CN109869204B - Heat supply and power peak regulation coupling system for gas-steam combined cycle unit and operation method thereof - Google Patents
Heat supply and power peak regulation coupling system for gas-steam combined cycle unit and operation method thereof Download PDFInfo
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Abstract
The invention relates to a heat supply and power peak regulation coupling system for a gas-steam combined cycle unit and an operation method thereof, belonging to the technical field of improving the flexibility of a thermoelectric unit. 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 water supplementing pump, a shaft seal heater, a deaerator, a first temperature and pressure reduction device, an evaporation heat exchanger, a pressure matcher, a second temperature and pressure reduction device, a steam heat accumulator and a third temperature and pressure reduction device. By applying the invention, the working capacity loss in the heating process is effectively reduced while the external heat supply capacity of the combined cycle unit is deeply excavated; the current severe power peak shaving policy requirement is met, and the deep peak shaving capacity of the thermal power generating unit is realized.
Description
Technical Field
The invention belongs to the technical field of improving flexibility of a thermoelectric unit, and particularly relates to a heat supply and power peak regulation coupling system for 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 heat supply and power peak regulation coupling system for a gas-steam combined cycle unit and an operation method thereof, wherein the heat supply and power peak regulation coupling system is reasonable in design and reliable in performance.
The invention solves the problems by adopting the following technical scheme: a heating and power peak shaving coupling system for a gas and steam combined cycle unit, 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 water supplementing pump, a shaft seal heater, a deaerator, a first temperature and pressure reducing device, an evaporation heat exchanger, a pressure matcher, a second temperature and pressure reducing device, a steam heat accumulator and a third temperature and pressure reducing device, 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 connected with one end of a first preheating water supply branch pipe, the other end of the first preheating water supply branch pipe is simultaneously connected with a water inlet of the low-pressure steam drum and a water inlet of the high-pressure steam drum, the valve with nineteenth size is installed on the first preheating water supply branch pipe, the steam outlet of the low pressure steam drum is connected with the 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, the valve with second size is installed on 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, the valve with fifth size is installed on 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, the valve with seventh size is installed on 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, the valve with the valve is installed on the steam inlet of the low pressure cylinder of the steam turbine, the communicating pipe is connected with one end of a low-pressure steam pipe, an eleventh valve is arranged at one end of the low-pressure steam pipe, a steam outlet of the low-pressure superheater is connected with the other end of the low-pressure steam pipe, a tenth valve is arranged at the other end of the low-pressure steam pipe, a steam outlet of a low-pressure cylinder of the steam turbine is connected with a condenser, a water inlet end of a boiler water supply pipe is connected with the condenser, a water outlet end of the boiler water supply pipe is connected with a water inlet of a 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 flowing direction, the deaerator is connected with the low-pressure steam pipe through a deaerating steam extraction pipe, a twenty-fourth valve is arranged on the deaerating steam extraction pipe, a steam inlet end of a cold re-steam bypass is connected with the cold re-steam pipe, a steam outlet end of the cold re-steam bypass is connected with a steam inlet end of a medium-pressure industrial steam supply pipe, the cold re-steam bypass and the medium pressure industrial steam supply pipe are respectively provided with a valve No. six and a valve No. twenty-six, 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 outlet end of the cold re-steam bypass, the high pressure steam bypass is sequentially provided with a valve No. three, a first temperature and pressure reduction device and a valve No. four along the steam flow direction, the steam inlet end of the hot re-steam bypass is connected with the hot re-steam pipe, the steam outlet end of the hot re-steam bypass is connected with the steam outlet end of the cold re-steam bypass, the hot re-steam bypass is sequentially provided with a valve No. eight, an evaporation heat exchanger and a valve No. nine along the steam flow direction, the water inlet of the evaporation heat exchanger is connected with the water outlet of the flue gas preheater through a second preheating water supply branch pipe, the water inlet of the evaporation heat exchanger is provided with a valve No. twenty, the low-temperature steam outlet of the evaporation heat exchanger is connected with the steam inlet end of the low-pressure industrial steam supply pipe through a low-pressure steam regeneration pipe, twenty-first valves and twenty-fifth valves are respectively arranged on the low-pressure steam regeneration pipe and the low-pressure industrial steam supply pipe, the low-pressure steam inlet of the pressure matcher is connected with the low-pressure steam pipe through a low-pressure steam bypass, seventeen valves are arranged on the low-pressure steam bypass, the high-pressure steam inlet of the pressure matcher is connected with the steam outlet end of the cold-recovery steam bypass through a first medium-pressure steam branch pipe, twelve valves are arranged on the first medium-pressure steam branch pipe, the medium-pressure steam outlet of the pressure matcher is connected with the steam inlet end of the low-pressure industrial steam supply pipe, eighteen valves are arranged on the medium-pressure steam outlet of the pressure matcher, the steam inlet of the second temperature and pressure reducing device is connected with the steam outlet end of the cold-recovery steam pipe through a second medium-pressure steam branch pipe, thirteen valves are arranged on the second medium-pressure steam branch pipe, the outlet of the second temperature and pressure reducing device is connected with the steam outlet end of the cold recovery steam bypass through a second medium-pressure steam branch pipe, the sixteen valves are arranged on the heat accumulator, and the heat accumulator is connected with the steam outlet end of the medium-pressure accumulator at the steam outlet end of the medium-pressure steam bypass, and the heat accumulator is connected with the fifteenth valve.
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 peak regulating pipe, and a twenty-third valve, a third temperature and pressure reducing device and a twenty-second valve are sequentially arranged on the low-pressure steam peak regulating pipe along the steam flowing direction.
Further, the steam inlet end of the first medium-pressure steam branch pipe is connected with the steam outlet end of the high-pressure steam bypass, the steam outlet end of the cold re-steam bypass and the steam outlet end of the hot re-steam bypass at the same time.
Further, the steam inlet end of the second medium-pressure steam branch pipe is connected with the steam outlet end of the high-pressure steam bypass, the steam outlet end of the cold re-steam bypass and the steam outlet end of the hot re-steam bypass at the same time.
Further, the steam inlet end of the third medium-pressure steam branch pipe is connected with the steam outlet end of the high-pressure steam bypass, the steam outlet end of the cold re-steam bypass and the steam outlet end of the hot re-steam bypass at the same time.
Further, the steam inlet end of the medium-pressure industrial steam supply pipe is connected with the steam outlet end of the high-pressure steam bypass, the steam outlet end of the cold re-steam bypass and the steam outlet end of the hot re-steam bypass at the same time.
Furthermore, the steam turbine set can simultaneously provide high-parameter steam and low-parameter steam for different heat users, and the high-parameter steam and the low-parameter steam are respectively supplied to the outside through the medium-pressure industrial steam supply pipe and the low-pressure industrial steam supply pipe.
