 32, a fifteen valve 56 is installed on the water drain pipe 32, the heat supply network water return pipe 33 is connected with the low-temperature water side inlet of the water drain heat exchanger 19, the heat supply network circulating pump 20 is installed on the heat supply network water return pipe 33, the water side outlet of the water drain heat exchanger 19 is connected with the water side inlet of the heat supply network heater 18, and the water side outlet of the heat supply network heater 18 is connected with the heat supply network water supply pipe 34.
The acting device 16 drives the power device 17 to do work, the acting device 16 is a back press or a screw expander, and the power device 17 is a generator, a heat supply network circulating pump or a condensate pump and other devices.
The first temperature and pressure reducing device 13, the steam heat accumulator 15 and the power equipment 16 are connected in parallel, and simultaneously provide the deaerator 12 and the heat supply network heater 18 with the required steam.
The deaerator 12 is simultaneously connected with the steam outlet end of the low-pressure steam bypass 29, the steam outlet of the first temperature and pressure reduction device 13, the steam outlet of the steam heat accumulator 15 and the steam outlet of the work-doing equipment 16 through a deaeration extraction pipe 30.
The steam inlet of the heat supply network heater 18 is simultaneously connected with the steam outlet end of the low-pressure steam bypass 29, the steam outlet of the first temperature and pressure reduction device 13, the steam outlet of the steam heat accumulator 15 and the steam outlet of the work-doing equipment 16 through a heating steam extraction pipe 31.
The high-pressure steam pipe 23 is connected to both the steam inlet end of the first high-pressure steam branch pipe 27 and the steam inlet end of the second high-pressure steam branch pipe 28 through the high-pressure steam bypass 24.
The specific operation method of the combined cycle device for integrating steam extraction and coupling heat storage peak shaving in the embodiment is as follows:
when the unit is in a pure condensation working condition and no power peak regulation requirement exists:
opening a valve 41, a hydraulic butterfly valve 43, a valve 44, a valve 45, a valve 46 and a valve 54, wherein the combined cycle unit does not supply heat to the outside, and the deoxygenated steam of the deoxygenator 12 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 15, reduce the steam flow who gets into the steam turbine and do work, this moment:
the second valve 42, the eighth valve 49 and the tenth valve 51 are also opened, and the high-pressure steam from the high-pressure superheater 505 is subjected to temperature and pressure reduction through the second temperature and pressure reduction device 14 and then is conveyed to the steam heat accumulator 15 for heat accumulation, so that the steam flow entering the steam turbine for acting is reduced, the unit output power is reduced, and the unit load response frequency is improved;
B. when the unit needs to increase the external output electric load, the steam heat is released mainly through the steam heat accumulator 15, the steam flow entering the steam turbine for doing work is increased, and at the moment:
the valve No. two 42, the valve No. eight 49 and the valve No. ten 51 are also closed, the valve No. eleven 52 is opened, the steam heat accumulator 15 provides deoxidized steam for the deoxidizer 12 or provides low-pressure steam supplement for the low-pressure cylinder 7 of the steam turbine, and the steam flow entering the steam turbine for doing work is increased, so that the output power of the unit is increased, and the load response frequency of the unit is improved;
when the unit is in a heating working condition and no power peak regulation is required:
opening a first valve 41, a hydraulic butterfly valve 43, a third valve 44, a fourth valve 45, a fifth valve 46, a thirteenth valve 54, a fourteen valve 55 and a fifteen valve 56, and heating the combined cycle unit, wherein the low-pressure steam supplementing of the low-pressure superheater 503 or the steam exhausting of the high-pressure cylinder 6 of the steam turbine is directly used as deoxidizing steam of the deoxidizer 12 and heating steam of the heating network heater 18;
or, opening the valve 42, the valve 47 and the valve 48, and using the high-pressure steam of the high-pressure superheater 505 as deoxidized steam of the deoxidizer 12 and heating steam of the heating network heater 18 after the high-pressure steam is subjected to temperature and pressure reduction through the first temperature and pressure reduction device 13;
