KR102186562B1 - Biomass burning system for low emission and high efficiency - Google Patents

Abstract

It relates to a high-efficiency, low-pollution biomass combustion system that prevents the generation of clinker due to combustion of biomass and prevents fouling by fly ash in a boiler, comprising: a combustion furnace having a combustion chamber, the combustion chamber A fuel supply unit for supplying biomass as fuel to the combustion chamber, a fire grate for supporting the fuel supplied to the combustion chamber, a first air supply unit for supplying exhaust gas and air recirculated to the bottom of the grate in the combustion chamber, and in the combustion chamber A configuration including a second air supply unit supplying air from the top of the grate to the flame portion of the fuel, and a flame discharge unit supplying heat energy to the boiler from the upper part of the combustion chamber and blocking fly ash flowing into the boiler is provided, and nitrogen Combustion efficiency can be maximized by preventing the generation of oxides (NOx) and clinker, minimizing fouling, and keeping the operating air ratio low.

Description

Biomass burning system for low emission and high efficiency}

The present invention relates to a high-efficiency, low-pollution biomass combustion system capable of burning woody biomass with high efficiency and low pollution, and additionally prevents the generation of clinker due to combustion of biomass, and fouls by fly ash in a boiler. It relates to a high-efficiency, low-pollution biomass combustion system that prevents fouling.

Recently, as the problem of climate change caused by global warming has emerged as a serious threat to human survival, interest in renewable energy is increasing, and investment to replace existing fossil fuels is increasing rapidly. In this reality, biomass is attracting attention as a field of alternative energy that can resolve concerns about fossil fuel depletion and environmental pollution.

Biomass is a term that refers to a biological organism including plants, microbes, and animals that live on them, which are produced by photosynthesis of plants and microorganisms by solar energy. Therefore, biomass resources include starchy resources such as grains, forest trees such as wood chips and waste wood, and cellulose resources including agricultural products such as rice straw and rice husk, sugar based resources such as sugar cane and sugar beets, and food waste. It has a comprehensive meaning including organic waste.

Currently, about 1.8 to 2 trillion tons of biomass by dry weight exist on the earth, and 200 billion tons of biomass, which is about 10% of this amount, is produced every year, which is about 0.1 of the solar energy hitting the earth. percent, and that what is being accumulated in the biomass, and the biomass is basically can not not be an attractive source of energy than fossil fuels because the environmental impact caused by CO _2.

The method of converting biomass into energy can be divided into a thermochemical method and a biological method. Among them, the oldest energy conversion technology among thermochemical methods is incineration. In the energy recovery process of biomass through incineration, the process composition and design conditions of unit facilities are determined according to the characteristics of the incoming goods and the emission concentration of air pollutants in the rear stage.In general, the incineration method is based on the type of incinerator and fire grate. ) And fluidized bed incineration devices. The grate incineration device is classified into a fixed grate and a mobile grate according to the shape of the grate.

Meanwhile, representative air pollutants generated in the combustion process include carbon monoxide (CO), nitrogen oxides (NOx), and sulfur oxides (SOx). Among these pollutants, sulfur oxides are currently technically inevitable to rely on post-treatment, but carbon monoxide and nitrogen oxides can be technically minimized in the combustion process. Among them, nitrogen oxide is the pollutant that costs the most for post-treatment. Most of the ways to reduce nitrogen oxide emissions rely on post-treatment to reduce the generated nitrogen oxides, and thus, enormous costs are spent on installing and maintaining post-treatment facilities.

An example of such a technique is disclosed in Documents 1 to 3 below.

For example, in Patent Document 1 below, a main combustion chamber having an air injection hole penetrating from the outside to the inside, and a main combustion chamber in which a material is burned, and a main combustion burner that is disposed in the main combustion chamber to supply energy to burn the material , A housing disposed outside the main combustion chamber through which the high-temperature combustion gas burned in the main combustion chamber flows, and an air jacket layer formed to surround the housing into which external air is introduced, wherein the housing is outside the housing. It is installed in the housing so as to penetrate from the inside of the air jacket layer, and has an air injection nozzle for supplying the external air to the air injection hole, and the air injection hole is supplied from the air injection nozzle. Disclosed is a combustion apparatus for producing a mixed gas by mixing a combustion gas flowing in the housing attracted to the inside by the external air with the external air, and supplying the mixed gas into the main combustion chamber.

