Composite microchannel reactor integrated with distributed temperature detection

Abstract

This invention discloses a composite microchannel reactor with integrated distributed temperature detection, comprising a reaction layer, a sealing layer, and a heat exchange layer stacked together, as well as a temperature detection component. The reaction layer has reaction microchannels, the sealing layer is disposed between the reaction layer and the heat exchange layer, and the heat exchange layer has heat exchange channels that exchange heat with the reaction microchannels. The temperature detection component includes multiple temperature detection points distributed along the extension direction of the reaction microchannels, each temperature detection point forming a thermally conductive coupling with a different location within the reaction microchannels. Preferably, the reaction layer, sealing layer, and heat exchange layer are made of silicon carbide, expanded polytetrafluoroethylene (ePTFE), and stainless steel, respectively, and the temperature detection component employs a fiber Bragg grating temperature sensor array. This invention can balance the reactor's corrosion resistance, sealing, and heat exchange performance, and achieve temperature detection at different locations along the reaction microchannels, making it particularly suitable for highly exothermic and corrosive continuous reactions such as continuous diazotization.

Description

Technical Field

[0001] This invention relates to the field of continuous flow microreactor technology, and more specifically to a composite microchannel reactor with integrated distributed temperature detection. Background Technology

[0002] Microchannel reactors possess advantages such as short heat transfer distance, large specific surface area, high mixing efficiency, and ease of continuous operation, making them suitable for continuous chemical reaction processes with fast reaction rates and strong exothermic effects. Particularly in continuous diazotization reactions, aromatic primary amines react rapidly with nitrites in acidic media to form diazonium salts. This reaction process is significantly exothermic, and the diazonium salts exhibit poor thermal stability. When localized material ratio fluctuations, uneven mixing, or insufficient heat exchange occur, localized hot spots can easily form, potentially leading to diazonium salt decomposition and increased pressure. Existing materials indicate that the diazotization reaction itself can be completed in milliseconds to seconds with a high temperature rise rate, thus placing high demands on the reactor's heat exchange capacity and temperature detection response capabilities.

[0003] Existing microchannel reactors, when used for highly exothermic and corrosive reactions such as continuous diazotization, still face the challenge of balancing corrosion resistance, heat transfer performance, structural strength, and manufacturing cost. For example, while stainless steel and other metallic materials possess good mechanical strength and processing properties, they are prone to corrosion under prolonged use in acidic and oxidizing media. Although corrosion-resistant materials such as silicon carbide offer good corrosion resistance and thermal conductivity, their overall processing, connection, and manufacturing costs are relatively high. Existing materials also list the difficulty in balancing corrosion resistance and thermal conductivity as one of the problems existing in continuous diazotization microchannel equipment.

[0004] On the other hand, the reaction space inside microchannels is small and the reaction process is continuous. When a local area experiences a temperature rise due to changes in the reaction rate or abnormal heat transfer, simply placing temperature sensing elements at the reactor inlet and outlet is insufficient to accurately reflect the temperature distribution at different locations within the microchannel and hinders the timely detection of localized hot spots. Directly inserting traditional temperature sensors into the microchannel may affect the flow field within the narrow channel and increase the difficulty of sealing and corrosion resistance design. Existing materials clearly indicate that traditional single-point temperature sensors cannot cover the entire reaction channel, resulting in the problem of difficulty in real-time detection of localized hot spots.

[0005] Therefore, it is necessary to provide a composite microchannel reactor that allows the reaction flow path, sealing structure, and heat exchange structure to adopt appropriate structures and materials according to different functional requirements. At the same time, it is necessary to detect the temperature status at different locations along the reaction microchannel without significantly interfering with the internal flow field of the reaction microchannel, so as to improve the corrosion resistance, heat exchange, and local temperature monitoring capabilities of existing microchannel reactors in highly exothermic and corrosive reactions such as continuous diazotization. Summary of the Invention

[0006] The purpose of this invention is to provide a composite microchannel reactor with integrated distributed temperature detection to solve the problems of existing microchannel reactors in which it is difficult to balance corrosion resistance, heat exchange performance and structural reliability when used for strong exothermic and corrosive reactions such as continuous diazotization, as well as the difficulty in obtaining the temperature status at different positions along the reaction microchannel.

