CN109869784A - It is a kind of to integrate the combined cycle power plant and its operation method that couple with accumulation of heat peak regulation for steam extraction - Google Patents
It is a kind of to integrate the combined cycle power plant and its operation method that couple with accumulation of heat peak regulation for steam extraction Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Abstract
The present invention relates to a kind of for the integrated combined cycle power plant and its operation method coupled with accumulation of heat peak regulation of steam extraction, including gas turbine group and vapor wheel unit；Gas turbine group includes gas turbine blower, gas-turbine combustion chamber, gas turbine turbine and the first generator, and vapor wheel unit includes waste heat boiler, steam turbine high-pressure cylinder, turbine low pressure cylinder, the second generator, condenser, condensate pump, gland heater, oxygen-eliminating device, the first reducing-and-cooling plant, the second reducing-and-cooling plant, steam accumulator, work device, power-equipment, heat exchangers for district heating, hydrophobic heat exchanger and pumps for hot water supply net；The present invention is based on cascaded utilization of energy principles, and combine steam surplus energy utility mode, carry out the Integrated design of different steam extraction modes, effectively improve 6FA type combined cycle unit thermoelectricity decoupling service ability, steam accumulator is utilized simultaneously, both the peak-frequency regulation ability of combined cycle unit had been improved, has in turn ensured the external heating capacity under combined cycle unit full working scope.
Description
Technical field
The invention belongs to promote the technical field of thermoelectricity unit flexibility, and in particular to one kind is integrated for steam extraction and accumulation of heat
The combined cycle power plant and its operation method of peak regulation coupling.
Background technique
Currently, China's policy gradually payes attention to the popularization of new energy, the ratio of fired power generating unit is reduced, so that the hair of fired power generating unit
Exhibition faces a severe test.Currently, to improve the comprehensive energy utilization efficiency of fired power generating unit, and strive for more gas-to electricity hours
Number, depth excavate the heat capacity of fired power generating unit, increasingly obtain the attention of various circles of society.Gas cogeneration is a kind of heat
The energy utilization type that energy, electric energy produce simultaneously, high-grade thermal energy is used to generate electricity by it, and low-grade thermal energy is used for heat supply,
Not only the utilization efficiency of the energy had been improved, but also has reduced environmental pollution, had been had in terms of energy-saving and reduce disposal of pollutants very big
Application value.
Currently, the main problems faced of gas cogeneration central heating system is that hotspot stress is relatively low, conventional combustion gas thermoelectricity
Thermoelectricity ratio caused by coproduction combination, which has, centainly limits to, and advanced, high conversion efficiency unit, hotspot stress is got over
Small, by taking 100,000 kW units as an example, hotspot stress is 0.7 or so.Under the severe situation for especially facing Present Thermal Power depth peak regulation,
Unit is often run with running on the lower load, and the external heat capacity of unit is lower at this time, thus causes serious shadow to for thermal safety
It rings.However, the prior art such as patent " a kind of cogeneration system of combined cycle (patent No. 201310401252.0) ", is benefit
With external heat supply after height row's steam extraction pressure and temperature reducing, which is: (1) not considering that the cascade utilization of energy, direct desuperheat subtract
The acting capacity loss of pressure is larger；(2) thermoelectricity depth peak regulation needs are not considered, and to meet extraneous heat supply, unit need to be with high load capacity
Operation, peak load regulation ability are poor.The prior art such as patent " Combined cycle gas-steam turbine heating system (patent No.
201710534092.5) ", be arranged in utilizing steam extraction or the low pressure filling of waste heat boiler be it is extraneous heat supply is provided needed for steam and
The characteristics of steam needed for refrigeration, extra low pressure filling can transport into steam pipe as the occasion requires, the technology is only to consider extraneous heat supply
Demand, and unit power peak regulation demand is not considered, merely with middle pressure vapour or the filling of boiler low pressure as steam extraction source, Wu Fachong
Divide the peak modulation capacity for excavating unit.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and provide it is a kind of design rationally, performance
It is reliable to integrate the combined cycle power plant and its operation method that couple with accumulation of heat peak regulation for steam extraction.
