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CN-224207978-U - Spring structure and contain this spring structure's tubulation

CN224207978UCN 224207978 UCN224207978 UCN 224207978UCN-224207978-U

Abstract

The application relates to a spring structure and a tube array comprising the same, and relates to the field of filling tube array type fixed bed reactors, comprising an integrated elastic piece positioned inside the tube array type fixed bed reactor, the integrated elastic piece comprises a first spring and a second spring which are relatively and fixedly connected, the second spring is positioned at the bottom end of the first spring, the second spring extends out of the bottom end of the tubular fixed bed reactor, and inert medium is filled in the first spring. The application has the advantages of facilitating the taking out of the spring positioned in the tube array, reducing the cleaning or replacing operation of the spring in the later period and reducing the subsequent operation difficulty.

Inventors

  • YU XIAOYU
  • YANG ZHAORUI
  • Wei Bodi
  • YU LICHENG

Assignees

  • 兰州燕港化学有限公司

Dates

Publication Date
20260508
Application Date
20250423

Claims (10)

  1. 1. The spring structure is characterized by comprising an integrated elastic piece (1) positioned in a tubular fixed bed reactor (2), wherein the integrated elastic piece (1) comprises a first spring (11) and a second spring (12) which are relatively and fixedly connected, the second spring (12) is positioned at the bottom end of the first spring (11), the second spring (12) extends out from the bottom end of the tubular fixed bed reactor (2), and inert medium is filled in the first spring (11).
  2. 2. The spring structure according to claim 1, wherein a third spring is arranged above the first spring (11), and the third spring is positioned at the junction of the reaction section and the quenching section of the tubular fixed bed reactor (2).
  3. 3. The spring structure according to claim 1, wherein a diameter-reducing section (13) is arranged between the first spring (11) and the second spring (12), the diameter of the diameter-reducing section (13) gradually increases from the center position to the two end positions, one end of the diameter-reducing section (13) is fixedly connected with the first spring (11), and the other end of the diameter-reducing section (13) is fixedly connected with the second spring (12).
  4. 4. A spring structure according to claim 3, wherein: the minimum inner diameter of the diameter-reducing section (13) is larger than 0, and the inner part of the first spring (11) is communicated with the inner part of the second spring (12) through the diameter-reducing section (13).
  5. 5. A spring structure according to claim 3, characterized in that the pitch of the reduced diameter segments (13) is smaller than the pitch of the first springs (11).
  6. 6. The spring structure according to claim 1, wherein the maximum outer diameter of the first spring (11) is not larger than the inner diameter of the tubular fixed bed reactor (2).
  7. 7. The spring structure according to claim 6, wherein the outer diameter of the first spring (11) is 0.8-1 times the inner diameter of the tubular fixed bed reactor (2).
  8. 8. The spring structure according to claim 1, wherein the outer diameter of the second spring (12) is larger than the inner diameter of the tubular fixed bed reactor (2).
  9. 9. The spring structure according to claim 1, wherein the first spring (11) and the second spring (12) have the same shape as the shell-and-tube fixed bed reactor (2), and the size of the first spring (11) is smaller than the size of the shell-and-tube fixed bed reactor (2).
  10. 10. A tube array (21), characterized in that the tube array (21) comprises a spring structure according to any one of claims 1-9 arranged in a tube array type fixed bed reactor (2).

Description

Spring structure and contain this spring structure's tubulation Technical Field The application relates to the field of filling tube type fixed bed reactors, in particular to a spring structure and a tube containing the same. Background In the process for preparing acrolein by propylene oxidation, the Bi 2O3-MoO3 catalyst has the highest activity and the best selectivity, and comprises molybdate ions [ MoO 6 ] with octahedral structures and Mo=O bonds. However, when MoO 3 is contacted with propylene at 300-500 ℃, the MoO 3 is easy to combine with water vapor under the action of high-temperature vapor, and sublimates in the form of MoO 3-nH2 O to cause the reduction of the activity of the catalyst, namely, from the perspective of the catalyst component, the component loss phenomenon caused by the sublimation of the active component exists. The reactor for preparing the acrolein by propylene oxidation is a tube type fixed bed three-tube-plate reactor conventionally, catalysts with different activities are filled along the inlet to the outlet of a reaction tube, the bottom is only provided with a section of supporting spring, the three tube plates are an upper tube plate, a middle tube plate and a lower tube plate respectively, wherein the middle tube plate is positioned at the middle lower part of the reactor, the reactor is divided into two independent spaces, the upper part is a reaction section, the lower part is a cooling section, and the reactor is used for timely leading out heat generated by the reaction section and avoiding deep oxidation of products to generate byproducts. The temperature difference between the reaction section and the cooling section is 80-110 ℃, and the deposition of high boiling point organic components in the reaction product at the junction of the reaction section and the cooling section is easy to occur due to the relatively large temperature difference. The high boiling point organic component has high viscosity and slow flow, can generate a similar seed effect, and prevents the material flow and the lost active component from flowing normally in the tube array, so that the resistance of the bed layer is reduced (pressure drop) and the energy consumption of the whole operation of the device is continuously increased, the reaction performance of the catalyst is gradually deteriorated, the service life is greatly shortened, and the long-period stable operation of the catalyst is seriously influenced. In view of the above-mentioned related art, the inventors believe that it is difficult to eliminate metal impurities accumulated on one side of the catalyst by using a conventional scorching method, such as by using a physical method to perform local scorching, and the conventional catalyst is generally provided with springs inside the tubes when the tubes are filled, but when coking occurs inside the tubes, the springs inside the tubes are difficult to take out and clean or replace, resulting in great difficulty in subsequent operations. Disclosure of utility model In order to facilitate taking out the springs positioned in the tube array, reduce the later operation of cleaning or replacing the springs and reduce the subsequent operation difficulty, the application provides a spring structure and the tube array comprising the same. The spring structure provided by the application adopts the following technical scheme: The utility model provides a spring structure, is including being located the inside integration elastic component of shell and tube fixed bed reactor, integration elastic component is including relative fixed connection's first spring and second spring, and the second spring is located the bottom of first spring, the second spring is followed the bottom of shell and tube fixed bed reactor stretches out, the inside of first spring is filled with inert medium. Optionally, a third spring is arranged above the first spring, and the third spring is located at the junction of the reaction section and the quenching section of the tubular fixed bed reactor. Optionally, a diameter reducing section is arranged between the first spring and the second spring, the diameter of the diameter reducing section gradually increases from the central position to the positions of the two ends, one end of the diameter reducing section is fixedly connected with the first spring, and the other end of the diameter reducing section is fixedly connected with the second spring. Optionally, the minimum inner diameter of the diameter reduction section is greater than 0, and the interior of the first spring is communicated with the interior of the second spring through the diameter reduction section. Optionally, the pitch of the reduced diameter section is smaller than the pitch of the first spring. Optionally, the maximum outer diameter of the first spring is not greater than the inner diameter of the tubular fixed bed reactor. Optionally, the outer diameter of the first spring is 0.8-1 times of th