MVR is the abbreviation for Mechanical Vapor Recompression technology which is a new technology developed internationally by North America and Europe in the 1990s. The MVR technology is as follows: the secondary vapor generated by the evaporation of the liquid material is compressed by the steam compressor to increase the temperature and pressure, and causing the heat enthalpy to increase, and the vapor then enters the shell side of the evaporator to heat the liquid material on the heated side. After obtaining heat, the liquid material boils and vaporizes to produce secondary vapor, which enters the steam compressor again and is compressed and heated, thus achieving the cyclic utilization of the secondary vapor.The basic ieda is to recycle and utilize the latent heat of the secondary vapor, so as to achieve the substitution of electrical energy for steam consumption generated by coal burning.
MVR evaporation technology is widely used in many fields such as energy saving (concentration and crystallization of solution) and environmental protection (industrial wastewater treatment). MVR technology is more and more concerned and adopted by enterprises due to its high efficiency, low operating cost, reliable performance, and compact structure. The power consumption per ton of water evaporated by the MVR system is 18-60 kWh (which varies with material characteristics and processing capacity), and there is no need to supplement steam during operation. This not only saves steam but also eliminates the need for a cooling water circulation system. Compared to traditional four-effect evaporators, it saves more than 60% energy and has a running cost of one-third that of the traditional four-effect evaporators, with great energy-saving and consumption reduction effect.
Features 1、Extremely low energy consumption, the power consumption to evaporate per ton of water is 25~50kw;
2、With small heating temperature difference, the evaporation is gentle and the product loss is small;
3、With a compact layout and low construction cost, the occupied area is more than 50% smaller than that of traditional evaporators;
4、Fully automatic workflow, easy to operate;
5、Environmentally friendly, smokeless and vapor free;
6、Low load operation with strong adaptability and high operational flexibility, long service life;
7、Low consumption of circulating cooling water and significant energy-saving effect
Performance comparisonIn the MVR evaporation system, the secondary vapor generated from the evaporator enters the steam compressor, where its temperature and pressure are increased before being re-introduced into the evaporator as the heating steam to complete the heat exchange with the material to be processed. The exchanged steam then condenses and is discharged along with the condensed water. From the energy cycling perspective, for the MVR evaporation system, all the secondary vapor is recycled within the evaporator itself, while for the multi-effect evaporation system, the secondary steam is utilized several times for thermal energy in the next evaporator, and then cooled by circulating cooling water, resulting in some heat energy loss. Therefore, the energy-saving effect of the MVR evaporation system is significant. For the MVR evaporation system, it replaces the consumption of a large amount of heating steam (coal consumption) by supplementing a certain amount of compression work (electricity consumption). From the perspective of energy utilization, the energy consumption of the MVR system is only 1/6 of that of a multi-effect (four-effect) operation. Considering operating costs, the price ratio of coal and electricity is the main factor determining the operating expenses of the MVR evaporation system.
