CN110624265A - Multistage heating and thermal cycle negative pressure evaporation type solution concentration device - Google Patents
Multistage heating and thermal cycle negative pressure evaporation type solution concentration device Download PDFInfo
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- CN110624265A CN110624265A CN201911028462.3A CN201911028462A CN110624265A CN 110624265 A CN110624265 A CN 110624265A CN 201911028462 A CN201911028462 A CN 201911028462A CN 110624265 A CN110624265 A CN 110624265A
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- negative pressure
- heat exchanger
- concentrated
- pressure evaporation
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- 238000001704 evaporation Methods 0.000 title claims abstract description 143
- 230000008020 evaporation Effects 0.000 title claims abstract description 142
- 238000010438 heat treatment Methods 0.000 title claims abstract description 93
- 239000007788 liquid Substances 0.000 claims abstract description 185
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 121
- 239000003507 refrigerant Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 25
- 238000010792 warming Methods 0.000 claims abstract description 23
- 238000007599 discharging Methods 0.000 claims abstract description 18
- 238000005086 pumping Methods 0.000 claims abstract description 11
- 238000009833 condensation Methods 0.000 claims abstract description 8
- 230000005494 condensation Effects 0.000 claims abstract description 8
- 239000012141 concentrate Substances 0.000 claims description 23
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 238000001802 infusion Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims 2
- 239000012530 fluid Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 12
- 238000012546 transfer Methods 0.000 description 9
- 238000005382 thermal cycling Methods 0.000 description 7
- 230000002528 anti-freeze Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 235000013305 food Nutrition 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 230000009291 secondary effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229930003268 Vitamin C Natural products 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007907 direct compression Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011552 falling film Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium 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
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000019154 vitamin C Nutrition 0.000 description 1
- 239000011718 vitamin C Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0082—Regulation; Control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0094—Evaporating with forced circulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/28—Evaporating with vapour compression
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention provides a negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal circulation, which comprises: a refrigerant circulation assembly; a warming fluid circulation assembly; the concentrated solution conveying assembly comprises a negative pressure evaporation chamber, a water ring vacuum pump and an output device; the circulating pump is used for sending the heated heating liquid into the first heat exchanger and then sending the heated heating liquid back to the liquid storage tank; the first heat exchanger is used for transferring the heat of the heating liquid to the solution to be concentrated, and the water ring vacuum pump is used for pumping the solution into the negative pressure evaporation chamber through the condenser so as to realize that the solution absorbs the heat released in the condensation process of the refrigerant in the condenser; the water ring vacuum pump is also used for conveying water vapor generated by negative pressure evaporation of the solution to be concentrated in the negative pressure evaporation chamber into the liquid storage tank so as to increase the temperature of the heating liquid in the liquid storage tank; the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber. The solution concentration device provided by the invention realizes a high-efficiency low-cost concentration process, and can be widely applied to solution concentration treatment in various fields.
Description
Technical Field
The invention relates to the technical field of solution concentration, in particular to a negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal circulation.
Background
In the prior art, a plurality of researches are carried out on how to fully utilize the heat of secondary steam, namely a multi-effect evaporation mode or a heat pump evaporation mode; the low-temperature concentration technology is mainly researched by fully utilizing the latent heat of secondary steam, preventing energy waste caused by directly discharging the latent heat of evaporated water vapor and reducing material loss and other related problems.
The multiple effects are that the secondary steam of the previous effect is used as a heating source of the next effect, and the temperature of the last effect after condensation is low due to the temperature and the pressure can be discharged into the environment by a vacuum pump. The heat pump evaporation mainly uses secondary steam as a low-temperature heat source, so that partial heat of the secondary steam can be recovered, which is a great step in comparison with the evaporation in the early chemical process. At present, the two forms are frequently adopted in many chemical fields, but the particularity of the evaporation and concentration process of the medical food is not considered.
In the evaporation and concentration operation, the evaporation operation of the heat-sensitive material should be paid sufficient attention because the heat-sensitive material is denatured when meeting high temperature, for example, in the production of the pharmaceutical and food industries, most products are not very heat-resistant, and because the products have biological activity, the products are not suitable for evaporation and concentration at high temperature, and based on the characteristic, the heat-sensitive material is generally required to be evaporated under the low-temperature working condition.
The working process of the existing heat pump type solution concentration technology is that low-temperature steam is compressed by a compressor to improve the temperature and pressure of the steam, the enthalpy of the steam is increased, the steam enters a heat exchanger for condensation, the latent heat of the steam is fully utilized to heat the concentrated solution, and no steam is discharged during working operation. In the multi-effect evaporation process, the secondary steam of a certain effect of the evaporator can not be directly used as a heat source of the effect, but only used as a heat source of secondary effect or secondary effects. For example, the energy must be given to the heat source to increase the temperature (pressure). The vapor jet pump compresses only a portion of the secondary vapor, while the mvr evaporator compresses all of the secondary vapor in the evaporator. The solution circulates in a heating tube in a falling-film evaporator by a material circulating pump. The initial steam is heated outside the pipe by fresh steam, the solution is heated and boiled to generate secondary steam, the generated secondary steam is sucked by a turbine booster fan, and after being boosted, the temperature of the secondary steam is increased and enters a heating chamber as a heating heat source to be circularly evaporated. When the system is normally started, the turbocompressor sucks secondary steam, the secondary steam is changed into heating steam after pressurization, and thus the circulating evaporation is continuously carried out. The evaporated water is finally changed into condensed water to be discharged.
For cost reasons, single stage centrifugal compressors and high pressure blowers are commonly used in mechanical vapor recompression systems. Centrifugal compressors are therefore volume-controlled machines, i.e. the volume flow rate remains almost constant regardless of the suction pressure. The change of the mass flow is proportional to the suction pressure, and the suction pressure is related to the temperature of the solution concentrated by the steam, the higher the temperature is, the larger the pressure is, and the larger the pressure is, the smaller the specific volume is.
