Condenser online cleaning system for bromine production

Abstract

The utility model relates to a condenser online cleaning system for bromine production, and belongs to the technical field of inorganic chemical equipment. The cleaning system comprises a distillation tower, a waste acid condenser, a bromine condenser, a waste acid tank, a descaling configuration tank and a pickling pump, the waste acid condenser and the bromine condenser are tubular heat exchangers, a pipeline at the top of the distillation tower is connected with one side of a tube pass of the bromine condenser, and the other side of the tube pass of the bromine condenser is connected with a liquid bromine discharge pipeline. A pipeline at the bottom of the distillation tower is connected with one side of a tube pass of a waste acid condenser, the other side of the tube pass of the waste acid condenser is respectively connected with a waste acid tank and a descaling configuration tank, and the bottom of the descaling configuration tank is connected with one side of a shell pass of the waste acid condenser and one side of a shell pass of a bromine condenser through a pickling pump. According to the online cleaning device, online cleaning of the bromine condenser and the waste acid condenser is achieved, equipment maintenance is completed on the premise that normal production is guaranteed, parking is reduced, and the labor intensity of front-line production personnel is lowered.

Description

Technical Field

[0001] The utility model relates to an on-line cleaning system for condensers used in bromine production, belonging to the technical field of inorganic chemical equipment. Background Art

[0002] Since the seawater bromine extraction process was developed in 1907, the process has become increasingly mature. With continuous technological development, the seawater bromine extraction technology has made great progress. The research and development carried out on devices and processes support the continuous progress of the seawater bromine extraction process.

[0003] At present, most domestic production enterprises adopt the acid-type air blowing method. The main process is to adjust the pH of seawater or underground brine with a low bromine content to about 3 using hydrochloric acid or sulfuric acid, introduce chlorine gas to oxidize bromide ions into bromine molecules, blow out molecular bromine with air, then use sulfur dioxide and water to absorb bromine molecules and convert them into hydrobromic acid, increase the bromine content to 30 - 100 g / L, and then obtain bromine products through distillation and separation.

[0004] In the distillation process, bromine gas enters the bromine condenser from the top of the distillation tower, condenses into a liquid after heat exchange with the refrigerant. In actual production, brine is mostly selected as the heat exchange medium, and a shell-and-tube heat exchanger is selected for the bromine condenser. Bromine gas flows through the tube side, and brine flows through the shell side. After long-term operation, impurities carried in the brine will adhere to the tube wall, weakening the heat exchange effect and affecting normal production. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the utility model provides an on-line cleaning system for condensers used in bromine production, which realizes the on-line cleaning of bromine condensers and waste acid condensers, completes equipment maintenance on the premise of ensuring normal production, reduces the occurrence of shutdowns, and reduces the labor intensity of front-line production personnel.

[0006] The technical solution of the utility model is as follows:

[0007] An on-line cleaning system for condensers used in bromine production includes a distillation tower, a waste acid condenser, a bromine condenser, a waste acid tank, a descaling configuration tank, and a pickling pump. Among them, both the waste acid condenser and the bromine condenser are shell-and-tube heat exchangers. One side of the tube side of the bromine condenser is connected to the pipeline at the top of the distillation tower, and the other side of the tube side of the bromine condenser is connected to a liquid bromine discharge pipeline. One side of the tube side of the waste acid condenser is connected to the pipeline at the bottom of the distillation tower, and the other side of the tube side of the waste acid condenser is respectively connected to a waste acid tank and a descaling configuration tank. The bottom of the descaling configuration tank is connected to one side of the shell side of the waste acid condenser and the bromine condenser through a pickling pump.

[0008] Preferably according to the present utility model, valves A and B are respectively arranged on the pipeline connecting the shell sides of the pickling pump, the bromine condenser and the waste acid condenser. One side of the shell side of the bromine condenser is connected with a brine inlet pipe A, and the other side of the shell side of the bromine condenser is connected with a brine drain pipe A. A glass sight glass A and a pH detector A are arranged on the brine drain pipe A, and the pH detector A is connected with valve A;

[0009] One side of the shell side of the waste acid condenser is connected with a brine inlet pipe B, and the other side of the shell side of the waste acid condenser is connected with a brine drain pipe B. A glass sight glass B and a pH detector B are arranged on the brine drain pipe B, and the pH detector B is connected with valve B.

[0010] Preferably according to the present utility model, the outlet side of the pickling pump is also connected to the top of the descaling configuration tank through a pipeline, and valves C and a pH detector C are arranged on the pipeline connecting the pickling pump and the top of the descaling configuration tank.

