Method for granulation and granulator

An improved granulation method comprising the steps of providing a granulator having a granulation section whose bottom wall is a perforated plate, an air feed pipe for feeding air for fluidization to the bottom wall of the granulation section, and spraying nozzles provided in the bottom wall for spraying a molten raw material by using highly pressurized air as an auxiliary gas and spraying a molten raw material from the spraying nozzles onto approximately spherical nuclei in the granulation section, which have an average particle diameter of 0.4 to 3.0 mm, to form product granules.

An improved granulation method comprising the steps of providing a granulator having a granulation section whose bottom wall is a perforated plate, an upper air feed pipe for feeding air for fluidization to the bottom wall of the granulation section, a lower air feed pipe, secondary air feed pipes branching from the lower air feed pipe for feeding air into the granulation section, spraying nozzles provided at the centers of the secondary air feed pipes for spraying a molten raw material, and one or more partition walls provided on the bottom wall for partitioning the secondary air feed pipes, so that the partition walls form a passage in which nuclei may be moved continuously from the inlet of the granulator toward the outlet of the granulator and spraying a molten raw material from the spraying nozzles onto the nuclei, which are approximately spherical, in the granulation section, and which have an average particle diameter of 0.4 to 3.0 mm, to form product granules.

An improved granulation method comprising the steps of providing a granulator having a granulation section whose bottom wall is a perforated plate, an air feed pipe for feeding air for fluidization to the bottom wall of the granulation section, spraying nozzles provided in the bottom wall for spraying a molten raw material by using highly pressurized air as an auxiliary gas, and one or more partition walls provided on the bottom wall for partitioning the nozzles, so that the partition walls form a passage in which nuclei may be moved continuously from the inlet of the granulator toward the outlet of the granulator and spraying a molten raw material from the spraying nozzles onto the nuclei, which are approximately spherical, in the granulation section, and which have an average particle diameter of 0.4 to 3.0 mm, to form product granules.

An improved granulator comprising a granulation section whose bottom wall is a perforated plate, an upper air feed pipe for feeding air for fluidization to the bottom wall of the granulation section, a lower air feed pipe, secondary air feed pipes branching from the lower air feed pipe for feeding air into said granulation section, and spraying nozzles provided at the centers of the secondary air feed pipes for spraying a molten raw material liquid and forming granules by spraying a molten raw material onto nuclei fed into the granulation section, the nuclei having a prescribed particle diameter, and the direction of flow of air passing through holes in the perforated plate having a slanted angle to the direction of flow of granules with respect to the vertical axis.

An improved granulator comprising a granulation section whose bottom wall is a perforated plate, an upper air feed pipe for feeding air for fluidization to the bottom wall of the granulation section, a lower air feed pipe, secondary air feed pipes branching from the lower air feed pipe for feeding air into the granulation section, spraying nozzles provided at the centers of the secondary air feed pipes for spraying a molten raw material, and partition walls provided on the bottom wall for partitioning the secondary air feed pipes so that the partition walls form a passage in which nuclei may be moved continuously from the inlet of the granulator toward the outlet of the granulator, and form granules by spraying a molten raw material from the spraying nozzles onto the nuclei in the granulation section, the nuclei having a prescribed particle diameter, and the direction of flow of air passing through holes in the perforated plate having a slanted angle to the direction of flow of granules with respect to the vertical axis.

An improved granulator comprising a granulation section whose bottom wall is a perforated plate, an air feed pipe for feeding air for fluidization to the bottom wall of the granulation section, and spraying nozzles provided in the bottom wall for spraying a molten raw material liquid by using highly pressurized air as an auxiliary gas and forming granules by spraying a molten raw material onto nuclei in the granulation section, the nuclei having a prescribed particle diameter, and the direction of flow of air passing through holes in the perforated plate having a slanted angle to the direction of flow of granules with respect to the vertical axis.

An improved granulator comprising a granulation section whose bottom wall is a perforated plate, an air feed pipe for feeding air for fluidization to the bottom wall of the granulation section, spraying nozzles provided in the bottom wall for spraying a molten raw material by using highly pressurized air as an auxiliary gas, and partition walls provided on the bottom wall for partitioning the nozzles and forming a passage in which nuclei may be moved continuously from the inlet of the granulator toward the outlet of the granulator and form granules by spraying a molten raw material from the spraying nozzles onto the nuclei in the granulation section, the nuclei having a prescribed particle diameter, and the direction of flow of air passing through holes in the perforated plate having a slanted angle to the direction of flow of granules with respect to the vertical axis.

A granulator comprising one or more partition walls provided on a bottom wall of a granulation section, the partition walls being parallel to the walls of the granulator and forming a passage in which nuclei may be moved continuously from the inlet of the granulator toward the outlet of the granulator, the partition walls being staggered so that at least one of the partition walls extends from a first side of the granulator toward an opposite side of the granulator, and another partition wall extends from the opposite side of the granulator toward the first side of the granulator.