A once-through diffuse combustion tubular heating furnace system and burner

Abstract

The invention relates to a straight-flow type dispersion combustion tubular heating furnace system and a combustor. Fuel gas and preheated air are injected into a combustion chamber of a radiation chamber by a high-speed fuel gas combustor; the temperature of a hearth is higher than spontaneous ignition temperature; the injection speed is greater than the flame spreading speed during combustion of the fuel gas, so that visible luminous flame cannot be formed; reaction of combustion is performed in the whole radiation chamber; heat distributed in the radiation chamber is uniform; the maximum temperature of a combustion process is smaller than 1700K; and NOx is restrained effectively. A reflecting plate is arranged on a downstream portion of the radiation chamber, the circumstance that the fuel gas and the hot air are in a short-circuiting state in the radiation chamber and directly enter a convection chamber can be avoided, backflow is formed on a downstream portion of the reflecting plate, standing time of smoke in the convection chamber is prolonged, and combustible ingredients such as CO can be sufficiently burnt out. The straight-flow type dispersion combustion tubular heating furnace system has the advantages of high combustion efficiency, ultra-low pollutant emission, uniform temperature field and the like. Moreover, the straight-flow type dispersion combustion tubular heating furnace system is suitable for building a new tubular heating furnace or modifying an old tubular heating furnace.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of tubular heating furnaces in refining and chemical enterprises, in particular to a diffuse combustion tubular heating furnace and a burner thereof. [0003] 【Background technique】 [0004] Tube heating furnace is a process heating furnace commonly used in refining and chemical enterprises. In the combustion chamber surrounded by refractory materials, the heat released by fuel combustion heats the medium in the furnace tube to the required temperature to make it react or meet the requirements of subsequent processes. . The operation of the tubular heating furnace requires that the fuel is fully burned, the pollutants produced by the combustion are low, and the furnace tubes in the furnace are heated evenly, so as to realize the high efficiency, environmental protection, safety and long-term operation of the tubular heating furnace. [0005] At present, most of the tubular heating furnaces in refini...

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Problems solved by technology

However, on the one hand, the thermal efficiency of the tubular heating furnace is generally higher than 90% due to the extreme recovery of flue gas waste heat through the heat exchanger to preheat the air, and the potential for energy saving of the tubular heating furnace using new technologies is limited; on the other hand, the tubular heating furnace The furnace structure of the heating furnace is obviously different from the heating furnace in the metallurgy, metal processing, and ceramic industries. The existing high-temperature and low-oxygen combustion technology is not suitable for tubular heating furnaces: therefore, high-temperature and low-oxygen combustion technology has not yet been applied to tubular heating furnaces.

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