The lower the steam temperature, the greater its specific volume, e.g., 100 ℃ saturated steam differs from 20 ℃ saturated steam by a factor of about 20 in specific volume. If the vapor is directly compressed, a large-capacity compressor is required, so that the equipment cost and the operation cost are increased, and the equipment cost and the operation cost are not economical, so that the refrigerant circulation type heat pump type low-temperature evaporation device is better. In addition, in the evaporation process, because many materials have low boiling points, secondary steam is generated to clamp the materials, and the materials are often very corrosive (vitamin C, fruit acid and the like), if the calcium chloride antifreeze solution is concentrated to cause very serious corrosion to equipment, direct compression of the secondary steam means that a compressor is in contact with the secondary steam containing the strongly corrosive materials, so that the compressor is corroded, and the service life of the compressor is seriously influenced. In the multi-effect evaporation, a certain temperature difference is required between the effect and the effect, the temperature difference is required to be not less than 12 ℃ to ensure the evaporation intensity of each effect, if the temperature difference is too small, the energy-saving effect of the increased effect number cannot resist the heat loss in conveying, and the boiling point is increased due to material concentration, so that the temperature difference has large loss. Multiple effect evaporation is typically used for evaporation above 80 ℃. In addition, because steam needs to be introduced in the multi-effect evaporation, the cost of the steam is not good with the rising of the energy price, and therefore the multi-effect evaporation is not as economical as the heat pump evaporation.
In order to save energy, simultaneously reduce the volume of the compressor, prolong the service life of the compressor, reduce the initial investment and improve the economic benefit, the indirect low-temperature heat pump evaporation is generated.
Low-temperature evaporation: 1. the operation temperature is low, the heat energy consumption is less, and the corrosion of the equipment can be effectively restrained; 2. the pretreatment requirement on the feed water is reduced, and the low-temperature evaporation scaling is not serious, so that the requirements on calcium, magnesium and other ions which are easy to scale in the material can be relaxed; 3. the requirement on a heat source is relaxed, and low-grade heat energy can be utilized; 4. certain heat sensitive materials can be processed. But also has the following disadvantages: 1. the heat transfer coefficient is reduced, and the area of the heat exchanger is increased; 2. the specific volume of steam is large during low-temperature operation, the equipment volume is required to be large, the equipment investment is increased, and a vacuum pump is required to maintain a certain vacuum degree, so that the investment on the equipment is increased.
Disclosure of Invention
The invention aims to solve the technical problems that the solution concentration in the prior art cannot utilize heat energy circularly, is low in efficiency and high in cost.
In order to solve the above technical problems, the present invention provides a multi-stage heating and thermal cycling negative pressure evaporation type solution concentration device, comprising:
the refrigerant circulating assembly comprises an evaporator, a throttling device, a condenser and a compressor which are sequentially connected in a surrounding manner;
the heating liquid circulating assembly comprises a liquid storage tank, a circulating pump, a first heat exchanger and a first heat source; the liquid storage tank, the circulating pump and the first heat exchanger are sequentially connected in a surrounding manner, and the first heat source is arranged in the liquid storage tank;
the concentrated solution conveying assembly comprises a negative pressure evaporation chamber, a water ring vacuum pump and an output device, and the condenser, the negative pressure evaporation chamber, the water ring vacuum pump and the liquid storage tank are communicated in sequence; the output device is communicated with the negative pressure evaporation chamber;
the first heat source is used for heating the heating liquid in the liquid storage tank, and the circulating pump is used for sending the heated heating liquid into the first heat exchanger and then sending the heated heating liquid back to the liquid storage tank;
the first heat exchanger is used for transferring the heat of the heated heating liquid to a solution to be concentrated, and then the water ring vacuum pump is used for pumping the solution into the negative pressure evaporation chamber through the condenser so as to realize that the solution absorbs the heat released in the condensation process of the refrigerant in the condenser;
the water ring vacuum pump is also used for enabling the negative pressure evaporation chamber to be in a negative pressure state and sending water vapor generated by negative pressure evaporation of the solution to be concentrated in the negative pressure evaporation chamber into the liquid storage tank so as to increase the temperature of the heating liquid in the liquid storage tank;
and the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber.
Preferably, the solution to be concentrated is directly pumped into the negative pressure evaporation chamber through the condenser after passing through the first heat exchanger.
Preferably, the concentrate delivery assembly further comprises a concentrate tank;
the concentrated solution tank is communicated with the first heat exchanger, and a solution to be concentrated flows through the first heat exchanger from the concentrated solution tank and is pumped into the negative pressure evaporation chamber through the condenser;
or; the first heat exchanger is arranged in the concentrated solution box, and after a solution to be concentrated flows into the concentrated solution box, the solution is pumped into the negative pressure evaporation chamber through the condenser.
Preferably, the concentrated solution conveying assembly further comprises a first control valve and a first liquid level controller, the first control valve is arranged in the concentrated solution tank, the first liquid level controller is arranged in the concentrated solution tank, a solution to be concentrated flows into the concentrated solution tank from the first control valve, the first liquid level controller is used for detecting a liquid level height value of the solution to be concentrated in the concentrated solution tank, and when the liquid level height value reaches a preset height value, the first liquid level controller is further used for controlling the refrigerant circulation assembly, the temperature rising liquid circulation assembly and the water ring vacuum pump to be started.
Preferably, the concentrate delivery assembly further comprises an auxiliary pump; the auxiliary pump is used for assisting the water ring vacuum pump to pump the solution into the negative pressure evaporation chamber through the condenser;
when the first heat exchanger is arranged in the concentrated solution tank, the auxiliary pump is connected with the concentrated solution tank and the condenser;
when the concentrate tank is communicated with the first heat exchanger, the auxiliary pump is connected with the first heat exchanger and the condenser.