or, opening the valve No. two 42, the valve No. eight 49, the valve No. nine 50 and the valve No. twelve 53, wherein the high-pressure steam of the high-pressure superheater 505 drives the working equipment 16 to do work, and then the exhaust steam of the working equipment 16 is used as deoxidizing steam of the deoxidizer 12 and heating steam of the heating network heater 18;
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 15, the steam flow entering the steam turbine for doing work is reduced, and the specific operation is as follows:
the second valve 42, the eighth valve 49 and the tenth valve 51 are also opened, high-pressure steam of the high-pressure superheater 505 enters the second temperature and pressure reduction device 14, is conveyed to the steam heat accumulator 15 for heat accumulation after temperature reduction and pressure reduction, and reduces the steam flow entering the steam turbine for work, so that the unit output power is reduced, and the unit load response frequency is improved;
B. when the unit needs to increase the external output electric load, the steam heat accumulator 15 is utilized to replace the low-pressure steam bypass 29, the first temperature and pressure reduction device 13 and the acting equipment 16, so that the steam flow entering the steam turbine to act is increased, and the specific operation is as follows:
valve number five 46 is closed, and the low pressure steam bypass 29 is closed;
closing the valve No. 42, the valve No. 47 and the valve No. 48 to ensure that the first temperature and pressure reducing device 13 does not work any more;
closing the second valve 42, the eighth valve 49, the tenth valve 51 and the twelfth valve 53 to make the second temperature and pressure reducing device 14 and the working equipment 16 no longer work;
at this time, the tenth valve 51 is also closed, the eleventh valve 52 is opened, deoxidizing steam is provided for the deoxidizer 12 and heating steam is provided for the heat supply network heater 18 through the steam heat accumulator 15, and the steam flow entering the steam turbine for doing work is increased, so that the output power of the unit is increased, and the load response frequency of the unit is improved.
In the operation method, the following steps are adopted:
when the unit is in a heat supply working condition and no power peak regulation requirement exists, the low-pressure steam supplementing of the low-pressure superheater 503 or the steam exhaust of the high-pressure cylinder 6 of the steam turbine is preferably selected to be used as deoxidizing steam of the deoxidizer 12 and heating steam of the heat supply network heater 18, the power equipment 16 is selected to be used for providing deoxidizing steam for the deoxidizer 12 and heating steam for the heat supply network heater 18, and the first temperature and pressure reducing device 13 is selected to be used for providing deoxidizing steam for the deoxidizer 12 and heating steam for the heat supply network heater 18;
when the unit is in a heat supply working condition and has an electric peak regulation requirement, the steam heat accumulator 15 is preferably used for providing deoxidizing steam for the deoxidizer 12 and providing heating steam for the heat supply network heater 18, then the low-pressure steam supplementing of the low-pressure superheater 503 or the exhaust steam of the high-pressure cylinder 6 of the steam turbine is selected to be used as deoxidizing steam of the deoxidizer 12 and heating steam of the heat supply network heater 18, the working equipment 16 is selected to be used again for providing deoxidizing steam for the deoxidizer 12 and providing heating steam for the heat supply network heater 18, and finally the first temperature and pressure reduction device 13 is selected to be used for providing deoxidizing steam for the deoxidizer 12 and providing heating steam for the heat supply network heater 18.
In the specific operation method of this embodiment, all valves have the function of adjusting the fluid flow of the pipeline; other valves than the hydraulic butterfly valve 43 have a shut-off function.
In the specific operation method of the embodiment, the opening adjustment of all valves is completed through the remote operation of the DCS control system of the combined cycle unit; the heat storage and release capacity and time of the steam heat accumulator 15 are determined by considering comprehensive factors such as power deep peak regulation and frequency modulation requirements, unit external heating capacity, unit steam extraction integrated system regulation capacity and the like.
