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WO2022153830A1 - Procédé de fabrication de combustible solide à base de biomasse - Google Patents

Procédé de fabrication de combustible solide à base de biomasse Download PDF

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Publication number
WO2022153830A1
WO2022153830A1 PCT/JP2021/047925 JP2021047925W WO2022153830A1 WO 2022153830 A1 WO2022153830 A1 WO 2022153830A1 JP 2021047925 W JP2021047925 W JP 2021047925W WO 2022153830 A1 WO2022153830 A1 WO 2022153830A1
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Prior art keywords
biomass
solid fuel
producing
pellets
less
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PCT/JP2021/047925
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English (en)
Japanese (ja)
Inventor
拓也 古園
直毅 河本
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出光興産株式会社
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Priority to JP2022575505A priority Critical patent/JPWO2022153830A1/ja
Publication of WO2022153830A1 publication Critical patent/WO2022153830A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/40—Solid fuels essentially based on materials of non-mineral origin
    • C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances

Definitions

  • the present invention relates to a method for producing a biomass solid fuel.
  • Coal-fired power has a large amount of CO 2 emissions per emission intensity and has a high environmental load.
  • biomass co-firing in which coal is mixed with biomass and burned, is drawing attention.
  • Co-firing of wood chips and wood pellets has already been carried out, but since biomass is less pulverizable than coal, the maximum co-firing rate of biomass is only about several percent.
  • Patent Document 1 a woody biomass pulverized product having a size of 5 to 60 mm is densified to 0.5 g / cm 3 or more in bulk density (measured according to 6 “bulk density test method” of JIS K2151). Subsequently, a method for producing a solid fuel, which is characterized by roasting under conditions of an oxygen concentration of 10% or less and a temperature of 170 to 350 ° C., is disclosed.
  • Patent Document 2 the fuel ratio (fixed carbon / volatile matter) is 0.2 to 0.8, the high calorific value of the anhydrous base is 4800 to 7000 (kcal / kg), and the molar ratio O of oxygen O and carbon C is O.
  • a solid biomass fuel obtained by molding a biomass powder having a / C of 0.1 to 0.7 and a molar ratio of hydrogen H to carbon C of 0.8 to 1.3 is disclosed. ..
  • Patent Document 3 describes a method for producing fuel pellets, in which a step of introducing lignocellulosic biomass having a water content of less than about 30% by weight into a reactor and a step of putting the reactor in a vacuum state are described.
  • a step of injecting steam into the reactor having a temperature between about 180 ° C. and about 235 ° C., a step of maintaining the biomass in the reactor for about 1 to about 12 minutes, and the treated A method comprising the step of removing biomass from the reactor is disclosed.
  • solid fuel having improved pulverizability and co-firing rate with coal can be obtained by semi-carbonizing the biomass or steam blasting the biomass. Further, the methods described in Patent Documents 1 to 3 are applicable because a hydrophobic solid fuel (hereinafter, may be referred to as "black pellet”) can be obtained by semi-carbonizing or steam blasting the biomass.
  • Black pellet a hydrophobic solid fuel
  • Solid fuel can be stored outdoors. However, when black pellets are stored outdoors, there is concern about the elution of organic components (chemical oxygen demand (COD)). Coal has almost no elution of organic components, but black pellets elute organic components, so there is concern about the impact on the environment when stored outdoors.
  • An object of the present invention is to provide a method for producing a biomass solid fuel in which COD elution is reduced from biomass obtained through steam blasting treatment.
  • a step of steam-blasting biomass to obtain blasted biomass a step of molding the blasted biomass to obtain biomass pellets, and heating the biomass pellets at 180 ° C. or higher for 5 minutes or longer.
  • a method for producing a biomass solid fuel having a pellet heating step and a method for producing a biomass solid fuel is provided.
  • the method for producing a biomass solid fuel it is preferable to have a first drying step of drying the biomass before the step of obtaining the crushed biomass.
