Burner for liquid fuel

FIELD: burners.

SUBSTANCE: burner is made of well of specified length (up to 650 mm). The fuel flowing through stabilizer of fuel supply enters the fuel supply pipe and then through fuel nozzles to the mixing chamber of the nozzle. The fuel jet impacts on the conical hollow in the working face of the deflector, thus enhancing the spraying of fuel. The compressed steam enters the ring passage defined by the fuel and steam supply pipes. The steam then enters the first (hydraulic) spraing stage of the mixing chamber through the steam nozzles drilled in the swirler radially and tangentially. The mixing chamber is interposed between the hydraulic deflector and exit section of the fuel nozzle. The steam entrains the fuel jet broken down with the deflector and then continues to break it in the second (gas) spraying stage, in the zone around the rod of the hydraulic deflector.

EFFECT: improved quality of spraying.

3 cl, 4 dwg

 

The invention relates to a device for atomizing liquid fuels, mainly oil, and can be used when it is incinerated thermal units of chemical, petrochemical and refining industries, including tubular and hip furnaces refineries, installations for distillation of petroleum and other hydrocarbons.

Known burner for liquid fuel used in the furnaces of steam generators, button containing an axis of the nozzle, reflector, a combustion chamber, the pressure duct and the ejectors feed the primary and secondary air (see USSR author's certificate No. 1513310 in class. F 23 D 7/00, 1989).

However, the burner does not ensure the stability of the flame in wide variations in the fuel composition, its parameters (pressure, temperature, flow rate) and the ratio of the cost of gas and liquid (oil), and most importantly - because of the heterogeneity of the resulting combustible mixture are observed increased emissions of harmful substances into the atmosphere.

The closest analogue (prototype) of the inventive burner is a burner for liquid fuel, is presented in the patent of the Russian Federation No. 2072475 in class. F 23 D 11/10, 1997. Burner contains located on its axis aerodynamic nozzle with hydraulic reflector and attached steam and fuel nutritious pipe.

Because every what I mentioned nutrient tubes in this design of the burner forms an independent branch, such a burner is difficult to compose in the form of a long thin trunk of a compact design, the desired operating conditions of the burner in the furnace oil refineries, and the fact that steam feeding pipe attached radially to the housing of the injector, it is not possible to obtain a sufficiently homogeneous combustible mixture. Another disadvantage of the prototype is that the fuel and vapor enter the mixing chamber of the nozzle parallel flows along the axis of the burner, which does not allow to achieve the highest possible degree of grinding of the fuel, especially in the case of fuel oil. In addition, the design of this burner is missing the device controlling the fuel supply, which would allow to ensure a stable supply of fuel in the mixing chamber of the nozzle fluctuations in steam pressure, and, if necessary, to modify the nominal capacity of the burner.

The technical result of the invention is the maximal compact design of the burner, the desired operating conditions of the burner in the furnace oil refineries, the decrease in the content of environmentally harmful impurities in the combustion products by improving the quality of the spray and combustion efficiency, the sustainability of its supply to the mixing chamber of the nozzle, and the possibility, if necessary, treason is s rated capacity of the burner by a simple modification of one of the nodes of the burner.

This technical result is achieved in that in a burner for liquid fuels, primarily oil, containing situated on its axis aerodynamic nozzle with hydraulic reflector and attached fuel and steam nutritional pipe, the latter is in the form of the barrel, covering nutritious fuel pipe and forming with it an annular channel connected to a source of steam radial feed pipe; the hydraulic reflector aerodynamic nozzle made in the form of conical recesses installed in its mixing chamber at the inlet of the fuel nozzle; a steam nozzle aerodynamic nozzles are radially or tangentially in the area between the end face of the hydraulic reflector and the exit of the fuel nozzle. This burner has a control unit fuel stabilizer fuel, made in the form prescribed in the fuel nutritious tube package throttle washers, and in the above-mentioned package throttle washers used orifice plates of two types - with a Central hole and with a hole that is offset from the axis of the orifice plates.

Figure 1 shows a longitudinal section of the burner, figure 2 is a longitudinal section of the aerodynamic nozzle burner, figure 3 - cross section a-a of figure 2, figure 4 - node stabilizer feed that is Liwa in the context of: a) the maximum amount of throttle spacers; b) with a reduced amount of throttle washers.

As shown in figure 1, the proposed burner for liquid fuel contains located on its axis aerodynamic nozzle 1, is equipped with a hydraulic reflector 2, and attached the fuel 3 and 4 steam nutritional pipe.

In accordance with the purpose of the invention of the steam feeding pipe 4 is made in the form of the trunk of a given length (up to 650 mm), covering nutritious fuel pipe 3 and forming with it an annular channel 5 connected to a source of steam radial feed pipe 6. The fuel feeding pipe 3 is connected with a fuel injection system with fuel flange 7, and the left flange of the connection, as shown in figure 1, has a thickness of 8 with a conical surface, to which its right end is welded steam feeding pipe 4. Its left-hand end of the pipe is based on three pad 9 (see figure 2 and 3)welded to the left end of the nutritious fuel pipe 3. The right end of the pipe butt welded to tubular branch above left flange.

