초록 ▼

A process for calcining a sulfate-containing denitrating catalyst to reduce the sulfate content therein is provided. A plurality of catalyst units are arranged on a reticulating belt in a calcining furnace. The reticulate belt is continuously moving within the furnace. Fresh hot air is passed throug

A process for calcining a sulfate-containing denitrating catalyst to reduce the sulfate content therein is provided. A plurality of catalyst units are arranged on a reticulating belt in a calcining furnace. The reticulate belt is continuously moving within the furnace. Fresh hot air is passed through the denitrating catalyst units in a first direction and then in a second direction. By controlling the rate of hot air flow, the content of sulfate group in the denitrating catalyst is reduced to about 4-7% by weight.

대표청구항 ▼

A process for calcining a sulfate containing denitrating catalyst used in exhaust gas denitration to uniformly reduce the sulfate content therein to a predetermined level, the process comprising the steps of: arranging a plurality of catalyst units on a reticulate belt in a calcining furnace, the ca

A process for calcining a sulfate containing denitrating catalyst used in exhaust gas denitration to uniformly reduce the sulfate content therein to a predetermined level, the process comprising the steps of: arranging a plurality of catalyst units on a reticulate belt in a calcining furnace, the catalyst units formed subsequent to mixing oxides of metals including Ti, W and/or Mo and V in sulfuric acid, wherein the resulting catalysts include sulfate in excess of 7% by weight; continuously moving the reticulate belt within the furnace; flowing fresh hot air at a temperature in the range of about 350°C. to 600°C. through the denitrating catalyst units in a first hot air direction at a rate of about 0.1 to 0.9 m/sec to separate the sulfate from the catalyst units, resulting in first sulfate-contaminated air; exhausting the first sulfate-contaminated air from the furnace; flowing fresh hot air through the denitrating catalyst units in a second direction directly opposite the first hot air direction to pass fresh hot air at a temperature in the range of about 350°C. to 600°C. through the catalyst units in a second direction at a rate of about 0.1 to 0.9 m/sec to separate sulfate from the catalyst units, resulting in second sulfate-contaminated air; exhausting the second sulfate-contaminated air from the furnace; and controlling the rate of hot air flow in the first and second directions so that the content of sulfate group is uniformly reduced to about 4 to 7 percent by weight of the catalyst.