Technical solution used by the present invention solves the above problems is: a kind of integrate for steam extraction couples with accumulation of heat peak regulation
Combined cycle power plant characterized by comprising gas turbine group and vapor wheel unit；
The gas turbine group includes gas turbine blower, gas-turbine combustion chamber, gas turbine turbine and the first generator,
The exhaust outlet of the gas turbine blower and the air inlet of gas-turbine combustion chamber connect, the row of the gas-turbine combustion chamber
Port is connect with the air inlet of gas turbine turbine, and the exhaust outlet of the gas turbine turbine passes through smoke discharge pipe and waste heat pot
The gas inlet of furnace connects, and the gas turbine turbine drives the first electrical power generators, and gas turbine turbine and gas turbine
Compressor is coaxially connected；
The vapor wheel unit includes waste heat boiler, steam turbine high-pressure cylinder, turbine low pressure cylinder, the second generator, condenser, coagulates
Bear water pump, gland heater, oxygen-eliminating device, the first reducing-and-cooling plant, the second reducing-and-cooling plant, steam accumulator, acting are set
Standby, power-equipment, heat exchangers for district heating, hydrophobic heat exchanger and pumps for hot water supply net, the steam turbine high-pressure cylinder and turbine low pressure cylinder
It is coaxially connected, and drive the second electrical power generators, the waste heat boiler include smoke-gas preheater, low-pressure drum, low-pressure superheater,
HP steam drum and high-pressure superheater, the water outlet of the smoke-gas preheater simultaneously with the water inlet of low-pressure drum and HP steam drum
Water inlet connection, the venthole of the low-pressure drum and the air intake of low-pressure superheater connect, the venthole of the HP steam drum
It is connect with the air intake of high-pressure superheater, the air intake of the steam turbine high-pressure cylinder passes through high-pressure steam pipe and high-pressure superheater
Venthole connection, and No.1 valve is installed in the air intake of steam turbine high-pressure cylinder, the steam drain of the steam turbine high-pressure cylinder is logical
The air intake for spending communicating pipe and turbine low pressure cylinder connects, and is equipped with hydraulic pressure butterfly valve in the air intake of turbine low pressure cylinder, institute
The one end for stating communicating pipe and low pressure steam pipe connects, and is equipped with No. three valves, the low pressure mistake in one end of low pressure steam pipe
The venthole of hot device and the other end of low pressure steam pipe connect, and are equipped with No. four valves, institute in the other end of low pressure steam pipe
The steam drain for stating turbine low pressure cylinder is connect with condenser, and the water inlet end of boiler feed pipe is connect with condenser, and the boiler is given
The water outlet of water pipe and the water inlet of smoke-gas preheater connect, and are sequentially installed on boiler feed pipe along water flowing direction
The admission end of condensate pump, gland heater and oxygen-eliminating device, high steam bypass is connect with high-pressure steam pipe, and in high steam
No. two valves are installed, the admission end of the first high steam branch pipe is connect with the steam output end that high steam bypasses, described in bypass
The steam output end of first high steam branch pipe is connect with the air intake of the first reducing-and-cooling plant, and on the first high steam branch pipe
No. six valves are installed, the venthole of first reducing-and-cooling plant is connect with the admission end of heating extraction steam pipe, and first
The venthole of reducing-and-cooling plant is equipped with No. seven valves, and the admission end and high steam of the second high steam branch pipe bypass
Steam output end connection, and be sequentially installed with No. eight valves and second along steam flow direction on the second high steam branch pipe and subtract
Warm decompressor, the steam output end of the second high steam branch pipe simultaneously with the air intake of steam accumulator and work device into
Steam ports connection, and No. ten valves and No. nine valves are separately installed in the air intake of steam accumulator and the air intake of work device
Door, the venthole of the steam accumulator are connect with the admission end of heating extraction steam pipe, and are installed in the venthole of steam accumulator
There is ride on Bus No. 11 valve, the steam drain of the work device is connect with the admission end of heating extraction steam pipe, and in the steam discharge of work device
Mouth is equipped with ten No. two valves, and the admission end of low-pressure steam bypass is connect with low pressure steam pipe, and the low-pressure steam bypass goes out
Vapour end is connect with the admission end of heating extraction steam pipe, and is equipped with No. five valves in low-pressure steam bypass, and the oxygen-eliminating device passes through
Deoxygenation extraction steam pipe is connect with the steam output end that low-pressure steam bypasses, and ten No. three valves are equipped on deoxygenation extraction steam pipe, described to adopt
The steam output end of warm extraction steam pipe and the air intake of heat exchangers for district heating connect, and ten No. four valves, institute are equipped on heating extraction steam pipe
The hydrophobic import connection of the high temperature of the hydrophobic outlet and hydrophobic heat exchanger of stating heat exchangers for district heating, the hydrophobic outlet of the low temperature of hydrophobic heat exchanger
It is connected by the water inlet of drain pipe and condensate pump, and ten No. five valves is installed on drain pipe, heat supply network return pipe and dredged
The water at low temperature side-entrance of water- to-water heat exchanger connects, and pumps for hot water supply net is equipped on heat supply network return pipe, the hydrophobic heat exchanger
The water side-entrance of water at low temperature side outlet and heat exchangers for district heating connects, and the water side outlet of heat exchangers for district heating is connect with heat supply network water supplying pipe.
Furthermore, the work device driving power-equipment does work, and work device is that back pressure machine or screw rod are swollen
Swollen machine, power-equipment are the equipment such as generator, pumps for hot water supply net or condensate pump.
Furthermore, first reducing-and-cooling plant, steam accumulator and work device are to be connected in parallel, and are simultaneously
Steam required for oxygen-eliminating device and heat exchangers for district heating provide.
Furthermore, the oxygen-eliminating device is filled with low-pressure steam bypass, the first pressure and temperature reducing simultaneously by deoxygenation extraction steam pipe
It sets, steam accumulator is connected with work device.
Furthermore, the heat exchangers for district heating is subtracted with low-pressure steam bypass, the first desuperheat simultaneously by heating extraction steam pipe
Pressure device, steam accumulator are connected with work device.
Furthermore, the high-pressure steam pipe is bypassed by high steam simultaneously with the first high steam branch pipe into vapour
End is connected with the admission end of the second high steam branch pipe.
