A method for preventing low temperature corrosion of yellow phosphorus tail gas boiler

By spraying alkaline powder material into the low-temperature section of the tail flue of the yellow phosphorus exhaust boiler and covering the outer wall of the heat exchange tube, combined with the use of surfacing Alloy625 nickel-based alloy or silicon carbide, the corrosion problem of boiler accessories caused by impurities in the yellow phosphorus exhaust gas is solved, and the effect of extending service life and reducing operating costs is achieved.

CN119755610APending Publication Date: 2025-04-04WENGAN LONGMA PHOSPHORUS IND CO LTD
0 Cites 0 Cited by

Patent Information

Application Number
CN202510094827.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-21
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

Impurities in the yellow phosphorus exhaust gas condense in the low-temperature section of the flue at the tail of the boiler, forming acidic substances, resulting in corrosion of boiler accessories, especially economizers and air preloaders, reducing service life and increasing operating safety risks.

Method used

A powder silo is added to the low-temperature section of the flue at the tail of the boiler, and alkaline powder material is sprayed through the pneumatic conveying system, covering the outer wall of the heat exchange tube and in contact with the flue gas, absorbing acidic substances and moisture in the flue gas and preventing corrosion. At the same time, the outer wall of the heat exchange tube is fully covered with surfacing Alloy625 nickel-based alloy or silicon carbide to enhance corrosion resistance.

Benefits of technology

It effectively prevents corrosion and perforation of economizers and air preloaders in the low-temperature section of the boiler tail flue, extends service life, and reduces the operating cost of the yellow phosphorus exhaust purification system.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The present invention provides a method for preventing low-temperature corrosion of a yellow phosphorus tail gas boiler. First, by fully covering the outer wall of the economizer and air preheater heat exchange tubes in the low-temperature section of the boiler tail flue with Alloy625 nickel-based alloy or silicon carbide, corrosion and perforation of the low-temperature section economizer and air preheater heat exchange tubes are prevented; second, by spraying alkaline powder materials into the low-temperature section of the boiler tail flue, the alkaline powder materials cover the outer wall of the heat exchange tube, directly contact with the flue gas, absorb acidic substances and moisture in the flue gas, and avoid corrosion of the heat exchange tube. By setting a soot blowing system and regularly blowing and cleaning the tail flue, the tail flue can be prevented from being blocked. After the implementation of the present invention, the yellow phosphorus tail gas desulfurization device can be stopped, the boiler has lower requirements for the quality of the yellow phosphorus tail gas, and the operating cost of the yellow phosphorus tail gas purification system can be greatly reduced.
Need to check novelty before this filing date? Find Prior Art