In the boiler body of a fire tube boiler, there is a large diameter pot with a fire tube and a large number of thin tubes inside. The flue gas from the combustion of the fuel passes through a fire tube or pipe and is heated to a mixture of water, steam, or soda outside the fire tube or pipe. Fire tube boiler is also called boiler shell boiler. Due to the limitation of its structural conditions, it is generally used for users with small capacity. In the range of 1-20 tons of industrial boilers, more than 90% of users choose horizontal fire-tube boilers.
WNS series horizontal internal combustion three-return fire tube boiler is a kind of small and medium-sized oil-fired and gas-fired boiler with ZOZEN’s advanced experience and technology at home and abroad in recent years, which has been widely used in industry, family, hotel, hospital and other departments and places, and has been sold in Southeast Asia and other places. According to the different heating medium, WNS series horizontal internal combustion three-return fire tube boiler can be divided into steam boiler and hot water boiler. This type of boiler has stable quality and good technical performance. Many domestic boiler manufacturers all produce this type of boiler. It is a kind of oil-fired and gas-fired boiler with wide application, complete varieties and high efficiency.
Parameters of WNS series fire tube boiler
- WNS steam boiler: Rated evaporation capacity is 1 – 20 t/h, rated pressure is 0.7 – 2 Mpa, steam temperature is saturation or overheating temperature.
- WNS hot water boiler: Rated evaporation capacity is 0.7 – 14 MW, rated pressure is 0.7 – 1.25 Mpa, supply/return water temperature is 95/70℃, 115/70℃.
Features of WNS three-pass boiler:
- The flue gas flow generally adopts the three-pass arrangement, all-butt welding wet back structure, the furnace tube is a wave tube, the convection zone adopts the optimized combination form of threaded pipe and light pipe, the flue gas flow is long, and the heat transfer effect is good.
- Adopt advanced burners. At present, many manufacturers are equipped with burners produced in Germany, France, Italy and other countries, with advanced and perfect combustion technology, fast start-stop, low fuel consumption, high thermal efficiency, smoke and NO.
- All the emissions can meet the national standards.
- Equipped with perfect automatic control device, the boiler barrel water level, steam pressure, combustion and other automatic control and protection, to ensure safe and stable operation of the boiler.
- The boiler adopts combined-type quick installation structure, with compact and reasonable layout, light weight, less occupation of space, simple and quick installation and convenient maintenance.
- According to the requirements of users, the boiler can use oil, such as light oil, heavy oil or residual oil, but also various types of gas, such as natural gas, artificial gas, liquefied petroleum gas, etc. Two fuels may also be used simultaneously or interchangeably.
WNS series gas-fired steam boiler produced by ZOZEN boiler conforms to the strict environmental protection policy and rationally USES the low-nitrogen combustion technology to ensure the standard emission of nitrogen oxide. The gas boiler USES the waste heat in the flue gas discharged from the end of the boiler to increase the inlet temperature of the boiler and reduce the discharge temperature, so that the boiler thermal efficiency can be increased to more than 98%, saving the operating cost for customers. Our boilers are exported to more than 100 countries and regions, such as Philippines, Australia, Indonesia, and Colombia and so on. If you have any questions, please contact our online customer service.