JP2014234986A - Desuperheater and desuperheater spray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately decrease the temperature of superheated steam.SOLUTION: A desuperheater comprises: a water tube 21 at which a spray nozzle is formed; an outer cylinder 22 covering the water tube 21; and a baffle 29-1. Such a desuperheater flows warming steam to a warming steam channel 26 formed between the water tube 21 and the outer cylinder 22, and injects the warming steam and mist sprayed from the spray nozzle from a hole 27-1 formed in the outer cylinder 22 to superheated steam. The baffle 29-1 is arranged upstream of the hole 27-1 in the warming steam channel 26. Such a desuperheater can decrease offset of a direction in which the mist is injected by the warming steam by disturbing the warming steam by the baffle 29-1, spray the mist in an appropriate direction, and appropriately decrease the temperature of the steam.

Description

  The present invention relates to a temperature reducer and a spray tube for a temperature reducer, and more particularly, to a temperature reducer and a spray tube for a temperature reducer that are used when reducing the temperature of superheated steam.

  A temperature reducer that reduces the temperature of superheated steam is known. The temperature reducer is provided with a spray nozzle protective cylinder in which a spray water spray window having the same central axis is formed on the outer periphery of the spray nozzle. The temperature reducer cools and depressurizes the steam by spraying water onto the steam from a spray nozzle. The desuperheater allows the spray nozzle cooling steam to flow between the spray nozzle and the spray nozzle protection cylinder so that high temperature steam does not directly touch the spray nozzle, and the thermal stress caused by intermittent injection of spray water is prevented. Reduction is aimed at (refer patent document 1).

Japanese Patent Laying-Open No. 2005-201610

  Such a temperature reducer is desired to appropriately reduce the temperature of the superheated steam, and is desired to appropriately spray mist for reducing the temperature of the steam.

  An object of the present invention is to provide a temperature reducer and a temperature reducer spray pipe that appropriately reduce the temperature of superheated steam.

  The temperature reducer according to the present invention includes an outer cylinder disposed in a steam channel through which steam flows, a water pipe that forms a spray water channel through which spray water flows, and a baffle plate. At this time, the water pipe is disposed inside the outer cylinder so that a warming steam flow path through which the warming steam flows is formed between the water pipe and the outer cylinder, and is formed from the spray water. A spray nozzle for injecting mist is formed. The outer cylinder is formed with a hole through which the warming vapor and the mist ejected from the spray nozzle pass through the vapor flow path. The baffle plate is disposed upstream of the hole in the warming steam channel.

  In such a desuperheater, the flow of warming steam flowing through the warming steam channel is disturbed by the baffle plate, so that the mist is injected as compared with other desuperheaters not equipped with the baffle plate. It is possible to reduce the direction in which the heat is generated by the warming steam, and to spray the mist in an appropriate direction, and to appropriately reduce the temperature of the steam.

  The baffle plate is fixed to the water pipe. Such a desuperheater can be more easily manufactured than the other desuperheater in which the baffle plate is fixed to the outer cylinder, and can be more easily inserted into the outer cylinder. it can.

  The outer cylinder is further formed with a protrusion protruding from the periphery of the hole toward the water pipe. Such a temperature reducer injects warming steam so that a plurality of injection amounts respectively ejected from a plurality of regions around the hole are more uniform by forming such protrusions. can do. For this reason, such a temperature reducer can prevent the droplets of the spray water from adhering to the outer cylinder, and can prevent the outer cylinder from being damaged due to a temperature change caused by the droplets. .

  The desuperheater according to the present invention provides a warming steam flow path for separating the warming steam separated from the pre-reheat steam when the steam is generated by heating the pre-reheat steam in the reheater. A warming steam supply pipe is further provided.

  Such a desuperheater can be made more easily than other desuperheaters that generate warming steam from other than the preheated steam.

