What aspects should be paid attention to when starting up the methanol washing process?
Thread Content
This post was last edited by xuqinger on 2009-7-28 at 17:08. Two years after graduating, and after half a year of practical training, as well as one and a half years spent studying abroad and undergoing local training, I officially became an assistant operator for methanol washing processes and participated in the commissioning of the plant. What things should one pay attention to learning while driving? Are there any learning methods you can share? Thank you to all the seniors.
The main topic should be clear, and the issues should be stated more explicitly
There are too many things to pay attention to, such as system pressure, temperature, flow rate, etc. Please be more specific
Fu Cao? It is necessary to know the location of each control valve, drain, pressure gauge, temperature gauge, temporary connection pipeline, boundary valve, etc. at the site, as well as the shortest route to reach them. Before operating each valve, it is important to understand which areas or locations will be affected by its operation. You have done all of these, and then you can graduate
Temperature, liquid level, and pressure are essential. Most importantly, the composition of the output gas matters; in the case of methanol washing, it’s necessary to remove unwanted substances from the gas stream. These aspects must definitely be ensured. Also, pay attention to the amount of methanol circulating – it shouldn’t be adjusted arbitrarily based on changes in the feed gas, as that can lead to instability. As an assistant operator, it’s crucial to follow instructions and know who should give those orders. Never take action without instructions, as no one can afford to take responsibility for such actions. Even if there are instructions, it’s not acceptable to act blindly or fail to act at all
If it is before establishing the methanol cycle, it is important to analyze the oxygen content in the system before introducing methanol; it is also advisable to determine the water content by measuring the dew point. Before establishing a circulation cycle, it is necessary to verify the valves; the high-pressure area must first be pressurized to above 4.0 MPa to ensure that a circulation cycle can be established. It is very important to confirm the valves, so as to avoid confusion before starting the circulation for the first time. The manual valves on site must not have any limiting functions; all control should be carried out from the control room, which helps to reduce a lot of unnecessary repetitive work.
The effects of the methanol circulation rate and circulation temperature on the outlet composition can be simply understood as the mutual influences among temperature, pressure, flow rate, and composition; once these are understood, there’s not much else to consider. The key to studying chemical engineering is to have one’s own approach; otherwise, you might be able to memorize all the instruments associated with each drain valve, but when something goes wrong, you won’t know where to start analyzing it. Be diligent in thinking; everything around you can be a source of knowledge. Also, don’t focus solely on the unit you are studying; if you have time, it’s better to take a close look at the preceding and subsequent units as well. Those who do not plan for the future will surely face problems soon. Often, issues arise from sources outside that particular unit, and if you don’t understand those aspects, it will be difficult to handle things properly. For example, sudden increases or decreases in the load of the vaporization furnace, as well as the temperature and pressure at the outlet, can affect your operations. Even if you can’t delve into detailed studies, it’s still a good idea to have some basic understanding of other processes as well
The main focus is to understand the process of low-temperature methanol washing and the key control methods, as well as to be familiar with the control points. Many new issues arise during operation, but the fundamental principles remain the same: it is essential to maintain proper control of the low temperature, and at the same time, effective control over the regeneration of methanol is also necessary. Generally, liquid level control in driving is the most important, as otherwise normal methanol circulation cannot be ensured. Treat specific problems specifically; to a certain extent, all problems conform to general principles. Good luck; I’m a beginner too.
In low-temperature methanol washing, the main things to pay attention to are the regulation of temperature, pressure, liquid level, and flow rate. There are no chemical reactions involved; it’s entirely a physical adjustment process. It may seem simple, but in reality its values can fluctuate significantly due to the influence of the systems before and after it. I fully agree with the view expressed on floor 7.
Thank you to everyone above; now our load has reached 80. Hehe
I think there’s no need to go into detail about the process parameters; what’s most important is to learn the approach to regulation, how to ensure that these parameters are met, and how to optimize operations once those parameters are satisfied in order to further reduce production costs. Another aspect to consider is accident handling – analyzing the causes of accidents and so on.