Steam quality monitoring method and system

Abstract

The invention is suitable for the technical field of steam energy, and provides a steam quality monitoring method and system, and the method comprises the steps: obtaining steam data which comprises the temperature and pressure of steam; a steam enthalpy value is calculated according to the steam data, the steam enthalpy value is used for calculating steam quality to obtain a steam enthalpy value, and the steam enthalpy value is compared with a steam enthalpy value table to obtain first steam quality; the water quantity and the steam quantity of the condensed steam judged to be unqualified steam are obtained, second steam quality is obtained through calculation of the water quantity and the steam quantity, the first steam quality is compared with the second steam quality, and if the difference value of the first steam quality and the second steam quality does not exceed a threshold value, it is judged that the difference value is within a reasonable range; and if the difference value of the two exceeds a threshold value, judging that a fault occurs, sending fault information to the terminal, and receiving terminal confirmation information, thereby solving the problem that the subsequent processing is not targeted enough due to the limitation of a single detection method that whether the error or the fault occurs cannot be accurately detected.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam energy, and in particular relates to a steam quality monitoring method and system. Background Art

[0002] In the chemical production process, the heat energy generated by chemical reactions is usually recovered by waste heat boilers, and the heat energy generated by chemical reactions is fully utilized through the steam generated. For example, the carbon monoxide shift reaction and the ammonia synthesis reaction will generate a large amount of heat energy. The temperature of the material coming out of the catalytic reactor is about 430℃. The high-temperature material enters the heat exchange tube of the waste heat boiler, and it exchanges heat with the water in the waste heat boiler, generating a large amount of high-temperature water vapor, which is then sent out of the waste heat boiler for utilization.

[0003] At present, when the first test results show that the steam quality is unqualified, immediate measures are often required to deal with it. However, due to the limitations of a single detection method, it may not be possible to accurately determine whether it is a detection error or a malfunction, resulting in subsequent processing being less targeted and even affecting production efficiency and equipment safety. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a steam quality monitoring method and system, aiming to solve the problem raised in the third part of the background technology.

[0005] The embodiment of the present invention is implemented as follows: a steam quality monitoring method, the method comprising: Acquiring steam data, wherein the steam data includes temperature and pressure of the steam; Calculating a steam enthalpy value according to the steam data, wherein the steam enthalpy value is used to calculate the steam quality, obtaining a steam enthalpy value, and comparing the steam enthalpy value with a steam enthalpy value table to obtain a first steam quality, wherein the first steam quality is divided into high-quality steam, medium-quality steam, and low-quality steam; The amount of water and steam after condensation of the unqualified steam is obtained, and the second steam quality is calculated by the amount of water and the amount of steam. The first steam quality is compared with the second steam quality. If the difference between the two does not exceed a threshold, it is determined to be within a reasonable range. If the difference between the two exceeds the threshold, it is determined that a fault has occurred, and the fault information is sent to the terminal, and the terminal confirms the information.

[0006] Preferably, the step of calculating the steam enthalpy value according to the steam data, the steam enthalpy value being used to calculate the steam quality, obtaining the steam enthalpy value, comparing the steam enthalpy value with a steam enthalpy value table, obtaining the first steam quality, and the first steam quality being divided into high-quality steam, medium-quality steam and low-quality steam, specifically includes: Calculate the steam enthalpy value according to the steam quality, obtain the corresponding steam enthalpy value table, compare the steam enthalpy value with the steam enthalpy value table, and determine the steam type; Determine steam quality by comparing steam type with preset ranges of high quality steam, medium quality steam and low quality steam; The steam enthalpy value is compared with the first qualified line. If the steam enthalpy value is less than the qualified line, it is determined to be the first unqualified steam. If the steam enthalpy value is higher than the qualified line, it is determined to be the first qualified steam.

[0007] Preferably, the step of obtaining the amount of water and steam after condensation of the unqualified steam, calculating the second steam quality by the amount of water and the amount of steam, and comparing the first steam quality with the second steam quality, and determining that the difference between the two does not exceed a threshold value and is within a reasonable range, specifically includes: Obtaining the amount of water and steam after condensation of the unqualified steam, wherein the unqualified steam passes through a condenser to obtain the amount of water and steam, The second steam quality is calculated according to the water amount and the steam amount, and the second steam quality is compared with the qualified line. If the second steam quality is less than the qualified line, it is determined to be the second unqualified steam; if the second steam quality is higher than the qualified line, it is determined to be the second qualified steam; If both are unqualified, it is judged as the third unqualified steam. If the second steam quality is the second qualified steam and the difference between the two does not exceed the threshold, it is judged to be within a reasonable range.

[0008] Preferably, if the difference between the two exceeds a threshold, it is determined that a fault occurs, and the steps of sending fault information to the terminal and receiving terminal confirmation information specifically include: If the second steam quality is the second qualified steam and the difference between the two exceeds the threshold, it is determined that a fault occurs; Send fault information to the terminal and receive confirmation information from the terminal, the confirmation information including the specific fault and processing steps; Generate a fault report based on the confirmation information and store the fault report.

[0009] Preferably, the temperature of the steam is measured by a temperature sensor.

[0010] Another object of an embodiment of the present invention is to provide a steam quality monitoring system, the system comprising: A data acquisition module, which acquires steam data, wherein the steam data includes the temperature and pressure of the steam; a first steam quality module, calculating a steam enthalpy value according to steam data, wherein the steam enthalpy value is used to calculate the steam quality, obtaining a steam enthalpy value, and comparing the steam enthalpy value with a steam enthalpy value table to obtain a first steam quality, wherein the first steam quality is divided into high-quality steam, medium-quality steam, and low-quality steam; The second steam quality module obtains the condensed water volume and steam volume of the unqualified steam, calculates the second steam quality by the water volume and the steam volume, compares the first steam quality with the second steam quality, and if the difference between the two does not exceed a threshold, it is determined to be within a reasonable range; The fault judgment module determines that a fault occurs if the difference between the two exceeds the threshold, sends fault information to the terminal, and receives confirmation information from the terminal.

