CN216273191U - Wastewater treatment system capable of prolonging operation period of device - Google Patents
Wastewater treatment system capable of prolonging operation period of device Download PDFInfo
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- CN216273191U CN216273191U CN202122887198.8U CN202122887198U CN216273191U CN 216273191 U CN216273191 U CN 216273191U CN 202122887198 U CN202122887198 U CN 202122887198U CN 216273191 U CN216273191 U CN 216273191U
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Abstract
The utility model belongs to the technical field of acrylonitrile wastewater treatment, and particularly relates to a wastewater treatment system capable of prolonging the operation period of a device, wherein a low-pressure steam line is respectively connected with a first-effect evaporator and a second-effect evaporator, a first-effect feed line is respectively connected with the first-effect evaporator and the second-effect evaporator, the middle part of the first-effect evaporator is connected with the bottom of the first-effect evaporator through a first-effect circulating pump, the first-effect circulating pump is respectively connected with the second-effect evaporator and a third-effect evaporator, and the top of the first-effect evaporator is respectively connected with the second-effect evaporator and the third-effect evaporator; the middle part of the second-effect evaporator is connected with the bottom of the second-effect evaporator through a second-effect circulating pump, the second-effect circulating pump is connected with the third-effect evaporator, and the top of the second-effect evaporator is connected with the third-effect evaporator. The utility model can realize the on-line switching and on-line cleaning of the first effect evaporator and the second effect evaporator, and simultaneously ensures the stability of the switching process by additionally arranging the pressure control valve, the flow control valve and the hydraulic control valve, thereby prolonging the system operation period to more than 2 years.
Description
Technical Field
The utility model belongs to the technical field of acrylonitrile wastewater treatment, and particularly relates to a wastewater treatment system capable of prolonging the operation period of a device.
Background
The production process of acrylonitrile at home and abroad mostly adopts propylene, ammonia and air oxidation methods, and the raw materials of propylene, ammonia and air generate acrylonitrile, hydrocyanic acid, acetonitrile, acrolein, acetone, water and other products under the action of a molybdenum-bismuth catalyst; this reaction produces a large amount of water which is concentrated and sent to a waste water treatment plant or an incineration plant.
The waste water treatment that the acrylonitrile device produced at present in China all adopts the technique of four-effect evaporation, evaporates waste water many times, evaporates therefrom and sends out and can continue by used water and steam repeatedly, reduces the discharge of harmful substance simultaneously. The four effect evaporator system is a interrelated system in that the operation of each effect evaporator is affected by the previous effect evaporator and affects the operation of the next effect evaporator, resulting in a shutdown of the entire system should a reboiler of one effect become clogged.
The operation period of the four-effect evaporation system is generally 6-12 months, wherein the most main factor influencing the operation period is the blockage of the system, particularly, the heat exchange tubes and the mist catching nets of the first-effect evaporator and the second-effect evaporator need to be stopped and disassembled and cleaned by a high-pressure water gun as long as the blockage occurs, and the long-period operation of the whole device is directly influenced by the long-period operation of the four-effect evaporation system, so that the development of an online cleaning technology is very important for ensuring the long-period operation of the four-effect evaporation system.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: overcomes the defects of the prior art, provides a wastewater treatment system which can prolong the running period of the device and reduce the blocking phenomenon, thereby ensuring the stable running of the system.
The utility model is realized by adopting the following technical scheme:
the wastewater treatment system capable of prolonging the operation period of the device comprises a low-pressure steam line, a first-effect feeding line, a first-effect evaporator, a second-effect evaporator and a third-effect evaporator, wherein the low-pressure steam line is respectively connected with the first-effect evaporator and the second-effect evaporator;
the middle part of the second-effect evaporator is connected with the bottom of the second-effect evaporator through a second-effect circulating pump, the second-effect circulating pump is connected with the third-effect evaporator through a second-effect discharge valve, and the top of the second-effect evaporator is connected with the third-effect evaporator;
the middle part of the triple-effect evaporator is connected with the bottom of the triple-effect evaporator through a triple-effect circulating pump, the triple-effect circulating pump is connected with a triple-effect discharging line, and the top of the triple-effect evaporator is connected with a triple-effect steam line.
Preferably, the lower parts of the first-effect evaporator, the second-effect evaporator and the third-effect evaporator are provided with condensate lines.