[0007] The technical solution provided by this invention is as follows:

[0008] A composite microchannel reactor with integrated distributed temperature detection includes a reaction layer, a sealing layer and a heat exchange layer stacked together, as well as a temperature detection component; A sealing layer is positioned between the reaction layer and the heat exchange layer; The reaction layer is provided with reaction microchannels for the flow of reactants and for the reaction to occur. The sealing layer is adapted to the contour of the reaction microchannels to seal the space between the reaction layer and the heat exchange layer. The heat exchange layer is provided with heat exchange channels for the flow of heat exchange medium, and the heat exchange channels form a heat exchange relationship with the reaction microchannels; The temperature detection component includes multiple temperature detection points distributed along the extension direction of the reaction microchannel, and the multiple temperature detection points form thermally conductive coupling with different positions of the reaction microchannel.

[0009] Optionally, the reaction layer is made of silicon carbide, the sealing layer is made of expanded polytetrafluoroethylene, and the heat exchange layer is made of stainless steel.

[0010] Optionally, the reaction microchannel extends in a serpentine or spiral shape, and the turning points of the reaction microchannel are provided with flow-guiding rounded corners.

[0011] Optionally, the temperature detection component includes a fiber Bragg grating temperature sensor array, which includes multiple fiber Bragg gratings spaced apart along the extension direction of the reaction microchannel, with each fiber Bragg grating forming a temperature detection point.

[0012] Optionally, the reaction layer is provided with a sensing groove extending along the reaction microchannel, the sensing groove is disposed on one side of the reaction microchannel, and the fiber Bragg grating temperature sensor array is disposed in the sensing groove.

[0013] Optionally, adjacent fiber Bragg gratings are spaced 5 to 20 mm apart along the extension direction of the reaction microchannel, and the fiber Bragg grating temperature sensor array includes 6 to 30 temperature detection points.

[0014] Optionally, the fiber Bragg grating temperature sensor array is extended from the side of the reaction layer and connected to a wavelength demodulator located outside the composite microchannel reactor.

[0015] Optionally, the heat exchange channels and reaction microchannels are arranged in a cross-flow manner so that the heat exchange medium flowing through the heat exchange channels and the reactants flowing through the reaction microchannels form a cross-flow heat exchange.

[0016] Optionally, the reaction layer and the sealing layer are connected by hot pressing, and the sealing layer and the heat exchange layer are connected by fasteners.

[0017] Optionally, the distance between the sensing groove and the reaction microchannel is 0.3 to 0.5 mm, and the fiber Bragg grating temperature sensor array is fixed to the reaction layer by a fixing material filled in the sensing groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention forms a stacked composite structure by means of a reaction layer, a sealing layer and a heat exchange layer, so that the flow path of the reactant material, the interlayer sealing and the flow path of the heat exchange medium are respectively undertaken by the corresponding structural layers, which is beneficial to take into account the corrosion resistance, sealing performance, heat exchange performance and structural reliability of the reactor. At the same time, multiple temperature detection points are integrated and set along the extension direction of the reaction microchannel, so that different temperature detection points correspond to different positions of the reaction microchannel. Compared with temperature detection only at the reactor inlet or outlet, more complete temperature information along the reaction microchannel can be obtained, which is beneficial to timely detection of local temperature anomalies.

[0019] (2) The present invention uses a fiber Bragg grating temperature sensor array and sets it in the sensing groove next to the reaction microchannel, so that the temperature detection component does not need to be directly inserted into the reaction microchannel to detect the temperature at different positions along the process, thereby reducing the influence of the temperature detection structure on the flow field of the reaction material and the sealing performance of the reaction microchannel. It is especially suitable for continuous reaction processes such as continuous diazotization with fast reaction rate, concentrated heat release and corrosive reaction medium. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the reaction layer structure of the present invention; Figure 2 This is a schematic diagram of the main structure of the present invention; Figure 3 This is a side view of the structure of the present invention; Figure 4 This is a schematic diagram of the heat exchange layer structure of the present invention.

