Plate preheater for acid bath, flash device for acid bath plate preheater and its alkaline cleaning process

A technology of preheater and acid bath, applied in the field of plate preheater for acid bath and plate preheater flash device for acid bath, can solve the problem of reducing heat transfer coefficient, rapid decay of flash performance, and easy gaps on both sides of the plate. Clogging and other problems, to achieve the effect of improving utilization, expanding heat transfer area, and smooth flow channels
CN104499067BActive Publication Date: 2017-01-18许戈红
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
许戈红
Publication Date
2017-01-18

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Abstract

The invention belongs to the field of chemical fiber production equipment and discloses a plate type preheater for acid bath, a flash evaporation device of the plate type preheater for acid bath and an alkaline cleaning process. The plate type preheater for acid bath comprises a preheater plate integration part, a preheater upper cover and a preheater shell, the preheater upper cover and the preheater shell are provided with a preheater steam inlet and a preheater condensate outlet, the preheater steam inlet is formed above a steam-side seam of the plate integration part, and the preheater condensate outlet is formed below the steam-side seam of the plate integration part. The flash evaporation device of the plate type preheater for acid bath takes the plate type preheater for acid bath as the preheater fittingly used with a quick alkaline cleaning process, the problems of insufficient circulation sectional area of low-pressure secondary steam, rapid decline of flash evaporation performance and the like caused by blockage of plate seams and sulfide scaling formation due to sulfide and colloidal particles when the plate preheater is used for acid bath preheating are solved, steam-water ratio of the flash evaporation device is smaller than 0.2, and about 40% of steam is saved as compared with that of a traditional flash evaporation device.
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Description

technical field

[0001] The invention relates to chemical fiber production equipment, in particular to a plate preheater for acid bath and a plate preheater flashing device for acid bath. Background technique

[0002] At present, the acid bath flash evaporation device of viscose fiber at home and abroad has used graphite heat exchanger as preheater for half a century, and the heat transfer coefficient is only 400-700kcal / m 2 h°C, resulting in a bulky preheater and high energy consumption. Using a plate heat exchanger as a preheater can greatly increase the heat transfer coefficient and reduce energy consumption. However, due to the precipitation of sulfide and acid mud during the preheating of the acid bath, scaling and deposition will occur on the heat transfer wall surface, while the gap between the heat transfer plates of the plate preheater is small and easy to block. The specific analysis is as follows:

[0003] 1. The sulfide is precipitated and thickened on the wall,...

Claims

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