JP4276247B2 - Boiler equipment - Google Patents

Description

  The present invention relates to a boiler apparatus that burns a solid fuel made of various fuel products such as wood and coal, as well as waste such as wood, paper, and plastic, and generates hot water or steam by the heat of combustion.

Conventionally, as this type of boiler device, for example, as shown in FIG. 13, a gasification boiler device is known in which gas generated by dry distillation of solid fuel is burned in a combustion chamber (for example, JP 2003-139212 A).
This includes a primary combustion chamber 200 that has an openable and closable inlet (not shown) for charging solid fuel and burns the charged solid fuel, and the primary combustion chamber 200 via a communication passage 201 on the upper side thereof. A secondary combustion chamber 202 for combusting combustion gas from the primary combustion chamber 200, a tertiary combustion chamber 203 for combusting unburned gas that has passed through the secondary combustion chamber 202, and the tertiary combustion chamber 203. A chimney 204 for exhausting the generated exhaust gas, a burner 205 capable of combusting the combustion gas in the secondary combustion chamber 202, a burner 206 capable of combusting the combustion gas in the tertiary combustion chamber 203, and air blowing out of the primary combustion chamber 200 A blower 208 that supplies air to the pipe 207 is provided. And the furnace wall which comprises each combustion chamber 200,202,203 is comprised with an interior board and an exterior board, the space 210 between this interior board and an exterior board is filled with water, and this filled water is filled. Heating is performed in each of the combustion chambers 200, 202, 203 and circulated in the external pipe 211, and heat can be taken out in the external pipe 211.

  In this conventional boiler apparatus, when solid fuel is introduced into the primary combustion chamber 200 from the inlet and ignited, and external air is supplied from the blower 208 through the air blowing pipe 207 into the primary combustion chamber 200, the solid fuel is combusted. The unburned gas generated in the primary combustion chamber 200 gradually flows into the secondary combustion chamber 202 and is burned by the flame injected from the burner 205. Further, the unburned gas that could not be processed in the secondary combustion chamber 202 further flows into the upper tertiary combustion chamber 203 where it is burned by the flame injected from the burner 206.

JP 2003-139212 A

  By the way, in the conventional boiler apparatus, air is supplied from the blower 208 to the air blowing pipe 207 of the primary combustion chamber 200 and is once gasified in the primary combustion chamber 200, and then the secondary combustion chamber 201 and the tertiary combustion. Although unburned gas is burned by the burners 205 and 206 in the chamber 203, air is uniformly blown out from the air blowing pipe 207. For example, in a solid fuel with relatively low heat generation energy such as wood and paper. Combustion may become unstable due to excessive combustion, etc., and these combustion gases are also burned by the burners 205 and 206 one by one, so that the external energy becomes large and wasteful and the combustion efficiency is poor. There was a problem.

  The present invention has been made in view of the above-described problems. The air supply mode can be changed variously in accordance with the combustion state of the solid fuel, the solid fuel can be stably burned, and the burner An object of the present invention is to provide a boiler device that reduces the degree of dependence as much as possible to improve combustion efficiency.

In order to achieve such an object, the boiler apparatus of the present invention includes a primary combustion tower having a primary combustion chamber for burning solid fuel, a fuel supply unit for supplying solid fuel to the primary combustion chamber of the primary combustion tower, A blower for supplying air to the primary combustion chamber of the primary combustion tower, and secondary combustion for communicating combustion gas from the primary combustion chamber in communication with the primary combustion chamber of the primary combustion tower via a communication passage on the upper side thereof A secondary combustion tower having a chamber, a burner provided in the secondary combustion tower and capable of burning the combustion gas in the secondary combustion chamber, a water tank containing water, and the secondary combustion tower built in the water tank In a boiler apparatus comprising a heat exchanger that has a smoke pipe through which exhaust gas from the exhaust gas passes and that performs heat exchange between the exhaust gas passing through the smoke pipe and water,
The primary combustion tower is provided with a lower air supply part for supplying air to the lower side of the primary combustion chamber and an upper air supply part for supplying air to the upper side of the primary combustion chamber, and the lower air supply part A lower air feed pipe for feeding air from the blower to the upper air supply pipe, an upper air feed pipe for feeding air from the blower to the upper air supply section, and the lower air feed pipe A lower damper is provided to adjust the opening of the lower air supply pipe to make the air supply amount variable, and the opening of the upper air supply pipe is adjusted to adjust the amount of air in the upper air supply pipe. The upper damper is provided to make the feed amount variable.

  Thereby, in the primary combustion chamber, the amount of air can be adjusted up and down by adjusting the opening degree of the lower damper and the upper damper, and accordingly, various air supply modes can be used depending on the solid fuel combustion condition. Therefore, the solid fuel can be stably burned, and the degree of dependence of the burner can be reduced as much as the combustion is stabilized, so that the combustion efficiency can be improved.

  For example, in the case of burning a solid fuel having a relatively low heat generation energy (calorie calorie) such as wood, paper, cardboard or waste, for example, the upper damper of the upper air supply pipe is appropriately opened, and the burner is first opened. The secondary combustion chamber is heated to operate, and when the temperature of the secondary combustion chamber reaches an appropriate temperature, the solid fuel in the primary combustion tower is ignited. Then, the blower is started, air is sent into the primary combustion chamber, and the opening amount of the lower air supply pipe is varied by the lower damper to adjust the air supply amount. In this case, air is supplied from the upper air supply unit, and air whose amount is adjusted by the lower damper is supplied from the lower air supply unit. Therefore, the solid fuel in the primary combustion chamber becomes a combustion with less unburned gas, a flame is generated in the primary combustion chamber, and the solid fuel is almost burned in the primary combustion chamber. Therefore, if combustion is stabilized in the primary combustion chamber, the burner can be stopped. As a result, the air supply mode can be changed in various ways according to the state of solid fuel combustion, stable solid fuel combustion can be performed, and burner dependence is reduced as much as possible to improve combustion efficiency. Can be achieved.