Aerodynamic nozzle 1 of the burner (figure 2) consists of steinebrunner housing 10 with the output nozzles 11 located inside the swirler 12, forming the mixing chamber 13. The swirler 12 is connected with the left end of the fuel nutritious pipe 3 through the top of the active handpiece 14, he has a threaded connection. Itself fuel the tip 14 is welded to the left end of the nutritious fuel pipe 3.

Similarly, the body 10 of the nozzle is connected to a steam feed pipe 4 through steam tip 15 welded to the left end of the pipe. Threaded connections sealed with seal rings 16 and 17, respectively.

As shown in figure 2, the hydraulic reflector 2 of the nozzle is made in the form of a rod mounted in the mixing chamber 13 on its axis at the exit of the fuel nozzle 18. The working face of the reflector 2 has a conical recess, the angle of which is at the apex of the cone can be taken within 90-150°. Steam nozzle 19, is made in the swirler 12 are radially or tangentially in the zone between the working face of the reflector 2 and the exit of the fuel nozzle 18. This zone, in which the stream of fuel flowing from the fuel nozzle 18, crashing, banging against the working face of the reflector 2, is the first hydraulic stage spray of fuel. Second, the gas, the degree of dispersion, where the “grinding” of fuel vapor that is in the portion of the mixing chamber 13, which surrounds the stem of the reflector 2.

The proposed burner is equipped with control unit - stabilizer 20 fuel (1, 4), which is a package or set the throttle washers 21, is installed at the inlet of the fuel nutritious pipe 3. Orifice plates 21 are placed in the tubular body 22 with the lock sleeve 23 and the flange 24 and fixed by screw 25. This is the design of the stabilizer fuel supply when applying maximum throttle washers (in our example, figa - seven throttle washers). If necessary, reduce the throttle washers, e.g. up to three, as shown in figb between service throttle washers and screws 25 install the spacer 26. The amount of throttle washers in the stabilizer fuel supply is determined by the required fuel consumption.

The stabilizer fuel supply is fixed in the fuel nutritious pipe, clamping its flange 24 between the flanges of the fuel flange, as shown in figure 1, with the use of gaskets 27.

In the described stabilizer fuel used orifice plates of two types: with a Central hole and with a hole that is offset from the axis of the orifice plates. They are installed, alternating between them and thus creating a zigzag for fuel, which more effectively smoothes possible pressure pulsations in the fuel injection system. In General, the stabilizer fuel supply is designed to change the rated capacity of the burner and ensure sustainable supply of fuel into the mixing chamber when the oscillation on the effect of steam before the burner.

The burner works as follows.

Fuel is supplied to the flanged connection 7 (see figure 1) and passing through the stabilizer 20 fuel enters the fuel nutritious pipe 3 and then through the fuel nozzle 18 (see figure 2) in the mixing chamber 13 of the nozzle. While jet fuel hits the conical cavity at the working end of the reflector 2, which increases the spray of fuel.

The compressed vapor through the radial nutritional pipe 6 enters the annular channel 5 formed of the fuel 3 and 4 steam nutrient pipes. Then the steam from the steam nozzle 19, radially or tangentially drilled in the swirler 12, enters the mixing chamber 13, namely in its first stage nozzle in the zone between the hydraulic reflector 2 and the exit of the fuel nozzle 18, picks up crashed on the reflector jet fuel and then continues to grind his second stage spray the area around the rod of the hydraulic reflector 2. Formed in this way fine protoplasma the mixture through the output nozzle 11 nozzle enters the recess of the furnace. At the exit of the nozzle 11, the fuel is additionally split up due to a rapid expansion of steam and fuel.

Additional management mode of operation of the burner produces a change of the flow in her steam and fuel.

The burner is particularly effective when the burning and fuel oil.

Sources of information

SU 1513310 A1, 07.10.1989.

EN 2072475 C1, 27.01.1997 (prototype).

1. Burner for liquid fuels, primarily oil, containing situated on its axis aerodynamic nozzle with hydraulic reflector and attached fuel and steam nutritional pipe, characterized in that the steam feeding pipe is made in the form of the barrel, covering nutritious fuel pipe and forming with it an annular channel connected to a source of steam radial feed pipe, and the hydraulic reflector aerodynamic nozzle made in the form of conical recesses installed in its mixing chamber at the inlet of the fuel nozzle.

2. Burner according to claim 1, characterized in that the steam nozzle aerodynamic nozzles are radially or tangentially in the area between the hydraulic reflector and the exit of the fuel nozzle.

3. The burner according to any one of the preceding paragraphs, characterized in that it is equipped with control unit - stabilizer fuel, made in the form prescribed in the fuel nutritious tube package throttle washers.

4. Burner according to claim 3, characterized in that in the above-mentioned stabilizer fuel used orifice plates of two types - with a Central hole and with a hole that is offset from the axis of the dross is through the washer.



 

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