System and method for judging air scrubbing end point in regeneration process of fine treatment resin

Abstract

The invention discloses a system and a method for judging an air scrubbing end point in a fine treatment resin regeneration process, and relates to the technical field of condensation water fine treatment resin regeneration, the system comprises a resin separation tower, and drainage pipes and exhaust pipes of the resin separation tower, a negative regeneration tower and a positive regeneration tower are connected through a bottom drainage main pipe; a sampling pipe is arranged on the main drainage pipe and is connected with a resin scrubbing monitor; and the resin scrubbing monitor is used for measuring the scrubbing drainage turbidity of the resin separation tower, the negative regeneration tower and the positive regeneration tower and the content of key monitoring ions in water. The resin scrubbing process of the three reaction towers can be monitored by using one resin scrubbing monitor, and the resin scrubbing step sequence is optimized by using turbidity and pollutant absorption peaks, so that the purposes of reducing regeneration water consumption, ensuring the resin scrubbing effect and prolonging the service life of the resin are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of condensate polishing resin regeneration, and particularly to a system and method for judging the end point of air scrubbing during the regeneration of polishing resin. Background Art

[0002] At present, the condensate polishing system in domestic power plants mainly adopts the resin external regeneration technology, and the air scrubbing procedure is bound to be included during the resin regeneration process. When externally regenerating the failed resin, the resin regeneration separation tower uses air scrubbing to remove the corrosion products, suspended solids and fine resins adsorbed on the resin surface, so that the resin and the regeneration liquid can fully contact, improving the regeneration effect; the cation and anion resin regeneration towers use air scrubbing to remove the fine resins and excess acid and alkali generated during the regeneration process.

[0003] However, in the current resin regeneration operation of domestic power plants, the number of cycles of the air scrubbing procedure is set according to experience. This operation mode has defects because the concentration of corrosion products and suspended solids in the influent water of the polishing system and the amount of fine resins mixed in the failed resin are constantly changing. If the scrubbing procedure is set to a fixed number of cycles, when the corrosion products and suspended solids on the surface of the failed resin are high, the air scrubbing is incomplete, affecting the regeneration effect; when the corrosion products and suspended solids on the surface of the failed resin are low, the air scrubbing is excessive, reducing the service life of the resin.

[0004] Therefore, although the air scrubbing operation is convenient by presetting the number of cycles, it will result in poor resin regeneration effect and shortened resin service life, thereby reducing the cycle water production capacity of the high-speed mixed bed and increasing the resin procurement volume. Summary of the Invention

[0005] In view of the problems existing in the existing condensate polishing system of power plants, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is that when the scrubbing procedure is set to a fixed number of cycles, when the corrosion products and suspended solids on the surface of the failed resin are high, the air scrubbing is incomplete, affecting the regeneration effect.

[0007] To solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides a system for judging the end point of air scrubbing during the regeneration of polishing resin, which includes,

[0009] A resin separation tower, the drain pipes and exhaust pipes of the resin separation tower, the anion regeneration tower and the cation regeneration tower are connected through a bottom drain main pipe;

[0010] A sampling pipe is provided on the drain main pipe, and the sampling pipe is connected to a resin scrubbing monitor;

[0011] The resin scrubbing monitor is used to measure the turbidity of the scrubbing drainage water and the content of key monitored ions in water in the resin separation tower, the anion regeneration tower, and the cation regeneration tower.

[0012] As a preferred embodiment of the air scrubbing end point judgment system in the fine treatment resin regeneration process of the present invention, wherein: the resin scrubbing monitor includes a turbidity sensor, a UV spectrophotometer, and a compressed air purging pipeline;

[0013] The compressed air purging pipeline is connected to the inside of the resin scrubbing monitor and is used to keep the turbidity flow cell and the spectral sample cell in the monitor clean.

[0014] As a preferred embodiment of the air scrubbing end point judgment system in the fine treatment resin regeneration process of the present invention, wherein: solenoid valves and manual valves are provided on the sampling pipe, the compressed air purging pipe, the turbidity flow cell, and the spectral sample cell; the manual valve is located in front of the solenoid valve, and the manual valve facilitates the replacement of the solenoid valve and the maintenance of the unit.

