CN115920439A - Integrated multi-effect condensation low-temperature evaporation concentration system - Google Patents
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Abstract
The invention belongs to the field of energy environmental protection, and particularly relates to an integrated multi-effect condensation low-temperature evaporation concentration system. The system integrates material heating evaporation and steam condensation in a container tank, adopts a three-level steam condensation scheme, has good heat transfer effect of a heat exchange part, high steam condensation efficiency, low operation energy consumption, low maintenance cost and long service life, and effectively utilizes different grades of energy sources such as solar energy, natural cold source and the like to improve the energy efficiency of the system. The system can efficiently condense secondary steam to maintain vacuum degree, and can also improve the heat exchange environment at the evaporator side during initial start. Compared with the prior art, the system can achieve the purposes of energy conservation, emission reduction and carbon reduction.
Description
Technical Field
The invention belongs to the field of energy environmental protection, and particularly relates to an integrated multi-effect condensation low-temperature evaporation concentration system.
Background
Evaporative concentration is a common process in the industry that produces high concentrations of solutes by enhancing the evaporation of water from a solution. The method commonly used at present is to heat the solution to the boiling temperature of the solvent water, and the solvent water is changed into steam to escape through boiling. Under the condition that no high-quality waste heat source exists or the material is sensitive to high temperature, the adoption of the reverse Carnot cycle heat pump vacuum low-temperature evaporation concentration system is a current high-efficiency treatment mode, the material evaporation operation temperature is low, the primary energy utilization rate is high, and the method becomes an important technical measure for energy conservation and carbon reduction in the evaporation concentration process.
The prior art still has some problems, so that the advantages of the vacuum low-temperature evaporation and concentration technology of the heat pump are not exerted, and the advantages are mainly reflected in the following aspects:
(1) The integration level of the heat pump vacuum low-temperature evaporation concentration system is low, the occupied area is large, and the total volume needing vacuumizing is also large.
(2) Because the heat-releasing side of the heat pump cycle has more heat generated by the compressor than the heat-absorbing side, in order to keep the cold-heat balance of the heat pump cycle, the existing method is to arrange an air cooling heat-dissipating device in front of the expansion valve to discharge the heat, and the heat is not utilized to be heat loss, thereby reducing the energy efficiency of the system.
(3) The boiling of material needs to maintain certain vacuum, and the maintenance of vacuum needs the high-efficient condensation of secondary steam and evacuation system to realize jointly, and current system can't carry out high-efficient condensation to the secondary steam of quick output, has not only reduced the condensation heat recovery effect of heat pump evaporator side, has still increased evacuation system's the burden of bleeding, has increased the energy consumption.
(4) In the process of initially starting up materials and heating, because of non-boiling evaporation, a heat exchange part is not contacted with steam, so that the working condition of a refrigeration cycle is worsened.
(5) The problem of gradient utilization according to heat energy grade is not considered in the prior art, because the steam temperature is high, the temperature gradient between the steam condensation temperature and the refrigerant evaporation temperature is large, gradient condensation cannot be realized by a single refrigerant cooling mode, and the energy efficiency of a system is reduced.
(6) The existing heat pump vacuum low-temperature evaporation concentration technology does not fully consider the adoption of a high-efficiency secondary steam condensation heat exchange mode, so that the condensation heat needs to be recovered by depending on lower evaporation temperature, and the energy efficiency of a heat pump circulating system is low.
Disclosure of Invention
The invention aims to solve the problems and the defects in the prior art, and provides an integrated multi-effect condensation low-temperature evaporation concentration system.
