JPH044999Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a scaling monitor for piping, etc. that leads geothermal hot water to a geothermal power generation plant.

[Conventional technology]

In the underground reduction of geothermal water containing scale, especially hot water used in geothermal plants, problems with clogging of reduction piping occur due to scale components contained in the hot water, such as SiO ₂ at low pressures and FeS at high pressures. Because this blockage affects the lifespan of reinjection wells, there is a need for a method to monitor the progress of scale in the field.

FIG. 4 is a schematic diagram showing a conventional example of a scaling monitor. As shown in FIG. 4, the conventional scaling monitor has a hot water inlet 21 and a hot water outlet 2.
A coupon 23 was installed in the piping 20 between the two.

Therefore, in order to measure the scaling rate due to scale components in the hot water in the pipe 20 through which geothermal hot water containing scale flows, a coupon 23 made of the same material as the pipe 20 is installed midway in the pipe 20 for a certain period of time. At the same time, the hot water is supplied to the hot water inlet 21 of the piping 20.
By flowing hot water from the hot water outlet 22 to the hot water outlet 22, scale adheres to the surface of the coupon 23 installed in the piping 20, forming a scale layer. In this way, the coupon 23 is placed inside the piping 20 through which the hot water passes for an arbitrary period of time.
After soaking, the coupons 23 were taken out from inside the piping 20, and the scaling rate inside the piping 20 was determined by measuring the weight increase of each coupon 23 and the thickness of the scale layer.

[Problem that the invention attempts to solve]

By the way, in the conventional scaling rate measurement method, after a coupon is immersed in a channel through which hot water passes for a certain period of time, the supply of hot water into the channel must be stopped every time the scaling rate is measured. , each time the hot water supply is interrupted, the salt content in the hot water, especially
There was a drawback that the scale layer increased due to the adhesion of NaCl. Therefore, it has not been possible to accurately monitor to what extent scaling is progressing in a flow path through which hot water containing scale passes at sites such as geothermal power plants.

Therefore, the present invention solves the above-mentioned conventional problems and provides a scaling monitor that can constantly monitor the scaling rate in the flow path through which hot water containing scale flows, regardless of the operating status of the geothermal plant, etc., simply and accurately. This is what we provide.

[Means for solving problems]

In this invention, a blank cell where scale does not adhere and a measurement cell with a coupon attached to which scale adheres are placed side by side in the flow path through which hot water containing scale passes, and light is passed through each cell. The thickness of the scale layer on the coupon surface of the measurement cell can be easily and accurately determined from the difference in the amount of cell passage without stopping the flow of hot water.

〔Example〕

1 to 3 are diagrams showing one embodiment of the present invention.

In this embodiment, a blank cell 5 made of glass without scale adhesion and a coupon made of the same material as the blank cell 5 are provided in the middle of a piping 3 through which hot water flows between a hot water inlet 1 and a hot water outlet 2. Measuring cell 6 with coupon 11 for scale attachment attached to rack 10
are arranged in parallel, and a light source 4 is placed on the side of each cell 5, 6.
Further, a blank cell light receiving section 7 and a measuring cell light receiving section 8 are arranged on the opposite side surface of each cell 5, 6, and the electrical signals of each light receiving section 7, 8 are displayed on a meter 9.

2 and 3 are cross-sectional views showing the cross-sectional state of the measurement cell 6. FIG. As shown in FIG. 2, the measuring cell 6 consists of a coupon rack 10 and a coupon 11. FIG. 3 is a cross-sectional view of the measurement cell 6 during the test, showing the state of scale 12 adhering to the surface of the coupon 11 inside the measurement cell 6.

In the scaling monitor configured as described above, hot water flows through the piping 3 from the hot water inlet 1 to the hot water outlet 2.
In the state where the flow is in operation, that is, in the operating state, there are blank cells 5 and coupon racks 10 in the pipe 3.
If a measurement cell 6 incorporating a coupon 11 is installed in the sensor, the scale 12 will adhere to the surface of the coupon 11 after a certain period of time, forming a scale layer.

Therefore, light is emitted from the light source 4, and the blank cell 5
and measurement cell 6. Therefore, within the measuring cell 6, the coupon 11 or the scale 1
Light passes through the gap between the two. So each cell 5,
The light that has passed through 6 reaches the blank cell light receiving section 7 and the measuring cell light receiving section 8, respectively, and is converted into an electrical signal. The light shielding ratio by the scale 12 in the measurement cell 6 is determined from the difference, and the meter 9 displays it.

Note that the meter 9 reading before the scale 12 occurs is obtained and used as a reference.

[Effect of idea]

According to the present invention, it is possible to easily monitor the scaling rate with high precision on-site at hot water reinjection wells, etc.
In addition, since the conventional problems can be solved, there is no need to stop the supply of hot water to the flow path every time scaling measurements are performed, so salt adhesion in the hot water can be prevented, etc. This invention contributes to the development of industry. However, it is large.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a scaling monitor that is an embodiment of the present invention, and FIGS. 2 and 3 are
FIG. 3 is a cross-sectional view inside a measurement cell. FIG. 4 is a conceptual diagram of a conventional scaling measuring section. 1... Hot water inlet, 2... Hot water outlet, 3... Piping, 4... Light source, 5... Blank cell, 6... Measurement cell, 7... Light receiving part for blank cell, 8... Measurement cell 9...meter, 10...coupon rack, 11...coupon, 12...scale.

Claims (1)

[Scope of utility model registration request] A blank cell that transmits light without scale adhesion in the middle of the flow path through which hot water containing scale passes, and a scale adhesion measurement cell in which a coupon for scale adhesion is placed in a cell made of the same material as the blank cell are placed side by side. In addition, a light projecting device and a light receiving device for measuring the amount of light transmitted are arranged at substantially symmetrical positions sandwiching each cell of the blank cell and the scale adhesion measuring cell. monitor.