CN105505478A - Device and method for purifying crude fuel gas through electrical cyclone streamer corona biomass gasification - Google Patents
Device and method for purifying crude fuel gas through electrical cyclone streamer corona biomass gasification Download PDFInfo
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- CN105505478A CN105505478A CN201510868340.0A CN201510868340A CN105505478A CN 105505478 A CN105505478 A CN 105505478A CN 201510868340 A CN201510868340 A CN 201510868340A CN 105505478 A CN105505478 A CN 105505478A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/026—Dust removal by centrifugal forces
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/028—Dust removal by electrostatic precipitation
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/10—Nitrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/16—Hydrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/20—Carbon monoxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/22—Carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/24—Hydrocarbons
- B01D2256/245—Methane
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a device and method for purifying crude fuel gas through electrical cyclone streamer corona biomass gasification. The device comprises an electrical cyclone reactor; the electrical cyclone reactor comprises a cylindrical upper cavity and a conical lower cavity; a tangential crude fuel gas inlet is formed in the upper edge of the cylindrical upper cavity; a clean fuel gas outlet is communicated with the cylindrical upper cavity; one end, communicated with the cylindrical upper cavity, of the clean fuel gas outlet is inserted into the cylindrical upper cavity; a metal hollow electrode bar is placed in the center of a electrical cyclone reactor shaft; one to four groups of saw-toothed discharge tips are arranged on the electrode bar, are perpendicular to the axis of the electrode bar and are fixed to the electrode bar in a helicoid manner. The device and the method have the benefits that tar molecules in the crude fuel gas are rapidly cracked into small molecular gases such as CO, H2, CH4 and CO2 in a streamer developing process, and rapid gas-solid separation is realized by combining coupled acting force of an electric field and a centrifuge field to dust, so that efficient dust removal is realized.
Description
Technical field
The present invention relates to the thick gas cleaning device of a kind of gasifying biomass and method, especially utilize electric tornado flow photoelectricity corona plasma to remove the coal-tar middle oil apparatus and method with dust of thick combustion gas simultaneously.
Background technology
Gasifying biomass obtains one of thick combustion gas more effectively conversion means, Wood Adhesives from Biomass can be become high-grade geseous fuel, both can be used for industrial generation, cogeneration, central gas supply, industrial heating heat supply; The process such as synthetic liquid fuel, fuel cell that also can be provides source of the gas.
Based on different reactor pattern and variation of operating parameters, the thick combustion gas that gasifying biomass obtains contain quantity not wait tar and dust.Tar is defined as the organic pollutant that molecular weight is more than or equal to benzene; Dust comprises flying dust, bed material and does not burn carbon residue, and both harm can be summarized as: 1) increase gas sweetening intractability and complexity; 2) tar light oil can cause water pollution as phenol is dissolved in washing water, and as naphthalene can form Crystallization Plugging valve and generating set, condensation occurs other heavy tar below 350 DEG C can block oil engine side cooler; 3) the corrodible oil engine of tar acidic components or internal combustion turbine cylinder; 4) be applied to the occasions such as F-T synthesis or fuel cell, catalyst surface carbon distribution inactivation can be caused, need frequent regeneration and increase replacement cost; 5) system gasification efficiency and efficiency of energy utilization is reduced.Therefore, thick combustion gas just can be used after having to pass through deep purifying.
The coal-tar middle oil purification techniques of prior art mainly contains following several: 1) physical removal, 2) thermo-cracking; 3) catalytic pyrolysis.
Physical removal comprises dry type and wet purification two kinds of modes, and common equipment has cyclonic separator, sack cleaner, Venturi scrubber, electrostatic precipitator, spray column etc., and physical removal mode, while purifying and stive, also has tar and certain removes effect.But these dust removal installations are all poor to the decontamination effect improving of tar, just good effect to can be reached with other coke tar cracking equipment couplings.