  Further, according to the present apparatus, it is possible to cope with a solid fuel having a relatively high heat generation energy (heat generation calorie) such as plastic, rubber, and tire. In this case, for example, the upper damper of the upper air supply pipe is shut off, and in this state, for example, the burner is operated first to heat the secondary combustion chamber, and the temperature of the secondary combustion chamber becomes an appropriate temperature. After that, the solid fuel in the primary combustion tower is ignited. Then, the blower is started, air is sent into the primary combustion chamber, and the opening amount of the lower air supply pipe is varied by the lower damper to adjust the air supply amount. In this case, the blowing of air is blocked from the air outlet of the upper air supply unit, and only the air whose amount is adjusted by the lower damper is blown out from the lower air supply unit. Therefore, the solid fuel in the primary combustion chamber becomes an unburned gas and flows into the secondary combustion chamber, so that the unburned gas can be burned in the secondary combustion chamber. If combustion in the secondary combustion chamber is stable, the burner can be stopped. As a result, the air supply mode can be changed in various ways according to the state of solid fuel combustion, stable solid fuel combustion can be performed, and burner dependence is reduced as much as possible to improve combustion efficiency. Can be achieved.

  And, if necessary, the primary combustion tower is configured to include an inner wall that is made of a refractory member and forms a primary combustion chamber therein, and an outer wall that surrounds the inner wall with a space therebetween, and the primary wall is surrounded around the inner wall. A plurality of air outlets communicating with the combustion chamber are provided, and the inner wall and the outer wall are partitioned into a lower air chamber and an upper air chamber via a partition, and the lower air chamber is located below the primary combustion chamber. The upper air chamber is configured as an upper air supply unit that supplies air to the upper side of the primary combustion chamber. Air can be supplied from a plurality of air outlets, and since the degree of air supply can be changed between the upper side and the lower side, the air supply mode can be variously changed according to the combustion state of the solid fuel, It is possible to more stably burn the solid fuel. In addition, air supply corresponding to the difference in heat generation energy (heat generation calories) of the solid fuel can be performed.

  Further, if necessary, based on the combustion sensor for detecting the temperature of the secondary combustion chamber, the water temperature sensor for detecting the temperature of the water in the heat exchange unit, and the detected temperature of the combustion sensor and / or the water temperature sensor. And a control unit that controls combustion in the primary and secondary combustion chambers. Thereby, the combustion control by the control unit is performed in accordance with the combustion state of the secondary combustion chamber and the water temperature of the heat exchange unit, so that more stable solid fuel combustion can be performed.

In this case, based on the detected temperature of the combustion sensor and / or the water temperature sensor, the control unit performs on / off control of the burner based on the detected temperature of the combustion sensor and / or the water temperature sensor. It is effective to include damper control means for controlling the opening degree of at least one of the lower damper and the upper damper. Since the burner and the damper are controlled, stable solid fuel combustion can be performed reliably.
Further, in this case, the burner control means of the control unit turns on the burner when the temperature detected by the combustion sensor is lower than a preset set temperature, and the temperature detected by the combustion sensor is equal to or higher than the preset set temperature. Sometimes it is effective to have a function to turn off the burner.

  Further, if necessary, the control unit is provided with fuel control means for controlling the amount of solid fuel supplied by the fuel supply unit based on the temperature detected by the combustion sensor and / or the water temperature sensor. . Thereby, since the supply amount of the solid fuel is controlled in addition to the control of the burner and the damper, the solid fuel can be more reliably burned more reliably.

  Furthermore, if necessary, the temperature detected by the combustion sensor is preset in the control unit and corresponds to a temperature range lower than the second set temperature when the temperature is higher than the set temperature and lower than the second set temperature. The combustion acceleration mode for promoting combustion by controlling the damper control means and the fuel control means, and the temperature detected by the combustion sensor is preset and the first temperature is higher than the second set temperature that is higher than the set temperature. It is configured to include a mode setting means for setting any one of the combustion suppression modes for suppressing combustion by performing control by the damper control means and the fuel control means corresponding to a temperature range equal to or higher than two set temperatures. . According to this, it is divided into the combustion promotion mode and the combustion suppression mode, and the damper opening degree control and the solid fuel supply amount control are individually performed in each mode, so that the combustion condition of the solid fuel can be dealt with more finely. Combustion control can be performed, and solid fuel combustion can be performed more stably.

More specifically, the lower air supply pipe is provided with a lower damper whose opening degree is adjusted to vary the air supply amount of the lower air supply pipe, and the upper air supply pipe A manual upper damper that adjusts the opening of the upper air supply pipe to make the air supply amount variable, a combustion sensor that detects the temperature of the secondary combustion chamber, and water in the heat exchange unit A water temperature sensor for detecting the temperature, and a control unit for controlling combustion in the primary and secondary combustion chambers based on the detected temperature of the combustion sensor and / or the water temperature sensor,
Burner control for turning on the burner when the temperature detected by the combustion sensor is lower than a preset temperature set and turning off the burner when the temperature detected by the combustion sensor is equal to or higher than a preset temperature means and, the temperature and the damper control means for control of the opening degree of the lower damper based on the detected temperature of the sensor, the combustion sensor and / or solid fuel supplied by the fuel supply section based on the temperature detected by the water temperature sensor The fuel control means for controlling the supply amount of the fuel and the temperature corresponding to the temperature range below the second set temperature when the temperature detected by the combustion sensor is preset and lower than the second set temperature higher than the set temperature A combustion acceleration mode for promoting combustion by controlling the damper control means and the fuel control means and the temperature detected by the combustion sensor are preset and set Any of the combustion suppression modes for suppressing combustion by controlling the damper control means and the fuel control means corresponding to the temperature range above the second set temperature when the temperature is higher than the second set temperature. it is configured to include a mode setting means for setting the mode.

  And, if necessary, in the combustion promotion mode, the control of the damper control means is defined in a range of 0 to 100% of the opening degree of the lower damper, and the control of the fuel control means is controlled by the fuel supply unit. In the combustion suppression mode, the control of the damper control means is specified in the range of 0 to 50% of the opening of the lower damper, and the fuel control means Control is defined in the range of 0 to 50% of the fuel supply capacity of the fuel supply unit. Since the control is divided on the basis of 50% of the driving capacity, the setting becomes easy without complication.

  If necessary, in the combustion promotion mode and the combustion suppression mode, when the temperature detected by the water temperature sensor is lower than a preset temperature, the damper control means sets the opening degree of the lower damper by the water temperature sensor. The fuel control means performs fuel supply in proportion to the temperature detected by the water temperature sensor, and when the temperature detected by the water temperature sensor is equal to or higher than a preset temperature, The damper control means controls the opening degree of the lower damper in proportion or controls it to be constant, and the fuel control means performs fuel supply in proportion or constant to the temperature detected by the water temperature sensor. Yes. In each mode, that is, in the combustion promotion mode, control in proportion to the temperature detected by the water temperature sensor is performed in the range of 0 to 100% of the capacity, and in the combustion suppression mode, the water temperature sensor is controlled in the range of 0 to 50% of the capacity. Since the control corresponding to the detected temperature is performed, the combustion control can be performed in more detail corresponding to the solid fuel combustion state, and the solid fuel can be burned more stably.

