WO2024089790A1 - 多管式貫流ボイラー及びその稼働方法 - Google Patents

多管式貫流ボイラー及びその稼働方法 Download PDF

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Publication number
WO2024089790A1
WO2024089790A1 PCT/JP2022/039898 JP2022039898W WO2024089790A1 WO 2024089790 A1 WO2024089790 A1 WO 2024089790A1 JP 2022039898 W JP2022039898 W JP 2022039898W WO 2024089790 A1 WO2024089790 A1 WO 2024089790A1
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WIPO (PCT)
Prior art keywords
water tube
boiler
combustion chamber
steam
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/039898
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English (en)
French (fr)
Japanese (ja)
Inventor
忠行 猪野
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Nihon Kikan Co ltd
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Nihon Kikan Co ltd
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Filing date
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Priority to JP2024552573A priority Critical patent/JPWO2024089790A1/ja
Priority to CN202280101408.0A priority patent/CN120187985A/zh
Priority to PCT/JP2022/039898 priority patent/WO2024089790A1/ja
Publication of WO2024089790A1 publication Critical patent/WO2024089790A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/56—Boiler cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down

Definitions

  • the present invention relates to a multi-tube once-through boiler that generates steam by heating a large number of water tubes, and in particular to a structure and operating method for reducing the amount of residual ash that adheres to the inside of the combustion chamber in a multi-tube once-through boiler that can use recycled oil as fuel.
  • a multi-tube once-through boiler has multiple water tubes arranged vertically in a cylindrical combustion tube with an upper and lower bottom, and two rows of water tubes, an inner water tube row 3 and an outer water tube row 4, are connected between an annular upper header 1 and a lower header 2.
  • the space between adjacent inner water tube rows 3 and adjacent outer water tube rows 4 is blocked (closing fins 8), and part of the space between the water tubes in the inner water tube row 3 is opened (inner smoke vent 5), forming a combustion gas passage 7 between the inner water tube row 3 and the outer water tube row 4, and boiler water is supplied to each water tube from the lower header 2.
  • fuel is supplied to the burner 10 installed in the combustion tube and burned to generate combustion gas in the combustion chamber 9, and the combustion gas is supplied from the combustion gas passage 7 to the outside of the multiple water tubes to heat and evaporate the boiler water in the water tubes, and consumed steam is taken out from the upper header 1.
  • the combustion exhaust gas passes through the combustion gas passage 7 and the outer smoke vent 6 and is discharged from the flue 12 as combustion exhaust gas with a reduced temperature.
  • the peripheral portions of the upper header 1 and the lower header 2 are covered with a refractory material 13, and the entire combustion tube is covered with a heat insulating material 14.
  • Patent Document 2 which is designed to use recycled oil (waste oil) as fuel for the combustion gas used to generate consumed steam.
  • the combustion chamber is cylindrical and extends horizontally, and a door (lid) is formed on one end facing the combustion chamber, allowing the interior to be seen by opening and closing the door (lid).
  • a door (lid) is formed on one end facing the combustion chamber, allowing the interior to be seen by opening and closing the door (lid).
  • the inside of the combustion chamber can be cleaned by opening and closing the door (lid), but the amount of residual ash generated by using recycled oil (waste oil) was greater than expected, and the frequency of cleaning increased accordingly, making the cleaning work more cumbersome.
  • cleaning by opening and closing the door (lid) was performed after the multi-tube once-through boiler was shut down, which created the problem that it took a long time to completely remove the residual ash that had stubbornly adhered to the inside of the combustion chamber and around the water tubes.
  • the present invention was made in consideration of the above-mentioned circumstances, and aims to provide a multi-tube once-through boiler structure that can suppress adhesion of residual ash to the surface of the water tubes in the combustion chamber when using recycled oil (waste oil) as combustion gas to generate consumed steam.
  • the present invention provides a multi-tube once-through boiler (100) comprising a combustion chamber (9) to which combustion gas is supplied from a burner (10) installed at one end thereof, a water tube row consisting of a plurality of water tubes installed in the combustion chamber (9), and boiler water supplied into the water tubes by the combustion gas is heated and evaporated to extract consumed steam,
  • a multi-tube once-through boiler 100
  • the present invention is characterized in that steam is intermittently injected during operation of the multi-tube once-through boiler to suppress adhesion of residual ash caused by combustion of the recycled oil to the surface side of the water tube row when the recycled oil is used.
