JP2011140610A - Method for producing composite fuel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a composite fuel which improves utilization of coal granules, fine powder coal, scot particles or plant based biomass in mixed combustion of a coal thermal power station. <P>SOLUTION: The method includes: a step of sticking a liquid filler to a combustible granules having a particle diameter of ≤2 mm or a combustible fibrous body having a length of ≤100 mm and thickness of ≤2 mm and a granulating; and a granulating and mixing step of granulating composite granules by sticking the fine powder coal having particle diameter of ≤2 mm or the scot particles to the combustible granules or the fibrous body to which the liquid filler is stuck and heating them by hot air while mixing them. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for producing a composite fuel comprising a composition in which combustible particles such as biomass and pulverized coal including carbon fine particles such as soot are mixed.

  Biomass is a concept that originally indicates the abundance of living organisms in ecology. As a term that refers to the entire biological resources such as energy sources and raw materials excluding fossil resources, it is generally used as an organic resource derived from renewable organisms. well known.

  Biomass is broadly divided into “waste”, “unused” and “crop”, and “waste” refers to so-called by-products generated by daily life and industrial activities, generally industrial waste. “Use system” refers to non-edible parts of agricultural products, thinned wood, and remaining forest land that are not effectively used at present, and other crops.

  In recent years, plant-based biomass fuel, which is one of the new energies that can replace fossil fuels, is attracting attention as biomass energy, which is a circulation type energy, due to the global warming problem, the oil resource depletion problem, and the like. Carbon dioxide is emitted when plant biomass burns. The carbon dioxide is absorbed while the raw material grass and trees are grown, so it is considered that there is no carbon dioxide emission overall, and the use of biomass fuel is not expected to increase the total carbon dioxide emission.

  Liquid biomass fuels such as biomass ethanol and biodiesel are attracting attention as being able to partially replace petroleum resources, but solid biomass fuels, for example, use coal as pulverized coal for efficient combustion. Biomass co-firing technology has been developed for power generation (see, for example, Non-Patent Document 1).

“FOCUS NEDO” Vol. 4 No. 15, pp15-16, Issue 15 July 10, 2004

  In the biomass co-firing technology, that is, the technology for efficiently co-firing coal and plant-based biomass having greatly different physical properties and combustibility, various efforts have been made to use existing coal-fired power generation facilities.

  There are roughly two types of biomass co-firing in coal-fired power plants. One is the introduction of wood biomass, such as wood chips and bark shaving chips, into an existing mill (pulverized coal machine) together with fuel coal, pulverizing it as a powder, and mixing fuel of pulverized coal and biomass particles into an existing burner The other is a method for burning in a boiler with a wood biomass separate burner separate from the coal pulverizer and a biomass burner separate from the coal burner. is there.

  In the former biomass co-firing method, both woody biomass and fuel coal are pulverized by a pulverized coal machine, so there is little modification of thermal power generation facilities. In a normal pulverized coal machine of coal-fired power generation, woody biomass with a lot of fiber is difficult to pulverize. Therefore, when the mixing ratio of biomass to be input to the pulverized coal machine exceeds several percent, the power consumption of the pulverized coal machine increases.

  The biomass co-firing method with a mill dedicated to woody biomass can increase the mixing ratio of pulverized coal and biomass, but it requires significant boiler equipment renovation compared to the former.

  On the other hand, in any coal thermal power generation of a fixed bed combustion system, a fluidized bed combustion system, and a spouted bed combustion system, coal is pulverized and burned in a boiler as granular or pulverized coal. Therefore, in any biomass co-firing method, a pulverized coal machine is necessary as before, and a large amount of pulverized coal that is not subjected to the original combustion is increased by pulverizing a large amount of coal with the pulverized coal machine. To do. That is, it is necessary to recycle and discard coal particles or pulverized coal that are not used for combustion.

  Furthermore, in oil-fired power generation as well as coal-fired power generation, heavy oil ash (dust) containing a large amount of unburned carbon is accumulated by dust collectors from the flue gas after combustion, and the soot particles need to be recycled and disposed of. Become. Here, fine particles mainly containing carbon contained in heavy oil ash (dust) such as soot are referred to as soot particles.

  Accordingly, an object of the present invention is to provide a method for producing a composite fuel capable of improving the utilization of coal particles, pulverized coal, soot particles, and plant biomass in mixed combustion in a thermal power plant.