And if necessary, it is set as the structure which piped the secondary combustion air supply pipe which supplies the air from an air blower to the upper part of the said secondary combustion chamber. Secondary combustion can be performed reliably.
In this case, the secondary combustion chamber is provided with an exhaust pipe for supplying exhaust gas to the smoke pipe, and the lower end of the exhaust pipe is provided so as to protrude from the upper center of the secondary combustion chamber. The outlet is opened to a position eccentric from the position toward the upper center of the secondary combustion chamber, and a cyclone function is provided in which the combustion gas from the outlet of the communication passage is swirled and burned at the upper portion of the secondary combustion chamber, An air outlet for providing a swirling flow of air in the same direction as the combustion gas is provided at the upper part of the secondary combustion chamber, and a secondary combustion air supply pipe for supplying air from the blower is connected to the air outlet. Is effective. Since the cyclone function is provided, ash can be dropped under the secondary combustion chamber, and clean exhaust gas can be exhausted.

  In addition, if necessary, the primary combustion tower is provided with a receiving port that opens below the primary combustion chamber and receives a fine solid fuel, and the fuel supply unit temporarily stores the solid fuel. A hopper and a screw conveyor that conveys the solid fuel from the hopper to the primary combustion chamber through the receiving port and that can control the conveyance speed by the control unit and adjust the supply amount of the solid fuel are provided. The supply amount of fuel can be reliably controlled by the screw conveyor.

  Furthermore, if necessary, the primary combustion tower is provided with a receiving port that opens below the primary combustion chamber and receives a thin solid fuel, and the fuel supply unit is a storage tank that stores the solid fuel. A variable speed screw conveyor that conveys the solid fuel from the storage tank and is capable of adjusting the supply amount of the solid fuel by controlling the conveyance speed by the control unit; and receiving the solid fuel conveyed by the variable speed screw conveyor A hopper that temporarily stores and a screw conveyor that has a constant conveying speed for conveying the solid fuel in the hopper to the primary combustion chamber through the receiving port of the primary combustion tower are provided. Since the supply amount of fuel can be reliably controlled by the variable speed screw conveyor and is transferred to the hopper, clogging is prevented in the solid fuel conveyance path.

  In this case, it is effective to provide the storage tank above the hopper, provide a shooter between the outlet of the variable speed screw conveyor and the hopper, and provide an interval between the outlet of the shooter and the hopper. is there. Since the interval is set, clogging of the solid fuel is surely prevented.

  Furthermore, it is set as the structure which provided the stirring apparatus which stirs a solid fuel in the said storage tank as needed. As a result, a situation in which a cavity is formed in the upper portion of the screw conveyor is prevented in the storage tank, and the solid fuel is transported in a stable contact with the screw conveyor.

  Furthermore, if necessary, the storage tank is provided with a replenishing device for replenishing the solid fuel, and the replenishing device stores the suction blower for sucking the solid fuel and the solid fuel sucked by the suction blower. And a hose to be introduced into the tank. Solid fuel can be easily replenished.

  According to the boiler device of the present invention, in the primary combustion chamber, the amount of air can be adjusted up and down by adjusting the opening between the lower damper and the upper damper, and accordingly, according to the solid fuel combustion condition The air supply mode can be changed in various ways, stable solid fuel combustion can be performed, and the degree of dependence of the burner can be reduced as much as the combustion is stabilized, thereby improving the combustion efficiency. be able to.

  Further, according to the boiler device of the present invention, for example, when incinerating a solid fuel having a relatively low heat generation energy (calorie calorie) such as wood, paper, cardboard or waste, the upper damper of the upper air supply pipe is appropriately used. When setting the open position and incinerating solid fuel with relatively high exothermic energy (calorie calorie) such as plastic, rubber, tires, etc., the upper damper of the upper air supply pipe is set to the cutoff position to cause combustion. it can. By controlling in this way, it becomes possible to switch between so-called upper flame combustion and gasification combustion with a single device, and a combustion mode corresponding to the difference in heat generation energy (heat generation calories) of solid fuel. Therefore, combustion efficiency can be improved, carbon generation can be suppressed and burned reliably, clinker can be reduced, and equipment maintenance is easy and durable. Can also be improved.

Hereinafter, a combustion apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIGS. 1 to 6, the boiler device according to the embodiment of the present invention is a relatively small device that burns solid fuel and generates hot water by its combustion heat. The boiler apparatus which concerns on embodiment is obtained by grind | pulverizing the construction waste material etc. of wood as the solid fuel W, and burns the mixture of fine wood, such as a granular form, a chip form, and a fiber form.

  The basic configuration of the boiler apparatus according to the embodiment includes a primary combustion tower Ta having a primary combustion chamber 1 for burning solid fuel W, and a fuel supply for supplying the solid fuel W to the primary combustion chamber 1 of the primary combustion tower Ta. And a secondary combustion tower Tb having a secondary combustion chamber 50 that communicates with the primary combustion chamber 1 via the communication passage 3 on the upper side thereof, and combusts the combustion gas from the primary combustion chamber 1. And a water tank 71 containing water and a smoke pipe 72 which is built in the water tank 71 and through which the exhaust gas from the secondary combustion tower Tb is passed, and heat exchange is performed between the exhaust gas passing through the smoke pipe 72 and the water. The heat exchange part 70 to perform is provided.

  As shown in FIG. 1 to FIG. 6 and FIG. 12, the primary combustion tower Ta includes a bottomed cylindrical inner wall 4 that is formed of a refractory member and forms a primary combustion chamber 1 inside, and an inner wall 4 spaced apart. A rectangular parallelepiped metal outer wall 5 is provided. For example, the inner wall 4 has a diameter of about 900 mm and a height of about 1500 mm. As shown in FIGS. 5 and 6, a plurality of air outlets 6 communicating with the primary combustion chamber 1 are provided in a matrix around the inner wall 4. A space between the inner wall 4 and the outer wall 5 is divided into a lower air chamber 8 and an upper air chamber 9 via an intermediate partition 7. The lower air chamber 8 is configured as a lower air supply unit 10 that supplies air to the lower side of the primary combustion chamber 1, and the upper air chamber 9 is upper air that supplies air to the upper side of the primary combustion chamber 1. The supply unit 11 is configured.

