| 摘要 |
<p>A heat exchanger (22) for use in a fluid treatment apparatus includes an insulated tubular conduit (24) having concentric telescopically nested spaced tubes (120,126), wherein the space between the tubes is sealed and filled with an inert gas. The surfaces (122,124;128,130) of the tubes (120,126) are coated with a hydrogen permeation barrier preferably compr ising an aluminium-iron alloy, nickel or copper which limits atomic hydrogen permeation into the space between the tubes, which would combine to form hydrogen gas and result in heat loss. The insulated tubular conduit (24) is telescopically nested in a pipe (28), forming a fluid heat exchanger and the heat exchanger is telescopically nested in fluid waste circulation pipes (32, 36), forming a fluid treatment apparatus (20). The preferred fluid heat exchanger is a vertically extending deep well reactor suitable for wet oxidation reaction of fluid wastes including municipal sludge.</p> |
