JP6793250B2 - Oxygen fuel combustor and oxygen and fuel injection method - Google Patents

Description

The present invention relates to an oxygen fuel combustor and an oxygen and fuel injection method, and more specifically, a unique oxygen injection structure and a unique oxygen injection method are visually visible through high-speed flow of oxygen and fuel. The present invention relates to an oxygen fuel combustor capable of forming a wide combustion reaction zone and allowing high-temperature exhaust gas to flow into a flame so that the exhaust gas reacts with the flame, and an oxygen and fuel injection method.

In general, industrial combustors used in steelmaking and molten metal forging processes use fuel and air, which is an oxidizer, to form a flame, and the temperature of the formed flame raises the temperature of the material to be heated. It is intended to be useful for the convenience of the post-treatment process and is installed in an industrial furnace. Such a conventional industrial combustor is used in an industrial furnace having a limited space, supplies fuel from a fuel nozzle, and supplies air, which is an oxidizing agent installed separately from the fuel nozzle. There is also a problem that a large amount of pollutants are generated and energy is excessively consumed due to the configuration in which air at room temperature or air is preheated to about 500 ° C. through an air preheater (RECUPERATOR).

On the other hand, in the case of a heat storage type combustor that uses waste heat of exhaust gas to preheat air to 1000 ° C or higher, the fuel saving effect is similar to that of a general oxygen combustor, but the equipment is complicated and maintenance is required. Not only is the investment cost of the equipment high, but it also has a problem that the installation area becomes large because it is 10 times or more larger than a general oxygen combustor.

Oxygen combustors are used in some special fields, but they have a high adiabatic flame of 800 ° C or higher compared to the flames of general combustors that use general air and fuel, but they have a short high temperature. There is a problem that it induces problems such as defective material due to local heating of the heating material and damage to the burner itself.

And, despite the high energy saving effect of 30% or more and the low exhaust gas emission of 80% or more for general combustors, there is a problem that a large amount of nitrogen oxides (NOx) are generated, so that it is common. This is a fact that cannot be used in ordinary industrial furnaces.

As a background technique, there is Korean Patent Publication No. 2003-0061336 (title of invention: burner for decomposing nonflammable substances, published on 2003.07.18).

An object of the present invention has been devised to solve conventional problems, in which a wide combustion reaction zone is formed through a unique oxygen injection structure and a unique oxygen injection method, and a high-temperature exhaust gas is produced. It is an object of the present invention to provide an oxygen fuel combustor capable of inflowing into a flame and the exhaust gas reacting with the flame, and a method for injecting oxygen and fuel.

According to a preferred embodiment for achieving the object of the present invention described above, the oxygen fuel combustor according to the present invention is coupled to the heating furnace so that fuel and oxygen are supplied to the heating furnace, and the fuel and oxygen are supplied. The discharge body exposed inside the heating furnace, the central penetrating portion formed through the central portion of the discharging body, and each other along the circumferential direction with respect to the virtual circle centered on the central penetrating portion. The oxygen penetrating portion formed through the discharge body in a separated state, the discharge head unit including the coupling flange provided on the outer peripheral surface of the discharge body for coupling with the heating furnace, and the heating furnace. Of the fuel and primary oxygen, the central supply unit coupled to the central penetration so that at least the fuel is supplied, and the oxygen bound to the oxygen penetration so that the secondary oxygen is supplied to the heating furnace. At least of the fuel and primary oxygen coupled to the central supply unit or the central penetration and supplied by the central supply unit so that it is exposed inside the heating furnace at the central penetration. The central nozzle unit from which fuel is injected and the secondary oxygen that is coupled to the oxygen supply unit or the oxygen penetration portion so as to be exposed inside the heating furnace at the oxygen penetration portion and supplied by the oxygen supply unit. The oxygen nozzle unit includes an oxygen nozzle unit in which oxygen is injected, and the oxygen nozzle unit has an accommodating cone portion formed by being depressed so as to have a smaller diameter from the inlet, and a fuel injection direction and secondary oxygen in front of the discharge head unit. Includes an inclined injection hole portion formed through the accommodating cone portion so as to incline toward the outlet so that the injection directions of the two intersect.

Here, the oxygen nozzle unit includes an inclination display unit provided at the outlet and indicating an inclination direction of the inclination injection hole portion.

Here, the injection angle of oxygen injected in the inclined injection hole portion is 2.5 degrees or more and 30 degrees or less.

Here, the oxygen penetrating portion includes a first oxygen penetrating portion formed through the first virtual circle centered on the central penetrating portion in a state of being separated from each other along the circumferential direction, and the first virtual penetrating portion. The oxygen supply unit is coupled to the first oxygen penetrating portion, including a second oxygen penetrating portion formed through the second virtual circle larger than the circle in a state of being separated from each other along the circumferential direction. A first oxygen supply unit to be generated and a second oxygen supply unit coupled to the second oxygen penetration portion are included, and the oxygen nozzle unit is exposed to the inside of the heating furnace at the first oxygen penetration portion. The first oxygen nozzle unit coupled to the first oxygen supply unit or the first oxygen penetration portion, and the second oxygen supply unit so as to be exposed to the inside of the heating furnace at the second oxygen penetration portion. Alternatively, it includes a second oxygen nozzle unit coupled to the second oxygen penetrating portion.

Here, the injection angle of the secondary oxygen injected by the first oxygen nozzle unit is larger than the injection angle of the secondary oxygen injected by the second oxygen nozzle unit.

Here, the amount of exhaust gas flowing into the flame is adjusted by at least one of the injection interval of the secondary oxygen, the injection angle of the secondary oxygen, and the collision point between the fuel and the secondary oxygen.

Here, the central supply unit supplies any one of the fuel and the primary oxygen to the heating furnace, and any one of the fuel and the primary oxygen supplied to the heating furnace is transferred. A first central supply unit including one central supply pipe was coupled to the central penetration to supply the heating furnace with another one of fuel and primary oxygen, and the first central supply pipe was inserted. In the state, the central nozzle unit includes the fuel supplied to the heating furnace and the second central supply unit including the second central supply pipe to which the other one in the primary oxygen is transferred, and the central nozzle unit is the first central. A central nozzle portion formed through a first injection port that is coupled to a supply pipe and ejects a fuel transferred through the first central supply pipe, and a central nozzle portion that protrudes from the outer peripheral surface of the central nozzle portion to supply the second central supply. It includes a nozzle flange portion through which a second injection port is formed, which is coupled to a pipe and injects a fluid transferred by a second central supply pipe.

Here, the second injection port is inclined toward the nozzle flange portion so that the injection direction of the fluid transferred by the second central supply pipe intersects the injection direction of the fluid transferred by the first central supply pipe. It is formed through as if it were.

Here, the central supply unit supplies a primary fuel to the heating furnace, and includes a first central supply pipe including a first central supply pipe to which the primary fuel supplied to the heating furnace is transferred, and the central penetration portion. Includes a second central supply pipe to which the secondary fuel is supplied to the heating furnace and the secondary fuel supplied to the heating furnace is transferred in a state where the first central supply pipe is inserted. A center including a second central supply unit, the central nozzle unit is coupled to the first central supply pipe, and a first injection port through which the primary fuel transferred in the first central supply pipe is injected is formed through. A nozzle portion and a second injection port that protrudes from the outer peripheral surface of the central nozzle portion and is coupled to the second central supply pipe and injects secondary fuel transferred through the second central supply pipe are formed through. Includes nozzle flange.

Here, the second injection port is inclined toward the nozzle flange portion so that the injection direction of the secondary fuel transferred by the second central supply pipe intersects the injection direction of oxygen supplied by the oxygen supply unit. It is formed through as if it were.

Here, the second injection port is provided so as to have a 1: 1 correspondence with the oxygen nozzle unit.

Here, two to four oxygen penetrating portions are arranged so as to be separated from each other along the circumferential direction.

The oxygen and fuel injection method according to the present invention is a temperature comparison in which a temperature measurement step of measuring the internal temperature of the heating furnace and a temperature comparison comparing the internal temperature of the heating furnace measured through the temperature measurement step with a predetermined automatic ignition temperature. When the internal temperature of the heating furnace is smaller than the predetermined automatic ignition temperature according to the step and the temperature comparison step, the first flame forming step of injecting primary oxygen and secondary oxygen into the fuel and the temperature comparison step Correspondingly, when the internal temperature of the heating furnace is equal to or higher than the predetermined automatic ignition temperature, the injection amount of primary oxygen is included in the second flame forming step of injecting only secondary oxygen into the fuel, and in the first flame forming step. Is 30% or less of the total oxygen injection amount, and the secondary oxygen injection amount is 70% or more of the total oxygen injection amount.

Here, the first flame forming stage includes a fuel injection stage in which fuel is injected in front of the discharge head unit through a central nozzle unit provided in the center of the discharge head unit, and fuel injection in front of the discharge head unit. A concentrated injection stage in which primary oxygen is injected in front of the discharge head unit through the central nozzle unit and a fuel injection direction in front of the discharge head unit intersect so as to form a fuel-rich area intersecting the directions. Secondary oxygen is introduced in front of the discharge head unit through the oxygen nozzle unit provided in the discharge head unit in a state of being separated by the central nozzle unit so as to form an oxygen reaction area in a portion far from the fuel-rich area. Including a reaction injection step of injecting.

Here, the reaction injection step is separated by the central nozzle unit so as to intersect the fuel injection direction in front of the discharge head unit and form a first oxygen reaction area at a portion far from the fuel rich area. In this state, the first reaction injection step of injecting secondary oxygen in front of the discharge head unit through the first oxygen nozzle unit provided in the discharge head unit intersects with the fuel injection direction in front of the discharge head unit. Then, in a state of being separated by the central nozzle unit so as to form a second oxygen reaction area in a portion far from the fuel-rich area, the discharge head unit is separated from the second oxygen nozzle unit provided in the discharge head unit. The first oxygen reaction area is a portion closer to the second oxygen reaction area in front of the discharge head unit, including at least one of the second reaction injection steps of injecting secondary oxygen forward. The first oxygen nozzle unit is closer to the central nozzle unit than the second oxygen nozzle unit.

Here, the second flame forming step includes the fuel injection step and the reaction injection step in the first flame forming step, excluding the concentrated injection step.

The oxygen and fuel injection method according to the present invention is a temperature comparison in which a temperature measurement step of measuring the internal temperature of the heating furnace and a temperature comparison comparing the internal temperature of the heating furnace measured through the temperature measurement step with a predetermined automatic ignition temperature. When the internal temperature of the heating furnace is lower than the predetermined automatic ignition temperature according to the stage and the temperature comparison stage, a first flame formation in which at least one of the primary fuel and the secondary fuel is injected into oxygen is formed. Second flame formation that injects at least one of the primary fuel and the secondary fuel into oxygen when the internal temperature of the heating furnace is equal to or higher than the predetermined automatic ignition temperature according to the step and the temperature comparison step. Including the step, at least one of the first flame forming step and the second flame forming step is a primary where the injection direction of the primary fuel and the injection direction of oxygen intersect in front of the discharge head unit. Two or more where the injection direction of the secondary fuel and the injection direction of oxygen intersect between the oxygen reaction area where the fuel and oxygen react and the discharge head unit and the oxygen reaction area, and the secondary fuel and oxygen react. Form at least one of the additional reaction areas of.

