Heat distribution model under hydrogen-rich low-carbon conditions in blast furnace

Low carbon development of blast furnaces is one of the key technological directions in the current development of ironmaking.Owing to the differences in the physical and chemical properties of hydrogen and carbon,hydrogen-rich media entering a blast furnace will change the heat distribution,thus affecting the stability of production.Accordingly,a heat distribution model was proposed to study the temperature distribution in a blast furnace,simultaneously considering gas-solid heat exchange,slag and iron melting,and chemical reactions.The model was used to analyze the temperature distribution of a 2300 m^(3) blast furnace and was verified via comparison with actual production data.Subsequently,the effects of the injection rate of hydrogen-rich media,H2 concentration,and oxygen enrichment rate of the blast on the temperature distribution were investigated.Results indicated that the increase in the injection rate of the hydrogen-rich media decreased the amount of direct reduction and led to an increase in the furnace temperature.Furthermore,an increase in the oxygen enrichment rate led to a decrease in the furnace temperature,but could reduce the solid fuel ratio,while the change in H2 concentration had less effect on the temperature distribution.The combination of hydrogen-rich media injection and the increase in the oxygen enrichment rate would help to adjust the temperature distribution to the same level as the conventional blast furnace conditions.

Numerical investigation for effects of natural light and ventilation on 3D tomato body heat distribution in a Venlo greenhouse

Maintaining suitable temperature level around tomato in the greenhouse is essential for the high-quality production.However,in summer,the temperature level around the tomato is usually unclear except using a high-precision temperature imager.To solve this problem,thermal performance of 3D(three-dimensional)tomato model built based on SolidWorks was investigated by the computational fluid dynamics(CFD)simulations.To assess the effect of temperature distribution around the tomato,a simplified 3D tomato numerical model was firstly validated by a set of field measurement data.The light intensity and indoor ventilation were regarded as the mainly environment factors in the Venlo greenhouse,thermal stratification around tomatoes at different time of day was further studied.The numerical results illustrated the different temperature distribution around tomato body under different radiation intensity.It was found that ventilation could obviously adjust the temperature gradient around the tomato,and alleviate high temperature effect particularly in summer.Suitable ventilation could create a suitable thermal environment for the tomato growth.This study clearly demonstrated 3D temperature distribution around tomatoes,which is beneficial to provide the reference for accurate detection of 3D tomato temperature and appropriate thermal environment design.

考虑系统故障随机性的电热联合系统备用与DNE分布鲁棒协同优化调度

为实现电热联合系统的安全稳定运行,提高可再生能源消纳,提出考虑系统设备故障随机性的电热联合系统备用与“不超过”(DNE)分布鲁棒协同优化调度模型。首先,以常规机组和热电联产机组运行成本最小为综合优化目标,电功率平衡约束、热功率平衡约束等为约束条件,建立确定性电热联合系统优化调度模型;其次,在综合考虑风电功率、设备故障随机性以及DNE极限基础上建立电热联合系统分布鲁棒优化调度模型;最后,以修改的9节点系统为例,验证了所提模型可有效提高风电消纳率和系统的经济性。

Temperature field model in surface grinding: a comparative assessment

Grinding is a crucial process in machining workpieces because it plays a vital role in achieving the desired precision and surface quality.However,a significant technical challenge in grinding is the potential increase in temperature due to high specific energy,which can lead to surface thermal damage.Therefore,ensuring control over the surface integrity of workpieces during grinding becomes a critical concern.This necessitates the development of temperature field models that consider various parameters,such as workpiece materials,grinding wheels,grinding parameters,cooling methods,and media,to guide industrial production.This study thoroughly analyzes and summarizes grinding temperature field models.First,the theory of the grinding temperature field is investigated,classifying it into traditional models based on a continuous belt heat source and those based on a discrete heat source,depending on whether the heat source is uniform and continuous.Through this examination,a more accurate grinding temperature model that closely aligns with practical grinding conditions is derived.Subsequently,various grinding thermal models are summarized,including models for the heat source distribution,energy distribution proportional coefficient,and convective heat transfer coefficient.Through comprehensive research,the most widely recognized,utilized,and accurate model for each category is identified.The application of these grinding thermal models is reviewed,shedding light on the governing laws that dictate the influence of the heat source distribution,heat distribution,and convective heat transfer in the grinding arc zone on the grinding temperature field.Finally,considering the current issues in the field of grinding temperature,potential future research directions are proposed.The aim of this study is to provide theoretical guidance and technical support for predicting workpiece temperature and improving surface integrity.

