CN101249461B - Method for detecting service life of resin in ion exchange resin tower - Google Patents

Abstract

The invention discloses an ion exchange resin tower and a system and a method for detecting the service life of resin of the ion exchange resin tower. The ion exchange resin tower comprises a tank body, a supply pipeline, an output pipeline and a plurality of sampling pipes. The supply pipeline leads the liquid into the tank body so that the liquid and the ion exchange resin in the tank body carry out ion exchange, and the treated liquid is led out from the tank body through the output pipeline. The sampling tube is arranged on the side wall of the groove body to sample the liquid in the resin. The ion exchange resin tower, the detection method and the detection system can monitor the water quality and contribute to cost saving.

Description

Detection method of resin service life in ion exchange resin tower

technical field

The invention relates to a water quality detection device and a detection method for its service life, in particular to an ion exchange resin tower and a detection method and a detection system for the service life of its resin.

Background technique

The pure water system can remove impurities in water, including suspended solids, particulates, organic matter, microorganisms, electrolytes and gases, etc., thereby increasing the resistance value of pure water to the limit to ensure high purity of water quality. Generally speaking, the resistance value of pure water is above 18MΩ. The higher the resistance value, the fewer ions in the water, that is, the better the water quality.

The ion exchange resin tower is a unit that can effectively remove ions in water in the pure water system. Taking cation exchange resin as an example, it uses cationic functional groups to exchange cations such as calcium and magnesium in water, thereby reducing the concentration of calcium and magnesium ions in the water source. In the process of ion exchange, the resin will gradually absorb cations such as calcium and magnesium in water, and the ion exchange will no longer be possible when the accumulated amount reaches saturation. At this time, the resin needs to be replaced.

There are many factors that affect the service life of the resin, such as the water quality of the previous treatment, the flow rate of the resin water, etc. Therefore, if the resin is replaced according to the service life recommended by the manufacturer, it is often replaced before the resin reaches saturation, resulting in cost increase. Therefore, knowing the exact time when the resin reaches saturation will help save costs.

Regarding the method of measuring resin saturation, the prior art discloses a method of measuring resin saturation by using a probe arranged in a tank. This method uses the probe to detect the resistance value of the surrounding water. When the resistance When the value is lower than a certain set value, it means that the resin is saturated and loses the ability to exchange ions with water, so the resin needs to be replaced.

Yet, because above-mentioned probe is positioned at tank body, therefore, can only judge the saturation degree of resin by the electric resistance value of water, and can't carry out the sampling of water to further analyze other chemical property or physical property, therefore, when the pollution in water When the contamination cannot be detected by the probe, the existing methods cannot detect the deterioration of water quality caused by these pollutants.

Contents of the invention

An object of the present invention is to provide an ion exchange resin tower, which has a sampling tube, so as to facilitate sampling of the liquid while the liquid flows through the ion exchange resin.

Another object of the present invention is to provide a detection system which can detect the liquid in the sampling pipe to ensure the water quality.

Another object of the present invention is to provide a detection method, which can analyze the service life (or remaining life) of the ion exchange resin in the resin tower according to the liquid sampled by the sampling tube.

To solve the above object of the present invention, the present invention provides an ion exchange resin tower for processing a liquid, the ion exchange resin tower includes a tank body, a supply pipeline, an output pipeline and a plurality of sampling Tube. Wherein, the tank body has an ion exchange resin to absorb ions in the liquid. The supply pipe is connected to a top of the tank to introduce liquid into the tank. The output pipeline is connected with a bottom of the tank to lead the treated liquid out of the tank. As for a plurality of sampling tubes, they are arranged on the side wall of the tank body, and each sampling tube is respectively arranged on different levels, so as to sample the liquid in the ion exchange resin.

In an embodiment of the present invention, the aforementioned liquid includes water.

In an embodiment of the present invention, the above-mentioned ion exchange resin tower further includes a plurality of distribution pipes connected to the supply pipeline, located between the ion exchange resin and the supply pipeline.

In an embodiment of the present invention, the above-mentioned ion exchange resin tower further includes a plurality of water collecting pipes connected to the output pipeline, located between the ion exchange resin and the output pipeline.

In an embodiment of the present invention, the above-mentioned sampling tubes are substantially distributed on the same vertical line.

In an embodiment of the present invention, the aforementioned sampling tubes are substantially distributed on different vertical lines.

In an embodiment of the present invention, the above-mentioned level differences between the sampling tubes are substantially the same.

In an embodiment of the present invention, the above-mentioned sampling tube can be removed from the side wall of the tank.

In an embodiment of the present invention, the above-mentioned ion exchange resin tower further includes an end sampling pipe corresponding to the connection point between the output pipeline and the tank body.