The utility model provides an integrated multi-effect condensation low-temperature evaporation concentration system, including condensation low-temperature evaporation concentration jar, heat pump circulating compressor, elementary heat exchanger, evaporation cooling equipment, wherein,
a heating coil, a stirring sheet, a defoaming device, a primary condensing coil, an atomizing nozzle, an evaporator coil, a separating cylinder plate and a diffusing fin are arranged in the condensation low-temperature evaporation concentration tank;
the bottom plate of the separating cylinder plate and the inner wall of the condensation low-temperature evaporation concentration tank are welded into a whole to form a hollow annular cylindrical structure, and a cylinder of the separating cylinder plate is a steam flow channel;
the flow dispersing fins are arranged at the top of the cylinder of the separating cylinder plate;
the defoaming device is arranged between the liquid level of the material and the bottom plate of the separating cylinder plate;
the evaporator coil is arranged between the separating cylinder plate and the inner wall of the multi-effect condensation low-temperature evaporation concentration tank;
pumping a high-temperature and high-pressure refrigerant into the heating coil through a heat pump circulating compressor, heating the dilute material fed into the condensing low-temperature evaporation concentration tank under a vacuum condition, continuously stirring the dilute material by the stirring sheet in the heating process, purifying the generated secondary steam by the bubble eliminating device, and condensing the secondary steam after passing through the cylinder of the separating cylinder plate and the flow dispersing fins;
the primary condensing coil pipe performs cascade condensation heat exchange on secondary steam by using cooling water generated by the evaporative cooling equipment;
the cooled refrigerant is sent into the primary heat exchanger, circulates to the evaporator coil in the condensation low-temperature evaporation concentration tank for heat recovery, and then is sent to the heat pump circulating compressor, steam generated by heating of a dilute material is pre-cooled by the primary condensation coil to generate partial condensed water, and then atomized water sprayed by an atomization nozzle directly contacts with the condensation and absorption, is sprayed to the evaporator coil, and is stored at the bottom of the separating barrel plate after being cooled;
the condensation low-temperature evaporation and concentration tank is provided with a condensate pump, a water inlet pipe of the condensate pump is connected with the upper part of the bottom plate of the separation barrel plate, a water outlet pipe of the condensate pump is connected with the atomizing nozzle, and the atomizing nozzle atomizes condensate water into fine liquid drops which directly contact with condensation to absorb water vapor;
and cooling water generated by the evaporation cooling equipment is input into the primary condensing coil to pre-cool secondary steam evaporated by the multi-effect condensation low-temperature evaporation concentration tank.
The integrated multi-effect condensation low-temperature evaporation concentration system comprises a vacuumizing unit, wherein non-condensable gas treated by the multi-effect condensation low-temperature evaporation concentration tank is exhausted through vacuumizing.
The integrated multi-effect condensation low-temperature evaporation concentration system comprises a vacuum pumping circulating pump, a water tank and a vacuum ejector, wherein,
a perforated pipe is arranged in the water tank and is immersed in water;
the vacuumizing circulating pump pumps water in the water tank, and a part of non-condensable gas obtained by evaporating and condensing the dilute material is pumped by the vacuum ejector and then is discharged into the water tank through the porous pipe; and the other part is sent to the primary heat exchanger to exchange heat with the refrigerant.
According to the application, the integrated multi-effect condensation low-temperature evaporation concentration system is characterized in that a liquid blocking baffle is arranged at a suction inlet of a vacuum pumping pipeline of the vacuum ejector.
According to the application, the integrated multi-effect condensation low-temperature evaporation concentration system further comprises a circulating water temperature control device for controlling the temperature of water in the water tank.
According to the application, the integrated multi-effect condensation low-temperature evaporation concentration system is characterized in that a dilute feed liquid inlet pipe and a concentrated feed liquid outlet pipe are connected to the outside of the condensation low-temperature evaporation concentration tank.
According to the application, the integrated multi-effect condensation low-temperature evaporation concentration system is characterized in that a heat preservation layer is arranged on the outer wall of the integrated multi-effect condensation low-temperature evaporation concentration tank.
According to the application, the integrated multi-effect condensation low-temperature evaporation concentration system is characterized in that the condensate pump is connected with the water inlet pipe, the upper part of the bottom plate of the separation barrel plate is connected with the water outlet pipe, and the atomization spray head is connected with the water outlet pipe.
According to the concentrated system of integral type multiple effect condensation low temperature evaporation of this application, wherein, heating coil with the evaporator coil is the interior rib pipe of intraductal reinforcing heat transfer.
According to the application, concentrated system of integral type multiple-effect condensation low temperature evaporation, wherein, the system still includes solar energy material preheating unit, solar energy material preheating unit includes solar collector, thin stock solution preheating tank, preheating circulating pump, preheating tank temperature control device, wherein, solar collector provides the heat source, warp the hot water circulation heating in the preheating coil in the thin stock solution preheating tank reaches the settlement temperature, sends into in the concentrated jar of multiple-effect condensation low temperature evaporation, preheating tank temperature control device is used for control the temperature of intaking of preheating coil, preheating circulating pump is used for providing hot water circulation power.
