A Small Disc Premixed Burner with Efficient Preheating and Flashback Prevention

Abstract

The invention belongs to the small-scale combustion technology field, and especially discloses an efficient preheating anti-backfire small disc premixing combustor. The combustor comprises a fuel preheating body, an annular boss and a combustion chamber lower disc. The fuel preheating body comprises an upper cover plate, a lower wall plate and a fuel preheating channel arranged between the upper cover plate and the lower wall plate in a spiral mode. The combustion chamber lower disc and the lower wall plate are arranged at intervals so as to form an annular combustion chamber of the premixingcombustor. One end of the annular boss is fixedly connected with the lower wall plate, the other end and the combustion chamber lower disc are arranged at intervals, and a fuel channel is arranged inthe annular boss. One end of the fuel channel is connected with a through hole which is arranged on the lower wall plate and is used for connecting the annular boss and an air outlet of the fuel preheating channel, and the other end is connected with an inlet of the annular combustion chamber. Efficient preheating and stable and efficient combustion of a fuel premixed gas can be effectively achieved, and the combustor is suitable for various small power or heating devices.

Description

technical field [0001] The invention belongs to the technical field of small-scale combustion, and more specifically relates to a small disc premix burner with high-efficiency preheating and anti-backfire. Background technique [0002] Microelectromechanical devices (MEMS) have developed rapidly recently, with devices such as small drones, small rockets, and small propulsion systems emerging. At present, these devices are mainly functioned by conventional batteries, and conventional batteries have some disadvantages: (1) low energy density; (2) large weight and volume; (3) long time to replenish energy consumption. The combustion of hydrocarbon fuels can release high energy density. For example, the energy density of typical hydrocarbon fuels can reach ~45MJ / kg, while the energy density of conventional chemical batteries Zinc / Air is only ~1.65MJ / kg. Moreover, the combustion of hydrocarbon fuels is basically non-polluting to the environment, and the combustion products are o...

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Problems solved by technology

At present, these devices are mainly functioned by conventional batteries, and conventional batteries have some disadvantages: (1) low energy density; (2) large weight and volume; (3) long time to replenish energy consumption

For this reason, many scholars use the method of heat reflux to stabilize the flame to broaden the flammable range. This method mainly increases the initial reaction temperature by preheating the unburned fuel mixture, but this method cannot effectively anchor the flame position and is prone to Temper

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