To solve the above object of the present invention, the present invention also provides a detection system, which includes the above-mentioned ion exchange resin tower and a detection unit. The detection unit is used for detecting the liquid sampled by the sampling pipe in the ion exchange resin tower.

In an embodiment of the present invention, the detection unit includes probe electrodes.

In order to solve the above object of the present invention, the present invention also provides a detection method for calculating the service life (or remaining life) of the ion exchange resin in the above ion exchange resin tower, and this detection method includes two steps. First, judge whether the ion exchange resin is saturated at different levels according to the liquid taken out by each sampling tube. Then, according to the flow direction of the liquid in the tank, the liquid taken out by the remaining sampling tubes is sequentially judged whether the ion exchange resin is saturated, and the time difference of each sampling tube corresponding to the saturated ion exchange resin is calculated, so as to determine whether the ion exchange resin in the tank is saturated. The lifetime of the remaining ion exchange resin was evaluated.

In an embodiment of the present invention, the above-mentioned method for judging whether the ion exchange resin is saturated includes measuring whether the resistance value of the liquid exceeds a monitoring set value.

In the embodiment of the present invention, the above monitoring setting value is 18M-Ohm.

According to the embodiments of the present invention, the above-mentioned ion exchange resin tower has a sampling tube for liquid sampling. On the one hand, it can monitor the water quality in real time, and on the other hand, it can perform further precise analysis on the liquid. Furthermore, by using the liquids sampled at different heights, it is possible to analyze whether the resins at different heights are saturated, and further estimate the service life (or remaining life) of the resin, so as to serve as a basis for replacing the resin. Therefore, the ion exchange resin tower and its detection system of the present invention can monitor water quality and contribute to cost saving.

Description of drawings

Fig. 1 is a schematic diagram of an ion exchange resin column according to a first embodiment of the present invention.

Fig. 2 is a schematic diagram of an ion exchange resin column according to a second embodiment of the present invention.

Fig. 3 is a schematic diagram of a detection system according to a third embodiment of the present invention.

Fig. 4 is a flow chart of the detection method of the present invention.

Wherein, the reference signs are explained as follows:

100, 100': ion exchange resin tower

101: tank body

102: Supply pipeline

103: output pipeline

104, 104a, 104b, 104c, 104d, 104': sampling tubes

105, 105a, 105b, 105c, 105d: ion exchange resin

106: distribution pipe

107: water collection pipe

120: detection unit

200: detection system

V1, V2: vertical lines

S401: step

S402: step

S403: step

Detailed ways

In order to make the above-mentioned features and advantages of the present invention more comprehensible, preferred embodiments are enumerated below and described in detail with accompanying drawings.

Fig. 1 is a schematic diagram of an ion exchange resin column according to a first embodiment of the present invention. Fig. 2 is a schematic diagram of an ion exchange resin column according to a second embodiment of the present invention.

Please refer to FIG. 1 , the ion exchange resin tower 100 of this embodiment is suitable for treating liquid, and the liquid can be water as an example. The ion exchange resin tower 100 includes a tank body 101, a supply pipeline 102, an output pipeline 103 and a plurality of sampling pipes 104a, 104b, 104c, 104d. There is an ion exchange resin 105 in the tank body 101 for adsorbing ions in the liquid. The ion exchange resin 105 can be a colloid, porous colloid or macroporous cation exchange resin or anion exchange resin. The supply line 102 is connected to the top of the tank body 101 , while the output line 103 is connected to the bottom of the tank body 101 . Meanwhile, between the supply pipeline 102 and the ion exchange resin 105, for example, there are a plurality of distribution pipes 106 connected to the supply pipeline 102, and between the ion exchange resin 105 and the output pipeline 103, for example, there are a plurality of distribution pipes 106 connected to the output pipeline 103. 103 is connected to the water collecting pipe 107. The sampling tubes 104a, 104b, 104c, 104d are arranged on the side wall of the tank 101, and are respectively arranged at different levels to sample the liquid in the ion exchange resin 105 at different heights.

In this embodiment, the sampling tubes 104a, 104b, 104c, and 104d are arranged on the same vertical line of the side wall of the tank body 101 at an equal distance h, wherein the distance between the sampling tube 104a and the top of the ion exchange resin 105 is also h, and The sampling pipe 104d is located on a horizontal line corresponding to the bottom of the ion exchange resin.

But the configuration of the sampling tubes of the present invention is not limited thereto. In the second embodiment, as shown in FIG. 2 , the sampling tubes 104' can be arranged on different vertical lines V1, V2 (as shown by dotted lines). In addition, in other embodiments, the ion exchange resin column has a sampling pipe at the end, which is located at a connection point corresponding to the output pipeline and the tank body. At the same time, those skilled in the art can also adjust the number of sampling pipes, distribution pipes and water collection pipes according to their needs.

