WO2013114721A1 - 排ガス処理装置 - Google Patents

排ガス処理装置 Download PDF

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Publication number
WO2013114721A1
WO2013114721A1 PCT/JP2012/081343 JP2012081343W WO2013114721A1 WO 2013114721 A1 WO2013114721 A1 WO 2013114721A1 JP 2012081343 W JP2012081343 W JP 2012081343W WO 2013114721 A1 WO2013114721 A1 WO 2013114721A1
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WIPO (PCT)
Prior art keywords
exhaust gas
passage
popcorn ash
flow direction
disposed
Prior art date
Application number
PCT/JP2012/081343
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English (en)
French (fr)
Japanese (ja)
Inventor
章泰 岡元
心平 戸▲高▼
学 小田
坂田　展康
博美 河越
Original Assignee
三菱重工業株式会社
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Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to CN201280062461.0A priority Critical patent/CN103998865B/zh
Publication of WO2013114721A1 publication Critical patent/WO2013114721A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00—Intercepting solids
    • F23J2217/20—Intercepting solids by baffles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Definitions

  • the present invention relates to an exhaust gas processing device applied to a boiler for generating steam for power generation or factory use.
  • a conventional pulverized coal burning boiler has a hollow furnace and has a vertically installed furnace, and a plurality of combustion burners are disposed along the circumferential direction on the furnace wall, and a plurality of stages in the vertical direction are provided. Are placed across.
  • the combustion burner is supplied with a mixture of pulverized coal (fuel) and primary air from which coal has been crushed, and is supplied with high temperature secondary air, and this mixture and secondary air are blown into the furnace. Form a flame, which can be burned in this furnace.
  • a flue is connected to the upper part of the furnace, and a superheater, a reheater, a economizer, etc.
  • an exhaust gas passage is connected, a denitration device, an electrostatic precipitator, a desulfurization device and the like are provided in the exhaust gas passage, and a chimney is provided at a downstream end.
  • Patent No. 2724176 gazette U.S. Patent No. 6,994,036
  • the exhaust gas generated in the boiler furnace is mixed with popcorn ash, which is a lump of ash of several millimeters to several tens of millimeters.
  • the wire mesh provided in the exhaust gas passage is a mesh of several millimeters or less. Therefore, when a large amount of popcorn ash collides with a wire mesh or the like, there is a problem that the mesh of the wire mesh is locally clogged, wear occurs, or the wire mesh is broken.
  • Patent Document 2 although the popcorn ash collision force is absorbed by inclining the collection member, the exhaust gas flowing through the exhaust gas passage is faster in the central portion than the wall surface portion. The wear and breakage of the central portion of the collecting member become severe.
  • the present invention solves the above-mentioned problem, and an object of the present invention is to provide an exhaust gas processing system capable of properly collecting popcorn ash.
  • an exhaust gas processing apparatus includes an exhaust gas passage capable of flowing a combustion gas, a heat recovery unit provided in the exhaust gas passage and capable of recovering heat in the exhaust gas, and A harmful substance removing unit provided downstream of the heat recovery unit in the flow direction of the exhaust gas and capable of removing harmful substances in the exhaust gas, and provided between the heat recovery unit and the harmful substance removing unit in the exhaust gas passage
  • a popcorn ash collecting portion capable of collecting popcorn ash in exhaust gas, the popcorn ash collecting portion having a plurality of inclined portions inclined at a predetermined inclination angle with respect to the flow direction of the exhaust gas
  • the inclination angle of the inclined portion disposed at the central portion of the exhaust gas passage is set smaller than the inclination angle of the inclined portion disposed at the outer peripheral portion of the exhaust gas passage. It is an.
  • the exhaust gas flowing through the exhaust gas passage is subjected to heat recovery by the heat recovery unit, then popcorn ash is collected by the popcorn ash collection unit, and then harmful substances are removed by the harmful substance removal unit.
  • the popcorn ash collecting portion has a plurality of inclined portions, the collecting area of the popcorn ash is increased, and the popcorn ash can be collected efficiently.
  • the inclination angle of the inclined portion disposed in the central portion of the exhaust gas passage is set smaller than the inclination angle of the inclined portion disposed in the outer peripheral portion of the exhaust gas passage, the flow velocity is relatively fast flowing through the central portion of the exhaust gas passage. Since the flow of popcorn ash is deflected to reach the inclined portion, the flow velocity and pressure loss are reduced, damage to the popcorn ash collection portion due to popcorn ash is suppressed, and popcorn ash is properly collected. be able to.
  • the plurality of inclined portions have a plurality of inclined collection surfaces that intersect the flow direction of the exhaust gas and extend in the vertical direction, and the inclination direction is reverse to the flow direction of the exhaust gas.
  • the inclined collection surfaces are alternately connected to each other, and the inclination angle of the inclined collection surface disposed in the middle in the width direction of the exhaust gas passage is disposed at the end in the width direction of the exhaust gas passage. It is characterized in that it is set smaller than the inclination angle of the inclined collection surface.
  • the popcorn ash having a high target flow velocity can reduce the flow velocity and pressure loss at the inclined collection surface with a small inclination angle, and can suppress damage to the popcorn ash collection portion.
  • the plurality of inclined portions have a plurality of inclined collection surfaces that intersect the flow direction of the exhaust gas and extend in the vertical direction, and the inclination direction is reverse to the flow direction of the exhaust gas.
  • the inclined collection surfaces are alternately connected to each other, and the inclination angle of the inclined collection surface disposed in the middle in the vertical direction of the exhaust gas passage is disposed at the end in the vertical direction of the exhaust gas passage. It is characterized in that it is set smaller than the inclination angle of the inclined collection surface.
  • the popcorn ash having a high target flow velocity can reduce the flow velocity and pressure loss at the inclined collection surface with a small inclination angle, and can suppress damage to the popcorn ash collection portion.
