CN109854315B - Heating system for gas-steam combined cycle unit steam extraction integration and operation method thereof - Google Patents
Heating system for gas-steam combined cycle unit steam extraction integration and operation method thereof Download PDFInfo
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Abstract
The invention relates to a heating system for steam extraction integration of a gas-steam combined cycle unit and an operation method thereof, belonging to the technical field of cogeneration. The invention comprises 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; 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 and pressure reduction device, a second temperature and pressure reduction device, a third temperature and pressure reduction device, working equipment, power equipment, a heat supply network heater, a drainage heat exchanger and a heat supply network circulating pump. Based on the energy cascade utilization principle, the invention performs integrated design of different steam extraction modes, effectively improves the operation capability of the thermal-electrolytic coupling of the combined cycle unit, and ensures the heating requirements of residents.
Description
Technical Field
The invention belongs to the technical field of cogeneration, and particularly relates to a heating system for steam extraction integration of a gas-steam combined cycle unit 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 heating system for steam extraction integration of a gas-steam combined cycle unit, which is reasonable in design and reliable in performance, and an operation method thereof.
The invention solves the problems by adopting the following technical scheme: a heating system for gas steam combined cycle unit extraction integration, characterized by 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, 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, 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 seven 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 four 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 fourteen 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 thirteen-size valve 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 second-size valve, a first temperature and pressure reducing device and a third-size valve 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, a valve No. nine is arranged on the first medium pressure steam branch pipe, the steam inlet end of the hot re-steam bypass is connected with a hot re-steam pipe, the steam outlet end of the hot re-steam bypass is connected with the steam inlet end of the first medium pressure steam branch pipe, a valve No. five, a second temperature and pressure reducing device and a valve No. six are sequentially arranged on the hot re-steam bypass along the steam flow direction, the steam inlet end of the cold re-steam bypass is connected with a cold re-steam pipe, the steam outlet end of the cold re-steam bypass is connected with the steam inlet end of the first medium pressure steam branch pipe, a valve No. eight is arranged on the cold re-steam bypass, the steam inlet end of the low pressure steam bypass is connected with a 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, a valve No. fifteen is arranged on the low pressure steam bypass, the steam outlet end of the heating steam extraction pipe is connected with the steam inlet of the heating network heater, the heating steam extraction pipe is provided with seventeen valves, the steam outlet of the third temperature and pressure reducing device is connected with the steam inlet of the heating steam extraction pipe, the steam outlet of the third temperature and pressure reducing device is provided with ten valves, 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, the second medium-pressure steam branch pipe is provided with eleven valves, the steam outlet of the second medium-pressure steam branch pipe is connected with the steam inlet of the working equipment, the steam outlet of the working equipment is connected with the steam inlet of the heating steam extraction pipe, the steam outlet of the working equipment is provided with twelve valves, the drain outlet of the heat supply network heater is connected with the high-temperature drain inlet of the drain heat exchanger, the low-temperature drain outlet of the drain heat exchanger is connected with the water inlet of the condensate pump through the drain water pipe, the eighteen valves are arranged on the drain pipe, the heat supply network water return pipe is connected with the low-temperature water side inlet of the drain heat exchanger, the nine valves and the heat network return pipe are arranged on the heat supply network water return pipe, the heat supply network is connected with the drain heat exchanger, the drain heat exchanger is connected with the water supply network inlet of the heat supply network, and the drain heat exchanger is connected with the water supply network inlet of the twenty-level heat exchanger.
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 and the steam outlet of the acting device simultaneously through a deaeration steam extraction pipe, and a sixteen-number 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.
Further, the third temperature and pressure reducing device is connected with the working equipment in parallel, and simultaneously provides 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 hot re-steam bypass and the steam outlet end of the cold re-steam bypass.
