CN210512844U - Plate heat exchanger pickling system - Google Patents
Plate heat exchanger pickling system Download PDFInfo
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- CN210512844U CN210512844U CN201921326322.XU CN201921326322U CN210512844U CN 210512844 U CN210512844 U CN 210512844U CN 201921326322 U CN201921326322 U CN 201921326322U CN 210512844 U CN210512844 U CN 210512844U
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- heat exchanger
- plate heat
- pickling
- pickling tank
- acid
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The application relates to a cleaning tool for a plate heat exchanger in a synthetic ammonia workshop, in particular to an acid washing system for the plate heat exchanger; the device comprises a plate heat exchanger, a pickling tank, an acid solution tank, a pH meter and an acid concentration meter; the acid solution tank is connected to the pickling tank through an acid inlet pipeline provided with a first valve; the probe of the pH meter and the probe of the acid concentration meter respectively extend into the pickling tank. Due to the implementation of the technical scheme, the acid solution is prepared in the pickling tank, the liquid level with a certain height is established, the acid solution with pressure is sent to the cold inlet of the plate heat exchanger through the pickling pump, and the cleaned acid solution with impurities is discharged from the inlet and the outlet of the plate heat exchanger and is sent back to the pickling tank; the whole cleaning process ensures the pickling quality through a pH meter and an acid concentration meter, the pressure difference between the cold inlet and the cold outlet of the cleaned plate heat exchanger is not more than 0.05MPa, the heat exchange speed is improved, the full-load production condition of a synthetic ammonia system is met, and the cost of newly purchased equipment is saved.
Description
Technical Field
The application relates to a cleaning tool for a plate heat exchanger in a synthetic ammonia workshop, in particular to an acid washing system for the plate heat exchanger.
Background
The plate heat exchanger is a high-efficiency heat exchanger formed by stacking a series of metal sheets with certain corrugated shapes; thin rectangular channels are formed between the various plates through which heat is exchanged. The plate heat exchanger used in the ammonia synthesis workshop does not stop working for 24 hours, the solution flow is low due to the plate blockage of the plate heat exchanger after the plate heat exchanger is used for a period of time, and the cold inlet pressure is 0.6MPa and the cold outlet pressure is 0.3MPa through detection. The heat exchange efficiency is greatly reduced, and the load production of 50 to 75 percent of the current production in a workshop can be met.
The plate heat exchanger is not easy to disassemble and clean, clean water is pumped into the plate heat exchanger through a pump to clean in the prior art, time is consumed, and the cleaning effect is poor. In addition, if the production requirement is not met, the processing cost is greatly increased due to replacement.
Disclosure of Invention
The application aims to provide a plate heat exchanger pickling system which is convenient to clean and excellent in cleaning effect.
The application is realized as follows: the plate heat exchanger acid washing system comprises a plate heat exchanger, an acid washing tank, an acid solution tank, a pH meter and an acid concentration meter; the acid solution tank is connected to the pickling tank through an acid inlet pipeline provided with a first valve; the probe of the pH meter and the probe of the acid concentration meter respectively extend into the pickling tank; the cold inlets of the pickling tank and the plate heat exchanger are connected with a liquid inlet pipeline, a pickling pump and a second valve are installed on the liquid inlet pipeline, and the cold outlet of the plate heat exchanger is connected with a liquid outlet pipeline which can send liquid back to the pickling tank; an inlet pressure valve is arranged on the liquid inlet pipeline close to the cold inlet, and an outlet pressure valve is arranged on the liquid outlet pipeline close to the cold outlet; the pickling tank is connected with an alkaline solution inlet pipeline provided with a third valve, is also connected with a water purification pipeline provided with a fourth valve, and is provided with an emptying pipeline which can be opened and closed at the bottom.
Furthermore, a stirring blade capable of rotating slowly is arranged in the inner cavity of the pickling tank, the acid inlet pipeline is connected to the bottom of the inner cavity of the pickling tank, and the liquid inlet pipeline is connected to the middle of the inner cavity of the pickling tank; an independent filter cavity is arranged in the inner cavity of the pickling tank, the liquid outlet pipeline is connected to the top of the filter cavity, and the bottom of the filter cavity is communicated with the inner cavity of the pickling tank.
Furthermore, at least two layers of stainless steel filter screens are arranged in the filter cavity.
