CN211575977U - System for monitoring fouling coefficient of plate heat exchanger in real time - Google Patents
System for monitoring fouling coefficient of plate heat exchanger in real time Download PDFInfo
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- CN211575977U CN211575977U CN201922410750.7U CN201922410750U CN211575977U CN 211575977 U CN211575977 U CN 211575977U CN 201922410750 U CN201922410750 U CN 201922410750U CN 211575977 U CN211575977 U CN 211575977U
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Abstract
The utility model relates to a system for real-time supervision plate heat exchanger dirt coefficient, this system includes sensor module, the treater, the server, alarm and accumulator, sensor module acquires the plate heat exchanger cold side, the temperature that the hot side was imported and exported, pressure, and acquire the mass flow data of hot side cold side, the treater is arranged in data acquisition dirt coefficient according to sensor data and accumulator, this system handles the data of sensor module and accumulator, finally acquire the dirt coefficient according to the heat transfer coefficient formula, judge whether need wash and report to the police according to dirt coefficient size. Compared with the prior art, the utility model discloses have and can accurately acquire plate heat exchanger dirt coefficient and report to the police, improve the security of system and practice thrift manpower financial resources, utilize pressure differential ratio to carry out first judgement reunion temperature, pressure, mass flow and confirm the scale deposit coefficient, double-deck protection and judgement ensure the accuracy and the security of system.
Description
Technical Field
The utility model relates to a system for real-time supervision dirt coefficient especially relates to a system for real-time supervision plate heat exchanger dirt coefficient.
Background
At present, a large-scale energy center has many projects, the energy center and each independent monomer are separated by a plate heat exchanger, respective functional areas and core equipment for protecting the energy center are distinguished, and the heat exchange efficiency is improved really by adopting the plate heat exchanger, but because the passage is smaller and is generally about 3mm in the structure of the plate heat exchanger, the plate heat exchanger is easy to scale and block after being used for a long time, the heat exchange efficiency and the effect of the plate heat exchanger are easily reduced, the energy consumption is increased, and the comfort of an air conditioner is also reduced; and the plate heat exchanger at the energy center is generally large in specification, troublesome in disassembly and assembly and difficult to disassemble and assemble. How to timely find the scaling blockage of the plate heat exchanger and inform professionals of cleaning the plate heat exchanger is an urgent need in the current market.
Wherein, the dirt coefficient is one of the important data that whether scale deposit blockked up and the jam degree is judged to plate heat exchanger, in the plate heat exchanger equipment of current, can not accurately acquire the dirt coefficient, just also be difficult to judge the structure jam, only can directly look over through dismantling plate heat exchanger and have or not the scale deposit, this just leads to the cost of labor increase, dismantles repeatedly and also can cause the equipment loss.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a system for real-time supervision plate heat exchanger dirt coefficient in order to overcome the defect that above-mentioned prior art exists.
The purpose of the utility model can be realized through the following technical scheme:
a system for monitoring dirt coefficient of a plate heat exchanger in real time comprises a cold side inlet, a cold side outlet, a hot side inlet and a hot side outlet, wherein the system comprises a sensor assembly, a processor used for calculating the dirt coefficient according to data acquired by the sensor, a server used for storing and transmitting processor data and an alarm used for prompting that the plate heat exchanger needs to be cleaned, the sensor assembly comprises a first sensor assembly used for detecting temperature, mass flow rate and pressure of the cold side inlet, a second sensor assembly used for detecting temperature and pressure of the cold side outlet, a third sensor assembly used for detecting temperature, mass flow rate and pressure of the hot side inlet and a fourth sensor assembly used for detecting temperature and pressure of the hot side outlet of the heat exchanger, the first sensor assembly is arranged in a pipeline of the cold side inlet, the second sensor assembly is arranged in a pipeline of the cold side outlet, the third sensor assembly is arranged in the pipeline at the inlet of the hot side, the fourth sensor assembly is arranged in the pipeline at the outlet of the hot side, the first sensor assembly, the second sensor assembly, the third sensor assembly and the fourth sensor assembly are connected with the processor, and the processor and the alarm are connected with the server. When the processor is used, the processor controls the alarm to give an alarm through the server when the processor judges that the fouling coefficient of the plate heat exchanger is too high.