  • the steam blasting is preferably carried out in a closed container under saturated steam of 100 ° C. or higher and 300 ° C. or lower and 0.1 MPa or higher and 9.0 MPa or lower.
  • the pellet heating step heats the biomass pellets at an oxygen concentration of 5% by mass or less and at least 5 minutes and 60 minutes or less.
  • the COD of the biomass pellet after the pellet heating step is 1/6 of the COD of the biomass pellet before the pellet heating step is performed. It is preferable to carry out the pellet heating step as follows.
  • the biomass is preferably at least one selected from the group consisting of woody biomass, herbaceous biomass, crop residue biomass, and palm palm biomass. ..
  • the numerical range represented by using “-” means a range including a numerical value before “-” as a lower limit value and a numerical value after "-" as an upper limit value. do.
  • the method for producing a biomass solid fuel according to the present embodiment includes a step of steam-blasting the biomass to obtain crushed biomass and molding the crushed biomass to obtain biomass. It has a step of obtaining pellets and a pellet heating step of heating the biomass pellets at 180 ° C. or higher for 5 minutes or longer.
  • the biomass solid fuel obtained by the production method of the present embodiment is a pellet heating step in which biomass pellets are molded using steam-blasted biomass (explosed biomass) and then the biomass pellets are heated at 180 ° C. or higher for 5 minutes or longer. It is obtained by carrying out. In the biomass solid fuel thus obtained, the elution of COD is significantly reduced as compared with the biomass solid fuel in which the pellet heating step is not performed.
  • the biomass solid fuel obtained by the production method of the present embodiment can be stored outdoors because it is stored outdoors and does not easily disintegrate even when it gets wet with water, and the elution of COD is reduced. Therefore, it is expected that equipment such as silos will not be required. Above all, since the biomass solid fuel such as wood pellets easily disintegrates when it gets wet with water, it is useful to produce the biomass solid fuel in which the elution of COD is reduced by the production method of the present embodiment. Further, the biomass solid fuel obtained by the production method of the present embodiment secures the characteristics required for the fuel (for example, HGI, high calorific value, bulk density, and mechanical durability) as shown in Examples described later. Has been done. By producing the biomass solid fuel by the production method of the present embodiment, the use of the biomass solid fuel can be expanded.
  • characteristics required for the fuel for example, HGI, high calorific value, bulk density, and mechanical durability
  • biomass The biomass is not particularly limited, and examples thereof include woody biomass, herbaceous biomass, crop residue biomass, palm palm biomass, cellulosic products, and pulp products.
  • the crop residue biomass means something other than the edible portion.
  • palm palm biomass means agricultural waste of palm palm that can be used as a biomass fuel.
  • Specific examples of the palm palm biomass include palm palm shell (PKS: Palm Kernel Shell), palm palm fruit bunch (EFB), palm trunk (Palm Trunk), and the like.
  • PPS Palm Kernel Shell
  • EFB palm palm fruit bunch
  • Palm Trunk palm trunk
  • the biomass is preferably at least one selected from the group consisting of woody biomass, herbaceous biomass, crop residue biomass, and palm palm biomass.
  • woody biomass examples include conifers (eg, sugi, pine, eucalyptus, cypress, and fir) and hardwoods (eg, birch, beech, zelkova, katsura, kiri, rubber tree, and kusunoki). Can be mentioned.
  • the woody biomass may be construction waste (for example, cut offcuts, chips generated at a processing plant, sawdust, etc.), forest residue, thinned wood, bamboo, and the like.
  • Examples of herbaceous biomass include grasses, naturally grown plants, and artificially planted plants.
  • the herbaceous biomass may be hemp, cotton, rice straw, rice husk, straw, bamboo grass, napier grass, sorghum, pampas grass and the like.
  • crop residue biomass examples include leaves, fruit bunches, stems, roots, and other non-edible parts of crops.
  • Examples of the crop include wheat, corn, potatoes, sugar cane (including bagasse), bananas and the like.
