KR102403109B1 - Grinder and its operation method - Google Patents

Abstract

The purpose of this is to detect that rapid combustion has occurred or just before the occurrence of rapid combustion, and inject the extinguishing agent at an appropriate position and timing. A first pressure detection unit provided in the vicinity of the crushing unit 1A to detect the pressure inside the housing 31, and a first pressure detection unit installed in the vicinity of the classifying unit 1B to detect the pressure inside the housing 31 It is provided in the vicinity of the second pressure detection unit and the crushing unit 1A, and when it is determined based on the pressure detected by the first pressure detection unit or the second pressure detection unit that rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion , a fire extinguishing agent injector 51 for injecting a fire extinguishing agent to the crushing unit, and installed in the vicinity of the classifying unit 1B, based on the pressure detected by the first pressure detecting unit or the second pressure detecting unit, rapid combustion of fuel occurs Alternatively, when it is determined that it is immediately before the occurrence of rapid combustion, a fire extinguishing agent injector 52 is provided for injecting a fire extinguishing agent to the classifying unit 1B.

Description

Grinder and its operation method

The present invention relates to a pulverizer equipped with a fire extinguishing facility and a method for operating the same.

Solid fuels, such as coal and biomass used in a thermal power plant etc., are grind|pulverized into fine powder by a mill (pulverizer), and are supplied to combustion apparatuses, such as a boiler. The mill pulverizes solid fuels, such as coal and biomass, which are injected|thrown-in from the coal feed pipe (or biomass supply pipe|tube) to the grind|pulverization rotary table, and crushes it between a grind|pulverization rotary table and a grind|pulverization roller. Then, the pulverized fuel in the form of fine powder is blown up by the carrier gas supplied from the outer periphery of the pulverization rotary table, and can be sieved by a classifier according to the particle size. The fuel with a small particle size is conveyed to a combustion apparatus.

BACKGROUND ART Biomass fuel attracts attention as one of measures to reduce carbon dioxide emissions from boilers using fossil fuels. The biomass fuel is supplied to the mill in the form of pellets and pulverized, but since it is easy to ignite, for example, by static electricity, there is a high possibility of causing rapid combustion. Therefore, when biomass is used as a fuel, since rapid combustion occurs more easily than coal (pulverized coal), reinforcement|strengthening of safety management is needed.

Patent Document 1 discloses that a pressure sensor is disposed in a vertical roller mill, and when the pressure sensor detects occurrence of rapid combustion, an extinguishing agent is immediately ejected to prevent rapid combustion from becoming serious.

Japanese Patent Laid-Open No. 2010-242999 US Patent No. 9421551 Specification

However, although patent document 1 discloses that the occurrence of rapid combustion is detected by the pressure sensor and the extinguishing agent is ejected, there is no description regarding the installation position of the extinguishing agent injector or the installation position of the pressure sensor in consideration of suppression of rapid combustion. Also, in Patent Document 2, there is a disclosure regarding the installation of a plurality of fire extinguishing agent injectors, but it is not specifically disclosed about the operational conditions of the mill, such as the mutual operation relation of the fire extinguishing system facilities, the operation procedure, and the control point. not.

In rapid combustion, since a flame spreads rapidly, it is estimated that the suppression effect of rapid combustion becomes high by providing many fire extinguishing agent injectors, but it becomes a cost increase. For this reason, it is desired to optimize the number of installations of fire extinguishing agent injectors and the quantity of a fire extinguishing agent, and to reduce it as much as possible.

However, the time at which the extinguishing agent injector injects the extinguishing agent is short, for example, several tens of milliseconds, and since the sprayable range of the extinguishing agent is also limited, just spraying the extinguishing agent only at the place where rapid combustion occurs It is difficult to suppress the flame. When the distance to a flame with an extinguishing agent injector is too long, a flame will develop large and a large amount of extinguishing agent will be needed. Therefore, it is necessary to take in advance measures to prevent rapid combustion not only in the place where rapid combustion occurs, but also in the place where the flame tends to propagate.

In this way, unless it is detected that rapid combustion has occurred or just before the occurrence of rapid combustion is detected and the extinguishing agent is sprayed at an appropriate position and timing, rapid combustion cannot be suppressed, and there is a risk of damage to each machine of the mill.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pulverizer capable of detecting that rapid combustion has occurred or just before the occurrence of rapid combustion and injecting a fire extinguishing agent at an appropriate position and timing, and an operating method thereof .

The grinder according to the first aspect of the present invention includes a housing, a fuel supply pipe connected to a ceiling portion of the housing to supply fuel to the inside of the housing, and the fuel supplied from the fuel supply pipe is guided to an upper surface and a center a pulverizing unit having a rotary table rotating about an axis and a pulverizing roller disposed opposite the rotary table and rolling and pulverizing the fuel between the upper surfaces of the rotary table to produce a finely pulverized product; an air supply pipe connected to an air supply pipe for supplying air to the inside of the housing; a classifying part installed on the upper part of the housing to classify the finely pulverized material wound up by the air guided from the air supply pipe; and the housing; a pulverized material delivery pipe connected to the ceiling portion of the sieve unit to guide the pulverized material classified by the classifying unit to the outside; , a second pressure detecting unit provided in the vicinity of the classifying unit to detect the internal pressure of the housing; A first fire extinguishing agent injection unit for injecting an extinguishing agent to the crushing unit when it is determined that rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion; and a second fire extinguishing agent injecting unit that injects an extinguishing agent to the classifying unit when it is determined based on the pressure detected by the second pressure detecting unit that the rapid combustion of the fuel has occurred or is immediately before the occurrence of the rapid combustion.

According to this configuration, a first pressure detection unit and a second pressure detection unit for detecting pressure are provided in the vicinity of the crushing unit and in the vicinity of the classification unit, which may become the ignition source of rapid combustion, and the ignition source and rapid combustion are provided in the vicinity of the classification unit. A fire extinguishing agent spraying unit is provided in the vicinity of the crushing unit and in the vicinity of the classifying unit where there is a risk of propagation. When it is judged that rapid combustion of fuel has occurred or it is judged immediately before occurrence of rapid combustion, since the extinguishing agent is injected to the crushing portion and the classifying portion, the occurrence of rapid combustion and flame propagation in the mill can be suppressed or prevented.

