The production of construction materials is very energy intensive and requires large quantities of fossil fuels.Asphalt is the major road paving material in Europe and is being produced primarily in stationary batch mixasphalt factories. The production process requiring the most energy is the heating and drying of aggregate,where natural gas, fuel oil or LPG is burned in a direct-fired rotary dryer. Replacing this energy source with amore sustainable one presents several technical and economic challenges, as high temperatures, short startuptimes and seasonal production variations are required. This paper analyses different pathways for the useof biomass feedstock as a primary process fuel. The analysed cases consider the gasification of straw andwood chips and the direct combustion of wood pellets. The additional use of syngas from the gasifier for theproduction of heat or combined heat and power is further evaluated during hours without asphalt production.The challenges of having varying seasonal production can be solved by this integration of the production unitto the utility system. The results show the economic and technical feasibility of using biomass for processheating in the asphalt factory. The dryer demand of 6.4 MW can be covered with a biomass input between 7.1and 8.6 MW. District heat can be produced at competitive prices below 40 € per MWh.
|Title of host publication||Chemical Engineering Transactions|
|Editors||Petar Sabev Varbanov, Peng-Yen Liew, Jun-Yow Yong, Jiří Jaromír Klemeš, Hon Loong Lam|
|Publication status||Published - 2016|
|Event||19th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2016) - Prague, Czech Republic|
Duration: 27 Aug 2016 → 31 Aug 2016
|Conference||19th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2016)|
|Period||27/08/2016 → 31/08/2016|