CN113398609A - Steam circulation heat supply evaporation equipment - Google Patents
Steam circulation heat supply evaporation equipment Download PDFInfo
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- CN113398609A CN113398609A CN202110824108.2A CN202110824108A CN113398609A CN 113398609 A CN113398609 A CN 113398609A CN 202110824108 A CN202110824108 A CN 202110824108A CN 113398609 A CN113398609 A CN 113398609A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0094—Evaporating with forced circulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0082—Regulation; Control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/28—Evaporating with vapour compression
- B01D1/289—Compressor features (e.g. constructions, details, cooling, lubrication, driving systems)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/063—Underpressure, vacuum
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention provides a steam circulation heat supply evaporation device, which comprises: the evaporation device comprises an evaporation tank and a first heat exchanger, wherein the first heat exchanger is a tubular heat exchanger; a heat pump compressor for providing a source of vapor heat to the first heat exchanger; the vacuumizing device is used for vacuumizing the evaporating pot; a second heat exchanger; the steam circulating pipeline is sequentially connected with the heat pump compressor, the first heat exchanger and the second heat exchanger; and the stock solution steam pipeline is sequentially connected with the evaporating tank, the second heat exchanger and the vacuumizing device, and the heat exchange is carried out between the stock solution steam generated by stock solution evaporation and condensed water generated after the heat exchange of the steam heat source in the first heat exchanger in the second heat exchanger. So set up, can effectively retrieve the heat, reduce steam equipment's whole energy consumption, impurity such as noncondensable gas wherein can also avoid when direct recycle stoste steam influences the operating stability of whole equipment.
Description
Technical Field
The invention relates to the technical field of evaporation, in particular to steam circulation heat supply evaporation equipment.
Background
At present, the evaporation process is a main measure for treating and recycling waste liquid, the treatment method and the treatment process are widely applied in modern industrial production, and the purpose is to basically remove moisture in the waste liquid to form distilled water and simultaneously improve the concentration of the waste liquid so as to meet the requirement of subsequent treatment. And evaporation process generally has higher energy consumption, therefore utilizes MVR evaporimeter to handle sewage waste liquid is the more common mode at present stage, and this mode can carry out recycle to the steam that the evaporation produced, and the energy consumption is less.
However, in the process, no matter the raw liquid steam generated by evaporation is directly utilized or the raw liquid steam is purified by a gas-liquid separation device and then utilized, partial impurities or corrosive gas can be remained in the raw liquid steam, so that the heat pump compressor or the vapor compressor can be polluted or damaged to a certain extent, in addition, partial non-condensable gas also exists in the raw liquid steam, the operation stability of the heat pump compressor can be obviously influenced when the raw liquid steam is directly recycled, the energy consumption is increased, and the raw liquid treatment capacity is reduced.
Therefore, it is necessary to design a steam cycle heating and evaporating apparatus to solve the above problems.
Disclosure of Invention
The invention aims to provide a steam circulation heating and evaporating device which effectively utilizes the heat of stock solution steam.
In order to achieve the purpose, the invention adopts the following technical scheme: a steam cycle heating and evaporating apparatus comprising:
the evaporation device is used for evaporating the stock solution and comprises an evaporation tank and a first heat exchanger, wherein the first heat exchanger is a tubular heat exchanger;
a heat pump compressor for providing a source of vapor heat to the first heat exchanger;
the vacuumizing device is used for vacuumizing the evaporating pot;
a second heat exchanger;
the steam circulating pipeline is sequentially connected with the heat pump compressor, the first heat exchanger and the second heat exchanger;
and the stock solution steam pipeline is sequentially connected with the evaporating tank, the second heat exchanger and the vacuumizing device, and the heat exchange is carried out between the stock solution steam generated by stock solution evaporation and condensed water generated after the heat exchange of the steam heat source in the first heat exchanger in the second heat exchanger.
As a further improved technical scheme of the invention, the first heat exchanger is a coil or a tube array arranged in the evaporator, and the coil or the tube array is communicated with the heat pump compressor.
