WO2014097426A1 - Pressure-adjusting mechanism and soot-blowing system having same - Google Patents

Abstract

A pressure-adjusting mechanism (20) provided in a circulation system of a fluid and adapted for adjusting the pressure of the fluid, wherein the pressure-adjusting mechanism (20) is provided with a main body section (21) and an adjustment section (22). The main body section (21) includes a first communication hole (211) and a second communication hole (212). The first communication hole (211) interconnects the upstream side and the downstream side of the circulation system, and has a cross-sectional area over which the minimum necessary pressure is applied on the downstream side. The second communication hole (212) interconnects the upstream side and the downstream side of the circulation system. The adjustment section (22) is capable of adjusting the cross-sectional area of the second communication hole (212).

Description

Soot blowing system equipped with pressure adjusting mechanism and pressure adjusting mechanism

The present invention relates to a pressure adjusting mechanism and a soot blowing system provided with the pressure adjusting mechanism.

Deposits such as soot and ash adhering to heat transfer surfaces such as heat exchangers installed in combustion chambers of power plants and the like (hereinafter simply referred to as deposits) It causes a decrease. In order to maintain the performance of a heat exchanger or the like, it is necessary to remove deposits attached to the heat transfer surface, and soot blowers are widely used as means for removing the deposits.

A long-drawing-type soot blowing device, one of the soot blowing devices, is installed in the vicinity of a combustion chamber where a heat transfer tube, which is a heat transfer surface of a heat exchanger such as a boiler, is arranged, and is provided with a nozzle. Is a device that removes deposits adhering to the heat transfer tube by going into and out of the high-temperature combustion chamber while rotating and injecting an injection medium such as high-pressure steam or air from the nozzle of the lance tube.

An example of a conventional long-drawing type soot blowing device is a long-drawing type soot blowing device 7 having a structure as shown in FIG. The long pull-out type soot blower 7 projects from the housing 78 and has a lance tube 70 formed with a nozzle 71 at the tip. The lance pipe 70 is connected to the motor 72 through the gear box 73 in the housing 78. The gear box 73 is configured to transmit the rotation of the motor 72 to the lance pipe 70 via a gear housed in the gear box 73. The gear box 73 is connected to a rack 74 in addition to the lance pipe 70. As the rack 74 and the pinion 76 assembled to the gear box 73 are engaged with each other, the lance pipe 70 moves in the axial direction along with the rotation and enters the high-temperature combustion chamber.
A feed pipe 75 for supplying the ejection medium is disposed inside the lance pipe 70. The feed pipe 75 is connected to the outlet of the valve 77, and is connected to a pipe 79 that supplies the injection medium via the valve 77. For this reason, when the long pulling type soot blower 7 is activated, the lance pipe 70 moves, the valve 77 is opened, and the injection medium is supplied to the feed pipe 75 and the lance pipe 70. As a result, the ejection medium is ejected from the nozzle 71, and deposits adhering to the surface of the heat transfer tube such as a boiler are uniformly removed. Further, since the lance pipe 70 enters the high-temperature combustion chamber and performs the removal work of the deposit, the lance pipe 70 is prevented from being damaged by supplying an injection medium into the lance pipe 70 and cooling it.

In such a soot blower, the supply amount of fluid, which is an injection medium supplied to the lance pipe 70, is adjusted by the valve 77, and the injection pressure from the nozzle 71 is adjusted. For example, Patent Document 1 discloses a technique of providing a throttle device on a valve. That is, in the technique of Patent Document 1, the supply amount of the injection casing supplied to the lance pipe is adjusted by changing the size of the area of the flow path cross section through which the injection medium in the valve can pass through the throttle device. The jetting pressure of the jetting medium jetted from the nozzle is adjusted.

Japanese Patent Laid-Open No. 2-287209

However, in the structure in which the supply amount of the injection medium is adjusted using the throttle device as described in Patent Document 1, it is difficult to finely adjust the area of the passage section through which the passage is possible. Has a problem that it cannot be sufficiently cooled in the combustion chamber and is damaged by exposure to high temperatures.

The present invention provides a pressure adjustment mechanism capable of easily adjusting the fluid supply amount while ensuring a minimum required fluid supply amount, and a soot blowing system including the pressure adjustment mechanism.

