JP2017161139A - Boiler device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict reduction in heat recovery efficiency accompanied by a continuation of long period operation.SOLUTION: A boiler device comprises a boiler 1 of fire tube structure including fire tubes 6 for flowing combustion gas 13 in a can body 2 where boiler water 3 is stored; and a cyclone 18 connected to a downstream side of a combustion gas discharging duct 17 of the boiler 1. An outside part of an outer cylinder 18a of the cyclone 18 is provided with a jacket 21. Boiler water 3 taken out of the can body 2 of the boiler 1 is passed in the jacket 21 of the cyclone 18 and then returned into the can body 2, thereby heat held by combustion gas 13 passing in the cyclone 18 is recovered into the boiler water 3. Since a speed of the combustion gas 13 is fast within the cyclone 18 and adhesion of ash dust 20 is restricted, a heat exchanging efficiency with the boiler water 3 of the jacket 21 can be restricted against its reduction for a long period of time. With this arrangement as above, the entire boiler water 3 causes a reduction in heat recovery efficiency accompanied with continuous operation to be restricted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a boiler apparatus including a boiler having a smoke tube structure.

  As a boiler, for example, a can that stores water (boiler water) includes a hollow combustion part such as a furnace tube and a plurality of smoke pipes connected to the combustion part. A boiler having a burner is known (see, for example, Patent Document 1). In such a type of boiler, a flame generated by burning fuel with a burner is introduced into the combustion section, and further, combustion gas generated along with this flame is led from the combustion section into each smoke pipe and discharged. During this time, in the boiler, the combustion gas and the water stored in the can are heat-exchanged through the wall surface of the combustion section and the tube wall of each smoke pipe, and the water in the can is heated to heat the combustion gas. Heat recovery of the heat it has is performed.

Incidentally, in recent years, it has been proposed to promote the use of renewable energy in order to reduce CO ₂ in the global warming problem. As one means for promoting the use of such renewable energy, so-called woody biomass powder made of wood or the like is being used as a fuel for a burner as a biomass fuel.

  By the way, when biomass fuel is used as the burner fuel, the amount of soot (ash) contained in the combustion gas is larger than when fossil fuel is used. Therefore, when a burner using biomass fuel is applied to a boiler, a boiler having a smoke tube structure in which no fins or the like are present in the combustion gas flow passage is suitable.

JP-A-10-185111

  However, in a boiler having a smoke tube structure, if dust adheres to the inner wall surface of the smoke tube due to continuous operation for a long time, heat recovery may be hindered by the adhered dust.

  Therefore, when using a boiler with a smoke tube structure, a countermeasure against a decrease in heat recovery efficiency associated with continued operation is desired. In particular, when biomass fuel is used as burner fuel in a boiler having a smoke tube structure, a countermeasure against a decrease in heat recovery efficiency accompanying continued operation becomes important.

  Then, this invention intends to provide the boiler apparatus which can suppress the fall of the heat recovery efficiency accompanying a driving | operation continuation in the structure provided with the boiler of the smoke pipe structure.

  In order to solve the above problems, the present invention provides a boiler including a can body in which boiler water is stored, a smoke pipe disposed in the can body, a discharge duct for guiding combustion gas to the outside from the boiler, A cyclone connected to the discharge duct, boiler water circulation means provided outside the outer cylinder of the cyclone, and circulation means for circulating boiler water between the boiler and the boiler water circulation means of the cyclone, A boiler device is provided.

  In the above-mentioned configuration, it comprises a dust box provided on the dust discharge side of the cyclone, and boiler water circulation means provided on the outside of the dust box, and the circulation means includes the boiler, boiler water circulation means of the dust box, and It is set as the structure provided with the function to circulate boiler water between the boiler water distribution means of the said cyclone.

  Further, in the above configuration, boiler water circulation means is provided outside the discharge duct, and the circulation means includes the boiler, the boiler water circulation means of the dust box, the boiler water circulation means of the cyclone, and the boiler of the exhaust gas duct. It is set as the structure provided with the function to circulate boiler water between water distribution means.

  According to the boiler apparatus of the present invention, it is possible to suppress a decrease in heat recovery efficiency associated with continuation of operation in a configuration including a boiler having a smoke tube structure.

