Digital judgment system for scale cleaning of plate heat exchanger

Abstract

The utility model discloses a digital judgment system for scale cleaning of a plate heat exchanger, and relates to the technical field of heat exchange station equipment of a heat supply system. Comprising a sensor group, a database (17), an alarm (15) and an online processor (16), the sensor group is connected with a first communication port of the online processor (16); the alarm (15) is connected with a second communication port of the online processor (16); and the database (17) is connected with a third communication port of the online processor (16). According to the utility model, performance indexes of different angles are constructed to measure the scaling condition of the plate heat exchanger, and the scaling condition in the heat exchanger can be found comprehensively, accurately and timely.

Description

Technical Field

[0001] This utility model relates to the technical field of heat exchange station equipment in heating systems, and in particular to a digital judgment system for scaling and cleaning of plate heat exchangers. Background Technology

[0002] Heat exchange stations serve as the connecting hub between primary and secondary heating networks in a heating system. Plate heat exchangers, as the main equipment in these stations, play a crucial role in achieving heat exchange and improving heating quality. However, during long-term heat exchange, calcium and magnesium ions from the hot water on both sides precipitate and adhere to the internal plates, forming scale. This scale accumulation not only significantly reduces the heat transfer efficiency of the heat exchanger and weakens its overall performance but also increases the system's flow resistance. Consequently, while maintaining the same heat exchange capacity, the energy consumption of the water pump increases significantly, resulting in energy waste.

[0003] Existing technologies for assessing scale buildup in heat exchangers mostly rely on passive maintenance methods that require periodic disassembly of the heat exchanger to check for scale deposits. These methods have several drawbacks: they involve cumbersome disassembly and high maintenance costs; they also require the suspension of the heating system, which disrupts heating services; furthermore, these technologies cannot determine the specific extent of scale buildup, often resulting in the heat exchanger not being cleaned in a timely manner, leading to energy waste and economic losses.

[0004] Therefore, proposing a digital judgment system for scaling and cleaning of plate heat exchangers to solve the difficulties existing in the prior art is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a digital judgment system for scaling and cleaning of plate heat exchangers, which can comprehensively, accurately and timely detect the scaling inside the heat exchanger and realize digital judgment of scaling and cleaning of plate heat exchangers.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A digital judgment system for scaling and cleaning of plate heat exchangers includes: a sensor group, a database, an alarm, and an online processor; the sensor group is connected to a first communication port of the online processor; the alarm is connected to a second communication port of the online processor; and the database is connected to a third communication port of the online processor.

[0008] The above system may optionally include a sensor group comprising a temperature sensor unit, a flow sensor unit, and a pressure sensor unit.

[0009] Optionally, the temperature sensor unit of the above system includes: a first temperature sensor installed on the pipe at the cold water inlet of the plate heat exchanger; a second temperature sensor installed on the pipe at the cold water outlet of the plate heat exchanger; a third temperature sensor installed on the pipe at the hot water inlet of the plate heat exchanger; and a fourth temperature sensor installed on the pipe at the hot water outlet of the plate heat exchanger.

[0010] In the above system, optionally, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are all thermocouple thermometers.

[0011] In the above system, optionally, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are all arranged at a distance of more than three times the diameter of the plate heat exchanger.

[0012] Optionally, the flow sensor unit of the above system includes: a first flow sensor installed on the pipe at the cold water inlet of the plate heat exchanger; and a second flow sensor installed on the pipe at the hot water inlet of the plate heat exchanger.

[0013] In the above system, optionally, both the first flow sensor and the second flow sensor are flange-type ultrasonic flow sensors.

[0014] Optionally, the pressure sensor unit of the above system includes: a first pressure sensor installed on the pipe at the cold water inlet of the plate heat exchanger; a second pressure sensor installed on the pipe at the cold water outlet of the plate heat exchanger; a third pressure sensor installed on the pipe at the hot water inlet of the plate heat exchanger; and a fourth pressure sensor installed on the pipe at the hot water outlet of the plate heat exchanger.

