Patent ID: 6237542
Filing Date: 2001-05-29
Classification: F22B,F22G,Y02E

Abstract:
A heat recovery boiler having an inlet side operatively connected to a combustion system and an outlet side operatively connected to an exhaust system, comprising:a casing;a superheater constituted by a pipe line in form of heat transfer pipe;an evaporator provided with a steam drum;an economizer, said superheater, said evaporator and said economizer being operatively arranged in the casing along a flow of an exhaust gas from the combustion system;a lead pipe connecting an inlet side of the pipe line constituting the superheater to the steam drum;a superheated steam pipe line connecting an outlet side of the pipe line constituting the superheater to the steam drum of the evaporator;a drain pipe operatively connected to the pipe line constituting the superheater; anda superheater bypass pipe incorporated with a superheater bypass valve and having one end operatively connected to the steam drum and another one end operatively connected to the superheated steam pipe.