JP2022166325A - Combustion apparatus and ignition of combustion apparatus - Google Patents

Abstract

An object of the present invention is to provide a combustion device that improves the ignitability of fuel when the combustion device is started, achieves both economic efficiency in continuous combustion, and increases the efficiency of a heat exchange section.
A combustion device (1) includes a first storage section (2a) that stores a first fuel (F1), a second storage section (2b) that stores a second fuel (F2), and fuel from the first storage section (2a) and the second storage section (2b). A conveying device 3 is provided for conveying the first fuel F<b>1 and the second fuel F<b>2 into the combustion chamber 4 . In the vicinity of the fuel outlet 343 installed in the combustion chamber 4, an ignition device 47 for igniting the first fuel F1 and the second fuel F2, and below the fuel outlet 343 of the carrier device 3, the first fuel A fire grate 41 on which F1 and the second fuel F2 are placed and burned, an ash receiving part 43 located below the fire grate 41, receiving the ash moved from the fire grate 41 and capable of falling downward, Prepare.
[Selection diagram] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a combustion device using woody solids as fuel.

In a combustion device using woody solids as a fuel, the low water content in the fuel facilitates ignition and improves combustion efficiency in the ignition device when the fuel is burned. Japanese Patent Application Laid-Open No. 2002-301001 discloses a combustion apparatus that stably burns fuel supplied into a combustion chamber under a constant condition of the amount of water contained in the fuel.

This combustion device consists of a combustion chamber, a fuel tank that supplies solid fuel to the combustion chamber and stores the solid fuel, a fuel supply unit that conveys the fuel and supplies it to the combustion chamber, and a fuel tank installed in the lower part of the combustion chamber. a combustion section for placing and burning solid fuel, a combustion air supply section for blowing air into the combustion section, and a heat exchange section for heating liquid with combustion gas generated from the combustion chamber, and a fuel tank Inside, a hot air blowing port is provided for blowing hot air that has been heat-exchanged from hot water generated in the heat exchanging part."

JP 2017-96527 A

However, the combustion device described in Patent Document 1 cannot blow warm air into the fuel tank at the time of start-up, and ignites while the water content in the solid fuel is still high. This causes difficulty in igniting the solid fuel. In addition, since part of the heat energy exchanged in the heat exchange section is blown into the fuel tank, there is a problem that the heat energy that can be extracted from the heat exchange section is reduced. Furthermore, if the amount of water contained in the solid fuel cannot be sufficiently reduced only by the warm air blown into the fuel tank and the water is carried into the combustion chamber, there is a problem of reduced combustion efficiency.

Fuels used in combustion equipment, especially in the case of fuels made from wood, are chips made by cutting or crushing logs, offcuts, branches, shrubs, bark, etc. produced from lumber products, lumber, etc. Pellets are produced by pulverizing sawdust, planer dust, etc. and compressing them at high temperature. Pellets are inherently drier than chips and are suitable for continuous combustion after ignition. In addition, pellets are often more expensive per unit weight than chips, and there is a problem that the economy is inferior in continuous combustion.

Therefore, the present invention has been made with a focus on the above problems, and improves the ignitability of the fuel at the time of starting the combustion device and the economy of continuous combustion, and increases the efficiency of the heat exchange unit. The purpose is to provide an apparatus. Another object is to stabilize normal combustion after ignition of the fuel.

In order to achieve the above object, an aspect of the present invention provides a first transporting device that transports a first fuel, a second transporting device that transports a second fuel, the first fuel transported from the first transporting device, and the second transporting device. A conveying device including a main conveying device that conveys the second fuel conveyed from the conveying device into a combustion chamber, an ignition device that ignites the first fuel and the second fuel, and a combustion gas produced by burning the first fuel and the second fuel. and a chimney having a temperature sensor capable of measuring the temperature of the exhaust gas, wherein the combustion apparatus includes a step of measuring the temperature of the exhaust gas in the chimney after the start of operation; A step of measuring the exhaust temperature in the chimney after the start, a step of measuring the exhaust temperature in the chimney after all the second fuel in the main transfer device is transferred into the combustion chamber, and a step of measuring the exhaust temperature in the chimney after the first fuel is burned. and measuring the exhaust temperature in the chimney after mounting.
In order to achieve the above object, another aspect of the present invention provides a first transport device that transports a first fuel, a second transport device that transports a second fuel, and a first fuel transport device transported from the first transport device. A conveying device including a main conveying device for conveying the fuel and the second fuel conveyed from the second conveying device into the combustion chamber, an ignition device for igniting the first fuel and the second fuel, and the first fuel and the second fuel Combustion comprising a chimney capable of exhausting combusted combustion gas and having a temperature sensor capable of measuring the temperature of the exhaust gas; In the device, the control unit stores the temperature of the exhaust gas in the chimney after the start of operation, the step of storing the temperature of the exhaust gas in the chimney after the second fuel starts burning, and the step of burning all the second fuel in the main carrier device. A method for igniting a combustion device, comprising the steps of: storing the temperature of the exhaust gas in the chimney after being transported into the chamber; and storing the temperature of the exhaust gas in the chimney after the first fuel is placed on the second fuel that is being burned. is the gist.

