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Method for improving microwave pyrolysis rate of low-rank coal

A pyrolysis rate, low-rank coal technology, applied in the petroleum industry, coke ovens, etc., can solve the problems of technical industrialization difficulties, high cost, and increased subsequent solid product separation costs, and achieve strong scalability and energy saving , The effect of shortening the pyrolysis time

Inactive Publication Date: 2012-06-27
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of these substances as absorbents in the microwave pyrolysis process of coal is not only costly, but also increases the cost of subsequent separation of solid products, making it difficult to industrialize this type of technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 3g of semi-coke prepared from low-rank coal at a final pyrolysis temperature of 750°C and 15g of lignite, mix them uniformly, and put them into a quartz reactor in a microwave oven. The final heating temperature is 750°C, and the final temperature residence time is 30min; It only takes more than one minute for coal to reach the final microwave pyrolysis temperature of 750℃ under nitrogen atmosphere. If the ratio of semi-coke to lignite is 3 / 5, the pyrolysis time is shortened to 30 seconds and enters the final temperature incineration stage. The solid product obtained by microwave pyrolysis can also be used after being mixed with coal in proportion.

Embodiment 2

[0019] Mix 3 g of the solid product obtained by microwave pyrolysis of the low-rank coal in Example 1 and 15 g of lignite uniformly and put them into a quartz reactor in a microwave oven cavity. The final heating temperature is 750° C., and the final temperature residence time is 30 min. It only takes one and a half minutes for coal to reach the final microwave pyrolysis temperature of 750°C under a nitrogen atmosphere. If the ratio of the microwave pyrolysis solid product to the lignite is 2 / 5, the pyrolysis time is shortened to 45 seconds and enters the final temperature incineration stage. The obtained solid product can also be used after being mixed with coal in proportion.

Embodiment 3

[0021] Take 3g of semi-coke prepared from low-rank coal under the condition of final pyrolysis temperature of 650℃ and 15g of long flame coal, mix them uniformly, and put them into the quartz reactor of microwave oven. The final heating temperature is 650℃, and the final temperature stays. The time is 30 minutes; it only takes two minutes for the coal to reach the final microwave pyrolysis temperature of 650°C under a nitrogen atmosphere. If the ratio of semi-coke to long flame coal is 3 / 5, the pyrolysis time will be shortened to one minute, and it will enter the final temperature incineration stage. The solid product obtained by microwave pyrolysis can also be used after being mixed with coal in proportion.

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Abstract

The invention relates to a method for improving microwave pyrolysis rate of low-rank coal. The method is characterized by comprising the following steps of: uniformly mixing semi-coke as a microwave absorbent with the low-rank coal according to the mixture ratio of 1 / 5, 2 / 5 or 3 / 5, then adding into a pyrolysis container, and then placing into a microwave reactor for performing microwave pyrolysis to get a solid product, wherein the heating final temperature is 650 DEG C-750 DEG C and the retention time of the final temperature is 20-40 minutes; and introducing nitrogen as protective gas during the pyrolysis process, wherein the semi-coke as the microwave absorbent is constituted by the solid product which is prepared from the low-rank coal under the condition that the pyrolysis final temperature is 650 DEG C-750 DEG C. The solid product (the semi-coke) which is obtained after performing the microwave pyrolysis on the low-rank coal can be recycled as the microwave absorbent, and the temperature increase rate of the coal in a microwave field can be also improved. The semi-coke as the microwave absorbent in the method provided by the invention is the solid product of the pyrolysis process, so that the problem that the product is separated from the microwave absorbent is avoided.

Description

technical field [0001] The invention belongs to the technical field of coal pyrolysis, and relates to a method for increasing the microwave pyrolysis rate of low-rank coal. The method can be applied to produce semi-coke, tar and pyrolysis gas by microwave pyrolysis of low-rank coal. Background technique [0002] Under the situation of increasingly tense global energy resources, the economic value of low-rank coal and its related processing technology are increasingly valued by the world's energy circles. In my country's coal reserves, low-rank coal accounts for a large proportion, but its direct combustion thermal efficiency is low, greenhouse gas emissions are large, it is easy to weather and spontaneous combustion (such as lignite), and the transportation cost per unit of energy is high, which is not conducive to long-distance transportation and storage. Therefore, the upgrading and utilization of low-rank coal has been put on the agenda by coal enterprises. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/00
Inventor 刘全润夏浩马名杰潘结南刘松
Owner HENAN POLYTECHNIC UNIV
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