Air cooling island anti-corrosion system and method capable of automatically dispensing and adding chemicals based on spectrum method

Abstract

The invention provides an air cooling island anti-corrosion system and an air cooling island anti-corrosion method capable of automatically dispensing and adding chemicals based on spectrometry, and relates to the technical field of anti-corrosion in the electric power industry, the system comprises a hydrogen peroxide stock solution box and a hydrogen peroxide solution box, and a liquid outlet of the hydrogen peroxide stock solution box is connected with a liquid inlet of the hydrogen peroxide solution box; a concentration detection outlet of the hydrogen peroxide solution tank is connected with an inlet of a high-concentration hydrogen peroxide solution spectrum detector, and an outlet of the high-concentration hydrogen peroxide solution spectrum detector is connected with another water inlet of the hydrogen peroxide solution tank; water at an outlet of the hydrogen peroxide solution tank is connected with an inlet of a main steam exhaust pipe, and an outlet of the main steam exhaust pipe is sequentially connected with an air cooling island and a low-concentration hydrogen peroxide solution spectrum detector. By automatically adjusting the frequency of the dosing pump, the dosing amount is accurately controlled, the problem of dosing lag is solved, and the continuity and effectiveness of corrosion prevention of the air cooling island are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of anti-corrosion in the electric power industry, and in particular to an air-cooling island anti-corrosion system and method for automatic drug dispensing and dosing based on spectroscopy. Background Art

[0002] The carbon steel components in the huge air-cooling system of the direct air-cooled unit are prone to corrosion. The corrosion products are a long-term source of pollution to the water vapor quality. On the one hand, they will increase the burden on the condensate treatment system and pollute the ion exchange resin. On the other hand, they will cause corrosion and thinning of the heat dissipation pipe inlet, the inner wall of the exhaust pipe and the exhaust pipe guide vane of the air-cooled island, affecting the safe operation of the unit.

[0003] One of the current measures to solve the corrosion of air-cooled islands is to add a certain concentration of hydrogen peroxide solution to the air-cooled island. Adding hydrogen peroxide solution to the air-cooled island is divided into two steps. The first step is to accurately prepare the commercially available hydrogen peroxide solution to the required dosing concentration of hydrogen peroxide, and the second step is to accurately add the prepared hydrogen peroxide solution to the air-cooled island.

[0004] On the one hand, the membrane electrode method is used to test the concentration of hydrogen peroxide solution during the accurate preparation of hydrogen peroxide solution. However, the membrane electrode method requires the addition of an electrolyte containing chloride ions, and it is inevitable that the membrane will rupture. If not discovered in time, the electrolyte containing chloride ions will enter the hydrogen peroxide solution tank. Adding hydrogen peroxide solution with chloride ions to the air-cooling island will cause serious corrosion of the air-cooling island. This method poses a risk of threatening the safe operation of the unit. On the other hand, the concentration of hydrogen peroxide solution added to the air-cooling island is 0.1 mg / L. After hydrogen peroxide decomposes in the air-cooling island, the concentration of hydrogen peroxide in the condensate is lower than 0.1 mg / L, and the detection limit of the membrane electrode method cannot be reached. Therefore, it is impossible to accurately test the low concentration of hydrogen peroxide in the condensate. Currently, there is no online meter on the market that can accurately test the concentration of hydrogen peroxide lower than 0.1 mg / L. Summary of the invention

[0005] In order to solve the defects of the prior art, the present invention provides an air-cooled island anti-corrosion system and method for automatic drug dispensing and dosing based on spectroscopy. The present invention automatically adjusts the frequency of the dosing pump, accurately controls the dosing amount, solves the dosing lag problem, and ensures the continuity and effectiveness of the air-cooled island anti-corrosion.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides an air-cooled island anti-corrosion system for automatic drug dispensing and dosing based on spectroscopy, comprising a hydrogen peroxide stock solution tank, a hydrogen peroxide solution tank, a high-concentration hydrogen peroxide solution spectral detector, and a low-concentration hydrogen peroxide solution spectral detector;

[0008] The demineralized water is connected to the water inlet of the hydrogen peroxide solution tank, the liquid outlet of the hydrogen peroxide stock liquid tank is connected to the liquid inlet of the hydrogen peroxide solution tank, the concentration detection outlet of the hydrogen peroxide solution tank is connected to the inlet of the high-concentration hydrogen peroxide solution spectrum detector, and the outlet of the high-concentration hydrogen peroxide solution spectrum detector is connected to another water inlet of the hydrogen peroxide solution tank; the outlet water of the hydrogen peroxide solution tank is connected to the inlet of the main exhaust pipe, and the outlet of the main exhaust pipe is connected to the air cooling island and the low-concentration hydrogen peroxide solution spectrum detector in sequence.

[0009] As a further improvement of the present invention, the high-concentration hydrogen peroxide solution spectrum detector comprises a first high-purity water storage tank, a high-concentration hydrogen peroxide standard solution storage tank and a first optical path cuvette;

[0010] The water from the hydrogen peroxide solution tank is connected to the first inlet of the first four-way valve, the outlet of the first high-purity water storage tank is connected to the second inlet of the first four-way valve; the outlet of the high-concentration hydrogen peroxide standard solution storage tank is connected to the third inlet of the first four-way valve, the outlet of the first four-way valve is connected to the inlet of the first optical path cuvette, and the outlet of the first optical path cuvette is connected to another water inlet of the hydrogen peroxide solution tank.

[0011] As a further improvement of the present invention, the first optical path cuvette has a xenon lamp and an ultraviolet spectrometer; the xenon lamp is located on one side of the first optical path cuvette for emitting light source, and the ultraviolet spectrometer is located on the other side of the first optical path cuvette for receiving light signals.

