Boiler & Steam Generation

Firetube and watertube boilers heat water to produce steam. Steam is commonly used for humidification, sterilization, and for space heating for commercial and institutional applications. In industry, steam is commonly used for power generation, to drive turbines, and to heat and cool processes.

Steam generation occurs when pretreated water, whether it be via ion exchange and/or reverse osmosis along with returned condensed steam (condensate) is combined as boiler feedwater and heated to a temperature and at an operating pressure when boiling occurs inside of a pressure vessel. After the pretreatment step, the boiler feedwater is typically heated to just above the boiling temperature of water (212°F) and injected with steam (deaeration) to remove primarily dissolved oxygen along with other non-condensable gases. The mechanically deaearated water is collected in the storage section of the deaerator and the remaining dissolved oxygen is removed chemically with an oxygen scavenger. This boiler feedwater is then pressurized to above the operating pressure of the boiler system and used to replace any water leaving the boiler as steam or blowdown. The water is typically treated with sludge conditioning chemistry to prevent scale and deposition from occurring on heat transfer surfaces. Some common deposits are calcium carbonate and iron oxide. As steam leaves the boiler and enters the steam header, return line treatment is injected to neutralize any carbonic acid formed as carbon dioxide ionizes in the condensate.

AP Tech’s solid chemistry boiler products are designed for use in low and medium pressure boiler applications, and include all-in-one treatments, internal treatments, oxygen scavengers, amines, alkalinity booster, and cleaners. Many of the products are FDA-approved, NSF registered, and Kosher verified. 

The problems to address when treating boilers are: Corrosion and Scale.

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