The operation method of the heating system for the extraction integration of the gas-steam combined cycle unit is as follows:
when the unit is in a pure condensation working condition, only opening a first valve, a fourth valve, a seventh valve, a thirteenth valve, a fourteenth valve, a hydraulic butterfly valve, a fifteenth valve and a sixteen 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 heat supply working condition, a nineteenth valve and a twenty-first valve are required to be opened, heating steam is firstly utilized to drain water through a drainage heat exchanger to perform primary heating on the heat supply network backwater, then heating steam is utilized to perform secondary heating on the heat supply network backwater through a heat supply network heater, and then the heat supply network backwater is outputted to supply heat to the outside;
at this time, a specific operation method for providing heating steam for the heat supply network heater is as follows:
opening a fifteenth valve, and taking 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 the valve No. nine and the valve No. ten, enabling the medium-pressure steam to enter a third temperature and pressure reduction device to form low-pressure steam after temperature and pressure reduction, and then conveying the low-pressure steam to a heating network heater through a heating steam extraction pipe;
or opening the eleven valve and the twelve valve, enabling the medium-pressure steam to enter the working equipment to drive the power equipment to do work to form low-pressure steam, and then conveying the low-pressure steam to the heating network heater through the heating steam extraction pipe.
When the unit is in a heat supply working condition, the specific operation method for providing medium-pressure steam for the third temperature and pressure reduction device and the acting equipment is as follows:
opening a valve No. eight, and directly taking exhaust steam from a high-pressure cylinder of the steam turbine as a medium-pressure steam source of a third temperature and pressure reducing device and working equipment;
or opening a valve No. five and a valve No. six, 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 acting equipment;
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 acting equipment.
When the unit is in a heating working condition and heating steam is provided for a heating network heater, firstly, selecting low-pressure steam supplementing of a low-pressure superheater or steam exhaust of a medium-pressure cylinder of a steam turbine, secondly, selecting steam exhaust of working equipment, and finally, selecting temperature and pressure reduction steam by using a third temperature and pressure reduction device;
when the unit is in a heating condition and medium-pressure steam is provided for the third temperature and pressure reduction device and the acting equipment, firstly, the high-pressure exhaust steam of the high-pressure cylinder of the steam turbine is selected and utilized, secondly, the hot re-steam of the reheater is selected and utilized, and finally, 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; 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 overall structure of an embodiment of the present 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, a heating system for steam extraction integration of a gas-steam combined cycle unit in this 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 working device 17, a power device 18, a heat supply network heater 19, a hydrophobic heat exchanger 20 and a heat supply network circulating pump 21, 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 the second generator 9 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, a reheater 505 and a high pressure superheater 506, the water outlet of the flue gas preheater 501 is simultaneously connected with the water inlet of the low pressure steam drum 502 and the water inlet of the high pressure drum 504, the steam outlet of the low pressure steam drum 502 is connected with the steam 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 51, the outlet of the turbine high pressure cylinder 6 is connected with the inlet of the reheater 505 through the cold steam pipe 34, the inlet of the reheater 505 is provided with a valve 57, the outlet of the reheater 505 is connected with the inlet of the turbine medium pressure cylinder 7 through the hot steam pipe 35, the inlet of the turbine medium pressure cylinder 7 is provided with a valve 54, the outlet of the turbine medium pressure cylinder 7 is connected with the inlet of the turbine low pressure cylinder 8 through the communicating pipe 36, the inlet of the turbine low pressure cylinder 8 is provided with a butterfly valve 65, the communicating pipe 36 is connected with one end of the low pressure steam pipe 37, and a fourteen valve 64 is installed at one end of the low pressure steam pipe 37, the