ENGINEERING TECHNOLOGY

Dedicated to a new chapter – a special issue to celebrate the 90th anniversary of the Department of Energy and Power Engineering of Tsinghua University


In 2022, in order to welcome the 90th anniversary of the Department of Energy and Power Engineering of Tsinghua University, the Journal of Tsinghua University (Natural Science Edition) organized a special issue with 9 reviews and 6 papers selected to report and display the latest important research progress made by the Department of Energy and Power Engineering of Tsinghua University in the fields of basic science and key core technologies. At present, the Department of Energy and Power Engineering is seizing the great opportunity of the national energy structure transformation and energy and power technology revolution, aiming at the strategic goal of “carbon peaking and carbon neutrality”, and steadily advancing towards the forefront of world-class disciplines.

For details, please read the Journal of Tsinghua University (Natural Science Edition), Issue 4, 2022, “Special Issue on the 90th Anniversary of the Department of Energy and Power Engineering of Tsinghua University”, identify the QR code below or click ithttp://jst.tsinghuajournals.com/CN/volumn/volumn_4312.shtmlto view the full article.

Review

01 Research progress on key heat mass transport issues in oil/gas/heat utilization technology of carbon dioxide geological storage and production enhancement

Xu Ruina,Ji Tiancheng,Lu Taojie,Jiang Peixue

Carbon capture, utilization and storage (CCUS) refers to the technology of separating CO2 from energy use, industrial production or the atmosphere, purifying and transporting it to usable or storage sites to achieve long-term separation of captured CO2 from the atmosphere. The United Nations Intergovernmental Panel on Climate Change (IPCC) recently pointed out in a report that CCUS technology is a “foundation” technology for carbon emission reduction and carbon neutrality. Under the background of China’s “dual carbon” goal of carbon peaking and carbon neutrality, CCUS technology is considered to be one of the indispensable key technologies for China to achieve the goal of carbon neutrality. This paper reviews the key heat mass transport problems in the process of CO2 geological storage, increased production of tight oil/shale gas/deep geothermal extraction in recent years, and uses molecular dynamics, lattice Boltzmann, computational fluid dynamics and other simulation methods, and microscopic pore scale visualization experiments, core scale nuclear magnetic resonance experiments, supercritical pressure fluid convection heat transfer experiments and other experimental methods through theoretical analysis. The multiphase and multi-component flow and heat-mass transport mechanism of supercritical CO2 in micro-nanoporous structure under reservoir conditions were expounded from different scales, and the influence laws of mineral reaction, depressurization precipitation, fluid variability and scale effect on CO2 geological storage, oil displacement, gas displacement and heat recovery were analyzed, so as to provide theoretical and technical support for the application of CO2 geological storage and utilization.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/634

02 Progress in hydrogen production technology from fossil energy and renewable energy for energy transition

LI Shuang,SHI Yixiang,CAI Ningsheng

Hydrogen energy is a secondary energy source with abundant sources, green and low-carbon and wide application, and is gradually becoming one of the important carriers for the green transformation and development of energy in the future, a useful supplement to existing energy forms, and an important part of the future energy system. This paper introduces the series of basic research and application development achievements made by the Department of Energy and Power Engineering of Tsinghua University in the field of hydrogen production. In the field of hydrocarbon fuel reforming, a universal catalyst for pyrochlore-supported reforming was synthesized and a full range of reforming hydrogen production prototypes were developed. In the field of medium-temperature hydrogen purification, a new way of medium-temperature purification was proposed, and a nitrogen-based activated carbon hydrophobic adsorbent and hydrotalcite-based adsorbent covering the full temperature zone were synthesized, and the demonstration of medium-temperature pressure swing adsorption H2/CO2 separation technology was completed. In the field of renewable energy electrolysis, relying on the solid oxide electrolysis cell to achieve the co-electrolysis of carbon dioxide and water to produce fuel, increase the reaction temperature to reduce the theoretical decomposition voltage of water, thereby reducing the energy consumption of alkaline water electrolysis. The development of hydrogen production technology is the primary technical link of the hydrogen fuel cell industry, which will help promote the transformation of future energy utilization and is an important measure to build a low-carbon, safe and efficient modern energy system.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/655