In order to achieve the above object, another aspect of the present invention provides a first transport device that transports a first fuel, a second transport device that transports a second fuel, and a first fuel transport device transported from the first transport device. A conveying device including a main conveying device for conveying the fuel and the second fuel conveyed from the second conveying device into the combustion chamber, an ignition device for igniting the first fuel and the second fuel, and the first fuel and the second fuel A chimney capable of exhausting combusted combustion gas and having a temperature sensor capable of measuring the temperature of the exhaust gas, a conveying device and an ignition device are operably controlled, the exhaust temperature can be stored, and the exhaust temperature can be kept at a set temperature. and a control unit capable of comparing whether the second fuel is in a combustion apparatus, wherein the control unit stores the temperature of the exhaust gas in the chimney as an initial temperature after the start of operation; a step of determining whether the temperature is higher than the initial temperature by a first set temperature or higher; and determining whether the temperature of the exhaust gas in the chimney after the first fuel is placed on the burning second fuel is higher than the initial temperature and is equal to or higher than the third set temperature. The gist is that it is an ignition method of
In order to achieve the above object, another aspect of the present invention provides a first transport device that transports a first fuel, a second transport device that transports a second fuel, and a first fuel transport device transported from the first transport device. A combustion apparatus comprising: a conveying device including a main conveying device that conveys fuel and a second fuel conveyed from the second conveying device into a combustion chamber; and an ignition device that ignites the first fuel and the second fuel, 2. A step of driving the conveying device and the main conveying device in a plurality of times, a step of operating the ignition device, and determining the exhaust temperature of the combustion gas obtained by burning the first fuel and the second fuel in a plurality of times. a step of determining the exhaust gas temperature by dividing it into a plurality of times, a step of driving only the main transport device after the first determination of the exhaust temperature, and a step of driving only the main transport device after only the main transport device stops, the first transport device and the main transport device and a step of driving in a plurality of times.

ADVANTAGE OF THE INVENTION According to this invention, the combustion apparatus which improves the ignitability to the fuel at the time of starting of a combustion apparatus, improves the economic efficiency in continuous combustion, and raises the efficiency of a heat exchange part can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is front sectional drawing which cut the principal part in the front view of the combustion apparatus which is embodiment of this invention. FIG. 2 is a front cross-sectional view of the combustion apparatus according to the embodiment of the present invention, with a part of the conveying apparatus of FIG. 1 cut away and the combustion chamber enlarged. FIG. 3 is a cross-sectional plan view of the combustion apparatus according to the embodiment of the present invention taken along line AA in FIG. 2 and showing a conveying device and a combustion chamber; FIG. 3 is a side view of the combustion apparatus according to the embodiment of the present invention, taken along the line BB in FIG. 2; 4 is a flow chart of an ignition mode of the combustion device that is the embodiment of the present invention;

An embodiment of the present invention will now be described with reference to the drawings. In the following description of the drawings, the same or similar parts may be given the same or similar reference numerals. The drawings used for explanation are schematic, and the relationship with the dimensions of each part may differ from the actual one.
Also, the technical idea of the present invention can be modified in various ways within the technical scope defined by the claims.

The combustion device 1 of the present invention shown in FIGS. and a transport device 3 for transporting two fuels F2. The combustion device 1 further includes a combustion chamber 4 for arranging the first fuel F1 and the second fuel F2 conveyed by the conveying device 3 on the fire grate 41 and burning the first fuel F1 and the second fuel F2 in the combustion chamber 4. A heat exchange section 6 that exchanges heat with high-temperature combustion gas generated by burning two fuels F2 is provided. The combustion device 1 having such a configuration recovers thermal energy in the heat exchange section 6 from the heat generated by burning the first fuel F1 and the second fuel F2, and utilizes this thermal energy.

The configuration of the combustion device 1 will be described in detail.
The first fuel reservoir 2a shown in FIG. 1 is a box-shaped container provided in the shape of a rectangular parallelepiped, and has a hole 2a1 on the lower surface. The structure is such that the first fuel F1 can be stored inside the first fuel reservoir 2a, and the first fuel F1 can be discharged from the hole 2a1. In the embodiment to be described, the first fuel reservoir 2a is provided as large as 1 to 2 m on one side, so that a large amount of the first fuel reservoir 2a can be stored. In the vicinity of the hole 2a1 inside the first fuel reservoir 2a, there is provided a stirrer 2a2 having arms radially with respect to a rotating shaft that rotates about the vertical direction. The stirring portion 2a2 stirs the first fuel F1 inside the first fuel storage portion 2a, guides it to the hole portion 2a1, and discharges it from the hole portion 2a1.

A second fuel reservoir 2b is provided separately from the first fuel reservoir 2a and capable of storing the second fuel F2. The second fuel storage part 2b is a funnel member provided in the shape of a quadrangular pyramid that narrows downward, and a hole part 2b1 is opened in the downward narrowed part. After the second fuel F2 is charged, the second fuel reservoir 2b can store the second fuel F2 and can discharge the second fuel F2 from the hole 2b1. The volume of the second fuel reservoir 2b is set smaller than the volume of the first fuel reservoir 2a.

Here, the first fuel F1 and the second fuel F2 will be explained.
The first fuel F1 is the main fuel to be burned in the combustion device 1, and chips mainly made of wood are used. Wood chips have various sources and origins, and include, for example, trunks such as logs, thinned materials such as branches, shrubs, pruned branches, bark, etc., which are further cut or crushed. For this reason, the wood chips themselves do not have a fixed shape and have various dimensions, but the dimensions suitable for the combustion device 1 are preferably 80 mm or less in width, 30 mm or less in length, and 4 mm or less in thickness. .
The amount of moisture contained in the wood chips used as the first fuel F1 varies depending on the sources and origins. The amount of water contained in the fuel is expressed as a water content, and the water content of the first fuel F1 is calculated as the ratio of the water weight to the total weight including water. The water content of the first fuel F1 ranges widely from 10 to 55% by weight, and although there are many variations, it is inexpensive and highly available, and is suitable as a fuel for continuous use.

