A Design of Magnetic Load Simulator for the Rotor Dropping Protection Experiment System of Helium Circulator in HTR

2014 ◽  
Author(s):  
Zhu Liang ◽  
Wang Hong
Keyword(s):  
High Temperature ◽  
Axial Load ◽  
Magnetic Bearings ◽  
Protection System ◽  
Economic Losses ◽  
Experiment System ◽  
Full Speed ◽  
High Temperature Reactor ◽  
Load Simulator ◽  
The Impact

The rotor of helium circulator in High Temperature Reactor (HTR) is supported by magnetic bearings, but the auxiliary bearings of the magnetic bearings are easy to be broken if the rotor touched down the bearings at the full speed. If the rotor touched down more than a few times, the auxiliary bearings must be changed, which will bring huge economic losses to the HTR. Therefore, we designed a rotor dropping protection system which can reduce the impact when the touching down happened and protect the auxiliary bearings from more damages. We designed an experiment system to validate the reliability of the protection system. For simulating the impact of the auxiliary bearings when the rotor dropped, a magnetic load simulator was designed, which can exert axial load to the motor directly by electromagnetic force though a similar technology to the magnetic bearings. The design axial load of the magnetic load simulator is 110kN with a clearance of 1mm. By analyzing and calculating the parameter of the magnetic load simulator, we thought it can meet the loading requirements of this test. And the design of the magnetic load simulator will open up a new way of application for the magnetic bearings.

A Design of Simulation Experiment System for the Helium Turbine

2012 ◽  
Author(s):  
Liang Zhu ◽  
Zhengang Shi
Keyword(s):  
Simulation Experiment ◽  
Cooling System ◽  
Aerodynamic Force ◽  
Magnetic Bearing ◽  
Magnetic Bearings ◽  
Radial Load ◽  
Monitoring And Control ◽  
Experiment System ◽  
Compressor Rotor ◽  
Load Simulator

In this paper a new design of simulation experiment system for the helium turbine is described. This experiment system is for to study the rotor dynamic performance of the helium turbine in a 10 MW high temperature reactor-based helium turbine (HTR-10GT) power generation project. The system is a vertical and biaxial arrangement. The motor rotor is on one axis and the turbine-compressor rotor is another axis. The two axes are connected by a gear box having a gear ratio of 1:5 and two couplers. The motor has a rate speed of 3,000rpm, and the turbine-compressor rotor 15,000 rpm. The turbine-compressor rotor, which is simulated, has a mass of 646 kg, a length of 3,568mm, and is supported by two radial magnetic bearings along with an axial magnetic bearing. The design load carrying capacity of the axial magnetic bearing is 9.8 kN with a clearance of 0.7mm and the radial magnetic bearing is 1.96 kN with a clearance of 0.6mm. For simulating the aerodynamic force and the unbalanced force on the turbine-compressor rotor when it was turning, we designed a magnetic load simulator which can exert axial and radial load to the rotor directly. The design axial load of the magnetic load simulator is 10kN and the radial load is 715N both with a clearance of 1mm. The whole simulation experiment system includes the ventilation and cooling system and monitoring and control system. It is the first time that the simulation test has been run for the vertical helium turbine with magnetic bearings, running at full speed. The turbine-compressor rotor will pass through the critical speeds for the first and second order of bending, before reaching the rated speed. The magnetic load simulator can exert load quickly and directly, and the load form can be changed online, which is a new application way for the magnetic bearing.

Magnetic Bearings for High-Temperature sCO2 Pumped Heat Energy Storage

2020 ◽  
Author(s):  
Aaron Rimpel ◽  
Natalie Smith ◽  
Tim Allison ◽  
Andrea Masala
Keyword(s):  
High Temperature ◽  
Energy Storage ◽  
Load Capacity ◽  
Sensitivity Study ◽  
Heat Energy ◽  
Magnetic Bearings ◽  
Round Trip ◽  
System Cost ◽  
Commercial Applications ◽  
The Impact

