JP6788843B2 - Dissolving device for solid chlorine-based chemicals - Google Patents

Description

The present invention relates to a solid chlorine-based drug dissolving device for producing a disinfectant solution by dissolving a solid chlorine-based drug in water in a mixing tank.

Such a solid chlorine-based chemical dissolving device is provided in, for example, a ballast water treatment device of a ship. A typical example of ballast water treatment for sterilizing ship's ballast water with a sterilizer is to filter the seawater taken from outside the ship, inject a sterilizer containing an oxidizing substance into the filtered seawater, and then inject the sterilizer. The seawater is sterilized by storing or filling the ballast tank, and the seawater taken from the ballast tank is injected with a reducing agent containing a reducing substance, and the seawater after the reducing agent is injected is drained to the outside of the ship. It can be roughly divided into reduction treatment. As a sterilizing treatment, it is known to use an aqueous solution of a chlorine-based chemical containing free active chlorine having an oxidizing property as a sterilizing agent. An aqueous solution of the chlorine-based chemical (disinfectant solution) can be prepared by dissolving the solid chlorine-based chemical in water (Patent Document 1).

The solid chlorine-based drug dissolving device of Patent Document 1 takes in a tank for storing the solid-chlorine-based drug, a feeder provided at the bottom of the tank for cutting out a certain amount of the solid-chlorine-based drug, and a liquid such as seawater from the outside. It has a liquid supply line and a feeder and a mixing tank connected to the liquid supply line. The solid chlorine-based chemicals from the feeder and the liquid from the liquid supply line are supplied to the mixing tank, and the solid chlorine-based chemicals are dissolved in the liquid in the mixing tank to generate a disinfectant solution.

In the melting device having such a configuration, the inner surface of the passage for supplying the solid chlorine-based chemicals from the tank to the mixing tank, that is, the feeder, the payout pipe connecting the feeder and the mixing tank, and the payout pipe are provided. The inner surface of the on-off valve or the like may be moistened by the moisture evaporated from the mixed liquid in the mixing tank. Wetting of the inner surface of the passage causes a problem that the solid chlorine-based chemicals from the tank adhere to the inner surface of the passage and block the passage. As a measure against this problem, purge air (for example, dry air) is supplied to the wetness of the inner surface of the passage, the inside of the mixing tank, specifically, the space formed above the mixed solution in the mixing tank, and the purge air is supplied. It is known that the above-mentioned water is accompanied and discharged to the outside from an air vent provided in the mixing tank. As a result, the moisture is not brought to the passage, and the inner surface of the passage is moistened and thus the passage is prevented from being blocked.

International release 2014/007171

When, for example, sodium dichloroisocyanurate is used as the solid chlorine-based chemical in the dissolving apparatus of Patent Document 1, if the temperature of the dissolved water of the solid chlorine-based chemical generated in the mixing tank is high, chlorine gas (chlorine-containing gas) Occurs. When the chlorine gas is discharged to the outside from the air vent together with the purge air, it adversely affects the external environment. In addition, the chlorine gas may cause corrosion of equipment around the dissolution device.

In view of the present invention, when a solid chlorine-based chemical is dissolved in water in a mixing tank to generate a disinfectant solution, the purge air supplied into the mixing tank is discharged from the air vent of the mixing tank. Another object of the present invention is to provide a dissolution device for a solid chlorine-based chemical that can reduce the adverse effect of chlorine gas on the outside and the corrosion of peripheral devices.

In the present invention, the meanings or interpretations of the following terms shall be as follows, unless otherwise specified.

The "chlorine-based chemical" produces a chemical that releases free active chlorine having a bactericidal action or a substance that can release the free active chlorine by disproportionation in an aqueous solution when dissolved in water as a solvent. It is a drug and is "solid" in the present invention. "Solid" means that it is in the form of powder, granules or tablets at room temperature. In the present invention, an aqueous solution obtained by dissolving a solid chlorine-based chemical in water is used as a disinfectant.

Typical examples of the "solid chlorine-based drug" are trichloroisocyanuric acid, sodium dichloroisocyanurate and its hydrate, potassium dichloroisocyanuric acid and the like. The "chlorine-based bactericidal agent" is a chemical that sterilizes by utilizing the bactericidal action of free effective chlorine, and a typical example thereof is an aqueous solution of a chlorine-based chemical.

