JPH11211680A - X-ray sulfur meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevents a detecting membrane from being corroded by a method wherein a metal material whose ionization tendency is larger than that of a beryllium material is used as a sacrificial anode electrode so as to be built in an X-ray sulfur meter and the detecting membrane made of a beryllium material is shifted to the side of a cathode reaction. SOLUTION: A sacrificial anode electrode 11 is installed near a detecting membrane 3 inside the conduit of a measuring tube 1, and it is composed of a metal material whose ionization tendency is larger than that of a beryllium material. An insulating coating film 12 is formed in the contact part of the detecting membrane 3 at the sacrificial anode electrode 11 with the measuring tube 1. X-rays which are emitted from an X-ray source 4 are transmitted through the detecting membrane 3 composed of a beryllium material, and a fluid to be measured FL (petroleum) is irradiated with the X-rays. Fluorescent X-rays which are reflected by the fluid to be measured FLo (petroleum) are counted by a measuring counter 5. The number of measured counts is proportional to the concentration of sulfur in the fluid to be measured FL0 (petroleum). As a result, the concentration of the sulfur in the fluid to be measured FLo (petroleum) can be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray sulfur meter with improved anticorrosion of a detection film.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory view of the structure of a conventional example generally used in the prior art.
1000MK2 X-ray tube type in-line sulfur analyzer ", page 5, issue date; September 6, 1994, issuer; Yokogawa Electric Corporation.

[0003] In Figure, the measuring tube 1 is a conduit through which the measurement fluid FL _o inwardly. In this case, a stainless steel material is used. The detection hole 2 is provided in the measurement tube 1.

The detection film 3 is provided so as to cover the detection hole 2 and is made of a beryllium material. In this case, the detection hole 2 has a convex shape toward the outside of the measuring tube 1. The reason for the convex shape in the external direction is to provide pressure resistance. If the pressure resistance does not matter, a flat shape may be used.

[0005] X-ray source 4 is transmitted through the detection film 3 is irradiated with X-rays to measure the fluid FL _o. Measurement counter 5 is reflected by the measurement fluid FL _o, to count the number of X-ray fluorescence.

The holding flange 6 is attached to the measuring tube 1 by the detecting film 3.
Is fixed. The O-ring 7 seals the detection film 3 and the measurement tube 1. The plug 8 faces the detection hole 2 and
It is provided in. By removing the plug 8, the inside of the detection film 3 is cleaned. O-ring 9 seals plug 8 and measuring tube 1.

[0007] In the above configuration, the X-rays emitted from the X-ray source 4 passes through the detection film 3 made of beryllium materials, irradiating the measuring fluid FL _o. Fluorescent X-rays reflected by the measured fluid FL _o, counted by the measurement counter 5.

[0008] The number of counts is measured, the measurement fluid FL _o
Is proportional to the sulfur concentration. As a result, the sulfur concentration of the measured fluid FL _o is measured.

However, in such an apparatus,
For example, during measurement of the sulfur concentration of petroleum, the detection film 3 made of beryllium material causes electrolytic corrosion, and pinholes are generated.
An oil spill occurred.

The cause of this is that, in the petroleum, seawater A containing dissolved oxygen adheres between the measuring tube 1 made of stainless steel and the detection film 3 made of beryllium as shown in FIG.

[0011] Stainless steel and beryllium, or
Between the oxygen and the beryllium material, an electrochemical corrosion action (electrolytic corrosion) using a different material and seawater as a medium occurs, the detection film 3 made of the beryllium material causing an anodic reaction is dissolved, and pinholes are generated. , A leak of oil.

The mechanism (state equation) is shown below. Anode reaction (dissolution reaction) of the detection film 3 of the beryllium film Be → Be ²⁻ + 2e

Cathode reaction (reduction reaction) of measuring tube 1 made of stainless steel 2H ⁺ + 2e → Cathode reaction of H ₂ dissolved oxygen (O ₂ ) (reduction reaction) 1 / 2O ₂ + H ₂ O + 2e → 2OH

The present invention solves this problem. An object of the present invention is to provide a detection film having improved corrosion resistance.
An object of the present invention is to provide a linear sulfur meter.

