LSB series vertical coal-fired environmental protection steam boiler adopts the most advanced combustion technology, the fuel from the fuel on the mouth into the grate combustion, translating into a gas. Flue gas in combustion chamber conversion last in bile into the upper, the automatic ignition system to produce high temperature flame, carried out on the heating surface radiation and convective heat transfer, including tiny carbon black in the flue gas and dust, rotate by multi-layer bundles cutting, burning again after purification of flue gas, the chimney into the atmosphere.