JPH0220563Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flasher device for efficiently generating steam from hot water in a geothermal power generation plant or the like that generates electricity using geothermal heat.

Geothermal power generation involves extracting steam and hot water from underground wells and guiding them to a power generation plant to generate electricity.There are various power generation methods using geothermal heat, one of which is the mixed pressure turbine. There is power generation by this method. In this method, steam (referred to as primary steam) ejected from a well is supplied to a high-pressure turbine stage, and a large amount of accompanying hot water is flashed by a low-pressure flashing effect and recovered as clean secondary steam. This method supplies the recovered steam to the low-pressure stage of the turbine, and is a hydrothermal-dominated power generation method that is already commonly used.

However, recovery of the clean secondary steam
The problem is not simply by flushing hot water under low pressure, but how to efficiently recover clean secondary steam with few harmful impurities.

If the recovered steam is wet steam with a high content of harmful components and liquid, the turbine efficiency will be reduced due to silica scale caused by components such as silica adhering to the turbine blades and resistance caused by droplet splashes. Therefore, in order to increase the efficiency of the turbine and the operating rate of the entire power plant, it is necessary to separate the gas and liquid from the hot steam from the geothermal well using a high-performance flasher device, increase the efficiency of steam generation, and improve the dryness of the steam. An important issue is the continuous and stable recovery of 99.9% or more clean steam.

The purpose of this invention is to improve the efficiency of steam generation from hot steam generated from wells in geothermal power generation plants, and to achieve a steam dryness of 99.9%.
The object of the present invention is to provide a flasher device that continuously and stably recovers the above-mentioned clean steam.

In conventional flushing equipment, the hot water jet is mainly caused to collide directly with the poles of the body plate or head plate of the cylindrical body, which causes the inertia during the collision, the collapse of steam bubbles, the particles of hot water, and the scale contained in the hot water. Due to various influences such as components, there are drawbacks such as pitting wear on the plate surface and deterioration of the material due to local fatigue, which affects the life of the flasher main body. In addition, in the conventional method, the droplets in the hot water are scattered all over the interior of the flashing device body due to the collision of the hot steam jets, so as a means to improve the dryness and other properties of the secondary steam, the volume of the body was made to be abnormally large. However, a method of reducing the flow rate of steam, providing a mist separator function with a wire mesh structure at the steam outlet, or installing a separate mist separator device is required. However, these methods have problems in that pressure loss becomes large, which adversely affects flashing efficiency and in terms of equipment economy. Furthermore, the hot water vapor jet causes large undulating waves on the hot water surface inside the fuselage after flashing, and the hot water mist is remixed into the steam due to the entrainment phenomenon.
Another drawback was that it made it difficult to accurately detect the water level inside the fuselage.

In view of the above-mentioned shortcomings of the conventional equipment, the present inventor prototyped a model with a specially devised device in the internal structure of the flashing equipment, and conducted field tests using separated hot water obtained from geothermal production wells. This is a high-performance flasher device that can stably and continuously recover clean steam with a purity higher than that of primary steam.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The flasher device according to the present invention will be described below with reference to FIG. FIG. 1 shows an embodiment of a flasher device according to the present invention, and FIG. 2 is a cross-sectional view taken along AA in FIG. In FIG. 1, the flasher device is a body of an integral structure in which both ends of a cylindrical body 1 are covered with head plates 2a and 2b, and the inside contains a flash expansion chamber 3a for hot water and a liquid contained in flash steam. It consists of a droplet sedimentation separation chamber 3b and a vapor recovery chamber 3c. Also, inside the body 1, a first punching plate 6a for separating droplets in the flash steam is provided.
A second punching plate 6a' is located at the entrance of the settling chamber 3b, and a third punching plate 6b is located at the entrance of the sedimentation separation chamber 3b.
A fourth punching plate 6b' is attached to the outlet of the sedimentation separation chamber 3b in series and at appropriate intervals.