Preferably, the system further comprises a memory storing a table for obtaining density, viscosity, prandtl number, thermal conductivity, and specific heat capacity of the water based on the temperature of the water, the memory being coupled to the processor.
Preferably, the first sensor assembly includes a first temperature sensor for measuring a cold side inlet temperature, a first flow sensor for measuring a cold side inlet mass flow rate, and a first pressure sensor for measuring a cold side inlet pressure, the second sensor assembly includes a second temperature sensor for measuring a cold side outlet temperature, and a second pressure sensor for measuring a cold side outlet pressure, the third sensor assembly includes a third temperature sensor for measuring a hot side inlet temperature, a second flow sensor for measuring a hot side inlet mass flow rate, and a third pressure sensor for measuring a hot side inlet pressure, and the fourth sensor assembly includes a fourth temperature sensor for measuring a hot side outlet temperature, and a fourth pressure sensor for measuring a hot side outlet pressure.
Preferably, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are all plug-in temperature sensors. The plug-in temperature sensor can be better replaced and maintained.
Preferably, the first flow sensor and the second flow sensor are both flange type ultrasonic flow sensors.
Preferably, the first sensor assembly, the second sensor assembly, the third sensor assembly and the fourth sensor assembly are wireless sensor assemblies, the system further comprises a wireless connector, the first sensor assembly, the second sensor assembly, the third sensor assembly and the fourth sensor assembly are connected with the wireless connector, and the wireless connector is connected with the processor. When the device is used, the sensors transmit data to the processor through the wireless connector in a wireless transmission mode.
Preferably, the pipelines of the cold side inlet, the cold side outlet, the hot side inlet and the hot side outlet are internally provided with butterfly valves, the butterfly valves are electric butterfly valves, and the butterfly valves are connected with the processor. The processor can control the butterfly valve to open and close the pipeline.
Preferably, the system further comprises a smart phone for prompting that the plate heat exchanger needs to be cleaned, and the output end of the server is connected with the input end of the smart phone.
Compared with the prior art, the utility model has the advantages of as follows:
(1) the system for monitoring the fouling coefficient of the plate heat exchanger in real time can effectively monitor the data such as temperature, pressure, flow and the like in the plate heat exchanger, acquire the fouling coefficient of the plate heat exchanger according to the data, judge whether the plate heat exchanger needs to be cleaned or not, ensure the safe and normal operation of equipment, ensure that the plate heat exchanger is cleaned after the fouling reaches a certain degree, and avoid the waste of manpower and financial resources;
(2) the system for monitoring the fouling coefficient of the plate heat exchanger in real time utilizes the wireless sensor and the wireless connector to acquire the temperature, the pressure and the mass flow in the plate heat exchanger, reduces the influence of wired equipment on the complexity of a field cable, reduces the maintenance difficulty and improves the safety of the equipment field;
(3) the system for monitoring the fouling coefficient of the plate heat exchanger in real time adopts the plug-in temperature sensor, so that the replacement and the maintenance can be better carried out;
(4) the utility model discloses a system for real-time supervision plate heat exchanger dirt coefficient utilizes the treater to carry out the too high warning of dirt coefficient through server control alarm and mobile phone, the security of assurance system that can be better.
Drawings
Fig. 1 is a schematic structural diagram of a system for monitoring the fouling coefficient of a plate heat exchanger in real time according to the present invention;
fig. 2 is the utility model relates to a flow chart of system of real-time supervision plate heat exchanger dirt coefficient.
