CN109708519B - Plate type heat exchanger dirt resistance on-line monitoring and automatic cleaning system - Google Patents
Plate type heat exchanger dirt resistance on-line monitoring and automatic cleaning system Download PDFInfo
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- CN109708519B CN109708519B CN201910036270.0A CN201910036270A CN109708519B CN 109708519 B CN109708519 B CN 109708519B CN 201910036270 A CN201910036270 A CN 201910036270A CN 109708519 B CN109708519 B CN 109708519B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 27
- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 101
- 238000005554 pickling Methods 0.000 claims abstract description 43
- 238000005406 washing Methods 0.000 claims abstract description 41
- 238000003860 storage Methods 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 230000001502 supplementing effect Effects 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000011086 high cleaning Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Cleaning By Liquid Or Steam (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides an on-line monitoring and automatic cleaning system for pollution resistance of a plate heat exchanger, which comprises the plate heat exchanger, a material pipeline, a heat medium pipeline, an acid washing pump and an acid storage tank; the heat exchanger comprises a cold side inlet, a cold side outlet, a hot side inlet and a hot side outlet, the material pipeline is connected to the cold side inlet and the cold side outlet, and the hot medium pipeline is connected to the hot side inlet and the hot side outlet; the cold side outlet is provided with a first temperature sensor and a first pressure sensor; the acid storage tank is connected with the acid washing pump, the acid washing pump is connected with the acid washing pipeline, the acid washing pipeline and the material pipeline are connected to the cold side inlet side through the first three-way electromagnetic valve, and the acid washing pump can convey acid washing liquid to the cold side inlet; the first temperature sensor and the first pressure sensor are respectively connected with a control board, and the control board is connected with the pickling pump and the first three-way electromagnetic valve. The invention can monitor the pollution resistance of the heat exchanger to automatically switch the material line and the acid washing line, thereby realizing high-efficiency online cleaning.
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to a pollution resistance on-line monitoring and automatic cleaning system for a plate heat exchanger.
Background
Compared with a shell-and-tube type, the plate heat exchanger has higher heat exchange coefficient and is widely applied to the preheating section of the MVR evaporation system. When the high-salt wastewater is preheated, certain chemical components (mainly calcium, magnesium and the like) in the wastewater are crystallized and separated out due to temperature change, so that the heat exchange surface is formed into a pollution resistance, and the pollution resistance needs to be cleaned by using pickling solution. The decontamination of the plate heat exchanger is more difficult to carry out than the flow cross section of the tube heat exchanger. The traditional mechanical descaling is high in labor intensity and easy to damage the plate. Therefore, the main problems of the conventional plate heat exchanger are as follows: repeated disassembly and assembly are high in work intensity, high in labor cost and high in damage degree of the plates; cannot be monitored on line in real time, occupies a lot of production time and has low cleaning efficiency.
Disclosure of Invention
The invention aims to provide an on-line monitoring and automatic cleaning system for the pollution resistance of a plate heat exchanger, which is suitable for cleaning and removing an acid-soluble pollution layer formed in the preheating process, and has the advantages of no need of repeated disassembly and assembly, low labor cost and small damage to plates; can monitor in real time on line and has high cleaning efficiency.
The invention provides the following technical scheme:
the on-line pollution resistance monitoring and automatic cleaning system for the plate heat exchanger comprises a plate heat exchanger, a material pipeline, a heat medium pipeline, an acid washing pump and an acid storage tank; the plate heat exchanger comprises a cold side inlet and a cold side outlet which are communicated with each other, and a hot side inlet and a hot side outlet which are communicated with each other, wherein a material pipeline is respectively connected to the cold side inlet and the cold side outlet, and a heat medium pipeline is respectively connected to the hot side inlet and the hot side outlet; a first temperature sensor and a first pressure sensor are arranged at the inlet side of the cold side of the material pipeline, and a second temperature sensor and a second pressure sensor are arranged at the outlet side of the cold side of the material pipeline; the liquid outlet of the acid storage tank is connected with an acid washing pump, the acid washing pump is connected with an acid washing pipeline, the acid washing pipeline and the material pipeline are connected in parallel with the cold side inlet side of the plate heat exchanger, a first three-way electromagnetic valve is arranged at the joint of the acid washing pipeline and the material pipeline at the cold side outlet side, and the acid washing pump can convey acid washing liquid to the cold side inlet; the control cabinet is internally provided with a control board, the first temperature sensor, the first pressure sensor, the second temperature sensor, the second pressure sensor and the setting keys are respectively connected with the signal input end of the control board, the signal output end of the control board is respectively connected with the pickling pump and the first three-way electromagnetic valve, the control board is internally provided with a memory and an arithmetic unit, the signal input end is connected with the memory, the memory is mutually connected with the arithmetic unit, and the arithmetic unit is connected with the signal output end.
