Utilization of Waste Heat Gas in a Converter Flue for CO Generation by Coal Injection

Abstract

To reduce the amount of CO 2 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 CO 2 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 CO 2 contents were reduced by 72.16 and 50%, while the CO and H 2 contents were increased by 21.08 and 216.7%, respectively.

Fuel enhancement by conversion of hotter waste CO2 in flue gas with coke

“…Therefore, a new method to reduce the emissions of CO 2 and improve the utilisation efficiency of thermal energy is of great significance [14]. Zhou et al [15] proposed that the fine coke carried by nitrogen gas was injected into hotter flue gas to increase the calorific energy on the basis of carbon in coke reacting with CO 2 to generate CO using hotter thermal energy [16][17][18], and further to reduce CO 2 emissions into air [19].…”

“…Zhou et al. [15] proposed that the fine coke carried by nitrogen gas was injected into hotter flue gas to increase the calorific energy on the basis of carbon in coke reacting with CO 2 to generate CO using hotter thermal energy [16–18], and further to reduce CO 2 emissions into air [19].…”

Thermogravimetric and Kinetic Analysis of High-Temperature Thermal Conversion of Pine Wood Sawdust under CO2/Ar

“…However, establishing an efficient economically gasified facility is still a challenge because of external heat sources required for biomass pyrolysis. In the steelmaking industry, the converter steelmaking process continuously generates a large amount of converter flue gas with the maximum temperature about 1500 • C, with composition of 5-18% N 2 , 14-20% CO 2 , 50-70% CO, and less than 2% O 2 [25]. Therefore, the high temperature flue gas in converter vaporization cooling flue (CVCF) can provide excellent reaction conditions including heat source and gasifying agent for the gasification of biomass [26,27].…”