Water level monitoring system

Abstract

The utility model discloses a water level monitoring system which is used for an industrial boiler and comprises a steam drum, at least two kinds of liquid level monitoring equipment and a control system, and the at least two kinds of liquid level monitoring equipment are installed in the steam drum and used for monitoring liquid level information of the steam drum; the at least two liquid level monitoring devices are electrically connected with the control system, and the control system is configured to check liquid level information, obtain the water level of the steam drum, control the steam drum to fill water when the water level is smaller than a water level preset value, and control the steam drum to drain water when the water level is larger than the water level preset value. According to the water level monitoring system, the at least two liquid level monitoring devices are arranged to monitor the water level of the steam drum, so that the water level data are provided, the more accurate and detailed water level data are obtained through mutual verification of the at least two liquid level monitoring devices, misjudgment of the water level caused by false water levels is effectively avoided, and the water level monitoring accuracy is improved. And potential safety hazards caused by false water levels are reduced.

Description

Technical Field

[0001] This application relates to the field of industrial boiler technology, and more specifically, to a water level monitoring system. Background Technology

[0002] In industrial boiler systems, both excessively low and excessively high water levels in the steam drum pose significant safety hazards. Therefore, it is essential to constantly monitor and adjust the steam drum water level. However, during operation, a sudden drop in boiler load can cause a decrease in the pressure of the steam-water mixture within the steam drum, leading to a decrease in the boiling point of water and a sudden increase in steam content and air bubbles. In this situation, the displayed water level may appear higher than the actual value. If the water level in the steam drum is not accurately determined, and water supply is reduced based solely on the false reading, it could result in excessively high pipe wall temperatures or even pipe rupture. Utility Model Content

[0003] This application provides a water level monitoring system to solve at least one of the aforementioned technical problems.

[0004] The water level monitoring system of this application, used in an industrial boiler, includes:

[0005] Steam drum;

[0006] At least two liquid level monitoring devices are installed inside the steam drum to monitor the liquid level information of the steam drum;

[0007] The control system is electrically connected to the at least two liquid level monitoring devices. The control system is configured to verify the liquid level information and obtain the water level of the steam drum, control the steam drum to fill with water when the water level is less than a preset water level value, and control the steam drum to drain water when the water level is greater than the preset water level value.

[0008] The water level monitoring system proposed in this application monitors the water level in the steam drum by setting up at least two types of liquid level monitoring devices, thereby providing water level data. By cross-verifying the water level data between the at least two types of liquid level monitoring devices, more accurate and detailed water level data can be obtained, effectively avoiding incorrect judgments of water level caused by false water levels and reducing the safety hazards caused by false water levels.

[0009] In some embodiments, the at least two liquid level monitoring devices are uniformly arranged inside the steam drum along the length of the liquid surface.

[0010] Therefore, the even distribution of liquid level monitoring equipment helps to make the measured water level more accurate.

[0011] In some embodiments, the at least two level monitoring devices include dual-color local water level gauges.

[0012] Thus, the display method of the dual-color local water level gauge is more intuitive, which helps operators to quickly and accurately judge the liquid level.

[0013] In some embodiments, the number of the two-color local water level gauges is two, and the two two-color local water level gauges are respectively installed at both ends of the steam drum along the length of the liquid surface.

[0014] In this way, the two dual-color local water level gauges can cross-check each other when measuring water level. Setting them on both sides helps to make the data more accurate. In addition, dual-color local water level gauges are low in cost, and setting up multiple dual-color local water level gauges helps to save costs.

[0015] In some embodiments, the at least two level monitoring devices include dual-chamber balance containers.

[0016] Therefore, using a dual-chamber balancing container helps reduce measurement errors and improve measurement accuracy.

[0017] In some embodiments, the at least two level monitoring devices include capacitive level gauges.

[0018] Thus, the high sensitivity, fast response speed, and strong anti-interference ability of capacitive level gauges are conducive to rapid response, providing real-time level information, and improving the reliability of level information.

[0019] In some embodiments, the at least two liquid level monitoring devices include a dual-color local water level gauge, a dual-chamber balance vessel, and a capacitive liquid level gauge, wherein the dual-color local water level gauge, the dual-chamber balance vessel, and the capacitive liquid level gauge are spaced apart within the steam drum along the length of the liquid surface.

[0020] Therefore, setting up three different liquid level monitoring devices with different operating principles at the same time helps to reduce the error caused by a single device being affected by a certain factor.

