Grouting method for blast furnace

Abstract

The invention relates to a grouting method for a blast furnace, aiming to enhance the grouting success rate of the blast furnace. In the invention, the temperature of a furnace shell of the blast furnace is measured by using infrared imaging scanning and an infrared temperature measuring instrument to find out the position with relative high temperature; the position is taken as a datum point, holes are bored at vertical or transverse interface parts between two cooling walls or among three cooling walls which are adjacently installed at the upper side, the lower side, the left side and the right side; a hollow drill is used to drill through the furnace shell firstly, then drill through fillers between the furnace shell and the cooling wall, continuously drill a hole forwards to drill through the cooling wall, and then drill through unshaped ramming materials or pouring materials between a brick lining and the cooling wall; a drilling channel is cleaned; a grouting channel is dredged,lubricated and preheated; and an amount upper limit value of grouting is controlled to be 60 kg to 120 kg; proper grouting pressure is ensured, when the brick size of the brick lining is small and isnot provided with a brick locking groove, the grouting pressure is relative low to be generally controlled to be 1.0 MPa-1.5 MPa, and when the brick size of the brick lining is large and is provided with the brick locking groove, the grouting pressure is relative high to be generally controlled to be 1.0-3.0 MPa.

Description

technical field [0001] The invention relates to a blast furnace grouting method. Background technique [0002] After the blast furnace is put into production, due to frequent wind shutdowns, such as planned maintenance and replacement of tuyeres, etc., the lining will expand with heat and contract with cold, causing gaps between the lining and the cooler, affecting heat conduction, and generating gas channeling, resulting in furnace The shell temperature rises and gas leaks, so it is necessary to try to pour mud into the gap between the blast furnace lining and the cooling wall to block the channel of gas channeling. The main defect of the existing grouting method is that the grouting hole is not positioned accurately, and the position where the void is generated cannot be accurately positioned; the grouting material has an unreasonable particle size composition, insufficient fluidity, and poor mixing of the grouting material, resulting in the grouting process. The grouting...

AI Technical Summary

Problems solved by technology

The main defect of the existing grouting method is that the grouting hole is not positioned accurately, and the position where the void is generated cannot be accurately positioned; the grouting material has an unreasonable particle size composition, insufficient fluidity, and poor mixing of the grouting material, resulting in the grouting process. The grouting hole channels and gaps flow and infiltrate, and the grout cannot smoothly block the blow-by air gap between the brick lining and the cooler; the debris particles in the grouting holes are not cleaned, and these debris particles can easily block the grouting channels and tiny Gap, so that the grout can not be successfully filled into the tiny gap between the brick lining and the cooler; when the grouting holes are reused for grouting, the semi-solidified or solidified grouting pipes and grouting channels left in the last grouting cannot be dredged grout, so that the new grout cannot reach the tiny gap between the brick lining in the furnace and the cooler