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CN-224207429-U - Recovery tower condensing device for N-methylaniline production

CN224207429UCN 224207429 UCN224207429 UCN 224207429UCN-224207429-U

Abstract

The utility model discloses a recovery tower condensing device for N-methylaniline production, which comprises a tube condenser, wherein one end of the tube condenser is respectively provided with a refrigerant inlet and a refrigerant inlet, the refrigerant inlet and the refrigerant inlet are connected with a tube side, the bottom end of the tube condenser is respectively provided with an air inlet and a liquid outlet, the top end of the tube condenser is provided with a tail gas discharge port, the interior of the tube condenser, which is close to one end of the refrigerant inlet, is provided with a refrigerant filter plate, the refrigerant filter plate is provided with a refrigerant through hole, the refrigerant through hole is of a fan-shaped structure, a filter screen is arranged in the refrigerant through hole, and one side of the refrigerant filter plate, which is close to the refrigerant inlet, is provided with an automatic cleaning mechanism. According to the utility model, the rotary column drives the scraping plate to periodically scrape the refrigerant filter screen, and the negative pressure suction system is combined, so that the automatic removal and collection of impurities are realized, the filter screen is effectively prevented from being blocked, and the condensation efficiency and the continuity of equipment operation are obviously improved.

Inventors

  • LIU FENGJIE
  • CHEN SONG
  • Pei Caide

Assignees

  • 宿州恒昶生物科技有限公司

Dates

Publication Date
20260508
Application Date
20250403

Claims (6)

  1. 1. The recovery tower condensing device for N-methylaniline production comprises a tube nest condenser (1) and is characterized in that one end of the tube nest condenser (1) is provided with a refrigerant inlet (101) and a refrigerant inlet (102) respectively, the refrigerant inlet (101) and the refrigerant inlet (102) are connected with a tube side, the bottom end of the tube nest condenser (1) is provided with an air inlet (103) and a liquid outlet (105) respectively, and the top end of the tube nest condenser (1) is provided with a tail gas discharge port (104); A refrigerant filter plate (2) is arranged in the shell-and-tube condenser (1) near one end of the refrigerant inlet (101), a refrigerant through hole (201) is formed in the refrigerant filter plate (2), the refrigerant through hole (201) is of a fan-shaped structure, a filter screen is arranged in the refrigerant through hole (201), and an automatic cleaning mechanism is arranged on one side, close to the refrigerant inlet (101), of the refrigerant filter plate (2); The automatic cleaning mechanism comprises a rotating column (3), one end of the rotating column (3) extends to the inside of the shell and tube condenser (1) and is connected with a scraping plate (305), and the scraping plate (305) is in contact with the filter screen.
  2. 2. The recovery tower condensing device for N-methylaniline production according to claim 1, wherein the inside of the rotating column (3) is hollow, a supporting conduit (303) is communicated with the outer side of one end of the rotating column (3) positioned in the tubular condenser (1), and a rectangular opening is formed in one side, close to the filter screen, of the supporting conduit (303).
  3. 3. A recovery tower condensing device for N-methylaniline production according to claim 2 is characterized in that a suction collecting cover (304) is arranged on the outer side of the rectangular opening, a scraping plate (305) is elastically installed inside the suction collecting cover (304), one end of a rotating column (3) far away from a filter screen extends to the outside of a shell-and-tube condenser (1) and is connected with a suction connecting pipe (302) through a rotating joint (301), and the suction connecting pipe (302) is connected with a negative pressure device.
  4. 4. A recovery tower condensing unit for N-methylaniline production according to claim 3, characterized in that the inner side wall of said suction collection hood (304) is provided with a sliding rail (307), the scraper (305) is slidably mounted on the sliding rail (307), and a spring (308) is mounted in the sliding rail (307).
  5. 5. The recovery tower condensing device for N-methylaniline production according to claim 4, wherein a spiral guide rail (306) is arranged outside the rotary column (3), and a sliding groove is formed in one side, far away from the rotary column (3), of the spiral guide rail (306).
  6. 6. The recovery tower condensing device for N-methylaniline production according to claim 5, wherein a push rod motor (4) is fixed on the outer wall of the shell and tube condenser (1) through a bracket, a limit rod (401) is fixed on an output shaft of the push rod motor (4), and one end of the limit rod (401) extends into the chute.

