EP3491312B1 - Séchoir par contact - Google Patents

Séchoir par contact Download PDF

Info

Publication number
EP3491312B1
EP3491312B1 EP17745331.3A EP17745331A EP3491312B1 EP 3491312 B1 EP3491312 B1 EP 3491312B1 EP 17745331 A EP17745331 A EP 17745331A EP 3491312 B1 EP3491312 B1 EP 3491312B1
Authority
EP
European Patent Office
Prior art keywords
drying
heating
heat
dried
tubes
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.)
Active
Application number
EP17745331.3A
Other languages
German (de)
English (en)
Other versions
EP3491312A1 (fr
Inventor
Dr. Swantje M. SCHLEDERER
Dr.-Ing. Thomas STEER
Hans Werner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Floradry GmbH
Original Assignee
Floradry GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Floradry GmbH filed Critical Floradry GmbH
Priority to PL17745331T priority Critical patent/PL3491312T3/pl
Publication of EP3491312A1 publication Critical patent/EP3491312A1/fr
Application granted granted Critical
Publication of EP3491312B1 publication Critical patent/EP3491312B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
    • F26B3/20—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source being a heated surface, e.g. a moving belt or conveyor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
    • F26B3/22—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration

Definitions

  • the invention relates to a contact dryer for drying moist material and a method for drying moist material.
  • the thermal drying of moist goods has always been an important technical process.
  • the material and the liquid contained therein are surrounded by air or another gaseous medium into which the liquid can evaporate.
  • the mixture of gaseous medium and steam is also known as vapor.
  • the basic principle of thermal drying is the introduction of heat into the goods to be dried.
  • the goods to be dried and the liquid contained therein are heated here.
  • the actual drying process begins as soon as the temperature of the product reaches the temperature that corresponds to the partial pressure of the vapor of the liquid to be dried in the surrounding atmosphere. Physically, this corresponds to an equilibrium between the vapor of the liquid and the liquid on the surface of the product, an equilibrium between condensation and evaporation. This state of equilibrium is known as the state of saturation. There is a saturation pressure for every temperature and a saturation temperature for every pressure.
  • the vapor pressure is higher than the saturation pressure, the vapor condenses by forming droplets. If the vapor pressure is lower than the saturation pressure, the liquid evaporates. When condensing heat is released, when evaporating heat is required. Condensation and evaporation take place until a new state of equilibrium is reached through the exchange of substances and energy. This equilibrium temperature is also known as the dew point.
  • a frequently used process of thermal drying is drying by convection.
  • a gas mostly air releases part of its thermal energy to the material to be dried and the liquid contained therein by cooling and in return absorbs part of the liquid contained in the material to be dried as vapor.
  • the absorption of steam also increases the dew point of the gas.
  • the gas cannot therefore be cooled down to the temperature which corresponds to the dew point at the beginning of the drying process, but only to the temperature which corresponds to the dew point at the end of the absorption of steam. This temperature at the end of the drying process is also known technically as the wet bulb temperature.
  • the air was started to circulate several times, to recirculate it. This increases the overall load of the air with water vapor, but at the same time also increases the wet bulb temperature and thus the temperature of the drying process.
  • the wet bulb temperature always corresponds to the temperature of the exiting air and the load with water vapor corresponds to the difference between the incoming fresh air and the exiting exhaust air.
  • Convection dryers basically have the property of carrying light particles of the goods with them. As a rule, you therefore need a separator for dust. In the case of many biogenic substances, not only water but also some organic compounds are evaporated. These organic compounds are mostly odorous, so that in addition to the dust separator, the dryer often also requires a so-called biofilter in order to separate these odorous organic substances from the exhaust air.
  • contact drying In addition to the convection dryer, there is also what is known as contact drying as a drying process. With the contact dryer, the product itself is heated directly through contact with a solid surface.
  • the water to be evaporated is heated above the dew point temperature and evaporated.
  • the dew point temperature is determined by the amount of air that flows into the contact dryer. By changing this amount of air, the dew point temperature can also be changed as required.
  • the surface temperature of the drying tube is always well above the dew point temperature. In the course of the drying process, less and less water is available on the surface of the goods, which can evaporate and absorb the heat transferred from the surface of the drying tube, so that the heat heats the product itself. In the case of a contact dryer, there is therefore a general tendency for the material to take on the temperature of the surface of the drying tube at the end of the process. Only the part of the surface on which the material to be dried and the drying tube touch (contact surface) is decisive. If this surface temperature could damage the product, appropriate measures are required to ensure that the material only comes into contact with the hot surface of the drying tube for a short time and then there is enough time to transport the heat supplied inside, where there is still water is present that must be expelled.
  • a contact dryer With the contact dryer there is no forced relationship between the expelled water and the air flowing in and out. A contact dryer is therefore not subject to the efficiency restrictions of convection dryers and theoretically allows efficiencies of almost 100%.
  • the performance of a contact dryer is determined by the amount of heat that can be transferred to the material to be dried via the solid surface of the drying tube.
  • the effective contact areas (contact areas) are usually relatively small and only make up a fraction of the total surface of the drying tube. This results in a significant restriction for contact dryers, which so far have only been able to prevail over convection dryers in special cases.
  • Hot water, steam or thermal oil can be used as heat transfer media. This requires separate closed circuits that increase the complexity of the contact dryer and reduce its practicability; this is complex in terms of construction and process technology and is associated with additional costs.
  • a main function of the screw in the prior art is to bring the material to be dried again and again into contact (contact) with the hot surface and also to limit the contact time through the continuous movement of the material.
  • Further functions of the screw in the prior art are the conveyance, mixing and ventilation of the material to be dried. If the dryer is set at an angle, the conveying function can also be taken over by a weir at the outlet, which is used to set the filling level in the screw dryer. In this case the screw has a pure mixing function, not a conveying function.
