A modular heat exchange system and a heat exchange network design method

Abstract

The present invention relates to the technical field of heat exchangers, and in particular to a modular heat exchange system and a heat exchange network design method, comprising: an n-stage heat exchange unit, wherein the n-stage heat exchange unit comprises two n-1-stage heat exchange units, n⩾2, and the two n-1-stage heat exchange units in the n-stage heat exchange unit comprise four connection methods; the present invention constructs the n-stage heat exchange unit through multiple heat exchange components, and determines the number of heat exchange components and the connection method between the heat exchange components according to actual heat exchange requirements, thereby reducing the difficulty of connecting multiple heat exchange core blocks, improving the efficiency and method of combining multiple heat exchange core blocks, being suitable for a variety of use scenarios, and being able to transform the heat exchange system according to different application requirements, being able to be widely used in the use environment of a microchannel heat exchanger, and having broad market application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular to a modular heat exchange system and a heat exchange network design method. Background Art

[0002] Heat exchangers are general process equipment for allocating energy between different logistics and completing heat transfer. They are widely used in a large number of industries such as power generation, chemical industry, power, metallurgy, etc., especially in power circulation systems with supercritical carbon dioxide as the working fluid. Heat exchangers play an important role in transferring and allocating energy between working fluids.

[0003] With the continuous improvement of science and technology, people pay more and more attention to the special application scenarios of power systems involved in nuclear power plants, thermal power plants, and aircraft engines. Reducing the size of equipment, improving efficiency, reducing equipment manufacturing and operating costs, and natural resource consumption are one of the future development directions of heat exchangers. At present, the heat exchangers used in conventional industrial fields mainly include shell and tube heat exchangers, sleeve and tube heat exchangers, plate heat exchangers, plate-fin heat exchangers, etc. They cannot simultaneously meet the requirements of large heat transfer specific surface area, high welding strength, and small size. In recent years, with the improvement of industrial manufacturing level, microchannel heat exchangers with high-precision chemical etching and vacuum diffusion welding as the core process have gradually entered the application stage. Their microchannels are small in size, highly compact, and the welding method has no welding slag. The strength of the joints is close to the strength of the parent material, which has obvious advantages. However, in the process of developing large-scale microchannel compact heat exchangers, it was found that due to process limitations, it was impossible to process a high-power microchannel heat exchanger in one piece. Multiple small-power microchannel heat exchangers had to be stacked and combined, connected as a whole by fusion welding and other methods, and then large-size heads were processed and welded. This not only increased the workload but also put forward high requirements on the spatial placement of the equipment. At the same time, this simple stacking heat exchange system design method is relatively simple and not flexible.

[0004] In view of this, the present invention proposes a modular connection system suitable for microchannel heat exchange core blocks and a core block combination design method, which provides a means for developing large and ultra-large microchannel compact heat exchangers. Summary of the invention

[0005] The technical problem to be solved by the present invention is that a single microchannel heat exchange core block is large in size and weight, and it is difficult to obtain the required large-size microchannel heat exchanger by direct processing. The purpose is to provide a modular heat exchange system and a heat exchange network design method, which realizes the simple and rapid connection of multiple microchannel heat exchange components.

[0006] The present invention is achieved through the following technical solutions:

[0007] A modular heat exchange system, comprising: an n-stage heat exchange unit, wherein the n-stage heat exchange unit comprises two n-1-stage heat exchange units, n⩾2, and the n-stage heat exchange unit is provided with a high-temperature side fluid inlet, a high-temperature side fluid outlet, a low-temperature side fluid inlet, and a low-temperature side fluid outlet; a flow channel between the high-temperature side fluid inlet and the high-temperature side fluid is set as a high-temperature flow channel, and a flow channel between the low-temperature side fluid inlet and the low-temperature side fluid outlet is set as a low-temperature flow channel;

[0008] The two n-1-stage heat exchange units in the n-stage heat exchange unit include 4 connection modes:

[0009] Method 1: The high-temperature flow channel of one n-1-stage heat exchange unit is connected in series with the high-temperature flow channel of another n-1-stage heat exchange unit, and the low-temperature flow channel of one n-1-stage heat exchange unit is connected in series with the low-temperature flow channel of another n-1-stage heat exchange unit;

[0010] Method 2: The high-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the high-temperature flow channel of another n-1-stage heat exchange unit, and the low-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the low-temperature flow channel of another n-1-stage heat exchange unit;

[0011] Method 3: The high-temperature flow channel of one n-1-stage heat exchange unit is connected in series with the high-temperature flow channel of another n-1-stage heat exchange unit, and the low-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the low-temperature flow channel of another n-1-stage heat exchange unit;

[0012] Method 4: The high-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the high-temperature flow channel of another n-1-stage heat exchange unit, and the low-temperature flow channel of one n-1-stage heat exchange unit is connected in series with the low-temperature flow channel of another n-1-stage heat exchange unit.

