Evaporation and condensation skid-mounted isenthalpy energy-saving device

Abstract

The invention discloses an evaporation, cooling and condensation skid-mounted isenthalpy energy-saving device which comprises a raw material liquid feeding system, a preheating system, a separation tower system, a first-stage isenthalpy evaporation and condensation integrated system, a second-stage isenthalpy condensation and preheating integrated system and a recovery system. The separation tower system comprises a circulating pump, a separation tower and a tower bottom liquid discharge valve; the first-stage isenthalpy evaporation and condensation integrated system comprises an asymmetric runner plate type reboiler, a condenser I and a throttling device I; the second-stage isenthalpy condensation and preheating integrated system comprises a finished product tank, a condenser II, a compressor II, a condensation type preheater and a throttling device II; the raw material liquid feeding system comprises a raw material tank, a raw material pump and a steam auxiliary preheater. The evaporation and condensation skid-mounted isenthalpy energy-saving device provided by the invention has the effects of internal circulation and energy loss reduction.

Description

Technical Field

[0001] The present invention belongs to the technical field of evaporation, condensation and material purification energy saving, and more specifically, relates to an evaporation and condensation skid-mounted isenthalpic energy-saving device. Background Art

[0002] In the pharmaceutical, chemical, electronic and other industries, there are a large number of different component separation processes such as distillation, rectification, and flash evaporation. Distillation is a thermodynamic separation process that uses the different boiling points of the components in a mixed liquid or liquid-solid system to evaporate the low-boiling-point component and then condense it to separate the entire component. It is a unit operation process that combines the two unit operations of evaporation and condensation. Flash evaporation is the phenomenon that after a high-pressure saturated liquid enters a relatively low-pressure container, due to the sudden drop in pressure, these saturated liquids become saturated vapor and saturated liquid under a portion of the container pressure.

[0003] For the above-mentioned processes of separating different components such as distillation, rectification, and flash evaporation, steam is used for heating the bottom of the tower and cooling the steam at the top of the tower with cooling water / chilled water.

[0004] Because heating and cooling at the tower bottom and top are independent and because heating and cooling are opposite heat exchange processes, there is heat and energy loss, resulting in significant energy consumption. The lowest temperature of the tower bottom heating is close to the overflow temperature of the tower bottom steam, while the temperature of the tower top steam after overflow cooling is lower than the lowest temperature of the tower bottom heating. Furthermore, the inventors believe that the abutment between the heat absorption and heat release tubes in existing heat exchange devices results in poor heat exchange efficiency. Therefore, it is urgent to design an evaporation-condensation skid-mounted isenthalpic energy-saving device to solve the above problems. Summary of the Invention

[0005] One object of the present invention is to provide an evaporation-condensation skid-mounted isenthalpic energy-saving device capable of internal circulation and saving energy loss.

[0006] In view of the shortcomings of the prior art, the object of the present invention is to provide an evaporation-condensation skid-mounted isenthalpic energy-saving device.

[0007] In order to achieve the above-mentioned invention object, the technical scheme adopted by the present invention includes a raw material liquid feeding system, a preheating system, a separation tower system, a first-level isenthalpic evaporation and condensation integrated system, a second-level isenthalpic condensation and preheating integrated system and a recovery system; the separation tower system includes a circulation pump, a separation tower and a bottom liquid discharge valve; the first-level isenthalpic evaporation and condensation integrated system includes an asymmetric flow channel plate reboiler, a condenser and a throttling device; the second-level isenthalpic condensation and preheating integrated system includes a finished product tank, a condenser second, a compressor second, a condensing preheater and a throttling device second; the raw material liquid feeding system includes a raw material tank, a raw material pump and a steam auxiliary preheater; the asymmetric flow channel plate reboiler includes a multi-layer plate structure, a multi-layer plate structure, a multi-layer plate structure, a multi-layer plate structure, a multi-layer plate structure, a multi-layer plate structure, a multi-layer plate structure, a multi-layer plate structure, a multi-layer plate structure, a multi-layer plate structure, a multi-layer plate structure, a multi-layer plate structure, a The plate-like structures are arranged in an array and abut against each other; the plate-like structure includes channel A and channel B; evaporating liquid circulates in channel A, and refrigerant is provided in channel B; channel A and channel B are cross-arranged along the length direction of the plate-like structure; channel B includes two turbulent parts and a cooling part; flat parts are provided at both ends of the cooling part; the cooling part is provided between two connected channel A, and the outer wall of the cooling part abuts against the two channel A, and two adjacent channel A are located on the same side of the cooling part; the two turbulent parts are respectively provided on both sides of the cooling part, and the two turbulent parts and the cooling part are on the same axis; an abutting part is provided at the position of channel A corresponding to the turbulent part; channel A and the turbulent part abut against each other.

