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CN-122006622-A - Heat exchange type biconical gap impinging stream microreactor for exothermic reaction

CN122006622ACN 122006622 ACN122006622 ACN 122006622ACN-122006622-A

Abstract

The invention belongs to the technical field of chemical reaction equipment, and discloses a heat exchange type biconical gap impinging stream microreactor for exothermic reaction, which comprises an outer conical connecting pipe, wherein the top opening of the outer conical connecting pipe is connected with a vertical liquid inlet pipe, and the left opening of the outer conical connecting pipe is connected with a mixed liquid outlet pipe; the inner cone-shaped connecting pipe is coaxially arranged in the outer cone-shaped connecting pipe and is provided with a gap LI, the opening at the right side of the inner cone-shaped connecting pipe is connected with the front end of the horizontal liquid inlet pipe, the front ends of the outer cone-shaped connecting pipe and the inner cone-shaped connecting pipe are both provided with cone parts, and the front end cone parts of the inner cone-shaped connecting pipe are provided with a plurality of micropores which are distributed at intervals. The invention provides the microreactor integrating high-efficiency mixing, enhanced heat transfer and high-flux design through the combination of the biconical gap impinging stream structure and the internal and external heat exchange channels, which can realize the maintenance of the environmental stability of exothermic reaction under extreme working conditions and improve the reaction safety and the product quality stability.

Inventors

  • YAN DONGMAO
  • QIN GAOWU
  • DONG XIN
  • YAN PENGRAN

Assignees

  • 沈阳化工大学

Dates

Publication Date
20260512
Application Date
20260413

Claims (10)

  1. 1. The heat exchange type biconical gap impinging stream microreactor for exothermic reaction is characterized by comprising an outer conical connecting pipe, wherein the top opening of the outer conical connecting pipe is connected with a vertical liquid inlet pipe, and the left opening of the outer conical connecting pipe is connected with a mixed liquid outlet pipe; the inner cone-shaped connecting pipe is coaxially arranged in the outer cone-shaped connecting pipe and is provided with a gap LI, the opening at the right side of the inner cone-shaped connecting pipe is connected with the front end of the horizontal liquid inlet pipe, the front ends of the outer cone-shaped connecting pipe and the inner cone-shaped connecting pipe are respectively provided with a cone part, and the front end cone part of the inner cone-shaped connecting pipe is provided with a plurality of micropores which are distributed at intervals; The vertical section of the condensate liquid inlet pipe of the inner heat exchange channel is inserted into the opening at the top of the horizontal liquid inlet pipe and fixed, the horizontal section is arranged in the horizontal liquid inlet pipe and is sequentially connected with the first inner heat exchange connecting pipe, the second inner heat exchange connecting pipe and the horizontal section of the condensate liquid outlet pipe of the inner heat exchange channel arranged in the mixed liquid outlet pipe, and the vertical section of the condensate liquid outlet pipe of the inner heat exchange channel extends out from the opening at the top of the mixed liquid outlet pipe and is connected with the vertical section; the first inner heat exchange connecting pipe and the second inner heat exchange connecting pipe are arranged in the inner conical connecting pipe and are provided with a gap LII, the outer part of the second inner heat exchange connecting pipe is fixed with the front end surface of the inner conical connecting pipe, and gaps allowing fluid to circulate are reserved between the second inner heat exchange connecting pipe and the outer conical connecting pipe as well as between the second inner heat exchange connecting pipe and the mixed liquid outlet pipe; The external heat exchange tube is sleeved outside the joint of the external conical connecting tube and the mixed liquid outlet tube, a gap LIII is formed between the external heat exchange tube and the mixed liquid outlet tube, the bottom opening of the external heat exchange tube is connected with the condensate liquid inlet tube of the external heat exchange channel, and the top opening of the external heat exchange tube is connected with the condensate liquid outlet tube of the external heat exchange channel.
  2. 2. The heat exchange type double conical gap impinging stream microreactor for exothermic reaction according to claim 1, wherein the inner diameter of the horizontal liquid inlet tube is 18mm-25mm, the volume flow is 100L/H-378L/H, and the flow rate is 0.109m/s-0.214m/s.
  3. 3. The heat exchange type double conical gap impinging stream microreactor for exothermic reaction according to claim 1, wherein the inner diameter of the vertical liquid inlet tube is 18mm-25mm, the volume flow is 142.86L/H-550L/H, and the flow rate is 0.156m/s-0.311m/s.
  4. 4. The heat exchange type biconical gap impinging stream microreactor for exothermic reaction according to claim 1, wherein the inner diameter of the mixed liquor outlet tube is 20mm-25mm, and the volume flow is 242.86L/H-928L/H.
  5. 5. The heat exchange type biconical gap impinging stream microreactor for exothermic reaction according to claim 1, wherein the micropores are circular through holes, and the tapered parts at the front ends of the inner tapered connecting pipes are uniformly distributed in two circles, namely 90 circles each.
  6. 6. A heat exchange type double cone gap impinging stream microreactor for exothermic reactions according to claim 1, wherein the micro-pore inner diameter is 0.2 mm-0.6mm, the gap LI width between the inner cone connection tube and the outer cone connection tube is 1.5mm-2.5mm, and the flow ratio of the first fluid and the second fluid is 7:10.
  7. 7. The heat exchange type biconical gap impinging stream microreactor for exothermic reaction according to claim 1, wherein the inner diameters of the inner heat exchange channel condensate liquid inlet pipe and the inner heat exchange channel condensate liquid outlet pipe are 8mm.
  8. 8. The heat exchange type biconical gap impinging stream microreactor for exothermic reaction according to claim 1, wherein the inner diameters of the condensate outlet pipe of the external heat exchange channel and the condensate outlet pipe of the external heat exchange channel are 8mm.
  9. 9. A heat exchange type double cone gap impinging stream microreactor for exothermic reactions according to claim 1, characterized in that the gap LII between the first and second inner heat exchange connection tubes and the inner cone connection tube is 3-5 mm in width.
  10. 10. A heat exchange type double cone gap impinging stream microreactor for exothermic reactions according to claim 1, wherein the gap LIII width between the junction of the external heat exchange tube and the external cone connection tube, the mixed liquor outlet tube is 3mm-5mm.

