A plate heat exchanger based on the Internet of Things

Abstract

The present invention belongs to the field of heat exchange technology and relates to a plate heat exchanger based on the Internet of Things. The system includes: temperature adjustment judgment, margin judgment, temperature adjustment, adjustment accuracy analysis, cleanliness analysis and quality judgment, and a database. The temperature adjustment judgment module monitors the inlet temperature of the hot fluid and starts adjustment when necessary. The margin judgment module analyzes the flow rate and flow rate margin of the cold fluid to ensure the feasibility of adjustment. The temperature adjustment module accurately controls the outlet temperature of the hot fluid to a preset target by adjusting the flow rate and flow rate of the cold fluid. The adjustment accuracy analysis module counts the adjustment accuracy index to ensure the quality of adjustment. The cleanliness analysis module uses ultrasonic technology to evaluate the cleanliness of the heat exchanger to prevent the influence of dirt. The plate heat exchanger quality judgment module comprehensively evaluates the accuracy and cleanliness index to evaluate the quality of the heat exchanger and timely warns of potential problems. The database supports the storage of key parameters to provide a data basis for analysis and decision-making.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchange and relates to a plate heat exchanger based on the Internet of Things. Background Art

[0002] With the continuous development of industrial technology, heat exchange equipment plays a vital role in various industrial processes, and plate heat exchangers have become the leaders in the field of heat exchange with their high efficiency, compactness, and easy maintenance. However, the operation and management of traditional plate heat exchangers often rely on manual inspections and regular maintenance, which is not only inefficient, but also difficult to grasp the operating status of the equipment in a timely and accurate manner, resulting in reduced equipment performance, increased energy consumption, and even safety accidents.

[0003] In the prior art, when the temperature of the hot fluid in the plate heat exchanger suddenly rises or falls, the system may not be able to adjust quickly to maintain the hot fluid outlet temperature within a preset range, resulting in temperature fluctuations beyond the allowable range. Large temperature fluctuations will aggravate the thermal stress of the internal materials of the plate heat exchanger and increase the risk of thermal fatigue damage. In the long run, this thermal stress cycle may cause aging, cracking or even rupture of the equipment materials, thereby shortening the service life of the heat exchanger and increasing the cost of replacement and maintenance.

[0004] In addition, the existing technology cannot obtain the cleanliness status of the plate heat exchanger in a timely manner. The cleanliness status assessment of the plate heat exchanger usually relies on regular manual inspections or cleaning plans. This method is not only time-consuming and labor-intensive, but also has a time lag, that is, the plate heat exchanger may have accumulated a lot of dirt between two inspections, affecting the heat exchange efficiency of the plate heat exchanger. Summary of the invention

[0005] In view of this, in order to solve the problems raised in the above background technology, a plate heat exchanger based on the Internet of Things is proposed.

[0006] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides a plate heat exchanger based on the Internet of Things, including: a temperature adjustment judgment module: used to monitor the inlet temperature of the hot fluid of the plate heat exchanger, and then determine whether to adjust the inlet temperature of the hot fluid of the plate heat exchanger.

[0007] The surplus judgment module is used to collect the mass flow rate and flow rate of the cold fluid of the plate heat exchanger when adjusting the inlet temperature of the hot fluid of the plate heat exchanger, and judge whether there is a surplus in the mass flow rate and flow rate of the cold fluid of the plate heat exchanger.

[0008] Temperature regulation module: used to collect the mass flow rate of the hot fluid of the plate heat exchanger and adjust the mass flow rate of the cold fluid of the plate heat exchanger when there is a margin in the mass flow rate and flow rate of the cold fluid of the plate heat exchanger, and determine whether the inlet temperature of the hot fluid can be adjusted to the preset target outlet temperature by adjusting the flow rate of the cold fluid of the plate heat exchanger. When the outlet temperature of the hot fluid of the plate heat exchanger cannot be adjusted to the preset target outlet temperature, the flow rate of the cold fluid of the plate heat exchanger is adjusted to obtain the adjusted outlet temperature of the hot fluid of the plate heat exchanger.

[0009] Regulation accuracy analysis module: used to collect the outlet temperature of the hot fluid of the regulated plate heat exchanger, calculate the temperature regulation accuracy index of the plate heat exchanger, determine whether the temperature regulation of the plate heat exchanger is qualified, and then issue an early warning.