[0012] As a further improvement of the present invention, the low-concentration hydrogen peroxide solution spectrum detector comprises a second pure water storage tank, a low-concentration hydrogen peroxide standard solution storage tank, a titanium reagent storage tank outlet, and a second optical path cuvette;

[0013] The condensate water is connected to the first inlet of the second four-way valve, the outlet of the second pure water storage tank is connected to the second inlet of the second four-way valve, the outlet of the low-concentration hydrogen peroxide standard solution storage tank is connected to the third inlet of the second four-way valve, the outlet of the second four-way valve is connected to the inlet of the pipeline mixer, the outlet of the titanium reagent storage tank is connected to the inlet of the pipeline mixer, and the outlet of the pipeline mixer is connected to the inlet of the second optical path cuvette.

[0014] As a further improvement of the present invention, an LDE lamp is installed on one side of the second optical path cuvette, and a full-band spectrometer is installed on the other side.

[0015] As a further improvement of the present invention, the liquid outlet of the hydrogen peroxide stock liquid tank is connected to the liquid inlet of the hydrogen peroxide solution tank through a first metering pump;

[0016] The outlet of the high-concentration hydrogen peroxide solution spectrum detector is connected to another water inlet of the hydrogen peroxide solution tank through a reflux pump;

[0017] The outlet water of the hydrogen peroxide solution tank is connected to the inlet of the main exhaust pipe through a dosing pump; a filter is also arranged between the outlet water of the hydrogen peroxide solution tank and the inlet of the main exhaust pipe;

[0018] The main exhaust pipe inlet is connected to the low-pressure cylinder outlet.

[0019] In a second aspect, the present invention provides an air-cooled island anti-corrosion method based on automatic drug dispensing and dosing by spectroscopy, based on the air-cooled island anti-corrosion system based on automatic drug dispensing and dosing by spectroscopy, the air-cooled island anti-corrosion method comprises:

[0020] The high concentration hydrogen peroxide solution spectrum detector detects the hydrogen peroxide concentration in the hydrogen peroxide solution tank, and the concentration is a specific set value;

[0021] A low concentration hydrogen peroxide solution spectrum detector is used to detect the concentration of hydrogen peroxide in condensed water.

[0022] As a further improvement of the present invention, the high-concentration hydrogen peroxide solution spectrum detector detects the concentration of hydrogen peroxide in a zeroing phase, a calibration phase and a detection phase;

[0023] Zeroing stage: high-purity water in the first high-purity water storage tank enters the first optical path cuvette and performs zeroing;

[0024] Calibration stage: high-purity water in the high-concentration hydrogen peroxide standard solution storage tank is passed into the first optical path cuvette to read the absorbance;

[0025] Detection stage: The hydrogen peroxide solution enters the first optical path cuvette, and the absorbance is compared with the absorbance of the target concentration hydrogen peroxide solution in the calibration process for automatic dispensing;

[0026] The automatic dispensing method prepares a hydrogen peroxide solution of a certain concentration through desalted water and the hydrogen peroxide solution in the hydrogen peroxide stock tank. The desalted water enters the hydrogen peroxide solution tank in a lateral flow along the wall of the water tank, so that the desalted water forms a vortex in the hydrogen peroxide solution tank.

[0027] As a further improvement of the present invention, the detection of hydrogen peroxide concentration by the low-concentration hydrogen peroxide solution spectrum detector is divided into a zeroing stage, a calibration stage and a detection stage;

[0028] During the zeroing stage, the high-purity water in the second high-purity water storage tank passes through the pipeline mixer and enters the second optical path cuvette. The full-band spectrometer receives the projected light signal and adjusts to zero;

[0029] During the calibration stage, two-point calibration is performed. In the calibration process of the first point, the high-purity water in the second high-purity water storage tank enters the pipeline mixer, the titanium reagent in the titanium reagent storage tank is added to the pipeline mixer, the high-purity water and the titanium reagent are mixed and colored in the pipeline mixer, and the colored solution enters the second optical path cuvette; the full-band spectrometer receives the projected light signal and reads the absorbance; in the calibration process of the second point, the low-concentration hydrogen peroxide standard solution in the low-concentration hydrogen peroxide standard solution storage tank enters the pipeline mixer, the titanium reagent in the titanium reagent storage tank is added to the pipeline mixer, the low-concentration hydrogen peroxide standard solution and the titanium reagent are mixed and colored in the pipeline mixer, and the colored solution enters the second optical path cuvette, the full-band spectrometer receives the projected light signal and reads the absorbance; a linear curve is made for the first calibration point and the second calibration point, and a working curve y=kx with absorbance as the horizontal coordinate and hydrogen peroxide concentration as the vertical coordinate is stored, and k is the linear slope of the first calibration point and the second calibration point;

[0030] During the detection stage, the flow rate of the condensate to be tested is controlled, the condensate to be tested enters the pipeline mixer, the titanium reagent in the titanium reagent storage tank is added to the pipeline mixer, the condensate to be tested and the titanium reagent are mixed and colored in the pipeline mixer, the colored solution enters the second optical path colorimetric cell, the absorbance is read, and the absorbance is substituted into the calibration curve to automatically calculate the hydrogen peroxide concentration in the condensate.