  Further, the primary combustion tower Ta is provided with a receiving port 15 that opens to the lower side of the primary combustion chamber 1 and receives the thin solid fuel W. The solid fuel W is transported by a constant speed screw conveyor 24 described later of the fuel supply unit 20 and supplied from the receiving port 15 to the bottom surface of the primary combustion chamber 1. The receiving port 15 is provided in a lower door 13 that opens and closes a lower opening 12 provided in a lower portion of the primary combustion chamber 1. The lower door 13 is opened, and the solid fuel W inside is ignited or ash is removed.

  Further, on the upper side of the primary combustion tower Ta, an openable / closable inlet portion 16 into which the solid fuel W can be introduced is provided. Reference numeral 17 denotes an opening / closing door. Combustion materials other than the solid fuel W can be introduced from the inlet 16 by opening the door 17. The open / close door 17 is provided with a peep window 18 covered with fireproof glass.

  As shown in FIG. 1, the fuel supply unit 20 transports the solid fuel W from the storage tank 21 that stores the solid fuel W, and the transport speed is controlled by the control unit 100 described later, and the solid fuel W is controlled. The variable speed screw conveyor 22 that can adjust the supply amount of the fuel, the hopper 23 that temporarily receives and stores the solid fuel W conveyed by the variable speed screw conveyor 22, and the solid combustion W in the hopper 23 as the primary combustion tower A screw conveyor 24 having a constant conveying speed for conveying the solid fuel W to the primary combustion chamber 1 through a receiving port 15 provided in Ta is configured. Two variable speed screw conveyors 22 are provided in parallel. In the figure, 25 is a motor for the variable speed screw conveyor 22, and 26 is a motor for the constant speed screw conveyor 24. When the lower door 13 is opened and closed, the variable speed screw conveyor 22 is disconnected from the receiving port 15.

The storage tank 21 is provided above the hopper 23, and a shooter 27 is provided between the outlet of the speed variable screw conveyor 22 and the hopper 23. An interval is provided between the outlet of the shooter 27 and the hopper 23 so that the falling solid fuel W is not clogged in the middle. Reference numeral 28 in the figure denotes a sensor that detects when clogged and solid fuel W has accumulated.
Furthermore, the storage tank 21 and the hopper 23 are provided with a sprinkler 29 for spraying water in an emergency.

  Furthermore, the storage tank 21 is provided with a stirring device 30 for stirring the solid fuel W in the storage tank 21. The stirring device 30 includes a plurality of rotating plates 32 that are provided on an upper portion of the variable speed screw conveyor 22 and are rotated by an electric motor 31. Each rotary disk 32 is provided with a plurality of protrusions 33 at equal intervals along the circumference thereof, and the solid fuel W is agitated by the protrusions 33. Thereby, in the storage tank 21, the situation where a cavity is formed in the upper part of the variable speed screw conveyor 22 is prevented, and the solid fuel W is conveyed stably in contact with the variable speed screw conveyor 22.

  In addition, a replenishing device 40 for replenishing the storage tank 21 with the solid fuel W is provided. The replenishing device 40 includes a suction blower 41 that sucks the solid fuel W and a hose 42 that introduces the solid fuel W sucked by the suction blower 41 into the storage tank 21. The solid fuel W is deposited, for example, in a storage field 43 provided in the vicinity of the storage tank 21. The storage tank 21 is provided with a level sensor 44 for monitoring the storage height of the solid fuel W. When the level sensor 44 is detected, the replenisher 40 is operated automatically or manually to store the solid fuel W. The storage tank 21 is replenished with the solid fuel W deposited in the field 43.

  As shown in FIGS. 1 to 4 and 12, the secondary combustion tower Tb surrounds the inner wall 51 with a bottomed cylindrical inner wall 51 that is formed of a refractory member and forms a secondary combustion chamber 50 therein. A metal outer wall 52 is provided. Further, a lower opening 53 for removing ash and the like is provided at the lower part of the secondary combustion chamber 50, and a lower door 54 that can be opened and closed via a hinge is provided in the lower opening 53.

  In addition, an exhaust / exhaust pipe 55 that supplies exhaust gas to the smoke pipe 72 of the heat exchange unit 70 is provided at the upper part of the secondary combustion chamber 50. A lower end 55a of the feed / exhaust pipe 55 is provided in the upper center of the secondary combustion chamber 50 so as to protrude downward through the ceiling. Further, the outlet 56 of the communication passage 3 is opened to a position eccentric from the position toward the upper center of the secondary combustion chamber 50, and the combustion gas from the outlet 56 of the communication passage 3 is swirled at the upper portion of the secondary combustion chamber 50. It is equipped with a cyclone function for burning.

  A kerosene burner 57 capable of burning the combustion gas in the secondary combustion chamber 50 is provided on the upper front side of the secondary combustion tower Tb. Kerosene to the kerosene burner 57 is supplied from a kerosene tank (not shown). The ejection port 59 of the kerosene burner 57 is opened at a position eccentric from the position toward the upper center of the secondary combustion chamber 50 so that the flame swirls in the direction in which the combustion gas from the outlet of the communication passage 3 swirls. Is provided.

  In addition, as shown in FIG. 1, a blower 60 that supplies air to the primary combustion chamber 1 and the secondary combustion chamber 50 is provided. The blower 60 is provided with a main feed pipe 61 that feeds air from the blower 60, and the main feed pipe 61 is connected with the air from the blower 60 to the lower air supply unit 10 of the primary combustion tower Ta. The lower air supply pipe 63 for supplying the air is piped, and the upper air supply pipe 64 for feeding the air from the blower 60 to the upper air supply section 11 of the primary combustion tower Ta is piped.

  Further, an air outlet 65 for providing a swirling flow of air in the same direction as the combustion gas is provided in the upper part of the secondary combustion chamber 50. A secondary combustion air feed pipe 66 that extends from the upper part of the main feed pipe 61 and feeds air from the blower 60 is piped to the air outlet 65. A viewing window (not shown) is provided at the end of the secondary combustion air feed pipe 66 on the main feed pipe 61 side, and the combustion state of the secondary combustion chamber 50 is changed through the secondary combustion air feed pipe 66. It is made visible.

