A method for gas upgrading in scrap steel preheating system

A technology for coal gas and scrap steel, applied in the field of metallurgy, can solve the problems of increasing enterprise equipment investment, long-term maintenance costs, inability to be widely used in terms of practicability and economy, and increasing the burden on the gas dust removal system, so as to shorten the smelting cycle and improve the enterprise Economic benefits, the effect of shortening the steelmaking cycle

Active Publication Date: 2020-11-03
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention uses the principle of copper and oxygen to generate copper oxide to consume oxygen. Although the principle is simple, the enterprise needs to add additional equipment, and the copper-plated stainless steel ball is a one-time consumable, which needs to be replaced frequently to ensure the deoxidation effect. Therefore, from the perspective of practicability and From an economic point of view, it is obviously not widely used
In order to increase the CO content in the gas, the Chinese Patent Publication No. CN 204385230 U discloses a device for increasing the carbon monoxide content in the recovered gas from the converter. It adopts the method of injecting coal powder above the converter to increase the CO content in the gas, but the coal The contact time between pulverized coal and converter gas is too short, and the temperature of pulverized coal has not reached CO 2 (g)+C(s)=2CO(g) reaction temperature, so the reaction is not sufficient and the improvement effect is not good
In addition, when the pulverized coal is directly injected to the outlet of the converter fume hood, part of the pulverized coal particles will be taken away during the rising process of the converter flue gas, and some of these particles will be deposited in the flue, affecting the exhaust effect of the flue. Will increase the burden on the gas dust removal system
The Chinese Patent Publication No. CN 102311812 A discloses a device and method for cooling and upgrading converter gas. It uses a carbon-based packed bed to increase the concentration of CO, and at the same time adds water vapor for cooling treatment. This method can realize the composition of converter gas. Upgrading, cooling and purification of converter gas, but this gas upgrading method will increase the equipment investment and long-term maintenance costs of the enterprise, and the use of water vapor cooling treatment will cause waste of gas physical heat

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  • A method for gas upgrading in scrap steel preheating system
  • A method for gas upgrading in scrap steel preheating system
  • A method for gas upgrading in scrap steel preheating system

Examples

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Embodiment 1

[0040] A method for gas upgrading in a converter scrap steel preheating system, such asfigure 1 As shown, the high-temperature gas generated by the converter 1 during the steelmaking process is recovered through the converter flue gas hood 2 , and the high-temperature gas is used to preheat scrap steel and charge 4 in the scrap heating furnace 3 . The 1500-1700°C high-temperature gas produced in the converter 1 steelmaking process contains 58% CO, 28% CO 2 , and 2% O 2 , and the rest are N 2 、H 2 , the amount of coke is added according to 0.1% of the mass of scrap steel, and the amount of limestone is added according to 5% of the total mass of steelmaking. Coke and limestone are evenly mixed in scrap steel, and added to scrap steel heating furnace 3 for preheating. When the recovered high-temperature gas When the temperature is very high, that is, around 708°C, CO can occur 2 (g)+C(s)=2CO(g), CO in gas 2 Converted to CO, when the limestone starts to decompose at 838°C afte...

Embodiment 2

[0044] On the basis of Example 1, this embodiment adopts the high-temperature coal gas produced by electric furnace 9 to preheat scrap steel, as figure 2 As shown, the 1500-1700°C high-temperature gas produced during the steelmaking process of the electric furnace 9 contains 31% CO, 18% CO 2 , and 13% O 2 , and the rest are N 2 、H 2 , add electrode powder according to 1% of the total mass of scrap steel, and add limestone according to 7% of the total mass of steelmaking, and finally increase the concentration of CO to 72%, and reduce the concentration of oxygen to 0.6%.

Embodiment 3

[0046] This embodiment is a gas upgrading method in the electric furnace scrap steel preheating system, which adopts continuous production, such as image 3 As shown, the high-temperature flue gas produced by the electric furnace 9 in the steelmaking process, that is, the electric furnace gas, is directly used to preheat the scrap steel and the charge 4, and an inlet for adding scrap steel is provided at the upper end of the side of the electric furnace 9, through which the electric furnace 9 itself generates The electric furnace gas preheats the steel scrap and charge 4 entering the electric furnace, and after preheating, the steel scrap and charge enter the electric furnace for smelting. Electric furnace gas generated at the beginning contained 28% CO, 22% CO 2 , and 5% O 2 , and the rest are N 2 、H 2 , coke powder is added at 1.2% of steel scrap, the particle size of coke powder is 3-40mm, dolomite is added at 3% of steelmaking quality, limestone is added at 5% of steelm...

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Abstract

The invention relates to a method for modifying the quality of coal gas in a steel scrap preheating system. Aiming at O2 and CO2-containing high-temperature coal gas used in the steel scrap preheatingsystem, a carbon-containing material A and a carbon-containing material B are mixed into to-be-preheated steel scrap, and an induction heating device is additionally arranged in the steel scrap preheating system. According to the method, the steel scrap preheating temperature can be increased, the scrap ratio of a converter can be increased, and the smelting period of an electric furnace can be shortened; by introducing carbonate into the steel scrap, the content of CO in the coal gas can be increased, and a product can be used as a slag former for replacing partial relatively-expensive furnace burdens, so that the production cost is lowered; and by utilizing the coal gas quality modifying method, the emission of unqualified coal gas can be reduced or even stopped, the environmental pollution is alleviated, the heat value of the coal gas is increased, the recycling amount of the coal gas is increased, and the economic benefit of an enterprise is increased.

Description

technical field [0001] The invention relates to a method for gas upgrading in a steel scrap preheating system, belonging to the technical field of metallurgy. Background technique [0002] At present, steelmaking methods in various countries in the world are mainly based on converter steelmaking and electric furnace steelmaking. During the steelmaking process, both converters and electric furnaces will produce a large amount of high-temperature gas. Recycling is an important part of energy saving and emission reduction. [0003] At present, high-temperature gas is mainly recycled by means of preheating scrap steel and collecting gas. The main components of the high-temperature gas produced by the steelmaking furnace are a large amount of CO produced during the decarburization process, CO 2 , part of the unreacted O blown in during the smelting process 2 , and a small amount of N 2 Wait. In the process of scrap steel preheating, the coal gas / flue gas is often directly pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/56C10K3/00
CPCC10K3/00C10K3/001Y02P10/20
Inventor 战东平葛启桢邱国兴杨永坤屈乐欣孟沈童刘志明康旭姜周华李长生
Owner NORTHEASTERN UNIV LIAONING
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