KR20160141616A

KR20160141616A - A fuel supply nozzle for the solid fuel burner

Info

Publication number: KR20160141616A
Application number: KR1020150077570A
Authority: KR
Inventors: 채태영; 양원; 이재욱
Original assignee: 한국생산기술연구원
Priority date: 2015-06-01
Filing date: 2015-06-01
Publication date: 2016-12-09

Abstract

The solid fuel is prevented from being stuck or collided in the process of supplying the solid fuel through the fuel supply nozzle and the swirling flow is smoothly formed to accelerate the mixing with the oxidizing agent so that the stable combustion and the combustion of the nitrogen compound _The fuel supply nozzle for a solid fuel burner is provided with a spiral swirling flow guide groove for forming a swirling flow by the supply pressure of the solid fuel supplied without vanes to the inner surface of the fuel supply nozzle so as to minimize the amount of the swirling flow.
Accordingly, the solid fuel supply can be stably performed, thereby achieving high combustion efficiency, minimizing the emission of harmful substances, and securing a long service life.

Description

Technical Field [0001] The present invention relates to a fuel supply nozzle for a solid fuel burner,

The present invention relates to a fuel supply nozzle applied to a solid fuel burner, and more particularly, to a fuel supply nozzle which smoothly forms a swirling flow without a solid fuel being stuck or collided in a process of supplying solid fuel through a fuel supply nozzle, To a fuel supply nozzle for a solid fuel burner capable of minimizing stable combustion and nitrogen compounds (NO _x ) in a combustion gas.

Pulverized coal is a common fuel used in furnaces or steam generating boilers. It is desirable to replace or supplement the pulverized coal with a substitute fuel depending on the use environment. The pulverized coal typically has a mass average particle size on the order of 30 to 40 microns, which allows it to float to a substantially complete burnout, with a residence time of 1 to 2 seconds in the combustion zone. However, many alternative fuels, such as the various biomass fuels, can not be finely ground like coal, resulting in average particle size of 1 mm (1000 microns) and many particles as large as a few mm. The combustion of these large alternative fuels is typically unstable and incomplete. Moreover, most of these fuels have a higher water content and lower specific energy content than coal and therefore can not generate a flame temperature high enough to maintain the design heat transfer of the boiler system. Thus, a costly de-rate is caused in the boiler steam output.

Further, the solid fuel is combusted while being mixed with the oxidizer, and the higher the mixing ratio with the oxidizer, the higher the combustion efficiency.

In order to increase the mixing ratio of the solid fuel and the oxidizer in order to increase the combustion efficiency as described above, a conventional burner using the solid fuel has an oxidant supply pipe for supplying the oxidant in the form of a double tube to the outside of the fuel supply nozzle supplied with the solid fuel At this time, a vane for generating a swirl is provided between the fuel supply nozzle and the oxidant supply pipe.

However, the solid fuel has a disadvantage that it does not have a high mixing efficiency in the process of mixing with the oxidant supplied in a vortex form.

Conventional prior arts for supplying an oxidant in the form of a vortex as described above include Korean Registered Utility Model No. 20-0342827 (hereinafter referred to as Patent Document 1) and Korean Patent Registration No. 10-0380747 (hereinafter referred to as Patent Document 2 Quot;) and U.S. Published Patent Application No. US 2011/0076630 (hereinafter referred to as "Patent Document 3").

Also, a technique formed in the form of multiple tubes as disclosed in Korean Patent No. 10-0837713 (hereinafter referred to as Patent Document 4) has been proposed.

Korean Registered Utility Model No. 20-0342827 Korean Patent No. 10-0380747 U.S. Published Patent Application No. US 2011/0076630 Korean Patent No. 10-0837713

However, in the case of Patent Documents 1 to 4, the mixing of the solid fuel in the portion in contact with the oxidant supplied in a vortex shape can be smoothly performed, but the solid fuel itself has a disadvantage that it can not be mixed efficiently due to the linearity due to the injection pressure .