[0031] As a further improvement of the present invention, it also includes an automatic dosing step; the automatic dosing process is as follows:

[0032] Collect the condensate flow rate, the current hydrogen peroxide concentration in the hydrogen peroxide solution tank, the current condensate hydrogen peroxide concentration displayed by the low-concentration hydrogen peroxide solution spectrum detector, the dosing pump stroke and the set hydrogen peroxide concentration of the condensate, and automatically control the dosing pump frequency according to the dosing pump frequency = initial feedforward frequency × multi-factor coefficient + PID output frequency, and finally realize automatic control of dosing;

[0033] The initial feedforward frequency divides the condensate flow into several flow segments according to (0-100)%, collects the condensate flow through the PLC in the automatic dosing control cabinet, uses the judgment block in the PLC to judge the flow segment in which the condensate is currently located, and then gives the corresponding initial feedforward frequency;

[0034] The multi-factor coefficient, multi-factor coefficient = 1 × (M1 / M2) × (c1 / c2), where c1 is the initial setting value of the condensate hydrogen peroxide concentration, c2 is the current setting value of the condensate hydrogen peroxide, M1 is the initial stroke of the dosing pump, and M2 is the current stroke of the dosing pump;

[0035] The PID output frequency is obtained by PLC based on the current condensate hydrogen peroxide concentration and the PID output frequency is given by the PID control algorithm.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] The low-concentration online hydrogen peroxide detector and its supporting automatic dispensing and dosing system of the present invention are mainly realized based on spectral analysis and automatic control technology. High-concentration hydrogen peroxide solution spectrum detector: This device uses the absorbance or fluorescence characteristics of hydrogen peroxide at a specific wavelength to measure the concentration. The light emitted by the spectrometer is irradiated into the hydrogen peroxide solution, and the intensity change of the reflected or transmitted light is measured to infer the concentration of hydrogen peroxide. This method does not require the addition of any chemical reagents, avoids additional pollution and cost, and improves the accuracy and stability of the measurement. Low-concentration hydrogen peroxide solution spectrum detector: In low-concentration detection, in order to improve the accuracy, titanium reagent is added to the system. After the titanium reagent reacts with hydrogen peroxide, a specific spectral change will occur. By detecting this change, the concentration of hydrogen peroxide can be accurately determined. This method has higher sensitivity and accuracy in the low concentration range. The system automatically prepares the required concentration of hydrogen peroxide solution by controlling the ratio of the hydrogen peroxide stock tank and the desalted water. The design of the desalted water inlet realizes the self-stirring function, ensures that the solution is mixed evenly, and improves the accuracy of dispensing. The high-concentration hydrogen peroxide solution spectrum detector detects the concentration of the prepared hydrogen peroxide solution in real time, and automatically adjusts the water or liquid inlet ratio according to the preset value until the target concentration is reached. The low-concentration hydrogen peroxide solution spectrum detector monitors the hydrogen peroxide concentration in the condensate water of the air-cooling island in real time to ensure the anti-corrosion effect while avoiding excessive dosing.

[0038] Furthermore, the present invention allows the desalted water to enter the water tank in a lateral flow along the wall surface of the water tank, so that the desalted water forms a vortex in the hydrogen peroxide solution tank, which plays a self-stirring role without adding a stirring device.

[0039] Furthermore, the present invention uses a high-concentration hydrogen peroxide solution spectrometer that does not require any reagents, which can achieve automatic and accurate dosage of the hydrogen peroxide solution tank without human intervention and will not introduce impurity ions into the hydrogen peroxide solution tank.

[0040] Furthermore, the present invention can achieve a detection limit of less than 0.05 mg / L through a low-concentration hydrogen peroxide solution spectrometer, filling the gap in the accurate determination of low-concentration hydrogen peroxide solutions online in the market.

[0041] Furthermore, the stroke of the dosing pump of the present invention can automatically and accurately adjust the stroke of the dosing pump according to the control logic of initial feedforward frequency × multi-factor coefficient + PID output frequency, so as to accurately control the amount of hydrogen peroxide added and solve the problem of delayed dosing. The present invention adopts automatic control from drug dispensing to drug addition, is simple to operate, does not require human intervention, has a high degree of automation, and can achieve the anti-corrosion effect of air-cooled island. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a system schematic diagram of the present invention;

[0043] Figure 2 It is a schematic diagram of a high concentration hydrogen peroxide solution spectrum detector of the present invention;

[0044] Figure 3 It is a schematic diagram of a low-concentration hydrogen peroxide solution spectrum detector of the present invention. DETAILED DESCRIPTION

[0045] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations of the present invention. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way, and the execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0047] The purpose of the present invention is to develop an online hydrogen peroxide detector for detecting low concentrations, and to accurately control the dosage of the air cooling island through the low concentration online hydrogen peroxide detector.

[0048] The first object of the present invention is to provide an air-cooled island anti-corrosion system based on spectroscopy for automatic drug dispensing and dosing, comprising a hydrogen peroxide stock tank A, a hydrogen peroxide solution tank B, a high-concentration hydrogen peroxide solution spectrum detector C, and a low-concentration hydrogen peroxide solution spectrum detector D;

[0049] The demineralized water is connected to the water inlet of the hydrogen peroxide solution tank B, the liquid outlet of the hydrogen peroxide stock solution tank A is connected to the liquid inlet of the hydrogen peroxide solution tank B, the concentration detection outlet of the hydrogen peroxide solution tank B is connected to the inlet of the high-concentration hydrogen peroxide solution spectrum detector C, and the outlet of the high-concentration hydrogen peroxide solution spectrum detector C is connected to another water inlet of the hydrogen peroxide solution tank B; the outlet water of the hydrogen peroxide solution tank B is connected to the inlet of the main exhaust pipe 9, and the outlet of the main exhaust pipe 9 is connected to the air cooling island 10 and the low-concentration hydrogen peroxide solution spectrum detector D in sequence.

[0050] The present invention uses a spectral method to accurately detect hydrogen peroxide solutions of different concentrations. In the process of automatic dispensing, a specially designed desalted water inlet is used to realize a self-stirring function. At the same time, through optical principles, a high-concentration hydrogen peroxide solution spectrum detector without adding any reagents is used to accurately test the concentration of hydrogen peroxide, so as to realize automatic and accurate dispensing of hydrogen peroxide solution. In the process of automatic dosing, a titanium reagent capable of improving the accuracy is added, and a low-concentration hydrogen peroxide solution spectrum detector is used to accurately test the concentration of hydrogen peroxide in condensate water. Then, automatic and accurate dosing is realized by self-adjusting the dosing pump frequency, so as to solve the dosing lag problem and realize the anti-corrosion effect of the air-cooled island.

