Sulfur Daily Question, May 19------3 points for participation, 10 points for a correct answer
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This post was last edited by Sulfur-Zinc-Aluminum on 2016-6-3 11:08. What are the causes of an increase in the liquid level at the bottom of the acidic water stripping tower, and what are the solutions?
Increased inbound traffic: Stable inbound traffic； Decreased export flow: Stable export flow ； False instrument readings: Controlled by on-site level gauges and instrument maintenance ； Sudden drop in tower top pressure: Identify the cause to stabilize pressure ； Low steam temperature: Adjust to normal
Acidic water carrying oil, or high steam volume and pressure in the reboiler, can cause tower flooding; in severe cases, operations must be halted, while in milder cases oil skimming needs to be intensified along with adjustments to the steam supply
Reason for the increase in the bottom liquid level of the stripping tower: decrease in tower pressure； Excessive backflow ； The temperature at the bottom of the tower decreases ； The opening degree of the external delivery valve is low. Solution: Analyze the cause and take corresponding action.
1. The heating supply to the reboiler at the bottom of the tower is insufficient; solution: increase the heating supply； 2. Excessively high tower pressure; solution: reduce the top pressure of the tower ；
The amount of heating steam in the stripping tower is insufficient, resulting in a high gas volume in the acidic water； Solution: Increase the steam heating amount at the bottom of the tower or raise the heating temperature
Large feed rate, control valve failure; reduce feed rate, adjust the width setting
Faulty bottom pump or clogged filter screen at the bottom pump inlet. It may be caused by low water consumption in downstream devices. Or leakage in the bottom reboiler.
Taking advantage of the fact that hydrogen sulfide and carbon dioxide have a higher relative volatility than ammonia and a lower solubility than ammonia, carbon dioxide in the wastewater is first vaporized from the upper part of the stripping tower, while the gaseous ammonia at the top of the tower is absorbed by cooling water. By controlling the temperature distribution in various sections of the tower, an ammonia concentration zone is created in the middle of the acidic wastewater where the NH3/(H2S+CO2) molecular ratio is greater than 10, allowing for extraction and separation there
Reason: 1. Insufficient heat source at the tower bottom, resulting in low temperature at the tower bottom. 2. The filter screen of the bottom pump is clogged. 3. Fluctuations in tower top pressure. 4. The feed rate increases. 5. The reflux flow rate to the stripping column increases. 6. The remote display of the bottom liquid level is inaccurate. Treatment: 1. Increase the heat source at the bottom of the tower to raise the temperature there. 2. Switch to the standby pump to carry out filter cleaning operations. 3. Control the top pressure properly to maintain a stable gas-liquid phase equilibrium and ensure smooth operation. 4. Control the feed rate to the stripping tower. 5. Reduce the reflux flow rate of the stripping column. 6. Contact the electrical and instrumentation team to handle the instrument.