  A spray pipe for a temperature reducer according to the present invention includes an outer cylinder disposed in a steam flow path through which steam flows, a water pipe that forms a spray water flow path through which spray water flows, and a baffle plate. At this time, the water pipe is disposed inside the outer cylinder so that a warming steam flow path through which the warming steam flows is formed between the water pipe and the outer cylinder, and sprays the spray water. A spray nozzle is formed. The outer cylinder is formed with a hole through which the warming vapor and the mist injected from the spray nozzle pass. The baffle plate is disposed upstream of the hole in the warming steam channel.

  Such a spray tube for a desuperheater has a flow of warming steam in the vicinity of its hole in the warming steam channel, disturbed by the baffle plate, and other depressor spray tubes not provided with the baffle plate. In comparison, the warming steam can be injected so that the plurality of injection amounts respectively ejected from the plurality of regions around the hole are more uniform. For this reason, such a spray tube for a temperature reducer can prevent the mist from adhering to the outer cylinder, and can prevent the outer cylinder from being damaged by a temperature change caused by the mist.

  The temperature reducing device and the temperature reducing device spray pipe according to the present invention can spray the mist for cooling the vapor in an appropriate direction, and can appropriately cool the vapor.

It is a schematic block diagram which shows the turbine installation to which the temperature reducer was applied. It is a longitudinal cross-sectional view which shows an inner tube | pipe and the spray tube for temperature reducers. It is a cross-sectional view which shows an inner tube | pipe and a spray tube for temperature reducers. It is a longitudinal cross-sectional view which shows a water pipe, an outer cylinder, and a baffle plate. It is a cross-sectional view which shows a water pipe, an outer cylinder, and a baffle plate.

  With reference to the drawings, an embodiment of a warmer is described below. The temperature reducer 1 is used in a steam turbine facility 10 as shown in FIG. The steam turbine facility 10 includes a temperature reducer 1, and includes a high pressure turbine 2, a steam pipe 3, a primary reheater 5, a communication pipe 6, a secondary reheater 7, and a low pressure turbine 8. The high-pressure turbine 2 generates rotational power using kinetic energy of high-temperature and high-pressure steam supplied from the outside, and exhausts waste steam. The steam pipe 3 forms a waste steam flow path that connects the high pressure turbine 2 and the primary reheater 5, and supplies waste steam exhausted from the high pressure turbine 2 to the primary reheater 5.

  The primary reheater 5 generates primary reheat steam from waste steam supplied from the steam pipe 3. The connecting pipe 6 forms a steam flow path 11 that connects the primary reheater 5 and the secondary reheater 7, and the primary reheat steam generated by the primary reheater 5 is supplied to the secondary reheater 7. Supply. The secondary reheater 7 generates secondary reheat steam from the primary reheat steam supplied from the communication pipe 6. The low-pressure turbine 8 generates rotational power using the kinetic energy of the secondary reheat steam generated by the secondary reheater 7.

  The temperature reducer 1 includes a spray water supply pipe 14, a warming steam supply pipe 15, a temperature reducer spray pipe 16, and an inner pipe 17. The spray water supply pipe 14 forms a spray water flow path, and supplies spray water supplied from an external water supply device 18 to the spray pipe 16 for the temperature reducer. The warming steam supply pipe 15 forms a warming steam channel branched from the waste steam channel formed by the steam pipe 3, and reduces the temperature of the warming steam generated from the waste steam exhausted from the high-pressure turbine 2. Supply to the instrument spray tube 16.

  As shown in FIG. 2, the spray tube 16 for the temperature reducer is formed in a bar shape thinner than the communication tube 6. A part of the temperature reducing spray tube 16 is arranged in the steam flow path 11 so that the temperature reducing spray tube 16 intersects the connecting tube 6 perpendicularly. The inner pipe 17 is disposed in a region downstream of the spray pipe 16 for the temperature reducer in the steam channel 11. As shown in FIG. 3, the inner tube 17 is formed in a cylindrical shape, and is disposed in the steam channel 11 so that the longitudinal direction of the steam channel 11 and the axial direction of the inner tube 17 are parallel to each other. .

