Low nitrogen combustion device and low nitrogen combustion method

Abstract

The invention relates to equipment for low-nitrogen combustion and a method for low-nitrogen combustion. The equipment for low-nitrogen combustion comprises a device for ignition, a device for flame detection, a natural gas pipeline, a flue gas pipe, a dilution pipe for natural gas, a combustion air room, and a guiding pipe for combustion air which is inserted into and connected with the combustion air room and a fire spraying pipe. The exit end of the natural gas pipeline is inserted inside the dilution pipe for natural gas from the entry end of the dilution pipe for natural gas. The flue gas pipe connects with the dilution pipe for natural gas through inner walls of the dilution pipe for natural gas, and the exit end of the dilution pipe for natural gas is inserted into the combustion air room and further inserted inside the guiding pipe for combustion air from the entry end of the guiding pipe for combustion air inside the combustion air room. The equipment for low-nitrogen combustion adopts a way of mixing natural gas with flue gas and blending the two gases inside the dilution pipe for natural gas in order to dilute the natural gas, thereby lowering calorific value of the natural gas, reducing the flame temperature, lowering the synthesis of nitric oxide fundamentally and realizing the effect of low-nitrogen combustion.

Description

technical field [0001] The invention relates to a low-nitrogen combustion device and a low-nitrogen combustion method. Background technique [0002] At present, most combustion devices and combustion methods use the flue gas recirculation method to recycle the flue gas. Usually, a part of the low-temperature flue gas is extracted and sent directly into the furnace, or mixed with primary air or secondary air and then sent into the furnace. For example, in a boiler that uses natural gas as fuel, the flue gas released from the boiler is directly mixed with air to reduce the density of oxygen in the combustion-supporting air, and the mixed gas is used as a combustion-supporting gas to mix with natural gas in the boiler, thereby burning natural gas. [0003] When this method is used, although the generation of nitrogen oxides in the combustion device can be reduced to a certain extent, it cannot fundamentally inhibit the synthesis of nitrogen oxides. First of all, a part of the ...

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Problems solved by technology

[0003] When using this method, although the generation of nitrogen oxides in the combustion device can be reduced to a certain extent, it cannot fundamentally inhibit the synthesis of nitrogen oxides

First of all, a part of the low-temperature flue gas is extracted and sent directly into the furnace. The flow rate of the combustion air in the furnace is small, and the problem of incomplete combustion will occur.

Secondly, the flue gas is directly mixed into the air, which requires a large amount of flue gas and a large area of ​​the natural gas dilution pipeline

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