In the first aspect, a supply unit provided on an upstream side of the fuel supply pipe for supplying the fuel to the fuel supply pipe, a third pressure detection unit installed in the supply unit to detect a pressure inside the supply unit, A third fire extinguishing agent injection unit installed in the supply unit to inject an extinguishing agent to the supply unit when it is determined that the rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion based on the pressure detected by the third pressure detection unit may be provided.

According to this configuration, a third pressure detecting unit for detecting a pressure is provided in the feeder, which is the ignition source of rapid combustion and is likely to propagate rapid combustion, and is located in the vicinity of the ignition source and the crushing unit and in the vicinity of the classification unit. An extinguishing agent spraying unit is provided. When it is judged that rapid combustion of fuel has occurred or is immediately before occurrence of rapid combustion, since the extinguishing agent is injected with respect to the feeder, generation of rapid combustion and flame propagation in the mill can be suppressed or prevented.

In the first aspect, a rotary feeder installed in the fuel supply pipe for supplying the fuel for each predetermined amount, and a current side and/or a downstream side of the rotary feeder installed in the fuel supply pipe, the first pressure Based on the pressure detected by the detection unit or the second pressure detection unit, when it is determined that the rapid combustion of the fuel has occurred or is immediately before the occurrence of the rapid combustion, a fourth extinguishing agent injection unit may further be provided for injecting the extinguishing agent into the fuel supply pipe. .

According to this configuration, the extinguishing agent injection unit is provided on the current side and/or on the downstream side of the rotary feeder installed in the fuel supply pipe where rapid combustion may propagate. Since the extinguishing agent is injected into the fuel supply pipe when it is judged that rapid combustion of fuel has occurred or is immediately before occurrence of rapid combustion, flame propagation due to rapid combustion in the mill can be suppressed or prevented.

In the first aspect, it is installed in the pulverized material delivery pipe, and based on the pressure detected by the first pressure detection unit or the second pressure detection unit, rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion. When it is determined, a fifth fire extinguishing agent spraying unit for spraying a fire extinguishing agent to the pulverized material delivery pipe may be further provided.

According to this configuration, the fire extinguishing agent injection unit is provided in the finely pulverized material delivery pipe in which rapid combustion is likely to propagate. Since the extinguishing agent is injected to the fine pulverized material delivery pipe when it is judged that rapid combustion of fuel has occurred or is immediately before occurrence of rapid combustion, flame propagation due to rapid combustion in the mill can be suppressed or prevented.

In the first aspect, in the inside of the housing, there is further provided a wall material which is a tubular member extending between the crushing roller and the classifying unit, and between the wall material and the housing, the finely pulverized product is An annular flow path wound up with air may be formed, and the first fire extinguishing agent spraying unit may spray the fire extinguishing agent into the space inside the wall material.

According to this configuration, in the case where an annular flow path through which the finely pulverized material is wound up with air is formed between the wall material extended between the pulverization roller and the rotary classifier inside the housing and the housing, Since the extinguishing agent is injected into the space, it is possible to suppress or prevent the occurrence of rapid combustion and flame propagation in the mill.

In the first aspect, the plurality of first pressure detection units and the plurality of second pressure detection units are arranged in a zigzag shape above and below the inside of the housing, so that the plurality of first fire extinguishing agent spraying units and the plurality of second pressure detection units are arranged in a zigzag manner. The fire extinguishing agent spraying units may be arranged in a zigzag manner on the upper and lower sides of the inside of the housing.

A method of operating a grinder according to a second aspect of the present invention includes a housing, a fuel supply pipe connected to a ceiling portion of the housing to supply fuel to the inside of the housing, and the fuel supplied from the fuel supply pipe is guided to an upper surface a pulverizing unit having a rotary table that rotates around a central axis and a pulverizing roller disposed opposite to the rotary table and rolling, and pulverizing the fuel between the upper surfaces of the rotary table to produce a fine pulverized product; an air supply pipe connected to the lower part of the housing and supplying air to the inside of the housing; , a method of operating a pulverizer having a pulverized material delivery pipe connected to the ceiling portion of the housing and guiding the pulverized material classified by the classifying unit to the outside, wherein a first pressure detecting unit installed near the pulverizing unit is provided. , detects the internal pressure of the housing, a second pressure detection unit provided in the vicinity of the classifying unit detects the internal pressure of the housing, based on the pressure detected by the first pressure detection unit or the second pressure detection unit , when it is determined that the rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion, a first fire extinguishing agent injection unit installed in the vicinity of the crushing unit injects an extinguishing agent to the crushing unit, and the first pressure detecting unit or the second When it is determined based on the pressure detected by the pressure detection unit that the rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion, a second extinguishing agent injection unit installed in the vicinity of the classification unit injects the extinguishing agent to the classification unit .

According to the present invention, it is possible to detect that rapid combustion has occurred or just before the occurrence of rapid combustion, and inject the extinguishing agent at an appropriate position and timing.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the boiler installation provided with the mill which concerns on one Embodiment of this invention.
Fig. 2 is a longitudinal sectional view showing a mill according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view showing a mill according to an embodiment of the present invention, and is an arrow view taken along the line III-III in Fig. 2 .
Fig. 4 is a cross-sectional view showing a mill according to an embodiment of the present invention, and is an arrow view taken along line IV-IV in Fig. 2 .
5 is a partially enlarged cross-sectional view showing a housing of a mill, an extinguishing agent injector, and a pressure-sensitive sensor according to an embodiment of the present invention.
Fig. 6 is a partially enlarged longitudinal sectional view showing a housing of a mill and a pressure-sensitive sensor according to an embodiment of the present invention.
Fig. 7 is a longitudinal sectional view showing a first modified example of the mill according to the embodiment of the present invention.
Fig. 8 is a cross-sectional view showing a first modified example of the mill according to the embodiment of the present invention, and is an arrow view taken along the line VIII-VIII in Fig. 7 .
Fig. 9 is a cross-sectional view showing a second modified example of the mill according to the embodiment of the present invention, and is an arrow view taken along the line III-III in Fig. 2 .
Fig. 10 is a cross-sectional view showing a second modified example of the mill according to the embodiment of the present invention, and is an arrow view taken along the line IV-IV in Fig. 2 .

