GEA Refrigeration Technologies (GEA) will supply GEA model XH compression packages for a tail gas application at a refinery in Azerbaijan. The screw compressor systems are designed for a modernization program at the Heydar Aliyev Oil Refinery (HAOR) in Baku.
GEA’s tail gas packages were selected for the project by Honeywell UOP as part of its Pressure Swing Adsorption (PSA) technology to supply hydrogen for the modernization of the plant. Pure hydrogen is used to decontaminate oil and facilitate catalytic processes that produce clean-burning fuels, including those that meet Euro V standards for vehicle emissions.
The modernization enables the refinery to process 7.5 million metric tons per year of crude oil blended from local sources. Hydrogen is key in the refining process, being produced as a byproduct of refining and intentionally from a steam methane reformer. Honeywell UOP’s PSA technology purifies this hydrogen so it essentially can be recycled into the refinery to remove impurities and to perform catalytic processes that transform crude oil into clean fuels and other products.
The purpose of the 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.
- Compressor: GEA oil-flooded, single-stage screw
- Model: GEA XHA-XH36A-28
- Capacity: 11427.0 Sm3/h
- Gas Handled: Tail gas
- Suction Pressure: 0.31 bar(g)
- Discharge Pressure: 6.7 bar(g)
- EM installed: 1.370 kW