Method and device for drying lignite and improving quality of lignite

Abstract

The invention discloses a device for drying lignite and improving quality of the lignite. The device comprises a device which generates a low-pressure superheated gas or steam, an air intake combined pipe and a cylindrical heater, wherein the cylindrical heater is provided with a first material propeller, a feeding pipe, a discharging pipe and one or more exhaust valves; wind closing devices are arranged on the feeding pipe and a blanking pipe, and the blanking pipe can be connected with a lignite rod shaping machine. The method for drying the lignite and improving the quality of the lignite implemented by using the device comprises the following steps: carrying out pressurization on a gas in a gas storage tank through a gas booster to more than 0.1MPa, and then heating to 105 to 400 DEG C through a heat exchanger; spraying a heated hot gas by sections into the cylindrical heater to heat the lignite, and keeping pressure in the cylindrical heater more than 0.1MPa; opening the exhaust valves when the pressure in the cylindrical heater is greater than that of the gas in the gas storage tank; discharging the heated lignite from the blanking pipe. The mechanical hardness and thermal stability of the lignite dried by the method and the device are increased. The drying process is environment-friendly, the water consumption is low and the equipment cost is low, so that the lignite is easily produced on a large scale.

Description

technical field [0001] The invention relates to the field of processing and utilization of lignite, in particular to a device and method for drying and processing lignite. Background technique [0002] As we all know, lignite has a huge amount of occurrence on the earth, but it has high water content, low unit calorific value, easy spontaneous combustion, easy pulverization, low mechanical strength and thermal stability, and is not conducive to direct transportation and utilization. Over the years, countries around the world have conducted a lot of research on reducing the moisture content of lignite, thereby increasing the unit calorific value and improving coal quality, but there is no mature technical process and there are many disadvantages. Mainly include: 1. High energy consumption, relying on a large amount of coal to evaporate a large amount of water in raw coal; 2. Environmental protection carbon emissions are large, and pollution is large; 3. The finished product i...

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Problems solved by technology

Mainly include: 1. High energy consumption, relying on a large amount of coal to evaporate a large amount of water in raw coal; 2. Environmental protection carbon emissions are large, and pollution is large; 3. The finished product is severely pulverized, and its mechanical strength and thermal stability are lower than that of raw coal. , not conducive to transportation; 4. Complex equipment, high cost, high production cost, difficult for large-scale industrial application

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