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Combustion device with low NOx combustion

A combustion device and burner technology, applied in the direction of burner, combustion method, combustion type, etc., can solve the problems of insufficient fuel, unstable combustion, increased heat loss, etc., to speed up convection, suppress thermal NOx, Effect of reducing NOx emissions

Pending Publication Date: 2022-03-25
SHANGHAI INDAL BOILER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the flue gas recirculation rate is too high, there will be too much flue gas, and the fuel will not get enough oxygen, resulting in unstable combustion or incomplete combustion, resulting in increased heat loss

Method used

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  • Combustion device with low NOx combustion
  • Combustion device with low NOx combustion
  • Combustion device with low NOx combustion

Examples

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Embodiment Construction

[0040] In order to better understand the technical solutions of the present invention, specific examples are given below for detailed description.

[0041] see figure 1 . A low NOx combustion combustion device of the present invention includes: a burner 21 and a flue gas recirculation system connected to the burner 21 .

[0042] Taking the gas boiler as an example, the burner 21 is installed in the combustion chamber of the boiler to provide thermal energy to the boiler through flame combustion, and heat the cold water in the boiler to hot water or further provide steam.

[0043]The flue gas recirculation system is used to provide the combustor 21 with a mixture of premixed recirculated flue gas and air, so as to realize low NOx combustion and low nitrogen emission of the combustor 21 .

[0044] see figure 1 . The flue gas recirculation system is provided with a flue gas premixing chamber 10 . The flue gas premixing chamber 10 is provided with a first air inlet, a secon...

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Abstract

The invention discloses a low-NOx combustion device which comprises a flue gas recirculation system for providing mixed gas of premixed recirculation flue gas and air for a combustor, the flue gas recirculation system is provided with a flue gas premixing cavity, and the flue gas premixing cavity is provided with a first gas inlet and a second gas inlet which are used for leading in the recirculation flue gas and preheated air respectively. The gas outlet is used for guiding mixed gas formed by premixing to the combustor, the air mixing mechanism is used for premixing the introduced recycled flue gas and air to form uniform mixed gas, and the uniform mixed gas is formed by controlling different proportions of the flue gas flow of the first gas inlet, the air flow of the second gas inlet and the mixed gas flow of the gas outlet. By controlling the temperature of the introduced air, the nitrogen content and the oxygen content in the exported mixed gas are controlled, and the low NOx combustion temperature of the combustor is compensated by controlling the temperature of the introduced air, so that the purpose of remarkably reducing the emission of nitrogen oxides is achieved.

Description

technical field [0001] The invention relates to the technical field of thermal engineering, in particular to a combustion device for low NOx combustion. Background technique [0002] In recent years, the country has become more and more stringent on the NOx (nitrogen oxides) emission requirements of gas-fired boilers. For example, the emission standard is changed from the original requirement of 400mg / m 3 to 150mg / m 3 , to 80mg / m 3 . Even some cities and regions directly limit the standard to no more than 30mg / m 3 It only takes 2 to 3 years to change the whole standard. This shows that the country's urgent requirements for low-nitrogen emissions from gas-fired boilers have led to the emergence of boilers that meet low-nitrogen emissions. [0003] The essence of flue gas recirculation technology is to reintroduce the flue gas produced by boiler combustion into the combustion area of ​​the burner to realize the control of combustion temperature and oxide concentration, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/02F23D14/62F23D14/46F23D14/70F23D14/60
CPCF23D14/02F23D14/62F23D14/46F23D14/70F23D14/60Y02E20/34
Inventor 张艳伟汪杰王育峰叶科尼李梦娜朱雅雯
Owner SHANGHAI INDAL BOILER RES INST
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