The pressure in the tar distillation column keeps rising

To be more specific, is it a fractionation tower or an industrial naphthalene distillation tower? Is the topping off at the tower operating normally? Check whether the product quality at the bottom of the tower is satisfactory; if everything is normal, then check whether the instruments are functioning properly.

First reduce the volume and lower the temperature, then conduct a thorough inspection and analysis by checking the pressures at the top and in the middle of the tower

The question is a bit vague, but if there are no issues with the equipment, etc., and this happens every time the operation starts, then as long as the operation proceeds normally, it indicates that the heating rate is too fast; following the prescribed heating rate will resolve the problem. If there are changes in equipment, material properties, production load, etc., a comprehensive analysis taking all relevant factors into account is necessary.

Whenever the pressure in a tower increases, the first step is to reduce the heat input, and then other causes are investigated: moisture content in the raw materials, blockages at the outlet, etc.

Operations should be carried out in accordance with the standard procedures, and it is very important to have practical and effective procedures in place. First of all, it is essential to ensure that the oil collection pipes are unobstructed; then the feeding process can begin at a rate lower than the designed level. Temperature increase should follow the specified curve (special cases may require special handling). Various heat exchangers and coolers need to be preheated using steam as appropriate, after which water can be gradually introduced. The operation of various vent systems and the control of various process parameters are also all important aspects. The situation you mentioned probably occurs during driving; will things return to normal once that’s over? It means you didn’t prepare well before starting work and drove too fast; if this continues, there might be a problem with your equipment.

At the start of operation, the pressure in the tar distillation fractionation tower kept rising

What measures should be taken first to relieve the pressure?

Does the three-way cooler have a vent? If the pressure is really high, try releasing it from there

The friend upstairs is right; first find a place to release the pressure, and then take other measures

Is the tower pressure at the top or the bottom of the tower? If it’s at the bottom, is the tray blocked?； If it is at the top of the tower, could it be due to moisture in the tar or a blocked gas-phase pipe?

Generally, one should not look for a place to release pressure, as the pollution resulting from that would be severe. The residents nearby are going to cause trouble.

Releasing pressure is a last resort; it’s okay to do so for a short period of time, and it should be turned off once normal operation resumes. The person upstairs is right – we need to protect our environment, not just because we’re afraid of residents complaining

A high pressure in the distillation column is likely due to water present; is the pressure in the second stage relatively high? At this time, attention should be paid to replacing the tar (by taking measures such as adjusting the tank), with special focus on the flashing process in one section of the evaporator; this flashing process also serves as a pre-dehydration step, and the light oil produced by flashing should not be added yet.

The reasons are generally: 1. The temperature rises too quickly; 2. There is water present – check whether the pressure in the secondary evaporator rises rapidly; 3. The tubes behind the condenser are not unobstructed; 4. There is a problem with the pressure gauge

1. High moisture content. 2. Check the pressure transmitter. 3. Cooling water to the cooler is not flowing. 4. The drain valve behind the light oil cooler is closed

If the pressure increases only at the start of operation, it indicates a rapid increase in temperature and a high gas-phase load; the temperature should be increased slowly

First, reduce the heating and decrease the feed to see if there is any change. If there is a change, then check whether the raw material contains water. If there is no change, it may be a problem with the pressure gauge. When a heat exchanger is in use for a long time, factors such as rust after it is shut down reduce its heat exchange area, which can also have an impact.

The chain of reasoning analyzed upstairs is quite strong; nice