Brown coal modification and upgrading method

Abstract

The invention discloses a brown coal modification and upgrading method. The method comprises the following steps of: by a gas heat carrier, firstly, heating the coal to 180-300 DEG C under the condition of isolating air; and removing more than 90% of total moisture, crystal water and partial oxygen-containing functional groups which have influence on the coal heat value, and enriching the coal heating constituents, wherein the heat value is improved to be more than 500kcal / kg, the moisture content is less than 8%, and the medium-high heat value power coal index is satisfied. The modified coal has the characteristics of high heat value, excellent stability, poor water absorption property and the like; and meanwhile, in the technology, industrial water is not needed, and generation of waste water and emission of harmful gas are avoided, so that the technology is simple, economic and convenient, and is easy to generalize widely.

Description

technical field [0001] The invention belongs to the technical field of lignite drying, and in particular relates to a lignite modification and upgrading method. Background technique [0002] Lignite is the coal with the lowest degree of coalification. It has high moisture content, up to 30%-60%; high oxygen content, up to 18-25%; low fixed carbon content, low calorific value, generally about 3000kca1 / kg; easily weathered and broken. Due to the poor quality of coal and the difficulty of economical long-distance transportation, the industrial application of lignite is mainly based on coal production areas. However, most of the main lignite production areas in my country are far away from cities and large industrial users, and its resource advantages are difficult to transform into economic advantages. [0003] There are two reasons that affect the calorific value of lignite: first, non-heating substances reduce the amount of effective calorific substances in lignite per unit ...

AI Technical Summary

Problems solved by technology

Existing technical solutions have problems such as complex equipment and process, low drying efficiency, high energy consumption, and inability to deep dry, so that it is difficult to realize large-scale lignite drying production

[0006] Currently, lignite upgrading technology at home and abroad is still immature. In this field, there is a need for a lignite upgrading method and equipment with low energy consumption, no danger, simple production and implementation, large processing capacity and low cost.

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