CN105371267B - The Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air - Google Patents
The Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air Download PDFInfo
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- CN105371267B CN105371267B CN201510947201.7A CN201510947201A CN105371267B CN 105371267 B CN105371267 B CN 105371267B CN 201510947201 A CN201510947201 A CN 201510947201A CN 105371267 B CN105371267 B CN 105371267B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
- F22D1/38—Constructional features of water and air preheating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/40—Combinations of exhaust-steam and smoke-gas preheaters
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- General Engineering & Computer Science (AREA)
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Abstract
The present invention relates to a kind of Double reheat steam turbine backheat energy utility systems of heating boiler primary and secondary air, and hot cell, air preheat unit, condensation water heating unit, feedwater deaeration heating unit, feedwater heating unit, primary air fan, overfire air fan, boiler furnace and coal pulverizer are crossed including turbine LP rotors unit, flue gas unit, air.The present invention removes the indispensable air preheater of conventional boiler design, the air feed of primary air fan and overfire air fan is heated using the steam extractions at different levels of steam turbine, it is equivalent to and arranges one group of heater parallel with condensation water heating unit and feedwater heating unit, it is greatly expanded the backheat range of unit, reduce the cold source energy of steam turbine, the secondary air temperature greatly improved using the degree of superheat of steam extractions at different levels, enhance boiler combustion, the stability that boiler catches fire when enhancing performing low-load running of machine set, it is effectively utilized the heat of Steam Turbine Regenerative System, reduce boiler oil consumption.
Description
Technical field
The present invention relates to reheat steam turbine regenerative steam and boiler tail flue gas energy use technology field, more particularly to
A kind of Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air.
Background technology
With the development of economy, demand of the society to electric power constantly increases, to environmental protection pay attention to day by day.China about 70%
More than electric power is generated by coal fired power plant, and the capacity usage ratio of coal fired power plant is low at present, and most heat is discharged into environment.
Wherein steam turbine efficiency of thermal cycle is low, and cold source energy accounts for more than half of thermodynamic cycle loss；In every loss of boiler,
Heat loss due to exhaust gas accounts for more than 70% boiler whole heat loss.
The air preheater import and export wind-warm syndrome of general boiler design is respectively 20 DEG C and 310 DEG C or so, import and export smoke temperature
Respectively 350 DEG C and 120 DEG C or so.Although air preheater upper end difference only has 40 DEG C, heat transfer temperature difference is very big, therefore conducts heat not
Reversible loss is very big.Air preheater, which is inevitably present, to leak out and clogging phenomenon, boiler efficiency is caused to decline, pressure fan
Increase with air-introduced machine power consumption.
Using double reheat technology, unit efficiency can be effectively improved, energy consumption is reduced, reduces pollutant emission, be firepower hair
Motor group realizes energy-saving, clean environment firendly effective technology means.Double reheat power generation sets generally select higher initial conditions, make
The series of heat regenerative system increases to 9 grades or 10 grades by 8 grades of conventional system.Higher initial conditions mean higher steam extraction ginseng
Number, the degree of superheat of steam extraction at different levels significantly increases compared with single reheat unit.Steam extraction increases with condensation water and the heat transfer temperature difference of feedwater
Greatly, heat transfer irreversible loss increases therewith.Steam decrease beyond the speed of temperature decline in each cylinder acting of steam turbine, pressure,
Therefore steam extraction enthalpy and exhaust enthalpy are typically much deeper than the Steam Turbine of single reheat, even with backheat series more again, low-temperature receiver damage
Mistake increases therewith.
If double reheat Turbo-generator Set design feed temperature can cause boiler water wall local more than 315 DEG C
Temperature is excessively high, it has to select the material of greater degree, construction period scene needs special equipment welding water-cooling wall, increases
The cost of investment of water-cooling wall.Feed temperature is excessively high in order to prevent during operating mode at full capacity, it has to increase first order steam extraction crushing, by
This causes the regenerative steam energy of high parameter that can not be utilized effectively.
In the actual motion of boiler, due to the influence of the factors such as heating surface ash dirt, exhaust gas temperature is often higher than
Design temperature can not only reduce boiler efficiency, increase coal consumption；The dust emission concentration of deduster can also be increased, cause environment
Pollution.To meet the operating temperature requirements of low temperature electric precipitator, newly-designed unit selects to install low-level (stack-gas) economizer (cigarette water additional one after another
Heat exchanger) recovered flue gas heat.Since smoke temperature is relatively low, often can only the relatively low condensation water of heating temperature, the Btu utilization of recycling
It is inefficient.
Invention content
Based on this, the defects of the invention reside in the prior art is overcome, provide a kind of heating boiler primary and secondary air it is secondary again
Hot gas turbine backheat energy utility system eliminates traditional air preheater, realizes the backheat degree of increase steam turbine, reduces
While the cold source energy of steam turbine, and boiler discharge flue-gas temperature is reduced, realize the step to boiler tail flue gas energy
It utilizes, is utilized by extracted steam from turbine heat and the coupling of boiler smoke heat depth, improve the energy conversion efficiency of coal unit.
The object of the present invention is achieved like this：
The Double reheat steam turbine backheat energy utility system of a kind of heating boiler primary and secondary air, including steam turbine power generation
Train unit, flue gas unit, air cross hot cell, air preheat unit, feedwater heating unit, feedwater deaeration heating list
Member, condensation water heating unit, primary air fan, overfire air fan, boiler furnace and coal pulverizer；
The turbine LP rotors unit and the air cross hot cell, the air preheat unit, the feedwater plus
Hot cell, the feedwater deaeration heating unit and the condensation water heating unit are all connected with；
The condensation water heating unit, the feedwater deaeration heating unit and the feedwater heating unit add with the flue gas
The water side of hot cell is connected in parallel, and the condensation water heating unit, the feedwater deaeration heating unit and the feedwater heating
Vapour side of the vapour side of unit respectively with the air preheat unit is connected in parallel, and the air preheat unit is overheated with the air
The gas side of unit is connected in series with；
The primary air fan crosses hot cell with the air preheat unit, the air and the coal pulverizer is sequentially connected,
The overfire air fan crosses hot cell with the air preheat unit, the air and the boiler furnace is sequentially connected.