Insertion type hot water inlet nozzles 7a and 7b are installed in the upper part of the hot water flash expansion chamber 3a, and insert type hot water inlet nozzles 7a and 7b are installed in the upper part of the flash expansion chamber 3a.
A hot water outlet nozzle 9a is attached to discharge hot water separated within the body (referred to as secondary hot water) to the outside of the body 1. 11 represents the liquid level of hot water. Although there are two hot water inlet nozzles 7a and 7b in this embodiment, the required number may be installed depending on the equipment. Further, directly below the hot water inlet nozzles 7a and 7b, an inclined baffle plate 4 and a rectifying plate 5 are installed on the flow path side of the flash steam. The inclined baffle plate 4 is provided directly below the hot water inlet nozzles 7a and 7b so that the high-speed jet of the hot water flushing fluid does not directly hit the body 1 and the mirror plate 2a.
By tilting the flush plate 4 toward the end plate 2a side, it has the effect of relaxing the collision energy of the high-speed jet and breaking the jet into gas by the collision, and converting the flushing fluid into hot water and steam. improves the efficiency of separation. In addition, by tilting the full plate 4 toward the end plate 2a, there is an effect that the hot water scattering direction is opposite to the steam recovery side, and this is designed to make the fuselage 1 as short as possible. ing.

Further, inside the flash expansion chamber 3a, there is a flash expansion chamber 3 as shown in FIG. 2 at the position shown in FIG.
A rectifier plate 5 with an opening at the center of the body on the steam flow path side is provided to prevent the hot water separated in step a from flowing into the sedimentation separation chamber 3b and the steam recovery chamber 3c, and to collect the flash steam at the center of the body. When the flash steam passes through the openings of the rectifying plate 5, it is subjected to a drifting effect. At the bottom of the sedimentation separation chamber 3b, there is a hot water outlet nozzle 9b for discharging hot water separated from the flash steam to the outside of the body 1, and at the top of the steam recovery chamber 3c, there is a hot water outlet nozzle 9b for discharging the hot water separated from the flash steam to the outside of the body 1. A steam outlet nozzle 8 is attached to take out dry steam (referred to as secondary steam).

In the flushing device having the above configuration, in the flushing expansion chamber 3a, the flushing fluid introduced in a high-speed jet state from the hot water inlet nozzles 7a and 7b is forcibly collided with the inclined buffle plate 4 to break up the flushing fluid. The crushed steam is separated from the hot water. The separated hot water flows downward by gravity along the inclined surface of the inclined baffle plate 4, falls into the hot water pool 10 at the bottom of the flash expansion chamber 3a, and is discharged from the hot water outlet nozzle 9a. On the other hand, the flash steam that collides with the inclined baffle plate 4 and is separated from the flow of hot water vapor contains a large amount of hot water droplets scattered by the collision as mist, but the current plate 5
The flash vapor is collected at the center of the body 1 due to the drift effect of the fluid flow as it passes through, and is then guided to the first punching plate 6a. In the first and second punching plate parts 6a and 6a' arranged in series at appropriate intervals, flash steam accompanied by a large amount of hot water droplets is compressed by the squeezing action when it passes through the punching plates. The properties of the flash vapor are improved by the evaporation phenomenon and the liquid film separation caused by the collision of the hot water droplets with the wall surface of the punching plate due to the inertial force, and the substantially clean flash vapor is introduced into the sedimentation separation chamber 3b. The flash steam introduced into the sedimentation separation chamber 3b still contains hot water mist that has not been captured by the first and second punching plates 6a and 6a', but this mist is absorbed into the sedimentation separation chamber 3b. By reducing the flow rate at , it is separated from the flash vapor due to the natural sedimentation separation effect due to its own weight. On the other hand, the separated steam is passed through the third and fourth punching plates 6b and 6b' again,
Similar to the effects of the first and second punching plates 6a and 6a', the secondary steam is converted into clean secondary steam and sent to the steam collection chamber 3c. The secondary steam collected in the steam recovery chamber 3c is taken out of the flasher device through the steam outlet nozzle 8, and is supplied as a power source to turbine equipment (not shown) through a steam transport pipe connected to the steam outlet nozzle 8. be done.

