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Introduction to the Natural Circulation and Forced Circulation Boilers

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Boilers can be classified according to the usage, pressure rate, working medium types, output states, boiler structures, fuel types, circulation types and others. According to circulation states, boilers can be divided into natural circulation boilers and forced circulation boilers.

An introduction of natural circulation boilers

In the boiler evaporation system, take the density difference between water in the downcomer and water-steam mixture in the ascension pipe as driving force to build up the circulation flow of working medium (water circulation) and cool up the heating surface.

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An introduction of forced circulation boilers

The working medium in the forced circulation boiler is not only powered to circulate by the density differences between water and steam, but also requires a certain pump work to circulate in the heating pipe. Forced circulation boilers include controlled circulation boilers, once-through boilers and combined circulation boilers.

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Product pictures

As a large-scale industrial boiler manufacturer, ZOZEN Boiler’s products cover four major series such as oil-fired (gas-fired) boilers, biomass-fired boilers, coal-fired boilers, thermal oil heaters and have over 400 boilers types. ZOZEN can provide customized boiler based on every customer’s requirements and provide the more cost-effective boiler system solutions.

Gas-fired(oil-fired) boilers
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Biomass-fired boilers
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Thermal oil heaters
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Cases

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    ZOZEN natural circulation gas-fired boiler used in food industry

    Project boiler medium:Steam
    Capacity:6tph
    Location: Dehui, Jilin
    Equipment:WNS6-1.25-Q

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    ZOZEN forced circulation thermal oil heater in Kazakhstan

    Project boiler medium:
    HMO (Heat Medium Oil)
    Capacity:4.2MW
    Location:Aktau, Zhanaozen, Mangistau, Kazakhstan
    Equipment:YQW-4200Q

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    ZOZEN natural circulation biomass-fired boiler in Thailand

    Project boiler medium:Steam
    Capacity: 20 tph
    Location:Thailand
    Equipment:SZL20-2.45-M

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    ZOZEN forced circulation hot water boiler in Mexico

    Project boiler medium:Hot water
    Capacity: 0.7MW
    Location:Mexico
    Equipment:WNS0.7-1.0/115/70-Q