CN208779872U - A kind of system using coal-burning power plant's Secondary Air dried biomass - Google Patents
A kind of system using coal-burning power plant's Secondary Air dried biomass Download PDFInfo
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- CN208779872U CN208779872U CN201821210144.XU CN201821210144U CN208779872U CN 208779872 U CN208779872 U CN 208779872U CN 201821210144 U CN201821210144 U CN 201821210144U CN 208779872 U CN208779872 U CN 208779872U
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Abstract
The utility model discloses a kind of systems using coal-burning power plant's Secondary Air dried biomass.Currently, when coal-fired biomass coupled electricity-generation there are problems that flue gas drying biomass fuel can not be used.The utility model includes boiler, air preheater, secondary air fan, cold secondary air duct, the bypass of cold Secondary Air, the bypass of hot secondary air duct, hot Secondary Air, combination drying air duct and biomass drying device；Cold Secondary Air enters air preheater by secondary air fan and flue gas heat exchange is heated to form hot Secondary Air；The hot Secondary Air of extraction section is bypassed from hot Secondary Air, bypasses the cold Secondary Air of extraction section from cold Secondary Air；The combination drying hot wind of hot Secondary Air and the mixed Secondary Air of cold Secondary Air as biomass drying；Combination drying hot wind is sent into biomass drying device by combination drying air duct.The features such as the utility model has drying effect good, small to existing pipeline modification workload, is remarkably improved the calorific value and energy density of biomass, improves gasification of biomass efficiency.
Description
Technical field
The utility model belongs to biomass technical field of drying, is related in coal-fired gasification of biomass coupled electricity-generation system to life
The drying process of biomass fuel, specifically a kind of system using coal-burning power plant's Secondary Air dried biomass.
Background technique
Since the influence of PM2.5 and greenhouse effects in recent years is of increasing concern, biomass energy is increasingly by the world
The attention of various countries.Biomass energy is the form of energy that solar energy forms that chemical energy is stored in biomass with photochemical effect,
It directly or indirectly derives from the photosynthesis of green plants, is a kind of important renewable energy, has carbon dioxide row
Put neutral advantage.Currently, biomass power generation mainly has direct combustion power generation and coal-fired biomass coupled electricity-generation both direction.Directly
Connect the mainstream technology that combustion power generation is current domestic biomass power generation, it is possible to reduce the discharge of sulfide, nitride and dust, and
In CO2" zero-emission " is realized on total emission volumn.But there is also following disadvantages simultaneously for biomass direct combustion power generation: burning is endless
Entirely, unburned carbon in flue dust is higher, and fuel is made a low multiple use, and generating efficiency is only 25~28%；Biomass ash fusion point is low, easily adheres to
Occur coking and slagging on heating surface and influence to conduct heat, while will lead to denitrating catalyst poisoning, failure；The alkali generated after burning
Metal, chloride ion easily cause to corrode to metal material；Biomass supply exists seasonal.
Coal-fired biomass coupled electricity-generation couples biomass with the Large-sized Coal-fired Power group of 300MW or 600MW grade
Power generation has power supply efficiency high, reduces and invest using the existing steam turbine in coal-burning power plant, generator and pollutant control system
Cost, occupied area is small, and independent of advantages such as biomass supplies, which has in Europe at present answers extensively for unit operation
With.The national policy of support with to(for) coal-fired biomass coupled electricity-generation, which, which also starts to promote on a large scale at home, answers
With.
Biomass Gasification & Power Generation is one of the main technological route of coal-fired biomass coupled electricity-generation, is particularly suitable for biomass
Fuel source and the complex situation of type.Biomass Gasification & Power Generation refers to that biomass fuel (is generally heated in high temperature
600 DEG C or more) and completely or partially under anoxia condition, (usually have air, oxygen, vapor by means of certain gasifying medium
Or hydrogen), make volatile matter and fixed carbon in biomass that a series of thermal chemical reactions occur, generates with carbon monoxide, hydrogen, first
Alkane is the conversion process of the fuel gas of principal combustible components.The fuel gas of generation by purification after enter boiler, internal combustion engine,
Burning is in the combustion chamber of gas turbine power generation to generate electricity.
Biomass Gasification & Power Generation has higher requirement to the moisture content of biomass fuel, and moisture content is higher in raw material, can lead
The gasification efficiency of furnace is caused to reduce, biomass consumption is bigger.Therefore, Biomass Gasification & Power Generation usually requires to carry out biomass fuel
It is dried.
