ZG is a steam boiler manufacturer in China.

21 MW Water tube hot water boiler

21 MW Water tube hot water boiler image

Capacity:21 MW SZS


Fuel:Natural gas, desiel oil, oil,et

Rated steam temperature: 184/194/204/214/224 ℃

Boiler feed water temperature: 20/60/105 ℃

21 MW Water tube hot water boiler introduction

21 MW Water tube hot water boiler adopts the structure of double longitudinal drums and D-type furnace. Water tube design, the economizer and other auxiliary heating surface are fixed in the rear. The combustor is located on the front wall. The convection tube bank and rear heating surface from the back of the furnace, and then into air through the chimney.

Body Structure Features:

For the double drums longitudinal D-type boiler, the pressure body has a good state of stress. Drums and other important pressure parts won't be radiated and eroded by high temperature flame. Pressure parts, with small thermal stress, can stretch out and draw back freely, and can reach higher safety margin. 
Auto protect, long-distance control, safety operation

21 MW Water tube hot water boiler parameters
Type WNS21
Output 21MW water tube hot water boiler
Outlet water Temperature 95℃/115
Rated steam pressure 0.7Mpa/1Mpa/1.25Mpa/1.6Mpa/2.45Mpa
Fuel Oil/gas fired
Feed temperature 70℃
Structure Water tube

Notice: As the company's products continue to improve parameters of the above products will be continuously updated page listed for reference only.

21 MW Water tube hot water boiler advantage

In order to improve heat efficiency of the boiler, steel tube economizer or steel finned tube economizer is laid in the back of the boiler body.

As the feed water temperature is high enough and flue gas temperature is still high, air preheater can be installed.

All rear heat recovery surfaces are the independent component, convenient to transport and install.


In short, D-type Water tube hot water boiler is featured by small heat storage, quick start, large load change range, short installation period, reliable operation, and little maintenance. And the matched self control part is of certain flexibility. Therefore, it is the ideal small and medium-capacity boiler popular among customers.

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