JP2022012927A - Low flammability fuel combustion device - Google Patents

Abstract

To enable stable combustion by mixing low flammability fuel with combustion air and suppress generation of NOx caused by an increase in a flame temperature during the combustion of the low flammability fuel.SOLUTION: A primary air supply pipe 20 guiding primary combustion air A1 to a forward side in a feeding direction of a fuel supply pipe 11 while turning the primary combustion air along the outer periphery of the fuel supply pipe is provided on the outer peripheral side of the fuel supply pipe including a jet port 11 jetting out low flammability fuel G. A secondary air supply pipe 30 guiding secondary combustion air A2 to a forward side in a feeding direction of the primary air supply pipe while turning the secondary combustion air along the outer periphery of the primary air supply pipe is provided on the outer peripheral side on the downstream side in the feeding direction of the primary air supply pipe.SELECTED DRAWING: Figure 1

Description

The present invention relates to a low-combustion fuel combustion apparatus that mixes low-combustible fuel supplied through a fuel supply pipe with combustion air supplied through an air supply pipe and burns the fuel. In particular, it is characterized in that a low-combustible fuel is mixed with combustion air to enable stable combustion and to suppress the generation of NOx during combustion.

In a combustion device that mixes fuel with combustion air and burns it, a fuel that uses a hydrocarbon-based fuel is generally used.

However, when a hydrocarbon fuel is mixed with combustion air and burned in such a combustion device, there is a problem that a large amount of greenhouse gas such as carbon dioxide is generated.

Therefore, in recent years, it has been requested to reduce greenhouse gases such as carbon dioxide, and it is considered to use a fuel other than a hydrocarbon fuel.

Further, conventionally, it has been known to use ammonia, which is a low combustible fuel, as a fuel in a combustion device. However, ammonia has a problem that it is inferior in flammability as compared with a hydrocarbon fuel, and it is easy to misfire at the time of combustion, and it is easy to generate NOx at the time of combustion.

Conventionally, in combusting ammonia, which is a low-combustible fuel having poor combustibility, a diffuser is arranged on the downstream side of a burner chip that ejects ammonia into the fuel, as shown in Patent Document 1, to naturally disperse the ammonia. Along with the sucked combustion air, the area around the diffuser is bypassed and mixed, and the ammonia and the combustion air mixed in this way are made into a vortex state and retained on the upper side of the diffuser to be burned and burned. Something that enhances sex has been proposed.

However, when the combustion air is naturally sucked as in Patent Document 1, it is difficult to use it in a large-scale combustion device that burns a large amount of ammonia, and as described above, the ammonia and the combustion air are in a vortex state. When the ammonia is burned at once by staying on the upper side of the diffuser, there is also a problem that the flame temperature at the time of combustion becomes high and the generation of NOx increases.

Further, in Patent Document 2, after premixing and homogenizing ammonia as a low combustible fuel and combustion air, the gas premixed in this way is swirled by a swirl and burned while being strongly agitated. It has been proposed to improve the combustibility of ammonia.

However, as in Patent Document 2, when the gas obtained by premixing ammonia and combustion air is swirled by a swirl and burned while being strongly agitated, ammonia is generated as in the case of Patent Document 1. There was a problem that it was burned at once, the flame temperature became high, and the generation of NOx increased.

Jikkensho 50-8257 Gazette Japanese Unexamined Patent Publication No. 2016-130619

An object of the present invention is to solve the above-mentioned problems in the case where a low combustible fuel such as ammonia is mixed with combustion air and burned.

That is, in the present invention, when a low combustible fuel such as ammonia is mixed with combustion air and burned as described above, the low combustible fuel is appropriately mixed with the combustion air to obtain a low combustible fuel. It is an object of the present invention to enable stable combustion and to prevent low combustible fuel from being burned at once to raise the flame temperature at the time of combustion and generate NOx.

In the low-combustion fuel combustion apparatus according to the present invention, in order to solve the above-mentioned problems, primary combustion air is fueled on the outer peripheral side of the fuel supply pipe provided with the ejection port for ejecting the low-combustible fuel. A primary air supply pipe is provided to guide the fuel supply pipe forward in the feed direction while swirling along the outer circumference of the supply pipe, and secondary combustion air is supplied to the outer circumference on the downstream side of the feed direction of the primary air supply pipe. A secondary air supply pipe was provided to guide the primary air supply pipe forward in the feed direction while swirling along the outer circumference of the pipe.