The operation method for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction is as follows:
When unit is in pure condensate operating condition, when unregulated power peak regulation demand:
Open No.1 valve, hydraulic pressure butterfly valve, No. three valves, No. four valves, No. five valves and ten No. three valves, combined cycle unit
Heat supply is not carried out externally, and the deoxygenation steam of oxygen-eliminating device is from the low pressure filling of low-pressure superheater；
When unit is in pure condensate operating condition, when having power peak regulation demand:
A, when unit needs to reduce externally output electric load, steam accumulation of heat is mainly carried out by steam accumulator, is lowered into
The steam flow of steam turbine acting, at this time:
No. two valves, No. eight valves and No. ten valves are also opened, the high steam from high-pressure superheater passes through the second desuperheat
It after decompressor carries out pressure and temperature reducing, then is delivered to steam accumulator and carries out accumulation of heat, be lowered into the steam stream of steam turbine acting
Amount, to reduce unit output power and promote unit load responding frequency；
B, when unit needs to increase externally output electric load, steam heat release is mainly carried out by steam accumulator, increases and enters
The steam flow of steam turbine acting, at this time:
No. two valves, No. eight valves and No. ten valves are also turn off, ride on Bus No. 11 valve is opened, steam accumulator is provided for oxygen-eliminating device and removed
Oxygen steam provides low pressure filling for turbine low pressure cylinder, increases the steam flow for entering steam turbine acting, to increase machine
Group output power and promotion unit load responding frequency；
When unit is in supplying thermal condition, when unregulated power peak regulation demand:
Open No.1 valve, hydraulic pressure butterfly valve, No. three valves, No. four valves, No. five valves, ten No. three valves, ten No. four valves and
Ten No. five valves, combined cycle unit externally carry out heat supply, high using the low pressure filling of low-pressure superheater or steam turbine at this time
The steam discharge of cylinder pressure is directly as the deoxygenation steam of oxygen-eliminating device and the heating steam of heat exchangers for district heating；
Alternatively, opening No. two valves, No. six valves and No. seven valves, the high steam of high-pressure superheater passes through the first pressure and temperature reducing
As the deoxygenation steam of oxygen-eliminating device and the heating steam of heat exchangers for district heating after device progress pressure and temperature reducing；
Alternatively, opening No. two valves, No. eight valves, No. nine valves and ten No. two valves, the high steam pioneer of high-pressure superheater
Dynamic work device driving acting, then using the steam discharge of work device as the deoxygenation steam of oxygen-eliminating device and adopting for heat exchangers for district heating
Warm steam；
When unit is in supplying thermal condition, when having power peak regulation demand:
A, when unit needs to reduce externally output electric load, steam accumulation of heat is mainly carried out by steam accumulator, is lowered into
The steam flow of steam turbine acting, concrete operations are as follows:
No. two valves, No. eight valves and No. ten valves are also opened, the high steam of high-pressure superheater is filled into the second pressure and temperature reducing
It sets, steam accumulator is delivered to after pressure and temperature reducing and carries out accumulation of heat, the steam flow of steam turbine acting is lowered into, to drop
Low unit output power and promotion unit load responding frequency；
B, when unit needs to increase externally output electric load, subtracted using the bypass of steam accumulator substitution low-pressure steam, the first desuperheat
Pressure device and work device, to increase the steam flow to do work into steam turbine, concrete operations are as follows:
No. five valves are closed, low-pressure steam bypass is in off state；
No. two valves, No. six valves and No. seven valves are closed, the first reducing-and-cooling plant is made no longer to work；
No. two valves, No. eight valves, No. ten valves and ten No. two valves are closed, make the second reducing-and-cooling plant and work device not
It works again；
At this point, being also turn off No. ten valves, ride on Bus No. 11 valve is opened, deoxygenation steam is provided by steam accumulator for oxygen-eliminating device and is
Heat exchangers for district heating provides heating steam, increases the steam flow for entering steam turbine acting, to increase unit output power and mention
Rise unit load response frequency.
In the above-mentioned operation method for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction:
When unit is in supplying thermal condition and unregulated power peak regulation demand, the low pressure filling of preferential Selection utilization low-pressure superheater or
The steam discharge of steam turbine high-pressure cylinder is as the deoxygenation steam of oxygen-eliminating device and the heating steam of heat exchangers for district heating, secondly Selection utilization acting
Equipment provides deoxygenation steam for oxygen-eliminating device and provides heating steam, last the first pressure and temperature reducing of Selection utilization dress for heat exchangers for district heating
Oxygen-eliminating device is set to deoxygenation steam is provided and provides heating steam for heat exchangers for district heating；
When unit is in supplying thermal condition and has power peak regulation demand, preferential Selection utilization steam accumulator provides for oxygen-eliminating device to be removed
Oxygen steam and heating steam is provided for heat exchangers for district heating, secondly the low pressure filling of Selection utilization low-pressure superheater or steam turbine are high
The steam discharge of cylinder pressure as the deoxygenation steam of oxygen-eliminating device and the heating steam of heat exchangers for district heating, again Selection utilization work device be except
Oxygen device provides deoxygenation steam and provides heating steam for heat exchangers for district heating, and last the first reducing-and-cooling plant of Selection utilization is deoxygenation
Device provides deoxygenation steam and provides heating steam for heat exchangers for district heating.
Compared with prior art, the present invention having the following advantages that and effect: structure is simple, design rationally, reliable performance, base
In cascaded utilization of energy principle, and steam surplus energy utility mode is combined, carries out the Integrated design of different steam extraction modes, effectively improve
6FA type combined cycle unit thermoelectricity decouples service ability, while utilizing steam accumulator, has both improved the tune of combined cycle unit
Peak fm capacity in turn ensures the external heating capacity under combined cycle unit full working scope.After the present invention, connection is realized
Conjunction Cycle Unit power peak regulation cooperates with matching with heat supply, has both significantly reduced under unit full working scope in external heating process
Do work capacity loss, and meets the power peak regulation frequency modulation Policy Demand of current rigorous, is worth with practice higher.
