KR102553242B1 - Combustion burner apparatus using superheated steam - Google Patents

Abstract

The present invention relates to a burner using superheated steam, and more particularly, to a burner with improved air flow and fuel and steam injection structures.
The burner using superheated steam of the present invention includes an inner tube forming a main combustion space, an outer tube spaced apart from the inner tube and surrounding the inner tube, a first bottom plate supporting the outer tube and the inner tube from the lower portion, and a lower portion of the first bottom plate An auxiliary space forming unit installed in the main combustion space and forming an auxiliary space communicating with the main combustion space, a nozzle body mounted on the first bottom plate and having a fuel injection hole and a steam injection hole, and a fuel injection hole for supplying fuel for combustion. A fuel supply unit, a heating tube installed in the inner tube so that it can be heated in the inner tube and one end connected to the steam injection hole, a spray processing unit for supplying water in a spray state into the heating tube, an auxiliary space forming unit, and a first blower pipe. A first blower coupled to blow air into the auxiliary space, and a guide ring installed in the inner tube to guide the flow of air passing around the nozzle body in a specific direction when air is introduced into the main combustion space by the first blower provide

Description

Combustion burner apparatus using superheated steam}

The present invention relates to a burner using superheated steam, and more particularly, to a burner with improved air flow and fuel and steam injection structure.

A general fuel combustion device has a structure in which fuel supplied from a fuel supply source is injected through a nozzle and the injected fuel is burned inside a combustion chamber.

Such a fuel combustion device that directly burns only fuel is limited to the inherent thermal power of the fuel source, and when an inexpensive liquid fuel such as bunker oil is used, there is a disadvantage of causing air pollution due to incomplete combustion during combustion.

In order to solve these problems, recently, studies have been actively conducted to induce complete combustion and reinforce thermal power through pulverization and activation of fuel by injecting and burning inexpensive liquid fuel with high-temperature steam obtained by heating water.

That is, steam that is heated by a burning flame and passes through a heated steam generating pipe such as a spirally rolled metal coil pipe for vaporizing water to obtain high-pressure steam and to burn it while directly injecting it with liquid fuel. A fuel combustion device using has been developed.

The thermal decomposition property, in which water vapor is dissociated into hydrogen and oxygen when it is at a high temperature, is a principle claimed by French chemist Lavoisier. It is an experiment that confirmed that hydrogen is generated when a metal tube is heated to a high temperature to make it glow and water passes through the metal tube. It is known that when carbon (C) is supplied, water decomposes into carbon dioxide and hydrogen gas. In addition, by injecting the fuel at a high pressure together with the high-temperature steam, the fuel is finely injected in an activated state by the high temperature, resulting in stronger thermal power and complete combustion.

However, fuel combustion devices using steam developed so far require a separate pumping device to supply water to the steam generating pipe, and the water supply by the pumping device is unconditionally supplied in a constant amount, so the amount of steam generated can be controlled independently. It has many disadvantages, such as difficulty in preheating and ignition, difficulty in controlling the injection amount of fuel and steam, and in case the water supply pressure control fails, water accumulates in the steam generating pipe or even in the nozzle where fuel and steam are to be injected. It has a waste end through which water is sprayed.

As a technology for solving the above problems, Korean Patent Registration No. 10-2018297 discloses a combustion burner device using superheated steam.

The combustion burner device forms a main combustion space and extends upwards, an inner tube formed to surround the inner tube to form a spaced space spaced apart from the inner tube and extending upwards higher than the inner tube, and the lower end of the inner tube and the exterior A first bottom plate coupled horizontally across the lower end and closing the lower portion of the spaced space, and an auxiliary space forming part extending downward from the first bottom plate to form an auxiliary space communicating with the main combustion space; A nozzle body mounted on the bottom plate and provided with a fuel injection nozzle and a steam injection nozzle, a fuel supply unit for supplying fuel for combustion through the fuel injection nozzle, and a winding part spirally wound and extended so that it can be heated in the inner tube. It has a heating tube having one end extending from the winding portion connected in communication with the steam injection nozzle of the nozzle body, and a spray treatment unit connected through the other end of the heating tube to supply water into the heating tube in a spray state. According to the combustion burner device using such superheated steam, an initial warm-up time can be shortened and a combustion structure can be simplified.

