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Integral process and system for directly drying and pyrolyzing lignite

A technology of lignite and pyrolysis, which is applied in the direction of direct heating and dry distillation, petroleum industry, coke oven, etc. Simple process effect

Inactive Publication Date: 2014-07-02
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Previously, there was no report on the integrated utilization of lignite by direct drying and pyrolysis

Method used

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  • Integral process and system for directly drying and pyrolyzing lignite

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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, the lignite direct drying and pyrolysis integrated system consists of pyrolysis furnace 1, high-temperature catalytic cracking furnace 2, buffer tank 3, fuel hopper 4, blower 5, cyclone dust collector 6, water washing tank 7, activated carbon filter tank 8, etc. composition. The pyrolysis furnace 1 is composed of an inner furnace and an outer heating jacket, and the inner furnace of the pyrolysis furnace 1 is provided with an upper top feed inlet, an upper gas outlet 12, a bottom charcoal outlet and a lower air inlet 16, The heating jacket of the pyrolysis furnace 1 is provided with a lower flue gas inlet 11 and an upper flue gas outlet; the high temperature catalytic cracking furnace 2 is provided with a top air inlet 13, an upper flue gas outlet 10, a bottom gas outlet 14 and a lower fuel inlet 9 , the high-temperature catalytic cracking furnace 2 is equipped with a catalyst; the buffer tank 3 is provided with an upper gas inlet 15, a left ...

Embodiment 2

[0038] Taking a lignite coal in Inner Mongolia as an example, its calorific value is 3500kcal / kg, its total moisture content is 34.5%, its volatile matter content is 35%, and its ash content is 11%. After the lignite is sieved, the particle size ranges from 3mm to 20mm, and it continuously enters the pyrolysis furnace at a rate of 50kg / h. It is heated in the pyrolysis furnace 1 to remove moisture and generate low-pressure steam D; after dehydration, the lignite A is gradually heated to 800 ℃, pyrolysis produces coal semi-coke B, crude gas C (including tar) and water vapor D. The medium-temperature flue gas H (800°C) discharged after the combustion of the micron fuel G is passed into the pyrolysis furnace 1 to heat the lignite A;

[0039] Crude gas C and steam D enter the high-temperature catalytic cracking furnace 2, where catalytic cracking and steam reforming reactions occur at 1100°C. Part of the generated high-temperature cracked gas E (temperature 900°C) flows back into ...

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Abstract

The present invention involves an integrated process and system and system of direct drying and thermal disintegration. This process includes the combustion of the fuel into a high -temperature catalytic cracking furnace.The medium temperature smoke discharged from the upper flue gas export of the cracking furnace enters the heating furnace outside the thermal disintegration furnace, which indirectly heating and drying and thermal solution to the raw materials of lignite, which produces semi -coke, coarse gas and water steam, smoke gas exhaust; coarse gas and gas and gas and gas and gas and gas and gas and gas and gas and gas and gas and gas and gas and gas and gas;Unpopular water steam is discharged from the thermal dissolution furnace, entering the high -temperature catalytic furnace through the gas imports, and the reaction of catalytic cracking and the reorganization of water vapor in its interior to generate high temperature cracks.After the stove, the remaining part is used as an external gas or synthetic raw material after dust removal, washing and filtering purification.The present invention saves the drying and steam preparation links in the traditional lignal steam gasification application, which improves the efficiency of spontaneous steam.

Description

technical field [0001] The patent of the present invention relates to the integrated process and system of lignite direct drying and pyrolysis, in particular to the process and system of applying the low-pressure water vapor generated in the lignite drying process to the subsequent catalytic reforming reaction, which belongs to the technical field of clean and efficient utilization of low-quality coal . technical background [0002] my country's total coal reserves reach 600 billion tons, ranking third in the world, of which lignite accounts for about 12.7%. Lignite is a coal with a state between anthracite and peat. Due to its short coal-forming time, high moisture content (generally up to 30%-60%), high volatile content and low ignition point, it has poor thermal stability and chemical activity. High, the calorific value is generally below 4000kcal / kg. High water content reduces the energy density of lignite, which brings great difficulties to the transportation and effi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B49/02C10B57/10
Inventor 朱跃钊高豪杰陈海军廖传华付烽杜杨杨丽杨谋存
Owner NANJING TECH UNIV