JP2003154241A - Method and apparatus for dissolving solid chemical - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for dissolving a solid chemical, which enable simple and stable management of the concentration of the solid chemical, and an apparatus. SOLUTION: The solid chemical is stored in a water-permeable vessel 202. A dissolving liquid is supplied to the vessel 202. The solid chemical is dissolved in the supplied dissolving liquid. The solid chemical-containing dissolving liquid is made to flow in a water circulating system 100. The amount of the dissolving liquid to be supplied to the vessel 202 is controlled according to the monitored concentration of the solid chemical in the system 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for dissolving a solid medicine which can be used mainly in a cooling water system.

[0002]

2. Description of the Related Art Conventionally, in a circulating water system for circulating cooling water,
Generally, water treatment agents are used. Such water treatment agents are used to prevent scale, slime, or corrosion damage from occurring in cooling water. Such water treatment agents include liquid type and solid type. Here, the liquid medicine has a problem of leakage, and it is necessary to take measures against leakage. Further, the solid drug had a non-uniform dissolution rate, which made it difficult to control the concentration, and the handling thereof was complicated.

[0003]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method and apparatus for dissolving a solid drug capable of easily and stably controlling the concentration of the solid drug. To aim.

[0004]

In order to achieve the above object, a method for dissolving a solid drug according to the present invention is to store the solid drug in a water-permeable container and supply the solution to the container. Then
The solid drug is dissolved by the supplied dissolution liquid, the dissolution liquid containing the solid drug is caused to flow into the circulating water system, the concentration of the solid drug in the circulating water system is monitored, and the above-mentioned container is determined according to the concentration of the solid drug. It is characterized in that the supply state of the solution to the control unit is controlled. Here, as the means for monitoring the solid drug concentration, a means for measuring the redox potential can be mentioned.

As the water-permeable container, it is preferable to use a box-shaped container using a mesh member. As the solid drug, scale inhibitor, anticorrosive,
It is preferable to use one or more of the slime control agent and the defoaming agent.

[0006] In another aspect, the present invention is a solid medicine dissolving apparatus, which is a water-permeable container for storing a solid medicine and a solution supply for supplying a dissolving solution into the container. Means, 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 controlling the supply state of the solution to the container based on the information from the monitoring means. And a dissolution liquid control means for controlling. Here, as the means for monitoring the solid drug concentration, a means for measuring the redox potential can be mentioned.

Similar to the above-mentioned dissolution method, preferably, the water-permeable container is formed in a box shape using a mesh member. Further, it is preferable to install any one or more of a scale inhibitor, an anticorrosive agent, a slime control agent, and an antifoaming agent as the above-mentioned solid medicine.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The method and apparatus for dissolving a solid medicine according to the present invention will be described in more detail below with reference to the embodiments shown in the accompanying drawings. FIG. 1 shows a cooling water circulation system including an embodiment of a solid medicine dissolving apparatus according to the present invention. This circulation system consists of the circulating water system body 1
00 and a drug supply system 200.

The circulating water system body 100 includes a heat exchanger 102 and a cooling water circulating pump 104. Circulating water system body 100
Constitutes a cooling water system for circulating cooling water from the cooling tower 106 to the heat exchanger 102. The object to be cooled by the circulating cooling water may be a compression refrigerator, an absorption refrigerator, a compressor, or the like. However, it is not particularly limited to these.

The drug supply system 200 comprises a water-permeable container 20.
2, submersible pump 204, redox electrometer (hereinafter, ORP
206) and a concentration control device 208.

The water-permeable container 202 is for accommodating a solid medicine. It is generally preferable that the container 202 is formed in a box shape by using a mesh member. However, as long as it does not deviate from the object of the present invention, it may be cylindrical, prismatic, net bag-shaped, etc., and is not limited to a box shape. Further, as long as it is water-permeable, a member other than the mesh-like member which is a porous member and which is not discharged before the installed solid medicine is dissolved can be adopted. Further, the material of such a member itself is made of a material that is not corroded by the installed solid chemical. Therefore, it is generally preferable to use resin or plastic, although it depends on the solid medicine to be installed.