In the invention, the operation method of the heat supply and power peak regulation coupling system for the gas-steam combined cycle unit is as follows:
when the unit is in a heat supply working condition and has no peak shaving requirement, the operation method for providing low-parameter steam for heat users comprises the following two methods:
(A) Low parameter steam may be generated by the pressure matcher, operating as follows:
a seventeen valve is opened, a ten valve or an eleven valve is simultaneously opened, and low-pressure steam supplement from a low-pressure superheater or medium-pressure exhaust from a medium-pressure cylinder of the steam turbine is used as a low-pressure steam source of a pressure matcher; opening a twelve-valve, simultaneously opening a six-valve, or an eight-valve and a nine-valve, or a three-valve and a four-valve, and taking hot re-steam from a high-pressure exhaust steam or a reheater of a high-pressure cylinder of the steam turbine or main steam of the high-pressure superheater as a high-pressure steam source of a pressure matcher;
at the moment, an eighteen valve and a twenty-fifth valve are opened, high-pressure steam and low-pressure steam are generated after passing through a pressure matcher, and medium-pressure steam is supplied to the outside through a low-pressure industrial steam supply pipe;
At the moment, when the hot re-steam of the reheater is used as a high-pressure steam source of the pressure matcher, opening and adjusting the opening of a nineteenth valve and a twenty-first valve, conveying one part of boiler feed water heated by the flue gas preheater to a low-pressure steam drum and a high-pressure steam drum, conveying the other part of the boiler feed water to an evaporation heat exchanger to be heated to form new steam, opening a twenty-first valve, and conveying the new steam to a low-pressure industrial steam supply pipe through a low-pressure steam regeneration pipe;
at the moment, a valve I is opened, a water supplementing pump is started, and water is supplemented for a boiler water supply system through a boiler water supplementing pipe;
(B) Low parameter steam may also be generated by the second temperature and pressure reducing device, operating as follows:
the thirteenth valve is opened, the sixth valve, the eighth valve and the ninth valve, or the third valve and the fourth valve are simultaneously opened, hot re-steam from a high-pressure exhaust steam or a reheater of a high-pressure cylinder of the steam turbine or main steam of the high-pressure superheater is used as a high-pressure steam source of the second temperature and pressure reduction device, medium-pressure steam is generated after the high-pressure steam passes through the second temperature and pressure reduction device, and then the fourteenth valve and the twenty-fifth valve are opened and are externally supplied by a low-pressure industrial steam supply pipe;
at the moment, when the hot re-steam of the reheater is used as a high-pressure steam source of the second temperature and pressure reduction device, opening and adjusting the opening of a nineteenth valve and a twenty-first valve, conveying one part of boiler feed water heated by the flue gas preheater to a low-pressure steam drum and a high-pressure steam drum, conveying the other part of the boiler feed water to an evaporation heat exchanger to be heated to form new steam, opening a twenty-first valve, and conveying the new steam to a low-pressure industrial steam supply pipe by a low-pressure steam regeneration pipe;
At the moment, a valve I is opened, a water supplementing pump is started, and water is supplemented for a boiler water supply system through a boiler water supplementing pipe;
when the unit is in a heat supply working condition and has no peak shaving requirement, the operation method for providing high-parameter steam for heat users is as follows:
opening a valve No. six, or a valve No. eight and a valve No. nine, or a valve No. three and a valve No. four, and taking hot re-steam from a high-pressure exhaust steam or a reheater of a steam turbine or main steam of the high-pressure superheater as a high-parameter steam source, and opening a valve No. twenty-six at the moment, and supplying the steam from a medium-pressure industrial steam supply pipe to the outside;
at the moment, when the hot re-steam of the reheater is used as a high-parameter steam source, opening and adjusting the opening of a nineteenth valve and a twenty-first valve, conveying one part of boiler feed water heated by the flue gas preheater to a low-pressure steam drum and a high-pressure steam drum, conveying the other part of the boiler feed water to an evaporation heat exchanger to be heated to form new steam, opening the twenty-first valve, and conveying the new steam to a low-pressure industrial steam supply pipe through a low-pressure steam regeneration pipe;
at the moment, a valve I is opened, a water supplementing pump is started, and water is supplemented for a boiler water supply system through a boiler water supplementing pipe;
when the unit is in a heat supply working condition and has peak regulation requirements, the operation method of electric power peak regulation is as follows:
(A) If the combined cycle unit needs load reduction to match with power peak shaving, the operation is as follows:
closing a sixteen-valve, opening a fifteen-valve, and simultaneously opening a six-valve, or opening an eight-valve and a nine-valve, or opening a three-valve and a four-valve, wherein hot re-steam from a high-pressure exhaust steam or a reheater of a steam turbine or main steam of the high-pressure superheater is used as a heat storage steam source of a steam heat accumulator, and steam heat is stored through the steam heat accumulator, so that the steam flow entering the steam turbine is reduced, and the generated energy of the steam turbine is reduced;
at the moment, when the hot re-steam of the reheater is used as a heat storage steam source, opening and adjusting the opening of a nineteenth valve and a twenty-first valve, conveying one part of boiler feed water heated by the flue gas preheater to a low-pressure steam drum and a high-pressure steam drum, conveying the other part of the boiler feed water to an evaporation heat exchanger to be heated to form new steam, opening the twenty-first valve, and conveying the new steam to a low-pressure industrial steam supply pipe through a low-pressure steam regeneration pipe;
at the moment, a valve I is opened, a water supplementing pump is started, and water is supplemented for a boiler water supply system through a boiler water supplementing pipe;
(B) If the combined cycle unit needs to lift load to match with power peak shaving, the operation is as follows:
Closing the twelve valve, the thirteenth valve, the fourteen valve, the seventeen valve and the eighteen valve, and providing low-parameter steam for a heat user without using the pressure matcher and the second temperature and pressure reducing device; at the moment, the fifteenth valve is closed, the sixteen valve and the twenty-fifth valve are opened, and the steam heat is released through the steam heat accumulator to provide low-parameter steam for heat users, so that the steam flow entering the steam turbine is increased to improve the generating capacity of the steam turbine;
when the unit is in a pure condensation working condition and has peak regulation requirements, the operation method of electric power peak regulation is as follows:
closing the twelve-valve, the thirteenth-valve, the fourteen-valve, the seventeen-valve, the eighteen-valve, the twenty-five-valve and the twenty-six-valve, wherein the combined cycle unit does not supply heat to the outside;
(A) If the combined cycle unit needs load reduction to match with power peak shaving, the operation is as follows:
closing a sixteen-valve, opening a fifteen-valve, simultaneously opening a six-valve or a three-valve and a four-valve, and utilizing high-pressure exhaust steam from a high-pressure cylinder of the steam turbine or main steam of a high-pressure superheater as a heat storage steam source of a steam heat accumulator, and performing steam heat storage through the steam heat accumulator to reduce steam flow entering the steam turbine so as to reduce the generated energy of the steam turbine;
At the moment, a valve I is opened, a water supplementing pump is started, and water is supplemented for a boiler water supply system through a boiler water supplementing pipe;
(B) If the combined cycle unit needs to lift load to match with power peak shaving, the operation is as follows:
closing the fifteenth valve, and enabling the steam heat accumulator to not store steam; at the moment, sixteen valves, twenty-second valves and twenty-third valves are opened, steam heat release is carried out through the steam heat accumulator, and low-pressure steam supplementing flow entering the steam turbine is increased, so that the generated energy of the steam turbine is increased.
