Gas mixing device of burner

Abstract

Disclosed is a gas mixing device of a burner. The gas mixing device of the burner comprises a gas mixing cavity, wherein a burner fan and a metal fiber burner head are communicated through the gas mixing cavity, and a fuel gas outlet assembly is arranged in an air outlet, connected with the burner fan, of the gas mixing cavity. The fuel gas outlet assembly comprises a fuel gas outlet pipe and a baffle, wherein the fuel gas outlet pipe is arranged in the air outlet and is communicated with a fuel gas inlet connector of the burner, and the baffle stretches into the gas mixing cavity from the air outlet of the burner fan through the fuel gas outlet pipe. According to the invention, the length of a non-combustion area of the burner head is effectively reduced, uniform gas mixing can be achieved in the short distance, the flame distribution is uniform, the capacity of the gas mixing device for adapting to different brands of burners is quite high, the problem that the difference of the air volumes in the peripheral direction of burner heads of different burners is large can be conveniently solved by the same structure, uniform distribution of flames of the burner head is facilitated, the pressure relief function is fulfilled under the condition of tempering, the phenomenon that a safety accident happens due to the damage to the burner fan is avoided, the equipment installation and running space is saved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of gas equipment, and in particular relates to a gas mixing device for an ultra-low nitrogen oxide emission burner. Background technique [0002] The existing traditional boiler is equipped with a gun burner. After the gun burner is transformed into a metal fiber surface combustion method, it has a special structure of the metal fiber burner, so that the combustion occurs on the surface of the metal fiber fabric, and the combustion flame is short and compact. , the smaller boiler furnace size can meet the needs, and the combustion is uniform, which can effectively reduce the generation of NOx, so it gradually begins to be used more and more. [0003] Most of the lance burners transformed into metal fiber surface combustion are pre-mixed after the fan, and a long mixing distance is required for uniform gas mixing. After the boiler is transformed into a gun-type burner with a metal fiber surface combustion me...

AI Technical Summary

Problems solved by technology

After the boiler is transformed into a gun-type burner with a metal fiber surface combustion method, in order to achieve uniform gas mixing, it is required that the length of the non-combustion gas-mixing area of ​​the burner should be long enough during the design process of the burner, and the occupied area should be correspondingly large. , but the actual situation is that the existing residential areas, hotels and other public places can provide limited installation space, which greatly limits the use of this type of burner

And now there are many traditional gun burners that need to be transformed into burners with metal fiber burners, but the opening of the boiler to connect to the burner is generally only a little larger than the flame tube of the original burner. According to the usual metal fiber surface Combustion transformation methods require enlarging the opening to install the modified ignition and flame detection and other supporting devices, and the distance between the gas mixing chamber of the existing burner is relatively long, and the transformation is relatively difficult, and in case of tempering, it cannot Timely pressure relief may cause damage to the burner fan and cause safety accidents

[0004] In addition, due to the centrifugal fans used in traditional gun-type burners, the distribution of air volume in the circumferential direction of the flame cylinder (burner head) is very uneven. In particular, different brands of burners have differences in air duct design. The unevenness of the gas is also very different, especially in the case of short-distance gas mixing, the usual transformation methods are difficult to solve this problem

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