In addition, in Patent Document 2 below, a hollow combustion furnace, a combustor for supplying main combustion fuel into the combustion furnace to generate a flame, and at least one disposed on the outer circumferential surface of the combustion furnace, as re-burning fuel inside the combustion furnace A reburning fuel supply module for injecting biomass, an oxidizing agent supply module for supplying an oxidizing agent for a reburning process in the combustion furnace, and an oxidizing agent supply unit supplying the oxidizing agent to the reburned fuel supply module and the oxidizing agent supply module And a mixture of the reburned fuel and the oxidizing agent is supplied into the combustion furnace to form a fuel-rich region, and the oxidizing agent through the oxidizing agent supply module is supplied to the downstream of the fuel-rich region. Thus, the oxidizing agent supplied to the reburnt fuel supply module is disclosed for a biomass reburning system that performs a function of transferring the reburned fuel.

On the other hand, in the following Patent Document 3, as an exhaust reburning combined cycle power plant with high efficiency and reducing the generation amount of nitrogen oxides as much as possible, in an exhaust reburning combined cycle power plant that recovers heat by putting gas turbine exhaust gas into a boiler using pulverized coal as a fuel, [0003] Disclosed is an exhaust reburning combined cycle power plant in which gas turbine exhaust gas is supplied as a swirling flow around pulverized coal injected into the boiler while being transferred by air and introduced into a boiler.

Korean Registered Patent Publication No. 10-1133434 (registered on March 29, 2012) Korean Registered Patent Publication No. 10-0959309 (registered on May 14, 2010) Japanese Unexamined Patent Publication No. 1993-264040 (published on October 12, 1993)

In the technology disclosed in the patent document as described above, in the case of a solid biomass boiler, the combustion efficiency is low due to the characteristics of the solid fuel, and due to this characteristic, CO (carbon monoxide) due to incomplete combustion increases rapidly, and the flame temperature in the grate There was a problem that not only clinker was generated due to the local increase, but also the generation of NOx was significantly higher than that of other fuels.

In addition, there is a problem that the fly ash generated in the combustion chamber is scattered and fouling occurs in the boiler, thereby increasing the burden on the boiler post-treatment facility.

An object of the present invention has been made to solve the above-described problems, and provides a high-efficiency, low-pollution biomass combustion system capable of maximizing the operating efficiency of the system by minimizing scattering of fly ash entering the boiler and improving combustion efficiency. To provide.

Another object of the present invention is to provide a high-efficiency, low-pollution biomass combustion system capable of reducing the generation of pollutants by reducing nitrogen oxides (NOx).

In order to achieve the above object, the high-efficiency and low-polluting biomass combustion system according to the present invention is a high-efficiency and low-polluting biomass combustion system, a combustion furnace having a combustion chamber, a fuel supply unit for supplying biomass to the combustion chamber as fuel, the combustion chamber A fire grate for supporting the fuel supplied to the fuel, a first air supply unit for supplying exhaust gas and air recirculated to the lower portion of the grate in the combustion chamber, and supplying air from the upper portion of the combustion chamber to the lower end of the flame of the fuel And a second air supply unit, and a flame discharge unit supplying heat energy to the boiler from the upper part of the combustion chamber and blocking fly ash flowing into the boiler.

In addition, in the biomass combustion system according to the present invention, a third air supply unit is provided in the flame discharge unit to prevent fouling in the boiler due to scattering of fly ash in the combustion chamber.

In addition, in the biomass combustion system according to the present invention, the first air supply unit is generated during biomass combustion by suppressing an increase in the overall flame temperature and the temperature of the flame formed on the surface of the grate by mixing primary combustion air and recirculating exhaust gas. It is characterized in that the clinker is prevented, and the second air supply unit injects high-temperature air at high speed.

In addition, in the biomass combustion system according to the present invention, the second air supply unit includes a plurality of first air supply ports installed in the refractory material of the combustion chamber with supply pipes forming an air flow path so that secondary air can be heated through radiant heat of the flame. It includes a plurality of second air supply ports, the first air supply port is provided in the upper portion of the combustion chamber, the second air supply port is characterized in that provided in the side of the combustion chamber.

In addition, in the biomass combustion system according to the present invention, the third air supply unit is provided over the entire circular circumference of the flame discharge unit, and the flame discharge unit through a plurality of tangential through holes toward the boiler combustion chamber and the tangential through hole. It is characterized in that it induces the swirling flow of the flame by including an air box for holding the air to be supplied to the inside.

