CN216155528U - Flash evaporator and hot fresh water preparation device - Google Patents
Flash evaporator and hot fresh water preparation device Download PDFInfo
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- CN216155528U CN216155528U CN202021646543.8U CN202021646543U CN216155528U CN 216155528 U CN216155528 U CN 216155528U CN 202021646543 U CN202021646543 U CN 202021646543U CN 216155528 U CN216155528 U CN 216155528U
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Abstract
The utility model discloses a flash evaporator and a hot fresh water preparation device, wherein the flash evaporator comprises: a raw material liquid preheating zone for preheating the raw material liquid; the concentrated solution flash evaporation area is used for carrying out flash evaporation concentration on the raw material solution to generate concentrated solution and steam; the condensed water generating zone is arranged below the raw material liquid preheating zone; and the external fresh water pipeline is communicated with the condensed water generation area and is used for introducing external low-temperature fresh water into the flash evaporator. The device combines the preparation of fresh water and heating to realize hydrothermal coproduction; meanwhile, external fresh water is introduced, and heat energy generated in the process of preparing the fresh water is utilized to heat the external fresh water, so that the heat energy utilization rate is improved.
Description
Technical Field
The utility model relates to the technical field of fresh water preparation and centralized heating, in particular to a flash evaporator and a hot fresh water preparation device.
Background
With the rapid development of economy and society in China, the problem of water resource shortage is increasingly highlighted, and various seawater desalination technologies based on different principles and processes are gradually paid attention.
At present, the seawater desalination technology is widely applied in the middle east, the aim of the seawater desalination technology is to produce as much fresh water as possible, but the problem of energy consumption in the fresh water preparation process is not paid much attention, and a large amount of waste heat is discharged into the environment and is not effectively utilized in the fresh water preparation process.
Under the background of energy shortage at present, the problem of energy consumption must be considered in seawater desalination, how to fully utilize waste heat to improve the energy utilization efficiency and finally reduce the operation cost will determine whether the seawater desalination technology can be popularized in China on a large scale.
On the other hand, considering that many areas of China have heat supply requirements in winter, and the requirements are increased along with the improvement of the living standard of people, the heat originally discharged as waste heat in the seawater desalination process has strong application places, and can be used for centralized heat supply while preparing fresh water, so that the hydrothermal coproduction is realized, the application range of the seawater desalination technology is widened, and the fresh water preparation cost can be obviously reduced by selling heat to hot users. In addition, the fresh water preparation is not limited to seawater desalination, and industrial and domestic wastewater, reclaimed water, river water, lake water and the like can be hydrothermally co-produced in the mode.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide a flash evaporator and a hot fresh water preparation device, which combine the preparation and heating of fresh water to realize hydrothermal coproduction, fully utilize heat energy generated in the process of preparing fresh water, and obtain hot fresh water which can be used for central heating and can meet the heating requirement of residents in winter while improving the energy utilization efficiency; meanwhile, external low-temperature fresh water is introduced to improve the heat transfer temperature difference in the fresh water heating process in each stage of flash evaporator, thereby effectively reducing the heat transfer area and remarkably reducing the initial investment cost of equipment.
To solve the above technical problem, a first aspect of an embodiment of the present invention provides a flash evaporator, including: a raw material liquid preheating zone for preheating the raw material liquid; the concentrated solution flash evaporation area is communicated with the raw material solution preheating area and is used for carrying out flash evaporation concentration on the raw material solution to generate concentrated solution and steam; the condensed water generating zone is arranged below the raw material liquid preheating zone; and the external fresh water pipeline is communicated with the condensed water generation area and is used for introducing external low-temperature fresh water into the flash evaporator.
Further, the external fresh water pipeline further comprises: the external fresh water heat exchange area is provided with an external fresh water outlet; the external fresh water heat exchange area is arranged above the condensed water generation area; the condensed water generating area is provided with a condensed water outlet, the external fresh water outlet is communicated with the condensed water outlet, and the condensed water outlet and the external fresh water outlet are both used for discharging hot fresh water.