  • the device is characterized by having an injection control device (85) that controls the injection time of steam injected from the nozzle, and injecting steam intermittently while the multi-tube once-through boiler is in operation.
  • the steam sprayed from the nozzle is characterized by using the consumed steam obtained from the multi-tube once-through boiler (100) by feeding it back.
  • the steam is supplied by branching off the consumed steam extracted from a multi-tube once-through boiler.
  • the first nozzle row which is composed of a plurality of nozzles (50), is characterized by being disposed at a position facing the water tube row from a partition wall (30) installed in the combustion chamber (9) so that the combustion gas from the burner (10) collides and flows back.
  • the water tube row is composed of an inner water tube row (3) and an outer water tube row (4),
  • a second nozzle row consisting of a plurality of nozzles (60) is disposed at a position facing the gap between the inner water tube row (3) and the outer water tube row (4) from the inner surface side of a closing plate (40a) installed in the combustion chamber (9) on the burner (10) side.
  • the system is characterized by the fact that a third nozzle row consisting of a plurality of nozzles (70) is disposed at a position facing the gap between the inner water tube row (3) and the outer water tube row (4) from the inner surface side of the closing plate (40b) installed at the rear of the partition wall (30) on the opposite side from the burner (10).
  • the steam injection angle from each nozzle (50) of the first nozzle row is characterized by being 100 degrees to 115 degrees. Also, the nozzles (60, 70) of the second nozzle row and the third nozzle row each have a steam injection angle of 10 degrees to 20 degrees.
  • the system is characterized by having a flue (12) that communicates with the combustion chamber (9) and a cyclone device (90) connected to the flue (12).
  • the system is characterized by the fact that a bag filter (92) is connected to the combustion gas outlet of the cyclone device (90) in the flue (12) via a cooling device (91).
  • one bag filter (92) is connected to the cyclone device (90) and the cooling device (91).
  • a combustion chamber is formed inside each water tube, and combustion gas from the combustion chamber is supplied to the surface side of the plurality of water tubes to heat and evaporate the boiler water in the water tubes and extract consumed steam, Using recycled oil as fuel, A door (lid 22) is formed on one end side facing the combustion chamber (9), and a burner (10) for supplying combustion gas to the combustion chamber (9) is installed on the outer surface of the door (lid 22);
  • the combustion chamber (9) is cylindrical and extends horizontally.
  • the water tubes are arranged on the left and right sides of the combustion chamber (9) and have an arc shape.
  • the water tube row arranged on the left side of the combustion chamber (9) is connected to a left upper header (1L) provided at an upper end and a left lower header (2L) provided at a lower end, each of which is linear;
  • the water tube row arranged on the right side of the combustion chamber (9) is connected to a straight right upper header (1R) provided at an upper end and a straight right lower header (1R) provided at a lower end,
  • the water tube row is composed of an inner water tube row (3) and an outer water tube row (4), each water tube of the outer water tube row (4) is disposed between each water tube of the inner water tube row (3), and each water tube constituting the left and right inner water tube rows (3) is connected by a closing fin (8);
  • the water tubes constituting the left and right outer water tube rows (4) are connected with closing fins (8), and a partition wall (30) is installed near the end of the inner water tube row (3) to which the combustion gas is injected to partition the combustion chamber (9).
  • An inner smoke vent (5) is formed between an end water tube of the inner water tube row (3) on the door (lid body 22) side of the combustion chamber (9) and the combustion chamber wall on the door (lid body 22) side, and cutouts (5A) are formed only in closing fins (8) that are 10 to 20% of the total number of water tubes from the door (lid body 22) side connecting the water tubes of the inner water tube row (3),
  • the combustion chamber (9) side of the partition wall (30) is provided with a plurality of nozzles (50) for injecting steam, positioned along and close to the inner water tube row (3).
  • a flue (12) communicating with the combustion chamber (9) is arranged on the upper surface of the combustion chamber (9) opposite the door side, and upper cutouts (41) are formed in the multiple closing fins (8) of the outer water tube row (4) at a position facing the opening of the flue (12).
  • nozzles (60) for injecting steam into the gap between the inner water tube row (3) and the outer water tube row (4) are arranged at a position facing the gap on the door side of the combustion chamber (9).