Preferably, when the concentrated solution tank is communicated with the first heat exchanger, the concentrated solution conveying assembly further comprises an infusion set, and the concentrated solution tank is communicated with the first heat exchanger through the infusion set.
Preferably, the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber to the outside;
or the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber into the concentrated solution box.
Preferably, the circulating pump is further used for sending the heated heating liquid to the water ring vacuum pump through the evaporator;
and/or the heating liquid circulating assembly further comprises a second heat exchanger, and the water ring vacuum pump is communicated with the liquid storage tank through the second heat exchanger;
and the circulating pump is also used for conveying the heated heating liquid into the second heat exchanger through the evaporator.
Preferably, the warming liquid circulating assembly further comprises an inflow valve and a water inlet valve, the inflow valve is connected with the circulating pump and the evaporator, and the water inlet valve is connected with the evaporator and the water ring vacuum pump;
when the temperature raising liquid circulation assembly further comprises a second heat exchanger, the temperature raising liquid circulation assembly further comprises a regulating valve, a drain pipe, a side inlet valve and a side outlet valve, the regulating valve is connected with the evaporator and the second heat exchanger, the drain pipe is communicated with the second heat exchange, the side inlet valve is communicated with the drain pipe and the liquid storage tank, and the side outlet valve is located between the evaporator and the regulating valve and connected with the evaporator.
In order to solve the above technical problem, the present invention further provides a negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal cycle, comprising:
the refrigerant circulating assembly comprises an evaporator, a throttling device, a condenser and a compressor which are sequentially connected in a surrounding manner;
the heating liquid circulating assembly comprises a liquid storage tank, a circulating pump, a first heat exchanger, a first heat source and a second heat exchanger; the liquid storage tank, the circulating pump and the first heat exchanger are sequentially connected in a surrounding manner, and the first heat source is arranged in the liquid storage tank;
the concentrated solution conveying assembly comprises a negative pressure evaporation chamber, a water ring vacuum pump and an output device, and the condenser, the negative pressure evaporation chamber, the water ring vacuum pump, the second heat exchanger and the liquid storage tank are communicated in sequence; the output device is communicated with the negative pressure evaporation chamber;
the first heat source is used for heating the heating liquid in the liquid storage tank, and the circulating pump is used for sending the heated heating liquid into the first heat exchanger and then sending the heated heating liquid back to the liquid storage tank;
the first heat exchanger is used for transferring the heat of the heated heating liquid to a solution to be concentrated, and then the water ring vacuum pump is used for pumping the solution into the negative pressure evaporation chamber after sequentially sending the solution into the second heat exchanger and the condenser so as to help the solution to absorb heat for the second time and raise the temperature;
the water ring vacuum pump is also used for enabling the negative pressure evaporation chamber to be in a negative pressure state, and sending water vapor generated by negative pressure evaporation of the solution to be concentrated in the negative pressure evaporation chamber into the liquid storage tank through the second heat exchanger so as to raise the temperature of the heating liquid in the liquid storage tank;
and the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber.
In the multi-stage heating and heat circulation negative pressure evaporative solution concentration device provided by the invention, the first heat source is used for heating the heating liquid in the liquid storage tank, and the circulating pump is used for sending the heated heating liquid into the first heat exchanger and then sending the heating liquid back to the liquid storage tank; the first heat exchanger is used for transferring the heat of the heated heating liquid to a solution to be concentrated, and then the water ring vacuum pump is used for pumping the solution into the negative pressure evaporation chamber through the condenser so as to realize that the solution absorbs the heat released in the condensation process of the refrigerant in the condenser; the water ring vacuum pump is also used for enabling the negative pressure evaporation chamber to be in a negative pressure state and sending water vapor generated by negative pressure evaporation of the solution to be concentrated in the negative pressure evaporation chamber into the liquid storage tank so as to increase the temperature of the heating liquid in the liquid storage tank; and the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber. The negative pressure evaporation type solution concentration device provided by the invention heats the solution to be concentrated for at least 2 times through the heat circulation of the refrigerant and the heating liquid, improves the concentration efficiency, reduces the concentration and heating cost, and realizes the heat energy recycling of the system. The system has the advantages that three fluids exchange heat with each other, and finally, water in the solution is discharged out of a circulating system in a low-temperature liquid water mode in the mass transfer and heat transfer processes, so that solution concentration with low cost is realized.
The solution concentration device provided by the invention realizes a high-efficiency low-cost concentration process, and can be widely applied to seawater desalination, food and medicine, sewage treatment, petrochemical industry and concentrated treatment of antifreeze solution of a heat source tower of a central air conditioner.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of a multi-stage temperature-rise and thermal-cycle negative pressure evaporative solution concentration device according to the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the multiple temperature rise and thermal cycle negative pressure evaporative solution concentration device according to the present invention;
FIG. 3 is a schematic diagram of the design of a third embodiment of the negative pressure evaporative solution concentration device with multi-stage heating and thermal cycling provided by the present invention;
FIG. 4 is a schematic diagram of the design of a fourth embodiment of the negative pressure evaporative solution concentration device with multi-stage heating and thermal cycling provided by the present invention;
fig. 5 is a schematic design diagram of a fifth embodiment of the negative pressure evaporative solution concentration device with multi-stage temperature rise and thermal cycle provided by the invention.
The reference numbers illustrate:
refrigerant circulation component, 12-evaporator, 3-condenser, 9-throttling device, 10-compressor;
the system comprises a heating liquid circulating component, 6-a first heat exchanger, 17-a liquid storage tank, 13-a circulating pump, 15-a first heat source, 11-an inflow valve, 20-a regulating valve, 19-a second heat exchanger, 16-a drain pipe, 18-a bypass inlet valve, 14-a bypass outlet valve and 21-a water inlet valve;
the system comprises a concentrated solution conveying assembly, a 2-negative pressure evaporation chamber, a 1-water ring vacuum pump, an output device, a 23-auxiliary pump, a 5-concentrated solution box, a 4-first control valve, a 24-first liquid level controller, an infusion apparatus and a 25-liquid outlet pipe;
7-second control valve, 8-output pump, switch valve (not shown), 26-input pump.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
The invention provides a negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal circulation.
