CN109854319B - Coupling pressure matching combined cycle steam extraction and heat supply integrated system and operation method thereof - Google Patents
Coupling pressure matching combined cycle steam extraction and heat supply integrated system and operation method thereof Download PDFInfo
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Abstract
The invention relates to a coupling pressure matching combined cycle steam extraction and heat supply integrated system and an operation method thereof, wherein the coupling pressure matching combined cycle steam extraction and heat supply integrated system 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 generator, and the steam turbine unit comprises a waste heat boiler, a steam turbine high-pressure cylinder, a steam turbine low-pressure cylinder, a generator, a condenser, a condensate pump, a shaft seal heater, a deaerator, a water supplementing pump, a pressure matcher, a temperature and pressure reducing device and a steam heat accumulator; based on the energy cascade utilization principle, and combining the steam pressure matching mode between the steam supply parameter and the steam consumption parameter, the integrated design of different steam extraction modes is carried out, so that the operation capability of the 9E type combined cycle unit thermal electrolytic coupler is effectively improved; meanwhile, the steam heat accumulator is utilized, so that the cooperative matching of the power peak regulation and heat supply of the combined cycle unit is realized, the peak regulation and frequency modulation capacity of the combined cycle unit under the pure condensation working condition is improved, and the power peak regulation of the combined cycle unit under the full working condition is realized.
Description
Technical Field
The invention belongs to the technical field of improving flexibility of thermoelectric units, and particularly relates to a coupling pressure matching combined cycle steam extraction and heat supply integrated system 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 coupling pressure matching combined cycle steam extraction and heat supply integrated system with reasonable design and reliable performance and an operation method thereof.
The invention solves the problems by adopting the following technical scheme: a coupled pressure matched combined cycle steam extraction and heat supply integrated system, 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 water supplementing pump, a first pressure matcher, a first temperature and pressure reducing device, a second pressure matcher, a steam heat accumulator and a second temperature and pressure reducing device, wherein the steam turbine high-pressure cylinder and the steam turbine low-pressure cylinder are connected with the same cylinder 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 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 second valve is arranged at the steam inlet of the high-pressure cylinder of the steam turbine, the steam inlet of the low-pressure cylinder of the steam turbine is connected with the steam outlet of the low-pressure superheater through a low-pressure steam pipe, a fourth valve and a fifth valve are respectively arranged at the steam inlet of the low-pressure cylinder of the steam turbine and the steam outlet of the low-pressure superheater, the steam outlet of the low-pressure cylinder of the steam turbine is connected with a condenser, the water inlet end of a water supply pipe of a boiler is connected with the condenser, the water outlet end of the water supply pipe of the boiler 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 water supply pipe of the boiler along the water flow direction, the deaerator is connected with the low-pressure steam pipe through a deaerator, a nineteenth valve is arranged on the deaerator pipe, the high-pressure steam pipe is connected with the steam inlet end of the high-pressure steam bypass, the third valve is installed on the high-pressure steam bypass, the steam outlet end of the high-pressure steam bypass is connected with the steam inlet end of the first high-pressure steam branch pipe, the ninth valve is installed on the first high-pressure steam branch pipe, the high-pressure steam inlet of the first pressure matcher is connected with the steam outlet end of the first high-pressure steam branch pipe, the low-pressure steam inlet of the first pressure matcher is connected with the low-pressure steam pipe through the second low-pressure steam branch pipe, the tenth valve is installed on the second low-pressure steam branch pipe, the medium-pressure steam outlet of the first pressure matcher is connected with the industrial steam supply pipe, the eleventh valve and the twenty valve are respectively installed on the medium-pressure steam outlet of the first pressure matcher and the industrial steam supply pipe, the steam outlet end of the high-pressure steam bypass is also connected with the steam inlet end of the second high-pressure steam branch pipe, the steam outlet end of the second high-pressure steam branch pipe is connected with the steam inlet of the first temperature and pressure reducing device, the second high-pressure steam branch pipe is provided with a twelve-number valve, the steam outlet of the first temperature and pressure reducing device is connected with an industrial steam supply pipe, the steam outlet of the first temperature and pressure reducing device is provided with a thirteen-number valve, the steam outlet end of the high-pressure steam bypass is also connected with the steam inlet end of a third high-pressure steam branch pipe, the steam outlet end of the third high-pressure steam branch pipe is connected with the high-pressure steam inlet of the second pressure matcher, the third high-pressure steam branch pipe is provided with a fourteen-number valve, the low-pressure steam inlet of the second pressure matcher is connected with the low-pressure steam outlet of a low-pressure cylinder of the steam turbine through a first low-pressure steam extraction pipe, the first low-pressure steam extraction pipe is provided with a six-number valve, the medium-pressure steam outlet of the second pressure matcher is connected with the steam inlet of the steam accumulator through a medium-pressure steam pipe, and a fifteen-number valve is arranged on the medium-pressure steam pipe, a steam outlet of the steam heat accumulator is connected with an industrial steam supply pipe, and a sixteen-number valve is arranged at the steam outlet of the steam heat accumulator.
