A microchannel reboiler

Abstract

The present invention relates to a microchannel reboiler, comprising: a substrate, and a heat source plate attached to the outside of the substrate; the substrate is composed of two planar substrates that fit each other, the planar substrate includes an inner cavity and an edge surrounding the outer side of the inner cavity, and the inner cavity area forms a cavity structure after the edges of the two planar substrates are butted against each other; a plurality of microchannels are arranged on the inner surface of the planar substrate; a heat medium chamber is provided between the substrate and the heat source plate, and the heat medium chamber is filled with a heat medium for heat exchange to achieve heating of the material in the microchannel. The microchannel reboiler of the present invention has a simple structure, and the equipment with heat exchange function and gas-liquid separation function is directly fixed by bolts, and no pipeline connection is required, so the sealing performance can be guaranteed; this structure changes the sealing structure of the existing heat exchanger and gas-liquid separation tank that uses pipeline connection.

Description

Technical Field

[0001] The invention relates to the technical field of reboilers, in particular to a microchannel reboiler. Background Art

[0002] Reboiler, also known as reboiler, is a common equipment in chemical production; it is a device for heating and vaporizing liquid. It is an industrial equipment that heats and vaporizes liquid through a heat exchanger and achieves vapor-liquid separation. Generally, the reboiler is composed of a heat exchanger and a vapor-liquid separation tank. Its heat exchanger is generally made of metal, graphite or plastic; its vapor-liquid separation tank is generally made of metal, plastic or metal-lined corrosion-resistant material; the heat exchanger and the vapor-liquid separation tank are generally connected by pipes; there is also a structure in which the heat exchange tube is directly placed in the liquid in the tank, but usually this equipment is called an evaporator.

[0003] The reboilers in the prior art all have the following defects: the reboilers made of ordinary metal materials have poor corrosion resistance and cannot meet production needs. The corrosion resistance of reboilers made of special materials, alloys, and precious metals may meet production needs, but they are expensive and have high maintenance costs. Reboilers made of metal-lined corrosion-resistant materials may meet production needs in terms of corrosion resistance, but the lining cost is high, the lining is not resistant to high temperatures, or the lining is not resistant to negative pressure. Ceramic materials (such as silicon carbide) can meet the working conditions of corrosion resistance, high temperature resistance, and negative pressure resistance, but there are difficulties in connecting ceramic equipment.

[0004] The reboiler of the prior art is relatively large in size and cannot be adapted to the microchannel production system. In addition, since the heat exchanger and the vapor-liquid separation tank are connected by a pipeline, there is a leakage problem at the connection.

[0005] For some highly corrosive materials (for example, a mixed acid solution of hydrofluoric acid, nitric acid, fluosilicic acid and sulfuric acid), distillation or component separation must be achieved under high temperature or even negative pressure conditions, and the reboiler equipment in the prior art cannot accomplish the task.

[0006] In view of this, the present invention proposes a microchannel reboiler, which changes its conventional usage form and solves the difficult problem of sealing cooperation between the heat exchanger and the separator. Summary of the invention

[0007] The present invention provides a microchannel reboiler to solve the technical problem of sealing cooperation between a heat exchanger and a separator in the prior art.

[0008] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0009] A microchannel reboiler, comprising:

[0010] A substrate, and a heat source plate attached to the outside of the substrate; the substrate is composed of two planar substrates attached to each other, the planar substrates include an inner cavity and an edge surrounding the outer side of the inner cavity, and the inner cavity area forms a cavity structure when the edges of the two planar substrates are butted against each other;

[0011] A plurality of microchannels are arranged on the inner surface of the planar substrate;

[0012] A heat medium chamber is provided between the substrate and the heat source plate, and the heat medium chamber is filled with a heat medium for heat exchange so as to heat the material in the microchannel.

[0013] In some embodiments, the heat medium chamber is disposed on the outer side of the substrate, or on the inner side of the heat source plate.