[0051] As an optional solution, the high concentration hydrogen peroxide solution spectrum detector C includes a first high-purity water storage tank C2, a high concentration hydrogen peroxide standard solution storage tank C3 and a first optical path cuvette C7;

[0052] The water from the hydrogen peroxide solution tank B is connected to the first inlet a of the first four-way valve C5, and the outlet of the first high-purity water storage tank C2 is connected to the second inlet b of the first four-way valve C5; the outlet of the high-concentration hydrogen peroxide standard solution storage tank C3 is connected to the third inlet c of the first four-way valve C5, and the outlet d of the first four-way valve C5 is connected to the inlet of the first optical path cuvette C7, and the outlet of the first optical path cuvette C7 is connected to another water inlet of the hydrogen peroxide solution tank B. The first optical path cuvette C7 has a xenon lamp C6 and an ultraviolet spectrometer C8; the xenon lamp C6 is located on one side of the first optical path cuvette C7 for emitting light, and the ultraviolet spectrometer C8 is located on the other side of the first optical path cuvette C7 for receiving light signals.

[0053] As an optional solution, the low-concentration hydrogen peroxide solution spectrum detector D includes a second pure water storage tank D6, a low-concentration hydrogen peroxide standard solution storage tank D7, a titanium reagent storage tank D8 outlet, and a second optical path cuvette D11;

[0054] The condensate water is connected to the first inlet a of the second four-way valve D2, the outlet of the second pure water storage tank D6 is connected to the second inlet b of the second four-way valve D2, the outlet of the low-concentration hydrogen peroxide standard solution storage tank D7 is connected to the third inlet c of the second four-way valve D2, the outlet d of the second four-way valve D2 is connected to the inlet of the pipeline mixer D9, the outlet of the titanium reagent storage tank D8 is connected to the inlet of the pipeline mixer D9, and the outlet of the pipeline mixer D9 is connected to the inlet of the second optical path cuvette D11. The second optical path cuvette D11 is equipped with an LDE lamp D11 on one side and a full-band spectrometer D12 on the other side.

[0055] The second object of the present invention is to provide an air-cooling island anti-corrosion method based on automatic drug dispensing and dosing by spectroscopy, based on the air-cooling island anti-corrosion system based on automatic drug dispensing and dosing by spectroscopy, the air-cooling island anti-corrosion method comprises:

[0056] The high concentration hydrogen peroxide solution spectrum detector C detects the hydrogen peroxide concentration in the hydrogen peroxide solution tank B, and the concentration is a specific set value;

[0057] Low concentration hydrogen peroxide solution spectrum detector D detects the concentration of hydrogen peroxide in condensed water.

[0058] In order to achieve the above object, the present invention provides the following technical solutions:

[0059] like Figures 1 to 3 As shown, the present invention provides an air-cooling island anti-corrosion system for automatic drug dispensing and dosing based on spectroscopy, comprising a hydrogen peroxide stock tank A, a hydrogen peroxide solution tank B, a high-concentration hydrogen peroxide solution spectrometer C, a low-concentration hydrogen peroxide solution spectrometer D, a first metering pump 1, a second metering pump 2, a first valve 3, a second valve 4, a reflux pump 5, a dosing pump 6, a filter 7, a low-pressure cylinder 8, a main exhaust pipe 9, an air-cooling island 10, a condensate pump 11, a high-concentration hydrogen peroxide solution spectrometer C, a first peristaltic pump C1, a first high-purity water storage tank C2, a high-concentration Hydrogen peroxide standard solution storage tank C3, second peristaltic pump C4, first four-way valve C5, xenon lamp C6, 10mm first optical path cuvette C7, ultraviolet spectrometer C8, low concentration hydrogen peroxide solution spectrum detector D, flow meter D1, second four-way valve D2, third peristaltic pump D3, fourth peristaltic pump D4, fifth peristaltic pump D5, second high-purity water storage tank D6, low concentration hydrogen peroxide standard solution storage tank D7, titanium reagent storage tank D8, pipeline mixer D9, LED lamp D10, 100mm second optical path cuvette D11, full-band spectrometer D12.

[0060] Combination Figure 1 The demineralized water is connected to the inlet of the second metering pump 2, the outlet of the second metering pump 2 is connected to the water inlet of the hydrogen peroxide solution tank B, the liquid outlet of the hydrogen peroxide stock solution tank A is connected to the inlet of the first metering pump 1, the outlet of the first metering pump 1 is connected to the liquid inlet of the hydrogen peroxide solution tank B, the concentration detection outlet of the hydrogen peroxide solution tank B is connected to the inlet of the first valve 3, the outlet of the first valve 3 is connected to the inlet of the high-concentration hydrogen peroxide solution spectrum detector C, the outlet of the high-concentration hydrogen peroxide solution spectrum detector C is connected to the inlet of the reflux pump 5, the outlet of the reflux pump 5 is connected to the inlet of the second valve 4, the second valve The outlet 4 is connected to another water inlet of the hydrogen peroxide solution tank B, the outlet water of the hydrogen peroxide solution tank B is connected to the inlet of the dosing pump 6, the outlet of the dosing pump 6 is connected to the inlet of the main exhaust pipe 9, the outlet of the low-pressure cylinder 8 is connected to the inlet of the main exhaust pipe 9, the outlet of the main exhaust pipe 9 is connected to the inlet of the air cooling island 10, the outlet of the air cooling island 10 is connected to the inlet of the condensate pump 11, the outlet sampling point of the condensate pump 11 is connected to the inlet of the low-concentration hydrogen peroxide solution spectrum detector D, and the condensate generated by the condensate pump 11 flows into the low-concentration hydrogen peroxide solution spectrum detector D through the sampling point for hydrogen peroxide concentration detection.