Further, the boiler water supplementing pipe is connected with a water outlet of the condensate pump, and the water supplementing pump and the valve I are sequentially arranged on the boiler water supplementing pipe along the water flowing direction.
Furthermore, the steam outlet of the steam heat accumulator is also connected with a low-pressure steam pipe through a low-pressure steam bypass, and seventeen valves, a second temperature and pressure reducing device and eighteen valves are sequentially arranged on the low-pressure steam bypass along the steam flowing direction.
Furthermore, the low-pressure steam inlet of the first pressure matcher is also connected with a low-pressure steam extraction port of a low-pressure cylinder of the steam turbine through a second low-pressure steam extraction pipe, and a seventh valve is arranged on the second low-pressure steam extraction pipe.
Furthermore, the low-pressure steam inlet of the second pressure matcher is further connected with the low-pressure steam pipe through a first low-pressure steam branch pipe, and an eighth valve is installed on the first low-pressure steam branch pipe.
Further, the industrial steam supply pipe is connected with the first pressure matcher, the first temperature and pressure reducing device and the steam heat accumulator at the same time.
Further, the high-pressure steam bypass is connected with the first pressure matcher, the first temperature and pressure reducing device and the second pressure matcher at the same time.
The operation method of the coupling pressure matching combined cycle steam extraction and heat supply integrated system comprises the following steps:
when the unit is in a pure condensation working condition and no power peak regulation requirement exists:
opening a second valve, a fourth valve, a fifth valve and a nineteenth 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:
opening a valve III and a valve fourteen, enabling high-pressure steam from the high-pressure superheater to enter a second pressure matcher, opening a valve six or a valve eight, enabling low-pressure steam extracted from a low-pressure cylinder of the steam turbine or low-pressure steam supplemented by the low-pressure superheater to enter the second pressure matcher, and then opening a valve fifteen, and conveying medium-pressure steam from the second pressure matcher to a steam heat accumulator for heat accumulation, so that the steam flow entering the steam turbine for work is reduced;
B. when the unit needs to increase the external output electric load, the heat release of steam is mainly carried out through the steam heat accumulator, the steam flow entering the steam turbine for doing work is increased, and at the moment:
closing a valve III, a valve fourteen, a valve six, a valve eight and a valve fifteen, and simultaneously opening a valve sixteen, a valve seventeen and a valve eighteen, wherein steam output by the steam heat accumulator enters a second temperature and pressure reduction device and is conveyed to a low-pressure cylinder of the steam turbine after temperature and pressure reduction, and deoxidized steam of the deoxidizer comes from the steam heat accumulator, so that the steam flow entering the steam turbine for acting is increased;
when the unit is in a heating working condition and no power peak regulation is required:
the twenty-number valve is opened, steam is supplied to the external heat user through the industrial steam supply pipe, and the specific operation method for supplying steam to the external heat user at the moment is as follows:
opening a third valve, a ninth valve and an eleventh valve, simultaneously opening a seventh valve or a tenth valve, enabling high-pressure steam from the high-pressure superheater to enter a first pressure matcher, enabling low-pressure steam extraction from a low-pressure cylinder of the steam turbine or low-pressure steam supplementing of the low-pressure superheater to enter the first pressure matcher, and outputting medium-pressure steam after matching in the first pressure matcher for providing steam for external heat users;
or opening a third valve, a twelve valve and a thirteenth valve, and enabling high-pressure steam from the high-pressure superheater to enter the first temperature and pressure reduction device, and outputting medium-pressure steam after temperature and pressure reduction for supplying steam to external heat users;
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:
when the first pressure matcher or the first temperature and pressure reduction device is used for providing steam for external heat users, a valve III, a valve fourteen and a valve fifteen are opened, a valve six or a valve eight is opened, high-pressure steam from a high-pressure superheater enters a second pressure matcher, low-pressure steam extraction from a low-pressure cylinder of a steam turbine or low-pressure steam supplement from the low-pressure superheater enters the second pressure matcher, medium-pressure steam is output after matching in the second pressure matcher, and then the steam is conveyed to a steam heat accumulator for heat accumulation, so that the steam flow entering the steam turbine for doing work is reduced;
B. when the unit needs to increase the external output electric load, the steam heat accumulator is utilized to replace the first pressure matcher and the first temperature and pressure reducing device, and the steam heat is released through the steam heat accumulator to supply steam for external heat users, so that the steam flow entering the steam turbine to do work is increased, and the specific operation is as follows:
closing the valve seven, the valve nine, the valve ten and the valve eleven, wherein the first pressure matcher does not work any more;
closing the twelve valves and the thirteenth valve, and stopping the first temperature and pressure reducing device;
closing the third valve, the sixth valve, the eighth valve, the fourteen valve and the fifteen valve, and enabling the second pressure matcher to work no longer;
at this time, the sixteen-number valve is opened, and the steam accumulator outputs steam for supplying steam to external heat users.
