CN112062189B - Multistage multi-heat-source evaporation type hot fresh water preparation device and method and waste heat recovery system - Google Patents
Multistage multi-heat-source evaporation type hot fresh water preparation device and method and waste heat recovery system Download PDFInfo
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- CN112062189B CN112062189B CN202010815755.2A CN202010815755A CN112062189B CN 112062189 B CN112062189 B CN 112062189B CN 202010815755 A CN202010815755 A CN 202010815755A CN 112062189 B CN112062189 B CN 112062189B
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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
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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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
Abstract
The invention discloses a multistage multi-heat source evaporation type hot fresh water preparation device, a method and a waste heat recovery system, wherein the multistage multi-heat source evaporation type hot fresh water preparation device comprises the following components: a first heat exchanger; a raw material liquid inlet of the second heat exchanger is communicated with a raw material liquid outlet of the first heat exchanger; a first heat source inlet is arranged on the second heat exchanger or the first heat exchanger; the N-stage evaporator is communicated with the second heat exchanger; a second heat source inlet is formed in the Nth-stage evaporator; and the steam outlet of the M-th stage evaporator is communicated with the heat source inlet of the M-1 stage evaporator. According to the device, heat sources of different grades are fully utilized, the high-grade second heat source is used for driving the highest-grade evaporator, heat of the high-grade second heat source is efficiently used in the fresh water preparation and heating process, the low-grade first heat source is used for preheating the raw material liquid, and waste heat which is difficult to utilize by the low-grade heat source is effectively recovered; the whole process realizes the gradient and efficient utilization of heat with different grades, thereby reducing the operation energy consumption and further reducing the preparation cost of hot and fresh water.
Description
Technical Field
The invention belongs to the technical field of fresh water preparation, and particularly relates to a multistage multi-heat-source evaporative hot fresh water preparation device and method and a waste heat recovery system.
Background
The basic idea is to produce fresh water and heat, namely hot fresh water, simultaneously by a set of preparation devices and convey the fresh water and the heat out by a set of pipe network facilities. The existing heat method seawater desalination technology can only prepare low-temperature fresh water, and a large part of heat of a driving heat source is discharged to the environment along with concentrated waste liquid, so that energy waste is caused. Therefore, how to improve the energy utilization efficiency needs to be considered in the hydrothermal co-production, and the input heat is fully used for increasing the temperature of the fresh water while the fresh water is prepared, so that the operation energy consumption is reduced, and the preparation cost of the hot fresh water is reduced. In addition, the large-scale hydrothermal cogeneration needs to be combined with a power plant to form electricity, heat and water cogeneration, and a driving heat source of the hydrothermal cogeneration device is from a steam turbine. The extracted steam of the steam turbine has higher temperature, is a high-grade heat source and can effectively drive hydrothermal cogeneration, but the exhaust steam temperature of the steam turbine is not high and is often difficult to utilize.
Disclosure of Invention
Objects of the invention
The invention aims to provide a multistage multi-heat-source evaporative hot fresh water preparation device, a method and a waste heat recovery system to solve the problems.
(II) technical scheme
In order to solve the above problems, a first aspect of the present invention provides a multistage and multiple heat source evaporative type hot fresh water preparing apparatus, comprising: a first heat exchanger provided with an external raw material liquid inlet for inputting a raw material liquid; a raw material liquid inlet of the second heat exchanger is communicated with a raw material liquid outlet of the first heat exchanger; a first heat source inlet is arranged on the second heat exchanger or the first heat exchanger and communicated with a heat source inlet of the second heat exchanger or a heat source inlet of the first heat exchanger; a raw material liquid inlet of each stage of evaporator is communicated with a raw material liquid outlet of the second heat exchanger; the Nth-stage evaporator is provided with a second heat source inlet which is communicated with a heat source inlet of the Nth-stage evaporator; a steam outlet of an M-th evaporator in the N-stage evaporators is communicated with a heat source inlet of an M-1-th evaporator; wherein N is more than or equal to M and more than 1, and M and N are integers.