Hereinafter, the boiler facility 10 which concerns on one Embodiment of this invention, and the mill 1 applied to the boiler facility 10 are demonstrated using FIG. 1, the boiler installation 10 provided with the mill 1 which concerns on this embodiment is shown.

The boiler facility 10 is equipped with the mill 1 which grind|pulverizes the biomass fuel supplied to the boiler body 3 . The mill 1 may be of the type which grind|pulverizes only a biomass fuel, and the type which grind|pulverizes a biomass fuel with coal may be sufficient as it. Here, biomass fuel is an organic resource derived from a renewable organism, for example, woody biomass fuel such as thinning wood, waste wood, driftwood, grass, waste, dehydrated sludge, non-woody biomass fuel such as tires, etc. to be. In addition, biomass fuel contains pellet form, chip form, recycled fuel, etc. which used these as a raw material, and is not limited to what was shown here.

In the mill 1 , biomass fuel or the like stored in a silo 5 is guided through a bunker 7 , a feeder 6 and a coal feeder 4 . A center chute 33 is connected to the mill 1 , and biomass fuel is supplied to the inside of the mill 1 through the center chute 33 . The coal feed pipe 4 and the center chute 33 constitute a fuel supply pipe according to the present invention. In addition, in this embodiment, the biomass fuel before grinding|pulverization flows through the inside of the coal feed pipe 4, Although it can also be called the fuel supply pipe before grinding|pulverization, it is called the coal feed pipe 4 according to the conventional coal mill.

A primary air duct (air supply pipe) 13 is connected to the mill 1 . The primary air duct 13 is connected to the primary air fan 15, and air in which the air preheated by the air preheater 21 and the air bypassing the air preheater 21 are mixed is guided. . In addition, a part of the exhaust gas that has passed through the electrostatic precipitator 23 via the exhaust gas recirculation fan 17 is guided to the primary air duct 13 . Accordingly, into the mill 1, a mixer whose temperature is regulated by the air preheater 21 and whose oxygen concentration is regulated by the exhaust gas is guided through the primary air duct 13.

Hereinafter, in this specification, this mixer is expressed as air supplied through the primary air duct (air supply pipe) 13, but the actual condition is the same gas as described above, and the use is for fuel pulverized by the mill 1 It is a transport gas that is transported.

The connection opening of the primary air duct 13 with the housing 31 of the mill 1 is inclined downward toward the inside of the mill 1 . Thereby, it is difficult for the fine pulverized material inside the mill 1 to be deposited in the primary air duct 13 .

The mill 1 is connected to a feeder pipe (pulverized material delivery pipe) 9 , and the finely pulverized particles pulverized by the mill 1 are guided to the burner 11 through the feeder pipe 9 . .

The pulverized material is burned in the furnace of the boiler body 3, a flame is formed by the burner 11, and steam is produced by a heat exchanger (not shown). The generated steam is guided to, for example, a steam turbine (not shown) to generate power in the steam turbine.

The exhaust gas discharged from the boiler body 3 is denitrated by the denitration device 19 , and then the air guided from the primary air fan 15 is heated in the air preheater 21 . Thereafter, the exhaust gas is guided to the electrostatic precipitator 23 , and after being exhausted by the electrostatic precipitator 23 , is guided to the desulfurization device 27 through the induction fan 25 . On the upstream side of the induction fan 25 , a portion of exhaust gas is extracted, and the extracted exhaust gas is guided to the primary air duct 13 through the exhaust gas recirculation fan 17 .

In addition, the position for extracting exhaust gas is not necessarily limited to the example shown in FIG. 1, What is necessary is just to extract from any of the exhaust gas system from the boiler main body 3 to the chimney 29. As shown in FIG.

The exhaust gas guided downstream from the induction fan 25 is desulfurized in the desulfurization device 27 , and then is guided to the chimney 29 and discharged to the atmosphere.

In FIG. 2 a detail of the mill 1 shown in FIG. 1 is shown. FIG. 2 shows a mill (crushing device) 1 for finely pulverizing biomass fuel as a raw material (fuel), and a mill facility including a raw material supply system and a pulverized material conveying system for the mill 1 . . The mill facility is provided with a fire extinguishing system facility that suppresses rapid combustion. The mill 1 is broadly divided into a crushing part 1A of a lower part and a classifying part 1B of an upper part.

The mill 1 is a vertical mill, and pulverizes a solid biomass fuel, for example, a pellet-form lignocellulosic biomass fuel.

The housing 31 of the mill 1 has a vertical cylindrical hollow shape, and a center chute 33 is provided in the central portion of the ceiling portion 32 . A coal feed pipe 4 is connected between the feeder 6 and the center chute 33 . The center chute 33 is connected to the coal feed pipe 4 , and supplies biomass fuel and/or coal derived from the bunker 7 into the housing 31 . The center chute 33 is arrange|positioned along the up-down direction (vertical direction) at the center position of the housing 31, and the lower end part is extended and provided in the housing 31 inside.

A mount 34 is installed at the lower portion of the housing 31 , and a grinding rotary table 35 is rotatably disposed on the mount 34 . The lower end of the center chute 33 is disposed to face the center of the grinding rotary table 35 . The center chute 33 supplies biomass fuel and/or coal toward the downward direction from upper direction.

A rotary feeder 43 is attached to the coal feed pipe 4 , and the rotary feeder 43 cuts out a fixed amount of biomass fuel, ie, supplies biomass fuel for each predetermined amount.

The grinding rotary table 35 is rotatable around a central axis in the vertical direction (vertical direction) and is driven by a driving device (not shown). The upper surface of the grinding rotary table 35 has a high central portion and an inclined shape that is lowered from the central portion to the outside, and has a shape in which the outer peripheral portion is curved upwardly from the inside to the outside.

A plurality of, for example, three grinding rollers 36 are disposed above the grinding rotary table 35 to face the grinding rotary table 35 . Each grinding roller 36 is arranged above the outer periphery of the grinding rotary table 35 at equal intervals in the circumferential direction (120° intervals in the case of three grinding rollers 36). In addition, in FIG. 2, although the two grinding|pulverization rollers 36 are shown symmetrically for description, when the three grinding|pulverization rollers 36 are arrange|positioned at 120 degree intervals, the arrangement|positioning of the grinding|pulverization rollers 36 is shown in FIG. different from the city of

The grinding roller 36 is pivotably connected to the pressing arm 37 via a bracket 38 . The bracket 38 is coupled to the pressing arm 37 by a hinge. The pressing arm 37 has a substantially hexagonal shape in plan view, and is respectively connected to the tension rod 39 at three points between the adjacent crushing rollers 36 . In addition, in FIG. 3, the press arm 37 and the tension rod 39 are partially abbreviate|omitted and shown.