  • the inclined collecting surface disposed in the middle in the vertical direction of the exhaust gas passage is closer to the inclined collecting surface disposed at the end in the vertical direction of the exhaust gas passage. It is characterized in that it is disposed to project upstream in the flow direction.
  • the inclined collecting surface disposed at the middle portion in the vertical direction of the exhaust gas passage and the inclined collecting surface disposed at the end portion in the vertical direction of the exhaust gas passage are connected It is characterized in that a collection surface is arranged.
  • the inclined collection is performed on the entire region of the exhaust gas passage.
  • Surfaces can be arranged.
  • the connected collection surface is inclined in a direction intersecting the flow direction of the exhaust gas or the flow direction of the exhaust gas.
  • the connected collection surface is inclined, the collected popcorn ash is less likely to be deposited, and a decrease in collection efficiency can be suppressed.
  • connection portions where the plurality of inclined collection surfaces are connected on the downstream side in the flow direction of the exhaust gas are characterized in that they are disposed substantially in the vertical direction.
  • connection portion between the inclined collection surfaces is disposed along the substantially vertical direction, it is possible to easily drop the popcorn ash collected here, and the decrease in collection efficiency is suppressed. Can.
  • the exhaust gas passage has a first passage and a second passage connected in a direction substantially orthogonal to each other and connected along the flow direction of the exhaust gas, the first passage and the second passage.
  • a hopper capable of storing popcorn ash is provided below the communication portion with the second passage, the heat recovery portion is provided upstream of the first passage or the first passage, and the second passage or the second passage is provided.
  • the harmful substance removing unit is provided downstream of the passage, and the popcorn ash collecting unit is provided in the second passage.
  • the popcorn ash collecting portion by arranging the popcorn ash collecting portion at an appropriate position, it is possible to suppress damage to the popcorn ash collecting portion due to popcorn ash, and it is possible to properly collect popcorn ash.
  • a popcorn ash collecting portion capable of collecting popcorn ash in the exhaust gas is provided between the heat recovery portion and the harmful substance removing portion in the exhaust gas passage capable of flowing combustion gas.
  • the popcorn ash collecting portion is provided with a plurality of inclined portions inclined at a predetermined inclination angle with respect to the flow direction of the exhaust gas, and the inclination angle of the inclined portion disposed at the central portion of the exhaust gas passage is the outer peripheral portion of the exhaust gas passage Since the inclination angle of the inclined portion disposed at the lower side is set smaller, damage to the popcorn ash collecting portion due to the popcorn ash is suppressed, and the popcorn ash can be properly collected.
  • FIG. 1 is a schematic configuration diagram showing a pulverized coal burning boiler to which an exhaust gas processing device according to a first embodiment of the present invention is applied.
  • FIG. 2 is a schematic side view showing the exhaust gas processing system of the first embodiment.
  • FIG. 3 is a schematic plan view showing the exhaust gas processing system of the first embodiment.
  • FIG. 4 is a schematic view showing the popcorn ash collecting unit of the first embodiment.
  • FIG. 5 is a front view of a popcorn ash collecting portion in an exhaust gas processing system according to a second embodiment of the present invention.
  • FIG. 6 is a plan view of the popcorn ash collecting unit of the second embodiment.
  • FIG. 7 is a side view of the popcorn ash collecting unit of the second embodiment.
  • FIG. 1 is a schematic configuration diagram showing a pulverized coal burning boiler to which an exhaust gas processing device according to a first embodiment of the present invention is applied.
  • FIG. 2 is a schematic side view showing the exhaust gas processing system of the first embodiment.
  • FIG. 3 is
  • FIG. 8 is a front view of a popcorn ash collecting unit in an exhaust gas processing system according to a third embodiment of the present invention.
  • FIG. 9 is a side view of the popcorn ash collecting unit of the third embodiment.
  • FIG. 10 is a front view of a popcorn ash collecting unit in an exhaust gas processing system according to a fourth embodiment of the present invention.
  • FIG. 11 is a side view of the popcorn ash collecting unit of the fourth embodiment.
  • FIG. 12 is a front view of a popcorn ash collecting portion in an exhaust gas processing system according to a fifth embodiment of the present invention.
  • FIG. 13 is a side view of the popcorn ash collecting unit of the fifth embodiment.
  • the present invention is not limited to the embodiments, and in the case where there are a plurality of embodiments, the present invention also includes those configured by combining the respective embodiments.
  • FIG. 1 is a schematic configuration view showing a pulverized coal burning boiler to which an exhaust gas treatment apparatus according to a first embodiment of the present invention is applied
  • FIG. 2 is a schematic side view showing an exhaust gas treatment apparatus according to the first embodiment
  • FIG. FIG. 4 is a schematic plan view showing the exhaust gas processing apparatus of the first embodiment
  • FIG. 4 is a schematic view showing a popcorn ash collecting portion of the first embodiment.
  • the pulverized coal burning boiler to which the exhaust gas processing apparatus of Example 1 is applied uses the pulverized coal obtained by pulverizing coal as a solid fuel, burns the pulverized coal by a combustion burner, and recovers the heat generated by the combustion. It is a possible boiler.
  • the pulverized coal burning boiler 10 is a conventional boiler, and has a furnace 11 and a combustion apparatus 12.
  • the furnace 11 has a hollow shape of a square cylinder and is installed along the vertical direction, and the combustion apparatus 12 is provided at the lower part of the furnace wall constituting the furnace 11.
  • the combustion apparatus 12 has a plurality of combustion burners 21, 22, 23, 24, 25 mounted on the furnace wall.
  • four combustion burners 21, 22, 23, 24, 25 are disposed at equal intervals along the circumferential direction, and five sets along the vertical direction, that is, as one set. Five stages are arranged.
  • each combustion burner 21,22,23,24,25 is connected with pulverized coal machine (mill) 31,32,33,34,35 via pulverized coal supply pipe 26,27,28,29,30 ing.