[0010] Cleanliness analysis module: used to collect the propagation time and reflected wave intensity of the ultrasonic wave at each monitoring point of the plate heat exchanger, analyze the cleanliness index of the plate heat exchanger, determine whether the cleanliness of the plate heat exchanger is qualified, and then issue an early warning.

[0011] Plate heat exchanger quality judgment module: used to analyze the quality index of the plate heat exchanger based on the temperature adjustment accuracy index and cleanliness index of the plate heat exchanger, and then judge whether the quality of the plate heat exchanger is qualified, and then issue an early warning.

[0012] Database: used to store the heat transfer coefficient of the plate heat exchanger, the specific heat capacity of the hot fluid and the specific heat capacity of the cold fluid of the plate heat exchanger, the density of the cold fluid of the plate heat exchanger, and the inner diameter of the cold fluid channel of the plate heat exchanger.

[0013] Preferably, the specific process of determining whether to adjust the inlet temperature of the hot fluid of the plate heat exchanger is as follows: comparing the inlet temperature of the hot fluid of the plate heat exchanger with a preset inlet temperature of the hot fluid; if the inlet temperature of the hot fluid of the plate heat exchanger is greater than or less than the preset inlet temperature of the hot fluid, adjusting the inlet temperature of the hot fluid of the plate heat exchanger.

[0014] Preferably, the specific process of determining whether the inlet temperature of the hot fluid can be adjusted to the preset target outlet temperature by adjusting the flow rate of the cold fluid of the plate heat exchanger is as follows: the mass flow rates of the hot fluid and the cold fluid of the plate heat exchanger are recorded as and , the heat transfer coefficient of the plate heat exchanger, the specific heat capacity of the hot fluid, and the specific heat capacity of the cold fluid are extracted from the database.

[0015] The difference between the inlet temperature of the hot fluid of the plate heat exchanger and the preset target outlet temperature of the hot fluid is obtained by subtracting the preset target outlet temperature of the hot fluid from the inlet temperature of the hot fluid of the plate heat exchanger, which is recorded as .

[0016] The preset target outlet temperature of the cold fluid minus the inlet temperature of the cold fluid of the plate heat exchanger is subtracted to obtain the difference between the preset target outlet temperature of the cold fluid and the inlet temperature of the cold fluid of the plate heat exchanger, which is recorded as .

[0017] Calculate the target mass flow rate of the cold fluid in the plate heat exchanger , ,in represents the heat load of the hot fluid in the plate heat exchanger, , represents the specific heat capacity of the hot fluid in the plate heat exchanger, Represents the specific heat capacity of the cold fluid in the plate heat exchanger.

[0018] The target mass flow rate of the cold fluid of the plate heat exchanger is compared with the preset maximum mass flow rate of the cold fluid. If the target mass flow rate of the cold fluid of the plate heat exchanger is less than the preset maximum mass flow rate of the cold fluid, the inlet temperature of the hot fluid can be adjusted to the preset target outlet temperature by adjusting the flow rate of the cold fluid of the plate heat exchanger; if the target mass flow rate of the cold fluid of the plate heat exchanger is greater than or equal to the preset maximum mass flow rate of the cold fluid, the flow rate of the cold fluid of the plate heat exchanger is adjusted.

[0019] Preferably, the step of obtaining the adjusted outlet temperature of the hot fluid of the plate heat exchanger comprises: extracting the density of the cold fluid of the plate heat exchanger and the inner diameter of the cold fluid channel from the database, and recording them as and .

[0020] Analyze the target flow rate of the cold fluid in a plate heat exchanger , ,in represents the cross-sectional area of ​​the cold fluid channel of the plate heat exchanger, .

[0021] Preferably, the step of judging whether the temperature adjustment of the plate heat exchanger is qualified comprises: recording the outlet temperature of the hot fluid of the plate heat exchanger after adjustment as , Statistical plate heat exchanger temperature regulation accuracy index , ,in Indicates the target outlet temperature of the hot fluid of the set plate heat exchanger.

[0022] The temperature regulation accuracy index of the plate heat exchanger is compared with a preset temperature regulation accuracy threshold. If the temperature regulation accuracy index of the plate heat exchanger is greater than the preset temperature regulation accuracy threshold, the temperature regulation of the plate heat exchanger is qualified.

