Off-gas from the metal industry is a significant surplus heat source that is often not utilized due to lack of internal and external heat demands. Power production from the surplus heat in the off-gas could be a promising option for utilization. This work considers an off-gas at 150 °C from a metall...

The expander is one of the key components of an ORC as the cycle efficiency strongly depends on the expander efficiency. This paper presents a method for design optimization of a radial inflow turbine (RIT) using a mean-line model. The novelty of this work lies in the equation-based formulation of t...

Surplus heat recovery and electricity generation from furnace off-gas has been implemented at several silicon and ferro-alloy plants in Norway. There is likely significant potential for improvement of both technology elements, system concept, and operation methodology. The main reported issues in cu...

This study applies three methods for design of Rankine cycles utilizing waste heat in the oil and gas industry. The methods differ in the level of detail of heat exchanger model applied and in the flexibility with respect to heat exchanger design. All the methods involve formulating a constrained op...

The thermal exergy contained in the liquid metal in ferroalloy production makes it an interesting source for energy recovery. The heat released during casting is rarely utilized today. This work investigates the feasibility of continuous power production from batch wise ferroalloy casting using an e...

Heat recovery heat exchangers for heat-to-power conversion from metallurgical off-gas should have a compact design that reduces component cost and footprint. The goal of our study is to investigate and identify key heat exchanger design parameters for minimizing the surface area of heat recovery hea...

Applying Rankine cycles to smelter off-gas could increase the required off-gas fan power in an order of magnitude equivalent to the power production. Predicting the fan power is not straightforward since it is affected in two contradictory ways: 1) the heat recovery heat exchanger creates additional...