  • the disadvantage of this prior art method is always the direct coupling of the rotation the screw with the heat input, so that this design is suitable for relatively dry input materials, such as. B. mechanically pre-drained biomass, only suitable to a very limited extent.
  • a drying device for bulk material is known.
  • This drying device combines the contact drying process with a convection drying process in a device in the form of a rotating drum.
  • a heating surface which is heated in the form of pipes or pipe-like internals by means of hot water or steam.
  • a convection drying section follows the contact surfaces over the remaining length of the rotating drum. This is intended to combine the advantages of both processes.
  • the disadvantage of this known rotary drum dryer is the continuous rotary movement of the drum, which is necessary in order to constantly move the material to be dried in order to achieve adequate and uniform drying while the material is in the dryer.
  • the twin screw contact dryer is enclosed in a heating jacket embedded, which has to be heated to 120 ° C to 250 ° C, for which hot thermal oil or superheated steam is used.
  • the interior and thus also the double-walled heating jacket are each designed in the form of a horizontal "8" (description, column 4, lines 23-30).
  • the construction of the entire drying system, including the jacketed twin-screw contact dryer, is relatively complex, which disadvantageously increases the equipment costs for such a sludge drying system.
  • This known drying device is constructed in such a way that a steam dryer that only takes over the rest of the drying capacity is provided as the main dryer.
  • the combination of steam and flue gas is intended to achieve the advantage that a highly overheated, relatively dry atmosphere is created in order to dry coal.
  • a reactor for generating a fuel gas from mechanically dewatered sludge is known.
  • the pyrolysis reactor described consists of several double-tube heat exchangers, each of which has an inner tube with a hollow screw and an outer tube.
  • the sludge to be dried is conveyed in the inner pipe by means of the hollow screw, whereby a heating gas is fed in countercurrent in the outer pipe.
  • At least two double-tube heat exchangers of the same type are connected to one another in a series arrangement.
  • This invention covers not a dryer, but as a process a reactor for coupling several double-tube heat exchangers, which have different tasks in the process and thus different physical parameters such as e.g. B. have the temperature or the chemical composition of the expelled gases.
  • the invention does not provide any structural coupling.
  • the object of the present invention is to dry moist material, in particular biomass, in an energetically favorable and energetically effective manner by means of a dryer with a simple structural design in a cost-effective manner.
  • This object is achieved by a contact dryer with the features according to claim 1 and by a method which works with such a contact dryer with the features according to claim 6.
  • Appropriate further developments are defined in the respective dependent claims.
  • This type of contact dryer is particularly suitable for drying fibrous, fine-grained, pasty or dusty materials, such as. B. grass, leaves, algae, paper and sewage sludge, digestate, spent grains, food, sawdust, with or without mechanical pre-drying, pretreatment or processing.
  • fibrous, fine-grained, pasty or dusty materials such as. B. grass, leaves, algae, paper and sewage sludge, digestate, spent grains, food, sawdust, with or without mechanical pre-drying, pretreatment or processing.
  • the contact dryer according to the invention is used to dry moist material, with biomass in particular being considered as the moist material.
  • the basic structure of the contact dryer according to the invention has at least one drying tube in which the material to be dried can be conveyed through the drying tube by means of a conveyor device provided inside, which can preferably be a screw conveyor, with a heating medium being located on the outside of the drying tube and the The drying tube and the heating medium are surrounded by an envelope forming a jacket space.
  • the jacket space which preferably has an axial extension, has at least one further drying tube in its interior, the material to be dried from at least two drying tubes not being able to mix in the jacket space at at least one point.
  • the individual drying tubes of the contact dryer are preferably coaxial with one another and coaxial with the jacket.
  • the jacket space is insulated from the outside to avoid heat loss.
  • the jacket space limits the spatial expansion area of the heating medium.
  • the shell space is preferably designed as a cylindrical body which accommodates a plurality of drying tubes and encompasses them together.
  • the cylindrical design is particularly suitable for absorbing the pressure that prevails in the heating medium (pressure vessel). With this design, heating pressures of up to approx. 40 bar can be achieved, which corresponds to a heating temperature of approx. 250 ° C. With normal drying temperatures for biomass of below 200 ° C, mostly even below 100 ° C and heating temperatures of a maximum of 250 ° C, mostly even below 160 ° C, this is more than sufficient and allows optimal operation in any case.
  • the shell space is tubular and each has an end region in the form of a flat bottom.
  • This has the advantage that the degree of dryness to be achieved for the moist material to be dried can also be influenced or determined over the length of the contact dryer in addition to the heating power supplied, depending on the design selected.
  • the tubular basic structure of the shell space also has the advantage that it forms the ideal shape of a pressure body.
  • the drying tubes located in the drying area can easily pass through the jacket space at its respective end areas sealing lids are performed. This construction is particularly simple, since these covers (preferably flat bottoms) can simply be drilled after rolling or deep-drawing, at least in the areas in which drying tubes are located.
  • the jacket space is also heated inside. It then has a heating area and a drying area in the interior, drying tubes being arranged by definition in the drying area and heating tubes being arranged by definition in the heating area.
  • a jacket space can also comprise several heating and / or drying areas.
  • the heating tubes can be arranged coaxially to the drying tubes. This is always advantageous when the heating is carried out by a gaseous medium. If a liquid or a condensing gas is used for heating, the installation of serpentine heating pipes is recommended.
  • the jacket space is preferably provided in the lower area with tubes through which a medium for heating (heat supply medium) flows.
  • a medium for heating heat supply medium
  • the heat supply medium is preferably hot flue gas from a combustion, but can in principle be any form of hot heat transfer medium, for example also thermal oil, liquid metal salts or liquid metals.
  • the hot flue gas can also be, for example, the exhaust gas from a piston engine or a gas turbine. If the flue gas contains dust or soot components, the heating pipes would be provided according to the invention with a cleaning facility that can be used either during operation or also when not in use.
  • these heating pipes can also be arranged directly below the jacket space and serve as a hot well (condensate collection space) of the jacket.
  • the shell space would be connected to the heating pipes via one or more collectors, provided these are not connected individually and directly to the shell space.
