Sharing of experience in the construction of low-temperature methanol washing plants

1. Leak testing of the liquid collection tanks must be carried out for the methanol washing tower, carbon dioxide desorption tower, and hydrogen sulfide concentration tower. 2. When purging a coil-type heat exchanger, be sure to take precautions to avoid blockages.

The internal structure of the equipment must be carefully inspected to prevent the presence of surface defects such as pores; special attention should be paid to the areas where the tray supports are located (based on experience from other departments)

Pay attention to the material selection for key parts. The flushing water operation must be thorough.

Nitrogen purging of the system after water interconnection is also very important; otherwise, the water content in the methanol-poor stream will be high after operation begins.

The flushing water operation must be thorough. Then cry if you want to! Solution contamination can be completely normal!

Special attention must be paid to the installation of the tower internals, as it affects the operational performance of the entire system

Care must be taken when installing the trays in several towers; otherwise, the absorption and desorption performance will be affected.

So what issues should be taken into account during the design process? For example, what about the drawing review, as well as the preliminary design, detailed design, and construction drawing design stages?

This post was last edited by 654262293 on 2010-7-8 08:14. Strict attention must be paid to the installation of the trays; their levelness, as well as the clearance at the bottom and sides, must be checked in accordance with the design specifications. After the trays are installed, any slag or welding wire residue must be removed, as otherwise it will affect the efficiency of heat and mass transfer.

The review of the preliminary design drawings is relatively simple: similar processes are identified, and the drawings with high loads are compared to determine whether the PFD material parameters meet the process requirements. It is also checked whether the material, size, and design of the equipment satisfy the production needs, as well as whether the pipe diameters, materials, valves, venting arrangements, and instrument parameters are appropriate. Additionally, it is ensured that there are sufficient utility facilities. Those with engineering experience can point out issues from previous projects and suggest improvements during the design review. In the preliminary stage, the opinions of the design institute play a key role, with the owner’s input serving as a supplement; of course, if the owner has experience and believes that there are problems that need to be corrected, they can certainly raise those concerns. Afterwards, it is checked whether the information provided in the design contract and according to Sinopec’s design standards meets the required criteria. The drawing review prior to detailed design focuses on various aspects: the equipment layout has been finalized, so it is necessary to check whether the piping routes are reasonable; it is also important to ensure that the connections for instruments and drain lines are consistent with those specified in the PID. The materials used for pipes and fittings need to be assessed and classified, and it is required to verify whether all the information needed for each piece of equipment is provided in the drawings, with a summary prepared for each unit. I really don’t have much experience in civil engineering, as by that time I was already leading teams in carrying out training; when I returned, it was already at the stage of receiving equipment and installing pipelines.