Boiler water circulation

In simple terms: the deionized water enters the deaerator to have its oxygen removed; it is then pumped by the feed pump into the air tank, and from there it is pumped by the circulation pump to heat exchange surfaces such as the membrane wall where it evaporates. After that, it returns to the air tank, where steam and water are separated before it goes back to the circulation pump for further circulation. The generated steam is delivered to the users via a gas holder.

Does a hot water boiler also supply water to users from the boiler drum?

The circulation pump in the pump room supplies water to the boiler; the boiler drum distributes this water to the lower collection box. The water from the lower collection box returns to the boiler drum’s distribution box via the water wall, and then reaches the tail heating surfaces before going to the outlet collection box. Whether it is supplied as hot water to users depends on whether your specific heating system is direct supply or indirect supply. The water supplied to the economizer is make-up water (softened water); the water that has been heated in the economizer is generally used as make-up water for the boiler

Let’s correct a mistake, or rather, a misconception – a common error among designers. Hot water boilers are typically equipped with two types of pumps: circulation pumps and make-up pumps. The filling of the boiler with water before it is started up is carried out using the make-up pump. Under normal operating conditions, the circulation pump remains active, while the make-up pump stops working and is used only when there is a lack of water in the system. Hot water boilers are divided into high-temperature and low-temperature types, depending on whether the water is supplied to users after heat exchange in a heat exchange station or directly. Whether the water from the water wall flows into the boiler drum depends on the specific design of the boiler; it may also flow into the header. The exact circulation path depends on the boiler’s structure, and it is not possible to draw a schematic diagram of it. The structure of economizers also varies; there are energy-saving devices used in gas boilers, as well as waste heat recovery systems that can be installed in all types of boilers. Any device that uses cold water to absorb heat falls under the category of economizers. These economizers are divided into pressurized and non-pressurized types, with the pressurized type being the one commonly referred to as an economizer. Water pumped by a water pump enters the economizer to absorb heat from the exhaust gases, and then this water is sent to the main body of the boiler. Non-pressure systems generally do not share the same circulation system as boilers; they form an independent circulation loop with the water tank and pump. That’s about all I know; please, the real experts, feel free to add or correct anything.

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