CN216241438U - MVR vapor compressor's reflux system - Google Patents
MVR vapor compressor's reflux system Download PDFInfo
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- CN216241438U CN216241438U CN202122888372.0U CN202122888372U CN216241438U CN 216241438 U CN216241438 U CN 216241438U CN 202122888372 U CN202122888372 U CN 202122888372U CN 216241438 U CN216241438 U CN 216241438U
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Abstract
The utility model discloses a reflux system of an MVR vapor compressor, which comprises a forced circulation pump, wherein an inlet of the forced circulation pump is connected with a high-salt water pipeline, an outlet of the forced circulation pump is connected with a circulating inlet pipeline of a heat exchanger, a circulating outlet of the heat exchanger is connected with a feed inlet of a separator, a circulating material discharge outlet of the separator is connected with an inlet of the forced circulation pump, a discharge outlet of the separator is connected with a discharge pump, a thickening circulating feed inlet of the separator is connected with an outlet pipeline of the discharge pump, a vapor outlet of the separator is connected with a secondary vapor inlet of the heat exchanger through the vapor compressor, a water outlet of the heat exchanger is connected with a condensed water tank, the condensed water tank is connected with a spray defoaming port of the separator through a circulating pipeline, and a reflux valve or an anti-surge valve is arranged on the circulating pipeline. The utility model sends all the steam with increased enthalpy to the heating chamber of the evaporator to be used as heating steam, namely, the waste heat generated by the roots type steam compressor is fully utilized in the heat exchanger, so that the temperature of the material is raised, and the operation cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of high-salinity sewage and wastewater treatment, and particularly relates to a reflux system of an MVR vapor compressor.
Background
With the strict national requirements on the high-salt wastewater treatment indexes, the MVR forced circulation evaporator is used for treating the high-salt wastewater, and the application is more and more extensive. However, there are different problems with the different types of equipment in which the vapor compressor is used. When the centrifugal vapor compressor works, the flow entering the vapor compressor is not enough to enable the vapor compressor to generate enough pressure, so that the pressure of an external pipeline is greater than the internal pressure of the vapor compressor, serious gas rotating separation occurs in the compressor, gas backflow is caused, a periodic gas oscillation phenomenon, namely surging, is generated in the system, an anti-surging valve is arranged for preventing the phenomenon, when the flow drops to a certain safe lower limit, a bypass valve which flows back to an inlet is automatically opened, the flow passing through the vapor compressor is increased, and the phenomenon that the flow enters a surging area is prevented; however, the hot vapor flowing back can damage the vapor compressor due to the increasing temperature. Roots-type vapor compressors require boiler combustion fuel to provide primary steam or electric steam generators to heat the material, and the steam return system does not fully utilize some of the heat of the secondary steam.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide a reflux system of an MVR vapor compressor, which prevents the centrifugal vapor compressor from surging and damaging the stability of a process system due to insufficient flow; the anti-surge valve of the centrifugal steam compressor is prevented from being opened in the automatic operation process, so that the temperature is gradually increased to damage the steam compressor; the steam with increased enthalpy is completely sent to the heating chamber of the evaporator to be used as heating steam, namely, the waste heat generated by the roots type steam compressor is fully utilized in the heat exchanger, so that the temperature of the material is increased, and the operation cost is reduced.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the utility model provides a MVR vapor compressor's reflux system, including the forced circulation pump, the forced circulation pump entry is connected with high salt water pipe, the forced circulation pump export is connected with heat exchanger circulation inlet pipe, heat exchanger circulation export is connected with the separator feed inlet, separator circulation material discharge gate and forced circulation pump entry linkage, the separator discharge gate is connected with the discharge pump, separator material thickening circulation feed inlet and discharge pump exit pipe connection, separator steam outlet passes through vapor compressor and heat exchanger secondary steam access connection, the heat exchanger outlet is connected with the condensate water jar, the condensate water jar sprays with the separator through the circulating line and removes the foam mouth to be connected, be equipped with the backwash valve on the circulating line or prevent surge valve.
