JP6201470B2 - Boiler equipment - Google Patents

Description

  The present invention relates to a boiler device that uses a hydrous material containing a large amount of water as a fuel to improve boiler efficiency.

  In recent years, it has been required to use a high moisture content biomass or a water content such as a low grade coal such as a high moisture content lignite as a fuel for a boiler.

  Conventionally, when a high water content is used as fuel for a boiler, it is first dried with a dryer, then pulverized to 300 μm or less with a fine pulverizer, and the finely pulverized fine powder is supplied to a burner and burned in a boiler furnace. Yes.

  As a conventional boiler apparatus, there is one using a beater mill (rough crusher). Part of the combustion gas extracted from the furnace of the boiler is introduced into the coarse pulverizer. The coarse pulverizer is dried by the combustion gas while being coarsely pulverized by the coarse pulverizer. Further pulverization produces fine powder.

  In the case of the above-described conventional boiler device, there is a problem that the boiler efficiency is poor because the moisture content of the hydrated material is evaporated by the heat in the furnace of the boiler.

  Another example of a conventional boiler apparatus uses a drying apparatus. The raw coal is dried by a drying device, and the dried raw coal is finely pulverized by a pulverized coal machine to produce dried fine powder. However, the pulverized coal machine consumes more power than the coarse pulverizer and has a running cost. It takes.

  In Patent Document 1, product coal dried by a low-grade coal drying system is pulverized into pulverized coal by a mill, gasified in a coal gasification furnace to generate gasified gas, and the gasified gas is gas purified. After that, a coal gasification combined power generation system that burns in a combustor of a gas turbine to generate high-temperature and high-pressure combustion gas is disclosed.

JP 2011-214812 A

  In view of such circumstances, the present invention provides a boiler device that improves boiler efficiency and reduces costs.

  The present invention includes a pulverizer that coarsely pulverizes a massive hydrated product into a coarse powder, a drying system that dries the coarse powder and supplies the dried coarse powder, a coarse powder that is provided on a furnace wall of a furnace and uses the coarse powder as fuel. The present invention relates to a boiler apparatus comprising a burner having a plasma torch as a fire source and a carrier medium supply means for introducing primary air and supplying the coarse powder to the burner as a coarse powder mixed flow mixed with the primary air. Is.

  According to the present invention, the burner comprises a nozzle main body and a combustion air adjusting device provided so as to surround the tip of the nozzle main body, and the nozzle main body is provided concentrically with the inner cylinder nozzle. The outer cylinder nozzle and the plasma torch provided so that the tip is close to the tip of the fuel conduction space, and the fuel conduction space is formed between the inner cylinder nozzle and the outer cylinder nozzle. The coarse powder mixture flow is supplied to the fuel conduction space, the coarse powder mixture flow is ejected in a ring shape from the fuel conduction space, and the plasma formed by the plasma torch intersects the coarse powder mixture flow. This relates to a boiler apparatus.

  In the present invention, the coarse powder mixed flow uses primary air at normal temperature as a carrier medium, and secondary combustion air at normal temperature is supplied from the combustion air adjusting device when the boiler is started. The present invention relates to a boiler apparatus to which room temperature tertiary combustion air is supplied.

  In the present invention, the outer cylinder nozzle and the inner cylinder nozzle are configured such that at least a part of the front end portion of the fuel conduction space faces the center of the nozzle body, and the plasma formed by the plasma torch is The present invention relates to a boiler device configured to intersect with the coarse powder mixed flow.

  Furthermore, the present invention relates to the boiler device, wherein the coarse powder mixed flow is a high-concentration coarse powder mixed flow in which the amount of air in the carrier medium is set so as to suppress spontaneous combustion of the coarse powder being conveyed. Is.

