CN110563085A - Intelligent resin scrubbing end point detection device and method - Google Patents

Abstract

An intelligent device and method for detecting the end point of resin scrubbing. A special sampling pipe is connected to the drain main pipe in the middle of the resin separation tower, the yin tower and the yang tower in the extracorporeal regeneration system of the fine treatment of the power plant, and the end point of the resin scrubbing is installed on the sampling pipe. The detection device is equipped with a solenoid valve interlocked with the program control system of the power plant to control when the detection device is put into use; the resin scrubbing end detection device detects the number of particles in the scrubbing waste liquid online, and sends the switch information of the solenoid valve and the scrubbing waste. The detection result of the particulate matter in the liquid is transmitted to the program control system of the power plant; the equipment under resin scrubbing is determined by the combination of the switch status of the intake valve and the central drain valve, and the amount of particulate matter in the scrubbing waste liquid is detected to judge the resin scrubbing of the tower. The purpose of the invention is to save energy and reduce emissions, reduce the water consumption of resin regeneration, prolong the periodic water production of the polishing mixed bed, and prolong the service life of the resin.

Description

An intelligent resin scrubbing endpoint detection device and method

technical field

The invention relates to an in vitro regeneration system for condensed water and hydrophobic polishing in a power plant, in particular to an intelligent detection device and method for scrubbing end points of in vitro regeneration resin scrubbing.

Background technique

The main process of resin regeneration in domestic power plant polishing system includes the step of air scrubbing. The failed resin in the separation tower needs air scrubbing to remove the adsorbed corrosion products and suspended solids. The separated cation and anion resin in the cation and yin towers need air Scrub to remove fine resin. The purpose of air scrubbing is to remove corrosion products, suspended solids, fine particles, etc. to avoid the blockage of voids on the resin surface, so that the resin can be fully contacted with the regeneration liquid and improve the regeneration effect.

At present, the air scrubbing performed by domestic power plants are all pre-set cycles based on experience. This mode of operation has certain drawbacks, because the concentration of corrosion products and suspended solids in the influent of the finishing system, and the amount of fine resin mixed with the spent resin are constantly changing. If a fixed number of air scrubbing times is set, when the amount of corrosion products and particulate matter in the influent water is high, the scrubbing will be incomplete, which will affect the regeneration effect of the resin, and finally reduce the periodic water production of the finishing mixed bed, which will affect the The safe operation of the unit, and the increase in the number of regenerations will increase the consumption of acid, alkali and demineralized water; when the number of corrosion products and particulate matter in the influent water is low, the resin itself is relatively clean, and the preset scrubbing times will waste a lot of demineralized water. , and will cause the wear of the resin, reduce the life of the resin, and produce more finely divided resin, which makes the power plant increase the amount of resin purchased, resulting in a great economic burden.

Therefore, the current air scrubbing process with a preset number of cycles, although easy to operate, may cause problems such as reducing the periodic water production of the mixed bed, wasting acid and alkali and desalinating water, and reducing the life of the resin, affecting the safe operation of the unit and violating the The tenet of "energy saving and emission reduction, quality improvement and efficiency improvement".

SUMMARY OF THE INVENTION

In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide an intelligent resin scrubbing end point detection device and method, which can intelligently judge the resin scrubbing end point, so as to reduce the water consumption for regeneration and prolong the period of water production in the polishing mixed bed. and resin life.

To achieve the above object, the present invention adopts the following technical solutions:

An intelligent resin scrubbing end-point detection device, comprising a special sampling pipe connected to the resin separation tower 1, the yin tower 2 and the middle drainage main pipe of the yang tower 3 in the fine treatment in vitro regeneration system of the power plant, and installed on the special sampling pipe The resin scrubbing end detection device 13 on the upper part is installed at the inlet of the resin scrubbing end detection device 13 and is controlled by the power plant program control system to control the solenoid valve 12 when the resin scrubbing end detection device 13 is put into use; online detection of the resin scrubbing end detection device 13 Scrub the amount of particulate matter in the waste liquid, and transmit the switch information of the solenoid valve 12 and the detection result of the particulate matter amount in the scrubbing waste liquid into the program control system of the power plant. The switch status of the middle drain valve is combined to determine whether the resin scrubbing is being performed on the resin separation tower 1, the negative tower 2 or the positive tower 3. At the same time, the solenoid valve 12 at the inlet of the resin scrubbing end point detection device 13 is opened to detect the amount of particulate matter in the scrubbing waste liquid. To judge the end point of resin scrubbing in resin separation tower 1, yin tower 2 and yang tower 3, so as to determine the number of times of resin scrubbing in resin separation tower 1, yin tower 2 and yang tower 3.