With the above configuration, the bracket 38 is supported by the pressing arm 37 , and the grinding roller 36 is swingable with respect to the pressing arm 37 by the bracket 38 . The pressing arm 37 is connected to a tension rod 39 accommodated in the tension rod box 40 , and the position of the pressing arm 37 in the vertical direction (vertical direction) is adjusted by the tension rod 39 . . Thereby, the load acting on the solid material on the grinding rotary table 35 by the grinding roller 36 can be changed.

When the crushing rotary table 35 rotates, the crushing roller 36 is driven by the force received from the crushing rotary table 35 or the solid material, and rolls around the rotation axis of the crushing roller 36 . The biomass fuel is crushed by being pressed between the crushing rollers 36 and the crushing rotary table 35 by engagement. When the biomass fuel is pulverized, a pulverized material is produced.

A primary air duct 13 is connected to the lower portion of the housing 31 . The primary air 60 supplied by the primary air duct 13 is guided into the housing 31 and supplied to a space located below the grinding rotary table 35 .

The space on the outer peripheral side of the bracket 38 supporting the grinding roller 36 , that is, the space along the inner surface of the housing 31 , is an annular flow path 46 formed by the inner wall 45 and the housing 31 . is made of The finely pulverized material passing through the annular flow path 46 is blown up at a higher flow rate compared to a mill in which the inner wall 45 is not installed. The inner wall 45 is a tubular member, and in the inside of the housing 31, it extends upwardly from the outer peripheral side of the grinding roller 36 to the vicinity of the lower part of the rotary classifier 41, and is provided.

A rotary classifier 41 is provided at an upper portion of the housing 31 . The rotary classifier 41 is arranged to surround the center chute 33 , and rotates around the center chute 33 . With the rotation of the rotary classifier 41, the plurality of pins 42 provided on the outer peripheral side travel in the circumferential direction. The finely pulverized material pulverized by the pulverizing rotary table 35 and pulverizing roller 36 is moved upward by the flow of air rising from the lower side of the pulverizing rotary table 35 through the outer peripheral side of the pulverizing rotary table 35 . rolled up The finely pulverized material having a relatively large diameter among the rolled up pulverized material is knocked down by the pin 42, returned to the pulverization rotary table 35, and pulverized again. Thereby, the finely pulverized material is classified by the rotary classifier 41 .

A plurality of coal feeders 9 are connected to the ceiling portion 32 , and the coal feeders 9 discharge the finely pulverized material that has been classified by the rotary classifier 41 , and use the discharged finely pulverized material to the boiler body. lead to (3). The plurality of trajectory tubes 9 are respectively connected to a plurality of openings provided corresponding to the ceiling portion 32 . In addition, in this embodiment, pulverized biomass fuel flows through the inside of the coal feeder tube 9, and although it can also call it a pulverized fuel supply tube, it is called the coal feeder tube 9 according to the conventional coal mill. Although the coal trough 9 changes according to the size and grinding capacity of the mill 1, it is in the range of 2-8, and there are 4-6 cases in many cases.

The operation of the mill 1 and mill equipment according to the present embodiment for pulverizing biomass fuel will be described below.

The biomass fuel stored in the bunker 7 is conveyed by the belt of the belt feeder 8 built in the feeder 6 (a), and fed to the coal feeder 4 and the center chute 33 ( b).

The rotary feeder 43 attached to the coal feed pipe 4 cuts out a fixed amount of biomass fuel, and the biomass fuel falls toward the inside of the mill 1 (c).

The biomass fuel supplied into the mill 1 falls on the grinding rotary table 35 (d), moves to the outer peripheral side by centrifugal force, and is pulverized between the plurality of grinding rollers 36 and the grinding rotary table 35 do. The pulverized product of the pulverized biomass fuel is in the mill 1 by the primary air 60 blown into the mill 1 through the primary air duct 13 and the throat vane 44, In particular, the annular flow path 46 is raised (e). The finely pulverized material passing through the annular flow path 46 is blown up at a higher flow rate compared to a mill in which the inner wall 45 is not installed. Thereafter, the pulverized material protrudes from the upper end of the inner wall 45 .

In the upper part of the pulverization unit 1A, a rotary classifier 41 composed of a plurality of pins (blades) 42 rotates, and the coarse and heavy fine pulverized material is hit so as to be bounced by the centrifugal force of the pins 42 . dropped (f). The re-grinding is repeated in the pulverizing unit 1A until the fine pulverized material becomes fine. The finely pulverized material (fineness) passes through the rotary classifier (41), comes out of the mill (1), and is air-conveyed to the outside through the coal feeder (9) (g). The pulverized material conveyed by air is sent to the burner 11 of the boiler body 3 to be burned.

In mill facilities, pressure-sensitive sensors 61, 62, 63 for detecting abnormal pressure are provided at locations that may become ignition sources of rapid combustion, and locations where ignition sources and rapid combustion are likely to propagate. Fire extinguishing agent injectors 51 , 52 , 53 , 54 and 55 are provided.

The fire extinguishing agent injectors 51 to 55 inject the fire extinguishing agent into the mill 1 or the like at high speed in a short period of time (for example, several tens of milliseconds). The extinguishing agent sprayed by the extinguishing agent injectors 51 to 55 is, for example, sodium bicarbonate in powder form (commonly referred to as sodium bicarbonate), and is injected at high pressure by a pressurized inert gas (eg nitrogen (N ₂ )). .

The injection amount of sodium bicarbonate as a fire extinguishing agent is about 100 kg to 300 kg, in total, the quantity which the fire extinguishing agent injectors 51 and 52 installed in one mill 1 have, if one example is demonstrated. This condition is appropriately determined by the size of the mill 1, the grinding capacity, and the like. Sodium hydrogencarbonate has an advantage that not only has high fire extinguishing ability, but that the mill 1 made of steel is hard to corrode each site. After cleaning of the sprayed extinguishing agent, there is no fear of corrosion even when sodium bicarbonate is adhered to the inner wall surface of the housing 31 of the mill 1 or the like. In addition, the adhering sodium hydrogencarbonate is rubbed off with the newly supplied biomass fuel, and it is conveyed to the burner 11 of the boiler main body 3 . Since the quantity of sodium hydrogencarbonate conveyed compared with biomass fuel is a trace amount, combustion in the burner 11 is not inhibited.

