• 专利附录
  • 专利说明
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    • 专利摘要:
    ABSTRACT The present invention relates to a heat recovery system and method for heat recovery in anorganic material digestion plant, also referred to as a Biogas production plant system andmore specifically to a combined pre and post well, adapted to be used in a biogas productionplant system comprising a digester and wherein the combined pre and post well, comprisesa pre well adapted to store organic material and a post well adapted to store digest residue from the continuous feeding digester, and the pre well and the post well are separated by awell heat conducting partition.
    公开号:SE1150885A1
    申请号:SE1150885
    申请日:2011-09-27
    公开日:2013-03-28
    发明作者:Erik Erjeby
    申请人:Swedish Biogas Internat Ab；
    IPC主号:
    专利说明:

    A COMBINED PRE AND POST WELL AND IT”S USE IN A BIOGAS PRODUCTIONPLANT SYSTEM TECHNICAL FIELD The present invention relates to a heat recovery system and method for heat recovery in an organic material digestion plant, also referred to as a Biogas production plant system 1.BACKGROUND There are different known processes useful for extraction of biogas in Biogas productionplants or organic material digestion plants. These known processes are either one- or two-step processes, wherein the waste or the formed fertilizer is used once or twice before it is removed from the Biogas production plant.
    Biogas production plants uses anaerobe digestion and digests organic material without thepresence of oxygen. The speed of the anaerobe digestion and thus the speed of formation ofbiogas is dependent on the digestion temperature. The actual digestion is enabled forexample by the presence of methanogens, which are microorganisms that are able to producemethane. Different species of microorganisms are able to survive at different temperatureranges. The ones living optimally at temperatures between 35-40 °C are called mesophiles ormesophilic microorganisms which are the most used kind of biodigesters in the world. Someof the microorganisms can survive at the hotter and more hostile conditions of 55-60 °C;these are called thermophiles or thermophilic microorganisms. These latter types of microorganisms may also be used as digesters. The digestion consumes a lot of energy.
    Another form of digestion takes place in an aerobe digestion process wherein oxygen isentered into the digestion process. A common example of aerobe digestion is compostingwherein organic material is decomposed and recycled as a fertilizer and soil amendment. Theend products of the aerobic digestion process are primarily carbon dioxide and water. Thisdiffers from an anaerobe process used in the Biogas production plant system 1 of the presentinvention, wherein an anaerobic digestion of organic matter renders biogas as one of the products.
    The anaerobe digestion process described in the present invention consumes a lot of heatduring the digestion phase. To save energy some anaerobe Biogas production plants have acounter flow heat exchanger system installed. In a counter flow heat exchanger system theorganic material meets the digested substrate in a counter flow wherein the different media are separated by a solid wall made of a heat conductive material.
    The digester in an anaerobe biogas production plant is commonly equipped with a heating and/ or cooling equipment to enable heating and/ or cooling of the digester cistern.Specific background Today, the heating of the biogas process normally takes place inside the biogas reactor, eitherby tubes fixed to the wall or by using a circulation system. To save some energy, the incomingslurry organic material for example manure can be pre-heated in a counter-flow heatexchanger, wherein the warm digested substrate from the digester meets the cold incoming manure.
    Still, there is a need for a more efficient energy recovery system within Biogas productionplants, especially for those Biogas production plants wherein the biogas is to be distributedand sold as raw biogas or CNG (Compressed Natural Gas) and not directly used as an energysource in a CHP-unit (Combined Heat and Power unit) for production of electricity and heat to the Biogas production plant.
    There is a need to find Biogas production plants with higher energy efficiency to save production costs and energy resources.
    Therefore, there is a need for cost and energy efficient solutions on how to minimize the amount of heat that is needed in the biogas process.
    RELATED ART US 2,516,o76 discloses an example of how manure may be heated inside a digester usingexternal heating sources. This prior art more specifically discloses a method and apparatusfor digesting sewage sludge or trades wastes under proper temperature conditions. In orderto obtain a proper temperature for digestion, sludge from the digestion tank is pumped fromthe tank through a heater, heating the sludge, whereby the heated sludge is pumped back intothe tank. The heating in the heater is performed by introducing heat obtained through forexample burning of gas produced in the digestion tank, burning of oil, or heat exchange witha heating jacket of an internal combustion engine utilizing the produced gas, all of whichrequire adding external energy to the heater from an external heating source or uses the produced Biogas.
