JP3759583B2 - Method and apparatus for dissolving solid drug - Google Patents

Description

【００２５】
他の実施の形態
本発明に係る固型薬剤の溶解方法及び装置は、上記の実施の形態について説明したが、本発明は、このような実施の形態に限定されるものではなく、当業者にとって自明な修飾・変更・付加は、全て本発明の技術的範囲に含まれる。
例えば、上記図１の実施の形態は、開放循環冷却水系で用いているが、有機性排ガススクラバー水系で用いることもできる。
【００２６】
【発明の効果】
上記したところから明らかなように、本発明によれば、固型薬剤の濃度管理を簡便かつ安定に行うことができるようにした固型薬剤の溶解方法及び装置が提供される。
【図面の簡単な説明】
【図１】本発明に係る固型薬剤の溶解装置の一実施の形態を含む冷却水の循環システムを説明する概念図である。
【符号の説明】
１００ 循環水系本体
１０２ 熱交換器
１０４ 冷却水循環ポンプ
１０６ 冷却塔
１０８ 貯留水
１１０ 送風機
２００ 薬剤供給系
２０２ 透水性の容器
２０４ 水中ポンプ
２０６ 酸化還元電位計
２０８ 濃度制御装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for dissolving a solid drug that can be used mainly in a cooling water system.
[0002]
[Prior art]
Conventionally, a water treatment chemical is generally used in a circulating water system for circulating cooling water. Such water treatment chemicals are used to prevent the occurrence of scale, slime, or corrosion damage in cooling water. Such water treatment chemicals include liquid type and solid type. Here, the liquid type medicine has a problem of leakage, and it is necessary to take measures against leakage. In addition, the solid drug has a non-uniform dissolution rate, is difficult to control the concentration, and is difficult to handle.
[0003]
[Problems to be solved by the invention]
In view of the above circumstances, an object of the present invention is to provide a solid drug dissolution method and apparatus capable of easily and stably controlling the concentration of a solid drug.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a method for dissolving a circulating cooling water type solid medicine having a cooling tower, wherein the solid medicine is accommodated in a water-permeable container in the cooling tower and dissolved in the container. Supply the solution, dissolve the solid drug with the supplied solution, flow the solution containing the solid drug into the circulating water system, monitor the solid drug concentration in the circulating water system, and adjust the solid drug concentration to Accordingly, the supply state of the solution to the container is controlled. Here, as the solid drug concentration monitoring means, a redox potential measuring means can be exemplified.
[0005]
As the water-permeable container, it is preferable to use a container configured as a box shape using a net-like member. As said solid chemical | medical agent, it is suitable to use any one or two or more among a scale inhibitor, an anticorrosive, a slime control agent, and an antifoamer.
[0006]
Further, in another aspect, the present invention is a solid drug dissolving apparatus, and in a circulating cooling water-based solid drug dissolving apparatus having a cooling tower, the water permeability for storing the solid drug in the cooling tower . , A solution supply means for supplying the solution into the container, a monitoring means for monitoring the concentration of the solid drug in the circulating water system into which the solution containing the fixed drug flows, and the monitoring means And a solution control means for controlling the supply state of the solution to the container based on the information from the above. Here, as the solid drug concentration monitoring means, a redox potential measuring means can be exemplified.
[0007]
Similar to the above-described dissolution method, the water-permeable container is preferably configured as a box shape using a net-like member. Moreover, as said solid chemical | medical agent, it is suitable to install any one or two or more among a scale inhibitor, an anticorrosive, a slime control agent, and an antifoamer.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the solid drug dissolving method and apparatus according to the present invention will be described in more detail with reference to embodiments shown in the accompanying drawings.
FIG. 1 shows a cooling water circulation system including an embodiment of a solid drug dissolving apparatus according to the present invention.
This circulation system includes a circulation water system main body 100 and a medicine supply system 200.
[0009]
The circulating water system main body 100 includes a heat exchanger 102 and a cooling water circulation pump 104. The circulating water system main body 100 constitutes a cooling water system for circulating the cooling water from the cooling tower 106 to the heat exchanger 102. Examples of the object cooled by the circulating cooling water include a compression refrigerator, an absorption refrigerator, and a compressor. However, it is not particularly limited to these.
[0010]
The drug supply system 200 includes a water-permeable container 202, a submersible pump 204, an oxidation-reduction potentiometer (hereinafter also referred to as an ORP meter) 206, and a concentration control device 208.
[0011]
The water-permeable container 202 is for storing a solid medicine. In general, the container 202 is preferably configured in a box shape using a net-like member. However, as long as it is not contrary to the object of the present invention, it may be cylindrical, prismatic, mesh bag, etc., and is not limited to a box shape. Moreover, as long as it is water-permeable, it can employ | adopt as long as it is a porous member besides the net shape, and is not discharged | emitted before the solid chemical | medical agent to be installed is melt | dissolved. Moreover, the material of such a member itself is comprised with the material which is not corroded by the solid chemical | medical agent installed. Accordingly, it is generally preferable to use a resin or plastic, although it varies depending on the solid drug to be installed.
[0012]
As a solid chemical | medical agent installed in the water-permeable container 202, it is any one or two or more among a scale inhibitor, an anticorrosive, a slime control agent, and an antifoamer. Specifically, a solid drug obtained by tableting and molding one or more of chloroisocyanuric acid compounds such as trichloroisocyanuric acid and sodium dichloroisocyanurate, and calcium hypochlorite is preferable. As long as it is not contrary to the object of the present invention, it is not limited to these as long as it is a solid chemical used for preventing the occurrence of scale, slime, or corrosion failure in cooling water, You may mix and use the tableting chemical | medical agent of a chemical | medical agent.
[0013]
The submersible pump 204 constitutes a solution supply means for supplying the solution to the water-permeable container 202. The solution is the cooling water itself circulated by the circulating water system main body 100. However, in addition to the solution supplied by the submersible pump 204 as described above, a solution (generally water) can be supplied from the outside. As the drug concentration monitoring means, if the drug to be used is an oxidizing agent, the concentration can be managed by the ORP by grasping the relationship between the oxidizing agent concentration and the ORP.
