A kind of operation of power networks method of the electricity generation system of low-carbon emission
Technical field
The present invention relates to a kind of electricity generation system, more particularly, to a kind of electricity generation system of low-carbon emission.
Background technology
In recent years, the generation of greenhouse gases clearly results in global warming, and greenhouse gases generation further increase by
More increase from global warming.Because carbon dioxide is considered as main greenhouse gases, therefore, the greenhouse with carbon dioxide as representative
The Global climate change that gas is largely discharged and triggered, is the mankind's most serious for facing at present and problem for needing most urgent solution
One of, carbon capture and storage are considered as to reduce greenhouse gases to discharge into the atmosphere and control a kind of possible master of global warming
Want means.
Carbon dioxide mostlys come from the burning of fossil fuel, the flue gas of conventional power plants generally comprise from about 4% to
About 14% carbon dioxide.In China, fossil fuel particularly Coal Energy Source is in important ground for a long time in power industry
Position, power industry be particularly a large amount of coal-burning power plants CO2 emissions account for national CO2 emission total amount 40~
50%.Therefore, Development of Novel environment-friendly power generation system, reduces CO2 emissions, subtracts for coal fired power plant or even whole society's carbon
The importance of row is self-evident.
It is now recognized that the collecting carbonic anhydride technology closest to large-scale industrial application is after-combustion trapping.Caught in after-combustion
Concentrate, carbon dioxide is removed from flue gas, remaining flue gas is discharged into the atmosphere and is used to carbon dioxide compression transport and store.
In various applications such as the carbon dioxide being captured can be used for sealing up for safekeeping, methyl alcohol manufacture and three oil are reclaimed.
Chemical absorbing carbon dioxide separation method be one kind be widely used, adaptable flue gas decarbonization technology.Its
Removing carbon dioxide is removed using absorbing from burning gases, and followed by steam stripping regeneration solvent and is captured comprising two in a solvent
Carbonoxide.But this method warms to supply Analytic Tower in needing to consume, to realize the carbon dioxide resolving in Analytic Tower.
To provide this partial heat, it is necessary to the steam that specified pressure is extracted from steam turbine cycle stream boils again for heating Analytic Tower
Device.
In the prior art, the patent of invention of 201080063370.X expires the steam pressure of extraction by vapor steam blaster
The demand of the operating pressure of sufficient carbon dioxide capture device, but its needs is provided for the vapor steam blaster of pressurization.
201110328338.6 patent of invention provides a kind of carbon dioxide recovery type thermal power generation system and its method of operation, and it passes through
Vapor flow rate adjustment mechanism, the amount of the steam extracted from the turbine is remained necessarily, can prevent the property of turbine
The separation and recovery of carbon dioxide is carried out while reducing.
But, in 201110328338.6 technical scheme, when the load of TRT is relatively low, in order to meet titanium dioxide
The demand of the operating pressure of carbon acquisition equipment, it needs to adjust each section of flow of the steam of extraction of steam turbine, increases from steam
The steam that the high pressure section of turbine is extracted, and can so cause the HCS of acting to reduce, the generating efficiency of system can be reduced.
The content of the invention
The invention provides a kind of electricity generation system of low-carbon emission, it can be protected in the amount of the steam for keeping turbine to extract
Hold as in the case of certain, when the load of TRT is relatively low, in the situation of the vapor flow rate for reducing steam turbine high pressure section
Under, it is also possible to the steam pressure of arrival carbon dioxide capture device is met the demand of its operating pressure.
As one aspect of the present invention, there is provided a kind of electricity generation system of low-carbon emission, it includes:Steam generator,
For heating generation high pressure high temperature vapor by fuel;Steam turbine, for being configured to receive from the steam generator
Steam, the steam turbine includes pressure turbine, middle-pressure turbine, low-pressure turbine and axle;Generator, steam turbine passes through
Axle driven dynamo, so as to produce electric energy;Carbon dioxide recovery plant, it reclaims the titanium dioxide in steam generator discharge flue gas
Carbon;The steam generator includes reheater, and it can be reheated high-pressure turbine outlet steam, be become again
Heat steam;Also include that exhaust pipe, the exhaust pipe are divided into the first pipeline and second after extracting the steam in middle-pressure turbine
Pipeline;The first pipeline steam is transported to condenser after heater is heated to condensed water;Second pipeline is divided into two
Road, wherein first via steam can reach carbon dioxide recovery plant by valve, and the second road steam can be reached by valve
Reheater;Steam can be extracted in the reheater export pipeline and reaches the carbon dioxide recovery plant.