It is an outline cutting side view of the boiler device of a 1st embodiment. It is a general | schematic cutting side view of the boiler apparatus of 2nd Embodiment.

  The present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic cut side view showing the boiler device of the first embodiment.

  As shown in FIG. 1, the boiler device of the present embodiment includes a boiler 1 having a smoke tube structure, a combustion gas discharge duct 17 connected to the outlet side of the combustion gas 13 of the boiler 1, and a downstream side of the combustion gas discharge duct 17. 1, a jacket 21 as a boiler water circulation means provided outside the cyclone 18, and a circulation means for circulating and supplying boiler water of the boiler 1 to the jacket 21. In addition, this embodiment demonstrates the example in case the boiler 1 is a hot water boiler.

  The boiler 1 includes a can body 2 in which boiler water 3 is stored, a combustion section 4 disposed in the can body 2, a plurality of smoke pipes 6, and a combustion gas collecting section 7, and is further attached to the combustion section 4. In addition, the burner 5 is provided. The boiler water 3 in the can body 2 is filled in each outer side of the combustion part 4, the smoke pipe 6 and the combustion gas collecting part 7. In FIG. 1, for convenience of illustration, the boiler water 3 in the can 2 is hatched with dots.

  The can body 2 in the present embodiment has a cylindrical shape extending vertically. The combustion part 4 is arranged at the lower part of the can body 2, and the combustion gas collecting part 7 is arranged at the upper part of the can body 2. Each smoke pipe 6 is arranged between the combustion part 4 and the combustion gas collecting part 7, and the lower end side and the upper end side are connected to the combustion part 4 and the combustion gas collecting part 7.

  The combustion part 4 is provided with a ceiling wall part 4a, a bottom wall part 4b, and a side wall part 4c, and is configured such that a space is formed therein.

  The combustion part 4 has a cylindrical shape smaller in diameter than the inner diameter of the cylindrical part of the can body 2. The ceiling wall portion 4 a of the combustion portion 4 projects outward from the outer peripheral surface of the side wall portion 4 c, and the outer peripheral surface of the ceiling wall portion 4 a is connected to the inner surface of the side wall of the can body 2. The outer peripheral edge of the ceiling wall 4a is provided with holes 4d penetrating in the vertical direction at a plurality of locations in the circumferential direction, and the boiler water 3 passes through the hole 4d in the vertical direction of the ceiling wall 4a. It is possible.

  A horizontal tubular member 8 is provided between one circumferential portion of the side wall portion 4c and the side wall of the can body 2 located on the outer peripheral side thereof. One end side (right end side in FIG. 1) of the cylindrical member 8 located near the center of the can body 2 is attached to the side wall portion 4c so as to communicate with the internal space of the combustion portion 4. The other end side (left end side in FIG. 1) of the cylindrical member 8 is attached so as to penetrate the side wall of the can body 2.

  The burner 5 is attached to the combustion unit 4 through the inside of the tubular member 8. In addition, it is preferable that the burner 5 is removable from the inner side of the cylindrical member 8 as needed.

  The burner 5 has a cylindrical combustion chamber 5a inside. One end side (left end side in FIG. 1) of the combustion chamber 5a in the axial direction is closed by an end wall 5b, and the other end side (right end side in FIG. 1) in the axial direction is opened to form a flame jet 5c. Yes. The burner 5 is inserted into the tubular member 8 on the flame jet outlet 5 c side, and the flame jet outlet 5 c is open (communication) toward the internal space of the combustion unit 4.

  Further, the burner 5 includes an air supply pipe 11 for supplying combustion air 10 to the combustion chamber 5a, and a pulverized fuel supply pipe 12 for supplying pulverized biomass fuel 9 as biomass fuel to the combustion chamber 5a. , And an ignition means (not shown).

  In this embodiment, as the biomass powder fuel 9, for example, the biomass biomass 9 obtained by pulverizing woody biomass so as to have an average particle size of about 100 μm is used. In addition, the conveyance of the pulverized biomass fuel 9 in the pulverized fuel supply pipe 12 may be performed by pneumatic transportation using a carrier gas such as air.

  A blower 14 is connected to the upstream side of the air supply pipe 11 via a combustion air line 15. The combustion air line 15 is provided with a flow rate adjusting valve 16 for adjusting the flow rate of the combustion air 10.

