GEA supplies compressor packages for refinery application in Azerbaijan

Tail gas treatment

The purpose of these tail gas compression units is to receive the tail gas – a gas mixture composition with up to ~70% hydrogen – from the PSA System and keep stable pressure at the PSA discharge. Received gas is compressed up to 6,7 bar(g) and then cooled down to 40°C in the after cooler before it is returned to the customer’s system.
These units are based on an oil-flooded screw compressor and the oil is separated from the tail gas into two oil separators (main and final) in order to deliver the gas with less than 1 ppm of oil content.
As an oil-flooded screw compressor, the oil circuit is provided for lubricating the internal part of the screw compressor. The oil circuit comprises two oil pumps (one in standby), a pressure control valve to keep the oil pressure constant and an electro-pneumatic three-way control valve to maintain the oil flow to the compressor at a fixed temperature. The oil circuit also comprises two oil coolers (one in standby) with a common inlet and outlet line for the cooling water system. The discharged oil at high temperature, recovered in the oil separator, is cooled down by using cooling water as a medium.
All vessels and all heat exchangers are designed and manufactured according to ASME (American Society of Mechanical Engineers) and TEMA R (Tubular Exchanger Manufacturers Association). GEA also provided the personnel protection with rock wool and aluminum and winterization of the entire oil circuit.