The technical scheme of the application has the advantages that:
to above-mentioned prior art's problem, this application provides an improved generation heat pump vacuum low temperature evaporation concentration system, and this system is with material heating evaporation and steam condensation integration in a container to adopted tertiary steam condensation scheme, heat transfer component heat transfer effect is good, steam condensation is efficient, the operation energy consumption is low, maintenance cost is low, long service life, effectively utilize the energy efficiency of different grades such as solar energy, nature cold source simultaneously. The system can efficiently condense secondary steam to maintain vacuum degree, and can also improve the heat exchange environment at the evaporator side during initial start. Compared with the prior art, the system can achieve the purposes of energy conservation, emission reduction and carbon reduction.
1. The heating evaporation of the materials and the condensation of the secondary steam are integrated in one container, the steam flow is shortened, the space volume required for maintaining the vacuum degree is reduced, and the total occupied area of the system is reduced.
2. The heat produced by the work of the compressor is fully utilized to heat the material, and the heat for heating the material is increased on the premise of ensuring the cold and hot balance of the heat pump cycle.
3. The secondary steam is condensed through the primary condensing coil, the atomizing nozzle water spray and the evaporator coil respectively, the secondary steam generated by boiling of materials can be quickly and efficiently absorbed through three-level condensation, the disturbance of a large amount of steam output on the vacuum degree in a vacuum container is reduced, and the steam extraction load of a vacuum-pumping system is reduced.
4. The condensation water circulating spraying component is arranged, when the system is initially started, the evaporator coil can be circularly sprayed in a stage without heat of absorbable steam, and the normal operation of the heat pump circulation is realized.
5. The technical measures of gradient utilization according to the heat energy grade are considered, high-temperature steam is firstly condensed by high-temperature cooling water generated by evaporative cooling equipment, then is condensed by direct contact of condensate water spray, and finally is condensed by further heat absorption of a low-temperature evaporator coil, so that the heat transfer temperature gradient is reduced, and the energy efficiency level is improved.
6. The efficient absorption mode of condensed water spray direct contact condensation is adopted, and the absorption efficiency and the condensation heat exchange efficiency of steam are improved.
7. Adopt solar energy collection volume to preheat rare material, reduced the sensible heat intensification link of rare material in integral type multiple-effect condensation low temperature evaporation concentration jar, heat pump circulation system's heating coil directly carries out boiling evaporation heat transfer, has improved the heat transfer efficiency of material evaporation.
Drawings
FIG. 1 is a schematic diagram of the integrated multi-effect condensing low-temperature evaporation concentration system of the present invention;
reference numerals:
1: integral type multiple-effect condensation low temperature evaporation concentration jar, 11: stirring motor, 12: defoaming device, 13: stirring blade, 14: thin stock solution inlet pipe, 15: concentrated feed liquid outlet pipe, 16: partition cylinder plate, 161: partition cylinder plate bottom plate, 162: partition cylinder plate cylinder, 17: diffuser fin, 18: condensate pump, 19: condensate outlet pipe, 110: atomizer, 111: an insulating layer is arranged on the upper surface of the shell,
2: compressor, 21: heating coil, 22: expansion valve, 23: primary heat exchanger, 24: evaporator coil, 3: evaporative cooling apparatus, 31: cooling water pump, 32: cooling water temperature control device, 33: a primary condensing coil pipe is arranged on the shell,
4: evacuation circulation pump, 41: ejector, 42: liquid-blocking baffle, 43: perforated pipe, 44: water tank, 45: a temperature control device for circulating water is provided,
5: diluent preheating tank, 51: preheating coil, 52: preheating circulating pump, 53: solar collector, 54: preheating tank temperature control device, 55: preheating tank vent, 56: diluent pump, 57: and (5) preserving the heat of the preheating tank.
Detailed Description
The technical solutions of the present application are described in detail below with reference to specific embodiments.
The utility model provides an integral type multiple-effect condensation low temperature evaporation concentration system includes condensation low temperature evaporation concentration jar, heat pump circulating compressor, primary heat exchanger, evaporation cooling equipment, wherein, condensation low temperature evaporation concentration jar inside is equipped with heating coil, stirring piece, fire fighting equipment, primary condensation coil, atomizer, evaporator coil, separation tube sheet, the fin that looses.