[0021] The attached figures are labeled as follows: 1. Reaction layer; 2. Temperature detection component; 3. Sealing layer; 4. Heat exchange layer; 5. Reaction microchannel; 6. Heat exchange channel; 7. Temperature detection point; 8. Optical fiber. Detailed Implementation

[0022] To illustrate in detail the technical solutions adopted by the present invention to achieve the intended technical objectives, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Furthermore, the technical means or technical features in the embodiments of the present invention can be replaced without creative effort. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 4 As shown, this embodiment provides a composite microchannel reactor with integrated distributed temperature detection, including a reaction layer 1, a sealing layer 3, and a heat exchange layer 4 stacked together, as well as a temperature detection component 2. In the illustrated installation state, the reaction layer 1 is located at the bottom, the sealing layer 3 is located between the reaction layer 1 and the heat exchange layer 4, and the heat exchange layer 4 is located at the top, with the three layers stacked together to form the composite microchannel reactor.

[0024] The composite microchannel reactor of this embodiment can be used for strongly exothermic and corrosive continuous reactions, and is particularly suitable for the continuous diazotization reaction of aromatic primary amines. In the continuous diazotization reaction, the aromatic primary amine, nitrite, and acidic medium are continuously mixed and undergo diazotization within the reaction microchannel 5. The heat exchange channel 6 is used for heat exchange and temperature control during the reaction process, and the temperature detection component 2 is used to acquire temperature information at different locations along the reaction microchannel 5.

[0025] The reaction layer 1 is used to form a reaction zone for the flow of reactants and for the reaction to occur. The reaction layer 1 is provided with reaction microchannels 5, which have reactant inlets and reactant outlets. The reactants enter the reaction microchannels 5 through the reactant inlets and flow continuously along the reaction microchannels 5. After the reaction occurs during the flow, the reactants are discharged through the reactant outlets.

[0026] In this embodiment, the reaction layer 1 is made of silicon carbide. Silicon carbide has good corrosion resistance and thermal conductivity, making it suitable for acidic or oxidizing reaction media. The reaction microchannels 5 can be formed by laser etching or reactive ion etching.

[0027] The cross-section of the reaction microchannel 5 can be rectangular, trapezoidal, or other cross-sectional structures suitable for continuous flow reactions. Preferably, the reaction microchannel 5 extends in a serpentine or spiral shape to form a longer flow path for the reactants within the limited area of ​​the reaction layer 1. For the serpentine reaction microchannel 5, adjacent channel segments are connected by turning sections, which preferably adopt a circular arc transition structure to reduce local stagnation or dead zones in the reactants in the turning areas.

[0028] In one specific embodiment, the thickness of the reaction layer 1 is 1-2 mm, the width of the reaction microchannel 5 is 0.5-2 mm, the depth is 0.5-1.5 mm, the total length is 0.5-3 m, and the radius of the guide fillet at the bend of the reaction microchannel 5 is not less than twice the width of the reaction microchannel 5.

[0029] The sealing layer 3 is disposed between the reaction layer 1 and the heat exchange layer 4 to achieve a seal between the reaction layer 1 and the heat exchange layer 4, and to isolate the flow path of the reactant material from the flow path of the heat exchange medium.

[0030] In this embodiment, the sealing layer 3 is made of expanded polytetrafluoroethylene (ePTFE). ePTFE has good resistance to acid and oxidation media, as well as a certain degree of compressive deformation. When the reaction layer 1, the sealing layer 3, and the heat exchange layer 4 are pressed together, the sealing layer 3 can adapt to local dimensional errors on the surfaces of adjacent layers, thereby improving the reliability of interlayer sealing.

[0031] The sealing layer 3 has a contour structure corresponding to the reaction microchannel 5. In one specific embodiment, the sealing layer 3 is made of expanded polytetrafluoroethylene film with a thickness of 0.1 to 0.3 mm, and the contour structure is formed by laser cutting to match the reaction layer 1.

[0032] The heat exchange layer 4 is located on the side of the sealing layer 3 facing away from the reaction layer 1. The heat exchange layer 4 is provided with heat exchange channels 6 for the flow of heat exchange medium, and the heat exchange channels 6 form a heat exchange relationship with the reaction microchannels 5. When the heat exchange medium flows through the heat exchange channels 6, it exchanges heat with the reactants in the reaction microchannels 5 to regulate the temperature of the reaction process.

[0033] In this embodiment, the heat exchange layer 4 is made of 316L stainless steel. Stainless steel has good mechanical strength and processing properties, and can be used to form the heat exchange channel 6 and provide structural support for the composite microchannel reactor.