Further, still include: the condensed water inlet of the M-1 stage heater in the N-1 stage heater is communicated with the condensed water outlet of the M-1 stage evaporator; the fresh water inlet of the heater of the M-1 stage is communicated with the fresh water outlet of the heater of the M-2 stage; the steam inlet of the heater of the M-1 stage is communicated with the secondary steam outlet of the evaporator of the M stage; the outlet of the Nth-stage heater is communicated with a heat supply pipe network; wherein N is more than or equal to M and more than 2.
Further, still include: the N-1 stage preheaters are connected in series, and the steam inlet of the M-1 stage preheater in the N-1 stage preheater is communicated with the secondary steam outlet of the M stage evaporator; a condensed water outlet of the M-th stage of the preheater is communicated with a condensed water inlet of the M-th stage of the heater; a raw material liquid inlet of the preheater of the 1 st stage is communicated with the second heat exchanger and a raw material liquid outlet; and a raw material liquid outlet of the M-1 stage preheater is respectively communicated with a raw material liquid inlet of the M stage preheater and a raw material liquid inlet of the M stage evaporator.
Further, in the evaporators of the 2 nd to the Nth stages, the concentrated solution outlet of the evaporator of the Mth stage is communicated with the concentrated solution inlet of the evaporator of the M-1 st stage.
Further, the second heat exchanger comprises a heat source inlet and a heat source outlet, the heat source inlet of the second heat exchanger is communicated with the secondary steam outlet of the 1 st-stage evaporator, and the heat source outlet of the second heat exchanger is communicated with the fresh water inlet of the 1 st-stage heater.
Further, the first heat exchanger comprises a heat source inlet and a heat source outlet, the heat source inlet of the first heat exchanger is communicated with the secondary steam outlet of the first-stage evaporator, and the heat source outlet of the first heat exchanger is communicated with the fresh water inlet of the first-stage heater.
Further, the grade of the first heat source entering the first heat source inlet is lower than the grade of the second heat source entering the second heat source port.
Further, the evaporator includes: the spraying part is communicated with a raw material liquid inlet of the evaporator; a heating part communicating with a heat source inlet of the evaporator; the liquid blocking part is arranged above the spraying part.
According to another aspect of the invention, a method for preparing multistage multiple heat source evaporative hot fresh water is provided, which is characterized in that the hot fresh water is prepared by adopting the multistage multiple heat source evaporative hot fresh water preparation device according to any one of the above schemes; the raw material liquid is at least one of the following components: sea water, river water, lake water, underground water, sewage, wastewater, and reclaimed water.
According to a further aspect of the present invention, there is provided a waste heat recovery system, comprising the multistage multiple heat source evaporative hot fresh water preparation device according to any one of the above aspects, further comprising: a middle-stage steam extraction outlet of the power plant steam turbine is communicated with the second heat source inlet; the steam inlet of the condenser is communicated with the final-stage exhaust steam outlet of the power plant steam turbine; a heating medium water outlet of the condenser is communicated with a first heat source inlet; or a final-stage steam exhaust outlet of the power plant steam turbine is communicated with the first heat source inlet.
(III) advantageous effects
The technical scheme of the invention has the following beneficial technical effects:
according to the device, heat sources of different grades are fully utilized, the high-grade second heat source is used for driving the highest-grade evaporator, the heat of the high-grade second heat source is efficiently used in the fresh water preparation and heating process, the low-grade first heat source is used for preheating the raw material liquid, and waste heat which is usually difficult to utilize for the low-grade heat source is effectively recovered; the whole process realizes the gradient and efficient utilization of heat with different grades, thereby reducing the operation energy consumption and further reducing the preparation cost of hot and fresh water.
Drawings
Fig. 1 is a schematic structural diagram of a multistage multiple heat source evaporative hot fresh water preparation device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a multistage multiple heat source evaporative hot fresh water preparation device according to another embodiment of the invention.
Fig. 3 is a schematic structural view of a multistage multiple heat source evaporative hot fresh water preparing apparatus according to another embodiment of the present invention.
