How to change the length of the coherent jet

 

(57) Abstract:

The invention relates to techniques using coherent jet. How to change the length of the coherent jet contains (A) the flow of the main gas main gas stream at a flow rate of the main gas flow of the gaseous fuel at a first flow rate of the gaseous fuel and the combustion of gaseous fuel with the oxidant to form a sheath of flame, coaxially to the main gas stream, to create a coherent jet having a first length, after this exercise (B) submission of main gas main gas stream at a flow rate of the main gas flow of the gaseous fuel at a second flow rate of gaseous fuel, which is different from the first flow rate of the gaseous fuel and the combustion of gaseous fuel with the oxidant to form a sheath of flame, coaxially to the main gas stream, to create a coherent jet having a second length that is different from the first length. The invention allows for the change of the wavelength of the coherent jet without having to modify the equipment used to create a coherent jet, and without changing any other parameter of the gas, forming a coherent strumental jet.

Recent significant achievement in the field of gas dynamics is the development of techniques using coherent jet, which creates a jet of gas like a laser beam, which may extend for a long distance, while still retaining essentially all of its original speed with a very small increase in the diameter of the jet. One very important case of industrial technology use coherent jet is the introduction of a gas into a liquid, such as molten metal, wherein the gas injector can be positioned at a large distance from the surface of the liquid, which provides a safer and more efficient operation due to the much greater penetration of gas in the liquid than is possible with conventional practice, when the majority of the gas is reflected from the surface of the liquid and is not included in it.

In some cases it is desirable to change the length of the coherent jet, for example its length from the gas injector to the surface of the liquid. This can be done by changing the height of the gas injector, i.e., placing it closer to the liquid surface or away from it, but it is a burden, Onimusha injector, but, again, this is inconvenient. You can also change the length of the coherent jet by changing the gas flow, which forms a coherent jet. However, this practice may be undesirable, as it potentially can adversely affect the whole process, such as refining of metal, which applies the technology of using coherent jet.

There is a method of changing the length of the coherent jet containing the flow of the main gas main gas stream at a flow rate of the main gas flow of the gaseous fuel at a first flow rate of the gaseous fuel and the combustion of gaseous fuel with the oxidant to form a sheath of flame, coaxially to the main gas stream, to create a coherent jet having a first length (US 5823762).

The objective of the invention is to provide a method for changing the length of the coherent jet without having to modify the equipment used to create a coherent jet, and without changing any other parameter of the gas, forming a coherent stream, such as its consumption.

The above and other objectives which will become apparent to experts in the field after about the flow of the main gas main gas stream at a flow rate of the main gas the flow of gaseous fuel at a first flow rate of the gaseous fuel and the combustion of gaseous fuel with the oxidant to form a sheath of flame, coaxially to the main gas stream, to create a coherent jet having a first length, according to the invention is then carried out (B) submission of main gas main gas stream at a flow rate of the main gas flow of the gaseous fuel at a second flow rate of gaseous fuel, which is different from the first flow rate of the gaseous fuel and the combustion of gaseous fuel with the oxidant to form a sheath of flame, coaxially to the main gas stream, to create a coherent jet having a second length, which is different from the first length. The second flow of gaseous fuel may be greater than the first flow rate of the gaseous fuel and the second length is greater than the first length. The second flow of gaseous fuel can also be smaller than the first flow rate of the gaseous fuel and the second length less than the first length.

As the primary gas using gaseous oxygen and add the inert gas in the gaseous fuel is supplied at a second flow rate of gaseous fuel, as the inert gas used and the second flow of gaseous fuel is essentially equal to the first flow of gaseous fuel. The inert gas at the first flow rate of the inert gas is added to the gaseous fuel delivered at the first flow rate of fuel gas, and an inert gas at a second flow rate of the inert gas is added to the gaseous fuel is supplied at a second flow rate of gaseous fuel.