Abstract Supercritical carbon dioxide (sCO2)-based cycles have been investigated for pumped heat energy storage (PHES) with the potential for high round-trip efficiencies. For example, PHES-sCO2 cycles with hot-side temperatures of 550°C or higher could achieve round-trip efficiencies greater than 70%. The energy storage cycle and equipment also synergize well with other systems incorporating thermal storage and/or sCO2 power blocks, e.g., concentrating solar power. These sCO2 cycles are closed Brayton cycles whose efficiency and system cost and complexity are sensitive to leakage and makeup/recompression requirements for long-term application. Therefore, incorporating hermetically-sealed machinery is an attractive option for minimizing system leakage and improving system cost and performance. Bearings that enable hermetic machines include sCO2 process-lubricated bearings and magnetic bearings. Ongoing developments in sCO2-lubricated bearings are addressing the well-known limitations that have challenged their use in megawatt-scale machinery (load capacity, damping), yet magnetic bearings have decades of performance in commercial applications at that scale and are worthy of consideration. This paper discusses a proposed sCO2-based PHES system application, and a cycle model establishes nominal conditions that define CO2 environment pressures and temperatures that magnetic bearings would have to operate in. A sensitivity study of the cycle’s round-trip efficiency is presented to see the impact of improved compressor and turbine efficiencies, which would result from expected windage loss and seal leakage reduction from a hermetic machinery configuration compared to one using conventional oil-film bearings. The result is approximately two points of round-trip efficiency for each point of isentropic efficiency from all machines. In the nominal cycle, the highest process temperatures exist for the charge mode compressor and discharge mode turbine, which would require magnetic bearings capable of operating up to 410°C. This exceeds the capabilities of typical commercial magnetic bearings (200°C), though it is within temperature ranges demonstrated for high-temperature magnetic bearings operating in low-pressure air (550°C). However, high-pressure sCO2 presents unique challenges that require further development. The paper discusses how these technical issues can be addressed to advance magnetic bearings for sCO2 applications.

scholarly journals A field study to demonstrate the impact of high temperatures in Al- Diwaniya province on ISA Brown

2012 ◽  
Vol 11 (3) ◽  
pp. 35
Author(s):  
N. S. Jassim
Keyword(s):  
High Temperature ◽  
Field Study ◽  
High Temperatures ◽  
Positive Relationship ◽  
Laying Hens ◽  
Economic Losses ◽  
Morbidity Rate ◽  
June July ◽  
The Tropics ◽  
The Impact

This study aims to describe the impact of high temperatures in the tropics on layinghens ISA Brown and thus to reduce the economic losses caused by this effect.The presentstudy was conducted on two fields from the fields of laying hens have been vaccinatedaccording to a program for vaccines fixed did not get injured during the the experimentalperiod was calculated morbidity daily throughout the year.It was evident from the statisticalanalysis that for the month of significant effect on the morbidity proportion, with the highestrates morbidity in the Oval test, June, July and was the highest morbidity in July amountedto 11.04% at a temperature (30-33.8 m) and recorded less morbidity rate in January as they hit0.468 with a temperature 22.4 m. we conclude from this study that there is a correlationbetween the percentage of morbidity high temperature according to the positive relationship, also it adversely effect the production & weight of egg produced by such birds.

The Impact of the High Temperature on the Performance of Critical Components in the HTR-PM Control Rod Drive Mechanism

2013 ◽  
Author(s):  
Cheng Chen ◽  
Xingzhong Diao
Keyword(s):  
High Temperature ◽  
Permanent Magnets ◽  
Test Bench ◽  
Control Rod ◽  
Drive Mechanism ◽  
Thermal Test ◽  
High Temperature Reactor ◽  
Critical Components ◽  
High Degree ◽  
The Impact

Control rod drive mechanism is very important to the operation and safety of reactors, therefore, requiring good mechanical properties and a high degree of reliability. The control rod drive mechanism of high-temperature-reactor pebble-bedmodule (HTR-PM) is powered by permanent magnet stepping motor and damped by the permanent magnetic damper. Therefore, the performance of both motor and damper have important impact on the control rod drive mechanism. However, the performance of permanent magnets is very sensitive to high-temperature. This paper describes the impact of the high temperature on the performance of critical components in the HTR-PM control rod drive mechanism. A Full-size thermal test bench is used to determine the performance of the key components within the scope from room temperature (20 ° C) to 250 ° C, with these data we can calculate the emergency insertion time. And further work plan is introduced too.