  • the system is characterized by the fact that a number of nozzles (70) for injecting steam into the gap between the inner water tube row (3) and the outer water tube row (4) are disposed on the inner surface of the closing plate (40b) installed on the opposite side of the door side of the combustion chamber (9).
  • the method for operating a multi-tube once-through boiler includes connecting both ends of each of a plurality of water tubes, supplying boiler water to each water tube, forming a combustion chamber inside each water tube, and supplying combustion gas from a burner installed at one end of the combustion chamber to the surface side of a water tube row composed of a plurality of water tubes to heat and evaporate the boiler water in the water tubes and extracting consumed steam, the method comprising the steps of:
  • This system is characterized by using recycled oil as fuel and intermittently injecting steam from multiple nozzles arranged on the surface side of the water tube row during operation of the multi-tube once-through boiler, thereby suppressing the adhesion of residual ash caused by combustion of the recycled oil to the surface side of the water tube row when using the recycled oil.
  • the operating method of a multi-tube once-through boiler is characterized by intermittent steam injection for 5 to 15 seconds every 1 to 2 hours.
  • a multi-tube once-through boiler that uses recycled oil as a combustion fuel
  • steam is intermittently injected from multiple nozzles (50, 60, 70) while the multi-tube once-through boiler is in operation, so that adhesion of residual ash caused by combustion of the recycled oil to the surface side of the water tube rows (3, 4) can be suppressed.
  • the first nozzle row (nozzles 50) By arranging the first nozzle row (nozzles 50) at a position facing the water tube row from the partition wall (30), it is possible to suppress the generation of residual ash that adheres to the water tube row (inner water tube row 3) when the combustion gas from the burner (10) collides and flows back.
  • the injected steam can be made to easily impinge on the periphery of the water tube rows (3, 4), and the generation of residual ash adhering to this portion can be effectively suppressed.
  • the steam injection angle of the nozzles (60, 70) to 10 degrees to 20 degrees, the injected steam is injected in a straight line, making it easier for it to enter the gap between the inner water tube row (3) and the outer water tube row (4), and the generation of residual ash adhering to this portion can be effectively suppressed.
  • the combustion gas in the combustion chamber (9) can flow out of the upper cutouts (41) to the outside of the outer water tube row (4) and be guided to the flue (12).
  • FIG. 1 is a side view illustrating a multi-tube once-through boiler according to one embodiment of the present invention.
  • FIG. 1 is a front view illustrating a multi-tubular once-through boiler according to one embodiment of the present invention.
  • FIG. 4 is a front view illustrating an inner water tube row and an outer water tube row.
  • FIG. 4 is a partial cross-sectional explanatory view showing the connection structure between the upper header and the inner and outer water pipes.
  • FIG. 4 is an explanatory side view showing an inner water tube row and an outer water tube.
  • FIG. 2 is a plan view perspective explanatory diagram for explaining the structure inside the main body of a multi-tube once-through boiler.
  • FIG. 1 is a side view illustrating a multi-tube once-through boiler according to one embodiment of the present invention.
  • FIG. 1 is a front view illustrating a multi-tubular once-through boiler according to one embodiment of the present invention.
  • FIG. 4 is a front view illustrating an inner water tube row and an
  • FIG. 2 is a side perspective view illustrating the internal structure of the main body of a multi-tubular once-through boiler.
  • FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 6 for explaining the nozzle installation location.
  • FIG. 13 is a perspective explanatory diagram showing the main body from the lid side to explain the location of the nozzle.
  • FIG. 13 is a perspective explanatory diagram showing the main body as viewed from the combustion chamber side to explain the location of the nozzle.
  • FIG. 1 is a system configuration diagram for explaining the flow of combustion exhaust gas when multiple multi-tube once-through boilers are used.
  • FIG. 1 is a schematic diagram illustrating a conventional multi-tube once-through boiler. 13 is an explanatory cross-sectional view taken along the line AA in FIG. 12.
  • Figures 1 and 2 show the external appearance of a multi-tube once-through boiler 100, with a hinge section 21 attached to a cylindrical body 20 with a bottom, both ends of which are closed by closure plates 40a and 40b, and a lid 22 that serves as a door for opening and closing the front side of the body 20, rotatably attached to the hinge section 21.
  • a burner 10 is installed on the outer surface of the lid 22, and by supplying fuel to the burner 10 and burning it (at about 1500°C), combustion gas is generated in the combustion chamber 9 between the closure plates 40a and 40b on the lid 22 side inside the body 20.
