EP2467661B1 - Vorrichtung zur verarbeitung von nasser biomasse mittels brennen - Google Patents

Vorrichtung zur verarbeitung von nasser biomasse mittels brennen Download PDF

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Publication number
EP2467661B1
EP2467661B1 EP10741999.6A EP10741999A EP2467661B1 EP 2467661 B1 EP2467661 B1 EP 2467661B1 EP 10741999 A EP10741999 A EP 10741999A EP 2467661 B1 EP2467661 B1 EP 2467661B1
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EP
European Patent Office
Prior art keywords
tank
oil
biomass
frying
oil bath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10741999.6A
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English (en)
French (fr)
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EP2467661A1 (de
Inventor
Didier Lecomte
Anwar Hamasaiid
Jean-Claude Poussin
Bernard Auduc
Bruno Ladevie
Med Hedi Romdhana
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Ecole Nationale Superieure Des Techniques Industrielles Et Des Mines D'Albi-Carmaux LBI-CARMAUX
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Ecole Nationale Superieure Des Techniques Industrielles Et Des Mines D'Albi-Carmaux LBI-CARMAUX
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Publication of EP2467661A1 publication Critical patent/EP2467661A1/de
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Publication of EP2467661B1 publication Critical patent/EP2467661B1/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/005—Drying solid materials or objects by processes not involving the application of heat by dipping them into or mixing them with a chemical liquid, e.g. organic; chemical, e.g. organic, dewatering aids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/041—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying flowable materials, e.g. suspensions, bulk goods, in a continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00

Definitions

  • the invention is in the field of moist biomass treatment by frying technology. It relates more particularly to a device for such treatment.
  • biomass any material of organic type containing a high water content, especially at least 50% by weight, regardless of its origin.
  • the biomass to which the invention applies may, for example, be a sludge, originating, for example, from purification plants, a waste from the paper industry, slaughterhouses, agriculture, etc., or a waste material.
  • vegetable origin a food, a biological waste or a sedimentary material such as lignite or peat.
  • a preferred, although not limiting, field of application of the invention is that of the manufacture of solid fuel from biomass, by dehydration of the latter by frying.
  • the invention also applies in a manner similar to frying food or hygienization, for example medical biological waste, or any other type of treatment to obtain, after frying, a final material that is particularly solid , storable and transportable.
  • the document WO 2009/038252 which discloses a device comprising a dehydration unit containing an oil bath heated by a burner, into which the material to be fried is introduced, and a cooling unit of the fuel obtained.
  • a control of the residence time of the biomass in the oil is carried out by means of a worm or a conveyor belt driving the material to be fried inside a cylindrical drum filled with oil.
  • Such a device has the particular disadvantage of requiring a significant energy input to achieve the frying to form the fuel.
  • the document FR714063 which discloses a frying wet biomass processing device having the features of the preamble of claim 1.
  • the present invention aims to overcome the disadvantages of existing wet biomass frying treatment devices, particularly those described above, by proposing a device that requires a low energy input for its operation, and therefore has a cost of reduced operation, while allowing to obtain a solid material, separated from the frying oil, water content perfectly controlled.
  • a frying wet biomass treatment device in particular for forming a solid fuel from this biomass, comprises a first frying tank, containing a first oil bath, means capable of maintaining the oil of this first bath at a so-called frying temperature for frying the biomass, that is to say at a significantly higher temperature, for example at least 5 ° C, at the boiling temperature of the water, and means for introducing the biomass into this first tank.
  • This device comprises a second tank, said separation, forming gravity settling separation means of the solid material fried in the first oil bath and oil, the second tank containing a second lower temperature oil bath at frying temperature.
  • the first tank and the second tank are communicating volumes, so that the respective oil bath they contain are naturally in hydraulic communication one with the other.
  • the device according to the invention further comprises means for transferring the solid fried material, obtained from the biomass, from the first tank to the second tank, more specifically from the first oil bath in the second oil bath. and means for discharging the solid fried material, which has been separated from the oil by gravity settling, out of the second tank.
  • the means capable of maintaining the oil of the first bath at a frying temperature of the biomass, defined and controlled comprise means for sampling oil in the second tank, means for heating the oil thus taken and means for injection of the oil thus heated in the first tank.
  • oil includes any fluid fatty substance, and more generally any fluid having the characteristics of being immiscible with water, stable at a temperature above the boiling point of water, and of high power. heat. Particularly preferred in the context of the invention, for an implementation for the manufacture of solid fuel from wet waste, oils and fats obtained from plant and animal food waste, fats or waste wastewater treatment plants that have been previously heated and rendered liquid.
  • frying of the biomass itself is carried out in the first tank, in which the oil bath is at a temperature sufficient to ensure this frying. It produces, in a conventional manner in itself, a dehydration of the biomass by frying. This dehydration causes the release of steam in the first tank, above the oil bath.
  • the solid fuel thus obtained has, in a manner known per se, a high calorific value.
  • the oil bath of the first tank occupies about a quarter of the height of the latter.