Materials Modeling - a key for the Design of Advanced High Temperature Reactor Components

2007 ◽  
pp. 50-57
Author(s):  
Maria Samaras ◽  
Wolfgang Hoffelner ◽  
Chu Chun Fu ◽  
Michel Guttmann ◽  
Roger E. Stoller
Keyword(s):  
High Temperature ◽  
Materials Modeling ◽  
High Temperature Reactor

A NEW WELDING MATERIAL FOR REGENERATION IN THE WELDING TECHNOLOGY BASED ON NICKEL. ANALYSIS OF THE COMPOSITION AND PROPERTIES OF DEFORMABLE HEAT-RESISTANT HIGH-CHROMIUM NICKEL-BASED ALLOYS FOR WELDED PARTS. ANALYSIS OF EXISTING FUELLING STATIONS TYPES AND VEHICLES USING HYDROGEN, HYDROGEN PRODUCTION AND STORING METHODS

2019 ◽  
pp. 43-48
Author(s):  
Ben Nengjun ◽  
Zhou Pengfei ◽  
Oleksandr Labartkava ◽  
Mykhailo Samokhin
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Nickel Alloys ◽  
Total Content ◽  
Operating Conditions ◽  
High Temperature Strength ◽  
High Chromium ◽  
Salt Corrosion ◽  
Tcp Phases ◽  
The Impact

This work involves an analysis of high-chromium high-temperature deformable wieldable nickel alloys for use in GTE repair assemblies. It is shown that the alloys EP868 (VZh98) and Haynes 230 can be used in welded assemblies with an operating temperature of 800-1100 °C. The alloys Nimonic 81, Nimonic 91, IN 935, IN 939, and Nicrotan 2100 GT also have a high potential for use in welded assemblies. They are characterized by a combination of good weldability, high-temperature strength, and resistance to scaling. There have been conducted studies on high-temperature salt corrosion of model nickel alloys. They allowed establishing the patterns of the impact of base metal alloying with chromium, aluminum, titanium, cobalt, tungsten, molybdenum, niobium, tantalum and rare earth metals on the critical temperature of the start of salt corrosion Tcor and the alloy mass loss. It has been established that alloys with a moderate concentration (13-16%) of chromium can possess satisfactory hightemperature corrosion resistance (HTC resistance) under the operating conditions of ship GTE. The HTC resistance of CrAl-Ti alloys improves upon reaching the ratio Ti/Al ˃ 1. Meanwhile, the ratio Ti/Al ˂ 1 promotes the formation of corrosion products with low protective properties. The positive effect of tantalum on the HTC resistance of alloys is manifested at higher test temperatures than that of titanium, and the total content of molybdenum and tungsten in alloys is limited by the condition 8Mo2 – 2W2 = 89. The presence of refractory elements stabilizes the strengthening phase and prevents formation of the ɳ-phase. However, their excess promotes formation of the embrittling topologically close packed (TCP) phases and boundary carbides of an unfavorable morphology. Based on the studies of the HTC resistance, there has been identified a class of model high-temperature corrosionresistant nickel alloys with a moderate or high chromium content (30%), Ti/Al ˃ 1, and a balanced content of refractory and rare-earth elements.

The Impact of Plant Protection Systems on the Productivity of Soybean Varieties under Irrigated Conditions

2019 ◽  
pp. 109-117
Keyword(s):  
Plant Protection ◽  
Crop Protection ◽  
Production Costs ◽  
Protection System ◽  
Average Weight ◽  
The South ◽  
Biological Origin ◽  
Chemical Protection ◽  
Protection Systems ◽  
The Impact

