JP2013111498A - Garbage treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a garbage treatment system capable of efficiently drying garbage and turning it into resources while suppressing generation of an odor.SOLUTION: The garbage treatment system includes a gasifier for gasifying biomass and a garbage drier for drying the garbage, waste heat of the gasifier is introduced to the garbage drier as hot air, the garbage housed inside the garbage drier is dried with the waste heat, and exhaust from the garbage drier is returned to a distribution route of the hot air distributed inside the gasifier. Also, the garbage dried in the garbage drier is supplied to the gasifier and utilized as the biomass.

Description

  The present invention relates to a garbage disposal system.

  Conventionally, when processing garbage into resources, it can be broadly divided into a microbial decomposition method that reduces the volume by decomposing the garbage with microorganisms, and a high-temperature drying method that reduces the volume by drying the garbage at a high temperature. Is applied (see, for example, Patent Document 1).

JP 2004-167318 A

  On the other hand, the microbial decomposition method maintains the moisture content of food waste at 30 to 60% and warms it to about 60 ° C. to decompose aerobically by microorganisms. Sometimes an unpleasant odor occurs. Further, if the moisture content of the garbage is 70% or more, the microbial decomposition rate, which requires time, is drastically reduced, and an anaerobic state is generated to generate mercaptans and a strong odor is generated.

  In addition, the high temperature drying method is a method in which raw garbage is heated to, for example, 150 ° C. or less with a heater and dried, and even when raw garbage exceeds 80%, the moisture content is dried to about 10% in a short time. However, if it is processed in a temperature range exceeding 100 ° C., a burning odor due to aldehydes or the like is generated.

  In this way, when food waste is reduced in volume (recycling), microbial decomposition odors are generated by the microbial decomposition method, and burnt odors are generated by the high temperature drying method, so odor countermeasures using deodorizers and catalysts are taken. As a result, there is a problem that the cost of processing garbage becomes high.

  In order to achieve the above object, the present invention provides the following means.

  The garbage processing system of the present invention includes a gasifier for gasifying biomass and a garbage dryer for drying the garbage, and the garbage drying using the exhaust heat of the gasifier as hot air. The garbage introduced into the machine and dried in the garbage dryer is dried by the exhaust heat, and the exhaust from the garbage dryer is returned to the circulation path of the hot air flowing in the gasifier. It is characterized by that.

  In the garbage processing system of the present invention, it is desirable that the garbage, which has been dried by the garbage dryer, is introduced into the gasifier and used as the biomass.

  In the garbage processing system of the present invention, the gasification apparatus includes, for example, a gasification reaction furnace that supplies gas for gasification and an external heating furnace that supplies heat necessary for the gasification reaction. By introducing the exhaust heat at a high temperature of, for example, 200 to 600 ° C. of the gasifier as hot air into the garbage dryer, the garbage can be dried in a short time. In other words, it is possible to efficiently treat garbage without using wasteful fuel and electricity, using exhaust heat from a gasifier, which is difficult to use particularly in urban areas.

  In addition, by drying the garbage at a high temperature of 200 to 600 ° C. in this way, and further returning the exhaust from the garbage dryer to the hot air flow path in the gasifier, It is possible to reliably prevent the generation of bad odor that becomes a problem when garbage is treated. That is, odor countermeasures can be taken without using a deodorizing device or a catalyst.

  Moreover, by putting the garbage after being dried by the garbage dryer into a gasifier and gasifying it, the garbage can be recycled as biomass.

It is a figure which shows the processing system of the garbage which concerns on one Embodiment of this invention.

  Hereinafter, a garbage processing system according to an embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 1, the garbage processing system A of the present embodiment includes a gasifier 1 for gasifying biomass and a garbage dryer 2 for drying the garbage. Yes.

  The gasification apparatus 1 includes a gasification reaction furnace 3 and an external heating furnace 4. The gasification apparatus 1 inputs biomass into the gasification reaction furnace 3 and gasifies it to generate biomass gas containing carbon monoxide, hydrogen, and the like. At this time, the heat required for the gasification reaction is supplied in the external heating furnace 4. Since the gasification reaction temperature in the gasification reactor 3 is about 700 to 900 ° C., the external heating furnace temperature is kept at about 1000 ° C. or more. Further, part of the exhaust heat from the gasifier 1 is returned to the external heating furnace 4 through the heat exchanger 5.