[0008] Optionally, the side length of the cooling part is equal to the side length of the abutment surface of channel A; the line connecting the midpoints of the two flat parts is parallel to the diagonal line of the turbulent part, and the ratio of the line connecting the midpoints of the two flat parts to the parallel diagonal line of the turbulent part is 1:2; the extension line of the other diagonal line of the turbulent part divides the cooling part into two halves.

[0009] Optionally, the A channel has a large flow channel design: the flow resistance of the gas-liquid mixture is reduced, and the pressure drop ΔP≤0.03MPa; the B channel has a narrow flow channel turbulence: the flow channel height is half of the A channel, the refrigerant flow rate is increased, and the heat transfer is enhanced while maintaining ΔP≤0.08MPa.

[0010] Optionally, two turbulent portions are provided between a plurality of A channels in the same plane of the multi-layer plate structure; and the contact area between the A channels and the B channels that are not located at the edge of the multi-layer plate structure can reach 95% of the area.

[0011] Optionally, a connecting pipe is provided between the separation tower and the circulation pump; a connecting pipe is provided between the separation tower and the bottom liquid discharge valve; a connecting pipe is provided between the separation tower and condenser 1; and a connecting pipe is provided between the separation tower and the condensing preheater.

[0012] Optionally, a connecting pipe is provided between the asymmetric flow channel plate reboiler and the circulation pump; a connecting pipe is provided between the asymmetric flow channel plate reboiler and the separation tower; a connecting pipe is provided between the asymmetric flow channel plate reboiler and compressor one; a connecting pipe is provided between the asymmetric flow channel plate reboiler and throttling device one; a connecting pipe is provided between throttling device one and condenser one; and a connecting pipe is provided between compressor one and condenser one.

[0013] Optionally, a connecting pipe is provided between the finished product tank and condenser 1; a connecting pipe is provided between condenser 2 and condenser 1; a connecting pipe is provided between the finished product tank and condenser 2, and a connecting pipe is provided between condenser 2 and compressor 2; a connecting pipe is provided between compressor 2 and the condensing preheater; a connecting pipe is provided between the condensing preheater, condenser 2, the condensing preheater and throttling device 2.

[0014] Optionally, the output end of the raw material tank is connected to the raw material pump through a pipeline, and the raw material pump is connected to the steam-assisted preheater through a pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A system flow chart is provided for an embodiment of an evaporation-condensation skid-mounted isenthalpic energy-saving device according to the present invention; Figure 2 A schematic diagram of the structure of an asymmetric flow channel plate reboiler provided for an embodiment of an evaporation-condensation skid-mounted isenthalpic energy-saving device according to the present invention; Reference numerals: E-1, circulating pump; E-2, asymmetric flow plate reboiler; E-3, separation tower; E-4, raw material tank; E-5, compressor 1; E-6, condenser 1; E-7, finished product tank; E-8, condenser 2; E-9, compressor 2; E-10, condensing preheater; E-11, raw material pump; E-12, steam-assisted preheater; P, connecting pipes; V-1, throttling device 1; V-2, throttling device 2; V-3, tower bottom liquid discharge valve; F-1, turbulent section; F-2, cooling section; F-3, leveling section; In the drawings, the same components are denoted by the same reference numerals; the drawings are not drawn to scale. DETAILED DESCRIPTION

