| 摘要 |
<p>A process to provide a pressurized gas stream useful for removing nitrogen oxides from a combustion gas stream by hydrolyzing urea in aqueous solution in a closed reactor to evolve gaseous ammonia at a rate essentially balanced to the amount required from the combustion gas stream. The improvement resides in maintaining the pressure in the reactor within a pre-selected range when the demand for ammonia for external use suddenly drops by cooling the solution within the hydrolysis reactor by heat change either within or external to the reactor in response to rapid changes in demand for ammonia required to remove said nitrogen oxides.</p> |
