JP2005300064A - Soot blower device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soot blower device that can stabilize furnace operation by increasing the cooling efficiency of an outer tube and preventing thermal damage or bending thereof without increasing the supply of a spray medium such as steam or air. <P>SOLUTION: On an inner surface of the outer tube 28, a fin 42 is helically projected as cooling means for the outer tube 28. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a soot blower device used in a boiler or the like.

  FIG. 9 shows an example of a boiler. In FIG. 9, reference numeral 1 denotes a boiler body having a furnace 1a and a rear heat transfer section 1b, and 2 denotes a fuel injected into the furnace 1a of the boiler body 1 for combustion. Burner, 3 is the primary superheater, 4 is the secondary superheater, 5 is the tertiary superheater, 6 is the final superheater, 7 is the primary reheater, 8 is the secondary reheater, 9 is the economizer, By injecting fuel from the burner 2 into the furnace 1a of the boiler body 1 and burning it, combustion gas is generated, the generated combustion gas is circulated, the secondary superheater 4, the tertiary superheater 5, and the final superheater. 6. Heat exchange with the secondary reheater 8, the primary superheater 3, the primary reheater 7, and the economizer 9, the exhaust gas after the heat exchange is discharged to the exhaust gas duct 10, and denitration provided downstream After removing nitrogen oxides and sulfur oxides with a flue gas treatment device (not shown) such as desulfurization, it will be released to the atmosphere It has become.

  On the other hand, FIG. 10 shows the above-described boiler feed water / steam system. The boiler feed water is heated by the evaporator 11 formed on the furnace wall of the furnace 1a of the boiler body 1 where the fuel is burned, and the nose portion. 12, the steam separated into water and steam by the brackish water separator 13, and the steam separated from the water by the brackish water separator 13 pass through the ceiling of the boiler body 1 and the peripheral wall 14 of the rear heat transfer section, and the primary superheater 3. The secondary superheater 4, the tertiary superheater 5, and the final superheater 6 are superheated and guided to the high-pressure turbine 15, and the high-pressure turbine 15 is driven to generate power, and after the high-pressure turbine 15 is driven The steam is guided to the primary reheater 7 and the secondary reheater 8, reheated by the primary reheater 7 and the secondary reheater 8, and then introduced into the medium / low pressure turbine 16. -The low-pressure turbine 16 is driven to generate power, and the medium / low pressure The steam after driving the bin 16 is guided to the condenser 17 and returned to the boiler feed water. The boiler feed water passes through the condensate demineralizer 18, the low-pressure feed water heater 19, and the deaerator 20. The feed pump 21 is pumped to the economizer 9 via the high-pressure feed water heater 22, heated by the economizer 9, fed to the evaporator 11, and circulated.

  By the way, in the case of a coal fired boiler, ash is generated with the combustion of coal as fuel, and the inner wall of the furnace 1a, the primary superheater 3, the secondary superheater 4, the tertiary superheater 5, and the final superheater. 6. Adhere to various heat transfer tube surfaces such as primary reheater 7, secondary reheater 8, economizer 9, etc. When ash adheres to the furnace wall inner surface and various heat transfer tube surfaces of furnace 1a, Since the heat recovery in the boiler body 1 is reduced, a soot blower 23 as shown in FIG. 11 is disposed at a place outside the furnace in the furnace 1a and the rear heat transfer section 1b of the boiler body 1, and the soot blower 23 By inserting an outer tube 28, which will be described later, into the furnace, a spray medium 24 such as steam or air is sprayed on the furnace wall inner surface of the furnace 1a and various heat transfer tube surfaces, and the attached ash is blown away and removed. .

  In the soot blower 23, for example, as shown in FIG. 11, an inner tube 26 to which a spray medium 24 such as steam or air is supplied via a valve 25 is fixedly disposed at a required location outside the furnace of the boiler body 1. An outer tube 28 in which an injection hole 27 for injecting the spray medium 24 in a direction perpendicular to the axial direction is formed at the distal end of the fixed inner tube 26 is disposed concentrically so as to be extendable and turnable. In addition, a drive system for inserting the outer tube 28 into the furnace is provided.

  A carriage (not shown) that is slidable while maintaining airtightness with respect to the outer peripheral surface of the inner tube 26 is attached to the base end of the outer tube 28.