  According to the present invention, a pulverizer for coarsely pulverizing a massive hydrated product into coarse powder, a drying system for drying the coarse powder and supplying the dried coarse powder, and the coarse powder provided on a furnace wall of a furnace as fuel. And a burner having a plasma torch as an ignition source, and a carrier medium supply means for introducing primary air and supplying the coarse powder to the burner as a coarse powder mixed flow mixed with the primary air. It does not require a pulverizer for finely pulverizing the hydrated material, can simplify the apparatus configuration and reduce the cost, and can achieve boiler efficiency without bringing moisture into the furnace. Show the effect.

It is the schematic which shows the boiler apparatus which concerns on the Example of this invention. It is the schematic which shows the hydrated matter drying system applied to the boiler apparatus which concerns on the Example of this invention. (A) is a schematic sectional view of the burner according to the first embodiment, (B) is a partial view showing the relationship between the coarse powder mixed flow and the plasma in the first embodiment. It is a schematic sectional drawing of the burner which concerns on a 2nd Example. It is a fragmentary figure which shows the relationship between the coarse powder mixed flow and plasma in a 3rd Example.

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

  First, referring to FIG. 1, a boiler device 1 to which a hydrated matter drying system according to an embodiment of the present invention is applied will be described.

  In FIG. 1, 2 indicates a furnace of the boiler device 1, and 3 indicates a burner provided on the furnace wall of the furnace 2. The furnace wall of the furnace 2 is provided with a heat transfer tube (not shown) for absorbing radiant heat from the inside of the furnace, and a super heater (superheated steam generation) for heating the generated steam above the furnace 2. 4) is provided.

  In FIG. 1, reference numeral 5 denotes a hydrated material drying system for drying hydrated materials such as biomass and low-grade coal containing a large amount of moisture. When a hydrous material, for example, massive lignite 6 is supplied to the hydrated material drying system 5, the lignite 6 is coarsely pulverized and dried by the hydrated material drying system 5 to obtain coarse coal (dry coarse powder). The dried lignite 7 is supplied to the burner 3.

  By supplying the dry lignite 7 to the burner 3, the dry lignite 7 is burned in the burner 3, and a flame is formed in the furnace 2. The combustion exhaust gas 8 generated by the combustion heats the inside of the furnace 2 and exchanges heat with the super heater 4 to be exhausted through the flue 9.

  Next, referring to FIG. 2, the hydrated material drying system 5 will be described.

  In FIG. 2, reference numeral 11 denotes a pulverizer that pulverizes the lignite coal 6 into coarse coal having a predetermined particle size, for example, 2 mm or less. For example, a hammer mill or the like is used as the pulverizer 11.

In FIG. 2, reference numeral 12 denotes a drying device in which a drying chamber 13 for drying the pulverized lignite 6 is formed, and a lignite supply line 14 is connected to the upper part of the side wall of the drying chamber 13.
The pulverizer 11 is provided in the middle of the lignite supply line 14, and a lignite hopper 15 capable of storing the pulverized lignite 6 is connected to the downstream side of the pulverizer 11. A cutting device 16 for adjusting the cutting amount of the lignite 6 to the drying chamber 13 is connected to the side. The pulverizer 11, the lignite supply line 14, the lignite hopper 15, and the cutting device 16 constitute water content supply means.

  Further, a lignite discharge line 17 is connected to the lower part of the other side wall of the drying chamber 13, and the lignite discharge line 17 is connected to the middle part of the first transfer line 18. The first transport line 18 is provided with a blower 21 that supplies the first transport air 19 to the first transport line 18. By supplying the first transfer air 19 as a transfer medium from the blower 21, the dry lignite 7, which is coarse pulverized coal dried by the drying device 12, passes through the first transfer line 18. 1 is transported integrally with the transporting air 19.

  The first transfer air 19 supplied from the blower 21 has a normal temperature, for example, 60 ° C. or less, and prevents the dry lignite 7 from being ignited during the transfer.

  The first transfer line 18 is provided with a first separation device 22 such as a cyclone that separates the dry lignite 7 having a large particle size and the first transfer air 19, and the downstream side of the first separation device 22. Is provided with a second separator 23 such as a bag filter for further separating the fine powder of the dried lignite 7 from the first transfer air 19 separated by the first separator 22.