First embodiment
Referring to fig. 1, the negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal cycle includes:
the refrigerant circulating assembly comprises an evaporator 12, a throttling device 9, a condenser 3 and a compressor 10 which are sequentially connected in a surrounding manner;
the heating liquid circulating assembly comprises a liquid storage tank 17, a circulating pump 13, a first heat exchanger 6 and a first heat source 15; the liquid storage tank 17, the circulating pump 13 and the first heat exchanger 6 are sequentially connected in a surrounding manner, and the first heat source 15 is arranged in the liquid storage tank 17;
the concentrated solution conveying assembly comprises a negative pressure evaporation chamber 2, a water ring vacuum pump 1 and an output device, wherein the condenser 3, the negative pressure evaporation chamber 2, the water ring vacuum pump 1 and the liquid storage tank 17 are communicated in sequence; the output device is communicated with the negative pressure evaporation chamber 2;
the first heat source 15 is used for heating the warming liquid in the liquid storage tank 17, and the circulating pump 13 is used for sending the heated warming liquid into the first heat exchanger 6 and then sending the warming liquid back to the liquid storage tank 17;
the first heat exchanger 6 is used for transferring the heat of the heated heating liquid to the solution to be concentrated, and then the water ring vacuum pump 1 is used for pumping the solution into the negative pressure evaporation chamber 2 through the condenser 3 so as to realize that the solution absorbs the heat released in the condensation process of the refrigerant in the condenser 3;
the water ring vacuum pump 1 is also used for enabling the negative pressure evaporation chamber 2 to be in a negative pressure state, and sending water vapor generated by negative pressure evaporation of a solution to be concentrated in the negative pressure evaporation chamber 2 into the liquid storage tank 17 so as to raise the temperature of the warming liquid in the liquid storage tank 17;
the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber 2.
In the multi-stage heating and heat circulation negative pressure evaporative solution concentration device provided by the invention, the first heat source 15 is used for heating the heating liquid in the liquid storage tank 17, and the circulating pump 13 is used for sending the heated heating liquid into the first heat exchanger 6 and then sending the heated heating liquid back to the liquid storage tank 17; the first heat exchanger 6 is used for transferring the heat of the heated heating liquid to the solution to be concentrated, and then the water ring vacuum pump 1 is used for pumping the solution into the negative pressure evaporation chamber 2 through the condenser 3 so as to realize that the solution absorbs the heat released in the condensation process of the refrigerant in the condenser 3; the water ring vacuum pump 1 is also used for enabling the negative pressure evaporation chamber 2 to be in a negative pressure state, and sending water vapor generated by negative pressure evaporation of a solution to be concentrated in the negative pressure evaporation chamber 2 into the liquid storage tank 17 so as to raise the temperature of the warming liquid in the liquid storage tank 17; the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber 2. The negative pressure evaporation type solution concentration device provided by the invention heats the solution to be concentrated for at least 2 times through the heat circulation of the refrigerant and the heating liquid, improves the concentration efficiency, reduces the concentration and heating cost, and realizes the heat energy recycling of the system.
In this embodiment, the concentrate delivery assembly may further comprise a concentrate tank 5.
The first heat exchanger 6 is arranged in the concentrated solution tank 5, and after the solution to be concentrated flows into the concentrated solution tank 5, the solution is pumped into the negative pressure evaporation chamber 2 through the condenser 3.
It will be appreciated that in other embodiments the concentrate delivery assembly may not include the concentrate tank 5. The solution to be concentrated is directly pumped into the negative pressure evaporation chamber 2 through the condenser 3 after passing through the first heat exchanger 6.
The concentrated solution conveying assembly further comprises a first control valve 4 and a first liquid level controller 24, the first control valve 4 is arranged in the concentrated solution box 5, the first liquid level controller 24 is arranged in the concentrated solution box 5, a solution to be concentrated flows into the concentrated solution box 5 from the first control valve 4, the first liquid level controller is used for detecting a liquid level height value of the solution to be concentrated in the concentrated solution box 5, and when the liquid level height value reaches a preset height value, the first liquid level controller 24 is further used for controlling the refrigerant circulation assembly, the temperature raising liquid circulation assembly and the water ring vacuum pump 1 to be started.
The concentrate delivery assembly further comprises an auxiliary pump 23; the auxiliary pump 23 is used for assisting the water ring vacuum pump 1 to pump the solution into the negative pressure evaporation chamber 2 through the condenser 3; the auxiliary pump 23 connects the concentrate tank 5 and the condenser 3.
The output device is used for discharging the concentrated solution from the negative pressure evaporation chamber 2 to the outside. In this embodiment, the output device includes a second control valve 7 and an output pump 8, and the second control valve 7 connects the negative pressure evaporation chamber 2 and the output pump 8.
The circulating pump 13 is also used for conveying the heated heating liquid into the water ring vacuum pump 1 through the evaporator 12;
the heating liquid circulating assembly further comprises a second heat exchanger 19, and the water ring vacuum pump 13 is communicated with the liquid storage tank 17 through the second heat exchanger 19;
the circulating pump 13 is further configured to send the heated warming liquid to the second heat exchanger 19 through the evaporator 12.
The warming liquid circulating assembly further comprises an inflow valve 11 and a water inlet valve 21, the inflow valve 11 is connected with the circulating pump 13 and the evaporator 12, and the water inlet valve 21 is connected with the evaporator 12 and the water ring vacuum pump 1;
the heating liquid circulating assembly further comprises a regulating valve 20, a drain pipe 16, a bypass valve 18 and a bypass outlet valve 14, the regulating valve 20 is connected with the evaporator 12 and the second heat exchanger 19, the drain pipe 16 is communicated with the second heat exchanger, the bypass valve 18 is communicated with the drain pipe 16 and the liquid storage tank 17, and the bypass outlet valve 14 is located between the evaporator 12 and the regulating valve 20 and is connected with the evaporator 12.
