JP6663233B2 - Nori making machine - Google Patents

Description

The present invention relates to a seaweed making machine to produce a dried edible seaweed.

  2. Description of the Related Art As a laver production machine for producing a thin sheet of dry laver, one having a drying chamber in addition to a paper making section, a dehydrating section, and a peeling section is widely known. In the method for producing dry laver using such a laver production machine, while moving the cage holder holding the cage by an endless chain, the raw laver is thinly made on the cage in the paper making section, and then the cage holder is dewatered. After the raw seaweed on the pond is dehydrated by air suction, it is further dewatered by press. The raw seaweed after press dewatering is sent to the drying chamber, and is exposed to high-temperature air while being conveyed by the conveyor in the drying chamber. As a result, the raw seaweed is dried, and then the dried seaweed (dried seaweed) is peeled off from the pond at the peeling part. The stripped dry laver is carried out from a laver maker.

  Air heated by a heating device provided at an adjacent position is sent into the drying chamber. More specifically, the heating device includes a pipe into which high-temperature combustion gas generated by burning heavy oil or the like is fed. The air taken in from the outside of the drying chamber is heated by being blown to the tube burned by the fan, and is sent to the drying chamber. Further, the combustion gas from which heat has been removed is exhausted from the chimney via a pipe to the outside of the drying chamber as used exhaust gas after work, but the exhaust gas is considerably hot. Therefore, a heat recovery apparatus that recovers and reuses thermal energy from exhaust gas is used. For example, in a laver manufacturing machine, a heat recovery device that heats outside air taken into a heating device by heat recovered from exhaust gas is used (for example, see Patent Document 1).

  Patent Document 1 exemplifies a heat recovery device (heat exchange element) in which a plurality of metal plates are inserted in parallel in a direction along the flow of the exhaust gas in a pipe for guiding the exhaust gas to a chimney. In this heat recovery device, exhaust gas is taken in every other space partitioned by each plate and flows upward, and outside air is taken in every other space and flows in a direction orthogonal to the combustion gas. . As a result, heat is removed from the exhaust gas by each plate, and outside air is warmed by the removed heat, that is, heat exchange is performed.

Japanese Utility Model Publication No. 57-189394

  However, in the prior art shown in Patent Document 1, a heat recovery device is disposed in a vertically extending pipe for discharging exhaust gas, and a duct for flowing outside air is supplied to the heat recovery device in a horizontal direction so that the outside air flows orthogonally. In addition, since there is a partition wall between the outside air and the exhaust gas, the structure of the heat recovery device and the peripheral equipment including the duct connected to the heat recovery device is complicated, and the heat from the exhaust gas can be There was a problem that it could not be collected and reused. Further, in the heat recovery device of Patent Literature 1, heat exchange is performed by a partition wall that separates outside air and exhaust gas, but there is a problem that a heat exchange rate is low.

Then, an object of the present invention is to provide a laver manufacturing machine which can recover heat from used combustion gas and reuse it with a simple structure.

The seaweed production machine of the present invention, a paper making unit for making raw nori on the cage of a cage holder holding a plurality of cages, and a dewatering unit for dehydrating the raw nori made by the paper making unit A drying unit for drying the raw seaweed dehydrated by the dewatering unit, an air heating unit for generating heated air and supplying the dried seaweed to the drying unit, and a peeling unit for peeling off the dried dry seaweed from the cage. Wherein the air heating unit includes a combustion gas generation unit that generates a combustion gas, and an outlet that discharges the combustion gas generated by the combustion gas generation unit to outside the drying unit. A heat recovery device that recovers heat from the combustion gas supplied to the tube, and heats air taken in from the outside of the drying unit by the recovered heat, and air heated by the heat recovery device. Sprayed onto the tube, And a heated air delivery means for feeding the drying section heated air that is, the heat recovery device comprises a plurality of tubular members separate the heat medium is housed in the space, the tubular A lower portion of the member is provided on a passage through which the combustion gas supplied to the pipe is directed to the outlet, and constitutes a heat receiving portion that receives heat from the combustion gas. An upper portion of the tubular member includes the heat receiving portion. And a heat radiating unit for releasing the heat received by the air to the air taken in from outside the drying unit.

  According to the present invention, heat can be recovered and reused from used combustion gas with a simple structure.