The heat exchanger comprises a tank body, a heat exchange box is arranged in the tank body, a heat exchange tube is arranged in the heat exchange box, the heat exchange tube penetrates through the upper end and the lower end of the heat exchange box, an inlet and an outlet at the two ends of the heat exchange tube are communicated with a circulation inlet and a circulation outlet at the upper end and the lower end of the tank body, the heat exchange box is an airtight space, the upper portion of the heat exchange box is communicated with a secondary steam inlet, a raw steam inlet and a noncondensable gas port on the tank body, and the lower portion of the heat exchange box is communicated with a balance port, a drain port, a noncondensable gas port II and a water outlet on the tank body.
The balance port and the drain port are connected with the condensed water tank through pipelines.
The separator includes the main part, and the main part lower part is equipped with feed inlet, discharge gate, circulation material discharge gate, material thickening circulation feed inlet, and inside whirl demister, the blade demister of having set gradually, the board demister turns over from supreme down of main part, and the feed inlet top is located to the whirl demister, turns over the board demister and locates the main part top, turns over and is equipped with steam outlet on the board demister, sprays to remove the foam mouth and locates the blade demister and turn over in the main part between the board demister.
The cyclone demister comprises a cover cylinder, fan-shaped blades and an intermediate plate, wherein the cover cylinder is an annular plate, the intermediate plate is arranged at the center of the cover cylinder, the fan-shaped blades with a plurality of slopes are arranged between the intermediate plate and the cover cylinder, the fan-shaped blades are arranged at intervals, one ends of the fan-shaped blades are connected with the cover cylinder, the other ends of the fan-shaped blades are connected with the intermediate plate, and the outer side of the cover cylinder is connected with the inner wall of the main body.
Turn over board demister includes the inner tube, the urceolus includes the upper wall, the annular side wall, the lower wall, the inner tube includes the baffle, annular condensation board, the inner tube is located in the urceolus, annular condensation board upper portion and baffle lower part be airtight connection, annular condensation board lower part and urceolus lower wall connection, be equipped with airflow channel between annular condensation board lower part and the urceolus lower wall, urceolus lower wall and intake pipe airtight connection, intake pipe upper portion runs through to inner tube baffle department, be equipped with the interval between intake pipe upper portion and the baffle, the urceolus lateral wall is connected with steam outlet pipeline, the blade demister top is located to the intake pipe lower part, the urceolus lower wall still is connected with condensate pipe.
The utility model has the beneficial effects that:
1) the surge phenomenon of the centrifugal vapor compressor caused by insufficient flow is prevented, and the stability of a process system is damaged; the anti-surge valve of the centrifugal steam compressor is prevented from being opened in the automatic operation process, so that the temperature is gradually increased to damage the steam compressor; the steam with increased enthalpy is completely sent to the heating chamber of the evaporator to be used as heating steam, namely, the waste heat generated by the roots type steam compressor is fully utilized in the heat exchanger, so that the temperature of the material is increased, and the operation cost is reduced.
2) When the material passes through the heat exchanger, the heat of the introduced raw steam is firstly utilized to carry out heat exchange and temperature rise, then the material enters the separator to carry out steam-liquid separation, the generated secondary steam is compressed by the steam compressor, the volume is reduced, the temperature is increased, and then the material is heated by the heat exchanger to be repeatedly circulated. The reflux system is a steam circulation system which is designed into a steam circulation system which is composed of a separator, a steam compressor and a heat exchanger in the original MVR steam compressor reflux system of figure 1 and is composed of a condensation water tank, the separator, the steam compressor and the heat exchanger in the novel MVR steam compressor reflux system of figure 2, and is specifically embodied by changing an inlet and outlet reflux pipeline of the steam compressor, namely a reflux valve in figure 1, into a reflux pipeline of condensed water to the separator, namely a reflux valve in figure 2.