  As shown in FIG. 4, the temperature reducing spray tube 16 includes a water tube 21 and an outer cylinder 22. The water pipe 21 is formed as a straight pipe, and a spray water flow path 24 is formed inside the pipe. The spray water channel 24 is connected to a spray water channel formed by the spray water supply pipe 14. The water pipe 21 includes a plurality of spray nozzles 25-1 to 25-2. Arbitrary spray nozzles 25-i (i = 1, 2) of the plurality of spray nozzles 25-1 to 25-2 are arranged so as to face the inner tube 17.

  The outer cylinder 22 is formed in a cylindrical shape and is disposed so as to cover the water pipe 21. The outer cylinder 22 forms a warming steam channel 26 between the outer cylinder 22 and the water pipe 21. The warming steam channel 26 is connected to a warming steam channel formed by the warming steam supply pipe 15.

  The outer cylinder 22 has a plurality of holes 27-1 to 27-2 and a plurality of protrusions 28-1 to 28-2. The plurality of holes 27-1 to 27-2 correspond to the plurality of spray nozzles 25-1 to 25-2. A hole 27-i corresponding to the spray nozzle 25-i among the plurality of holes 27-1 to 27-2 is formed in a region of the outer cylinder 22 facing the spray nozzle 25-i. The plurality of protrusions 28-1 to 28-2 correspond to the plurality of holes 27-1 to 27-2. The protrusion 28-i corresponding to the hole 27-i among the plurality of protrusions 28-1 to 28-2 is formed at the flange of the hole 27-i and protrudes from the flange of the hole 27-i toward the water pipe 21. Yes.

  The temperature reducing device spray tube 16 further includes a plurality of baffle plates 29-1 to 29-2. The plurality of baffle plates 29-1 to 29-2 correspond to the plurality of holes 27-1 to 27-2. The baffle plate 29-i corresponding to the hole 27-i among the plurality of baffle plates 29-1 to 29-2 is formed in a flat plate shape. The baffle plate 29-i is disposed in a region upstream of the hole 27-i in the warming steam channel 26, and is disposed along a plane perpendicular to the longitudinal direction of the warming steam channel 26. Yes. Further, the baffle plate 29-i is joined to the water pipe 21 as shown in FIG. 5.

  The temperature reducer 1 is used when the steam turbine facility 10 is operating. When the temperature reducer 1 is operating, the high-pressure turbine 2 of the steam turbine facility 10 generates rotational power using the kinetic energy of high-temperature and high-pressure steam supplied from the outside, and exhausts waste steam. . The steam pipe 3 supplies the waste steam to the primary reheater 5. The primary reheater 5 generates primary reheat steam by heating the waste steam. The communication pipe 6 supplies the primary reheat steam to the secondary reheater 7. The secondary reheater 7 generates secondary reheat steam by heating the primary reheat steam. The low-pressure turbine 8 generates rotational power using the kinetic energy of the secondary reheat steam.

  The warming steam supply pipe 15 generates warming steam by separating a part of the waste steam exhausted from the high-pressure turbine 2, and the warming steam is supplied to the warming steam flow path of the spray pipe 16 for the temperature reducer. 26. When the warming steam is supplied to the warming steam channel 26, the spray pipe 16 for the temperature reducer sprays the steam channel 11 from the plurality of holes 27-1 to 27-2.

  When the temperature of the primary reheat steam generated by the primary reheater 5 is higher than a predetermined temperature, the temperature reducer 1 sprays from the water supply device 18 via the spray water supply pipe 14 to the spray pipe 16 for the temperature reducer. Spray water is supplied to the water channel 24. The plurality of spray nozzles 25-1 to 25-2 generate mist from the spray water when the spray water is supplied to the spray water flow path 24, and spray the mist.

