CN112665449A - Full-automatic self-cleaning plate type heat exchange device and cleaning control method - Google Patents
Full-automatic self-cleaning plate type heat exchange device and cleaning control method Download PDFInfo
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- CN112665449A CN112665449A CN202011558827.6A CN202011558827A CN112665449A CN 112665449 A CN112665449 A CN 112665449A CN 202011558827 A CN202011558827 A CN 202011558827A CN 112665449 A CN112665449 A CN 112665449A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a full-automatic self-cleaning plate type heat exchange device and a cleaning control method thereof. The invention realizes automatic cleaning under the condition of ensuring no shutdown, has short cleaning time consumption, improves the cleaning efficiency and does not influence the production; the manual operation is not needed, additional cleaning water is not needed, pollution discharge is avoided, and the method is economical and environment-friendly.
Description
Technical Field
The invention belongs to the field of plate type heat exchange equipment, and particularly relates to a full-automatic self-cleaning plate type heat exchange device and a cleaning control method.
Background
In the field of water treatment, in particular to a high-concentration organic wastewater treatment process represented by domestic garbage leachate, a plate heat exchanger is a necessary device for cooling aerobic biochemical mixed liquor due to high heat transfer efficiency and small occupied space. When the plate heat exchanger is used, the heat exchange plates are easy to scale, so that the heat transfer effect is reduced; at the present stage, manual disassembly is mostly adopted for cleaning after the scale of the plate heat exchanger, the production is influenced during the disassembly and cleaning, a large amount of manpower and time are consumed, a large amount of cleaning sewage needs to be collected and treated, and otherwise, the environmental pollution is caused. In the process of disassembly and cleaning, the heat exchange plate and the plate sealing gasket are extremely easy to damage, so that the equipment maintenance cost is increased, and even the production stop for a long time is caused to bring great economic loss.
Accordingly, further developments and improvements are still needed in the art.
Disclosure of Invention
Aiming at the technical defects of the plate type heat exchange device at present, the invention provides a full-automatic self-cleaning plate type heat exchange device and a cleaning control method from the viewpoints of human-oriented property, economy, environmental protection, safety and reliability, realizes automatic cleaning under the condition of ensuring no shutdown, improves the cleaning efficiency and reduces the cleaning time.
In order to achieve the purpose, the invention provides the following technical scheme:
a full-automatic self-cleaning plate type heat exchange device comprises a plate type heat exchanger, a heat medium inlet pipe and a heat medium outlet pipe which are connected with a heat medium channel of the plate type heat exchanger, a refrigerant inlet pipe and a refrigerant outlet pipe which are connected with a refrigerant channel of the plate type heat exchanger, a cleaning agent dosing pipe connected with the refrigerant inlet pipe, a first communicating pipe connected with the refrigerant outlet pipe and the heat medium inlet pipe, and a second communicating pipe connected with the refrigerant outlet pipe and the heat medium outlet pipe, wherein a heat medium delivery pump, a refrigerant delivery pump and a cleaning agent delivery pump are respectively arranged on the heat medium inlet pipe, the refrigerant inlet pipe and the cleaning agent dosing pipe, a first control valve, a second control valve, a third control valve and a fourth control valve are respectively arranged on the heat medium outlet pipe, the refrigerant outlet pipe, the first communicating pipe and the second communicating pipe, one end of the first communicating pipe is connected with the heat medium inlet pipe, and the other end, one end of the second communicating pipe is connected to a heat medium outlet pipe at the liquid inlet end of the first control valve, and the other end of the second communicating pipe is connected to a refrigerant outlet pipe at the liquid outlet end of the second control valve.
Further, full-automatic self-cleaning plate type heat exchange device further comprises a first pressure sensor and a second pressure sensor, the first pressure sensor is used for detecting the pressure value of the inlet end of a heat medium channel of the plate type heat exchanger, the second pressure sensor is used for detecting the pressure value of the inlet end of a refrigerant channel of the plate type heat exchanger, the first pressure sensor is arranged on a heat medium inlet pipe between the heat medium inlet pipe and a joint of the first communication pipe and the plate type heat exchanger, and the second pressure sensor is arranged on a refrigerant inlet pipe between the refrigerant inlet pipe and a joint of a cleaning liquid medicine adding pipe and the plate type.