[0061] Combination Figure 2 The water from the hydrogen peroxide solution tank B is connected to the first inlet a of the first four-way valve C5, the outlet of the first high-purity water storage tank C2 is connected to the inlet of the first peristaltic pump C1, the outlet of the first peristaltic pump C1 is connected to the second inlet b of the first four-way valve C5, the outlet of the high-concentration hydrogen peroxide standard solution storage tank C3 is connected to the inlet of the second peristaltic pump C4, the outlet of the second peristaltic pump C4 is connected to the third inlet c of the first four-way valve C5, the outlet d of the first four-way valve C5 is connected to the inlet of the 10mm first optical path cuvette C7, the outlet of the 10mm first optical path cuvette C7 is connected to the inlet of the reflux pump 5, the xenon lamp C6 is located on one side of the 10mm first optical path cuvette C7, connected by optical fiber, the xenon lamp C6 is used to emit light source, the ultraviolet spectrometer C8 is located on the other side of the 10mm first optical path cuvette C7, connected by optical fiber, and the ultraviolet spectrometer C8 is used to receive optical signals.

[0062] Combination Figure 3 The condensate water is connected to the inlet of the flowmeter D1, the outlet of the flowmeter D1 is connected to the first inlet a of the second four-way valve D2, the outlet of the second pure water storage tank D6 is connected to the inlet of the third peristaltic pump D3, the outlet of the third peristaltic pump D3 is connected to the second inlet b of the second four-way valve D2, the outlet of the low-concentration hydrogen peroxide standard solution storage tank D7 is connected to the inlet of the fourth peristaltic pump D4, the outlet of the fourth peristaltic pump D4 is connected to the third inlet c of the second four-way valve D2, the outlet d of the second four-way valve D2 is connected to the inlet of the pipeline mixer D9, the outlet of the titanium reagent storage tank D8 is connected to the inlet of the pipeline mixer D9, the outlet of the pipeline mixer D9 is connected to the inlet of the 100mm second optical path cuvette D11, an LDE lamp D11 is installed on one side of the 100mm second optical path cuvette D11, and is connected through optical fiber, and a full-band spectrometer D12 is installed on the other side, and is connected through optical fiber.

[0063] When used specifically, the UV spectrometer C8 only receives absorbance in the UV band, and the xenon lamp is preheated for 5 minutes in advance.

[0064] The high concentration hydrogen peroxide solution spectrum detector C detects the hydrogen peroxide concentration in the hydrogen peroxide solution tank B, and the concentration is a specific set value.

[0065] like Figures 1 to 3 As shown, the high concentration hydrogen peroxide solution spectrum detector C detects the concentration of hydrogen peroxide in a zeroing phase, a calibration phase and a detection phase.

[0066] Zeroing stage: the a and c channels of the first four-way valve C5 are closed, the b channel and the d channel of the first four-way valve C5 are connected, the first peristaltic pump C1 is turned on, and the high-purity water in the first high-purity water storage tank C2 enters the 10mm first optical path cuvette C7 through the b channel and the d channel of the first four-way valve C5, the xenon lamp C6 generates light, and after the light passes through the 10mm first optical path cuvette C7, the ultraviolet spectrometer C8 reads the absorbance at a wavelength of 222nm and performs zeroing. After the zeroing is completed, the first peristaltic pump C1 is turned off, the drain channel valve is opened, and the remaining pure water in the 10mm first optical path cuvette C7 is drained;

[0067] Calibration stage: The target concentration of hydrogen peroxide standard solution is the concentration of hydrogen peroxide required for automatic dispensing. The second peristaltic pump C4 is turned on, and the a and b channels of the first four-way valve C5 are closed. The high-purity water in the high-concentration hydrogen peroxide standard solution storage tank C3 passes through the c and d channels of the first four-way valve C5 and enters the 10mm first optical path cuvette C7. The xenon lamp C6 generates light. After the light passes through the 10mm first optical path cuvette C7, the ultraviolet spectrometer C8 reads the absorbance at a wavelength of 222nm and stores it. After the calibration is completed, the drain channel valve is opened to drain the remaining hydrogen peroxide solution in the 10mm first optical path cuvette C7.

[0068] Detection stage: close the b and c channels of the first four-way valve C5, open and connect the a and d channels of the first four-way valve C5, the hydrogen peroxide solution enters from the a channel of the first four-way valve C5, flows out from the d channel, enters the 10 mm optical path cuvette, and the ultraviolet spectrometer C8 absorbs the absorbance at a wavelength of 222 nm. When the absorbance is compared with the absorbance of the target concentration hydrogen peroxide solution in the calibration process, automatic dispensing is performed.

[0069] The automatic dispensing is to prepare a certain concentration of hydrogen peroxide solution by using the desalted water and the hydrogen peroxide solution in the hydrogen peroxide stock solution tank A. The desalted water enters the hydrogen peroxide solution tank B by flowing sideways along the wall of the water tank, so that the desalted water forms a vortex in the hydrogen peroxide solution tank B, which plays a stirring role. The entire automatic dispensing setting is automatically completed in the PLC without human intervention. The specific automatic dispensing process is as follows:

[0070] When the liquid level of the hydrogen peroxide solution tank B reaches the low liquid level, automatic dispensing starts, the first metering pump 1 runs at a set flow rate for a set time and then stops, the second metering pump 2 is turned on and runs at a set flow rate, and at the same time, the first valve 3 and the second valve 4 are opened, the reflux pump 5 starts running, and the high-concentration hydrogen peroxide solution spectrometer C starts to detect the hydrogen peroxide concentration in the hydrogen peroxide solution tank B. When the detected hydrogen peroxide concentration is consistent with the absorbance of the target concentration, the second metering pump stops running.