The solid chlorine-based drug dissolving apparatus according to the present invention dissolves the solid chlorine-based drug in water in a mixing tank to generate a disinfectant solution.

The hopper that houses the solid chlorine-based chemicals, the feeder that receives the solid chlorine-based chemicals from the hopper and cuts out the solid chlorine-based chemicals, and the solid chlorine-based chemicals cut out from the feeder and the fresh water from the fresh water supply line are supplied. It has a mixing tank that mixes solid chlorine-based chemicals and fresh water to generate a mixed solution, a purge air supply mechanism that supplies purge air to the mixing tank, and an air vent that discharges the purge air from the mixing tank. It is characterized by having an activated carbon adsorbent that adsorbs and removes chlorine gas generated in the mixing tank and contained in the purge air from the purge air.

In the present invention, the purge air supplied to the mixing tank contains chlorine gas generated in the mixing tank, and when the purge air passes through the air vent, it is contained in the purge air by the activated carbon adsorbent provided in the air vent. The chlorine gas is adsorbed and removed. Therefore, the purge air discharged from the air vent does not contain chlorine gas, and as a result, the chlorine gas is prevented from being discharged to the outside of the mixing tank.

In the present invention, the air vent may further have a filter for capturing fine powder of solid chlorine-based chemicals contained in purge air. In the space formed in the mixing tank, that is, the space above the mixed solution, the fine powder of the solid chlorine-based chemical may be scattered without being mixed with water. In such a case, the purge air contains chlorine gas and the fine powder. Then, when the purge air passes through the air vent, chlorine gas is adsorbed and removed by the activated carbon adsorbent as described above, and the fine powder is captured by the filter. Therefore, even if the inner surface of the air vent is moistened by the moisture contained in the purge air, the fine powder does not adhere to the inner surface of the air vent. As a result, it is possible to prevent the air vent from being blocked by the fine powder, and to ensure a good ventilation state of the purge air.

According to the present invention, by providing an activated carbon adsorbent for adsorbing chlorine gas in the air vent, when the purge air passes through the air vent, the chlorine gas contained in the purge air is adsorbed by the activated carbon adsorbent. Therefore, chlorine gas is not discharged from the air vent, and as a result, it is possible to suppress an adverse effect of chlorine gas on the outside of the dissolving device and corrosion of peripheral equipment.

It is a block diagram of the dissolution apparatus of the solid chlorine-based agent which concerns on one Embodiment of this invention. FIG. 1 is a configuration diagram of an air vent provided in the device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Needless to say, the present invention is not limited to the illustrated embodiments.

The solid chlorine-based chemical dissolving device 1 (hereinafter referred to as “bactericide dissolving device 1”) according to the present embodiment is provided in a ballast water treatment device (not shown) mounted on a ship (not shown). There is. The disinfectant dissolving device 1 dissolves a solid chlorine-based chemical in fresh water to generate a disinfectant aqueous solution as a chlorine-based disinfectant, and supplies the disinfectant aqueous solution to seawater as ballast water taken into a ship. .. That is, in the present embodiment, the disinfectant dissolving device 1 also functions as a disinfectant supplying device for supplying the disinfectant aqueous solution to ballast water.

FIG. 1 is a block diagram of the disinfectant dissolving device 1 according to the present embodiment. In the present embodiment, as seen in FIG. 1, the disinfectant dissolving device 1 is generated by a mixed liquid generating unit 1A that mixes a solid chlorine-based chemical and fresh water to generate a mixed liquid, and the mixed liquid generating unit 1A. It is roughly classified into a disinfectant solution generating unit 1B that circulates the mixed solution to generate a disinfectant solution.

The mixed liquid generation unit 1A includes a hopper 2 for accommodating solid chlorine-based chemicals, a feeder 3 for cutting out and supplying solid chlorine-based chemicals from the hopper 2, a fresh water tank 4 for storing fresh water, and solid chlorine from the feeder 3. A mixing tank 5 that receives fresh water from the system chemicals and the fresh water tank 4 and mixes the solid chlorine-based chemicals with the fresh water to generate a mixed solution, a payout pipe 6 that connects the feeder 3 and the mixing tank 5, and the discharge. The first valve 7 as an on-off valve provided in the pipe 6, the fresh water supply line 8 connecting the fresh water tank 4 and the mixing tank 5, the fresh water pump 9 provided in the fresh water supply line, and the fresh water pump 9 It has a second valve 10 as an on-off valve provided in the fresh water supply line 8 at a position on the downstream side.

