Precombustion chamber device and combustion system

Abstract

The invention discloses a precombustion chamber device and a combustion system, and relates to the field of combustion equipment. The problem of precombustion chamber overheating scorification is solved. The precombustion chamber device comprises a precombustion chamber and a cooling device, the cooling device comprises a fluid output structure communicating with a cavity, an output port of the fluid output structure is arranged near the side wall of the precombustion chamber, and the cooling device is used for outputting fluid for cooling the side wall of the precombustion chamber. Accordingto the technical scheme, the fluid output structure capable of outputting low-temperature noncombustible non-combustion-supporting fluid is achieved, the temperature of the side wall of the precombustion chamber can be decreased through the low-temperature fluid output by the structure, and the problem of overheating scorification is prevented for the side wall of the precombustion chamber. Further, low-temperature fluid can blow away dust attached to the side wall of the precombustion cavity.

Description

technical field [0001] The invention relates to the field of combustion equipment, in particular to a pre-combustion chamber device and a combustion system. Background technique [0002] The conventional pre-combustion chamber is usually used to burn low-quality coal such as lean coal and anthracite, which can not only save a lot of fuel during the start-up process of the furnace, but also make the furnace burn stably without fuel injection under lower load, and improve the peak-shaving capability of the unit. [0003] The inventor has found that there are at least the following problems in the prior art: in actual operation, there are still several problems in the conventional pre-chamber: [0004] First of all, there are problems of over-temperature slagging and powder accumulation in the pre-combustion chamber. The principle of the pre-combustion chamber is that the inner wall of the pre-combustion chamber is made of heat-insulating material to maintain a high temperatur...

AI Technical Summary

Problems solved by technology

The principle of the pre-combustion chamber is that the inner wall of the pre-combustion chamber is made of heat-insulating material to maintain a high temperature in the room. At the same time, the high-temperature smoke is entrained by the jet flow to form a recirculation zone, which is conducive to the early ignition of coal powder. However, the actual operation is often subject to fluctuations in working conditions. , the combustion is unstable, prone to local overheating, the inner wall of the pre-combustion is prone to slagging, and the inner wall is also easy to accumulate unburned coal powder

[0005] For some coal-fired industrial furnaces, during operation, due to the high temperature in the central area, the central nozzle of the burner is bent and deformed to varying degrees due to overheating, the burner flame deviates from the axial direction of the pre-combustion chamber, and the high-temperature area of ​​the flame directly contacts The inner wall of the pre-combustion chamber will also cause serious slagging, and even the structure of the pre-combustion chamber will be deformed

[0006] Secondly, there is the problem of large NOx emissions

Conventional pre-combustion chambers are usually used to burn low-quality coal such as lean coal and anthracite, and this kind of coal is difficult to burn. Generally, the combustion temperature is higher, so the NOx emission is also higher

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