Then, in the low-combustion fuel combustion device according to the present invention, ammonia is used as the low-combustible fuel.

Here, in the low-combustion fuel combustion apparatus according to the present invention, a spout for ejecting the low-combustion fuel is provided at the tip of the fuel supply pipe, and the low-combustion fuel ejected from the spout is provided. , While swirling along the outer circumference of the fuel supply pipe in the primary air supply pipe, mix with the primary combustion air guided forward in the feed direction of the fuel supply pipe so that a part of the low combustion fuel remains. The primary combustion gas, which is primarily burned in the primary air supply pipe and the low combustible fuel remaining after the primary combustion remains, is guided from the primary air supply pipe to the above-mentioned secondary air supply pipe, and is primary in the secondary air supply pipe. The low combustible fuel remaining in the primary combustion gas is mixed with the secondary combustion air guided forward in the feed direction of the primary air supply pipe while being swirled along the outer circumference of the air supply pipe, and the low combustible fuel remaining in the primary combustion gas is contained in the secondary air supply pipe. Can be used for secondary combustion.

In this way, the low-combustible fuel ejected from the ejection port provided at the tip of the fuel supply pipe is guided forward in the feed direction of the fuel supply pipe while being swirled along the outer periphery of the fuel supply pipe in the primary air supply pipe. When the fuel is mixed with the prepared primary combustion air and the primary combustion is performed so that a part of the low combustion fuel remains in the primary air supply pipe, the low combustible fuel is sufficiently mixed with the primary combustion air. Along with stable combustion, it is prevented that the flame temperature at the time of primary combustion becomes high, and the generation of NOx is suppressed. In addition, the primary combustion gas in which the low combustible fuel remains after the primary combustion is guided from the inside of the primary air supply pipe into the secondary air supply pipe, and swirls along the outer periphery of the primary air supply pipe in the secondary air supply pipe. However, when it is mixed with the secondary combustion air guided forward in the feed direction of the primary air supply pipe and secondary combustion is performed in the secondary air supply pipe, the low combustible fuel remaining in the primary combustion gas is secondary. It is sufficiently mixed with combustion air to ensure stable combustion, and by burning in two stages, the flame temperature during secondary combustion is prevented from becoming high, and the generation of NOx is suppressed. Will be done.

Here, when the jets are provided at the tip of the fuel supply pipe as described above, a plurality of jets for ejecting low-combustion fuel to the outer periphery may be provided radially on the outer periphery of the tip of the fuel supply pipe. preferable. In this way, low-combustion fuel is ejected from the plurality of radially provided ejection ports toward the outer peripheral side of the fuel supply pipe, and the low-combustion fuel ejected in this way is discharged by the primary air supply pipe to the fuel supply pipe. It is sufficiently mixed with the primary combustion air guided forward in the feed direction of the fuel supply pipe while being swirled along the outer circumference of the fuel supply pipe, so that stable primary combustion is achieved in the primary air supply pipe.

Further, in the low-combustion fuel combustion apparatus according to the present invention, the amount of primary combustion air supplied to the primary air supply pipe and the amount of secondary combustion air supplied to the secondary air supply pipe. The ratio to the amount is preferably in the range of 50:50 to 20:80. In this way, when the low combustible fuel ejected from the ejection port at the tip of the fuel supply pipe is mixed with the primary combustion air and first combusted in the primary air supply pipe, the low combustion fuel is in the primary air supply pipe. A part of the low combustible fuel remains without being completely burned, and during the primary combustion, the flame temperature is prevented from rising significantly, and the generation of NOx is suppressed. Next, the primary combustion gas remaining after the primary combustion in the primary air supply pipe is guided into the secondary air supply pipe, and the low combustible fuel remaining in the primary combustion gas is the secondary air. Since the secondary combustion is mixed with the secondary combustion air in the supply pipe, the flame temperature is prevented from rising significantly even during the secondary combustion, and the generation of NOx is suppressed.