[0021] In some embodiments, there are two bicolor local water level gauges, which are respectively disposed at both ends of the steam drum along the length of the liquid surface. The dual-chamber balance vessel and the capacitive level gauge are disposed at intervals between the two bicolor local water level gauges along the length of the liquid surface.

[0022] This helps improve the accuracy of liquid level data and facilitates the observation and comparison of liquid level information from different liquid level monitoring devices.

[0023] In some embodiments, the water level monitoring system further includes a steam pipe and a water supply pipe. A first monitoring device is installed on the steam pipe, and a second monitoring device is installed on the water supply pipe. The first and second monitoring devices are used to monitor the pressure difference between the bottom and top of the water in the steam drum. The first and second monitoring devices are electrically connected to the control system, and the control system can calculate the water level of the steam drum based on the pressure difference.

[0024] Thus, measuring the water level in the steam drum by the pressure difference between the bottom and top usually has high measurement accuracy, which is beneficial for obtaining more accurate liquid level information.

[0025] In some embodiments, the first monitoring device is a steam flow meter, and the second monitoring device is a water supply flow meter.

[0026] In this way, while measuring the pressure difference between the bottom and top of the water in the steam drum, the steam flow rate and feedwater flow rate can also be obtained.

[0027] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0029] Figure 1 This is a schematic diagram of the structure of the water level monitoring system according to an embodiment of this application;

[0030] Figure 2 This is an assembly diagram of the liquid level monitoring equipment of the water level monitoring system according to an embodiment of this application.

[0031] Explanation of key component symbols: Water level monitoring system 100, steam drum 10, liquid level monitoring equipment 20, dual-color local water level gauge 21, dual-chamber balance vessel 22, capacitive liquid level gauge 23, control system 30, steam pipe 40, water supply pipe 50, first monitoring equipment 60, second monitoring equipment 70. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] This disclosure provides many different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0036] In industrial boiler systems, both excessively low and excessively high water levels in the steam drum pose significant safety hazards. Therefore, it is essential to constantly monitor and adjust the steam drum water level. However, during operation, a sudden drop in boiler load can cause a decrease in the pressure of the steam-water mixture within the steam drum, leading to a decrease in the boiling point of water and a sudden increase in steam content and air bubbles. In this situation, the displayed water level may appear higher than the actual value. If the water level in the steam drum is not accurately determined, and water supply is reduced based solely on the false reading, it could result in excessively high pipe wall temperatures or even pipe rupture.

[0037] Please see Figure 1 The water level monitoring system 100 of this application embodiment is used in an industrial boiler, including a steam drum 10, at least two types of liquid level monitoring devices 20 and a control system. The at least two types of liquid level monitoring devices 20 are installed in the steam drum 10 to monitor the liquid level information of the steam drum 10. The at least two types of liquid level monitoring devices 20 are electrically connected to the control system 30. The control system 30 is configured to verify the liquid level information and obtain the water level of the steam drum 10. When the water level is less than a preset water level value, the control system 30 controls the steam drum 10 to fill with water. When the water level is greater than the preset water level value, the control system 30 controls the steam drum 10 to drain water.

[0038] The water level monitoring system 100 proposed in this application monitors the water level of the steam drum 10 by setting at least two types of liquid level monitoring devices 20, thereby providing water level data. By cross-verifying the water level data by at least two types of liquid level monitoring devices 20, more accurate and detailed water level data can be obtained, effectively avoiding incorrect judgment of water level caused by false water levels and reducing the safety hazards caused by false water levels.

[0039] Specifically, the steam drum 10, also known as the boiler drum, is the most important pressure-bearing component in a natural circulation boiler, mainly used in medium-pressure, high-pressure, and subcritical boilers for power generation. It is a cylindrical pressure vessel in industrial boilers used for steam-water separation and steam purification, forming a water circulation loop and storing boiler water. In industrial boiler systems, the detection and control of the steam drum 10 water level is crucial for the normal operation of the boiler and a primary condition for the boiler's three-impulse control. If the steam drum 10 water level is too high, liquid carryover in the steam will occur, reducing steam output and quality, causing superheater scaling, or damaging turbine blades. If the steam drum 10 water level is too low, it can affect the steam-water balance, cause the boiler to burn out, and in severe cases, lead to a boiler explosion. Therefore, accurate monitoring of the steam drum 10 water level is essential for safe operation.

