Evaporation apparatus for asynchronous mass transfer

Abstract

The application provides an evaporation device with asynchronous mass transfer, which comprises a shell (1) which is provided with a space for containing evaporation liquid; a heat transfer area (11) and an evaporation area (12) are arranged in the shell (1), the height of the evaporation area (12) is higher than that of the heat transfer area (11), a circulation channel is formed in the shell (1) to enable the evaporation liquid to flow and circulate between the heat transfer area (11) and the evaporation area (12), and a steam chamber (13) is arranged above the evaporation area (12); a partition wall heat exchange unit (3) is arranged in the heat transfer area (11); and a compressor (4) is connected to the steam chamber (13) at an air inlet end and connected to the partition wall heat exchange unit (3) at an air outlet end, so that the steam in the steam chamber (13) can be compressed and then introduced into the partition wall heat exchange unit (3).

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high-salinity waste liquid treatment, and particularly relates to an evaporation device with asynchronous mass transfer. BACKGROUND

[0002] In the existing steam recompression evaporation device, heat transfer and evaporation are performed synchronously, which is prone to cause crystallization in the heat exchanger, resulting in fouling of the heat transfer interface and further affecting the heat exchange efficiency of the heat exchanger and the stability of long-term operation of the device. SUMMARY

[0003] The present application aims to provide an evaporation device with asynchronous mass transfer to solve or alleviate the problem of fouling on the surface of the heat exchanger.

[0004] The embodiments of the present application provide an evaporation device with asynchronous mass transfer, comprising:

[0005] a shell, which is formed with a space for accommodating evaporation liquid;

[0006] The inside of the shell is provided with a heat transfer zone and an evaporation zone, the height of the evaporation zone is higher than that of the heat transfer zone, and the inside of the shell forms a circulation channel, so that the evaporation liquid can flow circularly between the heat transfer zone and the evaporation zone, and the upper part of the evaporation zone is a steam chamber;

[0007] a partition wall heat exchange unit, which is arranged in the heat transfer zone; and

[0008] a compressor, the gas inlet end of which is connected to the steam chamber, and the gas outlet end of which is connected to the partition wall heat exchange unit, so that the steam in the steam chamber can be compressed and introduced into the partition wall heat exchange unit.

[0009] In at least one possible implementation, the cross section of the shell is L-shaped, the part of the L-shaped structure extending in the horizontal direction is the heat transfer zone, the part of the L-shaped structure extending in the vertical direction is the evaporation zone, and the heat transfer zone and the evaporation zone are connected.

[0010] In at least one possible implementation, the evaporation device further comprises a partition plate, which defines the circulation channel in the inside of the shell, so that the evaporation liquid can flow circularly in the heat transfer zone and the evaporation zone.

[0011] In at least one possible implementation, the partition plate is composed of a partition plate first part and a partition plate second part,

[0012] the partition plate first part extends in the horizontal direction, the partition plate second part extends in the vertical direction, the partition plate first part is arranged in the heat transfer zone, and the partition plate second part is arranged in the evaporation zone.

[0013] In at least one possible implementation, the partition plate is formed with a residue discharge channel between the adjacent portions of the first portion and the second portion of the partition plate, and the bottom of the evaporation zone is provided with a residue discharge port, and the outlet of the residue discharge channel corresponds to the position of the residue discharge port.

[0014] In at least one possible implementation, the evaporation device further comprises a steam supplement port for supplying steam to the partition wall heat exchange unit.

[0015] In at least one possible implementation, the partition wall heat exchange unit comprises a steam inlet, and the outlet of the compressor is connected to the steam inlet.

[0016] The evaporation device further comprises a liquid supplement port for supplying liquid to the partition wall heat exchange unit from the steam inlet.

[0017] In at least one possible implementation, the partition wall heat exchange unit comprises a condensate outlet for discharging condensate generated after steam heat exchange in the partition wall heat exchange unit.