Further, the mixing liquid generation unit 1A is connected to the mixing tank 5 and discharges the purge air to the outside of the mixing tank 5 and the purge air supply device 11 as a purge air supply mechanism for supplying the purge air to the mixing tank 5. It also has an air vent 12.

The feeder 3 is provided at the lower end of the hopper 2, receives a solid chlorine-based chemical from the hopper, and cuts out a certain amount thereof. The feeder 3 is composed of, for example, a rotary valve, a screw feeder, or the like. The solid chlorine-based chemicals cut out in the feeder 3 pass through the discharge pipe 6 and are supplied to the mixing tank 5. The supply and stop of the solid chlorine-based chemicals are switched by opening and closing the first valve 7. The fresh water from the fresh water tank 4 is sent out by the drive of the fresh water pump 9, circulates through the fresh water supply line 8, and is supplied to the mixing tank 5. The supply of fresh water and its stop are switched by opening and closing the second valve 10.

The mixing tank 5 receives the solid chlorine-based chemicals cut out by the feeder 3 and the fresh water from the fresh water tank 4, and mixes the solid chlorine-based chemicals and the fresh water to generate a mixed liquid. At this time, a liquid phase composed of the mixed liquid and a space located above the liquid phase are formed in the mixing tank 5. In the space, water and chlorine gas generated from the mixed solution, and fine powder of solid chlorine-based chemicals scattered without being mixed with fresh water are present. In the present embodiment, the purge air supply device 11 is connected to the upper part of the mixing tank 5 at a height position communicating with the space, and supplies purge air to the space. As the purge air ventilates the space, the moisture, the chlorine gas, and the fine powder are accompanied by the purge air. Further, the air vent 12 is provided in the upper part of the mixing tank 5 so as to communicate with the space of the mixing tank 5, and the purge air ventilated in the space is discharged to the outside of the mixing tank 5.

FIG. 2 is a configuration diagram of an air vent 12 provided in the disinfectant dissolving device 1 of FIG. In FIG. 2, the flow of purge air is indicated by an arrow. The air vent 12 is provided in the upper part of the mixing tank 5 as described above, and has a casing 20, a filter 23 housed in the casing 20, and an activated carbon adsorbent cartridge 24, as shown in FIG. doing.

The casing 20 has a tubular body portion 21 extending in the vertical direction and a lid portion 22 attached to the upper portion of the body portion 21. The lid portion 22 is formed with a plurality of exhaust ports 22A for discharging purge air to the outside on the upper surface thereof. The filter 23 has a tubular shape extending in the vertical direction, and is detachably housed in the body 21 of the casing 20. The upper end of the filter 23 is closed and the lower end is open, and the filter 23 receives purge air from the lower end. Further, on the side portion of the filter 23, a capturing portion 23A for ventilating the purge air and capturing the fine powder of the solid chlorine-based chemical contained in the purge air is provided in the entire circumferential direction of the filter 23.

The activated carbon adsorbent cartridge 24 is detachably housed in the lid 22 of the casing 20 at a position above the filter 23. The activated carbon adsorbent cartridge 24 is adapted to ventilate the purge air that has passed through the trapping portion 23A of the filter 23 and to adsorb chlorine gas contained in the purge air. Further, the purge air that has passed through the activated carbon adsorbent cartridge 24 is discharged to the outside from the exhaust port 22A of the lid portion 22.

As shown in FIG. 1, the sterilizing agent solution generating unit 1B of the sterilizing agent dissolving device 1 receives and delivers the mixed liquid from the mixing tank 5 and the mixed liquid sent by the circulation pump 13. A cyclone 14 that separates the mixed solution into a disinfectant undissolved solution and a disinfectant solution that is a chlorine-based disinfectant, and a circulation line 15 that returns the disinfectant undissolved solution from the cyclone 14 to the circulation pump 13. A third valve 16 as an on-off valve provided in the circulation line 15 between the circulation pump 13 and the cyclone 14, a disinfectant supply line 17 for supplying the disinfectant solution from the cyclone 14 to the ballast water, and the like. As an on-off valve provided in the disinfectant supply line 17 between the cyclone 14 and the disinfectant pump 18 and the disinfectant pump 18 provided in the disinfectant supply line 17 to send the disinfectant solution toward the ballast water pipe. It has a fourth valve 19 of the above.

