Method for preparing semicoke from low-rank coal

Abstract

The invention discloses a method for preparing semi-coke from low-rank coal, and mainly solves the technical problems that the existing semi-coke prepared from the low-rank coal is poor in grindability, high in volatile component content, high in moisture content, low in fixed carbon content and exothermic value and incapable of meeting blast furnace injection. According to the technical scheme, the method for preparing the semi-coke from the low-rank coal comprises the following steps: 1) pre-crushing the low-rank coal, namely pre-crushing the low-rank coal to ensure that the coal with the particle size of less than 3mm accounts for 75-80% of the total mass of the low-rank coal; 2) carrying out hydrothermal carbonization treatment on the low-rank coal to obtain a hydrothermal carbonization solution; (3) carrying out separation treatment on the hydrothermal carbonization liquid, and carrying out solid-liquid separation on the hydrothermal carbonization liquid to separate out a solid, namely hydrothermal carbon; and 4) hydrothermal carbon drying treatment: drying the hydrothermal carbon to obtain the finished product semicoke. The method disclosed by the invention is low in production cost and low in pollutant emission in the production process, and the produced semi-coke has the characteristics of low moisture and ash content, high fixed carbon and exothermic value and good grindability.

Description

technical field [0001] The invention relates to a method for preparing semi-coke, in particular to a method for preparing semi-coke with low-rank coal, and belongs to the technical fields of low-rank coal upgrading and utilization technology, semi-coke preparation technology and coal chemical industry. Background technique [0002] In 2019, China's crude steel output exceeded 980 million tons, accounting for more than 53% of the world's output. At the same time, the iron and steel industry is also a large energy and resource consumer. The energy consumption of China's domestic iron and steel industry accounts for between 12% and 20% of China's total industrial energy consumption. It also accounts for about 70% of the total consumption of the iron and steel industry, and is the link with the largest energy consumption and carbon dioxide emissions. Therefore, the focus of energy conservation and emission reduction in the iron and steel industry lies in the ironmaking process. ...

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Problems solved by technology

[0015] The purpose of the present invention is to provide a method for preparing semi-coke from low-rank coal, which mainly solves the problem that the existing semi-coke prepared from low-rank coal has poor grindability, high moisture content, low fixed carbon content and calorific value, and cannot meet the needs of blast furnace spraying. Blowing technical issues

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