[0018] In at least one possible implementation, the evaporation device further comprises a circulating pump connected to the shell, and the circulating pump provides power for the circulation of the evaporation liquid in the shell.

[0019] In at least one possible implementation, the pipeline of the inlet end of the circulating pump is connected to the shell at a position away from the heat transfer zone on the side of the second portion of the partition plate.

[0020] The pipeline of the outlet end of the circulating pump is connected to the shell at a position below the first portion of the partition plate.

[0021] In at least one possible implementation, the partition wall heat exchange unit is arranged above the first portion of the partition plate.

[0022] The liquid level of the evaporation liquid in the shell is lower in the heat transfer zone than in the evaporation zone, the evaporation liquid contacts the top surface of the shell in the heat transfer zone, and the evaporation liquid is spaced apart from the top surface of the shell in the evaporation zone.

[0023] By using the above technical solution, the height difference formed by the heat transfer zone and the evaporation zone enables the evaporation liquid to maintain an unsaturated state in the heat transfer zone, realizes non-evaporation heating of the evaporation liquid, reduces the scaling of the partition wall heat exchange unit caused by evaporation, and enables the partition wall heat exchange unit to have a high heat exchange efficiency, so that the evaporation device can be stably operated for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1A structural schematic diagram of an evaporation device with asynchronous mass transfer according to an embodiment of the present application is shown.

[0025] Legend of reference signs

[0026] 1 housing 11 heat transfer zone 12 evaporation zone 13 vapor chamber 14 liquid supplement port 15 residue discharge port

[0027] 2 partition 21 first part of the partition 22 second part of the partition 23 residue discharge passage

[0028] 3 partitioned heat exchange unit 31 vapor inlet 32 condensate outlet

[0029] 4 compressor 41 vapor supplement port 42 liquid supplement port

[0030] 5 circulating pump DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the present application, the specific embodiments of the present application are described in detail in this section in conjunction with the drawings. In addition to the various embodiments described in this section, the present application can be implemented in other different ways, and those skilled in the art can make corresponding improvements, modifications and substitutions without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed in this section. The scope of protection of the present application should be subject to the claims.

[0032] As shown in Figure 1 , an embodiment of the present application proposes an evaporation device with asynchronous mass transfer, which comprises a housing 1, a partition 2, a partitioned heat exchange unit 3, a compressor 4 and a circulating pump 5, and the partition 2 and the partitioned heat exchange unit 3 are both arranged inside the housing 1.

[0033] The housing 1 is formed with a space for accommodating evaporation liquid, which can be high-salinity waste liquid. The inside of the housing 1 is provided with a heat transfer zone 11 and an evaporation zone 12, and the height of the evaporation zone 12 is higher than that of the heat transfer zone 11.

[0034] The top of the housing 1 has two parts with different heights, the lower part of the top corresponds to the heat transfer zone 11, and the higher part of the top corresponds to the evaporation zone 12. The cross section of the housing 1 can be L-shaped, the part of the L-shaped extending along the horizontal direction X can be the heat transfer zone 11, and the part of the L-shaped extending along the vertical direction can be the evaporation zone 12. The heat transfer zone 11 and the evaporation zone 12 are connected. The liquid level of the evaporation liquid inside the housing 1 is lower in the heat transfer zone 11 than in the evaporation zone 12. The evaporation liquid in the heat transfer zone 11 can contact the top surface of the housing 1, and the liquid level of the evaporation liquid in the evaporation zone 12 has a gap with the top surface of the housing 1. Above the liquid level of the evaporation zone 12 is a vapor chamber 13, and the gas generated by the evaporation of the evaporation liquid in the evaporation zone 12 can be accommodated in the vapor chamber 13.