3) Centrifugal vapor compressors have only spray water at the outlet, but operating characteristics dictate that the outlet is not cooled sufficiently, and the temperature of the returning vapor is still high, leading to failure of the vapor compressor due to overheating. In order to prevent surging, the flow is kept not to enter a surging area, and when the flow is reduced to a certain safe lower limit, an anti-surging valve can be automatically opened, so that part of steam flows back to maintain the flow within the limited minimum flow.
4) In the roots type steam compressor waste heat utilization system, the boiler combustion fuel is not needed to provide primary steam or an electric steam generator to heat materials, but the waste heat of the steam compressor is directly utilized. In the novel MVR vapor compressor reflux system shown in figure 2, when the vapor compressor is started, the reflux valve is fully opened to ensure that the empty load is started, the heat generated when the vapor compressor is started is utilized to heat the vapor, the heated vapor transfers part of the heat to the cold material in the heat exchanger to heat the material, part of the vapor forms non-condensed steam to be discharged, part of the vapor is cooled to form condensed water to be conveyed to the condensed water tank, a pipeline for conveying the condensed water is thickened, part of the non-liquefied vapor is also conveyed to the condensed water tank, the condensed water is treated to be discharged, the vapor is conveyed to the separator through the pipeline provided with the reflux valve to carry out vapor-liquid separation, the secondary vapor generated by the separator is compressed by the vapor compressor to form a circulating system, the reflux valve is adjusted to change the pipeline pressure, the separator temperature is higher and higher, the heat generated by the rear vapor compressor is more and more quickly heated, until the steam compressor normally operates, the valve is closed.
Drawings
FIG. 1 is a schematic of the prior art vapor compressor reflux system.
FIG. 2 is a schematic view of a reflux system of an MVR vapor compressor according to the present invention.
FIG. 3 is a schematic diagram of a heat exchanger according to the present invention.
FIG. 4 is a schematic of the separator of the present invention.
FIG. 5 is a schematic view of the cyclone demister of the present invention.
FIG. 6 is a schematic view of the flap demister of the present invention.
In the figure, 1, a separator; 2. a vapor compressor; 3. a heat exchanger; 4. a forced circulation pump; 5. a condensate tank; 6. a discharge pump; 7. a reflux valve; 8. a recycle outlet; 9. a secondary steam inlet; 10. a balancing port; 11. a steam outlet; 12. a plate turnover demister; 13. a blade demister; 14. a cyclone demister; 15. a main body; 16. a discharge port for circulating materials; 17. a feed inlet; 18. a material thickening circulation feed inlet; 19. a discharge port; 20. a middle plate; 21. a fan-shaped blade; 22. a cover cylinder; 23. a discharge port; 24. a baffle plate; 25. an upper wall; 26. an annular sidewall; 27. a lower wall; 28. an annular condensing plate; 29. an air inlet pipe; 30. a condensed water pipeline; 31. a circulation inlet; 32. a water outlet; 33. a noncondensable gas port II; 34. a raw steam inlet; 35. a non-condensing gas port I; 36. a heat exchange box; 37. a tank body; 38. a heat exchange pipe; 39. spraying a defoaming port;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Example 1
Referring to fig. 1-6, a reflux system of MVR vapor compressor 2, including forced circulation pump 4, the inlet of forced circulation pump 4 is connected with the high salt water pipeline, the outlet of forced circulation pump 4 is connected with the inlet 31 of heat exchanger 3, the outlet 8 of heat exchanger 3 is connected with the inlet 17 of separator 1, the outlet 16 of separator 1 circulating material is connected with the inlet of forced circulation pump 4, the outlet 19 of separator 1 is connected with the discharge pump 6, the outlet 18 of separator 1 material thickening circulation is connected with the outlet pipeline of discharge pump 6, the outlet 11 of separator 1 vapor is connected with the inlet 9 of heat exchanger 3 secondary vapor through vapor compressor 2, the outlet 32 of heat exchanger 3 is connected with the condensate water tank 5, the condensate water tank 5 is connected with the spray defoaming port 39 of separator 1 through the circulation pipeline, the circulation pipeline is provided with reflux valve 7 or anti-surge valve.
