Which ones are purged with nitrogen for chlorine-hydrogen startup?
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This post was last edited by sunjl1981 on 2013-1-6 at 19:51. The pipes and equipment used in chlorohydrogen operations must be purged with nitrogen before use; what is the acceptable standard for such purification? Please share your opinions. # ， ， &
Chlorine is not necessary; for hydrogen systems, it is required to perform purging and analyze the oxygen content to ensure it is within acceptable levels before operation can begin. All the equipment and pipelines in the system need to be replaced – are you really willing to take the risk of saving some nitrogen? ?
Before starting up the chlorohydrin process, those pipes and equipment must be purged with nitrogen; for safety reasons, all pipelines and equipment need to be purged. The chlorine system also requires this to prevent residual air in the pipes from entering the hydrogen system due to employee errors. What is the number of qualified indicators for replacement? Oxygen content less than 3%
The air must be completely removed using safe nitrogen; this is necessary for safety. In the factories I’ve been to, the oxygen content is less than 1.5%
The hydrogen used must be purged with nitrogen. The oxygen content is below 2%.
Hydrogen pipelines must be purged with nitrogen, and power can be supplied only when the oxygen content is within the specified limits.
Check the explosion limit to find out what range it should be kept within
All pipeline equipment in the hydrogen system must be purged. Chlorine pipelines are unnecessary. Generally, chlorine systems are not connected to hydrogen systems, so there is no risk of residual air in the pipes entering the hydrogen system due to employee errors. If that is the case, improper operation by employees while driving could also result in a mixture of hydrogen chloride and chlorine, creating explosive gases.
Generally, hydrogen system purging requires an oxygen content of less than 1%
The ion-exchange membrane hydrogen main pipe begins to be filled with nitrogen up to the hydrogen compressor, all the way to the HCL synthesis furnace; operation can proceed as long as the oxygen content is below 2%
The entire hydrogen system must be purged with nitrogen.
When starting up the hydrogen system, all hydrogen and cathode systems must be purged with nitrogen. The hydrogen compression section also needs to be purged, by venting it during the hydrochloric acid process; when performing the purge, attention must be paid to maintaining stable pressure differences!
When purging the hydrogen system’s pipelines and equipment with nitrogen in the electrolyzer cathode system, attention must be paid to the pressure difference between the anode and the cathode
Indeed, there is no need to purge the chlorine pipeline, unless major maintenance requires the use of exhaust fans to displace the accidental chlorine； The hydrogen system must be completely purged for safety reasons, with no corners left unaddressed; generally, this process involves filling it with nitrogen through electrolysis and then venting hydrogen chloride. Each plant has its own method for purification, but in any case, the oxygen content must be within acceptable limits. Be sure, however, to keep the oxygen content in nitrogen below the specified limits; otherwise, it will have the opposite effect and lead to safety accidents.
Hydrogen main pipe \ Hydrogen treatment \ Hydrogen buffer tank \ Before combining with hydrochloric acid, the synthesis furnace must be thoroughly purged; the oxygen content should be determined based on the purity of nitrogen, ranging from 1% to 3%.
The replacement of pipes in the hydrogen system must be carried out in a step-by-step manner. Only after the analysis and sampling of the electrolytic hydrogen pipes show satisfactory results can nitrogen be used to replace the hydrogen in those pipes. Pay attention to the dead zones of certain control valves; open these valves and carry out the replacement process for 5 minutes. The acceptable standard is that the oxygen content in the nitrogen should be less than 1 percent! This post was last edited by limingshuguang on 2009-4-13 12:52.]
The air must be completely removed using safe nitrogen; only then is it safe!