A method for regenerating an NOx removal catalyst, the method being capable of readily restoring the catalytic activity of a deteriorated NOx removal catalyst; being performed by simple operations; and attaining high operational efficiency. The method for regenerating an NOx removal catalyst 14 empl
A method for regenerating an NOx removal catalyst, the method being capable of readily restoring the catalytic activity of a deteriorated NOx removal catalyst; being performed by simple operations; and attaining high operational efficiency. The method for regenerating an NOx removal catalyst 14 employed in a flue gas NOx removal apparatus includes immersing the NOx removal catalyst at ambient temperature in regeneration water 31 containing substantially no chlorine and no cleaning component; removing the catalyst from the regeneration water; and removing water from the catalyst.
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1. A method for regenerating an NOx removal catalyst employed in a flue gas NOx removal apparatus, characterized in that the method consists of (i) a first step of immersing the NOx removal catalyst in the form of a columnar honeycomb structure, wherein the NOx removal catalyst contains at least one
1. A method for regenerating an NOx removal catalyst employed in a flue gas NOx removal apparatus, characterized in that the method consists of (i) a first step of immersing the NOx removal catalyst in the form of a columnar honeycomb structure, wherein the NOx removal catalyst contains at least one of Ti, V, W and oxides thereof, which NOx removal catalyst having been used to remove NOx from flue gas, with bubbling from the NOx removal catalyst, from 1 to 30 minutes at a temperature of about 5° C. to about 40° C. in regeneration water consisting of pure water, such that none of the at least one of Ti, V, W and oxides thereof is eluted to the regeneration water, and wherein the first step does not include any other processes;(ii) a second step of removing the catalyst from the regeneration water, and removing water from the catalyst; and(iii) a third step of treating the regeneration water which has been employed in a regeneration step in a wastewater treatment facility without performing a treatment step on regenerating water to remove the at least one of Ti, V, W and oxides thereof; andwherein the regenerating water is reused. 2. A method for regenerating an NOx removal catalyst according to claim 1, wherein the NOx removal catalyst is immersed in regeneration water until bubbling stops and, subsequently, removed from the regeneration water. 3. A method for regenerating an NOx removal catalyst employed in a flue gas NOx removal apparatus, characterized in that the method consists of (i) a first step of immersing the NOx removal catalyst in the form of a columnar honeycomb structure, wherein the NOx removal catalyst contains at least one of Ti, V, W and oxides thereof, which NOx removal catalyst having been used to remove NOx from flue gas, with bubbling from the NOx removal catalyst, from 1 to 30 minutes at a temperature of about 5° C. to about 40° C. in regeneration water consisting of pure water, such that none of the at least one of Ti, V, W and oxides thereof is eluted to the regeneration water, and wherein the first step does not include any other processes;(ii) a second step for removing the catalyst from the regeneration water, washing the NOx removal catalyst removed from the regeneration water with water, and removing water from the catalyst; and(iii) a third step for treating the regeneration water which has been employed in a regeneration step in a wastewater treatment facility without performing a treatment step on the regenerating water to remove the at least one of Ti, V, W and oxides thereof; andwherein the regenerating water is reused. 4. A method for regenerating an NOx removal catalyst according to claim 3, wherein the NOx removal catalyst is immersed in regeneration water until bubbling stops and, subsequently, removed from the regeneration water. 5. A method for regenerating an NOx removal catalyst according to claim 1, wherein the regeneration water which has been used in the regeneration step is treated in the treatment step after it is repeatedly used, without undergoing any treatment, a plurality of times in a regeneration step for regenerating another NOx removal catalyst. 6. A method for regenerating an NOx removal catalyst according to claim 2, wherein the regeneration water which has been used in the regeneration step is treated in the treatment step after it is repeatedly used, without undergoing any treatment, a plurality of times in a regeneration step for regenerating another NOx removal catalyst. 7. A method for regenerating an NOx removal catalyst according to claim 3, wherein the regeneration water which has been used in the regeneration step is treated in the treatment step after it is repeatedly used, without undergoing any treatment, a plurality of times in a regeneration step for regenerating another NOx removal catalyst. 8. A method for regenerating an NOx removal catalyst according to claim 4, wherein the regeneration water which has been used in the regeneration step is treated in the treatment step after it is repeatedly used, without undergoing any treatment, a plurality of times in a regeneration step for regenerating another NOx removal catalyst. 