In order to solve the above problems, the present invention proposes the following means.
A pressure adjustment mechanism according to an aspect of the present invention is a pressure adjustment mechanism that is provided in a fluid circulation system and regulates the pressure of the fluid, and communicates the upstream side and the downstream side of the circulation system. A main body portion formed with a first through hole having a cross-sectional area that applies a minimum necessary pressure on the downstream side, and a second communication hole that communicates the upstream side and the downstream side of the distribution system; And an adjustment unit capable of adjusting a cross-sectional area of the second communication hole.

In the pressure adjusting mechanism, the first series of through holes are opened with a cross-sectional area that can always apply the minimum necessary pressure, so that the minimum necessary amount of fluid is always supplied to the downstream side of the distribution system. Can be supplied. Furthermore, the amount of fluid supplied to the downstream side can be adjusted by making the cross-sectional area of the second communication hole adjustable by the adjusting unit. As a result, it is possible to easily adjust the fluid supply amount while ensuring the minimum necessary fluid supply amount.

Further, in the pressure adjusting mechanism according to the second aspect of the present invention, the main body portion has a disc shape, and the first series of through holes and the second through hole are formed along the axial direction. A hole portion that opens to the outer peripheral surface and extends across the second communication hole is formed, and the adjustment portion may be adjustable from the outer peripheral surface side of the main body portion through the hole portion.

The pressure adjusting mechanism has a disk shape and can be installed if there is a small space in the direction in which the fluid flows in the distribution system. Since the adjustment part can adjust the cross-sectional area of the second communication hole from the outer peripheral surface via the through hole of the main body part having a disk shape, the supply amount of the fluid can be adjusted more easily.

Furthermore, in the pressure adjusting mechanism according to the third aspect of the present invention, the adjusting portion is formed in a shaft shape, and is inserted into the hole portion so as to be rotatable about its own central axis, and in a direction perpendicular to the central axis. There may be provided a shaft member in which a through-hole is formed and an operation portion provided in the shaft member and rotating the shaft member around the axis.

The pressure adjusting mechanism can easily adjust the cross-sectional area through which the fluid can flow in the second communication hole by rotating the shaft member by the operation unit. Since the fluid supply amount can be adjusted simply by rotating the operation unit, the supply amount can be easily finely adjusted at hand. Thereby, it becomes possible to adjust the supply amount of the fluid more easily.

Further, in the pressure adjusting mechanism according to the fourth aspect of the present invention, the distribution system is a supply system for supplying a cleaning fluid to the lance pipe of the soot blower, and a cross-sectional area of the first through hole is The minimum necessary pressure for securing the flow rate of the cleaning fluid necessary for cooling the lance tube may be set.

The pressure adjusting mechanism is provided in the supply system for supplying the cleaning fluid to the lance pipe of the soot blower, so that the lance pipe is always required to cool the lance pipe through the first through hole. The cleaning fluid can be supplied. This can prevent the lance tube from being damaged by heat.

Furthermore, a soot blowing system according to one aspect of the present invention includes a soot blowing device having a lance pipe for injecting a cleaning fluid, and a supply unit that supplies the cleaning fluid to the lance pipe, and the supply of the cleaning fluid. A supply pipe connected to the source, and the pressure adjusting mechanism provided between the supply pipe and the supply unit.

The above-described soot blowing system is provided with a pressure adjusting mechanism between the supply system of the soot blowing device and the supply pipe, so that the pressure adjusting mechanism can be easily installed on the existing soot blowing device afterwards. It becomes.

According to the pressure adjusting device of the present invention, it is possible to easily adjust the fluid supply amount through the second communication hole while securing the minimum fluid supply amount through the first communication hole.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It is a side view explaining the long draw difference type blow blowing apparatus which concerns on embodiment of this invention. It is an enlarged view explaining the pressure regulator which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line AA for explaining the pressure adjusting device according to the embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line BB when the second communication hole of the pressure regulator according to the embodiment of the present invention is opened. FIG. 5 is a cross-sectional view taken along the line BB when a part of the second communication hole of the pressure adjusting device according to the embodiment of the present invention is closed. FIG. 6 is a cross-sectional view taken along the line BB when the second communication hole of the pressure adjusting device according to the embodiment of the present invention is closed. It is a side view explaining the conventional long pulling type soot blower.