Further, in the above operation method of the heating and power peak shaving coupling system for the gas-steam combined cycle unit, the following steps are performed:
when the unit is in a heat supply working condition and has no peak regulation requirement, and low-parameter steam is provided for a heat user, the pressure matcher is preferentially selected to generate the low-parameter steam to supply heat to the outside, and the second temperature and pressure reduction device is selected to generate the low-parameter steam to supply heat to the outside; meanwhile, the high-pressure exhaust steam of the high-pressure cylinder of the steam turbine is preferentially selected as a high-parameter steam source, the hot re-steam of the reheater is selected as the high-parameter steam source, and the main steam of the high-pressure superheater is selected as the high-parameter steam source;
when the unit is in a heat supply working condition and has no peak regulation requirement, and high-pressure exhaust steam of a high-pressure cylinder of the steam turbine is preferentially selected as a high-parameter steam source when high-parameter steam is provided for a heat user, hot re-steam of a reheater is selected as the high-parameter steam source, and main steam of the high-pressure superheater is selected as the high-parameter steam source;
When the unit is in a heat supply working condition and has peak regulation requirements, if a steam heat accumulator is utilized to store steam, the high-pressure exhaust steam of a high-pressure cylinder of the steam turbine is preferentially selected as a heat storage steam source, the hot re-steam of a reheater is selected as the heat storage steam source, and finally the main steam of the high-pressure superheater is selected as the heat storage steam source; if the steam heat accumulator is utilized to release heat of steam, the operation of the second temperature and pressure reduction device is stopped preferentially, and then the operation of the pressure matcher is stopped;
when the unit is in a pure condensation working condition and has peak regulation requirements, if the steam heat storage is carried out by utilizing the steam heat accumulator, the high-pressure exhaust steam of the high-pressure cylinder of the steam turbine is preferentially selected as a heat storage steam source, and the main steam of the high-pressure superheater is selected as the heat storage steam source.
Compared with the prior art, the invention has the following advantages and effects: the combined cycle unit thermal decoupling device has the advantages of simple structure, reasonable design and reliable performance, and is based on the energy cascade utilization principle to carry out integrated design of different steam extraction modes, so that the thermal decoupling operation capability of the combined cycle unit is effectively improved; and meanwhile, the steam heat accumulator is utilized to realize the cooperative matching of the power peak regulation and heat supply of the combined cycle unit, and the power peak regulation capacity of the combined cycle unit is deeply excavated. 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 shaving policy requirement is met, the deep peak shaving capacity of the thermal power unit is realized, the power grid peak shaving requirement on the unit is practically met, and the thermal power 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, a heating and power peak shaving coupling system for 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 21, 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 water supplementing pump 12, a shaft seal heater 13, a deaerator 14, a first temperature and pressure reducing device 15, an evaporation heat exchanger 16, a pressure matcher 17, a second temperature and pressure reducing device 18, a steam heat accumulator 19 and a third temperature and pressure reducing device 20, the steam turbine high pressure cylinder 6, the steam turbine medium pressure cylinder 7 and the steam turbine low pressure cylinder 8 are coaxially connected and drive the second generator 9 to generate electricity, the waste heat boiler 5 comprises a flue gas preheater 501, a low pressure steam drum 502, a low pressure superheater 503, a high pressure steam drum 504, a reheater 505 and a high pressure superheater 506, a water outlet of the flue gas preheater 501 is connected with one end of a first preheating water supply branch pipe 36, the other end of the first preheating water supply branch pipe 36 is connected with the water inlet of the low pressure steam drum 502 and the water inlet of the high pressure steam drum 504 at the same time, a nineteenth valve 70 is arranged on the first preheating water supply branch pipe 36, the steam outlet of the low pressure steam drum 502 is connected with the steam inlet of the low pressure superheater 503, the steam outlet of the high pressure steam drum 504 is connected with the steam inlet of the high pressure superheater 506, the steam inlet of the turbine high pressure cylinder 6 is connected with the steam outlet of the high pressure superheater 506 through the high pressure steam pipe 24, a second valve 52 is arranged at the steam inlet of the turbine high pressure cylinder 6, the steam outlet of the turbine high pressure cylinder 6 is connected with the steam inlet of the reheater 505 through the cold rebeamer 25, a fifth valve 55 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 turbine medium pressure cylinder 7 through the hot rebeamer 26, a seventh valve 57 is arranged at the steam inlet of the turbine medium pressure cylinder 7, the steam outlet of the middle 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 27, a hydraulic butterfly valve 62 is arranged at the steam inlet of the low pressure cylinder 8 of the steam turbine, the communicating pipe 27 is connected with one end of a low pressure steam pipe 28, an eleven valve 61 is arranged at one end of the low pressure steam pipe 28, the steam outlet of a low pressure superheater 503 is connected with the other end of the low pressure steam pipe 28, a ten valve 60 is arranged at the other end of the low pressure steam pipe 28, the steam outlet of the low pressure cylinder 8 of the steam turbine is connected with a condenser 10, the water inlet end of a boiler feed pipe 22 is connected with the condenser 10, the water outlet end of the boiler feed pipe 22 is connected with the water inlet of a flue gas preheater 501, a condensate pump 11, a shaft seal heater 13 and a deaerator 14 are sequentially arranged on the boiler feed pipe 22 along the water flow direction, the deaerator 14 is connected with the low pressure steam pipe 28 through a deaerator extraction pipe 40, a twenty-fourth valve 75 is installed on the deoxidizing steam extraction pipe 40, the steam inlet end of the cold re-steam bypass 30 is connected with the cold re-steam pipe 25, the steam outlet end of the cold re-steam bypass 30 is connected with the steam inlet end of the medium pressure industrial steam supply pipe 42, a sixth valve 56 and a twenty-sixth valve 77 are installed on the cold re-steam bypass 30 and the medium pressure industrial steam supply pipe 42 respectively, the steam inlet end of the high pressure steam bypass 29 is connected with the high pressure steam pipe 24, the steam outlet end of the high pressure steam bypass 29 is connected with the steam outlet end of the cold re-steam bypass 30, a third valve 53, a first temperature and pressure reducing device 15 and a fourth valve 54 are installed on the high pressure steam bypass 29 in sequence along the steam flow direction, the steam inlet end of the hot re-steam bypass 31 is connected with the hot re-steam pipe 26, the steam outlet end of the hot re-steam bypass 31 is connected with the steam outlet end of the cold re-steam bypass 30, and a valve No. eight 58, an evaporation heat exchanger 16 and a valve No. nine 59 are sequentially arranged on the hot re-steam bypass 31 along the steam flow