CN106403504A - Pre-drying lignite generating system and method of integrated two-stage fluidized bed dryer - Google Patents
Pre-drying lignite generating system and method of integrated two-stage fluidized bed dryer Download PDFInfo
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- CN106403504A CN106403504A CN201610429056.8A CN201610429056A CN106403504A CN 106403504 A CN106403504 A CN 106403504A CN 201610429056 A CN201610429056 A CN 201610429056A CN 106403504 A CN106403504 A CN 106403504A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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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
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/34—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines and returning condensate to boiler with main feed supply
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/005—Drying-steam generating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a pre-drying lignite generating system and a method of an integrated two-stage fluidized bed dryer. The system comprises a coal-fired generating system, a smoke fluidized bed dryer, a superheated steam fluidized bed dryer with an internal heater and an external feed water heater. A fluidizing air inlet of the smoke fluidized bed dryer is connected to the smoke exhaust side of a boiler, and a dry tail gas outlet is connected with a dust collector; a heat source inlet and an outlet of the internal heater of the superheated steam fluidized bed dryer are respectively connected to a steam extraction opening of a low-pressure cylinder of a steam turbine and the hydrophobic side of a corresponding regenerative heater; and the two dryers are connected in series, and lignite passes through the smoke fluidized bed dryer and the superheated steam fluidized bed dryer in sequence. According to the system and the method, the lignite can be dried by utilizing waste heat of exhaust smoke of the boiler and the steam extraction heat of the steam turbine simultaneously, so that the dry steam extraction quantity of the system is reduced, and additionally, a proper amount of dry tail gas which is easy to use is generated, so that the heat economy of the system is increased on the premise that a certain drying rate and the safety of the drying process are guaranteed.
Description
Technical field：
The invention belongs to coal-fired field of thermal power, pre- particularly to a kind of integrated two-step fluidized bed exsiccator
Drying brown coal electricity generation system and method.
Background technology：
Brown coal are a kind of huge colms of reserves, and its water content is high, volatile matter content is high, ash content is high,
Caloric value is low, easy spontaneous combustion, easily exploits, and price is typically relatively low.The total moisture of brown coal typically 30%～60%,
Volatile matters are generally higher than 40%.The transport to brown coal for its high-moisture, storage and burning all bring larger
Difficulty, greatly constrains the application in field of thermal power for the brown coal.Direct combusting brown coal carries out generating can be led to
Electricity generation system efficiency is far below the power station using fat coal, carries out pre-dried to brown coal before combustion, is
Improve the effective means of brown coal power plant generating efficiency.The utilization extracted steam from turbine having put into operation is drying source
The predrying power station of brown coal, achieves good economic benefit.But drying is a kind of process of highly energy-consuming, fully
Contribute to reducing lignite-fired plant further using the various waste heats in electricity generation system and drying system and generate electricity into
This.
Content of the invention：
It is an object of the invention to provide a kind of predrying brown coal electricity generation system of integrated two-step fluidized bed exsiccator
And method, it utilizes the heat drying brown coal of boiler exhaust gas waste heat and extracted steam from turbine simultaneously, is reducing drying
While the amount of drawing gas, can produce be easy in right amount using tail gas is dried, ensureing certain dry rate and dry
On the premise of dry process safety, improve system heat-economy.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that to realize：
A kind of predrying brown coal electricity generation system of integrated two-step fluidized bed exsiccator, including boiler, steam turbine,
Electromotor, condenser, condensate pump, heat regenerative system, external feed-water heater, small turbine, electromotor
And two-step fluidized bed drying system, the first to the 3rd high-pressure heater that heat regenerative system includes being sequentially connected,
Oxygen-eliminating device and first to fourth low-pressure heater, small turbine entrance connects steam turbine grade extraction opening, its
Outlet connects condenser, and two-step fluidized bed drying system includes coal breaker, flue gas fluidized bed dryer, dedusting
Device, the steam fluidized bed dryer with internal heater, cleaner unit, blower fan and coal pulverizer；Wherein,
Boiler superheater outlet connects steam turbine main steam inlet, Steam Turbine Driven electrical power generators, steam turbine
Steam drain connects condenser steam inlet, and condenser condensed water outlet connects heat regenerative system feedwater side import, according to
Secondary flow through four low-pressure heaters, oxygen-eliminating device and three high-pressure heaters, and the first high-pressure heater feeds water out
Mouth connects boiler feedwater inlet；
The built-in heating of the steam fluidized bed dryer of steam turbine grade regenerative steam mouth connect band internal heater
Device thermal source inlet；
Coal breaker discharge connects flue gas fluidized bed dryer coal powder entrance, flue gas fluidized bed dryer coal dust
The steam fluidized bed dryer coal powder entrance of outlet connect band internal heater, with the steam stream of internal heater
Change bed dryer discharge and connect coal pulverizer coal powder entrance, coal pulverizer discharge connects boiler coal-ash entrance；
Flue gas fluidized bed dryer offgas outlet connects cleaner unit entrance, and house outlet is divided into two strands, one connection
Air, one connects coal pulverizer coal powder entrance；Steam fluidized bed dryer offgas outlet with internal heater
Connect cleaner unit entrance, house outlet is divided into three strands, one connects coal pulverizer coal powder entrance, one connection
Fans entrance, one connects external feed-water heater thermal source inlet.
