CN102876567B - Biomass anaerobic fermentation tank stirring and heating method and biomass anaerobic fermentation tank stirring and heating system - Google Patents
Biomass anaerobic fermentation tank stirring and heating method and biomass anaerobic fermentation tank stirring and heating system Download PDFInfo
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- CN102876567B CN102876567B CN201210425008.3A CN201210425008A CN102876567B CN 102876567 B CN102876567 B CN 102876567B CN 201210425008 A CN201210425008 A CN 201210425008A CN 102876567 B CN102876567 B CN 102876567B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 92
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000007789 gas Substances 0.000 claims abstract description 69
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 63
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 53
- 239000000446 fuel Substances 0.000 claims description 42
- 239000001569 carbon dioxide Substances 0.000 claims description 27
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 27
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- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
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- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
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Abstract
The invention discloses a biomass anaerobic fermentation tank stirring and heating method and a biomass anaerobic fermentation tank stirring and heating system, and belongs to the technical field of biomass anaerobic fermentation. Marsh gas and air produced by anaerobic fermentation are subjected to physical separation through different membrane separation devices respectively to produce combustible gas with a high CH4 volume concentration, oxygen-enriched gas and CO2-enriched gas, which are required by oxygen-rich combustion; hot water required by gas-liquid dual-phase jet flow is produced by the oxygen-rich combustion; the hot water of the gas-liquid dual-phase jet flow enters a jet flow nozzle for acceleration, and the CO2-enriched gas is sucked into the nozzle under the suction action of liquid-phase jet flow to form the gas-liquid dual-phase; and a gas-liquid dual-phase jet flow device moves on a track mounted in an anaerobic fermentation tank to form movable and pendular gas-liquid dual-phase jet flow. According to the invention, fermentation raw materials in the fermentation tank are stirred and heated globally through regulation of the movement of the gas-liquid dual-phase jet flow device, so as to enhance heat exchange and mass exchange among the fermentation materials in the anaerobic fermentation tank.
Description
Technical field
The present invention relates to biomass anaerobic fermentation technical field, particularly a kind of biomass anaerobic fermentation stirring and heating means and system thereof.
Background technology
Biomass are a kind of resourceful renewable energy sources, more and more pay attention in the world in the situation of new forms of energy and renewable energy source development and utilization, national governments have strengthened the investment to biomass energy and application technology as the second resource, have accelerated commercial applications scope and the speed of biomass energyization with resource utilization.
In the energy and application technology as the second resource of biomass, there is biomass combustion, pyrolysis and gasification equal energy source and the resource technology of high temperature.The burning of biomass can be generated electricity, heat supply, cogeneration; The inflammable gas that the pyrolysis of biomass produces can carry out energy and recycling; The inflammable gas that gasifying biomass produces also can carry out energy and recycling.In the energy and recycling process of biomass combustion, pyrolysis and gasification, can give off solid pollutant and gas pollutant.Compared with application technology as the second resource, biomass anaerobic fermentation is prepared biogas technology, can reduce the discharge of solid and gas pollutant with the high temperature energy of above-mentioned biomass, improves the recycling rate of biomass.Therefore, biomass anaerobic fermentation technology obtains in recent years quick commercialization in developed country and applies, and becomes gradually the mainstream technology of biomass energyization and resource utilization.