Here, the first flame forming step is an oxygen reaction area formed in front of the discharge head unit intersecting the injection direction of the primary fuel and an additional reaction area formed crossing the injection direction of the secondary fuel. In a state of being separated by a central nozzle unit provided in the central portion of the discharge head unit so that at least one of them is formed, in front of the discharge head unit through an oxygen nozzle unit provided in the discharge head unit. A first fuel injection step that includes a reaction injection step of injecting oxygen and injecting a primary fuel into the oxygen reaction area through the central nozzle unit, and a second fuel injection step of injecting a secondary fuel into the additional reaction area through the central nozzle unit. Includes at least one of the fuel injection stages.

Here, the discharge head is separated by the central nozzle unit so that the reaction injection step intersects the injection direction of the primary fuel in front of the discharge head unit to form a first oxygen reaction region. The first reaction injection stage in which oxygen is injected in front of the discharge head unit through the first oxygen nozzle unit provided in the unit, and the second oxygen reaction area intersecting the injection direction of the primary fuel in front of the discharge head unit. At least one of the second reaction injection steps in which oxygen is injected in front of the discharge head unit through the second oxygen nozzle unit provided in the discharge head unit while being separated by the central nozzle unit so as to form. The first oxygen reaction area is formed in front of the discharge head unit and closer to the second oxygen reaction area than the second oxygen reaction area, and the first oxygen nozzle unit is located in the center of the second oxygen nozzle unit. Close to the nozzle unit.

Further, the second flame forming stage is injected in the fuel adjustment stage of injecting the primary fuel into the oxygen reaction area through the central nozzle unit or injecting the secondary fuel into the additional reaction area, and the fuel adjustment stage. It comprises an oxygen regulation step of injecting oxygen into at least one of the oxygen reaction area or the additional reaction area by the fuel.

Here, when fuel and oxygen are injected at at least one of the first flame forming stage and the second flame forming stage, the fuel injected in front of the discharge head unit by the central nozzle unit. The injection speed of is 50% or less of the injection speed of oxygen injected by the oxygen nozzle unit.

Here, when fuel and oxygen are injected at at least one of the first flame forming stage and the second flame forming stage, the injection speed of oxygen injected by the oxygen nozzle unit is 100 m / s. It is ~ 400 m / s.

According to the oxygen fuel combustor and the oxygen and fuel injection method according to the present invention, a wide combustion reaction zone is formed through a unique oxygen injection structure and a unique oxygen injection method, and high-temperature exhaust gas flows into the flame. The exhaust gas can then react with the flame. In addition, nitrogen oxides can be significantly reduced through a decrease in the adiabatic flame temperature, and the material inside the heating furnace can be heated substantially uniformly. Further, the size of the heating furnace used in the steelmaking process or the steelmaking process can be minimized, and the size of the oxygen fuel combustor can be reduced.

Further, the present invention can facilitate the collision between fuel and oxygen, maximize the flameless combustion effect caused by the collision flame, and stabilize the combustion reaction. Further, when the temperature inside the heating furnace becomes higher than the automatic ignition temperature through the high-speed flow of oxygen and fuel, the collision between the fuel and oxygen can be improved, and the flameless combustion reaction can be easily realized.

Further, the present invention stabilizes the coupling of the oxygen nozzle unit, and the fuel injected by the central nozzle unit and the oxygen injected by the oxygen nozzle unit can stably collide with each other in front of the discharge head unit, so that a flame can be generated. Can be stably induced to occur. In addition, the collision point of oxygen and combustion is separated in front of the discharge head unit to protect the discharge head unit, the central nozzle unit, and the oxygen nozzle unit from the high temperature flame of oxygen so that they have high durability. It is possible to achieve a high fuel saving effect by using oxygen. Further, a flat flame can be formed through the structure of the central nozzle unit and the number and arrangement structure of the oxygen nozzle units, and the length of the flame can be adjusted while forming a general flame. In addition, it is not compulsory, and the amount of high-temperature exhaust gas flowing into the flame can be adjusted by allowing the high-temperature exhaust gas to stably flow into the flame without a separate device.

In addition, the present invention can induce multi-stage combustion of oxygen, facilitate ignition and retention of flame, and reduce nitrogen oxide emissions. In addition, the entrainment effect for inflowing high-temperature exhaust gas can be maximized by utilizing the correlation between the injection speed of fuel and oxygen, and the recirculation effect of exhaust gas can be maximized in the flame. Can be done.

It is a perspective view which shows the oxygen fuel combustor according to 1st Example of this invention. It is sectional drawing which shows the coupling state of the oxygen fuel combustor according to 1st Example of this invention. It is a figure which shows the arrangement state of the central nozzle unit and the oxygen nozzle unit in the oxygen fuel combustor according to 1st Embodiment of this invention. It is a figure which shows the deformed arrangement state of the central nozzle unit and the oxygen nozzle unit in the oxygen fuel combustor according to 1st Embodiment of this invention. It is a figure which shows the central nozzle unit in the oxygen fuel combustor according to 1st Example of this invention. It is a figure which shows the oxygen nozzle unit in the oxygen fuel combustor according to 1st Example of this invention. It is a figure which shows the injection method of oxygen and fuel according to 1st Example of this invention. It is a figure which shows the reaction state of oxygen and fuel by 1st Example of this invention. It is a perspective view which shows the oxygen fuel combustor according to 2nd Example of this invention. It is sectional drawing which shows the coupling state of the oxygen fuel combustor according to 2nd Example of this invention. It is a figure which shows the arrangement state of the central nozzle unit and the oxygen nozzle unit in the oxygen fuel combustor according to the 2nd Example of this invention. It is a figure which shows the deformed arrangement state of the central nozzle unit and the oxygen nozzle unit in the oxygen fuel combustor according to the 2nd Embodiment of this invention. It is a figure which shows the injection method of oxygen and fuel by the 2nd Example of this invention. It is a figure which shows the reaction state of oxygen and fuel by the 2nd Example of this invention. It is a perspective view which shows the oxygen fuel combustor according to the 3rd Example of this invention. It is sectional drawing which shows the coupling state of the oxygen fuel combustor according to the 3rd Example of this invention. It is a figure which shows the arrangement state of the central nozzle unit and the oxygen nozzle unit in the oxygen fuel combustor according to the 3rd Example of this invention. It is a figure which shows the central nozzle unit in the oxygen fuel combustor by the 2nd Example of this invention. It is a figure which shows the injection method of oxygen and fuel according to the 3rd Example of this invention. It is a figure which shows the reaction state of oxygen and fuel by the 3rd Example of this invention.

Hereinafter, examples of the oxygen fuel combustor and the oxygen and fuel injection method according to the present invention will be described with reference to the attached drawings. At this time, the present invention is not limited or limited by the examples. Further, in explaining the present invention, specific explanations for known functions and configurations may be omitted in order to clarify the gist of the present invention.

FIG. 1 is a perspective view showing an oxygen fuel combustor according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view showing a coupled state of the oxygen fuel combustor according to the first embodiment of the present invention, and FIG. FIG. 4 is a diagram showing an arrangement state of a central nozzle unit and an oxygen nozzle unit in the oxygen fuel combustor according to the first embodiment of the present invention, and FIG. 4 is a diagram showing a central nozzle unit and oxygen in the oxygen fuel combustor according to the first embodiment of the present invention. FIG. 5 is a diagram showing a deformed arrangement state of the nozzle unit, FIG. 5 is a diagram showing a central nozzle unit in the oxygen fuel combustor according to the first embodiment of the present invention, and FIG. 6 is a diagram showing a central nozzle unit according to the first embodiment of the present invention. FIG. 7 is a diagram showing an oxygen nozzle unit in an oxygen fuel combustor, FIG. 7 is a diagram showing a method of injecting oxygen and fuel according to the first embodiment of the present invention, and FIG. 8 is a diagram showing oxygen according to the first embodiment of the present invention. It is a figure which shows the reaction state of a fuel.

Hereinafter, the oxygen fuel combustor according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8. The oxygen fuel combustor according to the first embodiment of the present invention supplies oxygen and fuel to the heating furnace, and includes a discharge head unit 10, a central supply unit 20, an oxygen supply unit 30, a central nozzle unit 40, and oxygen. Includes a nozzle unit 50.

The discharge head unit 10 is coupled to the heating furnace so that fuel and oxygen are supplied to the heating furnace. The discharge head unit 10 includes a discharge body 11 exposed inside the heating furnace so that fuel and oxygen are supplied, a central penetration portion 13 formed through the central portion of the discharge body 11, and a central penetration portion 13. An oxygen penetrating portion 14 formed through the discharge body in a state of being separated from each other along the circumferential direction with respect to the virtual circle C as the center, and a coupling installed on the outer peripheral surface of the discharge body 11 and coupled to the heating furnace. The flange 12 and the like can be included.

Therefore, with the discharge body 11 inserted into the coupling portion of the heating furnace, the coupling flange 12 is fixedly coupled to the heating furnace by using a separate fastening member, so that the front portion of the discharge body 11 is inside the heating furnace. Can be exposed from.

At this time, two to four oxygen penetrating portions 14 can be arranged in a state of being separated from each other along the circumferential direction. As a result, the inflow of high-temperature exhaust gas into the flame can be maximized and the emission of nitrogen oxide NOx can be reduced. Here, when the number of oxygen penetrating portions 14 is 1 or 5 or more, the inflow of high-temperature exhaust gas into the flame is reduced, and a general flame is formed.

Further, the central penetrating portion 13 is made to coincide with the injection direction of the fuel, and the oxygen penetrating portion 14 is formed parallel to the central penetrating portion 13 to reduce the installation area of the central supply unit 20 and the oxygen supply unit 30 so as to use the fuel. The supply of oxygen can be smoothed.

The central supply unit 20 supplies at least fuel of fuel and primary oxygen to the heating furnace. The central supply unit 20 is coupled to the central penetration portion 13. The central supply unit 20 is coupled to a first central supply unit 210 that supplies any one of fuel and primary oxygen to the heating furnace and a central penetration portion 13, and is coupled to the heating furnace in fuel and primary oxygen. It includes a second central supply unit 220 that supplies the other one. As an example, when fuel is supplied by the first central supply unit 210, primary oxygen is supplied by the second central supply unit 220. As another example, when the primary oxygen is supplied by the first central supply unit 210, the fuel is supplied by the second central supply unit 220.

The first central supply unit 210 includes a first central supply pipe 213 to which any one of the fuel supplied to the heating furnace and the primary oxygen is transferred. A first central supply chamber 212 containing any one of fuel and primary oxygen can be connected to the first central supply pipe 213. The first central supply chamber 212 may be provided with a first central supply port 211 that supplies any one of fuel and primary oxygen. Therefore, any one of the fuel and the primary oxygen is accommodated in the first central supply chamber 212 from an external storage container (not shown) through the first central supply port 211, and then passes through the first central supply pipe 213. The injection is made from the central nozzle unit 40.