Embodiments according to the present invention will be described below with reference to FIGS. 1 to 5C.
The soot blowing system 1 of this embodiment is disposed adjacent to the combustion chamber 6 in which a heat exchanger or the like is disposed, for example, and spouts steam S as a fluid that is a cleaning fluid on the front surface, and adheres soot. Remove deposits such as. Specifically, as shown in FIGS. 1 and 2, the soot blowing system 1 of the present embodiment includes a soot blowing device 10 that injects the steam S, and the pressure of the steam S that is a fluid connected to the soot blowing device 10. The pressure adjustment mechanism 20 to adjust and the supply pipe | tube 30 connected to the pressure adjustment mechanism 20 from a supply source are provided.
The soot blower 10 is a lance pipe 11 that injects steam S as a fluid that is a cleaning fluid, a feed pipe 12 that supplies the steam S to the lance pipe 11, and a supply that regulates the supply of the steam S to the feed pipe 12. It has the part 120, the drive part 13 which drives the lance pipe | tube 11, and the housing 14 which covers the lance pipe | tube 11 and the drive part 13 from the outside.

In the present embodiment, a distribution system that is a supply system that supplies steam S from the supply source to the lance pipe 11 is formed, and the supply pipe 30 is arranged on the upstream side with the pressure adjusting mechanism 20 as a boundary, and the feed system is fed downstream. A soot blower 10 having a pipe 12 and a lance pipe 11 is disposed.

The lance tube 11 is formed in a hollow cylindrical shape and extends along the axial direction, and a nozzle 110 is formed as a hole opening in a circular shape on the side surface at the tip. The lance tube 11 is connected to a traveling carriage 131 which is a drive unit 13 at a base end portion.

The feed pipe 12 is a pipe that is inserted through the inside of the lance pipe 11, and causes the steam S to flow into the lance pipe 11 by circulating the steam S therein.
The supply unit 120 includes a head valve 121 that forms the main body of the supply unit 120, and a pressure gauge 122 that measures the pressure of the steam S that is the cleaning fluid in the head valve 121. It is connected to the feed pipe 12.

The head valve 121 includes a head valve main body 121a provided on the base end side of the housing 14 to be described later, and a flange portion formed to project in a ring shape on the outer periphery of the head valve main body 121a on the side not connected to the feed pipe 12. 121b.
The head valve main body 121a has a cylindrical shape, is connected to the feed pipe 12 on the downstream side, and has a valve structure for starting and stopping the supply of the steam S to the feed pipe 12 inside. The head valve body 121a starts supplying steam S to the feed pipe 12 by opening the valve structure, and stops supplying steam S to the feed pipe 12 by closing the valve structure.
The flange portion 121b has a plurality of fixing holes penetrating in the axial direction along the outer periphery.
The pressure gauge 122 measures the pressure of the steam S in the head valve 121. The pressure increases as the amount of the steam S supplied into the head valve 121 increases, and the pressure decreases as the amount of the steam S decreases. Display the value. The pressure gauge 122 may be any pressure gauge that can measure and display the steam S in the head valve 121. For example, a known pressure gauge is used. Moreover, the pressure gauge 122 does not need to be always attached. For example, the pressure gauge 122 may have a detachable attachment seat, and may be configured to be attached and used only when necessary.

The drive unit 13 includes a rotating motor 130, a traveling carriage 131 connected to the motor 130 and provided with a plurality of gears, and a rack 132 fixed to the housing 14.
The motor 130 is disposed in parallel with the lance tube 11 so that the rotation shaft is disposed along the axial direction of the lance tube 11.
The traveling carriage 131 forms a cubic box and has a plurality of gears built therein. The traveling carriage 131 is disposed so as to penetrate the feed pipe 12 inside, and the lance pipe 11 is rotatably fixed so that the feed pipe 12 is inserted inside. The traveling carriage 131 is connected to the motor 130 and receives the rotation of the motor 130 by the input shaft. The traveling carriage 131 converts the rotation direction into a direction orthogonal to the rotation shaft of the motor 130 and transmits the rotation direction to the output shaft via an internal gear. The rotation speed is changed and the rotation is transmitted to the lance tube 11.
The rack 132 is fixed to the housing 14, and the lance pipe 11 can be moved in the axial direction of the lance pipe 11 together with the traveling carriage 131 via the output shaft of the traveling carriage 131.