Further, as shown in FIGS. 1 to 3, the heat exchanging unit 70 is installed on the upper side of the primary combustion tower Ta and the secondary combustion tower Tb. The heat exchanging unit 70 includes a water tank 71 in which water is accommodated, and a smoke pipe 72 through which the exhaust gas exhausted through the feed / exhaust pipe 55 from the secondary combustion tower Tb is provided. The heat exchange is performed between the exhaust gas passing through the smoke pipe 72 and water.
Specifically, a front chamber 73 and a rear chamber 74 that are separated by the outer wall of the water tank 71 and through which the exhaust gas passes are respectively provided before and after the water tank 71. A plurality of smoke pipes 72 are provided, and these smoke pipes 72 are installed between the front chamber 73 and the rear chamber 74 through the water tank 71 at a predetermined interval in a matrix. The delivery chamber 55 is connected to the front chamber 73, and a chimney 75 is connected to the rear chamber 74. In the middle of the chimney 75, an attracting fan 76 for promoting exhaust gas exhaust is provided. The water tank 71 is provided with a water supply port 77 for supplying new water into the water tank 71, and the water level is always kept constant by water supply from the water supply port 77.

  As shown in FIG. 7, the hot water generated in the water tank 71 of the heat exchange unit 70 is circulated in a circulation pipe 80 connected to an outlet 78 and an inlet 79 provided in the water tank 71. The circulation pipe 80 is provided in two systems in parallel, for example, and transfers heat to water flowing through the other pipes 83 and 84 via heat exchangers 81 and 82 provided in the middle of the path of each circulation pipe 80. For example, in a hot water pool facility, hot water from one system circulation pipe 80 (A) is used for heating pool water, and hot water from another system circulation pipe 80 (B) is used for body washing. It is used for heating of hot water.

Next, a control system of the boiler device according to the present embodiment will be described. As shown in FIGS. 1, 2, and 8, the upper air feed pipe 64 has a manual upper damper 90 whose opening degree is adjusted to vary the air feed amount of the upper air feed pipe. Is provided. On the other hand, the lower air supply pipe 63 is provided with an electrically driven lower damper 91 whose opening degree is adjusted and the amount of air supplied to the lower air supply pipe 63 is variable.
The secondary combustion tower Tb is provided with a thermocouple-type combustion sensor 93 that detects the temperature of the exhaust gas in the secondary combustion chamber 50, and the water tank 71 of the heat exchanging unit 70 has water in the water tank 71. A water temperature sensor 94 is provided for detecting the temperature of the water.

And combustion of the primary combustion chamber 1 and the secondary combustion chamber 50 is controlled by the control part 100 as shown in FIG.
The control unit 100 includes a burner control unit 101 that performs on / off control of the burner 57 based on the temperature detected by the combustion sensor 93 and / or the water temperature sensor 94 (in the embodiment, the combustion sensor 93), the combustion sensor 93, and / or Damper control means 102 that controls the opening degree of at least one of the lower damper 91 and the upper damper 90 (in the embodiment, the lower damper 91) based on the temperature detected by the water temperature sensor 94 is provided.

  The burner control means 101 of the control unit 100 turns on the burner 57 when the temperature detected by the combustion sensor 93 is lower than a preset first set temperature (800 ° C. in the embodiment), and the temperature detected by the combustion sensor 93 is A function is provided to turn off the burner 57 when the temperature is equal to or higher than a preset first set temperature (800 ° C. in the embodiment).

  Further, the control unit 100 is provided with fuel control means 103 that controls the supply amount of the solid fuel W supplied by the fuel supply unit 20 based on the temperature detected by the combustion sensor 93 and / or the water temperature sensor 94. Specifically, the number of revolutions of the electric motor 25 of the variable speed screw conveyor 22 is controlled to adjust the feed amount of the solid fuel W.

  Further, the temperature detected by the combustion sensor 93 is preset in the control unit 100 and is lower than the second set temperature (900 ° C. in the embodiment) higher than the first set temperature (800 ° C. in the embodiment). At this time, the combustion acceleration mode in which the control by the damper control means 102 and the fuel control means 103 corresponding to the temperature range lower than the second set temperature is performed to promote combustion, and the temperature detected by the combustion sensor 93 are set in advance. When the temperature is higher than the second set temperature (900 ° C. in the embodiment) higher than the first set temperature (800 ° C. in the embodiment), the damper control means corresponding to the temperature range higher than the second set temperature. A mode setting means 104 is provided for setting to any one of the combustion suppression modes for suppressing combustion by performing control by the fuel control means 102 and the fuel control means 103.

  Specifically, in the combustion promotion mode, the control of the damper control means 102 is defined in the range of 0 to 100% of the opening degree of the lower damper 91, and the control of the fuel control means 103 is the fuel supply of the fuel supply unit 20. It is specified in the range of 0 to 100% of the capacity. On the other hand, in the combustion suppression mode, the control of the damper control means 102 is defined in the range of 0 to 50% of the opening degree of the lower damper 91, and the control of the fuel control means 103 is the fuel supply capacity of the fuel supply unit 20. In the range of 0 to 50%.

In the combustion promotion mode and the combustion suppression mode, the damper control means 102 opens the lower damper 91 when the temperature detected by the water temperature sensor 94 is lower than a preset temperature (80 ° C. in the embodiment). The degree is controlled in proportion to the temperature detected by the water temperature sensor 94. In the embodiment, as shown in FIG. 9, the opening degree is decreased when the temperature is increased, and the opening degree is increased when the temperature is decreased. The fuel control means 103 supplies fuel in proportion to the temperature detected by the water temperature sensor 94. In the embodiment, the rotational speed of the screw conveyor 22 is decreased when the temperature is increased, and the rotational speed of the screw conveyor 22 is increased when the temperature is decreased.
On the other hand, when the temperature detected by the water temperature sensor 94 is equal to or higher than a preset temperature (80 ° C. in the embodiment), the damper control means 102 controls the opening degree of the lower damper 91 in proportion or controls it to be constant. To do. In the embodiment, as shown in FIG. 9, the opening degree of the lower damper 91 is controlled to be constant in a substantially closed state. The fuel control means 103 supplies fuel in proportion to or constant with the temperature detected by the water temperature sensor 94. In the embodiment, the rotational speed of the screw conveyor 22 is decreased when the temperature is increased, and the rotational speed of the screw conveyor 22 is increased when the temperature is decreased.

  The control panel (not shown) provided with the control unit 100 is provided with switches for starting and stopping the burner 57, the blower 60, the variable speed screw conveyor 22 and the constant speed screw conveyor 24 of the fuel supply unit 20. ing. Further, the control panel is provided with thermometers that allow visual observation of the temperatures of the primary combustion chamber 1, the secondary combustion chamber 50, and the water tank 71, and various pressure gauges (not shown) that indicate the pressure of the communication passage 3. The instrument is provided.

