Strip steel surface flame cleaning method and apparatus thereof

Abstract

The invention relates to a strip steel surface flame cleaning method and an apparatus thereof. According to the method, a strip steel enters a strip steel heat treatment furnace, wherein the strip steel heat treatment furnace comprises an inlet seal, a flue gas preheating section, a direct fire cleaning preheating section, an outlet seal and a heating section; the strip steel enters the flue gas preheating section through the inlet seal, is subjected to countercurrent heat exchange at the flue gas preheating section through flue gas from the direct fire cleaning preheating section, and then enters the direct fire cleaning preheating section, wherein combustion nozzles are arranged inside the direct fire cleaning preheating section, and the combustion nozzle jets high temperature impact flame; the strip steel is heated to a temperature of 300-400 DEG C under effects of combustion and impact of the high temperature impact flame so as to achieve uniform heating and clean residual oil and residual iron on the surface of the strip steel; and the strip steel finally enters the heating section through the outlet seal, wherein the spouts of the combustion nozzles are slit-shaped to form uniform strip flames, and the flames are perpendicular to the surface of the strip steel to form single surface or double surface heating of the strip steel. According to the present invention, non-oxidizing heating can be achieved through controlling flame atmosphere, and residual oil and residual iron on the surface of the strip steel can be cleaned by adopting effects of combustion and impact of the high temperature impact flame.

Description

Technical field [0001] The invention relates to metal surface cleaning technology, in particular to a flame cleaning method and device for strip steel surface. Background technique [0002] After rolling, a lot of dirt such as rolling oil, engine oil, iron powder and so on are usually adhered to the surface of the strip. In order to ensure the surface quality of the strip steel, the surface needs to be cleaned before the strip enters the heat treatment furnace or before coating. The surface cleanliness of the strip steel will significantly affect the surface quality of the finished strip steel. For example, the surface of the grease that is not completely volatilized will form carbides after annealing, which not only affects the appearance, but also makes the zinc layer poor adhesion; solid particle residues will Cause surface indentation and surface scratches. [0003] At present, conventional strip steel cleaning methods are usually a combination of chemical cleaning, electroly...

AI Technical Summary

Problems solved by technology

[0005] 1) A complex cleaning section is required, and the process equipment is complex. For a production line with a high unit speed, the cleaning section is relatively long;

[0006] 2) It needs to consume a lot of lye, water, etc., and discharge a lot of waste water, which is easy to cause environmental pollution

[0007] 3) High energy consumption;

[0016] 1) The temperature difference in the width direction of the strip is large, and the cleaning effect in the width direction is greatly different

[0017] 2) The flue gas flows parallel to the surface of the strip steel, the heat transfer and mass transfer coefficients are low, and the cleaning effect of grease and iron filings is poor

[0018] 3) It is difficult to adapt to the requirements of strip width and dimension changes

[0022] 2) High-concentration hydrogen is used for reduction in the reduction section, which requires high safety and consumes a lot of H2;

[0024] 4) There is no specific requirement for the type and function of the direct fire cleaning burner

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