The second central supply unit 220 includes a second central supply pipe 223 coupled to the central penetration 13 to transfer the fuel supplied to the heating furnace and the other one of the primary oxygen. The second central supply pipe 223 can be inserted into the central penetrating portion 13. A second central supply chamber 222, which houses the fuel and the other one of the primary oxygen, can be connected to the second central supply pipe 223. The second central supply chamber 222 may be provided with a second central supply port 221 that supplies the other one of fuel and primary oxygen. Therefore, the other one of the fuel and the primary oxygen is accommodated in the second central supply chamber 222 from the external storage container (not shown) through the second central supply port 221 and then through the second central supply pipe 223. The injection is made from the central nozzle unit 40.

Here, the first central supply pipe 213 is inserted into the second central supply pipe 223 and the second central supply chamber 222 to reduce the installation area of the central nozzle unit 40 and smoothly supply fuel and primary oxygen. can do.

The oxygen supply unit 30 is coupled to the oxygen penetration portion 14 so that secondary oxygen is supplied to the heating furnace. The oxygen supply unit 30 can include an oxygen supply pipe 303 that is coupled to the oxygen penetration portion 14 to transfer secondary oxygen supplied to the heating furnace. The oxygen supply pipe 303 can be inserted into the oxygen penetration portion 14. Two to four oxygen supply pipes 303 are provided according to the number of oxygen penetrating portions 14. An oxygen supply chamber 302 in which secondary oxygen is housed can be connected to the oxygen supply pipe 303. In another expression, the oxygen supply chamber 302 can have an oxygen supply pipe 303 branched corresponding to the oxygen penetration portion 14. The oxygen supply chamber 302 can be provided with an oxygen supply port 301 for supplying secondary oxygen. Therefore, the secondary oxygen is accommodated in the oxygen supply chamber 302 from an external storage container (not shown) through the oxygen supply port 301, and then injected from the oxygen nozzle unit 50 through the oxygen supply pipe 303. Here, the second central supply pipe 223 is inserted through the oxygen supply chamber 302 to reduce the installation area of the oxygen supply unit 30 and facilitate the supply of secondary oxygen.

Although not shown, the oxygen supply chamber 302 may include or be formed through a second central supply chamber 222. Further, the first central supply chamber 212 can be incorporated or formed through the second central supply chamber 222.

The central nozzle unit 40 is coupled to the central supply unit 20 so as to be exposed inside the heating furnace at the central penetration portion 13. In the central nozzle unit 40, the first central supply pipe 213 and the second central supply pipe 223 can be coupled so as to be exposed inside the heating furnace at the central penetration portion 13. The central nozzle unit 40 can be coupled to the central penetrating portion 13. At this time, the inside of the central penetrating portion 13 can be partitioned according to the connecting structure of the first central supply pipe 213 and the second central supply pipe 223. Further, at least the fuel of the fuel supplied by the central supply unit 20 and the primary oxygen is injected into the central nozzle unit 40. In the first embodiment of the present invention, the central nozzle unit 40 can inject the fuel supplied by the central supply unit 20 and the primary oxygen, respectively.

The central nozzle unit 40 includes a central nozzle portion 41 coupled to the first central supply pipe 213 and a nozzle flange portion 42 protruding from the outer peripheral surface of the central nozzle portion 41 and coupled to the second central supply pipe 223. Can be done.

A first injection port 411 on which the fluid transferred by the first central supply pipe 213 is injected can be formed through the central nozzle portion 41. The first injection port 411 can be formed through the central portion of the central nozzle portion. The penetrating direction of the first injection port 411 substantially coincides with the moving direction of the fluid transferred by the first central supply pipe 213, and can substantially coincide with the fuel injection direction. A central cone portion 411a formed by being depressed so as to have a smaller diameter from the inlet can be provided on the inlet side of the first injection port 411. Therefore, an oxygen reaction region R2 in which the fuel and the secondary oxygen react at the collision point between the fuel and the secondary oxygen can be formed. Further, the edge of the central nozzle portion 41 may include a first coupling portion 412 for coupling with the first central supply pipe 213.

A second injection port 421 in which the fluid transferred by the second central supply pipe 223 is injected can be formed through the nozzle flange portion 42. Two or more of the second injection ports 421 can be formed through the nozzle flange portion 42 so as to be separated from each other along the edge of the nozzle flange portion 42. Here, the second injection port 421 is inclined at the nozzle flange portion 42 so that the injection direction of the fluid transferred by the second central supply pipe 223 intersects the injection direction of the fluid transferred by the first central supply pipe 213. It can be formed through like this. In another expression, the penetrating direction of the second injection port 421 may intersect with the penetrating direction of the first injection port 411. The second injection port 421 can be formed in a form in which two or more are provided along the periphery of the first injection port 411 and surround the first injection port 411. Therefore, a fuel-rich region R1 in which the fuel and the primary oxygen react at the collision point between the fuel and the primary oxygen can be formed. Further, the edge of the nozzle flange portion 42 may include a second coupling portion 422 for coupling with the second central supply pipe 223.

As an example, when fuel is supplied at the first injection port 411, primary oxygen is supplied at the second nozzle. As another example, when primary oxygen is supplied at the first injection port 411, fuel is supplied at the second injection port 421. The flame configuration by such a primary oxygen and fuel injection method has a double reverse diffusion flame configuration, and has a higher radiant heat transfer effect than the fuel supplied at the first injection port 411. Will be played.

The oxygen nozzle unit 50 is coupled to the oxygen supply unit 30 so as to be exposed inside the heating furnace at the oxygen penetration portion 14. The oxygen nozzle unit 50 can be coupled with an oxygen supply pipe 303 so as to be exposed inside the heating furnace at the oxygen penetration portion 14. Two to four oxygen nozzle units 50 can be provided according to the number of oxygen penetrating portions 14 and the number of oxygen supply pipes 303. The oxygen nozzle unit 50 can be coupled to the oxygen penetration portion 14.

Further, the oxygen nozzle unit 50 is injected with oxygen supplied by the oxygen supply unit 30. Two or more oxygen nozzle units 50 can be provided according to the number of oxygen penetrating portions 14.

At this time, the oxygen nozzle unit 50 is recessed from the inlet so that the diameter becomes smaller, and the accommodating cone portion 502 is formed so that the fuel injection direction and the secondary oxygen injection direction intersect in front of the discharge head unit 10. An inclined injection hole portion 503 formed through the accommodating cone portion 502 so as to incline toward the outlet can be included. In another expression, the penetration direction of the inclined injection hole portion 503 may intersect with the penetration direction of the first injection port 411. Therefore, an oxygen reaction region R2 in which the fuel and the secondary oxygen react at the collision point between the fuel and the secondary oxygen can be formed.

The inlet of the oxygen nozzle unit 50 is defined as the portion where oxygen flows into the oxygen nozzle unit 50, and the outlet of the oxygen nozzle unit 50 is defined as the portion where the oxygen flowing into the inside of the oxygen nozzle unit 50 is discharged. can do.

In particular, the injection angle A of oxygen injected in the inclined injection hole portion 503 can be expressed as the inclined angle of the inclined injection hole portion 503 or the injection angle of the secondary oxygen, and can be expressed as the injection direction of the fuel and the injection of the secondary oxygen. The angle at which the inclined injection hole portion 503 is tilted by the oxygen nozzle unit 50 is shown with reference to the fuel injection direction so that the directions intersect. The injection angle A of oxygen injected in the inclined injection hole portion 503 can be 2.5 degrees or more and 30 degrees or less.

Further, the oxygen nozzle unit 50 may include an inclination display unit 504 installed at the outlet to indicate the inclination direction of the inclination injection hole portion 503. When the oxygen nozzle unit 50 is coupled to the oxygen supply unit 30 or the oxygen penetrating portion 14, the tilt display unit 504 is the oxygen nozzle unit at the oxygen penetrating portion 14 so that the injection direction of the secondary oxygen and the injection direction of the fuel intersect. 50 can be fixed in position.

When the oxygen nozzle unit 50 is fixedly positioned at the oxygen penetration portion 14 through the tilt display portion 504, the tilt display portion 504, the center of the tilt injection hole portion 503, and the center of the first injection port 411 of the central nozzle unit 40 are arranged in a straight line. As a result, the oxygen injected by the oxygen nozzle unit 50 can collide with the fuel injected at the first injection port 411 or the second injection port 421.

Further, the edge of the oxygen nozzle unit 50 may include a nozzle coupling portion 501 for coupling with the oxygen supply pipe 303.

The amount of exhaust gas flowing into the flame in the oxygen fuel combustor according to the first embodiment of the present invention is within the secondary oxygen injection interval, the secondary oxygen injection angle A, and the collision point between the fuel and the secondary oxygen. It can be adjusted by at least one of.

First, as the injection interval of secondary oxygen becomes wider, the amount of exhaust gas flowing into the flame increases. Further, as the injection interval of the secondary oxygen becomes narrower, the amount of exhaust gas flowing into the flame can be reduced.

Second, as the injection angle A of the secondary oxygen becomes smaller, the amount of exhaust gas flowing into the flame increases. Further, as the injection angle A of the secondary oxygen increases, the amount of exhaust gas flowing into the flame can be reduced. At this time, the injection angle A of the secondary oxygen can be limited to 2.5 degrees or more and 30 degrees or less. As a result, the amount of exhaust gas flowing into the flame can be maximized by limiting the injection angle A of the secondary oxygen to an allowable range. For example, if the injection angle A of the secondary oxygen is smaller than the allowable range in order to increase the amount of exhaust gas flowing into the flame, the collision flame due to the collision between the fuel and the secondary oxygen is not formed, and the MILD (Moderate and Intense Low oxygen Dilution) The combustion effect is reduced. Further, when the injection angle A of the secondary oxygen is smaller than the allowable range, the collision and reaction between the fuel and the secondary oxygen become far away and the combustion reaction does not occur, or the incomplete combustion increases and carbon monoxide CO May increase. Further, when the injection angle A of the secondary oxygen becomes larger than the allowable range, the position of the collision flame becomes close to the discharge head unit 10, and the discharge head unit 10, the central nozzle unit 40, and the oxygen nozzle unit 50 are damaged by the collision flame. Or, the collision flame may go back to the central supply unit 20 or the oxygen supply unit 30.

Third, when the collision point between the fuel and the secondary oxygen is far from the discharge head unit 10, the amount of exhaust gas flowing into the flame can be increased. Further, when the collision point between the fuel and the secondary oxygen approaches the discharge head unit 10, the amount of exhaust gas flowing into the flame can be reduced. If the collision point deviates from the predetermined tolerance, the desired flame cannot be transmitted to the material inside the heating furnace. That is, when the collision point between the fuel and the secondary oxygen deviates from the predetermined allowable range, the collision flame cannot be formed between the material inside the heating furnace and the discharge head unit 10. Further, when the collision point between the fuel and the secondary oxygen deviates from the predetermined allowable range, the collision flame approaches the discharge head unit 10, and the collision flame causes the discharge head unit 10, the central nozzle unit 40, and the elementary nozzle unit 50 to move. It may be damaged or the collision flame may go back to the central supply unit 20 or the oxygen supply unit 30.

Although not shown, the oxygen fuel combustor according to the first embodiment of the present invention may further include a control unit. The control unit adjusts the injection amount of fuel and oxygen according to the internal temperature T of the heating furnace. The operation of the control unit will be described in the method of injecting oxygen and fuel according to the first embodiment of the present invention.

