CN207632751U - A kind of Biomass Gasification in Circulating Fluidized Bed device - Google Patents
A kind of Biomass Gasification in Circulating Fluidized Bed device Download PDFInfo
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Abstract
The utility model is related to a kind of Biomass Gasification in Circulating Fluidized Bed devices, the air feed mechanism that is connect including fluidized gasification furnace body, with fluidized gasification furnace body bottom end, the feeder being arranged on fluidized gasification furnace body side and the primary cyclone and material returning device that ciculation fluidized structure is formed with fluidized gasification furnace body, the fluidized gasification furnace body, primary cyclone and material returning device are connected with each other successively, and the material returning device is separately connected material return blower and steam feed mechanism.Device provided by the utility model using steam returning charge avoids that returning charge slagging occurs.
Description
Technical field
The utility model is related to biomass thermal chemical device technical fields, and in particular to a kind of biomass circulating fluidized bed gas
Makeup is set.
Background technology
Gasification is the important means of the organic wastes clean utilization such as coal, biomass, rubbish, sludge, is had been widely used
In fields such as chemical industry, metallurgy, civilian and industrial combustion gas.The performance of gasification technology directly influences the sound development of these industries,
There is very important status in its energy-saving and emission-reduction control aspect, be the important leverage that it realizes national relevant control target.Coal
Charcoal gasification technology has had the development course of upper a century, and the gasification technology of the organic wastes such as biomass is from the eighties in last century
Also it is developed rapidly.
In recent years, the attention with country to biomass utilization technologies, gasification of biomass coupled electricity-generation technology is with its scale
Flexibly, generating efficiency is high, obtains Devoting Major Efforts To Developing.Biomass gasification technology by gasification furnace can be divided into bed technology (updraft type,
Downdraft, horizontal draft) and fluidization (bubbling bed, circulation fluidized bed, double-fluidized-bed).Wherein, fixed-bed gasification furnace is simple in structure
But scale is smaller, fuel tolerance is poor, and temperature is not uniform enough, and heat transfer is poor, and temperature is difficult to control in gasification of biomass, and flows
Change bed gasification furnace treatment scale is larger, and temperature is uniform, and amplification is easy, and is suitble to biomass resource compared with the area of concentration.
But fluidized-bed gasification furnace in the prior art is remained on there is many defects, such as Chinese invention patent (CN
106675660 A) a kind of efficient circulating fluid bed gasification installation, including riser and separator, the connection of separator lower part are disclosed
There are material returning device, material returning device side to be connect with riser.When material returning device returns semicoke coarse powder foldback in riser, foldback elegance is empty
Enraged wind is easy to cause solid carbon particles burning, causes returning charge slagging.
For another example Chinese invention patent (103216843 A of CN) discloses a kind of biomass gasification fired boiler, including phase successively
Primary separator, second-stage separator, gas fired-boiler and back-end surfaces even.Biological fuel gas passes through a second-stage separator dedusting
Enter gas fired-boiler afterwards to burn, lacks the absorption of flying dust, be easy to cause alkali metal clogging problems on boiler and back-end surfaces
With tar clog problem.
Accordingly, it is desirable to provide a kind of novel biomass circulating fluidized bed, avoids that returning charge slagging occurs and reduces alkali gold
Belong to the harm come with tar zone.
Utility model content
The purpose of this utility model is that in view of the deficiencies of the prior art, providing a kind of Biomass Gasification in Circulating Fluidized Bed dress
It sets, using steam returning charge, avoids that returning charge slagging occurs.
Technical solution provided by the utility model is：
A kind of Biomass Gasification in Circulating Fluidized Bed device, including fluidized gasification furnace body and fluidized gasification furnace body
The air feed mechanism of bottom end connection, the feeder that is arranged on fluidized gasification furnace body side and with fluid bed gas
Change primary cyclone and material returning device that furnace body forms ciculation fluidized structure, the fluidized gasification furnace body, level-one rotation
Wind separator is connected with each other successively with material returning device, and the material returning device is separately connected material return blower and steam feed mechanism.