Side view schematically showing a laver production machine in Embodiment 1 of the present invention. Sectional drawing which showed typically the inside of the hut where the laver manufacturing machine in Embodiment 1 of this invention was installed. Partial plan view of a cage and a cage holder for holding the cage used in the laver production machine according to Embodiment 1 of the present invention. Structure explanatory diagram of the air heating device provided in the laver manufacturing machine in Embodiment 1 of the present invention The side view which shows typically the pipe which comprises the air heating apparatus with which the laver manufacturing machine in Embodiment 1 of this invention is provided (A) Side view (b) Front view (c) Plan sectional view of the heat recovery device in Embodiment 1 of the present invention FIG. 2A is a front view of the outside air intake surface on which the flow straightening plate provided in the heat recovery device according to Embodiment 1 of the present invention is arranged, and FIG. 2B is a partial cross-sectional view along the outside air flow. (A) Plan view (b) Partial enlarged view of plane (c) Partial enlarged view of modified example of plate-shaped member provided in heat recovery device according to Embodiment 1 of the present invention Structure explanatory diagram of the air heating device provided in the laver manufacturing machine in Embodiment 2 of the present invention

(Embodiment 1)
First, a laver maker according to Embodiment 1 of the present invention will be described with reference to FIGS. The laver production machine 1 produces a thin sheet of dry laver, and includes a front section 2 and a drying chamber 3 disposed behind the front section 2 (on the right side of the drawing in FIG. 1). The laver production machine 1 is installed in a hut 4 shown in FIG. The front section 2 includes an endless chain 5, a paper making section 6, a dewatering section 7, a stripping section 8, and a washing section 9 arranged along the endless chain 5.

  The endless chain 5 functions as a transport unit that transports the frame-shaped cage holder 11 holding the plurality of cages 10 shown in FIG. 3 to the paper making unit 6, the dewatering unit 7, the stripping unit 8, and the washing unit 9. In addition, various structures may be used for the conveying means. Hereinafter, the direction in which the endless chain 5 transports the cage holder 11 from the paper making unit 6 to the dewatering unit 7 (the left-right direction on the paper surface of FIG. 1) is the X direction, and the direction orthogonal to the X direction in the horizontal plane (FIG. The Y direction is defined as the Y direction, and the Z direction is defined as the height direction orthogonal to the XY plane (the vertical direction of the paper surface in FIG. 1).

  The paper making unit 6 makes raw laver w (see FIGS. 2 and 3) on the cage 10. In the present specification, the operation of making the raw laver w is referred to as “paper making”. The dehydrating unit 7 dehydrates the raw laver w prepared on the cage 10 by air suction, and further press-dehydrates. Thereby, the raw laver w on the cage 10 is formed into a sheet.

  The cage holder 11 holding the dehydrated raw laver w is moved from the former part 2 to the drying chamber 3. A plurality of (here, two) endless chains 12 are arranged in the drying chamber 3 at predetermined intervals in the vertical direction, and the cage holder 11 is moved from the endless chain 5 of the front section 2 to the upper stage of the drying chamber 3. Transfer to the endless chain 12. At this time, the cage holder 11 is carried in between the plurality of supporting bones 12a erected on the endless chain 12 (arrow a1), and in this state, the upper endless chain 12 and the lower endless chain 12 are moved through the drying chamber 3 in the drying chamber 3. Are transported in order (arrows a2 to a5). During this time, the raw laver w on the cage 10 is dried by being exposed to high-temperature air. The cage holder 11 holding the dried laver (dried laver) is transferred from the lower endless chain 12 to the endless chain 5 of the front section 2 (arrow a6) and transported to the stripping section 8. The stripping section 8 strips the sheet-shaped dry laver from the cage 10. The cleaning unit 9 cleans the cage 10 from which the dried seaweed has been removed. The cage holder 11 holding the washed cage 10 is transported again to the paper making unit 6 (arrow a7).

  In FIG. 2, a first opening 13 is formed along a longitudinal direction of the endless chain 12 at a position below one end wall 3 a of the drying chamber 3 and below the lower endless chain 12. I have. Air heated by a heating device 17 described below (hereinafter, referred to as “heated air”) is supplied to the drying chamber 3 through the first opening 13. The raw laver w is gradually dried while being conveyed by the endless chain 12 while being exposed to the heated air.

  As described above, the laver production machine 1 includes the paper laminating unit 6 for producing the raw laver w on the cage 10 of the cage holder 11 holding the plurality of cages 10, and the raw laver produced by the laminating unit 6. a drying unit (drying chamber 3) for drying the raw seaweed w dehydrated by the dewatering unit 7, and an air heating unit (heating device) that generates heated air and supplies it to the drying unit. 17), and a peeling unit 8 for peeling the dried dry laver from the cage 10.

  Next, the structure of the hut 4 will be described with reference to FIG. A plurality of (here, two) exhaust fans 14 as first fans are installed on the ceiling of the hut 4. The exhaust fan 14 discharges the heated air blown up from the drying chamber 3 to the outside. Note that the discharged heated air has high humidity because it contains moisture taken from the raw laver w. An outside air inlet 15 is provided in one side wall 4a of the hut 4, and outside air having a low temperature and a low humidity is introduced into the hut 4 through the outside air inlet 15 in winter (arrow b).