[0023] Preferably, the step of judging whether the cleanliness of the plate heat exchanger is qualified comprises: collecting the propagation time and the reflected wave intensity of the ultrasonic wave at each monitoring point of the plate heat exchanger by an ultrasonic sensor, and recording them as and ,in Indicates The number corresponding to each monitoring point, .

[0024] The plate material of the plate heat exchanger is obtained through the label, and the standard propagation time and standard reflection wave intensity of the ultrasonic wave of each plate material of the plate heat exchanger are extracted from the database, and the standard propagation time and standard reflection wave intensity of the ultrasonic wave of the plate heat exchanger are screened out and recorded as and .

[0025] Analyzing the cleanliness index of plate heat exchangers , ,in Indicates the plate heat exchanger The relative intensity index of the reflected wave at each monitoring point, , Represents the relative intensity index of the allowable reflected wave of the plate heat exchanger. and They represent the weight factors corresponding to the propagation time deviation value and the relative intensity index deviation value of the reflected wave of the plate heat exchanger, .

[0026] Preferably, judging whether the cleanliness of the plate heat exchanger is qualified includes: comparing the cleanliness index of the plate heat exchanger with a preset cleanliness threshold; if the cleanliness index of the plate heat exchanger is greater than the preset cleanliness threshold, the cleanliness of the plate heat exchanger is qualified.

[0027] Preferably, the specific calculation formula for analyzing the quality index of the plate heat exchanger is: ,in and They represent the weight factors corresponding to the cleanliness index and temperature regulation accuracy index of the plate heat exchanger, respectively, and .

[0028] Preferably, the determining whether the quality of the plate heat exchanger is qualified includes: comparing the quality qualification index of the plate heat exchanger with a preset quality qualification index threshold; if the quality qualification index threshold of the plate heat exchanger is greater than the preset quality qualification index threshold, the quality of the plate heat exchanger is qualified.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) When there is a surplus in the mass flow rate of the cold fluid in the plate heat exchanger, the present invention adjusts this parameter to quickly respond to changes in the temperature of the hot fluid, thereby maintaining the hot fluid outlet temperature of the plate heat exchanger within a preset range, thereby enhancing the stability and reliability of the entire heat exchange system. By reasonably adjusting the flow rate and flow velocity of the cold fluid, the impact of excessive temperature fluctuations on the plate heat exchanger material can be avoided, reducing thermal fatigue damage to the equipment, thereby extending the service life of the heat exchanger.

[0030] (2) The present invention collects the outlet temperature of the hot fluid of the plate heat exchanger after adjustment, calculates the temperature adjustment accuracy index of the plate heat exchanger, determines whether the temperature adjustment of the plate heat exchanger is qualified, and then issues an early warning. It can quantitatively evaluate the current temperature control effect, and once it is found that the temperature adjustment deviates from the preset range, it can quickly identify and take corresponding early warning or corrective measures to avoid potential operating problems or failures.

[0031] (3) The present invention collects the propagation time and reflected wave intensity of the ultrasonic wave at each monitoring point of the plate heat exchanger and analyzes the cleanliness index of the plate heat exchanger, thereby immediately obtaining the current cleanliness status of the plate heat exchanger without waiting for regular inspection. In addition, the cleanliness index of the plate heat exchanger directly affects the heat exchange efficiency of the plate heat exchanger. By monitoring the cleanliness index of the plate heat exchanger, it can be ensured that the equipment is always in good working condition.

[0032] (4) The present invention analyzes the quality index of the plate heat exchanger based on the temperature regulation accuracy index and cleanliness index of the plate heat exchanger, and then determines whether the quality of the plate heat exchanger is qualified, and then issues an early warning, which can more fully reflect the comprehensive performance and quality status of the plate heat exchanger. This can not only reduce the downtime and production losses caused by plate heat exchanger failures, but also reduce the high costs caused by failure repairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the connection of each module of the system of the present invention.

[0035] Figure 2 Schematic diagram of the process of the system of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figure 1 and Figure 2 As shown, the present invention provides a plate heat exchanger based on the Internet of Things, including: a temperature adjustment judgment module, a surplus judgment module, a temperature adjustment module, an adjustment accuracy analysis module, a cleanliness analysis module, a plate heat exchanger quality judgment module and a database.