[0014] In some embodiments, the heat medium chamber includes a plurality of heat medium channels connected end to end, and the running direction of the heat medium channels is perpendicular to the running direction of the microchannels.

[0015] In some embodiments, a feed inlet and a steam outlet are provided at the upper portion of the substrate, and a discharge port and a concentrated liquid outlet are provided at the lower portion of the substrate.

[0016] In some embodiments, the microchannel is a groove with a width of 0.1 to 5 mm and a depth of 1 to 10 mm.

[0017] In some embodiments, the microchannels are distributed in a tic-tac-toe pattern.

[0018] In some embodiments, the cross-sectional size of the heat medium channel is 1-10 mm×5-20 mm.

[0019] In some embodiments, the heat source plate is provided with a heat medium inlet and a heat medium outlet respectively connected to the heat source.

[0020] In some embodiments, the heat source plates are in two pieces, which are respectively attached to the outside of the base. The heat source plates are provided with mounting holes and are fixed by bolts.

[0021] The present invention has the following beneficial effects:

[0022] (1) The microchannel reboiler of the present invention has a simple structure. The devices for heat exchange function and gas-liquid separation function are directly fixed by bolts, and no longer need to be connected by pipes, so the sealing performance can be guaranteed. This structure changes the sealing structure of the existing heat exchanger and gas-liquid separation tank connected by pipes.

[0023] (2) The microchannel reboiler of the present invention adopts a microchannel structure, which increases the contact area of ​​the material and improves the heat exchange efficiency.

[0024] (3) The present invention has a compact structure. Compared with the prior art, it has a smaller volume and lighter weight under the same heat exchange efficiency. Moreover, it occupies a small space and is suitable for compact production systems (e.g., skid-mounted equipment).

[0025] (4) The device of the present invention can be used as a single piece or as a stack of multiple pieces; it can be adapted from laboratory devices to large-scale industrial production devices. Moreover, from laboratory test completion to industrial large-scale production, its design parameters and use effects are completely equal.

[0026] (5) The device of the present invention is suitable for various materials, which is equivalent to adapting to various processes! When the inner and outer parts are made of different materials, the sealing and connection (bonding or bolting) between them are very simple. When the inner and outer parts are made of the same material, they can even be sealed and connected by welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 This is a schematic structural diagram of a first microchannel reboiler of the present invention;

[0029] Figure 2 This is a schematic cross-sectional structure diagram of a substrate of a first microchannel reboiler of the present invention;

[0030] Figure 3 This is a schematic diagram of the inner side structure of the substrate of the first microchannel reboiler of the present invention;

[0031] Figure 4 for Figure 3 Enlarged schematic diagram of the middle Q section;

[0032] Figure 5 This is a schematic cross-sectional structure diagram of a heat source plate of a first microchannel reboiler of the present invention;

[0033] Figure 6 This is a schematic diagram of the inner side structure of a heat source plate of a first microchannel reboiler of the present invention;

[0034] Figure 7 This is a schematic structural diagram of a second microchannel reboiler of the present invention;

[0035] Figure 8 This is a schematic cross-sectional structure diagram of a substrate of a second microchannel reboiler of the present invention;

[0036] Fig. 9 This is a schematic diagram of the inner side structure of the substrate of the second microchannel reboiler of the present invention;

[0037] Fig.10 for Fig. 9 Enlarged schematic diagram of the middle Q section;

[0038] Fig.11 This is a schematic diagram of the outer side structure of the substrate of the second microchannel reboiler of the present invention;

[0039] Fig.12 This is a schematic cross-sectional structure diagram of a heat source plate of a second microchannel reboiler of the present invention;

[0040] Fig.13 This is a schematic diagram of the inner side structure of the heat source plate of the second microchannel reboiler of the present invention. DETAILED DESCRIPTION

[0041] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific diagrams.

