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Method and apparatus of blast furnace slag quench and heat recovery

A waste heat recovery and blast furnace slag technology, which is applied in the direction of recycling technology and process efficiency improvement, can solve the problems of increasing the flow rate of cooling medium, low quality of recovered heat, contradiction between cooling speed and heat recovery effect, etc., and achieve rapid cooling , Simple structure, easy installation

Active Publication Date: 2010-09-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To obtain a large cooling in a short period of time, the flow rate of the cooling medium must be increased, which will lead to low quality of recovered heat, resulting in a contradiction between cooling speed and heat recovery effect

Method used

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  • Method and apparatus of blast furnace slag quench and heat recovery
  • Method and apparatus of blast furnace slag quench and heat recovery
  • Method and apparatus of blast furnace slag quench and heat recovery

Examples

Experimental program
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Effect test

Embodiment 1

[0016] A blast furnace slag quenching and waste heat recovery device, Figure 1 shows the working system and the blast furnace slag, cooling water circulation loop, using a circulating fluidized bed to quench the blast furnace slag and recover waste heat, the pipe connecting the riser to the separator is inclined to the direction of the separator 2, It forms an angle of 60° with the separator, and the inclination angle is used to avoid the accumulation of blast furnace slag at the slag inlet. 3. A coarse slag discharge port 4 is provided. The storage tank 3 is connected to the riser 7. The lower end of the riser 7 is provided with an air distribution plate 5 and a fine slag discharge port 6. A water wall 8 is arranged around the separator 2 and the storage tank 3.

[0017] The cooling water in the water wall 8 is provided by the bypass 9 of the boiler feed water pump, and the cooling water passing through the water wall 8 enters the boiler economizer 11 through the booster pump ...

Embodiment 2

[0020] The device of Example 1 is used to quench the blast furnace slag and recover waste heat. The steps of the method are as follows. After the blast furnace slag is discharged from the blast furnace, it enters the circulating fluidized bed through the blast furnace slag inlet 1, and the fan 12 is provided by the air distribution plate of the riser 7. Fluidizing wind blows the blast furnace slag into the separator 2 to achieve gas-solid separation, and the blast furnace slag after gas-solid separation enters the storage tank 3, and the water wall 8 arranged outside the separator 2 is connected with the fluidizing wind Working together, the blast furnace slag is rapidly cooled and granulated, and the granulated slag enters the storage tank 3, and the fluidizing wind provided by the fan 12 under the storage tank 3 causes the blast furnace slag to form bubbles in the storage tank 3 bed, on the one hand, the fluidizing wind and the water wall 8 arranged outside the storage tank 3...

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Abstract

The present invention discloses method and apparatus of blast furnace slag quench and heat recovery belongs to blast furnace slag quench and heat recovery technology field. The apparatus is composed of feed inlet, gas / solid separator, storage tank, lift pipe, wind-supply system, cooling water system. The invention ejects the blast furnace slag into circulating fluid bed, through fluidization windto bring the blast furnace slag into cyclone separator to implement separation of gas and solid, simultaneity the water wall dual cooling system around the fluidization wind and gas-solid separator cooling down the blast furnace slag rapidity to get the quench impression; the separated blast furnace slag goes into the storage tank and access the fluidization wind from the bottom to make the blastfurnace slag in bubbling bed status, and further cooling to implement ejecting slag layer by layer; the cooling wind and cooling water goes into the boiler after pressure treatment, implementing heatrecovery totally. The invention is provided with advantages of cooling rapidly and fully; effective heat recovery; good graining impression; ejecting slag layer by layer; simple system structure and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of blast furnace slag quenching and waste heat recovery, in particular to a method and device for blast furnace slag quenching and waste heat recovery. Background technique [0002] Blast furnace slag is a by-product of converting iron ore into pig iron in a blast furnace, and its main components are CaO, SiO 2 、Al 2 o 3 and MgO. The blast furnace slag after quenching treatment has good hydraulic gelling properties, so it can be recycled to produce high value-added products such as cement; at the same time, since its temperature is about 1400-1600 °C, the heat taken away by each ton of slag It is equivalent to about 60kg of standard coal, so the recovery and utilization of waste heat is also an important aspect. [0003] Water quenching process is a kind of blast furnace slag quenching treatment method, which has been widely used at present. The advantage is that the cooling speed is fast, and the quali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06
CPCY02P10/20Y02W30/50
Inventor 杨海瑞胡南杨石李文凯司小东岳光溪
Owner TSINGHUA UNIV