[0015] As can be seen from the above technical solution, compared with the prior art, this utility model provides a digital judgment system for plate heat exchanger scaling and cleaning, which has the following beneficial effects: 1) Based on real-time monitoring of operating data, this utility model does not rely on manual experience and regular cleaning and maintenance methods, and effectively monitors in real time whether the plate heat exchanger needs cleaning, ensuring the efficient and stable operation of the heat exchanger; 2) By using performance indicators from different perspectives to measure the scaling condition of the plate heat exchanger, the scaling condition inside the heat exchanger can be detected comprehensively, accurately and timely; 3) It is simple and reliable to implement, suitable for newly built heat exchange stations, and the online processor can send the status of the plate heat exchanger to the alarm in a timely manner through wireless connection, which can better ensure the safety of the system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a structural diagram of a digital judgment system for scaling and cleaning of plate heat exchangers disclosed in this utility model;

[0018] Explanation of reference numerals in the attached figures:

[0019] 1 is the cold water inlet; 2 is the cold water outlet; 3 is the hot water inlet; 4 is the hot water outlet; 5 is the first temperature sensor; 6 is the first flow sensor; 7 is the first pressure sensor; 8 is the second temperature sensor; 9 is the second pressure sensor; 10 is the third pressure sensor; 11 is the second flow sensor; 12 is the third temperature sensor; 13 is the fourth pressure sensor; 14 is the fourth temperature sensor; 15 is the alarm; 16 is the online processor; 17 is the database; 18 is the plate heat exchanger. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0022] Reference Figure 1 As shown, this utility model discloses a digital judgment system for scaling and cleaning of plate heat exchangers, including: a sensor group, a database 17, an alarm 15, and an online processor 16;

[0023] The sensor group is connected to the first communication port of the online processor 16 to acquire the heating parameters of the plate heat exchanger 18 in real time and transmit the heating parameters to the online processor 16.

[0024] The online processor 16 is used to calculate the scaling index using the received heating parameters, determine whether the plate heat exchanger 18 needs scaling cleaning, and send the determination result to the alarm 15.

[0025] Alarm 15, connected to the second communication port of online processor 16, is used to alert the heat exchanger that it needs to be cleaned of scale.

[0026] Database 17, connected to the third communication port of online processor 16, is used to store industrial parameters sent by online processor 16, as well as judgment results.

[0027] Furthermore, the sensor group includes: a temperature sensor unit, a flow sensor unit, and a pressure sensor unit.

[0028] Furthermore, the temperature sensor unit includes:

[0029] The first temperature sensor 5 is installed on the pipe of the cold water inlet 1 of the plate heat exchanger 18 and is used to measure the temperature at the cold water inlet 1.

[0030] The second temperature sensor 8 is installed on the pipe of the cold water outlet 2 of the plate heat exchanger 18 and is used to measure the temperature at the hot water outlet 4.

[0031] The third temperature sensor 12 is installed on the pipe of the hot water inlet 3 of the plate heat exchanger 18 and is used to measure the temperature at the hot water inlet 3.

[0032] The fourth temperature sensor 14 is installed on the pipe of the hot water outlet 4 of the plate heat exchanger 18 and is used to measure the temperature at the cold water outlet 2.

[0033] Furthermore, the first temperature sensor 5, the second temperature sensor 8, the third temperature sensor 12, and the fourth temperature sensor 14 are all thermocouple thermometers with a temperature measurement range of -50℃ to 200℃. The thermocouple temperature sensors can be replaced and maintained more easily.

[0034] Furthermore, the first temperature sensor 5, the second temperature sensor 8, the third temperature sensor 12, and the fourth temperature sensor 14 are all arranged at a distance of more than three times the pipe diameter from the heat exchanger. Each connecting main pipe is equipped with at least two temperature sensors and is fastened with clamps. The distance between the temperature sensors is more than twice the pipe diameter.

[0035] Furthermore, the flow sensor unit includes:

[0036] The first flow sensor 6 is installed on the pipe of the cold water inlet 1 of the plate heat exchanger 18 and is used to measure the flow rate at the cold water inlet 1.

[0037] The second flow sensor 11 is installed on the pipe of the hot water inlet 3 of the plate heat exchanger 18 and is used to measure the flow rate at the hot water inlet 3.

[0038] Furthermore, both the first flow sensor 6 and the second flow sensor 11 are flange-type ultrasonic flow sensors.