[0035] The partition wall heat exchange unit 3 is arranged in the heat transfer zone 11, and the partition wall heat exchange unit 3 comprises heat exchange pipes, and steam inlets 31 and condensed water outlets 32 are arranged at two ends of the heat exchange pipes respectively. The partition wall heat exchange unit 3 can transfer heat of steam in the heat exchange pipes to the evaporated liquid. The condensed water outlet 32 of the partition wall heat exchange unit 3 can extend to the outside of the shell 1, and the condensed water outlet 32 is used for discharging condensed water generated after steam heat exchange in the partition wall heat exchange unit 3.

[0036] The partition wall heat exchange unit 3 can be close to the top of the shell 1 of the heat transfer zone 11. Liquid pressure of the evaporated liquid around the partition wall heat exchange unit 3 (in the heat transfer zone) is greater than that of the evaporated liquid in the evaporation zone 12, so that evaporation of the evaporated liquid in the heat transfer zone 11 is inhibited, and thus the partition wall heat exchange unit 3 is less fouled, and the stable operation time of the evaporation device is prolonged.

[0037] The steam chamber 13 is provided with a steam outlet which is communicated with the gas inlet end of the compressor 4, and the gas outlet end of the compressor 4 can be connected to the steam inlet 31 of the partition wall heat exchange unit 3. Steam generated in the evaporation zone 12 can be converted into a high-quality heat source after being compressed by the compressor 4, and then supplied to the partition wall heat exchange unit 3 in the heat transfer zone 11, so that the heat of the steam is utilized, and energy consumption is reduced. The compressor 4 can make the pressure in the steam chamber 13 lower than the saturation pressure of the evaporated liquid in the evaporation zone 12, and make the steam be pressurized and delivered to the partition wall heat exchange unit 3, so as to provide high-temperature steam as a heat source for the partition wall heat exchange unit 3.

[0038] Further, the evaporation device further comprises a steam supplement port 41 for supplying steam to the partition wall heat exchange unit 3, and the steam supplement port 41 can be arranged in a pipeline connecting the compressor 4 and the partition wall heat exchange unit 3. When the evaporation device starts to operate in an asynchronous mass transfer mode, the steam chamber 13 has not generated steam or has a small amount of steam, and steam can be supplied to the steam inlet 31 of the partition wall heat exchange unit 3 through the steam supplement port 41, so as to provide heat for the heat transfer zone 11 and heat the evaporated liquid.

[0039] Further, the evaporation device further comprises a liquid supplement port 42 for supplying liquid to the partition wall heat exchange unit 3 from the steam inlet 31, and the liquid supplement port 42 can be arranged in a pipeline connecting the compressor 4 and the partition wall heat exchange unit 3. Supplying liquid to the steam inlet 31 of the partition wall heat exchange unit 3 through the liquid supplement port 42 can reduce the temperature of the compressed steam and the superheat degree of the compressed steam, so as to reduce the temperature difference between the compressed steam and the evaporated liquid near the steam inlet 31 of the partition wall heat exchange unit 3, and avoid the formation of crystals of the evaporated liquid near the steam inlet 31 of the partition wall heat exchange unit 3.

[0040] The bottom of the shell 1 can be provided with a slag discharge port 15, and the slag discharge port 15 can be located at the bottom of the evaporation zone 12.

[0041] Further, in the horizontal direction X of the heat transfer zone 11 pointing to the evaporation zone 12, the bottom surface of the shell 1 can form a downwardly inclined slope, and the slag discharge port 15 can be located at the bottom end of the slope. A small amount of solid crystals formed by evaporation in the heat transfer zone 11 can flow to the slag discharge port 15 at the bottom of the evaporation zone 12 under the action of gravity, and the crystals generated by evaporation can be concentrated at the bottom of the evaporation zone 12 and discharged through the slag discharge port 15.

