Enhancing Energy Efficiency in Refining and Petrochemical Processes: A Review of Current Industry Strategies, Initiatives and Case Studies

Industrial energy demand continues to rise, as various nations across the globe drive their economic growth and development through industrialization. Nigeria's refining and petrochemical industry is not left out by coming on stream of two state-owned refineries following the kick-start of a privately owned 650,000 bbl/d crude oil refining capacity plant coming on stream. Refining and petrochemical plants are significant energy consumers. For instance, studies indicate refineries lose 60-70% of their energy as waste heat. This waste heat, often exceeding 300°C (572 °F), presents an opportunity for improved efficiency and reduced environmental impact. Hence, this explorative research is focused on reviewing existing technologies, literature, and case studies globally and developing adaptable initiatives and strategies that suit the rapidly growing and emerging Nigerian midstream oil and gas sector. From the extensive literature, best practices, and case studies reviewed, it was noted that the most efficient means of increasing the efficiency of the refinery and distribution process is to hybridize the refinery's energy utilization and conversion based on the most available, affordable, and efficient energy sources available locally in Nigeria. An integrated application of a relatively stable electric supply and renewable energy sources such as solar panels, geothermal energy, and wind energy can be harnessed along the coastlines where most of these refineries are domiciled. Finally, this article explores potential methods for capturing waste heat in refineries, focusing on its conversion into usable energy. It was discovered that by implementing waste heat recovery systems, local refineries operating in Nigeria can achieve energy savings of 10-30%, lowering the relatively high operational costs and reliance on non-renewable sources such as fossil fuels in powering and driving production in refining and petrochemical plants. In addition, it was concluded that waste heat recovery could significantly reduce greenhouse gas emissions, with estimates suggesting a potential decrease of up to 20% in CO2 emissions. This article proposes that waste heat recovery represents a crucial strategy and a strong energy utilization optimization point for a sustainable refining future for Nigeria's emerging refining and petrochemical market, bringing about economic and environmental benefits.