The present invention is further improved by：Boiler flue gas outlet is divided into two strands, and one connects air, one
Connect flue gas fluidized bed dryer fluidized wind entrance.
The present invention is further improved by：Steam fluidized bed dryer internal heater with internal heater
Thermal source outlet connects corresponding bleeder heater hydrophobic side.
The present invention is further improved by：External feed-water heater condenses water out and connects external environment.
The present invention is further improved by：Also include feed pump, connection removes respectively for feedwater pump inlet, outlet
The outlet of oxygen device, the 3rd high-pressure heater feed-water intake.
The present invention is further improved by：Also include cooling tower, the gateway of cooling tower is cold with condenser
But form closed circuit between water gateway.
A kind of predrying brown coal electricity-generating method of integrated two-step fluidized bed exsiccator, the method is based on above-mentioned one
Plant the predrying brown coal electricity generation system of integrated two-step fluidized bed exsiccator, comprise the steps：
The coal dust of coal pulverizer outlet enters boiler furnace burning, and working-medium water was heated to by the high-temperature flue gas of generation
Vapourss state, sends into expansion work in steam turbine by main steam line, and driving steam turbine rotates, steamer
Machine drives electrical power generators；Turbine low pressure cylinder outlet vapor enters condenser condensation, and condensate is through condensing
Water pump enters heat regenerative system, absorbs heat in regenerators at different levels, subsequently into heat absorption evaporation in boiler；
Raw coal enters in flue gas fluidized bed dryer after coal breaker grinds and is dried, and boiler exhaust gas enter
As fluidized wind in flue gas fluidized bed dryer, provide the heat needed for brown coal drying, brown coal are in flue gas simultaneously
Remove part moisture in fluidized bed dryer, tail gas is dried and enters air after cleaner unit dedusting, under separating
The pulverized coal particle coming enters coal pulverizer, enters band through the brown coal of flue gas fluidized bed dryer preliminarily dried built-in
Continue drying in the steam fluidized bed dryer of heater, the steam fluidized bed dryer with internal heater
Thermal source draws gas for certain level steam turbine, and drying is drawn gas built-in in the steam fluidized bed dryer with internal heater
Corresponding bleeder heater hydrophobic side is entered, brown coal are in the steam stream with internal heater after condensing in heater
Change entrance coal pulverizer after bed dryer is dried to grind, subsequently into boiler furnace burning, with internal heater
Steam fluidized bed dryer tail gas is dried after cleaner unit dedusting, a part by blower fan send into band built-in plus
Fluidized wind regarded by the steam fluidized bed dryer of hot device, is partly into external feed-water heater heating part low
Pressure feedwater, the pulverized coal particle that cleaner unit separates enters coal pulverizer and grinds.
