JP2802457B2 - Wetness measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the wetness of steam flowing through a gas pipe. In various boilers and equipment using steam power, the dryness X or the wetness (1) indicating the content of moisture in the steam, that is, the ratio of the mass occupied by the dry saturated steam to the total mass per unit volume of the steam flow.
-X). This is because the enthalpy of the steam varies depending on the water content.

[0002]

2. Description of the Related Art Conventional steam wetness measuring devices include:
There is a squeezing dryness meter. In this method, the wet steam to be measured is jetted through a nozzle into a measuring vessel equipped with a thermometer and a pressure gauge, and is adiabatically expanded to make a superheated steam state to measure the wetness. Further, as another wetness measuring device, the wet steam to be measured is flown into the inner pipe of the double pipe, the same amount of superheated steam is flowed into the outer pipe, and the wet steam is heated by this superheated steam flow to become superheated steam. In some cases, the measured steam is sampled to measure the degree of wetness.

[0003]

In the former case,
There is a problem that the range of wet steam that can be measured is limited. That is, when the pressure of the steam is low, the pressure needs to be extremely low to make the superheated steam state in the vessel, and when the wetness of the steam is high, the steam does not become the superheated steam state after expansion. is there. In the latter case, the superheated steam is required as a heating source, and it is difficult to flow the same amount of superheated steam as the measured wet steam or to sample the measured wet steam. Therefore, a technical problem of the present invention is to make it possible to easily measure the wetness with a wide range of measurable wetness.

[0004]

Technical means of the present invention taken in order to solve the above technical problems SUMMARY OF THE INVENTION are arranged steam separator for separating water in the gas to the gas pipe, steam-water separator Vessel
Drain flow meter for measuring water content (W1) at drain
And measure the gas amount (W2) at the gas outlet of the steam-water separator
Either a flow meter is provided or the fluid flow (W
A flow meter for measuring 3) is provided, and the measured W1 and W2 are measured.
Or a calculation unit for calculating the wetness from W1 and W3 .

[0005]

The operation of the above technical means is as follows.
If a flow meter that measures the amount of fluid flowing through the gas pipe is provided at the inlet of the steam separator, the total flow rate of the gas containing water is measured, and the flow meter that measures the amount of fluid that flows through the gas pipe is used to measure When provided at the vapor outlet of the separator, the fluid amount of only gas is measured. The amount of water separated by the steam separator is measured by a drain flow meter. By calculating the ratio of the amount of water to the total flow rate by the calculation unit, the degree of wetness can be obtained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 to 4). Attach steam separator 2 to steam pipe 1. The steam separator 2 is provided with a steam outlet 3 and a drain outlet 4. The steam outlet 3 communicates with the inlet 6 of the steam flow meter 5, and the drain port 4 communicates with the inlet 8 of the drain flow meter 7.
Reference numeral 9 is an operation unit.

FIG. 2 shows an example of the steam separator 2. An inlet 11, a steam outlet 3, and a drain 4 are formed in the casing 10,
A cylindrical partition member 12 is attached in communication with the inlet 11,
An annular space 13 is formed between the casing 10 and the casing 10 surrounding the casing. A swirl vane 14 and a drainer 15 made of an inclined wall are arranged in an annular space 13. When the vapor to be measured flowing from the inlet 11 passes through the annular space 13, its direction is deflected by the swirling vanes 14 to be swirled, and since the water has a larger mass than the steam, it is squirted outward to surround the surrounding casing 10. It flows down along the inner wall and flows out from the drain 4. Light gas flows out of the steam outlet 3 through the central opening of the partition member 12. It should be noted that the steam-water separator is not limited to this swirl type, and any type can be used.

FIG. 3 shows an example of the drain flow meter 7. K
An inlet 8 and an outlet 17 are formed in the thing 16. A cup-shaped partition member 18 is arranged inside the casing 16.
The inside and the upper part of the partition wall member 18 communicate with the inlet 8, and the outer periphery and the lower part communicate with the outlet 17. The inside and outside of the partition wall member 18 communicate with each other through a through hole 19 and a weir 20. At the outlet 17, an automatic drain valve (not shown) such as a float valve is attached. A spherical hollow float 21 is arranged in the partition wall member 18. An actuating rod 22 which hermetically penetrates the casing 16 is connected to the float 21, and a potentiometer 23 is connected to the actuating rod 22. The float 21 rises and falls with the liquid level, and the operating rod 22 is simultaneously displaced. The displacement of the operating rod 22 is converted into an electric signal by a potentiometer 23.
This electric signal is sent to the arithmetic unit 9. The calculation unit 9 calculates the water content (W1) based on the relationship between the liquid level detected by the potentiometer 23 and the flow rate passing through the weir 20. still,
The drain flow meter is not limited to this weir type, and any type can be used.

FIG. 4 shows an example of the steam flow meter 5. An inlet 6 and an outlet 25 are formed at both ends of a tubular casing 24,
A throttle member 27 having an orifice 26 opened is provided on the way.
Pressure sensors 28 and 29 are provided before and after the orifice 26, and are connected to the calculation unit 9. The calculation unit 9 is a pressure sensor-2
The steam amount (W2) is calculated based on the pressure difference due to the pressure detected in steps 8 and 29. The steam flow meter is not limited to the differential pressure type, and any type can be used.

The calculating unit 9 calculates the calculated water content W1 and the calculated steam content W.
2, the wetness W1 / (W1 + W2) is calculated.
In the above embodiment, the steam flow meter is provided at the steam outlet of the steam separator, but a flow meter may be provided at the inlet of the steam separator. In this case, the amount of steam W3 containing water is measured,
The wetness W1 / W3 is calculated based on the water content W1 measured by the drain flow meter. When the separation efficiency of the steam separator 2 is not 100% but k%, the moisture amount W1 is corrected to 100 · W1 / k to calculate the wetness.

[0011]

The present invention has the following specific effects. As described above, according to the present invention, since the gas containing moisture is not overheated or superheated steam is required, the range of measurable wetness is widened and the wettability can be easily measured. In addition, since the flow rate flowing through the gas pipe is known, it is possible to improve the operation efficiency of equipment connected to the gas pipe and obtain data for judging an abnormality in the gas pipe.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wetness measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of the steam separator of FIG. 1;

FIG. 3 is a sectional view of the drain flow meter of FIG. 1;

FIG. 4 is a sectional view of the steam flow meter of FIG. 1;

[Explanation of Signs] 1 Steam pipe 2 Steam separator 3 Steam outlet 4 Drain port 5 Steam flow meter 7 Drain flow meter 9 Operation unit

Claims (1)

(57) [Claims] 1. A gas-water separator for separating water in a gas is provided in a gas pipe, and a water content (W1) is supplied to a drain port of the gas-water separator.
Provide a drain flow meter for measurement, at the gas outlet of the steam separator
Provide a flow meter to measure gas volume (W2)
Install a flow meter at the inlet of the separator to measure the fluid volume (W3).
A wetness measuring device provided with a calculation unit for calculating the wetness from the measured W1 and W2 or from W1 and W3 .