JPS61268306A - Apparatus for making deaerated water - Google Patents

Abstract

PURPOSE:To obtain the titled apparatus for making a large amount of deaerated water with good efficiency, by providing a heating means for performing the deaeration of air dissolved in water, a cooling means for cooling deaerated hot water and a deaerated water storage means for storing deaerated water. CONSTITUTION:Raw water, from which impurities were removed by a pure water making apparatus 8, is preheated through a pump 9 and a first cooler 6 to be flowed in a heating deaeration tank 1 where heated to temp. of 80 deg.C-below b.p. by a heater. Deaerated hot water is flowed in the first cooler 6 to be subjected to the heat exchange with raw water and further flowed in a deaerated water storage tank 13 through a second cooler 7. The deaerated water in the storage tank 13 is held to predetermined temp. (37 deg.C) and always held to a fully filled state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a degassed water production device that removes dissolved gas from water.

[Technical background of the invention and its problems 1 Air components, that is, various gases such as nitrogen, oxygen, and carbon dioxide gas, are dissolved in water. When water is used for industrial or chemical purposes, the dissolved oxygen and the like may have an adverse effect.

For example, in boilers and the like, dissolved oxygen may oxidize the material of the kettle, resulting in holes.

Furthermore, in high-speed chromatography or biochemical automatic analyzers, the generation of air bubbles in the tube line causes errors in measurement data. Therefore, when considering the measurement accuracy of these analyzers, the deaeration of the water used has an important meaning.

As one method for removing dissolved gases from water, a method of degassing under reduced pressure (vacuum degassing method) is often used.

However, in general, when a large amount of water is degassed using the vacuum deaeration method, there is a problem that the deaeration efficiency rapidly decreases and a long time is required for deaeration.

Furthermore, since the above method involves batch processing, it is extremely difficult to use a continuous system, and a large amount of degassed water cannot be produced in a short period of time.

In recent years, as automatic chemical analyzers have become faster and larger,
Since the demand for large amounts of deaerated water is increasing, it is strongly desired to produce large amounts of deaerated water in a short time.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to provide a deaerated water production device that can efficiently produce a large amount of deaerated water. be.

[Summary of the Invention] The outline of the present invention for achieving the above object is to provide a degassed water production device that removes dissolved gases in water by heating the water to degas the dissolved gases in the water. The device is characterized by having an air means, a cooling means for cooling the hot water degassed from the degassing means, and a deaerated water storage means for storing the deaerated water from the cooling means.

[Embodiments of the invention] Hereinafter, the present invention will be specifically explained with reference to Examples.

FIG. 1 is an explanatory diagram of a degassed water production apparatus which is an embodiment of the present invention.

Reference numeral 1 denotes a heating deaeration tank which is a heating and deaeration means, and includes a heating heater 2 for heating supplied water, and a heating deaeration tank 1 for controlling the heating temperature or heating time of this heating heater 2. A temperature sensor 3 is attached to detect the temperature of the water inside. Gases degassed from the water, such as oxygen, nitrogen, carbon dioxide, etc., are discharged to the outside through the exhaust hole 4.

Reference numeral 5 denotes a cooling means for cooling the degassed water from the heating and degassing tank 1, and includes a first cooler 6 and a second cooler 7.

The first cooler 6 cools the degassed hot water by heat exchange between the degassed hot water from the heating deaeration tank 1 and the raw water (supply water) to be deaerated, and also preheats the raw water. It is something to do. After impurities are removed from the raw water by the pure water production device 8, it flows into the heating deaeration tank 1 via the pump 9 and the first cooler 6. The pump 9 is configured to operate according to the output of a water level sensor, which will be described later.

The second cooler 7 is for further cooling the degassed water cooled by the first cooler 6, and is structurally similar to the first cooler 6. Tap water flowing in through the valve 10 is used as the cooling water used for heat exchange. The opening/closing operation of the valve 10 is controlled by a valve opening/closing means 11 in accordance with the output of a temperature sensor 12 that detects the temperature of the deaerated water from the second gluer 7. Also, the second
The cooling water used for heat exchange in the cooler 7 is discharged to the outside.

A deaerated water storage tank 13 is a deaerated water storage means, and is used to store deaerated water from the second cooler 7. This degassed water storage tank 13 has a temperature sensor 14 that detects the temperature of the degassed water in the tank, and the temperature of the degassed water in the tank is controlled within a predetermined range, for example, 37° C. A heat-retaining heater 15 for maintaining the temperature at 40°C, a cover 16 that tightly contacts the surface of the deaerated water, and a water level sensor 1 that detects the level of the deaerated water.
7.

The cover 16 is made of, for example, styrofoam, and serves to block the surface of the degassed water from air in order to prevent gas from entering the degassed water.

Further, the output of the water level sensor 17 is used to control the drive of the pump 9.

Reference numeral 18 denotes a degassed water supply valve, and the degassed water is supplied through the degassed water supply valve 18 into, for example, a reaction tank in an automatic chemical analyzer (not shown). 19 is a discharge valve.

Next, the operation of the embodiment device having the above configuration will be explained.

The raw water from which impurities have been removed by the pure water production device 8 is preheated via the pump 9 and the first cooler 6, and then flows into the heating deaeration tank 1. The water that has flowed in is heated to 80° C. or higher by the heater 2 in the heating and degassing tank 1 . Then, the gas contained in the water is released, and the released gas is exhausted to the outside through the exhaust hole 4. Here, the relationship between the outlet water temperature of the heating deaeration tank 1 and Do (dissolved oxygen amount) is as shown in FIG.