In the low-combustion fuel combustion device of the present invention, the low-combustible fuel ejected from the ejection port provided in the fuel supply pipe as described above is swirled along the outer periphery of the fuel supply pipe in the primary air supply pipe. It is mixed with the primary combustion air guided forward in the feed direction of the fuel supply pipe, and primary combustion is performed so that a part of the low combustion fuel remains in this primary air supply pipe, and the low combustible fuel after the primary combustion is released. The remaining primary combustion gas is guided from the primary air supply pipe into the secondary air supply pipe, and is swirled along the outer circumference of the primary air supply pipe in the secondary air supply pipe to the front in the feed direction of the primary air supply pipe. It was mixed with the induced secondary combustion air for secondary combustion in this secondary air supply pipe.

As a result, in the low-combustion fuel combustion apparatus of the present invention, by swirling the combustion air, it is possible to mix the low-combustion fuel, which is difficult to burn, well with the combustion air to facilitate combustion. Since the low-combustible fuel is divided into the two stages of primary combustion and secondary combustion in which the low-combustible fuel is mixed with combustion air and burned, the low-combustible fuel is not burned at once and the flame temperature does not become high. The generation of NOx is appropriately suppressed, and the low combustible fuel is sufficiently mixed with the primary combustion air and the secondary combustion air to be stably burned.

It is schematic cross-sectional explanatory drawing which showed the structure of the low combustion fuel combustion apparatus which concerns on one Embodiment of this invention. It is a schematic vertical sectional view which showed the state which the part of the primary air supply pipe was cut in the vertical direction in the low combustion fuel combustion apparatus which concerns on the same embodiment. It is a schematic vertical sectional view which showed the state which the part of the secondary air supply pipe was cut in the vertical direction in the low-combustion fuel combustion apparatus which concerns on the same embodiment. In the low-combustion fuel combustion apparatus according to the same embodiment, the ratio of the amount of primary combustion air supplied to the primary air supply pipe and the amount of secondary combustion air supplied to the secondary air supply pipe. It is a schematic explanatory diagram which showed the state which the generation amount of NOx changes when the ammonia gas is burned by changing.

Hereinafter, the low-combustion fuel combustion apparatus according to the embodiment of the present invention will be specifically described with reference to the accompanying drawings. The low-combustion fuel combustion apparatus according to the present invention is not limited to the one shown in the following embodiment, and can be appropriately modified and implemented without changing the gist of the invention.

In the low-combustion fuel combustion apparatus of this embodiment, as shown in FIG. 1, the ammonia gas G is placed on the outer periphery of the tip of the fuel supply pipe 10 for supplying the low-combustible fuel ammonia gas G in the feed direction. A plurality of ejection ports 11 for radially ejecting toward the outer peripheral side of the fuel supply pipe 10 are provided radially so as to pass through a required interval in the circumferential direction.

Further, as shown in FIG. 2, the primary combustion air A1 guided from the primary air introduction unit 21 is introduced to the outer peripheral side of the fuel supply pipe 10 from the tangential direction of the fuel supply pipe 10, and the fuel supply pipe 10 is introduced. The primary air supply pipe 20 is provided so as to be swiveled along the outer periphery of the fuel supply pipe 10 and to be guided forward in the feed direction from the tip of the fuel supply pipe 10.

Further, as shown in FIG. 3, the secondary combustion air A2 guided from the secondary air introduction unit 31 is provided on the outer peripheral side of the primary air supply pipe 20 on the downstream side in the feed direction. A secondary air supply pipe 30 is provided which is introduced from the tangential direction of 20 and is guided forward in the feed direction of the primary air supply pipe 20 while swirling along the outer periphery of the primary air supply pipe 20.

As described above, by introducing the primary combustion air A1 and the secondary combustion air A2 from the tangential direction of the fuel supply pipe 10 and the primary air supply pipe 20, a strong turning force can be obtained.

Here, in the low-combustion fuel combustion apparatus of this embodiment, the ammonia gas G is supplied from each of the ejection ports 11 radially provided on the outer periphery of the tip portion of the fuel supply pipe 10 in the feed direction. The fuel supply pipe 10 is ejected radially into the primary air supply pipe 20 toward the outer peripheral side of the fuel, and the primary combustion air A1 guided from the primary air introduction unit 21 into the primary air supply pipe 20 is blown into the primary air supply pipe 20. The fuel supply pipe is fed to the tip of the primary air supply pipe 20 in the feeding direction while swirling along the outer periphery of the fuel, and the primary combustion air A1 is mixed with the ammonia gas G ejected from each ejection port 11 as described above. 10 is guided forward in the feed direction.

