Purge control for ammonia synthesis process

摘要

Control of the inerts concentration level in the synthesis loop of an ammonia synthesis process is accomplished by using process measurements to provide a continuous estimation of the inerts concentration level in the synthesis loop. This estimation is utilized to provide feed forward control of the purge rate. A chromatographic analyzer is utilized to measure the actual inerts concentration level in the synthesis loop. The actual measured inerts concentration level is utilized to correct the estimation of the inerts concentration level at the sample times of the chromatographic analyzer to provide feedback control of the purge rate.