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Liquid steel slag dry-process granulating device and sensible heat recovery method

A liquid steel slag and sensible heat recovery technology, which is applied in the field of iron and steel metallurgy, can solve the problems of low heat recovery efficiency, large granulator volume, and high energy consumption of the system, and achieve high heat recovery efficiency, complete recovery, and reduced height.

Inactive Publication Date: 2013-05-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In view of the shortcomings of the granulated steel slag produced by the existing technology, such as coarse particle size, comprehensive utilization, subsequent grinding and processing, large granulator volume, high energy consumption of the system and low heat recovery efficiency, the purpose of the present invention is to provide a The liquid steel slag dry granulation and sensible heat recovery device can realize the high degree of micronization and rapid cooling of liquid steel slag, and then realize the efficient recovery of sensible heat and the processing technology of short process and high value-added slag products

Method used

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  • Liquid steel slag dry-process granulating device and sensible heat recovery method
  • Liquid steel slag dry-process granulating device and sensible heat recovery method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: a liquid steel slag dry granulation device, such as figure 1 or figure 2 As shown, it includes a feed device, a dry granulator, a cyclone separator, a drum-type sensible heat recovery device, and a waste heat boiler connected to the upper part of the cyclone separator. The dry granulator, cyclone separator, and drum-type sensible heat recovery The heat recoverers communicate with each other.

[0037] Wherein, the feeding device includes a material storage container 2 and a diversion tank 3, both of which are made of refractory materials, and are arranged on the bottom or side of the slag discharge port of the blast furnace 1, and a liquid steel slag discharge port 4 is provided at the bottom of the diversion tank 3 and is connected with the The dry granulators 9 are connected, and the slag outlet 4 is round or flat and rectangular. The material storage container 2 mentioned above is 1m higher than the liquid steel slag drop outlet 4, and the diversion g...

Embodiment 2

[0044] Embodiment two: a kind of liquid steel slag dry granulation device, such as figure 1 or figure 2 As shown, the storage container 2 is 3m higher than the liquid steel slag drop outlet 4, and the diversion groove 3 forms an inclination angle of 20° with the horizontal plane; the bottom of the dry granulator 9 is parallel to the horizontal plane.

[0045] The angle α between the outlet axis of the low-pressure granulation nozzle and the horizontal line is 90°; the pressure of the sprayed low-pressure airflow is 0.05MPa. The angle β between the outlet axis of the high-pressure granulation nozzle 6 and the horizontal line is 25°. The particle size distribution of solid particles carried by the airflow is 0.01mm.

[0046] Described high-speed turntable 7 rotating speeds are 2000 rev / mins. The drum type sensible heat recovery device is 5° away from the ground. All the other are the same as embodiment one.

Embodiment 3

[0047] Embodiment three: a kind of liquid steel slag dry granulation device, such as figure 1 or figure 2 As shown, the storage container 2 is 1.5m higher than the liquid steel slag drop outlet 4, and the diversion tank 3 is at an angle of 50° to the horizontal plane; the bottom of the dry granulator 9 is at a 45° angle to the horizontal plane.

[0048] The angle between the outlet axis of the low-pressure granulation nozzle and the horizontal line α is 20°; the pressure of the sprayed low-pressure airflow is 0.5MPa. The angle β between the outlet axis of the high-pressure granulation nozzle 6 and the horizontal line is 90°. The particle size distribution of solid particles carried by the airflow is 0.08mm.

[0049] Described high-speed turntable 7 rotating speeds are 20000 rev / mins. The drum-type sensible heat recovery device is at 40° to the ground. All the other are the same as embodiment one.

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Abstract

The invention relates to a liquid steel slag dry-process granulating device and a sensible heat recovery method. The liquid steel slag dry-process granulating device comprises a feeding device, a dry-process granulator, a cyclone separator and a sensible heat recovery device, wherein the dry-process granulator, the cyclone separator and the sensible heat recovery device are mutually communicated.The granulating method comprises the following steps: liquid steel slag enters the dry-process granulator through the feeding device and is granulated into fine steel slag granules, and enters the roller type sensible heat recovery device with solid particles separated by the cyclone separator to recover the sensible heat. The invention has the advantages that the grain size of the granulated steel slag is small and uniform, the sensible heat recovery efficiency is high, the occupied area is small and the investment cost is low.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a liquid steel slag dry granulation device and a sensible heat recovery method, and is also suitable for liquid slag produced in the steelmaking process and entrained bed gasifiers, coal-fired boilers and plasma The liquid slag discharged from the waste treatment furnace is granulated and sensible heat is recovered. Background technique [0002] my country is a big iron and steel smelting country in the world. In 2009, the total amount of steel produced exceeded the sum of the next 14 countries, and the annual steel production was 568 million tons. One ton of pig iron smelted in a blast furnace produces approximately 300kg of slag at a temperature of 1300°C to 1700°C, and approximately 170 million tons of blast furnace slag is produced throughout the year, and the heat contained in it is equivalent to the calorific value of approximately 10 million t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06F27D17/00
CPCY02P10/20Y02W30/50
Inventor 汤根土胡万起李竹川王晓岚
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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