Alkali temperature at outlet of tank

The tank temperature is determined based on the load; at full load, it does not exceed 87 degrees. When the load is low, the tank temperature is kept lower as well, and efforts should not be made to raise it intentionally.

Hello, may I ask? If the ion exchange membrane has been in use for over 3 years and experiences significant side reactions, with the temperature always remaining above 88.5 degrees even under full load, can the cell temperature still be adjusted according to the load level when reducing the current? There are 8 tanks, with new membranes installed; the temperature difference between several of these tanks is quite large.

In a system, control is carried out based on the highest tank temperature; lower tank temperatures can be addressed by heating the alkali fed into the tanks.

In chlorine engineering systems, the temperature of the liquid leaving the tank is monitored; the main way to control this exit temperature is by regulating the temperature of the liquid entering the tank. For example, if the desired exit temperature is 87 degrees Celsius, the entry temperature might be set at 92 degrees Celsius. In the Ineos system, the saltwater and alkali entering the cell have the same flow rate and temperature. The principle behind this system is to maintain a relationship between the reaction temperature inside the cell and the current applied. Therefore, when operating at full capacity, the temperature exiting the cell is 87 degrees Celsius, while the temperature of the material entering the cell is kept around 80 degrees Celsius. Due to the thermal effect of the current, the internal reaction temperature remains around 87 degrees Celsius. If the electrical density is low, such as 2 kA/m2, the temperature in the tank will rise to 87 degrees Celsius in order to maintain the reaction temperature within the tank. This is related to different system designs.

Our eight tanks share one heat exchanger.

I think for this issue, you need to control the temperature of the alkali leaving the tank based on the requirements of the ion exchange membrane! In particular, Asahi Glass films and DuPont films each have a relatively optimal operating temperature for a specific current density, while Asahi Kasei films have a wider range of temperature tolerances and are more adaptable. If your system does not control the slot temperature individually for each slot, you can select the most suitable common control range based on the different membranes! The zero-pole distance of electrolyzers these days is generally kept between 80 and 87 degrees; low current corresponds to low temperature, while high current corresponds to high temperature!