JP7284630B2 - Pulverized coal burner device and its combustion method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pulverized coal burner device using pulverized coal of carbonized general waste such as municipal waste as fuel, and a combustion method thereof.

Use of fossil fuels by obtaining charcoal by carbonizing general waste (municipal garbage, etc.), which has conventionally been incinerated, under low-oxygen or non-oxygen conditions, and substituting part of the charcoal for fossil fuels. Efforts are being made to reduce the amount of waste and reduce the environmental burden.

However, the charcoal made from general waste contains chlorine, and there is a concern that dioxin will be generated when it is burned as fuel. Desalting treatment is performed by washing with water to wash out the chlorine content. Then, after dehydrating to a certain extent (for example, about 30% in water content) with a dehydrator (filter press or the like), it is dried to an absolutely dry state with a dryer.

The desalted charcoal is, for example, made into pellets and put into an incinerator or the like to be used as an auxiliary fuel, or is finely carbonized by a grinder (mill or the like) and used as a burner fuel. After the desalination and dehydration, if the product is kept in a moist state with a certain amount of water left without being dried, problems such as dust explosion and spontaneous combustion can be prevented, and handling properties may be improved. .

As a pulverized coal burner, for example, as in Patent Documents 1 and 2, a plurality of pulverized coal nozzles are arranged around a heavy oil nozzle, and pulverized coal from each pulverized coal nozzle is emitted into the flame formed in front of the heavy oil nozzle. There is also a configuration in which the pulverized coal in the air-fuel mixture is gasified and burned by injecting the air-fuel mixture.

In addition, as in Patent Document 3, a supply duct for supplying a mixture of pulverized coal and compressed air to the pulverized coal nozzle is connected in the orthogonal direction, and the mixture is formed in front of the heavy oil nozzle so as to form a swirling flow. There is also a structure that effectively mixes with the flame to gasify and burn.

JP 2019-27647 A JP 2019-27648 A JP 2017-15305 A

However, when it is attempted to finely carbonize the wet charcoal and supply it to the burner, there is a possibility that, in Patent Documents 1 and 2, adhesion and clogging may occur at the curved tube part in the middle of the fine coal nozzle, resulting in misfiring.

Further, in Patent Document 3, since the supply duct and the pulverized coal nozzle are connected in the orthogonal direction, adhesion and clogging are likely to occur at the orthogonal portion as well.

Furthermore, when the pulverized coal is in a moist state of about 30%, the pulverized coal particles tend to stick to each other (due to surface tension), and as a result of the large particle size, the dispersibility at the time of injection from the nozzle tip decreases. As a result, it cannot be properly blown into the flame, and gasification and combustion efficiency may decrease. Therefore, it has been a challenge to properly combust the charcoal by the pulverized coal burner while keeping the charcoal that has been washed with water by the desalting treatment in a moist state in order to improve handling.

In view of the above points, in order to solve the above problems, the present invention provides a pulverized coal burner that uses pulverized coal as burner fuel by injecting pulverized coal from a pulverized coal nozzle as described in claim 1, wherein: A throat is connected to the tip of the burner body of the charcoal burner, and a pulverized coal nozzle that injects pulverized coal is arranged in a straight pipe from the pulverized coal cutting and feeding part behind it to the throat at the tip of the nozzle. A heavy oil nozzle is provided side by side, and an annular flame stabilization plate having a diameter larger than the inner diameter of the burner body is provided in the throat in front of the nozzle, and is turned near the injection port of the pulverized coal nozzle. In order to generate a flow, an outside air introduction nozzle is connected, and the flow rate of the outside air from the outside air introduction nozzle is adjustable so that the air-fuel mixture in the pulverized coal nozzle is maintained in a dispersed state as a required swirling flow from the pulverized coal nozzle. To provide a pulverized coal burner device characterized by blowing into a flame in a flame region formed in a throat in front of a flame plate .

In addition, as described in claim 2, the outside air introduction nozzles are connected to both sides of the pulverized coal nozzle in a symmetrical manner horizontally or vertically from the tangential direction , and the flow rate of outside air to the outside air introduction nozzle can be adjusted freely. is provided, and the pulverized coal is stably burned by increasing or decreasing the flow velocity of the introduced outside air according to the burner combustion amount.

Further, as described in claim 3, the wet pulverized coal is supplied from the pulverized coal nozzle to the pulverized coal burner, and the high temperature gas discharged from the pulverized coal burner is introduced into the base end portion of the pulverized coal nozzle. To provide a pulverized coal burner device characterized in that the pulverized coal is heated by connecting as follows.

