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Method of blast furnace slag granulation and waste heat recovery

A waste heat recovery and blast furnace slag technology, applied in recycling technology, furnace, waste heat treatment and other directions, can solve the problems of reducing the particle size of granulated slag, low waste heat recovery efficiency, and large particle size of granulated slag, and achieves good fluidity, The effect of suppressing the formation of slag film

Active Publication Date: 2018-11-13
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for blast furnace slag granulation and waste heat recovery in order to solve the problem of low waste heat recovery efficiency and large granulated slag particle size in the blast furnace slag granulation process in the prior art. Blast furnace slag is heated to maintain the fluidity of blast furnace slag, inhibit the generation of slag film, reduce the particle size of granulated slag, and recover the cooling water to take away the heat of blast furnace slag to realize resource utilization

Method used

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  • Method of blast furnace slag granulation and waste heat recovery
  • Method of blast furnace slag granulation and waste heat recovery
  • Method of blast furnace slag granulation and waste heat recovery

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Embodiment 1

[0049] combine Figure 1~4 As shown in and 6, a method for blast furnace slag granulation and waste heat recovery in this embodiment, the blast furnace slag on the rotating slag pan 210 moves to the edge of the rotating slag pan 210 during the rotation, and the heating part of the rotating slag pan 210 211 heats and keeps the blast furnace slag; after the blast furnace slag leaves the rotating slag pan 210, the cooling mechanism 220 cools the blast furnace slag, and the cooled blast furnace slag forms granulated slag; the cooling water sprayed by the cooling mechanism 220 is heated and gasified by the blast furnace slag to form Water vapor, the water vapor enters the heat exchange unit 400 through the granulated slag outlet 510 , where the water vapor performs heat exchange treatment and waste heat utilization in the heat exchange unit 400 . Such as Image 6 As shown, the specific steps are:

[0050] Step 1: The blast furnace slag stored in the slag pot 110 flows into the ro...

Embodiment 2

[0062]The basic content of this embodiment is the same as that of Embodiment 1, the difference is that: the slag nozzle 221 is arranged above the edge of the rotating slag pan 210. In this embodiment, there are 16 slag nozzles 221, and the slag nozzle 221 rotates along the The circumference above the edge of the slag pan 210 is uniformly distributed. In this embodiment, the slag nozzle 221 uses gas as a carrier to spray fine-grained slag to the edge of the rotating slag pan 210. The carrier for spraying granulated slag can also be other fluids such as water. The smaller granulated slag makes the granulated slag with a certain kinetic energy collide with the blast furnace slag at the edge of the rotating slag pan 210 to grow up. Secondary production and utilization of the granulated slag under resource utilization conditions; on the other hand, the slag film is broken through the impact of the smaller granulated slag and the air-based carrier, preventing the formed slag liquid ...

Embodiment 3

[0066] combine Figure 5 As shown, the basic content of this embodiment is the same as that of Embodiment 1, the difference is that: a raised surface 216 is provided between two adjacent slag troughs 212, and stoppers are provided at both ends of the circumferential edge of the raised surface 216. plate 217, so that the baffle plate 217 is located on both sides of the slag outlet of the slag flow tank 212, and the slag outlet of the slag flow tank 212 is the circumferential side 215. Its function is: the blast furnace slag located on the rotating slag pan 210 moves towards the edge of the rotating slag pan 210 under the action of centrifugal force, and part of the blast furnace slag flows out along the slag flow groove 212 through the slag outlet; On the convex surface 216, and then flow to the peripheral edge of the convex surface 216, when this part of the blast furnace slag moves to the peripheral edge position of the convex surface 216, it will be blocked by the baffle pla...

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Abstract

The invention discloses a method of blast furnace slag granulation and waste heat recovery, and belongs to the technical field of blast furnace slag utilization. The method of the blast furnace slag granulation and the waste heat recovery comprises the following steps that blast furnace slag on a rotary slag disk move to the edge position of the rotary slag disk in the process of rotating, heatingelement of the rotary slag disk carries out heating and heat prevention to the blast furnace slag to enable the blast furnace slag to maintain a higher temperature, thus the blast furnace slag has better liquidity, then the forming of a slag film is restrained to facilitate the granularity of granulated slag diminishing; A cooling mechanism cools the blast furnace slag after the blast furnace slag breaking away from the rotary slag disk, the blast furnace slag after cooling forms the granulated slag; meanwhile, cooling water ejected from the cooling mechanism is heated by the blast furnace slag to gasify and generate water vapor, the water vapor enters into a heat transfer unit through an outlet of the granulated slag, the water vapor carries out heat transfer processing and waste-heat utilization in the heat transfer unit, and the use ratio of energy sources is improved.

Description

technical field [0001] The invention relates to the technical field of utilization of blast furnace slag in the metallurgical industry, and more specifically relates to a method for blast furnace slag granulation and waste heat recovery. Background technique [0002] Blast furnace slag is one of the main products produced in the iron and steel production process, and it is also a very valuable secondary resource. Blast furnace slag generally has a temperature of 1350-1450°C and is discharged through the slag port or iron port of the blast furnace. At present, blast furnace slag is one of the most important wastes in the iron and steel industry. Every ton of pig iron produces about 300-600 kg of blast furnace slag. According to statistics, in 2017, China's pig iron output was about 710 million tons, and blast furnace slag was about 210-430 million tons. , Recycling one ton of blast furnace slag waste heat can roughly estimate that 100 degrees of electricity can be generated, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08F27D17/00
CPCC21B3/06C21B3/08F27D17/004Y02P10/20Y02P10/25Y02W30/50
Inventor 杨建杨佳龙孔卓桑彬佘文文王海军
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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