KR20240130531A - Centrifugal continuous combustion device using a nanotechnology-applied SRF incinerator and carbon nanotube heater system device - Google Patents

Abstract

The purpose of the present invention is to minimize the length of a preheating chamber through which combustion air passes when the combustion air enters a combustion chamber to maintain the centrifugal force of the combustion air as much as possible, thereby promoting complete combustion. Provided is a continuous combustion apparatus having a fly ash separation function, which comprises: a combustion unit divided into an inner cylinder and an outer cylinder, wherein combustion air supplied from a blowing fan is introduced into a space between the inner cylinder and the outer cylinder, and the introduced combustion air is rotated and lowered along an inner wall of the inner cylinder by centrifugal force so that the combustion air is supplied to a combustion chamber; a grate in which continuously supplied fuel is loaded on the grate to meet the combustion air rotated and lowered and combusted in the combustion chamber of the combustion unit; a combustion ash discharge unit collecting nonflammable combustion ash discharged to the space between the combustion chamber and the grate into an ash discharge container and automatically discharging the nonflammable combustion ash to the outside; and a fly ash separation unit having an air inlet and an ash outlet provided on one side and the other side, so that vortex air introduced through the air inlet is rotated and raised along the inner wall by centrifugal force and includes fly ash generated in the combustion chamber together and is discharged to the outside through the ash outlet.

Description

Centrifugal continuous combustion device using a nanotechnology-applied SRF incinerator and carbon nanotube heater system device

The present invention relates to a centrifugal continuous combustion device that uses a carbon nanotube heater system device to continuously circulate eddy air supplied from a cyclone in an SRF incinerator to completely separate fly ash, thereby enabling the purified high-temperature combustion gas to be used as a heat source.

Combustion is the burning of fuel, and technically it is a chemical reaction in which the combustible components of fuel, carbon and hydrogen, combine with oxygen in the air, releasing a large amount of heat energy into the surroundings.

Combustion devices that use this combustion principle to ignite and combust various types of fuels inside a combustion chamber to generate heat energy are used in various industrial fields today. For example, combustion devices are installed to obtain heat energy in industrial facilities that require industrial hot water, steam, or high-temperature gas, and large-scale combustion devices are installed in power generation facilities such as thermal power plants to obtain heat energy for power generation.

In addition, a new system is being built in facilities that simply incinerate industrial waste to supply and recycle the heat energy generated during incineration to other industrial facilities.

As the demand for combustion devices increases across industries, the need for high-performance combustion devices with high combustion efficiency and low environmental pollution is also increasing. However, the most widely used stocker-type combustion devices are not able to meet these needs.

The Stoker combustion method is a method of high-temperature combustion by blowing combustion air from the bottom of the fuel supplied into the combustion chamber. However, this method has a serious problem in that the combustion efficiency is low because the fuel floats to the top of the combustion device and escapes in an unburned state.

To solve this problem, the combustion chamber height is increased to lengthen the combustion time.

This has become a major cause of increased installation costs.

In addition, since the fuel is not completely combusted, a large amount of environmental pollutants such as carbon monoxide, sulfur compounds (SOx), nitrogen compounds (NOx), and dioxin are generated. Since all air flows inside the combustion chamber from the bottom to the top, these environmental pollutants escape through the top of the combustion device together with the combustion gas used as a heat source. Therefore, a large dust collection facility must be installed at the rear of the combustion device to recover them. The size and installation cost of this dust collection facility were larger than those of the combustion device, making it uneconomical.

In addition, since the entire inside of the combustion chamber becomes hotter than 1000℃, there was a problem that in order to withstand this, expensive refractory materials had to be attached to the inner wall of the combustion chamber or a water cooling device such as a water jacket had to be installed.

The inventor of the present invention attempted to solve these problems by applying Republic of Korea Patent No. 10-1237761 (Centrifugal continuous combustion device with fly ash separation function) to completely combust fuel by utilizing the centrifugal force of combustion air, thereby exhibiting excellent combustion efficiency and generating almost no environmental substances, and can be said to be a very groundbreaking invention. However, improvements were discovered in the process of actually commercializing and using the above-mentioned Patent No. 10-1237761 (hereinafter referred to as “prior patent”).

First, the prior patent has a problem that the centrifugal force of the combustion air is reduced in the process of passing through the preheating chamber because the combustion air supplied from the blower passes through a long preheating chamber before entering the combustion chamber. Of course, even if it passes through the preheating chamber, the centrifugal force exists, but if the section passing through the preheating chamber is minimized, the centrifugal force is maximized, which further promotes mixing with the fuel, so that more improved complete combustion can be expected.