Furthermore, a pulverized coal burner that uses undried wet pulverized coal from a pulverized coal nozzle as burner fuel after desalting the carbide obtained by carbonizing general waste as described in claim 4. In the combustion method, a throat is connected to the tip of the burner body of the pulverized coal burner, and a pulverized coal nozzle for injecting pulverized coal is connected to the center of the pulverized coal burner. is arranged in a straight pipe shape over the throat of the burner, a heavy oil nozzle is arranged side by side, and an annular flame stabilizing plate having a diameter larger than the inner diameter of the burner body is provided in the throat in front of the pulverized coal nozzle, In order to generate a swirl flow near the injection port of the pulverized coal nozzle, an outside air introduction nozzle is connected so that the flow rate of the outside air can be adjusted , and the mixture in the pulverized coal nozzle is dispersed as a swirl flow from the pulverized coal nozzle. To provide a pulverized coal burner combustion method characterized by blowing into a flame in a flame region formed at a throat in front of a flame stabilizing plate .

A pulverized coal burner apparatus according to the present invention is a pulverized coal burner that uses pulverized coal as burner fuel by injecting pulverized coal from a pulverized coal nozzle. The throat is connected, and a pulverized coal nozzle for injecting pulverized coal is arranged in a straight pipe from the pulverized coal cutting and feeding part behind it to the throat part at the tip of the nozzle , and heavy oil is placed on the side. Nozzles are arranged side by side, an annular flame stabilization plate having a diameter larger than the inner diameter of the burner body is provided in the throat in front of the nozzle, and an outside air introduction nozzle is provided in order to generate a swirling flow near the injection port of the pulverized coal nozzle. is provided so that the flow rate of the outside air from the outside air introduction nozzle can be adjusted, and the air-fuel mixture in the pulverized coal nozzle is dispersed as a required swirling flow. By blowing into the flame in the flame area , even if the pulverized coal in an undried wet state after desalting the carbide obtained by carbonizing general waste, the pulverized coal nozzle can be pulverized. Since it is a straight pipe from the charcoal cutting and feeding part to the throat part at the tip of the nozzle, the flow speed of the outside air from the outside air introduction nozzle is adjusted by the outside air flow velocity adjustment device without the pulverized coal sticking to the pulverized coal nozzle or clogging it. It can be appropriately blown into the flame of the flame area formed in the throat in front of the flame stabilizing plate formed in front of the heavy oil nozzle in a dispersed state and properly combusted by the pulverized coal burner.
For example, the faster the external air flow speed, the more swirling force is imparted to the air-fuel mixture in the pulverized coal nozzle, which increases the dispersibility and widens the injection angle when injecting pulverized coal. The injection angle at the time of pulverized coal injection becomes narrower, and by adjusting the pulverized coal injection angle by adjusting the flow velocity of the introduced outside air, the pulverized coal is always properly injected into the flame, and the pulverized coal is stabilized without unburned matter. can be gasified and burned.
In addition, if the pulverized coal is in a wet state, problems peculiar to pulverized coal, such as dust explosion and spontaneous combustion, can be resolved, and handleability can be improved, and combustion treatment can be performed as described above.

Further, in the pulverized coal burner device, as described in claim 2, the outside air introduction nozzles are connected to both sides of the pulverized coal nozzle in a laterally or vertically symmetrical manner tangentially to adjust the flow velocity of the outside air to the outside air introduction nozzles. A tangential direction of left-right or top-bottom symmetry on both sides of the pulverized coal nozzle is achieved by freely installing an air blowing volume adjusting device and adjusting the flow velocity of the introduced outside air according to the burner combustion volume to ensure stable combustion of the pulverized coal. The flow rate of outside air is adjusted freely by the outside air introduction nozzle from the pulverized coal nozzle. Therefore, pulverized coal can be stably burned.
For example, when the burner combustion rate is fully open, the air flow increases and the back pressure on the back side of the flame stabilization plate increases, and the flame formed in front of the heavy oil nozzle is strongly attracted to the flame stabilization plate side, Proximity to On the other hand, when the amount of burner combustion decreases, the amount of combustion air blown decreases, the back pressure on the back surface of the flame-stabilizing plate decreases, and the position of the flame in front of the heavy oil nozzle moves away from the flame-stabilizing plate. The pulverized coal can be properly blown into the flame, and the pulverized coal can be stably gasified and burned without unburned matter.