[0013] Specifically, the first-stage heat exchange unit is set as a heat exchange component, and the n-stage heat exchange unit includes a plurality of heat exchange components, a support component and a connection component, the plurality of heat exchange components are connected by the connection component, and the heat exchange components and the connection components are both fixed by the support component;

[0014] The connection assembly includes an inlet-outlet connection assembly and a transition connection assembly. The heat exchange assembly is connected to the outside through the inlet-outlet connection assembly, and the heat exchange assemblies are connected to each other through the transition connection assembly.

[0015] Optionally, the heat exchange component includes: a high-temperature side plate, a low-temperature side plate and a cover plate, the high-temperature side plate and the low-temperature side plate are periodically and alternately stacked between the two cover plates, the high-temperature side plate is provided with a plurality of high-temperature side flow channels, the low-temperature side plate is provided with a plurality of low-temperature side flow channels, the high-temperature side flow channels and the low-temperature side flow channels are not connected, the two ends of the high-temperature side flow channel are respectively the high-temperature side fluid inlet and the high-temperature side fluid outlet of the heat exchange component, and the two ends of the low-temperature side flow channel are respectively the low-temperature side fluid inlet and the low-temperature side fluid outlet.

[0016] Optionally, the connection assembly comprises: a cover and a sealing strip, the cover is attached to the high-temperature side fluid inlet, the high-temperature side fluid outlet, the low-temperature side fluid inlet or the low-temperature side fluid outlet of the heat exchange assembly, the sealing strip is arranged between the cover and the heat exchange assembly, and the cover is fixedly connected to the threaded ear on the heat exchange assembly by bolts and nuts;

[0017] The inlet and outlet connection assembly further includes: a pipe box and a pipe connection, the pipe connection is sealed and fixedly connected to the cover, and the pipe connection is connected to the pipe box;

[0018] The transition connection assembly further comprises: a connecting bridge, the two ends of which are respectively and sealedly fixedly connected to the two sealing covers.

[0019] Optionally, the connection assembly includes: a groove is provided on the cover, the sealing strip is provided in the groove, and the sealing strip is interference fit with the groove.

[0020] Optionally, the connection assembly comprises: the pipe box is a semi-cylindrical shell, the central opening of the pipe box is aligned concentrically with the connecting pipe and fixed by welding, and the rectangular end surface of the pipe box is adapted to the sealing cover and connected by welding;

[0021] The two rectangular end faces of the connecting bridge are aligned with the inner square holes of the two sealing covers and then welded together.

[0022] Optionally, the connection assembly includes: welding methods between the connecting pipe and the pipe box, between the pipe box and the cover, and between the connecting bridge and the cover include argon arc welding, brazing and / or ion welding;

[0023] The shape of the pipe box includes a tile-shaped, cylindrical or square shape, and the cross-sectional curve shape of the connecting bridge includes a parabola or a hyperbola.

[0024] A heat exchange network design method is used to determine the structure of a modular heat exchange system, the design method comprising:

[0025] Determine the required heat exchange area based on the design parameters of the heat exchange system ;

[0026] Determine the number of heat exchange components required based on the parameters of the heat exchange components ;

[0027] set up , and the connection method is method 1, and the actual outlet temperature and actual pressure drop under this structure are calculated;

[0028] If the actual pressure drop on the high temperature side exceeds the set value, the connection mode is changed to mode 4; if the actual pressure drop on the low temperature side exceeds the set value, the connection mode is changed to mode 3; if both the actual pressure drop on the high temperature side and the actual pressure drop on the low temperature side exceed the set value, the connection mode is changed to mode 2;

[0029] After changing to Mode 2, Mode 3 or Mode 4, recalculate the actual pressure drop. If the actual pressure drop still exceeds the set value, ;

[0030] right Perform iterative calculation until the actual pressure drop is lower than the set value;

[0031] Get the corresponding Values ​​and connections, and build The design is completed with a heat exchange unit.

