Fuel gas graded and segmented distribution combustion device and fuel gas graded and segmented distribution method thereof

Abstract

The invention relates to a fuel gas graded and segmented distribution combustion device. The fuel gas graded and segmented distribution combustion device can be matched with various boiler furnaces, and the purpose of ultra-low NOx emission is realized. The fuel gas graded and segmented distribution combustion device belongs to the technical field of emission reduction of industrial boilers and is characterized in that an outer fuel gas gun fixing plate perpendicular to the central axis is arranged between the end of the outer edge of a throat and the end of an inner annular barrel; a gun head of an outer fuel gas gun penetrates through and is exposed out of the outer fuel gas gun fixing plate; a combustion air passage is arranged between the inner annular barrel and an outer annular barrel; and the outer wall of the outer annular barrel is attached to and connected with the inner wall of a refractory material layer. The fuel gas graded and segmented distribution combustion device has the positive effects that a novel gas and air graded and segmented distribution method is provided, and the outer fuel gas gun is arranged on the outer side of the throat, so that the space of the boiler furnace is used to the maximum extent, and the average temperature and peak temperature of flame are lowered; and the outer-layer combustion air passage is arranged, overall dense-lean combustion of a combustor area is formed, and the generation of NOx is further reduced, so that ultra-low NOx emission smaller than 30 mg / Nm<3> is realized, and no CO is generated.

Description

technical field [0001] The present invention relates to a combustion device with staged and segmented configuration of gas, in particular to a method for configuring gas and air in stages and segments of a high calorific value gas combustion device. x The invention aims at ultra-low emission and belongs to the technical field of emission reduction of industrial boilers. Background technique [0002] In order to control severe environmental pollution and smog weather, Beijing will implement the most stringent air pollution emission standards in 2017, and the NOx emission reduction of newly built gas-fired boilers must be reduced to 30mg / Nm 3 the following. With the traditional burner structure, it is difficult to reach 30mg / Nm only by using low-nitrogen combustion method 3 ultra-low emissions. In order to reduce the denitrification cost of gas-fired boilers, the implementation of the most stringent emission standards in Beijing will definitely bring about technological i...

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Problems solved by technology

[0003] Today, natural gas low-emission burners adopt no more than two technical routes: one is the premixed metal surface burner, that is, a cylindrical metal tube is connected to the throat outlet of the burner, and there are countless millimeter-scale small holes on the tube. However, natural gas and air are mixed in the cylinder, and the mixed gas is burned outside the cylinder. Due to the premixing of gas and air, flashback or even deflagration is easy to occur, and the safety is not good; now the diffusion type low-nitrogen burner ( Non-premixed) plus flue gas recirculation technology is mostly, but because the low-nitrogen effect of the burner body is insufficient, there are problems such as the large amount of flue gas required to effectively reduce NOx, and once the flue gas amount is large , the burner system is prone to vibration

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