Further, the pulverized coal burner device supplies the pulverized coal in a wet state from the pulverized coal nozzle to the pulverized coal burner, and the high temperature gas discharged from the pulverized coal burner is passed through the pulverized coal nozzle. The hot gas discharged from the pulverized coal burner heats and dries wet pulverized coal supplied to the pulverized coal nozzle by connecting to the base end to heat the pulverized coal. It is possible to prevent the pulverized coal from adhering to or clogging the pulverized coal nozzle, thereby improving the dispersibility at the time of injection as described above and properly burning with the pulverized coal burner.

Furthermore, in the pulverized coal burner combustion method, as described in claim 4, after desalting the carbide obtained by carbonizing general waste, undried wet pulverized coal is jetted from the pulverized coal nozzle. A pulverized coal burner combustion method in which a pulverized coal burner is used as burner fuel, wherein a throat is connected to the tip of the burner body of the pulverized coal burner, and a pulverized coal nozzle for injecting pulverized coal is attached to the center of the throat. It is arranged in a straight pipe shape from the cutting and feeding part to the throat part at the tip of the nozzle, a heavy oil nozzle is arranged side by side, and an annular ring having a diameter larger than the inner diameter of the burner body is placed in the throat in front of the pulverized coal nozzle. The flame stabilization plate is provided, and the external air introduction nozzle is connected so that the flow speed of the external air can be adjusted in order to generate a swirling flow near the injection port of the pulverized coal nozzle, and the mixture in the pulverized coal nozzle is turned into a swirling flow. By blowing in a dispersed state from the pulverized coal nozzle into the flame of the flame area formed in the throat in front of the flame stabilization plate , the charcoal obtained by carbonizing general waste is desalted, and then undried wet Even if the pulverized coal is in a state, the pulverized coal does not adhere to or clog the pulverized coal nozzle as described above. It can be properly blown in the state and properly combusted with a pulverized coal burner. In addition, if the pulverized coal is in a wet state, problems peculiar to pulverized coal, such as dust explosion and spontaneous combustion, can be resolved, and handleability can be improved, and combustion treatment can be performed as described above.

A schematic system diagram of one embodiment of the present invention, Enlarged cross-sectional view of the burner main body same as above, AA sectional view of the pulverized coal burner part of the same as above, BB cross-sectional view of the same throat portion, Schematic diagram of the test facility same as above, Explanatory drawing of injection angle measurement same as above, The relationship diagram of the flow velocity of the introduced outside air and the injection angle of the same as above, Explanatory diagrams (a) and (b) of the state of adhesion inside the pipe of the pulverized coal nozzle same as above The particle size distribution diagram after pulverized coal injection same as the above.

A pulverized coal burner apparatus and a combustion method thereof according to the present invention are a pulverized coal burner that uses pulverized coal as burner fuel by injecting pulverized coal from a pulverized coal nozzle. At the center, a pulverized coal nozzle for injecting pulverized coal is arranged in a straight pipe from the pulverized coal cutting and feeding section behind it to the throat at the tip of the nozzle , and a heavy oil nozzle is arranged side by side. An annular flame stabilizing plate having a diameter larger than the inner diameter of the burner body is provided in the throat in front of the nozzle, and an outside air introduction nozzle is connected to generate a swirling flow near the injection port of the pulverized coal nozzle, A flame in a flame region formed from the pulverized coal nozzle to the throat in front of the flame stabilizing plate by adjusting the flow rate of the outside air from the outside air introduction nozzle and dispersing the air-fuel mixture in the pulverized coal nozzle into a required swirling flow. It is characterized by blowing inside.

As shown in FIG. 1, the pulverized coal burner device 1 has a truncated cone-shaped throat 4 connected to the tip of a cylindrical burner body 3 of a pulverized coal burner 2, and a pulverized coal burner having a predetermined diameter at the center of the throat. A pulverized coal nozzle 5 is arranged as a straight pipe, and heavy oil nozzles 6 are provided on both sides thereof so as to enable combustion with a required thermal power.

Inside the throat 4 in front of these nozzles 5 and 6, an annular flame stabilization plate 7 having a slightly larger diameter than the inner diameter of the burner body 3 is provided. 4 so that it can be blown into the flame zone formed in it.