[0042] Since the liquid level of the heat transfer zone 11 is lower than the liquid level of the evaporation zone 12, and the heat transfer zone 11 and the evaporation zone 12 are communicated, the liquid pressure of the heat transfer zone 11 is higher than the liquid pressure of the evaporation zone 12, and the pressure of the evaporation liquid at the highest position of the heat transfer zone 11 is higher than the saturation pressure of the evaporation liquid (at the highest temperature of the liquid), so the evaporation liquid in the heat transfer zone 11 hardly evaporates, and thus the fouling of the partition heat exchange unit 3 is less.

[0043] The partition plate 2 can define a circulation channel for the evaporation liquid inside the shell 1, so that the evaporation liquid flows in circulation in both the heat transfer zone 11 and the evaporation zone 12. Figure 1 The dashed arrows in the figure represent the flow direction of the evaporation liquid. The partition plate 2 can include a partition plate first portion 21 extending in the horizontal direction X as a whole and a partition plate second portion 22 extending in the vertical direction Y as a whole. The liquid level of the evaporation zone 12 exceeds the upper edge of the partition plate second portion 22, so that the evaporation liquid can flow in circulation over the upper edge of the partition plate second portion 22.

[0044] The partition plate first portion 21 can be arranged below the partition heat exchange unit 3 of the heat transfer zone 11, and the partition plate second portion 22 can be arranged in the evaporation zone 12. On the oblique upper side of the partition plate 2 (on the left upper side of the partition plate 2 in the figure), the evaporation liquid can flow from the heat transfer zone 11 to the evaporation zone 12, and on the oblique lower side of the partition plate 2 (on the right lower side of the partition plate 2 in the figure), the evaporation liquid can flow from the evaporation zone 12 to the heat transfer zone 11. Figure 1 Figure 1

[0045] It can be understood that the above-mentioned embodiments only exemplarily disclose a structure of a partition plate that can facilitate the circulation of the evaporation liquid between the heat transfer zone 11 and the evaporation zone 12, and the present application is not limited thereto. For those skilled in the art, the partition plate structure capable of forming a circulation channel can be arranged according to the specific circumstances, and even if no partition plate is arranged, the evaporation liquid can also circulate between the heat transfer zone and the evaporation zone only relying on the driving of the steam and the power of the liquid supplement.

[0046] The adjacent portions of the partition plate first portion 21 and the partition plate second portion 22 can have a gap therebetween, which can form a slag discharge channel 23, and the slag discharge channel 23 can lead to the slag discharge port 15.

[0047] ​​The first portion 21 of the partition plate can form an inclined surface, and the first portion 21 of the partition plate extends downwardly to the slag discharge passage 23, so that the crystalline produced by evaporation is concentrated by the inclined surface and discharged to the slag discharge port 15 through the slag discharge passage 23.

[0048] The circulation pump 5 can be connected to the shell 1 through a pipe, and the evaporation liquid can be sprayed from the outlet of the circulation pump 5 to the inside of the shell 1, which helps the evaporation liquid to circulate. The circulation pump 5 can provide power for the evaporation liquid to circulate in the inside of the shell 1.

[0049] The pipe of the inlet end of the circulation pump 5 can be connected to the shell 1 at a position away from the heat transfer area 11 on the second portion 22 of the partition plate, at which position the evaporation liquid can flow downwardly from the top. The pipe of the outlet end of the circulation pump 5 can be connected to the shell 1 at a position below the first portion 21 of the partition plate. The circulation speed of the evaporation liquid can be controlled by controlling the rotating speed or power of the circulation pump 5, so as to help maintain the temperature of the evaporation liquid in the heat transfer area 11 to be lower than the boiling point of the evaporation liquid.

[0050] The heat transfer area 11 can be provided with a liquid supplement port 14, through which the evaporation liquid can be supplemented to the heat transfer area 11. The liquid supplement port 14 can correspond to the edge portion of the first portion 21 of the partition plate, and the evaporation liquid entering the shell 1 from the liquid supplement port 14 can flow around the partition plate 2 through the edge portion of the first portion 21 of the partition plate. By controlling the flow rate of the supplemented evaporation liquid, the temperature of the evaporation liquid in the heat transfer area 11 can be maintained to be lower than the boiling point of the evaporation liquid.