However, in the combustion burner device, since fuel and high-temperature steam are mixed at the inlet of the inner tube and combustion is performed, the flame spreads widely, so the heating tube mounted in the inner tube may be damaged by the high temperature.

Republic of Korea Patent Registration No. 10-2018297: Combustion burner device using superheated steam

The present invention was created to improve the above problems, by changing the flow of air flowing into the inner tube and improving the injection structure of fuel and steam to prevent direct contact of the flame with the heating tube located in the inner tube, Its object is to provide a burner capable of suppressing high heat damage.

A burner using superheated steam of the present invention for achieving the above object includes an inner tube forming a main combustion space; an exterior spaced apart from the inner tube and formed to surround the inner tube; a first bottom plate supporting the exterior and the interior tube from a lower portion; an auxiliary space forming unit installed under the first bottom plate to form an auxiliary space communicating with the main combustion space; a nozzle body mounted on the first bottom plate and having a fuel injection hole and a steam injection hole; a fuel supply unit for supplying combustion fuel to the fuel injection hole; a heating tube installed in the inner tube to be heated in the inner tube and having one end connected to the steam injection hole; a spray processing unit for supplying water in a misted state into the heating pipe; a first blower coupled to the auxiliary space forming unit and a first blower pipe to blow air into the auxiliary space; and a guide ring installed in the inner tube to guide the flow of air passing around the nozzle body in a specific direction when air is introduced into the main combustion space by the first blower.

The guide ring has a narrow upper part and a wider lower part, and the upper part of the nozzle body is inserted into the inner side.

On the inner surface of the guide ring, guide ribs formed long in the vertical direction protrude at regular intervals.

Each end of the fuel injection hole and the steam injection hole is inclined at a predetermined angle.

An inclination angle of each end of the fuel injection hole and the steam injection hole is 20 to 40°.

As described above, the present invention changes the flow of air introduced into the inner pipe by installing a guide ring around the nozzle body. In addition, by limiting the ends of the fuel injection hole and the steam injection hole to a certain angle, it is possible to improve the fuel and steam injection structure.

Accordingly, the present invention can prevent flames from directly contacting the heating tube located in the inner tube to suppress high-temperature damage to the heating tube, thereby increasing the durability of the burner.

1 is a cross-sectional view of a burner according to an embodiment of the present invention;
Figure 2 is an enlarged view showing an extract of the main part of Figure 1,
Figure 3 is a cross-sectional view showing the operation of Figure 1,
4 is an enlarged view showing the main part of another burner according to another example of the present invention;
5 is a cross-sectional view of a burner according to another example of the present invention;
6 is a plan view of the heating tube applied to FIG. 5;
7 is a cross-sectional view of a burner according to another example of the present invention.

Hereinafter, a burner using superheated steam according to a preferred embodiment of the present invention will be described in detail.

1 to 3, the burner 100 using superheated steam of the present invention is spaced apart from the inner tube 121 forming the main combustion space 112, and the inner tube 121 is surrounded. The exterior 131 formed longer than the inner tube 121, the first bottom plate 125 supporting the exterior 131 and the inner tube 121 from the bottom, and installed at the bottom of the first bottom plate 125 The auxiliary space forming part 127 forming the auxiliary space 128 communicating with the main combustion space 112 and the fuel injection hole 153 and the steam injection hole 151 mounted on the first bottom plate 125 The formed nozzle body 150, the fuel supply unit 155 for supplying fuel for combustion to the fuel injection hole 153, and the inner tube 121 are installed in the inner tube 121 so that they can be heated, and one end is steam The heating tube 160 connected to the spray hole 151, the spray processing unit 170 for supplying water into the heating tube 160 in a spray state, the auxiliary space forming unit 127, and the first blowing tube 129 The first blower 181 coupled to blow air to the auxiliary space 128 and the air passing around the nozzle body 150 when the air is introduced into the main combustion space 112 by the first blower 181 Equipped with a guide ring 10 installed in the inner tube 121 to guide the flow in a specific direction.