At the rear end of the pulverized coal nozzle 5, as shown in FIG. 1, a rotary valve 9 is connected so that pulverized coal can be cut out from a pulverized coal storage bin 8 for storing pulverized coal, and a pulverized coal blower 10 for pulverized coal pressure feeding is provided. is provided, and the pulverized coal cut out by the rotary valve 9 is pressure-fed from the pulverized coal cutting and feeding part through the throat part 4 at the tip of the nozzle to the pulverized coal nozzle 5 made into a straight tube by the blowing of the pulverized coal blower 10. I am trying to

In the vicinity of the injection port in the front part of the pulverized coal nozzle 5 having the tip of such an inverse tapered shape, an external air introduction nozzle is provided in order to generate a symmetrical swirling flow from the tangential direction on both sides of the pulverized coal nozzle 5. 11 are connected to each other, and the air-fuel mixture in the pulverized coal nozzle 5 is swirled by the introduction of outside air so that it can be blown into the flame in a dispersed state at the time of injection. Reference numeral 12 denotes an air blowing amount adjusting device for the inverter, which makes it possible to adjust the air blowing amount of the pulverized coal blower 10 in accordance with the amount of pulverized coal extracted from the pulverized coal storage bin 8 .

Regarding the connection position of the outside air introduction nozzle 11, if the distance from the nozzle tip is too long, the swirling force will be attenuated. location is preferred. In addition, the outside air inflow velocity from the outside air introduction nozzle 11 is set to about 70 to 120 m/s, and the flow velocity of the mixture in the pulverized coal nozzle 5 is set to about 10 to 20 m/s so that it can be blown into the flame in a swirling state. .

When the outside air introduction nozzle 11 is connected to the pulverized coal nozzle 5 from the tangential direction so that it can be connected to these inner peripheral surfaces without a step, as shown in FIG. The pulverized coal swirls smoothly along the way, and the pulverized coal that is pumped can be effectively dispersed as a swirling flow at the time of injection, which is preferable because a proper flame can be produced. It should be noted that the external air introduction nozzle 11 is preferably connected in a substantially orthogonal state to the longitudinal direction of the pulverized coal nozzle 5, as shown in FIGS. It is also possible to connect in an inclined state of about several tens of degrees in the front-rear direction within the range where a swirling flow can be generated.

As shown in FIG. 4, the heavy oil nozzles 6 provided on both sides of the pulverized coal nozzle 5 can be supplied with the required amount of heavy oil fuel supplied from the heavy oil tank by means of the heavy oil supply pump 13 and the flow control valve 14. , the pulverized coal jetted from the pulverized coal nozzle 5 is blown into the flame region formed in front of each heavy oil nozzle 6 to gasify and ignite and burn.

At the rear end of the burner main body 3, as shown in FIG. The amount of air blown by the air blower 16 is adjusted to supply the burner main body 3 with the amount of air for combustion corresponding to the amount of combustion of the burner. Further, 18 is an outside air blower for supplying outside air to the outside air introduction nozzle 11, and 19 is an air volume adjusting device for the inverter.

When the burner combustion amount is fully open, the amount of air blown from the combustion air blower 16 increases and the back pressure on the rear surface of the flame stabilization plate 7 increases. It is strongly attracted to the plate 7 side and approaches the flame stabilization plate 7 (f1 in FIG. 2). On the other hand, when the burner combustion amount decreases, the amount of air blown from the combustion air blower 16 decreases and the back pressure on the back surface of the flame stabilization plate 7 decreases. (f2 in FIG. 2).

Further, the faster the outside air flow speed, the more swirling force is imparted to the air-fuel mixture in the pulverized coal nozzle 5, and the greater the dispersibility, the wider the injection angle when injecting pulverized coal (α1 in FIG. 2). Conversely, when the outside air velocity is low, the dispersion force decreases, and the injection angle at the time of pulverized coal injection becomes narrow (α2 in FIG. 2). As described above, there is a correlation between the outside air flow velocity and the pulverized coal injection angle. By adjusting the flow velocity of outside air to increase or decrease the pulverized coal injection angle, the pulverized coal can be properly blown into the flame at all times, and the pulverized coal can be stably gasified and burned without unburned matter. In this embodiment, the pulverized coal injection angle can be adjusted within a range of approximately 45 to 75 degrees.

Further, the pulverized coal burner device 1 is provided with a combustion controller 20 and the like to control the operation and output of the rotary valve 9, the pulverized coal blower 10, the heavy oil supply pump 13, the combustion air blower 16, the outside air blower 18 and the like. When the device is operated, it is possible to appropriately adjust and control the increase or decrease in response to the required burner combustion.