The raw material that biomass anaerobic fermentation is prepared biogas can be agricultural crop straw, human and animal excreta, municipal sludge etc.Biomass anaerobic fermentation is prepared the four-stages such as the hydrolysis of biogas experience, acidifying, acetic acid and methanation, and above-mentioned four-stage all requires under anaerobic to complete.The product of biomass anaerobic fermentation has the biogas (volumetric concentration of biogas related components: CH
4: 50-65%, CO
2: 25-45%, H in the time of 20-40 ℃
2o:2-7%, N
2: < 2%, O
2: < 2%, H
2: < 2%., H
2s:20-20000ppm), natural pond liquid and natural pond slag.Biogas can carry out recovery energy as fuel, sends into gas transmission pipeline net work and carry out resource utilization application after also can concentrating; Natural pond liquid can be used as also field of liquid fertilizer; Natural pond slag can further ferment and make SOLID ORGANIC fertilizer.Biomass anaerobic fermentation is prepared the These characteristics of biogas technology, has promoted the large-scale commercial application of this technology.In the world according to the difference of leavening temperature, biomass anaerobic fermentation can be divided into three kinds of normal temperature fermentation (leavening temperature is less than 25 ℃), mesophilic digestion (leavening temperature 35-42 ℃) and thermophilic fermentations (leavening temperature 50-65 ℃); According to the difference of the mass concentration of solid materials in fermentation raw material (solid content), biomass anaerobic fermentation can be divided into wet type fermentation (solid content is less than 13%), half dry type fermentation (solid content 15-20%) and dry type fermentation (solid content is greater than 20%).The system that the large scale business anaerobically fermenting having put into operation is both at home and abroad prepared biogas mostly is mesophilic digestion and thermophilic fermentation.Dry-type anaerobic fermentation, compared with wet type anaerobically fermenting, has volume yield rate height and the few remarkable advantage of natural pond output of fluid.In recent years, strengthen the R&D intensity of biomass dry-type anaerobic fermentation technology both at home and abroad, promoted the commercial applications process of biomass dry-type anaerobic fermentation technology.No matter wet type biomass anaerobic fermentation, or dry type biomass anaerobic fermentation, the factors such as the kind of fermentation raw material, the solid content of raw material, leavening temperature, raw material stirring, pH, bacterial classification are all the principal elements that affects its factor of created gase, also directly affect anaerobic fermentation system reliability of operation and economy.In the time that the raw material type of anaerobically fermenting and solid content remain unchanged, leavening temperature and alr mode become the most important factor that affects anaerobic fermentation system economical operation.In middle gentle high-temperature anaerobic fermentation system, the heat that in anaerobic fermentation process, the organic matter degradation of fermentation raw material produces, is generally not enough to maintain the required temperature of anaerobically fermenting, need to heat fermentation raw material.In order to improve the volume yield rate of anaerobically fermenting, need to stir fermentation raw material, the mass transfer process of forced fermentation raw material, improves biochemical reaction rate.Therefore, fermentation raw material being carried out rationally and effectively stirring and heating, is the important technical that guarantees biomass anaerobic fermentation system stability and economical operation.
The alr mode of common fermentation raw material has mechanical stirring, gas stirring, liquid agitation, gas-liquid two-phase to stir different modes.Fermentation raw material heats required heat, can be from anaerobic fermentation system outside or anaerobic fermentation system inside.In most of commercialization biomass anaerobic fermentation systems, the heat of heating fermentation raw material is generally all from anaerobic fermentation system inside.When biomass anaerobic fermentation system is in when unloading phase, fermentation system does not produce biogas, and the required heat of heating fermentation raw material is from steam boiler or hot water boiler, and the fuel of steam boiler or hot water boiler can be fuel oil, can be also combustion gas or solid fuel.In the time that biomass anaerobic fermentation normally moves, fermentation system can produce a large amount of biogas.The fuel of biogas Chang Zuowei oil-electric engine group carries out recovery energy, and the waste heat of oil-electric engine group is for heating the thermal source of fermentation raw material, and the conventional tubular heat exchanger of type of heating heats fermentation raw material.If when the waste heat of oil-electric engine group can not meet the needs of heating fermentation materials, need steam boiler or hot water boiler to supplement required heat, the biogas that the fuel of steam boiler or hot water boiler often adopts anaerobic fermentation system to produce.In order to simplify the heating system of fermentation raw material, steam boiler or hot water boiler often adopt gas fired-boiler, make anaerobic fermentation system in the time of startup and accidental conditions, and steam boiler or hot water boiler all adopt geseous fuel.In practical engineering application, the fermentation raw material heating system being formed by oil-electric engine group and biomass boiler; Also the fermentation raw material heating system being formed by oil-electric engine group and oil-firing boiler.No matter the heating system of above-mentioned which kind of anaerobic fermentation raw material, the heat of heating raw is all from the combustion processes of fuel.In combustion process of the internal-combustion engine, take fermenting process produce biogas as fuel, the about 1.05-1.10 of excess air ratio; In the combustion processes of steam boiler or hot water boiler, no matter adopt gas, liquid and solid fuel, excess air system is also all greater than 1, this explanation, the combustion processes in oil engine and boiler all can be discharged a large amount of NOx.If can effectively reduce the NOx discharge of steam boiler or hot water boiler, can improve the environment friendly of biomass anaerobic fermentation system heating raw materials process.Therefore, in meeting biomass anaerobic fermentation system heating and stirring requirement, reduce NOx discharge, there is important Practical significance.
Summary of the invention
Technical problem to be solved by this invention is to reduce the NOx discharge of steam boiler or hot water boiler, improves the environment friendly of biomass anaerobic fermentation system heating raw materials process.
For solving technical problem of the prior art, the invention provides a kind of biomass anaerobic fermentation stirring and heating means and system thereof.