A second aspect of an embodiment of the present invention provides a hot fresh water producing apparatus, including: a flash evaporator of N stages, wherein the flash evaporator in the flash evaporator of N stages is the flash evaporator of claim 1 or 2; the condenser comprises a cold side inlet and a cold side outlet, and is used for heating the raw material liquid to the temperature required by the flash evaporation of the 1 st-stage flash evaporator; the concentrated solution flash evaporation zone is provided with a concentrated solution inlet and a concentrated solution outlet, and the raw material solution preheating zone is provided with a raw material solution inlet and a raw material solution outlet; a concentrated solution inlet of an Mth-stage flash evaporator in the N-stage flash evaporator is communicated with a concentrated solution outlet of an Mth-1-stage flash evaporator, a raw material solution outlet of the Mth-stage flash evaporator is communicated with a raw material solution inlet of the Mth-1-stage flash evaporator, a cold side inlet of a condenser is communicated with a raw material solution outlet of a first-stage flash evaporator, and a cold side outlet of the condenser is communicated with a concentrated solution inlet of the first-stage flash evaporator; wherein N is more than or equal to M and more than or equal to 2.
Furthermore, a condensed water inlet is also formed in the condensed water generating area; and a condensed water outlet of an Mth-stage flash evaporator in the N-stage flash evaporator is communicated with a condensed water inlet of an Mth-1-stage flash evaporator, and an external fresh water pipeline of each stage of flash evaporator is communicated with the condensed water inlet.
Further, the external fresh water heat exchange area is also provided with an external fresh water inlet; an external fresh water inlet of a G-1 stage flash evaporator in the N-stage flash evaporator is respectively communicated with an external fresh water outlet of the G-stage flash evaporator and a condensed water outlet of the G-stage flash evaporator, the external fresh water inlet of the N-stage flash evaporator in the N-stage flash evaporator is used for introducing external low-temperature fresh water into the N-stage flash evaporator, and the external fresh water outlet of the 1-stage flash evaporator and the condensed water outlet of the 1-stage flash evaporator are used for discharging hot fresh water; wherein N is more than or equal to G and more than or equal to 2.
Further, a concentrated solution flash evaporation area of each stage of the N-stage flash evaporator is of an open container structure, and the concentrated solution flash evaporation area is positioned at the bottom of the flash evaporator; the concentrated solution is flashed in a concentrated solution flashing area to generate steam, and the concentrated solution is concentrated and cooled.
Furthermore, a raw material liquid preheating zone of each stage of flash evaporator in the N-stage flash evaporator is of a partition wall type structure, and the raw material liquid preheating zone is positioned above the condensed water generation zone; and part of water vapor generated by flash evaporation is condensed in the raw material liquid preheating zone, the condensation heat is released, the raw material liquid is heated through the heat exchange wall, and simultaneously condensed water generated by condensation falls into the condensed water generation zone below.
Furthermore, the external fresh water heat exchange area of each stage of the N-stage flash evaporator is of a dividing wall type structure, and the external fresh water heat exchange area is positioned above the condensed water generation area; part of vapor generated by flash evaporation is condensed in the external fresh water heat exchange area, condensation heat is released, the external fresh water is heated through the heat exchange wall, and meanwhile condensation water generated by condensation falls into the condensate water generation area below.
Furthermore, a condensed water generation area of each stage of flash evaporator in the N-stage flash evaporator is of an open container structure, and the condensed water generation area is positioned above the concentrated solution flash evaporation area; the condensed water generation area receives condensed water generated by condensing the flashed water vapor.
Further, the hot fresh water preparing apparatus further comprises: a multi-stage return line; the input end of one of the multi-stage reflux pipelines is communicated with a concentrated solution outlet of a K-stage flash evaporator of the N-stage flash evaporator, and the output end of the reflux pipeline is communicated with a raw material solution inlet of a P-stage flash evaporator of the N-stage flash evaporator; wherein N is more than or equal to 2, N is more than or equal to K and more than or equal to P is more than or equal to 1.
Further, the condenser is a surface heater or a hybrid heater.
The technical scheme of the embodiment of the utility model has the following beneficial technical effects:
the preparation of fresh water is combined with heating, so that hydrothermal coproduction is realized; meanwhile, external fresh water is introduced, heat energy generated in the process of preparing the fresh water is fully utilized to heat the external fresh water, and the hot fresh water which can be used for central heating and meets the requirement of residents on heating in winter is obtained while the energy utilization efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of a hot fresh water producing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a hot fresh water producing apparatus according to a second embodiment of the present invention.