  • the fried solid material and the bath oil are separated. This separation is facilitated by the lower temperature of the oil in the second bath, which allows stopping the boiling of the water emerging from the biomass.
  • the second oil bath there is a transfer of the heat stored in the solid material fried to the oil, which is notably enabled by the relatively long residence time of the solid fried material in the second oil bath where the separation by gravitational settling occurs, which is known to involve, by nature, a residence time of the solid in the fluid of a certain duration, in any case sufficient to ensure this heat transfer.
  • the first and second oil bath being in hydraulic communication with each other, the respective temperatures of these baths remain close.
  • the oil of the second bath being used to replenish the oil bath of the first tank, after heating, and therefore already having a relatively high temperature, the external energy input to provide to bring it to a temperature adequate to fry the biomass before injecting it into the first tank is low.
  • the recovery of the heat of the fried material occurring in the oil bath of the second tank thus advantageously reduces the energy consumption required for frying.
  • the residence time of the fried material in the second oil bath is also advantageously partly controlled by the speed of operation of the means for discharging the solid material. fried out of the tank.
  • the frying and separation tanks operating in communicating vessels, the loss of the oil taken from the second tank is compensated by a supply of oil occurring at the same time spontaneously from the first tank.
  • the volumes of oil in each of the tanks thus remain substantially constant.
  • the invention also advantageously provides means for maintaining the overall volume of oil contained in the two tanks at a substantially constant value throughout the operation of the device.
  • the oil taken from the second bath to be reinjected, after heating, in the first bath, is further clarified in the second bath, that is to say largely free of solid particles, before its circulation in the heating circuit.
  • the means for heating the oil taken from the second tank comprise means for extracting the water vapor released in the first tank during frying, and means for heat exchange between the oil taken from the second tank and the water vapor taken from the first tank.
  • the frying tank preferably comprises, in an upper part upstream of a steam extraction opening, demisters capable of removing oil residues from the water vapor escaping above the first oil bath when frying.
  • the device further comprises means for mechanically compressing the water vapor released during frying, upstream of the heat exchange means between the vapor thus compressed and the oil. driven in circulation of the second tank to the first tank.
  • the device according to the invention therefore advantageously has a relatively low energy requirement. After an initial heating of the oil in the first oil bath so as to give it a suitable temperature for frying, this device requires, in order to maintain its operation, a very small external energy input, realized in particular by means of a heating element disposed on the oil circulation circuit between the second tank and the first tank, preferably at the level of the heat exchange means with the steam. At the outlet of the device according to the invention, a fried material separated from the oil is obtained, this with a limited energy requirement, much lower than that of the devices of the prior art.
  • the operation of the device according to the invention in particular the circulation of oil between the two baths, is advantageously implemented continuously, allowing maximum energy efficiency.
  • the means for injecting biomass into the first tank, the means for transferring the fried material into the second tank, and the means for discharging this material out of the latter are also advantageously able to be operated continuously.
  • the device according to the invention for the manufacture of a solid fuel, it achieves a global energy balance quite advantageous, since it is possible to manufacture, by means involving a low consumption of energy, a solid fuel with a high calorific value.
  • the device according to the invention makes it possible to obtain a ratio between the energy consumed and the energy theoretically necessary to manufacture the fuel, linked to the latent heat of vaporization of the water contained in the biomass, which can be as low as 0 , 4, whereas in the industrial drying processes proposed by the prior art, this ratio is generally between 1.25 and 2.5.
  • the device further comprises means for controlling the residence time of the biomass in the first oil bath, allowing the control of the final water content of the fried material, and its rate of impregnation oil.
  • control means comprise a rotating vane wheel arranged in the first oil bath and able to move the biomass from an introduction zone of said biomass into the first vessel to an outlet window to the second vessel, which is preferably formed in a bottom wall of the first vessel.
  • the wheel preferably forms, between rotary blades and a perforated upper frame that it comprises, receiving and transport compartments of biomass, substantially identical shapes and reduced volumes.
  • the means for controlling the residence time of the biomass in the oil bath comprise at least one, preferably a plurality, of blades which are secured by an internal lateral edge of a central shaft articulated in rotation on itself and disposed in the first vessel substantially perpendicular to a lower wall thereof. These blades extend, from the bottom wall, into an internal volume for receiving the oil bath from the tank, and they substantially reach, by an opposite outer lateral edge, the peripheral wall of the tank also delimiting this internal volume.
  • the device according to the invention also comprises means for controlling the rotation of this central shaft.
  • the device in order to achieve all the better this objective, is preferably dimensioned so as to ensure a significant decrease in the hydraulic drive speed of the fried material and oil from the first bath on their arrival in the second bath, so that the separation by settling gravity in the second bath is improved.
  • the ratio between the volume of the second bath and the volume of the first bath is between 1.5 and 4, and preferably about 2.
  • the second tank is placed under the first tank, the pipe connects a lower wall of the first tank and an upper portion of the second tank, and the means for discharging the fried material.
  • solid out of the second vessel operate at an opposite bottom portion of the second vessel.