The heat exchanger 3 comprises a tank body 37, a heat exchange box 36 is arranged in the tank body 37, a heat exchange pipe 38 is arranged in the heat exchange box 36, the heat exchange pipe 38 penetrates through the upper end and the lower end of the heat exchange box 36, an inlet and an outlet at the two ends of the heat exchange pipe 38 are communicated with a circulation inlet 31 and a circulation outlet 8 at the upper end and the lower end of the tank body 37, the heat exchange box 36 is a closed space, the upper part of the heat exchange box 36 is communicated with a secondary steam inlet 9, a raw steam inlet 34 and a non-condensing port 35 on the tank body 37, and the lower part of the heat exchange box 36 is communicated with a balance port 10, a drain port 23, a non-condensing port 33 and a drain port 32 on the tank body 37.
The balance port 10 and the drain port 23 are connected with the condensate tank 5 through pipes.
The cyclone demister 14 comprises a cover cylinder 22, fan-shaped blades 21 and an intermediate plate 20, the cover cylinder 22 is an annular plate, the intermediate plate 20 is arranged at the center of the cover cylinder 22, a plurality of inclined fan-shaped blades 21 are arranged between the intermediate plate 20 and the cover cylinder 22, the fan-shaped blades 21 are arranged at intervals, one end of each fan-shaped blade 21 is connected with the cover cylinder 22, the other end of each fan-shaped blade 21 is connected with the intermediate plate 20, and the outer side of the cover cylinder 22 is connected with the inner wall of the main body 15.
Turning over board demister 12 includes the inner tube, the urceolus includes upper wall 25, annular lateral wall 26, lower wall 27, the inner tube includes baffle 24, annular condensation plate 28, the inner tube is located in the urceolus, annular condensation plate 28 upper portion and baffle 24 lower part sealing connection, annular condensation plate 28 lower part is connected with urceolus lower wall 27, be equipped with airflow channel between annular condensation plate 28 lower part and the urceolus lower wall 27, urceolus lower wall 27 and intake pipe 29 sealing connection, intake pipe 29 upper portion runs through to inner tube baffle 24 department, be equipped with the interval between intake pipe 29 upper portion and the baffle 24, the urceolus lateral wall and 11 pipe connection of steam outlet, blade demister 13 tops is located to intake pipe 29 lower part, urceolus lower wall 27 still is connected with condensate pipe 30.
The surge phenomenon of the centrifugal vapor compressor 2 caused by insufficient flow is prevented, and the stability of a process system is damaged; the anti-surge valve of the centrifugal vapor compressor 2 is prevented from being opened in the automatic operation process, so that the temperature is gradually increased to damage the vapor compressor 2; the steam with increased enthalpy is completely sent to the heating chamber of the evaporator to be used as heating steam, namely, the waste heat generated by the roots type steam compressor 2 is fully utilized in the heat exchanger 3, so that the temperature of the material is increased, and the operation cost is reduced.
When the material passes through the heat exchanger 3, the heat of the introduced raw steam is firstly utilized to carry out heat exchange and temperature rise, then the material enters the separator 1 to carry out steam-liquid separation, the generated secondary steam is compressed by the steam compressor 2, the volume is reduced, the temperature is increased, and then the material is heated by the heat exchanger 3 to be repeatedly circulated. The reflux system is a steam circulation system consisting of a separator 1, a steam compressor 2 and a heat exchanger 3 in the original MVR steam compressor 2 reflux system of FIG. 1, is designed into a steam circulation system consisting of a condensate water tank 5, the separator 1, the steam compressor 2 and the heat exchanger 3 in the novel MVR steam compressor 2 reflux system of FIG. 2, and is specifically embodied by changing an inlet and outlet reflux pipeline of the steam compressor 2, namely a reflux valve 7 in FIG. 1, into a reflux pipeline of condensed water to the separator 1, namely the reflux valve 7 in FIG. 2.