In order to solve the above problems, there has been a case where a vane is directly mounted inside a fuel supply nozzle of a burner using a solid fuel. However, since the vane is mounted inside the fuel supply nozzle, The vane is deformed or damaged, and the problem of solid fuel adhered to the vane causes a problem that the introduction of the solid fuel becomes unstable, which causes the combustion efficiency to be lowered rather.

SUMMARY OF THE INVENTION It is a primary object of the present invention to solve the above-mentioned problems of the prior art, and it is a main object of the present invention to provide a fuel supply apparatus and a fuel supply apparatus, in which solid fuel is supplied through a fuel supply nozzle, (加速化) one to minimize the nitrogen compounds (NO _X) in the stable combustion and the combustion gas according to Sikkim to provide a solid fuel burner in the fuel supply nozzle.

Another object of the present invention is to make it possible to have a proper swirl flow strength according to the application to be used.

Another object of the present invention is to enable selective use according to the strength of the swirling flow.

According to an aspect of the present invention, there is provided a fuel supply nozzle provided in a burner for supplying a solid fuel to be mixed with an oxidizer, the fuel supply nozzle comprising: A spiral swirling flow guide groove for forming a swirling flow is provided.

At least one or more swirl flow guide grooves are formed.

The helical angle of the swirling flow guiding groove is formed within an acute angle range with the horizontal line of the center of the fuel supply nozzle.

The fuel supply nozzle is detachably provided to the fuel supply pipe.

The present invention is directed to a method of minimizing nitrogen oxides in a combustion gas and stabilizing combustion by accelerating mixing with an oxidizing agent by smoothly forming a swirling flow without solid fuel sticking or collision in the process of supplying solid fuel through a fuel supply nozzle Thus, the solid fuel supply can be stably performed, thereby achieving high combustion efficiency, minimizing the emission of harmful substances, and securing a long service life.

In addition, it is possible to optimize the mixing ratio with the oxidizing agent by making it possible to have an appropriate swirl flow strength depending on the application to be used.

In addition, by selectively using the burner according to the intensity of the swirling flow, the mixing ratio of the oxidizer can be maximized depending on the capacity of the burner and the intended use.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a state in which a burner is installed to explain the present invention;
2 is a partially cutaway perspective view for explaining a fuel supply nozzle of the present invention,
Figure 3 is a cross-sectional view according to Figure 2,
4 is a simulation for explaining the swirling flow strength of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The present invention is not limited to the embodiments.

2 is a partially cutaway perspective view for explaining a fuel supply nozzle of the present invention, and Fig. 3 is a cross-sectional view according to Fig. 2. Fig.

Discloses a fuel supply nozzle 110 provided in a known burner 100 that supplies solid fuel to be mixed with an oxidant as shown and burned.

The fuel supply nozzle 110 of the burner 100 includes at least one oxidant supply pipe 120 for mixing with the solid fuel and supplying an oxidant required for combustion. At this time, it is preferable that the oxidant supply pipe is provided with a helical vane so as to form a swirl flow. Further, the oxidant supply pipe may be formed in the form of a double or multi-tube.

The present invention relates to a method and apparatus for supplying a solid fuel through a fuel supply nozzle, and a solid fuel is smoothly formed without colliding with or colliding with a solid fuel, thereby accelerating (mixing) NO _x ) can be minimized.

There is provided a spiral swirling flow guide groove 10 for forming a swirling flow by the supply pressure of the solid fuel supplied without the vanes forming the ordinary swirling flow on the inner surface of the fuel supply nozzle 110 according to the present invention . At this time, the swirling flow guide groove is formed continuously along the inner surface of the fuel supply nozzle from one end to the other end of the fuel supply nozzle.

In other words, in order to increase the mixing ratio with the oxidizing agent in the process of supplying the solid fuel through the fuel supply nozzle, fuel supply smoothly occurs due to damage or sticking when the vane is directly installed inside the fuel supply nozzle Can be solved.

That is, the swirling flow guiding groove 10 formed in the fuel supply nozzle 110 of the present invention is not protruded or mounted in the form of a vane on the inner surface of the fuel supply nozzle, , The swirling flow naturally forms along the swirling flow guide groove in the process of supplying the solid fuel. Particularly, the swirling flow guide groove of the present invention does not cause the solid fuel to collide with or adhere to the conventional vane, and only forms a swirling flow smoothly.