The method for producing a composite fuel of the present invention comprises a step of attaching a liquid filler to a combustible granule having a particle size of 2 mm or less or a fiber length of 100 mm or less and a fiber thickness of 2 mm or less.
A granulation mixing step of granulating a composite granule by heating with hot air while adhering and mixing pulverized coal or soot particles having a particle size of 2 mm or less to the combustible granule or fiber body to which the liquid filler is adhered. It is characterized by.

  In the above-mentioned method for producing a composite fuel, the combustible granules or fiber body is made from coffee ground lees, tea husk, soybean koji, Chinese herbal medicine lees, shochu lees, citrus peels, sawdust, and paper sludge. One or more powder raw materials selected from the group consisting of:

  In the above composite fuel production method, pulverized coal or soot particles may be attached to the surface of the combustible particles or fibers to form a layer of pulverized coal or soot particles on the surface.

  The method for producing a composite fuel may include a step of molding the composite particles obtained in the mixing step with a press molding machine.

  The method for producing a composite fuel may include a step of forming the composite particles into a plate shape using a press molding machine.

  According to the present invention, a liquid filler is attached to a plant combustible granule or fiber body made of a pulverized product such as biomass, and pulverized coal or soot particles are added to the combustible granule or fiber body attached to the liquid filler at a predetermined ratio. Then, the mixture is granulated while being heated and heated to produce a composite fuel of composite granules. Further, by compressing the composite fuel of the composite particles, a liquid filler as a binder between the combustible particles or fiber bodies and a layer of pulverized coal or soot particles, for example, a plate-shaped high density molded fuel And can produce a solid fuel suitable for storage and transportation. By this solid fuel crushing and pulverization treatment, it can be used as a flaky composite fuel.

  If there is a difference in the particle shape, size, or specific gravity of pulverized coal or soot particles, even if they are mixed uniformly, they will be biased due to vibrations during transportation and movement even if they are in powder form. When granulated, the ratio of each component in each grain is fixed and fixed.

  If it is pulverized coal, the fluidity is high, it will flow too much at a stretch, it will not stay in the pulverized coal machine, dust generation is high and transportation efficiency is bad, and various problems occur because it is powder, but the bulk density due to granulation increases Such a problem can be solved by the composite particles.

  By making pulverized coal or soot particles into composite particles, the surface area per unit weight of the particles is reduced, so that moisture can be gradually released to the outside, and there are few parts in contact with the composite particles by granulating. Thus, the drying property can be controlled.

  In addition, when coal and biomass are co-fired at the same time, the combustion efficiency increases, or the nitrogen content in the biomass is less than the nitrogen content in the coal, so the concentration of NOx in the exhaust gas can be reduced and only the coal is combusted. It is also possible to reduce the thermal synthesis NOx produced in the process. In addition, mass production of the molded fuel can be improved and the manufacturing cost can be reduced by increasing the rotation speed at the time of molding the molded fuel by the press molding machine. Further, by crushing and pulverizing the plate-shaped molded fuel, a composite fuel corresponding to a multipurpose application such as a flaky fuel used in various boilers and a fine powder fuel used in thermal power generation can be produced. As a result, combustibility can be improved by co-firing the finely powdered composite fuel, and high efficiency can be achieved during low load combustion.

It is a block diagram which shows the manufacture procedure of the composite grain body in the composite fuel manufacturing method of embodiment of this invention. It is a schematic perspective view which shows the stirring tank and liquid filler tank which are used for the rough mixing process in the composite fuel manufacturing method of embodiment of this invention. It is a schematic perspective view which shows the composite fuel manufacturing apparatus used for the mixing granulation process in the composite fuel manufacturing method of embodiment of this invention. It is a schematic perspective view which shows manufacture of the composite fuel shape | molded, for example in the plate shape in the composite fuel manufacturing method of embodiment of this invention. It is a schematic perspective view which shows the grinding | pulverization of the composite fuel shape | molded, for example in plate shape in the composite fuel manufacturing method of embodiment of this invention. It is a graph which shows the moisture content dependence in the heavy oil ash of the emitted-heat amount of the composite fuel of the Example of this invention.

