CN221130989U - Evaporation system for removing formaldehyde in glyphosate at low temperature through reverse Carnot cycle - Google Patents
Evaporation system for removing formaldehyde in glyphosate at low temperature through reverse Carnot cycle Download PDFInfo
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- CN221130989U CN221130989U CN202322835659.6U CN202322835659U CN221130989U CN 221130989 U CN221130989 U CN 221130989U CN 202322835659 U CN202322835659 U CN 202322835659U CN 221130989 U CN221130989 U CN 221130989U
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- 238000001704 evaporation Methods 0.000 title claims abstract description 140
- 230000008020 evaporation Effects 0.000 title claims abstract description 132
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 239000005562 Glyphosate Substances 0.000 title claims abstract description 54
- XDDAORKBJWWYJS-UHFFFAOYSA-N glyphosate Chemical compound OC(=O)CNCP(O)(O)=O XDDAORKBJWWYJS-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229940097068 glyphosate Drugs 0.000 title claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 270
- 239000011552 falling film Substances 0.000 claims abstract description 25
- 239000012153 distilled water Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims description 71
- 238000012544 monitoring process Methods 0.000 claims description 25
- 239000003507 refrigerant Substances 0.000 claims description 24
- 238000005070 sampling Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000009834 vaporization Methods 0.000 claims 4
- 230000008016 vaporization Effects 0.000 claims 4
- 239000012527 feed solution Substances 0.000 claims 1
- PDYXIVPKOMYDOK-UHFFFAOYSA-N Glyphosate-monoammonium Chemical compound [NH4+].OC(=O)CNCP(O)([O-])=O PDYXIVPKOMYDOK-UHFFFAOYSA-N 0.000 abstract description 17
- 238000009835 boiling Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 239000003657 drainage water Substances 0.000 abstract 1
- 239000000498 cooling water Substances 0.000 description 11
- 238000007599 discharging Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- MGJURKDLIJVDEO-UHFFFAOYSA-N formaldehyde;hydrate Chemical compound O.O=C MGJURKDLIJVDEO-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- OOYGSFOGFJDDHP-KMCOLRRFSA-N kanamycin A sulfate Chemical group OS(O)(=O)=O.O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CN)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O[C@@H]2[C@@H]([C@@H](N)[C@H](O)[C@@H](CO)O2)O)[C@H](N)C[C@@H]1N OOYGSFOGFJDDHP-KMCOLRRFSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- YWICANUUQPYHOW-UHFFFAOYSA-M sodium;2-(phosphonomethylamino)acetate Chemical compound [Na+].OP(O)(=O)CNCC([O-])=O YWICANUUQPYHOW-UHFFFAOYSA-M 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model relates to an evaporation system for removing formaldehyde in glyphosate at a low temperature by reverse Carnot cycle, which comprises a single kettle batch falling film evaporation system, a system for removing glyphosate in steam by rectification, a reverse Carnot cycle-hot water flash evaporation generation system and a closed vacuum system; adopting a reverse Carnot circulation heat source and a refrigerating unit, carrying out flash evaporation by hot water to obtain negative pressure steam with the temperature of 40-60 ℃ serving as a heat source of a falling film heat exchanger, simultaneously providing chilled water with the temperature of 10-30 ℃ serving as a cold source of a condenser, adopting low-temperature evaporation, wherein the evaporation temperature is between 35-50 ℃, ammonium glyphosate is not decomposed, the ammonium glyphosate is not easy to enter the evaporated water, high-boiling-point steam containing glyphosate and the like is condensed in a first-stage condenser, the condensate returns to a rectifying tower, the distilled water and formaldehyde enter a second-stage condenser, the glyphosate with higher boiling point is continuously left in ammonium glyphosate solution, and the obtained external drainage water has the glyphosate content lower than 0.3 percent; after the glyphosate solution passes through the system, the formaldehyde content reaches the national standard requirement, and the material is concentrated.
Description
Technical Field
The utility model belongs to the technical field of evaporation-rectification-concentration systems, and relates to an evaporation system for removing formaldehyde in glyphosate at a low temperature by reverse Carnot cycle.
Background
In the production process of ammonium glyphosate, the content concentration and formaldehyde concentration of the usually obtained primary products, such as ammonium glyphosate and sodium glyphosate, can not reach the national standard GB/T12686-2017 glyphosate technical product, the national standard requires that the content of the glyphosate is more than 30 percent, and the formaldehyde content is less than 0.6g/kg.
