Comet Chemicals

Ghatlodiya, Ahmedabad, Gujarat

In any cooling process water takes heat from process and cools the system. By the way it gets heated up and in turn it need to be cooled to reuse the same. It gives up the heat through a process called evaporation. Once through systems normally present nearby a sea or river. In this system water is drawn from the source and pass it through the system once and discharge it back into the source. In closed recirculating system water is recirculated continuously.

In this program chelating agents viz., EDTA, NTA, etc., are added to feed water. These salts form water soluble complexes with calcium & magnesium and prevent them from precipitating. In case they form scales, these salts de-stabilizes the crystalline growth. This system of treatment is discouraged as the salts may carry over with steam and break into acidic components which may cause corrosion in post boiler sections. This method of treatment is implemented in boilers having operating pressure within 20Kgscm2 where soft & raw water are used as boiler feed water. The above treatment should be used in conjunction with polymeric sludge conditioners for better results. In this method of treatment precipitation of calcium & magnesium, either partially or completely, are induced by maintaining higher pH & higher alkalinity. The residual hardness, if present, should be controlled with the addition of polymeric sludge conditioners.

In this program chelating agents viz., EDTA, NTA, etc., are added to feed water.These salts form water soluble complexes with calcium & magnesium and prevent them from precipitating. In case they form scales, these salts de-stabilizes the crystalline growth.This system of treatment is discouraged as the salts may carry over with steam and break into acidic components which may cause corrosion in post boiler sections.

Boiler water contains suspended particles like precipitation of calcium, magnesium, silica, etc. These salts flock together and settle down at the bottom of boiler drum, low velocity areas, may adhere to boiler tubes to form a scale.To prevent the above problem, a medium molecular weight polymeric dispersant is added. This dispersant gives same ionic charges to the precipitated salts, due to which repulsion occurs among the particles. Hence all these suspended matter is kept in kinetic motion and can be removed freely through blow down.