Reference numerals are as follows:
1: an evaporator; 1-1: a heat source inlet; 1-2: a feed solution inlet; 1-3: a secondary steam outlet; 1-4: a condensed water outlet; 1-5: a concentrated solution outlet; 1-6: a concentrated solution inlet;
2: a first heat exchanger; 2-1: a raw material liquid outlet; 2-2: a heat source inlet; 2-3: a heat source outlet; 2-4: a feed solution inlet;
3: a second heat exchanger; 3-1: a heat source inlet; 3-2: a feed solution inlet; 3-3: a raw material liquid outlet; 3-4: a heat source outlet;
4: a heater; 4-1: a steam inlet; 4-2: a condensed water inlet; 4-3: a fresh water inlet; 4-4: a fresh water outlet;
5: a preheater; 5-1: a steam inlet; 5-2: a condensed water outlet; 5-3: a feed solution inlet; 5-4: and a raw material liquid 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.
In the drawings a schematic view of a layer structure according to an embodiment of the invention is shown. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity. The shapes of various regions, layers, 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 a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.
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.
Furthermore, 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 invention 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.
Example 1
Fig. 1 is a schematic structural diagram of a multistage multiple heat source evaporative hot fresh water preparation device according to an embodiment of the present invention.
As shown in fig. 1, this embodiment provides a multistage multiple heat source evaporative hot fresh water preparing apparatus, including: a first heat exchanger 2 provided with an external raw material liquid inlet 2-4 for inputting a raw material liquid;
a raw material liquid inlet 3-2 of the second heat exchanger 3 is communicated with a raw material liquid outlet 2-1 of the first heat exchanger 2; a first heat source inlet is arranged on the second heat exchanger 3 or the first heat exchanger 2 and is communicated with a heat source inlet 3-1 of the second heat exchanger 3 or a heat source inlet 2-2 of the first heat exchanger 2; a raw material liquid inlet 1-2 of each stage of evaporator 1 is communicated with a raw material liquid outlet of the second heat exchanger 3; the Nth-stage evaporator 1 is provided with a second heat source inlet which is communicated with a heat source inlet 1-1 of the Nth-stage evaporator.
A steam outlet 1-3 of an M-th-stage evaporator 1 in the N-stage evaporator 1 is communicated with a heat source inlet 1-1 of the M-1-th-stage evaporator 1; wherein N is more than or equal to M and more than 1, and M and N are integers.
The multistage multiple heat source evaporation type hot fresh water preparation device of the invention can also comprise: a heater 4 of a stage N-1, wherein a condensed water inlet 4-2 of the heater 4 of the stage M-1 in the heater 4 of the stage N-1 is communicated with a condensed water outlet 1-4 of the evaporator 1 of the stage M-1; the fresh water inlet 4-3 of the heater 4 of the M-1 stage is communicated with the fresh water outlet 4-4 of the heater 4 of the M-2 stage;
a steam inlet 4-1 of the heater 4 of the M-1 th stage is communicated with a secondary steam outlet 1-3 of the M-stage evaporator 1; a fresh water outlet of the N-1 th-level heater 4 is communicated with a heat supply pipe network; wherein N is more than or equal to M and more than 2.
The multistage multiple heat source evaporation type hot fresh water preparation device of the invention may further comprise: the N-1 stage preheater 5, the N-1 stages of the preheaters 5 are connected in series, and a steam inlet 5-1 of an M-1 stage preheater 5 in the N-1 stage of the preheaters 5 is communicated with a secondary steam outlet 1-3 of the M stage evaporator 1;
a condensed water outlet 5-2 of the preheater 5 of the Mth stage is communicated with a condensed water inlet 4-2 of the heater 4 of the Mth stage;
a raw material liquid inlet 5-3 of the preheater 5 of the 1 st stage is communicated with the second heat exchanger 3 and a raw material liquid outlet 3-3;
the raw material liquid outlet 5-4 of the preheater 5 of the M-1 th stage is respectively communicated with the raw material liquid inlet 5-3 of the preheater 5 of the M-th stage and the raw material liquid inlet 1-2 of the evaporator 1 of the M-th stage.
In the evaporators 1 from the 2 nd stage to the Nth stage, concentrated solution outlets 1-5 of the evaporators 1 of the M-th stage are communicated with concentrated solution inlets 1-6 of the evaporators 1 of the M-1 st stage.
The evaporator 1 includes: the spraying part is communicated with a raw material liquid inlet 1-2 of the evaporator 1; a heating part communicating with a heat source inlet 1-1 of the evaporator 1; the liquid blocking part is arranged above the spraying part.