The operation method of the coupling pressure matching combined cycle steam extraction and heat supply integrated system comprises the following steps:
when the unit is in a heat supply working condition and has power peak regulation requirement, the steam heat accumulator also outputs steam, the steam is conveyed to the low-pressure cylinder of the steam turbine after being subjected to temperature reduction and pressure reduction through the second temperature reduction and pressure reduction device, and the deoxidized steam of the deoxidizer comes from the steam heat accumulator and is used for increasing the steam flow entering the steam turbine for doing work.
The operation method of the coupling pressure matching combined cycle steam extraction and heat supply integrated system comprises the following steps:
when the unit is in a heat supply working condition and no power peak regulation requirement exists, the first pressure matcher is preferentially selected to supply steam for external heat users, and the first temperature and pressure reduction device is secondly selected to supply steam for the external heat users;
when the unit is in a heat supply working condition and has power peak regulation requirements, the steam heat accumulator is preferentially selected to supply steam to the external heat user, the first pressure matcher is selected to supply steam to the external heat user, and the first temperature and pressure reduction device is selected to supply steam to the external heat user.
Compared with the prior art, the invention has the following advantages and effects: the device has the advantages of simple structure, reasonable design and reliable performance, is based on the energy cascade utilization principle, combines the steam pressure matching mode between the steam supply parameter and the steam consumption parameter to carry out the integrated design of different steam extraction modes, and effectively improves the operation capacity of the 9E type combined cycle unit thermal electrolytic coupler; meanwhile, the steam heat accumulator is utilized, so that the cooperative matching of the power peak regulation and heat supply of the combined cycle unit is realized, the peak regulation and frequency modulation capacity of the combined cycle unit under the pure condensation working condition is improved, and the power peak regulation of the combined cycle unit under the full working condition is realized. After the invention is applied, the working capacity loss in the heat supply process is effectively reduced while the heat supply capacity of the combined cycle unit is deeply excavated; in addition, the current severe power peak regulation and frequency modulation policy requirements are met, deep peak regulation and frequency modulation of the thermal power generating unit are realized, and the thermal power generating unit 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, the coupled pressure-matched combined cycle steam extraction and heat supply integrated system 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 23, 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 water supplementing pump 13, a first pressure matcher 14, a first temperature and pressure reducing device 15, a second pressure matcher 16, a steam heat accumulator 17 and a second temperature and pressure reducing device 18, the steam turbine high-pressure cylinder 6 and the steam turbine low-pressure cylinder 7 are connected with the same cylinder and drive the second generator 8 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 a high-pressure steam pipe 24, a second valve 42 is arranged at the steam inlet of the high-pressure cylinder 6 of the steam turbine, the steam inlet of the low-pressure cylinder 7 of the steam turbine is connected with the steam outlet of the low-pressure superheater 503 through a low-pressure steam pipe 26, a fourth valve 44 and a fifth valve 45 are respectively arranged at the steam inlet of the low-pressure cylinder 7 of the steam turbine and the steam outlet of the low-pressure superheater 503 of the low-pressure cylinder, the steam outlet of the low-pressure cylinder 7 of the steam turbine is connected with the condenser 9, the water inlet end of the 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, a condensate pump 10, a shaft seal heater 11 and a deaerator 12 are sequentially arranged on the boiler water supply pipe 21 along the water flow direction, the deaerator 12 is connected