On the one hand, provide a kind of biomass anaerobic fermentation to stir and heating means, described method comprises:
Airborne oxygen separation is gone out, and fuel is carried out to oxygen-enriched combusting; The heat heated feed water producing by oxygen-enriched combusting; At least one gas that anaerobic fermentation tank is produced in biogas mixes with heated feed water, and biomass ferment tank is carried out to gas-liquid two-phase stirring.
Described fuel is for spontaneously expecting, described oil fuel carries out oxygen-enriched combusting with isolated oxygen mix after atomization.
Described method also comprises: the biogas that anaerobic fermentation tank is produced carries out membrane sepn and obtains methane fuel and carbon dioxide;
When biomass anaerobic fermentation tank starts, oil fuel and isolated oxygen mix are carried out oxygen-enriched combusting, and heated feed water;
When biomass anaerobic fermentation tank normally moves, will after isolated institute methane fuel and isolated oxygen mix, carry out oxygen-enriched combusting, and heated feed water; Isolated carbon dioxide carries out gas-liquid two-phase stirring to biomass ferment tank after mixing with the feedwater after heating.
The volumetric concentration that the biogas that anaerobic fermentation tank produces obtains methane after membrane sepn is greater than 86%, and the concentration by volume that air is isolated oxygen after membrane sepn is greater than 75%.
On the other hand, provide a kind of biomass anaerobic fermentation to stir and heating system,
A kind of biomass anaerobic fermentation tank stirs and heating system, comprise fermentor tank, heating unit and bubble-liquid two-phase jet device, described bubble-liquid two-phase jet device is arranged in described fermentor tank, described heating unit is for heating to the medium of described fermentor tank, described system also comprises gas separation unit, for airborne oxygen is separated; Described gas separation unit is connected with described heating unit, isolated oxygen by the road with described heating unit in fuel mix carry out oxygen-enriched combusting, the heat producing is supplied with the feedwater in described heating unit;
Described bubble-liquid two-phase jet device receives respectively at least one gas in biogas that produces in feedwater in described heating unit and described fermentor tank, for the medium of described fermentor tank is carried out to bubble-liquid two-phase jet stirring.
Described heating unit comprises: hot water boiler, oil tank and oil-firing burner, described oil tank is connected with the oil-in of described oil-firing burner by oil pump, described gas separation unit isolated oxygen be connected with the inlet mouth of described oil-firing burner by the first blower fan, the burning by described oil-firing burner provides thermal source for described hot water boiler.
Described gas separation unit comprises the first pneumatic plant, the first membrane separation apparatus and oxygen storage tank, and the inlet mouth of described the first membrane separation apparatus is connected with the air outlet of described the first pneumatic plant, and the oxygen separation outlet of described the first membrane separation apparatus is connected with described oxygen storage tank; Described the first pneumatic plant absorbs air and isolates oxygen by described the first membrane separation apparatus, and enters in described oxygen storage tank, and the air outlet of described oxygen storage tank is connected with the inlet mouth of described oil-firing burner by the first blower fan.
Described gas separation unit also comprises the second pneumatic plant, the second membrane separation apparatus and methane storage tank, the inlet mouth of described the second pneumatic plant is connected with the air storage chamber on described fermentor tank top, the air outlet of described the second pneumatic plant is connected with the inlet mouth of described the second membrane separation apparatus, described the second membrane separation apparatus is for isolating methane fuel and carbon dioxide by the biogas of described fermentor tank, and isolated methane fuel is stored in described methane storage tank;
In described heating unit, be also provided with gas burner, described methane storage tank is connected with the inlet mouth of described gas burner respectively with oxygen storage tank, for isolated methane fuel is carried out to oxygen-enriched combusting, for described hot water boiler provides thermal source.In the time that fermentor tank is working properly, can only relies on and methane fuel is carried out to oxygen-enriched combusting can realize the heating to medium in fermentor tank.
In described gas separation unit, be also provided with the carbon dioxide separation of described the second membrane separation apparatus and export the carbon dioxide storage tank being connected, described carbon dioxide storage tank is connected with described bubble-liquid two-phase jet device by the 3rd blower fan, described bubble-liquid two-phase jet device receives respectively the feedwater after carbon dioxide and heating, and the medium in described fermentor tank is carried out to gas-liquid two-phase stirring.By the feedwater after carbonic acid gas and heating is carried out to gas-liquid two-phase stirring to the medium in fermentor tank, realize the quick conduction of heat between medium in fermentor tank.
