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Heating energy performance and part load ratio characteristics of boiler staging in an office building

Frontiers in Energy 2019年第2期13卷 339-353页

作者： Da Young LEE Byeong Mo SEO Yeo Beom YOON Sung Hyup HONG Jong Min CHOI Kwang Ho LEE Graduate School Hanbat National UniversityDaejeon 305-719South Korea College of Design North Carolina State University RaleighNC 27695-7701USA Department of Mechanical Engineering Hanbat National UniversityDaejeon 305-719South Korea Department of Architectural Engineering Hanbat National UniversityDaejeon 305-719South Korea

Commercial buildings account for significant portions of the total building energy in South Korea and thus a variety of research on the boiler operation related to heating energy in office buildings has been carried out thus far. However, most of the researches have been conducted on the boiler itself, i.e., the part load ratio characteristics and the corresponding gas energy consumption patterns are not analyzed in the existing studies. In this study, the part load ratio and the operating characteristics of gas boiler have been analyzed within an office building equipped with the conventional variable air volume system. In addition, the gas consumption among different boiler staging schemes has been comparatively analyzed. As a result, significant portions of total operating hours, heating load and energy consumption has been found to be in a part load ratio range of 0 through 40% and thus energy consumption is significantly affected by boiler efficiency at low part load conditions. This suggests that boiler operation at the part load is an important factor in commercial buildings. In addition, utilizing sequential boiler staging scheme can save a gas usage of about 7%. For annual heating energy saving, applying the sequential control boiler with a 3:7 proportion staging is considered to be the optimal control algorithm for maximum efficiency of boilers.

关键词： EnergyPlus boiler part load ratio gas con-sumption office building boiler staging

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Interaction of ions in water system containing copper-zinc alloy for boiler energy saving

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Rare Metals 2006年第Z1期25卷 405-410页

作者： MING Xing LIANG Jinsheng OU Xiuqin TANG Qingguo DING Yan Institute of Power Source and Ecomaterials Science Hebei University of TechnologyTianjin 300130China

Copper-zinc alloy element for boiler energy saving was put in the intake of simulated boiler system to investigate the interaction and transfer of ions in water system both theoretically and *** fouling was analyzed by scanning electron microscopy(SEM)and energy dispersive X-ray detector(EDX).The results show that the transfer of calcium and magnesium ions in heat-transfer-surface-water system is affected by zinc ions dissolved from the alloy because of primary battery *** calcium ions of calcium carbonate crystal are replaced by zinc ions,the growth of aragonite crystal nucleus is retarded,and the transition of calcium carbonate from aragonite to calcite is hampered.

关键词： copper-zinc alloy calcium carbonate fouling energy saving boiler water treatment interaction of ions

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Development of a supercritical and an ultra-supercritical circulating fluidized bed boiler

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Frontiers in Energy 2019年第1期13卷 114-119页

作者： Junfu LYU Hairui YANG Wen LING Li NIE Guangxi YUE Ruixin LI Ying CHEN Shilong WANG Tsinghua University Beijing 100084China Shenhua Group.Beijing 100031 China Dongfang boiler Works Group Zigong 643001China

The supercritical circulating fluidized bed(CFB)boiler,which combines the advantages of CFB combustion with low cost emission control and supercritical steam cycle with high efficiency of coal energy,is believed to be the future of CFB combustion *** is also of greatest importance for low rank coal utilization in *** from the supercritical pulverized coal boiler that has been developed more than 50 years,the supercritical CFB boiler is still a new one which requires further *** any precedentor engineering reference,Chinese researchers have con ducted fundamental research,development,design of the supercritical CFB boilers *** design theory and key technology for supercritical CFB boiler were *** components and novel structures were *** first 600 MWe supercritical CFB boiler and its auxiliaries were successfully developed and demonstrated in Baima Power Plant,Shenhua Group as well as the simulator,control technology,installation technology,commissioning technology,system integration and operation *** with the 460 MWe supercritical CFB in Poland,developed in the same period and the only other supercritical one of commercial running in the word beside Baima,the 600 MWe one in Baima has a better ***,supercritical CFB boilers of 350 MWe have been developed and widely commercialized in *** this paper,the updated progress of 660 MWe ultra-supercritical CFB boilers under development is introduced.