Second, since the connecting elbow of the prior patent that connects to the steam boiler is directly connected to the combustion chamber, there is a problem that fine fly ash generated during combustion flows into the steam boiler through the connecting elbow together with the high-temperature combustion gas. Therefore, a technology is required to separate this fly ash from the combustion gas.

Third, since the prior patent has a structure in which fuel passing through the fuel injection cone is piled directly on the grate, it is difficult to load a large amount of fuel on the grate, and accordingly, the contact area with combustion air is limited, which ultimately acts as a limiting factor in increasing the firepower.

Therefore, a fuel injection cone structure is required that allows the fuel to be gradually piled up from the edge of the grate as it passes through the fuel injection cone, so that the fuel can be loaded in the most ideal semicircular shape.

Fourth, the prior patent has a problem in that a considerable amount of space remains between the stirring bar installed on the fuel injection cone and the stirring bar installed on the inner wall of the inner tube, which reduces the fuel stirring efficiency and leaves cranks and unburned materials inside the combustion chamber.

The present invention is to solve the problems described above,

The purpose is firstly to minimize the length of the preheating chamber through which combustion air passes when entering the combustion chamber, thereby maintaining the centrifugal force of the combustion air as much as possible, thereby achieving complete combustion.

is to promote.

Second, it simply and effectively separates the fly ash that is inevitably generated in the combustion chamber from the high-temperature combustion gas, so that clean combustion gas is supplied to the steam boiler through the connecting elbow.

Third, the discharge height of the fuel discharged from the fuel injection cone is increased so that the fuel can be accumulated more stably on the grate.

Fourth, the ends of the stirring bars installed on the fuel injection cone and the inner wall of the inner cylinder are positioned on the same circumference to prevent crankcases or unburned materials from remaining inside the combustion chamber.

In order to solve the above-described purpose, the present invention,

A combustion section divided into an inner and outer cylinders, into which combustion air supplied from a blower fan flows into the space between the inner and outer cylinders, and the flowed combustion air rotates downward along the inner wall of the inner cylinder by centrifugal force to be supplied to the combustion chamber; a grate rotatably installed at the lower portion of the combustion section, and continuously supplied fuel is loaded thereon to meet with the rotating downward combustion air and be combusted in the combustion chamber of the combustion section; a combustion ash discharge section in which a re-discharge tube is installed at the lower portion of the grate to seal the combustion chamber, and incombustible combustion ash discharged into the space between the combustion chamber and the grate is collected into the re-discharge tube and automatically discharged to the outside; a fly ash separation section arranged at the upper portion of the combustion section so as to be in communication with the combustion chamber, and having an air inlet and a re-discharge tube provided on one side and the other side, and in which the vortex air introduced through the air inlet rotates upward along the inner wall by centrifugal force to include fly ash generated in the combustion chamber and discharged to the outside through the re-discharge tube; The present invention provides a continuous combustion device having a fly ash separation function, including a cyclone connected to an air inlet and a re-outlet to continuously circulate eddy air to a fly ash separation unit and to send fly ash discharged through the re-outlet to a combustion ash discharge unit by falling downwards inside; a fuel injection cone vertically installed at the center of a grate, a transfer screw installed at the bottom of the fuel injection cone to transport fuel, and a fuel metering supply unit having a metering hopper installed on the transfer screw to meter and supply fuel, thereby continuously metering fuel to the grate.

In addition, a boiler connection elbow is installed on the upper part of the fly ash separation section to use high-temperature combustion gas as a heat source, and the fly ash separation section and the boiler connection elbow are connected with an expansion connection pipe to take thermal expansion into account.

In addition, the grate is characterized by having a main frame in the shape of a circular frame that is rotatably installed, a plurality of internal flat plates installed inside the main frame with a downward slope toward the outside so that fuel supplied to the center can move outward, and a plurality of external flat plates installed horizontally on the outside of the main frame so as to support the fuel that has moved.

Meanwhile, the main frame is supported for rotation by a plurality of support rollers, and is characterized by having a circular rack gear installed on the lower part of the main frame and connected to a driving motor.

In addition, the main frame is characterized in that an internal flat plate is mounted on an internal mounting member that is installed radially and slanted downwards around the fuel supply cone, and an external flat plate is mounted on an external mounting member that is installed horizontally to correspond to the internal mounting member on the outside of the main frame.

In addition, the upper part of the fuel injection cone is characterized by having fences installed at regular intervals along the circumference of the fuel injection cone.