steam outlet of the low pressure superheater 503 is connected with the other end of the low pressure steam pipe 37, a thirteenth valve 63 is installed at the other end of the low pressure steam pipe 37, the steam outlet of the low pressure cylinder 8 of the steam turbine is connected with the condenser 10, the water inlet end of the boiler water feed pipe 32 is connected with the condenser 10, the water outlet end of the boiler water feed pipe 32 is connected with the water inlet of the flue gas preheater 501, the condensate pump 11, the shaft seal heater 12 and the deaerator 13 are sequentially installed on the boiler water feed pipe 32 along the water flow direction, the steam inlet end of the high pressure steam bypass 38 is connected with the high pressure steam pipe 33, the steam outlet end of the high pressure steam bypass 38 is connected with the steam inlet end of the first medium pressure steam branch pipe 42, and a second valve 52, the first temperature and pressure reduction device 14 and a third valve 53 are sequentially installed 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 valve No. 59 is arranged on the first medium-pressure steam branch pipe 42, the steam inlet end of the hot re-steam bypass 39 is connected with the hot re-steam pipe 35, the steam outlet end of the hot re-steam bypass 39 is connected with the steam inlet end of the first medium-pressure steam branch pipe 42, a valve No. 55, a second temperature and pressure reduction device 15 and a valve No. six 56 are sequentially arranged on the hot re-steam bypass 39 along the steam flow direction, the steam inlet end of the cold re-steam bypass 40 is connected with the cold re-steam pipe 34, the steam outlet end of the cold re-steam bypass 40 is connected with the steam inlet end of the first medium-pressure steam branch pipe 42, a valve No. 58 is arranged on the cold re-steam bypass 40, 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, the low-pressure steam bypass 41 is provided with a fifteen valve 66, the steam outlet end of the heating steam extraction pipe 45 is connected with the steam inlet of the heating network heater 19, the heating steam extraction pipe 45 is provided with a seventeen valve 68, the steam outlet of the third temperature and pressure reducing device 16 is connected with the steam inlet end of the heating steam extraction pipe 45, the steam outlet of the third temperature and pressure reducing device 16 is provided with a ten valve 60, 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, the second medium-pressure steam branch pipe 43 is provided with an eleven valve 61, the steam outlet end of the second medium-pressure steam branch pipe 43 is connected with the steam inlet of the working equipment 17, the steam outlet of the working equipment 17 is connected with the steam inlet end of the heating steam extraction pipe 45, and twelve-valve 62 is installed at the steam outlet of acting device 17, the drain outlet of heat-supply network heater 19 is connected with the high-temperature drain inlet of drain heat exchanger 20, the low-temperature drain outlet of drain heat exchanger 20 is connected with the water inlet of condensate pump 11 through drain pipe 46, eighteen-valve 69 is installed on drain pipe 46, heat-supply network water return pipe 47 is connected with the low-temperature water side inlet of drain heat exchanger 20, nineteen-valve 70 and heat-supply network circulating pump 21 are installed on heat-supply network water return pipe 47, the low-temperature water side outlet of drain heat exchanger 20 is connected with the water side inlet of heat-supply network heater 19, the water side outlet of heat-supply network heater 19 is connected with heat-supply network water supply pipe 48, and twenty-valve 71 is installed on heat-supply network water supply pipe 48.
In this embodiment, the deaerator 13 is simultaneously connected to the steam outlet end of the low-pressure steam bypass 41, the steam outlet of the third temperature and pressure reduction device 16 and the steam outlet of the acting device 17 through the deaeration extraction pipe 44, and a sixteen-number valve 67 is installed on the deaeration extraction pipe 44.
In this embodiment, the power device 17 drives the power device 18 to do work, the power device 17 is a back press or a screw expander, and the power device 18 is a generator, a heat supply network circulating pump or a condensate pump.
In this embodiment, the third temperature and pressure reducing device 16 is connected in parallel with the work device 17, while providing the deaerator 13 and the heat network heater 19 with the required steam.
In this embodiment, the steam inlet end of the second intermediate-pressure steam branch pipe 43 is also connected to the steam outlet end of the high-pressure steam bypass 38, the steam outlet end of the hot re-steam bypass 39, and the steam outlet end of the cold re-steam bypass 40.
