CN115814442A - Low-temperature heat pump evaporator and working method thereof - Google Patents
Low-temperature heat pump evaporator and working method thereof Download PDFInfo
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- CN115814442A CN115814442A CN202211504009.7A CN202211504009A CN115814442A CN 115814442 A CN115814442 A CN 115814442A CN 202211504009 A CN202211504009 A CN 202211504009A CN 115814442 A CN115814442 A CN 115814442A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000001704 evaporation Methods 0.000 claims abstract description 116
- 230000008020 evaporation Effects 0.000 claims abstract description 106
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 47
- 239000011550 stock solution Substances 0.000 claims abstract description 46
- 239000007921 spray Substances 0.000 claims abstract description 18
- 239000000243 solution Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 17
- 239000002351 wastewater Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 239000010842 industrial wastewater Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 101100298225 Caenorhabditis elegans pot-2 gene Proteins 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Abstract
The invention relates to a low-temperature heat pump evaporator which comprises an evaporation tank, wherein an evaporation cavity and a flow stabilizing cavity are formed in the evaporation tank, and a plurality of spray heads are arranged on the periphery of the evaporation cavity; an inlet and an outlet of the outer heat exchange cavity form an outer heat exchange pipeline with the flow stabilizing cavity and the evaporation cavity respectively, and an inlet and an outlet of the inner heat exchange cavity form an inner heat exchange pipeline with the flow stabilizing cavity and the evaporation cavity respectively; the circulating fan is arranged on the inner heat exchange pipeline, and the steam compressor is arranged on the outer heat exchange pipeline. The working method of the low-temperature heat pump evaporator comprises the following steps: the temperature in the evaporation cavity rises to a preset value; evaporation operation: the stock solution is sprayed into the evaporation cavity through the spray head, the stock solution is evaporated and concentrated in the evaporation cavity, the water in the stock solution is discharged through condensed water, and the impurity concentrated solution is gradually accumulated at the bottom of the tank. The stock solution can be fully contacted with the hot air in the evaporation cavity, the heat exchange area is large, heat exchange is not needed to be carried out by means of a heat exchange tube in the past, and the heat exchange efficiency is higher at present.
Description
Technical Field
The invention relates to the field of environment-friendly equipment, in particular to a low-temperature heat pump evaporator and a working method thereof.
Background
The working principle of a cryogenic evaporator is that the boiling point of the material decreases with decreasing pressure. The evaporation chamber is pumped into a vacuum state by a vacuum pump, the vacuum degree is about-95% to-97%, the boiling point of water under the pressure is 35-40 ℃, the solution continuously and circularly atomizes the material onto a heat exchanger through a forced circulation pump, and the water in the material is evaporated; the main power part compressor of the evaporator is acted on the refrigerant, evaporation and cooling are simultaneously realized at different heat exchange positions through pressure control on the refrigerant, waste heat is recycled along with the refrigerant, low-temperature evaporation is close to ambient temperature, large-temperature-difference heat exchange does not exist, heat loss is reduced to the minimum, and the purpose of energy conservation is achieved.
As shown in fig. 1, a schematic diagram of a conventional MVR evaporator includes a plate heat exchanger 11, a steam-water heat exchanger 12, an evaporator 13 and a steam compressor 14, and the connection relationship of the devices is as shown in fig. 1, during operation, a raw liquid (wastewater) is preheated by the plate heat exchanger 11 to reach a desired temperature, the preheated raw liquid enters the steam-water heat exchanger 12 for primary evaporation, condensed water obtained by the primary evaporation of the raw liquid flows out through the plate heat exchanger 11, a primary concentrated solution and a primary steam obtained by evaporation of the raw liquid enter a gas-liquid separator (not shown in the figure) for gas-liquid separation, wherein the primary steam enters the steam compressor 14, the primary concentrated solution enters the evaporator 13 for secondary evaporation, secondary steam generated by the secondary evaporation is pumped by the steam compressor 14, and the residual secondary concentrated solution obtained by evaporation in the evaporator is discharged from the bottom of the evaporator 13.
