Pyrolysis is an endothermic process that induces the thermal decomposition of feed materials without the addition of any reactive gases, such as air or oxygen. The thermal efficiency of this process is approximately 70%, and can increase to 90% with the use of pyrolysis products as fuel . The use of tyre chips instead of whole tyres may a lso increase the efficiency of the process by 20 -30% . The thermal energy used to drive the pyrolysis reaction is applied indirectly by thermal conduction through the walls of the containment reactor. Pyrolysis generally occ urs at temperatures between 4 00 and 800°C .
As the temperature changes, the product distribution (or the phase of the product s) are also altered. Lower pyrolysis temperatures usually produce more liquid products whi le higher temperatures f avour the production of gases. The speed of the process and rate of heat transfer also influences the product distribution. Slow pyrolysis (carbonization) can be used to maximize the yield of solid char. This process requires a slow pyrolytic decomposition at low temperatures. Rapid quenching is often used to maximize the production of liquid products, by condensing the gaseous molecules into liquid. In some pyrolysis processes, a product up to 80% liquid by weight can be produced . Hydrogen or steam can also be used in the pyrolysis process to change the makeup of the product distribution. Hydrogen can be used to enhance the chemical reduction and suppress oxidation by means of the elemental oxygen in the feedstock. Steam can also be used as a pyrolyzing medium, allowing pyrolysis to occur at lower temperatures and higher pressures. The use of water as a pyrolyzing media also allows the feedstock to be introduced into the reactor in an aqueous form. An additional advantage of water or steam is that the resulting char has a relatively high surface area and porosity that is similar in nature to activated charcoal . Nitrogen gas can be supplied to maintain the inert atmosphere in the reactor and also to sweep away the pyrolyzed vapour product to the condensers. Furthermore, purging the system with nitrogen assists to minimise secondary reactions in the hot zone.
Henan Doing produced waste tyre pyrolysis plant can recycling all kinds of waste tire /tyre/plastic and convert waste tire/plastic to fuel oil ,carbon black and steel wire.
Contact: Ms Bonnie
Phone: +86-371-5677 1821
+86 15893800169
Skype: bonniezhao2
Email: oilmachine@doinggroup.com
www.wastetireoil.com
www.doinggroup.com
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