[0038] The remaining quantity judgment module is respectively connected to the temperature adjustment judgment module and the temperature adjustment module, the temperature adjustment module is respectively connected to the remaining quantity judgment module and the adjustment accuracy analysis module, the adjustment accuracy analysis module is respectively connected to the temperature adjustment module and the plate heat exchanger quality judgment module, the cleanliness analysis module is connected to the plate heat exchanger quality judgment module, and the database is connected to the temperature adjustment module.

[0039] Temperature adjustment judgment module: used to monitor the inlet temperature of the hot fluid of the plate heat exchanger, and then judge whether to adjust the inlet temperature of the hot fluid of the plate heat exchanger.

[0040] Furthermore, the specific process of determining whether to adjust the inlet temperature of the hot fluid of the plate heat exchanger is as follows: comparing the inlet temperature of the hot fluid of the plate heat exchanger with a preset inlet temperature of the hot fluid; if the inlet temperature of the hot fluid of the plate heat exchanger is greater than or less than the preset inlet temperature of the hot fluid, adjusting the inlet temperature of the hot fluid of the plate heat exchanger.

[0041] As a preferred embodiment, the inlet temperature of the hot fluid of the plate heat exchanger is monitored by a temperature sensor.

[0042] The present invention monitors the inlet temperature of the hot fluid of the plate heat exchanger and determines whether to adjust the inlet temperature of the hot fluid of the plate heat exchanger. It can timely discover the situation that the temperature deviates from the set value, and quickly take measures to adjust it, so as to ensure that the heat exchanger always operates in the best state.

[0043] The surplus judgment module is used to collect the mass flow rate and flow rate of the cold fluid of the plate heat exchanger when adjusting the inlet temperature of the hot fluid of the plate heat exchanger, and judge whether there is a surplus in the mass flow rate and flow rate of the cold fluid of the plate heat exchanger.

[0044] Furthermore, the specific process of determining whether there is a margin in the mass flow rate and flow rate of the cold fluid of the plate heat exchanger is as follows: comparing the mass flow rate of the cold fluid of the plate heat exchanger with a preset mass flow rate threshold of the cold fluid; if the mass flow rate of the cold fluid of the plate heat exchanger is less than the preset mass flow rate threshold of the cold fluid, then there is a margin in the mass flow rate of the cold fluid of the plate heat exchanger.

[0045] The flow rate of the cold fluid of the plate heat exchanger is compared with a preset flow rate threshold of the cold fluid. If the flow rate of the cold fluid of the plate heat exchanger is less than the preset flow rate threshold of the cold fluid, there is a margin in the flow rate of the cold fluid of the plate heat exchanger.

[0046] The present invention collects the mass flow rate and flow velocity of the cold fluid of the plate heat exchanger to determine whether there is a surplus in the mass flow rate and flow velocity of the cold fluid of the plate heat exchanger, so as to grasp the operating status of the plate heat exchanger at any time and improve the management level.

[0047] As a preferred embodiment, the specific process of collecting the mass flow rates of the cold fluid and the hot fluid of the plate heat exchanger is: a mass flow meter is set on the inlet or outlet pipe of the plate heat exchanger, and the mass flow rates of the cold fluid and the hot fluid of the plate heat exchanger are directly collected by the mass flow meter.

[0048] The specific process of collecting the flow rate of the cold fluid of the plate heat exchanger is: a flow meter is set at the cold fluid inlet and outlet of the plate heat exchanger, and the flow rate of the cold fluid of the plate heat exchanger is collected by the flow meter.

[0049] Temperature regulation module: used to collect the mass flow rate of the hot fluid of the plate heat exchanger and adjust the mass flow rate of the cold fluid of the plate heat exchanger when there is a margin in the mass flow rate and flow rate of the cold fluid of the plate heat exchanger, and determine whether the inlet temperature of the hot fluid can be adjusted to the preset target outlet temperature by adjusting the flow rate of the cold fluid of the plate heat exchanger. When the outlet temperature of the hot fluid of the plate heat exchanger cannot be adjusted to the preset target outlet temperature, the flow rate of the cold fluid of the plate heat exchanger is adjusted to obtain the adjusted outlet temperature of the hot fluid of the plate heat exchanger.

[0050] Furthermore, the specific process of determining whether the inlet temperature of the hot fluid can be adjusted to the preset target outlet temperature by adjusting the flow rate of the cold fluid of the plate heat exchanger is as follows: the mass flow rates of the hot fluid and the cold fluid of the plate heat exchanger are recorded as and , the heat transfer coefficient of the plate heat exchanger, the specific heat capacity of the hot fluid, and the specific heat capacity of the cold fluid are extracted from the database.