Described bubble-liquid two-phase jet device comprises: nozzle, nozzle pole, oscillating motor and shift mechanism;
Described nozzle pole is arranged on the inwall of described fermentor tank along the short transverse of described fermentor tank, which is provided with displacement guide groove;
One end of described nozzle is arranged in described displacement guide groove, and and form sliding connection between described nozzle pole, described nozzle is provided with the steam-in being connected with the vapour outlet of described hot water boiler, is provided with near the exit end of described nozzle the gas inlet being connected with the air outlet of described the 3rd blower fan;
Described oscillating motor is connected with described nozzle pole, for driving described nozzle pole to make periodic wobble by certain angle;
Described shift mechanism is connected with described nozzle, periodically mobile up and down for driving described nozzle to do along described displacement guide groove.
Described shift mechanism comprises drive-motor, wireline and wind, described wind and relative being fixedly connected with of described nozzle pole, and described drive-motor is used for driving described wind rotation; Described wirerope-winding is on described wind, and its one end is fixedly connected with described nozzle, drives described wind positive and negative rotation by described drive-motor, realizes moving up and down of described nozzle.
The beneficial effect that technical scheme provided by the invention is brought is:
1) the present invention utilizes membrane separation apparatus to separate air, isolate oxygen and carbon dioxide, wherein isolated oxygen is stored in oxygen storage tank, and isolated carbon dioxide is discharged from, by the fuel of heating unit is carried out to oxygen-enriched combusting, can reduce NOx disposal of pollutants.
2) the present invention further carries out physical sepn to the biogas producing in anaerobic fermentation tank, produces CH
4volumetric concentration exceedes 86% inflammable gas and rich CO
2gas, be respectively used to the fuel of oxygen-enriched combusting and the source of the gas of bubble-liquid two-phase jet, realizing anaerobic fermentation system utilizes self-produced gas that fermentation raw material is stirred simultaneously and heated, and maintain the object of anaerobism atmosphere in fermentor tank, simultaneously, hot water boiler combustion volume thermal load is improved more than 50%, reduce NOx disposal of pollutants more than 85%.
3) the present invention can realize stirring and the heating of the fermentation raw material of different positions in anaerobic fermentation tank by removable gas-liquid dual-phase jet, heat transfer and the mass transfer of fermentation raw material inside are strengthened, can make the volume yield rate of anaerobic fermentation tank increase more than 8%, and there is maintenance, overhaul feature easily;
4) under anaerobic fermentation tank aerogenesis and anaerogenic operating mode, all can realize stirring and the heating of fermentation raw material simultaneously, also can realize independent stirring or the heating of fermentation raw material in anaerobic fermentation tank, reduce the energy consumption of anaerobic fermentation system, improve the economy of anaerobic fermentation system operation.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that the portable bubble-liquid two-phase jet of biomass anaerobic fermentation tank provided by the present invention stirs and heating system schematic diagram.
Fig. 2 is the bubble-liquid two-phase jet apparatus structure schematic diagram in Fig. 1;
Fig. 3 is the nozzle branching rod structure figure in Fig. 2;
Fig. 4 is the nozzle arrangements sectional view in Fig. 2.
In figure:
1-the first pneumatic plant; 2-the first membrane separation apparatus; 3-the second membrane separation apparatus; 4-carbon dioxide storage tank; 5-the 3rd blower fan; 6-the second pneumatic plant; 7-valve; 8-valve; 9-methane storage tank; 10-the second blower fan; 11-oxygen storage tank; 12-the first blower fan; 13-orienting sleeve; 14-nozzle pole, the 141-guide groove that is shifted; 15a-oscillating motor, 15b-drive-motor; 16-nozzle, 161-steam-in, 162-gas inlet; 17-air storage chamber; 18-fermentor tank; 19-gas burner; 20-hot water boiler; 21-oil-firing burner; 22-valve; 23-service pump; 24-oil pump; 25-water tank; 26-oil tank; 27,28-valve; 29-support; 30-wind; 31-wireline.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
The invention provides a kind of biomass anaerobic fermentation tank and stir and heating means, its concrete grammar is as follows:
Airborne oxygen separation is gone out, and fuel is carried out to oxygen-enriched combusting; The heat heated feed water producing by oxygen-enriched combusting; At least one gas that anaerobic fermentation tank 18 is produced in biogas mixes with heated feed water, and biomass ferment tank 18 is carried out to gas-liquid two-phase stirring.