This is particularly true when producing ammonium glyphosate, because formaldehyde can form urotropine with ammonia, which is difficult to remove. The conventional removal process adopts an evaporation mode, formaldehyde is evaporated while ammonium glyphosate is concentrated, and the problem is that the evaporation temperature is too high, such as a conventional two-effect evaporator is adopted, the evaporation temperature is 50-90 ℃, the ammonium glyphosate is decomposed at the moment, so that the content of glyphosate in distilled water can be up to more than 1%, and the glyphosate is recovered by adding equipment. The conventional process route is shown in fig. 1.
The utility model adopts a reverse Carnot cycle heat source-refrigerating unit, obtains negative pressure steam with the temperature of 40-60 ℃ through hot water flash evaporation, is used as a heat source of a falling film heat exchanger, and simultaneously provides chilled water with the temperature of 10-30 ℃ as a cold source of a condenser. The single-effect falling film single-kettle batch processing operation mode is adopted, so that the concentration of the obtained ammonium glyphosate and formaldehyde index reach the standard. The utility model adopts low-temperature evaporation, the evaporation temperature is between 35 and 50 ℃, the ammonium glyphosate is not decomposed, and is not easy to enter distilled water, meanwhile, the utility model is provided with a small rectifying tower, the distilled water and formaldehyde enter a second-stage condenser in a pump circulation mode, and the glyphosate with higher boiling point is continuously remained in the ammonium glyphosate solution, so that the obtained externally discharged water has the content of glyphosate lower than 0.3%, thereby reducing the equipment investment for recycling the glyphosate by subsequent membrane concentration.
Disclosure of utility model
In view of this, the utility model provides an evaporation system for removing formaldehyde in glyphosate at low temperature by reverse Carnot cycle in order to solve the problems that in the process of producing ammonium glyphosate by evaporation, the evaporation temperature required by formaldehyde evaporation is too high, ammonium glyphosate is decomposed, so that the content of glyphosate in distilled water can be up to more than 1%, and equipment is required to be added for recycling the glyphosate in the follow-up process, and the equipment investment cost is high.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
An evaporation system for removing formaldehyde in glyphosate at a low temperature by reverse Carnot cycle comprises a single kettle batch falling film evaporation system, a system for removing glyphosate in steam by rectification, a reverse Carnot cycle-hot water flash evaporation generation system and a closed vacuum system;
The single-kettle batch falling film evaporation system comprises an evaporation liquid storage tank, a heater, a second-stage condenser, a falling film circulating magnetic pump and an evaporation water vortex magnetic pump; the heater is arranged at the top of the evaporation storage tank, the upper part of the evaporation storage tank is provided with a water inlet and a feed inlet, a second-stage condenser pipeline is connected to a steam outlet at the bottom of the heater, a liquid outlet pipeline at the bottom of the evaporation storage tank is connected to a liquid inlet at the top of the heater, a falling film circulating magnetic pump is arranged on the connecting pipeline, and a water evaporation vortex magnetic pump pipeline is connected to a liquid outlet of the second-stage condenser;
The system for removing glyphosate in steam by rectification comprises a rectifying tower arranged at the top of an evaporation liquid storage tank, a first-stage condenser connected with a steam outlet at the upper part of the rectifying tower, and a rectifying tower vortex magnetic circulating pump connected between a feed inlet and a discharge outlet of the rectifying tower, wherein the steam outlet at the upper part of the first-stage condenser is communicated with a second-stage condenser, and pall ring packing is filled in the rectifying tower;
The reverse Carnot cycle-hot water flash evaporation generating system comprises a reverse Carnot cycle heat source refrigerant unit and a hot water flash evaporation steam generating tank, wherein the hot water flash evaporation steam generating tank is in cycle communication with the reverse Carnot cycle heat source refrigerant unit, a hot water circulating pump is arranged on a connecting pipeline, a hot water flash evaporation spray header is arranged at a water inlet end in the hot water flash evaporation steam generating tank, and a water outlet end at the lower part of a heater is connected with a pipeline of the hot water flash evaporation steam generating tank; the second-stage condenser is in circulating communication with the inverse Kano circulating heat source refrigerant unit, and a refrigerating water circulating pump is arranged on a connecting pipeline;
The closed vacuum system comprises a water ring vacuum pump connected with the second-stage condenser, a vacuum water tank connected with the water ring vacuum pump and a plate heat exchanger for cooling the water ring vacuum pump.