In the above technical solution, when device cold start, material returning device uses material return blower air blast, material return blower logical
Ajutage is crossed with material returning device to be connected；Into after working condition, using steam feed mechanism, steam blast returning charge is switched to, is prevented
The possibility of fuel gas buring can be ensured returning charge reliability, while steam has the function of temperature control, and gasification is made to transport by air blast
Row is more stable.
Preferably, it is 700-900 DEG C that the fluidized gasification furnace body, which uses air and steam gasification, running temperature,
The intrinsic operating air velocity of fluidized-bed gasification furnace is 3-5m/s.
Preferably, the material returning device includes returning charge room and feed space, and returning charge room is connect with fluidized gasification furnace body, charging
Room is connect with primary cyclone, centre with band intercommunicating pore partition board separate, be also provided on material returning device scum pipe, access hole,
Pressure-measuring pipe and temperature measuring point.Material returning device realizes material back-conveying to fluidized gasification furnace body, and material returning device bottom is air compartment, is separately connected
Material return blower and steam feed mechanism, can air blast or drum steam returning charge.Further preferably, the material return blower is roots blower.
Material returning device bottom drum steam plays the role of preventing fuel gas return-flow and returning charge, and the complete material particles of unreacted are by one
Grade cyclone separator enters material returning device by sealing leg, and U-shaped route is undergone in material returning device, stream is re-delivered to from returning charge leg
Change bed gasification furnace ontology, completes the cycle of material.
Preferably, it is equipped with steam superheater successively on the burning line in the primary cyclone exit, steam is sent out
Raw device, secondary cyclone and device for cooling ash.Combustion gas is detached by primary cyclone, and from its top, burning line is discharged,
The separation for realizing solid (coke, ash content, bed material) and combustion gas, passes sequentially through steam superheater and steam generator exchanges heat,
Combustion gas is cooled to 500 DEG C hereinafter, alkali metal and tar are adsorbed in the grey branch in whole process in combustion gas.Steam generator outlet
Secondary cyclone is passed through in combustion gas, and the combustion gas of secondary cyclone outlet can be generated electricity with the boiler combustion of power transmission factory, separation
Semicoke is sent to molding machine molding after device for cooling ash cools down, with circulating nitrogen gas sealing.Since secondary cyclone is arranged in tail
After portion's heating surface so that flying dust can adsorb more tar and alkali metal before being detached, and reduce the slagging of heat-transfer surface,
Ensure the utilization of heat, improves overall thermal efficiency；Secondly, it reduces follow-up combustion gas and blocks wind using the tar of device and pipeline
Danger.
Preferably, the steam feed mechanism includes cold water source, the water-supply line equipped with feed pump and is equipped with described
The steam pipe line of steam superheater and the steam generator；The cold water source, water-supply line, steam pipe line and material returning device according to
Secondary connection.Cold water is transported to steam generator and steam superheater by water-supply line, by the heat exchange with combustion gas, can obtain
To superheated steam, temperature reaches 450 DEG C, and superheated steam is admitted in material returning device, is used for steam returning charge.Further preferably, pass through
Outer comb can be set on the steam pipe line of the steam superheater, extra superheated steam is sold for sending outside.
Preferably, feed pump, device for cooling ash, oxygen-eliminating device, level-one economizer and two level are equipped on the water-supply line successively to save
Coal device, the water-supply line end connect steam generator.Further preferably, it is additionally provided with pressure pump on the water-supply line,
The pressure pump is set between oxygen-eliminating device and level-one economizer.
Preferably, first circulation pipeline, the first circulation pipe are equipped with by the steam pipe line of the steam superheater
Line is sequentially connected two level economizer, level-one economizer and oxygen-eliminating device.The setting recycles extra superheated steam, and utilizes
Level-one economizer and two level economizer are preheated in water so that saturated water temperature when into steam generator reaches 300
℃.And recirculated water after cooling is then converged by oxygen-eliminating device, oxygen-eliminating device can not only remove the oxygen in water, while may be used also
For converging for recirculated water.
Preferably, the air feed mechanism includes pressure fan and air line；The air line connects fluid bed gas
Change the bottom end of furnace body, level-one air preheater, two level air preheater and three-level air preheater are equipped with successively on the air line.
