What raw material pipelines at refineries need electric heating

Published on:

2023-03-13 11:44

In cold regions, more attention is paid to heat conservation of pipelines of oil refineries and processing plants, but often do not pay due attention to the need to increase heat conservation.

The main purpose of the electric heating of the pipeline is to compensate for the heat loss of the environment during transportation, to maintain the necessary temperature, to prevent freezing and freezing of the pipeline. In cold regions, to add heating pipes, it is necessary to remove the finished layer of insulation, which not only leads to the waste of labor and material resources, but also affects the construction time. Sometimes, due to the limitation of the pipe trestle and the distance between the pipes, it is difficult for the project to be repaired to meet the design requirements and expected results. After some devices have been put into production for a long time, various low-speed heating pipes are still added to keep the device running.

The above situation is more noticeable in the catalytic cracking unit, because there are many types of piping in this plant, and their number is large. In the production process, the catalytic cracking unit has several production plans, and the operation is flexible. And interchangeable. Pipelines are sometimes in different working conditions. In addition, the temperature varies from place to place, and the temperature varies from season to season, which complicates the construction of heating the pipeline. In addition, fundamental norms and instructions have been made in the current design technical conditions for the electric heating of pipelines. Therefore, when designing, work must be combined with the real situation in order to make a judgment.

The raw material for a catalytic cracking unit is usually a variety of paraffin oils, heavy oils, or mixed oils. Its freezing point is relatively high, and it does not flow at room temperature. The temperature of these oils is above 90 °C. As it is fed, the flow rate is constantly changing, and sometimes the transport may be interrupted, but is not suitable for immediately purging., the IAO pipeline must be added by a heating line. After the raw material is heated, the temperature becomes relatively high, and the pipeline entering the reaction riser cannot be equipped with a heating line. But his crash is returning to the west line because the flow rate is changing so much so a heat line needs to be added. Other feedstock system pipelines in the Alpine region, such as the start-stop cycle line, the heating line, and various auxiliary lines used in abnormal conditions, require heating lines.

Many existing installations, especially heavy oil catalytic cracking units, although equipped with furnaces to heat the feedstock, are shut down in normal production, and only open at start-up or abnormal temperature increases, so heating furnace inlet and outlet pipes to cold regions A heating pipeline is also required.

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