A device and recovery method for recovering blast furnace slag waste heat

A recovery method and blast furnace slag technology, applied in the field of steel energy conservation, can solve the problems of difficult recycling of fluid water, low thermal efficiency, complex equipment, etc., and achieve the effects of improving waste heat recovery efficiency, low heat dissipation, and reducing energy loss

Active Publication Date: 2018-08-03
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a certain effect in the slag granulation process, but not only the recovery and utilization of the subsequent fluid water is difficult, the thermal efficiency is low, but also the equipment is complicated and the control is difficult

Method used

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  • A device and recovery method for recovering blast furnace slag waste heat

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Embodiment 1

[0018] According to 2580m 3 Take a blast furnace as an example, a single tapping is 420t, slag is 126t, the tapping temperature is 1480°C, and the temperature of the slag reaching the exit of the slag tunnel is 1300°C, so the initial heat of the blast furnace slag is 202GJ. Using this method to recover the waste heat of blast furnace slag, the molten blast furnace slag at 1480°C is mixed with high thermal conductivity metal balls with a diameter of 100mm at room temperature, a thermal conductivity of 155kJ / m·h·°C, and a total weight of 252t in the slag tank; the forming temperature is about It is a solid mixture of blast furnace slag and metal balls at 500°C to 800°C; the ball slag ratio (mass ratio) is 1:2, and the solid mixture of blast furnace slag and steel balls is poured into the rotating metal cage in the heat recovery equipment through the feed gate Inside, the metal cage has an aperture of 55mm and a heat-resistant strength of 20 kgf / mm 2 (600°C), impact toughness 40...

Embodiment 2

[0020] According to 3200m 3 Take a blast furnace as an example, a single tapping is 655t, slag is 196.5t, the tapping temperature is 1480°C, and the temperature of the slag reaching the exit of the slag tunnel is 1300°C, so the initial heat of the blast furnace slag is 311GJ. Using this method to recover the waste heat of blast furnace slag, the molten blast furnace slag at 1480°C is mixed with high thermal conductivity metal balls with a diameter of 150mm at room temperature, a thermal conductivity of 160kJ / m·h·°C, and a total weight of 393t in the slag tank; the formation temperature is about It is a solid mixture of blast furnace slag and metal balls at 500°C to 800°C; the ball slag ratio (mass ratio) is 2, and the solid mixture of blast furnace slag and steel balls is poured into the rotating metal cage in the heat recovery equipment through the feed gate. Metal cage aperture 60mm, heat resistance 20 kgf / mm 2 (600°C), impact toughness 40 kgf / mm 2 (600°C), the metal cage ...

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Abstract

The invention discloses a device for recovering waste heat of blast furnace slag, and a recovery method. The device comprises a slag tank, a charge door, heat recovery equipment, a rotary metal cage, an air inlet main tube, a hot air outlet port, a rotary sealing valve, a deslagging port, a multi-channel air inlet port, a motor and other components, wherein the heat recovery equipment and the rotary metal cage are coaxially connected to the motor; the air inlet port is formed in the lower part of the side wall of the heat recovery equipment along an axial direction and connected with the air inlet main tube; the deslagging port is formed in the bottom; a hole is formed and the hot air outlet port is installed in the top; the molten blast furnace slag at a temperature of 1450-1500 DEG C is mixed with high-thermal-conductivity metal balls in a normal-temperature state in the slag tank; the rotational speed of the rotary metal cage is 30-120r / min; and cold air is supplied to the air inlet main tube, a flow rate is 200000-400000Nm<3> / h, and a pressure is 15-20kPa. The device and the recovery method, which are disclosed by the invention, have the following advantages and effects: the technical process is short, heat dissipation is low, energy loss during a recovery process is reduced while the cooling intensity of the blast furnace slag is met, the sensible heat and latent heat of the blast furnace slag are efficiently recovered, and the recovery efficiency of the waste heat is increased.

Description

technical field [0001] The invention belongs to the field of iron and steel energy saving, and in particular relates to a device and a recovery method capable of efficiently recovering waste heat of blast furnace slag. Background technique [0002] While producing molten iron, the blast furnace also produces a large amount of liquid blast furnace slag. Liquid blast furnace slag contains high heat energy, and the heat contained in each ton of blast furnace liquid slag is close to the heat contained in 64kg of standard coal. It is a high-grade waste heat resource and has a high recycling value. At the same time, blast furnace slag is a silicate material with good performance, which can be used as a raw material for the production of building materials and chemical fertilizers. Blast furnace slag after quenching treatment has potential hydraulic gelling properties and is an excellent cement raw material. Therefore, various research and development institutions at home and abro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/04F27D17/00
CPCY02P10/20Y02P10/25Y02W30/50
Inventor 刘常鹏贾启超马光宇李卫东王太祥张天赋龙承俊袁玲贾振孙守斌
Owner ANGANG STEEL CO LTD
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