CN218833583U - MVR system of high-efficient heat transfer - Google Patents
MVR system of high-efficient heat transfer Download PDFInfo
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- CN218833583U CN218833583U CN202223236580.3U CN202223236580U CN218833583U CN 218833583 U CN218833583 U CN 218833583U CN 202223236580 U CN202223236580 U CN 202223236580U CN 218833583 U CN218833583 U CN 218833583U
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Abstract
The utility model discloses a MVR system of high-efficient heat transfer, it mixes in the steam liquefier through the distillate after with cooling down in vapor compressor exhaust high temperature high pressure steam and the main heat exchanger, realizes steam and distillate direct contact, and steam rapid condensation, distillate rapid heating up pass through the distillate circulating pump again and carry to the hot side of main heat exchanger, realize the cyclic utilization of high temperature distillate. And the input stock solution carries out forced convection heat exchange with the high-temperature distillate in the main heat exchanger, and a liquid-liquid heat exchange mode is adopted, so that compared with the gas-liquid heat exchange mode of the existing MVR system, the heat transfer coefficient is greatly improved, the heat exchange area is saved, the quality and the occupied space of the main heat exchanger are greatly reduced, the cost and the later maintenance difficulty are reduced, the heat exchange distribution is more uniform, the main heat exchanger is not easy to scale, the cleaning period is longer, and the working efficiency of the system is improved.
Description
Technical Field
The utility model relates to a MVR technical field of system especially relates to a MVR system of high-efficient heat transfer.
Background
The principle of the Mechanical Vapor Recompression (MVR) technology is to compress the secondary Vapor generated by evaporation by a high-energy-efficiency Vapor compressor, convert electric energy into heat energy, increase the enthalpy of the secondary Vapor, and pump the secondary Vapor with increased heat energy into a heat exchanger for heating, so as to recycle the existing heat energy of the secondary Vapor, thereby achieving the purpose of evaporation and concentration without external fresh Vapor through self-circulation. The MVR system has the advantages of good energy-saving effect, short product retention time, high automation degree, simple process, small engineering investment and the like, and is widely applied to the aspects of zero discharge of chemical wastewater, organic concentration of sugar alcohol, concentration of pharmaceutical intermediates, utilization of rectification exhaust steam and the like. As shown in fig. 1, the working process of the conventional MVR system is as follows: the raw liquid is preheated by a preheating heat exchanger, is converged with the concentrated liquid flowing out of the bottom of a crystallization separator, is conveyed to a main heat exchanger by a material circulating pump to absorb heat and then is heated, and then is conveyed to the crystallization separator to be flashed and release heat to generate steam, a steam compressor extracts steam to compress and improve enthalpy value and then conveys the steam to the main heat exchanger to release heat, the steam is conveyed to a gas-liquid separator to be subjected to noncondensable gas separation after being condensed, a distillate collecting tank collects the distillate, a distillate pump extracts the distillate to the preheating heat exchanger to be cooled and then is discharged out of a system, and the distillate enters a subsequent process link, and the concentrated liquid is discharged from a pipeline at the bottom of the crystallization separator to the subsequent process link.
Therefore, the main heat exchanger of the existing MVR system adopts a gas-liquid heat exchange mode, latent heat is released through vapor phase change to heat solution, under the heat exchange mode, the flow rate of front-section vapor is high, the heat exchange amount is large, the heat transfer coefficient is high, the flow rate of middle-section and rear-section vapor gradually decreases to a stagnation state, the vapor phase change of the upper part condenses to produce liquid, liquid drops cover the heat transfer surface of the rear half part under the action of gravity in a self-flowing manner, the vapor condensation is blocked, the heat transfer coefficient of the rear-section part is extremely low, and in order to guarantee the heat exchange effect, the heat exchange area of the main heat exchanger needs to be increased, so that the weight and the occupied space of the main heat exchanger are large, and the investment cost and the operation and maintenance cost are increased. In addition, the phase-change heat exchange area of the main heat exchanger is easy to overheat, heat exchange is uneven, so that cold-side feed liquid is easy to salt and scale, frequent cleaning is needed, and the working efficiency is low. In addition, in order to improve the heat transfer coefficient of the cold side of the main heat exchanger, the cold side needs to provide enough flow velocity to form turbulence, meanwhile, the temperature rise of the feed liquid of the cold side is limited, and large circulation flow needs to be provided to absorb heat energy released by steam, so that the flow of the material circulation pump is large, and the power consumption is high, and the cavitation allowance is large. Meanwhile, the temperature of the evaporated feed liquid is close to a saturated state, and in order to avoid cavitation of a material circulating pump, the pressure of an inlet of the pump needs to be raised by raising the height value of an evaporation liquid level, so that a crystallization separator needs to be installed at a high position, and the occupied space of the whole MVR system is large.