  • palm palm biomass examples include palm oil pomace (PKS), fruit bunch (EFB), and fruit bark.
  • PPS palm oil pomace
  • EFB fruit bunch
  • the biomass described above may be used alone or in combination of two or more.
  • the step of obtaining the blasted biomass is a step of obtaining the blasted biomass by steam blasting the biomass.
  • Steam blasting is the structure of biomass by steaming biomass in a closed container such as a pressure-resistant container with saturated steam at high temperature and high pressure for a short time, then rapidly releasing it to atmospheric pressure, cooling it rapidly, and adiabatic expansion. In the case of wood, it refers to the process of destroying the wood structure).
  • the shape of the biomass used for steam blasting is not particularly limited. Examples of the shape of the biomass include the shape of the biomass itself (for example, palm palm empty fruit bunch, etc.), chip shape, long shape, powder shape, indefinite shape, and the like.
  • the biomass used for steam blasting may be the biomass in the obtained state, or the biomass after crushing the obtained biomass into an arbitrary shape and size. For example, palm palm empty fruit bunch and the like can be used as they are obtained.
  • Biomass is crushed and semi-carbonized by steam blasting. For example, when the biomass is chip-shaped biomass (biomass chips), the biomass chips are crushed by steam blasting into biomass powder.
  • the obtained biomass powder (blasted biomass) is in a semi-carbonized state.
  • the temperature of steam blasting is preferably 100 ° C. or higher and 300 ° C. or lower, more preferably 100 ° C. or higher and 280 ° C. or lower.
  • the pressure of steam blasting is preferably 0.1 MPa or more and 9.0 MPa or less, and more preferably 1.0 MPa or more and 6.5 MPa or less.
  • the steam blasting time is preferably 10 minutes or more and 60 minutes or less, and more preferably 15 minutes or more and 30 minutes or less.
  • the steam blasting is preferably carried out in a closed container under saturated steam of 100 ° C. or higher and 300 ° C. or lower, 0.1 MPa or higher and 9.0 MPa or lower, and 100 ° C. or higher and 280 ° C. or lower. More preferably, it is carried out under saturated steam of 1.0 MPa or more and 6.5 MPa or less.
  • the size of the biomass obtained in the process of obtaining the blasted biomass varies depending on the size and shape of the biomass used for steam blasting.
  • the major axis diameter of the biomass powder obtained in the step of obtaining the blasted biomass is preferably 1000 ⁇ m or less, more preferably 500 ⁇ m or less.
  • the major axis diameter is the maximum diameter.
  • the major axis diameter of the biomass powder means the maximum length of a straight line when any two points on the outer contour line of the biomass powder are connected by a straight line.
  • the step of obtaining biomass pellets is a step of molding the blasted biomass to obtain biomass pellets.
  • pellets include briquettes.
  • the size and shape of the pellets are not particularly limited, but the pellets are usually cylindrical, preferably 5 mm or more and 10 mm or less in diameter, and 5 mm or more and 50 mm or less in length.
  • the biomass pellet can be produced by extruding the crushed biomass obtained by steam blasting from a metal hole (for example, a diameter of 5 mm or more and 10 mm or less and a length of 5 mm or more and 50 mm or less).
  • biomass pellets can be produced by using, for example, a pelletizer such as a ring die method or a flat die method.
  • Biomass pellets can also be produced, for example, by molding into a charcoal-like or cylindrical shape using a briquette machine.
  • the pellet heating step is a step of heating the biomass pellets at 180 ° C. or higher for 5 minutes or longer.
  • the pellet heating step from the viewpoint of insolubilizing the eluted components, it is preferable to heat the biomass pellets at 190 ° C. or higher for 5 minutes or longer, more preferably at 200 ° C. or higher for 5 minutes or longer, and at 205 ° C. or higher for 5 minutes or longer. It is more preferable to heat above, and it is further preferable to heat at 210 ° C. or higher for 5 minutes or longer.
