DRY AND WET HEAT SYSTEMS, AND USING COMPRESSED AIR METHOD

摘要

The present invention relates to a dry and wet heater and a method using compressed air and, more specifically, to a dry and wet heater and a method using compressed air, capable of rapidly performing hardening work for a tube by generating dry and wet heat composed of only compressed air without moisture under high temperature conditions in a short period of time while compressed air and steam are repeatedly circulated in a first circulation device, a dry and wet heater, and a second circulation device, and supplying to the inside of the tube installed inside the water supply and drainage pipe.