  As shown in FIGS. 11 and 12, the drive system for the outer tube 28 includes a guide rail 29 and a rack 30 that extend in parallel to the axial direction of the outer tube 28, and the trolley bracket 31 is attached to the guide rail 29. The outer tube 28 is attached to the trolley bracket 31 so as to be rotatable about its axis, and a pinion 32 that meshes with the rack 30 is provided in the trolley bracket 31, and the outer tube 28 is driven for turning. The sprocket 33 is externally fitted and the drive motor 34 is rotationally driven to rotate the pinion 32 via the telescopic drive sprocket 35, the telescopic chain 36, the telescopic driven sprocket 37, the worm 38, and the worm wheel 39. , Turning drive sprocket 40 and turning chain By rotating the turning driven sprocket 33 through one and, are so as to pivot while advance and return the outer tube 28.

As an example of a soot blower device having a structure as shown in FIGS. 11 and 12, there is Patent Document 1, for example.
JP 2002-310422 A

  However, in the conventional soot blower 23 as described above, the outer tube 28 exposed to a high temperature in the furnace of the boiler body 1 may be damaged by heat and may be bent. In some cases, the operation of the furnace is stopped. There was something I had to do.

  In order to protect the outer tube 28 from heat, it is effective to increase the supply amount of the spray medium 24 such as steam or air, and in order to increase the supply amount of the spray medium 24, a method of increasing the pressure thereof. Alternatively, there is a method of increasing the diameter or increasing the number of the injection holes 27. However, when the pressure of the spray medium 24 is increased, the impact force on the furnace wall and various heat transfer tubes to which the soot is dropped increases. In the case of either the method of increasing the pressure of the spray medium 24 or the method of increasing the diameter or increasing the number of the injection holes 27, the amount of the spray medium 24 such as steam used is increased. It has the disadvantage of increasing the efficiency of the entire plant, and none of the countermeasures are very favorable.

  In addition, in the case of the soot blower device disclosed in Patent Document 1, it is possible to prevent the occurrence of thermal shock at the distal end portion of the outer tube 28, but there is no damage or bending due to heat at a portion other than the distal end portion of the outer tube 28. It has not been taken into account, and it has been difficult to prevent damage or bending due to heat.

  In view of such circumstances, the present invention can increase the cooling efficiency of the outer tube without increasing the supply amount of the spray medium such as steam or air, and can prevent damage or bending due to heat, thereby stabilizing the operation of the furnace. Thus, the present invention intends to provide a soot blower device that can be performed.

The present invention is a soot blower device that is arranged concentrically so as to be stretchable with respect to a fixed inner tube to which a spray medium is supplied, and sprays the spray medium from an outer tube tip inserted into a furnace.
The present invention relates to a soot blower device characterized in that a cooling means is provided on the inner surface of the outer tube.

  According to the above means, the following operation can be obtained.

  As described above, if the cooling means is provided on the inner surface of the outer tube, the cooling efficiency of the outer tube can be enhanced and the damage or bending due to heat can be prevented without increasing the supply amount of the spray medium such as steam or air. This makes it possible to operate the furnace stably.

  In the soot blower device, the cooling means can be a fin that protrudes in a spiral manner on the inner surface of the outer tube, and in this way, the heat transfer area on the inner surface of the outer tube is increased by the helical fin. In addition, the flow of the boundary layer along the inner surface of the outer tube of the spray medium becomes a turbulent flow, the amount of heat exchange between the outer tube and the spray medium is increased, and the metal temperature of the outer tube can be lowered. The helical fin also serves as a reinforcing material against the bending of the outer tube.

  Further, in the soot blower device, the cooling means may be a fin projecting on the inner surface of the outer tube so as to extend in the axial direction thereof. In this case, the fin extending in the axial direction of the outer tube is used to As the heat transfer area increases and the outer tube turns, the flow in the boundary layer along the inner surface of the outer tube of the spray medium is agitated and becomes turbulent, increasing the amount of heat exchange between the outer tube and the spray medium. While the metal temperature of the outer tube can be lowered, the fins extending in the axial direction of the outer tube also serve as a reinforcing material against the deflection of the outer tube.

  Furthermore, in the soot blower device, the cooling means can be a groove that is recessed so as to extend spirally on the inner surface of the outer tube, and in this way, the heat transfer area on the inner surface of the outer tube is formed by the spiral groove. As the flow rate increases, the flow of the boundary layer along the inner surface of the outer tube of the spray medium becomes turbulent, the amount of heat exchange between the outer tube and the spray medium increases, and the metal temperature of the outer tube can be lowered. .

