JPH044039B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid drug dissolving device, and more particularly to a solid drug dissolving device for quantitatively dissolving inorganic or organic chlorinated tablets.

Domestic wastewater, industrial wastewater, swimming pool circulating water, bath circulating water, etc. are sterilized using chlorinating agents, such as inorganic chlorinating agents such as calcium hypochlorite compositions, and organic chlorinating agents such as trichloroisocyanuric acid. After disinfection, it is generally discharged or recycled. In these water treatment methods, in order to effectively sterilize treated water, it is required to dissolve a chlorinating agent quantitatively into the treated water in accordance with the amount of treated water and the amount of chlorine required. . Conventionally, as a method for dissolving and adding solid tablets of chlorinating agents into treated water, there has been a method in which the treated water is forced to flow through a drug dissolving tank filled with solid drugs and the drugs are dissolved in the treated water (Japanese Patent Publication No. 45-29788). (see publication), a method in which a drug dissolving tank filled with solid drugs with a slit at the bottom is set upright in the treated water at a certain depth, and the drug is dissolved by the treated water flowing into the drug dissolving tank through the slit (actual method). Publication No. 5242, Actual Publication No. 55-55198
(Refer to the Publication No., etc.) etc. are generally adopted. However, in these methods, since the solid drug is constantly immersed in the treatment water, swelling of the drug is likely to occur, and as a result, the drug collapses under the load of the drug itself, resulting in a phenomenon in which an excessive amount of the drug flows out into the treatment water. In addition, solid drugs form bridges in the drug dissolution tank and do not fall to the position where they are immersed in the treated water, causing a phenomenon in which they are no longer dissolved at all.
It has been difficult to obtain a stable and quantitative amount of drug dissolved.

SUMMARY OF THE INVENTION An object of the present invention is to provide a solid drug dissolving device that prevents swelling of solid drugs and can obtain a quantitative amount of dissolved drug.

As a result of intensive research to achieve the above object, the present inventors filled the perforated plate of a drug dissolution tank with a perforated plate above the water surface of drug-dissolving water with a solid drug, and directed the supplied water upward from the upper part of the perforated plate. The present invention was completed based on the discovery that a fixed amount of drug dissolved can be obtained depending on the amount of water sprayed, and that the amount of drug dissolved is proportional to the amount of water sprayed. The present invention
A drug dissolving tank 1 filled with solid drug A, a main pipe 2 for treated water B, a pipe 3 for supply water C to the drug dissolving tank 1,
and a pipe 4 for drug-dissolving water D that connects the drug-dissolving tank 1 and the main pipe 2. 5. Spray nozzle 6 that sprays supply water upward onto the top of perforated plate 5; solid drug A;
Inlet 7, gas outlet 8, and supply water piping 3
This is a solid drug dissolving device characterized by having a connecting nozzle for a drug dissolving water pipe 4.

The present invention will be explained in detail using FIG. 1 showing one embodiment of the present invention.

In the present invention, the drug dissolving tank 1 is configured such that when the solid drug A is put into the drug dissolving tank 1, the solid drug A
A perforated plate 5 holds the filling layer so that it is above the liquid level of the drug-dissolved water in the drug dissolution tank 1, a spray nozzle 6 that sprays the supply water C upward onto the upper part of the perforated plate 5, and a solid drug A. It consists of an input port 7 for filling the drug dissolution tank 1, a gas outlet 8 for decomposed gas generated by decomposition of the solid drug A, and a connecting nozzle for the pipe 3 for the supply water C and the pipe 4 for extracting the drug dissolution water D. A pipe 3 for supply water C and a pipe 4 for drug-dissolved water D are connected. The other end of the pipe 4 for drug-dissolved water D is connected to the main pipe 2 for treated water C. The main body of the drug dissolving tank 1 is usually cylindrical, but depending on conditions such as the installation location, it can also be a rectangular cylinder with a polygonal cross section such as a square. For the perforated plate 5, a perforated plate, a slit plate, an expanded metal, a wire mesh, or the like is used, which has an opening degree that prevents the solid drug A from falling through the openings when the solid drug A is filled in the upper part thereof. When using a perforated plate, the hole diameter is 3 to 10
A perforated plate with a hole pitch of 4.5 to 20 mm is preferably used. The spray nozzle 6 is a fully removable type spray nozzle that is attached upward so that the supply water C is sprayed over the entire cross-section of the drug dissolving tank 1. The number of spray nozzles 6 to be installed varies depending on the cross-sectional shape and cross-sectional area of the drug dissolving tank 1, but is preferably 1 to 6. Moreover, for simplicity, instead of the spray nozzle 6, a pipe having a large number of small holes provided on the upper side may be used. In the present invention, the solid drug A is regularly or irregularly filled into the upper part of the perforated plate 5 of the drug dissolving tank 1 through the solid drug inlet 7, and the supply water C is sprayed onto the solid drug layer through the spray nozzle 6. As a result, the sprayed supply water C dissolves the medicine, and medicine-dissolved water D is obtained, which is supplied to the treated water B through the pipe 4, and the treated water is sterilized. Supply water C needs to be pressurized water with the necessary pressure for spraying, and if treated water B has sufficient pressure for spraying, it is necessary to connect the main pipe 2 of treated water B to the pipe 3' of supply water C. Branched, treated water B
It is preferable to use a part of the water as feed water C.
Alternatively, pressurized water from another system may be used as the supply water C.