SUMMERY OF THE UTILITY MODEL
The utility model provides a MVR system of high-efficient heat transfer to the main heat exchanger of solving current MVR system is because the heat transfer coefficient who adopts gas-liquid heat transfer mode to exist is low, take up an area of the technical problem that the space is big, the heat transfer is uneven, easy scale deposit.
According to the utility model discloses an aspect provides a MVR system of high-efficient heat transfer, including steam liquefaction ware, steam compressor, distillate circulating pump, main heat exchanger, former liquid pump, crystal separation ware and vapour and liquid separator, steam compressor sets up on the steam liquefaction ware's steam inlet and vapour and liquid separator's the steam outlet connected's pipeline, the distillate circulating pump sets up on the distillate outlet of steam liquefaction ware and the hot side entry linkage's of main heat exchanger pipeline, and the distillate inlet of steam liquefaction ware and the hot side exit linkage of main heat exchanger, former liquid pump and the cold side entry linkage of main heat exchanger, the cold side export of main heat exchanger and crystal separation ware's first liquid phase entry linkage, the high temperature high pressure steam that steam compression ware discharged mixes with the distillate after cooling in the main heat exchanger, high temperature high pressure steam rapid condensation, and the high temperature distillate of formation carries out forced convection heat transfer with the former liquid of input in transporting to main heat exchanger after the liquid circulating pump pressurization.
Further, the distillation liquid heat exchanger further comprises a distillate storage tank, and an inlet of the distillate storage tank is connected with a hot side outlet of the main heat exchanger.
The system further comprises a regulating valve which is arranged on a pipeline connecting an inlet of the distillate storage tank with an outlet of the hot side of the main heat exchanger and is used for regulating the discharge flow of the distillate so as to keep the liquid level in the steam liquefier stable.
Further, still include first liquid level detection device and controller, first liquid level detection device sets up in the steam liquefier, first liquid level detection device and governing valve all with controller electric connection, the controller is used for controlling the aperture of governing valve according to first liquid level detection device's liquid level detection result to make the liquid level in the steam liquefier remain stable.
Further, the first liquid level detection device is a liquid level meter or a liquid level sensor.
And further, the distillation system also comprises a preheating heat exchanger, a hot side inlet of the preheating heat exchanger is connected with an outlet of the distillate storage tank, a distillate discharge pump is arranged on a pipeline connected with the hot side inlet of the preheating heat exchanger and the outlet of the distillate storage tank, a cold side inlet of the preheating heat exchanger is connected with the raw liquid pump, and a cold side outlet of the preheating heat exchanger is connected with a cold side inlet of the main heat exchanger.
Further, still including setting up the second liquid level detection device in the distillate holding vessel, second liquid level detection device and distillate discharge pump all with controller electric connection, the controller still is used for controlling the distillate discharge pump to open when the liquid level that second liquid level detection device detected in the distillate holding vessel is higher than the first threshold value, is used for controlling the distillate discharge pump to close when the liquid level that second liquid level detection device detected in the distillate holding vessel is less than the second threshold value.
