Research on the coupling relationship between manufacturing technology innovation and energy consumption based on intelligent algorithms

In the current era, the energy consumption of the manufacturing industry is very serious. How to achieve optimal control of energy consumption in the manufacturing process with technological innovation as the driving force has become a current research hotspot. Based on this, this article has deeply studied the application of control technology in energy consumption management and control, and designed the sparse coupling relationship and analysis model based on the greedy optimization algorithm. From the aspects of conventional energy consumption, technical methods, output control and energy consumption in the manufacturing industry, based on production data, the optimal control strategy for energy consumption is analyzed and quantitatively evaluated through the greedy optimization algorithm. The results show that the energy consumption relationship analysis model based on the matching tracking algorithm has the advantages of high computational efficiency and high precision.

     

跨境氧化锌富集物能耗和收益分析及其应用前景

介绍了能耗评估和收益分析的概况,在跨境氧化锌富集物的特定生命周期,涵盖能源消耗、经济利用价值、投入产出效率等多维要素,通过计算实例对比分析了采用基于生命周期视角的综合能耗和基于eFootprint评价系统的生命周期能耗的评估差异。同时,围绕经济和环境两个角度,对评估对象进行了收益分析。研究表明,基于生命周期视角的综合能耗明显优于国标限额,收益分析呈现较好优势,能耗和收益分析方法体现出较为合理的评价效果,在健全再生资源评估体系和事后监管中具有良好应用前景。     

物理法COD减排理论极限能耗的热力学分析

首先针对系统的可持续性发展提出了三点本质要求,在此基础上提出了基于减排过程节能机制的热力学框架,并根据热力学第一、第二定律建立了计算物理法脱除有机污染物理论极限能耗的热力学分析方法.此外,以典型有机污染物的脱除为例,分别计算了封闭体系中298.15K和1.01325×105Pa下不同初始浓度、不同种类以及不同COD减排量的有机污染物脱除的理论极限能耗.本文的计算结果表明,废水中有机污染物的减排需要很高的能耗,脱除相同量有机污染物所需的理论极限能耗随着初始浓度的减小而显著增加,且不同种类污染物处理的难易程度和能耗高低相差很大,这充分说明减排与节能有着密不可分的联系,充分考虑污染物的种类、物理化学性质、毒性和浓度将有助于减排政策的科学制定.     

Theoretical limit of energy consumption for removal of organic contaminants in U.S. EPA Priority Pollutant List by NRTL,UNIQUAC and Wilson models

This paper quantifies the theoretical limit of energy consumption for the removal of 20 representative organic contaminants (9 chlorinated alkyl hydrocarbons, 3 chlorinated alkenes, 3 brominated methanes, 5 aromatic hydrocarbons and their derivatives) in the United States Environmental Protection Agency (U.S. EPA) Priority Pollutant List by physical procedures. The general rules of the theoretical limit of energy consumption with different initial concentrations at 298.15 K and 1.01325 × 10⁵ Pa by NRTL, UNIQUAC and Wilson models are obtained from the thermodynamic analysis with our previously established method based on the thermodynamic first and second law. The results show that the waste treatment process needs a high energy consumption and the theoretical limit of energy consumption for organic contaminant removal increases with decreasing initial concentrations in aqueous solutions. The theoretical limit of energy consumption decreases with the more C–H bonds being replaced by C–Cl or C–Br bonds in chlorinated methanes, ethanes, ethenes or brominated methanes except for 1,1,2,2-tetrachloroethane, and the energy consumption for the removal of chlorinated methanes is higher than that of chlorinated ethanes with the same C–H bonds being replaced by C–Cl bonds. For the removal of chlorinated ethenes, brominated methanes and benzene and its derivatives studied, the energy consumption has corresponding relationship with solubility and the energy consumption is higher for the removal of organics with higher solubility.     

面向能源领域的石墨烯研究

化石能源枯竭以及地球环境污染已经成为并且在未来相当长一段时期内都将是人类面临的最严峻的危机之一.因此,寻找清洁的替代能源形式、有效的能量存储方式以及高效的能源利用途径是目前科学研究的热点.自从其高质量样品被制备和研究以来,石墨烯一直吸引着全世界科研工作者的兴趣;它的一系列独特的物理化学性质,为其在能源领域的应用提供了无限前景.本文对石墨烯在能源领域的最新研究进展以及其工业化应用作了简要综述,具体内容包括石墨烯材料在以下领域的应用：能源储存器件类,如超级电容器和锂离子电池;能源转化装置类,如燃料电池和太阳能电池.     