The operation method of the heating system for the extraction integration of the gas-steam combined cycle unit is as follows:
when the unit is in a pure condensation working condition, only opening a first valve 51, a fourth valve 54, a seventh valve 57, a thirteenth valve 63, a fourteenth valve 64, a hydraulic butterfly valve 65, a fifteenth valve 66 and a sixteen valve 67, 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 heat supply working condition, a nineteenth valve 70 and a twenty-first valve 71 are also required to be opened, firstly, heating steam is utilized to drain water through a drainage heat exchanger 20 to perform primary heating on the heat supply network backwater, then heating steam is utilized to perform secondary heating on the heat supply network backwater through a heat supply network heater 19, and then the heat supply network backwater is outputted by a heat supply network water supply pipe 48 to supply heat to the outside;
at this time, a specific operation method for supplying heating steam to the heating grid heater 19 is as follows:
a fifteenth valve 66 is opened, and low-pressure steam supplement from the low-pressure superheater 503 or steam exhaust from the intermediate pressure cylinder 7 of the steam turbine is used as heating steam required by the heating network heater 19;
or opening the valve 59 and the valve 60, allowing the medium-pressure steam to enter the third temperature and pressure reduction device 16, reducing the temperature and pressure to form low-pressure steam, and then conveying the low-pressure steam to the heating network heater 19 through the heating steam extraction pipe 45;
or the eleven valve 61 and the twelve valve 62 are opened, the medium-pressure steam firstly enters the power equipment 17 to drive the power equipment 18 to do work to form low-pressure steam, and then the low-pressure steam is conveyed to the heating network heater 19 through the heating steam extraction pipe 45.
In the specific operation method of the present embodiment, when the unit is in the heating condition, the specific operation method for providing the medium-pressure steam for the third temperature and pressure reduction device 16 and the working device 17 is as follows:
opening a valve No. 58, and directly taking 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 acting equipment 17;
or opening valve number five 55 and valve number six 56, 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 working equipment 17;
alternatively, valve number two 52 and valve number three 53 are opened, and the primary steam from high pressure superheater 506 is passed through first attemperation and depressurization device 14 to form steam at a lower pressure and temperature as a source of medium pressure steam for third attemperation and depressurization device 16 and work equipment 17.
In the specific operation method of this embodiment, when the unit is in the heating condition and heating steam is provided for the heating network heater 19, firstly, low-pressure steam supplementing of the low-pressure superheater 503 or steam discharging of the medium-pressure cylinder 7 of the steam turbine is selected and utilized, secondly, steam discharging of the power equipment 17 is selected and utilized, and finally, temperature and pressure reduction steam of the third temperature and pressure reduction device 16 is selected and utilized;
in the specific operation method of this embodiment, when the unit is in the heating condition and medium-pressure steam is provided for the third temperature and pressure reduction device 16 and the working equipment 17, the high-pressure exhaust steam of the high-pressure cylinder 6 of the steam turbine is selected and utilized firstly, the hot re-steam of the reheater 505 is selected and utilized secondly, and the main steam of the high-pressure superheater 506 is selected and utilized finally.
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 65.
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 under the heating working condition.