[0014]
In this sense, the ORP meter 206 constitutes a monitoring unit for monitoring the concentration of the solid drug in the circulating water system into which the solution containing the solid drug flows. The ORP meter 206 makes the detection unit contact the water system, and detects the concentration of the solid drug in the circulating water system, that is, the stored water 108. In this embodiment, an ORP meter 206 is used. However, as long as the object of the present invention is not violated, other methods such as DPD (N, N-diethylphenylenediamine) method, polarographic method, etc. can be adopted depending on the type of solid drug to be measured. However, the present invention is not limited to this. In some cases, a plurality of densitometers may be used in combination.
[0015]
The concentration control device 208 constitutes a solution control means for controlling the supply state of the solution to the container 202 based on information (detection signal) from the ORP meter 206. The concentration control device 208 is generally a computer device, and sends a control signal to the submersible pump 204 based on the detection signal from the ORP meter 206 to keep its operating state properly. As the configuration of the density control device 208, software for causing it to function, control procedures, and the like, those known to those skilled in the art can be employed as long as they do not contradict the purpose of the present invention. As a control method, a method known to those skilled in the art can be employed as long as it does not contradict the object of the present invention, such as feedback control, feedforward control, and fuzzy control.
[0016]
Next, the operation of the cooling water circulation system including one embodiment of the solid drug dissolution apparatus having the above-described configuration will be described to explain one embodiment of the solid drug dissolution method according to the present invention. explain.
[0017]
In the circulating water system main body 100, the cooling water is sent from the stored water 108 to the heat exchanger 102 by the cooling water circulation pump 104. The heat exchanger 102 performs heat exchange and cools the object to be cooled. The cooling water that has passed through the heat exchanger 102 is returned into the cooling tower 106 from the upper part of the cooling tower 106. Such a procedure is repeated to circulate the cooling water. In such a cooling water circulation system, it is necessary to prevent the occurrence of scale, slime, or corrosion failure.
In addition, a blower 110 is provided above the cooling tower 106, and the cooling water is cooled by discharging the air (including water vapor) in the cooling tower 106.
[0018]
On the other hand, in the medicine supply system 200, a part of the stored water 108 is sent from the submersible pump 204 to the water-permeable container 202 as a solution. As described above, the solid drug is installed in the container 202, and a part of the solid drug is dissolved by the supplied solution. The solution containing the solid drug is delivered from the container 202 and becomes a part of the stored water 108.
[0019]
Here, the ORP meter 206 monitors and detects the solid drug concentration in the stored water 108. The concentration signal of the solid medicine is sent to the concentration controller 208. The concentration control device 208 controls the operating state of the submersible pump 204 so that the concentration of the solid drug is maintained at a set value. Taking feedback control as an example, if it is determined that the concentration is too high, the amount of supplied water is decreased, and if it is determined that the concentration is too low, the amount of supplied water is increased.
In this way, the concentration control of the solid drug can be performed easily and stably, and the occurrence of scale, slime, or corrosion failure can be prevented.
The set concentration of the solid medicine is set according to the type of the solid medicine to be used and the properties of the cooling water itself.
[0020]
【Example】
Examples 1 and 2
The test was performed using the apparatus outlined in FIG. 1 under the following conditions.
(1) Cooling tower scale: 100RT
(2) Solid drug: Sodium trichloroisocyanurate was used.
(3) Concentration measuring method: An ORP meter was used.
(4) Measurement of slime adhesion amount: According to rubber plate method. In this method, a rubber plate having a size of 3 cm × 5 cm × 1 mm was used, and this was put in stored water, and the amount of slime adhered was directly measured.
[0021]
In Example 1, 3 kg of sodium trichloroisocyanurate was filled into a box-type net-like water-permeable container 202, and the residual chlorine concentration was set to 0.3 mg / L (corresponding to 400 mV in ORP). Table 1 shows the transition of residual chlorine concentration in the circulating water system.
In Example 2, 6 kg of sodium trichloroisocyanurate was filled in the same water-permeable container 202 as in Example 1, and the residual chlorine concentration was set to 0.3 mg / L. Table 1 shows the transition of residual chlorine concentration in the circulating water system.
As shown in Table 1, it was understood that both Examples 1 and 2 were able to maintain the residual chlorine concentration in the circulating water stably for one month and maintain the concentration of sodium trichloroisocyanurate. The
[0022]
Comparative Examples 1 and 2
The test was performed using the apparatus outlined in FIG. 1 under the following conditions.
(1) Cooling tower scale: 100RT
(2) Solid drug: Sodium trichloroisocyanurate was used.
(3) Concentration measurement: Concentration control was not performed, and the solid drug was simply placed in the same container as in Example 1 and immersed in a pit.
(4) Measurement of slime adhesion amount: According to rubber plate method. In this method, a rubber plate having a size of 3 cm × 5 cm × 1 mm was used, and this was put in stored water, and the amount of slime adhered was directly measured.
[0023]
In Comparative Example 1, 3 kg of sodium trichloroisocyanurate was filled in the same water-permeable container 202 as in Example 1. Table 1 shows the transition of residual chlorine concentration in the circulating water system.
In Comparative Example 2, 6 kg of sodium trichloroisocyanurate was filled in the same water-permeable container 202 as in Example 1. Table 1 shows the transition of residual chlorine concentration in the circulating water system.
As shown in Table 1, in both Comparative Examples 1 and 2, the residual chlorine concentration could not be stably maintained.
[0024]
[Table 1]