  • the upper limit temperature in the pellet heating process is less from the viewpoint of ensuring a good balance of the characteristics required for fuel (for example, HGI, high calorific value, bulk density, and mechanical durability) while reducing COD elution. From the viewpoint of reducing the elution of COD with energy, it is preferably not too high, specifically, 270 ° C. or lower, more preferably 265 ° C. or lower, and 260 ° C. or lower. More preferred.
  • the time (heating time) for heating the biomass pellet at 180 ° C. or higher is preferably 240 minutes or less, more preferably 120 minutes or less, still more preferably 60, from the viewpoint of reducing the elution of COD in a short time.
  • the heating time of the biomass pellet means the total time of the time from 180 ° C. to reach the target temperature and the holding time at the target temperature. For example, when the biomass pellet is heated from room temperature (25 ° C.) to 230 ° C. (target temperature) at a heating rate of 5 ° C./min and held at 230 ° C. for 0 minutes, the heating time of the biomass pellet is from 180 ° C. The time required to reach 230 ° C. (10 minutes) and the holding time at 230 ° C. (0 minutes) are added up to calculate 10 minutes.
  • the target temperature may be referred to as the ultimate temperature.
  • the pellet heating step it is preferable to heat to a target temperature at a heating rate of 3 ° C./min or more and 60 ° C./min or less (preferably 3 ° C./min or more and 30 ° C./min or less).
  • the target temperature (reached temperature) is preferably 270 ° C. or lower, more preferably 265 ° C. or lower, and even more preferably 260 ° C. or lower.
  • the atmosphere in the pellet heating step is preferably a low oxygen concentration, specifically, an oxygen concentration of 5% by mass or less, and more preferably an oxygen concentration of 3% by mass or less.
  • Examples of the low oxygen concentration atmosphere in the pellet heating step include an inert gas atmosphere.
  • Examples of the inert gas atmosphere include at least one inert gas atmosphere selected from nitrogen gas, argon gas, carbon dioxide gas, and combustion exhaust gas.
  • the biomass pellet is preferably heated at an oxygen concentration of 5% by mass or less and the biomass pellet is heated at 5 minutes or more and 60 minutes or less, and the biomass pellet is heated at an oxygen concentration of 5% by mass or less and at 5 minutes or more and 50 minutes or less. Is more preferable, and it is more preferable to heat the biomass pellets at an oxygen concentration of 3% by mass or less and for 5 minutes or more and 50 minutes or less.
  • the pellet heating step is carried out so that the COD of the biomass pellets after the pellet heating step is 1/6 or less of the COD of the biomass pellets before the pellet heating step is carried out. It is more preferable to do so.
  • the COD of the biomass pellet after the step is carried out / the COD of the biomass pellet before the pellet heating step is carried out is preferably 1/6 or less, more preferably 1/8 or less, still more preferably 1/10 or less, and further. It is preferably 1/15 or less, more preferably 1/16 or less, still more preferably 1/18 or less, still more preferably 1/20 or less, still more preferably 1/25 or less, still more preferably 1/30 or less.
  • First crushing step In the production method of the present embodiment, it is preferable to have a first crushing step of crushing the biomass before the step of obtaining the crushed biomass.
  • a first crushing step of crushing the biomass As one mode of crushing in the first crushing step, there is a mode in which the obtained biomass is crushed into a shape (for example, a chip shape or a long shape) that can be easily introduced into a steam blasting apparatus.
  • the crushing method is not particularly limited, and the biomass can be crushed into chips, long shapes, or the like using a known crusher.
  • the size of the chip is not particularly limited, but for example, when woody biomass is crushed into chips, the major axis diameter is preferably 5.0 cm or less, more preferably 1.0 cm or less.
  • crushed crushing step In the production method of the present embodiment, it is also preferable to have a second crushing step of crushing the crushed biomass after the step of obtaining the blasted biomass.