  The mist is sprayed from the plurality of spray nozzles 25-1 to 25-2, passes through the plurality of holes 27-1 to 27-2 of the outer cylinder 22, and is supplied to the steam flow path 11. When the mist is supplied to the steam channel 11, the mist comes into contact with the primary reheated steam flowing through the steam channel 11 and vaporizes, thereby cooling the primary reheated steam.

  The mist may cool the connecting pipe 6 by repeatedly contacting the inner wall of the connecting pipe 6 before being vaporized, and may repeatedly apply thermal stress. The inner pipe 17 is arranged in a region of the steam flow path 11 on the downstream side of the spray pipe 16 for the temperature reducer, so that a part of the mist that is not vaporized on the inner wall of the connecting pipe 6. This prevents contact and prevents thermal stress from being repeatedly applied to the inner tube 17. By preventing the thermal stress from being repeatedly applied, the connecting pipe 6 is prevented from being damaged and the life thereof is extended.

  When the water pipe 21 is in direct contact with the primary reheated steam flowing through the steam flow path 11, the temperature difference between the temperature of the inner surface of the water pipe 21 and the temperature of the outer surface of the water pipe 21 is large, thereby causing thermal stress. Is repeatedly applied. The outer cylinder 22 is disposed so as to cover the water pipe 21, thereby preventing the water pipe 21 from coming into direct contact with the primary reheat steam. Further, the outer cylinder 22 can form a warming steam channel 26 so that warming steam having a temperature lower than that of the primary reheat steam can be always brought into contact with the outer surface of the water pipe 21. The temperature difference between the temperature of the inner surface and the temperature of the outer surface of the water pipe 21 can be reduced. For this reason, the outer cylinder 22 can prevent thermal stress from being repeatedly applied to the water tube 21. By preventing the thermal stress from being repeatedly applied, the water tube 21 is prevented from being damaged and the life is extended.

  Since the baffle plate 29-1 is arranged in the warming steam channel 26, the warming steam is blocked by the baffle plate 29-1 when flowing through the warming steam channel 26. The warming vapor flows along the flow 31-1 that bypasses the baffle plate 29-1, as shown in FIG. Flows relatively uniformly from the periphery of the hole 27-1. The mist sprayed from the spray nozzle 25-1 generally flows in the longitudinal direction of the spray tube 16 for the desuperheater when the warming vapor flows relatively uniformly from the periphery of the hole 27-1 into the hole 27-1. It is jetted appropriately in the direction that is vertical.

  The warming steam flows along the flow 31-2 that bypasses the baffle plate 29-2 due to the baffle plate 29-2 being arranged in the warming steam flow path 26, and around the hole 27-2. Into the hole 27-2 relatively uniformly. The mist sprayed from the spray nozzle 25-2 has its warming vapor flowing relatively uniformly from the periphery of the hole 27-2 into the hole 27-2. It is jetted appropriately in the direction that is vertical.

  The primary reheated steam flowing through the steam flow path 11 is appropriately cooled and appropriately depressurized by appropriately ejecting mist from the plurality of spray nozzles 25-1 to 25-2.

  In the comparative example of the temperature reducer, the plurality of baffle plates 29-1 to 29-2 are omitted. In the temperature reducer of the comparative example, the warming steam flows along the flow 131-1 passing through the hole 27-1, and the upstream side of the periphery of the hole 27-1 as shown in FIG. Often flows into the hole 27-1. The mist sprayed from the spray nozzle 25-1 is jetted to the downstream side of the warming steam flow path 26 as the warming steam flows from the periphery of the hole 27-1 and flows into the hole 27-1. . The primary reheated steam flowing through the steam flow path 11 may not be appropriately reduced in temperature due to the mist being jetted away. Further, the mist may adhere to the outer cylinder 22 before being vaporized by the jetting of warming steam that is offset. The outer cylinder 22 may be repeatedly cooled by applying mist that has not been vaporized, and thermal stress may be repeatedly applied. The outer cylinder 22 may be damaged by repeated application of thermal stress.