[0051] The difference between the inlet temperature of the hot fluid of the plate heat exchanger and the preset target outlet temperature of the hot fluid is obtained by subtracting the preset target outlet temperature of the hot fluid from the inlet temperature of the hot fluid of the plate heat exchanger, which is recorded as .

[0052] The preset target outlet temperature of the cold fluid minus the inlet temperature of the cold fluid of the plate heat exchanger is subtracted to obtain the difference between the preset target outlet temperature of the cold fluid and the inlet temperature of the cold fluid of the plate heat exchanger, which is recorded as .

[0053] Calculate the target mass flow rate of the cold fluid in the plate heat exchanger , ,in represents the heat load of the hot fluid in the plate heat exchanger, , represents the specific heat capacity of the hot fluid in the plate heat exchanger, Represents the specific heat capacity of the cold fluid in the plate heat exchanger.

[0054] The target mass flow rate of the cold fluid of the plate heat exchanger is compared with the preset maximum mass flow rate of the cold fluid. If the target mass flow rate of the cold fluid of the plate heat exchanger is less than the preset maximum mass flow rate of the cold fluid, the inlet temperature of the hot fluid can be adjusted to the preset target outlet temperature by adjusting the flow rate of the cold fluid of the plate heat exchanger; if the target mass flow rate of the cold fluid of the plate heat exchanger is greater than or equal to the preset maximum mass flow rate of the cold fluid, the flow rate of the cold fluid of the plate heat exchanger is adjusted.

[0055] As a preferred embodiment, the inlet temperature of the cold fluid of the plate heat exchanger is acquired by a temperature sensor.

[0056] Further, the step of obtaining the adjusted outlet temperature of the hot fluid of the plate heat exchanger comprises: extracting the density of the cold fluid of the plate heat exchanger and the inner diameter of the cold fluid channel from the database, and recording them as and .

[0057] Analyze the target flow rate of the cold fluid in a plate heat exchanger , ,in represents the cross-sectional area of ​​the cold fluid channel of the plate heat exchanger, .

[0058] The present invention quickly responds to changes in the temperature of the hot fluid by adjusting this parameter when there is a surplus in the mass flow rate of the cold fluid in the plate heat exchanger, thereby maintaining the hot fluid outlet temperature of the plate heat exchanger to fluctuate within a preset range, thereby enhancing the stability and reliability of the entire heat exchange system. By reasonably adjusting the flow rate and flow velocity of the cold fluid, the influence on the plate heat exchanger material caused by excessive temperature fluctuations can be avoided, reducing thermal fatigue damage to the equipment, thereby extending the service life of the heat exchanger.

[0059] Regulation accuracy analysis module: used to collect the outlet temperature of the hot fluid of the regulated plate heat exchanger, calculate the temperature regulation accuracy index of the plate heat exchanger, determine whether the temperature regulation of the plate heat exchanger is qualified, and then issue an early warning.

[0060] Further, the determination of whether the temperature adjustment of the plate heat exchanger is qualified includes: recording the outlet temperature of the hot fluid of the adjusted plate heat exchanger as , Statistical plate heat exchanger temperature regulation accuracy index , ,in Indicates the target outlet temperature of the hot fluid of the set plate heat exchanger.

[0061] The temperature regulation accuracy index of the plate heat exchanger is compared with a preset temperature regulation accuracy threshold. If the temperature regulation accuracy index of the plate heat exchanger is greater than the preset temperature regulation accuracy threshold, the temperature regulation of the plate heat exchanger is qualified.

[0062] The present invention collects the outlet temperature of the hot fluid of the regulated plate heat exchanger, calculates the temperature regulation accuracy index of the plate heat exchanger, determines whether the temperature regulation of the plate heat exchanger is qualified, and then issues an early warning. It can quantitatively evaluate the current temperature control effect, and once it is found that the temperature regulation deviates from the preset range, it can quickly identify and take corresponding early warning or corrective measures to avoid potential operating problems or failures.

[0063] Cleanliness analysis module: used to collect the propagation time and reflected wave intensity of the ultrasonic wave at each monitoring point of the plate heat exchanger, analyze the cleanliness index of the plate heat exchanger, determine whether the cleanliness of the plate heat exchanger is qualified, and then issue an early warning.

