When implementing a number of high-temperature processes with heat supply to the reaction zone (allothermic processes), it is impossible or economically inexpedient the burning of fossil fuels to achieve the required temperature level. The possibilities of these processes implementation through the use of electrothermal fluidized bed (ETFB) techniques are considered. Such processes include, for example, the production of hydrogen by the pyrolysis of hydrocarbon gases, the production of silicon carbide and other carbides, the production of artificial graphite and the thermal purification of natural graphite, the high-temperature heating of gases and gas mixtures. These processes can be carried out in the temperature range of 600–3000 °С using fine-dispersed materials or directly in the gas phase using ETFB. In a number of processes ETFB technology can be applied as a source of high temperature gas production, used either for the implementation of this technological process, or for ensuring the operation of technological or heat engineering equipment. Also considered the main structural characteristics of the equipment that ensure the implementation of processes in the ETPS. Bibl. 37.
To improve the technological features and efficiency of high-temperature processing of the dielectric materials, a reactor design with the electrothermal fluidized bed with a combined heating method was developed at the Institute of Gas of the National Academy of Sciences of Ukraine. The main purpose of this reactor is the process of applying a pyrocarbon coating to quartz sand. The principle-technological scheme of the process is given. Subsequently, quartz sand coated with pyrolytic carbon will be used to produce pure silicon carbide. The authors developed a methodology for calculating the heat balance, which allows estimating the efficiency of the reactor. A method for calculating similarity criteria was chosen for the possibility of comparing the efficiency of heat exchange in a developed reactor with other machines for thermochemical processes. A description of the heat exchange between the fluidized bed and the electrode is proposed. After further experiments, it willbe possible to make final conclusions regarding improving the technological features andincreasing the efficiency of the process of applying a pyrolytic coating to quartz sand, andalso to check the adequacy of the calculation methods. After further experiments, it will bepossible to make final conclusions about improving the technological features and increasing the efficiency of the process of applying a pyrolytic coating to quartz sand. Also, it will allow to check the adequacy of the calculation methods. Bibl. 17, Fig. 2.
The main purpose of this paper is to investigate the concept of a heat treatment of a small amount of solid material with the maximum contact of the gas and solid material. The solution of this problem consists in passing the process in a fluidized bed. However, the key issue of this solution is the problem of entrainment of solid material. Among feasible ways of the fluid bed hydrodynamics creation is a sound waves transmission through a solid granular material. A visual study on the fluid bed hydrodynamics creation with sound waves was conducted. The estimation of the impact of the trajectory of the particles on the thermophysical properties of the fluidized system was determined. The exploitation of sound waves should increase the intensity of heat exchange inside and between the solid and gas phases. Reactor design scheme for pyrocarbon coatings creation was developed. This scheme implies a small amount of material to be treated. The results obtained can be subsequently applied in the process of developing new fluidized bed apparatus, when the usage of a gas or a liquid as a fluidizing agent is technically impossible (or insufficiently). The prospects for further research include homogenization of the agglomerate layer by means of sound waves. Bibl. 9, Fig. 4.
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