JPS605762B2 - Hot water production method and device in hydrothermal geothermal power generation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for creating overflow in a hydrothermal geothermal power generation system.

As is well known, in a hydrothermal geothermal power generation system, geothermal fluid (a two-phase fluid consisting of steam and hot water) collected from an underground geothermal reservoir is supplied to a steam-water separator to convert it into steam and hot water. The separated steam is connected to a turbine to generate electricity, and the separated hot water is returned to the geothermal reservoir.

Normally, in this system, when the separated hot water is reduced, this hot water is led to a silencer for one day and released to atmospheric pressure (the same hot water is naturally supplied to the turbine). The hot water under atmospheric pressure is then supplied to the hot water measuring tank. The amount of reinjection is measured every hour, and a predetermined amount of this hot water is injected into the reinjection well. By the way, in this type of hydrothermal geothermal power generation system, ``When considering the utilization rate of the thermal energy possessed by the geothermal fluid, only the thermal energy of the steam separated by the steam water separator is used for power generation; Although water has a considerable amount of thermal energy, it is inconveniently not utilized.Incidentally, in hot water type geothermal power generation systems conventionally installed in Japan, when the thermal energy of the geothermal fluid is taken as 100%, the turbine The thermal energy of the supplied steam is approximately 54% (
Approximately 65% of the thermal energy is converted into electricity), approximately 46% of the thermal energy of the hot water supplied to the silencer (approximately 11% of the thermal energy is converted into steam from the silencer and released into the atmosphere, and The thermal energy of hot water that is reduced to , etc. is approximately 35%). However, due to the above-mentioned background, in recent years, in order to make effective use of the collected geothermal fluid, hot water discharged from silencers has been used as hot springs,
Attempts are being made to use it for district heating, greenhouse horticulture, tourism, etc. However, hot water collected from underground contains a large amount of silica, the main component of scale, which is the biggest obstacle for hot water transport pipes and heat exchangers. Contains phosphorus, which is subject to strict regulations under emission standards and environmental standards. Means for removing these silica and phosphorus are still in the research stage, and no effective and appropriate means have been provided. Therefore, with regard to the use of the above-mentioned hot water, there is still a problem that various inconveniences are caused due to the components contained in the hot water. In addition, when hot water is used for the above purposes, the temperature of the hot water is lowered in a heat exchanger and then returned to the reinjection well.
There are problems such as clogging of reinjection wells, shortening the lifespan of the reinjection wells, and having an adverse effect on geothermal reservoirs. In view of the above circumstances, this invention is a thermal k-type geothermal power generation system that makes it possible to effectively utilize the thermal energy of geothermal fluid collected from production wells that is not particularly used for power generation without causing the above-mentioned problems. The present invention provides a method and apparatus for producing hot water, characterized in that steam generated inside a silencer is used to produce hot water.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a geothermal power generation system equipped with a device for carrying out the method of the present invention. It is supplied to the air-water separator 5 through the interposed feed pipe 4, and in the air-water separator 5,
Separated into steam and hot water.