[0025]
Other Embodiments Although the solid drug dissolving method and apparatus according to the present invention have been described with respect to the above-described embodiments, the present invention is not limited to such embodiments, and those skilled in the art will understand. All obvious modifications, changes and additions are included in the technical scope of the present invention.
For example, although the embodiment of FIG. 1 is used in an open circulation cooling water system, it can also be used in an organic exhaust gas scrubber water system.
[0026]
【The invention's effect】
As is apparent from the above description, according to the present invention, there is provided a method and an apparatus for dissolving a solid drug, which enables simple and stable concentration control of the solid drug.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram illustrating a cooling water circulation system including an embodiment of a solid drug dissolving apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Circulating water system main body 102 Heat exchanger 104 Cooling water circulation pump 106 Cooling tower 108 Reservation water 110 Blower 200 Chemical supply system 202 Water-permeable container 204 Submersible pump 206 Oxidation reduction potential meter 208 Concentration control apparatus

Claims (6)

In a method for dissolving a solid drug in a circulating cooling water system having a cooling tower,
The solid drug is stored in a water-permeable container in the cooling tower ,
Supply the solution into the container,
Dissolve the solid drug with the supplied solution,
Let the solution containing the solid drug flow into the circulating water system,
Monitoring the concentration of solid drug in the circulating water system;
A solid drug dissolution method, wherein the supply state of the solution to the container is controlled in accordance with the solid drug concentration.   2. The solid drug dissolution method according to claim 1, wherein a redox potential measuring means is used as the solid drug concentration monitoring means.   The method for dissolving a solid drug according to claim 1 or 2, wherein one or more of a scale inhibitor, an anticorrosive, a slime control agent, and an antifoaming agent are used as the solid drug. In an apparatus for dissolving a solid drug in a circulating cooling water system having a cooling tower,
A water-permeable container for storing the solid drug in the cooling tower ;
A solution supply means for supplying the solution into the container;
A monitoring means for monitoring the concentration of the solid drug in the circulating water system into which the solution containing the fixed drug flows,
A solid-solution dissolving apparatus comprising: a dissolution liquid control means for controlling a supply state of the dissolution liquid to the container based on information from the monitoring means.   5. The solid medicine dissolving apparatus according to claim 4, wherein an oxidation-reduction potential measuring means is used as said solid medicine concentration monitoring means.   6. The method for dissolving a solid drug according to claim 4, wherein any one or more of a scale inhibitor, an anticorrosive, a slime control agent, and an antifoaming agent are installed as the solid drug.

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