Co-combustion behavior of waste plastics and blast furnace injection coal and its influence on theoretical combustion temperature
The injection of waste plastics into the blast furnace is an effective method for recycling and efficiently treating large quantities of plastic wastes.The co-combustion behavior of plastic with coal and its impact on the thermal state of the raceway zone was systematically studied.The results indicate that waste plastics injected into the blast furnace offer advantages such as high volatile content,lower ash content,and good combustion performance.The injection of waste plastics into the blast furnace can increase the bosh gas volume and partially reduce the theoretical combustion temperature.Based on the experimental and theoretical calculations,replacing 20％anthracite with waste plastic as a mixed injection ratio is a more suitable approach for enhancing the combustion intensity and efficiency of the injected fuel,as well as stabilizing the theoretical combustion temperature.Additionally,injecting waste plastics into the blast furnace can increase the gas volume and the(H2+CO)ratio within a reasonable range,which promotes indirect reduction and reduces the coke ratio.This approach offers an effective pathway to optimize the fuel structure of blast furnace injection and achieve low-carbon and green development.
blast furnacewaste plasticcombustionraceway zonetheoretical combustion temperature
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