JPS6022653A - Measuring device for concentration of chlorine ion - Google Patents

Abstract

PURPOSE:To measure continuously the chlorine ion content in a sample by providing a measuring vessel which has a sample feed part under the water surface, has a take-out port for the separated sample at the lower part and an overflow pipe connected to the take-out port and risen upward to maintain the constant water level and is filled with water. CONSTITUTION:A slight amt. of flon vapor is taken out through a control valve 19 for taking out sample and is fed through a sample feed tube 12 into the water in a measuring vessel 1. A stirrer 9 is provided in the device 1 to mix and stir thoroughly the sample and water so that the chlorine is dissolved in water. The separated liquefied flon overflows from the mid-way of an overflow pipe 8 and is discharged through a sample overflow pipe 13 and a liquid level meter 4 of flow rate to the outside. The concn. of the chlorine ion in the vessel 1 is detected by the electrode 2 of a conductivity meter dipped in the water. The signal of the conductivity meter and the signal of the flowmeter are respectively transmitted to a chlorine ion concn. meter 6 and the chlorine concn. in the flon is calculated by the equation ( I ).

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a device for measuring the amount of chlorine generated by decomposition of fluorocarbons in a Rankine cycle plant using fluorocarbons as a working medium.
In particular, the present invention relates to a chloride ion concentration measuring device suitable for automatic continuous measurement.

[Background of the invention]

Conventionally, chloride ion concentration was measured by titration. However, this method has the disadvantage that continuous measurements cannot be performed. Furthermore, this conventional method is unsuitable for use in cases where chlorine generation fluctuates.

[Purpose of the invention]

An object of the present invention is to provide a chlorine ion concentration measuring device that can continuously measure the concentration of chlorine in fluorocarbon vapor or liquid in a Rankine cycle plant using fluorocarbons as a working medium.

[Summary of the invention]

The present invention provides that since chlorine is easily absorbed and dissolved in water and ionized, the concentration in water can be measured with a conductivity meter;
We attempted to measure the amount of chlorine ions by injecting chlorine-containing fluorocarbon vapor or liquid into water, taking advantage of the property that fluorocarbon liquid does not dissolve in water but separates and accumulates at the bottom of the water due to the difference in specific gravity. It is something to do.

That is, the present invention provides an apparatus for measuring the amount of chlorine generated by fluorocarbon decomposition in a Rankine cycle plant that uses fluorocarbons as a working medium, which has a sample injection port below the water surface and is connected to a separated sample outlet and an outlet at the bottom. A measurement container filled with water with an overflow tube raised upwards is installed so that the water level remains constant, and the conductivity meter electrode is immersed in the water, thereby continuously measuring the chloride ion content in the sample. It is characterized by the following structure.

The concentration of chlorine in the fluorocarbon steam or waste can be determined by dividing the measured amount of chlorine ions by the amount of fluorocarbon vapor or liquid that passed during that time. Therefore, for example, by measuring the flow rate of CFCs,
The chlorine concentration in the syphron can be measured by a calculator that divides the electrical signal representing the amount of chlorine ions using the electrical signal.

In order for Freon to flow continuously into water, it must be separated from water and discharged, but this is easy because Freon does not dissolve in water and has a higher specific gravity than water. be. That is, if the outlet is provided at the bottom of the water container as described above, the fluorocarbon liquid can be easily discharged while the interface between the water and the fluorocarbon liquid is above the outlet.

However, in order to keep the Freon liquid level and water level constant, the discharge port must be connected to the overflow pipe set up as described above. For this rise, if an overflow hole is installed in the middle of the pipe at a height equal to (water specific gravity ÷ Freon specific gravity) relative to the water surface height on the container side, the liquid level will always be kept constant and the injected water will be Freon can be extracted continuously.

[Embodiments of the invention]

An embodiment of the invention is shown in the accompanying drawings. Freon steam pipe 16
In this example, steam from the sinking cycle is flowing through the tank, and the chlorine concentration in this steam is being measured.

This chlorine ion fmFfi measuring device is provided with a measuring container 1 filled with water 1a. The measurement container l has a sample inlet 12a below the water surface 1b, a separated sample takeout port 8a at the bottom, and an overflow pipe connected to the takeout port 8a and raised upward so that the water level remains constant. It has 8. The chlorine ion content in the sample is continuously measured by immersing the water 1aK electric barrel Gunkeiyagoku 2 in such a measuring container 1.