Therefore, when operating the boiler apparatus which concerns on this embodiment, it carries out as follows. This will be described with reference to the flowcharts shown in FIGS.
First, the opening degree of the upper damper 90 of the upper air supply pipe 64 is set appropriately in advance. As shown in FIG. 10, the burner 57 is started (1-1), and the secondary combustion chamber 50 is heated. By visually observing the thermometer on the control panel, when the temperature of the secondary combustion chamber 50 reaches about 400 ° C., the lower door 13 of the primary combustion tower Ta is opened and the solid fuel W is ignited. Then, the blower 60 is started, the solid fuel W is burned in the primary combustion chamber 1, and the fuel supply unit 20 is started.

In this state, as shown in FIG. 11, it is detected whether or not the detected temperature of the combustion sensor 93 reaches the second set temperature (900 ° C.) (S1), and the detected temperature of the combustion sensor 93 is the second detected temperature. Since the temperature is lower than the set temperature (900 ° C.), the mode setting means 104 sets the combustion acceleration mode (S2). In the combustion promotion mode, the control of the damper control means 102 is defined in the range of 0 to 100% of the opening degree of the lower damper 91, and the control of the fuel control means 103 is 0 of the fuel supply capacity of the fuel supply unit 20. It is specified in the range of ˜100% (S3). In this combustion promotion mode, the control unit 100 detects whether or not the temperature detected by the water temperature sensor 94 reaches a preset temperature (80 ° C.) (S4). Since the temperature is lower than the set temperature (80 ° C.) (S4NO), as shown in FIG. 9, the damper control means 102 opens and closes the opening degree of the lower damper 91 in proportion to the temperature detected by the water temperature sensor 94, The fuel control means 103 supplies fuel in proportion to the temperature detected by the water temperature sensor 94 (S5).
Then, as shown in FIG. 10, it is detected whether or not the detected temperature of the combustion sensor 93 becomes the first set temperature (800 ° C.) (1-2), and the detected temperature of the combustion sensor 93 is set to the first set temperature. When the temperature reaches 800 ° C. (1-2 YES), the burner 57 is stopped (1-3). Thereafter, it is confirmed whether the detected temperature of the combustion sensor 93 is equal to or higher than the first set temperature (800 ° C.) (1-4). When the temperature is lower than the first set temperature (800 ° C.) (1-4 NO), The burner 57 is ignited (1-1).

  In this state, as shown in FIG. 11, the control unit 100 detects whether or not the detected temperature of the combustion sensor 93 becomes the second set temperature (900 ° C.) (S 1). When the temperature is lower than the second set temperature (900 ° C.), the mode setting means 104 maintains the combustion acceleration mode setting (S2). In the combustion promotion mode, control by the damper control means 102 and the fuel control means 103 corresponding to the temperature range lower than the second set temperature is performed. That is, the control of the damper control means 102 is defined in the range of 0 to 100% of the opening degree of the lower damper 91, and the control of the fuel control means 103 is 0 to 100% of the fuel supply capacity of the fuel supply unit 20. The range is defined (S3).

And in this combustion promotion mode, the control part 100 has detected whether the temperature which the water temperature sensor 94 detected becomes preset temperature (80 degreeC) set beforehand (S4), and preset temperature (80 degreeC). If it is less than (S4NO), as in the above, the damper control means 102 opens and closes the opening degree of the lower damper 91 in proportion to the temperature detected by the water temperature sensor 94 as shown in FIG. By 103, fuel is supplied in proportion to the temperature detected by the water temperature sensor 94 (S5).
On the other hand, when the temperature detected by the water temperature sensor 94 is equal to or higher than a preset temperature (80 ° C.) set in advance (YES in S4), the opening degree of the lower damper 91 is substantially closed by the damper control means 102 as shown in FIG. The fuel control means 103 supplies fuel in proportion to the temperature detected by the water temperature sensor 94.

  Further, when the detected temperature of the combustion sensor 93 becomes equal to or higher than the second set temperature (900 ° C.) (S1 YES), the mode setting means 104 sets the combustion suppression mode (S7). In the combustion suppression mode, the control of the damper control means 102 is defined in the range of 0 to 50% of the opening degree of the lower damper 91, and the control of the fuel control means 103 is 0 of the fuel supply capacity of the fuel supply unit 20. It is specified in the range of ˜50% (S8).

And in this combustion suppression mode, the control part 100 has detected whether the temperature which the water temperature sensor 94 detected becomes preset temperature (80 degreeC) set beforehand (S9), and preset temperature (80 degreeC). When it is less than (S9NO), as shown in FIG. 9, the damper control means 102 opens and closes the opening degree of the lower damper 91 in proportion to the temperature detected by the water temperature sensor 94, and the fuel control means 103 sets the water temperature. Fuel is supplied in proportion to the temperature detected by the sensor 94 (S10).
On the other hand, when the temperature detected by the water temperature sensor 94 is equal to or higher than a preset temperature (80 ° C.) set in advance (YES in S9), the damper control means 102 closes the opening of the lower damper 91 and the fuel control means 103 Then, fuel is supplied in proportion to the temperature detected by the water temperature sensor 94 (S11).

  In such combustion in the primary combustion chamber 1, as shown in FIG. 12, the upper damper 90 of the upper air supply pipe 64 is appropriately adjusted to open, and the air outlet of the lower air supply unit 10 is adjusted. 6, air corresponding to the temperature of the secondary combustion chamber 50 and the water temperature of the water tank 71 of the heat exchanging unit 70 is blown out, and the fuel is supplied to the temperature of the secondary combustion chamber 50 and the water tank 71 of the heat exchanging unit 70. Since the solid fuel W in an amount corresponding to the water temperature is supplied, the solid fuel W in the primary combustion chamber 1 can be made to burn with less unburned gas, and a flame is generated in the primary combustion chamber 1 so that the solid fuel W can be almost burned in the primary combustion chamber 1. Further, since the solid fuel W in the primary combustion chamber 1 can be made to burn with less unburned gas, abnormal combustion is prevented and stable combustion is performed. Further, this control eliminates the need for the primary combustion chamber 1 to be water-cooled and simplifies the apparatus.

  Although the combustion gas burned in the primary combustion chamber 1 reaches the secondary combustion chamber 50, it can be burned here as well, so that complete combustion is performed. In this case, since the secondary combustion air feed pipe 66 for feeding the air from the blower 60 is formed in the upper part of the secondary combustion chamber 50, the combustion is performed more reliably. Moreover, since the cyclone function is given to the upper side of the secondary combustion chamber 50, ash can be dropped under the secondary combustion chamber 50, and clean exhaust gas can be exhausted from the feed pipe 55. It becomes like this. In this case, the air from the air outlet 65 is also swirled in the same direction as the combustion gas, so that the cyclone function is reliably exhibited.

