JPH0743330A - Ultraviolet reaction vessel - Google Patents

Abstract

PURPOSE:To obtain an ultraviolet reactor having a compact structure and enhancing emission efficiency by providing an outer pipe, the coating film applied to the pipe wall thereof, low pressure mercury and a passage forming reaction pipe. CONSTITUTION:A pair of electrodes G, G bringing low pressure mercury 13 enclosed in a quartz outer pipe 11 to a plasma state by discharge to generate ultraviolet rays having a desired wavelength are provided to the respective end surfaces of the quartz outer pipe 11. An ultraviolet reaction vessel U is, for example, an ultraviolet light source emitting ultraviolet rays with a low wavelength of 185nm and can realize radical reaction advantageous to the decomposition of org. matter. Since the ultraviolet light source receives a synthetic quartz reaction tube 14 forming a spiral sample passage S, the vessel U becomes a compact structure. Since the inner wall of the outer pipe 11 has a mirror surface by an aluminum coating film 12, the leakage of harmful ultraviolet rays to the outside is prevented. By the even balance of the diameter of the passage S and the irradiation length of ultraviolet rays, reaction temp. is well controlled while the rise of ultraviolet density in the pipe is suppressed and emission efficiency is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet light reaction container, more specifically, TOC (Total Organic Carbon).
Analyzer, TN (Total Nitrogen) analyzer for NO ₂ detection, or TP (Total Phospha) for PO ₄ ³ -detection
te) The present invention relates to an analyzer, and further to a novel ultraviolet light reaction vessel with a built-in reaction tube that can be used in an ozone generator.

[0002]

2. Description of the Related Art Conventionally, for example, sample water is supplied to a reaction tank, the conductivity thereof is detected, and then the sample water is irradiated with ultraviolet rays by an ultraviolet lamp to oxidize organic carbon compounds contained in the sample water. As shown in FIG. 2, in the TOC analyzer which detects the change in conductivity of the sample water due to the decomposition of CO ₃ ^2- generated by CO ₂ generated at this time, as shown in FIG. It has been proposed to irradiate the sample water S in the reaction tank 3 with the ultraviolet light from the lamp 2. The drain after the reaction is discharged from the discharge port 5 via the valve 4. Reference numerals 6, 7, 8 and 9 respectively indicate a lamp power supply,
These are a conductivity / temperature sensor, a conductivity / temperature measuring circuit, and a control circuit.

[0003]

However, the ultraviolet lamp 2 used in this TOC analyzer is separated from the reaction tank 3 by the partition window 1, and the ultraviolet lamp 2 and the reaction tank 3 are separately configured. Therefore, the structure in which the ultraviolet lamp 2 is placed and maintained in the N ₂ gas atmosphere A and the partition window 1 is fixed so that the N ₂ gas and the sample water S do not leak is not simple.

The same is pointed out for the TP analyzer or the TN analyzer.

The present invention has been made in view of the above problems, and an object thereof is to provide an ultraviolet light reaction container having a compact structure and capable of improving luminous efficiency.

[0006]

In order to achieve the above object, the ultraviolet light reaction container of the present invention is enclosed in an outer tube, a coating film for coating the tube wall of the outer tube, and the inside of the outer tube. And low pressure mercury, and a reaction tube which forms a flow path and is disposed inside the outer tube under the low pressure mercury atmosphere.

[0007]

[Function] Since the ultraviolet light source has a built-in reaction tube for forming a flow path, the ultraviolet lamp and the reaction tank are conventionally constructed separately, and the ultraviolet lamp is placed and maintained in an N ₂ gas atmosphere. To obtain an ultraviolet light reaction container with a compact structure that has both a UV lamp and a reaction tank, which has a complicated structure for fixing the partition window so that N ₂ gas and sample water do not leak. You can Further, since the flow path is formed in the ultraviolet light source, it is possible to set the flow path to an appropriate shape, flow path diameter, and ultraviolet irradiation length, and moreover, for example, within a time required for reaction of the sample flow. It can be stopped and controlled so that it exists, or the flow velocity can be controlled. Also,
By covering the outer wall of the outer tube with a coating film, it is possible to prevent harmful UV rays from leaking out of the outer tube, and since it is possible to use the reflection of UV rays, it is possible to balance the flow path diameter and the UV irradiation length. As a result, it is possible to realize favorable regulation of the reaction temperature while suppressing an increase in the ultraviolet density inside the outer tube, and to improve the luminous efficiency.