[0011] Preferably, the first steam quality module comprises: The steam enthalpy value unit calculates the steam enthalpy value according to the steam quality, obtains the corresponding steam enthalpy value table, compares the steam enthalpy value with the steam enthalpy value table, and determines the steam type; A steam quality determination unit compares the steam type with a preset range of high-quality steam, medium-quality steam and low-quality steam to determine the steam quality; The first determination unit compares the steam enthalpy value with the first qualified line, and determines the steam as first unqualified steam if the steam enthalpy value is less than the qualified line, and determines the steam as first qualified steam if the steam enthalpy value is higher than the qualified line.

[0012] Preferably, the second steam quality module comprises: A condensing unit is used to obtain the amount of water and steam after condensation of the unqualified steam, wherein the unqualified steam is passed through a condenser to obtain the amount of water and steam. a second determination unit, calculating a second steam quality according to the water amount and the steam amount, comparing the second steam quality with a qualified line, and determining the second steam as second unqualified steam if the second steam quality is less than the qualified line, and determining the second steam as second qualified steam if the second steam quality is higher than the qualified line; The threshold comparison unit determines that if both are unqualified, the steam is judged to be the third unqualified steam; if the second steam quality is the second qualified steam and the difference between the two does not exceed the threshold, the steam is judged to be within a reasonable range.

[0013] Preferably, the fault determination module includes: a fault determination unit, determining that a fault occurs if the second steam quality is the second qualified steam and the difference between the two exceeds a threshold; A fault handling unit, which sends fault information to the terminal and receives confirmation information from the terminal, wherein the confirmation information includes specific faults and handling steps; The fault reporting unit generates a fault report according to the confirmation information and stores the fault report.

[0014] Preferably, the temperature of the steam is measured by a temperature sensor.

[0015] A steam quality monitoring method provided by an embodiment of the present invention obtains steam data, measures the temperature by installing a temperature sensor on the inner side of a steam pipe, measures the pressure by installing a pressure sensor on the inner side of the steam pipe, calculates the steam enthalpy value according to the steam data, and the steam is divided into dry steam, wet steam, saturated steam and superheated steam. The steam quality can be determined by comparing the calculated enthalpy values ​​of saturated steam and superheated steam with the values ​​in the steam enthalpy value table, and is divided into high-quality steam, medium-quality steam and low-quality steam, that is, the higher the dryness of the steam, the better the quality. The amount of water and steam after condensation of the steam determined to be unqualified is obtained, the amount of water and steam of the unqualified steam is obtained through a condenser, the second steam quality is calculated by a steam sampling condensation method, the first steam quality is compared with the second steam quality, if the second steam quality is the second qualified steam and the difference between the two does not exceed a threshold value, it is determined to be within a reasonable range, if the second steam quality is the second qualified steam and the difference between the two exceeds a threshold value, it is determined to be a fault, and the problem that the subsequent processing is not targeted enough due to the limitation of a single detection method is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flow chart of a steam quality monitoring method provided by an embodiment of the present invention; Figure 2 A flowchart of the steps of calculating a steam enthalpy value according to steam data provided in an embodiment of the present invention, wherein the steam enthalpy value is used to calculate the steam quality, obtaining the steam enthalpy value, comparing the steam enthalpy value with a steam enthalpy value table, obtaining a first steam quality, wherein the first steam quality is divided into high-quality steam, medium-quality steam and low-quality steam; Figure 3 A flowchart of the steps of obtaining the amount of condensed water and steam of unqualified steam, calculating the second steam quality by the amount of water and the amount of steam, comparing the first steam quality with the second steam quality, and determining that the difference between the two does not exceed a threshold value and is within a reasonable range, provided in an embodiment of the present invention; Figure 4 A flowchart of the steps of determining that a fault occurs when the difference between the two exceeds a threshold, sending fault information to a terminal, and receiving terminal confirmation information provided by an embodiment of the present invention; Figure 5 An architecture diagram of a steam quality monitoring system provided by an embodiment of the present invention; Figure 6 An architectural diagram of a first steam quality module provided in an embodiment of the present invention; Figure 7 A schematic diagram of a second steam quality module provided in an embodiment of the present invention; Figure 8 This is an architecture diagram of a fault determination module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first xx script may be referred to as a second xx script, and similarly, a second xx script may be referred to as a first xx script.

[0019] like Figure 1 As shown, a steam quality monitoring method provided by an embodiment of the present invention includes: S100, obtaining steam data, where the steam data includes the temperature and pressure of the steam.

[0020] In this step, steam data is obtained, a temperature sensor or thermocouple is installed in the steam pipeline, ensuring that the sensor is in full contact with the steam, connected to a data acquisition system, and the steam temperature is recorded in real time, a pressure sensor is installed in the steam pipeline, ensuring that the sensor can accurately sense the steam pressure, connected to a data acquisition system, and the steam pressure is recorded in real time; For example, a straight pipe section was selected as the installation location. A K-type thermocouple was used and equipped with a stainless steel protective sleeve. After installation, the thermocouple probe was located in the center of the pipeline and connected to the data acquisition system. The real-time monitoring steam temperature was 190°C. A diffused silicon pressure sensor was used and a pressure point was installed on the pipeline. The sensor diaphragm was in direct contact with the steam. The sensor was connected to the data acquisition system and the real-time monitoring steam pressure was 1.5 MPa.

