JPS60150435A - Combustion gas pipe line mechanism for regenerative gas turbine - Google Patents

Abstract

PURPOSE:To aim at absorbing thermal-expansion, by providing expansion joints each provided with a hinge and two expansion joints each provided with gimbals in pipe lines between a combustor and a regenerator, and as well by bearing the weight of the pipe lines with the use of spring hangers. CONSTITUTION:The vertical sections of a discharge pipe 24 and a return pipe 25 connecting between a combuster 18 and a regenerator 22, are provided with expansion joints 27, 29 each provided with a hinge, respectively, and the horizontal sections thereof are provided with expansion joints each provided with gimbals two in each pipe line. Further, with the use of spring hangers 38 through 43 the weight of the discharge and return pipe lines 24, 25 are supported, and as well with the use of hydraulic vibration dampers 44 through 46 the expansion joints 26, 28 provided with gimbals are supported. With this arrangement, force which generates due to thermal expansion may be completely absorbed.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] Akira Honzura is a specialist in heat treatment. This article relates to a Vll raw gas turbine Zakukuru fuel μ'8 air piping system that solves the problem of fa'f during the process.

[Background of the invention]

In a regenerative gas turbine cycle engine, the combustion air piping that connects the combustor and the regenerator has a large diameter and is short.

In addition, combustion air at city temperature flows through this arrangement, causing the piping to thermally expand.

As described above, in a large-diameter, short piping system, bellows are used because it is not possible to pull the piping to absorb thermal expansion, such as with a vent or octopus bend, unlike in a long piping system.

In addition, since the piping system is bent in a complicated three-dimensional manner, thermal deformation due to thermal expansion also results in a complicated three-dimensional hand shape, and due to this thermal deformation, the combustor and A large force will be applied to the connections of the regenerator.

In order to handle this large force, the combustor and regenerator must have a strong structure, but in general-purpose raw gas turbine cycle engines in particular, weight reduction is required, and the above-mentioned arrangement and U This is a major technical problem in relation to the thermal expansion of the system. .

The combustion air piping system of a conventional regenerative gas turbine cycle is shown in FIG. 1 (front view) and FIG. 2 (plan view) and will be described.

In the figure, a gas turbine 2, an air compressor 3, and a driven machine 4 such as a power generator are arranged linearly as shown in the figure, and in this example, a combustor 6 is installed independently of the gas turbine 2 and in the vicinity thereof. It is set in.

The regenerator 5 is provided on an axial extension of the turbine.

The high-temperature compressed air sent out from the air compressor 3 is sent to the regenerator 5 through the axially symmetrical combustion air discharge pipe 7, where:
After being preheated by the turbine exhaust gas, it is supplied to the combustor 6 by a combustion air return pipe 8 . 9 is a waste heat boiler.

In this conventional piping system, the discharge v7 is symmetrical with respect to the axis of the gas turbine in order to prevent harmful external forces due to thermal expansion of the piping system from being applied to the rotating system or rotor vibration system of the gas turbine 2. The external force generated by the thermal expansion acts in the axial direction or axially symmetrically of the gas turbine 2.

In this way, in the past, only the protection of the rotation system and rotor vibration system of the gas turbine 2 was considered, and a large and sturdy turbine was used to absorb the thermal expansion of the piping system. Further, along with this, a sturdy frame 1, a regenerator, and a combustor are also required, which has the disadvantage of being large and increasing the amount of M.

In addition, because the piping system is large in diameter and short, there is little flexibility in piping, and it is difficult to assemble on-site unless the accuracy of equipment alignment and the manufacturing height of piping, extension 4, and rectangular joints are high. There were drawbacks.

[Purpose of the invention]

The present invention aims to provide a combustion air piping system for a regenerative gas turbine cycle that solves the above-mentioned conventional problems by increasing the flexibility or freedom of deformation of the combustion air piping system.

[Summary of the invention]

That is, the present invention provides a degree of freedom for deformation of the piping system by using three expansion joints.The first invention provides a hinged expansion joint in the vertical part of the discharge pipe, and also provides a horizontal Two gimbaled expansion joints are installed in the vertical part of the return pipe, and two gimbaled expansion joints are installed in the horizontal part of the return pipe to provide flexibility against deformation of the piping system. Further, the piping system is characterized in that its own weight is supported by a spring hanger, and a hydraulic vibration isolator is connected to the gimbaled expansion joint to prevent vibration of the piping system.

