CN105298565B - Variable working condition active-control light-coal complementation indirect air-cooling generation system and method - Google Patents
Variable working condition active-control light-coal complementation indirect air-cooling generation system and method Download PDFInfo
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Abstract
The invention discloses a variable working condition active-control light-coal complementation indirect air-cooling generation system and method. The system comprises a boiler, a turbine, a generator, a high-pressure fed water heater, a low-pressure fed water heater, a deaerator, a steam extraction branch control valve, an absorption type refrigerator, an air-cooling condenser, a fed water branch control valve, a mirror field heat exchanger and a composite paraboloid light condenser. In the daytime in summer, the environmental temperature rises, the back pressure of the turbine rises, the turbine carries out low-pressure steam extraction to drive the absorption type refrigerator to cool air at the inlet of the air-cooling condenser, the back pressure of the turbine is made to reach the design valve, and the light condenser is used for replacing original low-pressure steam extraction to heat fed water. In the daytime in winter, the environmental temperature decreases, the back pressure of the turbine can keep the design value, the turbine carries out low-pressure steam extraction to continue expansion working, and the light condenser is used for replacing original low-pressure steam extraction to heat fed water. By means of the variable working condition active-control light-coal complementation indirect air-cooling generation system and method, the problem of the variable working condition operation efficiency of a traditional air-cooling unit is reduced in summer is solved, the annual average generation efficiency of the unit is improved, and efficient utilization of low-temperature solar energy is achieved.
Description
Technical field
The present invention relates to solar energy is exchanged work with fossil energy complemental power-generation and indirect air cooling technical field, more particularly to one kind
The light coal complementation indirect air cooling electricity generation system of condition active control and method.
Background technology
Ended for the end of the year 2009, China adds up to the operation operation of 35.4GW Direct Air-Cooleds fired power generating unit, installed capacity reaches thermoelectricity
The 5.4% of total installation of generating capacity, Direct Air-cooled Unit has water saving, resistance to frost is good, floor space is little, investment cost is low excellent
Point.But meanwhile, Direct Air-cooled Unit is affected by environment significantly, and ambient temperature can have a negative impact to its economical operation, in the summer
During Ji Gaowen is hot, unit operation back pressure is higher, rises to 30～40kPa from 10～19kPa of design back-pressure, and unit is force-landed negative
Lotus runs, and has had a strong impact on the economical operation of unit, and the average annual generating efficiency of unit will decline to a great extent.For this purpose, some power stations are in the summer
Carry out frequent high standard cleaning season, or install water spray additional realizing cooling, but this water saving target with Direct Air-Cooled to air cooling unit
Run in the opposite direction, and produce little effect.
It should be noted that summer sweltering heat weather is generally accompanied with solar irradiation intensity height, this is just direct for improving
The summer variable parameter operation performance of Air-cooled Unit provides a new thinking.The practicality of Application No. 201420508838.7 is new
Type patent proposes a kind of Air-cooled Unit of solar energy absorption type refrigeration, drives absorption refrigeration by solar thermal collector,
Exchange heat to reduce air cooler inlet air temperature in air cooling unit, strengthen the purpose of air cooler cooling effect.But more than
Summer of the scheme mainly for sweltering heat, when winter environment temperature drop, when Air-cooled Unit is capable of achieving declared working condition operation, solar energy
Jing Chang will be chronically at idle state, cause fixed investment to waste, and whole system economy is difficult to improve.
Therefore, how to carry out total system active control, it is ensured that the generated output of fired power generating unit is stable under variable working condition, realizes machine
The annual generating efficiency of group is close to declared working condition, while fully effectively utilizes solar energy resources, is become and solved directly using solar energy
Connect the key technical problem of an air cooling variable parameter operation difficult problem.
The content of the invention
(1) technical problem to be solved
In view of this, present invention is primarily targeted at providing a kind of light coal complementation indirect air cooling of variable working condition active control
Electricity generation system and method, the critical process such as the Power island of system, backheat subsystem, absorption refrigeration unit are intercoupled, root
According to varying environment condition, draw gas in heating feedwater, drive between the functions such as absorption refrigeration, expansion working by steam turbine low-pressure
Active switching, realize the active control of light coal complementary system indirect refrigeration, make the summer generating efficiency of thermal power station still close to setting
Meter operating mode, and winter also can effectively utilizes solar energy resources, improve whole system Technical Economy.
