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Microwave-fuel combined heating-type coal-based direct reduction method and rotary hearth furnace

A combined heating and rotary hearth furnace technology, applied in the field of rotary hearth furnaces and coal-based direct reduction rotary hearth furnaces, can solve the impact of microwave device maintenance costs on production, operation and economics, investment can not be afforded by enterprises, and there is no Through any research and other issues, to achieve the effect of industrialization and market promotion and application, easy realization and promotion and application, and speeding up the gasification reaction speed

Active Publication Date: 2015-07-01
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that there are obviously many problems to be solved in the conventional rotary hearth furnace technology, otherwise it will face the danger of being eliminated.
[0008] 2) Another important problem in the conventional rotary hearth furnace technology is that even if the material 3 stays in the furnace for a long enough time to ensure a sufficiently high reduction rate of the metal oxides in the lower material 3, the flue gas from fuel combustion contains a lot of CO 2 The gas in the oxidizing atmosphere will oxidize the reduced metal in the upper material 3 again
The results show that the all-microwave method has very low energy efficiency when the furnace temperature is low, which will lead to higher production costs
[0012] 2) The investment cost of a rotary hearth furnace device with full microwave heating is dozens or even hundreds of times higher than that of a conventional fuel combustion heating rotary hearth furnace device, especially in today's high-power microwave heating device price In very expensive cases, the investment cannot be afforded by the business
Moreover, the service life and maintenance cost of microwave devices will have a great impact on production operation and economy, which is another reason why it is difficult to realize industrialization of microwave devices.
[0013] 3) The current all-microwave method is only a prototype, which only provides a concept, and there is no complete design that can match it and can be industrialized. Many technical problems, such as flue gas emission under microwave reduction, furnace pressure control, etc. There has never been any research

Method used

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  • Microwave-fuel combined heating-type coal-based direct reduction method and rotary hearth furnace
  • Microwave-fuel combined heating-type coal-based direct reduction method and rotary hearth furnace
  • Microwave-fuel combined heating-type coal-based direct reduction method and rotary hearth furnace

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Embodiment Construction

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Electromagnetic performance is the internal factor that reflects the coupling ability of materials and microwaves. The electromagnetic properties of materials determine the microwave heating characteristics of materials and are the foundation of whether materials can be heated by microwaves. Starting from the electromagnetic properties of the material itself, to study the ability of the material to absorb microwaves, the main factors to be investigated are the complex permittivity of the material (the real part of the permittivity ε′ r and the imaginary part ε″ r ), because in the microwave electromagnetic field, the main factor affecting the temperature rise of the material is the dielectric loss. However, the electromagnetic properties of materials will also change greatly with changes in temperature, phase and structure. L...

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Abstract

The invention discloses a microwave-fuel combined heating-type coal-based direct reduction method and a rotary hearth furnace. The method comprises the following steps of drying and pre-heating materials, reducing the materials by a fuel combustion method, and further reducing the materials by a microwave radiation method, wherein a reducer for reducing the metal oxide into metal is fixed carbon in the materials. The rotary hearth furnace is used by the above method. The rotary hearth furnace has the advantages of simple structure, low cost, high metallization rate, and realization and popularization easiness.

Description

technical field [0001] The invention mainly relates to the field of coal-based direct reduction rotary hearth furnaces, in particular to a coal-based direct reduction method using fuel and microwave combined heating with microwave fuel and a rotary hearth furnace based on the method. Background technique [0002] Coal-based direct reduction rotary hearth furnace technology uses coal as a reducing agent to reduce metal oxides in ore materials to metals under non-reflow conditions. This method does not rely on coking coal resources, and compared with traditional steel production processes, it can greatly reduce pollutant emissions, and its products can replace scrap steel as raw materials for smelting high-quality steel in electric furnaces. Therefore, the market prospect of this process is broad, and it is one of the main directions for the development of iron and steel smelting in the future. [0003] Common methods of direct reduction production include gas-based shaft fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/10
Inventor 贺新华胡兵王兆才孙英储太山向锡炎
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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