In addition, in the biomass combustion system according to the present invention, the grate is provided inclined toward the flame discharge part in the combustion furnace, a plurality of air supply ports are provided in the first air supply part, and the diameters of the plurality of air supply ports are It is characterized in that it is formed differently.

In addition, in the biomass combustion system according to the present invention, the grate is provided to be inclined toward the flame discharge unit in the combustion furnace, and each of the plurality of first air supply ports and the plurality of second air supply ports is angled from the top of the grate. It is provided at a height corresponding to the photo grate and is characterized in that high-temperature air is injected and supplied to the lower end of the flame at high speed.

Further, in the biomass combustion system according to the present invention, some of the plurality of second air supply ports are provided above the fuel supply unit, and some of the plurality of second air supply ports are provided below the flame discharge unit. To do.

In addition, in the biomass combustion system according to the present invention, the injection speed of the air injected from the first air supply unit and the second air supply unit is different.

As described above, according to the high-efficiency, low-pollution biomass combustion system according to the present invention, the generation of clinker is prevented by the first air supply unit that supplies exhaust gas and air recirculated to the lower part of the grate in the combustion chamber, while nitrogen oxide (NOx ) The effect of suppressing the production is obtained.

In addition, according to the high-efficiency, low-pollution biomass combustion system according to the present invention, it is possible to minimize fly ash flowing into the boiler by supplying heat energy to the boiler from the top of the combustion chamber and providing a flame discharge unit that blocks fly ash flowing into the boiler. The effect of being able to do is also obtained.

In addition, according to the high-efficiency, low-polluting biomass combustion system according to the present invention, air preheated by radiant heat in the furnace from the second air supply unit is injected at high speed into the interior of the lower part of the flame to maximize the oxidation reaction of the solid biomass used as fuel. In the condition of low operating air-fuel ratio (exhaust gas O ₂ concentration), the generation of CO is suppressed to improve combustion efficiency, thereby improving the efficiency of the entire boiler system.

In addition, according to the high-efficiency, low-pollution biomass combustion system according to the present invention, it is possible to reduce the generation of pollutants by suppressing an increase in the overall flame temperature and reducing nitrogen oxides (NOx).

1 is a block diagram of a high-efficiency, low-pollution biomass combustion system according to an embodiment of the present invention,
2 is a process piping diagram of a high-efficiency, low-pollution biomass combustion system according to the present invention,
3 is a view for explaining a state of supplying air in the combustion furnace and the flame discharge unit shown in FIG. 1;
4 is a cross-sectional view showing the structure of a third air supply unit in the flame discharge unit shown in FIG. 2;
5 is a graph showing a comparison state of the CO concentration according to the air ratio in the present invention and the prior art;
6 is a graph showing a comparison state of the NOx concentration according to the air ratio in the present invention and the prior art.

The above and other objects and new features of the present invention will become more apparent from the description of the present specification and the accompanying drawings.

The term "Biomass" as applied to the present invention means any one of waste plant shells, waste wood or sawdust, but is not limited thereto, and includes agricultural products such as rice straw and rice hull. Resources, sugar-based resources such as sugar cane, sugar beets, and organic wastes such as food waste. In addition, the term "fuel" used in the present invention refers to the above-described biomass as fuel to be stored in the fuel supply and burned in the combustion chamber.

The present invention is a biomass combustion system capable of combusting biomass with high efficiency and low pollution.Since recirculated exhaust gas is mixed with primary air and supplied into the combustion furnace, the generation of NOx and clinker is prevented, and high-temperature air installed in the wall surface Maximizes combustion efficiency by injecting (secondary air) into the flame, and minimizes fly ash that flows into the boiler by supplying air (tertiary air) by turning the outlet of the combustion furnace to the boiler. Build the skills you can do.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

1 is a block diagram of a high-efficiency, low-polluting biomass combustion system according to the present invention, FIG. 2 is a process piping diagram of a high-efficiency, low-polluting biomass combustion system according to the present invention, and FIG. 3 is a combustion furnace and flame shown in FIG. It is a drawing for explaining the state of supply of air from the discharge part.

