KR200236495Y1 - Pollution-reduction burner by cross slewing and diffusion cone - Google Patents

Abstract

The present invention divides the primary vane (1) into the primary vane (9) for turning and the primary vane (10) for turning weakly and crosses the short flame with the turning air and the long flame of the bent shape with the turning air. The secondary separator (5) is extended to the burner parallel part (8), and the diffusion type separator (16) is installed at the end to maintain a uniform temperature distribution in the furnace so that nitrogen oxides are not increased by the dust. Pollution-reduced burner by cross turning and diffused cones that can be reduced.

Description

Pollution-reduction burner by cross slewing and diffusion cone

1 is a cross-sectional view of the burner according to the present invention.

2 is a structural diagram of a swing generator according to the present invention.

3 is a flame structure and furnace temperature distribution diagram according to the present invention.

Figure 4 is a nitrogen oxide and dust emission characteristics for the air ratio change according to the present invention.

5 is nitrogen oxide and dust emission characteristics for load changes according to the present invention.

6 is a cross-sectional view of a conventional burner.

7 is a structural diagram of a swing generator of a conventional burner.

* Explanation of symbols for main parts of the drawings

1: primary bain 2: secondary bain

3: tertiary air throttle 4: burner outer cylinder

5: diffusion secondary separator 6: diffusion diffusion base

7: fuel nozzle 8: burner parallel part

9: Primary vane for steel turning 10: Primary vane for weak turning

11: primary vane drive shaft for steel swing 12: primary vane drive shaft for weak swing

13: tertiary air drive shaft 14: air box

15: burner front plate 16: diffused cone

The present invention relates to an industrial burner using fossil fuels, and more particularly, to have a different turnover rate to reduce nitrogen oxide, a pollutant produced by the combustion of fossil fuels, without increasing dust. By attaching a two-stage swing generator, flame stability is achieved by promoting the mixing of combustion air and fuel in the region of the initial flame, and in the main combustion region by the eccentric mixing of the combustion and alternating combustion air of heavy and weak turns, Diffusion type to prevent the formation of nitrogen oxides, to suppress the formation of nitrogen oxides, and to promote the reduction reaction of nitrogen oxides produced in the excess combustion air to the nitrogen and complete combustion of incomplete combustion materials in the excess combustion air in the downstream combustion zone. Conical barrels can be added to suppress the production of nitrogen oxides without increasing dust. Is about burner.

In the fossil fuel burners currently used for industrial purposes, nitrogen oxides formed and emitted during combustion are the main cause of photochemical smog, and their emissions are strictly regulated day by day. Therefore, in the conversion of fossil energy into thermal energy by combustion, complete combustion is a basic requirement of the burner, and the reduction of nitrogen oxide, which is a pollutant without any increase in dust, is a very important item that determines burner performance. It is recognized.

Nitrogen oxide reduction techniques in industrial burners are conventionally used to reduce excess oxygen in hot combustion zones to reduce the "thermal nitrogen oxides" produced by nitrogen in the combustion air reacting with excess oxygen in a hot combustion atmosphere. In order to maintain the fuel over-air shortage condition, it is mainly used to suppress the reaction of nitrogen and to completely burn the incomplete combustion products caused by the lack of air by injecting sufficient combustion air from the downstream side of the furnace where the temperature in the furnace is relatively low. do.

In other words, the technique currently used as a method for forming a fuel over-air insufficiency in front of the burner is an exhaust gas recirculation method (a method in which a part of the burned exhaust gas is mixed with combustion air and sucked into the burner to burn). Nitrogen oxide reduction techniques by adding equipment, such as two-stage combustion (sending a portion of the combustion air directly to a hole installed on the burner to completely burn incompletely burned combustion gases in the burner area), and mixing combustion air and fuel in the burner By controlling the properties it can be classified as a "low nitrogen oxide burner" which reduces the production of nitrogen oxides.

The former has a high effect of reducing nitrogen oxides, but it is required to install additional equipment for reducing nitrogen oxides in the existing facilities, and economic burden and continuous maintenance and maintenance are required. The latter tends to increase in preference because nitrogen oxides can be reduced without additional equipment by changing the structure of the burner to nitrogen reduction type.

The purpose of the present invention was devised to meet the needs of the nitrogen-reduced burner as described above, the object of the present invention is to supply the steel and weakly turned air alternately by using different turning degrees for the combustion of steel turning The air stabilizes flames by turning the steel and forms a short flame of excessive fuel, thereby mitigating the maximum temperature range of the flame, thereby suppressing the production of nitrogen oxides. Prevents excessive increase and prevents the increase of dust by the complete combustion of unburned gas produced in the main combustion zone by the concentrated supply of combustion air to the downstream combustion zone by the diffusion cone and by reducing nitrogen oxide to nitrogen It is to provide a burner capable of reducing nitrogen oxides without any special increase in dust.

