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Electrolysis hydrogen generation technology is one of the feasible ways to alleviate the problem of wind electricity curtailment. One promising hydrogen value-added application is to blend hydrogen into the natural gas grid and sell it as the heat energy carrier. This paper aims to discuss the feasibility of a roadmap to urban energy internet with wind electricity-natural gas nexus. Firstly, a framework is raised to integrate wind electricity generation, electrolysis hydrogen generation, and hydrogen-natural gas blending systems. Secondly, a series of reasonable hydrogen supply profiles are provided based on annual electricity curtailment and realistic natural gas scheduling. Then, an energy optimisation model and a techno-economic model are applied to simulate the generation of electricity and hydrogen, as well as determine the most economical hydrogen supply scheme. Finally, a case study in the Beijing-Tianjin-Hebei region of China is taken to validate the benefits of the proposed roadmap. The preferred scheme is worked out with the net present value of 88.8 M$, including the economy configurations of the electricity-hydrogen hybrid generation system, as well as the hydrogen-natural gas blending plan. The results also indicate that annual electricity curtailment and annual carbon emission are decreased by 204 GWh (48.8%) and 40.2 kt (49.9%). • Raise a roadmap to urban energy internet with wind electricity-natural gas nexus. • Set a framework to integrate electrolysis hydrogen generation and blending systems. • Propose an overall optimisation model for economic and environmental analysis. • Hydrogen supply depends on wind electricity curtailment and natural gas scheduling. • The improved economic and environmental benefits in a real case are identified. [ABSTRACT FROM AUTHOR]

This article is devoted to discussing the feasibility and the optimal scheme to implement an electric-thermal carbon emissions neutral industrial park and perform a 3E analysis on various scenarios. A carbon emissions neutral framework of electric-thermal hydrogen-based containing MILP energy optimisation model is constructed. Photovoltaic power generation, electrolysis hydrogen production are considered in the model. There is an optimal scheme for realising carbon emissions neutrality in industrial parks, which will cost a relatively high price and the compromise scheme which can implement low carbon emissions is also worth studying. The results of the real-world case show that the present value of the cost of achieving carbon emissions neutrality is $ 8.61 billion (109). The scheme presents a compromise between environment and economy will cost $3.95 billion while bringing a 61 % reduction in emission compared with the baseline, which relies upon on-grid and natural gas. And the scheme is most affordable when hydrogen energy accounts for 95 %. Finally, in order to verify the generalisation of the roadmap, the analysis method has been applied to other industrial park cases of typical cities around the world, and the feasibility of achieving the carbon emissions near-neutral goal in these areas is evaluated. • A roadmap covered schemes of compromised low carbon and carbon emissions neutral was proposed. • A carbon emissions neutral framework of an electric-thermal hydrogen-based system is constructed. • An overall 3E analysis method coupled with an optimisation model is proposed. • Scheme to achieve carbon emissions neutral of an industrial park and various scenarios were studied. • Feasibility analysis of carbon emissions neutral cases along with typical cities worldwide. [ABSTRACT FROM AUTHOR]

Nowadays, environmental problems caused by petroleum industries need to be alleviated urgently for the transit to low-carbon oilfields. Carbon Capture & Storage-Enhanced Oil Recovery (CCS-EOR) is effective to increase oil production while reducing carbon emissions, but few studies evaluated the cyclic projects that connect capture and injection inside the oilfield. Aiming at Recycle-CCS-EOR (RCE) project, this study proposes a comprehensive technical-economic model to analysis the economic and environmental benefits, considering the uncertainties of geological conditions, prices, and CO 2 injection volume. Taking six blocks in real-world oilfields as the example, this model simulates four scenarios under different CO 2 acquisition methods and carbon taxes. The results show that the breakeven oil price of RCE is 29.4 $/barrel for carbon tax and 25.6 $/barrel for no tax. The recommendable CO 2 injection volume of RCE is higher than 33.5% HCPV for tax and 22.8% HCPV for no tax. Under the current range of CO 2 market price, RCE is more profitable when the capture investment is less than 80.9 M$ for carbon tax and 40.7 M$ for no tax. Compared with traditional EOR production, RCE project reduces carbon emissions by about 54.7%, indicating its technical feasibility, economic and environmental advantages in practical engineering. • Develop a Recycle–CCS–EOR model with economic and environmental advantages. • Show the applicability of the model through comparative analysis in four scenarios. • Identify the impact of critical parameters to the model's performance. • Evaluate the economic and environmental benefits of different blocks. [ABSTRACT FROM AUTHOR]