A coal gasification device

Abstract

The invention discloses a coal gasification device, and relates to the technical field of coal gasification equipment. The coal gasification device is used for solving the problem of how to enable flyash in raw gas exhausted from a fluidized bed gasification furnace to smoothly return to the fluidized bed gasification furnace, and besides, is used for realizing effective transformation of the flyash. The coal gasification device comprises the fluidized bed gasification furnace, a gas-solid separation device, a material returning pipe, an atomization and granulation nozzle, and a liquid supply unit, wherein the fluidized bed gasification furnace comprises a furnace body and an exhaust pipe arranged on the furnace body; the gas-solid separation device is connected with the exhaust pipe; one end of the material returning pipe is connected with a solid discharging pipe of the gas-solid separation device; the other end of the material returning pipe extends downwards and is connected withthe furnace body; the atomization and granulation nozzle is arranged on the side wall of the material returning pipe; and the liquid supply unit is connected with the atomization and granulation nozzle. The coal gasification device disclosed by the invention is applied to a coal gasification reaction.

Description

technical field [0001] The invention relates to the technical field of coal gasification equipment, in particular to a coal gasification device. Background technique [0002] At present, the fluidized bed gasifier has been more and more widely used because of its advantages such as high gasification intensity, uniform temperature in the furnace, good gas-solid contact, and high gasification efficiency. However, the fluidized bed gasifier also has the problem of a large amount of fly ash carried in the discharged crude gas, and if the carried fly ash cannot be effectively utilized, the system efficiency will be greatly reduced. [0003] In the prior art, in order to realize the effective utilization of the fly ash in the raw gas, the fly ash in the raw gas is usually separated by a gas-solid separation device, and the fly ash is introduced into the fluidized bed gasifier through the return pipeline Continue to convert. However, in the return pipeline, due to the high pressu...

AI Technical Summary

Problems solved by technology

However, in the return pipeline, due to the high pressure in the fluidized bed gasifier and the small particle size of the fly ash, under the action of high pressure resistance, the flowability of the fly ash is poor, and it is easy to cause blockage and fail to flow smoothly. Material return, in order to avoid this problem, in the prior art, a mechanical valve is usually installed in the material return pipeline, and at the same time, the blowing gas is externally connected. The mechanical valve can prevent the high pressure in the fluidized bed gasifier from being connected to the gas-solid separation device. The blowing air can blow the fly ash into the fluidized bed gasifier, but because the mechanical valve bears the strong scouring force of the fly ash, the wear of the mechanical valve is serious, so the running time of the return pipeline is short, and the blowing gas The blowing pressure is not easy to control. If the blowing gas pressure is too low, the fly ash cannot be blown into the fluidized bed gasifier; into the gas-solid separation device, resulting in the failure of the gas-solid separation device, which in turn leads to the inability of the fly ash to return to the gasifier

In addition, due to the small particle size of the fly ash, even if it is returned to the fluidized bed gasifier, it will be quickly taken out of the gasifier by the gas due to the small particle size. The residence time is short, the conversion efficiency of fly ash is low, and it has not been effectively utilized

Images