(2) technical scheme
For reaching above-mentioned purpose, the system the invention provides a kind of light coal complementation indirect air cooling of variable working condition active control generates electricity
System, the system include boiler 1, steam turbine high-pressure cylinder 2, Steam Turbine Through IP Admission 3, turbine low pressure cylinder 4, electromotor 5, high-pressure feed water
Heater 6, high pressure water pump 7, oxygen-eliminating device 8, low-pressure feed heater 9, low pressure feed water pump 10, the flow circuit control valve 11 that draws gas, suction
Receipts formula refrigeration machine 12, air-cooled condenser 13, feedwater flow circuit control valve 14, mirror field heat exchanger 15 and compound parabolic concentrator 16,
Wherein：
Boiler 1, steam turbine high-pressure cylinder 2, Steam Turbine Through IP Admission 3, turbine low pressure cylinder 4, the heating of electromotor 5, high-pressure feed water
Device 6, high pressure water pump 7, oxygen-eliminating device 8, low-pressure feed heater 9, low pressure feed water pump 10 and air-cooled condenser 13 constitute heating power and follow
Loop back path；Absorption Refrigerator 12 and air-cooled condenser 13 constitute Absorption Refrigerator branch road, mirror field heat exchanger 15 and compound throwing
Object plane condenser 16 constitutes mirror field heat exchanger branch road, and turbine low pressure cylinder 4 and low-pressure feed heater 9 constitute heating feedwater of drawing gas
Branch road；
Boiler 1 produces main steam, passes sequentially through steam turbine high-pressure cylinder 2, Steam Turbine Through IP Admission 3, turbine low pressure cylinder 4 and expands
Work done, drives 5 external electromotive power output of electromotor；Exhaust steam is cooled to condensed water into air-cooled condenser 13, by low pressure feed water
Pump 10 pressurizes, and heats into low-pressure feed heater 9, then into oxygen-eliminating device 8, then is further pressurizeed by high pressure water pump 7,
Into high-pressure feed-water heater 6, after being heated to the requirement of boiler inlet water temperature, into boiler, thermodynamic cycle is completed；
In summer day, ambient temperature is raised, and when causing turbine back pressure to rise, the flow circuit control valve 11 that draws gas is opened and absorbed
Formula refrigeration machine branch road, steam turbine low-pressure draw gas for driving Absorption Refrigerator, 13 intake air of air-cooled condenser are carried out cold
But, turbine back pressure is made to be close to design load；Meanwhile, feedwater flow circuit control valve 14 opens mirror field heat exchanger branch road, enables compound throwing
Object plane condenser 16, substitutes former low-pressure pumping steam heating low pressure feed water；
Daytime in the winter time, ambient temperature decline, and steam turbine can maintain back pressure when being design load, and the flow circuit control valve 11 that draws gas is closed
Absorption Refrigerator branch road is closed, steam turbine low-pressure draws gas and can continue expansion working in turbine low pressure cylinder 4；Meanwhile, feedwater stream
Road control valve 14 opens mirror field heat exchanger branch road, enables compound parabolic concentrator 16, substitutes former low-pressure pumping steam heating low pressure and gives
Water；
At summer and night in winter, ambient temperature declines, and steam turbine can maintain back pressure when being design load, stream control of drawing gas
Valve 11 cuts out Absorption Refrigerator branch road, and unlatching is drawn gas and heats feedwater branch road, and steam turbine low-pressure draws gas into the low pressure of minimal pressure
Feed-water heater 9, recovery heating feeding water function；Meanwhile, feedwater flow circuit control valve 14 closes mirror field heat exchanger branch road, compound parabolic
Face condenser 16 cuts out.
In such scheme, driving heat source temperature needed for the Absorption Refrigerator 12 is connect with steam turbine low-pressure extraction temperature
Closely, 16 heat-collecting temperature of compound parabolic concentrator is close to low pressure feed water heating-up temperature, and system is realized indirect air cooling, improves steamer
While machine cycle efficieny, it is ensured that in newly-increased flow process, irreversible loss is minimum；And due to solar irradiation intensity and ambient temperature
There is positive association relation, can be by low-pressure pumping steam in heating low pressure feed water, driving absorption refrigeration, in vapour under the conditions of varying environment
Active switching between three functions of turbine low pressure (LP) cylinder expansion working, realizes the active control of light coal complementary system indirect refrigeration.
In such scheme, the flow circuit control valve 11 that draws gas opens Absorption Refrigerator branch road, its flow in summer day
Control is raised depending on ambient temperature, causes condenser inlet air themperature elevated-levels, as far as possible satisfaction draw gas refrigerating capacity can be by
Air themperature is cooled to design load.
In such scheme, the flow circuit control valve 11 that draws gas closes Absorption Refrigerator branch road in the winter time daytime, draws gas
Turbine low pressure cylinder expansion working；When 16 heat-collecting capacity of compound parabolic concentrator can not fully meet low pressure feed water demand for heat
When, partly draws gas the low-pressure feed heater that still enter, and its flow-control depends on solar irradiation situation, meets its thermal discharge enough
Remaining feedwater is heated to into design temperature.