As a further improved technical scheme, the first heat exchanger comprises a plurality of mosquito-repellent incense coil pipes which are connected in parallel and are arranged in parallel along the axial direction, a first pipeline and a second pipeline, an inlet of each mosquito-repellent incense coil pipe is connected with the first pipeline, an outlet of each mosquito-repellent incense coil pipe is connected with the second pipeline, and the steam flows into each mosquito-repellent incense coil pipe through the first pipeline and flows out from the second pipeline.
As a further improved technical scheme of the invention, each mosquito coil is arranged in such a way that the steam flows into the inner side of the mosquito coil from the inlet and flows out from the outlet in a spiral way towards the outer side.
As a further improved technical scheme of the present invention, the first heat exchanger is disposed outside the evaporator tank, a stock solution circulation pipeline is disposed between the first heat exchanger and the evaporator tank, the first heat exchanger includes a housing and a coil or a tube array disposed in the housing, and the coil or the tube array is communicated with the stock solution circulation pipeline.
As a further improved technical scheme of the present invention, the steam circulation pipeline includes a high-temperature high-pressure steam pipeline, a gas-liquid mixed steam pipeline and a low-pressure steam pipeline, the high-temperature high-pressure steam pipeline is disposed between the heat pump compressor and the first heat exchanger to introduce high-temperature high-pressure steam generated by the heat pump compressor into the first heat exchanger, the gas-liquid mixed steam pipeline is disposed between the first heat exchanger and the second heat exchanger to transport a gas-liquid mixture after exchanging heat with the raw liquid in the first heat exchanger, and the low-pressure steam pipeline is disposed between the second heat exchanger and the heat pump compressor.
As a further improved technical solution of the present invention, the raw liquid vapor pipeline includes a high-temperature raw liquid vapor pipeline and a raw liquid vapor condensate pipeline, the high-temperature raw liquid vapor pipeline is disposed between the evaporation tank and the second heat exchanger, the raw liquid vapor condensate pipeline is disposed between the second heat exchanger and the vacuum pumping device, and the vacuum pumping device performs vacuum pumping on the inside of the evaporation tank through the raw liquid vapor condensate pipeline, the second heat exchanger and the high-temperature raw liquid vapor pipeline.
The invention also comprises a heating device for providing steam for the heat pump compressor; the second heat exchanger comprises a shell and a coil or a tube array arranged in the shell.
As a further improved technical scheme of the invention, the heat supply device is a steam generator, and a steam outlet of the steam generator is communicated with the shell.
As a further improved technical scheme of the invention, the heat supply device is a heater arranged in the shell.
As a further improved technical scheme of the invention, the steam circulation pipeline is also provided with a control device, the control device is used for controlling the steam pressure in the steam circulation pipeline, and the control device comprises a throttling device; the vacuum pumping device comprises an ejector, a water storage tank and a water pump which are connected in a circulating mode through pipelines, and the ejector is connected with the evaporation tank.
According to the technical scheme, the steam circulation pipeline, the stock solution steam pipeline and the second heat exchanger are arranged, so that heat of stock solution steam generated by stock solution evaporation can be effectively utilized, on one hand, the heat can be effectively recovered, the overall energy consumption of steam equipment is reduced, and on the other hand, the influence of impurities such as non-condensable gas or solid particles in the stock solution steam on the operation stability of the whole equipment can be avoided when the stock solution steam is directly recovered and utilized; secondly, the steam heat source and the stock solution can be recycled after heat exchange, condensation and recovery are not needed, the part of waste heat is effectively utilized, the overall energy consumption of the steam equipment is further reduced, and the energy is saved; in addition, the first heat exchanger and the vacuumizing device can greatly increase the treatment capacity, and can realize high heat exchange efficiency and high effluent quality at lower cost.
Drawings
Fig. 1 is a schematic view of a steam cycle heating and evaporating apparatus according to an embodiment of the present invention.
Fig. 2 is a perspective view of the first heat exchanger of fig. 1.
FIG. 3 is a schematic view of an evaporation apparatus according to another embodiment.
FIG. 4 is a schematic view of a second heat exchanger in another embodiment.
Fig. 5 is a schematic diagram of a heating device and a second heat exchanger in another embodiment.
Fig. 6 is a schematic view of the evacuation device of fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Please refer to fig. 1, which shows a steam cycle heating and evaporating apparatus, comprising: the system comprises an evaporation device 1, a heat pump compressor 2, a second heat exchanger 5, a vacuumizing device 6, a steam circulation pipeline 10, a stock solution steam pipeline 20 and a stock solution inlet pipeline 30. The raw liquid inlet line 30 communicates with the evaporation tank 11 to introduce the raw liquid thereto.