[0064] Furthermore, the determination of whether the cleanliness of the plate heat exchanger is qualified includes: collecting the propagation time and the reflected wave intensity of the ultrasonic wave at each monitoring point of the plate heat exchanger through the ultrasonic sensor, which are recorded as and ,in Indicates The number corresponding to each monitoring point, .

[0065] The plate material of the plate heat exchanger is obtained through the label, and the standard propagation time and standard reflection wave intensity of the ultrasonic wave of each plate material of the plate heat exchanger are extracted from the database, and the standard propagation time and standard reflection wave intensity of the ultrasonic wave of the plate heat exchanger are screened out and recorded as and .

[0066] Analyzing the cleanliness index of plate heat exchangers , ,in Indicates the plate heat exchanger The relative intensity index of the reflected wave at each monitoring point, , Represents the relative intensity index of the allowable reflected wave of the plate heat exchanger. and They represent the weight factors corresponding to the propagation time deviation value and the relative intensity index deviation value of the reflected wave of the plate heat exchanger, .

[0067] Further, the determining whether the cleanliness of the plate heat exchanger is qualified includes: comparing the cleanliness index of the plate heat exchanger with a preset cleanliness threshold; if the cleanliness index of the plate heat exchanger is greater than the preset cleanliness threshold, the cleanliness of the plate heat exchanger is qualified.

[0068] The present invention collects the propagation time and reflected wave intensity of the ultrasonic wave at each monitoring point of the plate heat exchanger and analyzes the cleanliness index of the plate heat exchanger, so that the current cleanliness status of the plate heat exchanger can be obtained immediately without waiting for regular inspection. The cleanliness index of the plate heat exchanger directly affects the heat exchange efficiency of the plate heat exchanger. By monitoring the cleanliness index of the plate heat exchanger, it can be ensured that the equipment is always in good working condition.

[0069] Plate heat exchanger quality judgment module: used to analyze the quality index of the plate heat exchanger based on the temperature adjustment accuracy index and cleanliness index of the plate heat exchanger, and then judge whether the quality of the plate heat exchanger is qualified, and then issue an early warning.

[0070] Furthermore, the specific calculation formula for analyzing the quality index of the plate heat exchanger is: ,in and They represent the weight factors corresponding to the cleanliness index and temperature regulation accuracy index of the plate heat exchanger, respectively, and .

[0071] As a preferred embodiment, the and They can be set to 0.6 and 0.4 respectively. The cleanliness index directly affects the heat transfer efficiency of the plate heat exchanger. If there is dirt on the surface of the plate heat exchanger, the heat transfer efficiency will be reduced and energy consumption will increase. The accuracy of temperature regulation is very important for some production processes to ensure product quality and production efficiency. Therefore, the weight factor corresponding to the cleanliness index of the plate heat exchanger is greater than the weight factor corresponding to the temperature regulation accuracy index.

[0072] Furthermore, the determination of whether the quality of the plate heat exchanger is qualified includes: comparing the quality qualification index of the plate heat exchanger with a preset quality qualification index threshold; if the quality qualification index threshold of the plate heat exchanger is greater than the preset quality qualification index threshold, the quality of the plate heat exchanger is qualified.

[0073] The present invention analyzes the quality index of the plate heat exchanger based on the temperature regulation accuracy index and the cleanliness index of the plate heat exchanger, and then determines whether the quality of the plate heat exchanger is qualified, and then issues an early warning, which can more fully reflect the comprehensive performance and quality status of the plate heat exchanger. This can not only reduce the downtime and production losses caused by plate heat exchanger failures, but also reduce the high costs caused by failure repairs.

[0074] Database: used to store the heat transfer coefficient of the plate heat exchanger, the specific heat capacity of the hot fluid and the specific heat capacity of the cold fluid of the plate heat exchanger, the density of the cold fluid of the plate heat exchanger, and the inner diameter of the cold fluid channel of the plate heat exchanger.