In such scheme, the feedwater flow circuit control valve 14 opens mirror field heat exchanger branch road in summer and daytime in winter, its
Flow-control depends on solar irradiation situation, meets 16 heat-collecting capacity of compound parabolic concentrator by into mirror field heat exchanger branch road
Feedwater is heated to design temperature.
In such scheme, mirror field heat exchanger 15 is in parallel with low-pressure feed heater 9, with power station heat regenerative system in its
Remaining feed-water heater series operation.
In such scheme, the low-pressure pumping steam for driving Absorption Refrigerator 12, in refrigeration machine after exothermic condensation, in wind
The outlet of cool condenser 13 is collected with other condensed waters, participates in again the thermodynamic cycle of unit.
For reaching above-mentioned purpose, present invention also offers a kind of light coal complementation indirect air cooling of variable working condition active control generates electricity
Method, the method include：
Boiler 1 produces main steam, passes sequentially through steam turbine high-pressure cylinder 2, Steam Turbine Through IP Admission 3, turbine low pressure cylinder 4 and expands
Work done, drives 5 external electromotive power output of electromotor；Exhaust steam is cooled to condensed water into air-cooled condenser 13, by low pressure feed water
Pump 10 pressurizes, and heats into low-pressure feed heater 9, then into oxygen-eliminating device 8, then is further pressurizeed by high pressure water pump 7,
Into high-pressure feed-water heater 6, after being heated to the requirement of boiler inlet water temperature, into boiler, thermodynamic cycle is completed；
In summer day, ambient temperature is raised, and when causing turbine back pressure to rise, the flow circuit control valve that draws gas is opened absorption
Refrigeration machine branch road, steam turbine low-pressure draw gas for driving Absorption Refrigerator, air-cooled condenser intake air is cooled down, is made
Turbine back pressure is close to design load；Meanwhile, feedwater flow circuit control valve opens mirror field heat exchanger branch road, enables composite parabolic optically focused
Device, substitutes former low-pressure pumping steam heating low pressure feed water；
Daytime in the winter time, ambient temperature decline, and steam turbine can maintain back pressure when being design load, and the flow circuit control valve that draws gas is closed
Absorption Refrigerator branch road, steam turbine low-pressure draw gas and can continue expansion working in turbine low pressure cylinder；Meanwhile, stream control of feeding water
Valve processed opens mirror field heat exchanger branch road, enables compound parabolic concentrator, substitutes former low-pressure pumping steam heating low pressure feed water；
At summer and night in winter, ambient temperature declines, and steam turbine can maintain back pressure when being design load, stream control of drawing gas
Valve cuts out Absorption Refrigerator branch road, and unlatching is drawn gas heating feedwater branch road, the low pressure that steam turbine low-pressure draws gas into minimal pressure to
Water heater, recovery heating feeding water function；Meanwhile, feedwater flow circuit control valve closes mirror field heat exchanger branch road, and composite parabolic gathers
Light device Jing Chang is closed.
In such scheme, the flow circuit control valve 11 that draws gas opens Absorption Refrigerator branch road, its flow in summer day
Control depending on ambient temperature rising, cause condenser inlet air themperature elevated-levels, i.e., as far as possible satisfaction draw gas refrigerating capacity can
Air themperature is cooled to into design load.
In such scheme, the flow circuit control valve 11 that draws gas closes Absorption Refrigerator branch road in the winter time daytime, and drawing gas can be in vapour
Turbine low pressure (LP) cylinder expansion working；When 16 heat-collecting capacity of compound parabolic concentrator can not fully meet low pressure feed water demand for heat,
Draws gas the low-pressure feed heater that still enter for part, and its flow-control depends on solar irradiation situation, meets its thermal discharge and enough will
Remaining feedwater is heated to design temperature.
In such scheme, the feedwater flow circuit control valve 14 opens mirror field heat exchanger branch road in summer and daytime in winter, its
Flow-control depends on solar irradiation situation, meets 16 heat-collecting capacity of compound parabolic concentrator by into mirror field heat exchanger branch road
Feedwater is heated to design temperature.
In such scheme, the light coal complementation indirect air cooling of the variable working condition active control according to claim 1 is sent out
Its in electric system, it is characterised in that mirror field heat exchanger 15 is in parallel with low-pressure feed heater 9, with power station heat regenerative system
Remaining feed-water heater series operation.
In such scheme, the low-pressure pumping steam for driving Absorption Refrigerator 12, in refrigeration machine after exothermic condensation, in wind
The outlet of cool condenser 13 is collected with other condensed waters, participates in again the thermodynamic cycle of unit.