Preferably, a second three-way electromagnetic valve is arranged on the material pipeline at the outlet side of the cold side, and a third interface of the second three-way electromagnetic valve is connected with a liquid inlet of the acid storage tank through an acid washing pipeline; the signal output end of the control board card is connected with a second three-way electromagnetic valve.
Preferably, the lower side of the acid storage tank is provided with a PH value on-line detector which is connected with the signal input end of the control board card; the acid storage tank is characterized in that a water supplementing pipeline and an acid supplementing pipeline are arranged on a liquid inlet of the acid storage tank in parallel, a water supplementing valve is arranged on the water supplementing pipeline, an acid supplementing valve is arranged on the acid supplementing pipeline, and a signal output end of a control board card is respectively connected with the water supplementing valve and the acid supplementing valve.
Preferably, the liquid outlet of the acid storage tank is also connected with an acid discharge pipeline.
Preferably, the acid storage tank is further provided with a circulation branch pipe, two ends of the circulation branch pipe are respectively connected with the outlet of the pickling pump and the acid storage tank, and the circulation branch pipe is provided with a ball valve.
Preferably, the acid storage tank is provided with a liquid level meter, and the liquid level meter is connected with the signal input end of the control board card.
The beneficial effects of the invention are as follows: the invention is suitable for cleaning and removing the acid soluble dirt layer formed in the preheating process, the dirt resistance condition in the plate type heat exchanger is monitored by monitoring the temperature and pressure value at the cold side outlet of the plate type heat exchanger in real time in a central control room, and the automatic switching of a material line and a pickling line in the cold side of the heat exchanger is realized by the output of a control signal, so that the automatic cleaning is realized, the cleaning working intensity is reduced, and the labor cost is saved; the non-dismounting flushing is realized, and the mechanical damage of the plate caused by dismounting is avoided; the cleaning efficiency is high, a large amount of production time occupied during traditional flushing is avoided, the optimization of production time and maintenance time is realized, and the maximization of economic benefit is realized.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a control system connection of the present invention;
fig. 3 is a schematic diagram of the calculation principle of the temperature and pressure of the cold side of the plate heat exchanger according to the invention.
Marked in the figure as: 1. a plate heat exchanger; 11. a cold side inlet; 12. a cold side outlet; 13. a hot side inlet; 14. a hot side outlet; 2. a material pipe; 21. a first temperature sensor; 22. a first pressure sensor; 23. a second temperature sensor; 24. a second pressure sensor; 25. a second three-way electromagnetic valve; 3. a heat medium pipe; 41. a pickling pump; 42. acid storage tank; 421. a liquid inlet; 422. a liquid outlet; 43. acid washing pipelines; a pH on-line meter; 45. a water replenishing pipe; 451. a water supplementing valve; 46. an acid supplementing pipeline; 461. an acid supplementing valve; 47. an acid discharge pipe; 48. a circulation branch pipe; 49. a liquid level gauge; 5. a first three-way electromagnetic valve; 6. a control board card; 7. and setting a terminal.