Preferably, second circulation pipeline, the second circulation pipe are equipped with by the steam pipe line of the steam superheater
Line is sequentially connected pressure reducer, three-level air preheater, two level air preheater, level-one air preheater and oxygen-eliminating device.The setting is by extra overheat
Steam circulation utilizes, and air is heated to 260 DEG C using three-level air preheater, two level air preheater and level-one air preheater, is sent into stream
The air compartment for changing bed gasification furnace body bottom portion, fluidizes bed material by the blast cap Even air distribution on air distribution plate, and as gasifying agent and
Gasification reaction occurs for biomass material.
Preferably, it is equipped with third pipeloop by the water-supply line of the device for cooling ash；On the third pipeloop
Equipped with cooling tower, third pipeloop both ends are connected to the input end of feed pump and the outlet end of device for cooling ash.This sets
It sets the water circulation use by device for cooling ash heating, reduces water resource waste.
Preferably, the feeder includes ground feed bin, elevator, hopper and auger feeder；The fluid bed gas
Change furnace body to connect with hopper by auger feeder.The feeder allows to using solid forming biomass as gasification
Raw material, and solid forming adaptability to raw material is good, convenient transportation.
Preferably, the auger feeder includes sequentially connected level-one auger feeder and two level auger feeder.
When feeding system is run, biomass material is delivered to aerial hopper from ground feed bin by elevator.Feed hopper bottom
Two uniform material togglings of setting gauge avoid level-one auger feeder pressure-bearing to level-one auger feeder.Level-one auger feeder is to become
Screw pitch flood dragon ensures that exit discharging is unobstructed and does not block, then raw material is sent into fluidized-bed gasification furnace by two level auger feeder
Ontology.It avoids biological particles from putting up a bridge using setting gauge, continuous uniform feed is ensured using varying pitch auger, and two level auger adds
Glassware is quickly to be fed, it is ensured that material, which is sent into rapidly in fluidized gasification furnace body, to react.
Compared with the existing technology, the beneficial effects of the utility model are embodied in：
(1) Biomass Gasification in Circulating Fluidized Bed device provided by the utility model avoids carbon using cyclic steam returning charge
Returning charge slagging occurs for particle burning.
(2) Biomass Gasification in Circulating Fluidized Bed device provided by the utility model, secondary cyclone is arranged in
After back-end surfaces so that flying dust can adsorb more tar and alkali metal before being detached, and reduce the knot of heat-transfer surface
Slag ensures the utilization of heat, improves overall thermal efficiency, reduces tar and blocks risk.
(3) Biomass Gasification in Circulating Fluidized Bed device provided by the utility model, using first circulation pipeline with unification
Grade economizer and two level economizer are preheated in water so that and saturated water temperature when into steam generator reaches 300 DEG C,
Reduce the condensate corrosion of steam generator.
(4) Biomass Gasification in Circulating Fluidized Bed device provided by the utility model coordinates three using second circulation pipeline
Air is heated to 260 DEG C by grade air preheater, two level air preheater and level-one air preheater, makes it as gasifying agent realizing gasified reverse
It answers.
Description of the drawings
Fig. 1 is the structural schematic diagram of Biomass Gasification in Circulating Fluidized Bed device in embodiment；
Fig. 2 is operating status figure of the Biomass Gasification in Circulating Fluidized Bed device under specific operating mode in embodiment.
Wherein, 1 is fluidized gasification furnace body；2 be ground feed bin；3 be elevator；4 be hopper；5 add for level-one auger
Glassware；6 be two level auger feeder；7 be primary cyclone；8 be material returning device；9 be roots blower；10 be steam superheating
Device；11 be steam generator；12 be secondary cyclone；13 be drum；14 be cooling tower；15 be pressure reducer；16 be air-supply
Machine；17 be level-one air preheater；18 be two level air preheater；19 be three-level air preheater；20 be feed pump；21 be device for cooling ash；22 for except
Oxygen device；23 be pressure pump；24 be level-one economizer；25 be two level economizer.
Specific implementation mode
With reference to specific embodiment, the utility model is described in further detail.