Hereinafter, the method of injecting oxygen and fuel according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8. The method of injecting oxygen and fuel according to the first embodiment of the present invention is a method of injecting oxygen and fuel into the inside of the heating furnace, and as shown in FIG. 8, the temperature measurement stage S1, the temperature comparison stage S2, and the first method. It includes one flame forming step S3 and a second flame forming step S4. The method of injecting oxygen and fuel according to the first embodiment of the present invention will be described by the method of injecting oxygen and fuel into the inside of the heating furnace through the oxygen fuel combustor according to the first embodiment of the present invention.

In the temperature measurement step S1, the internal temperature T of the heating furnace is measured. In the temperature measurement step S1, the internal temperature T of the heating furnace can be measured by various temperature measuring means.

The temperature comparison step S2 compares the internal temperature T of the heating furnace measured through the temperature measurement step S1 with the predetermined automatic ignition temperature T0. In the temperature comparison step S2, various control units can compare the internal temperature T of the heating furnace with the predetermined automatic ignition temperature T0.

The first flame forming step S3 injects primary oxygen and secondary oxygen into the fuel when the internal temperature T of the heating furnace is smaller than the predetermined automatic ignition temperature T0 according to the comparison result of the temperature comparison step S2. Here, the default automatic ignition temperature T0 can be 800 degrees Celsius to 900 degrees Celsius when the fuel is liquefied natural gas. In the first flame forming step S3, the injection amount of primary oxygen becomes 30% or less of the total oxygen injection amount, and the injection amount of secondary oxygen becomes 70% or more of the total oxygen injection amount. The first flame forming step S3 includes a fuel injection step S11, a concentrated injection step S12, and a reaction injection step S13. Here, the order of the first flame forming step S3 is not limited, but the order of the first flame forming step S3 can be adjusted for the formation of the flame.

The fuel injection stage S11 in the first flame forming stage S3 injects fuel in front of the discharge head unit 10 through the central nozzle unit 40 provided in the center of the discharge head unit 10. In the concentrated injection step S12 in the first flame forming step S3, primary oxygen is injected in front of the discharge head unit 10 through the central nozzle unit 40. Here, the injection amount of the primary oxygen is set to 30% or less of the total injection amount. Through the concentrated injection step S12, the primary oxygen and the fuel react with each other in front of the discharge head unit 10 at the front of the discharge head unit 10 and intersect with the fuel injection direction to form the fuel concentrated area R1. The reaction injection step S13 in the first flame forming step S3 injects secondary oxygen in front of the discharge head unit 10 through the oxygen nozzle unit 50 provided in the discharge head unit 10 in a state of being separated from the central nozzle unit 40. Here, the injection amount of secondary oxygen is set to 70% or more of the total injection amount. Through the reaction injection step S13, the secondary oxygen and the fuel react with each other in front of the discharge head unit 10 at the front of the discharge head unit 10 and intersect with the fuel injection direction to form an oxygen reaction area R2 in a portion far from the fuel rich area R1. In other words, a fuel-rich region R1 is formed between the discharge head unit 10 and the oxygen reaction region R2. The fuel-rich area R1 and the oxygen reaction area R2 can partially overlap or be separated from each other.

Therefore, in the fuel-rich area R1, it reacts with the primary oxygen, and the unburned fuel finally reacts with the secondary oxygen, thereby facilitating ignition and holding of the flame and reducing the emission of nitrogen oxides. it can.

In the second flame forming step S4, when the internal temperature T of the heating furnace is equal to or higher than the predetermined automatic ignition temperature T0 according to the result of the temperature comparison step S2, only secondary oxygen is injected into the fuel. In the second flame formation step S4, the injection amount of secondary oxygen becomes 100% of the total oxygen injection amount. The second flame forming step S4 includes a fuel injection step S11-1 and a reaction injection step S13-1 in the first flame forming step S3, except for the concentrated injection step S12.

The fuel injection step S11-1 in the second flame forming step S4 injects fuel in front of the discharge head unit 10 through the central nozzle unit 40 provided in the center of the discharge head unit 10. The reaction injection step S13-1 in the second flame forming step S4 injects secondary oxygen in front of the discharge head unit 10 through the oxygen nozzle unit 50 provided in the discharge head unit 10 in a state of being separated from the central nozzle unit 40. .. Here, the injection amount of secondary oxygen is set to 100% of the total injection amount. Through the reaction injection step S13-1, the fuel injection direction and the secondary oxygen injection direction intersect in front of the discharge head unit 10 and the secondary oxygen reacts with the fuel, and only the oxygen reaction area R2 without the fuel rich area R1. To form. In another expression, an oxygen reaction area is formed in front of the discharge head unit 10 through an oxygen nozzle unit 50 and separated by a predetermined distance corresponding to an injection angle A of secondary oxygen.

Therefore, in the second flame formation stage S4, the secondary oxygen and the fuel collide with each other only in the oxygen reaction area R2 to generate a flame, so that the entrainment effect for the inflow of the exhaust gas can be maximized. The recirculation effect of the exhaust gas can be maximized with respect to the exhaust gas flowing into the flame. Further, in the second flame formation step S4, a flameless combustion reaction that is difficult to distinguish with the naked eye is performed.

When the secondary oxygen is injected by the oxygen nozzle unit 50 through at least one of the first flame forming step S3 and the second flame forming step S4, there is a heating furnace between the fuel and the secondary oxygen. The high temperature exhaust gas generated inside flows into the flame. As a result, the recirculation area R3 is formed at the portion where the exhaust gas flows into the flame. Such a phenomenon represents the effect of recirculating the exhaust gas, and the emission of nitrogen oxides can be sharply reduced. In particular, in the first embodiment of the present invention, it is not necessary to forcibly circulate the exhaust gas generated inside the heating furnace, let the exhaust gas flow into the flame through a separate circulation device, or mix with oxygen. As a structural feature of the oxygen fuel combustor according to the first embodiment of the present invention, the exhaust gas recirculation effect can be exhibited.

In the reaction of at least one of the secondary oxygen and the fuel in the first flame forming step S3 and the second flame forming step S4, two oxygen nozzle units 50 are provided in the two oxygen penetrating portions 14, and a virtual circle is provided. Since it is separated in the circumferential direction with respect to C, the fuel and the secondary oxygen collide with each other in the oxygen reaction area R2 formed at a predetermined distance in front of the discharge head unit 10. Thereby, the flame formed by the collision of the fuel and the secondary oxygen can form a fan-shaped flat flame having a thin thickness and a wide width. Therefore, by forming a flat flame, one oxygen fuel combustor has the effect of heating a wide area. Further, in the reaction between the secondary oxygen and the fuel, three to four oxygen nozzle units 50 are provided in the three to four oxygen penetration portions 14 in a ratio of 1: 1 in the circumferential direction with respect to the virtual circle C. Since they are separated at equal intervals, the fuel and the secondary oxygen collide with each other in the oxygen reaction area R2 formed at a predetermined distance in front of the discharge head unit 10. Thereby, the flame formed by the collision of the fuel and the secondary oxygen forms a general flame and can be used in a general heating field.

Further, when fuel and oxygen are injected at at least one of the first flame forming stage S3 and the second flame forming stage S4, the fuel injected in front of the head unit 10 discharged by the central nozzle unit 40. The injection speed of the secondary oxygen can be limited to 50% or less of the injection speed of the secondary oxygen injected by the oxygen nozzle unit. Such a difference in injection speed between fuel and secondary oxygen can maximize the amount of hot exhaust gas flowing into the flame. Further, when fuel and oxygen are injected at at least one of the first flame forming stage S3 and the second flame forming stage S4, the injection speed of the secondary oxygen injected by the oxygen nozzle unit 50 is 100 m /. It can be limited to s to 400 m / s. Such a limitation of the injection rate of secondary oxygen can maximize the amount of hot exhaust gas flowing into the flame.

For example, when the injection rate of secondary oxygen is lower than the limit range, the inflow of high-temperature exhaust gas can be reduced and the amount of nitrogen oxides generated can be increased. Further, when the injection speed of the secondary oxygen becomes lower than the limit range, the injection speed of the fuel increases relatively, and the flame reaction may not occur. Further, when the injection speed of the secondary oxygen becomes higher than the limit range, the injection speed of the fuel is relatively reduced, the inflow amount of the exhaust gas is increased, and the flame reaction may not occur.

9 is a perspective view showing the oxygen fuel combustor according to the second embodiment of the present invention, FIG. 10 is a cross-sectional view showing the coupled state of the oxygen fuel combustor according to the second embodiment of the present invention, and FIG. 11 is a cross-sectional view. FIG. 12 is a diagram showing an arrangement state of a central nozzle unit and an oxygen nozzle unit in the oxygen fuel combustor according to the second embodiment of the present invention, and FIG. 12 is a diagram showing the central nozzle unit and oxygen in the oxygen fuel combustor according to the second embodiment of the present invention. It is a figure which shows the deformed arrangement state of a nozzle unit, FIG. 13 is a figure which shows the oxygen and fuel injection method by the 2nd Example of this invention, and FIG. 14 is a figure which shows the oxygen by the 2nd Example of this invention. It is a figure which shows the reaction state of fuel.

Hereinafter, the oxygen combustor according to the second embodiment of the present invention will be described with reference to FIGS. 9 to 14. The oxygen fuel combustor according to the second embodiment of the present invention supplies oxygen and fuel to the heating furnace, and includes a discharge head unit 10, a central supply unit 20, an oxygen supply unit 30, a central nozzle unit 40, and oxygen. Includes a nozzle unit 50. The oxygen fuel combustor according to the second embodiment of the present invention has the same reference numerals as those of the oxygen fuel combustor according to the first embodiment of the present invention, and the description thereof will be omitted.

In the oxygen fuel combustor according to the second embodiment of the present invention, the oxygen nozzle unit 50 is formed in multiple stages. As a result, the oxygen penetrating portion 14 includes a first oxygen penetrating portion 15 and a second oxygen penetrating portion 16, and the oxygen supply unit 30 includes a first oxygen supply unit 310 and a second oxygen supply unit 320. The oxygen nozzle unit 50 can include a first oxygen nozzle unit 510 and a second oxygen nozzle unit 520.

The first oxygen penetrating portion 15 is formed penetrating in a state of being separated from each other along the circumferential direction with respect to the first virtual circle C1 centered on the central penetrating portion 13. The second oxygen penetrating portion 16 is formed penetrating in a state of being separated from each other along the circumferential direction with respect to the second virtual circle C2 larger than the first virtual circle C1. Here, the first oxygen penetrating portion 15 may be provided with two to four, and the second oxygen penetrating portion 16 may be provided with two to four. In the second embodiment of the present invention, the first oxygen penetrating portion 15 and the second oxygen penetrating portion 16 may be formed in the same number. At this time, the first oxygen penetrating portion 15 may be arranged on a virtual line connecting the central penetrating portion 13 and the second oxygen penetrating portion 16, or may be arranged outside the virtual line. Although not shown, the number of the first oxygen penetrating portions 15 and the number of the second oxygen penetrating portions 16 may be different from each other.

