CN216890175U - Energy-saving DMF waste water recovery system - Google Patents
Energy-saving DMF waste water recovery system Download PDFInfo
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- CN216890175U CN216890175U CN202220276164.7U CN202220276164U CN216890175U CN 216890175 U CN216890175 U CN 216890175U CN 202220276164 U CN202220276164 U CN 202220276164U CN 216890175 U CN216890175 U CN 216890175U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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Abstract
The utility model discloses an energy-saving DMF (dimethyl formamide) wastewater recovery system, belonging to the field of heat energy systems; comprises a heat pump tower, a steam compressor and a heat pump reboiler for DMF wastewater treatment; the air inlet end of the steam compressor is connected with the steam outlet end of the top of the heat pump tower, water vapor is discharged after being compressed by the steam compressor, the air outlet end of the steam compressor is connected with the heat supply end of the heat pump reboiler, and the steam outlet end of the top of the heat pump reboiler is connected with the heat supply end of the heat pump tower. The vapor produced by the heat pump tower is compressed and then introduced into the heat pump reboiler, so that the concentration effect of the DMF dilute solution can be ensured, the DMF dilute solution is concentrated to 40% from 20%, the subsequent procedures are facilitated, and meanwhile, the heat circulation is arranged, so that the energy loss of the system caused by direct heat dissipation is improved, and the energy-saving effect is achieved.
Description
Technical Field
The utility model relates to the field of heat energy systems, in particular to an energy-saving DMF (dimethyl formamide) wastewater recovery system.
Background
DMF is biologically toxic, can obstruct hematopoietic function and cause liver disorder when being contacted or inhaled by human body for a long time, is difficult to biodegrade, and can cause serious pollution to atmosphere and water. In the production process of synthetic leather, DMF is mainly used for ingredient dilution, a large amount of DMF waste gas is generated in dry and wet production, and DMF is absorbed by water to form waste water. In addition, in wet production, polyurethane is coagulated and DMF is leached into water, so that a large amount of DMF wastewater is generated. To eliminate the environmental impact of the wastewater and also to reduce the production costs, the DMF wastewater must be recycled or sold as a by-product. At present, a rectification method is mostly adopted for DMF recovery, about 80% of recovery cost is used for heat energy consumption, and the problem of high energy consumption exists.
At present, a double-tower DMF recovery process is mostly used in China, low-pressure steam or heat conducting oil is used as a heat medium, the double-tower process comprises atmospheric concentration and reduced pressure rectification, partial water is removed from DMF wastewater through atmospheric pressure rectification, and pure DMF is obtained through reduced pressure rectification. Due to the high energy consumption of the double-tower DMF recovery process, research and development and industrial tests of the three-tower DMF recovery process are carried out from 2004 in China. The process consists of two decompression concentration towers and one atmospheric rectification tower. DMF wastewater is subjected to two-stage reduced pressure concentration to remove part of water, and then is subjected to normal pressure rectification to obtain pure DMF. As the boiling point of DMF under the normal pressure condition is higher, the low-pressure steam can not meet the heating requirement, and therefore, heat conduction oil or medium-pressure steam is used as a heat medium. The literature provides a new energy-saving three-tower DMF recovery process, and the three-tower recovery process of first-stage reduced pressure concentration, second-stage normal pressure concentration and reduced pressure rectification is adopted, so that the processing capacity of the two-tower process is improved, but the energy-saving effect is poor, the occupied space is large, and the equipment cost is higher.
The existing three-tower recovery process has high energy consumption and can not ensure the recovery efficiency of each tower.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide an energy-saving DMF wastewater recovery system to optimize the energy-saving effect of the whole recovery system and ensure the recovery efficiency.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides an energy-saving DMF wastewater recovery system, which comprises a heat pump tower, a steam compressor and a heat pump reboiler for DMF wastewater treatment; the air inlet end of the steam compressor is connected with the steam outlet end of the top of the heat pump tower, water vapor is discharged after being compressed by the steam compressor, the air outlet end of the steam compressor is connected with the heat supply end of the heat pump reboiler, and the steam outlet end of the top of the heat pump reboiler is connected with the heat supply end of the heat pump tower.
The utility model has the preferable technical scheme that a bypass pipeline is arranged between an air inlet pipeline and an air outlet pipeline of the steam compressor, and a pressure relief protection valve is arranged on the bypass pipeline.