with the low-pressure steam pipe 26 through a deaeration steam extraction pipe 35, and a nineteenth valve 59 is installed on the deoxidizing and steam extracting pipe 35, the high pressure steam pipe 24 is connected with the steam inlet end of the high pressure steam bypass 25, a third valve 43 is installed on the high pressure steam bypass 25, the steam outlet end of the high pressure steam bypass 25 is connected with the steam inlet end of the first high pressure steam branch pipe 30, a ninth valve 49 is installed on the first high pressure steam branch pipe 30, the high pressure steam inlet of the first pressure matcher 14 is connected with the steam outlet end of the first high pressure steam branch pipe 30, the low pressure steam inlet of the first pressure matcher 14 is connected with the low pressure steam pipe 26 through the second low pressure steam branch pipe 31, a tenth valve 50 is installed on the second low pressure steam branch pipe 31, the medium pressure steam outlet of the first pressure matcher 14 is connected with the industrial steam supply pipe 37, eleven valves 51 and twenty valves 60 are installed on the medium pressure steam outlet and the industrial steam supply pipe 37 of the first pressure matcher 14 respectively, the steam outlet end of the high-pressure steam bypass 25 is also connected with the steam inlet end of the second high-pressure steam branch pipe 32, the steam outlet end of the second high-pressure steam branch pipe 32 is connected with the steam inlet of the first temperature and pressure reduction device 15, a twelve-number valve 52 is arranged on the second high-pressure steam branch pipe 32, the steam outlet of the first temperature and pressure reduction device 15 is connected with an industrial steam supply pipe 37, a thirteenth-number valve 53 is arranged on the steam outlet of the first temperature and pressure reduction device 15, the steam outlet end of the high-pressure steam bypass 25 is also connected with the steam inlet end of the third high-pressure steam branch pipe 33, the steam outlet end of the third high-pressure steam branch pipe 33 is connected with the high-pressure steam inlet of the second pressure matcher 16, a fourteen-number valve 54 is arranged on the third high-pressure steam branch pipe 33, the low-pressure steam inlet of the second pressure matcher 16 is connected with the low-pressure steam outlet of the low-pressure cylinder 7 of the steam turbine through a first low-pressure steam extraction pipe 27, and install No. six valves 46 on first low pressure extraction pipe 27, the middling pressure steam outlet of second pressure matcher 16 is connected with the steam inlet of steam accumulator 17 through middling pressure steam pipe 34, and installs fifteen valves 55 on middling pressure steam pipe 34, and the steam outlet of steam accumulator 17 is connected with industry steam supply pipe 37, and installs sixteen valves 56 at the steam outlet of steam accumulator 17.
The boiler water supply pipe 22 is connected to the water outlet of the condensate pump 10, and the water supply pump 13 and the first valve 41 are sequentially installed on the boiler water supply pipe 22 along the water flow direction.
The steam outlet of the steam heat accumulator 17 is also connected to the low-pressure steam pipe 26 through a low-pressure steam bypass 36, and a seventeen valve 57, a second temperature and pressure reducing device 18, and an eighteen valve 58 are installed in this order along the steam flow direction on the low-pressure steam bypass 36.
The low-pressure steam inlet of the first pressure matcher 14 is also connected with the low-pressure steam extraction port of the low-pressure cylinder 7 of the steam turbine through a second low-pressure steam extraction pipe 28, and a seventh valve 47 is arranged on the second low-pressure steam extraction pipe 28.
The low pressure steam inlet of the second pressure matcher 16 is also connected to the low pressure steam pipe 26 via a first low pressure steam branch pipe 29, and a valve No. 48 is mounted on the first low pressure steam branch pipe 29.
The industrial steam supply pipe 37 is connected to the first pressure matching unit 14, the first temperature and pressure reducing device 15, and the steam heat accumulator 17.
The high-pressure steam bypass 25 is connected to the first pressure matching unit 14, the first temperature and pressure reducing device 15, and the second pressure matching unit 16 at the same time.