[0017] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principles, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0018] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, the present invention covers any substitution, modification, equivalent method and scheme made within the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] In the description of this application, "first", "second", "third" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "a" or "an" and other similar words do not indicate a quantity limitation, but rather indicate the existence of at least one. "Include" or "comprising" and other similar words mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0020] In the description of this application, the terms "center," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this application. Furthermore, when positional terms such as "both sides," "outside," "upper," and "lower" are used, they should be understood to be used solely to facilitate understanding and description, taking into account that the structure may be oriented in other directions.

[0021] In the description of this application, unless otherwise clearly specified and limited, the technical or scientific terms used should have the usual meanings understood by persons with ordinary skills in the field to which this application belongs. Terms such as "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection, or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] The embodiment of the present invention is intended to introduce and illustrate the structural composition of the evaporation-condensation skid-mounted isenthalpic energy-saving device and the coordination relationship between the various components. Unless otherwise specified, the dimensions, materials and manufacturing processes of the various components in the evaporation-condensation skid-mounted isenthalpic energy-saving device in the embodiment of the present invention can be selected according to specific circumstances and are not specifically limited or explained here.

[0023] Furthermore, in order to provide the public with a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0024] Example 1 See also Figure 1 and Figure 2 , an evaporation-condensation skid-mounted isenthalpic energy-saving device, including a raw material liquid feeding system, a preheating system, a separation tower system, a first-stage isenthalpic evaporation-condensation integrated system, a second-stage isenthalpic condensation-preheating integrated system and a recovery system.

[0025] See also Figure 1 and Figure 2 The separation tower system includes a circulation pump E-1, a separation tower E-3 and a bottom liquid discharge valve V-3; a connecting pipe P-1 is provided between the separation tower E-3 and the circulation pump E-1; a connecting pipe P-21 is provided between the separation tower E-3 and the bottom liquid discharge valve V-3; a connecting pipe P-3 is provided between the separation tower E-3 and the condenser E-6; and a connecting pipe P-18 is provided between the separation tower E-3 and the condensing preheater E-10.

[0026] See also Figure 1 and Figure 2 The one-stage isenthalpic evaporation and condensation integrated system includes an asymmetric flow channel plate reboiler compressor E-2, a condenser E-6 and a throttling device V-1; In the first-stage isenthalpic evaporation and condensation integrated system, a connecting pipe P-20 is provided between the asymmetric flow channel plate reboiler E-2 and the circulation pump E-1; a connecting pipe P-2 is provided between the asymmetric flow channel plate reboiler E-2 and the separation tower E-3; a connecting pipe P-5 is provided between the asymmetric flow channel plate reboiler E-2 and the compressor E-5; a connecting pipe P-6 is provided between the asymmetric flow channel plate reboiler E-2 and the throttling device V-1; a connecting pipe P-7 is provided between the throttling device V-1 and the condenser E-6; and a connecting pipe P-8 is provided between the compressor E-5 and the condenser E-6.

[0027] See also Figure 1 and Figure 2, the two-stage isenthalpic condensation and preheating integrated system includes the finished product tank E-7, the second condenser E-8, the second compressor E-9, the condensing preheater E-10 and the second throttling device V-2; A connecting pipe P-9 is provided between the finished product tank E-7 and the condenser 1 E-6; a connecting pipe P-10 is provided between the condenser 2 E-8 and the condenser 1 E-6; a connecting pipe P-11 is provided between the finished product tank E-7 and the condenser 2 E-8; a connecting pipe P-13 is provided between the condenser 2 E-8 and the compressor 2 E-9; a connecting pipe P-14 is provided between the compressor 2 E-9 and the condensing preheater E-10; a connecting pipe P-16 is provided between the throttling device 2 V-2 and the condenser 2 E-8, and a connecting pipe P-15 is provided between the condensing preheater E-10 and the throttling device 2 V-2.