The problems of the industrial wastewater evaporation water treatment by adopting the MVR evaporator are as follows: the stock solution contains dissolved suspended matters which are easy to scale, such as liquid oil with high viscosity, calcium and magnesium ions and the like after evaporation, and the dissolved suspended matters are attached to the wall of a heat exchange pipe in the steam-water heat exchanger, so that the maintenance period of the heat exchanger and the use efficiency of equipment are greatly reduced; in addition, the original liquid exchanges heat in a form of liquid water in the steam-water heat exchanger, and the heat exchange efficiency is low.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the low-temperature heat pump evaporator and the working method thereof are provided, and the problems that the pipe wall of a heat exchanger is easy to scale in the industrial wastewater treatment process of the conventional evaporator, the maintenance period of the heat exchanger is greatly shortened, and the service efficiency of equipment is greatly reduced are solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect:
there is provided a low temperature heat pump evaporator comprising
The evaporation tank is internally provided with an evaporation cavity and a flow stabilizing cavity, the bottom of the evaporation cavity is communicated with the bottom of the flow stabilizing cavity, a plurality of spray heads are arranged around the evaporation cavity, each spray head is connected with a stock solution pipe, and the stock solution pipe is connected with a stock solution storage tank;
the heat exchanger comprises an inner heat exchange cavity and an outer heat exchange cavity, an outer heat exchange pipeline is formed between an inlet and an outlet of the outer heat exchange cavity and the flow stabilizing cavity and between the inlet and the outlet of the outer heat exchange cavity and the evaporation cavity respectively, and an inner heat exchange pipeline is formed between the inlet and the outlet of the inner heat exchange cavity and the flow stabilizing cavity and between the inlet and the outlet of the inner heat exchange cavity and the evaporation cavity respectively;
the circulating fan is arranged in the inner heat exchange pipeline and used for conveying the first-order steam in the steady flow cavity to the inner heat exchange cavity for heat exchange and temperature rise and then reflowing to the evaporation cavity;
the steam compressor is arranged on the external heat exchange pipeline and used for extracting first-order steam in the steady flow cavity, the air pressure in the evaporation tank is smaller than a standard atmospheric pressure, the first-order steam is compressed and heated to form second-order steam, the second-order steam exchanges heat with the first-order steam in the internal heat exchange cavity in the external heat exchange cavity, the second-order steam forms third-order steam after condensed water is removed, and the third-order steam enters the evaporation cavity to evaporate stock solution after reaching preset air pressure through the pressure stabilizing valve.
Further, the outer heat exchange pipeline comprises a first outer heat exchange pipe and a second outer heat exchange pipe;
the two ends of the first outer heat exchange pipe are respectively connected with the inlet of the flow stabilizing cavity and the inlet of the outer heat exchange cavity, and the vapor compressor is arranged on the first outer heat exchange pipe;
and two ends of the second outer heat exchange tube are respectively connected with outlets of the evaporation cavity and the outer heat exchange cavity, and a pressure stabilizing valve is arranged on the second outer heat exchange tube.
Further, the second outer heat exchange tube is connected with the stock solution tube, so that the third-order steam and the stock solution are sprayed out from the spray head together.
Further, the outer heat exchange pipeline comprises a first inner heat exchange pipe and a second inner heat exchange pipe;
the two ends of the first inner heat exchange tube are respectively connected with the flow stabilizing cavity and the inlet of the inner heat exchange cavity, and the circulating fan is arranged on the first inner heat exchange tube;
and two ends of the second inner heat exchange tube are respectively connected with the outlet of the evaporation cavity and the outlet of the inner heat exchange cavity.
Furthermore, the evaporating pot comprises a pot body, a flow stabilizing cylinder is arranged in the pot body, the upper end of the flow stabilizing cylinder is fixedly connected with the top wall in the pot body, an evaporating cavity is formed between the outer wall of the flow stabilizing cylinder and the inner wall of the pot body, and a flow stabilizing cavity is formed in the flow stabilizing cylinder.
In a second aspect:
providing a working method of the low-temperature heat pump evaporator, which comprises
Preheating equipment:
the vapor compressor drives airflow in the external heat exchange pipeline to circularly flow, the temperature of the compressed air rises after the compressed air is compressed by the vapor compressor, the air flows into the evaporation cavity to raise the temperature of the evaporation cavity, and the airflow is repeatedly compressed by the vapor compressor and raised in temperature until the temperature in the evaporation cavity rises to a preset value;
evaporation operation:
spraying the stock solution into an evaporation cavity through a spray head, and evaporating water in the stock solution into first-order water vapor;
the first-order water vapor generated by evaporation in the evaporation cavity enters the flow stabilizing cavity, one path of the first-order water vapor enters the external heat exchange pipeline, the first-order water vapor is pressurized and heated by the vapor compressor and then becomes second-order water vapor, and the pressure and the temperature of the second-order water vapor are both greater than those of the first-order water vapor;
the other path of the first-order steam enters the inner heat exchange cavity, the second-order steam exchanges heat with the first-order steam in the inner heat exchange cavity in the outer heat exchange cavity to become third-order steam, the temperature of the third-order steam is lower than that of the second-order steam but higher than that of the first-order steam, condensed water is discharged from the outer heat exchange cavity, the third-order steam forms unsaturated steam, and the third-order steam enters the evaporation cavity to evaporate the stock solution;
the stock solution is evaporated and concentrated in the evaporation cavity, the water in the stock solution is discharged through condensed water, and the impurity concentrated solution is gradually accumulated at the bottom of the tank.