(3) beneficial effect
From above-mentioned technical proposal as can be seen that the invention has the advantages that：
1st, using the present invention, summer day drives Absorption Refrigerator by low-pressure pumping steam, air cooling unit is dropped
Temperature, is capable of achieving the stable and high effective operation of summer Direct Air-cooled Unit, and generating efficiency is close to design level；
2nd, using the present invention, daytime in winter, solar energy heating Jing Chang low-pressure pumping steam is substituted, heats low pressure feed water, low pressure is taken out
Vapour can continue in turbine low pressure cylinder expansion working, go out work(so as to increase system, improve system effectiveness, while realizing the low temperature sun
The efficient utilization of energy；
3rd, using the present invention, when daytime in winter, solar irradiation was not enough, part low-pressure pumping steam can still be used for heating low pressure feed water,
Low-pressure feed heater exit water temperature is made to reach design load, it is ensured that the stable operation of steam turbine；
4th, using the present invention, it is to avoid the Jing Chang in very long winter leaves unused, and is conducive to making full use of, being combined for solar energy resources
The investment of paraboloid condenser is reclaimed.
Description of the drawings
Fig. 1 is a kind of light coal complementation indirect air cooling electricity generation system of the variable working condition active control according to the embodiment of the present invention
Schematic diagram；
Wherein reference is：1- boilers；2- steam turbine high-pressure cylinders；3- Steam Turbine Through IP Admissions；4- turbine low pressure cylinders；5-
Electromotor；6- high-pressure feed-water heaters；7- high pressure water pumps；8- oxygen-eliminating devices；9- low-pressure feed heaters；10- low pressure feed waters add
Hot device；11- draw gas branch road control valve；12- Absorption Refrigerators；13- air-cooled condensers；14- feedwater branch road control valves；15- mirrors
Field heat exchanger；16- compound parabolic concentrators (CPC) Jing Chang.
Specific embodiment
For making the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail.
As shown in figure 1, the light coal complementation indirect air cooling that Fig. 1 is the variable working condition active control according to the embodiment of the present invention generates electricity
The schematic diagram of system, the system include boiler 1, steam turbine high-pressure cylinder 2, Steam Turbine Through IP Admission 3, turbine low pressure cylinder 4, electromotor
5th, high-pressure feed-water heater 6, high pressure water pump 7, oxygen-eliminating device 8, low-pressure feed heater 9, low pressure feed water pump 10, stream control of drawing gas
Valve processed 11, Absorption Refrigerator 12, air-cooled condenser 13, feedwater flow circuit control valve 14, mirror field heat exchanger 15 and composite parabolic
Condenser 16, wherein, boiler 1, steam turbine high-pressure cylinder 2, Steam Turbine Through IP Admission 3, turbine low pressure cylinder 4, electromotor 5, high pressure are given
Water heater 6, high pressure water pump 7, oxygen-eliminating device 8, low-pressure feed heater 9, low pressure feed water pump 10 and air-cooled condenser 13 are constituted
Thermodynamic cycle loop；Absorption Refrigerator 12 and air-cooled condenser 13 constitute Absorption Refrigerator branch road, 15 He of mirror field heat exchanger
Compound parabolic concentrator 16 constitutes mirror field heat exchanger branch road, and turbine low pressure cylinder 4 and low-pressure feed heater 9 are constituted to draw gas and added
Heat feedwater branch road.
Boiler 1 produces main steam, passes sequentially through steam turbine high-pressure cylinder 2, Steam Turbine Through IP Admission 3, turbine low pressure cylinder 4 and expands
Work done, drives 5 external electromotive power output of electromotor；Exhaust steam is cooled to condensed water into air-cooled condenser 13, by low pressure feed water
Pump 10 pressurizes, and heats into low-pressure feed heater 9, then into oxygen-eliminating device 8, then is further pressurizeed by high pressure water pump 7,
Into high-pressure feed-water heater 6, after being heated to the requirement of boiler inlet water temperature, into boiler, thermodynamic cycle is completed.
In summer day, ambient temperature is raised, and when causing turbine back pressure to rise, the flow circuit control valve 11 that draws gas is opened and absorbed
Formula refrigeration machine branch road, steam turbine low-pressure draw gas for driving Absorption Refrigerator, 13 intake air of air-cooled condenser are carried out cold
But, turbine back pressure is made to be close to design load；Meanwhile, feedwater flow circuit control valve 14 opens mirror field heat exchanger branch road, enables compound throwing
Object plane condenser 16, substitutes former low-pressure pumping steam heating low pressure feed water.
Daytime in the winter time, ambient temperature decline, and steam turbine can maintain back pressure when being design load, and the flow circuit control valve 11 that draws gas is closed
Absorption Refrigerator branch road is closed, steam turbine low-pressure draws gas and can continue expansion working in turbine low pressure cylinder 4；Meanwhile, feedwater stream
Road control valve 14 opens mirror field heat exchanger branch road, enables compound parabolic concentrator 16, substitutes former low-pressure pumping steam heating low pressure and gives
Water.