[0040] In the embodiments of this application, among at least two types of liquid level monitoring devices 20, the different types of liquid level monitoring devices 20 measure liquid levels on different principles. Furthermore, one or more of the same type of liquid level monitoring devices 20 can be set.

[0041] In this embodiment, the control component is a DCS control system. A DCS control system, or Distributed Control System, is a new type of computer control system widely used in industrial production, manufacturing, and processing. The DCS control system evolved from centralized control systems, integrating computer, communication, display, and control technologies (4C technologies) to form a multi-level computer system consisting of a process control level and a process monitoring level, linked by a communication network. This system features distributed control, centralized operation, hierarchical management, flexible configuration, and convenient configuration.

[0042] In this embodiment, at least two types of liquid level monitoring devices 20 acquire liquid level information, which includes measured water levels. The measured water levels acquired by multiple liquid level monitoring devices 20 are compared with each other, and the measured water levels with excessive deviations are excluded. The average value of the remaining measured water levels is taken as the water level of the steam drum 10. Any difference between any set of measured water levels and the remaining measured water levels exceeding 20 mm is considered an excessive deviation.

[0043] In this embodiment, the control component is used to control the water level inside the steam drum 10. In other embodiments, the water level inside the steam drum 10 can also be controlled manually.

[0044] In some embodiments, at least two types of liquid level monitoring devices 20 are uniformly arranged inside the steam drum 10 along the length of the liquid surface.

[0045] Thus, the even distribution of the 20 liquid level monitoring devices helps to make the measured water level more accurate.

[0046] Specifically, at least two types of liquid level monitoring devices 20 are evenly installed along the length of the liquid surface inside the steam drum 10 to ensure accurate monitoring of the liquid level inside the steam drum 10, thereby improving the safety and stability of boiler operation.

[0047] In this embodiment, at least two types of liquid level monitoring devices 20 with different operating principles are uniformly arranged inside the steam drum 10 along the length of the liquid surface. This ensures that the measuring points of the multiple liquid level monitoring devices 20 are uniform, guaranteeing the comprehensiveness and accuracy of the measurements. Furthermore, this ensures that if one device malfunctions, the other device can still operate normally and provide accurate liquid level information.

[0048] It is important to note that, to improve measurement reliability, each level monitoring device 20 should be redundantly configured. This ensures that if one level monitoring device 20 fails, the other can still function normally and provide accurate level information. The level monitoring devices 20 require regular maintenance and calibration to ensure the accuracy and reliability of their measurement results. During maintenance, special attention should be paid to checking the integrity and reliability of components such as sampling tubes, transmitters, and connecting cables.

[0049] Please see Figure 1 and Figure 2 In some embodiments, at least two liquid level monitoring devices 20 include a dual-color local water level gauge 21.

[0050] Thus, the display method of the dual-color local water level gauge 21 is more intuitive, which helps operators to quickly and accurately judge the liquid level.

[0051] Specifically, the bicolor local water level gauge 21 is an instrument used to monitor changes in water level. It is typically installed on the boiler drum 10 or other pressure vessels to visually display the water level. The bicolor local water level gauge 21 is widely used in industrial and commercial applications such as boilers, water tanks, and storage tanks to monitor, control, and prevent overflows.

[0052] The dual-color display technology allows the liquid level to be displayed intuitively in red and green, facilitating observation and comparison. The dual-color local water level gauge 21 is less affected by factors such as water quality and temperature, exhibiting high reliability. The dual-color local water level gauge 21 can promptly display the liquid level, enabling operators to quickly detect abnormalities and take appropriate measures, thereby preventing accidents such as overflows. The dual-color local water level gauge 21 has a simple structure, is easy to install and maintain, and requires no complex calibration or adjustment.

[0053] It is important to note that when introducing hot water or steam into the dual-color local water level gauge 21, the water valve and steam valve should be opened slowly to avoid sudden opening that could cause the safety ball to activate or a rapid change in the internal pressure of the gauge. During use, carefully observe the display window of the water level gauge to ensure the water level gradually rises and stabilizes at a certain position. If the water level window becomes dark or even completely black, it may be due to a large amount of rust or other impurities in the water; in this case, timely drainage and cleaning are necessary. During flushing or maintenance operations, avoid simultaneously closing the water valve and steam valve to prevent cold air from entering the water level gauge, causing rapid cooling and damage. When flushing the water level gauge under operating pressure, the water valve should not be opened too wide. If the water valve is opened too wide, the rapid expansion of steam and water could potentially cause the water level gauge to explode.

