D type structure that adopt double drum layout, the burner fix up in front wall of furnace vertically. And the convection bank between the water and steam drum are vertical tubes, belongs to natural recycling, is a typical natural water circulation and high reliability structure, it has high self compensation, the character of up and down proportion automatic assignment, consequently the water cycling is safe and reliable. Convection bank enormously increased boiler evaporate heating surface, which can reduce the smoke temperature the in economizer entrance below to a lower level 300 º C (see below thermal calculation summary sheet), so it can organize economizer heating surface easily, ensure economizer safety. At the same time because they use a lot of convection bank heating surface, the boiler have the stronger overload ability.
Example: SZS16-1.0/210-Q technical parameters 1. Rated evaporation capacity: 16t/h 2. Working pressure: 1.0MP 3. Rated steam temperature: 210º C 4. Heat efficiency: 88.2% 5. Rated gas consumption: 1214Nm3/h(gas as 35588KJ/Nm3) 6. Transport dimension: 7.73× 3.85× 3.6(length× Width× Height) 7. Transport weight: 30T 8. Temperature of drain gas: 150º C 9. Main steam pipe drift diameter: DN200 10. Discharge pipe drift diameter: DN50 11. Water supply pipe drift diameter: DN80 12. Safety valve tube base: DN100(2).