Embodiment：
Biomass Gasification in Circulating Fluidized Bed device as shown in Figure 1, including fluidized gasification furnace body 1 and fluid bed gas
The air feed mechanism for changing the connection of 1 bottom end of furnace body, the feeder being arranged on 1 side of fluidized gasification furnace body, and
The primary cyclone 7 and material returning device 8 of ciculation fluidized structure are formed with fluidized gasification furnace body 1.
Fluidized gasification furnace body 1 includes top dilute-phase zone, lower part emulsion zone and bottom plenum, fluidized-bed gasification furnace sheet
The bottom plenum side of body 1 is connected equipped with bumer of light fuel with 1 air compartment of fluidized gasification furnace body, fluidized gasification furnace body 1
Air compartment top is equipped with air distribution plate and blast cap.
Feeder includes ground feed bin 2, elevator 3, hopper 4, level-one auger feeder 5 and two level auger feeder 6.
When feeding system is run, biomass material is delivered to aerial hopper 4 from ground feed bin 2 by elevator 3.4 bottom of hopper two
The uniform material toggling of setting gauge avoids 5 pressure-bearing of level-one auger feeder to level-one auger feeder 5.Level-one auger feeder 5 is to become spiral shell
Away from flood dragon, ensures that exit discharging is unobstructed and do not block, then raw material is sent by fluidized-bed gasification furnace sheet by two level auger feeder 6
The top dilute-phase zone in fluidized gasification furnace body 1 is arranged in body 1, the biomass material import of fluidized gasification furnace body 1.
The air feed mechanism being connect with 1 bottom plenum of fluidized gasification furnace body includes pressure fan 16 and air line,
Air line connects the bottom plenum of fluidized-bed gasification furnace ontology 1, and level-one air preheater 17, two level are also equipped with successively on air line
Air preheater 18 and three-level air preheater 19.
Fluidized gasification furnace body 1, primary cyclone 7 and material returning device 8 are connected with each other successively, form ciculation fluidized knot
Structure.Material returning device 8 includes returning charge room and feed space, and returning charge room is connect with fluidized gasification furnace body 1, feed space and one cyclonic point
It is connected from device 7, centre is separated with band intercommunicating pore partition board, and scum pipe, access hole, pressure-measuring pipe and thermometric are also provided on material returning device 8
Point.Material returning device 8 realizes material back-conveying to fluidized gasification furnace body 1, and 8 bottom of material returning device is air compartment, is separately connected roots blower 9
It, can air blast or drum steam returning charge with steam feed mechanism.
Steam superheater 10, steam generator 11, two are equipped on the burning line in 7 exit of primary cyclone successively
Grade cyclone separator 12 and device for cooling ash 21.Combustion gas is detached by primary cyclone 7, real from its top burning line discharge
The separation of existing solid (coke, ash content, bed material) and combustion gas, passes sequentially through steam superheater 10 and steam generator 11 is changed
Heat, combustion gas cool down, grey branch absorption alkali metal and tar in whole process in combustion gas.The combustion gas warp that steam generator 11 exports
Secondary cyclone 12 is crossed, the combustion gas that secondary cyclone 12 exports can be generated electricity with the boiler combustion of power transmission factory, and the half of separation
Coke is sent to molding machine molding after the cooling of device for cooling ash 21, with circulating nitrogen gas sealing.
Steam feed mechanism include cold water source, the water-supply line equipped with feed pump 20 and be equipped with 10 and of steam superheater
The steam pipe line of steam generator 11, wherein cold water source, water-supply line, steam pipe line and material returning device 8 are sequentially connected.And water supply
Feed pump 20, device for cooling ash 21, oxygen-eliminating device 22, pressure pump 23, level-one economizer 24 and two level economizer are equipped on pipeline successively
25, water-supply line end connects steam generator 11, and steam generator 11, drum 13 and steam are then equipped with successively on steam pipe line
Superheater 10.Wherein, steam superheater 10 and steam generator 11 use serpentine structure.
Wherein, it is divided into four pipelines by the steam pipe line of steam superheater 10, first pipeline is first circulation pipeline,
First circulation pipeline is sequentially connected two level economizer 25, level-one economizer 24 and oxygen-eliminating device 22.Article 2 pipeline is second circulation
Pipeline, second circulation pipeline are sequentially connected pressure reducer 15, three-level air preheater 19, two level air preheater 18, level-one air preheater 17 and remove
Oxygen device 21.Article 3 pipeline directly sends extra superheated steam outside.And Article 4 pipeline is then connected to material returning device 8 for realizing steaming
Vapour returning charge.
