Problem
Metal recycling is a fundamental pillar of a modern circular economy that conserves natural resources, reduces energy requirements, and avoids the loss of valuable materials. The recycling of electrical equipment places special demands on the process due to the complex structures and material compositions, while the processing requires special technologies. A common problem in the treatment of complex recycling materials is hot, toxic combustion exhaust gas, contaminated with suspended solids, that clogs the flue gas duct after heat treatment. The clogged ducts then have to be laboriously cleaned manually, with the toxic deposits posing a risk to employees. Extreme protective measures for the cleaning staff are essential.
Solution
To solve this problem and optimize the process, the Martin® Hurricane Air Cannon with "positive pressure firing" technology was used. Several air cannons are arranged in series and are fired successively. This solution ensures effective removal of flue gases and suspended particles from the flue gas duct and transport of the flue gases to the filtration system. This prevents the duct from becoming blocked by an increasing buildup of material. It also increases employee safety by minimizing the risk of accidents and damage to health. Any cleaning inside the exhaust duct by employees has been reduced to a minimum. The positive-acting valve enables the control solenoid valve to be positioned in a safe location up to 60 meters away from the tank.
Results
The use of the air cannon in the flue gas duct not only improves process efficiency, but also increases the availability of the entire recycling system and significantly increases the available operating time. The solenoid valve cabinet was positioned away from the 'harsh' environment around the air cannons to a 'safe' environment some distance away meaning environmental conditions have no influence on the solenoid operation. The air cannon was easily integrated into the existing system and is simple to operate. Thanks to its robust design, it is ideal for the demanding recycling environment.