With respect to prior art, the invention has the advantages that：
A kind of predrying brown coal electricity generation system of integrated two-step fluidized bed exsiccator of the present invention, in this system, cigarette
Gas fluidized bed dryer and the steam fluidized bed dryer arranged in series with internal heater, two exsiccators divide
Not by the use of boiler exhaust gas and extracted steam from turbine as drying source, this design decreases uses merely extracted steam from turbine
It is dried the adverse effect that electricity generation system efficiency is brought, it also avoid using merely boiler exhaust gas drying brown coal
The drying capacity being easily caused is not enough and the unsafe problem of dry run, meanwhile, can be according to brown coal As-received
Water content is different and degree of drying sets change and adjust the load of two exsiccators.With internal heater
Steam fluidized bed dryer offgas outlet connects cleaner unit, and cleaner unit gas outlet connects external feed-water heater
Thermal source inlet.If only carrying out single-stage drying using the steam fluidized bed dryer with internal heater, make
During with the brown coal of high-moisture, easily occur being dried tail gas superfluous it is impossible to the situation of utilization completely, cause waste heat
The waste of resource, drying system proposed by the present invention and method can be with this problems of effectively solving.Calculating coal
Under design conditions, pre- with the single-stage drying brown coal of the only steam fluidized bed dryer with internal heater for the setting
Electricity generation system is dried compare, generating efficiency improves 1.35%, draw gas amount is dried and reduces 11.3t/h.
A kind of predrying brown coal electricity-generating method of integrated two-step fluidized bed exsiccator of the present invention, the method is with tradition
Coal fired power generation method based on, be integrated with two-step fluidized bed exsiccator, the first order be flue gas fluid bed drying
Device, the second level is the steam fluidized bed dryer with internal heater, and two exsiccators are respectively with boiler exhaust gas
It is drying source with extracted steam from turbine.Brown coal sequentially pass through two exsiccators, and be dried to setting is dried journey
Degree.The tail gas that is dried of first order exsiccator is refused to utilize, and the tail gas of second level exsiccator is low for heating boiler
Pressure feedwater.The fluidized wind of first order exsiccator is boiler exhaust gas, and the fluidized wind of second level exsiccator is through removing
Dirt tail gas is dried.
The advantage that the method that two-stage is dried combines two kinds of exsiccators overcomes some shortcomings simultaneously, specifically,
The thermal source of flue gas fluidized bed dryer is boiler exhaust gas, can improve system using the waste heat of boiler exhaust gas and generate electricity
Efficiency, but the energy density of boiler exhaust gas is less, and drying capacity is low, and the waste heat of exsiccator tail gas is difficult to
Using it is drying source that the steam fluidized bed dryer with internal heater utilizes extracted steam from turbine, thermal source ratio
Heat is big, and drying capacity is strong, dry run safety, tail gas steam content height is dried it is easy to utilize, but takes out
Vapour drying reduces steam turbine and exerts oneself, and two-stage drying meanss proposed by the present invention combine two kinds of drying meanss
Advantage, has relatively in drying capacity, coal adaptability, degree of drying adaptability and system economy
Big raising.
Brief description：
Fig. 1 is the structure principle chart of the present invention.
In figure：1 is boiler, and 2 is steam turbine, and 3 is condenser, and 4 is cooling tower, and 5 is condensate pump, 6
For external feed-water heater, 7 is small turbine, and 8 is feed pump, and 9 is coal breaker, and 10 is flue gas fluid bed
Exsiccator, 11 is cleaner unit, and 12 is the steam fluidized bed dryer with internal heater, and 13 is cleaner unit,
14 is blower fan, and 15 is coal pulverizer, and 16 is electromotor, and 17 is the first high-pressure heater, and 18 is the second high pressure
Heater, 19 is the 3rd high-pressure heater, and 20 is oxygen-eliminating device, and 21 is the first low-pressure heater, and 22 is the
Two low-pressure heaters, 23 is the 3rd low-pressure heater, and 24 is the 4th low-pressure heater.
Specific embodiment：
Below in conjunction with accompanying drawing, the present invention is described in further detail
As shown in figure 1, a kind of predrying brown coal electricity generation system of integrated two-step fluidized bed exsiccator of the present invention,
Including boiler 1, steam turbine 2, electromotor 15, condenser 3, cooling tower 4, condensate pump 5, backheat system
System, external feed-water heater 6 and two-step fluidized bed drying system, heat regenerative system include being sequentially connected the
One to the 3rd high-pressure heater 17-19, oxygen-eliminating device 20 and first to fourth low-pressure heater 21-24, two-stage
Fluidized bed drying system includes coal breaker 9, flue gas fluidized bed dryer 10, cleaner unit 11, carries built-in heating
The steam fluidized bed dryer 12 of device, cleaner unit 13, blower fan 14, coal pulverizer 15.
