JPS63186922A - Branching selector valve for gas - Google Patents

Abstract

PURPOSE:To reduce the installation space for a branched part and permit the compact arrangement by forming the three dimensional structure of the branched part of a gas duct by forming an inlet and two outlets and installing a selector valve which selects one direction among the outlets in two directions in the branched part. CONSTITUTION:When a selector valve body 4 is in the horizontal state, the gas supplied from all inlet duct 1 flows i!1 a horizontal outlet duct 2, curved horizontally, and an upper outlet duct 3 is closed by the selector valve body 4. In this state, the selector valve body 4 is turned by 90 deg. around a selector valve shaft 5, and when set in the vertical state, the horizontal outlet duct 2 is closed. and the gas introduced from the inlet duct 1 flows upwardly, and discharged from the upper outlet duct 3. With such constitution that the inlet duct 1 and outlet ducts 2 and 3 are branched in three dimensional directions and the selector valve body 4 is incorporated at the branched point, the whole structure can be made compact.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switching valve for the branching direction of a gas passage and the gas flow direction, and is particularly applicable to a gas duct of a combined cycle plant that transfers a large amount of gas. This invention relates to a suitable switching valve.

[Conventional technology]

In a combined cycle plant, as shown in FIG. 4, exhaust gas from a gas turbine 9 is passed through an exhaust heat recovery boiler 11 to recover heat and then released into the atmosphere.

The exhaust heat recovery boiler 11 supplies water and recovers heat from the gas turbine exhaust gas to produce steam, which is used in a steam turbine or the like. A branch part 12 is provided between the gas turbine 9 and the exhaust heat recovery boiler 11, and when the exhaust heat recovery boiler 11 is temporarily stopped, the stack 16 is released into the atmosphere or the exhaust heat recovery boiler of another system (Fig. (not shown), and enables continuous power generation without stopping the gas turbine 9.

Branches in conventional gas ducts are Metro, Flex, Information Sheet No.

17280, Figure 15, Changeover Flap Isolator (METRO-FLEX, INFOR)
MATION 5HEET & 17280, Fig,
15. Changsover Flap l5ola
tor).

and as shown in Figures 3(a) and 3(b), in a two-dimensional T-shaped branch, the two outlets are one, for example, one straight outlet and one right-angled bend (up or side) for a horizontal inlet. ) It had a shape with an exit. Also.

The switching valve for selecting the gas outlet direction installed at the branch part is
As shown in Figure 3(b), one valve is provided for each of the two outlets and an interlock is provided to prevent both from closing at the same time, or one valve is installed as shown in Figure 15 of the above-mentioned document. The valve body is shared by both outlets.

[Problem that the invention seeks to solve]

In the above conventional technology, one branch is two-dimensional.

For example, in the case of an arrangement where the branch inlet is branched into an upper stack and a side exhaust heat recovery boiler, an elbow space is required in addition to the first branch and the switching valve (see Figure 5 (a)). When adding an exhaust heat recovery boiler to a gas turbine plant, there was a problem in that it was impossible to install it due to limited space.

The purpose of the present invention is to minimize the installation space of the branch part, enable compact arrangement, reduce cost, and reduce fluid pressure loss when the branch part and switching valve are applied. The purpose of the present invention is to provide a switching valve.

[Means for solving problems]

The above object is achieved by three-dimensionally configuring the directions of the inlet and two outlets of the branch and incorporating one valve body therein. That is, as shown in Fig. 1, two outlets are arranged upward and sideways relative to the horizontal inlet, and a valve body with a shaft is built into the ridge line inside the intersection of the upward duct and the sideways duct. Therefore, only either the upward duct or the sideways duct can be closed.

In addition, as a measure to reduce fluid oil loss due to corner bending, a rectifying plate is attached to one or both sides of the valve body, as shown in FIGS. 2(a) and 2(b).

[Effect]

As shown in Figure 1, the branch part has the intersection of the inlet and two outlets at one point, so there is no need for a transverse reel valve, and the valve body is built into it, so it is compact. The installation space is minimized, and when the upward duct is closed, the horizontal duct is always opened, and conversely, when the horizontal duct is closed, the upward duct is opened. (The structure is such that abnormal pressure increases due to simultaneous closure of both outlets are impossible, so malfunctions are unlikely.)

When attaching a current plate to the valve body, please refer to Figure 2 (a) and Figure 2.
As shown in Figure (b), no matter which outlet is closed, a rectifying plate curved in a direction to rectify the flow is attached to the surface of the valve body on the side that becomes the passage. That is, when the upward duct is closed, the lower surface of the valve body is curved from the inlet to the side, and when the horizontal duct is closed, the valve body is curved upward from the inlet to the inlet side. By attaching current plates to both sides of the valve body to act as current plates, and making the current plate fit within a three-dimensional area that avoids contact with the inner surface of the duct during switching, it is not used when used in either direction. The rectifying plate on the side fits into the duct on the unused side, so there is no negative effect.