[0071] The full-band spectrometer D12 only receives absorbance in the 170-780 nm band, and the LED lamp D10 is preheated for 5 minutes in advance.

[0072] The low concentration hydrogen peroxide solution spectrum detector D detects the concentration of hydrogen peroxide in condensed water.

[0073] like Figures 1 to 3 As shown, the low-concentration hydrogen peroxide solution spectrum detector D detects the concentration of hydrogen peroxide in a zeroing phase, a calibration phase and a detection phase.

[0074] During the zeroing stage, close the a channel and c channel of the second four-way valve D2, open the b channel and d channel, close the fourth peristaltic pump D4, close the fifth peristaltic pump D5, and open the third peristaltic pump D3. The third peristaltic pump D3 pumps the high-purity water in the second high-purity water storage tank D6 through the b and d channels of the second four-way valve D2, through the pipeline mixer D9, through the 100mm second optical path cuvette D11, the LED D10 emits light, the light passes through the 100mm second optical path cuvette D11, the full-band spectrometer receives the projected light signal, reads the absorbance at a wavelength of 420nm, and adjusts to zero.

[0075] During the calibration stage, two-point calibration is performed. During the calibration process of the first point, channel a and channel c of the second four-way valve D2 are closed, channel b and channel d are opened, the fourth peristaltic pump D4 is closed, the fifth peristaltic pump D5 is opened, and the third peristaltic pump D3 is opened. The third peristaltic pump D3 passes the high-purity water in the second high-purity water storage tank D6 through channels b and d of the second four-way valve D2 and enters the pipeline mixer D9. The fifth peristaltic pump D5 adds the titanium reagent in the titanium reagent storage tank D8 into the pipeline mixer D9. The high-purity water and the titanium reagent are mixed and colored in the pipeline mixer D9. The colored solution enters the 100mm second optical path cuvette D11. The LED lamp D10 emits light. The light passes through the 100mm second optical path cuvette D11. The full-band spectrometer receives the projected light signal and reads the absorbance at a wavelength of 420nm. The second point During the calibration process, close the a channel and b channel of the second four-way valve D2, open the c channel and d channel, open the fourth peristaltic pump D4, open the fifth peristaltic pump D5, and close the third peristaltic pump D3. The fourth peristaltic pump D4 passes the low-concentration hydrogen peroxide standard solution in the low-concentration hydrogen peroxide standard solution storage tank D7 through the c and d channels of the second four-way valve D2 and enters the pipeline mixer D9. The fifth peristaltic pump D5 adds the titanium reagent in the titanium reagent storage tank D8 into the pipeline mixer D9. The low-concentration hydrogen peroxide standard solution and the titanium reagent are mixed and colored in the pipeline mixer D9. The colored solution enters the 100 mm second optical path cuvette D11. The LED lamp D10 emits light. The light passes through the 100 mm second optical path cuvette D11. The full-band spectrometer receives the projected light signal and reads the absorbance at a wavelength of 420 nm. A linear curve is drawn for the first calibration point and the second calibration point, and a working curve y=kx with absorbance as the abscissa and hydrogen peroxide concentration as the ordinate is stored, where k is the linear slope of the first calibration point and the second calibration point.

[0076] During the detection stage, the b channel and c channel of the second four-way valve D2 are closed, the a channel and d channel are opened, the third peristaltic pump D3 is closed, the fourth peristaltic pump D4 is closed, and the fifth peristaltic pump D5 is opened. The flowmeter D1 controls the flow rate of the condensate water to be tested. The condensate water to be tested passes through the a and d channels of the second four-way valve D2 and enters the pipeline mixer D9. The fifth peristaltic pump D5 adds the titanium reagent in the titanium reagent storage tank D8 into the pipeline mixer D9. The condensate water to be tested and the titanium reagent are mixed and colored in the pipeline mixer D9. The colored solution enters the 100 mm second optical path cuvette D11, the LED lamp D10 emits light, and the light passes through the 100 mm second optical path cuvette D11. The full-band spectrometer receives the projected light signal, reads the absorbance at a wavelength of 420 nm, and substitutes the absorbance into the calibration curve to automatically calculate the hydrogen peroxide concentration in the condensate water.

[0077] The detection limit of the spectrometer D of the low-concentration hydrogen peroxide solution is 0.05 mg / L.

[0078] The automatic dosing is automatically adjusted by the metering pump frequency of the dosing pump 6, the low concentration hydrogen peroxide solution spectrum detector D and the condensate flow rate. The specific automatic dosing process is as follows:

[0079] The PLC automatically collects the condensate flow rate, the current hydrogen peroxide concentration of the hydrogen peroxide solution tank B, the current condensate hydrogen peroxide concentration displayed by the low-concentration hydrogen peroxide solution spectrum detector D, the stroke of the dosing pump 6 and the set hydrogen peroxide concentration of the condensate, and automatically controls the frequency of the dosing pump 6 according to the frequency of the dosing pump 6 = initial feedforward frequency × multi-factor coefficient + PID output frequency, thereby finally realizing automatic control of dosing.

[0080] The initial feedforward frequency divides the condensate flow into several flow segments according to 0-100%, collects the condensate flow through the PLC in the automatic dosing control cabinet, uses the judgment block in the PLC to judge the flow segment the current condensate is in, and then gives the corresponding initial feedforward frequency.