As shown in FIGS. 2 and 3 , the extinguishing agent injector 51 and the pressure-sensitive sensor 61 are located in the lower side of the housing 31 of the mill 1 , in the vicinity of the crushing unit 1A in the housing 31 . , for example, is provided between the grinding roller 36 and the pressure arm 37 in the height direction of the mill 1 . One fire extinguishing agent injector 51 and one pressure-sensitive sensor 61 may be adjacently provided as a set of one set. The fire extinguishing agent injector 51 sprays the fire extinguishing agent to the crushing unit 1A. The pressure-sensitive sensor 61 detects the pressure in the housing 31 . The pressure-sensitive sensor 61 is particularly easy to detect a change in pressure in the vicinity of the crushing unit 1A. Since a change in pressure is detected in the vicinity of the crushing unit 1A, which is highly likely to be the cause of the occurrence, a shift in timing is avoided, so that a so-called time lapse does not occur. In the pressure sensor 61 , the detection tube is inclined downward into the housing 31 so that the finely pulverized material does not flow into the body side of the pressure sensor 61 .

In the vicinity of the pulverization unit 1A, the biomass fuel supplied from the center chute 33 and the pulverized pulverized material are stored and exist at a high concentration in a partially blown up state. In addition, the high-temperature primary air 60 is in contact with the biomass fuel or the pulverized material. Therefore, in the vicinity of the crushing part 1A, the potential for rapid combustion to occur is high. When the extinguishing agent is sprayed in the vicinity of the crushing unit 1A, it is possible to suppress rapid combustion having the vicinity of the crushing unit 1A as a generation source and combustion caused by propagated rapid combustion.

As shown in FIGS. 5 and 6, in the fire extinguishing agent injector 51, a piping member 56 through which the extinguishing agent flows is provided through the inner wall 45, and the distal end of the piping member 56 is a housing 31 ) is provided in Thereby, the extinguishing agent can be reliably sprayed into the inside of the space enclosed by the inner wall 45. As shown in FIG. Moreover, there is a possibility that abrasion or damage to the piping member 56 may occur due to the finely pulverized material flowing through the annular flow path 46 . Therefore, a high-strength protective material or the like may be provided on the lower surface of the piping member 56 .

The tip of the pressure-sensitive sensor 61 is located on the wall of the housing 31 . In the inner wall (45), a through hole (66) is provided in a portion opposite to the position of the tip of the pressure-sensitive sensor (61). Without providing the member of the pressure-sensitive sensor 61 in the annular flow path 46 , the tip of the pressure-sensitive sensor 61 is provided at a position deviated from the annular flow path 46 . Abrasion or damage to the pressure-sensitive sensor 61 can be prevented.

As shown in FIGS. 2 and 4, the extinguishing agent injector 52 and the pressure-sensitive sensor 62 are located in the upper side of the housing 31 of the mill 1, in the vicinity of the classifying part 1B in the housing 31. , for example, is provided on a surface opposite to the rotary classifier 41 , ie, at a horizontal position in the horizontal direction of the rotary classifier 41 . One extinguishing agent injector 52 and one pressure-sensitive sensor 62 may be provided as a set adjacent to each other. The extinguishing agent injector 51 injects the extinguishing agent to the classification unit 1B. The pressure-sensitive sensor 62 detects the pressure in the housing 31 . The pressure-sensitive sensor 62 is particularly easy to detect a pressure change in the vicinity of the classification unit 1B. Since the change in pressure is detected in the vicinity of the classification part 1B with a high possibility of becoming a generation|occurrence|production origin, shift|offset|difference in timing is avoided, and what is called a time-lapse does not fall into it. In the pressure sensor 62 , the detection tube is inclined downward into the housing 31 so that the finely pulverized material does not flow into the body side of the pressure sensor 62 .

The vicinity of the classifying part 1B in the housing 31 corresponds to the classification branching point of the blown-up fine-pulverized material, and the fine-pulverized material which is going to enter the rotary classifier 41, and the rice thrown out by the pin 42 Grind is present. Therefore, it is a region where the flow trajectories of the finely pulverized material are complicated and congested with each other. Further, there is also a collision between the pins 42 of the rotary classifier 41 and the finely pulverized material, and the friction is violently generated. Therefore, in the vicinity of the classification part 1B, the potential which rapid combustion generate|occur|produces is high. When the extinguishing agent is sprayed in the vicinity of the classification portion 1B, it is possible to suppress rapid combustion having the vicinity of the classification portion 1B as a generation source and combustion caused by propagated rapid combustion.

In the fire extinguishing agent injector 52 , the front end of the piping member 57 is provided in the housing 31 . Thereby, the extinguishing agent can be injected into the inside of the space surrounded by the housing 31 .

One set of fire extinguishing agent injectors 51 and pressure-sensitive sensor 61 or one set of fire-extinguishing agent injectors 52 and pressure-sensitive sensor 62 are provided at intervals in the circumferential direction of housing 31 . A total of three sets of fire extinguishing agent injectors 51 and pressure sensors 61 in the circumferential direction from the lower side of the housing 31, and a total of three sets of fire extinguishing agent injectors 52 and pressure sensors 62 in the circumferential direction from above the housing 31 When installed, more preferably, it is provided at an equal pitch angle (120°) apart.

Multiple tanks of fire extinguishing agent injectors 51 and pressure sensor 61 installed at the lower part, and multiple tanks of fire extinguishing agent injectors 52 and pressure reduction sensor 62 installed at the upper part alternate in the circumferential direction of housing 31 of mill 1 , that is, arranged in a zigzag pattern by aligning both the upper and lower rows.

In addition, in the above-described embodiment, each set of the fire extinguishing agent injector 51 and the pressure-sensitive sensor 61, or each set of the fire-extinguishing agent injector 52 and the pressure-sensitive sensor 62 is provided at a position spaced apart at an equal pitch angle in the circumferential direction, , an example of zigzag arrangement has been described, but the present invention is not limited to this example.

