Cypress essential oil recovery device from cypress cycle biofuel

Abstract

To provide a cypress essential oil recovery device that recovers both essential oil in steam discharged from a steam drying exhaust furnace for lumber board production and essential oil in biomass fuel before combustion.SOLUTION: Provided is an essential oil recovery device that recovers thick essential oil from exhaust steam from a wood steam drying pot 100 filled with wood 13 (lumber) and from thin essential oil that accumulates at a bottom of the pot. The essential oil recovery device comprises a first essential oil recovery device 200 that recovers essential oil from exhaust steam from a steam suction exhaust pipe 14 of the wood steam drying pot 100, and a second essential oil recovery device that recovers essential oil from the thin essential oil that accumulates at the bottom of the wood steam drying pot 100 and wood scraps 308 such as unprocessed cypress bark, sawn cypress lumber, and thinning materials. The cypress essential oil recovery device comprising the specific first essential oil recovery device 200 and the specific second essential oil recovery device, recovers thick essential oil from cypress cycle biofuel.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an "equipment for recovering cypress essential oil from cypress cycle biofuel" that utilizes all of the wood drying exhaust steam from the drying kiln to recover cypress essential oil from fuel biomass, wood shavings, bark, sawings, etc., and reuses the recovered wood as biomass fuel for the steam supply boiler to the drying kiln, advantageously achieving "carbon neutrality." [Background technology]

[0002] Traditionally, the wood drying exhaust steam was released into the atmosphere as a heat source, and essential oils such as cypress oil are extracted from the biomass fuel that was the source of steam for this drying kiln.By using both, it is possible to thoroughly recycle wood and extract essential oils, which takes a long time of 50 to 70 years, and cheap essential oils can be supplied.

[0003] The exhaust steam contains a lot of tar, so the main source of traditional essential oils is leaves. For this reason, the tar content is very low, but cypress itself has antibacterial properties and contains essential oils (temper), as well as phenols, alkaloids, and fatty acids, and has been used for hundreds of years in buildings compared to cedars and other materials.

[0004] The main components of wood are cellulose and lignin, and in order to use it as a building material, it takes 1 to 2 years to naturally dry the wood to remove the moisture (150% ± 10%) to min. 15 to 20%, so the wood was forced to be steam dried (70℃ to 140℃) for 6 to 10 days to remove the moisture. Steam drying of wood, which contains 60-70% cellulose and 40-30% lignin, begins from the outside, so rapid dehydration can lead to cracks in the back of the timber. For this reason, cracks caused by over-drying are generally reduced by computer operation based on experience and the amount of timber in the oven. However, the resin in the timber is also affected by the soil environment in which it was grown. In other words, there is the fertilizer (fallen leaves and inorganic compounds) for the green wood, the sunlight conditions, and the annual rings (differences in growth) (differences in moisture content), and the experience of the lumber manufacturer has a major impact.

[0005] For example, Patent Document 1 introduces a "method for recovering core wood components from wood drying waste liquid." In this method, the resin and essential oils that are abundant in the lignin portion of the core wood are self-defense substances that the wood itself possesses, and therefore have a strong anti-killing effect, making them particularly suitable for preventing termites. The oil is used by cooling the recovered steam and separating it from the water, but most of the oil is recovered. Because it has ammonia deodorizing effects, plant growth promoting effects, cement setting adjustment effects, and biological activity, it has many uses, such as as an air freshener, essential oil for aromatherapy, and bath additive. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] Wood Chemistry Lecture 4 Kaiseisha Chemistry Susumu Shiroka and Kazuhiko Samejima [Non-Patent Document 2] Nagano Prefecture: Larch forest and tar [Non-Patent Document 3] Miyazaki Prefecture 2-1-1 Research on effective chemical use of cedar components [Non-Patent Document 4] Kita Lumber Yoshino Hinoki Essential Oil and Tree Sap Water [Non-Patent Document 5] Understand the characteristics of wood drying and choose the optimal drying method [Non-Patent Document 6] The Face of Trees, Japan Wood Research Society, Extractives and Wood Utilization Research Group (March 31, 2002) Summary of the Invention [Problem to be solved by the invention]