In this embodiment, the flow rate of the solution to be concentrated is very stable.
Second embodiment
Referring to fig. 2, based on the negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal cycle provided by the first embodiment of the present invention, the second embodiment of the present invention provides another negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal cycle, which is different from the first embodiment in that:
the negative pressure evaporation type solution concentration device with the multi-stage temperature rise and heat circulation does not comprise a second heat exchanger 19, and the water ring vacuum pump 1 is directly communicated with the liquid storage tank 17. The circulating pump 13 is also used for conveying the heated heating liquid to the water ring vacuum pump 1 through the evaporator 12.
The heating liquid circulating assembly further comprises an inflow valve 11, the inflow valve 11 is connected with the circulating pump 13 and the evaporator 12, and the evaporator 12 is directly communicated with the water ring vacuum pump 1.
In this embodiment, the concentrate delivery assembly may further comprise a concentrate tank 5. The concentrated solution tank 5 is communicated with the first heat exchanger 6, and the solution to be concentrated flows through the first heat exchanger 6 from the concentrated solution tank 5 and is pumped into the negative pressure evaporation chamber 2 through the condenser 3;
the concentrate delivery assembly further comprises an auxiliary pump 23; the auxiliary pump 23 is used for assisting the water ring vacuum pump 1 to pump the solution into the negative pressure evaporation chamber 2 through the condenser 3; the auxiliary pump 23 connects the first heat exchanger 6 and the condenser 3.
In this embodiment, the concentrated solution conveying assembly further comprises an infusion apparatus, and the concentrated solution tank 5 is communicated with the first heat exchanger 6 through the infusion apparatus.
As a preferable mode of the present embodiment, the infusion device may be an on-off valve, the concentrate tank 5 may be located above the first heat exchanger 6, and the on-off valve connects the bottom end of the concentrate tank 5 and the first heat exchanger 6.
The circulating pump 13 is also used for conveying the heated heating liquid to the water ring vacuum pump 1 through the evaporator 12.
The output device is used for discharging the concentrated solution from the negative pressure evaporation chamber 2 to the concentrated solution tank 5. The output device comprises a second control valve 7 and an output pump 8, and the negative pressure evaporation chamber 2, the second control valve 7, the output pump 8 and the concentrated solution tank 5 are sequentially connected.
Third embodiment
Referring to fig. 3, based on the multi-stage heating and thermal cycling negative pressure evaporation type solution concentration device provided by the second embodiment of the present invention, a third embodiment of the present invention provides another multi-stage heating and thermal cycling negative pressure evaporation type solution concentration device, which is different in that the heating liquid cycling assembly further includes a second heat exchanger 19, and the water ring vacuum pump 13 is communicated with the liquid storage tank 17 through the second heat exchanger 19; the circulating pump 13 is also used for conveying the heated heating liquid into the water ring vacuum pump 1 through the evaporator 12; the circulating pump 13 is further configured to send the heated warming liquid to the second heat exchanger 19 through the evaporator 12.
The warming liquid circulating assembly further comprises an inflow valve 11, a regulating valve 20, a drain pipe 16, a side inflow valve 18, a side outflow valve 14 and a water inflow valve 21, the inflow valve 11 is connected with the circulating pump 13 and the evaporator 12, the regulating valve 20 is connected with the evaporator 12 and the second heat exchanger 19, the drain pipe 16 is communicated with the second heat exchange, the side inflow valve 18 is communicated with the drain pipe 16 and the liquid storage tank 17, the side outflow valve 14 is located between the evaporator 12 and the regulating valve 20 and connected with the evaporator 12, and the water inflow valve 21 is connected with the evaporator 12 and the water ring vacuum pump 1.
The output device is used for discharging the concentrated solution from the negative pressure evaporation chamber 2 to the concentrated solution tank 5.
In this embodiment, the working principle of the negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal cycle is as follows:
the solution to be concentrated flows into the concentrated solution tank 5 through the first control valve 4, and when the solution to be concentrated in the concentrated solution tank 5 is accumulated to a preset liquid level height, the first liquid level controller 24 instructs the refrigerant circulation assembly, the warming solution circulation assembly and the water ring vacuum pump 1 to start working.
The solution to be concentrated enters the first heat exchanger 6 through the infusion apparatus to obtain the heat of the temperature rising liquid on the other side.
The concentrated solution is heated for the first time and then is pressed into the condenser 3 through the solution side outlet of the first heat exchanger 6 by the auxiliary pump 23 to obtain the latent heat of the refrigerant (refrigerant) at the other side of the heat exchanger for further heating.
The liquid refrigerant enters the evaporator 12 again through the throttling device 9 to absorb the latent heat of the warming liquid at the other side of the evaporator 12 to be evaporated, and the evaporated refrigerant is pressed into the condenser 3 by the compressor 10 again to heat the solution to be concentrated for the second time, thus the circulation process of the refrigerant is completed repeatedly.
The solution to be concentrated after the secondary temperature rise is sucked into the negative pressure evaporation chamber 2 by the auxiliary pump 23 and the water ring vacuum pump 1 under the action of double pumps to be sprayed and evaporated.
The solution after the concentration process is sucked out by the output pump 8 through the first control valve 4, and is pumped into the concentrated solution tank 5 to be fully mixed with the solution which is not concentrated in the tank, and then is sucked into the first heat exchanger 6 by the auxiliary pump 23 again, and is pumped into the condenser 3 by the auxiliary pump 23 to obtain the latent heat of the refrigerant to obtain the secondary temperature rise.
Then the water is sucked into the negative pressure evaporation chamber 2 by the water ring vacuum pump 1 to realize the processes of negative pressure evaporation and solution concentration, thus completing the circulation process of the concentrated solution.