The housing 14 is formed in a box shape so as to cover the lance tube 11 and the drive unit 13 from the outside, and is installed so as not to move. The housing 14 is provided with a circular hole on the side surface at the first end, and the lance tube 11 is inserted therethrough. The housing 14 is provided with a head valve 121 on the side surface of the base end portion.

The supply pipe 30 is a pipe that supplies the steam S from the supply source of the steam S, and is connected to the head valve 121 via the pressure adjustment mechanism 20. The supply pipe 30 has a supply pipe flange portion 301 formed to project in a ring shape on the outer periphery of the end portion on the head valve 121 side.
The supply pipe flange portion 301 has a plurality of fixing holes penetrating in the axial direction along the outer periphery. The fixing hole of the flange portion 121b of the head valve 121 and the fixing hole of the supply pipe flange portion 301 are arranged to communicate with each other, and are fixed to the soot blower 10 by bolts 50 and nuts 51 with the pressure adjustment mechanism 20 interposed therebetween.

As shown in FIGS. 3 and 4, the pressure adjusting mechanism 20 has a disk shape with a hole formed therein, and is sandwiched and fixed between the head valve 121 and the supply pipe 30. The pressure adjusting mechanism 20 has a disk shape, a main body portion 21 in which a first communication hole 211 and a second communication hole 212 are formed to communicate the upstream side and the downstream side along the axial direction, and the outer periphery of the main body portion 21. And an adjustment portion 22 that is disposed in a hole portion 213 that opens to the surface and extends across the second communication hole 212.

The first series of through holes 211 are a plurality of circular holes (10 in the present embodiment) and communicate with the main body 21 in the axial direction from the upstream side to the downstream side. It is formed concentrically apart from the center. The first series of through holes 211 has a total of a plurality of circular cross-sectional areas in order to secure a supply amount of steam S necessary for cooling the lance pipe 11 when the soot blower 10 is driven. The valve 121 is formed to have a cross-sectional area that can provide the necessary pressure.
The second communication hole 212 communicates the main body 21 in the axial direction from the upstream side to the downstream side, and is formed in a long hole shape at the center of the disk-shaped main body portion 21.

The hole portion 213 is circularly opened in a direction orthogonal to the axial direction so as not to penetrate the main body portion 21 from the disk-shaped outer peripheral surface, and the first series of through holes 211 cross the second communication hole 212. It is formed so as not to.
The disk fixing hole 214 is formed with a plurality of circular holes penetrating in the axial direction along the outer periphery of the main body portion 21. The disk fixing hole 214 is disposed so as to communicate the fixing hole of the flange portion 121b of the head valve 121 and the fixing hole of the supply pipe flange portion 301. The bolt 50 is inserted to fix the main body portion 21. Yes.

The adjusting unit 22 fixes the columnar shaft member 221 inserted into the hole 213, the operation unit 222 provided at the end of the shaft member 221, and the shaft member 221 so as not to drop out of the hole 213. And a fixing portion 223.
The shaft member 221 is a cylindrical member having a cylindrical shape, and is inserted into the hole portion 213 so as to be rotatable around the central axis of the hole portion 213 by forming a shape slightly smaller than the hole portion 213. Yes. The shaft member 221 passes through the shaft member 221 in a direction orthogonal to the axis of the shaft member 221 at a position corresponding to the second communication hole 212, and a flow hole 221 a is formed.
The flow hole 221a has a long hole shape that is the same size as the cross-sectional shape of the second communication hole 212, and is formed through the shaft member 221 in a direction orthogonal to the axis of the shaft member 221.

The operation portion 222 is formed to protrude from the end surface of the shaft member 221 into a prismatic shape having a smaller diameter than the shaft member 221, and has a marking portion 222 a on the end surface that is not connected to the shaft member 221. .
The marking portion 222a is a linear marking drawn on the diagonal line of the prism, and is drawn such that the extending direction of the linear marking coincides with the opening direction of the flow hole 221a formed in the shaft member 221. Yes.
Even when the shaft member 221 is inserted into the hole 213, the operation unit 222 is formed so as to project the marking portion 222a side of the operation unit 222 to the outside, and the operation unit 222 itself is gripped by a tool or the like and rotated. Thus, the shaft member 221 is rotated around the axis.

