Atmospheric fixed experimental electric furnaces generally use massive anthracite or bituminous coal and coke as raw materials, and use steam or a mixture of steam and air as a gasifying agent to produce gasified coal gas with carbon monoxide and hydrogen as the main combustible components.
The gasification reaction of solid fuel is divided into five layers according to the characteristics of the production process in the furnace. The dry layer-at the top of the fuel layer, the fuel contacts the cold coal, the moisture in the fuel can be evaporated; the dry distillation layer-in the dry layer Below, because the temperature conditions are similar to the retorting furnace, the fuel undergoes cold decomposition and emits volatiles and other retorting products into coke. The coke is transferred from the retorting layer to the gasification layer for cold chemical reaction; gasification layer-gasification process in the furnace In the main area of the fuel, the carbon and the gasification agent in the fuel undergo a fierce chemical reaction. In view of the different reaction conditions, the gasification layer can also be divided into an oxidation layer and a reduction layer. To produce gas in a fixed experimental electric furnace, the air is first passed through the fuel layer, and carbon and oxygen undergo a cooling reaction to increase the temperature. Subsequently, steam and air are mixed through the fuel layer, and carbon and steam and oxygen undergo a mixed reaction of absorption cooling and discharge cooling to generate coal gas.
From the chemical reaction principle of the experimental electric furnace gas production stage, it is hoped to form conditions conducive to steam decomposition and carbon dioxide reduction reaction, so it can be considered that it is advantageous to increase the thickness and temperature of the gasification layer, and it is also very advantageous to appropriately reduce the steam flow rate . In the chemical reaction of carbon and steam, measures such as increasing the thickness of the gasification layer and reducing the gas flow rate can speed up the reaction rate, increase the content of carbon monoxide, and increase the rate of steam decomposition.
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