Thermo-cracking refers to the tar pyrolytic decomposition of temperature of reaction more than 900 DEG C, can produce the higher macromolecular substance of thermostability, and generate a small amount of soot while pyrolysis fuel oil.Because thus this process need thick gas product that heats up exists the higher shortcoming of energy consumption, and a part of combustible gas can be burnt in thermal cracking processes thus sacrifice the calorific value of synthetic gas.
In stove or the outer catalytic pyrolysis of stove make tar low temperature pyrolyzer become possibility, and tar ingredients is cracked into light gas by selectivity, thus can increase the calorific value of synthetic gas; But there is the low deficiency such as frangible of catalyst surface carbon distribution, life-span short, physical strength.
Remove for dust in addition, cyclonic separator is common dust removal device, and more than 20 μm particles are had to the clearance of >95%, but diminish with dust size, clearance sharply declines.And research shows to take wood as the fixed bed gasification technique of raw material, in synthetic gas, the particle of particle diameter less than 5 μm can account for about 75% of total particle mass fraction.Therefore for improving efficiency of dust collection, the mode that multistage cyclone is connected in practical application, is often adopted; In addition in order to strengthen the seizure effect to less than 5 μm dust, usually in downstream, the equipment such as wet scrubber, cloth bag, electric precipitator can be installed.Wet scrubber take generally water as medium, and thus service temperature is lower than 100 DEG C, and this oil engine for downstream or reforming reactor will inevitably lose thick combustion gas sensible heat.Sack cleaner service temperature is slightly high and can filter the particle of 0.5-100 μm, but be limited to the thermotolerance of filtering cloth material, service temperature is generally below 250 DEG C, this is obviously unfavorable for processing the thick combustion gas simultaneously containing tar, dust, is removed by the mode of rapping, blowback because heavy tar is extremely difficult after condensing in cloth bag surface.Another kind of method for dust removal is electrostatic precipitation, and adopt the principle of work of the electrostatic precipitator of electrostatic precipitation to be utilize high-voltage electric field to make flue gas occur ionize and make dust charged, under the effect of electrical forces, realize dust be separated with flue gas, to less than the 20 μm particles being especially less than 5 μm, there is the clearance up to 95-99%.But for thick combustion gas dust purification, tar dust is easily attached to dust collecting electrode, causes charge accumulation along with dust layer thickens simultaneously, forms internal field and repel follow-up dust deposit, produce inverse corona and reentrainment of dust, thus make efficiency of dust collection degradation.Porcelain filter can operate and obtain good dust-filtering effect under 600-800 DEG C of high temperature, but existence involves great expense and the shortcoming of cracky.
As can be seen here, one of thick gas-purification technical bottleneck problem being still gasifying biomass industrial application in prior art, this mainly contains following 2 reasons:
1) be different from waste-gas cleaning, background gas and thick combustion gas must be reclaimed, and namely scavenging process can not reduce thick combustion gas unit volume calorific value or H
2/ CO mol ratio;
2) tar, dust two kinds of pollutents are present in synthetic gas simultaneously, they separately being carried out process must keep in check in another kind of pollutant purification process: such as first dedusting after purification tar scheme, can only adopt and tar existence form can be kept to be the high-temperature dust removal of gaseous state, and the purge gas flow in dust removal process is unsuitable excessive, otherwise can reduce flow rate; Such as adopt again first performing catalytic pyrolysis on tar dust-cleaning scheme again, then face the problem that dust constantly deposits at catalyst surface.
Therefore prior art haves much room for improvement and develops.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of electric tornado flow photoelectricity simultaneously can removing tar and dust and swoons the thick gas cleaning device of gasifying biomass and method.
