Two-end type radiant tube staged combustion device and using method

Abstract

The invention discloses a two-end type radiant tube staged combustion device and a using method. The two-end type radiant tube staged combustion device comprises a U-shaped radiant tube, an air inlet hole is formed in the air end of the radiant tube, an air supply pipe is arranged outside the air inlet hole, and a gas pipe hole is formed in the gas end of the radiant tube; a heat exchanger and a fluid director are arranged in the air end of the radiant tube in a separated mode, the heat exchanger is communicated with the air inlet hole, a gas supply pipe is installed on the gas pipe hole, part of the end of the gas supply pipe extends into the radiant tube, and an outlet of the gas supply pipe is sleeved with an air distributor; a smoke exhaust pipe is installed on the outer wall of the air end of the radiant tube, and an air connecting pipe is arranged between the air end and the gas end of the radiant tube; and the air connecting pipe extends into the air end of the radiant tube and is connected with the heat exchanger. According to the device, all reaction areas are adjusted to be in fuel-rich combustion so that the local high temperature of a flame area can be reduced, and meanwhile, a large amount of CO is generated to reduce NOx, so that the generation amount of NOx is greatly reduced.

Description

technical field [0001] The invention relates to the field of metallurgical energy, in particular to a two-end radiant tube staged combustion device and a method for using it. Background technique [0002] The working mode of the radiant tube is: gas and a certain proportion of air enter the burner and spray out mixed combustion, and the high-temperature flue gas generated by the combustion advances in the space inside the radiant tube. During this process, the high-temperature flue gas heats the radiant tube, and the temperature of the flue gas gradually increases. Descend, and after reaching the tail, exchange heat with the air in the heat exchanger to cool down, and then discharge into the atmosphere through the exhaust pipe and exhaust fan. Usually three conditions must be met: [0003] One is to burn fully and completely, [0004] The second is that the combustion process cannot produce too much NOx, [0005] The third is that the temperature of the radiant tube shoul...

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to overcome the deficiencies of the prior art, and provide a two-end radiant tube staged combustion device and its use method. The staged combustion device has complete combustion, NO x It has the characteristics of low production amount and high temperature uniformity. It solves the problems existing in the existing radiant tube burner mainly as follows:

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