Further technical solution is illustrated below：
Further, the turbine LP rotors unit includes ultra-high pressure cylinder, and the air crosses hot cell and includes first
Vapour hot-air heater, the air preheat unit include first single pressure steam air heater, and the feedwater heating unit includes the series connection of water side
First high-pressure heater and the second high-pressure heater；
The ultra-high pressure cylinder is connect with the first vapour hot-air heater, the vapour side outlet of the first vapour hot-air heater with
The vapour side-entrance of first high-pressure heater and described first single pressure steam air heater connects, and first high-pressure heater and institute
It states after first single pressure steam air heater is connected in parallel and is connect with second high-pressure heater.
Further, the turbine LP rotors unit further includes high pressure cylinder, and the air crosses hot cell and further includes
Second Automobile Works's hot-air heater, the air preheat unit further include second single pressure steam air heater, and the feedwater heating unit further includes third
High-pressure heater；
The high pressure cylinder is connect with the second vapour hot-air heater, and the vapour side outlet of the second vapour hot-air heater is and institute
The vapour side-entrance for stating the second high-pressure heater and described second single pressure steam air heater connects, and second high-pressure heater with it is described
Second single pressure steam air heater is connect after being connected in parallel with the third high-pressure heater.
Further, the air crosses hot cell and further includes third vapour hot-air heater, and the air preheat unit further includes
First pair of pressure steam air heater, the feedwater heating unit further include the 4th high-pressure heater；
The high pressure cylinder is connect with the third vapour hot-air heater, and the vapour side outlet of the third vapour hot-air heater is and institute
The vapour side-entrance for stating third high-pressure heater and first pair of pressure steam air heater connects, and the third high-pressure heater with it is described
First pair of pressure steam air heater is connect after being connected in parallel with the 4th high-pressure heater.
Further, the air crosses hot cell and further includes the 4th vapour hot-air heater, and the air preheat unit further includes
Second pair of pressure steam air heater, the feedwater heating unit further include the 4th high-pressure heater；
The high pressure cylinder is connect with the 4th vapour hot-air heater, and the vapour side outlet of the 4th vapour hot-air heater is and institute
The vapour side-entrance for stating the 4th high-pressure heater and second pair of pressure steam air heater connects, and the 4th high-pressure heater with it is described
Second pair of pressure steam air heater is connect after being connected in parallel with the feedwater deaeration heating unit.
Further, small turbine and intermediate pressure cylinder are further included, the air crosses hot cell and further includes the 5th vapour hot-air heater,
The air preheat unit further includes the double pressure steam air heaters of third；
Medium pressure cylinder is connect with the 5th vapour hot-air heater, and the vapour side outlet of the 5th vapour hot-air heater is and institute
State the vapour side-entrance connection of the double pressure steam air heaters of feedwater deaeration heating unit, the small turbine and the third, and the feedwater
Deoxygenation heating unit is connect after being connected in parallel with the double pressure steam air heaters of the third with the 4th high-pressure heater.
Further, feed pump and feed-regulating valve are further included, the flue gas unit includes high temperature cigarette water- to-water heat exchanger,
And the boiler furnace is connect with the fume side of the high temperature cigarette water- to-water heat exchanger, the feedwater heating unit and the high temperature cigarette water
Heat exchanger is connect after being connected in parallel with the feed pump, and the feed-regulating valve is series at the feed pump and the feedwater heating
Between unit.
Further, the air crosses hot cell and further includes the 6th vapour hot-air heater, the 7th vapour hot-air heater and the first gas
Warm regulating valve, the air preheat unit further include the 4th pair of pressure steam air heater, and the condensation water heating unit includes the first low pressure
Heater and the second low-pressure heater；
Medium pressure cylinder, the 6th vapour hot-air heater and the 7th vapour hot-air heater are sequentially connected, first gas
Warm regulating valve is connected in parallel in the vapour side both ends of the 7th vapour hot-air heater, and the vapour side outlet of the 7th vapour hot-air heater is equal
Vapour side-entrance with first low-pressure heater and the 4th pair of pressure steam air heater is connect, and first low-pressure heater with
The 4th pair of pressure steam air heater is connect after being connected in parallel with second low-pressure heater.
Further, the air crosses hot cell and further includes the 8th vapour hot-air heater and the second temperature regulating valve, the sky
Gas preheating unit further includes the 5th pair of pressure steam air heater, and the condensation water heating unit further includes third low-pressure heater；
Medium pressure cylinder is connect with the 8th vapour hot-air heater, and the second temperature regulating valve is connected in parallel in described
The vapour side both ends of eight vapour hot-air heaters, the vapour side outlet of the 8th vapour hot-air heater with second low-pressure heater and institute
State the vapour side-entrance connection of the 5th pair of pressure steam air heater, and second low-pressure heater company in parallel with the 5th pair of pressure steam air heater
It is connect after connecing with the third low-pressure heater.
Further, the first condensate booster pump, the second condensate booster pump, medium temperature cigarette water- to-water heat exchanger and low temperature are further included
Cigarette water- to-water heat exchanger, the outlet of first condensate booster pump connect the low temperature cigarette water- to-water heat exchanger, first low-pressure heating
Device is connected in parallel after being connected in series with second low-pressure heater with the low temperature cigarette water- to-water heat exchanger, second condensation water
The outlet of booster connects the medium temperature cigarette water- to-water heat exchanger, and the feedwater deaeration heating unit and the medium temperature cigarette water- to-water heat exchanger are simultaneously
Connection connection, the feedwater heating unit are connected in parallel with the high temperature cigarette water- to-water heat exchanger.
Low pressure (LP) cylinder is further included, the air preheat unit further includes double calm the anger water- to-water heat exchanger and third condensate booster pumps,
The condensation water heating unit further includes the 4th low-pressure heater, the low pressure (LP) cylinder with the third low-pressure heater and described
4th low-pressure heater connects, the 4th low-pressure heater, the third low-pressure heater, the third condensate booster pump
And double water- to-water heat exchangers of calming the anger recycle connection successively.