Technical solution of the present invention is:
A kind of electric tornado flow photoelectricity is swooned the thick gas cleaning device of gasifying biomass, comprise and being made of metal and the electric cyclone reactor of ground connection, this electric cyclone reactor comprises cylindrical upper cavity and coniform lower chamber, and arranges tangential thick gas inlet at described cylindrical upper cavity upper limb;
Cylindrical upper cavity is connected with clean fuel gas outlet, and described clean fuel gas exports the one end be connected with described cylindrical upper cavity and inserts in described cylindrical upper cavity;
Place metal hollow electrode bar at described electric cyclone reactor axle center, the position that this electrode bar is connected with described electric cyclone reactor has insulating material to isolate; Described electrode bar one end is stretched out outside described electric cyclone reactor and is connected with streamer corona plasma power supply; The other end puts in described electric cyclone reactor, and the one end putting in described electric cyclone reactor is provided with the nozzle that power pole gas enters more than 1 group of described electric cyclone reactor, often organize nozzle is not less than 2mm perpendicular to the diameter that described electrode bar arranges outlet containing 2-8, often organize nozzle preferably containing 4 outlets; And on described electrode bar, being provided with the jagged discharge tip of 1 to 4 group, this discharge tip is also fixed on described electrode bar in the shape of a spiral perpendicular to described electrode bar axle center.
The effect of nozzle provides passage for electrode gas enters reactor, electrode gas needs even dispersion in reactor, can according to practical situation, the number of nozzle is The more the better, based on electrode bar limited diameter of the present invention, jet exit also has certain size, and too many jet exit may be unfavorable for installing, therefore nozzle quantity of the present invention is 2-8.
By the electric discharge of discharge tip, stable streamer can be produced in reactor, these streamers can charged to dust, to coke tar cracking, discharge tip is The more the better in principle, but too much may cause: 1) installing space is inadequate; 2) energy consumption increases; Therefore the present invention is preferably 1-4 group.
The outlet of described clean fuel gas insert one end in described cylindrical upper cavity lower along face lower than the lower distance being not less than 10cm along face of described thick gas inlet.
If the outlet pipe of clean fuel gas is concordant with fuel gas inlet pipe or higher, thick combustion gas short circuit may be caused, in reactor, do not form whirlpool, directly from exit discharge, not reach the object of gas-purification.The outlet of described clean fuel gas insert one end in described cylindrical upper cavity lower along face lower than the lower distance being not less than 10cm along face of described thick gas inlet; The situation that combustion gas short circuit does not occur can be guaranteed.
Described coniform lower chamber lower end connects ash bucket.
At described electric cyclone reactor ash bucket lower edge, ash discharging hole is set.
The material of described electrode bar is tungsten or stainless steel or copper.
Described electrode gas is air, O
2or one or more in water vapour.
The discharge mode of described electrode bar can be in straight polarity or negative polarity streamer-discahrge any one.
A kind of electric tornado flow photoelectricity is swooned the thick gas-purification method of gasifying biomass, comprises the following steps;
S1: the thick combustion gas of gasifying biomass tangentially enters electric cyclone reactor with the speed of 12-20m/s along electric cyclone reactor excircle;
S2: the metal hollow electrode bar connection streamer corona plasma power supply being positioned at described electric cyclone reactor axle center carries out point discharge, and tar is cracked into CO, CH under streamer corona plasma effect
4, H
2, CO
2deng gas, be subject to when dust is in reactor the acting in conjunction of electrical forces and centrifugal field force and combustion gas body portion from, accumulate in the dust collecting electrode of electric cyclone reactor, and drop to ash bucket further under gravity, to remove the dust in thick combustion gas.
Beneficial effect of the present invention:
1) utilize streamer corona discharge to produce the performance of free radical pyrolysis fuel oil under living radical and streamer corona condition, make the tar molecules in thick combustion gas be cracked into CO, H rapidly in streamer evolution
2, CH
4, CO
2deng micro-molecular gas.
2) the ion pair dust utilizing streamer corona field to produce is charged, and realizes gas-solid rapid separation in conjunction with the coupling power of electric field-centrifuge field to dust; Avoid dust and tar to be polymerized in dust collecting electrode to condense, realize efficient removal dust.
