Comprehensive utilization system and method of low rank coal

A low-rank coal and pulverized coal technology, which is applied in the field of comprehensive utilization system of low-rank coal, can solve the problems of low pulverized coal pelletization rate, low pellet strength, and more hemispheres, so as to improve pelletization rate and reduce gas explosion Phenomenon, the effect of reducing ash content

Pending Publication Date: 2017-12-19
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

By using pyrolysis high-temperature flue gas for pulverized coal sorting and discharging gangue, and adopting waste heat recovery device to recover the waste heat of pyrolysis gas as the gas removal medium in pulverized coal, it solves the problem of low pulverized coal ball formation rate, more hemispheres, severe gas explosion, The low-strength problem of the ball not only makes full use of the latent heat of the pyrolysis gas, saves energy, but also protects the stable and continuous operation of the molding equipment and system

Method used

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  • Comprehensive utilization system and method of low rank coal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Firstly, the raw coal is sent from the coal bunker to the screening device 100 through the bucket elevator. The aperture of the screening device is 5mm, and the above-screen lump coal and the under-screen pulverized coal are obtained. The obtained lump coal on the sieve is transported to the rotary bed pyrolysis device 600 through a belt for pyrolysis. The pyrolysis temperature is 600°C and the pyrolysis time is 2.5 hours to obtain pyrolysis semi-coke and pyrolysis gas. High temperature flue gas is discharged from the flue. The pyrolysis gas is sent to the second waste heat recovery device 800 to obtain tar, coal gas and second steam. The obtained tar is oxidized in the tar oxidation device 900, the oxidation temperature is 250° C., the oxidation time is 3 hours, and the air flow rate is 0.5 L / h to obtain a binder for pulverized coal molding. The obtained under-screen pulverized coal is transported to the airflow separation device 200 through a belt, and the high-tempe...

Embodiment 2

[0061] Firstly, the raw coal is sent from the coal bunker to the screening device 100 through the bucket elevator. The aperture of the screening device is 5mm, and the above-screen lump coal and the under-screen pulverized coal are obtained. The obtained lump coal on the sieve is conveyed to the rotary bed pyrolysis device 600 through a belt for pyrolysis. The pyrolysis temperature is 700°C and the pyrolysis time is 1h to obtain pyrolysis semi-coke and pyrolysis gas. At the same time, from the pyrolysis device High temperature flue gas is discharged from the flue. The pyrolysis gas is sent to the second waste heat recovery device 800 to obtain tar, coal gas and second steam. The obtained tar is oxidized in the tar oxidation device 900, the oxidation temperature is 270° C., the oxidation time is 2 hours, and the air flow rate is 5 L / h to obtain a binder for pulverized coal molding. The obtained under-screen pulverized coal is transported to the airflow separation device 200 th...

Embodiment 3

[0065] Firstly, the raw coal is sent from the coal bunker to the screening device 100 through the bucket elevator. The aperture of the screening device is 5mm, and the above-screen lump coal and the under-screen pulverized coal are obtained. The obtained lump coal on the sieve is transported to the rotary bed pyrolysis device 600 through a belt for pyrolysis. The pyrolysis temperature is 900°C and the pyrolysis time is 1.5h to obtain pyrolysis semi-coke and pyrolysis gas. High temperature flue gas is discharged from the flue. The pyrolysis gas is sent to the second waste heat recovery device 800 to obtain tar, coal gas and second steam. The obtained tar is oxidized in the tar oxidation device 900, the oxidation temperature is 350° C., the oxidation time is 1 h, and the air flow rate is 10 L / h to obtain a binder for pulverized coal molding. The obtained pulverized coal under the sieve is transported to the airflow separation device 200 through a belt, and the high-temperature ...

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Abstract

The invention discloses a comprehensive utilization system of low rank coal. The system comprises a sieving device, a gas flow sorting device, a powdered coal steam treatment device, a mixing and kneading device, a molding device, a pyrolysis device, a first waste heat recycling device, a second waste heat recycling device and a coke tar oxidization device. The invention further provides a method for comprehensively utilizing the low rank coal by utilizing the system. By adopting the system and the method, disclosed by the invention, the problems that the powdered coal pelletizing rate is low, more semi-balls are formed, gas explosion is serious and the strength of molded balls is low are solved; the potential heat of pyrolysis gas is sufficiently utilized and energy sources are saved; meanwhile, stable and continuous operation of molding equipment and system is protected.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of low-rank coal, and more specifically, to a system and method for comprehensive utilization of low-rank coal. Background technique [0002] Coal is an important part of the world's primary energy, and coal occupies the first place in the world's energy. China is the world's largest coal producer and consumer. Coal production accounts for 37% of the world's total coal production, and the proportion of coal in my country's primary energy structure is about 70%. my country has a complete range of coal resources, among which low-rank coal reserves are the largest. Most of the lumpy low-rank coal in China is made into semi-coke through pyrolysis, which is widely used in submerged arc furnaces, ferroalloys, yellow phosphorus, calcium carbide smelting, coal-to-gas, and various kiln combustion. The property is not good, and the pyrolysis cannot be carried out smoothly. At the same time, from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04
CPCY02P20/129C10B53/04
Inventor 祁娟刘涛邓鑫高建赵飞翔吴道洪
Owner SHENWU TECH GRP CO LTD
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