ZOZEN ZZ series water tube steam boiler adopts the "D" type structure. The furnace is on the right side and the convection tube bundle is on the left. Around the furnace is the membrane water wall. The boiler is equipped with an advanced burner, an economizer and a condenser, which can improve the thermal efficiency to more than 98% and reduce the NOx emission to less than 30mg/Nm³. With an automatic control system, the boiler can achieve unattended operation.