Under the influence of machines and mechanisms such as cranes, hoists, piping, and walking passages installed in the housing 31 of the mill 1 or installed around the mill 1, the extinguishing agent is applied at an equal pitch angle or zigzag shape. Each set of the injectors 51 and the pressure-sensitive sensor 61 and each set of the extinguishing agent injectors 52 and the pressure-sensitive sensor 62 may not be arranged. In the interior of the housing 31 of the mill 1, if the extinguishing agent can be dispersed relatively efficiently, for example, as shown in FIGS. 9 and 10, the extinguishing agent injector 51 and the pressure sensor 61 Each set, each set of the fire extinguishing agent injector 52 and the pressure-sensitive sensor 62 may not be arranged at an equal pitch angle or zigzag, but may be spaced apart from each other or adjacent to each other.

In addition, the number of installation of the fire extinguishing agent injectors 51 and 52 may increase or decrease depending on the volume of the space inside the housing 31 of the mill 1, and the number of installations of the pressure-sensitive sensors 61 and 62 does not match. In some cases. For this reason, it is not necessarily required that the pressure sensitive sensor 61 and the fire extinguishing agent injector 51 become a pair, and/or that the pressure sensitive sensor 62 and the extinguishing agent injector 52 become a pair.

Even when each is not a pair, preferably, the pressure-sensitive sensor 61 and the pressure-sensitive sensor 62 are alternately arranged up and down inside the housing 31, that is, in a zigzag shape, and the extinguishing agent injector 51 And the fire extinguishing agent injector 52 may be alternately arranged up and down inside the housing 31, that is, in a zigzag shape.

The feeder 6 serving as the raw material supply system is provided with a fire extinguishing agent injector 53 and a pressure reduction sensor 63 . The extinguishing agent injector 53 injects the extinguishing agent into the feeder 6 . The pressure-sensitive sensor 63 detects a pressure change inside the feeder 6 . Thereby, the rapid combustion which uses the biomass fuel which exists in the feeder 6 as a generation|occurrence|production origin can be suppressed. The biomass fuel stored in a large amount in the bunker 7 rises in temperature, becomes a state where only smoke is emitted (so-called embers), and falls on the belt feeder 8 of the feeder 6 as it is, and when in contact with air, rapid combustion occurs Since there is a possibility of becoming a source of the fire extinguishing agent injector 53 and pressure-sensitive sensor 63 is preferably provided in the feeder (6). In addition, the fire extinguishing agent injector 53 provided in the feeder 6 can suppress combustion due to rapid combustion generated and propagated within the housing 31 .

The extinguishing agent injector 54 is provided on the current side and/or on the downstream side of the rotary feeder 43 installed in the coal feed pipe 4 , and injects the extinguishing agent into the inside of the coal feed pipe 4 or the inside of the rotary feeder 43 . . The flame generated in the housing 31 by rapid combustion burns the center chute 33, and there exists a possibility that it may burn in the biomass fuel stored in the rotary feeder 43. Moreover, the flame which generate|occur|produced in the feeder 6 by rapid combustion may flow down the feeder 6, and there exists a possibility of being burned by the biomass fuel stored in the rotary feeder 43. When the extinguishing agent is injected into the inside of the coal feed pipe 4 or the inside of the rotary feeder 43 , it is possible to suppress combustion due to rapid combustion occurring inside the housing 31 or inside the feeder 6 .

The fire extinguishing agent injector 55 is provided in the trough 9 which is a pulverized material conveyance system, and injects a fire extinguishing agent into the trajectory 9. As shown in FIG. Since air flows toward the boiler facility 10 in the coal feed tube 9 , there is a fear that the flame generated in the housing 31 due to rapid combustion may flow down the inside of the coal feed tube 9 . By injecting the extinguishing agent into the trajectory 9, it is possible to suppress combustion due to rapid combustion generated and propagated in the housing 31.

The pressure-sensitive sensors 61 , 62 , 63 detect a pressure rise when the biomass fuel ignites in the mill 1 or in the feeder 6 and rapid combustion occurs. Signals related to the pressure values detected by the pressure-sensitive sensors 61, 62, and 63 are transmitted to a control unit (not shown). In the control unit, based on the pressure values detected by the pressure sensors 61 , 62 , 63 (according to whether the detected pressure value exceeds a predetermined threshold or more), it is determined whether rapid combustion has occurred, and the determination is made. Based on the result, the operation of the fire extinguishing agent injectors 51 to 55 is controlled.

When the three pressure-sensitive sensors 61 provided in the vicinity of the lower crushing unit 1A or the three pressure-sensitive sensors 62 provided in the vicinity of the upper classifying unit 1B exceed a predetermined threshold, the control unit rapidly It is judged that the abnormal pressure by combustion generation has generate|occur|produced, and it is judged that rapid combustion has generate|occur|produced. In this case, in all of the six fire extinguishing agent injectors 51 to 55, injection of the extinguishing agent is performed simultaneously and simultaneously. That is, the extinguishing agent is injected from all the extinguishing agent injectors 51 to 55 as well as the extinguishing agent injectors 51 and 52 adjacent to the pressure-sensitive sensors 61 and 62 that have exceeded a predetermined threshold. As a result, a change in pressure is detected in the housing 31 of the mill 1, which is highly likely to be the cause of the occurrence, thereby avoiding a timing shift and avoiding a so-called time lapse. Rapid combustion can be suppressed almost simultaneously with the occurrence of In addition, since the extinguishing agent is sprayed not only as the cause of the occurrence of rapid combustion, but also at a place where rapid combustion tends to propagate, it is possible to reduce enormous damage to the mill 1 . In addition, in this embodiment, it is not necessarily necessary to spray the extinguishing agent in all of the six extinguishing agent injectors 51 to 55, You may make it inject an extinguishing agent in at least the extinguishing agent injectors 51 and 52 provided in the mill 1. .

