Hollow flame low-nitrogen burner

Abstract

The invention provides a hollow flame low-nitrogen burner which comprises a castable table, an inner gas air channel, an inner gas channel, an inner gas nozzle, a castable table first smoke channel, a castable table second smoke channel, an outer gas and smoke mixing channel and an outer gas channel. An air channel is formed in the inner side of the castable table. The inner gas air channel is positioned between the air channel and the castable table. The inner gas channel extends into the inner gas air channel from the first surface. The inner gas nozzle is located at the end, extending into the inner gas air channel, of the inner gas channel. The castable table first smoke channel is positioned in the castable table. The castable table second smoke channel is positioned in the castable table. The outer gas and smoke mixing channel is located on the outer side of the castable table. And the outer gas channel is located on the outer side of the castable table and extends into the outer gas and smoke mixing channel from one side of the first surface of the castable table. The castable table has a heat storage function so that the fuel can be stably combusted under the condition that the oxygen content is 0-3%. Due to the special design, no flame is generated in the center of the burner, the low-nitrogen combustion technologies such as premixed combustion, smoke internal circulation and staged combustion are combined, and the effect and stability of low-oxygen combustion are guaranteed.

Description

technical field [0001] The invention relates to the field of boiler and industrial furnace emission reduction, in particular to a hollow flame low-nitrogen burner. Background technique [0002] At present, the nitrogen reduction method commonly used in gas-fired industrial furnaces is low-nitrogen burner plus flue gas external circulation. For boilers burning clean fuels such as natural gas with high calorific value, this nitrogen reduction method can reduce the nitrogen oxide emissions of boilers within Below 30mg / Nm3. At present, most of the low-nitrogen burners on the market use technical methods such as multi-stage combustion and thick-lean combustion to realize nitrogen-reducing combustion; the external circulation of flue gas is to extract a certain proportion of flue gas from the tail of the furnace and then pass it into the combustion chamber through the flue gas circulation pipe. The air inlet of the device is mixed with the combustion-supporting air to participate...

AI Technical Summary

Problems solved by technology

[0003] However, the application of flue gas external circulation has many disadvantages, for example, condensed water will appear in the backflow of flue gas, and the external circulation flue gas mixed into the combustion air will easily cause vibration, etc.

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