  2 and 4, a space 16 for heating the air to be supplied to the drying chamber 3 is provided inside the cabin 4 at a position adjacent to the drying chamber 3 with the side wall 3a of the drying chamber 3 interposed therebetween. Is provided. A part of the space 16 is surrounded by a plurality of walls including a side wall 3a of the drying chamber 3 and an inner wall 4b provided in the cabin 4 at a predetermined interval from the side wall 3a. The main part of the heating device 17 is arranged in this space 16. FIG. 4 schematically shows a section taken along line KK shown in FIG. 2 and 4, the heating device 17 has a function of supplying heated air to the drying chamber 3, and includes a burner 18, a first tube 19A bent in a U shape in a side view, The second tube 19B is connected to the first tube 19A via the connecting portion 20 and bent at a plurality of locations, and includes a plurality (three in this case) of intake fans 21 as second fans. You.

  The burner 18 constitutes combustion gas generating means for generating high-temperature combustion gas by burning heavy oil, kerosene, gas fuel, and the like, and has a discharge port 18a for discharging the combustion gas. The discharge port 18a communicates with the first pipe 19A. The first tube 19 </ b> A is formed of a metal having high thermal conductivity, and forms a passage (flow passage) for the combustion gas generated by the burner 18. The first tube 19A is configured by connecting a plurality of tubes parallel in the vertical direction. As shown in FIG. 5, the flow path of the combustion gas in the first pipe 19A includes a first section A extending in the X direction below the space 16 and a second section A extending upward from the end of the first section A. The section B is divided into a plurality of sections (here, two hands) from the end of the second section B and a plurality of sections (here, two) of third sections C which are folded back along the first section A. It should be noted that the number of pipes disposed above the first section A may be one, and in this case, the number of the third section C is only one. The end of the first tube 19A corresponding to the third section C extends from one side (that is, the space 16) of the side wall 3a to an outer position (FIG. 4), and the first tube 19A is connected to the first tube 19A via the connecting portion 20 at that position. It is connected to the second tube 19B. The surface of the first tube 19A is heated to a high temperature by the combustion gas supplied to the inside.

  The second pipe 19B guides the combustion gas that has passed through the first pipe 19A and the connecting portion 20 to the chimney 22. As shown in FIG. 5, the flow path of the combustion gas in the second pipe 19 </ b> B is divided into a fourth section D extending upward from the connecting portion 20 and a fifth section E extending substantially horizontally from the end of the fourth section D. Is divided into the sixth section F reaching the chimney 22 from the fifth section E. 4 and 5 illustrate a boundary between the second pipe 19B and the chimney 22. The combustion gas discharged from the discharge port 18a of the burner 18 passes in the order of the first section A to the sixth section F (see a plurality of arrows shown in FIG. 5). The chimney 22 has an outlet 22a arranged outside the hut 4, and the combustion gas guided to the chimney 22 from the second pipe 19B goes out of the hut 4 (that is, the drying chamber 3) through the outlet 22a. Discharge. As described above, the tube including the first tube 19A and the second tube 19B guides the combustion gas generated by the combustion gas generation means to the outlet for discharging the combustion gas to the outside of the drying chamber 3. The combustion gas may be led to the chimney 22 by a single pipe instead of a plurality of pipes.

  In FIG. 4, a plurality of intake fans 21 are arranged in parallel in the X direction above the first pipe 19 </ b> A, and suck air in the cabin 4 to arrange the first pipe 19 </ b> A ( (Here, downward) (arrow c). The air blown to the first pipe 19A takes heat from the combustion gas present therein through the first pipe 19A to become high temperature. As a result, heated air is generated, and thereafter, the heated air is supplied to the lower portion of the drying chamber 3 through the first opening 13 by the intake fan 21 (arrow d). Further, the combustion gas whose heat has been removed is discharged from the chimney 22 to the outside of the cabin 4 as used exhaust gas.

  As shown in FIG. 2, the heated air sent to the drying chamber 3 from the space 16 in which the heating device 17 is arranged is blown up (arrow e), and deprives the raw laver w spread on the cage 10 of water. A portion of the heated air that has blown up is discharged out of the hut 4 by the exhaust fan 14 (arrow f). Above the side wall 3a of the drying chamber 3, a second opening 23 for communicating the drying chamber 3 with the space 16 is formed. A part of the heated air that blows up in the drying chamber 3 is returned to the space 16 through the second opening 23 (arrow g).

