| 摘要 |
The coal dust tank allowing the discharge of small metered quantities of coal dust into a regular stream comprises a metering container (11) housing the metering and discharge device. The tank (1) and the container (11) communicate by means of a conduit or opening (15) arranged at the lowest part of the tank (1). The tank (1) and the container (11) are provided with air permeable bottoms (4, 12) of which at least that (4) of the tank (1) is inclined at an angle comprised between 8 and 15`, and preferably 10` with respect to the horizontal line, and extends up to the discharge opening (15) of the tank (1). The space located under permeable bottoms (4, 12) is divided into a plurality of chambers by means of ribs or similar. Compressed air conduit (5, L2) open into these chambers. The conduits (5) connected to the chambers of the tank (1) start from an air distributor (6) which supplies air periodically by surge. The top of the tank (1) is crowned by a dome (2) or similar of which the inside is protected from the inside of the tank by a filter (8) and which is also connected to the air distributor (6) by surge by means of a conduit (L3n). A throttle valve (9), preferably adjustable, connects the dome to the atmosphere. The space located above the dust column in the metering container (11) communicates with the space located under the filter (3) by means of a conduit (20). Two level ganges (13, 14) of the metering container (11) control the air flow rate of the air distributor (6). |