  • this arrangement offers various advantages.
  • the heat transfer on the air side (heat supply, heat supply medium) is always significantly lower than on the water side (heat absorption).
  • the heating Air heat supply medium
  • ribs can advantageously be applied to the tubes, which ribs significantly increase the effective heat transfer surface and thus the heat transfer coefficient.
  • the size of the dryer can be further reduced in this way. This means that the entire jacket space is available for drying pipes, as there is no installation space for the heating pipes. Furthermore, there is no space between the heating and drying pipes, which is necessary to absorb the fluctuating water level between cold and warm conditions and the various outputs.
  • a heating medium is applied to the jacket space, which changes the phase from vapor to liquid when heat is given off and condenses on the outer surface of the drying tubes.
  • the condensation temperature corresponds exactly to the dew point temperature at the vapor pressure with which the jacket space is exposed. This leads to a uniform heating temperature on the inside of the drying tubes, where the goods to be dried are located.
  • the goods to be dried can in no case assume a higher temperature than the surface temperature of the drying tubes.
  • the maximum temperature of the goods to be dried can be set very precisely by regulating the pressure of the steam in the jacket space.
  • the heating medium can be water vapor. Depending on the desired drying temperature, these can also be organic media, typical representatives for this are the commercially available refrigerants.
  • the jacket space is only partially filled with the condensate.
  • the remaining space inside the jacket is filled by the vapor phase.
  • the vapor pressure here can be both above and below the ambient pressure.
  • the vapor or gaseous phase of the heating medium has the advantage that even with a relatively dense and compact arrangement of the individual drying tubes within the drying area, the very good heat transfer during the phase change (here condensation) ensures sufficient heating and thus efficient drying.
  • the shell space is then advantageously provided with a controlled ventilation or extraction system in order to avoid inert gases in the shell space of the dryer.
  • the inventive arrangement of the heating area in the jacket space or directly below makes it possible to design the jacket space as a closed pressure body.
  • the jacket space works as a self-contained natural circulation steam generator with an integrated steam circuit. During operation, it does not require any further procedural connections with the environment and no further external units, in particular no connection to an external steam generator, no water treatment and no water treatment. It is considerably cheaper in terms of investment and operating costs. The same applies analogously to the use of commercially available refrigerants or other substances that change phase. All that is required is a safety valve that protects the jacket space against overpressure.
  • the arrangement of the heating in the lower part of the jacket and in the form of smoke pipes or an external heat exchanger makes it possible to use a solid fuel firing system for heating, even with low outputs, without the heat exchanger clogging up due to the dust in the flue gas (heat supply medium).
  • the contact dryer according to the invention is advantageously constructed in such a way that it can be transported in a 20 "or 40" container. It has only a few and simple connections to the outside world, so that it can easily be brought to different locations and used there - even for a short time - without this having a negative impact on economic profitability.
  • the 20 "or 40" container is advantageously designed in such a way that it serves as a housing after the contact dryer has been set up and z.
  • B. represents a weather protection; the same applies to possible sound insulation. A building that requires building permits can then be dispensed with, which makes use more flexible.
  • This basic structure of a casing forming a jacket space with at least two drying tubes and possibly one or more heating tubes and with a heating medium inside the jacket space has the advantage that the material to be dried is physically separated from the heating medium, so that cleaning with the heating medium entrained parts of the goods to be dried, as is the case with the prior art, are omitted.
  • the heating medium can be supplied with heat energy in direct contact with the heating pipes and in the drying area this energy is transferred directly to the drying pipes in the form of heat and from there this heat energy is fed to the moist material to be dried conveyed inside the drying pipe for the purpose of drying can, results in an effective energetic balance of this two-part contact dryer, in which the drying area and the heating area are coupled to one another via the heating medium, so that the supply of heating medium from the heating area into the drying area and the return of the heating medium from the drying area into the heating area in can be implemented in the simplest manner, because this does not require any built-in components within the contact dryer.
  • the screw helix can also be replaced by a soulless helix or any other conveying device such as B. a piston, a Chain conveyors, single or double screws with the same or variable pitch and helix height can be replaced.
  • a soulless helix or any other conveying device such as B. a piston, a Chain conveyors, single or double screws with the same or variable pitch and helix height can be replaced.
  • the conveying device can thus be operated at any speed, as a result of which the dwell time of the goods to be dried in the dryer can be set as desired.
  • Several contact dryers can also be connected in series or in parallel, provided that this is advantageous for drying the goods to be dried.
  • the heating by flue gas or another heat supply medium can be carried out sequentially or in parallel.
  • the jacket can also be set up inclined or vertically, provided that the material to be dried can also be conveyed solely by gravity or, for example, by vibrating the entire dryer.
  • This type of drying avoids any heating of transport air for the vapors (mixture of air coming into contact with the material to be dried and escaping steam) and allows full use of the heat supplied to evaporate the water or the liquid that is to be expelled.
  • a suction device is preferably provided at at least one end area of the jacket when the drying tubes pass through the jacket, by means of which dust and expelled vapors entrained during drying, i.e. the expelled liquid as gas (e.g. as water vapor, also mixed with air and also for Partly containing foul-smelling organic components) can be sucked off and do not get into the environment.
  • the expelled liquid as gas e.g. as water vapor, also mixed with air and also for Partly containing foul-smelling organic components
  • the absorbed heat of evaporation can be cooled in a heat exchanger recover with condensation at a high temperature level.
  • the vapors advantageously contain more than 20% steam, ideally more than 50%.
  • the dryer can advantageously also be heated with the waste heat from the vapors by condensing the vapors at a higher temperature after the compression. In this case, you only need the mechanical energy to operate the compressor.