On the other hand, the second fuel F2 is used as an auxiliary fuel for ignition in the combustion device 1 . The second fuel F2 is wood pellets obtained by finely pulverizing wood and hardening it into a small cylindrical shape. The wood pellet is molded into a cylindrical shape with a diameter of 6-8 mm and a height of 10-12 mm. Moreover, since wood pellets are compression-molded at high temperatures, wood pellets with a stable shape and a water content of 10% by weight or less are generally distributed. For this reason, the weight percentage expressed as the moisture content of the first fuel F1, which is wood chips, is the same as or higher than the weight percentage of the second fuel F2, which is wood pellets. The second fuel F2, which has good shape stability and a low moisture content, can be said to have good ignitability and combustibility, but is more expensive than the first fuel F1 and has poor cost performance for continuous use. has the aspect of

Now, the first fuel F1 and the second fuel F2 described above are discharged downward from the hole 2a1 of the first fuel reservoir 2a and the hole 2b1 of the second fuel reservoir 2b, respectively, and sent to the transport device 3. . The conveying device 3 includes a first conveying portion 31 that conveys the first fuel F1, a second conveying portion 32 that conveys the second fuel F2, and a further downstream side at the junction of the first conveying portion 31 and the second conveying portion 32. It has a paddle portion 33 for transporting and a main transport portion 34 for transporting the fuel sent from the paddle portion 33 further downstream to the combustion chamber 4 .

The first conveying portion 31 is provided with a long tubular member 311 arranged such that one end thereof is positioned below the first fuel storage portion 2a and the other end thereof is lifted upward. An injection conduit 312 for guiding the first fuel F1 discharged from the hole 2a1 of the first fuel reservoir 2a to the inside of the tubular member 311 is attached to the upper portion of the tubular member 311 on one end side. . The first fuel F1 introduced into the cylindrical member 311 from the input passage 312 is directed to the other end side of the cylindrical member 311 by a first screw 313 having a spiral blade provided coaxially with the cylindrical member 311 inside the cylindrical member 311. Sent. The first screw 313 is rotationally driven by a first conveying motor 314 provided on the other end side of the tubular member 311 to convey the first fuel F1. The first fuel F<b>1 sent to the other end side of the tubular member 311 passes through a relay pipe line 315 provided in the lower portion of the other end side of the tubular member 311 and is sent from above the paddle portion 33 .

On the other hand, the second fuel F2 discharged from the hole portion 2b1 of the second fuel storage portion 2b is conveyed by the second conveying portion 32. As shown in FIG. The second transport section 32 has a horizontally elongated cylindrical member 321 . A hole portion 2b1 of the second fuel storage portion 2b is connected to one end side of the tubular member 321, and the second fuel F2 is directly put into the inside of the tubular member 321. As shown in FIG. A second screw 322 having a helical blade is attached to the inside of the cylindrical member 321 coaxially with the axis of the cylinder. A second conveying motor 323 is positioned at one end of the tubular member 321, and rotates the second screw 322 to convey the second fuel F2 from one end side of the tubular member 321 to the other end side. The other end of the tubular member 321 is connected to the upper side of the paddle portion 33 so that the second fuel F2 is sent to the upper side of the paddle portion 33 .

The paddle part 33 has a paddle channel 331 having a rectangular cross section arranged in the vertical direction and a paddle 332 arranged so as to span the walls of the paddle channel 331 facing each other. The paddle 332 is a rotatable member arranged in the vertical central portion of the paddle channel 331, and the rotation axis is oriented in the horizontal direction. The paddle 332 is provided with a plurality of blades 333 radially with respect to the rotation axis, and the rotating outer peripheral edge of the blades 333 of the paddle 332 during rotation is set so as to be close to the wall surface of the paddle conduit 331 . By rotating the paddle 332, the paddle channel 331 can be intermittently blocked by the blade plate. As the paddle 332 rotates, the first fuel F1 and the second fuel F2 are intermittently supplied to the main transfer section 34 located below the paddle section 33, and smoke and hot air from the combustion chamber 4, which will be described later, are transferred to the paddle section 33. It prevents the fuel from flowing to the first transporting portion 31, the second transporting portion 32, the first fuel storage portion 2a, and the second fuel storage portion 2b, which are located further upstream.

The main transport section 34 has a horizontally elongated cylindrical member 341 . A carry-in port 342 opened to connect with the paddle portion 33 is located in the upper portion of one end side of the tubular member 341, and the first fuel F1 and the second fuel F2 fed from the paddle portion 33 are introduced into a cylinder. inside the shaped member 341 . The other end of the cylindrical member 341 is connected to the combustion chamber 4, which will be described later, and provided with a fuel outlet 343 serving as a portion for supplying the first fuel F1 and the second fuel F2. The fuel outlet 343 has a shape obtained by cutting the other end of the cylindrical member 341 in a direction perpendicular to the axial direction of the cylinder. A main screw 344 is provided inside the cylindrical member 341 in the longitudinal direction. The main screw 344 is a rotating shaft having a helical member, and by being rotationally driven, conveys the first fuel F1 and the second fuel F2 from the inlet 342 to the fuel outlet 343 and supplies them to the combustion chamber 4, which will be described later.

Both the paddle 332 and the main screw 344 are driven by a main transport motor 345 . The main conveying motor 345 is positioned at one end of the cylindrical member 341 and drives the main screw 345 to rotate. A sprocket is attached to each of the main screw 344 and the paddle 332 located above the main screw 344, and a chain is wound around these sprockets to transmit the rotation of the motor to the paddle 332 as well. The first fuel F1 and the second fuel F2 are supplied into the combustion chamber 4 by the paddle 332 and the main screw 344 which are driven to rotate.