  • the surrounding area of the burner 10 on the combustion chamber 9 side is covered with a fireproof material 13.
  • the combustion gas generated in the combustion chamber 9 of the main body 20 heats a number of water tubes installed inside the main body 20 from the surface side, and is discharged as combustion exhaust gas from the flue 12 provided above the main body 20. Water is supplied to the multiple water tubes, and the area around each water tube is heated by the combustion gas generated in the combustion chamber 9 to generate steam.
  • the steam is discharged to the outside as consumed steam from a piping line 81 via a steam separator 80 for removing large water droplets in the steam.
  • the steam separator 80 is equipped with a pressure gauge 82 for measuring the steam pressure and a safety valve 83 for releasing the steam when the pressure rises.
  • the multi-tube once-through boiler 100 of the present invention uses only recycled oil as the fuel for the combustion gas used to generate consumed steam.
  • injecting steam into the combustion chamber during operation is effective in preventing the adhesion of residual ash inside the combustion chamber, and we propose a structure for this purpose.
  • Recycled oils include various types of used mineral waste oils such as engine oil, waste cooking oils such as used tempura oil, waste animal and vegetable oils obtained mainly from animal fats and oils, and grease trap oil obtained by separating and storing oil in wastewater containing fats and oils discharged from kitchens of restaurants and other establishments using grease traps.
  • used mineral waste oils such as engine oil
  • waste cooking oils such as used tempura oil
  • waste animal and vegetable oils obtained mainly from animal fats and oils
  • grease trap oil obtained by separating and storing oil in wastewater containing fats and oils discharged from kitchens of restaurants and other establishments using grease traps.
  • a cylindrical combustion chamber 9 with a bottom is formed extending horizontally in the center of the main body 20 , and a plurality of arc-shaped water pipes are arranged so as to surround the inside of the combustion chamber 9 .
  • the group of water tubes arranged on the left inside of the combustion chamber 9 is referred to as the inner water tube row 3L, with each upper end connected by a straight left upper header 1L and each lower end connected by a straight left lower header 2L.
  • the group of water tubes arranged on the right inside of the combustion chamber 9 is referred to as the inner water tube row 3R, with each upper end connected by a straight right upper header 1R and each lower end connected by a straight right lower header 2R.
  • closing fins 8 connect each water tube constituting the left and right inner water tube rows 3L, 3R.
  • water tubes are arranged between each water tube of the inner water tube row 3, and these water tube groups form the outer water tube row 4.
  • the outer water tube rows 4 are arranged outside the left and right inner water tube rows 3, and like the left and right inner water tube rows 3, the upper ends of the left water tube group are connected to the left upper header 1L and the lower ends are connected to the left lower header 2L, and the upper ends of the right water tube group are connected to the right upper header 1R and the lower ends are connected to the right lower header 2R.
  • the water tubes that make up the left and right outer water tube rows 4 are connected by closing fins 8.
  • a combustion chamber 9 is partitioned by installing a partition wall 30 made of fireproof material 13 near the end of the inner water tube row 3 where the combustion gas is injected inside the main body 20, and the combustion gas injected from the burner 10 is configured so that it all flows back after colliding with the partition wall 30.
  • a fireproof material 13 is arranged that is thick enough to prevent deformation even when high-temperature combustion gas collides with it.
  • a heat insulating material 14 is also arranged on the inside of the closing plate 40b to prevent deformation.
  • an inner smoke vent 5 is formed between the inner wall of the lid 22 and the end water tube, and a notch (inner smoke vent 5A) is formed in the closing fin 8 that connects the water tubes of the inner water tube row 3. That is, as shown in FIG. 6, a notch (shaded area in FIG. 5) is formed in each of the three closing fins 8 from the lid 22 side.
  • the notch is formed with three stages of opening, with the notch area being the widest on the lid 22 side. This is because the notch near the combustion gas outlet of the burner 10 is made larger (see FIG. 5), making it easier for the combustion gas that collides with the partition wall 30 and flows back to return to the vicinity of the lid 22 side.
  • cutouts are formed in only three closing fins 8 out of 19 water tubes, but the number of closing fins 8 that form cutouts is preferably about 10-20% of the total number of water tubes, in other words, 2-3 cutouts are preferably formed for 19 water tubes in this example, so as not to create resistance to the flow of combustion gas and to ensure that the combustion gas flows back.