The evaporation device 1 comprises an evaporation tank 11 and a first heat exchanger 12, wherein the first heat exchanger 12 is a tubular heat exchanger. Preferably, the first heat exchanger 12 is a coil or a tube array arranged inside the evaporator 11, and the coil or the tube array is communicated with the heat pump compressor 2.
Specifically, referring to fig. 2, in the present embodiment, the first heat exchanger 12 includes a plurality of mosquito coil coils 125, a first pipe 123, a second pipe 124 and a fixing device 126, which are arranged in parallel and in parallel along the axial direction. The mosquito coil coils 125 are vertically and parallelly fixed on the fixing device 124, the first pipeline 123 and the second pipeline 124 are arranged on the periphery of the mosquito coil coils 125, the axial direction of the first pipeline 123 and the second pipeline 124 is perpendicular to the radial direction of the mosquito coil coils 125, and through holes (not shown) for respectively connecting each mosquito coil 125 are arranged on the first pipeline 123 and the second pipeline 124. The vapor is uniformly distributed to each coil 125 through a first conduit 123 and then collected and discharged from a second conduit 124.
In this embodiment, each coil 125 is configured to flow fluid from the inside of the coil 125 to the outside, specifically, the inside of the coil 125 is connected to the first pipe 123, and the outside of the coil 125 is connected to the second pipe 124. By adopting the arrangement mode, the pressure drop of the system caused by the fluid in the mosquito coil 125 can be avoided, thereby ensuring the stability of the heat exchange efficiency.
The fixing device 126 corresponds to a plurality of fixing plates 1261 spaced along the circumferential direction of the coil 125 and a positioning plate 1262 disposed at the periphery of the coil 125, each fixing plate 1261 extends along the radial direction, a slot 1263 corresponding to the diameter of the coil 125 is disposed on the fixing plate 1261, and the fixing plate 1261 is fixed on the positioning plate 1262. Specifically, the plurality of positioning plates 1262 are uniformly arranged on the periphery of the mosquito coil 125, the fixing plates 1261 are arranged layer by layer in the vertical direction of the positioning plates 1262, and the pipes of each mosquito coil 125 are clamped in the clamping grooves 1263 one by one. Preferably, there are gaps between adjacent coils 125 to increase their heat transfer area and facilitate later maintenance and repair.
In other embodiments, the first heat exchanger may also be arranged as a spiral coil or a tube array in the evaporation tank, and the connection manner of the first heat exchanger is similar to that of the mosquito coil, which is not described herein.
In other embodiments, the first heat exchanger may also be provided outside the evaporator tank, i.e. an external heat exchanger. Specifically, referring to fig. 3, an evaporation apparatus 1a according to another embodiment of the present invention is shown, in which the evaporation apparatus 1a includes an evaporation tank 11a, a first heat exchanger 12a disposed outside the evaporation tank 11a, a raw liquid circulation pipeline 14a, and a raw liquid circulation pump 13 a. The raw liquid inlet line 30 is connected to the raw liquid inlet line 30. In this embodiment, the first heat exchanger 12a includes a housing 121a and a plurality of rows of tubes 122a disposed in the housing 121 a. In other embodiments, the tubes 122a may be replaced by mosquito coil tubes, and the specific structure of the coil tubes is referred to the first heat exchanger 12, which is not described herein.
The vapor circulation pipeline 10 is connected to the heat pump compressor 2, the first heat exchanger 12 and the second heat exchanger 5 in sequence to circulate the heat source vapor. The heat pump compressor 2 is used to compress the vapor and provide a source of vapor heat to the first heat exchanger 12. The raw liquid steam pipeline 20 is sequentially connected with the evaporating pot 11, the second heat exchanger 5 and the vacuumizing device 6, and raw liquid steam generated by raw liquid evaporation and condensed water generated after heat exchange of a steam heat source in the first heat exchanger 12 exchange heat in the second heat exchanger 5.
