DZL series coal-fired steam boiler-Fire tube boiler brands DZL series package boilers are horizontal three-pass water & fire tube boilers with a … the drum to form a convection heating surface, while the drum and the water walls … Steel tube cutting, thread tube pressing and convection tube processing all … The chain grate is manufactured by our factory, and it is tested for 72 hours … BOILERS | The quantity of the steam produced is indicated in tons of water evaporated to steam … Fire tube boilers, typically have a lower initial cost, are more fuel efficient and … power station boilers use pulverized coal, and many of the larger industrial … More details about FBC boilers are given in Chapter 6 on Fluidized Bed Boiler.