The circulating pump 13 pumps the heating liquid out of the liquid storage tank 17 to be divided into two paths, one path enters the first heat exchanger 6 for the first time to heat and exchange heat for the solution to be concentrated, and then the heating liquid returns to the liquid storage tank 17 again.
The other path enters the evaporator 12 through the inlet valve 11 to release latent heat to the refrigerant on the other side of the evaporator 12, and the warming liquid after releasing latent heat flows out of the evaporator 12 and is divided into two paths through a pipeline.
One enters the water ring vacuum pump 1 through the water inlet valve 21 and serves as sealed working water.
The other stream enters a second heat exchanger 19 through a regulating valve 20 to condense the water vapor discharged from the water ring vacuum pump 1 on the other side of the heat exchanger.
The bypass valve 14 may be opened appropriately to raise the temperature of the warming liquid in order to avoid waste of heat energy, and the bypass valve 14 is provided at the low-temperature circulation water pipe out of the evaporator 12.
The water vapor evaporated from the solution to be concentrated in the negative pressure evaporation is discharged into the second heat exchanger 19 by the water ring vacuum pump 1, and the water vapor is condensed into liquid water by the low-temperature heating liquid on the other side of the heat exchanger and then enters the liquid storage tank 17 to be fully mixed with the heating liquid.
The low temperature heating liquid in the second heat exchanger 19 obtains the latent heat of the water vapor part, and then enters the water storage tank through the water discharge pipe 16 or is discharged to the environment.
Alternatively, a portion of the low temperature raising liquid may be re-introduced into the reservoir 17 through the by-pass valve 18, thus achieving a circulation of the entire circulating water.
The first heat source 15 may be an electrically heated rod and the reservoir 17 may also have a heat source from another aspect, for example, heat from another condenser 3.
The refrigerant is continuously circulated in the refrigerant circulation assembly, the heating liquid works through the circulating pump 13 to realize the circulation process, the solution to be concentrated realizes the circulation process of the concentrated solution through the output pump 8 and the auxiliary pump 23, the assistance of the water ring vacuum pump 1 is certainly not left, and the concentrated solution circulation and the concentrated process are finally realized.
When the solution in the concentrated solution tank 5 is reduced to the preset concentration requirement in the concentrated solution tank 5, the liquid level of the solution is also reduced and is lower than the preset liquid level height value.
The first liquid level controller 24 instructs the water-ring vacuum pump 1, the refrigerant circulation component, the warming liquid circulation component and the output pump 8 to stop working, and the corresponding valves are also closed or opened, so that the concentrated solution flows out of the concentrated solution tank or enters the next process cycle after the concentration task is completed, or the working pump in the next process cycle sucks out the concentrated solution, thereby completing the circulation process of the concentrated solution.
In this embodiment, the flow rate of the solution to be concentrated is changed frequently.
Fourth embodiment
Referring to fig. 4, based on the multi-stage temperature-raising and thermal-cycling negative pressure evaporation type solution concentration device provided by the third embodiment of the present invention, a fourth embodiment of the present invention provides another multi-stage temperature-raising and thermal-cycling negative pressure evaporation type solution concentration device, which is different in that the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber 2 to the outside.
In this embodiment, the flow rate of the solution to be concentrated is relatively stable.
Fifth embodiment
Referring to fig. 5, a fifth embodiment of the present invention provides another negative pressure evaporation type solution concentration device with multi-stage temperature rise and heat cycle, different from the negative pressure evaporation type solution concentration device with multi-stage temperature rise and heat cycle provided in the first to fourth embodiments.
The negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal circulation comprises:
the refrigerant circulating assembly comprises an evaporator 12, a throttling device 9, a condenser 3 and a compressor 10 which are sequentially connected in a surrounding manner;
the heating liquid circulating assembly comprises a liquid storage tank 17, a circulating pump 13, a first heat exchanger 6, a first heat source 15 and a second heat exchanger 19; the liquid storage tank 17, the circulating pump 13 and the first heat exchanger 6 are sequentially connected in a surrounding manner, and the first heat source 15 is arranged in the liquid storage tank 17;
the concentrated solution conveying assembly comprises a negative pressure evaporation chamber 2, a water ring vacuum pump 1 and an output device, and the condenser 3, the negative pressure evaporation chamber 2, the water ring vacuum pump 1, the second heat exchanger 19 and the liquid storage tank 17 are communicated in sequence; the output device is communicated with the negative pressure evaporation chamber 2;
the first heat source 15 is used for heating the warming liquid in the liquid storage tank 17, and the circulating pump 13 is used for sending the heated warming liquid into the first heat exchanger 6 and then sending the warming liquid back to the liquid storage tank 17;
the first heat exchanger 6 is used for transferring the heat of the heated heating liquid to the solution to be concentrated, and then the water ring vacuum pump 1 is used for sending the solution into the second heat exchanger 19 and the condenser 3 in sequence and pumping the solution into the negative pressure evaporation chamber 2 to help the solution to absorb heat and heat for three times;
the water ring vacuum pump 1 is further configured to enable the negative pressure evaporation chamber 2 to be in a negative pressure state, and send water vapor generated by negative pressure evaporation of a solution to be concentrated in the negative pressure evaporation chamber 2 into the liquid storage tank 17 through the second heat exchanger 19, so as to raise the temperature of the warming liquid in the liquid storage tank 17;
the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber 2.
The circulating pump 13 is also used for conveying the heated heating liquid into the water ring vacuum pump 1 through the evaporator 12; the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber 2 to the concentrated solution tank 5.
The infusion apparatus is an input pump 26, and the input pump 26 is used for pumping the solution to be concentrated in the concentrated solution tank 5 into the first heat exchanger 6.
The obvious characteristic of this embodiment lies in adopting tertiary intensification mode to carry out the intensification to being concentrated solution, and the solution that first intensification was sent into first heat exchanger 6 through circulating pump 13 and is the low temperature by concentrated solution heating, and the solution that first intensification is sent into first heat exchanger 6 by input pump 26 and is carried out the heat exchange.
