JP2007263813A - Combustion type water quality measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion type water quality analyzer capable of preventing the imperfect combustion of a target component accompanied by the local sudden temperature fall of the dripping point in a combustion part when sample water is dripped in the combustion part. <P>SOLUTION: In the combustion type water quality analyzer equipped with the combustion part 30 for combusting sample water therein and a sample water dripping nozzle 48 and constituted not only to allow the liquid droplet of the sample water to fall in the combustion part from the dripping nozzle but also to measure the component in the gas obtained by combusting the falling liquid droplet in the combustion part, a dripping nozzle moving means for moving the dripping nozzle in a lateral direction is provided. As the dripping nozzle moving means, for example, one constituted of a rotary motor 44 and a rotary body 46 and rotating the dripping nozzle along a horizontal plane can be used. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a combustion-type water quality analyzer that measures components in a gas obtained by burning sample water in a combustion section.

  Conventionally, a combustion section for burning sample water inside and a dropping nozzle for sample water are provided, and a droplet of sample water is dropped into the combustion section from the dropping nozzle, and the dropped droplet is burned in the combustion section. Combustion-type water quality analyzers that measure the components in the gas obtained by the above process are known. Examples of such combustion-type water quality analyzers include, for example, a total organic carbon measuring device (TOC meter) that measures the amount of organic matter contained in sample water in order to measure the pollution of drainage and rivers, and nitrogen for the same purpose. There are total nitrogen measuring devices that measure the amount, or devices that combine these.

  In this case, the structure shown in FIG. 5 is conventionally used as the combustion part and the dropping nozzle of the combustion-type water quality analyzer. In FIG. 5, 10 is a combustion part, 12 shows a dripping nozzle. The combustion unit 10 includes a catalyst packed layer 16 filled with a catalyst inside a combustion tube 14 made of quartz glass or the like, and a catalyst protective layer 18 filled with a catalyst protective material above the catalyst packed layer 16. A heating unit 20 for heating the inside of the combustion tube 14 is provided around the combustion tube 14. In this case, an oxidation catalyst such as a platinum catalyst is used as the catalyst, and ceramic beads, quartz wool, or the like is used as the catalyst protection material. Moreover, the heating part 20 is comprised with a heater and a heat insulating material.

  When water quality analysis is performed using the combustion-type water quality analyzer of the present example, the inside of the combustion pipe 14 is heated by the heating unit 20 and a carrier gas is flowed into the combustion pipe 14 from above, and the sample is dropped by the dropping nozzle 12. A water droplet 22 is dropped into the combustion tube 14 from above. In addition, sample water is measured with a slide valve or a syringe pump, for example, and is dripped from the dripping nozzle 12 with air or a pump. The droplets 22 are heated and vaporized in the combustion tube 14, and predetermined components in the vaporized gas are oxidized by the action of the catalyst in the catalyst packed bed 16. The gas component is introduced into the detector 24 by the carrier gas, and the component in the gas is measured.

In the combustion type water quality analyzer described above, the sample water is burned at a high temperature, a predetermined component in the combustion gas is measured with a detector such as a non-dispersive infrared analyzer (NDIR), and the concentration of the measurement object is converted. Is going. For example, in a TOC meter, droplets of sample water are dropped into the combustion section and burned, and organic substances in the sample water are oxidized and converted to carbon dioxide (CO ₂ ), and the CO ₂ concentration in the combustion gas is changed to NDIR. The organic carbon concentration in the sample water is obtained by measuring with.

  In this case, the inside of the combustion section is usually heated to about 600 to 950 ° C., but when the amount of sample water dripped is large, when the sample water is dripped, the dripping point (the sample water droplets in the combustion section are not dropped). In some cases, the target component in the sample water did not completely burn.

  As a technique for solving the above-mentioned problem, there is a technique in which sample water dropped into a combustion part is dispersed by a dispersion (platinum net) provided in several stages at predetermined intervals and then brought into contact with a catalyst (patent) Reference 1). However, this technique requires a structure for processing the platinum mesh and for holding the platinum mesh in a heating unit with a small space.