And a stirring motor is arranged above the outside of the multi-effect condensation low-temperature evaporation concentration tank and used for driving the stirring sheet.
And a dilute feed liquid inlet pipe and a concentrated feed liquid outlet pipe are connected to the outside of the multi-effect condensation low-temperature evaporation concentration tank.
And a separating cylinder plate and a flow dispersing fin are arranged in the condensation low-temperature evaporation concentration tank to form a steam flowing and processing channel. The diffusion fin is arranged at the top of the separating cylinder plate cylinder and used for diffusing steam. The condensation low-temperature evaporation and concentration tank is provided with a condensate pump, an atomizing spray head and a condensate water outlet pipe and is used for direct contact condensation of steam and discharge of excess condensate water. The defoaming device is arranged between the material liquid level and the bottom plate of the separating cylinder plate. The condensate pump is connected with the upper part of the bottom plate of the separation barrel plate through a water inlet pipe, the water outlet pipe is connected with the atomizing nozzle, the atomizing nozzle atomizes the condensate water into fine liquid drops, and the fine liquid drops are directly contacted with the condensate water to absorb water vapor.
Heating coil, primary condensing coil, atomizer, evaporator coil all set up in the concentrated jar of integral type multiple-effect condensation low temperature evaporation, realize the space integration of heating evaporation and secondary steam condensation. The heating coil and the evaporator coil adopt inner ribbed pipes for enhancing heat exchange in the pipes.
And the outer wall of the condensation low-temperature evaporation concentration tank is provided with a heat insulation layer.
The heat pump circulation is realized through a heat pump compressor, a heating coil, an expansion valve, a primary heat exchanger and an evaporator coil, wherein the heat pump compressor provides power for the heat pump circulation, the heating coil is arranged in the condensation low-temperature evaporation concentration tank and used for heating materials, and the evaporator coil is arranged between the separating cylinder plate and the inner wall of the multi-effect condensation low-temperature evaporation concentration tank and used for cooling condensed water and further absorbing steam by falling film; the primary heat exchanger is used for cooling circulating water of the vacuumizing unit. And a high-temperature high-pressure refrigerant at the outlet of the heat pump compressor enters a heating coil in the integrated multi-effect condensation low-temperature evaporation concentration tank to heat materials, is throttled by an expansion valve and then is sent into the primary heat exchanger, and then returns to the compressor after further absorbing heat by an evaporator coil.
Condensation low temperature evaporation concentration jar is used for storing the thin material that carries out the boiling evaporation, sends into condensation low temperature evaporation concentration jar the thin material heats boiling evaporation that begins to the boiling under vacuum condition, and at the heating process, stirring motor rotary drive stirring piece constantly stirs the feed liquid, and the flash steam that produces purifies through the fire fighting equipment, condenses after through separating tube sheet drum and free flow fin.
Realize elementary condensation through evaporation cooling equipment, cooling water pump, cooling water temperature control device and elementary condensing coil, it is right condensation low temperature evaporation concentration tank evaporates the secondary steam that sends carries out elementary condensation, in order to guarantee heat pump cycle's cold and hot balance, the recirculated cooling water is prepared to evaporation cooling equipment, cooling water pump provides cooling water circulation power, cooling water temperature control device is used for controlling elementary condensing coil temperature of intaking when outdoor meteorological condition changes to control its heat dissipation capacity. The primary condensing coil is arranged at the front section of secondary steam condensation treatment, and the secondary steam is subjected to cascade condensation heat exchange by using cooling water produced by the evaporative cooling equipment.
The evaporative cooling equipment generates cooling water with the temperature lower than that of steam, the cooling water is sent into the primary condensing coil by the cooling water pump, and the heat dissipation capacity is adjusted by the cooling water temperature control device.
Steam after purifying in the condensation low temperature evaporation concentration jar is through the condensation heat dissipation of elementary condensing coil to guarantee heat balance, the surplus steam after the elementary condensation is absorbed through the liquid drop that sprays that the atomizer formed, then the warp evaporator coil further falls liquid film and absorbs and form low temperature condensate water after the cooling, store in separate tube sheet bottom plate department and be used for the circulation to spray, the surplus condensate water passes through condensate water outlet flow pipe discharges.