3) tar purifying and dust are removed two kinds of pollutant purification PROCESS COUPLING to carry out at single reaction vessel, save equipment investment cost and running cost, while realizing the upgrading of the gasifying biomass thick combustion gas degree of depth, improve CO, H of thick combustion gas
2, CH
4content.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is electrode bar structural representation of the present invention;
Fig. 3 is that Fig. 2 is along A-A direction view;
Fig. 4 is electrode discharge cutting-edge structure schematic diagram
Fig. 5 is electrode bar assembling schematic diagram.
Description of reference numerals: 1, thick gas inlet; 2, dust collecting electrode; 3, electrode bar; 4, ash bucket; 5, clean fuel gas outlet; 6, electrode gas outlet; 7, discharge tip; 8, electric cyclone reactor; 9, cylindrical upper cavity; 10, coniform lower chamber; 11, ash discharging hole.
Embodiment
Consult Fig. 1 to Fig. 5, a kind of electric tornado flow photoelectricity is swooned the thick gas cleaning device of gasifying biomass, and comprise and being made of metal and the electric cyclone reactor 8 of ground connection, electric cyclone reactor 8 internal surface is the dust collecting electrode 2 of a ground connection.Electricity cyclone reactor 8 is preferably made up of stainless steel; This electric cyclone reactor 8 comprises cylindrical upper cavity 9 and coniform lower chamber 10, and arranges tangential thick gas inlet 1 at cylindrical upper cavity 9 upper limb;
Cylindrical upper cavity 9 is connected with clean fuel gas outlet 5, and one end that clean fuel gas outlet 5 is connected with cylindrical upper cavity 9 is inserted in cylindrical upper cavity 9; And clean fuel gas outlet 5 insert one end in cylindrical upper cavity 9 lower along face lower than the lower distance being not less than 10cm along face of thick gas inlet 1.
Coniform lower chamber 10 lower end connects ash bucket 4; At ash bucket 4 lower edge, ash discharging hole 11 is set.
Place metal hollow electrode bar 3 at electric cyclone reactor 8 axle center, the material of electrode bar 3 is preferably tungsten or stainless steel or copper.
The position that this electrode bar 3 is connected with electric cyclone reactor 8 has insulating material to isolate; Electrode bar 3 one end is stretched out outside electric cyclone reactor 8 and is connected with streamer corona plasma power supply; The other end puts in electric cyclone reactor 8, and the one end putting in electric cyclone reactor 8 is provided with the nozzle that power pole gas enters more than 1 group of electric cyclone reactor 8, and electrode gas is preferably air, O
2or one or more in water vapour.
Often organize nozzle is not less than 2mm electrode gas outlet 6 containing 4 diameters perpendicular to electrode bar arrangement, and on electrode bar 3, be provided with the jagged discharge tip 7 of 1 to 2 group, this discharge tip 7 is also welded on electrode bar 3 in the shape of a spiral perpendicular to electrode bar 3 axle center.The discharge mode of electrode bar 3 can be in straight polarity or negative polarity streamer-discahrge any one.
A kind of electric tornado flow photoelectricity is swooned the thick gas-purification method of gasifying biomass, comprises the following steps;
S1: the thick combustion gas of gasifying biomass tangentially enters electric cyclone reactor 8 with the speed of 12-20m/s along electric cyclone reactor 8 excircle;
S2: the metal hollow electrode bar 3 being positioned at electric cyclone reactor 8 axle center is connected streamer corona plasma power supply and carried out point discharge, and tar is cracked into CO, CH under streamer corona plasma effect
4, H
2, CO
2deng gas, be subject to when dust is in reactor the acting in conjunction of electrical forces and centrifugal field force and combustion gas body portion from, accumulate in the dust collecting electrode 2 of electric cyclone reactor 8, and drop to ash bucket 4 further under gravity, to remove the dust in thick combustion gas.
The vertical cross-section of thick gas inlet 1 is preferably rectangle, the cross-sectional area size of rectangular inlet with thick gas flow and temperature relevant, preferred gas flow rate is 12-20m/s, and cylindrical upper cavity 9 connects coaxial cylindrical clean fuel gas outlet 5.
