HOW DID DEVIL CREEK INCREASE GAS PRODUCTION AND GO GREENER?
Quadrant Energy runs the Devil Creek Gas Plant as one of three natural gas processing hubs which supplies gas to the domestic gas market in Western Australia. Located near Karratha and with a capacity of 220Tj/d, it provides a reliable and independent supply of gas for Western Australia and has become a key supplier for many households.
For safety reasons, Quadrant’s gas plant processing system relies on all its pipelines being purged of air before the introduction of any natural gas into its plant. Previously it had been relying on methane gas to do the purging with its associated non-green venting emissions. However, driven by the desire to reduce environmental emissions as well as achieve an increase in the quantity of marketable gas produced per annum, the significant investment in the plant has exceeded the objective of replacing the methane used in its purging process with nitrogen.
In order to achieve a constant and reliable supply of nitrogen for pipe purging, flare control, compressor operations and black start operations, Quadrant turned to Oxair to supply two containerised nitrogen systems installed onsite – with spectacular results. Not only did the nitrogen generators help to create reduced vented emissions of 3.5 MtCO2-e per annum but an additional estimated 60TJ per annum of gas is now available to sell to the market – bringing added economic benefits to Quadrant.
One of the main reasons that Oxair’s systems were chosen was that its technology, using Air Products’ membranes for this particular application, is extremely reliable and stable. It also allows the end user to run the unit 24/7 with minimal interaction with the plant.
The units were built around Quadrant’s stringent specifications and then successfully integrated into their Distributed Control System (DCS). The two packages contained both the primary feed air and filtration as well as a nitrogen membrane system used to generate the controlled purity and flow of nitrogen required. The continuous rate of supply achieved during normal operations is now around 160 Sm3/hr.
In addition to the environmental benefits of onsite nitrogen generation, there are additional safety advantages of not having to transport nitrogen to site on demand. Previously, when nitrogen was needed there was a requirement to deliver it to site in quads at high pressure (250barg). Accessing this pressurised inventory posed safety risks to employees; mainly due to the use of temporary hoses, manual handling and bespoke pressure relief which was required. Having nitrogen generated at the plant itself has effectively eliminated all the risks previously incurred when moving nitrogen around.
Quadrant’s lead facilities engineer, Neil Halpin, commented: “We were delighted to find a local company that offered competitive pricing and were able to provide total technical compliance with QE specification and design criteria. Thanks to this project we have made financial gains with gas savings and have been able to offset our carbon footprint. Flare is now run exclusively with nitrogen as the purge gas. Working with Oxair was made easy for us by their good technical knowledge and ongoing support during performance testing of the packages. Quadrant view this project as a real positive for the organisation.”
Devil Creek commenced operations in December 2011, and today provides a reliable and independent supply of gas for Western Australia. In 2016, Quadrant Energy accounted for 22.3 percent of domestic gas production in Western Australia (84.8 petajoules), making it the state’s largest single domestic gas supplier.
Since engaging in its onsite nitrogen generation project with Oxair, Quadrant Energy has reported a $342 million net profit in 2017, up from $86 million the year before - putting the company in a strong position to capitalise on several growth opportunities. In addition, it can reassure the population of Western Australia that they will be able to relax comfortably in their homes knowing they will be supplied with reliable, safe and greener energy for many years to come.
Western Australia-based Oxair Gas Systems Pty Ltd is a leading manufacturer of gas process systems, for shipboard and land-based, use. Oxair specialises in the supply of on-site gas generation equipment to the Australian and international markets.
It designs and manufactures packaged oxygen Pressure Swing Adsorption (PSA) tonnage plants, nitrogen membrane and PSA systems as well as dryer and filtration packages.
The company also produces pressure vessels and skid fabrication and process piping. Oxair’s designs are focused on customer requirements of reliability, ease of maintenance, safety and plant self-protection.
Oxair Gas Systems Pty Ltd
32 Prosperity Avenue,
Western Australia 6065
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