Japanese Utility Model Publication No. 52-155592

  Since the present invention is made in view of the above-described circumstances, it prevents incomplete combustion of a target component accompanying a local rapid temperature drop at a dropping point in a combustion portion when sample water is dropped into the combustion portion. An object of the present invention is to provide a combustion-type water quality analyzer capable of performing

  In order to achieve the above object, the present invention comprises a combustion section for burning sample water therein and a sample water dropping nozzle, and drops the sample water droplets from the dropping nozzle into the combustion section. In the combustion-type water quality analyzer that measures the components in the gas obtained by burning the produced droplets in the combustion section, a dropping nozzle moving means for moving the dropping nozzle in the lateral direction is provided, and the dropping nozzle moving means drops Provided is a combustion-type water quality measuring apparatus characterized in that sample water is dropped after moving a nozzle in a lateral direction or while moving a nozzle.

  The combustion type water quality analyzer of the present invention is provided with a dropping nozzle moving means for moving the dropping nozzle in the horizontal direction, and the dropping nozzle moving means moves the dropping nozzle in the horizontal direction or drops the sample water while moving it. By doing so, the position of the dropping point in the combustion section can be changed each time the dropping is performed. Therefore, the sample water is not continuously dripped at the same location, and the sample water is not dripped at the location where the temperature has dropped due to the previous dripping, so a local rapid temperature drop at the dropping point Does not occur. Therefore, according to the combustion-type water quality analyzer of the present invention, it is possible to prevent incomplete combustion of the target component accompanying a local rapid temperature drop at the dropping point.

  In the present invention, “moving the dropping nozzle in the lateral direction” means moving the dropping nozzle so that the position of the dropping nozzle changes when the dropping nozzle is viewed in plan. Therefore, the dripping nozzle may be moved along a horizontal plane, may be moved along an inclined surface, may be moved along another surface or line, and any mode is used as long as it does not move only up and down. You can move with. Particularly preferred is rotating or sliding the dropping nozzle along a horizontal plane.

  The combustion-type water quality analyzer of the present invention can perform incomplete water quality analysis by preventing incomplete combustion of the target component accompanying a local rapid temperature drop at the dropping point in the combustion section.

  Hereinafter, an example of the best mode for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic perspective view showing an example of a combustion section and a dropping section of a combustion-type water quality analyzer according to the present invention. In FIG. 1, 30 is a combustion part, 32 shows a dripping part. The combustion unit 30 is the same as that shown in FIG. That is, the catalyst filling layer 36 and the catalyst protection layer 38 are disposed inside the combustion pipe 34, and the heating unit 40 is provided around the combustion pipe 34.

  The dropping unit 32 fixes a rotating motor 44 to a base 42 installed on the combustion unit 30, fixes one end side of a disk-shaped rotating body 46 to a rotating shaft 45 of the rotating motor 44, and A dripping nozzle 48 is attached to the end side, and the dripping nozzle 48 and the sample water supply pipe 50 are connected within a rotating body 46. The rotating motor 44 and the rotating body 46 constitute a dropping nozzle moving means.

  In the dropping unit 32 of this example, when the rotating shaft 45 of the rotary motor 44 is rotated, the rotating body 46 is rotated, whereby the tip position of the dropping nozzle 48 is rotated along the horizontal plane. Therefore, the sample water 52 is dropped from the dropping nozzle 48 while the rotating body 46 is intermittently rotated by an arbitrary distance or continuously rotated by the operation of the rotation motor 44, so that the combustion unit 30. The position of the dropping point 54 can be changed every time the dropping is performed. In addition, the water quality analysis method by the combustion type water quality analyzer of this example is the same as that of the combustion type water quality analyzer of FIG.

(Second Embodiment)
FIG. 2 is a schematic perspective view showing another example of the combustion section of the combustion-type water quality analyzer according to the present invention. The dropping unit 62 of this example holds a slidable plate-like slide body 68 slidably between the support members 64 and 64 of a frame body 66 having a pair of parallel support members 64 and 64, and drops onto the slide body 68. The tip of the rod 72 of the air cylinder 74 that attaches the nozzle 70 and moves the rod 72 forward / backward by air flow is fixed to the slide body 68, and the drip nozzle 70 and the sample water supply pipe 76 are connected within the slide body 68. Thus, the dripping nozzle moving means is constituted by the frame 66, the slide body 68 and the air cylinder 74. In addition, the dripping part 62 of this example can be arrange | positioned above a heating part with an appropriate means.