The solid chemical agent placed in the water-permeable container 202 is any one or more of scale inhibitor, anticorrosive agent, slime control agent, and defoaming agent. Specifically, trichloroisocyanuric acid, chloroisocyanuric acid compounds such as sodium dichloroisocyanurate,
A solid medicine obtained by tableting any one or more of calcium hypochlorite is preferable. In addition, as long as it is not against the object of the present invention, scale in cooling water, slime, or solid agents used to prevent the occurrence of corrosion damage, is not limited to these, and each You may mix and use the tablet-forming medicine of a chemical | medical agent.

The submersible pump 204 is the water-permeable container 2 described above.
Reference numeral 02 constitutes a solution supply means for supplying a solution. The solution is the cooling water itself circulated by the circulating water system body 100. However, in addition to the dissolution liquid supplied by the submersible pump 204 as described above, a dissolution liquid (generally water) may 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 controlled by the ORP by grasping the relationship between the oxidizing agent concentration and the ORP.

In this sense, the ORP meter 206 constitutes a monitoring means 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 is
The detection part is brought into contact with the water system, and the circulating water system, that is, the stored water 1
The solid drug concentration in 08 is detected. In this embodiment,
The ORP meter 206 is used. However, the DPD (N, N-diethylphenylenediamine) method, the polarographic method, and the like can be adopted in addition to the above, depending on the type of the solid drug to be measured, unless the object of the present invention is violated. It is not limited to this. In addition, a plurality of densitometers may be used together depending on the case.

The concentration control device 208 constitutes a dissolution liquid control means for controlling the supply state of the dissolution liquid to the container 202 based on the information (detection signal) from the ORP meter 206. The concentration control device 208 is generally a computer device, and based on a detection signal from the ORP meter 206, sends a control signal to the submersible pump 204 to maintain its operating state properly. As for the configuration of the concentration control device 208, the software for operating the concentration control device 208, the control procedure, and the like, those known to those skilled in the art can be adopted as long as they do not conflict with the object of the present invention. Control methods include feedback control, feedforward control, fuzzy control, etc.
As long as it is not against the object of the present invention, those known to those skilled in the art can be adopted.

Next, the operation of the cooling water circulation system including the embodiment of the solid medicine dissolving apparatus having the above-described structure will be described to explain the solid medicine dissolving method according to the present invention. The form of will be described.

In the circulating water system body 100, cooling water is sent from the stored water 108 to the heat exchanger 102 by the cooling water circulation pump 104. In the heat exchanger 102, heat is exchanged,
The object to be cooled is cooled. The cooling water that has passed through the heat exchanger 102 is returned from the upper part of the cooling tower 106 into the cooling tower 106. By repeating such a procedure, the cooling water is circulated. In such a cooling water circulation system, it is necessary to prevent the occurrence of scale, slime, or corrosion damage. Further, a blower 110 is provided above the cooling tower 106,
The cooling water is cooled by discharging the air (including water vapor) in the cooling tower 106.

On the other hand, in the chemical supply system 200, a part of the stored water 108 is sent as a solution from the submersible pump 204 to the water permeable container 202. As described above, the solid medicine is installed in the container 202, and the supplied dissolution liquid dissolves part of the solid medicine. The solution containing the solid medicine is delivered from the container 202 and becomes a part of the stored water 108.

Here, the ORP meter 206 monitors and detects the solid chemical concentration of 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 medicine is maintained at the set value. Taking feedback control as an example, when the concentration is judged to be too high, the supply water amount is reduced, and when it is judged to be too low, the supply water amount is increased. In this way, the concentration of the solid drug can be controlled easily and stably, and the occurrence of scale, slime, or corrosion damage can be prevented. The set concentration of the solid medicine is set according to the type of solid medicine used and the properties of the cooling water itself.

[0020]

EXAMPLES Examples 1 and 2 A test was conducted under the following conditions using the apparatus outlined in FIG. Cooling tower scale: 100 RT Solid drug: sodium trichloroisocyanurate was used. Concentration measurement method: An ORP meter was used. Measurement of slime adhesion amount: by a rubber plate method. In this method, a rubber plate having a size of 3 cm × 5 cm × 1 mm was used, and the plate was placed in stored water to directly measure the amount of slime adhered.