The vacuumizing circulating pump, the ejector, the liquid blocking baffle, the perforated pipe, the water tank and the circulating water temperature control device realize vacuumizing, and are used for forming negative pressure so as to suck excess steam and non-condensable gas in the integrated multi-effect condensation low-temperature evaporation concentration tank and ensure the vacuum environment in the condensation low-temperature evaporation concentration tank. And the vacuumizing circulating pump extracts circulating water, and the circulating water is sprayed by the ejector to extract excessive steam and non-condensable gas in the integrated multi-effect condensation low-temperature evaporation concentration tank after the condensation process. The liquid blocking baffle is arranged at a suction inlet of the vacuumizing pipe and used for preventing condensed water from being sucked, the porous pipe is arranged in the water tank and is immersed in the circulating water, the vacuumizing circulating pump simultaneously sends part of the circulating water into the primary heat exchanger for heat exchange, and the heat absorption capacity of a circulating system of the heating pump is increased while the water tank dissipates heat. The branch of the vacuum ejector is connected with a vacuum pumping pipeline, a water outlet pipe of the vacuum ejector is connected with the porous pipe, the bottom of the porous pipe is closed, and a plurality of jet circular holes are formed in the periphery of the porous pipe.
Still include solar energy material preheating unit, solar energy material preheating unit includes solar collector, thin stock solution preheating tank, preheats circulating pump, preheating tank temperature control device, thin stock solution pump, wherein, solar collector provides the heat source, warp hot water circulation heating in the preheating coil in the thin stock solution preheating tank reaches the settlement temperature, sends into in the concentrated jar of multiple-effect condensation low temperature evaporation, preheating tank temperature control device is used for control preheating coil's the temperature of intaking, preheating circulating pump is used for providing hot water circulation power. The solar material preheating unit preheats the dilute material to be concentrated by utilizing hot water produced by the solar heat collector so as to reduce the heating load of the heat pump circulating system.
The technical scheme of the application is described in the following with the accompanying drawings.
As shown in fig. 1, the dilute material is preheated before entering the condensing low-temperature evaporation concentration tank 1 to reach the boiling point temperature under the designed vacuum degree, and the dilute material is circulated and heated by hot water in a preheating coil 51 in a dilute liquid preheating tank 5 to reach the set temperature by using a heat source provided by a solar heat collector 53, and is sent into the condensing low-temperature evaporation concentration tank 1 through a dilute liquid pump 56. The preheating tank temperature control device 54 is used for controlling the temperature of the inlet water of the preheating coil 51 so as to prevent the temperature from being too high. The preheat circulation pump 52 is used to provide hot water circulation power.
The thin material that sends into condensation low temperature evaporation concentration jar 1, under vacuum condition, heats to the boiling point via heating coil 21 and begins the boiling evaporation, and in the heating process, agitator motor 11 rotary drive stirring piece 13 constantly stirs the feed liquid, reduces bonding and coking when reinforcing heat transfer and steam escape, and the steam that produces is purified back through fire fighting equipment 12, gets into the condensation link through the runner that separates barrel panel 16 and scattered flow fin 17 formation. The concentrated material meeting the treatment requirements is discharged through a concentrated material liquid outlet pipe 15.
The temperature of the generated steam is reduced after being pre-cooled by the primary condensing coil 33, partial condensed water is generated, then the atomized water sprayed by the atomizing spray head 110 directly contacts with the condensing and absorbing water, the atomized water is sprayed to the evaporator coil 24, the atomized water is stored at the bottom of the separating cylinder plate 16 after being cooled, and the condensed water pump 18 provides the circulating power of the condensed water. The excess condensed water is discharged through the condensed water outlet pipe 19. Before the system is operated, the bottom of the separating cylinder plate 16 should be first filled with tap water to ensure that the evaporator coil 24 can absorb heat to realize the heat pump cycle.
High-temperature and high-pressure refrigerant at the outlet of the heat pump compressor 2 enters the heating coil 21 to heat materials, and then is throttled by the expansion valve 22 and then is sent to the primary heat exchanger 23 and the evaporator coil 24 to carry out heat recovery. The heating coil 21 is immersed in the material of the condensing low-temperature evaporation concentration tank 1. Preferably, the heating coil 21 and the evaporator coil 24 are internally ribbed to enhance heat transfer within the tubes.
