Ultrapure Water Electrolysis For 1000LPH Oxygen and Hydrogen Gas Production
The two set of OH1000 oxyhydrogen generators are used to electrolyze with ultrapure water(18.25MΩ) and pure water to produce oxygen and hydrogen gas. The testing period is our machine’s maintenance and running time 500hours.
We analysis the state of electrolytic cell and its components after water electrolysis with ultrapure water and pure water. We are to confirm whether the 500 hours maintenance period can meet the cleaning requirement and check the durability of machine’s and components life.
1.Electrolytic Environment:0-40 celsius degree. The running station of two machines are stable.
The gas output is about 980L/h. The current fluctuates and voltage is a little high during cold start. The current is stable and the voltage drops down when the temperature is up to 40 celsius degree. The gas output is stable.
The electrolytic efficiency will be increased by the temperature of electrolytic cell in the process of gas production. The total power is about 3KW/h. There is no significant difference in the gas production.
3.The preparation of electrolyte liquid.
The concentration of electrolyte is 28%. The electrolyte liquid prepared with ultrapure water is transparent without precipitation. The electrolyte liquid prepared with pure water has precipitate.
4.Comparison of water quality in the process of water electrolysis.
Collect the samples of electrolyte liquid at different time. By collecting the electrolyte,we get the following conclusions as below:
No.1 There is impurity with pure water in the preparation of electrolyte liquid.
No.2 In the early stage of electrolysis, it can be found that there are more impurities in pure water than in ultrapure water.
No.3 In the middle of electrolysis, it can be found that the pure water is gray white and the impurity is plaster. Ultra pure water is light green and impurities are particles. This shows that ultra pure water is easier to precipitate.
No.4 It can be seen from the electrolyte collected at 500hours that the impurities in ultra pure water are less than those in pure water.
5.Comparison of water level sensor and water level protection pipe in electrolytic tank
After disassembling the water level sensor of the electrolyzer, it was found that the pure water level sensor was covered with dirt, and the surface of ultra pure water was clean and free of dirt. This phenomenon reflects the adsorption of impurities after pure water electrolysis, which is easy to cause sensor detection failure.
Moreover, it can be inferred that pure water electrolysis will block the collection port of the pressure sensor, which may lead to the failure of the pressure detection. It will block the protective pipe for water level detection, which may lead to water level detection failure.
6.Comparison of generator
The above pictures show that the impurities produced after electrolysis of pure water are adsorptive. If the generator is not cleaned effectively for a long time, the generator will be blocked and the dry burning of the electrolytic chamber will be damaged.
When testing about 200hours, one cooling fan has abnormal noise, which is fan fault. When testing about 420h, the equipment trips suddenly during operation, and it can be started normally after cooling for half an hour after tripping, which should be the power switch fault.
After oxyhydrogen generator OH1000 worked 500hours, all the parameters are stable. The power supply runs steady and some accessories have faults.
In the water electrolysis testing with ultra pure water, OH1000 machine should do maintain once every 500 hours running, which can extend the service life of the electrolytic cell. It is found that the ultra pure water for water electrolysis can avoid scaling electrolytic cell and reduce the failure rate of equipment.
In the later stage of water flushing the electrolytic cell, it is found that the ultra pure water can precipitate the impurities from the internal electrolytic metal on the bottom of the electrolytic tank, which is convenient for cleaning. However, the impurities in the pure water contain dirt, which will be adsorbed on the plate and the inside of the electrolytic cell. It is difficult to eliminate them in daily maintenance. Therefore, the service life of the electrolytic cell will be shortened and the failure rate of the equipment will be increased.
Through this test, it is found that it is feasible to set 500 hours for maintenance. It also shows that ultra pure water is more suitable than ordinary pure water for water electrolysis of hydrogen and oxygen.
This is the comparison of electric plate. According to the diagram, the aging of electrode plate with pure water electrolysis will be faster than that of ultra pure water. But there is no advantage of between ultra pure water and ordinary pure water from the aspect of internal dirty. Therefore, we don’t make conclusion but a reference.