Wherein, 1, cold side import, 2, cold side export, 3, hot side import, 4, hot side export, 5, first temperature sensor, 6, first flow sensor, 7, first pressure sensor, 8, second temperature sensor, 9, second pressure sensor, 10, third pressure sensor, 11, second flow sensor, 12, third temperature sensor, 13, fourth pressure sensor, 14, fourth temperature sensor, 15, treater, 16, server, 17, alarm, 18, smart mobile phone, 19, butterfly valve, 20, plate heat exchanger, 21, storage, 22, wireless connector.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Note that the following description of the embodiments is merely an example of the nature, and the present invention is not intended to limit the application or the use thereof, and the present invention is not limited to the following embodiments.
Examples
As shown in fig. 1, a system for monitoring fouling coefficients of a plate heat exchanger in real time, a plate heat exchanger 20 includes a cold side inlet 1, a cold side outlet 2, a hot side inlet 3 and a hot side outlet 4, butterfly valves 19 are respectively disposed in pipes of the cold side inlet 1, the cold side outlet 2, the hot side inlet 3 and the hot side outlet 4, the butterfly valves 19 are electric butterfly valves, the butterfly valves 19 are connected with a processor 15, the system further includes a first sensor component, a second sensor component, a third sensor component, a fourth sensor component, a processor 15, a server 16, an alarm 17, a smart phone and a storage 21, the first sensor component, the second sensor component, the third sensor component, the fourth sensor component, the server 16 and the storage 21 are respectively connected with the processor, and an output end of the server 16 is connected with the alarm 17 and an input end of the smart phone 18.
Wherein, the first sensor assembly is arranged in the pipeline of the cold side inlet 1, the first sensor assembly comprises a first temperature sensor 5 for measuring the temperature of the cold side inlet 1, a first flow sensor 6 for measuring the mass flow rate of the cold side inlet 1 and a first pressure sensor 7 for measuring the pressure of the cold side inlet 1, the second sensor assembly is arranged in the pipeline of the cold side outlet 2, the second sensor assembly comprises a second temperature sensor 8 for measuring the temperature of the cold side outlet 2 and a second pressure sensor 9 for measuring the pressure of the cold side outlet 2, the third sensor assembly is arranged in the pipeline of the hot side inlet 3, the third sensor assembly comprises a third temperature sensor 12 for measuring the temperature of the hot side inlet 3, a second flow sensor 11 for measuring the mass flow rate of the hot side inlet 3 and a third pressure sensor 10 for measuring the pressure of the hot side inlet 3, a fourth sensor assembly is provided in the duct of the hot side outlet 4, the fourth sensor assembly comprising a fourth temperature sensor 14 for measuring the temperature of the hot side outlet 4 and a fourth pressure sensor 13 for measuring the pressure at the hot side outlet 4.
Specifically, the first temperature sensor 5, the second temperature sensor 8, the third temperature sensor 12, and the fourth temperature sensor 14 are all plug-in temperature sensors, the first flow sensor 6 and the second flow sensor 11 are all flange-type ultrasonic flow sensors, the first temperature sensor 5, the second temperature sensor 8, the third temperature sensor 12, the fourth temperature sensor 14, the first pressure sensor 7, the second pressure sensor 9, the third pressure sensor 10, the fourth pressure sensor 13, the first flow sensor 6, and the second flow sensor 11 are all wireless sensors, the system further includes a wireless connector, the first temperature sensor 5, the second temperature sensor 8, the third temperature sensor 12, the fourth temperature sensor 14, the first pressure sensor 7, the second pressure sensor 9, the third pressure sensor 10, and the fourth pressure sensor 13, The first flow sensor 6 and the second flow sensor 11 are connected to a wireless connector, which is connected to the processor 15.