[0034] Preferably, the heat exchange channel 6 and the reaction microchannel 5 are arranged intersectingly. Specifically, when a local channel segment of the reaction microchannel 5 extends along the first direction, the heat exchange channel 6 corresponding to that local channel segment extends along the second direction intersecting the first direction, so that the heat exchange medium flowing through the heat exchange channel 6 and the reactant flowing through the reaction microchannel 5 form cross-flow heat exchange, thereby exchanging heat in multiple areas along the reaction microchannel 5.

[0035] In one specific embodiment, the thickness of the heat exchange layer 4 is 2-5 mm, and the width and depth of the heat exchange channel 6 are 1-2 mm and 1-2 mm, respectively. The heat exchange medium can be a mixture of ethylene glycol and water, and the temperature and flow rate of the heat exchange medium can be adjusted according to the temperature range required for the specific reaction. The liquid outlet device and power device of the heat exchange channel 6 are located outside the reactor, which will not be described in detail in this application.

[0036] After the reaction layer 1, sealing layer 3 and heat exchange layer 4 are stacked, the reaction layer 1 mainly forms the reaction flow path that comes into contact with the reactants, the sealing layer 3 is used to achieve interlayer sealing and isolation, and the heat exchange layer 4 mainly forms the heat exchange medium flow path and provides structural support, thereby enabling different structural layers to undertake corresponding functions.

[0037] In one specific connection method, the reaction layer 1 and the sealing layer 3 are connected by hot pressing, and the sealing layer 3 and the heat exchange layer 4 are connected by fasteners. For example, the reaction layer 1 and the sealing layer 3 can be hot-pressed at 200-250°C and 1-3 MPa, and the reaction layer 1, the sealing layer 3 and the heat exchange layer 4 are pressed and fixed by bolts arranged at intervals around the periphery of the composite microchannel reactor.

[0038] To obtain temperature information at different locations along the reaction microchannel 5, this embodiment includes a temperature detection component 2. The temperature detection component 2 includes multiple temperature detection points distributed along the extension direction of the reaction microchannel 5, each temperature detection point corresponding to a different location in the reaction microchannel 5 and forming a thermally conductive coupling with the corresponding location.

[0039] With the above settings, the temperature detection component 2 can acquire temperature information at different locations such as the inlet area, intermediate reaction area and outlet area of ​​the reaction microchannel 5, thereby obtaining the temperature distribution of the reaction microchannel 5 along the flow direction of the reactant material.

[0040] In this embodiment, the temperature detection component 2 preferably employs a fiber Bragg grating temperature sensor array. The fiber Bragg grating temperature sensor array includes an optical fiber 8 and multiple fiber Bragg gratings spaced apart along the length of the optical fiber 8, with each fiber Bragg grating forming a temperature detection point.

[0041] Multiple fiber Bragg gratings are spaced apart along the extension path of the reaction microchannel 5, enabling different temperature detection points to sense the temperature status at different locations along the reaction microchannel 5. In one specific embodiment, adjacent temperature detection points are spaced 5–20 mm apart along the extension direction of the reaction microchannel 5, and the fiber Bragg grating temperature sensor array has 6–30 temperature detection points.

[0042] To accommodate the temperature sensing component 2, a sensing groove extending along the reaction microchannel 5 is provided on the reaction layer 1. The sensing groove is located on one side (bottom or side) of the reaction microchannel 5 and is spaced apart from the reaction microchannel 5. A fiber Bragg grating temperature sensor array is disposed within the sensing groove.

[0043] A portion of the material of the reaction layer 1 is retained between the sensing groove and the reaction microchannel 5 as a heat-conducting area, so that the temperature sensing component 2 does not directly contact the reactants in the reaction microchannel 5, while still being able to sense temperature changes at corresponding locations through the reaction layer 1. In one specific embodiment, the distance between the sensing groove and the reaction microchannel 5 is 0.3–0.5 mm.

[0044] The temperature detection component 2 can be positioned and fixed by a fixing material set in the sensing groove. The sensing groove is preferably arranged along the main extension path of the reaction microchannel 5, so that each temperature detection point corresponds to a different reaction area of ​​the reaction microchannel 5.

[0045] The optical fiber 8 of the temperature detection component 2 can be led out from the side of the reaction layer 1 and connected to a wavelength demodulator located outside the composite microchannel reactor via an optical fiber 8 connector. The wavelength demodulator collects the reflection center wavelength of each fiber Bragg grating and obtains the temperature information corresponding to each temperature detection point based on the shift in the reflection center wavelength with temperature change.

