Scale and corrosion inhibiting method for industrial boiler

Abstract

The scale and corrosion inhibiting method for industrial boiler includes preparing stable sodium sulfite with sodium sulfite and isoascorbic acid, adding polyepoxy succinic acid into the boiler system, adding stable sodium sulfite and maintaining the amount inside the boiler system in 2-10 mg/L to make these two kinds of green scale inhibitor and deoxidant take synergistic effect, so as to provide environment friendly, high efficiency scale and corrosion inhibiting method for industrial boiler.

Description

technical field [0001] The invention relates to an anti-corrosion and scale-inhibiting method for industrial boilers, in particular to an anti-corrosion and scale-inhibiting method using an anti-scale and oxygen scavenger. Background technique [0002] For low-pressure boilers, the commonly used antiscaling methods are softening-scaling agent method and antiscaling agent method, and the commonly used anti-corrosion methods are deaerator-oxidizing agent method and oxygen scavenging method. The scale inhibitors currently used mainly include phosphate, polyphosphate, organic polyphosphonic acid, polyacrylic acid, styrene sulfonic acid and maleic acid copolymer, etc. These scale inhibitors have good scale inhibition effect, but Can cause environmental problems, so its discharge has been restricted. The more important oxygen scavengers include sulfite, hydrazine, diethylhydroxylamine, carbohydrazide, hydroquinone, aminoguanidine, methyl ethyl ketone oxime, etc. Among them, sulfi...

AI Technical Summary

Problems solved by technology

U.S. Patent US 5,866,011 (1999, February, 2) provides a method of antiscaling by using PESA to prevent scaling of salt concentration and evaporation systems. In the above patents, PESA works at normal pressure, low temperature, low alkalinity, low Under the condition of pH value and water quality with sufficient oxygen supply, while the boiler system is under the condition of high pressure, high temperature, high alkalinity, high pH value and anoxic or anaerobic water quality conditions, general polymers will fail under these conditions, such as PESA Whether green polymers can effectively prevent fouling of boiler heat transfer surfaces under these conditions, and whether there is a synergistic effect between it and oxygen scavengers, has not been reported in the literature so far

Therefore, there is currently no environmentally friendly anti-corrosion and anti-scaling method suitable for the combination of green anti-scaling and preservatives for boiler systems.