Furthermore, a concentrated solution discharge pipeline of the crystallization separator is also connected with a cold side inlet of the main heat exchanger through a circulating pipeline, a concentrated solution circulating pump is arranged on the circulating pipeline, and the circulating concentrated solution is mixed with the input stock solution and then carries out forced convection heat exchange with the high-temperature distillate in the main heat exchanger.
Further, the second liquid-phase inlet of the crystallization separator is also connected with the liquid-phase outlet of the gas-liquid separator.
Further, the main heat exchanger is a plate heat exchanger.
The utility model discloses has following effect:
the utility model discloses a MVR system of high-efficient heat transfer, through mixing the distillate after cooling down in steam compressor exhaust high temperature high pressure steam and the main heat exchanger in the steam liquefier, realize steam and distillate direct contact, steam rapid condensation, the distillate rapid heating up passes through the hot side that the distillate circulating pump carried to the main heat exchanger again, realizes the cyclic utilization of high temperature distillate. And the input stock solution carries out forced convection heat exchange with the high-temperature distillate in the main heat exchanger, and a liquid-liquid heat exchange mode is adopted, so that compared with the gas-liquid heat exchange mode of the existing MVR system, the heat transfer coefficient is greatly improved, the heat exchange area is saved, the quality and the occupied space of the main heat exchanger are greatly reduced, the cost and the later maintenance difficulty are reduced, the heat exchange distribution is more uniform, the main heat exchanger is not easy to scale, the cleaning period is longer, and the working efficiency of the system is improved.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
fig. 1 is a schematic diagram of a conventional MVR system.
Fig. 2 is a schematic diagram of an MVR system with high heat exchange efficiency according to a preferred embodiment of the present invention.
Description of the reference numerals
1. A vapor liquefier; 2. a vapor compressor; 3. a distillate circulation pump; 4. a primary heat exchanger; 5. a stock solution pump; 6. a crystallization separator; 7. a gas-liquid separator; 8. a distillate storage tank; 9. adjusting a valve; 10. preheating a heat exchanger; 11. a distillate discharge pump; 12. and a concentrated solution circulating pump.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered below.
As shown in fig. 2, the preferred embodiment of the utility model provides a MVR system of high-efficient heat transfer, it includes vapor liquefaction ware 1, vapor compressor 2, distillate circulating pump 3, main heat exchanger 4, primary liquid pump 5, crystallization separator 6 and vapour and liquid separator 7, vapor compressor 2 sets up on the pipeline of vapor inlet and the steam outlet connection of vapour and liquid separator 7 of vapor liquefaction ware 1 for pressurize the steam after the double-phase separation in the vapour and liquid separator 7, carry high temperature high pressure steam to in the vapor liquefaction ware 1. The distillate circulating pump 3 is arranged on a pipeline connecting a distillate outlet of the steam liquefier 1 with a hot side inlet of the main heat exchanger 4, a distillate inlet of the steam liquefier 1 is connected with a hot side outlet of the main heat exchanger 4, high-temperature high-pressure steam discharged by the steam compressor 2 is mixed with the distillate cooled in the main heat exchanger 4 in the steam liquefier 1, direct contact between the steam and the distillate is realized, the steam is rapidly condensed, the distillate is rapidly heated and then is conveyed to the hot side of the main heat exchanger 4 through the distillate circulating pump 3, and the high-temperature distillate flows at a high speed at the hot side of the main heat exchanger 4 and performs forced convection heat exchange with a cold side medium. The raw liquid pump 5 is connected with a cold side inlet of the main heat exchanger 4, a cold side outlet of the main heat exchanger 4 is connected with a first liquid phase inlet of the crystallization separator 6, the input raw liquid performs forced convection heat exchange with high-temperature distillate in the main heat exchanger 4, the raw liquid enters the crystallization separator 6 after heat exchange to perform evaporation concentration, steam generated by evaporation enters the gas-liquid separator 7 to perform two-phase separation, and the concentrated solution is discharged through a concentrated solution discharge pipeline at the bottom of the crystallization separator 6.
