Water softener for low-pressure boiler and heat exchange system and use method thereof

Abstract

The invention belongs to a water treatment technique, and relates to a water softener for a low-pressure boiler and a heat exchange system and a use method thereof. The softener is an aqueous solution consisting of phytic acid, caustic alkali, carbonate, a deoxidant, a flocculant and an accelerator and comprises the following components in mass fraction: 300-500 of phytic acid, 220-550 of caustic alkali, 0-300 of carbonate, 0-30 of accelerator, 0-50 of flocculant, 0-200 of deoxidant and 300-500 of water. The preparation method of the softener comprises the following steps: firstly dissolving the phytic acid in the water; then slowly adding the caustic alkali, the carbonate, the accelerator, the deoxidant and the flocculant while stirring; and stirring evenly and cooling to room temperature, so as to obtain the water softener. The adding amount of the softener is 30-100g / m<3> water, and the pH of the water is controlled at 8.0-10.0. The water softener has descaling, antiscaling and corrosion-inhibiting functions and wide adaptability; and used raw materials have no secondary pollution on environment.

Description

technical field [0001] The invention belongs to water treatment technology, in particular to a water softener for low-pressure boilers and heat exchange systems and its application method. Background technique [0002] The hardness of hard water is divided into temporary hardness and permanent hardness. Temporary hardness is mainly caused by calcium bicarbonate or magnesium bicarbonate, while permanent hardness is caused by sulfate or chloride of calcium and magnesium. Although hard water does not cause direct harm to health, it can cause great harm or even danger in industry. It can easily lead to scaling in the heat exchange system, corrosion of base metal, and deterioration of steam quality, which directly affects the heat transfer effect of the boiler and heat exchange system. , reduce efficiency, and even cause a pipe burst accident in severe cases. In order to prevent fouling, salt accumulation and corrosion of the boiler and heat exchange system, the hardness of the ...

AI Technical Summary

Problems solved by technology

The Chinese patent with the application number 95104277.7 discloses a new type of scale inhibitor and dispersant for water treatment. The disadvantage is that it does not have corrosion inhibition performance. To achieve scale and corrosion inhibition effects, it must be used in combination with other corrosion inhibitors; the application number is The Chinese patent of 200410043694.3 discloses the preparation method of super hard water resistant sodium / potassium humate, but the disadvantage is that it is not suitable for the softening treatment of boiler water; Water treatment method, using a combination of chemical and physical treatment, the disadvantage is the need for additional investment in equipment

At present, there is no water softener for low-pressure boilers and heat exchange systems that has the functions of scale inhibition, scale removal and corrosion inhibition in China.