[0039] Furthermore, the pressure sensor unit includes:

[0040] The first pressure sensor 7 is installed on the pipe of the cold water inlet 1 of the plate heat exchanger 18 and is used to measure the pressure at the cold water inlet 1.

[0041] The second pressure sensor 9 is installed on the pipe of the cold water outlet 2 of the plate heat exchanger 18 and is used to measure the pressure at the cold water outlet 2.

[0042] The third pressure sensor 10 is installed on the pipe of the hot water inlet 3 of the plate heat exchanger 18 and is used to measure the pressure at the hot water inlet 3.

[0043] The fourth pressure sensor 13 is installed on the pipe of the hot water outlet 4 of the plate heat exchanger 18 and is used to measure the pressure at the hot water outlet 4.

[0044] In one specific embodiment, the online processor 16 is used to acquire the real-time operating temperature, pressure, and flow rate of the hot water inlet 3, hot water outlet 4, cold water inlet 1, and cold water outlet 2 of the plate heat exchanger 18, calculate the real-time heat transfer efficiency ε and overall heat transfer coefficient K of the plate heat exchanger 18, and look up the overall heat transfer coefficient K of the plate heat exchanger 18 under the current clean operating conditions based on the performance curve of the plate heat exchanger 18 stored in the database 17. s And calculate the heat exchange efficiency ε under the current clean operating conditions. s The scaling indicators—the percentage change in heat exchange efficiency and the percentage change in total heat transfer coefficient—are compared with a preset upper limit threshold. Based on the comparison results, it is determined whether the plate heat exchanger needs scaling cleaning. Here, the upper limit threshold is set to 20%. If the upper limit threshold is exceeded, the online processor 16 controls the alarm 15 to sound an alarm, outputting a prompt message indicating that the heat exchanger is severely scaled and needs cleaning, and saves the data to the database 17. If the upper limit threshold is not exceeded, the data generated during this operation is saved to the database 17.

[0045] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A digital judgment system for scaling and cleaning of plate heat exchangers, characterized in that, include: Sensor group, database (17), alarm (15) and online processor (16); sensor group is connected to the first communication port of online processor (16); alarm (15) is connected to the second communication port of online processor (16); database (17) is connected to the third communication port of online processor (16); The sensor group includes: a temperature sensor unit, a flow sensor unit, and a pressure sensor unit; The temperature sensor unit includes: The first temperature sensor (5) is installed on the pipe of the cold water inlet (1) of the plate heat exchanger (18); The second temperature sensor (8) is installed on the pipe of the cold water outlet (2) of the plate heat exchanger (18); The third temperature sensor (12) is installed on the pipe of the hot water inlet (3) of the plate heat exchanger (18); The fourth temperature sensor (14) is installed on the pipe of the hot water outlet (4) of the plate heat exchanger (18); The flow sensor unit includes: The first flow sensor (6) is installed on the pipe of the cold water inlet (1) of the plate heat exchanger (18); The second flow sensor (11) is installed on the pipe of the hot water inlet (3) of the plate heat exchanger (18); The pressure sensor unit includes: The first pressure sensor (7) is installed on the pipe of the cold water inlet (1) of the plate heat exchanger (18); The second pressure sensor (9) is installed on the pipe of the cold water outlet (2) of the plate heat exchanger (18); The third pressure sensor (10) is installed on the pipe of the hot water inlet (3) of the plate heat exchanger (18); The fourth pressure sensor (13) is installed on the pipe of the hot water outlet (4) of the plate heat exchanger (18).

2. The digital judgment system for scaling and cleaning of plate heat exchangers according to claim 1, characterized in that, The first temperature sensor (5), the second temperature sensor (8), the third temperature sensor (12), and the fourth temperature sensor (14) are all thermocouple thermometers.

3. The digital judgment system for scaling and cleaning of plate heat exchangers according to claim 1, characterized in that, The first temperature sensor (5), the second temperature sensor (8), the third temperature sensor (12) and the fourth temperature sensor (14) are all located at a distance of more than three times the pipe diameter from the plate heat exchanger (18).

4. The digital judgment system for scaling and cleaning of plate heat exchangers according to claim 1, characterized in that, Both the first flow sensor (6) and the second flow sensor (11) are flange-type ultrasonic flow sensors.

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