Fuel is wherein for spontaneously expecting, oil fuel isolated oxygen mix after atomization and from air is carried out oxygen-enriched combusting, when biomass anaerobic fermentation tank 18 is in the time starting, fermentor tank 18 air storage chamber 17 above does not produce the biogas deficiency of biogas or generation, oil fuel and isolated oxygen mix are carried out oxygen-enriched combusting and are carried out heated feed water, also can be used in the normal course of operation of anaerobic fermentation tank 18.
Preferred scheme is in the time that biomass anaerobic fermentation tank normally moves again, and the biogas producing in fermentor tank is carried out to membrane sepn, obtains respectively methane fuel and carbon dioxide; To after isolated institute methane fuel and isolated oxygen mix, carry out oxygen-enriched combusting, and heated feed water; After isolated carbon dioxide mixes with the feedwater after heating, biomass ferment tank being carried out to gas-liquid two-phase stirs and heating.
The volumetric concentration that the biogas that the anaerobic fermentation tank here produces obtains methane after membrane sepn is preferably greater than 86%, and the concentration by volume that air is isolated oxygen after membrane sepn is preferably greater than 75%.
As depicted in figs. 1 and 2, the present invention also provides a kind of biomass anaerobic fermentation tank to stir and heating system, comprise fermentor tank 18, heating unit, bubble-liquid two-phase jet device and gas separation unit, bubble-liquid two-phase jet device is arranged in fermentor tank 18, heating unit is for heating to the medium of fermentor tank 18, and gas separation unit is for separating airborne oxygen; Gas separation unit is connected with heating unit, isolated oxygen by the road with heating unit in fuel mix carry out oxygen-enriched combusting, the heat that produces is supplied with the feedwater in heating unit; Bubble-liquid two-phase jet device receives respectively at least one gas in biogas that produces in the feedwater of heating unit and fermentor tank 18, stirs and heating for the medium of fermentor tank 18 being carried out to gas-liquid two-phase.
Heating unit wherein comprises: hot water boiler 20, oil tank 26 and oil-firing burner 21, oil tank 26 is connected with the oil-in of oil-firing burner 21 by oil pump 24, gas separation unit isolated oxygen pass through the first blower fan 12 and be connected with the inlet mouth of oil-firing burner 21; Oil-firing burner 21 is for providing thermal source to hot water boiler 20.
Gas separation unit wherein comprises the first pneumatic plant 1, the first membrane separation apparatus 2 and oxygen storage tank 11, the inlet mouth of the first membrane separation apparatus 2 is connected with the air outlet of the first pneumatic plant 1, the oxygen separation outlet of the first membrane separation apparatus 2 is connected with oxygen storage tank 11, oxygen storage tank 11 is connected with the inlet mouth of oil-firing burner 21 by the first blower fan 12, is mainly used in the startup of fermentor tank 18.
Gas separation unit also comprises the second pneumatic plant 6, the second membrane separation apparatus 3 and methane storage tank 9, the inlet mouth of the second pneumatic plant 6 is connected with the air storage chamber 17 on fermentor tank 18 tops, the air outlet of the second pneumatic plant 6 is connected with the inlet mouth of the second membrane separation apparatus 3, the second membrane separation apparatus 3 is for isolating methane fuel and carbon dioxide by the biogas of fermentor tank 18, and isolated methane fuel is stored in methane storage tank 9; In heating unit, be also provided with gas burner 19, methane storage tank 9 is connected with the inlet mouth of gas burner 19 respectively with oxygen storage tank 11, for isolated methane fuel is carried out to oxygen-enriched combusting, for hot water boiler 20 provides thermal source; In gas separation unit, be also provided with the carbon dioxide separation of the second membrane separation apparatus 3 and export the carbon dioxide storage tank 4 being connected simultaneously, carbon dioxide storage tank 4 is connected with bubble-liquid two-phase jet device by the 3rd blower fan 5, bubble-liquid two-phase jet device receives respectively the feedwater after carbon dioxide and heating, medium in fermentor tank 18 is carried out to gas-liquid two-phase stirring, be mainly used under the normal operating conditions after fermentor tank 18 starts.
Bubble-liquid two-phase jet device wherein as shown in Figure 2, comprise: nozzle 16, nozzle pole 14, oscillating motor 15a and shift mechanism, nozzle pole 14 is arranged at along the short transverse of fermentor tank 18 on the inwall of fermentor tank 18, nozzle pole 14 is provided with displacement guide groove 141, as shown in Figure 3, one end of nozzle 16 be arranged at displacement guide groove 141 in, and and nozzle pole 14 between form sliding connection; Oscillating motor 15a is connected with nozzle pole 14, be used for driving nozzle pole 14 to make periodic wobble by certain angle, the upper end of nozzle pole arranges an orienting sleeve 13, and orienting sleeve 13 is relative with nozzle pole 14 to be rotatably connected, orienting sleeve 13 and relative being fixedly connected with of fermentor tank 18 inwalls; Shift mechanism is connected with nozzle 16, periodically mobile up and down for driving nozzle 16 to do along displacement guide groove 141.