关键词： supercritical circulating fluidized bed boiler development demonstration

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Effect of Rare Earth Composite Ceramic Materials on Oil Combustion of Oil-Burning boiler

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Journal of Rare Earths 2006年第Z2期24卷 244-247页

作者：李奋平梁金生朱东彬丁燕王丽娟梁广川王亚楠 Institute of Power Source & Ecomaterials Science Hebei University of Technology

The rare earth composite ceramic materials were prepared using rare earths and far infrared natural mineral. The effects of the as-prepared ceramic materials on the oil consumption and air pollutants emissions of oil-burning boiler were investigated. The results show that the composite ceramic materials can radiate higher intensity of far infrared. The molecular movement is strengthened and the chemical bonds of the molecules are easily ruptured when the diesel oil is dealt with the composite materials. The oil-saving rate of the RBS·VH-1 .5 boiler dealt with the rare earth composite ceramic materials is 3.49%, and the reducing rates of CO and NO in the exhaust gas are 25.4% and 9.7%, respectively.

关键词： far infrared composite materials diesel oil combustion boiler oil consumption rare earths

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Surface free energy of copper-zinc alloy for energy-saving of boiler

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Rare Metals 2006年第Z1期25卷 324-327页

作者： WANG Man LIANG Jinsheng TANG Qingguo MING Xing MENG Junping DING Yan Institute of Power Source&Ecomaterials Science Hebei University of TechnologyTianjin 300130China

Cu-Zn,Cu-Zn-Sn,Cu-Zn-Ni alloys were melted by vacuum *** effect factors to the surface free energy of the alloys such as chemical composition,crystal structure and surface crystal lattice distortion *** investigated by OCA30 automatic contact angle test instrument,metallography microscope and XRD instrument *** suggests:adding alloy element to Cu may increase its surface free energy,and the more kinds of alloy elements are added,the more surface free energy increases;the alloy element Sn an increase the surface free energy of Cu-Zn alloy;Cu-Zn alloy with fir-tree crystal structure,great phase discrepancy and obvious composition aliquation has greater surface free energy;Cu-Zn alloy with compounds and serious surface crystal lattice distortion has greater surface free energy.

关键词： boiler water treatment Cu-Zn alloy crystal structure contact angle surface free energy energy-saving

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Multi-boiler System Optimization in Integrated Steelworks Based on Decomposition and Coordination Method

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Journal of Iron and Steel Research(International) 2015年第3期22卷 226-231页

作者： Guang-yu MA Wen-qiang SUN Wei-dong LI Zhu YE Jiu-ju CAI Institute of Thermal and Environmental Engineering Northeastern University Ansteel Research Institute of Iron and Steel Anshan Iron and Steel Group Corporation

As for the existing problems of boilers in integrated steelworks, the multi-boiler system could be quantitatively optimized with the decomposition and coordination method. Then, case studies were carried out based on the data of an integrated steelworks. Two groups of actual production records were contrastively analyzed, and the calculation results from the optimized program of these two groups indicated that for groups 1 and 2, the costs fall by 5.06% and 3.79%and the fuel consumptions decrease by 2.72% and 1.45%, respectively, compared with the actual data. To analyze the cost and fuel consumption change under the same condition of total load demand, assigned fuel consumption and water temperature, five sets of data were selected for further analysis. It was shown that the total cost and fuel consumption of the optimized program could fall by 3.5% and 1.6% respectively, compared with the actual production records. The optimal allocation significantly contributed to energy conservation and cost reduction. The effects of the system energy conservation cannot be realized by single equipment energy conservation. They were complementary to each other, and should be put on the same stage.