  Further, an exhaust line 24 is connected to the second separation device 23, and the first conveyance in which the dry lignite 7 is separated by the first separation device 22 and the second separation device 23 through the exhaust line 24. The working air 19 is exhausted to the outside.

  A rotary valve 25 is provided below the first separator 22, and rotary valves 26 and 27 are provided below the second separator 23. The first separator 22, the second separator Reference numerals 23 are respectively connected to a bunker 28 which is a storage container for storing the dried lignite 7 through the rotary valves 25 to 27. Below the bunker 28 is provided a measuring device 31 for feeding a predetermined amount of the dry lignite 7 from the dry lignite 7 stored in the bunker 28 to the second transport line 29.

  The second transport line 29 is provided with a blower 33 as a transport medium supply means for supplying the second transport air 32 which is primary air into the second transport line 29. By supplying the second conveying air 32 from the blower 33, the second conveying air 32 is integrated with the dry lignite 7 cut out from the measuring device 31, and the second conveying line 29 is Then, it is conveyed to the burner 3 as a coarse powder mixed flow 47 (see FIG. 3).

  The second conveying air 32 supplied from the blower 33 is at room temperature, and further prevents the dry lignite 7 from igniting during conveyance as a minimum flow rate that functions as a conveyance medium, Boiler efficiency decline due to room temperature air is suppressed.

  Next, an example of the burner 3 according to the first embodiment of the present invention will be described with reference to FIG.

  In FIG. 3, reference numeral 35 denotes a furnace wall of the furnace 2. The burner 3 is arranged in a required number and in a plurality of stages in the horizontal direction along the wall surface of the lower part of the furnace 2 of the boiler.

  A throat 36 is provided on the furnace wall 35, and a wind box 37 is attached to the furnace wall 35 on the side of the anti-fire furnace 2, and the burner 3 is provided concentrically with the throat 36 inside the wind box 37. A combustion air supply path 38 is connected to the window box 37. A secondary air adjusting device 39 that is a combustion air adjusting device is provided at the front end portion (end portion inside the furnace 2) of the wind box 37, and the secondary air adjusting device 39 is concentric with the throat 36. Yes.

  The burner 3 includes a nozzle main body 41 and the secondary air adjusting device 39, and the secondary air adjusting device 39 is provided so as to surround the tip end portion (end portion inside the furnace) of the nozzle main body 41. Yes.

  The nozzle body 41 includes an outer cylinder nozzle 42 and an inner cylinder nozzle 43 that are provided in a concentric multiple cylinder shape, and a plasma torch 44 that is accommodated in the inner cylinder nozzle 43.

  The cross sections of the outer cylinder nozzle 42 and the inner cylinder nozzle 43 are circular, and the furnace 2 side end is opened between the outer cylinder nozzle 42 and the inner cylinder nozzle 43 in a hollow cylindrical space. The formed fuel conduction space 45 is formed.

  The ratio of the cross-sectional area (flow path area) of the fuel conducting space 45 to the cross-sectional area (flow path area) of the inner cylinder nozzle 43 is such that the cross-sectional area of the inner cylinder nozzle 43 is the cross-sectional area of the fuel conducting space 45. As a result, an arbitrary multiple of 10 times or less, preferably 1: 5 to 1:10, and the cross-sectional area of the inner cylinder nozzle 43 is set to be significantly larger than the cross-sectional area of the fuel conduction space 45. Therefore, the fuel conduction space 45 has a thin ring shape formed around the inner cylinder nozzle 43.