[0021] S200, calculating a steam enthalpy value according to steam data, wherein the steam enthalpy value is used to calculate the steam quality, obtaining a steam enthalpy value, and comparing the steam enthalpy value with a steam enthalpy value table to obtain a first steam quality, wherein the first steam quality is divided into high-quality steam, medium-quality steam, and low-quality steam.

[0022] In this step, the steam enthalpy is calculated based on the steam data. The corresponding enthalpy value is found from the steam enthalpy table according to the measured temperature and pressure, or the enthalpy value is calculated using the following formula: Saturated steam: Saturation temperature (T sat ): The temperature at which steam and water coexist at a given pressure.

[0023] Saturated liquid water enthalpy (h f ): The enthalpy of liquid water at saturation temperature.

[0024] Steam enthalpy (h g ): The enthalpy of steam at saturation temperature.

[0025] For saturated steam: h = x·h g +(1−x)·h f Where h is the enthalpy of steam and x is the steam quality (dryness); Superheated Steam: The enthalpy of superheated steam can be calculated using the following formula: h=h g +C p ·(T−T sat ) Among them, C p is the specific heat of superheated steam, T is the temperature of superheated steam, T sat is the saturation temperature, h g is the enthalpy of saturated steam.

[0026] The steam quality can be determined by comparing the actual measured steam enthalpy with the value in the steam enthalpy table.

[0027] The actual steam enthalpy is between the saturated liquid water enthalpy (h f ) and saturated steam enthalpy (h g ), the steam quality (x) can be calculated by the following formula: x= According to the usage requirements and specific application areas of steam, steam quality can be divided into different levels: High-quality steam (>95%): Suitable for applications requiring high dryness, such as pharmaceuticals, food processing, etc.

[0028] Medium quality steam (85% - 95%): suitable for general industrial applications such as heating, power equipment, etc.

[0029] Low quality steam (<85%): Typically used for less stringent applications or as initial steam for further processing.

[0030] By observing the range in which the value of X falls, we can get the quality level of the steam.

[0031] S300, obtaining the amount of water and steam after condensation of the unqualified steam, calculating the second steam quality by the amount of water and the amount of steam, comparing the first steam quality with the second steam quality, and if the difference between the two does not exceed a threshold, it is determined to be within a reasonable range.

[0032] In this step, the amount of water and steam after condensation of the steam determined to be unqualified is obtained, a steam sample of the steam determined to be unqualified is collected, the steam sample is condensed into water by a condenser, the condensed water sample is collected to ensure that there is no omission, the amount of water and steam after condensation is measured using a precision balance, and the steam quality is calculated based on the measured amount of water and steam; X= *100% Among them, m 蒸汽 is the mass of steam, m 总 is the total mass (mass of steam + mass of water); The first steam quality is compared with the second steam quality. If the two test results are consistent and both show that the steam quality is unqualified, it can be confirmed that there is indeed a problem with the steam system and further processing is required. If the second steam quality is the second qualified steam and the difference between the two does not exceed the threshold, it is judged to be within a reasonable range.

[0033] S400, if the difference between the two exceeds a threshold, it is determined that a fault occurs, and fault information is sent to the terminal, and confirmation information is received from the terminal.

[0034] In this step, if the difference between the two exceeds the threshold, if the second steam quality is the second qualified steam and the difference between the two exceeds the threshold, it is determined that a fault has occurred, and the alarm threshold of the steam quality is set in the control system. When the detection result deviates from the preset range, an alarm is triggered. For example, the alarm threshold of steam quality is set to ±5%. When the difference between two test results exceeds 5%, the system automatically triggers an alarm, prompting the operator to check the steam system and test equipment. Possible causes include: temperature sensor failure, steam trap failure or pipeline leakage, check related equipment and retest, and receive terminal confirmation information.

[0035] like Figure 2 As shown, as a preferred embodiment of the present invention, the step of calculating the steam enthalpy value according to the steam data, the steam enthalpy value is used to calculate the steam quality, the steam enthalpy value is obtained, the steam enthalpy value is compared with the steam enthalpy value table, the first steam quality is obtained, and the first steam quality is divided into high-quality steam, medium-quality steam and low-quality steam, specifically includes: S201, calculating the steam enthalpy value according to the steam quality, obtaining the corresponding steam enthalpy value table, comparing the steam enthalpy value with the steam enthalpy value table, and determining the steam type.

[0036] In this step, the steam enthalpy is calculated according to the steam quality. The corresponding enthalpy is found from the steam enthalpy table according to the measured temperature and pressure, or the enthalpy is calculated using the following formula: Saturated steam: Saturation temperature (T sat): The temperature at which steam and water coexist at a given pressure.

[0037] Saturated liquid water enthalpy (h f ): The enthalpy of liquid water at saturation temperature.

[0038] Steam enthalpy (h g ): The enthalpy of steam at saturation temperature.

[0039] For saturated steam: h = x·h g +(1−x)·h f Where h is the enthalpy of steam and x is the steam quality (dryness); Superheated Steam: The enthalpy of superheated steam can be calculated using the following formula: h=h g +C p ·(T−T sat ) Among them, C p is the specific heat of superheated steam, T is the temperature of superheated steam, T sat is the saturation temperature, h g is the enthalpy of saturated steam.

[0040] The steam quality can be determined by comparing the actual measured steam enthalpy with the value in the steam enthalpy table.

