Gas steam generator Water is indispensable for the operation of, Steam generator Scaling is inevitable during long-term operation. Once scale is formed, it will lead to vertical Gas steam generator equipment The thermal efficiency of the steam generator will be reduced if the heat transfer performance of the steam generator becomes worse; Scale may also cause furnace tube bulge and explosion; The poor heat transfer will increase the operating cost and reduce the service life of the steam generator. So how to deal with water in gas steam generator? Before treatment, it is necessary to know how scale is formed? Then we can have targeted solutions.

Causes of scaling in gas steam generator

(1) Carbonate and sulfate scale

The formation of carbonate and sulfate scale is due to the existence of calcium and magnesium salts in boiler feed water. The solubility of carbonate and sulfate will decrease with the increase of temperature, and scale will be precipitated to a certain extent. Carbonate scale is generally formed in places where heat is not strong; Sulfate salt scale usually precipitates at high temperature, often on the heating surface with strong heating, and is very common in water wall tubes and convection tube bundles of boilers.

(2) Silicate scale

The chemical composition of silicate scale is mainly aluminum and iron silicates. Its chemical structure is relatively complex. This scale is hard and has poor thermal conductivity, so its harm is relatively large. It is generally formed in boiler tubes with high heat load.

(3) Iron oxide scale

Iron oxide scale is mainly composed of iron compounds. Under normal operation of the boiler, the oxygen content in the water is very low, which will not cause oxygen corrosion to the boiler. However, if the dissolved oxygen in the water increases, it may cause oxygen corrosion on the metal surface, generate iron oxide products and dissolve in the boiler water, and gradually form iron oxide scale under the action of high temperature.

Due to the different water quality, the cleaning effect will be different. We usually use alkali cleaning and acid cleaning to complete the cleaning. First, use hydrochloric acid and corrosion inhibitor in the tank to better clean the rust scale, and then use alkaline boiling to transform sulfate and silicate to achieve cleaning. Although this cleaning method is simple, hydrochloric acid will be corrosive to metals to a certain extent. Pay attention to the amount of hydrochloric acid used. However, the use of gas steam generator depends on daily care. It is suggested to use soft water, which can effectively reduce the calcium magnesium ion crystallization precipitation and prolong the service life.

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