The high temperature gas discharged from the pulverized coal burner 2 is introduced into the base end of the pulverized coal nozzle 5 to heat the pulverized coal, and the pulverized coal in a wet state is heated by the discharged high temperature gas. It can also be dried.

In the present invention, in particular, pulverized coal in an undried wet state (for example, a moisture content of about 30%) after desalting and desalting the charcoal obtained by carbonizing general waste such as municipal waste can be targeted. can. After desalination treatment, by maintaining a water content of about 30% without drying treatment, problems such as dust explosion and spontaneous combustion do not occur, handling properties can be improved, and there is no problem as a burner fuel. It can be used and has a wide range of uses and is effective. The present invention can be suitably applied to wet pulverized coal, which tends to adhere, but can also be applied to various dry pulverized coals.

FIG. 1 and subsequent drawings show an embodiment of the present invention. As shown in FIGS. 1 and 2, a pulverized coal burner device 1 has a truncated conical throat 4 connected to the tip of a cylindrical burner body 3 of a pulverized coal burner 2, and pulverized coal is injected into the center thereof. A pulverized coal nozzle 5 having a predetermined diameter is arranged as a straight pipe from a pulverized coal cutting and feeding portion to a throat portion 4 at the tip of the nozzle, and heavy oil nozzles 6 are provided on both sides thereof as shown in FIGS. The nozzles 5 and 6 are designed to blow into the flame region formed in the throat 4 in front of the flame stabilizing plate 7 .

The tip of the pulverized coal nozzle 5 has a reverse tapered shape, and the tip of the pulverized coal nozzle 5 is symmetrical from the tangential direction on both sides of the pulverized coal nozzle 5 at a position about 100 to 200 mm from the nozzle tip near the injection port in the front part as shown in FIGS. The external air introduction nozzles 11 for generating a swirling flow are connected perpendicularly to the longitudinal direction of the pulverized coal nozzle 5, respectively, and the air-fuel mixture in the pulverized coal nozzle 5 is swirled by introducing the external air, and the burner combustion amount It is designed so that it can be blown into the flame in the required dispersed state at the time of injection according to the requirements.

The pulverized coal burner device 1 was tested using the test facility shown in FIG. In FIG. 5, 101 is this test apparatus, 105 is a pulverized coal nozzle, 108 is an injection hopper for pulverized coal injection, 109 is a rotary valve, 110 is a pulverized coal blower, 111 is an outside air introduction nozzle, 118 is an outside air blower, and 121 is an outside air blower. A screw conveyor, 122 and 123 are air volume sensors, 124 is a temperature sensor, and 125 is a camera.

In order to confirm the injection state of the pulverized coal, only the injection test of the pulverized coal was performed in the test apparatus 101 without actually performing combustion. In the test, the air volume from the pulverized coal blower 110 and the outside air blower 118 is detected by the air volume sensors 122 and 123, each flow velocity is calculated, and the temperature sensor 124 detects the flow rate immediately after injection from the tip of the nozzle (at a point of 1 m). ) was detected, the camera 125 photographed the injection state of pulverized coal, and the injection angle was measured based on the image data. The pulverized coal injection angle α is an angle connecting the outer edge of the injection area at a point 250 mm from the center of the tip of the pulverized coal nozzle 105 as shown in FIG.

Carbonized fuel of pulverized coal in a wet state (water content of about 31 to 33%) is cut out by a rotary valve 109 from an input hopper 108 via a screw conveyor 121 and fed into a straight pulverized coal nozzle 105, followed by a pulverized coal blower. It was pumped with a required amount of pumping air at 110, and pulverized coal was injected under the following conditions.

The connection position of the outside air introduction nozzle 111 is 150 mm from the nozzle tip, the pulverized coal supply amount is 90 kg / h, the pulverized coal pressure feed air flow rate is 15 m / s, and the introduction outside air flow rate is 50 m / s (low speed) or 100 m / s (high speed). ), and the outlet air temperature of the pulverized coal nozzle 105 was 10° C. (normal temperature) or 90° C. (high temperature). The results are shown in FIG.

When the outlet air temperature of the pulverized coal nozzle 105 is 10° C., the pulverized coal injection angle is about 38° (No. 1) when the wind speed of the introduced outside air is 50 m/s, and the flow speed of the introduced outside air is 100 m/s. At times, the pulverized coal injection angle was about 61° (No. 2), and it was confirmed that the higher the flow velocity of the introduced outside air, the larger the pulverized coal injection angle.