Reference numerals:
1: a flash evaporator; 2: a reflux pump; 3: a condenser; 1-A: a concentrate flash zone; 1-B: a feed solution preheating zone; 1-C: a condensed water generating region; 1-D: an external fresh water heat exchange area; 1-1: a concentrated solution inlet; 1-2: a concentrated solution outlet; 1-3: a feed solution inlet; 1-4: a raw material liquid outlet; 1-5: a condensed water inlet; 1-6: a condensed water outlet; 1-7: an external fresh water inlet; 1-8: an external fresh water outlet; 2-1: an input end of a return line; 2-2: an output end of the return line; 3-1: a hot side inlet; 3-2: a hot side outlet; 3-3: a cold side inlet; 3-4: a cold side outlet.
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 further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The various regions, shapes, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as the actual requirements dictate.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The utility model will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
In a first aspect, an embodiment of the present invention provides a flash evaporator, including: a raw material liquid preheating zone 1-B for preheating a raw material liquid; the concentrated solution flash evaporation area 1-A is used for carrying out flash evaporation concentration on the raw material solution to generate concentrated solution and steam; a condensed water generation zone 1-C arranged below the raw material liquid preheating zone 1-B; and the external fresh water pipeline is communicated with the condensed water generation area 1-C and is used for introducing external low-temperature fresh water into the flash evaporator 1. And the water vapor generated in the concentrated solution flash evaporation area 1-A exchanges heat with the raw material solution in the raw material solution preheating area 1-B and is condensed to generate condensed water, and the condensed water falls to the condensed water generation area 1-C.
The device provided by the utility model not only heats the fresh water introduced from the outside, but also prepares new fresh water, finally obtains hot fresh water, can supply heat while generating fresh water, and realizes hydrothermal coproduction.
In some embodiments, the condensate formation zone 1-C is provided with a condensate inlet 1-5, and an external fresh water line is connected to the condensate inlet 1-5, so that external low temperature fresh water is introduced into the condensate formation zone 1-C to join the condensate in the condensate formation zone 1-C and be heated by the steam generated by the flash evaporation. Alternatively, when the fresh water line is closed, only the flash evaporator 1 itself is heated to produce hot fresh water without heating the fresh water.
In some embodiments, flash vessel 1 further comprises: the external fresh water heat exchange area 1-D is provided with an external fresh water outlet 1-8; the external fresh water heat exchange area 1-D is arranged above the condensed water generation area 1-C; the condensed water generating area 1-C is provided with condensed water outlets 1-6, external fresh water outlets 1-8 are communicated with the condensed water outlets 1-6, and the condensed water outlets 1-6 and the external fresh water outlets 1-8 are used for discharging hot fresh water.
And partial water vapor exchanges heat with external fresh water in the external fresh water heat exchange area 1-D to heat external low-temperature fresh water, the water vapor is condensed to generate condensed water, and the condensed water falls to the condensed water generation area 1-C. The external fresh water heat exchange area 1-D is communicated with a condensed water outlet 1-6 of the condensed water generation area 1-C through an external fresh water outlet 1-8, and is used for converging condensed water generated by the condensed water generation area 1-C and heated external fresh water and discharging the condensed water and the heated external fresh water out of the flash evaporator 1, and the discharged mixed water is hot fresh water and can be used by heat users.
In other embodiments, the external fresh water heat exchange zone 1-D is disposed above the condensed water generation zone 1-C, and the external fresh water outlet 1-8 directly discharges the heated external fresh water without merging with the condensed water generated in the condensed water generation zone 1-C.
A second aspect of an embodiment of the present invention provides a hot fresh water producing apparatus, including: n-stage flash evaporator 1, flash evaporator 1 in N-stage flash evaporator 1 being flash evaporator 1 of claim 1 or 2; the condenser 3 comprises a cold side inlet 3-3 and a cold side outlet 3-4, and the condenser 3 is used for heating the raw material liquid to the temperature required by the flash evaporation of the 1 st-stage flash evaporator; the concentrated solution flash evaporation zone 1-A is provided with a concentrated solution inlet 1-1 and a concentrated solution outlet 1-2, and the raw material solution preheating zone 1-B is provided with a raw material solution inlet 1-3 and a raw material solution outlet 1-4; a concentrated solution inlet 1-1 of an Mth-stage flash evaporator 1 in the N-stage flash evaporator 1 is communicated with a concentrated solution outlet 1-2 of the Mth-1-stage flash evaporator 1, a raw solution outlet 1-4 of the Mth-stage flash evaporator 1 is communicated with a raw solution inlet 1-3 of the Mth-1-stage flash evaporator 1, a cold side inlet 3-3 of a condenser 3 is communicated with a raw solution outlet 1-4 of the first-stage flash evaporator 1, and a cold side outlet 3-4 of the condenser 3 is communicated with a concentrated solution inlet 1-1 of the first-stage flash evaporator 1; wherein N is more than or equal to M and more than or equal to 3.