  • the pulverized coal machine 31, 32, 33, 34, 35 is not shown, but the pulverizing table is rotatably supported within the housing with a rotational axis along the vertical direction, and is opposed to the upper side of the pulverizing table A plurality of grinding rollers are rotatably supported in association with the rotation of the grinding table.
  • the pulverized coal which has been pulverized to a predetermined size and classified by the carrier air is divided into pulverized coal supply pipes 26, 27. , 28, 29, 30 to the combustion burners 21, 22, 23, 24, 25 can be supplied.
  • a wind box 36 is provided at the mounting position of each of the combustion burners 21, 22, 23, 24, 25 and one end of an air duct 37 is connected to the wind box 36.
  • a blower 38 is mounted at the other end. Therefore, the combustion air (secondary air, tertiary air) sent by the blower 38 is supplied from the air duct 37 to the air box 36, and the air box 36 supplies the combustion burners 21, 22, 23, 24, 25. Can be supplied.
  • the combustion burners 21, 22, 23, 24, 25 can blow a pulverized fuel mixture (fuel gas) obtained by mixing pulverized coal and primary air into the furnace 11.
  • the secondary air can be blown into the furnace 11, and a flame can be formed by igniting the pulverized fuel mixture with an ignition torch (not shown).
  • each of the combustion burners 21, 22, 23, 24, 25 injects oil fuel into the furnace 11 to form a flame.
  • the flue 40 is connected to the upper part of the furnace 11 and superheaters (superheaters) 41 and 42 for recovering the heat of the exhaust gas as a convection heat transfer part (heat recovery part) are connected to the flue 40.
  • Heaters 43 and 44 and economizers 45, 46 and 47 are provided, and heat exchange is performed between the exhaust gas generated by the combustion in the furnace 11 and water.
  • the flue 40 is connected downstream with an exhaust gas pipe (exhaust gas passage) 48 through which the exhaust gas subjected to heat exchange is discharged.
  • the exhaust gas pipe 48 is provided with an air heater 49 between it and the air duct 37, and performs heat exchange between the air flowing through the air duct 37 and the exhaust gas flowing through the exhaust gas pipe 48, and the combustion burners 21, 22, 23, The temperature of the combustion air supplied to 24, 25 can be raised.
  • the exhaust gas pipe 48 is provided with a selective reduction catalyst 50 at a position upstream of the air heater 49, and at a position downstream of the air heater 49, an electrostatic precipitator 51, an induction fan 52 and a desulfurization device 53 are provided.
  • a chimney 54 is provided in the Here, the selective reduction catalyst 50, the electrostatic precipitator 51, and the desulfurizer 53 function as a harmful substance removing unit.
  • the pulverized coal machine 31, 32, 33, 34, 35 is driven, the pulverized coal produced together with the transfer air passes through the pulverized coal supply pipe 26, 27, 28, 29, 30 and the combustion burners 21, 22, 23, 23, 24 and 25 are supplied. Further, the heated combustion air is supplied from the air duct 37 to the combustion burners 21, 22, 23, 24, 25 via the air box 36. Then, the combustion burners 21, 22, 23, 24, 25 blow the pulverized fuel mixture of the pulverized coal and the conveying air into the furnace 11 and also the combustion air into the furnace 11 and ignite at this time. Can form a flame.
  • the pulverized fuel mixture and the combustion air are burned to generate a flame, and when a flame is generated in the lower part in the furnace 11, the combustion gas (exhaust gas) ascends in the furnace 11 and the flue It is discharged to 40.
  • the inside is maintained in a reducing atmosphere by setting the amount of supplied air to be less than the theoretical amount of air with respect to the supplied amount of pulverized coal. Then, the NOx generated by the combustion of the pulverized coal is reduced by the furnace 11, and after that, additional air is additionally supplied to complete the oxidation combustion of the pulverized coal, and the amount of NOx generated by the combustion of the pulverized coal is reduced. .
  • water supplied from a water supply pump (not shown) is preheated by economizers 45, 46 and 47 and then supplied to a steam drum (not shown) and supplied to water pipes (not shown) of the furnace wall. It is heated to become saturated steam and is fed to a steam drum (not shown). Furthermore, saturated steam of a steam drum (not shown) is introduced into the superheaters 41 and 42 and is overheated by the combustion gas. The superheated steam generated by the superheaters 41 and 42 is supplied to a power plant (for example, a turbine etc.) not shown. Further, the steam taken out in the middle of the expansion process in the turbine is introduced into the reheaters 43 and 44, and is again overheated and returned to the turbine.
  • the furnace 11 was demonstrated as a drum type (steam drum), it is not limited to this structure.
  • the exhaust gas passing through the economizers 45, 46, 47 of the flue 40 is subjected to the selective reduction catalyst 50 to remove harmful substances such as NOx by the exhaust gas pipe 48, and the particulate matter is removed by the electrostatic precipitator 51
  • the sulfur content is removed by the desulfurization device 53, the sulfur is discharged from the chimney 54 to the atmosphere.
  • the downstream side of the furnace 11 functions as the exhaust gas processing device of the first embodiment.
  • the heat recovery part (superheaters 41, 42, reheaters 43, 44, economizer 45, 46, 47) and harmful substance removing part (selective reduction) in the exhaust gas pipe 48
  • the popcorn ash collecting portion 61 capable of collecting popcorn ash in the exhaust gas is provided between the catalyst 50, the electrostatic precipitator 51, and the desulfurizing device 53), and the popcorn ash collecting portion 61
  • the inclination angle of the inclined portion disposed at the central portion of the exhaust gas pipe 48 is greater than the inclination angle of the inclined portions disposed at the outer peripheral portion of the exhaust gas pipe 48. It is set small.
  • the exhaust gas pipe 48 has, for example, a rectangular cross section, and a first pipe (first passage) 48a extending along the vertical direction and a second pipe extending along the horizontal direction
  • the first pipe 48a and the second pipe 48b communicate with each other in a direction substantially orthogonal to each other.