Compared with prior art, the invention has the advantages that：
1st, the present invention removes the indispensable air preheater of conventional boiler design, thus there is no contact heat exchange in system
Air preheater completely eliminates air-heater leakage and clogging phenomenon, reduces the wasted work of air-introduced machine, while institute of the present invention
The air feed of primary air fan and the overfire air fan is stated respectively by independent channel, is not in contact with each other, completely eliminates First air leakage
Toward the possibility of Secondary Air.
2nd, using steam turbine steam extractions at different levels heating First airs and the Secondary Air, be equivalent to condensation water heating unit, to
Water deoxygenation heating unit and feedwater heating unit arrange one group of heater parallel, are greatly expanded the backheat range of unit,
Reduce the cold source energy of steam turbine.
3rd, secondary air temperature greatly improved using the degree of superheat of steam extractions at different levels, enhances boiler combustion, it is low to enhance unit
The stability that boiler catches fire during load operation is effectively utilized the heat of Steam Turbine Regenerative System, reduces boiler oil consumption.
4th, at present using externally arranged steam cooler heating feedwater scheme compared with, boiler feed temperature of the invention compared with
It is low, economizer exit flue-gas temperature can be reduced, improves capacity usage ratio, while boiler feed temperature is controlled in zone of reasonableness
It is interior, the cost of boiler water wall, steam air heater and vapour hot-air heater pipe lateral pressure can be reduced and shell pressure is far below external
Steam condenser can effectively reduce heat exchanger cost.
Description of the drawings
Fig. 1 is the Double reheat steam turbine backheat energy utilization of the heating boiler primary and secondary air described in the embodiment of the present invention
The structure diagram of system；
Fig. 2 is the Double reheat steam turbine backheat energy utilization of the heating boiler primary and secondary air described in the embodiment of the present invention
The structure diagram of another embodiment of system.
Reference sign：
100th, turbine LP rotors unit, 110, ultra-high pressure cylinder, 120, high pressure cylinder, 130, intermediate pressure cylinder, 140, low pressure (LP) cylinder,
200th, flue gas unit, 220, high temperature cigarette water- to-water heat exchanger, 240, medium temperature cigarette water- to-water heat exchanger, 260, low temperature cigarette water- to-water heat exchanger,
300th, air crosses hot cell, the 310, first vapour hot-air heater, the 320, second vapour hot-air heater, and 330, third vapour hot-air heater,
340th, the 4th vapour hot-air heater, the 350, the 5th vapour hot-air heater, the 360, the 6th vapour hot-air heater, the 370, the 7th vapour hot-air heater,
370a, the first temperature regulating valve, the 380, the 8th vapour hot-air heater, 380a, the second temperature regulating valve, 400, air preheat unit,
410th, first single pressure steam air heater, 420, second single pressure steam air heater, 430, first pairs of pressure steam air heaters, 440, second pairs of pressure steam air heaters,
450th, the double pressure steam air heaters of third, 460, the 4th pairs of pressure steam air heaters, 470, the 5th pairs of pressure steam air heaters, 480, double water- to-water heat exchangers of calming the anger,
490th, third condensate booster pump, 500, feedwater heating unit, the 510, first high-pressure heater, the 520, second high-pressure heater,
530th, third high-pressure heater, the 540, the 4th high-pressure heater, 600, feedwater deaeration heating unit, 700, condensation water heating it is single
Member, the 710, first low-pressure heater, the 720, second low-pressure heater, 730, third low-pressure heater, the 740, the 4th low-pressure heating
Device, 800, primary air fan, 900, overfire air fan, 900a, feed pump, 900b, feed-regulating valve, 900c, the boosting of the first condensation water
Pump, 900d, the second condensate booster pump, 920, small turbine, 960, condenser, 970, condensate pump, 980, gland heater,
1000th, boiler furnace, 1200, coal pulverizer.
Specific embodiment
The embodiment of the present invention is described in detail below：
As shown in Figure 1, a kind of Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air, including
Turbine LP rotors unit 100, flue gas unit 200, air cross hot cell 300, air preheat unit 400, feedwater plus
Hot cell 500, feedwater deaeration heating unit 600, condensation water heating unit 700, primary air fan 800, overfire air fan 900, boiler
Burner hearth 1000 and coal pulverizer 1200；
The turbine LP rotors unit 100 crosses hot cell 300, the air preheat unit 400, institute with the air
Feedwater heating unit 500, the feedwater deaeration heating unit 600 and the condensation water heating unit 700 is stated to be all connected with；
The condensation water heating unit 700, the feedwater deaeration heating unit 600 and it is described feedwater heating unit 500 with
The water side of the flue gas unit 200 is connected in parallel, and the heating of the condensation water heating unit 700, the feedwater deaeration is single
Vapour side of the vapour side of member 600 and the feedwater heating unit 500 respectively with the air preheat unit 400 is connected in parallel, described
The gas side that air preheat unit 400 crosses hot cell 300 with the air is connected in series with；
The primary air fan 800 crosses hot cell 300 and the coal pulverizer with the air preheat unit 400, the air
1200 are sequentially connected, and the overfire air fan 900 crosses hot cell 300 and the pot with the air preheat unit 400, the air
Stove burner hearth 1000 is sequentially connected.
Wherein, the Double reheat steam turbine backheat energy utility system of above-mentioned heating boiler primary and secondary air has with one
It is illustrated for the double reheat power generation sets of nine grades of regenerative steams.One of innovative point of the present invention is that its cancellation is traditional
Air preheater crosses hot cell 300, the air preheat list by the turbine LP rotors unit 100 and the air
Member 400, the condensation water heating unit 700, the feedwater deaeration heating unit 600 and the feedwater heating unit 500 connect,
The air is made full use of to cross the steam extractions at different levels heating primary air fan 800 of hot cell 300 and the confession of the overfire air fan 900
Wind improves the secondary air temperature into the boiler furnace 1000, boiler combustion is enhanced, when enhancing performing low-load running of machine set
The stability that boiler catches fire is effectively utilized the heat of Steam Turbine Regenerative System, reduces boiler oil consumption, while be also institute
State feedwater heating unit 500 and the feedwater deaeration heating unit 600 heating feedwater and for the condensation water heating unit 700
Heat-setting water.