Please refer to FIG. 1 , in the first embodiment, after the liquid is introduced into the tank body 101 from the supply pipeline 102 , it will flow through the distribution pipe 106 and enter the ion exchange resin 105 with a height of eg 4h for ion exchange. The ion-exchanged liquid will leave the ion-exchange resin 105 , and the separated liquid will be collected through the water collection pipe 107 , and then exported through the output pipeline 103 to leave the ion-exchange resin tower 100 . The treated liquid can be re-entered into other processing units or used directly. It is worth mentioning that, while the liquid flows through the tank body 101 , the sampling tubes 104 a , 104 b , 104 c , and 104 d can sample the liquid in the ion exchange resin 105 flowing through their heights. These sampling tubes 104a, 104b, 104c, 104d, for example, can be removed from the side wall of the tank body 101, so the liquid in the sampling tubes 104a, 104b, 104c, 104d can be transferred to other places for further analysis.

FIG. 3 is a schematic diagram of a detection system according to a third embodiment of the present invention.

Referring to FIG. 3 , the detection system 200 includes a detection unit 120 and the ion exchange resin tower 100 described in the first embodiment, and the detection unit 120 is used for detecting the liquid sampled by the sampling pipe 104 . It should be noted that the sampling liquid in the sampling tube 104 can be transferred to the detection unit 120, and the transfer method can be connection on the pipeline, or the sampling tube can be extracted from the tank and transported manually. The detection unit 120 can be a probe electrode, a sodium ion detection instrument, a boron detection instrument and a resin detection instrument, so the resistance value, sodium ion concentration, boron ion concentration and resin content in the liquid can be used as the basis for monitoring water quality. It is worth mentioning that since the liquid in the sampling tube 104 does not need to be recovered, the detection unit 120 can perform a destructive or long-term precision analysis on the sampled liquid to further understand the water quality.

The present invention also proposes a detection method, and FIG. 4 is a flowchart of the detection method of the present invention. This detection method can detect the service life of the ion exchange resin 105 in the ion exchange resin tower 100 described in the first embodiment. It should be noted that, in order to clearly illustrate the service life of the ion exchange resin, the ion exchange resin 105 is divided into the ion exchange resin 105a, the ion exchange resin 105b, the ion exchange resin 105c and the ion exchange resin 105d whose height is h. Please refer to FIG. 1 and FIG. 4 at the same time. Firstly, step S401 is performed to determine that the sampling tubes 104a, 104b, 104c, and 104d are at the same level according to the liquids taken from the sampling tubes 104a, 104b, 104c, and 104d at different heights. Whether the high ion exchange resin is saturated, for example, the liquid in the sampling tube 104a can determine whether the resin 105a is saturated. The method for judging resin saturation can be to measure whether the resistance value of the liquid in the sampling tube 104a, 104b, 104c, 104d exceeds the monitoring set value, and the monitoring setting value can be 18M-Ohm, that is, when the resistance value of the liquid in the sampling tube 104a When the value is less than 18M-Ohm, it is considered that the resin 105a is saturated and does not have the ability to exchange ions with the liquid.

Then, proceed to step S402 , according to the flow direction of the liquid in the tank body 101 , sequentially determine whether the ion exchange resin is saturated for the liquid taken out from the remaining sampling tubes. For example, it is judged that the ion exchange resin 105a is saturated by the liquid in the sampling tube 104a, and then, in the order of the sampling tube 104b, the sampling tube 104c and the sampling tube 104d, it is judged that the ion exchange resin 105b, the ion exchange resin 105c and the ion exchange resin 105b are saturated. Whether the exchange resin 105d is saturated.

Next, proceed to step S403, calculate the time difference for the ion exchange resins 105a, 105b, 105c, 105d corresponding to the sampling tubes 104a, 104b, 104c, 104d to reach saturation, so as to estimate the life of the remaining ion exchange resins in the tank body 101 .

The above detection method is described with the fourth embodiment. Please refer to FIG. 1. After the ion exchange resin tower 100 starts to operate, the resistance value of the liquid in the sampling pipes 104a, 104b, 104c, and 104d is detected in real time or regularly. After the resin tower 100 runs for a period of time T1, it is found that the resistance value of the liquid in the sampling pipe 104a is less than 18M-Ohm, while the resistance value of the liquid in the remaining sampling pipes 104b, 104c, and 104d is still greater than 18M-Ohm, indicating that the resin 105a has reached Saturation, that is, the service life of the resin 105a with the height h is T1. Since the total height of the remaining resins 105b, 105c, and 105d is 3h, it can be estimated that the remaining lifetime of the resin is about 3T1, that is, after the resin tower 100 runs for 3T1, the entire ion exchange resin 105 should be renewed.