[0015] As a preferred embodiment of the air scrubbing end point judgment system in the fine treatment resin regeneration process of the present invention, wherein: the sampling pipeline is connected to the resin scrubbing monitor, and a constant flow pump is installed on the water inlet pipe inside the resin scrubbing monitor; when the water pressure in the drainage main pipe changes, the constant flow pump stabilizes the flow to ensure the stability of the water samples in the turbidity flow cell and the spectral sample cell and reduce the detection error.

[0016] As a preferred embodiment of the air scrubbing end point judgment system in the fine treatment resin regeneration process of the present invention, wherein: a thermometer is provided on the resin scrubbing monitor to provide noise reduction calculation parameters for the detection processes of the turbidity sensor and the UV spectrophotometer, and at the same time, an alarm is sent to the DCS system when the temperature is abnormal.

[0017] In a second aspect, an intelligent monitoring method for the production planning of an ultra-large power grid in a power system according to an embodiment of the present invention includes:

[0018] Monitoring the turbidity of demineralized water to obtain the background turbidity value;

[0019] Collecting the failed resin, analyzing the pollutant components of the failed resin, and determining the absorption peak of the pollutants in the visible light region;

[0020] Setting a point scan of the absorption peak, and separating and scrubbing the failed resin;

[0021] Judging the end point of the scrubbing and verifying the end point;

[0022] When the end point verification passes, pollutant monitoring is performed, and if it passes, the result is output, otherwise an alarm signal is output.

[0023] As a preferred embodiment of the method for judging the end point of air scrubbing in the polishing resin regeneration process of the present invention, wherein: the scrubbing includes,

[0024] After the resin scrubbing monitor determines that the scrubbing step is put into operation, the resin scrubbing monitor starts to operate, detects the turbidity Z of the drained water main pipe after scrubbing through the resin scrubbing monitor, and counts the scrubbing process of the current reaction tower, which is counted as the nth time.

[0025] As a preferred embodiment of the method for judging the end point of air scrubbing in the polishing resin regeneration process of the present invention, wherein: judging the end point of the scrubbing includes,

[0026] When it is detected that Z = b to 2b, where b is the turbidity of the demineralized water for regeneration, start to judge the scrubbing end point E

[0027] (t) whether the following occurs:

[0028]

[0029] wherein, f(t) is the function between the fitted turbidity Z and time t during the monitoring of the nth scrubbing process; t 0 is the time point corresponding to when Z = b to 2b; t 1 is after t 0 the time point at which the derivative becomes 0 appears.

[0030] As a preferred embodiment of the method for judging the end point of air scrubbing in the polishing resin regeneration process of the present invention, wherein: verifying the end point includes,

[0031] After the scrubbing end point E(t) that meets the conditions appears, verify whether this time point is correct through the verification constant C. Take m / 2 unit times before and after t respectively, where m is an even number and greater than 10;

[0032] Judge whether the scrubbing end point E(t) is correct according to the verification constant C: when the main pollutant component is iron oxide, if C ≤ 2, the scrubbing end point E is correct and proceed to the next step; if C > 2, continue cyclic scrubbing until C ≤ 2. When the main pollutant component is a mixture of iron and oil, if C ≤ 1, the scrubbing end point E is correct and proceed to the next step; if C > 1, continue cyclic scrubbing until C ≤ 1. When the main pollutant component is organic matter, the limit value of the verification constant C needs to be determined through on-site tests.

[0033] When the scrubbing count n of the monomer reaction tower ≥ 4 and the verification constant C is still greater than the limit value, an alarm signal is output for on-site manual judgment.

[0034] When C is less than the limit value and the scrubbing end point E is correctly judged, the water sample enters the sample cell of the UV spectrophotometer. After scanning the absorption points of the main pollutants, it is compared with the original absorption peak of the pollutants on the failed resin. If the scanned peak values are all lower than the original absorption peak, the scrubbing is ended, and the resin scrubbing monitor sends a skip signal to the DCS; if the scanned peak values are higher than the original absorption peak or abnormal peaks appear, the resin scrubbing monitor outputs an alarm signal, records the abnormal information, makes an on-site judgment manually, and checks the condensate polishing process.