Further, install water flow meter and evaporation liquid storage pot water inlet automatic valve on the pipeline at evaporation liquid storage pot water inlet place, install feeding flow meter and evaporation liquid storage pot feeding automatic valve on the pipeline at feed inlet place, install the outer valve of heater noncondensable gas on the pipeline that second level condenser and heater are connected, be provided with the liquid storage pot pressure sensor of being convenient for observe evaporation liquid storage pot internal pressure and the liquid storage pot magnetic flap level gauge of being convenient for observe liquid level in the evaporation liquid storage pot on the evaporation liquid storage pot, install the bleeder valve of being convenient for the finished product take out and the feed liquid temperature sensor of being convenient for monitor feed liquid temperature on heater and the evaporation liquid storage pot connecting pipe.
Further, be connected with the three-way valve of evaporating water outward discharging that takes the flowmeter of evaporating water on evaporating water swirl magnetic drive pump and be provided with comdenstion water outward discharging check valve and comdenstion water sampling port on the connecting line, will contain the comdenstion water of formaldehyde and discharge respectively according to formaldehyde content, and the comdenstion water sampling port is convenient for carry out sampling detection to the comdenstion water that the exhaust contains formaldehyde.
Further, a heater temperature sensor which is convenient for monitoring the temperature of the feed liquid and a heater pressure sensor which is convenient for monitoring the pressure in the rectifying tower are arranged on the rectifying tower, a cooling water tower water inlet temperature sensor with a cooling water tower water inlet automatic regulating valve is arranged on a water inlet pipe at the bottom of the first-stage condenser, and a cooling water tower water outlet temperature sensor is arranged on a water outlet pipe.
Further, a hot water outlet temperature sensor which is convenient for monitoring the outlet temperature of the hot water flash steam generating tank is arranged on a pipeline between a water outlet at the bottom of the hot water flash steam generating tank and the inverse Carnot cycle heat source refrigerant unit, and a hot water return temperature sensor which is convenient for monitoring the inlet temperature of the hot water flash steam generating tank is arranged on a pipeline between the inverse Carnot cycle heat source refrigerant unit and a water inlet at the upper part of the hot water flash steam generating tank.
Further, a steam generating tank automatic valve for controlling the steam quantity and a steam generating tank magnetic flap level gauge for conveniently observing the liquid level in the hot water flash steam generating tank are arranged on the hot water flash steam generating tank; the pipeline connecting the second-stage condenser and the chilled water circulating pump is provided with a chilled water return water temperature sensor which is convenient for monitoring the chilled water temperature, and the pipeline connecting the reverse Carnot circulating heat source refrigerant unit and the second-stage condenser is provided with a chilled water inlet water temperature sensor.
Further, a water ring vacuum pump inlet one-way valve is arranged on a connecting pipeline between the second-stage condenser and the water ring vacuum pump, a vacuum water tank magnetic flap level gauge which is convenient for monitoring the liquid level of the vacuum water tank and a vacuum water tank water supplementing valve which is convenient for supplementing water are arranged on the vacuum water tank, a vacuum water tank drainage automatic valve is arranged on a connecting pipeline between the vacuum water tank and the distilled water vortex magnetic pump, a frozen water magnetic flap level gauge which is convenient for monitoring the liquid level of the second-stage condenser, a second-stage condenser pressure sensor which is convenient for monitoring the internal pressure of the second-stage condenser and an atmosphere communication valve which is convenient for adjusting the internal air pressure are arranged on the second-stage condenser.
Further, the evaporating temperature and absolute pressure of the feed liquid in the system are 35-50 ℃ and 6-12Kpa, the finished glyphosate product after evaporating treatment meets the national standard, the glyphosate content is more than 30%, and the formaldehyde content is less than 0.6g/kg. And meanwhile, the content of glyphosate in the distilled water is less than 0.3 percent.
The utility model has the beneficial effects that:
1. The utility model discloses an evaporation system for removing formaldehyde in glyphosate at low temperature by reverse Carnot circulation, which adopts a reverse Carnot circulation heat source and a refrigerating unit, obtains negative pressure steam at 40-60 ℃ by flash evaporation of hot water as a heat source of a falling film heat exchanger, and simultaneously provides chilled water at 10-30 ℃ as a cold source of a condenser, thereby realizing low-temperature evaporation, wherein the evaporation temperature is between 35-50 ℃, and ammonium glyphosate is not decomposed at the temperature and is not easy to enter distilled water.
2. The evaporation system for removing formaldehyde in glyphosate at low temperature by reverse Carnot cycle disclosed by the utility model adopts a single-effect falling film single-kettle batch processing operation mode, so that the concentration of the obtained ammonium glyphosate and formaldehyde index reach the standard, the content of the glyphosate is more than 30%, and the formaldehyde content is less than 0.6g/kg.