However, in order to make the method for calculating the service life (or remaining life) of the ion exchange resin 105 more accurate, the time point when the resistance value of the liquid in the sampling tube 104b is less than 18M-Ohm can be continuously recorded. For example, after the T1 time point, when the operation continues for T2, the resistance value of the liquid in the sampling tube 104b starts to be less than 18M-Ohm, while the resistance values of the liquid in the other sampling tubes 104c and 104d are still greater than 18M-Ohm, indicating that the height is h The service life of the resin 105b is T2. At this time, after the correction of T2, it can be assumed that the service life of the resin with a height of h is about (T1+T2)/2. Since the remaining resin 105c and 105d have a total height of 2h, it is estimated that the remaining life of the resin is about T1+ T2. In the same way, after T3, it is found that the resistance value of the liquid in the sampling tube 104c is less than 18M-Ohm, and the service life of the resin whose height h can be corrected again is (T1+T2+T3)/3, and because the remaining resin 105d The height is h, and it is estimated that the resin tower 100 needs to be replaced after the resin tower 100 runs for (T1+T2+T3)/3. Therefore, after the resistance value of the liquid in the sampling tube 104c is found to be less than 18M-Ohm, preparations for resin renewal can be started in sufficient time. Furthermore, the resin service life calculated this time can be used as a reference value for the service life of the same resin next time.

It is worth mentioning that the present invention is not limited to ion exchange resin columns with equally spaced sampling tubes. When the configuration of the sampling tubes is not equidistant, the service life (or remaining life) of the resin is estimated according to the ratio of the sampling tube to the level difference and the corresponding time difference of the resin reaching saturation.

In summary, the ion exchange resin tower of the present invention has a sampling tube. On the one hand, the purpose of real-time monitoring of water quality can be achieved by detecting the liquid in the sampling tube; Precision analysis to ensure the stability of the liquid. Furthermore, the service life (or remaining life) of the ion exchange resin in the ion exchange resin tower can be estimated by sampling at different heights, which can be used as a basis for replacing the resin to avoid replacing resin that has not reached saturation. Therefore, the present invention can monitor water quality and reduce cost effectively.

The above are only preferred feasible embodiments of the present invention, and the embodiments are not intended to limit the scope of patent protection of the present invention, so any equivalent changes made by using the description and accompanying drawings of the present invention shall be equally applied. Included in the patent protection scope of the present invention.

Claims (13)

1. a detection method for calculating the service life of ion-exchange resin in the ion-exchange resin tower, the described ion-exchange resin tower for processing a liquid comprises: A tank body has an ion exchange resin to absorb ions in the liquid; a supply pipeline connected to a top of the tank to introduce the liquid into the tank; an output pipeline connected to a bottom of the tank to lead the treated liquid out of the tank; and A plurality of sampling tubes are arranged on the side wall of the tank body, and each of the sampling tubes is respectively arranged at different levels to sample the liquid in the ion exchange resin; It is characterized in that the detection method includes: Step 1: judging whether the ion exchange resin is saturated at different levels according to the liquid taken out of each sampling tube; and Step 2: According to the flow direction of the liquid in the tank, judge whether the ion exchange resin is saturated for the liquid taken out of the remaining sampling tubes in sequence, and calculate the time difference of each sampling tube corresponding to the saturated ion exchange resin to determine the saturation of the ion exchange resin. The lifetime of the ion exchange resin remaining in the tank is evaluated. 2. The detection method according to claim 1, wherein the method for judging whether the ion exchange resin is saturated comprises measuring whether the resistance value of the liquid exceeds a monitoring set value. 3. The detection method according to claim 2, characterized in that: the monitoring setting value is 18M-Ohm. 4. The detection method according to claim 1, wherein the liquid comprises water. 5. detection method as claimed in claim 1, is characterized in that: described ion exchange resin tower also comprises a plurality of distribution pipes that are connected with described supply line, and described distribution pipe is located between this ion exchange resin and this supply pipe. between roads. 6. detection method as claimed in claim 1, is characterized in that: described ion exchange resin tower also comprises a plurality of water collection pipes that are connected with described output pipeline, and described water collection pipe is positioned at described ion exchange resin and output pipe. between roads. 7. The detection method according to claim 1, characterized in that: the sampling tubes are distributed on the same vertical line. 8. The detection method according to claim 1, characterized in that: the sampling tubes are distributed on different vertical lines. 9. The detection method according to claim 1, characterized in that: the level differences between the sampling tubes are the same. 10. The detection method according to claim 1, wherein the sampling tube can be removed from the side wall of the tank. 11. The detection method according to claim 1, characterized in that: the ion exchange resin tower further comprises a terminal sampling pipe corresponding to the connection point between the output pipeline and the tank body. 12. The detection method according to claim 1, characterized in that, the method also uses a detection unit for detecting the sampling liquid in each sampling tube in the ion exchange resin tower. 13. The detection method according to claim 12, characterized in that: the detection unit comprises a probe electrode.

Images