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High levels of organic matter can hinder crystallization and affect the quality of crystallization. For water with high COD, it can be concentrated, but it is impossible to crystallize well when a viscous substance appears in the end. So, one is to determine whether it can crystallize through experiments, and the other is to record some conditions discovered during the crystallization process, such as foaming, boiling point, and crystallization. Only through these methods can we truly determine whether it is suitable for MVR and whether it can crystallize.
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First of all, it is necessary to judge how much salt content there is. The falling film and forced circulation system are designed according to the design volume, but the actual salt content in the in-fluent water is far less than the design value, and there must be no salt in the falling film. At this time, the water sample needs to be tested to determine the salt content value.
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Whether it can be discharged is uncertain,and it needs to be judged and analyzed,mainly depending on the content of cod and ammonia nitrogen.
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If it is evaporated by water, it should be possible, but it needs to look at the boiling point of copper carbonate. The normal boiling point should not exceed 12℃, and 10-12℃ is acceptable. The first factor of whether MVR is applicable is that the material is acceptable,that is, 2205, 316, and titanium can be used, without the need for more materials and without corrosion to the compressor; The second element is that the final boiling point of the material will not increase by more than 12 ℃, which can also be done at 12 ℃. However, the energy consumption of the compressor will be higher and the evaporation area will be larger.
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After the raw steam enters the plate heat exchanger and the material heat exchanger, it is discharged to the condensate water system or another water recovery system. The raw steam only preheats the incoming material to 90-85°C, and does not directly enter the system. If the simplicity of the system is considered, the raw steam can directly enter the heat exchanger system for heat exchange without directly preheating the material. The total heat of the two ways is balanced, all the same.
Reduce the amount of Ca2+ and Mg2+ entering as much as possible; wash with water and pickle (hydrochloric acid); add an appropriate amount of antiscalant to reduce the occurrence of scaling.
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The vacuum of the system is not caused by the vacuum pump. The vacuum of the system is caused by the condensation of the secondary steam. If the secondary steam cannot be condensed but is vacuumed by the vacuum pump, the system is not compatible.
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The price of steam is different, and the calculation efficiency is different. The maximum can reach 30, mainly depending on the price of steam.
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It is about 900,000-1.5 million, and the investment varies depending on the material of the heat exchanger and the compressor.
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MVR systems generally do not consider compressor backup because the compressor price is too expensive, accounting for about 35% of the MVR system price; If you want to use temporary steam backup, you need to consider pressure bearing issues. MVR belongs to negative pressure vessels, and pressure vessels are not allowed unless there is a pressure reducing valve that reduces to less than one kilogram. In this case, it is necessary to consider the design of the pressure vessel and the supporting condenser during the design process.
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If an accident occurs in the MVR, it will generally be shut down for a long time, especially for imported equipment. The accident pool (5-10 days stock) of the MVR should match the maintenance cycle of the MVR, and the seals of all pumps should be spare parts. Under normal circumstances, the problem of the compressor is not very serious, and it is generally overhauled once a year; if it is damaged under abnormal conditions, the maintenance time will be longer.