Detailed description of the invention
Fig. 1 is the structural representation in the embodiment of the present invention for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction
Figure.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1, the combined cycle power plant coupled with accumulation of heat peak regulation is integrated for steam extraction in the present embodiment, comprising: combustion
Turbine unit and vapor wheel unit；
Gas turbine group includes gas turbine blower 1, gas-turbine combustion chamber 2, gas turbine turbine 3 and the first generator 4,
The exhaust outlet of gas turbine blower 1 is connect with the air inlet of gas-turbine combustion chamber 2, the exhaust outlet of gas-turbine combustion chamber 2
It is connect with the air inlet of gas turbine turbine 3, the exhaust outlet of gas turbine turbine 3 passes through smoke discharge pipe 22 and waste heat boiler 5
Gas inlet connection, gas turbine turbine 3 drives the power generation of the first generator 4, and gas turbine turbine 3 is calmed the anger with gas turbine
Machine 1 is coaxially connected；
Vapor wheel unit include waste heat boiler 5, steam turbine high-pressure cylinder 6, turbine low pressure cylinder 7, the second generator 8, condenser 9,
Condensate pump 10, gland heater 11, oxygen-eliminating device 12, the first reducing-and-cooling plant 13, the second reducing-and-cooling plant 14, steam store
Hot device 15, work device 16, power-equipment 17, heat exchangers for district heating 18, hydrophobic heat exchanger 19 and pumps for hot water supply net 20, steam turbine are high
Cylinder pressure 6 and turbine low pressure cylinder 7 are coaxially connected, and drive the power generation of the second generator 8, and waste heat boiler 5 includes smoke-gas preheater
501, low-pressure drum 502, low-pressure superheater 503, HP steam drum 504 and high-pressure superheater 505, the water outlet of smoke-gas preheater 501
Mouthful simultaneously connect with the water inlet of the water inlet of low-pressure drum 502 and HP steam drum 504, the venthole of low-pressure drum 502 with it is low
The air intake connection of superheater 503 is pressed, the venthole of HP steam drum 504 is connect with the air intake of high-pressure superheater 505, steam turbine
The air intake of high pressure cylinder 6 is connect by high-pressure steam pipe 23 with the venthole of high-pressure superheater 505, and in steam turbine high-pressure cylinder 6
Air intake No.1 valve 41 is installed, the steam drain of steam turbine high-pressure cylinder 6 by communicating pipe 25 and turbine low pressure cylinder 7 into
Steam ports connection, and hydraulic pressure butterfly valve 43, communicating pipe 25 and the one of low pressure steam pipe 26 are installed in the air intake of turbine low pressure cylinder 7
End connection, and No. three valves 44, the venthole and low-pressure steam of low-pressure superheater 503 are installed in one end of low pressure steam pipe 26
The other end of pipe 26 connects, and is equipped with No. four valves 45, the steam discharge of turbine low pressure cylinder 7 in the other end of low pressure steam pipe 26
Mouth is connect with condenser 9, and the water inlet end of boiler feed pipe 21 is connect with condenser 9, the water outlet of boiler feed pipe 21 and flue gas
The water inlet of preheater 501 connects, and is sequentially installed with condensate pump 10, axis along water flowing direction on boiler feed pipe 21
Heater 11 and oxygen-eliminating device 12 are sealed, the admission end of high steam bypass 24 is connect with high-pressure steam pipe 23, and by high steam
No. two valves 42 are installed, the steam output end of admission end and the high steam bypass 24 of the first high steam branch pipe 27 connects on road 24
It connects, the steam output end of the first high steam branch pipe 27 is connect with the air intake of the first reducing-and-cooling plant 13, and is steamed in the first high pressure
No. six valves 47 are installed, the venthole of the first reducing-and-cooling plant 13 and the admission end of heating extraction steam pipe 31 connect on vapour branch pipe 27
It connects, and No. seven valves 48, the admission end of the second high steam branch pipe 28 is installed in the venthole of the first reducing-and-cooling plant 13
It connect with the steam output end of high steam bypass 24, and is successively installed on the second high steam branch pipe 28 along steam flow direction
Have No. eight valves 49 and the second reducing-and-cooling plant 14, the steam output end of the second high steam branch pipe 28 simultaneously with steam accumulator 15
Air intake connected with the air intake of work device 16, and in the air intake of the air intake of steam accumulator 15 and work device 16
No. ten valves 51 and No. nine valves 50 are separately installed with, the venthole of steam accumulator 15 and the admission end of heating extraction steam pipe 31 connect
It connects, and ride on Bus No. 11 valve 52, the steam drain and heating extraction steam pipe of work device 16 is installed in the venthole of steam accumulator 15
31 admission end connection, and be equipped with ten No. two valves 53 in the steam drain of work device 16, low-pressure steam bypass 29 into vapour
End is connect with low pressure steam pipe 26, and the steam output end of low-pressure steam bypass 29 is connect with the admission end of heating extraction steam pipe 31, and low
No. five valves 46, the vapour out that oxygen-eliminating device 12 passes through deoxygenation extraction steam pipe 30 and low-pressure steam bypass 29 are installed in pressure steam by-pass 29
End connection, and ten No. three valves 54 are installed on deoxygenation extraction steam pipe 30, the steam output end and heat exchangers for district heating of heating extraction steam pipe 31
18 air intake connection, and is equipped with ten No. four valves 55 on heating extraction steam pipe 31, the hydrophobic outlet of heat exchangers for district heating 18 with
The hydrophobic import connection of the high temperature of hydrophobic heat exchanger 19, the hydrophobic outlet of the low temperature of hydrophobic heat exchanger 19 pass through drain pipe 32 and condensed water
The water inlet connection of pump 10, and ten No. five valves 56 are installed on drain pipe 32, heat supply network return pipe 33 and hydrophobic heat exchanger 19
Water at low temperature side-entrance connection, and pumps for hot water supply net 20 is installed on heat supply network return pipe 33, the water at low temperature of hydrophobic heat exchanger 19
Side outlet is connect with the water side-entrance of heat exchangers for district heating 18, and the water side outlet of heat exchangers for district heating 18 is connect with heat supply network water supplying pipe 34.