As shown in Figure 4, nozzle 16 is provided with the steam-in 161 being connected with the vapour outlet of hot water boiler 20 to nozzle 16 structures, is provided with near the exit end of nozzle 16 gas inlet 162 being connected with the air outlet of the 3rd blower fan 5.
Shift mechanism wherein comprises drive-motor 15b, wireline 31 and wind 30, wind 30 is fixedly connected with by support 29 is relative with nozzle pole 14, drive-motor 15b is used for driving wind 30 to rotate, wireline 31 is wound on wind 30, one end of wireline 31 is fixedly connected with nozzle 16, drive wind 30 positive and negative rotations by drive-motor 15b, realize moving up and down of nozzle 16.Certain shift mechanism here can be also leading screw drives structure or other structures.
Embodiment 1
Accompanying drawing 1 is the system schematic of embodiment 1.
In embodiment 1, anaerobic fermentation system normally moves, the biogas of anaerobic fermentation tank 18 interior generations is stored in the air storage chamber 17 that is positioned at fermentor tank top, biogas through valve 7(now valve 8 close) enter pneumatic plant 6 and compress, biogas after compression is sent into the second membrane separation apparatus 3 and is carried out physical sepn, and biogas is separated into CH
4volumetric concentration exceedes 86% inflammable gas and rich CO
2gas.Containing CH
4volumetric concentration exceedes 86% combustible gas storage in methane storage tank 9, rich CO
2gas storage is in carbon dioxide storage tank 4.Air is separated into O through the first pneumatic plant 1 and the first membrane separation apparatus 2
2concentration by volume exceedes 75% oxygen enrichment and rich N
2gas, oxygen enrichment is stored in oxygen storage tank 11, rich N
2gas enters atmosphere.Oxygen enrichment in oxygen storage tank 11 enters gas burner 19(valve 28 through the first blower fan 12 and opens, and valve 27 is closed) with the CH of the methane storage tank 9 carried through the second blower fan 10
4volumetric concentration exceedes 86% inflammable gas mixing, carries out oxygen-enriched combusting.In hot water boiler 20, the heat heated feed water that oxygen-enriched combusting produces.Sending into hot water boiler 20(valve 22 from the feedwater in water tank 25 by service pump 23 closes), send into water tank 25 through chemically treated boiler replenishing water.The hot water that hot water boiler 20 produces is sent into nozzle 16, and the acceleration of hot water in nozzle 16 forms local decompression, by the rich CO from carbon dioxide storage tank 4
2the rich CO being sent into by the 3rd blower fan 5
2gas sucks, form bubble-liquid two-phase jet, the nozzle 16 of bubble-liquid two-phase jet is arranged on along fermentor tank 18 short transverses and is installed in the displacement guide groove 141 of nozzle pole 14, drive wind 30 to rotate by drive-motor 15b, and driving nozzle 16 to move freely along fermentor tank short transverse by wireline 31, corresponding position-limit mechanism limits the vertical miles of relative movement of nozzle 16; Meanwhile, the dual-phase jet that nozzle 16 exports and fermentor tank 18 inwall shapes have a certain degree, and drive nozzle pole 14 to press certain angle swing by oscillating motor 15b, thereby realize the conversion of nozzle spray angle.The present invention can arrange multiple bubble-liquid two-phase jet nozzles 16 along fermentor tank 18 inwalls, stirring and heating that can forced fermentation raw material, control velocity of discharge and the top hole pressure of bubble-liquid two-phase jet, can change the rigidity of bubble-liquid two-phase jet, improve stirring intensity and the heating rate of fermentation raw material.
Biogas and air that fermentation system is produced carry out respectively physical sepn, obtain high CH
4the inflammable gas of concentration and oxygen enrichment, the two carries out oxygen-enriched combusting in hot water boiler, reduces the discharge of NOx, utilizes rich CO simultaneously
2gas is as the source of the gas of bubble-liquid two-phase jet, the hot water producing with hot water boiler 20 forms bubble-liquid two-phase jet, bubble-liquid two-phase jet is designed to movably, strengthen the heat and mass transfer of fermentation raw material inside, improve stirring intensity and heating rate to fermentation raw material, can make the volume yield rate of fermentor tank improve more than 8%.Utilize the self-produced biogas of fermentation system as fuel and jet source of the gas, be conducive to keep the anaerobism atmosphere in fermentor tank, energy and the recycling rate of biogas are improved, and realized the object that significantly reduces NOx discharge, improve economy and the environment friendly of biomass anaerobic fermentation system.