The fixing portion 223 includes a fixing plate 223 a that holds the shaft member 221 so as not to fall out of the penetration, and a fixing bolt 223 b that fixes the fixing plate 223 a to the outer peripheral surface of the main body portion 21.
The fixing plate 223a is formed in a plate shape with a hole, and a hole through which the operation unit 222 is inserted and a hole through which the fixing bolt 223b is inserted are formed.
A known bolt may be used as the fixing bolt 223b.
The fixing portion 223 is fixed so that the shaft member 221 is not dropped from the hole portion 213 by inserting the operation portion 222 through the hole portion of the fixing plate 223a and fixing the operation portion 222 to the outer periphery of the main body portion 21 with the fixing bolt 223b. .

Next, the operation of the soot blowing system 1 including the pressure adjusting mechanism 20 having the above-described configuration will be described.
When the soot blower 10 is operated, the motor 130 is driven to start rotation and movement, and the valve structure of the head valve 121 is opened. As a result, while the steam S is jetted from the nozzle 110 of the lance tube 11, the lance tube 11 rotates and travels in the axial direction of the lance tube 11, so that deposits attached to the heat transfer tubes in the combustion chamber 6 are removed. Remove.

Specifically, when the motor 130 starts to rotate, the rotation is transmitted to the input shaft of the traveling carriage 131 and transmitted to the gear in the traveling carriage 131. The rotation transmitted in the traveling carriage 131 is transmitted to the lance pipe 11 by changing the rotation speed by the first gear, thereby rotating the lance pipe 11. Further, the rotation transmitted in the traveling carriage 131 is converted into rotation of a shaft that is orthogonal to the input shaft by the second gear and transmitted to the output shaft. The output shaft of the traveling carriage 131 is engaged with the rack 132 provided in the housing 14 and rotated to advance the traveling carriage 131 together with the lance pipe 11 in the axial direction of the lance pipe 11. It jumps out of 14 and enters the combustion chamber 6.

On the other hand, by opening the valve structure of the head valve 121, the steam S supplied from the supply pipe 30 via the pressure adjustment mechanism 20 is caused to flow into the feed pipe 12. The steam S flowing in the feed pipe 12 enters the lance pipe 11 and advances in the lance pipe 11 in the axial direction of the lance pipe 11. The steam S that reaches the nozzle 110 of the lance pipe 11 is jetted from the nozzle 110.

Here, as shown in FIG. 4, the pressure adjusting mechanism 20 rotates the shaft member 221 inserted into the hole 213 of the main body portion 21 by rotating the operation portion 222 from the outside, and the second communication hole 212. The open sectional area is adjusted, and the supply amount of the steam S supplied to the head valve 121 is adjusted. When the supply amount of the steam S into the head valve 121 is adjusted, the supply amount of the steam S in the lance pipe 11 is also adjusted, so that the injection pressure of the steam S injected from the nozzle 110 is also adjusted. Become.

Moreover, when stopping the soot blower 10, the rotation transmitted by reversely rotating the motor 130 is changed to reverse rotation. As a result, the output shaft rotates in the reverse direction, and the lance tube 11 is retracted in the axial direction of the lance tube 11 and accommodated in the housing 14.
Thereafter, by closing the valve structure of the head valve 121 and stopping the supply of the steam S, the inflow of the steam S to the feed pipe 12 is stopped, and the injection of the steam S from the nozzle 110 of the lance pipe 11 is stopped.

Next, details of a method of adjusting the supply amount of the steam S, which is the cleaning fluid, to the head valve 121 by the pressure adjusting mechanism 20 will be specifically described with reference to FIGS. 5A to 5C.
As shown in FIG. 5A, the operation unit 222 is rotated to adjust the direction of the shaft member 221 that is the adjustment unit 22, the opening direction of the flow hole 221 a provided in the shaft member 221, and the second communication of the main body unit 21. The opening direction of the hole 212 is made parallel to match. Since the opening direction of the circulation hole 221a coincides with the line of the marking part 222a provided on the end face of the operation part 222, the opening direction of the circulation hole 221a is confirmed while checking the marking part 222a. Since the cross-sectional shape of the flow hole 221a is the same as that of the second communication hole 212, when the opening direction coincides, the second communication hole 212 is completely opened, and steam supplied from the first communication hole 211 is supplied. Together with S, the supply amount of the steam S supplied to the head valve 121 is maximized.

