Patent ID: 8778274

Claim:
An ozone gas supply system, which supplies an ozone gas to each of a plurality of ozone treatment apparatuses while controlling a flow rate and a concentration of the gas, the system comprising: (I) a plurality of ozone generation units, wherein each ozone generation unit comprises: (Ia) an ozone generator, which generates an ozone gas; (Ib) an ozone power source, which controls power supplied to the ozone generator; (Ic) a mass flow controller (MFC), which controls a flow rate (Q) of a raw gas input into the ozone generator; (Id) an automatic pressure controller (APC), which automatically controls internal pressure that is pressure in the ozone generator; (Ie) an ozone concentration meter, which detects an ozone concentration value of the ozone gas output from the ozone generator; (If) an ozone control part, which performs an initial operation in which the ozone power source is driven with a predetermined set power amount (Ws), and after the elapse of a predetermined time period, performs a PID control on the power supplied by the ozone power source based on comparison between an ozone concentration (C) detected by the ozone concentration meter and an ozone concentration (Cs) that has been set; and (Ig) a control panel arranged at a front surface of each unit, wherein the ozone power source is arranged at a front portion of the unit and on a back surface of the control panel; the ozone generator is arranged in a back-stage position of the ozone power source so as to be able to arrange a raw gas supply port, an ozone gas outlet port, and cooling water inlet and outlet ports at a back surface side of the unit; the raw gas supply port in the ozone generator, the MFC connected to the ozone gas outlet port, at least one raw gas filter, the APC and the ozone concentration meter are arranged at a back portion and an upper portion of the ozone generator, or at a side surface of the back portion of the ozone generator; the raw gas supply port, the ozone gas outlet port and the cooling water inlet and outlet ports are arranged so to be connected from the back surface of the unit; and the ozone generator, the ozone power source, the MFC, the APC, and the ozone concentration meter are assembled together and packaged into one unit; (II) an ozone gas output flow rate management unit, configured to receive a plurality of ozone gas outputs from the plurality of ozone generators and capable of performing an ozone gas output flow rate control for selectively outputting an ozone gas output to any of the ozone treatment apparatuses by opening and closing a plurality of ozone gas control valves provided in the ozone gas output flow rate management unit; and (III) a system collective management unit, which, based on a process ozone gas event signal indicating at least an ozone concentration and an ozone flow rate supplied from each of the ozone treatment apparatuses, controls the ozone gas output of each ozone generation unit and causes the ozone gas output flow rate management unit to control the ozone gas output flow rate.