Column device is a contact device for rectification tower type soda water. This device is also called distillation column. Regarding the type of column device, let's learn about the cleaning operation rules of the lower column device!
Operation Procedures for Column Washing In order to clean the rectification column, avoid cross-contamination, and ensure product quality, Columns must be operated in accordance with the following procedures.
Solvent reflux: According to the actual situation, after the rectification operation is completed, an appropriate amount of solvent is inhaled into the distillation kettle, and after the temperature is raised, it is refluxed at atmospheric pressure, and all the materials adsorbed in the tower can be taken out as much as possible! The selection of solvent is used in principle Recovered solvent for this process!
Clear water overflow: Add an appropriate amount of clear water directly into the kettle from the feed valve of the distillation kettle, or suck the clear water into the kettle through the top vacuum, and pre-clean it with clear water; decide whether to discharge the washing water according to the actual situation!
Washing with alkaline water: vacuum suction about 1% of the alkaline solution in the kettle, then raise the temperature to 100~110°C, collect fractions after full reflux for 60 minutes, and wash the pipeline and equipment with alkaline water.
Towers: Tall buildings resonate under the influence of wind. Once the vibration damage is serious, the tower flange will leak, the anchor bolts will be loose, and the heavy tower will be damaged by fatigue, causing accidents. So avoid resonance.
One of the anti-vibration measures is the use of spoilers such as windscreens.
Axial-fin or helical-fin spoilers are installed in the upper 1/3 of the tower height.
The length l of the axial fin is 0.75 -0.9 times the diameter D of the column, and the width b of the fin is 0.069 times D. The number of fins on the same circumference is 4, and the angle between them is 90°. The fins on adjacent circumferences are staggered by 30 degrees, and for column equipment with axial fins, the resonance amplitude will be reduced by about 1/2.
When the fins are helical, they have a head count of 3, staggered by 120. The pitch t is 5 times the diameter d, and the width w of the fins is 0.1 times the diameter d, where the diameter refers to the outer diameter of the column, including insulation. Spiral paper is more efficient than axial fins.
Let's take a look at the anti-vibration structure and windproof ring on the chimney.
Hot water overflow: Add an appropriate amount of clean water to the distillation kettle, heat up and reflux for 30 minutes, and collect all the alkaline water in the equipment and pipelines for the purpose of cleaning.
Vacuum drying: The rectification tower is dried by vacuum drying. The staff can confirm that there is no water in the distillation kettle through the mirror observation, and the gas phase temperature in the kettle reaches 80~90. After maintaining for 60min, the drying work is considered to be over!< /p>
Methanol washing: The qualified recovery-grade methanol solvent in the vacuum suction kettle is heated up for full reflux, and an appropriate amount is collected into each collection tank; pay attention to sampling and analysis before and after methanol reflux (including each collection tank).
Comparing the changes of the impurity content in the methanol solvent before and after cleaning the tower, it is believed that vacuum drying is also used after methanol cleaning.
Solvent cleaning: According to the production requirements of different varieties, vacuum suction an appropriate amount of solvent into the kettle, raise the temperature for full reflux, and collect the appropriate amount into each collection tank. Pay attention to sampling and analysis before and after refluxing; after solvent cleaning, vacuum is also used. The drying method is used for drying, and the drying temperature and time are determined according to the conditions of the solvent used.
Check confirmation: After the analyst passes the equipment inspection, the cleaning operation is considered to be over; otherwise, repeat step 7 to clean again until it passes.
Before putting into the equipment, the staff should carefully check the equipment to ensure that the safety accessories are complete and the vacuum degree meets the requirements.
Shower cleaning: Shower cleaning is a cyclic cleaning technology. During the cleaning process, the chemical cleaning solution is evenly sprayed on the inner surface of the cleaning system, and the gravity of the cleaning solution flows along the container wall to the bottom, so that the cleaning solution and the inner wall of the container are Full contact, chemical reaction occurs, and the tower meets the requirements of the cleaning system. By adjusting the position of the spray head, the cleaning liquid can be sprayed to the ceiling and inner wall of the container, thereby maintaining the cleaning degree of the whole container.
Circular cleaning: Circulating cleaning takes the cleaning pump station as the power source, and the cleaning fluid is circulated in the cleaning system to make the cleaning fluid react with the oil stains on the inner surface of the equipment and pipelines, so as to achieve the purpose of degreasing.
The wind deflector is a part on the chimney. In order to avoid or reduce the resonance of the chimney caused by the Karman vortex caused by the airflow, the upper section of the chimney is welded with spiral wound strips or fins. There are also axial arrangements.
When the fluid flows laterally through the cylinder, vortices are generated alternately on both sides of the back of the cylinder, and after separation, a vortex tail is formed, also known as "Karman vortex".
The chimney design should avoid resonance caused by eddy currents. Increasing the stiffness of the chimney or adding a concrete lining can improve the chimney's resistance to vibration. But a more effective method is to weld a helical outer "windshield" to the top of the chimney.
Jiangsu Kaitong Boiler and Pressure Vessel Co., Ltd. is mainly engaged in non-standard vessels, towers, condensers, chemical equipment, steam boilers, electric boilers, hot water boilers, heat exchangers, low nitrogen boilers, reactors, storage tanks, Gas storage tanks, high-efficiency heat exchangers, etc. In line with the corporate philosophy of "creating green energy equipment for human beings and creating technological products for the industry", the company always adheres to the operation of "market-oriented, innovation-driven, quality-based survival, and development-oriented growth". The concept, will rely on the continuous innovation of science and technology and advanced modern management concepts, to produce high-quality, high-performance boiler and pressure vessel products, as well as good service to win the trust of the majority of users; willing to work together with the majority of users, mutual benefit, Work together to create a brilliant future for the enterprise.