12 plant residue powder 13 liquid filler 14 pulverized coal or soot particles 15 first mixed raw material 17 liquid filler tank 21 agitation tank 22 agitator 31 housing 32 screw agitator 33 hopper 34 discharge port 35 composite granule 35b plate-like composite fuel 36 Dry hot air circulation piping 37 Humidity adjustment piping 38 Adjustment piping for pulverized coal or soot particles 41, 42 Flat plate type 51, 52 Parallel grinding rolls

  Embodiments of the present invention will be described below with reference to the drawings.

<Raw materials for composite particles>
The raw material of the composite granule is pulverized coal or soot particles, plant combustible granule or fiber, and liquid filler.

  Prepare pulverized coal or cocoon particles including coal particles having a particle diameter of 2 mm or less, coal powder (pulverized coal), or soot particles. The soot particles are particles mainly composed of carbon having a particle size of submicrometer (several hundred nm) to several hundred μm. The coal granular material is classified into at least two types according to the particle size, and is divided into, for example, a particle size of 1 mm or less and a particle size exceeding this. As the pulverized coal or soot particles, those supplied as waste from steelworks or thermal power plants are preferably used. The soot particles of the raw material may be heavy oil ash (soot dust) (EP (Electron Particle) ash) recovered by an electric dust collector after combustion, or EP ash after recovering valuable metals from EP ash. It is preferable to use a raw material containing a large amount of pulverized coal having a mesh size of 200 mesh (mesh 75 μm) or less. Regardless of the type of coal such as lignite, subbituminous coal, and bituminous coal, a wide range of coal can be used as a raw material.

  The plant combustible granule or fiber is preferably a biomass pulverized product. The plant-based biomass pulverized product is supplied from various food and beverage factories that are plant residue wastes, for example, coffee extract mash, tea husk, soybean cake, shochu squeezed mash, citrus peel crushed product, and the like. In addition, for example, herbal medicine extract candy is supplied after being pulverized to some extent in a pharmaceutical factory.

  Further, the plant residue includes pulverized biomass such as sawdust supplied from the woodworking plant.

  Furthermore, paper sludge supplied as waste from a paper mill can be used as plant combustible granules. Raw material recycling is progressing in paper mills, including recycled paper mills, in which not only pulp fibers are recovered from used paper in recycled paper manufacturing, but also technologies for recovering calcium carbonate, clay and talc, which are inorganic chemicals for paper manufacturing. The remaining papermaking sludge after collection contains pulp staple fibers and ink components, so that it can be incinerated. Thus, paper sludge can also be included in the plant residue.

  Using these plant residues, the moisture content is naturally dried to 20% or less and is not pulverized if the particle size is 2 mm or less, and if it is larger than this, it is pulverized to a particle size of 2 mm or less. Thus, plant combustible particles are produced. Or in the case of a long plant residue, a combustible fiber body is produced | generated by grind | pulverizing in the fiber shape or rod shape whose maximum diameter (thickness) is 2 mm or less and whose maximum length (fiber length) is 100 mm or less. Here, for the sake of explanation, the combustible fiber body and the combustible particle body are collectively referred to.

  In addition, combustible granules having a particle size of 2 mm or less or a fiber length of 100 mm or less and a fiber thickness of 2 mm or less are used for pulverized coal or soot particles coated on the surface of the plant combustible granules outside these ranges. This is because the amount of adhesion is insufficient.

  The liquid filler functions as a binder. Examples of the liquid filler include water and waste oil. As waste oil, waste oil such as engine oil supplied as waste from an automobile maintenance factory is preferably used.

<Preparation of raw materials>
FIG. 1 is a block diagram showing a production procedure of a composite fuel according to an embodiment of the present invention.

<Plant residue>
The plant residue is dehydrated and dried by, for example, sun drying (step S1 in FIG. 1). It should be noted that interstitial materials such as metal pieces are previously removed from the plant residue by filtering.

  Thereafter, the plant residue is pulverized into powder (step S2 in FIG. 1). However, a pulverizing step is not necessary for a powder already having a predetermined particle size such as a coffee extractor.

  Thereafter, the plant residue powder is classified into at least two types using a JIS standard sieve (step S3 in FIG. 1).

  Next, each classified plant residue powder is stored in a container (step S4 in FIG. 1).

<Pulverized coal or soot particles>
The coal powder supplied as waste from the steelworks and coal-fired power plant is dehydrated and dried by sun-drying (step S21 in FIG. 1). In addition, foreign matters such as metal pieces are previously removed from the coal powder by filtering. Similarly, the moisture of the soot particles supplied from an oil-fired power plant is adjusted and stored.

