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Circulating fluidized bed fire coal ash grading treatment method

A circulating fluidized bed, coal-fired ash technology, applied in chemical instruments and methods, sustainable waste treatment, separating solids from solids with airflow, etc., can solve problems such as limited screening and separation effects

Active Publication Date: 2022-03-25
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts the method of first crushing and then screening to classify coal gasification slag, which has achieved good results, but the effect of screening and separating ultrafine particles is limited.

Method used

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  • Circulating fluidized bed fire coal ash grading treatment method
  • Circulating fluidized bed fire coal ash grading treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] For the fly ash and bottom slag of a certain power plant, the particle size distribution of the fly ash is 0-100μm, and the fly ash samples are directly tested figure 2 The multi-stage airflow separation system shown is used for separation, using the air heated by the partition wall at 100°C as the carrier gas for airflow separation, and by adjusting the centrifuge speed and other conditions, the particle size range of 0-20% is obtained with a mass yield of 25%. Micron superfine powder particles, the mass yield is 30% of the fine particles with a particle diameter in the range of 21-50 μm, and the mass yield of the coarse particles with a particle diameter in the range of 51-100 μm is 45%. For ultra-fine powder particles of 0-20 microns, use phthalate coupling agent to modify them, make phthalate coupling agent: ethanol at a ratio of 0.5: 1 to form a modified solution, and use an ultrasonic atomization device to spray Spray evenly in the superfine powder particles stir...

Embodiment 2

[0060] For the fly ash and bottom slag of a certain power plant, the particle size distribution of the fly ash is 0-300μm, and the fly ash samples are directly fed to figure 2 The multi-stage gas flow separation system shown is used for separation, and the aqueous solution (sodium dodecylbenzenesulfonate: ethanol = 0.5:1) added with sodium dodecylbenzenesulfonate is placed at the inlet of the carrier gas suction (at 25°C ), make the carrier gas the carrier gas containing the aqueous solution of saturated sodium dodecylbenzene sulfonate, and carry out airflow classifier separation, by adjusting the centrifuge speed and other conditions, the obtained mass yield is 20% in the particle size range 0-20 micron ultrafine powder particles, the mass yield is 25% of the fine particles with a particle diameter in the range of 21-150 μm, and the mass yield of 55% of the coarse particles with a particle diameter in the range of 151-300 μm. For the ultrafine powder particles of 0-20 micron...

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Abstract

The invention discloses a circulating fluidized bed fire coal ash grading treatment method which comprises the following steps that fire coal ash collected by a circulating fluidized bed is primarily screened to obtain primarily screened materials, and the particle size of fire coal ash particles in the primarily screened materials is not larger than 500 micrometers; and carrying out multi-stage separation treatment on the primarily screened material to obtain fire coal ash particles in a plurality of particle size ranges. The invention belongs to the technical field of coal combustion. The technical scheme is a utilization technology of low-calorific-value fire coal ash which does not use acid and alkali and does not generate secondary pollutants. Based on physicochemical characteristics of low-calorific-value fire coal after combustion in a circulating fluidized bed, the low-calorific-value fire coal is subjected to grading separation, and then the low-calorific-value fire coal is applied to preparation of rubber filler reinforcing agents, light wall materials, self-leveling mortar, coal ash and slag ceramsite, road engineering concrete, ash and slag composite stabilized soil and other products according to graded material properties.

Description

technical field [0001] The invention relates to the technical field of coal combustion, in particular to a treatment method for separating and classifying coal burning ash in a circulating fluidized bed. Background technique [0002] The endowment characteristics of my country's energy resources determine that coal will remain the main supplier of my country's energy for a long period of time, and more than 70% of my country's electricity is supplied by coal. While coal provides my country with sufficient power resources and improves people's quality of life, it is also accompanied by a large amount of solid pollutant emissions. According to statistics, the annual discharge of fly ash in my country is nearly 600 million tons, and due to the low utilization rate, a large amount of ash waste has accumulated over the years. A large amount of ash is accumulated in the power plant's own slag yard or landfill, and there is a large amount of potential pollution. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07B9/02B04B5/10C04B20/02C04B38/00C04B18/10C04B18/08
CPCB07B9/02B04B5/10C04B20/02C04B20/023C04B38/009C04B18/10C04B18/08Y02W30/91
Inventor 张乾杨凯刘建伟高增林郝泽光黄伟
Owner TAIYUAN UNIV OF TECH