[0011] Preferably according to the present utility model, a temperature sensor A is arranged on the liquid bromine discharge pipeline, and a temperature sensor B is arranged on the pipeline connecting the other side of the tube side of the waste acid condenser.

[0012] Preferably according to the present utility model, the top of the descaling configuration tank is connected with a fresh water pipeline.

[0013] During use, brine is used to exchange heat with bromine gas and waste acid respectively in the distillation process. The boiling point of bromine is 58.76 °C. Bromine gas enters the bromine condenser from the top of the distillation tower, condenses into a liquid and then enters the subsequent equipment through the liquid bromine discharge pipeline. The waste acid (pH < 1, temperature about 85 - 90 °C) produced at the bottom of the distillation tower enters the waste acid condenser, is condensed and cooled and then enters the waste acid tank. After long-term operation, scale will appear on the shell sides of the bromine condenser and the waste acid condenser, resulting in a reduction in the heat exchange effect and affecting normal production;

[0014] The temperature of the pipeline is monitored in real time through the temperature sensor A. When it is found that the temperature is approaching the boiling point of bromine, it indicates that the effect of the bromine condenser has deteriorated and needs to be cleaned. Fresh water is injected into the descaling configuration tank. At the same time, the waste acid after condensation in the waste acid condenser enters the descaling configuration tank. Valve C is opened, the pickling pump drives the liquid in the descaling configuration tank to be mixed evenly, and the pH value is detected by the pH detector C. After reaching the set pH value requirement, valve C is closed and valve A is opened. Acid solution is introduced into the shell side of the bromine condenser for pickling operation. The online cleaning effect is observed through the glass sight glass A. At the same time, the pH detector A monitors the pH value of the pickling waste liquid online. After the pH value reaches the set value, the pickling operation is completed and valve A is closed to complete the online cleaning. The cleaning process of the waste acid condenser is the same as that of the bromine condenser.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. The utility model provides an on-line cleaning system for condensers used in bromine production, which realizes the on-line cleaning of bromine condensers and waste acid condensers, completes equipment maintenance on the premise of ensuring normal production, reduces the occurrence of shutdowns, and reduces the labor intensity of front-line production personnel.

[0017] 2. The utility model uses the waste acid generated by distillation to reversely realize the on-line cleaning of bromine condensers and waste acid condensers, makes full use of the waste acid in bromine production, has low cleaning cost, and realizes the reuse of waste acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the utility model;

[0019] Wherein: 1. Distillation tower; 2. Waste acid condenser; 3. Bromine condenser; 4. Waste acid tank; 5. Scale removal configuration tank; 6. Pickling pump; 7. Liquid bromine discharge pipeline; 8. Brine inlet pipe A; 9. Glass sight glass A; 10. pH detector A; 11. Valve A; 12. Brine inlet pipe B; 13. Glass sight glass B; 14. pH detector B; 15. Valve B; 16. Valve C; 17. pH detector C; 18. Temperature sensor A; 19. Temperature sensor B; 20. Fresh water pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following is further described by way of examples in conjunction with the drawings, but is not limited thereto.

[0021] Example 1:

[0022] This embodiment provides an on-line cleaning system for condensers used in bromine production, including a distillation tower 1, a waste acid condenser 2, a bromine condenser 3, a waste acid tank 4, a scale removal configuration tank 5 and a pickling pump 6. Among them, both the waste acid condenser 2 and the bromine condenser 3 are shell-and-tube heat exchangers. The pipeline at the top of the distillation tower 1 is connected to one side of the tube side of the bromine condenser 3, and the other side of the tube side of the bromine condenser 3 is connected to a liquid bromine discharge pipeline 7. The pipeline at the bottom of the distillation tower 1 is connected to one side of the tube side of the waste acid condenser 2, and the other side of the tube side of the waste acid condenser 2 is respectively connected to a waste acid tank 4 and a scale removal configuration tank 5. The bottom of the scale removal configuration tank 5 is connected to one side of the shell side of the waste acid condenser 2 and the bromine condenser 3 through a pickling pump 6. The scale removal configuration tank is an existing device with a stirring motor and a stirring shaft, which can improve the mixing efficiency.

[0023] Valves A 11 and valves B 15 are respectively arranged on the connecting pipelines of the pickling pump 6 with the shell sides of the bromine condenser 3 and the waste acid condenser 2. One side of the shell side of the bromine condenser is connected to a brine inlet pipe A 8, and the other side of the shell side of the bromine condenser is connected to a brine drain pipe A. A glass sight glass A 9 and a pH detector A 10 are arranged on the brine drain pipe A, and the pH detector A 10 is connected to a valve A 11;

[0024] One side of the shell side of the waste acid condenser 2 is connected with a brine inlet pipe B12, and the other side of the shell side of the waste acid condenser 2 is connected with a brine drain pipe B. A glass sight glass B13 and a pH detector B14 are arranged on the brine drain pipe B, and the pH detector B is connected with a valve B15.