A code-independent technique for computational verification of fluid mechanics and heat transfer problems

The goal of this paper is to present a versatile framework for solution verification of PDE＇s. We first generalize the Richardson Extrapolation technique to an optimized extrapolation solution procedure that constructs the best consistent solution from a set of two or three coarse grid solution in the discrete norm of choice. This technique generalizes the Least Square Extrapolation method introduced by one of the author and W. Shyy. We second establish the conditioning number of the problem in a reduced space that approximates the main feature of the numerical solution thanks to a sensitivity analysis. Overall our method produces an a posteriori error estimation in this reduced space of approximation. The key feature of our method is that our construction does not require an internal knowledge of the software neither the source code that produces the solution to be verified. It can be applied in principle as a postprocessing procedure to off the shelf commercial code. We demonstrate the robustness of our method with two steady problems that are separately an incompressible back step flow test case and a heat transfer problem for a battery. Our error estimate might be ultimately verified with a near by manufactured solution. While our pro- cedure is systematic and requires numerous computation of residuals, one can take advantage of distributed computing to get quickly the error estimate.

Comparison of Temperature Field Distribution between Cement Preclinkering Technology and Cement Precalcining Technology

Through the comparison of calcination conditions between cement preclinkering technology and cement precalcining technology,we studied the characteristics of temperature field distribution of cement preclinkering technology systems including cyclone preheater,preclinkering furnace,and rotary kiln.We used numericalsimulation method to obtain data of temperature field distribution.Some results are found by system study.The ratio of tailcoalof cement preclinkering technology is about 70%,and raw mealtemperature can reach 1070 ℃.Shorter L/D kiln type of preclinkering technology can obtain more stable calcining zone temperature.The highest solid temperature of cement preclinkering technology is higher than 80 ℃,and high temperature region（〉1450 ℃）length is 2 times,which is beneficialfor calcining clinker and higher clinker quality.So cement preclinkering technology can obtain more performance temperature filed,which improves both the solid-phase reaction and liquid-phase reaction.

NUMERICAL CALCULATION FOR 2-DIMENSIONAL HEAT TRANSFER IN KEYHOLE LASER WELDING

A numerical method is presented for analysing 2 dimensional quasi steady state heat transfer in high power density laser keyhole welding processes. The mathematical model is established according to the conservation of mass, momentum and energy. Computation is performed by using the finite control volume method in the curvilinear coordinate system. A position prediction correction procedure is employed to identify the solid liquid interface location. This method is applied to the study of a typical keyhole welding process of an AISI 304 stainless steel plate and its feasibility is verified.

考虑单峰分布的电热综合能源系统风险调度

不确定可再生能源并入电热综合能源系统后将引发系统运行风险,而通过合理量化风险,实现风险可控性和调度经济性平衡是电热综合能源系统风险调度的关键。依据随机风电功率的单峰分布特性构建矩模糊集并以此刻画风电功率的不确定性,同时采用分布鲁棒机会约束方法来刻画系统的运行风险,进而建立了电热综合能源系统的分布鲁棒风险调度模型。在此基础上,从风险发生概率和经济成本的角度,提出了评估不确定风电功率引发运行风险的量化指标:均值风险概率和风险调度成本。最后,以改进的巴厘岛电热综合能源系统为例进行算例分析,验证了所提模型及其风险评估指标的可行性和有效性,并给出了电热综合能源系统的最优调度决策。

计及热惯性的热电联产虚拟电厂韧性提升策略

日益频繁的极端天气给电热耦合系统造成的影响愈发严重。韧性是衡量系统抵御极端事件、减少故障影响并快速恢复的核心指标。为提升电热耦合系统抵御极端灾害的能力,提出一种考虑热惯性的热电联产虚拟电厂(combined heat and power-virtual power plant,CHP-VPP)两阶段三层韧性提升策略。第一阶段以联络开关成本最小为目标,基于最小生成树理论对系统进行重构;第二阶段以运行成本最小为目标,基于分布鲁棒优化理论制定最恶劣的故障场景下的最优决策。采用列与约束生成算法进行迭代求解。基于IEEE 33节点电力系统+6节点供热系统构建CHP-VPP测试系统,仿真结果表明,所提出的方法可有效提升CHP-VPP应对极端灾害的韧性。

基于分布鲁棒的风-氢混合系统氢储能容量优化配置

氢储能系统受地理、气候条件限制较小,在构建面向高比例新能源电力系统的风-储混合系统中极具发展潜力。然而,由于风电场的出力具有不确定性,氢储能系统需要在储能、释能、热备用等工况下频繁切换,内部热能供需平衡也呈现出不确定性,进而影响其响应速度甚至实际可用容量。为此,设计了考虑热平衡的风-氢混合系统,构建了考虑电解槽、燃料电池间歇工作模式热平衡的氢储能系统模型;在此基础上,综合考虑风电场功率的不确定性和氢储能系统的投资成本,提出了考虑热平衡不确定性的风-氢混合系统氢储能容量优化配置方法。采用分布鲁棒方法对风电场功率的不确定性进行建模,并将其转化为一组线性风险机会约束进行求解。基于实际风电场数据构建算例,对所提模型和方法进行验证和分析。结果表明,氢储能系统中电解槽和燃料电池的散热系数对系统实际可用容量具有重要的影响,在风-氢混合系统的氢储能容量配置中考虑热平衡约束可以有效提升氢储能系统的实际可用容量和混合系统的经济性。