Then, in this way, the ammonia gas G and the primary combustion air A1 are mixed and guided forward in the feed direction of the fuel supply pipe 10 to ignite the mixed gas by a spark plug (not shown), and the primary combustion air A is ignited. The amount is made smaller than the theoretical air ratio (μ = 1) so that a part of the ammonia gas G remains, and the mixed gas is introduced in the primary air supply pipe 20 in front of the feed direction of the fuel supply pipe 10. I try to make it primary combustion.

Then, in this way, the primary combustion gas in which the ammonia gas G remaining after the primary combustion in the primary air supply pipe 20 remains is guided from the primary air supply pipe 20 into the secondary air supply pipe 30. There is.

Then, the primary combustion gas in which the ammonia gas G led from the primary air supply pipe 20 to the secondary air supply pipe 30 remains is transferred to the secondary air from the secondary air introduction unit 31 as described above. The secondary combustion air A2 and the secondary air supply pipe 30 introduced into the supply pipe 30 and guided forward in the feed direction of the primary air supply pipe 20 while being swirled along the outer periphery of the primary air supply pipe 20. The ammonia gas G remaining in the primary combustion gas is mixed in the secondary air supply pipe 30 so as to be secondary-combusted in the secondary air supply pipe 30.

Here, as described above, in the primary air supply pipe 20, the primary combustion air A1 is swirled along the outer periphery of the fuel supply pipe 10, and the ammonia is radially ejected from each outlet 11 of the fuel supply pipe 10. When mixed with the gas G, the ammonia gas G is sufficiently mixed with the primary combustion air A1 so that the primary combustion is stably performed in the primary air supply pipe 20, and a part of the ammonia gas G remains. In this way, since the mixed gas is primarily combusted in the primary air supply pipe 20, the ammonia gas G is not completely combusted in the primary air supply pipe 20, and the flame temperature during the primary combustion is prevented from rising significantly. , NOx is suppressed.

Further, the primary combustion gas in which the ammonia gas G remains after the primary combustion is guided into the secondary air supply pipe 30, and the primary combustion gas in which the ammonia gas G remains is referred to as the secondary air as described above. When it is mixed with the secondary combustion air A2 sent while swirling along the outer periphery of the primary air supply pipe 20 in the supply pipe 30 and secondary combustion is performed, the ammonia gas G remaining in the primary combustion gas is secondary. It is sufficiently mixed with the secondary combustion air A2 so that it can be stably secondarily burned, and the remaining primary combustion gas G after the primary combustion is secondarily combusted, so that the combustion is secondary. Divided into stages, it is prevented that the flame temperature at the time of secondary combustion rises significantly, and the generation of NOx is suppressed.

Here, the ratio of the amount of the primary combustion air A1 supplied to the primary air supply pipe 20 and the amount of the secondary combustion air A2 supplied to the secondary air supply pipe 30 is changed. The changes in the amount of NOx generated when the ammonia gas G was first-combusted and second-combusted were investigated, and the results are shown in FIG. As a result, the ratio of the amount of the primary combustion air A1 supplied to the primary air supply pipe 20 to the amount of the secondary combustion air A2 supplied to the secondary air supply pipe 30 is 50:50 or more. It was found that the range of 20:80 was preferable. By doing so, the amount of NOx generated is suppressed to about 300 ppm or less.

Further, in the embodiment shown in the figure, an example of an open type burner is shown as a combustion device, but it goes without saying that it can also be used for a radiant tube type burner.

10: Fuel supply pipe 11: Injection port 20: Primary air supply pipe 21: Primary air introduction section 30: Secondary air supply pipe 31: Secondary air introduction section A1: Primary combustion air A2: Secondary combustion air G : Ammonia gas (low combustible fuel)