  Thereafter, the coal powder is classified into at least two types using a JIS standard sieve (step S23 in FIG. 1).

  Thereafter, pulverized coal and soot particles classified from the coal powder are respectively stored in containers (step S24 in FIG. 1).

<Binder: Liquid filler>
Various types of waste oil supplied as waste from an automobile maintenance factory or the like are filtered (step S31 in FIG. 1). That is, foreign matters such as metal pieces are previously removed from the waste oil by filtering.

  Thereafter, each classified waste oil is stored in a container (step S34 in FIG. 1).

  In addition, water can also be used as the caking additive, and by using industrial wastes such as black liquor, waste oil and waste grease, which are pulp industrial waste, and industrial molasses, high strength at low molding pressure A high combustion efficiency composite fuel can also be produced.

<Rough mixing process>
As shown in FIG. 2, one kind of each classified plant residue powder 12, one kind of pulverized coal or soot particles 14, and a liquid filler 13 such as waste oil are mixed to obtain a first mixed raw material 15. Is obtained (step S45 in FIG. 1). The method of injecting the binding material represented by water is not sprayed with a liquid, and the agitator 22 in the agitation tank 21 is excellent in dispersion power, and may be a rod-like batch injection without spraying.

  In this step, the plant residue powder 12, the liquid filler 13, and the pulverized coal or soot particles 14 are charged into the stirring tank 21, and mixed while stirring the charged material with the agitator 22. Thereby, the liquid filler 13 is made to adhere to the entire surface of the plant residue powder 12 relatively efficiently, and further, the pulverized coal or the soot particles 14 are also attached to obtain the first mixed raw material 15.

  In this step, the liquid filler 13 is sprayed from the liquid filler tank 17 and mixed simultaneously with other inputs. However, after the plant residue powder 12 is charged, the liquid filler 13 is charged first, and then Alternatively, pulverized coal or soot particles 14 may be added later and mixed.

  As a method for bringing the liquid filler 13 into contact with the plant residue powder 12 and attaching the liquid filler 13 to the entire surface of the plant residue powder 12, a belt conveyor (not shown) that conveys the plant residue powder 12 to the stirring tank 21 is shown. Or the like, when the plant residue powder 12 is sprayed with the liquid filler 13 first. That is, as a method for coating the surface of combustible particles with pulverized coal or soot particles, an impregnation method (immersion method), a coating method, a spray method, or the like can be used as appropriate.

<Mixed granulation process>
Next, the mixing granulation process of this invention is demonstrated concretely based on attached drawing.

  The first mixed raw material 15 roughly kneaded in the above rough mixing step is granulated while being prepared and mixed by a composite fuel production apparatus as shown in FIG. 3 (step S46 in FIG. 1).

  The composite fuel production apparatus shown in FIG. 3 includes a longitudinal hollow cylinder type housing 31 and a screw agitator 32 provided in the housing 31 along the longitudinal direction thereof. As shown in FIG. 3, the composite fuel production apparatus is supported by a support base (not shown) so that the housing 31 is inclined from the horizontal direction, and is opened upward on the charging start end side of the higher housing 31. A discharge port 34 opened downward is provided on the discharge end side of the lower housing 31. Below the discharge port 34, a means for conveying the obtained granulated material is movably provided.

  The screw agitator 32 is provided with a plurality of stirring trunks 32c (tooth bodies) arranged in a spiral manner around a rotation shaft 32b extending in the longitudinal direction of the housing 31, and the rotation shaft 32b is a feeder motor (not shown). ) To be rotationally driven. Due to the rotation of the screw agitator 32, the first mixed raw material 15 charged into the housing 31 from the hopper 33 is granulated from the charging start end side to the discharge end side of the housing 31 by the stirring trunk 32c while the composite granule 35 is granulated. It is configured to be. Depending on the rotational speed of the screw agitator 32, a plurality of stirring trunks 32c (tooth bodies) having different shapes can be used, or the pitch of the stirring trunk bodies 32c (tooth bodies) arranged in a spiral shape. The particle size of the composite granule to be granulated is adjusted by using one having a changed particle size.

  Furthermore, the composite fuel production apparatus as shown in FIG. 3 is provided with a pipe through which dry hot air circulates from the input start end side to the discharge end side of the housing 31. One end of the pipe 36 is openly connected to the upper end of the hopper 33 on the charging start end side of the housing 31, and the other end is openly connected to the discharge port 34 on the discharge end side. Is placed.