The solid fuel is supplied to the other end of the swirling flow induction groove while generating a swirling flow from one end of the inner side of the fuel supply nozzle so that the solid fuel turns from the outer side to the inner center while being pivoted from the outside, At the point of time, the entire solid fuel is supplied in a swirling manner.

Thus, the solid fuel supplied while rotating from the fuel supply nozzle is smoothly mixed with the oxidant supplied from the oxidant supply pipe provided outside the fuel supply nozzle. At this time, when the oxidizing agent is also supplied in a vortexing manner by a known method, the mixing ratio is further increased.

Therefore, the combustion can be performed stably and efficiently by a high mixing ratio of the solid fuel and the oxidizer. In addition, because of high combustion efficiency, it is also possible to minimize the generation of nitrogen compounds generated during combustion.

Accordingly, the mixing ratio of the solid fuel and the oxidizing agent is maximized by the spiral-shaped swirling flow guide groove, which is a simple structure on the inner surface of the fuel supply nozzle, rather than having a complicated structure or separately installing the mixture of the solid fuel and the oxidizing agent Have the conditions to be able to do.

Accordingly, there is an advantage that stable combustion can be performed, and the generation of nitrogen compounds generated in the combustion process due to high combustion efficiency can be minimized.

Meanwhile, at least one or more swirl flow guide grooves 10 formed on the inner surface of the fuel supply nozzle 110 may be formed to provide a more smooth swirling action. That is, when at least two or more swirl flow guide grooves are formed rather than one swirl flow guide groove, it is preferable to form a plurality of swirl flow guide grooves so as to have a higher swirl action.

In addition, the helical angle of the swirling flow guide groove 10 formed in a spiral shape is formed within an acute angle with the horizontal line of the center of the fuel supply nozzle 110. And preferably 45 to 60 degrees.

That is, FIG. 4 is a simulation experiment of the strength of the swirling flow, which is a test of the tangential velocity when the swirling angle of the swirling flow guide groove is 45 ° and 60 °. At this time, the experimental conditions are 1 ^st swirl: 200 x 24 mm, combustion furnace: 200 x 200 mm, and swirl flow guide groove: 4 x 4 mm, 4 pieces.

As shown in the simulation results, it can be seen that the rotational speed value increases as the angle of the helical angle increases.

It can be seen that as the rotational speed value increases, the intensity of the swirling flow increases.

Thus, if the swirling flow strength of the solid fuel is increased, the mixing ratio with the oxidizing agent can be increased. Therefore, it is preferable that the swirling flow can be selectively applied according to the supply amount of the solid fuel.

The fuel supply nozzle 110 in which the swirling flow guide groove 10 is formed is detachably attached to the fuel supply pipe 130 provided in the burner 100 and a not shown technical structure. At this time, it is preferable to use a screw coupling method, which is a known method, and it is sufficient that it can be detached by a known method such as a fastening groove and a fastening protrusion.

It is preferable to optimize the mixing ratio with the oxidizing agent depending on the capacity and use of the burner by making it possible to selectively use the fuel supply nozzle made with a different angle of the swirling flow guide groove depending on the capacity or use of the burner Do.

10: Swirl flow guide groove
100: burner 110: fuel supply nozzle
120: oxidant supply pipe 130: fuel supply pipe

Claims

1. A fuel supply nozzle provided in a burner for supplying a solid fuel to be mixed with an oxidant and burned,
Wherein a spiral swirling flow guide groove for forming a swirling flow by the supply pressure of the solid fuel supplied without vanes to the inner surface of the fuel supply nozzle is provided.

The method according to claim 1,
Wherein at least one of the swirling flow guide grooves is formed.

The method according to claim 1,
Wherein the spiral angle of the swirling flow guide groove is formed within an acute angle range with a horizontal line of the center of the fuel supply nozzle.

11. The method according to any one of claims 1 to 3,
Wherein the fuel supply nozzle is detachably provided to the fuel supply pipe.