    OBJ ECT OF THE INVENTION One object of the present invention is to manage a Biogas production plant as cost effective and energy efficient as possible without use of the formed Biogas.Other objects are;Finding a more energy efficient biogas plant.
    Reducing methane and ammonia losses in the digested residue orfertilizer formed in Biogas production plants.
    SUMMARY The heat recovery system and the method of the present invention reduces the energyconsumption in the Biogas production plant system 1 according to the invention bypreheating the incoming organic material, for example manure, using heat exchange betweena pre well comprising cold organic material and a post well comprising warm digestionresidue. The heat exchange in the combined well according to the invention is performedthrough a heat conductive partition between the pre and post Wells. The heat exchange is alsoreferred to as direct heat exchange between the incoming organic material in the pre well andthe outgoing digestion residue in the post well. As the heat transfer is performed withoutaddition of external energy, the operating costs are kept at a minimum. In this way the redundancy heat from the digester is efficiently utilized.
    The biogas production plant system 1 according to the invention is adapted for anaerobicdigestion processes using methanogens enabling for the digestion. Methanogens aremicroorganismss which digests organic materials without presence of oxygen. Examples ofmethanogens are for example mesophiles or thermofiles. The biogas production plant system1 according to the invention is preferably adapted to processes using methanogens, preferably using mesphiles.
    Further the system according to an exemplifying embodiment of the invention may have anadditional heat pump system transferring heat recovered from the combined well into thedigester. The heat recovery of the present invention is very energy efficient, since no externalheating source is needed and just limited amount of electrical power is consumed by the heatpump. For instance, no external boiler for heat supply is needed, as in present biogas production plant systems.
    One or more embodiments of the present invention may solve or minimize the problemsmentioned above. This is achieved by a product, system or method according to the invention and the claims.
    According to a first aspect of the invention, a combined pre and post well (14) according tothe invention is adapted to be used in a biogas production plant system. It is also adapted for an anaerobe digestion process and comprises; - a digester (24), and a combined pre and post well (14). The combined pre and post well (14) comprises; - a pre well (12) adapted to store organic material, and, - a post well (16) adapted to store digest residue from the digester (24), and thepre well (12) and the post well (16) are separated by a well heat conductingpartition (160).
    The combined pre and post well (14) according to may be cylindrically shaped and the prewell (12) is surrounded by the post well (16) and wherein the warm digest residue in the post well (16) forms a mantle around the cold incoming organic material in the pre well (12).
    Further embodiments of the invention are described below. Said embodiments are eachcombinable with all other embodiments to form even further alternative embodiments of the invention; - the well heat conducting partition (160) is a wall separating the post well (12) and the prewell (16). -the well heat conducting partition (160) is made of a material selected from steel or glass/ carbon fiber or glass enameled coating of for example steel. -the combined pre and post well (14) may have any shape that allows for heat transfer between the pre well and a post well. -the organic material is selected from pasture crops, grain, cooking oil, potato shell, manure,slurry manure, slaughterhouse waste, organic household waste or various residues from the food industry or bio-energy industry. -the combined pre and post well (14) is further connected to an additional heat recoverysystem which comprises a heat pump (50) comprising two media circuits (46, 48) and wherein; -one first circuit (46) is connected with a first heat collector (40) placed in contactwith a warm post well 16; and-said heat pump (50) also is connected to a second circuit (48) which is connected to the digester (24) in order contribute by using recovered heat from the post well (16).-the first heat collector (40) is constructed as a flat heat exchange element.
    According to a second aspect of the invention a biogas production plant system (1) accordingto the invention, producing biogas and fertilizer, comprises a combined pre and post well (14) and a digester (24). The combined pre and post well (14), comprises; - a pre well (12) is adapted to store organic material , and, - a post well (16) is adapted to store digest residue from the digester (24), and the prewell (12) and the post well (16) are separated by a well heat conducting partition(160).