It can be understood that the MVR system of high-efficient heat transfer of this embodiment mixes in vapour liquefier 1 through the distillate after with the cooling in 2 exhaust high temperature high pressure steam of steam compressor and the main heat exchanger 4, realizes steam and distillate direct contact, and the steam condenses fast, and the distillate rapid heating passes through distillate circulating pump 3 and carries to the hot side of main heat exchanger 4 again, realizes the cyclic utilization of high temperature distillate. And the input stock solution carries out forced convection heat exchange with the high-temperature distillate in the main heat exchanger 4, and a liquid-liquid heat exchange mode is adopted, so that compared with the gas-liquid heat exchange mode of the existing MVR system, the heat transfer coefficient is greatly improved, the heat exchange area is saved, the quality and the occupied space of the main heat exchanger 4 are greatly reduced, the cost and the later maintenance difficulty are reduced, in addition, the heat exchange distribution is more uniform, the main heat exchanger 4 is not easy to scale, the cleaning period is longer, and the working efficiency of the system is improved.
Optionally, since the main heat exchanger 4 adopts a liquid-liquid heat exchange mode, the main heat exchanger 4 is preferably a plate heat exchanger to further ensure the heat exchange effect. Of course, in other embodiments, other types of heat exchangers known in the art, such as tube heat exchangers, floating head heat exchangers, and the like, may be used. Taking a plate heat exchanger as an example, if a gas-liquid heat exchange mode is adopted, the total heat transfer coefficient of the plate heat exchanger is 1000W/m 2 /℃～2000W/m 2 Between/° c; if a liquid-liquid heat exchange mode is adopted, the total heat transfer coefficient can reach 3000W/m according to the handbook of engineering design of plate heat exchanger 2 /℃～7000W/m 2 /° c, which is much higher than the gas-liquid heat exchange mode. Therefore, the main heat exchanger 4 of this embodiment adopts a liquid-liquid heat exchange mode, and compared with the existing gas-liquid heat exchange mode, the total heat transfer coefficient can be improved by 2 to 3 times on the premise of the same fouling coefficient.
Optionally, the MVR system with high heat exchange efficiency further comprises a distillate storage tank 8, and an inlet of the distillate storage tank 8 is connected to a hot side outlet of the main heat exchanger 4, so that part of the distillate in circulation can be discharged as required, so as to ensure that the liquid level in the vapor liquefier 1 is kept relatively stable.
Preferably, the MVR system with high heat exchange efficiency further includes a regulating valve 9, which is disposed on a pipeline connecting an inlet of the distillate storage tank 8 and a hot side outlet of the main heat exchanger 4, and is used for regulating the discharge flow of the distillate so as to keep the liquid level in the vapor liquefier 1 stable. It will be appreciated that the discharge flow of distillate can be adjusted in real time by controlling the opening of the regulating valve 9 so that the flow of circulating distillate remains relatively constant and so that the liquid level within the vapour liquefier 1 remains relatively constant. For example, as the high-temperature and high-pressure steam is continuously introduced into the steam liquefier 1 to be condensed, the flow of the circulating distillate is continuously increased, the liquid level in the steam liquefier 1 is also continuously increased, the regulating valve 9 can be controlled to be opened, and the discharge flow of the distillate is regulated in real time by controlling the opening degree of the regulating valve 9, so that the circulating balance of the distillate is realized. Wherein, the regulating valve 9 is an electric regulating valve.
Further preferred, MVR system of high-efficient heat transfer still includes first liquid level detection device and controller, first liquid level detection device sets up in vapour liquefier 1, first liquid level detection device and governing valve 9 all with controller electric connection, the controller is used for controlling the aperture of governing valve 9 according to first liquid level detection device's liquid level detection result to make the liquid level in the vapour liquefier 1 remain stable. For example, when the first liquid level detection device detects that the liquid level in the vapor liquefier 1 is higher than the preset level value, the opening degree of the regulating valve 9 is increased, and when the first liquid level detection device detects that the liquid level in the vapor liquefier 1 is lower than the preset level value, the opening degree of the regulating valve 9 is decreased, and through continuous regulation, dynamic balance is finally achieved, namely the newly increased flow rate of the distillate condensed by the vapor in the vapor liquefier 1 is equivalent to the flow rate of the distillate discharged through the regulating valve 9. Wherein, the first liquid level detection device is a liquid level meter or a liquid level sensor.