The present invention changes the setting method of the turning vane to have different turning degrees in one turning machine, and attaches the diffusion cone to the end of the diffusion secondary separation cylinder to achieve the initial purpose. Stabilization, alternating supply of weak and heavy swing air creates an excess fuel (excess air ratio <1) state in the main combustion zone, reducing the formation of nitrogen oxides by reducing the high temperature zone due to fuel excess and cooling the hot flame surface. In addition, the axial velocity component of the weakly turning air is enhanced to facilitate the downstream movement of the fuel and to be located at a low temperature flame zone, thereby promoting the gasification of nitrogen components in the fuel to generate partial 'fuel NOx'. Was suppressed.

In addition, the flame length of the combustion wire is short and the diameter is large, thereby preventing the increase in flame length, which is the biggest disadvantage of the nitrogen oxide-reduced burner. The incomplete combustion material produced by the fuel surplus is completely burned by intensively meeting the swirling air and weakly turning air and the downstream combustion area concentrated by the diffusion cone to the outside of the flame. In this state, the reduction reaction of nitrogen oxide to nitrogen was promoted to reduce the nitrogen oxide while discharging dust in the same manner as the general burner without excessively increasing the flame length due to the reduction of the nitrogen oxide.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the present invention has a secondary vane (2), a tertiary air control plate (3), a burner outer cylinder (4), a diffuse secondary separator (5), a diffuse flame sprayer (6), and a fuel nozzle ( 7), burner parallel part 8, steel vane primary vane 9, steel vane primary vane 10, steel vane primary vane drive shaft 11, primary pivot vane drive shaft 12, tertiary air drive shaft 13 , Air box 14, burner face plate 15, and diffuser cone 16.

More specifically, the burners according to the present invention are connected to each other over the air box 14 and the first equal radius circumference in the air box 14 as shown in FIGS. 6 to 7. A primary vane 1, secondary vanes 2 connected to each other over a circumference of a second equal radius in the air box 14, and a burner outer cylinder 4 forming an inner circumferential wall of the air box 14; And a diffusion type secondary separator (5) narrowing from the secondary vanes (2) toward the furnace, a burner parallel part (8) connected in contact with the air box (14), and an inner circumference of the air box (14). In the conventional burner which consists of the fuel nozzle 7 located in the burner center in a wall, and the diffuse type | mold flame sprayer 6 provided in the one end part of the said fuel nozzle 7, in FIGS. As shown in the drawing, the primary vane 1 is applied to the first It is divided into two groups of steel vane primary vanes 9 connected to each other over a circumference of a radius to form a semicircle and weak primary vanes 10 to form a remaining semicircle, and the above is maintained to maintain a uniform temperature distribution in the furnace. The diffusion secondary barrel 5 is extended to the burner parallel part 8, and the diffusion cone cylinder 16 is installed in the end part.

The burner according to the present invention having the above structure reduces the nitrogen oxides is as follows. First, as shown in FIG. 1, fuel is symmetrically sprayed at the center of the furnace through the fuel nozzle 7 installed at the center of the burner. Combustion air is uniformly distributed along the first and second equal radii in the air box 14 and passes through the primary and secondary pivot vanes 9 and 10, respectively. It is separated and flows into the furnace past the diffusion secondary separator (5) and past the burner parallel (8). In addition, about 30% of the combustion air turning through the primary turning vane (9) and the primary turning vane (10) is separated by the diffusion secondary separator (5) and re-elected through the secondary vanes (2). Used as combustion air for ignition, it contributes in part to flame stabilization and prevents destabilization of the intersection of the main combustion zone and the initial combustion zone.

Combustion air, which is strongly turned while passing through the turning primary vanes 9, is compressed by the diffusion cone cylinder 16 and is injected like a nozzle, so that it is concentrated outside the hearth rather than the hearth of the hearth. Flame stabilization is achieved, and the flame shape is pulled to the burner side to reduce the flame length and promote the cooling of the flame to reduce the combustion zone of high temperature to suppress the production of nitrogen oxides. The formation of secondary nitrogen oxides is suppressed, and the low temperature of the axial flow component is strengthened while passing through the weak turning primary vanes (10), and the weakly turning air that is supplied crosswise with the strong turning air evaporates the fuel droplets to the downstream side. By placing the fuel droplets in the flame zone of the gas, the nitrogen component in the unburned fuel is gasified. Due to this, it is possible to suppress fuel nitrogen oxides, which is particularly effective for the combustion of fuels containing a large amount of nitrogen. In addition, short flame flames of the main combustion zone result in a relatively long residence time of the combustion gases, creating sufficient time to achieve complete combustion in the downstream, and the intermediate products and nitrogen oxides produced by the excess of fuel. The reduction reaction region with nitrogen also increases, maximizing the effect of reducing nitrogen oxides.