Traditional biomass direct combustion power generation usually carries out the drying of biomass fuel using the waste heat of boiler smoke.Patent
CN103254918A discloses a kind of system and method using boiler smoke drying with biomass fuel is carbonized, and is removed using boiler
Biomass fuel is dried in fume afterheat after dirt device, avoids influence of the biomass fuel moisture content to boiler system.Specially
Sharp CN102954678A discloses a kind of method using biomass boiler flue gas drying biomass fuel, mainly by after dedusting
Biomass boiler flue gas and biomass fuel contact heat-exchanging, so that biomass fuel be dried.Patent
CNI01693248A discloses a kind of method that biomass fuel is dried using high-temperature flue gas, makes water-contained biomass fuel
After high temperature flue gas drying, fluidisation slurry is made using heating pressurized treatments.The above patent is all to utilize biomass boiler
The exhaust gas temperature of the waste heat of flue gas, usual biomass direct combustion power generation boiler is up to 180 DEG C or more, therefore has enough heats to life
Biomass fuel is dried.And it is boiler and the pollutant control of Large-sized Coal-fired Power group that coal-fired biomass coupled electricity-generation technology, which utilizes,
System processed, exhaust gas temperature are more much lower than biomass direct-fired power plant, and especially Large-sized Coal-fired Power group has carried out ultralow row in recent years
Transformation is put, the fume afterheat of boiler discharge needs to improve the exhaust gas temperature in chimney, therefore the flue gas temperature after dedusting by MGGH
Usually only about 90 DEG C of degree.The flue gas heat of the part is inadequate, and moisture content is very high, can not carry out to biomass fuel effective
It is dry.
Utility model content
The purpose of this utility model is to solve that flue gas drying biomass can not be used when coal-fired biomass coupled electricity-generation at present
The problem of fuel, provides a kind of system using coal-burning power plant's Secondary Air dried biomass, is used for coal-fired biomass coupling hair
The biomass fuel of electricity is dry, the calorific value and energy density of biomass is remarkably improved, to improve gasification of biomass efficiency.
For this purpose, the utility model adopts the following technical solutions: a kind of using coal-burning power plant's Secondary Air dried biomass
System comprising boiler, air preheater, secondary air fan, cold secondary air duct, the bypass of cold Secondary Air, hot secondary air duct, heat are secondary
Wind bypass, combination drying air duct and biomass drying device, the top of biomass drying device is equipped with to be exported containing wet dry wind；
Flue gas in boiler enters air preheater, and cold Secondary Air enters air preheater by secondary air fan and changes with flue gas
Heat is heated to form hot Secondary Air；Hot Secondary Air is set at the hot secondary air duct of air preheater outlet and bypasses extraction section heat two
Secondary wind, while cold Secondary Air is set at the cold secondary air duct into before air preheater and bypasses the cold Secondary Air of extraction section；Heat two
The combination drying hot wind of secondary wind and the mixed Secondary Air of cold Secondary Air as biomass drying；Combination drying hot wind passes through mixing
Biomass drying device is sent into dry air duct, and biomass fuel is dried.
The utility model is with structure is simple, adaptability to raw material is wide, drying effect is good, to existing pipeline modification workload
It is small, the features such as being remarkably improved the calorific value and energy density of biomass, improve gasification of biomass efficiency.
Supplement as above-mentioned technical proposal, the biomass drying device are equipped with biomass feed inlet and biomass
Discharge port.
Supplement as above-mentioned technical proposal is equipped with flow measuring point and temperature point on combination drying air duct, required dry
The flow of scorching wind, temperature are determined according to type, moisture content and the quality of biomass.
Supplement as above-mentioned technical proposal, the hot Secondary Air bypass and the bypass of cold Secondary Air are respectively provided with flow adjusting
Baffle, flow controllable register adjust the flow of hot and cold Secondary Air, to control the flow and temperature of dry-heat air after mixing.
Supplement as above-mentioned technical proposal, the hot Secondary Air bypass and the bypass of cold Secondary Air are respectively provided with shutoff door,
Separated when not needing dry-heat air by shutoff door and is bypassed.
Supplement as above-mentioned technical proposal, the biomass drying device are the dry dress of concurrent flow belt biomass
It sets, biomass fuel Belt Conveying, hot wind is blown over above biomass fuel is dried biomass fuel, passes through tune
It saves dry-heat air flow, temperature and Belt Conveying speed and changes drying condition.
