JP2005140484A - Method for circulation type drying and pulverizing fuel system of waste, and device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem: industrial waste having a high water content, such as coffee grounds, tea grounds, or sewage sludge is limited in a treatment method, e.g. carbonization or melting. <P>SOLUTION: The method by the carbonization or the melting is a final treatment method, and fuel conversion is possible if technology capable of performing drying at low cost is present. In this method for a circulation type pulverizing fuel system of the waste, and device therefor, the waste is dried, is pulverized, is mixed with oxygen or dust coal when the waste is low-calorie substance, and is burned by use of a dedicated charcoal dust burner. Hot air thereof is utilized as a heat source for a swirl flow hot air drying device. The coffee grounds, the tea grounds, the sewage sludge or the like having a high water content discharged in large quantities by Japan having a small amount of resources is reused, and is effectively used before finally disposing of it. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  JP-A-11-309495

  After drying and pulverizing coffee residue, tea residue, sewage sludge, etc., the production of fuel for the pulverized coal burner is used to heat the inside of the hot air generating furnace with the pulverized coal burner, and the hot air is reused as a heat source for drying. Method and apparatus for circulating waste drying and pulverizing fuel system.

  When processing waste with a high water content, ocean dumping was prohibited, and in particular, the entire amount of coffee and tea residue was either disposed of by industrial waste businesses or incinerated. If the humidity is dried to 65%, the raw garbage is adjusted to a humidity of 65% by adding sawdust or rice husk for heating or moisture adjustment, and is made into an organic fertilizer. However, compost also has a problem with fertilizer quality and cannot be sold without the application of the fertilizer law.

  Compost is fermented and decomposed by bacteria and decomposes over time until it reaches protein such as garbage and starch, or semi-loose in the woody part, and decomposes to a place close to organic soil to make organic fertilizer. Nearly raw ones have been a favorite of bacteria since ancient times and could be decomposed by actinomycetes, but the coffee residue after extracting coffee cannot be treated with bacteria at all.

  It is a porous fruit, and even if it maintains a bacterial amenity environment, the coffee residue does not ferment at all.The reason is that it is roasted coffee. Although it is not dark but dark brown, it is roasted one step before it becomes black charcoal, so even the appetizing bacteria can not ferment at all and cannot ferment.

  After composting, carbonization treatment is expected to be used as a deodorant and harmful substance absorbent, but the water content of 85% or more is damaged, and the airflow drying method is always adopted before putting it into the carbonization furnace. Although there is no help for what must be carbonized, if it is intended to be fueled, it is better not to carbonize to maintain thermal power.

  The cement-fired rotary furnace uses a pulverized coal burner. Normally, the inside of the hot-air generator is warmed up with heavy oil until the temperature reaches a specified temperature, and the furnace temperature is raised to between 800 ° C and 1000 ° C, and then the pulverized coal is charged. Then, when the temperature rises to a level where it can be ignited instantaneously, it blows and burns together with about 1000 ° C. fresh air heat-exchanged from the exhaust hot air to maintain a constant furnace temperature.

  This system is not a pulverized coal burner of 10 to 20 times per hour like a cement firing furnace, but a small heat generating furnace of about 1/100, 100 kg to 200 kg per hour, and the fuel is 6000 Kcal of calorie. Since it is 4000 Kcal for coffee residue, it is necessary to compensate for the shortage of fuel. The coping method is combustion while performing oxygen replenishment control using a newly created spherical powder carbon dioxide mixing burner. For coal pulverized coal, nitrogen gas is controlled to cut off pulverized coal from the pressure vessel and avoid misfire due to volatile substances during pipe transfer to the pulverized coal burner. Use a nitrogen enrichment device or an oxygen enrichment device. Is the difference between using. Oxygen waste incineration has already been put to practical use by Swiss Thermo Select.

  In a cement firing furnace where ash will fly after combustion because it burns fine pulverized coal, it is not a problem even if ash of around 5% is mixed in the cement, so pulverized coal burner combustion is said to be suitable for the cement industry . Since this system is a recycle recycling method that is used for fuel production and becomes a fuel for combustion after drying, some ash contamination is within the acceptable range. It is necessary to take.

  In sewage sludge, Mitsubishi Materials Corporation has filed an application in Japanese Patent Application Laid-Open No. 11-309495 as a fuel for thermal power generation or cement burning by mixing and drying coal powder. However, it is necessary to consider air pollution countermeasures caused by coal combustion. If you add coal and make up for the calorie shortage, you don't need to supply oxygen.

