Brown coal low temperature carbonization method

A low-temperature, lignite technology, used in special forms of dry distillation, direct heating dry distillation, petroleum industry and other directions, can solve the problems of high lignite particle size and coal quality requirements, small semi-coke output, poor environmental protection and other problems, and achieve easy large-scale promotion and product quality. High quality and good stability

Inactive Publication Date: 2013-03-13
CHINA NAT HEAVY MACHINERY RES INSTCO
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Problems solved by technology

Disadvantages of this process: high requirements on lignite particle size and coal quality, suitable for middle-aged and old lignite; single processing capacity is small, waste water is large, serious pollution, poor environmental protection
The internal heat type solid heat carrier method, which is represented by Lurgis Rulges low-temperature dry distillation method (abbreviated as L-R method), has the disadvantages of this process: the output of semi-coke is small, there are many liquid products, there are many impuri

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  • Brown coal low temperature carbonization method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] A method for low-temperature dry distillation of lignite, comprising the following steps:

[0027] In the first step, the raw coal from the coal mine is crushed into granular coal of <60mm, which is screened and classified into two particle sizes of <5mm and 5-60mm;

[0028] In the second step, part of the pulverized coal <5mm is used as coal for hot blast stove combustion, and the rest is pressed into briquettes by extrusion molding technology;

[0029] In the third step, the extruded briquettes are mixed with 5-60mm granular coal and enter the drying section of the walking furnace, and are heated to 180-300°C by the inert flue gas from the hot blast stove <300°C to complete the heating of the coal material. Drying dehydration, deoxidation and preheating process removes more than 90% of the total water, crystal water and some oxygen-containing functional group...

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Abstract

The invention discloses a brown coal low temperature carbonization method. The method comprises the following steps of: by a gas heat carrier, firstly, heating the coal under the condition of isolating air, removing more than 90% of total moisture, crystal water and partial oxygen-containing functional groups which have influence on the coal heat value, and enriching the coal heating constituents; and further heating the coal to form solid semicoke, purifying the separated volatile constituent substance to recycle coal tar and coal gas products, recycling the afterheat of the high temperature semicoke and cooling the semicoke to collect the semicoke. The obtained semicoke has the advantages of high heat value, excellent stability and non-reabsorption and the like. The method is simple in technology, low in energy consumption, pollution-free and high in product quality, capable of realizing industrial large-scale production, and easy to generalize widely.

Description

technical field [0001] The invention belongs to the technical field of lignite dry distillation, and in particular relates to a low-temperature dry distillation method of lignite. Background technique [0002] Lignite is the coal with the lowest degree of coalification. It has high moisture content, up to 30%-60%; high oxygen content, up to 18-25%; low fixed carbon content, low calorific value, generally about 3000kca1 / kg; easily weathered and broken. Due to the poor quality of coal and the difficulty of economical long-distance transportation, the industrial application of lignite is mainly based on coal production areas. However, most of the main lignite production areas in my country are far away from cities and large industrial users, and its resource advantages are difficult to transform into economic advantages. [0003] Low-temperature dry distillation of lignite adopts coal pyrolysis processing technology to heat coal to 550°C to 600°C in the absence of air to remov...

Claims

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Application Information

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IPC IPC(8): C10B49/02C10B53/04C10B57/10
CPCY02P20/129
Inventor 姜永涛徐鸿钧赵玉良葛延王广收王有飞
Owner CHINA NAT HEAVY MACHINERY RES INSTCO
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