3. The utility model discloses an evaporation system for removing formaldehyde in glyphosate at low temperature by reverse Carnot cycle, which is provided with a small rectifying tower, wherein high-boiling-point steam containing glyphosate and the like is condensed in a first-stage condenser, the condensate returns to the rectifying tower, formaldehyde-water steam enters a second-stage condenser, so that the glyphosate with higher boiling point is continuously remained in glyphosate ammonium salt solution, and the content of the glyphosate is lower than 0.3% in the external drainage obtained by the second-stage condenser.
4. According to the evaporation system for removing formaldehyde in glyphosate at low temperature by reverse Carnot cycle disclosed by the utility model, after the glyphosate solution of a primary product passes through the system, the formaldehyde content reaches national standard requirements, and meanwhile, the material is concentrated; by adopting the reverse Carnot cycle unit, the electric consumption for evaporating one ton of water can be 150-180kwh.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a conventional two-effect evaporation-membrane concentration recovery process;
FIG. 2 is a schematic diagram of an evaporation system for removing formaldehyde from glyphosate at low temperature using reverse Carnot cycle according to the present utility model;
FIG. 3 is a schematic view showing the installation structure of the evaporation liquid storage tank, the heater and the rectifying tower in FIG. 2 according to the present utility model;
FIG. 4 is a schematic view of the installation structure of the first stage condenser and the second stage condenser in FIG. 2 according to the present utility model;
Fig. 5 is a schematic view of an installation structure of the closed vacuum system in fig. 2 according to the present utility model.
Reference numerals: 1. a falling film circulating magnetic pump; 2. a discharge valve; 3. evaporating the liquid storage tank; 4. a feed liquid temperature sensor; 5. a water inlet flowmeter; 6. a heater noncondensable gas external discharge valve; 7. a feed flow meter; 8. a heater; 9. a rectifying tower; 10. a heater temperature sensor; 11. a heater pressure sensor; 12. a liquid storage tank pressure sensor; 13. a liquid storage tank magnetic turnover plate liquid level meter; 14. a rectifying tower vortex magnetic circulation pump; 15. a first stage condenser; 16. a water inlet temperature sensor of the cooling tower; 17. a cold water tower outlet water temperature sensor; 18. a magnetic flap level meter of the steam generating tank; 19. a hot water flash steam generation tank; 20. a hot water outlet temperature sensor; 21. a hot water backwater temperature sensor; 22. an inverse carnot cycle heat source-refrigerant system; 23. a chilled water return water temperature sensor; 24. a chilled water inlet temperature sensor; 25. a condensed water discharge check valve; 26. a condensed water sampling port; 27. a distilled water vortex magnetic pump; 28 a distilled water flowmeter; 29. a three-way valve for discharging the distilled water; 30. vacuum water tank magnetic turning plate level gauge; 31. a vacuum water tank; 32. a water ring vacuum pump; 33. an inlet one-way valve of the water ring vacuum pump; 34. frozen water magnetic flap level gauge; 35. an atmosphere communication valve; 36. a second stage condenser pressure sensor; 37. a second stage condenser; 38. a plate heat exchanger; 39. water replenishing valve of vacuum water tank; 40. a vacuum water tank drain automatic valve; 41. automatic valve of steam generating tank; 42. the water inlet automatic regulating valve of the cooling water tower; 43. an automatic water inlet valve of the evaporation liquid storage tank; 44. an automatic feed valve of the evaporation liquid storage tank; 45. a hot water flash shower head; 46. a chilled water circulation pump; 47. a hot water circulating pump.
Detailed Description
Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present utility model by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the utility model; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it is to be understood that some well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present utility model, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
The evaporation system for removing formaldehyde in glyphosate at low temperature by reverse Carnot cycle as shown in figures 2-5 comprises a single kettle batch falling film evaporation system, a system for removing glyphosate in steam by rectification, a reverse Carnot cycle-hot water flash evaporation generation system and a closed vacuum system.
The single kettle batch falling film evaporation system comprises a high-capacity evaporation liquid storage tank 3, a heater 8, a second-stage condenser 37, a falling film circulating magnetic pump 1 and a distilled water vortex magnetic pump 27; the heater 8 is installed at the top of evaporation liquid storage pot 3, and water inlet and feed inlet have been seted up on evaporation liquid storage pot 3 upper portion, and second level condenser 37 pipe connection is to heater 8 bottom steam outlet, and evaporation liquid storage pot 3 bottom liquid outlet pipe connection is to heater 8 top inlet and connecting line on-line installation falling film circulation magnetic force pump 1, and evaporation water swirl magnetic force pump 27 pipe connection is to second level condenser 37 liquid outlet. The heater 8 is characterized in that the feed liquid passes through a tube side, the heat source steam passes through a shell side, the vertical falling film circulates, the tube wall is fully utilized, and the evaporation capacity is large. The second stage condenser 37 features a steam shell side and a cooling water tube side.
