What are the gasification reactions of experimental furnace fuel
What are the gasification reactions of experimental furnace fuel
The fixed experimental furnace at atmospheric pressure generally uses lump anthracite or bituminous coal and coke as raw materials, and uses steam or the mixture of steam and air as gasification agent to produce gasified gas with carbon monoxide and hydrogen as the main combustible components.
The gasification reaction of solid fuel in the experimental electric furnace is divided into five layers according to the characteristics of the production process in the furnace. The drying layer - at the top of the fuel layer, the fuel contacts with cold coal, and the moisture in the fuel can be evaporated; Carbonization layer - under the drying layer, due to the similar temperature conditions with the retort, the fuel undergoes cold decomposition, releasing volatile and other carbonization products into coke, and the coke is transferred from the carbonization layer to the gasification layer for cold chemical reaction; Gasification layer is the main area of gasification process in the furnace. Carbon and gasification agent in the fuel react violently in this area. In view of different reaction conditions, the gasification layer can also be divided into oxidation layer and reduction layer. In order to produce gas in a fixed experimental furnace, firstly, the air passes through the fuel layer, and the carbon and oxygen are cooled to increase the temperature. Then, the steam and air are mixed through the fuel layer, and the carbon reacts with the steam and oxygen to generate the gas by absorption and cooling.
From the principle of chemical reaction in the gas making stage of the experimental electric furnace, it is hoped to form conditions conducive to steam decomposition and carbon dioxide reduction reaction. Therefore, it can be considered that it is advantageous to increase the thickness and temperature of the gasification layer, and to appropriately reduce the flow rate of steam. In the chemical reaction of carbon and steam, measures such as increasing the thickness of gasification layer and reducing the air flow speed can accelerate the reaction speed, increase the content of carbon monoxide and improve the steam decomposition rate.
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