[0035] The verification constant is calculated by the following formula:

[0036]

[0037] Where, △Z is the turbidity change value per unit time, and △t is the unit time.

[0038] As a preferred scheme of the method for judging the air scrubbing end point during the regeneration of the polishing resin described in the present invention, wherein: the pollutant monitoring includes,

[0039] When the scrubbing count n of the monomer reaction tower is ≥ 4 and the verification constant C is still greater than 1, an alarm signal is output and an on-site judgment is made manually;

[0040] When C is less than the limit value and the scrubbing end point E is correctly judged, the water sample enters the sample cell of the UV spectrophotometer. After scanning the absorption points of the main pollutants, it is compared with the original absorption peak of the pollutants on the failed resin. If the scanned peak values are all lower than the original absorption peak, the scrubbing is ended, and the resin scrubbing monitor sends a skip signal to the DCS; if the scanned peak values are higher than the original absorption peak or abnormal peaks appear, the resin scrubbing monitor outputs an alarm signal, records the abnormal information, makes an on-site judgment manually, and checks the condensate polishing process.

[0041] The beneficial effect of the present invention is that a resin scrubbing monitor can be used to monitor the resin scrubbing process of three reaction towers, and the resin scrubbing sequence is optimized by using turbidity and pollutant absorption peaks, so as to achieve the purpose of reducing the water consumption of regeneration, ensuring the resin scrubbing effect, and prolonging the service life of the resin. Specifically, this method judges the scrubbing end point according to the function curve fitted by the turbidity value and time, and verifies this end point. The water sample that passes the verification is subjected to water vapor quality analysis to ensure the effect after scrubbing optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0043] Figure 1 This is a schematic diagram of the structure of the air scrubbing endpoint judgment system during the regeneration process of the fine treatment resin.

[0044] Figure 2 The present invention is a flow chart of air scrubbing endpoint judgment during the resin regeneration process of the fine treatment resin regeneration process air scrubbing endpoint judgment system.

[0045] Figure 3 This is a comparison chart of experimental data of the air scrubbing endpoint judgment system during the regeneration process of fine treatment resin. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0049] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0050] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] Unless otherwise clearly specified and defined in the present invention, the terms "installation, connection, and coupling" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or it may be indirectly connected through an intermediate medium, or it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Example 1

[0053] Referring to Figure 1 and Figure 2 , this is the first embodiment of the present invention. This embodiment provides a system for judging the end point of air scrubbing during the regeneration of polished treatment resin, including:

[0054] First, detect the turbidity value of the demineralized water used and calibrate it as the background turbidity value b. Collect the failed resins in each high-speed mixed bed and scrub the failed resins with an ultrasonic vibration shaker. Use an ion analysis chromatograph to determine the components in the eluate of the failed resins, consult relevant literature or compare with standard chromatograms, and determine the main pollutant components according to the peak height and peak area in the chromatogram. Sort the main pollutant components from high to low according to the mass fraction, and use standard chemical reagents to determine the characteristic absorption peaks of the top two main pollutants in the ultraviolet-visible light absorption spectrum, and set this peak value as a point scan in a UV spectrophotometer. When multiple pollutants coexist are found by the ion analysis chromatograph, use a Fourier transform infrared spectrometer to calibrate the main pollutant components of the failed resins according to the spectrum diagram. As described above, determine the ultraviolet-visible absorption spectra of the top two main pollutant components. After determining the absorption peak values of the top two main pollutant components, set this peak value as a point scan in a UV spectrophotometer.

[0055] Then, transport the failed resins to the resin separation tower, perform the air scrubbing cycle sequence of the resins in the resin separation tower, and transport the separated anion resins and cation resins to the anion regeneration tower and cation regeneration tower respectively. In the anion regeneration tower and cation regeneration tower, the scrubbing sequence is cycled.