  • a heat recovery unit is provided on the first pipe 48a side located upstream of the flowing direction of the exhaust gas
  • a harmful substance removing unit is provided on the second pipe 48b side located downstream of the flowing direction of the exhaust gas
  • the passage area of the second pipe 48b is set smaller than the passage area of the first pipe 48a.
  • the popcorn ash collection part 61 is provided in the 2nd piping 48b.
  • first pipe 48a and the second pipe 48b communicate with the rear end portion and the front end portion, and a hopper 62 capable of storing popcorn ash is provided below the communication portion.
  • the hopper 62 is formed by opposing inclined surfaces so as to narrow the area downward, and the lower end portion is at a position lower than the bottom surface of the second pipe 48b.
  • the hopper 62 not only stores popcorn ash collected and dropped by the popcorn ash collecting portion 61, but also popcorn ash in the exhaust gas flowing directly from the first pipe 48a to the second pipe 48b is directly hopperd 62.
  • the popcorn ash can be discharged downward by opening the opening with an open / close valve (not shown).
  • the popcorn ash collection part 61 is inclined and provided in the inlet part of 2nd piping 48b so that it may be located in the downstream of the flow direction of waste gas from the hopper 62. As shown in FIG.
  • the popcorn ash collecting portion 61 is fixed to brackets 63 and 64 whose upper and lower end portions are fixed to the upper and lower wall surfaces of the inlet portion of the second pipe 48b. And this popcorn ash collection part 61 is inclined and arrange
  • the popcorn ash collecting portion 61 is formed of, for example, a mesh-shaped wire mesh, and includes a large number of openings of 2 mm to 3 mm or less.
  • the popcorn ash collecting portion 61 is not limited to the mesh-like wire mesh, and may be a screen having a longitudinal slit or a lateral slit, a porous body, or the like.
  • a kicker (guide portion) 65 for guiding the exhaust gas to the outside of the corner is provided at the inside of the corner at the communication portion between the first pipe 48a and the second pipe 48b.
  • the kicker 65 projects from the inner wall surface of the lower end portion of the first pipe 48 a to the opposing inner wall surface outside the bend angle inside the bend in the communication portion between the first pipe 48 a and the second pipe 48 b.
  • And has a tapered cross section.
  • the popcorn ash collecting portion 61 has a plurality of (12 in the first embodiment) inclined catches which intersect the flow direction of the exhaust gas and extend in the vertical direction as the plurality of inclined portions described above. It has a collecting surface 66 (66a, 66b, 66c, 66d, 66e, 66f).
  • the respective inclined collection surfaces 66 (66a, 66b, 66c, 66d, 66e, 66f) are alternately connected such that the direction of inclination is opposite to the flow direction of the exhaust gas.
  • the popcorn ash collecting portion 61 collects six slopes from the intermediate position (center line A) in the width direction toward the left and right end portions.
  • the surfaces 66a, 66b, 66c, 66d, 66e and 66f are connected in a zigzag shape and configured. In practice, one mesh-shaped wire mesh is bent at a predetermined position.
  • the exhaust gas is inclined in the flow direction to reduce the passing speed of the popcorn ash particles, thereby making it possible to reduce pressure loss and wear.
  • the twelve inclined collecting surfaces 66a, 66b, 66c, 66d, 66e, 66f are at an intermediate position (center line A) in the width direction of the exhaust gas pipe 48 (second pipe 48b).
  • the inclination angle ⁇ is set to increase toward the left and right end portions. That is, the angles ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4, ⁇ 5, and ⁇ 6 with respect to the flow direction of the exhaust gas at the 12 inclined collection surfaces 66 a, 66 b, 66 c, 66 d, 66 e, and 66 f, ⁇ 1 ⁇ 2 ⁇ 3 ⁇ It is ⁇ 4 ⁇ 5 ⁇ 6.
  • connection portion 67 (67a, 67b, 67c, 67d) to which the inclined collection surfaces 66a, 66b, 66c, 66d, 66e, 66f are connected on the downstream side of the flow direction of the exhaust gas
  • the two pipes 48b) are disposed at substantially the same position in the flow direction of the exhaust gas in the width direction of the two pipes 48b), and are disposed along the substantially vertical direction.
  • the connection portion 67 (67a, 67b, 67c, 67d) is located along the inclination direction of the popcorn ash collecting portion 61 itself.
  • the flow velocity at the left and right ends is relatively low, wear is not severe even if the inclination angle is large, and the inclination angles of the left and right ends are reduced to reduce the inclination angle at the central portion. I'm getting bigger.
  • the exhaust gas flowing through the exhaust gas pipe 48 has its heat recovered by the heat recovery unit (superheaters 41 and 42, reheaters 43 and 44, economizers 45, 46 and 47) After that, it flows downward along the first pipe 48a. Then, the exhaust gas bends the communication part substantially at right angles and flows to the popcorn ash collecting part 61.
  • the heat recovery unit superheaters 41 and 42, reheaters 43 and 44, economizers 45, 46 and 47
  • the exhaust gas is guided to the center side of the communicating portion by the kicker 65 inside the bend in the communicating portion between the first pipe 48a and the second pipe 48b, so that the flow is separated and the flow velocity is lowered. Do. And popcorn ash is collected by the popcorn ash collection part 61 in the exhaust gas. Further, in the exhaust gas flowing outside the bend in the communication portion between the first pipe 48a and the second pipe 48b, part of the popcorn ash comes in contact with the inclined surface of the hopper 62 and falls.
  • the popcorn ash collecting portion 61 is formed by connecting twelve inclined collecting surfaces 66a, 66b, 66c, 66d, 66e, 66f in a zigzag shape, it is possible to capture popcorn ash.
  • the collecting area (opening area) is increased, and popcorn ash is efficiently collected.
