CN108626713A - A kind of power plant soot steam extraction drying UTILIZATION OF VESIDUAL HEAT IN integral system - Google Patents
A kind of power plant soot steam extraction drying UTILIZATION OF VESIDUAL HEAT IN integral system Download PDFInfo
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- CN108626713A CN108626713A CN201810308089.6A CN201810308089A CN108626713A CN 108626713 A CN108626713 A CN 108626713A CN 201810308089 A CN201810308089 A CN 201810308089A CN 108626713 A CN108626713 A CN 108626713A
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- 238000001035 drying Methods 0.000 title claims abstract description 46
- 238000000605 extraction Methods 0.000 title claims abstract description 25
- 239000004071 soot Substances 0.000 title claims abstract description 16
- 239000003077 lignite Substances 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 239000003245 coal Substances 0.000 claims abstract description 28
- 239000002918 waste heat Substances 0.000 claims abstract description 8
- 238000009833 condensation Methods 0.000 claims abstract description 5
- 230000005494 condensation Effects 0.000 claims abstract description 5
- 230000001172 regenerating effect Effects 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000007790 solid phase Substances 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010951 particle size reduction Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
-
- 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
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
-
- 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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/20—Drying
-
- 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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
-
- 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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
A kind of power plant soot steam extraction drying UTILIZATION OF VESIDUAL HEAT IN integral system, wherein, steam dryer steam inlet is connected with turbine bleed point, and steam dryer condensation water out is connected with oxygen-eliminating device, raw coal initially enters steam dryer, and steam dryer drying coal export is connected with boiler oil entrance；The drying steam exhaust of brown coal drying system accesses residual neat recovering system, and residual neat recovering system includes first order steam exhaust cooler, second level steam exhaust cooler, third level steam exhaust cooler；First order steam exhaust cooler, second level steam exhaust cooler, third level steam exhaust cooler are linked in sequence successively, using the step waste heat of dry steam exhaust by heating Steam Turbine Regenerative System condensed water, heating boiler wind pushing air, to external heat supply network heat supply；It realizes the cogeneration of heat and power of lignite power generation, while improving boiler efficiency, there is significant energy conservation and environmental protection benefit.
Description
Technical field
The invention belongs to coal-fired thermal power generation system fields, are related to a kind of pre-dried method and system of high water content brown coal.
Background technology
Lignite is a kind of low-disintegration coal, is a kind of colm, has the characteristics that high-moisture, low heat value.Currently, most of
In lignite power station, moisture is up to 30%~50% lignite without predrying, but is directly extracted with burner hearth in coal pulverizer
High-temperature flue gas contact it is dry to achieve the purpose that, dry used flue gas and the dry vapor generated are sent together with coal dust
Enter burner hearth, fire box temperature is caused to reduce, combustion stability is deteriorated, and exhaust gas volumn increases, and furnace cross-sectional area and volume accordingly increase, pot
The manufacture of stove and mounting cost increase.Meanwhile heat loss due to exhaust gas increases, boiler thermal efficiency reduces, so that the power generation of power plant
Efficiency reduces.Conventional lignite power station has the shortcomings that investment is larger, efficiency is low.
In lignite power station, generating efficiency can be improved by using pre-dried lignite.But high water content brown coal predrying
Journey needs to consume a large amount of thermal energy, and individual lignite predry drying system generally requires combustion parts lignite and provides energy for drying process
Amount, it is contemplated that this part lignite consumption, lignite power generation whole efficiency are still relatively low.It is in power generation by the lignite predrying system integration
System carries out predrying, and recycle the waste heat in dry tail gas simultaneously using the low grade heat energy in electricity generation system to lignite, can
To improve the whole efficiency of lignite power generation.