In the process use a multitude of coherent jets and consumption of gaseous fuels for each of these coherent jets of change to change the length of each of the coherent jet. Moreover, the oxidant for combustion of gaseous fuel for the formation of a sheath of flame serves on the stage (A) with a flow rate, which is essentially the same as the flow rate at which it is served at the stage (B).

Used herein, the term "coherent stream" means a gas stream that is at a considerable distance from the nozzle, from which it is released, has a velocity profile similar to the velocity profile, which it has when issuing from the nozzle.

Used herein, the term "ring" means, in the form of a ring.

Used herein, the term "shell burning" means burning ring flow, axial flow of the main gas.

Used herein, the term "length", when he apply the steps of coherent gas jet or until where a jet of gas ceases to be coherent.

The invention will be described in detail with reference to the drawings, where

in Fig.1 shows a view in section;

in Fig.2 is a view of the front of one possible implementation of the tip of the lance, which can be used as injector for gas in the implementation of this invention;

in Fig. 3 and 4 the principle of the invention, whereby to change the length of the coherent jet. Position on the figures are the same for the common elements;

in Fig. 5 is a graphic representation of test results showing the principle of the invention.

Detailed description of the invention

As shown in Fig.1 and 2, the main gas passes through the Central channel 2 lance 1 for the formation of a coherent jet and then through the wrong-expanding nozzle 50, and then exits the lance 1 through the opening 11 of the nozzle, forming a main gas stream. Typically, the flow rate of the primary gas is in the range from 300 to 2440 meters per second (m/sec), the flow rate of the primary gas in the range from 280 to 56600 cubic meters per hour (m3/hour).

When carrying out the invention as the primary gas may be used any effecor and gaseous hydrocarbons. When carrying out this invention it is possible as the primary gas to be used as a mixture containing two or more gases, for example air. A particularly useful gas for use as the main gas in the implementation of this invention is gaseous oxygen, which can be defined as a fluid having an oxygen concentration of at least 25 mol. %. Gaseous oxygen can have a concentration of oxygen greater than 90 mol.%, and can be technical oxygen, which is essentially pure oxygen.

Gaseous fuels, namely methane, natural gas or atomized liquid, for example sprayed liquid fuel flow through the tuyere 1, or through the channel 3, or channel 4, each of which in the radial direction is located at a distance from the Central channel 2 and is coaxial him. Gaseous fuel is preferable to pass through the axial channel 3 located closer to the center. Gaseous fuel exits the lance is preferably 1 or through the nozzle 7, or through the nozzle 8 shown in Fig.1, at the location of the end surface 5 lance flush with the nozzle orifice 50. Each hole of the nozzles 7 and 8 could predstavlyalsya 9 and 10 around the opening 11 of the nozzle. Gaseous fuel out of the injectors 1 at a speed which is preferably less than the velocity of the main gas, and is usually in the range from 30 to 300 m/sec.

Gaseous fuel is burned with an oxidizer to form a sheath of flame around the main gas stream and along preferably the entire length of the coherent jet. The oxidant may be air, oxygen-enriched air having an oxygen concentration greater than its concentration in normal air or technically pure oxygen having an oxygen concentration of at least 99 mol.%. The oxidant preferably is a fluid having an oxygen concentration of at least 25 mol.%. The oxidant can be used for burning gaseous fuel in any effective way. In one preferred variant of embodiment of the invention, which is shown in Fig.1 and 2, the oxidizer is fed through a coaxial channel or channel 3 or channel 4, which is not used for supplying gaseous fuel. This leads to interaction and combustion of gaseous fuel and oxidant with the formation of a sheath of flame in their respective editions of the lance 1.

Shell of flame around the main stream Hamouda a significant reduction in the rate of flow of the primary gas and a significant increase in the diameter of this stream to its desired length, until it reaches the desired point of impact, for example the surface of a bath of molten metal. Thus, the shell of the flame serves to create and maintain the flow of the main gas in the form of a coherent jet length of the jet.