  • the conduit opens into an upper part of the second tank and extends inside the latter by a dip tube reaching an opposite lower part, preferably close to an opening for discharging solid material fried out of the second tank.
  • this dip tube is provided with fins inclined towards the lower part of the second tank, so as to prevent the solid material to go up towards the upper part of the tank, thus advantageously favoring the settling.
  • the device according to the invention is advantageously configured and operated so as to obtain an adequate temperature of the oil in the second tank, that is to say a temperature sufficiently low to stop the boiling of the water biomass from the first tank and thus promote the settling phenomenon, and at the same time high enough to ensure the lowest possible external energy consumption to maintain the operation of the device ..
  • the second tank also has a high height and is substantially completely filled with oil, which also promotes obtaining a suitable temperature difference between the oil located in the upper part of the tank, which is at a temperature substantially equal to that of the first oil bath contained in the first tank, and the oil located in its lower part, at the discharge opening of the solid material.
  • the device according to the invention is preferably configured and implemented so as to ensure a temperature difference of the oil between the lower part and the upper part of the second tank which is between 2 and 5 ° C.
  • the difference in pressure between the lower part of the second tank, where it is slightly higher, and its upper part, where it is lower, furthermore makes it possible to stop the boiling when the fried material reaches this lower part. .
  • the device further preferably comprises means for placing under reduced pressure inside the first tank, for example so as to obtain a pressure of about 0.5 bar therein.
  • These means for placing under reduced pressure are in particular advantageously constituted by the mechanical vapor compressor which is provided according to the invention in the circuit for recovering the energy of the water vapor released during frying.
  • the device advantageously comprises means capable of sealing the low-pressure device, in particular at the level of the means for introducing the biomass into the first tank and means for evacuating the material. fried out of the second tank.
  • sealing control means may for example be in the form of locks associated with feeding systems and / or screw extraction.
  • the circulation of oil and the circulation of the water vapor takes place in very distinct circuits.
  • the device comprises means for maintaining a substantially constant oil level in the first tank, preferably at about 25% of the internal volume of the tank, by introducing oil. cold in the second tank.
  • This introduction of cold oil is preferably slaved to an oil level indicator disposed in the first tank, and is preferably performed in a lower portion of the second tank, preferably near the outlet port. fried material, so as to help stop the boiling.
  • the means for introducing the biomass into the first vessel comprise an extrusion die disposed through a wall of this first vessel and having cutting zones on a rear face. opposed to the first oil bath, as well as feed means for this biomass die.
  • a device for treating moist biomass by frying according to the invention is represented on the figure 1 , in its normal position of use.
  • This figure in dotted lines, for the sake of clarity of explanation, is represented in the elements inside the tanks forming part of the constitution of this device.
  • This device consists essentially of elements formed of metallic material.
  • a first tank said frying 1, which preferably has a substantially cylindrical shape, and an internal volume is delimited in its bottom by a lower wall 101, and laterally by a peripheral wall 102.
  • a lid 103 At an upper end opposite to the lower wall 101, the vessel is closed by a lid 103, which is secured to it by attachment, and which preferably has a conical shape.
  • An opening 104 is pierced in this cover, preferably substantially at its center, at the top of the cone.
  • the tank 1 contains in its bottom an oil bath 108, which can for example reach a height between one quarter and one third of the height of the tank.
  • the upper level of this oil bath is designated 107 in the figure.
  • the tank 1 comprises means for controlling the residence time of the biomass in the oil. These means comprise a rotating vane wheel system disposed in the bottom of the tank 1, in the oil bath 108. This system will be described in more detail with reference to FIG. figure 2 further in the description.
  • the tank 1 is supplied with biomass by introduction means which comprise, for example, in the embodiment shown in the figure, a feed hopper 111 connected to means 112 for thrusting the biomass through a spinneret. extrusion 113 disposed in an opening provided for this purpose in the peripheral wall 102 of the vessel 1, preferably at the bottom of the latter. All means of thrusting the biomass in the tank 1 conventional in themselves are within the scope of the invention.
  • introduction of biomass may also, for example, alternatively be effected by an opening in the bottom of the vessel 1, through the bottom wall 101.
  • the tank 1 is further provided in its lower wall 101 with a window 105 which preferably defines an angular sector of the wall.
  • the window 105 is slightly peripherally offset in the vessel relative to the biomass introduction opening, illustrated by reference numeral 106 in the figure, at an angle of about 30 to 90 degrees.
  • a central rotary shaft 122 is disposed in the center of the vessel 1, so as to extend from the bottom of the vessel substantially perpendicularly to the bottom wall 101.
  • the vessel 1 is associated with controlled drive means of the shaft in rotation on itself, an embodiment of which will be described in more detail in the present description.
  • At least one blade 121 is fixed on the shaft 122, by a so-called internal lateral edge 141, so as to be integral in rotation.
  • This blade 121 is disposed in the tank so as to extend, above the lower wall 101, substantially perpendicularly to this wall, towards the top of the tank, and so that it comes substantially, by a opposite outer side edge 142, substantially against the peripheral wall 102 of the vessel.
