One question per week; answers win prizes. Question 8 from Chlor-alkali Chemistry (Basic Chemical Engineering Knowledge)
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This post was last edited by sunjl1981 on 2013-1-6 at 23:28. Let’s discuss any technical improvements that have been made to your own brine, electrolysis, or chlor-alkali processes. Answer directly and I will give you extra points. ， ， -
All water recovered from the resin column regeneration is reused in the primary brine
Let me explain: there has been a minor modification to the company’s vacuum dechlorination process. The pipeline used for cooling chlorine water in tank D319 is supposed, according to the design drawings provided by the design institute, to enter from the bottom of the tank. However, in cold winter temperatures, chlorine water tends to crystallize; this leads to an incorrect liquid level reading, which in turn causes abnormalities in the vacuum level and results in a decrease in the purity of chlorine gas. By having the pipeline enter after passing through a U-shaped bend, better results are achieved, and safety hazards are eliminated.
Improvements to the brackish water treatment process: The saltwater pipes in the first and second stages were originally made of titanium, which was prone to intergranular corrosion; these pipes were later replaced with those lined with glass. For nitrogen removal using membrane technology, it was necessary to meet the manufacturer’s requirements regarding parameters such as free chlorine, suspended solids, sulfate ions, and pH level in the brackish water coming from electrolysis. Therefore, fiberglass storage tanks were used to treat the saltwater before it was fed into the membrane nitrogen removal system； Variable frequency drive for liquid chlorine submersible pump
Electrolysis section: The forced-current electrolyzers have been converted to membrane electrode distance electrolyzers to increase production capacity and reduce power consumption. A brackish water chlorate decomposition system to reduce chlorate levels. Chlorine treatment: A chlorine gas check valve and UPS power supply are installed after the turbine to prevent damage to the unit in case of a sudden power outage.
Our chlorine pressure pump does not have minor backflow as shown in the diagram; after research, this was addressed, resulting in an improvement in pressure stability from the chlorine pressure pump to the pump. A D-260 and NaCl concentration analyzer is used to measure the concentration of brackish water
The diameter of the acid overflow pipeline between the chlorination-treated dryers was designed to be too small, resulting in difficulty in overflow; the issue was resolved by enlarging the pipeline. The pure water for the electrolysis and hydrochloric acid synthesis units is supplied through a pipeline network; changes in demand can affect production. To ensure a stable supply and maintain operations in cases of tight pure water availability or short-term interruptions, additional pure water intermediate tanks were installed.
Electrolysis section: The forced-current electrolyzers have been converted to membrane electrode distance electrolyzers to increase production capacity and reduce power consumption. A brackish water chlorate decomposition system to reduce chlorate levels. Chlorine treatment: A chlorine gas check valve and UPS power supply are installed after the turbine to prevent damage to the unit in case of a sudden power outage.
This post was last edited by Zhong Hengming on 2010-8-12 at 22:38. In Phase 5, the EV1101 screen made of 316L steel was replaced with a Ni screen; alkali evaporation and alkali condensate recovery systems were implemented. An increase in pressure at the chlorine-hydrogen gas outlet of the forced circulation tank was observed. In Phases 4 and 5, covers were added to prevent salt gases from entering. The sludge pump was replaced with a slurry pump. The accident towers of the old and new systems were connected to those in Phases 4 and 5. Protective measures were added to the conductive bars in the electrolytic cells, as coming into contact with them during maintenance could result in serious electrical shocks. The old synthesis furnace was converted into a furnace that produces steam as a by-product. Please share your suggestions~~~