The centrifugal vapor compressor 2 is provided with spray water only at the outlet, but the operating properties determine that the outlet is insufficiently cooled, and the temperature of the return vapor is still high, which may cause the vapor compressor 2 to malfunction due to overheating. In order to prevent surging, the flow is kept not to enter a surging area, and the anti-surging valve can be automatically opened when the flow is reduced to a certain safe lower limit, so that part of steam flows back to maintain the flow within the limited minimum flow, but in the centrifugal steam compressor 2 operation protection system of the design, secondary steam which is compressed by the steam compressor 2 and heated up does not directly flow back to the inlet of the steam compressor 2, but is conveyed to the heat exchanger 3 to exchange heat with materials to reduce the temperature, and then is circulated to the inlet of the steam compressor 2 through the condensate water tank 5 and the separator 1, and the circulation mode not only prevents surging, but also protects the normal operation of the centrifugal machine.
In the waste heat utilization system of the Roots type steam compressor 2, the waste heat of the steam compressor 2 is directly utilized without providing primary steam or heating materials of an electric steam generator by using boiler combustion fuel. In the novel MVR vapor compressor 2 reflux system shown in figure 2, a reflux valve 7 is fully opened when a vapor compressor 2 is started, so that the empty load is ensured to be started, the heat generated when the vapor compressor 2 is started is utilized to heat the vapor, the heated vapor transfers part of the heat to cold materials in a heat exchanger 3, so that the materials are heated, part of the vapor is discharged without condensing, part of the vapor is cooled to form condensed water, the condensed water is conveyed to a condensed water tank 5, a pipeline for conveying the condensed water is thickened, part of the non-liquefied vapor is also conveyed to the condensed water tank 5, the condensed water is discharged after treatment, the vapor is conveyed to a separator 1 through a pipeline provided with the reflux valve 7 to perform vapor-liquid separation, secondary vapor generated by the separator 1 is compressed by the vapor compressor 2 to form a circulating system, the reflux valve 7 is adjusted to change the pipeline pressure, the temperature of the separator 1 is higher and higher, and more heat are generated by the vapor compressor 2 slowly, the heating is faster and faster until the steam compressor 2 operates normally and the valve is closed.
The foregoing is merely exemplary and illustrative of the present invention, and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the utility model as defined in the accompanying claims.
Claims (6)
1. The utility model provides a MVR vapor compressor's reflux system, including the forced circulation pump, the forced circulation pump entry is connected with high salt solution pipe, the forced circulation pump export is connected with heat exchanger circulation inlet pipe, heat exchanger circulation export is connected with the separator feed inlet, separator circulation material discharge gate and forced circulation pump entry linkage, the separator discharge gate is connected with the discharge pump, separator material thickening circulation feed inlet and discharge pump exit pipe connection, separator steam outlet passes through vapor compressor and heat exchanger secondary steam access connection, the heat exchanger outlet is connected with the condensate water jar, characterized by, the condensate water jar sprays with the separator through the circulating line and removes the foam mouthful and be connected, be equipped with the backwash valve on the circulating line or prevent surge valve.
2. The reflux system of MVR vapor compressor as claimed in claim 1, wherein the heat exchanger comprises a tank, a heat exchange box is disposed in the tank, a heat exchange tube is disposed in the heat exchange box, the heat exchange tube penetrates through the upper and lower ends of the heat exchange box, the inlet and outlet at the two ends of the heat exchange tube are communicated with the circulation inlet and the circulation outlet at the upper and lower ends of the tank, the heat exchange box is a closed space, the upper part of the heat exchange box is communicated with the first secondary vapor inlet, the first raw vapor inlet and the first non-condensable gas port on the tank, and the lower part of the heat exchange box is communicated with the balance port, the drain port, the second non-condensable gas port and the drain port on the tank.
3. The reflux system of an MVR vapor compressor as claimed in claim 2, wherein the balance port and the drain port are connected to the condensate tank through pipes.
4. The reflux system of MVR vapor compressor as claimed in claim 1, wherein the separator comprises a main body, the lower part of the main body is provided with a feed inlet, a discharge outlet of circulating material, and a material thickening circulating feed inlet, the main body is internally provided with a cyclone demister, a blade demister, and a flap demister in sequence from bottom to top, the cyclone demister is arranged above the feed inlet, the flap demister is arranged at the top of the main body, the flap demister is provided with a vapor outlet, and the spraying demister is arranged on the main body between the blade demister and the flap demister.
