In view of the problems such as the relatively small proportion of feasibility and sustainability indicators in the allocation of carbon emission, and the lack of potential analysis for regions lacking carbon quotas after allocation, a study on carbon quota allocation and emission reduction potential of provinces was carried out. Under the target of carbon peaking, a multi-index system was constructed, taking into account the principles of fairness, efficiency, feasibility and sustainability. The entropy method and ZSG-DEA method were combined to obtain and optimize the quota allocation results. Based on the results of carbon emission spatial balance, emission reduction potential models were developed to evaluate the emission reduction potential under different preference scenarios. The applicability of the model is verified by analyzing the behavior of non-ferrous metals industry. The results show that the regions with a prosperous non-ferrous metals industry have a high proportion of carbon quota and significant differences in emission reduction potential, showing a distribution pattern of "high in southeast and low in northwest", with variations among provinces. The research findings can provide a way to improve the carbon quota allocation process for non-ferrous metal industry in different provinces.
In the context of the dual carbon strategy, efficient recyclingRecycling and utilization of waste heat from aluminum electrolysisAluminum electrolysis cellsCell is one of the implementation paths for the aluminum electrolysisAluminum electrolysis industry to achieve deep energyEnergy conservation and carbon reduction. In response to the technical bottleneck problem of difficult recoveryRecovery of waste heat on the side of aluminumAluminum electrolytic cellsCell, a dedicated heat exchanger for waste heat recoveryWaste heat recovery on the side of the electrolytic cellCell has been developed. The flow rate of the heat transferring medium in the heat exchanger has been optimized and controlled, and the heat extraction rate has been adjusted to ensure stable operationOperation of the electrolytic cellCell without affecting it. The radiant heat on the side of the electrolytic cellCell shell has been efficiently recovered. The technology was tested in an industrial scale on a 200 kA test cellCell. The results showed that the overall operationOperation of the aluminum electrolysisAluminum electrolysis cellCell waste heat recoveryWaste heat recovery system was stable and efficient, with an average heat recoveryRecovery of 77 734 kJ/h, equivalent to 21.59 kWh, 317 kWh per ton of aluminumAluminum, and a heat recovery efficiencyHeat recovery efficiency of 99.71
通过研究某金矿的全尾砂基本性质,采用博乐飞RSR-SST型流变测试仪测定其膏体料浆的流变参数,获取流变曲线并分析其变化过程.利用BP神经网络原理,建立了以料浆质量浓度X1、灰砂比X2、容重X3和扩展度X4影响因素,屈服应力Y1和塑性黏度Y2两个流变参数的流变模型.结果表明:料浆质量浓度是影响流变特性的主要因素,料浆的扩展度次之,灰砂比和料浆容重影响最小;当质量浓度处于72％～74％时,灰砂比、料浆容重和扩展度对流变参数影响较小;全尾砂膏体流变参数随着料浆质量浓度、灰砂比呈线性增长;建立的流变函数模型在预测金矿充填料浆流变特性参数中的误差在可控范围、准确性高,可为管输沿程阻力计算、井下充填管网布置提供依据.
为探求充填过程中多次充填产生不同倾角充填面对充填体产生的影响,制备含不同倾角结构面的胶结充填体(CTB)试件以及完整试件,并采用分离式霍普金森压杆(SHPB),对CTB试件进行单次与循环冲击破坏试验.试验得出:在单次冲击试验中,完整试件峰值应变和平均应变率小于含结构面倾角的试件,随着试件倾角的增加,试件的动态抗压强度逐渐降低;含结构面倾角试件表现出两种不同的应力-应变曲线特征.循环冲击试验下,结构面倾角越大试件抵抗冲击的能力越弱;含结构面倾角试件在第一次循环冲击下的应力-应变曲线与完整试件特征一致,而当循环次数增加时,应力-应变曲线特征与单次冲击下类似,在达到动态峰值应力前后,出现了显著的低应力波峰现象.随着结构面倾角的增加,充填体基体之间结构的致密性降低,导致结构面上裂纹数量的增多以及裂纹宽度的扩大,在微观结构上验证了结构面倾角的增加会引起结构面处剪应力的增大及充填体破坏模式发生改变,同时充填体容易沿着结构面处发生断裂.
为了探究空孔对爆生裂纹扩展的影响,结合ANSYS/LS-DYNA有限元软件建立了空孔爆破损伤模型,理论上推导了空孔附近的岩体质点应力分布方程,分析了空孔效应对于破碎机理与裂纹扩展的影响.结果表明:空孔自由面效应会在空孔附近引起冲击压力骤增和震速变化,出现迎爆面处岩石"片落"现象;空孔背爆面处的震速明显小于迎爆面的震速,说明空孔具有很好的泄压降震效果;通过对冲击压力和裂隙区半径的解析解计算与数值计算结果对比,冲击压力的误差11.81％,而裂隙区半径的误差9.49％,两者结果较为接近.
