Evaporative condensation skid-mounted isenthalpic energy-saving device

Abstract

This invention discloses an evaporative cooling and condensing skid-mounted isenthalpic energy-saving device, comprising a feed system, a preheating system, a separation tower system, a primary isenthalpic evaporative cooling and condensing integrated system, a secondary isenthalpic cooling and preheating integrated system, and a recovery system. The separation tower system includes a circulating pump, a separation tower, and a bottom liquid discharge valve. The primary isenthalpic evaporative cooling and condensing integrated system includes an asymmetric flow channel plate reboiler, a first condenser, and a first throttling device. The secondary isenthalpic cooling and preheating integrated system includes a finished product tank, a second condenser, a second compressor, a condensing preheater, and a second throttling device. The feed system includes a feed tank, a feed pump, and a steam auxiliary preheater. This invention provides an evaporative cooling and condensing skid-mounted isenthalpic energy-saving device with internal circulation, achieving energy savings.

Description

Technical Field

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

[0002] In industries such as pharmaceuticals, chemicals, and electronics, there are numerous processes for separating different components, including distillation, rectification, and flash evaporation. Distillation is a thermodynamic separation process that utilizes the different boiling points of components in a mixed liquid or liquid-solid system to evaporate the lower-boiling-point components and then condense them to separate the entire component. It is a unit operation that combines evaporation and condensation. Flash evaporation is the phenomenon where a high-pressure saturated liquid enters a relatively low-pressure container, and due to the sudden drop in pressure, the saturated liquid becomes a portion of the container's saturated vapor and saturated liquid under the container's pressure.

[0003] For the above-mentioned processes of separating different components such as distillation, rectification, and flash evaporation, the bottom of the column is heated with steam, and the top of the column is cooled with cooling water / chilled water.

[0004] Because heating and cooling at the bottom and top of the tower are independent, and because heating and cooling are opposite heat exchange processes, there is a loss of heat and energy, resulting in significant energy consumption. The minimum heating temperature at the bottom of the tower is close to the overflow temperature of the steam at the bottom, while the temperature of the steam after cooling at the top of the tower is lower than the minimum heating temperature at the bottom. Furthermore, the inventors believe that the contact between the heat absorption tubes and the heat release tubes in existing heat exchange devices leads to poor heat exchange efficiency. Therefore, there is an urgent need to design an evaporative 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 evaporative condenser skid-mounted isenthalpic energy-saving device that can achieve internal circulation and save energy loss.

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an evaporative condensation skid-mounted isenthalpic energy-saving device.

[0007] To achieve the aforementioned objectives, the technical solution adopted in this invention includes a raw material feeding system, a preheating system, a separation tower system, a primary isenthalpic evaporation-condensation integrated system, a secondary isenthalpic condensation-preheating integrated system, and a recovery system. The separation tower system includes a circulating pump, a separation tower, and a bottom liquid discharge valve. The primary isenthalpic evaporation-condensation integrated system includes an asymmetric flow channel plate reboiler, a first condenser, and a first throttling device. The secondary isenthalpic condensation-preheating integrated system includes a finished product tank, a second condenser, a second compressor, a condensing preheater, and a second throttling device. The raw material feeding system includes a raw material tank, a raw material pump, and a steam-assisted preheater. The asymmetric flow channel plate reboiler includes a multi-layer plate structure. The plate-like structures are arranged in an array and abut against each other; the plate-like structures include channels A and B; the vaporized liquid flows in channel A, and the refrigerant is placed in channel B; channels A and B are arranged intersecting along the length of the plate-like structures; channel B includes two turbulent sections and a cooling section; the cooling section has flat sections at both ends; the cooling section is located between two connected channels A, and the outer wall of the cooling section abuts against the two channels A, with the two adjacent channels A located on the same side of the cooling section; two turbulent sections are respectively located on both sides of the cooling section, and the two turbulent sections and the cooling section are on the same axis; the channels A have abutting sections at the positions corresponding to the turbulent sections; channels A abut against the turbulent sections.

[0008] Optionally, the side length of the cooling section is equal to the side length of the contact surface of channel A; the line connecting the midpoints of the two flat sections is parallel to the diagonal of the turbulent section, and the ratio of the line connecting the midpoints of the two flat sections to the diagonal of the parallel turbulent section is 1:2; the extension of the other diagonal of the turbulent section bisects the cooling section.

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

[0010] Optionally, two turbulent sections are provided between multiple A channels on the same plane in the multi-layer plate structure; the contact area between the A channel and the B channel, which is 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 circulating 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 the first condenser; 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 circulating 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 one; a connecting pipe is provided between condenser two and condenser one; a connecting pipe is provided between the finished product tank and condenser two; a connecting pipe is provided between condenser two and compressor two; a connecting pipe is provided between compressor two and condensing preheater; and a connecting pipe is provided between condensing preheater two and throttling device two.