  2 and 4, a duct 24 extending in the X direction is provided above the intake fan 21. In FIG. 4, an opening 24a for taking in air that has entered the hut 4 via the outside air inlet 15 is provided at one end of the duct 24 and above the second pipe 19B corresponding to the fifth section E. Are formed. A plurality of openings 24b are formed on the lower surface of the duct 24 facing the intake fan 21. The air in the hut 4 is sent into the duct 24 from the opening 24a (arrow h shown in FIG. 4), and further sent to the space 16 (above the intake fan 21) via the opening 24b (see FIG. 4). Arrow i) shown. Therefore, the intake fan 21 blows the air sent to the space 16 through the duct 24 and a part of the heated air sent from the drying chamber 3 toward the first pipe 19A. As described above, a part of the second pipe 19B that is a passage of the combustion gas (exhaust gas) and a part of the duct 24 that is the passage of the air to be heated by the heating device 17 are vertically (horizontally). May be adjacent).

  In FIG. 4, a heat recovery device 30 is provided at a position away from the space 16 in the hut 4. The heat recovery device 30 has a function of removing heat from the combustion gas (exhaust gas) in the second pipe 19B and recovering the same, and heating the air sent into the duct 24 by the recovered heat. That is, the laver manufacturing machine 1 includes an air heating unit (heating device 17) that generates heated air and supplies the air to the drying unit. Then, the air heating unit (heating device 17) discharges the combustion gas generated by the combustion gas generation means (burner 18) for generating the combustion gas and the combustion gas generated by the combustion gas generation means to the outside of the drying unit (drying chamber 3). A pipe (first pipe 19A and second pipe 19B) leading to the discharge port 22a and heat for collecting heat from the combustion gas supplied to the pipe and warming air taken in from outside the drying unit by the recovered heat. The recovery device 30 and a heated air supply unit (a fan for intake air) for blowing air heated by the heat recovery device 30 onto a pipe (first pipe 19A) and supplying generated heating air to the drying unit. 21).

  Next, referring to FIGS. 6A, 6B and 6C, a detailed structure of the heat recovery device 30 will be described. FIG. 6C illustrates an SS cross section illustrated in FIG. 5A. The heat recovery device 30 is mainly composed of a housing 31, and has a plurality of tubular members 32 extending vertically (Z direction) in a staggered arrangement inside. The tubular member 32 has a closed space (so-called hollow) extending in the longitudinal direction inside the tubular member 32, and a heat medium is stored in the space inside the tubular member 32. The tubular member 32 is formed of a metal having high thermal conductivity or the like. The plurality of tubular members 32 may be provided so as to extend in directions other than perpendicular to the horizontal plane, and may have an arrangement other than the staggered arrangement.

  In FIG. 4, in the heat recovery device 30 according to Embodiment 1, the upper part of the housing 31 covers the entire surface of the opening 24 a of the duct 24, and the lower part of the housing 31 corresponds to the fifth section E. The tube 19B is attached so as to cover a space provided by removing a part of the tube 19B. The casing 31 is provided with a partition plate 33 for partitioning a flow path of air sent into the duct 24 and a flow path of combustion gas sent to the second pipe 19B. In the vertical direction. This prevents a situation in which air sent into the duct 24 enters the second pipe 19B or exhaust gas (combustion gas) in the second pipe 19B enters the duct 24. In the present embodiment, the partition plate 33 is disposed horizontally. Hereinafter, a portion of the housing 31 below the partition plate 33 is referred to as a “lower portion 31a of the housing 31”, and a portion of the housing 31 above the partition plate 33 is referred to as an “upper portion 31b of the housing 31”. Note that the lower portion 31a and the upper portion 31b of the housing 31 may be prepared separately, and the upper portion of the lower portion 31a and the lower portion of the upper portion 31b may be joined to form one housing 31.

  In FIG. 6A, in the front-rear direction of the lower portion 31a of the housing 31 (the left-right direction in FIG. 4 and FIG. 6), a pipe 34A for introducing combustion gas and a pipe for discharging combustion gas open at both ends. 34B are provided. One end 34Aa of the pipe 34A for introducing the combustion gas is connected to the cut end of the second pipe 19B on the upstream side (left side in FIG. 4 and FIG. 6). In addition, one end 34Ba of the pipe 34B for discharging the combustion gas is connected to the cut end of the second pipe 19B on the downstream side (right side of the paper surface in FIGS. 4 and 6). Further, the front-rear surface of the lower portion 31a of the housing 31 and the areas facing the other end 34Ab of the pipe 34A for introducing the combustion gas and the other end 34Bb of the pipe 34B for discharging the combustion gas are open. (That is, the region from the partition plate 33 to the other end 34Ab of the combustion gas introduction tube 34A and the region from the partition plate 33 to the other end 34Bb of the combustion gas discharge tube 34B are closed. There). That is, the pipe 34A for introducing the combustion gas, the pipe 34B for discharging the combustion gas, and the lower portion 31a of the housing 31 are replaced with the second pipe 19B which has been removed, and the second pipe 19B which remains without being removed. A flow path of the combustion gas connected to the pipe 19B is formed. Thus, the combustion gas can be guided to the chimney 22 without leaking to the hut 4.