  The pulverized biomass fuel 9 supplied from the pulverized fuel supply pipe 12 to the combustion chamber 5a is combusted by the combustion air 10 supplied from the air supply pipe 11 to the combustion chamber 5a to form a flame.

  Therefore, the burner 5 can eject the flame formed by the combustion of the pulverized biomass fuel 9 from the flame ejection port 5c.

  Thereby, in the boiler 1, the flame ejected from the flame outlet 5 c of the burner 5 is blown into the combustion unit 4 together with the combustion gas 13.

  The combustion gas collecting part 7 has a hollow cylindrical shape with a smaller diameter than the inner diameter of the cylindrical part of the can body 2. The combustion gas collecting part 7 includes a bottom wall part 7a, a side wall part 7b, and a ceiling wall part 7c.

  The bottom wall portion 7 a projects outward from the outer peripheral surface of the side wall portion 7 b, and the outer peripheral surface of the bottom wall portion 7 a is connected to the inner surface of the side wall of the can body 2. The outer peripheral edge of the bottom wall portion 7a is provided with holes 7d penetrating in the vertical direction at a plurality of locations in the circumferential direction, and the boiler water 3 passes through the holes 7d in the vertical direction of the bottom wall portion 7a. Distribution is possible.

  One end side (the left end side in FIG. 1) of the combustion gas discharge duct 17 attached so as to penetrate the side wall of the can 2 on the outer peripheral side in the inner and outer direction is burned at one place in the circumferential direction of the side wall portion 7b. It is attached so as to communicate with the internal space of the gas collecting portion 7.

  The plurality of smoke pipes 6 are arranged in parallel between the combustion unit 4 and the combustion gas collecting unit 7 so as to extend in the vertical direction. The lower end side of each smoke pipe 6 is attached to the ceiling wall part 4 a of the combustion part 4 and connected to the internal space of the combustion part 4. Thereby, the ceiling wall part 4a becomes a header of the lower end side of each smoke pipe 6, and the combustion gas 13 in the combustion part 4 flows dispersedly in each smoke pipe 6.

  On the other hand, the upper end side of the smoke pipe 6 is attached to the bottom wall portion 7 a of the combustion gas collecting portion 7 and connected to the internal space of the combustion gas collecting portion 7. As a result, the bottom wall portion 7a becomes a header on the upper end side of each smoke tube 6, and the combustion gas 13 that has circulated through each smoke tube 6 enters and collects in the combustion gas collecting portion 7, and then the combustion gas discharge duct. 17 leads.

  Therefore, in the boiler 1, the combustion gas 13 and the boiler water 3 in the can 2 are heated through the wall surfaces of the combustion unit 4, the tube walls of the smoke tubes 6, and the wall surfaces of the combustion gas collecting unit 7. The boiler water 3 can be heated by exchanging the heat stored in the combustion gas 13 in the boiler water 3.

  In addition, since the boiler 1 is a hot water boiler, the preset temperature of the boiler water 3 heated in the can 2 is set to about 90 degreeC which does not boil.

  Moreover, although not shown in figure, the boiler 1 is suitably provided with a means for absorbing a change in dimensions accompanying a temperature change of each part during operation so that excessive stress concentration does not occur. In the figure, 25 is a means for supplying water into the can 2.

  A cyclone 18 is connected to the other end side (the right end side in FIG. 1) which is the downstream side of the combustion gas discharge duct 17.

  The cyclone 18 has an outer cylinder 18a whose upper part has a cylindrical shape and a lower part whose diameter is reduced downward, a ceiling wall 18b that closes the upper end side of the outer cylinder 18a, and a center of the ceiling wall 18b. And an inner cylinder 18c that is concentrically inserted from the upper part to the center of the outer cylinder 18a from above.

  The outer cylinder 18a has an opening at one location in the circumferential direction on the upper end side, and the other end side of the combustion gas discharge duct 17 is connected to the opening from a direction along a tangent line of the outer cylinder 18a. In FIG. 1, for convenience of illustration, a connection portion of the combustion gas discharge duct 17 with respect to the outer cylinder 18a is shown in a simplified manner. Thereby, in the cyclone 18, the combustion gas 13 which is guided from the boiler 1 through the combustion gas discharge duct 17 and flows into the outer cylinder 18a forms a swirling flow in the space 26 between the outer cylinder 18a and the inner cylinder 18c. .

