CN109282274B - A kind of liquid metal heat-transfer Turbo-generator Set and its working method - Google Patents
A kind of liquid metal heat-transfer Turbo-generator Set and its working method Download PDFInfo
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- CN109282274B CN109282274B CN201811358925.8A CN201811358925A CN109282274B CN 109282274 B CN109282274 B CN 109282274B CN 201811358925 A CN201811358925 A CN 201811358925A CN 109282274 B CN109282274 B CN 109282274B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/16—Controlling superheat temperature by indirectly cooling or heating the superheated steam in auxiliary enclosed heat-exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention provides a kind of liquid metal heat-transfer Turbo-generator Sets, including boiler, steam turbine, main steam afterburner is equipped between boiler and steam turbine, it further include liquid metal heat-transfer circuit, by main steam afterburner by the heat transfer from boiler to main steam, similar designs can also be used in the reheater of reheating embrittlement, by fluent metal loop reheated steam.Main steam afterburner is double-shell side U-tube heat exchanger, and shell side is steam, and tube side is metal, and inner walls are nearby equipped with heat shield.The present invention also provides the working methods of above-mentioned liquid metal heat-transfer Turbo-generator Set.700 DEG C of grade extra-supercritical units of the invention are not needed using nickel-base alloy is largely used, to reduce unit cost.
Description
Technical field
The present invention relates to a kind of liquid metal heat-transfer Turbo-generator Set and its working methods, belong to thermal power generation technology neck
Domain.
Background technique
Coal fired power generation is one of main power supply mode in China, will be occupied within current and considerably long one period from now on
Maximum generated energy share.In order to realize coal-fired power plant's upgrading synergy and high quality development, it is badly in need of 700 DEG C of grades of Accelerating The Construction
Advanced ultra supercritical steam turbine generating set.But the high-temperature component of 700 DEG C of advanced extra-supercritical units of grade is needed using novel
Nickel-base high-temperature material manufacture, the price is very expensive, and the cost of especially main steam line and heavy casting and forging steeply rises,
The cost for directly resulting in unit is excessively high, lacks investment advantage, and the construction plan of related Demonstration Station, which is in, in the world shelves shape
State.The key problem of above situation is the at high cost of high-temperature component material, how to avoid or reduce making for valuable nickel-base material
Dosage is the key that crack.
In the advanced ultra supercritical steam turbine generating set of 700 DEG C of grades, main steam line is main bugbear, main steam line
Size is big, length is long, materials are more, runs in 700 DEG C of grades, must use New Nickel-Based Alloy, cost is very high, and this pipe
The manufacturing process technology in road not yet full maturity.
Summary of the invention
The purpose of the present invention is: the advanced ultra supercritical steam turbine generating set of 700 DEG C of grades is more economically achieved.
In order to achieve the above object, there is provided a kind of liquid metal heat-transfer turbine generators for a technical solution of the invention
Unit, including boiler, main steam line and steam turbine, boiler export are connected with one end of main steam line, which is characterized in that also
Including main steam afterburner, the steam side-entrance of the other end connection main steam afterburner of main steam line, main steam afterburner
Steam side outlet be connected to steam turbine, the main steam lower than 700 DEG C of temperature grades is admitted to main steam via main steam line
Afterburner is re-fed into steam turbine after the main steam temperature concurrent heating that will be fed by main steam afterburner to 700 DEG C of grades.
It preferably, further include liquid metal heat-transfer circuit, the metal side of the main steam afterburner seals in the liquid metal
Heat transfer loop, liquid metal are heated liquid metal by the flue gas of the boiler in liquid metal heat-transfer circuit internal circulation flow
Gasification is metal vapors, and metal vapors exchanges heat in the main steam afterburner with main steam, will be less than 700 DEG C of temperature grades
While main steam concurrent heating is to 700 DEG C of grades, it is condensed into after liquid metal again by the flue gas gasification of the boiler, recycles past again
It is multiple.
Preferably, the liquid metal heat-transfer circuit includes liquid metal pump, the outlet connection liquid gold of liquid metal pump
Belong to heater inlet, liquid metal heater is arranged in the boiler, and the outlet of liquid metal heater connects the main steaming
The metal side-entrance of vapour afterburner, the import of the metal side outlet connection cooler of main steam afterburner, the outlet of cooler connects
Connect the import of liquid metal pump.