Specifically, the steam circulation pipeline 10 includes a high-temperature high-pressure steam pipeline 101, a gas-liquid mixed steam pipeline 102 and a low-pressure steam pipeline 103, the high-temperature high-pressure steam pipeline 101 is arranged between the heat pump compressor 2 and the first heat exchanger 12, so as to introduce high-temperature high-pressure steam generated by the heat pump compressor 2 into the first heat exchanger 12; the gas-liquid mixed steam pipeline 102 is arranged between the first heat exchanger 12 and the second heat exchanger 5, and is used for conveying a gas-liquid mixture after exchanging heat with the stock solution in the first heat exchanger 12. The low-pressure steam pipeline 103 is arranged between the second heat exchanger 5 and the heat pump compressor 2, and the heat pump compressor 2 decompresses and extracts the liquid condensate water in the second heat exchanger 5 through the low-pressure steam pipeline 103, so that the next round of compression is performed to form high-temperature and high-pressure steam.
Preferably, the steam circulation line 10 is further provided with a control device for controlling the steam pressure in the steam circulation line 10, which is provided on the gas-liquid mixed steam line 102. Preferably, the control device comprises a throttling device 3, the throttling device 3 can be a proportional control valve or a throttle valve, and the throttling device 3 is used for regulating the pressure and the temperature of the steam in the high-temperature high-pressure steam pipeline 101. Preferably, the pressure of the steam in the high temperature and high pressure steam line 101 is about 140KPa and the temperature is 110 ℃. In other embodiments, a water trap 4 may be disposed downstream of the throttling device 3, and the water trap 4 is configured to separate the gas-liquid mixture flowing through the gas-liquid mixed steam pipeline 102 and to introduce the condensed water in the liquid state into the second heat exchanger 5. The control device keeps the pressure and the temperature of high-temperature and high-pressure steam generated by the steam heat source and the heat pump compressor 2 constant, so that the heat pump compressor 2 works stably, the service life of the heat pump compressor 2 can be ensured, the energy consumption is reduced, the evaporation energy consumption is further reduced, and the cost is saved.
The raw liquid vapor pipeline 20 specifically includes a high-temperature raw liquid vapor pipeline 201 and a raw liquid vapor condensed water pipeline 202. The high-temperature stock solution steam pipeline 201 is arranged between the evaporating pot 11 and the second heat exchanger 5, and the stock solution steam condensate pipeline 202 is arranged between the second heat exchanger 5 and the vacuumizing device 6. The vacuumizing device 6 is used for vacuumizing the evaporation tank 11, and specifically, the vacuumizing device 6 vacuumizes the inside of the evaporation tank 11 through the raw liquid steam condensate water pipeline 202, the second heat exchanger 5 and the high-temperature raw liquid steam pipeline 201.
Therefore, the high-temperature stoste steam generated by the vaporization of the stoste and the condensed water are subjected to a heat exchange process in the second heat exchanger 5. The condensed water absorbs the heat of the high-temperature stock solution steam to raise the temperature and is gasified under the action of the heat pump compressor 2, and the high-temperature stock solution steam is cooled to become stock solution condensed water and is pumped out from the vacuum pumping device 6. In this embodiment, the second heat exchanger 5 is a tube type heat exchanger, and includes a housing 51 and a plurality of tubes 52 arranged in parallel in the housing 51, and a shell layer is formed between the housing 51 and the tubes 52. The stock solution vapor line 20 is communicated with the shell, and the vapor circulation line 10 is communicated with the tube array 52. Thus, heat exchange between the high-temperature stock solution steam and the condensed water is carried out. Through second heat exchanger 5, utilize the heat energy of the stoste steam that the stoste evaporated for but steam cycle uses, continuously provides and evaporates the heat source, need not to use external steam continuously, and the heat source steam consumption that significantly reduces has reduced the evaporation system energy consumption, has reduced steam equipment's running cost.
In the present invention, the form of the second heat exchanger 5 may be selected from other types. Fig. 4 is a schematic view of a second heat exchanger 5c in another embodiment, which includes a casing 51c and a coil 52c disposed in the casing 51c, wherein a shell layer is formed between the casing 51c and the coil 52 c. The stoste vapor line 20 is in communication with the coil 52c and the vapor circulation line 10 is in communication with the shell. So set up, can realize the heat transfer of high temperature stoste steam and comdenstion water equally.