Accompanying drawing 1 is also the system schematic of embodiment 2.
In embodiment 2, if anaerobic fermentation system in unloading phase, in fermentor tank 18, do not have biogas to produce, the gas in air storage chamber 17 through valve 8(now valve 7 close) enter carbon dioxide storage tank 4.Air is separated into O through the first pneumatic plant 1 and the first membrane separation apparatus 2
2concentration by volume exceedes 75% oxygen enrichment and rich N
2gas, oxygen enrichment is stored in oxygen storage tank 11, rich N
2gas enters atmosphere.Oxygen enrichment in oxygen storage tank 11 enters oil-firing burner 21(valve 27 through the first blower fan 12 and opens, and valve 28 is closed), enter oil-firing burner 21 and carry out atomization through oil pump 24 from the fuel oil of oil tank 26, complete oxygen-enriched combusting.In hot water boiler 20, the heat heated feed water that oxygen-enriched combusting produces, sending into hot water boiler 20(valve 22 from the feedwater of water tank 25 by service pump 23 closes), feed water tank 25 through chemically treated boiler replenishing water, the hot water that hot water boiler 20 produces is sent into nozzle 16, hot water in nozzle 16, accelerate form local decompression, by the gas in gas-holder 4 through the 3rd blower fan 5 inlet nozzles 16, form bubble-liquid two-phase jet, the operation conditions of bubble-liquid two-phase jet subsystem is identical with embodiment 1.The unloading phase of fermentor tank, when the present invention meets fermentation raw material stirring and adds heat request, promoted the formation of the interior anaerobism atmosphere of air storage chamber 17.In addition, the oxygen-enriched combusting of oil also can significantly reduce the discharge of NOx.
In sum, embodiment 1 and embodiment 2 illustrate the present invention can fermentor tank normal operating phase or unloading phase, all can realize stirring and the heating of fermentation raw material, and be conducive to formation and the maintenance of anaerobism atmosphere in fermentor tank, and can significantly reduce the discharge of NOx, there is significant economic benefit and social benefit.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. biomass anaerobic fermentation tank stirs and heating means, it is characterized in that, described method comprises:
Airborne oxygen separation is gone out, and fuel is carried out to oxygen-enriched combusting; The heat heated feed water producing by oxygen-enriched combusting; At least one gas that anaerobic fermentation tank is produced in biogas mixes with heated feed water, and biomass ferment tank is carried out to gas-liquid two-phase stirring; Wherein said fuel is oil fuel, and described oil fuel carries out oxygen-enriched combusting with isolated oxygen mix after atomization; Described method further comprises: the biogas that anaerobic fermentation tank is produced carries out membrane sepn and obtains methane fuel and carbon dioxide;
When biomass anaerobic fermentation tank starts, oil fuel and isolated oxygen mix are carried out oxygen-enriched combusting, and heated feed water;
When biomass anaerobic fermentation tank normally moves, will after isolated institute methane fuel and isolated oxygen mix, carry out oxygen-enriched combusting, and heated feed water; Isolated carbon dioxide carries out gas-liquid two-phase stirring to biomass ferment tank after mixing with the feedwater after heating.
2. biomass anaerobic fermentation tank according to claim 1 stirs and heating means, it is characterized in that:
The volumetric concentration that the biogas that anaerobic fermentation tank produces obtains methane after membrane sepn is greater than 86%, and the concentration by volume that air is isolated oxygen after membrane sepn is greater than 75%.