Detailed Description
As shown in fig. 1 to 3, the on-line monitoring and automatic cleaning system for the pollution resistance of the plate heat exchanger is suitable for cleaning and removing the acid-soluble pollution layer formed in the preheating system. The device comprises a plate heat exchanger 1, a material pipeline 2, a heat medium pipeline 3, an acid washing pipeline 43, an acid washing pump 41 and an acid storage tank 42; the plate heat exchanger 1 comprises a cold side inlet 11 and a cold side outlet 12 which are communicated with each other, and a hot side inlet 13 and a hot side outlet 14 which are communicated with each other; the material pipeline 2 is respectively connected to the cold side inlet 11 and the cold side outlet 12, and the heat medium pipeline 3 is respectively connected to the hot side inlet 13 and the hot side outlet 14; a first temperature sensor 21 and a first pressure sensor 22 are arranged on the outlet side of the cold side of the material pipeline 2, and a second temperature sensor 23 and a second pressure sensor 24 are arranged on the inlet side of the cold side of the material pipeline 2; the liquid outlet of the acid storage tank 42 is connected with the acid washing pump 41, the acid washing pump 41 is connected with the acid washing pipeline 43, the acid washing pipeline 43 and the material pipeline 2 are connected to the cold side inlet side of the plate heat exchanger through the first three-way electromagnetic valve 5, and the acid washing pump 41 can convey acid washing liquid to the cold side inlet 11; the control board 6 is arranged in a control cabinet of the DCS control system, the first temperature sensor 21, the first pressure sensor 22, the second temperature sensor 23, the second pressure sensor 24 and the setting terminal 7 are respectively connected with a signal input end of the control board 6, and the DCS control system is used for connecting the control cabinet with a computer, so the setting terminal 7 can be a computer keyboard and a display screen. The temperature difference threshold Q and the pressure difference threshold N at the cold side outlet 12 can be input through the set terminal, and the two values are summarized according to practical working condition experience and are used for guaranteeing stable and efficient heat exchange of the system; the signal output part of the control board card 6 is respectively connected with the pickling pump 41 and the first three-way electromagnetic valve 5, a memory and an arithmetic unit are arranged in the control board card 6, the signal input part of the control board card 6 is connected with the memory, each input signal is stored in the memory, the memory is mutually connected with the arithmetic unit, the arithmetic unit is connected with the signal output part of the control board card 6, and the control board card 6 can send a starting or closing signal to the pickling pump 41 and switch the electric signal in the direction of the first three-way electromagnetic valve 5, so that people can be fed into the cold side inlet 11 or pickling liquid can be fed into the cold side inlet 11. Because the heat exchanger has the optimal heat exchange effect when the new system starts to operate, after the materials flow out of the plate-type heat exchanger from the cold side outlet, the first temperature sensor 21, the second temperature sensor 23, the first pressure sensor 22 and the second pressure sensor 24 respectively detect initial temperature values T1 and T2 and initial pressure difference values P1 and P2 corresponding to the initial temperature values T1 and T2 and the initial pressure difference values P1 and P2, and the initial temperature values T and P2 are sent to a memory of the control board for storage; the arithmetic unit respectively performs difference operation on T1, T2, P1 and P2 to respectively obtain a temperature difference set value A and a pressure difference set value B, and stores the temperature difference set value A and the pressure difference set value B into the memory. The first temperature sensor 21 and the second temperature sensor 23, the first pressure sensor 22 and the second pressure sensor 24 continuously acquire temperature signals and pressure signals and send the temperature signals and the pressure signals to a memory and an arithmetic unit, the arithmetic unit compares and calculates a real-time temperature difference value delta Ti and a temperature difference set value A of the first temperature sensor 21 and the second temperature sensor 23, compares the operation result with a temperature difference threshold Q, judges whether the difference value of the real-time temperature difference value delta Ti and the temperature difference set value A exceeds the temperature difference threshold Q, and temporarily stores the first operation result into the memory; similarly, the arithmetic unit compares the real-time differential pressure value delta Pi with the differential pressure set value B, compares the operation result with the differential pressure threshold value N, judges whether the differential value of the real-time differential pressure value delta Pi and the differential pressure set value B exceeds the differential pressure threshold value N, and stores the second operation result into the memory; the arithmetic unit performs an and operation on the first operation result and the second operation result, namely: when the difference between the real-time temperature difference value delta Ti and the temperature difference set value A exceeds the temperature difference threshold value Q and the difference between the real-time pressure difference value delta Pi and the pressure difference set value B exceeds the pressure difference threshold value N, the arithmetic unit sends a high level to the signal output end of the control board 6, the control board 6 sends an electric signal to the first three-way electromagnetic valve 5, the material pipeline 2 is closed, the pickling pipeline 43 is connected to the cold side inlet 11 of the plate heat exchanger, the pickling pump 41 is started, the pickling liquid in the acid storage tank 42 is conveyed into the plate heat exchanger 1, and the dirt resistance in the pickling liquid is cleaned.