  In the above-described embodiment, a thin material of wood is used as the solid fuel W. However, the present invention is not necessarily limited to this, and for example, comparison of heat generation energy (heat generation calorie) such as plastic, rubber, tire, etc. A high solid fuel W can also be used. In this case, it is desirable to set the upper damper 90 of the upper air supply pipe 64 in the blocking position in advance. Thus, when the upper damper 90 of the upper air supply pipe 64 is set to the shut-off position, air blowing from the air outlet 6 of the upper air supply unit 11 is blocked and from the air outlet 6 of the lower air supply unit 10. Only air is blown out. Therefore, the solid fuel W in the primary combustion chamber 1 becomes unburned gas and flows into the secondary combustion chamber 50, and the unburned gas is burned in the secondary combustion chamber 50.

  In this case, since the secondary combustion air supply pipe 66 for supplying the air from the blower 60 is provided in the upper part of the secondary combustion chamber 50, combustion is performed more reliably. Moreover, since the cyclone function is given to the upper side of the secondary combustion chamber 50, ash can be dropped under the secondary combustion chamber 50, and clean exhaust gas can be exhausted from the feed pipe 55. It becomes like this. In this case, the air from the air outlet 65 is also swirled in the same direction as the combustion gas, so that the cyclone function is reliably exhibited.

  Further, since the opening degree of the lower damper 91 is controlled based on the temperature detected by the combustion sensor 93, abnormal combustion is prevented and stable combustion is performed. In particular, since the gasification combustion is performed, the generation of carbon can be suppressed and reliably burned, the clinker can be reduced, the apparatus can be easily maintained, and the durability can be improved.

  That is, according to the present embodiment, first, when incinerating a solid fuel W having a relatively low heat generation energy (heat generation calorie) such as wood, paper, cardboard or waste, the upper damper of the upper air supply pipe 64 is preliminarily incinerated. 90 is set to the open position, and the opening amount of the lower air supply pipe 63 is varied by the lower damper 91 to adjust the air supply amount. In this case, air is supplied from the upper air supply unit 64, and air whose amount is adjusted by the lower damper 91 is supplied from the lower air supply unit 63. Therefore, the solid fuel W in the primary combustion chamber 1 becomes a combustion with less unburned gas, a flame is generated in the primary combustion chamber 1, and the solid fuel W is almost burned in the primary combustion chamber 1.

  On the other hand, when incinerating the solid fuel W having a relatively high heat generation energy (heat generation calorie) such as plastic, rubber, tire, etc., the upper damper 90 of the upper air supply pipe is set in the blocking position in advance. In this state, the lower damper 91 adjusts the air supply amount by varying the opening of the lower air supply pipe 63. In this case, the air blowing from the air outlet of the upper air supply unit 64 is blocked, and only the air whose amount is adjusted by the lower damper 91 is blown out from the lower air supply unit 63. Therefore, the solid fuel W in the primary combustion chamber 1 becomes unburned gas and can flow into the secondary combustion chamber 50, and the unburned gas can be burned in the secondary combustion chamber 50.

  As a result, so-called upper flame combustion and gasification combustion can be switched with one device, and a combustion mode corresponding to the difference in heat generation energy (heat generation calories) of the solid fuel W can be taken. As a result, combustion efficiency can be improved, maintenance of the apparatus can be facilitated, and durability can be improved.

  In the above-described embodiment, the opening / closing control of the upper damper 90 and the lower damper 91 and the fuel supply amount control of the fuel supply unit 20 are not limited to those described above, depending on the fuel and water temperature conditions, etc. Of course, it may be set appropriately. Further, in the fuel supply amount control of the fuel supply unit 20, the variable speed screw conveyor 22 is controlled. However, the constant speed screw conveyor 24 may be changed to a variable speed type, and may be changed accordingly. It doesn't matter.

  Further, the first set temperature (800 ° C.), the second set temperature (900 ° C.), and the water temperature set temperature (80 ° C.) are not limited to this. It can be set to. Further, the solid fuel is not limited to the above-mentioned one, and it is needless to say that any solid fuel may be used. Furthermore, although the primary combustion tower Ta and the secondary combustion tower Tb are provided separately, they are not necessarily limited to this, and may be integrated and appropriately changed.

1 is an overall view showing a boiler device according to an embodiment of the present invention. It is a front view which shows the principal part of the boiler apparatus which concerns on embodiment of this invention. It is a side view which shows the principal part of the boiler apparatus which concerns on embodiment of this invention. It is a top view which shows the principal part of the boiler apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the primary combustion tower of the boiler apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the inner wall in the primary combustion tower of the boiler apparatus which concerns on embodiment of this invention. It is a figure which shows the usage example of the boiler apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the control part of the boiler apparatus which concerns on embodiment of this invention. In the boiler apparatus which concerns on embodiment of this invention, it is a graph which shows the example of control of the opening degree of the damper with respect to the water temperature of the water tank in each mode of combustion promotion mode and combustion suppression mode. It is a flowchart which shows the control process of a burner in the boiler apparatus which concerns on embodiment of this invention. It is a flowchart which shows the control process of each mode of combustion promotion mode and combustion suppression mode in the boiler apparatus which concerns on embodiment of this invention. It is sectional drawing which shows an example of the combustion state in the boiler apparatus which concerns on embodiment of this invention. It is sectional drawing which shows an example of the conventional boiler apparatus.

Explanation of symbols

W Solid fuel Ta Primary combustion tower Tb Secondary combustion tower 1 Primary combustion chamber 3 Communication path 4 Inner wall 5 Outer wall 6 Air outlet 7 Partition 8 Lower air chamber 9 Upper air chamber 10 Lower air supply section 11 Upper air supply section 13 Lower door 15 Receiving port 20 Fuel supply unit 21 Reservoir 22 Speed variable screw conveyor 23 Hopper 24 Constant speed screw conveyor 27 Shuter 30 Stirrer 40 Replenisher 50 Secondary combustion chamber 51 Inner wall 52 Outer wall 54 Lower door 55 Feed / exhaust pipe 55a Lower end 56 outlet 57 burner 59 outlet 60 blower 61 main feed pipe 63 lower air feed pipe 64 upper air feed pipe 65 air outlet 66 secondary combustion air feed pipe 70 heat exchanging part 71 water tank 72 smoke pipe 75 chimney 76 Induction fan 80 Circulation pipe 90 Upper damper 91 Lower damper 93 Combustion sensor 94 Water temperature sensor 100 Burner control means 10 Damper control means 103 fuel control means 104 mode setting means

