JPS60146142A - Apparatus for measuring wetness of steam - Google Patents

Abstract

PURPOSE:To measure wetness simply, by heating the inside of a measuring container, converting wet steam to be measured into overheated steam, thereby heating the wet steam to be measured by a simple constitution. CONSTITUTION:All valves 7-9, 13 and 14 are opened, and wet steam to be measured is made to pass into containers 1 and 2. Then, the valves 13 and 14 are closed and the wet steam to be measured is stored in the containers 1 and 2. Thereafter the valve 8 is closed. Then, the wet steam in the container 1 is heated by an electric heater 17 and made uniform by an agitator 16. Thus the volume is expanded. At this time, the valves 7 and 9 are opened. Therefore, the pressure in the containers 1 and 2 is not changed. A piston 18 is slid in a cylinder 3 in the direction toward the container 2. An external magnetic body 20 is displaced together with the piston 18 owing to the magnetic coupling with an internal magnetic body 19. The displacement is detected by a variable resistor 22 and inputted to a microcomputer 23. The amount of volume expansion is computed from the input value, and the wetness is measured.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a device for measuring moisture traces of steam, and more particularly to a structure for measuring wetness by heating wet steam under a constant pressure and superheating it into vapor.

Technical background In various boilers and devices that utilize steam power, dryness x indicates the moisture content in the steam flow, that is, the ratio of the mass of dry saturated steam to the total mass per unit volume of the steam flow. 1 or humidity (1-X).

This is because the enthalpy of steam differs depending on the water content a.

A device for measuring the wetness of steam is a squeeze dryer.

This passes the wet steam through the nozzle to the thermometer and the pressure n1
is injected into a measurement container attached to it, causing it to expand adiabatically, turning it into a superheated steam state, and measuring the humidity.

This method has a problem in that the range of wet steam that can be measured is limited. However, if the pressure of the steam is low, the pressure must be very low to reach the superheated steam state in the container, and if the steam is highly wet, it will expand and recede into the hot steam state. This is to prevent this from happening.

Conventional technology and its problems Conventionally, the wet steam to be measured is passed through the inner pipe of a double pipe, and the same amount of superheated steam is flowed into the outer pipe, and the wet steam to be measured is heated by this superheated steam flow to produce superheated steam. The humidity is measured by sampling the steam to be measured.

The above method requires superheated steam as a heating source, and it is difficult to flow the same amount of superheated steam as the wet steam to be measured or to sample the wet steam to be measured.

Technical Problem The technical problem of the present invention is to easily measure the humidity by heating the wet steam to be measured using a simple structure.

Technical Means The technical means of the present invention taken to solve the above-mentioned technical problems are as follows: (a) A measurement container containing the vapor to be measured and a container communicating with the vapor to be measured system are connected by a cylinder, (a piston is placed inside the long cylinder, (c) an electric heater is installed inside the measuring container, and (d) a means for detecting the saturated steam state inside the measuring container is provided.

Action of technical means The operation of the above technical means is as follows.

The inside of the measurement container is heated with an electric heater to superheat the wet steam to be measured. At this time, since the back surface of the piston is in communication with the wet steam system to be measured, the pressure inside both containers and the cylinder is constant, and the wet steam in the measurement container expands in volume, and the piston moves. The saturated steam condition is detected from the difference in the degree of displacement of the piston. Alternatively, a thermometer is attached to the measurement container to detect the saturated vapor state at the point where the temperature begins to rise. The amount of volumetric expansion is calculated from the amount of displacement of the piston when this saturated steam state is reached, and the wetness (1-X) is calculated using the following formula: 1-X-△V/ (V + ΔV) (where, ■- volume of wet steam in the measuring vessel before heating,
It can be determined by: V - volumetric expansion when the saturated vapor state is reached.

Unique effects The present invention produces the following unique effects.

An electric heater heats wet steam to a superheated steam state, so
Unlike the conventional method, superheated steam is not required as a heating source, and the structure is simplified.

The wet steam in the measurement container is heated, the piston is displaced under constant pressure, and the humidity is measured from the amount of volumetric expansion, so there is no need for sampling, etc., and the structure is simple.

DESCRIPTION OF EMBODIMENTS An embodiment illustrating a specific example of the above technical means will be described (see drawings).

A container 1.2 containing the wet steam to be measured is connected by a cylinder 3. A wet steam introduction passage 4 is connected to the containers 1 and 2 via branch pipes 5 and 6, and valves 7 and 8.9 are arranged in the introduction passage 4 and the branch pipe 5.6. The other end of the introduction passage 4 is connected to a wet steam space to be measured (not shown). Connect the wet steam outlet passage 10.11 to the container 1.2, and connect the outlet passage MJ10.
, 11 merge into one line. A valve 14.13 is arranged in the outlet channel 10 and in the combined light. Container 1, thermometer 15, stirrer 1
6. Attach electric heater 17. A piston 18 is disposed within the cylinder 3. The piston 18 has an internal magnetic body 1
Attach 9. An external magnetic body 20 is arranged on the outer periphery of the connecting pipe 3 in correspondence with the internal magnetic body 19 . Piston 1 in container 2
Attach a rod 21 that pushes 8 back into place. A variable resistor 22 is connected to the external magnetic body 20, and a computer 23 is connected to the variable resistor 22.

Next, the measurement of humidity using this device will be explained.

All valves 7.8.9.13.14 are set at l1D1 to allow the wet steam to be measured to pass through the vessel 1.2. Next, valve 13.
14 to collect the wet steam to be measured inside the container 1.2,
Then piece 8 is closed. Next, the wet steam in the container 1 is heated with an electric heater 17, and then homogenized with a stirrer 16 while being uniformly distributed.

At this time, since the valves 7 and 9 are open, the piston 18 slides within the cylinder 3 toward the container 2 without changing the pressure inside the container 1. The external magnetic body 20 is displaced together with the piston 18 due to the magnetic coupling force with the internal magnetic body 19 . This displacement is detected by the variable resistor 22 and input to the microcomputer 23.

The computer 23 detects the saturated steam state at the point where the value output from the variable resistor 22 changes, calculates the amount of volumetric expansion from the input value at this time, and measures the wetness of the melon.

Alternatively, the saturated steam state may be detected at the point where the temperature of the thirst resistance 15 begins to rise, and the humidity may be measured using the input value from the variable resistor 22 at this time.

[Brief explanation of drawings]

The drawing is a diagram schematically showing a steam wetness measuring device according to the present invention. 1.2: Container 3 Nijiring for containing the wet steam to be measured;
15: Thermometer 17: Electric heater, 18: Piston patent applicant

Claims (3)

[Claims] (1) A measurement container containing the steam to be measured and a container communicating with the steam to be measured system are connected by a cylinder, a piston is placed in the cylinder, an electric heater is installed in the measurement container, and the state of saturated steam in the measurement container is determined. A steam humidity measuring device equipped with a means for detecting humidity. (2) The wetness measuring device according to claim W11, characterized in that the saturated steam state is determined by the displacement of the piston. (3) The humidity measuring device according to claim 1, wherein a thermometer is installed in a room in which an electric heater is placed, and the humidity measuring device is characterized by a superheated steam state at the point where the temperature starts to rise.