[0046] In one specific implementation, the optical fiber 8 is connected to a wavelength demodulator via an FC / APC connector. The wavelength demodulator has a scanning frequency of not less than 1 kHz to continuously acquire temperature changes at multiple temperature detection points.

[0047] In other embodiments, the temperature sensing component 2 can also be disposed on the surface of the reaction layer 1 near the reaction microchannel 5. For example, an optical fiber 8 with multiple temperature sensing points can be arranged along the extension path of the reaction microchannel 5 on the surface of the reaction layer 1, with each temperature sensing point forming a thermally conductive coupling with the corresponding position of the reaction microchannel 5 through the reaction layer 1. Thus, an embedded or surface-mounted temperature sensing structure can be selected according to the reactor manufacturing process, operating environment, and temperature sensing requirements.

[0048] In one specific structural embodiment, the reaction layer 1 is made of silicon carbide plate with a thickness of 1.5mm, and a serpentine reaction microchannel 5 is formed by laser processing. The reaction microchannel 5 has a width of 1.0mm, a depth of 0.8mm, and a total length of 1.2m. A sensing groove for mounting the temperature detection component 2 is formed on the side of the reaction microchannel 5.

[0049] The temperature detection component 2 uses a fiber Bragg grating temperature sensor array and sets 8 temperature detection points along the extension direction of the reaction microchannel 5, so that each temperature detection point corresponds to a different position along the serpentine reaction microchannel 5.

[0050] The sealing layer 3 is made of expanded polytetrafluoroethylene film with a thickness of 0.2 mm, and is processed to form a corresponding contour structure according to the corresponding area of ​​the reaction layer 1.

[0051] The heat exchange layer 4 is made of 316L stainless steel plate with a thickness of 3mm. Heat exchange channels 6 are processed on the heat exchange layer 4. The width of the heat exchange channels 6 is 1.5mm and the depth is 1.5mm, and they form a cross heat exchange relationship with the reaction microchannels 5.

[0052] During assembly, the reaction layer 1, sealing layer 3, and heat exchange layer 4 are stacked in that order, with sealing layer 3 sandwiched between reaction layer 1 and heat exchange layer 4, and each layer is pressed and fixed in place. After assembly, the flow paths of the reactant material and the heat exchange medium are checked for sealing to ensure that they are isolated from each other.

[0053] During use, the reactant enters through the inlet of the reaction microchannel 5 and flows continuously along the reaction microchannel 5; the heat exchange medium flows through the heat exchange channel 6 and exchanges heat with the reactant in the reaction microchannel 5; at the same time, the temperature detection component 2 continuously acquires temperature information at different locations along the path through multiple temperature detection points distributed along the reaction microchannel 5.

[0054] In one embodiment of a continuous diazotization reaction, an aromatic primary amine and sodium nitrite are used as reactants, and the diazotization reaction is carried out in an acidic medium. The aromatic primary amine solution and the sodium nitrite solution are separately supplied to reaction microchannel 5, where they mix and flow continuously along the microchannel, undergoing the diazotization reaction. A heat exchange medium continuously flows through heat exchange channel 6 to exchange heat with the reaction microchannel 5, maintaining the low-temperature conditions required for the diazotization reaction.

[0055] Specifically, p-chloroaniline can be used as the aromatic primary amine. A 0.5 mol / L solution of p-chloroaniline is dissolved in 15% hydrochloric acid and delivered to reaction microchannel 5 at a flow rate of 5.0 mL / min; a 0.55 mol / L sodium nitrite solution is also delivered to reaction microchannel 5 at a flow rate of 5.0 mL / min. The two streams are mixed within reaction microchannel 5 and then undergo a continuous diazotization reaction.

[0056] The heat exchange medium is a mixture of ethylene glycol and water, and the inlet temperature of the heat exchange medium can be set to -2℃. During the reaction, the temperature at different locations along the reaction microchannel 5 is continuously acquired by the temperature detection component 2, so that the temperature state within the reaction microchannel 5 can be detected separately according to its spatial location.

[0057] Under normal reaction conditions, the temperature obtained at each temperature detection point can be maintained between 2 and 4°C. When a local area in the reaction microchannel 5 experiences a temperature increase due to changes in the mixing state, proportion, or heat exchange state of the reactants, the corresponding temperature detection point can detect the corresponding temperature change, thereby obtaining the thermal state information of the local reaction area.

