Method and treatment system for reducing silicon content in industrial water

Abstract

The invention belongs to the technical field of industrial water treatment and relates to a method and treatment system for reducing the silicon content in industrial water. The method for reducing the silicon content in industrial water utilizes compounding and adding of several agents for treatment and comprises adding a silicon removing agent into raw water to be treated, carrying out uniform mixing, adding a flocculant A into the mixture, carrying out uniform mixing, optionally adding a flocculant B into the mixture, and carrying out precipitation and filtration to reduce the silicon content of the water. The silicon removing agent comprises an alkali metal compound and / or an alkaline earth metal compound. The flocculant A includes an inorganic high-molecular flocculant. The flocculantB includes an organic polymer flocculant. The method and system can effectively reduce the silicon content in the raw water and effectively relieve the silicon removal load in the primary desalination water station system. The method has simple processes, is easy to operate and has good treatment effects.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment, and in particular relates to a method and a treatment system for reducing silicon content in industrial water. Background technique [0002] Silicon compounds in industrial water will cause different degrees of harm to the production process. The water standard for industrial boilers has strict restrictions on the content of silicon. Most of the silicon in the water must be removed before entering the boiler. Silica scale is dense and hard, which is difficult to clean by ordinary methods, which seriously affects the heat transfer efficiency and safe operation of the equipment, and easily brings hidden dangers to production safety. In thermal power plants, silicic acid in water is a harmful substance. It will not only form scale on the furnace tubes with high heat load, but also cause salt accumulation on the turbine blades, resulting in failure of boilers and turbines. Foulin...

AI Technical Summary

Problems solved by technology

The water standard for industrial boilers has strict restrictions on the content of silicon. Most of the silicon in the water must be removed before entering the boiler. Silica scale is dense and hard, which is difficult to clean with ordinary methods, which seriously affects the heat transfer efficiency and safe operation of the equipment, and is likely to bring hidden dangers to production safety

In thermal power plants, silicic acid in water is a harmful substance, which will not only form scale on the furnace tube with high heat load, but also cause salt accumulation on the turbine blades, resulting in failure of boilers and turbines

Fouling can reduce power output by 10% to 20%, and thermal efficiency by 10%

Although the amount of silicate scale is small, it is very harmful, especially it can interact with other ions, which not only increases the amount of scale formation, but also increases the hardness of scale, which brings huge hidden dangers to industrial boilers

[0003] The traditional silicon removal method commonly used in boiler feed water is to use solid magnesium salt and resin method to remove silicon technology. The main problems of the above method are: complex process, small processing capacity, large amount of waste residue, low efficiency, unstable effect, etc., and The resin method also requires complex equipment and processes such as water quality modification and decarbonization, which seriously pollutes the environment and requires high operating costs.

In addition, when the silicon content in the water source is high, the existing silicon removal methods have limited processing capacity, which brings great difficulties to the subsequent treatment of the desalinated water system and increases the silicon removal load of the first-level desalinated water station. The quality of desalinated water cannot fully meet the production requirements, especially the SiO in the effluent of primary desalinated water 3 2－ The concentration cannot reach the standard

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