JP2013210134A - Chemical feeder for cooling tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chemical feeder for a cooling tower, capable of feeding a solid chemical dissolved in water to a cooling tower only when operated, feeding a fixed amount of the chemical corresponding to a load applied to the cooling tower, and facilitating checking the amount of the remaining solid chemical.SOLUTION: A trough-shaped water catcher 5 serving as a catchment is inserted in a filler 2 in a cooling tower 1. Part of water falling through the filler 2 is collected by the water catcher 5, and is sent through an inflow pipe 6 and a flow rate adjusting valve 7 and flows through an inflow port 8a at the bottom of a container 8 into the bottom of the container 8. Water flowing into the bottom of the container 8 comes in contact with a solid chemical inside the container 8 to create a chemical solution. This chemical solution flows out of an outflow port 8b of the container 8 and travels through a chemical feeding pipe 10 into a pit 4. In this manner, the chemical is fed.

Description

  The present invention relates to a chemical injection device to a cooling tower for dissolving and supplying a solid medicine to the cooling tower.

  As a method for dissolving a solid drug such as a scale inhibitor or an anti-slime agent in water and injecting the solid drug into the cooling tower, Patent Documents 1 to 4 immerse a water-permeable bag containing the solid drug in the pit of the cooling tower. It is described.

JP 61-21780 JP-A-61-221781 JP-A-61-21782 JP 61-22785

  When the drug is poured by immersing the solid drug container bag in the pit as described above, the solid drug dissolves even when the cooling tower is stopped. In addition, since the dissolution state of the solid drug is difficult to understand, even if all of the solid drug is dissolved, the solid drug may be left as it is, and there is a risk of insufficient drug injection.

  The present invention eliminates such problems, can dissolve the solid chemical only when the cooling tower is operating, and can dispense a chemical according to the load of the cooling tower. It is an object of the present invention to provide a medicine injection device for a cooling tower which can dispense a fixed amount of medicine and can easily check the remaining amount of a solid medicine.

  The chemical injection device to the cooling tower of the present invention includes a water collecting part that is piped or inserted into the cooling tower, a container that is disposed outside the cooling tower for containing a solid medicine, and the water collecting An inflow pipe for introducing the water collected in the section into the bottom of the container, and a chemical injection pipe for supplying a drug solution produced by the contact between the water and the solid medicine at the bottom of the container to the cooling tower; Is provided.

  In the present invention, a flow rate adjusting valve may be provided in the water collecting part, the inflow pipe or the water inflow part of the container.

  Further, a flow rate adjusting valve may be provided in the drug solution outflow portion of the container or the drug injection tube.

  At least a part of the container may be transparent.

  In the medicine pouring device to the cooling tower of the present invention, when the cooling tower is operating, water falls into the water collecting section that is arranged or inserted in the cooling tower and is collected. The collected water flows into the bottom of the container through the inflow pipe. A solid medicine is accommodated in the container, and the inflowing water comes into contact with the solid medicine to form a medicine solution. This chemical solution is added to the pit of the cooling tower through the chemical injection tube to perform chemical injection.

  When the cooling tower is stopped, water does not fall in the cooling tower, so water is not collected in the water collection section, and water does not flow into the container, and therefore no chemical injection is performed. That is, in the chemical injection device to the cooling tower of the present invention, chemical injection is not performed when the cooling tower is not operating, and chemical injection is performed when the cooling tower is operating. Moreover, an electric water supply mechanism such as a pump is not necessary for the chemical injection device for the cooling tower.

  Since this container is arranged outside the cooling tower, it is easy to replenish the solid medicine, and by making at least a part of the container transparent, the remaining amount of the solid medicine can be easily seen through the inside of the container. Can be confirmed.

It is a longitudinal cross-sectional view of the cooling tower provided with the chemical injection apparatus to the cooling tower which concerns on embodiment. It is a longitudinal cross-sectional view of a container. It is a perspective view of a water collector. It is a perspective view of a water collector.

  Hereinafter, embodiments will be described with reference to FIGS. As shown in FIG. 1, a filler 2 is disposed in the cooling tower 1. Return water from a heat exchanger (not shown) is sprinkled from the sprinkler 3 to the filler 2. The water (cold water) that has fallen through the filler 2 collects in the pit 4 and is sent to the heat exchanger.

  A bowl-shaped water collector 5 (FIG. 3) as a water collecting portion is inserted into the filler 2. Part of the water that falls between the fillers 2 is collected by the water collector 5, and flows from the inlet 8 a at the bottom of the container 8 to the bottom of the container 8 through the hose-like inlet pipe 6 and the flow rate adjusting valve 7. be introduced.

