Steam Boiler

Product Details

Main  Technical Parameters

 Structural  Principle

WNS series oil (gas)-fired steam  boiler is a novel one developed on the basis of foreign advanced technology in  combination with the domestic development situations. Assessed by domestic  experts, its comprehensive technical performances reach the domestic advanced  level.   

This type of boiler mainly consists of  the shell, internal furnace, tube plate, smoke tube, backflash chamber and  furnace burner. The boiler of evaporation capacity ≥2t/h adopts corrugated  furnace and full-wet-back three-return strokes. The corrugated furnace can  increase the furnace heating-surface, improve heat-exchange efficiency, adapt  the boiler for thermal expansion and prolong service life of the boiler. The  boiler of evaporation capacity ≤1t/h adopts thread pipe backflash type. The  thread smoke tube can disturb gas laminar flow, enhance gas heat-exchange  coefficient and thus render the boiler high thermal efficiency and extra high  overload capacity. The designed diameter of the furnace is larger than that of  the routine boiler so as to suit for burning of various kinds of fuels. The  furnace burner is at the front of the boiler and the burning is under the slight  positive pressure mode, with the flame passing through from the furnace, smoke  tube to gas plenum. This type of layout is rational in structure, complete in  burning, and high in thermal efficiency and good in safety, and makes the  emission of dust and noise much lower than the state standards.  

Performances and  Features

1. Main unit

This type of boiler adopts  foreign-advanced furnace burner, which is ignited with automatic electronic  mode, and the fuel is mechanically injected under high pressure. Its air  flowrate is automatically adjusted in proportion and each action controlled with  a programmable controller. Hence, it is high in automation degree, fast in  booster of steam, and good in fuel oil atomizing degree and in thermal  efficiency.  

2. Feedwater system 

It is automatically controlled with  domestic advanced electronic detection circuits and the pump is stopped at high  water level and started at low water level. It is also provided with indication  units for low, normal and dangerous water levels respectively (with ultra-high  water level alarm for boilers ≥2t/h). The dangerous water level is interlocked  with the burner. In case of dangerous water level, the alarm will be sent out  and the burner stopped to avoid damage due to lack of water.  

3. Fuel feed system 

If 0#-10# diesel or heavy oil is used  as the fuel，the oil-feed pipelines are fixed with  4 filtering units to keep the fuel clean. When heavy oil is used, a preheating  unit shall be additionally installed on the pipeline. If natural gas is used,  the bore of pipeline and gas supply pressure shall be correctly selected in  accordance with the fuel manual.   

4. Over-pressure protector (two  types)

(1)   Pressure controller: If the pressure  exceeds the intentionally preset working pressure (but shall not exceed the  rated working pressure), the contacts of the pressure controller will trip to  disconnect the burning-interlocked control circuit and stop the furnace burner,  and meanwhile send alarm to warm the operator to eliminate the faults. The  boiler of capacity ≥6t/h are additionally fixed with steam over-pressure alarm  and interlocking protector. 

 (2)   Spring type safety valve: When the  steam pressure inside the boiler reaches the preset working pressure, the safety  valve will automatically open to discharge steam outwards so as to ensure safety  of the boiler.   

5. This type of boiler occupies less  space, is easier, safer and more hygiene in installation and operation than  coal-fired boilers. They are widely used in enterprises, institutions,  hospitals, schools, hotels and households, being an ideal substitute for the  coal-fired boilers.   

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