[0041] The actual steam enthalpy is between the saturated liquid water enthalpy (h f ) and saturated steam enthalpy (h g ), the steam quality (x) can be calculated by the following formula: x= For example, the measured steam temperature is 190°C and the pressure is 1.5 MPa. According to the steam enthalpy table, the saturated liquid water enthalpy (hf) is 831.9 kJ / kg and the saturated steam enthalpy (hg) is 2794 kJ / kg. Then calculate the actual steam enthalpy: h = 2600 kJ / kg Steam quality at this time: x= =0.897, the steam quality is about 89.7%.

[0042] S202, comparing the steam type with a preset range of high-quality steam, medium-quality steam, and low-quality steam to determine the steam quality.

[0043] In this step, the steam type is compared with the preset range of high-quality steam, medium-quality steam and low-quality steam to determine the steam quality. According to the use requirements and specific application areas of the steam, the steam quality can be divided into different levels: High-quality steam (>95%): Suitable for applications requiring high dryness, such as pharmaceuticals, food processing, etc.

[0044] Medium quality steam (85% - 95%): suitable for general industrial applications such as heating, power equipment, etc.

[0045] Low quality steam (<85%): Typically used for less stringent applications or as initial steam for further processing.

[0046] At this time, the calculated steam quality is about 89.7%, which is judged to be medium-quality steam.

[0047] S203, comparing the steam enthalpy value with the first qualified line, if the steam enthalpy value is less than the qualified line, it is determined to be the first unqualified steam, if the steam enthalpy value is higher than the qualified line, it is determined to be the first qualified steam.

[0048] In this step, the steam enthalpy value is compared with the first qualified line, and the steam quality below 86% is set as unqualified quality. At this time, the steam quality is about 89.7%, which is higher than the qualified line, and is determined to be the first qualified steam; If the calculated steam quality is 85.7%, the first qualified line, it is determined to be the first unqualified steam. At this time, the steam determined to be unqualified steam needs to be calculated again.

[0049] like Figure 3 As shown, as a preferred embodiment of the present invention, the step of obtaining the amount of water and steam after condensation of the unqualified steam, calculating the second steam quality by the amount of water and the amount of steam, comparing the first steam quality with the second steam quality, and determining that the difference between the two does not exceed a threshold value and is within a reasonable range, specifically includes: S301, obtaining the amount of water and steam after condensation of the unqualified steam, wherein the unqualified steam passes through a condenser to obtain the amount of water and steam.

[0050] In this step, the amount of water and steam after condensation of the steam determined to be unqualified is obtained, a steam sample of the steam determined to be unqualified is collected, the steam sample is condensed into water by a condenser, the condensed water sample is collected to ensure that there is no omission, the amount of water and steam after condensation is measured using a precision balance, and the steam quality is calculated based on the measured amount of water and steam; X= *100% Among them, m 蒸汽 is the mass of steam, m 总is the total mass (mass of steam + mass of water); For example, use a steam sampler to collect steam samples from the steam pipe, and condense the steam samples into water through a condenser. Total mass (steam + water): 1000 g, water mass: 120 g; Steam quality at this time: X= *100%=88%.

[0051] S302, calculating the second steam quality according to the water amount and the steam amount, comparing the second steam quality with the qualified line, if the second steam quality is less than the qualified line, it is determined to be second unqualified steam, if the second steam quality is higher than the qualified line, it is determined to be second qualified steam.

[0052] In this step, the second steam quality is calculated based on the water volume and steam volume. The steam quality can be divided into different levels according to the steam usage requirements and specific application areas: High-quality steam (>95%): Suitable for applications requiring high dryness, such as pharmaceuticals, food processing, etc.

[0053] Medium quality steam (85% - 95%): suitable for general industrial applications such as heating, power equipment, etc.

[0054] Low quality steam (<85%): Typically used for less stringent applications or as initial steam for further processing.

[0055] According to the second steam quality result of 88%, it can be concluded that this is medium quality steam, and it is higher than the qualified line, so it is judged as the second qualified steam; If the second steam quality result is 85%, it is determined to be the second unqualified steam.

[0056] S303, if both are unqualified, it is determined to be the third unqualified steam; if the second steam quality is the second qualified steam and the difference between the two does not exceed the threshold, it is determined to be within a reasonable range.

[0057] In this step, if both the first steam quality and the second steam quality are unqualified, it means that the steam quality is unqualified, and at the same time, it means that the result of the first steam quality is correct; If the second steam quality is the second qualified steam and the difference between the two does not exceed the threshold, the threshold is set in advance, which is the error allowed in the measurement process. For example, the threshold is set to 5%. The above-mentioned second steam quality result is 88%, and the first steam quality is about 89.7%. At this time, the error is 1.7%, indicating that the two test results are basically consistent, and it can be confirmed that the steam quality is between 88% and 90%.

[0058] like Figure 4As shown, as a preferred embodiment of the present invention, when the difference between the two exceeds a threshold, it is determined that a fault occurs, a fault message is sent to a terminal, and a step of receiving a terminal confirmation message specifically includes: S401: If the second steam quality is the second qualified steam and the difference between the two exceeds a threshold, it is determined that a fault occurs.

[0059] In this step, if the second steam quality is the second qualified steam and the first steam quality is the unqualified steam, for example, the second steam quality result is 88% and the first steam quality is about 82.7%, at this time the difference between the two is 5.3%, which exceeds the threshold of 5%, indicating that the device is faulty; There may be a temperature sensor or thermocouple failure, a steam pipe leak, or a steam trap failure, which may result in the inability to effectively discharge water. At this time, the system automatically triggers an alarm to prompt the operator to check the steam system and detection equipment.

[0060] S402, sending fault information to the terminal, and receiving confirmation information from the terminal, wherein the confirmation information includes specific faults and processing steps.