Supplement as above-mentioned technical proposal, the biomass drying device is according to the initial aqueous rate of biomass fuel
With the requirement to dry moisture content, upper and lower distributed multilevel conveyor belt, biomass fuel successively passes through multilayer conveyor belt, can
There is preferable drying effect.
The utility model is suitable for Large-sized Coal-fired Power group and biomass coupled electricity-generation.
Compared with the prior art, the utility model, which has the advantage that, is embodied in:
1. it is drying source that Secondary Air, which can be used, in the utility model, solving can not be used in coal-fired biomass coupling unit
The problem of flue gas is as heat source dried biomass fuel.
It, can be according to the moisture content tune of different biomass fuels 2. the dry-heat air temperature adjustable extent of the utility model is big
The temperature of dry wind is saved, adaptability to raw material is wide, drying effect is good, can effectively improve gasification of biomass efficiency.
3. the accounting of biomass power generation part is generally less than 10% in coal-fired biomass coupling power station, the utility model is done
Self-heating Secondary Air is extracted in scorching source, and general large-sized boiler secondary air fan surplus is larger, can meet the dry required air quantity of biomass.
Detailed description of the invention
Fig. 1 is the system construction drawing that the utility model utilizes coal-burning power plant's Secondary Air dried biomass.
Specific embodiment
The utility model is described in detail with reference to the accompanying drawings and detailed description, but the utility model is not limited solely to
Following embodiment.
System using coal-burning power plant's Secondary Air dried biomass as shown in Figure 1 comprising: boiler 1, air preheater
2, air preheater gas inlet 3, air preheater exhanst gas outlet 4, secondary air fan 5, cold secondary air duct 6, the bypass of cold Secondary Air
7, hot Secondary Air bypass 8, hot secondary air duct 14, combination drying air duct 9, biomass drying device 10, containing wet dry wind outlet 11,
Biomass feed inlet 12 and biomass discharge port 13.Biomass feed inlet 12 and biomass discharge port 13 are located at the dry dress of biomass
It sets on 10.The biomass drying device 10 is concurrent flow belt biomass drying device.In the heat of air preheater outlet
Hot Secondary Air bypass is set at secondary air duct, cold Secondary Air bypass is set at the cold secondary air duct into before air preheater.
Flow measuring point and temperature point are housed on combination drying air duct 9, the flow of required dry-heat air, temperature foundation are raw
Type, moisture content and the quality of substance determines.The bypass of hot Secondary Air and the bypass of cold Secondary Air is respectively provided with flow adjusting
Baffle, flow controllable register adjust the flow of hot and cold Secondary Air, to control the flow and temperature of dry-heat air after mixing.Institute
State hot Secondary Air bypass and cold Secondary Air bypass is respectively provided with shutoff door, when not needing dry-heat air by shutoff door every
Disconnected bypass.The biomass drying device is concurrent flow belt biomass drying device, biomass fuel Belt Conveying, heat
Wind is blown over above biomass fuel is dried biomass fuel, by adjusting dry-heat air flow, temperature and belt
Conveying speed changes drying condition.The biomass drying device contains according to the initial aqueous rate of biomass fuel and to drying
The requirement of water rate, upper and lower distributed multilevel conveyor belt, biomass fuel successively pass through multilayer conveyor belt, can have preferable dry
Dry effect.
The method for carrying out coal-burning power plant's Secondary Air dried biomass using above system, content are as follows:
By taking the scale of 600MW coal unit coupling 30MW biomass gasifying furnace as an example, biomass fuel moisture content is assumed to
45%, the biomass target moisture content after drying is 35%, and required biomass consumption is about 36-40t/h.Coal and biomass fuel
Material burning in boiler 1 generates high-temperature flue gas, enters air preheater 2 from air preheater gas inlet 3 and send with secondary air fan 5
The Secondary Air heat exchange entered, is heated into Secondary Air 280-330 DEG C of hot Secondary Air.Hot Secondary Air is connected at hot secondary air duct 14
Bypass 8, while cold Secondary Air bypass 7 is connected at the cold secondary air duct 6 into before air preheater.Extraction section is bypassed from hot Secondary Air
Hot Secondary Air bypasses the cold Secondary Air of extraction section from cold Secondary Air；Cold Secondary Air and the mixed Secondary Air temperature of hot Secondary Air
It is 150-180 DEG C, the hot wind dry as biomass is sent into biomass drying device 10 and biomass is dried, and biomass is dry
It is equipped at the top of dry device 10 containing wet dry wind outlet 11, the discharge temperature containing wet dry wind is 50-60 DEG C, can be straight containing wet dry wind
Run in and sky or send to the flue (air preheater exhanst gas outlet 4) before power plant's dust-extraction unit.Hot Secondary Air bypass 8 and cold Secondary Air
Shutoff door and flow controllable register are set in bypass 7, for adjusting the flow of hot and cold Secondary Air, dry-heat air after control mixing
Flow and temperature.Biomass after drying is sent out from biomass discharge port 13, can be sent directly into biomass gasifying furnace and be carried out gas
Change.