The operation method of the coupling pressure matching combined cycle steam extraction and heat supply integrated system in the embodiment specifically comprises the following steps:
when the unit is in a pure condensation working condition and no power peak regulation requirement exists:
opening the valve No. two 42, the valve No. four 44, the valve No. five 45 and the valve No. nineteenth 59, wherein the combined cycle unit does not supply heat to the outside, and the deoxidized steam of the deoxidizer 12 comes 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 the steam heat accumulator 17, reduce the steam flow who gets into the steam turbine and do work, this moment:
opening a valve No. 43 and a valve No. 54, enabling high-pressure steam from a high-pressure superheater 505 to enter a second pressure matcher 16, opening a valve No. 46 or a valve No. 48, enabling low-pressure steam extraction from a low-pressure cylinder 7 of a steam turbine or low-pressure steam supplementing of a low-pressure superheater 503 to enter the second pressure matcher 16, opening a valve No. 55, and enabling medium-pressure steam from the second pressure matcher 16 to be conveyed to a steam heat accumulator 17 for heat accumulation, so that steam flow entering a steam turbine for doing work is reduced;
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 17, the steam flow entering the steam turbine for doing work is increased, and at the moment:
closing the valve 43, the valve 54, the valve 46, the valve 48 and the valve 55, and simultaneously opening the valve 56, the valve 57 and the valve 58, wherein the steam accumulator 17 outputs steam to enter the second temperature and pressure reduction device 18, the steam is conveyed to the low-pressure cylinder 7 of the steam turbine after temperature and pressure reduction, and the deoxidized steam of the deoxidizer 12 comes from the steam accumulator 17, so that the steam flow entering the steam turbine for doing work is increased;
when the unit is in a heating working condition and no power peak regulation is required:
the twenty-valve 60 is opened to supply steam to the external heat user through the industrial steam supply pipe 37, and the specific operation method for supplying steam to the external heat user at this time is as follows:
opening a valve No. 43, a valve No. 49 and a valve No. eleven 51, simultaneously opening a valve No. 47 or a valve No. eleven 50, enabling high-pressure steam from a high-pressure superheater 505 to enter a first pressure matcher 14, enabling low-pressure steam extraction from a low-pressure cylinder 7 of a steam turbine or low-pressure steam supplementing of a low-pressure superheater 503 to enter the first pressure matcher 14, and outputting medium-pressure steam after matching in the first pressure matcher 14 for supplying steam to external heat users;
or, opening the valve 43, the valve 52 and the valve 53, and allowing the high-pressure steam from the high-pressure superheater 505 to enter the first temperature and pressure reduction device 15, and outputting medium-pressure steam after temperature and pressure reduction for providing steam for external heat users;
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 17, the steam flow entering the steam turbine for doing work is reduced, and the specific operation is as follows:
while providing steam for external heat users by utilizing the first pressure matcher 14 or the first temperature and pressure reducing device 15, opening a valve No. 43, a valve No. fourteen and a valve No. fifteen 55, and opening a valve No. 46 or a valve No. eight 48, wherein high-pressure steam from the high-pressure superheater 505 enters the second pressure matcher 16, low-pressure steam extraction from the low-pressure cylinder 7 of the steam turbine or low-pressure steam supplementing of the low-pressure superheater 503 enters the second pressure matcher 16, medium-pressure steam is output after matching in the second pressure matcher 16, and then the steam is conveyed to the steam heat accumulator 17 for heat accumulation, so that the steam flow entering the steam turbine for doing work is reduced;
B. when the unit needs to increase the external output electric load, the steam heat accumulator 17 is utilized to replace the first pressure matcher 14 and the first temperature and pressure reducing device 15, and the steam heat is released through the steam heat accumulator 17 to supply steam for external heat users, so that the steam flow entering the steam turbine to do work is increased, and the specific operation is as follows:
closing valve number seven 47, valve number nine 49, valve number ten 50 and valve number eleven 51, the first pressure matcher 14 no longer works;
closing the twelve valve 52 and the thirteenth valve 53, and the first temperature and pressure reducing device 15 is not operated any more;
closing valve number three 43, valve number six 46, valve number eight 48, valve number fourteen 54 and valve number fifteen 55, the second pressure matcher 16 no longer operating;
at this time, the sixteen-numbered valve 56 is opened, and the steam accumulator 17 outputs steam for supplying the external heat user with the steam.
In the specific operation method of this embodiment, when the unit is in the heating condition and there is a power peak regulation requirement, the steam heat accumulator 17 outputs steam, and the steam is conveyed to the low pressure cylinder 7 of the steam turbine after being subjected to temperature and pressure reduction by the second temperature and pressure reduction device 18, and the deoxidized steam of the deoxidizer 12 comes from the steam heat accumulator 17, so as to increase the steam flow entering the steam turbine to do work.