  A lignite supply pipe 46 communicates with the base of the outer cylinder nozzle 42 (the end on the counter-fired furnace 2 side), and the lignite supply pipe 46 is connected to the metering via the second transfer line 29 (see FIG. 2). It is connected to the vessel 31 (see FIG. 2) and the bunker 28 (see FIG. 2). The dry lignite 7 is supplied from the meter 31 and the bunker 28 using the second transfer air 32 (see FIG. 2) as a transfer medium, and the mixed flow of the second transfer air 32 and the dry lignite 7 The coarse powder mixed flow 47 flows into the fuel conduction space 45 through the lignite supply pipe 46, flows through the fuel conduction space 45, and is ejected from the tip of the fuel conduction space 45.

  One end of a tertiary air introduction pipe 48 opens at the base of the inner cylinder nozzle 43, and the other end of the tertiary air introduction pipe 48 opens into the combustion air supply path 38 to supply to the wind box 37. A part of the secondary combustion air 49 is taken in and led to the inner cylinder nozzle 43 as auxiliary combustion air, that is, tertiary combustion air 51. A damper 50 as a tertiary air adjusting device is provided in the middle of the tertiary air introducing pipe 48 to adjust the flow rate of the tertiary combustion air 51. The damper 50 is unitized and can be attached to and detached from the tertiary air introduction pipe 48.

  The secondary air adjustment device 39 includes an auxiliary air adjustment mechanism 52 that houses the tip of the nozzle body 41 and a main air adjustment mechanism 53 that is provided concentrically outside the auxiliary air adjustment mechanism 52. Yes.

  A main duct 54 is provided concentrically with the nozzle body 41. The main duct 54 is reduced in diameter toward the tip and is continuous with the throat 36. A sub duct 55 is provided inside the main duct 54 concentrically with the main duct 54. The sub duct 55 is substantially similar to the main duct 54 and has a shape that decreases in diameter toward the tip, and a secondary air outlet space 56 is formed between the main duct 54 and the sub duct 55. Is done. Further, a sub secondary air outlet space 57 is formed between the sub duct 55 and the nozzle body 41.

  A partition wall plate 58 facing the main duct 54 and the sub duct 55 in common is provided concentrically with the nozzle body 41.

  A large number of outer air vanes 59 are provided between the periphery of the main duct 54 and the partition wall plate 58 so as to be rotatable at equal circumferential intervals, and the outer air vanes 59 are linked mechanisms (not shown). The tilt angle with respect to the air flow can be changed.

  A large number of inner air vanes 61 are provided between the peripheral portion of the sub duct 55 and the partition wall plate 58 so as to be rotatable at equal circumferential intervals. The inner air vanes 61 are the same as the outer air vanes 59. In addition, it can be rotated synchronously via a link mechanism (not shown), and the inclination angle with respect to the air flow can be changed.

  The main air adjustment mechanism 53 is constituted by the main duct 54, the outer air vane 59 and the like, and the auxiliary air adjustment mechanism 52 is constituted by the sub duct 55 and the inner air vane 61.

  The front end of the main duct 54 is continuous with the throat 36, and the front end of the sub duct 55 is in a position retracted from the inner wall surface of the furnace wall 35, and the outer cylinder nozzle 42 and the inner cylinder nozzle 43 The tips are at the same position, and the tips of the outer cylinder nozzle 42 and the inner cylinder nozzle 43 are in the vicinity of the tip of the sub duct 55.

  The nozzle body 41 will be further described.

  The nozzle body 41 is provided with the window box 37 penetrating from the side of the counter-fired furnace 2 and the tip portion penetrating the partition wall plate 58.

  A circular front end side flange 62 is provided on the front end side of the outer cylinder nozzle 42, and the front end side flange 62 comes into contact with the partition wall plate 58 from the reaction furnace 2 side. 62 is in contact with the partition wall plate 58 so that the tip of the nozzle body 41 is positioned. Further, the front end side flange 62 closes the outer cylinder nozzle penetrating portion of the partition wall plate 58.

  A cylindrical nozzle holder 64 is provided at a portion where the nozzle body 41 passes through the wall 63 of the window box 37. The inner diameter of the nozzle holder 64 is larger than the outer diameter of the distal end side flange 62.