3. a biomass anaerobic fermentation tank stirs and heating system, comprise fermentor tank (18), heating unit and bubble-liquid two-phase jet device, described bubble-liquid two-phase jet device is arranged in described fermentor tank, and described heating unit, for heating to the medium of described fermentor tank, is characterized in that:
Described system also comprises gas separation unit, for airborne oxygen is separated; Described gas separation unit is connected with described heating unit, isolated oxygen by the road with described heating unit in fuel mix carry out oxygen-enriched combusting, the heat producing is supplied with the feedwater in described heating unit;
Described bubble-liquid two-phase jet device receives respectively feedwater and middle at least one gas in biogas that produces of described fermentor tank (18) in described heating unit, for the medium of described fermentor tank (18) is carried out to bubble-liquid two-phase jet stirring;
Described heating unit comprises: hot water boiler (20), oil tank (26) and oil-firing burner (21), described oil tank (26) is connected with the oil-in of described oil-firing burner (21) by oil pump (24), described gas separation unit isolated oxygen be connected with the inlet mouth of described oil-firing burner (21) by the first blower fan (12), be that described hot water boiler (20) provides thermal source by the burning of described oil-firing burner (21);
Described gas separation unit comprises the first pneumatic plant (1), the first membrane separation apparatus (2) and oxygen storage tank (11), the inlet mouth of described the first membrane separation apparatus (2) is connected with the air outlet of described the first pneumatic plant (1), and the oxygen separation outlet of described the first membrane separation apparatus (2) is connected with described oxygen storage tank (11); Described the first pneumatic plant (1) absorbs air and isolates oxygen by described the first membrane separation apparatus (2), and enter in described oxygen storage tank (11), the air outlet of described oxygen storage tank (11) is connected with the inlet mouth of described oil-firing burner (21) by the first blower fan (12).
4. biomass anaerobic fermentation tank according to claim 3 stirs and heating system, it is characterized in that:
Described gas separation unit also comprises the second pneumatic plant (6), the second membrane separation apparatus (3) and methane storage tank (9), the inlet mouth of described the second pneumatic plant (6) is connected with the air storage chamber (17) on described fermentor tank (18) top, the air outlet of described the second pneumatic plant (6) is connected with the inlet mouth of described the second membrane separation apparatus (3), described the second membrane separation apparatus (3) is for isolating methane fuel and carbon dioxide by the biogas of described fermentor tank (18), and isolated methane fuel is stored in described methane storage tank (9);
In described heating unit, be also provided with gas burner (19), described methane storage tank (9) is connected with the inlet mouth of described gas burner (19) respectively with oxygen storage tank (11), for isolated methane fuel is carried out to oxygen-enriched combusting, for described hot water boiler (20) provides thermal source.
5. biomass anaerobic fermentation tank according to claim 4 stirs and heating system, it is characterized in that:
In described gas separation unit, be also provided with the carbon dioxide separation of described the second membrane separation apparatus (3) and export the carbon dioxide storage tank (4) being connected, described carbon dioxide storage tank (4) is connected with described bubble-liquid two-phase jet device by the 3rd blower fan (5), described bubble-liquid two-phase jet device receives respectively the feedwater after carbon dioxide and heating, and the medium in described fermentor tank (18) is carried out to gas-liquid two-phase stirring.
6. biomass anaerobic fermentation tank according to claim 5 stirs and heating system, it is characterized in that:
Described bubble-liquid two-phase jet device comprises: nozzle (16), nozzle pole (14), oscillating motor (15a) and shift mechanism;
Described nozzle pole (14) is arranged on the inwall of described fermentor tank (18) along the short transverse of described fermentor tank (18), which is provided with displacement guide groove (141);
One end of described nozzle (16) is arranged in described displacement guide groove (141), and and form sliding connection between described nozzle pole (14), described nozzle (16) is provided with the steam-in (161) being connected with the vapour outlet of described hot water boiler (20), is provided with near the exit end of described nozzle (16) gas inlet (162) being connected with the air outlet of described the 3rd blower fan (5);
Described oscillating motor (15a) is connected with described nozzle pole (14), for driving described nozzle pole (14) to make periodic wobble by certain angle;
Described shift mechanism is connected with described nozzle (16), periodically mobile up and down for driving described nozzle (16) to do along described displacement guide groove (141).
7. biomass anaerobic fermentation tank according to claim 6 stirs and heating system, it is characterized in that:
Described shift mechanism comprises drive-motor (15b), wireline (31) and wind (30), described wind (30) and relative being fixedly connected with of described nozzle pole (14), described drive-motor (15b) is for driving described wind (30) rotation; It is upper that described wireline (31) is wound in described wind (30), and its one end is fixedly connected with described nozzle (16), drives described wind (30) positive and negative rotation by described drive-motor (15b), realizes moving up and down of described nozzle (16).
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| CN105731638A (en) * | 2016-02-18 | 2016-07-06 | 江苏理文造纸有限公司 | Method for conducting aeration treatment on sewage |
| CN106247377A (en) * | 2016-08-30 | 2016-12-21 | 王政 | Combustion-supporting system based on film oxygen enriching |
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| FR2924038B1 (en) * | 2007-11-28 | 2011-05-06 | Ile Dlmr Soc Civ | WASTE TREATMENT PROCESS ASSOCIATED WITH METHANIZATION TREATMENT PHASE AND THERMOPHILIC AEROBIC TREATMENT PHASE |
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