JPH08201376A - Ultraviolet-ray decomposer - Google Patents

Abstract

PURPOSE: To prevent the movement of the sample water in a reaction tube due to bubbles by forming the reaction tube into a straight tube shape, and surrounding the periphery with a ultraviolet lamp. CONSTITUTION: A ultraviolet lamp 2 is spirally wound along the longitudinal direction of the large-diameter tube 1a of a reaction tube 1 formed into a big straight tube shape. The tube diameter D of the large-diameter tube 1a is set large so that the movement of the sample water S is not hindered by expanded bubbles, and the tube diameter of the lamp 2 is set slender. The bubbles generated in a pipe 5 are heated by the ultraviolet lamp 2 and expanded in the large- diameter tube 1a , however the large-diameter tube 1a is formed into the straight tube shape and the tube diameter D is large, thus the movement of the sample water S is not hindered by the expanded bubbles. The sample water S is not extruded from the decomposition effective region of ultraviolet-rays by the expanded bubbles, and a fixed quantity of the sample water S is oxidation- decomposed and shifted to an analyzer 8 from a pipe 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet decomposer for irradiating sample water in a reaction tube with ultraviolet rays to decompose the sample water.

[0002]

2. Description of the Related Art A conventional ultraviolet decomposing device is constructed, for example, as shown in FIG. 5, by winding a thin and spiral reaction tube 22 around a straight tube-shaped ultraviolet lamp 21.

[0003]

However, since the reaction tube 22 is thin, the reaction tube 22 may be generated due to bubbles in the piping 25.
There is a problem that the sample water S therein moves from the effective position for decomposition of ultraviolet rays and reproducibility of decomposition cannot be obtained.

For example, a batch system is adopted in which a fixed amount of sample water S is transferred to the reaction tube 22 by the pump 24, and the fixed amount of sample water S is irradiated with ultraviolet rays from the ultraviolet lamp 21 to decompose the sample water S. In the case of doing, the sample water S in the reaction tube 22
Is heated by ultraviolet rays, the bubbles generated in the pipe 25 expand in the reaction tube 22. Since the expanded bubbles push the sample water S out of the decomposition effective position, the extruded sample water S is not decomposed and remains in the reaction tube 22.
Pass through.

Further, for example, the bent portion 2 of the reaction tube 22.
The bubbles expanded in 2a may stop moving and may not move, and the bubbles may accumulate.

Further, when a continuous decomposition system in which the sample water S is continuously transferred into the reaction tube 22 by the pump 24 and the sample water S is decomposed is adopted, the flow rate is apt to change due to bubbles, and therefore the analysis is performed. This is an inconvenient result for the analysis that the flow velocity of the sample water S sent to the total 26 is different.

The present invention has been made in view of the above problems, and an object thereof is to provide an ultraviolet decomposer capable of preventing the sample water in the reaction tube from moving due to bubbles.

[0008]

In order to achieve the above object, the present invention is an ultraviolet decomposer for irradiating a sample water in a reaction tube with ultraviolet rays to decompose the sample water, wherein the reaction tube is a thick straight tube. It is also characterized by being surrounded by an ultraviolet lamp.

[0009]

By enclosing the reaction tube with the ultraviolet lamp, a straight tube-shaped reaction tube along the longitudinal direction can be arranged at the central position of the ultraviolet lamp.

Further, the amount of ultraviolet rays can be adjusted by appropriately changing the length of the ultraviolet lamp.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited thereby. 1 and 2 show a first embodiment of the present invention in which an ultraviolet lamp is wound around a reaction tube. 1 and 2, reference numeral 1 denotes a thick straight tube-shaped reaction tube, and an ultraviolet lamp 2 is spirally wound along the longitudinal direction of the reaction tube 1. Reference numeral 3 is a sample water inlet of the reaction tube 1, which is, for example, in the case of a batch system, a fixed amount of sample water S from a sample water inlet (not shown) through a pipe 5 by a liquid feeding means 4 such as a pump. Is an inlet for transferring the gas into the reaction tube 1. 6 is an outlet for a sample that has been oxidatively decomposed by irradiation of ultraviolet rays from the ultraviolet lamp 2.
This sample is sent from the outlet 6 through the pipe 7 to the analyzer 8. Further, 9 is an electrode portion of the ultraviolet lamp 2,
Is a power source connected to the electrodes 9a and 9b, and 20 is a valve.