Utilize said apparatus, thick combustion gas enters into electric cyclone reactor 8 fast by thick gas inlet 1, and under the effect of the streamer corona field formed between electrode bar 3 and reactor wall in reactor, the background gas in thick combustion gas is (as O
2, H
2o, or exported by electrode gas introduce electrode gas) be ionized as positive ion, negative ion, electronics and various living radical group, the tar in above-mentioned plasma body and thick combustion gas collides and makes the latter's prompt activation, and tar molecules is cracked into CO, H
2, CH
4, CO
2deng micro-molecular gas.
Utilize said apparatus, the dust entered in electric cyclone reactor 8 with thick combustion gas is charged, moves under the effect of electrical forces to dust collecting electrode 2; The effect of centrifugal field force in electric cyclone reactor 8 is also subject to by charged dust, dust under the acting in conjunction of electrical forces and centrifugal field force with thick combustion gas body portion from, constantly draw close to the dust collecting electrode 2 of electric cyclone reactor 8 and gather, dropping to ash bucket 4 further under gravity subsequently.The thick combustion gas be cleaned is discharged from clean fuel gas outlet 5.
Embodiment 1:
Adopt fixed-bed gasification furnace, be that raw material carries out air gasification with wood chip, wood chip feeding quantity is 250kg/h, and air flow quantity is 300Nm
3/ h.
Accompanying drawings 1, the wood chip thick combustion gas obtained of gasifying enters electric cyclone reactor by inlet mouth, and electrode bar adopts 5 groups of nozzles, and often organize nozzle containing 4 electrode gas outlets, electrode gas adopts O
2, discharge tip arranges 2 groups, and tar is cracked into CO, CH under streamer corona plasma effect
4, H
2, CO
2deng gas, be subject to when dust is in reactor the acting in conjunction of electrical forces and centrifugal field force and combustion gas body portion from, accumulate in electric cyclone reactor internal surface, enter ash bucket under gravity subsequently.
In this embodiment, the gasification gas main component of acquisition is CO, H
2, CH
4, CO
2deng.By analysis, main composition and the content of the gas that gasifies before and after purification are as shown in table 1, and from table 1, adopt apparatus of the present invention, after thick gas-purification, tar content is from 2343mg/Nm
3drop to 93mg/Nm
3, dust content is from 1256mg/Nm
3drop to 145mg/Nm
3; And H
2, CO, CH
4content slightly rises, it can thus be appreciated that apparatus of the present invention are while the thick combustion gas of purification, also improve the content of inflammable gas, combustion gas quality is significantly improved simultaneously, can be used as the unstripped gas of biomass-based liquid fuels process.
Composition and content before and after the thick gas-purification of table 1
Embodiment 2:
Adopt fixed-bed gasification furnace, be that raw material carries out air gasification with wood chip, wood chip feeding quantity is 250kg/h, and air flow quantity is 300Nm
3/ h.
Accompanying drawings 1, the wood chip thick combustion gas obtained of gasifying enters electric cyclone reactor by inlet mouth, and electrode bar adopts 5 groups of nozzles, and often organize nozzle containing 1,4,8 electrode gas outlet (T1, T2, T3), electrode gas adopts O
2, discharge tip all arranges 2 groups, and tar is cracked into CO, CH under streamer corona plasma effect
4, H
2, CO
2deng gas, be subject to when dust is in reactor the acting in conjunction of electrical forces and centrifugal field force and combustion gas body portion from, accumulate in electric cyclone reactor internal surface, enter ash bucket under gravity subsequently.
