Abstract: A petrochemical company adopted organic Rankine cycle to recover low temperature waste heat from condensed water，steam and exhaust steam in the power generation process. The present situation and the process of power generation using every kind of low temperature waste heat in the company were described. The economic and environmental benefits of the power generation project were analyzed. The results indicated that the annual net income of power generation was 8.698 million Yuan; the annual average income of recycling soft water was 8.19 million Yuan, and the entire investment can be recovered in one year and a half. The annual energy saving reached about 169 354 GJ, the annual reduction amount of CO₂ was about 12.9 kt. The implementation of this power generation project is of great significance for improving the energy efficiency of the whole plant, creating energy-saving enterprise and promoting the company's energy saving and consumption reduction plan.

Key words: low temperature waste heat, organic Rankine cycle power generation, economic benefit, environmental benefit