In existing scheme, lignite is dried in the superheated steam fluidisation bed dryer with internal heater, built-in
The heat source of heater comes from extracted steam from turbine, and condensed water returns in steam turbine steam/water circulating.Vapor caused by dry, one
Part is recycled as the fluidization steam vapor of fluidized bed dryer；A part enters condensing heat exchanger, heating boiler feed water；It is surplus
Remaining partially draining.Within the system, on the one hand, need a large amount of extracted steam from turbine, steam turbine acting is made to reduce；On the other hand, it does
Steam gasification latent heat can not recycle completely in dry tail gas, and redundance empties the waste for causing energy.
Invention content
To solve the above problems, improving lignite utilization ratio, the environment friendly in lignite power station is improved, the present invention proposes
UTILIZATION OF VESIDUAL HEAT IN integral system is dried in a kind of power plant soot steam extraction, is integrated with lignite steam extraction drying machine in the system, in lignite
Most of moisture removes in steam extraction drying machine, to improve lignite calorific value, while according to " temperature counterpart, cascade utilization "
Dry steam exhaust is orderly used to heating Steam Turbine Regenerative System condensed water by heat recovery principle, waste heat boiler is blown, externally
Heat supply, to significantly recycle the heat in dry steam exhaust.
To achieve the above object, the present invention takes following design scheme：
A kind of power plant soot steam extraction drying UTILIZATION OF VESIDUAL HEAT IN integral system, including conventional coal generating system, brown coal drying
System, residual neat recovering system；Conventional coal generating system is cooling and low by the boiler, steam turbine, turbine discharge being sequentially connected
Heating system, oxygen-eliminating device, feed heating system is pressed to constitute；It is characterized in that, brown coal drying system includes steam dryer,
In, steam dryer steam inlet is connected with turbine bleed point, and steam dryer condensation water out is connected with oxygen-eliminating device, raw coal
Steam dryer is initially entered, steam dryer drying coal export is connected with boiler oil entrance；The drying of brown coal drying system
Steam exhaust accesses residual neat recovering system, and residual neat recovering system includes first order steam exhaust cooler, second level steam exhaust cooler, the third level
Steam exhaust cooler；First order steam exhaust cooler, second level steam exhaust cooler, third level steam exhaust cooler are linked in sequence successively, profit
With the step waste heat stepped heating Steam Turbine Regenerative System condensed water of dry steam exhaust, heating boiler wind pushing air, to external heat supply network
Heat supply.
The drying and residual-heat utilization method, feature for also providing power plant soot steam extraction drying UTILIZATION OF VESIDUAL HEAT IN integral system exist
In,
1) raw material lignite is entered by transporting coal facility, enters drum-type rotary drier after raw material lignite grain is crushed；
2) drum-type rotary drier shell-side steam inlet is passed through the steam from power plant's host system, is revolved as drum-type
Turn the heat exchange heating agent of drying machine, raw material lignite and steam exchange heat drying in drum-type rotary drier, are steamed by indirect heat exchange
Send out the moisture of raw material lignite；Steam condensate (SC) access oxygen-eliminating device after heat exchange is back to power plant's host system；
3) water vapour being evaporated in drum-type rotary drier and the air come in raw material lignite in lignite entrance,
Mixed gas is formed, steam dryer dries steam exhaust after cyclone separator filters entrained fine breeze, accesses waste heat recovery system
System.
The cogeneration of heat and power of lignite power generation may be implemented in the present invention, while improving boiler efficiency, therefore with significant section
It can environmental benefit.
Description of the drawings
Fig. 1 is the structural schematic diagram of this system.
In figure：1 it is boiler, 2 be steam turbine, 3 be turbine discharge cooling and low-pressure heating system, 4 be oxygen-eliminating device, 5 is
Feed heating system, 61 be steam dryer, 62 be cyclone separator, 63 be first order steam exhaust cooler, 64 be that the second level is weary
Vapour cooler, 65 be circulating pump, 66 be air heater, 67 be third level steam exhaust cooler
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Below in conjunction with attached drawing, the present invention is described in detail, it should be understood that content described herein is merely to illustrate
It is of the invention with explaining, it is not intended to limit the present invention.