Optionally, the MVR system for efficient heat exchange further includes a preheating heat exchanger 10, a hot side inlet of the preheating heat exchanger 10 is connected to an outlet of the distillate storage tank 8, a distillate discharge pump 11 is disposed on a pipeline connecting the hot side inlet and the distillate storage tank, a cold side inlet of the preheating heat exchanger 10 is connected to the raw liquid pump 5, and a cold side outlet thereof is connected to a cold side inlet of the main heat exchanger 4. The distillate stored in the distillate storage tank 8 is introduced into the preheating heat exchanger 10 to exchange heat with the introduced stock solution in advance, so that heat energy recovery is realized, the cooled distillate is discharged outside through a cold side outlet of the preheating heat exchanger 10, and the heated stock solution enters the main heat exchanger 4 to exchange heat again.
Optionally, the MVR system of high-efficient heat transfer still includes the second liquid level detection device of setting in distillate storage jar 8, second liquid level detection device and distillate discharge pump 11 all with controller electric connection, the controller is still used for controlling distillate discharge pump 11 to open when the second liquid level detection device detects that the liquid level in distillate storage jar 8 is higher than first threshold value, is used for controlling distillate discharge pump 11 to close when the second liquid level detection device detects that the liquid level in distillate storage jar 8 is less than the second threshold value to realize distillate discharge pump 11's automatic start-stop control, prevent to appear pumping empty phenomenon.
Optionally, the concentrated solution discharge pipeline of the crystallization separator 6 is further connected with the cold side inlet of the main heat exchanger 4 through a circulation pipeline, a concentrated solution circulation pump 12 is arranged on the circulation pipeline, and the circulated concentrated solution is mixed with the input stock solution and then performs forced convection heat exchange with the high-temperature distillate in the main heat exchanger 4. It can be understood that the small part of the concentrate that produces after the flash distillation in the crystallization separator 6 is discharged through concentrate discharge line, and most of concentrate then carries to the cold side of main heat exchanger 4 through concentrate circulating pump 12 pressurization, carries out the flash distillation again after the heat transfer once more, has realized the circulation of concentrate and has handled, has improved the evaporation concentration effect. In addition, because the main heat exchanger 4 adopts a liquid-liquid heat exchange mode, the heat exchange area is saved by more than 50%, so that the total sectional area of a flow passage is reduced by more than 50%, and the circulating flow is reduced by more than half under the same turbulent flow speed requirement, so that the power consumption of the concentrated solution circulating pump 12 is effectively reduced, the cavitation margin is reduced, the pressure requirement on the inlet of the concentrated solution circulating pump 12 is reduced, and the crystallization separator 6 can be installed at a low position.
Optionally, the second liquid-phase inlet of the crystallization separator 6 is further connected to the liquid-phase outlet of the gas-liquid separator 7, the vapor obtained after the two-phase separation in the gas-liquid separator 7 enters the vapor compressor 2, and the liquid phase flows back to the crystallization separator 6 for flash evaporation again.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The MVR system is characterized by comprising a steam liquefier (1), a steam compressor (2), a distillate circulating pump (3), a main heat exchanger (4), a stock solution pump (5), a crystallization separator (6) and a gas-liquid separator (7), wherein the steam compressor (2) is arranged on a pipeline connected with a steam inlet of the steam liquefier (1) and a steam outlet of the gas-liquid separator (7), the distillate circulating pump (3) is arranged on a pipeline connected with a distillate outlet of the steam liquefier (1) and a hot side inlet of the main heat exchanger (4), the distillate inlet of the steam liquefier (1) is connected with the hot side outlet of the main heat exchanger (4), the stock solution pump (5) is connected with a cold side inlet of the main heat exchanger (4), the cold side outlet of the main heat exchanger (4) is connected with a first liquid phase inlet of the crystallization separator (6), high-temperature high-pressure steam discharged by the steam compressor (2) is mixed with the distillate cooled and cooled in the main heat exchanger (4), the high-temperature high-pressure steam is rapidly condensed, and the formed high-temperature distillate is conveyed to the main heat exchanger (3) for forced heat exchange.
