Patent ID: 8152882

Claim:
A dust-catcher for blast furnace gas comprising: a pressure vessel with a gas inlet and outlet dome, a separation chamber a lower dust hopper, diffuser pipe extending axially through the gas inlet and outlet dome into the separation chamber; a flow deflecting chamber, having a smaller cross-section than the separation chamber, is centrally arranged in the separation chamber, so that there remains an annular settlement chamber between an inner wall of the separation chamber and the flow deflecting chamber; wherein the diffuser pipe is connected to the flow deflecting chamber so as to axially discharge a downward gas flow into a top end of the flow deflecting chamber, wherein this downward gas flow is deflected upward; and an annular swirling device with guide vanes is arranged in the top end of the flow deflecting chamber around a lower end of the diffuser pipe, so as to form a vortex gas flow rising around the diffuser pipe upward into the gas inlet and outlet dome.