METHOD OF REMOVING RESIDUE OF FILTER FOR EMISSION CONTROL SYSTEM AND CLEANING SOLUTION FOR RESIDUE OF FILTER FOR EMISSION CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To obtain a method of cleaning a combustion residue which enables use of a filter for an emission control system under the condition of a small increase in pressure loss for a long period, by effectively removing the combustion residue attached to the filter which is formed on the filter for the emission control system at the time of regenerated combustion or the like, and is insoluble or excessively insoluble in water which cannot be removed even by high-pressure cleaning using water and cleaning solution therefor.;SOLUTION: The filter is cleaned with the cleaning solution containing a substance which reacts to at least one part of the combustion residue attached to the filter by regenerated combustion and is insoluble or excessively insoluble in water, and which converts the part into a water-soluble substance. The cleaning solution preferably contains a substance which forms a complex with a metal element contained in the combustion residue, or which has a higher production constant against the metal element contained in the combustion residue than a non-metal element and its compound contained in the combustion residue.;COPYRIGHT: (C)2004,JPO&NCIPI