Brown coal drying and dehydrating device

A dehydration equipment, lignite technology, applied in dryer combination, drying solid materials, lighting and heating equipment, etc., can solve the problems of increased operating costs, high costs, and high operating costs

Inactive Publication Date: 2010-06-16
CITIC GUOAN MENGGULI NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent US4567340A also mentioned a kind of electromagnetic wave lignite dehydration equipment, but the equipment has high operating cost, which is mainly manifested in high energy consumption
In addition, the microwave drying equipment for coal is also mentioned in the patent CN101326265A. First of all, this equipment is the same as the patent US4567340A. Grading and then drying treatment, which increases the process and increases the operating cost accordingly
We all know that electromagnetic waves are mainly driven by electricity, and the efficiency of electromagnetic waves from input power to output power is 75%, and 1KW output power will evaporate 1kg of water, so when lignite is completely dehydrated by electromagnetic waves, the cost is quite high and it is difficult mass production
The efficiency of microwave in removing internal water (adsorbed water) and combined water in lignite is very high, because water molecules are wave-absorbing substances, which increase their own energy by absorbing the energy of microwaves, thereby accelerating the rotation of water molecules Vibrates and emits into the air, which is difficult for conventional equipment

Method used

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  • Brown coal drying and dehydrating device
  • Brown coal drying and dehydrating device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 500g of raw coal that has been crushed, firstly pass through the pretreatment of rotary blast drying equipment at 115°C, and then use microwave treatment, the microwave frequency is 2450MHz, the output power is 700K, after 5min, the weight loss rate of coal is 32.25%, and the moisture content About 0.8%. After testing, the calorific value of this coal has increased from 3750 kcal of raw coal to 6000 kcal.

Embodiment 2

[0027] Weigh 500g of crushed raw coal, adopt the steps of Example 1, and after vibrating fluidized bed treatment at 125°C, use microwave treatment, microwave frequency is 915MHz, output power is 700K, after 5min, the coal weight loss rate is 32.85 %, the moisture content is about 0.35%. After testing, the calorific value of this coal has increased from 3750 kcal of raw coal to 6080 kcal.

Embodiment 3

[0029] Weigh 600g of crushed raw coal, adopt the steps of Example 1, heat-treat with rotary blast at 140°C, and then use microwave treatment with a microwave frequency of 915MHz and an output power of 750K. After 4min, the coal weight loss rate is 32.5%. , the moisture content is about 0.7%. After testing, the calorific value of this coal has increased from 3750 kcal of raw coal to 6045 kcal.

[0030] 3 example result data charts are attached figure 2 . In the accompanying drawings, the ordinate corresponding to the 0 point of the abscissa is the percentage of dehydration of lignite after pretreatment.

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Abstract

The invention relates to a brown coal drying and dehydrating device and an application method. The hot-air drying and dehydrating device dries and dehydrates brown coal at high speed and low energy consumption by main means of high-power microwaves and infrared. The application method for the device comprises the steps of: crushing raw coal; pretreating the coal through a hot-air drying system to remove external water; and then drying and dehydrating the coal further by microwaves, wherein an infrared scanning system is adopted in the drying and dehydrating process in order to prevent the brown coal from backwater. By applying the device, the water in the brown coal can be removed by over 98 percent in short time. The brown coal drying and dehydrating device has the advantages of simpleness and easy operation of process flow, quick dehydration and low energy consumption. The device and the method have no negative effect on the environment, the water coming out through drying can also be recycled, and the device and the method are economic and effective.

Description

Technical field: [0001] The invention belongs to the technical field of coal processing, in particular to the application technical field of processing and dehydrating lignite quickly and with low energy consumption. Background technique: [0002] my country is a country dominated by coal as a primary energy source, and has become the world's largest coal producer. According to statistics, my country's mineable reserves of coal resources rank third in the world, accounting for about 11.5% of the world's total reserves. Among them, lignite processing accounts for about 16% of the world's total lignite reserves. At present, bituminous coal and anthracite are the main mining and utilization of coal resources in our country, and the mining and utilization level of lignite is very low. With the continuous increase of my country's demand for energy and the excessive exploitation of bituminous coal and anthracite resources, the development and utilization of lignite will become m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B20/00F26B3/02F26B3/347F26B3/30F26B23/08F26B25/22
Inventor 其鲁张敬华漠楠吴宁宁侯建斌
Owner CITIC GUOAN MENGGULI NEW ENERGY TECH
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