Step-by-step modification upgrading system of brown coal

Abstract

The invention relates to a step-by-step modification upgrading system of brown coal. The step-by-step modification upgrading system comprises a drying stage, an upgrading stage and a cooling stage, wherein coal is heated to 180-300 DEG C under the condition of isolating air through a gas heat carrier so that more than 90% of all water, crystal water and partial oxygen-containing functional groups influencing the heat value of the coal are removed and heating components of the coal are enriched. According to the step-by-step modification upgrading system of the brown coal, the heat value is increased to be more than 5000 kcal / kg, the water content is lower than 8%, the index of coal for medium-high heat value power is reached, and the modified coal has the characteristics of high heat value, good stability, weak hydroscopicity and the like; due to utilizing a double zero water process, no industrial water is required, no waste water is generated, and no harmful gas is discharged; each component adopts modularized design and can be matched according to yield requirements; and the step-by-step modification upgrading system disclosed by the invention is a highly-automatically coal treating system for treating a large amount of coal.

Description

technical field [0001] The invention belongs to the technical field of internal heating type gas heat carrier lignite upgrading, and in particular relates to a step-by-step lignite modification and upgrading system. 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...

AI Technical Summary

Problems solved by technology

Disadvantages of this process: high requirements on lignite particle size and coal quality, suitable for middle-aged and old lignite; single processing capacity is small, waste water is large, serious pollution, poor environmental protection

The internal heat type solid heat carrier method, which is represented by Lurgis Rulges low-temperature dry distillation method (abbreviated as L-R method), has the disadvantages of this process: the output of semi-coke is small, the liquid product is more, the impurities are more, and the gas output is more. It is only suitable for Used for city gas; single unit has small processing capacity, large amount of waste water, serious pollution, and poor environmental protection

[0005] At present, lignite upgrading technology at home and abroad is still immature. In order to achieve large-scale production and low pollution environmental protection indicators, targeted development of lignite upgrading technology will be the research direction of comprehensive utilization of lignite resources

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