JPH0518374B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for accurately detecting the ability of an ion exchange resin in a water treatment device. [Prior Art] Conventionally, as methods for detecting deterioration of ion exchange resins in water treatment equipment, methods using a timer, flow rate measurement methods, electrical resistance measurement methods of resin water systems, etc. have been used. The method of using a timer is to set a time in advance during which the capacity of the ion exchange resin is expected to decrease depending on the usage status of the water treatment equipment, and to notify the user when the time has elapsed. However, since this method of using a timer sets a certain period of time, if the ion exchange resin is regenerated based on this method, there may be a problem in which the ion exchange resin is regenerated even though it has sufficient ion exchange capacity. There was an economical point, and conversely, there was a disadvantage that regeneration could not begin even if the ion exchange capacity had already been exhausted. In addition, the flow rate measurement method is an indirect method that detects the reduced capacity of the ion exchange resin based on the relationship between the preset concentration of ions to be removed in raw water and the flow rate through the water treatment equipment. It may not be possible to accurately detect abilities. For example, if the concentration of ions to be removed in raw water changes, similar to the method of using a timer, the ion exchange resin may not regenerate even if its capacity is exhausted, causing leakage of ions to be removed, or The problem is that it regenerates even though it has sufficient ability. On the other hand, as shown in Fig. 3, the resin water-based electrical resistance measurement method uses measuring electrodes A'-B' and reference electrodes C'-
D' is provided, and the resin water resistance value between A' and B' is compared with the reference resistance value between C' and D' to detect resin deterioration (the deterioration range of ion exchange resin is
When it reaches the area between A' and B', the ions removed from the raw water are replaced with the ions already attached to the resin, thereby increasing the resin water resistance value). In this method, A'-
Among the resistance components of the resistance value between B′, the surface resistance value of A′ and B′ portions has a large proportion, so the deterioration range is
The comparison voltage value increases rapidly only when passing B', and the amount of increase becomes small when the deterioration range passes between A' and B' (see curve Q in Figure 4). In other words, in this method, the length of the resin cylinder filled with ion exchange resin becomes long, and if measurement electrodes A' and B' are placed at a distance, it is difficult to accurately measure the remaining capacity of the ion exchange resin. It was hot. [Problems to be Solved by the Invention] This invention eliminates the above-mentioned drawbacks, and by continuously detecting the deterioration state of the ion exchange resin and accurately knowing the remaining capacity of the ion exchange resin, it is possible to improve the appropriateness of the ion exchange resin. The purpose of the present invention is to provide an ion exchange resin performance measuring device that enables accurate replacement/regeneration timing detection or accurate calculation of the required amount of regenerant used. [Means for Solving the Problems] That is, the present invention connects a resin cylinder filled with ion exchange resin to a control valve connected to an inlet pipe and an outlet pipe, and connects a resin cylinder filled with ion exchange resin to a control valve that connects an inlet pipe and an outlet pipe. In the past, in a water treatment device that circulated raw water, a pair of measurement start electrodes A ₁ -A ₂ and a pair of measurement reference electrodes D ₁ -D ₂ were installed at the top measurement position and the bottom measurement position of the ion exchange resin layer. a pair of measurement intermediate electrodes each installed at at least one or more points substantially equally divided between the electrodes;
B ₁ −B ₂ , C ₁ −C ₂ , ... are arranged, and the measurement starting electrode is determined based on the resistance value between each of the measurement electrodes.
The output values a , b , c ,... of A1 _{- A2} and the measurement intermediate electrodes _B1 - _B2 , _C1 - _C2 ,... are averaged, and the average value is used as the output of the measurement reference electrode _D1 - _D2. It is characterized by being equipped with a control box that calculates the residual capacity of the ion exchange resin by dividing by the value d . [Example] The present invention will be described below with reference to the drawings. 1st
The figure is an explanatory diagram of an embodiment of the present invention.