In this embodiment, the gasification gas main component of acquisition is CO, H
2, CH
4, CO
2deng.By analysis, main composition and the content of the gas that gasifies before and after purification are as shown in table 2, and from table 2, adopt the electrode bar with Different electrodes gas outlet number nozzle, purify after thick combustion gas through contrive equipment, tar content is from 2343mg/Nm
3drop to 280mg/Nm respectively
3(T1), 93mg/Nm
3(T2), 73mg/Nm
3(T3), dust content is from 1256mg/Nm
3drop to 165mg/Nm
3(T1), 145mg/Nm
3(T2), 125mg/Nm
3(T3); And H
2, CO, CH
4content all slightly rises than the thick combustion gas of entrance, it can thus be appreciated that the number increasing the outlet of electrode gas can improve the removal efficiency of tar, dust, and improve the content of inflammable gas, combustion gas quality is significantly improved simultaneously.
Thick gas-purification effect comparison after table 2 adopts Different electrodes gas to export number
Embodiment 3:
Adopt fixed-bed gasification furnace, be that raw material carries out air gasification with wood chip, wood chip feeding quantity is 250kg/h, and air flow quantity is 300Nm
3/ h.
Accompanying drawings 1, the wood chip thick combustion gas obtained of gasifying enters electric cyclone reactor by inlet mouth, and electrode bar adopts 5 groups of nozzles, and often organize nozzle containing 4 electrode gas outlets, electrode gas adopts O
2, discharge tip arranges 1 (T4), 2 (T2), 4 (T5) group respectively, and tar is cracked into CO, CH under streamer corona plasma effect
4, H
2, CO
2deng gas, be subject to when dust is in reactor the acting in conjunction of electrical forces and centrifugal field force and combustion gas body portion from, accumulate in electric cyclone reactor internal surface, enter ash bucket under gravity subsequently.
In this embodiment, the gasification gas main component of acquisition is CO, H
2, CH
4, CO
2deng.By analysis, main composition and the content of the gas that gasifies before and after purification are as shown in table 3, and from table 3, adopt different discharge tip group number, thick combustion gas is after contrive equipment purification, and tar content is from 2343mg/Nm
3drop to 192mg/Nm respectively
3(T4), 93mg/Nm
3(T2), 28mg/Nm
3(T5), dust content is from 1256mg/Nm
3drop to 277mg/Nm
3(T4), 145mg/Nm
3(T2), 39mg/Nm
3(T5); And H
2, CO, CH
4content all slightly rises than the thick combustion gas of entrance, it can thus be appreciated that increase the removal efficiency that discharge tip group number can improve tar, dust, and improve the content of inflammable gas, combustion gas quality is significantly improved simultaneously.
Table 3 is thick gas-purification effect comparison after adopting different discharge tip group number
Embodiment 4:
Adopt fixed-bed gasification furnace, be that raw material carries out air gasification with wood chip, wood chip feeding quantity is 250kg/h, and air flow quantity is 300Nm
3/ h.
Accompanying drawings 1, the wood chip thick combustion gas obtained of gasifying enters electric cyclone reactor by inlet mouth, and electrode bar adopts axle center arrangement mode, and containing 5 groups of nozzles, often organize nozzle containing 4 electrode gas outlets, electrode gas adopts O
2, discharge tip arranges 2 groups, and tar is cracked into CO, CH under streamer corona plasma effect
4, H
2, CO
2deng gas, be subject to when dust is in reactor the acting in conjunction of electrical forces and centrifugal field force and combustion gas body portion from, accumulate in electric cyclone reactor internal surface, enter ash bucket (T2) subsequently under gravity.
The wood chip thick combustion gas obtained of gasifying enters electric cyclone reactor by inlet mouth, electrode bar adopts non-axle center arrangement mode of the prior art, discharge tip is evenly arranged in escape pipe outside wall surface, and other conditions are same as described above, and the combustion gas after process discharges (T6) by air outlet.
In this embodiment, adopt the thick combustion gas of Different electrodes rod decoration form process, main composition and the content of the gas that gasifies before and after purification are as shown in table 4, and from table 4, adopt 2 kinds of electrode bar decoration forms by after thick gas-purification, tar content is from 2343mg/Nm
3drop to 93mg/Nm respectively
3(T2), 2129mg/Nm
3(T6), dust content is from 1256mg/Nm
3drop to 145mg/Nm
3(T2), 658mg/Nm
3(T6); And adopt axle center arrangement electrode bar mode to significantly improve H
2, CO, CH
4content, it can thus be appreciated that the thick gas-purification of axle center arrangement electrode bar mode and upgrading successful are better than non-axle center arrangement mode.