  As shown in FIG. 6A, in the upper portion 31b of the housing 31, one surface G1 facing the opening 24a of the duct 24 and the other surface G2 opposite to the opening 24a are open. I have. Therefore, the air in the hut 4 is taken into the upper part 31 b of the housing 31 from the other surface G <b> 2 side, and is further sent into the duct 24. That is, the other surface G2 is an air intake surface. In the upper portion 31b of the housing 31, on one surface G1 side, a feeding fan 37 as a third fan whose axis 35 rotates about a horizontal rotating boss 36 is located inside the duct 24. It is provided in a state. The sending fan 37 forcibly sends the air in the hut 4 into the duct 24. The feed fan 37 is not limited to the above-described configuration, and may be, for example, a sirocco fan, or may be provided on the other surface G2 side of the upper portion 31b of the housing 31. It may be provided in the duct 24 remote from the upper portion 31b.

  In FIG. 6A, a portion of the tubular member 32 that extends downward from the partition plate 33 (hereinafter, referred to as a “lower portion 32a of the tubular member 32”) reaches the inside of the flow path of the combustion gas. That is, from the front surface of the lower part 31a of the casing 31 facing the other end 34Ab of the pipe 34A for introducing the combustion gas, the lower part 31a of the casing 31 facing the other end 34Bb of the pipe 34B for discharging the combustion gas. A portion between the rear surfaces is a passage portion that is a passage of the combustion gas through which the combustion gas flows, and a lower portion 32a of the tubular member 32 is located inside the passage portion. Therefore, the lower portion 32a of the tubular member 32 is exposed to the combustion gas (exhaust gas), and directly receives heat from the combustion gas. That is, the lower portion 32a of the tubular member 32 is provided on a passage where the combustion gas supplied to the tubes (the first tube 19A and the second tube 19B) is directed to the outlet 22a (of the chimney 22). A heat receiving unit that receives heat from the When the lower portion 32a of the tubular member 32 receives heat from the combustion gas, the heat medium contained in the tubular member 32 boils and changes from a liquid to a gas. In the first embodiment, the inside of the tubular member 32 is decompressed to lower the boiling point of the heat medium, thereby efficiently vaporizing the heat medium.

  A portion of the tubular member 32 extending upward from the partition plate 33 (hereinafter, referred to as an “upper portion 32b of the tubular member 32”) has reached a height position facing the opening 24a of the duct 24. Therefore, the upper portion 32b of the tubular member 32 is exposed to the air in the cabin 4. The heat medium that has received heat from the combustion gas at the lower portion 32a of the tubular member 32 and has become a gas moves to the upper portion 32b of the tubular member 32 and releases heat to the surrounding air, and then condenses into a liquid. Change. That is, the upper portion 32b of the tubular member 32 constitutes a heat radiating portion that releases the heat received by the heat receiving portion (the lower portion 32a of the tubular member 32) to air taken in from outside the drying portion (the drying chamber 3). The heat medium that has returned to the liquid returns from the upper portion 32b of the tubular member 32 to the lower portion 32a of the tubular member 32. That is, the heat medium is housed in a sealed tubular member that straddles the heat receiving section and the heat radiating section, and the heat recovery device 30 receives the heat medium by the heat receiving section by the heat medium that is movable between the heat receiving section and the heat radiating section. Transfers heat to the radiator. Thus, by transmitting heat by the heat medium, heat can be efficiently transmitted from the heat receiving section to the heat radiating section.

  A plurality of flat plate-shaped radiating fins 38 extending in the horizontal direction are arranged at predetermined intervals in the vertical direction in the upper portion 32b of the tubular member 32. Each radiating fin 38 has an opening (not shown) corresponding to the cross-sectional shape of the tubular member 32, and the upper portion 32 b of the tubular member 32 penetrates the radiating fin 38. Thereby, the tubular member 32 and the radiating fin 38 are joined without any gap so that heat is conducted from the upper portion 32b of the tubular member 32 to the radiating fin 38. That is, the heat radiating portion (the upper portion 32b of the tubular member 32) has fins for radiating heat (radiating fins 38). Thus, the effective area of the heat radiating portion in contact with the air can be increased, and heat can be efficiently released from the heat radiating portion to the surrounding air. In addition, the shape and the mounting mode of the radiation fins 38 may be arbitrary.

