Effective heat recovery and corrosion prevention method and apparatus of waste heat recovery heat exchanger

摘要

The present invention relates to an efficient heat recovery and corrosion prevention method and apparatus for a waste heat recovery heat exchanger, and more particularly, to a method and apparatus for efficiently recovering waste heat and preventing corrosion of a waste heat recovery heat exchanger using waste heat generated in a place where a furnace temperature is high, The heat exchanger is installed for use of heat, which is suitable for high heat recovery efficiency and corrosion prevention of the heat exchanger. Such a conventional waste heat recovery method uses a means for preheating the combustion air using a heat exchanger.;However, in this conventional method, since the surface temperature of the bundle tube reaches the dew point temperature of the waste gas and the low temperature corrosion phenomenon where corrosion occurs in the bundle tube is generated, the thermal efficiency is gradually decreased and the corrosion of the apparatus is accelerated, There is a problem that it must be replaced.;Accordingly, in order to fundamentally solve the above-described problems, the present invention preheats the incoming air to the heat exchanger by using the preheated or preheated inflow air to flow the air above the dew point temperature at all times, In order to accomplish the above-described method, the present invention provides a heat recovery apparatus in which a plurality of heat exchangers having a bundle tube in an exhaust pipe are vertically arranged, and a venturi tube is formed in an inlet air tube at a normal temperature And the control valve for the temperature sensor and the bio-path pipe is controlled to be variable in the front side of the venturi tube through the bypass pipe from the air pipe line preheated by the waste gas or heat exchanger through the bypass pipe, Respectively.