The Causes of Scaling in China's Grease Disc Centrifuge and Its Impact on Production Zhang Liwei1 Li Shilong\Chen Zhibin2 Duan Guocong3 Peng Xiaohua1 Li Bing1(1. Jiujiang Zhonghong Grease Co., Ltd., 332004, Binjiang East Road, Jiujiang City, Jiangxi Province, China; provincial Cereals, oils Research Institute, Guiyang 550003, China; 3 Beijing Jinwanli oil Co., Fengtai District, Beijing 100076; first author: Male, 35 years old, Master of influence) refining rate, and ultimately to find a solution to the centrifuge fouling .

6: With the advancement of technology and the improvement of people's living standards, the market demand for salad oil and high-grade cooking oil is expanding. The production scale of oil refinery manufacturers is also increasing, and the refining process of oil is becoming increasingly advanced. At present, the domestic daily processing oil refinery above 50t gross oil generally adopts the continuous oil refining technology. The disc centrifuge is the key equipment in the continuous oil refining technology. It is used to separate the grease from the oil foot or the soapstock and maintain the centrifuge disc. The smooth and smooth separation surface of the drum is conducive to the separation of the above materials. Not only can reduce the neutral oil content in the oil foot or soap foot, improve the refining rate, but also ensure the stability of the product quality.

Reasons for the fouling of a 1 Disc centrifuge The separation of grease and oil foot or soap foot from a disc centrifuge is accomplished by a set of discs in the drum and drum inside the centrifuge. The mixture of oil and soap or phospholipid enters into the disc group through the lower dispenser. In each disc interval, the oil is separated from the soap or phospholipid using the principle of thin layer separation. The oil flows upward along the surface of the disc, and the light phase is small. Centripetal pump discharge; soap foot or oil foot slides down the surface of the disc, passes through the inner wall of the drum, and is discharged by the large centrifugal pump of the heavy phase. A small amount of mechanical impurities in the oil is periodically discharged from the sliding piston and the sealing surface of the drum cover.

After a period of operation of the centrifuge, the surfaces of the discs and drums may become fouled. If they are not cleaned in time, they will not only seriously affect the separation effect of the centrifuges, resulting in an increase in the neutral oil content of the oil or soap feet. Increase; but also will reduce the output of stand-alone equipment, resulting in incomplete separation of soap or oil foot oil, affecting the quality of the product. There are several reasons for the fouling of discs in centrifuges: 1.1 Gross oil quality Pre-pumped oil Before different companies enter the refinery, different manufacturers will use different filtration processes to deal with it. If the filter effect is not good, pre-pumped oil It will contain more oil debris, muddy ash and other impurities. When the crude oil is subjected to hydration or alkali refining, the impurities will deposit on the disc of the centrifuge after a period of operation of the centrifuge.

Although leaching hair oil has undergone filtration, salting out and other processing procedures, but still contain froth, phospholipids and other organic impurities in the frying oil. When the frying oil enters the refining workshop for hydration or alkali refining, these impurities will also be found on the centrifuge disc. Scale up.

1.2 Water quality Generally, refineries do not attach importance to the process water and operation water quality of centrifuges. In actual production, untreated tap water, underground well water or natural water from rivers and lakes are often used. The hardness of these waters is seriously exceeded and centrifuged. After the machine meets the normal production process temperature, after a period of continuous operation, the calcium and magnesium ions in the water will form a layer of scale in the disc and the water channel inside the centrifuge drum, which will seriously affect the separation of the centrifuge. effect.

1.3 Operation of Centrifuge Operation of the centrifuge is not normal or operation is not good. The slag discharge of the centrifuge is not thorough. It fails to discharge the solid impurities in the drum in time. After a period of continuous operation, it will cause the centrifuge. Disc fouling, in severe cases, can even cause the drum to clog, causing the centrifuge to fail to work properly.

1.4 Working Temperature of Centrifuge Centrifuge with normal operation is at a high temperature of 90 *C for a long time. Because of the small amount of impurities and phospholipids in the oil, the water contains a small amount of inorganic salts. After a long period of continuous operation of the centrifuge, these substances will Scaling in the centrifuge discs and water sites, and more and more, resulting in the separation of the centrifuge difficulties D. Warner, Qin Hong Wan main translation. Bailey: Oil chemistry and technology Su Wang. Oil processing technology. Wuhan: He Dongping from Hubei Science and Technology. Oil factory design manual. Wuhan: Hubei Science and Technology Press, 1990 Welcome to subscribe to the 2002 "Food and Grease" comprehensive professional journals on grain, oil, and food, published at home and abroad, Postal Code 4 - 675. New technologies for grain and oil processing, grain and oil Resources utilization, grain and oil chemical industry, grain and oil office, large-scale professional information periodicals issued publicly at home and abroad. This publication provides authority. Accurate and quick information service is the main feature, and it is the paper media of China Feed Industry Information Network. The main service targets are industrial enterprise managers, decision makers of competent authorities, research and education institutions, livestock husbandry enterprises, and raw material suppliers related to the feed industry.

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