CN210933825U - Multi-stage heating and thermal circulation negative pressure evaporation type solution concentration device - Google Patents
Multi-stage heating and thermal circulation negative pressure evaporation type solution concentration device Download PDFInfo
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- CN210933825U CN210933825U CN201921816778.4U CN201921816778U CN210933825U CN 210933825 U CN210933825 U CN 210933825U CN 201921816778 U CN201921816778 U CN 201921816778U CN 210933825 U CN210933825 U CN 210933825U
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Abstract
The utility model provides a multistage intensification and thermal cycle's negative pressure evaporation formula solution enrichment facility, include: 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 utility model provides a solution concentration device realizes high-efficient low-cost concentrated technology, but wide application in each field solution concentration processing.
Description
Technical Field
The utility model relates to a solution concentration technical field especially relates to a multistage intensification and thermal cycle's negative pressure evaporation formula solution enrichment facility.
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.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem provide a multistage intensification and thermal cycle's negative pressure evaporation formula solution enrichment facility to solution concentration can't cyclic utilization heat energy, inefficiency and with high costs technical problem among the solution prior art of solution.
In order to solve the technical problem, the utility model provides a pair of multistage intensification and thermal cycle's negative pressure evaporation formula solution enrichment facility includes:
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 technical problem, the utility model also provides a multistage intensification and thermal cycle's negative pressure evaporation formula solution enrichment facility, include:
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 negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal circulation, 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 utility model provides a negative pressure evaporation formula solution enrichment facility passes through the heat circulation of refrigerant, heat-rising liquid, and concentrated solution is treated in 2 times heating at least, improves concentrated efficiency, has reduced the cost of concentrated heating to realize the heat energy cyclic utilization of 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 utility model provides a solution concentration device realizes high-efficient low-cost concentrated technology, but wide application in sea water desalination, food medicine, sewage treatment, petrochemical and central air conditioning heat source tower antifreeze solution concentrated treatment.
Drawings
Fig. 1 is a schematic design diagram of a first embodiment of a multi-stage temperature rise and thermal cycle negative pressure evaporation type solution concentration device provided by the present invention;
fig. 2 is a schematic design diagram of a second embodiment of the negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal cycle provided by the present invention;
fig. 3 is a schematic design diagram of a third embodiment of the negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal cycle provided by the present invention;
fig. 4 is a schematic design diagram of a fourth embodiment of the negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal cycle provided by the present invention;
fig. 5 is a schematic design diagram of a fifth embodiment of the negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal cycle provided by the present 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 objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, 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 motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
The utility model provides a multistage intensification and thermal cycle's negative pressure evaporation formula solution enrichment facility.
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 negative pressure evaporation type solution concentration device with multi-stage temperature rise and thermal circulation provided by the utility model, 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 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 utility model provides a negative pressure evaporation formula solution enrichment facility passes through the heat circulation of refrigerant, heat-rising liquid, and concentrated solution is treated in 2 times heating at least, improves concentrated efficiency, has reduced the cost of concentrated heating to realize the heat energy cyclic utilization of 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 multi-stage heating and thermal cycle negative pressure evaporation type solution concentration device provided by the first embodiment of the present invention, the second embodiment of the present invention provides another multi-stage heating and thermal cycle negative pressure evaporation type solution concentration device, which is different 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 cycle 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 cycle negative pressure evaporation type solution concentration device, which is different in that the heating liquid circulation 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, a fourth embodiment of the present invention provides another negative pressure evaporation type solution concentration device with multi-stage heating and thermal cycle based on the negative pressure evaporation type solution concentration device with multi-stage heating and thermal cycle provided by the third embodiment of the present invention, 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, unlike the multi-stage heating and thermal cycling negative pressure evaporation type solution concentration device provided in the first to fourth embodiments, the fifth embodiment of the present invention provides another multi-stage heating and thermal cycling negative pressure evaporation type solution concentration device.
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 utility model discloses a high efficiency and energy saving, can make heat energy obtain cyclic utilization, as long as give the circulating water heating earlier about 45 ℃ and carry out heat energy storage and heat preservation, during operation heat energy just can cyclic utilization repeatedly, need not give the circulating water heating again, because the circulating water heat gets back to the circulating water again through the produced steam latent heat of concentrated process after shifting away through the heat pump again, initial heat just shifts back again after shifting away like this, it shifts away again to retrieve back, through evaporation and condensation, absorb latent heat and release latent heat and reach the purpose that high-efficient concentrated solution was reached by concentrated solution two-stage intensification mode.
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 utility model discloses a consider that steam pressure crosses its specific capacity volume big factor that is big excessively, consider the too high loss that can increase the material of temperature and the waste of the energy again simultaneously, under both factor trade-offs, take the more moderate scheme of compromising: 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 utility model patent and utility model patent applied before, and the related concentrated utility model patent (negative pressure low temperature heat pump type concentrating device, patent No. 201910781092.4, also utility model patent: 201921374643.7) applied earlier does not comprehensively consider the relation between the specific volume of steam and the concentration efficiency, and only once heats up the concentrated solution, and can't reduce the specific volume of steam, and also can consume too much the power consumption of the compressor 10. And the utility model discloses a but give the further improvement on the efficiency, at first give by concentrated solution to obtain first intensification through heat exchanger steam latent heat feedback partly, then shift the circulating water latent heat to higher temperature department through the heat pump again, heat up condenser 3 through the secondary and give by concentrated solution second intensification. Although the related utility model patent in the previous stage also utilizes the water ring vacuum pump 1 to generate vacuum and plays the roles of mass transfer and heat transfer, the latent heat of the water vapor is fed back by the heat pump, but the fed back heat is difficult to meet the higher temperature requirement, 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 by the utility model is very large. The utility model discloses a but not so, it utilizes 1 mass transfer heat transfer in-process of water ring vacuum pump to make circulating water temperature obtain promoting, and by concentrated solution but by the reduced temperature, and utilize the difference rethread heat exchanger of the temperature between these two fluids to give preparation concentrated solution to some circulating water heat exchange, and another part circulating water passes through the heat pump and shifts its heat to higher department to be swaped for being prepared into the concentrated solution in negative pressure evaporation chamber, just so can make by concentrated solution reach more economical specific volume temperature state than ideal through two-stage promotion temperature, and the heat pump set power of configuration can reduce by a wide margin, this is the utility model discloses the purpose is located, also the difference is the relevant utility model patent that the person applied for in earlier stage most essential content is located.
The above is only the preferred embodiment of the present invention, not limiting the scope of the present invention, all of which are under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application in other related technical fields is included in the patent protection 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110624265A (en) * | 2019-10-28 | 2019-12-31 | 刘小江 | Multistage heating and thermal cycle negative pressure evaporation type solution concentration device |
| CN110624265B (en) * | 2019-10-28 | 2024-06-07 | 黄国和 | Multistage heating and thermal cycle negative pressure evaporation type solution concentration device |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110624265A (en) * | 2019-10-28 | 2019-12-31 | 刘小江 | Multistage heating and thermal cycle negative pressure evaporation type solution concentration device |
| CN110624265B (en) * | 2019-10-28 | 2024-06-07 | 黄国和 | Multistage heating and thermal cycle negative pressure evaporation type solution concentration device |
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