The combustion chamber 4 includes a fire grate 41 in which the first fuel F1 and the second fuel F2 are placed and can be burned, and an ash receiving part for receiving ash temporarily generated on the fire grate 41. 43 and. Further, the combustion chamber 4 includes an ash transfer section 45 that collects the ash in the ash receiving section 43 and transfers it to the outside of the combustion chamber 4, and an ignition device 47 that ignites the first fuel F1 and the second fuel F2. .

The combustion chamber 4 is a vertically elongated box-shaped polyhedron having a space for combustion inside. A fuel discharge port 343 of the main conveying portion 34 is protruded inside the combustion chamber 4 and can supply the first fuel F<b>1 and the second fuel F<b>2 into the combustion chamber 4 .

A fire grate 41 is positioned below the fuel outlet 343 positioned within the combustion chamber 4 , and the first fuel F<b>1 and the second fuel F<b>2 are supplied onto the grate 41 . The fire grate 41 is parallel to the rotation axis of the main screw 34 and is formed in a stepped shape that descends as it advances into the combustion chamber 4 . In the embodiment, the fire grate 41 is set in five stages. The fire grate 41 is made up of a plurality of members which are formed by bending the ends of horizontally installed plate-like members downward in a V-shape with the direction orthogonal to the rotation axis of the main screw 34 as the ridge line, as shown in FIG. It is formed as In other words, the structure is such that the lower the stepped portion of the fire grate 41, the further away from the fuel outlet 343 is.

As the main screw 34 continues to rotate, the first fuel F1 and the second fuel F2 supplied from the fuel discharge port 343 so as to be pushed out by the main screw 34 and then placed on the fire grate 41 are supplied later. With the first fuel F1 and the second fuel F2, it is possible to push down the stepped fire grate 41 .

To start combustion on the grate 41, the second fuel F2 is first ignited. A detailed control flow leading to ignition will be described later, but first, the second fuel F2 is supplied onto the grate 41 little by little. After that, the second fuel F2 on the placed fire grate 41 is ignited by blowing hot air from the ignition device 47 . The ignition device 47 is located above the grate 41 and near the fuel outlet 343 . The ignition device 47 ignites the small amount of the second fuel F2 on the grate 41 by spraying the air heated by the heat transfer section 471 onto the fire grate 41 . After that, the combustion of the second fuel F2 is stabilized by gradually supplying the second fuel F2 onto the grate 41 in stages.

The heat transfer portion 471 is provided inside an air supply pipe 472 for guiding air into the combustion chamber 4 through the pipe-shaped air supply pipe 472 . The air supply pipe 472 is connected to an air supply fan 49 provided outside the combustion chamber 4 to send the sucked air to the heat transfer section 471 . The outlet of the air supply pipe 472 protrudes into the combustion chamber 4, and the heat transfer section 471 is positioned in the vicinity of this outlet. The air thus heated efficiently hits the second fuel F2 to promote ignition. In addition, the heat transfer part 471 can generate heat by electric energy, and there is no need to mount additional fuel in addition to the first fuel F1 and the second fuel F2 for a flame burner using fossil fuel or the like. . Therefore, the fuel required for operating the combustion device 1 can be reduced to the first fuel F1 and the second fuel F2.

The first fuel F1 is supplied by the conveying device 3 to the second fuel F2 that has been ignited by the ignition device 47 and is stably burning, so that the first fuel F1 starts burning. The burning first fuel F<b>1 continues to be sent step by step onto the grate 41 by the conveying device 3 . The flame that is burning on the fire grate 41 is pushed by the first fuel F1 supplied from the fuel outlet 343 , so it is positioned away from the fuel outlet 343 . In the embodiment shown in FIG. 2, the flame is positioned from the corner of the first stage to the corner of the third stage of the grate 41 .

By combusting at a location away from the fuel outlet 343, the first fuel F1 positioned in the fuel outlet 343 and near the fuel outlet 343 on the fire grate 41 is heated by the combustion flame, and the moisture contained therein is reduced. Evaporate. As a result, the first fuel F1 supplied into the combustion chamber 4 has a lower moisture content, and is in a state of being more dry than when it was stored in the first fuel reservoir 2a. The first fuel F1 is pushed out to the flame side as the first fuel F1 is newly supplied from the fuel discharge port 343 by the transfer device 3 . Then, the dried first fuel F1 is ignited by the flame and starts burning. At this time, the first fuel F1 is in a state where drying has progressed, so the combustion efficiency is good and the combustion can be stably continued.

An air supply box 48 having a plurality of holes 481 is provided on both left and right sides with respect to the direction in which the first fuel F1 and the second fuel F2 on the fire grate 41 are pushed out. The air supply box 48 sends the air sent from the air supply fan 49 from the holes 481 to the lateral sides of the first fuel F1 and the second fuel F2 on the grate 41 to assist combustion. Furthermore, the hole 481 of the air supply box 48 is also provided below the fire grate 41 . Notch portions 411 are provided in stepped portions recessed downward at both left and right portions of the fire grate 41 with respect to the direction in which the first fuel F1 and the second fuel F2 are pushed out. The air sent from the hole 481 passes through the notch 411 and is sent to the first fuel F1 and the second fuel F2. Since there is no hole in the lower surface of the portion where the first fuel F1 and the second fuel F2 are placed and burned, the first fuel F1 and the second fuel F2 and the ashes after combustion can fall downward. None. Furthermore, since air can be supplied from the cutouts 411 located near the left and right sides in the direction in which the burning first fuel F1 and the second fuel F2 are pushed out, they can be burned efficiently.