Due to the implementation of the technical scheme, the acid solution is prepared in the pickling tank, the liquid level with a certain height is established, the acid solution with pressure is sent to the cold inlet of the plate heat exchanger through the pickling pump, and the cleaned acid solution with impurities is discharged from the inlet and the outlet of the plate heat exchanger and is sent back to the pickling tank; the whole cleaning process ensures the pickling quality through a pH meter and an acid concentration meter, the pressure difference between the cold inlet and the cold outlet of the cleaned plate heat exchanger is not more than 0.05MPa, the heat exchange speed is improved, the full-load production condition of a synthetic ammonia system is met, and the cost of newly purchased equipment is saved.
Drawings
The specific structure of the application is given by the following figures and examples:
fig. 1 is a schematic structural diagram of a preferred embodiment of the present application.
Legend: 1. the system comprises a plate heat exchanger, 2 a pickling tank, 3 an acid solution tank, 4 a pH meter, 5 an acid concentration meter, 6 a pickling pump, 7 a first valve, 8 an acid inlet pipeline, 9 an acid inlet pipeline, 10 a second valve, 11 a liquid outlet pipeline, 12 an inlet pressure valve, 13 an outlet pressure valve, 14 a third valve, 15 an alkali solution inlet pipeline, 16 a fourth valve, 17 a water purification pipeline, 18 an emptying pipeline, 19 stirring blades, 20 a filter cavity and 21 a stainless steel filter screen.
Detailed Description
The present application is not limited to the following examples, and specific implementations may be determined according to the technical solutions and practical situations of the present application.
In an embodiment, as shown in fig. 1, the plate heat exchanger pickling system comprises a plate heat exchanger 1, a pickling tank 2, an acid solution tank 3, a pH meter 4 and an acid concentration meter 5; the acid solution tank 3 is connected to the pickling tank 2 through an acid inlet pipeline 8 provided with a first valve 7; a probe of the pH meter 4 and a probe of the acid concentration meter 5 respectively extend into the pickling tank 2; the cold inlets of the pickling tank 2 and the plate heat exchanger 1 are connected with a liquid inlet pipeline 9, a pickling pump 6 and a second valve 10 are installed on the liquid inlet pipeline 9, and the cold outlet of the plate heat exchanger 1 is connected with a liquid outlet pipeline 11 capable of returning liquid to the pickling tank 2; an inlet pressure valve 12 is arranged on the liquid inlet pipeline 9 close to the cold inlet, and an outlet pressure valve 13 is arranged on the liquid outlet pipeline 11 close to the cold outlet; the pickling tank 2 is connected with an alkaline solution inlet pipeline 15 provided with a third valve 14, the pickling tank 2 is also connected with a water purifying pipeline 17 provided with a fourth valve 16, and the bottom of the pickling tank 2 is provided with an emptying pipeline 18 which can be opened and closed.
The pH meter 4 is an instrument for measuring the pH value of the solution, and is a well-known and public technology in the prior art. The acid concentration meter 5 is a device for continuously measuring the concentration of a liquid on-line, and is a well-known and publicly known technique.
During working, short joints of a cold inlet and a cold outlet of the plate heat exchanger 1 are detached, and are respectively in butt joint with the liquid inlet pipeline 9 and the liquid outlet pipeline 11; a liquid level of 0.5 m to 1 m is then established in the pickling tank 2. After the process, the first valve 7 is opened, the second valve 10, the third valve 14 and the fourth valve 16 are closed, the nitric acid solution in the acid solution tank 3 is slowly added, the acid concentration in the pickling tank 2 is controlled to be about 10% according to the acid concentration meter 5, and operators need to wear rubber gloves and acid-proof glasses in the whole process when the valves are opened and the nitric acid solution is added. And (3) closing the first valve 7, opening the pickling pump 6 and the second valve 10, and performing circulating cleaning on the plate heat exchanger 1 by using acid solution, wherein the pickling pump 6 is fully opened as much as possible in the circulating cleaning process to perform large-flow circulation. The operator observes the readings of the pH meter 4 and the acid concentration meter 5 every half hour, controls the concentration of the acid solution and ensures the cleaning quality; meanwhile, the operator needs to observe the inlet pressure valve 12 and the outlet pressure valve 13 every half an hour, and the pickling can be finished when the difference value between the inlet pressure valve and the outlet pressure valve is not more than 0.05 MPa. Then the pickling pump 6 and the second valve 10 are closed, the third valve 14 is opened, sodium hydroxide is put into the pickling tank 2 through an alkali solution inlet pipeline 15 for neutralization, and an emptying pipeline 18 is opened for discharge when the pH value of the solution reaches 7 to 9. And finally, closing the third valve 14, opening the pickling pump 6, the second valve 10 and the fourth valve 16, and cleaning the pickling tank 2, the pickling pump 6 and the plate heat exchanger 1 by using purified water.