On the other hand, the low pressure (LP) cylinder 140 is connect with the condensation water heating unit 700, utilizes the low pressure (LP) cylinder 140
Each grade low-temp steam extraction elder generation heat-setting water, then with condensation water heating temperature relatively low First air and Secondary Air, originally heating is primary
The gas energy of wind and Secondary Air is divided into multistage, and for the higher feedwater of heating temperature and condensation water, reducing heat transfer can not
Inverse loss.
In addition, it is heated by the flue gas unit 200 and the condensation water heating unit 700, the feedwater deaeration
Unit 600 and the feedwater heating unit 500 are connected in parallel, and the condensation water heating unit 700, the feedwater deaeration heat
Unit 600 is connected in parallel after connecting with the feedwater heating unit 500 with the air preheat unit 400, the air preheat
Unit 400, the air are crossed hot cell 300 and are sequentially connected with the boiler furnace 1000.The present invention is returned by using steam turbine
Secondary Air is heated in hot steam extraction, improves secondary air temperature as far as possible, the flue gas heat of the flue gas unit 200 so as to replace
It feeds water to heat the partial coagulation water of higher temperature and part, further by the gas energy of the flue gas unit 200 profit
With on higher energy level.To sum up, by rearranging Thermal generation unit therrmodynamic system, unit warp is greatly improved so as to reach
The purpose of Ji property, each section of steam extraction are completed not destroying original nine grades of regenerative steam heat-setting while heating the step of air
Water and the purpose of feedwater.
Above-mentioned flue gas unit 200 specifically includes high temperature cigarette water- to-water heat exchanger 220, medium temperature cigarette water- to-water heat exchanger 240 and low
Warm cigarette water- to-water heat exchanger 260, the primary air fan 800 are connect with coal pulverizer 1200, and high temperature air is supplied for heating coal dust for it,
In addition, the present invention removes the indispensable air preheater of conventional boiler design, thus there is no the air of contact heat exchange in system
Preheater completely eliminates air-heater leakage and clogging phenomenon, reduces the wasted work of air-introduced machine, while of the present invention one
The air feed of secondary wind turbine 800 and the overfire air fan 900 by independent channel, is not in contact with each other respectively, completely eliminates First air
Leak the possibility toward Secondary Air.
It is illustrated in figure 2 the Double reheat steam turbine of the heating boiler primary and secondary air of another embodiment of the invention
The layout drawing of backheat energy utility system is that the air crosses hot cell with the difference of above preferred embodiment
The 300 multiple vapour hot-air heaters included, for being connected in series with scheme, are arranged using connection mode in parallel by throttle (steam) temperature height
Row, the low steam extraction of temperature introduce the vapour hot-air heater of First air upstream, and the vapour gas that the high steam extraction of temperature introduces First air downstream adds
Hot device.And for the scheme of being connected in parallel, vapour hot-air heater can be divided into three groups, every group of two vapour hot-air heaters, with two vapour of group
Hot-air heater throttle (steam) temperature is roughly equal.
The turbine LP rotors unit 100 includes ultra-high pressure cylinder 110, and the air crosses hot cell 300 and includes first
Vapour hot-air heater 310, the air preheat unit 400 include first single pressure steam air heater 410, and the feedwater heating unit 500 wraps
Include the first high-pressure heater 510 and the second high-pressure heater 520 of water side series connection；
The ultra-high pressure cylinder 110 is connect with the first vapour hot-air heater 310, the vapour of the first vapour hot-air heater 310
Vapour side-entrance of the side outlet with first high-pressure heater 510 and first single pressure steam air heater 410 is connect, and described the
One high-pressure heater 510 is connect after being connected in parallel with described first single pressure steam air heater 410 with second high-pressure heater 520.
Wherein, the steam discharge of the ultra-high pressure cylinder 110 has the higher degree of superheat, first passes through the first vapour hot-air heater
The higher First air of 310 heating temperatures presses the higher First air of 410 heating temperature of steam air heater, together by the described first list again later
The first high-pressure heaters of Shi Suoshu 510 and first single pressure steam air heater 410 export it is hydrophobic converge it is latter with entering described the
The high feedwater of two high-pressure heaters, 520 heating temperature time, so as to fulfill the steam heat step extracted out from the ultra-high pressure cylinder 110
For heating air and feedwater, the utilization ratio of extracted steam from turbine is substantially increased, reduces the cold source energy of steam turbine.
Further, the turbine LP rotors unit 100 further includes high pressure cylinder 120, and the air crosses hot cell 300
The second vapour hot-air heater 320 is further included, the air preheat unit 400 further includes second single pressure steam air heater 420, and the feedwater adds
Hot cell 500 further includes third high-pressure heater 530；
The high pressure cylinder 120 is connect with the second vapour hot-air heater 320, the vapour side of the second vapour hot-air heater 320
Vapour side-entrance of the outlet with second high-pressure heater 520 and second single pressure steam air heater 420 is connect, and described second
High-pressure heater 520 and second single pressure steam air heater 420 are connect after being connected in parallel with the third high-pressure heater 530.
Wherein, the 2nd grade of first order steam extraction of the steam extraction from high pressure cylinder described in steam turbine 120 has the very high degree of superheat, first
It is heated by the 320 highest Secondary Air of heating temperature of the second vapour hot-air heater, then by described second single pressure steam air heater 420
The higher Secondary Air of temperature, while enter the high feedwater of corresponding second high-pressure heater, 520 heating temperature time, so as to real
The steam heat step now extracted out from the high pressure cylinder 120 is used to heat air and feedwater, substantially increases extracted steam from turbine
Utilization ratio reduces the cold source energy of steam turbine.
The air crosses hot cell 300 and further includes third vapour hot-air heater 330, and the air preheat unit 400 further includes
First pair of pressure steam air heater 430, the feedwater heating unit 500 further include the 4th high-pressure heater 540；
The high pressure cylinder 120 is connect with the third vapour hot-air heater 330, the vapour side of the third vapour hot-air heater 330
The vapour side-entrance with the third high-pressure heater 530 and first pair of pressure steam air heater 430 is exported to connect, and the third
High-pressure heater 530 is connect after being connected in parallel with first pair of pressure steam air heater 430 with the 4th high-pressure heater 540.
