Heating Effect Evaluation of the Electromagnetic Induction Heating System at the High Temperature and Pressure Simulated Wellbore

Mathematical and computer simulation technology of condensate oil and gas wells stimulated by electromagnetic heating

Temperature field characterization and optimization of temperature field distribution in pipe lining process based on electromagnetic induction heating system

The low frequency transverse magnetic electric induction heating system uses high penetration of low frequency electromagnetic induction heat objects, which is new and high efficient. Due to the magnetic fluxing through objects transversely, it is different with other electromagnetic induction heating methods and this makes it applied more widely. And in this paper, we present the application of low frequency transverse magnetic electric induction heating system in the technique of the lock temperature on seamless line. With the analysis of heating efficiency, it also combines the theory of eddy current loss calculation with the verification results of finite element calculation and introduces the structure design of this system then. Keywords: low frequency electromagnetic induction, continuous welded rail, the lock temperature on seamless line, finite element

Based on the principle of electromagnetic induction, this paper proposes a new sleeve structure of electromagnetic induction heating energy storage system, which converts the electrical energy that cannot be consumed by wind power, solar power and other power grids into heat energy. The electromagnetic induction heating model of the eddy current field is established by Ansoft/Maxwell, and the magnetic induction intensity, current penetration depth and current frequency are analyzed. The three-dimensional fluid temperature field and its corresponding temperature characteristics of the system are analyzed by Ansys/Fluent. The temperature field cloud diagram of the sleeve is analyzed. It is concluded that with the increase of air thickness, the loss of the internal iron pipe increases, and the loss of the middle iron pipe decreases. The characteristic curve of the resonant circuit of the electromagnetic induction heating power supply is simulated and analyzed to determine the optimal parameters of the resonant circuit of the induction heating. A 100 kW electromagnetic energy storage system is developed, and the effectiveness and practicability of the method are verified, which can be applied to high power thermal energy storage.

A new approach for pectin extraction: Electromagnetic induction heating

Aiming at overcoming the shortcomings of the heating system of the cork drum in filter cigarette making machine, a high frequency electromagnetic induction heating system was used. The principle of high frequency electromagnetic induction heating and its application in cork drum heating were introduced.

Different heating has an important influence on the efficiency of the production casting. Electromagnetic induction heating technology is a new heating technology. Metallic materials is heated itself directly through the Eddy current effect with the high-frequency electric heating principle. Because of its concentrated heat, high power density and high thermal efficiency, it has more superiority than the current conventional electric furnace heating technology. In this paper, the electromagnetic induction heating system has been designed, and this heating method is applied to the casting production. The results show that the electromagnetic induction heating is very suitable for casting production, which can greatly shorten the production time and improve productivity.

As a promising metalwork processing technology, electromagnetic induction heating (EMIH) method has been applied in dealing with bolted flange joints in turbomachinery. In this study, a 3-D finite element model of electromagnetic induction heating system for the bolted flange joint is established, and the specific governing equations are derived based on Maxwell’s principle. The alternately-coupled magneto-thermal analysis is carried out considering temperature-dependent material properties to obtain the temperature distribution, followed with the uncoupled thermal-mechanical analysis to acquire the axial stress and deformation in EMIH process. The magnetic induction intensity mainly concentrates at the inner wall region, attenuates seriously along the radial direction, and reduces to almost zero at the outer wall. Due to the skin effect, the heat transfers radially and axially outward, indicating a diamondlike-shaped development from the center to the surrounding region. The axial stress with and without initial pretension are also discussed respectively. Then the corresponding experiments are introduced and carried out to validate the reliability of numerical simulation results. By comparing the results of the center point of inner surface and outer surface, the numerical simulation is proved reliable with a 5∼10% reasonable deviation. Further, the induction heating process has been improved through the optimization method based on pattern search algorithm. By adopting the stepped input current density optimized in the study, the optimal thermal stress tends to be constant and the final heating time reduces by 20.5% in the safe range of stress.