A raw material liquid preheating zone 1-B of the multistage flash evaporator 1 heats the raw material liquid step by step; concentrating and cooling the raw material liquid in a concentrated liquid flash evaporation area 1-A of the multistage flash evaporator 1 to generate concentrated liquid and steam step by step; the multi-stage condensate water generation area 1-C collects condensate water after water vapor condensation step by step to obtain hot fresh water step by step; the external fresh water exchanges heat with the steam generated by flash evaporation of the flash evaporator 1 step by step, so that the external fresh water is output and becomes hot fresh water.
In a specific embodiment, the condenser 3 further comprises a hot side inlet 3-1 and a hot side outlet 3-2, driving steam to enter the condenser 3 from the hot side inlet 3-1 to exchange heat with raw material liquid entering from the cold side inlet 3-3, condensing the driving steam, releasing condensation heat, and heating the raw material liquid, so that the raw material liquid reaches a temperature required by flash evaporation of the 1 st-stage flash evaporator, and condensed water generated by condensation flows out from the hot side outlet 3-2.
In some embodiments, the condenser 3 is a surface heater or a hybrid heater.
In some embodiments, condensate formation zone 1-C is further provided with condensate inlet 1-5; condensed water outlets 1-6 of an Mth-stage flash evaporator 1 in the N-stage flash evaporator 1 are communicated with condensed water inlets 1-5 of the Mth-1-stage flash evaporator 1, and an external fresh water pipeline of each stage of flash evaporator 1 is communicated with the condensed water inlets 1-5. Optionally, condensed water inlets 1-5 of the nth stage flash vessel 1 in the N stage flash vessel 1 are in a closed state.
In some embodiments, the external fresh water pipeline of each flash evaporator 1 of the N-stage flash evaporators 1 is communicated with the condensate water inlet 1-5 of the corresponding one-stage flash evaporator 1, so that the external low-temperature fresh water is introduced into each condensate water generation zone 1-C of the N-stage flash evaporators 1 and is merged with the condensate water of the condensate water generation zone 1-C. Alternatively, the external fresh water line of the mth stage flash evaporator 1 of the N-stage flash evaporator 1 is closed, and preferably, only the external fresh water line of the nth stage flash evaporator 1 is opened. During the actual production process, the external fresh water pipelines of each stage of flash evaporator 1 are opened or closed according to requirements.
In the specific embodiment, condensed water inlets 1-5 of the N-th stage flash evaporator 1 in the N-stage flash evaporator 1 are closed.
In some embodiments, the external fresh water heat exchange zone 1-D is further provided with an external fresh water inlet 1-7; an external fresh water inlet 1-7 of a G-1 stage flash evaporator 1 in the N-stage flash evaporator 1 is respectively communicated with an external fresh water outlet 1-8 of the G-stage flash evaporator 1 and a condensed water outlet 1-6 of the G-stage flash evaporator 1, an external fresh water inlet 1-7 of the N-stage flash evaporator 1 in the N-stage flash evaporator 1 is used for introducing external low-temperature fresh water into the N-stage flash evaporator 1, and an external fresh water outlet 1-8 of the 1-stage flash evaporator 1 and a condensed water outlet 1-6 of the 1-stage flash evaporator 1 are used for discharging hot fresh water; wherein N is more than or equal to G and more than or equal to 2.