In the low combustible fuel combustion apparatus according to the present invention, in order to solve the above-mentioned problems, the primary combustion air is fueled on the outer peripheral side of the fuel supply pipe provided with the spout for ejecting the low combustible fuel. A primary air supply pipe is provided to guide the fuel supply pipe forward in the feed direction while swirling along the outer circumference of the supply pipe, and secondary combustion air is supplied to the outer circumference on the downstream side of the feed direction of the primary air supply pipe. A secondary air supply pipe is provided to guide the primary air supply pipe forward in the feed direction while swirling along the outer circumference of the air supply pipe , and low combustible fuel is radially applied to the outer circumference on the outer periphery of the tip of the fuel supply pipe. A plurality of spouts to be ejected to the fuel are provided radially, and the low combustible fuel ejected from the spout is swirled along the outer periphery of the fuel supply pipe in the primary air supply pipe in the feeding direction of the fuel supply pipe. It is mixed with the forward-guided primary combustion air while swirling and guided to the tip of the fuel supply pipe, and the primary combustion is performed in the primary air supply pipe so that a part of the low combustible fuel remains, and the primary combustion is performed. The primary combustion gas in which the low combustible fuel remains after being fueled is guided from the inside of the primary air supply pipe into the above-mentioned secondary air supply pipe, and is swirled along the outer periphery of the primary air supply pipe in the secondary air supply pipe to be primary. The low combustible fuel remaining in the primary combustion gas is secondarily burned in the secondary air supply pipe by mixing with the secondary combustion air guided forward in the feed direction of the air supply pipe.

Further , in the low-combustion fuel combustion apparatus according to the present invention, as described above , a plurality of spouts for radially ejecting the low-combustible fuel to the outer peripheral side are provided radially on the outer periphery of the tip of the fuel supply pipe. The low-combustion fuel ejected from the outlet is swirled along the outer periphery of the fuel supply pipe in the primary air supply pipe together with the primary combustion air guided forward in the feed direction of the fuel supply pipe. It is mixed while swirling and guided to the tip of the fuel supply pipe, and the primary combustion is performed in the primary air supply pipe so that a part of the low combustible fuel remains, and the low combustible fuel after the primary combustion remains. The existing primary combustion gas was guided from the inside of the primary air supply pipe into the above-mentioned secondary air supply pipe, and was guided forward in the feed direction of the primary air supply pipe while being swirled along the outer circumference of the primary air supply pipe in the secondary air supply pipe. It is mixed with the air for secondary combustion so that the low combustible fuel remaining in the primary combustion gas is secondarily burned in the secondary air supply pipe.

In this way, the low-combustible fuel ejected from the ejection port provided at the tip of the fuel supply pipe is guided forward in the feed direction of the fuel supply pipe while being swirled along the outer periphery of the fuel supply pipe in the primary air supply pipe. When it is mixed with the primary combustion air to be swirled and mixed and guided to the tip of the fuel supply pipe, and the primary combustion is performed so that a part of the low combustible fuel remains in this primary air supply pipe, the low combustible fuel is obtained. Is sufficiently mixed with the above-mentioned primary combustion air to be stably burned, and the flame temperature at the time of primary combustion is prevented from becoming high, so that the generation of NOx is suppressed. In addition, the primary combustion gas in which the low combustible fuel remains after the primary combustion is guided from the inside of the primary air supply pipe into the secondary air supply pipe, and swirls along the outer periphery of the primary air supply pipe in the secondary air supply pipe. However, when it is mixed with the secondary combustion air guided forward in the feed direction of the primary air supply pipe and secondary combustion is performed in the secondary air supply pipe, the low combustible fuel remaining in the primary combustion gas is secondary. It is sufficiently mixed with combustion air to ensure stable combustion, and by burning in two stages, the flame temperature during secondary combustion is prevented from becoming high, and the generation of NOx is suppressed. Will be done.

Further , as described above, a plurality of spouts for ejecting low-combustible fuel to the outer peripheral side are provided radially on the outer periphery of the tip of the fuel supply pipe, so that fuel is supplied from the plurality of radially provided spouts. Low-combustible fuel is ejected toward the outer peripheral side of the pipe, and the low -combustible fuel ejected in this way is swirled along the outer periphery of the fuel supply pipe by the primary air supply pipe and is forward in the feed direction of the fuel supply pipe. While being swirled together with the primary combustion air guided to, the fuel is sufficiently mixed and guided to the tip of the fuel supply pipe, so that the primary combustion is stably performed in the primary air supply pipe.