  Examples of the garbage dryer 2 include a hot air co-current type rotary kiln with a stirring shaft, and a distribution path R through which the hot air of the gasifier 1 circulates and the interior of the garbage dryer 2 for introducing hot air. The exhaust return pipes are connected and arranged.

  And in the garbage processing system A of this embodiment, the high temperature exhaust heat 6 of the gasification apparatus 1 is introduce | transduced as a hot air into the garbage dryer 2 which accommodated the garbage inside, and this exhaust heat 6 is utilized. The garbage is dried. At this time, by using the exhaust heat 6 of the gasifier 1, the garbage is dried at about 200 to 600 ° C. several times higher than the temperature used in the conventional high-temperature drying method. Thus, for example, the garbage is dried at a temperature of 400 ° C. for a few minutes to 6 minutes.

  Further, the exhaust 7 after the garbage is dried by the garbage dryer 2 is reintroduced into the hot air flow path R of the gasifier 1. At this time, it is circulated in the apparatus 1 of the processing system A, and the exhaust 7 is returned to the flue having a temperature of 400 ° C. or higher, or is returned to the external heating furnace 4 having a temperature of 1000 ° C. or higher if the odor requirement level is high. Depending on the conditions, it can be reheated at a high temperature of about 1000 ° C. For this reason, the odor component which becomes a problem by the normal high temperature drying method can be reliably decomposed | disassembled by the high temperature contact for 5 seconds or more, for example.

  In this way, the generation of odor is suppressed and the garbage is dried in a short time. Moreover, in this embodiment, the dry garbage 8 after a process is supplied to the gasifier 1, gasified, and it utilizes for the production | generation of biomass gas. Thereby, the recycling of garbage can be achieved.

  Therefore, in the garbage processing system A of this embodiment, the gasification apparatus 1 supplies biomass and gasifies the gasification reaction furnace 3, and the external heating furnace 4 supplies the heat required for the gasification reaction. It is possible to dry the garbage in a short time by introducing the high-temperature exhaust heat 6 of, for example, 200 to 600 ° C. of the gasifier 1 into the garbage dryer 2 as hot air. become. In other words, it is possible to efficiently treat garbage without using wasteful fuel and electricity, using exhaust heat from a gasifier, which is difficult to use particularly in urban areas.

  In addition, by drying the garbage at a high temperature of 200 to 600 ° C. in this way, the exhaust 7 from the garbage dryer 2 is further returned to the hot air flow path R in the gasifier 1, so that Occurrence of bad odor that becomes a problem when garbage is treated by high temperature drying method can be surely prevented. That is, odor countermeasures can be taken without using a deodorizing device or a catalyst.

  Moreover, by putting the garbage 8 after being dried by the garbage dryer 2 into the gasification reactor 3 of the gasifier 1 and gasifying it, the garbage 8 can be recycled as biomass. become.

  Therefore, compared to conventional microbial decomposition methods and high-temperature drying methods, garbage can be dried in a short time, and the generation of odor can be suppressed without using a deodorizing device or catalyst. It is possible to greatly reduce the cost of processing (reducing volume and recycling) waste.

  As mentioned above, although one Embodiment of the garbage processing system which concerns on this invention was described, this invention is not limited to said one Embodiment, In the range which does not deviate from the meaning, it can change suitably.

1 Gasifier 2 Garbage Dryer 3 Gasification Reactor 4 Outer Heat Furnace 5 Heat Exchanger 6 Exhaust Heat 7 Exhaust 8 Dried Garbage A Garbage Processing System R Distribution Channel

Claims (2)

A gasifier for gasifying biomass and a garbage dryer for drying garbage;
The exhaust heat of the gasifier is introduced into the garbage dryer as hot air, the garbage stored in the garbage dryer is dried by the exhaust heat, and the exhaust from the garbage dryer is exhausted from the gas A garbage disposal system characterized in that it is returned to the distribution channel of hot air circulating in the gasification device. In the garbage processing system according to claim 1,
The garbage processing system, wherein the garbage dried by the garbage dryer is put into the gasifier and used as the biomass.

Images