    Further embodiments of the invention are described below. Said embodiments are eachcombinable with all other embodiments to form even further alternative embodiments of the invention; -the well heat conducting partition (160) is a wall separating the post well (16) and the pre well (12). -wherein the well heat conducting partition 160 is made of a material selected from any of steel, glass/carbon fiber or glass enameled coating of for example steel. -wherein the combined pre and post well (14) may have any shape that allows for heat transfer between the pre well (12) and a post well (16) -wherein the combined pre and post well (14) is a cylindrically shaped combined pre and postwell (14) wherein the pre well (12) is surrounded by a post well (16) and wherein the hotdigest residue in the post well (16) forms a mantle around the cold incoming organic material in the pre well (12). -the organic material is selected from pasture crops, grain, cooking oil, potato shell, manure,slurry manure, slaughterhouse waste, organic household waste or various residues from the food industry and bio-energy industry. -the biogas production system (1) is further connected to an additional heat recovery system which comprises a heat pump (50) comprising two media circuits (46, 48) wherein; -one first circuit (46) is connected with a first heat collector 40 placed in contact witha warm post well (16); and-said heat pump (50) also is connected to a second circuit (48) which is connected to the digester in order contribute by using recovered heat from the post well (16).- the first heat collector (40) is constructed as a flat heat exchange element.
    According to a third aspect of the invention a method for digestion of organic material toproduce biogas in a biogas production plant system using the biogas production plant according to the invention wherein the organic material is; a) preheated in the pre well (12) of the combined pre and post well (14), due toheat transfer between the pre well (12) and the post well (16) b) transferred into the digester (24) and c) digested in the digester (24) using methanogens at a temperature between 35-70°C d) transferred to the post well (16) of the combined pre and post well (14)beforebeing discharged from the Biogas production plant system (1).
    A method for digestion of organic material to produce biogas according may also bedescribed to use organic material which comprises content selected from pasture crops,grain, cooking oil, potato shell, manure, slurry manure, slaughterhouse waste, organic household waste or various residues from the food industry and bio-energy industry.
    BREIF DESCRIPTION OF THE DRAWINGS Figure 1 shows a schematic view of a biogas production plant system 1 according to an exemplary embodiment according to the invention.
    Figure 2 shows an example of an cylindrical combined pre well and a post well where the postwell is enveloping the pre well and heat transfer between the the pre and post well is performed.
    Figure 3 shows an exemplary embodiment of a combined pre well and a post well according to the invention comprising a heat exchanger serving a heat pump, for heating of the digester.DETAILED DESCRIPTION Introduction The present invention concerns a Biogas production plant system 1 which digests organic material in an anaerobe digestion process which produces biogas and high quality fertilizer.
    Biogas is a term used to represent a mixture of different gases (varied composition) producedas a result of action of anaerobic microorganisms on organic material. It contains methane inbulk (50-68%) and other gases in relatively low proportions viz., C02 (25- 35%), H2 (1-5%),N2 (2-7%) and °O2 (o-o.1%).
    The organic material used in the Biogas production plant system 1 according to the inventionmay be any sort of organic material for example high fat, high protein or high carbohydratecontaining waste. Specific examples of waste suitable for use in the Biogas production plantof the present invention are; pasture crops, grain, cooking oil, potato shell, manure, slurrymanure, slaughterhouse waste, organic household waste or various residues from the foodindustry or bio-energy production. Most preferred organic material for use in the Biogasproduction plant system 1 according to the invention is slurry manure. The incoming organicmaterial already has high water content and around 3-1o% of dry matter and does not needto be further dampened before use in the Biogas production plant system 1 according to the invention.
    Method and system for Biogas production according to the invention Figure 1 shows the Biogas production plant system 1 and also the flow of organic material or manure through the system 1, illustrated by arrows.
    The flow starts for example in a cow or pig barn. A pumping well in a barn, where the wastefrom animal husbandry is collected, may be connected with a Biogas plant system 1 accordingto the invention. The connection between the pumping well in the barn is in the form of pipesand preferably also has a pump connected in order to get a flow of organic material from thepumping well to the inlet pipe 10 of the biogas production plant system 1, connected to thepre well 12 of the Biogas production plant system 1. The pre well 12 of the Biogas productionplant 1 is combined with a post well 16 and together forms a combined pre and post well 14according to the invention. The combined pre and post well 14 may be placed below theground level 200. The placement of the well below ground level 200 contributes to isolate around the well.