The inner tube 121 forms the main combustion space 112 and extends upward. The inner tube 121 penetrates vertically and is formed in a hollow cylindrical tube shape.

The exterior 131 is formed to surround the inner tube 121 to form a separation space 133 spaced apart from the inner tube 121 and extends upward longer than the inner tube 121 .

The separation space 133 between the exterior 131 and the inner tube 121 has a heat insulating function for the inner tube 121 and complete combustion at the top of the inner tube 121 by the air supplied through the second blower 182. It provides a secondary air supply path that can be made. The upper end extending above the inner tube 121 of the exterior 131 is formed so that the inner diameter gradually narrows. The upper part of the exterior 131 and the upper part of the inner tube 121 are formed to be separated and coupled to each other through a flange 136 extending in a direction in which the outer diameter is extended for ease of assembly and mounting of the inner mounting element.

The first bottom plate 125 is horizontally coupled across the lower end of the inner tube 121 and the lower end of the outer tube 131 and is installed to close the lower part of the separation space 133, and the main combustion space of the inner tube 121 112 and the auxiliary space 128 are formed to be in communication with each other so that the inflow of air is possible.

The auxiliary space forming unit 127 extends downward from the first bottom plate 125 to form an auxiliary space 128 communicating with the main combustion space 112 . The auxiliary space forming unit 127 also provides a space capable of accommodating elements connected to the nozzle body 150 .

The nozzle body 150 is mounted at the center of the first bottom plate 125 and has a fuel injection hole 153 and a steam injection hole 151. The nozzle body 150 has a steam injection hole 151 disposed in the center, and a plurality of fuel injection holes 153 around the steam injection hole 151 are spaced apart from each other. Liquid fuel is injected into the main combustion space 112 through the fuel injection hole 153 .

The fuel injection hole 153 and the steam injection hole 151 have respective ends 153a and 151a inclined at a predetermined angle. For example, the inclination angle θ of each end 153a and 151a of the fuel injection hole 153 and the steam injection hole 151 may be 20 to 40°. Preferably, the inclination angle θ of each end 153a and 151a of the fuel injection hole 153 and the steam injection hole 151 is 30°. Here, the inclination angle θ is an angle with respect to a moving direction of fluid moving along the fuel injection hole 153 and the steam injection hole 151 .

In this way, by limiting the inclination angles of the ends of the fuel injection hole 153 and the steam injection hole 151 to the range of 20 to 40 °, it is possible to limit the injection angle of fuel and steam. Therefore, it is possible to prevent the flame from spreading widely.

The fuel supply unit 155 supplies fuel for combustion to the fuel injection hole 153 . A liquid fuel such as diesel or kerosene may be used as a fuel for combustion. A first valve 158 for controlling fuel supply is mounted on the fuel supply pipe 157 connected from the fuel supply unit 155 to the fuel injection hole 153. Although not shown, an ignition device 159 is installed in the nozzle body 150 to initially ignite the fuel injected through the fuel injection hole 153.

The heating tube 160 is heated by the flame 1. Water moving along the heating pipe 160 becomes high-temperature steam.

The heating tube 160 extends from one end of the winding line part 160a supported by the support 165 installed in the inner tube 121 and the winding line part 160a, and the water sprayed from the spray treatment part 170 flows in. It consists of a low online part 160b and a high online part 160c extending from the other end of the winding line part 160a and passing through the inside of the winding line part 160a and connected to the nozzle body 150.

The winding line portion 160a is formed by winding in a spiral shape. Since the flame 1 passes through the inside of the winding line part 160a, water is vaporized while being heated to a high temperature in the winding line part 160a.

The low-line part 160b extends in a straight line from the lower part of the winding line part 160a and is connected to the spray treatment part 170. Water sprayed from the spray processing unit 170 is introduced through the low-line unit 160b.

