Burners designed according to the diffusion combustion method are called diffusion burners. The primary air coefficient of the diffusion burner is a’-0, and all the air required for combustion is supplied during the combustion process. According to the different air supply methods, diffusion burners can be divided into two types: natural induced draft type and forced draft type. Natural induced draft burners rely on natural suction to diffuse and supply air. They are mostly used for civilian purposes and are often referred to as diffusion burners. Forced air burner relies on a blower to supply air. It is mostly used in industry and is often referred to as a forced air burner.
The simplest diffusion burner is made by drilling a row of fire holes in a steel pipe. The gas enters the pipe under a certain pressure. After escaping through the fire holes, it obtains oxygen from the surrounding air and burns, forming a diffusion flame according to the heating. Depending on the needs of the process, natural draft diffusion burners can be made into various forms.
The natural induced draft diffusion burner has a simple structure and is easy to manufacture. It has the advantages of stable combustion, no backfire, easy ignition, and convenient adjustment. In addition, low-pressure gas can also be used, and no air blast is required and no power consumption is required. However, this type of burner has low combustion heat intensity, long flame, and requires a larger combustion chamber. It is easy to produce incomplete combustion and even black smoke. For complete combustion, more excess air must be supplied. Due to the large excess air coefficient, low combustion temperature and large exhaust heat loss
Natural induced draft diffusion burners are mainly suitable for occasions where temperature requirements are not high, but uniform temperature and stable flame are required, such as water boilers, water heaters, heating in the textile industry and food industry, and ignition in small heating boilers. device. When some industrial kilns require the flame to have a certain brightness or a certain protective atmosphere, natural draft diffusion burners can also be used. Because of its simple structure and easy operation, it is often used in temporary heating equipment. Laminar flow diffusion burners are generally not suitable for natural gas and liquefied petroleum gas. Because these two types of gas burn slowly, they are prone to incomplete combustion and smoke.