  • the middle portion in the width direction of the exhaust gas pipe 48 is set to have a small inclination angle with respect to the end portion of the twelve inclined collection surfaces 66a, 66b, 66c, 66d, 66e, 66f, popcorn As for the ash collection part 61, the opening area of the middle part of the width direction of the exhaust gas pipe 48 is larger than the end.
  • the exhaust gas flowing through the exhaust gas pipe 48 has a relatively high flow velocity at its central portion side, the opening area becomes large at this central portion side, so the exhaust gas (popcorn ash) has inclined collection surfaces 66a, 66b. , 66c, 66d, 66e, 66f deflect the flow to reduce flow velocity and pressure loss.
  • the impact force of popcorn ash on the popcorn ash collecting portion 61 is alleviated, and wear and damage of the popcorn ash collecting portion 61 are suppressed.
  • the popcorn ash collecting unit 61 is inclined, and each inclined collecting surface 66a, 66b, 66c, 66d , 66e and 66f, since the connection parts 67a, 67b, 67c and 67d are substantially in the vertical direction, they are freely dropped and stored in the hopper 62.
  • the exhaust gas from which the popcorn ash has been removed by the popcorn ash collecting unit 61 has the harmful substances removed by the harmful substance removing unit (selective reduction type catalyst 50, electric dust collector 51, desulfurizer 53).
  • the exhaust gas pipe 48 capable of flowing the combustion gas
  • the heat recovery unit provided in the exhaust gas pipe 48 capable of recovering the heat in the exhaust gas
  • the exhaust gas pipe 48 A harmful substance removing unit provided downstream of the heat recovery unit in the flow direction of the exhaust gas and capable of removing harmful substances in the exhaust gas, and provided between the heat recovery unit and the harmful substance removing unit in the exhaust gas pipe 48
  • a plurality of inclined collecting surfaces 66 (66a) which are inclined at a predetermined inclination angle with respect to the flow direction of the exhaust gas as a popcorn ash collecting unit 61.
  • the inclination angle ⁇ 1 of the inclined collection surface 66a disposed on the central side in the width direction of the exhaust gas pipe 48 is disposed on the end side. It is set to be smaller than the inclination angle ⁇ 6 of the surface 66f.
  • the exhaust gas flowing through the exhaust gas pipe 48 is subjected to heat recovery by the heat recovery unit, then popcorn ash is collected by the popcorn ash collection unit 61, and then harmful substances are removed by the harmful substance removal unit.
  • the popcorn ash collection portion 61 has a plurality of inclined collection surfaces 66, the collection area of popcorn ash becomes large, and popcorn ash can be collected efficiently.
  • the inclination angle ⁇ 1 of the inclined collection surface 66a disposed at the central portion of the exhaust gas pipe 48 is set smaller than the inclination angle ⁇ 6 of the inclined collection surface 66f disposed at the end, Since the flow of relatively high flow velocity popcorn ash flowing through the central portion is deflected to reach the inclined collection surface 66, the flow velocity and pressure loss are reduced, and the popcorn ash collection portion 61 of the popcorn ash collection portion 61 by popcorn ash is reduced. Damage is suppressed and popcorn ash can be collected properly.
  • the inclination angle ⁇ 1 of the inclined collection surface 66a is small at the central portion side where the flow velocity of exhaust gas is high, and the inclination angle ⁇ 6 of the inclination collection surface 66f is low at the end portion where the flow velocity of exhaust gas is low. It is set large. Therefore, without unnecessarily expanding the collection area of the popcorn ash collection unit 61, only the necessary parts are expanded, and the popcorn ash in the exhaust gas can be efficiently collected while suppressing the manufacturing cost. Can.
  • connection portions 67 where the plurality of inclined collection surfaces 66 are connected on the downstream side in the flow direction of the exhaust gas are disposed along the substantially vertical direction. Therefore, popcorn ash collected by the inclined collection surface 66 can be easily dropped by the connection portion 67, and a decrease in collection efficiency can be suppressed.
  • a first pipe 48a and a second pipe 48b which communicate with each other in a direction substantially orthogonal to each other are provided as the exhaust gas pipe 48, and the first pipe located upstream of the flow direction of the exhaust gas.
  • a heat recovery unit is provided at 48a
  • a harmful substance removing unit is provided at the second pipe 48b located downstream of the flow direction of the exhaust gas
  • popcorn ash is stored below the communicating portion between the first pipe 48a and the second pipe 48b.
  • a possible hopper 62 is provided, and a popcorn ash collecting portion 61 is provided on the second pipe 48b side.
  • popcorn ash contained in the exhaust gas can be efficiently collected by the popcorn ash collecting portion 61. Further, all the popcorn ash collected by the popcorn ash collecting unit 61 is stored in the hopper 62, and the popcorn ash can be collected efficiently.
  • FIG. 5 is a front view of a popcorn ash collecting unit in an exhaust gas processing apparatus according to a second embodiment of the present invention
  • FIG. 6 is a plan view of the popcorn ash collecting unit of the second embodiment
  • FIG. It is a side view of a popcorn ash collection part.
  • the basic configuration of the exhaust gas processing system is the same as that of the first embodiment, and only the configuration of the popcorn ash collecting portion is different.
  • the popcorn ash collecting portion 71 has a plurality of inclined portions inclined at a predetermined inclination angle with respect to the flowing direction of the exhaust gas, and is disposed at the central portion of the exhaust gas pipe The inclination angle of the portion is set smaller than the inclination angle of the inclined portion disposed on the outer peripheral portion.
  • the popcorn ash collecting portion 71 has a plurality of (six in the second embodiment) inclined collecting surfaces 72 (72a, 72b) intersecting the flow direction of the exhaust gas and extending in the vertical direction as the plurality of inclined portions described above. )have.
  • the inclined collection surfaces 72 (72a, 72b) are alternately connected such that the direction of inclination is opposite to the flow direction of the exhaust gas. That is, in the exhaust gas pipe, the popcorn ash collection portion 71 is configured by connecting six inclined collection surfaces 72 (72a, 72b) in a zigzag shape in the width direction.
