Energy recovery and abatement potential of CO_2 emissions for an integrated iron and steel making enterprise

The typical features for an integrated iron & steelmaking industry are high energy consumption and CO2 emission.The traditional BF-BOF process in an integrated Iron and steelmaking enterprise produces a large amount of residual heat and energy,which has great potential for recovery and abatement potential of CO2 emissions.In this paper,for an integrated Iron & steelmaking enterprise of 10 million tons per year in capacity,the residual heat and energy recovery analysis was conducted.It is indicateded that the residual heat and energy can be recovered as electric power by using present advanced process technology.By means of the distributed power generation,the residual heat and energy can be recovered,with a power generation capacity of 419.5 kWh per ton steel product.Accordingly,the abatement potential of CO2 emissions for an integrated iron & steel making enterprise was also evaluated,which indicated that about 398.5 kg CO2 could be reduced per ton steel product.

Scenario analysis on abating industrial process greenhouse gas emissions from adipic acid production in China

Adipic acid is an important petrochemical product,and its production process emits a high concentration of greenhouse gas N_2 O.This paper aims to provide quantitative references for relevant authorities to formulate greenhouse gas control roadmaps.The forecasting method of this paper is consistent with the published national inventory in terms of caliber.Based on the N_2 O abatement technical parameters of adipic acid and the production trend,this paper combines the scenario analysis and provides a measurement of comprehensive N_2 O abatement effect of the entire industry in China.Four future scenarios are assumed.The baseline scenario(BAUS) is a frozen scenario.Three emission abatement scenarios(ANAS,SNAS,and ENAS) are assumed under different strength of abatement driving parameters.The results show that China's adipic acid production process can achieve increasingly significant N_2 O emission abatement effects.Compared to the baseline scenario,by 2030,the N_2 O emission abatements of the three emission abatement scenarios can reach 207-399 kt and the emission abatement ratios can reach 32.5%-62.6%.By 2050,the N_2 O emission abatements for the three emission abatement scenarios can reach 387-540 kt and the emission abatement ratios can reach 71.4%-99.6%.

二氧化碳动态边际减排成本及其影响机制

二氧化碳边际减排成本可以反映环境质量与经济增长的关系,既是气候政策制定的科学基础,也是实现碳达峰、碳中和目标的关键因素。该研究基于三种方向性距离函数的行为模式构建三种二氧化碳边际减排成本的计算方法,测度中国30个省份(未涉及西藏和港澳台地区)1998—2019年间三种二氧化碳边际减排成本,并从全国、区域和省份三个层面进行分析。在进一步分析中,从减排空间和技术进步两个视角构建二氧化碳边际减排成本影响机制的理论框架,同时进行实证检验。测算结果表明:①经济主体从“传统-弱”模式时边际减排成本为负,从“传统-强”模式时边际减排成本趋近于零,从“弱-强”模式时边际减排成本均为正。②三种测量方法下边际减排成本均呈现上升、下降、上升的“N”型;区域规律一致,均为中部较高,东、西部较低;不同区域和省份间同一种边际减排成本的差别较大。影响机制的进一步分析显示:①减排空间和技术进步是影响二氧化碳边际减排成本的最为重要的两个因素,先后起主导作用。②只有当减排空间足够大,经济行为主体处于粗放型发展阶段和节能减排政策处在初始时期这两个条件同时满足时,节能减排政策才能起到降低边际减排成本的效果。③技术进步具有周期性。现阶段中国绿色技术处于快速发展的初步成长期,对技术的投入处于沉没成本阶段。虽然削减减排空间能够倒逼技术进步,但是技术进步并不能够起到显著降低减排成本的效果。因此,在减排政策的制定中要注重阶段性和区域差异,持续推进和完善碳排放权交易市场,考虑技术进步前期“沉默发酵”的特性,在中西部地区承接产业时要协调推进可持续发展。