Claims (8)

A primary combustion tower having a primary combustion chamber for burning solid fuel, a fuel supply section for supplying solid fuel to the primary combustion chamber of the primary combustion tower, and a blower for supplying air to the primary combustion chamber of the primary combustion tower; A secondary combustion tower having a secondary combustion chamber communicating with the primary combustion chamber of the primary combustion tower on the upper side thereof via a communication passage and combusting combustion gas from the primary combustion chamber, and the secondary combustion tower Provided with a burner capable of combusting the combustion gas in the secondary combustion chamber, a water tank in which water is stored, and a smoke pipe which is built in the water tank and through which the exhaust gas from the secondary combustion tower passes. In a boiler device provided with a heat exchanging unit that exchanges heat between exhaust gas passing through and water,
  The primary combustion tower is provided with a lower air supply part for supplying air to the lower side of the primary combustion chamber and an upper air supply part for supplying air to the upper side of the primary combustion chamber, and the lower air supply part A lower air feed pipe for feeding air from the blower to the upper air supply pipe, an upper air feed pipe for feeding air from the blower to the upper air supply section, and the lower air feed pipe A lower damper is provided to adjust the opening of the lower air supply pipe to make the air supply amount variable, and the opening of the upper air supply pipe is adjusted to adjust the amount of air in the upper air supply pipe. Provide a manual upper damper to make the feed amount variable,
  The primary combustion tower includes an inner wall that is formed of a refractory member and forms a primary combustion chamber therein, and an outer wall that surrounds the inner wall with a space therebetween, and is connected to the primary combustion chamber around the inner wall. The air outlet is provided, and the inner wall and the outer wall are partitioned into a lower air chamber and an upper air chamber via a partition, and the lower air chamber is supplied to the lower side of the primary combustion chamber. Configure as a lower air supply unit, configure the upper air chamber as an upper air supply unit for supplying air to the upper side of the primary combustion chamber,
  A combustion sensor for detecting the temperature of the secondary combustion chamber, a water temperature sensor for detecting the temperature of water in the heat exchange unit, and the primary and secondary combustion chambers based on the detected temperature of the combustion sensor and / or water temperature sensor And a controller for controlling the combustion of
Burner control for turning on the burner when the temperature detected by the combustion sensor is lower than a preset temperature set and turning off the burner when the temperature detected by the combustion sensor is equal to or higher than a preset temperature Means, damper control means for controlling the opening of the lower damper based on the temperature detected by the water temperature sensor, and solid fuel supplied by the fuel supply unit based on the temperature detected by the combustion sensor and / or water temperature sensor The fuel control means for controlling the supply amount of the fuel and the temperature corresponding to the temperature range below the second set temperature when the temperature detected by the combustion sensor is preset and lower than the second set temperature higher than the set temperature A combustion acceleration mode for promoting combustion by controlling the damper control means and the fuel control means and the temperature detected by the combustion sensor are preset and set Any of the combustion suppression modes for suppressing combustion by controlling the damper control means and the fuel control means corresponding to the temperature range above the second set temperature when the temperature is higher than the second set temperature. Mode setting means for setting the mode,
In the combustion promotion mode, the control of the damper control means is defined in the range of 0 to 100% of the opening of the lower damper, and the control of the fuel control means is 0 to 100 of the fuel supply capacity of the fuel supply unit. In the combustion suppression mode, the control of the damper control means is specified in a range of 0 to 50% of the opening of the lower damper, and the control of the fuel control means is controlled by the fuel supply unit. Stipulated in the range of 0-50% of fuel supply capacity,
In the combustion acceleration mode and the combustion suppression mode, when the temperature detected by the water temperature sensor is lower than a preset temperature, the damper control means is proportional to the temperature detected by the water temperature sensor. The fuel control means supplies fuel in proportion to the temperature detected by the water temperature sensor, whereas when the temperature detected by the water temperature sensor is equal to or higher than a preset temperature, the damper control means A boiler apparatus characterized in that the opening degree of the side damper is controlled in proportion or controlled to be constant, and the fuel control means supplies fuel in proportion or constant to the temperature detected by the water temperature sensor. 2. The boiler apparatus according to claim 1, wherein a secondary combustion air supply pipe for supplying air from a blower is piped above the secondary combustion chamber. The secondary combustion chamber is provided with an exhaust / exhaust pipe for supplying exhaust gas to the smoke pipe, the lower end of the exhaust / exhaust pipe is provided so as to protrude from the upper center of the secondary combustion chamber, and the outlet of the communication passage is provided. A cyclone function is provided that opens to a position eccentric from a position toward the upper center of the secondary combustion chamber and causes the combustion gas from the outlet of the communication passage to swirl and burn at the upper portion of the secondary combustion chamber,
  An air outlet for providing a swirling flow of air in the same direction as the combustion gas is provided at the upper part of the secondary combustion chamber, and a secondary combustion air supply pipe for supplying air from the blower is connected to the air outlet. The boiler device according to claim 2. The primary combustion tower is provided with a receiving port that opens below the primary combustion chamber and receives a thin solid fuel, and the fuel supply unit includes a hopper that temporarily stores the solid fuel, and a hopper 4. A screw conveyor that transports solid fuel to the primary combustion chamber through the receiving port and that is capable of adjusting the supply amount of the solid fuel by controlling the transport speed by the control unit. The boiler apparatus in any one. The primary combustion tower is provided with a receiving port that opens to the lower side of the primary combustion chamber and receives a thin solid fuel, and the fuel supply unit includes a storage tank for storing the solid fuel, and a solid tank from the storage tank. A variable speed screw conveyor that conveys fuel and is capable of adjusting the supply amount of solid fuel by controlling the conveyance speed by the control unit, and a hopper that receives and temporarily stores the solid fuel conveyed by the variable speed screw conveyor And a screw conveyor having a constant conveying speed for conveying the solid fuel in the hopper to the primary combustion chamber through the inlet of the primary combustion tower. The boiler apparatus according to crab. The storage tank is provided above the hopper, a shooter is provided between the outlet of the variable speed screw conveyor and the hopper, and an interval is provided between the outlet of the shooter and the hopper. 5. The boiler device according to 5. The boiler device according to claim 5 or 6, wherein the storage tank is provided with a stirring device for stirring the solid fuel. A replenishing device for replenishing the solid fuel is provided in the storage tank, and the replenishment device includes a suction blower that sucks the solid fuel and a hose that introduces the solid fuel sucked by the suction blower into the storage tank. The boiler device according to any one of claims 5 to 7, wherein the boiler device is provided.

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