The Organic Rankine Cycle option
Steam turbine technology has been favoured over Organic Rankine Cycle (ORC) modules technlology for waste heat recovery (WHR) at cement plants. However, improvements in cement production offer scope for the increased uptake of WHR through the ORC process.
In terms of heat generated in industrial processes, approximately 50 per cent of the fuel used to produce power in conventional plants and 60 per cent of the energy used in industrial processes is wasted, according to the International Energy Agency (IEA).
Typically, a cement process absorbs around 53 per cent of the energy produced. Out of the 47 per cent of wasted heat, some 34 per cent could be recovered to generate up to 30 per cent of the plant’s electrical needs. Although waste heat recovery (WHR) is a proven technology, until now it has not been widely implemented except in China. According to the International Finance Corporation (IFC), around 850 WHR installations exist worldwide (mainly in China), with 739 mainly using steam turbine technology.
For the cement industry, WHR is an important tool as it can reduce operating costs and increase EBITDA by 10-15 per cent. Electrical power expenses usually account for around 25 per cent of total
operating costs. WHR advantages include:
•reducing energy costs of a plant
•reducing reliance on grid power
•mitigating the impact of future (…)
Read the Article (Her)
International Cement Review (May 2017)