Heating steam of the N-th stage evaporator 1 in the N-th stage evaporator 1 comes from high-grade driving steam generated by an external heat source, the high-grade driving steam is condensed in the N-th stage evaporator 1, and the generated condensed water flows out from a condensed water outlet 1-4 and returns to the heat source to regenerate the high-grade driving steam.
In the N-stage evaporator 1, except for the N-stage evaporator 1, heating steam (heat source) of the M-1-stage evaporator 1 comes from secondary steam generated by the M-stage evaporator 1, the heating steam is condensed in the M-1-stage evaporator 1, and the generated condensed water is converged with the condensed water generated by the M-1-stage preheater 5 and enters the M-1-stage heater 4 together.
The secondary steam generated by the evaporator 1 of the nth stage of the evaporators 1 of the N stages comes completely from the evaporation of the raw material liquid.
In the N-stage evaporator 1, except for the Nth-stage evaporator 1, the secondary steam generated by the Mth-stage evaporator 1 comes from raw material liquid evaporation and concentrated liquid flash evaporation, the concentrated liquid flows in from a concentrated liquid inlet 1-6 of the Mth-stage evaporator 1, and the concentrated liquid flash evaporates to generate the secondary steam because the temperature of the concentrated liquid is higher than the saturation temperature corresponding to the working pressure of the Mth-stage evaporator 1.
In each stage of evaporator, secondary steam flows upwards, contacts with sprayed raw material liquid to carry a small amount of tiny liquid drops, and flows out from secondary steam outlets 1-3 after the liquid drops are removed by a liquid blocking device.
In the N-stage evaporator 1, except for the 1 st-stage evaporator 1, the secondary steam generated by the M-stage evaporator 1 is divided into two paths, one path of the secondary steam is used as the driving steam of the M-1 st-stage evaporator 1, the other path of the secondary steam is used for heating the raw material liquid in the M-1 st-stage preheater 5, and the other path of the secondary steam is used for heating the fresh water in the M-1 st-stage heater 4.
The heat source of the first heat exchanger has two alternative sources: when the low-grade driving steam heats the raw material liquid, condensed water generated by steam condensation returns to the heat source to regenerate the low-grade driving steam, and when the low-grade heating medium water heats the raw material liquid, the cooled heating medium water returns to the heat source to be reheated; and the second steam is secondary steam generated by the evaporator 1 of the 1 st stage in the N-stage evaporator, the secondary steam heats the raw material liquid, and condensed water generated by condensation flows into a fresh water inlet 4-3 of the heater of the 1 st stage.
The grade of the first heat source entering the first heat source inlet is lower than the grade of the second heat source entering the second heat source port.
The evaporator 1 may be a dividing wall heat exchanger.
The heater 4 may be a dividing wall type heat exchanger or a direct contact type heat exchanger.
The first heat exchanger 2 may be a dividing wall heat exchanger.
The second heat exchanger 3 may be a dividing wall heat exchanger.
The preheater 5 may be a dividing wall heat exchanger.
The raw material liquid flows into the multistage multi-heat-source evaporative hot fresh water preparation device from the raw material liquid inlet 2-4 of the first heat exchanger 2, is sequentially heated by heat sources in the first heat exchanger 2 and the second heat exchanger 3, flows out from the raw material liquid outlet 3-3 of the second heat exchanger 3, is divided into two paths, and respectively enters the 1 st-stage evaporator 1 and the 1 st-stage preheater 5, and then is divided into two paths at each stage and respectively enters the evaporator 1 and the preheater 5 of the stage.