[0056] When the scrubbing sequence cycle starts, the resin scrubbing monitor judges the scrubbing state in the reaction tower through the opening and closing signals of the solenoid valves in the DCS. After judging that the scrubbing sequence is put into operation, the resin scrubbing monitor starts to run, detects the turbidity Z of the drain header after scrubbing through the resin scrubbing monitor, and counts the scrubbing process of the current reaction tower, which is counted as the nth time.

[0057] When it is detected that Z = b to 2b, where b is the turbidity of the demineralized water for regeneration, start to judge whether the scrubbing end point E(t) appears:

[0058]

[0059] Among them, f(t) is the function between the fitted turbidity Z and time t during the nth scrubbing process monitoring. f(t) is a function obtained by fitting the turbidity Z and time t detected at the preset acquisition frequency (0.5 - 1 s / time) through MATLAB regression analysis; t 0 is the corresponding time point when Z = b to 2b; t 1 is at t 0 afterwards, the time point when the derivative is 0 appears.

[0060] After the scrubbing end point E(t) that meets the conditions appears, the constant C is used to verify whether this time point is correct. Take m / 2 unit times before and after t respectively, where m is an even number and greater than 10.

[0061]

[0062] Among them, △Z is the turbidity change value per unit time, and △t is the unit time.

[0063] Judge whether the scrubbing end point E(t) is correct according to the verification constant C: When the main pollutant component is iron oxide, if C ≤ 2, the scrubbing end point E is correct and proceed to the next step; if C > 2, continue the cyclic scrubbing until C ≤ 2. When the main pollutant component is a mixture of iron and oil, if C ≤ 1, the scrubbing end point E is correct and proceed to the next step; if C > 1, continue the cyclic scrubbing until C ≤ 1. When the main pollutant component is organic matter, the limit value of the verification constant C needs to be determined through on-site tests.

[0064] Furthermore, if the scrubbing count n of the monomer reaction tower ≥ 4 and the verification constant C is still greater than the limit value, an alarm signal is output for on-site manual judgment.

[0065] When C is less than the limit value and the scrubbing end point E is judged correctly, the water sample enters the sample cell of the UV spectrophotometer. After the main pollutant absorption light point scan, it is compared with the original absorption peak of the pollutant on the failed resin. If the scanned peak values are all lower than the original absorption peak, the scrubbing ends, and the resin scrubbing monitor sends a skip signal to the DCS; if the scanned peak values are higher than the original absorption peak or abnormal peaks appear, the resin scrubbing monitor outputs an alarm signal, records the abnormal information, makes an on-site manual judgment, and checks the condensate polishing process.

[0066] Furthermore, this embodiment also provides an intelligent monitoring system for the ultra-large scale power grid production planning of a power system, including:

[0067] Resin separation tower, anion regeneration tower, cation regeneration tower, resin scrubbing monitor, and resin catcher. The drain pipes and exhaust pipes of the resin separation tower, anion regeneration tower, and cation regeneration tower are connected through a bottom drain main pipe. A sampling pipe is provided on the drain main pipe, which is connected to the resin scrubbing monitor. The resin scrubbing monitor is used to measure the turbidity of the scrubbing drainage water and the content of key monitored ions in the water of the resin separation tower, anion regeneration tower, and cation regeneration tower. The resin scrubbing monitor drains water to the trench.

[0068] The resin scrubbing monitor includes a turbidity sensor, a UV spectrophotometer, and a compressed air flushing pipeline. The compressed air flushing pipeline is connected to the inside of the resin scrubbing monitor and is used to keep the turbidity flow cell and the spectral sample cell in the monitor clean.

[0069] Solenoid valves and manual valves are provided on the sampling pipe, the compressed air flushing pipe, the turbidity flow cell, and the spectral sample cell. The manual valve is located in front of the solenoid valve, and the manual valve facilitates the replacement of the solenoid valve and the unit maintenance.

[0070] The sampling pipeline is connected to the resin scrubbing monitor, and a constant flow pump is installed on the inlet water pipe inside the resin scrubbing monitor. When the water pressure of the drain main pipe changes, the constant flow pump stabilizes the flow to ensure the stability of the water samples in the turbidity flow cell and the spectral sample cell and reduce the detection error.