The first oxygen supply unit 310 is coupled to the first oxygen penetration portion 15. The first oxygen supply unit 310 can include a first oxygen supply pipe 313 that is coupled to the first oxygen penetration portion 15 and to which the secondary oxygen supplied to the heating furnace is transferred. The first oxygen supply pipe 313 can be inserted into the first oxygen penetration portion 15. The first oxygen supply pipe 313 is provided with two to four corresponding to the number of the first oxygen penetration portions 15. A first oxygen supply chamber 312 in which secondary oxygen is housed can be connected to the first oxygen supply pipe 313. In other words, in the first oxygen supply chamber 312, the first oxygen supply pipe 313 can be branched corresponding to the first oxygen penetration portion 15. The first oxygen supply chamber 312 can be provided with a first oxygen supply port 311 that supplies secondary oxygen. Therefore, the secondary oxygen is stored in the first oxygen supply chamber 312 from an external storage container (not shown) through the first oxygen supply port 311 and then through the first oxygen supply pipe 313 to be the first oxygen nozzle unit. It is injected at 510. Here, the second central supply pipe 223 is inserted through the first oxygen supply chamber 312 to reduce the installation area of the first oxygen supply unit 310 and facilitate the supply of secondary oxygen.

The second oxygen supply unit 320 is coupled to the second oxygen penetrating portion 16. The second oxygen supply unit 320 can include a second oxygen supply pipe 323 that is coupled to the second oxygen penetration portion 16 and transfers the secondary oxygen supplied to the heating furnace. The second oxygen supply pipe 323 can be inserted into the second oxygen penetration portion 16. Two to four second oxygen supply pipes 323 are provided according to the number of second oxygen penetration portions 16. A second oxygen supply chamber 322 in which secondary oxygen is housed can be connected to the second oxygen supply pipe 323. In another expression, a second oxygen supply pipe 323 can be branched into the second oxygen supply chamber 322 corresponding to the second oxygen penetration portion 16. The second oxygen supply chamber 322 is provided with a second oxygen supply port 321 for supplying secondary oxygen. Therefore, the secondary oxygen is stored in the second oxygen supply chamber 322 from an external storage container (not shown) through the second oxygen supply port 321 and then through the second oxygen supply pipe 323 in the second oxygen nozzle unit 520. Make it jet. Here, the second central supply pipe 223 is inserted through the second oxygen supply chamber 322 to reduce the installation area of the second oxygen supply unit 320 and facilitate the supply of secondary oxygen. Further, the second oxygen supply chamber 322 can be arranged between the second central supply chamber 222 and the first oxygen supply chamber 312.

Although not shown, the first oxygen supply chamber 312 can be incorporated in the second oxygen supply chamber 322. Further, the second central supply chamber 222 can be incorporated in the first oxygen supply chamber 312. Further, the first central supply chamber 212 can be incorporated in the second central supply chamber 222.

The first oxygen nozzle unit 510 is coupled to the first oxygen supply unit 310 or the first oxygen penetration portion 15 so as to be exposed inside the heating furnace at the first oxygen penetration portion 15. As in the first embodiment of the present invention, the first oxygen nozzle unit 510 includes a housing cone portion 502 and an inclined injection hole portion 503, and at least one of the nozzle coupling portion 501 and the inclined display unit 504. Or one can be included. The second oxygen nozzle unit 520 is coupled to the second oxygen supply unit 320 or the second oxygen penetrating portion 16 so as to be exposed inside the heating furnace at the second oxygen penetrating portion 16. The second oxygen nozzle unit 520 includes a housing cone portion 502 and an inclined injection hole portion 503, as in the first embodiment of the present invention, and is at least one of the nozzle coupling portion 501 and the inclined display unit 504. Or one can be included. When the oxygen nozzle unit 50 is formed in multiple stages as described above, the injection angle of the secondary oxygen injected by the first oxygen nozzle unit 510 is the injection angle of the secondary oxygen injected by the second oxygen nozzle unit 520. By making it larger than the injection angle, the oxygen reaction area R2 can include the first oxygen reaction area R21 and the second oxygen reaction area R22. In the first oxygen reaction area R21, the injection direction of the secondary oxygen injected by the first oxygen nozzle unit 510 intersects the injection direction of the fuel in front of the discharge head unit 10, and the secondary oxygen reacts with the fuel. In the second oxygen reaction area R22, the injection direction of the secondary oxygen injected by the second oxygen nozzle unit 520 intersects the injection direction of the fuel in front of the first oxygen reaction area R21, and the secondary oxygen reacts with the fuel. ..

Although not shown, the oxygen fuel combustor according to the second embodiment of the present invention may further include a control unit. The control unit adjusts the injection amount of fuel and oxygen according to the internal temperature T of the heating furnace. The operation of the control unit will be described in the method of injecting oxygen and fuel according to the second embodiment of the present invention.

Hereinafter, the method of injecting oxygen and fuel according to the second embodiment of the present invention will be described with reference to FIGS. 9 to 14. The method of injecting oxygen and fuel according to the second embodiment of the present invention is a method of injecting oxygen and fuel into the inside of the heating furnace, and as shown in FIG. 13, the temperature measurement step S1, the temperature comparison step S2, and the second. It includes one flame forming step S3 and a second flame forming step S4. The method of injecting oxygen and fuel according to the second embodiment of the present invention will be described by the method of injecting oxygen and fuel into the inside of the heating furnace through the oxygen fuel combustor according to the second embodiment of the present invention.

The temperature measurement step S1 measures the internal temperature T of the heating furnace. The temperature measurement step S1 can measure the internal temperature T of the heating furnace through various temperature measuring means.

The temperature comparison step S2 compares the internal temperature T of the heating furnace measured through the temperature measurement step S1 with the predetermined automatic ignition temperature T0. The temperature comparison step S2 can compare the internal temperature T of the heating furnace with the predetermined automatic ignition temperature T0 through various types of control units (not shown).

The first flame forming step S3 injects primary oxygen and secondary oxygen into the fuel when the internal temperature T of the heating furnace is smaller than the predetermined automatic ignition temperature T0 according to the comparison result of the temperature comparison step S2. Here, the default automatic ignition temperature T0 can be 800 degrees Celsius to 900 degrees Celsius when the fuel is liquefied natural gas (LNG, Liquid Natural Gas). In the first flame formation step S3, the injection amount of the primary oxygen is 30% or less of the total oxygen injection amount, and the injection amount of the secondary oxygen is 70% or more of the total oxygen injection amount. The first flame forming step S3 includes a fuel injection step S21 and a concentrated injection step S22, and further includes at least one of the first reaction injection step S23 and the second reaction injection step S24. Here, the order of the first flame forming step S3 is not limited, but the order of the first flame forming step S3 can be adjusted for the formation of the flame.

The fuel injection step S21 in the first flame forming step S3 injects fuel in front of the discharge head unit 10 through the central nozzle unit 40 provided in the center of the discharge head unit 10. In the concentrated injection step S22 in the first flame forming step S3, primary oxygen is injected in front of the discharge head unit 10 through the central nozzle unit 40. Here, the injection amount of the primary oxygen is set to 30% or less of the total injection amount. Through the concentrated injection step S22, the primary oxygen and the fuel react with each other in front of the discharge head unit 10 at the front of the discharge head unit 10 and intersect with the fuel injection direction to form the fuel concentrated area R1. In the first reaction injection step S23 in the first flame forming step S3, secondary oxygen is supplied to the front of the discharge head unit 10 through the first oxygen nozzle unit 510 provided in the discharge head unit 10 in a state of being separated from the central nozzle unit 40. Inject. Through the first reaction injection step S23, the fuel injection direction and the secondary oxygen injection direction intersect in front of the discharge head unit 10, and the secondary oxygen reacts with the fuel, and the first oxygen reaction occurs in a portion far from the fuel-rich area R1. Form area R21. In other words, a fuel-rich region R1 is formed between the discharge head unit 10 and the first oxygen reaction region R21. Here, the fuel-rich area R1 and the first oxygen reaction area R21 can partially overlap or be separated from each other. In the second reaction injection step S24 in the first flame forming step S3, secondary oxygen is supplied to the front of the discharge head unit 10 through the second oxygen nozzle unit 520 provided in the discharge head unit 10 in a state of being separated by the central nozzle unit 40. Inject. Through the second reaction injection step S24, the fuel injection direction and the secondary oxygen injection direction intersect in front of the discharge head unit 10, and the secondary oxygen reacts with the fuel, and the second oxygen reaction occurs in a portion far from the fuel-rich area R1. Form area R22. In other words, a first oxygen reaction region R21 and a fuel-rich region R1 can be formed between the discharge head unit 10 and the second oxygen reaction region R22. Here, the fuel-rich area R1, the first oxygen reaction area R21, and the second oxygen reaction area R22 can be partially overlapped or separated from each other.

Therefore, the fuel-rich area R1, the first oxygen reaction area R21, and the second oxygen reaction area R22 can be sequentially formed in front of the discharge head unit 10. Then, depending on the combustion reaction conditions, at least one of the first oxygen reaction area R21 and the second oxygen reaction area R22 can be formed.

Here, the injection amount of the secondary oxygen injected in the first reaction injection step S23 in the first flame formation step S3 and the injection amount of the secondary oxygen injected in the second reaction injection step S24 in the first flame formation step S3. The sum of should be 70% or more of the total injection amount. When secondary oxygen is injected by both the first oxygen nozzle unit 510 and the second oxygen nozzle unit 520, the injection amount of the secondary oxygen or the injection speed of the secondary oxygen injected by the first oxygen nozzle unit 510 is the second. The recirculation effect of the exhaust gas can be maximized by making it equal to or smaller than the injection amount of the secondary oxygen injected by the 2 oxygen nozzle unit 520 or the injection speed of the secondary oxygen.

Therefore, it reacts with the primary oxygen in the fuel-rich area R1, and the unburned fuel finally reacts with the secondary oxygen in at least one of the first oxygen reaction area R21 and the second oxygen reaction area R22. This facilitates ignition and retention of flames and reduces nitrogen oxide emissions.

When secondary oxygen is injected by at least one of the first oxygen nozzle unit 510 and the second oxygen nozzle unit 520 through the first flame forming step S3, heating is performed between the fuel and the secondary oxygen. The high temperature exhaust gas generated inside the furnace flows into the flame. As a result, the recirculation area R3 is formed at the portion where the exhaust gas flows into the flame. Such a phenomenon represents the effect of recirculating the exhaust gas, and the emission of nitrogen oxides can be sharply reduced. In particular, in the second embodiment of the present invention, it is not necessary to forcibly circulate the exhaust gas generated inside the heating furnace, let the exhaust gas flow into the flame through a separate circulation device, or mix with oxygen. As a structural feature of the oxygen fuel combustor according to the second embodiment of the present invention, the exhaust gas recirculation effect can be obtained.

In the second flame forming step S4, when the internal temperature T of the heating furnace is equal to or higher than the predetermined automatic ignition temperature T0 according to the result of the temperature comparison step S2, only secondary oxygen is injected into the fuel. In particular, in the second flame formation step S4, the injection amount of secondary oxygen becomes 100% of the total oxygen injection amount.