In this embodiment, steam cycle heat supply evaporating apparatus still includes the heating device who provides steam to the heat pump compressor, and its effect is: an initial steam heat source is provided for the steam circulation line to rapidly start the evaporation process. In particular, in the present embodiment, the heating device 7 is a steam generator, and preferably, a steam outlet of the steam generator is communicated with the housing, that is: the steam outlet of the steam generator is communicated with the shell layer of the second heat exchanger 5, and the initial steam heat source generated by the steam generator is firstly introduced into the shell layer and then is sucked by the heat pump compressor 2.
Referring to fig. 5, in another embodiment, the heating device is a heater 7d disposed in a shell of the second heat exchanger 5, a certain amount of pure water is first disposed in the shell, and the heater 7d is used for heating the pure water to generate an initial steam heat source. In this embodiment, the raw liquid vapor line 20 communicates with the tubes 52, and the vapor circulation line 10 communicates with the shell. Thus, heat exchange between the high-temperature stock solution steam and the condensed water is carried out. In other embodiments, external steam can be directly used to provide an initial steam heat source for the steam circulation pipeline.
Referring to fig. 6, in the present embodiment, the vacuum pumping device 6 includes an ejector 61, a water storage tank 63, and a water pump 62, which are connected in sequence through a pipeline, and the ejector 61 is connected to the evaporation tank 11. The stock solution steam generated by the evaporation of the stock solution is converted into condensed water after heat exchange, and is pumped into a water storage tank 63 under the continuous working action of a water pump 62 and an ejector 61; the water storage tank 63 is provided with a drain valve 64 and a drain pump 65, liquid level switches 66, 67 and 68 are further arranged in the water storage tank 63 from top to bottom, the liquid level switch 66 is set to be at a high liquid level, the liquid level switch 67 is at a medium liquid level, the liquid level switch 68 is at a low liquid level, when the condensed water liquid level reaches the position of the liquid level switch 67, the drain valve 64 is opened, and the drain pump 65 works to drain the condensed water; when the condensate level reaches the level switch 68, the drain valve 64 closes and the drain pump 65 stops operating. In other embodiments, the vacuum device may be provided in other forms, such as a vacuum pump, a blower, etc. In this example, the vacuum degree of the evaporation tank 11 is maintained at-43 KPa, the evaporation temperature of the stock solution under the vacuum degree is lower than the boiling point temperature of the stock solution under the normal pressure, the temperature of the steam generated by the evaporation of the stock solution is about 85-90 ℃, and the stock solution enters the second heat exchanger 5 through the high-temperature stock solution steam pipeline 201. The arrangement of the vacuum extractor 6 ensures that the evaporation temperature of the stock solution is lower than the boiling point under normal pressure, so that the heat required by the evaporation of the stock solution is reduced. In other embodiments, the vacuum degree of the evaporation container may be set according to actual needs, and is not limited herein.
Preferably, a gas-liquid separation device (not shown) is further arranged between the evaporation tank 11 and the second heat exchanger 5, and the gas-liquid separation device is used for performing gas-liquid separation on the raw liquid steam generated by evaporation of the raw liquid so as to prevent the raw liquid steam from carrying raw liquid droplets or solid impurities to enter a subsequent device.
Preferably, a heat exchanger (not shown) is further provided between the vacuum extractor 6 and the second heat exchanger 5 to preheat the raw liquid, and the raw liquid is introduced into the evaporation tank 11 through the raw liquid inlet line 30. So set up, can further utilize remaining heat after stoste steam passes through the heat transfer of second heat exchanger 5, improve stoste temperature, and then reduce the required heat of stoste evaporation.
