Low-rank coal carbonization process and system

A technology of low-rank coal and dry distillation, which is applied in special forms of dry distillation, direct heating dry distillation, petroleum industry, etc. It can solve the problems of high semi-coke ash content, low safety and reliability, and poor quality, and achieve high quality, safe and reliable process High durability and low ash content

Inactive Publication Date: 2016-03-09
HUADIAN HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of high ash content, poor quality, and low safety and reliability of the finished semi-coke produced by the lo

Method used

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  • Low-rank coal carbonization process and system
  • Low-rank coal carbonization process and system
  • Low-rank coal carbonization process and system

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

[0036] The low-rank coal dry distillation process described in this implementation includes the following steps:

[0037] (1) The raw coal is dried and preheated through a rotary drying furnace, and the raw coal is directly or indirectly contacted and heated to 150°C to reduce the moisture content of the raw coal to below 8%, and then the raw coal is transported to the inlet of the rotary retort furnace The material inlet and the hot semi-coke solid heat carrier are mixed according to a mass ratio of 1:1.5. The hot semi-coke solid heat carrier is a flue gas with a temperature of 1000°C and an oxygen content of 1.2% after direct contact and heating at a temperature of 750°C Hot half coke

[0038] (2) Then the raw coal and the hot semi-coke solid heat carrier are transported to the rotary dry distillation furnace for dry distillation, and the rotary dry distillation furnace is heated in indirect contact, and the temperature of the pyrolysis reaction is controlled to...

Example Embodiment

[0039] Example 2

[0040] The low-rank coal dry distillation process described in this implementation includes the following steps:

[0041] (1) The raw coal is dried and preheated through a rotary drying furnace, the raw coal is directly or indirectly contacted and heated to 245°C, the moisture content of the raw coal is reduced to less than 5%, and then the raw coal is transported to the rotary dry distillation furnace The hot semi-coke solid heat carrier is mixed with the hot semi-coke solid heat carrier in a mass ratio of 1:0.1, and the hot semi-coke solid heat carrier is heated by direct contact with flue gas with a temperature of 1200°C and an oxygen content of 0.1%, and the temperature is 1050 ℃ hot half coke;

[0042] (2) Then the raw coal and the hot semi-coke solid heat carrier are transported to the rotary dry distillation furnace for dry distillation, and the rotary dry distillation furnace is heated in indirect contact, and the temperature of the pyrolysis reaction is c...

Example Embodiment

[0043] Example 3

[0044] The low-rank coal dry distillation process described in this implementation includes the following steps:

[0045] (1) The raw coal is dried and preheated through a rotary drying furnace, and high-temperature flue gas is used to directly contact and heat the raw coal to 180°C to reduce the moisture content of the raw coal to less than 5%, and then transport the raw coal to the rotary dry distillation The feed port of the furnace is mixed with the hot semi-coke solid heat carrier at a mass ratio of 1:1. The hot semi-coke solid heat carrier is heated by direct contact with flue gas at a temperature of 1100°C and an oxygen content of 1.0%. Hot semi-coke at 800°C, the particle size of the hot semi-coke is 4mm or more;

[0046] (2) Then the raw coal and the hot semi-coke solid heat carrier are transported to the rotary dry distillation furnace for dry distillation, and high-temperature flue gas is used to indirectly contact and heat the rotary dry distillation f...

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Abstract

The invention provides a low-rank coal carbonization process and system. The low-rank coal carbonization process comprises the following steps: dried and preheated raw coal and a heated heat carrier are mixed for carbonization, pyrolysis is performed to produce hot carbocoal and raw coke oven gas, a part of the hot carbocoal is cooled to be served as a semicoke finished product, a part of the hot carbocoal is heated by being in direct contact with smoke with the temperature of 900-1200 DEG C and the oxygen content of less than or equal to 1.2 percent and not equal to 0, and then serves as the heat carrier, and purification and tar trapping are performed on the raw coke oven gas to obtain a gas finished product and a tar finished product. The problems that finished products produced by a low-rank coal carbonization process and system in the prior art are high in ash content, poor in quality and low in safety and reliability are solved.

Description

technical field [0001] The invention belongs to the technical field of coal dry distillation, and in particular relates to a low-rank coal dry distillation process and system. Background technique [0002] my country is rich in low-rank coal resources, and more than 50% of the proven coal reserves are low-rank coal, which contains volatile matter equivalent to 100 billion tons of oil and gas resources. Due to the disadvantages of low-rank coal such as high reactivity, easy spontaneous combustion, difficult long-distance transportation, high water content and low calorific value, the mining and utilization of coal resources in my country are mainly anthracite and bituminous coal, and the mining and utilization level of low-rank coal Low, it is mainly used as a power plant to burn coal. With the increasing demand for energy in our country, the resource shortage caused by the over-exploitation of anthracite and bituminous coal resources makes the development and utilization of ...

Claims

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Application Information

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IPC IPC(8): C10B53/04C10B49/16C10B57/18C10B57/10
Inventor 葛成荫段洋洲刘星张泽林伟宁刘斌
Owner HUADIAN HEAVY IND CO LTD
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