[0051] The inside of the shell 1 can be provided with a liquid level sensor, and the liquid level detection can be used to feedback adjust the liquid inflow of the liquid supplement port 14, so that the liquid inflow is equal to the evaporation amount, the liquid level is kept stable, and the liquid pressure of the heat transfer area 11 is in a stable state.

[0052] In the present embodiment, the combustion gas is not used in the heat transfer area 11, and there is no flue gas chamber above or on the top of the heat transfer area 11.

[0053] The working process of the asynchronous mass transfer evaporation device will be described below.

[0054] When the asynchronous mass transfer evaporation device is started, steam is introduced into the steam inlet 31 of the partition wall heat exchange unit 3 through the steam supplement port 41, so as to provide heat for the heat transfer area 11 and heat the evaporation liquid. The evaporation liquid in the heat transfer area 11 is maintained in an unsaturated state, and the evaporation liquid is heated but not evaporated. The evaporation liquid is circulated in the heat transfer area 11 and the evaporation area 12 by the circulation pump 5, the pressure of the evaporation area 12 is smaller, and the evaporation liquid evaporates in the evaporation area 12. The steam produced by evaporation is compressed by the compressor 4 and then introduced into the partition wall heat exchange unit 3 as a heat source, and the evaporation liquid is heated by the partition wall heat exchange unit 3. The crystalline produced by evaporation can be discharged from the shell 1 through the slag discharge port 15.

[0055] The application can obtain the following beneficial effects through the technical scheme.

[0056] (1) The height difference formed by the heat transfer area 11 and the evaporation area 12 enables the evaporating liquid to maintain an unsaturated state in the heat transfer area 11, so that the heating and non-evaporation of the evaporating liquid are realized, the crystallization caused by evaporation is reduced to form scale on the partition heat exchange unit 3, the heat exchange efficiency of the partition heat exchange unit 3 is higher, and the evaporation device can be stably operated for a longer time.

[0057] (2) The steam generated by evaporation can be compressed by the compressor 4 and delivered to the partition heat exchange unit 3 as a heat source for the heat transfer area 11, so that the heat of the steam is effectively utilized, and the energy consumption of the evaporation device is lower.

[0058] (3) The crystallization produced by evaporation can be concentrated through the inclined surface of the bottom of the shell 1 and the inclined surface of the first part 21 of the partition plate and discharged through the slag discharge port 15.

[0059] It should be understood that at least some aspects or features of the above-mentioned embodiments, examples or examples can be appropriately combined.

[0060] It can be understood that in the present application, when the number of components or members is not particularly limited, the number thereof can be one or more, and here, multiple refers to two or more. For the case where the number of components or members is described as a specific number such as two, three, four, etc. in the drawings and / or the description, the specific number is generally exemplary and not limiting, and it can be understood as multiple, i.e. two or more, but this does not mean that the present application excludes the case of one.

[0061] In the present application, unless otherwise explicitly stated or limited, the terms "mounting", "assembly", "assembly", "connection", "connection", "coupling", "linking", "abutting", "communication", "communication", "conduction", "fixing", "fastening" and the like should be understood in a broad sense, for example, it can be direct or indirect. For example, in terms of connection, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication or interaction relationship between two elements, unless otherwise explicitly stated or limited. For example, in terms of communication / conduction, it can be direct communication / conduction, or indirect communication / conduction via an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] In the present application, unless specifically stated or limited otherwise, a component is disposed in / installed in / located in / contained in / placed in another component, etc. can be either of the following two cases: a part or most of the component is located in the other component; and the component is completely contained in the other component.

[0063] Although the present application has been described in detail above with reference to the embodiments, it is apparent to those skilled in the art that the present application is by no means limited to the embodiments described in the present specification. The present application can be modified in various ways and implemented as modified embodiments without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in the present specification is intended for the purpose of illustration only and is by no means intended to limit the present application in any way.