As shown in FIG. 5B, the operation unit 222 is rotated to adjust the orientation of the shaft member 221 that is the adjustment unit 22, the opening direction of the flow hole 221 a provided in the shaft member 221 of the adjustment unit 22, and the main body unit 21. It arrange | positions so that the opening direction of the 2nd communicating hole 212 may shift | deviate. That is, the opening direction of the flow hole 221a is set to be in a range from parallel to a right angle with respect to the second communication hole 212. As a result, a part of the opening of the second communication hole 212 is overlapped and closed with the shaft member 221 and the other part is overlapped and opened with the flow hole 221a. Therefore, the amount of steam S that can flow through the second communication hole 212 is reduced, and the supply amount of steam S to the head valve 121 is reduced.
The first through hole 211 is always open. For this reason, the steam S always flows through the first series of through holes 211.

In addition, by rotating the operation portion 222 and adjusting the direction of the shaft member 221, the size of the portion that overlaps and penetrates between the second communication hole 212 and the flow hole 221 a can be adjusted and supplied to the head valve 121. The amount of steam S supplied can be adjusted. At this time, by rotating the operation unit 222 while checking the pressure gauge 122, fine adjustment can be performed while checking the supply amount of the steam S into the head valve 121. That is, the supply amount of the steam S supplied into the head valve 121 is changed by changing the size of the portion where the second communication hole 212 and the flow hole 221a overlap and open, and the pressure changes accordingly. Therefore, the supply amount of the steam S in the head valve 121 can be confirmed by the pressure gauge 122 provided in the head valve 121.

As shown in FIG. 5C, the operation unit 222 is further rotated to adjust the orientation of the shaft member 221 that is the adjustment unit 22, and the opening direction of the flow hole 221a provided in the shaft member 221 of the adjustment unit 22 and the main body It arrange | positions so that the opening direction of the 2nd communicating hole 212 of the part 21 may turn to right angle. The second communication hole 212 is in a state in which the opening overlaps with the shaft member 221 and is completely closed. Therefore, the steam S is not supplied from the second communication hole 212 to the head valve 121. However, since the first through hole 211 is always open, the supply of the steam S is not completely cut off, and the minimum necessary amount of the steam S is generated according to the cross-sectional area of the first through hole 211. Supplied.

According to the pressure adjusting mechanism 20 as described above, the flow rate of the steam S necessary for cooling the lance pipe 11 when the first through hole 211 always drives the soot blower 10 can be secured. Further, by opening a cross-sectional area that can provide the necessary supply pressure with the head valve 121, it is possible to supply a necessary amount of steam S to the lance pipe 11 on the downstream side of the distribution system that is the supply system. . Furthermore, the supply amount of the steam S supplied to the lance pipe 11 can be adjusted by adjusting the opening size of the second communication hole 212 by the adjusting unit 22 and making the cross-sectional area adjustable. This makes it possible to easily adjust the supply amount of the steam S that is a fluid while ensuring the necessary supply amount of the steam S that is a fluid.

Further, since the pressure adjusting mechanism 20 has a disk shape, the pressure adjusting mechanism 20 can be arranged in a slight space in the direction in which the fluid flows in the flow system of the head valve 121 and the supply pipe 30. Therefore, it can be provided in a slight space such as between the head valve 121 and the supply pipe 30, and the pressure adjustment mechanism 20 can be attached without greatly modifying existing equipment. .

Furthermore, the adjustment part 22 can adjust the opening size of the second communication hole 212 from the outer peripheral surface via the hole part 213 of the main body part 21 having a disc shape, so that the cross-sectional area of the opening through which the steam S flows is adjusted. The troublesome operation of adjusting the supply amount of the steam S by exchanging the different orifices becomes unnecessary. Thereby, it becomes possible to adjust the supply amount of the steam S which is a fluid more easily.