Raw material liquid flows in from a raw material liquid inlet 1-2 of the evaporator 1, is sprayed by a spraying device, forms a liquid film on the surface of one side of the heating wall, is heated by heating steam on the other side of the heating wall in a dividing wall type heat exchange mode, water in the raw material liquid is evaporated to generate secondary steam, and meanwhile, the raw material liquid is concentrated; in addition, except the nth evaporator 1, the mth evaporator 1 of the N-stage evaporator 1 further comprises a concentrated solution inlet 1-6, the concentrated solution flows in from the concentrated solution inlet 1-6, and the concentrated solution is flashed to generate secondary steam because the temperature of the concentrated solution is higher than the saturation temperature corresponding to the working pressure of the mth evaporator 1; secondary steam generated by evaporation of the raw material liquid and flash evaporation of the concentrated solution flows upwards, contacts with the sprayed raw material liquid to carry a small amount of tiny liquid drops, and flows out from a secondary steam outlet 1-3 after the liquid drops are removed by the liquid blocking device; the condensed heating steam flows out from a condensed water outlet 1-4 after being condensed, the condensed water of the Mth-stage evaporator 1 in the N-stage evaporator 1 except the Nth-stage evaporator 1 is used as fresh water to enter an Mth-stage heater 5 for heating, and the condensed water of the Nth-stage evaporator 1 returns to a heat source to regenerate high-grade driving steam.
In the N-stage evaporator 1, except the 1 st-stage evaporator 1, the secondary steam flowing out of the M-stage evaporator 1 is divided into three paths: the first path enters an M-1 stage evaporator 1 from a heat source inlet 1-1 and is used as heating steam to drive the M-1 stage evaporator 1 to generate secondary steam of the stage; the second path enters an M-1 level preheater 5 from a steam inlet 5-1 to heat the raw material liquid, is condensed, and the generated condensed water flows out from a condensed water outlet 5-2, is converged with the condensed water flowing out from an M-1 level evaporator 1 and enters an M-1 level heater 4 from a condensed water inlet 4-2; the third path enters the M-1 level heater 4 from the steam inlet 4-1 to heat the fresh water, and is condensed at the same time, and the generated condensed water is mixed with the heated fresh water and flows out from the fresh water outlet 4-4.
The fresh water prepared and heated by the device finally flows out from the fresh water outlet 4-4 of the N-1 stage heater 4 and is sent to the heat user and the water user, and the concentrated solution is finally discharged from the concentrated solution outlet 1-5 of the 1 st stage evaporator 1.
According to the multi-heat-source-driven multistage evaporation type hot and fresh water preparation device, heat sources of different grades are fully utilized, the high-grade second heat source is used for driving the highest-grade evaporator, heat of the high-grade second heat source is efficiently used in the fresh water preparation and heating process, the low-grade first heat source is used for preheating the raw material liquid, and waste heat which is difficult to utilize by the low-grade heat source is effectively recovered; the whole process realizes the gradient and efficient utilization of heat of different grades, thereby reducing the operation energy consumption and further reducing the preparation cost of hot fresh water.
Example 2
Fig. 2 is a schematic structural diagram of a multistage multiple heat source evaporative hot fresh water preparation device according to another embodiment of the invention.
As shown in fig. 1, the present embodiment provides a multistage multiple heat source evaporative hot fresh water preparation device, and compared with the second embodiment, the present embodiment is different in that:
and a heat source inlet 3-1 of the second heat exchanger 3 is communicated with a secondary steam outlet 1-3 of the evaporator 1 of the 1 st stage, and a heat source outlet 3-4 of the second heat exchanger 3 is communicated with a fresh water inlet 4-3 of the heater 4 of the 1 st stage.
The heat source of the first heat exchanger 2 is low-grade driving steam or heat medium water generated by an external heat source, the heat source of the second heat exchanger 3 is secondary steam generated by the 1 st stage evaporator 1 in the N stages of evaporators 1, at the moment, the secondary steam heats the raw material liquid, and condensed water generated by condensation flows into a fresh water inlet 4-3 of the 1 st stage heater in the N-1 stages of heaters 4.
A heat source inlet 2-2 of the first heat exchanger 2 is communicated with a low-grade driving steam or heat medium water pipeline, a heat source outlet 2-3 of the first heat exchanger 2 is communicated with a heat source water return pipeline, a heat source inlet 3-1 of the second heat exchanger 3 is communicated with a secondary steam outlet 1-3 of the 1 st-stage evaporator 1, and a heat source outlet 3-4 of the second heat exchanger 3 is communicated with a fresh water inlet 4-3 of the 1 st-stage heater 4.
In this embodiment, the low-grade driving steam or heat medium water is lower in temperature than the secondary steam generated by the 1 st stage evaporator 1, and therefore the heating sequence of the low-grade driving steam or heat medium water precedes the secondary steam generated by the 1 st stage evaporator 1.
