A method for quickly eliminating acid phosphate hidden in CDQ waste heat boiler

Abstract

The invention relates to a method for rapidly eliminating acid phosphate hide-out of a coke dry quenching waste heat boiler. The pH value of feed water of the boiler is controlled, after the acid phosphate hide-out phenomenon occurs, the pH value of the feed water is required to be controlled at an upper limit value 9.2; and an automatic secondary ammonia adding is increased for a complete condensation unit, when the pH value of the feed water is lower than 8.8, an ammonia adding pump is started to ensure that the pH value of the feed water is qualified; and if the pH value is lower continuously, guaranteed sodium hydroxide is added. The method disclosed by the invention has the advantages of eliminating the acid phosphate hide-out phenomenon, keeping the pH value of boiler water at 9.2-10.8, ensuring that the quality of steam water of the boiler is qualified, preventing scale formation of the boiler, ensuring long-term safe and stable operation of the boiler, preventing performing acid washing on the boiler in advance due to scale formation caused by the acid phosphate hide-out phenomenon during the operation of the coke dry quenching waste heat boiler and avoiding the occurrence of coke dry quenching pipe explosion phenomenon caused by scale formation.

Description

technical field [0001] The invention belongs to the technical field of boiler operation systems, and in particular relates to a method for quickly eliminating acid phosphate hidden in CDQ waste heat boilers. Background technique [0002] The load of the CDQ waste heat boiler is related to the production capacity of the coke oven. Due to the fluctuation of coke oven production, the load of the CDQ waste heat boiler is constantly changing during the production process, and the evaporation capacity fluctuates between 50t / h and 75t / h , Boiler load changes cause complex chemical changes in various ions in the furnace, which can easily cause acid phosphate hidden phenomena to occur, resulting in fluctuations in the pH value of CDQ boiler water between 6.0 and 8.0, and the furnace water is acidic, which can easily cause CDQ Acidic corrosion occurs in the coke waste heat boiler, which shortens the service life of the boiler. Contents of the invention [0003] In order to overcome...

AI Technical Summary

Problems solved by technology

[0002] The load of the CDQ waste heat boiler is related to the production capacity of the coke oven. Due to the fluctuation of coke oven production, the load of the CDQ waste heat boiler is constantly changing during the production process, and the evaporation capacity fluctuates between 50t / h and 75t / h , Boiler load changes cause complex chemical changes in various ions in the furnace, which can easily cause acid phosphate hidden phenomena to occur, resulting in fluctuations in the pH value of CDQ boiler water between 6.0 and 8.0, and the furnace water is acidic, which can easily cause CDQ Acidic corrosion occurs in the coke waste heat boiler, shortening the service life of the boiler