JPH056476Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a high-rate confluence pipe for geothermal fluid, which reduces the pressure drop of geothermal fluid during confluence and utilizes the suction effect of the ejector function. Moreover, it has a structure that is easy to manufacture.

Conventional Technology Electricity generation using geothermal steam is being carried out as part of the utilization of energy sources that have become available in recent years. When generating electricity using geothermal heat in this way, approximately 100 tons of steam is required per hour to generate 10,000 kW of power, and generally 10 or even dozens of steam extraction wells are installed to generate electricity. Steam from the extraction wells is combined and supplied to the turbine.

As a conventional geothermal steam confluence pipe, JP-A-57-
Publication No. 9392, Publication No. 15832 of 1983, etc. have been proposed. The former is the second one that should be merged with the geothermal steam.
This is a confluence pipe structure in which a pipe is inserted through the wall of the first pipe and into the inside of the first pipe, and a double pipe is formed by the two pipes at the confluence part. A branch pipe for the geothermal fluids to be combined is passed through the upper pipe wall of the transport main pipe and inserted into the interior, and its tip is aligned with the pipe axis of the transport main pipe.

Problems to be Solved by the Present Invention In all of the conventional merging pipes mentioned above, the tips of the branch pipes to be merged are inserted into the interior of the transportation main pipe, and the tip of the inserted pipes is connected to the geothermal fluid. Although it is oriented in the flow direction, the tip of the pipe that is to be merged into the transport main pipe is protruded inside, so the passage area of the merge part is reduced and the flow on the main stream side is obstructed. The merging does not proceed smoothly due to pressure loss, and the discontinuous merging reduces the outflow amount on the main pipe side.

In addition, the pipes to be merged are inserted through the transport main, which is complicated to manufacture, and on the other hand, long-term use can cause vibrations due to the fluid pressure of the geothermal fluid flowing through the transport main. It may be damaged by fine particles of the earth's crust mixed in the fluid and ejected, and in extreme cases, there is a risk that the tip protruding inside may be damaged.

The object of the present invention is to improve the drawbacks of the conventional merging pipes mentioned above, to provide a high rate merging pipe for geothermal fluids that can reduce the pressure loss of geothermal fluid, is easy to manufacture, and can be used for a long period of time.

Means for Solving the Problems The present invention is a system in which geothermal fluid ejected from a group of geothermal wells is merged into a main transport pipe. , on the other hand, is a high-rate geothermal fluid confluence pipe in which an inclined inlet pipe whose tip is inclined in the flow direction of the geothermal fluid flowing through the horizontal nozzle is attached to the outer wall surface of the pipe shell.

Function The present invention is constructed as described above, and when installed at the confluence section, the tube shell communicates with the horizontal nozzle pipe and the main transport conduit, and is installed horizontally. The flange-fixed horizontal nozzle pipe inserted into the tube shell is inserted through the flange tip of the tube shell, and the fluid outlet portion of the horizontal nozzle tube extends slightly from the inclined inflow pipe outlet portion of the tube shell. It is something to be installed.

Moreover, the inclination angle of the above-mentioned inclined inflow pipe is 45° ~
It is appropriately selected in the range of 75° depending on the combined flow rate, pressure, and gas-liquid ratio in the two-phase flow.

In order to prevent the horizontal nozzle pipe inserted into the tube shell from wobbling caused by disturbance during the merging of geothermal fluids, it is preferable to guide and support the horizontal nozzle pipe by means of anti-sway hardware.

In the present invention, at the outlet junction of the inclined inflow pipe,
The geothermal fluid flowing in the horizontal nozzle pipe is jetted from the tip of the nozzle pipe, while the geothermal fluid jetted from the inclined inflow pipe is smoothly divided along the outer circumferential surface of the neck of the nozzle pipe tip and enters the merging area. .

Furthermore, the fluid jetted from the horizontal nozzle port exerts a suction effect due to the ejector function, which also has the effect of smoothly merging the gas-liquid two-phase fluid entering the merging region from the inclined inlet port.

In addition, the hydrothermal liquid film at the inclined inlet pipe mouth caused by the pipe wall liquid film in the annular basin of the two-phase geothermal fluid flowing through the main transport conduit exerts an inflow suppressing effect, making it difficult to merge. However, with the horizontal nozzle pipe system, this problem is completely resolved and the pressure drop is significantly reduced, resulting in a high rate of merging.

In addition, in the present invention, the tube shell of the merging tube is manufactured to have an appropriate length considering the installation part of the horizontal nozzle tube, and the inclined inflow tube is joined to the outer wall surface of the tube shell in a branched manner.

Therefore, the manufacturing structure of the merging pipe section is simple and has excellent on-site workability.

In addition, in the present invention, since the inclined inflow pipe of the fluid to be merged does not exist in the flow of geothermal fluid flowing through the horizontal nozzle pipe, the fluid pressure of the geothermal fluid or the eruption of the earth's crust mixed in the fluid Since there is no impact from crushed debris, etc., the inclined inlet pipe can be used for a long period of time without wear or breakage.