  6 and 7, a plurality of (four in this case) rectifying plates 39 are provided on the air intake surface side of the upper portion 31b of the housing 31. FIG. 7B shows a TT cross section (FIG. 7A) of the air intake surface as viewed from the front. In FIG. 7A, the illustration of the tubular member 32 and the radiation fins 38 is omitted for convenience. In FIG. 7A, a plurality of flow straightening plates 39 are arranged in a substantially X shape when the air intake surface is viewed from the front. In the air intake plane, the center 40 of the region surrounded by the plurality of flow straightening plates 39 is located on substantially the same straight line as the axis 35 of the rotating boss 36. In FIG. 7B, the current plate 39 includes an upright portion 39a that stands upright with respect to the air intake surface, and a bent portion 39b that is bent from an end of the upright portion 39a opposite to the outside air intake surface. Be composed. The bent portion 39b is provided so as to face in the same circumferential direction with respect to the center 40.

  The air supplied to the air intake surface by the fan 37 for air supply is rectified by the plurality of rectifying plates 39 so as to flow in a distributed manner over the entire area of the air intake surface. That is, the laver manufacturing machine 1 is provided with an air feeding means (a feeding fan 37 as a third fan) for feeding air to the heat radiating portion (the upper portion 32b of the tubular member 32), and a plurality of rectifiers. The plate 39 is a rectifying unit that regulates the flow of the air supplied to the heat radiating unit by the air supplying unit. As a result, the air supplied to the upper portion 32b of the tubular member 32 does not shift with respect to the air intake surface, and evenly strikes the upper portion 32b of the tubular member 32 and all the radiating fins 38. The efficiency of releasing heat is improved. Note that the rectifying means is not limited to the above-described configuration using the rectifying plate 39, but may be any as long as it can regulate the flow of air supplied to the heat radiating unit by the fan 37 for feeding. May be installed on the side of the fan 37.

  Next, a specific operation of the heat recovery device 30 will be described. While the combustion gas (exhaust gas) passes through the second pipe 19B, the lower portion 32a (heat receiving portion) of the tubular member 32 receives heat from the combustion gas. Due to the received heat, the heat medium stored inside the tubular member 32 rises in temperature and evaporates (evaporates) when it reaches the boiling point.

  The vaporized heat medium moves (ups) to the upper portion 32b (heat radiating portion) of the tubular member 32. The upper portion 32b of the tubular member 32 and the radiating fins 38 receive heat from the heat medium and radiate the heat to the surrounding air. As a result, the air passing through the upper portion 31b of the housing 31 is heated by the upper portion 32b of the tubular member 32 and the radiation fins 38 and is sent into the duct 24. The heat medium that has transferred the heat condenses and returns to the liquid, and falls to the lower portion 32a of the tubular member 32. By adopting such a structure, heat can be recovered from used combustion gas (exhaust gas) and reused with a simple structure.

  As described above, the heat recovery device 30 includes the passage portion that is the passage of the combustion gas, the heat receiving portion (the lower portion 32a of the tubular member 32) that is provided inside the passage portion and receives heat from the combustion gas, A heat radiating portion (upper portion 32b of the tubular member 32) which is provided outside and radiates the heat received by the heat receiving portion to the surroundings; Warm the surrounding air at. Since the heat recovery device 30 has a structure in which the heat receiving portion and the heat radiating portion are integrally arranged in the housing 31, it can be easily attached to the flow path of the combustion gas. For example, in the case of the laver production machine 1 shown in FIG. 4, an opening for accommodating the housing 31 is provided at the upper part of the second pipe 19B, and the heat recovery device 30 can be easily installed by being inserted into the opening from above. it can.

  In addition, the heat recovery device 30 including the fan 37 (air supply means) for feeding in is a hot air generator that recovers heat from the combustion gas in the passage portion, warms the air with the recovered heat, and feeds the air. . The gas from which heat is recovered in the heat recovery device 30 and the hot air generator is not limited to the combustion gas obtained by burning the fuel, but may be a gas heated by an electric heater.

  When heavy oil is burned by the burner 18, the generated combustion gas contains impurities such as soot and sulfur, which are carbon fine particles. When the combustion gas containing the impurities is continuously supplied from the burner 18 to the tubes (the first tube 19A and the second tube 19B), the impurities accumulate on the outer peripheral surface of the lower portion 32a of the tubular member 32 and the like. The accumulated impurities hinder the flow of the combustion gas and cause a reduction in the efficiency of heat transfer to the tubular member 32, and thus need to be removed periodically.

