System and method for automatic control of ethanol recovery

Abstract

The invention discloses an ethanol recovery automation controlling system and a method thereof. According to the invention, an outlet of an ethanol waste liquid pretreatment system is connected with an inlet of an ethanol recovery system, a flowmeter is arranged on a connecting pipeline, a pneumatic control valve is arranged on the connecting pipeline of a preheater and a distillation tower, an alcohol discharge port is arranged at the bottom of the ethanol distillation tower, a part of alcohol is introduced into a reboiler and then is back to the ethanol distillation tower, a part of alcohol is introduced into a gas-liquid separator through a pollution-discharge pneumatic valve, through gas-liquid separating, gas is back to the ethanol distillation tower, the liquid is discharged, steam from the ethanol distillation tower is introduced into the preheater for heat exchange, then is introduced into a condensation system for condensation, and the discharged qualified alcohol liquid passes through a finished product cooler for collection. The ethanol recovery automation controlling method is characterized in that waste ethanol crude crystal mother liquor is neutralized, then passes through a filter plate frame for filtering the sediment, and then is introduced into a recovery system for distillation recovery. According to the invention, the ethanol recovery automation controlling system and the method are optimized, energy consumption is saved, sewage discharge is reduced, and distillation yield is increased.

Description

technical field [0001] The invention belongs to the field of ethanol recovery and relates to an automatic control system and method for ethanol recovery. Background technique [0002] Working principle of ethanol recovery tower: Utilizing the principle that the boiling point of ethanol is lower than that of other solutions, the dilute ethanol solution to be recovered is heated and volatilized at a temperature slightly higher than the boiling point of ethanol. The concentration of ethanol solution can achieve the purpose of recovering ethanol. [0003] With the increase of energy cost and labor cost, and the increase of environmental protection pressure, energy saving and consumption reduction, reduction of staff and efficiency increase, improvement of product yield and reduction of production cost are the themes of technological innovation of every enterprise. Ethanol recovery is a production unit that consumes a lot of energy and discharges a lot of pollutants, so it is ne...

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that at least two stages of recovery towers are heated, the cost of equipment invested is high, and the energy consumption is large. At the same time, there is 2% ethanol in the waste liquid, and zero discharge is not achieved, and the recovery rate of ethanol is low.

[0005] CN201110379162.7 "Alcohol Automatic Recovery System" discloses an alcohol automatic recovery system that solves the problems that the existing ethanol recovery system relies on manual operation, high labor intensity, heavy workload, and long working cycle. Two waste ethanol storage tanks are arranged side by side, the outlet of each waste ethanol storage tank is connected with the preheater, the first feed pump and feed regulating valve are arranged on the connecting pipeline, the outlet of the preheater is connected with the waste ethanol inlet of the ethanol recovery tower connected; the bottom of the ethanol recovery tower is provided with a dilute ethanol discharge port, and a reboiler is connected in series between the dilute ethanol discharge port and the inlet, and the preheater is provided with a waste water discharge port; the top of the ethanol recovery tower is provided with an ethanol steam outlet, cooling water The first tower overhead condenser is connected in series in the circuit, part of the ethanol discharged from the condenser is returned to the ethanol recovery tower through the first reflux pump of the reflux tank, and the other part enters the finished ethanol storage tank through the finished product condenser of the cost-free ethanol regulating valve

The advantage of this invention is that it reduces the manual operation, and the disadvantage is that it does not solve the problems of large energy consumption and low distillation yield.

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