Control of slurry spillage

Is the oil slurry, after being replaced, first vaporized and then cooled in an external heat exchanger before being discharged?； Is the pre-extraction external cooling process one in which the oil slurry is drawn directly from the bottom of the distillation tower, cooled in an external cooling unit, and then extracted? Is the external discharge after replacement due to the temperature of the slurry outlet device exceeding the specified limits, which triggers its operation? ； As long as the oil slurry for pre-extraction meets the requirements for external discharge, the pre-extraction external discharge system is put into use. Emergency dumping, also known as the “emergency line,” is used only in accident situations, when the liquid level in the distillation tower is high, to control that liquid level. Under normal circumstances, emergency bypass lines should be regularly checked to ensure smooth operation.

Is the oil slurry, after being replaced, first vaporized and then cooled in an external heat exchanger before being discharged?； Is the pre-extraction external cooling process one in which the oil slurry is drawn directly from the bottom of the distillation tower, cooled in an external cooling unit, and then extracted? Is the external discharge after replacement due to the temperature of the slurry outlet device exceeding the specified limits, which triggers its operation? ； As long as the oil slurry for pre-extraction meets the requirements for external discharge, the pre-extraction external discharge system is put into use. Emergency dumping, also known as the “emergency line,” is used only in accident situations, when the liquid level in the distillation tower is high, to control that liquid level. Under normal circumstances, emergency bypass lines should be regularly checked to ensure smooth operation

From the perspectives of energy conservation and safety, the discharge of slurry oil should take place after passing through a heat exchanger and a slurry oil steam generator. The temperature at which the slurry oil is discharged is generally kept at no more than 110°C, in order to prevent sudden boiling in large tanks and fire accidents； If external cooling is used before the change, it will increase the load on the external cooling units or cooling tanks; moreover, a large temperature difference can cause severe scaling on the outer walls of the pipelines, thereby affecting the cooling efficiency ； The diameter of the emergency discharge line is larger than that of the slurry discharge line; it is used to ensure safety in case of an accident or when the liquid level at the bottom is too high. Under normal conditions, the emergency discharge line must remain unobstructed, and it is advisable to clean it regularly.

Regardless of the type of deviation, corresponding actions are taken based on indicators such as the temperature at which the slurry is discharged, the liquid level in the distillation tower, and the solid content of the slurry.

It’s a simple question: it can be understood literally – regular ejection and emergency ejection. I’ll just think about cleaning the wires after using it.

It can be divided into the following situations: 1. Before starting up, the slurry is sent through the external line to the crude oil, enabling an open-loop circulation until it reaches the tank farm. 2. During normal production, the amount of slurry discharged is controlled based on the solid content of the slurry, which is generally less than 6, as well as operational requirements. 3. In case of abnormal conditions, the slurry transfer line serves as a \"lifeline\"; after feeding is stopped, the crude oil enters the distillation tower and then reaches the tank area via the slurry transfer line. 4. Additionally, during normal operation, the slurry follows a three-path flow: first, it enters the riser for reaction ； Secondly, feed into the fractionation tower from above or below and return it to the tower ； Third, after cooling through the cooler, the temperature is generally below 90 degrees, after which it enters the slurry tank in the storage area.

Front external swing: the starting path cycle line at the beginning of operation； Back outer swing: the line for swinging the slurry during normal production ； Emergency vent line: It is a line that leads outside the device in case of an accident.

Forward transfer: goes directly to the tank area at the start of operation. Backward transfer: goes to the tank area after heat exchange during normal production. Emergency transfer: goes directly to the tank area in case of any abnormalities in production

The amount of external discharge is controlled based on the solid content of the slurry. Decide which wire to use depending on the situation.

We generally keep the slurry yield at around two percent; of course, this also depends on the properties of the raw materials, and the solid content in the slurry does not exceed the specified limits. In my opinion, if the solid content of the slurry exceeds the allowable limit and it is necessary to control it by removing a large amount of material from it, then operations should be stopped for maintenance; otherwise, it can be very dangerous.

When it’s not possible to lower the liquid level, there’s no longer any distinction between different types of discharge methods; all of them are used. . . Hahaha. . . :lol

After the oil slurry is replaced, it is vaporized, then cooled in the product rejection heat exchanger before being rejected； Pre-extraction external discharge involves the direct extraction of the slurry from the bottom of the distillation tower, followed by cooling it in a slurry steam generator before performing external discharge. Emergency dumping, also known as the “emergency line,” is used only in accident situations, when the liquid level in the distillation tower is high, to control that liquid level. Under normal circumstances, emergency bypass lines should be regularly checked to ensure smooth operation.

The external discharge of the slurry before heat exchange refers to the fact that a separate stream is taken directly from the outlet of the slurry pump and sent to the filling area after cooling; the required cooling temperature should not exceed 130 degrees； The back-outside discharge of the heat exchanger refers to the process in which, before returning to the tower, a portion of the slurry is diverted and cooled before being sent to the filling area; this method helps to reduce the load on the cooling tanks ； However, the fluid linear velocity is low, making the pipelines prone to coking ； The emergency bypass also occurs after the heat exchanger, with a branch leading to the irrigation area via a cooling tank. In terms of design, the inner diameter of this pipeline is larger than that of the upstream and downstream pipelines, and there are no control valves on it. In the event of an accident and the normal oil slurry bypass system is not sufficient, the emergency bypass can be activated by simply opening the manual valve.

In our factory, the discharge of slurry takes place either before or after the slurry replacement. I wonder if the factories of other experts also use such a design for discharging slurry What is the difference between the external discharge before slurry replacement and after replacement? Under what circumstances is each one put into use?

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