Raw material liquid flows into the device from a raw material liquid inlet 2-4 of the first heat exchanger 2 and is heated by low-grade driving steam or heat medium water, when the raw material liquid is heated by the low-grade driving steam, condensed water generated by steam condensation returns to a heat source to regenerate the low-grade driving steam, and when the raw material liquid is heated by the low-grade heat medium water, the heat medium water after temperature reduction returns to the heat source to be heated again; after flowing out of the first heat exchanger 2, the raw material liquid is continuously heated in the second heat exchanger 3 by secondary steam from the 1 st-stage evaporator 1, and condensed water generated by steam condensation enters a fresh water inlet 4-3 of the 1 st-stage heater 4.
Example 3
Fig. 3 is a schematic structural diagram of a multistage multiple heat source evaporative hot fresh water preparation device according to another embodiment of the invention.
As shown in fig. 1, the present embodiment provides a multistage multiple heat source evaporative hot fresh water preparation device, and compared with the second embodiment, the present embodiment is different in that: and a heat source inlet 2-2 of the first heat exchanger 2 is communicated with a secondary steam outlet 1-3 of the evaporator 1 of the 1 st stage, and a heat source outlet of the first heat exchanger 2 is communicated with a fresh water inlet 4-3 of the heater 4 of the 1 st stage.
The heat source of the first heat exchanger 2 is from the secondary steam generated by the evaporator 1 of the 1 st stage in the N stages of evaporators 1, the heat source of the second heat exchanger 3 is from the low-grade driving steam or heat medium water generated by an external heat source, at the moment, when the raw material liquid is heated by the low-grade driving steam, the condensed water generated by condensation returns to the heat source to regenerate the low-grade driving steam, and when the raw material liquid is heated by the low-grade heat medium water, the heat medium water after temperature reduction returns to the heat source to be reheated.
A heat source inlet 3-1 of the second heat exchanger 3 is communicated with a low-grade driving steam or heat medium water pipeline, a heat source outlet 3-4 of the second heat exchanger 3 is communicated with a heat source water return pipeline, a heat source inlet 2-2 of the first heat exchanger 2 is communicated with a secondary steam outlet 1-3 of the 1 st-stage evaporator 1, and a heat source outlet 2-3 of the first heat exchanger 2 is communicated with a fresh water inlet 4-3 of the 1 st-stage heater 4.
In the present embodiment, the temperature of the low-grade drive steam is higher than the temperature of the secondary steam generated by the 1 st stage evaporator 1, and therefore the heating sequence of the low-grade drive steam follows the secondary steam generated by the 1 st stage evaporator 1.
Raw material liquid flows into the device from a raw material liquid inlet 2-4 of a first heat exchanger 2, is heated by secondary steam from a stage 1 evaporator 1, and condensed water generated by steam condensation enters a fresh water inlet 4-3 of a stage 1 heater 4; after flowing out of the first heat exchanger 2, the raw material liquid is continuously heated by low-grade driving steam or heat medium water in the second heat exchanger 3, when the raw material liquid is heated by the low-grade driving steam, condensed water generated by steam condensation returns to a heat source to regenerate the low-grade driving steam, and when the raw material liquid is heated by the low-grade heat medium water, the heat medium water after temperature reduction returns to the heat source to be reheated.
Example 4
The embodiment provides a method for preparing multistage multi-heat-source evaporative hot fresh water, which is characterized in that the multistage multi-heat-source evaporative hot fresh water preparation device described in any one of the embodiments 1 to 3 is adopted to prepare hot fresh water; the raw material liquid is at least one of the following materials: sea water, river water, lake water, groundwater, sewage, wastewater, and reclaimed water.
Example 5
The present embodiment provides a waste heat recovery system, including the multistage multiple heat source evaporative hot fresh water preparation apparatus according to any one of embodiments 1 to 3, further including:
a middle-stage steam extraction outlet of the power plant steam turbine is communicated with the second heat source inlet;
the condenser comprises a steam inlet, a steam outlet, a heat medium water inlet and a heat medium water outlet; a steam inlet of the condenser is communicated with a final-stage exhaust steam outlet of a steam turbine of the power plant; and a heat medium water outlet of the condenser is communicated with the first heat source inlet.