Wherein, boiler 1 superheater outlet connects steam turbine 2 main steam inlet, and steam turbine 2 drives electromotor
16 generatings, steam turbine 2 steam drain connects condenser 3 steam inlet, and condenser 3 condenses water out and connects back to
Hot systems feedwater side-entrance, flows successively through four low-pressure heaters, oxygen-eliminating device 20 and three high-pressure heaters,
And the first high-pressure heater 17 feedwater outlet connects boiler feedwater inlet.
The steam fluidized bed dryer 12 of certain grade of regenerative steam mouth connect band internal heater of steam turbine 2 built-in
Heater thermal source inlet.
Coal breaker 9 discharge connects flue gas fluidized bed dryer 10 coal powder entrance, flue gas fluidized bed dryer
Steam fluidized bed dryer 12 coal powder entrance of 10 discharge connect band internal heater, carries internal heater
Steam fluidized bed dryer 12 discharge connect coal pulverizer 15 coal powder entrance, coal pulverizer 15 discharge
Connect boiler 1 coal powder entrance；Flue gas fluidized bed dryer 10 offgas outlet connects cleaner unit 11 entrance, removes
Dirt device 11 outlet is divided into two strands, and one connects air, and one connects coal pulverizer 15 coal powder entrance；Band is built-in
Steam fluidized bed dryer 12 offgas outlet of heater connects cleaner unit 13 entrance, cleaner unit 13 outlet point
For three strands, one connects coal pulverizer 15 coal powder entrance, one connecting fan 14 entrance, and one connection is external
Feed-water heater 6 thermal source inlet.
Further, boiler 1 exhanst gas outlet is divided into two strands, and one connects air, and one connects flue gas fluidisation
Bed dryer 10 fluidized wind entrance.
Further, the steam fluidized bed dryer 12 internal heater thermal source outlet with internal heater connects
Corresponding bleeder heater hydrophobic side.
Further, external feed-water heater 6 condenses water out connection external environment.
Further, feed pump (8) import, outlet respectively connect oxygen-eliminating device 20 exports, the 3rd high pressure adds
Hot device 19 feed-water intake.
Further, cooling tower 4, the cooling water gateway of the gateway of cooling tower 4 and condenser 3 are also included
Between form closed circuit.
The electricity generation system that the present invention announces, is integrated with drying system, residual neat recovering system simultaneously, is subtracting as far as possible
While few energy consumption for drying, improve the yield of waste heat.Under standard condition, for the boiler exhaust gas being dried
Flow is 250.92t/h, reduces the dry 11.3t/h that draws gas.
A kind of predrying brown coal electricity-generating method of integrated two-step fluidized bed exsiccator of the present invention, comprises the steps：
The coal dust of coal pulverizer 15 outlet enters boiler 1 hearth combustion, and working-medium water is heated by the high-temperature flue gas of generation
To superheated steam state, expansion work in steam turbine 2,2 turns of driving steam turbine are sent into by main steam line
Dynamic, steam turbine 2 drives electromotor 16 to generate electricity；Steam turbine 2 low pressure (LP) cylinder outlet vapor enters condenser 3 and condenses,
Condensate enters heat regenerative system through condensate pump 5, absorbs heat, subsequently into boiler 1 in regenerators at different levels
Middle heat absorption evaporation.
Raw coal enters in flue gas fluidized bed dryer 10 after coal breaker 9 grinds and is dried, boiler exhaust gas
Enter in flue gas fluidized bed dryer 10 as fluidized wind, the heat needed for brown coal drying, brown coal are provided simultaneously
Remove part moisture in flue gas fluidized bed dryer 10, tail gas is dried and enters after cleaner unit 11 dedusting
Air, the pulverized coal particle separating enters coal pulverizer 15, through flue gas fluidized bed dryer 10 preliminarily dried
Brown coal enter the steam fluidized bed dryer 12 with internal heater in continue drying, with internal heater
The thermal source of steam fluidized bed dryer 12 draws gas for certain level steam turbine, and drying is drawn gas in the steaming with internal heater
Corresponding bleeder heater hydrophobic side, brown coal are entered after condensing in the internal heater of vapour fluidized bed dryer 12
Enter coal pulverizer 15 after the steam fluidized bed dryer 12 with internal heater is dried to grind, subsequently into
Boiler furnace burn, the steam fluidized bed dryer 12 with internal heater tail gas is dried through cleaner unit 13
After dedusting, a part is sent into the steam fluidized bed dryer 12 with internal heater by blower fan 14 and is regarded fluidisation
Wind, is partly into external feed-water heater 6 heating part low pressure feed water, the coal that cleaner unit 13 separates
Powder particles enter coal pulverizer 15 and grind.