  • the blade 121 is able to move inside the tank, driven by the rotary shaft 122 which it is integral, without exerting friction against the one hand the peripheral wall 102 and on the other hand the lower wall 101 of the tank, and while being sufficiently close to these respective walls so that there is no gap between them that is large enough to let the biomass circulate.
  • the shaft 122 has not been shown, but is illustrated by its receiving cavity 143 formed between the blades in the center of the bottom of the tank.
  • the device comprises a plurality of blades 121.
  • these blades are eight in number, but such a number is in no way limiting of the invention.
  • These blades 121 are arranged at regular angular intervals from one another, and they define between them section compartments of substantially triangular shape 144.
  • the opening 106 for introducing the biomass into the vessel 1 is disposed below the upper level of the compartments 144.
  • a wire frame which is not shown in the figures, is preferably disposed just above the blades 121, so as to delimit the compartments 144 in their upper part, and maintain the biomass in these compartments in the bottom of the tank 1, immersed in the oil bath 108.
  • An indicator of the oil level which is not shown in the figures, is disposed in the tank 1.
  • This indicator is conventional in itself, and can take any form known to those skilled in the art.
  • Deesiculators which have not been shown in the figures for the sake of clarity, are arranged in the vessel 1, in an upper part of the latter. These strippers can take any form known to those skilled in the art, for example knits or metal mattresses. They make it possible to eliminate the oil residues from the water vapor forming during the frying in the tank 1 and going towards the top of the latter, to escape through the opening 104.
  • the device comprises, under the vessel 1, means 3 for transferring the biomass to a second tank 2, called separator, disposed under the first tank 1.
  • These means are in the form of a conduit 31, preferably substantially rectilinear, connecting the window 105 of the first tank 1 to the second tank 2.
  • the duct 31 may be associated with means for cooling the oil circulating in its interior, for example in the form of a heat exchanger schematically illustrated in the figure and designated by the reference 32.
  • the separation vessel, or separator 2 preferably has a substantially cylindrical shape of large diameter. It is delimited at an upper end by an upper wall 201 and at a lower end opposite by a bottom wall in the form of a funnel 202 delimiting in its inside a substantially conical contour volume 203 in the bottom of the separator.
  • the separator 2 is shown in more detail on the figure 3 .
  • the duct 31 is extended, through the upper wall 201, by a dip tube 204 which extends substantially vertically in the separator, until reaching the conical lower volume 203 by an open lower end 205.
  • the dip tube 204 On the outer peripheral surface of the dip tube 204 are fixed fins 206, which have for example a substantially triangular flat shape flaring away from the tube 204 and inclined, from their zone of attachment to the latter, towards the lower volume 203 of the separator, at an angle which may be for example, as illustrated in the figure, approximately equal to 45 degrees. These fins are preferably dimensioned so as to extend substantially to a peripheral wall 207 delimiting the separator 2.
  • the separator comprises three rows each comprising four fins 206, arranged in addition to such that the fins of a first row are offset angularly with respect to the fins of a second row, and so on, so as to occupy together ultimately the entire circular surface of the separator. These fins advantageously prevent any solid material contained in the bottom of the separator back to its upper part.
  • the separator 2 contains an oil bath 211, which preferably fills substantially all of its internal volume, and which communicates with the first oil bath 108.
  • a reservoir 51 containing cold oil is connected to a pipe 52 which opens, at an opposite end 53, into the lower volume 203 of the separator.
  • the pipe 52 is associated, between the tank 51 and the separator 2, with a valve 54.
  • This valve is preferably automatically controlled in opening and closing, by conventional means in themselves, depending on the information reported by the level indicator disposed in the vessel 1.
  • This oil circulation circuit is represented in a simplified manner on the figure 1 , and schematically more detailed on the figure 4 .
  • the first pipe 401 is associated with a pump 405 ensuring the circulation of oil in its interior.
  • This pump is preferably chosen at a variable rate.
  • the second pipe 404 opens at a first end 406 in a lower part of a buffer tank filled with oil 407. From this first end 406, beyond the zone of intersection with the first duct 401, this second duct 404 passes through heating means of the oil circulating in its interior, for example in the form of a heat exchanger 408, before coming out, by a second end 409 opposite the first end 406 in an upper part of the buffer tank 407.
  • the circulation of oil in the second pipe 404 is provided by a pump 410, conventional in itself, and which is preferably chosen to have a high flow rate.
  • the heat exchanger 408 is preferably associated with a heating element 408 ', which constitutes an additional source of energy for heating the oil circulating in the second pipe 404.
  • This heating element can be of any type, being understood that it is preferred in the context of the invention the implementation of inexpensive means of energy supply. For example, it will be preferred to supply this heating element with solar energy sources.
  • Means 411 for preheating the oil flowing in the second pipe 404 in order to initially start the device may also be included in the device according to the invention.
  • a third pipe 412 connects, by a first end 413, an upper end of the buffer tank 407, to the tank 1 in which it opens by an opposite second end 414.