The utility model has the preferable technical scheme that an air outlet pipeline of the steam compressor is connected with an atmospheric flash tank, and an air outlet end of the atmospheric flash tank is provided with a control valve bank.
The utility model preferably adopts the technical scheme that the heat pump device further comprises a dilute liquid supply pump set, a dilute liquid heat exchanger and a tail gas heat exchanger, wherein a liquid inlet pipe is arranged at the liquid outlet end of the dilute liquid supply pump set and connected with the dilute liquid inlet end of the heat pump reboiler, and the liquid inlet pipe sequentially passes through the dilute liquid heat exchanger and the tail gas heat exchanger to be preheated along the liquid inlet direction.
The utility model preferably adopts the technical scheme that the heat pump heat recovery system further comprises a heat pump reflux drainage tank, wherein the steam outlet end of the heat pump reboiler is connected with the steam inlet end of the heat pump reflux drainage tank, and the steam outlet end of the heat pump reflux drainage tank is respectively connected with the dilute liquid heat exchanger and the reflux inlet end of the heat pump tower; and a liquid outlet pipe is arranged at the liquid outlet end of the dilute liquid heat exchanger to discharge vapor liquid after heat exchange.
The utility model preferably adopts the technical scheme that the tail gas discharge end of the heat pump reboiler is connected with the gas inlet end of the tail gas heat exchanger, the liquid outlet end of the tail gas heat exchanger is connected with the tail gas liquid inlet end of the heat pump backflow drainage tank, and the tail gas outlet end of the heat pump backflow drainage tank is connected with the gas inlet end of the tail gas heat exchanger, so that condensable steam in the tail gas can be recovered, and uncondensable steam is discharged from the gas outlet end of the tail gas heat exchanger.
The utility model has the preferable technical scheme that a liquid outlet pipe is arranged at a liquid outlet of a heat supply end of the heat pump tower and is connected with a dilute liquid inlet end of the heat pump reboiler.
The utility model has the preferable technical scheme that the heat pump reboiler is provided with a dilute liquid self-circulation pipeline, and the dilute liquid self-circulation pipeline of the heat pump reboiler is provided with a concentrated liquid outlet pipe so as to lead out concentrated DMF (dimethyl formamide) concentrated solution.
The utility model has the beneficial effects that:
(1) according to the energy-saving DMF wastewater recovery system provided by the utility model, water vapor produced by the heat pump tower is compressed, then introduced into the heat pump reboiler and returned to the heat supply end of the heat pump tower for waste heat utilization, so that energy loss caused by direct heat dissipation is reduced, and an energy-saving effect is achieved;
(2) through setting up heat pump backflow drainage tank, retrieve leading-in heat pump tower with the steam water among the whole recovery system, so make the water in the heat pump tower can utilize still less heat by the heating, and set up thin liquid heat exchanger and tail gas heat exchanger, let in the tail gas heat exchanger in the heat pump reboiler, come for the DMF thin liquid preheats for the DMF through thin liquid heat exchanger and tail gas heat exchanger, further improvement to the thermal utilization ratio of system, better energy-conserving effect has been reached, the quality of DMF concentrate has been guaranteed simultaneously, in order to guarantee going on of subsequent handling.
Drawings
FIG. 1 is a schematic flow chart of the principle of an energy-saving DMF waste water recovery system provided in the first embodiment of the utility model;
FIG. 2 is a schematic view of the schematic flow chart of an energy-saving DMF waste water recycling system provided in the second embodiment of the present invention;
in the figure:
1. a heat pump tower; 2. a vapor compressor; 3. a heat pump reboiler; 10. a bypass conduit; 101. a pressure relief protection valve; 21. a normal-pressure flash tank; 6. a diluent supply pump set; 7. a dilute liquid heat exchanger; 8. a tail gas heat exchanger; 9. a heat pump return drainage tank; 91. a concentrated solution outlet pipe; 31. a first-stage heat pump reboiler; 32. a secondary heat pump reboiler; 33. a tertiary heat pump reboiler.
Detailed Description
The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.