In the present invention, in order to recover maximum secondary steam from hot water, punching plates 6a, 6
For a', 6b, and 6b', plates with holes arranged in a staggered manner on the entire surface or part of the plate are used, and the flow rate is set at 10~
20 m/sec, and the steam flow from each hole of each punching plate is made to interfere with each other, and the mounting position interval X-X' of the first and second punching plates 6a and 6a' is set to the first punching plate 6a.
Considering the eccentricity of the hole of the hole and the hole of the second punching plate 6a', multiply by (hole diameter of the punching plate) x (10 to 20), and also the third and fourth punching plates 6b and 6b'. It is desirable to arrange the interval Y-Y' using the same concept as described above. Furthermore, it is desirable that the size of the sedimentation separation chamber 3b be sufficiently large, but since the barrel becomes long, the size becomes large and economically undesirable, so the distance between the second punching plate 6a' and the third punching plate 6b is
X'Y is determined by considering the properties of the mist in the steam passing through the settling chamber 3b (steam flow rate in the body m/sec) x (1 sec to 2 sec), that is, the residence time in the settling chamber 3b is 1 to 2 sec. It is preferable that the diameter be at least the diameter of the trunk.

As mentioned above, the structure of the flasher device according to the present invention is extremely simple, so that the hot water in the hot water pool 10 below the flash expansion chamber 3a overflows the rectifying plate 5 into the sedimentation separation chamber 3b or the steam recovery chamber 3c. Even if it flows into the body, clean secondary steam can be recovered without affecting the flasher device in any way until the liquid level 11 of the liquid pool 10 in the body reaches a certain level.

In addition, the number of punching plates provided in the steam passage in the cylindrical body 1 is not limited to two on the upstream side and two on the downstream side as shown in this embodiment diagram, but two or more punching plates are provided within the range where resistance loss is allowed. As the number of sheets increases, the steam properties of the secondary steam become more perfect.

Further, in this embodiment, the fuselage 1 has been described as being of a cylindrical horizontal type, but it is not necessarily limited to this, and the fuselage 1 may be of a rigid type.

This flasher device is extremely useful as a device to separate and recover steam from hot water in geothermal power plants, etc., and can also be used to treat other two-phase fluids (fluid consisting of two phases of steam and hot water) from geothermal production wells. This device can also be installed in a device and used as a steam/water separation device.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a flasher device according to the present invention, and FIG. 2 is a sectional view taken along line A-A in FIG. 1...Body, 2a, 2b...End plate, 3a...Flush expansion chamber, 3b...Sedimentation separation chamber, 3c...
Steam recovery chamber, 4... Inclined buttful plate, 5
...straightening plate, 6a, 6a', 6b, 6b' ... punching plate, 7a, 7b ... hot water inlet nozzle,
8...Steam outlet nozzle, 9a, 9b...Hot water outlet nozzle.

Claims (1)

[Claims for Utility Model Registration] A flasher device for flushing hot water and separating it into steam and hot water, which device consists of a cylindrical body whose both ends are covered with mirror plates. A flash expansion chamber provided with an inlet and an outlet of the hot water, a droplet droplet settling separation chamber provided with a hot water outlet, and a steam recovery chamber provided with a steam outlet are divided in this order by a set of two punch plates. , Inside the flash expansion chamber, a buttful plate is installed directly below the hot water inlet and inclined toward the end plate, and the punch plate has holes arranged in a staggered manner on the entire surface or in part, so that the steam flow rate is set to 10. ~20
m/sec, and the distance between the mounting positions of the punch plates is 10 to 20 times the hole diameter.