The material pipeline 2 at the side of the cold side outlet 12 is provided with a second three-way electromagnetic valve 25, and a third interface of the second three-way electromagnetic valve 25 is connected with a liquid inlet 421 of the acid storage tank 42 through an acid washing pipeline, so that the acid washing liquid can be circularly washed, and the acid washing liquid is saved; the signal output end of the control board 6 is connected with the second three-way electromagnetic valve 25, and the control board 6 simultaneously controls the first three-way electromagnetic valve 5 and the second three-way electromagnetic valve 25 to act, namely simultaneously controls the cold side inlet 11 and the cold side outlet 12 to be circulating materials or pickling solution.
The PH value on-line detector 44 is arranged at the lower side of the acid storage tank 42, the PH value on-line detector 44 is inserted into the acid storage tank 42, the PH value on-line detector 44 is connected with the signal input end of the control board card 6, and the PH value of the pickling solution in the acid storage tank 42 is stored in the memory of the control board card 6; the water supplementing pipeline 45 and the acid supplementing pipeline 46 are connected in parallel on the liquid inlet 421 of the acid storage tank 42, the water supplementing valve 451 is arranged on the water supplementing pipeline 45, the acid supplementing valve 461 is arranged on the acid supplementing pipeline 46, and the signal output end of the control board card 6 is respectively connected with the water supplementing valve 451 and the acid supplementing valve 461. Since most acid ions show a large difference in acidity at different PH, too strong acidity can cause corrosion to the heat exchange plate. In order to slow down the corrosion of the pickling to the sheet, the pH value of the pickling solution needs to be strictly controlled. The system is characterized in that a PH value on-line detector 44 is additionally arranged on the lower side of an acid storage tank 42, a PH set value (namely, the minimum acidity value while ensuring the cleaning effect) is input to a control board card 6 through a set terminal 7, an arithmetic unit in the control board card 6 carries out real-time comparison operation on a PH measured value and the PH set value, when the PH measured value is smaller, the control board card 6 sends a signal to a water supplementing valve 451, the water supplementing valve 451 is opened, and water is supplemented to the acid storage tank 42 through a water supplementing pipeline 45, so that corrosion of pickling solution to equipment is reduced; when the PH measured value is higher, the control board 6 sends a signal to the acid supplementing valve 461, and the acid supplementing valve is opened to ensure the acid washing effect. The acidity online automatic control is realized through the above process, so that deviation caused by subjectivity of manual adjustment is reduced.
The acid tank 42 also has an acid discharge pipe 47 connected to the liquid outlet 422, and the waste pickling liquid is discharged through the acid discharge pipe 47.
The acid storage tank 42 is also provided with a circulation branch pipe 48, two ends of the circulation branch pipe 48 are respectively connected with the outlet of the pickling pump 41 and the acid storage tank 42, and the circulation branch pipe 48 is provided with a ball valve. When pickling is completed, the first three-way electromagnetic valve 5 and the second three-way electromagnetic valve 25 act simultaneously, materials are re-connected into the cold side inlet 11 and the cold side outlet 12 of the plate heat exchanger 1, the pickling pump 41 continues to work for a period of time, residual pickling solution in the pickling pipeline 43 is conveyed into the pickling tank 42 through the circulating branch pipe 48, and then the pickling pump 41 is closed.
The acid storage tank 42 is provided with a liquid level meter 49, the liquid level meter 49 is connected with the signal input end of the control board card 6, and the display value of the liquid level meter 49 is observed to ensure that sufficient pickling liquid exists in the acid storage tank 42.
