Is hydrogen recovery subject to inspection?
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During the polysilicon production process, the hydrogen gas produced in the reduction furnace needs to be recycled. I wonder if it is tested?
Testing is definitely necessary; otherwise, what is the basis for designing the hydrogen recovery system?
I’m not quite sure how the reduction furnace is doing! But judging from the situation in our workshop! It definitely needs to be tested!
It must definitely be tested; there are also requirements for the hydrogen that enters the conversion furnace.
Let’s share the test results – do they meet the requirements? :handshake
Online testing is required to provide results immediately; impurities should be below a few hundred ppm
It generally detects trace amounts of oxygen, total hydrocarbons, and other impurities, usually on a PPM scale
Testing is necessary; the main function of the CDI (exhaust gas recovery system) is to separate various chlorosilanes and hydrogen that have not fully reacted in the reduction furnace. The criteria for this separation determine the performance of the CDI. If testing isn’t done, then what’s the point of having a CDI? Hehe
Testing is definitely necessary, but it’s greatly influenced by the instruments and testing methods, and often fails to provide meaningful results.:)
What needs to be tested. It mainly depends on the effectiveness of the recycling system and the impact of hydrogen quality on polycrystals
Because I feel that the components of the gas coming out of the reduction furnace are relatively clean, and the hydrogen obtained after separation contains only small amounts of other components, which have little impact on the overall reaction; therefore, I don’t think it’s necessary to conduct testing.
It is not only necessary to detect the impurity content, but also HCl. The content of TCS\DCS\TET; otherwise, what’s the purpose of an activated carbon adsorption tower? ? What do you think?
Based on the situations in other units, generally the quality of the hydrogen recovered is better than that of the hydrogen produced, so it is rarely tested.
The last edit to this post was made by 181128425 on 2009-7-23 at 13:30. In the design of CDI, three adsorption towers are required for a capacity of 1500 tons; in actual production, we have already added three such towers, and we plan to add three more. Our process specification is less than 1 ppm. However, in production, as long as the material is regenerated properly, no other impurities are generally detected. Only nitrogen. Company confidential data; extra points are highly recommended
Testing is still necessary, unless practical experience during production shows that the hydrogen obtained after reduction meets all the specifications after separation