Waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion and heating method thereof

Abstract

The invention discloses a waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion and a heating method of the waste heat recovery steel rolling heating furnace, and belongs to the technical field of metallurgical heat energy engineering. The steel rolling heating furnace comprises a preheating section, a plurality of heating sections, a soaking section, an oxygen main pipe, a smoke main pipe, a fuel main pipe and a water vapor adjusting device, the heating sections comprise the first heating section, the second heating section,... and the n heating section, and the oxygen main pipe, the smoke main pipe and the fuel main pipe are connected with the preheating section, the heating sections and the soaking section correspondingly. And the water vapor adjusting device is arranged on the flue gas main pipe. MILD oxygen-enriched combustion is achieved through heating furnace transformation, the side-burning oxygen-blowing staged combustion mode is adopted, the oxygen matching amount is flexibly adjusted, the oxygen-enriched combustion technology and soft combustion are combined and applied to the steel rolling heating furnace, the advantages of energy conservation and emission reduction of the oxygen-enriched combustion technology can be fully played, and the defects of the oxygen-enriched combustion technology can be overcome. And the generation concentration of nitric oxide in the billet heating process and the oxidation burn-out rate of the heated billet are greatly reduced.

Description

Technical field: [0001] The invention belongs to the technical field of metallurgical thermal energy engineering, and in particular relates to a waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion and a heating method thereof. Background technique: [0002] The steel rolling heating furnace is the equipment with the highest energy consumption in the steel rolling process, and its energy consumption accounts for about 65% of the total steel rolling energy consumption. At the same time, during the operation of the steel rolling heating furnace, a large amount of NO will be discharged. x and other pollutants. Therefore, reducing the energy consumption of the heating furnace and reducing the emission of pollutants is the focus of energy saving and emission reduction in the steel rolling process. [0003] Conventional combustion techniques typically use air as a combustion accelerant. Air contains 21% oxygen and 79% nitrogen. Among them,...

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Problems solved by technology

[0004] The current research mainly focuses on the oxygen-enriched combustion technology. The patent CN 111964468 A designs a premixed oxygen-enriched combustion system for heating furnaces. Although it can achieve the purpose of increasing production capacity, saving fuel, reducing emissions and reducing investment costs to a certain extent, However, in the industrial application of oxy-combustion technology using flue gas recirculation on industrial furnaces, due to problems such as poor sealing, there is still a small amount of N in the furnace. 2 infiltration

Due to the use of pure oxygen and flue gas dilution, oxygen-enriched combustion has problems such as uneven temperature distribution and poor flame stability.

At the same time, the oxygen-enriched combustion method has a high safety risk

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