Water vapor sampling comprehensive analysis system and method

Abstract

The invention provides a water vapor sampling comprehensive analysis system and method, and the system is characterized in that the system comprises a high temperature sampling module which is used for collecting a water vapor sample, and carrying out the cooling and depressurization operation of the water vapor sample to obtain first sample water; the constant temperature module is used for keeping the first sample water at a preset temperature; the low-temperature sampling module is used for collecting quantitative first sample water as second sample water; the chemical instrument module is used for performing component analysis on the second sample water to obtain a water quality index of the second sample water; the pipeline corrosion monitoring module is used for monitoring the corrosion degree of the pipeline in real time to obtain corrosion data; the control module is used for controlling the high-temperature sampling module, the constant-temperature module and the pipeline corrosion monitoring module to work; and the data processing module is used for carrying out corrosivity analysis according to the water quality indexes and the corrosion data. According to the technical scheme provided by the invention, the corrosion condition of the pipeline can be obtained by analyzing the water quality index and the corrosion data, and the monitoring accuracy is improved.

Description

Technical Field

[0001] This document relates to the technical field of water vapor sampling, and in particular to a water vapor sampling comprehensive analysis system and analysis method. Background Art

[0002] At present, there is a common phenomenon of "two highs" in my country's water vapor monitoring, that is, the qualified rate of water vapor monitoring is very high, but the corrosion rate of thermal equipment in the water vapor system is also very high. The water vapor sampling device usually consists of three parts: a high-temperature sampling rack, a constant temperature device and a low-temperature sampling rack. Through the water vapor sampling device, the temperature, pressure and other parameters of the water sample entering the online chemical instrument are regulated, and the impurities in the sampling system are discharged to ensure that the water sample entering the instrument meets the measurement requirements. However, the existing water vapor sampling device has the following problems:

[0003] During the operation of the unit, corrosion products are produced all the time. Since the sampling tube of the sampling system has a small diameter, a low flow rate, and there is a gas-liquid two-phase flow in some sections, the corrosion products are easily retained in the sampling tube, which ultimately affects the accuracy of chemical monitoring measurements. Therefore, the operating unit needs to be drained regularly. However, due to the unstable performance of the drain valve, it often leaks internally after draining, causing the operating personnel to be afraid and unwilling to drain the sewage. In addition, the internal leakage of the drain valve will cause impurities and components such as oxygen and carbon dioxide in the air to enter the sampling system, resulting in deviations in the online chemical instrument measurement.

[0004] The water vapor sampling system has many types of components and the water vapor parameters vary greatly. Traditional control and monitoring methods cannot effectively realize equipment fault warning, fault diagnosis, and life prediction functions. It is difficult to realize digital monitoring and intelligent regulation of key parameters of water samples. It is completely impossible to realize energy consumption monitoring, energy consumption optimization, and control optimization. It no longer meets the requirements for safe, stable, green and low-carbon operation of power plants. Summary of the invention

[0005] The present invention provides a water vapor sampling comprehensive analysis system and analysis method, aiming to solve the above-mentioned problems.

[0006] The present invention provides a water vapor sampling comprehensive analysis system, comprising:

[0007] A high-temperature sampling module is used to collect high-temperature and high-pressure water vapor samples, and to cool and depressurize the water vapor samples according to a preset temperature and a preset pressure to obtain a first sample of water;

[0008] A constant temperature module, connected to the high temperature sampling module, and used to keep the first sample of water at a preset temperature;

[0009] A low temperature sampling module is used to collect a quantitative first sample of water as a second sample of water;

[0010] A chemical instrument module, used for analyzing the components of the second water sample, obtaining water quality indicators of the second water sample, and sending the water quality indicators to a data processing module;

[0011] Pipeline corrosion monitoring module, used to monitor pipeline corrosion in real time and obtain corrosion data;

[0012] A control module, connected to the high temperature sampling module, the constant temperature module and the pipeline corrosion monitoring module, and controlling the high temperature sampling module, the constant temperature module and the pipeline corrosion monitoring module to work;

[0013] The data processing module is used to perform corrosion analysis based on the water quality index obtained by the chemical instrument module and the corrosion data obtained by the pipeline corrosion monitoring module.