In the specific operation method of the embodiment, when the unit is in the heat supply working condition and no power peak regulation requirement exists, the first pressure matcher 14 is preferentially selected to supply steam for external heat users, and the first temperature and pressure reduction device 15 is secondly selected to supply steam for external heat users;
when the unit is in a heat supply working condition and has power peak regulation requirements, the steam heat accumulator 17 is preferably selected to supply steam to the external heat user, the first pressure matcher 14 is selected to supply steam to the external heat user, and the first temperature and pressure reduction device 15 is selected to supply steam to the external heat user.
In the specific operation method of this embodiment, all valves have not only the function of adjusting the fluid flow of the pipe but also the function of blocking.
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; in addition, the water supplementing flow of the boiler water supply system of the combined cycle unit is jointly determined by the steam flow for external heat supply and the steam flow for heat accumulation and release by the steam heat accumulator 17; the heat storage and release capacity and time of the steam heat accumulator 17 are determined by considering comprehensive factors such as the power deep peak regulation and frequency modulation requirement, the unit external heat supply capacity, the unit 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 (7)
1. A coupled pressure matched combined cycle steam extraction and heat supply integrated system, 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 (23), 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 water supplementing pump (13), a first pressure matcher (14), a first temperature and pressure reducing device (15), a second pressure matcher (16), a steam heat accumulator (17) and a second temperature and pressure reducing device (18), the steam turbine high-pressure cylinder (6) and the steam turbine low-pressure cylinder (7) are connected with the same cylinder and drive the second generator (8) 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 drum (502) is connected with an inlet of the high-pressure steam drum (503), an inlet of the high-pressure drum (505) is connected with an inlet of the high-pressure steam drum (505) through a high-pressure steam pipe (24), and a second valve (42) is arranged at the steam inlet of the turbine high-pressure cylinder (6), the steam inlet of the turbine low-pressure cylinder (7) is connected with the steam outlet of the low-pressure superheater (503) through a low-pressure steam pipe (26), a fourth valve (44) and a fifth valve (45) are respectively arranged at the steam inlet of the turbine low-pressure cylinder (7) and the steam outlet of the low-pressure superheater (503), the steam outlet of the turbine low-pressure cylinder (7) is connected with the condenser (9), the water inlet end of the 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), a condensate pump (10), a shaft seal heater (11) and a deaerator (12) are sequentially arranged on the boiler water supply pipe (21) along the water flow direction, the deaerator (12) is connected with the low-pressure steam pipe (26) through a deaerator (35), the deaerator (35) is provided with a valve, the high-pressure bypass (25) is arranged at the water inlet end of the boiler water supply pipe (21), the high-pressure side pipe (25) is connected with the high-pressure side branch pipe (25) and the high-pressure side steam outlet end (25) is connected with the high-pressure side bypass pipe (25), the first high-pressure steam branch pipe (30) is provided with a valve No. nine (49), a high-pressure steam inlet of the first pressure matcher (14) is connected with a steam outlet end of the first high-pressure steam branch pipe (30), a low-pressure steam inlet of the first pressure matcher (14) is connected with a low-pressure steam pipe (26) through a second low-pressure steam branch pipe (31), a valve No. ten (50) is arranged on the second low-pressure steam branch pipe (31), a medium-pressure steam outlet of the first pressure matcher (14) is connected with an industrial steam supply pipe (37), an eleven valve (51) and a twenty-valve (60) are respectively arranged on the medium-pressure steam outlet of the first pressure matcher (14) and the industrial steam supply pipe (37), a steam outlet end of the high-pressure steam bypass (25) is also connected with a steam inlet end of the second high-pressure steam branch pipe (32), a steam outlet end of the second high-pressure steam branch pipe (32) is connected with a steam inlet of a first temperature reducing device (15), a medium-pressure steam outlet of the first pressure matcher (14) is connected with a steam outlet of the first pressure reducing device (15), a pressure reducing valve No. thirteen is arranged at the steam outlet of the first high-pressure matcher (25) is connected with the steam outlet of the first high-pressure steam branch pipe (30), the steam outlet end of the third high-pressure steam branch pipe (33) is connected with the high-pressure steam inlet of the second pressure matcher (16), a fourteen-number valve (54) is arranged on