Wherein, second level steam extraction of the 3rd level steam extraction from high pressure cylinder described in steam turbine 120, and it has very high overheat
Degree, by the higher Secondary Air of 330 heating temperatures of the third vapour hot-air heater, then passes through first pair of pressure steam air heater respectively
430 come heating temperature higher First air and Secondary Air, while enter corresponding 530 heating temperature of third high-pressure heater
Relatively low feedwater.So as to fulfill the steam heat step extracted out from the high pressure cylinder 120 for heating air and feedwater, carry significantly
The high utilization ratio of extracted steam from turbine reduces the cold source energy of steam turbine.
The air crosses hot cell 300 and further includes the 4th vapour hot-air heater 340, and the air preheat unit 400 further includes
Second pair of pressure steam air heater 440, the feedwater heating unit 500 further include the 4th high-pressure heater 540；
The high pressure cylinder 120 is connect with the 4th vapour hot-air heater 340, the vapour side of the 4th vapour hot-air heater 340
The vapour side-entrance with the 4th high-pressure heater 540 and second pair of pressure steam air heater 440 is exported to connect, and the described 4th
High-pressure heater 540 is connect after being connected in parallel with second pair of pressure steam air heater 440 with the feedwater deaeration heating unit 600.
4th grade of steam extraction is heated respectively from the steam discharge of high pressure cylinder described in steam turbine 120 by the 4th vapour hot-air heater 340
The higher Secondary Air of temperature, then respectively by second pair of pressure steam air heater 440 come the higher First air of heating temperature and secondary
Wind and the feedwater that the feed pump 900a outlets are heated by the 4th high-pressure heater 540, the hydrophobic of formation converge it
Enter the 600 heat-setting water of feedwater deaeration heating unit afterwards.It is achieved in the steam heat extracted out from the high pressure cylinder 120
Cascade utilization substantially increases the utilization ratio of extracted steam from turbine, reduces the low-temperature receiver damage of steam turbine in heating air and feedwater
It loses.
Fig. 1 is please referred to, the Double reheat steam turbine backheat energy utility system of above-mentioned heating boiler primary and secondary air further includes
Small turbine 920 and intermediate pressure cylinder 130, the air cross hot cell 300 and further include the 5th vapour hot-air heater 350, and the air is pre-
Hot cell 400 further includes the double pressure steam air heaters 450 of third；
Medium pressure cylinder 130 is connect with the 5th vapour hot-air heater 350, the vapour side of the 5th vapour hot-air heater 350
Vapour side of the outlet with the double pressure steam air heaters 450 of the feedwater deaeration heating unit 600, the small turbine 920 and the third
Import connects, and the feedwater deaeration heating unit 600 is connected in parallel rear and the described 4th with the double pressure steam air heaters 450 of the third
High-pressure heater 540 connects.
Wherein, the 5th grade of first order steam extraction of the steam extraction from steam turbine medium pressure cylinder 130, and it has very high overheat
Degree first passes through time high Secondary Air of 350 heating temperature of the 5th vapour hot-air heater, shunts again later, wherein all the way branch into
Enter the 600 heat-setting water of feedwater deaeration heating unit, another double pressure steam air heaters 450 of the third that branch into heat once
Wind and Secondary Air, third branch then use into the small turbine 900 as driving steam, greatly improve steam energy
Utilization ratio.
Feed pump 900a and feed-regulating valve 900b are further included, the flue gas unit 200 exchanges heat including high temperature cigarette water
Device 220, and the boiler furnace 1000 is connect with the fume side of the high temperature cigarette water- to-water heat exchanger 220, the feedwater heating unit
500 be connected in parallel with the high temperature cigarette water- to-water heat exchanger 220 after connect with the feed pump 900a, the feed-regulating valve 900b goes here and there
It is coupled between the feed pump 900a and the feedwater heating unit 500.
The feed-regulating valve 900b and it is described feedwater heating unit 500 series connection after again with the high temperature cigarette water- to-water heat exchanger
220 water side is connected in parallel, and the confluent into the high temperature cigarette water- to-water heat exchanger 220 is controlled by the feed-regulating valve 900b,
So as to make the outlet feed temperature of the high temperature cigarette water- to-water heat exchanger 220 higher than feedwater heating unit 500 outlet to water temperature
Degree improves the feed temperature into economizer, so as to make the structure of the cascade utilization of the exiting flue gas of the boiler furnace 1000
Design is more reasonable, in addition, the feed pump 900a overcomes the resistance of the high temperature cigarette water- to-water heat exchanger 220 and its pipeline.
The air crosses hot cell 300 and further includes the 6th vapour hot-air heater 360, the 7th vapour hot-air heater 340 and the first gas
Warm regulating valve 370a, the air preheat unit 400 further include the 4th pair of pressure steam air heater 460, the condensation water heating unit 700
Including the first low-pressure heater 710 and the second low-pressure heater 720；
Medium pressure cylinder 130, the 6th vapour hot-air heater 360 and the 7th vapour hot-air heater 370 are sequentially connected, institute
The vapour side both ends that the first temperature regulating valve 370a is connected in parallel in the 7th vapour hot-air heater 370 are stated, the 7th vapour gas adds
The vapour side outlet of hot device 370 connects with the vapour side-entrance of first low-pressure heater 710 and the 4th pair of pressure steam air heater 460
It connects, and first low-pressure heater 710 is connected in parallel rear and second low-pressure heating with the 4th pair of pressure steam air heater 460
Device 720 connects.