The processor 15 is used for calculating a dirt coefficient according to data acquired by the sensor, the server 16 is used for storing and transmitting data of the processor 15, the alarm 17 is used for prompting that the plate heat exchanger 20 needs to be cleaned by dirt, and the storage 21 is used for storing a table for acquiring density, viscosity, Prandtl number, heat conductivity coefficient and specific heat capacity of water according to the temperature of the water.
As shown in fig. 2, the specific working steps of the system include:
s1: acquiring the number of hot side plates, the number of cold side plates, the plate thickness, the single-channel sectional area, the characteristic length, the set hot side pressure difference and the set cold side pressure difference of the plate heat exchanger, and storing the obtained values in a storage 21;
s2: the sensor assembly obtains a cold side inlet 1 temperature, a cold side outlet 2 temperature, a hot side inlet 3 temperature, a hot side outlet 4 temperature, a cold side inlet 1 pressure, a cold side outlet 2 pressure, a hot side inlet 3 pressure, a hot side outlet 4 pressure, a hot side mass flow rate, and a cold side mass flow rate, and stores them in the memory 21;
s3: the processor 15 obtains a cold-side average temperature according to the cold-side inlet 1 temperature and the cold-side outlet 2 temperature, and stores the cold-side average temperature in the storage 21, and obtains a hot-side average temperature according to the hot-side inlet 3 temperature and the hot-side outlet 4 temperature, and stores the hot-side average temperature in the storage 21, specifically, in this embodiment, the formula of the cold-side average temperature is:
the hot side average temperature is given by:
wherein, THIs the hot side average temperature, ThIs the cold side average temperature, T1The temperature of the hot side inlet 3, T2Temperature of the hot side outlet 4, t1Cold side inlet temperature, t2 Cold side outlet 2 temperature;
s4: the processor 15 obtains a cold side pressure difference according to the pressure at the cold side inlet 1 and the pressure at the cold side outlet 2, obtains a cold side pressure difference ratio according to the cold side pressure difference and a set cold side pressure difference, obtains a hot side pressure difference according to the pressure at the hot side inlet 3 and the pressure at the hot side outlet 4, obtains a hot side pressure difference ratio according to the hot side pressure difference and the set hot side pressure difference, judges whether the cold side pressure difference ratio or the hot side pressure difference ratio is larger than the set pressure difference ratio, if so, the S3 is carried out, otherwise, the S1 is;
step S4 is to make an initial determination on the fouling coefficient by using the hot side pressure difference ratio and the cold side pressure difference ratio, and if the cold side pressure difference or the hot side pressure difference is too large, the plate heat exchanger 20 may be fouled, and then the subsequent calculation of the specific fouling coefficient is performed.
S5: the processor 15 obtains the hot-side density from the storage 21 according to the hot-side average temperature, obtains the hot-side flow rate according to the hot-side density, the hot-side mass flow rate, the number of hot-side plates, and the single-channel cross-sectional area, obtains the cold-side density from the storage 21 according to the cold-side average, and obtains the cold-side flow rate according to the cold-side density, the cold-side mass flow rate, the number of cold-side plates, and the single-channel cross-sectional area, specifically in this embodiment, the:
wherein u isHIs the hot side flow rate, omegaHIs the hot side mass flow rate, pHIs the hot side density, nHThe number of the hot side plates is, f is the sectional area of a single channel,
the equation for the cold side flow rate is:
wherein u ishIs coldSide flow velocity, omegahCold side mass flow rate, ρhDensity of cold side water, nhNumber of cold side plates;
s6: the processor 15 obtains a hot-side viscosity from the storage 21 according to the hot-side average temperature, and obtains a hot-side reynolds number according to the hot-side viscosity, the characteristic length, and the hot-side flow rate, and the processor 15 obtains a cold-side viscosity from the storage 21 according to the cold-side average temperature, and obtains a cold-side reynolds number according to the cold-side viscosity, the characteristic length, and the cold-side flow rate, specifically in this embodiment, the formula of the hot-side reynolds number is:
wherein, ReHIs the hot side Reynolds number, vHIs the hot side viscosity, L is the characteristic length,
the equation for the cold side reynolds number is:
wherein, RehReynolds number of cold side, uhAt cold side flow rate, vhCold side viscosity;