[0028] See also Figure 1 and Figure 2 The raw material liquid feeding system includes a raw material tank E-4, a raw material pump E-11 and a steam-assisted preheater E-12; the output end of the raw material tank E-4 is connected to the raw material pump E-11 through a pipeline P-19, and the raw material pump E-11 is connected to the steam-assisted preheater E-12 through a pipeline P-17.

[0029] See also Figure 1 and Figure 2 The asymmetric channel plate reboiler E-2 includes a multi-layer plate structure, which is arranged in an array and abuts against each other; the plate structure includes channel A and channel B; evaporating liquid flows in channel A, and refrigerant is set in channel B; channels A and B are arranged crosswise along the length direction of the plate structure; Channel B includes two turbulent sections F-1 and a cooling section F-2; the cooling section F-2 is disposed between two connected Channel A sections, and the outer wall of the cooling section F-2 abuts against the two Channel A sections, with two adjacent Channel A sections located on the same side of the cooling section F-2; the two turbulent sections F-1 are disposed on either side of the cooling section F-2, with the two turbulent sections F-1 and the cooling section F-2 being coaxial; an abutting section (not shown) is provided at the position of Channel A corresponding to the turbulent section F-1; Channel A abuts against the turbulent section F-1; Flat parts F-3 are provided at both ends of the cooling part F-2; the line connecting the midpoints of the two flat parts F-3 is parallel to the diagonal line of the turbulent part F-1, and the ratio of the line connecting the midpoints of the two flat parts F-3 to the parallel diagonal line of the turbulent part F-1 is 1:2; the extension line of the other diagonal line of the turbulent part F-1 divides the cooling part F-2 into two halves; the extension lines of the outer walls of the cooling part F-2 and the channel A on the same side that are in contact with each other can intersect at one point, and the formed figure is a diamond shape.

[0030] The multi-layer plate structure is arranged in an array, and the cooling part F-2 is in contact with multiple adjacent A channels. Except for the flat part F-3, the cooling part F-2 is in contact with the A channel, and the side length of the cooling part F-2 is equal to the side length of the contact surface of the A channel; the turbulent part F-1 is in contact with adjacent A channels; two turbulent parts F-1 are arranged between multiple A channels in the same plane of the multi-layer plate structure; the contact area between the A channel and the B channel that is not located at the edge of the multi-layer plate structure can reach more than 95% of the area.

[0031] Asymmetric channel plate reboiler E-2 effect: 1. Enhanced heat transfer efficiency: The turbulent section F-1 and the cooling section F-2 work together: The turbulent section F-1 is set in the B channel, and the fluid is deflected in the turbulent section F-1 to form a high turbulence intensity (Re ≥ 15,000); the contact area is optimized: the abutment area of ​​the A / B channels is ≥ 95%, which increases the effective heat transfer area.

[0032] 2. Pressure drop and flow optimization; A channel large flow channel design: the flow resistance of gas-liquid mixture is reduced, and the pressure drop ΔP ≤ 0.03MPa.

[0033] Turbulent flow in narrow channel B: The channel height is half of that in channel A, which increases the refrigerant flow rate and enhances heat transfer while maintaining ΔP ≤ 0.08 MPa.

[0034] 3. Thermal stress and structural stability: The cooling section F-2 has a diamond-like layout; the flattened section F-3 abuts against channel A to disperse thermal stress, reducing the maximum stress concentration factor to 1.8; the multi-layer board array layout optimizes board spacing to 8-12mm to control thermal deformation.

[0035] When using, check the equipment connections: confirm that all pipes (P-1 to P-21) and valves (V-1 to V-3) are correctly connected and there are no leaks; ensure that the transmission equipment such as the circulation pump (E-1, E-11) and compressor (E-5, E-9) are adequately lubricated, and that the instrument calibration is complete.