Work device 16 drives power-equipment 17 to do work, and work device 16 is back pressure machine or screw expander, power
Equipment 17 is the equipment such as generator, pumps for hot water supply net or condensate pump.
First reducing-and-cooling plant 13, steam accumulator 15 are connected in parallel with work device 16, while being oxygen-eliminating device 12
Required steam is provided with heat exchangers for district heating 18.
Oxygen-eliminating device 12 bypasses 29 steam output end, the first reducing-and-cooling plant by deoxygenation extraction steam pipe 30 with low-pressure steam simultaneously
13 venthole, the venthole of steam accumulator 15 are connected with the venthole of work device 16.
The air intake of heat exchangers for district heating 18 by heating extraction steam pipe 31 simultaneously with low-pressure steam bypass 29 steam output end, first
The venthole of reducing-and-cooling plant 13, the venthole of steam accumulator 15 are connected with the venthole of work device 16.
High-pressure steam pipe 23 passes through high steam bypass 24 while the admission end and second with the first high steam branch pipe 27
The admission end of high steam branch pipe 28 connects.
Carrying out practically method in the present embodiment for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction is as follows:
When unit is in pure condensate operating condition, when unregulated power peak regulation demand:
No.1 valve 41,45, No. five valve 46 and ten No. three valves 54 of valve of valve 44, four of hydraulic pressure butterfly valve 43, three are opened,
Combined cycle unit does not carry out heat supply externally, and the deoxygenation steam of oxygen-eliminating device 12 is from the low pressure filling of low-pressure superheater 503；
When unit is in pure condensate operating condition, when having power peak regulation demand:
A, unit need reduce externally output electric load when, steam accumulation of heat is mainly carried out by steam accumulator 15, reduce into
Enter the steam flow of steam turbine acting, at this time:
42, No. eight valves 49 of No. two valves and No. ten valves 51 are also opened, the high steam from high-pressure superheater 505 passes through
It after second reducing-and-cooling plant 14 carries out pressure and temperature reducing, then is delivered to steam accumulator 15 and carries out accumulation of heat, be lowered into steam turbine
The steam flow of acting, to reduce unit output power and promote unit load responding frequency；
B, unit need increase externally output electric load when, steam heat release is mainly carried out by steam accumulator 15, increase into
Enter the steam flow of steam turbine acting, at this time:
Be also turn off 42, No. eight valves 49 of No. two valves and No. ten valves 51, open ride on Bus No. 11 valve 52, steam accumulator 15 be except
Oxygen device 12 provides deoxygenation steam or provides low pressure filling for turbine low pressure cylinder 7, increases the steam stream for entering steam turbine acting
Amount, to increase unit output power and promote unit load responding frequency；
When unit is in supplying thermal condition, when unregulated power peak regulation demand:
Open No.1 valve 41, the valve 46,13 of valve 45, five of valve 44, four of hydraulic pressure butterfly valve 43, three valve 54,
Ten No. four valve 55 and ten No. five valves 56, combined cycle unit externally carries out heat supply, utilizes the low of low-pressure superheater 503 at this time
The steam discharge of filling or steam turbine high-pressure cylinder 6 is pressed to steam directly as the heating of the deoxygenation steam and heat exchangers for district heating 18 of oxygen-eliminating device 12
Vapour；
Alternatively, open 42, No. six valves 47 of No. two valves and No. seven valves 48, the high steam of high-pressure superheater 505 passes through the
As the deoxygenation steam of oxygen-eliminating device 12 and the heating steam of heat exchangers for district heating 18 after one reducing-and-cooling plant 13 progress pressure and temperature reducing；
Alternatively, opening No. two valve 50 and ten No. two valves 53 of valve 49, nine of valve 42, eight, the height of high-pressure superheater 505
Steam setter is pressed to move the driving acting of work device 16, then using the steam discharge of work device 16 as the deoxygenation steam of oxygen-eliminating device 12
With the heating steam of heat exchangers for district heating 18；
When unit is in supplying thermal condition, when having power peak regulation demand:
A, unit need reduce externally output electric load when, steam accumulation of heat is mainly carried out by steam accumulator 15, reduce into
Enter the steam flow of steam turbine acting, concrete operations are as follows:
42, No. eight valves 49 of No. two valves and No. ten valves 51 are also opened, the high steam of high-pressure superheater 505 enters second and subtracts
Warm decompressor 14 is delivered to steam accumulator 15 after pressure and temperature reducing and carries out accumulation of heat, is lowered into the steaming of steam turbine acting
Steam flow amount, to reduce unit output power and promote unit load responding frequency；
B, when unit needs to increase externally output electric load, low-pressure steam bypass 29, first is substituted using steam accumulator 15 and is subtracted
Warm decompressor 13 and work device 16, to increase the steam flow to do work into steam turbine, concrete operations are as follows:
No. five valves 46 are closed, low-pressure steam bypass 29 is in off state；
42, No. six valves 47 of No. two valves and No. seven valves 48 are closed, the first reducing-and-cooling plant 13 is made no longer to work；
Valve 51 and ten No. two valve 53 of valve 49, ten of No. two valves 42, eight is closed, 14 He of the second reducing-and-cooling plant is made
Work device 16 no longer works；
At this point, being also turn off No. ten valves 51, ride on Bus No. 11 valve 52 is opened, is that oxygen-eliminating device 12 provides deoxygenation by steam accumulator 15
Steam and heating steam is provided for heat exchangers for district heating 18, increase the steam flow for entering steam turbine acting, so that it is defeated to increase unit
Power and promotion unit load responding frequency out.