At summer and night in winter, ambient temperature declines, and steam turbine can maintain back pressure when being design load, stream control of drawing gas
Valve 11 cuts out Absorption Refrigerator branch road, and unlatching is drawn gas and heats feedwater branch road, and steam turbine low-pressure draws gas into the low pressure of minimal pressure
Feed-water heater 9, recovery heating feeding water function；Meanwhile, feedwater flow circuit control valve 14 closes mirror field heat exchanger branch road, compound parabolic
Face condenser 16 cuts out.
Driving heat source temperature needed for Absorption Refrigerator 12 is close to steam turbine low-pressure extraction temperature, composite parabolic optically focused
16 heat-collecting temperature of device is close to low pressure feed water heating-up temperature, while system is realized indirect air cooling, improves steam turbine cycle efficiency,
In ensure that newly-increased flow process, irreversible loss is minimum；And as solar irradiation intensity and ambient temperature have positive association relation, no
Can be made in heating low pressure feed water, driving absorption refrigeration, in turbine low pressure cylinder expansion by low-pressure pumping steam with environmental condition
Active switching between three functions of work(, realizes the active control of light coal complementary system indirect refrigeration.
In Fig. 1, the flow circuit control valve 11 that draws gas opens Absorption Refrigerator branch road in summer day, and its flow-control is depended on
Ambient temperature raise, cause condenser inlet air themperature elevated-levels, as far as possible meet draw gas refrigerating capacity can be cold by air themperature
But to design load.The flow circuit control valve 11 that draws gas closes Absorption Refrigerator branch road in the winter time daytime, draws gas in turbine low pressure cylinder
Expansion working；When 16 heat-collecting capacity of compound parabolic concentrator can not fully meet low pressure feed water demand for heat, partly draw gas still
Into low-pressure feed heater, its flow-control depends on solar irradiation situation, meets its thermal discharge and adds remaining feedwater enough
Heat is to design temperature.Feedwater flow circuit control valve 14 opens mirror field heat exchanger branch road in summer and daytime in winter, and its flow-control takes
Certainly in solar irradiation situation, meet 16 heat-collecting capacity of compound parabolic concentrator and the feedwater into mirror field heat exchanger branch road is heated to
Design temperature.Mirror field heat exchanger 15 is in parallel with low-pressure feed heater 9, with remaining the feed-water heater string in the heat regenerative system of power station
Through transport row.Drive Absorption Refrigerator 12 low-pressure pumping steam, in refrigeration machine after exothermic condensation, air-cooled condenser 13 outlet with
Other condensed waters collect, and participate in again the thermodynamic cycle of unit.
Light coal complementation indirect air cooling electricity generation system based on the variable working condition active control shown in Fig. 1, present invention also offers
A kind of light coal complementation indirect air cooling electricity-generating method of variable working condition active control, the method include：
Boiler 1 produces main steam, passes sequentially through steam turbine high-pressure cylinder 2, Steam Turbine Through IP Admission 3, turbine low pressure cylinder 4 and expands
Work done, drives 5 external electromotive power output of electromotor；Exhaust steam is cooled to condensed water into air-cooled condenser 13, by low pressure feed water
Pump 10 pressurizes, and heats into low-pressure feed heater 9, then into oxygen-eliminating device 8, then is further pressurizeed by high pressure water pump 7,
Into high-pressure feed-water heater 6, after being heated to the requirement of boiler inlet water temperature, into boiler, thermodynamic cycle is completed；
In summer day, ambient temperature is raised, and when causing turbine back pressure to rise, the flow circuit control valve that draws gas is opened absorption
Refrigeration machine branch road, steam turbine low-pressure draw gas for driving Absorption Refrigerator, air-cooled condenser intake air is cooled down, is made
Turbine back pressure is close to design load；Meanwhile, feedwater flow circuit control valve opens mirror field heat exchanger branch road, enables composite parabolic optically focused
Device, substitutes former low-pressure pumping steam heating low pressure feed water；
Daytime in the winter time, ambient temperature decline, and steam turbine can maintain back pressure when being design load, and the flow circuit control valve that draws gas is closed
Absorption Refrigerator branch road, steam turbine low-pressure draw gas and can continue expansion working in turbine low pressure cylinder；Meanwhile, stream control of feeding water
Valve processed opens mirror field heat exchanger branch road, enables compound parabolic concentrator, substitutes former low-pressure pumping steam heating low pressure feed water；
At summer and night in winter, ambient temperature declines, and steam turbine can maintain back pressure when being design load, stream control of drawing gas
Valve cuts out Absorption Refrigerator branch road, and unlatching is drawn gas heating feedwater branch road, the low pressure that steam turbine low-pressure draws gas into minimal pressure to
Water heater, recovery heating feeding water function；Meanwhile, feedwater flow circuit control valve closes mirror field heat exchanger branch road, and composite parabolic gathers
Light device Jing Chang is closed.