In other embodiments, each stage of external fresh water heat exchange area 1-D of the N-stage flash evaporator 1 is disposed above the corresponding condensate water generation area 1-C, external fresh water inlets 1-7 of the G-1 stage flash evaporator 1 in the N-stage flash evaporator 1 are communicated with external fresh water outlets 1-8 of the G-stage flash evaporator 1, the external fresh water inlet 1-7 of the N-stage flash evaporator 1 is used for introducing external low-temperature fresh water into the external fresh water heat exchange areas 1-D, and the external fresh water outlet 1-8 of the 1-stage flash evaporator 1 discharges all heated external fresh water in the N-stage flash evaporator 1. The external fresh water outlets 1 to 8 discharge the heated external fresh water separately, without merging with the condensed water generated in the condensed water generation region 1 to C. Optionally, the external fresh water is low-temperature distilled water, low-temperature purified water or low-temperature mineral water, and in the actual production process, the heated fresh water separately discharged from the external fresh water pipeline can be directly supplied to a hot user without entering a factory for purification and other operations.
In some embodiments, concentrate flashing zone 1-a of each flash vessel 1 of N-stage flash vessels 1 is an open vessel configuration, and concentrate flashing zone 1-a is located at the bottom of flash vessel 1; the concentrated solution is flashed in a concentrated solution flashing area 1-A to generate steam, and the concentrated solution is concentrated and cooled.
In some embodiments, feed preheating zone 1-B of each of N-stage flash evaporators 1 is a dividing wall configuration, with feed preheating zone 1-B located above condensate formation zone 1-C; and part of water vapor generated by flash evaporation is condensed in the raw material liquid preheating zone 1-B, the condensation heat is released, the raw material liquid is heated through the heat exchange wall, and simultaneously, condensed water generated by condensation falls into the lower condensed water generation zone 1-C.
In some embodiments, the external fresh water heat exchange zone 1-D of each flash evaporator 1 in the N-stage flash evaporators 1 is a dividing wall structure, and the external fresh water heat exchange zone 1-D is located above the condensed water generation zone 1-C; and part of water vapor generated by flash evaporation is condensed in the external fresh water heat exchange area 1-D, condensation heat is released, the external fresh water is heated through the heat exchange wall, and condensed water generated by condensation falls into the lower condensed water generation area 1-C.
In some embodiments, condensate generation zone 1-C of each flash vessel 1 of N-stage flash vessels 1 is an open vessel configuration, with condensate generation zone 1-C located above concentrate flash zone 1-a; the condensed water generation zone 1-C receives condensed water generated by condensation of the flashed water vapor.
In some embodiments, the fresh water producing and heating apparatus further comprises: a multi-stage return line; an input end 2-1 of one stage of reflux pipelines in the multistage reflux pipelines is communicated with a concentrated solution outlet 1-2 of a K-th stage flash evaporator 1 of the N-stage flash evaporator 1, and an output end 2-2 of the reflux pipelines is communicated with a raw material solution inlet 1-3 of a P-th stage flash evaporator 1 of the N-stage flash evaporator 1; wherein N is more than or equal to 2, N is more than or equal to K and more than or equal to P is more than or equal to 1.
In some embodiments, the reflux line can reflux a portion of the concentrate from the concentrate flash zone 1-a to the feed flash zone depending on the terrain.
In some embodiments, at least one of the multiple stages of return conduits is provided with a return pump 2, and the return pump 2 is configured to assist the return conduit in pumping a portion of the concentrate from the concentrate flash zone 1-a into the feedstock flash zone, merging with the feedstock, and subjecting the concentrate to flash heating again to obtain a concentrate meeting the concentration requirement.
In some embodiments, the feedstock liquid is seawater, river water, lake water, groundwater, sewage, wastewater, or reclaimed water.
Example one
Referring to fig. 1, in the present embodiment, an external fresh water pipeline is disposed at a condensed water inlet 1-5 of each flash evaporator 1 of the N-stage flash evaporators 1, and the external fresh water pipeline introduces external low-temperature fresh water into a condensed water generating region 1-C through an external fresh water inlet 1-7, so that the external low-temperature fresh water and the condensed water are collected to perform multi-stage heat exchange together.
In a specific embodiment, the external fresh water with lower temperature flows into the condensed water generation area 1-C to be converged with the condensed water generated by the flash evaporator 1, on one hand, the condensed water with higher temperature provides a part of heat for the external fresh water, on the other hand, the high-temperature water vapor generated by the flash evaporator 1 exchanges heat with the condensed water generation area 1-C with lower temperature after the external low-temperature fresh water is introduced, so that a part of heat is further provided for the external fresh water, the condensation process of the water vapor is accelerated, and the condensation efficiency of each stage of the flash evaporator 1 is improved.