The high-efficiency, low-polluting biomass combustion system according to the present invention is a high-efficiency and low-polluting biomass combustion system, as shown in FIGS. 1 and 2, a combustion furnace 100 having a combustion chamber 110, and the combustion chamber 110. ), a fuel supply unit 200 for supplying biomass as fuel, a fire grate 300 for supporting the fuel supplied to the combustion chamber 110, exhaust gas recirculated to the lower part of the grate in the combustion chamber 110, and A first air supply unit 400 supplying air, a second air supply unit 500 supplying air from an upper portion of the combustion chamber 110 to the flame portion of the fuel, and a boiler 600 from the upper portion of the combustion chamber 110 It supplies thermal energy and includes a flame discharge unit 700 for blocking fly ash flowing into the boiler 600.

As shown in FIG. 2, the combustion furnace 100 has a combustion chamber 110 surrounded by a refractory material and a refractory brick and is made of a rectangular shape as shown in FIG. 2, and the front end is in communication with the fuel supply unit 200, and the rear end is A grate 300 is provided in communication with the flame discharge unit 700 and in which the fuel to be burned is supported in the combustion chamber 110. In addition, a plurality of through holes for transferring air supplied from the first air supply unit 400 and the second air supply unit 500 to the combustion chamber 110 may be provided in the upper, lower, and side surfaces of the combustion furnace 100. . In addition, an outlet 120 for discharging the biomass burned in the combustion chamber 110 is provided at a lower side of the combustion furnace 100.

As shown in Figure 2, the fuel supply unit 200 is a hopper for storing and storing biomass, which is a mixture of waste plant skins, waste wood, or sawdust, and stored in the hopper as shown in FIG. And a transfer member including a screw for automatically supplying biomass to the combustion chamber and a fuel supply motor for operating the screw. The biomass stored in the hopper is in the form of pellets and chips, such as cellulose-based resources including agricultural products such as rice straw and rice husk, sugar-based resources such as sugar cane and sugar beets, and food waste. It may be organic waste.

As shown in FIG. 1, the grate 300 is mounted in the combustion chamber 110 so as to be inclined toward the flame discharge unit 700 in the combustion furnace 100. The grate 300 is provided to maintain a certain angle of inclination. As shown in FIG. 1, an outlet 120 for discharging the burnt biomass is positioned under the grate 300.

The first air supply unit 400 is a grate 300 to supply exhaust gas and air (primary air) recirculated to the lower portion of the grate 300 in the combustion chamber 110, as shown in FIGS. 1 and 2 It includes a plurality of air supply ports 410 provided in the lower portion of and a fan 420 for primary air supplying air while circulating exhaust gas discharged from the boiler 600.

The air supply port 410 includes a pipeline provided between the combustion chamber 110 and the flue 610 for discharging exhaust gas from the boiler 600 to the outside, and through a plurality of through holes provided in the combustion chamber 110 It is provided to extend to the interior of the combustion chamber (110). In addition, the air supply port 410 according to the present invention may have different diameters of a plurality of air supply ports in the combustion chamber 110 corresponding to the grate 300 mounted inclinedly. For example, in order to supply uniform exhaust gas and air to the lower portion of the grate 300 as shown in FIG. 1, exhaust gas and air are discharged to the tip of the grate 300 at high pressure, and the grate 300 A configuration for discharging exhaust gas and air at low pressure can be provided at the rear end of ).

The above-described first air supply unit 400 supplies primary air including recirculated exhaust gas to prevent clinker of combusted biomass, and the grate 300 is the first air supply unit 400 The temperature of the lower part of the grate 300 is controlled by the primary air including the recycled exhaust gas supplied from. Accordingly, it is possible to prevent the ash component of the fuel from being melted on the surface of the grate 300 and then solidifying (Clinkering) in the process of burning the fuel, which is biomass, in the grate 300. Further, as the recycled exhaust gas is supplied to the combustion chamber 110 together with the primary air, generation of nitrogen oxides (NOx) due to suppression of an increase in flame temperature may be suppressed.

As shown in FIGS. 1 and 2, the second air supply unit 500 injects high-temperature air (secondary air) into the top of the biomass burned in the grate 300 in the combustion chamber 110 at high speed. Prepared for To this end, the second air supply unit 500 includes a plurality of first air supply ports 510 and a plurality of second air supply ports 520 supplying air from an upper portion of the combustion chamber 110 to a flame of biomass fuel. And a fan 530 for secondary air supplying hot air.

In the present invention, a supply pipe forming an air flow path so that secondary air can be heated through radiant heat of a flame is provided in the combustion chamber refractory by providing a second air supply unit 500 installed in the refractory material of the combustion chamber. Since high-temperature air is supplied to the furnace, it is possible to promote radiant heat transfer and improve combustion efficiency.