direction, a water supply inlet of the evaporation heat exchanger 16 is connected with a water outlet of the flue gas preheater 501 through a second preheating water supply branch pipe 37, a valve No. twenty 71 is arranged on the second preheating water supply branch pipe 37, a low-temperature steam outlet of the evaporation heat exchanger 16 is connected with a steam inlet end of a low-pressure industrial steam supply pipe 41 through a low-pressure steam regeneration pipe 38, a valve No. twenty-one 72 and a valve No. twenty-five 76 are respectively arranged on the low-pressure steam regeneration pipe 38 and the low-pressure industrial steam supply pipe 41, a low-pressure steam inlet of the pressure matcher 17 is connected with the low-pressure steam pipe 28 through a low-pressure steam bypass 35, a valve No. seventeen 68 is arranged on the low-pressure steam bypass 35, a high-pressure steam inlet of the pressure matcher 17 is connected with a steam outlet end of the cold re-steam bypass 30 through a first medium-pressure steam branch pipe 32, a twelve-valve 63 is installed on the first medium-pressure steam branch pipe 32, a medium-pressure steam outlet of the pressure matcher 17 is connected with a steam inlet end of a low-pressure industrial steam supply pipe 41, an eighteen-valve 69 is installed at the medium-pressure steam outlet of the pressure matcher 17, a steam inlet of the second temperature and pressure reducing device 18 is connected with a steam outlet end of the cold re-steam bypass 30 through the second medium-pressure steam branch pipe 33, a thirteenth-valve 64 is installed on the second medium-pressure steam branch pipe 33, a steam outlet of the second temperature and pressure reducing device 18 is connected with a steam inlet end of the low-pressure industrial steam supply pipe 41, a fourteen-valve 65 is installed at a steam outlet of the second temperature and pressure reducing device 18, a steam inlet of the steam heat accumulator 19 is connected with a steam outlet end of the cold re-steam bypass 30 through the third medium-pressure steam branch pipe 34, and a fifteen-valve 66 is installed on the third medium-pressure steam branch pipe 34, the steam outlet of the steam heat accumulator 19 is connected with the steam inlet end of the low-pressure industrial steam supply pipe 41, and a sixteen-number valve 67 is arranged at the steam outlet of the steam heat accumulator 19.
In this embodiment, the boiler water replenishing pipe 23 is connected to the water outlet of the condensate pump 11, and the water replenishing pump 12 and the valve 51 are sequentially installed on the boiler water replenishing pipe 23 along the water flowing direction.
In this embodiment, the steam outlet of the steam heat accumulator 19 is further connected to the low pressure steam pipe 28 through a low pressure steam peak shaver tube 39, and a twenty-third valve 74, a third temperature and pressure reducing device 20 and a twenty-second valve 73 are sequentially installed on the low pressure steam peak shaver tube 39 along the steam flow direction.
In this embodiment, the steam inlet ends of the first medium pressure steam branch pipe 32, the second medium pressure steam branch pipe 33, the third medium pressure steam branch pipe 34 and the medium pressure industrial steam supply pipe 42 are all connected to the steam outlet end of the high pressure steam bypass 29, the steam outlet end of the cold re-steam bypass 30 and the steam outlet end of the hot re-steam bypass 31 at the same time.
In this embodiment, the steam turbine set may provide high-parameter steam and low-parameter steam for different heat users simultaneously, and the high-parameter steam and the low-parameter steam are respectively supplied to the outside through the medium-pressure industrial steam supply pipe 42 and the low-pressure industrial steam supply pipe 41.
The operation method of the heat supply and power peak regulation coupling system for the gas-steam combined cycle unit is as follows:
when the unit is in a heat supply working condition and has no peak shaving requirement, the operation method for providing low-parameter steam for heat users comprises the following two methods:
(A) Low parameter steam may be generated by the pressure matcher 17, as follows:
a seventeen valve 68 is opened, a ten valve 60 or an eleven valve 61 is simultaneously opened, and low-pressure steam supplement from the low-pressure superheater 503 or medium-pressure exhaust from the turbine medium-pressure cylinder 7 is used as a low-pressure steam source of the pressure matcher 17; opening a twelve-valve 63, simultaneously opening a six-valve 56, or an eight-valve 58 and a nine-valve 59, or a three-valve 53 and a four-valve 54, and taking hot re-steam from a high-pressure exhaust steam or reheater 505 of a high-pressure cylinder 6 of the steam turbine or main steam of a high-pressure superheater 506 as a high-pressure steam source of the pressure matcher 17;
at this time, the eighteen valve 69 and the twenty-fifth valve 76 are opened, and the high-pressure steam and the low-pressure steam pass through the pressure matcher 17 to generate medium-pressure steam, which is externally supplied from the low-pressure industrial steam supply pipe 41;
at this time, when the hot re-steam of the reheater 505 is used as the high-pressure steam source of the pressure matcher 17, opening and adjusting the openings of the nineteenth valve 70 and the twenty-first valve 71, one part of the boiler feed water heated by the flue gas preheater 501 is delivered to the low-pressure steam drum 502 and the high-pressure steam drum 504, the other part is delivered to the evaporation heat exchanger 16 to be heated into new steam, then the twenty-first valve 72 is opened, and the new steam is delivered to the low-pressure industrial steam supply pipe 41 from the low-pressure steam regeneration pipe 38;
At this time, valve number one 51 is opened, the water replenishing pump 12 is started, and water is replenished to the boiler water supply system through the boiler water replenishing pipe 23;
(B) Low parameter steam may also be generated by the second attemperation and depressurization device 18 as follows:
the thirteenth valve 64 is opened, the sixth valve 56, the eighth valve 58 and the ninth valve 59, the third valve 53 and the fourth valve 54 are simultaneously opened, hot re-steam from the high-pressure exhaust steam of the high-pressure cylinder 6 of the steam turbine or the reheater 505 or main steam of the high-pressure superheater 506 is used as a high-pressure steam source of the second temperature and pressure reduction device 18, the high-pressure steam passes through the second temperature and pressure reduction device 18 to generate medium-pressure steam, then the fourteenth valve 65 and the twenty-fifth valve 76 are opened, and the medium-pressure steam is externally supplied by the low-pressure industrial steam supply pipe 41;
at this time, when the hot re-steam of the reheater 505 is used as the high-pressure steam source of the second temperature and pressure reduction device 18, opening and adjusting the opening of the nineteenth valve 70 and the twenty-first valve 71, one part of the boiler feed water heated by the flue gas preheater 501 is delivered to the low-pressure steam drum 502 and the high-pressure steam drum 504, the other part is delivered to the evaporation heat exchanger 16 to be heated into new steam, then the twenty-first valve 72 is opened, and the new steam is delivered to the low-pressure industrial steam supply pipe 41 from the low-pressure steam regeneration pipe 38;
At this time, valve number one 51 is opened, the water replenishing pump 12 is started, and water is replenished to the boiler water supply system through the boiler water replenishing pipe 23;
when the unit is in a heat supply working condition and has no peak shaving requirement, the operation method for providing high-parameter steam for heat users is as follows:
opening valve number six 56, valve number eight 58 and valve number nine 59, valve number three 53 and valve number four 54, utilizing the hot re-steam from the high pressure exhaust steam or reheater 505 of the turbine high pressure cylinder 6 or the main steam of the high pressure superheater 506 as a source of high parameter steam, opening valve number twenty-six 77 at this time, and externally supplying from the medium pressure industrial steam supply pipe 42;
at this time, when the hot re-steam of the reheater 505 is used as a high-parameter steam source, opening and adjusting the opening of the nineteenth valve 70 and the twenty-first valve 71, one part of the boiler feed water heated by the flue gas preheater 501 is delivered to the low-pressure steam drum 502 and the high-pressure steam drum 504, the other part is delivered to the evaporation heat exchanger 16 to be heated into new steam, then the twenty-first valve 72 is opened, and the new steam is delivered to the low-pressure industrial steam supply pipe 41 from the low-pressure steam regeneration pipe 38;
at this time, valve number one 51 is opened, the water replenishing pump 12 is started, and water is replenished to the boiler water supply system through the boiler water replenishing pipe 23;
When the unit is in a heat supply working condition and has peak regulation requirements, the operation method of electric power peak regulation is as follows:
(A) If the combined cycle unit needs load reduction to match with power peak shaving, the operation is as follows:
closing a sixteen-valve 67, opening a fifteenth-valve 66, simultaneously opening a six-valve 56, or an eight-valve 58 and a nine-valve 59, or a three-valve 53 and a four-valve 54, and utilizing hot re-steam from a high-pressure steam exhaust or reheater 505 of a high-pressure cylinder 6 of a steam turbine or main steam of a high-pressure superheater 506 as a heat storage steam source of a steam heat accumulator 19, performing steam heat storage through the steam heat accumulator 19, reducing steam flow entering the steam turbine, thereby reducing the generated energy of the steam turbine;
at this time, when the hot re-steam of the reheater 505 is used as a heat storage steam source, opening and adjusting the opening of the nineteenth valve 70 and the twenty-first valve 71, one part of the boiler feed water heated by the flue gas preheater 501 is delivered to the low-pressure steam drum 502 and the high-pressure steam drum 504, the other part is delivered to the evaporation heat exchanger 16 to be heated into new steam, then the twenty-first valve 72 is opened, and the new steam is delivered to the low-pressure industrial steam supply pipe 41 from the low-pressure steam regeneration pipe 38;
at this time, valve number one 51 is opened, the water replenishing pump 12 is started, and water is replenished to the boiler water supply system through the boiler water replenishing pipe 23;
(B) If the combined cycle unit needs to lift load to match with power peak shaving, the operation is as follows:
closing the twelve valve 63, the thirteenth valve 64, the fourteen valve 65, the seventeen valve 68 and the eighteen valve 69, and not using the pressure matcher 17 and the second temperature and pressure reducing device 18 to provide low-parameter steam for the heat user; at this time, the fifteenth valve 66 is closed, the sixteen valve 67 and the twenty-fifth valve 76 are opened, and the steam heat is released through the steam heat accumulator 19 to provide low-parameter steam for a heat user, so that the steam flow entering the steam turbine is increased to improve the power generation of the steam turbine;
when the unit is in a pure condensation working condition and has peak regulation requirements, the operation method of electric power peak regulation is as follows:
closing the twelve valve 63, the thirteenth valve 64, the fourteen valve 65, the seventeen valve 68, the eighteen valve 69, the twenty-five valve 76 and the twenty-six valve 77, wherein the combined cycle unit does not supply heat to the outside;
(A) If the combined cycle unit needs load reduction to match with power peak shaving, the operation is as follows:
closing a sixteen-number valve 67, opening a fifteen-number valve 66, simultaneously opening a six-number valve 56 or a three-number valve 53 and a four-number valve 54, and utilizing the high-pressure exhaust steam from the high-pressure cylinder 6 of the steam turbine or main steam of the high-pressure superheater 506 as a heat storage steam source of the steam heat accumulator 19, and performing steam heat storage through the steam heat accumulator 19 to reduce the steam flow entering the steam turbine so as to reduce the generated energy of the steam turbine;
At this time, valve number one 51 is opened, the water replenishing pump 12 is started, and water is replenished to the boiler water supply system through the boiler water replenishing pipe 23;
(B) If the combined cycle unit needs to lift load to match with power peak shaving, the operation is as follows:
closing the fifteenth valve 66, the steam heat accumulator 19 does not perform steam heat accumulation any more; at this time, the sixteen valve 67, the twenty-second valve 73 and the twenty-third valve 74 are opened, and the heat release of the steam is performed by the steam accumulator 19, so that the low-pressure steam supplementing flow rate into the steam turbine is increased, and the power generation of the steam turbine is increased.
In the operation method of the heat supply and power peak regulation coupling system for the gas-steam combined cycle unit, the power supply and power peak regulation coupling system comprises the following steps:
when the unit is in a heat supply working condition and has no peak regulation requirement, and low-parameter steam is provided for a heat user, the pressure matcher 17 is preferentially selected to generate the low-parameter steam to supply heat to the outside, and the second temperature and pressure reduction device 18 is selected to generate the low-parameter steam to supply heat to the outside; meanwhile, the high-pressure exhaust steam of the high-pressure cylinder 6 of the steam turbine is preferentially selected as a high-parameter steam source, the hot re-steam of the reheater 505 is selected as the high-parameter steam source, and the main steam of the high-pressure superheater 506 is selected as the high-parameter steam source;
When the unit is in a heat supply working condition and has no peak regulation requirement, and high-parameter steam is provided for a heat user, the high-pressure exhaust steam of the high-pressure cylinder 6 of the steam turbine is preferentially selected as a high-parameter steam source, the hot re-steam of the reheater 505 is selected as the high-parameter steam source, and finally the main steam of the high-pressure superheater 506 is selected as the high-parameter steam source;
when the unit is in a heat supply working condition and has peak regulation requirements, if the steam heat storage device 19 is utilized to store steam, the high-pressure exhaust steam of the high-pressure cylinder 6 of the steam turbine is preferentially selected as a heat storage steam source, the hot re-steam of the reheater 505 is selected as the heat storage steam source, and finally the main steam of the high-pressure superheater 506 is selected as the heat storage steam source; if the steam heat is released by the steam heat accumulator 19, the operation of the second temperature and pressure reduction device 18 is preferentially stopped, and then the operation of the pressure matcher 17 is stopped;
when the unit is in the pure condensation condition and has peak regulation requirements, if the steam heat storage device 19 is utilized to store steam, the high-pressure exhaust steam of the high-pressure cylinder 6 of the steam turbine is preferentially selected as a heat storage steam source, and the main steam of the high-pressure superheater 506 is selected as the heat storage steam source.