The invention makes it possible to change the length of the coherent jet without having to make any changes to the hardware, for example, by changing the nozzle for the primary gas or by changing the distance between the tip of the tuyere and the desired point of impact of the jet, as well as without the need to change the flow of the main gas. When carrying out this invention, when it is desirable to change the length of the coherent jet with the existing length, i.e. from the first length to another length, i.e., the second length, all that is needed is to change the flow of gaseous fuel to flow, used to create the shell of the flame associated with the first length, i.e., the first flow rate of the gaseous fuel at the second flow rate. Increase the flow of gaseous fuel from the first to the second flow rate will increase the length of the coherent jet from the first length to the second length, and the reduction of the flow of gaseous fuel from the first to the second flow rate will reduce the length of the coherent jet with the first length nervou length in Fig.3, which is greater than the second length in Fig.4. In General, the coherent length of the jet is approximately proportional to the square root of the flow rate of gaseous fuel. In addition, Fig.3 and 4 illustrate a particularly preferred embodiment of the invention, which used the ledge promotes the formation of a sheath of flame. The protrusion 21 having a length essentially within 13-152 mm, extending from the end surface 5 of the lance with the formation of the cavity 22, which is communicated to the outlet 11 of a nozzle and an annular exhaust ports 7 and 8 and in which the initially formed gas stream and sheath flame 23 around the jet 20 of the main gas. The cavity 22 formed by the protrusion 21, creates a protective zone, which serves to protect the main flow of gas, and also fuel and oxidant immediately after their exit from the end of the lance, thus contributing to the achievement of coherence in the stream of primary gas. Protection zone causes a recirculation of the fuel and oxidant around the jet of primary gas.

As an example to further illustrate the invention presents the following test results. They are not considered as restrictive. In these examples to create a coherent strval converging-diverging nozzle with a diameter of the neck of 15.75 mm and the diameter of the outlet 20,57 mm. The main gas was technically pure oxygen, which is released from the lance at a flow rate of 1020 cubic meters per hour (m3/hour) at a pressure of 7 kg/cm2. Gaseous fuel was natural gas that have been entered through the channel, located closer to the center, and exited from the tuyere through 16 holes, each of which had a diameter of 3,912 mm and was located on the front surface of the lance on the circle with diameter 50,8 mm-Oxidant, which burned with gaseous fuel with the formation of a sheath of flame, was technically pure oxygen, which was filed through the channel, located closer to the periphery, and released from the tuyere through 16 holes, each of which had a diameter of 5,055 mm and was located on the front surface of the lance on the circle diameter mm 69.85 mm During the test the flow of oxygen is maintained constant, while the changed flow of gaseous fuel. The lance in its periphery also had a protrusion length of 50.8 mm for shielding gases after their release from lance. Coherent jet had supersonic speed of about 486 m/s.

When this flow of gaseous fuel measured the length of the coherent jet formed by these parameters, and registrirovali new, i.e., the second, the length of the coherent jet. The results are shown in Fig.5 as curve A. In Fig.5 the measured length of the coherent jet deferred on the vertical axis and the measured values of the flow rate of gaseous fuel along the horizontal axis. As you can see on the curve And, possibly increasing the length of the coherent jet by increasing the flow rate of gaseous fuel, and may reduce the length of the coherent jet by reducing the flow of gaseous fuel.

In the interval of natural gas consumption from 0 to 141 m3per hour increase in the length of the coherent jet in the beginning is very steep, and then becomes smooth. In the interval of natural gas consumption from 0 to 28 m3/hour length of the coherent jet is increased from 229 to 711 mm, i.e., at 482 mm (more than 200%). With an additional increase of natural gas consumption at 113 m3per hour (from 28 to 141 m3/hour) length of the coherent jet is increased from 711 to 1168 mm, i.e., at 457 mm (approximately 65%).

