Vertical double-tube-pass circulation fluidized bed evaporator with separation plate

Abstract

The invention belongs to the technical field of evaporators, and discloses a vertical double-tube-pass circulation fluidized bed evaporator with a separation plate. The evaporator comprises a heatingchamber and an evaporation chamber, wherein the heating chamber comprises an ascending bed and a descending bed; the separation plate is arranged in the evaporation chamber; a mixed work medium prepared from solid particles and liquid phase work medium of pure water is added into the heating chamber and the evaporation chamber for forced circulation; a solid particle distribution plate is arrangedat the upper part of the separation plate; the solid particle distribution plate comprises a side plate fixedly connected to the separation plate and a main plate vertically connected onto the top ofthe side plate; the main plate is horizontally installed and is positioned above the descending bed; the main plate is provided with a plurality of rows of round holes which gradually become bigger from inside to outside and are used as solid particle passage openings. The evaporator has the advantages that the structure is simple; the processing is convenient; the online scale prevention and scale removal and reinforced heat transfer can be realized. The particle distribution device can effectively improve the particle distribution condition of the descending bed; solid particles can be uniformly distributed into a tube bundle of the descending bed; the heat transfer, scale prevention and scale removal effects can be further and favorably improved and reinforced.

Description

technical field [0001] The invention belongs to the technical field of evaporators, in particular, it is a heat transfer enhancement and anti-scaling and descaling technology applied to a vertical double-tube-pass circulation type evaporator with partitions. Background technique [0002] The vertical double-pipe-pass circulating evaporator with partitions is widely used in industrial production such as soda sulfide. With the prolongation of the operation time, the suspended matter or crystallized matter in the material is enriched on the wall of the tube bundle, forming fouling. The generation of dirt will reduce the heat transfer coefficient and heat transfer rate in the heat exchange tube, and the heat exchange equipment needs to be shut down for cleaning regularly, resulting in a serious decline in production capacity. At present, the anti-scaling and descaling methods used in this type of evaporator mainly include physical methods and chemical methods, such as: using hi...

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Problems solved by technology

[0003] The present invention aims to solve the technical problems of the heat transfer performance decline and wall fouling of the vertical double-tube-pass circulating evaporator with partitions in long-term use, and provides a vertical double-tube-pass circulating flow with partitions. The fluidized bed evaporator applies the fluidized bed heat exchange anti-scaling and energy-saving technology to the vertical double-pipe circulation evaporator. For the problem of uneven particle distribution in the descending bed, the uniformity of particle distribution can be improved by setting a solid particle distribution plate, so as to achieve good online enhanced heat transfer and anti-scaling effects.

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