s7: the processor 15 obtains a hot-side prandtl number from the storage 21 according to the hot-side average temperature, obtains a hot-side knoop-sel number according to the hot-side reynolds number and the hot-side prandtl number, and the processor 15 obtains a cold-side prandtl number from the storage 21 according to the cold-side average temperature, and obtains a cold-side knoop-sel number according to the cold-side reynolds number and the cold-side prandtl number, specifically, in this embodiment, the formula of the hot-side knoop-sel number is:
wherein N isuHNumber of Knoop at the hot side, PrHIs the number of prandtl at the hot side,
the formula for the cold side knossel number is:
wherein, PrhCold side prandtl;
s8: the processor 15 obtains a hot-side heat conductivity coefficient from the storage 21 according to the hot-side average temperature, obtains a hot-side heat transfer coefficient according to the hot-side heat conductivity coefficient, the characteristic length, and the hot-side knossel number, and the processor 15 obtains a cold-side heat conductivity coefficient from the storage 21 according to the cold-side average temperature, and obtains a cold-side heat transfer coefficient according to the cold-side heat conductivity coefficient, the characteristic length, and the cold-side knossel number, specifically in this embodiment, the formula of the hot-side heat transfer coefficient is:
wherein H is the heat transfer coefficient of hot side, lambdaHThe thermal conductivity of the hot side,
wherein h is the cold side heat transfer coefficient, lambdahCold side thermal conductivity;
s9: obtaining a logarithmic temperature difference according to the temperature of the cold side inlet 1, the temperature of the cold side outlet 2, the temperature of the hot side inlet 3 and the temperature of the hot side outlet 4, specifically, in this embodiment, the formula of the logarithmic temperature difference is:
T1-t2＝T2-t1
wherein, Δ tmIs a logarithmic temperature difference;
s10: obtain the heat transfer difference in temperature according to cold side import 1 temperature and cold side export 2 temperatures, obtain fluid flow according to cold side mass flow, obtain cold side specific heat capacity according to cold side import 1 temperature, obtain the heat transfer volume according to heat transfer difference in temperature, fluid flow and cold side specific heat capacity, the formula of heat transfer volume is:
Q＝cmΔt，
wherein Q is heat exchange capacity, c is specific heat capacity, m is fluid flow, and delta t is heat exchange temperature difference;
s11: the heat transfer coefficient is obtained according to the heat exchange amount, the heat exchange area and the heat exchange amount, and specifically in this embodiment, the formula of the heat transfer coefficient is as follows:
wherein K is a heat transfer coefficient, and A is a heat exchange area;
s12: obtaining a fouling coefficient according to the heat transfer coefficient, the heat side heat transfer coefficient, the cold side heat transfer coefficient, the plate thickness and the heat transfer thermal resistance of the heat exchanger, judging whether the fouling coefficient is larger than a set value, if the fouling coefficient is larger than the set value, controlling an alarm to give an alarm by the processor 15, otherwise, returning to the step S1, specifically, in the embodiment, substituting data into a formula of the heat transfer coefficient to obtain the fouling coefficient:
wherein is the sheet thickness, λ0Heat transfer resistance of the heat exchanger and fouling coefficient.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (8)
1. A system for monitoring the fouling coefficient of a plate heat exchanger in real time, wherein the plate heat exchanger (20) comprises a cold side inlet (1), a cold side outlet (2), a hot side inlet (3) and a hot side outlet (4), and is characterized by comprising sensor components, a processor (15) for calculating the fouling coefficient according to data acquired by the sensors, a server (16) for storing and transmitting data of the processor (15) and an alarm (17) for prompting that the plate heat exchanger (20) needs to be cleaned of fouling, wherein the sensor components comprise a first sensor component for detecting the temperature, the mass flow rate and the pressure of the cold side inlet (1), a second sensor component for detecting the temperature and the pressure of the cold side outlet (2), a third sensor component for detecting the temperature, the mass flow rate and the pressure of the hot side inlet (3) and a fourth sensor component for detecting the temperature and the pressure of the heat exchanger outlet (4), the first sensor assembly is arranged in a pipeline of the cold side inlet (1), the second sensor assembly is arranged in a pipeline of the cold side outlet (2), the third sensor assembly is arranged in a pipeline of the hot side inlet (3), the fourth sensor assembly is arranged in a pipeline of the hot side outlet (4), the first sensor assembly, the second sensor assembly, the third sensor assembly and the fourth sensor assembly are connected with the processor (15), and the processor (15) and the alarm (17) are connected with the server (16).