  • the vapors are not diluted with air or other inert gases. They can therefore easily be cleaned of the organic substances in small filters without voluminous filter systems. The organic substances can also be further concentrated before cleaning if vapor condensation takes place. This further reduces the size of the filter.
  • the dryer according to the invention is heated by combustion, the vapors formed during drying can, according to the invention, be fed directly to the combustion.
  • the organic components are burned directly through the combustion and converted into carbon dioxide and water vapor.
  • the particles entrained during the drying process can ideally be collected and disposed of together with the ashes of the fuel without being released into the atmosphere as pollutants.
  • the utilization of the vapors in a furnace is a simple way of burning the unpleasant odorous organic substances and also the dust. This is usually forbidden in the case of firing with a combustion grate, since then the integration of the vapors into the air management of the combustion is no longer sensible, since the required combustion temperatures can no longer be guaranteed.
  • the vapors are preferably used as secondary air in fluidized bed combustion, which basically consists of pre-combustion in the fluidized bed and post-combustion above the fluidized bed (in terms of process technology after the fluidized bed); the fluidized bed combustion works in this area without excess air, so that the integration can take place while maintaining the combustion temperatures.
  • this combination with a fluidized bed furnace has the further advantage that the waste heat in the heat transfer medium (flue gas) can largely be used to preheat the combustion air after it has left the heating pipes of the dryer, which is not possible with grate firing.
  • the efficiency is optimized with a combination of dryer and fluidized bed combustion. This combination not only optimizes the process efficiency. It also advantageously avoids the otherwise complex and expensive use of a biofilter.
  • the heat released during fluidized bed combustion would be used advantageously to heat the dryer. In this way, optimal synergies would arise, especially when using sewage sludge.
  • a machine is used in front of the dryer, e.g. B. an ORC system, a steam cycle, a Stirling engine or an indirectly heated gas turbine.
  • the vapors would preferably be added in the pre-combustion.
  • the goods to be dried and the dried goods do not have to come into contact with oxygen-containing air. If the product forms dust and there is a risk of explosion, this can be avoided simply by drying in an air-free atmosphere.
  • the dryer is therefore particularly suitable for drying dusty and explosive goods.
  • the heat introduced into the contact dryer for thermal drying is used, in addition to a small amount for heating the material to be dried to the drying temperature, exclusively for the evaporation of the liquid to be expelled.
  • the efficiency of the dryer is defined as the ratio of the heat used for evaporation to the heat introduced. This ratio is significantly higher in the contact dryer according to the invention than in convection dryers and is very close to 100%. There is also an efficiency advantage compared to other contact dryers, since the surface exposed to the environment is smaller and thus the heat losses are reduced.
  • the surface area relevant for heat losses drops from 35 x 0.2 m in circumference (traditional contact dryer according to the prior art) to the circumference of the jacket with a diameter of 2.2 m and thus with a length of 8 m, the total surface area from 176 m 2 to 55 m 2 .
  • the 40 or so heating pipes are also integrated into the jacket; the integration of the heating tubes in a traditional contact dryer according to the state of the art is not possible; In the prior art, this consequently leads to additional surfaces with heat losses in the external steam generator and the connecting pipes.
  • the goods to be dried should be exposed to a minimum temperature for a certain period of time in order to achieve appropriate effects.
  • This can advantageously be achieved in the contact dryer according to the invention by setting the drying temperature.
  • the desired effect can be, for example, sterilization or pasteurization, but also targeted killing of all active bacteria.
  • the dryer can also be operated in a mobile application. This is particularly useful when waste heat is available, for example from the drive motors of trucks or ships. In this case, only surge brakes have to be installed in the water phase in order to avoid sloshing of the condensate as a reaction to the rolling, yawing and pitching movements of the means of transport.
  • a heat supply medium is passed through which supplies heat to the heating medium located in the jacket space via the walls of the heating pipe, the heating medium in the jacket space surrounding the heating pipe on the outside.
  • the advantage of such a construction of the contact dryer according to the invention is that a controllable amount of thermal energy can be supplied to the heating medium via the heat supply medium passed through the heating pipes, so that the degree of dryness of the moist material to be dried in the drying pipes can be influenced in a controllable manner.
  • a plurality of drying tubes and also a plurality of heating tubes are preferably provided in the jacket space.
  • the drying tubes are arranged as tube batteries in the jacket space, i.e. in the drying area of the jacket space. This also applies equally to the arrangement of several heating pipes, which are preferably also provided in the form of a pipe battery in the heating area of the jacket space.
  • such a contact dryer can be regulated with the aid of regulating the steam pressure in the jacket space. If the energy input into the heating medium in the shell space takes place directly with flue gas, the output of the unit that provides the heat would be regulated in such a way that the pressure in the shell space is constant.
  • the regulation of the drying temperature can be regulated via the dew point temperature.
  • the dew point temperature can easily be measured.
  • the drying tubes are exposed to the material to be dried with a higher or lower amount of air (from the environment).
  • the vapors mixed of the ambient air and the steam
  • the vapors would preferably be sucked off in order to work dust-free and odor-free on the outside.
  • the temperature is to be above ambient pressure, according to the invention no further amount of air is given up, but the outflow of the then almost pure steam is passed through a throttle.
  • the pressure in the throttle is adjustable and reduced.
  • this principle can also be applied to drying under negative pressure (with no or little ambient air), with the vapors or steam then having to be compressed after leaving the dryer.
  • the thermodynamic efficiency of the dryer increases in this case. This effect has to be weighed against the additional electrical consumption of the compressor.
  • pressure sensors are connected to the drying tubes, by means of which the pressures prevailing in them can be fed as pressure signals to a control device, on the basis of which heat energy corresponding to the pressure values can then be fed to the heating tubes in such a way that the drying temperature in the drying tubes can be regulated as a function of pressure.
  • the degree of drying of the moist goods in the drying tubes or with the contact dryer is determined by the intended use of the dried goods. In some applications, a slightly higher residual moisture content will be important, while for certain applications a relatively high degree of dryness is aimed for.