Further, when the outlet air temperature is 90° C., the pulverized coal injection angle is about 49° (No. 3) when the wind speed of the introduced outside air is 50 m/s, and the pulverized coal is was approximately 72° (No. 4), and it was confirmed that the injection angle of pulverized coal was slightly increased by raising the outlet air temperature. At this time, when the moisture content of the pulverized coal injected from the pulverized coal nozzle 105 was confirmed, it was about 29 to 30% when the outlet air temperature was 10°C, while it was about 21 to 23% when the outlet air temperature was 90°C. The moisture content decreased by about 7 to 8%, which is presumed to be due to the improved dispersibility of the pulverized coal as a result of drying by heating with high-temperature compressed air.

In addition, FIG. 8 shows the adhesion state of pulverized coal inside the pulverized coal nozzle 105 pipe. A slight deposit of pulverized coal was observed, and no deposit was observed when the outlet air temperature was set to 90° C. as shown in FIG. 8(b). This is also presumed to be due to the fact that the adherence of pulverized coal was reduced as a result of heating and drying with high-temperature compressed air.

Further, FIG. 9 is a distribution diagram of the particle size of the pulverized coal immediately after injection from the pulverized coal nozzle 105. When the outlet air temperature of the pulverized coal nozzle 105 is 90° C. (No. 4), ), the peak at 500 to 600 μm disappears. This is also presumed to be due to the decrease in adhesion (surface tension) between the pulverized coal particles and the reduction in particle size as a result of heating and drying with high-temperature compressed air, as described above.

INDUSTRIAL APPLICABILITY The present invention can be widely used for pulverized coal burners using as fuel pulverized coal obtained by carbonizing general waste such as municipal waste, especially pulverized coal in a wet state after desalination.

DESCRIPTION OF SYMBOLS 1... Pulverized coal burner apparatus 2... Pulverized coal burner 4... Throat 5... Pulverized coal nozzle 11... Outside air introduction nozzle

Claims (4)

A pulverized coal burner that uses pulverized coal as burner fuel by injecting pulverized coal from a pulverized coal nozzle, the pulverized coal nozzle having a throat connected to the tip of the burner body of the pulverized coal burner and injecting pulverized coal into the center of the throat. is arranged in a straight pipe from the pulverized coal cutting and feeding part behind it to the throat part at the tip of the nozzle , and a heavy oil nozzle is arranged side by side,
An annular flame stabilizing plate having a diameter larger than the inner diameter of the burner body is provided in the throat in front of the nozzle, and an outside air introduction nozzle is connected to generate a swirling flow near the injection port of the pulverized coal nozzle. The air-fuel mixture in the pulverized coal nozzle is dispersed as a required swirling flow by adjusting the flow rate of the outside air from the introduction nozzle . A pulverized coal burner device characterized in that it is blown into.
The external air intake nozzles are connected to both sides of the pulverized coal nozzle in a symmetrical manner in the horizontal or vertical direction from the tangential direction, and the external air intake nozzles are provided with an air volume adjustment device that allows the flow velocity of the external air to be adjusted freely, and is introduced according to the burner combustion amount. 2. The pulverized coal burner apparatus according to claim 1, wherein the pulverized coal is stably burned by adjusting the flow velocity of the outside air.
Pulverized coal in a wet state is supplied from a pulverized coal nozzle to a pulverized coal burner, and the high temperature gas discharged from the pulverized coal burner is connected to the base end of the pulverized coal nozzle to heat the pulverized coal. 3. The pulverized coal burner apparatus according to claim 1 or 2, characterized in that it is configured as follows.
A pulverized coal burner combustion method in which charcoal obtained by carbonizing municipal waste is desalted and then undried wet pulverized coal is jetted from a pulverized coal nozzle to be burner fuel, comprising:
A throat is connected to the tip of the burner body of the pulverized coal burner, and a pulverized coal nozzle for injecting pulverized coal is formed in the center of the pulverized coal burner. A heavy oil nozzle is arranged side by side, and an annular flame stabilizing plate having a diameter larger than the inner diameter of the burner body is provided in the throat in front of the pulverized coal nozzle,
In order to generate a swirl flow near the injection port of the pulverized coal nozzle, an outside air introduction nozzle is connected so that the flow rate of the outside air can be adjusted , and the mixture in the pulverized coal nozzle is dispersed as a swirl flow from the pulverized coal nozzle. A combustion method for a pulverized coal burner, characterized by blowing into a flame in a flame region formed in a throat in front of a flame stabilizing plate .

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