Color coating line waste-gas-treating and heat-recovering method and system based on regenerative thermal oxidizer

Abstract

The invention discloses a color coating line waste-gas-treating and heat-recovering method based on a regenerative thermal oxidizer (RTO). The method comprises the steps: feeding the volatile organic compound waste gas with low temperature and low concentration discharged from a ground coating machine room and a face coating machine room to the absorption area of a concentration turning wheel through a low temperature waste gas pipe, so that the volatile organic compound waste gas is absorbed by an adsorbent of the absorption area; feeding the volatile organic compound waste gas with high temperature and high concentration discharged from a ground coating curing oven and a face coating curing oven to the RTO through a high temperature waste gas pipe; and feeding the mixing gas of the hot air adsorbed from the high temperature waste gas collecting pipe and the high temperature adsorption area of the concentration turning wheel to the RTO for burning, and feeding the discharged high temperature clean gas to a heat-recovering system, wherein the heat-recovering system comprises a high temperature hot air blower and a heat exchanger. Because the heat-recovering system is used, the color coating line waste-gas-treating and heat-recovering method based on the RTO is capable of saving a large amount of energy, and reducing the emission. In addition, the invention further discloses a system for color coating line organic compound waste gas innocent treatment and heat recovery.

Description

technical field [0001] The invention belongs to the field of color coating line production of steel plates in the metallurgical industry, in particular to the field of waste gas treatment of organic compounds (VOC) produced in the color coating line production. Background technique [0002] VOC is the English abbreviation of volatile organic compounds (volatile organic compounds). The US ASTM D3960-98 standard defines VOC as any organic compound that can participate in atmospheric photochemical reactions. They not only have a stimulating effect on various organs of the human body, but also have certain toxicity. The environment is extremely harmful. Among them, toluene and xylene are moderately toxic solvents in the classification of solvents, which have anesthesia and stimulation effects on the human body. Toxic to the nervous system in high concentrations. According to the latest research data, toluene and xylene will produce a certain photoelectric reaction after enteri...

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Problems solved by technology

[0005] Chinese patent CN103007682A discloses a paint shop exhaust gas treatment method and system based on a concentration rotor and RTO. This method uses a VOC concentration rotor and a regenerative incinerator RTO to treat VOC gas. Atmospheric gas, but this method needs to consume a lot of energy, and it needs to consume a lot of energy to generate hot air to heat the regeneration zone during the regeneration process of the runner

At the same time, the heat energy generated by the regenerative incinerator RTO is discharged into the atmosphere without being utilized, resulting in the waste of these high-grade energy

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