  In the soot blower device, the cooling means may be a groove that is recessed in the outer tube inner surface so as to extend in the axial direction. In this case, the groove in the outer tube inner surface is formed by the groove extending in the axial direction of the outer tube. As the heat transfer area increases and the outer tube turns, the flow in the boundary layer along the inner surface of the outer tube of the spray medium is agitated and becomes turbulent, increasing the amount of heat exchange between the outer tube and the spray medium. The metal temperature of the outer tube can be lowered.

  According to the soot blower device of the first to fifth aspects of the present invention, it is possible to increase the cooling efficiency of the outer tube without increasing the supply amount of the spray medium such as steam or air and prevent damage or bending due to heat. An excellent effect that the operation of the furnace can be performed stably can be obtained.

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

  1 and 2 show a first embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 11 and 12 denote the same components, and the basic configuration is shown in FIG. 11 and 12 is the same as the conventional one shown in FIG. 11 and FIG. 12, but the feature of this illustrated example is that fins as cooling means for the outer tube 28 are provided on the inner surface of the outer tube 28 as shown in FIGS. It is in the point which protruded so that 42 might extend spirally.

  Next, the operation of the illustrated example will be described.

  As described above, when the fin 42 as a cooling means for the outer tube 28 is provided on the inner surface of the outer tube 28 so as to extend spirally, the heat transfer area on the inner surface of the outer tube 28 is increased by the helical fin 42. At the same time, the flow of the boundary layer along the inner surface of the outer tube 28 of the spray medium 24 becomes turbulent, the amount of heat exchange between the outer tube 28 and the spray medium 24 increases, and the metal temperature of the outer tube 28 can be lowered. On the other hand, the helical fin 42 also plays a role of a reinforcing material against the bending of the outer tube 28.

  As a result, it is possible to increase the cooling efficiency of the outer tube 28 by the spiral fins 42 and prevent damage and bending due to heat without increasing the supply amount of the spray medium 24 such as steam or air. The furnace can be operated stably.

  Thus, the cooling efficiency of the outer tube 28 can be increased without increasing the supply amount of the spray medium 24 such as steam or air, and damage and bending due to heat can be prevented, and the operation of the furnace can be performed stably.

  3 and 4 show a second example of the embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 and 2 denote the same parts, and the inner surface of the outer tube 28 Fins 43 as cooling means for the outer tube 28 are provided so as to extend in the axial direction of the outer tube 28.

  In the example of FIG. 4, the fins 43 are arranged at four places so as to be equally spaced in the circumferential direction of the outer tube 28, but may be arranged at two places, three places, or four places or more. Needless to say.

  As described above, when the fin 43 as a cooling means of the outer tube 28 is provided on the inner surface of the outer tube 28 so as to extend in the axial direction of the outer tube 28, the fin 43 extending in the axial direction of the outer tube 28 As the heat transfer area on the inner surface of the tube 28 increases and the outer tube 28 swirls, the flow of the boundary layer along the inner surface of the outer tube 28 of the spray medium 24 is agitated and becomes turbulent, and the outer tube 28 and the spray medium 24 The amount of heat exchange with the outer tube 28 can be increased, and the metal temperature of the outer tube 28 can be lowered. On the other hand, the fin 43 extending in the axial direction of the outer tube 28 also serves as a reinforcing material against the deflection of the outer tube 28. It will be.

  As a result, the cooling efficiency of the outer tube 28 is enhanced by the fins 43 extending in the axial direction of the outer tube 28 without increasing the supply amount of the spray medium 24 such as steam or air, thereby preventing damage and bending due to heat. It becomes possible to operate the furnace stably.

  Thus, in the example shown in FIGS. 3 and 4 as well, it is possible to increase the cooling efficiency of the outer tube 28 without increasing the supply amount of the spray medium 24 such as steam or air, thereby preventing damage and bending due to heat. The furnace can be operated stably.

  5 and 6 show a third example of the embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 and 2 denote the same parts, and the inner surface of the outer tube 28 A groove 44 as a cooling means for the outer tube 28 is recessed so as to extend spirally.