  • One mode of crushing in the second crushing step is a mode in which the crushed biomass is further crushed when a relatively large size biomass (for example, a major axis diameter on the order of several tens of centimeters) is steam crushed.
  • the first drying step is a step of drying the biomass and adjusting the water content of the biomass.
  • the first drying step may be natural drying or heat drying.
  • the drying temperature and drying time of the biomass are appropriately selected depending on the biomass species and size. For example, the drying time of biomass is preferably 30 minutes or more.
  • the water content of the biomass obtained in the first drying step is preferably 10% by mass or more and 20% by mass or less, and more preferably 10% by mass or more and 15% by mass or less.
  • the second drying step is a step of adjusting the water content of the crushed biomass by drying the water adhering to the biomass by steam blasting.
  • the second drying step may be natural drying or heat drying.
  • the drying temperature and drying time of the blasted biomass are appropriately selected according to the biomass species and size of the blasted biomass. For example, the drying time of the blasted biomass is preferably 30 minutes or more.
  • the water content of the crushed biomass obtained in the second drying step is preferably 10% by mass or more and 20% by mass or less, and more preferably 10% by mass or more and 15% by mass or less.
  • the explosive biomass is dried so that the water content is 10% by mass or more and 20% by mass or less, so that the formability of the pellets is improved in the step of obtaining the biomass pellets.
  • the first drying step and the second drying step may be carried out together.
  • biomass pellets having more uniform properties can be obtained.
  • the production method of the present embodiment may include a washing step of washing the biomass.
  • the washing step is preferably carried out before the first drying step.
  • the alkali metal component adhering to the surface of the biomass is removed.
  • a known washing liquid such as water or hot water can be used.
  • the washing time and the number of washings are not particularly limited.
  • the production method of the present embodiment includes a step of obtaining crushed biomass, a step of obtaining biomass pellets, and a pellet heating step, and if necessary, a first crushing step, a second crushing step, and a first It may have at least one of a drying step, a second drying step and a washing step of the above.
  • the order of implementation of the production method of the present embodiment is not particularly limited, but it is preferable to carry out the method in the following order.
  • the biomass solid fuel obtained by the production method of the present embodiment may contain other components other than biomass as long as the effects of the present embodiment are not impaired.
  • the other components are not particularly limited, and examples thereof include binders and various additives.
  • the binder include lignin and acrylic acid amide.
  • the content of the binder in the biomass solid fuel is preferably 0% by mass or more and 50% by mass or less, and more preferably 0% by mass or more and 10% by mass or less.
  • the biomass solid fuel obtained by the production method of the present embodiment can be widely used in power plants, steelworks, factories and the like.
  • the biomass solid fuel of the present embodiment may be used by being burned alone, or may be mixed with other fuels such as coal and burned (co-firing).
  • the biomass solid fuel may be crushed by a crusher and introduced into a boiler, or may be introduced into a boiler as it is depending on the size. It is also preferable to use the biomass solid fuel mixed with coal.
  • the biomass solid fuel is crushed together with coal using an existing thermal power generation facility, for example, using a coal crusher, and these are boilers. May be introduced in.
  • the biomass solid fuel may be crushed by a crusher different from the coal crusher (for example, a crusher for biomass solid fuel), mixed with coal crushed separately, and introduced into the boiler.
  • the usage mode of the biomass solid fuel is not limited to the above.
  • the biomass solid fuel of the second embodiment is obtained by the method for producing a biomass solid fuel according to the first embodiment.
  • the biomass solid fuel of the second embodiment has a COD of 1,000 mg / L or less, a hardgrove grindability index (HGI) of 25 or more, a mechanical durability of 93% or more, and a high dry base.
  • the calorific value is 5,000 kcal / kg or more, and the bulk density is 680 kg / m 3 or more. According to the biomass solid fuel of the second embodiment, the elution of COD is reduced.
