Method for measuring liquid level of fermentation tank

Abstract

The invention discloses a method for continuously measuring a liquid level of a fermentation tank. The method is implemented by measuring the average density correction factor k. By using the measurement method, the liquid level height of the fermentation tank and the liquid level variation rate of the fermentation tank can be monitored during the whole course, defoaming can be more scientifically carried out, i.e. a defoamer can be used more properly with less amount, thus no liquid escaping phenomenon is generated, the liquid surface can be in the highest safe height, and the advantages of improving fermentation unit, relieving subsequent extraction process load and providing and reducing energy consumption is obvious.

Description

technical field [0001] The invention belongs to the field of fermentation, and more specifically relates to a method for measuring the liquid level of an aerobic (ventilated) fermentation tank. [0002] Aerobic fermentations must have foam due to aeration. The scope of application of this technology is that the bubbles are evenly distributed into the fermentation liquid, excluding the occasions where the bubbles float on the surface of the liquid and have an obvious gas-liquid interface. Background technique [0003] The liquid level of the fermenter refers to the height of the fermentation liquid in the fermenter. In actual production, due to the change of oxygen supply and ventilation, various liquids are constantly replenished, especially the change (consumption and production) of the fermentation broth composition changes the surface tension of the liquid, and finally changes the gas / liquid volume ratio. As the gas / liquid volume ratio becomes larger, the liquid level i...

AI Technical Summary

Problems solved by technology

However, there must be foam in aerobic fermentation, and the bubbles in the fermentation liquid rise from the bottom of the fermenter to the top and continue to expand, that is, the gas / liquid volume ratio increases, and the liquid density decreases monotonously; at the same time, the aseptic production conditions in the fermentation process make The above conventional liquid level measurement methods have not been successfully applied to the fermentation process so far

[0006] At present, only the contact electrode method is used to measure the liquid level of fermentation tanks for defoaming in industry. It installs electrodes extending from the top of the tank, and waits for the liquid level to rise to contact the electrodes. This method has some disadvantages. Whether the use of foaming agent is timely and appropriate, and the liquid level cannot be controlled at a reasonable height

Therefore, it is prone to liquid escape, excessive antifoaming agent suppresses the growth of bacteria, and increases the negative factors such as difficulty in extraction and increased energy consumption in the subsequent process.