Claims

1. An evaporative device for mass transfer in an asynchronous manner, characterized in that, The application relates to an evaporation device. The shell (1) is internally provided with a heat transfer area (11) and an evaporation area (12), the height of the evaporation area (12) is higher than the height of the heat transfer area (11), the inside of the shell (1) forms a circulation channel, so that the evaporation liquid can flow between the heat transfer area (11) and the evaporation area (12), and the upper portion of the evaporation area (12) is a steam chamber (13). A partition heat exchange unit (3) is arranged in the heat transfer area (11); and A compressor (4) is arranged, the gas inlet end of the compressor (4) is connected to the steam chamber (13), the gas outlet end of the compressor (4) is connected to the partition heat exchange unit (3), and the compressor (4) can make the steam in the steam chamber (13) be compressed and then be introduced into the partition heat exchange unit (3). The cross section of the shell (1) is L-shaped, the part of the L-shaped part extending along the horizontal direction (X) is the heat transfer area (11), the part of the L-shaped part extending along the vertical direction (Y) is the evaporation area (12), and the heat transfer area (11) and the evaporation area (12) are communicated.

2. The evaporation apparatus of claim 1, wherein The evaporation device further comprises a partition plate (2), the partition plate (2) defines the circulation channel in the inside of the shell (1), and the evaporation liquid flows in the heat transfer area (11) and the evaporation area (12).

3. The evaporative device of claim 1, wherein, The partition plate (2) is composed of a partition plate first part (21) and a partition plate second part (22), 4. The evaporative device of claim 3, wherein, The partition plate first part (21) extends along the horizontal direction (X), the partition plate second part (22) extends along the vertical direction (Y), the partition plate first part (21) is arranged in the heat transfer area (11), and the partition plate second part (22) is arranged in the evaporation area (12). The partition plate (2) is formed with a residue discharging channel (23), the residue discharging channel (23) is located between the adjacent parts of the partition plate first part (21) and the partition plate second part (22), the bottom of the evaporation area (12) is provided with a residue discharging port (15), and the outlet position of the residue discharging channel (23) corresponds to the position of the residue discharging port (15).

5. The evaporation apparatus of claim 4, wherein The evaporation device further comprises a steam supplement port (41) for introducing steam into the partition heat exchange unit (3).

6. The evaporative device of claim 1, wherein, The partition heat exchange unit (3) comprises a steam inlet (31), the gas outlet end of the compressor (4) is connected to the steam inlet (31), 7. The device of claim 1, wherein The evaporation device further comprises a liquid supplement port (42) for introducing liquid from the steam inlet (31) into the partition heat exchange unit (3). The partition heat exchange unit (3) comprises a condensed water outlet (32) for discharging condensed water generated after steam heat exchange in the partition heat exchange unit (3).

8. The evaporative device of claim 1, wherein, The evaporation device further comprises a circulation pump (5) connected to the shell (1), and the circulation pump (5) provides power for the circulation of the evaporation liquid in the inside of the shell (1).

9. The evaporation apparatus of claim 4, wherein ​ 10. The evaporation apparatus of claim 9, wherein The pipe connected to the inlet end of the circulation pump (5) is connected to the shell (1) at a position on the side of the second part (22) of the partition away from the heat transfer area (11), The pipe connected to the outlet end of the circulation pump (5) is connected to the shell (1) at a position below the first part (21) of the partition.

11. The evaporation apparatus of claim 4, wherein The partition wall heat exchange unit (3) is arranged above the first part (21) of the partition, The evaporation liquid inside the shell (1) has a liquid level in the heat transfer area (11) lower than that in the evaporation area (12), the evaporation liquid contacts the top surface of the shell in the heat transfer area (11), and the evaporation liquid is spaced apart from the top surface of the shell in the evaporation area (12).

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