  • biomass solid fuel of the second embodiment from the viewpoint of reducing the elution of COD and ensuring a well-balanced characteristic required for the fuel, COD, HGI, mechanical durability, high calorific value of dry base, and bulk density.
  • the preferred range of is as follows.
  • the biomass solid fuel of the second embodiment has a COD of 1,000 mg / L or less.
  • the COD is preferably 400 mg / L or less, more preferably 200 mg / L or less.
  • the method for measuring COD is as described in the examples.
  • the biomass solid fuel of the second embodiment has an HGI of 25 or more.
  • the HGI is preferably 27.5 or more, more preferably 30 or more.
  • the method for measuring HGI is as described in Examples.
  • the biomass solid fuel of the second embodiment has a mechanical durability of 93% or more.
  • the mechanical durability is preferably 95% or more, more preferably 97% or more.
  • the method for measuring the mechanical durability is as described in the examples.
  • the biomass solid fuel of the second embodiment has a dry base high calorific value of 5,000 kcal / kg or more.
  • the high calorific value of the dry base is preferably 5,150 kcal / kg or more, more preferably 5,300 kcal / kg or more.
  • the method for measuring the high calorific value of the air-dry base is as described in the examples.
  • the biomass solid fuel of the second embodiment has a bulk density of 680 kg / m 3 or more.
  • the bulk density is preferably 700 kg / m 3 or more, more preferably 720 kg / m 3 or more.
  • the biomass solid fuel having a further reduced COD that is, the COD is 350 mg / L or less (preferably 200 mg / L or less), and the Hardgrove Grindability Index (HGI) is 25.
  • the biomass solid fuel having the above, the mechanical durability of 93% or more, the high calorific value of the dry base of 5,000 kcal / kg or more, and the bulk density of 680 kg / m 3 or more is, for example, the following aspects. It is manufactured by the manufacturing method of A.
  • the manufacturing method of the aspect A is one aspect of the manufacturing method of the first embodiment.
  • the manufacturing method of Aspect A is The process of steam-blasting biomass to obtain crushed biomass, The process of molding the crushed biomass to obtain biomass pellets, It has a pellet heating step of heating the biomass pellets under the conditions of 210 ° C. or higher (preferably 230 ° C. or higher) and 20 minutes or longer and 60 minutes or lower.
  • Table 1 shows the properties of the biomass used in the examples and comparative examples.
  • the industrial analysis values are values measured in accordance with JIS M8812 (2004). Of the elemental analysis values, carbon, hydrogen, nitrogen and sulfur are values measured in accordance with JIS M8819 (1997), and oxygen is a value calculated from other analysis values in accordance with JIS M8813 (2004). be.
  • the high calorific value is a value measured according to JIS M8814 (2003).
  • the fuel ratio is "fixed carbon / volatile matter”.
  • the calorific value of the dry base (DB) represents the calorific value in the dry state.
  • Ad is an abbreviation for Air Dry Basis, which represents an air-drying base and represents a state of being dried in the air.
  • “Daf” is an abbreviation for Dry Ash Free, and represents an anhydrous ash-free base, and represents a virtual state assuming that biomass does not contain water and ash. Obtained by conversion from the analyzed value.
  • Biomass woody type 1
  • Biomass woody type 1
  • the biomass chips were dried in a dryer so that the water content was 10% by mass or more and 12% by mass or less.
  • the dried biomass chips were placed in a pressure vessel. Steam was introduced into the pressure-resistant container, and the biomass chips were steamed (steam blasted) with saturated steam under the following conditions. Then, it was rapidly released to atmospheric pressure and cooled to obtain biomass powder.
  • Biomass powder was compression-molded using a compression molding apparatus to obtain cylindrical biomass pellets (diameter 8 mm, height 10 mm to 40 mm).
  • Example 1-2 to 1-4 and Comparative Examples 1-2 to 1-4 Examples 1-2 to 1-4 and Comparative Example 1 in the same manner as in Example 1-1 except that the ultimate temperature and holding time in the pellet heating step were changed to the reaching temperature and holding time shown in Table 2. -2 to 1-4 biomass solid fuels were obtained.
