How many coal feeding holes does a 3.6 meters tunnel kiln need? 
For the tunnel kiln, the length is 134.2m, and the size of kiln cart is 2.9*3.66*0.84m. Coal feeding holes are arranged in the high-temperature section usually between 19th cart and 29th cart, about 24 columns. Each column has 4 holes, total 96 holes or 4 or 5 holes staggered, total 108 holes.