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Method of producing high quality semicoke using low grade brown coal

A lignite, high-quality technology, applied in coking ovens, petroleum industry, etc., can solve the problems of low utilization of low-quality lignite resources, achieve low production and processing costs, increase utilization rate, and increase added value

Inactive Publication Date: 2009-09-30
云南冶金集团总公司技术中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to overcome the above-mentioned shortcomings of low utilization of low-quality lignite resources, and provide a processing method for producing high-quality semi-coke from low-quality lignite with simple process flow and low production cost

Method used

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  • Method of producing high quality semicoke using low grade brown coal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The processing technology process of the present invention is as follows: the low-quality lignite of ash content 30~40%, volatile matter 40~50%, fixed carbon content 30~40%, cartridge calorific value about 19MJ / kg is raw material, adds reactor, at temperature Dry distillation at 800°C for 10 hours to obtain lignite semi-coke; at this time, the ash content of lignite semi-coke is 40-50%, volatile matter is 12%, fixed carbon is 53%, and the calorific value of the cartridge is about 18-20MJ / kg. Under the condition of specific gravity of 1.25, heavy medium washing is carried out to obtain high-quality semi-coke with 13% ash, 12% volatile matter, 83% fixed carbon content, and about 25-30MJ / kg calorific value of the cartridge, and the remaining part of low-quality semi-coke . The heavy medium is selected from the common iron heavy medium sold in the market.

Embodiment 2～5

[0012] The raw material is 4 parts of the same low-quality lignite, prepared according to the same processing technology as in Example 1. Their residence time in the reactor is 20 hours, the temperature is 700°C, 800°C, 900°C, 1000°C respectively, and the specific gravity of heavy medium separation is 1.4 to produce high-quality semi-coke. Their reaction temperature in the reactor See Table 1 for the obtained semi-coke quality data.

[0013] The results show that the semi-coke quality is the best when the reaction temperature in the reactor is 1000℃, but the yield is the highest at 800℃.

[0014] Table 1 The result table of semi-coke quality prepared under different temperature conditions in the reactor

[0015] Reaction temperature (°C)

Embodiment 6～9

[0017] The raw material is 4 parts of the same low-quality lignite, prepared according to the same processing technology as in Example 1. Under the condition that the temperature in the reactor is 1000°C, the action time is 8, 10, 12, 14, and 20 hours respectively, and the specific gravity of heavy medium separation is 1.4, high-quality semi-coke is produced. Their action time in the reactor is the same as that of The obtained semi-coke quality data are shown in Table 2.

[0018] Table 2 The result table of semi-coke quality prepared under different time conditions in the reactor

[0019] Reaction time (h)

[0020] The results show that the semi-coke quality is the best when the reaction time in the reactor is 14 hours.

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Abstract

The invention discloses a method of using low-quality lignite as a raw material to obtain lignite semi-coke through dry distillation, and then to obtain high-quality semi-coke through heavy medium washing. It is characterized in that low-quality lignite is used as raw material, put into a reaction kettle, and dry-distilled at a temperature of 800°C for 10 hours to obtain lignite semi-coke; at this time, the ash content of lignite semi-coke is 40-50%, volatile matter is 12%, and fixed carbon is 53%. , The calorific value of the cartridge is about 18-20MJ / kg, and then the heavy medium washing is carried out under the condition of the medium specific gravity of 1.25, and the ash content is 13%, the volatile matter is 12%, the fixed carbon content is 83%, and the calorific value of the cartridge is about 25-30MJ / kg of high-quality semi-coke and the remainder of low-quality semi-coke. The high-quality semi-coke produced by the method of the invention has the characteristics of high fixed carbon content, high calorific value, low ash content, etc., and can be used as coke for ferroalloy, coke for sintering iron ore powder, blast furnace injection fuel and the like.

Description

Technical field: [0001] The invention mainly relates to the technology of producing high-quality semi-coke from low-quality lignite through a reasonable processing technology, which is especially suitable for the development and utilization of low-quality lignite, and belongs to the field of coal processing applications. Background technique: [0002] Coal accounts for about 69% of my country's energy consumption structure. my country has abundant coal resources, of which lignite accounts for more than 15% of the total reserves, and low-quality lignite with high ash content, low fixed carbon, and low calorific value occupies a considerable proportion. Lignite is prone to spontaneous combustion, weathering, high moisture content, high oxygen content, low fixed carbon content, and low calorific value. Conventional lignite utilization technologies are mainly direct utilization and carbonization products after carbonization of lignite; low-quality lignite is of poor quality, The...

Claims

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Application Information

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IPC IPC(8): C10B57/14
Inventor 雷霆刘志斌张玉林张家敏冯林永
Owner 云南冶金集团总公司技术中心
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