[0015]

In order to achieve this object, the present invention relates to (1) an X-ray type sulfur meter for detecting the sulfur concentration of a measurement fluid using a beryllium detection film, wherein the measurement fluid has an internal part. A measuring tube made of a metal material having a smaller ionization tendency than the flowing beryllium material, a detection hole provided in the measuring tube, a detection film provided by closing the detection hole and made of a beryllium material, and a pipeline of the measuring tube A sacrificial anode electrode made of a metal material having a greater ionization tendency than the beryllium material and provided in the vicinity of the detection film, an X-ray source that transmits the detection film and irradiates the measurement fluid with X-rays, An X-ray sulfur meter comprising: a measurement counter for counting the number of fluorescent X-rays reflected by a fluid. (2) The X-ray sulfur meter according to (1), further comprising a sacrificial anode electrode made of a magnesium material. (3) The X-ray sulfur meter according to (1) or (2), further comprising a sacrificial anode electrode provided in a ring shape around the detection hole. (4) The X-ray sulfur according to any one of (1) to (3), further including an insulating coating film provided on a contact portion of the sacrificial anode electrode between the detection film and the measurement tube. Total. (5) The X-ray sulfur meter according to any one of (1) to (4), further comprising a measuring tube made of stainless steel. It is what constituted.

[0016]

In the above configuration, the X-ray irradiated from the X-ray source
The line penetrates the detection film made of beryllium material and irradiates the measurement fluid. In this case, the measurement fluid is petroleum.

Fluorescence X reflected by the measurement fluid (petroleum)
The line is counted by a measurement counter. The measured count number is proportional to the sulfur concentration of the measurement fluid (petroleum). As a result, the sulfur concentration of the measurement fluid (petroleum) is measured.

Seawater containing dissolved oxygen is mixed in the petroleum to be subjected to sulfur measurement, and this seawater is deposited between the detection film made of beryllium material and the sacrificial anode electrode made of magnesium material. .

In such a state, the sacrificial anode electrode of the magnesium material performs an anodic reaction (dissolution reaction), the detection film of the beryllium material performs a cathodic reaction (reduction reaction), and the stainless steel measurement tube performs a cathodic reaction (reduction reaction). Reaction).

Further, the dissolved oxygen causes a cathodic reaction (reduction reaction), which causes electrolytic corrosion of the sacrificial anode electrode of the magnesium material, and does not cause corrosion and dissolution of the detection film of the beryllium material. Hereinafter, a detailed description will be given based on embodiments.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a main part of an embodiment of the present invention. In the figure, the configuration of the same symbol as FIG. 2 represents the same function. Hereinafter, only differences from FIG. 2 will be described.

The sacrificial anode electrode 11 is provided near the detection film 3 in the conduit of the measuring tube 1 and is made of a metal material having a higher ionization tendency than the beryllium material. In this case, a ring-shaped magnesium material is used.

The insulating coating film 12 is provided at a contact portion between the detection film 3 of the sacrificial anode electrode 11 and the measuring tube 1. In this case, an epoxy resin material or a Teflon resin material is used.

[0024] In the above configuration, the X-rays emitted from the X-ray source 4 passes through the detection film 3 made of beryllium materials, irradiating the measuring fluid FL _o. In this case, the measurement fluid FL _o is petroleum.

[0025] The fluorescent X-rays reflected by the measured fluid (oil) FL _o, counted by the measurement counter 5. Number measured count is proportional to the sulfur concentration in the measurement fluid (oil) FL _o. As a result, the sulfur concentration in the measurement fluid (oil) FL _o is measured.

Seawater A containing dissolved oxygen is mixed in the petroleum to be subjected to the sulfur measurement. The seawater A is applied between the detection film 3 made of beryllium and the sacrificial anode electrode 11 made of magnesium. Deposits on the surface.

In such a state, the anodic reaction (dissolution reaction) of the sacrificial anode electrode 11 of magnesium material Mg → Mg ²⁻ + 2e

Cathodic reaction (reduction reaction) of beryllium material detection film 3 Be ^{2 −} + 2e → Be Cathode reaction (reduction reaction) of stainless steel measuring tube 1 2H ⁺ + 2e → H ₂

Cathodic reaction (reduction reaction) of dissolved oxygen (O ₂ ) 1 / 2O ₂ + H ₂ O + 2e → 2OH occurs, which causes electrolytic corrosion of the sacrificial anode electrode 11 of magnesium material, and corrosion and dissolution of the detection film 3 of beryllium material. Does not occur.

It should be noted that the insulating coating film 12 serves as the sacrificial anode electrode 1.
The cathode reaction (reduction reaction) of the stainless steel measurement tube 1 does not occur because it is provided at the contact portion between the detection film 3 and the measurement tube 1.

As a result, (1) the magnesium material was incorporated into the X-ray sulfur meter as the sacrificial anode electrode 11, and the detection film 3 of the beryllium material was shifted to the cathode reaction side. X that can be prevented
A linear sulfur meter is obtained.

