The nozzle for the combustion of heavy fuel

 

(57) Abstract:

Usage: for the combustion of heavy liquid fuels in process furnaces and boilers. The inventive mixed fuel and spray in the annular gap axial cylinder to act on the part of the flow fluctuation generated in the ring resonator. 2 C.p. f-crystals, 1 Il.

The invention relates to energy and can be used for the combustion of heavy liquid fuels in process furnaces and boilers.

Known burner for combustion of heavy fuels with coaxial pipes for fuel and spray agent, and the fuel nozzle is in the form of an annular slit, inclined in the direction against the flow of the nebulizer (1). The disadvantage of this construction of the nozzle is relatively narrow range of stable operation at variable loads for fuel.

Closest to the technical nature of the claimed object is a burner for combustion of heavy fuels containing peripheral and a Central tube forming the Central and annular channels for the passage, respectively, and fuel spray (oxidizer), while the Central pipe has on the side surface of the fuel nozzle the reconstruction of the nozzle is a relatively low efficiency of atomization of fuel and in this regard, a relatively large flow of the spray agent, which ultimately leads to lower steady operation at variable loads for fuel.

The aim of the invention is to improve the quality of atomization of the fuel and increase the range of stable operation of the injector.

This objective is achieved in that the axis of the tubes are displaced relative to each other by the value of (), which is determined from the relation:

= (Dp- DC) /0,05-0,1/,

where Dpand DC- the diameter of the peripheral and Central pipes, respectively. The fuel nozzle is made larger cross-section of the annular channel and divides the annular channel height from the swirler to the end of the Central pipe at the top (hinbottom (hnzone ) with the ratio of their heights as 3:1, and the peripheral surface of the pipe in the plane of the end caps are made of a ring resonator Hartmann.

For stable rotation of the flow in the annular channel of the nozzle, it is advisable on the inner peripheral surface of the pipe in the upper area of the annular channel to perform a spiral groove with outputs in the base of the resonator.

To improve the characteristics of the torch nozzle is expedient in the end Pereyaslavl nozzle for the combustion of heavy fuel oil (longitudinal section).

The nozzle for the combustion of heavy fuel consists of a peripheral pipe 1 and the Central pipe 2 for feeding the atomizer and fuel, respectively. Moreover, the axis of the pipes 1 and 2 are displaced relative to each other by the value () that is defined from the relation:

= (Dp- DC)/0.05-0.1/,

where Dpand DC- the diameter of the peripheral and Central pipes, respectively. With this displacement of the pipes 1 and 2 relative to each other in longitudinal section of the nozzle is formed of two channels with different cross-sections. In the side surface of the pipe 2 in a larger cross-section of the annular channel is made of the fuel nozzle 3. Below the nozzle 3 in the annular channel swirl 4. At the end of the Central pipe 2 made the cover 5. The nozzle 3 for supplying fuel is located at the height of the annular channel from the swirler 4 until the end of the tube 2 in such a way that divides the volume on the top (hin) and lower (hnarea ratio of the heights hin: hn= 3 : 1. On the surface of the pipe 1 in the plane of the stub 5 is made of a ring resonator Hartmann 6. The surface of the pipe 2 in the upper zone (hin) the annular channel can be provided with an annular groove 7 with outputs in the base of the resonator 6. The end of the pipe 1 provided with a cone 8 with toplami 9 in the base of it.

nthe area of the ring channel. The height of this zone is chosen empirically so as to provide a tight closure of the individual jets of spray in the cylinder. Atomizer and fuel are mixed in the upper zone (hin) the annular channel, where on the surface of the pipe 1 for stable rotation of threads executed by a spiral groove 7. The mixture of fuel spray from the annular channel partially enters the ring resonator Hartmann 6, which generates sound vibrations, angled 90oto the rest of the mixture, istiqaamah of an annular channel. The combination of acoustic and dynamic effects on streams allows to achieve high quality atomization at low unit costs of spray compared to the base object (the prototype). The obtained fine fuel mixture is thus, the use of the inventive nozzle for the combustion of liquid fuel allows for uniform mixing of fuel and spray in "rotating cylinder and the combination of dynamic and acoustic impacts on streams, allows to improve the quality of atomization of the fuel and thereby increase the range of stable operation of the nozzle with variable loads on the fuel.

1. The nozzle for the combustion of heavy fuel containing a peripheral and a Central tube forming the Central and annular channels for the passage respectively of fuel and spray, while the Central pipe has on the side surface of the fuel nozzle and the end cap and the annular section has swirl, characterized in that the axis of the tubes are displaced relative to each other by an amount determined from the relation

= (Dp- DC) (0,05oC 0,1),

where Dpand DC- the diameter of the peripheral and Central pipes, respectively,

and the fuel nozzle is made larger cross-section of the annular channel and divides the annular channel at its height from the swirler to the end of the Central pipe on the top of the hinand lower hnareas with the ratio of their heights as 3 : 1, and the peripheral surface of the Oia heavy fuel under item 1, characterized in that on the inner peripheral surface of the pipe in the upper area of the annular channel made a spiral groove with outputs in the base of the resonator.

3. The nozzle for the combustion of heavy fuel PP.1 and 2, characterized in that the peripheral end of the tube is placed a cone nozzles at its base.

 

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