Feed water pre-heating
The feed water pre-heating is used to preheat the feed water in the feed water container and allows corrosive gases such as oxygen and carbonic acid to escape.
The JUMAG feed water pre-heating: Function and Benefit
What is the purpose of feed water pre-heating and what are its advantages?
Higher feed water temperature allows harmful gases to escape
The feed water pre-heating warms the feed water in the feed water container. This causes gases (oxygen and carbonic acid) which are harmful to the steam system to escape.
The feed water is heated by introducing steam produced by the steam boiler into the feed water container. The temperature of the feed water is measured constantly. If it falls below the target value, a steam valve opens and the water is heated. If it rises above the target value, the steam valve closes again.
Patented priority circuit
At higher steam consumption through the steam consumers, the feed water pre-heating should not put any more stress on the steam consumption. In this case, the supply of fresh, cold water is suppressed until enough steam is available again. If, however, a defined water level in the feed water container is undercut, fresh water is topped up. To avoid stress on the steam system, a second, lower target temperature is aimed for temporarily.
Mandatory when condensate return flow is low
Feed water pre-heating is always recommended to protect the steam system from corrosion. It is absolutely necessary, however, if no or minimal condensate return flow is available. To heat 100 kg/h of fresh water from 15°C to 95°C, approx. 10 kW or 14 kg/h of steam is required. This corresponds to approx. 14% of the steam output at 0% condensate return flow.