[0054] In some embodiments, there are two bicolor local water level gauges 21, which are respectively installed at both ends of the steam drum 10 along the length of the liquid surface.

[0055] In this way, the two dual-color local water level gauges 21 can cross-check each other when measuring water level. Setting them on both sides helps to make the data more accurate. In addition, the dual-color local water level gauges 21 have a low cost, and setting multiple dual-color local water level gauges 21 helps to save costs.

[0056] Specifically, when there are two dual-color local water level gauges 21, and these two dual-color local water level gauges 21 are respectively installed at both ends along the length of the liquid surface inside the steam drum 10, it can provide more comprehensive and accurate water level monitoring for the steam drum 10.

[0057] In this embodiment, the dual-color local water level gauge 21 should be connected to the inside of the steam drum 10 via a connecting pipe to ensure accurate reflection of the water level within the steam drum 10. The connecting pipe should have a certain slope to ensure smooth liquid flow and avoid blockages and errors.

[0058] It is important to note that the installation location should avoid interference factors within the steam drum 10, such as the steam-water separator and downcomer, to minimize the impact on water level measurement. If abnormal data or trends are detected, they should be investigated and addressed promptly to ensure the safe operation of the boiler.

[0059] Please see Figure 1 and Figure 2 In some embodiments, at least two level monitoring devices 20 include a dual-chamber balance container 22.

[0060] Thus, using the dual-chamber balance container 22 helps to reduce measurement errors and improve measurement accuracy.

[0061] Specifically, the dual-chamber balance vessel 22 is a device that uses the principle of a dual-chamber balance vessel 22 to measure the liquid level in a boiler. The working principle of the dual-chamber balance vessel 22 is based on the principle of communicating vessels and the principle of hydrostatic pressure balance. When the water level in the boiler drum 10 changes, the water level in the dual-chamber balance vessel 22 will also change accordingly due to the interconnected pipes. By measuring the changes in the liquid levels in the upper and lower chambers of the dual-chamber balance vessel 22, the changes in the water level in the boiler drum 10 can be reflected.

[0062] In detail, when the water level in the steam drum 10 rises, the liquid level in the upper chamber also rises, while the liquid level in the lower chamber drops to maintain pressure balance between the liquid columns in the two chambers. This liquid level change is converted into a differential pressure signal, which is amplified and converted by a differential pressure transmitter, and finally output as a standard electrical or digital signal for displaying and recording the boiler's water level.

[0063] Compared to other types of level gauges, the dual-chamber balance vessel 22 uses the principle of liquid level difference for measurement, offering higher accuracy and reliability. Due to its unique structure, the dual-chamber balance vessel 22 possesses a certain degree of self-compensation capability, reducing the impact of medium density changes on the measurement results. This level gauge is suitable for measuring the water level of boiler drums 10 under various pressure and temperature conditions. The dual-chamber balance vessel 22 has a relatively simple structure and is easy to maintain.

[0064] It is important to note that the level gauge of the dual-chamber balance vessel 22 requires regular inspection and maintenance during use to ensure its normal operation. Furthermore, changes in ambient temperature may affect the measurement results of the dual-chamber balance vessel 22, necessitating appropriate compensation or adjustment measures. Additionally, when selecting the dual-chamber balance vessel 22, the corrosiveness of the medium must be considered, and suitable materials and models should be chosen.

[0065] In some embodiments, at least two level monitoring devices 20 include a capacitive level gauge 23.

[0066] Thus, the capacitive level gauge 23 has high sensitivity, fast response speed, and strong anti-interference ability, which is conducive to rapid response, providing real-time level information, and improving the reliability of level information.

[0067] Specifically, the capacitive level gauge 23 is an instrument for measuring liquid level based on the principle of capacitance. In detail, the capacitive level gauge 23 uses the change in the dielectric between the two plates of a capacitor to measure the liquid level. When the level gauge is installed in a container, one plate is usually fixed to the container wall as a reference electrode; while the other plate moves with the change in liquid level, serving as a sensing electrode. When the liquid level rises, liquid enters between the two plates of the capacitor as a dielectric, causing the capacitance to increase. Conversely, when the liquid level falls, liquid flows out of the capacitor, and the capacitance decreases accordingly. By measuring this change in capacitance, the liquid level can be accurately reflected.