  • a method for drying a moist material, in particular biomass is provided, which is operated with a contact dryer of the type described above.
  • the material to be dried is passed in the same direction through one or more drying pipes running in an axially extending jacket space coaxially to the jacket space, while a heating medium located in the jacket space in its heating area, which - if present - surrounds at least one heating pipe, via which heat energy is added to the heating medium is supplied, the heating medium being fed to the drying tubes in the drying area of the jacket space, inside which the moist material to be dried is dried.
  • a preferred method step for the method according to the invention is the detection of the pressure inside the drying tubes by means of a pressure sensor, the pressure signal generated by the pressure sensor being fed to a control device on the basis of which the drying process is controlled or regulated.
  • a temperature can also advantageously be set at which organically contaminated goods such as. B. sewage sludge to be sanitized; In the case of sewage sludge, the minimum temperature for sanitation is 70 ° C.
  • the pressure is also possible for the pressure to be controlled or regulated on the basis of the heating medium temperature and / or the conveying speed of the material in the drying tubes. If the energetic expenditure required for drying is not to be increased, but a higher degree of dryness of the moist material to be dried is to be achieved, such a higher degree of drying can be achieved by reducing the conveying speed of the material to be dried through the drying tubes.
  • a soulless screw as a conveying element allows free-flowing goods to be easily fed into the drying tubes by pouring over the screws in the feed area. Overfilling the dryer can be avoided simply by changing the slope or placing a core pipe in the entry area.
  • the screws are preferably offset and arranged in pairs.
  • the entry in the individual pairs is preferably made in steps or steps from a common template.
  • This template can consist of inclined walls to avoid bridging and / or be provided with a loosening device, as it is, for. B. represents a vibration drive, one or more compressed air nozzles or a spindle.
  • the soulless screws are preferably driven from the discharge side so that the screw spirals are subjected to tension, not pressure.
  • the conveying device in the interior of the drying tubes for transporting the goods to be dried is preferably designed as a soulless screw, which can preferably be subjected to tensile loads.
  • the drying tubes can be provided with wear protection on the inside.
  • the preferred or optimal size fits well with a modular design in 20 or 40 ft containers, so that the systems can be used in a modular manner, in particular can also be used at different locations.
  • Fig. 1 shows the first embodiment according to the invention of a contact dryer (1) as a natural circulation steam generator with an integrated condenser for the thermal drying of a material to be dried (2) with the aid of an evaporating heating medium (3).
  • the spatial extent of the contact dryer is defined by the jacket tube (6) and the two end regions (7, 8).
  • the jacket pipe (6) is designed so that pressures of up to 40 bar (temperatures of approx. 250 ° C) can be achieved, the pressure being determined by the heating power introduced into the heating medium (3).
  • the length of the jacket pipe (6) is variable and according to the invention can be structurally adapted to the heat requirement for the drying or the required area.
  • the end areas (7, 8) can be easily constructed using perforated plates, at least in the drying area (4).
  • the drying area (4) which comprises the drying tubes (9), is located in the upper area of the jacket tube (6).
  • the drying tubes (9) run from the entry-side end area (7) to the discharge-side end area (8) coaxially to the jacket tube (6), are physically separated from one another and penetrate both end areas (7, 8).
  • the material (2) to be dried is conveyed through the contact dryer (1) by means of conveying elements (10) and dried by introducing heat.
  • the dried material (11) leaves the contact dryer (1) at the discharge-side end area (8) with a defined residual water content.
  • the residual water content can be regulated via the drying temperature and the conveying speed.
  • the heating area (5) which contains a defined number of heating tubes (12), is arranged in the lower area of the jacket tube (6).
  • the heating pipes (12) run from the inlet end region (7) to the discharge end region (8) coaxially with the casing tube (6), penetrate both end regions (7, 8) and have a hot heat supply medium (13) flowing through them.
  • the heat contained in the hot heat supply medium (13) is released during the flow to the heating pipes (12) and through them to the heating medium (3).
  • the cooled heat supply medium (14) leaves the jacket tube on the discharge side.
  • the heat absorbed by the heating medium (3) leads to the evaporation of the heating medium (3) in the heating area (5) at constant temperature and constant pressure.
  • the resulting steam rises from the heating area (5) to the drying area (4) and condenses there at the same pressure and temperature as during evaporation at the drying tubes (9), releasing its latent heat to the drying tubes (9) and the inside drying good (2).
  • the condensate runs down the drying pipes (9) and drips back into the heating area (5) where it is evaporated again. This results in a closed natural circulation, which ensures heat transport between the heating area (5) and drying area (4) without further units or connections with the environment.
  • the thermal drying process releases water in vapor form within the drying tubes (9), which mixes with any air that may be present to form vapors (15). These must be removed from the drying tubes (9) in order to ensure a high level of efficiency.
  • This is implemented by a suction device (16) which is connected to the drying tubes (9) when the discharge-side end region (8) passes through.
  • the evacuation of the vapors (15) also results in the evacuation of dust that occurs as a result of the movement of the conveying elements (10) in the material (2) to be dried.
  • the air supply (19) and the control valve (20) the proportion of air in the vapors can be controlled as required. This allows the drying temperature to be freely regulated.
  • control valve (20) would be arranged at the outlet and the fan (16) at the inlet of the drying tubes (9).
  • the conveying elements (10) take over the dosing of the goods to be dried (2) and thus regulate the filling level of the drying tubes (9), on the other hand they define the dwell time of the goods to be dried (2) within the drying area (4) via the conveying speed. .
  • the conveying elements (10) are driven on the discharge side, so that the conveying elements (10) are subjected to tensile stress.
  • the residence time can be adapted according to the invention so that enough water can be removed from the goods (2) to be dried, depending on the drying temperature.
  • the dryer is supplied with material to be dried by filling the storage container (21) to above the level of the uppermost drying tubes (9).
  • the metering itself takes place with the help of a variable speed of the conveying elements (10) and - associated with this - a different amount of conveyed good to be dried.
  • the delivery rate can be regulated by changing the pitch of the screw helix of the conveyor element (10) or partially blocking the cross section of the screw helix in the storage container (21), for example by means of core tubes.