Here, an air hole is formed at the end of the fence, an air passage is provided inside the fence that communicates with the air hole, and compressed air is supplied from a compressor to the air passage to cool the fence exposed to high heat.

In addition, the fuel injection cone is characterized in that a pneumatic line for extinguishing the fire is connected to a compressor on one side to allow compressed air to flow into the fuel injection cone.

In addition, a first bar is installed on the top of the fuel injection cone to crush and stir the fuel supplied over the grate, and a second bar is installed on the inner wall of the inner tube so that the length extends to the circumference drawn by the end of the first stirring bar, so that no gap remains between the first bar and the second bar.

In addition, a nozzle is formed at the ends of the first bar and the second bar, an air passage is provided inside the first bar and the second bar to communicate with the nozzle, and compressed air is supplied from a compressor to the air passage to cool the first bar and the second bar exposed to high heat.

In addition, the combustion ash discharge unit is characterized in that a pipe for forming a negative pressure is connected from the re-discharge tube to the cyclone to ensure that non-combustible combustion ash is smoothly discharged from the combustion chamber.

According to the present invention, the length of the section through which combustion air passes before entering the combustion chamber is minimized, so that the actual centrifugal force of the combustion air upon entering the combustion chamber is maximized, thereby promoting complete combustion.

In addition, since the fly ash that is inevitably generated in the combustion chamber during combustion is completely separated from the combustion gas through the fly ash separation unit, the purified combustion gas can be used as a heat source.

In addition, since the fuel discharged from the fuel injection cone by the fence according to the present invention is loaded on the grate with a larger surface area, thereby increasing the contact area with the combustion air, complete combustion is promoted and, in particular, there is an advantage of increasing the firepower.

In addition, the fuel mixing efficiency is increased by the first and second bars installed so that their ends are positioned on the same circumference inside the lower part of the combustion chamber, and complete combustion is further promoted by preventing crankcases or unburned materials from remaining.

Figure 1 is a drawing showing the configuration of the SRF incinerator and carbon nanotube heater system device.

A preferred embodiment of the present invention is described in detail with reference to the attached drawings.

Figure 1 is a drawing showing the configuration of an SRF incinerator and a carbon nanotube heater system device according to the present invention.

A continuous combustion device having a fly ash separation function according to the present invention is largely composed of a combustion section, a grate, a combustion ash discharge section, a fly ash separation section, a cyclone, and a fuel quantitative supply section.

The combustion section is configured to completely combust the fuel by utilizing the centrifugal force of the combustion air to ensure excellent mixing with the fuel. The combustion section is divided into an inner cylinder and an outer cylinder.

Here, the inner tube is a configuration that actually forms a combustion chamber where combustion air and fuel meet inside and combustion occurs, and the outer tube is a configuration that is installed outside the inner tube so that a predetermined space is formed between the inner tube and the outer tube.

An air inlet is formed on one side of the space formed between the inner and outer tubes (hereinafter, the term "main path" is used interchangeably). The air inlet is connected to a blower fan installed outside the combustion section, so that combustion air supplied from the blower fan flows into the main path of the combustion section through the air inlet.

When combustion air flows into the main passage, the direction of combustion air flow is consistent with the tangential direction of the outer wall of the inner tube, so the combustion air moves with centrifugal force inside the main passage and enters the inner tube with the centrifugal force preserved.

When the combustion air enters the inner tube, i.e. the combustion chamber, the main passage is formed in a very short section upwards and then passes through the inner tube to form downwards so that the centrifugal force of the combustion air is not reduced and is maintained as much as possible.

Therefore, since the combustion air that enters through the air inlet rotates along the circumference on the outer wall of the inner cylinder and rises upward only for a short period, centrifugal force loss is minimized, and in this state, the direction of movement changes and rotates downward along the inner wall of the inner cylinder again to mix with the fuel at the bottom of the combustion chamber.

This combustion section structure preserves the centrifugal force of combustion air as much as possible compared to prior patents, so the vortex of combustion air rotating and descending along the inside of the inner tube is strengthened, thereby promoting complete combustion.

The combustion air supplied to the main path moves along the main path, cools the inner and outer cylinders for the first time, and then is supplied to the internal space of the combustion chamber. At this time, the combustion air creates a strong descending airflow along the inner wall of the inner cylinder due to centrifugal force.

The air curtain effect caused by this strong downdraft prevents the high temperature combustion heat generated inside the combustion chamber from being directly transferred to the inner tube, making it a very effective cooling method.

The strong downward airflow that occurs inside the combustion chamber is a technological configuration that is distinct from the existing stoker method where only an upward airflow exists inside the combustion chamber, and it not only has a cooling effect, but also enables complete combustion of the fuel and smooth discharge of non-combustible combustion materials.