[0007] Wood drying differs greatly from general drying in that wood is dried in relatively high temperature steam. The steam discharged from the steam-heated drying kiln already contains the essential oils in the wood. For this reason, the present invention provides an apparatus that extracts both the essential oils from the exhaust steam and the essential oils from the biomass fuel used as fuel, eliminating 100% waste, and furthermore, makes it possible to reuse the biomass fuel as it is after the essential oil recovery as side fuel. The biomass fuel used as the fuel is mainly cypress lumber sawings, cypress bark, thin wood, chips, and other wood waste. [Means for solving the problem]

[0008] The main technical configuration of the present invention for satisfying the above-mentioned problems is as follows (1). (1) is an essential oil recovery device for recovering thick essential oil from exhaust steam from a wood steam drying kettle 100 filled with wood (13) (lumber) and thin essential oil at the bottom of the kettle, The essential oil recovery device is composed of a first essential oil recovery device (200) which is installed at the bottom of the wood steam drying pot (100) and recovers essential oil from the exhaust steam from the steam suction exhaust pipe (14), and a second essential oil recovery device (300) which recovers essential oil from the thin essential oil accumulated at the bottom of the wood steam drying pot (100) and wood chips (308) such as untreated cypress bark, sawed cypress lumber, and thinned lumber. The first essential oil recovery device (201) is connected to the inlet side of the essential oil recovery drum (204) via an exhaust fan (201) to the steam exhaust pipe (14), and the essential oil recovery drum (204) has a plurality of ferromagnetic magnet arrays (207) arranged with alternating N and S poles on holding projection beams (206) arranged radially in the pipe diameter direction and in the pipe longitudinal direction inside the essential oil recovery drum (204), and between the holding projection beams (204) are arranged catalyst projection beams (208) sprayed or plated with aluminum metaphosphate Al(PO3)3, radially in the pipe diameter direction and extending in the pipe longitudinal direction, The second essential oil recovery device (300) has a vertical, divided recovery tower (305), which is connected to a bottom-most cylinder (306) and a top-most cylinder (307) with a number of intermediate cylinders (308, 309, 310) detachably connected therebetween, and the bottom-most cylinder (306) and the top-most cylinder (307) are provided with ferromagnetic magnets (300F) arranged therein to generate electromagnetic waves for promoting the action of essential oils. The recovery tower (305) is characterized in that each tube is filled with wood waste such as unprocessed cypress bark, sawn cypress lumber, and thinned cypress material in a replaceable manner, and thin essential oil accumulated in the bottom of the wood steam drying tank (100) is introduced into the recovery tower (305) to recover thick essential oil. Effect of the Invention

[0009] In the present invention, by using the first essential oil recovery device (201) and the second essential oil recovery device (301), almost all of the active ingredient liquid such as essential oil, tar, alcohols (polysaccharides) in the aromatic distilled water at 70 to 140°C in the steam exhausted from the wood steam drying pot is recovered, and the essential oil and alcohols (polysaccharides) are supplied to places of human activity, and the tar is supplied as fuel, making it possible to utilize 100% of 50 to 70 year old wood. With the technical configuration characterized by the above-mentioned, this invention makes it possible to convert the exhaust steam from a steam drying tank into a liquid gas (water vapor) using the magnetic excitation vibration force of a ferrite magnet with a high Curie point of 470°C, and by combining this with the multi-stage compression method, it is possible to recover concentrated essential oils. In other words, it is possible to recover 100% of both the essential oils in the exhaust steam and the essential oils in the biomass fuel used as fuel with no waste, and what's more, the biomass fuel after essential oil recovery can be reused as fuel for boilers, etc. As a modified example of the present invention, the first and second essential oil recovery devices may be provided with a bifurcated valve for the first and second sides after the exhaust fan (201) of the steam exhaust pipe (14), and the exhaust steam from the wood steam drying pot may be introduced alternately or simultaneously into the first and second sides by switching the valve. For example, when the second essential oil recovery device (301) is refilling and replacing biomass fuel, the supply of exhaust steam to the second essential oil recovery device (301) may be temporarily stopped, and the exhaust steam may be supplied only to the first essential oil recovery device (201). When a large amount of lumber is charged into the wood steam drying pot and a large amount of steam is blown in to increase productivity, it is possible to supply exhaust steam to both the first essential oil recovery device (201) and the second essential oil recovery device (301) simultaneously.