In this embodiment, a trace amount of fluorocarbon vapor is taken out through the sample takeout control valve 19 and injected into the water in the measurement container 1 through the sample injection tube 12. A stern 9 is installed in the measurement container 1 to mix and stir the sample and water well.
The stirrer 11 of the stern 9 is rotated so that the chlorine is dissolved in the water. Freon is denser than water, 1.
Since the amount of water is about 5 times higher, the Freon injected into the water 1a immediately sinks downward, and during that time, the water 1a (!:
To dissolve the chlorine in the Freon into the water 1a,
This is how it is stirred. At the bottom of the measurement container l, there is a freon outlet 8a below the level of the freon liquid collected below.
and the start-up overflow pipe 8 connected to it are located, so the fluorocarbon liquid flows from the middle of the overflow pipe 8 through the overflow pipe and the sample overflow pipe 13, flows into the flow rate level gauge 4, and then flows into the flow rate level gauge 4. 14,
It is discharged to the outside through the flow restrictor orifice 7 and the drain pipe 15. A flow rate level meter 4 detects the flow rate at the liquid level, and a flow rate transmitter 5 transmits the flow rate based on a liquid level detector 10 that electrically detects that the flow rate Q is proportional to the square root of the liquid height h. It is composed of.

Concentration of ions in the water in the measuring container 1 (detected by the conductivity meter electrode 2 immersed in the water) is output as an electrical signal by the conductivity transmitter 3.

The conductivity signal is transmitted to the chlorine ion concentration meter 6 by the conductivity meter cable 17, and the flow meter signal is transmitted to the chlorine ion concentration meter 6 by the flow meter cable 18, and the chlorine concentration in the fluorocarbon is determined by the following division. be done.

ΔU - Concentration of chlorine in water Δpx Amount of water in the measurement container g Δp = a x ΔS + b (a and b are constants) ΔS = Conductivity of water (μS / cm ) Amount of fluorocarbons flowing in 20421 hours ΔT 2 hours calculation C should be represented by an indicator. In addition, sub-container 1
Pure water is preferable from the viewpoint of measurement accuracy. Also,
When the concentration exceeds a certain level, the accuracy and life of the electrode 2 will deteriorate.
value. This is because when the chlorine temperature becomes high, the coffin maker will fall and blood 1 and 2 will deteriorate more easily. Therefore, it is preferable to change the water regularly.

By installing the measuring device as described above in a Rankine cycle plant, the amount of chlorine generated by fluorocarbon decomposition can be continuously recognized. Therefore, it is possible to operate a plant that avoids decomposition of fluorocarbons.

The generation of chlorine due to the decomposition of fluorocarbons not only results in the loss of fluorocarbons, but also combines with the water that inevitably enters to produce hydrochloric acid, which causes unavoidable corrosion in the container, causing leaks in heat exchangers, etc. Although this causes serious problems, such serious accidents can be prevented by continuous and automatic detection of chlorine ions.

It should be noted that, as a matter of course, the present invention is not limited to the illustrated embodiment.

〔Effect of the invention〕

As described above, according to the present invention, 1 fluorocarbon is used as the working medium because it is possible to continuously measure the chlorine ion concentration of the specimen, and even for specimens whose chlorine generation varies with high accuracy. It has the effect of being suitable for measuring the concentration of chlorine in fluorocarbon vapor or fluorocarbon liquid in Rankine cycle plants, and by adopting it in plants that use fluorocarbons as shown in parentheses, it can be used to reduce the consumption of fluorocarbons and various types of chlorine caused by decomposition of fluorocarbons. You can prevent problems from occurring.

[Brief explanation of the drawing]

The drawings are block diagrams showing one embodiment of the present invention. 1...Measurement container, la...Water, lb...-Water surface, 2
... Conductivity meter electrode, 3... Conductivity optical transmitter, 4... Flow rate level gauge, 5... Flow rate transmitter, 6... Chlorine ion a
temperature meter, 7...Flow rate restrictor orifice, 8...Bunshige overflow tube, 8a...Sample outlet, 9...Stern, 1o...Liquid level detector, 11...Stirrer ,1
2... Sample injection tube, 12a... Sample injection port,
13... Sample overflow pipe, 14... Flowing rewiring pipe, 15... Drain pipe, 16... Freon steam pipe, 17... Heavy j meter cable, 18... Flow meter cable, 19...Sample take-out control valve, 20...Float. Agent Patent Attorney Masami Akimoto

Claims (1)

[Scope of Claims] 1. A device for measuring the amount of chlorine generated by decomposition of fluorocarbons in a Rankine cycle plant using fluorocarbons as a working medium, which has a sample injection port below the water surface, and a separate sample takeout port and a takeout port at the bottom. A measurement container filled with water is connected to the water and has an overflow pipe raised upwards so that the water level remains constant.The conductivity meter electrode is immersed in the water, and the chlorine ion content in the sample is continuously measured. A chlorine ion concentration measuring device characterized in that it is configured to measure chlorine ion concentration. 2. In claim 1, a flow rate transmitter for measuring the flow rate of the sample flowing out of the overflow tube and a signal from the conductivity meter are used, and the time increment of the conductivity is divided by the flow rate. A chlorine ion concentration measuring device characterized in that the chlorine ion concentration in a sample is continuously measured from the electrical conductivity per unit flow rate of the sample.