Preferably, the first pipeline steam reaches the heater by the first valve, and the first via steam passes through
Second valve reaches the carbon dioxide recovery plant, and second road steam reaches the reheater, institute by the 3rd valve
The steam for stating the extraction of reheater export pipeline reaches the carbon dioxide recovery plant by the 4th valve.
Preferably, first to fourth valve is flow valve, and the flow of the first to the 3rd valve is controlled by control unit,
The vapor volume extracted via middle-pressure turbine is set to remain necessarily.
Preferably, the control unit controls the flow of the 4th valve, makes it equal with the flow of the 3rd valve.
Preferably, the control unit controls the flow of first to fourth valve, makes the arrival carbon dioxide recovery
The steam of equipment is equal to or slightly above pressure needed for carbon dioxide recovery plant normal work.
Preferably, when first valve, the second valve closing, the 3rd valve, four valve openings, institute is reached
The steam pressure for stating carbon dioxide recovery plant does not reach pressure described in carbon dioxide recovery plant normal work, the control still
Device can control the flow of the 4th valve more than the flow of the 3rd valve.
As another aspect of the present invention, there is provided the operation of power networks method of above-mentioned electricity generation system, including:Steam occurs
Device generates high pressure high temperature vapor and produces the exhaust with carbon dioxide, the exhaust to be transported to carbon dioxide recovery plant;
A certain amount of vapor volume is remained by what middle-pressure turbine was extracted;Steam will be extracted from middle-pressure turbine by the 3rd valve
At least a portion is transported to reheater;Steam being extracted from reheater export pipeline, carbon dioxide recovery is transported to by the 4th valve
Equipment.
Preferably, the network load in electricity generation system is at full capacity or during higher load, opens the first valve, second
Valve, closes the 3rd valve, the 4th valve, and the flow of the first valve and the second valve is controlled by control unit, makes in
Press the vapor volume of turbine extraction to remain necessarily, and reach the steam of the carbon dioxide recovery plant and be equal to or slightly higher
The pressure needed for carbon dioxide recovery plant normal work;When network load is in moderate duty, the first valve is closed, opened
Second valve, the 3rd valve, the 4th valve, make the vapor volume extracted via middle-pressure turbine remain necessarily, the 3rd valve
Flow is equal to the flow of the 4th valve, by adjusting the flow of the second valve, the 3rd valve, makes the arrival carbon dioxide recovery
The steam of equipment is equal to or slightly above pressure needed for carbon dioxide recovery plant normal work;When network load is in low bearing
During lotus, the first valve, the second valve are closed, open the 3rd valve, the 4th valve, make the vapor volume extracted via middle-pressure turbine
Certain, the 3rd valve of regulation, the flow of the 4th valve are remained, makes the flow of the 4th valve more than the flow of the 3rd valve, and
And the steam of the arrival carbon dioxide recovery plant is equal to or slightly above needed for carbon dioxide recovery plant normal work
Pressure.
Brief description of the drawings
Fig. 1 is the schematic diagram of embodiments of the invention.
Specific embodiment
One or more specific embodiments of the invention will be described below.In order to provide the brief of these embodiments
Description, may not in the description describe all features of actual realization.To make the above objects, features and advantages of the present invention
Can be more obvious understandable, the present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
The overall structure of the electricity generation system 1 of the low-carbon emission of the embodiment of the present invention is high referring to Fig. 1, including steam generator 6
Pressure turbine 21, low-pressure turbine 23, middle-pressure turbine 22, generator 24, condenser 26 and carbon dioxide recovery plant 1b.
Steam generator 6 includes superheater 9 and reheater 10, and it passes through fuel will add into water therein or steam
Heat turns into superheated vapor or reheat steam, and the flue gas generated after fuel combustion reaches carbon dioxide recovery plant by pipeline 5
1b。
The superheated vapor supply pressure turbine 21 of the generation of steam generator 6, drives pressure turbine 21 to rotate.High pressure whirlpool
The outlet steam of turbine 21, after the reheater 10 in steam generator 6 is heated again as reheat steam, by pipeline
Middle-pressure turbine 22 is transported to, drives middle-pressure turbine 22 to rotate.The outlet steam of middle-pressure turbine 22 reaches low by pipeline
Pressure turbine 23, starts low-pressure turbine 23 and rotates.Pressure turbine 21, middle-pressure turbine 22 and low-pressure turbine 23 pass through
Turbine shaft 20 connects generator 24, so as to drive generator 24 to be generated electricity.