The water inlet of the evaporation storage tank 3 is provided with a water inlet flowmeter 5 and an evaporation storage tank water inlet automatic valve 43, the pipeline of the feed inlet is provided with a feed flowmeter 7 and an evaporation storage tank feed automatic valve 44, the pipeline of the second-stage condenser 37 connected with the heater 8 is provided with a heater noncondensable gas external discharge valve 6, the evaporation storage tank 3 is provided with a storage tank pressure sensor 12 which is convenient for observing the pressure in the evaporation storage tank 3 and a storage tank magnetic flap liquid level meter 13 which is convenient for observing the liquid level in the evaporation storage tank 3, and the pipeline of the heater 8 connected with the evaporation storage tank 3 is provided with a discharge valve 2 which is convenient for taking out a finished product and a feed liquid temperature sensor 4 which is convenient for monitoring the feed liquid temperature.
The distilled water vortex magnetic pump 27 is connected with a distilled water discharging three-way valve 29 with a distilled water flowmeter 28, and a connecting pipeline is provided with a condensed water discharging one-way valve 25 and a condensed water sampling port 26, so that condensed water containing formaldehyde is discharged according to the formaldehyde content, and the condensed water sampling port 26 is convenient for sampling and detecting the discharged condensed water containing formaldehyde.
The glyphosate-containing raw material enters the evaporation storage tank 3 through the evaporation storage tank feeding automatic valve 44, enters the tube side of the heater 8 under the action of the falling film circulating magnetic pump 1, flows down along the inner wall of the tube from top to bottom, is evaporated and concentrated while flowing down, and samples and analyzes the material taken out from the discharge valve 2 until formaldehyde in the tank is qualified. And after the feed liquid is qualified, all the feed liquid in the evaporation liquid storage tank 3 passes through the discharge valve 2 and is fed into the finished product tank. The steam of the evaporated water-formaldehyde is condensed into liquid in the second condenser 37, and is discharged by the evaporated water vortex magnetic pump 27, and the evaporated water is separated into high formaldehyde evaporated water and low formaldehyde evaporated water according to time sequence by the evaporated water discharge three-way valve 29, and the condensed water initially evaporated has higher formaldehyde content.
The system for removing glyphosate in steam through rectification comprises a rectifying tower 9 arranged at the top of an evaporation liquid storage tank 3, a first-stage condenser 15 connected to a steam outlet at the upper part of the rectifying tower 9, and a rectifying tower vortex magnetic circulation pump 14 connected between a feed inlet and a discharge outlet of the rectifying tower 9, wherein the steam outlet at the upper part of the first-stage condenser 15 is communicated to a second-stage condenser 37, the rectifying tower 9 is filled with pall ring packing with the height of 3-5 meters, and a heater temperature sensor 10 and a heater pressure sensor 11 are arranged on the rectifying tower 9, wherein the heater temperature sensor 10 and the heater pressure sensor 11 are convenient for monitoring the temperature of feed liquid. A water inlet pipe at the bottom of the first-stage condenser 15 is provided with a water inlet temperature sensor 16 of the water tower with a water inlet automatic regulating valve 42 of the water tower, and a water outlet pipe is provided with a water outlet temperature sensor 17 of the water tower.
The first-stage condenser 15 is a four-tube-process first-stage condenser 15, and is characterized in that excessive heat of a system is taken away, excessive heating of the system is avoided, and meanwhile high-boiling-point glyphosate vapor is condensed.
The rectifying tower 9 is provided with a rectifying tower vortex magnetic circulation pump 14, so that pall ring packing in the rectifying tower is in a wet state, and when glyphosate-water-formaldehyde steam passes through, heavy-component high-boiling-point substance glyphosate in a gas phase is transferred into a liquid phase, so that separation is realized, and the purposes of leaving the glyphosate in a finished product and reducing the content of the glyphosate in distilled water are achieved.
The steam containing glyphosate-water-formaldehyde in the rectifying tower 9 enters a first-stage condenser 15, heat is lost under the action of cooling water, and high-boiling glyphosate is condensed into liquid in the first-stage condenser 15 and returns to the rectifying tower 9. The flow of the cooling water can be regulated by the automatic water inlet regulating valve 42 of the cooling water tower, and the temperature of the inlet water and the outlet water of the cooling water tower can be monitored by the water inlet temperature sensor 16 of the cooling water tower and the water outlet temperature sensor 17 of the cooling water tower. The bottom of the rectifying tower is provided with a baffle, part of condensed water containing glyphosate is returned to the evaporation liquid storage tank 3, and part of condensed water is returned to the upper part of the rectifying tower 9 through the rectifying tower vortex magnetic circulation pump 14 and sprayed into the rectifying tower, so that all pall rings in the rectifying tower are in a wetting state.