[0014] The present invention provides a water vapor sampling comprehensive analysis method, comprising:

[0015] Collect high-temperature and high-pressure water vapor samples through a high-temperature sampling module, and cool and depressurize the water vapor samples to obtain a first sample of water;

[0016] The first water is maintained at a preset temperature by a constant temperature module;

[0017] Collect a quantitative amount of the first sample of water through a low-temperature sampling module as the second sample of water;

[0018] Performing component analysis on the second water sample by a chemical instrument module, and sending the obtained analysis results to a data processing module;

[0019] The pipeline corrosion monitoring module is used to monitor the pipeline corrosion degree in real time and obtain corrosion data;

[0020] A data processing module performs a corrosion analysis based on the analysis results obtained by the chemical instrument module and the corrosion data obtained by the pipeline corrosion monitoring module.

[0021] The embodiment of the present invention has the following beneficial effects: by chemically analyzing, measuring and monitoring water vapor samples, changes in water vapor quality can be discovered in time to ensure that the water vapor quality of the thermal system meets relevant standards and requirements. Through the water vapor sampling and analysis system, problems that may cause equipment corrosion and scaling can be discovered and dealt with in time, thereby extending the service life of the equipment. By optimizing water vapor quality management, downtime and economic losses caused by equipment failure and maintenance can be reduced, and the economic benefits of the power plant can be improved. The data and analysis results provided by the water vapor sampling and analysis system can provide strong support for the decision-making of the power plant, such as formulating more reasonable operation strategies, optimizing dosing plans, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate one or more embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 is a schematic diagram of a water vapor sampling and comprehensive analysis system according to an embodiment of the present invention;

[0024] Figure 2 The present invention is a flowchart of a method for comprehensive analysis of water vapor sampling according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the following will be combined with the drawings in one or more embodiments of this specification to clearly and completely describe the technical solutions in one or more embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this document.

[0026] System Example

[0027] According to an embodiment of the present invention, a water vapor sampling and comprehensive analysis system is provided. Figure 1 is a schematic diagram of a water vapor sampling and comprehensive analysis system according to an embodiment of the present invention. Figure 1 As shown, the water vapor sampling and comprehensive analysis system of the embodiment of the present invention specifically includes:

[0028] A high-temperature sampling module is used to collect high-temperature and high-pressure water vapor samples, and to cool and depressurize the water vapor samples according to a preset temperature and a preset pressure to obtain a first sample of water;

[0029] A constant temperature module, connected to the high temperature sampling module, and used to keep the first sample of water at a preset temperature;

[0030] A low temperature sampling module is used to collect a quantitative first sample of water as a second sample of water;

[0031] A chemical instrument module, used for analyzing the components of the second water sample, obtaining water quality indicators of the second water sample, and sending the water quality indicators to a data processing module;

[0032] Pipeline corrosion monitoring module, used to monitor pipeline corrosion in real time and obtain corrosion data;

[0033] A control module, connected to the high temperature sampling module, the constant temperature module and the pipeline corrosion monitoring module, and controlling the high temperature sampling module, the constant temperature module and the pipeline corrosion monitoring module to work;

[0034] The data processing module is used to perform corrosion analysis based on the water quality index obtained by the chemical instrument module and the corrosion data obtained by the pipeline corrosion monitoring module.

[0035] The high temperature sampling module specifically includes:

[0036] High-pressure valve, which is connected to the sampling pipeline through threads or flanges;

[0037] The cooler is connected to the sampling pipeline through the inlet and outlet pipes to form a closed cooling system. The water vapor sample undergoes heat exchange in the cooler through the serpentine sampling coil, so that the water vapor sample reaches a preset temperature;

[0038] Pressure reducing regulating valve, installed after the cooler, controls the pressure of the water vapor sample by adjusting the opening of the valve core;

[0039] The high temperature filter, installed after the pressure reducing regulating valve, is used to remove impurities from the water vapor sample to prevent clogging and damage to subsequent equipment.

[0040] The constant temperature module specifically includes:

[0041] A thermostatic device, wherein the thermostatic structure comprises a plurality of thermostatic coolers, and a flow regulating valve is provided on the plurality of thermostatic coolers, and the thermostatic structure is used to control the temperature of the second sample water within a preset temperature range;

[0042] A temperature sensor is arranged in the constant temperature device to monitor the temperature of the water vapor sample in real time;

[0043] Temperature controller: Based on the feedback signal from the temperature sensor, it issues instructions to adjust the working state of the heating / cooling element to keep the sample temperature within the set constant range.

