This gas boiler consists of threaded firetubes, corrugated furnace, boiler shell, insulation lay, stainless steel coat, instrument valves and an integral burner.
 

• The key processes including material cutting, rolling, drilling are made by advanced CNC machining process to reduce the assembly stress and extend boiler working lifetime. 

• The front and back smoke chamber plates are cut by CNC plasma cutting machine with tidy and beautiful look.

• Fully intelligent operation, with automatic adjustment and protection of burning, water level, temperature and steam pressure. The smoke box door uses the hinge structure for easy inspection, inventory and cleaning.

• The way to weld Smoke tube and tube sheet is to first expand to eliminate the gap between them, then adopt automatic argon arc welding to relief the stress and expand boiler service life.

• Longitudinal and girth joint adopt advanced automatic submerged-arc welding for good welding quality. All longitudinal and girth joint are test by radiographic inspection.

• Fin tube uses ND steel or stainless-steel material to avoid corrosion in the low temperature .

  Inspection stops are set up to guarantee the sequence of expanding and welding to avoid cracking of the tube sheet holes.

• High quality aluminum silicate fiber is used with fire clay insulation, to control the boiler body temperature below 45ºC and reduce heat lost.

• Sufficient steam storage room and heating area to generate high quality steam and high thermal power.

• Condenser is added to recycle the waste heat of the exhausted smoke to increase feeding water's temperature and reduce flue gas emission temperature and increase the thermal efficiency over 95% and save operating cost.

1.1 Long working life
3-pass and wet-back are designed to avoid the damage of back tube sheet from the high temperature smoke.

1.2 Compact desegn

Threaded firetube and corrugated furnace are used to increase the heating area. That allows over 30% of the energy to be absorbed in the furnace. This means a shorter boiler overall. Definitely, it can save your boiler room construction costs.

1.3 New type economizer
It is made by finned ND tubes. It is smaller but the heat exchanging area is bigger than normal. By calculation, It can save around 5% fuel.

1.4 Low emissions
Lowering emissions in the ZOZEN-WNS series of boiler involves two key factors:
(1) advanced burner solution;
(2) the proper sizing of furnace to minimize nitrogen oxides and other contaminants from forming during the combustion process.

1.5 Safety control system
We design the safety interlock system with multiple protection and alarm functions
- Protection program of automatic ignition
- Locking and protection program of operation
- Protection program of extinction
- Protection program of completion
- Protection program of water pumps (pressure loss)
- Protection program of ignition failure
- Protection program of combustion engine malfunction
- Protection program of combustion engine flameout
- Sound-light alarm of high pressure
- Sound-light alarm of high limit water level
- Sound-light alarm of low limit water level
- Sound-light alarm of super-high temperature of hot water

2. Our market in the world



Nowadays, we have exported our boilers to the following countries: India, Indonesia, Pakistan, Malaysia, Thailand, Laos, Vietnam, Bengal, Philippines, Taiwan China, Papua New Guine, France, Finland, Turkey, Serbia, Lithuania, Bulgaria, Russia, Mongolia, Venezuela, Chile, Colombia, Mauritius, South Africa, Ethiopia, Algeria, Nigeria, Tanzania, Oman, UAE, etc.

3. Total Integration goes far beyond boilers

Efficiency and quality don't end with our boilers. ZOZEN complete integration produces the most efficient boiler solutions in the world. Completely designed, engineered, manufactured, integrated, and serviced by our team, our systems don't have a single outsourced component to jeopardize compatibility or performance. If you are looking for the best-quality boiler systems with the lowest emissions and highest efficiencies, you are looking for Zozen.

4. Boiler specification