The low-pressure steam of the outlet of low-pressure turbine 23 reaches condenser 26 by pipeline, and condensed water is cooled to wherein.
Condensed water is pumped into heater 32 by condensate pump 31, after being heated in heater 32, is conveyed by supply-water pump 34
To the superheater 9 of steam generator 6, a vapour-cycling is completed.
Carbon dioxide recovery plant 1b, for reclaiming the carbon dioxide in the discharge flue gas of steam generator 6.Can be using existing
There is known carbon dioxide recovery plant in technology, the carbon dioxide recovery plant in such as 201110328338.6.It includes two
Carbonoxide separating and reclaiming device 40 and reboiler 41.
Exhaust pipe 51 is divided into the first pipeline 52 and the second pipeline 53 after extracting the steam in middle-pressure turbine 22.First pipe
The steam of road 52 is transported to condenser 26 after first flow valve 54 is communicated to heater 32 to condensed water heating.Second pipeline
53 points is two-way, and wherein first via steam can reach reboiler 41 by second flow valve 55, and the second road steam passes through the 3rd
Flow valve 56 can reach reheater 10.The outlet reheat steam of reheater 10 is divided into two-way, wherein being transported to middle pressure turbine all the way
Machine 22, the 4th flow valve 57 is led up in addition can be transported to reboiler 41.
Flowmeter 60 is set in exhaust pipe 51, for the vapor flow rate that monitor in real time exhaust pipe 51 is extracted.Controller
70 are carried out according to the monitored results and the network load of electricity generation system of flowmeter 60, the flow for first to fourth flow valve
Control, makes to be remained necessarily from the outlet steam of middle-pressure turbine 22.
In order to not influence the vapor flow rate of middle-pressure turbine, can be and the 4th stream by the flow set of the 3rd flow valve 56
Amount valve 57 is identical, i.e., the steam for being extracted from the export pipeline of reheater 10 is equal to by exhaust pipe to its increased steam, so that
Realize pressing whirlpool in increasing the pressure into reboiler 41 by the export pipeline of reheater 10 extraction steam, and will not reduce
The inlet flow rate of turbine 22.
The operation of power networks method of the electricity generation system of the embodiment of the present invention, including:Steam generator 6 generates high pressure high temperature vapor
And produce the exhaust with carbon dioxide, exhaust to be transported to carbon dioxide recovery plant 1b;Extracted by middle-pressure turbine 22
Remain a certain amount of vapor volume;At least a portion that steam will be extracted from middle-pressure turbine 22 by the 3rd valve 56 is conveyed
To reheater 10;Steam being extracted from reheater export pipeline, carbon dioxide recovery plant 1b is transported to by the 4th valve 57.Its
In:It is at full capacity or during higher load in the network load of electricity generation system, opens first flow valve 54, second flow valve
55, the 3rd flow valve 56, the 4th flow valve 57 are closed, first flow valve 54 and second flow valve 55 are controlled by control unit
Flow, makes the vapor volume extracted via middle-pressure turbine 22 remain necessarily, and reach the steaming of carbon dioxide recovery plant 1b
Gas is equal to or slightly above pressure needed for the normal work of reboiler 41;When network load is in moderate duty, close first-class
Amount valve 54, opens second flow valve 55, the 3rd flow valve 56, the 4th flow valve 57, makes the steaming extracted via middle-pressure turbine 22
Tolerance is remained necessarily, and the flow of the 3rd flow valve 56 is equal to the flow of the 4th flow valve 57, and the is controlled by by control unit
Two flow valves 55, the flow of the 3rd flow valve 56, make the steam of arrival carbon dioxide recovery plant 1b be equal to or slightly above weight
Pressure needed for the boiling normal work of device 41;When network load is in low load, first flow valve 54, second flow valve is closed
55, the 3rd flow valve 56, the 4th flow valve 57 are opened, the vapor volume extracted via middle-pressure turbine 22 is remained necessarily, adjust
The 3rd flow valve 56, the flow of the 4th flow valve 57 are saved, make the flow of the 4th flow valve 57 more than the flow of the 3rd flow valve 56,
So that the steam for reaching carbon dioxide recovery plant 1b is equal to or slightly above pressure needed for the normal work of reboiler 41.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.For the ordinary skill people of the art
For member, some improvements and modifications without departing from the principles of the present invention should be regarded as falling into protection scope of the present invention.