Further, full-automatic self-cleaning plate type heat exchange device further comprises a first temperature sensor used for detecting the inlet end temperature value of a heat medium channel of the plate type heat exchanger and a second temperature sensor used for detecting the outlet end temperature value of the heat medium channel of the plate type heat exchanger, wherein the first temperature sensor and the first pressure sensor are arranged on the heat medium inlet pipe between the heat medium inlet pipe and the first communicating pipe joint and the plate type heat exchanger in parallel, and the second temperature sensor is arranged on the heat medium outlet pipe between the heat medium outlet pipe and the second communicating pipe joint and the plate type heat exchanger.
Further, still be provided with the pH detector on the refrigerant inlet tube, the pH detector is located between refrigerant inlet tube and cleaner dosing union coupling department and plate heat exchanger.
Further, the full-automatic self-cleaning plate type heat exchange device further comprises an electrical control system, and the electrical control system is respectively connected with the first control valve, the second control valve, the third control valve, the fourth control valve, the heat medium delivery pump, the refrigerant delivery pump, the cleaning agent delivery pump, the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor and the pH detector.
Preferably, be provided with the first check valve that is used for avoiding the interior heat medium of heat medium inlet pipe to flow back, be used for avoiding the cleaner to add the interior second check valve that the cleaner flows back of cleaner on heat medium inlet pipe, the cleaner dosing pipe respectively, first check valve is located the heat medium inlet pipe between heat medium inlet pipe and first connecting pipe junction and the heat medium delivery pump.
Further, full-automatic self-cleaning plate type heat exchange device further comprises a heat medium storage connected to the tail ends of the heat medium inlet pipe and the heat medium outlet pipe, a refrigerant storage connected to the tail ends of the refrigerant inlet pipe and the refrigerant outlet pipe, and a cleaning agent storage connected to the tail ends of the cleaning agent dosing pipe, wherein a liquid inlet end of the heat medium inlet pipe is communicated with a liquid outlet on the heat medium storage, a liquid outlet end of the heat medium outlet pipe is connected with a liquid inlet on the heat medium storage, a liquid inlet end of the refrigerant inlet pipe is connected with a liquid outlet on the refrigerant storage, and a liquid outlet end of the refrigerant outlet pipe is connected with a liquid inlet on the refrigerant.
A cleaning control method of a full-automatic self-cleaning plate type heat exchange device is characterized in that after the heat exchange work of the full-automatic self-cleaning plate type heat exchange device is started, a first pressure sensor detection value and a second pressure sensor detection value are obtained in real time, the first pressure sensor detection value is compared with a heating medium channel cleaning pressure set value, the second pressure sensor detection value is compared with a cooling medium channel cleaning pressure set value, whether a heating medium channel and a cooling medium channel of the plate type heat exchanger are blocked or not is judged according to a comparison result, and the opening and closing of a control valve and a delivery pump on a corresponding pipeline are adjusted according to the judgment result;
and/or the electric control system calculates the difference value between the detection value of the first temperature sensor and the detection value of the second temperature sensor, compares the difference value with a cleaning temperature difference set value, compares the detection value of the first pressure sensor with a cleaning pressure set value of the heat medium channel, judges whether the refrigerant channel and the heat medium channel of the plate heat exchanger are blocked according to the comparison result, and adjusts the opening and closing of a control valve and a delivery pump on the corresponding pipeline according to the judgment result.
Further, when the detection value of the second pressure sensor is greater than or equal to the cleaning pressure set value of the refrigerant channel and the detection value of the first pressure sensor is smaller than the cleaning pressure set value of the heat medium channel and/or the difference value between the detection value of the first temperature sensor and the detection value of the second temperature sensor is smaller than the cleaning temperature difference set value and the first pressure sensor is smaller than the cleaning pressure set value of the heat medium channel, the condition that the refrigerant channel of the plate heat exchanger is scaled and blocked is judged;
when the detection value of the second pressure sensor is greater than or equal to the cleaning pressure set value of the refrigerant channel and the detection value of the first pressure sensor is greater than or equal to the cleaning pressure set value of the heat medium channel and/or when the difference value between the detection value of the first temperature sensor and the detection value of the second temperature sensor is less than the cleaning temperature difference set value and the detection value of the first pressure sensor is greater than or equal to the cleaning pressure set value of the heat medium channel, the situation that both the refrigerant channel and the heat medium channel of the plate heat exchanger are scaled and blocked is judged;
when the condition that the refrigerant channel of the plate heat exchanger is scaled and blocked is judged, starting a cleaning agent delivery pump to clean the refrigerant channel, closing the cleaning agent delivery pump after cleaning for a period of time, and then recovering normal heat exchange work;
when the situation that scaling and blocking exist in both the refrigerant channel and the heat medium channel of the plate heat exchanger is judged, the heat medium delivery pump is closed, the third control valve is opened, the second control valve is closed, the heat medium channel is flushed by the refrigerant, the fourth control valve is opened and the first control valve is closed in sequence after the heat medium channel is flushed for a period of time, the cleaning agent delivery pump is started to clean the refrigerant channel, the second control valve is opened, the third control valve is closed, the first control valve is opened and the fourth control valve is closed in sequence after the cleaning is performed for a period of time, and then the heat medium delivery pump is started to recover normal heat exchange work.
