Steam gasification of waste tyre: Influence of process temperature on yield and product composition

Abstract

An experimental survey of waste tyre gasification with steam as oxidizing agent has been conducted in a continuous bench scale reactor, with the aim of studying the influence of the process temperature on the yield and the composition of the products; the tests have been performed at three different temperatures, in the range of 850-1000°C, holding all the other operational parameters (pressure, carrier gas flow, solid residence time). The experimental results show that the process seems promising in view of obtaining a good quality syngas, indicating that a higher temperature results in a higher syngas production (86 wt%) and a lower char yield, due to an enhancement of the solid-gas phase reactions with the temperature. Higher temperatures clearly result in higher hydrogen concentrations: the hydrogen content rapidly increases, attaining values higher than 65% v/v, while methane and ethylene gradually decrease over the range of the temperatures; carbon monoxide and dioxide instead, after an initial increase, show a nearly constant concentration at 1000°C. Furthermore, in regards to the elemental composition of the synthesis gas, as the temperature increases, the carbon content continuously decreases, while the oxygen content increases; the hydrogen, being the main component of the gas fraction and having a small atomic weight, is responsible for the progressive reduction of the gas density at higher temperature.

Effect of combined slow pyrolysis and steam gasification of sugarcane bagasse on hydrogen generation

“…Similar to the current work, they also noticed higher H 2 and lower CH 4 , CO composition for steam gasification. Table 6 compares the findings of the current study to earlier studies [50][51][52][53].…”

Scrap Tyre Management Pathways and Their Use as a Fuel—A Review

“…Gasification reactors come in various styles such as fixed bed, fluidised bed, and entrained bed reactors. A few studies have been conducted on scrap tyre gasification [62][63][64][65][66][67][68][69].…”

“…Various agents such as steam, air/CO 2 , and air/steam can be used in tyre gasification processing; steam resulted in a low heating value gas of 15.21 MJ·m −3 [68]. In regards to increasing temperature in tyre gasification, gas production is enhanced [69].…”

Gasification of wastes: The impact of the feedstock type and co‐gasification on the formation of volatiles and char

“…Tire pyrolysis produced higher contents of the CO 2 and C 2 H 6 (45.45 and 31.57 wt%, respectively), because of the quicker melting (melting point of 600°C) and vaporization of tire, reducing the residence time of the vapor produced in the oxidation and reduction zones of the reactor …”