03 Progress in the study of combustion reaction kinetics oriented towards carbon neutrality and advanced power

YANG Bin,LIU Zhongkai,LIN Keli,LIAO Wanxiong,WANG Qiao

Clean combustion of zero-carbon and low-carbon fuels such as hydrogen, ammonia, electronic fuels, and biofuels is an objective choice to achieve the goal of carbon neutrality. The efficient combustion of synthetic jet coal, polycyclic hydrocarbons and multi-blended fuels is closely related to the development of advanced aerospace power. The combustion reaction kinetics of these new fuels are the basis for a deep understanding of their combustion processes and the development of new combustion organization models and burners. At present, there are still many challenges in establishing predictive dynamics models for new fuels: on the one hand, there is an urgent need for accurate experimental data under a wide range of conditions, especially extreme conditions and multiphysics conditions; On the other hand, efficient combustion reaction kinetic model analysis and optimization methods are required. In this paper, the basic experimental methods and model analysis and optimization methods of combustion reaction kinetics developed by this research team in recent years are reviewed, including the acquisition of more detailed combustion component information, the measurement of fuel ignition data at lower temperatures, the component diagnosis of plasma-assisted combustion, and the dimensionality reduction, sensitivity and uncertainty analysis, experimental design, model optimization and simplification methods of combustion reaction kinetic models.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/663

04 Future fluid machinery technology that supports the “dual carbon” goal

LUO Xianwu,YE Weixiang,SONG Xueyi,GENG Chen

Fluid machinery is a large amount of equipment, as a power generation equipment for China to produce green and clean energy more than 16% of the total social electricity consumption every year, and as a power equipment to consume nearly 30% of the total social electricity consumption, so it is necessary to develop advanced and efficient fluid machinery technology, by enhancing the wide area stable operation capacity of hydropower and pumped storage units to promote the rapid growth of wind power, photovoltaic and other intermittent renewable energy, through design optimization and intelligent regulation to improve the energy-saving level of fluid machinery system, effectively support the smooth realization of China” “Dual carbon” strategic goal. In view of the major needs related to fluid machinery in China’s social development, this paper discusses the technical development direction and challenges of fluid machinery and engineering disciplines from the aspects of eco-friendly high-efficiency hydropower generation technology, safe and stable pumped storage technology, green and environmentally friendly pump, fan and wind turbine technology, and fluid machinery design optimization and intelligent operation technology, summarizes the current hot research and progress of fluid machinery, and provides reference for the research and development of key technologies of fluid machinery in the future.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/678

05 Organic Rankine cycle of non-azeotropic working fluids driven by medium and low temperature thermal energy

LI Jian,YANG Zhen,DUAN Yuanyuan

The organic Rankine cycle (ORC) is one of the mainstream technologies to achieve efficient thermal work conversion of medium and low temperature thermal energy below 200 °C. Non-azeotropic working fluids can effectively reduce heat exchange losses, realize the complementary advantages of component performance, and expand the selection range of working fluids, which is becoming a new trend in the field of ORC research and application. This paper summarizes the research progress of the author’s team in the optimization design and performance analysis of non-azeotropic ORC system, and introduces a double-pressure evaporation cycle on the basis of conventional non-azeotropic ORC to improve the temperature matching of the evaporation process and significantly reduce the heat transfer loss. The introduction of the separating condensation method improves the condensation heat transfer performance of non-azeotropic working fluids and greatly reduces system costs. In general, the non-azeotropic working fluid can significantly improve the thermal performance of the ORC system, and the liquid separation condensation method can effectively solve the defects of large heat exchange area and poor thermal economic performance. Therefore, non-azeotropic working fluids have broad application prospects in ORC systems.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/693