When the system is newly put into production, the first three-way electromagnetic valve and the second three-way electromagnetic valve are both disconnected from the pickling pipeline, the material pipeline is connected with the cold side inlet and the cold side outlet of the plate heat exchanger, the first temperature sensor 21 and the second temperature sensor 23, the first pressure sensor 22 and the second pressure sensor 24 respectively detect initial temperature values T1 and T2 and initial pressure difference values P1 and P2 corresponding to the initial temperature values T1 and T2 at the moment, and the initial temperature values T and the initial pressure difference values P1 and P2 are sent to a memory of a control board for storage; the arithmetic unit respectively carries out difference operation on T1, T2, P1 and P2 to respectively obtain a temperature difference set value A and a pressure difference set value B corresponding to the optimal heat exchange state, and the temperature difference set value A and the pressure difference set value B are stored in the memory. When the difference between the real-time temperature difference delta Ti and the temperature difference set value A exceeds the temperature difference threshold Q, and the difference between the real-time pressure difference delta Pi and the pressure difference set value B exceeds the pressure difference threshold N, the operator sends a high level to the signal output end of the control board card, the control board card sends an electric signal to the first three-way electromagnetic valve and the second three-way electromagnetic valve, the material pipeline is closed, the pickling pipeline is connected into the cold side inlet and the cold side outlet of the sheet type heat exchanger, the pickling pump is started, the pickling solution in the pickling tank is conveyed into the sheet type heat exchanger, and the dirt resistance in the pickling tank is circularly cleaned. At the moment, in the process of cleaning the heat exchanger, the heat medium is kept to flow in the heat medium pipeline and the plate heat exchanger all the time, and on one hand, the heat medium can accelerate the dissolution of dirt; on the other hand, the heat medium can also assist in reflecting the real-time heat exchange effect, and when the temperature of the first temperature sensor of the cold side outlet is found to gradually rise in the flushing process, then a fixed value is maintained, which indicates that the flushing achieves the expected effect. When the difference value of the real-time temperature difference value delta Ti and the temperature difference set value A is smaller than the temperature difference threshold value Q, or the difference value of the real-time pressure difference value delta P and the pressure difference set value B is smaller than the pressure difference threshold value N, the operator outputs a low level to the signal output end of the control board card, and at the moment, the control board card sends electric signals to the first three-way electromagnetic valve and the second three-way electromagnetic valve, the pickling pipeline is closed, and the material pipeline is re-connected to the cold side inlet and the cold side outlet of the plate type heat exchanger.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The on-line monitoring and automatic cleaning method of the plate heat exchanger dirt resistance on-line monitoring and automatic cleaning system is characterized in that the plate heat exchanger dirt resistance on-line monitoring and automatic cleaning system comprises a plate heat exchanger, a material pipeline, a pickling pipeline, a heat medium pipeline, a pickling pump and a pickling tank; the plate type heat exchanger comprises a cold side inlet and a cold side outlet which are communicated with each other, and a hot side inlet and a hot side outlet which are communicated with each other, wherein the material pipeline is respectively connected to the cold side inlet and the cold side outlet, and the heat medium pipeline is respectively connected to the hot side inlet and the hot side outlet; a first temperature sensor and a first pressure sensor are arranged on the cold side outlet side of the material pipeline, and a second temperature sensor and a second pressure sensor are arranged on the cold side inlet side of the material pipeline; the liquid outlet of the acid storage tank is connected with the acid washing pump, the acid washing pump is connected with the acid washing pipeline, the acid washing pipeline and the material pipeline are connected in parallel with the cold side inlet side of the plate heat exchanger, a first three-way electromagnetic valve is arranged at the joint of the acid washing pipeline and the material pipeline at the cold side inlet side, and the acid washing pump is used for conveying acid washing liquid to the cold side inlet through the acid washing pipeline; the control cabinet is internally provided with a control board, the first temperature sensor, the first pressure sensor, the second temperature sensor, the second pressure sensor and a setting key are respectively connected with a signal input end of the control board, a signal output end of the control board is respectively connected with the pickling pump and the first three-way electromagnetic valve, a memory and an arithmetic unit are arranged in the control board, the signal input end of the control board is connected with the memory, the memory is mutually connected with the arithmetic unit, and the arithmetic unit is connected with the signal output end of the control board;