  The upper part of the container 8 is a detachable cap 8c, and the cap 8c is removed and the container 8 has a slime control agent such as calcium hypochlorite, a scale inhibitor, a corrosion inhibitor, or a mixture thereof. A solid medicine such as the above is accommodated, and then the cap 8c is attached. The container 8 is made of transparent plastic.

  The water that has flowed into the bottom of the container 8 comes into contact with the solid drug in the container 8 to form a drug solution. This drug solution flows into the pit 4 from the outlet 8b of the container 8 through the drug injection tube 10, and drug injection is performed.

  The upstream end of the inflow pipe 6 is connected to the outlet 5a (FIG. 3) of the water collector 5 by a fastening band. The end of the inflow pipe 6 is fixed to the valve 7 by a tightening band 9, and the upstream end of the medicine injection pipe 10 is connected to the outlet 8 b by a tightening band 11.

  In the chemical injection device for the cooling tower 1, when the cooling tower 1 is stopped, water does not fall in the cooling tower 1, so that water is not collected by the water collector 5 and water does not flow into the container 8. Therefore, no medication is given. Since the water falls in the cooling tower 1 when the cooling tower 1 is operating, the chemical injection is always performed as described above. Moreover, when the load on the cooling tower 1 is large, the amount of water that falls into the water collector 5 increases and the amount of chemical injection also increases. In addition, the amount of chemical injection can be adjusted by adjusting the amount of water flowing into the container 8 by the flow rate adjusting valve 7.

  The chemical injection device for the cooling tower does not require an electric water supply mechanism such as a pump, and the running cost of the chemical injection is substantially only the chemical cost.

  Since the container 8 is disposed outside the cooling tower 1, it is easy to replenish the solid medicine, and since the container 8 is made of transparent plastic, the inside of the container 8 can be seen through to easily reduce the remaining amount of the solid medicine. Can be confirmed.

  Note that when the cooling tower 1 is of a type that does not have a gap for inserting the water collector 5, a funnel-shaped water collector 15 shown in FIG. 4 is used.

  This water collector 15 is provided with a flow rate adjusting valve 18 at the lower end of the tapered portion 16 via a hanging pipe 17, and the upstream end of the inflow pipe 6 is connected to the outlet 19 of the flow rate adjusting valve 18. An overflow portion 20 is provided on the upper portion of the taper portion 16. The water collector 15 is attached so as to be suspended from the filler 2 by a wire passed through a small hole 21 provided in the upper portion. The flow rate adjustment valve 18 may be omitted.

  In the case of FIG. 4, the inflow water amount can also be adjusted by the flow rate adjusting valve 18. When it is necessary to increase the amount of inflow water, two or more water collectors 5 or 15 are installed in the cooling tower 1, and the inflow pipes connected to each are connected to one confluence inflow pipe in the middle of the container 8. Water should be allowed to flow in.

  In the above description, the flow rate adjustment valve is installed on the upstream side of the container 8, but the flow rate adjustment valve is installed on the downstream side of the vessel 8 (for example, the outlet 8b or the chemical injection pipe 10), and the valve is closed. The water may be accumulated up to a predetermined water level in the container 8 by reducing the degree. In this way, it is possible to inject a drug solution having a high concentration. A flow rate adjusting valve may be provided on both the upstream side and the downstream side of the container 8.

  The container 8 may be attached to the cooling tower 1 via an attachment member, or may be separately installed in the vicinity of the cooling tower 1.

  The above-described embodiment is an example of the present invention, and the present invention may be configured other than illustrated.

DESCRIPTION OF SYMBOLS 1 Cooling tower 2 Filling material 3 Sprinkler 5,15 Water collector 7,18 Flow control valve 8 Container

Claims (4)

A water collection section that is piped or plugged into the cooling tower;
A container disposed outside the cooling tower for containing a solid drug;
An inflow pipe for introducing water collected in the water collection section into the bottom of the container;
A chemical injection device for a cooling tower, comprising: a chemical injection pipe for supplying a chemical solution produced by contacting the water and the solid chemical at the bottom of the container to the cooling tower.   2. The chemical injection device for a cooling tower according to claim 1, wherein a flow rate adjusting valve is provided in the water collecting portion, the inflow pipe or the water inflow portion of the container.   3. The chemical injection device for a cooling tower according to claim 1, wherein a flow rate adjusting valve is provided in the chemical solution outflow portion of the container or the chemical injection tube.   The chemical injection device for a cooling tower according to any one of claims 1 to 3, wherein at least a part of the container is transparent.

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