The electricity-generating method that the present invention announces, the degree of drying that according to brown coal As-received water content, can set,
The difference of external feed-water heater power etc., reasonable distribution first order exsiccator and second level drier heat source stream
Amount, that is, be used for dry boiler exhaust gas flow and steam turbine is dried the amount of drawing gas, and reduces energy consumption for drying and system is imitated
The adverse effect of rate.Under standard condition, system generating efficiency can be made to improve 1.3%.
In short, brown coal enter boiler furnace burning after two-stage exsiccator is dried, two-stage exsiccator
Arrangement overcomes the deficiency that single-stage is dried, and the safety of dry run, economy, drying capacity, coal are fitted
The system that the aspects such as Ying Xing, degree of drying subject range are dried than single-stage has greater advantage.
It should be understood that this embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.Additionally,
It should also be understood that after having read the content of present invention instruction, those skilled in the art can do to this
Go out various change or modification, however, these equivalent form of values equally fall within the application appended claims being limited
Fixed scope.
Claims (7)
1. a kind of predrying brown coal electricity generation system of integrated two-step fluidized bed exsiccator it is characterised in that：Including
Boiler (1), steam turbine (2), electromotor (15), condenser (3), condensate pump (5), heat regenerative system,
External feed-water heater (6), small turbine (7), electromotor (16) and two-step fluidized bed drying system,
Heat regenerative system includes the first to the 3rd high-pressure heater (17-19), the oxygen-eliminating device (20) and being sequentially connected
One to the 4th low-pressure heater (21-24), small turbine (7) entrance connects steam turbine (2) certain grade of extraction opening,
Its outlet connects condenser (3), and two-step fluidized bed drying system includes coal breaker (9), flue gas fluid bed is done
Dry device (10), cleaner unit (11), the steam fluidized bed dryer (12) with internal heater, cleaner unit (13),
Blower fan (14) and coal pulverizer (15)；Wherein,
Boiler (1) superheater outlet connects steam turbine (2) main steam inlet, and steam turbine (2) drives and generates electricity
Machine (16) generates electricity, and steam turbine (2) steam drain connects condenser (3) steam inlet, and condenser (3) coagulates
Bear water outlet and connect heat regenerative system feedwater side import, flow successively through four low-pressure heaters, oxygen-eliminating device (20)
With three high-pressure heaters, and the first high-pressure heater (17) feedwater outlet connect boiler feedwater inlet；
The steam fluidized bed dryer (12) of certain grade of regenerative steam mouth connect band internal heater of steam turbine (2)
Internal heater thermal source inlet；
Coal breaker (9) discharge connects flue gas fluidized bed dryer (10) coal powder entrance, flue gas fluid bed
Steam fluidized bed dryer (12) coal powder entrance of exsiccator (10) discharge connect band internal heater,
Steam fluidized bed dryer (12) discharge with internal heater connects coal pulverizer (15) coal powder entrance,
Coal pulverizer (15) discharge connects boiler (1) coal powder entrance；Flue gas fluidized bed dryer (10) tail gas
Outlet connects cleaner unit (11) entrance, and cleaner unit (11) outlet is divided into two strands, one connection air, and one
Stock connection coal pulverizer (15) coal powder entrance；Steam fluidized bed dryer (12) tail gas with internal heater
Outlet connects cleaner unit (13) entrance, and cleaner unit (13) outlet is divided into three strands, and one connects coal pulverizer (15)
Coal powder entrance, one connecting fan (14) entrance, one connects external feed-water heater (6) thermal source inlet.
2. a kind of predrying brown coal of integrated two-step fluidized bed exsiccator according to claim 1 generate electricity and are
System it is characterised in that：Boiler (1) exhanst gas outlet is divided into two strands, and one connects air, and one connects flue gas
Fluidized bed dryer (10) fluidized wind entrance.