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 (5)
1. A combined cycle device for integrating steam extraction and heat storage peak shaving, 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 (22), 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 low-pressure cylinder (7), a second generator (8), a condenser (9), a condensate pump (10), a shaft seal heater (11), a deaerator (12), a first temperature and pressure reducing device (13), a second temperature and pressure reducing device (14), a steam heat accumulator (15), a power equipment (16), a heat supply network heater (18), a hydrophobic heat exchanger (19) and a heat supply network circulating pump (20), the steam turbine high-pressure cylinder (6) and the steam turbine low-pressure cylinder (7) are coaxially connected, and the second generator (8) is driven 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) and a high-pressure superheater (505), 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), an outlet of the low-pressure steam drum (502) is connected with a high-pressure steam drum (503) steam inlet of the high-pressure steam drum (505), the steam inlet of the high-pressure cylinder (6) of the steam turbine is connected with the steam outlet of the high-pressure superheater (505) through a high-pressure steam pipe (23), a first valve (41) is arranged at the steam inlet of the high-pressure cylinder (6) of the steam turbine, the steam outlet of the high-pressure cylinder (6) of the steam turbine is connected with the steam inlet of the low-pressure cylinder (7) of the steam turbine through a communicating pipe (25), a hydraulic butterfly valve (43) is arranged at the steam inlet of the low-pressure cylinder (7) of the steam turbine, the communicating pipe (25) is connected with one end of a low-pressure steam pipe (26), a third valve (44) is arranged at one end of the low-pressure steam pipe (26), the steam outlet of the low-pressure superheater (503) is connected with the other end of the low-pressure steam pipe (26), a fourth valve (45) is arranged at the other end of the low-pressure steam pipe (26), the steam outlet of the low-pressure cylinder (7) of the steam turbine is connected with a condenser (9), the water inlet end of a boiler pipe (21) is connected with the condenser (9), the water inlet of the boiler (21) is connected with the water inlet of the boiler (21) and the water heater (11) in turn, the water inlet of the boiler (21) is connected with the high-pressure steam pipe (24) of the high-pressure steam pipe (11) in turn, the water heater (11) is connected with the water inlet of the high-pressure steam pipe (11), the second valve (42) is arranged on the high-pressure steam bypass (24), the steam inlet end of the first high-pressure steam branch pipe (27) is connected with the steam outlet end of the high-pressure steam bypass (24), the steam outlet end of the first high-pressure steam branch pipe (27) is connected with the steam inlet of the first temperature and pressure reduction device (13), the first high-pressure steam branch pipe (27) is provided with the sixth valve (47), the steam outlet of the first temperature and pressure reduction device (13) is connected with the steam inlet end of the heating steam extraction pipe (31), the steam inlet end of the first temperature and pressure reduction device (13) is provided with the seventh valve (48), the steam inlet end of the second high-pressure steam branch pipe (28) is connected with the steam outlet end of the high-pressure steam bypass (24), the second high-pressure steam branch pipe (28) is provided with the eighth valve (49) and the second temperature and pressure reduction device (14) in sequence along the steam flow direction, the steam outlet end of the second high-pressure steam branch pipe (28) is simultaneously connected with the steam inlet end of the steam heater (15) and the steam inlet (16) and the steam inlet of the heating device (15) and the steam inlet end of the heating device (50) respectively, the steam inlet end of the second high-pressure steam branch pipe (28) is provided with the steam inlet end of the heating device (15) and the steam inlet end of the heating device (15), the steam outlet of the working equipment (16) is connected with the steam inlet of a heating steam extraction pipe (31), a twelve-number valve (53) is arranged at the steam outlet of the working equipment (16), the steam inlet of a low-pressure steam bypass (29) is connected with a low-pressure steam pipe (26), the steam outlet of the low-pressure steam bypass (29) is connected with the steam inlet of the heating steam extraction pipe (31), a five-number valve (46) is arranged on the low-pressure steam bypass (29), the deaerator (12) is connected with the steam outlet of the low-pressure steam bypass (29) through a deaeration steam extraction pipe (30), a thirteen-number valve (54) is arranged on the deaeration steam extraction pipe (30), the steam outlet of the heating steam extraction pipe (31) is connected with the steam inlet of a heating network heater (18), a fourteen-number valve (55) is arranged on the heating steam extraction pipe (31), the water drain outlet of the heating network heater (18) is connected with the high-temperature inlet of a water drain heat exchanger (19), the water drain low-drain heat exchanger (19) is connected with the water return pipe (33) through a water drain-back pipe (32) and the water return pipe (32) is arranged on the water return pipe (33), the low-temperature water side outlet of the hydrophobic heat exchanger (19) is connected with the water side inlet of the heat supply network heater (18), and the water side outlet of the heat supply network heater (18) is connected with the heat supply network water supply pipe (34); the deaerator (12) is simultaneously connected with the low-pressure steam bypass (29), the first temperature and pressure reduction device (13), the steam heat accumulator (15) and the acting equipment (16) through a deaeration extraction pipe (30); the heating network heater (18) is simultaneously connected with the low-pressure steam bypass (29), the first temperature and pressure reduction device (13), the steam heat accumulator (15) and the acting equipment (16) through a heating steam extraction pipe (31); the high-pressure steam pipe (23) is connected with the steam inlet end of the first high-pressure steam branch pipe (27) and the steam inlet end of the second high-pressure steam branch pipe (28) through the high-pressure steam bypass (24) at the same time.