Due to the first fuel F1 continuously supplied from the fuel discharge port 343, the burning first fuel F1 and second fuel F2 are burned while moving down the stairs on the fire grate 41, and as they go down on the fire grate 41, The fire gradually extinguishes and turns to ashes. The ash is gradually pushed downward from the fire grate 41 and reaches the ash receiver 43 .

The ash receiving portion 43 includes a movably provided rocking plate 431, a fixed plate 432 which abuts on the lower surface of the rocking plate 431 and is fixed to the combustion chamber 4, and the rocking plate 431. It has a rocking motor 433 for rocking the . Further, the ash receiver 43 has a groove member 44 and a discharge screw 45, and can transfer the ash that has moved from the fire grate 41 to the outside of the combustion chamber 4.

The rocking plate 431 is a rectangular thick plate and is positioned at the bottom of the stepped portion of the fire grate 41 . Below the oscillating plate 431 , there is a fixed plate 432 fixed to the combustion chamber 4 by a thick rectangular plate similar to the oscillating plate 431 . and fixed plate 432
is provided for reciprocating movement between above. One end of a slide rod 434 is connected to the end of the rocking plate 431 so as to be slidable in the axial direction, and the other end of the slide rod 434 protrudes outside the combustion chamber 4 . One end of a crank rod 435 is rotatably connected to the other end of the slide rod 434 . Further, the other end of the crank rod 435 is rotatably connected to a surface near the outer periphery of a rotatably provided disc-shaped disk 436 .

The center surface of the disc 436 is fixed to a swing motor 433 provided outside the combustion chamber 4, so that the disc 436 can be rotationally driven. The rotation of the disk 436 enables the slide rod 434 to reciprocate through the crank rod 435, and the rocking plate 431 connected to the slide rod 434 can also reciprocate. In embodiments, the wobble plate 431 reciprocates parallel to the axis of rotation of the main screw 34 . Further, the swing motor 433 is driven to rotate at 10 to 15 revolutions per minute, and is driven for 2 minutes once every 30 minutes during continuous combustion of the first fuel F1.

The ash that has moved downward on the fire grate 41 moves onto the rocking plate 431 or the fixed plate 432 so as to be pushed out from the fuel outlet 343 by the first fuel F1.
When the rocking plate 431 is at a position away from the fuel outlet 343 and the ash moves onto the rocking plate 431, the ash on the rocking plate 431 moves toward the fuel outlet 343 and moves toward the fire grate. It is scraped off by the lower plate of 41. The ash relatively moves on the rocking plate 431 and then falls on the fixed plate 432 . After that, the rocking plate 431 moves away from the fuel outlet 343 by reciprocating motion, and the ash on the fixed plate 432 is pushed out by the end surface of the rocking plate 431 to drop the ash into the groove member 44 . When the rocking plate 431 is located near the fuel discharge port 343 and the ash moves directly onto the fixed plate 432, the ash on the fixed plate 432 moves to the rocking plate 431 as the rocking plate 431 moves. The ash is dropped into the groove member 44 by pushing out at the end face.

The groove member 44 is a member formed by bending a rectangular plate into a U shape and forming a groove with the opening side facing upward. The direction of the groove of the groove member 44 is directed in a direction perpendicular to the rotating shaft of the main screw 34 , and one end of the groove member 44 extends outside the combustion chamber 4 . Ashes on the fixed plate 432 fall into the grooves of the groove member 44 . A discharge screw 45 is arranged in the groove of the groove member 44 in parallel with the groove, and the ash falling into the groove of the groove member 44 is carried out of the combustion chamber 4 by the discharge screw 45 . Therefore, ash generated after combustion of the first fuel F1 and the second fuel F2 does not accumulate in the combustion chamber 4 .

The combustion gas heated to a high temperature by burning the first fuel F<b>1 and the second fuel F<b>2 in the combustion chamber 4 moves to the heat exchange section 5 adjacent to the combustion chamber 4 . The heat exchange section 5 includes a cylindrical smoke pipe 51 provided on the side of the combustion chamber 4, a gas chamber 52 arranged to surround the smoke pipe 51, and a chimney 53 for exhausting combustion gas. Further, the heat exchange section 5 is provided with a blower fan 53 fixed to the gas chamber 52 to blow air to the smoke pipe 51 and a pipe for sending the air having received heat from the smoke pipe 51 by the blower fan 53 .

The smoke pipe 51 consists of a pipe, and a plurality of smoke pipes 51 are installed in the vertical direction through a vertically long gas chamber 52 , and combustion gas passes through the inside of the smoke pipe 51 . The smoke pipe 51 consists of an input side smoke pipe 511 through which the combustion gas passes downward from the upper part of the combustion chamber 4, and a discharge side pipe 512 through which the combustion gas passing through the input side pipe 511 passes upward on the discharge side.

A plurality of input-side smoke pipes 511 and discharge-side smoke pipes 512 are provided, respectively, and are grouped together to form a group. Since the combustion gas is ventilated to each of these groups, the combustion gas is discharged from the chimney 54 provided above the gas chamber 52 without being disturbed. A temperature sensor 541 is installed in the outlet of the chimney 54 to measure the temperature of the combustion gas.

The hot combustion gas can exchange heat by passing through the smoke pipe 51 arranged in the gas chamber 52 . A blower fan 53 is attached to the side of the gas chamber 52 , and the air is sent into the gas chamber 52 by the blower fan 53 . The blown air stays and circulates in the gas chamber 52 and hits the input side smoke pipe 511 and the discharge side smoke pipe 512 . By doing so, the air sent into the gas chamber 52 exchanges heat from the smoke pipe 51 and becomes high temperature.