a second three-way electromagnetic valve is arranged on the material pipeline at the outlet side of the cold side, and a third interface of the second three-way electromagnetic valve is connected with a liquid inlet of the acid storage tank through an acid washing pipeline to form circulation flow of acid washing liquid; the signal output end of the control board card is connected with the second three-way electromagnetic valve;
when the online monitoring and automatic cleaning system for the pollution resistance of the plate heat exchanger is newly put into production, the first three-way electromagnetic valve and the second three-way electromagnetic valve are both disconnected from an acid washing pipeline, a cold side inlet and a cold side outlet of the plate heat exchanger are connected with the material pipeline, the first temperature sensor and the second temperature sensor, the first pressure sensor and the second pressure sensor respectively detect initial temperature values T1 and T2 and initial pressure difference values P1 and P2 corresponding to the initial temperature values T1 and T2 at the moment, and the initial temperature values T1 and P2 are sent to a memory of a control board for storage; the arithmetic unit respectively carries out difference operation on T1, T2, P1 and P2 to respectively obtain a temperature difference set value A and a pressure difference set value B corresponding to the optimal heat exchange state, and the temperature difference set value A and the pressure difference set value B are stored in a memory;
when the difference between the real-time temperature difference delta Ti and the temperature difference set value A exceeds the temperature difference threshold Q, and the difference between the real-time pressure difference delta Pi and the pressure difference set value B exceeds the pressure difference threshold N, the operator sends a high level to the signal output end of the control board card, the control board card sends an electric signal to the first three-way electromagnetic valve and the second three-way electromagnetic valve, the material pipeline is closed, the pickling pipeline is connected to the cold side inlet and the cold side outlet of the plate-type heat exchanger, the pump is simultaneously started, and the pickling solution in the pickling tank is conveyed to the plate-type heat exchanger to carry out circulation cleaning on the dirt in the pickling tank; in the process of cleaning the plate heat exchanger, the heat medium is kept to flow in the heat medium pipeline and the plate heat exchanger all the time.
2. The on-line monitoring and automatic cleaning method according to claim 1, wherein a pH on-line detector is installed at the lower side of the acid storage tank, and the pH on-line detector is connected with the signal input end of the control board card; the acid storage tank is characterized in that a water supplementing pipeline and an acid supplementing pipeline are arranged on a liquid inlet of the acid storage tank in parallel, a water supplementing valve is arranged on the water supplementing pipeline, an acid supplementing valve is arranged on the acid supplementing pipeline, and a signal output end of the control board card is respectively connected with the water supplementing valve and the acid supplementing valve.
3. The on-line monitoring and automatic cleaning method according to claim 2, wherein the acid storage tank is further connected with an acid discharge pipeline at a liquid outlet.
4. The on-line monitoring and automatic cleaning method according to claim 3, wherein the acid storage tank is further provided with a circulating branch pipe, two ends of the circulating branch pipe are respectively connected with the outlet of the pickling pump and the acid storage tank, and the circulating branch pipe is provided with a ball valve.
5. The on-line monitoring and automatic cleaning method according to claim 3, wherein a liquid level meter is installed on the acid storage tank, and the liquid level meter is connected with a signal input end of the control board card.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910036270.0A CN109708519B (en) | 2019-01-15 | 2019-01-15 | Plate type heat exchanger dirt resistance on-line monitoring and automatic cleaning system |
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| CN201910036270.0A CN109708519B (en) | 2019-01-15 | 2019-01-15 | Plate type heat exchanger dirt resistance on-line monitoring and automatic cleaning system |
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| CN109708519B true CN109708519B (en) | 2024-03-19 |
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| CN112665449B (en) * | 2020-12-25 | 2022-08-23 | 北京首创环境科技有限公司 | Full-automatic self-cleaning plate type heat exchange device and cleaning control method |
| CN115143835A (en) * | 2022-06-08 | 2022-10-04 | 华能武汉发电有限责任公司 | Cooler control method and device |
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