Causes of poisoning in hydrogen production pre-conversion catalysts and countermeasures
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As is well known, during the pretreatment stage of hydrogen production raw materials, the feed gas has already been thoroughly purified. However, after entering the pre-conversion reactor, it is necessary to adjust the ratio of superheated steam; what are the requirements regarding the quality of the steam? What are the requirements for the parameters of desalinated water? How to protect yourself? What kind of equipment or processes are used? Please explain in detail.
Control of S. Less than 0.1ppm
Do you have any process improvement measures?
We produce hydrogen from natural gas: one hydrodesulfurization reactor, followed by two zinc oxide beds in series. An online S analyzer is installed after the zinc oxide bed. The S content can be viewed in real time. No issues with S exceeding the limit have occurred during 13 years of operation. No copper oxide is used for precise desulfurization; if it is necessary, you can discuss this with the catalyst manufacturer, who will generally be able to give you advice. The steam will go directly into pre-conversion and conversion; we require: SiO2
Actually, my main idea is to understand how chloride ions in steam are controlled.
Chloride ions cannot be detected; it is likely that the accuracy of your analysis method is insufficient. In fact, these chloride ions cause significant damage to the pre-conversion catalyst
Yes, but regarding water quality, do you have any good measures to control the quality of the steam?
For Cl in the pre-converted feed material, use ASTM D4929 combustion coulomb method； Cl in steam is determined by ion chromatography. Detectable
The requirements for deionized water are a salt content of 5 μS/cm and a chloride ion concentration of 0.1 mg/L.