Casting technology is a manufacturing process in China and other countries around the world. In recent years, the foundry industry has made great progress and development. However, while the foundry industry is developing, enterprise casting processes still face two major problems: environmental pollution and energy conservation and emission reduction. Most of the ventilation equipment used in casting production in China now adopts old or outdated dust removal methods. Due to the characteristics of casting operations, the amount of dust and smoke is large, and the temperature of the flue gas is high. Seriously, some domestic foundries still use dust removal equipment from the 1950s, which generally suffer from poor dust removal efficiency, serious leakage, difficulty in repairing and replacing filter materials, large appearance, and high energy consumption.

The reasons why several mainstream technologies cannot operate up to standard at present are: method phenomena, main reasons, other reasons, and failure reasons

After five or six months of UV photolysis, the lamp tube failed due to insufficient attenuation power and poor maintenance, resulting in surface contamination of the lamp tube. The internal filament metal evaporates and absorbs 185nm ultraviolet light.

The low-temperature plasma method fails after two to three months, and the plasma generator is poisoned by plasma polymerization, causing salts, substances, ammonia, and other substances to polymerize on the generator, changing the properties of the medium. Unknown, a global challenge.

The principle error of ineffective water spray is that most odors other than ammonia are insoluble in water, and the principle error is only suitable for removing particulate matter and cannot remove odors.

The masking method (such as spraying plant liquid) increases the concentration of substances without removing odors or damaging substances, while substances such as plant liquid increase the concentration of VOCs and deceive the nose. In fact, the concentration of foul odor has increased

After two to three months, the biological method becomes ineffective due to blockage or short circuit of the gas path, decay, bacterial contamination, insufficient nutrients, intermittent work, water shortage, high or low concentration, and toxic substances in the gas. Organisms require nutrition. Organisms require competitive variation. Support object malfunction. Mass transfer process obstructed

6. Activated carbon will fail after a few weeks, reaching saturation through adsorption saturation

7. The acid-base spray effect is not ideal, and the kinetic constant is too small. Continuous dosing and treatment of waste liquid are required, as well as maintenance of equipment corrosion. Requires a residence time of 20-30 seconds. For high air volume and low concentration gases, the reactor is too large. The operating costs are high.

Waste gas treatment in the foundry industryIt is a new type of purification equipment for dry treatment of exhaust gas, which changes the process technology of using activated carbon materials. It does not require the treatment of raw materials, does not require dedicated personnel to be responsible, does not generate secondary pollution, and is easy to replace and maintain. It is a technology in the treatment of exhaust gas in recent years. Plasma is known as the fourth form of matter, composed of electrons, ions, free radicals, and neutral particles.

Waste gas treatment in the foundry industryIncluding suction collection hood, exhaust gas collection pipeline, low-temperature plasma+composite photocatalytic industrial exhaust gas purifier, and main fan, several suction collection hoods are set on the casting production line according to the number of exhaust gas sources in casting production and are connected to the inlet end of the exhaust gas collection pipeline. The outlet end of the exhaust gas collection pipeline is connected to the inlet of the purifier, and the outlet of the purifier is connected to the atmosphere through the exhaust device. Solved the collection and treatment of dust and exhaust gas during the casting process, as well as the complex treatment process of existing wet treatment of casting exhaust gas.