Carbonization treatment method and device for organic matter with high water content

Abstract

The present invention aims to maintain carbide quality and reduce the consumption of auxiliary fuel for obtaining heat for carbonization in a carbonization furnace and heat for drying in a drying furnace in carbonization of high-water organic matter. After drying the organic matter with high water content in the drying furnace, carbonization is carried out in the carbonization furnace to obtain carbide, and the combustion air and auxiliary fuel are used in the combustion furnace to burn the dry distillation gas generated in the carbonization process of the carbonization furnace, and the exhaust gas is burned at the outlet of the combustion furnace. The temperature is maintained so that combustion is performed between the gas temperature required for the carbonization process in the carbonization furnace and the gas temperature required for the drying process in the drying furnace, the combustion exhaust gas from the combustion furnace is branched into at least two systems, and the combustion exhaust gas pipe of the first system is divided The combustion exhaust gas of the carbonization furnace is additionally heated to the gas temperature required for the carbonization process by the combustion device for the carbonization furnace, and then supplied to the carbonization process of the carbonization furnace, and the combustion exhaust gas of the combustion exhaust gas pipeline of the second system is supplied to the drying process of the drying furnace.

Description

technical field [0001] The invention relates to a carbonization treatment method and a device thereof, which are used for treating sludge, food processing residues, livestock excrement and other high-water content organic matter, especially nitrogen-containing high Aqueous nitrogen-containing organic matter is processed. Background technique [0002] In order to carbonize organic matter containing high moisture represented by sewage sludge, carbonization treatment is generally performed after drying the organic matter containing moisture as a raw material. Here, as a heat source for the carbonization treatment, combustion exhaust gas obtained by burning carbonization gas generated during the carbonization treatment is generally used (for example, Patent Document 1). However, when carbonization gas is used in this way, the carbonization temperature is affected by the amount of carbonization gas or its calorific value. As a result, there is a problem that the degree of carbo...

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Problems solved by technology

However, when carbonization gas is used in this way, the carbonization temperature is affected by the amount of carbonization gas or its calorific value

As a result, there are the following problems: the degree of carbonization is left to itself, and the quality of carbide products is not stable.

[0010] However, if the heat required for the carbonization treatment at the carbonization furnace 30 is obtained by mainly burning the auxiliary fuel at the combustion furnace 70, the heat required for the drying treatment at the drying furnace 20 is obtained by burning the dry distillation gas generated at the carbonization furnace 30. heat, the heat obtained by burning the dry distillation gas in the combustion furnace 60 is in excess of the heat required for the drying process in the drying furnace 20

Therefore, the combustion exhaust gas exceeding the amount required for drying treatment is sent to the pipe 64, even if heat exchange is performed with the exhaust gas from the drying furnace 20 in the circulating gas preheater 61, or heat exchange is performed with the outside air in the air preheater 73, heat loss

In addition, since heat loss occurs in this way, the amount of auxiliary fuel supplied to the combustion furnace 70 which is the heat source of the carbonization furnace 30 also increases.

Therefore, from the perspective of the carbonization treatment device as a whole, there is a problem that the consumption of auxiliary fuel (fossil fuel) per amount of carbide generation is high.

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