The steam obtained in the steam separator 5 is supplied to a turbine (not shown) through a feed pipe 6, and drives the turbine to generate electricity. In addition, the heat K'ma obtained in the steam-water separator 5,
After passing through the water collection tank 7, the water passes through the feed pipe 9 in which the labure disc 8 is inserted, the feed pipe 11 in which the orifice 10 is inserted, and then the feed pipe 13 in which the valve 12 is inserted.
is supplied to the silencer 14 through. Furthermore, the geothermal fluid passing through the pre-contract feed pipe 4 is supplied to the steam/water separator 5, and when power generation is to be stopped, it is supplied to the silencer 14 through the feed pipe 16 in which a valve 15 is inserted. . The silencer 14 introduces the hot water supplied from the feed pipe 13 and the geothermal fluid supplied from the feed pipe 16 into the hollow portion 14a, and releases them to atmospheric pressure in the hollow portion 14a. In this case, the hollow part 14a of the silencer 14
is connected to the outside air via an exhaust pipe 17 (open square part) connected to the top of the silencer 14 so that this part is under atmospheric pressure. At this time, a butterfly valve 18 is attached to the upper end of the exhaust pipe 17, and by operating this butterfly valve 18, the amount of entrance of the exhaust pipe 17 into the outside air can be adjusted. Note that the hollow portion 14a has a sufficient volume so that the pressure in this portion does not fall below a predetermined pressure even when a large amount of hot water or geothermal fluid under high pressure is supplied to this portion. The hot water and geothermal fluid introduced into the hollow part 14a of the silencer 14 are exposed to atmospheric pressure. As a result, a large amount of steam is generated in the hollow part 14a (heat K
(The geothermal fluid is further separated into steam and hot water), and this steam is discharged from the exhaust pipe 17 into the outside air at a flow rate regulated by a butterfly valve 18, while being supplied to an air supply pipe to be described later. Further, the hot water placed under atmospheric pressure in the hollow portion 14a is supplied from the lower end of the silencer 14 into the hot water measuring tank 22 through the feed pipe 21 in which the valve 20 is inserted. The flow rate of the hot water introduced into the hot water measuring tank 22 is measured every hour in the tank 22, and a predetermined amount is injected into the reinjection well 24 via the feed pipe 23. In the above system, a hot water production device having the following configuration is provided in order to produce hot water using the steam generated in the silencer 14.

That is, one end of an air supply pipe 25 is connected to the lower end of the exhaust pipe 17, and the other end of the air supply pipe 25 is connected to an overflowing tower 26 provided at a predetermined distance from the silencer 14.
'This is connected. The steam obtained by the silencer 14 is fed to the air pipe 25 at a flow rate adjusted by the butterfly valve 18, and is supplied from the air pipe 25 to the hot water production tower 26. In this case, the air supply pipe 25 has a sufficient inner diameter so as not to increase the pressure in the hollow part 14a depending on the adjustment position of the butterfly valve 18.
Consideration has been given to curving it in the direction of 4a. Hot water creation tower 2
6 produces hot water using steam supplied from the air pipe 25 and fresh water supplied from the fresh water pipe 27, and its detailed structure is as shown in FIG. That is, as shown in the figure, the hot water generation tower 26 has a cylindrical main wall 2.
In a case 31 whose upper and lower ends are closed by a husband plate 29 and a bottom plate 30, water sprinkling plates 32, 33, and 34 having a large number of small holes are arranged sequentially downward from the upper end of the case 31 (Fig. (Only the small holes 35, 35 of the water sprinkling plate 32 are shown), and the upper surfaces of the water sprinkling plates 33, 34 are equipped with lahishir rings 36, 37 made of a large number of polyethylene pipes (not shown) cut into short lengths. It is made by loading, and the husband board 29
The end of the fresh water pipe 27 is connected to the center of the main wall 29, and a non-condensable gas discharge pipe 38 is provided on one side of the main wall 29, and the other end of the air supply pipe 25 is connected to the lower end of the main wall 28. and one end of the incisional tube 39 is connected. At this time, in the above configuration, the main wall portion 28 of the case 31 usually has a lid 4.
A hole 41 is formed which is closed by a hole 41, and scale attached to the lachish rings 36, 37 can be removed through this hole 41. On the other hand, the other end of the pre-consignment hot water pipe 39 is connected to the hot water collection tank 42 . In addition,
The fresh water pipe 27 is equipped with a flow rate device control valve 42 and a flow meter 4.
3 is inserted, and a valve 44 is inserted into the preconsignment wound canal 39.
is inserted. When creating hot water with the hot water creation device having the above configuration, first, the flow rate adjustment valve 4
2 and adjust the water depth to match the required amount of hot water.
7 to the hot water creation tower 26.