Lignite is a kind of colm, has the characteristics that high-moisture, high volatile, low heat value, the As-received water of China's lignite
It is 20%~50% to divide content, and volatile matter content is 40%~50%, and low heat valve is 10~21MJ/kg.Currently, lignite master
To be used for combustion power generation, but due in lignite moisture it is excessively high, lead to that conventional lignite efficiency of plant is low, investment is big, pollution
Seriously.
Lignite is dried, is to improve lignite generating efficiency to the calorific value for reducing the moisture in lignite, improving lignite
Effective means.Current drying process is mainly evaporation drying, i.e., makes the process of moisture removal in lignite by thermal methods.
In coal fired power plant, extracted steam from turbine is a kind of low-grade heat source, and most of heat in extracted steam from turbine can be with steam turbine
Steam discharge is discharged.Steam extraction drying machine is exactly a kind of drying process for realizing brown coal drying using extracted steam from turbine.
Since brown coal drying process consumes amount of heat, and these heats can largely be discharged with dry steam exhaust.It presses
According to the grade of dry exhaust steam heat energy, the thermal energy of dry steam exhaust can also be recycled for heating Steam Turbine Regenerative System condensed water, adding
Heat boiler is blown, can also external heat supply.Wherein, the energy grade of heating steam turbine condensed water is higher, the energy-saving effect of system
Can be bigger, providing external heat supply then can significantly recycle dry steam exhaust waste heat.
As shown in Figure 1, UTILIZATION OF VESIDUAL HEAT IN integral system is dried in a kind of power plant soot steam extraction.System integration steam drying
Machine, and the drying steam exhaust waste heat utilization system according to the design of " temperature counterpart, cascade utilization " principle.
Wherein, conventional coal generating system is cooling and low by the boiler (1), steam turbine (2), turbine discharge being sequentially connected
Heating system (3), oxygen-eliminating device (4), feed heating system (5) is pressed to constitute.Turbine discharge is cooling and low-pressure heating system (3) is wrapped
Include condenser, condensate pump, low-pressure heater；Feed heating system (5) includes feed pump, high-pressure heater；The steam of boiler
Outlet is connected to the steam inlet of steam turbine, and the steam exhaust of steam turbine outlet is connected to condenser, the condensed water of condenser outlet according to
The secondary feed-water intake that boiler is returned to after condensate pump, low-pressure heater, oxygen-eliminating device, feed pump, high-pressure heater, steamer
The extraction opening of different parameters on machine, is respectively connected to the heating steam inlet of low-pressure heater, oxygen-eliminating device and high-pressure heater,
Conventional thermal power generation steam-water circulation system is constituted above；
Lignite initially enters steam extraction drying system and is then sent into boiler.Steam extraction drying system includes steam dryer, wherein
Steam dryer (61) steam inlet is connected with steam turbine (2) extraction opening, and steam dryer (61) condenses water out and oxygen-eliminating device
(4) it is connected, raw coal initially enters steam dryer (61), the dry coal export of steam dryer (61) and boiler (1) fuel inlet
It is connected.Drum-type rotary drier can be used in steam dryer.
The brown coal drying system still further comprises coal bunker, electronic-weighing feeder, fine crusher, the outlet of the coal bunker
It is connect by screw(-type) feeder with the feed inlet of the electronic-weighing feeder, the discharge port of the electronic-weighing feeder and institute
The feed inlet connection of fine crusher is stated, the discharge port of the fine crusher is connect with the lignite entrance of the drum-type rotary drier,
The steam (vapor) outlet of steam turbine (2) extraction opening is connect with the steam inlet of the drum-type rotary drier.
Steam dryer dries steam exhaust outlet connection cyclone separator (62), is carried dry steam exhaust using cyclone separator
Fine breeze filter down, can transport to boiler (1) fuel inlet through cyclone separator solid-phase outlet.