[0044] Heat Exchanger: In some designs, a heat exchanger may be used to achieve heat exchange between the constant temperature circulating water and the sample water, thereby controlling the sample water temperature.

[0045] Pipeline pump: used to drive constant temperature circulating water to flow in the pipeline, forming a closed loop to ensure a constant temperature effect.

[0046] The pipeline corrosion monitoring module specifically includes:

[0047] Electrochemical workstation, used to provide stable potential control and current measurement functions;

[0048] Reference electrode, used to provide a stable reference potential;

[0049] Auxiliary electrode, used to transmit current;

[0050] The working electrode is placed inside the power plant pipeline to generate corrosion current;

[0051] The electrochemical workstation is connected to the reference electrode, the auxiliary electrode and the working electrode through wires.

[0052] The pipeline corrosion monitoring module is further provided with a temperature compensation module to ensure the accuracy of the measurement results.

[0053] The pipeline corrosion monitoring module further comprises:

[0054] Corrosion early warning module: When the corrosion monitoring system detects corrosion anomalies, it automatically triggers the early warning mechanism, sends early warning information to relevant personnel, and initiates the corresponding emergency response process.

[0055] The control module is specifically used for:

[0056] Controlling the preset temperature and preset pressure of the high temperature sampling module;

[0057] Controlling the constant temperature module to maintain a preset temperature;

[0058] Used to control the opening and closing of the corrosion early warning module;

[0059] Control the water output of the high temperature sampling module.

[0060] The data processing module is specifically used for:

[0061] The outliers and noises of the water quality index and the corrosion data are removed, the water quality index and the corrosion data are standardized, and the pipeline corrosion results are obtained.

[0062] The high temperature sampling module further comprises:

[0063] Overpressure protection valve: The overpressure protection valve is connected in parallel to the sampling pipeline and opens automatically when the system pressure exceeds the set value;

[0064] The cooling water cut-off protection module is connected to the cooling water system of the cooler and monitors the flow of cooling water through sensors.

[0065] The high temperature sampling module in the water vapor sampling device is an important part of the sampling system. It is specially designed to safely and stably extract water vapor samples from a high temperature and high pressure steam and water environment. In a specific implementation of the embodiment of the present invention, the high temperature sampling rack generally includes the following components, each of which has its own unique connection structure and function:

[0066] High-pressure valve, the high-pressure valve is directly installed on the sampling pipeline, and is closely connected to the sampling pipeline through threads or flanges to ensure sealing. As a primary control valve for water vapor sampling, the high-pressure valve is responsible for controlling the flow of the sample to ensure the accuracy and safety of the sampling process. At the same time, its material (such as 1Crl8Ni9Ti) must be able to withstand high temperature and high pressure environments to prevent leakage and damage.

[0067] The cooler is connected to the sampling pipeline through the inlet and outlet pipes to form a closed cooling system. The sample water is heat exchanged in the cooler through the serpentine sampling coil and other structures to achieve the purpose of cooling. The main function of the cooler is to preliminarily cool the high-temperature water vapor sample and reduce its temperature to a range that the subsequent processing device can withstand. This not only protects the subsequent equipment from high temperature damage, but also improves the safety and efficiency of sampling.

[0068] The pressure reducing regulating valve is usually installed after the cooler, and controls the pressure of the sample water by adjusting the opening of the valve core. The pressure reducing regulating valve is used to reduce the pressure of the high-temperature and high-pressure sample water to a pressure range suitable for subsequent analysis or processing (such as 0.4MPa), while meeting the specified sample water flow requirements. This helps to ensure the stable operation of the sampling system and the accuracy of sampling.

[0069] Overpressure protection valve, the overpressure protection valve is connected in parallel to the sampling pipeline and automatically opens when the system pressure exceeds the set value. The overpressure protection valve is used to prevent the sampling system from damaging the instrument or equipment due to excessive water sample pressure. When the system pressure exceeds the set value, the overpressure protection valve will quickly open and release the excess pressure to ensure the safe operation of the system.

[0070] Cooling water cut-off protection system, which is usually connected to the cooling water system of the cooler, monitors the flow of cooling water through sensors. The cooling water cut-off protection system is used to cut off the flow of sample water when the cooling water is cut off to prevent the sample water temperature from being too high and damaging the equipment and instruments. It ensures the automatic protection and recovery ability of the sampling system when the water cooling is insufficient.