It preferably, further include reheater, after the metal vapors in the liquid metal heat-transfer circuit is sent into reheater simultaneously, In
Heat exchange is carried out with the steam of the steam turbine out in reheater, by steam reheating.
Preferably, the main steam afterburner and/or the reheater use double-shell side U-tube heat exchanger, lead in tube side
Enter the metal vapors, the main steam or the steam are passed through in shell side.
Preferably, the double-shell side U-tube heat exchanger includes shell and end socket, and tube sheet, shell are equipped between shell and end socket
Body and tube sheet are vapor cavity, are metal air cavity between end socket and tube sheet, and shell is equipped with the steam communicated with vapor cavity
Import and steam (vapor) outlet, end socket is equipped with the metal gas import communicated with metal air cavity and the outlet of metal gas, in vapor cavity
Interior to be equipped with U-tube, the both ends of U-tube are connected with metal air cavity.
Preferably, at least one layer of heat shield, heat shield and the shell and adjacent insulation are equipped in the vapor cavity
It is formed with gap between cover, is equipped with cooling steam import on the housing, cooling steam is passed through gap by cooling steam import
Cool down afterwards to the shell.
Preferably, shell internal partition is equipped at the middle part of the vapor cavity and the metal air cavity.
There is provided a kind of works of above-mentioned liquid metal heat-transfer Turbo-generator Set for another technical solution of the invention
Make method, which comprises the following steps:
Liquid metal is sent into liquid metal heater by liquid metal pump, will be in liquid metal heater by boiler smoke
Liquid metal heating, liquid metal gasified as metal vapors, and metal vapors inputs main steam afterburner, transfers heat to
Lower than the main steam of 700 DEG C of temperature grade, while by main steam concurrent heating to 700 DEG C of grades, metal vapors is condensed into liquid gold
Belonging to, liquid metal returns to liquid metal pump after subcooler is cooling, it moves in circles, at the same time, concurrent heating to 700 DEG C of grades
Main steam enters steam turbine.
Preferably, metal vapors all the way is extracted from the liquid metal heat-transfer circuit passes through reheater heating steam turbine
Turbine steam discharge, turbine steam discharge are re-fed into reheating embrittlement after being heated.
A kind of liquid metal heat-transfer Turbo-generator Set provided by the invention will by arranging heat exchanger before steam turbine
To 700 DEG C of grades, current material is can be used in the component before this heat exchanger for the main steam temperature concurrent heating of lower temperature grade, from
And it solves the above problems.
Compared with prior art, liquid metal heat-transfer Turbo-generator Set provided by the invention has the following beneficial effects:
1, the present invention can manufacture boiler, main steaming using existing ultra supercritical power station (600 DEG C/35MPa grade) material
The components such as steam pipe road are not needed before main steam afterburner using nickel-bass alloy material, and the shell of main steam afterburner is not required to
Nickel-base alloy is used, heat-transfer pipe can also not use nickel-base alloy, and main steam afterburner is between steam turbine, including steam turbine height
Temperature section may use nickel-base alloy, but dosage is limited, and generally the material cost of unit can be greatly reduced；
2, the internal pressure of fluent metal loop of the invention is the low pressure close to atmospheric pressure, is wanted to the intensity of pressure boundary material
Ask very low, service requirement can be met by generalling use austenitic stainless steel, so also not needing using high end materials.
3, the liquid metal of the invention heating and gasifying in boiler condenses in main steam afterburner or reheater, in pipe
Heat transfer coefficient is big, and manage it is outer be easy to take augmentation of heat transfer means (such as: extending heat-transfer surface with fin) to improve heat transfer coefficient, then may be used
High overall heat-transfer coefficient is obtained, to realize compact heat exchanger.
4, liquid metal of the invention can be selected sodium, and sodium is as coolant for nuclear power fast reactor, and sodium is also as a heat transfer medium
For dish-style Photospot solar thermal electric generator, and as working medium for Alkali metal thermoelectric converter, etc., these applications are equal
Sufficient operating experience can be provided for fluent metal loop of the invention, the cost of Liquid Sodium heat transfer loop is controllable.
5, fluent metal loop of the invention can also be used for the reheating of steam, for reducing reheaing steam pipe length and height
Hold material utilization amount all highly beneficial.
