Fireproof structure and installation method for protecting water pipes

Abstract

A fireproof structure protects water pipes with stable durability even in a high temperature gas environment. Even in a case where it falls off, it does not leave the water pipes suddenly exposed. The fireproof structure for protecting water pipes 25B installed on water pipe walls of a combustion gas side is configured by a double-layered structure made up of an outer layer water pipe protective structure facing towards the combustion gas side, which is fireproof tile 13, and an inner layer water pipe protective structure provided between the outer layer water pipe protective structure and the water pipes, which is fireproof castable 12. The thickness ratio between the castable 12 and the tiles 13 lies within the range of about 2:1 to 3:1, and the ratio between the thickness of the fireproof castable and the radius of the water pipe is set to 1+α:1, wherein the value of α ranges from approximately 0.1 to 0.3. The water pipes are equipped with hanging hooks 15a for tiles 13.

Description

[0001] This is a divisional application of U.S. patent application Ser. No. 10 / 289,406, filed Nov. 7, 2002.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a fireproof structure and installation method for water pipes used in heat exchangers in incinerators, boilers and the like which protects them in high temperature gas environments. [0004] 2. Description of the Related Art [0005] Water pipes are installed inside of trash incinerators, boilers and the like to cool the high temperature gas environment or perform heat exchange. Those water pipes have been protected from not only the high temperature gas environment, but the abrasion from flying ash and corrosion, by the installation of fireproof tiles or fireproof castable structures around the inside of the furnace walls. [0006] Such conventional fireproof structures, as shown in FIG. 9, have studs 14 protruding from water pipes 10 on the combustion chamber side of the water pipe ...

AI Technical Summary

Benefits of technology

[0014] The present invention addresses the problems associated with the prior art. Its objective is to provide a fireproof structure for protecting water pipes and an installation method employing a fire proof structure which, even in the case where it falls off, does not leave the water pipes suddenly exposed, and even if the fireproof structure comes into contact with high temperature combustion gases, the fireproof structure assures protection for the water pipes and support members.

Problems solved by technology

However, the problem with the above described fireproof castable is that because it is of irregular dimensions, being coated or sprayed directly onto the walls of the water pipes, the durability of the resulting fireproof structure becomes unstable; after a few years, it tends to massively flake away or collapse.

With regard to the fireproof structure comprised of the externally formed and manufactured fireproof tiles described above, even though the tiles themselves have excellent durability, should any of them fall off, the water pipe can be directly exposed, and be damaged by the high temperatures and corrosive gasses.

In particular, when used in the stoker-type incinerators where the outlet temperatures can reach to an extremely high 1000° C., the difference between the thermal expansion of the support members for the fireproof structures using the foregoing fireproof castables or fireproof tiles, and that of the fireproof structure, causes cracks to form where combustion gases can invade and subsequently corrode the foregoing support members.

As a result, the foregoing fireproof structures are prone to separation and falling away, thereby allowing holes to form in the water piping.

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