A second invention provides a discharge pipe and l of the piping system of the first invention.
A vent valve is provided vertically above the vertical part of the heating connection section with the generator to reduce the jet reaction force of the air released when the load is interrupted.

A third invention provides a steam blowing nozzle in the vertical part of the connection between the return pipe and the regenerator in the piping system of the first invention to atomize the condensate accumulated in the return pipe. It is characterized by preventing water discharge and vibration from occurring.

[Embodiments of the invention]

An embodiment of the present invention will be described below. In Figure 43 (top view) and Figure 4 (front view), the turbine body 11
11: Consists of a compressor casing 13 installed on a turbine base 12, a turbine casing 14, a turbine internal IE 11 casing 15, and an outer cylinder 18 forming a combustor casing. 22 is a regenerator, and between it and the outer cylinder 18,
A discharge pipe 24 and a return pipe 25 are connected to each other. The discharge pipe 24 is provided with a hinged expansion joint 27 in the vertical part 24b and two gimbaled expansion joints 26 in the horizontal part 24C, and is connected to the town generator 22 at the straight part 24a. U
It forms a cursive bend. In addition, the return pipe 25 is provided with two gimbaled expansion joints 28 on the horizontal part and a hinged expansion joint on the vertical part 25a, and is connected to the outer cylinder 18 through the vertical part 25b, thereby creating a U-shaped bend. is doing.

The above-mentioned hinged expansion joint is shown in FIG. 6 (a) plan view and (b)
), pipes 24/ and 25/ are connected to both ends of the thin bellows 48, and the pipes 24'
, 25' are provided with flanges 47.

A hinge arm 49 connected at the center by a hinge pin 50 is attached to this flange 47 to maintain a pressure load of several tens of tons within the pipe.

The expansion joint with hinge pin configured in this way is rotatable around the hinge bin 50.

On the other hand, the gimbaled expansion joint has a gimbal pin provided in a direction perpendicular to the hinge pin 50 of the hinged expansion joint, and the piping can be bent freely in all directions.

FIG. 5 shows an arrangement system for explaining a 1y-1 solution. In the figure, a right angle 131i 4-vote system is taken in which the axial direction 47 of the turbine is ZI, the horizontal part of the combustion air piping is X'++II, and the vertical direction is Y+l+I+.

The hinged expansion joint 27 provided on the discharge pipe has a flange 34.
The piping is rotatable around the hinge bin in the Z direction. The gimbaled expansion joint 26 is
In addition to the hinge pin in the Z direction, there is a gimbal pin in the Y direction that intersects with this by 1r, so the layout is t-j, so
It can rotate freely around each pin. On the other hand, the fruitful thunder is 2
An expansion joint 29 with a hinge pin that is rotatable around the hinge pin provided in the direction, and an expansion joint 28 that is rotatable around the pin provided in the Z direction and the Y direction.
There is one set up. 38-43i'i are spring hangers that support the vehicle. 44°45.4
6 is a hydraulic vibration isolator, one end of which is attached to the gimbal f=r expansion joint 26.28, and the bent end is attached to a separately provided solid fitting point.
Prevents piping from shaking atJJ.

The operation of this embodiment configured as above will be explained using FIG. 5.

First, the piping system is under normal conditions when cold.
It is elastically supported by spring hangers 38 to 43 in a completely non-rigid state by the expansion joint with hinge pin 34.29 and the expansion joint with gimbal 26.28.

From this state, the operating cycle begins]111j-c1 The gas turbine 11, the regenerator 22, and the piping system rise in temperature and thermally expand. Due to this thermal expansion, the distribution system becomes x, y.

Thermal expansion occurs in the Z direction.

In this thermal expansion, the thermal expansion e in the X direction is absorbed by the rotation around the hinge pin of the expansion joint with hinge pin 27.29, and the combined rotation around the hinge pin in the Z and Y directions of the expansion joint with gimbal 26.28. be done.

