KR101579593B1

KR101579593B1 - Oil burner head for Low nitrogen oxide and burner using the same

Info

Publication number: KR101579593B1
Application number: KR1020150055697A
Authority: KR
Inventors: 이종태; 박재언
Original assignee: 주식회사 수국
Priority date: 2015-04-21
Filing date: 2015-04-21
Publication date: 2015-12-23

Abstract

The present invention is characterized in that the low-knock oil-burning head discharges fuel in an excess fuel state, and the exhaust gas is self-recirculated in the combustion chamber using the discharge speed of air discharged from the low-knock oil- Knock type oil combustion head that suppresses the occurrence of knocks and prompt knocks. To this end, the present invention provides an inflow head having a slot shape inserted into a blast tube and corresponding to one side of the slot shape, having a smaller diameter toward the center portion, and a fuel injection pipe inserted in the blast tube insertion direction, And the inclined surface may include a burst head in which an elongated hole for introducing air into the inner circumferential surface is perforated.

Description

TECHNICAL FIELD The present invention relates to an oil burner head and an oil burner head using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a low-kox oil-burning head and a low-kox oil-burner using the same. More particularly, the present invention relates to an oil- The present invention relates to an oil burner for reducing the temperature of a flame and a thermal knock-type oil burner for reducing the temperature of the flame by regenerating a low-temperature combustion gas at a peripheral portion of the flame generating region.

Gas burners that burn gas in the combustion chamber cause thermal NOx and Prompt NOx while oil burners that burn oil in the combustion chamber are included in the fuel. The nitrogen component causes the fuel nox in the combustion process. The fuel rust is generated by the reaction of nitrogen (Nitrogen) contained in the fuel with oxygen in the air, and is generated unless the nitrogen component contained in the fuel is completely removed. Thus, the fuel rust is almost impossible to remove by complete combustion.

Because of the technical difficulties of reducing the amount of fuel rust generated by the combustion technique of fuel rust, efforts to reduce the amount of fuel rust have not achieved much improvement compared to the technology of reducing thermal NOx and Prompt NOx have.

The higher the nitrogen content of the fuel is, the lower the conversion rate to convert to NOx and the lower the content of nitrogen in the fuel, the higher the conversion rate to NOx. This will be described with reference to FIG. 1 and FIG.

FIG. 1 shows a graph of the relationship between the oxygen concentration and the conversion rate, and FIG. 2 shows a graph of the relationship between the amount of nitrogen contained in the fuel and the conversion rate.

Referring to the figure, the knox conversion rate tends to be proportional to the oxygen concentration in the combustion chamber, and the conversion rate tends to increase as the air ratio increases. It is also seen that the conversion rate increases as the amount of nitrogen (N) contained in the fuel becomes smaller, and conversely, as the amount of nitrogen (N) contained in the fuel increases, the conversion rate decreases.

Accordingly, when the light oil having a low nitrogen (N) content is burned, the conversion rate from the combustion chamber to the NOx is high. Therefore, when light oil is used as the fuel, it is necessary to control the conversion rate by the combustion technique because the knox conversion rate is high. As such a combustion technique, there has been proposed a fuel rich combustion method of supplying an insufficient amount of air to the sprayed oil particles.

The oxidation reaction of the oil particles can not be vigorously caused in an environment where the air supplied to the oil particles is insufficient and the conversion rate by which the nitrogen contained in the oil is converted into the knock is lowered by such a combustion technique. However, there is a possibility that incomplete combustion may occur due to a shortage of air supplied for combustion of oil particles, and further combustion control is required to prevent incomplete combustion.

From this viewpoint, the applicant of the present invention has proposed a low-knock type oil burner that reduces the temperature of the flame by reducing the fuel discharged from the diffuser of the oil burner through the KR 10-2012-0080041, thereby reducing the occurrence of the thermal knock . KR 10-2012-0080041 focuses on reducing the generation of thermal knocks by starting combustion in an excess fuel state and allowing the burned combustion gas to return to the flame under combustion. However, in the case of making a fuel-rich state to reduce the conversion of nitrogen to the rust, the occurrence of prompt knocks may increase, and the possibility of incomplete combustion may increase and the amount of generated carbon monoxide (CO) may increase .

An object of the present invention is to provide a low-knock type oil burning head which minimizes generation of thermal knots, fuel knocks and carbon monoxide, and an oil knock type oil burner using the same.