[0014] Optionally, the output end of the raw material tank is connected to the raw material pump via a pipeline, and the raw material pump is connected to the steam-assisted preheater via a pipeline. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A system flowchart is provided for an embodiment of an evaporative condensation skid-mounted isenthalpic energy-saving device of the present invention;

[0017] Figure 2 This is a schematic diagram of the asymmetric flow channel plate reboiler structure provided for an embodiment of an evaporation-condensation skid-mounted isenthalpic energy-saving device of the present invention;

[0018] Figure label:

[0019] E-1, Circulating pump; E-2, Asymmetric flow channel plate reboiler; E-3, Separation tower; E-4, Feed tank; E-5, Compressor I; E-6, Condenser I; E-7, Finished product tank; E-8, Condenser II; E-9, Compressor II; E-10, Condensing preheater; E-11, Feed pump; E-12, Steam-assisted preheater; P, Connecting pipe; V-1, Throttling device I; V-2, Throttling device II; V-3, Bottom liquid discharge valve; F-1, Turbulent flow section; F-2, Cooling section; F-3, Leveling section;

[0020] In the accompanying drawings, the same parts are labeled with the same reference numerals; the drawings are not drawn to scale. Detailed Implementation

[0021] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The technical solution, its implementation process, and principles will be further explained below with reference to the accompanying drawings and specific implementation examples in the embodiments of this application.

[0022] 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 construed as limiting the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, the present invention covers any substitutions, modifications, equivalent methods and solutions made on the spirit, principles and scope of the present invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this application, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0024] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, when using positional terms such as "both sides," "outer side," and "upper and lower," it should be understood that they are used only for ease of understanding and description, taking into account that the structure may be oriented to other positions.

[0025] In the description of this application, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person with ordinary skills in the art to which this application pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, mating connection, or integral connection. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0026] The present invention aims to introduce and explain the structural composition of an evaporative 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 evaporative condensation skid-mounted isenthalpic energy-saving device in the present invention can be selected according to specific circumstances, and no special limitations or explanations are made here.

[0027] Furthermore, to provide the public with a better understanding of the present invention, certain specific details are described in detail in the following description of the invention. However, those skilled in the art will fully understand the invention even without these detailed descriptions.

[0028] Example 1

[0029] Please see Figure 1 and Figure 2 An evaporative condensation skid-mounted isenthalpic energy-saving device includes a raw material feeding system, a preheating system, a separation tower system, a primary isenthalpic evaporative condensation integrated system, a secondary isenthalpic condensation preheating integrated system, and a recovery system.

[0030] Please see Figure 1 and Figure 2 The separation tower system includes a circulating pump E-1, a separation tower E-3, and a bottom liquid discharge valve V-3; a connecting pipe P-1 is installed between the separation tower E-3 and the circulating pump E-1; a connecting pipe P-21 is installed between the separation tower E-3 and the bottom liquid discharge valve V-3; a connecting pipe P-3 is installed between the separation tower E-3 and the condenser E-6; and a connecting pipe P-18 is installed between the separation tower E-3 and the condensing preheater E-10.

[0031] Please see Figure 1 and Figure 2 The first-stage isenthalpic evaporator-condenser integrated system includes an asymmetric flow channel plate reboiler compressor E-2, a condenser E-6, and a throttling device V-1.

[0032] In the single-stage isenthalpic evaporation-condensation integrated system, a connecting pipe P-20 is installed between the asymmetric flow channel plate reboiler E-2 and the circulating pump E-1; a connecting pipe P-2 is installed between the asymmetric flow channel plate reboiler E-2 and the separation tower E-3; a connecting pipe P-5 is installed between the asymmetric flow channel plate reboiler E-2 and the compressor E-5; a connecting pipe P-6 is installed between the asymmetric flow channel plate reboiler E-2 and the throttling device V-1; a connecting pipe P-7 is installed between the throttling device V-1 and the condenser E-6; and a connecting pipe P-8 is installed between the compressor E-5 and the condenser E-6.

[0033] Please see Figure 1 and Figure 2 The two-stage isenthalpic condensing and preheating integrated system includes a finished product tank E-7, a second condenser E-8, a second compressor E-9, a condensing preheater E-10, and a second throttling device V-2;

[0034] A connecting pipe P-9 is installed between finished product tank E-7 and condenser one E-6; a connecting pipe P-10 is installed between condenser two E-8 and condenser one E-6; a connecting pipe P-11 is installed between finished product tank E-7 and condenser two E-8; a connecting pipe P-13 is installed between condenser two E-8 and compressor two E-9; a connecting pipe P-14 is installed between compressor two E-9 and condensing preheater E-10; a connecting pipe P-16 is installed between throttling device two V-2 and condenser two E-8; and a connecting pipe P-15 is installed between condensing preheater E-10 and throttling device two V-2.

