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Method for heating molten steel

A molten steel and microwave heating technology, which is applied in the field of heating molten steel, can solve the problems of low energy utilization rate, difficult control, slow heating, etc., and achieve the effect of fast heating rate, adjustable heating rate and low energy consumption

Active Publication Date: 2016-07-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technology has disadvantages such as slow heating, high energy consumption, pollution, difficult control and low energy utilization rate.

Method used

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  • Method for heating molten steel
  • Method for heating molten steel
  • Method for heating molten steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The transmitting power of the microwave generator is set to 1kW, the microwave frequency is 2.45GHZ, the mass of molten steel in the crucible is 750g, and the initial temperature of molten steel is 1480°C. Start the microwave generator to start heating treatment. It takes 410s to raise the temperature to 1600°C, with an average heating rate of 17.82°C / min. When the temperature rises, the ratio of the microwave emission power of the microwave generator to the mass of the molten steel is 1.33kW / kg; Compared with conventional gas or resistance heating methods, this method has fast heating speed and low energy consumption; when heat preservation treatment is carried out, the microwave power is reduced; The ratio of the mass of molten steel is 0.6kW / kg, heat preservation for 5 minutes; after the heat preservation is completed, turn off the microwave. For molten steel heating curve, see figure 1 .

[0042] Considering the standardization of microwave devices and equipment, ...

Embodiment 2

[0046]The transmitting power of the microwave generator is set to 2kW, the microwave frequency is 2.45GHZ, the mass of the molten steel in the crucible is 750g, and the initial temperature of the molten steel is 1480°C. Start the microwave generator to start heating treatment, and it takes 250s to raise the temperature to 1600°C, with an average heating rate of 28.8°C / min. When the temperature rises, the ratio of the microwave emission power of the microwave generator to the mass of the molten steel is 2.67kW / kg; Compared with conventional gas or resistance heating methods, this method has fast heating speed and low energy consumption; when heat preservation treatment is carried out, the microwave power is reduced; The ratio of the mass of molten steel is 0.6kW / kg, heat preservation for 5 minutes; after the heat preservation is completed, turn off the microwave. For molten steel heating curve, see figure 1 .

[0047] In this example, the quality of the heated molten steel is...

Embodiment 3

[0049] The transmitting power of the microwave generator is set to 3kW, the microwave frequency is 2.45GHZ, the mass of the molten steel in the crucible is 750g, and the initial temperature of the molten steel is 1480°C. Start the microwave generator to start the heating treatment, and it takes 200s to raise the temperature to 1600°C, with an average heating rate of 36.6°C / min. When the temperature rises, the ratio of the microwave emission power of the microwave generator to the mass of the molten steel is 4kW / kg; Conventional gas or resistance heating method, the heating speed of this method is fast, and energy consumption is low; When carrying out heat preservation treatment, reduce microwave power, during heat preservation, control the microwave emission power of microwave generator to be 0.45kW, the microwave emission power of microwave generator and described The mass ratio of molten steel is 0.6kW / kg, and keep warm for 5 minutes; after the heat preservation is over, turn...

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Abstract

The invention mainly belongs to the technical field of steel production and particularly relates to a method for heating molten steel. According to the method, a microwave generator is adopted to generate microwaves, and the molten steel is heated by the microwaves. The temperature raising speed of the molten steel is controlled by adjusting the emission power of the microwave generator. When the temperature of the molten steel is raised to target temperature, the temperature of the molten steel can be preserved by reducing the emission power of the microwave generator. After temperature preservation ends, the microwave generator is shut down to stop heating. Microwave heating is used in the method, and compared with other molten steel heating modes, the method has the advantages of being high in heating speed, adjustable in heating speed, low in cost, capable of reducing energy consumption and the like.

Description

technical field [0001] The invention mainly belongs to the technical field of iron and steel production, and in particular relates to a method for heating molten steel. Background technique [0002] After the converter or electric furnace taps steel, in the process of molten steel turnover, including after the converter or electric furnace taps steel to the refining process, refining to continuous casting process, continuous casting pouring process, etc., it is inevitable to lose a certain amount of heat, resulting in molten steel A certain temperature drop occurs. In order to make up for this part of heat loss and ensure the temperature of the next process, the molten steel needs to be heated. [0003] The technologies for heating molten steel in the prior art include: using gas and high-efficiency burners to heat molten steel, adopting plasma heating technology to heat molten steel, adopting electromagnetic induction heating technology to heat molten steel, adding The tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00B22D11/11B22D11/116
CPCB22D11/11B22D11/116C21C7/00
Inventor 刘建华刘建吴博威
Owner UNIV OF SCI & TECH BEIJING
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