    The organic material or organic waste which is to be used in the digestive process may be pre-stored inside the pre well 12. This possible pre-storage may be important as it allows for the continuous flow of organic material to the digester 24. The pre well 12 may have one or severalinlets 10. The inlet 10 may be located anywhere on the pre well 12, for example on thetop, the side or the bottom of the pre well 12. The inlets may be constructed as pipes or forexample as a opening where solid material may be added to the pre well 12.Solid materialmay for example be fat or straw added directly to the pre well 12 of the biogas productionsystem 1 to give the organic material a desired texture. It is of importance that the mixture ofthe organic waste in the pre well 12 can be homogenized and stirred. Inside the pre well 12the organic material is homogenized and stirred and its texture may be altered in this step ofthe process before entered into the digester 24. The pre well 12 is preferably equipped with anagitator and/ or a macerator and/ or a pump 20, for example a submersible manure pump.An outlet pipe 18 used for transport of the cold organic material from the pre well may belocated anywhere on the pre well 12, for example on the top, the side or the bottom of the pre well 12.The biogas plant according to the present invention uses a continuous wet digestive process.
    The slurry in the pre well 12 has preferably a dry matter content of maximum 15% TS, forexample 3-15% or 7-12%. In the pre well 12, the organic material slurry is mixed andhomogenized and also pre heated before it is pumped through the outlet pipe 18 from the prewell 12. The heating of the slurry of organic material in the pre well 12 is due to a heatexchange between the warm digested residue stored in the post well 16 and the cold organic material stored in the pre well 12.
    The combined pre and post well 14 is constructed so that there always is at least a part of thepost well 16 in contact with the pre well 12 by a well heat conducting partition 160. In oneembodiment the post well 16 envelopes the pre well 12, for example the post well 16 isconstructed as a jacket around the pre well 12. In other embodiments the pre well 12envelopes the post well 16. Preferably the surface of the well heat conducting partition 160between the pre well 12 and the post well 16 is as large as possible. Larger surface gives betterheat transfer. The well heat conducting partition 160 is preferably made of a material whichis good for heat transfer, for example steel. Other materials suitable for use in theconstruction of the well heat conducting partition 160 as are for example steel with a glassenamel surface or fiberglass. It is of importance that the material or the construction holdingthe material is strong enough to form the walls (or well heat conducting partition 160) between the post well 16 and / or pre well 12.
    From the pre well 12, the cold organic material is then pumped, through an outlet pipe 18using a pump 20 to a digester 24 by way of normally one or several slurry heat exchangers 26.The cold organic material is pumped 1-50 times / day, for example 10 times / day to the digester 24.
    The slurry heat exchanger 26 also allows for heat transfer between, the colder incomingorganic material and the warmer outgoing digested residue. The heat transfer is due totransfer of heat through a slurry heat conducting partition 28 which separates the colder incoming organic material and the warmer outgoing digested residue.
    In the digester 24 the organic material from the pre Well 12 is stored for about 30-40 days, forexample 35 days, together with methanogens at a temperature of 35-70°C , for examplebetween 35-42°C. Methanogens are used to digest the organic material inside the digester24. Methanogens are active at the mentioned temperatures. Mesophiles are active in the preferred temperature interval 35-42 ° C.
    During this process, biogas is produced in the digester 24 and collected using gas collectingequipment 70, through a gas pipe 30. After 30-40 days of storage, during storage in thedigester 24, the warm digested residue is pumped, using a pump 32, through an outlet pipe34 via the slurry heat exchanger 26 where the digested residue releases some of its heat before reaching the post well 16.
    In the post well 16 of the combined pre and post well 14 according to the invention, the warmoutgoing digested residue is collected and stored for a few days, for example 3 days beforetransported using a pump 36 to a final storage. The digested residue, is used for example asfertilizer. The biogas production method according to the invention also lowers the methaneand ammonia losses from the digested residue since the pre well further cools the outgoingdigested residue before the final storage and use. Digested residue is an excellent fertilizercontaining nitrogen, phosphorus, potassium and other nutrients. It also adds organic matterto the soil which may improve soil structure, aeration, soil moisture-holding capacity, andwater infiltration. It is important during the production of the fertilizer that the ammonia losses due to for example evaporation of ammonia gases are reduced.
    The post well 16 is equipped with an agitator or pump for circulation of the digested residue,this improves the heat transfer which takes place in the combined pre and post well 14 andalso facilitates for the transport to the final storage of the formed digested manure or fertilizer residue.