The cyclone 14 discharges the disinfectant solution from the disinfectant solution discharge port 14A and discharges the disinfectant undissolved solution from the disinfectant undissolved solution discharge port 14B. The disinfectant solution discharged from the disinfectant solution discharge port 14A passes through the disinfectant supply line 17 and is supplied to ballast water. On the other hand, the disinfectant undissolved liquid discharged from the disinfectant undissolved liquid discharge port 14B rejoins the mixed liquid through the circulation line 15, returns to the circulation pump 13, and is then sent out to the cyclone 14. .. The flow and stop of the mixed solution and the disinfectant undissolved solution in the circulation line 15 are switched by opening and closing the third valve 16, and the flow and stop of the disinfectant solution in the disinfectant supply line 17 is the fourth valve 19 It can be switched by opening and closing.

Next, the operation of the disinfectant dissolving device 1 will be described. In the disinfectant dissolving device 1, first, the fresh water of the fresh water tank 4 is supplied to the mixing tank 5 by the fresh water supply line 8 by driving the fresh water pump 9, and the solid chlorine-based chemicals in the hopper 2 are cut out by the feeder 3 in a predetermined amount. It is supplied to the mixing tank 5 via the discharge pipe 6. As a result, in the mixing tank 5, a mixed solution is generated by mixing fresh water and a solid chlorine-based chemical.

As described above, a space is formed above the mixed liquid in the mixing tank 5, and water and chlorine gas generated from the mixed liquid and fresh water are scattered in the space without being mixed. Fine powder of solid chlorine-based chemicals is present. The water, chlorine gas, and fine powder of the solid chlorine-based chemicals are accompanied by the purge air supplied from the purge air supply device 11 to the space and discharged. Then, when the purge air ventilates the capture portion 23A of the filter 23 of the air vent 12, the fine powder of the solid chlorine-based chemical contained in the purge air is captured by the capture portion 23A. Further, when the purge air that has passed through the capture unit 23A passes through the activated carbon adsorbent cartridge 24, the chlorine gas contained in the purge air is adsorbed by the activated carbon adsorbent cartridge 24 and removed from the purge air. As a result, the purge air from which the chlorine gas and the fine powder of the solid chlorine-based chemical have been removed is discharged to the outside from the exhaust port 22A of the air vent 12. At this time, the water content is contained in the purge air and is discharged from the exhaust port 22A together with the purge air.

In the present embodiment, since the water evaporated from the mixed liquid in the mixing tank 5 is discharged from the air vent 12 to the outside of the mixing tank 5 by purge air, the inner surface of the passage of the solid chlorine-based chemicals supplied from the hopper 2 to the mixing tank 5 That is, the inner surfaces of the feeder 3, the discharge pipe 6 and the first valve 7 are not wetted by the above-mentioned moisture. Therefore, the solid chlorine-based chemicals do not adhere to the inner surface of the passage, and as a result, the passage can be prevented from being blocked by the solid chlorine-based chemicals.

Further, in the present embodiment, chlorine gas generated from the mixed liquid in the mixing tank 5 accompanies the purge air, and when the purge air is discharged from the air vent 12, the chlorine gas is adsorbed and removed by the activated carbon adsorbent cartridge 24. .. Therefore, since chlorine gas is not discharged to the outside of the mixing tank 5, it is possible to prevent an adverse effect on the external environment. Further, it is possible to prevent the equipment around the disinfectant dissolving device 1 from being corroded by the chlorine gas.

Further, in the present embodiment, when the fine powder of the solid chlorine-based chemicals scattered in the mixing tank 5 accompanies the purge air and the purge air is discharged from the air vent 12, the fine powder is collected by the filter 23. Captured at 23A. Therefore, even if the inner surface of the air vent 12 is moistened by the moisture contained in the purge air, the fine powder does not adhere to the inner surface of the air vent 12. As a result, the air vent 12 is prevented from being blocked by the fine powder, and a good ventilation state of the purge air can be ensured.

As described above, the disinfectant dissolving device 1 according to the present embodiment is provided in the ballast water treatment device (not shown) mounted on the ship. Hereinafter, the configuration and operation of the ballast water treatment apparatus will be described. The ballast water treatment apparatus sterilizes bacteria in the ballast water by supplying the disinfectant solution produced by the disinfectant dissolving apparatus 1 to the ballast water taken into the ship.