  The hot air heating in the dry hot air circulation pipe is preferably performed by blowing a gas with less oxygen from a heating gas generation source (not shown), and the composite particles are simultaneously dried by this heating. The circulating gas is preferably circulated in a safe atmosphere containing a large amount of water vapor and low oxygen. Further, the hot air heating temperature is limited to the range of 80 to 100 ° C. The reason why the sufficient amount of water vapor is not retained in the composite granule is less than 80 ° C. When the temperature exceeds 100 ° C., the pressure is increased to the atmospheric pressure or higher. It is necessary to raise it.

  Further, in the composite fuel production apparatus as shown in FIG. 3, the liquid filler is sprayed from the liquid filler tank (not shown) or from the water tank in the vicinity of the hopper 33 on the charging start end side of the housing 31 for humidity adjustment. A pipe 37 is provided. The outlet of the humidity adjusting pipe 37 is openly connected to the housing 31, and the liquid filler is added to the first mixed raw material 15 in the middle of the valve operation.

  Furthermore, in the vicinity of the intermediate point of the housing 31 in the composite fuel production apparatus as shown in FIG. 3, the pulverized coal or soot particles classified and dried from the pulverized coal or soot particle tank (not shown) are humidity-adjusted and pulverized. A piping 38 is provided for supplying the charcoal or soot particle layer coating. The discharge port of the pulverized coal or soot particle adjusting pipe 38 is openly connected to the housing 31, and the pulverized coal or soot particle is added to the first mixed raw material 15 in the middle by the valve operation.

  Next, the operation of the composite fuel production apparatus configured as described above will be described.

  The first mixed raw material 15 is weighed in advance and stored in the hopper 33, and then charged into the housing 31 at once by a valve operation. When dust is generated, external dust leakage can be prevented by connecting a dust collecting tube (not shown).

  The first mixed raw material 15 charged into the hopper 33 moves downward by a predetermined amount, passes through the housing 31 and falls from the discharge port 34. When the first mixed raw material 15 passes through the inside of the housing 31, it is exposed to hot air, deprived of moisture, and dried. By such a drying movement, the first mixed raw material 15 is gradually dried to become composite particles 35.

  More specifically, the raw first mixed raw material 15 charged in a batch is refined as if it had passed through a pulverizer by the high shearing force generated by the rotation of the screw agitator 32 and the strong stirring and mixing force. , Uniformly dispersed. Due to the liquid bridge (water or waste oil) between the plant residue and pulverized coal or cocoon particles, the plant residue and pulverized coal or cocoon particles approach, and the bulk density of the whole raw material gradually increases. As the mixture continues further, the aggregates of the plant residue and pulverized coal or cocoon particles are joined together by liquid crosslinking of the caking material to form a granulation nucleus.

  And as a principle of granulation, the pressure in the bridge | crosslinking of a caking additive is a negative pressure, and it becomes the adhesive force which acts between a plant residue and pulverized coal, or a cocoon particle | grain together with the surface tension of an caking additive.

  An adhesion force represented by such binder binding and a separation force represented by gravity and mechanical force act between the plant residue and pulverized coal or cocoon particles, and as a result of the balance, a certain size The composite particles are formed. Increasing the agitator speed increases the chance of contact between the composite grains and increases the speed of grain growth, while increasing the separation force and reducing the reachable size. Conversely, when the agitator speed is lowered, the separating force is weakened, and the composite particles can be grown larger. Therefore, it is possible to optimize the agitator speed in accordance with the degree of progress of granulation and obtain a composite granule having a target size.

  On the other hand, the larger the addition ratio of the binder forming the liquid bridge, the faster the growth rate of the composite particles, and the larger composite particles can be obtained. However, if the amount is too large, the size of each composite particle will continue to grow without converging, the amount of binder to be extruded on the surface of the composite particle will be excessive, the composite particle will collapse, and eventually the whole will be integrated so-called `` It becomes a state of “kneading”.

  Since the formation (granulation) of the composite particles is essentially an important factor for the composite particles themselves to rotate, the instantaneous rotation by contact of the screw agitator 32 with the stirring trunk 32c alone is sufficient. In the case where a subsequent rotational motion is also required, the housing 31 may be further rotated to provide a structure that assists the “rolling” of the entire material.

