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Oxygen-enriched combustion system for heating furnace and control method thereof

An oxygen-enriched combustion and combustion system technology, applied in the direction of combustion method, burner, combustion type, etc., can solve the problems of poor uniformity of furnace temperature distribution, shortened flame, and accelerated combustion rate, etc.

Active Publication Date: 2021-08-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems such as accelerated combustion rate, shortened flame, more concentrated combustion area, and poor uniformity of furnace temperature distribution.

Method used

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  • Oxygen-enriched combustion system for heating furnace and control method thereof
  • Oxygen-enriched combustion system for heating furnace and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0049] In this example, the existing hot-rolling heating furnace is technically transformed. The actual hot-charging heating capacity of the heating furnace is 280.8t / h, and the heat value used in the original process is 2100cal / Nm 3 The mixed gas is used as the fuel, and the air is used as the combustion-supporting air to mix and burn with the gas.

[0050] In this embodiment, the production capacity of the heating furnace is increased by 15% on the original basis, an oxygen enrichment concentration control system is added, and it is connected with the combustion system of a heating section.

[0051] After implementation, the gas flow rate is 15500Nm 3 / h, the oxygen concentration in the first heating section is controlled by 50%, and the required air volume is changed from the original 34100Nm 3 / h reduced to 9067Nm 3 / h, the air flow rate is reduced by 73.4%, and the oxygen flow rate for the oxygen lance is 5257Nm 3 / h.

[0052] The unit gas consumption of the original ...

Embodiment 3

[0054] In this example, the existing hot-rolling heating furnace is technically transformed. The actual hot-charging heating capacity of the heating furnace is 280.8t / h, and the heat value used in the original process is 2100cal / Nm 3 The mixed gas is used as the fuel, and the air is used as the combustion-supporting air to mix and burn with the gas.

[0055] In this embodiment, the production capacity of the heating furnace is increased by 25% on the original basis, an oxygen-enriched concentration control system is added, and it is connected to the combustion systems of the first heating section and the second heating section at the same time.

[0056] After implementation, the gas flow rate is 24800Nm 3 / h, the oxygen concentration of the first heating section and the second heating section are both controlled at 55%, and the required air volume is changed from the original 54560Nm 3 / h reduced to 11866Nm 3 / h, the air flow rate is reduced by 78.3%, and the oxygen flow rat...

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Abstract

The invention relates to an oxygen-enriched combustion system of a heating furnace and a control method thereof. The heating furnace is provided with a preheating section, a heating section, a second heating section and a soaking section, wherein a heating section is provided with a combustion system, and the second heating section is provided with a combustion system 2. Combustion system 1 and combustion system 2 are respectively composed of multiple burners and oxygen lances located on both sides of the furnace. The oxygen-enriched combustion system of the heating furnace also includes a control system for controlling combustion system 1 or simultaneously controlling combustion system 1 and combustion system 2. The oxygen-enriched concentration control system is composed of a furnace temperature detection module, a burner load calculation module, a gas volume control module and an oxygen concentration control module; the invention combines the original combustion system of the heating furnace with the oxygen-enriched combustion technology. Combined, high-speed oxygen is injected through the oxygen lance to form flameless combustion in the furnace, which can effectively improve the combustion efficiency of the heating furnace, reduce fuel consumption, optimize the temperature field distribution in the furnace and the uniformity of billet temperature, and reduce NOx emissions.

Description

technical field [0001] The invention relates to the technical field of energy saving of metallurgical heating furnaces, in particular to an oxygen-enriched combustion system of a heating furnace and a control method thereof. Background technique [0002] Oxygen-enriched combustion technology has high conduction efficiency and combustion efficiency in the heating furnace field, which can effectively increase the production capacity of the heating furnace, improve the temperature field in the furnace, improve the temperature uniformity of the billet, reduce iron oxide scale, save fuel, and reduce NOx and C0 2 Emissions and other advantages, the application prospects are very broad. [0003] At present, there are several methods of oxygen-enriched combustion in steel rolling heating furnaces: air and oxygen are pre-mixed and then supplied to the burner for combustion, oxygen-inserted oxygen-enriched combustion, pure oxygen-enriched combustion, and flue gas backflow oxygen-enric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23D14/60F23L7/00F23N1/02
CPCF23D14/60F23L7/007F23N1/02Y02E20/34
Inventor 高军刘常鹏马光宇王向锋郝博徐伟赵俣张哲
Owner ANGANG STEEL CO LTD