  In the dropping unit 62 of this example, when the rod 72 of the air cylinder 74 is advanced and retracted, the slide body 68 slides in the front-rear direction, and thereby the tip position of the dropping nozzle 70 slides in the front-rear direction along the horizontal plane. Therefore, by dropping the sample water from the dropping nozzle 70 while the slide body 68 is slid intermittently at an arbitrary distance by the operation of the air cylinder 74 or continuously, the dropping in the combustion section is performed. The position of the point can be changed at each dropping. In addition, the water quality analysis method by the combustion type water quality analyzer of this example is the same as that of the combustion type water quality analyzer of FIG.

  The configuration of the dropping nozzle moving means is not limited to the above-described example, and other appropriate configurations can be adopted. For example, in the second embodiment, instead of the air cylinder 74, the slide body 68 may be slid by a rack 80 and a pinion 82 as shown in FIG.

  The combustion part and dripping part of embodiment mentioned above can be used as a combustion part and dripping part of a total organic carbon measuring apparatus of a structure as shown, for example in FIG. In FIG. 4, 100 is a sample water tank, 102 is a dilution water tank, 104 is an IC removal liquid tank, 106 is a dilution tank, 108 is a dropping part, 110 is a combustion part, 112 is a carrier gas supply means, 114 is a dehumidifier, and 116 is A detector (NDIR) is shown.

The total organic carbon measuring apparatus of this example mixes sample water, dilution water, and an IC removal solution (hydrochloric acid, etc.) in a dilution tank 106, thereby diluting the sample water and at the same time IC such as carbon dioxide contained in the sample water. After removing (inorganic carbon), sample water is dropped into the combustion section 110 by the dropping section 108 in a state where the carrier gas is supplied into the combustion section 110 by the carrier gas supply means 112. The droplets are heated and vaporized in the combustion unit 110, and organic substances in the vaporized gas are oxidized by the action of the catalyst and converted to CO ₂ . Then introduced into the detector 116 through the dehumidifier 114, by measuring the CO ₂ concentration in the gas, and requests organic carbon concentration in the sample water. The combustion part and dripping part of embodiment mentioned above can be used as the combustion part 110 and dripping part 108 of the total organic carbon measuring apparatus of this example.

It is a schematic perspective view which shows an example of the combustion part of the combustion type water quality analyzer which concerns on this invention, and a dripping part. It is a schematic perspective view which shows the other example of the combustion part of the combustion type water quality analyzer which concerns on this invention. It is a schematic perspective view which shows an example of a dripping nozzle moving means. It is a conceptual diagram which shows an example of a total organic carbon measuring apparatus. It is the schematic which shows the prior art example of the combustion part and dripping part of a combustion type water quality analyzer.

Explanation of symbols

30 Combustion unit 32 Drip unit 34 Combustion tube 36 Catalyst packed layer 38 Catalyst protective layer 40 Heating unit 44 Rotating motor 46 Rotating body 48 Drip nozzle 62 Drip unit 66 Frame body 68 Slide body 74 Air cylinder 80 Rack 82 Pinion

Claims (2)

  A combustion section for burning sample water inside and a dropping nozzle for sample water are provided, and droplets of sample water are dropped from the dropping nozzle into the combustion section, and the dropped droplets are burned in the combustion section. In the combustion-type water quality analyzer for measuring a component in the obtained gas, a dropping nozzle moving means for moving the dropping nozzle in the horizontal direction is provided, and the dropping nozzle is moved in the horizontal direction by the dropping nozzle moving means, or A combustion-type water quality measuring apparatus that drops sample water while moving. The combustion-type water quality measuring apparatus according to claim 1, wherein the dripping nozzle moving means rotates or slides the dripping nozzle along a horizontal plane.

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