  When the composite granule is sized by agitation granulation, the shape of the composite granule is far from a true sphere and many irregularities on the surface are observed. However, even if the surfaces of the composite particles are wet, the granulated composite particles can be prevented from sticking together by hot air drying. It is also possible to prevent such sticking by introducing and mixing dry pulverized coal or soot particles before the end of granulation and absorbing the binder on the surface. At this time, by adding dry pulverized coal or soot particles, a “coating process” on the surface of the composite particles can be performed. A pulverized coal or soot particle layer may be formed on the surface of the composite granule and dried by heating at a temperature at which natural drying or adhesion does not decrease.

  In addition, the batch operation of the manufacturing apparatus has been described above. However, the continuous operation is selected when the amount of processing is emphasized for the purpose of increasing the bulk density or increasing the unit weight, but not limited by the intragranular mixing degree, shape, and particle size distribution. May be.

<Press molding process>
As shown in FIG. 4, the composite particles 35 obtained by the composite fuel production apparatus can be cooled to room temperature by air cooling or the like, and then molded into a predetermined shape by a press molding machine.

  The composite particles 35 are supplied onto one flat plate 41 of a pair of flat plates (FIG. 4A), and the other flat plate 42 of the flat plate is pressed from above the composite particles 35 with pressure ( 4 (b)), it can be formed into a thin plate-like composite fuel 35b (FIG. 4 (c)).

  Further, the composite granule 35 is supplied between the parallel rolls and continuously formed into a thin plate shape by a press molding machine (not shown) having a pair of parallel rolls having a smooth outer peripheral surface separated by a predetermined gap. Also good.

  As shown in FIG. 5, after drying the obtained plate-like composite fuel 35b to a predetermined hardness, the pair of parallel pulverizing rolls 51, 52 are separated by a predetermined gap and each has a parallel tooth group on the outer peripheral surface. Accordingly, the plate-shaped composite fuel 35b may be supplied between parallel pulverizing rolls by a belt conveyor or the like and discontinuously pulverized to generate pulverized pieces.

  The plate-like composite fuel 35b is molded with a high compressive force while giving it to the fibrous plant residue powder with a strong shearing force by a press molding machine, so that the fibrous plant residue powder is strongly entangled with each other to obtain a high-density fuel. be able to. As a result, pulverized coal or soot particles are pressed and integrated between plant residue powders that are easily deformable and easy to mold, so that the plate-like composite fuel 35b is pulverized. Even if it processes, isolation of a plant residue powder and pulverized coal, or a soot particle does not occur easily. Therefore, plate-shaped composite fuel 35b having various shapes and sizes with high mechanical strength and good storage properties can be produced.

  The calorific value of coal-fired power generation was confirmed by the following experiment.

  The pulverized coal supplied from the thermal power plant, the coffee grounds supplied from the beverage factory, and the engine oil (waste oil) supplied from the automobile maintenance factory were used.

  The pulverized coal was a powder of 200 mesh (aperture 75 μm) or less 75%, 100 mesh or less 90% and moisture 20% or less.

  The coffee extract is a granulated product with a water content of 20% or less, mainly containing so-called coarse grind (18-20 mesh), medium grind (24-28 mesh) and fine grind (30-32 mesh). Met.

  The above pulverized coal, coffee extract (plant residue: combustible granule) and waste oil were mixed at a mixing ratio of 1: 0.5: 0.001 (parts by weight), and Sample 1 was 1: 1: 0. .001 (parts by weight) mixed at a mixing ratio of sample 1, sample 2: mixed at a ratio of 1: 1.5: 0.001 (parts by weight), and sample 3 prepared by the above composite fuel production apparatus While granulating, a composite granular fuel was produced (see Table 1 below).

  Instead of coffee brewers, tea husk supplied from food and beverage factories, Chinese medicine extract potatoes supplied from pharmaceutical factories, soybean cake supplied from food and beverage factories, and paper sludge supplied from paper factories (each 20% or less moisture) ), Samples 4 to 15 were produced in the same manner as the above samples 1 to 3 at the blending ratios shown in Tables 2 to 5 below, and fuels of composite granules were produced respectively. Confirmed to meet the warranty.

  The heat quantity guarantee of coal-fired power generation was further confirmed by the following experiment.