In the present invention, the amount of drug dissolved is proportional to the spray amount of feed water C (see FIGS. 2 and 3).
Therefore, by inserting a flow meter 9 into the pipe 3 of the feed water C and adjusting the amount of spray, it is possible to obtain a constant amount of drug dissolved in accordance with the amount of chlorine required in the treated water. By changing the spray amount of feed water C using an automatic adjustment device in response to fluctuations in the flow rate of treated water B, it is possible to always obtain an optimal amount of drug dissolution.

In the present invention, since the solid drug A is not immersed in drug-dissolving water, its swelling is inhibited, and the disintegration and outflow of the drug due to swelling is prevented.Also, even if the solid drug A bridges, it is not immersed in the water dissolving the drug. Since dissolved water is sprayed, the bridging will disappear naturally. The solid drug dissolving device of the present invention can be used not only for dissolving chlorinating agent tablets, but also in any case where quantitative dissolution of solid drugs is required.

The present invention solves various problems caused by swelling of solid drugs when dissolving them in water, and
It provides a solid drug dissolving device that can obtain a quantitative amount of drug dissolved, and its industrial significance is extremely large.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 In Fig. 1, a drug dissolving tank 1 with an inner diameter of 170 mm and a height of 500 mm has 52 small holes of 10 mmφ approximately in the middle of the main body.
A perforated plate with individual holes is provided as a perforated plate 5, and the solid drug A
15 kg of calcium hypochlorite composition tablets (Nisso Hyclone Tablets-100 manufactured by Nippon Soda) measuring 50 mmφ×30 mmH were irregularly packed onto the perforated plate 5. Eye plate 5
3/4 inch spray nozzle 6 installed in the upper center
From there, feed water C with a pressure of 0.8 kg/cm ² G is passed through pipe 3' branched from main pipe 2 of treated water B to 1200 kg/cm 2 G.
The solid drug was dissolved by spraying at a feed rate of Hr. The dissolution rate of solid drug A is 2000g/Hr
and remained constant during the experimental period. Further, no bridging phenomenon of solid drug A was observed during the experimental period.

Example 2 In Example 1, the dissolution rate of solid drug A was measured by varying the spray amount of feed water C. The results are shown in FIG. 2 together with Example 1. During this experiment, no bridging phenomenon was observed for solid drug A.
A constant feed water C spray amount resulted in a constant solid drug A dissolution rate. As shown in Figure 2,
A comparative relationship is established between the spray amount of feed water C and the dissolution rate of solid drug A.

Example 3 Using the same device as used in Examples 1 and 2, a 30 mmφ x 12 mmH plate was placed on the perforated plate 5 of the drug dissolving tank 1.
15 kg of trichloroisocyanuric acid composition tablets (Nisso Mersan-W, manufactured by Nippon Soda) were filled irregularly, and the spray amount of feed water C was varied in the same manner as in Example 2 to dissolve the solid drug A. The speed was measured. The dissolution rate of solid drug A was constant at each spray amount of feed water C, and was also proportional to the spray amount of feed water C. The results are shown in Figure 3.

Example 4 In Fig. 1, a 3.5-mesh wire mesh was attached as a perforated plate 5 approximately in the middle of the main body of the drug dissolving tank 1 having an inner diameter of 170 mm and a height of 500 mm, and a wire mesh of 3.5 mesh was attached on the perforated plate.
50mmφ×30mmH calcium hypochlorite composition tablet (Nisso Hyclone Tablet-100 manufactured by Nippon Soda) 15
Kg was filled irregularly. From the 3/4 inch spray nozzle 6 provided at the center of the upper part of the perforated plate 5: Supply water C at a pressure of 0.8 Kg/cm ² G through the supply water C piping 3.
The solid drug A was dissolved by spraying at various feeding speeds. The amount of solid drug dissolved was constant at each spray amount of feed water C, and the amount was proportional to the spray amount of feed water C. Further, during the experiment, no disintegration and outflow of solid drug A and bridging phenomenon were observed.