The grade of the steam discharged from the intermediate stage steam extraction outlet of the power plant steam turbine is higher than that of the steam discharged from the final stage exhaust steam outlet of the power plant steam turbine.
Steam discharged from a final-stage exhaust steam outlet of a power plant steam turbine enters a condenser through a steam inlet to heat hot medium water in the condenser; the hot media water enters the condenser through the hot media water inlet, is heated by steam discharged from a final-stage exhaust steam outlet of a steam turbine of the power plant, and enters the first heat source inlet after being discharged from the hot media water outlet. The device is driven by heat sources with different grades, and is characterized in that the heat sources have different temperatures, high-grade driving steam is used for driving the Nth-stage evaporator 1, and low-grade driving steam or circulating water is used for heating the first heat exchanger 2 or the second heat exchanger 3.
Example 6
The present embodiment provides a waste heat recovery system, including the multistage multiple heat source evaporative hot fresh water preparation apparatus according to any one of embodiments 1 to 3, further including:
a middle-stage steam extraction outlet of the power plant steam turbine is communicated with the second heat source inlet; and a final-stage dead steam outlet of the power plant steam turbine is communicated with the first heat source inlet. The grade of the steam discharged from the intermediate stage steam extraction outlet of the power plant steam turbine is higher than that of the steam discharged from the final stage dead steam outlet of the power plant steam turbine.
The device is driven by heat sources with different grades, and is characterized in that the heat sources have different temperatures, high-grade driving steam is used for driving the Nth-stage evaporator 1, and low-grade driving steam or heat medium water is used for heating the first heat exchanger 2 or the second heat exchanger 3.
It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. 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 multistage multiple heat source evaporation type hot fresh water preparation device is characterized by comprising:
a first heat exchanger (2) provided with a raw material liquid inlet (2-4) for inputting a raw material liquid;
a second heat exchanger (3), wherein a raw material liquid inlet (3-2) of the second heat exchanger (3) is communicated with a raw material liquid outlet (2-1) of the first heat exchanger (2); a first heat source inlet is arranged on the second heat exchanger (3) or the first heat exchanger (2), and the first heat source inlet is communicated with a heat source inlet (3-1) of the second heat exchanger (3) or a heat source inlet (2-2) of the first heat exchanger (2);
n stages of evaporators (1), wherein a raw material liquid inlet (1-2) of each stage of evaporator (1) is communicated with a raw material liquid outlet of the second heat exchanger (3); a second heat source inlet is arranged on the Nth-stage evaporator (1), and the second heat source inlet is communicated with a heat source inlet (1-1) of the Nth-stage evaporator; a steam outlet (1-3) of an Mth-stage evaporator (1) in the N-stage evaporator (1) is communicated with a heat source inlet (1-1) of the Mth-1-stage evaporator (1); wherein N is more than or equal to M and more than 1, and M and N are integers;
the N-1 stage heater (4), wherein a condensed water inlet (4-2) of an M-1 stage heater (4) in the N-1 stage heater (4) is communicated with a condensed water outlet (1-4) of the M-1 stage evaporator (1); a fresh water inlet (4-3) of the heater (4) of the M-1 th stage is communicated with a fresh water outlet (4-4) of the heater (4) of the M-2 th stage;
a steam inlet (4-1) of the heater (4) of the M-1 th stage is communicated with a secondary steam outlet (1-3) of the evaporator (1) of the M-1 th stage; a fresh water outlet of the N-1 th-level heater (4) is communicated with a heat supply pipe network;
wherein N is more than or equal to M and more than 2.
2. The evaporative hot fresh water producing device with multiple stages and multiple heat sources as claimed in claim 1, further comprising:
the N-1 stage preheaters (5), the N-1 stage preheaters (5) are connected in series, and a steam inlet (5-1) of an M-1 stage preheater (5) in the N-1 stage preheater (5) is communicated with a secondary steam outlet (1-3) of the M stage evaporator (1);
a condensed water outlet (5-2) of the M-th stage of the preheater (5) is communicated with a condensed water inlet (4-2) of the M-th stage of the heater (4);
a raw material liquid inlet (5-3) of the preheater (5) of the 1 st stage is communicated with a raw material liquid outlet (3-3) of the second heat exchanger (3);
and a raw material liquid outlet (5-4) of the preheater (5) of the M-1 th stage is respectively communicated with a raw material liquid inlet (5-3) of the preheater (5) of the M-th stage and a raw material liquid inlet (1-2) of the evaporator (1) of the M-th stage.
