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Radiant tube heating device with self-preheating type flue gas recirculation

A radiant tube heating and flue gas circulation technology, applied in lighting and heating equipment, gas fuel burners, combustion methods, etc., can solve the problems of high local temperature, large temperature gradient of radiant tube, uneven temperature distribution of tube wall, etc. Achieve the effect of increasing flow rate, improving uniformity, and reducing the generation of thermal nitrogen oxides

Pending Publication Date: 2022-02-25
BAOSHAN IRON & STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of large temperature gradient in the radiant tube, uneven temperature distribution on the tube wall and excessive local temperature in the existing technology

Method used

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  • Radiant tube heating device with self-preheating type flue gas recirculation
  • Radiant tube heating device with self-preheating type flue gas recirculation
  • Radiant tube heating device with self-preheating type flue gas recirculation

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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] see Figure 1-3 , the radiant tube heating device with self-preheating flue gas circulation of the present invention includes a burner 1, one end of the burner 1 is connected with a directional radiant tube, and one end of the directional radiant tube is connected with a flue gas circulation pipe;

[0024] The directional radiation tube includes a first straight tube 2, one end of the first straight tube 2 is fixedly connected with a first bent tube 3, ...

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Abstract

The invention discloses a radiant tube heating device with self-preheating type flue gas recirculation. The device comprises a radiant tube main body device, a combustion-supporting air preheating pipeline, a contraction opening and a formed flue gas circulation pipeline. In order to enhance heat exchange between flue gas and combustion-supporting air, a non-smooth air preheating pipeline is arranged at the tail part of the radiation pipe, so that the problems of high exhaust gas temperature and low heat efficiency of the device are solved; the gas circulation pipeline can enable a certain amount of flue gas to flow back to a combustion chamber to participate in re-combustion; the oxygen content of a combustion area is reduced by the backflow flue gas, so that the flame temperature is reduced, the stress concentration of the radiant tube is relieved while the generation of NOx is reduced, and the service life of the radiant tube is prolonged; the average flow rate of flue gas in the radiant tube is improved through jet flow generated by the shrinkage opening, so that the temperature gradient in the radiant tube is reduced, and the temperature distribution uniformity of the radiant tube is enhanced.

Description

technical field [0001] The invention relates to heating of gas radiant tubes, in particular to a radiant tube heating device with self-preheating flue gas circulation. Background technique [0002] The combustion atmosphere and combustion products of the gas radiant tube are not in direct contact with the heated workpiece, which can make the heated device have good performance. At the same time, the gas radiant tube also has the advantages of high energy utilization rate, low thermal power per unit surface area, and low operating cost. Therefore, it is widely used in the fields of metal heat treatment and industrial drying. [0003] However, the gas radiant tube heating device also has many deficiencies. One is that the combustion temperature of the gas radiant tube in the flame zone is very high, resulting in a high temperature of the wall surface of the radiant tube in front of the gas burner. However, the temperature of the flue gas after the flame is low, so that the ...

Claims

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Application Information

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IPC IPC(8): F23D14/12F23L15/00F23D14/66F23D14/62
CPCF23D14/12F23L15/00F23D14/66F23D14/62Y02E20/34
Inventor 李咸伟王恩禄胡子国王奇刘道清俞勇梅
Owner BAOSHAN IRON & STEEL CO LTD
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