Patent ID: 9216444
Filing Date: 2015-12-22
Classification: B08B,C23C

Abstract:
1. A method for cleaning a bell jar reactor used for producing polycrystalline silicon in a Siemens method, having a separate inner wall and an outer wall structure, which generates polycrystalline silicon, the method comprising the steps of: providing a lower opening edge of the bell jar on a substantially disc-shaped tray; providing a shaft in a central portion of the tray in the vertical direction and a power source that is capable of rotating the shaft in clockwise and anti-clockwise direction around an axis of the shaft; fixing the lower opening edge of the bell jar reactor on the substantially disc-shaped tray; rotating the shaft clockwise and anti-clockwise with the power source; supplying a cleaning water to a nozzle device provided at an upper end of the shaft to spray the cleaning water to an inner peripheral surface of the bell jar at high pressure in three-dimensional directions with the nozzle device; draining a wasted cleaning water including a corrosive gas from a drainage hole formed in the tray; supplying steam between an outer wall and an inner wall of the bell jar; and drying the inner peripheral surface of the bell jar, wherein a feed screw is formed on an outer peripheral portion of the shaft, the tray is provided with a fixed nut which is screwed to the feed screw and guides the shaft upward and downward in accordance with rotation of the shaft, the nozzle device is rotated when the nozzle device is moving vertically upward and downward, a rotary housing, which protrudes horizontally from the nozzle device, rotates around an axis perpendicular to an axis of rotation of the nozzle device when the nozzle device is moving vertically, and the cleaning water is sprayed from a nozzle provided on an outer circumference of the rotary housing in a direction perpendicular to the rotating axis of the rotary housing, and wherein the shaft is rotated in one direction when the shaft is moving vertically upward and the shaft is rotated in an opposite direction when the shaft is moving vertically downward, and wherein the rotary housing is rotated by physical force obtained from the cleaning water running through the nozzle device.