A semi-cast blast furnace hot blast stove pipe and its construction method

Abstract

The invention discloses a semi-cast blast furnace hot blast stove pipe. The semi-cast blast furnace hot blast stove pipe comprises a steel shell composed of an upper steel shell and a lower steel shell; a masonry structure layer is laid in the lower steel shell; and an integrally-cast castable layer is arranged in the upper steel shell. The invention further discloses a construction method of thesemi-cast blast furnace hot blast stove pipe. The method comprises the steps that a whole reserved casting hole is sprayed; a fiber felt layer, an insulating brick layer and a working lining brick layer are sequentially laid on the surface of a sprayed layer of the lower steel shell; fiber felt layers are sequentially laid on the surface of the sprayed layer of the upper steel shell; an upper steel shell casting template is mounted; an expansion gap template is mounted; and casting construction is conducted. The pipe and the construction method have the beneficial effects that a lower lining of the hot blast stove pipe adopts a traditional masonry material and a traditional masonry method, an upper lining is casted and molded by casting a castable once, gaps in traditional pipe structurescan be reduced, a weak area is avoided, and the phenomena of sinking, breaking or even collapse of upper brick linings which often occur in the using process of the hot blast stove can be effectivelyavoided.

Description

technical field [0001] The invention relates to the technical field of blast furnace supporting equipment, in particular to a semi-cast blast furnace hot blast stove pipe and a construction method thereof. Background technique [0002] Blast furnace supporting equipment Hot blast stove is a kind of high temperature and high pressure equipment, the design life is generally 20 to 30 years. With the advancement of blast furnace ironmaking technology, high wind temperature, high wind pressure, high oxygen enrichment, and large blowing operation systems are more and more adopted and promoted. The problem of damage to the upper lining of the hot blast pipe is becoming more and more frequent and often occurs. Deformation, cracking, falling of bricks, or even collapse will cause dangerous hidden dangers such as air leakage, local overheating, redness and deformation in the upper part of the hot air duct, and even vicious accidents such as burn-through and bursting, which seriously a...

AI Technical Summary

Problems solved by technology

With the advancement of blast furnace ironmaking technology, high wind temperature, high wind pressure, high oxygen enrichment, and large blowing operation systems are more and more adopted and promoted. The problem of damage to the upper lining of the hot blast pipe is becoming more and more frequent and often occurs. Deformation, cracking, falling of bricks, or even collapse will cause dangerous hidden dangers such as air leakage, local overheating, redness and deformation in the upper part of the hot air duct, and even vicious accidents such as burn-through and bursting, which seriously affect the safety and security of steel smelting enterprises. The service life of the hot blast stove has become one of the key factors restricting the development of ironmaking

[0003] Hot air duct damage occurs frequently. In addition to material quality and masonry quality, it is mainly affected by the structure. The traditional hot air duct is lined with brick rings, and there are structural gaps between the rings. The gaps are hot air. The weak area of ​​the pipeline, and the connection parts such as the hot air outlet and the Sanchakou are built with composite bricks. The production process of composite bricks is complicated, time-consuming and laborious, and the overall structure formed by the masonry often shrinks and the bricks are not tight under various thermal stresses. , the upper composite brick is loose, resulting in wind blowing, collapse, etc.

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