I. Overview

Five towers and three effects is a new energy-saving technology launched on the basis of traditional five towers differential pressure distillation, mainly used for the production of premium grade alcohol. The main equipment of traditional five-column differential pressure distillation includes crude distillation tower, dilution tower, rectification tower, methanol tower, and impurity tower. The heating method is that the rectification tower and the dilution tower are heated by the primary steam through the reboiler, and the wine vapor of the rectification tower supplies heat to the crude distillation tower through the reboiler. The wine vapor of the dilution tower supplies heat to the methanol tower through the reboiler. The impurity tower uses primary steam for direct heating, which consumes a lot of steam. The main equipment for five-column three-effect differential pressure distillation is also a crude distillation tower, a dilution tower, a rectification tower, a methanol tower, and an impurity tower.

2. Process characteristics

1. Adopt a three-effect thermal coupling process in which the refined tower heats the dilution tower, the methanol removal tower, and the impurity tower, and then the dilution tower and the methanol removal tower heat the crude distillation tower to minimize steam consumption. It consumes 2.2 tons of premium alcohol vapor to produce one ton.

2. The upper part of the crude distillation tower is equipped with a degassing section and a separator to reduce the solids and other impurities contained in the crude alcohol entering the rectification system and improve the purity of the crude alcohol.

3. The reboiler of the crude distillation tower adopts the patented thermosyphon circulation heating technology to replace the forced circulation heating method, which has a significant power saving effect and eliminates the clogging of the reboiler heat exchange tube.

4. Copper Pall ring filler is added to the distillation system to improve the taste quality of the finished alcohol.

Three, heating method

The key to energy saving of this process lies in its heating method. The primary steam passes through the reboiler to heat the distillation tower. The wine vapor of the rectification tower supplies heat to the methanol tower and the dilution tower through the methanol tower reboiler and the dilution tower reboiler, respectively. The diluting tower and the methanol tower wine vapors pass through the rough distillation tower reboiler A and B to heat the rough distillation tower respectively. Distillation tower wastewater flash steam heating impurity tower. One tower enters steam and five towers work, so as to realize three-effect thermal coupling and achieve energy-saving purposes. It consumes 2.2 tons of premium alcohol vapor to produce one ton.

Fourth, the material trend

The fermentation mature mash is fed from the top of the crude distillation column after two-stage preheating. The wine vapor at the top of the crude distillation tower is condensed and then enters the dilution tower for dilution and purification. The crude alcohol is diluted to 12-18% (v/v). Take out the alcohol (96% (v/v)) into the methanol removal tower, after further removing methanol and other impurities, take out the finished alcohol from the bottom.

Five, other advantages

1. In terms of power saving, the thermosiphon reboiler circulation heating method replaces the forced circulation heating method, and our patented technology avoids the clogging of the reboiler heat exchange tube. The electricity consumption per ton of alcohol is 20kwh, which saves 50% of the electricity compared to the 40-45kwh differential pressure distillation of the first five towers, avoids the maintenance of the reboiler forced circulation pump, and extends the service life of the reboiler.

2. Impurity wine processing: impurity alcohol from crude distillation tower, dilution tower, methanol tower, etc. and light wine from fusel oil separator enter the impurity tower, and extract industrial alcohol after the impurity tower condenser is discharged, the middle and lower parts The fusel oil is extracted, and the crude alcohol taken from the upper side line enters the dilution tower to increase the yield of super premium alcohol.

3. In terms of improving the quality of alcohol, in addition to technological measures, the equipment structure has also been improved. The crude distillation tower is equipped with a crude wine purification device, and the rectification tower is equipped with a copper filler desulfurization device to ensure the purity and taste of the alcohol.

6. Contrast table of energy consumption and quality of premium grade alcohol