[0032] Specifically, the heat exchange area Methods for determining include:

[0033] Determine the design parameters of the heat exchange system, including inlet temperature, outlet temperature, mass flow rate, inlet pressure and allowable pressure drop;

[0034] Calculate the total heat transfer ,in, for The specific heat capacity of the medium, for Mass flow rate of the medium, for The outlet temperature of the medium, for The inlet temperature of the medium, , For the high temperature side medium, It is the low temperature side medium;

[0035] Calculate the mean logarithmic temperature difference ,in, is the outlet temperature of the high temperature side medium, is the inlet temperature of the low temperature side medium, is the outlet temperature of the low temperature side medium, is the inlet temperature of the medium on the high temperature side;

[0036] Calculate the required heat exchange area ,in, is the overall heat transfer empirical coefficient of the heat exchanger, is the mean logarithmic temperature difference, is the total heat exchange.

[0037] Specifically, the number of heat exchange components Methods for determining include:

[0038] Obtain parameters of heat exchange components, including flow area , heat exchange area and flow length ;

[0039] Calculate the number of heat exchange components .

[0040] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0041] The present invention constructs an n-stage heat exchange unit through multiple heat exchange components, and determines the number of heat exchange components and the connection method between the heat exchange components according to actual heat exchange requirements, thereby reducing the difficulty of connecting multiple heat exchange core blocks and improving the efficiency and method of combining multiple heat exchange core blocks. It is suitable for a variety of usage scenarios, and the heat exchange system can be modified according to different application requirements. It can be widely used in the use environment of microchannel heat exchangers and has broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification and do not constitute a limitation of the embodiments of the present invention.

[0043] Figure 1 It is a structural schematic diagram of a modular heat exchange system according to the present invention.

[0044] Figure 2 It is a schematic diagram of the structure of two connection components of a modular heat exchange system according to the present invention.

[0045] Figure 3 It is a structural schematic diagram of a heat exchange component of a modular heat exchange system according to the present invention.

[0046] Figure 4 It is a connection logic diagram of a first-stage heat exchange unit, a second-stage heat exchange unit and a third-stage heat exchange unit of a modular heat exchange system according to the present invention.

[0047] Figure 5It is a connection diagram of a modular heat exchange system according to the first mode of the present invention.

[0048] Figure 6 It is a connection diagram of a second mode of a modular heat exchange system according to the present invention.

[0049] Figure 7 It is a connection diagram of mode 3 of a modular heat exchange system according to the present invention.

[0050] Figure 8 1 is a connection diagram of a fourth mode of a modular heat exchange system according to the present invention.

[0051] Fig. 9 It is a schematic flow chart of a heat exchange network design method according to the present invention.

[0052] Figure numerals, 1: heat exchange assembly, 2: connection assembly, 3: support assembly, I: inlet and outlet connection assembly, II: transition connection assembly, 11: heat exchange core block, 111: high temperature side plate, 1111: high temperature side flow channel, 112: low temperature side plate, 1121: low temperature side flow channel, 113: cover plate, 12: threaded ear, 21: sealing cover, 22: sealing strip, 23: bolts and nuts, 24: connecting pipe, 25: pipe box, 26: connecting bridge, 4: 1st stage heat exchange unit, 4': 2nd stage heat exchange unit, 4'': 3rd stage heat exchange unit. DETAILED DESCRIPTION

[0053] To make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific implementation methods described herein are only used to explain the relevant content, rather than to limit the present invention.

[0054] It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings.

[0055] In the absence of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0056] Embodiment 1

[0057] like Figure 1-8 As shown, a modular heat exchange system is provided, including: an n-stage heat exchange unit, the n-stage heat exchange unit includes two n-1-stage heat exchange units, n⩾2, when n=1, the 1-stage heat exchange unit 4 is the most basic heat exchange component 1, two heat exchange components 1 can constitute a 2-stage heat exchange unit 4', and two 2-stage heat exchange units 4' can constitute a 3-stage heat exchange unit 4''.

[0058] That is, the 3-stage heat exchange unit 4'' is a larger heat exchange subsystem composed of two 2-stage heat exchange units 4'. As we all know, fractal is usually defined as "a fragmented geometric shape that can be divided into several parts, and each part is a reduced shape of the whole", that is, it has the characteristic of "self-similarity". It can be seen that the 2-stage heat exchange unit 4' is the reduced shape of the 3-stage heat exchange unit 4''. Therefore, the heat exchange system has the characteristics of fractal geometry. It can be inferred that the 3-stage heat exchange unit 4'' has 4×4=16 structures and has different flow and heat transfer characteristics.