Example 1:
as shown in fig. 1, the embodiment provides an energy-saving DMF wastewater recovery system, which includes a heat pump tower 1, a vapor compressor 2, and a heat pump reboiler 3 for DMF wastewater treatment; the air inlet end of the steam compressor 2 is connected with the steam outlet end at the top of the heat pump tower 1, the steam is compressed by the steam compressor 2 and then discharged, the air outlet end of the steam compressor 2 is connected with the heat supply end of the heat pump reboiler 3, and the steam outlet end at the top of the heat pump reboiler 3 is connected with the heat supply end of the heat pump tower 1; the vapor heated by the heat pump tower 1 enters the steam compressor 2 first and then is pressurized to obtain high-pressure vapor, the high-pressure vapor is introduced into the heat pump reboiler 3 to obtain a better rectification effect on DMF dilute solution, and finally the rectified DMF-containing vapor is introduced into the heat supply end of the heat pump tower 1 again to be utilized, namely, the water in the heat pump tower 1 is heated, the vapor at the moment is not dissipated with other extra heat, the heat is utilized to the maximum, and thus, the heat circulation of the vapor is completed.
In order to protect the vapor compressor 2, a bypass pipeline 10 is arranged between the air inlet pipeline and the air outlet pipeline of the vapor compressor 2, and a pressure relief protection valve 101 is arranged on the bypass pipeline 10. An air outlet pipeline of the steam compressor 2 is connected with an atmospheric flash tank 21, and an air outlet end of the atmospheric flash tank 21 is provided with a control valve bank.
In order to further improve the utilization efficiency of other heat discharged from the tower, the heat pump reflux water discharge tank 9 is further included, the steam liquid outlet end of the heat pump reboiler 3 is connected with the steam liquid inlet end of the heat pump reflux water discharge tank 9, and the liquid outlet end of the heat pump reflux water discharge tank 9 is respectively connected with the dilute liquid heat exchanger 7 and the heat supply end of the heat pump tower 1; the liquid outlet end of the dilute liquid heat exchanger 7 is provided with a liquid outlet pipe for discharging vapor liquid after heat exchange.
The liquid outlet end of the tail gas heat exchanger 8 is connected with the tail gas inlet end of the heat pump backflow drainage tank 9, the tail gas outlet end of the heat pump backflow drainage tank 9 is connected with the gas inlet end of the tail gas heat exchanger 8, the tail gas discharge end of the heat pump reboiler 3 is connected with the gas inlet end of the tail gas heat exchanger 8, the tail gas of the heat pump reboiler 3 is preheated by DMF dilute liquid in the tail gas heat exchanger 8 so as to recycle condensable steam in the tail gas, and the uncondensable tail gas is discharged from the gas outlet end of the tail gas heat exchanger 8. The DMF dilute liquid is preheated by the dilute liquid heat exchanger 7 and the tail gas heat exchanger 8, so that the heat utilization efficiency of the recovery system is further improved, and the energy-saving effect is improved.
In order to concentrate the DMF dilute solution, the system further comprises a dilute solution supply pump unit 6, a dilute solution heat exchanger 7 and a tail gas heat exchanger 8, wherein a liquid inlet pipe is arranged at the liquid outlet end of the dilute solution supply pump unit 6 and is connected with the dilute solution inlet end of the heat pump reboiler 3, and the liquid inlet pipe sequentially passes through the dilute solution heat exchanger 7 and the tail gas heat exchanger 8 to be preheated along the liquid inlet direction. The DMF dilute solution is firstly discharged from a dilute solution supply pump unit 6, is preheated by a dilute solution heat exchanger 7 and a tail gas heat exchanger 8, and then enters a heat pump reboiler 3 for concentration and separation.
In order to enable DMF (dimethyl formamide) dilute liquid condensed at the heat supply end of the heat pump tower 1 to enter the heat pump reboiler 3 for further concentration and separation, a liquid outlet at the heat supply end of the heat pump tower 1 is provided with a liquid outlet pipe connected with the dilute liquid inlet end of the heat pump reboiler 3.
In order to enhance the concentration effect of the DMF dilute solution, the heat pump reboiler 3 is provided with a dilute solution self-circulation pipeline, and the dilute solution self-circulation pipeline of the heat pump reboiler 3 is provided with a concentrated solution outlet pipe 91 so as to lead out the concentrated DMF concentrated solution.