  Therefore, as shown in FIG. 6A, a plate-shaped member 41 formed of metal or the like is attached to a lower portion 32a (heat receiving portion) of the plurality of tubular members 32 so as to be able to move up and down (arrow j). 8A and 8B, a through-hole 41 a is formed in the plate-shaped member 41 at a position corresponding to the arrangement of the plurality of tubular members 32. The inner diameter of the through hole 41 a is set slightly larger than the outer diameter of the tubular member 32, so that the plate-shaped member 41 can move up and down with respect to the lower portion 32 a of the tubular member 32. The plate-shaped member 41 is connected to an elevating body (not shown) screwed to a ball screw (not shown) extending in the elevating direction (here, the vertical direction) of the plate-shaped member 41. The plate member 41 is moved up and down by the rotation of a ball screw driven by a drive motor (not shown).

  By moving the plate member 41 up and down, impurities accumulated on the lower portion 32a of the tubular member 32 by sliding on the outer periphery of the tubular member 32 are removed by the inner peripheral surface of the through hole 41a. That is, the plate member 41 becomes a sliding member that slides on the outer periphery of the tubular member 32. 8C, a fibrous brush 42 is implanted on the inner peripheral surface of the through hole 41a, and the brush 42 is slid on the outer peripheral surface of the lower portion 32a of the tubular member 32. The impurities may be removed. Thereby, impurities can be more reliably removed. That is, the brush 42 is a sliding member that slides on the outer periphery of the tubular member 32. Further, one side plate constituting the lower portion 31a of the housing 31 is slidably connected to the plate member 41, and the worker slides the side plate during the maintenance work to move the plate member 41 up and down. By doing so, impurities may be removed. In this case, an elevating mechanism such as a ball screw and a drive motor becomes unnecessary. As described above, the plate-shaped member 41 serves as an impurity removing unit that removes impurities attached to the lower portion 32 a (heat receiving portion) of the tubular member 32, and the impurity removing unit slides on the outer periphery of the tubular member 32. It has a sliding member. Thereby, impurities accumulated in the lower portion 32a of the tubular member 32 can be easily removed. Note that the impurity removing means is not limited to the above-described configuration. That is, any material may be used as long as it removes impurities adhered to the heat receiving portion, and for example, may be one that blows high-pressure air to remove impurities.

  As described above, the laver manufacturing apparatus 1 of the present embodiment includes the heating device 17 that generates heated air and supplies the heated air to the drying chamber 3. The heating device 17 includes a combustion gas generation means (burner 18) for generating combustion gas, and a pipe (first pipe 19A) for guiding the generated combustion gas to an outlet (chimney 22) for discharging the combustion gas to the outside of the drying chamber 3. And a second pipe 19B), a heat recovery device 30 that recovers heat from the combustion gas supplied to the pipe, and heats the air taken in from the outside of the drying chamber 3 by the recovered heat, and a pipe that heats the air. And a heated air supply means (intake fan 21 as a second fan) for supplying heated air generated by blowing to the drying chamber 3.

  The heat recovery device 30 of the present embodiment includes a heat receiving portion (a lower portion 32a of the tubular member 32) in which the combustion gas supplied to the pipe is provided on a path toward the chimney 22 and receives heat from the combustion gas. A heat radiating portion (upper portion 32b of the tubular member 32) for releasing the heat received by the heat receiving portion to air taken in from outside the drying chamber 3; This makes it possible to recover and reuse heat from the used combustion gas with a simple structure.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIG. The components described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The second embodiment and the first embodiment are different from each other in the structure of the pipe constituting the combustion gas passage (flow path).

  The second pipe 190B guides the combustion gas that has passed through the first pipe 19A and the connecting portion 20 to the third pipe 190C. That is, one end of the second tube 190B is connected to the connecting portion 20, and the other end is connected to one end of the third tube 190C. The dashed line R1 shown in FIG. 9 illustrates the boundary between the second tube 190B and the third tube 190C. The third pipe 190C is disposed between the intake fan 21 and the duct 24, and the other end is connected to one end of a combustion gas introduction pipe 34A provided in the heat recovery device 30. . A dashed line R2 shown in FIG. 9 illustrates a boundary between the third pipe 190C and the chimney 220. A plurality of fins 200 are provided at a predetermined pitch in the horizontal direction on the surface of the third tube 190C.

  The other end of the combustion gas introduction pipe 34A communicates with one end of the combustion gas discharge pipe 34B via the lower portion 31a of the housing 31. The other end of the combustion gas discharge pipe 34 </ b> B is connected to a chimney 220 having a discharge port 220 a located outside the cabin 4. A dashed line R3 shown in FIG. 9 illustrates a boundary between the pipe 34B for discharging the combustion gas and the chimney 220.