Detailed description of the invention
Fig. 1 is the schematic diagram of liquid metal heat-transfer steam turbine generator set system boiler and steam turbine part, in figure:
1- boiler, 2- main steam line, 3- main steam afterburner, 4- main steam line high temperature section, 5- high pressure turbine, 6- mono-
Cold section of secondary reheaing steam pipe, 7- single reheat device, 8- single reheat jet chimney hot arc, 9- intermediate pressure turbine, 10- double reheat
Cold section of jet chimney, 11- secondary reheater, 12- double reheat jet chimney hot arc, 13- low pressure turbine, 14- sodium pump, 15- sodium
Heater, 16- sodium cooling device.
Fig. 2 is the double-shell side U-tube heat exchanger schematic diagram of main steam afterburner, single reheat device, secondary reheater, figure
In:
21- cooling steam import, 22- shell, 23- heat shield, 24-U shape pipe, 25- shell internal partition, 26- steam inlet,
27- steam (vapor) outlet, 28- tube sheet, 29- end socket, 30- end socket internal partition, 31- sodium import, the outlet of 32- sodium.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Liquid metal heat-transfer Turbo-generator Set provided by the invention is to increase liquid in conventional Turbo-generator Set
Sodium heat transfer loop, the main steaming of the heat of condensation of high temperature Sodium vapour in the air intake close to high pressure turbine, intermediate pressure turbine and low pressure turbine
Vapour afterburner, single reheat device and secondary reheater are released to main steam, single reheat steam and double reheat steam.
As shown in Figure 1, the outlet of boiler 1 connects the 3 steam side-entrance of main steam afterburner through main steam pipe 2, main steam is mended
Hot 3 steam side outlet of device connects 5 import of high pressure turbine through main steam line high temperature section 4, and the outlet of high pressure turbine 5 is steamed through single reheat
The 7 steam side-entrance of connection single reheat device of cold section 6 of steam pipe road, 7 steam side outlet of single reheat device is through single reheat jet chimney
Hot arc 8 connects 9 import of intermediate pressure turbine, and intermediate pressure turbine 9 is exported through cold section 10 connection secondary reheater 11 of double reheat jet chimney
Steam side-entrance, 11 steam side outlet of secondary reheater connect 13 import of low pressure turbine through double reheat jet chimney hot arc 12.
The main steam afterburner 3, single reheat device 7, secondary reheater 11 are respectively as close as possible to the high pressure turbine of steam turbine 5, middle pressure
Turbine 9, low pressure turbine 13 are arranged.
The outlet of sodium pump 14 connection 15 import of sodium heater, sodium heater 15 are arranged in boiler 1, the outlet point of sodium heater 15
Three tunnels: the first via connects the 3 sodium side-entrance of main steam afterburner, and the second tunnel connects the 7 sodium side-entrance of single reheat device, the connection of third road
11 sodium side-entrance of secondary reheater, main steam afterburner 3, single reheat device 7,11 sodium side outlet of secondary reheater converge connection sodium
16 sodium side-entrance of cooler, 16 sodium side outlet of sodium cooling device connect 14 import of sodium pump.
Main steam afterburner 3, single reheat device 7, secondary reheater 11 are double-shell side U-tube heat exchanger, and shell 22 pushes up
Portion is provided with cooling steam import 21, and heat shield 23, heat shield is nearby arranged close to 22 inner wall of shell between shell 22 and U-tube 24
23 steam (vapor) outlet is connected to the steam inlet 26 of shell 22, and the steam (vapor) outlet 27 of the steam (vapor) outlet of heat shield 23 and shell 22 is not
It is connected to, distribution aperture is equipped with shell internal partition 25, steam inlet 26 and steaming to balance two sides pressure difference on heat shield 23 among shell 22
Vapor outlet 27 is located at 25 two sides of shell internal partition, and U-tube 24 passes through tube sheet 28, and tube sheet 28 is connect with shell and end socket 29, end socket 29
Centre is equipped with end socket internal partition 30, and the sodium import 31 of end socket 29 and sodium outlet 32 are located at 30 two sides of end socket internal partition.