In addition, a number of blades are installed on the upper part of the main channel to promote the rotation of combustion air. These blades continuously maintain the rotational force of the combustion air rotating along the main channel, thereby preventing the rotational speed of the combustion air at the upper part of the main channel from decreasing.

Meanwhile, the grate is installed so as to be rotatable at the bottom of the combustion chamber of the combustion section, and continuously supplied fuel is loaded on top of it to meet the rotating, descending combustion air and continuously combust inside the combustion chamber.

Here, the grate continuously receives fuel from the outside, loads the fuel on top of it, and rotates and agitates it so that the fuel can come into uniform contact with the combustion air and be ignited.

The combustion device of the present invention mainly uses RDF (Refused Derived Fuel) that is fueled by household waste or RPF (Refused Derived Fuel) that is fueled by waste plastic, but any combustible material such as coal, wood, or industrial waste can be used. In addition, although mainly solid combustible materials are used, the shape of the grate described below can be evenly distributed.

By changing within the scope, flammable substances in liquid form such as kerosene and bunker C oil can also be used.

The grate is largely composed of a main frame in the shape of a circular frame, a plurality of inner and outer mounting brackets that are installed radially on the inner and outer sides of the main frame to form a skeleton, and a plurality of inner and outer flat plates that are installed flat on the inner and outer mounting brackets to enable fuel to be loaded.

The main frame is equipped with a circular rack gear along the lower part of the circular frame, and this rack gear is connected to a driving motor so that the main frame can rotate at the lower part of the combustion chamber.

In addition, the main frame is configured to rotate smoothly by being supported by support rollers installed at regular intervals on the bottom of the circular mold. The drive motor and the support rollers are similar in shape, but only one drive motor is sufficient to rotate the main frame, and the rest are supported by support rollers at the bottom of the main frame.

The internal mounting bracket is installed in a radial shape with a downward slope toward the outside, leaving a space inside the main frame for mounting the fuel injection cone, which will be described later, and a mounting protrusion is formed on the top to fit into the internal flat plate.

The external mounting bracket is installed horizontally on the outside of the main frame to correspond to the internal mounting bracket, and a mounting projection is formed on the top to fit in with the external flat plate.

A plurality of inner plates are fitted into the mounting projections of the inner mounting bracket and installed with a downward slope toward the outside, allowing the fuel supplied to the center to move to the outside.

A plurality of outer plates are installed horizontally by being fitted into the mounting protrusions of the outer mounting bracket, so as to support the fuel moving from the center. At this time, it is desirable to install the inner and outer plates with a margin of space to account for thermal expansion due to high temperature.

In addition, the combustion ash discharge unit is configured to smoothly discharge non-combustible combustion ash remaining after complete combustion to the outside of the combustion chamber. According to the combustion device of the present invention, since the fuel is almost completely combusted, almost no combustion ash or environmental pollutants are generated.

However, the fuel may contain non-combustible components that do not burn even at high temperatures, and these remain as combustion ash after the fuel is completely combusted. Therefore, in order to continuously operate the combustion device, it is desirable for these non-combustible combustion ash to be automatically discharged outside the combustion chamber.

The combustion ash discharge unit is configured to automatically discharge non-combustible combustion ash to the outside of the combustion chamber by utilizing the descending airflow that flows along the inner wall of the combustion chamber. That is, an ash discharge container is provided at the bottom of the grate, and the ash discharge container forms a space between the inner tube and the grate so that non-combustible combustion ash is automatically discharged to the ash discharge container along the descending airflow that flows along the inner wall of the combustion chamber.

At this time, a negative pressure forming pipe is connected from the ash discharge tube to the intake port of the cyclone described later so that the non-combustible combustion ash can be smoothly discharged from the combustion chamber.

The pressure-generating pipes are connected from three places in the ash discharge tank to the cyclone. Since the intake port of the cyclone is the part that sucks in air, connecting the ash discharge tank to it creates a pressure inside.

This negative pressure draws air through the space between the combustion chamber inner tube and the grate, allowing the non-combustible combustion ash to be smoothly discharged into the ash discharge chamber.

An ash discharge port is formed at the bottom of the ash discharge tank to completely discharge non-combustible combustion ash discharged into the ash discharge tank outside the combustion device.

Inside the ash discharge bin, an ash transport plate is installed at the bottom of the grate and rotates together with the grate to scrape up non-combustible combustion ash accumulated at the bottom of the ash discharge bin and transport it to the ash discharge port.