  As described above, when the groove 44 serving as a cooling means for the outer tube 28 is formed to extend spirally on the inner surface of the outer tube 28, the heat transfer area on the inner surface of the outer tube 28 is increased by the spiral groove 44. At the same time, the flow of the boundary layer along the inner surface of the outer tube 28 of the spray medium 24 becomes turbulent, the amount of heat exchange between the outer tube 28 and the spray medium 24 increases, and the metal temperature of the outer tube 28 can be lowered. It becomes.

  As a result, it is possible to increase the cooling efficiency of the outer tube 28 by the spiral groove 44 and prevent damage or bending due to heat without increasing the supply amount of the spray medium 24 such as steam or air. The furnace can be operated stably.

  Thus, also in the example shown in FIGS. 5 and 6, the cooling efficiency of the outer tube 28 can be improved without increasing the supply amount of the spray medium 24 such as steam or air, thereby preventing damage or bending due to heat. The furnace can be operated stably.

  7 and 8 show a fourth example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 3 and 4 denote the same parts, and the inner surface of the outer tube 28 is A groove 45 as a cooling means for the outer tube 28 is recessed so as to extend in the axial direction of the outer tube 28.

  In addition, although the said groove | channel 45 is arrange | positioned in four places so that it may become equal intervals in the circumferential direction of the outer tube 28 in the example of FIG. 8, you may arrange | position in two places, three places, or four places or more. Needless to say.

  As described above, when the groove 45 serving as a cooling means for the outer tube 28 is formed on the inner surface of the outer tube 28 so as to extend in the axial direction of the outer tube 28, the outer tube 28 extends by the groove 45 extending in the axial direction. As the heat transfer area on the inner surface of the tube 28 increases and the outer tube 28 swirls, the flow of the boundary layer along the inner surface of the outer tube 28 of the spray medium 24 is agitated and becomes turbulent, and the outer tube 28 and the spray medium 24 The amount of heat exchange with the outer tube 28 increases, and the metal temperature of the outer tube 28 can be lowered.

  As a result, the cooling efficiency of the outer tube 28 is enhanced by the groove 45 extending in the axial direction of the outer tube 28 without increasing the supply amount of the spray medium 24 such as steam or air, thereby preventing damage and bending due to heat. It becomes possible to operate the furnace stably.

  Thus, in the case of the example shown in FIGS. 7 and 8, the cooling efficiency of the outer tube 28 can be improved without increasing the supply amount of the spray medium 24 such as steam or air, thereby preventing damage or bending due to heat. The furnace can be operated stably.

  Note that the soot blower device of the present invention is not limited to the above-described illustrated example, and can also be applied to an outer tube 28 that does not necessarily rotate but expands and contracts with respect to the inner tube 26 and is inserted into the furnace. Of course, various modifications can be made without departing from the scope of the present invention.

It is a sectional side view of the 1st example of the form which carries out the present invention. It is II-II sectional drawing of FIG. It is a sectional side view of the 2nd example of the form which carries out the present invention. It is IV-IV sectional drawing of FIG. It is a sectional side view of the 3rd example of the form which carries out the present invention. It is VI-VI sectional drawing of FIG. It is a sectional side view of the 4th example of an embodiment which carries out the present invention. It is VIII-VIII sectional drawing of FIG. It is a whole outline block diagram which shows an example of a common boiler. It is a schematic block diagram which shows the feed water / steam system | strain of the boiler shown by FIG. It is a sectional side view which shows an example of a soot blower. It is a schematic perspective view which shows the drive system in an example of a soot blower.

Explanation of symbols

23 Soot blower 24 Spray medium 26 Inner tube 27 Injection hole 28 Outer tube 42 Fin (cooling means)
43 Fins (cooling means)
44 groove (cooling means)
45 groove (cooling means)

Claims (5)

In the soot blower device that is arranged concentrically so as to be stretchable with respect to the fixed inner tube to which the spray medium is supplied and sprays the spray medium from the tip of the outer tube inserted into the furnace,
A soot blower device characterized in that a cooling means is provided on the inner surface of the outer tube.   The soot blower device according to claim 1, wherein the cooling means is a fin projecting so as to extend spirally on the inner surface of the outer tube.   2. The soot blower device according to claim 1, wherein the cooling means is a fin projecting on the inner surface of the outer tube so as to extend in the axial direction thereof.   The soot blower device according to claim 1, wherein the cooling means is a groove that is recessed to extend spirally on the inner surface of the outer tube.   The soot blower device according to claim 1, wherein the cooling means is a groove recessed in the inner tube inner surface so as to extend in the axial direction thereof.

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