The technical process of brown coal drying is as described below：
The raw material lignite that granularity is 20~30mm enters lignite coal bunker by transporting coal facility, and spiral is arranged in lignite coal bunker bottom
Batcher.Raw material lignite by electronic-weighing feeder is delivered to fine crusher by screw(-type) feeder to be done and is further crushed, by raw material
Lignite particle size reduction to less than 6.3mm are horizontal, subsequently into drum-type rotary drier.
Steam from power plant's host system is passed through by drum-type rotary drier shell-side steam inlet, is revolved as drum-type
Turn the heat exchange heating agent of drying machine, steam pressure≤0.5MPa, about 160~180 DEG C of temperature, raw material lignite is with steam in drum-type rotation
Turn the drying that exchanges heat in drying machine, the moisture of raw material lignite is evaporated by indirect heat exchange, total moisture is made to be down to 12% water by 39.5%
It is flat, it is delivered to boiler.Steam after heat exchange is condensed into 110~120 DEG C of saturated water, and access oxygen-eliminating device is back to host system of power plant
System,.
The water vapour being evaporated in drum-type rotary drier and the air come in raw material lignite in lignite entrance, shape
At about 100~110 DEG C of mixed gas, the fine breeze after carrying is partially dried is under the swabbing action of air-introduced machine, into whirlwind
Pulverized-coal filtering is got off in separator, is further delivered to boiler.
For the dry steam exhaust of steam dryer (61) after cyclone separator (62) filters entrained fine breeze, cyclone separator is weary
Vapor outlet accesses residual neat recovering system.Residual neat recovering system includes first order steam exhaust cooler (63), second level steam exhaust cooler
(64), third level steam exhaust cooler (67).First order steam exhaust cooler (63), second level steam exhaust cooler (64), the third level are weary
Vapour cooler (67) is linked in sequence successively.
First order steam exhaust cooler (63) is vapor-water heat exchanger, and the dry steam exhaust of vapour side access, generator is accessed in the sides Qi Shui
Group condensate system, first order steam exhaust cooler have condensing water inlet and cooling water outlet, first order steam exhaust cooler (63)
Cooling water outlet is connected with turbine discharge cooling and low-pressure heating system (3) mesolow heater.It is cooled down in first order steam exhaust
Dry steam exhaust exchanges heat with generating set condensed water in device, enters low-pressure heater after condensed water heating.
Second level steam exhaust cooler (64) is vapor-water heat exchanger, the dry steam exhaust of vapour side access, the sides Qi Shui successively with cycle
Pump (65), air heater (66) are connected by water lines and constitute heat transferring medium water-flow circuit；Air heater (66) is empty
Gas entrance is connected with environment, and air outlet slit is connected with boiler (2) air intake.In second level steam exhaust cooler dry steam exhaust with
Heat transferring medium water exchanges heat, and enters air heater after the heating of heat transferring medium water, enters for heating in air heater
The surrounding air of boiler.
Third level steam exhaust cooler (67) is vapor-water heat exchanger, the dry steam exhaust of vapour side access, the sides Qi Shui and external heat supply network
Water phase connects.Dry steam exhaust exchanges heat with hot net water in third level steam exhaust cooler, enters external heating after hot net water heating
Heat supply network.
Residual neat recovering system technical process is as described below：
The mixed gas of water vapour and air after filtering sequentially enters three steam exhaust coolers；It is returned by heating steam turbine
Hot systems condensed water, heating boiler air-supply, can also be to external heat supply network heat supply.
In three steam exhaust coolers, cooling medium (generating set condensed water, circulating picture-changing hot water and heat supply network recirculated water) with
The Mixed Gas Condensation of water vapour and air exchanges heat, and a large amount of vapor is cooled, and the incondensable gases such as air carry few
The steam of amount is discharged into air；Generating set condensed water after heat exchange enters low-pressure heater, and circulating picture-changing hot water enters air heating
Device heating input boiler air, heat supply network recirculated water enter heat supply network for thermal output, and exhaust heat stepped recycling simultaneously recycles.