Furthermore, pulse adjustment is carried out by comparing a pH detector detection value on a refrigerant inlet pipe with a plate heat exchanger cleaning pH set value so as to automatically control the adding amount of the cleaning agent.
Advantageous effects
The full-automatic cleaning plate type heat exchange device and the cleaning control method provided by the invention have the following advantages:
(1) the investment cost is low, economic benefits is high, and it only needs to increase a small amount of communicating pipes, electric control valve, pH detector, temperature sensor, pressure sensor and electrical control system on traditional plate heat exchanger, can avoid the normal production that the manual work unpicks and washes the heat transfer slab and cause to stop, heat exchanger gasket, slab damage bring great economic loss.
(2) The automation degree is high, and the running and cleaning processes can be completed without manual operation.
(3) The operation is nimble, and the reliability is high, and pressure and temperature jointly judge, avoids wasing the medicament and extravagant when guaranteeing the cleaning performance.
(4) The method is economical and environment-friendly, and the refrigerant added with the cleaning agent is used as the cleaning liquid of the plate heat exchanger for cyclic utilization, so that the construction investment of a cleaning device is reduced, and the waste of cleaning water can be reduced.
Drawings
FIG. 1 is a schematic structural diagram of a fully automatic self-cleaning plate type heat exchange device in an embodiment 1 of the invention;
fig. 2 is a flow chart of a cleaning control method of the fully automatic self-cleaning plate type heat exchange device in embodiment 1 of the present invention.
In the drawings: 1. a plate heat exchanger; 2. a heating medium reservoir; 3. a refrigerant reservoir; 4. a cleaning agent reservoir; 5. a heating medium inlet pipe; 6. a heat medium outlet pipe; 7. a refrigerant inlet pipe; 8. a refrigerant outlet pipe; 9. a cleaning agent dosing pipe; 10. a first communication pipe; 11. a second communicating pipe; 12. a first control valve; 13. a second control valve; 14. a third control valve; 15. a fourth control valve; 16. a heat medium delivery pump; 17. a refrigerant delivery pump; 18. a cleaning agent delivery pump; 19. a first pressure sensor; 20. a second pressure sensor; 21. a first temperature sensor; 22. a second temperature sensor; 23. a pH detector; 24. an electrical control system; 25. A first check valve; 26. a second check valve.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following description of the technical solutions of the present invention with reference to the accompanying drawings of the present invention is made clearly and completely, and other similar embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments in the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
Detailed description of the preferred embodiment 1
A full-automatic self-cleaning plate type heat exchange device is shown in figure 1 and comprises a plate type heat exchanger 1, a heat medium inlet pipe 5 and a heat medium outlet pipe 6 which are connected with a heat medium channel of the plate type heat exchanger 1, a refrigerant inlet pipe 7 and a refrigerant outlet pipe 8 which are connected with a refrigerant channel of the plate type heat exchanger 1, a cleaning agent feeding pipe 9 connected with the refrigerant inlet pipe 7, a first communicating pipe 10 connected with the refrigerant outlet pipe 8 and the heat medium inlet pipe 5, and a second communicating pipe 11 connected with the refrigerant outlet pipe 8 and the heat medium outlet pipe 6, wherein a heat medium delivery pump 16, a refrigerant delivery pump 17 and a cleaning agent delivery pump 18 are respectively arranged on the heat medium inlet pipe 5, the refrigerant inlet pipe 7 and the cleaning agent feeding pipe 9, a first control valve 12, a second control valve 13, a third control valve 14 and a fourth control valve 15 are respectively arranged on the heat medium outlet pipe 6, the refrigerant outlet pipe 8, the first communicating pipe, one end of the first communicating pipe 10 is connected to the heating medium inlet pipe 5, the other end is connected to the refrigerant outlet pipe 8 at the inlet end of the second control valve 13, one end of the second communicating pipe 11 is connected to the heating medium outlet pipe 6 at the inlet end of the first control valve 12, and the other end is connected to the refrigerant outlet pipe 8 at the outlet end of the second control valve 13.