[0008]

Embodiments of the present invention will be described below.
However, the present invention is not limited thereby. In FIG. 1, for example, an ultraviolet light reaction container U that can be used in a TOC analyzer includes an outer tube 11, a coating film 12 that coats an inner wall (which may be an outer wall) of the outer tube 11, and an inside of the outer tube 11. The low-pressure mercury 13 enclosed in the sample tube S and the sample tube S provided inside the outer tube 11 under the low-pressure mercury atmosphere.
It mainly consists of the reaction tube 14 which forms

Further, the outer tube 11 is a quartz outer tube, the coating film 12 is an aluminum thin film, and the reaction tube 14 forms a spiral sample flow path S along the longitudinal direction of the quartz tube outer tube 11. It is composed of a synthetic quartz reaction tube with good UV transmittance.

On each end face of the quartz sheathed tube 11, low-pressure mercury 13 sealed inside the quartz sheathed tube 11 by electric discharge.
Is provided with a pair of electrode portions G, G for generating ultraviolet rays having a desired wavelength by making the plasma state. The ultraviolet light reaction container U of this embodiment has, for example, 185 nm.
It is an ultraviolet light source capable of producing a low wavelength of, and by this, a radical reaction advantageous for decomposition of organic substances can be realized.

Since this embodiment has the above-mentioned structure, the ultraviolet light source contains the synthetic quartz reaction tube 14 forming the spiral sample flow path S. Compared with the conventional one in which the lamp and the reaction vessel are separately configured, a structure having a clearly compact structure can be obtained. Further, since the sample flow path S is formed in the ultraviolet light source, the sample flow path S can be set to have an appropriate shape, flow path diameter, and ultraviolet irradiation length, and moreover, the time required for the reaction of the sample flow. It can be controlled to stop so that it exists inside, or to control the sample flow rate. In addition, harmful aluminum is protected from harmful ultraviolet rays by mirroring the inner wall of the quartz outer tube 11 with the aluminum coating film 12.
It is possible to prevent leakage from the inside to the outside, and moreover, since the reflection of ultraviolet rays can be utilized, the ultraviolet density inside the quartz exterior tube 11 can be controlled by the balance with the flow path diameter of the spiral sample flow path S and the ultraviolet irradiation length. Good control of the reaction temperature can be realized while suppressing the increase, and the luminous efficiency can be improved.

In the present embodiment, the UV light reaction container U is applied to a TOC analyzer. However, the UV light reaction container of the present invention may be a TN analyzer, a TP analyzer, or
It can also be applied to ozone generators.

Further, an ozone decomposing unit may be connected in a subsequent stage as a device for treating ozone coexisting in the sample after the ultraviolet oxidation reaction.

[0014]

As described above, according to the present invention, since the ultraviolet light source has the reaction tube for forming the flow passage therein, the ultraviolet lamp and the reaction tank are conventionally constructed separately. A compact structure with both an ultraviolet lamp and a reaction tank, which had a complicated structure in which it was kept in a ₂ gas atmosphere and the partition window was fixed so that N ₂ gas and sample water did not leak. An ultraviolet light reaction container having a different structure can be obtained. Further, since the flow path is formed in the ultraviolet light source, the flow path can be set to have an appropriate shape, flow path diameter, and ultraviolet irradiation length, and the flow exists within the time required for the reaction. Stop control and flow velocity can be controlled. Further, by mirroring the tube wall of the outer tube with a coating film, it is possible to prevent harmful ultraviolet rays from leaking out of the outer tube, and furthermore, since reflection of ultraviolet rays can be used,
Due to the balance between the flow path diameter and the ultraviolet irradiation length, it is possible to realize good control of the reaction temperature while suppressing an increase in the ultraviolet density inside the outer tube and improve the luminous efficiency. Further, as an ultraviolet light reaction container having both an ultraviolet lamp and a reaction tank, there is an effect that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a configuration in a conventional example.

[Explanation of symbols]

11 ... Quartz exterior tube, 12 ... Aluminum thin film (coating film), 13 ... Low-pressure mercury, 14 ... Synthetic quartz reaction tube, U ... Ultraviolet light reaction container, S ... Flow path.

Claims (2)

[Claims] 1. An outer tube, a coating film for covering the tube wall of the outer tube, low-pressure mercury sealed inside the outer tube, and a low-pressure mercury atmosphere which is disposed inside the outer tube, An ultraviolet light reaction container comprising a reaction tube forming a passage. 2. The outer tube is a quartz outer tube, the coating film is an aluminum thin film, and the reaction tube forms a spiral flow path along the longitudinal direction of the quartz outer tube and has a good ultraviolet transmittance. The ultraviolet light reaction container according to claim 1, which is a synthetic quartz reaction tube.