Corn raw material from the storage section goes to the crush section by the belt conveyor and bucket elevator. After removing the impurities, it is sent to the hammer mill grinding. After grinding, the cornflour is sent to the middle tank to provide the raw material for the liquefaction through the screw conveyor. This is the first step in alcohol production line.
The cornflour coming from the middle tank is sent to the mixing conveyor after the belt scale. Add the water, high temp. liquefaction enzyme, then to the 1st liquefaction tank. Under the effect of hot water, the cornflour adopts water for swelling. Its structure swells to the loose network structure from a similar crystal state. The first liquefaction tank is used for swelling, enzyme digestion, and viscosity reduction. After sand removing in alcohol production line, part of the mass is returned to the 1st liquefaction tank. Part is sent to the jet cooker.
When the material is sent to the maintenance tube in ethanol production equipment, the material stays for a certain time. The function is to strengthen the liquefaction effect. The material is cooled by flashing. The cooled mash enters the next liquefaction tank from the bottom further liquefaction in ethanol production equipment. Then, the mash is sent to the acid adjusting tank from the top for liquefied enzyme inactivation, then to the heat exchanger to cool to 60℃ for the saccharification. After that and heat exchange, the temp is reduced to the fermentation section.
The mature fermented mash and saccharified mash are pumped separately and enter the fermenting tank at the same time which has been cleaned in advance and cooled after sterilization. The process of adding mash should be controlled during the flourishing period of yeast proliferation in alcohol production equipment, and the process of loading mash should be controlled well to ensure that the mash concentration is within the specified range. The whole fermentation process should be controlled in accordance with the provisions of fermentation temperature, do a good job in the recovery of CO2 and light wine. The road of entering the mash pipe and the fermenter should be washed and sterilized strictly in accordance with the regulations to ensure normal fermentation in alcohol production equipment. After fermentation, the mature mash is pumped into the intermediate tank.
The mature mash coming from the fermentation section enters the tray at the top of the crude distillation tower after a heating exchange with the wine gas discharged at the top of the crude distillation tower. Mature mash in the crude distillation tower goes through the plate and mass transfers heat exchange with the rising wine gas in the tower at the same time. Almost all the ethanol of the mature mash change into wine gas. Vinasse from the bottom of the crude distillation tower almost does not contain ethanol, then to the centrifugal separation section of the DDGS workshop. After heat exchanging by wine gas and mature mash, the condensate enters the crude vinasse tank. The condensate enters the crude ethanol tank. The needed energy of the crude distillation tower is provided by the reboiler of the primary distillation tower. After removing some impurities in the purification tower, it enters the rectifying tower for concentration to remove the impurities continuously. The superior ethanol after the methanol removal tower enters the superior ethanol tank in ethanol production machine.
The vinasse from the crude distillation tower bottom is sent to the decanter for centrifugal separation after sand removing, then to the evaporator in ethanol production machine. The concentrate is sent to the dryer. After cooling, it is sent to the feed product tank.
Alcohol production plant make the 2nd condensate after evaporation and tank washing water mixed in the mixing pool, then it is mixed with the digestive reflux liquid and added alkali into the acidizing regulating tank to adjust the PH value, then to the UASB unit for anaerobic fermentation. The pure biogas is got after separating by the gas-water separator, then store in the biogas storage tank. The anaerobic sludge obtained from UASB enters the sludge storage tank, and after adding flocculant, it is filtered by the filter press to obtain dry sludge effluent. One part of the digestion fluid obtained from the UASB unit goes back into the acidizing regulating pool, the other part goes into the air flotation unit, and the supernatant in the air flotation unit goes into the water collecting distribution pool, and then goes into the SBR reactor from the water collecting distribution pool, and then through the overflow well to discharge. The sludge from the lower part of the air flotation device and the aerobic sludge from the SBR device go into the sludge storage tank together.