Is it possible for natural gas to contain hydrogen sulfide?
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The raw material required for PSA hydrogen production in our facility is coking dry gas; when this gas is insufficient, natural gas is used as a supplement. Recently, the hydrogen sulfide levels in the sampled raw gas have sometimes exceeded the specified limit (by more than 50 ppm), which is due to low pressure of the dry gas at the time of sampling, resulting in some mixing with natural gas. Everyone suspects that poor desulfurization processes in the coking unit are responsible for the high hydrogen sulfide levels in the coking dry gas. However, the samples of dry gas from the coking unit meet the standards, with very low hydrogen sulfide content. Samples of natural gas were taken from both the area where it enters the facility and from the natural gas buffer tank for analysis; the hydrogen sulfide level in the natural gas from the entry area was above the limit, while that in the buffer tank was zero. Where does this hydrogen sulfide in the natural gas pipeline network come from? Have you guys encountered something similar? (Natural gas is the kind we use for heating at home.)
When it comes to natural gas, it is always associated with desulfurization and sulfur recovery units; I’ve never heard of any natural gas that does not require desulfurization. It’s also possible when the removal isn’t done properly.
**The standards for natural gas are specified in the standard GB17820-2012 for Natural Gas: for Class 1 natural gas, the total sulfur content is ≤100 mg/m3 (on a sulfur basis)； For Category II goods, the total sulfur content in natural gas is ≤200 mg/m3 (on a sulfur basis) ； The total sulfur content in natural gas for these three categories is ≤460 mg/m3 (on a sulfur basis)
Natural gas contains sulfur originally, and it is desulfurized before being released onto the market; if the desulfurization process is not thorough enough or is not done properly, it is entirely possible for sulfur to remain present.
Previously, hydrogen was often produced using natural gas as a raw material, while coking dry gas was used as fuel for heating the furnaces; at that time, the raw gas sample consisted entirely of natural gas, with methane accounting for over 93% of its components, and the hydrogen sulfide content was zero. This led me to mistakenly believe that natural gas was quite pure. Thank you!
What types of natural gas are commonly used for cooking at home?
Types 1 and 2 can be used as household gas; when used for this purpose, odorizing agents such as thiol and thioether compounds must be added. Industrial, odorless.
Types 1 and 2 can be used as household gas; when used for this purpose, odorizing agents such as thiol and thioether compounds must be added. Industrial, odorless. Civilian odorization is done for safety, to help detect leaks, right?
The sulfur content in the natural gas here is around 10 ppm
We don’t have any requirements regarding natural gas here; it’s probably always up to standard, so no one seems to care.