According to the present invention, the above-mentioned object is achieved according to the present invention by providing an inflow pipe in which a fuel injection pipe is inserted in a blast tube insertion direction, And an inclined surface corresponding to the other side of the shape of the head and the elongated shape and increasing the diameter of the tube toward the blast tube from the central portion and an oblong hole for introducing air into the inner circumferential surface is perforated.

According to the present invention, the low-knock oil-burning head discharges fuel in an excess fuel state, and uses the discharge speed of air discharged from the low-knock oil-burning head to recirculate the exhaust gas in the combustion chamber as much as possible The generation of the thermal knock in the combustion chamber and the generation of carbon monoxide (CO), which is an incomplete combustion product, can be suppressed.

Figure 1 shows a graph of the relationship between oxygen concentration and conversion rate.
2 shows a graph of the relationship between the amount of nitrogen contained in the fuel and the conversion rate.
3 is a cross-sectional view of an oil mist combustion head according to an embodiment of the present invention.
Fig. 4 shows a structural view in the direction D1 of the low-nox-type oil-burning head shown in Fig.
Fig. 5 shows a side view of the low knock type oil burning head shown in Fig.
Fig. 6 shows a side sectional view of the low-knock type combustion head shown in Fig. 3;
FIG. 7 shows a cross-sectional view of the burst head of FIG. 3 taken in the direction D2.
FIG. 8 shows a reference drawing for a method of implementing magnetic recirculation combustion in a combustion furnace, and a low-knock oil-burning head employing the low-knock type oil-burning head according to the embodiment.
Fig. 9 shows a conceptual diagram of a method for suppressing the thermal knock by magnetic recirculation combustion.
10 shows a test report of an oil burner of low knock type having the low knock oil burn head according to the embodiment.

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

FIG. 3 is a cross-sectional view of the low-nox-type oil-burning head according to the embodiment of the present invention, FIG. 4 is a view showing the structure of the low- 3 shows a side sectional view of the low knock type oil burning head shown in Fig. 3, and Fig. 6 shows a side sectional view of the low knock type combustion head shown in Fig.

3 to 6, the low-knock type oil burning head 100 according to the embodiment is inserted into the blast tube 200, and the shape of the side surface is the same as that of the inflow head 110 and a burst head 120. The burst head 120 shown in FIG. The inflow head 110 and the burst head 120 may have a shape symmetrical to each other with respect to the central portion P1, and the individual components may be welded or integrally formed.

The inflow head 110 may have a circular tube structure in which the diameter increases from the central portion P1 toward the D3 direction and the diameter decreases toward the central portion P1. Accordingly, as shown in FIG. 1, the cross section of the inflow head 110 increases in cross section in the direction D3, forming the back side S1, and the cross section decreases in the direction of the central portion P1.

A plurality of air inlet ports 111 are formed in the rear surface S1 so that air can be guided to the peripheral edge of the inlet head 110. [ The volume of the air passage A1 whose volume is determined according to the distance d0 between the blast tube 200 and the inflow head 110 with respect to the volume of the air intake port 111 formed on the rear surface S1 . The air discharged through the blast tube 200 has a larger amount of air passing through the air passage A1 than the air passage A2 passing through the air inlet 111 and has a higher discharge pressure.

The end of the blast tube 200 may be formed with a side portion 201 bent inward so that the diameter of the end portion is narrowed. The side portion 201 can cause the air traveling straight to the combustion chamber F along the air flow path A1 to bend toward the center line RS. The air progression characteristic is such that the shape of the flame discharged from the low-knock type oil burning head 100 according to the embodiment has a long shape and the pressure of the center region of the long shape is made low so that the self- (Self circulation) can be actively induced. This will be described in detail later.

The fuel injection pipe insertion port 112 is formed in the back surface S1 of the inflow head 110 and the fuel injection pipe 50 for injecting oil can be inserted into the fuel injection pipe insertion port 112. [ A sufficient amount of air is not introduced into the air inlet 111 formed in the back surface S1 when the oil is sprayed from the fuel injection tube 50. Therefore, the amount of air in the peripheral edge of the inlet head 110 is insufficient, The amount of fuel becomes excessive, that is, the fuel is in an excess state.

At this time, the air ratio (lambda), which is the ratio between the fuel amount and the air amount, can be in the range of 0.5 to 0.7. When the air ratio lambda is ignited and burned in an excess fuel state, The oxidation reaction does not occur rapidly, and the rapid oxidation reaction is suppressed, so that the generation of fuel NOx is reduced.

