Coal is illegality, you can use natural gas. We will match the gas burner for you. Please check the attached gas burner picture and installation worksite.
We mainly worry the heat temperature is not enough to drying raw material, drying effect is not good. After all, the distance is 100m, the temperature is low when it arrives rotary dryer. Last email I also said the max. distance is 20m to gurantee the temperature. If you insist use it, we can design for you.
By the way, do you have Skype or Wechat for better discussion?