  Due to this swirl flow, the soot and dust 20 contained in the combustion gas 13 is centrifuged in the space 26 based on the density difference from the gas. By this centrifugal separation process, the dust 20 is collected in the vicinity of the inner surface of the outer cylinder 18a serving as the outer peripheral portion of the space 26, falls along the inner surface of the outer cylinder 18a, and is discharged from the lower end side of the outer cylinder 18a. On the other hand, the exhaust gas 19 cleaned by removing the dust 20 contained in the combustion gas 13 by the centrifugal separation process moves to the inner peripheral side of the space 26 and enters the inner cylinder 18c from the lower end side of the inner cylinder 18c. It flows in and is discharged upward through the inner cylinder 18c.

  The combustion gas discharge duct 17 preferably has a configuration in which the flow path cross-sectional area on the other end side is narrower than the flow path cross-sectional area on the one end side. According to this configuration, in the cyclone 18, the flow velocity of the swirling flow of the combustion gas 13 formed in the space 26 can be further increased, and thus the separation performance of the dust 20 in the cyclone 18 can be further improved.

  A jacket 21 is provided outside the outer cylinder 18a and the ceiling wall 18b of the cyclone 18 in a region excluding the connection part of the combustion gas discharge duct 17 and the discharge part of the dust 20 on the lower end side in the outer cylinder 18a. The jacket 21 has an inlet 21a on the lower end side and an outlet 21b on the upper end side.

  Next, the circulation means will be described.

  The boiler 1 is provided near the upper end of the can body 2, for example, at a height corresponding to the upper end side of the smoke pipe 6. It is set as the structure by which the boiler water return port 2b was provided in the height position corresponding to a lower end side.

  One end side which becomes the upstream end of the circulation line 22 provided with the circulation pump 23 is connected to the boiler water outlet 2a. The other end, which is the downstream end of the circulation line 22, is connected to the inlet 21 a of the jacket 21. Further, one end side which is an upstream end portion of another circulation line 24 is connected to the outlet 21 b of the jacket 21. The other end, which is the downstream end of the circulation line 24, is connected to the boiler water return port 2 b of the boiler 1.

  Thereby, when the circulation pump 23 is operated, the boiler water 3 in the boiler body 2 of the boiler 1 is taken out from the boiler water outlet 2a, and this boiler water 3 is supplied to the inlet 21a of the jacket 21 through the circulation line 22. The The boiler water 3 supplied from the inlet 21a into the jacket 21 flows through the jacket 21 as a substantially upward flow toward the outlet 21b. Thereafter, the boiler water 3 that has reached the outlet 21b passes through the circulation line 24 from the outlet 21b, and then is returned into the can body 2 through the boiler water return port 2b.

  Accordingly, during operation of the circulation pump 23, the boiler water 3 taken out from the boiler 1 is continuously circulated and supplied to the jacket 21. For this reason, in the cyclone 18, the combustion gas 13 that flows into the outer cylinder 18 a from the combustion gas discharge duct 17 to form a swirling flow, the soot 20 contained in the combustion gas 13, and the boiler water that circulates in the jacket 21. 3, heat exchange can be performed via the wall surface of the outer cylinder 18 a.

  When using the boiler apparatus of this embodiment, the biomass biomass fuel 9 is burned with the burner 5, and the boiler 1 is drive | operated. In addition, the circulation pump 23 is operated to circulate the boiler water 3 taken out from the boiler 1 through the jacket 21 attached to the cyclone 18.

  As a result, in the boiler 1, the combustion gas 13 blown together with the flame from the burner 5 to the combustion section 4 passes through each smoke pipe 6 and flows to the combustion gas collecting section 7, and the combustion gas 13 and the can body Heat exchange with the boiler water 3 in 2 can be performed, and the boiler water 3 can be heated.

  After the heat exchange with the boiler water 3 stored in the can 2 is finished, the combustion gas 13 discharged from the combustion gas collecting portion 7 is supplied to the cyclone 18 through the combustion gas discharge duct 17.

  In the cyclone 18, the soot 20 contained in the combustion gas 13 is centrifuged and collected from the lower end side of the cyclone 18. The exhaust gas 19 that has been cleaned by separating the dust 20 is discharged upward through the inner cylinder 18c.