  • connection portions 74 to which the inclined collection surfaces 72 (72a, 72b) are connected on the downstream side of the flow direction of the exhaust gas are arranged at substantially the same positions in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe Along the substantially vertical direction.
  • connection portions 75 where the upper inclined surfaces 73a and the lower inclined surfaces 73c are connected on the upstream side of the flow direction of the exhaust gas are disposed at substantially the same positions in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe
  • the connection portion 76 to which the intermediate inclined surface 73b is connected on the upstream side in the flow direction of the exhaust gas is disposed at substantially the same position in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe.
  • middle inclined surface 73b is connected by the upstream of the flow direction of waste gas is the connection part 75 by which each upper inclined surface 73a and each lower inclined surface 73c are connected by the upstream of the flow direction of exhaust gas. Rather, it protrudes and is located in the upstream of the flow direction of waste gas.
  • each inclined collection surface 72 (72a, 72b), the upper inclined surface 73a, the lower inclined surface 73c, and the middle inclined surface 73b are connected by the inclined connection collection surfaces 77a, 77b.
  • the connected collection surface 77a connecting the upper inclined surface 73a and the intermediate inclined surface 73b is inclined downward toward the upstream side in the flow direction of the exhaust gas, and connects the intermediate inclined surface 73b and the lower inclined surface 73c.
  • the connected collection surface 77b is inclined upward on the upstream side in the flow direction of the exhaust gas.
  • each of the inclined collecting surfaces 72 (72a, 72b), the upper inclined surface 73a, the middle inclined surface 73b, and the lower inclined surface 73c are respectively set to the same inclination angle in the width direction of the exhaust gas pipe.
  • the inclination angle may be reduced at the middle portion in the width direction and the inclination angle may be increased at the left and right end portions in the width direction.
  • the exhaust gas flowing through the exhaust gas pipe flows to the popcorn ash collecting unit 71 after heat is recovered by the heat recovery unit, and the popcorn ash collecting unit 71 collects the popcorn ash here.
  • the popcorn ash collecting portion 71 is formed by connecting the six inclined collecting surfaces 72a and 72b in a zigzag shape, the popcorn ash collecting area (opening area) is large. Popcorn ash is collected efficiently.
  • the intermediate inclined surface 73b at an intermediate position in the vertical direction of the exhaust gas pipe is set to have a small inclination angle with respect to the upper inclined surface 73a and the lower inclined surface 73c at the upper and lower positions.
  • the opening area of the middle portion in the vertical direction of the exhaust gas pipe is larger than that of the end portion. Therefore, although the exhaust gas flowing through the exhaust gas pipe has a relatively high flow velocity at the central portion side, the opening area becomes large at the central portion side, so the exhaust gas (popcorn ash) has inclined collection surfaces 73a, 73b, The flow is deflected by 73c to reduce flow velocity and pressure loss. As a result, the impact force of the popcorn ash on the popcorn ash collecting portion 71 is alleviated, and the wear and damage of the popcorn ash collecting portion 71 are suppressed.
  • the connection portions 74 of the inclined collecting surfaces 72a and 72b of the popcorn ash collecting portion 71 extend substantially in the vertical direction. It falls freely because it is After that, the exhaust gas from which the popcorn ash has been removed by the popcorn ash collecting unit 71 has the harmful substance removing unit removing the harmful substances.
  • a plurality of inclined collecting surfaces 72 (72a, 72b) inclined to a predetermined inclination angle with respect to the flowing direction of the exhaust gas are provided.
  • the inclination angle ⁇ 12 of the intermediate inclined surface 73b located at the center of the exhaust gas pipe in the vertical direction is set smaller than the inclination angles ⁇ 11 and ⁇ 13 of the upper inclined surface 73a and the lower inclined surface 73c located at the upper and lower portions.
  • the exhaust gas flowing through the exhaust gas pipe is subjected to heat recovery by the heat recovery unit, then popcorn ash is collected by the popcorn ash collection unit 71, and then harmful substances are removed by the harmful substance removal unit.
  • the inclination angle ⁇ 12 of the intermediate inclined surface 73b of the exhaust gas pipe is set smaller than the inclination angles ⁇ 11 and ⁇ 13 of the upper inclined surface 73a and the lower inclined surface 73c.
  • the flow velocity and the pressure loss are reduced, the damage of the popcorn ash collecting portion 71 by the popcorn ash is suppressed, and the popcorn ash is properly used. Can be collected.
  • the inclination angle ⁇ 11 of the intermediate inclined surface 73b is small at the central portion side where the flow velocity of exhaust gas is high, and the inclination of the upper inclined surface 73a and the lower inclined surface 73c at the end portion where the flow velocity of exhaust gas is low
  • the angles ⁇ 12 and ⁇ 13 are set large. Therefore, without unnecessarily expanding the collection area of the popcorn ash collection unit 71, only necessary parts are expanded, and popcorn ash in the exhaust gas can be efficiently collected while suppressing the manufacturing cost. Can.
  • the intermediate inclined surface 73b located at the center of the exhaust gas pipe in the vertical direction is compared with the upper inclined surface 73a and the lower inclined surface 73c located at the upper and lower parts of the exhaust gas pipe in the vertical direction. It is disposed to project upstream in the flow direction of the exhaust gas. Therefore, popcorn ash in relatively fast flow rate exhaust gas flowing in the central portion of the exhaust gas pipe can be collected efficiently. In addition, the pressure loss and the wear can be reduced by increasing the flow velocity at the central portion of the popcorn ash collecting portion 71 and reducing the inclination angle.
  • the intermediate inclined surface 73b located at the center of the exhaust gas pipe in the vertical direction and the upper inclined surface 73a and the lower inclined surface 73c located at the upper and lower parts of the exhaust gas pipe in the vertical direction.