[0036] Start the raw material pump E-11 and transport the raw material liquid from the raw material tank E-4 to the steam auxiliary preheater E-12 through the pipeline P-19.

[0037] The steam-assisted preheater E-12 is turned on, using external steam to heat the raw liquid to a partially vaporized state. When the temperature at the top of the separation tower E-3 reaches the preset threshold, the steam-assisted preheater E-12 is turned off, and the system switches to isenthalpic operation.

[0038] In the operation of the first-stage isenthalpic evaporation and condensation integrated system, the steam path is: the steam from the top of the separation tower E-3 enters the condenser E-6 along the pipeline P-3, and after condensing into liquid, it enters the finished product tank E-7 through the pipeline P-9; The latent heat released during the condensation process is absorbed by the refrigerant, which is compressed into a high-temperature gas by the compressor E-5 and enters the asymmetric flow plate reboiler E-2; Reboiling process: The high-temperature coolant flows in the asymmetric channel B, heating the mixed liquid (channel A) pumped in by the circulation pump E-1, causing it to partially vaporize. The vaporized steam returns to the separation tower E-3 through the pipeline P-2, completing the cycle. Refrigerant circulation: After the refrigerant is condensed in the asymmetric flow plate reboiler E-2, it is depressurized by the throttling device V-1 and returns to the condenser E-6 to complete the closed cycle.

[0039] During the operation of the two-stage isenthalpic condensation and preheating integrated system, uncondensed gas treatment is as follows: the incompletely condensed gas in condenser 1 E-6 enters condenser 2 E-8 along pipeline P-10, is condensed into liquid and enters the finished product tank E-7; secondary heat recovery: the heat released by condenser 2 E-8 is absorbed by the refrigerant, compressed into a high-temperature gas by compressor 2 E-9, and enters the condensing preheater E-10; raw liquid preheating: the high-temperature refrigerant exchanges heat with the raw liquid in the condensing preheater E-10, and after condensation, the refrigerant is reduced in pressure by throttling device 2 V-2 and returns to condenser 2 E-8.

[0040] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make some simple deductions or substitutions without departing from the concept of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An evaporation-condensation skid-mounted isenthalpic energy-saving device, characterized by: An evaporation-condensation skid-mounted isenthalpic energy-saving device, comprising a raw material liquid feeding system, a preheating system, a separation tower system, a first-stage isenthalpic evaporation-condensation integrated system, a second-stage isenthalpic condensation-preheating integrated system, and a recovery system; The separation tower (E-3) system includes a circulation pump (E-1), a separation tower (E-3) and a bottom liquid discharge valve (V-3); The one-stage isenthalpic evaporation and condensation integrated system includes an asymmetric flow channel plate reboiler (E-2), a condenser (E-6) and a throttling device (V-1); The two-stage isenthalpic condensation and preheating integrated system includes the finished product tank (E-7), condenser 2 (E-8), compressor 2 (E-9), condensing preheater (E-10) and throttling device 2 (V-2); The raw material liquid feeding system includes a raw material tank (E-4), a raw material pump (E-11) and a steam auxiliary preheater (E-12); The asymmetric channel plate reboiler (E-2) comprises a multi-layer plate structure, wherein the multi-layer plate structures are arranged in an array and abut against each other; the plate structure comprises channel A and channel B; channel A flows through evaporating liquid, and channel B is provided with refrigerant; channels A and B are arranged crosswise along the length direction of the plate structure; Channel B includes two turbulent sections (F-1) and a cooling section (F-2); flat sections (F-3) are provided at both ends of the cooling section (F-2); the cooling section (F-2) is arranged between the two connected A channels, and the outer wall of the cooling section (F-2) abuts against the two A channels, and two adjacent A channels are located on the same side of the cooling section (F-2); the two turbulent sections (F-1) are respectively arranged on both sides of the cooling section (F-2), and the two turbulent sections (F-1) and the cooling section (F-2) are on the same axis; an abutting section is opened at the position of the A channel corresponding to the turbulent section (F-1); the A channel and the turbulent section (F-1) abut against each other.