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 heating system for gas steam combined cycle unit extraction integration, characterized by 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 working device (17), a power device (18), a heat supply network heater (19), a hydrophobic heat exchanger (20) and a heat supply network circulating pump (21), 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 the second generator (9) 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), a reheater (505) and a high-pressure superheater (506), a water outlet of the preheater (501) is simultaneously connected with a water inlet of the low-pressure drum (502) and a water inlet of the high-pressure drum (504), a high-pressure drum (506) is connected with a steam inlet of the high-pressure drum (502) and a high-pressure drum (503), the steam inlet of the high-pressure cylinder (6) of the steam turbine is connected with the steam outlet of the high-pressure superheater (506) through a high-pressure steam pipe (33), a valve (51) 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 reheater (505) through a cold re-steam pipe (34), a valve (57) 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 cylinder (7) of the steam turbine through a hot re-steam pipe (35), a valve (54) is arranged at the steam inlet of the medium-pressure cylinder (7) of the steam turbine, the steam outlet of the medium-pressure cylinder (7) of the steam turbine is connected with the steam inlet of the low-pressure cylinder (8) of the steam turbine through a communicating pipe (36), a hydraulic pressure (65) is arranged at the steam inlet of the low-pressure cylinder (8) of the steam turbine, the communicating pipe (36) is connected with the low-pressure steam pipe (37) of the steam turbine, a valve (37) is arranged at one end of the low-pressure pipe (37) of the low-pressure pipe, a valve (37) is arranged at the other end of the low-pressure pipe (37) of the steam turbine is connected with the low-pressure cylinder (7), a valve (37) is arranged at the other end of the low-pressure valve (37), and the valve (37) is arranged at the valve (3) of the low-pressure valve, the water inlet end of the boiler water supply pipe (32) is connected with the condenser (10), the water outlet end of the boiler water supply pipe (32) is connected with the 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, the steam inlet end of the high-pressure steam bypass (38) is connected with the high-pressure steam pipe (33), the steam outlet end of the high-pressure steam bypass (38) is connected with the steam inlet end of the 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) 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 reducing device (16), the steam inlet end of the hot re-steam bypass (39) is connected with the hot steam inlet end of the hot steam bypass (35), the steam inlet end of the hot re-steam bypass (39) is sequentially arranged on the first medium-pressure steam branch pipe (42) along the steam flow direction, the steam inlet end of the hot steam bypass (39) is sequentially connected with the fifth valve (55), the steam inlet end of the cold re-steam bypass (40) is connected with the cold re-steam pipe (34), the steam outlet end of the cold re-steam bypass (40) is connected with the steam inlet end of the first medium-pressure steam branch pipe (42), a valve No. eight (58) is arranged on the cold re-steam bypass (40), 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), a valve No. fifteen (66) 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 valve No. seventeen (68) is arranged on the heating steam outlet end of the third temperature and pressure reducing device (16) and the steam inlet end of the heating branch pipe (45), a valve No. ten (60) is arranged at the steam outlet of the third temperature and pressure reducing device (16), the steam inlet end of the second medium-pressure steam bypass (45) is connected with the steam inlet end of the second medium-pressure branch pipe (43) and the steam inlet end of the heating pipe (43) is connected with the steam inlet end of the medium-pressure steam pipe (43), a twelve-valve (62) is arranged at a steam outlet of the working equipment (17), a water drain outlet of the heat supply network heater (19) is connected with a high-temperature water drain inlet of the water drain heat exchanger (20), a low-temperature water drain outlet of the water drain heat exchanger (20) is connected with a water inlet of the condensate pump (11) through a water drain pipe (46), an eighteen-valve (69) is arranged on the water drain pipe (46), a heat supply network water return pipe (47) is connected with a low-temperature water side inlet of the water drain heat exchanger (20), a nineteen-valve (70) and a heat supply network circulating pump (21) are arranged on the heat supply network water return pipe (47), a water side outlet of the water drain heat exchanger (20) is connected with a water side inlet of the heat supply network heater (19), and a twenty-valve (71) is arranged on the heat supply network water supply pipe (48); 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) and the steam outlet of the acting device (17) simultaneously through a deaeration steam extraction pipe (44), and a sixteen-number valve (67) is arranged on the deaeration steam extraction pipe (44); 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 hot re-steam bypass (39) and the steam outlet end of the cold re-steam bypass (40) at the same time.
2. The heating system for steam extraction integration of a gas-steam combined cycle unit according to claim 1, wherein the acting device (17) drives the power device (18) to do work, the acting device (17) is a back press or a screw expander, and the power device (18) is a generator, a heat supply network circulating pump or a condensate pump.
3. Heating system for the extraction integration of gas and steam combined cycle units according to claim 1, characterized in that the third temperature and pressure reducing device (16) is connected in parallel with the work device (17) while providing the deaerator (13) and the heat network heater (19) with the required steam.