Table 4 adopts the thick gas-purification effect comparison of Different electrodes rod decoration form
Above-listed detailed description is illustrating for possible embodiments of the present invention, and this embodiment is also not used to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and all should be contained in the scope of the claims of this case.
Claims (8)
1. electric tornado flow photoelectricity is swooned the thick gas cleaning device of gasifying biomass, it is characterized in that:
Comprise and being made of metal and the electric cyclone reactor of ground connection, this electric cyclone reactor comprises cylindrical upper cavity and coniform lower chamber, and arranges tangential thick gas inlet at described cylindrical upper cavity upper limb;
Cylindrical upper cavity is connected with clean fuel gas outlet, and described clean fuel gas exports the one end be connected with described cylindrical upper cavity and inserts in described cylindrical upper cavity;
Place metal hollow electrode bar at described electric cyclone reactor axle center, the position that this electrode bar is connected with described electric cyclone reactor has insulating material to isolate; Described electrode bar one end is stretched out outside described electric cyclone reactor and is connected with streamer corona plasma power supply; The other end puts in described electric cyclone reactor, and the one end putting in described electric cyclone reactor is provided with the nozzle that power pole gas enters more than 1 group of described electric cyclone reactor, often organize nozzle is not less than 2mm perpendicular to the diameter that described electrode bar arranges outlet containing 2-8, and on described electrode bar, being provided with the jagged discharge tip of 1 to 4 group, this discharge tip is also fixed on described electrode bar in the shape of a spiral perpendicular to described electrode bar axle center.
2. electric tornado flow photoelectricity according to claim 1 is swooned the thick gas cleaning device of gasifying biomass, it is characterized in that: described clean fuel gas outlet insert one end in described cylindrical upper cavity lower along face lower than the lower distance being not less than 10cm along face of described thick gas inlet.
3. electric tornado flow photoelectricity according to claim 1 is swooned the thick gas cleaning device of gasifying biomass, it is characterized in that: described coniform lower chamber lower end connects ash bucket.
4. electric tornado flow photoelectricity according to claim 3 is swooned the thick gas cleaning device of gasifying biomass, it is characterized in that: arrange ash discharging hole at described ash bucket lower edge.
5. the electric tornado flow photoelectricity according to Claims 1 to 4 any one is swooned the thick gas cleaning device of gasifying biomass, it is characterized in that: the material of described electrode bar is tungsten or stainless steel or copper.
6. the electric tornado flow photoelectricity according to Claims 1 to 4 any one is swooned the thick gas cleaning device of gasifying biomass, it is characterized in that: described electrode gas is air, O
2or one or more in water vapour.
7. the electric tornado flow photoelectricity according to Claims 1 to 4 any one is swooned the thick gas cleaning device of gasifying biomass, it is characterized in that: the discharge mode of described electrode bar can be in straight polarity or negative polarity streamer-discahrge any one.
8. electric tornado flow photoelectricity is swooned the thick gas-purification method of gasifying biomass, it is characterized in that: comprise the following steps:
S1: the thick combustion gas of gasifying biomass tangentially enters electric cyclone reactor with the speed of 12-20m/s along electric cyclone reactor excircle;
S2: the metal hollow electrode bar connection streamer corona plasma power supply being positioned at described electric cyclone reactor axle center carries out point discharge, and tar is cracked into CO, CH under streamer corona plasma effect
4, H
2, CO
2deng gas, be subject to when dust is in reactor the acting in conjunction of electrical forces and centrifugal field force and thick combustion gas body portion from, accumulate in the dust collecting electrode of electric cyclone reactor, and drop to ash bucket further under gravity, to remove the dust in thick combustion gas.
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| CN105505478B (en) | 2018-04-10 |
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