SZS Gas Fired Double Drum Steam Boiler

Introduction of SZS Gas Fired Double Drum Steam Boiler

SZS gas fired double drum steam boiler is designed with longitudinal double drums and ” D ” type chamber structure. Furnace is placed on the right and convection tube bank is on the left, super heater is arranged at convection tube bank. The body is fixed on the basement by middle and both end flexible supports and make the boiler expand horizontally sideways. Around the furnace is membrane water cooling tube wall. Furnace and tube bank are totally separated by the membrane water tube cooling wall at the left side of the furnace. The back part of bundle is sparse shift structure, front part is aligned structure. Smoke from furnace outlet enters re-burning chamber, convection tube bank area and then from left front part enters spiral fine coil economizer and condenser, and finally is discharged to atmosphere through chimney.

Features of SZS Gas Fired Double Drum Steam Boiler

1. The key processing technology of steel and tube cutting, plate rolling and drum drilling, etc adopts advanced CNC machining process, which can decrease the assembly stress and prolong the working life.
2. By installing thermal insulation in the outlet of flue gas, we can reduce the boiler’s working noise.
3. All the convection tubes in high temperature area use vibrating-proof fastener to avoid the tube fracturing.
4. The inside of observation hole with moulding high-alumina refractory and manhole cover sealing treatment both completely resolve the overheat problem in these two zones.
5. Every piece of membrane wall between furnace and convection tubes is made by Cr25Ni20 high temperature resistance stainless steel. This can avoid the breakdown and short circuit caused by high temperature flue gas.
6. Impeller blasting and stoving varnish are applied to the boiler body to make sure the boiler look nice and has good antiseptic property.
7. We adopts advanced automatic unionmelt welding process to ensure the welding quality. All the vertical and circular welding seams will be inspected by 100% X-ray detection.
8. The manholes are designed at the two ends of upper and lower drums, and check door is set at the rear of boiler. These opening design make the maintenance and cleaning work convenient.
9. The water circulation is enforced in the high temperature zone, which ensures efficient cooling in heating zone and prevent vaporization.
10. Explosion door and flame sensor are designed in the boiler to make it safe and reliable.

Boiler Control And Protection System

1. Program function modularization and efficient interlocking alarm function;
2. Automatic start and load PID automatic regulation function;
3. Soft manual control function;
4. Automatic control function to water level (only for steam boiler);
5. Timing and antifreezing control function (only for hot water boiler);
6. Automatic control function to circulation water pumps (only for hot water boiler);
7. Burner fault interlock protection;
8. Fuel gas pressure abnormity fault interlock protection;
9. Fuel gas leakage interlock protection;
10. Water level and water shortage dual interlock protection;
11. Ultrahigh steam pressure dual interlock protection (only for steam boiler);
12. Ultrahigh exhaust gas temperature interlock protection;
13. Power-off fault interlock protection;
14. Extra-high water level fault alarm (only for steam boiler);
15. Water pump fault alarm;
16. Circulation water pump running interlock (only for hot water boiler);
17. Extra-high outlet water temperature interlock protection (only for hot water boiler);
18. Extra-high outlet water pressure interlock protection (only for hot water boiler);
19. Motor overload interlock protection (only for hot water boiler);
20. Ultrahigh furnace temperature fault interlock protection (only for SZS boiler);
21. Ultrahigh furnace pressure fault interlock protection (only for SZS boiler);

Working Principle