[0068] Compared to other types of level gauges, the capacitive level gauge 23 offers higher measurement accuracy, with measurement errors typically within a few millimeters, meeting the requirements of applications demanding high level accuracy. Furthermore, the capacitive level gauge 23 maintains measurement accuracy and reliability during long-term operation, is less affected by environmental temperature and medium changes, and is less susceptible to external interference. In addition, the capacitive level gauge 23 is adaptable to various liquid media, including corrosive liquids and high-temperature liquids. Different electrode materials can be selected according to actual needs to meet the requirements of different liquid characteristics.

[0069] It is important to note that capacitive level gauges are susceptible to external interference during use, such as electromagnetic fields and vibrations. Therefore, it is best to avoid installing capacitive level gauges in locations with strong electromagnetic fields or vibrations. If interference cannot be avoided, measures such as using shielded cables and adding grounding can be taken to reduce its impact.

[0070] When using a capacitive level gauge 23 for measurement, it is necessary to ensure that the relative permittivity of the measured medium does not change during the measurement process. The permittivity of the measured medium will affect the capacitance value of the capacitor, thus affecting the accuracy of the measurement results.

[0071] Please see Figure 1 and Figure 2 In some embodiments, at least two types of liquid level monitoring devices 20 include a dual-color local water level gauge 21, a dual-chamber balance vessel 22, and a capacitive liquid level gauge 23, which are spaced apart in the steam drum 10 along the length of the liquid surface.

[0072] Thus, setting up three different liquid level monitoring devices 20 at the same time helps to reduce the error caused by a single device being affected by a certain factor.

[0073] Specifically, in this embodiment, a dual-color local water level gauge 21, a dual-chamber balancing container 22, and a capacitive level gauge 23 are simultaneously provided. Furthermore, one or more of each of these components can be used. Optionally, the intervals between two adjacent level monitoring devices 20 are substantially the same.

[0074] In some embodiments, there are two bicolor local water level gauges 21, which are respectively arranged at both ends of the steam drum 10 along the length of the liquid surface. The dual-chamber balance container 22 and the capacitive level gauge 23 are arranged at intervals between the two bicolor local water level gauges 21 along the length of the liquid surface.

[0075] This helps improve the accuracy of liquid level data, and at the same time, it facilitates the observation and comparison of liquid level information from different liquid level monitoring devices 20.

[0076] Specifically, in this embodiment, four liquid level monitoring devices 20 are installed inside the steam drum 10, including two bicolor local water level gauges 21, a dual-chamber balance vessel 22, and a capacitive liquid level gauge 23. Furthermore, the four liquid level monitoring devices 20 are arranged in a straight line, with the two bicolor local water level gauges 21 located at both ends, and the dual-chamber balance vessel 22 and the capacitive liquid level gauge 23 located between the two bicolor local water level gauges 21, with adjacent liquid level monitoring devices 20 spaced equidistantly. This layout comprehensively considers the needs of direct observation, measurement accuracy, adaptability, and automated monitoring. This arrangement not only improves the accuracy and reliability of water level monitoring in the steam drum 10 but also enhances the safety and efficiency of boiler operation. Simultaneously, it provides operators with multiple means to observe and judge the boiler water level status, facilitating timely implementation of necessary operational measures to ensure the safe operation of the boiler.

[0077] It should be noted that the two-color local water level gauges 21 at both ends should be set slightly away from the side wall of the steam drum 10 to avoid the side wall of the steam drum 10 affecting the temperature and water level near the side wall of the steam drum 10, which would result in a large error in the measurement value of the two-color local water level gauges 21.

[0078] In this embodiment, the preset water level value is the optimal water level range for the operation of the steam drum 10.

[0079] Please see Figure 1In some embodiments, the water level monitoring system 100 further includes a steam pipe 40 and a water supply pipe 50. A first monitoring device 60 is installed on the steam pipe 40, and a second monitoring device 70 is installed on the water supply pipe 50. The first monitoring device 60 and the second monitoring device 70 are used to monitor the pressure difference between the bottom and top of the water in the steam drum 10. The first monitoring device 60 and the second monitoring device 70 are electrically connected to the control system 30, and the control system 30 can calculate the water level of the steam drum 10 based on the pressure difference.

[0080] Thus, measuring the water level of the steam drum 10 by the pressure difference between the bottom and the top usually has high measurement accuracy, which is beneficial for obtaining more accurate liquid level information.