9. A method for regenerating an NOx removal catalyst employed in a flue gas NOx removal apparatus, characterized in that the method consists of (i) a first step of immersing the NOx removal catalyst in the form of a columnar honeycomb structure, wherein the NOx removal catalyst contains at least one of Ti, V, W and oxides thereof, which NOx removal catalyst having been used to remove NOx from flue gas and containing heavy metal, with bubbling from the NOx removal catalyst, from 1 to 30 minutes at a temperature of about 5° C. to about 40° C. in regeneration water consisting of pure water, such that none of the at least one of Ti, V, W, and oxides thereof is eluted to the regeneration water, and wherein the first step does not include any other processes;(ii) a second step of removing the catalyst from the regeneration water, and removing water from the catalyst;(iii) a third step of treating the regeneration water which has been employed in a regeneration step in a wastewater treatment facility without performing a treatment step on regenerating water to remove the at least one of Ti, V, W and oxides thereof; and(iv) a fourth step of installing the NOx removal catalyst having been regenerated in the flue gas NOx removal apparatus without drying the catalyst before installation; andwherein the regenerating water is reused. 10. A method for regenerating an NOx removal catalyst employed in a flue gas NOx removal apparatus, characterized in that the method consists of (i) a first step of immersing the NOx removal catalyst in the form of a columnar honeycomb structure, wherein the NOx removal catalyst contains at least one of Ti, V, W and oxides thereof, which NOx removal catalyst having been used to remove NOx from flue gas and containing heavy metal, with bubbling from the NOx removal catalyst, from 1 to 30 minutes at a temperature of about 5° C. to about 40° C. in regeneration water consisting of pure water, such that none of at least one of Ti, V, W and oxides thereof is eluted to the regeneration water;(ii) a second step of removing the catalyst from the regeneration water, and removing water from the catalyst;(iii) a third step of treating the regeneration water which has been employed in a regeneration step in a wastewater treatment facility without performing a treatment step on regenerating water to remove the at least one of Ti, V, W, and oxides thereof; and(iv) a fourth step of installing the NOx removal catalyst having been regenerated in the flue gas NOx removal apparatus after catalytic performance of the regenerated NOx removal catalyst is assessed; andwherein the regenerating water is reused. 11. A method for regenerating an NOx removal catalyst employed in a flue gas NOx removal apparatus, characterized in that the method consists of (i) a first step of immersing the NOx removal catalyst in the form of a columnar honeycomb structure, wherein the NOx removal catalyst contains at least one of Ti, V, W and oxides thereof, which NOx removal catalyst having been used to remove NOx from flue gas and containing heavy metal, with bubbling from the NOx removal catalyst, from 1 to 30 minutes at a temperature of about 5° C. to about 40° C. in regeneration water consisting of pure water, such that none of the at least one of Ti, V, W and oxides thereof is eluted to the regeneration water;(ii) a second step of removing the catalyst from the regeneration water, and removing water from the catalyst;(iii) a third step of treating the regeneration water which has been employed in a regeneration step in a wastewater treatment facility without performing a treatment step on regenerating water to remove the at least one of Ti, V, W and oxides thereof; wherein the method further consists of installing the NOx removal catalyst having been regenerated in the flue gas NOx removal apparatus without drying the catalyst before installation; and(iv) a fourth step of installing the NOx removal catalyst having been regenerated in the flue gas NOx removal apparatus after catalytic performance of the regenerated NOx removal catalyst is assessed; andwherein the regenerating water is reused. 12. A method for regenerating an NOx removal catalyst employed in a flue gas NOx removal apparatus, characterized in that the method consists of (i) a first step of immersing the NOx removal catalyst in the form of a columnar honeycomb structure, wherein the NOx removal catalyst contains at least one of Ti, V, W and oxides thereof, which NOx removal catalyst having been used to remove NOx from flue gas and containing heavy metal, with bubbling from the NOx removal catalyst, from 1 to 30 minutes at a temperature of about 5° C. to about 40° C. in regeneration water consisting of pure water, such that none of the at least one of Ti, V, W and oxides thereof is eluted to the regeneration water, and wherein the first step does not include any other processes;(ii) a second step of removing the catalyst from the regeneration water, and removing water from the catalyst;(iii) a third step of treating the regeneration water which has been employed in a regeneration step in a wastewater treatment facility without performing a treatment step on regenerating water to remove the at least one of Ti, V, W and oxides thereof; and(iv) a fourth step of installing the regenerated NOx removal catalyst in the flue gas NOx removal apparatus such that the catalyst is inverted with respect to an original position of the catalyst before regeneration; andwherein the regenerating water is reused. 13. A method for regenerating an NOx removal catalyst according to claim 9, wherein the regenerated NOx removal catalyst is installed in the flue gas NOx removal apparatus such that the catalyst is inverted with respect to an original position of the catalyst before regeneration. 14. A method for regenerating an NOx removal catalyst according to claim 10, wherein the regenerated NOx removal catalyst is installed in the flue gas NOx removal apparatus such that the catalyst is inverted with respect to an original position of the catalyst before regeneration. 15. A method for regenerating an NOx removal catalyst according to claim 11, wherein the regenerated NOx removal catalyst is installed in the flue gas NOx removal apparatus such that the catalyst is inverted with respect to an original position of the catalyst before regeneration.
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