A conveying screw is installed in the ash discharge port to automatically discharge non-combustible combustion ash outside the combustion device. This conveying screw can be directly connected to the ash discharge port, but can also be indirectly connected via the discharge screw.

A discharge motor is installed in the discharge screw to generate discharge power for non-combustible combustible materials, and a rotary valve is installed at the connection between the discharge screw and the transport screw to reduce the high pressure inside the discharge screw.

In addition, a dust recovery pipe is installed in the conveying screw to recover dust and circulate it to the ash discharge tank. The inside of the conveying screw contains not only non-combustible combustion ash but also fine dust. In the present invention, the dust is sucked in through the dust recovery pipe and blown into the ash discharge tank, thereby circulating the dust and preventing it from being discharged outside the combustion tank.

For this purpose, a blower motor and a pressure regulating valve for controlling the blowing pressure of the blower motor are each installed in the dust collection pipe.

Meanwhile, the fly ash separation unit is positioned above the combustion unit so as to be connected to the combustion chamber of the combustion unit, and is configured to separate the fly ash generated in the combustion chamber from the high-temperature combustion gas to be used as a heat source, thereby allowing only the purified combustion gas to be supplied to the steam boiler through the connecting elbow.

The fly ash separation section is also composed of a separation inner tube and a separation outer tube, and an air inlet and an ash discharge port are provided on one side and the other side of the space between the separation inner tube and the separation outer tube, respectively.

The air inlet may be connected to a separate blower to receive vortex air, but more preferably, it is connected to the exhaust port of the cyclone so that air supplied from the cyclone is introduced. The air introduced into the air inlet also has rotational force as vortex air, and descends along the outer wall of the separation inner tube of the fly ash separation section for a predetermined distance and then rotates and rises along the inner wall of the separation inner tube.

When the vortex air rotates and rises along the inner wall of the separator due to centrifugal force, fly ash generated during the combustion process in the combustion chamber is included in the vortex air and rotates and rises together.

In this way, the eddy air including fly ash rotates and rises, then moves toward the outer separation tube through the upper part of the inner separation tube of the fly ash separation section, and is finally discharged to the outside through the ash discharge port formed between the inner separation tube and the outer separation tube.

At this time, the ash discharge port may be connected to a separate collecting means so that fly ash can be collected, but in the case of using a cyclone as in a preferred embodiment of the present invention, the intake port and the ash discharge port of the cyclone are connected by a pipe so that the vortex air containing fly ash enters the cyclone.

Fly ash, which has a higher specific gravity than air, falls downwards inside the cyclone, and the swirling air is sent back toward the air inlet through the cyclone's intake.

In this way, fly ash generated in the combustion chamber is separated by the vortex air continuously circulated by the cyclone and accumulates at the bottom of the cyclone instead of flowing into the steam boiler.

In addition, a connecting elbow is installed at the upper part of the fly ash separation section to connect to a steam boiler in order to use high-temperature combustion gas as a heat source, and it is preferable that the fly ash separation section and the connecting elbow are connected by an expansion connecting pipe in consideration of thermal expansion.

Since the connecting elbow does not have a downward flow of combustion air, it is desirable to attach a refractory material to its inner wall to protect it from the high temperature of combustion heat. It is designed in a double layer form with castable and cerak wool attached.

The flexible connecting tube is made of stainless steel in the form of a Javara and is non-toxic.

Compensates for thermal expansion and contraction between the re-separating section and the connecting elbow.

Meanwhile, the lower part of the cyclone is connected to the combustion ash discharge unit in order to discharge the fly ash accumulated at the bottom of the cyclone to the outside. Therefore, the fly ash accumulated at the bottom of the cyclone is sent to the combustion ash discharge unit and discharged to the outside together with the non-combustible combustion ash.

In addition, a pipe for forming a negative pressure is connected to the ash discharge tube at the intake port of the cyclone so that non-combustible combustion ash can be smoothly discharged from the combustion chamber. By utilizing the negative pressure formed at the intake port of the cyclone, fly ash is separated, and at the same time, non-combustible combustion ash at the bottom of the combustion chamber is smoothly discharged to the ash discharge tube.

Meanwhile, a fuel metering supply unit is provided to continuously and quantitatively supply fuel to the grate. The fuel metering supply unit is largely composed of a fuel injection cone installed vertically in the center of the grate, a transfer screw installed at the bottom of the fuel injection cone to transport fuel, and a metering hopper installed on the transfer screw to steadily supply fuel.