[0081] Specifically, in this embodiment, the steam pipe 40 is connected to the top of the steam drum 10 and is responsible for transmitting the steam generated inside the steam drum 10 to various steam consumption points. The water supply pipe 50 is connected to the bottom of the steam drum 10 and is used to continuously replenish water into the steam drum 10 to maintain the water level inside the steam drum 10 within a certain range.

[0082] The first monitoring device 60 and the second monitoring device 70 can respectively measure the pressure at the bottom and top of the water in the steam drum 10, and thereby measure the pressure difference between the bottom and top of the water in the steam drum 10. Based on this pressure difference, the water level in the steam drum 10 is calculated using the following formula:

[0083]

[0084] Where H is the water level, ΔP is the pressure difference between the bottom and top of the water in the steam drum 10, ρ is the density of water, and g is the acceleration due to gravity.

[0085] In this embodiment of the application, the control component can calculate the water level of the steam drum 10 based on the pressure difference, and compare the water level with a preset water level. When the water level is less than the preset water level value, the control component controls the steam drum 10 to fill with water, and when the water level is greater than the preset water level value, the control component controls the steam drum 10 to drain water.

[0086] In some embodiments, the first monitoring device 60 is a steam flow meter, and the second monitoring device 70 is a water supply flow meter.

[0087] In this way, while measuring the pressure difference between the bottom and top of the water in the steam drum 10, the steam flow rate and feedwater flow rate can also be obtained.

[0088] Specifically, in this embodiment, both the steam flow meter and the feedwater flow meter have pressure sensors. The two pressure sensors are used to monitor the pressure at the bottom and top of the water in the steam drum 10, respectively, and transmit the data to the control system 30 to calculate the water level in the steam drum 10.

[0089] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0090] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the stated features. In the description of this application, "multiple" means at least two, such as two or three, unless otherwise explicitly specified.

[0091] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A water level monitoring system for industrial boilers, characterized in that, include: Steam drum; At least two liquid level monitoring devices are installed inside the steam drum to monitor the liquid level information of the steam drum; The control system is electrically connected to the at least two liquid level monitoring devices. The control system is configured to verify the liquid level information and obtain the water level of the steam drum, control the steam drum to fill with water when the water level is less than a preset water level value, and control the steam drum to drain water when the water level is greater than the preset water level value.

2. The water level monitoring system according to claim 1, characterized in that, The at least two liquid level monitoring devices are evenly arranged inside the steam drum along the length of the liquid surface.

3. The water level monitoring system according to claim 1, characterized in that, The at least two liquid level monitoring devices include a dual-color local water level gauge.

4. The water level monitoring system according to claim 3, characterized in that, The number of the two-color local water level gauges is two, and the two two-color local water level gauges are respectively installed at both ends of the steam drum along the length of the liquid surface.

5. The water level monitoring system according to claim 1, characterized in that, The at least two liquid level monitoring devices include dual-chamber balance containers.

6. The water level monitoring system according to claim 1, characterized in that, The at least two liquid level monitoring devices include capacitive liquid level gauges.

7. The water level monitoring system according to claim 1, characterized in that, The at least two types of liquid level monitoring devices include a dual-color local water level gauge, a dual-chamber balance vessel, and a capacitive liquid level gauge, wherein the dual-color local water level gauge, the dual-chamber balance vessel, and the capacitive liquid level gauge are spaced apart within the steam drum along the length of the liquid surface.

8. The water level monitoring system according to claim 7, characterized in that, The number of the two-color local water level gauges is two, and the two-color local water level gauges are respectively installed at both ends of the steam drum along the length of the liquid surface. The dual-chamber balance vessel and the capacitive liquid level gauge are spaced apart between the two-color local water level gauges along the length of the liquid surface.

9. The water level monitoring system according to claim 1, characterized in that, The water level monitoring system also includes a steam pipe and a water supply pipe. A first monitoring device is installed on the steam pipe, and a second monitoring device is installed on the water supply pipe. The first and second monitoring devices are used to monitor the pressure difference between the bottom and top of the water in the steam drum. The first and second monitoring devices are electrically connected to the control system, and the control system can calculate the water level of the steam drum based on the pressure difference.

10. The water level monitoring system according to claim 9, characterized in that, The first monitoring device is a steam flow meter, and the second monitoring device is a water supply flow meter.

Images