1 and 3, the first air supply port 510 is provided above the combustion chamber 110 through a plurality of through holes provided in the combustion chamber 110, and the second air supply port ( The 520 is provided along the slope of the grate on the side of the combustion chamber 110 through a plurality of through holes provided in the combustion chamber 110.

That is, as can be seen in FIGS. 1 and 3, at just above the grate 300 according to the inclined grate 300, the second air supply unit 500 is provided on the upper portion of the fuel supply unit 200. A second air supply port, one first air supply port provided below the injection position of the one second air supply port, another second air supply port provided below the injection position of the one air supply part, the The other first air supply ports are sequentially provided below the injection position of the other second air supply port and provided under the flame discharge unit 700 to uniformly distribute the flame in the inclined grate 300 Secondary air can be injected and supplied.

As described above, the secondary air supplied from the plurality of first air supply ports 510 and the plurality of second air supply ports 520 speeds up the flow rate so that the high-temperature secondary injection air penetrates into the flame. Thus, the oxidation reaction can be accelerated, CO reduction and combustion efficiency can be increased.

That is, in the interior of the combustion chamber 110 of the biomass combustion system according to the present invention, as indicated by the arrow in FIG. 3, the first air supply unit 400 under the grate 300 provided under the training chamber 110 Primary air is supplied, and secondary air supplied from the first air supply port 510 and the plurality of second air supply ports 520 of the second air supply unit 500 provided above the combustion chamber 110 It can maximize the operating efficiency of the combustion system.

The boiler 600 is, for example, a steam boiler, and heats the cold water supplied from the water supply tank through the water supply pump pipe and the water meter pipe with heat energy transmitted through the flame discharge unit 700 as shown in FIG. Thus, hot water is provided, and the combustion exhaust gas from the boiler 600 is discharged to the flue 610 through a cyclone dust collector, a bag filter, and a blower fan. As shown in FIG. 2, a butterfly valve, a strainer, and a pump may be provided in the feed water pump pipe. In addition, cold water may be supplied to the water supply tank for cooling the combustion chamber 110 provided in the combustion furnace 100 through a circulation pump pipe, and the water supply may be heated through heat exchange with exhausted waste heat.

In the present invention, the exhaust gas exhausted to the flue 610 in the biomass combustion system as shown in FIGS. 1 and 2 is sucked through a fan 420 for primary air and supplied to the air supply port 410 to provide a combustion chamber ( 110), it is possible to minimize the emission of nitrogen oxides (NOx) into the atmosphere.

The flame discharge unit 700 is formed in a hollow cylindrical shape, and is provided above the combustion chamber 110 as shown in FIG. 1 to communicate the combustion furnace 100 and the boiler 600. The flame discharge unit 700 is provided with a third air supply unit that prevents the fly ash of the fuel burned in the combustion chamber 110 from scattering and fouling in the boiler 600. The third air supply unit will be described with reference to FIGS. 2 and 4.

4 is a cross-sectional view showing the structure of a third air supply unit in the flame discharge unit 700 shown in FIG. 2.

As shown in FIGS. 2 and 4, the third air supply unit includes a plurality of through holes 710 provided over the entire circumference of the flame discharge unit 700, and the flame discharge unit through the through holes 710. An air box 720 for holding air (tertiary air) to be supplied into the interior of 700, a tertiary air supply pipe 730 connected to the air box 720, and the tertiary air supply pipe 730 And a fan 740 for tertiary air supplying tertiary air to the air box 720 through the air box 720.

As shown in FIG. 4, each of the plurality of through holes 710 has a tangential orbiting structure from the boiler 600 toward the combustion chamber 110. That is, each of the plurality of through holes 710 is provided to be inclined at 40 to 60 degrees. In addition, although the structure in which the six through holes 710 are provided is shown in FIG. 4, the structure is not limited thereto, and may be provided with 3 to 5 or 8 to 10.

In the biomass combustion system according to the present invention, a third air supply unit is provided so that the air generated by the tertiary air fan 740 passes through the tertiary air supply pipe 730 and the air box 720 through each through hole ( Since the third air is supplied from the boiler 600 to the combustion chamber 110 against the direction of the flame propagating from the combustion chamber 110 to the boiler 600, that is, the tertiary air is supplied to the boiler 600. It can block the fly ash and stabilize the flame. Accordingly, in the biomass combustion system according to the present invention, combustion efficiency can be improved, and fouling in the boiler 600 can be prevented, thereby increasing the operating efficiency of the system.