  The air sent to the duct 24 (arrow k) is heated to a predetermined temperature by the heat recovery device 30 as in the first embodiment, and the warmed air flows from the opening 24 b of the duct 24 to the intake fan 21. (Arrow l). The warm air flowing toward the intake fan 21 is further heated to a predetermined temperature via the third pipe 190 </ b> C and the fins 200 heated by the combustion gas, and then sucked into the intake fan 21. As described above, according to the second embodiment, the air in the cabin 4 can be heated by more effectively using the heat of the combustion gas. Further, by providing the plurality of fins 200 in the third tube 190C, the heat transfer area can be increased and the efficiency of heat exchange can be further improved.

  The laver production machine 1 and the heat recovery device 30 of the present invention are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the invention. In particular, the application of the heat recovery device 30 is not limited to the laver manufacturing machine 1 and may be any application that generates heat by collecting heat from a high-temperature gas such as combustion gas. For example, it is also possible to generate heat separately from the combustion gas obtained by heating a greenhouse that grows vegetables and flowers and cultivate fish, to generate hot air separately, and use it for heating a house attached to the greenhouse.

INDUSTRIAL APPLICABILITY The laver production machine of the present invention can recover heat from used combustion gas with a simple structure and reuse it, and is useful in the laver production field and the so-called environmental technology field for reusing thermal energy.

1 Nori making machine 3 Drying room (drying section)
5 Endless chain (transportation means)
Reference Signs List 6 Sheeting part 7 Dehydration part 8 Stripping part 10 Cage 11 Cage holder 12 Endless chain 17 Heating device (air heating unit)
18 Burner (combustion gas generation means)
19A First tube (tube)
19B, 190B Second tube (tube)
21 Intake fan (heating air supply means)
22a, 220a Discharge port 30 Heat recovery device 32 Tubular member 32a Lower part of tubular member (heat receiving part)
32b Upper part of the tubular member (radiator)
37 Sending fan (air supply means)
38 Heat radiation fins (fins)
39 Rectifier plate (rectifier means)
41 Plate member (impurity removing means, sliding member)
42 brush (sliding member)
w Raw nori

Claims (7)

A paper making unit for making raw laver on the cage of the cage holder holding a plurality of cages, a dewatering unit for dewatering the raw laver made by the paper making unit, and dewatered by the dewatering unit A laver production machine comprising a drying unit for drying raw nori, an air heating unit for generating heated air and supplying the dried air to the drying unit, and a peeling unit for peeling the dried dry laver from the pond. So,
The air heating unit,
Combustion gas generation means for generating combustion gas,
A pipe that guides a combustion gas generated by the combustion gas generation unit to an outlet that discharges the combustion gas out of the drying unit;
A heat recovery device that recovers heat from the combustion gas supplied to the tube and warms air taken in from outside the drying unit by the recovered heat,
Blowing air heated by the heat recovery device to the tube, heating air supply means for supplying the heating air generated thereby to the drying unit,
The heat recovery device,
Including a plurality of independent tubular members containing a heat medium in the internal space,
A lower portion of the tubular member is provided on a passage toward which the combustion gas supplied to the pipe is directed to the discharge port, and constitutes a heat receiving unit that receives heat from the combustion gas,
The seaweed making machine characterized in that the upper part of the tubular member constitutes a heat radiating part for releasing the heat received by the heat receiving part to air taken in from outside the drying part. Above the heated air supply means, a duct into which air heated by the heat radiating unit is supplied is provided,
An opening is formed on the lower surface of the duct facing the heated air supply means,
The heat recovery device further includes a housing in which a plurality of the tubular members are provided,
The said housing | casing is provided with the partition plate for partitioning the flow path of the air sent into the said duct, and the flow path of the said combustion gas sent to the said pipe | tube, The characterized by the above-mentioned. Nori making machine. Seaweed maker according to claim 1 or 2, further comprising an air feeding means for feeding air to the heat radiating portion. The laminator according to claim 3 , further comprising a rectifying unit that regulates a flow of air supplied to the heat radiating unit by the air supplying unit. The combustion gas contains impurities,
The laver manufacturing apparatus according to any one of claims 1 to 4 , further comprising an impurity removing unit configured to remove impurities attached to the heat receiving unit. The movable said heat medium between said heat receiving portion and the heat radiating portion, seaweed preparation described heat received by the heat receiving unit to any one of claims 1 to 5, characterized in that transmitted to the heat radiating portion Machine. Said impurity removing means, seaweed maker according to claim 5 or 6, wherein a sliding member which slides the outer periphery of the tubular member.

Images