[0010] The details of the effects of the present invention are as follows. The present invention is concerned solely with the processing of the bottom water (similar to thin refined oil) and exhaust steam from the steam drying kiln, but the procedure for steam drying the cypress in the preceding steam drying kiln is a variety of well-known methods determined by the lumber manufacturer and is not particularly limited. The exhaust steam from the steam drying pot that is the subject of this invention is preferably steam that has a heat content of 539 kcal per gram. This heat content can be controlled only on the intake side of the exhaust steam. For example, this control can be performed by measuring 70°C to 140°C with an infrared temperature sensor, and the exhaust steam temperature can be automatically adjusted to within this range by controlling the intake side exhaust fan volume (changing the rotation speed). In other words, the temperature on the drying pot side cannot be lowered too much. High temperature steam is supplied from the top of the ultra-high temperature drying tank and forcibly circulated through radiant tubes inside the room. For this reason, the exhaust steam pressure and temperature affect the recovery of essential oils, and 1 gram of steam releases 539 kcal of heat, which is equivalent to 100°C water, but apart from the essential oils, the heating time for pillars and planks is long, from 3 to 6 days, so the components also change.

[0011] The rich essential oil of cypress, recovered from the exhaust steam of the steam drying tank and from the bottom water (close to a thin essential oil), is the scent of forest bathing. Cypress baths are enjoyed by the whole body, and because they contain a good mixture of monoperylene and sesquiperylene oils, they have a refreshing and relaxing effect at the same time, making them great for relieving fatigue and stress. They also have a strong stimulating effect, so they are also effective against poor circulation. They also have a bactericidal effect, so they are useful for repelling mites and other insects. The main components of the concentrated essential oil bath are Ecklonia 1.4diene: 22%, α-pinene: 20%, and α-katsuol: the remainder. Traditionally, fertilizer was 100% local, but it is made from the leaves of the top part of cypress trees. It is very expensive. Amazon - 10ml is very expensive, costing 1,980 to 2,200 yen. This invention is a device that recovers essential oils from the exhaust steam of a wood steam drying kiln, which has been almost entirely released into the atmosphere in the past. In other words, the exhaust steam already contains a large amount of essential oils. Furthermore, essential oils remain in biomass fuels such as cypress bark, sawn cypress lumber, thinned wood (diameter 10 mm or less), and chips. Conventionally, these were fuels for dry steam, but the refined oil contained in the fuel is also recovered at the same time, and the recovered biomass fuel is used again as fuel for boilers, etc. This allows a large amount of refined oil to be recovered, and the cost of refining oil recovery is greatly reduced. As an example of the use of cypress oil, if it is sprayed into a hospital room together with ozone, 0.01 to 0.05 mmg / L (O3) + cypress oil (10cc per 1000cc of water) will turn the room into a forest bathing experience, kill MRA (resistant bacteria), and calm and invigorate the minds of hospitalized patients, providing excellent effects such as being inexpensive, providing a calming effect, and having a nerve tonic effect. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic overall explanatory diagram of an embodiment of the device of the present invention. [Diagram 2] FIG. 2 is an explanatory cross-sectional view taken along line AA in FIG. [Diagram 3] 2 is an explanatory diagram showing the structure of the openable / closable perforated plate section of the separable section of each tower of the recovery tower 305 of the second essential oil recovery apparatus 301 shown in FIG. [Figure 4] Diagram showing the chemical structure of wood lignin [Diagram 5] A diagram showing an example of the aromatic nucleus structure in the basic aromatic skeleton of cypress essential oil. [Figure 6] Diagram showing the structure of a compound with a C6-C3-C3-C6 skeleton DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] In FIG. 1, the apparatus of this example comprises a first essential oil recovery device 200 which recovers essential oil from the intake and exhaust steam from the steam suction exhaust pipe 101 at the bottom of a wood steam drying pot 100 filled with wood, and a second essential oil recovery device 300 which is filled with wood chips and into which thin essential oil collected at the bottom of the wood steam drying pot 100 is introduced to produce thick essential oil.