[0058] Especially in reactions with rapid reaction rates and concentrated exothermic activity, such as continuous diazotization, setting multiple temperature detection points along the reaction microchannel 5 can avoid judging the temperature state of the entire reaction microchannel 5 based solely on the temperature information at the reactor inlet or outlet. When local hot spots appear inside the reaction microchannel 5, the temperature detection point corresponding to that location can reflect the corresponding temperature change, thereby improving the ability to perceive the local thermal state along the reaction microchannel 5.

[0059] In this embodiment, a stacked composite structure is formed by the reaction layer 1, the sealing layer 3, and the heat exchange layer 4, so that the flow path of the reactant, the interlayer sealing, and the flow path of the heat exchange medium are respectively undertaken by the corresponding structural layers. At the same time, multiple temperature detection points are set along the extension direction of the reaction microchannel 5, so that the composite microchannel reactor can obtain the temperature status at different positions along the reaction microchannel 5 while realizing continuous reaction and heat exchange. It is especially suitable for continuous reaction processes such as continuous diazotization with highly exothermic and corrosive reaction media that require local temperature monitoring.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A composite microchannel reactor integrating distributed temperature detection, characterized in that, It includes a reaction layer, a sealing layer, and a heat exchange layer stacked together, as well as a temperature detection component; The sealing layer is disposed between the reaction layer and the heat exchange layer; The reaction layer is provided with reaction microchannels for the flow of reactants and for the reaction to occur. The sealing layer is adapted to the contour of the reaction microchannels to seal the space between the reaction layer and the heat exchange layer. The heat exchange layer is provided with heat exchange channels for the flow of heat exchange medium, and the heat exchange channels form a heat exchange relationship with the reaction microchannels; The temperature detection component includes multiple temperature detection points distributed along the extension direction of the reaction microchannel, and the multiple temperature detection points are thermally coupled to different positions of the reaction microchannel.

2. The composite microchannel reactor with integrated distributed temperature detection according to claim 1, characterized in that, The reaction layer is made of silicon carbide, the sealing layer is made of expanded polytetrafluoroethylene, and the heat exchange layer is made of stainless steel.

3. The composite microchannel reactor with integrated distributed temperature detection according to claim 1, characterized in that, The reaction microchannels extend in a serpentine or spiral shape, and the turning points of the reaction microchannels are provided with flow-guiding rounded corners.

4. The composite microchannel reactor with integrated distributed temperature detection according to claim 1, characterized in that, The temperature detection component includes a fiber Bragg grating temperature sensor array, which comprises multiple fiber Bragg gratings spaced apart along the extension direction of the reaction microchannel, with each fiber Bragg grating forming a temperature detection point.

5. The composite microchannel reactor with integrated distributed temperature detection according to claim 4, characterized in that, The reaction layer is provided with a sensing groove extending along the reaction microchannel. The sensing groove is disposed on one side of the reaction microchannel, and the fiber Bragg grating temperature sensor array is disposed in the sensing groove.

6. The composite microchannel reactor with integrated distributed temperature detection according to claim 5, characterized in that, The adjacent fiber Bragg gratings are arranged at intervals of 5 to 20 mm along the extension direction of the reaction microchannel, and the fiber Bragg grating temperature sensor array includes 6 to 30 temperature detection points.

7. The composite microchannel reactor with integrated distributed temperature detection according to claim 4, characterized in that, The fiber Bragg grating temperature sensor array is led out from the side of the reaction layer and connected to a wavelength demodulator located outside the composite microchannel reactor.

8. The composite microchannel reactor with integrated distributed temperature detection according to claim 1, characterized in that, The heat exchange channel and the reaction microchannel are arranged in a cross-flow manner so that the heat exchange medium flowing through the heat exchange channel and the reactant flowing through the reaction microchannel form a cross-flow heat exchange.

9. The composite microchannel reactor with integrated distributed temperature detection according to claim 1, characterized in that, The reaction layer and the sealing layer are connected by thermo-pressing, and the sealing layer and the heat exchange layer are connected by fasteners.

10. The composite microchannel reactor with integrated distributed temperature detection according to claim 5, characterized in that, The distance between the sensing groove and the reaction microchannel is 0.3 to 0.5 mm, and the fiber Bragg grating temperature sensor array is fixed to the reaction layer by a fixing material filled in the sensing groove.

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