Plate type preheater for acid bath, flash evaporation device of plate type preheater for acid bath and 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 smooth flow channel, expansion of heat transfer area, and improvement of plate utilization rate

Active Publication Date: 2015-04-08
许戈红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the above-mentioned problems that the gaps on both sides of the plates of the plate preheater are easy to be blocked, the precipitation of sulfides reduces the heat transfer coefficient, the f

Method used

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  • Plate type preheater for acid bath, flash evaporation device of plate type preheater for acid bath and alkaline cleaning process
  • Plate type preheater for acid bath, flash evaporation device of plate type preheater for acid bath and alkaline cleaning process

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Experimental program
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Effect test

Embodiment 1

[0073] Such as figure 1 As shown, a plate preheater for an acid bath includes a preheater plate assembly 1, a preheater upper cover 2, and a preheater shell 3; the preheater plate assembly 1 is a plate After being arranged and assembled, the assembly is fixed or welded with screws; the top of the preheater upper cover 2 is provided with a preheater steam inlet 4, and the preheater steam inlet 4 is connected to the preheater steam inlet pipe 5, and the preheater steam The inlet pipe 5 is provided with an alkaline water overflow port 6; the preheater shell 3 is provided with a preheater acid bath inlet 7, a preheater acid bath outlet 8, a flash condensate inlet 9, and a preheater Condensed water outlet 10 and non-condensable gas outlet 11; the steam inlet 4 of the preheater is arranged above the plate gap on the steam side of the plate assembly 1, and the condensed water outlet 10 of the preheater is arranged on the side of the plate assembly 1 Below the gap on the steam side; ...

Embodiment 2

[0075] Such as figure 2 As shown, an acid bath plate preheater flash device, including heater H, preheater A 1 to preheater A 9 and flasher V 1 to flasher V 11 , Condenser MK 1 , Condenser MK 2 , Vacuum pump ZB, circulation pump XB, alkali water tank JC, alkali water pump JB. The preheater A 1 to preheater A 9 Both are equipped with preheater acid bath inlet 7 and preheater acid bath outlet 8, and are connected to corresponding pipe sections; the heater H is provided with H acid bath inlet 13, H acid bath outlet 14 and H condensate outlet 15. The non-condensable gas port 16 of H row, the preheater steam inlet 4 of each stage of preheater are respectively connected with the preheater steam outlet of flash steam of the same level, and the flash evaporator V 10 and flasher V 11 The steam outlets are respectively connected with the condenser MK 2 and condenser MK 1 The steam inlet is connected, the condenser MK 1 and condenser MK 2 They are respectively connected to ...

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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.

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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Application Information

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IPC IPC(8): D01D5/06D01D13/02D01F13/02
CPCY02P70/62
Inventor 许达人
Owner 许戈红
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