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Hybrid steam supply system for saving fuel gas and reducing carbon footprint of the oil & gas industry


ADNOC Gas Processing has more than 5,000 TPH steam generation capacity which is equivalent to 3.84 GW thermal Previous HitenergyNext Hit load. Steam is primarily generated by firing fuel gas. Significant portion of this demand can be alternatively supplied by Previous HitSolarNext Hit CSP. Aforementioned magnitude of total steam demand as well as few individual users with 80 to 100 MWth demand indicates application of utility scale Previous HitSolarNext Hit CSP. As of now, utility scale use of Previous HitSolarNext Hit CSP is mainly for power generation only with just few examples of steam generation for EOR. Continuous downward trend of Levelized Cost of Electricity (LCOE) for Previous HitSolarNext Hit CSP has been observed in last few years. In Year 2017, Dubai Electricity and Water Authority (DEWA) awarded the contract to build the 700 megawatt (MW) fourth phase of the Mohammed bin Rashid Al Maktoum Previous HitSolarNext Hit Park at LCOE bid of USD 7.3 cents per kilowatt-hour. Significant reduction in CAPEX and accordingly decrease of LCOE to around USD 5.0 cents per kWh is envisaged by eliminating power block and directly utilizing the steam for process heating in industrial applications.

This paper reviews technical viability of hybrid system to supply steam for process heating in the Oil & Gas Industry. Proposed hybrid system is to integrate Previous HitSolarNext Hit CSP based steam generation with the existing auxiliary boilers based steam generation by fuel gas. Paper addresses adequacy of available Direct Normal Irradiance for Previous HitSolarNext Hit CSP plants with special emphasis on the Middle East region. Paper discusses temperature profiles of end-use applications (like gas sweetening and dehydration etc.) in conjunction with the existing steam system network operating conditions. It also describes supply temperatures of parabolic trough and Previous HitsolarNext Hit tower CSP technologies along with operating temperature ranges of Heat Transfer Fluids (HTFs) encompassing organic & mineral oils and molten salts. Review of tie-ins for steam supply from Previous HitSolarNext Hit CSP to existing network and return of condensate from existing network to Previous HitSolarNext Hit CSP has also been presented. Instrumentation & Control philosophy for the proposed hybrid process has also been discussed with focus to minimize additional instrumentation. Paper also examines repercussions of existing auxiliary boilers sustained low load operation due to supply of steam from Previous HitSolarNext Hit CSP.

Cost analysis of the proposed hybrid steam supply system has also been presented. It addresses expected LCOE of steam generation from Previous HitSolarTop CSP and its feasibility as an alternative to fuel gas based steam generation from existing boilers. Overall impact in terms of reduction in carbon footprint has also been discussed.