The spiral ultraviolet lamp 2 surrounds the large-diameter cylinder 1a of the reaction tube 1 in a state of being wound at an equal pitch interval d, and further, the outside of the ultraviolet lamp 2 is
It is enclosed and sealed by a casing 11 in which the reflector 10 is installed. The casing 11 is arranged coaxially with the central axis H of the ultraviolet lamp 2 along the longitudinal direction of the reaction tube 1, and the reflector 10 is attached to the casing 11 so as to be located in the ultraviolet decomposition effective region P. ing. The reflector 10 reflects a part of the ultraviolet rays emitted from the ultraviolet lamp 2 toward the large-diameter cylinder 1a. In addition, 11 a is a sealing lid of the casing 11.

Further, the casing 11 is filled with an inert gas R to prevent ozone from being generated in the air atmosphere by ultraviolet rays.

Further, the tube diameter D of the large-diameter cylinder 1a is set large so that the movement of the sample water S is not hindered by the expanded bubbles, while the tube diameter of the ultraviolet lamp 2 is the same as the conventional one. It is set thinner than the one. The size of the bubbles depends on the viscosity of the sample water S, the flow velocity, the temperature, and the like.
1b is a small-diameter cylinder that constitutes the sample outlet side of the reaction tube 1.

In this embodiment, even if the bubbles generated in the pipe 5 are heated by the ultraviolet rays and expanded in the large-diameter cylinder 1a, the large-diameter cylinder 1a has a straight pipe shape and is thick. The movement of the sample water S is not disturbed. Further, the expanded bubbles do not push the sample water S out of the ultraviolet ray decomposition effective region P, and a fixed amount of the sample water S is oxidized and decomposed in the decomposition effective region P.

Thereafter, the oxidatively decomposed sample is transferred from the pipe 7 to the analyzer 8.

Further, by appropriately setting the pitch interval d of the ultraviolet lamp 2, the lamp length L can be expanded / contracted, whereby the amount of ultraviolet light applied to a fixed amount of sample water S can be adjusted. Moreover, since the reflection plate 10 is provided, it is possible to adjust the decomposition effective area P to supply the most effective amount of light according to the amount of the sample water S, and it is possible to efficiently decompose a fixed amount of sample water S.

Further, since the inside of the casing 11 is purged with the inert gas R, ozone is not generated even when it is irradiated with ultraviolet rays.

In this embodiment, the oxidative decomposition of the batch system was shown, but the present invention is also applied to the case where the continuous decomposition system of continuously transferring the sample water into the reaction tube to decompose the sample water is adopted. it can. Also in this case, since the large diameter cylinder has a thick straight tube shape, it is not affected by the bubbles expanded in the large diameter cylinder. Therefore, it is possible to surely avoid the situation where the flow velocity of the sample water S sent to the analyzer is different.

FIG. 3 and FIG. 4 show a second embodiment of the present invention constructed so as to surround a reaction tube with a UV lamp having a multi-U shape.

3 and 4, an ultraviolet lamp 2 surrounds the reaction tube 1 along the longitudinal direction of the reaction tube 1 having a straight tube shape. The ultraviolet lamp 2 has a shape in which a plurality of U-shapes are connected, and surrounds the outer surface of the large-diameter cylinder 1a over substantially the entire circumference. Further, the outside of the ultraviolet lamp 2 is enclosed and sealed by a casing 11 in which a reflecting plate 10 is installed.
The same components as those shown in FIGS. 1 and 2 are designated by the same reference numerals.

In each of the above-mentioned embodiments, the reflector 10 is provided and the inside of the casing 11 is purged with the inert gas R. However, the present invention does not have the reflector. It is needless to say that the present invention can be applied to those having a structure in which the inside of the casing is not purged with the inert gas R, and further to an ultraviolet decomposer having neither of these structures.

[0023]

As described above, in this invention, since the reaction tube is a straight tube, it is possible to prevent the sample water in the reaction tube from moving due to bubbles.

Further, the amount of lamp light can be adjusted by appropriately changing the length of the ultraviolet lamp.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an overall configuration showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a main part configuration in the embodiment.

FIG. 3 is an explanatory diagram of an overall configuration showing a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a main part configuration in the second embodiment.

FIG. 5 is an explanatory diagram of an overall configuration showing a conventional example.

[Explanation of symbols]

1 ... Reaction tube, 2 ... Ultraviolet lamp, 9 ... Electrode part, S ... Sample water.

Claims (1)

[Claims] 1. An ultraviolet decomposer for irradiating sample water in a reaction tube with ultraviolet rays to decompose the sample water, wherein the reaction tube is a straight tube and is surrounded by an ultraviolet lamp. vessel.