the third high-pressure steam branch pipe (33), the low-pressure steam inlet of the second pressure matcher (16) is connected with the low-pressure steam outlet of the low-pressure cylinder (7) of the steam turbine through a first low-pressure steam extraction pipe (27), a six-number valve (46) is arranged on the first low-pressure steam extraction pipe (27), the medium-pressure steam outlet of the second pressure matcher (16) is connected with the steam inlet of the steam heat accumulator (17) through a medium-pressure steam pipe (34), a fifteen-number valve (55) is arranged on the medium-pressure steam pipe (34), the steam outlet of the steam heat accumulator (17) is connected with the industrial steam supply pipe (37), and a sixteen-number valve (56) is arranged on the steam outlet of the steam heat accumulator (17); the steam outlet of the steam heat accumulator (17) is also connected with a low-pressure steam pipe (26) through a low-pressure steam bypass (36), and a seventeen valve (57), a second temperature and pressure reducing device (18) and an eighteen valve (58) are sequentially arranged on the low-pressure steam bypass (36) along the steam flowing direction; the low-pressure steam inlet of the first pressure matcher (14) is also connected with a low-pressure steam extraction port of a low-pressure cylinder (7) of the steam turbine through a second low-pressure steam extraction pipe (28), and a seventh valve (47) is arranged on the second low-pressure steam extraction pipe (28); the low-pressure steam inlet of the second pressure matcher (16) is further connected with a low-pressure steam pipe (26) through a first low-pressure steam branch pipe (29), and a valve No. eight (48) is arranged on the first low-pressure steam branch pipe (29).
2. The coupling pressure matching combined cycle steam extraction and heat supply integrated system according to claim 1, wherein a boiler water supplementing pipe (22) is connected with a water outlet of a condensate pump (10), and a water supplementing pump (13) and a valve (41) are sequentially installed on the boiler water supplementing pipe (22) along the water flowing direction.
3. The coupled pressure-matched combined cycle steam extraction and heat supply integrated system according to claim 1, wherein the industrial steam supply pipe (37) is connected with the first pressure matcher (14), the first temperature and pressure reduction device (15) and the steam heat accumulator (17) at the same time.
4. The coupled pressure-matched combined cycle steam extraction and heat supply integrated system according to claim 1, wherein the high-pressure steam bypass (25) is connected with the first pressure matcher (14), the first temperature and pressure reduction device (15) and the second pressure matcher (16) at the same time.
5. A method of operating a coupled pressure matched combined cycle steam extraction and heat supply integrated system as in any one of claims 1-4 wherein the method of operating is as follows:
when the unit is in a pure condensation working condition and no power peak regulation requirement exists:
opening a second valve (42), a fourth valve (44), a fifth valve (45) and a nineteenth valve (59), wherein the combined cycle unit does not supply heat to the outside, and the deoxidized steam of the deoxidizer (12) comes 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 heat accumulator (17), reduce the steam flow who gets into the steam turbine and do work, this moment:
opening a valve III (43) and a valve fourteen (54), enabling high-pressure steam from a high-pressure superheater (505) to enter a second pressure matcher (16), opening a valve VI (46) or a valve VIII (48), enabling low-pressure steam extraction from a low-pressure cylinder (7) of a steam turbine or low-pressure steam supplementing of a low-pressure superheater (503) to enter the second pressure matcher (16), opening a valve fifteen (55), and conveying medium-pressure steam from the second pressure matcher (16) to a steam heat accumulator (17) for heat accumulation, so that the steam flow entering the steam turbine for doing work is reduced;
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 (17), the steam flow entering the steam turbine for doing work is increased, and at the moment:
closing a valve III (43), a valve fourteen (54), a valve six (46), a valve eight (48) and a valve fifteen (55), simultaneously opening a valve sixteen (56), a valve seventeen (57) and a valve eighteen (58), enabling steam output by a steam heat accumulator (17) to enter a second temperature and pressure reduction device (18), reducing temperature and pressure and then conveying the steam to a low-pressure cylinder (7) of a steam turbine, enabling deoxygenated steam of a deaerator (12) to come from the steam heat accumulator (17), and thus increasing steam flow entering the steam turbine for doing work;
when the unit is in a heating working condition and no power peak regulation is required:
the twenty-number valve (60) is opened, steam is supplied to the external heat user through the industrial steam supply pipe (37), and the specific operation method for supplying steam to the external heat user at the moment is as follows:
opening a valve III (43), a valve III (49) and a valve eleven (51), simultaneously opening a valve IV (47) or a valve IV (50), enabling high-pressure steam from a high-pressure superheater (505) to enter a first pressure matcher (14), enabling low-pressure steam extraction from a low-pressure cylinder (7) of a steam turbine or low-pressure steam supplementing of a low-pressure superheater (503) to enter the first pressure matcher (14), and outputting medium-pressure steam after matching in the first pressure matcher (14) for supplying steam to external heat users;
or, opening a third valve (43), a twelve valve (52) and a thirteenth valve (53), enabling high-pressure steam from the high-pressure superheater (505) to enter the first temperature and pressure reduction device (15), and outputting medium-pressure steam after temperature and pressure reduction for supplying steam to external heat users;
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 (17), the steam flow entering the steam turbine for doing work is reduced, and the specific operation is as follows:
when the first pressure matcher (14) or the first temperature and pressure reducing device (15) is used for providing steam for external heat users, a valve III (43), a valve fourteen (54) and a valve fifteen (55) are opened, a valve VI (46) or a valve eight (48) is opened, high-pressure steam from a high-pressure superheater (505) enters a second pressure matcher (16), low-pressure steam extracted from a low-pressure cylinder (7) of a steam turbine or low-pressure steam supplemented by a low-pressure superheater (503) enters the second pressure matcher (16), medium-pressure steam is output after matching in the second pressure matcher (16), and then the steam is conveyed to a steam heat accumulator (17) for heat accumulation, so that the steam flow entering the steam turbine for doing work is reduced;
B. when the unit needs to increase the external output electric load, the steam heat accumulator (17) is utilized to replace the first pressure matcher (14) and the first temperature and pressure reducing device (15), and the steam heat is released through the steam heat accumulator (17) to supply steam for external heat users, so that the steam flow entering the steam turbine to do work is increased, and the specific operation is as follows:
closing the valve No. 47, the valve No. 49, the valve No. ten (50) and the valve No. eleven (51), wherein the first pressure matcher (14) does not work any more;
closing the twelve-valve (52) and the thirteenth-valve (53), and stopping the first temperature and pressure reducing device (15) from working;
closing the valve III (43), the valve VI (46), the valve VIII (48), the valve IV (54) and the valve fifteen (55), wherein the second pressure matcher (16) does not work any more;
at this time, a sixteen-number valve (56) is opened, and the steam heat accumulator (17) outputs steam for supplying steam to an external heat user.
6. The method of operating a coupled pressure matched combined cycle steam extraction and heat supply integrated system of claim 5, wherein:
when the unit is in a heat supply working condition and has power peak regulation requirement, the steam heat accumulator (17) also outputs steam, the steam is conveyed to the low-pressure cylinder (7) of the steam turbine after being subjected to temperature reduction and pressure reduction through the second temperature reduction and pressure reduction device (18), and the deoxidized steam of the deoxidizer (12) comes from the steam heat accumulator (17) and is used for increasing the steam flow entering the steam turbine for doing work.
7. The method of operating a coupled pressure matched combined cycle steam extraction and heat supply integrated system of claim 5, wherein:
when the unit is in a heat supply working condition and no power peak regulation requirement exists, the first pressure matcher (14) is preferentially selected to supply steam for external heat users, and the first temperature and pressure reduction device (15) is selected to supply steam for the external heat users;
when the unit is in a heat supply working condition and has power peak regulation requirements, the steam heat accumulator (17) is preferentially selected to supply steam to external heat users, the first pressure matcher (14) is selected to supply steam to the external heat users, and the first temperature and pressure reduction device (15) is selected to supply steam to the external heat users.
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| CN110631112B (en) * | 2019-09-11 | 2023-11-28 | 上海发电设备成套设计研究院有限责任公司 | Steam energy storage peak shaving system and method for heat supply unit |
| CN111255534B (en) * | 2020-03-31 | 2024-06-11 | 西安西热节能技术有限公司 | Steam storage peak regulation system and method applied to industrial steam supply system of coal-fired unit |
| CN111485961B (en) * | 2020-04-10 | 2024-09-03 | 中国能源建设集团浙江省电力设计院有限公司 | Gas-steam combined cycle thermodynamic system with steam extraction and backheating functions |
| CN112282874A (en) * | 2020-09-18 | 2021-01-29 | 华电电力科学研究院有限公司 | System for be used for improving industry heat supply flexibility |
| CN115341969B (en) * | 2022-07-05 | 2024-06-18 | 华能应城热电有限责任公司 | System and method for improving overall flexibility and economy of cogeneration power plant |
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