When the pressure-sensitive sensor 63 provided in the feeder 6 exceeds a predetermined threshold, the control unit determines that an abnormal pressure due to rapid combustion has occurred, and determines that rapid combustion has occurred. In this case, in all of the six fire extinguishing agent injectors 51 to 55, injection of the extinguishing agent is performed simultaneously and simultaneously. Thereby, since a change in pressure is detected by the feeder 6 which is highly likely to be the cause of the occurrence, the shift in timing is avoided, and so-called punctuality is not missed, so that it is almost simultaneously with the occurrence of rapid combustion. Rapid combustion can be suppressed. In addition, since the extinguishing agent is sprayed not only as the cause of the occurrence of rapid combustion, but also at a place where rapid combustion tends to propagate, it is possible to reduce enormous damage to the mill 1 . In addition, in this embodiment, it is not necessarily necessary to spray a fire extinguishing agent in all of the six fire extinguishing agent injectors 51-55, You may make it inject an extinguishing agent in at least the extinguishing agent injector 53 provided in the feeder 6 .

In addition, in embodiment mentioned above, when the pressure-sensitive sensors 61, 62, 63 exceeded a predetermined threshold value, although the example which judged that rapid combustion generate|occur|produced was demonstrated, this invention is not limited to this example. For example, the predetermined threshold value is a pressure value immediately before rapid combustion occurs, and when the pressure-sensitive sensors 61 , 62 , 63 exceed the predetermined threshold value, it is determined that rapid combustion is immediately before occurrence, and the extinguishing agent is may be sprayed. In this case, although rapid combustion may not occur due to continuation of operation, the occurrence of rapid combustion can be prevented in advance by detection of an abnormal pressure.

When the fire extinguishing agent is sprayed by the fire extinguishing agent injectors 51 to 55, the control unit stops the operation of the mill 1 instantaneously. The mill 1 is stopped in operation, primary air supply stop, biomass fuel supply stop, grinding rotary table 35 operation stop, rotary classifier 41 operation stop, fine pulverized material conveyance stop, etc. Both the case where all the mills 1 and the machines related to the mill equipment are stopped, and the case where only a part of it is stopped is conceivable.

The control unit is configured of, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and a computer-readable storage medium. A series of processing for realizing various functions is stored in a storage medium or the like in the form of a program as an example, and the CPU reads the program into RAM or the like and executes information processing and arithmetic processing, whereby various functions are implemented. come true Also, the program may be applied in the form of being installed in advance in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or delivered through a communication means by wire or wireless, etc. . The computer-readable storage medium is a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

<action effect>

According to this embodiment, the following effects are exhibited.

As described above, the pressure-sensitive sensors 61 , 62 , 63 for detecting abnormal pressure are provided in places where there is a possibility of becoming an ignition source of rapid combustion, and an ignition source and a place where rapid combustion is likely to propagate. The fire extinguishing agent injectors (51, 52, 53, 54, 55) are provided. According to this embodiment, not only the mill 1, but also the raw material supply system and the fine pulverized material discharge system of the mill facility, from generation of rapid combustion to flame propagation can be suppressed or prevented as a whole.

In recent years, in thermal power plants, lignocellulosic biomass fuel is used as a raw material (fuel), and also in large-scale thermal power plants, biomass fuel is used alone or examination of use is made. Therefore, the necessity of pulverizing the lignocellulosic biomass fuel is high even in the large mill 1, and the advanced technique is calculated|required about suppression from generation|occurrence|production of rapid combustion to flame propagation. According to this embodiment, it becomes possible to comply with these requests as well.

In addition, by the above effect, it is possible to safely maintain the mill 1 itself or the machinery and instruments attached to the mill 1 , and the safety of workers such as a power plant in which the mill 1 is installed is secured. Moreover, by the said effect, the kind of fuel which can be used in the mill 1 or a thermal power plant is expanded. Accordingly, the operation range of the thermal power plant is greatly expanded, and economic effects can be expected.

Moreover, since the structure of the fire extinguishing system installation which concerns on this embodiment installed in the mill 1 or a mill installation is simple, it is applicable not only to a new plant but to the existing mill 1 and mill installation.

<Modified example>

Hereinafter, a modified example of this embodiment is demonstrated.

Although the said embodiment demonstrated the mill 1 to which pellet-form lignocellulosic biomass fuel is supplied, grind|pulverized, and discharged|emitted which is easy to generate|occur|produce rapid combustion, this invention is not limited to the above-mentioned example. The present invention can also be applied to, for example, a mill for pulverizing non-woody biomass fuels such as dehydrated sludge, sub-bituminous coal or lignite coal with a large amount of volatile matter, or a fuel in which these are mixed.

In addition, the mill 1 to which this embodiment is applicable is not limited to the model of the above-mentioned embodiment, A mill of another type may be sufficient. For example, it is applicable to a mill in which the inner wall 45 is not provided and the annular flow path 46 between the inner wall 45 and the inner surface of the housing 31 is not formed. In this case, as shown in FIGS. 7 and 8, the extinguishing agent injector 51 and the pressure sensor 61 are located at the lower side of the housing 31 of the mill 1, and the crushing part ( 1A) In the vicinity, for example, in the height direction of the mill 1, the point provided between the grinding roller 36 and the pressure arm 37 is the same. However, the front end of the fire extinguishing agent injector 51 is provided in the housing 31 .

Also in the case of this type|mold, the potential which rapid combustion generate|occur|produces is high in the vicinity of 1 A of crushing parts. And by injecting the extinguishing agent into the vicinity of the crushing unit 1A, it is possible to suppress rapid combustion having the vicinity of the crushing unit 1A as a generation source and combustion due to propagated rapid combustion.

In addition, in the above-mentioned embodiment, the structure in which the bracket 38 is supported by the pressure arm 37, and the grinding|pulverization roller 36 is rockable with respect to the pressure arm 37 by the bracket 38 is demonstrated. However, the present invention is not limited to this example. For example, it may have a structure in which the grinding|pulverization roller is supported so that the pressure arm 37 or the bracket 38 is not provided, but the support material provided directly with respect to the housing 31 in a cantilever type.

