The issue of electrolyzer cell temperature control

Typically, the cell temperature of our electrolyzers is controlled at 85 degrees Celsius plus or minus 3 degrees. If the tank temperature is too low, steam should be used to adjust it; naturally, the tank temperature will rise when the current is high. Be especially careful in winter!

The tank temperature of Asahi Kasei cannot be controlled at low current levels, as the catholyte system does not have a heating mechanism. This post was last edited by liuming31 on 2009-2-3 09:24]

It seems that the saline solution is not heated, and the cathode solution is not cooled. This is the process of Beihua Machinery.

By adding a third connection at the outlet of the alkali circulation tank and leading one end to a plate heat exchanger, steam is used for heat exchange; by adjusting the amount of steam applied, the temperature of the alkali entering the tank can be controlled. In Asahi Kasei’s high-current-density electrolyzers with a current of 12,000 A, the temperature is maintained around 90–85 degrees, as this results in the highest current efficiency without causing vaporization. As the current decreases, a temperature range of 80–70 degrees is sufficient; this temperature is appropriate for long-term operation at lower currents

Each ion exchange membrane has an optimal operating temperature range; within this range, an increase in temperature leads to an expansion of the pores on the cathode side of the membrane, which increases the transport coefficient of sodium ions and thus helps to improve current efficiency. At each current density, there is a temperature point at which the optimal current efficiency is achieved. When the current density decreases, in order to achieve the highest current efficiency, the operating temperature of the cell must also be reduced accordingly. However, when the groove temperature drops below 65°C, the current efficiency declines rapidly, and even if the temperature rises later on, it is difficult for the current efficiency to return to its original level. An increase in temperature will enlarge the pores of the membrane, which helps to improve its electrical conductivity; it also increases the conductivity of the electrolyte, thereby allowing the cell voltage to be reduced. For every 1°C increase in temperature, the cell voltage can decrease by 16 mV. However, when the temperature is too high, the evaporation rate of water increases, leading to an increase in the vapor/water ratio and thus a rise in voltage. At the same time, as the electrolyte approaches boiling point, this accelerates the degradation of the membrane, as well as increasing electrode corrosion and the passivation of the coating. Avoid operating at temperatures above >90°C. Furthermore, as the temperature rises, the NaCl content in caustic soda increases as well. This is mainly because rising temperatures cause the membrane to expand, and at the same time the activity coefficient of Cl- also increases, thereby accelerating the diffusion of Cl- into the cathode chamber. Generally speaking: the recommended temperature range is (85–88)°C [（4–5）kA/m2].

The tank temperature is generally kept around 85 degrees; a steam pipe can be added to the coolant for the catholyte, allowing it to be heated to the set temperature at low current densities.

What we have here are electrolyzers for chlorine production, and they have specific requirements regarding current and temperature! However, Asahi Kasei also has requirements; generally, for standards that meet 10.8kA or more, the temperature ranges from 85 to 89 degrees. As the temperature drops, the tank voltage increases. Of course, the current efficiency will also decrease!

Our company uses electrolyzers manufactured by Beihua Machinery, as well as ion exchange membranes from Asahi Kasei in Japan. Both the brine fed into the cell and the cathode solution are heated; the alkaline product obtained at the cathode is further cooled using plate heat exchangers in order to regulate the temperature of the cell. The operating temperature recommended by Asahi Kasei is between 85 and 90 degrees, with the optimal temperature being around 87–88 degrees. If the temperature is too low, the cell pressure increases; however, when it exceeds 90 degrees, the cell pressure rises further, which accelerates the degradation of the membrane and also intensifies the corrosion of the electrodes as well as the passivation of their coatings. An increase in cell temperature also leads to an increase in the salt content in the alkaline solution.

Our factory uses Beihua Machine electrolyzers and Asahi Kasei ion exchange membranes, with the cell temperature generally maintained between 87 and 88 degrees.

Adjust the temperature according to different needs~~~ Keep it generally between 75 and 90. Current 1100-1300 amperes~~

We use Asahi Kasei ion exchange membranes, and we control the temperature at 86 to 88 degrees based on experience. Heat with steam at the heat exchanger.

We use chlorine-based processes, with the temperature generally maintained between 88 and 90 degrees. If the temperature is too low, it causes the cell voltage to rise, increasing power consumption; if the temperature exceeds 90 degrees, the electrolyte boils, which affects the lifespan of the membrane.