Preferably, the low-pressure steam line is provided with a flow meter and a steam control valve, and the flow meter is electrically connected with the steam control valve.
Preferably, a first-effect pressure gauge is arranged at a top steam outlet of the first-effect evaporator, and a second-effect pressure gauge is arranged at a top steam outlet of the second-effect evaporator.
Preferably, the single-effect evaporator is provided with a single-effect liquid level meter, and the single-effect liquid level meter is electrically connected with the single-effect discharge valve.
Preferably, a double-effect liquid level meter is arranged on the double-effect evaporator and is electrically connected with the double-effect discharge valve.
Preferably, a dispersant feeding line is arranged on the one-effect feeding line, and the dispersant is added to prevent small-particle polymers from aggregating into a mass, and also disperse large-particle polymers to take most of small-molecule particles away from the system, so that the problem of polymer aggregation in the system is solved.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model can realize the on-line switching and on-line cleaning of the first effect evaporator and the second effect evaporator, and simultaneously ensures the stability of the switching process by additionally arranging the pressure control valve, the flow control valve and the hydraulic control valve, thereby prolonging the system operation period to more than 2 years.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. a low pressure steam line; 2. a first effect feed line; 3. a flow meter; 4. a steam control valve; 5. a first-effect evaporator; 6. a one-effect liquid level meter; 7. a first effect discharge valve; 8. a one-effect circulation pump; 9. a one-effect pressure gauge; 10. a second effect evaporator; 11. a two-effect pressure gauge; 12. a two-effect liquid level meter; 13. a two-effect discharge valve; 14. a two-effect circulating pump; 15. a condensate line; 16. a triple effect evaporator; 17. a three-effect circulating pump; 18. a triple-effect discharging line; 19. a triple effect steam line; 20. a dispersant feed line.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
As shown in fig. 1, the wastewater treatment system capable of prolonging the operation period of the device comprises a low-pressure steam line 1, a first-effect feed line 2, a first-effect evaporator 5, a second-effect evaporator 10 and a third-effect evaporator 16, wherein the low-pressure steam line 1 is respectively connected with the first-effect evaporator 5 and the second-effect evaporator 10, the first-effect feed line 2 is provided with a dispersing agent feed line 20, the first-effect feed line 2 is respectively connected with the first-effect evaporator 5 and the second-effect evaporator 10, the middle part of the first-effect evaporator 5 is connected with the bottom of the first-effect evaporator 5 through a first-effect circulating pump 8, the first-effect circulating pump 8 is respectively connected with the second-effect evaporator 10 and the third-effect evaporator 16 through a first-effect discharge valve 7, and the top of the first-effect evaporator 5 is respectively connected with the second-effect evaporator 10 and the third-effect evaporator 16;
the middle part of the second-effect evaporator 10 is connected with the bottom of the second-effect evaporator 10 through a second-effect circulating pump 14, the second-effect circulating pump 14 is connected with the third-effect evaporator 16 through a second-effect discharge valve 13, and the top of the second-effect evaporator 10 is connected with the third-effect evaporator 16;
the middle part of the triple-effect evaporator 16 is connected with the bottom of the triple-effect evaporator 16 through a triple-effect circulating pump 17, the triple-effect circulating pump 17 is connected with a triple-effect discharging line 18, the triple-effect discharging line 18 is connected with a four-effect evaporator, the top of the triple-effect evaporator 16 is connected with a triple-effect steam line 19, the triple-effect steam line 19 is connected with the four-effect evaporator, the middle part of the four-effect evaporator is connected with the bottom of a tube side of the four-effect evaporator through the four-effect circulating pump, the middle liquid is divided into one path to flow to a downstream waste liquid incineration device through a pump, and the top steam of the four-effect evaporator is connected with a downstream condensation recovery device.
The lower parts of the first-effect evaporator 5, the second-effect evaporator 10 and the third-effect evaporator 16 are all provided with condensate lines 15.
The low-pressure steam line 1 is provided with a flowmeter 3 and a steam control valve 4, and the flowmeter 3 is electrically connected with the steam control valve 4.
A first-effect pressure gauge 9 is arranged at the top steam outlet of the first-effect evaporator 5, and a second-effect pressure gauge 11 is arranged at the top steam outlet of the second-effect evaporator 10.
The first-effect evaporator 5 is provided with a first-effect liquid level meter 6, and the first-effect liquid level meter 6 is electrically connected with a first-effect discharge valve 7.