1: wheat
1A: crushing part
1B: Classification Department
3: Boiler body
4: coal feeder
5: Silos
6: Feeder
7: Bunker
8: Belt Feeder
9: Songtan Hall
10: Boiler equipment
11: Burner
13: primary air duct
15: primary air fan
17: exhaust gas recirculation fan
19: denitration device
21: air preheater
23: electrostatic precipitator
25: Manned fan
27: desulfurization device
29: chimney
31: housing
32: ceiling
33: center suit
34: trestle
35: grinding rotary table
36: grinding roller
37: pressurized arm
38: bracket
39: tension rod
40: tension load box
41: rotary classifier
42: pin
43: rotary feeder
44: throat vane
45: inner wall
46: Fantasy Euro
51, 52, 53, 54, 55: fire extinguisher sprayer
56, 57: pipe member
60: primary air
61, 62, 63: pressure-sensitive sensor
66: through hole

Claims (8)

housing and
a fuel supply pipe connected to the ceiling of the housing and supplying fuel to the inside of the housing;
The fuel supplied from the fuel supply pipe is guided to the upper surface, and a rotary table that rotates about a central axis and is disposed opposite the rotary table and rotates, and pulverizes the fuel between the upper surfaces of the rotary table to pulverize the product A crushing unit having a crushing roller to produce
an air supply pipe connected to the lower part of the housing and supplying air to the inside of the housing;
a classifying part installed on the upper part of the housing to classify the pulverized material wound up by the air guided from the air supply pipe;
a pulverized material delivery pipe connected to the ceiling portion of the housing and guiding the pulverized material classified by the classifying unit to the outside;
a plurality of first pressure detection units provided in the vicinity of the crushing unit to detect pressure inside the housing;
a plurality of second pressure detection units provided in the vicinity of the classifying unit to detect pressure inside the housing;
It is installed in the vicinity of the pulverization unit on the side surface of the housing, and when it is determined based on the pressure detected by the first pressure detecting unit or the second pressure detecting unit that rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion , a first fire extinguishing agent spraying unit for spraying a fire extinguishing agent with respect to the crushing unit;
It is installed in the vicinity of the classification unit, and when it is determined based on the pressure detected by the first pressure detection unit or the second pressure detection unit that rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion, the classification unit a second fire extinguishing agent spraying unit that sprays a fire extinguishing agent against the
a rotary feeder installed in the fuel supply pipe and supplying the fuel for each predetermined amount;
It is installed on at least one of a current side and a downstream side of the rotary feeder installed in the fuel supply pipe, and based on the pressure detected by the first pressure detection unit or the second pressure detection unit, rapid combustion of the fuel occurs or rapid combustion a fourth fire extinguishing agent injecting unit that injects a fire extinguishing agent into the fuel supply pipe when it is determined that it is immediately before the occurrence of
In the inside of the housing, a wall member which is a cylindrical member extended between the crushing roller and the classifying unit is installed.
provided,
Between the wall material and the housing, an annular flow path is formed in which the pulverized material is wound up together with the air,
A pulverizer in which the first fire extinguishing agent spraying unit injects the fire extinguishing agent into a space inside the wall material. According to claim 1, wherein the supply unit provided on the upstream side of the fuel supply pipe for supplying the fuel to the fuel supply pipe;
a third pressure detecting unit installed in the feeder to detect the pressure inside the feeder;
A third fire extinguishing agent injection unit installed in the feeder and injecting an extinguishing agent to the feeder when it is determined that rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion based on the pressure detected by the third pressure detecting unit
The grinder further equipped. delete delete According to claim 1 or 2, which is installed in the pulverized material delivery pipe, based on the pressure detected by the first pressure detection unit or the second pressure detection unit, rapid combustion of the fuel occurs or rapid combustion The pulverizer further comprising a fifth fire extinguishing agent spraying unit that sprays the fire extinguishing agent to the pulverized material delivery pipe when it is determined that it is just before the occurrence. The method according to claim 1 or 2, wherein a plurality of the first pressure detection units and a plurality of the second pressure detection units are arranged in a zigzag shape on the upper and lower sides of the inside of the housing,
A pulverizer in which a plurality of the first fire extinguishing agent spraying units and a plurality of the second fire extinguishing agent spraying units are disposed in a zigzag pattern on the upper and lower sides of the inside of the housing. The method according to claim 5, wherein the plurality of first pressure detecting units and the plurality of second pressure detecting units are arranged in a zigzag shape on the upper and lower sides of the inside of the housing,
A pulverizer in which a plurality of the first fire extinguishing agent spraying units and a plurality of the second fire extinguishing agent spraying units are disposed in a zigzag pattern on the upper and lower sides of the inside of the housing. housing and
a fuel supply pipe connected to the ceiling of the housing and supplying fuel to the inside of the housing;
The fuel supplied from the fuel supply pipe is guided to the upper surface, and a rotary table that rotates about a central axis and is disposed opposite the rotary table and rotates, and pulverizes the fuel between the upper surfaces of the rotary table to pulverize the product A crushing unit having a crushing roller to produce
an air supply pipe connected to the lower part of the housing and supplying air to the inside of the housing;
a classifying part installed on the upper part of the housing to classify the pulverized material wound up by the air guided from the air supply pipe;
a pulverized material delivery pipe connected to the ceiling portion of the housing and guiding the pulverized material classified by the classifying unit to the outside;
a wall member which is a cylindrical member extended between the crushing roller and the classifying part in the inside of the housing;
A rotary feeder that is installed in the fuel supply pipe and supplies the fuel for each predetermined amount.
provided,
Between the wall material and the housing, it is a method of operating a pulverizer in which an annular flow path is formed in which the finely pulverized material is wound up together with the air,
A plurality of first pressure detection units provided in the vicinity of the crushing unit detect the internal pressure of the housing,
A plurality of second pressure detection units provided in the vicinity of the classifying unit detect the internal pressure of the housing,
When it is determined on the basis of the pressure detected by the first pressure detection unit or the second pressure detection unit that the rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion, the second pressure detection unit provided in the vicinity of the crushing unit on the side surface of the housing 1 The extinguishing agent spraying unit sprays the extinguishing agent with respect to the pulverizing unit,
When it is determined based on the pressure detected by the first pressure detection unit or the second pressure detection unit that rapid combustion of the fuel has occurred or is immediately before the occurrence of rapid combustion, a second fire extinguishing agent injection unit installed in the vicinity of the classification unit, Spraying the extinguishing agent with respect to the classification unit,
On the basis of the pressure detected by the first pressure detection unit or the second pressure detection unit, when it is determined that the rapid combustion of the fuel has occurred or is immediately before the occurrence of the rapid combustion, the current side and the wake of the rotary feeder installed in the fuel supply pipe A fourth fire extinguishing agent injection unit installed on at least one of the sides injects the fire extinguishing agent into the fuel supply pipe,
An operating method of a pulverizer in which the first fire extinguishing agent spraying unit sprays the fire extinguishing agent into a space inside the wall material.

Images