A helical member 56 is inserted into the smoke tube 51 in order to make the heat exchange more efficient. The helical member 75 is formed by molding a strip-shaped metal plate or bar-shaped member into a helical shape. The combustion gas moves in the smoke pipe 51 while swirling along the helical material 75, thereby extending the movement distance of the combustion gas. The helical material 75 allows the combustion gas to move through the smoke pipe 71 over a long period of time, so that the heat of the combustion gas can be effectively transferred from the smoke pipe 71 to the air sent by the blower fan 53 in the gas chamber 52 . After the heat exchange, the combustion gas loses heat, is cooled, and is exhausted from the chimney 54 .

The air sent by the blower fan 53 is sent outside the gas chamber 52 through a pipe 55 connected to the gas chamber 52 after heat exchange. A pipe 55 having one end connected to the gas chamber 52 is installed so that the other end passes through the middle portion of the combustion chamber 4 , and the air after heat exchange traverses the combustion chamber 4 . In the embodiment, the cross section of the pipe 55 in the direction perpendicular to the direction of air flow is pentagonal, and the lower surface of the pipe 55 is inclined with straight lines connecting the corners of the steps of the fire grate 41. parallel to the line.

By doing so, the pipe 55 is exposed to the high-temperature combustion gas generated in the combustion chamber 4 and to the flame generated on the fire grate 41 . The post-heat exchange air passing through the piping 55 also receives heat from the piping 55 that crosses the combustion chamber 4 . As a result, the air discharged from the other end of the pipe 55 through the gas chamber 52 and the pipe 55 from the blower fan 53 is in a state of receiving more heat, and the air at a higher temperature can be obtained. This high-temperature air is used, for example, for heating and drying indoors and agricultural houses. A temperature sensor 551 is attached to the inside of the other end of the pipe 55 to measure the air temperature after heat exchange.

Using the combustion apparatus 1 configured as described above, the steps from the stop state to the ignition will be described based on the flow chart shown in FIG. Symbols Si (i=1, 2, . . . ) in the figure indicate each step. The combustion device 1 has an ignition mode in which combustion is ignited from a stopped state, and a normal combustion mode in which stable combustion is performed after ignition. Here, the ignition mode from a stopped state to ignition will be described.

When the operation switch (not shown) of the combustion device 1 in the stopped state is operated, the ignition mode is started by the control program stored in the control section (not shown). Then, it shifts to S1 and measures the initial temperature of the chimney. A temperature sensor 541 installed in the chimney 54 measures the temperature of the exhaust gas moving or staying in the chimney 54 . The measured values are stored in the controller.

When S1 ends, the process proceeds to S2, in which the second transport motor 323 and the main transport motor 345 are driven. Then, the second fuel F2 stored in the second fuel storage portion 2b passes through the second conveying portion 32 and the main conveying portion 34 and is placed on the grate 41 inside the combustion chamber 4. As shown in FIG. In this embodiment, the drive setting time of the motor driven in S2 is set to 50 seconds. After the set time has elapsed, the control shifts to S3 to stop the second conveying motor 323 and the main conveying motor 345 and stop the supply of the second fuel F2 to the fire grate 41 .

Next, in S4, the heat transfer portion 471 of the ignition device 47 is energized and the air supply fan 49 is driven. Then, the air sent by the air supply fan 49 is heated by passing through the heated heat transfer section 471 installed in the air supply pipe 472 . The heated air turns into hot air and is blown onto the second fuel F2 on the fire grate 41 . Then, the second fuel F2 is heated by hot air and then ignited. Also, the air is sent to the air supply box 48 in the combustion chamber 4 by the air supply fan 49 , and the air is blown to the lower part and the side part of the grate 41 . Then, air is sent to the second fuel F2 on the fire grate 41 from the hole 481 of the air supply box 48 and the notch 411 of the fire grate 41 to promote combustion.

After that, the process proceeds to S5, the second transport motor 323 and the main transport motor 345 are driven again, and the supply of the second fuel F2 is resumed. Further, the second fuel F2 is supplied to the second fuel F2 on the fire grate 41 that has started to ignite, thereby continuing the combustion without extinguishing the fire. In this embodiment, the drive setting time of the motor driven in S5 is set to 30 seconds.
After the set time has elapsed, the control shifts to S6 to stop the second conveying motor 323 and the main conveying motor 345 and stop the supply of the second fuel F2 to the fire grate 41 . In addition, the hot air continues to blow to the second fuel F2 on the fire grate 41 during S5 to S6, assisting the initial combustion generated by S4.

After that, the process proceeds to S7, the second transport motor 323 and the main transport motor 345 are driven again, and the second fuel F2 is supplied onto the grating 41. In this embodiment, the drive setting time of the motor driven in S7 is set to 20 seconds. After the set time has elapsed, the control shifts to S8 to stop the second transport motor 323 and the main transport motor 345. FIG.

After S8, control passes to S9. In S9, the control unit measures the temperature of the exhaust gas in the chimney 54, stores it, and then proceeds to S10.
In S10, the controller determines whether the temperature measured in S9 is higher than the temperature measured in S1 by a first set temperature or more. In the embodiment, the first set temperature is set at 20 degrees Celsius. If it is determined No in S10, it is determined that the combustion is insufficient, and the process returns to S7, whereupon the control section executes the control of S7 to S9. If it is determined Yes in S10, it is determined that combustion is occurring in the combustion chamber 4, and the process proceeds to S11.