In the ballast water treatment device, the sea chest and the ballast tank are connected by a ballast water pipe so that the seawater taken from the sea chest flows through the ballast water pipe and is filled into the ballast tank as ballast water. It has become. The ballast water pipe includes a ballast pump for sending seawater to the ballast tank, a filtration device for filtering out foreign substances and plankton in the seawater, and a sterilizer supplied to the filtered seawater from a sterilizer dissolving device. A mixer for mixing the agent solution is provided. The ballast water pipe is provided with a disinfectant injection port for injecting the disinfectant solution from the disinfectant dissolution device 1 into the ballast water flowing in the ballast water pipe between the filtration device and the mixer. There is.

When the ballast pump is operated in the ballast water treatment device having such a configuration, seawater is taken from the outside of the ship as ballast water through the sea chest and flows through the ballast water pipe, and the ballast water is brought to the filtration device. Here, foreign matter and plankton in seawater are filtered out. The ballast water after filtration goes to the mixer.

Simultaneously with or after the operation of the ballast pump, the disinfectant pump 18 provided in the disinfectant supply line 17 is operated to provide ballast water flowing through the ballast water pipe from the disinfectant inlet via the disinfectant supply line 17. , The fungicide solution (chlorine-based fungicide) produced by the fungicide dissolving device 1 is supplied to kill bacteria in ballast water. The disinfectant solution is mixed with ballast water in a mixer to perform sterilization well. Thus, the sterilized ballast water is sent to the ballast tank via the ballast water pipe and filled there.

Further, the disinfectant dissolving device is not limited to the configuration having the disinfectant dissolving solution generating unit 1B for generating the disinfectant dissolving solution by circulating the mixed solution generated in the mixed solution generating unit 1A as shown in FIG. , The disinfectant solution generation unit 1B may be omitted. In that case, a disinfectant solution, which is a chlorine-based disinfectant, is generated in the mixing tank, and the mixture generation unit 1A further provides a disinfectant supply line for supplying the disinfectant solution from the mixing tank to ballast water. It has a disinfectant pump provided in the disinfectant supply line to send the disinfectant solution toward the ballast water pipe, and an on-off valve provided in the disinfectant supply line between the mixing tank and the disinfectant pump. There is.

1 Disinfectant dissolution device (solid chlorine-based chemical dissolution device)
2 Hopper 3 Feeder 5 Mixing tank 8 Fresh water supply line 11 Purge air supply device (purge air supply mechanism)
12 Air vent 13 Circulation pump 14 Cyclone 15 Circulation line 23 Filter 24 Activated carbon adsorbent cartridge (activated carbon adsorbent)

Claims (1)

In a solid chlorine-based drug dissolving device that dissolves solid chlorine-based chemicals in water in a mixing tank to generate a disinfectant solution.
A hopper that houses solid chlorine-based chemicals and
A feeder that receives solid chlorine-based chemicals from the above hopper and cuts them out,
Supplied with the fresh water from the cut-out solid chlorinated agent and fresh water supply line from the feeder, a mixing tank to produce a mixed solution by mixing the solid chlorine-based agents and Shimizu,
A purge air supply mechanism that supplies purge air to the mixing tank,
It has an air vent that discharges the purge air from the mixing tank.
The air vent has a casing, a filter and an activated carbon adsorbent cartridge housed in the casing.
The casing has a tubular body extending in the vertical direction and a lid portion attached to the upper portion of the body portion, and a plurality of exhaust ports for discharging purge air to the outside are provided on the upper surface of the lid portion. Formed,
The filter has a tubular shape extending in the vertical direction and is detachably housed in the body of the casing. The upper end of the filter is closed and the lower end is open to receive purge air from the lower end. It is possible, and a trapping portion for ventilating purge air and capturing fine powder of solid chlorine-based chemicals contained in the purge air is provided on the side portion of the filter in the circumferential direction of the filter.
The activated carbon adsorbent cartridge is detachably housed in the lid portion of the casing at a position above the filter.
Dissolution apparatus solid chlorine agent, characterized in that the suction removal from the purge air and chlorine gas was to be contained in the purge air generated in the mixing tank with the active carbon adsorbing material cartridge of the air vent.

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