  • a plurality of nozzles 50 for injecting steam are arranged in a ring shape along the inside of the inner water tube row 3 (first nozzle group).
  • a circular pipe 51 arranged along the inside of the inner water tube row 3 in the combustion chamber 9 is provided with a plurality of nozzles 50 whose injection ports face the combustion chamber 9 .
  • a plurality of nozzles 60 for injecting steam into this gap are arranged in a ring shape along the gap between the water tube rows (second nozzle group).
  • a pair of semicircular pipes 61 are installed in a combustion chamber 9, and steam is supplied to each semicircular pipe 61 from the outside via a pipe 62, so that steam is supplied along the semicircular pipes 61 and is sprayed from a plurality of nozzles 60 provided on the semicircular pipes 61.
  • a plurality of nozzles 70 for injecting steam into this gap are arranged in a ring shape along the gap between the water tube rows (third nozzle group). Specifically, as shown in FIGS. 6 and 8, a plurality of nozzles 70 are provided in a circular pipe 71 disposed between the inner water tube row 3 and the outer water tube row 4 in the combustion chamber 9 .
  • the consumed steam discharged from the multi-tube once-through boiler 100 is branched 84 and supplied to these multiple nozzles 50, 60, 70 through the circular pipe 51, semicircular pipe 61, and circular pipe 71 from the pipes 52, 62, and 72 via an injection control device 85, respectively.
  • the branch 84 allows a portion of the consumed steam discharged from the multi-tube once-through boiler 100 to be fed back and used as injection steam from each of the nozzles 50, 60, and 70.
  • the injection control device 85 controls the injection time and injection pressure of the steam, so that steam is intermittently injected from the tips of nozzles 50, 60, and 70 at a pressure of 0.4 to 0.8 MPa for 5 to 15 seconds at intervals of 1 to 2 hours.
  • the temperature inside the combustion chamber 9 reaches 900 to 1000°C, so that injecting steam at approximately 150 to 175°C from each nozzle will lower the temperature of the water tubes.
  • the steam intermittently, the drop in the water tube surface temperature can be suppressed.
  • the steam supplied to each nozzle is the consumed steam discharged from the multi-tubular once-through boiler 100, which is branched 84 and adjusted by the injection control device 85.
  • steam supplied from another line may be used instead of the consumed steam from the multi-tubular once-through boiler 100.
  • the supply time and pressure of the steam supplied from another line may be controlled by, for example, a flow regulator or a pressure regulator, and it may be intermittently injected into the combustion chamber 9.
  • spraying steam from each nozzle is that spraying steam with mass will blow away any remaining ash and prevent it from adhering to the surrounding water tubes that make up the water tube rows 3 and 4, and by using high-temperature steam, damage to the water tubes in the combustion chamber 9, which is filled with combustion gas and is at high temperatures (900-1000°C), will be prevented even if the steam comes into contact with the water tubes.
  • the nozzle holes in each nozzle 50 in the first nozzle row are selected to have a spray angle of 100 degrees to 115 degrees.
  • the spray range is widened to ensure that the spray is directed to the inner wall surface of the inner water tube 3, preventing the adhesion of residual ash.
  • each nozzle 60, 70 of the second nozzle row and the third nozzle row are selected so that the injection angle is between 10 degrees and 20 degrees.
  • the steam is injected in a straight line, which makes it easier for the steam to enter the gap between the inner water tube row 3 and the outer water tube row 4.
  • the pressure of the injected steam is preferably about 0.4 to 0.8 MPa to prevent residual ash from adhering to the area around the water tube.
  • the first nozzle group can suppress the generation of residual ash adhering to the surface of the inner water tube row 3 in the combustion chamber, while the second and third nozzle groups can suppress the generation of residual ash adhering to the gap between the inner water tube row 3 and the outer water tube row 4.
  • the flow of combustion gas that flows back inside the combustion chamber 9 flows from the door (lid body 21) side to the closure plate 40b side in the gap between the inner water tube row 3 and the outer water tube row 4, the flow of combustion gas can be made smooth by injecting steam at the part where the flow is stagnant in the cutout portion 5A.
  • a flue 12 for carrying out combustion exhaust gas, which communicates with the combustion chamber 9, is disposed on the upper surface of the combustion chamber 9 opposite the door side.