Next, a biomass combustion system according to the present invention and a combustion system according to the prior art are compared and described with reference to FIGS. 5 and 6.

5 is a graph showing a comparison state of the CO concentration according to the air ratio in the present invention and the prior art, and FIG. 6 is a graph showing the comparison state of the NOx concentration according to the air ratio in the present invention and the prior art.

In addition, in FIGS. 5 and 6, FRG (Flue gas recirculation) refers to a structure in which exhaust gas recycled according to the present invention is supplied as primary air, and Hi-TAB (High Temperature Air Blowing) is high temperature according to the present invention. It refers to a structure that injects air (secondary air) at high speed.

As can be seen from FIG. 5, the biomass combustion system (red part) according to the present invention reduces the CO concentration according to the air ratio compared to the conventional technology (black part), thereby increasing the combustion efficiency, and operating air fuel ratio (O ₂ It can be seen that the operating area increases due to the decrease in concentration), thus increasing the efficiency of the system.

In addition, as can be seen from FIG. 6, it was found that the biomass combustion system (red part) according to the present invention reduced the NOx reduction concentration according to the air ratio compared to the conventional technology (black part), thereby generating low-polluting substances. .

Although the invention made by the present inventor has been described in detail according to the above embodiment, the invention is not limited to the above embodiment, and can be changed in various ways without departing from the gist of the invention.

By using the high-efficiency, low-pollution biomass combustion system according to the present invention, the generation of nitrogen oxides (NOx) and clinker can be prevented, and fouling can be prevented to maximize combustion efficiency.

100: combustion furnace
200: fuel supply unit
300: grate
400: first air supply unit
500: second air supply unit
600: boiler
700: flame discharge part

Claims (9)

As a highly efficient and low pollution biomass combustion system,
Combustion furnace with a combustion chamber,
A fuel supply unit for supplying biomass as fuel to the combustion chamber,
A fire grate for supporting the fuel supplied to the combustion chamber,
A first air supply unit for supplying exhaust gas and air recirculated to the lower portion of the grate in the combustion chamber,
A second air supply unit supplying air from an upper portion of the combustion chamber to a lower portion of the flame of the fuel,
And a flame discharge unit supplying thermal energy to the boiler from the upper part of the combustion chamber and blocking fly ash flowing into the boiler,
The second air supply unit includes a plurality of first air supply ports and a plurality of second air supply ports in which supply pipes forming an air flow path are installed in the refractory of the combustion chamber so that secondary air can be heated through radiant heat of the flame,
Part of the plurality of second air supply ports is provided above the fuel supply unit, and some of the plurality of second air supply ports are provided below the flame discharge unit. In claim 1,
The biomass combustion system, wherein the flame discharge unit is provided with a third air supply unit that prevents fouling in the boiler by scattering fly ash in the combustion chamber. In paragraph 2,
The first air supply unit prevents a clinker that may be generated during biomass combustion by suppressing an increase in the overall flame temperature and the temperature of the flame formed on the surface of the grate by mixing primary combustion air and recirculating exhaust gas,
The biomass combustion system, wherein the second air supply unit injects high-temperature air. In paragraph 3,
The plurality of first air supply ports are provided above the combustion chamber, and the plurality of second air supply ports are provided at side surfaces of the combustion chamber. In paragraph 2,
The third air supply unit includes an air box provided over the entire circular circumference of the flame discharge unit and for holding air to be supplied into the flame discharge unit through a plurality of tangential through holes toward the boiler combustion chamber and the tangential through holes. Including, biomass combustion system, characterized in that inducing the swirling flow of the flame. In claim 4,
The grate is provided to be inclined toward the flame discharge portion in the combustion furnace,
A plurality of air supply ports are provided in the first air supply unit,
The biomass combustion system, characterized in that the diameters of the plurality of air supply ports are formed differently. In claim 4,
The grate is provided to be inclined toward the flame discharge portion in the combustion furnace,
Biomass combustion, characterized in that each of the plurality of first air supply ports and the plurality of second air supply ports is provided at a height corresponding to the grate inclined from the right top of the grate and injects high-temperature air to the lower end of the flame to supply it. system. delete In claim 4,
Biomass combustion system, characterized in that the injection speed of the air injected from the first air supply unit and the second air supply unit are different.

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