Method of Microwave Pyrolysis and Utilization of Lignite

A lignite and microwave technology, used in special forms of dry distillation, petroleum industry, coke ovens, etc., can solve the problems of high temperature, low utilization rate, large energy consumption, etc., and achieve the effects of short production cycle, reduced emissions, and safe and reliable system.

Active Publication Date: 2015-10-28
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can solve the disadvantages of high temperature, high energy consumption and low utilization rate in the prior art by performing microwave pyrolysis on lignite, and has the advantages of simple process, high processing efficiency, short process, easy operation, and can improve the comprehensive efficiency of lignite. Advantages such as utilization efficiency

Method used

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  • Method of Microwave Pyrolysis and Utilization of Lignite
  • Method of Microwave Pyrolysis and Utilization of Lignite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] After pulverizing the lignite with a water content of 20% (weight percentage) into 0.5mm powder, it is transported to the dryer 2 and dried to a moisture content of 5% (weight percentage). Using microwave as a heat source, the lignite is heated to 600°C, After keeping it for 20 minutes, it is cooled to obtain a semi-coke product and a mixture of oil and gas. The oil and gas mixture is condensed by condenser 5 to separate tar products and pyrolysis gas. The composition of the pyrolysis gas was detected by gas chromatography (Shimadzu 2014C, TCD detector, Ar as carrier gas, TDX-1 packed column, oven temperature at 100°C).

[0029] The results of the pyrolysis of lignite are shown in Table 1.

Embodiment 2

[0031] After pulverizing the lignite with a moisture content of 30% into 1.5mm powder, it is transported to the dryer 2 and dried to a moisture content of 1%. Using the microwave as the heat source, the lignite is heated to 500℃, kept for 30 minutes, and then cooled to obtain semi-coke Product and oil-gas mixture. The oil and gas mixture is condensed by condenser 5 to separate tar products and pyrolysis gas. The composition of the pyrolysis gas was detected by gas chromatography (Shimadzu 2014C, TCD detector, Ar as carrier gas, TDX-1 packed column, oven temperature at 100°C).

[0032] The results of the pyrolysis of lignite are shown in Table 1.

Embodiment 3

[0034] The lignite with a moisture content of 40% is pulverized into a 2.0mm powder and transported to the dryer 2, dried to a moisture content of 10%. Using microwave as a heat source, the lignite is heated to 400°C, kept for 60 minutes, and cooled to obtain a semi-coke product And oil and gas mixture. The oil and gas mixture is condensed by condenser 5 to separate tar products and pyrolysis gas. The composition of the pyrolysis gas was detected by gas chromatography (Shimadzu 2014C, TCD detector, Ar as carrier gas, TDX-1 packed column, oven temperature at 100°C).

[0035] The results of the pyrolysis of lignite are shown in Table 1.

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Abstract

The invention discloses a method for microwave pyrolysis utilization of lignite. The method comprises the steps of (1) smashing lignite to form powdered raw materials, and conveying the raw materials into a drying device for drying to obtain dried powdered raw materials; (2) heating the dried powdered raw materials in the step (1) to 400-600 DEG C by taking microwaves as a heat source, and preserving the heat for 20-60 minutes to obtain a semi-coked product and oil gas mixture; and (3) separating out tar and pyrolysis gas from the obtained oil gas mixture through a condenser, conveying the pyrolysis gas into a combustion device for combustion to generate flue gas, and conveying the flue gas into the drying device in the step (1) to be used as a drying medium. The method has the advantages of simple technology, high processing efficiency, short flow, easiness in operation and the like and can improve the comprehensive utilization efficiency of lignite.

Description

Technical field [0001] The invention relates to a method for utilization of lignite, in particular to a method for utilization of lignite by microwave pyrolysis. Background technique [0002] Lignite, also known as firewood coal, is the mineral coal with the lowest degree of coalification. It is a brown-black, matt low-grade coal between peat and bituminous coal. It is characterized by high water, high oxygen, high volatile content and medium Ash, low fixed carbon and low calorific value, etc. Lignite has strong chemical reactivity, is easy to weather in the air, and is not easy to store and transport. [0003] my country’s proven reserves of lignite in 1995 were 130.3 billion tons, accounting for about 15% of the world’s proven reserves of coal. It is predicted that by 2015, the newly-added proven reserves will be 260 billion tons. It is planned to produce 2.15 billion tons of lignite coal nationwide in 2020, almost They are all distributed in underdeveloped industrial areas, wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/04C10B57/10
Inventor 孙予罕李晋平肖亚宁罗虎孔令照唐志永苗改尉慰奇刘斌
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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