4. A method of operating a heating system for extraction integration of a gas-steam combined cycle unit according to any one of claims 1-3, characterized in that the method of operation is as follows:
when the unit is in a pure condensation working condition, only opening a first valve (51), a fourth valve (54), a seventh valve (57), a thirteenth valve (63), a fourteenth valve (64), a hydraulic butterfly valve (65), a fifteenth valve (66) and a sixteen valve (67), wherein the combined cycle unit does not supply heat to the outside, and deoxygenated steam of the deoxygenator (13) is from low-pressure steam supplementing of the low-pressure superheater (503);
when the unit is in a heat supply working condition, a nineteenth valve (70) and a twenty-first valve (71) are also opened, heating steam is firstly utilized to drain water to perform primary heating on the heat supply network backwater through a drainage heat exchanger (20), then heating steam is utilized to perform secondary heating on the heat supply network backwater through a heat supply network heater (19), and then the heat supply network backwater is outputted by a heat supply network water supply pipe (48) to supply heat to the outside;
at this time, a specific operation method for supplying heating steam to the heat supply network heater (19) is as follows:
a fifteenth valve (66) is opened, and low-pressure steam supplementing from the low-pressure superheater (503) or steam exhaust of the middle pressure cylinder (7) of the steam turbine is used as heating steam required by the heating network heater (19);
or opening a valve No. 59 and a valve No. 60, allowing 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 conveying the low-pressure steam to a heating network heater 19 through a heating steam extraction pipe 45;
or opening an eleven valve (61) and a twelve valve (62), enabling the medium-pressure steam to enter the working equipment (17) to drive the power equipment (18) to do work to form low-pressure steam, and then conveying the low-pressure steam to the heating network heater (19) through the heating steam extraction pipe (45).
5. The method for operating a heating system for gas and steam combined cycle unit extraction integration of claim 4, wherein:
when the unit is in a heating working condition, the specific operation method for providing medium-pressure steam for the third temperature and pressure reduction device (16) and the acting equipment (17) is as follows:
opening a valve No. eight (58), and directly taking exhaust steam from a high-pressure cylinder (6) of the steam turbine as a medium-pressure steam source of a third temperature and pressure reducing device (16) and working equipment (17);
or opening a valve number five (55) and a valve number six (56), and enabling the hot re-steam from the reheater (505) to pass through the second temperature and pressure reducing device (15) to form steam with lower pressure and temperature, wherein the steam is used as a medium-pressure steam source of the third temperature and pressure reducing device (16) and the acting equipment (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 acting equipment (17).
6. The method for operating a heating system for gas and steam combined cycle unit extraction integration according to claim 4 or 5, wherein:
when the unit is in a heating condition and heating steam is provided for a heating network heater (19), the low-pressure steam supplementing of the low-pressure superheater (503) or the steam exhausting of the middle pressure cylinder (7) of the steam turbine is preferably selected, the steam exhausting of the working equipment (17) is selected, and the temperature and pressure reducing steam of the third temperature and pressure reducing device (16) is selected;
when the unit is in a heating condition and medium-pressure steam is provided for the third temperature and pressure reduction device (16) and the acting equipment (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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| CN111425272B (en) * | 2020-04-09 | 2022-04-01 | 太原理工大学 | Heat supply control method for gas-steam combined cycle unit |
| 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 |