  On the base end side of the nozzle body 41, a circular base end side flange 65 that abuts the nozzle holder 64 is provided, and the base end side flange 65 abuts the nozzle holder 64 from the reaction furnace 2 side, The base end side flange 65 is fixed to the nozzle holder 64 by a fixing tool such as a bolt. Thus, the outer cylinder nozzle 42 is fixed to the window box 37 via the proximal end side flange 65 and the nozzle holder 64.

  An outer cylinder end plate 66 is fixed to the proximal end of the nozzle body 41, and the proximal end of the nozzle body 41 is closed.

  The inner cylinder nozzle 43 is provided in the outer cylinder nozzle 42 by being inserted from the side of the reaction furnace 2.

  An inner cylinder nozzle fixing flange 67 is provided on the tip side of the inner cylinder nozzle 43 from the position where the tertiary air introduction pipe 48 communicates, and the inner cylinder nozzle fixing flange 67 contacts the outer cylinder end plate 66. The inner cylinder nozzle fixing flange 67 and the outer cylinder end plate 66 are fixed by a fastener such as a bolt, and the inner cylinder nozzle 43 is attached to the outer cylinder nozzle 42.

  An inner cylinder end plate 68 is fixed to the base end of the inner cylinder nozzle 43, and the base end of the inner cylinder nozzle 43 is closed by the inner cylinder end plate 68. The inner cylinder end plate 68 is provided with a cylindrical plasma torch holder 69. The axis of the plasma torch holder 69 passes through a position off the center of the inner cylinder end plate 68 and is inclined with respect to the axis of the inner cylinder nozzle 43.

  In the figure, the axis of the plasma torch holder 69 passes through a position deviated downward from the center of the inner cylinder end plate 68, and the axis is inclined so as to rise toward the tip. .

  The plasma torch 44 is inserted into the plasma torch holder 69 and supported by the inner cylinder end plate 68 through the plasma torch holder 69. Accordingly, the attached plasma torch 44 is inclined so that the axis rises toward the tip.

  Further, the tip of the plasma torch 44 is in a state of being substantially coincident with the tip of the inner cylinder nozzle 43, and is the tip of the plasma torch 44 in contact with the inner surface of the inner cylinder nozzle 43? , It will be in a state of close proximity so as to be substantially in contact.

  The tip position is adjusted by sliding the plasma torch 44 with respect to the plasma torch holder 69.

  The operation will be described below.

  First, the unpulverized lump of lignite 6 is charged into the pulverizer 11. The lignite 6 is roughly pulverized by the pulverizer 11 so that the particle size is about 2 mm or less, and the lignite 6 pulverized by the pulverizer 11 is stored in the lignite hopper 15. The amount of the lignite 6 stored in the lignite hopper 15 is adjusted by the slicing device 16 and is fed into the drying chamber 13 of the drying device 12 through the lignite supply line 14.

  The lignite 6 charged into the drying chamber 13 is fluidized by supplying a fluid medium such as steam in the drying chamber 13 and heated in the process of flowing toward the lignite discharge line 17 to dry the lignite. Is done.

  The dried lignite (coarse coal) 7 discharged from the drying chamber 13 is introduced into the first transport line 18 through the lignite discharge line 17. By supplying the first transfer air 19 from the blower 21 to the first transfer line 18, the dry lignite 7 is integrated with the first transfer air 19 to the first separation device 22. Be transported.

  At this time, the first transfer air 19 is at a normal temperature, for example, 60 ° C. or less, so as to prevent spontaneous combustion of the dry lignite 7.

  In the first separation device 22, the dry lignite 7 having a large particle size out of the dry lignite 7 is separated from the first transfer air 19, and the dry lignite 7 having a large particle size is separated. The carrier air 19 is supplied to the second separation device 23.

  In the second separation device 23, the fine powder of the dry lignite 7 that could not be separated by the first separation device 22 is separated from the first conveying air 19, and the fine powder of the dry lignite 7 is The separated first transfer air 19 is exhausted to the outside through the exhaust line 24.