As the degree of difficulty in synthesizing single crystals at high pressure and temperature increases, powder X-ray diffraction becomes a primary technique for determination of crystal structure, unit cell parameters as a function of pressure and temperature, and phase transformations. The use of intense synchrotron radiation has revolutionized high-pressure and high-temperature research. Increases in X-ray intensity by several orders of magnitude have enabled researchers to study very small samples and collect diffraction data in time scale on the order of a minute. Such advances have opened new possibilities for studying materials under extreme high pressure and temperature conditions and time-dependent kinetic problems. Diamond-anvil cell and large-volume multi-anvil apparatus are the primary high-pressure tools used to simulate pressure-temperature conditions of Earth and planetary interiors and to study material properties and phase transformations at high pressure and temperature. The coupling of these techniques with synchrotron X radiation has made in situ diffraction measurements possible at simultaneous high pressure and temperature. Increasingly fast accumulation of in situ data has dramatically increased our knowledge of material behavior at high pressure and temperature. In this paper, we review high-pressure and high-temperature techniques used at synchrotron facilities. Each technique has its own advantages and disadvantages that determine its own unique capability and applications. The large-volume apparatus, capable of generating high temperatures (>2000°C) at moderate pressures ( 100 GPa) at moderate temperatures (<900°C), has been extensively used for in situ measurements of P-V-T equations of state and non-quenchable phase transitions in metals, oxides, and sulfides. We also review synchrotron powder X-ray diffraction techniques and optical arrangements used for data acquisition at high pressure and temperature. Although the energy-dispersive diffraction technique has been the …

Simulation of coil electromagnetic heating provides an effective model basis for a temperature control system. However, due to the irregularity of industrial heating molds, they cannot meet the model requirements. In this paper, based on the research of electromagnetic heating of thin plates, hypothesis research is carried out. Bony plates and cylinders in fixed positions on thin plates are defined as irregular workpieces. Taking the influence of cylinder height on temperature as the research direction, the temperature distribution on the surface of workpieces is explored, and the influence of different parameters on the simulation results is analyzed, which provides a simulation analysis method and data support for the electromagnetic heating system of irregular workpieces under this model and follow-up researchers.

Research on the heating effect evaluation of the electromagnetic induction heating system at low temperature based on the electrochemical-thermal coupling model

It is an important way to relieve environment problems by using wind, solar and other clean energy sources. The paper takes 24 kHz/100 kw electromagnetic thermal energy storage system as the research object. The system turn the clean electrical energy from the new energy power generation system into heat by electromagnetic induction heating, and the heat will be used or stored. Firstly, use Ansoft-Maxwell to get the magnetic induction intensity of the electromagnetic induction heating model in eddy current field, analyze the relation between current penetration depth and the current frequency. Then use Ansys/Fluent to analysis the fluid temperature field of the electromagnetic induction heating model and analyze the characteristics of temperature. Use temperature characteristics to do different test in order to get the best scheme. Finally, prove the validity of simulation by experiment, the research provides a theoretical basis for the development and application of electromagnetic thermal energy storage system.

All in an engineer’s life

A realistic interaction potential model approach by including temperature effects is developed to study phase transition, elastic properties and thermo-physical properties at very high pressures and temperatures. This approach is effectively able to explain the inter-atomic interaction involved at high temperature and high pressure as it includes the three-body interactions. Earlier works overlooked the three-body interactions at high temperature and pressures. Moreover, the phase-transition pressures of MgO crystal at high temperatures including the three-body interaction are computed for the first time. Elastic behavior, anisotropic factor and Debye temperature of MgO at high pressures and temperatures are also reported.

The electronic spin state of Fe 2+ in ferropericlase, (Mg 0.75 Fe 0.25) O, transitions from a high-spin (spin unpaired) to low-spin (spin paired) state within the Earth’s mid-lower mantle region. To better understand the local electronic environment of high-spin Fe 2+ ions in ferropericlase near the transition, we obtained synchrotron Mössbauer spectra (SMS) of (Mg 0.75 ,Fe 0.25 )O in externally heated and laser-heated diamond anvil cells at relevant high pressures and temperatures. Results show that the quadrupole splitting (QS) of the dominant high-spin Fe 2+ site decreases with increasing temperature at static high pressure. The QS values at constant pressure are fitted to a temperature-dependent Boltzmann distribution model, which permits estimation of the crystal-field splitting energy (Δ 3 ) between the d xy and d xz or d zy orbitals of the t 2g states in a distorted octahedral Fe 2+ site. The derived Δ 3 increases from approximately 36 meV at 1 GPa to 95 meV at 40 GPa, revealing that both high pressure and high temperature have significant effects on the 3d electronic shells of Fe 2+ in ferropericlase. The SMS spectra collected from the laser-heated diamond cells within the time window of 146 ns also indicate that QS significantly decreases at very high temperatures. A larger splitting of the energy levels at high temperatures and pressures should broaden the spin crossover in ferropericlase because the degeneracy of energy levels is partially lifted. Our results provide information on the hyperfine parameters and crystal-field splitting energy of high-spin Fe 2+ in ferropericlase at high pressures and temperatures, relevant to the electronic structure of iron in oxides in the deep lower mantle.