When the air reaches the burst head 120 through the central portion P1 of the inflow head 110, the discharge pressure of the air is lowered by the Bernoulli effect, and the speed of the air is increased. The air inlet 121 and the elongate hole 122 are formed along the inclined plane S31 and the inclined plane S32 of the burst head 120. The air inlet 121 is a plurality of perforations formed in the region S31 So that the air flowing through the blast tube 200 is guided to the burst head 120 to be burnt with the fuel at the burst head 120.

The long hole 122 is formed in the inclined plane S32 and a part of the air directed toward the combustion chamber F along the air flow path A1 can be guided into the burst head 120. [ As shown in FIG. 6, the long hole 122 is formed in a hatched shape at the outer periphery of the burst head 120, and penetrates into the inner periphery of the burst head 120, A portion of the air can be introduced into the inner periphery of the burst head 120. This will be described with reference to FIG.

FIG. 7 shows a cross-sectional view of the burst head 120 of FIG. 1 as viewed in the direction D2.

7, the elongated hole 122 formed in the burst head 120 is formed by perforating the outer periphery of the burst head 120 in the inner circumferential direction, and does not face the center of the section P2 but forms a vortex Lt; / RTI >

In Fig. 7, the long hole C1 is obliquely perforated while maintaining an angle with the center P2 of the section. The air flowing along the long hole C1 has a directional characteristic at the inflow angle? At the periphery of the burst head 120 in accordance with the inflow angle? Formed by the long holes C1. In the case of the long hole C1, the other elongated holes C2 to C10 formed in the blast tube 120 may be formed at the same inflow angle [theta] in the burst head 120, . 6, the air flowing into the inner circumferential edge of the burst head 120 through the long hole C1 may have a clockwise or counterclockwise rotational direction with reference to FIG. 6. At this time, Flowing oil and air can be mixed rapidly. In Fig. 7, the area S5 between the burst head 120 and the blast tube 200 may correspond to the air discharge area of the air flowing in the air route A1 of Fig.

FIG. 8 shows a reference diagram of a method for implementing the magnetic recirculation combustion in the combustion furnace F of the low-knock type oil burning head 100 and the low-knock type oil burner employing it according to the embodiment. 8 will be described with reference to FIGS. 3 to 7. FIG.

8, the fuel injected toward the combustion chamber F through the fuel injection pipe 50 passes through the air intake port 111 provided in the inlet head 110 of the long shape, Thereby combusting the fuel. When the fuel is in excess of the fuel in excess of the air, the fuel does not cause a rapid oxidation reaction due to the lack of air. As rapid oxidation reaction is suppressed, fuel and air (λ = 0.5 to 0.7 Is led to the burst head 120. [

The burst head 120 further supplies air required for combustion through the air inlet 121 formed in the inclined plane S31. At this time, by using the elongated hole 122 formed in the inclined plane S32, the burst head 120 The fuel and air flowing through the burst head 120 can be rapidly mixed with each other.

The air discharge area S5 where the end of the burst head 120 is adjacent to the side wall portion 201 of the blast tube 200 discharges most of the air supplied from the blast tube 200. [ The air discharge area S5 is formed so that air is bent toward the center line RS instead of advancing in the D0 direction by the side wall portion 201. [

The air discharged from the air discharge area S5 does not advance straight in the direction D0 but concentrates in the direction of the center line RS so that the flame discharged from the burst head 120 is bent toward the reference line RS and then spread again, Of the flame. This will be described with reference to FIG.

9, the flame discharged from the burst head 120 by the air A11 discharged in the air discharge area S5 travels in the B1 direction and is turned in the direction of the reference line RS, B2 direction. Thereafter, as the width of the flame increases again at the point P4, it is possible to form a flame in the shape of a long bead at the point P3. The air A11 discharged in the air discharge area S5 corresponds to most of the amount of air flowing through the blast tube 200 and flows into the back surface S1 of the inflow head 110 through the air intake port 111 The amount of air occupies a larger amount of air than the amount of air flowing into the burst head 120 through the air inlet 121 or the long hole 122 formed in the burst head 120. [

Accordingly, the amount of air flowing along the blast tube 200 and the air pressure are larger than the amount and pressure of the air discharged from the burst head 120. In addition, since the diameter of the center portion P1 of the long head shape is small while the diameter of the burst head 120 is extended toward the side portion 201, the pressure at the P3 point is lowered according to the Bernoulli effect.

Therefore, the air in the air discharge area S5 having a large pressure is switched in the B1 direction to the B2 direction, and the direction of the air discharged from the burst head 120 is switched to the direction B1 to increase the peripheral pressure at the point P3 by the strong discharge pressure and pressure Can be lowered.