  • An upper cutout 41 corresponding to the upper semicircle is formed in a plurality of closing fins 8 (three water tubes in the illustrated example) of the outer water tube row 4 at a position facing the opening 12a of the flue 12. The presence of multiple upper cutouts 41 allows combustion exhaust gas to flow out from the gap between the inner water tube row 3 and the outer water tube row 4 on the closure plate 40b side through the upper cutouts 41 to the outside of the outer water tube row 4.
  • the three upper cutouts 41 are also formed so that the opening area increases the closer they are to the partition wall 30. This is to allow the flow of combustion gas to reach as far back as possible, increasing the contact area with the water tube row and improving the efficiency of heat exchange with the combustion gas.
  • a cyclone device 90 is connected above the flue 12 to separate powder (residual ash) from the combustion exhaust gas.
  • the cyclone device 90 is a powder separator that uses centrifugal separation to separate powdered residual ash mixed with the gas, and a device with a general structure for separating gas and powder is used.
  • a water supply port 23 is provided on the underside of the left lower header 2L and the right lower header 2R, and a steam exhaust port 24 is provided on the top surface of the left upper header 1L and the right upper header 1R.
  • boiler water is supplied to each of the multiple water tubes arranged in an arc shape, and when combustion gas is supplied from the burner 10 to the combustion chamber 9, the combustion gas from the combustion chamber 9 comes into contact with the inner surface (the surface facing the combustion chamber 9) of each water tube of the inner water tube row 3, heating the boiler water in the water tubes.
  • the combustion gas bounces off the partition wall 30 installed at the end of the combustion chamber 9 and is returned to the lid body 22 side, but as shown in Figure 6, it is led from the inner smoke vent 5 and the cutout (inner smoke vent 5A) to the combustion gas passage 7 between the inner water tube row 3 and the outer water tube row 4, where it comes into contact with the inner surface of the inner water tube row 3 and the inner surface of the outer water tube row 4, heating the boiler water in the water tubes.
  • the boiler water in the water tubes of the inner water tube row 3 and the outer water tube row 4 is heated to become steam, and the steam is extracted from the steam exhaust port 24 provided in the left upper header 1L and the right upper header 1R via the steam separator 80, the piping line 81 and the branch 84, and is consumed at the desired supply location.
  • the combustion gas is cooled by heating the boiler water in the water tubes, and is separated into combustion exhaust gas and powder through the flue 12 and the cyclone device 90 and discharged to the outside.
  • the cyclone device 90 is connected to a bag filter 92 via a cooling device 91 for cooling the combustion exhaust gas.
  • the cooling device 91 is provided to cool the combustion exhaust gas to a certain temperature or lower, because if the combustion exhaust gas is too hot when dust (powder) adheres to the surface of the filter cloth of the bag filter 92, the filter cloth will be damaged and the adhesion effect will not be obtained. With this configuration, it is possible to discharge the combustion exhaust gas from the bag filter 92 with almost all solid content removed.
  • a cyclone device 90 and a cooling device 91 can be connected to each multi-tubular once-through boiler 100, and the exhaust paths from each cooling device 91 can be combined and introduced into a bag filter 92, as shown in FIG. 11.
  • the multi-tubular once-through boiler 100 when recycled oil (waste oil) is used as the combustion fuel for the burner 10, steam is intermittently injected from the multiple nozzles 50, 60, 70 arranged in the first nozzle row, the second nozzle row, and the third nozzle row while the multi-tubular once-through boiler 100 is in operation, generating an airflow around the water tube rows, and suppressing the generation of residual ash adhering around the inner water tube row 3 and the outer water tube row 4 in the combustion chamber 9.
  • recycled oil waste oil
  • Nozzle (third nozzle group) 71 Circular piping 80: Steam separator 82: Pressure gauge 83: Safety valve 84: Branch 85: Injection control device 90: Cyclone device 91: Cooling device 92: Bag filter 100: Multi-tube once-through boiler

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PCT/JP2022/039898 2022-10-26 2022-10-26 多管式貫流ボイラー及びその稼働方法 Ceased WO2024089790A1 (ja)

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JP2024552573A JPWO2024089790A1 (https=) 2022-10-26 2022-10-26
CN202280101408.0A CN120187985A (zh) 2022-10-26 2022-10-26 多管式贯流锅炉及其运转方法
PCT/JP2022/039898 WO2024089790A1 (ja) 2022-10-26 2022-10-26 多管式貫流ボイラー及びその稼働方法

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