Also, adjust the butterfly valve 18 and silencer 1.
A predetermined amount of the steam generated in the hot water generating tower 26 is supplied to the hot water generating tower 26 through the air pipe 25. The fresh water supplied into the hot water creation tower 26 is sprayed from its upper end and dripped over the entire area inside the case 31 through the small holes 35, 35... of the water sprinkling plate 32,
Lahisi ring 36, watering board 33 and Lahisi ring 37
The water is dripped through the water sprinkling plate 34. On the other hand, hot water creation tower 2
The steam discharged into the container 6 rises from the lower end of the case 31 through the sprinkler plate 34 and the spray ring 37 and the sprinkler plate 33 and the spray ring 36. In this case, the steam introduced into the case 31 is introduced so that the steam circulates around the circumference of the case 31, and is uniformly diffused within the case 31. In the case 31, the dripping clean water and the rising steam are mixed and heat exchange occurs between them, and furthermore, the substances contained in the steam (for example, Na, C, etc.) are mixed.
a, Mg, CI, etc.) are dissolved in fresh water. At this time, the non-condensable gas such as the ratio S contained in the steam is released into the atmosphere through the non-condensable gas discharge pipe 38. In this way, hot water is obtained at the lower end of the case 31, and this hot water is collected in the flaw collecting tank 42 through the hot water pipe 39. The hot water thus obtained contains appropriate amounts of Na, Ca, and M as its components.
Since it contains Ng, CI, etc., it can be used as it is or mixed with the hot water collected in the hot water measuring tank 22 (N
A, Ca, Mg, CI, etc. are present in a small amount)) It can be used as a hot spring. In addition, this hot water contains only a small amount of the above-mentioned components when compared to the above-mentioned hot water, so it can be used as is for district heating, greenhouse horticulture, etc. As is clear from the above description, according to the present invention, in a hydrothermal geothermal power generation system, hot water is created using steam that was conventionally released into the atmosphere from a silencer.
While it is possible to effectively utilize the thermal energy of geothermal fluid using existing equipment, it is also possible to suppress the amount of steam emitted from the silencer to a small extent, thereby preventing harm caused by the steam, such as when the steam attaches to trees and kills them. It has the effect of preventing damage such as water leakage, and providing overflow suitable for uses such as hot springs, district heating, and greenhouse horticulture with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a hydrothermal geothermal power generation system equipped with a device for carrying out the method of the present invention, and FIG. 2 is a perspective view showing details of the hot water production tower shown in FIG. 14... Silencer, 17... Sekiguchi part (exhaust pipe) Volume 8 skin... Butterfly valve, 25... Air pipe " 26... Hot water production tower. Figure 1, Figure 2 figure

Claims (1)

[Claims] 1. A hydrothermal geothermal system in which geothermal fluid collected from a production well is separated into steam and hot water, and the resulting steam is used to generate electricity and the hot water is supplied to a silencer for treatment. In the power generation system, steam is generated inside the silencer under atmospheric pressure, the steam generated inside the silencer is sent out from the silencer, and the sent steam is mixed with fresh water. hot water generation system in a hydrothermal geothermal power generation system, characterized in that the amount of steam mixed with the fresh water is adjusted by adjusting the amount of steam released into the atmosphere from the silencer. Method. 2. In a hydrothermal geothermal power generation system in which geothermal fluid collected from a production well is separated into steam and hot water, the resulting steam is used to generate electricity, and the hot water is supplied to a silencer for treatment. An opening is provided to communicate the inside of the silencer with the atmosphere, and one end of the air pipe for extracting the steam generated inside the silencer is connected to the silencer, and the other end of the air pipe is connected to the hot water production tower. , a valve is provided in the opening to adjust the amount of steam generated inside the silencer released into the outside air through the opening and to adjust the amount of steam to be fed to the hot water production tower; A hot water generation device in a hot water type geothermal power generation system, characterized in that hot water is created by mixing steam and fresh water supplied from the air pipe in a hot water generation tower.