In addition, thermal expansion in the Z direction and Y direction is caused by expansion joint 2 with gimbal.
It is absorbed by the combined rotation around the hinge bin in the Z and Y directions of 6.28.

In this way, the amount of thermal expansion of the piping system is determined by the hinged expansion joint 2
7.29 and the external force due to the thermal expansion of the piping system is absorbed by the rotation around each bottle of the gimbaled expansion joint 26 and 28, and the external force due to the thermal expansion of the piping system is It doesn't cost.

Next, we put sleeves on the first folded yarn, and in addition to thermal expansion, as a dynamic load,
For example, due to the pressure drop or decompression of the combustion air, a large impact force is exerted on the arrangement system.
II may cause vibration.

This vibration mainly acts in the Y direction. As a result, the distributed yarn bends around the Z-direction pin of the gimbal y τJ expansion joint 26, 28, and may resonate with the vibrations of the spring hangers 38 to 43, the turbine 11, and the regenerator 22.

This vibration is prevented by hydraulic preventers 44-46. That is, the hydraulic vibration isolators 44 to 46 are installed in a press-like manner (bracing) with respect to the piping system, and the vibration isolators 44 to 46 are installed in a press-like manner (bracing) with respect to the piping system. Since it is designed to act as a reinforcing material for 1,
This simultaneously prevents vibrations in the X and Y directions.

Also, the spring hanger that supports the discharge 'tft is 38°39.
40 to slightly exceed the own weight of the hinged expansion joint 27 and the gimbaled expansion joint 2.
By eliminating the play in 6 and keeping the piping in a tensioned state, the impact when the turbine is stopped or started is softened.

On the other hand, the spring hanger that supports the return loaf 41°42.4
3 is slightly weaker than the weight of the piping, and the overall force is 7 runs:) 36. Balance the force in the upward direction applied to 37.

ε: A return pipe is illustrated in FIG. 17, and conventional piping systems corresponding thereto are shown in FIGS. 8 and 9, and the force acting on the flange due to thermal expansion of the piping system will be explained in more detail.

First, in this embodiment shown in FIG. 7, when the renal system relatively expands by several tens of millimeters due to thermal expansion, a vertical pipe 25a is installed around the hinge bin H of the expansion joint 29 with a hinge bin.
, and rotates by an angle θ. This 1ijJ rotation becomes iiJ function due to the spring hanger 43. Therefore, only the force FIi in the X direction applied to the flange 36 and the bending reaction force of the bellows 48 (see j1@ in FIG. 6) of the expansion joint 29 with hinge bin are forces MloKg, which can be ignored. A similar force is also applied to the flange portion of the regenerator 22. Further, the pressure thrust based on the internal pressure of the pipe is zero because it escapes due to the rotation of the vertical pipe 25a.

In comparison, the conventional piping system, as shown in Figure 8,
A bellows 36.degree. 53 without a hinge mechanism is used, and the piping is firmly fixed by an external annular force 51.degree. 52.

In this piping system, the compressive force of the bellows acts on the flange 36 due to thermal expansion of the piping, and this compressive force becomes a force of about 1 ton compared to the bending force of the bellows.

On the other hand, the pressure thrust force based on the internal pressure of the pipe is
1.52, the reaction force P or P' force is received, so the pressure thrust force P or P' equal to the reaction force is applied to the outer cylinder 1.
8 (in the case of this embodiment, the external anchor 5
Since the Suzu ring hanger 24 is used instead of 1.52, it does not receive the reaction force of the pressure thrust force, so P or P'
is zero).

This pressure thrust force is equal to the pressure exerted by the air column in the pipe on the air column in the combustor, so it becomes a pressure thrust force of as much as 10 tons. This large pressure thrust force causes the turbine to float and increase vibration.

FIG. 9 shows an example in which a balanced bellows 55 is used on the regenerator 22 side. In this case as well, the reaction force of the compression force of the bellows is as much as 1 ton, which is acceptable on the regenerator side, but not on the turbine side, which has a rotating part.

FIGS. 10 and 11 are other implementations 1+1. First, the embodiment shown in FIG. 10 is obtained by adding a blowoff valve to the piping system of the embodiment shown in FIGS. 3 and 4.