The whole cleaning time of this application can be controlled within 10 hours, and the cleaning performance is splendid, can reduce plate heat exchanger 1's cold entry, cold export pressure difference to within 5 kilograms, has improved heat transfer speed, satisfies synthetic ammonia system full load production condition, avoids purchasing newly-purchased equipment, reduce cost.
As shown in fig. 1, a stirring blade 19 which can rotate slowly is arranged in the inner cavity of the pickling tank 2, an acid inlet pipeline 8 is connected to the bottom of the inner cavity of the pickling tank 2, and a liquid inlet pipeline 9 is connected to the middle of the inner cavity of the pickling tank 2; an independent filter cavity 20 is arranged in the inner cavity of the pickling tank 2, the liquid outlet pipeline 11 is connected to the top of the filter cavity 20, and the bottom of the filter cavity 20 is communicated with the inner cavity of the pickling tank 2.
As shown in fig. 1, at least two layers of stainless steel filter screens 21 are disposed in the filter cavity 20. Therefore, impurities and dirt cleaned out in the plate heat exchanger 1 can be collected on the stainless steel filter screen 21, on one hand, the circulating cleaning effect of the acid solution is not affected, and on the other hand, the stainless steel filter screen 21 can be removed, cleaned or replaced regularly, so that the plate heat exchanger is quick and convenient.
In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.
The above technical features constitute the best embodiment of the present application, which has strong adaptability and best implementation effect, and unnecessary technical features can be added or subtracted according to actual needs to meet the needs of different situations.
Claims (3)
1. The plate heat exchanger acid pickling system is characterized in that: comprises a plate heat exchanger, a pickling tank, an acid solution tank, a pH meter and an acid concentration meter; the acid solution tank is connected to the pickling tank through an acid inlet pipeline provided with a first valve; the probe of the pH meter and the probe of the acid concentration meter respectively extend into the pickling tank; the cold inlets of the pickling tank and the plate heat exchanger are connected with a liquid inlet pipeline, a pickling pump and a second valve are installed on the liquid inlet pipeline, and the cold outlet of the plate heat exchanger is connected with a liquid outlet pipeline which can send liquid back to the pickling tank; an inlet pressure valve is arranged on the liquid inlet pipeline close to the cold inlet, and an outlet pressure valve is arranged on the liquid outlet pipeline close to the cold outlet; the pickling tank is connected with an alkaline solution inlet pipeline provided with a third valve, is also connected with a water purification pipeline provided with a fourth valve, and is provided with an emptying pipeline which can be opened and closed at the bottom.
2. The plate heat exchanger pickling system of claim 1, wherein: a stirring blade capable of rotating slowly is arranged in the inner cavity of the pickling tank, an acid inlet pipeline is connected to the bottom of the inner cavity of the pickling tank, and a liquid inlet pipeline is connected to the middle of the inner cavity of the pickling tank; an independent filter cavity is arranged in the inner cavity of the pickling tank, the liquid outlet pipeline is connected to the top of the filter cavity, and the bottom of the filter cavity is communicated with the inner cavity of the pickling tank.
3. The plate heat exchanger pickling system of claim 2, wherein: at least two layers of stainless steel filter screens are arranged in the filter cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921326322.XU CN210512844U (en) | 2019-08-15 | 2019-08-15 | Plate heat exchanger pickling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921326322.XU CN210512844U (en) | 2019-08-15 | 2019-08-15 | Plate heat exchanger pickling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210512844U true CN210512844U (en) | 2020-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921326322.XU Active CN210512844U (en) | 2019-08-15 | 2019-08-15 | Plate heat exchanger pickling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210512844U (en) |
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2019
- 2019-08-15 CN CN201921326322.XU patent/CN210512844U/en active Active
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