Lignite microwave drying multi-physical-field analogue simulation method

Abstract

The invention discloses a lignite microwave drying multi-physical-field analogue simulation method. The method comprises the following steps: establishing a lignite microwave drying multi-physical field coupling model in COMSOL software, wherein the lignite microwave drying multi-physical field coupling model comprises an electromagnetic field model in a microwave oven and a coal sample, a heat and mass transfer field model in the coal sample and a seepage field model of water in the coal sample; establishing a 3D geometric model of lignite microwave drying in the COMSOL according to the microwave oven and the lignite coal sample physical structure; endowing the 3D geometric model with material attributes; setting initial conditions and boundary conditions; dividing the 3D geometric modelinto grids; and calculating to obtain distribution of an electric field and a temperature field in the lignite microwave drying process. According to the method, the dynamic distribution rule of key parameters such as an electric field, a temperature field and moisture in the lignite microwave drying process can be obtained, time and cost are saved to a great extent, and certain theoretical guidance is provided for regulation and optimization of the lignite microwave drying process.

Description

technical field [0001] The invention belongs to the technical field of lignite simulation and simulation, and in particular relates to a multi-physical field simulation method for microwave drying of lignite. Background technique [0002] China is the world's largest coal producer and consumer. Coal supplies 67.5% of China's primary energy and more than 75% of electricity. my country has abundant reserves of lignite resources, and realizing clean and efficient utilization of low-rank lignite resources has become a key research direction in China. Unfortunately, the inherent limitations of lignite, such as high moisture and oxygen content, high transportation costs, high CO2 emissions, low calorific value, and high propensity for spontaneous combustion, greatly limit their large-scale applications. Therefore, it is very important to improve the quality of lignite by increasing its energy, and dehydration is the most critical first step. Microwave drying is a very effective ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, and propose a lignite microwave drying multi-physics field simulation method, which solves the problems in the prior art that do not consider the moisture, temperature and dielectric properties of the lignite heat transfer process in the microwave drying process. Technical issues of the interplay of properties

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