A resin scrubbing end-point detection device 13 is used to detect the resin scrubbing effect of the resin separation tower 1 , the cathode tower 2 and the anode tower 3 .

Preferably, the resin scrubbing endpoint detection device 13 is an online detection turbidimeter.

The detection method of the intelligent resin scrubbing endpoint detection device is as follows: when the resin separation tower 1 performs resin scrubbing, open the roots blower 4, open the exhaust valve 14, and close the exhaust after 30 seconds of exhaust. Valve 14, opens the resin separation tower middle part drain valve 9 of resin separation tower 1, resin separation tower inlet valve 6 and resin separation tower upper exhaust valve 15, adjusts the intake volume and pressure with resin separation tower inlet valve 6, carries out. Resin scrubbing in resin separation tower 1; When Yin tower 2 carries out resin scrubbing, open the Yin tower middle drain valve 10, Yin tower air inlet valve 7 and Yin tower upper exhaust valve 16 of Yin tower 2, use the Yin tower air inlet valve 7. Adjust the air intake and pressure, and carry out the resin scrubbing in the yin tower 2; when the yang tower 3 carries out the resin scrubbing, open the yang tower middle drain valve 11, the yang tower air inlet valve 8 and the upper part exhaust valve of the yang tower 3. 17. Use the yang tower air inlet valve 8 to adjust the air intake volume and pressure, and carry out the resin scrubbing in the yang tower 3;

The solenoid valve 12 is powered on to open the resin scrubbing end detection device 13. When the power plant program control system detects that the resin separation tower middle drain valve 9 and the resin separation tower inlet valve 6 are opened, it is judged that the resin separation tower 1 is performing resin scrubbing, and at the same time Detect the number of particles in the scrubbing waste liquid. When the number of particles above 2 μm in the scrubbing waste liquid is less than or equal to 500/ml, it is determined that the scrubbing of resin separation tower 1 is completed, which is the end point of resin scrubbing, and the number of resin scrubbing of resin separation tower 1 is recorded; When the program control system of the power plant detects that the drain valve 10 in the middle of the yin tower and the inlet valve 7 of the yin tower are open, it is judged that the yin tower 2 is performing resin scrubbing, and at the same time, the amount of particulate matter in the scrubbing waste liquid is detected. When 500/ml, it is determined that the scrubbing of the yin tower 2 is completed, which is the end point of resin scrubbing, and the number of times of resin scrubbing of the yin tower 2 is recorded; It is judged that the positive tower 3 is performing resin scrubbing, and at the same time, the number of particles in the scrubbing waste liquid is detected. When the number of particles above 2 μm in the scrubbing waste liquid is less than or equal to 500 particles/ml, it is determined that the scrubbing of the positive tower 3 is completed, which is the end point of resin scrubbing, and the positive value is recorded. Column 3 Number of resin scrubs.

Preferably, in order to prolong the service life of the resin scrubbing end detection device 13, the resin scrubbing end detection device 13 is not put into the resin scrubbing for the first time, the program control system controls the solenoid valve 12 to close, and the resin separation tower 1, the negative tower 2 and the positive tower 3 The drainage in the middle drainage main pipe directly enters the waste resin trap 5 .

Compared with the prior art, the function of the method of the present invention is to avoid unnecessary scrubbing times, save energy and reduce emissions, reduce the water consumption for resin regeneration, prolong the periodical water production of the finishing mixed bed, and prolong the Resin life and avoids incomplete scrubbing when the amount of corrosion products and particulates in the incoming water is high. The resin scrubbing effect of the three towers can be detected by a resin scrubbing end point detection device 13 .

Description of drawings

Fig. 1 is a schematic diagram of an intelligent resin scrubbing end-point detection device installed in a power plant refining in vitro regeneration system according to the present invention.

Detailed ways

As shown in Figure 1, a kind of intelligent resin scrubbing end point detection device of the present invention is connected with a special sampling pipe on the resin separation tower 1, the yin tower 2 and the middle drainage main pipe of the yang tower 3 in the power plant's fine treatment in vitro regeneration system , install the resin scrubbing end-point detection device 13 on the special sampling pipe, and at the inlet of the resin scrubbing end-point detection device 13 there is a solenoid valve 12 interlocked with the power plant program control system to control when the detection device 13 is put into use. The main function of the resin scrubbing end detection device 13 is to detect the amount of particulate matter in the scrubbing waste liquid online, and transmit the switch information of the solenoid valve 12 and the detection result of the particle amount in the scrubbing waste liquid into the power plant program control system. The equipment under resin scrubbing is determined by the combination of the opening and closing status of the inlet valve and the middle drain valve of the resin separation tower 1, the yin tower 2 and the yang tower 3, and the solenoid valve 12 at the inlet of the resin scrubbing end point detection device 13 is opened at the same time to detect the scrubbing. The number of particles in the waste liquid is used to judge the end point of resin scrubbing of the resin separation tower 1, the yin tower 2 and the yang tower 3, so as to determine the number of times required for the resin scrubbing of the resin separation tower 1, the yin tower 2 and the yang tower 3.