In S11, the control section drives the main transport motor 345 again. In this embodiment, the main transport motor 345 is driven for 60 seconds. As a result, all of the second fuel F2 remaining in the main conveying portion 34 is sent into the combustion chamber 4, leaving the tubular member 341 empty. Then, since it does not mix with the first fuel F1 supplied later, it is possible to avoid combustion problems such as misfiring caused by differences in ignition characteristics and combustion characteristics. After that, the process proceeds to S12 and the main transport motor 345 is stopped.

Next, in S13, the exhaust temperature in the chimney 54 is measured and stored. After that, the process proceeds to S14. In S14, the controller determines whether the temperature measured in S13 is higher than the temperature measured in S1 by the second set temperature or more. In the embodiment, the second set temperature is set at 60 degrees Celsius. If it is determined No in S14, it is determined that the combustion is insufficient and the process returns to S11, and the control unit executes the control of S11 to S13. When it is determined Yes in S14, the control unit determines that combustion is normally continued in the combustion chamber 4, and the process proceeds to S15.

After shifting to S15, the energization to the heat transfer portion 471 is stopped. Then, the blowing of hot air from the air supply pipe 472 to the second fuel F2 on the fire grate 41 is stopped, and the process proceeds to S16.
In S16, the first transport motor 314 and the main transport motor 345 are driven. Then, the first fuel F1 stored in the first fuel storage portion 2a passes through the first conveying portion 31 and the main conveying portion 34, and burns on the fire grate 41 in the combustion chamber 4 and on the fire grate 41. It is placed on 2 fuel F2. The set number of rotations of the first conveying motor 314 driven in S16 is set to the first number of rotations, and the fuel is continuously sent from the fuel outlet 343 onto the grate 41 little by little. In this embodiment, the first rotation speed of the first transport motor 314 is set to 1.2 revolutions/minute. This has the effect of not interfering with the combustion of the second fuel F2 on the grate 41 by gradually feeding the first fuel F1.

After S16, the process proceeds to S17. At S17, the temperature of the exhaust gas in the chimney 54 is measured and stored. After that, the process proceeds to S18.
In S18, the controller determines whether the temperature measured in S17 is higher than the temperature measured in S1 by a third set temperature or more. In the embodiment, the third preset temperature is set to 100 degrees Celsius. If it is determined No in S18, it is determined that the combustion is insufficient and the process returns to S16, and the control unit executes the control of S16 to S17. When it is determined Yes in S18, the control unit determines that the combustion is normally continued in the combustion chamber 4, and proceeds to S19.

In S19, the first transport motor 314 is rotationally driven at the second rotation speed. The second rotation speed is set to a rotation speed faster than the first rotation speed. In the described embodiment, the second rotation speed of the first transport motor 314 is set at 1.8 revolutions per minute. Therefore, more of the first fuel F1 stored in the first fuel storage portion 2a is sent to the main transfer portion 34 than in S16, and as a result, the first fuel F1 sent into the combustion chamber 4 per unit time is S19 is more than S16. This is because the step of S18 allows the combustion of the first fuel F1 to proceed in the combustion chamber 4, and it can be determined that the combustion is stable. to further promote combustion.

After S19, the control step proceeds to S20. In S20, the temperature sensor 551 installed at the outlet of the pipe 55 determines whether or not the air temperature is equal to or higher than the set temperature. When combustion is normally performed in the combustion chamber 4 in steps up to S19, combustion gas is generated normally. High-temperature combustion gas passes through the heat exchange section 5 and is exhausted. The air that has passed through the piping 51 of the heat exchange section 5 exchanges heat with a blower fan 53 that is controlled separately from the ignition mode, and receives heat. After the heat exchange, the air is in a heated state, and the temperature sensor 551 measures the temperature of the blown air after passing through the pipe 55 . If it is determined No in step S20, it is determined that the air temperature is not equal to or higher than the set temperature, and the process proceeds to step S21-1.

After shifting to S21-1, the control unit determines whether or not the exhaust temperature of the chimney 51 has increased from the initial temperature by a fourth set temperature or more. In the embodiment, the fourth preset temperature is set to 100 degrees Celsius. If it is determined No in S21-1, the control shifts to S22. Then, the controller judges that the combustion in the combustion chamber 4 is not normal, the controller abnormally stops the combustion device 1, and the ignition mode ends. If it is determined Yes in S21-1, the control unit determines that combustion is occurring in the combustion chamber 4 but the temperature of the combustion gas has not risen, and the return control is repeated up to S19.

If it is determined Yes in S20, the control section determines that the combustion in the combustion section 4 and the heat exchange in the heat exchange section 5 are normally performed, and shifts to S21-2. In S21-2, the control unit shifts the combustion mode to the normal combustion mode, and then terminates the ignition mode.

By controlling the ignition process as described above, the second fuel F2 and the first fuel F1 can be ignited more reliably, and the combustion device 1 can burn the fuels normally after the completion of the ignition.

5, the second conveying motor 323 and the main conveying motor 345 are repeatedly driven and stopped a plurality of times, thereby gradually burning the second fuel sent onto the fire grate 41. can be performed reliably. In this embodiment, after the control step S4, the second transport motor 323 and the main transport motor 345 are repeatedly driven and stopped twice. Combustion can be controlled.

The driving times of the first conveying motor 314, the second conveying motor 323, and the main conveying motor 345 shown in the above-described embodiment may be times other than those described above, and may be adjusted according to the environment in which the combustion apparatus 1 is used and the characteristics of the fuel used. It can be changed at any time.

In addition, although the number of rotations of the main transport motor 345 in S16 to S19 shown in the above-described embodiment is shown as two types as the first and second number of rotations, the number of rotations of the third and higher numbers is set. Alternatively, the number of revolutions may be set to gradually increase as the control step progresses. Also, the third rotation speed may be set in steps after S21-2. In this case, since the amount of the first fuel F1 supplied into the combustion chamber 4 can be made more precise, more precise combustion control is possible.