5. The backflow system of an MVR vapor compressor as claimed in claim 4, wherein the cyclone demister comprises a cover cylinder, a plurality of fan-shaped blades, and an intermediate plate, wherein the cover cylinder is an annular plate, the intermediate plate is disposed at the center of the cover cylinder, a plurality of inclined fan-shaped blades are disposed between the intermediate plate and the cover cylinder, the fan-shaped blades are spaced from each other, one end of each fan-shaped blade is connected with the cover cylinder, the other end of each fan-shaped blade is connected with the intermediate plate, and the outer side of the cover cylinder is connected with the inner wall of the main body.
6. The reflux system of MVR vapor compressor as claimed in claim 4, wherein the plate-turning demister comprises an inner tube and an outer tube, the outer tube comprises an upper wall, an annular side wall and a lower wall, the inner tube comprises a baffle plate and an annular condensation plate, the inner tube is arranged in the outer tube, the upper part of the annular condensation plate is hermetically connected with the lower part of the baffle plate, the lower part of the annular condensation plate is connected with the lower wall of the outer tube, an air flow channel is arranged between the lower part of the annular condensation plate and the lower wall of the outer tube, the lower wall of the outer tube is hermetically connected with an air inlet pipe, the upper part of the air inlet pipe penetrates through the baffle plate of the inner tube, a gap is arranged between the upper part of the air inlet pipe and the baffle plate, the side wall of the outer tube is connected with a vapor outlet pipeline, the lower part of the air inlet pipe is arranged above the blade demister, and the lower wall of the outer tube is further connected with a condensed water pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122888372.0U CN216241438U (en) | 2021-11-22 | 2021-11-22 | MVR vapor compressor's reflux system |
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| CN202122888372.0U CN216241438U (en) | 2021-11-22 | 2021-11-22 | MVR vapor compressor's reflux system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115798768A (en) * | 2023-01-04 | 2023-03-14 | 中国原子能科学研究院 | Radioactive waste liquid treatment method and system |
| CN115810435A (en) * | 2023-01-04 | 2023-03-17 | 中国原子能科学研究院 | Radioactive waste liquid treatment method and system |
| CN116092717A (en) * | 2023-01-04 | 2023-05-09 | 中国原子能科学研究院 | Radioactive waste liquid treatment method and system |
| CN116771712A (en) * | 2023-08-23 | 2023-09-19 | 中粮生化(成都)有限公司 | Anti-asthma driving system and method for centrifugal compressor |
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2021
- 2021-11-22 CN CN202122888372.0U patent/CN216241438U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115798768A (en) * | 2023-01-04 | 2023-03-14 | 中国原子能科学研究院 | Radioactive waste liquid treatment method and system |
| CN115810435A (en) * | 2023-01-04 | 2023-03-17 | 中国原子能科学研究院 | Radioactive waste liquid treatment method and system |
| CN116092717A (en) * | 2023-01-04 | 2023-05-09 | 中国原子能科学研究院 | Radioactive waste liquid treatment method and system |
| CN115798768B (en) * | 2023-01-04 | 2024-03-22 | 中国原子能科学研究院 | Radioactive waste liquid treatment method and system |
| CN116092717B (en) * | 2023-01-04 | 2024-05-14 | 中国原子能科学研究院 | Radioactive waste liquid treatment method and system |
| CN115810435B (en) * | 2023-01-04 | 2024-05-14 | 中国原子能科学研究院 | Radioactive waste liquid treatment method and system |
| CN116771712A (en) * | 2023-08-23 | 2023-09-19 | 中粮生化(成都)有限公司 | Anti-asthma driving system and method for centrifugal compressor |
| CN116771712B (en) * | 2023-08-23 | 2023-10-24 | 中粮生化(成都)有限公司 | Anti-asthma driving system and method for centrifugal compressor |
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