The primary air for combustion, which is weakly turned while passing through the weakly turning primary vane 10, has a relatively low mixing degree with the fuel, and moves the wake side flame back to the burner side as shown in FIG. To equalize the entire temperature distribution in the furnace. In addition, the concentration of combustion air on the downstream side of the flame promotes complete combustion of the incomplete combustion gas to prevent the increase of dust.

As described above, in order to apply the present invention, which alternately generates steel turns and weak acid ashes, to reduce nitrogen oxides to various furnace shapes, the steel vane primary vanes 9 of one of the steel vane primary vanes 9 are applied. ) And each of the primary swing vane driving shafts 12 installed in the weak primary swing vane 10 of the group of the primary swing vane 10 and the primary swing vane 10 connected to each other in a lateral direction. By extending and installing the burner face plate 15, the turning adjustment handle (not shown) installed at the end thereof can adjust each suitable turning and weak turning degree to improve combustion reliability.

The diffusion flame base 6 was installed for the primary flame stabilization, and the tertiary air passing through the expansion flame base was properly controlled by the tertiary air control plate 3 connected to one end of the tertiary air drive shaft 13. Passing the burner outer cylinder 4 into the diffusion type flame sprayer 6, the primary flame stability by the tertiary air passing through the diffusion type flame spraying is to destabilize the flame due to the formation of an excess fuel region according to nitrogen oxide reduction As it tends, its reinforcement is reinforced by the secondary air passing through the secondary vanes (2). In addition, the secondary air to prevent the increase of nitrogen oxides due to too low air condition (excess air ratio <0.3) of the main combustion region by the wake concentration of the weak primary air is formed while passing through the weak primary primary vane (10) To the main combustion zone.

As shown in FIGS. 4 to 5, the effect of the present invention can reduce the nitrogen oxides produced by 30% or more without a special increase in dust as compared to the conventional burners. By turning the combustion vane by the primary vane into two stages and controlling the flame length and combustion state with the diffusion cone cylinder 16, the overall temperature distribution in the furnace can be maintained uniformly, preventing local overheating of the furnace pipe. . In addition, since the appropriate turning degree according to the shape of the furnace can be adjusted by the steel vane primary vane drive shaft 11 and the weak pivot primary vane drive shaft 12, it is possible to improve and apply combustion reliability to various furnace shapes.

The present invention provides a case where a large amount of nitrogen is contained in the fuel by gasifying nitrogen contained in the fuel in the flame by the two-stage swing and maintaining a uniform temperature distribution in the furnace by the diffusion cone. Very effective in reducing nitrogen oxides.

Claims (1)

An air box 14, primary vanes 1 connected to each other over a first equal radius of circumference in the air box 14, and a second vane 1 connected to each other over a circumference of a second equal radius in the air box 14. A secondary vane 2, a burner outer cylinder 4 forming an inner circumferential wall of the air box 14, a diffusion secondary separator 5 narrowed toward the furnace from the secondary vane 2 and extending in parallel; A burner parallel part 8 connected to the air box 14, a fuel nozzle 7 positioned in the inner circumferential wall of the air box 14, and one end of the fuel nozzle 7. In the burner composed of the diffuse type injector (6), the primary vanes (1) are connected to each other over the circumference of the first equal radius to form the primary vanes (9) for turning and the other semicircles to form semicircles. It is divided into two groups of primary vanes 10 for weak turning, the primary for turning It is installed on the primary vane driving shaft 11 for steel turning and the primary vane 10 for weak turning primary vane 10 connected to the primary vane 9 for steel turning among the groups of vanes 9. Each of the primary vane driving shafts 12 for pivoting is extended and installed side by side in the transverse direction to the burner front plate 15 and the pivoting degree is adjusted by a pivot adjusting handle installed at an end thereof, and the diffusion type secondary separator ( 5) is a pollution-type burner of the cross-slewing and diffused conical cylinders, characterized in that the spreading conical cylinder (16) is installed at the end of the parallel to the burner parallel (8).