  • a flow meter 415 is disposed on the third pipe 412.
  • the direction of movement of the oil in this double circuit is indicated by the arrows corresponding to the following references on the figure 4 .
  • the oil extracted from the separator 2 is fed in the direction 416 through the first pipe 401 to the second pipe 404 at a preferably slow rate. It flows in the latter in the direction 417, that is to say from the bottom of the buffer tank 407, through the heat exchanger 408 associated with the heating element 408 ', to an upper part of the buffer tank 407. Its circulation speed in this pipe 404 is preferably fast, so as to promote heat exchange at the exchanger 408.
  • the oil finally circulates, preferably at low speed, in direction 418, from the upper end of the buffer tank 407 to the frying tank 1.
  • the third pipe 412 preferably opens into the tank 1 flush with the inner surface of the peripheral wall 102 of the latter, so that the oil injected into the tank through this pipe falls there by forming a film on the inner surface of this peripheral wall, and therefore does not disturb the surface of the oil bath 108 by creating eddies.
  • a tube 420 is fixed, by a first end 421, on the opening 104 formed at the top of the tank 1, above the mistletters.
  • This tube is intended to bring the water vapor released during the frying of the biomass in the tank 1, to a mechanical steam compressor 422, for example a lobe compressor, which compresses it, then up to heat exchanger 408 where it can be used to transfer its energy to the oil flowing in the line 404.
  • the heating element 408 ' is preferably a liquid water collection tank from the compressor 422 through the pipe 420, and provided with a heating resistor capable of heating the water to provide additional energy for the heating of the oil.
  • This tank can be equipped with an overflow system to evacuate the excess water that it could receive.
  • the circulation of the water vapor in the tube 420 takes place in the direction indicated in 423 on the figure 4 from the top of the vessel 1 to the heat exchanger 408.
  • the supply of cold oil from the tank 51 to the separator 2 takes place in the direction indicated at 55 in this figure.
  • the device according to the invention comprises means for placing under reduced pressure in the frying tank 1, preferably but not Limitatively advantageously constituted by the compressor 422 also involved in the system for recovering water vapor released during frying. It is also provided with means for sealing at low pressure.
  • Preferred means for rotating the central shaft 122 of the vessel 1 are shown very schematically on the figure 1 and in more detail on Figures 5 to 7 .
  • These means are for example, mainly for reasons of space, arranged in the upper part of the tank 1.
  • a slider 123 is disposed in the tank, substantially perpendicular to the central shaft 122, which is located by the reference 124 on the figure 5 .
  • This shaft 122 which has not been shown for reasons of clarity, extends rearward perpendicularly to the plane of this figure.
  • the slider 123 is able to be displaced in translation, in a direction perpendicular to the axis of the shaft 122, by a piston 125 actuated by a jack, for example a pneumatic cylinder, shown in FIG. figure 1 .
  • the sliding is carried out along a rail 126 supported by a ring 127, illustrated on the Figures 5 and 7 .
  • This ring 127 is fixed to the peripheral wall 102 of the tank 1, by conventional means in themselves.
  • the slide 123 On an upper face facing the top of the tank 1, the slide 123 carries two cam protruding respectively 128 and 129, whose profiles are illustrated on the figure 6 .
  • cams apparently determine a path 132 on the upper face of the slide 123, as shown in FIG. figure 6 .
  • the slider 123 is associated with a rotating disc 133 fixed around the shaft 122 so as to be integral in rotation.
  • the slider is disposed under a lower face 134 of the disc facing the bottom of the tank, so that the cams 128, 129 are able to interact with rollers 135 carried on the underside of the disk 133.
  • a single roller 135 is shown.
  • the disk actually comprises a plurality of rollers, which are arranged circularly over its entire periphery at regular intervals from one another. Each pebble is identified on the figure 5 by a pin 136 ensuring its attachment to the disk, and opening on the upper face 137 of the disc opposite the lower face 134.
  • the pitch between the rollers 135 is fixed, in connection with the dimensions and the relative position of the cams 128 and 129 relative to each other, to a value such that each translational movement of the slide 123, in a perpendicular direction to the axis of the shaft 122, in one direction or the other, causes the displacement of a roller along the path 132 formed by the cams 128 and 129, and thereby a rotational movement, according to the direction indicated in 138 on the figure 5 133.
  • This rotation drives, via the shaft 122, the displacement of the blades 121 which are integral with it in the tank 1.
  • This die 113 is in the form of a disc pierced in its center of a plurality of extrusion orifices 114.
  • a front face 115 of this disc, facing the inside of the vessel 1, is shown in plan on the figure 8 .
  • the die At the rear of the extrusion orifices 114, at a rear face 117 opposite to the front face 115, the die preferably has cutting edges 116 intended to cut the biomass before it is introduced into the vessel 1.
  • cutting edges 116 intended to cut the biomass before it is introduced into the vessel 1.