  • Comparative Example 1-1 The biomass solid fuel (unheated) of Comparative Example 1-1 was obtained in the same manner as in Example 1-1 except that the pellet heating step was not carried out.
  • Example 2-1 Provides to obtain biomass chips
  • Biomass woody type 2 was crushed with a crusher to obtain biomass chips. After that, the biomass solid fuel of Example 2-1 was obtained in the same manner as in Example 1-1.
  • Example 2-2 to 2-4 and Comparative Examples 2-2 to 2-4 Examples 2-2 to 2-4 and Comparative Example 2 in the same manner as in Example 2-1 except that the ultimate temperature and holding time in the pellet heating step were changed to the reaching temperature and holding time shown in Table 2. -2 to 2-4 biomass solid fuels were obtained.
  • Comparative Example 2-1 The biomass solid fuel (unheated) of Comparative Example 2-1 was obtained in the same manner as in Example 2-1 except that the pellet heating step was not carried out.
  • the immersion water used for COD measurement complies with the "Testing method for metals contained in industrial waste (Environmental Agency Notification No. 13 of 1973)" and is subjected to a 6-hour shaking test to prepare wastewater. Prepared by method.
  • the COD concentration in the prepared immersion water was measured with a simple COD meter (COD-60A) manufactured by Toa DKK Corporation.
  • the COD concentration in the black pellet immersion water was measured in advance by the official method (JIS K0102 (2016)), and the regression equation was obtained from the correlation with the measurement result by this apparatus. From the regression equation, the measured value converted to the specified measurement method was obtained. The results are shown in FIGS. 1 and 2. From FIG.
  • Example 1-1 (reaching temperature 190 ° C., holding time 30 minutes) in which the biomass pellets were heated at 180 ° C. or higher for 32 minutes
  • Comparative Example 1-4 (reaching temperature 190 ° C., holding time 30 minutes) in which the biomass pellets were heated at 180 ° C. or higher for 2 minutes
  • Example 1-4 (reaching temperature 230 ° C., holding time 0 minutes) in which the biomass pellets were heated at 180 ° C. or higher for 10 minutes
  • Example 1-3 (reaching temperature 230) in which the biomass pellets were heated at 180 ° C. or higher for 40 minutes.
  • Example 1-1 the elution of COD was further reduced as compared with Example 1-1. Similar results were obtained in the comparison between Example 2-1 (reaching temperature 190 ° C., holding time 30 minutes) and Comparative Example 2-4 (reaching temperature 190 ° C., holding time 0 minutes). Similar results were obtained in the comparison between Example 2-4 (reaching temperature 230 ° C., holding time 0 minutes) and Example 2-3 (reaching temperature 230 ° C., holding time 30 minutes) and Example 2-1. there were.
  • HGI Hardgrove Grindability Index
  • the biomass solid fuel obtained by the production method of the present invention can be stored outdoors in a power plant, a steel mill, a factory, etc. because the elution of COD is reduced.

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  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

Un procédé de fabrication de combustible solide à base de biomasse comprend : une étape d'obtention de biomasse nettoyée par projection de vapeur; une étape d'obtention de granulés de biomasse par moulage de ladite biomasse nettoyée ; et une étape de chauffage de granulés pour chauffer les granulés de biomasse à 180 °C ou plus pendant au moins 5 minutes.
PCT/JP2021/047925 2021-01-12 2021-12-23 Procédé de fabrication de combustible solide à base de biomasse WO2022153830A1 (fr)

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Citations (6)

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JP2005239907A (ja) * 2004-02-27 2005-09-08 Sumitomo Osaka Cement Co Ltd バイオマス半炭化燃料の製造方法及び装置
WO2006006863A1 (fr) * 2004-07-08 2006-01-19 Arbaflame Technology As Procede pour produire des pastilles de combustible
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