Further, by rotating the shaft member 221 by the operation unit 222, the opening area of the second communication hole 212 can be easily adjusted by opening or closing. Since the supply amount of the steam S can be adjusted simply by rotating the operation unit 222 arranged outside the main body 21 of the pressure adjustment mechanism 20, the supply amount can be adjusted while checking the pressure gauge 122 provided in the head valve 121. Fine adjustment at hand is easy. Thereby, the supply amount of the vapor | steam S which is a fluid can be adjusted much more easily.

Further, in the conventional throttle device as described in Patent Document 1, it is difficult to finely adjust the area of the cross section of the flow path through which the steam S can pass, and the steam supplied during operation while checking the operation status of the soot blower 10 It is difficult to finely adjust the supply amount of S. However, by using the pressure adjusting device 20 of the present embodiment, after the valve structure of the head valve 121 during operation of the soot blowing apparatus 10 is opened, the supply amount of the steam S is changed separately from the valve structure of the head valve 121. Fine adjustment can be made. As a result, it is possible to supply an appropriate amount of steam S to the lance pipe 11 while confirming the operation status of the soot blower 10.

Moreover, in the soot blower 10, the steam S supplied to the lance tube 11 not only removes deposits from the heat transfer tube, but also cools the lance tube 11 when the lance tube 11 enters the high-temperature combustion chamber 6. Thus, it also has a function of preventing damage due to heat. Therefore, if the amount of steam S required for cooling is not supplied to the lance pipe 11 during operation of the soot blower 10 due to a pressure adjustment error, the lance pipe 11 is not supplied with the amount of steam S required for cooling. 6 and may be damaged by heat without being cooled. However, the pressure adjusting mechanism 20 of the present embodiment is provided in the supply system for supplying the steam S to the lance pipe 11 of the soot blower 10, so that the lance pipe 11 is cooled from the first through hole 211. The amount of steam S necessary to do so can be supplied. As a result, even if the second communication hole 212 is closed unintentionally due to malfunction, it is possible to prevent the lance pipe 11 from entering the combustion chamber 6 and being damaged by heat.

Furthermore, the soot blowing device 10 itself is provided by providing the pressure adjusting mechanism 20 between the head valve 121 that is the end of the supply system of the soot blowing device 10 and the supply pipe 30 that is the piping that supplies the steam S. Since it is not necessary to modify, the pressure adjusting mechanism 20 can be easily installed afterwards with respect to the existing soot blower 10.

Further, by using such a pressure adjusting mechanism 20 for the soot blower 10, the cross-sectional area of the second communication hole 212 is adjusted to be small when the heat transfer tube is not greatly contaminated and deposits are hardly adhered. When the supply amount of the steam S to the head valve 121 part is decreased, the amount of the steam S in the lance pipe 11 is decreased, the injection pressure from the nozzle 110 is lowered, and an excessive pressure is applied to the heat transfer pipe to be removed. Damage can be prevented without causing damage. Thereby, lifetime improvement of the heat exchanger tube etc. which become removal object can be aimed at.
On the other hand, when the heat transfer tube is greatly contaminated and a large amount of deposits are adhered, the cross-sectional area of the second communication hole 212 is adjusted to be large, and the supply amount of the steam S to the head valve 121 is increased. Then, the injection pressure from the nozzle 110 increases, and the deposit removal performance can be improved. Thereby, it becomes possible to remove deposits efficiently.

The embodiments of the present invention have been described in detail with reference to the drawings. However, the configurations and combinations of the embodiments in the embodiments are examples, and additions and omissions of configurations are within the scope not departing from the spirit of the invention. , Substitutions, and other changes are possible. Further, the present invention is not limited by the embodiments, and is limited only by the scope of the claims.

Further, the pressure adjustment mechanism 20 does not need to be provided between the head valve 121 and the supply pipe 30 as in the present embodiment, and may be provided in the flow path for the steam S that is a fluid. The head valve main body 121a may be incorporated.
Furthermore, it is not limited to being used for the soot blowing apparatus 10 of the soot blowing system 1 of this embodiment, For example, you may use a stationary rotation type soot blowing apparatus and a short pulling type soot blowing apparatus. .