考虑氢储能热平衡的风-氢混合系统优化调度方法

风-氢混合系统(W-HHS)参与电网调度时,氢储能系统(HESS)间歇工作的热能需求特性成为影响系统调度的关键因素。建立了具备余热利用系统的HESS模型,在HESS热量平衡和热功率平衡约束下,提出了以提高W-HHS运行收益为目标,满足混合系统输出功率跟踪电网调度曲线约束的W-HHS优化调度方法。最后,通过青海风电场数据对所提方法和模型进行了验证和分析。结果表明,HESS热平衡约束对W-HHS运行调度具有重要影响,所提方法能提高W-HHS运行的可靠性。参数分析说明,减小散热系数能够降低热平衡约束对W-HHS调度策略的影响,提高风电场并网功率。

基于分布鲁棒优化的电–气–热综合能源系统日前经济调度

风电等可再生能源的出力具有不确定性,传统的鲁棒优化和随机优化方法在处理风电等可再生能源出力不确定性时都存在一些局限与不足。基于分布鲁棒优化研究了考虑风电出力不确定性的电-气-热综合能源系统(electricity-gas-heat integrated energy system,EGH-IES)日前经济调度问题。将Kullback-Leibler(KL)散度作为分布函数与参考分布之间距离的量度,建立风电出力的分布函数集合。然后以系统运行总成本作为目标函数,建立了EGH-IES日前经济调度鲁棒机会约束优化模型。将所建立的鲁棒机会约束优化模型转化为利用求解器可直接求解的确定性混合整数线性优化模型。最后,通过算例分析验证了所提方法的有效性,并分析了电转气技术和热网管道输送延时对风电消纳的作用。

Collaborative Planning of Distributed Wind Power Generation and Distribution Network with Large-scale Heat Pumps

With the advancement of clean heating projects and the integration of large-scale distributed heat pumps into rural distribution networks in northern China,power grid companies face tremendous pressure to invest in power grid upgrades,which bring opportunities for renewable power generation integration.The combination of heating by distributed renewable energy with the flexible operation of heat pumps is a feasible alternative for dealing with grid reinforcement challenges resulting from heating electrification.In this paper,a mathematical model of the collaborative planning of distributed wind power generation(DWPG)and distribution network with large-scale heat pumps is developed.In this model,the operational flexibility of the heat pump load is fully considered and the requirements of a comfortable indoor temperature are met.By applying this model,the goals of not only increasing the profit of DWPG but also reducing the cost of the power grid upgrade can be achieved.

The characteristics of sea fog with different airflow over the Huanghai Sea in boreal spring

Using the observations from ICOADS datasets and contemporaneous NCEP/NCAR reanalysis datasets during 1960-2002,the study classifies the airflows in favor of sea fog over the Huanghai （Yellow） Sea in boreal spring （April-May） with the method of trajectory analysis,and analyzes the changes of proportions of warm and cold sea fogs along different paths of airflow.According to the heat balance equation,we investigate the relationships between the marine meteorological conditions and the proportion of warm and cold sea fog along different airflow paths.The major results are summarized as follows.（1） Sea fogs over the Huanghai Sea in spring are not only warm fog but also cold fog.The proportion of warm fog only accounts for 44% in April,while increases as high as 57% in May.（2） Four primary airflow paths leading to spring sea fog are identified.They are originated from the northwest,east,southeast and southwest of the Huanghai Sea,respectively.The occurrence ratios of the warm sea fog along the east and southeast airflow paths are high of 55% and 70%,while these along the southwest and northwest airflow paths are merely 17.9% and 50%.（3） The key physical processes governing the warm/cold sea fog are heat advection transport,longwave radiation cooling at fog top,solar shortwave warming and latent heat flux between airsea interfaces.（4） The characteristics of sea fog along the four airflow paths relate closely to the conditions of water vapor advection,and the vertical distribution of relative humidity.

