| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus capable of efficiently and economically treating heavy oil combustion exhaust gas emitted from a heavy oil burning combustion equipment and plan compact construction of the apparatus, reduction of consumption of chemicals, retardation of corrosion and prevention of both deterioration of performance and clogging caused by dust. SOLUTION: After heavy oil combustion exhaust gas has been subjected to denitrification treatment, the exhaust gas is introduced into an air preheating device 14 to recover heat, and then exhaust gas from which heat has been recovered is introduced into a heat recovery device 20a made of a heat-resistant acid-resistant synthetic resin made tube of a medium circulating type gas/gas heater 18a, e.g. Teflon tube heat recovering device, to be cooled, and then the cooled exhaust gas is introduced into a dust collector 16 such as a dry electrostatic precipitator, a bag filer and the like to be subjected to dust removing treatment and the dust removed exhaust gas is subjected to desulfurization treatment before being introduced into a reheating device 26 of the medium circulating type gas/gas heater to be reheated and guided into a flue 28. An interior of the heat recovery device 20a of the gas/gas heater 20 is divided into a plurality of partitions parallelly with gas flow and purified water supply pipes are respectively connected with the partitions to periodically wash the heat resistant/acid resistant synthetic resin pipe with water. |