In above-mentioned operation method:
When unit is in supplying thermal condition and unregulated power peak regulation demand, the low pressure filling of preferential Selection utilization low-pressure superheater 503
Or secondly the steam discharge of steam turbine high-pressure cylinder 6 is selected as the deoxygenation steam of oxygen-eliminating device 12 and the heating steam of heat exchangers for district heating 18
It selects and is that oxygen-eliminating device 12 provides deoxygenation steam using work device 16 and is that heat exchangers for district heating 18 provides heating steam, finally selection benefit
It is that oxygen-eliminating device 12 provides deoxygenation steam with the first reducing-and-cooling plant 13 and is that heat exchangers for district heating 18 provides heating steam；
When unit is in supplying thermal condition and has power peak regulation demand, preferential Selection utilization steam accumulator 15 is that oxygen-eliminating device 12 mentions
There is provided heating steam for deoxygenation steam and for heat exchangers for district heating 18, secondly the low pressure filling of Selection utilization low-pressure superheater 503 or
The steam discharge of person's steam turbine high-pressure cylinder 6 selects again as the deoxygenation steam of oxygen-eliminating device 12 and the heating steam of heat exchangers for district heating 18
It is that oxygen-eliminating device 12 provides deoxygenation steam using work device 16 and is that heat exchangers for district heating 18 provides heating steam, last Selection utilization
First reducing-and-cooling plant 13 is that oxygen-eliminating device 12 provides deoxygenation steam and is that heat exchangers for district heating 18 provides heating steam.
In the carrying out practically method of the present embodiment, all valves all have the function of adjusting pipeline fluid flow；Except liquid
It presses except butterfly valve 43, other valves all have the function of truncation.
In the carrying out practically method of the present embodiment, the valvular aperture regulation of institute is controlled by the DCS of combined cycle unit
System remote operation processed is completed；The storage emission capacity and storage Exotherm Time of steam accumulator 15 need to consider electric power depth peak regulation simultaneously
The composite factors such as frequency modulation requires, the external heating capacity of unit and unit steam extraction integrated system regulating power determine.
It is any to be familiar with although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff of this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this hair
Bright protection scope.
Claims (8)
1. a kind of for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction characterized by comprising gas turbine group
With vapor wheel unit；
The gas turbine group includes gas turbine blower (1), gas-turbine combustion chamber (2), gas turbine turbine (3) and
The exhaust outlet of one generator (4), the gas turbine blower (1) is connect with the air inlet of gas-turbine combustion chamber (2), described
The exhaust outlet of gas-turbine combustion chamber (2) is connect with the air inlet of gas turbine turbine (3), the gas turbine turbine (3)
Exhaust outlet is connect by smoke discharge pipe (22) with the gas inlet of waste heat boiler (5), and the gas turbine turbine (3) drives the
One generator (4) power generation, and gas turbine turbine (3) and gas turbine blower (1) are coaxially connected；
The vapor wheel unit includes waste heat boiler (5), steam turbine high-pressure cylinder (6), turbine low pressure cylinder (7), the second generator
(8), condenser (9), condensate pump (10), gland heater (11), oxygen-eliminating device (12), the first reducing-and-cooling plant (13),
Two reducing-and-cooling plants (14), work device (16), power-equipment (17), heat exchangers for district heating (18), are dredged steam accumulator (15)
Water- to-water heat exchanger (19) and pumps for hot water supply net (20), the steam turbine high-pressure cylinder (6) and turbine low pressure cylinder (7) are coaxially connected, and
The second generator (8) are driven to generate electricity, the waste heat boiler (5) includes smoke-gas preheater (501), low-pressure drum (502), low pressure mistake
Hot device (503), HP steam drum (504) and high-pressure superheater (505), the water outlet of the smoke-gas preheater (501) simultaneously with it is low
Pressure drum (502) water inlet connected with the water inlet of HP steam drum (504), the venthole of the low-pressure drum (502) with it is low
Press the air intake connection of superheater (503), the venthole of the HP steam drum (504) and the air intake of high-pressure superheater (505)
The air intake of connection, the steam turbine high-pressure cylinder (6) is connected by the venthole of high-pressure steam pipe (23) and high-pressure superheater (505)
It connects, and is equipped with No.1 valve (41) in the air intake of steam turbine high-pressure cylinder (6), the steam drain of the steam turbine high-pressure cylinder (6)
It is connect by communicating pipe (25) with the air intake of turbine low pressure cylinder (7), and is equipped in the air intake of turbine low pressure cylinder (7)
Hydraulic pressure butterfly valve (43), the communicating pipe (25) connect with one end of low pressure steam pipe (26), and the one of low pressure steam pipe (26)
End is equipped with No. three valves (44), and the venthole of the low-pressure superheater (503) is connect with the other end of low pressure steam pipe (26),