[0014] The steam drying pot 100 for wood is connected at the top with a steam supply pipe 11 for a boiler 10, and high-temperature steam from the steam supply pipe 11 is supplied to a radiant tube 12 arranged inside the pot, where the steam is blown out and introduced into the pot, thoroughly steam-drying the lumber 13 packed inside the pot. The steam used to steam-dry the wood 14 inside the pot is exhausted from a steam suction exhaust pipe 14 at the bottom of the pot. Therefore, the steam temperature in the wood steam drying kiln 100 is higher on the steam supply pipe 11 side (140° C.) than on the suction exhaust pipe 14 side (100° C.).

[0015] In the first essential oil recovery device 200, the steam suction exhaust pipe 14 is connected to an ejector 202 on the inlet side of an essential oil recovery drum 204 via an exhaust fan 201 (syrup fan), and the essential oil is refined in the essential oil recovery drum 204 and collected in a reservoir 210 from a collection pipe 205 connected to the lower bottom of the essential oil recovery drum 204. Meanwhile, the steam after essential oil recovery is released into the atmosphere from a discharge pipe 203 on the outlet side of the drum. The essential oil recovery drum 204 is internally composed of a row of ferromagnets 207 (each 700-800 G) with alternating magnetic poles arranged on the support protrusion beams 206 arranged radially in the longitudinal direction of the tube as shown in Fig. 2, and catalyst protrusion beams 208 of aluminum metaphosphate Al(PO3)3 sprayed or plated arranged between the support protrusion beams 206, and quickly liquefies steam in electromagnetic waves and captures essential oil. With this configuration, concentrated essential oil is reliably recovered from the essential oil-containing drying exhaust steam from the suction steam exhaust pipe 14 of the wood steam drying pot 100. The first essential oil recovery device 200 mainly uses a ferromagnet 207 with a high Curie point of 470°C, and the excitation effect of this magnet, together with the aluminum metaphosphate Al(PO3)3 catalyst of the catalyst protrusion beam 208, enables the recovered steam to be converted into a liquid of essential oil and water in a short period of time while at the same time removing tar.