The invention has the beneficial effects that:
the stoste sprays in the evaporation intracavity through the shower nozzle atomizing, makes stoste can fully contact with the hot-air of evaporation intracavity, and heat transfer area is big, no longer like in the past need carry out the heat transfer with the help of the heat exchange tube, and heat exchange efficiency is higher now. If the radius of the liquid drop is 0.1mm, the contact area of each kilogram of the stock solution and the hot air reaches 30 square meters; if the radius is 0.01mm, the contact area can reach 300 square meters. Therefore, when the atomized stock solution contacts with hot air, the atomized stock solution can be instantly gasified as long as certain conditions are met.
Because there is not the heat exchange tube, consequently, do not also have the problem of scale deposit on the heat exchange tube, the processing of evaporating pot is simpler, and the cost is lower.
The evaporation tank is operated under negative pressure, so that the working temperature of the whole system is reduced, and the energy loss caused by self heat dissipation of the whole system is reduced.
The whole equipment only has the vapor compressor and the circulating fan to operate, the energy consumption utilization rate is quite high, and the theoretical energy consumption is 50 degrees per ton of water.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a conventional MVR evaporator;
FIG. 2 is a diagram of a cryogenic heat pump evaporator system of the present invention;
FIG. 3 is a diagram of an external heat exchange circuit in a low temperature heat pump evaporator;
FIG. 4 is a diagram of an internal heat exchange circuit in a low temperature heat pump evaporator;
wherein,
11. a plate heat exchanger 12, a steam-water heat exchanger 13, an evaporation tank 14 and a steam compressor;
2. the evaporator comprises an evaporation tank 21, an evaporation cavity 22, a flow stabilizing cavity 24 and a flow stabilizing cylinder;
3. a vapor compressor;
4. a heat exchanger;
5. a circulating fan;
61. a first outer heat exchange tube 62 and a second outer heat exchange tube;
71. a first inner heat exchange tube, 72, a second inner heat exchange tube;
81. raw liquid pipe 82, spray head 83 and raw liquid pump.
Detailed Description
The invention will now be further described with reference to specific examples. The drawings are simplified schematic diagrams each illustrating the basic structure of the present invention only in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 2 to 4, a low temperature heat pump evaporator includes
The device comprises an evaporation tank 2, wherein an evaporation cavity 21 and a flow stabilizing cavity 22 are formed in the evaporation tank 2, the bottom of the evaporation cavity 21 is communicated with the bottom of the flow stabilizing cavity 22, a plurality of spray heads are arranged around the evaporation cavity 21, each spray head is connected with a stock solution pipe, and the stock solution pipe is connected with a stock solution storage tank;
the heat exchanger 4 comprises an inner heat exchange cavity and an outer heat exchange cavity, an outer heat exchange pipeline is formed between an inlet and an outlet of the outer heat exchange cavity and the steady flow cavity 22 and between an inlet and an outlet of the outer heat exchange cavity and the evaporation cavity 21 respectively, and an inner heat exchange pipeline is formed between an inlet and an outlet of the inner heat exchange cavity and the steady flow cavity 22 and between an inlet and an outlet of the inner heat exchange cavity and the evaporation cavity 21 respectively;
the circulating fan 5 is arranged in the inner heat exchange pipeline, and the circulating fan 5 conveys the first-order steam in the flow stabilizing cavity 22 to the inner heat exchange cavity for heat exchange and temperature rise and then flows back to the evaporation cavity 21;
the steam compressor 3 is arranged on the external heat exchange pipeline, the steam compressor 3 extracts first-order steam in the steady flow cavity 22, the air pressure in the evaporating pot 2 is smaller than a standard atmospheric pressure, the first-order steam is compressed and heated to form second-order steam, the second-order steam exchanges heat with the first-order steam in the internal heat exchange cavity in the external heat exchange cavity, the second-order steam forms third-order steam after condensed water is removed, and the third-order steam enters the evaporating cavity 21 to evaporate stock solution after reaching a preset air pressure through the pressure stabilizing valve.
