High-speed fuel oil atomizing spray nozzle for thermally spraying fuel gas

Abstract

The invention discloses a high-speed fuel oil atomizing spray nozzle for a thermally spraying fuel gas. The high-speed fuel oil atomizing spray nozzle comprises a primary cavity, wherein a secondary cavity is assembled on the outer wall of the primary cavity; a gas inlet is formed in the inlet end of the primary cavity, an inner cavity is formed in the outlet end of the primary cavity, a similar cone is mounted in the inner cavity, a ring-shaped primary chamber which is gradually expanded towards the peripheral side in the shape of horn from the inside to the outside is formed between the outer wall of the similar cone and the inner wall of the inner cavity, a ring-shaped primary spray nozzle is formed in an opening in the outlet end of the primary cavity, a gas inlet is communicated with the end part, which is arranged on the inner part of the primary cavity, of the primary cavity through a gas conveying channel, an oil injection hole is formed in the secondary cavity, the oil injection hole is communicated with the middle part of the primary chamber through an oil conveying channel, a ring-shaped secondary chamber for conveying secondary gas flow is formed in the secondary cavity, the secondary chamber is communicated with the outer part through a ring-shaped secondary spray nozzle, the secondary spray nozzle is positioned at the peripheral side of the primary spray nozzle, so that secondary gas flow sprayed out by the secondary spray nozzle and mixed gas flow sprayed out by the primary spray nozzle are crossed at a set included angle and collide. The high-speed fuel oil atomizing spray nozzle is used for atomizing the fuel oil through gas power, so that the gas and the fuel oil are uniformly mixed and atomized, and stably combusted.

Description

technical field [0001] The invention relates to a fuel atomizing nozzle for high-speed gas thermal spraying, which belongs to the technical field of fuel atomizing combustion. Background technique [0002] The thermal spray technology based on the combustion of liquid fuel to generate high-velocity gas can be used for the preparation of metal or non-metallic coatings. This technology usually includes two types: oxygen-assisted combustion high-velocity flame spraying and air-assisted combustion high-velocity flame spraying. The common feature is that liquid fuels such as kerosene Atomization occurs, and at the same time it is mixed with oxygen or air to generate a combustible mixture, which is ignited and burned under the action of an external heat source to generate high-temperature and high-speed gas, which heats and accelerates the deposition of the material to be sprayed to form a coating. [0003] Oxygen-assisted combustion kerosene high-velocity flame spraying technolog...

AI Technical Summary

Problems solved by technology

The external mixing nozzle mainly relies on the high-speed flowing gas and liquid flow to atomize under the impact of the nozzle outside. Usually, the nozzle of this structure also uses the mechanical structure to rotate the air flow and liquid flow to produce the centrifugal effect. Therefore, the nozzle The structure is complex and the size is large, so it is not suitable for high-velocity flame spraying

The internal mixing nozzle mainly relies on the high-speed kinetic energy of the gas to impact the fine liquid jet, and then sprays out after being fully mixed in the chamber, so as to realize the atomization of the liquid. The atomization effect of the nozzle with this structure is related to the speed of the gas and the pressure between the gas and the liquid. Poor and other factors are closely related, and the control requirements are relatively high, so it is difficult to apply in the air-assisted high-speed flame spraying technology

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