JPH0512998B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention continuously detects residual chlorine in seawater, and in particular converts the detected residual chlorine concentration into an electrical signal and feeds it back to a chlorine injection device. The present invention relates to an automatic residual chlorine detection device suitable for automatically controlling the amount of chlorine injection.

[Conventional technology]

Conventional examples of automatic residual chlorine detection are shown in FIGS. 3 and 4. Sampling seawater taken from a seawater line 1 is passed through a strainer 2 to remove mud or foreign matter, and is sent to a detector 4 via a pump 3 to detect residual chlorine. The detected residual chlorine is transmitted to the analyzer 6 and the control panel 7 by electric signals according to its concentration, and the amount of chlorine injected by the chlorine injection device 8 is controlled. As the strainer 2, a net or a micron filter is used. Pump 3 may not be necessary if there is sufficient water pressure on the sampling water intake side.

In addition, related technologies of this type include:
For example, there are Japanese Patent Application Laid-open Nos. 179191/1982 and 166082/1982.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, mud or foreign matter is removed using a screen or filter installed in the strainer 2, but it becomes clogged in a short period of time, and the sampling seawater cannot flow to the detector 4 side, so the screen is frequently used. Or maybe the filter needed to be replaced. In addition, if a coarse mesh or filter is used to prevent clogging, mud or foreign matter that passes through the strainer 2 will adhere to the diaphragm 5 of the detector 4 shown in Figure 4, making it impossible to detect residual chlorine. Therefore, there was a problem that the diaphragm 5 had to be replaced in a short period of time.

An object of the present invention is to automatically detect residual chlorine continuously without the need for high maintenance as described above.

[Means to solve the problem]

The above object is achieved by changing the configuration of the continuous automatic detection system and the shape of the detection part.

The former uses a centrifugal separator to remove mud or foreign matter, while the latter uses a shape that creates a turbulent flow of sampling seawater at the detection part to prevent mud or foreign matter from adhering to the detector diaphragm. This is achieved by adopting In addition, dirt or foreign matter that has adhered to the detector diaphragm due to long-term continuous operation is removed by washing in the cleaning backwash line, allowing continuous automatic detection of residual chlorine to continue without replacing the diaphragm, achieving the objective. be done.

[Effect]

The mud or foreign matter flowing into the centrifugal separator rotates inside the separator along the circumferential side wall and falls to the bottom of the separator. The fallen items are discharged out of the system through the blow piping.
This removes most of the mud or foreign matter from the sampled seawater, so that only a small amount of it adheres to the detector diaphragm. Since this separator uses centrifugal force to remove mud or foreign matter, it does not require screens or filters that need to be replaced frequently due to clogging.

Even if the above separator is installed, some mud or foreign matter will still flow towards the detector, so a dam will be installed to turbulently flow the sampling seawater at the detection part.
This turbulent flow constantly washes away mud or foreign matter adhering to the detector diaphragm, so residual chlorine can be detected continuously.

However, mud or foreign matter that has adhered due to long-term operation cannot be removed only by turbulence in the normal flow direction, so turbulence in the reverse flow direction is applied to remove it.

Moreover, by using fresh water that does not contain any dirt or foreign matter, deposits are completely removed.
Does not require septum replacement.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, sampling seawater taken from a seawater line 1 is pressurized by a pump 3, and mud or foreign matter is removed by a centrifugal separator 9. The removed material is blown out of the system through a blow line 10. A residual chlorine detector 4 detects residual chlorine in the sampled seawater from which mud or foreign matter has been removed. A dam 1 makes the sampling seawater turbulent to prevent mud or foreign matter from adhering to the detector diaphragm 5.
2 will be provided.

Mud or foreign matter that has adhered to the diaphragm 5 due to long-term use is removed by backwash water from the backwash water line 11. Backwash water is blow line 1
Drain water out of the system from 0.

According to this embodiment, there is no need to replace the diaphragm 5, and residual chlorine can be continuously and automatically detected except during backwashing due to long-term use.

〔Effect of the invention〕

According to the present invention, there is no need for a strainer to remove dirt or foreign matter, so there is no need to replace the mesh or filter, and there is no need to replace the detector diaphragm, so it is highly economical. In addition, since the functional defect in which detection of residual chlorine is interrupted due to these replacements can be resolved, residual chlorine is detected and feedback is sent back to the analyzer and control panel by electrical signals, allowing automatic control of the chlorine injection device.

[Brief explanation of drawings]

Fig. 1 is a system diagram of a continuous automatic residual chlorine detection system according to an embodiment of the present invention, Fig. 2 is a detailed sectional view of the residual chlorine detection of Fig. 1, Fig. 3 is a system diagram of a conventional residual chlorine detection system, and Fig. 4 is a system diagram of a conventional residual chlorine detection system. The figure is a detailed sectional view of residual chlorine detection in FIG. 3. 1... Seawater line, 2... Strainer, 3... Pump, 4... Detector, 5... Diaphragm, 6... Analyzer, 7... Control panel, 8... Chlorine injection device, 9... Centrifugal separator, 10... Blow line, 11...Washing water line for backwashing, 12...Dam for turbulent flow.

Claims (1)

[Claims] 1. A means for injecting chlorine into the seawater line, a sampling pump for taking out a portion of the seawater downstream of the seawater line, a centrifugal separator for separating and removing solids contained in the seawater from the sampling pump, and the centrifuge. a first pipe that guides seawater from the separator; one end is connected to the first pipe;
a residual chlorine concentration detector whose other end is connected to a second pipe leading to the seawater line and which detects the chlorine concentration contained in seawater; and a residual chlorine concentration detector which is connected to the second pipe and which is capable of supplying fresh water to the residual chlorine concentration detector 3 piping,
A control means for controlling the amount of chlorine injected by the chlorine injection means according to the measurement result of the residual chlorine concentration detector, and a flow direction of the fluid in the residual chlorine concentration detector from the first piping to the second piping side. and a valve means for switching the flow from the third pipe to the first pipe side, and the residual chlorine concentration detector is provided with a protrusion for making the fluid flowing there turbulent. Continuous automatic detection device for residual chlorine concentration.