[0016] The second essential oil recovery device 300 mainly comprises a vertical, five-section multi-stage recovery tower 305 which receives steam from the wood steam drying tank 100 and thin essential oil in the main reservoir 301 at the bottom via a piping duct 302 and a suction pump 303. The five-section recovery tower 305 is composed of a bottommost cylinder 306 and a topmost cylinder 307 in which ferromagnets 300F are arranged to generate electromagnetic waves inside to promote the essential oil action, and intermediate cylinders 308, 309, and 310 connected between the bottommost cylinder 306 and the topmost cylinder 307 in a separable manner using a gasket PK and a V-band clamp CR. The diluted essential oil collected at various places in the bottom of the wood steam drying kiln 100 is received from a drainage basin 321 via a drain pipe 320 and stored therein, and is temporarily stored in a storage tank 324 by a pump 323 via a collection pipe 322. The stored diluted essential oil is distributed and supplied from the storage tank 324 to each of the intermediate cylinders 308, 309, 310. Concentrated essential oil from the storage section 210 may also be introduced into the storage tank 324 . The middle cylinders 308, 309, and 310 of the five-section recovery tower 305 are filled with waste wood 330 such as untreated cypress bark, sawn cypress lumber, and thinned wood, and the essential oil extracted from the waste wood, the thin essential oil from the wood steam drying pot 100 301, and the thick essential oil from the storage tank 324 are extracted, refined, and recovered together. In the second essential oil recovery device 300, the ferromagnets 300F arranged in the lowest stage cylinder 306 and the highest stage cylinder 307 have a higher excitation effect and Curie point of 470°C as in the previous example, and 300 to 500 magnets of 700 to 800G each are arranged in each cylinder, making it possible to turn the water vapor into a liquid of essential oil and water in a short time and to remove tar. The essential oil in the recovery tower 305 accumulates and is recovered in the lower part of the lowest stage cylinder 306. The wood packed inside, from which essential oil has been extracted by the heat treatment, is separated by removing the clamps KR from the intermediate tubes 308, 309, and 310 of the five-section recovery tower 305, and the openable perforated sections at the bottom of each of the separated intermediate tubes are opened to receive the lumber inside, and the wood is collected into a container and reused as fuel for the steam boiler 10 for the wood steam drying kiln 100, etc. The open-close type screen section has ventilation and liquid holes, and consists of two double-hinged doors 311 and 312 that swing down at an angle under their own weight, as shown in Figure 3. When a partition pin 313 located at the overlapping ends in the center is removed, the doors 311 and 312 open naturally at 90 degrees to the left and right, allowing the waste wood stored inside to be discharged and replaced. The exhaust steam that has passed through the topmost cylinder 307 is sent from reducer 314 to duct 315 and then to reducer 316 in a counterflow water-cooled cooling tower 317 (or an air-cooled tower with a fan) where it is separated from the air and liquefied. Essential oils remain in the liquefied product, and as a result, it is possible to recover almost 100% of the essential oils.

[0017] As for the preferred specifications of the second essential oil recovery device 301, the lowest cylinder 306 and the highest cylinder 307 are made of ferromagnetic material by plating Ni-P (casein) on iron, and 35 ferrite magnets 600F (700 x 500 mm) are installed inside to form a strong magnetic field, where an electric current is generated according to Fleming's law. If a catalyst is used, essential oil can be recovered more quickly even in the heated steam that flows due to this electric current. The catalyst is aluminum metaphosphate Al(PO3)3: sprayed or plated with a molecular weight of 263.9. The base material is SS400 steel pipe with Kanigen plating (SS+NI-P plating) Al punching, and the base material is a punched metal sprayed or plated with inexpensive Al(PO3)3 powder to speed up the reaction in steam, making it possible to recover more than 90% of the essential oil in the biofuel wood filled in. This is because the separation of cypress oil and essential oil in the exhaust steam from the wood steam drying kiln 100 is promoted by the potential difference from (+) to (-). Incidentally, since Al(PO3)3 is used as the raw material for Al2O3, Al2O3 ceramics also have excellent hardness, heat resistance, corrosion resistance, and thermal conductivity. This is the same effect as the so-called anodizing process, which creates Al(PO3)3 in H2PO3 on aluminum punching metal.

[0018] The aluminum metaphosphate Al(PO3)3 of the sprayed catalyst projection beam 208 in the first essential oil recovery device 200 is a catalyst for aromatic hydrocarbons from the lignin in the center of wood, and by using it as a powder spray or plating, expensive platinum catalysts such as Pt, Rd, Pd, and In are no longer necessary. This new knowledge was introduced in a paper from the University of Tokyo. In other words, aluminum metaphosphate Al(PO3)3 is a cellulose (C6H 10 It acts as a catalyst by reacting with the hydrogen in carbohydrates (C5H7O5) and lignin (C5H7O3) to change the arrangement of CHO in carbohydrates in various ways. Rather than ionization, it is plated or sprayed onto iron (95%) + Al punched metal, and in the electromagnetic waves, the magnetic excitation effect of the ferrite magnet quickly liquefies the steam and recovers the essential oil.