(2) The simple structure in which the sacrificial anode electrode 11 is incorporated between the measuring tube 1 and the detection film 3 makes it possible to obtain an inexpensive X-ray sulfur meter with improved corrosion resistance.
(3) Since a magnesium material is used for the sacrificial anode electrode 11, the magnesium material is versatile and a commercially available product can be easily obtained, so that an inexpensive X-ray sulfur meter can be obtained.

(4) Since the sacrificial anode electrode 11 is provided in a ring shape around the detection hole 2, an X-ray sulfur meter that can more reliably protect the detection film 3 can be obtained.

(5) The insulating coating film 12 is formed on the sacrificial anode 1
Since a cathode reaction (reduction reaction) of the stainless steel measurement tube 1 does not occur since the detection film 3 is provided at a contact portion between the detection film 3 and the measurement tube 1, the consumption of the sacrificial anode electrode 11 of magnesium material can be further reduced. A linear sulfur meter is obtained.

(6) Since the measuring tube 1 is made of stainless steel, an X-ray sulfur meter having better corrosion resistance can be obtained.

In the above embodiment, the measuring tube 1
Has been described as being made of stainless steel, but is not limited thereto, and may be, for example, a cast iron tube, an aluminum tube, or a nickel tube. In short, any metal material having a lower ionization tendency than the beryllium material may be used.

In the above embodiment, the sacrificial anode electrode 11 is described as being made of a magnesium material. However, the present invention is not limited to this. For example, a lithium material or a potassium material may be used. In short, any metal material having a higher ionization tendency than the beryllium material may be used.

[0038]

As described above in detail, according to the first aspect of the present invention, (1) a metal material having a higher ionization tendency than a beryllium material is incorporated in an X-ray sulfur meter as a sacrificial anode electrode. Since the detection film of beryllium material is shifted to the cathode reaction side, it is possible to prevent corrosion of the detection film of beryllium material.
A linear sulfur meter is obtained. (2) Since it has a simple configuration in which a sacrificial anode electrode is incorporated between the measurement tube and the detection film, corrosion resistance is improved and an inexpensive X-ray sulfur meter can be obtained.

According to the invention of claim 2 of the present invention, since a magnesium material is used for the sacrificial anode electrode, the magnesium material is versatile and can be easily obtained as a commercial product, so that an inexpensive X-ray sulfur meter can be obtained. Can be

According to the third aspect of the present invention, since the sacrificial anode electrode is provided in a ring shape around the detection hole, an X-ray sulfur meter that can more reliably protect the detection film can be obtained.

According to the invention of claim 4 of the present invention, since the insulating coating film is provided at the contact portion between the detection film of the sacrificial anode electrode and the measurement tube, the cathode reaction (reduction reaction) of the stainless steel measurement tube is performed. ) Does not occur, and an X-ray sulfur meter that can further reduce the consumption of the sacrificial anode electrode of the magnesium material can be obtained.

According to the invention of claim 5 of the present invention, since the measuring tube is made of stainless steel, an X-ray sulfur meter having better corrosion resistance can be obtained.

Therefore, according to the present invention, it is possible to realize an X-ray sulfur meter in which the corrosion prevention of the detection film is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a configuration of a conventional example generally used in the related art.

[Explanation of symbols]

 Reference Signs List 1 measurement tube 2 detection hole 3 detection film 4 X-ray source 5 measurement counter 6 holding flange 7 O-ring 8 plug 9 O-ring 11 sacrificial anode electrode 12 insulating coating film

Claims (5)

[Claims] An X-ray sulfur meter for detecting the sulfur concentration of a measurement fluid using a beryllium detection film, a measurement tube made of a metal material in which the measurement fluid flows inside and having a lower ionization tendency than the beryllium material, A detection hole provided in the tube, a detection film provided to cover the detection hole and made of a beryllium material, and a metal provided near the detection film in the conduit of the measurement tube and having a greater ionization tendency than the beryllium material A sacrificial anode electrode made of a material, and X that irradiates the measurement fluid with X-rays through the detection film.
An X-ray sulfur meter comprising: a radiation source; and a measurement counter for counting the number of fluorescent X-rays reflected by the measurement fluid. 2. The X-ray sulfur meter according to claim 1, further comprising a sacrificial anode electrode made of a magnesium material. 3. An X-ray sulfur meter according to claim 1, further comprising a sacrificial anode electrode provided in a ring shape around said detection hole. 4. The X according to claim 1, further comprising an insulating coating film provided on a portion of the sacrificial anode electrode in contact with the detection film and the measurement tube.
Linear sulfur meter. 5. The X-ray sulfur meter according to claim 1, further comprising a measuring tube made of stainless steel.