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High-efficiency and quick lignite pyrolysis method

A technology for lignite and pyrolysis, applied in the field of coal chemical industry, can solve the problems of application limitation, low calorific value, large moisture content of lignite, etc., and achieve the effects of improving pyrolysis efficiency, simple process and reducing environmental pollution.

Active Publication Date: 2013-04-24
QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lignite has a high water content, and its calorific value is usually below 4000kCal / kg. Due to its low calorific value, its application is greatly limited.

Method used

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  • High-efficiency and quick lignite pyrolysis method

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Effect test

Embodiment 1

[0032] Raw material is the lignite of Xiaolongtan Coal Mine in Yunnan Province, and industrial analysis data is: moisture content 35%, ash content 11% (dry basis), volatile content 49% (dry basis), present embodiment feeds intake 600kg, carries out fast through the method of the present invention Pyrolysis yields 183 kg of semi-coke, 39 kg of tar, 50 standard cubic meters of gas, and a comprehensive pyrolysis time of 20 minutes, which is 1 / 12 of the prior art pyrolysis time.

Embodiment 2

[0034] Raw material is the lignite of Xianfeng Coal Mine in Yunnan Province, and industrial analysis data is: moisture content 42%, ash content 13% (dry basis), volatile content 38% (dry basis), present embodiment feeds intake 600kg, carries out rapid heating through the method of the present invention Solution, get semi-coke 213kg, tar 32kg, coal gas 42 standard cubic meters, comprehensive pyrolysis time 24 minutes, be 1 / 10 of prior art pyrolysis time.

Embodiment 3

[0036] Raw material is the lignite of a coal mine in Zhaotong City, Yunnan Province, and the industrial analysis data is: industrial analysis is as follows: moisture content 48%, ash content 12% (dry basis), volatile content 45% (dry basis), the present embodiment feeds intake 600kg, through The method of the present invention carries out rapid pyrolysis to obtain 152 kg of semi-coke, 34 kg of tar, 40 standard cubic meters of gas, and a comprehensive pyrolysis time of 30 minutes, which is 1 / 8 of the prior art pyrolysis time.

[0037] Features of the present invention:

[0038] 1. Rationally utilize lignite resources to realize co-production of coke, gas and oil, use low-value lignite to produce high value-added oil, gas and coke, and rationally utilize the volatile matter in lignite.

[0039] 2. Effective use of flue gas waste heat to remove moisture from lignite, which solves the problem of high moisture content and difficult utilization of lignite.

[0040] 3. Make full use o...

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Abstract

The invention discloses a high-efficiency and quick lignite pyrolysis method which comprises raw material pretreatment, drying, primary dry distillation and secondary dry distillation. The method comprises the following steps of: crushing and sorting the lignite, sending the crushed and sorted lignite to a combustion bed and a drying bed respectively; raising the temperature of the lignite entering the drying bed to about 130 DEG C through heat exchange, separating the lignite to obtain lignite particles, removing dust from fume and using the dust-removed fume as combustion-supporting air or for adjusting the fume temperature of the drying bed; enabling the lignite particles to enter a primary dry distiller to exchange heat with heat carriers till the temperature is up to 500 DEG C, and then performing pyrolysis on the lignite particles, separating out solid semi cokes, entering a secondary dry distiller, separating a gaseous part to obtain coal gas and tar oil; and enabling the materials to enter the secondary dry distiller and exchange heat with the heat carrier till the temperature is up to 750 DEG C, and then further performing pyrolysis. The obtained large-particle semi cokesare semi coke products, small particles are used as fuels, and the generated gas portion enters a primary dry distillation step for treatment. The method has high efficiency, quickness and simple andconvenient process, and is suitable for the quick pyrolysis of the lignite of all types, and the pyrolysis efficiency is increased by more than 10 times. Not only the utilization rate of resources isimproved, but also the environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method for efficient and rapid pyrolysis of lignite based on solid heat carrier technology. Background technique [0002] Lignite, also known as firewood coal, is a brown-black, dull, low-quality coal between peat and bituminous coal, and is the mineral coal with the lowest degree of coalification. Lignite is mainly used as fuel in power plants, and can also be used as chemical raw materials, catalyst carriers, adsorbents, sewage purification and metal recovery. Because of its remarkable characteristics of "two highs and two lows" of low sulfur, low phosphorus, high volatile matter and high ash melting point, it is an ideal fuel for thermal power plants and fluidized beds. But at the same time, lignite has the disadvantages of high humidity, low ignition point and large carbon dioxide emissions, which is one of the important pollution sources that ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B49/22C10B53/04C10B57/10
Inventor 李桂成罗国林
Owner QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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