[0019] Aluminum metaphosphate Al(PO3)3 is also effective in the anodizing process. The pretreatment involves degreasing, (water washing), neutralization (water washing), and creating Al2O3 on the surface of aluminum using sulfuric acid or oxalic acid. By changing the final H2SO4 to phosphoric acid H3PO3, Al+3H3PO3→Al(PO3)+3H + +3e - It is easy to make. When directly powder spraying or plating Al(PO3)3, heat is generated, so distortion occurs in punched flat aluminum plates, causing bending. Chemical plating is used to make aluminum metaphosphate in phosphoric acid (H2PO3) instead of sulfuric acid (H2SO4). When exhaust steam passes through Al(PO3) punching metal (Al), the chemical structure of lignin (see Figure 4) becomes very complex, and there is no single bond pattern. Various chemical structures of lignin that are easy to act as aluminum metaphosphate catalyst are produced and collected.

[0020] The three aromatic core structures in the basic aromatic skeleton of cypress essential oil are p-hydroxyphenyl and guaiacyl tosyringyl, as shown in Figure 5. Lignin is a carbohydrate complex, so the steam passing through a strong magnetic field quickly extracts the essential oils in the biomass fuel as electrolytic steam, and H2O↑→H2O is formed, and the essential oils dissolve in the H2O. The catalyst used in this process is Al(PO3)3.

[0021] The dry exhaust steam contains carbohydrates (carbohydrates-C 11 H 20 O 11 The carbohydrates extracted from wood are monosaccharides, oligosaccharides, and polysaccharides, and the other carbohydrates extracted from the sapwood are D-glucose, fructose, sucrose, starch, amylose (20-25%), a linear component with α1-4 bonds, and amylopectin (75-81%), a branched water structure with α1-6 bonds. Because these sugars remain in the material that is separated due to the difference in specific gravity, when used in mushroom cultivation using wood as a culture substrate, it has a significant effect on the growth of the mycelium of various mushrooms, and it has many uses other than as an essential oil.

[0022] Lignans are easily confused with lignin, but they are a group of compounds that have a C6-C3-C3-C6 skeleton in which two molecules of phenylpropane (C6-C3), the structural unit of lignin, are bonded between the beta carbon atoms of the side chains. They are generally polysaccharides. Dissolved in the exhaust steam is guaiaretic acid (C 20 H 24 O4), Hinokinin (C 20 H 18 O6), Vinoresinol (C 20 H 22 The melting point varies depending on the balance of C, H, and O. When water vapor passes through the magnetic field of a ferrite magnet, free hydrogen H + e - The more H there is, the lower the melting point will be due to the potential difference. The difference in melting point is molecular weight: 328~358 is low (226~250±2), but a molecular weight of 320~360 is ideal. Compounds a, b, c, d, e, and f shown in Reference Figure 6 are compounds with a C6-C3-C3-C6 skeleton. Lignans are lignin structural units.

[0023] Lignin is one of the components of plant cell walls, and is a polymeric phenolic compound formed by the polymerization of aromatic monomers. The name means "wood" in Latin. Its chemical structure is a phenol-propane carbon skeleton with three carbons attached to a benzene ring, and many of these are bonded to each other in a dendritic structure between side chains and between benzene rings and side chains, making it a polymer with a molecular weight of 5% or more, and therefore insoluble in many solvents. For this reason, paper manufacturers treat pulp with sulfurous acid to solubilize and remove the lignin. It is difficult to simply recover essential oils by cooling exhaust steam, so this invention utilizes catalysts and magnetic force. The essential oils contained in cellulose and lignin can only be extracted by heated steam, but the recovery rate is about 0.001 to 0.003% of the total weight. 1 kettle 40m 3 Assuming this, the recovery amount will be about 16kg to 48kg (2-3% of the water quality, 320cc to 960cc). It will become clear that the price of 2000 yen for 10ml sold on Amazon is expensive. Since we have not yet experienced how to recover large quantities at a low cost, we must conduct experiments and make decisions.