[0061] In this step, the fault information is sent to the terminal. At this time, the terminal detects and calibrates the temperature sensor and pressure sensor to ensure that they are working properly; checks the connection and operation status of the data acquisition system; checks whether there is a leak in the steam pipeline and repairs the leak point; checks the working status of the steam trap to ensure its normal operation; checks the operating status of the boiler to ensure that it provides stable steam.

[0062] Confirm whether the sensor is installed in a suitable position; check whether the sampling method is correct and ensure that the sampling process is correct; re-test the steam quality after calibrating the equipment.

[0063] After the processing is completed, the terminal receives confirmation information, including the specific fault and processing steps.

[0064] S403: Generate a fault report according to the confirmation information, and store the fault report.

[0065] In this step, a fault report is generated based on the confirmation information. The control system automatically generates a fault report, records the detection data, equipment status and possible causes of the fault. At the same time, the fault report can be sent to relevant maintenance personnel and managers via SMS, email or mobile application to reduce the possibility of the fault occurring again.

[0066] like Figure 5 As shown, a steam quality monitoring system provided by an embodiment of the present invention is characterized in that the system comprises: The data acquisition module 100 is used to acquire steam data, where the steam data includes the temperature and pressure of the steam.

[0067] In this system, the data acquisition module 100 acquires steam data, installs a temperature sensor or a thermocouple in the steam pipeline, ensures that the sensor is in full contact with the steam, connects to the data acquisition system, and records the steam temperature in real time, installs a pressure sensor in the steam pipeline, ensures that the sensor can accurately sense the steam pressure, connects to the data acquisition system, and records the steam pressure in real time; For example, a straight pipe section was selected as the installation location. A K-type thermocouple was used and equipped with a stainless steel protective sleeve. After installation, the thermocouple probe was located in the center of the pipeline and connected to the data acquisition system. The real-time monitoring steam temperature was 190°C. A diffused silicon pressure sensor was used and a pressure point was installed on the pipeline. The sensor diaphragm was in direct contact with the steam. The sensor was connected to the data acquisition system and the real-time monitoring steam pressure was 1.5 MPa.

[0068] The first steam quality module 200 is used to calculate the steam enthalpy value according to the steam data. The steam enthalpy value is used to calculate the steam quality, obtain the steam enthalpy value, compare the steam enthalpy value with the steam enthalpy value table, and obtain the first steam quality. The first steam quality is divided into high-quality steam, medium-quality steam and low-quality steam.

[0069] In the present system, the first steam quality module 200 calculates the steam enthalpy value according to the steam data, by measuring the temperature T and pressure P of the steam, looking up the corresponding enthalpy value from the steam enthalpy value table according to the measured temperature and pressure, or calculating the enthalpy value using the following formula: Saturated steam: Saturation temperature (T sat ): The temperature at which steam and water coexist at a given pressure.

[0070] Saturated liquid water enthalpy (h f ): The enthalpy of liquid water at saturation temperature.

[0071] Steam enthalpy (h g ): The enthalpy of steam at saturation temperature.

[0072] For saturated steam: h = x·h g +(1−x)·h f Where h is the enthalpy of steam and x is the steam quality (dryness); Superheated Steam: The enthalpy of superheated steam can be calculated using the following formula: h=h g +C p ·(T−T sat ) Among them, C p is the specific heat of superheated steam, T is the temperature of superheated steam, T sat is the saturation temperature, hg is the enthalpy of saturated steam.

[0073] The steam quality can be determined by comparing the actual measured steam enthalpy with the value in the steam enthalpy table.

[0074] The actual steam enthalpy is between the saturated liquid water enthalpy (h f ) and saturated steam enthalpy (h g ), the steam quality (x) can be calculated by the following formula: x= According to the usage requirements and specific application areas of steam, steam quality can be divided into different levels: High-quality steam (>95%): Suitable for applications requiring high dryness, such as pharmaceuticals, food processing, etc.

[0075] Medium quality steam (85% - 95%): suitable for general industrial applications such as heating, power equipment, etc.

[0076] Low quality steam (<85%): Typically used for less stringent applications or as initial steam for further processing.

[0077] By observing the range in which the value of X falls, we can get the quality level of the steam.

[0078] The second steam quality module 300 is used to obtain the amount of water and steam after condensation of the steam determined to be unqualified, calculate the second steam quality by the amount of water and the amount of steam, compare the first steam quality with the second steam quality, and if the difference between the two does not exceed a threshold, it is determined to be within a reasonable range.

[0079] In the present system, the second steam quality module 300 obtains the amount of water and steam after condensation of the steam determined to be unqualified, collects steam samples determined to be unqualified, condenses the steam samples into water through a condenser, collects the condensed water samples to ensure that there is no omission, uses a precision balance to measure the amount of water and steam after condensation, and calculates the steam quality based on the measured amount of water and steam; X= *100% Among them, m 蒸汽 is the mass of steam, m 总 is the total mass (mass of steam + mass of water); The first steam quality is compared with the second steam quality. If the two test results are consistent and both show that the steam quality is unqualified, it can be confirmed that there is indeed a problem with the steam system and further processing is required. If the second steam quality is the second qualified steam and the difference between the two does not exceed the threshold, it is judged to be within a reasonable range.

[0080] The fault determination module 400 is used to determine that a fault occurs when the difference between the two exceeds a threshold, send fault information to the terminal, and receive terminal confirmation information.

[0081] In this system, the fault judgment module 400 determines that the difference between the two exceeds the threshold. If the second steam quality is the second qualified steam and the difference between the two exceeds the threshold, it is determined that a fault has occurred, and the alarm threshold of the steam quality is set in the control system. When the detection result deviates from the preset range, an alarm is triggered. For example, the alarm threshold of steam quality is set to ±5%. When the difference between two test results exceeds 5%, the system automatically triggers an alarm, prompting the operator to check the steam system and test equipment. Possible causes include: temperature sensor failure, steam trap failure or pipeline leakage, check related equipment and retest, and receive terminal confirmation information.