The fuel injection cone is fixedly installed in the center of the grate and supplies the fuel transported by the transfer screw evenly onto the grate. The fuel injection cone is fixed and the grate rotates around it, so that the fuel is stirred at the point where the fuel injection cone and the grate meet, allowing it to be ignited evenly with the combustion air.

At this time, in order for the fuel injected through the fuel injection cone to be stably piled up on the grate with a larger surface area, a fence having a predetermined height is installed at a predetermined interval along the circumference of the fuel injection cone on the upper part of the fuel injection cone.

Since the fence is installed at a predetermined height along the circumference of the upper portion of the fuel injection cone, the fuel discharged through the fuel injection cone rises upward by the height of the fence and then accumulates on the grate.

Accordingly, the fuel can be evenly spread across the entire grate, increasing the surface area of the fuel and thus the contact area with the combustion air, thus promoting complete combustion and increasing the firepower.

Here, since the fence is located inside the combustion chamber and is exposed to high-temperature combustion gas, it is desirable to provide a separate means for cooling the fence.

Accordingly, an air hole is formed at the end of the fence for injecting compressed air, and an air passage communicating with the air hole is provided inside the fence.

The air path is connected to a separately installed compressor and pneumatic line to receive compressed air, so even if the fence is exposed to high heat, sufficient cooling is possible through the spraying of compressed air.

Meanwhile, when combustion is finished in the combustion chamber, the final burning fuel must be completely removed from the fuel injection cone so that combustion ash or crankcase does not stick to the fuel injection cone, allowing fuel to be reinjected through the fuel injection cone later.

Accordingly, a fire extinguishing pneumatic line connected to a compressor is connected to one side of the fuel injection cone to allow compressed air to flow into the fuel injection cone. When compressed air flows into the fuel injection cone, the compressed air is discharged toward the combustion chamber through a gap formed in the upper part of the fuel injection cone to remove fuel residues or combustion ash remaining in the upper part of the fuel injection cone, thereby preventing high-temperature combustion ash from sticking to the upper part of the fuel injection cone.

In this way, when combustion is finished, the upper part of the fuel injection cone is cleaned by compressed air, so that when fuel is later re-injected through the fuel injection cone, the fuel supply becomes smooth.

In addition, if a separate conveying device such as a screw is installed inside the fuel injection cone to raise the fuel toward the fuel injection cone, the flame in the combustion chamber may travel down the empty space created when the screw rotates, causing ignition outside the combustion chamber.

This not only reduces combustion efficiency, but can also cause fire in severe cases. Therefore, in order to prevent flames from the combustion chamber from coming down the fuel injection cone, the fuel injection cone is installed vertically without a separate screw installed inside, and is configured so that only fuel is charged.

In this way, since a separate screw is not installed inside the fuel injection cone, a separate technical configuration is required to elevate the fuel. To this end, the rotating blades of the transfer screw are configured so that the transfer force can be applied in opposite directions on both sides centered on the fuel injection cone, more precisely, in the direction of pushing the fuel up from both sides of the lower part of the fuel injection cone toward the fuel injection cone.

The conveying screw can be installed to directly connect the metering hopper and the fuel injection cone, or it can be installed to indirectly connect the metering hopper and the fuel injection cone via the ejection screw, taking into account the height of the metering hopper and the fuel injection cone. At this time, the rotating blades of the ejection screw are made to face opposite directions at the connection portion of the metering screw and the conveying screw to ensure smooth downward movement of the fuel.

The quantitative hopper consists of a body into which fuel transported by a belt conveyor or the like is fed through an open top, and a plurality of rotating discs that are rotatably installed inside the body to uniformly mix the fuel and discharge it downward.

The rotating disc is installed at a certain interval on the rotating shaft installed inside the body of the quantitative hopper, and stirring blades with wing holes formed on the periphery of the rotating disc are installed to uniformly stir the fuel and prevent the fuel bridging phenomenon (fuel entanglement phenomenon).

In addition, a number of rear exhaust holes are formed on the surface of the rotating disc to move the fuel that is pushed forward while the rotating disc rotates to the rear, thereby ensuring that the fuel is stirred smoothly by the rotating disc.

According to the present invention, a configuration is described that allows fuel continuously supplied over a grate to be evenly stirred to cause uniform ignition within a combustion chamber and prevents unburned fuel from being discharged outside the combustion chamber, thereby improving combustion efficiency.

First, a first bar for fuel mixing is installed on the top of the fuel injection cone located in the center of the grate. The first bar crushes and mixes the fuel rotating on the grate by colliding with it.