[0035] Please see Figure 1 and Figure 2 The raw material 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 pipe P-19, and the raw material pump E-11 is connected to the steam-assisted preheater E-12 through a pipe P-17.

[0036] Please see Figure 1 and Figure 2 The asymmetric flow channel plate reboiler E-2 includes a multi-layer plate structure, in which the multi-layer plate structure is arranged in an array and abuts against each other; the plate structure includes channel A and channel B; the vaporized liquid flows in channel A, and the refrigerant is placed in channel B; channel A and channel B are arranged intersecting along the length of the plate structure.

[0037] Channel B includes two turbulent flow sections F-1 and a cooling section F-2. The cooling section F-2 is located between the two connected channels A, and its outer wall abuts against the two channels A. The two adjacent channels A are located on the same side of the cooling section F-2. The two turbulent flow sections F-1 are located on opposite sides of the cooling section F-2, and the two turbulent flow sections F-1 and the cooling section F-2 are on the same axis. Channel A has abutting parts (not shown) corresponding to the positions of the turbulent flow sections F-1. Channel A abuts against the turbulent flow sections F-1.

[0038] The cooling section F-2 has flattening sections F-3 at both ends; the line connecting the midpoints of the two flattening sections F-3 is parallel to the diagonal of the turbulent section F-1, and the ratio of the line connecting the midpoints of the two flattening sections F-3 to the diagonal of the parallel turbulent section F-1 is 1:2; the extension of the other diagonal of the turbulent section F-1 bisects the cooling section F-2; the extension of the outer wall of the cooling section F-2 and the A channel on the same side can intersect at a point, forming a rhombus shape.

[0039] The multi-layered plate structure array is arranged such that the cooling section F-2 abuts against multiple adjacent A channels. Except for the flattening section F-3, the cooling section F-2 abuts against all A channels. The side length of the cooling section F-2 is equal to the side length of the contact surface of the A channel. The turbulent section F-1 abuts against all adjacent A channels. Two turbulent sections F-1 are set between multiple A channels on the same plane of the multi-layered plate structure. The contact area between the A channel and the B channel that is not located at the edge of the multi-layered plate structure can reach more than 95% of the area.

[0040] Effects of the asymmetric flow channel plate reboiler E-2:

[0041] 1. Enhanced heat transfer efficiency: Turbulent section F-1 and cooling section F-2 work together: Turbulent section F-1 is set in channel B, and high turbulence intensity (Re≥15,000) is formed by the deflection of fluid in turbulent section F-1; Optimized contact area: The contact area between channels A and B is ≥95%, which improves the effective heat transfer area.

[0042] 2. Pressure drop and flow optimization; A-channel large flow channel design: Reduced flow resistance of gas-liquid mixture, pressure drop ΔP≤0.03MPa.

[0043] Narrow channel turbulence in channel B: The channel height is half that of channel A, increasing the refrigerant velocity, enhancing heat transfer while maintaining ΔP≤0.08MPa.

[0044] 3. Thermal stress and structural stability; Cooling section F-2 has a rhomboid layout; Flattening section F-3 and channel A abut against each other to disperse thermal stress, reducing the maximum stress concentration factor to 1.8; Multilayer plate array arrangement: Optimize the plate spacing to 8-12mm to control thermal deformation.

[0045] When using the equipment, check the connections: confirm that all pipes (P-1 to P-21) and valves (V-1 to V-3) are connected correctly and without leaks; ensure that the transmission equipment such as the circulating pump (E-1, E-11) and compressor (E-5, E-9) is adequately lubricated and that the instruments are calibrated.

[0046] Start the raw material pump E-11 to transport the raw material liquid from the raw material tank E-4 through the pipeline P-19 to the steam-assisted preheater E-12.

[0047] Turn on the steam-assisted preheater E-12 to heat the feed liquid to a partially vaporized state using external steam. When the temperature at the top of the separation tower E-3 reaches the preset threshold, turn off the steam-assisted preheater E-12 and switch to isenthalpic system operation.

[0048] In the operation of the first-stage isenthalpic evaporation and condensation integrated system, the steam path is as follows: the steam at 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.

[0049] The latent heat released during the condensation process is absorbed by the refrigerant, which is then compressed into a high-temperature gaseous state by compressor E-5 and enters the asymmetric flow channel plate reboiler E-2.