[0042] Example 1

[0043] Reference Figure 1-6 As shown, a microchannel reboiler 1 comprises: a substrate 100 and a heat source plate 200. The substrate 100 has a cavity structure 1001, which is used to store liquid materials and for gas-liquid separation. The substrate 100 is composed of two planar substrates 1002 that fit each other, and the planar substrate 1002 comprises an inner cavity 10021 and an edge 10022 surrounding the outer side of the inner cavity 10021. After the edges of the two planar substrates are butted against each other, the inner cavity area forms a cavity structure 1001. A plurality of microchannels 10023 are arranged on the inner surface of the planar substrate 1002, and the microchannels can increase the contact area of ​​the material and improve the separation efficiency. The microchannel 10023 is a groove, and its design parameters can be selected from a width of 0.1 to 5 mm and a depth of 1 to 10 mm. In this embodiment, the microchannels are distributed in a tic-tac-toe shape.

[0044] In order to vaporize the liquid in the microchannel 10023 for gas-liquid separation, a heat source is required. The heat source plate 200 is attached to the outer side of the substrate 100; a heat medium chamber 300 is provided between the substrate 100 and the heat source plate 200, and the heat medium chamber 300 is filled with a heat medium for heat exchange to achieve heating of the material in the microchannel. The heat medium chamber 300 can be arranged on the outer side of the substrate 100, or on the inner side of the heat source plate 200. In this embodiment, it is arranged on the inner side of the heat source plate 200. In order to further improve the efficiency of heat exchange, the heat medium chamber 300 includes a plurality of heat medium channels 3001 connected end to end, and the running direction of the heat medium channel 3001 is perpendicular to the running direction of the microchannel 10023. The cross-sectional size of the heat medium channel can be selected from 1 to 10 mm × 5 to 20 mm. The heat source plate 200 is provided with a heat medium inlet and a heat medium outlet respectively connected to the heat source.

[0045] In this embodiment, a feed inlet 1003 and a steam outlet 1004 are provided at the upper part of the base 100, and a discharge port 1005 and a concentrated liquid outlet 1006 are provided at the lower part. Such an opening arrangement of the base 100 is beneficial to energy saving.

[0046] In specific applications, the feed port 1003 is connected to an external raw material supply pipeline to provide liquid. The steam outlet 1004 is connected to an external steam channel. The discharge port 1005 is connected to an external raw material supply pipeline. The concentrated liquid outlet 1006 is connected to an external concentrated liquid receiving channel.

[0047] The substrate 100 and the heat source plate 200 in this embodiment are both made of silicon carbide material. The heat source plate 200 is fixed around by bolts 400, so that the substrate 100 is clamped between the two heat source plates 200 to form a sealing structure.

[0048] Example 2

[0049] Reference Figure 7-13 As shown, a microchannel reboiler 1 comprises: a substrate 100 and a heat source plate 200. The substrate 100 has a cavity structure 1001, which is used to store liquid materials and for gas-liquid separation. The substrate 100 is composed of two planar substrates 1002 that fit each other, and the planar substrate 1002 comprises an inner cavity 10021 and an edge 10022 surrounding the outer side of the inner cavity 10021. After the edges of the two planar substrates are butted against each other, the inner cavity area forms a cavity structure 1001. A plurality of microchannels 10023 are arranged on the inner surface of the planar substrate 1002, and the microchannels can increase the contact area of ​​the material and improve the separation efficiency. The microchannel 10023 is a groove, and its design parameters can be selected from a width of 0.1 to 5 mm and a depth of 1 to 10 mm. In this embodiment, the microchannels are distributed in a tic-tac-toe shape.