In the specific embodiment that the present invention is provided, Chinese vast southern area (Zhejiang Province, Jiangsu Province etc.) summer
Daily mean temperature is higher, while solar irradiation aboundresources, carries out solar energy from local 330MW Direct Air-Cooleds formula Coal-fired Thermal Power station
Complementary transformation, unit design back pressure are 15kPa, and design air temperature is 17 DEG C, unit low-pressure feed heater under declared working condition
Import/export water temperature design load is 55.4/93.1 DEG C, and former three-level low-pressure pumping steam thermal parameter is respectively 290.8 DEG C/0.5969MPa；
208.5℃/0.2692MPa；106.4℃/0.0918MPa.Unit year, hours of operation was about 5000, wherein the summer operation time
For 3000 hours, winter run time was 2000 hours.
Summer day, daily mean temperature are nearly 27 DEG C, do not take the unit of complementary transformation, back pressure to rise to 30kPa, and power drop is
310MW, generating efficiency are down to 38.3% from 40.8%, and efficiency declines 2.5 percentage points.Former low-pressure pumping steam is driven single by the present invention
Effect lithium bromide absorption refrigerating set, for reducing air cooling unit entering air temperature.Former wind cooling unit design wind speed is
2.15m/s, design front face area are 5368m2, it is more than 85 DEG C from the occurrence temperature of refrigeration unit, COP is 0.7, then be reality
Existing air cooling unit cooling, drives absorption refrigeration unit institute calorific requirement to be 212.7MW, and the total thermal discharge of low-pressure pumping steam is 96MW,
Air themperature can be reduced by 4.5 degree, back pressure is reduced to 25kPa, and power increases to 317MW, and whole summer will be expected to increment life insurance
21GWh, now efficiency of generating unit is 39.2%；Meanwhile, adopt CPC compound parabolic concentrators to obtain import/export temperature for
75/174 DEG C of hot water, substitutes former unit low-pressure pumping steam and feedwater is heated to design temperature.
On daytime in winter, under design temperature, air cooling unit normal operation, former low-pressure pumping steam can continue in vapour daily mean temperature
Turbine low pressure (LP) cylinder expansion working, whole winter are expected to increase generated energy 20GWh, and generating efficiency increases to 42.0%；Meanwhile, adopt
CPC compound parabolic concentrators obtain the hot water that import/export temperature is 75/174 DEG C, substitute former unit low-pressure pumping steam heating feedwater
To design temperature, low-temperature solar energy efficient utilization is capable of achieving, the net generating efficiency of solar energy is up to 12%.Summer and night in winter, fire
Group of motors reverts to former operational mode, low-pressure pumping steam be still used for heating it is low add to water, compound parabolic concentrator is closed, it is ensured that machine
The safe and stable operation of group.
To sum up, complementary transformation is carried out to fired power generating unit using solar energy, realizes indirect air cooling, be expected to realize annual generated energy
It is significantly increased, it is contemplated that increase electricity and can meet 10,000 people's Urban Annual Electrical Power Consumption amounts (per capita household electricity consumption 3936kWh in 2013), make thermal motor
Up to 40.3%, even more than unit design level, and make full use of solar energy heating Jing Chang in the winter time is real for the annual generating efficiency of group
The efficiency power generation of existing low-temperature solar energy.
Particular embodiments described above, has been carried out to the purpose of the present invention, technical scheme and beneficial effect further in detail
Describe bright, the be should be understood that specific embodiment that the foregoing is only the present invention in detail, be not limited to the present invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., should be included in the guarantor of the present invention
Within the scope of shield.