Description

Recovery tower condensing device for N-methylaniline production Technical Field The utility model relates to the technical field of N-methylaniline production, in particular to a recovery tower condensing device for N-methylaniline production. Background And in the final separation step of producing the N-methylaniline, the crude product N-methylaniline is pumped into a methanol tower by an N-methylaniline beating pump after being uniformly mixed, methanol is distilled and recovered at the temperature of 60-75 ℃ at the normal pressure in the methanol tower, other component mediums enter an aniline azeotropic tower for treatment, and aniline and water are distilled off from the upper part of the tower in an azeotropic way at the temperature of-0.09 MPa and 150-170 ℃. The gaseous medium was separated by condensation in a condenser under 5% brine, wherein the organic phase entered the aniline column. And (3) after the inorganic phase enters a wastewater tower to recycle aniline, the rest wastewater is subjected to environmental protection treatment. The top of the aniline tower is azeotroped at the temperature of 102 ℃, and the gas phase medium is condensed by an aniline recovery tower condenser. The condensation recovery of the gaseous medium at the top of the aniline tower is a key link in the process flow. In the prior art, the tube condenser realizes condensation through heat exchange between a refrigerant and a gas-phase medium, but the following problems are found in practical application: The filter screen is easy to block and frequent to maintain, the refrigerant often contains particles or pipeline rust impurities, the traditional filter screen lacks self-cleaning function, impurities are easy to accumulate to reduce the flow cross section area, the refrigerant flow is reduced, and the heat exchange efficiency is obviously reduced. Frequent shutdown and manual cleaning are needed, production continuity is affected, and maintenance cost is increased. The risk of secondary pollution of impurities is high, scraped impurities are easy to flow back along with the refrigerant or scatter to the inner wall of the tube array in the cleaning process of the traditional filtering device, so that the refrigerant is polluted and the tube array is locally blocked, heat transfer deterioration is caused by long-term accumulation, and even the problem of equipment corrosion is caused. The existing condensing device lacks an integrated impurity removal system, a filter screen is clean, impurity collection needs to rely on manual operation, the efficiency is low, and potential safety hazards of operators contacting harmful chemical substances exist. The defects cause that the existing condensing device is difficult to meet the continuous and efficient production requirements of the N-methylaniline, and especially under the high-load working condition, the stability and the environmental protection of the device face serious challenges. Therefore, a condensing device capable of realizing self-cleaning of the filter screen, synchronous impurity removal and no need of frequent maintenance is needed, so as to ensure the production efficiency and the process safety. Disclosure of utility model In order to solve the problems mentioned in the background art, the utility model provides a recovery tower condensing device for N-methylaniline production. In order to achieve the above purpose, the present utility model adopts the following technical scheme: the recovery tower condensing device for N-methylaniline production comprises a tube condenser, wherein one end of the tube condenser is respectively provided with a refrigerant inlet and a refrigerant inlet, the refrigerant inlet and the refrigerant inlet are connected with a tube side, the bottom end of the tube condenser is respectively provided with an air inlet and a liquid outlet, and the top end of the tube condenser is provided with a tail gas discharge port; The inside of the shell-and-tube condenser, which is close to one end of the refrigerant inlet, is provided with a refrigerant filter plate, the refrigerant filter plate is provided with a refrigerant through hole, the refrigerant through hole is of a fan-shaped structure, a filter screen is arranged in the refrigerant through hole, and one side of the refrigerant filter plate, which is close to the refrigerant inlet, is provided with an automatic cleaning mechanism; The automatic cleaning mechanism comprises a rotating column, one end of the rotating column extends to the inside of the tube condenser and is connected with a scraping plate, and the scraping plate is in contact with the filter screen. Preferably, the inside of the rotating column is hollow, a supporting conduit is communicated with the outer side of one end of the rotating column, which is positioned in the tubular condenser, and a rectangular opening is formed in one side, close to the filter screen, of the supporting conduit. Preferably, be located