2. A system for real-time monitoring of fouling factor of a plate heat exchanger according to claim 1, characterized in that the system further comprises a memory (21) storing a table of density, viscosity, prandtl number, thermal conductivity and specific heat capacity of the water obtained from the temperature of the water, said memory (21) being connected to the processor (15).
3. A system for real-time monitoring of fouling factor of a plate heat exchanger according to claim 1, characterized in that the first sensor assembly comprises a first temperature sensor (5) for measuring the temperature of the cold side inlet (1), a first flow sensor (6) for measuring the mass flow rate of the cold side inlet (1) and a first pressure sensor (7) for measuring the pressure at the cold side inlet (1), the second sensor assembly comprises a second temperature sensor (8) for measuring the temperature at the cold side outlet (2) and a second pressure sensor (9) for measuring the pressure at the cold side outlet (2), the third sensor assembly comprises a third temperature sensor (12) for measuring the temperature at the hot side inlet (3), a second flow sensor (11) for measuring the mass flow rate at the hot side inlet (3) and a third pressure sensor (10) for measuring the pressure at the hot side inlet (3), the fourth sensor assembly comprises a fourth temperature sensor (14) for measuring the temperature of the hot side outlet (4) and a fourth pressure sensor (13) for measuring the pressure of the hot side outlet (4).
4. A system for real-time monitoring of fouling coefficients of plate heat exchangers according to claim 3, 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 plug-in temperature sensors.
5. A system for real-time monitoring of fouling factors of plate heat exchangers according to claim 3, characterized in that the first flow sensor (6) and the second flow sensor (11) are both flange-type ultrasonic flow sensors.
6. The system for real-time monitoring of fouling factor of a plate heat exchanger according to claim 1, wherein the first, second, third and fourth sensor assemblies are all wireless sensor assemblies, the system further comprises a wireless connector (22), the first, second, third and fourth sensor assemblies are connected to the wireless connector (22), and the wireless connector (22) is connected to the processor (15).
7. The system for monitoring the fouling coefficient of a plate heat exchanger in real time according to claim 1, wherein butterfly valves (19) are arranged in the pipelines of the cold side inlet (1), the cold side outlet (2), the hot side inlet (3) and the hot side outlet (4), the butterfly valves (19) are electric butterfly valves, and the butterfly valves (19) are connected with the processor (15).
8. The system for monitoring the fouling coefficient of a plate heat exchanger in real time according to claim 1, further comprising a smart phone (18) for prompting that the plate heat exchanger (20) needs to be cleaned, wherein an output end of the server (16) is connected with an input end of the smart phone (18).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654184A (en) * | 2021-08-23 | 2021-11-16 | 珠海格力电器股份有限公司 | Control method for preventing water side of air conditioner plate type heat exchanger from being blocked and air conditioner |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654184A (en) * | 2021-08-23 | 2021-11-16 | 珠海格力电器股份有限公司 | Control method for preventing water side of air conditioner plate type heat exchanger from being blocked and air conditioner |
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