... flame powerful 2 not hurting kiln coating 3 low expense of after-sales service. Gas Burner With Newest Technical Craft FeaturesPulverized ... such below features: sufficient burning, flame powerful, strong, not hurting kiln coating, repairable , low expense of after-sales service. And the ... Ringelmann 0-1 degree level;2. pulverized coal burner with a fixed carbon content of ash in about 0.1 percent, ...