Energy & Fuels, Vol.31, No.11, 12407-12416, 2017
Utilization of Waste Heat Gas in a Converter Flue for CO Generation by Coal Injection
To reduce the amount of CO2 emissions from exhaust gas with a high temperature inside a flue of a converter, one new process, performed by injecting pulverized coal (PC) into the hotter gas using its waste heat gas to generate CO, is proposed. Numerical, experimental, and industrial investigations are conducted. The effects of the temperature, gas component, and coal size on the conversed effect of CO2 and O-2 were analyzed in the experiments, and the transient products were described during the PC injection using a high-temperature drop-tube furnace. The effects of the injecting angle and gun number on the mixed distribution of PC in flue gas were discussed by simulated analyses. The results show that the specific surface area of PC was 28.5620 m(2) g(-1), whereas the specific surface area of coke char (CC) was 13.6815 m(2) g(-1) using the Brunauer-Emmett-Teller method. The porosity volume V value of PC was 0.0113 mL g(-1) with an average porosity size of 0.8185 nm. The V value of CC was 0.0056 mL g(-1) with an average size of 0.7450 nm. The temperature affected gasification greatest compared to other factors; a better testing scheme was obtained after several industrial tests; and the O-2 and CO2 contents were reduced by 72.16 and 50%, while the CO and H-2 contents were increased by 21.08 and 216.7%, respectively.