The specific detection method is as follows: the solenoid valve 12 is powered on to turn on the resin scrubbing end detection device, and when the program control system of the power plant detects that the drain valve 9 in the middle of the resin separation tower and the inlet valve 6 of the resin separation tower are opened, it is judged that the resin separation tower 1 is in the process of Resin scrubbing, and detecting the number of particles in the scrubbing waste liquid. When the number of particles above 2 μm in the scrubbing waste liquid is less than or equal to 500 particles/ml, it is determined that the scrubbing of resin separation tower 1 is completed, which is the end point of resin scrubbing, and the resin scrubbing of resin separation tower 1 is recorded. When the program control system of the power plant detects that the drain valve 10 in the middle of the yin tower and the inlet valve 7 of the yin tower are open, it is judged that the yin tower 2 is performing resin scrubbing, and at the same time, the number of particles in the scrubbing waste liquid is detected. When the number of particles is less than or equal to 500/ml, it is determined that the scrubbing of the negative tower 2 is completed, which is the end point of the resin scrubbing, and the number of resin scrubbing of the negative tower 2 is recorded; When it is turned on, it is judged that the positive tower 3 is performing resin scrubbing, and at the same time, the amount of particulate matter in the scrubbing waste liquid is detected. When the number of particles above 2 μm in the scrubbing waste liquid is less than or equal to 500/ml, it is determined that the positive tower 3 scrubbing is completed, that is, the resin scrubbing end point. , and record the number of times of resin scrubbing of Yangta 3.

In order to prolong the service life of the resin scrubbing end detection device 13, the resin scrubbing end detection device 13 is not put into the resin scrubbing for the first time, the program control system controls the solenoid valve 12 to close, and the resin separation tower 1, the yin tower 2 and the yang tower 3 are drained in the middle. Drainage in the pipe goes directly into the waste resin trap 5 .

Effect verification

The original preset number of cycles of air scrubbing in the separation tower of a power plant in the south is 5 times. After installing the intelligent resin scrubbing end point detection device, in the process of one air scrubbing, it will stop after 4 cycles and go to the next step. . The recorded data of the intelligent resin scrubbing endpoint detection device shows that the number of particles above 2 μm in the first scrubbing waste liquid is 6285/ml, and the number of particles above 2 μm in the second scrubbing waste liquid is 3481/ml. The number of particles larger than 2 μm in the 3rd scrub waste liquid was 1470 particles/ml, and the number of particles larger than 2 μm in the fourth scrub waste liquid was 368 particles/ml. Follow-up tracking of the operation records of air scrubbing shows that the number of air scrubbing in this power plant is mostly 4 times, the lowest is 3 times, and the highest is 6 times.

The original preset number of cycles of air scrubbing in the separation tower of a power plant in the middle of the country is 5 times. After adding an intelligent resin scrubbing end point detection device, in the process of one air scrubbing, after 5 cycles are performed, it will terminate and proceed to the next step. . The recorded data of the intelligent resin scrubbing endpoint detection device shows that the number of particles above 2 μm in the first scrubbing waste liquid is 5164/ml, and the number of particles above 2 μm in the second scrubbing waste liquid is 2278/ml. The number of particles larger than 2μm in the 3rd scrubbing waste liquid was 944/ml, the number of particles larger than 2μm in the 4th scrubbing waste liquid was 622/ml, and the number of particles larger than 2μm in the 5th scrubbing waste liquid was 483 /ml. Subsequent tracking of the operation records of air scrubbing shows that the number of air scrubbing in this power plant is mostly 6 times, the lowest is 5 times, and the highest is 8 times.

By applying the intelligent resin scrubbing end point detection device, in addition to ensuring the intelligent control of the air scrubbing end point, the rationality of the air scrubbing operation parameters can also be checked. For example, in a power plant in the middle of the above-mentioned power plant, it was found through tracking that the number of air scrubbing was high, the number of particles in the scrubbing waste liquid decreased slowly during the last few cycles, and the scrubbing effect was not good. As a result, the resin scrubbing in the separation tower is not sufficient, and eventually the scrubbing effect is not good.

