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Reforming of converter gas with coke oven gas for thermochemical energy storage and carbon dioxide emission reduction
Fuel Processing Technology ( IF 7.2 ) Pub Date : 2021-07-22 , DOI: 10.1016/j.fuproc.2021.106957
Binglang Ren 1 , Guang Wang 1 , Haibin Zuo 1 , Qingguo Xue 1 , Xuefeng She 1 , Jingsong Wang 1
Affiliation  

During traditional processing and utilizing of converter gas, a common by-product gas of steel production, the recycling of waste heat is insufficient, carbon emission is high, and the added value of the gas is low. The reforming of converter gas with coke oven gas is proposed to utilize the gas more efficiently. The reforming recycles the waste heat of the gas by thermochemical energy storage technology and converts CH4 and CO2 into H2 and CO, which improves the recovery rate of the waste heat and gas added value, and reduces the direct emission of CO2. Thermodynamic equilibrium calculation and regression analysis were used to investigate the effects of the temperature, pressure, and mole fraction of coke oven gas on the results of the reforming. The results show that atmospheric pressure and the temperature range of 850 °C–1000 °C are suitable for the reforming, at which the conversion rates of CH4 and CO2 are more than 90% and 75%, respectively. The ratio of H2 to CO is determined by the mole fraction of coke oven gas. Then, the reforming process was investigated by experiments which simulated the reforming process in converter flue. The experimental results show that the in-suit catalysis of converter dust can significantly improve the conversion rates of CH4 and CO2 and the conversion rates can reach a high level at about 1000 °C. Then, the waste heat utilization of the reforming was investigated, and it was concluded that 35–40% of the waste heat is converted into chemical energy in the reforming. After the waste heat power generation of the product gas, the total recovery rate of waste heat is 60–65%. Finally, the amount of coke oven gas reformed by a fixed amount of converter gas without additional heating was calculated. The results show that when the preheating temperature of coke oven gas is 500 °C the range of 850 °C–900 °C is appropriate for the reforming, at which the conversion rate of CO2 is approximately 50% and about 40% of the waste heat was converted to chemical energy. For a steel plant with an annual output of 20 million, the direct emission of CO2 can reduce by 2.13 × 108 Nm3, and waste heat of 3.24 × 106 GJ can be converted into chemical energy.



中文翻译:

转炉煤气与焦炉煤气重整热化学储能和二氧化碳减排

转炉煤气是炼钢常见的副产煤气,传统加工利用过程中,余热回收不足,碳排放量高​​,煤气附加值低。建议用焦炉煤气对转炉煤气进行重整,以更有效地利用煤气。重整利用热化学储能技术回收气体余热,将CH 4和CO 2转化为H 2和CO,提高了余热和气体附加值的回收率,减少了CO 2的直接排放. 采用热力学平衡计算和回归分析研究了焦炉煤气的温度、压力和摩尔分数对重整结果的影响。结果表明,大气压和850°C-1000°C的温度范围适合重整,此时CH 4和CO 2的转化率分别大于90%和75%。H 2与CO的比率由焦炉气的摩尔分数决定。然后,通过模拟转炉烟道重整过程的实验研究了重整过程。实验结果表明,转炉粉尘的in-suit催化可显着提高CH 4和CO的转化率2,转化率可在1000℃左右达到较高水平。然后,考察了重整的余热利用情况,得出的结论是,35-40%的余热在重整中转化为化学能。产品气余热发电后,余热总回收率为60-65%。最后,计算了在不额外加热的情况下由固定量的转炉煤气重整的焦炉煤气量。结果表明,当焦炉煤气预热温度为 500 ℃时,850 ℃~900 ℃的范围适合重整,此时 CO 2的转化率约 50%,约 40% 的废热转化为化学能。对于年产2000万只钢厂,可减少CO 2直接排放量2.13×10 8  Nm 3,可将余热转化为化学能3.24×10 6 GJ。

更新日期:2021-07-22
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