In FIG. 10, a discharge pipe 24 connected to a regenerator 22
Vertical? A blowoff valve 56 is installed vertically above the fI 124a. An air blast pipe 56' is provided at the tip of the air blast pipe 56'.
A ventilation duct 57 is provided with a gap between the elm closure 30 and the elm closure 30.

In this implementation train configured in this way, during load shedding (・
In order to suppress the overspeed of the C1 gas turbine,
Release nitrogen gas for combustion to the outside.

In this case, the jet reaction force due to the discharge acts on the piping, causing a large force to be applied to the flange and causing vibration.

This jet reaction force is absorbed by the spring hanger.

That is, the jet reaction force when released from the air discharge valve 56 is:
Since the force acting in the axial direction of the vertical interlayer 24H and the 9111 force of the spring hanger 40 provided at -C along its axis also acts in the axial direction, the biconvex force between and
' 24 It will be balanced within the axis of a.

Therefore, the jet reaction force is completely absorbed by the spring hanger 40.

Next, the embodiment shown in FIG. 11 is the same as the small embodiment shown in FIGS. 3 and 4, with a steam jet nozzle added.

That is, in the embodiments of Figures 3 and 4, the return positive 25
The steam is ejected to the vertical arrangement 25a, and a large number of steam injection nozzles 62 are provided on the circumference of the vertical arrangement W 24a. 58 is an annular steam injection manifold, and the steam injection manifold 58 and the steam injection nozzle 62 are connected by a pipe 52. Note 6
0 is support.

In this embodiment configured as described above, drain easily accumulates in the U-shaped return pipe 25 (see Figure 21'S3 and Figure 4), and this drain causes water leakage.
This will generate vibration in the distribution system and will also give a large impact force to the flange t%.

In such a case, 7A air is injected from the steam injection nozzle 62 along the inner periphery of the piping.
yt abbreviate and eliminate.

In addition, by ejecting steam, the temperature difference between the temperature and the nitrogen gas is reduced, the thermal stress in the long-lasting portion 61 is relaxed, and the thermal shock or erosion caused by the steam or condensate injected onto the inner wall of the H system is reduced. Reduce the effect.

[Effect of investigation]

As detailed above, according to the regenerative gas turbine cycle combustion air arrangement R system according to the present invention, by using a hinged expansion joint and two gimbaled expansion joints, the rigidity of the arrangement is reduced to zero7, and the dead weight of the piping is is supported by a spring hanger, and the gimbal is supported by a vertical joint by a hydraulic vibration isolator, making it possible to absorb all the force generated by thermal expansion of the piping system within the distribution system. , the power at the connection with the combustor and regenerator could be completely exposed.

Hydraulic vibration isolation also prevents vibrations in the distribution and g systems! The hII is completely II) month h-, and the spring hanger allows the fire 1. , can absorb the thrust force within the arrangement that occurs due to sudden changes in the +L2 ki royal force, and the
It was possible to completely eliminate the thrust force acting on the connection with the raw equipment.

In addition, since the blow-off valve is placed vertically on the vertical piping at the connection between the discharge pipe and the regenerator, the jet reaction force generated during combustion air release can be completely absorbed by the spring hanger, and it is possible to completely absorb the jet reaction force generated when the combustion air is released. The speed of the gas turbine can be safely controlled, and operational reliability can be greatly improved.

A steam injection nozzle is installed at the 111 condensation connection between the return pipe and the regenerator to the east, and a steam injection nozzle is installed between the condensate that collects in the U-shaped 7-hole pipe to prevent vibrations caused by the condensate. 7 was achieved by eliminating the problems of corrosion and erosion, and greatly improving the reliability of the piping system.

In this way, problems such as external force caused by thermal expansion of the piping system, intermittent noise caused by vibration, intermittent noise caused by sudden changes in combustion air pressure, operation during emergency shutdown, and problems caused by drain noise can be solved. This has the effect of making it possible to downsize and reduce the weight of a regenerative gas turbine cycle engine.