  The temperature reducer 1 has a plurality of baffle plates 29-1 to 29-2 arranged in the warming steam flow path 26, so that mist is more appropriately injected as compared with the temperature reducer of the comparative example. The primary reheat steam flowing through the steam flow path 11 can be more appropriately reduced in temperature. The temperature reducer 1 prevents thermal stress from being repeatedly applied to the outer cylinder 22 by appropriately injecting mist. The outer cylinder 22 is prevented from being repeatedly applied with the thermal stress, thereby being prevented from being damaged and extending its life.

  Since the protrusion 28-i is formed on the outer cylinder 22, the temperature reducer 1 applies resistance to the flow of the warming steam when the warming steam flows into the hole 27-i. The resistance increases as the flow of warming steam increases. For this reason, in the temperature reducer 1, warming steam flows more uniformly from the periphery of the hole 27-i into the hole 27-i than the other temperature reducers in which the protrusions 28-i are not formed. The warmer 1 can appropriately inject mist from the spray nozzle 25-i by allowing warming vapor to uniformly flow from the periphery of the hole 27-i into the hole 27-i. The temperature reducer 1 can appropriately reduce the temperature of the primary reheat steam flowing through the steam flow path 11 by appropriately injecting mist.

  The plurality of baffle plates 29-1 to 29-2 can be replaced with other plurality of baffle plates formed from bent plates. The temperature reducer including the plurality of baffle plates also has an appropriate direction for the mist for cooling the steam superheated by the primary reheater 5 in the same manner as the temperature reducer 1 in the above-described embodiment. And the vapor can be cooled appropriately.

  The plurality of baffle plates 29-1 to 29-2 further includes one mist when each mist can be appropriately ejected from all of the plurality of spray nozzles 25-1 to 25-2 by one baffle plate. Can be replaced with baffle plates. The temperature reducer provided with one baffle plate can also cool the vapor | steam appropriately similarly to the temperature reducer 1 in embodiment mentioned above.

  The spray tube 16 for the temperature reducer is easily manufactured by inserting the water tube 21 into the outer cylinder 22 after the baffle plates 29-1 to 29-2 are joined to the water tube 21. The spray tube 16 for the temperature reducer is a case where the water tube 21 is inserted into the outer cylinder 22 after the plurality of baffle plates 29-1 to 29-2 are joined to the outer cylinder 22, and a plurality of spray nozzles 25-1 to 25-. When 2 is formed so as to protrude from the cylindrical surface along which the outer side of the water pipe 21 extends, the plurality of spray nozzles 25-1 to 25-2 may be caught by the plurality of baffle plates 29-1 to 29-2. . The spray tube 16 for the temperature reducer has a plurality of baffle plates 29-1 to 29-2 joined to the water tube 21, so that the plurality of spray nozzles 25-1 to 25-2 are from the cylindrical surface along which the outside of the water tube 21 extends. Even when formed so as to protrude, the plurality of spray nozzles 25-1 to 25-2 can be easily inserted without being caught by the plurality of baffle plates 29-1 to 29-2. The spray tube 16 for the temperature reducer can be more easily manufactured by the water tube 21 being easily inserted into the outer cylinder 22.

  The plurality of baffle plates 29-1 to 29-2 are a plurality of other baffles that are joined to the outer cylinder 22 when the plurality of spray nozzles 25-1 to 25-2 do not protrude from the side surface of the water pipe 21. Can be replaced with a board. Such a temperature reducer including a plurality of baffle plates, in the same manner as the temperature reducer 1 in the above-described embodiment, provides an appropriate direction for the mist for cooling the steam superheated by the primary reheater 5. And the vapor can be cooled appropriately.