[0059] Therefore, it can be further inferred that the heat exchange system based on fractal thinking of the present invention has higher and larger heat exchange units, and can be infinitely deduced upward until the input flow heat exchange target is met, and the heat exchange system only consists of the heat exchange component 1 as the main component, and the connecting component 2 and the supporting component 3 as auxiliary components to complete the construction of the heat exchange system.

[0060] The entire n-stage heat exchange unit has only four inlets and outlets, that is, the n-stage heat exchange unit is provided with a high-temperature side fluid inlet, a high-temperature side fluid outlet, a low-temperature side fluid inlet and a low-temperature side fluid outlet; the flow channel between the high-temperature side fluid inlet and the high-temperature side fluid is set as the high-temperature flow channel, and the flow channel between the low-temperature side fluid inlet and the low-temperature side fluid outlet is set as the low-temperature flow channel;

[0061] There are four ways to connect two n-1-stage heat exchange units in an n-stage heat exchange unit:

[0062] like Figure 5 As shown, the first method of high temperature series connection-low temperature series connection is that the high temperature flow channel of one n-1 stage heat exchange unit is connected in series with the high temperature flow channel of another n-1 stage heat exchange unit, and the low temperature flow channel of one n-1 stage heat exchange unit is connected in series with the low temperature flow channel of another n-1 stage heat exchange unit;

[0063] like Figure 6 As shown, the second high-temperature parallel-low-temperature parallel mode: the high-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the high-temperature flow channel of another n-1-stage heat exchange unit, and the low-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the low-temperature flow channel of another n-1-stage heat exchange unit;

[0064] like Figure 7 As shown, the third method of high temperature series-low temperature parallel connection is that the high temperature flow channel of one n-1 stage heat exchange unit is connected in series with the high temperature flow channel of another n-1 stage heat exchange unit, and the low temperature flow channel of one n-1 stage heat exchange unit is connected in parallel with the low temperature flow channel of another n-1 stage heat exchange unit;

[0065] like Figure 8As shown, the fourth method of high-temperature parallel connection and low-temperature series connection is that the high-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the high-temperature flow channel of another n-1-stage heat exchange unit, and the low-temperature flow channel of one n-1-stage heat exchange unit is connected in series with the low-temperature flow channel of another n-1-stage heat exchange unit.

[0066] Embodiment 2

[0067] like Figure 1 , Figure 2 and Figure 3 As shown, the 1st-stage heat exchange unit 4 is set as the heat exchange component 1, and the nth-stage heat exchange unit includes multiple heat exchange components 1, a support component 3 and a connection component 2. The multiple heat exchange components 1 are connected by the connection component 2, and the heat exchange components 1 and the connection components 2 are both fixed by the support component 3; the heat exchange component 1 completes the flow heat exchange between multiple working fluids, the connection component 2 uses different joints to connect multiple heat exchange components 1, and the support component 3 is responsible for fixing and stabilizing the entire system.

[0068] The heat exchange component 1 consists of a heat exchange core block 11 and a threaded ear 12, wherein the former is a microchannel heat exchange core block 11 obtained by chemical etching and vacuum diffusion welding, which is generally a rectangular parallelepiped, leaving four positions for inlet and outlet on both sides of the hot and cold sides for fluid to enter or flow out, and the threaded ear 12 is a machined accessory, and a hole is drilled and tapped at the center hole position, and the threaded ear 12 is welded to the upper and lower sections corresponding to each inlet and outlet position of the heat exchange core block 11 for subsequent connection.

[0069] The connection component 2 includes an inlet-outlet connection component I and a transition connection component II. The heat exchange component 1 is connected to the outside through the inlet-outlet connection component I, and the heat exchange components 1 are connected to each other through the transition connection component II.

[0070] The connection assembly 2 is structurally divided into two types: an inlet and outlet connection assembly I and a transition connection assembly II. The former is responsible for guiding the working fluid into or out of the heat exchange core block 11 through the pipe box 25 and the pipe 24; the latter guides the working fluid from the previous heat exchange core block 11 directly into the next one through the connecting bridge 26.

[0071] The connection component 2 includes: a cover 21 and a sealing strip 22. The cover 21 is attached to the high-temperature side fluid inlet, high-temperature side fluid outlet, low-temperature side fluid inlet or low-temperature side fluid outlet of the heat exchange component 1. The sealing strip 22 is arranged between the cover 21 and the heat exchange component 1, and the cover 21 is fixedly connected to the threaded ear 12 on the heat exchange component 1 through bolts and nuts 23; the cover 21 is a rectangular frame with a threaded ear 12, and a circle of grooves are machined on the cover 21 for installing the sealing strip 22. The sealing strip 22 forms an interference fit in the groove and plays a sealing role when installed with the heat exchange component 1.

