- Knowel's type electrolytic cells
- Hydrogen Generator Model G 16/d
We make use of electrolytic cells of Knowel's type to produce hydrogen gas. The process that we follow are as follows:
- Tanks and bells are welded by electrodes of special quality.
They are capable to avoid the process embrittling between caustic
soda and hydrogen.
- Using C.R.C. sheets, bells are manufactured which are suitable
for caustic soda handling.
- We also use the asbestos diaphragm cloth. This is made out of
100% pure long fiber asbestos, which is free of cellulose core and
closely woven to avoid pin holes.
- To guard against bye-pass of gases, extra length of cloth is
provided at the bottom .
- Ebonite insulators are tested. These are tested against warping
under high temperature. They are also checked for infinity
- Nickeling of anodes is also done. We do it under strict supervision for a minimum of 0.002 thick coarse deposit. We test each plate chemically for pores.
The performance and long life of the electrolyser. Ofcourse, this depends on the quality of feed water. It is to be noted that only oxygen and hydrogen together with some water vapor escape from the electrolyser. As a result, each impurity that is produced with the feed water will accumulate in electrolyte, composed of sulphate, chloride, and iron. Sulphate and chloride have harmful effect on nickel metal. This produces heavy corrosion. Iron will cause impure oxygen gas. We make sure that at the end the hydrogen gas that is produced at the end is free of such impurities and moisture.
Electrolysis: The process
The electrolysis process is used to produce hydrogen and oxygen. When we talk about electrolysis of water, it implies the decomposition of water (H2O) into hydrogen gas (H2) and oxygen (O2) gas and this is done by using an electric current which passes through the water. This electrolytic process is used in many industrial applications when hydrogen is needed. In our plants also, we make use of this process.
An electrical power source is connected to two electrodes which are placed in the water. Hydrogen will appear at the cathode, which is the negatively charged electrode, where electrons are pumped into the water. On the other hand, oxygen will appear at the anode, which is the positively charged electrode. The generated amount of hydrogen is twice the amount of oxygen. Both oxygen and nitrogen are proportional to the total electrical charge that passes through the water. In the entire process, the electrochemical reaction that follows is.
2H2O = 2H2 + O2
Hydrogen and oxygen, thus produced, are stored in proper circuits and tanks separately. We also provide our own storage tankers. The generator automatically delivers the required gas quantities to the end user.
Production pressure of both hydrogen and oxygen is > 4 bar, which is kept constant by an electronic control equipment.
Hydrogen generator model G 16/d: Plant Description
Generator G 16/d is composed by electrolitic cells. These have support slide and fixing belts in inox steel. All connections and pipelines are in inox steel. The hydrogen generator is composed of the following which works to produce the gas:
- A structural tank: This is in the lower level. Made of
inox steel, it is there to restraining all liquids present in the
generator in case of accidental leak.
- A skid: This is made of carbonium steel. It is painted and fixed to the "structural tank".
- Shell: This is made of four different compartments:
- Electrical and electronics parts
- Electro pneumatics devices
- Internal tanks: These are also made of inox steel. It
functions as bi. phasic separators. There are condensators with air
and liquid exchangers.
- All the necessary devices: Required for gases treatment
- Pipelines and threaded connections
- Internal exchangers These are required for coolings
gases which passes out from separators groups.
- Process off-gas discharges device: Here, oxygen and hydrogen, will have an external discharge from the cabinet by a proper pipeline.
|Hydrogen purity||> 99, 999%|
|Oxygen Purity||> 98,5%|
|Produced gas pressure||4 bar (r)|
|Purity of gases (Knowel's Cell)||Hydrogen=99.8+ 2 by Vol.
Oxygen =99.5+ 0.5 by Vol.
|Gas pressure (Knowel's Cell)||Max. 250 mm of water column. This is sufficient for storage in low pressure gas holders. When oxygen is not required to be stored, it is vented out to atmosphere through pressure balancing tank.|
|Air pollution||(in filter press type) : NIL (in Knowel type) Minor leakage of gases. They cannot be detected. They cause caustic atmosphere in the cell room.|
|Fire hazards||(in filter press type) : NIL Knowel type