Large-scale brown coal quality-improving process and apparatus

Abstract

The invention belongs to the technical field of brown coal quality improving, and relates to a large-scale brown coal quality-improving process and a large-scale brown coal quality-improving apparatus. According to the invention, an interrelated large-scale continuous brown coal quality-improving system is composed of three modules which are a tunnel internal-heat drying module, an external-heating microwave destructive distillation module, and a powdery brown coal molding and drying module. Because of large-amount water discharging, a brown coal block large-capillary framework is collapsed, so that the brown coal is naturally broken into small blocks and powder without mechanical disruption. The small-block brown coal is subjected to destructive distillation under high-temperature hot wind external heating and microwave coupling, until the blocks turn into semi-coke; water-containing coal gas, water-containing coal tar, anhydrous gas, and anhydrous coal tar are respectively obtained by destructive distillation. With a binder of the water-containing coal tar and coal tar pitch (one or a mixture thereof), the powdery brown coal is subjected to kneading and aging; the material is processed into granules by using a vacuum extrusion granulator; and the particles are processed by using a low-temperature microwave drying device, so that high-quality brown coal particles with high strength, low moisture absorption, and high heat value are obtained. The brown coal particles can endure long-distance transportation.

Description

technical field [0001] The invention belongs to the technical field of lignite upgrading and relates to a large-scale lignite upgrading process and device. Background technique [0002] At present, my country has proven lignite reserves of more than 100 billion tons. In recent years, the state has paid more and more attention to the mining of lignite resources. According to the "Eleventh Five-Year Plan" for the development of the coal industry issued by the National Development and Reform Commission, there are 6 large-scale lignite mining areas among the 13 large-scale coal bases of 100 million tons that my country will focus on. . [0003] With the increase of lignite output and the adjustment of national energy structure, the rational and effective utilization of lignite is becoming increasingly important and prominent. Because the moisture content of lignite is as high as 20% to 40%, the calorific value is low, and the economy of long-distance transportation is poor, so ...

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Problems solved by technology

[0009] According to the data of the Second National Lignite Drying and Quality Improvement Technology and Industry Development Forum, my country’s lignite quality improvement technology is still in its infancy, and there is no mature process technology and equipment that can be industrialized

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