Further, although the number of revolutions of the main transport motor 345 is shown as a specific number of revolutions as the first and second number of revolutions, the number of revolutions may be changed according to the environment in which the combustion apparatus 1 is used and the characteristics of the fuel used. It can be changed arbitrarily.

Further, although the number of revolutions of the swing motor 433 and the interval of time to start are illustrated as specific values of the number of revolutions, they can be arbitrarily changed in accordance with the degree of combustion and the combustion characteristics of the fuel used.

With the combustion device 1 configured as described above, it is possible to provide a combustion device that improves the ignitability of the fuel at the start of the combustion device 1, improves the economy of continuous combustion, and increases the efficiency of the heat exchange section. Also. By adopting the ignition method suitable for the combustion apparatus 1 as described above, the second fuel F2 and the first fuel F1 can be ignited more reliably, and normal combustion can be stabilized thereafter.

Although the present invention has been described by the above embodiments, the statements and drawings forming part of this disclosure should not be understood to limit the present invention. It goes without saying that modifications to the embodiments, examples, and operational techniques based on this disclosure are possible within the scope of the claims.

1 Combustion Device 2a First Fuel Reservoir 2b Second Fuel Reservoir 3 Conveying Device 31 First Conveying Section 32 Second Conveying Section 34 Main Conveying Section 4 Combustion Chamber 41 Grate 411 Notch 43 Ash Receiving Section 431 Rocking Plate 432 Fixed plate 47 Ignition device 5 Heat exchange unit F1 First fuel F2 Second fuel

Claims (5)

a first transporting device that transports a first fuel, a second transporting device that transports a second fuel, the first fuel transported from the first transporting device, and the second fuel transported from the second transporting device a conveying device including a main conveying device for conveying into a combustion chamber; an ignition device for igniting the first fuel and the second fuel; A combustion apparatus comprising a chimney having a temperature sensor capable of measuring temperature,
a step of measuring the exhaust temperature in the chimney after the combustion apparatus starts operating;
measuring the exhaust temperature in the chimney after the second fuel starts burning;
a step of measuring the exhaust temperature in the chimney after all the second fuel in the main transfer device has been transferred into the combustion chamber;
measuring the exhaust temperature in the chimney after the first fuel is placed on the burning second fuel;
A method for igniting a combustion device, comprising: a first transporting device that transports a first fuel, a second transporting device that transports a second fuel, the first fuel transported from the first transporting device, and the second fuel transported from the second transporting device a conveying device including a main conveying device for conveying into a combustion chamber; an ignition device for igniting the first fuel and the second fuel; A combustion apparatus comprising: a chimney having a temperature sensor capable of measuring temperature;
a step in which the control unit stores the temperature of the exhaust gas in the chimney after operation is started;
storing the exhaust temperature in the chimney after the second fuel starts burning;
a step of storing the temperature of the exhaust gas in the chimney after all the second fuel in the main conveying device has been conveyed into the combustion chamber;
storing the exhaust temperature in the chimney after the first fuel is placed on the burning second fuel;
A method for igniting a combustion device, comprising: a first transporting device that transports a first fuel, a second transporting device that transports a second fuel, the first fuel transported from the first transporting device, and the second fuel transported from the second transporting device a conveying device including a main conveying device for conveying into a combustion chamber; an ignition device for igniting the first fuel and the second fuel; A control capable of operably controlling a chimney having a temperature sensor capable of measuring temperature, the conveying device, and the ignition device, capable of storing the exhaust temperature, and capable of comparing whether the exhaust temperature is a set temperature. A combustion device comprising:
a step of storing the temperature of the exhaust gas in the chimney as an initial temperature after the operation is started;
a step of determining whether the temperature of the exhaust gas in the chimney after the second fuel starts burning is higher than the initial temperature and is equal to or higher than a first set temperature;
a step of determining whether the temperature of the exhaust gas in the chimney after all the second fuel in the main transfer device has been transferred into the combustion chamber is higher than the initial temperature and is equal to or higher than a second set temperature;
a step of determining whether the temperature of the exhaust gas in the chimney after the first fuel is placed on the burning second fuel is higher than the initial temperature to a third set temperature;
A method for igniting a combustion device, comprising: The combustion device includes a pipe capable of exchanging heat with the combustion gas, and a temperature sensor inside the pipe for measuring the temperature of the blown air after heat exchange,
When the temperature of the exhaust gas in the chimney is higher than the initial temperature and is equal to or higher than a third set temperature, and the air temperature after heat exchange by the temperature sensor for measuring the air temperature is not equal to or higher than the set temperature , a step of determining whether the exhaust temperature in the chimney has increased from the initial temperature to a fourth set temperature or higher;
4. The method of igniting a combustion device according to claim 3, comprising: a first transporting device that transports a first fuel, a second transporting device that transports a second fuel, the first fuel transported from the first transporting device, and the second fuel transported from the second transporting device A combustion apparatus comprising a conveying device including a main conveying device for conveying into a combustion chamber, and an ignition device for igniting the first fuel and the second fuel,
a step of driving the second conveying device and the main conveying device in a plurality of times;
activating the ignition device;
a step of determining the exhaust temperature of the combustion gas obtained by burning the first fuel and the second fuel in a plurality of steps;
a step of driving only the main transport device after determining the exhaust gas temperature for the first time in the step of determining the exhaust gas temperature in a plurality of times;
a step of driving the first conveying device and the main conveying device in a plurality of times after only the main conveying device is stopped;
A method for igniting a combustion device, comprising:

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