    The different agitators used in the Biogas plant according to the invention may be placed inthe top or on the sides of the equipment. Stirring in the different containers in the system may also be achieved by pumps.
    The Biogas plant according to the present invention is controlled by a PC-based system whichfor example controls the timing for feeding of organic material into the different steps of the process described above.
    The Heat Recovery System according to the present invention reduces the energyconsumption in the Biogas production plant by preheating the incoming organic material andat the same time reduces methane and ammonia losses by cooling the outgoing digestionresidue/fertilizer. In this way the Biogas plant uses the energy which evolves during production of biogas.
    A system according to the invention when it is combined with a heat pump has no need for an external boiler for the heat supply.
    Suitable digesters for use in the Biogas production plant according to the invention are forexample continuous stirred tank reactors (CSTR-reactors) using a wet process. Examples of CSTR-reactors are; vertical-mixing or displacement digesters.
    The Biogas production plant of the present invention thus has at least two systems forefficient heat recovery; the combined pre and post well 14 and one or several slurry heat exchangers 26.
    EquipmentCombined well In the combined pre and post well 14 according to the invention the pre well 12 is adapted tostore organic material, and the post well 16 is adapted to store digest residue from thedigester. Further, the pre well 12 and the post well 16 are separated by a heat conductingpartition 160. The combined pre and post well solution according to the invention is anenergy efficient solution since it utilizes the heat which is left in the fertilizer residue before it finally is transferred to the storage.
    An exemplifying embodiment of the combined pre and post well 14 according to theinvention, where the pre well 12 has a circular or annular or cylindrical shape and the post well is shown in figure 2.
    A cylindrically shaped pre well according to the invention may for example have a diameter2o4. A diameter 2o2 of a cylindrical shaped post well 16 may be larger than the diameter 2o4 of the pre well 12, for example 5-50% larger.
    The wall, or the heat conducting partition 160 in the combined pre and post well 14 ispreferably made of a material that is at least fairly heat conductive, to enable heat transferbetween the wells, and strong enough not to change shape or collapse if the pressure on the partition is increased, for instance due to one of the pre and post wells being empty while the 11 other is full. Suitable materials may for example be steel but it may also be constructed fromglass fiber or similar materials, or a combination of mentioned materials to form a suitable construction.Additional heat recovery Another exemplifying embodiment of the described biogas production system 1 according tothe invention is further connected to an additional heat recovery system, see figure 3. Thisadditional heat recovery system comprises a for example a heat pump 50 or other suitableequipment which has two media circuits (46, 48). One first circuit 46, connected with a firstheat collector 40 placed in contact with the warm post well 16. The first heat collector 40 isconstructed as a heat exchange element, for example a flat heat exchange element. The heatpump 50 is also connected to a second circuit 48 which may be connected to the digester inorder contribute by using recovered heat from the post well. With this construction thebiogas production plant can efficiently be heated without any additional external heatingsource. The only energy input to the system is the electricity for the operation of the heatpump 50, circuit pumps and other equipment which may be used as macerator and/ or mixers or suitable agitators.
    In another exemplary embodiment of the invention the collector 40 is placed in contact withthe inner wall 60 of the post well 16 to efficiently collect heat to the heat pump 50 used forheat recovery, and transfer of the recovered heat to the digester 24. Further in the combinedpre and post well 14 may be placed below the ground level 200, in the ground 54. By usingthe additional heat pump and collector system described above, the Biogas production system becomes even more energy efficient.
    In further embodiments the collector 40 is placed anywhere in or nearby the post well where it may contact the warm organic material.
    权利要求:
    Claims (18)
    [1] 1. a pre well (12) adapted to store organic material, and, 2. a post well (16) adapted to store digest residue from the digester (24), and; wherein the pre well (12) and the post well (16) are separated by a well heat conducting partition (160).
    [2] 2. A combined pre and post well (14) according to any of the preceding claims wherein the combined pre and post well (14) is a cylindrically shaped and wherein the pre well (12) is surrounded by the post well (16) and wherein the warm digest residue in the post well (16) forms a mantle around the cold incoming organic material in the pre well (12).
    [3] 3. A combined pre and post well (14) according to claim 1 wherein the well heat conducting partition (160) is a wall separating the post well (12) and the pre well (16).
    [4] 4. A combined pre and post well (14) according to any of the preceding claims wherein the well heat conducting partition (160) is made of a material selected from steel or glass/carbon fiber or glass enameled coating of for example steel.