In this embodiment, heat exchanger 4 is current ripe product, adopts plate heat exchanger 4 in this embodiment.
In this embodiment, the raw liquid pipe is provided with a raw liquid pump, and the raw liquid of sewage is atomized and sprayed into the evaporation cavity 21 from each spray head through the raw liquid pump.
In this embodiment, a condensed water discharging pipe is provided on the outer heat exchange cavity, and a drain valve is provided on the condensed water discharging pipe and used for ensuring smooth discharge of condensed water.
The first-order steam formed after the stock solution is evaporated in the evaporation cavity 21 has the pressure lower than a standard atmospheric pressure and the temperature lower than 100 ℃; the pressure and the temperature of the second-order steam compressed by the steam compressor 3 are increased, and the temperature is higher than 100 ℃;
the pressure of the second-order steam is the same as that of the third-order steam after the second-order steam passes through the heat exchanger 4 for heat exchange, but the temperature is reduced after the heat exchange, the heat of the second-order steam in the outer heat exchange pipeline is absorbed by the first-order steam in the inner heat exchange pipeline, and the third-order steam and the first-order steam in the inner heat exchange pipeline both enter the evaporation cavity 21 to provide heat for the evaporation of the stock solution.
Specifically, as an optional implementation manner in this embodiment, as shown in fig. 3, the external heat exchange pipeline includes a first external heat exchange pipe and a second external heat exchange pipe;
two ends of the first outer heat exchange pipe are respectively connected with the flow stabilizing cavity 22 and an inlet of the outer heat exchange cavity, and the vapor compressor 3 is arranged on the first outer heat exchange pipe;
two ends of the second outer heat exchange tube are respectively connected with the evaporation cavity 21 and the outlet of the outer heat exchange cavity, and a pressure stabilizing valve is arranged on the second outer heat exchange tube.
In this embodiment, the surge damping valve is the existing mature product, and the third-order steam output from the heat exchanger 4 can only evaporate in the cavity 21 when reaching the preset pressure value of the surge damping valve.
Preferably, the second outer heat exchange tube is connected with the stock solution tube, so that the third-order steam and the stock solution are sprayed out from the spray head together.
Three-order steam is simultaneously from the shower nozzle blowout with stoste, and stoste is heated more evenly when spouting, and evaporation that can be higher is first-order steam.
Specifically, as an optional implementation manner in this embodiment, as shown in fig. 4, the outer heat exchange pipeline includes a first inner heat exchange pipe and a second inner heat exchange pipe;
the two ends of the first inner heat exchange tube are respectively connected with the flow stabilizing cavity 22 and the inlet of the inner heat exchange cavity, and the circulating fan 5 is arranged on the first inner heat exchange tube;
and two ends of the second inner heat exchange tube are respectively connected with the evaporation cavity 21 and the outlet of the inner heat exchange cavity.
Specifically, as an optional implementation manner in this embodiment, as shown in fig. 2, the evaporation tank 2 includes a tank body, a flow stabilizing cylinder 24 is arranged in the tank body, an upper end of the flow stabilizing cylinder 24 is fixedly connected with a top wall in the tank body, an evaporation cavity 21 is formed between an outer wall of the flow stabilizing cylinder 24 and an inner wall of the tank body, and a flow stabilizing cavity 22 is formed in the flow stabilizing cylinder 24.
In this embodiment, the flow stabilizing cylinder 24 is arranged at the middle position, and the evaporation cavity 21 is an annular cavity.
The working method of the low-temperature heat pump evaporator comprises
Preheating equipment:
the vapor compressor 3 drives the airflow in the external heat exchange pipeline to circularly flow, the temperature of the compressed air rises through the vapor compressor 3, the air flows into the evaporation cavity 21 to raise the temperature of the evaporation cavity 21, and the airflow is repeatedly compressed and raised through the vapor compressor 3 until the temperature in the evaporation cavity 21 rises to a preset value;
evaporation operation:
spraying the stock solution into the evaporation cavity 21 through a spray head, and evaporating water in the stock solution into first-order water vapor;
the first-order vapor generated by evaporation in the evaporation cavity 21 enters the flow stabilizing cavity 22, one path of the first-order vapor enters the external heat exchange pipeline, the first-order vapor is pressurized and heated by the vapor compressor and then becomes second-order vapor, and the pressure and the temperature of the second-order vapor are both greater than those of the first-order vapor;
the other path of the first-order steam enters the inner heat exchange cavity, the second-order steam exchanges heat with the first-order steam in the inner heat exchange cavity in the outer heat exchange cavity to become third-order steam, the temperature of the third-order steam is lower than that of the second-order steam but higher than that of the first-order steam, condensed water is discharged from the outer heat exchange cavity, the third-order steam forms unsaturated steam, and the third-order steam enters the evaporation cavity 21 to evaporate the stock solution;
the stock solution is evaporated and concentrated in the evaporation cavity 21, the water in the stock solution is discharged through condensed water, and the impurity concentrated solution is gradually accumulated at the bottom of the tank.