When the device works, firstly, the evaporation device 1 is started, the vacuumizing device 6 starts to operate, and the vacuumizing device 6 continuously pumps out gas in the evaporation tank 11, so that the negative pressure in the evaporation tank 11 is kept at a constant value; when the vacuum degree in the evaporation tank 11 reaches a set value, the stock solution enters the evaporation tank 11 through the stock solution inlet pipeline 30, meanwhile, the heat supply device 7 starts to provide an initial steam heat source for the heat pump compressor 2, the heat pump compressor 2 works, the steam is continuously pumped into the evaporation tank, the steam is converted into high-temperature high-pressure steam and is discharged, and the high-temperature high-pressure steam enters the first heat exchanger 12 through the high-temperature high-pressure steam pipeline 101 to be evaporated and used by the stock solution. The stock solution absorbs the heat of the high-temperature high-pressure steam, the temperature of the steam is reduced, the form of the steam is gradually changed into liquid from a water-gas mixed state, and the liquid enters a second heat exchanger 5 for heat exchange through a throttling device 3 and a hydrophobic device 4. Because the steam inlet 21 of the heat pump compressor 2 continuously sucks, the gas-liquid mixed steam pipeline 102 behind the water drainage device 4 is under negative pressure, the temperature of liquid hot water is reduced to 80-85 ℃, the heat energy of steam generated by stock solution evaporation is absorbed by the second heat exchanger 5, the steam is subjected to phase change at about 85 ℃, the liquid hot water is converted into steam with constant temperature and enters the heat pump compressor 2, the steam is converted into constant high-temperature and high-pressure steam (110 ℃) by the heat pump compressor 2 and is discharged, and the circulation is carried out.
The morphological change of the steam heat source can be seen from the above process: the heat pump compressor 2 absorbs the initial steam heat source and converts the initial steam heat source into high-temperature high-pressure steam, the high-temperature high-pressure steam enters the first heat exchanger 12 for evaporation, and after evaporation, the high-temperature high-pressure steam is gradually converted into liquid hot water from a water-gas mixture and enters the second heat exchanger 5 for heat exchange; the liquid hot water absorbs the heat energy of the evaporated steam of the stock solution, converts the heat energy into latent heat of vaporization, converts the latent heat into steam, and enters the heat pump compressor 2 through the low-pressure steam pipeline 103, and the heat pump compressor 2 converts the part of steam into high-temperature and high-pressure steam for the evaporation of the stock solution. In the change process, the initial heat source provided by the heat supply device 7 is changed into the heat source of the next evaporation cycle after the first evaporation cycle, so that the heat supply device 7 can stop providing the initial heat source, and the steam consumption is greatly reduced.
In conclusion, the steam circulation pipeline, the stock solution steam pipeline and the second heat exchanger are arranged, so that heat of stock solution steam generated by stock solution evaporation can be effectively utilized, on one hand, the heat can be effectively recovered, the overall energy consumption of steam equipment is reduced, and on the other hand, the influence of impurities such as non-condensable gas or solid particles in the stock solution steam on the operation stability of the whole equipment can be avoided when the stock solution steam is directly recovered and utilized; in addition, the steam heat source and the stock solution can be recycled after heat exchange, condensation recovery is not needed, the part of waste heat is effectively utilized, the overall energy consumption of the steam equipment is further reduced, and energy is saved; the evaporation equipment provided by the invention does not need to continuously introduce steam, and only needs to provide a steam heat source at the initial stage of operation of the evaporation device, so that the operation cost of the evaporation equipment is reduced; the evaporation equipment provided by the invention is provided with the vacuumizing device, so that the temperature required by the evaporation of the stock solution is lower, and the evaporation efficiency is improved.
The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and the understanding of the present specification should be based on the technical personnel in the technical field, and although the present specification has described the invention in detail with reference to the above embodiments, the technical personnel in the technical field should understand that the technical personnel in the technical field can still make modifications or equivalent substitutions to the present invention, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention should be covered in the claims of the present invention.
Claims (11)
1. A steam cycle heating vaporization apparatus, comprising:
the evaporation device is used for evaporating the stock solution and comprises an evaporation tank and a first heat exchanger, wherein the first heat exchanger is a tubular heat exchanger;
a heat pump compressor for providing a source of vapor heat to the first heat exchanger;
the vacuumizing device is used for vacuumizing the evaporating pot;
a second heat exchanger;
the steam circulating pipeline is sequentially connected with the heat pump compressor, the first heat exchanger and the second heat exchanger;
and the stock solution steam pipeline is sequentially connected with the evaporating tank, the second heat exchanger and the vacuumizing device, and the heat exchange is carried out between the stock solution steam generated by stock solution evaporation and condensed water generated after the heat exchange of the steam heat source in the first heat exchanger in the second heat exchanger.