Specifically, the plate heat exchanger 1 includes a refrigerant passage and a heat medium passage.
Further, this full-automatic self-cleaning plate heat exchange device still includes first pressure sensor 19 that is used for detecting 1 heat medium passageway entry end pressure value of plate heat exchanger, is used for detecting 1 refrigerant passageway entry end pressure value of plate heat exchanger second pressure sensor 20, and first pressure sensor 19 sets up on heat medium inlet tube 5 between heat medium inlet tube 5 and first connecting pipe 10 junction and plate heat exchanger 1, and first pressure sensor 19 is used for judging whether the heat medium passageway is scale deposit and blocks. The second pressure sensor 20 is arranged on the refrigerant inlet pipe 7 between the joint of the refrigerant inlet pipe 7 and the cleaning liquid dosing pipe 9 and the plate heat exchanger 1, and the second pressure sensor 20 is used for judging whether the refrigerant channel is scaled and blocked.
Further, the full-automatic self-cleaning plate type heat exchange device also comprises a first temperature sensor 21 for detecting the temperature value of the inlet end of a heat medium channel of the plate type heat exchanger 1 and a second temperature sensor 22 for detecting the temperature value of the outlet end of the heat medium channel of the plate type heat exchanger 1, the first temperature sensor 21 and the first pressure sensor 19 are arranged on the heat medium inlet pipe 5 between the joint of the heat medium inlet pipe 5 and the first communicating pipe 10 and the plate type heat exchanger 1 in parallel, the second temperature sensor 22 is arranged on the heat medium outlet pipe 6 between the joint of the heat medium outlet pipe 6 and the second communicating pipe 11 and the plate type heat exchanger 1, the first temperature sensor 21 and the second temperature sensor 22 respectively detect the temperature values of the inlet end and the outlet end of the heat medium channel of the plate type heat exchanger, and comparing the difference value of the temperature values of the inlet end and the outlet end of the heat medium channel of the plate heat exchanger 1 with a cleaning temperature difference set value to judge whether the temperature difference of the inlet and the outlet of the plate heat exchanger 1 is reduced due to scaling of the heat medium channel.
Further, still be provided with pH detector 23 on refrigerant inlet tube 7, pH detector 23 is located between refrigerant inlet tube 7 and the connecting department of cleaner dosing pipe 9 and plate heat exchanger 1, and this pH detector 23 is used for controlling the cleaner volume of throwing.
Further, the full-automatic self-cleaning plate type heat exchange device further comprises an electric control system 24, wherein the electric control system 24 is respectively connected with the first control valve 12, the second control valve 13, the third control valve 14, the fourth control valve 15, the heat medium delivery pump 16, the refrigerant delivery pump 17, the cleaning agent delivery pump 18, the first temperature sensor 21, the second temperature sensor 22, the first pressure sensor 19, the second pressure sensor 20 and the pH detector 23.
In this embodiment, the first control valve 12, the second control valve 13, the third control valve 14, and the fourth control valve 15 are all electric control valves, which has the advantages of accurate and fast control response, remotely opening and closing corresponding pipelines according to electric signals sent by the electric control system 24, and meanwhile, the closing speed is adjustable, and the corresponding pipelines can be closed stably without generating pressure fluctuation during closing.
Preferably, a first check valve 25 for preventing the backflow of the heating medium in the heating medium inlet pipe 5 and a second check valve 26 for preventing the backflow of the cleaning agent in the cleaning agent dosing pipe 9 are respectively arranged on the heating medium inlet pipe 5 and the cleaning agent dosing pipe 9, and the first check valve 25 is positioned on the heating medium inlet pipe 5 between the joint of the heating medium inlet pipe 5 and the first communication pipe 10 and the heating medium delivery pump 16.
Further, this full-automatic plate heat transfer device of self-cleaning still includes and connects in the terminal heat medium accumulator 2 of heat medium inlet pipe 5 and heat medium outlet pipe 6, connect in the terminal refrigerant accumulator 3 of refrigerant inlet pipe 7 and refrigerant outlet pipe 8, connect in the terminal cleaner accumulator 4 of cleaner dosing pipe 9, the inlet fluid end of heat medium inlet pipe 5 and the liquid outlet on the heat medium accumulator 2 communicate, the liquid outlet end of heat medium outlet pipe 6 is connected with the income liquid mouth on the heat medium accumulator 2, the inlet fluid end of refrigerant inlet pipe 7 is connected with the liquid outlet on the refrigerant accumulator 3, the liquid outlet end of refrigerant outlet pipe 8 is connected with the inlet on the refrigerant accumulator 3.