06 Gas-solid reaction kinetic rate equation theory

LI Zhenshan, CAI Ningsheng

Aiming at the frontier direction of cross-scale calculation of gas-solid reactions, this paper proposes a first-principles rate equation theory from the mesoscopic grain level, solves the problem that scale correlation and reaction/diffusion coupling cannot be achieved in the original theory, constructs a cross-scale gas-solid reaction kinetic theoretical model of “atomic→ grain → particles”, reveals the discrete island growth mechanism of solid products on the surface, designs efficient and reliable calculation and analysis methods, and applies them to cross-scale oxidation of low-energy CO2 capture and concentrated chemical chain combustion. Reduction reaction kinetics, surface interface reaction phenomenon and mechanism in new thermochemical heat storage, cross-scale calculation of pollutant removal technology, numerical simulation of coal and coke combustion, design and optimization of dual fluidized bed reactor and other technical fields.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/704

07 Basic research and application of heavy oil air injection development technology

Shi Lin, Xu Qianghui

Heavy oil isOne of the important replacement energy sources in the future has the characteristics of high viscosity, large reserves and high mining difficulty. Heavy oil air injection development technology is a major strategic successor technology for China’s heavy oil development It has the significant advantages of in-situ heat generation, high recovery and green and low-carbon, but its underground physical and chemical processes are extremely complex and the corresponding basic research work is still weak. Since the “Twelfth Five-Year Plan”, our research group has gradually carried out basic scientific research and engineering application exploration of heavy oil air injection technology in the research directions of “characteristics and influencing factors of low-temperature oxidation and exothermic heat release in heavy oil”, “formation and physicochemical properties of high-temperature oxidized fuel (coke)”, “pseudo-component reaction kinetic model of heavy oil oxidation”, “multi-physical chemical field coupling mechanism of high-temperature oxidation leading edge”, “coupling and transfer law of ‘thermal fluidization’ in oil reservoirs at the well group scale”. An experimental device and method for measuring the law of oxidative heat release of heavy oil, product properties and seepage parameters were established A numerical simulation method for the coupling process of heavy oil oxidation “thermal fluidization” of multi-scale was constructed, and these research results effectively promoted the progress of air injection technology in basic research and engineering application of heavy oil injection technology in China.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/722

08 Development history and prospect of desulfurization gypsum improved saline-alkali soil technology

Zhao Yongdao, Wang Shujuan, Li Yan, Liu Jia, Yuqun Yu

The use of desulfurization gypsum to improve saline-alkali soil not only opens up a new way for the resource utilization of desulfurization gypsum, but also provides a new method for the improvement of saline-alkali soil. This paper reviews the origin and development process of using desulfurization gypsum to improve saline-alkali soil technology for more than 20 years, and systematically summarizes the basic theory, key technologies, short-term and long-term effects, environmental safety and industrial application practice of desulfurization gypsum to improve saline-alkali soil. In order to make better use of desulfurization gypsum for efficient and safe treatment of large-scale saline-alkali soil in China, it is recommended to reduce the amount of desulfurization gypsum applied per unit land area, increase the long-term positioning test points and formulate national standards for the agricultural application of desulfurization gypsum.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/735

09 Research progress of artificial heart in the Department of Energy and Power Engineering, Tsinghua University

HUANG Bo,LI Haoyuan,LU Bin,ZUO Zhigang,LUO Xianwu,LIU Shuhong

As the latest generation of artificial hearts, centrifugal blood pumps provide an effective life support system for patients with cardiovascular disease and have saved the lives of millions of patients with heart disease. This paper introduces in detail the R&D progress of the team of the Department of Energy and Power Engineering of Tsinghua University in the field of artificial hearts. Including: an optimization method using maximum scalar shear stress (MSSS) instead of the standard hemolysis index as an optimization index is proposed to reduce the amount of calculation and improve the optimization efficiency; A blood cell damage model based on turbulent viscous shear stress (TVSS) is proposed to predict blood cell damage more accurately. In terms of artificial heart prototypes, the development of two prototypes of extracorporeal bearings and implantable magnetic-liquid mixed suspension was successfully completed and the corresponding hydraulic performance data were obtained, and the experimental data was in good agreement with the calculation results, and the error was 3.6%. In order to further promote the development of prototypes, the research team has built a comprehensive test platform for medical fluid machinery that can be used to test the physiological performance of artificial hearts. The above research results reflect the important progress made by the Department of Energetic Motion of Tsinghua University in the independent research and development technology of artificial heart.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/746

thesis

10 Influence of complex boundaries and extreme conditions on single- and multiphase turbulent flow structures and transport