The second flame forming step S4 includes the fuel injection step S21-1 except for the concentrated injection step S22 of the first flame forming step S3, and is in the first reaction injection step S23-1 and the second reaction injection step S24-1. Further includes at least one of.

The fuel injection step S21-1 in the second flame forming step S4 injects fuel in front of the discharge head unit 10 through the central nozzle unit 40 provided in the center of the discharge head unit 10.

The first reaction injection step S23-1 in the second flame forming step S4 is secondary to the front of the discharge head unit 10 through the first oxygen nozzle unit 510 provided in the discharge head unit 10 in a state of being separated from the central nozzle unit 40. Inject oxygen. Through the first reaction injection step S23-1, the injection direction of the fuel and the injection direction of the secondary oxygen intersect in front of the discharge head unit 10 and the secondary oxygen reacts with the fuel, and the primary oxygen without the fuel-rich region R1. A reaction region R21 is formed. In another expression, the first oxygen reaction region R21 is formed in front of the discharge head unit 10 at a predetermined distance corresponding to the injection angle of the secondary oxygen through the first oxygen nozzle unit 510.

The second reaction injection step S24-1 in the second flame forming step S4 is secondary to the front of the discharge head unit 10 through the first oxygen nozzle unit 510 provided in the discharge head unit 10 in a state of being separated from the central nozzle unit 40. Inject oxygen. Through the second reaction injection step S24-1, the injection direction of the fuel and the injection direction of the secondary oxygen intersect in front of the discharge head unit 10 and the secondary oxygen reacts with the fuel, and the secondary oxygen without the fuel-rich region R1. A reaction region R22 is formed. In another expression, the second oxygen reaction region R22 is formed in front of the discharge head unit 10 by being separated by a predetermined distance corresponding to the injection angle of the secondary oxygen through the first oxygen nozzle unit 510. Therefore, a first oxygen reaction region R21 can be formed between the discharge head unit 10 and the second oxygen reaction region R22. Here, the fuel-rich region R1, the first oxygen reaction region R21, and the second oxygen reaction region R22 can partially overlap or be separated from each other.

Therefore, the first oxygen reaction area R21 and the second oxygen reaction area R22 can be sequentially formed in front of the discharge head unit 10. Then, depending on the combustion reaction conditions, at least one of the first oxygen reaction area R21 and the second oxygen reaction area R22 can be formed.

Here, the first oxygen reaction area R21 is formed in front of the discharge head unit 10 and closer to the second oxygen reaction area R22, and the first oxygen nozzle unit 510 is closer to the central nozzle unit 40 than the first oxygen nozzle unit 510. It is formed in a close part.

Further, the injection amount of the secondary oxygen injected in the first reaction injection step S23-1 in the second flame formation step S4 and the secondary oxygen injected in the second reaction injection step S24-1 in the second flame formation step S4. The sum of the injection amounts of is 100% of the total injection amount. When secondary oxygen is injected by both the first oxygen nozzle unit 510 and the second oxygen nozzle unit 520, the injection amount of the secondary oxygen or the injection speed of the secondary oxygen injected by the second oxygen nozzle unit 520 is the second. 1 The recirculation effect of the exhaust gas can be maximized by making it equal to or larger than the injection amount of the secondary oxygen injected by the oxygen nozzle unit 510 or the injection speed of the secondary oxygen.

Therefore, in the second flame formation stage S4, the secondary oxygen and the fuel collide with each other in at least one of the first oxygen reaction area R21 and the second oxygen reaction area R22 to generate a flame, so that the exhaust gas is exhausted. The entrainment effect for the inflow of gas can be maximized, and the recirculation effect for the exhaust gas flowing into the flame can be maximized. Further, in the second flame formation step S4, a flameless combustion reaction that is difficult to distinguish with the naked eye is performed.

In the reaction between the secondary oxygen and the fuel in the first flame forming step S3 or the second flame forming step S4, in order to heat a relatively close portion in front of the discharge head unit 10, the first oxygen nozzle unit 510 and the center Secondary oxygen and fuel are injected through the nozzle unit 40 to form a relatively short flame. Further, in order to heat a relatively distant portion in front of the discharge head unit 10, secondary oxygen and fuel are injected through the first oxygen nozzle unit 510 and the central nozzle unit 40 to form a relatively long flame. can do. Further, in order to heat the entire surface in front of the discharge head unit 10, secondary oxygen and fuel are injected through the first oxygen nozzle unit 510, the first oxygen nozzle unit 510, and the central nozzle unit 40 to reduce the flame formation area. Can be expanded.

In the reaction of at least one of the secondary oxygen and the fuel in the first flame forming step S3 and the second flame forming step S4, two first oxygen nozzle units 510 are provided in the two first oxygen penetrating portions 15. , Two first oxygen nozzle units 510 are provided in the two second oxygen penetration portions 16, and the central nozzle unit 40, the first oxygen nozzle unit 510 and the first oxygen nozzle unit 510 are arranged in a straight line, so that the discharge can be performed. The fuel and secondary oxygen collide with each other in at least one of the first oxygen reaction area R21 and the second oxygen reaction area R22 formed in front of the head unit 10 at a predetermined distance. Thereby, the flame formed by the collision of the fuel and the secondary oxygen can form a fan-shaped flat flame having a thin thickness and a wide width. Therefore, by forming a flat flame, one oxygen fuel combustor has the effect of heating a wide area.

Further, in the reaction between the secondary oxygen and the fuel, two first oxygen nozzle units 510 are provided in the two first oxygen penetrating portions 15, and two first oxygen nozzle units 510 are provided in the two second oxygen penetrating portions 16. When the virtual line connecting the central nozzle unit 40 and the first oxygen nozzle unit 510 intersects the virtual line connecting the central nozzle unit 40 and the first oxygen nozzle unit 510, the discharge head unit 10 is provided. The fuel and the secondary oxygen collide with each other in at least one of the first oxygen reaction area R21 and the second oxygen reaction area R22 formed at a predetermined distance in front of the above. Thereby, the flame formed by the collision of the fuel and the secondary oxygen forms a general flame and can be used in a general heating field. Further, in the reaction between the secondary oxygen and the fuel, three to four first oxygen nozzle units 510 are provided in the three to four first oxygen penetrating portions 15 in a 1: 1 correspondence, and a first virtual circle is provided. Separated at equal intervals in the circumferential direction with respect to C1, three to four first oxygen nozzle units 510 are provided in three to four second oxygen penetrating portions 16 in a 1: 1 correspondence, and a second virtual Since they are separated at equal intervals in the circumferential direction with respect to the circle C2, at least one of the first oxygen reaction area R21 and the second oxygen reaction area R22 formed separated in front of the discharge head unit 10 by a predetermined distance. Fuel and secondary oxygen will collide with each other. Thereby, the flame formed by the collision of the fuel and the secondary oxygen forms a general flame and can be used in a general heating field.

Further, when fuel and oxygen are injected at at least one of the first flame forming stage S3 and the second flame forming stage S4, the fuel injected in front of the head unit 10 discharged by the central nozzle unit 40. The injection speed of the above can be limited to 50% or less of the injection speed of the secondary oxygen injected by the first oxygen nozzle unit 510 or the first oxygen nozzle unit 510. Such a difference in injection speed between fuel and secondary oxygen can maximize the amount of exhaust gas flowing into the flame. Further, when fuel and oxygen are injected at at least one of the first flame forming stage S3 and the second flame forming stage S4, they are injected by the first oxygen nozzle unit 510 or the second oxygen nozzle unit 520. The injection rate of secondary oxygen can be limited to 100 m / s to 400 m / s. Such a limitation of the injection rate of secondary oxygen can maximize the amount of hot exhaust gas flowing into the flame.

For example, when the injection rate of secondary oxygen is lower than the limit range, the inflow of high-temperature exhaust gas can be reduced and the amount of nitrogen oxides generated can be increased. Further, when the injection speed of the secondary oxygen becomes lower than the limit range, the injection speed of the fuel increases relatively, and the flame reaction may not occur. Further, when the injection speed of the secondary oxygen becomes higher than the limit range, the injection speed of the fuel is relatively reduced, the inflow amount of the exhaust gas is increased, and the flame reaction may not occur.

Although not shown, the oxygen fuel combustor according to the second embodiment of the present invention may further include a control unit. The control unit adjusts the injection amount of fuel and oxygen according to the internal temperature T of the heating furnace. The operation of the control unit will be described in the method of injecting oxygen and fuel according to the second embodiment of the present invention.

FIG. 15 is a perspective view showing the oxygen fuel combustor according to the third embodiment of the present invention, FIG. 16 is a cross-sectional view showing the coupled state of the oxygen fuel combustor according to the third embodiment of the present invention, and FIG. FIG. 18 is a diagram showing an arrangement state of a central nozzle unit and an oxygen nozzle unit in the oxygen fuel combustor according to the third embodiment of the present invention, and FIG. 18 shows a central nozzle unit in the oxygen fuel combustor according to the second embodiment of the present invention. FIG. 19 is a diagram showing a method of injecting oxygen and fuel according to a third embodiment of the present invention, and FIG. 20 is a diagram showing a reaction state of oxygen and fuel according to a third embodiment of the present invention.

Hereinafter, the oxygen fuel combustor according to the third embodiment of the present invention will be described with reference to FIGS. 15 to 20. The oxygen fuel combustor according to the third embodiment of the present invention supplies oxygen and fuel to the heating furnace, and includes a discharge head unit 10, a central supply unit 20, an oxygen supply unit 30, a central nozzle unit 40, and oxygen. Includes a nozzle unit 50.

The same reference numerals are given to the oxygen fuel combustors according to the third embodiment of the present invention and the same configurations as the oxygen fuel combustors according to the first or second embodiment of the present invention, and the description thereof will be omitted.

The oxygen fuel combustor according to the third embodiment of the present invention is formed so that only fuel is injected by the central nozzle unit 40.

As a result, the central supply unit 20 includes a first central supply unit 210 that supplies the primary fuel to the heating furnace and a second central supply unit 220 that supplies the secondary fuel to the heating furnace, and the central nozzle unit 40 is central. The nozzle portion 41 and the nozzle flange portion 42 can be included. The sum of the primary fuel and the secondary fuel should be 100% of the total fuel injection amount. The same fuel can be used as the primary fuel and the secondary fuel.

The first central supply unit 210 includes a first central supply pipe 213 to which the primary fuel supplied to the heating furnace is transferred. A first central supply chamber 212 containing primary fuel can be connected to the first central supply pipe 213. The first central supply chamber 212 may be provided with a first central supply port 211 for supplying primary fuel. Therefore, the primary fuel is stored in the first central supply chamber 212 from an external storage container (not shown) through the first central supply port 211, and then injected by the central nozzle unit 40 through the first central supply pipe 213. To.

The second central supply unit 220 includes a second central supply pipe 223 coupled to the central penetration portion 13 to transfer the secondary fuel supplied to the heating furnace. The second central supply pipe 223 can be inserted into the central penetrating portion 13. A second central supply chamber 222 in which the secondary fuel is housed can be connected to the second central supply pipe 223. The second central supply chamber 222 may be provided with a second central supply port 221 for supplying secondary fuel. Therefore, the secondary fuel is stored in the second central supply chamber 222 from an external storage container (not shown) through the second central supply port 221 and then injected by the central nozzle unit 40 through the second central supply pipe 223. To do so. Here, the first central supply pipe 213 is inserted and supported in the second central supply pipe 223 and the second central supply chamber 222, the size of the central nozzle unit 40 is reduced, and the primary fuel and the secondary fuel are charged. The supply can be smoothed.