[0082] like Figure 6 As shown, as a preferred embodiment of the present invention, the first steam quality module 200 includes: The steam enthalpy value unit 201 is used to calculate the steam enthalpy value according to the steam quality, obtain the corresponding steam enthalpy value table, compare the steam enthalpy value with the steam enthalpy value table, and determine the steam type.

[0083] In this module, the steam enthalpy value unit 201 calculates the steam enthalpy value according to the steam quality, by measuring the temperature T and pressure P of the steam, looking up the corresponding enthalpy value from the steam enthalpy value table according to the measured temperature and pressure, or calculating the enthalpy value using the following formula: Saturated steam: Saturation temperature (T sat ): The temperature at which steam and water coexist at a given pressure.

[0084] Saturated liquid water enthalpy (h f ): The enthalpy of liquid water at saturation temperature.

[0085] Steam enthalpy (h g ): The enthalpy of steam at saturation temperature.

[0086] For saturated steam: h = x·h g +(1−x)·h f Where h is the enthalpy of steam and x is the steam quality (dryness); Superheated Steam: The enthalpy of superheated steam can be calculated using the following formula: h=h g +C p ·(T−T sat ) Among them, C pis the specific heat of superheated steam, T is the temperature of superheated steam, T sat is the saturation temperature, h g is the enthalpy of saturated steam.

[0087] The steam quality can be determined by comparing the actual measured steam enthalpy with the value in the steam enthalpy table.

[0088] The actual steam enthalpy is between the saturated liquid water enthalpy (h f ) and saturated steam enthalpy (h g ), the steam quality (x) can be calculated by the following formula: x= For example, the measured steam temperature is 190°C and the pressure is 1.5 MPa. According to the steam enthalpy table, the saturated liquid water enthalpy (hf) is 831.9 kJ / kg and the saturated steam enthalpy (hg) is 2794 kJ / kg. Then calculate the actual steam enthalpy: h = 2600 kJ / kg Steam quality at this time: x= =0.897, the steam quality is about 89.7%.

[0089] The steam quality determination unit 202 is used to determine the steam quality by comparing the steam type with a preset range of high-quality steam, medium-quality steam and low-quality steam.

[0090] In this module, the steam quality determination unit 202 determines the steam quality by comparing the steam type with the preset range of high-quality steam, medium-quality steam and low-quality steam. The steam quality can be divided into different levels according to the use requirements and specific application fields of the steam: High-quality steam (>95%): Suitable for applications requiring high dryness, such as pharmaceuticals, food processing, etc.

[0091] Medium quality steam (85% - 95%): suitable for general industrial applications such as heating, power equipment, etc.

[0092] Low quality steam (<85%): Typically used for less stringent applications or as initial steam for further processing.

[0093] At this time, the calculated steam quality is about 89.7%, which is judged to be medium-quality steam.

[0094] The first determination unit 203 is used to compare the steam enthalpy value with the first qualified line. If the steam enthalpy value is less than the qualified line, it is determined as the first unqualified steam. If the steam enthalpy value is higher than the qualified line, it is determined as the first qualified steam.

[0095] In this module, the first determination unit 203 compares the steam enthalpy value with the first qualified line, and sets the steam quality below 86% as unqualified quality. At this time, the steam quality is about 89.7%, which is higher than the qualified line, and is determined to be the first qualified steam; If the calculated steam quality is 85.7%, the first qualified line, it is determined to be the first unqualified steam. At this time, the steam determined to be unqualified steam needs to be calculated again.

[0096] like Figure 7 As shown, as a preferred embodiment of the present invention, the second steam quality module 300 includes: The condensation unit 301 is used to obtain the amount of water and steam after condensation of the unqualified steam, wherein the unqualified steam passes through a condenser to obtain the amount of water and steam.

[0097] In this module, the condensation unit 301 obtains the amount of water and steam after condensation of the steam determined to be unqualified, collects the steam sample determined to be unqualified, condenses the steam sample into water through a condenser, collects the condensed water sample to ensure that there is no omission, uses a precision balance to measure the amount of water and steam after condensation, and calculates the steam quality based on the measured amount of water and steam; X= *100% Among them, m 蒸汽 is the mass of steam, m 总 is the total mass (mass of steam + mass of water); For example, use a steam sampler to collect steam samples from the steam pipe, and condense the steam samples into water through a condenser. Total mass (steam + water): 1000 g, water mass: 120 g; Steam quality at this time: X= *100%=88%.

[0098] The second determination unit 302 is used to calculate the second steam quality according to the water amount and the steam amount, compare the second steam quality with the qualified line, and if the second steam quality is less than the qualified line, determine it as second unqualified steam; if the second steam quality is higher than the qualified line, determine it as second qualified steam.

[0099] In this module, the second determination unit 302 calculates the second steam quality according to the water amount and the steam amount. The steam quality can be divided into different levels according to the use requirements and specific application fields of the steam: High-quality steam (>95%): Suitable for applications requiring high dryness, such as pharmaceuticals, food processing, etc.

[0100] Medium quality steam (85% - 95%): suitable for general industrial applications such as heating, power equipment, etc.

[0101] Low quality steam (<85%): Typically used for less stringent applications or as initial steam for further processing.

[0102] According to the second steam quality result of 88%, it can be concluded that this is medium quality steam, and it is higher than the qualified line, so it is judged as the second qualified steam; If the second steam quality result is 85%, it is determined to be the second unqualified steam.