The double-effect evaporator 10 is provided with a double-effect liquid level meter 12, and the double-effect liquid level meter 12 is electrically connected with a double-effect discharge valve 13.
When the tube pass of the first-effect evaporator 5 or the second-effect evaporator 10 is blocked, the blocked evaporator can be cut off and cleaned, the whole wastewater treatment system is changed into a three-effect evaporation mode from four-effect evaporation, and the integral stable operation is not influenced.
Of course, the foregoing is only a preferred embodiment of the utility model and should not be taken as limiting the scope of the embodiments of the utility model. The present invention is not limited to the above examples, and equivalent changes and modifications made by those skilled in the art within the spirit and scope of the present invention should be construed as being included in the scope of the present invention.
Claims (7)
1. A wastewater treatment system capable of prolonging the operation period of a device is characterized in that: the device comprises a low-pressure steam line (1), a first-effect feed line (2), a first-effect evaporator (5), a second-effect evaporator (10) and a third-effect evaporator (16), wherein the low-pressure steam line (1) is respectively connected with the first-effect evaporator (5) and the second-effect evaporator (10), the first-effect feed line (2) is respectively connected with the first-effect evaporator (5) and the second-effect evaporator (10), the middle part of the first-effect evaporator (5) is connected with the bottom of the first-effect evaporator (5) through a first-effect circulating pump (8), the first-effect circulating pump (8) is respectively connected with the second-effect evaporator (10) and the third-effect evaporator (16) through a first-effect discharge valve (7), and the top part of the first-effect evaporator (5) is respectively connected with the second-effect evaporator (10) and the third-effect evaporator (16);
the middle part of the second-effect evaporator (10) is connected with the bottom of the second-effect evaporator (10) through a second-effect circulating pump (14), the second-effect circulating pump (14) is connected with the third-effect evaporator (16) through a second-effect discharge valve (13), and the top of the second-effect evaporator (10) is connected with the third-effect evaporator (16);
the middle part of the triple-effect evaporator (16) is connected with the bottom of the triple-effect evaporator (16) through a triple-effect circulating pump (17), the triple-effect circulating pump (17) is connected with a triple-effect discharging line (18), and the top of the triple-effect evaporator (16) is connected with a triple-effect steam line (19).
2. The wastewater treatment system capable of extending the operation cycle of a plant according to claim 1, wherein: the lower parts of the first-effect evaporator (5), the second-effect evaporator (10) and the third-effect evaporator (16) are all provided with condensate lines (15).
3. The wastewater treatment system capable of extending the operation cycle of a plant according to claim 1, wherein: the low-pressure steam line (1) is provided with a flowmeter (3) and a steam control valve (4), and the flowmeter (3) is electrically connected with the steam control valve (4).
4. The wastewater treatment system capable of extending the operation cycle of a plant according to claim 1, wherein: a first-effect pressure gauge (9) is arranged at the top steam outlet of the first-effect evaporator (5), and a second-effect pressure gauge (11) is arranged at the top steam outlet of the second-effect evaporator (10).
5. The wastewater treatment system capable of extending the operation cycle of a plant according to claim 1, wherein: an effective liquid level meter (6) is arranged on the effective evaporator (5), and the effective liquid level meter (6) is electrically connected with an effective discharge valve (7).
6. The wastewater treatment system capable of extending the operation cycle of a plant according to claim 1, wherein: a double-effect liquid level meter (12) is arranged on the double-effect evaporator (10), and the double-effect liquid level meter (12) is electrically connected with a double-effect discharge valve (13).
7. The wastewater treatment system capable of extending the operation cycle of a plant according to claim 1, wherein: a dispersant feeding line (20) is arranged on the first effective feeding line (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122887198.8U CN216273191U (en) | 2021-11-22 | 2021-11-22 | Wastewater treatment system capable of prolonging operation period of device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122887198.8U CN216273191U (en) | 2021-11-22 | 2021-11-22 | Wastewater treatment system capable of prolonging operation period of device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216273191U true CN216273191U (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122887198.8U Active CN216273191U (en) | 2021-11-22 | 2021-11-22 | Wastewater treatment system capable of prolonging operation period of device |
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| Country | Link |
|---|---|
| CN (1) | CN216273191U (en) |
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2021
- 2021-11-22 CN CN202122887198.8U patent/CN216273191U/en active Active
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