Example 5 Using the same apparatus as in Example 5, solid drug A was
The treatment was carried out in the same manner as in Example 4, except that the tablets were made into trichloroisocyanuric acid composition tablets (Nisso Mersan-W, manufactured by Nippon Soda) of mmφ×12 mmH, and the amount of solid drug dissolved was measured. The results are shown in Figure 3.
The amount of solid drug dissolved was proportional to the amount of feed water C sprayed. Further, during the experiment, no disintegration and outflow of solid drug A, and no bridging phenomenon was observed.

Comparative Example 1 A tank with an inner diameter of 170 mm, which has a perforated plate at the bottom of the drug dissolution tank, supplies the entire amount of treated water as feed water from the bottom, and discharges dissolved water from the middle of the drug-filled layer.
As a solid chlorine agent, it is installed in a chemical dissolution tank with a height of 500 mm and a dissolution water piping height of 150 mm from the perforated plate.
50mmφ×30mmH calcium hypochlorite composition tablet (Nisso Hyclone Tablet-100 manufactured by Nippon Soda) 15
Kg was randomly packed onto the perforated plate. Water was supplied from the supply water piping at a supply rate of 1200/H to dissolve the solid drug. Dissolution rate of solid drug is 2400g/H
It was hot. Furthermore, a bridging phenomenon of solid drug A was observed during the experimental period. Furthermore, after one week of use, scale adhesion was observed inside the dissolution water pipe.

Comparative Example 2 In Comparative Example 1, the dissolution rate of solid drug A was measured while varying the amount of water supplied. The results are shown in FIG. 2 together with Example 1. As shown in FIG. 2, the change in the dissolution rate of solid drug A due to the change in the amount of water supplied was extremely small compared to Examples 2 and 4.

Comparative Example 3 Using the same equipment as used in Comparative Examples 1 and 2, 15 kg of trichlorisocyanuric acid composition tablets (Nippon Soda Mersan W manufactured by Nippon Soda) with a diameter of 30 mm and 12 mm H were filled irregularly onto the perforated plate 1, and the following was carried out. As in Comparative Example 2, the dissolution rate of solid drug A was measured while varying the amount of water supplied. The results are shown in FIG.

[Brief explanation of drawings]

Fig. 1 Diagram of one embodiment of the present invention Symbols used: 1: Drug dissolution tank, 2: Main piping for treated water, 3, 3': Piping for supply water, 4: Piping for drug dissolution water, 5: Perforated plate, 6: spray nozzle, 7: solid drug inlet, 8: gas outlet, 9: flow meter, A: solid drug, B: treated water, C: supply water, D: drug-dissolved water. Figure 2 Dissolution amount curve of inorganic chlorinating agent, vertical axis:
Solid drug dissolution amount (g/Hr), horizontal axis: feed water spray amount (/Hr), ○: according to Examples 1 and 2, ◎: according to Example 4, ×: according to Comparative Example 1 and Comparative Example 2, Figure 3 Dissolution amount curve of organic chlorinating agent, vertical axis: solid drug dissolution amount (g/Hr), horizontal
Axis: Supply water spray amount (/Hr), ○: Example 3
◎: According to Example 5, ×: According to Comparative Example 3.

Claims (1)

[Scope of Claims] 1 A drug dissolving tank 1 filled with solid drug A, a main pipe 2 for treated water B, a pipe 3 for supply water C to the drug dissolving tank 1, and a connection between the drug dissolving tank 1 and the main pipe 2. It consists of a connecting pipe 4 for drug dissolving water D, and a drug dissolving tank 1.
includes a perforated plate 5 that holds the filled layer of solid drug A above the liquid level of drug-dissolved water D, a spray nozzle 6 that sprays supply water upward onto the upper part of the perforated plate 5, and an inlet 7 for solid drug A. , a gas outlet 8 , and a connecting nozzle for a supply water pipe 3 and a drug-dissolving water pipe 4 . 2. The apparatus according to claim 1, wherein the supply water C pipe 3' is branched from the treated water B main pipe 2. 3. The device according to claim 1, wherein the perforated plate 5 is one type selected from the group consisting of a perforated plate, a slit plate, an expanded metal, and a wire mesh. 4. The apparatus according to claim 1, wherein the spray nozzle 6 is a fully removable spray nozzle.