[0071] The over-temperature water cut-off protection system is connected to the sample water temperature sensor and triggers the protection action when the sample water temperature exceeds the set value. The over-temperature water cut-off protection system is used to cut off the sample water flow when the sample water temperature exceeds the safe range to prevent the high-temperature sample water from damaging the equipment and instruments. It and the cooling water cut-off protection system together constitute a dual protection mechanism for the sampling system.

[0072] In a specific implementation of an embodiment of the present invention, the monitoring steps of the pipeline corrosion monitoring module specifically include:

[0073] Surface treatment: Remove dirt, paint, rust and other impurities from the pipe surface to expose the metal matrix. For coated pipes, holes can be punched in the coating or local coating can be scraped off to expose the metal.

[0074] Install electrodes: Install the reference electrode, auxiliary electrode and working electrode on the pipeline according to the electrochemical measurement requirements, and ensure good contact between the electrodes.

[0075] Connect equipment: Connect each electrode to the electrochemical workstation and set appropriate measurement parameters, such as polarization potential range, scan rate, etc.

[0076] Apply polarization potential: Apply a small polarization potential to the working electrode through the electrochemical workstation and monitor the changes in corrosion current.

[0077] Data recording and analysis: Record the current-potential curve during the polarization process and calculate the corrosion rate based on the linear polarization theory. Usually, the corrosion rate K (unit: mm / y) can be calculated by the following formula:

[0078] K= B×I corr

[0079] d×F×ρ

[0080] Where B is a constant related to materials and environment, Icorr is the corrosion current density (unit: A / cm 2 ), d is the density of the material (unit: g / cm 3 ), F is the Faraday constant (about 96485C / mol), and ρ is the electrochemical equivalent of the material (unit: g / mol).

[0081] Evaluate the corrosion condition of the pipeline based on the calculation results and determine whether repair or replacement measures are needed.

[0082] The following beneficial effects are achieved by adopting the embodiments of the present invention:

[0083] By combining water quality analysis with corrosion analysis of water vapor samples, and then conducting chemical analysis, measurement and monitoring, changes in water vapor quality can be discovered in a timely manner to ensure that the water vapor quality of the thermal system meets relevant standards and requirements. Through the water vapor sampling and analysis system, problems that may cause equipment corrosion and scaling can be discovered and dealt with in a timely manner, thereby extending the service life of the equipment. By optimizing water vapor quality management, downtime and economic losses caused by equipment failure and maintenance can be reduced, and the economic benefits of the power plant can be improved. The data and analysis results provided by the water vapor sampling and analysis system can provide strong support for the decision-making of the power plant, such as formulating more reasonable operation strategies and optimizing dosing plans.

[0084] Method Embodiment

[0085] According to an embodiment of the present invention, a water vapor sampling comprehensive analysis method is provided. Figure 2 Schematic diagram of the water vapor sampling comprehensive analysis method according to an embodiment of the present invention. Figure 2As shown, the water vapor sampling comprehensive analysis method of the embodiment of the present invention specifically includes:

[0086] S1. Collect high-temperature and high-pressure water vapor samples through a high-temperature sampling module, and cool and depressurize the water vapor samples to obtain the first water sample;

[0087] S2, maintaining the first water at a preset temperature through a constant temperature module;

[0088] S3, collecting a quantitative amount of the first sample of water through a low-temperature sampling module as the second sample of water;

[0089] S4, performing component analysis on the second water sample by a chemical instrument module, and sending the obtained analysis results to a data processing module;

[0090] S5. Monitor the pipeline corrosion degree in real time through the pipeline corrosion monitoring module to obtain corrosion data;

[0091] S6. Performing a corrosion analysis through a data processing module based on the analysis results obtained by the chemical instrument module and the corrosion data obtained by the pipeline corrosion monitoring module.

[0092] The embodiments of the present method correspond one-to-one to the above-mentioned system embodiments. Please refer to the contents of the system embodiments for details, which will not be repeated here.

[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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water vapor sampling and comprehensive analysis system, characterized in that include: A high-temperature sampling module is used to collect high-temperature and high-pressure water vapor samples, and to cool and depressurize the water vapor samples according to a preset temperature and a preset pressure to obtain a first sample of water; A constant temperature module, connected to the high temperature sampling module, and used to keep the first sample of water at a preset temperature; A low temperature sampling module is used to collect a quantitative first sample of water as a second sample of water; A chemical instrument module, used for analyzing the components of the second water sample, obtaining water quality indicators of the second water sample, and sending the water quality indicators to a data processing module; Pipeline corrosion monitoring module, used to monitor pipeline corrosion in real time and obtain corrosion data; A control module, connected to the high temperature sampling module, the constant temperature module and the pipeline corrosion monitoring module, and controlling the high temperature sampling module, the constant temperature module and the pipeline corrosion monitoring module to work; The data processing module is used to perform corrosion analysis based on the water quality index obtained by the chemical instrument module and the corrosion data obtained by the pipeline corrosion monitoring module.