The following is an example of a method for treating an industrial wastewater (i.e., a stock solution) having an SS (solid content) of 80mg/L;
the equipment is preheated to: the steam compressor 3 circulates and circulates the air current in the external heat exchange pipeline to make the temperature in the evaporation cavity 21 reach about 90-95 ℃, and then the waste water evaporation is started;
waste water evaporation:
the temperature in the evaporation cavity 21 is 90-95 ℃, and the pressure is 0.05MPa;
the temperature in the steady flow cavity 22 is 80-85 ℃, and the pressure is 0.05MPa, which is the parameter of the first-order steam;
after the first-order steam passes through a steam compressor 3, the temperature is 120-130 ℃, and the pressure is 0.2MPa, namely a second-order steam parameter;
the second-order steam enters an outer heat exchange cavity of the heat exchanger 4 to exchange heat with the first-order steam in the inner heat exchange cavity, the second-order steam is cooled to form condensate water, the condensate water is discharged from the outer heat exchange cavity, the condensate water is changed into third-order steam after the second-order steam exchanges heat, the temperature of the third-order steam is 100-110 ℃, the pressure is 0.2MPa, the third-order steam enters a stock solution pipe and is sprayed into an evaporation cavity 21 together with the stock solution wastewater from a spray head, and the wastewater is evaporated.
The working process of the external heat exchange pipeline is carried out, the external heat exchange pipeline continuously and circularly works, water in the wastewater can be discharged in a condensate water mode, and the impurity concentrated solution in the wastewater falls into the bottom of the evaporation tank 2, so that the wastewater is treated.
The inner heat exchange pipeline circularly works: the circulating fan 5 operates to input the first-order steam into the inner heat exchange cavity, at the moment, the first-order steam in the inner ring cavity is at a low temperature relative to the second-order steam in the outer heat exchange cavity, so that the second-order steam can be condensed and liquefied, the heat of the second-order steam is absorbed after the first-order steam of the inner heat exchange pipeline exchanges heat, the temperature of the first-order steam output from the inner heat exchange cavity is 90-95 ℃, the first-order steam after heat exchange flows back into the evaporation cavity 21, the evaporation temperature in the evaporation cavity 21 is ensured, and the raw liquid wastewater can be stably evaporated.
Through the low-temperature heat pump evaporator, the waste water can be evaporated in the evaporation cavity 21 in an atomization mode, water vapor and impurity concentrated solution are separated from the waste water, the water vapor circulates through the external heat exchange pipeline to form condensed water and then is discharged outwards, and the impurity concentrated solution is gathered at the bottom of the evaporation tank 2, so that the treatment of the waste water is realized.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. A low-temperature heat pump evaporator is characterized by comprising
The evaporation tank is internally provided with an evaporation cavity and a flow stabilizing cavity, the bottom of the evaporation cavity is communicated with the bottom of the flow stabilizing cavity, a plurality of spray heads are arranged around the evaporation cavity, each spray head is connected with a stock solution pipe, and the stock solution pipe is connected with a stock solution storage tank;
the heat exchanger comprises an inner heat exchange cavity and an outer heat exchange cavity, an outer heat exchange pipeline is formed between an inlet and an outlet of the outer heat exchange cavity and the flow stabilizing cavity and between the inlet and the outlet of the outer heat exchange cavity and the evaporation cavity respectively, and an inner heat exchange pipeline is formed between the inlet and the outlet of the inner heat exchange cavity and the flow stabilizing cavity and between the inlet and the outlet of the inner heat exchange cavity and the evaporation cavity respectively;
the circulating fan is arranged in the inner heat exchange pipeline and used for conveying the first-order steam in the steady flow cavity to the inner heat exchange cavity for heat exchange and temperature rise and then reflowing to the evaporation cavity;
the steam compressor is arranged on the outer heat exchange pipeline and used for extracting first-order steam in the steady flow cavity, the air pressure in the evaporation tank is smaller than a standard atmospheric pressure, the first-order steam is compressed and heated to form second-order steam, the second-order steam exchanges heat with the first-order steam in the inner heat exchange cavity in the outer heat exchange cavity, the second-order steam forms third-order steam after condensate water is removed, and the third-order steam enters the evaporation cavity to evaporate stock solution after reaching a preset air pressure through the pressure stabilizing valve.