Claims (11)
1. the light coal complementation indirect air cooling electricity generation system of a kind of variable working condition active control, it is characterised in that the system includes boiler
(1), steam turbine high-pressure cylinder (2), Steam Turbine Through IP Admission (3), turbine low pressure cylinder (4), electromotor (5), high-pressure feed-water heater
(6), high pressure water pump (7), oxygen-eliminating device (8), low-pressure feed heater (9), low pressure feed water pump (10), draw gas flow circuit control valve
(11), Absorption Refrigerator (12), air-cooled condenser (13), feedwater flow circuit control valve (14), mirror field heat exchanger (15) and be combined
Paraboloid condenser (16), wherein：
Boiler (1), steam turbine high-pressure cylinder (2), Steam Turbine Through IP Admission (3), turbine low pressure cylinder (4), electromotor (5), high pressure are given
Water heater (6), high pressure water pump (7), oxygen-eliminating device (8), low-pressure feed heater (9), low pressure feed water pump (10) and air cooling are cold
Condenser (13) constitutes thermodynamic cycle loop；Absorption Refrigerator (12) and air-cooled condenser (13) constitute Absorption Refrigerator
Road, mirror field heat exchanger (15) and compound parabolic concentrator (16) constitute mirror field heat exchanger branch road, turbine low pressure cylinder (4) and low
Pressure feed-water heater (9) constitutes the heating feedwater branch road that draws gas；
Boiler (1) produces main steam, passes sequentially through steam turbine high-pressure cylinder (2), Steam Turbine Through IP Admission (3), turbine low pressure cylinder (4)
Expansion working, drives electromotor (5) externally electromotive power output；Exhaust steam is cooled to condensed water into air-cooled condenser (13), passes through
Low pressure feed water pump (10) pressurizes, and heats into low-pressure feed heater (9), then into oxygen-eliminating device (8), then by high-pressure feed water
Pump (7) further pressurizes, and into high-pressure feed-water heater (6), after being heated to the requirement of boiler inlet water temperature, into boiler, completes
Thermodynamic cycle；
In summer day, ambient temperature is raised, and when causing turbine back pressure to rise, the flow circuit control valve that draws gas (11) is opened absorption
Refrigeration machine branch road, steam turbine low-pressure draw gas for driving Absorption Refrigerator, air-cooled condenser (13) intake air are carried out cold
But, turbine back pressure is made to be close to design load；Meanwhile, mirror field heat exchanger branch road is opened in feedwater flow circuit control valve (14), enables compound
Paraboloid condenser (16), substitutes former low-pressure pumping steam heating low pressure feed water；
Daytime in the winter time, ambient temperature decline, and steam turbine can maintain back pressure when being design load, and the flow circuit control valve that draws gas (11) is closed
Absorption Refrigerator branch road, steam turbine low-pressure draw gas and can continue expansion working in turbine low pressure cylinder (4)；Meanwhile, feedwater stream
Mirror field heat exchanger branch road is opened on road control valve (14), enables compound parabolic concentrator (16), substitutes former low-pressure pumping steam heating low
Pressure feedwater；
At summer and night in winter, ambient temperature declines, and steam turbine can maintain back pressure when being design load, and draw gas flow circuit control valve
(11) Absorption Refrigerator branch road is closed, unlatching is drawn gas and heats feedwater branch road, and steam turbine low-pressure draws gas into the low pressure of minimal pressure
Feed-water heater (9), recovery heating feeding water function；Meanwhile, mirror field heat exchanger branch road is closed in feedwater flow circuit control valve (14), is combined
Paraboloid condenser (16) is closed；
The low-pressure pumping steam for driving Absorption Refrigerator (12), in refrigeration machine after exothermic condensation, in air-cooled condenser (13)
Outlet is collected with other condensed waters, participates in again the thermodynamic cycle of unit.
2. the light coal complementation indirect air cooling electricity generation system of variable working condition active control according to claim 1, it is characterised in that
Driving heat source temperature needed for Absorption Refrigerator (12) is close to steam turbine low-pressure extraction temperature, compound parabolic concentrator
(16) heat-collecting temperature is close to low pressure feed water heating-up temperature, while system is realized indirect air cooling, improves steam turbine cycle efficiency,
In ensure that newly-increased flow process, irreversible loss is minimum；And as solar irradiation intensity and ambient temperature have positive association relation, no
Can be made in heating low pressure feed water, driving absorption refrigeration, in turbine low pressure cylinder expansion by low-pressure pumping steam with environmental condition
Active switching between three functions of work(, realizes the active control of light coal complementary system indirect refrigeration.
3. the light coal complementation indirect air cooling electricity generation system of variable working condition active control according to claim 1, it is characterised in that
The flow circuit control valve that draws gas (11) open Absorption Refrigerator branch road in summer day, and its flow-control depends on ambient temperature
Raise, cause condenser inlet air themperature elevated-levels, meeting refrigerating capacity of drawing gas as far as possible can be cooled to design by air themperature
Value.
4. the light coal complementation indirect air cooling electricity generation system of variable working condition active control according to claim 1, it is characterised in that
The flow circuit control valve that draws gas (11) close Absorption Refrigerator branch road in the winter time daytime, draw gas
Work(；When compound parabolic concentrator (16) heat-collecting capacity can not fully meet low pressure feed water demand for heat, partly draw gas and still enter
Low-pressure feed heater, its flow-control depend on solar irradiation situation, meet its thermal discharge and are heated to remaining feedwater enough
Design temperature.
5. the light coal complementation indirect air cooling electricity generation system of variable working condition active control according to claim 1, it is characterised in that
Feedwater flow circuit control valve (14) opens mirror field heat exchanger branch road in summer and daytime in winter, and its flow-control depends on the sun
Irradiation situation, meets compound parabolic concentrator (16) heat-collecting capacity and the feedwater into mirror field heat exchanger branch road is heated to design temperature
Degree.