  Two lots of soot particles supplied from an oil power plant (wet soot particles: heavy oil ash 1 (moisture 46.84 wt%) and heavy oil ash 2 (moisture 32.63 wt%)) were each dried (moisture 0 wt%). The ingredients were examined. The results are shown in Table 6.

さらに、原料に微粉炭に代え煤粒子（重油灰）とした以外、上記実施例１と同様に上記コーヒー抽出糟（原料a）及びエンジンオイル（０．００１重量部）を用い、下記の表７の配合割合（重量部）で混合し、複合燃料製造装置で調製しつつ造粒して、複合燃料（試料１、２、３）を製造して、熱量分析を行ったところ、原料a割合が試料１に比べ試料３で３倍に増加しても熱量保証を満たすことを確認した。

Further, the above coffee extract mash (raw material a) and engine oil (0.001 part by weight) were used in the same manner as in Example 1 except that the raw material was replaced with pulverized coal instead of pulverized coal (Table 7). Were mixed at a blending ratio (parts by weight) of the above, granulated while preparing with a composite fuel production device to produce a composite fuel (samples 1, 2, 3), and calorimetric analysis was performed. It was confirmed that the heat amount guarantee was satisfied even when the sample 3 increased 3 times compared to the sample 1.

さらにまた、試料１、２、３，の複合燃料の発熱量の重油灰中の水分量を代えたものを調製し、それぞれに関する発熱量を測定し発熱量の水分量依存について調べた。試料１については0%から14.7%，30.0%，39.2%へ、試料２については0%から29.1%へ、試料３については0%から30.0%へ変化させた。その結果を表８に示す。

Furthermore, samples of 1, 2 and 3 were prepared by changing the calorific value of the combined fuel in the amount of water in the heavy oil ash, and the calorific value of each was measured to examine the dependency of the calorific value on the amount of water. The sample 1 was changed from 0% to 14.7%, 30.0%, and 39.2%, the sample 2 was changed from 0% to 29.1%, and the sample 3 was changed from 0% to 30.0%. The results are shown in Table 8.

上記実験（乾燥（水分０wt％）をも含む）の試料１、２、３の複合燃料○、□、△の発熱量の重油灰中水分量依存を図に示す。バイオマスなどの可燃粒体の配合割合と微粉炭又は煤粒子の水分量調節とを行えば、所望の発熱量を達成し得る複合燃料が製造できる事が分かった。

The figure shows the dependence of the calorific value of the composite fuels ◯, □, and △ of samples 1, 2, and 3 in the above experiment (including drying (including 0 wt% moisture)) on the moisture content in heavy oil ash. It was found that a composite fuel capable of achieving a desired calorific value can be produced by adjusting the blending ratio of combustible particles such as biomass and adjusting the water content of pulverized coal or soot particles.

  As described above, the composite fuel manufacturing method according to the present invention has been described with respect to the embodiment using the coffee extract cake, the Chinese medicine extract cake, the tea shell, the soybean cake, and the papermaking sludge as the combustible particles, but the present invention is not limited thereto. In addition, as combustible granules, one or more powder raw materials selected from the group consisting of shochu squeezed rice cake, citrus peel pulverized material, sawdust and wood pulverized material, can be easily added by those skilled in the art. Deletion / change / improvement are included in the present invention.

Claims (5)

A step of attaching a liquid filler to a combustible granule having a particle size of 2 mm or less or a fiber length of 100 mm or less and a fiber thickness of 2 mm or less;
A granulation mixing step of granulating a composite granule by heating with hot air while adhering and mixing pulverized coal or soot particles having a particle size of 2 mm or less to the combustible granule or fiber body to which the liquid filler is adhered. A method for producing a composite fuel characterized by the above.   The combustible granule or fiber body is at least one selected from the group consisting of coffee extract cake, tea husk, soybean cake, Chinese medicine extract cake, shochu squeezed rice cake, citrus peel pulverized product, sawdust and pulverized paper sludge It is a powder raw material, The manufacturing method of the composite fuel of Claim 1 characterized by the above-mentioned.   The method for producing a composite fuel according to claim 1, wherein a layer of pulverized coal or soot particles is formed on the surface of the combustible particles or fiber body to adhere to the pulverized coal or soot particles.   The method for producing a composite fuel according to any one of claims 1 to 3, further comprising a step of molding the composite particles obtained in the mixing step with a press molding machine.   The method for producing a composite fuel according to claim 4, comprising a step of forming the composite particles into a plate shape by a press molding machine.

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