[0071] A thermometer is provided on the resin scrubbing monitor to provide noise reduction calculation parameters for the detection processes of the turbidity sensor and the UV spectrophotometer, and at the same time, it alarms the DCS system when the temperature is abnormal.

[0072] This embodiment also provides a computer device, which is applicable to the situation of the air scrubbing end point judgment system in the fine treatment resin regeneration process, including a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the air scrubbing end point judgment system in the fine treatment resin regeneration process proposed in the above embodiment.

[0073] The computer device may be a terminal, which includes a processor, a memory, a communication interface, a display screen, and an input device connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner, and the wireless manner can be achieved through WIFI, carrier networks, NFC (Near Field Communication), or other technologies. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball, or touchpad provided on the computer device housing, or an external keyboard, touchpad, or mouse, etc.

[0074] This embodiment also provides a storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the air scrubbing end point judgment system for the fine treatment resin regeneration process as proposed in the above embodiment.

[0075] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. The technical details not described in detail in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0076] Embodiment 2

[0077] This is the second embodiment of the present invention. This embodiment provides an air scrubbing end point judgment system for the fine treatment resin regeneration process. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0078] Taking a power plant in the north as an example, during the regeneration process of the resin for condensate polishing, the preset scrubbing times in the separation tower are 3 times, and there is a problem of incomplete scrubbing. After using the resin scrubbing monitor, it is put into operation during the second scrubbing to monitor the effect of the third scrubbing. If the scrubbing end point is not detected during the third scrubbing, the fourth scrubbing is carried out, as Figure 3 shown. After adopting the scrubbing end point judgment method described in Embodiment 1, the problem of incomplete scrubbing of the failed resin is effectively solved.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An air scrubbing endpoint judgment system in the regeneration process of fine treatment resin, characterized in that: include, A resin separation tower, wherein the drain pipes of the resin separation tower, the anion regeneration tower and the yang regeneration tower are connected to the exhaust pipe via a bottom drain main pipe; A sampling tube is provided on the main drainage pipe, and the sampling tube is connected to a resin scrubbing monitor; The resin scrubbing monitor is used to measure the turbidity of scrubbing drainage from the resin separation tower, the anion regeneration tower and the cation regeneration tower and the key monitored ion content in the water.

2. The air scrubbing endpoint judgment system in the regeneration process of the fine treatment resin according to claim 1, characterized in that: The resin scrubbing monitor includes a turbidity sensor, a UV spectrophotometer and a compressed air purge pipeline; The compressed air purge pipeline is connected to the inside of the resin scrubbing monitor and is used to keep the turbidity flow cell and the spectrum sample cell in the monitor clean.

3. The air scrubbing endpoint judgment system in the regeneration process of the fine treatment resin according to claim 2, characterized in that: The sampling tube, compressed air purge tube, turbidity flow cell and spectrum sample cell are all provided with electromagnetic valves and manual valves; the manual valve is located at the front side of the electromagnetic valve, and the manual gate can facilitate the replacement of the electromagnetic valve and the maintenance of the unit.

4. The air scrubbing endpoint judgment system in the regeneration process of the fine treatment resin according to claim 3, characterized in that: The sampling pipeline is connected to the resin scrubbing monitor, and a constant flow pump is installed on the water inlet pipe inside the resin scrubbing monitor; when the water pressure of the drainage main pipe changes, the constant flow pump stabilizes the flow to ensure the stability of water samples in the turbidity flow pool and the spectrum sample pool, thereby reducing detection errors.

5. The air scrubbing endpoint judgment system in the regeneration process of the fine treatment resin according to claim 4, characterized in that: The resin scrubbing monitor is provided with a thermometer to provide noise reduction calculation parameters for the turbidity sensor and UV spectrophotometer detection process, and to alarm the DCS system when the temperature is abnormal.