Example 2:
as shown in fig. 2, unlike in example 1, a plurality of heat pump reboilers may be provided depending on the operation conditions. The system comprises a heat pump tower 1, a vapor compressor 2, a first-stage heat pump reboiler 31, a second-stage heat pump reboiler 32 and a third-stage heat pump reboiler 33 for DMF wastewater treatment; the inlet end of vapor compressor 2 is connected with the vapour discharge end at heat pump tower 1 top, vapor discharges after vapor compressor 2 compression treatment, the end of giving vent to anger of vapor compressor 2 is connected with one-level heat pump reboiler 31 simultaneously, second grade heat pump reboiler 32, the heat supply end of tertiary heat pump reboiler 33, the vapour discharge end at one-level heat pump reboiler 31, second grade heat pump reboiler 32, tertiary heat pump reboiler 33 top all is connected with the heat supply end of heat pump tower 1. The steam heated by the heat supply vaporization tower 1 firstly enters the steam compressor 2 and then is pressurized to obtain high-pressure steam, then the high-pressure steam is guided into the first-stage heat pump reboiler 31, the second-stage heat pump reboiler 32 and the third-stage heat pump reboiler 33 to obtain better rectification effect on DMF dilute liquid, finally the rectified DMF-containing steam is guided into the heat supply end of the heat supply vaporization tower 1 again to be utilized, namely, the water in the heat supply vaporization tower 1 is heated, the steam does not have other extra heat to be dissipated, the heat is utilized to the maximum degree, meanwhile, the DMF-containing dilute liquid is guided into the third-stage heat pump reboiler 33 to be further rectified, and therefore, the heat circulation of the steam is completed.
In order to further improve the utilization efficiency of other heat discharged from the tower, the system also comprises a heat pump reflux water discharge tank 9, the vapor liquid outlet ends of a first-stage heat pump reboiler 31, a second-stage heat pump reboiler 32 and a third-stage heat pump reboiler 33 are all connected with the vapor liquid inlet end of the heat pump reflux water discharge tank 9, and the liquid outlet end of the heat pump reflux water discharge tank 9 is respectively connected with the dilute liquid heat exchanger 7 and the heat supply end of the heat supply vaporization tower 1; the liquid outlet end of the dilute liquid heat exchanger 7 is provided with a liquid outlet pipe for discharging vapor liquid after heat exchange.
8 liquid ends of tail gas heat exchanger are connected with 9 tail gas inlet ends of heat pump backward flow drainage jar, 9 tail gas outlet ends of heat pump backward flow drainage jar are connected with 8 inlet ends of tail gas heat exchanger, one-level heat pump reboiler 31, second grade heat pump reboiler 32, the tail gas discharge end of third grade heat pump reboiler 33 all is connected with 8 inlet ends of tail gas heat exchanger, one-level heat pump reboiler 31, second grade heat pump reboiler 32, the tail gas of third grade heat pump reboiler 33 preheats for the DMF diluent at tail gas heat exchanger 8, in order to retrieve the steam of condensable in the tail gas, the end discharge is given vent to the anger by tail gas heat exchanger 8 of can not condensing. The DMF dilute liquid is preheated by the dilute liquid heat exchanger 7 and the tail gas heat exchanger 8, so that the heat utilization efficiency of the recovery system is further improved, and the energy-saving effect is improved.
In order to concentrate the DMF dilute solution, the system further comprises a dilute solution supply pump unit 6, a dilute solution heat exchanger 7 and a tail gas heat exchanger 8, wherein a liquid inlet pipe is arranged at the liquid outlet end of the dilute solution supply pump unit 6 and is connected with the dilute solution inlet end of the first-stage heat pump reboiler 311, and the liquid inlet pipe sequentially passes through the dilute solution heat exchanger 7 and the tail gas heat exchanger 8 to be preheated along the liquid inlet direction. The DMF dilute solution is firstly discharged from a dilute solution supply pump unit 6, is preheated by a dilute solution heat exchanger 7 and a tail gas heat exchanger 8, and then enters a first-stage heat pump reboiler 311 for rectification and concentration.
In order to enable DMF (dimethyl formamide) dilute liquid condensed at the heat supply end of the heat pump tower 1 to enter the third-stage heat pump reboiler 33 for further rectification, a liquid outlet at the heat supply end of the heat pump tower 1 is provided with a liquid outlet pipe connected with the dilute liquid inlet end of the third-stage heat pump reboiler 33, and the liquid outlet ends of the first-stage heat pump reboiler 31 and the third-stage heat pump reboiler 33 are connected with the dilute liquid inlet end of the second-stage heat pump reboiler 32. In this way, the DMF concentrates of the first stage heat pump reboiler 31 and the third stage heat pump reboiler 33 enter the second stage heat pump reboiler 32 for further concentration.
In order to enhance the concentration effect of DMF dilute solution, dilute solution self-circulation pipelines are arranged in the first-stage heat pump reboiler 31, the second-stage heat pump reboiler 32 and the third-stage heat pump reboiler 33, and the last concentration effect is improved through multiple times of rectification and concentration; the dilute liquid self-circulation pipeline of the second-stage heat pump reboiler 32 is provided with a concentrated liquid outlet pipe 91 to lead out concentrated DMF.