Wherein, the 6th grade of steam extraction come from medium pressure cylinder 130 have higher degree of superheat second level steam extraction, first pass through
The higher Secondary Air of 6th vapour hot-air heater, 360 heating temperature enters back into 370 heating temperature of the 7th vapour hot-air heater highest one
Secondary wind heats First air and Secondary Air by the 4th pair of pressure steam air heater 460 respectively later and is added by first low pressure
Hot 710 heat-setting water of device, the hydrophobic of formation converge later into the 720 heat-setting water of the second low-pressure heater, realize
From the steam heat cascade utilization that medium pressure cylinder 130 is extracted out in heating air and condensation water, extracted steam from turbine is substantially increased
Utilization ratio, reduce the cold source energy of steam turbine.In addition, the first temperature regulating valve 370a is parallel to the 7th vapour
The vapour side both ends of hot-air heater 370 can turn down or open the big first vapour controlled atmosphere according to the needs of the air temperature in outlet
Valve 370a is saved, adjusts the quantity of steam for flowing through the 7th vapour hot-air heater 370.In addition, the requirement of coal pulverizer 1200 is primary
Wind-warm syndrome is generally below secondary air temperature, does not need to heat First air using whole steam extractions, in First air heating pipeline
End sets the 7th vapour hot-air heater 370 to adjust a wind-warm syndrome.
The air crosses hot cell 300 and further includes the 8th vapour hot-air heater 380 and the second temperature regulating valve 380a, the sky
Gas preheating unit 400 further includes the 5th pair of pressure steam air heater 470, and the condensation water heating unit 700 further includes third low-pressure heating
Device 730；
Medium pressure cylinder 130 is connect with the 8th vapour hot-air heater 730, and the second temperature regulating valve 380a parallel connections connect
It is connected to the vapour side both ends of the 8th vapour hot-air heater 730, the vapour side outlet of the 8th vapour hot-air heater 380 is with described
The vapour side-entrance of two low-pressure heaters 720 and the 5th pair of pressure steam air heater 470 connects, and second low-pressure heater 720
It is connect after being connected in parallel with the 5th pair of pressure steam air heater 470 with the third low-pressure heater 730.
Wherein, the 7th grade of steam extraction come from medium pressure cylinder 130 have higher degree of superheat third level steam extraction, first pass through
The high First air of 8th vapour hot-air heater, 380 heating temperature time, is added later by the 5th pair of pressure steam air heater 470 respectively
Heat primary air and Secondary Air and by the 720 heat-setting water of the second low-pressure heater, formation it is hydrophobic converge after enter
The 730 heat-setting water of third low-pressure heater is realized from the steam heat cascade utilization that medium pressure cylinder 130 is extracted out in adding
Hot-air and condensation water substantially increase the utilization ratio of extracted steam from turbine, reduce the cold source energy of steam turbine.In addition, institute
The vapour side both ends that the second temperature regulating valve 380a is parallel to the 8th vapour hot-air heater 380 are stated, it can be according to an air temperature
Needs turn down or open the big second vapour gas regulating valve 380a, adjust the steam for flowing through the 8th vapour hot-air heater 380
Amount.In addition, the wind-warm syndrome that the coal pulverizer 1200 requires is generally below secondary air temperature, do not need to add using whole steam extractions
Heat primary air is arranged in series institute between the setting of the end of the air preheat unit 400 and the 7th vapour hot-air heater 370
The 8th vapour hot-air heater 380 is stated to adjust a wind-warm syndrome.
In the system using air preheater heating air, First air hot blast temperature generally reaches 300 DEG C or more, usually
The needs of pulverized coal preparation system drying process are had exceeded, for this purpose, coal pulverizer is controlled to go out one's intention as revealed in what one says powder temperature by mixing cold First air, because
The cold blast rate large percentage of this pulverized coal preparation system incorporation.The present invention passes through the first vapour gas regulating valve 370a and the second vapour gas
Regulating valve 380a controls a wind-warm syndrome, eliminates cold wind in First air and mixes the phenomenon that hot wind temperature difference is big, irreversible loss is big.
In real work, the first temperature regulating valve 370a and the second temperature regulating valve 380a set the 7th vapour gas respectively
On 380 steam lateral line of heater 370 and the 8th vapour hot-air heater, need first to open according to the control wind-warm syndrome of coal pulverizer 1200
Open or after close the second temperature regulating valve 380a, be then turned on or first close the first temperature regulating valve 370a.
As shown in Figure 1, the Double reheat steam turbine backheat energy utility system of above-mentioned heating boiler primary and secondary air further includes
First condensate booster pump 900c, the second condensate booster pump 900d, medium temperature cigarette water- to-water heat exchanger 240 and low temperature cigarette water- to-water heat exchanger
The outlet of 260, the first condensate booster pump 900c connect the low temperature cigarette water- to-water heat exchanger 260, first low-pressure heating
Device 710 is connected in parallel after being connected in series with second low-pressure heater 720 with the low temperature cigarette water- to-water heat exchanger 260, described
The outlet of second condensate booster pump 900d connects the medium temperature cigarette water- to-water heat exchanger 240, the feedwater deaeration heating unit 600 with
The medium temperature cigarette water- to-water heat exchanger 240 is connected in parallel, and the feedwater heating unit 500 is in parallel with the high temperature cigarette water- to-water heat exchanger 220
Connection.
The entrance condensation water of the low temperature cigarette water- to-water heat exchanger 260 comes from the first condensate booster pump 900c, and described first
The entrance condensation water of condensate booster pump 900c is quoted from the entrance of second low-pressure heater 720, the low temperature cigarette water heat exchange
The outlet condensation water of device 260 leads back steam turbine workshop and converges with first low-pressure heater 710 outlet condensation water.
The entrance condensation water of the medium temperature cigarette water- to-water heat exchanger 240 comes from the second condensate booster pump 900d, and described second
Quoted from the entrance of the feedwater deaeration heating unit 600, the medium temperature cigarette water changes the entrance condensation water of condensate booster pump 900d
The outlet condensation water of hot device 240 is led back to the entrance of the feed pump 900a, the outlet with the feedwater deaeration heating unit 600
Feedwater converges.
The entrance feedwater of the high temperature cigarette water- to-water heat exchanger 220 comes the outlet of the self-supporting feed pump 900a, and the high temperature
The outlet feedwater of cigarette water- to-water heat exchanger 220 is led back to the economizer entrance of the boiler furnace 1000, and is converged with main feedwater, no longer
Lead back steam turbine workshop.