Three steam exhaust coolers are both provided with hydrophobic pipeline, and the condensed water pump of the condensed condensate liquid of vapor returns in steam exhaust
It receives to unit draining system, realizes and the water of lignite water content is recycled.
Three steam exhaust coolers, which are both provided with, switches bypass, is realized in Various Seasonal operating mode or equipment event using switching bypass
Each steam exhaust cooler is put into operation or cut off when barrier repair.
Lignite moisture is dried to 5%~20% in steam dryer.Air quilt in air heater (66)
It is heated to 45~65 DEG C.
Advantages of the present invention：
1. the present invention carries out predrying using low-grade extracted steam from turbine heat to lignite, the flue gas of boiler is reduced
Amount, and then boiler volume is reduced, reduce boiler investment；
2. the present invention is using being a kind of co-generation unit, exhaust heat stepped recycling, condensate recycling, heating effect is good, has
Significant energy-saving benefit can be such that power station gross coal consumption rate reduces up to 10~30g/kWh.
Finally it should be noted that：The foregoing is merely the explanations of the present invention, are not intended to restrict the invention, although to this hair
It is bright to be described in detail, it for those skilled in the art, still can be to aforementioned recorded technical solution
It modifies or equivalent replacement of some of the technical features.All within the spirits and principles of the present invention, made by
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. UTILIZATION OF VESIDUAL HEAT IN integral system, including conventional coal generating system, brown coal drying system are dried in a kind of power plant soot steam extraction
System, residual neat recovering system；Conventional coal generating system is by boiler, steam turbine, the turbine discharge cooling being sequentially connected and low pressure
Heating system, oxygen-eliminating device, feed heating system are constituted；It is characterized in that, brown coal drying system includes steam dryer, wherein
Steam dryer steam inlet is connected with turbine bleed point, and steam dryer condensation water out is connected with oxygen-eliminating device, and raw coal is first
It is introduced into steam dryer, steam dryer drying coal export is connected with boiler oil entrance；The drying of brown coal drying system is weary
Vapour accesses residual neat recovering system, and residual neat recovering system includes that first order steam exhaust cooler, second level steam exhaust cooler, the third level are weary
Vapour cooler；First order steam exhaust cooler, second level steam exhaust cooler, third level steam exhaust cooler are linked in sequence successively, utilize
The step waste heat stepped heating Steam Turbine Regenerative System condensed water of dry steam exhaust, supplies external heat supply network heating boiler wind pushing air
Heat.
2. UTILIZATION OF VESIDUAL HEAT IN integral system is dried in power plant soot steam extraction according to claim 1, it is characterised in that：Steam turbine is arranged
Vapour is cooling and low-pressure heating system includes condenser, condensate pump, low-pressure heater；Feed heating system includes feed pump, height
Press heater；The steam (vapor) outlet of boiler is connected to the steam inlet of steam turbine, and the steam exhaust of steam turbine outlet is connected to condenser, coagulates
The condensed water of vapour device outlet returns to after passing through condensate pump, low-pressure heater, oxygen-eliminating device, feed pump, high-pressure heater successively
The feed-water intake of boiler, the extraction opening of different parameters, is respectively connected to low-pressure heater, oxygen-eliminating device and high pressure and adds on steam turbine
The heating steam inlet of hot device.
3. UTILIZATION OF VESIDUAL HEAT IN integral system is dried in power plant soot steam extraction according to claim 1, it is characterised in that：Steam drying
Machine uses drum-type rotary drier, the steam inlet of the steam (vapor) outlet of turbine bleed point and the drum-type rotary drier
Connection.
4. UTILIZATION OF VESIDUAL HEAT IN integral system is dried in power plant soot steam extraction according to claim 3, it is characterised in that：The lignite
Drying system still further comprises coal bunker, electronic-weighing feeder, fine crusher, and the outlet of the coal bunker is given with the electronic-weighing
The feed inlet of coal machine is connected by screw(-type) feeder, the feed inlet of the discharge port and the fine crusher of the electronic-weighing feeder
Connection, the discharge port of the fine crusher are connect with the lignite entrance of the drum-type rotary drier.