Description

Heat exchange type biconical gap impinging stream microreactor for exothermic reaction Technical Field The invention relates to the technical field of chemical reaction equipment, in particular to a heat exchange type biconical gap impinging stream microreactor for exothermic reaction, which is used for strengthening heat and mass transfer equipment for high-pressure and high-exothermic reaction. Background The microreactor is used as core equipment for enhancing heat and mass transfer in the exothermic reaction process, and plays a key role in the fields of chemical industry, pharmacy, energy and the like. The problems of low mixing efficiency, long time consumption, poor temperature control precision and the like of the traditional microreactor generally exist, and particularly, the problems of uneven fluid distribution and easy initiation of safety risks due to heat accumulation in the fine chemical synthesis and nano material preparation with the characteristics of high pressure, high heat release and the like are related, and meanwhile, the low-flux design is difficult to meet the requirements of industrial mass production. In the prior art, the similar microreactors mostly adopt simplified flow channel designs, such as single straight channel or T-shaped mixing units, rely on molecular diffusion in laminar flow state as a main mixing mechanism, lack active turbulence promoting means, cause uneven fluid distribution and slow interface diffusion, have the mixing uniformity of usually lower than 0.5, and are easy to cause side reaction or product quality fluctuation when treating high-viscosity or easily-reacted materials. Meanwhile, the heat exchange design of the traditional equipment is generally externally arranged in a mixing area and is realized in a jacket or coil pipe mode, the thermal resistance is large, the response is slow, the reaction temperature cannot be accurately regulated and controlled, the local temperature fluctuation exceeding +/-10 ℃ can be caused by heat accumulation in a high-heat-release scene, and the thermal runaway risk is increased. In addition, the non-concentric axis layout and the low density micropore distribution further lead to poor pressure equalization and increased flow dead zone, and the upper flux limit is limited below 400L/H, so that the method is not suitable for high flux application. These structural drawbacks not only extend the mixing time, affect the reaction efficiency, but also limit the adaptability of the microreactor in extreme environments, highlighting the urgent need for innovative solutions. Therefore, a micro-reactor capable of solving the problems of low mixing efficiency, insufficient heat exchange capability and limited flux is needed to break through the technical bottleneck of the traditional equipment in the high-pressure high-heat release reaction scene. Disclosure of Invention In order to solve the technical problems in the prior art, the invention aims to provide a heat exchange type biconical gap impinging stream microreactor. The invention provides a microreactor integrating efficient mixing, enhanced heat transfer and high-flux design through the combination of a biconical gap impinging stream structure and an inner heat exchange channel and an outer heat exchange channel. In order to achieve the above purpose, the present invention adopts the following technical scheme: A heat exchange type double-cone gap impinging stream microreactor for exothermic reaction comprises an outer cone-shaped connecting pipe, wherein the top opening of the outer cone-shaped connecting pipe is connected with a vertical liquid inlet pipe, and the left opening is connected with a mixed liquid outlet pipe; the inner cone-shaped connecting pipe is coaxially arranged in the outer cone-shaped connecting pipe and is provided with a gap LI, the opening at the right side of the inner cone-shaped connecting pipe is connected with the front end of the horizontal liquid inlet pipe, the front ends of the outer cone-shaped connecting pipe and the inner cone-shaped connecting pipe are respectively provided with a cone part, and the front end cone part of the inner cone-shaped connecting pipe is provided with a plurality of micropores which are distributed at intervals; The vertical section of the condensate liquid inlet pipe of the inner heat exchange channel is inserted into the opening at the top of the horizontal liquid inlet pipe and is connected with the opening at the top of the horizontal liquid inlet pipe, the horizontal section is arranged in the horizontal liquid inlet pipe and is sequentially connected with the first inner heat exchange connecting pipe, the second inner heat exchange connecting pipe and the horizontal section of the condensate liquid outlet pipe of the inner heat exchange channel arranged in the mixed liquid outlet pipe, and the vertical section of the condensate liquid outlet pipe of the inner heat exchange channel extends out from the ope