FIG. 2 is a characteristic diagram showing the relationship between water temperature and Do. As is clear from the figure, the dissolved concentration of gases contained in raw water is inversely proportional to the water temperature, and the DO at water temperatures of 80°C or higher is approximately 5.
ppm or less.

By the way, in automatic chemical analyzers, etc., temperatures of 20℃~
Water is often used at a temperature of 37°C, but the raw water supplied there is usually lower than 37°C and has a concentration of 10 ppm.
There are Do before and after. Since the amount of saturated dissolved oxygen at a water temperature of 37°C is 6.91111 m, it is natural that when raw water of around 10ρρ1 is heated to 37°C, the dissolved gas becomes supersaturated and bubbles are generated.

However, do 5ppm in advance! If the water temperature is lowered to 37° C., the dissolved gas will not become supersaturated, and no bubbles will be generated.

From the above, when producing degassed water to be supplied to an automatic chemical analyzer, the heating temperature in the heating deaeration tank 1 is set at 80°C.
It is sufficient to set the temperature above the boiling point.

The water temperature in the heating deaeration tank 1 is kept approximately constant because it is feedback-controlled by the output of the temperature sensor 3.

The degassed hot water from the heating deaeration tank 1 flows into the first cooler 6 and is subjected to heat exchange with the raw water from the pure water production apparatus. Due to this heat exchange, the temperature of the raw water increases to a certain extent, so that the heating efficiency of the heating deaeration tank 1 can be improved. On the other hand, the degassed hot water from the heating and deaeration tank 1 is cooled and flows into the deaeration storage wall 13 via the second cooler 7.

If the temperature of the degassed water flowing out from the second cooler 7 has not decreased to a predetermined temperature (for example, 37° C.), the valve opening/closing means 11 operates according to the detection result of the temperature sensor 12, and the valve 10 will be held. Then, the tap water flows into the second cooler 7, and this water flow causes the first
The degassed water from the cooler 6 will be further cooled. Furthermore, as a matter of course, if the temperature of the raw water from the pure water production device 8 is low and cooling only by the first cooler 6 is sufficient, the second cooler 7 is not necessary.

The degassed water in the degassed water storage tank 13 is maintained at a predetermined temperature (for example, 37° C.) because the operation of the heat-retaining heater 14 is feedback-controlled by the output of the temperature sensor 14. When the amount of deaerated water in the deaerated water storage tank 13 decreases to below a predetermined water level, the pump 9 operates according to the output of the water level sensor 17, and the raw water from the pure water production device 8 is pumped into the heated deaerate tank 1. is flowing into the country. Then, the degassed hot water corresponding to the amount of raw water that has flowed in flows out from the heating deaeration tank 1. Second cooler6.
7 into the deaerated water storage tank 13.

Due to the above automatic control, the degassed water storage tank 13 is always kept full of water, so that a large amount of degassed water can be rapidly supplied to an external device, such as an automatic chemical analyzer. Furthermore, by keeping the degassed water in the degassed water storage tank 13 at a predetermined temperature, the heating time for constant temperature water (degassed water) in the automatic chemical analyzer can be significantly shortened.

The results of the example apparatus described above are shown in the table below.

In the deaerated water storage tank 13, a cover 16 is provided on the surface of the deaerated water in the tank to isolate it from the air, so that the increase in DO is extremely small even when the device is used at night.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above-mentioned embodiment, and can be modified as appropriate within the scope of the gist of the present invention.

In the above embodiment, a case has been described in which the produced degassed water is supplied to an automatic chemical analyzer, but it goes without saying that it can be supplied to other apparatuses.

At this time, the cooling side heat retention temperature, etc. may be set in consideration of the temperature at which deaerated water is used in other devices.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to efficiently produce human-sized deaerated water using a continuous system, and it is possible to quickly supply the produced deaerated water to the outside. It is possible to provide a deaerated water production device that can produce degassed water.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a degassed water production apparatus according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram showing the relationship between the outlet water temperature of the heating deaeration tank 1 and the amount of dissolved oxygen in the apparatus of this embodiment. . 1... Heating deaeration tank (heating deaeration means), 5... Cooling means, 6... First cooler, 7... Second cooler, 13... Deaerated water storage tank, 15... Heater for heat retention,
16...Cover.

Claims (5)

[Claims] (1) In a deaerated water production device that removes dissolved gases from water, there is a heating deaeration means that deaerates dissolved gases from water by heating the water, and the degassed hot water from this deaeration means is cooled. 1. A degassed water production apparatus comprising: a cooling means for cooling the water; and a deaerated water storage means for storing the degassed water from the cooling means. (2) The degassed water production device according to claim 1, wherein the heating temperature in the heating and degassing means is 80° C. or higher. (3) The cooling means cools the degassed hot water by heat exchange between the degassed hot water degassed by the heating deaerator and the supplied water to be deaerated by the heating deaerator. The degassed water production device according to claim 1 or 2, which has a cooler. (4) The deaerated water storage means has a cover that is in close contact with the surface of the deaerated water to be stored.
The degassed water production apparatus according to any one of items 1 to 3. (5) The degassed water production device according to any one of claims 1 to 4, wherein the degassed water storage means has a heat-retaining heater that keeps the stored degassed water at a predetermined temperature. .