Coal layer under microwave heating Analytical stud

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Coal layer under microwave heating: Analytical study under mixed boundary conditions I and II of the genus

Abstract
The relevance of the work is due to the prospect of the use of microwave radiation in the energy technologies of fuel use at the stages of preparation of solid fuels for coal-fired incineration, including drying and heat treatment. A few well-known results of laboratory experiments indicate structural effects, resulting in increased reactivity and reduction of unburnt fuel. Objective: to obtain an analytical expression for the temperature field in the coal array required for parametric analysis of technological conditions of microwave exposure. Methods: construction of analytically rigorous heat transfer problems, the solution of which is usually possible only in conditions of significant simplifications. If adopted by the constancy of the electrical and technological properties of coal physical picture of the process is determined by the incident on the coal layer of a plane electromagnetic wave that generates internal heat source of Buger law. The energy equation in the form of Fourier is solved independently of Maxwell equations. In this formulation the solution of allocated tasks is carried out by the method of integral transformation of Laplace. Results. The derived analytical solutions of temperature fields are received with mixed boundary conditions with fairly arbitrary changes in time and temperature of a surface flux density of fire on the border. For some special cases on this basis can be obtained an extensive series of simplified solutions available for parametric analysis of the rationale of optimal control parameters of the technology demanded by the engineering practice in project development and operation of microwave systems for processing of solid fuels in the energy sector.
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Coal layer under microwave heating: Analytical study under mixed boundary conditions I and II of the genus. Available from:  [accessed Jul 26, 2017].
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METHOD FOR MICROWAVE GRADIENT ACTIVATION OF COAL \\ СПОСОБ СВЧ-ГРАДИЕНТНОЙ АКТИВАЦИИ УГОЛЬНОГО ТОПЛИВА

Research · April 2015;with;1,004 Reads
DOI: 10.13140/RG.2.1.4358.6083
S. ;. Pashchenko
1st S. ;. Pashchenko
Abstract
54) METHOD FOR MICROWAVE GRADIENT ACTIVATION OF COAL (57) Abstract: FIELD: power industry. SUBSTANCE: method consists in microwave gradient activation of coal in high-gradient microwave field in velocity control mode of microwave field rise. Boundaries of coal lump are arranged in zones of zero or close-to-zero intensities of microwave field. Activation is performed till deep cracks appear in coal lump, which do not lead to its complete destruction. End of activation process stage is appearance of persistent flame of activation volatile hydrocarbons. EFFECT: quick and effective heating of coals; improving energy use efficiency for coal heating; processing of compound hydrocarbons to easier and more volatile hydrocarbons deep in coal lump prior to the combustion beginning; possibility of controlling the modes of power pumping to various forms of activated volumes of coal, which allows implementing various modes of action on coal. 2 cl, 2 ex, 2 tbl, 8 dwg (57) Реферат: Изобретение относится к технологии подготовки угольного топлива к сжиганию в энергетических котлах. Способ заключается в СВЧ-градиентной активации угольного топлива в высокоградиентном СВЧ поле в режиме управления скоростью нарастания СВЧ поля. Границы куска угля размещаются в зонах нулевых или близких к ним напряженностей СВЧ поля. Активацию проводят до возникновения в куске угля трещин глубокого разлома, не приводящих к его полному разрушению. Окончанием стадии процесса активации является возникновение незатухающего факела активационных летучих углеводородов. Технический результат - быстрый и эффективный нагрев углей; увеличение на 20-30% КПД использования энергиинанагревугля; переработка сложных углеводородов в более простые и более горючие в глубине куска угля до начала горения; возможность регулирования режимов накачки мощностей в разные формы активированных объемов угля, которая позволяет осуществлять различные режимы воздействия на уголь. 1 з.п. ф- лы, 2 пр., 2 табл., 8 ил.
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