Heat recovery method for blast furnace slag

A heat energy recovery and blast furnace slag technology, applied in waste heat treatment, energy efficiency improvement, furnace and other directions, can solve problems such as environmental pollution, achieve high granulation efficiency, improve heat transfer speed, and accelerate heat transfer and solidification speed.

Active Publication Date: 2013-01-02
SCIMEE TECH & SCI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production of steel products, a large amount of waste is also discharged, causing serious pollution to the environment

Method used

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  • Heat recovery method for blast furnace slag

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Experimental program
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Effect test

Embodiment

[0023] When the high-temperature blast furnace slag at a temperature of 1500°C enters the fluidized bed through the tank, the high-pressure air in the lower part of the tank blows the blast furnace slag melt to complete granulation; The cold slag meets and collides in the fluidized bed. The amount of cold slag sprayed by the cold slag nozzle at high speed accounts for 15% of the total amount of molten slag. The upward spraying angle of the cold slag nozzle is 35°. The bead flows are the same, forming an angle of 25° with each other; the slag particles after the collision are violently mixed with the cold air through the air distribution device for heat exchange, and the slag beads are cooled to 300°C; the cooled slag beads are used as cement raw materials, and the The vitreous body content reaches 95%, the heated heat exchange air enters the waste heat boiler, and the saturated steam generated by the waste heat boiler flows through the top of the fluidized bed for further heati...

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Abstract

The invention belongs to the energy recycling field and particularly relates to a heat recovery method for blast furnace slag in metallurgy and steel industries. The heat recovery method includes that: step one, high pressure air on the lower portion of a tank blows the blast furnace slag melt into pieces to complete granulation when the blast furnace slag melt enters a fluidized bed through the tank; step two, granulated slag particle stream in the step one meets and collides with cold slag sprayed by a cold slag nozzle at a high speed in the fluidized bed; step three, the slag particles after collision are violently mixed with cold air for heat exchange through an air distributing device, and slag beads are cooled; and step four, the cooled slag beads are transported out as the raw material of cement, heated heat exchange air enters a waste heat boiler, saturated steam stream produced by the waste heat boiler is further heated to become superheated steam when passing the top of the fluidized bed, and then the superheated steam enters a generating set to generate electricity. The heat recovery method has the advantages that the granulation efficiency is high, mutual adhesion of slag particles is reduced, and the like.

Description

technical field [0001] The invention relates to the field of energy recovery and utilization, in particular to a heat energy recovery method for processing blast furnace slag in the metallurgy and iron and steel industries. Background technique [0002] The iron and steel industry provides important basic raw materials for the development of the national economy, and is a resource-intensive industry that consumes a lot of energy and resources. While producing steel products, a large amount of waste is also discharged, causing serious pollution to the environment. Although the iron and steel industry is a major energy consumer and pollutant discharger in the national economy, it is also one of the industries with great potential for energy conservation and emission reduction. Among them, recycling all kinds of waste heat is an important breakthrough for further energy saving in the iron and steel industry. [0003] Blast furnace slag is a by-product formed from gangue in or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/08F27D17/00
CPCC21B2400/026C21B2400/062C21B2400/072C21B2400/076C21B2400/08Y02P10/25Y02P40/121
Inventor 葛加坤倪明亮
Owner SCIMEE TECH & SCI CO LTD
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