[0075] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A plate heat exchanger based on the Internet of Things, characterized in that: include: Temperature adjustment judgment module: used to monitor the inlet temperature of the hot fluid of the plate heat exchanger, and then judge whether to adjust the inlet temperature of the hot fluid of the plate heat exchanger; The surplus judgment module is used to collect the mass flow rate and flow rate of the cold fluid of the plate heat exchanger when adjusting the inlet temperature of the hot fluid of the plate heat exchanger, and judge whether there is a surplus in the mass flow rate and flow rate of the cold fluid of the plate heat exchanger; Temperature adjustment module: used for collecting the mass flow rate of the hot fluid of the plate heat exchanger and adjusting the mass flow rate of the cold fluid of the plate heat exchanger when there is a margin in both the mass flow rate and the flow rate of the cold fluid of the plate heat exchanger, and judging whether the inlet temperature of the hot fluid can be adjusted to the preset target outlet temperature by adjusting the flow rate of the cold fluid of the plate heat exchanger. When the outlet temperature of the hot fluid of the plate heat exchanger cannot be adjusted to the preset target outlet temperature, the flow rate of the cold fluid of the plate heat exchanger is adjusted to obtain the adjusted outlet temperature of the hot fluid of the plate heat exchanger. Regulation accuracy analysis module: used to calculate the temperature regulation accuracy index of the plate heat exchanger based on the outlet temperature of the hot fluid of the plate heat exchanger after regulation, judge whether the temperature regulation of the plate heat exchanger is qualified, and then issue an early warning; Cleanliness analysis module: used to collect the propagation time and reflected wave intensity of the ultrasonic wave at each monitoring point of the plate heat exchanger, analyze the cleanliness index of the plate heat exchanger, determine whether the cleanliness of the plate heat exchanger is qualified, and then issue an early warning; Plate heat exchanger quality judgment module: used to analyze the quality index of the plate heat exchanger based on the temperature adjustment accuracy index and cleanliness index of the plate heat exchanger, and then judge whether the quality of the plate heat exchanger is qualified, and then issue an early warning; Database: used to store the heat transfer coefficient of the plate heat exchanger, the specific heat capacity of the hot fluid and the cold fluid of the plate heat exchanger, the density of the cold fluid of the plate heat exchanger, and the inner diameter of the cold fluid channel of the plate heat exchanger.

2. The plate heat exchanger based on the Internet of Things according to claim 1, characterized in that: The specific process of determining whether to adjust the inlet temperature of the hot fluid of the plate heat exchanger is as follows: The inlet temperature of the hot fluid of the plate heat exchanger is compared with the preset inlet temperature of the hot fluid. If the inlet temperature of the hot fluid of the plate heat exchanger is greater than or less than the preset inlet temperature of the hot fluid, the inlet temperature of the hot fluid of the plate heat exchanger is temperature-regulated.

3. The plate heat exchanger based on the Internet of Things according to claim 1, characterized in that: The specific process of judging whether there is a margin in the mass flow rate and flow rate of the cold fluid of the plate heat exchanger is as follows: The mass flow rate of the cold fluid of the plate heat exchanger is compared with a preset mass flow rate threshold of the cold fluid. If the mass flow rate of the cold fluid of the plate heat exchanger is less than the preset mass flow rate threshold of the cold fluid, then there is a margin in the mass flow rate of the cold fluid of the plate heat exchanger. The flow rate of the cold fluid of the plate heat exchanger is compared with a preset flow rate threshold of the cold fluid. If the flow rate of the cold fluid of the plate heat exchanger is less than the preset flow rate threshold of the cold fluid, there is a margin in the flow rate of the cold fluid of the plate heat exchanger.

4. The plate heat exchanger based on the Internet of Things according to claim 1, characterized in that: The specific process of determining whether the inlet temperature of the hot fluid can be adjusted to the preset target outlet temperature by adjusting the flow rate of the cold fluid of the plate heat exchanger is as follows: The mass flow rates of the hot and cold fluids in the plate heat exchanger are recorded as and , extract the heat transfer coefficient of the plate heat exchanger, the specific heat capacity of the hot fluid and the specific heat capacity of the cold fluid from the database; The difference between the inlet temperature of the hot fluid of the plate heat exchanger and the preset target outlet temperature of the hot fluid is obtained by subtracting the preset target outlet temperature of the hot fluid from the inlet temperature of the hot fluid of the plate heat exchanger, which is recorded as ; The preset target outlet temperature of the cold fluid is subtracted from the inlet temperature of the cold fluid of the plate heat exchanger to obtain the difference between the preset target outlet temperature of the cold fluid and the inlet temperature of the cold fluid of the plate heat exchanger, which is recorded as ; Calculate the target mass flow rate of the cold fluid in the plate heat exchanger , ,in represents the heat load of the hot fluid in the plate heat exchanger, , represents the specific heat capacity of the hot fluid in the plate heat exchanger, Indicates the specific heat capacity of the cold fluid in the plate heat exchanger; The target mass flow rate of the cold fluid of the plate heat exchanger is compared with the preset maximum mass flow rate of the cold fluid. If the target mass flow rate of the cold fluid of the plate heat exchanger is less than the preset maximum mass flow rate of the cold fluid, the inlet temperature of the hot fluid can be adjusted to the preset target outlet temperature by adjusting the flow rate of the cold fluid of the plate heat exchanger; if the target mass flow rate of the cold fluid of the plate heat exchanger is greater than or equal to the preset maximum mass flow rate of the cold fluid, the flow rate of the cold fluid of the plate heat exchanger is adjusted.