The reverse Carnot cycle-hot water flash evaporation generating system comprises a reverse Carnot cycle heat source refrigerant unit and a hot water flash evaporation steam generating tank 19, a hot water circulating pump 47 is arranged between a water outlet at the bottom of the hot water flash evaporation steam generating tank 19 and the reverse Carnot cycle heat source refrigerant unit, a hot water outlet temperature sensor 20 which is convenient for monitoring the outlet temperature of the hot water flash evaporation steam generating tank 19 is arranged on the pipeline, a hot water return temperature sensor 21 which is convenient for monitoring the inlet temperature of the hot water flash evaporation steam generating tank 19 is arranged on the pipeline between the reverse Carnot cycle heat source refrigerant unit and the water inlet at the upper part of the hot water flash evaporation steam generating tank 19, and a hot water flash evaporation spray header 45 is arranged at the water inlet end in the hot water flash evaporation steam generating tank 19, so that the hot water flash evaporation spray header 45 is convenient for uniform flash evaporation. The lower water outlet end of the heater 8 is connected with a hot water flash steam generation tank 19 through a pipeline.
The hot water flash steam generating tank 19 is provided with a steam generating tank automatic valve 41 for controlling the steam quantity and a steam generating tank magnetic flap level gauge 18 for facilitating the observation of the liquid level in the hot water flash steam generating tank 19.
The hot water flash steam generation tank 19 continuously provides stable steam for the heater 8, so that the falling film evaporator can stably evaporate, formaldehyde in the feed liquid becomes steam, and the steam leaves the feed liquid, thereby removing formaldehyde.
The liquid outlet end at the bottom of the second-stage condenser 37 is connected with a chilled water circulating pump 46, and a chilled water return water temperature sensor 23 which is convenient for monitoring the chilled water temperature is arranged on the pipeline, and the chilled water circulating pump 46 is connected to the reverse Carnot circulating heat source refrigerant unit to provide chilled water for the reverse Carnot circulating heat source refrigerant unit. The inverse Carnot cycle heat source refrigerant unit is connected with the second-stage condenser 37, and a chilled water inlet temperature sensor 24 is arranged on a pipeline.
The reverse Carnot cycle heat source refrigerant unit is connected with a second-stage condenser 37 of a single-kettle batch falling film evaporation system through a chilled water circulating pump 46, chilled water passes through the second-stage condenser 37 to obtain heat, and distilled water-formaldehyde vapor condenser generated by the single-kettle batch falling film evaporation system is liquid; the reverse Carnot cycle heat source refrigerant unit is connected with a hot water flash evaporation steam generation tank 19 through a hot water circulating pump 47, and hot water generates negative pressure steam after passing through a hot water flash evaporation spray header 45, wherein the temperature and absolute pressure are 40-60 ℃ and 8-20Kpa respectively. The negative pressure steam enters a heater 8 of the single kettle batch falling film evaporation system, and the negative pressure steam transfers heat to the feed liquid through a tube array heater 8 and then condenses into water to return to a hot water flash evaporation steam generation tank 19.
The hot water circulation pump 47, the reverse carnot circulation heat source refrigerant unit, and the chilled water circulation pump 46 form the reverse carnot circulation heat source-refrigerant system 22. The inverse Carnot cycle heat source-refrigerant system 22 is characterized by high efficiency utilization of heat energy, realization of heat transfer between relatively low temperature heat sources, reasonable heat energy recovery and utilization, reduction of energy waste, energy consumption saving for the system, and power consumption of 150-180kwh for evaporating one ton of water.
