Coal powder preparation and coal powder conveying device

The utility model discloses a coal powder preparation and coal powder conveying device. The coal powder preparation disclosed by the utility model can be used for effectively preventing the coal powder leakage, reducing the explosive-proof grade and reducing the investment by adopting a negative pressure powder preparation technology. According to the coal powder preparation, a smoke gas furnace provides hot air used for the drying and conveying of coal powder inside a coal grinder, and fuel gas of the smoke gas furnace can generate heat by using liquified petroleum gas or system purge gas, so that the energy consumption cost is reduced; the coal powder collected by a coal powder collection device enters a coal powder storage bin after a fiber impurity contained in the coal powder is removed through a fiber separator or a vibrating screen, then normal-pressure coal powder inside the coal powder storage bin passes through two or three circular compression-decompression lock hopper containers and then enters a coal powder feed tank under the double actions of gravity and activated gas, the coal powder feed tank keeps the certain pressure difference with a gasification furnace, and the flow rate of the coal powder is controlled by a regulating valve; in a conveying process, not only are impurities contained in the coal powder removed, but also a plurality of circular compression-decompression lock hopper containers can ensure the stability of blanking. The coal powder conveying device disclosed by the utility model has the advantages of ingenuity in design, low cost and good using effect.