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 shut-off function in addition to the hydraulic butterfly valve 62.
In the specific operation method of the embodiment, during the heat supply working condition, the opening degree adjustment of all valves is completed through the remote operation of the DCS control system of the combined cycle unit; in addition, the water supplementing flow of the boiler water supply system of the combined cycle unit is determined by the steam flow for external heat supply and the steam flow for heat accumulation and release by the steam heat accumulator 19.
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 (8)
1. A heating and power peak shaving coupling system for a gas and steam combined cycle unit, 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 (21), 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 water supplementing pump (12), a shaft seal heater (13), a deaerator (14), a first temperature and pressure reducing device (15), an evaporation heat exchanger (16), a pressure matcher (17), a second temperature and pressure reducing device (18), a steam heat accumulator (19) and a third temperature and pressure reducing device (20), 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 flue gas preheater (501) is connected with one end of a preheating branch pipe (36), the other end of the first branch pipe (36) is simultaneously connected with a water inlet (70) of the low-pressure drum (502) and a water inlet (70) of the high-pressure drum (70), the steam outlet of the low-pressure steam drum (502) is connected with the steam inlet of the low-pressure superheater (503), the steam outlet of the high-pressure steam drum (504) is connected with the steam inlet of the high-pressure superheater (506), the steam inlet of the turbine high-pressure cylinder (6) is connected with the steam outlet of the high-pressure superheater (506) through the high-pressure steam pipe (24), a valve II (52) is arranged at the steam inlet of the turbine high-pressure cylinder (6), the steam outlet of the turbine high-pressure cylinder (6) is connected with the steam inlet of the reheater (505) through a cold reheat pipe (25), a valve V (55) 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 turbine medium-pressure cylinder (7) through the hot reheat pipe (26), a valve V (57) is arranged at the steam inlet of the turbine medium-pressure cylinder (7), a valve II (52) is arranged at the steam inlet of the low-pressure cylinder (27), a communication pipe (28) is arranged at the other end of the low-pressure cylinder (28), an inlet of the low-pressure pipe (28) is connected with the low-pressure cylinder (28), a communication pipe (28) is arranged at the other end of the low-pressure cylinder (28), and the communication pipe (28) is connected with the high-pressure valve II (28), and install ten numbers valve (60) at the other end of low pressure steam pipe (28), the exhaust port and the condenser (10) of steam turbine low pressure cylinder (8) are connected, and the water inlet of boiler feed pipe (22) is connected with condenser (10), the water outlet of boiler feed pipe (22) is connected with the water inlet of flue gas preheater (501), and install condensate pump (11), bearing seal heater (13) and deaerator (14) in proper order along the water flow direction on boiler feed pipe (22), deaerator (14) are connected with low pressure steam pipe (28) through deaeration extraction pipe (40), and install twenty-four number valve (75) on deaeration extraction pipe (40), the steam inlet of cold re-steam bypass (30) is connected with cold re-steam pipe (25), the steam outlet of cold re-steam bypass (30) is connected with the steam inlet of medium pressure steam supply pipe (42), and install six numbers valve (56) on cold re-steam bypass (30) in proper order along the water flow direction, install sixteen valve (29) and install in proper order along the high pressure steam outlet of high pressure bypass (29) and high pressure steam outlet (29) and high pressure bypass (29) and high pressure steam outlet end along the high pressure steam bypass (29) and the high pressure side (29) of the bypass (29) and the high pressure steam pipe The first temperature and pressure reducing device (15) and a fourth valve (54), the steam inlet end of the hot re-steam bypass (31) is connected with the hot re-steam pipe (26), the steam outlet end of the hot re-steam bypass (31) is connected with the steam outlet end of the cold re-steam bypass (30), a eighth valve (58), an evaporating heat exchanger (16) and a ninth valve (59) are sequentially arranged on the hot re-steam bypass (31) along the steam flowing direction, the water inlet of the evaporating heat exchanger (16) is connected with the water outlet of the flue gas preheater (501) through a second preheating water supply branch pipe (37), a twenty-first valve (71) is arranged on the second preheating water supply branch pipe (37), the low-temperature steam outlet of the evaporating heat exchanger (16) is connected with the steam inlet end of the low-pressure industrial steam supply pipe (41) through a low-pressure steam regeneration pipe (38), a twenty-first valve (72) is arranged on the low-pressure industrial steam supply pipe (41), a twenty-fifth valve (76) is arranged on the low-pressure industrial steam bypass (41), the low-temperature steam outlet of the evaporating heat exchanger (16) is connected with the low-pressure steam outlet end of the low-pressure steam bypass (35) through the low-pressure steam regeneration pipe (38) through the low-pressure steam matcher (35) and the high-pressure steam matcher (30), a twelve-valve (63) is arranged on the first medium-pressure steam branch pipe (32), a medium-pressure steam outlet of the pressure matcher (17) is connected with a steam inlet end of a low-pressure industrial steam supply pipe (41), a eighteen-valve (69) is arranged at the medium-pressure steam outlet of the pressure matcher (17), a steam inlet of the second temperature and pressure reducing device (18) is connected with a steam outlet end of the cold re-steam bypass (30) through the second medium-pressure steam branch pipe (33), a thirteen-valve (64) is arranged on the second medium-pressure steam branch pipe (33), a steam outlet of the second temperature and pressure reducing device (18) is connected with a steam inlet end of a low-pressure industrial steam supply pipe (41), a fourteen-valve (65) is arranged at a steam outlet of the second temperature and pressure reducing device (18), a steam inlet of the steam accumulator (19) is connected with a steam outlet end of the cold re-steam bypass (30) through the third medium-pressure steam branch pipe (34), a fifteen-valve (64) is arranged on the second medium-pressure steam branch pipe (33), and the steam inlet of the steam accumulator (19) is connected with the steam inlet end of the low-pressure industrial steam supply pipe (41); the boiler water supplementing pipe (23) is connected with a water outlet of the condensate pump (11), and the water supplementing pump (12) and the first valve (51) are sequentially arranged on the boiler water supplementing pipe (23) along the water flowing direction; the steam outlet of the steam heat accumulator (19) is also connected with a low-pressure steam pipe (28) through a low-pressure steam peak regulating pipe (39), and a twenty-third valve (74), a third temperature and pressure reducing device (20) and a twenty-second valve (73) are sequentially arranged on the low-pressure steam peak regulating pipe (39) along the steam flowing direction.