[0050] Reboiling process: The high-temperature refrigerant flows in the asymmetric flow channel B, heating the mixed liquid (channel A) pumped in by the circulating pump E-1, causing it to partially vaporize. The vapor generated by vaporization returns to the separation tower E-3 via pipeline P-2 to complete the cycle;

[0051] Refrigerant circulation: After the refrigerant is condensed in the asymmetric flow channel plate reboiler E-2, it is depressurized by the throttling device V-1 and returned to the condenser E-6 to complete the closed cycle.

[0052] In the operation of the two-stage isenthalpic condensation and preheating integrated system, the uncondensed gas is handled as follows: the gas that is not completely condensed in condenser E-6 enters condenser E-8 through pipeline P-10, condenses into liquid, and then enters the finished product tank E-7; secondary heat recovery: the heat released by condenser E-8 is absorbed by the refrigerant, compressed into a high-temperature gaseous state by compressor E-9, and enters the condensing preheater E-10; raw material liquid preheating: the high-temperature refrigerant exchanges heat with the raw material liquid in the condensing preheater E-10, and after condensation, the refrigerant is depressurized by throttling device V-2 and returned to condenser E-8.

[0053] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A skid-mounted isenthalpic energy-saving device for evaporation and condensation, characterized in that: An evaporative condensation skid-mounted isenthalpic energy-saving device includes a raw material feeding system, a preheating system, a separation tower system, a primary isenthalpic evaporative condensation integrated system, a secondary isenthalpic condensation preheating integrated system, and a recovery system; The separation tower (E-3) system includes a circulation pump (E-1), the separation tower (E-3), and a bottom liquid discharge valve (V-3); The single-stage isenthalpic evaporation-condensation integrated system includes an asymmetric flow channel plate reboiler (E-2), condenser one (E-6), and throttling device one (V-1); The two-stage isenthalpic condensing and preheating integrated system includes a finished product tank (E-7), a second condenser (E-8), a second compressor (E-9), a condensing preheater (E-10), and a second throttling device (V-2); The feed liquid system includes a feed tank (E-4), a feed pump (E-11), and a steam-assisted preheater (E-12); The asymmetric flow channel plate reboiler (E-2) includes a multi-layer plate structure, in which the multi-layer plate structure is arranged in an array and abuts against each other; the plate structure includes channel A and channel B; the vaporized liquid flows in channel A, and the refrigerant is placed in channel B; channel A and channel B are arranged to cross each other along the length of the plate structure. Channel B includes two turbulent sections (F-1) and a cooling section (F-2); the cooling section (F-2) has flattening sections (F-3) at both ends; the cooling section (F-2) is located between two connected channels A, and its outer wall abuts against the two channels A, with the two adjacent channels A located on the same side of the cooling section (F-2); the two turbulent sections (F-1) are respectively located 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; the position of the channel A corresponding to the turbulent section (F-1) is... It has an abutting section; channel A abuts against the turbulent section (F-1); the side length of the cooling section (F-2) is equal to the side length of the abutting surface of channel A; the line connecting the midpoints of the two flat sections (F-3) is parallel to the diagonal of the turbulent section (F-1), and the ratio of the line connecting the midpoints of the two flat sections (F-3) to the diagonal of the parallel turbulent section (F-1) is 1:2; the extension of the other diagonal of the turbulent section (F-1) bisects the cooling section (F-2); the large flow channel design of channel A reduces the flow resistance of the gas-liquid mixture, and the pressure drop ΔP ≤ 0.03MPa; B-channel narrow flow channel turbulence: The flow channel height is half that of the A-channel, the refrigerant flow rate is increased, heat transfer is enhanced while maintaining ΔP≤0.08MPa; two turbulence sections (F-1) are set between multiple A-channels on the same plane in a multi-layer plate structure.

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

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

4. The evaporative condensation skid-mounted isenthalpic energy-saving device according to claim 1, characterized in that: A connecting pipe is installed between the finished product tank (E-7) and condenser one (E-6); a connecting pipe is installed between condenser two (E-8) and condenser one (E-6); a connecting pipe is installed between the finished product tank (E-7) and condenser two (E-8); a connecting pipe is installed between condenser two (E-8) and compressor two (E-9); a connecting pipe is installed between compressor two (E-9) and condensing preheater (E-10); a connecting pipe is installed between throttling device two (V-2) and condenser two (E-8); and a connecting pipe is installed between condensing preheater (E-10) and throttling device two (V-2).

5. The evaporative 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) via a pipeline, and the raw material pump (E-11) is connected to the steam auxiliary preheater (E-12) via a pipeline.

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