Using the biomass moisture content 35% after drying as target, dry-heat air about 90-100t/h is needed altogether, wherein hot secondary
Wind about 40-45t/h, cold Secondary Air about 50-55t/h.The secondary air flow of 600MW unit is usually in 1600t/h or more, and Secondary Air
Machine surplus is larger, can usually meet the dry required air quantity of biomass.
Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and
It is not limitations of the embodiments of the present invention.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
Exhaustion.Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention etc., should be included in
Within the protection scope of the utility model claims.
Claims (7)
1. a kind of system using coal-burning power plant's Secondary Air dried biomass, including boiler (1) and air preheater (2), special
Sign is, further includes that secondary air fan (5), cold secondary air duct (6), cold Secondary Air bypass (7), hot secondary air duct (14), heat are secondary
Wind bypasses (8), combination drying air duct (9) and biomass drying device (10), and the top of biomass drying device (10), which is equipped with, to be contained
Wet dry wind exports (11)；
Flue gas in boiler (1) enters air preheater (2), and cold Secondary Air enters air preheater (2) by secondary air fan (5)
Hot Secondary Air is heated to form with flue gas heat exchange；Hot Secondary Air bypass is set at the hot secondary air duct (14) of air preheater outlet
(8) the hot Secondary Air of extraction section, while cold Secondary Air bypass (7) is set at the cold secondary air duct (6) into before air preheater
The cold Secondary Air of extraction section；The combination drying heat of hot Secondary Air and the mixed Secondary Air of cold Secondary Air as biomass drying
Wind；Combination drying hot wind is sent into biomass drying device (10) by combination drying air duct (9), does to biomass fuel
It is dry.
2. utilizing the system of coal-burning power plant's Secondary Air dried biomass as described in claim 1, which is characterized in that the life
Matter drying apparatus (10) is equipped with biomass feed inlet (12) and biomass discharge port (13).
3. utilizing the system of coal-burning power plant's Secondary Air dried biomass as claimed in claim 1 or 2, which is characterized in that mixed
It closes and flow measuring point and temperature point is housed on dry air duct (9).
4. utilizing the system of coal-burning power plant's Secondary Air dried biomass as claimed in claim 1 or 2, which is characterized in that described
Hot Secondary Air bypass (8) and cold Secondary Air bypass (7) be respectively provided with flow controllable register.
5. utilizing the system of coal-burning power plant's Secondary Air dried biomass as claimed in claim 1 or 2, which is characterized in that described
Hot Secondary Air bypass (8) and cold Secondary Air bypass (7) be respectively provided with shutoff door.
6. utilizing the system of coal-burning power plant's Secondary Air dried biomass as claimed in claim 1 or 2, which is characterized in that described
Biomass drying device (10) be concurrent flow belt biomass drying device.
7. utilizing the system of coal-burning power plant's Secondary Air dried biomass as claimed in claim 1 or 2, which is characterized in that described
The distributed multilevel conveyor belt up and down of biomass drying device (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821210144.XU CN208779872U (en) | 2018-07-27 | 2018-07-27 | A kind of system using coal-burning power plant's Secondary Air dried biomass |
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| CN201821210144.XU CN208779872U (en) | 2018-07-27 | 2018-07-27 | A kind of system using coal-burning power plant's Secondary Air dried biomass |
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| CN208779872U true CN208779872U (en) | 2019-04-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251748A (en) * | 2021-05-18 | 2021-08-13 | 山东大学 | Solar heat collection, storage and drying system for biomass power plant fuel |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251748A (en) * | 2021-05-18 | 2021-08-13 | 山东大学 | Solar heat collection, storage and drying system for biomass power plant fuel |
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