Preferably, the cleaning agent reservoir 4 stores sulfuric acid or oxalic acid.
The full-automatic self-cleaning plate type heat exchange device provided by the invention can cause blockage to a medium channel and pressure rise after the heat exchange plates of the plate type heat exchanger 1 are scaled, or the temperature difference between the medium entering and exiting the plate heat exchanger 1 becomes smaller after the heat exchange effect becomes worse due to scaling, by setting a set value of the cleaning pressure of the refrigerant channel, a set value of the cleaning pressure of the heating medium channel or a set value of the cleaning temperature difference of the plate heat exchanger 1 in the electric control system 24, when the difference between the detected value of the first pressure sensor 19 and the detected value of the second pressure sensor 20 or the detected value of the first temperature sensor 21 and the detected value of the second temperature sensor 22 reaches the set value condition value, the electric control system 24 automatically cleans the plate heat exchanger 1 according to the pre-programmed logic, and the operator only needs to ensure that the cleaning agent is added into the cleaning agent storage 4, and can complete the on-line automatic cleaning process of the plate heat exchanger 1 without other operations.
A cleaning control method of a full-automatic self-cleaning plate type heat exchange device is disclosed, as shown in figure 2, after the heat exchange work of the full-automatic self-cleaning plate type heat exchange device is started, a detection value of a first pressure sensor 19 and a detection value of a second pressure sensor 20 are obtained in real time, the detection value of the first pressure sensor 19 is compared with a cleaning pressure set value of a heat medium channel, the detection value of the second pressure sensor 20 is compared with a cleaning pressure set value of a cooling medium channel, whether the heat medium channel and the cooling medium channel of a plate type heat exchanger 1 are blocked or not is judged according to a comparison result, and the opening and closing of a control valve and a delivery pump on a;
and/or the electric control system 24 calculates the difference value between the detection value of the first temperature sensor 21 and the detection value of the second temperature sensor 22, compares the difference value with the cleaning temperature difference set value, compares the detection value of the first pressure sensor 19 with the cleaning pressure set value of the heat medium channel, judges whether the refrigerant channel and the heat medium channel of the plate heat exchanger 1 are blocked according to the comparison result, and adjusts the opening and closing of the control valve and the delivery pump on the corresponding pipeline according to the judgment result.
The heat exchange work of starting the full-automatic self-cleaning heat exchange device is as follows: the electric control system 24 controls to open the second control valve 13, close the third control valve 14 on the first communication pipe 10, start the refrigerant delivery pump 17, input the refrigerant delivery time in the electric control system 24 as t1 minutes, start operation for t1 minutes, open the first control valve 12 on the heat medium outlet pipe 6, close the fourth control valve 15 on the second communication pipe 11, start the heat medium delivery pump 16, and finish normal heat exchange operation start.
Specifically, the detection value of the first pressure sensor 19 and the detection value of the second pressure sensor 20 are acquired in real time, respectively comparing the detection value of the first pressure sensor 19 with the set value of the cleaning pressure of the heat medium channel and the detection value of the second pressure sensor 20 with the set value of the cleaning pressure of the cooling medium channel, the cleaning pressure value of the heating medium channel and the cleaning pressure value of the cooling medium channel are preset and input to the electric control system 24, when the detection value of the second pressure sensor 20 is more than or equal to the set cleaning pressure value of the cooling medium channel and the detection value of the first pressure sensor 19 is less than the set cleaning pressure value of the heating medium channel, the plate heat exchanger 1 is judged to have the scaling blockage condition of the cooling medium channel, at the moment, the electrical control system 24 controls and starts the cleaning agent delivery pump 18 to clean the refrigerant channel, and the detection value of the pH detector 23 on the refrigerant inlet pipe 7 is compared with the pH set value of the plate heat exchanger 1 to carry out pulse adjustment so as to automatically control the adding amount of the cleaning agent. The time for delivering the cleaning agent is t2 minutes in the electric control system 24, after cleaning is started for t2 minutes, the cleaning agent delivery pump 18 is closed, and then normal heat exchange work is resumed.
