Method for disposing of organic waste of high water content and disposal apparatus therefor

Abstract

A method for disposing of an organic waste of high water content according to the present invention, includes: a step in which by means of a heat exchanger (22), a heat exchange is carried out between superheated steam and exhaust gas extracted by a cyclone (2b) of a suspension preheater (2), the high temperature superheated steam that was subjected to the heat exchange is introduced to a dryer (23), thereby drying any organic sludge into a dried organic waste, and by means of the heat exchanger (22), the superheated steam used for the drying is subjected to another heat exchange, thereby recycling the superheated steam in the drying of the organic sludge; and a step in which the resulting dried organic sludge is supplied to a precalcining furnace (3) as fuel and combusted.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for disposing of an organic waste of high water content and a disposal apparatus therefor, and more specifically relates to a method for disposing of an organic waste of high water content and a disposal apparatus therefor, with which effective utilization of the organic waste of high water content as fuel can be attained by drying the organic waste of high water content with the use of a cement burning facility, and with which the operation efficiency of cement burning facility can be enhanced without the possibility of adversely affecting the operation of the cement burning facility in spite of the use of the gas extracted inside the cement burning facility.[0002]Priority is claimed on Japanese Patent Application No. 2006-300605, filed Nov. 6, 2006, the content of which is incorporated herein by reference.BACKGROUND ART[0003]In a rotary kiln of a cement burning facility, the combustible wastes such as scrap tires and w...

AI Technical Summary

Benefits of technology

[0064]According to the method of the present invention for disposing of an organic waste of high water content, since the organic waste of high water content is dried to produce a dried organic waste through the use of a heating medium, which has exchanged heat with a high temperature gas extracted from the cement burning facility, the operation of the cement burning facility is not adversely affected, and the obtained dried organic waste can be effectively used as a fuel in the cement burning facility.

[0065]In addition, since another heat exchange between the heating medium after being subjected to a drying process and the high temperature gas is conducted and thereby recycling the heating medium for drying the organic waste of high water content, the heating medium can be reused efficiently and effectively.

[0066]According to the apparatus of the present invention for disposing of an organic waste of high water content, since the apparatus includes a heat exchange unit that carries out a heat exchange between a high temperature gas extracted from the cement burning facility and a heating medium; a drying treatment unit that dries the organic waste of high water content to produce a dried organic waste by using the heating medium which has exchanged heat; a circulation line that circulates the heating medium after being subjected to a drying process between the heat exchange unit and the drying treatment unit; and a supply line that supplies the dried organic waste to the cement burning facility or a combustion apparatus, the sensible heat contained in the exhaust gas discharged from the cement burning facility can be used effectively, and the cement clinker burning capacity of the cement burning facility can be improved without adversely affecting the operation of the cement burning facility.

[0067]In addition, since another heat exchange between the heating medium after being subjected to a drying process and the high temperature gas is conducted and thereby recycling the heating medium for drying the organic waste of high water content, the heating medium can be reused efficiently and effectively.

Problems solved by technology

Meanwhile, in the above method where the organic aqueous sludge is directly introduced to a rotary kiln and incinerated, there has been a problem of dramatic reduction in the capability of cement clinker burning of cement burning facilities, which is associated with the evaporation of water in the aqueous sludge and which is due to the decline in material temperatures in the bottom portion of a rotary kiln, the decline of sensible heat in the materials that are heated and decarboxylated in a suspension preheater or a precalcining furnace, the decline of temperature in a zone where a cement material is sintered into a clinker form (that is, kiln burning zone), or the like.

Moreover, since the quantity of heat or electricity usage per unit clinker at the time of cement clinker burning increases, there was also a possibility of difficult operation due to the economic reasons.

However, as in this system for the waste to fuel conversion, when the high temperature gas extracted from a suspension preheater is used as a heat source, the operation of the cement burning facility is adversely affected to a relatively lesser extent, and the heat source in the cement burning facility can be used effectively.

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