CN2341721Y - Pneumatic atomizing fuel nozzle - Google Patents

Abstract

The utility model relates to a pneumatic atomizing fuel nozzle, used for industrial furnaces or kilns and belonging to a combustion device. The utility model is composed of a casing, an air nozzle and an oil nozzle, wherein, an outer air duct is arranged between the casing and the air nozzle; a vortex chamber is arranged between the air nozzle and the oil nozzle; primary air in the vortex chamber is used for the primary atomization to fuel; gas and liquid two-phase vortex is formed at the outlet of the vortex chamber; secondary air in the outer air duct is used for atomizing the fuel in the two-phase vortex; the utility model overcomes the defects of high pressure of the required atomization air and easy coke formation of the diesel oil nozzle used in the traditional ceramic kilns. The utility model has the advantages of good atomization, high combustion efficiency, stable flame, good temperature control, etc.

Description

Pneumatic type atomized fuel nozzle

The utility model pneumatic type atomized fuel nozzle is used for industrial furnace or kiln.

The present diesel fuel nozzle that uses of ceramic kiln is imitated entry nozzle and getting mostly, and its principle is basic identical, promptly utilize the atomizing air of elevated pressures, in atomizing piece, produce swirling eddy, drive fuel oil and rotate together, make fuel oil obtain shearing atomizing because of centrifugal action at a high speed at the spout place.The shortcoming of this nozzle is the required atomization air pressure height that provides, pressure reaches more than the 0.07MPa and could atomize more satisfactoryly before the atomizing air arrival nozzle, and domestic many ceramics factories atomizing air can only reach about 0.04MPa before arriving nozzle at present, cause nozzle atomization bad, nozzle and the place ahead burner block place are easy to coking, influence kiln temperature control, make to burn till product quality decline, atomization badness directly causes efficiency of combustion to descend simultaneously, and oil consumption is higher.

The pneumatic type atomizer that the utility model provides can be applicable to the duty that atomization air pressure is very low, is aerosolizable good as long as atomization air pressure reaches more than the 0.03MPa, is difficult for coking, the efficiency of combustion height.

Design principle of the present utility model is to utilize the one-level atomizing air to produce eddy flow in the atomizing valve, and fully mix with fuel oil, a gas, liquid two-phase vortex have been formed when arriving the valve exit, utilize the secondary atomizing air that is passed through between valve and the shell that the drop in the two-phase vortex is carried out secondary-atomizing again, thereby atomized very thin, the mist of oil that is evenly distributed.

Structure of the present utility model comprises shell, valve and oil nozzle.Be characterized in that an exterior air drain is arranged between shell and the valve, two parts before and after exterior air drain is divided into by dividing plate, have intercommunicating pore on the dividing plate, form an empty thorax between valve and the oil nozzle, be called the minor air cell, have the air admission hole of disalignment on minor air cell's wall, the port of export of minor air cell is contraction structure gradually.The course of work of this nozzle is: atomizing air is injected the minor air cell from the eccentric air admission hole on the valve, fuel oil to the oil nozzle ejection impacts atomizing, make it to be broken into graininess, meanwhile, this part band rotational gas flow forms one eddy flow in the minor air cell, under the effect of this strand eddy flow, fuel oil fully mixes in the minor air cell with air, has formed a gas, liquid two-phase vortex when arriving the valve outlet; Intercommunicating pore on the dividing plate plays the effect of guiding and current limliting to the exterior air drain air-flow, the air-flow of exterior air drain is because of the guide effect of outer casing inner wall face and valve outside wall surface, arrive spout place and axis direction and form certain angle, fuel particles in the gas-liquid two-phase vortex that sprays in the minor air cell is atomized, thus atomized good mist of oil.

Pneumatic type atomized fuel nozzle of the present utility model is through experiment and on-site verification, the above atomizing of atomizing pressure 0.03MPa in order before the nozzle, both burning diesel oil, also burning heavy diesel fuel or heavy oil and diesel oil the preparation miscella, the scope of application is wide, the flame cleaning is bright, few coking, and empty furnace temperature control is very stable.

Below in conjunction with accompanying drawing enforcement structure of the present utility model is described:

Accompanying drawing is the enforcement structure chart of pneumatic type atomized fuel nozzle.

From figure, see, an exterior air drain 4 is arranged between shell 1 and valve 2, exterior air drain 4 is divided into two parts by dividing plate 5, have intercommunicating pore 6 on the dividing plate, between valve 2 and oil nozzle 3, form a minor air cell 7, the port of export of minor air cell 7 is contraction structure gradually, has the air admission hole 8 of disalignment on the wall of minor air cell 7.

Claims (1)

1, a kind of pneumatic type atomized fuel nozzle, comprise shell, valve and oil nozzle, it is characterized in that: between shell (1) and the valve (2) exterior air drain (4) is arranged, exterior air drain is divided into two parts by dividing plate (5), have intercommunicating pore (6) on the dividing plate, between valve (2) and oil nozzle (3) minor air cell (7) is arranged, the port of export of minor air cell (7) is contraction structure gradually, has the air admission hole (8) of disalignment on the wall of minor air cell (7).