  The dried lignite 7 separated from the first transfer air 19 by the first separator 22 and the second separator 23 is fed to the bunker 28 via the rotary valves 25, 26, 27. The dried lignite 7 is stored in the bunker 28.

  A predetermined weight of the dry lignite 7 stored in the bunker 28 is cut out by the meter 31 and fed to the second transport line 29. By supplying the second conveying air 32 (primary air) from the blower 33 to the second conveying line 29, the dry lignite 7 and the second conveying air 32 are mixed, and the coarse powder The mixed stream 47 is fed to the burner 3.

  At this time, the second transfer air 32 is at a normal temperature so as to prevent spontaneous combustion of the dry lignite 7 and has a minimum flow rate that functions as a transfer medium. In this embodiment, the air / coarse coal mass ratio (A / C) of the coarse powder mixed stream 47 is supplied from the blower 33 so as to be a high-concentration coarse powder mixed flow of 0.01 to 0.5. The flow rate of the second transfer air 32 is adjusted, and the amount of the dried lignite 7 cut out from the bunker 28 by the meter 31 is adjusted.

  The secondary combustion air 49 is supplied at a normal temperature when the boiler is started, and the tertiary combustion air 51 to which the secondary combustion air 49 is diverted is also a normal temperature.

  As the combustion air, the secondary combustion air 49 is jetted to the throat 36 through the window box 37 through the main air adjustment mechanism 53 and the auxiliary air adjustment mechanism 52.

  In addition, the secondary combustion air 49 is adjusted in the course of passing through the main air adjustment mechanism 53 and the auxiliary air adjustment mechanism 52 so that the angles of the outer air vane 59 and the inner air vane 61 are adjusted. The strength is adjusted and the air volume is adjusted.

  Further, the tertiary combustion air 51 divided by the tertiary air introduction pipe 48 is ejected from the inner cylinder nozzle 43 toward the throat 36.

  In addition, the high-concentration coarse powder mixed flow 47 is supplied to the fuel conduction space 45, further flows through the fuel conduction space 45 toward the tip, and is ejected from the tip toward the throat 36 in a thin ring shape. The

  As described above, since the flow rate of the second conveying air 32 that conveys the coarse powder mixed flow 47 is small, sufficient combustion air is supplied to burn the coarse powder mixed flow 47. There is a need.

The cross-sectional area of the inner cylinder nozzle 43 is sufficiently larger than the cross-sectional area of the fuel conduction space 45.
Therefore, the tertiary combustion air 51 ejected from the inner cylinder nozzle 43 is supplied to the inside of the coarse powder mixed flow 47 ejected in a ring shape, and the outer periphery of the coarse powder mixed flow 47 The secondary combustion air 49 is supplied from the main air adjustment mechanism 53 and the auxiliary air adjustment mechanism 52. Accordingly, sufficient combustion air is supplied to burn the coarse powder mixed stream 47.

  Here, the flow rate ratio between the secondary combustion air 49 and the tertiary combustion air 51 is exemplified as follows: secondary combustion air flow rate: tertiary combustion air flow rate = 8: 2 to 5: 5. In a conventional burner using pulverized coal obtained by pulverizing high-grade coal such as bituminous coal as a fuel, the ratio of tertiary combustion air is 5% or less at most.

  A flame (plasma) 71 is emitted from the plasma torch 44, and the coarse pulverized coal mixed flow 47 is ignited by the plasma 71.

  Note that the axis of the plasma torch 44 is inclined with respect to the axis of the nozzle body 41 so that the plasma 71 intersects the flow of the coarse powder mixed flow 47. In particular, the tip position and inclination of the plasma torch 44 are set so that the high temperature region of the plasma 71 intersects the coarse powder mixed flow 47.