  Further, the combustion gas 13 flowing through the cyclone 18 is heat-exchanged with the boiler water 3 circulating through the jacket 21.

  At this time, as described above, in the boiler 1, the temperature of the boiler water 3 in the can 2 is set to about 90 ° C. For this reason, even if a temperature gradient in the vertical direction is generated in the boiler water 3 in the can body 2 due to convection, the boiler water 3 is taken out from the boiler water outlet 2a of the can body 2 and supplied to the jacket 21. The temperature of the boiler water 3 is about 90 ° C. even in the highest case.

  On the other hand, the combustion gas 13 introduced from the boiler 1 to the cyclone 18 through the combustion gas discharge duct 17 has a temperature of 200 ° C. to 300 ° C. even after being provided for heat exchange with the boiler water 3 in the boiler 1. have.

  Therefore, the boiler water 3 that circulates in the jacket 21 is heated by recovering the heat held by the combustion gas 13 that circulates in the cyclone 18.

  In addition, since the temperature of the boiler water 3 in the can 2 is low at the time of starting of the boiler 1, in the boiler 1, more heat which combustion gas 13 holds comes to be recovered in boiler water 3, Even in this case, the temperature of the combustion gas 13 guided from the boiler 1 to the cyclone 18 via the combustion gas discharge duct 17 quickly rises to 100 ° C. or higher. On the other hand, what is taken out from the boiler 1 and supplied to the jacket 21 is boiler water 3 in the process of being heated to about 90 ° C., which is a set temperature. Accordingly, in this case as well, the boiler water 3 that circulates in the jacket 21 is heated by recovering the heat held by the combustion gas 13 that circulates in the cyclone 18.

  Further, in the cyclone 18, the combustion gas 13 is introduced from the upper end side of the outer cylinder 18 a, so that the swirl flow formed in the space 26 by the combustion gas 13 gradually flows downward, but in the jacket 21. The direction in which the boiler water 3 flows is substantially upward. Thereby, the direction of the flow regarding the up-down direction of the combustion gas 13 and the boiler water 3 can be made to oppose, and the efficiency of heat exchange with the combustion gas 13 and the boiler water 3 can be improved.

  Moreover, in the cyclone 18, the flow speed of the combustion gas 13 is higher than the flow velocity in each smoke pipe 6. Therefore, in the cyclone 18, the combustion gas 13 whose temperature has decreased due to heat exchange with the boiler water 3 via the wall surface of the outer cylinder 18a does not stay inside the wall surface of the outer cylinder 18a. Therefore, in the cyclone 18, most of the heat transfer from the combustion gas 13 to the wall surface of the outer cylinder 18a can be performed by convection heat transfer.

  Therefore, even if the temperature of the combustion gas 13 flowing through the cyclone 18 is about 200 to 300 ° C. and is lower than the temperature of the combustion gas 13 flowing through the smoke pipe 6 in the boiler 1, the boiler. Heat exchange with the water 3 is promoted, and heat recovery from the combustion gas 13 to the boiler water 3 can be performed efficiently. According to the tests conducted by the present inventors, the result is that heat recovery can be performed such that the temperature of the combustion gas 13 flowing into the cyclone 18 is lowered from, for example, about 270 ° C. to 200 ° C. or less. Has been obtained.

  The boiler water 3 heated and recovered from the combustion gas 13 in the jacket 21 passes through the circulation line 24 from the outlet 21b of the jacket 21 and then returns to the can body 2 through the boiler water return port 2b.

  Therefore, according to the boiler apparatus of the present embodiment, the heat held by the combustion gas 13 can be efficiently recovered by the boiler water 3 in the can body 2 of the boiler 1, and the boiler water 3 can be recovered from the set temperature. It can be heated quickly.

  Furthermore, as described above, since the flow velocity of the combustion gas 13 is increased in the cyclone 18, even if the soot and dust 20 included in the combustion gas 13 adheres to the inner surface of the outer cylinder 18 a, the combustion gas 13. Is immediately blown away by the flow of water. Therefore, even if the boiler apparatus of the present embodiment is continuously operated for a long period, the soot and dust 20 is prevented from growing on the inner surface of the outer cylinder 18a of the cyclone 18. Further, even when condensation occurs on the inner surface of the outer cylinder 18a when the combustion gas 13 is heat exchanged with the boiler water 3 via the wall surface of the outer cylinder 18a, the condensation is blown off by the fast flow of the combustion gas 13. Can be removed. Therefore, this also prevents the soot 20 from adhering to the inner surface of the outer cylinder 18a of the cyclone 18 and growing.