[0072] The inlet and outlet connection assembly I also includes: a pipe box 25 and a pipe 24, the pipe 24 is sealed and fixedly connected to the cover 21, and the pipe 24 is connected to the pipe box 25; the pipe box 25 is a semi-cylindrical shell, which is concentrically aligned with the pipe 24 and welded after the center hole is opened, and then the rectangular end face of the pipe box 25 is aligned with the cover 21, and the inlet and outlet connection assembly I is formed by welding.

[0073] The transition connection component II also includes: a connecting bridge 26, the two ends of which are sealed and fixedly connected to the two covers 21 respectively. The connecting bridge 26 has rectangular cross-sections at both ends and a shell with a smooth transition using a spline curve in the middle. The transition connection component II can be formed by aligning the two rectangular end faces of the connecting bridge 26 with the square holes inside the two covers 21 and then welding them.

[0074] The heat exchange component 1 includes: a high-temperature side plate 111, a low-temperature side plate 112 and a cover plate 113. The high-temperature side plate 111 and the low-temperature side plate 112 are periodically and alternately stacked between the two cover plates 113. A plurality of high-temperature side flow channels 1111 are arranged on the high-temperature side plate 111, and a plurality of low-temperature side flow channels 1121 are arranged on the low-temperature side plate 112. The high-temperature side flow channels 1111 and the low-temperature side flow channels 1121 are not connected. The two ends of the high-temperature side flow channel 1111 are respectively the high-temperature side fluid inlet and the high-temperature side fluid outlet of the heat exchange component 1, and the two ends of the low-temperature side flow channel 1121 are respectively the low-temperature side fluid inlet and the low-temperature side fluid outlet.

[0075] The high temperature side plate 111 and the low temperature side plate 112 are alternately arranged in a certain periodicity, and have high temperature side flow channels 1111 and low temperature side flow channels 1121 processed by chemical etching or mechanical processing for fluid flow and heat exchange on both sides.

[0076] The support assembly 3 is composed of a variety of modular profiles, and the profiles are connected by splicing similar to the mortise and tenon structure and fixed by joints to achieve the support function for the heat exchange core block 11.

[0077] When connecting, bolts and nuts 23 are passed through the corresponding threaded ears 12 of the two components and then tightened to connect. At the same time, the compressed sealing strip 22 will form a seal after deformation to ensure that the working fluid does not leak out; the support component 3 is wrapped and supported according to the size of each heat exchange component 1, and the connecting pipe 24 is designed according to the heat exchange core combination to connect the inlet and outlet pipe boxes 25 of the working fluid on the same side. Finally, a complete and stable microchannel heat exchange core block 11 connection system is formed, and the components are mechanically connected, which can be quickly modified according to actual needs.

[0078] like Figure 4As shown, first, the first-stage heat exchange unit 4 is the heat exchange component 1, which has only four external interfaces, namely the high-temperature side fluid inlet / outlet (a / A) and the low-temperature side fluid inlet / outlet (b / B). The fluids on both sides can exchange heat in the reverse or same direction according to different flow directions. Figure 4 The two arrows are drawn vertically only for the convenience of later identification, that is, the high-temperature side fluid enters and exits the heat exchanger horizontally and the low-temperature side fluid enters and exits the heat exchanger vertically, and does not represent the actual flow and heat exchange direction. In a heat exchange system, the structure and flow direction of the first-stage heat exchange unit 4 must be clarified first, and then all first-stage heat exchange units 4 must be consistent. Here, the flow direction of the first-stage heat exchange unit is set as countercurrent heat exchange.

[0079] Some detailed structure is provided below.

[0080] The material of the connection component 2 and the heat exchange component 1 is not only stainless steel, but also metal materials such as carbon steel, nickel-based alloy, titanium alloy and non-metallic materials such as ceramics. The support component 3 can be made of light alloy materials including but not limited to aluminum alloy, titanium alloy and the like.

[0081] The connection assembly 2 includes: welding methods between the connecting pipe 24 and the pipe box 25, between the pipe box 25 and the cover 21, and between the connecting bridge 26 and the cover 21 include argon arc welding, brazing and / or ion welding.

[0082] The shape of the pipe box 25 includes a tile-shaped, cylindrical or square shape, and the cross-sectional curve shape of the bridge 26 includes a parabola or a hyperbola.