In addition, being additionally provided with third pipeloop on water-supply line by device for cooling ash 21, third pipeloop is equipped with cold
But tower 14, both ends are connected to the input end of feed pump 20 and the outlet end of device for cooling ash 21, which will pass through device for cooling ash 21
The water circulation use of heating reduces water resource waste.
The course of work：
When device starts, pressure fan 16 is first turned on, is added using the bumer of light fuel igniting under fluidized gasification furnace body 1
Hot air chamber and burner hearth wait for that furnace temperature is raised to 600 DEG C, and gradually plus biomass material burns, and heats entire burner hearth, material returning device 8 is adopted at this time
With 9 air blast of roots blower.
After the system stabilizes, material returning device 8 switches steam blast, is further added by biomass feeding amount, waits exporting no extra oxygen
After amount, into vaporized state, air quantity, when 1 temperature drop of fluidized gasification furnace body is to 700-900 DEG C, system stable operation are adjusted.
When system stable operation, the biomass material after crushing enters fluidized gasification by hopper 4 by auger feeder
In furnace body 1, the pyrolytic gasification under the heating of high temperature bed material and air, steam combustion supporting, using preheated air air blast.Output
Combustion gas and solid particulate matter enter primary cyclone 7 through the outlet of fluidized gasification furnace body 1, and semicoke is passed through in company with recycle stock
Cross separation after fall into material returning device 8, by 8 bottom of material returning device blast steam return to fluidized gasification furnace body 1 carry out it is next
The gasification of wheel.
Fluidized gasification furnace body 1 exports high-temperature fuel gas after 7 dedusting of primary cyclone, passes through steam superheating successively
Device 10, steam generator 11 exchange heat, and combustion gas itself is cooled to 475 DEG C or so.11 outlet gas of steam generator enters two
Grade cyclone separator 12, the semicoke under detaching send molding machine molding to take out after the cooling of device for cooling ash 21, secondary cyclone 12
The combustion gas power transmission factory boiler combustion power generation of outlet.
It is below the variable condition of air, combustion gas and steam under specific operating mode, as shown in Fig. 2, being only to illustrate device
Technique effect does not define protection domain.
Wherein, air flow is as follows：Cold air into fashionable temperature be 20 DEG C, using 16 pressure air blowing of pressure fan, air capacity
For 20366Nm3/ h, 77 DEG C are preheated to by level-one air preheater 17,222 DEG C are preheated to by two level air preheater 18, by three-level
Air preheater 19 is preheated to 260 DEG C, is sent into the air compartment of 1 bottom of fluidized gasification furnace body, uniformly matches by the blast cap on air distribution plate
Wind fluidizes bed material, and gasification reaction occurs as gasifying agent and biomass material.
Fuel gas flow path is as follows：Combustion gas generates in fluidized gasification furnace body 1, and temperature is 750 DEG C, and gas quantity is
41244.7Nm3/ h is exported in fluidized gasification furnace body 1 and is entered the progress gas-solid of primary cyclone 7 with the speed of 25m/s
Separation enters back-end surfaces after the discharge of separator top vent pipe, passes sequentially through steam superheater 10 and steam generator
11 exchange heat, and fuel gas temperature is cooled to 475 DEG C, and entering secondary cyclone 12 with the speed of 25m/s is detached.
Steam flow is as follows：30 DEG C of cold water flows are 5163kg/h, be 8163kg/h by the pressurization flow of feed pump 20,
1MPa continues through device for cooling ash 21 cools and isolates half defocused temperature and reaches 80 DEG C, total flow 8165kg/h.Wherein,
3002kg/h is cooled and returned to 21 entrance of device for cooling ash cycle by cooling tower 14, remaining 5163kg/h enters the remittance of oxygen-eliminating device 22
Collection.175 DEG C, rate of discharge 10889kg/h of 22 exit water temperature degree of oxygen-eliminating device, is heated to 277 DEG C by level-one economizer 24 successively,
The heating of two level economizer 25 reaches 311 DEG C of saturated water, and 450 DEG C are heated into steam generator 11 and steam superheater 10,
10MPa superheated steams.