The high line part 160c extends straight from the top of the winding line part 160b and is connected to the inlet of the steam injection hole 151 of the nozzle body 150. The steam heated to a high temperature flows into the nozzle body 150 through the high online part 160c.

The spray processing unit 170 is connected to the heating tube 160 and supplies water into the heating tube 160 in a spray state to make water mist into fine particles. The spray treatment unit 170 includes a water supply unit 172, a preheater 174, a high-pressure spray unit 175, a spray pipe 176, and a nozzle 177.

The water supply unit 172 supplies water through a water pipe 173 extending in series with the injection pipe 176 . The water supply unit 172 may be constructed in various ways, such as a tank in which water is stored or a commercial water supply pipe supplying water through a water pipe 173.

The preheater 174 is mounted outside the water pipe 173 and first preheats the water supplied through the water pipe 173 by heating it. The preheater 174 may be built to heat in various ways, such as a heater capable of heating while surrounding the water pipe 173. The temperature of the water heated by the preheater 174 may be appropriately applied in relation to the scale and supply capacity of the apparatus.

The high-pressure injection unit 175 converts the water supplied through the water pipe 173 into a high-pressure state to be sprayed in a mist-like state through the nozzle 177 of the injection pipe 176 connected in series with the water pipe 173. supply The high-pressure injection unit 175 may be a pump that pumps and supplies water supplied through the water pipe 173 in a pressurized state.

The injection pipe 176 extends from the high-pressure injection part 175 and is installed to be inserted into the low-line part 160b of the heating pipe 160. A nozzle 177 is mounted at an end of the injection pipe 176. Through the nozzle 177, water is supplied to the low-line part 160b in a mist state.

Reference numeral 178 is a valve that opens and closes the passage of the injection pipe 176.

The first blower 181 is coupled to a first blower pipe 129 provided in communication with the auxiliary space 128 under the auxiliary space forming unit 127 . The first blower 181 blows air into the auxiliary space 128 . The air introduced into the auxiliary space 128 passes through the first bottom plate 125 and is introduced into the main combustion space 112 .

Meanwhile, a second blower 182 may be further provided to introduce air into the separation space 133 between the exterior 131 and the interior tube 121 . The second blower 182 is connected through a second blower pipe 132 that is connected at an angle to the outer pipe 131 and communicates with the spaced space 133, and air enters the space above the inner pipe 121 through the spaced space 133. supply

The nitrogen oxide reducing member 190 is installed inside the exterior 131 of the upper part of the inner tube 121, has a wide lower part and a narrow upper part, and is formed in a truncated conical shape with a plurality of through holes 192 perforated on the outer circumferential surface. . The nitrogen oxide reducing member 190 has an inner circumferential surface 194 coated with palladium (Pd) and an outer circumferential surface 196 coated with rhodium (Rh). The nitrogen oxide reducing member 190 functions as a catalytic converter that converts nitrogen oxides generated in an unstable state by a reaction between nitrogen and oxygen during a combustion process to be decomposed into nitrogen and oxygen, thereby reducing air pollution.

In the above-described present invention, the fuel supplied from the fuel supply unit 155 and injected through the fuel injection hole 153 is initially ignited by the ignition device 159 and burned. The heating pipe 160 is heated by the flame 1 generated by the combustion of fuel, and the water moving along the heating pipe 160 becomes high-temperature superheated steam through the steam injection hole 151 to the main combustion space. (112) is injected. Since the high-temperature steam injected through the steam injection hole 151 is injected into the flame 1, the temperature of the flame 1 is increased by intensifying the thermal power while being gasified immediately after injection. Accordingly, complete combustion of the burner may be induced and thermal efficiency may be increased.

The guide ring 10 is installed on the inner lower part of the inner tube 121. The guide ring 10 serves to guide the flow of air passing around the nozzle body 150 in a specific direction when air is introduced into the main combustion space 112 by the first blower 181 .