3. The multistage multiple heat source evaporative hot fresh water producing device as claimed in claim 1,
in the evaporators (1) of the 2 nd to the Nth stages, the concentrated solution outlet (1-5) of the evaporator (1) of the Mth stage is communicated with the concentrated solution inlet (1-6) of the evaporator (1) of the M-1 th stage.
4. The multistage multiple heat source evaporative hot fresh water producing device according to claim 2,
a heat source inlet (3-1) of the second heat exchanger (3) is communicated with a secondary steam outlet (1-3) of the evaporator (1) of the 1 st stage, and a heat source outlet (3-4) of the second heat exchanger (3) is communicated with a fresh water inlet (4-3) of the heater (4) of the 1 st stage.
5. The multistage multiple heat source evaporative hot fresh water producing device according to claim 2,
a heat source inlet (2-2) of the first heat exchanger (2) is communicated with a secondary steam outlet (1-3) of the first-stage evaporator (1), and a heat source outlet (2-3) of the first heat exchanger (2) is communicated with a fresh water inlet (4-3) of the first-stage heater (4).
6. The multistage multiple heat source evaporative hot fresh water producing device as claimed in claim 1,
the grade of a first heat source entering the first heat source inlet is lower than the grade of a second heat source entering the second heat source port.
7. A multistage, multiple-heat-source, evaporative, hot fresh water production device according to any of claims 1 to 6, wherein the evaporator (1) comprises:
the spraying part is communicated with a raw material liquid inlet (1-2) of the evaporator (1);
a heating part which is communicated with a heat source inlet (1-1) of the evaporator (1);
the liquid blocking part is arranged above the spraying part.
8. A method for preparing multistage multiple heat source evaporative hot fresh water, which is characterized in that the hot fresh water is prepared by adopting the multistage multiple heat source evaporative hot fresh water preparation device as claimed in any one of claims 1 to 7;
the raw material liquid is at least one of the following materials: sea water, river water, lake water, groundwater, sewage, wastewater, and reclaimed water.
9. A waste heat recovery system comprising a multistage multiple heat source evaporative hot fresh water producing apparatus according to any one of claims 1 to 7, comprising:
a middle-stage steam extraction outlet of the power plant steam turbine is communicated with the second heat source inlet;
the steam inlet of the condenser is communicated with the final-stage exhaust steam outlet of the power plant steam turbine; a heating medium water outlet of the condenser is communicated with a first heat source inlet; or a final-stage steam exhaust outlet of the power plant steam turbine is communicated with the first heat source inlet.
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| CN202010797144.XA Active CN112062187B (en) | 2020-06-05 | 2020-08-10 | Preparation device and preparation method of hot distilled water |
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| CN202010814598.3A Active CN112062188B (en) | 2020-06-05 | 2020-08-13 | Multi-heat source hot distilled water preparation device, system and method |
| CN202010815755.2A Active CN112062189B (en) | 2020-06-05 | 2020-08-14 | Multistage multi-heat-source evaporation type hot fresh water preparation device and method and waste heat recovery system |
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| CN116284209B (en) * | 2023-04-23 | 2023-10-03 | 宁安市粮油淀粉机械制造有限公司 | Complete equipment for extracting soluble proteins of potatoes |
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Also Published As
| Publication number | Publication date |
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| CN112062374A (en) | 2020-12-11 |
| CN112062189A (en) | 2020-12-11 |
| CN112062188A (en) | 2020-12-11 |
| CN213357008U (en) | 2021-06-04 |
| CN212269517U (en) | 2021-01-01 |
| CN112062187A (en) | 2020-12-11 |
| CN112062188B (en) | 2023-06-20 |
| CN112062187B (en) | 2022-06-24 |
| CN112010379A (en) | 2020-12-01 |
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