The closed vacuum system comprises a water ring vacuum pump 32 connected to a second stage condenser 37, a vacuum water tank 31 connected to the water ring vacuum pump 32 and a plate heat exchanger 38. The connecting pipeline between the second-stage condenser 37 and the water ring vacuum pump 32 is provided with a water ring vacuum pump inlet one-way valve 33, the vacuum water tank 31 is provided with a vacuum water tank magnetic flap level meter 30 which is convenient for monitoring the liquid level of the water ring vacuum pump and a vacuum water tank water supplementing valve 39 which is convenient for supplementing water, the connecting pipeline between the vacuum water tank 31 and the distilled water vortex magnetic pump 27 is provided with a vacuum water tank drainage automatic valve 40, the second-stage condenser 37 is provided with a chilled water magnetic flap level meter 34 which is convenient for monitoring the liquid level of the water ring vacuum pump, a second-stage condenser pressure sensor 36 which is convenient for monitoring the internal pressure of the water ring vacuum pump and an atmosphere communication valve 35 which is convenient for regulating the internal pressure, and the water ring vacuum pump 32 is characterized in that the system generates vacuum to form low-temperature evaporation, and the ammonium glyphosate is not decomposed, and the evaporation temperature and the absolute pressure of feed liquid in the system are 35-50 ℃ and 6-12Kpa.
The water vapor-formaldehyde vapor in the second stage condenser 37 is partially pumped by the water ring vacuum pump 32 and enters the vacuum water tank 31, so that the water level rises. Excess water is drained through the vacuum pitcher drain automatic valve 40. The working water of the water ring vacuum pump 32 is cooled by the plate heat exchanger 38, thereby ensuring the vacuum degree of the system.
The glyphosate finished product after evaporation treatment accords with the national standard, the glyphosate content is more than 30 percent, and the formaldehyde content is less than 0.6g/kg. And meanwhile, the content of glyphosate in the distilled water is less than 0.3 percent.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the claims of the present utility model.
Claims (8)
1. The evaporation system for removing formaldehyde in the glyphosate at low temperature by reverse Carnot cycle is characterized by comprising a single kettle batch falling film evaporation system, a system for removing the glyphosate in steam by rectification, a reverse Carnot cycle-hot water flash evaporation generation system and a closed vacuum system;
The single-kettle batch falling film evaporation system comprises an evaporation liquid storage tank (3), a heater (8), a second-stage condenser (37), a falling film circulating magnetic pump (1) and an evaporation water vortex magnetic pump (27); the heater (8) is arranged at the top of the evaporation storage tank (3), the upper part of the evaporation storage tank (3) is provided with a water inlet and a feed inlet, a pipeline of the second-stage condenser (37) is connected to a steam outlet at the bottom of the heater (8), a liquid outlet pipeline at the bottom of the evaporation storage tank (3) is connected to a liquid inlet at the top of the heater (8), a falling film circulating magnetic pump (1) is arranged on the connecting pipeline, and a pipeline of the evaporation water vortex magnetic pump (27) is connected to a liquid outlet of the second-stage condenser (37);
The system for removing glyphosate in steam through rectification comprises a rectifying tower (9) arranged at the top of an evaporation liquid storage tank (3), a first-stage condenser (15) connected with a steam outlet at the upper part of the rectifying tower (9) and a rectifying tower vortex magnetic circulation pump (14) connected between a feed inlet and a discharge outlet of the rectifying tower (9), wherein the steam outlet at the upper part of the first-stage condenser (15) is communicated with a second-stage condenser (37), and pall ring packing is filled in the rectifying tower (9);
The reverse Carnot cycle-hot water flash evaporation generating system comprises a reverse Carnot cycle heat source refrigerant unit and a hot water flash evaporation steam generating tank (19), wherein the hot water flash evaporation steam generating tank (19) is in cycle communication with the reverse Carnot cycle heat source refrigerant unit, a hot water circulating pump (47) is arranged on a connecting pipeline, a hot water flash evaporation spray header (45) is arranged at a water inlet end in the hot water flash evaporation steam generating tank (19), and a water outlet end at the lower part of a heater (8) is connected with a pipeline of the hot water flash evaporation steam generating tank (19); the second-stage condenser (37) is in circulating communication with the reverse Carnot circulating heat source refrigerant unit, and a chilled water circulating pump (46) is arranged on the connecting pipeline;
The closed vacuum system comprises a water ring vacuum pump (32) connected with the second-stage condenser (37), a vacuum water tank (31) connected with the water ring vacuum pump (32) and a plate heat exchanger (38) for cooling the water ring vacuum pump (32).
2. The evaporation system according to claim 1, wherein a water inlet flowmeter (5) and an evaporation storage tank water inlet automatic valve (43) are installed on a pipeline where a water inlet of the evaporation storage tank (3) is located, a feed flowmeter (7) and an evaporation storage tank feed automatic valve (44) are installed on a pipeline where a feed inlet is located, a heater noncondensable gas discharge valve (6) is installed on a pipeline where a second-stage condenser (37) is connected with a heater (8), a storage tank pressure sensor (12) which is convenient for observing the pressure in the evaporation storage tank (3) and a storage tank magnetic flap liquid level meter (13) which is convenient for observing the liquid level in the evaporation storage tank (3) are arranged on the evaporation storage tank (3), and a discharge valve (2) which is convenient for taking out finished products and a liquid temperature sensor (4) which is convenient for monitoring the liquid temperature are installed on a pipeline where the heater (8) and the evaporation storage tank (3) are connected.