  • the drying tubes (9) are offset and arranged in pairs, the pairs being arranged in steps or steps.
  • the structurally complex introduction of heat via the conveying elements (10) can be omitted due to the sufficient heating surface and the conveying elements (10) can be designed simply as a screw helix.
  • Fig. 2 shows a second embodiment of a contact dryer (1) according to the invention as a natural circulation steam generator with an external steam generator for thermal drying of an item (2) to be dried with the aid of an evaporating heating medium (3). While the drying area (4) is identical to that in Fig. 1 The illustrated embodiment of the contact dryer (1) and the heat transfer between the heating area (5) and drying area (4) also takes place in the same way, the difference in FIG Fig. 2 The illustrated embodiment of the contact dryer (1) in the design and positioning of the heating area (5).
  • the heating area (5) in Fig. 2 is in this case not contained in the casing pipe (6), but arranged below the casing pipe (6) and connected to the casing pipe by a riser pipe (17) and a downpipe (18).
  • the hot heat supply medium (13) flows around the heating pipes (12) and the heating medium (3) flows through it.
  • the heat dissipation of the hot heat supply medium (13) leads to evaporation of the heating medium (3), which rises in vapor form in the riser pipe (17) and thus reaches the jacket pipe (6) and the drying area (4).
  • the condensation of the heating medium (3) takes place with the release of latent heat to the drying tubes (9) and a reflux into the lower part of the jacket tube (6).
  • the heating pipes (12) are preferably slightly inclined, namely rising towards the riser pipe (17).
  • the area available for the heat transfer on the side of the heat supply medium (13) can be increased considerably in a structurally simple manner by means of ribs.
  • the overall size can be reduced by relocating the heating area (5) and / or, if necessary, the number of drying tubes (9) can be increased.
  • contact dryers (1) can be connected in parallel or in series, provided that it is advantageous for drying.
  • the contact dryer (1) is regulated by regulating the steam pressure in the jacket tube (6) via the heat output introduced by the heat supply medium (13).
  • the steam pressure determines the temperature at the drying tubes (9).
  • the drying temperature can be regulated by drawing off the vapors (15) from or by supplying air (19) into the drying tubes (9) by means of the control valve (20).
  • FIG. 3 Fig. 4 and Fig. 5 show a storage container of a contact dryer according to the invention from different perspectives.
  • Fig. 6 a conveyor device or organ (10) designed as a screw helix with a core tube (22).
  • the material to be dried (2) is fed into the storage container (21) by means of an upstream conveyor system such as, for example, screw conveyors, conveyors, conveyors or solids pumps.
  • the storage container (21) itself is preferably designed to be gas-tight and pressure-tight at operating pressures that differ from the ambient pressure, in order, for example, to be able to ensure the removal of vapors and odorous substances and to minimize the entry of false air.
  • the walls of the storage container (21) are advantageously inclined and tapered upwards in order to counteract the formation of bridges between the materials used.
  • pneumatic discharge aids e.g. air / gas nozzles
  • oscillating discharge aids e.g.
  • the material to be dried (2) is filled into the storage container (21) up to above the level of the uppermost drying tubes (9). With a corresponding, uniform and constant filling level, this also ensures that the interior of the drying tubes (9) is sealed against the environment and thus reduces the introduction of additional air that has to be heated into the drying area (4).
  • the conveying elements (10) of the contact dryer (1) - designed here as a screw helix - are open and are covered with the material (2) to be dried.
  • the conveying elements (10) take over the dosing of the goods to be dried (2) and thus regulate the filling level of the drying tubes (9), on the other hand they define the dwell time of the goods to be dried (2) within the drying area (4) via the conveying speed.
  • the conveying elements (10) are driven on the discharge side, so that the conveying elements (10) are subjected to tensile stress.
  • the residence time can according to the invention be adapted so that enough water can be withdrawn from the item to be dried (2) depending on the drying temperature.
  • the metering itself takes place with the aid of a variable speed of the conveying elements (10) and - associated therewith - a different conveyed amount of material to be dried.
  • the delivery rate can be regulated by changing the pitch of the screw helix of the conveyor element (10) or partially blocking the cross section of the screw helix in the storage container (21), for example by means of core tubes (22).
  • the core tube can either be firmly connected to the screw or attached to the rear wall or attached to an end plate attached to the drying tube. In the first case the core tube (22) would rotate with the screw, in the other two cases the screw would rotate around the core tube (22).
  • the core tube (22) advantageously protrudes from the storage container (21) and into the inlet (24).
  • a limitation as a metering aid (23) can be arranged on the underside of the conveying elements (10).
  • the dosing aid (23) can be designed, for example, as a bowl, mesh basket or rods. Fig. 4 ). Only in the case of free-flowing goods can the distance be selected to be larger, since the goods flow by themselves into the conveying elements (10) located below.
  • a drying tube (9) with an outside diameter of, for example, 168.3 mm and a wall thickness of 4 mm, the result is a conveying cross-section (inside diameter) of 160.3 mm. If you now arrange two drying tubes (9) in the same plane with a center distance of 320 mm and another one in the middle below, the entire filling cross-section is discharged.
  • This arrangement of several horizontal planes is called a step.
  • stages of drying tubes (9) can be arranged in the dryer. If the item (2) to be dried is not free-flowing, trays are preferably arranged as metering aids (23). The entry areas of the various stages are arranged axially offset in this case.
  • the material to be dried (2) is a non-free-flowing material (e.g. pasty goods such as sewage sludge), instead of metering via core tubes (22) and screw pitch, metering via displacement pumps (e.g. diaphragm pumps) can also be used , Piston pumps, eccentric screw pumps, rotary piston pumps or peristaltic pumps).
  • metering via displacement pumps e.g. diaphragm pumps
  • Piston pumps eccentric screw pumps
  • rotary piston pumps rotary piston pumps or peristaltic pumps
  • the material (2) to be dried is metered into the drying tube (9) via an inlet (24) and then dried in the contact dryer (1) as described above.
  • the conveyor elements (10) transfer the dried material (11) into an outlet. From this, the dried material (11) falls into a collecting container.
  • this is preferably gas-tight and pressure-tight, in order to be able to guarantee an extraction of the vapors and odorous substances and to work at operating pressures that differ from the ambient pressure.
  • the joint discharge of the dried material (11) from the collecting container takes place with the help of conveying technology such as, for example, conveying screws, conveying plates, conveying belts or solids pumps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)