In Example 1, 3 kg of sodium trichloroisocyanurate was filled in a box-shaped reticulated water-permeable container 202, and the residual chlorine concentration was 0.3 mg / L (40 in ORP).
(Corresponding to 0 mV). Table 1 shows changes in the residual chlorine concentration in the circulating water system. In Example 2, 6 kg of sodium trichloroisocyanurate, Example 1
The same water-permeable container 202 as above was filled with the residual chlorine concentration of 0.
It was set to be 3 mg / L. Table 1 shows changes in the residual chlorine concentration in the circulating water system. As shown in Table 1, it was understood that both Examples 1 and 2 could stably maintain the residual chlorine concentration in the circulating water and the sodium trichloroisocyanurate concentration for one month. It

Comparative Examples 1 and 2 Tests were conducted under the following conditions using the apparatus outlined in FIG. Cooling tower scale: 100 RT Solid drug: sodium trichloroisocyanurate was used. Concentration measurement: The concentration was not controlled, and the solid medicine was simply put in the same container as in Example 1 and immersed in the pit. Measurement of slime adhesion amount: by a rubber plate method. In this method, a rubber plate having a size of 3 cm × 5 cm × 1 mm was used, and the plate was placed in stored water to directly measure the amount of slime adhered.

In Comparative Example 1, 3 kg of sodium trichloroisocyanurate and the same water-permeable container 20 as in Example 1 were used.
Filled to 2. Table 1 shows changes in residual chlorine concentration in the circulating water system
Shown in. 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 changes in the 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]

Other Embodiments The method and apparatus for dissolving a solid medicine according to the present invention have been described in the above embodiments, but the present invention is not limited to such embodiments. All modifications, changes and additions that are obvious to those skilled in the art are included in the technical scope of the present invention. For example, although the embodiment of FIG. 1 described above is used in an open circulation cooling water system, it can also be used in an organic exhaust gas scrubber water system.

[0026]

As is apparent from the above, 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 drawings]

FIG. 1 is a conceptual diagram illustrating a cooling water circulation system including an embodiment of a solid medicine dissolving apparatus according to the present invention.

[Explanation of symbols]

100 Circulating water system body 102 heat exchanger 104 Cooling water circulation pump 106 cooling tower 108 stored water 110 blower 200 drug supply system 202 Water-permeable container 204 Submersible pump 206 Redox potentiometer 208 Concentration control device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 1/50 531 C02F 1/50 531P 532 532D 540 540C 550 550L 1/76 1/76 A 5/00 610 5/00 610G 5/06 5/06 5/12 5/12 5/12 (72) Inventor Kazuhiko Kakuda 3-4-7 Nishi-Shinjuku, Shinjuku-ku, Tokyo F-Term (reference) within Kurita Industry Co., Ltd. 4D050 AA08 AB06 BB06 BD03 BD08 4G035 AA25 AE01 4G037 BA05 BC03 BD06 EA10

Claims (6)

[Claims] 1. A solid medicine is housed in a water-permeable container, a dissolution liquid is supplied to the container, the solid medicine is dissolved by the supplied dissolution liquid, and a dissolution liquid containing the solid medicine is circulated. The solid drug concentration of the solid drug is made to flow into the water system, the concentration of the solid drug in the circulating water system is monitored, and the supply state of the solution to the container is controlled according to the solid drug concentration. Dissolution method. 2. The method for dissolving a solid drug according to claim 1, wherein an oxidation-reduction potential measuring device is used as the solid drug concentration monitoring device. 3. The scale medicine as the solid medicine,
The method for dissolving a solid medicine according to claim 1 or 2, wherein any one or more of an anticorrosive agent, a slime control agent, and an antifoaming agent is used. 4. A water-permeable container for containing a solid medicine, a solution supply means for supplying a solution into the container, and a solid solution in a circulating water system into which the solution containing a fixed medicine flows. A solid mold characterized by including monitoring means for monitoring the concentration of the type drug and dissolution liquid control means for controlling the supply state of the dissolution liquid to the container based on information from the monitoring means. Drug dissolution device. 5. The solid medicine dissolving device according to claim 4, wherein a redox potential measuring means is used as the means for monitoring the solid medicine concentration. 6. The scale medicine as the solid medicine,
The method for dissolving a solid medicine according to claim 4 or 5, wherein any one or more of an anticorrosive agent, a slime control agent, and an antifoaming agent is installed.