WANG Dongpu,WANG Ziqi,LIU Shuang,JIANG Linfeng,YI Lei,SUN Chao

Single-phase and multiphase turbulence are widely present in nature and industrial production and are mostly affected by complex boundaries and extreme conditions The in-depth study of its physical mechanism can not only help reveal the coupling effect of turbulent structure generation and transportation efficiency with complex walls and extreme conditions, but also closely related to the flow in many dynamic systems such as atmosphere, ocean, core, aircraft engine, oil exploitation, chemical production, etc., and has important theoretical and application value. In this paper, we mainly review the research progress of our research group in recent years on turbulence under complex boundary and extreme conditions from the regulation of thermal turbulence, the effects of extreme gravity conditions and porous media conditions on turbulence structure and transport efficiency, and the particle dynamics and liquid-liquid two-phase turbulence in the turbulence field. Finally, the direction of future research work is briefly summarized and prospected.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/758

11 Multistage compressor flow and CFD integrated optimization design method

WANG Xiaochen,LI Xuesong,REN Xiaodong,WU Hong,GU Chunwei

The through-flow calculation method for S2 flow surface solution and the computational fluid dynamics CFD method for full three-dimensional viscosity solution are the main technical means for the aerodynamic design and analysis of turbomachinery. Based on a set of self-developed flow calculation programs of streamlined curvature method, an integrated flow and CFD optimization design method suitable for multi-stage high-load axial compressors is established. The method consists of an integrated pneumatic analysis method of flow and CFD and a design optimization method based on improved intelligent optimization algorithm. It is applied to a transphonic three-stage compressor to reasonably locate the problem of separation and flow of the boundary layer of transtonic moving blades. The optimization design of the first stage moving vane (R1) and the third stage moving vane (R3) was obtained, and the optimized design scheme of the three-stage compressor efficiency was improved by 0.1% and 0.3%, respectively. The results show that this method can realize the complementary advantages of the through-flow and CFD analysis methods, and grasp the aerodynamic layout design and detailed flow field structure characteristics, so as to efficiently locate the aerodynamic performance and flow field structure problems of the compressor and their association with the blade design or aerodynamic layout, and guide the optimization design direction.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/774

12 Flame dynamics and its effect on thermoacoustic stability

Wang Yichen, Zhu Min

Flame dynamics are of great significance for the accurate prediction and control of thermoacoustic oscillation in combustion systems. This paper introduces the theoretical modeling and experimental verification of flame dynamics in different application contexts in recent years, including the organization of ideal non-premixed jet flames, blunt body premixed flames, and flames on duty, as well as flame dynamics under multi-dimensional disturbances. Among them: the distributed flame transfer function of non-premixed flame is established by the Green function method; The interaction mechanism between the vortex and the flame surface was studied by the flame surface equation and the discrete vortex model. The interaction mechanism between the duty flame and the main flame was studied by the double flame surface model. Through the asymmetric flame model, the response characteristics of flames to disturbances in different directions are studied. The results show that the influence mechanism of flame dynamics on the thermoacoustic stability of the combustion chamber can be obtained by combining the flame dynamics model with the acoustic network model.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/785

13 Development trend of efficient gas turbine cooling technology and design method

REN Jing,LI Xueying,GUO Xinxin,WANG Shanyou,XU Haonan

Gas turbines and aircraft engines are known as the jewels in the crown of industry, and their development level is an important symbol of a country’s scientific and technological level and comprehensive national strength. With the continuous improvement of gas turbine and aero engine work efficiency and performance, the turbine inlet temperature rises year by year, and the turbine blades are exposed to higher incoming flow temperatures. In order for metal blades to operate safely at temperatures well above their melting point, there is an urgent need to develop efficient cooling technology. This paper summarizes the development trend of high-efficiency cooling technology and design method of gas turbine, puts forward the idea of carrying out research on gas turbine cooling technology according to three dimensions, summarizes the basic research results of the team in the aspects of cooling unit-air-cooled blade grid-multi-component interaction of the whole machine, builds an efficient and high-precision cooling structure design platform driven by experimental data, and explores the characteristics and development trend of the next generation of cooling technology represented by double wall.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/794