Low pressure (LP) cylinder 140 is further included, the air preheat unit 400 further includes double calm the anger water- to-water heat exchanger 480 and third condensations
Water booster 490, the condensation water heating unit 700 further include the 4th low-pressure heater 740, and the low pressure (LP) cylinder 140 is and institute
It states third low-pressure heater 730 and the 4th low-pressure heater 740 connects, the 4th low-pressure heater 730, the third
Low-pressure heater 740, the third condensate booster pump 490 and double water- to-water heat exchangers 480 of calming the anger recycle connection successively.
The two-stage steam extraction of the low pressure (LP) cylinder 140 is in negative pressure state, it is impossible to be used directly to heating air, be directly entered described
Third low-pressure heater 730 and the 4th low-pressure heater 740 are stated double water of calming the anger and are changed for heat-setting water in addition, described
The heat that hot device 480 obtains makes full use of the third low-pressure heater 730 and described for heating First air and Secondary Air
The heat that four low-pressure heaters, 740 heat-setting water obtains.In addition, to reduce cost, double water- to-water heat exchangers 480 of calming the anger design
Water is introduced for pipe side, shell-side introduces air, and shell-side is divided into the two chambers of parallel arranged, side heating First air, and opposite side adds
Hot Secondary Air makes the First air mild two of double outlets of water- to-water heat exchanger 480 of calming the anger by the size of calculating design heat exchange area
Secondary wind-warm syndrome is roughly equal.
The Double reheat steam turbine backheat energy utility system of above-mentioned heating boiler primary and secondary air further include condenser 960,
Condensate pump 970 and gland heater 980, the condenser 960, the condensate pump 970, the gland heater 980 and
The water side of 4th low-pressure heater 740 is sequentially connected in series.
The double reheat power generation sets designed at present with air preheater and externally arranged steam cooler, imitate by the boiler of design
Rate is very high, and exhaust gas temperature is very low.If reducing electric precipitator inlet flue gas temperature using low-level (stack-gas) economizer, the energy saving profit brought is extremely
It is limited.The present invention removes the indispensable air preheater of conventional boiler design, removes externally arranged steam cooler, is returned using steam turbine
Hot steam extraction stepped heating First air and Secondary Air, and improve secondary air temperature as far as possible, so as to improve unit adapt to coal type change and
The ability surely fired improves unit reliability.Its benefit is various.On the one hand, remove air preheater improve it is high, in,
The flue gas quality of low temperature cigarette water- to-water heat exchanger enables flue gas to substitute steam extraction heat-setting water and the feedwater of more high level；The opposing party
Face increases the backheat effect of steam turbine, reduces the cold source energy of steam turbine；Furthermore improving secondary air temperature reduces boiler combustion
Expect consumption.By rearranging Thermal generation unit therrmodynamic system, achieve the purpose that greatly improve unit economy.With use
It exports air preheater, externally arranged steam cooler that smoke temperature is 115 DEG C to compare with the conventional scheme of low-level (stack-gas) economizer, Secondary Air
Temperature can be heated to 410 DEG C or more, and coal consumption for power generation reduction can be more than 5.5g/kWh.
It should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the premise,
Various modifications and improvements can be made, as steam turbine generator is designed as multiaxis, increase or decrease number of cylinders or steam turbine returns
Double pressure steam air heaters are changed to two single pressure steam air heaters and heat First air and two respectively by hot steam extraction series, the position for changing extraction opening
Secondary wind, changes vapour hot-air heater at the quantity for increasing or decreasing the steam air heater for heating First air and Secondary Air or vapour hot-air heater
Deng improvement, these belong to protection scope of the present invention.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that those of ordinary skill in the art are come
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (9)
1. the Double reheat steam turbine backheat energy utility system of a kind of heating boiler primary and secondary air, which is characterized in that including vapour
Turbine generator group unit, flue gas unit, air cross hot cell, air preheat unit, feedwater heating unit, feedwater deaeration
Heating unit, condensation water heating unit, primary air fan, overfire air fan, boiler furnace and coal pulverizer；
The turbine LP rotors unit crosses hot cell, the air preheat unit, the feedwater heating list with the air
First, described feedwater deaeration heating unit and the condensation water heating unit are all connected with；
The condensation water heating unit, the feedwater deaeration heating unit and the feedwater heating unit and the flue gas list
The water side of member is connected in parallel, and the condensation water heating unit, the feedwater deaeration heating unit and the feedwater heating unit
Vapour side of the vapour side respectively with the air preheat unit be connected in parallel, the air preheat unit crosses hot cell with the air
Air side be connected in series with；
The primary air fan crosses hot cell with the air preheat unit, the air and the coal pulverizer is sequentially connected, described
Overfire air fan crosses hot cell with the air preheat unit, the air and the boiler furnace is sequentially connected；Further include feedwater
Pump and feed-regulating valve, the flue gas unit include high temperature cigarette water- to-water heat exchanger, and the boiler furnace and the high temperature cigarette
The fume side connection of water- to-water heat exchanger, the feedwater heating unit are connected in parallel the rear and feedwater with the high temperature cigarette water- to-water heat exchanger
Pump connection, the feed-regulating valve are series between the feed pump and the feedwater heating unit；The condensation water heating is single
Member includes the 4th low-pressure heater, further includes condenser, and the condenser is connected company with the water side of the 4th low-pressure heater
It connects.
2. the Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air according to claim 1,
It is characterized in that, the turbine LP rotors unit includes ultra-high pressure cylinder, and the air is crossed hot cell and heated including the first vapour gas
Device, the air preheat unit include first single pressure steam air heater, and the feedwater heating unit includes the first high pressure of water side series connection
Heater and the second high-pressure heater；
The ultra-high pressure cylinder is connect with the first vapour hot-air heater, the vapour side outlet of the first vapour hot-air heater with it is described
The vapour side-entrance of first high-pressure heater and described first single pressure steam air heater connect, and first high-pressure heater and described the
One single pressure steam air heater is connect after being connected in parallel with second high-pressure heater.
