With the continuous development of industrial technology, all walks of life have put forward more stringent requirements for the efficiency of energy and resource utilization. In the chemical industry, MVR concentration technology has been favored by more and more enterprises because of its energy-saving and high-efficiency characteristics. Foam problems often occur in the MVR concentration process, which seriously affects the normal operation of the equipment and improves the efficiency of product concentration. In order to solve the problem of foam in MVR concentration, many companies are actively exploring various solutions to eliminate foam.
MVR concentration technology is to recompress and heat low-temperature and low-pressure steam through a vapor compression cycle to make it into high-temperature and high-pressure steam, which is then used to heat the concentrator so that the solution in the concentrator can be evaporated. In this process, the volatile substances in the solution are brought to the top of the concentrator, forming bubbles, which cause the foam to be generated.
The formation of foam causes the gas-liquid two phases in the concentrator to mix violently, which affects the heat transfer efficiency of the concentrator, resulting in an increase in energy consumption of the equipment and a decrease in production efficiency. How to effectively eliminate the foam in the MVR concentration process has become an urgent problem for many enterprises.
The key to solving the foam problem in MVR concentration lies in the use of appropriate defoamers and reasonable defoaming schemes. At present, the main defoamers on the market are silicone defoamers, phenolic resin defoamers and fluorocarbon surfactant defoamers. Through their surface activity, these defoamers can effectively destroy the surface tension of bubbles, so that the bubbles can burst quickly and release gases, so as to achieve the effect of defoaming.
In addition to selecting the appropriate defoamer, it is also necessary to formulate the defoaming plan in combination with the specific process conditions and the characteristics of the concentration equipment. The general defoaming plan includes the selection of defoamer, the determination of the addition point and the control of the amount of defoamer.
The selection of defoamer should be comprehensively considered according to the properties of the solution, temperature, concentration and other factors. For example, silicone defoamers may be an option for some concentrated solutions that contain large amounts of protein or oilFor some solutions with higher pH, phenolic resin defoamer is suitable. When it comes to the point of addition of the defoamer, the top or sidewall of the concentrator is generally chosen to allow the defoamer to be mixed into the solution as quickly as possible for maximum defoaming. The dosage of defoamer is also particularly critical, too little can not achieve the effect of defoaming, and too much may affect the quality of the product, so strict control is required.
In addition to defoamer selection and dosage control, there are a number of other measures that can be effective in helping to eliminate foam in MVR concentrates. For example, by optimizing the structural design of the concentrator, adding a gas-liquid separator, increasing the flow rate of the solution, etc., the residence time and aggregation of bubbles in the concentrator can be reduced, thereby reducing the formation of foam. Reasonable design of the inlet and outlet structure of the concentrator, and strengthening the stirring and shaking of the solution can also effectively help defoaming.
In practical application, the elimination of foam in MVR concentration is not only a simple selection of a defoamer or a defoaming scheme, but also a combination of specific process conditions and equipment characteristics to adjust and optimize the defoamer and defoaming scheme. Different manufacturers can also customize defoaming solutions according to the actual situation and provide customized solutions to better meet the needs of customers.
The popularization and application of the total MVR concentration technology provides a higher level of energy-saving and emission reduction technical solutions for all walks of life. Solving the foam problem in MVR concentration is an urgent need to achieve comprehensive improvement of technology and promote industrial development. Only by continuously exploring, improving and applying advanced defoaming technologies and solutions can we better give full play to the advantages of MVR concentration technology and promote the more sustainable development of the chemical industry.