It also pushes the fuel outwards from the grate, providing space for the fuel to continue to be loaded in the central area and increasing the surface area where it meets the combustion air, allowing sufficient ignition to occur.

Additionally, a second bar for stirring unburned fuel is installed at the bottom of the combustion chamber, more precisely, on the lower inner wall of the inner tube, the length of which extends to the circumference drawn by the end of the first bar.

The second bar crushes unburned fuel pushed down from the grate and pushes it back up into the combustion chamber to cause combustion. Since the second bar is extended to the circumference of the end of the first bar, there is virtually no gap left between the end of the first bar and the end of the second bar, so that fuel mixing is more efficient.

Here, since the first and second bars are also exposed to the high-temperature combustion chamber, cooling is required like the fence described above. Injection holes are formed at the ends of the first and second bars, and air passages communicating with the injection holes are provided inside the first and second bars. Compressed air is supplied from a separately provided compressor to the air passages to cool the first and second bars.

At this time, since the first bar is installed on the upper part of the fuel injection cone, it can share the compressor and air pressure line used for the fence cooling described above. In addition, the cooling of the second bar can be performed by using the compressor in common while connecting a separate air pressure line to the inner tube where the second bar is installed. Since the cooling of the first and second bars can be easily performed by those skilled in the art from the fence cooling of the fuel injection cone described above, a separate drawing is omitted.

Hereinafter, the combustion operation of the combustion device according to the present invention will be briefly described.

The principle of complete combustion in the present invention is that the inside of the combustion chamber is divided into several combustion areas by the centrifugal force of the combustion air, and unburned fuel is combusted while circulating through these combustion areas until it is completely combusted.

The ignition and complete combustion stage comprises: a step of forming a mixed ignition combustion zone in which combustion air rotates and descends along the inner wall of the combustion chamber inner tube and meets and ignites fuel continuously supplied onto the grate; a step of forming a high-specific gravity combustion zone in which unburned fuel with a high specific gravity among the fuel ignited in the mixed ignition combustion zone is moved toward the descending airflow zone by centrifugal force to increase the combustion distance and combustion time and to combust; a step of moving unburned fuel in the high-specific gravity combustion zone to the descending airflow zone by centrifugal force and to recirculate it to the mixed ignition combustion zone; and a low-specific gravity combustion zone in which unburned fuel with a low specific gravity among the fuel ignited in the mixed ignition combustion zone is moved to the center of the combustion chamber and combusted while rotating upward, and a step of forming a high-temperature thermonucleus in the center of the combustion chamber by high-temperature combustion gas created by complete combustion.

That is, the combustion air that has rotated and descended into the combustion chamber is mixed with the fuel loaded on the grate while rotating at high speed in the mixed ignition combustion area, and begins to ignite and combust as it moves to the center of the combustion chamber.

High-density fuel moves to the high-density combustion area formed outside the combustion chamber by centrifugal force during the process of high-speed rotation and rise, maximizing the combustion distance and combustion time and combusting sufficiently. Unburned fuel that is not completely combusted during this process moves to the descending airflow area and is recirculated and completely combusted.

Since low-specific gravity fuel is relatively less affected by centrifugal force, it moves to the low-specific gravity combustion area formed in the center of the combustion chamber and the high-temperature thermonucleus during the process of high-speed rotation and rise, and is completely combusted as the temperature rises. At this time, some unburned fuel that was not thermally decomposed is centrifugally separated by its weight and moves to the high-specific gravity combustion area and the downdraft area in that order, and is completely combusted while being recirculated.

The high-temperature combustion gas completely combusted in this manner is transferred through the connecting elbow and used as a heat source for producing steam, etc. Although the high-temperature combustion gas contains some fly ash generated during combustion as described above, since the fly ash is separated by the fly ash separator according to the present invention, only the cleanly purified heat source is sent to the connecting elbow.

Since this high-temperature combustion gas is completely thermally decomposed in the low-specific-gravity combustion region and high-temperature thermonuclear region, it hardly contains environmental pollutants such as carbon monoxide, sulfur compounds (SOx), nitrogen compounds (NOx), and dioxin, which are harmful to the human body. Therefore, according to the present invention, there is no need to install a large-scale dust collection device like in the past at the rear end of the combustion device.

Looking at the temperature distribution by centrifugal separated combustion area, there is a slight deviation depending on the operating time or type of fuel, but it is usually 100 to 500℃ in the downdraft area, 600 to 1,000℃ in the mixed ignition and combustion area, 800 to 1,300℃ in the high specific gravity combustion area, 1,200 to 1,500℃ in the low specific gravity combustion area, and 1,400 to 1,900℃ in the high temperature thermonuclear area. In addition, the outer tube of the combustion part, which is cooled by the downdraft area, is not exposed to human contact while the combustion device is in operation.