  Therefore, in the boiler apparatus of this embodiment, since the fall of the heat exchange efficiency with the combustion gas 13 which distribute | circulates the inside of the cyclone 18 and the boiler water 3 which distribute | circulates the inside of the jacket 21 can be suppressed over a long period of time, Even if dust adheres to the inner wall surface of the smoke pipe 6 in the boiler 1, the boiler apparatus as a whole can suppress a decrease in the efficiency of heat recovery from the combustion gas 13 as the operation continues.

  Moreover, in the present embodiment, along with the operation of the circulation pump 23, the boiler water 3 taken out from the boiler water outlet 2a near the upper end of the can body 2 is heated by the jacket 21, and then the boiler near the lower end of the can body 2 is used. Since the water is forcibly returned to the water return port 2b, the boiler water 3 in the can body 2 can be stirred, and a vertical temperature gradient is formed in the boiler water 3 in the can body 2. Can be suppressed.

[Second Embodiment]
FIG. 2 shows the boiler apparatus of the second embodiment. In FIG. 2, the same components as those shown in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The boiler apparatus of the present embodiment has a configuration similar to that of the first embodiment, and a dust box 27 that collects the dust 20 is provided on the lower end side of the cyclone 18. Furthermore, jackets 28, 29, and 30 as boiler water circulation means are attached to the outside of the inner cylinder 18c of the cyclone 18, the dust box 27, and the portion of the combustion gas discharge duct 17 protruding outward from the can body 2. ing.

  The jacket 29 outside the dust box 27 may be configured to directly communicate with the jacket 21 provided on the outer cylinder 18a of the cyclone 18, or the jacket 29 and the jacket 21 may be independently communicated with each other through a circulation line (not shown). Good. FIG. 2 shows a configuration in which the jacket 29 is in direct communication with the jacket 21.

  In the present embodiment, the circulation line 22 including the circulation pump 23 is connected to an inlet 29 a provided on the bottom surface of the jacket 29.

  The outlet 21b of the jacket 21 is connected to the inlet 28a of the jacket 28 of the inner cylinder 18c through a circulation line 31. An outlet 28 b of the jacket 28 is connected to an inlet 30 a of the jacket 30 of the combustion gas discharge duct 17 via a circulation line 32. An outlet 30 b of the jacket 30 is connected to a boiler water return port 2 b of the boiler 1 by a circulation line 24. Thus, when the circulation pump 23 is operated, the boiler water 3 taken out from the boiler water outlet 2a of the boiler 1 is supplied to the circulation line 22, the jacket 29 of the dust box 27, the jacket 21 of the outer cylinder 18a of the cyclone 18, and the inner cylinder 18c. After flowing in the order of the jacket 28 and the jacket 30 of the combustion gas discharge duct 17, it circulates back to the boiler water return port 2b.

  For this reason, in the boiler apparatus of this embodiment, when the boiler water 3 distribute | circulates the jacket 29 in addition to the heat recovery in the outer jacket 21 of the outer cylinder 18a of the cyclone 18, it is discharged from the cyclone 18 to the dust box 27. The heat held by the high temperature dust 20 can be recovered. Further, when the boiler water 3 flows through the jacket 28, the heat remaining in the exhaust gas 19 flowing through the inner cylinder 18c of the cyclone 18 can be recovered. Furthermore, when the boiler water 3 flows through the jacket 30, heat can be recovered from the combustion gas 13 flowing through the combustion gas discharge duct 17.

  Therefore, according to the boiler apparatus of this embodiment, in addition to the effect similar to 1st Embodiment, the heat recovery efficiency to the boiler water 3 can be improved more.

  In addition, this invention is not limited to the thing of each above-mentioned embodiment, The boiler 1 is provided with the smoke pipe structure, and produces | generates the combustion gas 13 containing the dust 20 by combustion of the fuel in the burner 5 If it is. For example, the boiler 1 may include a burner that uses fuel other than the powdered biomass fuel 9.