A elementary condensing system cold source for elementary condensing coil 33 is refrigerated adopts the efficient evaporative cooling mode, and the secondary steam that evaporates out to integral type multiple-effect condensation low temperature evaporation concentration jar 1 through the cooling water that evaporative cooling equipment 3 produced precools to guarantee heat pump circulation system's cold and heat balance, when outdoor meteorological condition changes, cooling water temperature control unit 32 is used for controlling elementary condensing coil 33's the temperature of intaking is with control its cooling capacity.
The non-condensable gas such as residual steam, air and the like processed by the condensation low-temperature evaporation concentration tank 1 is discharged by vacuumizing, a vacuumizing circulating pump 4 pumps water in a water tank 44, one part of the non-condensable gas is pumped by a vacuum ejector 41 and then is discharged into the water tank 44 through a porous pipe 43, and the other part of the non-condensable gas is sent into the primary heat exchanger 23 to exchange heat with the refrigerant, so that the heat recovery of the heat pump system is increased, and the water temperature in the water tank 44 is reduced. A liquid blocking baffle 42 is arranged at the suction port of the vacuum line of the vacuum ejector 41 to prevent the suction of condensed water, and the porous pipe 43 is arranged in the water tank 44 and is immersed in the water to directly absorb the residual steam. The circulating water temperature control device 45 is used for regulating and controlling the water temperature in the water tank 44 to be at a lower level so as to improve the efficiency of the vacuum-pumping system.
According to the application, the integrated multi-effect condensation low-temperature evaporation concentration system is characterized in that a liquid blocking baffle of the vacuumizing system is arranged at a suction inlet of the vacuumizing pipe and used for preventing condensed water from being sucked, the porous pipe is arranged in the water tank and immersed in circulating water, the vacuumizing circulating pump simultaneously sends part of the circulating water into the primary heat exchanger for heat exchange, and the heat absorption capacity of a circulating system of the heat pump is increased while the water tank dissipates heat.
According to the application, concentrated system of integral type multiple effect condensation low temperature evaporation, wherein, the branch of vacuum ejector connects the evacuation pipeline, the play water piping connection of vacuum ejector porous pipe, the bottom of porous pipe is sealed, is provided with a plurality of efflux round holes all around.
The edge of the bottom plate of the separating cylinder plate is welded and sealed with the inner wall of the integrated multi-effect condensation low-temperature evaporation concentration tank 1, and secondary steam rises to the flow-dispersing fins through the inside of the separating cylinder plate cylinder, is subjected to flow dispersion by the flow-dispersing fins, and then turns back to the primary condensing coil 33 for condensation. The separating cylinder plate bottom plate, the separating cylinder plate cylinder and the inner wall of the integrated multi-effect condensation low-temperature evaporation concentration tank 1 are enclosed to form a circular cavity for accommodating the primary condensing coil 33, the atomizing spray head 110 and the evaporator coil 24, and meanwhile, the separating cylinder plate bottom plate receives condensed water.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The integrated multi-effect condensation low-temperature evaporation concentration system is characterized by comprising a condensation low-temperature evaporation concentration tank, a heat pump circulating compressor, a primary heat exchanger and evaporation cooling equipment, wherein a heating coil, stirring blades, a defoaming device, a primary condensation coil, an atomizing spray head, an evaporator coil, a separating barrel plate and a flow dispersing fin are arranged inside the condensation low-temperature evaporation concentration tank,
the separating cylinder plate comprises a bottom plate and a cylinder, the bottom plate of the separating cylinder plate and the inner wall of the condensing low-temperature evaporation concentration tank are welded into a whole to form a hollow annular cylindrical structure, and the cylinder of the separating cylinder plate is a steam flow channel;
the flow dispersing fins are arranged at the top of the cylinder of the separating cylinder plate;
the defoaming device is arranged between the liquid level of the material and the bottom plate of the separating cylinder plate;
the evaporator coil is arranged between the separating cylinder plate and the inner wall of the multi-effect condensation low-temperature evaporation concentration tank;
pumping a high-temperature and high-pressure refrigerant into the heating coil through the heat pump circulating compressor, stirring the dilute material which is heated and sent into the condensing low-temperature evaporation and concentration tank by the stirring sheet under a vacuum condition, purifying generated secondary steam by the foam eliminating device, and condensing the secondary steam after the secondary steam passes through the cylinder of the separating cylinder plate and the flow dispersing fins;
the primary condensing coil pipe performs cascade condensation heat exchange on secondary steam by using cooling water generated by the evaporative cooling equipment;
the cooled refrigerant is sent into the primary heat exchanger, circulated to the evaporator coil in the condensation low-temperature evaporation concentration tank for heat recovery, then sent to the heat pump circulating compressor, steam generated by heating of the dilute material is pre-cooled by the primary condensation coil to generate partial condensed water, and then atomized water sprayed by an atomization nozzle directly contacts with the condensation and absorption, is sprayed to the evaporator coil and is stored at the bottom of the separation barrel plate after being cooled;
the condensation low-temperature evaporation and concentration tank is provided with a condensate pump, a water inlet pipe of the condensate pump is connected with the upper part of the bottom plate of the separation barrel plate, a water outlet pipe of the condensate pump is connected with the atomizing nozzle, and the atomizing nozzle atomizes condensate water into fine liquid drops which directly contact with condensation to absorb water vapor;
and cooling water generated by the evaporation cooling equipment is input into the primary condensing coil to pre-cool secondary steam evaporated by the multi-effect condensation low-temperature evaporation concentration tank.