2. The MVR system with high heat exchange efficiency according to claim 1, further comprising a distillate storage tank (8), wherein an inlet of the distillate storage tank (8) is connected with a hot side outlet of the main heat exchanger (4).
3. The MVR system with high heat exchange efficiency according to claim 2, further comprising a regulating valve (9) arranged on a pipeline connecting an inlet of the distillate storage tank (8) and a hot side outlet of the main heat exchanger (4) and used for regulating the discharge flow of the distillate so as to keep the liquid level in the vapor liquefier (1) stable.
4. The MVR system with high heat exchange efficiency according to claim 3, further comprising a first liquid level detection device and a controller, wherein the first liquid level detection device is disposed in the vapor liquefier (1), the first liquid level detection device and the regulating valve (9) are both electrically connected to the controller, and the controller is configured to control an opening degree of the regulating valve (9) according to a liquid level detection result of the first liquid level detection device, so as to keep a liquid level in the vapor liquefier (1) stable.
5. The efficient heat exchange MVR system of claim 4, wherein the first liquid level detection device is a liquid level meter or a liquid level sensor.
6. The MVR system with high heat exchange efficiency according to claim 4, further comprising a preheating heat exchanger (10), wherein a hot side inlet of the preheating heat exchanger (10) is connected with an outlet of the distillate storage tank (8), a distillate discharge pump (11) is arranged on a pipeline connected with the hot side inlet of the preheating heat exchanger (10), a cold side inlet of the preheating heat exchanger (10) is connected with the raw liquid pump (5), and a cold side outlet of the preheating heat exchanger is connected with a cold side inlet of the main heat exchanger (4).
7. The MVR system for efficient heat exchange according to claim 6, further comprising a second liquid level detection device disposed in the distillate storage tank (8), wherein the second liquid level detection device and the distillate removal pump (11) are electrically connected to the controller, and the controller is further configured to control the distillate removal pump (11) to be turned on when the second liquid level detection device detects that the liquid level in the distillate storage tank (8) is higher than a first threshold value, and to control the distillate removal pump (11) to be turned off when the second liquid level detection device detects that the liquid level in the distillate storage tank (8) is lower than a second threshold value.
8. The MVR system with high heat exchange efficiency according to claim 1, wherein the concentrate discharge pipeline of the crystallization separator (6) is further connected with the cold side inlet of the main heat exchanger (4) through a circulation pipeline, a concentrate circulation pump (12) is arranged on the circulation pipeline, and the circulated concentrate is mixed with the input stock solution and then carries out forced convection heat exchange with the high-temperature distillate in the main heat exchanger (4).
9. The MVR system with high heat exchange efficiency according to claim 1, wherein the second liquid-phase inlet of the crystallization separator (6) is further connected with the liquid-phase outlet of the gas-liquid separator (7).
10. The MVR system for high efficiency heat exchange according to claim 1, wherein the main heat exchanger (4) is a plate heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223236580.3U CN218833583U (en) | 2022-12-02 | 2022-12-02 | MVR system of high-efficient heat transfer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223236580.3U CN218833583U (en) | 2022-12-02 | 2022-12-02 | MVR system of high-efficient heat transfer |
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| Publication Number | Publication Date |
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| CN218833583U true CN218833583U (en) | 2023-04-11 |
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| CN202223236580.3U Active CN218833583U (en) | 2022-12-02 | 2022-12-02 | MVR system of high-efficient heat transfer |
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- 2022-12-02 CN CN202223236580.3U patent/CN218833583U/en active Active
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