Chlorine and titanium
Thread Content
This post was last edited by 1qaz2wsx3edc on 2018-3-4 at 13:38. Seeking advice on how to prevent the compressor from stopping suddenly during chlorine treatment, so that dry chlorine does not mix with wet chlorine and react with titanium materials. Including pouring chlorine back from the large return point.
We are mainly concerned about dry chlorine reacting with titanium equipment; our wet chlorine main pipe is made of titanium
Add online chlorine moisture analyzers, using a redundant design to ensure that the chlorine maintains a certain level of humidity. When the humidity is below the set value, either humidity is increased for the chlorine gas through humidification measures, or the system shuts down automatically to cut off the gas supply.
The outlet check valve or switch valve is used for interlocked shutdown, or both are employed as a double safety measure. There is also a bubble column; due to the level of acid in the bubble column, the acid can only be returned to the front through the acid overflow tube inside the column. More importantly, there is a risk that this reverse flow could cause overpressure in the equipment of the drying system.
The use of large system backflow during normal operation is not recommended; the backflow provided by the turbine itself is more than sufficient to meet the control requirements! The starting point of the large reflux should be before the check valve in the original chlorine pipeline (to prevent chlorine from flowing back through the reflux pipeline after the turbine stops), returning to the water mist catcher and then in front of the packing tower!
The current manufacturing process can fully ensure system safety, so there’s no need to worry; the vast majority of manufacturers use titanium materials.
We use a liquid-ring chlorine compressor; the check valve is located at the top of the chloric acid separator. When the machine is shut down, the chlorine gas from the chloric acid separator flows into the wet chlorine main pipe. There is also a large reflux flow that returns from the chlorine distribution station to the bubble column, and this flow is regulated using control valves!
If there is anything wrong, please advise me. This prevents the compressor from shutting down and stops dry chlorine gas from entering the wet chlorine gas stream. It happens because the large reflux flow causes the dry chlorine gas at the compressor outlet to flow back to the outlet of the acid mist collector at the compressor inlet, resulting in high pressure at the outlet and thus reverse pressure. At this point, the large return flow should be shut off as soon as possible, followed by pressure relief of the system
Is there a shut-off valve in front of your main return control valve? The control valve closes slowly, while the shut-off valve closes quickly; in the event that the control valve leaks
The single-unit check valve for the Naisch pump is located above the outlet separator; it is a ball-type check valve! The small backflow in a single Na-type pump occurs as fluid returns from the separator to the front of the pump; it is needed for single-unit testing and for increasing pressure during startup. Since there is a check valve on the separator, no pressure bypassing occurs due to this small backflow! Similarly, this is also the case for the large reflux in the system; a check valve must be placed after the starting point of the reflux to prevent chlorine gas from flowing back into the system! The starting point for your large reflux should be at the original chlorine distribution station at the outlet, or on the original chlorine pipeline before the distribution station. If it is at the distribution station, then check valves need to be installed on the pipelines leading to the users and to the liquid chlorine processing unit. If the return start point is on the original chlorine pipeline before the distribution station, you can add a check valve after the return start point and before the distribution station!
This post was last edited by nanren2 on 2018-3-3 at 14:45. The large reflux mechanism is usually interlocked with the chlorine compressor as well; that is, when all compressors stop, the interlock system shuts down the large reflux function! To prevent issues such as faulty check valves, excessive backflow pressure of chlorine gas that can cause damage to the tower equipment in the drying system, and abnormal pressure differences in the electrolyzers!