Title:
HEATING TUBE FOR HEAT EXCHANGER
Document Type and Number:
Japanese Patent JP3548446
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a heating tube for heat exchanger excellent in thermal efficiency and can be used for a long term by employing ceramics having porosity within a specified range and a deterioration rate at a specified heat shock temperature from an initial room temperature strength of a specified value or less thereby eliminating corrosion even under high temperature environment.
SOLUTION: A flange 2 is provided around the opening of a heating tube 1 which is arranged in the exhaust duct of an incinerator and used while being exposed. Ceramics having porosity of 10-35% or above is employed as the material of the heating tube 1. Heat shock relaxing effect can not be ensured when the porosity is lower than 10% and the efficiency deteriorates if it exceeds 35% because the air being heat exchanged has high inner pressure and leaks out. Deterioration rate of ceramic of the heating tube 1 at heat shock temperature of 500°C from an initial room temperature strength is set at 40% or above. If it exceeds over 40%, temperature in the incinerator possibly drop quickly when a larger quantity of incineration ash or outer air enters at the periphery in the incinerator.
Inventors:
Yuji Ogawa
Application Number:
JP37172398A
Publication Date:
July 28, 2004
Filing Date:
December 28, 1998
Export Citation:
Assignee:
Kyocera Corporation
International Classes:
F23G5/46; F23G5/00; F23G5/48; F28D7/12; F28F21/04; (IPC1-7): F28D7/12; F23G5/46; F23G5/48; F28F21/04
Domestic Patent References:
| JP1296088A | ||||
| JP6345555A | ||||
| JP8312924A |