  • the invention does not exclude the fact that the introduction of the biomass into the tank is carried out through an extrusion die of any other form, especially of conventional form in itself, that is to say without cutting areas, or even directly through the opening 106 formed in the peripheral wall 102 of the vessel 1, without any extrusion die.
  • the dimensions of the device according to the invention are determined according to the type and amount of biomass to be treated, its water content, the heating value desired for the fried material and oil used, according to calculations within the skill of the art.
  • the device according to the invention is for example implemented as follows.
  • the operation parameters are chosen generally according to calculations within the reach of the person skilled in the art, depending not only on the nature of the biomass to be treated but also the desired water content for the fried material, directly related to its calorific value, and the target energy efficiency during these processing operations. Values of the operation parameters are given below by way of example only, without being in any way limiting to the invention.
  • This fluid may for example emanate from fish or meat fat waste, which have been melted beforehand. It can also be recycled oil.
  • the oil poured into the tank 1 flows naturally through the window 105 formed in the bottom of the tank, through the conduit 31, to fill the separator 2. Once it is filled, the oil level increases in the tank 1 as and when pouring.
  • the oil is poured in an amount such that it completely covers the blades 121 disposed at the bottom of the tank 1, and that its level exceeds 1.5 to 2 times the height of these blades in the tank.
  • approximately in the device is poured an amount of oil of between 1 and 2 m 3 , which is distributed between the tank 1, for a volume of about 0.2 m 3 , the separator 2, for a volume of about 0.7 m 3 , and the oil circulation circuit.
  • a reduced pressure is applied to the tank 1 by means of the compressor 422. Any other means known per se for placing under reduced pressure also comes within the scope of the invention.
  • the operating pressure is preferably selected to be about 0.5 atm.
  • the decrease in the pressure in the tank 1 causes the decrease in the temperature necessary for the boiling of the water contained in the biomass that will be introduced into the oil bath.
  • the device according to the invention can however also be operated at atmospheric pressure.
  • the temperature difference of the oil between the bottom of the separator 2 and the tank 1 is at least 10 ° C.
  • the movement of the blades 121 is initiated by the driving means of the rotary central shaft 122. With each movement of the piston 125 driving the slide 123 in translation, it is printed on the shaft 122 a rotational movement on itself. same, which causes the blades to move in the tank 1. The rotation is in the direction inducing the longest path of movement of the blades between the opening 106 for introducing the biomass into the tank 1 and the window 105 arranged in its lower wall 101.
  • the invention does not exclude the fact that the biomass is introduced into the tank 1 in any other way.
  • the biomass can be milled and introduced into the tank without any other operation, including extrusion, the general objective of the invention being to bring into the tank small elements obtained from the initial wet biomass, and having a large contact surface with the oil contained in the tank.
  • the wet biomass is introduced into the tank through the opening 106 directly into the oil bath, into one of the compartments 144 formed between two neighboring blades 121.
  • the biomass stuck in this compartment is then driven by the blade 121 delimiting the rear of the compartment, defined in the direction of advance of the blades, until it finally reaches the window 105 through which it falls, under the effect of its weight, in direction of the separator 2.
  • the biomass is dehydrated by frying, according to a phenomenon known per se, to form a material, for example a fuel, which is solid and of reduced water content relative to the initial biomass.
  • the shaft 122 is printed with a slow rotation speed of 1 revolution in 5 to 20 minutes.
  • the embodiment according to the invention incorporating a rotating blade wheel which is the subject of the figures and described above is particularly advantageous, in particular in that it allows precise control of the residence time of the biomass in the water. oil, it requires little maintenance because of its simple constitution, and it allows the reduced pressure of the tank, since only must be ensured a seal at the passage of the piston 125 through the wall of the tank.
  • the use of the rotary blade system in accordance with the invention makes it possible to obtain a large contact surface of the biomass with the oil, and a good control of the heat transfer occurring in the bath, as a result of a relatively low biomass / fluid mass ratio. This results in a very great control of the water content of the fried material.
  • the fried material is discharged from the separator by the evacuation means 210, through the opening 209 provided for this purpose at the bottom of the separator.
  • the speed of extraction of the fried material is determined, according to calculations within the reach of those skilled in the art, so as to ensure a time of the residence of this material in the separator 2 sufficient to allow the transfer of the heat it has stored when frying to the oil.
  • the operation of the device according to the invention is advantageously operated continuously, both for the introduction of the biomass in the tank 1 and for the rotation of the blades 121 and the evacuation of the solid material as it accumulates in the the bottom of the separator 2.
  • the oil contained in the device is also circulated continuously between the separator 2 and the vessel 1, via the double circulation closed circuit, under the action of the pumps 405 and 410.
  • the flow rates of these pumps are determined according to calculations within the skill of those skilled in the art, in order firstly to maintain the equilibrium of the thermal differences between the oil contained in the tank 1 and the separator 2, and secondly to allow optimum operation of the heat exchanger 408.
  • the oil taken from the upper part of the separator 2 advantageously has a high temperature, partly due to the heat it has recovered from the fried material, and only a small contribution of energy is required to bring it to a boiling point at the pressure applied in the vessel 1.