2. The system according to claim 1, characterized in that The high temperature sampling module specifically includes: High-pressure valve, which is connected to the sampling pipeline through threads or flanges; The cooler is connected to the sampling pipeline through the inlet and outlet pipes to form a closed cooling system. The water vapor sample undergoes heat exchange in the cooler through the serpentine sampling coil, so that the water vapor sample reaches a preset temperature; Pressure reducing regulating valve, installed after the cooler, controls the pressure of the water vapor sample by adjusting the opening of the valve core; The high temperature filter, installed after the pressure reducing regulating valve, is used to remove impurities from the water vapor sample to prevent clogging and damage to subsequent equipment.

3. The system according to claim 1, characterized in that The constant temperature module specifically includes: A thermostatic device, wherein the thermostatic structure comprises a plurality of thermostatic coolers, and a flow regulating valve is provided on the plurality of thermostatic coolers, and the thermostatic structure is used to control the temperature of the second sample water within a preset temperature range; A temperature sensor is arranged in the constant temperature device to monitor the temperature of the water vapor sample in real time; Temperature controller: Based on the feedback signal from the temperature sensor, it issues instructions to adjust the working state of the heating / cooling element to keep the sample temperature within the set constant range. Heat Exchanger: In some designs, a heat exchanger may be used to achieve heat exchange between the constant temperature circulating water and the sample water, thereby controlling the sample water temperature. Pipeline pump: used to drive constant temperature circulating water to flow in the pipeline, forming a closed loop to ensure a constant temperature effect.

4. The system according to claim 1, characterized in that The pipeline corrosion monitoring module specifically includes: Electrochemical workstation, used to provide stable potential control and current measurement functions; Reference electrode, used to provide a stable reference potential; Auxiliary electrode, used to transmit current; The working electrode is placed inside the power plant pipeline to generate corrosion current; The electrochemical workstation is connected to the reference electrode, the auxiliary electrode and the working electrode through wires.

5. The system according to claim 1, characterized in that The pipeline corrosion monitoring module is further provided with a temperature compensation module to ensure the accuracy of the measurement results.

6. The system according to claim 1, characterized in that The pipeline corrosion monitoring module further comprises: Corrosion early warning module: When the corrosion monitoring system detects corrosion anomalies, it automatically triggers the early warning mechanism, sends early warning information to relevant personnel, and initiates the corresponding emergency response process.

7. The system according to claim 1, characterized in that The control module is specifically used for: Controlling the preset temperature and preset pressure of the high temperature sampling module; Controlling the constant temperature module to maintain a preset temperature; Used to control the opening and closing of the corrosion early warning module; Control the water output of the high temperature sampling module.

8. The system according to claim 1, characterized in that The data processing module is specifically used for: The outliers and noises of the water quality index and the corrosion data are removed, the water quality index and the corrosion data are standardized, and the pipeline corrosion results are obtained.

9. The system according to claim 1, characterized in that The high temperature sampling module further comprises: Overpressure protection valve: The overpressure protection valve is connected in parallel to the sampling pipeline and opens automatically when the system pressure exceeds the set value; The cooling water cut-off protection module is connected to the cooling water system of the cooler and monitors the flow of cooling water through sensors.

10. A water vapor sampling and comprehensive analysis method, characterized in that: include: Collect high-temperature and high-pressure water vapor samples through a high-temperature sampling module, and cool and depressurize the water vapor samples to obtain a first sample of water; The first water is maintained at a preset temperature by a constant temperature module; Collect a quantitative amount of the first sample of water through a low-temperature sampling module as the second sample of water; Performing component analysis on the second water sample by a chemical instrument module, and sending the obtained analysis results to a data processing module; The pipeline corrosion monitoring module is used to monitor the pipeline corrosion degree in real time and obtain corrosion data; A data processing module performs a corrosion analysis based on the analysis results obtained by the chemical instrument module and the corrosion data obtained by the pipeline corrosion monitoring module.

Images