In the illustrated example, the guide ring 10 is formed in a conical shape. That is, the guide ring 10 has a narrow top and a wide bottom. Therefore, the guide ring 10 is made inclined. For example, the inclination angle of the guide ring 10 is appropriately 60 to 80 °. The conical guide ring 10 converges the flow of air toward the center of the main combustion space 112 .

The inner diameter of the upper side of the guide ring 10 is smaller than the inner diameter of the winding line portion 160a of the heating tube 160 and larger than the outer diameter of the nozzle body 150.

The guide ring 10 is fixed to the inside of the inner tube 121 by a plurality of support members 15 . The upper part of the nozzle body 150 is inserted inside the guide ring 10 . And, of course, a passage groove through which the heating tube 160 passes is formed on one side of the guide ring 10 so that the heating tube 160 can extend from the main combustion space 112 to the auxiliary space 128.

When air is introduced into the main combustion space 112 by the first blower 181, the air inside the guide ring 10 forms a flow converging toward the center of the nozzle body 150. Accordingly, the fuel injected from the fuel injection hole 153 and the steam injected from the steam injection hole 151 are prevented from spreading widely.

As such, the present invention suppresses the wide spread of the flame 1 by installing the guide ring 10 around the nozzle body 150 to change the flow of air introduced into the main combustion space 112. In addition, by limiting the ends of the fuel injection hole 153 and the steam injection hole 151 at a certain angle, it is effective to suppress the wide spread of the flame 1.

The present invention described above can prevent the flame 1 from directly contacting the heating tube 160 located in the inner tube 121, thereby suppressing high-temperature damage to the heating tube 160.

Meanwhile, another example of guide ring is shown in FIG. 4 .

Referring to FIG. 4 , a plurality of guide ribs 11 are formed on the inner surface of the guide ring 10 . A plurality of guide ribs 11 are radially disposed toward the center of the inner tube 121 .

The guide lip 11 is formed long in the vertical direction. A plurality of guide ribs 11 are formed at regular intervals. Guide lip 11 protrudes in the inner direction of the guide ring (10).

When air passes through the guide ring 10, the guide lip 11 serves to promote convergence of the air. Therefore, it is possible to suppress the wide spread of the flame more effectively.

Another embodiment of the present invention is shown in FIGS. 5 and 6 . The burner shown in FIGS. 5 and 6 has a structure of a heating tube different from that of FIG. 1 .

5 and 6, the heating tube 200 is formed by being wound in a spiral, and a winding line unit 200a installed on the upper side of the inner tube 121 so as to be spaced apart from the nozzle body 150, and the winding line unit Extends in a straight line from one end of (200a) and is connected to the spray processing unit 170, and extends in a straight line from the other end of the low online portion 200b into which water sprayed from the spray processing unit 170 flows, and the winding line unit 200a. and a high online part 200c connected to the steam injection hole 151 via the outside of the winding line part 200a.

The winding line portion 200a is formed by being spirally wound. Since the flame 1 passes through the inside of the winding line part 200a, water is vaporized while being heated to a high temperature in the winding line part 200a.

The illustrated winding line portion 200a is installed on the upper side of the inner tube 121. That is, the winding line portion 200a is located between the middle and the upper end of the inner tube 121 . 1, the winding line part 160a is formed from the bottom to the top of the inner pipe 121, whereas in FIG. 5, the winding line part 200a is installed only on the upper side of the inner pipe 121.

The low-line part 200b extends in a straight line from the lower part of the winding line part 200a and is connected to the spray treatment part 170. Water sprayed from the spray processing unit 170 is introduced through the low-line unit 200b. The low-line part 200b is formed to be positioned outside the winding line part 200a. This is to minimize contact with flames.

The high online part 200c extends straight from the top of the winding line part 200a and is connected to the inlet of the steam injection hole 151 of the nozzle body 150. Steam heated to a high temperature flows into the nozzle body 150 through the high online part 200c. The high online part 200c is connected to the steam injection hole 151 via the outside of the winding line part 200a. This is to minimize the contact of the high online part 200c with the flame together with the low online part 200b.

