What are the Technical Characteristics of Low Nitrogen Burners?
What are the Technical Characteristics of Low Nitrogen Burners?
With the application of low nitrogen burners, there are a wide variety of low-nitrogen burners on the market. To purchase a suitable low-nitrogen burner, we need to have an understanding of low-nitrogen burners. Let’s take a look at the technical characteristics of several common low-nitrogen burners.
1. Diffusion combustion
This is a simple combustion method with the advantages of simplicity, easy ignition, no flashback, stable combustion, and a simple gas appliance structure. The disadvantage is that for high calorific value gas with large air demand, full combustion cannot be achieved by laminar diffusion, the content of C0 in the flue gas is relatively high, and the volume of the gas appliance is relatively large. Forced blast diffusion combustion is commonly used for industrial burners in industrial furnaces. Adopting this combustion method requires reasonably organizing the mixing of air and gas to avoid generating a large amount of N0x and C0.
2. Partially premixed combustion
Partially premixed combustion is conventionally known as atmospheric combustion. Compared to diffusion combustion, partial premixed combustion has the advantages of full combustion, short flame length, and high thermal intensity. However, this combustion method may generate backfire, flame separation, and misfire. Under the condition of controlling the primary air well, it can have a certain range of stable flame zones that do not separate from the flame and do not backfire. In this zone, the thermal load can be adjusted. Partially premixed combustion also has the following disadvantages: a. It is necessary to organize the secondary air well, and it requires sufficient secondary air inlet area and necessary furnace height, making it difficult to reduce the volume of combustion equipment. B. The content of N0x in combustion products is relatively high. After taking measures, the content of N0x decreases, while the content of C0 increases, making it difficult to achieve the effect of reducing both the content of C0 and N0x.
In some high-power burner structures, in order to ensure the success rate of ignition, a flame black zone is formed in the center, and partial premixing is used. Others are the same as diffusion combustion.