[0083] The thickness of the sealing strip 22 of the connecting component 2 is about 5 mm, and the material includes thermal insulation materials such as ceramics and asbestos, and the cross-sectional shape of the thermal insulation strip may include different geometric shapes such as rectangle, square, semicircle, etc.

[0084] The flow channel plate of the heat exchange core can be a plate with tiny channels produced by various processes including but not limited to chemical etching, optical etching, mechanical stamping, etc., and the size and shape of the flow channel plate and the flow channel are not specified.

[0085] The heat exchange core is formed by stacking a large number of flow channel plates and then undergoing vacuum diffusion welding. Other welding methods that can form the heat exchange core in one piece include vacuum brazing and other welding methods.

[0086] The thickness of the threaded lifting ear 12 is not fixed, generally in the range of 2-20 mm, and the shape is not fixed, as long as it can play the function of lifting and transportation and connection of the bolt and nut 23.

[0087] The thickness of the cover 21 is not fixed, generally in the range of 2-20 mm, and the cross-sectional dimensions are consistent with the heat exchange core and the threaded ear 12. The spacing between the two covers 21 of the transition connection assembly II is not specified.

[0088] Meanwhile, the connection methods between the multiple heat exchange core blocks 11 include but are not limited to: Figures 5 to 8 The four methods shown can be used as long as the pipe box 25 can be connected using the pipe 24 and the tee.

[0089] The number of the first-stage heat exchange units 4 included in the second-stage heat exchange unit 4' is not limited to two in the present embodiment, but may be any natural number greater than two.

[0090] Embodiment 3

[0091] The structural parameters of the 1st-stage heat exchange unit and the 2nd-stage heat exchange unit are shown in the following table. It can be found that the structural parameters of the working fluids on both sides of the 2nd-stage heat exchange unit with different configurations are different, so they have different flow and heat transfer characteristics. Different configurations can be selected according to different needs during the design process.

[0092] According to the present invention, the four connection modes in the second-stage heat exchange unit 4' correspond to Figure 5-Figure 8 Implementation method.

[0093] Based on the above structural parameters, such as Fig. 9 As shown, a heat exchange network design method is provided for determining the structure of a modular heat exchange system, the design method comprising:

[0094] The first step is to determine the required heat exchange area based on the design parameters of the heat exchange system. ; Heat exchange area Methods for determining include:

[0095] Determine the design parameters of the heat exchange system, including inlet temperature, outlet temperature, mass flow rate, inlet pressure and allowable pressure drop;

[0096] Determine the design parameters of the heat exchange system, including inlet temperature, outlet temperature, mass flow rate, inlet pressure and allowable pressure drop;

[0097] Calculate the total heat transfer ,in, for The specific heat capacity of the medium, for Mass flow rate of the medium, for The outlet temperature of the medium, for The inlet temperature of the medium, , For the high temperature side medium, It is the low temperature side medium;

[0098] Calculate the mean logarithmic temperature difference ,in, is the outlet temperature of the high temperature side medium, is the inlet temperature of the low temperature side medium, is the outlet temperature of the low temperature side medium, is the inlet temperature of the medium on the high temperature side;

[0099] Calculate the required heat exchange area ,in, is the overall heat transfer empirical coefficient of the heat exchanger, is the mean logarithmic temperature difference, is the total heat transfer, in actual calculation and are equal, so any value calculation is acceptable.

[0100] The second step is to determine the number of heat exchange components required based on the parameters of the heat exchange components. ; Number of heat exchange components Methods for determining include:

[0101] According to the current processing technology level of chemical etching and vacuum diffusion welding, the size of the heat exchange component and the size of the microchannel are obtained, and the flow area of ​​the working fluid on both sides can be calculated accordingly. , heat exchange area and flow length ;

[0102] Calculate the number of heat exchange components .

[0103] Step 3: Set , and the connection method is method 1, and the actual outlet temperature and actual pressure drop under this structure are calculated;

[0104] Step 4: If the actual pressure drop on the high temperature side exceeds the set value, the connection mode is changed to mode 4; if the actual pressure drop on the low temperature side exceeds the set value, the connection mode is changed to mode 3; if both the actual pressure drop on the high temperature side and the actual pressure drop on the low temperature side exceed the set value, the connection mode is changed to mode 2;

