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Integral process and system for directly drying and pyrolyzing lignite

A lignite and pyrolysis technology, which is applied in the direction of direct heating dry distillation, petroleum industry, coke oven, etc., to achieve the effects of reduced energy consumption, easy operation, and large environmental benefits

Inactive Publication Date: 2013-05-01
NANJING UNIV OF TECH
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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 from direct drying to 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] like figure 1 As shown, the lignite direct drying and pyrolysis integrated system consists of a pyrolysis furnace 1, a high-temperature catalytic cracking furnace 2, a buffer tank 3, a micron fuel hopper 4, a blower 5, a cyclone dust collector 6, a water washing tank 7, and an activated carbon filter tank 8 and so on. The pyrolysis furnace 1 is composed of an inner furnace and an outer heating jacket. The inner furnace of the pyrolysis furnace 1 is provided with an upper top feed inlet 13, 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 ...

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 screened, 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 int...

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Abstract

The invention relates to an integral process and a system for directly drying and pyrolyzing lignite. The process comprises the steps of feeding fuel to a high-temperature catalytic cracking furnace for combustion, taking generated heat as a heat source for raw gas cracking reaction in the high-temperature catalytic cracking furnace, allowing moderate-temperature flue gas exhausted from a flue gas outlet at the upper part of the high-temperature catalytic cracking furnace to enter a heating jacket outside a pyrolyzing furnace, indirectly heating, drying and pyrolyzing a lignite raw material to generate semi-coke, raw gas and water vapor, exhausting tail flue gas, exhausting the raw gas and the unreacted water vapor from the pyrolyzing furnace, allowing the raw gas and the unreacted water vapor to enter the high-temperature catalytic cracking furnace for catalytic cracking and water vapor reforming reaction in the high-temperature catalytic cracking furnace to generate high-temperature pyrolysis gas, allowing part of high-temperature pyrolysis gas to flow back to an internal furnace pipe of the pyrolyzing furnace, and dedusting, washing, filtering and purifying the rest of high-temperature pyrolysis gas. According to the integral process and the system, drying and steam preparation links in the traditional lignite steam gasification application are removed, and the utilization efficiency of the spontaneous steam is improved.

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% to 60%), high volatile content and low ignition point, it has poor thermal stability and chemical High activity, calorific value is generally below 4000kcal / kg. High water content reduces the energy density of lignite, which brings great difficulties to the transportation and effici...

Claims

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Application Information

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Patent Type & Authority Applications(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 UNIV OF TECH