Senin, 31 Oktober 2011
Why Use Pyrolysis to MSW Treatment?
The main difference between the pyrolysis, gasification and incineration: the amount of oxygen that is supplied to thermal reactors. Pyrolysis has advantages in producing gas or oil products from waste that can be used as fuel for its process of pyrolysis.
Quantitatively differences between the pyrolysis, gasification and combustion: based on the needs of the air needed during the process, i.e. as follows
-If the amount of air: fuel (AFR, air-fuel ratio) = 0, then the process is called pyrolysis.
-If the AFR <1.5 then the process is called gasification.
-If the AFR> 1.5 then it is called the combustion process
Pyrolysis have a number of advantages are as follows:
-Lower temperature process (400-800 C) so the smaller the investment costs
-Flue-gas emissions below the required threshold.
-All the pyrolysis products have economic value.So that the sustainability of MSW processing is not only dependent on the tipping fee, but rather on the sale of the pyrolysis products.
-Pyrolysis can adjust to the type of feedstock such as pyrolysis of plastic will result in major product syn crude oil, pyrolysis of scrap tires will be produced also syn crude oil, carbon black and syn gas, and so other feedstock. The use according to type of feedstock will increase the economic value of the resulting product significantly. In process aspects this will be considered against the availability of feedstock and selling value of products produced.
Institute of Applied Energy (Tokyo) published in 2004 an analysis of stoker incinerator and pyrolysis plants operating under the same conditions. The analysis revealed that a conventional stoker grate incinerator with a steam turbine has no performance advantage over a pyrolysis plant at any scale.