Method for reducing energy consumption of mother liquor evaporation processes

A technology of process energy consumption and mother liquor evaporation, applied in the chemical industry, sustainable manufacturing/processing, climate sustainability, etc., can solve the problems of pollution return rate, steam waste, etc., to increase production capacity, increase return rate, The effect of reducing process energy consumption

Active Publication Date: 2011-06-15
GUIZHOU BRANCH CHINA ALUMINUM IND
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, and to provide a method that can effectively overcome the waste of steam caused by the low vacuum degree of the mother liquor evaporation system in the alumina production process, the serious steaming of the condensed water, and the direct preheating of the solution. The method of reducing the energy consumption of the mother liquor evaporation process caused by the low water return rate caused by the untimely water change and the pollution of the condensed aqueous solution of various effects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] For the evaporator group in the alumina production process, a vacuum softening water pump is installed next to the softening water tank, the inlet is connected to the softening water tank, and the outlet is connected to the vacuum pump. A soft water pressure regulating valve is installed on the soft water inlet pipe of the vacuum pump. Corresponding regulating valve; the original pumping capacity Q=0-42m 3 / min The water ring vacuum pump with an absolute vacuum of 90-760 bar is upgraded to a pumping capacity Q greater than 50m 3 / min absolute vacuum degree is 100hPa water ring vacuum pump; the high-efficiency indirect preheater replaces the umbrella-type direct preheater to reduce the steam inlet process; a steam trap is installed on the condensate outlet pipe of the evaporator, and the outlet of the steam trap is connected to the high-efficiency The inlet of the condensate flash evaporator realizes steam blocking and drainage, which reduces the evaporation steam consum...

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Abstract

The invention provides a method for reducing energy consumption of mother liquor evaporation processes, which relates to an energy-saving method for mother liquor evaporation processes during alumina production. The method is characterized in that a process comprises the following steps: (1) adjusting the air exhaust quantity of a vacuum pump through a vacuum-pump soft-water booster pump, a soft water valve and a reflux valve so as to improve the vacuum degree of an evaporation system; (2) utilizing secondary steam produced by a condensed-water flash evaporator and a mother-liquor self-evaporator to preheat mother liquor with each effect through an indirect preheater; and (3) allowing condensed water to enter the condensed-water flash evaporator through a steam trap and then enter a backwater tank through an automatic condensed-water monitoring-redirecting device. The method has the advantages of increasing the machine-hour capacity of evaporators by 2 percent, reducing steam consumption by 10 percent and improving backwater rate by 8 percent.

Description

technical field [0001] The invention relates to a method for reducing energy consumption of a mother liquor evaporation process, relating to an energy-saving method used in the mother liquor evaporation process in the alumina production process. Background technique [0002] The energy consumption of the mother liquor evaporation process is an important part of the energy consumption of the alumina production process. The energy consumption of the process includes the consumption of fresh steam, the recovery and utilization of flashing steam, the recovery and utilization of condensed water, the consumption of electricity and the consumption of circulating water. [0003] In the current production process, the energy consumption of the mother liquor evaporation process mainly has the following problems: (1) By controlling the amount of circulating water to adjust the final effect vacuum degree, thereby reducing the final effect boiling point to improve the utilization effect o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
CPCY02P20/10
Inventor 蔡电峰邹若飞马让怀赵清法梁立强杜振林胡红霞
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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