  Moreover, the size of each component apparatus, such as the can 2, the combustion part 4, the combustion gas collection part 7, the smoke pipe 6, and the burner 5 in the boiler 1, those dimensions, and the number of the smoke pipes 6 are the convenience for illustration. It does not reflect the actual device configuration.

  In the boiler 1, the can body 2, the combustion section 4, and the combustion gas collecting section 7 are preferably formed in a cylindrical shape in order to have a pressure resistant structure, but may have any shape other than the cylindrical shape.

  If the boiler 1 has a smoke tube structure, the arrangement of the combustion part 4 and the combustion gas collecting part 7 in the can 2, the shape of the smoke pipe 6, and the direction in which the smoke pipe 6 is arranged are arbitrary other than those shown in the figure. The configuration may be adopted.

  In the second embodiment, in addition to the jacket 21 provided outside the outer cylinder 18a of the cyclone 18, the inner cylinder 18c, the dust box 27, and the combustion gas discharge duct 17 of the cyclone 18 are also provided with jackets 28, 29, and 30. Although the case where the water 3 is circulated has been shown, in addition to the jacket 21, any one or two of the jackets 28, 29, and 30 may be provided. Even if it does in this way, compared with 1st Embodiment, the heat recovery from any of the soot 20 in the dust box 27, the waste gas 19 which distribute | circulates the inner cylinder 18c, and the combustion gas 13 which distribute | circulates the combustion gas discharge duct 17 is carried out. Since an effect can be added, heat recovery efficiency can be improved as compared with the first embodiment.

  In the second embodiment, the configuration in which all the jackets 29, 21, 28, 30 are connected in series is shown. However, the jackets 29, 21, 28, 30 are divided into several groups, or It is good also as a structure connected to the boiler water intake 2a and the boiler water return port 2b of the boiler 1 through the circulation line separately.

  The circulation pump 23 may be arranged at an arbitrary position as long as it is on a path for circulating the boiler water 3 between the boiler 1 and the jackets 21, 28, 29, 30.

  In each embodiment, although each jacket 21, 28, 29, 30 was illustrated as a boiler water distribution | circulation means, the boiler water distribution | circulation means is good also as a structure which wound the pipe | tube which distribute | circulates the boiler water 3 helically. In this case, a spirally wound tube is arranged along the outer surface of the object to which the boiler water circulation means is attached, and the outer surface of the object is surrounded by adjacent portions of the spirally wound tube. The gap formed in this way may be filled with a filler having good thermal conductivity. In this case, if the pipe has a pressure-resistant structure, the boiler 1 may be a steam boiler.

  You may make it cover the outer side of a boiler water distribution means with a heat insulating material.

  It goes without saying that various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Boiler 2 Can body 3 Boiler water 6 Smoke pipe 7 Combustion gas collection part 9 Powder biomass fuel 11 Air supply pipe 12 Powder fuel supply pipe 13 Combustion gas 17 Combustion gas discharge duct (discharge duct)
18 Cyclone 18a Outer cylinder 21 Jacket (Boiler water distribution means)
22 Circulation line (circulation means)
23 Circulation pump (circulation means)
24 Circulation line (circulation means)
27 Dust box 29 Jacket (Boiler water distribution means)
30 Jacket (Boiler water distribution means)
31 Circulation line (circulation means)
32 Circulation line (circulation means)

Claims (3)

A boiler comprising a can body in which boiler water is stored, and a smoke pipe disposed in the can body;
An exhaust duct for guiding combustion gas to the outside from the boiler;
A cyclone connected to the discharge duct;
Boiler water circulation means provided outside the outer cylinder of the cyclone,
A boiler device comprising: circulation means for circulating boiler water between the boiler and the boiler water circulation means of the cyclone. A dust box provided on the dust discharge side of the cyclone;
Boiler water circulation means provided outside the dust box,
The boiler device according to claim 1, wherein the circulation unit has a function of circulating boiler water between the boiler, a boiler water circulation unit of the dust box, and a boiler water circulation unit of the cyclone. A boiler water circulation means is provided outside the discharge duct,
The said circulation means is provided with the function to circulate boiler water between the boiler, the boiler water circulation means of the said dust box, the boiler water circulation means of the said cyclone, and the boiler water circulation means of the said exhaust gas duct. Boiler equipment.

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