The central nozzle unit 40 is coupled to the central supply unit 20 so as to be exposed inside the heating furnace at the central penetration portion 13. In the central nozzle unit 40, the first central supply pipe 213 and the second central supply pipe 223 can be coupled so as to be exposed inside the heating furnace at the central penetration portion 13. The central nozzle unit 40 can be coupled to the central penetrating portion 13. At this time, the inside of the central penetrating portion 13 can be partitioned according to the connecting structure of the first central supply pipe 213 and the second central supply pipe 223.

Further, the central nozzle unit 40 injects the primary fuel supplied by the first central supply unit 210 and the secondary fuel supplied by the second central supply unit 220. In the third embodiment of the present invention, the central nozzle unit 40 can inject the primary fuel supplied by the first central supply unit 210 and the secondary fuel supplied by the second central supply unit 220, respectively. The central nozzle unit 40 includes a central nozzle portion 41 coupled to the first central supply pipe 213 and a nozzle flange portion 42 protruding from the outer peripheral surface of the central nozzle portion 41 and coupled to the second central supply pipe 223. Can be done.

A first injection port 411 on which the primary fuel transferred by the first central supply pipe 213 is injected can be formed through the central nozzle portion 41. The first injection port 411 can be formed through the central portion of the central nozzle portion 41. The penetrating direction of the first injection port 411 substantially coincides with the moving direction of the primary fuel transferred by the first central supply pipe 213, and can substantially coincide with the injection direction of the primary fuel. A central cone portion 411a formed by being depressed so as to have a smaller diameter from the inlet can be provided on the inlet side of the first injection port 411. Therefore, an oxygen reaction region R2 in which the secondary fuel and oxygen react at the collision point between the secondary fuel and oxygen can be formed. Further, the edge of the central nozzle portion 41 may include a first coupling portion 412 for coupling with the first central supply pipe 213.

A second injection port 421 in which the secondary fuel transferred by the second central supply pipe 223 is injected can be formed through the nozzle flange portion 42. Two or more of the second injection ports 421 can be formed through the nozzle flange portion 42 so as to be separated from each other along the edge of the nozzle flange portion 42.

Here, the second injection port 421 is a nozzle so that the injection direction of the secondary fuel transferred by the second central supply pipe 223 intersects the injection direction of oxygen transferred by the oxygen supply pipe 303 of the oxygen supply unit 30. It can be formed through the flange portion 42 so as to be inclined. In particular, the second injection port 421 can be arranged on a virtual line connecting the first injection port 411 and the inclined injection hole portion 503, corresponding to the oxygen nozzle unit 50. In another expression, the penetrating direction of the second injection port 421 may intersect with the penetrating direction of the inclined injection hole portion 503. More specifically, the second injection port 421 and the oxygen nozzle unit 50 can be formed in the same quantity. Therefore, an additional reaction area R4 in which the secondary fuel and oxygen react at the collision point between the secondary fuel and oxygen can be formed. Further, the edge of the nozzle flange portion 42 may include a second coupling portion 422 for coupling with the second central supply pipe 223.

Although not shown, in the third embodiment of the present invention, the oxygen penetrating portion 14 includes the first oxygen penetrating portion 15 and the second oxygen penetrating portion 16 as in the second embodiment of the present invention, and the oxygen The supply unit 30 includes a first oxygen supply unit 310 and a second oxygen supply unit 320 as in the second embodiment of the present invention, and the oxygen nozzle unit 50 is as in the second embodiment of the present invention. , The first oxygen nozzle unit 510, and the second oxygen nozzle unit 520 can be included.

The oxygen fuel combustor according to the third embodiment of the present invention may further include a control unit. The control unit adjusts the injection amount of fuel and oxygen according to the internal temperature T of the heating furnace. The operation of the control unit will be described in the method of injecting oxygen and fuel according to the third embodiment of the present invention.

Hereinafter, the method of injecting oxygen and fuel according to the third embodiment of the present invention will be described with reference to FIGS. 15 to 20. The method of injecting oxygen and fuel according to the third embodiment of the present invention is a method of injecting oxygen and fuel into the inside of the heating furnace, and as shown in FIG. 19, the temperature measurement step S1, the temperature comparison step S2, and the second. It includes one flame forming step S3 and a second flame forming step S4. The method of injecting oxygen and fuel according to the third embodiment of the present invention will be described by the method of injecting oxygen and fuel into the inside of the heating furnace through the oxygen fuel combustor according to the third embodiment of the present invention.

In the third embodiment of the present invention, at least one of the first flame forming step S3 and the second flame forming step S4 is the injection direction of the primary fuel and the injection direction of oxygen in front of the discharge head unit 10. The injection direction of the secondary fuel and the injection direction of oxygen intersect between the discharge head unit 10 and the oxygen reaction area R2, and the secondary fuel and the oxygen reaction area R2 where the primary fuel and oxygen react with each other. It forms at least one of two or more additional reaction areas R4 with which oxygen reacts. Two or more additional reaction areas R4 can overlap or be separated from each other.

The temperature measurement step S1 measures the internal temperature of the heating furnace. The temperature measurement step S1 can measure the internal temperature T of the heating furnace through various forms of temperature measuring means (not shown).

The temperature comparison step S2 compares the internal temperature T of the heating furnace measured through the temperature measurement step S1 with the predetermined automatic ignition temperature T0. The temperature comparison step S2 can compare the internal temperature T of the heating furnace with the predetermined automatic ignition temperature T0 through various types of control units (not shown).

In the first flame forming step S3, when the internal temperature T of the heating furnace is smaller than the predetermined automatic ignition temperature T0 according to the comparison result of the temperature comparison step S2, at least one of the primary fuel and the secondary fuel is added to oxygen. Inject one. The default autoignition temperature T0 can be between 800 degrees Celsius and 900 degrees Celsius when the fuel is liquefied natural gas.

The first flame forming step S3 includes a reaction injection step S33, further including at least one of a first fuel injection step S31 and a second fuel injection step S32. Here, the order of the first flame forming step S3 is not limited, but the order of the first flame forming step S3 can be adjusted for the formation of the flame.

In the reaction injection step S33 in the first flame forming step S3, the discharge head unit 10 is separated from the central nozzle unit 40 provided in the central portion of the discharge head unit 10 through the oxygen nozzle unit 50 provided in the discharge head unit 10. Inject oxygen forward. An oxygen reaction region R2 formed by intersecting the injection direction of the primary fuel and the injection direction of oxygen is formed in front of the discharge head unit 10 through the reaction injection step S33, and the injection direction of the secondary fuel and the injection direction of oxygen are formed. At least one of the reaction areas R4 is formed. Here, the oxygen reaction area R2 and the additional reaction area R4 can be partially overlapped or separated from each other. Although not shown, when the oxygen injection nozzle 50 is formed in multiple stages in the third embodiment of the present invention, the reaction injection stage S33 is the first reaction injection stage and the second reaction injection stage as in the second embodiment of the present invention. At least one of the reaction injection steps can be included.

The first reaction injection step is performed on the discharge head unit 10 in a state separated from the central nozzle unit 40 so as to intersect the injection direction of the primary fuel in front of the discharge head unit 10 to form the first oxygen reaction region R21. Oxygen is injected in front of the discharge head unit 10 through the first oxygen nozzle unit 510 provided. The second reaction injection step is performed on the discharge head unit 10 in a state separated from the central nozzle unit 40 so as to intersect the injection direction of the primary fuel in front of the discharge head unit 10 to form the second oxygen reaction region R22. Oxygen is injected in front of the discharge head unit 10 through the second oxygen nozzle unit 520 provided.

Here, the first oxygen reaction area R21 is formed in front of the discharge head unit 10 and closer to the second oxygen reaction area R22. Further, the first oxygen nozzle unit 510 is formed closer to the central nozzle unit 40 than the second oxygen nozzle unit 520. In other words, the second oxygen nozzle unit 520 is formed farther from the central nozzle unit 40 than the first oxygen nozzle unit 510.

The first fuel injection step S31 in the first flame forming step S3 injects the primary fuel into the oxygen reaction area R2 through the central nozzle unit 40. The primary fuel is injected in front of the discharge head unit 10 through the central nozzle unit 40 provided in the center of the discharge head unit 10. Through the first fuel injection step S31, the injection direction of the primary fuel and the injection direction of oxygen intersect in front of the discharge head unit 10 and the primary fuel reacts with oxygen to form an oxygen reaction area R2.

The second fuel injection step S32 in the first flame forming step S3 injects the secondary fuel into the additional reaction area R4 through the central nozzle unit 40. Through the second fuel injection step S32, the injection direction of the secondary fuel and the injection direction of oxygen intersect, and the secondary fuel and oxygen react with each other to form an additional reaction area R4.

Therefore, in the additional reaction area R4, the secondary fuel reacts with oxygen, and the unburned oxygen finally reacts with the primary fuel in the oxygen reaction area R2, thereby facilitating ignition and holding of the flame, and nitrogen oxides. Emissions can be reduced.

When the central nozzle unit 40 injects 50% each of the primary fuel and the secondary fuel, they can react as a whole to form a wide and long flame. Here, the more the injection amount of the primary fuel is larger than the injection amount of the secondary fuel, the more the flame is formed from the discharge head unit 10, and the smaller the injection amount of the primary fuel is, the more the discharge head unit 10 is. Can be formed at short distances from.

In the second flame formation step S4, when the internal temperature T of the heating furnace is equal to or higher than the predetermined automatic ignition temperature T0 according to the result of the temperature comparison step S2, at least one of the primary fuel and the secondary fuel is added to oxygen. Is sprayed. The second flame forming step S4 includes a fuel conditioning step S31-1 and an oxygen regulating step S33-1.

In the fuel adjustment stage S31-1 in the second flame formation stage S4, the primary fuel is injected into the oxygen reaction area R2 through the central nozzle unit 40, and the secondary fuel is injected into the additional reaction area R4. The oxygen control step S33-1 in the second flame formation step S4 injects oxygen into at least one of the oxygen reaction area R2 and the additional reaction area R4 according to the fuel injected in the fuel adjustment step S31-1. To do.

Although not shown, when the oxygen injection nozzle 50 is formed in multiple stages in the third embodiment of the present invention, the oxygen regulation step S33-1 is the same as the first oxygen regulation step as in the second embodiment of the present invention. It can include at least one of the second oxygen regulation steps.

The first oxygen adjustment step is performed on the discharge head unit 10 in a state separated from the central nozzle unit 40 so as to intersect the injection direction of the primary fuel in front of the discharge head unit 10 to form the first oxygen reaction area R21. Oxygen is injected in front of the discharge head unit 10 through the first oxygen nozzle unit 510 provided.

The first oxygen adjustment step is performed on the discharge head unit 10 in a state separated from the central nozzle unit 40 so as to intersect the injection direction of the primary fuel in front of the discharge head unit 10 to form the second oxygen reaction area R22. Oxygen is injected in front of the discharge head unit 10 through the second oxygen nozzle unit 520 provided.