[0050] In order to vaporize the liquid in the microchannel 10023 for gas-liquid separation, a heat source is required. The heat source plate 200 is attached to the outer side of the substrate 100; a heat medium chamber 300 is provided between the substrate 100 and the heat source plate 200, and the heat medium chamber 300 is filled with a heat medium for heat exchange to achieve heating of the material in the microchannel. The heat medium chamber 300 can be arranged on the outer side of the substrate 100, or on the inner side of the heat source plate 200. In this embodiment, it is arranged on the outer side of the substrate 100. In order to further improve the efficiency of heat exchange, the heat medium chamber 300 includes a plurality of heat medium channels 3001 connected end to end, and the running direction of the heat medium channel 3001 is perpendicular to the running direction of the microchannel 10023. The cross-sectional size of the heat medium channel can be selected from 1 to 10 mm × 5 to 20 mm. The heat source plate 200 is provided with a heat medium inlet and a heat medium outlet respectively connected to the heat source.

[0051] In this embodiment, a feed inlet 1003 and a steam outlet 1004 are provided at the upper part of the base 100, and a discharge port 1005 and a concentrated liquid outlet 1006 are provided at the lower part. Such an opening arrangement of the base 100 is beneficial to energy saving.

[0052] In specific applications, the feed port 1003 is connected to an external raw material supply pipeline to provide liquid. The steam outlet 1004 is connected to an external steam channel. The discharge port 1005 is connected to an external raw material supply pipeline. The concentrated liquid outlet 1006 is connected to an external concentrated liquid receiving channel.

[0053] The substrate 100 and the heat source plate 200 in this embodiment are both made of silicon carbide material. The heat source plate 200 is fixed around by bolts 400, so that the substrate 100 is clamped between the two heat source plates 200 to form a sealing structure.

[0054] Application Example 1

[0055] A flat plate reboiler is used for material concentration.

[0056] Specific:

[0057] See also Figure 1 The steam outlet 1004 of the substrate 100 is connected to the vacuum system to form a negative pressure in the cavity of the substrate 100 .

[0058] Application Example 2

[0059] A flat plate reboiler is used for material distillation separation.

[0060] Specific:

[0061] See also Figure 7As shown: the feed inlet 1003 of the matrix 100 is connected to the discharge port at the bottom of the distillation tower; the steam outlet 1004 of the matrix 100 is connected to the steam inlet at the bottom of the distillation tower; and the discharge port 1005 of the matrix is ​​connected to the material output channel.

[0062] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A microchannel reboiler, characterized in that: include: A substrate, and a heat source plate attached to the outside of the substrate; the substrate is composed of two planar substrates attached to each other, the planar substrates include an inner cavity and an edge surrounding the outer side of the inner cavity, and the inner cavity area forms a cavity structure when the edges of the two planar substrates are butted against each other; A plurality of microchannels are arranged on the inner surface of the planar substrate; A heat medium chamber is provided between the substrate and the heat source plate, and the heat medium chamber is filled with a heat medium for heat exchange so as to heat the material in the microchannel.

2. A microchannel reboiler according to claim 1, characterized in that: The heat medium chamber is arranged on the outer side surface of the base body, or on the inner side surface of the heat source plate.

3. A microchannel reboiler according to claim 1 or 2, characterized in that: The heat medium chamber comprises a plurality of heat medium channels which are connected end to end, and the running direction of the heat medium channels is perpendicular to the running direction of the microchannels.

4. A microchannel reboiler according to claim 1, characterized in that: A feed inlet and a steam outlet are arranged at the upper part of the base, and a discharge port and a concentrated liquid outlet are arranged at the lower part of the base.

5. The microchannel reboiler according to claim 1, characterized in that: The microchannel is a groove with a width of 0.1 to 5 mm and a depth of 1 to 10 mm.

6. The microchannel reboiler according to claim 1, characterized in that: The microchannels are distributed in a tic-tac-toe shape.

7. The microchannel reboiler according to claim 3, characterized in that: The cross-sectional size of the heat medium channel is 1-10 mm×5-20 mm.

8. The microchannel reboiler according to claim 1, characterized in that: The heat source plate is provided with a heat medium inlet and a heat medium outlet which are respectively connected with the heat source.

9. The microchannel reboiler according to claim 1, characterized in that: The heat source plates are in two pieces, which are respectively attached to the outer sides of the base body. The heat source plates are provided with mounting holes and are fixed by bolts.

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