Claims (13)

  1. Séchoir par contact permettant de sécher de la matière humide, composé d'au moins un tube de séchage (9) dans lequel la matière à sécher (2) peut être transportée et sur la face extérieure duquel un milieu chauffant (3) se trouve dans un tube de gainage (6) entourant au moins partiellement le tube de séchage (9), dans lequel au moins un autre tube de séchage (9) est disposé dans le tube de gainage (6) réalisé sous forme de réservoir sous pression, et les au moins deux tubes de séchage (9) sont réalisés de telle sorte que la matière à sécher (2) ne peut pas se mélanger sur au moins un tronçon longitudinal des au moins deux tubes de séchage (9), dans lequel le tube de gainage (6) n'effectue aucun mouvement rotatif et le milieu chauffant (3) est de la vapeur d'eau ou un milieu organique qui passe en cours de fonctionnement, en cas d'apport de chaleur, à une phase au moins partiellement sous forme de gaz ou de vapeur et qui se condense à nouveau en phase liquide lorsque la chaleur est dissipée, dans lequel, dans le tube de gainage (6) se trouve au moins un tube de chauffage (12) par lequel de la chaleur peut être apportée au fluide chauffant (3), et le tube de chauffage (12) est disposé de telle sorte que le milieu chauffant (3) entoure au moins en partie le tube de chauffage (12) en cours de fonctionnement, ou que ledit au moins un tube de chauffage (12) se trouve à l'extérieur du tube de gainage (6) et est relié au tube de gainage de telle sorte que la zone de chauffage, dans laquelle est disposé ledit au moins un tube de chauffage (12), et une zone de séchage, dans laquelle les au moins deux tubes de séchage sont disposés dans le tube de gainage (6), constituent un réservoir sous pression commun, dans lequel la zone de séchage est disposée au-dessus de la zone de chauffage de telle sorte que le condensat s'écoule de la zone de séchage dans la zone de chauffage sous l'effet de la gravité.
  2. Séchoir par contact selon la revendication 1, caractérisé en ce qu'auxdits au moins deux tubes de séchage (9), un dispositif d'aspiration (16) est relié qui permet d'aspirer des fumées.
  3. Séchoir par contact selon l'une quelconque des revendications précédentes, caractérisé en ce que les au moins deux tubes de séchage (9) présentent respectivement un dispositif de transport (10) qui permet de transporter la matière à sécher.
  4. Séchoir par contact selon la revendication 3, caractérisé en ce que le dispositif de transport (10) est réalisé sous la forme d'une vis sans fin sans âme ou d'un plateau transporteur.
  5. Séchoir par contact selon la revendication 4, caractérisé en ce que la vis sans fin sans âme est sollicitée en traction en cours de fonctionnement.
  6. Procédé permettant de sécher une matière humide, en particulier de la biomasse, à l'aide d'un séchoir par contact selon l'une quelconque des revendications 1 à 5, dans lequel la matière à sécher (2) passe dans le même sens par plusieurs tubes de séchage (9) s'étendant en parallèle les uns aux autres dans le tube de gainage (6) s'étendant axialement et est séchée à l'intérieur de ceux-ci pendant qu'un milieu chauffant (3) se trouvant dans une zone de chauffage est soumis à de l'énergie thermique, est guidé dans le tube de gainage (6) entourant les tubes de séchage, dégage sur la face extérieure des tubes de séchage de la chaleur aux tubes de séchage (9), et change alors au moins partiellement de phase, dans lequel la chaleur dégagée est utilisée pour sécher la matière humide dans les tubes de séchage (9), et le tube de gainage (6) n'effectue aucun mouvement rotatif, et le milieu chauffant (3) est de la vapeur d'eau ou un milieu organique qui passe en cours de fonctionnement, en cas d'apport de chaleur, à une phase au moins partiellement sous forme de gaz ou de vapeur, et se condense à nouveau en phase liquide lorsque la chaleur est dissipée.
  7. Procédé selon la revendication 6, caractérisé en ce qu'une pression pour chauffer le séchoir qui est différente de la pression ambiante est appliquée dans le tube de gainage (6).
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que dans les tubes de séchage (9) de la zone de séchage, une pression prédéfinie, qui est différente de la pression ambiante, est appliquée pour le séchage par une régulation active.
  9. Procédé selon la revendication 8, caractérisé en ce que la température de séchage prédéfinie est réglée par la pression dans les tubes de séchage (9).
  10. Procédé selon la revendication 8 ou 9, caractérisé en ce que les tubes de séchage (9) de la zone de séchage sont soumis à différents niveaux de température.
  11. Procédé selon l'une quelconque des revendications 6 à 10, caractérisé en ce que les fumées du séchoir sont amenées à une chaufferie qui fournit la chaleur destinée à l'opération de séchage.
  12. Procédé selon la revendication 11, caractérisé en ce qu'une partie de la matière à sécher et/ou une partie de la matière séchée sont amenées à la chaufferie et fournissent donc de la chaleur destinée au séchage.
  13. Procédé selon l'une quelconque des revendications 6 à 12, caractérisé en ce que le séchoir est chauffé par les fumées comprimées.
EP17745331.3A 2016-07-28 2017-07-28 Séchoir par contact Active EP3491312B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17745331T PL3491312T3 (pl) 2016-07-28 2017-07-28 Suszarka kontaktowa