As described above, in the present invention, the horizontal nozzle tube jacket before merging is used as a tube shell to communicate with the main transport conduit at the merging section.

In the transport pipe system, where merging is performed in stages, the main transport pipe and horizontal nozzle pipe are connected at the next merging point, and continuous high-rate merging is made possible by repeating the merging function using the same structure.

The adoption of this method has made it possible to realize a highly efficient centralized transportation of geothermal fluids, and has brought about significant economic benefits in terms of transportation costs and construction costs due to easier design and construction.

Embodiment FIG. 1 shows an embodiment of the present invention. Next, the present invention will be specifically explained with reference to an illustrated example.

A flange 2 is attached to the tip of a tube shell 1 having an inclined inflow tube structure, and a horizontal nozzle tube 3 is inserted from the flanged tip of the tube shell 1.

When the lid flange 4 fixed to the outer surface of the horizontal nozzle pipe 3 and the flange flange 2 are connected and fixed, the horizontal nozzle pipe 3 is placed on the same axis as the tube shell 1.

On the other hand, an inclined inflow pipe 5 is provided on the outer wall surface of the tube shell 1.
are attached so as to be inclined toward the fluid flow direction on the upstream side of the tube shell 1, and are connected in a branched manner.

As shown in FIG. 2, a plurality of anti-shake hardware 6 are attached to two locations on the outer peripheral surface of the horizontal nozzle pipe 3 inserted into the tube shell 1, respectively, and the anti-shake hardware 6 is attached to the outer peripheral surface of the horizontal nozzle pipe 3 inserted into the tube shell 1. 1 is fixed to the circumferential surface of the inner wall, and guides and supports the deflection of the horizontal nozzle pipe 3.

Note that the reference numeral 7 in FIG. 3 is a fixing rib of the lid flange 4 that is integrated with the horizontal nozzle pipe 3.

In Fig. 1, the geothermal fluid is flowing in the direction of the arrow through the horizontal nozzle pipe 3, and the geothermal fluid to be combined with the geothermal fluid flows from the inclined inflow pipe 5 in the direction of the dotted arrow, and the geothermal fluid is flowing through the horizontal nozzle pipe 3 in the direction of the dotted line arrow. They are merged within shell 1.

The geothermal fluid flowing in the horizontal nozzle pipe 3 is jetted from the tip of the horizontal nozzle pipe 3, and the other side is the inclined inflow pipe 5.
The geothermal fluid supplied from the horizontal nozzle pipe 3 smoothly merges along the outer circumferential surface of the distal neck portion of the horizontal nozzle pipe 3 and enters the merging area.

In this case, since the tip of the horizontal nozzle pipe 3 is attached in a slightly extending state beyond the inlet of the inclined inflow pipe 5, a hydrothermal liquid film of the geothermal fluid flowing inside the horizontal nozzle pipe 3 at the confluence part Since there is no suppressing effect and therefore no flow resistance, pressure loss is significantly reduced.

On the other hand, the geothermal fluid flowing through the horizontal nozzle pipe 3 is not affected by the liquid film blocking of the fluid flowing in from the inclined inflow pipe 5, so there is no risk of pressure loss, and furthermore, the geothermal fluid mixed in the geothermal fluid It can be used for a long time without fear of impact from crushed debris.

The geothermal fluid that has been merged as described above is sent through the tube shell 1 having the structure with an inclined inflow pipe, which is connected to the main transport conduit, and when further merging the geothermal fluid therewith, the exact same method as described above is repeated. This allows for sequential merging, which simplifies the design and construction of the main transport conduit.

Effects of the invention As described above, this invention is effective in merging geothermal fluids.
A horizontal nozzle pipe is inserted into a tube shell with an inclined inflow tube structure, and the geothermal fluid to be merged flows in from the inclined inflow tube attached to the outer wall of the tube shell, so the pressure drop of the geothermal fluid can be reduced. By being able to significantly reduce this, high-efficiency merging is possible, and
The structure of the confluence pipe section is simple and easy to manufacture and construct on-site, and the design and construction of the main transport conduit can be made simple and easy, resulting in great economic effects.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a sectional view taken along the line - in Fig. 1, and Fig. 3 is a sectional view taken along the line - in Fig. 1.
FIG. 1... Tube shell, 2... Flange, 3... Horizontal nozzle pipe, 4... Lid flange, 5... Inclined inflow pipe, 6
... Steady prevention hardware, 7... Fixed rib.

Claims (1)

[Scope of utility model registration request] In a method of merging geothermal fluid ejected from multiple geothermal wells into a main transport pipe, it consists of a pipe shell with a horizontal nozzle of the same diameter that communicates with the main transport pipe, and on the other hand, a horizontal nozzle with a horizontal tip on the outer wall surface of the pipe shell. A high rate confluence pipe for geothermal fluid, characterized in that an inclined pipe is installed to be positioned and inclined in the flow direction of the geothermal fluid flowing through the nozzle.