[0105] All the two-stage heat exchange units are initially configured in high-temperature series-low-temperature series 4'1 configuration, and the high / low temperature side flow area of ​​the entire heat exchange system is S f,i , the heat exchange area is n*S h,i , the flow length is n*L i. Calculate the outlet temperature and pressure drop of the working fluid under this structure. If the outlet temperature does not meet the input requirements (that is, the heat exchange area is too small), add a 2-stage heat exchange unit. If the pressure drop of the working fluid on the high temperature side does not meet the input requirements (that is, the pressure drop is too large), change a 2-stage heat exchange unit to a high temperature parallel-low temperature series 4'4 configuration. If the pressure drop of the working fluid on the low temperature side does not meet the input requirements (that is, the pressure drop is too large), change a 2-stage heat exchange unit to a high temperature series-low temperature parallel 4'3 configuration. If the pressure drop of the working fluid on both sides does not meet the input requirements (that is, the pressure drop is too large), change a 2-stage heat exchange unit to a high temperature parallel-low temperature parallel 4'2 configuration. Repeat the cycle until all requirements are met.

[0106] Step 5: After changing to Mode 2, Mode 3 or Mode 4, recalculate the actual pressure drop. If the actual pressure drop still exceeds the set value, set ;right Perform iterative calculation until the actual pressure drop is lower than the set value; obtain the corresponding Values ​​and connections, and build The design is completed with a heat exchange unit.

[0107] If all possibilities are calculated and it is found that the requirements are still not met, it means that the design accuracy of the heat exchange system is insufficient. Therefore, return to the third step and increase the maximum number of heat exchange unit levels by one. Design based on the three-level heat exchange unit and repeat the fourth step. In this way, as the accuracy of the heat exchange system continues to increase, a heat exchange system that meets the design requirements can be obtained.

[0108] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0109] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0110] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above invention, and these changes or modifications are still within the scope of the present invention.

Claims

1. A modular heat exchange system, characterized in that: include: n-stage heat exchange unit, the n-stage heat exchange unit includes two n-1-stage heat exchange units, n⩾2, the n-stage heat exchange unit is provided with a high-temperature side fluid inlet, a high-temperature side fluid outlet, a low-temperature side fluid inlet and a low-temperature side fluid outlet; the flow channel between the high-temperature side fluid inlet and the high-temperature side fluid is set as the high-temperature flow channel, and the flow channel between the low-temperature side fluid inlet and the low-temperature side fluid outlet is set as the low-temperature flow channel; The first-stage heat exchange unit (4) is set as a heat exchange component (1), the n-stage heat exchange unit comprises a plurality of heat exchange components (1), a support component (3) and a connection component (2), the plurality of heat exchange components (1) are connected via the connection component (2), and the heat exchange component (1) and the connection component (2) are both fixed via the support component (3); The connection assembly (2) comprises an inlet and outlet connection assembly (I) and a transition connection assembly (II), the heat exchange assembly (1) is connected to the outside via the inlet and outlet connection assembly (I), and the heat exchange assemblies (1) are connected to each other via the transition connection assembly (II); The heat exchange component (1) comprises: a high-temperature side plate (111), a low-temperature side plate (112) and a cover plate (113); the high-temperature side plate (111) and the low-temperature side plate (112) are periodically and alternately stacked between two cover plates (113); a plurality of high-temperature side flow channels (1111) are provided on the high-temperature side plate (111); a plurality of low-temperature side flow channels (1121) are provided on the low-temperature side plate (112); the high-temperature side flow channels (1111) and the low-temperature side flow channels (1121) are not connected; two ends of the high-temperature side flow channels (1111) are respectively a high-temperature side fluid inlet and a high-temperature side fluid outlet of the heat exchange component (1); and two ends of the low-temperature side flow channels (1121) are respectively a low-temperature side fluid inlet and a low-temperature side fluid outlet; The two n-1-stage heat exchange units in the n-stage heat exchange unit include four connection modes, and the number of heat exchange components (1) and the connection mode between the heat exchange components (1) are determined according to actual heat exchange requirements: Method 1: The high-temperature flow channel of one n-1-stage heat exchange unit is connected in series with the high-temperature flow channel of another n-1-stage heat exchange unit, and the low-temperature flow channel of one n-1-stage heat exchange unit is connected in series with the low-temperature flow channel of another n-1-stage heat exchange unit; Method 2: The high-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the high-temperature flow channel of another n-1-stage heat exchange unit, and the low-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the low-temperature flow channel of another n-1-stage heat exchange unit; Method 3: The high-temperature flow channel of one n-1-stage heat exchange unit is connected in series with the high-temperature flow channel of another n-1-stage heat exchange unit, and the low-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the low-temperature flow channel of another n-1-stage heat exchange unit; Method 4: The high-temperature flow channel of one n-1-stage heat exchange unit is connected in parallel with the high-temperature flow channel of another n-1-stage heat exchange unit, and the low-temperature flow channel of one n-1-stage heat exchange unit is connected in series with the low-temperature flow channel of another n-1-stage heat exchange unit.

