Series of DZL quick fitting boiler is the horizontal tri-returning water and fire pipes chain grating boiler, which uses medium quality soft coal. The boiler body is a single cylinder type, portrait arranged; there are left and right 2 rows of fire pipe bundles inside boiler cylinder to form convection heat receiving surfaces, the boiler cylinder to form convection heat receiving surfaces, the boiler cylinder and water cooling walls at both sides shape the furnace radiation heat receiving surfaces; the combustion equipment uses light chain grating ;exit shop in whole machine & quick fitting type. The electric control realizes grating step free timing, the extreme parameter alarm and inter-lock protection. Features of this series of boiler: compact structure, small volume ;convenient installation, cheap indamental construction; mechanized coal feeding and cinder removing; the output of the boiler is in sufficient and high efficiency .It is the well appreciated equipment for extensive steam supplying equipment for medium and small enterprises and public heating