Multi-effect evaporation concentration device and process for sulfuric acid and its salt solution

A multi-effect evaporation and concentration device technology, which is used in heating water/sewage treatment, water treatment parameter control, water/sludge/sewage treatment, etc. to improve economic efficiency, reduce production costs, and reduce evaporation costs.

Active Publication Date: 2018-01-02
许戈红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Really realize energy saving, emission reduction and efficiency increase

Method used

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  • Multi-effect evaporation concentration device and process for sulfuric acid and its salt solution
  • Multi-effect evaporation concentration device and process for sulfuric acid and its salt solution
  • Multi-effect evaporation concentration device and process for sulfuric acid and its salt solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Such as figure 1 As shown, the six-effect evaporator is provided with a five-stage preheater 9 , a four-stage preheater 10 , a three-stage preheater 11 , a secondary preheater 12 and a primary preheater 13 .

[0056] The acid feeding process of the acid bath C is as follows: the acid bath C is divided into 6 branches, and flows into the first-effect evaporator 1, the second-effect evaporator 2, the third-effect evaporator 3, the four-effect evaporator 4, the five-effect evaporator 5, Six-effect evaporator 6: The acid bath C without preheating by the preheater is divided into four paths and enters the three-effect evaporator 3, the four-effect evaporator 4, the five-effect evaporator 5, and the six-effect evaporator 6; the rest of the acid bath C enters the fifth-stage preheater 9, and uses the condensed water discharged from the fourth-stage preheater 10 and the heated steam condensed water of the five-effect evaporator 5 as heat sources; then enters the fourth-stage pr...

Embodiment 2

[0064] Such as figure 2 As shown, the acid bath five-effect evaporation crystallization is basically the same as the above-mentioned process of embodiment 1, and the flow process of a preheater is missing. The first three effects are evaporators, and the last two effects are four-effect evaporation crystallizer 4' and five-effect Evaporation crystallizer 5'.

[0065] The five-effect evaporating crystallizer 5' does not feed acid, which is for more evaporation and crystallization of sodium sulfate, and the four-effect evaporation crystallizer 4' may not feed or less acid, in order to adjust the amount of crystallization of sodium sulfate; the four-effect evaporation crystallization The 4' of the device is more acid, which can reduce the crystallization of Yuanmingfen. On the contrary, the output can be increased.

[0066] The steam-water ratio of the five-effect evaporation crystallization in the acid bath of the present invention reaches 0.237; the steam-water ratio reaches...

Embodiment 3

[0068] Such as image 3 As shown, the eight-effect evaporation of acidic water, the water intake process of acidic water or two-bath water is designed according to the characteristics of high water temperature and can reach the boiling point of water intake, and the acidic water enters the first five-effect evaporator through five branches: One-effect heating steam condensate water preheating first-effect evaporator 1 water inlet; second-effect heating steam condensate water preheating second-effect evaporator 2 water inlet; three-effect heating steam condensate water preheating three-effect evaporator 3 inlet water; four-effect Heating steam condensed water to preheat four-effect evaporator 4 inlet water; fifth-effect inlet water can reach boiling point inlet water without preheating; sixth-effect, seventh-effect, and eight-effect only accept the parallel flow drainage of the previous effect, not separate water inlet. The design of the water intake is based on the heat that c...

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Abstract

The invention discloses a multi-effect evaporation and concentration device and a technology thereof for solution containing sulfuric acid and salts thereof, and specifically provides a apparatus and a method for the processes of horizontal flow acid inlet, focusing preheating, cocurrent flow acid discharge and final effect crystallization (optional), which are designed for acid bath, two-bath and acidic water. The apparatus and method are used for evaporation concentration of acid bath, two-bath and acidic water or evaporation crystallization of sodium sulfate. The method controls the horizontal flow acid inlet amount of the previous effect evaporators, and is combined with the utilization of condensate water waste for focusing preheating, so as to reach the purposes of reducing temperature rise heat of the previous effect acid inlets, increase the vaporization heat, and dramatically reduces evaporation vapor and water ratio. The invention has the advantages of significantly reducing energy consumption and costs of evaporation, resolving discharge of solution containing sulfuric acid and salts thereof, directly evaporating and crystallizing anhydrous sodium sulphate, and solving emission of sodium sulfate. The invention improves the economic efficiency of enterprises, and far exceeds the most advanced level in the industry.

Description

technical field [0001] The invention relates to the evaporation recovery treatment of sulfuric acid and its salt solution in the production of chemical fibers, specifically a multi-effect evaporation concentration device and process for sulfuric acid and its salt solution, that is, for acid bath, secondary bath and acidic water recovery treatment, the acid bath is a spinning bath with a high concentration of sulfuric acid and its salt solution at a temperature of 45°C-55°C, and the second bath and the acidic water are sulfuric acid at a temperature of 70°C-95°C and Spinning process water with lower salt solution concentration and lower concentration. Background technique [0002] Spinning, coagulation, and washing processes in the viscose fiber production process are the main processes of fiber formation. The process of fiber coagulation into silk and silk washing produces sulfuric acid and its salt solution, mainly including acid bath, secondary bath and acidic water. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/04
CPCC02F1/04C02F2209/40
Inventor 许达人
Owner 许戈红
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