Blast furnace online small-bore micro-damage furnace hearth side wall temperature detection method

Abstract

The invention provides a method for detecting temperature of the side wall of a small-bore micro-damage crucible of a blast furnace on line, and belongs to the technical field of blast furnace smelting crucible detection. The detecting method comprises the following steps that: 1) a blast furnace to be detected comprises a furnace shell, a cooling wall and carbon bricks, and padding is filled between the furnace shell and the cooling wall and between the cooling wall and the carbon bricks respectively; 2) detecting points and depths of the detecting points are determined, the detecting points are respectively distributed in clearances of the cooling wall on the side wall of the crucible, and the depths of the detecting points are determined according to a medium to be detected and the thickness of the medium; 3) the surface of the furnace shell of the crucible to be detected is provided with horizontal holes according to the detecting points and the depths of the detecting points determined in the step 2); 4) a thermocouple with a sheath is placed in a horizontal hole, a sealing element is fixed on the furnace shell, and the thermocouple with the sheath is fixed on the crucible to be detected; and 5) the thermocouple and PLC are connected through a thermocouple lead wire to realize real-time detection and acquire solid temperature variation gradient. The method has the characteristics of simpleness, convenience, reliability, less investment, less maintenance and installation without blast furnace overhaul.

Description

technical field [0001] The invention relates to a method for detecting the temperature of the side wall of a small-aperture micro-damage hearth of a blast furnace on-line, and belongs to the technical field of hearth monitoring for blast furnace smelting. Background technique [0002] The hearth bottom of a blast furnace is a restrictive link that determines the lifetime of a blast furnace. The monitoring of the furnace body above the hearth has successful experience at home and abroad. However, due to the particularity of its location and structure, the hearth hearth is eroded. Research is a hot and difficult issue. It is understood that there are currently devices and methods for furnace lining erosion monitoring, erosion thickness measurement, and continuous temperature measurement. Optical fibers, thermocouples and other components are used to measure medium temperature and calculate cooling wall temperature and flow parameters to realize hearth erosion. The purpose of ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the monitoring components must be pre-embedded during new construction or overhaul and cannot be maintained and replaced daily, and provide a simple, reliable, low-investment and maintenance-intensive blast furnace on-line system that can be installed without blast furnace overhaul. Method for detecting side wall temperature of furnace hearth with small aperture and micro damage

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