2. The evaporator of a cryogenic heat pump of claim 1,
the outer heat exchange pipeline comprises a first outer heat exchange pipe and a second outer heat exchange pipe;
the two ends of the first outer heat exchange pipe are respectively connected with the inlet of the flow stabilizing cavity and the inlet of the outer heat exchange cavity, and the vapor compressor is arranged on the first outer heat exchange pipe;
and two ends of the second outer heat exchange tube are respectively connected with outlets of the evaporation cavity and the outer heat exchange cavity, and a pressure stabilizing valve is arranged on the second outer heat exchange tube.
3. The evaporator of claim 2, wherein,
the second outer heat exchange tube is connected with the stock solution tube, so that the third-order steam and the stock solution are sprayed out from the spray head together.
4. The evaporator of a cryogenic heat pump of claim 1,
the outer heat exchange pipeline comprises a first inner heat exchange pipe and a second inner heat exchange pipe;
the two ends of the first inner heat exchange tube are respectively connected with the flow stabilizing cavity and the inlet of the inner heat exchange cavity, and the circulating fan is arranged on the first inner heat exchange tube;
and two ends of the second inner heat exchange tube are respectively connected with the outlet of the evaporation cavity and the outlet of the inner heat exchange cavity.
5. The evaporator of a cryogenic heat pump of claim 1,
the evaporating pot comprises a pot body, a flow stabilizing cylinder is arranged in the pot body, the upper end of the flow stabilizing cylinder is fixedly connected with the top wall in the pot body, an evaporating cavity is formed between the outer wall of the flow stabilizing cylinder and the inner wall of the pot body, and a flow stabilizing cavity is formed in the flow stabilizing cylinder.
6. A method of operating a cryogenic heat pump evaporator according to any one of claims 1 to 5 comprising
Preheating equipment:
the vapor compressor drives airflow in the external heat exchange pipeline to circularly flow, the temperature of the compressed air rises after the compressed air is compressed by the vapor compressor, the compressed air flows into the evaporation cavity to raise the temperature of the evaporation cavity, and the compressed air is repeatedly compressed by the vapor compressor to raise the temperature until the temperature in the evaporation cavity rises to a preset value;
evaporation operation:
spraying the stock solution into an evaporation cavity through a spray head, and evaporating water in the stock solution into first-order water vapor;
the first-order water vapor generated by evaporation in the evaporation cavity enters the flow stabilizing cavity, one path of the first-order water vapor enters the external heat exchange pipeline, the first-order water vapor is pressurized and heated by the vapor compressor and then becomes second-order water vapor, and the pressure and the temperature of the second-order water vapor are both greater than those of the first-order water vapor;
the other path of the first-order steam enters the inner heat exchange cavity, the second-order steam exchanges heat with the first-order steam in the inner heat exchange cavity in the outer heat exchange cavity to become third-order steam, the temperature of the third-order steam is lower than that of the second-order steam but higher than that of the first-order steam, condensed water is discharged from the outer heat exchange cavity, the third-order steam forms unsaturated steam, and the third-order steam enters the evaporation cavity to evaporate the stock solution;
the stock solution is evaporated and concentrated in the evaporation cavity, the water in the stock solution is discharged through condensed water, and the impurity concentrated solution is gradually accumulated at the bottom of the tank.
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| CN213537324U (en) * | 2020-09-06 | 2021-06-25 | 清大中能(天津)环保科技有限公司 | Steam-carrying type MVR evaporation concentration device |
| CN214990393U (en) * | 2021-02-07 | 2021-12-03 | 南京通用电气装备有限公司 | Long-path ventilation cavity of evaporation tower |
| CN113457185A (en) * | 2021-07-06 | 2021-10-01 | 江苏博科华环保科技有限公司 | MVR evaporator capable of adjusting evaporation temperature according to different mother liquor temperature requirements and using method thereof |
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Application publication date: 20230321 |