| 摘要 |
<p>PURPOSE:To securely melt burned ash. CONSTITUTION:In an ash melting furnace in which non-burned carbon C in burned ash such as urban dust, etc., is employed as a main melting heat source to melt burned ash A, there are provided a nontransfer type plasma torch 1 oppositely to burned ash As in the furnace and taking air as working gas, and control means 2 for actuating the plasma torch 1. The plasma torch 1 produces DC arc between electrodes.</p> |
