What is the current efficiency of Asahi Kasei’s new films generally?
Thread Content
This post was last edited by sunjl1981 on 2013-1-6 at 19:58. For Kyocera’s 200,000-ton facility, 40,000 tons are currently being processed (using 2 units); the current per unit is 12.15 KA (as specified), with a voltage of 458–463 V. I just tested it, but the current efficiency is quite low, ranging from 93 to 98. What’s going on here? I’m a newcomer; thank you all for your guidance! Thank you. This post was last edited by yzhms on 2009-3-26 14:19 ] # ， ， &
The current efficiency when the machine first starts operating is generally greater than 97%
If a plant with a capacity of 200,000 tons operates at 40,000 tons, what impact does that have on the plant or the process?
Currently, Asahi Kasei uses the F6801 grade of membrane in its domestic applications. The electrolyzer mentioned by the poster appears to have 142 electrolytic cells; given the high voltage, it’s possible that the temperature control is not optimal. It could also be an old electrolyzer after a batch of membranes has been replaced. Additionally, there is an issue with the current efficiency figure you provided – for new membranes, the guaranteed value is generally no less than 95%. Please check the calculation method and compare the results; the problem lies in these two aspects. Last edited by limingshuguang on 2009-3-27 09:06.]
Pay special attention to the measurement issues (related to the amount of alkali and current); these problems are usually caused by inaccurate measurements or large errors.
Generally, the current efficiency of new membranes ranges from 96% to 97%, and it has little relation to the actual production load.
They are all new devices; testing began just half a month ago. The voltage per cell is between 3.11 and 3.14, with 146 cells in each slot. The concentration of the base, however, is not very stable, with values ranging from 31.5 to 33.1 as analyzed. This post was last edited by limingshuguang on 2009-3-28 08:56.]
At least 95% is required; I’m talking about the average value~ Otherwise, it’s not worth it……
1. The production statistics are incorrect; it is more appropriate to conduct the calculations daily. 2. The concentration control is too imprecise; in addition to improving the analysis methods, pay attention to changes in the amount of water added to FI221. 3. The saltwater concentration varies too much; stabilize it.
Strengthen the control of concentration; the fluctuations in concentration are quite large. Stabilize the concentration of the saline solution, and pay attention to the amount of pure water added to the electrolyzer. When an Asahi Kasei electrolyzer is first put into operation, it is necessary to ensure a high current efficiency, of at least 96%. Identify potential issues from various aspects, such as metering errors related to current and alkali flow rates. The calculation period should be longer in order to obtain more accurate results that reflect the actual situation.
The efficiency when just driving should be around 97%. The tank temperature should not be too low; it is best to keep it above 85°C. The flow rate of brine entering the tank, indicated by FICA-231, and the flow rate of pure water, indicated by FIC-221, need to be controlled stably. With proper control of the brine concentration and pH value, high efficiency can be achieved. Check all the indicators carefully. This post was last edited by yzhms on 2009-3-28 11:32.]
Asahi Kasei’s design is likely quite good; I think you should first look for reasons within your own team and exercise strict control over all the data. Strict management is even more necessary when a new project starts, and the data analysis must be accurate. I’ve encountered many new projects where the on-site control parameters were poor and the data inaccurate. In my opinion, it’s essential to ensure accuracy in the following parameters: the saltwater level should remain stable, with a pH of around 10; the saltwater concentration should be 305; the tank temperature should be around 90 degrees. The levels of various cations should be kept low, not high. The amount of pure water added must also be precise, in accordance with the design specifications. Here’s some advice for you: observe more, exercise careful control, and set strict requirements for each control unit. By paying attention to the points mentioned above, such large fluctuations in current efficiency cannot occur. This post was last edited by yzhms on 2009-3-28 15:44]
The instability of alkali concentration is mainly caused by water migration; by controlling the concentration of saline solutions, fluctuations in the concentration entering the tank can be reduced.
The electrolysis efficiency is related to the following factors: 1. The concentration of the brine fed into the cell. 2. The temperature of the brine entering the tank. 3. Ion content in the saltwater entering the tank (especially calcium and magnesium). 4. Control of the concentration and flow rate of HCl entering the tank. 5. Control of the amount and concentration of the alkali solution fed into the tank. 6. Control of slot voltage. 7. The influence between cells of the electrolyzer. 8. Pressure difference between the liquid phases on the anode and cathode sides. 9. The pressure difference between the anode and cathode gas phases. 10. The properties of the ion exchange membrane itself. 11. Slot voltage. 12. Exchange rate (equivalents) of Na ions in the membrane carboxylic acid layer. The above are personal opinions; in fact, there are many other factors that affect the efficiency of ion membranes.