2. The heat and power peak shaving coupling system for a gas-steam combined cycle unit according to claim 1, wherein the steam inlet end of the first medium pressure steam branch pipe (32) is connected with the steam outlet end of the high pressure steam bypass (29), the steam outlet end of the cold re-steam bypass (30) and the steam outlet end of the hot re-steam bypass (31) simultaneously.
3. The heat and power peak shaving coupling system for a gas-steam combined cycle unit according to claim 1, wherein the steam inlet end of the second medium pressure steam branch pipe (33) is connected with the steam outlet end of the high pressure steam bypass (29), the steam outlet end of the cold re-steam bypass (30) and the steam outlet end of the hot re-steam bypass (31) simultaneously.
4. The heat and power peak shaving coupling system for a gas-steam combined cycle unit according to claim 1, wherein the steam inlet end of the third medium pressure steam branch pipe (34) is connected with the steam outlet end of the high pressure steam bypass (29), the steam outlet end of the cold re-steam bypass (30) and the steam outlet end of the hot re-steam bypass (31) simultaneously.
5. The heat and power peak shaving coupling system for a gas-steam combined cycle unit according to claim 1, wherein the steam inlet end of the medium pressure industrial steam supply pipe (42) is connected with the steam outlet end of the high pressure steam bypass (29), the steam outlet end of the cold re-steam bypass (30) and the steam outlet end of the hot re-steam bypass (31) simultaneously.
6. The heat and power peak shaving coupling system for a gas and steam combined cycle unit according to claim 1, wherein the steam turbine unit simultaneously provides high-parameter steam and low-parameter steam for different heat users, the high-parameter steam is externally supplied through a medium-pressure industrial steam supply pipe (42), and the low-parameter steam is externally supplied through a low-pressure industrial steam supply pipe (41).
7. A method of operating a heating and power peak shaver coupling system for a gas-steam combined cycle unit according to any one of claims 1 to 6, wherein the method of operation is as follows:
when the unit is in a heat supply working condition and has no peak shaving requirement, the operation method for providing low-parameter steam for heat users comprises the following two methods:
(A) The low parameter steam is generated by the pressure matcher (17) and operates as follows:
a seventeen valve (68) is opened, a ten valve (60) or an eleven valve (61) is simultaneously opened, and low-pressure steam supplement from a low-pressure superheater (503) or medium-pressure exhaust from a steam turbine medium-pressure cylinder (7) is used as a low-pressure steam source of a pressure matcher (17); opening a twelve-valve (63), simultaneously opening a six-valve (56) or a eight-valve (58) and a nine-valve (59) or a three-valve (53) and a four-valve (54), and taking hot re-steam from a high-pressure exhaust steam or reheater (505) of a high-pressure cylinder (6) of a steam turbine or main steam of a high-pressure superheater (506) as a high-pressure steam source of a pressure matcher (17);
At the moment, an eighteen valve (69) and a twenty-fifth valve (76) are opened, high-pressure steam and low-pressure steam are generated after passing through a pressure matcher (17) and then are externally supplied by a low-pressure industrial steam supply pipe (41);
at this time, when the hot re-steam of the reheater (505) is used as a high-pressure steam source of the pressure matcher (17), opening and adjusting the opening of a nineteenth valve (70) and a twenty-first valve (71), conveying one part of boiler feed water heated by the flue gas preheater (501) to a low-pressure steam drum (502) and a high-pressure steam drum (504), conveying the other part of the boiler feed water to the evaporation heat exchanger (16) to be heated into new steam, opening a twenty-first valve (72), and conveying the new steam to a low-pressure industrial steam supply pipe (41) through a low-pressure steam regeneration pipe (38);
at the moment, a valve I (51) is opened, a water supplementing pump (12) is started, and water is supplemented for a boiler water supply system through a boiler water supplementing pipe (23);
(B) Generating low parameter steam by a second temperature and pressure reducing device (18) operates as follows:
a thirteenth valve (64) is opened, a sixth valve (56), a eighth valve (58) and a ninth valve (59), a third valve (53) and a fourth valve (54) are simultaneously opened, hot re-steam from a high-pressure exhaust steam or reheater (505) of a high-pressure cylinder (6) of a steam turbine or main steam of a high-pressure superheater (506) is used as a high-pressure steam source of a second temperature and pressure reducing device (18), medium-pressure steam is generated after the high-pressure steam passes through the second temperature and pressure reducing device (18), and then a fourteenth valve (65) and a twenty-fifth valve (76) are opened, and the low-pressure industrial steam supply pipe (41) supplies the steam to the outside;
At this time, when the hot re-steam of the reheater (505) is used as a high-pressure steam source of the second temperature and pressure reduction device (18), opening and adjusting the opening of a nineteenth valve (70) and a twenty-first valve (71), conveying one part of boiler feed water heated by the flue gas preheater (501) to a low-pressure steam drum (502) and a high-pressure steam drum (504), conveying the other part of the boiler feed water to the evaporation heat exchanger (16) to be heated to form new steam, opening a twenty-first valve (72), and conveying the new steam to a low-pressure industrial steam supply pipe (41) through a low-pressure steam regeneration pipe (38);
at the moment, a valve I (51) is opened, a water supplementing pump (12) is started, and water is supplemented for a boiler water supply system through a boiler water supplementing pipe (23);
when the unit is in a heat supply working condition and has no peak shaving requirement, the operation method for providing high-parameter steam for heat users is as follows:
opening a valve No. six (56), a valve No. eight (58) and a valve No. nine (59), a valve No. three (53) and a valve No. four (54), and taking hot re-steam from a high-pressure exhaust steam or reheater (505) of a high-pressure cylinder (6) of the steam turbine or main steam of a high-pressure superheater (506) as a high-parameter steam source, opening a valve No. twenty-six (77) at the moment, and externally supplying the steam from a medium-pressure industrial steam supply pipe (42);
At this time, when the hot re-steam of the reheater (505) is used as a high-parameter steam source, opening and adjusting the opening of a nineteenth valve (70) and a twenty-first valve (71), conveying one part of the boiler feed water heated by the flue gas preheater (501) to a low-pressure steam drum (502) and a high-pressure steam drum (504), conveying the other part of the boiler feed water to the evaporation heat exchanger (16) to be heated into new steam, opening a twenty-first valve (72), and conveying the new steam from the low-pressure steam regeneration pipe (38) to the low-pressure industrial steam supply pipe (41);
at the moment, a valve I (51) is opened, a water supplementing pump (12) is started, and water is supplemented for a boiler water supply system through a boiler water supplementing pipe (23);
when the unit is in a heat supply working condition and has peak regulation requirements, the operation method of electric power peak regulation is as follows:
(A) If the combined cycle unit needs load reduction to match with power peak shaving, the operation is as follows:
closing a sixteen-valve (67), opening a fifteen-valve (66), simultaneously opening a six-valve (56) or an eight-valve (58) and a nine-valve (59) or a three-valve (53) and a four-valve (54), and using hot re-steam from a high-pressure exhaust steam or reheater (505) of a high-pressure cylinder (6) of a steam turbine or main steam of a high-pressure superheater (506) as a heat storage steam source of a steam heat accumulator (19), and performing steam heat storage through the steam heat accumulator (19) to reduce steam flow entering the steam turbine so as to reduce the generated energy of the steam turbine;
At this time, when the hot re-steam of the reheater (505) is used as a heat storage steam source, opening and adjusting the opening of a nineteenth valve (70) and a twenty-first valve (71), conveying one part of the boiler feed water heated by the flue gas preheater (501) to a low-pressure steam drum (502) and a high-pressure steam drum (504), conveying the other part of the boiler feed water to the evaporation heat exchanger (16) to be heated into new steam, opening a twenty-first valve (72), and conveying the new steam to a low-pressure industrial steam supply pipe (41) through a low-pressure steam regeneration pipe (38);
at the moment, a valve I (51) is opened, a water supplementing pump (12) is started, and water is supplemented for a boiler water supply system through a boiler water supplementing pipe (23);
(B) If the combined cycle unit needs to lift load to match with power peak shaving, the operation is as follows:
closing the twelve-valve (63), the thirteenth-valve (64), the fourteen-valve (65), the seventeen-valve (68) and the eighteen-valve (69), and not using the pressure matcher (17) and the second temperature and pressure reducing device (18) to provide low-parameter steam for a heat user; at the moment, the fifteenth valve (66) is closed, the sixteen valve (67) and the twenty-fifth valve (76) are opened, and the steam heat is released through the steam heat accumulator (19) to provide low-parameter steam for a heat user, so that the steam flow entering the steam turbine is increased to improve the generated energy of the steam turbine;
When the unit is in a pure condensation working condition and has peak regulation requirements, the operation method of electric power peak regulation is as follows:
closing the twelve-valve (63), the thirteenth-valve (64), the fourteen-valve (65), the seventeen-valve (68), the eighteen-valve (69), the twenty-five-valve (76) and the twenty-six-valve (77), wherein the combined cycle unit does not supply heat to the outside;
(A) If the combined cycle unit needs load reduction to match with power peak shaving, the operation is as follows:
closing a sixteen-number valve (67), opening a fifteen-number valve (66), simultaneously opening a six-number valve (56) or a three-number valve (53) and a four-number valve (54), and reducing the steam flow entering the steam turbine by using main steam from a high-pressure exhaust steam or a high-pressure superheater (506) of the high-pressure cylinder (6) of the steam turbine as a heat storage steam source of the steam heat accumulator (19) and performing steam heat storage through the steam heat accumulator (19), so as to reduce the generated energy of the steam turbine;
at the moment, a valve I (51) is opened, a water supplementing pump (12) is started, and water is supplemented for a boiler water supply system through a boiler water supplementing pipe (23);
(B) If the combined cycle unit needs to lift load to match with power peak shaving, the operation is as follows:
Closing the fifteenth valve (66), and enabling the steam heat accumulator (19) to not store steam; at this time, sixteen-valve (67), twenty-second-valve (73) and twenty-third-valve (74) are opened, steam heat release is performed through the steam heat accumulator (19), and the low-pressure steam supplementing flow entering the steam turbine is increased, so that the power generation amount of the steam turbine is increased.
8. The method of operating a heating and power peaking coupling system for a gas and steam combined cycle unit of claim 7, wherein:
when the unit is in a heat supply working condition and has no peak regulation requirement, and low-parameter steam is provided for a heat user, the pressure matcher (17) is preferentially selected to generate the low-parameter steam to supply heat to the outside, and the second temperature and pressure reducing device (18) is selected to generate the low-parameter steam to supply heat to the outside; meanwhile, the high-pressure exhaust steam of the high-pressure cylinder (6) of the steam turbine is preferentially selected as a high-parameter steam source, the hot re-steam of the reheater (505) is selected as the high-parameter steam source, and the main steam of the high-pressure superheater (506) is selected as the high-parameter steam source;
when the unit is in a heat supply working condition and has no peak regulation requirement, and high-parameter steam is provided for a heat user, the high-pressure exhaust steam of the high-pressure cylinder (6) of the steam turbine is preferentially selected as a high-parameter steam source, the hot re-steam of the reheater (505) is selected as the high-parameter steam source, and finally the main steam of the high-pressure superheater (506) is selected as the high-parameter steam source;
When the unit is in a heat supply working condition and has peak regulation requirements, if a steam heat accumulator (19) is utilized for steam heat accumulation, the high-pressure exhaust steam of a high-pressure cylinder (6) of the steam turbine is preferentially selected as a heat accumulation steam source, the hot re-steam of a reheater (505) is selected as the heat accumulation steam source, and finally the main steam of a high-pressure superheater (506) is selected as the heat accumulation steam source; if the steam heat accumulator (19) is used for releasing heat of steam, the operation of the second temperature and pressure reduction device (18) is stopped preferentially, and then the operation of the pressure matcher (17) is stopped;
when the unit is in a pure condensation working condition and has peak regulation requirements, if the steam heat storage device (19) is used for steam heat storage, the high-pressure exhaust steam of the high-pressure cylinder (6) of the steam turbine is preferentially selected as a heat storage steam source, and the main steam of the high-pressure superheater (506) is selected as the heat storage steam source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910108099.XA CN109869204B (en) | 2019-02-02 | 2019-02-02 | Heat supply and power peak regulation coupling system for gas-steam combined cycle unit and operation method thereof |
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| CN110778442B (en) * | 2019-10-16 | 2021-01-05 | 华南理工大学 | Method and system for improving peak shaving power supply energy efficiency by using vertical pipe to charge and discharge seawater for energy storage |
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| CN111255534A (en) * | 2020-03-31 | 2020-06-09 | 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 |
| CN111412031B (en) * | 2020-04-16 | 2022-07-01 | 京能(赤峰)能源发展有限公司 | Combined heat and power generation method capable of meeting resident and industrial heat supply requirements during deep peak shaving |
| CN113357689A (en) * | 2021-06-29 | 2021-09-07 | 国网黑龙江省电力有限公司电力科学研究院 | Method for improving adjusting capacity of heat supply unit |
| CN113336289B (en) * | 2021-06-29 | 2022-11-01 | 西安热工研究院有限公司 | Water-heat-electricity cogeneration system with wide-load operation of power plant and operation method |
| CN114017149A (en) * | 2021-09-18 | 2022-02-08 | 华能国际电力江苏能源开发有限公司南通电厂 | Heat supply steam source matching system and method under deep peak regulation working condition |
| CN114017148A (en) * | 2021-11-23 | 2022-02-08 | 河北鲲能电力工程咨询有限公司 | Peak regulation method for large coal-electricity steam heat storage power generation |
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