Transient dehydration upgrading method for high-water-content low-quality coal

A low-quality, coal-based technology, applied in the dehydration and upgrading of materials, and the transient dehydration and upgrading of high-moisture and low-quality coal, can solve the problems of poor dehydration effect, easy reabsorption, and easy spontaneous combustion, etc., to achieve good dehydration effect, The effect of simple process, cost and energy consumption reduction

Pending Publication Date: 2021-06-29
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art, the present invention provides a transient dehydration system and a method for improving the quality of coal with high water content and low quality, which overcomes the problems of poor dehydration effect, easy spontaneous combustion, and easy reabsorption in traditional dehydration methods

Method used

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  • Transient dehydration upgrading method for high-water-content low-quality coal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Such as figure 1 As shown, a method for transient dehydration and upgrading of high-moisture and low-quality coal is composed of a steam generation system 2, an electric control system 1, a steam dehydration system and a steam recovery system 9, and a pressure sensing device 3, 6. Temperature sensing device 5, airtight plugs 7, 12 are installed under the feeding device 4 of the reaction kettle 11 and on the discharge port.

[0017] Include the following steps

[0018] (1) The wet material is fed through the feeding device 4 above the steam dehydration system;

[0019] (2) Then, the saturated steam is added into the reaction kettle 11 by the steam generating device 2 through the inlet valve 10, and then the heating device of the electric control system 1 is adjusted to a high temperature and high pressure state, and the system maintains a high temperature and high pressure state for a certain period of time;

[0020] (3) The pressure relief valve 8 in the reaction kett...

Embodiment 2

[0024] The moisture content of the wet coal slime is 25.79%, and it is added to the feeding platform from the entrance. When the feeding platform is fully loaded, the sealing valve connecting the steam dehydration platform and the feeding platform is opened, and the feeding platform moves forward, turning into steam dehydration platform. Then add saturated steam into the reaction kettle from the steam generating device, and then adjust it to 1.5MPa, 120°C state by the heating device, and keep the system at high temperature and high pressure for 8 minutes. During this stage, the saturated water vapor will take away the moisture inside the slime through gas-liquid exchange. ; The pressure relief valve in the reactor is opened, the environment in the reactor changes to normal temperature and pressure instantaneously, and the internal steam is introduced into the steam recovery device through the pressure relief port. The sealing valve between the dehydration platform and the unlo...

Embodiment 3

[0026] The moisture content of the wet coal slime is 26.42%, and it is added to the feeding platform from the entrance. When the feeding platform is fully loaded, the sealing valve connecting the steam dehydration platform and the feeding platform is opened, and the feeding platform moves forward, turning into steam dehydration platform. Then add saturated steam to the reaction kettle from the steam generating device, and then adjust it to 3MPa, 200°C state by the heating device, and keep the system at high temperature and high pressure for 40 minutes. During this stage, the saturated water vapor will take away the moisture inside the slime through gas-liquid exchange; The pressure relief valve in the reaction kettle is opened, the environment in the reaction kettle changes to normal temperature and pressure instantaneously, and the internal steam is introduced into the steam recovery device through the pressure relief port. The sealing valve between the dehydration platform a...

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Abstract

The invention belongs to the technical field of mineral processing, and particularly relates to a transient dehydration upgrading method for high-water-content low-quality coal. Materials are added through a feeding port above a steam dehydration system, then saturated steam is added into the materials through a steam generation system, the materials are adjusted to be in a high-temperature and high-pressure state through an electric control system, the pressure is continuously stabilized for a certain time, and in the stage, the saturated steam takes away moisture in the materials through gas-liquid exchange; then the electric control system controls a pressure relief valve to instantaneously relieve pressure to a normal-temperature and normal-pressure state, instantaneous steam explosion is generated in a steam dehydration system in the process, a pore structure in the materials is damaged by the steam explosion, then internal steam is guided into a steam recovery system through a pressure relief opening, and the materials are discharged from the discharging opening in the lower portion and conveyed out through a conveying belt. The device solves the problems that a traditional material dehydration device is poor in effect and prone to spontaneous combustion and reabsorption, the dehydration process is carried out in the saturated water steam environment, the dehydration effect is good, the spontaneous combustion probability is low, safety is high, steam explosion generated in the instantaneous dehydration process can damage the internal pore structure of materials, and reabsorption after dehydration can be prevented.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for transient dehydration and upgrading of coal with high water content and low quality, which is suitable for dehydration and upgrading of materials. Background technique [0002] Mineral dressing products usually contain a lot of water. In order to meet the needs of smelting and other processing departments, it is necessary to remove water from mineral dressing products. At present, the traditional low-quality coal dehydration methods in my country have the disadvantages of poor dehydration effect, easy spontaneous combustion, and easy reabsorption. At present, avoiding spontaneous combustion and reabsorption during dehydration of low-quality coal and improving the dehydration efficiency of low-quality coal are the key issues faced by low-quality coal dehydration technology. Contents of the invention [0003] In order to overcome the deficienci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/00
CPCC10L9/00
Inventor 张博闫光辉刘晋芳孙宗盛巩林盛郭天洋
Owner CHINA UNIV OF MINING & TECH
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