[0103] The threshold comparison unit 303 is used to determine that the steam is the third unqualified steam if both are unqualified, and to determine that the steam is within a reasonable range if the second steam quality is the second qualified steam and the difference between the two does not exceed the threshold.

[0104] In this module, if the threshold comparison unit 303 finds both the first steam quality and the second steam quality to be unqualified, it indicates that the steam quality is unqualified, and at the same time, it indicates that the result of the first steam quality is correct; If the second steam quality is the second qualified steam and the difference between the two does not exceed the threshold, the threshold is set in advance, which is the error allowed in the measurement process. For example, the threshold is set to 5%. The above-mentioned second steam quality result is 88%, and the first steam quality is about 89.7%. At this time, the error is 1.7%, indicating that the two test results are basically consistent, and it can be confirmed that the steam quality is between 88% and 90%.

[0105] like Figure 8 As shown, as a preferred embodiment of the present invention, the fault determination module 400 includes: The fault determination unit 401 is configured to determine that a fault occurs if the second steam quality is the second qualified steam and the difference between the two exceeds a threshold.

[0106] In this module, if the second steam quality is the second qualified steam and the first steam quality is the unqualified steam, for example, the second steam quality result is 88% and the first steam quality is about 82.7%, and the difference between the two is 5.3%, which exceeds the threshold value of 5%, then it means that the device is faulty; There may be a temperature sensor or thermocouple failure, a steam pipe leak, or a steam trap failure, which may result in the inability to effectively discharge water. At this time, the system automatically triggers an alarm to prompt the operator to check the steam system and detection equipment.

[0107] The fault processing unit 402 is used to send fault information to the terminal and receive terminal confirmation information, wherein the confirmation information includes specific faults and processing steps.

[0108] In this module, the fault processing unit 402 sends fault information to the terminal. At this time, the terminal detects and calibrates the temperature sensor and pressure sensor to ensure that they are working properly; checks the connection and operation status of the data acquisition system; checks whether there is a leak in the steam pipeline and repairs the leak point; checks the working status of the steam trap to ensure its normal operation; checks the operating status of the boiler to ensure that it provides stable steam.

[0109] Confirm whether the sensor is installed in a suitable position; check whether the sampling method is correct and ensure that the sampling process is correct; re-test the steam quality after calibrating the equipment.

[0110] The fault reporting unit 403 is used to generate a fault report according to the confirmation information and store the fault report.

[0111] In this module, the fault reporting unit 403 generates a fault report based on the confirmation information. The control system automatically generates a fault report, records the detection data, equipment status and possible causes of the fault, and can send the fault report to relevant maintenance personnel and managers via SMS, email or mobile application to reduce the possibility of the fault occurring again.

[0112] In one embodiment, a computer device is provided, the computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the following steps are implemented: Acquiring steam data, wherein the steam data includes temperature and pressure of the steam; Calculating a steam enthalpy value according to the steam data, wherein the steam enthalpy value is used to calculate the steam quality, obtaining a steam enthalpy value, and comparing the steam enthalpy value with a steam enthalpy value table to obtain a first steam quality, wherein the first steam quality is divided into high-quality steam, medium-quality steam, and low-quality steam; The amount of water and steam after condensation of the unqualified steam is obtained, and the second steam quality is calculated by the amount of water and the amount of steam. The first steam quality is compared with the second steam quality. If the difference between the two does not exceed a threshold, it is determined to be within a reasonable range. If the difference between the two exceeds the threshold, it is determined that a fault has occurred, and the fault information is sent to the terminal, and the terminal confirms the information.

[0113] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the processor performs the following steps: Acquiring steam data, wherein the steam data includes temperature and pressure of the steam; Calculating a steam enthalpy value according to the steam data, wherein the steam enthalpy value is used to calculate the steam quality, obtaining a steam enthalpy value, and comparing the steam enthalpy value with a steam enthalpy value table to obtain a first steam quality, wherein the first steam quality is divided into high-quality steam, medium-quality steam, and low-quality steam; The amount of water and steam after condensation of the unqualified steam is obtained, and the second steam quality is calculated by the amount of water and the amount of steam. The first steam quality is compared with the second steam quality. If the difference between the two does not exceed a threshold, it is determined to be within a reasonable range. If the difference between the two exceeds the threshold, it is determined that a fault has occurred, and the fault information is sent to the terminal, and the terminal confirms the information.

[0114] It should be understood that, although each step in the flow chart of each embodiment of the present invention is shown in sequence according to the indication of the arrow, these steps are not necessarily performed in sequence according to the order indicated by the arrow. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be performed in other orders. Moreover, at least a portion of the steps in each embodiment may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and the execution order of these sub-steps or stages is not necessarily performed in sequence, but can be performed in turn or alternately with at least a portion of other steps or sub-steps or stages of other steps. Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0115] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0117] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam quality monitoring method, characterized in that: The method comprises: Acquiring steam data, wherein the steam data includes temperature and pressure of the steam; Calculating a steam enthalpy value according to steam data, wherein the steam enthalpy value includes a saturated steam enthalpy value and a superheated steam enthalpy value, and the steam enthalpy value is used to calculate the steam quality, thereby obtaining a steam enthalpy value, and comparing the steam enthalpy value with a steam enthalpy value table to obtain a first steam quality, wherein the first steam quality is divided into high-quality steam, medium-quality steam, and low-quality steam; The saturated steam: h = x·h g +(1−x)·h f , the superheated steam h=h g +C p ·(T−T sat ); The amount of water and steam after condensation of the unqualified steam is obtained, and the second steam quality is calculated by the amount of water and the amount of steam. The first steam quality is compared with the second steam quality. If the difference between the two does not exceed a threshold, it is determined to be within a reasonable range. The calculation formula of the first steam quality and the second steam quality is X= *100%; If the difference between the two exceeds the threshold, it is determined that a fault has occurred, and the fault information is sent to the terminal, and the terminal confirms the information.

