Lignite upgrading furnace

Abstract

There are various known lignite upgrading technologies targeting outward transport; and a Lurgi gasifier is a mature industrial furnace, but the Lurgi gasifier has a strict requirement on the block diameter of a charging material (25-60mm generally) and cannot process powder and easily-pulverized lignite. In order to overcome the defects of the Lurgi gasifier, the invention provides a lignite upgrading furnace. The lignite upgrading furnace consists of a distributor, a shaft furnace body, a gas fired furnace, a circulating fan, a gas mixing chamber, gas guiding grooves, gas collecting grooves, a gas inlet and outlet pipe system and an unloading machine, and is characterized in that: a plurality of gas guiding channels and gas guiding grooves are formed in the furnace body; under the action of the gas guiding channels, a plurality of W shapes are formed on the surface of the charging material; and under the action of the gas guiding grooves and clapboards therein, a gas heat carrier flows in a Z shape in multiple paths in multiple layers, and flows horizontally with the vertically descended coal in narrow coal beds to exchange heat and mass with the coal. The lignite upgrading furnace is suitable for processing the easily-pulverized lignite with small block diameter (less than or equal to 25mm). Calculation shows that: compared with the conventional furnaces, the lignite upgrading furnace has the advantages that the area facing the wind can be increased by an order of magnitude, the route of the gas heat carrier in the coal beds can be decreased by an order of magnitude, the resistance can be reduced by about two orders of magnitude, and the retention time can be shortened by 40 to 60 percent.

Description

Technical field [0001] The invention relates to an industrial furnace for improving the quality of lignite with high moisture content and low calorific value. The upgraded lignite produced is aimed at long-distance transportation. Background technique [0002] The geological reserves of lignite in the world are about 4 trillion tons, accounting for less than 40% of the global coal geological reserves. According to statistics at the end of the 20th century, my country has proven lignite reserves of 130 billion tons, accounting for about 13% of the country's total coal reserves. The reserves are huge. Moreover, the burial depth is shallow and the recoverable coal seam is thick, most of which are suitable for open-pit mining, with safe production and low mining cost. [0003] However, its calorific value is low (generally between 2700-3600Kcal / kg), high moisture (total moisture between 26-40%), the raw coal is soft, large porosity, easy to break, large specific surface area, ...

AI Technical Summary

Problems solved by technology

[0016] The common shortcomings of the above-mentioned several quality improvement technologies are: the processing capacity of a single unit is not large; the thermal efficiency is not high; the movement mechanism is required, the structure is complicated, the cost is expensive, and the accident rate is high.

It is a pity that the existing upgrading furnaces have not paid attention to these individual requirements, and lack necessary technical measures

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