The specific implementation step of above-mentioned liquid metal heat-transfer Turbo-generator Set is as follows:
Sodium is sent into sodium heater 15 by sodium pump 14, by the saturation sodium vapor of 1 flue gas of boiler to 780 DEG C, wherein the
Sodium vapor inputs main steam afterburner 3 all the way, transfers heat to steam, and condense into liquid, sodium is through subcooler 16 into one
Sodium pump 14, cooling medium of one water supply of boiler 1 as cooler 16 are returned to after step is cooling.600 DEG C from boiler 1/
35MPa steam enters main steam afterburner 3 through main steam line 2,750 DEG C is heated to, then through main steam line high temperature section 4
Into high pressure turbine 5,5 steam discharge of high pressure turbine enters single reheat device 7 through cold section 6 of single reheat jet chimney, heats from sodium
Single reheat steam is heated on second tunnel of the Sodium vapour of device 15, and steam enters intermediate pressure turbine through single reheat jet chimney hot arc 8
9,9 steam discharge of intermediate pressure turbine enters secondary reheater 11 through cold section 10 of double reheat jet chimney, and the sodium from sodium heater 15 steams
Double reheat steam is heated on the third road of vapour, and steam enters low pressure turbine 13 through double reheat jet chimney hot arc 12.
Main steam afterburner 3, single reheat device 7, secondary reheater 11 double-shell side U-tube heat exchanger in, come from machine
One Low Temperature Steam in group system enters the gap between shell 22 and heat shield 23,22 wall of shell through cooling steam import 21
Temperature keeps 500 DEG C or less the ferritic steels to use lower cost, and cooling steam converges with the steam entered from steam inlet 26
It closes and enters 25 side of shell internal partition and the heat exchange of U-tube 24, U-tube bears steam external pressure, the austenite of high chrome high-nickel can be used not
Become rusty steel thick-walled pipe, and U-tube can be entered back into 25 other side of shell internal partition and be changed with U-tube 24 by fin and baffle plate augmentation of heat transfer
Heat, the steam after heating are discharged from steam (vapor) outlet 27, and high temperature Sodium vapour enters the end socket internal partition 30 of end socket 29 from sodium import 31
Side across U-tube 24 and exchanges heat, and then reaches 30 other side of end socket internal partition of end socket 29, from 32 discharge of sodium outlet.Double
In shell side U-tube heat exchanger, steam and sodium flow direction are adverse current, advantageously reduce heat exchange area.
According to above-described embodiment, unit can reach 700 DEG C of grade ultra supercritical parameters, and not need using a large amount of nickel
Base alloy material, pump wasted work in liquid metal heat-transfer circuit is smaller to be not significantly affected by unit efficiency, in 700 DEG C of class parameters
Under, Turbo-generator Set of the invention can realize expected generating efficiency.
Claims (10)
1. a kind of liquid metal heat-transfer Turbo-generator Set, including boiler, main steam line and steam turbine, boiler export and main steaming
The one end in steam pipe road is connected, which is characterized in that further includes main steam afterburner, the other end connection main steam of main steam line is mended
The steam side outlet of the steam side-entrance of hot device, main steam afterburner is connected to steam turbine, lower than the main steaming of 700 DEG C of temperature grade
Vapour is admitted to main steam afterburner via main steam line, the main steam temperature concurrent heating that will be fed by main steam afterburner to 700
Steam turbine is re-fed into after DEG C grade.
2. a kind of liquid metal heat-transfer Turbo-generator Set as described in claim 1, which is characterized in that further include liquid metal
Heat transfer loop, the metal side of the main steam afterburner seal in the liquid metal heat-transfer circuit, and liquid metal is passed in liquid metal
Hot loop internal circulation flow, by the boiler flue gas by liquid metal heating and gasifying be metal vapors, metal vapors is described
It is exchanged heat in main steam afterburner with main steam, while will be less than the main steam concurrent heating of 700 DEG C of temperature grades to 700 DEG C of grades,
Again it is condensed into after liquid metal again by the flue gas gasification of the boiler, moves in circles.
3. a kind of liquid metal heat-transfer Turbo-generator Set as claimed in claim 2, which is characterized in that the liquid metal passes
Hot loop includes liquid metal pump, and the outlet of liquid metal pump connects liquid metal heater inlet, liquid metal heater cloth
It is placed in the boiler, the outlet of liquid metal heater connects the metal side-entrance of the main steam afterburner, and main steam is mended
The import of the metal side outlet connection cooler of hot device, the import of the outlet connection liquid metal pump of cooler.