3. The evaporation system according to claim 2, wherein the evaporation water swirl magnetic pump (27) is connected with an evaporation water discharge three-way valve (29) with an evaporation water flow meter (28), and a condensed water discharge one-way valve (25) and a condensed water sampling port (26) are arranged on the connecting pipeline, the condensed water containing formaldehyde is respectively discharged according to the formaldehyde content, and the condensed water sampling port (26) is convenient for sampling and detecting the discharged condensed water containing formaldehyde.
4. An evaporation system according to claim 1, characterized in that the rectifying tower (9) is provided with a heater temperature sensor (10) for monitoring the temperature of the feed liquid and a heater pressure sensor (11) for monitoring the pressure in the rectifying tower (9), a water inlet pipe at the bottom of the first-stage condenser (15) is provided with a water inlet temperature sensor (16) of the cooling tower with a water inlet automatic regulating valve (42) of the cooling tower, and a water outlet pipe is provided with a water outlet temperature sensor (17) of the cooling tower.
5. The evaporation system according to claim 1, wherein a hot water outlet temperature sensor (20) for conveniently monitoring the outlet temperature of the hot water flash evaporation steam generating tank (19) is arranged on a pipeline between a water outlet at the bottom of the hot water flash evaporation steam generating tank (19) and the reverse carnot cycle heat source refrigerant unit, and a hot water return temperature sensor (21) for conveniently monitoring the inlet temperature of the hot water flash evaporation steam generating tank (19) is arranged on a pipeline between the reverse carnot cycle heat source refrigerant unit and a water inlet at the upper part of the hot water flash evaporation steam generating tank (19).
6. An evaporation system according to claim 5, characterized in that the hot water flash steam generation tank (19) is provided with a steam generation tank automatic valve (41) for controlling the steam quantity and a steam generation tank magnetic flap level gauge (18) for facilitating the observation of the liquid level in the hot water flash steam generation tank (19); a chilled water return water temperature sensor (23) which is convenient for monitoring the chilled water temperature is arranged on a pipeline connecting the second-stage condenser (37) and the chilled water circulating pump (46), and a chilled water inlet temperature sensor (24) is arranged on a pipeline connecting the reverse Carnot cycle heat source refrigerant unit and the second-stage condenser (37).
7. An evaporation system according to claim 1, characterized in that a water ring vacuum pump inlet check valve (33) is arranged on the connecting pipeline between the second-stage condenser (37) and the water ring vacuum pump (32), a vacuum water tank magnetic flap level gauge (30) which is convenient for monitoring the liquid level of the vacuum water tank and a vacuum water tank water supplementing valve (39) which is convenient for supplementing water are arranged on the vacuum water tank (31), a vacuum water tank drainage automatic valve (40) is arranged on the connecting pipeline between the vacuum water tank (31) and the distilled water vortex magnetic pump (27), a chilled water magnetic flap level gauge (34) which is convenient for monitoring the liquid level of the second-stage condenser (37), a second-stage condenser pressure sensor (36) which is convenient for monitoring the internal pressure of the second-stage condenser and an atmosphere communication valve (35) which is convenient for adjusting the internal pressure are arranged on the second-stage condenser (37).
8. The vaporization system of claim 1, wherein the vaporization temperature and absolute pressure of the feed solution in the vaporization system are between 35 ℃ and 50 ℃ and between 6 Kpa and 12Kpa, the finished product of glyphosate after vaporization meets the national standard, the glyphosate content is > 30%, the formaldehyde content is < 0.6g/kg, and the glyphosate content in the vaporized water is less than 0.3%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322835659.6U CN221130989U (en) | 2023-10-23 | 2023-10-23 | Evaporation system for removing formaldehyde in glyphosate at low temperature through reverse Carnot cycle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322835659.6U CN221130989U (en) | 2023-10-23 | 2023-10-23 | Evaporation system for removing formaldehyde in glyphosate at low temperature through reverse Carnot cycle |
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| CN221130989U true CN221130989U (en) | 2024-06-14 |
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| CN202322835659.6U Active CN221130989U (en) | 2023-10-23 | 2023-10-23 | Evaporation system for removing formaldehyde in glyphosate at low temperature through reverse Carnot cycle |
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| CN (1) | CN221130989U (en) |
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