It's cooled enough that you can touch it directly.

In this way, according to the present invention, the inside of the combustion chamber is completely centrifugally separated by the combustion air descending while rotating at high speed, so that the outside of the combustion chamber is sufficiently cooled to the extent that a separate cooling device is not necessary, while the center of the combustion chamber rises to a high temperature of 1,200℃ or higher, enabling complete combustion of the fuel.

Above, the present invention has been described in detail using preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described, and those skilled in the art may substitute or modify any number of components within the scope of the present invention, which also falls within the rights of the present invention.

See drawing 1

Claims (1)

A combustion section divided into an inner and outer cylinder, into which combustion air supplied from a blower fan flows into the space between the inner and outer cylinders, and the supplied combustion air is supplied to the combustion chamber by rotating and descending along the inner wall of the inner cylinder by centrifugal force; a grate rotatably installed at the lower portion of the combustion section, and which allows continuously supplied fuel to be loaded on top and combusted in the combustion chamber of the combustion section by meeting with the rotating and descending combustion air;
A continuous combustion device having a fly ash separation function, characterized by further comprising: a combustion ash discharge unit in which an ash discharge tube is installed at the lower part of the grate to seal the combustion chamber, and non-combustible combustion ash discharged between the combustion chamber and the grate is collected into the ash discharge tube and automatically discharged to the outside; a fly ash separation unit disposed above the combustion unit so as to be in communication with the combustion chamber, and having an air inlet and an ash discharge tube provided on one side and the other side, such that swirling air introduced through the air inlet is rotated upward along the inner wall by centrifugal force and includes fly ash generated in the combustion chamber and discharged to the outside through the ash discharge tube; wherein the device further comprises a cyclone connected to the air inlet and the ash discharge tube so that the swirling air is continuously circulated to the fly ash separation unit, and fly ash discharged through the ash discharge tube falls downward from the inside and is sent to the combustion ash discharge unit.
A continuous combustion device having a fly ash separation function, characterized by further including a fuel metering supply unit having a fuel injection cone installed vertically in the center of a grate, a conveying screw installed below the fuel injection cone for transporting fuel, and a metering hopper installed on the conveying screw for metering and supplying fuel, thereby continuously metering fuel to the grate.
A continuous combustion device having a fly ash separation function, characterized in that a connecting elbow is installed on the upper part of a fly ash separation section to use high-temperature combustion gas as a heat source, and the fly ash separation section and the connecting elbow are connected using an expansion connecting pipe in consideration of thermal expansion.
A continuous combustion device having a fly ash separation function, characterized in that a main frame in the shape of a circular frame is rotatably installed, a plurality of inner plates are installed inside the main frame with a downward slope outward so that fuel supplied to the center can move outward, and a plurality of outer plates are installed horizontally on the outside of the main frame so as to support the fuel that has moved.
A continuous combustion device having a fly ash separation function, characterized in that the main frame is rotatably supported by a plurality of support rollers and a circular rack gear connected to a driving motor is installed at the bottom of the main frame.
A continuous combustion device having a fly ash separation function, characterized in that the inner plate is mounted on an inner mounting member installed in a radial shape centered on a fuel injection cone and inclined downwards inside the main frame, and the outer plate is mounted on an outer mounting member installed horizontally to correspond to the inner mounting member outside the main frame.
A continuous combustion device having a fly ash separation function, characterized in that fences are installed at regular intervals along the circumference of the fuel injection cone on the upper part of the fuel injection cone.
A continuous combustion device having a fly ash separation function, characterized in that an air hole is formed at the end of the fence, an air passage is provided inside the fence communicating with the air hole, and compressed air is supplied from a compressor to the air passage to cool the fence exposed to high heat.
A continuous combustion device having a fly ash separation function, characterized in that a fire extinguishing pneumatic line connected to a compressor is connected to one side of the fuel injection cone to allow compressed air to flow into the inside of the fuel injection cone.
A continuous combustion device having a fly ash separation function, characterized in that a first bar is installed on the top of a fuel injection cone to crush and stir fuel supplied over a grate, and a second bar is installed on the inner wall of an inner tube so that the length extends to the circumference drawn by the end of the first bar, so that no gap remains between the first bar and the second bar.
A continuous combustion device having a fly ash separation function, characterized in that a negative pressure forming pipe is connected from the ash discharge tank to the cyclone so that non-combustible combustion ash is smoothly discharged from the combustion chamber.