When the detection value of the second pressure sensor 20 is greater than or equal to the set cleaning pressure value of the refrigerant channel and the detection value of the first pressure sensor 19 is greater than or equal to the set cleaning pressure value of the heat medium channel, it is determined that both the refrigerant channel and the heat medium channel of the plate heat exchanger 1 are in the scaling blockage condition, at this time, the electric control system 24 controls to close the heat medium delivery pump 16, open the third control valve 14 on the first communication pipe 10, close the second control valve 13 on the refrigerant outlet pipe 8, flush the heat medium channel by using the refrigerant, input flush time t3 minutes in the electric control system 24, open the fourth control valve 15 on the second communication pipe 11 after flush t3 minutes, close the first control valve 12 on the heat medium outlet pipe 6, and then start the cleaning agent delivery pump 18 to clean the refrigerant channel. The pulse adjustment is carried out by comparing the detection value of the pH detector 23 on the refrigerant inlet pipe 7 with the cleaning pH set value of the plate heat exchanger 1 so as to automatically control the adding amount of the cleaning agent. The time for delivering the cleaning agent is t4 minutes, after cleaning is started for t4 minutes, the second control valve 13 on the refrigerant outlet pipe 8 is opened, the third control valve 14 on the first communication pipe 10 is closed, the first control valve 12 on the heating medium outlet pipe 6 is opened, the fourth control valve 15 on the second communication pipe 11 is closed, and the heating medium delivery pump 16 is started to return to the normal heat exchange operation.
The electric control system 24 calculates a difference between the detection value of the first temperature sensor 21 and the detection value of the second temperature sensor 22 and compares the difference with a set cleaning temperature difference value, which is preset and input to the electric control system 24, and compares the detection value of the first pressure sensor 19 with a set cleaning pressure of the heat medium passage. When the difference value between the detection value of the first temperature sensor 21 and the detection value of the second temperature sensor 22 is smaller than the cleaning temperature difference set value and the first pressure sensor 19 is smaller than the cleaning pressure set value of the heat medium channel, the plate heat exchanger 1 is judged to have the scaling blockage situation in the refrigerant channel. At this time, the electrical control system 24 controls and starts the cleaning agent delivery pump 18 to clean the refrigerant channel, and the detection value of the pH detector 23 on the refrigerant inlet pipe 7 is compared with the pH set value of the plate heat exchanger 1 to perform pulse adjustment, so as to automatically control the dosage of the cleaning agent. The time for delivering the cleaning agent is t2 minutes in the electric control system 24, after cleaning is started for t2 minutes, the cleaning agent delivery pump 18 is closed, and then normal heat exchange work is resumed.
When the difference value between the detection value of the first temperature sensor 21 and the detection value of the second temperature sensor 22 is smaller than the cleaning temperature difference set value and the first pressure sensor 19 is larger than or equal to the cleaning pressure set value of the heat medium channel, the situation that both the refrigerant channel and the heat medium channel of the plate heat exchanger 1 are scaled and blocked is judged. At this time, the electric control system 24 controls the heat medium delivery pump 16 to be turned off, the third control valve 14 on the first communication pipe 10 is opened, the second control valve 13 on the refrigerant outlet pipe 8 is then closed, the heat medium passage is flushed with the refrigerant, the flushing time t3 minutes is input into the electric control system 24, the fourth control valve 15 on the second communication pipe 11 is then opened after the flushing time t3 minutes, the first control valve 12 on the heat medium outlet pipe 6 is then closed, and the cleaning agent delivery pump 18 is then started to clean the refrigerant passage. The pulse adjustment is carried out by comparing the detection value of the pH detector 23 on the refrigerant inlet pipe 7 with the cleaning pH set value of the plate heat exchanger 1 so as to automatically control the adding amount of the cleaning agent. The time for delivering the cleaning agent is t4 minutes, after cleaning is started for t4 minutes, the second control valve 13 on the refrigerant outlet pipe 8 is opened, the third control valve 14 on the first communication pipe 10 is closed, the first control valve 12 on the heating medium outlet pipe 6 is opened, the fourth control valve 15 on the second communication pipe 11 is closed, and the heating medium delivery pump 16 is started to return to the normal heat exchange operation.
The full-automatic self-cleaning plate type heat exchange device and the cleaning control method provided by the invention enable the plate type heat exchanger 1 to run and clean in a full-automatic manner without stopping, the cleaning time is short, and the production is not influenced; manual operation is not needed, and manual damage to equipment is avoided; the cleaning water is not required to be additionally arranged, pollution discharge is avoided, and the cleaning water is economical and environment-friendly and has good use prospect and popularization value.
