摘要 |
<p>The invention relates to a process and plant for producing sulphuric acid by catalytic oxidation of SO<sub>2</sub> to form SO<sub>3</sub> in a converter with at least one contact stage, the SO<sub>3</sub>-containing process gas, after it has passed through at least one contact stage, being withdrawn from the converter and fed to an apparatus for recovering heat, in which steam is generated from feedwater by means of the heat of the process gas, and the process gas then being fed to an absorber, in which the SO<sub>3</sub> is absorbed in sulphuric acid. To improve the utilization of heat during the production of sulphuric acid, the feedwater is fed to the heat recovery apparatus at a higher temperature than the process gas fed to the absorber.</p> |