In an optional embodiment, the condensate water generation area 1-C is provided with a spraying device, and the spraying device sprays a mixture of external fresh water and condensate water with lower temperature to a half space to contact with water vapor for heat exchange, so that the heat exchange area is increased, and the heat exchange efficiency is improved.
In an alternative embodiment, the external fresh water line of the L-th stage flash evaporator in the N-stage flash evaporator is closed, wherein N > L.
Example two
Referring to fig. 2, in the present embodiment, external fresh water is introduced into the external fresh water heat exchange area 1-D, and optionally, the external fresh water heat exchange area 1-D is a dividing wall structure.
In a specific embodiment, external fresh water with lower temperature is introduced into one side of the wall surface of the dividing wall type external fresh water heat exchange area 1-D, water vapor generated by the flash evaporator 1 contacts with the other side of the wall surface of the external fresh water heat exchange area 1-D for heat exchange, heat is transferred to the external fresh water, and meanwhile, the water vapor is condensed into condensed water through heat exchange and falls into a condensed water generation area 1-C arranged below the external fresh water heat exchange area 1-D.
In some embodiments, the M-stage external fresh water heat exchange area 1-D fresh water outlet 1-6 is communicated with the condensed water outlet 1-6 of the M-stage condensed water generation area 1-C, and the external fresh water and the condensed water are merged and then discharged into the M-1 stage flash evaporator 1 through the M-1 stage external fresh water heat exchange area 1-D fresh water inlet.
In other embodiments, the M-level external fresh water heat exchange area 1-D fresh water outlet 1-6 is communicated with the M-1-level external fresh water heat exchange area 1-D fresh water inlet, and finally, the external fresh water is discharged from the first-level external fresh water heat exchange area 1-D fresh water outlet 1-6, and the hot fresh water discharged from the external fresh water heat exchange area 1-D can be directly used for heating of a heat user without being processed by a thermal power plant.
The embodiment of the utility model aims to protect a flash evaporator and a fresh water preparation and heating device, and has the following effects:
the utility model combines the preparation and heating of fresh water, prepares new hot fresh water while heating the existing fresh water, and utilizes a heat supply pipe network to convey the hot fresh water to a heat consumer, and finally conveys the cooled fresh water to a tap water plant for further purification, thereby realizing the co-production of water and heat; as the most fundamental energy source for the operation of the device, the heat of the driving steam is fully utilized for the heating and preparation of the fresh water, and almost no waste heat is discharged, so that the device has high energy utilization rate, low operation cost and good application prospect.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the utility model and are not to be construed as limiting the utility model. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A flash evaporator, comprising:
a raw material liquid preheating zone (1-B) for preheating a raw material liquid;
a concentrate flash zone (1-A), said concentrate flash zone (1-A) for flash concentrating said feedstock to produce a concentrate and steam;
a condensed water generation zone (1-C) provided below the raw material liquid preheating zone (1-B);
an external fresh water line in communication with the condensate generating zone (1-C), the external fresh water line being configured to introduce external low temperature fresh water into the flash vessel (1);
the external fresh water pipeline further comprises: an external fresh water heat exchange area (1-D), wherein the external fresh water heat exchange area (1-D) is provided with an external fresh water outlet (1-8);
the external fresh water heat exchange area (1-D) is arranged above the condensed water generation area (1-C);
the condensed water generating area (1-C) is provided with a condensed water outlet (1-6), the external fresh water outlet (1-8) is communicated with the condensed water outlet (1-6), and the condensed water outlet (1-6) and the external fresh water outlet (1-8) are both used for discharging hot fresh water.