Specific example 2
This embodiment is no longer repeated with the place that concrete embodiment 1 is the same, the difference lies in replacing first pressure sensor and second pressure sensor, full-automatic self-cleaning plate heat transfer device is still including the third temperature sensor who is used for detecting plate heat exchanger refrigerant passageway entry end temperature value, a fourth temperature sensor who is used for detecting plate heat exchanger refrigerant passageway exit end temperature value, third temperature sensor sets up on refrigerant inlet tube between refrigerant inlet tube and washing liquid dosing pipe junction and plate heat exchanger, fourth temperature sensor sets up on the refrigerant outlet tube between refrigerant outlet tube and the junction of first connecting pipe and the plate heat exchanger. And comparing the temperature difference of the refrigerant at the inlet end and the outlet end of the refrigerant channel of the plate heat exchanger with a cleaning temperature difference set value of the refrigerant channel, judging whether the refrigerant channel is blocked according to a comparison result, and adjusting the opening and closing of a control valve and a delivery pump on a corresponding pipeline according to a judgment result.
Specific example 3
The same place of this embodiment and specific embodiment 1 is not repeated, and the difference lies in, does not utilize the refrigerant to wash plate heat exchanger but adds the washing water tank in addition.
Specific example 4
The same parts of this embodiment as those of embodiment 1 will not be described again, except that a cleaning water drain pipe is added to dispose the refrigerant outside the refrigerant discharge device in order to avoid the refrigerant entering the heat medium storage.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (10)
1. A full-automatic self-cleaning plate type heat exchange device is characterized by comprising a plate type heat exchanger, a heat medium inlet pipe and a heat medium outlet pipe which are connected with a heat medium channel of the plate type heat exchanger, a refrigerant inlet pipe and a refrigerant outlet pipe which are connected with a refrigerant channel of the plate type heat exchanger, a cleaning agent dosing pipe connected with the refrigerant inlet pipe, a first communicating pipe connected with the refrigerant outlet pipe and the heat medium inlet pipe, and a second communicating pipe connected with the refrigerant outlet pipe and the heat medium outlet pipe, wherein a heat medium delivery pump, a refrigerant delivery pump and a cleaning agent delivery pump are respectively arranged on the heat medium inlet pipe, the refrigerant inlet pipe and the cleaning agent dosing pipe, a first control valve, a second control valve, a third control valve and a fourth control valve are respectively arranged on the heat medium outlet pipe, the refrigerant outlet pipe, the first communicating pipe and the second communicating pipe, one end of the first communicating pipe, the other end of the second communicating pipe is connected to a refrigerant outlet pipe at the liquid inlet end of the second control valve, one end of the second communicating pipe is connected to a heat medium outlet pipe at the liquid inlet end of the first control valve, and the other end of the second communicating pipe is connected to a refrigerant outlet pipe at the liquid outlet end of the second control valve.
2. The automatic cleaning plate type heat exchange device according to claim 1, further comprising a first pressure sensor for detecting the pressure value at the inlet end of the heat medium channel of the plate type heat exchanger, and a second pressure sensor for detecting the pressure value at the inlet end of the refrigerant channel of the plate type heat exchanger, wherein the first pressure sensor is arranged on the heat medium inlet pipe between the joint of the heat medium inlet pipe and the first communication pipe and the plate type heat exchanger, and the second pressure sensor is arranged on the refrigerant inlet pipe between the joint of the refrigerant inlet pipe and the cleaning liquid feeding pipe and the plate type heat exchanger.
3. The automatic cleaning plate type heat exchange device according to claim 2, further comprising a first temperature sensor for detecting a temperature value at an inlet end of a heat medium channel of the plate type heat exchanger, and a second temperature sensor for detecting a temperature value at an outlet end of the heat medium channel of the plate type heat exchanger, wherein the first temperature sensor and the first pressure sensor are arranged in parallel on the heat medium inlet pipe between the connection of the heat medium inlet pipe and the first communication pipe and the plate type heat exchanger, and the second temperature sensor is arranged on the heat medium outlet pipe between the connection of the heat medium outlet pipe and the second communication pipe and the plate type heat exchanger.
4. The full-automatic self-cleaning plate type heat exchange device according to claim 3, wherein a pH detector is further arranged on the refrigerant inlet pipe, and the pH detector is located between the joint of the refrigerant inlet pipe and the cleaning agent feeding pipe and the plate type heat exchanger.
5. The automatic cleaning plate type heat exchange device according to claim 4, further comprising an electrical control system, wherein the electrical control system is respectively connected with the first control valve, the second control valve, the third control valve, the fourth control valve, the heat medium delivery pump, the refrigerant delivery pump, the cleaning agent delivery pump, the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor and the pH detector.