2. A steam quality monitoring method according to claim 1, characterized in that: The step of calculating the steam enthalpy value according to the steam data, using the steam enthalpy value to calculate the steam quality, obtaining the steam enthalpy value, comparing the steam enthalpy value with a steam enthalpy value table, obtaining the first steam quality, wherein the first steam quality is divided into high-quality steam, medium-quality steam and low-quality steam, specifically includes: Calculate the steam enthalpy value according to the steam quality, obtain the corresponding steam enthalpy value table, compare the steam enthalpy value with the steam enthalpy value table, and determine the steam type; Determine steam quality by comparing steam type with preset ranges of high quality steam, medium quality steam and low quality steam; The steam enthalpy value is compared with the first qualified line. If the steam enthalpy value is less than the qualified line, it is determined to be the first unqualified steam. If the steam enthalpy value is higher than the qualified line, it is determined to be the first qualified steam.

3. A steam quality monitoring method according to claim 1, characterized in that: The step of obtaining the amount of water and steam after condensation of the unqualified steam, calculating the second steam quality by the amount of water and the amount of steam, and comparing the first steam quality with the second steam quality, and determining that the difference between the two does not exceed a threshold value and is within a reasonable range, specifically includes: Obtaining the amount of water and steam after condensation of the unqualified steam, wherein the unqualified steam passes through a condenser to obtain the amount of water and steam; The second steam quality is calculated according to the water amount and the steam amount, and the second steam quality is compared with the qualified line. If the second steam quality is less than the qualified line, it is determined to be the second unqualified steam; if the second steam quality is higher than the qualified line, it is determined to be the second qualified steam; If both are unqualified, it is judged as the third unqualified steam. If the second steam quality is the second qualified steam and the difference between the two does not exceed the threshold, it is judged to be within a reasonable range.

4. A steam quality monitoring method according to claim 1, characterized in that: If the difference between the two exceeds a threshold, it is determined that a fault occurs, and the steps of sending fault information to the terminal and receiving terminal confirmation information specifically include: If the second steam quality is the second qualified steam and the difference between the two exceeds the threshold, it is determined that a fault occurs; Send fault information to the terminal and receive confirmation information from the terminal, the confirmation information including the specific fault and processing steps; Generate a fault report based on the confirmation information and store the fault report.

5. A steam quality monitoring method according to claim 1, characterized in that: The temperature of the steam is measured by a temperature sensor.

6. A steam quality monitoring system, characterized in that: The system comprises: A data acquisition module, which acquires steam data, wherein the steam data includes the temperature and pressure of the steam; The first steam quality module calculates the steam enthalpy value according to the steam data. The steam enthalpy value is used to calculate the steam quality, obtain the steam enthalpy value, compare the steam enthalpy value with the steam enthalpy value table, and obtain the first steam quality. The first steam quality is divided into high-quality steam, medium-quality steam and low-quality steam; The saturated steam: h=x·h g +(1−x)·h f , the superheated steam h=h g +C p ·(T−T sat ); The second steam quality module obtains the condensed water volume and steam volume of the unqualified steam, calculates the second steam quality by the water volume and steam volume, compares the first steam quality with the second steam quality, and if the difference between the two does not exceed the threshold, it is determined to be within a reasonable range; the calculation formula of the first steam quality and the second steam quality is X= *100%; The fault judgment module determines that a fault occurs if the difference between the two exceeds the threshold, sends fault information to the terminal, and receives confirmation information from the terminal.

7. A steam quality monitoring system according to claim 6, characterized in that: The first steam quality module comprises: The steam enthalpy value unit calculates the steam enthalpy value according to the steam quality, obtains the corresponding steam enthalpy value table, compares the steam enthalpy value with the steam enthalpy value table, and determines the steam type; A steam quality determination unit compares the steam type with a preset range of high-quality steam, medium-quality steam and low-quality steam to determine the steam quality; The first determination unit compares the steam enthalpy value with the first qualified line, and determines the steam as first unqualified steam if the steam enthalpy value is less than the qualified line, and determines the steam as first qualified steam if the steam enthalpy value is higher than the qualified line.

8. A steam quality monitoring system according to claim 7, characterized in that: The second steam quality module comprises: A condensing unit, for obtaining the amount of water and steam after condensation of the unqualified steam, wherein the unqualified steam passes through a condenser to obtain the amount of water and steam; a second determination unit, calculating a second steam quality according to the water amount and the steam amount, comparing the second steam quality with a qualified line, and determining the second steam as second unqualified steam if the second steam quality is less than the qualified line, and determining the second steam as second qualified steam if the second steam quality is higher than the qualified line; The threshold comparison unit determines that if both are unqualified, the steam is judged to be the third unqualified steam; if the second steam quality is the second qualified steam and the difference between the two does not exceed the threshold, the steam is judged to be within a reasonable range.

9. A steam quality monitoring system according to claim 8, characterized in that: The fault determination module comprises: a fault determination unit, determining that a fault occurs if the second steam quality is the second qualified steam and the difference between the two exceeds a threshold; A fault handling unit, which sends fault information to the terminal and receives confirmation information from the terminal, wherein the confirmation information includes specific faults and handling steps; The fault reporting unit generates a fault report according to the confirmation information and stores the fault report.

10. A steam quality monitoring system according to claim 9, characterized in that: The temperature of the steam is measured by a temperature sensor.

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