14 Morphology, characterization and sensitivity analysis of China’s low-carbon energy system in 2050

MA Linwei,YUAN Yuan,LI Zheng

The goal of carbon peak and carbon neutrality will accelerate the low-carbon transformation of China’s energy system. To promote concerted action across society, a clear and complete picture of the low-carbon energy system of the future is needed to provide forward-looking guidance. At present, the form, characteristics and sensitivity factors of the future low-carbon energy system are still not well studied. In this paper, a set of energy-matter flow coupling and sensitivity analysis methods is developed, the measurement basis of low-carbon energy system in 2050 is established, the relationship between its overall energy flow and carbon dioxide emission sources and sinks is described, and the impact of changes in the structure and efficiency of its main components on the total carbon dioxide emissions are analyzed. The results show that the future low-carbon energy system may present the basic forms of non-fossil energy-based primary energy structure and power generation structure and high proportion of terminal electricity, and may have basic carbon emission characteristics such as negative emissions in the power sector and the largest emission in the industrial sector. The total carbon emissions of the system are most sensitive to changes in the proportion of electricity in the industrial sector and the efficiency of fossil energy generation, followed by the increase in the proportion of wind power, carbon capture and sequestration (CCS) for more coal power installations, and waste heat utilization from fossil energy power generation. To this end, the paper recommends strictly controlling the direct use of fossil energy, accelerating the low-carbon process of the power sector, strengthening the exploration of low-carbon paths and non-fossil non-electric utilization in sectors that are difficult to reduce emissions, and vigorously building smart energy systems to ensure multi-energy complementarity.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/802

15. Optimize the carbon peak path of the urban energy system

LI Chenxi,LIU Pei,LI Zheng

In order to respond to the goals of carbon peak in 2030 and carbon neutrality in 2060, all industries and regions in China need to carry out low-carbon planning for the development of energy systems according to their own resource endowments and future development expectations. Scientific planning can reduce the cost of carbon emission reduction to a certain extent. In this paper, an energy system development planning model based on superstructure modeling method is established, which can be used for development path planning with carbon peak as the goal. The model takes the structure and main infrastructure of the regional energy system as the starting point of planning, and comprehensively considers the possibilities and mutual substitution of multiple energy supply, conversion, transmission, storage and consumption technologies at different time periods during the planning period, so as to obtain a low-carbon development technology path with the best total cost of the energy system. Taking a city above a certain size as an example, this paper plans and designs its energy system development path from 2021 to 2035, controlling the peak carbon emissions of the city to 179 million tons, and reducing carbon dioxide emissions by a total of 150 million tons in 15 years.

Identify the QR code and get access to the full text

(Please click here for the full text link.)http://jst.tsinghuajournals.com/CN/Y2022/V62/I4/810

Journal of Tsinghua University (Natural Science Edition) is in charge of the Ministry of Education and sponsored by Tsinghua University, based on Tsinghua University, open to the journal, and has been included in the international literature retrieval agencies EI, CA, MR, INSPEC, ZBL, etc. and the domestic national literature retrieval institutions Chinese core journal overview, CSCD, CNKI, etc., submission URL:http://jst.tsinghuajournals.com/CN/1000-0054/home.shtml

Special statement: This article is reproduced only for the need to disseminate information, and does not mean to represent the views of this website or confirm the authenticity of its content; If other media, websites or individuals reprint and use from this website, they must retain the “source” indicated on this website and bear their own legal responsibilities such as copyright; If the author does not wish to be reprinted or contact the reprint fee, please contact us.



Source link

Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button