6. The plate heat exchanger of claim 1, wherein the heating medium inlet pipe and the cleaning agent feeding pipe are respectively provided with a first check valve for preventing the heating medium in the heating medium inlet pipe from flowing back and a second check valve for preventing the cleaning agent in the cleaning agent feeding pipe from flowing back, and the first check valves are located on the heating medium inlet pipe between the connection of the heating medium inlet pipe and the first communication pipe and the heating medium delivery pump.
7. The full-automatic self-cleaning plate type heat exchange device according to claim 1, further comprising a heat medium reservoir connected to the ends of the heat medium inlet pipe and the heat medium outlet pipe, a refrigerant reservoir connected to the ends of the refrigerant inlet pipe and the refrigerant outlet pipe, and a cleaning agent reservoir connected to the end of the cleaning agent dosing pipe, wherein the liquid inlet end of the heat medium inlet pipe is communicated with the liquid outlet on the heat medium reservoir, the liquid outlet end of the heat medium outlet pipe is connected with the liquid inlet on the heat medium reservoir, the liquid inlet end of the refrigerant inlet pipe is connected with the liquid outlet on the refrigerant reservoir, and the liquid outlet end of the refrigerant outlet pipe is connected with the liquid inlet on the refrigerant reservoir.
8. A cleaning control method of a full-automatic self-cleaning plate type heat exchange device is characterized in that after the heat exchange work of the full-automatic self-cleaning plate type heat exchange device is started, a first pressure sensor detection value and a second pressure sensor detection value are obtained in real time, the first pressure sensor detection value is compared with a heating medium channel cleaning pressure set value, the second pressure sensor detection value is compared with a cooling medium channel cleaning pressure set value, whether a heating medium channel and a cooling medium channel of the plate type heat exchanger are blocked or not is judged according to the comparison result, and the opening and closing of a control valve and a delivery pump on a corresponding pipeline are adjusted according to the judgment result;
and/or the electric control system calculates the difference value between the detection value of the first temperature sensor and the detection value of the second temperature sensor, compares the difference value with a cleaning temperature difference set value, compares the detection value of the first pressure sensor with a cleaning pressure set value of the heat medium channel, judges whether the refrigerant channel and the heat medium channel of the plate heat exchanger are blocked according to the comparison result, and adjusts the opening and closing of a control valve and a delivery pump on the corresponding pipeline according to the judgment result.
9. The method of claim 8, wherein when the second pressure sensor detects a value greater than or equal to the set coolant channel cleaning pressure and the first pressure sensor detects a value less than the set coolant channel cleaning pressure, and/or when the difference between the first temperature sensor detection value and the second temperature sensor detection value is less than the set cleaning temperature difference and the first pressure sensor detects a value less than the set coolant channel cleaning pressure, it is determined that the plate heat exchanger has a fouling in the coolant channel;
when the detection value of the second pressure sensor is greater than or equal to the cleaning pressure set value of the refrigerant channel and the detection value of the first pressure sensor is greater than or equal to the cleaning pressure set value of the heat medium channel and/or when the difference value between the detection value of the first temperature sensor and the detection value of the second temperature sensor is less than the cleaning temperature difference set value and the detection value of the first pressure sensor is greater than or equal to the cleaning pressure set value of the heat medium channel, the situation that both the refrigerant channel and the heat medium channel of the plate heat exchanger are scaled and blocked is judged;
when the condition that the refrigerant channel of the plate heat exchanger is scaled and blocked is judged, starting a cleaning agent delivery pump to clean the refrigerant channel, closing the cleaning agent delivery pump after cleaning for a period of time, and then recovering normal heat exchange work;
when the situation that scaling and blocking exist in both the refrigerant channel and the heat medium channel of the plate heat exchanger is judged, the heat medium delivery pump is closed, the third control valve is opened, the second control valve is closed, the heat medium channel is flushed by the refrigerant, the fourth control valve is opened and the first control valve is closed in sequence after the heat medium channel is flushed for a period of time, the cleaning agent delivery pump is started to clean the refrigerant channel, the second control valve is opened, the third control valve is closed, the first control valve is opened and the fourth control valve is closed in sequence after the cleaning is performed for a period of time, and then the heat medium delivery pump is started to recover normal heat exchange work.
10. The method for controlling cleaning of a full-automatic self-cleaning plate heat exchange device according to claim 9, wherein the amount of cleaning agent is automatically controlled by performing pulse adjustment through comparing the detection value of the pH detector on the refrigerant inlet pipe with the cleaning pH set value of the plate heat exchanger.
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