In addition, in Fig.5 shows the results obtained with the preferred embodiment of the invention and which also serve to illustrate the unexpected nature of the invention. Repeating the above method is obavljale inert gas, which in this example was nitrogen gas, so that the total flow of gaseous fuel and inert gas was equal to 141 m3/hour. The results of this test group is shown in Fig. 5 as curve C. As you can see, the results when using the invention with the addition of inert gas is essentially similar to the results obtained without the use of an inert gas. This shows that the regulation of the length of the coherent jet by controlling the flow of gaseous fuel is not just the physical impact caused by the change in the flow rate of the fluid flowing near the main gas stream, as a similar regulation is achieved when the flow rate of the fluid flowing near the main stream of the gas remains constant (curve B).

The results, represented by the curve in Fig.5, serve not only to demonstrate the unexpected nature of the invention, but also to show the example of the preferred alternative embodiment of the invention. At low costs gaseous fuel openings through which the produced fuel could become clogged or otherwise become clogged. Through the use of added inert gas from kazooba the mu possible contamination without prejudice to any regulation of the length of the coherent jet, as is shown in the test results shown in Fig.5.

When implementing this invention can use any suitable number of coherent jets. When in the case of industrial applications use more than one coherent jet method according to this invention can be used to change the length of one or any number or all of the coherent jets. For example, in a basic oxygen furnace, which uses four coherent jet, you can change the flow of gaseous fuel to all the injectors to simultaneously change the length of all coherent jets.

Thus, by using this invention, it is possible to quickly and accurately change the length of the coherent jet without having to do any change in equipment or need to change the gas flow rate is added to the coherent jet. Although the invention is described in detail with reference to certain preferred ways of its implementation, the experts in this field recognize that within the essence and scope of the claims there are other variants of embodiment of the invention. For example, if the gaseous fuel is applied sprayed liquid, it can also be used sresi (A) submission of main gas main gas stream at a flow rate of the main gas the flow of gaseous fuel at a first flow rate of the gaseous fuel and the combustion of gaseous fuel with the oxidant to form a sheath of flame, coaxially to the main gas stream, to create a coherent jet having a first length, characterized in that after this exercise (B) submission of main gas main gas stream at a flow rate of the main gas flow of the gaseous fuel at a second flow rate of gaseous fuel, which is different from the first flow rate of the gaseous fuel and the combustion of gaseous fuel with the oxidant to form a sheath of flame, coaxially to the main gas stream, to create a coherent jet having a second length, which is different from the first length.

2. The method according to p. 1, characterized in that the second flow of gaseous fuel is greater than the first flow rate of the gaseous fuel and the second length is greater than the first length.

3. The method according to p. 1, characterized in that the second flow of gaseous fuel is less than the first flow rate of the gaseous fuel and the second length less than the first length.

4. The method according to p. 1, characterized in that as the main gas using gaseous oxygen.

5. The method according to p. 1, otlichayuschih.

6. The method according to p. 5, characterized in that as the inert gas using gaseous nitrogen.

7. The method according to p. 5, characterized in that the inert gas is fed with the high flow of inert gas, the amount of flow of the inert gas and the second flow of gaseous fuel, essentially equal to the first flow of gaseous fuel.

8. The method according to p. 1, characterized in that the inert gas at the first flow rate of the inert gas is added to the gaseous fuel delivered at the first flow rate of fuel gas, and an inert gas at a second flow rate of the inert gas is added to the gaseous fuel is supplied at a second flow rate of gaseous fuel.

9. The method according to p. 1, characterized in that use a multitude of coherent jets and consumption of gaseous fuels for each of these coherent jets of change to change the length of each of the coherent jet.

10. The method according to p. 1, characterized in that the oxidant for combustion of gaseous fuel for the formation of a sheath of flame serves on the stage (A) with a flow rate, which is essentially the same flow rate at which it is served at the stage (B).

 

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