5. The plate heat exchanger based on the Internet of Things according to claim 4, characterized in that: The step of obtaining the adjusted outlet temperature of the hot fluid of the plate heat exchanger comprises: The density of the cold fluid and the inner diameter of the cold fluid channel of the plate heat exchanger are extracted from the database and recorded as and ; Analyze the target flow rate of the cold fluid in a plate heat exchanger , ,in represents the cross-sectional area of ​​the cold fluid channel of the plate heat exchanger, ; After adjusting the flow rate of the cold fluid of the plate heat exchanger to the target flow rate, the outlet temperature of the hot fluid of the plate heat exchanger after adjustment is obtained and recorded as .

6. The plate heat exchanger based on the Internet of Things according to claim 5, characterized in that: The step of judging whether the temperature regulation of the plate heat exchanger is qualified comprises: Statistical Temperature Regulation Accuracy Index of Plate Heat Exchangers , ,in represents the target outlet temperature of the hot fluid of the set plate heat exchanger; The temperature regulation accuracy index of the plate heat exchanger is compared with a preset temperature regulation accuracy threshold. If the temperature regulation accuracy index of the plate heat exchanger is greater than the preset temperature regulation accuracy threshold, the temperature regulation of the plate heat exchanger is qualified.

7. The plate heat exchanger based on the Internet of Things according to claim 1, characterized in that: The method of judging whether the cleanliness of the plate heat exchanger is qualified includes: The ultrasonic sensor is used to collect the propagation time and reflected wave intensity of the ultrasonic wave at each monitoring point of the plate heat exchanger, which are recorded as and ,in Indicates The number corresponding to each monitoring point, ; The plate material of the plate heat exchanger is obtained through the label, and the standard propagation time and standard reflection wave intensity of the ultrasonic wave of each plate material of the plate heat exchanger are extracted from the database, and the standard propagation time and standard reflection wave intensity of the ultrasonic wave of the plate heat exchanger are screened out and recorded as and ; Analyzing the cleanliness index of plate heat exchangers , ,in Indicates the plate heat exchanger The relative intensity index of the reflected wave at each monitoring point, , Represents the relative intensity index of the allowable reflected wave of the plate heat exchanger. and They represent the weight factors corresponding to the propagation time deviation value and the relative intensity index deviation value of the reflected wave of the plate heat exchanger, .

8. The plate heat exchanger based on the Internet of Things according to claim 1, characterized in that: The method of judging whether the cleanliness of the plate heat exchanger is qualified includes: The cleanliness index of the plate heat exchanger is compared with a preset cleanliness threshold. If the cleanliness index of the plate heat exchanger is greater than the preset cleanliness threshold, the cleanliness of the plate heat exchanger is qualified.

9. The plate heat exchanger based on the Internet of Things according to claim 1, characterized in that: The specific calculation formula for analyzing the quality index of the plate heat exchanger is: ,in and They represent the weight factors corresponding to the cleanliness index and temperature regulation accuracy index of the plate heat exchanger, respectively, and .

10. The plate heat exchanger based on the Internet of Things according to claim 1, characterized in that: The method of judging whether the quality of the plate heat exchanger is qualified includes: The quality qualification index of the plate heat exchanger is compared with a preset quality qualification index threshold. If the quality qualification index threshold of the plate heat exchanger is greater than the preset quality qualification index threshold, the quality of the plate heat exchanger is qualified.

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