  In this embodiment, the dry lignite 7 supplied as fuel is coarse powder having a diameter of about 2 mm or less, and the temperature of the combustion air is normal temperature and the temperature of the combustion air of a conventional burner (200 ° C. to 300 ° C. ℃) is low. However, since the dry lignite 7 has a large amount of volatile components, and the plasma torch 44 is used as an ignition source, and the plasma of the plasma torch 44 has a high temperature (the center is 6000 ° C.), the dry lignite Even if the particle size of No. 7 is large and the temperature of the combustion air is normal, ignition is possible and combustion is constantly maintained.

  After the boiler is started, the furnace 2 is heated, and after the temperature of the combustion air rises to a predetermined temperature or higher, for example, 120 ° C. or higher, combustion is caused by the heated combustion air and the radiant heat from the furnace 2. Since it is constantly maintained, the plasma 71 can be extinguished.

  As described above, in the boiler apparatus 1 of the first embodiment, the dry lignite 7 having a high volatile content is used as the fuel, and the high temperature plasma 71 is used as the ignition means. Even with (coarse coal) 7, ignition and combustion can be maintained.

  Therefore, a fine pulverizer such as a vertical roller mill for finely pulverizing the dried lignite 7 is not required, and the pulverizer 11 for coarse pulverization consumes less power than the fine pulverizer. In addition to simplification, the cost can be reduced.

  In the boiler device 1 of the first embodiment, the lignite 6 containing moisture is dried by the drying device 12 and supplied to the burner 3 as the dried lignite 7. Moisture is brought into the furnace and the temperature in the furnace 2 can be prevented from lowering due to the evaporation of the water in the furnace 2, and the boiler efficiency can be improved.

  Further, since the dried lignite 7 dried by the drying device 12 is stored in the bunker 28, and the measuring device 31 adjusts the amount of cut out of the dried lignite 7, the burner 3 is stably roughened. A powder mixture stream 47 can be supplied and combustion of the burner 3 is maintained.

  In addition, since the secondary combustion air 49 and the tertiary combustion air 51 may be at normal temperature when the boiler is started, a mechanism for heating the secondary combustion air 49 and the tertiary combustion air 51 is provided. It becomes unnecessary and the apparatus can be simplified.

  Further, in the burner 3 of the first embodiment, the damper 50 is separated from the tertiary air introduction pipe 48, and the fixation between the inner cylinder nozzle fixing flange 67 and the outer cylinder end plate 66 is released, The inner cylinder nozzle 43 can be pulled out to the reaction furnace 2 side. Further, by releasing the fixing of the base end side flange 65 and the nozzle holder 64, the outer cylinder nozzle 42 can be pulled out to the counter-fire furnace 2 side. Further, the plasma torch 44 can also be pulled out to the reaction furnace 2 side.

  Accordingly, the nozzle body 41 can be assembled, disassembled, and maintained from the outside of the window box 37, and the workability is good.

  Next, a burner 3 according to a second embodiment of the present invention will be described with reference to FIG. 4 that are the same as those in FIG. 3 are given the same reference numerals, and descriptions thereof are omitted.

  In the first embodiment, the plasma torch 44 is provided inside the inner cylinder nozzle 43, but in the second embodiment, the plasma torch 44 is provided outside the nozzle body 41.

  The plasma torch 44 is provided through the wall 63 above the nozzle holder 64 and through the partition wall plate 58. The axis of the plasma torch 44 is inclined so as to approach the axis of the nozzle body 41 toward the tip, and the tip of the plasma torch 44 coincides with or substantially coincides with the tip of the outer cylinder nozzle 42. ing. Furthermore, the tip of the plasma torch 44 is close enough to touch or substantially touch the tip of the outer cylinder nozzle 42.

  The inclination of the plasma torch 44 is set at an angle at which the plasma 71 (particularly in the high temperature region) formed by the plasma torch 44 intersects the coarse powder mixed flow 47 ejected from the fuel conduction space 45.

  Thus, the coarse powder mixed flow 47 ejected from the fuel conduction space 45 is ignited by the plasma torch 44 and burns constantly.

