MVR (Mechanical Vapor Recompression) evaporator and application of MVR evaporator in heat transfer system

Abstract

The invention relates to an MVR (Mechanical Vapor Recompression) evaporator and application. A circular pump inlet pipeline, a frequency conversion circulating pump, a leachate inlet and a circulatingpump outlet pipeline are sequentially arranged on a circular inlet / outlet pipeline; a steam throttling valve, a stream flowmeter, a steam thermometer and a steam pressure gauge are respectively arranged on a pipeline body of a steam pipeline; a secondary steam condensate water flow meter is arranged on a pipeline of a secondary steam condenser and a secondary steam condensate water collector; a concentrate thermometer is arranged at the middle part of an evaporator body; a liquid distributor is communicated with a pipeline body of the circular pump outlet pipeline; a secondary steam outlet iscommunicated with a secondary steam condensation pipeline; a drain valve is arranged at the lower part of the condensate water collector; a liquid outlet is communicated with the circular inlet / outlet pipeline. The MVR evaporator disclosed by the invention is provided with the frequency conversion circulating pump and the steam throttling valve, so that steam pressure can be flexibly adjusted andheated, and the flow of circulating liquid also can be adjusted; compared with other evaporation systems, the MVR evaporator has the advantages of few used equipment and simple and flexible operation.

Description

technical field [0001] The invention relates to a system suitable for heat transfer research of an MVR evaporator, which belongs to the technical field of environmental protection equipment. Background technique [0002] The treatment of leachate from urban waste landfills and incineration plants has always been a very difficult problem in the design, operation and management of landfills and incineration plants. The leachate mainly comes from precipitation and the embedded water of the garbage itself. Since many factors may affect the properties of the leachate during the flow of the liquid, including physical factors, chemical factors and biological factors, the properties of the leachate vary within a considerable range. Generally speaking, its pH value is between 4 and 9, COD is in the range of 2000 to 62000mg / L, BOD5 is from 600 to 45000mg / L, ammonia nitrogen content is usually 100 to 1000mg / L, heavy metal concentration and heavy metal in municipal sewage The concentr...

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Problems solved by technology

[0003] The traditional leachate treatment process is a "biochemical + membrane filtration" treatment process, which will produce high-concentration concentrates that are difficult to handle

The new treatment method of "MVR evaporation + condensate biochemical" for leachate is more environmentally friendly because there is no concentrated liquid, but the composition of landfill leachate is extremely complex, and the composition varies greatly with regions and seasons. Fully understanding the heat transfer characteristics of leachate will be difficult to ensure the efficient and long-lasting operation of the MVR evaporation system. Therefore, it is necessary to study the heat transfer characteristics of leachate during evaporation. It is very important to obtain key parameters in the evaporation process, and then a Applicable Research Method for Heat Transfer Characteristics of MVR Evaporator

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