6. the light coal complementation indirect air cooling electricity generation system of variable working condition active control according to claim 1, it is characterised in that
Mirror field heat exchanger (15) is in parallel with low-pressure feed heater (9), with remaining the feed-water heater string in the heat regenerative system of power station
Through transport row.
7. a kind of light coal complementation indirect air cooling electricity-generating method of variable working condition active control, is applied to any one of claim 1 to 6
Described system, the method include：
Boiler (1) produces main steam, passes sequentially through steam turbine high-pressure cylinder (2), Steam Turbine Through IP Admission (3), turbine low pressure cylinder (4)
Expansion working, drives electromotor (5) externally electromotive power output；Exhaust steam is cooled to condensed water into air-cooled condenser (13), passes through
Low pressure feed water pump (10) pressurizes, and heats into low-pressure feed heater (9), then into oxygen-eliminating device (8), then by high-pressure feed water
Pump (7) further pressurizes, and into high-pressure feed-water heater (6), after being heated to the requirement of boiler inlet water temperature, into boiler, completes
Thermodynamic cycle；
In summer day, ambient temperature is raised, and when causing turbine back pressure to rise, the flow circuit control valve that draws gas opens absorption refrigeration
Machine branch road, steam turbine low-pressure draw gas for driving Absorption Refrigerator, and air-cooled condenser intake air is cooled down, steamer is made
Machine back pressure is close to design load；Meanwhile, feedwater flow circuit control valve opens mirror field heat exchanger branch road, enables compound parabolic concentrator,
Substitute former low-pressure pumping steam heating low pressure feed water；
Daytime in the winter time, ambient temperature decline, and steam turbine can maintain back pressure when being design load, and the flow circuit control valve that draws gas is closed and absorbed
Formula refrigeration machine branch road, steam turbine low-pressure draw gas and can continue expansion working in turbine low pressure cylinder；Meanwhile, feed water flow circuit control valve
Mirror field heat exchanger branch road is opened, compound parabolic concentrator is enabled, former low-pressure pumping steam heating low pressure feed water is substituted；
At summer and night in winter, ambient temperature declines, and steam turbine can maintain back pressure when being design load, and the flow circuit control valve that draws gas is closed
Absorption Refrigerator branch road is closed, unlatching is drawn gas and heats feedwater branch road, and the low pressure feed water that steam turbine low-pressure draws gas into minimal pressure adds
Hot device, recovery heating feeding water function；Meanwhile, feedwater flow circuit control valve closes mirror field heat exchanger branch road, compound parabolic concentrator
Jing Chang is closed；
Wherein, the low-pressure pumping steam for driving Absorption Refrigerator, in refrigeration machine after exothermic condensation, exports in air-cooled condenser
Collect with other condensed waters, participate in again the thermodynamic cycle of unit.
8. the light coal complementation indirect air cooling electricity-generating method of variable working condition active control according to claim 7, it is characterised in that
The flow circuit control valve that draws gas (11) open Absorption Refrigerator branch road in summer day, and its flow-control depends on ambient temperature
Raise, cause condenser inlet air themperature elevated-levels, i.e., air themperature can be cooled to and set by satisfaction refrigerating capacity of drawing gas as far as possible
Evaluation.
9. the light coal complementation indirect air cooling electricity-generating method of variable working condition active control according to claim 7, it is characterised in that
The flow circuit control valve (11) that draws gas closes Absorption Refrigerator branch road in the winter time daytime, draws gas and can make in turbine low pressure cylinder expansion
Work(；When compound parabolic concentrator (16) heat-collecting capacity can not fully meet low pressure feed water demand for heat, partly draw gas and still enter
Low-pressure feed heater, its flow-control depend on solar irradiation situation, meet its thermal discharge and are heated to remaining feedwater enough
Design temperature.
10. the light coal complementation indirect air cooling electricity-generating method of variable working condition active control according to claim 7, its feature exist
In feedwater flow circuit control valve (14) opens mirror field heat exchanger branch road in summer and daytime in winter, and its flow-control is depended on
Solar irradiation situation, meets compound parabolic concentrator (16) heat-collecting capacity and is heated to setting by the feedwater into mirror field heat exchanger branch road
Meter temperature.
The light coal complementation indirect air cooling electricity-generating method of 11. variable working condition active controls according to claim 7, its feature exist
In mirror field heat exchanger (15) is in parallel with low-pressure feed heater (9), with remaining feed-water heater in the heat regenerative system of power station
Series operation.
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| CN108800651B (en) * | 2018-07-16 | 2024-01-23 | 中国科学院工程热物理研究所 | Thermal power air cooling condenser safety degree summer device based on day and night electric power peak regulation |
| CN111241711B (en) * | 2020-02-19 | 2021-12-28 | 西安交通大学 | Photoelectric conversion efficiency optimization control method for light-coal complementary system variable working condition |
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