6. A method for determining the end point of air scrubbing during the regeneration process of a fine treatment resin, based on the system for determining the end point of air scrubbing during the regeneration process of a fine treatment resin according to any one of claims 1 to 5, characterized in that: include, Monitor the turbidity of deionized water to obtain the background turbidity value; Collecting failed resin, analyzing the pollutant components of the failed resin, and determining the absorption peak of the pollutant in the visible light region; Setting a point scan of the absorption peak, and separating and scrubbing the failed resin; Determining the end point of the scrubbing and verifying the end point; When the endpoint verification is passed, pollutant monitoring is performed, and if it passes, the result is output, otherwise an alarm signal is output.

7. The method for determining the air scrubbing endpoint in the regeneration process of the fine treatment resin according to claim 6, characterized in that: The scrubbing comprises, When the resin scrubbing monitor determines that the scrubbing step is put into operation, the resin scrubbing monitor starts to operate, detects the turbidity Z of the main drainage pipe after scrubbing, and counts the scrubbing process of the current reaction tower, which is counted as the nth time.

8. The method for determining the air scrubbing endpoint in the regeneration process of the fine treatment resin according to claim 7, characterized in that: Determining the end point of the scrubbing includes, When Z=b~2b is detected, where b is the turbidity of the desalted water for regeneration, it is determined whether the scrubbing end point E(t) appears: Among them, f(t) is the function between the fitted turbidity Z and time t during the monitoring of the nth scrubbing process; t0 is the corresponding time point when Z=b~2b; t1 is the time point after t0 when the derivative is 0.

9. The method for determining the air scrubbing endpoint in the regeneration process of the fine treatment resin according to claim 8, characterized in that: Verification of the endpoints includes, When the scrubbing endpoint E(t) that meets the conditions appears, the time point is verified to be correct by verifying the constant C. m / 2 unit time is taken before and after t, where m is an even number and greater than 10; Determine whether the scrubbing end point E(t) is correct based on the verification constant C: When the main pollutant is iron oxide, if C≤2, the scrubbing end point E is correct and proceed to the next step; if C>2, continue to scrub in a cycle until C≤2. When the main pollutant is a mixture of iron and oil, if C≤1, the scrubbing end point E is correct and proceed to the next step; if C>1, continue to scrub in a cycle until C≤1. When the main pollutant is organic matter, the limit value of the verification constant C needs to be determined through on-site tests. When the monomer reaction tower scrubbing count n≥4 and the verification constant C is still greater than the limit value, an alarm signal is output and manual judgment is made on site. When C is less than the limit value and the scrubbing end point E is judged correctly, the water sample enters the sample pool of the UV spectrophotometer, and after the absorption light spot scan of the main pollutants, it is compared with the original absorption peak of the pollutants on the failed resin. If the peak values ​​of the spot scan are all lower than the original absorption peak, the scrubbing is completed, and the resin scrubbing monitor sends a skip signal to the DCS; if the peak value of the spot scan is higher than the original absorption peak, or an abnormal peak appears, the resin scrubbing monitor outputs an alarm signal, records the abnormal information, makes a manual on-site judgment, and checks the condensate polishing process. The verification constant is calculated by the following formula: Among them, △Z is the turbidity change value per unit time, and △t is the unit time.

10. The method for determining the air scrubbing endpoint in the regeneration process of the fine treatment resin according to claim 9, characterized in that: The pollutant monitoring includes: When the scrubbing count n of the monomer reaction tower is ≥ 4 and the verification constant C is still greater than 1, an alarm signal is output and manual judgment is made on site; When C is less than the limit value and the scrubbing end point E is judged correctly, the water sample enters the sample pool of the UV spectrophotometer, and after the absorption light spot scan of the main pollutants, it is compared with the original absorption peak of the pollutants on the failed resin. If the peak values ​​of the spot scan are all lower than the original absorption peak, the scrubbing is completed, and the resin scrubbing monitor sends a skip signal to the DCS; if the peak value of the spot scan is higher than the original absorption peak, or an abnormal peak appears, the resin scrubbing monitor outputs an alarm signal, records the abnormal information, makes a manual on-site judgment, and checks the condensate polishing process.

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