Accordingly, the combustion gas whose temperature is lowered after combustion is led to the point P3 where the ambient pressure is lowered, and the flame at the point P3 is lowered in temperature by the combustion gas due to the combustion gas of lower temperature. As a result, the temperature of the flame discharged from the low-knock oil burner is lowered to 1000 ° C or lower, so that the thermal knock occurring at a temperature of 1000 ° C or higher can be suppressed.

The combustion gas has a state in which its temperature is relatively lower than the flame temperature due to heat loss due to radiant heat transfer with the combustion chamber (F). At the point P3 where the flame discharged from the low-knock type oil combustion head forms the long bead, the peripheral pressure is lowered due to the strong pressure and the amount of air formed by the air discharge area S5. Can be strongly induced.

That is, the low-knock type oil burner according to the embodiment has a structure in which the oil burning head 100 inserted into the combustion chamber F in the main body 300 for supplying oil and air supplies fuel knocks And then the temperature of the flame is lowered by self recirculation, the occurrence of the thermal knock can be suppressed.

10 shows test results of the low-knock type oil burner to which the low-knock type oil burning head 100 according to the embodiment is applied.

Referring to FIG. 10, the low-knock type oil burner to which the oil burning head 100 according to the embodiment is applied was tested for the second time,

(O2) concentration in the exhaust gas is 3.7%, carbon monoxide (CO) is 4 ppm and nitrogen oxide (NOx) is 36 ppm in the low combustion (primary combustion) ) Concentration of 4.2%, carbon monoxide (CO) of 10 ppm, and nitrogen oxide (NOx) of 38 ppm. Although not shown in this test report, the present applicant has found that the "Bacharach smoke scale" in which the low-rust type oil burner equipped with the low-knock type oil burning head according to the embodiment has the soot generating concentration at both low combustion and high combustion is "NO. 1 "or less, and it is confirmed that low NOx performance is exhibited with almost no incomplete combustion.

It is required that the NOx value of the combustion gas be 70 ppm or less in order to be recognized as an eco-friendly low-knock burner in the Republic of Korea in the present. As shown in this test report, the low knock type oil burning head 100 according to the embodiment and the low knock type oil burner 300 employing this embodiment have a NOx emission amount of 36 ppm at the time of low combustion, (EN267, Class 3) of less than 60ppm, which is the highest requirement for the highest environmental conditions in Europe.

100: low knock type oil combustion head 110: inflow head
111: air inlet 120: burst head
121: air inlet 122: long hole
200: blast tube 201: side portion
A1, A2: Air flow path P1: Center
RS: Center line S1: Rear
S31, S32:

Claims

And has a slot shape inserted into the blast tube,
An inflow head corresponding to one side of the long shape, having a smaller diameter toward a center portion, and a fuel spouting tube inserted in the blast tube insertion direction; And
And a sloped surface corresponding to the other side of the elongated shape and having a diameter increasing from the central portion toward the blast tube, wherein the sloped surface has a long hole for piercing the air into the inner circumferential surface,
The inclined surface
A first inclined surface adjacent to the central portion and a second inclined surface adjacent to the blast tube,
An air inlet for introducing the air is formed in the first inclined surface, the elongated hole is formed in the second inclined surface,
Wherein the inflow head comprises:
And an air intake port is provided on an insertion surface of the fuel injection pipe, and the air intake port is disposed adjacent to the fuel injection pipe.

delete

The method according to claim 1,
Wherein the first inclined surface and the second inclined surface are inclined,
Wherein the bent portion has a bending angle different from each other with respect to the center portion.

delete

The method according to claim 1,
The above-
Wherein an inner circumferential edge is perforated at an outer circumference of the burst head and a plurality of oblique lines are arranged in a direction of a discharge direction of a flame discharged from the inside of the burst head.

6. The method of claim 5,
The above-
Wherein the air is directed toward the inner periphery at the outer periphery of the burst head by the elongated hole having the slanting structure to rotate the air discharged from the inner periphery of the burst head toward the combustion chamber Oil burning head.

The method according to claim 1,
Wherein the blast tube comprises:
And a side portion that is bent to narrow the end portion inserted into the combustion chamber is formed.

The method according to claim 1,
The above-
And the width of the hole is 0.5 mm to 5 mm.

9. An oil burner of low knock type comprising the low knock type oil burning head according to any one of claims 1, 3 and 5 to 8.