1 in the figure is a water treatment device, which uses an ion exchange resin filled in a resin cylinder 2 to remove hard components from raw water (hard water) and make the water soft. A ₁ −A ₂ , B ₁ −B ₂ , C ₁ − in the figure
C ₂ , D ₁ -D ₂ represent pairs of four electrodes provided at predetermined intervals in the resin water system within the resin cylinder 2. 3 is a control box that periodically applies voltage between electrodes A ₁ -A ₂ , B ₁ -B ₂ , ..., D ₁ -D ₂ and detects and calculates the resistance between each of these electrodes. , and is configured to output a signal representing the remaining capacity. Reference numeral 4 denotes a control valve equipped with a display section 4' on its upper part. Next, the effect will be explained. Raw water (hard water) enters the water treatment device 1 through the inlet pipe 5. In this water treatment device, raw water is made into soft water by removing hard components using an ion exchange resin. The raw water passes through the electrodes A ₁ -A ₂ to _{D 1} -D ₂ and is transferred to the outside of the system from the outlet pipe 6. Then, the deterioration range L of the ion exchange resin in the resin cylinder 2 progresses toward the downstream region with the passage of water. When a voltage is applied between each pair of electrodes A ₁ -A ₂ , B ₁ -B ₂ , C ₁ -C ₂ ,... by the operation of the control box 3, the resistance between each electrode is detected as an electrical signal. After being calculated in the control box, an electrical signal representing the remaining capacity is obtained. This state is shown in a to f in FIG. That is, FIG. 2a shows a state in which the deterioration range L reaches between A ₁ and A ₂ and the output voltage rises. They appear as shown in b to d. In these cases, by dividing by the value of the reference electrode signal d , it is converted into a signal that is less susceptible to the effects of temperature and raw water concentration. That is, Fig. 2 e is a graph of the average of output values a to c divided by the output value d of the reference electrode, and Fig. 2 f is a graph of the calculated value e from a constant voltage value in order to display the remaining capacity. It is a graph of the voltage value after subtracting the value. This method not only makes it possible to display the residual capacity of the ion exchange resin during water flow, but also
Even during regeneration, the occurrence of troubles such as poor suction of salt water or insufficient salt water concentration can be detected by the detected value of the comparison voltage. Furthermore, this method can be used not only for the softening apparatus described in the embodiment, but also for all water treatment apparatuses using ion exchange resins. Note that the curve Q in FIG. 4 shows the change in output voltage according to the conventional resin water-based electrical resistance measuring method in comparison with the present invention. In this conventional method, since the measuring electrodes are provided remotely, the output voltage increases rapidly only when the ion exchange resin in the electrode area deteriorates, and otherwise there is little change in the output voltage value. [Effects of the Invention] As described above, the present invention detects the resistance value between each electrode throughout the resin cylinder of the water treatment equipment, and uses a method to determine the resistance value by proportionally distributing it. It is possible to continuously detect the range of deterioration (in the height direction). Therefore, according to the present invention, it is possible to accurately know the remaining capacity of the ion exchange resin, and it is possible to determine an economical time to regenerate the ion exchange resin or the amount of regenerant to be used.
Furthermore, the remaining capacity can be displayed at all times. In addition, since the resistance value between the electrodes is detected, even if regeneration is started, salt water may not be sucked in due to clogged valves, etc., or raw salt may be blocked due to salt bridges, etc.
It is possible to detect troubles such as insufficient concentration, and it is possible to provide a water treatment device that reliably performs regeneration.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment of this invention,
Figure 2 a to d are graphs showing the changes in the output voltage of each electrode in this invention, Figure 2 e is a graph showing the overall output voltage of a to c, and Figure 2 f is graph 2 e. FIG. 3 is an explanatory diagram showing a conventional example, and FIG. 4 is a graph showing changes in comparison voltage in the conventional case. DESCRIPTION OF SYMBOLS 1... Water treatment device, 2... Resin tube, 3... Control box, 4... Control valve, 5... Inlet piping, 6... Outlet piping, A ₁ , A ₂ , B ₁ , B ₂ , C ₁ ,
C ₂ , D ₁ , D ₂ ...electrodes.

Claims (1)

[Claims] 1 In a water treatment device 1 in which a resin cylinder 2 filled with ion exchange resin is connected to a control valve 4 connected to an inlet pipe 5 and an outlet pipe 6, and raw water is caused to flow from the top to the bottom of the ion exchange resin layer. , one pair of measurement starting electrodes A ₁ at the top measurement position and the bottom measurement position of the ion exchange resin layer.
-A ₂ and measurement reference electrode D ₁ -D ₂ are respectively installed,
A pair of measurement intermediate electrodes B ₁ -B ₂ each at at least one or more points substantially equally divided therebetween,
C ₁ -C ₂ ,... are arranged, and based on the resistance value between the respective measurement electrodes, the measurement start electrode A ₁ -A ₂ and the measurement intermediate electrode B ₁ -B ₂ , C ₁ -C ₂ ,... The output value a ,
b, c , ..., and the average value is used as the measurement reference electrode.
A capacity measuring device for a water treatment device, comprising a control box 3 that calculates the remaining capacity of an ion exchange resin by dividing by the output value d of _D1 - _D2 .