The application of preparations of biological origin in the protection system of soybean grown under conditions of intensive irrigated crop rotations conforms to the modern tendencies of science and production development. The use of them contributes to solving ecological, production and social-economic problems. The study presents the three-year research on the efficiency of systems protecting soybean from pests and diseases based on biological and chemical preparations. The research was conducted in typical soil and climate conditions of the South of Ukraine. Zonal agricultural methods and generally accepted research methodology were used. The purpose of the research was to create a soybean protection system based on preparations of biological origin, ensuring high productivity of high-quality products reducing a negative impact of the crop production on the environment. The study emphasizes that, under irrigated conditions of the South of Ukraine, the application of biological preparations has a positive impact on the indexes of growth, development and formation of the elements of soybean yield structure. There was an increase in the crop biological weight by 13.8 % and 22.1 % and the number of seeds per plant rose by 11.6 and 14.6 % as a consequence of eliminating harmful organisms with the plant protection systems. The larger ground mass was formed by medium-ripe varieties Danai and Svyatogor, on which the increase from protection measures was higher. Weight 1000 pcs. the seeds did not undergo significant changes. It is established that the larger seeds were formed by Danaya and Svyatogor varieties, in which the average weight is 1000 pcs. seeds were 142 and 136 g, respectively, while in the variety Diona this figure was 133 g. There was an increase in the height of the lowest pod when the total plant height rose. For medium-ripe varieties was characterized by a higher attachment of beans, where the highest values of this indicator acquired in the variety Svyatogor. The medium maturing soybean variety Danaia formed the maximum yield of 3.23 and 3.35 t/ha respectively, when biological and chemical protection systems were applied. The research establishes that the application of the bio-fungicide Psevdobakterin 2 (2.0 l/ha) in the crop protection system at the beginning of soybean flowering and the bio-fungicide Baktofit (2.5 l/ha) with the bio-insecticide Lepidotsid-BTU (10.0 l/ha) at the beginning of pod formation does not reduce the productivity of the soybean varieties under study considerably, when compared to the application of chemical preparations. The research determines that the soybean protection system under study ensures a decrease in the coefficient of soybean water uptake by 7.2-13.0 %, increasing the total water intake to an inconsiderable degree. Biologization of the soybean crop protection system leads to a reduction in production costs compared to the chemical protection system. Taking into account the needs for the collection of additional products, costs increase by an average of 1 thousand UAH/ha, while for chemical protection systems by 1.8 thousand UAH/ha. At the same time, the cost is reduced by 220-360 UAH/t and the profitability of growing crops is increased by 3.8-7.8 %. There has been a reduction in the burden of pesticides on the environment and the production of cleaner products. This indicates the prospect of using the biofungicides Pseudobacterin 2 and Bactophyte and the bioinsecticide Lepidocid-BTU on soybeans to protect plants from pests.

THE MAIN DIRECTIONS OF ECONOMIC SUPPORT OF THE REGIONAL SECURITY SYSTEM OF THE POPULATION

2020 ◽  
Vol 1 (11) ◽  
pp. 133-140
Author(s):  
E. V. DMITRIEVA ◽  
Keyword(s):  
Crisis Management ◽  
Security System ◽  
Regional Security ◽  
Economic Losses ◽  
Economic Damage ◽  
Economic Activities ◽  
The Sustainable Development ◽  
Economic Support ◽  
The Impact ◽  
Crisis Situations

The article considers topical issues of economic support for the development of the regional security system of the population against various risks. The dependence of the impact of the scale of crisis situations on economic activities in the constituent entities of the Russian Federation, which become a serious barrier to the sustainable development of the regions of the country, was investigated. The increasing importance of risks of economic losses from accidents and disasters at potentially dangerous facilities as a result of the complex influence of natural, manmade and fire factors has been established. An analysis was carried out and proposals were developed to implement the key tasks of the state in the field of ensuring the protection of the population and territories of the country from disasters in order to ensure the stability of the economy. The organizational structure, division of tasks and functions between officials, crisis management structures and responding units were analyzed, taking into account the reduction in current financial costs. On the basis of a study of the peculiarities of the regions of the country, recommendations were formed to fulfill the necessary tasks by the anti-crisis management bodies in the field of reducing economic damage on the basis of preventing crisis situations and ensuring fire safety. It is proposed to organize the practical application of a complex automated security system based on modern developments with the application of improving the qualities and efficiency of anti-crisis management processes in order to increase economic efficiency. Initial data were formed to reduce potential threats of a natural, man-made, fire and other nature in the regions using financial and economic mechanisms. It is proposed to implement a set of priority measures to further improve and increase the potential of economic support for the anti-crisis management system. The materials of the article can be used in planning the main directions of the development of the regional population security system and the implementation of socio-economic development programs.

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