    [5] 5. A combined pre and post well (14) according to any of the preceding claims wherein the combined pre and post well (14) may have any shape that allows for heat transfer between the pre well and a post well.
    [6] 6. A combined pre and post well (14) according to any of the preceding claims wherein the organic material is selected from pasture crops, grain, cooking oil, potato shell, manure, slurry manure, slaughterhouse waste, organic household waste or various residues from the food industry or bio-energy industry.
    [7] 7. A combined pre and post well (14) according to any of the preceding claims wherein the combined pre and post well (14) is further connected to an additional heat recovery system which comprises a heat pump (50) comprising two media circuits (46,48) and wherein; 2 1. one first circuit (46) is connected with a first heat collector (40) placed in contact with a warm post well 16; and 2. said heat pump (50) also is connected to a second circuit (48) which is connected to the digester (24) in order contribute by using recovered heat from the post well (16).
    [8] 8. A combined pre and post well (14) according to claim 7 wherein the first heat collector (40) is constructed as a flat heat exchange element.
    [9] 9. A biogas production plant system (1), producing biogas and fertilizer, comprising a combined pre and post well (14) and a digester (24) characterized in that; the combined pre and post well (14), comprising; 1. a pre well (12) is adapted to store organic material, and, 2. a post well (16) is adapted to store digest residue from the digester (24), and; wherein the pre well (12) and the post well (16) are separated by a well heat conducting partition (160).
    [10] 10. A biogas production plant system GO according to claim 9 wherein the well heat conducting partition (160) is a wall separating the post well (16) and the pre well (12). ii.
    [11] 11. A biogas production plant system (1) according to any of claims 9-10 wherein the well heat conducting partition 160 is made of a material selected from any of steel, glass/carbon fiber or glass enameled coating of for example steel.
    [12] 12. A biogas production plant system (1) according to any of claims 9-11 wherein the combined pre and post well (14) may have any shape that allows for heat transfer between the pre well (12) and a post well (16).
    [13] 13. A biogas production plant system (1) according to any of claims 9-12 wherein the combined pre and post well (14) is a cylindrically shaped combined pre and post well (14) wherein the pre well (12) is surrounded by a post well (16) and wherein the hot digest residue in the post well (16) forms a mantle around the cold incoming organic material in the pre well (12).
    [14] 14. A biogas production plant system (1) according to any of claims 9-13 wherein the organic material is selected from pasture crops, grain, cooking oil, potato shell, manure, slurry manure, slaughterhouse waste, organic household waste or various 3 residues from the food industry and bio-energy industry.
    [15] 15. A biogas production plant system (1) according to any of claims 9-14 wherein the biogas production system (1) is further connected to an additional heat recovery system which comprises a heat pump (50) comprising two media circuits (46, 48) and wherein; 1. one first circuit (46) is connected with a first heat collector 40 placed in contact with a warm post well (16); and 2. said heat pump (50) also is connected to a second circuit (48) which is connected to the digester in order contribute by using recovered heat from the post well (16).
    [16] 16. A biogas production plant system (1) according to claim 15 wherein the first heat collector (40) is constructed as a flat heat exchange element.
    [17] 17. A method for digestion of organic material to produce biogas in a biogas production plant system using the biogas production plant according to any claims 9-16, wherein the organic material is; a) preheated in the pre well (12) of the combined pre and post well (14), due to heat transfer between the pre well (12) and the post well (16) b) transferred into the digester (24) and 3. digested in the digester (24) using methanogens at a temperature between 35-70°C 4. transferred to the post well (16) of the combined pre and post well (14)before being discharged from the Biogas production plant system (1).
    [18] 18. A method for digestion of organic material to produce biogas according to claim 17 wherein the organic material comprises content selected from pasture crops, grain, cooking oil, potato shell, manure, slurry manure, slaughterhouse waste, organic household waste or various residues from the food industry and bio-energy industry.
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    同族专利:
    公开号 | 公开日
    SE537344C2|2015-04-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2016-05-03| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150885A|SE537344C2|2011-09-27|2011-09-27|A combined pre- and post-well and its use in a biogas production plant|SE1150885A| SE537344C2|2011-09-27|2011-09-27|A combined pre- and post-well and its use in a biogas production plant|
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