And No. four valves (45) are installed in the other end of low pressure steam pipe (26), the steam drain of the turbine low pressure cylinder (7) and solidifying
Vapour device (9) connection, the water inlet end of boiler feed pipe (21) are connect with condenser (9), the water outlet of the boiler feed pipe (21)
It connect, and is sequentially installed with along water flowing direction on boiler feed pipe (21) solidifying with the water inlet of smoke-gas preheater (501)
Pump (10), gland heater (11) and oxygen-eliminating device (12) are born water, high steam bypasses the admission end and high-pressure steam pipe of (24)
(23) connect, and No. two valves (42) be installed in high steam bypass (24), the first high steam branch pipe (27) into vapour
It holds and is connect with the steam output end of high steam bypass (24), the steam output end of the first high steam branch pipe (27) subtracts with the first desuperheat
The air intake of pressure device (13) connects, and No. six valves (47) are equipped on the first high steam branch pipe (27), and described first
The venthole of reducing-and-cooling plant (13) is connect with the admission end of heating extraction steam pipe (31), and in the first reducing-and-cooling plant (13)
Venthole No. seven valves (48) are installed, admission end and the high steam bypass (24) of the second high steam branch pipe (28)
Steam output end connection, and be sequentially installed with No. eight valves (49) along steam flow direction on the second high steam branch pipe (28)
With the second reducing-and-cooling plant (14), the steam output end of the second high steam branch pipe (28) simultaneously with steam accumulator (15)
Air intake is connected with the air intake of work device (16), and the air intake of steam accumulator (15) and work device (16) into
Steam ports is separately installed with No. ten valves (51) and No. nine valves (50), the venthole of the steam accumulator (15) and heating steam extraction
The admission end connection of (31) is managed, and is equipped with ride on Bus No. 11 valve (52) in the venthole of steam accumulator (15), the acting is set
The steam drain of standby (16) is connect with the admission end of heating extraction steam pipe (31), and is equipped with 12 in the steam drain of work device (16)
The admission end of number valve (53), low-pressure steam bypass (29) is connect with low pressure steam pipe (26), the low-pressure steam bypass (29)
Steam output end connect with the admission end of heating extraction steam pipe (31), and low-pressure steam bypass (29) on No. five valves are installed
(46), the oxygen-eliminating device (12) is connect by deoxygenation extraction steam pipe (30) with the steam output end of low-pressure steam bypass (29), and in deoxygenation
Ten No. three valves (54), steam output end and heat exchangers for district heating (18) of the heating extraction steam pipe (31) are installed on extraction steam pipe (30)
Air intake connection, and is equipped with ten No. four valves (55) on heating extraction steam pipe (31), the heat exchangers for district heating (18) it is hydrophobic
Outlet is connect with the hydrophobic import of high temperature of hydrophobic heat exchanger (19), and the hydrophobic outlet of the low temperature of hydrophobic heat exchanger (19) passes through drain pipe
(32) it is connect with the water inlet of condensate pump (10), and ten No. five valves (56), heat supply network return water is installed on drain pipe (32)
Pipe (33) is connect with the water at low temperature side-entrance of hydrophobic heat exchanger (19), and is equipped with pumps for hot water supply net on heat supply network return pipe (33)
(20), the water at low temperature side outlet of the hydrophobic heat exchanger (19) is connect with the water side-entrance of heat exchangers for district heating (18), heat supply network heating
The water side outlet of device (18) is connect with heat supply network water supplying pipe (34).
2. according to claim 1 for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction, which is characterized in that
Work device (16) driving power-equipment (17) is done work, and work device (16) is back pressure machine or screw expander, moves
Power equipment (17) is generator, pumps for hot water supply net or condensate pump.
3. according to claim 1 for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction, which is characterized in that
First reducing-and-cooling plant (13), steam accumulator (15) are connected in parallel with work device (16), while being oxygen-eliminating device
(12) and heat exchangers for district heating (18) provides required steam.
4. according to claim 1 for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction, which is characterized in that
The oxygen-eliminating device (12) by deoxygenation extraction steam pipe (30) simultaneously with low-pressure steam bypass (29), the first reducing-and-cooling plant (13),
Steam accumulator (15) and work device (16) connection.
5. according to claim 1 for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction, which is characterized in that
The heat exchangers for district heating (18) bypasses (29), the first reducing-and-cooling plant with low-pressure steam simultaneously by heating extraction steam pipe (31)
(13), steam accumulator (15) and work device (16) connection.
6. according to claim 1 for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction, which is characterized in that
The high-pressure steam pipe (23) by high steam bypass (24) simultaneously with the admission end of the first high steam branch pipe (27) and the
The admission end of two high steam branch pipes (28) connects.
