| 摘要 |
PURPOSE:To produce crystalline particles whose diameter is made uniform by installing an annular pipe having a lot of liquid jetting ports in the lower end of an outer pipe of a draft tube and circumferentially and uniformly feed a dissolved liquid to a crystallizer through the annular pipe. CONSTITUTION:A liquid return pipe 23 is connected to an annular pipe 18 integrally installed in the lower end of an outer pipe 9 of a draft tube 10. A heated dissolved liquid 1 in an outer circulating device 17 is uniformly and circumferentially fed into a crystallizer 2 from a lot of liquid jetting ports 17 formed in the annular pipe 18. Therefore the dissolved liquid 1 uniformly comes into contact with crystalline particles which are circulated up and down and agitated in the crystallizer 2 to uniformly grow them. And a feed liquid pipe 24 is connected to the liquid return pipe 23 and the feed liquid 4 is fed, mixed in the dissolved liquid 1 returned to the crystallizer 2. Consequently the feed liquid 4 is uniformly distributed in the crystallizer 2 to prevent the unevenness of the concentration and temperature of the dissolved liquid 1, allowing crystalline particles of uniform diameter to be produced. |
