Patent ID: 9333476
Filing Date: 2016-05-10
CPC Classification: B01J,B23K,F23C,F26B,F27B

Claim Text:
1. A grid nozzle assembly suitable to be mounted in a reaction chamber of a fluidized bed reactor comprising a horizontally extending bottom plate, a gas plenum chamber below the bottom plate, and vertical gas pipes having a top end and extending from the gas plenum chamber upwards across the bottom plate, the grid nozzle assembly comprising: a nozzle head with a gas channel for injecting fluidizing gas from one of the vertical gas pipes to the reaction chamber; and a tube sleeve adapted to be firmly fixed by welding around the top end of the vertical gas pipe, wherein the tube sleeve comprises an upper surface and the nozzle head comprises a horizontally extending top portion and a downwards extending stem adapted to fit into the tube sleeve, so that the horizontally extending top portion is in direct contact with the upper surface of the tube sleeve, and so that the nozzle head and the tube sleeve form a twist-lock enabling quick connecting and disconnecting of the nozzle head and the tube sleeve, wherein the tube sleeve also comprises an upper end, a central portion, and an internal surface with at least one groove, the at least one groove comprising a vertical groove portion extending from the upper end of the tube sleeve to the central portion of the tube sleeve and a horizontally extending groove portion in connection with a lower end of the vertical groove portion and extending at a predetermined angle from the vertical portion, and the stem comprises an outer surface with at least one knob fitting in the at least one groove, so as to enable the twist-locking of the nozzle head with the tube sleeve by inserting the knob into the vertical groove portion, sliding the stem downwards in the tube sleeve so far that the knob reaches the lower end of the vertical groove portion, and twisting the nozzle head so as to move the knob in the horizontal groove portion.