7. a kind of integrate the combined cycle power plant coupled with accumulation of heat peak regulation for steam extraction as of any of claims 1-6
Operation method, which is characterized in that the operation method is as follows:
When unit is in pure condensate operating condition, when unregulated power peak regulation demand:
Open No.1 valve (41), hydraulic pressure butterfly valve (43), No. three valves (44), No. four valves (45), No. five valves (46) and ten
No. three valves (54), combined cycle unit does not carry out heat supply externally, and the deoxygenation steam of oxygen-eliminating device (12) is from low area overheat
The low pressure filling of device (503)；
When unit is in pure condensate operating condition, when having power peak regulation demand:
A, it when unit needs to reduce externally output electric load, mainly by steam accumulator (15) Lai Jinhang steam accumulation of heat, reduces
The steam flow to do work into steam turbine, at this time:
Also open No. two valves (42), No. eight valves (49) and No. ten valves (51), the high pressure from high-pressure superheater (505)
Steam is after the second reducing-and-cooling plant (14) carry out pressure and temperature reducing, then is delivered to steam accumulator (15) and carries out accumulation of heat, drop
The low steam flow to do work into steam turbine, to reduce unit output power and promote unit load responding frequency；
B, when unit needs to increase externally output electric load, mainly by steam accumulator (15) Lai Jinhang steam heat release, increase
The steam flow to do work into steam turbine, at this time:
No. two valves (42), No. eight valves (49) and No. ten valves (51) are also turn off, are opened ride on Bus No. 11 valve (52), steam accumulation of heat
Device (15) is that oxygen-eliminating device (12) provide deoxygenation steam or is that turbine low pressure cylinder (7) provide low pressure filling, increases and enters steamer
The steam flow of machine acting, to increase unit output power and promote unit load responding frequency；
When unit is in supplying thermal condition, when unregulated power peak regulation demand:
Open No.1 valve (41), hydraulic pressure butterfly valve (43), No. three valves (44), No. four valves (45), No. five valves (46), 13
Number valve (54), ten No. four valves (55) and ten No. five valves (56), combined cycle unit externally carry out heat supply, at this time using low
Press superheater (503) low pressure filling or steam turbine high-pressure cylinder (6) steam discharge directly as oxygen-eliminating device (12) deoxygenation steam
With the heating steam of heat exchangers for district heating (18)；
Alternatively, opening No. two valves (42), No. six valves (47) and No. seven valves (48), the high pressure of high-pressure superheater (505) is steamed
Vapour passes through the deoxygenation steam and heat exchangers for district heating after the first reducing-and-cooling plant (13) progress pressure and temperature reducing as oxygen-eliminating device (12)
(18) heating steam；
Alternatively, opening No. two valves (42), No. eight valves (49), No. nine valves (50) and ten No. two valves (53), high pressure superheater
The high steam of device (505) first drives work device (16) driving acting, then using the steam discharge of work device (16) as removing
The deoxygenation steam of oxygen device (12) and the heating steam of heat exchangers for district heating (18)；
When unit is in supplying thermal condition, when having power peak regulation demand:
A, it when unit needs to reduce externally output electric load, mainly by steam accumulator (15) Lai Jinhang steam accumulation of heat, reduces
The steam flow to do work into steam turbine, concrete operations are as follows:
Also open No. two valves (42), No. eight valves (49) and No. ten valves (51), the high steam of high-pressure superheater (505) into
Enter the second reducing-and-cooling plant (14), steam accumulator (15) are delivered to after pressure and temperature reducing and carry out accumulation of heat, are lowered into vapour
The steam flow of turbine acting, to reduce unit output power and promote unit load responding frequency；
B, when unit needs to increase externally output electric load, steam accumulator (15) substitution low-pressure steam bypass (29), the are utilized
One reducing-and-cooling plant (13) and work device (16), to increase the steam flow to do work into steam turbine, concrete operations are such as
Under:
No. five valves (46) are closed, low-pressure steam bypass (29) is in off state；
No. two valves (42), No. six valves (47) and No. seven valves (48) are closed, the first reducing-and-cooling plant (13) no longer work is made
Make；
No. two valves (42), No. eight valves (49), No. ten valves (51) and ten No. two valves (53) are closed, the second pressure and temperature reducing is made
Device (14) and work device (16) no longer work；
At this point, being also turn off No. ten valves (51), open ride on Bus No. 11 valve (52), is oxygen-eliminating device (12) by steam accumulator (15)
Deoxygenation steam is provided and provides heating steam for heat exchangers for district heating (18), increases the steam flow for entering steam turbine acting, thus
Increase unit output power and promotes unit load responding frequency.
8. the operation method according to claim 7 for the integrated combined cycle power plant coupled with accumulation of heat peak regulation of steam extraction,
It is characterized by:
When unit is in supplying thermal condition and unregulated power peak regulation demand, the low pressure of preferential Selection utilization low-pressure superheater (503) is mended
The steam discharge of vapour or steam turbine high-pressure cylinder (6) is steamed as the heating of the deoxygenation steam and heat exchangers for district heating (18) of oxygen-eliminating device (12)
Vapour, secondly Selection utilization work device (16) is that oxygen-eliminating device (12) provide deoxygenation steam and is that heat exchangers for district heating (18) provide heating
Steam, last the first reducing-and-cooling plant of Selection utilization (13) are oxygen-eliminating device (12) offer deoxygenation steam and are heat exchangers for district heating
(18) heating steam is provided；
When unit is in supplying thermal condition and has power peak regulation demand, preferential Selection utilization steam accumulator (15) is oxygen-eliminating device
(12) deoxygenation steam is provided and provides heating steam for heat exchangers for district heating (18), next Selection utilization low-pressure superheater (503)
The steam discharge of low pressure filling or steam turbine high-pressure cylinder (6) is as the deoxygenation steam of oxygen-eliminating device (12) and adopting for heat exchangers for district heating (18)
Warm steam, Selection utilization work device (16) is that oxygen-eliminating device (12) provide deoxygenation steam and is that heat exchangers for district heating (18) provide again
Heating steam, last the first reducing-and-cooling plant of Selection utilization (13) are that oxygen-eliminating device (12) provide deoxygenation steam and are that heat supply network heats
Device (18) provides heating steam.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111120995A (en) * | 2019-12-05 | 2020-05-08 | 国网河北省电力有限公司电力科学研究院 | Heat storage system for expanding peak regulation output range of unit and peak regulation effect evaluation method |
| CN111271750A (en) * | 2020-03-18 | 2020-06-12 | 青岛达能环保设备股份有限公司 | Coal fired power plant frequency modulation peak shaving system based on heat accumulator |
| CN111425272A (en) * | 2020-04-09 | 2020-07-17 | 太原理工大学 | Heat supply control method for gas-steam combined cycle unit |
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| CN111271750A (en) * | 2020-03-18 | 2020-06-12 | 青岛达能环保设备股份有限公司 | Coal fired power plant frequency modulation peak shaving system based on heat accumulator |
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| CN111425272B (en) * | 2020-04-09 | 2022-04-01 | 太原理工大学 | Heat supply control method for gas-steam combined cycle unit |
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