[0024] Water, air, and everything else in the world circulates, but the extremely long-term conservation of resources, in which trees are planted after lumber is cut and passed on to the next generation, serves the function of preserving the land. Therefore, in this invention, the exhaust steam from the steam drying kiln not only emits essential oils, but also greenhouse gases such as methane gas (C2H4) and many sugars, so by recovering these without wasting a single drop, we can achieve "carbon neutrality." [Industrial Applicability]

[0025] The present invention exhibits the above-mentioned excellent effects and will make a great contribution to the forestry industry, fragrance industry, etc. Furthermore, through these industries, it will make a great contribution to the "carbon neutral" goal of the world. [Explanation of symbols]

[0026] 10: Boiler 11: Steam supply pipe 12: Radiant tube 13:Wood 14: Steam suction exhaust pipe 100: Wood steam drying kiln 200: First essential oil recovery device 201: Suction and exhaust fan 204: Essential oil collection drum 206: Holding protrusion beam 207: Ferromagnetic 208: Catalyst protrusion beam 300: Second oil recovery device 301: Duct 302: Suction pump 305:5 split recovery tower 300F: Ferromagnetic 306: Bottom tube 307: Top barrel PK: Packing CR: V-band clamp 308, 309, 310: Intermediate tube 311 and 312: Openable and closable double doors with self-weighting mesh 314: Reducer 315: Duct 316: Reducer 317: Counterflow water-cooled cooling tower 308: Wood waste, such as wood chips 320: Collection piping 321: Pump 322: Tank

Claims

[Claim 1] An essential oil recovery device for recovering thick essential oil from exhaust steam from a wood steam drying kettle 100 filled with wood (13) (lumber) such as boards and logs and / or from thin essential oil from a bottom reservoir of the kettle, The essential oil recovery device comprises a first essential oil recovery device (200) which is installed at the bottom of the wood steam drying pot (100) and recovers essential oil from exhaust steam from the steam suction exhaust pipe (14), and a second essential oil recovery device (300) which recovers essential oil from thin essential oil accumulated at the bottom of the wood steam drying pot (100) and wood chips (308) such as untreated cypress bark, sawed cypress lumber, and thinned lumber. The first essential oil recovery device (201) is connected to the inlet side of an essential oil recovery drum (204) via an exhaust fan (201) to the steam exhaust pipe (14). The essential oil recovery drum (204) has a plurality of ferromagnetic magnet arrays (207) arranged with alternating N and S poles on holding protruding beams (206) arranged radially in the pipe diameter direction and in the pipe longitudinal direction inside the drum (204). Aluminum metaphosphate Al(PO 3 ) 3 A catalyst projection beam (208) having a thermal spraying or plating thereon is arranged, The second essential oil recovery device (300) has a vertical, divided recovery tower (305), which is connected to a bottom-most cylinder (306) and a top-most cylinder (307) with a plurality of intermediate cylinders (308, 309, 310) detachably connected therebetween, and the bottom-most cylinder (306) and the top-most cylinder (307) are provided with ferromagnetic magnets (300F) arranged therein for generating electromagnetic waves to promote the action of essential oil. The recovery tower (305) is characterized in that each tube is filled with wood waste such as untreated cypress bark, sawn cypress lumber, and thinned cypress wood, and the like, in an exchangeable manner, and thin essential oil accumulated in the bottom of the wood steam drying pot (100) is introduced therein to recover thick essential oil, thereby recovering the thick essential oil from the cypress cycle biofuel.

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