After the temperature of the solution is raised for the first time, the solution enters the second heat exchanger 19 to obtain the latent heat of the water vapor discharged from the water ring vacuum pump 1.
After acquiring the latent heat of the water vapor, the solution enters the condenser 3 to acquire the latent heat of the refrigerant.
The solution to be concentrated is heated up three times, which is advantageous for reducing the power of the heat pump compressor 10, and the energy efficiency ratio is further improved.
Further, the provided concentrated solution tank 5 can be provided with a plurality of spare concentrated solution tanks, and the flow rate of the solution to be concentrated is changed frequently, so that the solution to be concentrated is prevented from overflowing and being wasted.
For example, in the heat source tower of the central air conditioner, the rate at which the antifreeze is diluted is often changed due to weather, and the amount of the antifreeze overflowing is also often changed, and therefore, it is necessary to provide a level controller for controlling the start and stop of the water ring vacuum pump 1 and the circulating water pump in the prepared concentrate tank.
In addition, a liquid level controller is required to be arranged in the negative pressure evaporation chamber 2 to control the output working frequency of the output pump 8, so as to prevent the exhaust pump from pumping empty or the exhaust amount from being insufficient; the resulting solution is sucked in by the water ring vacuum pump 1.
The solution pipeline flowing out of the negative pressure evaporation chamber 2 can be provided with a check valve, for example, the second control valve 7 can be a check valve to prevent concentrated solution from being sucked into the water ring vacuum pump 1, in addition, the solution can be further prevented from entering the water ring vacuum pump 1, and a solution inflow blocking device is added at the pipeline opening of the water ring vacuum pump 1.
The invention has high efficiency and energy saving, can recycle heat energy, can repeatedly recycle heat energy during working as long as the circulating water is heated to about 45 ℃ and the heat energy is stored and preserved, and does not need to heat the circulating water any more, because the heat of the circulating water is transferred by a heat pump and then can be returned to the circulating water again through the latent heat of water vapor generated in the concentration process, the initial heat is transferred and then recovered, and then is transferred again, and the purpose of efficiently concentrating the solution is achieved by two-stage heating modes of evaporating and condensing, absorbing latent heat, releasing latent heat and the concentrated solution.
The method can be widely applied to food and medicine ranks needing concentration, seawater desalination, the field of chemical engineering, sewage treatment and concentration of antifreeze solution of a heat source tower of a central air conditioner.
The invention takes the factors that the steam pressure is too low and the specific volume is larger into consideration, and simultaneously takes the factors that the material loss and the energy waste are increased due to too high temperature into consideration, and adopts a better compromise scheme under the balance of the two factors: the material temperature is controlled between 82 ℃ and 85 ℃, so that the equipment investment cost can be reduced, the efficiency of the concentrated solution can be greatly improved, namely the concentrated temperature is between multi-effect evaporation and heat pump refrigerant circulation type heat pump type low-temperature evaporation, the reduction of a heat transfer coefficient can be avoided, the area of a heat exchanger does not need to be increased, the specific volume of steam during operation is not too large, the volume of equipment is required to be correspondingly reduced, the equipment investment is reduced, the vacuum degree is not too high, the consumption of electric energy is reduced, and the excessive consumption of heat energy due to the latent heat absorption during the phase change of the concentrated solution can be avoided.
This is greatly different from the related inventions and utility model patents previously filed, and the related concentrated inventions (negative pressure low temperature heat pump type concentrating device, patent No. 201910781092.4, and utility model patent No. 201921374643.7) filed earlier do not comprehensively consider the relationship between the specific volume of steam and the concentration efficiency, and only once heat up the concentrated solution, which cannot reduce the specific volume of steam and also consume too much power of the compressor 10. The invention further improves the efficiency, firstly feeds back part of the latent heat of the water vapor to the solution to be concentrated through the heat exchanger to obtain the primary temperature rise, then transfers the latent heat of the circulating water to a higher temperature place through the heat pump, and heats the solution to be concentrated for the second time through the secondary temperature rise condenser 3. Although the related patent in the previous paragraph also utilizes the water ring vacuum pump 1 to generate vacuum and play roles in mass transfer and heat transfer, and also utilizes the heat pump to feed back latent heat of water vapor, the fed-back heat cannot meet higher temperature requirements easily, even if the temperature is reached, the energy efficiency ratio is very low, and the power of the motor of the heat pump unit configured with the patent is very large. The invention is not that, it uses the water ring vacuum pump 1 to increase the temperature of the circulating water in the process of mass and heat transfer, the concentrated solution is decreased in temperature, and uses the temperature difference between the two fluids to exchange part of the circulating water heat to the solution to be concentrated through the heat exchanger, and the other part of the circulating water transfers its heat to the higher part through the heat pump to exchange to the concentrated solution entering the negative pressure evaporation cavity, so the concentrated solution can reach the ideal and more economical specific volume temperature state through two-stage temperature increase, and the power of the heat pump set can be greatly reduced.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A multi-stage heating and thermal cycle negative pressure evaporation type solution concentration device is characterized by comprising:
the refrigerant circulating assembly comprises an evaporator, a throttling device, a condenser and a compressor which are sequentially connected in a surrounding manner;
the heating liquid circulating assembly comprises a liquid storage tank, a circulating pump, a first heat exchanger and a first heat source; the liquid storage tank, the circulating pump and the first heat exchanger are sequentially connected in a surrounding manner, and the first heat source is arranged in the liquid storage tank;
the concentrated solution conveying assembly comprises a negative pressure evaporation chamber, a water ring vacuum pump and an output device, and the condenser, the negative pressure evaporation chamber, the water ring vacuum pump and the liquid storage tank are communicated in sequence; the output device is communicated with the negative pressure evaporation chamber;
the first heat source is used for heating the heating liquid in the liquid storage tank, and the circulating pump is used for sending the heated heating liquid into the first heat exchanger and then sending the heated heating liquid back to the liquid storage tank;
the first heat exchanger is used for transferring the heat of the heated heating liquid to a solution to be concentrated, and then the water ring vacuum pump is used for pumping the solution into the negative pressure evaporation chamber through the condenser so as to realize that the solution absorbs the heat released in the condensation process of the refrigerant in the condenser;
the water ring vacuum pump is also used for enabling the negative pressure evaporation chamber to be in a negative pressure state and sending water vapor generated by negative pressure evaporation of the solution to be concentrated in the negative pressure evaporation chamber into the liquid storage tank so as to increase the temperature of the heating liquid in the liquid storage tank;
and the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber.
