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Furnace top gas treatment technology for HIsmelt melting reduction furnace

A furnace top gas and processing technology technology, which is applied in the field of smelting reduction ironmaking, can solve the problems of the recovery and utilization of furnace top gas, high temperature, large gas volume, etc., and achieves the effects of reducing the burden of dust removal, easy operation, and efficient and feasible process

Inactive Publication Date: 2018-07-20
SHANDONG MOLONG PETROLEUM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with blast furnace ironmaking, the HIsmelt smelting reduction process produces top gas at 1500-1700 °C, which has the characteristics of large gas volume, high calorific value, and high temperature, and there is a certain amount of smoke in the top gas, so HIsmelt Recycling of furnace top gas presents great challenges

Method used

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  • Furnace top gas treatment technology for HIsmelt melting reduction furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] like figure 1 As shown in the figure, during the production process, the SRV furnace produces flue gas with a temperature of 1450°C, a flue gas flow rate of 230,000Nm³ / h, a pressure of 80kPa, and the flue gas contains 20% CO and a dust content of 20g / Nm³. First enter the flue type vaporization cooling device, the circulating water volume is 1200t / h, to recover the waste heat in the high temperature flue gas of the SRV furnace during smelting, and reduce the flue gas temperature to 750 ℃, the vaporization cooling flue adopts forced and natural convection circulation, The feed water is demineralized water. The exhaust gas from the vaporization cooling flue first enters the cyclone separator, and the large particle dust in the flue gas is settled in the cyclone dust collector, and the dust content of the flue is reduced to 5g / Nm³. After passing through the cyclone dust collector, it enters the convection heat exchange boiler and is sent to the outside for power generation...

Embodiment 2

[0021] like figure 1 As shown in the figure, during the normal production process, the SRV furnace produces flue gas with a temperature of 1500°C, a flue gas flow of 230,000Nm³ / h, a pressure of 80kPa, and the flue gas contains 20% CO and a dust content of 25g / Nm³. First enter the flue type vaporization cooling device, the circulating water volume is 1220t / h, to recover the waste heat in the high temperature flue gas of the SRV furnace during smelting, and reduce the flue gas temperature to 750 ℃, the vaporization cooling flue adopts forced and natural convection circulation, The feed water is demineralized water. The exhaust gas from the vaporization cooling flue first enters the cyclone separator, and the large particle dust in the flue gas is settled in the cyclone dust collector, and the dust content of the flue is reduced to 5g / Nm³. After passing through the cyclone dust collector, it enters the convection heat exchange boiler and is sent for power generation. The system ...

Embodiment 3

[0023] like figure 1 As shown in the figure, during the normal production process, the SRV furnace produces flue gas with a temperature of 1600°C, a flue gas flow of 230,000Nm³ / h, a pressure of 80kPa, and the flue gas contains 20% CO and a dust content of 30g / Nm³. First enter the flue-type vaporization cooling device, with a circulating water volume of 1250t / h, to recover the waste heat in the high-temperature flue gas of the SRV furnace during smelting, and reduce the flue gas temperature to 750 °C. The vaporization cooling flue adopts forced and natural convection circulation. The feed water is demineralized water. The exhaust gas from the vaporization cooling flue first enters the cyclone separator, and the large particle dust in the flue gas is settled in the cyclone dust collector, and the dust content of the flue is reduced to 5g / Nm³. After passing through the cyclone dust collector, it enters the convection heat exchange boiler and then sends out power generation. The ...

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Abstract

The invention relates to a furnace top gas treatment technology for a HIsmelt melting reduction furnace. According to the method, waste heat in high-temperature smoke of an SRV furnace during smeltingis recovered by utilizing a flue-type vaporization cooling device to decrease the temperature of exhaust smoke; and then through a cyclone separator, large-particle dust in the smoke is settled in acyclone dust collector and then enters a convection heat exchanging boiler, and the waste heat of the smoke is further utilized by utilizing a waste heat boiler. According to the novel smoke treatmenttechnology, compared with a traditional smoke treatment technology for the HIsmelt melting reduction furnace, a cyclone dust removal system and a waste heat boiler system are additionally arranged behind a vaporization cooling system, through the smoke treatment technology, on the one hand, the quantity of the dust in the furnace top smoke is reduced, the large part of furnace dust is discharged,and the dust removal burden of gas washing is greatly relieved; on the other hand, the irrecoverable waste heat in a flue is further recovered by the waste heat boiler, the temperature can be decreased from 800 DEG C or so at a flue outlet to 140-150 DEG C at a waste heat boiler outlet, the waste heat recovery efficiency is greatly improved, and energy efficient recycling is achieved; and meanwhile, the technology is efficient and feasible and has the advantages that operation is easy and convenient and operating is reliable, and the important technical support is provided for efficient and stable production of a HIsmelt technology.

Description

technical field [0001] The invention relates to the field of smelting reduction ironmaking, in particular to a process for treating top gas of a HIsmelt smelting reduction furnace. Background technique [0002] The HIsmelt smelting reduced iron process is a smelting method that uses non-coking coal as the main energy source, directly uses iron ore powder and other raw materials, and uses carbon to reduce iron oxides into metallic iron in a high-temperature molten state. This method does not use coke, sinter and pellets, which greatly reduces CO 2 , NO x The emission of dioxins and dioxins has the advantages of simple process, high utilization efficiency of resources and energy, and low environmental pollution. It has a very bright application prospect and has always been a research hotspot in the ironmaking industry. Compared with blast furnace ironmaking, the furnace top gas produced by HIsmelt smelting reduction process is between 1500 and 1700 °C, which has the characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00
CPCC21B13/0006C21B13/0073Y02P10/20
Inventor 张云三刘云龙张冠琪王振华张协兵
Owner SHANDONG MOLONG PETROLEUM MACHINERY
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