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Development and application of ferromagnetic heating fillers Liang Taian1, Tian Guilin1, Liu Wenqi2, Jiang Dong2, Luo Hua3 (1. Tianjin University, Tianjin 300072; 2. Tianjin Sanyuan Electric Power Company, Tianjin 300010; 3. Tianjin Xinmei Real Estate Co., Ltd., in Tianjin, converts electrical energy into heat energy quickly and efficiently, and at the same time, heating the liquid in the container or pipeline can not only be used in industrial fields to heat liquids in chemical containers and petrochemical pipelines, but also Widely used in household electromagnetic water heaters and electromagnetic heaters, the use of fast, safe, and thrifty in the chemical separation process, the packed tower is an important gas-liquid mass transfer equipment, the filler is the core component of the packed tower with heat transfer , mass transfer function, it can provide gas-liquid two-phase heat transfer and mass transfer contact surface, is widely used in refining, petrochemical, fine chemicals, food, pharmaceutical air separation and environmental protection, distillation, absorption, extraction, Washing and heat transfer operations. After more than two years of research and exploration, we will use packing and packed tower technology and materials to study electromagnetics and thermodynamics.
Unlike the common chemical fillers, ferromagnetic heating fillers have special electromagnetic induction heating functions and good heat transfer functions. They can convert electric energy into heat energy quickly and efficiently under electromagnetic induction conditions, and at the same time, the container or pipeline The liquid heating in the filler can be used not only in industrial fields for heating liquids in chemical containers and petrochemical oil pipelines, but also widely used in electromagnetic water heaters and electromagnetic heaters in household appliances, and is convenient, fast, safe, and convenient to use. The advent of electric ferromagnetic heating fillers will open up new areas of research and application of fillers. 1 The principle of heat generation Ferromagnetic heating fillers are the key components of electromagnetic induction liquid heaters. Electromagnetic induction liquid heater uses advanced electromagnetic induction principle, which consists of high frequency power supply and high frequency heater. See high frequency power supply to convert 220V, 50Hz input current into 20kHz high frequency alternating current high frequency. The heater is a cylindrical container made of a non-metallic material, and a metal coil is wound around the outer wall thereof, and a 20 kHz high-frequency alternating current high-frequency heater provided by a high-frequency power source is provided at the lower end of the cylindrical container as a liquid inlet. The upper end is a liquid outlet, and the container is filled with a heated liquid in which a ferromagnetic heating filler is placed.
When a high-frequency alternating current passes through a metal coil, an alternating magnetic field is generated around the coil, and the electrical energy is converted into magnetic energy. At the same time, the magnetic field lines of the alternating magnetic field pass through the ferromagnetic heating filler, thereby generating an induced current current in the ferromagnetic heating filler, so that the magnetic energy is converted into the induced electrical energy, and then the induced eddy current generates the Joule through the resistance of the ferromagnetic heating filler. Heat, eventually transforming the inductive electrical energy converted from magnetic energy into thermal energy. The whole process of converting electrical energy into magnetic energy and converting it into inductive electrical energy, inductive electrical energy and finally transforming into thermal energy is an electromagnetic induction liquid heater structure that is completed in an instant. In the process, the external power supply does not directly pass through the heating element, the ferromagnetic heating filler itself, which fundamentally eliminates the hidden danger that the electric heating device may leak during use. Electromagnetic induction liquid heaters use the principle of electromagnetic induction and have the significant advantage of ensuring safe use.
Electromagnetic induction liquid heaters have high conversion efficiency of electrothermal energy. They have been tested by Tianjin Institute of Metrology and Technology, and their electrothermal energy conversion efficiency exceeds 9%. The performance of electromagnetic induction liquid heaters is significantly better than that of common electric cups. The household water heaters such as kettles, electric hot water bottles and electric water heaters are further analyzed. The energy consumption of the high-frequency power supply of the electromagnetic induction liquid heater is about (%, the heat dissipation energy of the heater part is about 2%, therefore, the electric energy of the ferromagnetic heating filler The conversion efficiency is higher than 98%. The electromagnetic induction liquid heater using ferromagnetic heating filler is a new type of liquid heating device with high efficiency, energy saving and pollution-free environment.
