Feed Water Preheating
Feedwater preheating serves to preheat the feedwater in the feedwater tank and allows the corrosive gases oxygen and carbon dioxide to escape.
JUMAG feed water preheating:
Function and benefits
What is the purpose of feed water preheating and what are its advantages?
Higher feed water temperature allows harmful gases to escape
Feed water preheating warms the feed water in the feed water tank. This allows gases (oxygen and carbon dioxide) that are harmful to the steam network to escape.
The feed water is heated by introducing steam generated by the steam generator into the feed water vessel. The temperature of the feed water is measured continuously. If it falls below the setpoint, a steam valve opens and the water is heated. If it rises above the setpoint, the steam valve closes again.
Patented priority circuit
When there is high steam consumption by the steam consumers, the feed water preheating should not further burden the steam consumption. In this case, the supply of fresh, cold water is stopped until sufficient steam is available again. However, if the water level in the feed water vessel falls below a defined level, fresh water is added. In order not to burden the steam network, a second, lower setpoint temperature is temporarily activated.
Essential for low condensate return
Feed water preheating is always recommended to protect the steam system from corrosion. However, it is absolutely necessary if there is no or only a low condensate return. 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.