Security heating method for color-coating line paint curing oven

Abstract

The invention provides a safe heating method for a color-coating line paint curing oven. The method adopts a double safe operation mode for the simultaneous control of the blast volume for safely discharging waste gas with rich solvent in a curing oven and the content of oxygen in the curing oven; a fan with the safe blast volume pumps out the waste gas in the curing oven to ensure that the content of the organic solvent in the curing oven is lower than one fourth of the lower explosive limit, so the explosion can be avoided no matter what content of the oxygen in the curing oven is; the waste gas is completely incinerated and pyrolyzed in an incinerator for removing the poisonous organic matter in the waste gas, and the content of remained oxygen in the gas after combustion is controlled under 5 percent during incineration, so explosion is avoided again because the content of the organic solvent is always out of the explosion range due to the shortage of oxygen gas no matter how partial organic solvent changes; and the high-temperature waste gas is directly delivered back to the curing oven after utilized through a plurality of heat exchangers, so that the content of oxygen in the curing oven is controlled. The invention not only solves the problem of environment pollution but also can fully utilize energy to solve the problem of heat source supply in color-coating line production.

Description

technical field [0001] The invention belongs to the field of waste gas utilization and production of color coating lines for steel plates in the metallurgical industry, and in particular relates to the production field of harmful gas treatment of color coating line curing furnaces. Background technique [0002] The color-coated board production line generally adopts the heating and drying method after applying liquid paint. The solvent is heated and evaporated by the heat in the curing furnace, and the strip is heated to a predetermined temperature to cure the coating. This process consumes a lot of energy. At present, in order to meet environmental protection standards, the domestic color-coated board production line generally extracts the exhaust gas in the furnace and heats it to the temperature of the cracking point of the exhaust gas (733°C) for cracking and incineration, and then discharges it into the atmosphere through the flue, exhaust fan, and chimney to achieve sta...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of large energy consumption, many burners and waste of heat energy in the original waste gas treatment, the present invention adopts the method of combining the organic solvent concentration control and the oxygen content control in the furnace, and directly recycles the exhaust gas after thorough treatment. It achieves the effect of further improving the safety of the system and reducing energy consumption, and reduces the investment in combustion equipment

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