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016213956.8A DE102016213956A1 (de) 2016-07-28 2016-07-28 Kontakttrockner
PCT/EP2017/069116 WO2018019979A1 (fr) 2016-07-28 2017-07-28 Sécheur par contact

Publications (2)

Publication Number Publication Date
EP3491312A1 EP3491312A1 (fr) 2019-06-05
EP3491312B1 true EP3491312B1 (fr) 2021-04-28

Family

ID=59416701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17745331.3A Active EP3491312B1 (fr) 2016-07-28 2017-07-28 Séchoir par contact

Country Status (4)

Country Link
EP (1) EP3491312B1 (fr)
DE (1) DE102016213956A1 (fr)
PL (1) PL3491312T3 (fr)
WO (1) WO2018019979A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108800838A (zh) * 2018-07-20 2018-11-13 日洋（天津）生物科技发展有限公司 过氧化钙生产工艺的余热回收系统

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60138383A (ja) * 1983-12-27 1985-07-23 イハラケミカル工業株式会社 乾燥装置及びこの乾燥装置を使用して乾燥する方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE427584C (de) 1924-01-23 1926-04-13 Allg Elek Citaets Ges Fa Verfahren zum Trocknen von Kohle auf uebereinanderliegenden Heizflaechen
CH265602A (de) * 1948-05-07 1949-12-15 Steinmann Wilhelm Beheizte Vorrichtung, insbesondere zum Zerkochen und Trocknen von Schlachtabfällen, Fischabfällen und dergleichen.
US4176465A (en) * 1977-07-18 1979-12-04 Natomas Company Heat saving method for drying wet solids
DE8709563U1 (fr) 1986-07-22 1987-09-10 Hans Pesch Gmbh & Co Kg, 4154 Toenisvorst, De
JPH0759709B2 (ja) * 1987-09-03 1995-06-28 三井鉱山株式会社 石炭の調湿方法
DE3911716A1 (de) 1989-04-10 1990-10-11 Wilfried Schraufstetter Verfahren zum trocknen von schlamm und schlammtrocknungsanlage zur durchfuehrung des verfahrens
US5220733A (en) * 1991-11-14 1993-06-22 21St Century Design Inc. Modular radiant plate drying apparatus
FR2784742B1 (fr) * 1998-10-20 2000-12-29 Gradient Ass Procede de traitement thermique de solides divises, et dispositif de mise en oeuvre dudit procede
JP4076968B2 (ja) * 2004-02-27 2008-04-16 株式会社スターサービス ペレット乾燥装置
JP2007160581A (ja) * 2005-12-12 2007-06-28 Star Seiki Co Ltd 樹脂ペレットの除湿乾燥装置及びその方法
JP4690273B2 (ja) * 2006-09-05 2011-06-01 株式会社御池鐵工所 乾燥装置
DE102009049909A1 (de) * 2009-10-20 2011-04-28 Ing. Häcker Maschinen GmbH Trocknungsanlage
DE102014113307B4 (de) 2014-09-16 2017-11-23 Gesellschaft Für Energie- Und Verfahrenstechnik Mbh Reaktor und Verfahren zur Erzeugung eines Brenngases aus mechanisch entwässertem Schlamm

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60138383A (ja) * 1983-12-27 1985-07-23 イハラケミカル工業株式会社 乾燥装置及びこの乾燥装置を使用して乾燥する方法

Also Published As

Publication number Publication date
DE102016213956A1 (de) 2018-02-01
PL3491312T3 (pl) 2021-11-08
EP3491312A1 (fr) 2019-06-05
WO2018019979A1 (fr) 2018-02-01

Similar Documents

Publication Publication Date Title
RU2682573C2 (ru) Многофункциональная установка по переработке фекальных масс и пищевых отходов и соответствующие способы
EP0379657B1 (fr) Procédé de séchage de boues
US9327997B1 (en) Water treatment process and apparatus
DE102008063661A1 (de) Trocknen von Fest-Flüssig-Mischsystemen
EP2543643B1 (fr) Universal double wall drying assembly
AT510487B1 (de) Trocknungsverfahren und trocknungssystem
WO2009010018A1 (fr) Dispositif permettant de sécher des matériaux pâteux et en vrac et des boues
WO2012095119A2 (fr) Procédé et installation permettant la récupération d'énergie à partir de la biomasse et des déchets combustibles, en particulier des matières premières renouvelables, ainsi que leur carbonisation
DE102008039005A1 (de) Trocknungsanlage mit doppelwandiger Trommelmischer für Klärschlamm
EP2352960B1 (fr) Procédé et dispositif pour générer une vapeur de traitement par combustion de lignite déshydratée
EP3491312B1 (fr) Séchoir par contact
EP0373577B1 (fr) Procédé de traitement de boues d'épuration ou de boues industrielles à parties organiques par le procédé de conversion
EP2140217B1 (fr) Procédé pour sécher un matériau humide
DE102010026589B4 (de) Verfahren zum Trocknen von Trockengut in einem Trockner und indirekt beheizter Trockner
EP3421914B1 (fr) Séchoir vertical
EP1378494B1 (fr) Procédé et installation pour traiter des résidus d'origine biologique, en particulier des boues
DE4407536A1 (de) Verfahren und Vorrichtung zur Vermeidung von Brandgefahren bei der Entfeuchtung von Schlämmen
DE10224173A1 (de) Verfahren und Vorrichtung zur Sterilisation und Nachtrocknung von Produkten nach einer Kurzzeittrocknung
EP3491293B1 (fr) Combustion étagée
AT411254B (de) Verfahren und vorrichtung zur verarbeitung biogener reststoffe, insbesondere von schlämmen
DE4118783A1 (de) Verfahren und anlage zum behandeln von schlamm- und presskuchen
DE19542301B4 (de) Verfahren und Einrichtung zum Trocknen von schlammartigem Trockengut, insbesondere Klärschlamm
EP2395306A2 (fr) Procédé et dispositif de séchage de fibres, notamment de copeaux de bois
DE8424789U1 (de) Trenneinrichtung zum thermischen Trennen von Substanzgemischen
DE2754070B2 (de) Verfahren zum Aufbereiten von Abwasserklärschlamm

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20190226

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20200129

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20201106

GRAJ Information related to disapproval of communication of intention to grant by the applicant or resumption of examination proceedings by the epo deleted

Free format text: ORIGINAL CODE: EPIDOSDIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

INTC Intention to grant announced (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

INTG Intention to grant announced

Effective date: 20210312

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1387522

Country of ref document: AT

Kind code of ref document: T

Effective date: 20210515

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502017010227

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: NL

Ref legal event code: FP

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210728

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210728

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210830

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210729

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210828

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502017010227

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20210731

26N No opposition filed

Effective date: 20220131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210731

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210828

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210728

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210728

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20170728

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20230720

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20230724

Year of fee payment: 7

Ref country code: AT

Payment date: 20230718

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20230714

Year of fee payment: 7

Ref country code: FR

Payment date: 20230724

Year of fee payment: 7

Ref country code: DE

Payment date: 20230929

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210428