الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 49 |  |  |
| | | from | 49 | | |
Abstract
”Product routing changes are required as changes in hydrogen recovery process occur to meet operational requirements. The product routing will be based on the PSA feed gas specification which H2S is 38 ppmv (max.) resulting in less than 135 ppmv in the PSA tail gas. In case of high CO2 concentration in outlet MDEA contactor, checked the quality of lean amine coming from lean amine unit and increase lean amine flow to both absorbers up to 120% of design capacity until achieved the normal CO2 value. If required change the source of lean amine (CO2 bearing amine). If it is still not reduced, then reduce the unit throughput (feed as flowrate to absorbers). When the quality of the feed gas to PSA is met as described above, the recovered hydrogen stream from the PSA unit will flow to the hydrogen compression first stage suction. The PSA tail gas stream is compressed, cooled and routed to the refinery fuel gas system via Tail Gas Compressor. During periods where H2S excursions exceed PSA unit limitations, a PSA unit bypass directs the amine absorber overhead to either the fuel gas system.”