  Also in the second embodiment, the particle size of the dry lignite 7 is as large as about 2 mm or less, and the coarse powder mixed flow 47 can be ignited even when the temperature of the combustion air is normal temperature, and the combustion is steady. Can be maintained.

  In the present invention, the coarse powder mixed flow 47 ejected from the fuel conduction space 45 may be configured so that the high temperature region of the plasma 71 intersects. It may be configured as shown.

  A part of the outer cylinder nozzle 42 and the inner cylinder nozzle 43 are bent toward the center, and a part of the tip of the fuel conduction space 45 is bent toward the center. The plasma torch 44 is provided inside the inner cylinder nozzle 43 in parallel with the inner cylinder nozzle 43 and close to the inner wall surface of the inner cylinder nozzle 43.

  The plasma 71 emitted from the plasma torch 44 is formed in parallel with the axial center of the inner cylinder nozzle 43, but the coarse powder mixed flow 47 is biased toward the center. And the plasma 71 intersect, and the coarse powder mixed flow 47 is ignited and burned. In order to cross the coarse powder mixed flow 47 and the plasma 71 more reliably, the plasma torch 44 may be inclined as in the first embodiment or the second embodiment.

  Further, the fuel conduction space 45 may be bent to the center side, and is not limited to a part.

DESCRIPTION OF SYMBOLS 1 Boiler apparatus 2 Furnace 3 Burner 5 Water content drying system 6 Brown coal (water content) 7 Dry lignite 11 Pulverizer 12 Drying device (drying system)
28 Bunker 31 Weighing device 32 Second transport air (primary air) 33 Blower (transport medium supply means)
39 Secondary air conditioning device 41 Nozzle body 42 Outer cylinder nozzle 43 Inner cylinder nozzle 44 Plasma torch 45 Fuel conduction space 47 Coarse powder mixed flow 49 Secondary combustion air 51 Tertiary combustion air 71 Plasma

Claims (4)

A pulverizer for coarsely pulverizing the hydrated mass into a coarse powder, a drying system for drying the coarse powder and supplying the dried coarse powder, and the coarse powder provided on the furnace wall of the furnace as fuel and plasma as an ignition source comprising a burner having a torch, and a conveying medium supply means for supplying to said burner said coarse powder introduced primary air as a crude powder mixture stream is mixed with the primary air, the burner nozzle body and said A combustion air conditioner provided to surround the tip of the nozzle body, the nozzle body having an inner cylinder nozzle, an outer cylinder nozzle provided concentrically with the inner cylinder nozzle, and the inner cylinder nozzle; The plasma torch is provided in the interior, the axis is inclined with respect to the axis of the inner cylinder nozzle, and the tip is close to the tip of the fuel conduction space, and the inner cylinder nozzle and the outer cylinder nozzle The fuel conducting space is formed between the fuel conducting spaces. The coarse powder mixed flow is supplied to the space, the crude powder mixture stream is ejected from a ring-shaped said fuel flow space, the plasma formed by the plasma torch is configured such that intersects the coarse powder mixed flow Boiler device characterized by. The coarse powder mixed flow uses normal temperature primary air as a carrier medium, and the combustion air conditioner supplies normal temperature secondary combustion air when the boiler is started, and the inner nozzle discharges normal temperature tertiary combustion. The boiler apparatus according to claim 1 , wherein working air is supplied. The outer cylinder nozzle and the inner cylinder nozzle are configured such that at least a part of the front end portion of the fuel conduction space faces the center of the nozzle body, and the plasma formed by the plasma torch is the coarse powder mixed flow. The boiler apparatus of Claim 1 or Claim 2 comprised so that it might cross | intersect. The coarse powder mixed flow is air quantity of carrier medium is any one of claims 1 to 3 is a high density coarse powder mixed stream coarse powder is set so as to suppress the spontaneous ignition during transport The boiler device according to Item 1.

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