Loading patent…
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsHitoshi Nakamura, Norihisa Kobayashi, Kozo Iida, Osamu Naito, Yoshiaki Obayashi
Estimating the term…
A method for economically modifying a gas turbine single plant into a combined cycle plant, a method for re-using a used high temperature denitration catalyst of the gas turbine single plant as an intermediate temperature denitration catalyst of other modified, existing or new plants and a re-produced catalyst are provided. The high temperature denitration catalyst of the gas turbine single plant contains TiO2, at least one of WO3 and MoO3 and V2O5 of 0.5 wt % or less, preferably 0.2 wt % or less or none of V2O5 and is optimized to be used in the temperature range up to maximum 450 to 600° C. The used high temperature denitration catalyst is immersed into V-containing water solution and dried and/or burned. An intermediate temperature denitration catalyst is re-produced containing V2O5 component of 0.5 wt % or more, preferably 1.0 wt % or more, and being optimized to be used in the temperature range of 250 to 450° C. This intermediate temperature denitration catalyst is re-used in the combined cycle plant after modified or other plants.
A method for modifying a gas turbine single plant into a combined cycle plant, comprising the steps of re-producing a used high temperature denitration catalyst of said gas turbine single plant into an intermediate temperature denitration catalyst and re-using said intermediate temperature denitration catalyst so re-produced as a denitration catalyst of said combined cycle plant after modified.
A method for re-using a used high temperature denitration catalyst, comprising the steps of re-producing said used high temperature denitration catalyst of a gas turbine single plant into an intermediate temperature denitration catalyst and re-using said intermediate temperature denitration catalyst so re-produced as an intermediate temperature denitration catalyst of other modified, existing or new plants.
A re-produced catalyst, being re-produced into an intermediate temperature denitration catalyst by including V2O5 component of 0.5 wt % or more, preferably 1.0 wt % or more, in a used high temperature denitration catalyst that contains TiO2 as a main component and at least one of WO3 and MoO3 and further includes V2O5 of 0.5 wt % or less, preferably 0.2 wt % or less, or none of V2O5.
Dependencies are inferred from the claim text.