  • This energy input is partly ensured by the heat exchanger 408 which operates from the energy of the water vapor released during frying.
  • a supply of cold oil emanating from the tank 51 is automatically carried out in the separator 2.
  • This supply makes it possible to increase the level of oil.
  • the introduction of cold oil is preferably carried out in the lower part of the separator, so as to maintain an optimum temperature gradient in it and to stop the boiling of the fried material as soon as it arrives in the bottom of the separator.
  • the device according to the invention as described above advantageously makes it possible to manufacture up to 80 kg / h of a fuel that can have a lower heating value of up to 20 MJ / kg.
  • the present invention achieves the objectives it has set for itself.
  • it provides a device for treating biomass by frying, in particular to form a solid fuel, which requires only a small contribution of external energy for its operation and which makes it possible, for a low cost price, to form a fuel with high calorific value, water content very well controlled.
  • This device is an effective tool for the recovery of wet waste.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Frying-Pans Or Fryers (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Claims (12)

  1. Vorrichtung zur Aufbereitung feuchter Biomasse durch Frittieren, eine erste Wanne (1) umfassend, die ein erstes Ölbad (108) enthält, Mittel, um das genannte erste Bad auf einer Frittiertemperatur zu halten, die das Frittieren der Biomasse sicherstellt, und Mittel zum Einbringen (111) der Biomasse in die genannte erste Wanne (1), Mittel zur Beförderung (3) festen, frittierten Materials aus der genannten ersten Wanne (1) in Mittel zur Trennung des genannten frittierten Materials vom Öl durch Absetzklärung in Form einer zweiten Wanne (2), die ein zweites Ölbad (211) niedrigerer Temperatur, als der genannten Frittiertemperatur, enthält, und mit dem genannten ersten Ölbad (108) kommuniziert, und Mittel (210) zur Entnahme des festen frittierten Materials aus der genannten zweiten Wanne (2), dadurch gekennzeichnet, dass die genannte Vorrichtung umfasst:
    - Mittel zur Regulierung der Aufenthaltsdauer der Biomasse im ersten Ölbad (108), ein drehbares Schaufelrad aufweisend, das im genannten ersten Ölbad (108) angeordnet und in der Lage ist, die Biomasse aus einem Einbringbereich der genannten Biomasse in die erste Wanne (1) zu einer Ausgangsöffnung (105) zur zweiten Wanne (2) zu fördern,
    wobei die genannten Mittel, die in der Lage sind, das Öl des genannten ersten Bades auf einer Frittiertemperatur der Biomasse zu halten, Mittel (401) zum Abziehen von Öl aus der genannten zweiten Wanne umfassen, Mittel zum Aufheizen (408, 408') des abgezogenen Öls und Mittel (412) zum Einleiten des so aufgeheizten Öles in die genannte erste Wanne (1).
  2. Vorrichtung nach Patentanspruch 1, dadurch gekennzeichnet, dass die Mittel zum Aufheizen des abgezogenen Öls Mittel (422) zum Ableiten des Wasserdampfes umfassen, der in der ersten Wanne (1) beim Frittieren freigesetzt wird, und Mittel (408) für einen Wärmetausch zwischen dem aus der zweiten Wanne (2) abgezogenen Öl und dem genannten Wasserdampf, der aus der genannten ersten Wanne (1) abgeleitet wird.
  3. Vorrichtung nach irgendeinem der Patentansprüche 1 bis 2, dadurch gekennzeichnet, dass die Mittel zur Beförderung (3) festen, frittierten Materials aus der ersten Wanne (1) in die zweite Wanne (2) aus einer Leitung (31) bestehen, die durch Schwerkraft wirkt und die Verbindung zwischen dem ersten Ölbad (108) und dem zweiten Ölbad (211) herstellt.
  4. Vorrichtung nach Patentanspruch 3, dadurch gekennzeichnet, dass die genannte zweite Wanne (2) unter der ersten Wanne (1) angeordnet ist, die genannte Leitung (31) eine untere Wand (101) der genannten ersten Wanne mit einem oberen Bereich der genannten zweiten Wanne verbindet und die Mittel (210) zur Entnahme des festen frittierten Materials aus der zweiten Wanne (2) in Höhe eines gegenüberliegenden unteren Bereichs (202) der genannten zweiten Wanne arbeiten.
  5. Vorrichtung nach Patentanspruch 3 oder 4, dadurch gekennzeichnet, dass die genannte Leitung (31) in einen oberen Bereich der zweiten Wanne (2) mündet und sich im Inneren der genannten zweiten Wanne in einem Tauchrohr (204) fortsetzt, um einen gegenüberliegenden unteren Bereich (202) zu erreichen.
  6. Vorrichtung nach Patentanspruch 5, dadurch gekennzeichnet, dass das genannte Tauchrohr mit Schaufeln (206) versehen ist, die in Richtung des genannten unteren Bereichs der zweiten Wanne geneigt sind.
