Appeal No. 2000-1300
Application 08/853,581
practice, simplification of Chapman by the elimination
of a separate complex mixing valve, provides
sufficient reason.
Chapman addresses a wet oxidation system for treatment of
waste water. In such a system large amounts of oxygen or oxygen
containing gas are introduced into waste water before the waste
water is introduced into a high temperature reactor (18) in
which oxidation takes place at elevated temperatures. In its
basic form (Figure 1) the system in Chapman includes a liquid
oxygen storage tank (22), a high pressure pump (26) for pumping
said liquid oxygen thereby raising its pressure, an evaporator
(28) for evaporating said liquid oxygen, nitrogen supply means
(20, 24, 30) for supplying nitrogen, a first mixer (32) for
mixing the evaporated oxygen and nitrogen, and a second mixer
(16) for mixing the oxygen/nitrogen mix with waste water to be
treated in the reactor (18). Downstream of the first mixer
(32), the oxygen content of the gas mixture is measured by an
oxygen monitor (36) and a feedback control (38) adjusts the
mixing of the gas components (in mixer 32) to correct any
deviation of the actual composition of the gas mixture from the
desired composition of the gas mixture.
McLoughlin relates to a chemical injection control system
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