2. The negative pressure evaporative solution concentrating device according to claim 1, wherein the solution to be concentrated is directly passed through the first heat exchanger and then drawn into the negative pressure evaporation chamber through the condenser.
3. The negative pressure evaporative solution concentration device according to claim 1, wherein the concentrate delivery assembly further comprises a concentrate tank;
the concentrated solution tank is communicated with the first heat exchanger, and a solution to be concentrated flows through the first heat exchanger from the concentrated solution tank and is pumped into the negative pressure evaporation chamber through the condenser;
or; the first heat exchanger is arranged in the concentrated solution box, and after a solution to be concentrated flows into the concentrated solution box, the solution is pumped into the negative pressure evaporation chamber through the condenser.
4. The negative pressure evaporative solution concentration device according to claim 3, wherein the concentrated solution delivery assembly further comprises a first control valve and a first level controller, the first control valve is disposed in the concentrated solution tank, the first level controller is disposed in the concentrated solution tank, and the solution to be concentrated flows into the concentrated solution tank from the first control valve, wherein the first level controller is configured to detect a level height of the solution to be concentrated in the concentrated solution tank, and when the level height reaches a preset height, the first level controller is further configured to control the refrigerant circulation assembly, the warming solution circulation assembly and the water ring vacuum pump to be activated.
5. The negative pressure evaporative solution concentration device according to claim 3, wherein the concentrate delivery assembly further comprises an auxiliary pump; the auxiliary pump is used for assisting the water ring vacuum pump to pump the solution into the negative pressure evaporation chamber through the condenser;
when the first heat exchanger is arranged in the concentrated solution tank, the auxiliary pump is connected with the concentrated solution tank and the condenser;
when the concentrate tank is communicated with the first heat exchanger, the auxiliary pump is connected with the first heat exchanger and the condenser.
6. The negative pressure evaporative solution concentration device according to claim 3, wherein when the concentrate tank is in communication with the first heat exchanger, the concentrate delivery assembly further comprises an infusion set through which the concentrate tank is in communication with the first heat exchanger.
7. The negative pressure evaporative solution concentrating device according to any one of claims 3 to 6, wherein the output device is configured to discharge the concentrated solution from the negative pressure evaporation chamber to the outside;
or the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber into the concentrated solution box.
8. The negative pressure evaporative solution concentration device according to claim 1, wherein the circulating pump is further configured to feed the heated warming solution to the water ring vacuum pump through the evaporator;
and/or the heating liquid circulating assembly further comprises a second heat exchanger, and the water ring vacuum pump is communicated with the liquid storage tank through the second heat exchanger;
and the circulating pump is also used for conveying the heated heating liquid into the second heat exchanger through the evaporator.
9. The negative pressure evaporative solution concentration device according to claim 8, wherein the warming solution circulation module further comprises an inflow valve and a water inlet valve, the inflow valve connects the circulation pump and the evaporator, and the water inlet valve connects the evaporator and the water ring vacuum pump;
when the temperature raising liquid circulation assembly further comprises a second heat exchanger, the temperature raising liquid circulation assembly further comprises a regulating valve, a drain pipe, a side inlet valve and a side outlet valve, the regulating valve is connected with the evaporator and the second heat exchanger, the drain pipe is communicated with the second heat exchange, the side inlet valve is communicated with the drain pipe and the liquid storage tank, and the side outlet valve is located between the evaporator and the regulating valve and connected with the evaporator.
10. A multi-stage heating and thermal cycle negative pressure evaporation type solution concentration device is characterized by comprising:
the refrigerant circulating assembly comprises an evaporator, a throttling device, a condenser and a compressor which are sequentially connected in a surrounding manner;
the heating liquid circulating assembly comprises a liquid storage tank, a circulating pump, a first heat exchanger, a first heat source and a second heat exchanger; the liquid storage tank, the circulating pump and the first heat exchanger are sequentially connected in a surrounding manner, and the first heat source is arranged in the liquid storage tank;
the concentrated solution conveying assembly comprises a negative pressure evaporation chamber, a water ring vacuum pump and an output device, and the condenser, the negative pressure evaporation chamber, the water ring vacuum pump, the second heat exchanger and the liquid storage tank are communicated in sequence; the output device is communicated with the negative pressure evaporation chamber;
the first heat source is used for heating the heating liquid in the liquid storage tank, and the circulating pump is used for sending the heated heating liquid into the first heat exchanger and then sending the heated heating liquid back to the liquid storage tank;
the first heat exchanger is used for transferring the heat of the heated heating liquid to a solution to be concentrated, and then the water ring vacuum pump is used for pumping the solution into the negative pressure evaporation chamber after sequentially sending the solution into the second heat exchanger and the condenser so as to help the solution to absorb heat for the second time and raise the temperature;
the water ring vacuum pump is also used for enabling the negative pressure evaporation chamber to be in a negative pressure state, and sending water vapor generated by negative pressure evaporation of the solution to be concentrated in the negative pressure evaporation chamber into the liquid storage tank through the second heat exchanger so as to raise the temperature of the heating liquid in the liquid storage tank;
and the output device is used for discharging the concentrated solution from the negative pressure evaporation chamber.
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