Secondary Heat Use for Chlorine Dioxide (ClO2) Pre-heatingCosts & Benefits
|Parent Process: Bleaching|
|Energy Savings Potential||
In one study, for a mill producing 1 000 ADT of bleached pulp, where Kappa value to bleaching is 30, where a ClO2 concentration of 9.5 g/l is used, and where ClO2 is heated from 2.8 to 43.3 C, 0.59 GJ/ADT of energy savings were estimated by using secondary heat in preheating (NCASI, 2001. p. 77).
|CO2 Emission Reduction Potential||
For the same mill studied a net CO2 reduction of 12 625 t-CO2/year has been estimated.
For the plant corresponding to 0.59 GJ/ADT saving, annual cost savings of $430 900 (2001 dollars) were estimated. Capital costs are largely due to the cost of heat exchanger and piping (NCASI, 2001. p.77).
For another plant, savings in fuel, electricity, and steam were estimated at $61,000, while capital costs were estimated at $124,000 (2003 dollars) ((Kramer et al., 2009. p.93).
Secondary Heat Use for Chlorine Dioxide (ClO2) Pre-heatingSchematic
Secondary Heat Use for Chlorine Dioxide (ClO2) Pre-heating Publications
This Energy Guide discusses energy efficiency practices and energy-efficient technologies that can be implemented at the component, process, facility, and organizational levels.
Technologies For Reducing Carbon Dioxide Emissions: A Resource Manual For Pulp, Paper, And Wood Products Manufacturers
This report from National Council For Air And Stream Improvement in the US provides descriptions of technologies for CO2 reduction in pulp and paper mills, and offers calculations on cost and CO2 savings.