  • the connected collection surfaces 77a and 77b are arranged to be inclined in the flow direction of the exhaust gas. Therefore, the inclined collection surface can be disposed in the entire area of the exhaust gas pipe, and since the connected collection surfaces 77a and 77b are inclined, the collected popcorn ash is less likely to be deposited, and collection is performed. It is possible to suppress the decrease in efficiency.
  • FIG. 8 is a front view of a popcorn ash collecting unit in an exhaust gas processing system according to a third embodiment of the present invention
  • FIG. 9 is a side view of the popcorn ash collecting unit of the third embodiment.
  • the basic configuration of the exhaust gas processing system is the same as that of the first and second embodiments, and only the configuration of the popcorn ash collecting portion is different.
  • the popcorn ash collecting portion 81 has a plurality of inclined portions inclined at a predetermined inclination angle with respect to the flowing direction of the exhaust gas, and is disposed at the central portion of the exhaust gas pipe The inclination angle of the portion is set smaller than the inclination angle of the inclined portion disposed on the outer peripheral portion.
  • the popcorn ash collecting portion 81 has a plurality of inclined collection surfaces 82 (82a, 82b) intersecting the flow direction of the exhaust gas and extending in the vertical direction as the plurality of inclined portions described above.
  • the inclined collection surfaces 82a and 82b are connected such that the inclination direction is opposite to the flowing direction of the exhaust gas.
  • the inclined collecting surfaces 82a and 82b are respectively composed of an upper inclined surface 83a, an intermediate inclined surface 83b, and a lower inclined surface (not shown) in the vertical direction of the exhaust gas pipe.
  • the inclination angle of the intermediate inclined surface 83b is set smaller than the inclination angle of the upper inclined surface 83a and the lower inclined surface.
  • the connecting portions 84 where the inclined collection surfaces 82a and 82b are connected on the downstream side of the flow direction of the exhaust gas are disposed at substantially the same positions in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe It is arranged along the vertical direction.
  • the upper inclined surface 83a and the connecting portion 85 connected on the upstream side in the flow direction of the exhaust gas are disposed at substantially the same position in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe.
  • the connection part 86 connected on the upstream side of the flow direction of the exhaust gas is disposed at substantially the same position in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe.
  • the connecting portion 86 in which the intermediate inclined surface 83b is connected on the upstream side in the flow direction of the exhaust gas is higher than the connecting portion 85 in which the upper inclined surface 83a and the lower inclined surface 83c are connected on the upstream side in the flow direction of the exhaust gas. It is positioned to project upstream in the flow direction of the exhaust gas.
  • each of the inclined collection surfaces 82a and 82b the upper inclined surface 83a and the middle inclined surface 83b are connected by two inclined connection collection surfaces 87a and 87b.
  • the connecting collection surface 87a located on the upper side is inclined upward toward the upstream side in the flow direction of the exhaust gas
  • the lower connection collection surface 87b is on the lower side upstream in the flow direction of the exhaust gas It is inclined.
  • each connected collection surface 87a, 87b is inclined toward the direction intersecting the flow direction of the gas. That is, between the upper inclined surface 83a and the intermediate inclined surface 83b, a concave portion is formed by the two connection collection surfaces 87a and 87b, and the enlargement of the collection surface is further achieved.
  • the popcorn ash is collected by the popcorn ash collecting unit 81 in the exhaust gas flowing through the exhaust pipe.
  • the intermediate inclined surface 83b is set to have a small inclination angle with respect to the upper inclined surface 83a and the lower inclined surface, the flow velocity flowing through the central portion of the exhaust gas pipe is relatively low. Fast exhaust gases have their flow rates and pressure losses reduced. As a result, the impact force of the popcorn ash on the popcorn ash collecting portion 81 is alleviated, and the wear and damage of the popcorn ash collecting portion 81 are suppressed.
  • a plurality of inclined collecting surfaces 82 (82a, 82b) inclined to a predetermined inclination angle with respect to the flowing direction of the exhaust gas.
  • the inclination angle of the intermediate inclined surface 83b located at the center of the exhaust gas pipe in the vertical direction is set smaller than the inclination angles of the upper inclined surface 83a and the lower inclined surface located at the upper and lower portions.
  • the relatively fast flow velocity of popcorn ash flowing through the central portion of the exhaust gas pipe is deflected to reach the intermediate inclined surface 83b, so that the flow velocity and pressure loss are reduced, and popcorn ash capture by popcorn ash is achieved. Damage to the collecting portion 81 is suppressed, and popcorn ash can be collected properly.
  • the inclined collection surface can be disposed in the entire area of the exhaust gas pipe, and since the connected collection surfaces 87a and 87b are inclined, the collected popcorn ash is less likely to be deposited, and collection is performed. It is possible to suppress the decrease in efficiency.
  • FIG. 10 is a front view of a popcorn ash collecting unit in an exhaust gas processing system according to a fourth embodiment of the present invention
  • FIG. 11 is a side view of the popcorn ash collecting unit of the fourth embodiment.
  • the basic configuration of the exhaust gas processing system is the same as that of the first and second embodiments, and only the configuration of the popcorn ash collecting portion is different.
  • the popcorn ash collecting portion 91 has a plurality of inclined portions inclined at a predetermined inclination angle with respect to the flowing direction of the exhaust gas, and is disposed at the central portion of the exhaust gas pipe The inclination angle of the portion is set smaller than the inclination angle of the inclined portion disposed on the outer peripheral portion.
  • the popcorn ash collecting portion 91 has a plurality of inclined collecting surfaces 92 (92a, 92b) which intersect the flow direction of the exhaust gas and extend in the vertical direction as the plurality of inclined portions described above.
  • the collection surfaces 92a and 92b are composed of an upper inclined surface 93a, an intermediate inclined surface 93b and a lower inclined surface (not shown), and the inclination angle of the intermediate inclined surface 93b is smaller than the inclination angles of the upper inclined surface 93a and the lower inclined surface It is done.
  • connection portions 94 to which the inclined collection surfaces 92a and 92b are connected on the downstream side of the flow direction of the exhaust gas are disposed at substantially the same position in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe It is arranged along.