3965kg/h is extracted in superheated steam and is sent to two level economizer heating water supply, is become after two level economizer 25
311 DEG C of saturated vapors become 311 DEG C of saturated waters after continuing through level-one economizer 24, finally enter back into oxygen-eliminating device 22 and collect；It takes out
Enter steam type airheater after taking 1762kg/h to be decompressed to 4MPa and heat air, becomes 250 DEG C after three-level air preheater 19
Saturated vapor becomes 250 DEG C of saturated waters after two level air preheater 18, becomes 100 DEG C of condensed waters after three-level air preheater 17,
Collect later into oxygen-eliminating device 22；1510kg/h steam is extracted to use as returning charge steam；Remaining 3653kg/h steam is sent outside.
Claims (10)
1. a kind of Biomass Gasification in Circulating Fluidized Bed device, including fluidized gasification furnace body and fluidized gasification furnace body bottom
Hold air feed mechanism, the feeder being arranged on fluidized gasification furnace body side and and the fluidized gasification of connection
Furnace body forms the primary cyclone and material returning device of ciculation fluidized structure, which is characterized in that the fluidized-bed gasification furnace sheet
Body, primary cyclone and material returning device are connected with each other successively, and the material returning device is separately connected material return blower and steam supply machine
Structure.
2. Biomass Gasification in Circulating Fluidized Bed device according to claim 1, which is characterized in that the one cyclonic separation
Steam superheater, steam generator, secondary cyclone and device for cooling ash are equipped on the burning line in device exit successively.
3. Biomass Gasification in Circulating Fluidized Bed device according to claim 2, which is characterized in that the steam feed mechanism
Water-supply line including cold water source, equipped with feed pump and the steam equipped with the steam superheater and the steam generator
Pipeline；The cold water source, water-supply line, steam pipe line and material returning device are sequentially connected.
4. Biomass Gasification in Circulating Fluidized Bed device according to claim 3, which is characterized in that on the water-supply line according to
It is secondary to be equipped with feed pump, device for cooling ash, oxygen-eliminating device, level-one economizer and two level economizer, the water-supply line end connection steam hair
Raw device.
5. Biomass Gasification in Circulating Fluidized Bed device according to claim 4, which is characterized in that pass through the steam superheating
The steam pipe line of device is equipped with first circulation pipeline, and the first circulation pipeline is sequentially connected two level economizer, level-one economizer
And oxygen-eliminating device.
6. Biomass Gasification in Circulating Fluidized Bed device according to claim 4, which is characterized in that the air feed mechanism
Including pressure fan and air line；The bottom end of air line connection fluidized-bed gasification furnace ontology, on the air line according to
It is secondary to be equipped with level-one air preheater, two level air preheater and three-level air preheater.
7. Biomass Gasification in Circulating Fluidized Bed device according to claim 6, which is characterized in that pass through the steam superheating
The steam pipe line of device is equipped with second circulation pipeline, and the second circulation pipeline is sequentially connected pressure reducer, three-level air preheater, two level
Air preheater, level-one air preheater and oxygen-eliminating device.
8. Biomass Gasification in Circulating Fluidized Bed device according to claim 4, which is characterized in that by the device for cooling ash
Water-supply line is equipped with third pipeloop；The third pipeloop is equipped with cooling tower, third pipeloop both ends
It is connected to the input end of feed pump and the outlet end of device for cooling ash.
9. Biomass Gasification in Circulating Fluidized Bed device according to claim 1, which is characterized in that the feeder includes
Ground feed bin, elevator, hopper and auger feeder；The fluidized gasification furnace body is connected by auger feeder and hopper
It connects.
10. Biomass Gasification in Circulating Fluidized Bed device according to claim 9, which is characterized in that the auger feeder
Including sequentially connected level-one auger feeder and two level auger feeder.
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| CN107739630A (en) * | 2017-11-21 | 2018-02-27 | 浙江大学 | A kind of Biomass Gasification in Circulating Fluidized Bed device |
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