Oxygen jet multi-stage dispersion combustion roaster

A dispersion combustion and roaster technology, which is applied to gas fuel burners, burners, combustion methods, etc., can solve problems such as airflow short circuit, complex equipment structure, blockage and crushing of regenerators, etc., to reduce the temperature difference between the upper and lower sides and improve Baking efficiency, heat loss reduction effect

Pending Publication Date: 2021-06-11
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy-saving effect is good, but after a period of actual use, due to the complex structure of the equipment, the frequent reversing of the reversing valve, the high failure rate of the equipment, the frequent blockage and crushing of the heat storage body, and the large amount of maintenance. Paralyzed state, loss of heat storage function
Moreover, there are flames floating up and air flow short-circuiting, which makes it impossible to reach the bottom of the ladle, and the large temperature difference between the upper and lower sides of the ladle can easily cause steel sticking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A 100-ton ladle uses coke oven gas as fuel and uses an oxygen jet multi-stage diffuse combustion roaster. After the ladle is transported back from the continuous casting empty ladle, it needs to be baked. First, turn on the secondary combustion air and primary gas in the center. After the flame is stable, turn on the primary compressed air in the center, and finally turn on the secondary gas and the tertiary oxygen in the outer ring. After baking for 24 minutes, the temperature reaches 1080°C. After the baking is over, it is sent to the converter to wait for steel connection. Gas consumption from the original 585Nm 3 / h reduced to 320Nm 3 / h, the fuel saving rate is 45.3%.

Embodiment 2

[0028] A 200-ton ladle uses mixed gas as fuel and uses an oxygen jet multi-stage diffuse combustion roaster. After the ladle is transported back from the continuous casting empty ladle, it needs to be baked. First, the secondary combustion air and primary gas in the center are turned on. After baking for 38 minutes, it reaches 1109°C. After the baking is over, it is sent to the converter to wait for steel connection. Gas consumption from the original 1806Nm 3 / h reduced to 929m 3 / h, saving 48.6% of gas.

Embodiment 3

[0030] A 200-ton ladle uses converter gas as fuel and uses an oxygen jet multi-stage diffuse combustion roaster. After the ladle is transported back from the continuous casting empty ladle, it needs to be baked. First, the secondary combustion air and primary gas in the center are turned on. After baking for 32 minutes, it reaches 1077°C, and the baking is over, and it is sent to the converter to wait for steel connection. Gas consumption from the original 3679Nm 3 / h reduced to 1648m 3 / h, saving 55.2% of gas.

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Abstract

The invention relates to an oxygen jet multi-stage dispersion combustion roaster which comprises a metal structure burner and a refractory burner brick; the metal structure burner is arranged in the center of a ladle cover; the metal structure burner is of a four-layer sleeve structure; a first-stage compressed air channel is arranged in the center; a first-stage gas channel, a second-stage combustion-supporting air channel and a second-stage gas channel are sequentially arranged outside the first-stage compressed air channel; a compressed air nozzle is of a contracted conical structure and is arranged at the bottom of the first-stage compressed air channel; a first-stage gas circular seam is arranged at the bottom of the first-stage gas channel; a second-stage air circular seam is arranged at the bottom of the second-stage combustion-supporting air channel; a second-stage gas circular seam is arranged at the bottom of the second-stage gas channel; an oxygen jet orifice is fixed outside the metal structure burner; and a whole burner nozzle is fixed in the burner brick. The oxygen jet multi-stage dispersion combustion roaster has the advantages that oxygen high-speed jet is utilized to strengthen steel ladle bottom heating, upper and lower temperature difference of a steel ladle is reduced, and a local high-temperature area formed by high oxygen concentration is avoided.

Description

technical field [0001] The invention belongs to the field of oxygen-enriched and pure oxygen combustion, and in particular relates to an oxygen jet multi-stage diffuse combustion roaster. Background technique [0002] After the converter is tapped, the high-temperature liquid steel needs to be poured into the ladle, and it is operated for refining and continuous casting. Finally, the empty ladle is returned to the converter, waiting for the next batch of molten steel to be loaded. During the whole turnover process of the ladle containing molten steel, the lining refractory directly contacts the molten steel, absorbs part of the heat and stores it, the surface of the ladle wall dissipates heat to the atmosphere, and the surface of the molten steel dissipates heat, resulting in a decrease in the temperature of the molten steel. Especially during the returning process of the empty ladle in the continuous casting process and the process of waiting for the molten steel to be rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/48F23D14/64F23L7/00B22D41/015
CPCF23D14/48F23D14/64F23L7/007B22D41/015Y02E20/34
Inventor 贾丽娣柴蕴王东山赵爱华马光宇孙静李丛康
Owner ANGANG STEEL CO LTD
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