Claims (5)

1. an intelligent resin scrubbing end-point detection device, is characterized in that: comprise the resin separation tower (1), the yin tower (2) and the yang tower (3) middle drain main pipe that are connected in the power plant finishing external regeneration system The special sampling pipe on the device, the resin scrubbing end point detection device (13) installed on the special sampling pipe, installed at the inlet of the resin scrubbing end point detection device (13) is controlled by the power plant program control system to control the resin scrubbing end point detection device (13) When is the solenoid valve (12) put into use; the online detection device (13) of the resin scrubbing end point detection device (13) detects the number of particles in the scrubbing waste liquid, and transmits the switch information of the solenoid valve (12) and the detection result of the particle amount in the scrubbing waste liquid. In the program control system of the power plant, it is determined that the resin separation tower (1) is being scrubbed by the combination of the opening and closing status of the inlet valve and the central drain valve of the resin separation tower (1), the yin tower (2) and the yang tower (3). ), the negative tower (2) or the positive tower (3), and simultaneously open the solenoid valve (12) at the inlet of the resin scrubbing end detection device (13) to detect the amount of particulate matter in the scrubbing waste liquid to determine the resin separation tower (1), the negative The end point of resin scrubbing in the column (2) and the yang column (3), thereby determining the number of resin scrubbing in the resin separation column (1), the yin column (2) and the yang column (3). 2. a kind of intelligent resin scrubbing end detection device according to claim 1 is characterized in that: detect resin separation tower (1), negative tower (2) and positive electrode by a resin scrubbing end detection device (13) Resin scrubbing effect of tower (3). 3. An intelligent resin scrubbing endpoint detection device according to claim 1, characterized in that: the resin scrubbing endpoint detection device (13) is an online detection turbidimeter. 4. the detection method of the intelligent resin scrubbing end point detection device described in any one of claim 1 to 3, it is characterized in that: concrete method is as follows: when resin separation tower (1) carries out resin scrubbing, open Roots blower ( 4), open the exhaust valve (14), after 30 seconds of exhaust, close the exhaust valve (14), open the resin separation tower middle drain valve (9) of the resin separation tower (1), and the resin separation tower inlet valve ( 6) and resin separation tower upper exhaust valve (15), with resin separation tower inlet valve (6) to adjust air intake and pressure, carry out resin scrubbing in resin separation tower (1); When scrubbing, open the drain valve (10) in the middle of the yin tower (2), the air inlet valve (7) and the exhaust valve (16) in the upper part of the yin tower, and use the air inlet valve (7) to adjust the air intake. amount and pressure, carry out resin scrubbing in the yin tower (2); when the yang tower (3) is scrubbed with resin, open the drain valve (11) in the middle of the yang tower (3), the air inlet valve (8) and The upper exhaust valve (17) of the yang tower is used to adjust the air intake volume and pressure with the yang tower air inlet valve (8), and the resin in the yang tower (3) is scrubbed; The solenoid valve (12) is powered on to turn on the resin scrubbing end detection device (13). When the program control system of the power plant detects that the drain valve (9) in the middle of the resin separation tower and the inlet valve (6) of the resin separation tower are open, it is judged that the resin is separated. The tower (1) is performing resin scrubbing, and at the same time, the number of particles in the scrubbing waste liquid is detected. When the number of particles above 2 μm in the scrubbing waste liquid is ≤ 500/ml, it is determined that the resin separation tower (1) scrubbing ends, which is the end point of resin scrubbing. , record the number of times of resin scrubbing of the resin separation tower (1); when the program control system of the power plant detects that the drain valve (10) in the middle of the yin tower and the inlet valve (7) of the yin tower are open, it is judged that the yin tower (2) is performing resin scrubbing At the same time, the number of particles in the scrubbing waste liquid is detected. When the number of particles above 2 μm in the scrubbing waste liquid is ≤ 500/ml, it is determined that the scrubbing of the Yin tower (2) is completed, which is the end point of the resin scrubbing, and the resin scrubbing of the Yin tower (2) is recorded. When the program control system of the power plant detects that the drain valve (11) in the middle of the yang tower and the inlet valve (8) of the yang tower are open, it is judged that the yang tower (3) is performing resin scrubbing, and at the same time, the amount of particulate matter in the scrubbing waste liquid is detected. When the number of particles above 2 μm in the scrubbing waste liquid is less than or equal to 500 particles/ml, it is determined that the scrubbing of the positive tower (3) is completed, which is the end point of resin scrubbing, and the number of resin scrubbing of the positive tower (3) is recorded. 5. detection method according to claim 4 is characterized in that: in order to prolong the service life of resin scrubbing end-point detection device (13), do not drop into resin scrubbing end-point detection device (13) during resin scrubbing for the first time, program-controlled system controls The solenoid valve (12) is closed, and the drainage in the middle drainage main pipe of the resin separation tower (1), the female tower (2) and the male tower (3) directly enters the waste resin trap 5.