[0025] The outlet side of the pickling pump 6 is also connected to the top of the descaling configuration tank 5 through a pipeline. A valve C16 and a pH detector C17 are arranged on the connecting pipeline between the pickling pump 6 and the top of the descaling configuration tank 5.

[0026] A temperature sensor A18 is arranged on the liquid bromine discharge pipeline 7, and a temperature sensor B19 is arranged on the connecting pipeline on the other side of the tube side of the waste acid condenser.

[0027] The top of the descaling configuration tank 5 is connected with a fresh water pipeline 20.

[0028] During use, in the distillation process, brine is used to exchange heat with bromine gas and waste acid respectively. The boiling point of bromine is 58.76°C. Bromine gas enters the bromine condenser from the top of the distillation tower, condenses into a liquid and then enters the subsequent equipment through the liquid bromine discharge pipeline. The waste acid produced at the bottom of the distillation tower (pH < 1, temperature about 85 - 90°C) enters the waste acid condenser, is condensed and cooled and then enters the waste acid tank. After long-term operation, scale will appear on the shell side of the bromine condenser and the waste acid condenser, resulting in a reduction in the heat exchange effect and affecting normal production.

[0029] The pipeline temperature is monitored in real time through the temperature sensor A. When it is found that the temperature is approaching the boiling point of bromine, it means that the effect of the bromine condenser becomes poor and needs to be cleaned. Fresh water is injected into the descaling configuration tank. At the same time, the waste acid after condensation by the waste acid condenser enters the descaling configuration tank. The valve C is opened, and the pickling pump drives the liquid in the descaling configuration tank to be mixed evenly, and the pH value is detected by the pH detector C. After reaching the set pH value requirement, the valve C is closed, and the valve A is opened. Acid solution is introduced into the shell side of the bromine condenser for pickling operation. The online cleaning effect is observed through the glass sight glass A. At the same time, the pH detector A monitors the pH value of the pickling waste liquid online. After the pH value reaches the set value, the pickling operation is completed, and the valve A is closed to complete the online cleaning. The cleaning process of the waste acid condenser is the same as that of the bromine condenser. During actual operation, high-concentration hydrochloric acid (31% concentration) or industrial-grade citric acid, etc. can be additionally added to the descaling configuration tank according to economic requirements or efficiency requirements, etc.

[0030] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An online cleaning system for a condenser for bromine production, characterized in that: It includes a distillation tower, a waste acid condenser, a bromine condenser, a waste acid tank, a descaling tank and a pickling pump, wherein the waste acid condenser and the bromine condenser are both shell-and-tube heat exchangers, the top pipeline of the distillation tower is connected to one side of the tube side of the bromine condenser, and the other side of the tube side of the bromine condenser is connected to a liquid bromine discharge pipeline, the bottom pipeline of the distillation tower is connected to one side of the tube side of the waste acid condenser, and the other side of the tube side of the waste acid condenser is respectively connected to the waste acid tank and the descaling tank, and the bottom of the descaling tank is connected to the shell side of the waste acid condenser and the bromine condenser through a pickling pump.

2. The online cleaning system for condensers for bromine production according to claim 1, characterized in that: Valve A and valve B are respectively provided on the shell-side connecting pipelines of the pickling pump, the bromine condenser and the waste acid condenser. One side of the shell side of the bromine condenser is connected to a brine inlet pipe A, and the other side of the shell side of the bromine condenser is connected to a brine drainage pipe A. A glass sight glass A and a pH detector A are provided on the brine drainage pipe A, and the pH detector A is connected to valve A. One side of the shell side of the waste acid condenser is connected to a brine inlet pipe B, and the other side of the shell side of the waste acid condenser is connected to a brine drain pipe B. A glass sight glass B and a pH detector B are provided on the brine drain pipe B, and the pH detector B is connected to a valve B.

3. The online cleaning system for condensers for bromine production according to claim 2, characterized in that: The outlet side of the pickling pump is also connected to the top of the descaling configuration tank through a pipeline, and a valve C and a pH detector C are arranged on the connecting pipeline between the pickling pump and the top of the descaling configuration tank.

4. The online cleaning system for condensers for bromine production according to claim 3, characterized in that: A temperature sensor A is provided on the liquid bromine discharge pipeline, and a temperature sensor B is provided on the connecting pipeline on the other side of the tube pass of the waste acid condenser.

5. The online cleaning system for condensers for bromine production according to claim 1, characterized in that: A fresh water pipe is connected to the top of the descaling configuration tank.

Images