关键词： boiler self-owned power plant integrated steelworks decomposition and coordination method

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Computational Study on Furnace Process in a Multi-burner boiler of Pulverized Coal Fired Tangentially at Four Corners

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Journal of Central South University 2000年第3期12卷 152-155页

作者： Zhou, P Mei, C Cong, GC Cent S Univ Technol Dept Appl Phys & Heat Engn Changsha 410083 Peoples R China

Aiming at the optimization of the operation condition, a general numerical method for calculating pulverized coal combustion in a full scale furnace fired tangentially at four corners is adopted. “ k ε ” turbulence model is used for the gas phases and a stochastic approach based on the Lagrangian technique is used for particle phases. Two competing reactions model for the coal devolatilization and PDF (the probability density function) method for the combustion of the gas phases are employed. In the numerical simulations, assuming the air distribution of second port level is of pagoda, waist drum and uniform type. The results show that pagoda type air distribution is advantageous to ignition and smooth combustion of pulverized coal, and suitable to inferior coal combustion in practice. In the present furnace, the igniting distance at 1st and 3rd corner is longer than that at 2nd and 4th corner. The results from numerical calculations are in good agreement with those of observed in practice.

关键词： power station boiler combustion of pulverized coal numerical simulation

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A Simple Approach to Determine Noise Frequency of boiler Drum Level

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Journal of Shanghai Jiaotong university(Science) 2006年第1期11卷 66-70页

作者：余南华苏明 Key Lab.of Power Machinery and Eng.of MOE Shanghai Jiaotong Univ.Shanghai 200030 China

This paper proposed a simple approach to determine noise frequency of boiler drum level in order to improve control performance. Based on analysis of uncertainty of drum level, the redundant oscillation component of signal, noise is ascribed to the surface wave of drum water. According to the characteristic of surface wave, a new method was proposed to determine noise’s frequency band. By gradually removing the lowest frequency component of signal, the variance of remained component is calculated and observed. An apparent turning point was found and the corresponding critical frequcncy was determined. With this result a low-pass filter was designed to separate noise component. Finally validation is conducted by comparing the proposed method and conventional ones. Results show the accuracy and simpleness of the proposed method.

关键词： boiler drum level noise cutoff frequency low-pass filter

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The boiler Tube Wall Thickness Quantitative Evaluation Fusing the Magnetic and Ultrasonic Technique

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武汉理工大学学报 2006年第S3期28卷 800-804页

作者： SONG Xiaochun~(1,2) HUANG Songling~2 ZHAO Daxing~1 (1.School of Mechanical Engineering,Hubei University of Technology,Wuhan 430068,China, 2.State Key Lab ef Power Systems,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China) School of Mechanical Engineering Hubei University of TechnologyWuhan 430068China State Key Lab of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Key Lab of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China School of Mechanical Engineering Hubei University of TechnologyWuhan 430068China

Wall thickness is always a key index for boiler tube inspection in power plant,in order to improve the inspection efficiency and accuracy,a new method fusing the magnetic and ultrasonic technique was *** magnetic technique was used to do full inspection and locate the flaws,and the ultrasonic was employed to implement further quantitative inspection accu- *** comparing the precision of the polynomial,exponential and logarithmic function,the polynomial model was selected to fit the relations between the wall thickness and the peak value of magnetic signals,and the data measured by ultrasonic thickness meter was used to calibrate the model parameters online,the defect depth can be sized *** experimental results demon- grate that the model used in this system has better accuracy than the statistics relation model clearly,and it is also suitable for defect evaluation ***,it is unnecessary to have much more experimental data for the curve fitting technology,so it has better practicability than the other methods.

关键词： boiler tube main magnetic flux ultrasonic non-destructive testing

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The Development and Research on the Coordinate Control Strategy Between Turbine and boiler in Fossil Power Plant

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武汉理工大学学报 2006年第S1期28卷 363-366页

作者： WEI Shuangying (Management School,Wuhan University of Technology,Wuhan 430070,China) Management School Wuhan University of TechnologyWuhan 430070China

Based on the research on domestic and international automatic technical development in fossil power plant,the paper analyses the recent situation of the coordinate control system between turbine and boiler of domestic fossil Power Plant,provides the development thought of coordinate control system between turbine and boiler,and describes the application prospect in control system of fossil power plant combining with the application experience.

关键词： fossil power plant coordinate control system between turbine and boiler development and research

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