4. a kind of liquid metal heat-transfer Turbo-generator Set as claimed in claim 2, which is characterized in that it further include reheater,
After the metal vapors in the liquid metal heat-transfer circuit is sent into reheater simultaneously, in reheater with the steam of the steam turbine out
Heat exchange is carried out, by steam reheating.
5. a kind of liquid metal heat-transfer Turbo-generator Set as claimed in claim 4, which is characterized in that the main steam concurrent heating
Device and/or the reheater use double-shell side U-tube heat exchanger, are passed through the metal vapors in tube side, are passed through in shell side described
The steam of main steam or the steam turbine out.
6. a kind of liquid metal heat-transfer Turbo-generator Set as claimed in claim 5, which is characterized in that the double-shell side U-shaped
Heat exchange of heat pipe includes shell and end socket, and tube sheet is equipped between shell and end socket, and shell and tube sheet are vapor cavity, end socket and tube sheet
Between be metal air cavity, shell is equipped with the steam inlet and steam (vapor) outlet that communicate with vapor cavity, and end socket is equipped with and gold
Belong to the import of metal gas and the outlet of metal gas that air cavity communicates, U-tube, the both ends of U-tube and metal are equipped in vapor cavity
Air cavity is connected.
7. a kind of liquid metal heat-transfer Turbo-generator Set as claimed in claim 6, which is characterized in that in the vapor cavity
It is interior to be equipped at least one layer of heat shield, gap is formed between heat shield and the shell and adjacent insulation cover, on the housing
Equipped with cooling steam import, cooling steam is passed through behind gap by cooling steam import cools down to the shell.
8. a kind of liquid metal heat-transfer Turbo-generator Set as claimed in claim 6, which is characterized in that in the vapor cavity
And the middle part of the metal air cavity is equipped with shell internal partition.
9. a kind of working method of liquid metal heat-transfer Turbo-generator Set as claimed in claim 3, which is characterized in that including
Following steps:
Liquid metal is sent into liquid metal heater by liquid metal pump, by boiler smoke by the liquid in liquid metal heater
State METAL HEATING PROCESS, liquid metal are gasified as metal vapors, and metal vapors inputs main steam afterburner, are transferred heat to and are lower than
The main steam of 700 DEG C of temperature grade, while by main steam concurrent heating to 700 DEG C of grades, metal vapors is condensed into liquid metal, liquid
State metal returns to liquid metal pump after subcooler is cooling, moves in circles, at the same time, main steaming of the concurrent heating to 700 DEG C of grades
Vapour enters steam turbine.
10. a kind of working method as claimed in claim 9, which is characterized in that extracted from the liquid metal heat-transfer circuit
Metal vapors heats the turbine steam discharge of steam turbine by reheater all the way, and turbine steam discharge is re-fed into reheating embrittlement after being heated.
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| CN201811358925.8A CN109282274B (en) | 2018-11-15 | 2018-11-15 | A kind of liquid metal heat-transfer Turbo-generator Set and its working method |
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| CN201811358925.8A CN109282274B (en) | 2018-11-15 | 2018-11-15 | A kind of liquid metal heat-transfer Turbo-generator Set and its working method |
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| CN109282274B true CN109282274B (en) | 2019-11-29 |
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| CN104763485B (en) * | 2014-04-30 | 2016-04-27 | 南京博沃科技发展有限公司 | A kind of concurrent heating type ultrahigh pressure/subcritical back pressure thermal power plant unit thermodynamic system |
| CN107143841A (en) * | 2017-05-22 | 2017-09-08 | 大唐(北京)能源管理有限公司 | The comprehensive improvement system of desulfurization wastewater and thermal flue gas under a kind of running on the lower load |
| CN107191907A (en) * | 2017-07-25 | 2017-09-22 | 刘绍允 | Increase production gas turbine electricity/steam co-producing system of steam using smoke discharging residual heat |
| CN108518324B (en) * | 2018-03-20 | 2021-01-05 | 华北电力大学 | Tower type solar thermal coupling coal-fired power generation system with energy storage function |
| CN209027308U (en) * | 2018-06-22 | 2019-06-25 | 云南天朗能源科技有限公司 | A kind of low-temperature flue gas waste heat recycling dragging system of efficient stable |
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