Moreover, the shape of the 1st communicating hole 211 and the 2nd communicating hole 212 is not restricted to this embodiment, For example, you may form in a circular hole part, respectively.
Further, one hole portion larger than the width of the shaft member 221 of the adjustment portion 22 is formed, a portion not blocked by the adjustment portion 22 is defined as the first series of through holes 211, and the flow hole 221a itself is defined as the second communication hole. It may be 212.
In addition, the pressure adjusting mechanism 20 according to the present invention is not limited to being used in the soot blowing device 10, but may be used in a distribution system that supplies a fluid by applying a minimum necessary pressure to the downstream side. good.
Furthermore, the cross-sectional shape of the flow hole 221a is not limited to the same size as the cross-sectional shape of the second communication hole 212. For example, the cross-sectional shape of the flow hole 221a may be large, or conversely small. Also good. That is, it may be appropriately changed depending on the apparatus to be used and the minimum required supply amount of the steam S that is a fluid.
Further, the supply unit 120 is not limited to a structure that is independently opened or closed as in the present embodiment. For example, the valve structure of the head valve 121 is interlocked with the progress and opening of the lance pipe 11. As an opening / closing device that opens or closes, a structure that automatically opens or closes according to the movement of the lance tube 11 may be adopted.

The present invention relates to a pressure adjusting mechanism and a soot blowing system provided with the pressure adjusting mechanism. According to the pressure adjusting device of the present invention, it is possible to easily adjust the fluid supply amount by the second communication hole while securing the minimum necessary fluid supply amount by the first communication hole.

DESCRIPTION OF SYMBOLS 1 ... Sobuki system 10 ... Sobuki device 11 ... Lance pipe 110 ... Nozzle 12 ... Feed pipe 120 ... Valve part 121 ... Head valve 121a ... Head valve body 121b ... Flange part 122 ... Pressure gauge 13 ... Drive part 130 ... Motor 131 ... Traveling carriage 132 ... Rack 14 ... Housing 20 ... Pressure adjustment mechanism 21 ... Main body 211 ... First communication hole 212 ... Second communication hole 213 ... Hole 214 ... Disk fixing hole 22 ... Adjustment part 221 ... Shaft member 221a ... circulation hole 222 ... operation part 222a ... engraved part 223 ... fixing part 223a ... fixing plate 223b ... fixing part bolt 50 ... bolt 51 ... nut 30 ... supply pipe 301 ... supply pipe flange part 6 ... combustion chamber

Claims (5)

A pressure adjusting mechanism provided in a fluid distribution system for adjusting the pressure of the fluid;
The upstream side and the downstream side of the distribution system communicate with each other, and the first through hole having a cross-sectional area that applies a minimum necessary pressure on the downstream side, and the upstream side and the downstream side of the distribution system communicate with each other. A main body portion formed with a second communication hole,
A pressure adjustment mechanism comprising: an adjustment portion capable of adjusting a cross-sectional area of the second communication hole. The main body is
Forming a disk shape, the first series of through holes and the second communication hole are formed along the axial direction, and a hole that opens to the outer peripheral surface and extends across the second communication hole is formed. And
The pressure adjusting mechanism according to claim 1, wherein the adjusting unit is adjustable from the outer peripheral surface side of the main body through the hole. The adjustment unit is
A shaft member that is formed in a shaft shape, is inserted into the hole portion so as to be rotatable around its center axis, and is formed with a flow hole penetrating in a direction orthogonal to the center axis;
The pressure adjusting mechanism according to claim 2, further comprising: an operating portion that is provided on the shaft member and rotates the shaft member about an axis. The distribution system is a supply system for supplying a cleaning fluid to the lance pipe of the soot blower,
The cross-sectional area of the first through hole is set to be able to apply a minimum necessary pressure for securing a flow rate of the cleaning fluid necessary for cooling the lance pipe. Item 4. The pressure adjustment mechanism according to any one of Items 1 to 3. A soot blowing device having a lance pipe for injecting a cleaning fluid and a supply section for supplying the cleaning fluid to the lance pipe;
A supply pipe connected to a supply source of the cleaning fluid;
A soot blowing system comprising: the pressure adjusting mechanism according to any one of claims 1 to 4 provided between the supply pipe and the supply unit.

Images