Looking for online testing and analysis instruments
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Our company is working on a project that requires online monitoring and analysis instruments. Some people also refer to them as process analysis instruments; I’ve looked for some manufacturers, but none seem suitable. I hope the experienced members of this forum can offer some advice. The content to be measured is the urea content in urea aqueous solutions with a concentration of 5–60%. The temperature and pressure at the two locations are 80°C at normal pressure, and 180°C with 20 kilograms of pressure. Another gas analyzer is used to measure the ammonia content in a pipeline that contains a mixture of ammonia, carbon dioxide, and water vapor. The temperature is 160~180°C, and the pressure is 20 kilograms. Thank you all, seniors. Please recommend some methods and manufacturers. Thank you.
Does no one know? Asking again
Check out the information here: you should be able to find the answer: http://bbs.hcbbs.com/search.php?searchid=1337&orderby=lastpost&ascdesc=desc&searchsubmit=yes
Using ABB’s or Siemens’ online instruments should work, right?
The first type mentioned by the poster isn’t very clear; the second one is an online gas analyzer that measures the purity of ammonia, using infrared analysis technology. However, pre-treatment is required before analysis can take place. You can contact me via email at 407565000@qq.com
ABB is recommended, but it’s not necessary to work directly with ABB itself; their agents can be used instead.
This post was last edited by qugd on 2010-1-24 at 10:39. Personally, I think what the people mentioned above said is a bit too subjective and simplistic. It’s a bit rude to doubt that Mr./Ms. Cai from Bayer is capable of coming up with a plan; I hope you don’t take it personally. You may not be very familiar with the techniques used by the original poster; this is a typical analysis of the urea synthesis process, and it’s not as simple as one might think. Sample handling in the online analysis systems used for urea synthesis is quite complicated, as it involves substances in gas, solid, and liquid states. It’s not easy to carry out analysis without affecting the composition of these substances. For the first analysis, since it is an aqueous solution of urea, there may also be some unconverted ammonium liquid (urine) present. When the mixture cools down, it crystallizes and can block the sampling lines; therefore, sampling for analysis is not recommended. Instead, it is suggested to use a mass flow meter to directly measure the density, with the density and temperature values being obtained. These values can then be converted into the urea concentration by comparing them with appropriate empirical values. An online density meter can also be used, but this requires accurate temperature control and heating for the sampling pipeline (using electric heating with temperature control); the sample return pipeline also needs to be heated, and the density meter must have an automatic temperature compensation function. For the second analysis, since Mr./Ms. Cai said their company has the capability to handle this, let’s leave it to Mr./Ms. Cai’s team at Bayer to carry it out first. If it cannot be resolved or the results are not good, I will put forward a few more suggestions.
This post was last edited by latitude on 2010-1-25 13:46. I would like to state upfront that I am a man. Secondly, those upstairs should be more careful with their words. If you’re so capable, then just give a solution directly. Stop standing here talking without taking any action, and stop talking nonsense. Do you know what online near-infrared and laser instruments are? If not, I won’t waste time explaining it to you.
This post was last edited by qugd on 2010-1-25 20:40. At least I have provided a very viable solution. I really don’t know what online near-infrared and laser instruments are; what kind of high-tech technologies are these? I haven’t had much education; could you give me some advice? Are you working on near-infrared research or its applications? Are you using the laser to measure distance or to correct alignment? Is it also used to determine a certain component in a gas? If there are things you don’t quite understand, I can consider giving you some Chinese materials to read first. If there are any practical analysis issues, I can also find some solutions I developed a few years ago for your reference. As for sample processing, I guess it’s pointless to tell you. We can discuss this again once you have some knowledge of chemical engineering processes. It’s all the truth; don’t get angry. These days, those who are willing to tell you the truth straight away deserve to be called teachers. Also, why did you delete your own post? Were you afraid that laypeople wouldn’t understand it? It’s not that I’m not willing to provide a plan; I’m just giving you the chance to come up with one first. Don’t you have a team? They are far more capable than I am.
I’d like to say a few things as well: For the first measurement, I thought using density might work, but it’s just an empirical value. How can the density value be converted into a urea concentration value in this process? What is its formula? Is it still a point-to-point correspondence? I don’t know what significance this concentration value holds for industry, or to what extent a deviation in the concentration value is relevant for making adjustments to the process And why can’t samples be taken for analysis? I think the second measurement relates to the focus! Is it really that difficult? I think it’s true that preprocessing is quite difficult, but near-infrared light can theoretically also be used, right? As for using a laser, that’s not quite right, is it?
As for the solution to the second problem, I’m not sure how far Mr. Cai’s team has progressed with their research. I’m very much looking forward to seeing what successful solution Mr. Cai will come up with. I guess he has already gone through the information on online near-infrared and laser analyzers; are there any words he doesn’t recognize?