2. A steam cycle heating and evaporating apparatus as claimed in claim 1, wherein the first heat exchanger is a coil or tube array disposed inside the evaporator, the coil or tube array being in communication with the heat pump compressor.
3. A steam cycle heating and evaporating apparatus as claimed in claim 1, wherein the first heat exchanger comprises a plurality of parallel and axially parallel coils, a first conduit and a second conduit, an inlet of each coil being connected to the first conduit and an outlet of each coil being connected to the second conduit, the steam flowing through the first conduit into each coil and out of the second conduit.
4. A steam cycle heating and evaporating apparatus as claimed in claim 2, wherein each coil is arranged so that the steam flows from the inlet into the inside of the coil and spirals outward and out of the outlet.
5. A steam cycle heating evaporation plant as claimed in claim 1, wherein the first heat exchanger is located outside the evaporation tank, a stock solution circulation pipeline is located between the first heat exchanger and the evaporation tank, the first heat exchanger comprises a housing and a coil or tube array located in the housing, and the coil or tube array is communicated with the stock solution circulation pipeline.
6. The steam cycle heating evaporation equipment according to claim 1, wherein the steam cycle pipeline comprises a high-temperature high-pressure steam pipeline, a gas-liquid mixed steam pipeline and a low-pressure steam pipeline, the high-temperature high-pressure steam pipeline is arranged between the heat pump compressor and the first heat exchanger so as to introduce high-temperature high-pressure steam generated by the heat pump compressor into the first heat exchanger, the gas-liquid mixed steam pipeline is arranged between the first heat exchanger and the second heat exchanger and is used for conveying a gas-liquid mixture after heat exchange with a stock solution in the first heat exchanger, and the low-pressure steam pipeline is arranged between the second heat exchanger and the heat pump compressor.
7. A steam cycle heating evaporation apparatus according to claim 1, wherein the raw liquid steam pipeline includes a high-temperature raw liquid steam pipeline and a raw liquid steam condensate pipeline, the high-temperature raw liquid steam pipeline is provided between the evaporation tank and the second heat exchanger, the raw liquid steam condensate pipeline is provided between the second heat exchanger and the vacuum pumping device, and the vacuum pumping device is configured to evacuate the inside of the evaporation tank through the raw liquid steam condensate pipeline, the second heat exchanger and the high-temperature raw liquid steam pipeline.
8. A steam cycle heating evaporation apparatus according to claim 1, further comprising a heating means for supplying steam to the heat pump compressor; the second heat exchanger comprises a shell and a coil or a tube array arranged in the shell.
9. A steam-cycle heating and evaporating apparatus as claimed in claim 8, wherein the heating means is a steam generator, the steam outlet of which communicates with the housing.
10. A steam cycle heating and evaporating apparatus as claimed in claim 8, wherein the heating means is a heater provided in the housing.
11. A steam cycle heating and evaporating apparatus as claimed in claim 1, wherein the steam cycle conduit is further provided with control means for controlling the steam pressure in the steam cycle conduit, the control means including throttling means; the vacuum pumping device comprises an ejector, a water storage tank and a water pump which are connected in a circulating mode through pipelines, and the ejector is connected with the evaporation tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110824108.2A CN113398609A (en) | 2021-07-21 | 2021-07-21 | Steam circulation heat supply evaporation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110824108.2A CN113398609A (en) | 2021-07-21 | 2021-07-21 | Steam circulation heat supply evaporation equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114377419A (en) * | 2022-01-18 | 2022-04-22 | 内蒙古科技大学 | Vacuum evaporation concentration system based on air source heat pump |
| CN115448398A (en) * | 2022-10-08 | 2022-12-09 | 杭州佰斯维环境科技有限公司 | Treatment device for metal processing wastewater |
-
2021
- 2021-07-21 CN CN202110824108.2A patent/CN113398609A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114377419A (en) * | 2022-01-18 | 2022-04-22 | 内蒙古科技大学 | Vacuum evaporation concentration system based on air source heat pump |
| CN115448398A (en) * | 2022-10-08 | 2022-12-09 | 杭州佰斯维环境科技有限公司 | Treatment device for metal processing wastewater |
| CN115448398B (en) * | 2022-10-08 | 2023-10-10 | 杭州佰斯维环境科技有限公司 | A processing apparatus for metalworking waste water |
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