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Lignite low-temperature carbonization and upgrading combined system and method

A lignite and low-temperature technology, which is applied in special forms of dry distillation, petroleum industry, coke oven, etc., can solve the problems of waste of resources, high energy consumption and low efficiency of lignite drying process, and achieve energy saving, compact structure and expanded application range Effect

Inactive Publication Date: 2014-06-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to propose a system and a method for combining low-temperature dry distillation of lignite with upgrading in order to address the shortcomings of the existing lignite drying process, such as high energy consumption, low efficiency, and waste of resources. Tar contains a large amount of highly polar organic substances, which can combine with the moisture in lignite under certain temperature and pressure, so as to achieve the purpose of upgrading and dehydration, such as: aromatic compounds and phenolic compounds contained in coal tar dehydration

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  • Lignite low-temperature carbonization and upgrading combined system and method

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Embodiment 1

[0025] Such as figure 1 As shown, a low-temperature dry distillation of lignite combined with an upgrading system includes a raw coal silo 1, a crusher 2, a coke oven 3, a condenser 4, a semi-coke cooler 5, a semi-coke storage silo 6, a reactor 7, and a dry lignite silo 8. The solid-liquid separator 9, the separated liquid storage tank 10 and the coal tar storage tank 11. The raw coal bunker 1 is connected to the crusher 2, the crusher 2 is connected to the material inlet of the coke oven 3, and the gas phase product outlet of the coke oven 3 and condensation The gas phase outlet of condenser 4 is connected to coke oven 3, the liquid phase outlet of condenser 4 is connected to semi-coke desuperheater 5, reactor 7, solid-liquid separator 9 in turn, semi-coke desuperheater 5 is connected to semi-coke storage bin 6 is connected, the liquid phase outlet of the solid-liquid separator 9 is connected to the separated liquid storage tank 10, the separated liquid storage tank 10 is conn...

Embodiment 2

[0033] The low-temperature dry distillation and upgrading system of lignite in this example is the same as the previous example.

[0034] A method for combining low-temperature dry distillation and upgrading of lignite includes the following steps:

[0035] (1) The Xiaolongtan lignite is sent to the lignite crusher for crushing. After crushing, the lignite particles larger than 2mm are sent to the coke oven for low-temperature dry distillation, and the particles smaller than 2mm are sent to the reactor for reaction.

[0036] (2) Send 1t of crushed lignite larger than 2mm into a coke oven for low-temperature dry distillation, control the dry distillation temperature to 540°C for low-temperature dry distillation for 1 hour, dry distillation produces about 0.47t of high-temperature semi-coke and about 106Nm of dry distillation gas 3 , Coal tar 0.037t, lignite semi-coke is used to heat the newly produced coal tar and the recycled coal tar 1.75t, the temperature of the heated coal tar is 1...

Embodiment 3

[0041] The low-temperature dry distillation and upgrading system of lignite in this example is the same as the previous example.

[0042] A method for combining low-temperature dry distillation and upgrading of lignite includes the following steps:

[0043] (1) The Xiaolongtan lignite is sent to the lignite crusher for crushing. After crushing, the lignite particles larger than 2mm are sent to the coke oven for low-temperature dry distillation, and the particles smaller than 2mm are sent to the reactor for reaction.

[0044] (2) Send 1t of crushed lignite larger than 2mm into a coke oven for low-temperature dry distillation. Control the dry distillation temperature to 600℃ for low-temperature dry distillation for 1 hour. Dry distillation produces about 0.44t of high-temperature semi-coke and about 113Nm of dry distillation gas. 3 , Coal tar 0.04t, lignite semi-coke is used to heat the newly produced coal tar and the recycled coal tar 1.75t, the temperature of the coal tar after heatin...

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Abstract

The invention discloses a lignite low-temperature carbonization and upgrading combined system and method. The system comprises a raw coal bin, a crusher, a coke oven, a condenser, a semicoke cooler, a semicoke storage bin, a reaction kettle, a lignite drying bin, a solid-liquid separator, a separated liquid storage tank and a coal tar storage tank, wherein the raw coal bin is connected with the crusher; the crusher is connected with the material inlet of the coke oven; the gas phase product outlet of the coke oven is connected with the condenser; the gas phase outlet of the condenser is connected with the coke oven; the liquid phase outlet of the condenser is connected with the semicoke cooler, the reaction kettle and the solid-liquid separator sequentially; the semicoke cooler is connected with the semicoke storage bin; the liquid phase outlet of the solid-liquid separator is connected with the separated liquid storage tank; the separation liquid storage tank is connected with the semicoke cooler and the coal tar storage tank; and a solid phase outlet of the solid-liquid separator is connected with the lignite drying bin. According to the system and the method, no additional heat source is required in the lignite drying process, so that a whole technology is compact in structure, good in economical efficiency, high in efficiency, and easy to popularize in a large area.

Description

Technical field [0001] The invention relates to the field of coal chemical industry and lignite drying and upgrading, in particular to a system and method for combining low-temperature dry distillation of lignite to upgrading. Background technique [0002] Coal dry distillation is one of the important processes of coal chemical industry. It mainly refers to the process in which coal is heated and decomposed in isolation of air to produce coke (or semi-coke), coal tar, crude benzene, gas and other products. According to the different heating temperature, it can be divided into three types: 900℃-1100℃ is high temperature dry distillation, namely coking; 700℃-900℃ is medium temperature dry distillation; 500℃-600℃ is low temperature dry distillation. [0003] At present, three-stage furnace and blue coal square furnace are mainly used for low-temperature carbonization of lignite. The combustion method is mostly the internal heating process of direct contact heating. The internal heatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/04C10B57/10
Inventor 刘猛段钰锋马贵林黄冰冰
Owner SOUTHEAST UNIV