2Structural characteristics Under the condition of high-frequency electromagnetic induction, in order to enable the ferromagnetic heating filler to convert electric energy into heat energy more efficiently, the filler must have the following characteristics: 1 The filler material must be a special alloy steel with strong ferromagnetism, and its iron The stronger the magnetic properties, the higher the conversion efficiency of electrothermal energy in use. 2 The filler material must also have strong corrosion resistance, and it can provide excellent heat transfer performance of the ruthenium 3 filler in the heated liquid of various compositions and temperatures. 4 The shape of the packing structure can ensure that the pressure drop in the inlet and outlet pipes is small, and the flux is large, so that the liquid flow is smooth. 5 The surface of the packing is no longer processed with small holes and small grooves and various pits and pits. It is prevented as far as possible due to magnetic flux leakage and eddy current cessation, which ultimately affects the technical parameters of the ferromagnetic heating filler. It should be matched with the technical parameters of the high-frequency power supply. 3.2 Electromagnetic induction liquid heater 50kW, power supply is single-phase 220V*11V, three 19V, power frequency 50Hz, working frequency (adjustable) (2 spit 5) kHz, power factor is not less than 0.98, the electrothermal efficiency is not less than 90%, and the maximum temperature of the liquid outlet is not lower than 4. Performance Introduction The use of ferromagnetic heating filler and electromagnetic induction liquid heater has the following significant advantages compared with the use of gas water heaters and electric water heaters. It is safe and reliable. Because the current only passes through the induction coil on the outer wall of the heater barrel, and does not pass through the ferromagnetic heating filler in the barrel, the liquid flowing through the barrel is absolutely uncharged, ensuring the user's Personal safety is more energy efficient and energy efficient than common gas water heaters and electric water heaters. The total efficiency of electrothermal energy conversion of electromagnetic induction liquid heater is above 90*, wherein the electrothermal energy conversion efficiency of ferromagnetic heating filler is higher than 98%, easy to use, easy to operate, and fully automatic control.
When used in the home unit room for heating, each unit can be independently adjusted and closed at any time, and the life is more comfortable. The electromagnetic induction liquid heater is used for heating, which is more than 30% more expensive than heating with a coal-fired boiler.
Since the tap water contains various trace impurities, the general water heaters are highly prone to scale, and the high frequency oscillation generated by the electromagnetic induction liquid heater can eliminate scale in the container at any time.
The device is small in size and occupies a small area, which can greatly reduce equipment investment costs. Compared with heating with coal-fired boilers, it is not necessary to build a boiler room, and it is not necessary to add boilers and large pipes. One-time investment is at least reduced by electricity, clean, no pollution, no waste, and is conducive to environmental protection. 5 Application prospects Ferromagnetic heating fillers and electricity The magnetic induction liquid heater has been successfully developed in 1999, and all of them have obtained national patents. The patent number is the thermal energy i. Seven: Experimental study on the energy dissipation characteristics of ChinaAcademic hydrocyclone Li Zili (Department of Storage and Transportation Engineering, University of Petroleum, Dongying, Shandong) 257062) For aperture and inlet flow rates, as long as the split ratio is controlled at O25%, the energy dissipation of the cyclone maintains a constant value corresponding to the inlet flow at different inlet flow rates.
A hydrocyclone is a fluid flow structure in a hydrocyclone that converts a fluid from a one-dimensional tube flow to a three-dimensional rotary flow, thereby separating, classifying, or sorting materials in a centrifugal force field. Therefore, Energy dissipation is different from general fluid flow loss and has its own complexity and particularity.
The internal energy dissipation of the hydrocyclone can be expressed in the form of internal pressure loss. Therefore, if the pressure distribution inside the cyclone can be accurately expressed, the pressure loss can be easily determined. However, since there is no suitable theoretical model so far, the description of the axial pressure drop of the cyclone can only be based on empirical data obtained from experiments, and the pressure distribution of a particular cyclone with its specific flow field characteristic parameters. Calculation of losses and losses When the flow or structural parameters of the cyclone change, the flow field characteristic parameters will change accordingly, causing the deviation of the pressure drop law description, and then the description of the energy dissipation is not allowed. The black box method is used for the study. Avoid complex flow field problems, determine the regularity of the hydrocyclone energy dissipation and operating parameters (flow split ratio) and structural parameters (relieving pore size). 1 Experimental system profile experiment using transparent plexiglass double cone spin The flowmeter has a nominal diameter D of 35 mm. For other structural dimensions, see Table 1. The swirl tube adopts two symmetrically arranged cylindrical tangential inlets. Each inlet has a diameter of 11.4 mm. The overflow hole used in the experiment is put into production. It will soon be widely used for liquid heating in chemical equipment and petrochemical pipelines, and will enter thousands of households.
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