2. A modular heat exchange system according to claim 1, characterized in that: The connection assembly (2) comprises: a sealing cover (21) and a sealing strip (22); the sealing cover (21) is attached to a high-temperature side fluid inlet, a high-temperature side fluid outlet, a low-temperature side fluid inlet or a low-temperature side fluid outlet of the heat exchange assembly (1); the sealing strip (22) is arranged between the sealing cover (21) and the heat exchange assembly (1); and the sealing cover (21) is fixedly connected to a threaded lifting ear (12) on the heat exchange assembly (1) by means of bolts and nuts (23); The inlet and outlet connection assembly (I) further comprises: a pipe box (25) and a pipe connection (24), wherein the pipe connection (24) is sealed and fixedly connected to the cover (21), and the pipe connection (24) is connected to the pipe box (25); The transition connection assembly (II) further comprises: a connecting bridge (26), wherein two ends of the connecting bridge (26) are respectively and sealedly fixedly connected to the two sealing covers (21).

3. A modular heat exchange system according to claim 2, characterized in that: The connection assembly (2) comprises: the sealing cover (21) is provided with a groove, the sealing strip (22) is arranged in the groove, and the sealing strip (22) is interference-fitted with the groove.

4. A modular heat exchange system according to claim 2, characterized in that: The connection assembly (2) comprises: the pipe box (25) is a semi-cylindrical shell, the central opening of the pipe box (25) is aligned concentrically with the connecting pipe (24) and fixed by welding, and the rectangular end surface of the pipe box (25) is adapted to the sealing cover (21) and is welded to the sealing cover (21); The two rectangular end faces of the connecting bridge (26) are aligned with the inner square holes of the two sealing covers (21) and then welded together.

5. A modular heat exchange system according to claim 4, characterized in that: The connection assembly (2) comprises: the welding methods between the connecting pipe (24) and the pipe box (25), between the pipe box (25) and the cover (21), and between the connecting bridge (26) and the cover (21) include argon arc welding, brazing and / or ion welding; The shape of the pipe box (25) includes a tile-shaped, cylindrical or square shape, and the cross-sectional curve shape of the connecting bridge (26) includes a parabola or a hyperbola.

6. A heat exchange network design method, characterized in that: For determining the structure of a modular heat exchange system as claimed in any one of claims 1 to 5, the design method comprises: Determine the required heat exchange area based on the design parameters of the heat exchange system ; Determine the number of heat exchange components required based on the parameters of the heat exchange components ; set up , and the connection method is method 1, and the actual outlet temperature and actual pressure drop under this structure are calculated; If the actual pressure drop on the high temperature side exceeds the set value, the connection mode is changed to mode 4; if the actual pressure drop on the low temperature side exceeds the set value, the connection mode is changed to mode 3; if both the actual pressure drop on the high temperature side and the actual pressure drop on the low temperature side exceed the set value, the connection mode is changed to mode 2; After changing to Mode 2, Mode 3 or Mode 4, recalculate the actual pressure drop. If the actual pressure drop still exceeds the set value, ; right Perform iterative calculation until the actual pressure drop is lower than the set value; Get the corresponding Values ​​and connections, and build The design is completed with a heat exchange unit.

7. A heat exchange network design method according to claim 6, characterized in that: Heat exchange area Methods for determining include: Determine the design parameters of the heat exchange system, including inlet temperature, outlet temperature, mass flow rate, inlet pressure and allowable pressure drop; Calculate the total heat transfer ,in, for The specific heat capacity of the medium, for Mass flow rate of the medium, for The outlet temperature of the medium, for The inlet temperature of the medium, , For the high temperature side medium, It is the low temperature side medium; Calculate the mean logarithmic temperature difference ,in, is the outlet temperature of the high temperature side medium, is the inlet temperature of the low temperature side medium, is the outlet temperature of the low temperature side medium, is the inlet temperature of the medium on the high temperature side; Calculate the required heat exchange area ,in, is the overall heat transfer empirical coefficient of the heat exchanger, is the mean logarithmic temperature difference, is the total heat exchange.

8. A heat exchange network design method according to claim 7, characterized in that: Number of heat exchange components Methods for determining include: Obtain parameters of heat exchange components, including flow area , heat exchange area and flow length ; Calculate the number of heat exchange components .

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