3. a kind of predrying brown coal of integrated two-step fluidized bed exsiccator according to claim 1 generate electricity and are
System it is characterised in that：Steam fluidized bed dryer (12) internal heater thermal source with internal heater goes out
Mouth connects corresponding bleeder heater hydrophobic side.
4. a kind of predrying brown coal of integrated two-step fluidized bed exsiccator according to claim 1 generate electricity and are
System it is characterised in that：External feed-water heater (6) condenses water out and connects external environment.
5. a kind of predrying brown coal of integrated two-step fluidized bed exsiccator according to claim 1 generate electricity and are
System it is characterised in that：Also include feed pump (8), feed pump (8) import, outlet connect oxygen-eliminating device respectively
(20) outlet, the 3rd high-pressure heater (19) feed-water intake.
6. a kind of predrying brown coal of integrated two-step fluidized bed exsiccator according to claim 1 generate electricity and are
System it is characterised in that：Also include cooling tower (4), the gateway of cooling tower (4) and condenser (3)
Closed circuit is formed between cooling water gateway.
7. a kind of predrying brown coal electricity-generating method of integrated two-step fluidized bed exsiccator is it is characterised in that the party
Method is predrying brown based on a kind of integrated two-step fluidized bed exsiccator any one of claim 1 to 6
Coal power generation system, comprises the steps：
Coal dust that coal pulverizer (15) exports enters boiler (1) hearth combustion, and the high-temperature flue gas of generation are by working medium
Water is heated to superheated steam state, sends into expansion work in steam turbine (2) by main steam line, drives vapour
Turbine (2) rotates, and steam turbine (2) drives electromotor (16) to generate electricity；Steam turbine (2) low pressure (LP) cylinder exports
Steam enters condenser (3) condensation, and condensate enters heat regenerative system through condensate pump (5), at different levels
Absorb heat in regenerator, subsequently into heat absorption evaporation in boiler (1)；
Raw coal enters in flue gas fluidized bed dryer (10) after coal breaker (9) grinds and is dried, pot
Fire grate cigarette enters in flue gas fluidized bed dryer (10) as fluidized wind, provides needed for brown coal drying simultaneously
Heat, brown coal removing part moisture in flue gas fluidized bed dryer (10), tail gas is dried through cleaner unit
(11) enter air after dedusting, the pulverized coal particle separating enters coal pulverizer (15), through flue gas fluidisation
The brown coal of bed dryer (10) preliminarily dried enter the steam fluidized bed dryer (12) with internal heater
Middle continuation drying, the thermal source of the steam fluidized bed dryer (12) with internal heater is taken out for certain level steam turbine
Vapour, drying is drawn gas and is condensed in the internal heater of the steam fluidized bed dryer (12) with internal heater
After enter corresponding bleeder heater hydrophobic side, brown coal are in the steam fluidized bed dryer with internal heater
(12) enter coal pulverizer (15) after being dried to grind, subsequently into boiler furnace burning, carry internal heater
Steam fluidized bed dryer (12) tail gas is dried after cleaner unit (13) dedusting, a part by wind
Machine (14) is sent into the steam fluidized bed dryer (12) with internal heater and is regarded fluidized wind, and a part is entered
Enter external feed-water heater (6) heating part low pressure feed water, the pulverized coal particle that cleaner unit (13) separates
Enter coal pulverizer (15) to grind.
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| CN201610429056.8A CN106403504A (en) | 2016-06-16 | 2016-06-16 | Pre-drying lignite generating system and method of integrated two-stage fluidized bed dryer |
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| CN201610429056.8A CN106403504A (en) | 2016-06-16 | 2016-06-16 | Pre-drying lignite generating system and method of integrated two-stage fluidized bed dryer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108559542A (en) * | 2018-04-11 | 2018-09-21 | 西安交通大学 | Steam predrying and low temperature pyrogenation coupled system and operation method |
| CN111810940A (en) * | 2020-03-17 | 2020-10-23 | 同济大学 | Oxygen-enriched combustion boiler system for lignite multistage drying |
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| CN108559542B (en) * | 2018-04-11 | 2020-07-28 | 西安交通大学 | Steam pre-drying and low-temperature pyrolysis coupling system and operation method |
| CN111810940A (en) * | 2020-03-17 | 2020-10-23 | 同济大学 | Oxygen-enriched combustion boiler system for lignite multistage drying |
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