Boiler chemical cleaning method

The described method addresses the issue of chemical solution ingress into boiler ceiling walls by using a sealing water sealing and controlled flow system, ensuring effective cleaning without ceiling wall damage.

JP2026100171APending Publication Date: 2026-06-19MITSUBISHI HEAVY IND LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
MITSUBISHI HEAVY IND LTD
Filing Date
2024-12-09
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

The increased foaming and permeability of chemical cleaning solutions in boilers lead to the risk of chemical cleaning solution vapors or droplets mixing with sealing water in the ceiling wall, causing scale lifting and overheating damage during normal operation.

Method used

A method involving a sealing water sealing step to fill the ceiling wall and connecting pipes with sealing water up to a specific height, followed by a cleaning solution injection step into the steam separator, with controlled sealing water flow and neutralization to prevent chemical solution ingress into the ceiling wall.

Benefits of technology

This method effectively protects the ceiling wall from chemical cleaning solutions, preventing scale lifting and overheating, while ensuring reliable cleaning of the boiler components.

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Abstract

This invention provides a boiler chemical cleaning method that allows for more reliable protection of the ceiling and walls as non-cleaning areas while performing the cleaning. [Solution] The boiler chemical cleaning method includes a steam separator, a ceiling wall, and a superheater, which are arranged in order from the upstream side in the direction of steam flow generated by heating the boiler feedwater. The boiler further includes a first connecting pipe that connects the steam separator to the inlet side header of the ceiling wall, and the first connecting pipe has a rising section that rises upward from the inlet side header and an outlet formed in the middle of the rising section. The boiler chemical cleaning method includes a seal water sealing step of supplying seal water from the ceiling wall or the downstream side of the ceiling wall so that the seal water fills up to the height level of the outlet in the rising section, and a cleaning liquid injection step of injecting a chemical cleaning liquid into the steam separator after the seal water sealing step.
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