2. A hot fresh water producing apparatus, comprising:
a flash vessel (1) of N stages, wherein the flash vessel (1) in the flash vessel (1) of N stages is the flash vessel (1) of claim 1;
a condenser (3) comprising a cold side inlet (3-3) and a cold side outlet (3-4), the condenser (3) being used for heating the feed liquid to a temperature required for the flash evaporation in the 1 st stage flash evaporator;
the concentrated solution flash evaporation zone (1-A) is provided with a concentrated solution inlet (1-1) and a concentrated solution outlet (1-2), and the raw material solution preheating zone (1-B) is provided with a raw material solution inlet (1-3) and a raw material solution outlet (1-4);
the concentrated solution inlet (1-1) of the Mth flash evaporator (1) in the N-stage flash evaporator (1) is communicated with the concentrated solution outlet (1-2) of the Mth flash evaporator (1), the raw solution outlet (1-4) of the Mth flash evaporator (1) is communicated with the raw solution inlet (1-3) of the Mth flash evaporator (1), the cold side inlet (3-3) of the condenser (3) is communicated with the raw solution outlet (1-4) of the first stage flash evaporator (1), and the cold side outlet (3-4) of the condenser (3) is communicated with the concentrated solution inlet (1-1) of the first stage flash evaporator (1);
wherein N is more than or equal to M and more than or equal to 2.
3. The apparatus of claim 2,
the condensed water generating area (1-C) is also provided with a condensed water inlet (1-5);
the condensed water outlet (1-6) of the Mth-stage flash evaporator (1) in the N-stage flash evaporator (1) is communicated with the condensed water inlet (1-5) of the Mth-1-stage flash evaporator (1), and the external fresh water pipeline of each stage of flash evaporator (1) is communicated with the condensed water inlet (1-5).
4. The apparatus of claim 2,
the external fresh water heat exchange area (1-D) is also provided with an external fresh water inlet (1-7);
the external fresh water inlets (1-7) of G-1 stage flash evaporators (1) in the N-stage flash evaporators (1) are respectively communicated with the external fresh water outlets (1-8) of the G-stage flash evaporators (1) and the condensed water outlets (1-6) of the G-stage flash evaporators (1), the external fresh water inlets (1-7) of N-stage flash evaporators (1) in the N-stage flash evaporators (1) are used for introducing external low-temperature fresh water into the N-stage flash evaporators (1), and the external fresh water outlets (1-8) of the 1-stage flash evaporators (1) and the condensed water outlets (1-6) of the 1-stage flash evaporators (1) are used for discharging hot fresh water;
wherein N is more than or equal to G and more than or equal to 2.
5. The apparatus of claim 2,
the concentrated solution flash evaporation area (1-A) of each stage of the N-stage flash evaporator (1) is of an open container structure, and the concentrated solution flash evaporation area (1-A) is positioned at the bottom of the flash evaporator (1);
the concentrated solution is flashed in the concentrated solution flashing area (1-A) to generate steam, and the concentrated solution is concentrated and cooled.
6. The apparatus of claim 2,
the raw material liquid preheating zone (1-B) of each stage of the flash evaporator (1) in the N-stage flash evaporator (1) is of a dividing wall type structure, and the raw material liquid preheating zone (1-B) is positioned above the condensed water generating zone (1-C);
and part of water vapor generated by flash evaporation is condensed in the raw material liquid preheating zone (1-B), the condensation heat is released, the raw material liquid is heated through a heat exchange wall, and the condensed water generated by condensation falls into the condensed water generation zone (1-C) below.
7. The apparatus of claim 2,
the external fresh water heat exchange area (1-D) of each stage of the flash evaporator (1) in the N-stage flash evaporator (1) is of a dividing wall type structure, and the external fresh water heat exchange area (1-D) is positioned above the condensed water generation area (1-C);
and part of vapor generated by flash evaporation is condensed in the external fresh water heat exchange area (1-D), condensation heat is released, the external fresh water is heated through the heat exchange wall, and condensed water generated by condensation falls into a condensed water generation area (1-C) below.
8. The apparatus of claim 2,
the condensed water generating area (1-C) of each stage of the N-stage flash evaporator (1) is of an open container structure, and the condensed water generating area (1-C) is positioned above the concentrated solution flash evaporation area (1-A);
the condensed water generation zone (1-C) receives condensed water generated by condensation of the flashed vapor.
9. The apparatus of claim 2, further comprising: a multi-stage return line;
the input end of one of the reflux pipelines is communicated with the concentrated solution outlet (1-2) of a K-th flash evaporator (1) of the N-stage flash evaporator (1), and the output end of the reflux pipeline is communicated with the raw material solution inlet (1-3) of a P-th flash evaporator (1) of the N-stage flash evaporator (1);
wherein N is more than or equal to 2, N is more than or equal to K and more than or equal to P is more than or equal to 1.
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