As described above, the winding line part 200a is not formed on the inner lower part of the inner tube 121, but the winding line part 200a is formed only on the inner upper part of the inner tube 121, and at the same time, the low online part 200b and high online By locating the portion 200c outside the winding line portion 200a, high-temperature damage to the heating tube 200 due to contact with flame can be further suppressed.

In addition, as shown in FIG. 7, a flame blocking pipe 210 may be further installed inside the inner pipe 121.

Referring to FIG. 7 , the flame blocking pipe 210 has a cylindrical structure with open top and bottom. The flame blocking pipe 210 is located at the inner lower part of the inner pipe 121 where the winding line portion 200a is not formed. The outer diameter and the inner diameter of the flame cutoff tube 210 may be formed to be the same as the outer diameter and inner diameter of the winding line part 200a, respectively.

The low online part (200b) and the high online part (200c) are located outside the flame blocking pipe (210). Therefore, the flame generated by the combustion of the fuel in the fuel injection hole 153 passes through the inside of the flame blocking pipe 210 and passes through the inside of the winding line portion 200b.

Since the low online part 200b and the high online part 200c are located outside the flame cut-off tube 210, the flame does not directly contact the low online part 200b and the high online part 200c. The flame breaker 210 may be formed of a ceramic material having excellent heat blocking effect and excellent durability and fire resistance.

And, although not shown, a heat radiation tube capable of transferring heat to the winding line unit by being in contact with the flame may be installed inside the winding line unit 200a.

In the above, the present invention has been described with reference to one embodiment, but this is only exemplary, and those skilled in the art will understand that various modifications and equivalent embodiments are possible therefrom. Therefore, the true protection scope of the present invention should be determined only by the attached claims.

10: guide ring 15: support member
100: burner 121: inner tube
125: bottom plate 131: exterior
150: nozzle body 155: fuel supply unit
160: heating pipe 170: spray treatment unit

Claims (7)

an inner tube forming a main combustion space;
an exterior spaced apart from the inner tube and formed to surround the inner tube;
a first bottom plate supporting the exterior and the interior tube from a lower portion;
an auxiliary space forming unit installed under the first bottom plate to form an auxiliary space communicating with the main combustion space;
a nozzle body mounted on the first bottom plate and having a fuel injection hole and a steam injection hole;
a fuel supply unit for supplying combustion fuel to the fuel injection hole;
a heating tube installed in the inner tube to be heated in the inner tube and having one end connected to the steam injection hole;
a spray processing unit for supplying water in a misted state into the heating pipe;
a first blower coupled to the auxiliary space forming unit and a first blower pipe to blow air into the auxiliary space;
A guide ring installed in the inner tube to guide the flow of air passing around the nozzle body in a specific direction when air is introduced into the main combustion space by the first blower,
The steam injection hole is disposed at the center of the nozzle body, and a plurality of fuel injection holes are spaced apart from each other around the steam injection hole,
Each end of the fuel injection hole and the steam injection hole is inclined at a predetermined angle,
The guide ring is formed in a conical shape with a narrow top and a wide bottom to converge the flow of air to the center of the main combustion space, and the upper part of the nozzle body is inserted inside the guide ring,
On the inner surface of the guide ring, guide ribs formed long in the vertical direction protrude at regular intervals, and the guide ribs are radially disposed toward the center of the inner tube,
The heating tube is formed by being wound in a spiral form, and a winding line part installed on the upper side of the inner tube so as to be spaced apart from the nozzle body, and extending in a straight line from one end of the winding line part to be connected to the spray processing unit, and spraying from the spray processing unit A low online part into which water flows, and a high online part extending in a straight line from the other end of the winding line part and connected to the steam injection hole via the outside of the winding line part,
The burner using superheated steam, characterized in that the low online part is formed to be located in an outer region of the winding line part. delete delete delete The burner according to claim 1, wherein an inclination angle of each end of the fuel injection hole and the steam injection hole is 20 to 40°. delete The overheating according to claim 1, further comprising a flame cut-off tube installed inside the inner tube and located below the winding line part to block contact with the low-line part and the high-line part from contact with flame. Burner with steam.

Images