2. The evaporation-condensation skid-mounted isenthalpic energy-saving device according to claim 1, characterized in that: The side length of the cooling portion (F-2) is equal to the side length of the abutting surface of channel A; the line connecting the midpoints of the two flat portions (F-3) is parallel to the diagonal line of the turbulent portion (F-1), and the ratio of the line connecting the midpoints of the two flat portions (F-3) to the parallel diagonal line of the turbulent portion (F-1) is 1:2; the extension line of the other diagonal line of the turbulent portion (F-1) bisects the cooling portion (F-2).

3. The evaporation-condensation skid-mounted isenthalpic energy-saving device according to claim 1, characterized in that: A channel large flow channel design: the flow resistance of gas-liquid mixture is reduced, and the pressure drop ΔP≤0.03MPa; Turbulent flow in narrow channel B: The channel height is half of that in channel A, which increases the refrigerant flow rate and enhances heat transfer while maintaining ΔP ≤ 0.08 MPa.

4. The evaporation-condensation skid-mounted isenthalpic energy-saving device according to claim 1, characterized in that: Two turbulent parts (F-1) are provided between multiple A channels in the same plane of the multilayer plate structure; the contact area between the A channel and the B channel that are not located at the edge of the multilayer plate structure can reach 95% of the area.

5. The evaporation-condensation skid-mounted isenthalpic energy-saving device according to claim 1, characterized in that: A connecting pipe (P-1) is provided between the separation tower (E-3) and the circulation pump (E-1); a connecting pipe (P-21) is provided between the separation tower (E-3) and the bottom liquid discharge valve (V-3); a connecting pipe (P-3) is provided between the separation tower (E-3) and the condenser (E-6); and a connecting pipe (P-18) is provided between the separation tower (E-3) and the condensing preheater (E-10).

6. The evaporation-condensation skid-mounted isenthalpic energy-saving device according to claim 1, characterized in that: A connecting pipe (P-20) is provided between the asymmetric flow channel plate reboiler (E-2) and the circulation pump (E-1); a connecting pipe (P-2) is provided between the asymmetric flow channel plate reboiler (E-2) and the separation tower (E-3); a connecting pipe (P-5) is provided between the asymmetric flow channel plate reboiler (E-2) and compressor 1 (E-5); a connecting pipe (P-6) is provided between the asymmetric flow channel plate reboiler (E-2) and throttling device 1 (V-1); a connecting pipe (P-7) is provided between throttling device 1 (V-1) and condenser 1 (E-6); and a connecting pipe (P-8) is provided between compressor 1 (E-5) and condenser 1 (E-6).

7. The evaporation-condensation skid-mounted isenthalpic energy-saving device according to claim 1, characterized in that: A connecting pipe (P-9) is provided between the finished product tank (E-7) and condenser 1 (E-6); a connecting pipe (P-10) is provided between condenser 2 (E-8) and condenser 1 (E-6); a connecting pipe (P-11) is provided between the finished product tank (E-7) and condenser 2 (E-8), and a connecting pipe (P-13) is provided between condenser 2 (E-8) and compressor 2 (E-9); a connecting pipe (P-14) is provided between compressor 2 (E-9) and condensing preheater (E-10); a connecting pipe (P-16) is provided between throttling device 2 (V-2) and condenser 2 (E-8), and a connecting pipe (P-15) is provided between condensing preheater (E-10) and throttling device 2 (V-2).

8. The evaporation-condensation skid-mounted isenthalpic energy-saving device according to claim 1, characterized in that: The output end of the raw material tank (E-4) is connected to the raw material pump (E-11) through a pipeline (P-19), and the raw material pump (E-11) is connected to the steam auxiliary preheater (E-12) through a pipeline (P-17).

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