The steam boiler with internal co mbustion three backhaul wet back qui ck form, can use light diesel o il, heavy diesel oil, city gas,  ;natural gas. Burning device imported&nbs p;brand-name burning machine with microco mputer automatic process control systems& nbsp;and combustion detector protection s ystem, equipped with high-efficiency pump s, valves, meters, and imports of&nb sp;soft water processor. Boilers under&nb sp;the protection of automatic ignition&n bsp;startup program, flame protection, lo ad regulation, high and low water&nb sp;level control, over-temperature overpressur e to achieve detection control autom ation. Boiler, with large water capa city and stable air pressure, is&nbs p;the ideal product which applied to the situation of large load ch ange, high steam quality, low exhaus t gas temperature, high thermal effi ciency.