  As vending machines and convenience stores are becoming established as a culture of Japan, the demand for canned coffee and canned tea has increased, and the production volume has been increasing year by year, resulting in an increase in production volume. Although processing after the extraction of coffee or tea leaves became a problem, most of them were commissioned by industrial waste processing companies or burned. However, the highly water-containing waste that has been regarded as a troublesome person by the present invention is restored to a useful resource by drying. A reusable recycling method was discovered.

  The greatest clue of the present invention is the swirling flow hot air drying device (Japanese Patent Application No. 2000-404312), which is a series of inventions from the adoption of a fine pulverization method after drying to the development of a pulverized coal burner, and its systematization. It is a new invention that becomes the gospel of soft drink related businesses, including coffee can filling businesses, due to the effects produced. Method and apparatus for circulating waste drying and pulverizing fuel system.

  The drawings show an embodiment of the circulating waste drying and pulverizing fuel system method and apparatus according to the present invention, and the drawings are a series of system flow diagrams.

  In the figure, reference numeral 1 denotes a material input hopper, which is input to the swirling flow drying furnace 2 by a known technique such as a rotary valve (not shown), and rapidly dried by lifting the switching blades in the furnace and swirling hot air. Is done. For details, refer to the applicant's Japanese Patent Application (2000-440412). Moisture during drying is vaporized and discharged from the chimney 3 to the atmosphere. When the odor is particularly strong, ancillary equipment such as a deodorizing device is required after the chimney 3.

  The dried product after drying is stored in the dried product storage hopper 4 and pulverized by the fine pulverizer 5. The finely pulverized dry matter is stored in the fine powder storage hopper 6. When the stored fine powder is low in calories, the fine powder is charged in a pulverized coal hot air oven 9 while being mixed with oxygen in the fine powder nozzle 8 by generating oxygen in the oxygen enrichment device 7 and is previously set to 800 ° C. or higher. It is burned instantly in the heated pulverized coal hot stove 9. When raising fine calories, coal fine powder is mixed and burned.

  The present invention has a high water content of 85% or more, such as coffee scum, tea scum or sewage sludge discharged from a drinking water filling company such as canned coffee. However, it has been shifting to an industrial waste disposal contractor at a high collection price, but the rise in the population has stopped, and due to the effects of bad weather etc. Or, the beginning of the momentum to begin exploring volume reduction or recycling methods, such as the construction of a scrapping method.

  The biggest obstacle to killing the above-mentioned momentum is based on the fact that a drying apparatus for waste disposal that has low initial cost and running cost has not been solved globally. However, the completion of the swirl flow hot-air drying device (2000-404312) was a momentum, and from the fine grinding to the development of new technology for pulverized coal burners, we have devised methods that have not been caught in the past. A system and method and apparatus are provided that provide a completely new technology that is not used and without conflict.

System structure diagram

Explanation of symbols

1. 1. To-be-dried hopper 2. Swirling hot air drying furnace Chimney 4. 4. Dry matter storage hopper 5. Fine grinding machine 6. Fine powder storage hopper Oxygen enrichment device 8. Fine powder nozzle 9. Pulverized coal hot stove 10. Ash collector

Claims (4)

  Wastes with high water content such as tea cass and coffee cass are dried to a moisture content of 10% or less, the dried product is pulverized by a fine pulverizer, and the particle size is classified to a certain size, and then the pulverized coal hot air Method and apparatus for drying and pulverizing fuel system for circulating waste characterized in that it is burned in a furnace and the hot air is reused as a heat source for the swirling hot air drying apparatus of Japanese Patent Application No. 2000-404312. .   The tea residue / coffee residue and sewage sludge having a high water content according to claim 1 are dried by a swirling flow hot air drying device, the applicant's Japanese Patent Application (2000-404312), etc., and finely pulverized by a pulverizer after drying, Maintaining a temperature range of 800 ° C. or higher in the pulverized coal hot air generating furnace by mixing pulverized coal when the calorie of the pulverized dry product is low, or by using a pulverized coal burner capable of supplying oxygen to the pulverized dry product. And a method and apparatus for drying and pulverizing fuel systems for circulating waste.   3. A method of drying and micronizing fuel system for circulating waste according to claim 1 or 2, characterized in that the calorie deficit of coffee residue and tea residue is compensated by mixing finely powdered coal. And its equipment.   Claims 1, 2, and 3 use a swirling hot air drying device to use heavy oil, fuel such as RDF or RPF only on the first day, and coffee scum, tea scum or sewage sludge corresponding to one day's fuel. The dried product is finely pulverized, hot air is generated in the pulverized hot air oven by the pulverized coal burner, and a series of reduction and recycling systems that are used as a heat source for the swirling hot air generator are provided. Method and apparatus for a dry and micronized fuel system.

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