Application of PCM thermal energy storage system to reduce building energy consumption

The building sector is known to make a large contribution to total energy consumption and CO₂ emissions. Phase change materials (PCMs) have been considered for thermal energy storage (TES) in buildings. They can balance out the discrepancies between energy demand and energy supply, which are temporally out of phase. However, traditional PCMs need special latent storage devices or containers to encapsulate the PCM, in order to store and release the latent heat of the PCM. The proper design of TES systems using a PCM requires quantitative information and knowledge about the heat transfer and phase change processes in the PCM. In Korea, radiant floor heating systems, which have traditionally been used in residential buildings, consume approximately 55% of the total residential building energy consumption in heating. This article reviews the development of available latent heat thermal energy storage technologies and discusses PCM application methods for residential building using radiant floor heating systems with the goal of reducing energy consumption.     

Thermodynamic analysis of the theoretical energy consumption in the removal of organic contaminants by physical methods

The essential requirements for evaluating the sustainable development of a system and the thermodynamic framework of the energy conservation mechanism in the waste-removal process are proposed.A thermodynamic method of analysis based on the first and second laws of thermodynamics is suggested as a means to analyze the theoretical energy consumption for the removal of organic contaminants by physical methods.Moreover,the theoretical energy consumption for the removal by physical methods of different kinds of...     

Evaluating of the exergy efficiency of the silicon production process using artificial neural networks

Abstract

In this study, the extent and effect of fluctuations in the proximate composition of carbon materials on specific electrical energy consumption and exergy efficiency in the production process of silicon furnaces was evaluated using a novel artificial neural network approach. The neural network architecture 4-5-2 with hyperbolic sigmoid in the hidden layer and linear function in the output layer was used. The proposed model successfully predicts the values of the specific electrical energy consumption and the exergy efficiency through the correlation coefficient (0.93 and 0.87) of the actual and predicted values for the various proximate compositions of carbon materials. The interactive effects of components in the mixtures of carbon materials were investigated via contour diagrams. Fixed carbon had the biggest impact on electrical energy consumption and exergy efficiency in the mixtures of carbon materials, followed by moisture. Compared with volatile matter from woodchips without any pretreatment, volatile matter from petcoke, charcoal, and coal had a significant effect on electrical energy consumption and exergy efficiency.     

Energy-related carbon dioxide emission forecasting of four European countries by employing data-driven methods

Journal of Thermal Analysis and Calorimetry - Carbon dioxide emission of countries is deeply dependent on the energy system. Share of different energy resources in primary energy consumption of the...     

Realization and characterization of flexible supercapacitors based on doped graphene electrodes

Journal of Solid State Electrochemistry - High energy consumption leads to the development of various energy types. As a result, the storage of these different types of energy becomes a key issue....     

Correlations for mixing energy in processes using Rushton turbine mixer

This study reports the research results on a mixing process using a stirred tank mixer under the action of a rotating magnetic field (RMF). Dimensionless correlations are proposed to predict the power consumption and mixing time for the mixing systems analysed. The results suggest that the mixing behaviour of the experimental set-ups tested may be assessed using the dimensionless mixing energy as the product of the power input and mixing time. In addition, an innovative strategy is proposed on the basis of the synergistic effect of the rotational Rushton turbine and the RMF generator. The values of the dimensionless energy thus obtained were used to compare the mixing process performed by the mixing devices tested. It is shown that the mixing process under the RMF action has significantly higher values of energy consumption than the conventional Rushton turbine. The total energy consumption for the mixing process performed by the RMF mixer may be reduced by concomitant use of a rotational agitator.     

Forecasting China’s natural gas consumption based on a combination model

Ensuring a sufficient energy supply is essential to a country. Natural gas constitutes a vital part in energy supply and therefore forecasting natural gas consumption reliably and accurately is an essential part of a country's energy policy. Over the years, studies have shown that a combinative model gives better projected results compared to a single model. In this study, we used Polynomial Curve and Moving Average Combination Projection (PCMACP) model to estimate the future natural gas consumption in China from 2009 to 2015. The new proposed PCMACP model shows more reliable and accurate results: its Mean Absolute Percentage Error (MAPE) is less than those of any previous models within the investigated range. According to the PCMACP model, the average annual growth rate will increase for the next 7 years and the amount of natural gas consumption will reach 171600 million cubic meters in 2015 in China.     

Forecasting China's natural gas consumption based on a combination model

Ensuring a sufficient energy supply is essential to a country. Natural gas constitutes a vital part in energy supply and therefore forecasting natural gas consumption reliably and accurately is an essential part of a country's energy policy. Over the years, studies have shown that a combinative model gives better projected results compared to a single model. In this study, we used Polynomial Curve and Moving Average Combination Projection (PCMACP) model to estimate the future natural gas consumption in China from 2009 to 2015. The new proposed PCMACP model shows more reliable and accurate results: its Mean Absolute Percentage Error (MAPE) is less than those of any previous models within the investigated range. According to the PCMACP model, the average annual growth rate will increase for the next 7 years and the amount of natural gas consumption will reach 171600 million cubic meters in 2015 in China.     