[0081] Table 1 Condensate flow segmentation and initial feedforward frequency relationship

[0082]

[0083]

[0084] The multi-factor coefficient, multi-factor coefficient = 1×(M1 / M2)×(c1 / c2), where c1 is the initial setting value of the condensate hydrogen peroxide concentration, mg / L, c2 is the current setting value of the condensate hydrogen peroxide, mg / L, M1 is the initial stroke of the dosing pump 6, and M2 is the current stroke of the dosing pump 6, in %.

[0085] The PID output frequency is given by the PID control algorithm according to the current condensate hydrogen peroxide concentration collected by PLC. Among them, P is the proportional gain, the value is 1.3, the unit is none; I is the integral time, the value is 60, the unit is second; D is the differential time, the value is 3, the unit is second.

[0086] In summary, the present invention has the following advantages:

[0087] The spectral method for detecting hydrogen peroxide concentration has high precision and stability, and can accurately control the dispensing and dosing process to ensure the anti-corrosion effect of the air-cooling island.

[0088] No reagents need to be added during high-concentration detection, thus avoiding the pollution and costs that may be caused by chemical reagents.

[0089] The entire system realizes automatic dispensing, automatic detection and automatic dosing, reducing manual intervention and improving work efficiency and reliability.

[0090] Through real-time monitoring and automatic adjustment, the system can respond quickly to changes in concentration, ensuring the antiseptic effect while avoiding excessive dosing.

[0091] In summary, the air-cooled island anti-corrosion system with automatic drug dispensing and dosing based on spectroscopy provided by the present invention has significant advantages in improving anti-corrosion effects, reducing operating costs, and reducing manual intervention, and is an important technological innovation in the field of modern industry.

[0092] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An air-cooling island anti-corrosion system based on spectroscopy for automatic drug dispensing and dosing, characterized in that: It includes a hydrogen peroxide stock solution tank (A), a hydrogen peroxide solution tank (B), a high-concentration hydrogen peroxide solution spectrum detector (C), and a low-concentration hydrogen peroxide solution spectrum detector (D); The demineralized water is connected to the water inlet of the hydrogen peroxide solution tank (B), the liquid outlet of the hydrogen peroxide stock solution tank (A) is connected to the liquid inlet of the hydrogen peroxide solution tank (B), the concentration detection outlet of the hydrogen peroxide solution tank (B) is connected to the inlet of the high-concentration hydrogen peroxide solution spectrum detector (C), and the outlet of the high-concentration hydrogen peroxide solution spectrum detector (C) is connected to another water inlet of the hydrogen peroxide solution tank (B); the outlet water of the hydrogen peroxide solution tank (B) is connected to the inlet of the main exhaust pipe (9), and the outlet of the main exhaust pipe (9) is connected to the air cooling island (10) and the low-concentration hydrogen peroxide solution spectrum detector (D) in sequence.

2. The air-cooling island anti-corrosion system based on spectroscopy for automatic drug dispensing and dosing according to claim 1 is characterized in that: The high-concentration hydrogen peroxide solution spectrometer (C) comprises a first high-purity water storage tank (C2), a high-concentration hydrogen peroxide standard solution storage tank (C3) and a first optical path cuvette (C7); The water from the hydrogen peroxide solution tank (B) is connected to the first inlet of the first four-way valve (C5), and the outlet of the first high-purity water storage tank (C2) is connected to the second inlet of the first four-way valve (C5); the outlet of the high-concentration hydrogen peroxide standard solution storage tank (C3) is connected to the third inlet of the first four-way valve (C5), and the outlet of the first four-way valve (C5) is connected to the inlet of the first optical path cuvette (C7), and the outlet of the first optical path cuvette (C7) is connected to another water inlet of the hydrogen peroxide solution tank (B).

3. The air-cooling island anti-corrosion system based on spectroscopy for automatic drug dispensing and dosing according to claim 2 is characterized in that: The first optical path cuvette (C7) comprises a xenon lamp (C6) and an ultraviolet spectrometer (C8); the xenon lamp (C6) is located on one side of the first optical path cuvette (C7) and is used to emit a light source, and the ultraviolet spectrometer (C8) is located on the other side of the first optical path cuvette (C7) and is used to receive an optical signal.

4. The air-cooling island anti-corrosion system based on spectroscopy for automatic drug dispensing and dosing according to claim 1 is characterized in that: The low-concentration hydrogen peroxide solution spectrometer (D) comprises a second pure water storage tank (D6), a low-concentration hydrogen peroxide standard solution storage tank (D7), an outlet of a titanium reagent storage tank (D8), and a second optical path cuvette (D11); The condensate water is connected to the first inlet of the second four-way valve (D2), the outlet of the second pure water storage tank (D6) is connected to the second inlet of the second four-way valve (D2), the outlet of the low-concentration hydrogen peroxide standard solution storage tank (D7) is connected to the third inlet of the second four-way valve (D2), the outlet of the second four-way valve (D2) is connected to the inlet of the pipeline mixer (D9), the outlet of the titanium reagent storage tank (D8) is connected to the inlet of the pipeline mixer (D9), and the outlet of the pipeline mixer (D9) is connected to the inlet of the second optical path cuvette (D11).

5. The air-cooling island anti-corrosion system based on spectroscopy for automatic drug dispensing and dosing according to claim 4 is characterized in that: An LDE lamp (D11) is installed on one side of the second optical path cuvette (D11), and a full-band spectrometer (D12) is installed on the other side.

6. The air-cooling island anti-corrosion system based on spectroscopy for automatic drug dispensing and dosing according to claim 1 is characterized in that: The liquid outlet of the hydrogen peroxide stock liquid tank (A) is connected to the liquid inlet of the hydrogen peroxide solution tank (B) via a first metering pump (1); The outlet of the high concentration hydrogen peroxide solution spectrum detector (C) is connected to another water inlet of the hydrogen peroxide solution tank (B) through a reflux pump (5); The outlet water of the hydrogen peroxide solution tank (B) is connected to the inlet of the main exhaust pipe (9) through a dosing pump (6); a filter (7) is also provided between the outlet water of the hydrogen peroxide solution tank (B) and the inlet of the main exhaust pipe (9); The inlet of the main exhaust pipe (9) is connected to the outlet of the low-pressure cylinder (8).