| CN114810249B (en) * | 2022-04-07 | 2024-02-20 | 西安热工研究院有限公司 | Thermoelectric decoupling system and method for heat supply unit |
| CN114941554B (en) * | 2022-05-09 | 2023-09-08 | 中国船舶重工集团公司第七0三研究所 | Cascade system for heating steam to carry out heat and electricity combined energy and utilization method |
| CN115749985B (en) * | 2022-11-11 | 2024-07-23 | 东方电气集团东方汽轮机有限公司 | Seasonal variable parameter operation method of extraction back type steam turbine |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005214047A (en) * | 2004-01-28 | 2005-08-11 | Toshiba Corp | Combined cycle power generation plant and method of operating the same |
| JP2006194242A (en) * | 2004-12-17 | 2006-07-27 | Hitachi Ltd | Energy supply system, method of supplying energy and method of improving energy supply system |
| RU2432468C1 (en) * | 2010-06-10 | 2011-10-27 | Государственное образовательное учреждение высшего профессионального образования "Саратовский государственный технический университет" (СГТУ) | Steam-turbine thermal power plant operating method and device for its implementation |
| CN102393004A (en) * | 2010-09-30 | 2012-03-28 | 上海锅炉厂有限公司 | Fuel gas-steam combined cycle heat power plant |
| 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 |
| CN106194297A (en) * | 2016-09-27 | 2016-12-07 | 上海电气电站设备有限公司 | The double branch road heating system of a kind of cogeneration turbine |
| CN106246251A (en) * | 2016-10-21 | 2016-12-21 | 上海电气电站设备有限公司 | Combined cycle thermoelectric co-feeding system and height thereof arrange control method of drawing gas |
| CN206035553U (en) * | 2016-09-06 | 2017-03-22 | 上海电气电站设备有限公司 | Cogeneration system of combined cycle |
| CN206267896U (en) * | 2016-11-07 | 2017-06-20 | 上海电气电站设备有限公司 | Combined cycle two-shipper condensing-back pressure formula is drawn gas cogeneration system |
| CN108005741A (en) * | 2017-12-14 | 2018-05-08 | 华电电力科学研究院 | It is a kind of to improve the solidifying back of the body of taking out for thermally safe co-generation unit and adjusting method |
| CN108506057A (en) * | 2018-03-01 | 2018-09-07 | 华电电力科学研究院有限公司 | A kind of co-generation unit and adjusting method for cutting off low pressure (LP) cylinder into vapour |
-
2019
- 2019-02-02 CN CN201910108093.2A patent/CN109854315B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005214047A (en) * | 2004-01-28 | 2005-08-11 | Toshiba Corp | Combined cycle power generation plant and method of operating the same |
| JP2006194242A (en) * | 2004-12-17 | 2006-07-27 | Hitachi Ltd | Energy supply system, method of supplying energy and method of improving energy supply system |
| RU2432468C1 (en) * | 2010-06-10 | 2011-10-27 | Государственное образовательное учреждение высшего профессионального образования "Саратовский государственный технический университет" (СГТУ) | Steam-turbine thermal power plant operating method and device for its implementation |
| CN102393004A (en) * | 2010-09-30 | 2012-03-28 | 上海锅炉厂有限公司 | Fuel gas-steam combined cycle heat power plant |
| 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 |
| CN206035553U (en) * | 2016-09-06 | 2017-03-22 | 上海电气电站设备有限公司 | Cogeneration system of combined cycle |
| CN106194297A (en) * | 2016-09-27 | 2016-12-07 | 上海电气电站设备有限公司 | The double branch road heating system of a kind of cogeneration turbine |
| CN106246251A (en) * | 2016-10-21 | 2016-12-21 | 上海电气电站设备有限公司 | Combined cycle thermoelectric co-feeding system and height thereof arrange control method of drawing gas |
| CN206267896U (en) * | 2016-11-07 | 2017-06-20 | 上海电气电站设备有限公司 | Combined cycle two-shipper condensing-back pressure formula is drawn gas cogeneration system |
| CN108005741A (en) * | 2017-12-14 | 2018-05-08 | 华电电力科学研究院 | It is a kind of to improve the solidifying back of the body of taking out for thermally safe co-generation unit and adjusting method |
| CN108506057A (en) * | 2018-03-01 | 2018-09-07 | 华电电力科学研究院有限公司 | A kind of co-generation unit and adjusting method for cutting off low pressure (LP) cylinder into vapour |
Non-Patent Citations (1)
| Title |
|---|
| Experimental study on cooling performance of a steam-cooled turbine blade with five internal cooling smooth channels;liang xu等;《Experimental Thermal and Fluid Science》;第180-187页 * |
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