Further, in the low-combustion fuel combustion apparatus according to the present invention, the amount of primary combustion air supplied to the primary air supply pipe and the amount of secondary combustion air supplied to the secondary air supply pipe. The ratio to the amount is preferably in the range of 50:50 to 20:80. By doing so, when the low combustible fuel ejected from the ejection port at the tip of the fuel supply pipe is mixed together with the primary combustion air while being swirled and first combusted in the primary air supply pipe, the low combustibility is achieved. The fuel is not completely burned in the primary air supply pipe, and a part of the low combustible fuel remains. During the primary combustion, the flame temperature is prevented from rising significantly, and the generation of NOx is suppressed. Next, the primary combustion gas remaining after the primary combustion in the primary air supply pipe is guided into the secondary air supply pipe, and the low combustible fuel remaining in the primary combustion gas is the secondary air. Since the secondary combustion is mixed with the secondary combustion air in the supply pipe, the flame temperature is prevented from rising significantly even during the secondary combustion, and the generation of NOx is suppressed.

In the low-combustion fuel combustion device of the present invention, the low-combustible fuel ejected from the ejection port provided in the fuel supply pipe as described above is swirled along the outer periphery of the fuel supply pipe in the primary air supply pipe. It is mixed with the primary combustion air guided forward in the feed direction of the fuel supply pipe while swirling and guided to the tip of the fuel supply pipe so that a part of the low combustion fuel remains in this primary air supply pipe. The primary combustion gas that has been primary-combusted and the low combustible fuel after the primary combustion remains is guided from the primary air supply pipe into the secondary air supply pipe, and along the outer periphery of the primary air supply pipe in the secondary air supply pipe. It was mixed with the secondary combustion air guided forward in the feed direction of the primary air supply pipe while being swirled, and the secondary combustion was performed in this secondary air supply pipe.

As a result, in the low-combustion fuel combustion apparatus of the present invention, by swirling the combustion air, the low-combustible fuel that is difficult to burn can be well agitated and mixed with the combustion air to facilitate combustion. Furthermore, since the low-combustible fuel is divided into the two stages of primary combustion and secondary combustion in which the low-combustible fuel is mixed with combustion air and burned, the low-combustible fuel is not burned at once and the flame temperature does not become high. , NOx is appropriately suppressed, and the low combustible fuel is sufficiently mixed with the primary combustion air and the secondary combustion air to be stably burned.

Claims (5)

A primary air supply pipe that guides the primary combustion air to the front in the feed direction of the fuel supply pipe while swirling along the outer circumference of the fuel supply pipe on the outer peripheral side of the fuel supply pipe provided with the ejection port for ejecting low combustible fuel. The secondary air is guided forward in the feed direction of the primary air supply pipe while swirling along the outer circumference of the primary air supply pipe on the outer peripheral side of the primary air supply pipe on the downstream side in the feed direction. A low-combustible fuel combustion device characterized by having a supply pipe. The low-combustible fuel combustion device according to claim 1, wherein the low-combustible fuel is ammonia. In the low-combustion fuel combustion apparatus according to claim 1 or 2, a spout for ejecting the low-combustion fuel is provided at the tip of the fuel supply pipe, and the low combustibility ejected from the spout is provided. The fuel is mixed with the primary combustion air guided in the feed direction of the fuel supply pipe while being swirled along the outer circumference of the fuel supply pipe in the primary air supply pipe, and a part of the low combustion fuel remains. In this way, the primary combustion is performed in the primary air supply pipe, and the primary combustion gas in which the low combustible fuel remains after the primary combustion is guided from the primary air supply pipe to the above-mentioned secondary air supply pipe, and in the secondary air supply pipe. The low combustible fuel remaining in the primary combustion gas is mixed with the secondary combustion air guided forward in the feed direction of the primary air supply pipe while being swirled along the outer circumference of the primary air supply pipe. A low combustible fuel combustion device characterized by secondary combustion in a supply pipe. In the low-combustion fuel combustion apparatus according to claim 3, a plurality of low-combustion fuels are radially ejected to the outer peripheral side on the outer periphery of the tip of the fuel supply pipe as an ejection port at the tip of the fuel supply pipe. A low-combustion fuel combustion device characterized by having spouts provided radially. In the low-combustion fuel combustion apparatus according to any one of claims 1 to 4, the amount of primary combustion air supplied into the primary air supply pipe and the amount of air supplied to the secondary air supply pipe. A low combustible fuel combustion apparatus characterized in that the ratio to the amount of secondary combustion air produced is in the range of 50:50 to 20:80.

Images