| 摘要 |
1,019,204. Wetting powders. FARBENFABRIKEN BAYER A.G. July 6, 1964 [July 5, 1963], No. 27790/64. Heading B1C. Powders may be wetted by introducing them into a gas/liquid mixture which has been ejected from a nozzle at at least the speed of sound. In Fig. 1 the powder hopper I is concentric within an annular nozzle 5, the powder being broken up and wetted by the atomized liquid in a shock wave zone 6; the powder hopper may alternatively surround the nozzle (see Fig. 2, not shown). In Fig. 3 a liquid supply pipe 18 opens into a gas supply pipe 17 and powder 14 is fed transversely downstream of the nozzle 16. The gas and liquid supply pipes are throttled and must be adjusted so that the pressure upstream of the nozzle is less than that in the pipes but at least twice as high as downstream of the nozzle, and the ratio of liquid to gas must always be small, i.e. about 1:100-1:1000. The liquid droplets and powder may be given opposite charges. The nozzle may discharge into a straight or curved tube or into a diffuser tube (see Figs. 4, 5 and 7, not shown). Fig. 6 shows a short cylindrical wetting chamber 25 having nozzles 26 to which gas and liquid are supplied by ring manifolds 28, 29, and powder through an aperture 24 just in front of at least one of the nozzles 26, the wetted powder being discharged at 27. Any powder contained in the discharged gas may be extracted in a cyclone and recirculated (see Fig. 7, not shown). |