Further, the current plate may be attached only to one important side.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows the switching valve of the present invention. Gas coming from the inlet duct 1 bends horizontally and flows into the output duct 2 when the switching valve body 4 is horizontal as shown in the figure. The ball duct 3 is closed by a switching valve body 4. On the other hand, when the switching valve body 4 is rotated 90 degrees around the switching valve valve #5 and made vertical (as shown by the two-dot chain line in Fig. 1), the exit rod 2 is closed and the inlet duct 1 The gas that enters bends upward and flows to the bead rod duct 3. Therefore, the inlet, side outlet, and bead rod ducts 1 to 3 all branch out from one point in a three-dimensional direction, and are further switched to that branch point. Since the valve body 4 is incorporated, it is in a compact state in which both the branch and switching valves are housed in one body.

Next, an embodiment in which the switching valve of the present invention is applied to a combined cycle plant will be described.

Figure 4 shows the system of a combined cycle plant.
Air entering from the air intake 14 is compressed by the compressor 8 and combusted in the combustor 13 together with fuel entering from the fuel inlet 15 to drive the gas turbine 9.

It serves as the power for the generator 10. On the other hand, the exhaust gas from the gas turbine 9 passes through the branch section 12 and enters the exhaust heat recovery boiler 11, where the heat is recovered and released into the atmosphere from the stack 17. The exhaust heat recovery boiler 11 heats the water supplied from the water supply inlet 18 with exhaust gas, produces steam from the steam outlet 19, and uses the steam for power generation by a steam turbine (not shown).

On the other hand, in the first branch part 12, a duct branches to a stack 16. Normally, the stack 16 is closed, but when the exhaust heat recovery boiler 11 is temporarily stopped for maintenance inspection, etc., the exhaust heat recovery boiler 11 is closed. is closed, and the stack 16 is opened to release the exhaust gas into the atmosphere.

Continuous operation of the gas turbine 9 is enabled and power generation stoppage is avoided. That is, a switching valve is provided so that two outlets can be selected, and this is a suitable location for using the switching valve.

In the conventional example, the branching portion 12 is as shown in FIG. 3(a) or FIG.
It is constructed as shown in b), and the inlet duct 1 and the direct outlet duct 2' are connected in a straight line, and the ball duct branches at the top, and in the example shown in Fig. 4, they are connected to the waste heat recovery boiler 11 and the stack 16, respectively. There is.

Figure 5(a) shows the 3rd g! FIG. 4 is a plan view showing a case where the conventional branch section of II (a) is applied to the branch section 12 of FIG. 4.

FIG. 5(b) shows the switching valve and branch part according to the present invention in the fourth embodiment.
A plan layout diagram when applied to the branch section 12 in the figure is shown.

As is clear from the comparison between Figures 5(a) and (b),
In Figure (b), the elbow 2o is not required and the installation space can be significantly reduced, and the distance between the axial centers of the gas turbine 9 and the generator 1o and the center of the exhaust heat recovery boiler 11 is 5, for example.
If the width of the duct is about 3 m, the distance will be reduced by 6 to 8 m.

Therefore, there are effects such as a reduction in installation space and a reduction in manufacturing costs and installation costs due to a reduction in duct length.

In this embodiment, if the switching valve body 4 with the rectifying plate 6 or 6' shown in FIGS. 2(a) and 2(b) is used, it is effective to reduce the pressure loss at the gas bend. This is effective in improving plant performance by reducing pressure loss at bends.

Furthermore, when a current plate is attached to a switching valve, pressure loss of fluid flowing through a branch can be reduced, thereby improving plant performance.

〔Effect of the invention〕

According to the present invention, since the switching valve is built into the three-dimensional branch, the installation space can be reduced, and the manufacturing cost and installation cost for combining the branch and the switching valve can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the present invention, FIG. Figure 2 (b) is a perspective view showing a white top state, Figure 3 (a) is a sectional view of a conventional branch using a switching valve with one valve element, and Figure 3 (b) is a conventional branch. Fig. 4 is a system diagram of a combined cycle power generation plant with a gas turbine and steam plant, and Fig. 5(a) is a conceptual diagram of a conventional branch section using two gate valves.
Fig. 5(b) is a plan layout diagram of an embodiment of a combined cycle power plant using the configuration of a), and Fig. 5(a)
FIG. 2 is a plan layout diagram of an embodiment of a combined cycle power plant to which the configuration of the branch section shown in FIG. 1 according to the present invention is applied. 1... Inlet duct, 2... Outlet duct, 3...
Upper exit Figure 1 Figure 20 First (b

Claims (1)

[Claims] 1. The direction of the inlet and the two outlets of the branch part of the duct for transferring gas are mutually branched in three-dimensional directions, and one of the two outlet directions is selected for the branch part. 1. A gas branch switching valve, characterized in that the switching valve is comprised of one valve stem and one valve body. 2. The gas branch switching valve according to claim 1, characterized in that a rectifying plate is attached to one or both sides of the valve body.