  The outer cylinder 22 is formed with a plurality of projections 28-1 to 28-2 when the plurality of baffle plates 29-1 to 29-2 can inject the warming steam so as not to be sufficiently offset. It can be replaced with other outer cylinders. The temperature reducer provided with such an outer cylinder, in the same manner as the temperature reducer 1 in the above-described embodiment, directs mist for cooling the steam superheated by the primary reheater 5 in an appropriate direction. It can be sprayed and the vapor can be cooled appropriately.

  The plurality of spray nozzles 25-1 to 25-2 are replaced with one spray nozzle when the temperature of the superheated steam can be sufficiently reduced by the mist ejected from one spray nozzle. Can. At this time, the plurality of holes 27-1 to 27-2 formed in the outer cylinder 22 are replaced with one hole formed in a region where the one spray nozzle faces. The temperature reducer including one spray nozzle also sprays mist for cooling the steam superheated by the primary reheater 5 in an appropriate direction in the same manner as the temperature reducer 1 in the above-described embodiment. And the steam can be cooled appropriately.

  Note that the warming steam supply pipe 15 can be replaced with another warming steam supply pipe that supplies other steam different from the waste steam exhausted from the high-pressure turbine 2 as warming steam. As the steam, steam generated by a boiler provided separately from the steam turbine facility 10 is exemplified. The temperature reducer provided with such a warming steam supply pipe is also appropriately equipped with a mist for cooling the steam superheated by the primary reheater 5 in the same manner as the temperature reducer 1 in the above-described embodiment. Can be sprayed in any direction, and the vapor can be properly cooled. Further, the temperature reducer 1 in the above-described embodiment does not require a device for generating the warming steam separately from the waste steam, and is manufactured more easily than such a temperature reducer. be able to.

DESCRIPTION OF SYMBOLS 10: Steam turbine equipment 1: Temperature reducer 3: Steam pipe 5: Primary reheater 6: Communication pipe 11: Steam flow path 15: Warming steam supply pipe 17: Spray pipe for temperature reducer 21: Water pipe 22: Outer cylinder 24: Spray water flow path 25-1 to 25-2: Spray nozzle 26: Warming steam flow path 27-1 to 27-2: Hole 28-1 to 28-2: Protrusion 29-1 to 29-2: Baffle plate

Claims (5)

An outer cylinder disposed in a steam flow path through which steam flows;
A water pipe that forms a spray water flow path through which spray water flows, and
With baffle plates,
The water pipe is disposed inside the outer cylinder so that a warming steam flow path through which warming steam flows is formed between the water pipe and the outer cylinder, and a mist formed from the spray water. Spray nozzles are formed,
The outer cylinder is formed with a hole through which the warming steam and the mist pass through the steam flow path,
The baffle plate is a temperature reducer disposed on the upstream side of the hole in the warming steam channel.   The temperature reducer according to claim 1, wherein the baffle plate is fixed to the water pipe.   The said outer cylinder is a temperature reducer as described in any one of Claims 1-2 in which the protrusion which protrudes toward the said water pipe from the circumference | surroundings of the said hole is further formed.   A warming steam supply pipe for supplying the warming steam separated from the pre-reheat steam to the warming steam flow path when the steam is generated by heating the pre-reheat steam with a reheater. The temperature reducer as described in any one of Claims 1-3 further equipped. An outer cylinder disposed in a steam flow path through which steam flows;
A water pipe that forms a spray water flow path through which spray water flows, and
With baffle plates,
The water pipe is disposed inside the outer cylinder so that a warming steam flow path through which warming steam flows is formed between the water pipe and the outer cylinder, and a spray nozzle for injecting the spray water is provided. Formed,
The outer cylinder is formed with a hole through which the warming vapor and the mist injected from the spray nozzle pass.
The baffle plate is a spray pipe for a temperature reducer disposed on the upstream side of the hole in the warming steam channel.

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