5. UTILIZATION OF VESIDUAL HEAT IN integral system is dried in power plant soot steam extraction according to claim 1, it is characterised in that：Steam drying
Machine dries steam exhaust outlet connection cyclone separator, filters down the fine breeze that dry steam exhaust carries using cyclone separator, passes through
Cyclone separator solid-phase outlet is delivered to boiler oil entrance；Steam dryer is dried entrained by steam exhaust filters through cyclone separator
After fine breeze, cyclone separator steam exhaust outlet access residual neat recovering system.
6. UTILIZATION OF VESIDUAL HEAT IN integral system is dried in power plant soot steam extraction according to claim 1, it is characterised in that：The first order is weary
Vapour cooler is vapor-water heat exchanger, and dry steam exhaust is accessed in vapour side, and generating set condensate system is accessed in the sides Qi Shui, and the first order is weary
There is vapour cooler condensing water inlet and cooling water outlet, first order steam exhaust cooler cooling water outlet to be cooled down with turbine discharge
And low-pressure heating system mesolow heater is connected.
7. UTILIZATION OF VESIDUAL HEAT IN integral system is dried in power plant soot steam extraction according to claim 1, it is characterised in that：The second level is weary
Vapour cooler is vapor-water heat exchanger, and the dry steam exhaust of vapour side access, the sides Qi Shui pass through water pipe with circulating pump, air heater successively
Road is connected and constitutes heat transferring medium water-flow circuit；Air heater air intake is connected with environment, and air outlet slit is empty with boiler
Gas entrance is connected.
8. UTILIZATION OF VESIDUAL HEAT IN integral system is dried in power plant soot steam extraction according to claim 1, it is characterised in that：The third level is weary
Vapour cooler is vapor-water heat exchanger, and the dry steam exhaust of vapour side access, the sides Qi Shui are connected with hot net water.
9. a kind of drying and UTILIZATION OF VESIDUAL HEAT IN side for drying UTILIZATION OF VESIDUAL HEAT IN integral system based on claim 1 power plant soot steam extraction
Method, which is characterized in that
1) raw material lignite is entered by transporting coal facility, enters drum-type rotary drier after raw material lignite grain is crushed；
2) drum-type rotary drier shell-side steam inlet is passed through the steam from power plant's host system, dry as drum-type rotation
The heat exchange heating agent of dry machine, raw material lignite and steam exchange heat drying in drum-type rotary drier, and it is former to pass through indirect heat exchange evaporation
Expect the moisture of lignite；Steam condensate (SC) access oxygen-eliminating device after heat exchange is back to power plant's host system；
3) water vapour being evaporated in drum-type rotary drier and the air come in raw material lignite in lignite entrance, form
Mixed gas, steam dryer dry steam exhaust after cyclone separator filters entrained fine breeze, access residual neat recovering system.
10. dry and residual-heat utilization method according to claim 9, which is characterized in that
The mixed gas of water vapour and air after filtering sequentially enters three steam exhaust coolers；By heating steam turbine backheat system
System condensed water, heating boiler air-supply, can also be to external heat supply network heat supply；
In three steam exhaust coolers, generating set condensed water, circulating picture-changing hot water and heat supply network recirculated water are as cooling medium and water
The Mixed Gas Condensation of steam and air exchanges heat, and most of vapor is cooled, and air incondensable gas carries a small amount of
Steam is discharged into air；Generating set condensed water after heat exchange enters low-pressure heater, and circulating picture-changing hot water enters air heater and adds
Thermal environment air, heat supply network recirculated water enter heat supply network for thermal output, exhaust heat stepped recycling；
The condensed water pump of the condensed condensate liquid of vapor is recycled to unit draining system in steam exhaust, recycling profit aqueous to lignite
With.
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