  7. Vorrichtung nach irgendeinem der Patentansprüche 1 bis 6, dadurch gekennzeichnet, dass die genannte Ausgangsöffnung (105) zur zweiten Wanne (2) in einer unteren Wand (101) der genannten ersten Wanne ausgebildet ist.
  8. Vorrichtung nach irgendeinem der Patentansprüche 1 bis 7, dadurch gekennzeichnet, dass sie Antriebsmittel umfasst, um das genannte Rad in unterbrochene Drehungen zu versetzen.
  9. Vorrichtung nach irgendeinem der Patentansprüche 1 bis 8, dadurch gekennzeichnet, dass sie Mittel zur Aufrechterhaltung eines im Wesentlichen konstanten Ölspiegels in der ersten Wanne (1) durch Einleiten kalten Öls in die zweite Wanne (2) aufweist.
  10. Vorrichtung nach irgendeinem der Patentansprüche 1 bis 9, dadurch gekennzeichnet, dass sie Mittel zur Erzeugung eines Unterdrucks im Inneren der ersten Wanne (1) aufweist.
  11. Vorrichtung nach irgendeinem der Patentansprüche 1 bis 10, dadurch gekennzeichnet, dass die erste Wanne (1) in einem oberen Bereich Tropfenabscheider aufweist, die geeignet sind, Ölrückstände aus dem Wasserdampf zu entfernen, der beim Frittieren über dem ersten Ölbad (108) entweicht.
  12. Vorrichtung nach irgendeinem der Patentansprüche 1 bis 11, dadurch gekennzeichnet, dass die Mittel zum Einführen der Biomasse in die erste Wanne (1) ein Spritzmundstück (113) umfassen, das durch eine Wand (102) der genannten ersten Wanne angeordnet ist und auf einer dem ersten Ölbad (108) abgewandten Rückseite (117) Schneidzonen (116) aufweist, sowie Mittel zum Einspeisen von Biomasse in das genannte Spritzmundstück.
EP10741999.6A 2009-08-18 2010-08-13 Vorrichtung zur verarbeitung von nasser biomasse mittels brennen Not-in-force EP2467661B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0955698A FR2949256B1 (fr) 2009-08-18 2009-08-18 Dispositif de traitement de biomasse humide par friture
PCT/EP2010/061818 WO2011020787A1 (fr) 2009-08-18 2010-08-13 Dispositif de traitement de biomasse humide par friture

Publications (2)

Publication Number Publication Date
EP2467661A1 EP2467661A1 (de) 2012-06-27
EP2467661B1 true EP2467661B1 (de) 2013-07-17

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EP (1) EP2467661B1 (de)
CN (1) CN102597674A (de)
ES (1) ES2428750T3 (de)
FR (1) FR2949256B1 (de)
MA (1) MA33532B1 (de)
PT (1) PT2467661E (de)
TN (1) TN2012000066A1 (de)
WO (1) WO2011020787A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3043453B1 (fr) * 2015-11-05 2019-06-14 Cleef System Installation et procede de sechage d'un produit dans un etat pateux

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR714063A (fr) * 1930-04-16 1931-11-06 Procédé pour la dessiccation de graines et de fruits oléagineux
US3239946A (en) * 1961-12-06 1966-03-15 Pillsbury Co Dehydrating apparatus
US3314160A (en) * 1961-12-06 1967-04-18 Pillsbury Co Dehydrating apparatus
US3310881A (en) * 1966-03-14 1967-03-28 Pillsbury Co Apparatus and method for continuous drying
US3451828A (en) * 1968-08-14 1969-06-24 Int Basic Economy Corp Processes for dehydrating heat sensitive solid materials
US3928677A (en) * 1972-12-08 1975-12-23 Firewood Inc Process of treating wood
US3953927A (en) * 1975-03-24 1976-05-04 Hydrocarbon Research, Inc. Drying coal in hot oil slurry using recycled steam
CN2105851U (zh) * 1991-07-29 1992-06-03 侯锦辉 减压油炸脱水装置
NO177731C (no) * 1992-07-15 1999-03-22 Norsk Hydro As F¶rprodukt og fremgangsmÕte for fremstilling av samme
CN2171291Y (zh) * 1993-08-28 1994-07-13 秦皇岛通海科技发展公司 一种真空低温油炸装置
KR20090029385A (ko) 2007-09-18 2009-03-23 한밭대학교 산학협력단 바이오디젤유 부산물 또는 동·식물성 지방기름을 비롯한 연료용 유류 및 유류 폐기물을 이용한 유기성 슬러지의 고형연료 제조장치 및 제조방법

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Publication number Publication date
ES2428750T3 (es) 2013-11-11
MA33532B1 (fr) 2012-08-01
WO2011020787A1 (fr) 2011-02-24
FR2949256B1 (fr) 2013-05-24
FR2949256A1 (fr) 2011-02-25
PT2467661E (pt) 2013-09-20
EP2467661A1 (de) 2012-06-27
CN102597674A (zh) 2012-07-18
TN2012000066A1 (fr) 2013-09-19

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