Low-temperature destructive distillation pyrolysis method of lignite

A low-temperature, lignite technology, applied in the field of dry distillation and pyrolysis of coal, can solve the problems of low utilization rate of lignite resources and high pollutant discharge, and achieve the effects of avoiding waste, reducing environmental pollution and saving costs.

Active Publication Date: 2015-01-07
SHAANXI METALLURGICAL DESIGN & RES INST CO LTD
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Problems solved by technology

[0005] The purpose of the invention is to overcome the problems of low utilization rate of lignite resources and many pollutant discharges in the prior art

Method used

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  • Low-temperature destructive distillation pyrolysis method of lignite
  • Low-temperature destructive distillation pyrolysis method of lignite

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Embodiment 1

[0029] In order to overcome the problems of low resource utilization rate of lignite and high pollutant discharge in the prior art, this embodiment provides a method such as figure 1 and figure 2 The shown lignite low-temperature dry distillation pyrolysis method comprises the following steps:

[0030] 1) crushing and screening the lignite transported from the coal mine, and selecting the undersize whose particle size is below 150 mm;

[0031] 2) Send the undersize into the vertical drying furnace 1 and directly dry it with low-temperature flue gas below 250 degrees, contact it in reverse with the lignite, and dry the undersize in the vertical drying furnace for 3 hours to remove part of the moisture;

[0032] 3) Concentrating the undersize from which part of the moisture has been removed into the discharge hopper at the bottom of the vertical drying furnace 1, and then sieving it, and selecting the undersize with a particle size of 30 to 150 mm as the low-temperature dry di...

Embodiment 2

[0042]On the basis of Example 1, the undersieve in the step 2) is sent into the upper hopper of the vertical drying furnace 1 by a belt conveyor, and is distributed in the vertical drying furnace 1 through a distributor and baked by a flow interceptor , diversion exhaust steam turning over material; said step 2) in the process of natural settlement from top to bottom of the vertical drying furnace 1, the under-sieve sinks through the curve of the multi-stage tower component, and the material is in the vertical drying furnace. The drying furnace 1 is continuously and slowly turned and turned back, and the heated contact surface is changed, and finally the moisture content of the undersize material that has removed part of the moisture in the vertical drying furnace 1 is ≤ 20%.

[0043] In the step 2), the heat required for the dehydration of the undersize material is supplied by the hot blast stove arranged at the bottom of the vertical drying furnace 1, and the hot air flow is ...

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Abstract

The invention belongs to the technical field of destructive distillation pyrolysis of coal, and particularly provides a low-temperature destructive distillation pyrolysis method of lignite. By using an improved internally heated retort oven, the method comprises the steps that the lignite material with the grain size of 30-150mm is used as the low-temperature carbonization material, so that the lignite moves down successively in the internally heated retort oven from a drying segment, a destructive distillation segment and a cooling segment; besides, heat is provided by using high-temperature waste gas from coal gas combustion for countercurrent contact and heat transfer destructive distillation to obtain lignite semicoke and raw gas containing coal tar; the cooled lignite semicoke is discharged out of the oven through a dumping device, the raw gas containing coal tar rises through materials, the materials are preliminarily preheated and dried in the drying segment by the heat of the raw gas containing coal tar, and the raw gas containing coal tar is discharged out of the oven, and is further washed, cooled and treated to obtain the coal tar and gas, and the gas is returned to the vertical-type drying furnace and internally heated destructive distillation oven for drying and destructively distilling materials. The method has the advantages that the lignite material is sufficiently utilized, the generated gas is recycled, resources are saved, and reasonable application of lignite is achieved.

Description

technical field [0001] The invention belongs to the technical field of dry distillation and pyrolysis of coal, and in particular relates to a method for low-temperature dry distillation and pyrolysis of lignite. Background technique [0002] my country is rich in lignite resources. According to statistics at the end of the 20th century, the country has proven lignite reserves of 130 billion tons, accounting for about 13% of the country's coal reserves. According to the results of the third national coal resource forecast, there is another 190.3 billion tons of predicted lignite resources, accounting for 41.18% of the national predicted coal resources. Due to the disadvantages of low coalification degree, high moisture content, and easy weathering and spontaneous combustion, lignite is not suitable for long-distance transportation, and has not been used in a large-scale scientific manner. At present, 90% of these coals are directly burned as steam coal. This kind of extensiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10B57/14C10B49/04
CPCC10B49/04C10B53/04C10B57/14
Inventor 赵杰史剑鹏薛选平陈晓菲高武军
Owner SHAANXI METALLURGICAL DESIGN & RES INST CO LTD
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