While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the utility model. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.
Claims (8)
1. The utility model provides an energy-saving DMF effluent recovery system which characterized in that:
comprises a heat pump tower (1), a vapor compressor (2) and a heat pump reboiler (3) for DMF wastewater treatment; the gas inlet end of the steam compressor (2) is connected with the steam discharge end at the top of the heat pump tower (1), water vapor is discharged after the compression treatment of the steam compressor (2), the gas outlet end of the steam compressor (2) is connected with the heat supply end of the heat pump reboiler (3), and the steam discharge end at the top of the heat pump reboiler (3) is connected with the heat supply end of the heat pump tower (1).
2. The energy-saving DMF waste water recovery system according to claim 1, wherein:
a bypass pipeline (10) is arranged between an air inlet pipeline and an air outlet pipeline of the steam compressor (2), and a pressure relief protection valve (101) is arranged on the bypass pipeline (10).
3. The energy-saving DMF waste water recovery system according to claim 1, wherein:
the air outlet pipeline of the steam compressor (2) is connected with an atmospheric flash tank (21), and an air outlet end of the atmospheric flash tank (21) is provided with a control valve bank.
4. The energy-saving DMF waste water recovery system according to claim 1, wherein:
still include dilute liquid supply pump package (6), dilute liquid heat exchanger (7) and tail gas heat exchanger (8), the play liquid end of dilute liquid supply pump package (6) is provided with the feed liquor union coupling the dilute liquid feed liquor end of heat pump reboiler (3), along the feed liquor direction, the feed liquor pipe preheats through dilute liquid heat exchanger (7) and tail gas heat exchanger (8) in proper order.
5. The energy-saving DMF waste water recovery system according to claim 4, wherein:
the heat pump reflux water draining system is characterized by further comprising a heat pump reflux water draining tank (9), wherein the steam liquid outlet end of the heat pump reboiler (3) is connected with the steam liquid inlet end of the heat pump reflux water draining tank (9), and the liquid outlet end of the heat pump reflux water draining tank (9) is respectively connected with the dilute liquid heat exchanger (7) and the reflux liquid inlet end of the heat pump tower (1); and a liquid outlet pipe is arranged at the liquid outlet end of the dilute liquid heat exchanger (7) to discharge vapor liquid after heat exchange.
6. The energy-saving DMF waste water recovery system according to claim 5, wherein:
the tail gas discharge end of the heat pump reboiler (3) is connected with the gas inlet end of the tail gas heat exchanger (8), the liquid outlet end of the tail gas heat exchanger (8) is connected with the tail gas liquid inlet end of the heat pump backflow drainage tank (9), the tail gas outlet end of the heat pump backflow drainage tank (9) is connected with the gas inlet end of the tail gas heat exchanger (8) so as to recover condensable steam in the tail gas, and the condensable steam cannot be discharged from the gas outlet end of the tail gas heat exchanger (8).
7. The energy-saving DMF waste water recovery system according to claim 1, wherein:
and a liquid outlet at the heat supply end of the heat pump tower (1) is provided with a liquid outlet pipe connected with the dilute liquid inlet end of the heat pump reboiler (3).
8. The energy-saving DMF waste water recovery system according to claim 1, wherein:
the heat pump reboiler (3) is provided with the dilute liquid self-circulation pipeline, the dilute liquid self-circulation pipeline of the heat pump reboiler (3) is provided with a concentrated solution outlet pipe (91) to lead out the concentrated DMF concentrated solution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220276164.7U CN216890175U (en) | 2022-02-10 | 2022-02-10 | Energy-saving DMF waste water recovery system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220276164.7U CN216890175U (en) | 2022-02-10 | 2022-02-10 | Energy-saving DMF waste water recovery system |
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| CN216890175U true CN216890175U (en) | 2022-07-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115382238A (en) * | 2022-08-24 | 2022-11-25 | 吉安巨联环保科技有限公司 | Method for reducing energy consumption of DMF waste liquid comprehensive utilization equipment |
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2022
- 2022-02-10 CN CN202220276164.7U patent/CN216890175U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115382238A (en) * | 2022-08-24 | 2022-11-25 | 吉安巨联环保科技有限公司 | Method for reducing energy consumption of DMF waste liquid comprehensive utilization equipment |
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