7. An air-cooling island anti-corrosion method based on automatic drug dispensing and dosing by spectroscopy, characterized in that: Based on the air-cooling island anti-corrosion system for automatic drug dispensing and dosing based on spectroscopy according to any one of claims 1 to 6, the air-cooling island anti-corrosion method comprises: The high concentration hydrogen peroxide solution spectrum detector (C) detects the hydrogen peroxide concentration in the hydrogen peroxide solution tank (B), and the concentration is a specific set value; A low concentration hydrogen peroxide solution spectrum detector (D) detects the concentration of hydrogen peroxide in condensed water.

8. The air-cooling island anti-corrosion method based on spectroscopy automatic drug dispensing and dosing according to claim 7 is characterized in that: The high concentration hydrogen peroxide solution spectrum detector (C) detects the hydrogen peroxide concentration in a zeroing phase, a calibration phase and a detection phase; Zeroing stage: high-purity water in the first high-purity water storage tank (C2) enters the first optical path cuvette (C7) and performs zeroing; Calibration stage: high-purity water in the high-concentration hydrogen peroxide standard solution storage tank (C3) is passed into the first optical path cuvette (C7) and the absorbance is read; Detection stage: the hydrogen peroxide solution enters the first optical path cuvette (C7), and when the absorbance is compared with the absorbance of the target concentration hydrogen peroxide solution in the calibration process, automatic dispensing is performed; The automatic dispensing system prepares a hydrogen peroxide solution of a certain concentration by using desalted water and the hydrogen peroxide solution in the hydrogen peroxide stock solution tank (A). The desalted water enters the hydrogen peroxide solution tank (B) in a lateral flow along the wall of the water tank, so that the desalted water forms a vortex in the hydrogen peroxide solution tank (B).

9. The air-cooling island anti-corrosion method based on spectroscopy automatic drug dispensing and dosing according to claim 7 is characterized in that: The low-concentration hydrogen peroxide solution spectrum detector (D) detects the hydrogen peroxide concentration in a zeroing phase, a calibration phase and a detection phase; During the zeroing stage, the high-purity water in the second high-purity water storage tank (D6) passes through the pipeline mixer (D9) and enters the second optical path cuvette (D11), and the full-band spectrometer receives the projected light signal and adjusts to zero; During the calibration stage, two-point calibration is performed. In the calibration process of the first point, the high-purity water in the second high-purity water storage tank (D6) enters the pipeline mixer (D9), the titanium reagent in the titanium reagent storage tank (D8) is added to the pipeline mixer (D9), the high-purity water and the titanium reagent are mixed and colored in the pipeline mixer (D9), and the colored solution enters the second optical path cuvette (D11); the full-band spectrometer receives the projected light signal and reads the absorbance; In the second point calibration process, the low-concentration hydrogen peroxide standard solution in the low-concentration hydrogen peroxide standard solution storage tank (D7) enters the pipeline mixer (D9), the titanium reagent in the titanium reagent storage tank (D8) is added to the pipeline mixer (D9), the low-concentration hydrogen peroxide standard solution and the titanium reagent are mixed and colored in the pipeline mixer (D9), the colored solution enters the second optical path cuvette (D11), the full-band spectrometer receives the projected light signal, and reads the absorbance; a linear curve is drawn for the first calibration point and the second calibration point, and a working curve y=kx with absorbance as the horizontal coordinate and hydrogen peroxide concentration as the vertical coordinate is stored, and k is the linear slope of the first calibration point and the second calibration point; During the detection stage, the flow rate of the condensate to be tested is controlled, the condensate to be tested enters the pipeline mixer (D9), the titanium reagent in the titanium reagent storage tank (D8) is added to the pipeline mixer (D9), the condensate to be tested and the titanium reagent are mixed and colored in the pipeline mixer (D9), the colored solution enters the second optical path cuvette (D11), the absorbance is read, and the absorbance is substituted into the calibration curve to automatically calculate the hydrogen peroxide concentration in the condensate.

10. The air-cooling island anti-corrosion method based on spectroscopy automatic drug dispensing and dosing according to claim 8, characterized in that: It also includes an automatic dosing step; the automatic dosing process is as follows: Collect the condensate flow rate, the current hydrogen peroxide concentration of the hydrogen peroxide solution tank (B), the current condensate hydrogen peroxide concentration displayed by the low-concentration hydrogen peroxide solution spectrum detector (D), the dosing pump (6) stroke and the set hydrogen peroxide concentration of the condensate, and automatically control the frequency of the dosing pump (6) according to the dosing pump (6) frequency = initial feedforward frequency × multi-factor coefficient + PID output frequency, so as to finally realize automatic control of dosing; The initial feedforward frequency divides the condensate flow into several flow segments according to (0-100)%, collects the condensate flow through the PLC in the automatic dosing control cabinet, uses the judgment block in the PLC to judge the flow segment in which the condensate is currently located, and then gives the corresponding initial feedforward frequency; The multi-factor coefficient is: multi-factor coefficient = 1×(M1 / M2)×(c1 / c2), wherein c1 is the initial setting value of the condensate hydrogen peroxide concentration, c2 is the current setting value of the condensate hydrogen peroxide, M1 is the initial stroke of the dosing pump (6), and M2 is the current stroke of the dosing pump (6); The PID output frequency is obtained by PLC based on the current condensate hydrogen peroxide concentration and the PID output frequency is given by the PID control algorithm.

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