考虑相变储能与建筑蓄能特性的微网分布鲁棒优化调度

基于相变材料特性建立相变储能水箱热力学模型;分析建筑负荷特性,建立建筑室内温度动态模型;运用基于Wasserstein距离的分布鲁棒算法,建立风电预测误差不确定集。提出考虑相变储能与建筑蓄能特性的微网两阶段分布鲁棒优化调度模型。模型第1阶段是基于风电预测信息,制定日前调度计划,第2阶段考虑风电预测误差,在最恶劣概率分布条件下,获得日内调度计划。最后,运用算例分析相变储能水箱与建筑蓄能特性对风电消纳以及系统调度的影响,并验证分布鲁棒模型的有效性。

市场环境下考虑多元不确定性的热电联合虚拟电厂竞标策略

“双碳”背景下,热电联合虚拟电厂将热电联产机组、储能设施等聚合为可控集合体以促进新能源消纳,具有广阔的发展空间。电力市场环境下,热电联合虚拟电厂的竞标策略决定了其在市场中的购售电量,对其收益具有重要影响。然而,电价和分布式新能源出力等多元不确定性的存在,给热电联合虚拟电厂竞标策略的制定带来困难。为此,提出了市场环境下考虑多元不确定性的热电联合虚拟电厂竞标策略。考虑电价与虚拟电厂内部风光的不确定性,建立热电联合虚拟电厂参与电力市场的竞标模型。利用蒙特卡洛法和后向场景缩减法,构建刻画电价不确定性的典型场景。基于此,结合随机优化方法与基于Wasserstein距离的分布鲁棒方法,将热电联合虚拟电厂竞标模型转换为分布鲁棒随机优化模型,并利用对偶转换和数据驱动方法将该模型转换为单层模型,以利于求解。最后,通过IEEE 30节点系统验证所提方法的有效性。

Engine performance analysis and optimization of a dual-mode scramjet with varied inlet conditions

A dual-mode scramjet can operate in a wide range of flight conditions. Higher thrust can be generated by adopting suitable combustion modes. Based on the net thrust, an analysis and preliminary optimal design of a kerosene-fueled parameterized dual-mode scramjet at a cru- cial flight Mach number of 6 were investigated by using a modified quasi-one-dimensional method and simulated annealing strategy. Engine structure and heat release distrib- utions, affecting the engine thrust, were chosen as analytical parameters for varied inlet conditions （isolator entrance Mach number： 1.5-3.5）. Results show that different opti- mal heat release distributions and structural conditions can be obtained at five different inlet conditions. The highest net thrust of the parameterized dual-mode engine can be achieved by a subsonic combustion mode at an isolator entrance Mach number of 2.5. Additionally, the effects of heat release and scramjet structure on net thrust have been discussed. The present results and the developed analytical method can provide guidance for the design and optimization of high-performance dual-mode scramjets.

Comparative Study on Heat Flux and Temperature Distribution Performance of Linear Fresnel Collector Based on Uniformity Index

Linear Fresnel collector system as main solar energy collecting technology is widely studied.The secondary reflector has significant influence on the heat flux distribution on the linear Fresnel collector.In this work,the heat flux and temperature distribution on linear Fresnel collector is compared with different secondary reflectors of simple trapezoidal concentrator,segmented parabolic concentrator and compound parabolic concentrator under varied incident ray angle.The uniformity index is applied to evaluate the Linear Fresnel reflector system heat flux distribution performance.The results show that the value of uniformity index increases with the increasing of incident ray angle.The compound parabolic concentrator has the highest value of uniformity index compared with simple trapezoidal concentrator and segmented parabolic concentrator in this work.The highest value of uniformity index is 0.8137 with compound parabolic concentrator.This work provides effective and practical guide to design and evaluate the secondary reflector in linear Fresnel reflector system.

城市电热综合能源系统分布式鲁棒经济调度

可再生能源波动性和热力系统运行特性对城市电热综合能源系统的经济调度影响显著。基于分布式鲁棒理论、热力管网和分布式蓄热设备的介质温度特性,提出了一种城市电热综合能源系统分布式鲁棒经济调度模型。通过合理利用热力系统灵活调控特性,可有效降低运行成本、提高风电消纳水平。同时,通过分布式鲁棒优化理论,得到可再生能源出力最恶劣概率分布下的经济调度方案,有效提升风电消纳的安全性。最后,通过算例验证了所提模型的有效性。

Establishment of a Static Model Based on Measured Heat Loss for COREX Process

The heat loss and its,distribution are of great importance for the calculation and simulation of COREX process. Based on Baosteel COREX process, a method was applied to measure the heat loss of the furnace shell, the accessory equipments and the cooling water system. Then, a static model was established based on the measured heat loss of COREX process. The results showed that the main heat loss of furnace shells took place at the dome of the COREX melter-gasifier and the reducing gas entrance position of the shaft furnace while the main heat loss caused by cooling water occurred at the tap hole area. And the heat loss caused by cooling water accounts for about 85% of the total heat loss in COREX process. The measured total heat loss for producing every 1 t hot metal was 542. 164 MJ, which accounted for about 92 % of the theoretical total heat loss.