Thermodynamic analysis of waste heat recovery from hybrid system of proton exchange membrane fuel cell and vapor compression refrigeration cycle by recuperative organic Rankine cycle

Journal of Thermal Analysis and Calorimetry - According to day-by-day consumption increase, energy high costs and nonrenewable energy destroying effects, clean technologies such as fuel cells lead...     

Insights into electrochemical behavior and kinetics of NiP on PEDOT:PSS/reduced graphene oxide as high-performance electrodes for alkaline urea oxidation

Journal of Solid State Electrochemistry - Highly efficient, abundant, and low-cost materials are highly demanded for energy conversion applications to address the rising consumption of energy. In...     

Comparative Study on Energy Consumption and Yield by Various Thermal Plasma Routes for Production of Titania slag

In this paper, pre-reduced ilmenite concentrate of Indian region was processed successfully by thermal plasma routes to produce high titania slag. Effects of various parameters like time, yield and energy consumption, on TiO₂ and FeO content in the slag were studied. One of the main drawbacks of thermal plasma process is higher specific electrical power consumption, especially where power is costlier. So, the main focus is to reduce the energy consumption with better yield in various thermal plasma reactors. It is found that energy consumption decreases in respect to in-flight static bed plasma reactor. If the melting time kept within 2 min, the TiO₂ content and iron recovery increased, whereas melting time exceeds 2 min, low yield has been observed. At optimum conditions, TiO₂ content in the slag and the iron recovery are 84.5 and 80%, respectively. The phases before and after reduction, the sample were analyzed using X-ray diffraction.     

Energy requirements for the disintegration of cellulose fibers into cellulose nanofibers

Cellulose nanofibers have a bright future ahead as components of nano-engineered materials, as they are an abundant, renewable and sustainable resource with outstanding mechanical properties. However, before considering real-world applications, an efficient and energetically friendly production process needs to be developed that overcomes the extensive energy consumption of shear-based existing processes. This paper analyses how the charge content influences the mechanical energy that is needed to disintegrate a cellulose fiber. The introduction of charge groups (carboxylate) is achieved through periodate oxidation followed by chlorite oxidation reactions, carried out to different extents. Modified samples are then subjected to different levels of controlled mechanical energy and the yields of three different fractions, separated by size, are obtained. The process produces highly functionalized cellulose nanofibers based almost exclusively on chemical reactions, thus avoiding the use of intensive mechanical energy in the process and consequently reducing drastically the energy consumption.     

Analysis of a developed Brayton cycled CHP system using ORC and CAES based on first and second law of thermodynamics

Journal of Thermal Analysis and Calorimetry - In recent years, studying on energy production processes has been more popular by the sharp increasing trend of energy consumption and loss. One of the...     

Operation strategy for multi-stage pyrolysis

Pyrolysis has been extensively studied in past decades as its potential to convert organic wastes into bio-fuels. Pyrolysis is an overall endothermic process but preformed exothermically at its early stage. The overall energy consumption as well as the product quality and yield are affected by the heating rate and the operation temperature. In order to reach its full potential to produce bio-fuels, the energy consumption of the process has to be minimised. An idea to reduce the pyrolysis energy consumption is observed, which suggests trapping the exothermic heat released in the beginning of the pyrolysis process and using it to fulfil the energy requirement of the endothermic reactions at the end of the process. To achieve this, the pyrolysis has to be performed in multiple stages. The operation strategy of the multi-stage pyrolysis, including the number of stages, the operating conditions (e.g. process temperature, heating rate) and residence times of each stages, have to be carefully designed to obtain the most energy saving and the best product yield. The operating strategy of a pyrolysis process therefore greatly depends on the pyrolysis kinetics and the control of heat transfers. Waste tire pyrolysis is chosen as the study example in this paper. The corresponding reaction kinetics at different heating rates are investigated via experiments. Based on the experimental results, a mathematical model integrating kinetics and heat transfers is then developed. The objective of the model is to design a suitable operation strategy for the multi-stage pyrolysis process. A four-stage strategy is finally proposed for the tire pyrolysis, which has the sequence of heating, adiabatic, heating and adiabatic. The strategy is verified by the model, and it is capable to save about 22.5% energy consumption compared to the conventional strategy.     

Global energy and climate of the planet in the XXI century in the context of historical trends

The paper deals with global energy perspectives and forthcoming changes in the atmosphere and climate under the influence of anthropogenic and natural factors. In the framework of the historical approach to energy development the forecast of the future global energy consumption for the present century is made, and its resource base and the global consequences of the impact of the power sector on the atmosphere and climate on the background of natural factors are studied. It is shown that, following the historical tendency for global energy evolution, the global energy consumption by the end of the century will remain within 26 bln. tce, with CO₂ emissions peaking in the middle of the century. In this scenario, the CO₂ concentrations will not exceed 500 ppm, and the global temperature should rise by 1.5 degree by 2100, with the growth rate not exceeding the adaptation limits of the biosphere.