How to Enhance the Production Process of Coal Gasifier?
How to Enhance the Production Process of Coal Gasifier?
Numerous studies and production practices have proven that the gasification intensity in a fixed bed coal gasifier can reach 450~500kg/(m2·h) without affecting the quality of the gas or the operation of the furnace.
Research on the gasification reactions in the reduction layer has demonstrated that there is significant potential for reaction rates. Under existing production conditions (air-steam air blast; fixed bed layer, atmospheric pressure operation), it is possible for coal gasifiers to further increase the gasification rate without affecting the quality of the gas.
Gasifier burner
In industrial practice and experiments on reduction reactions, it has been proven that when the gasification intensity is below 600kg/(m2·h) and the temperature of the gasification layer is 1100~200℃, the reaction actually occurs in the external diffusion zone. That is to say, while increasing the mass transfer rate, the gasification rate will also increase accordingly, and the composition of the gas will not actually change significantly. However, if this range is exceeded, the reaction will transferred to the power zone, the reaction rate cannot keep up with the increase of the blowing rate, so a portion of the gas passes through the reduction layer without reduction, causing the quality of the gas to deteriorate. To improve this situation, it is necessary to increase the temperature of the reaction layer, or increase the surface area of the reaction layer (ie increase the fuel height or decrease the fuel size). However, in ordinarystructured layered coal gasifiers, the allowable temperature of the gasification layer is determined by the melting point of the ash content, so it cannot be excessively increased, and the fuel size cannot be excessively decreased. Therefore, it can be considered that under the current gasification conditions, a reasonable gasification intensity should not exceed 600 kg/(m2·h).
For the combustion and gasification of carbon, a multi-phase reaction, the reaction rate is high at high temperatures. Therefore, the rate of the gasification process mainly depends on the diffusion rate of the gas to the reaction surface, which is directly related to the gas flow rate in the coal gas burner. Therefore, increasing the air volume and improving the flow rate is the main means of intensifying production.