2. The integrated multi-effect condensation low-temperature evaporation concentration system according to claim 1, wherein the system comprises a vacuum pumping unit, and the non-condensable gas treated by the multi-effect condensation low-temperature evaporation concentration tank is discharged through vacuum pumping.
3. The integrated multi-effect condensation cryogenic evaporation concentration system of claim 2, wherein the evacuation unit comprises an evacuation circulation pump, a water tank, a vacuum ejector, wherein,
a porous pipe is arranged in the water tank and is immersed in water;
the vacuumizing circulating pump pumps water in the water tank, and a part of non-condensable gas generated by evaporating and condensing the dilute material is pumped by the vacuum ejector and then is discharged into the water tank through the porous pipe; the other part is sent to the primary heat exchanger to exchange heat with the refrigerant.
4. The integrated multi-effect condensation low-temperature evaporation and concentration system as claimed in claim 3, wherein a liquid blocking baffle is arranged at a suction inlet of a vacuum pumping pipeline of the vacuum ejector.
5. The integrated multi-effect condensation and low-temperature evaporation concentration system as claimed in claim 3, wherein the vacuum pumping unit further comprises a circulating water temperature control device for controlling the temperature of water in the water tank.
6. The integrated multi-effect condensation low-temperature evaporation concentration system according to claim 1, wherein a dilute feed liquid inlet pipe and a concentrated feed liquid outlet pipe are connected to the outside of the condensation low-temperature evaporation concentration tank.
7. The integrated multi-effect condensation low-temperature evaporation concentration system as claimed in claim 1, wherein the outer wall of the integrated multi-effect condensation low-temperature evaporation concentration tank is provided with an insulating layer.
8. The integrated multi-effect condensation and low-temperature evaporation concentration system as claimed in claim 1, wherein the condensate pump is connected with the upper part of the bottom plate of the separation barrel plate through a water inlet pipe, and the water outlet pipe is connected with the atomizing spray head.
9. The integrated multi-effect condensing cryogenic evaporative concentration system of claim 1 wherein the heating coils and the evaporator coils are internally ribbed tubes that enhance heat transfer within the tubes.
10. The integrated multi-effect condensation low-temperature evaporation concentration system according to claim 1, further comprising a solar material preheating unit, wherein the solar material preheating unit comprises a solar heat collector, a thin liquid preheating tank, a preheating circulating pump and a preheating tank temperature control device, wherein the solar heat collector provides a heat source, the heat is heated by hot water circulation in a preheating coil in the thin liquid preheating tank to reach a set temperature, the heat is sent into the multi-effect condensation low-temperature evaporation concentration tank, the preheating tank temperature control device is used for controlling the water inlet temperature of the preheating coil, and the preheating circulating pump is used for providing hot water circulation power.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118526803A (en) * | 2024-07-25 | 2024-08-23 | 山西鸿生化工股份有限公司 | Sodium cyanide evaporation concentration equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118526803A (en) * | 2024-07-25 | 2024-08-23 | 山西鸿生化工股份有限公司 | Sodium cyanide evaporation concentration equipment |
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