3. the Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air according to claim 2,
It is characterized in that, the turbine LP rotors unit further includes high pressure cylinder, and the air, which crosses hot cell and further includes the second vapour gas, to be added
Hot device, the air preheat unit further include second single pressure steam air heater, and the feedwater heating unit further includes third hyperbaric heating
Device；
The high pressure cylinder is connect with the second vapour hot-air heater, and the vapour side outlet of the second vapour hot-air heater is with described
The vapour side-entrance of two high-pressure heaters and described second single pressure steam air heater connects, and second high-pressure heater and described second
Single pressure steam air heater is connect after being connected in parallel with the third high-pressure heater.
4. the Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air according to claim 3,
It is characterized in that, the air crosses hot cell and further includes third vapour hot-air heater, and the air preheat unit further includes first pair of pressure
Steam air heater, the feedwater heating unit further include the 4th high-pressure heater；
The high pressure cylinder is connect with the third vapour hot-air heater, and the vapour side outlet of the third vapour hot-air heater is with described
The vapour side-entrance of three high-pressure heaters and first pair of pressure steam air heater connects, and the third high-pressure heater and described first
Double pressure steam air heaters are connect after being connected in parallel with the 4th high-pressure heater.
5. the Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air according to claim 1,
It is characterized in that, the air crosses hot cell and further includes the 4th vapour hot-air heater, and the air preheat unit further includes second pair of pressure
Steam air heater, the feedwater heating unit further include the 4th high-pressure heater；
The high pressure cylinder is connect with the 4th vapour hot-air heater, and the vapour side outlet of the 4th vapour hot-air heater is with described
The vapour side-entrance of four high-pressure heaters and second pair of pressure steam air heater connects, and the 4th high-pressure heater and described second
Double pressure steam air heaters are connect after being connected in parallel with the feedwater deaeration heating unit.
6. the Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air according to claim 5,
It is characterized in that, further include small turbine and intermediate pressure cylinder, the air crosses hot cell and further includes the 5th vapour hot-air heater, the air
Preheating unit further includes the double pressure steam air heaters of third；
Medium pressure cylinder is connect with the 5th vapour hot-air heater, and the vapour side outlet of the 5th vapour hot-air heater is given with described
The vapour side-entrance connection of the double pressure steam air heaters of water deoxygenation heating unit, the small turbine and the third, and the feedwater deaeration
Heating unit is connect after being connected in parallel with the double pressure steam air heaters of the third with the 4th high-pressure heater.
7. the Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air according to claim 6,
It being characterized in that, the air crosses hot cell and further includes the 6th vapour hot-air heater, the 7th vapour hot-air heater and the first temperature regulating valve,
The air preheat unit further includes the 4th pair of pressure steam air heater, and the condensation water heating unit includes the first low-pressure heater and the
Two low-pressure heaters；
Medium pressure cylinder, the 6th vapour hot-air heater and the 7th vapour hot-air heater are sequentially connected, the first temperature tune
Section valve is connected in parallel in the vapour side both ends of the 7th vapour hot-air heater, and the vapour side outlet of the 7th vapour hot-air heater is and institute
The vapour side-entrance for stating the first low-pressure heater and the 4th pair of pressure steam air heater connects, and first low-pressure heater with it is described
4th pair of pressure steam air heater is connect after being connected in parallel with second low-pressure heater.
8. the Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air according to claim 7,
It is characterized in that, the air crosses hot cell and further includes the 8th vapour hot-air heater and the second temperature regulating valve, the air preheat list
Member further includes the 5th pair of pressure steam air heater, and the condensation water heating unit further includes third low-pressure heater；
Medium pressure cylinder is connect with the 8th vapour hot-air heater, and the second temperature regulating valve is connected in parallel in the 8th vapour
The vapour side both ends of hot-air heater, the vapour side outlet of the 8th vapour hot-air heater with second low-pressure heater and described
After the vapour side-entrance of five pairs of pressure steam air heaters connects, and second low-pressure heater is connected in parallel with the 5th pair of pressure steam air heater
It is connect with the third low-pressure heater.
9. the Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air according to claim 8,
It is characterized in that, further includes the first condensate booster pump, the second condensate booster pump, medium temperature cigarette water- to-water heat exchanger and the heat exchange of low temperature cigarette water
Device, the outlet of first condensate booster pump connect the low temperature cigarette water- to-water heat exchanger, first low-pressure heater with it is described
Second low-pressure heater is connected in parallel after being connected in series with the low temperature cigarette water- to-water heat exchanger, second condensate booster pump
Outlet connects the medium temperature cigarette water- to-water heat exchanger, and the feedwater deaeration heating unit is connected in parallel with the medium temperature cigarette water- to-water heat exchanger,
The feedwater heating unit is connected in parallel with the high temperature cigarette water- to-water heat exchanger；
Low pressure (LP) cylinder is further included, the air preheat unit further includes double calm the anger water- to-water heat exchanger and third condensate booster pumps, described
Low pressure (LP) cylinder is connect with the third low-pressure heater and the 4th low-pressure heater, the 4th low-pressure heater, described
Third low-pressure heater, the third condensate booster pump and double water- to-water heat exchangers of calming the anger recycle connection successively.
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| WO2017170139A1 (en) * | 2016-03-31 | 2017-10-05 | 日本電気株式会社 | Heat exchange device, refrigeration system, and heat exchange method |
| CN107989667B (en) * | 2017-12-26 | 2023-07-14 | 华北电力大学 | Coal-fired secondary reheating steam turbine generator unit integrating supercritical CO ₂ circulation |
| CN112594019B (en) * | 2020-12-13 | 2022-11-25 | 东北电力大学 | Energy cascade efficient utilization system of supercritical coal-fired generator set |
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| US3835650A (en) * | 1973-05-03 | 1974-09-17 | Gen Electric | Steam air preheater for a steam boiler system |
| CN102705861A (en) * | 2012-06-15 | 2012-10-03 | 上海交通大学 | Air pre-heater system for fuel coal industrial boiler |
| CN103244944A (en) * | 2013-05-14 | 2013-08-14 | 华北电力大学 | Air preheating system and method performing steam extraction by utilizing steam turbine |
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