  • the upper inclined surface 93a and the connecting portion 95 connected on the upstream side in the flow direction of the exhaust gas are disposed at substantially the same positions in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe.
  • the connection portion 96 connected on the upstream side of the flow direction of the exhaust gas is disposed at substantially the same position in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe.
  • the connection portion 96 is closer to the flow direction of the exhaust gas than the connection portion 95 It protrudes from the upstream side.
  • the upper inclined surface 93a and the middle inclined surface 93b are connected by two inclined connected collection surfaces 97a and 97b.
  • the central portion of the connected collection surface 97a located on the upper side has a concave shape, and is inclined toward the upper side on the upstream side in the flow direction of the exhaust gas
  • the central portion of the lower connected collection surface 97b is It has a convex shape and is inclined downward toward the upstream side in the flow direction of the exhaust gas. That is, between the upper inclined surface 93a and the intermediate inclined surface 93b, a concave portion is formed by the two connection collection surfaces 97a and 97b, and the enlargement of the collection surface is further achieved.
  • FIG. 12 is a front view of a popcorn ash collecting unit in an exhaust gas processing system according to a fifth embodiment of the present invention
  • FIG. 13 is a side view of the popcorn ash collecting unit of the fifth embodiment.
  • the basic configuration of the exhaust gas processing system is the same as that of the first and second embodiments, and only the configuration of the popcorn ash collecting portion is different.
  • the popcorn ash collecting unit 101 has a plurality of inclined portions inclined at a predetermined inclination angle with respect to the flowing direction of the exhaust gas, and is disposed at the central portion of the exhaust gas pipe The inclination angle of the portion is set smaller than the inclination angle of the inclined portion disposed on the outer peripheral portion.
  • the popcorn ash collection unit 101 has a plurality of inclined collection surfaces 102 (102a, 102b) along the vertical direction while intersecting the flow direction of the exhaust gas as the plurality of inclined portions described above, and each inclination is
  • the collection surfaces 102a and 102b are composed of an upper inclined surface 103a, an intermediate inclined surface 103b and a lower inclined surface (not shown), and the inclination angle of the intermediate inclined surface 103b is set smaller than that of the upper inclined surface 103a and the lower inclined surface It is done.
  • connection portions 104 to which the inclined collection surfaces 102a and 102b are connected on the downstream side of the flow direction of the exhaust gas are disposed at substantially the same position in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe It is arranged along.
  • the upper inclined surface 103a and the connection portion 105 connected on the upstream side in the flow direction of the exhaust gas are disposed at substantially the same positions in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe.
  • the connection portion 106 connected on the upstream side of the flow direction of the exhaust gas is disposed at substantially the same position in the flow direction of the exhaust gas in the width direction of the exhaust gas pipe. It protrudes from the upstream side.
  • the upper inclined surface 103a and the middle inclined surface 103b are connected by two inclined connected collection surfaces 107a and 107b.
  • the upper inclined surface 103a is set to have the same inclination angle on the inclined collection surfaces 102a and 102b, but the intermediate inclined surface 103b is inclined and collected on the inclined collection surface 102a.
  • the angle is set to be smaller than the angle on the surface 102 b side.
  • the central portion of the connected collection surface 107a located on the upper side has a concave shape, and is inclined toward the upper side on the upstream side in the flow direction of the exhaust gas
  • the central portion of the lower connected collection surface 107b is It has a convex shape and is inclined downward toward the upstream side in the flow direction of the exhaust gas.
  • the lower connected collection surface 107b is inclined toward the inclined collection surface 102a. That is, between the upper inclined surface 103a and the intermediate inclined surface 103b, a concave portion is formed by the two connected collection surfaces 107a and 107b, and the collection surface is further enlarged.
  • the exhaust gas pipe 48 communicates the first pipe 48a extending along the vertical direction with the second pipe 48b extending along the horizontal direction, and the hopper 62 is formed here.
  • the popcorn ash collecting parts 61, 71, 81, 91, and 101 are provided at the inlet of the second pipe 48b
  • the present invention is not limited to this configuration.
  • the exhaust pipe 48 includes a first pipe (first passage) extending along the vertical direction, a second pipe (first passage) extending along the horizontal direction, and a third pipe (third path) extending along the vertical direction.
  • a hopper may be formed in each communicating portion to communicate with the second passage, and a popcorn ash collecting portion may be provided at the inlet of the third pipe.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Separating Particles In Gases By Inertia (AREA)
PCT/JP2012/081343 2012-01-30 2012-12-04 排ガス処理装置 WO2013114721A1 (ja)

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JP2012017332A JP5762325B2 (ja) 2012-01-30 2012-01-30 排ガス処理装置
JP2012-017332 2012-01-30

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JPH1176729A (ja) * 1997-09-10 1999-03-23 Tennex:Kk 室内空気処理用のフィルタ部材
US20050061261A1 (en) * 2002-06-20 2005-03-24 Klaus Grommes Coal-fired power station

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JPS5827968B2 (ja) * 1975-12-04 1983-06-13 エアハルト・チヤルルス・アンドレア 伸張自在ガスフイルタ
JPH0641613Y2 (ja) * 1988-12-27 1994-11-02 株式会社土屋製作所 ▲ろ▼過素子
JPH03196805A (ja) * 1989-02-08 1991-08-28 Hans-Joachim Lippold フィルタカートリッジ
JPH1176729A (ja) * 1997-09-10 1999-03-23 Tennex:Kk 室内空気処理用のフィルタ部材
US20050061261A1 (en) * 2002-06-20 2005-03-24 Klaus Grommes Coal-fired power station

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JP5762325B2 (ja) 2015-08-12
TW201339507A (zh) 2013-10-01
CN103998865A (zh) 2014-08-20
CN103998865B (zh) 2016-04-20
JP2013155938A (ja) 2013-08-15

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