Here, the first oxygen reaction area R21 is formed in front of the discharge head unit 10 and closer to the second oxygen reaction area R22. Further, the second oxygen nozzle unit 520 is formed closer to the central nozzle unit 40 than the first oxygen nozzle unit 510.

By passing through the fuel adjustment stage S31-1 and the oxygen adjustment stage S33-1, the primary fuel and oxygen intersect to form an oxygen reaction region R2 in which the primary fuel and oxygen react, and the secondary fuel and oxygen intersect. It forms an additional reaction zone R4 where the secondary fuel reacts with oxygen.

Therefore, in the second flame formation stage S4, oxygen and fuel collide with each other in at least one of the oxygen reaction area R2 and the additional reaction area R4 to generate a flame, so that an entrease for the inflow of exhaust gas is generated. The injection effect can be maximized, and the recirculation effect of the exhaust gas can be maximized with respect to the exhaust gas flowing into the flame. Further, in the second flame formation step S4, a flameless combustion reaction that is difficult to distinguish with the naked eye is performed.

When oxygen is injected by the oxygen nozzle unit 50 through at least one of the first flame forming step S3 and the second flame forming step S4, between the primary fuel and oxygen, and between the secondary fuel and oxygen. High-temperature exhaust gas generated inside the heating furnace flows into the flame. As a result, the recirculation area R3 is formed at the portion where the exhaust gas flows into the flame. Such a phenomenon represents the effect of recirculating the exhaust gas, and the emission of nitrogen oxides can be sharply reduced. In particular, in the third embodiment of the present invention, it is not necessary to forcibly circulate the exhaust gas generated inside the heating furnace, let the exhaust gas flow into the flame through a separate circulation device, or mix with oxygen. As a structural feature of the oxygen fuel combustor according to the third embodiment of the present invention, the exhaust gas recirculation effect can be exhibited.

In the reaction of oxygen and fuel by at least one of the first flame forming step S3 and the second flame forming step S4, the number and arrangement structure of the oxygen nozzle units 50 are the first embodiment or the second of the present invention. It has the same function and effect as the embodiment.

Further, when fuel and oxygen are injected at at least one of the first flame forming stage S3 and the second flame forming stage S4, the fuel injected in front of the head unit 10 discharged by the central nozzle unit 40. The injection speed of the oxygen nozzle unit 50 can be limited to 50% or less of the injection speed of oxygen injected by the oxygen nozzle unit 50. Such a difference in fuel and oxygen injection rates can maximize the amount of hot exhaust gas flowing into the flame. Further, when fuel and oxygen are injected at at least one of the first flame forming stage S3 and the second flame forming stage S4, the injection speed of oxygen injected by the oxygen nozzle unit 50 is 100 m / s or more. It can be limited to 400 m / s. Such a limitation of the oxygen injection rate can maximize the amount of hot exhaust gas flowing into the flame. For example, when the oxygen injection rate is lower than the limit range, the inflow of high-temperature exhaust gas can be reduced and the amount of nitrogen oxides generated can be increased. Further, when the oxygen injection speed is lower than the limit range, the fuel injection speed is relatively increased, and the flame reaction may not occur. Further, when the oxygen injection speed becomes higher than the limit range, the fuel injection speed is relatively reduced, the inflow of exhaust gas is increased, and the flame reaction may not occur.

According to the oxygen fuel combustor and the oxygen and fuel injection method described above, a wide combustion reaction zone is formed through a unique oxygen injection structure and a unique oxygen injection method, and high-temperature exhaust gas is introduced to reburn. The nitrogen oxides can be significantly reduced through the decrease in the adiabatic flame temperature, and the material inside the heating furnace can be heated substantially uniformly. Further, the size of the heating furnace used in the steelmaking process or the steelmaking process can be minimized, and the size of the oxygen fuel combustor can be reduced. In addition, the collision between fuel and oxygen can be facilitated, the flameless combustion effect caused by the collision flame can be maximized, and the combustion reaction can be stabilized. Further, when the temperature inside the heating furnace becomes equal to or higher than the automatic ignition temperature T0 through the high-speed flow of oxygen and fuel, the collision between the fuel and oxygen can be improved and the flameless combustion reaction can be easily realized.

Further, the coupling of the oxygen nozzle unit 50 is stabilized, and the fuel injected by the central nozzle unit 40 and the oxygen injected by the oxygen nozzle unit 50 can stably collide with each other in front of the discharge head unit 10, and a flame can be generated. Can be stably induced to occur.

Further, since the collision point between oxygen and combustion is separated in front of the discharge head unit 10, the discharge head unit 10, the central nozzle unit 40, and the oxygen nozzle unit 50 are protected from the high temperature flame of oxygen, and have high durability. It is possible to have a high fuel saving effect by using oxygen. Further, the length of the flame can be adjusted while forming a flat flame or forming a general flame through the structure of the central nozzle unit 40 and the number and arrangement structure of the oxygen nozzle units 50. In addition, the amount of high-temperature exhaust gas flowing into the flame can be adjusted by allowing the high-temperature exhaust gas to stably flow into the flame without forcing and without the need for a separate device. .. In addition, multi-stage combustion of oxygen can be induced, ignition and flame retention can be facilitated, and nitrogen oxide emissions can be reduced.

In addition, the entrainment effect for the inflow of high-temperature exhaust gas can be maximized through the correlation between the injection speed of fuel and oxygen, and the recirculation effect of exhaust gas can be maximized in the flame.

As described above, preferred embodiments of the present invention have been described with reference to the drawings, but those skilled in the art will deviate from the ideas and areas of the invention described in the claims. The present invention may be modified or modified in various ways within the scope of the above.

According to the present invention, oxygen can be used to save fuel, and a flame can be formed while forming a flat flame or a general flame capable of uniformly heating materials in an industrial furnace used in an iron making process, a steel making process, or the like. It can be applied to oxygen fuel combustors with adjustable length and features a method of injecting oxygen and fuel.

Claims (10)

A discharge body that is coupled to the heating furnace so that fuel and oxygen are supplied to the heating furnace and is exposed inside the heating furnace so that fuel and oxygen are supplied, and a penetrating body formed in the center of the discharge body. The oxygen penetrating portion formed through the discharge body in a state of being separated from each other along the circumferential direction with respect to the virtual circle centered on the central penetrating portion, and the heating furnace. A discharge head unit including a coupling flange provided on the outer peripheral surface of the discharge body for coupling,
A central supply unit coupled to the central penetration so that at least fuel of fuel and primary oxygen is supplied to the heating furnace.
An oxygen supply unit coupled to the oxygen penetrating portion so that secondary oxygen is supplied to the heating furnace,
At least one of the fuel and the primary oxygen bonded to the central supply unit or the central penetration portion and supplied by the central supply unit is injected so as to be exposed inside the heating furnace at the central penetration portion. Central nozzle unit and
An oxygen nozzle unit that is coupled to the oxygen supply unit or the oxygen penetration portion so as to be exposed to the inside of the heating furnace at the oxygen penetration portion, and ejects secondary oxygen supplied by the oxygen supply unit. Including
The oxygen nozzle unit has a housing cone portion formed by being recessed from the inlet so as to have a smaller diameter.
The injection direction of the injection direction and the secondary oxygen fuel in front of the ejection head unit includes the inclined injection holes that penetrate are formed to be inclined toward the outlet from the housing cone portion so as to intersect, oxygen Fuel combustor. The said oxygen nozzle unit, provided at the outlet, the inclined display unit for indicating the inclination direction of the inclined injection holes is included, the oxygen fuel combustor of claim 1. The spray angle of the oxygen injected by the inclined injection holes is less than 30 degrees 2.5 degrees, oxy-fuel combustor of claim 1. The oxygen penetrating portion is formed from the first oxygen penetrating portion formed through the first virtual circle centered on the central penetrating portion in a state of being separated from each other along the circumferential direction, and the first virtual circle. Including a second oxygen penetrating portion formed through the second virtual circle, which is also large and separated from each other along the circumferential direction.
The oxygen supply unit includes a first oxygen supply unit coupled to the first oxygen penetration portion and a second oxygen supply unit coupled to the second oxygen penetration portion.
The oxygen nozzle unit includes a first oxygen nozzle unit coupled to the first oxygen supply unit or the first oxygen penetration portion so as to be exposed inside the heating furnace at the first oxygen penetration portion, and the first oxygen nozzle unit. and a second oxygen nozzle unit coupled to said second oxygen supply unit or the second oxygen-through portion so as to be exposed to the interior of the heating furnace 2 oxygen penetrating portion, oxy-fuel according to claim 1 Combustor. The amount of exhaust gas flowing into the flame is adjusted by at least one of the secondary oxygen injection interval, the secondary oxygen injection angle, and the collision point between the fuel and the secondary oxygen , claim 1. Oxygen fuel combustor described in. The central supply unit supplies one of the fuel and the primary oxygen to the heating furnace, and the first central supply to which any one of the fuel and the primary oxygen supplied to the heating furnace is transferred. In a state where the first central supply pipe including the pipe and the other one of the fuel and the primary oxygen are supplied to the heating furnace by being coupled to the central penetration portion and the first central supply pipe is inserted. Includes a second central supply unit that includes a second central supply pipe to which the fuel supplied to the heating furnace and the other one of the primary oxygen is transferred.
The central nozzle unit is coupled to the first central supply pipe, and the central nozzle portion through which the first injection port for injecting the fluid transferred by the first central supply pipe is formed and the outer periphery of the central nozzle portion. is projected in terms coupled to said second central feed pipe, the second injection port to the fluid to be transported is injected and a nozzle flange portion which is formed through in the second central feed pipe, according to claim 1 5. The oxygen fuel combustor according to any one of 5. The second injection port is inclined toward the nozzle flange portion so that the injection direction of the fluid transferred by the second central supply pipe intersects the injection direction of the fluid transferred by the first central supply pipe. The oxygen fuel combustor according to claim 6 , which is formed through. The central supply unit is coupled to the central penetration portion with a first central supply unit including a first central supply pipe that supplies primary fuel to the heating furnace and to which the primary fuel supplied to the heating furnace is transferred. A second center including a second central supply pipe to which the secondary fuel is supplied to the heating furnace and the secondary fuel supplied to the heating furnace is transferred in a state where the first central supply pipe is inserted. Including the supply unit
The central nozzle unit has a central nozzle portion that is coupled to the first central supply pipe and is formed through a first injection port through which a primary fuel transferred through the first central supply pipe is injected, and the central nozzle portion. Includes a nozzle flange portion that is projected on the outer peripheral surface of the nozzle, coupled to the second central supply pipe, and through which a second injection port for injecting secondary fuel transferred in the second central supply pipe is formed . The oxygen fuel combustor according to any one of claims 1 to 5. The second injection port is inclined toward the nozzle flange portion so that the injection direction of the secondary fuel transferred by the second central supply pipe intersects the injection direction of oxygen supplied by the oxygen supply unit. The oxygen fuel combustor according to claim 8 , which is formed through. It said oxygen through portion is arranged two-four is separated from each other along the circumferential direction, oxy-fuel combustor as claimed in any one of claims 1 to 5.