2. The combined cycle device for integrating steam extraction and heat storage peak regulation coupling according to claim 1, wherein the power equipment (16) drives the power equipment (17) to do work, the power equipment (16) is a back press or a screw expander, and the power equipment (17) is a generator, a heat supply network circulating pump or a condensate pump.
3. The combined cycle device for integration of steam extraction and peak shaving coupling of heat storage according to claim 1, wherein the first temperature and pressure reducing device (13), the steam heat accumulator (15) and the power plant (16) are connected in parallel, while providing the deaerator (12) and the heat network heater (18) with the required steam.
4. A method of operating a combined cycle plant for steam extraction integration and heat storage peaking coupling as claimed in 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:
opening a first valve (41), a hydraulic butterfly valve (43), a third valve (44), a fourth valve (45), a fifth valve (46) and a thirteenth valve (54), wherein the combined cycle unit does not supply heat to the outside, and the deoxidized steam of the deoxidizer (12) 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 (15), reduce the steam flow who gets into the steam turbine and do work, this moment:
the second valve (42), the eighth valve (49) and the tenth valve (51) are also opened, high-pressure steam from the high-pressure superheater (505) is subjected to temperature and pressure reduction through the second temperature and pressure reduction device (14) and then is conveyed to the steam heat accumulator (15) for heat accumulation, so that the steam flow entering the steam turbine for work is reduced, the output power of the unit is reduced, and the load response frequency of the unit is improved;
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 (15), the steam flow entering the steam turbine for doing work is increased, and at the moment:
the valve II (42), the valve eighth (49) and the valve tenth (51) are closed, the valve eleventh (52) is opened, the steam heat accumulator (15) provides deoxidized steam for the deoxidizer (12) or provides low-pressure steam supplementing for the low-pressure cylinder (7) of the steam turbine, and the steam flow entering the steam turbine for acting is increased, so that the output power of the unit is increased, and the load response frequency of the unit is improved;
when the unit is in a heating working condition and no power peak regulation is required:
opening a first valve (41), a hydraulic butterfly valve (43), a third valve (44), a fourth valve (45), a fifth valve (46), a thirteenth valve (54), a fourteen valve (55) and a fifteen valve (56), and supplying heat to the outside of the combined cycle unit, wherein the low-pressure steam supplementing of a low-pressure superheater (503) or the steam exhausting of a high-pressure cylinder (6) of a steam turbine is directly used as deoxidizing steam of a deoxidizer (12) and heating steam of a heating network heater (18);
or opening a second valve (42), a sixth valve (47) and a seventh valve (48), wherein the high-pressure steam of the high-pressure superheater (505) is subjected to temperature and pressure reduction through a first temperature and pressure reduction device (13) and then is used as deoxidizing steam of the deoxidizer (12) and heating steam of the heat supply network heater (18);
or opening a second valve (42), an eighth valve (49), a ninth valve (50) and a twelfth valve (53), wherein the high-pressure steam of the high-pressure superheater (505) firstly drives the working equipment (16) to do work, and then uses the exhaust steam of the working equipment (16) as the deoxidizing steam of the deoxidizer (12) and the heating steam of the heating network heater (18);
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 (15), the steam flow entering the steam turbine for doing work is reduced, and the specific operation is as follows:
the second valve (42), the eighth valve (49) and the tenth valve (51) are also opened, high-pressure steam of the high-pressure superheater (505) enters the second temperature and pressure reduction device (14), is conveyed to the steam heat accumulator (15) for heat accumulation after temperature and pressure reduction, and reduces the steam flow entering the steam turbine for work, so that the output power of the unit is reduced, and the load response frequency of the unit is improved;
B. when the unit needs to increase the external output electric load, the low-pressure steam bypass (29), the first temperature and pressure reduction device (13) and the acting equipment (16) are replaced by the steam heat accumulator (15), so that the steam flow entering the steam turbine to do work is increased, and the specific operation is as follows:
closing the valve number five (46) to enable the low-pressure steam bypass (29) to be in a closed state;
closing the second valve (42), the sixth valve (47) and the seventh valve (48) to ensure that the first temperature and pressure reducing device (13) does not work any more;
closing the second valve (42), the eighth valve (49), the tenth valve (51) and the twelfth valve (53) to ensure that the second temperature and pressure reducing device (14) and the acting equipment (16) do not work any more;
at the moment, a ten-valve (51) is also closed, an eleven-valve (52) is opened, deoxidizing steam is provided for the deoxidizer (12) and heating steam is provided for the heat supply network heater (18) through the steam heat accumulator (15), and the steam flow entering the steam turbine for doing work is increased, so that the output power of the unit is increased, and the load response frequency of the unit is improved.
5. The method of operating a combined cycle device for steam extraction integration and heat storage peak shaving coupling of claim 4, wherein:
when the unit is in a heat supply working condition and no power peak regulation requirement exists, the low-pressure steam supplementing of the low-pressure superheater (503) or the exhaust steam of the high-pressure cylinder (6) of the steam turbine is preferentially selected to be used as deoxidizing steam of the deoxidizer (12) and heating steam of the heat supply network heater (18), the power equipment (16) is selected to be used for providing deoxidizing steam for the deoxidizer (12) and heating steam for the heat supply network heater (18), and the first temperature and pressure reduction device (13) is selected to be used for providing deoxidizing steam for the deoxidizer (12) and heating steam for the heat supply network heater (18);
when the unit is in a heat supply working condition and has power peak regulation requirements, the steam heat accumulator (15) is preferably used for providing deoxidizing steam for the deoxidizer (12) and heating steam for the heat supply network heater (18), then the low-pressure steam supplementing of the low-pressure superheater (503) or the steam exhaust of the high-pressure cylinder (6) of the steam turbine is selected to be used as deoxidizing steam of the deoxidizer (12) and heating steam of the heat supply network heater (18), the power-applying equipment (16) is selected to be used for providing deoxidizing steam for the deoxidizer (12) and heating steam for the heat supply network heater (18), and finally the first temperature and pressure reducing device (13) is selected to be used for providing deoxidizing steam for the deoxidizer (12) and heating steam for the heat supply network heater (18).
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| CN111271750B (en) * | 2020-03-18 | 2024-02-20 | 青岛达能环保设备股份有限公司 | Coal-fired power plant frequency modulation peak shaving system based on heat accumulator |
| CN111425272B (en) * | 2020-04-09 | 2022-04-01 | 太原理工大学 | Heat supply control method for gas-steam combined cycle unit |
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| JPS5823204A (en) * | 1981-08-03 | 1983-02-10 | Mitsui Eng & Shipbuild Co Ltd | Steam accumulator |
| CN2736547Y (en) * | 2004-10-25 | 2005-10-26 | 李化成 | Gas turbine cogenerator |
| CN103452611A (en) * | 2013-09-05 | 2013-12-18 | 上海电气电站设备有限公司 | Combined-cycle combined heat and power system |
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