[Brief explanation of drawings]

1 and 2 show a conventional example; FIG. 1 is a front view of a regenerative cycle gas turbine, and FIG. 2 is a plan view of FIG. 1. 3 to 7 show one embodiment of the present invention, in which FIG. 3 is a plan view of a regenerative cycle gas turbine, FIG. 4 is a front view of FIG. 3, and FIG. FIG. Figure 6 shows a hinged expansion joint, in which (a) is a plan view and (b) is a longitudinal sectional view. Figure 7 is a front view showing the state when the return pipe undergoes thermal expansion. Fig. 8 and Fig. 9 are partially enlarged views of a conventional arrangement a system, Fig. 8 is a partial longitudinal sectional view showing the combustor part, and Fig. 9 is a partial longitudinal sectional view showing the regenerator part. FIG. 10 is a vertical sectional view. FIGS. 10 and 11 are other embodiments of the present invention, and FIG. 10 is a partially enlarged front view of a discharge pipe provided with an air discharge valve; Fig. 11 is a horizontal view of a lifting platform provided with a steam injection nozzle. 11... Turbine body, 13... Compressor casing, 14
...Turbine casing, 15...Turbine intermediate casing, 18...Outer cylinder (combustor), 22...Regenerator, 2
4...Discharge pipe, 25...Return pipe, 26...Gimbaled expansion joint, 27...Hinged expansion joint, 28...
・Expansion joints published by Gimbal, 29・・・Hinge expansion joints,
38-43...Spring hanger, 44-46...
Hydraulic vibration isolator, 56...Air discharge valve, 62...Steam jet nozzle. Agent Patent Attorney Masami Akimoto 10 0 '11 Inn 2 Figure 86 1 Thousand 2 Figures Funeral 10 Figure Name 11 Figure

Claims (1)

[Claims] 1. In the combustion air piping system of the regeneration gas turbine cycle that connects the combustor and regenerator of the gas turbine, a hinged expansion joint is provided in the vertical part of the discharge pipe of the combustor, and two parts are provided in the horizontal part. a discharge pipe comprising a gimbaled expansion joint;
a return pipe comprising a hinged expansion joint in the vertical part of the return pipe of the combustor and two gimbaled expansion joints in the horizontal part; a spring hanger for supporting the weight of the discharge pipe and the return pipe; One end is fixed to the gimbaled expansion joint provided on the above discharge pipe and return pipe, and the other end is fixed to another fixed point.
, %-] An endogenous gas turbine cycle combustion air piping system consisting of a hydraulic vibration isolator for preventing vibrations of the discharge pipe and return pipe caused by forces, etc. 2. In the combustion air piping system of the regeneration gas turbine cycle that connects the gas turbine combustor and regenerator, a hinged expansion joint is installed on the vertical (navy) part of the combustor discharge pipe, and two gimbaled expansion joints are installed on the horizontal part. a discharge pipe provided with a joint; a return pipe provided with a hinged expansion joint in the vertical part of the combustor return pipe and two gimbaled expansion joints in the horizontal part; One end is fixed to a spring hanger that supports its own weight, and a gimbaled expansion joint installed at the above-mentioned discharge pipe and return point, and the other end is fixed to another fixed point to prevent vibrations of the discharge pipe and return pipe caused by impact force, etc. This gas turbine cycle combustion air piping system consists of a hydraulic vibration isolator to prevent vibrations, and a blow-off valve installed vertically above the vertical piping at the connection between the regenerator and the discharge pipe. 3. In the combustion air piping system of the regeneration gas turbine cycle that connects the combustor and regenerator of the gas turbine, a hinged expansion joint is installed in the vertical part of the combustor discharge pipe, and two gimbaled expansion joints are installed in the horizontal part. a discharge pipe comprising;
a return pipe comprising a hinged expansion joint in the vertical part of the return pipe of the combustor and two gimbaled expansion joints in the horizontal part; a spring hanger for supporting the weight of the discharge pipe and the return pipe; One end is fixed to the gimbaled expansion joint provided on the above-mentioned discharge head and return pipe, and the other end is fixed to another fixed point to provide hydraulic vibration isolation to completely prevent vibrations of the discharge head and return pipe caused by impact forces, etc. FL1-raw gas turbine cycle combustion nitrogen gas distribution N system consisting of a nozzle installed at the mouth of the regenerator 1 and injecting steam into the return pipe.