Method and equipment for utilizing waste heat from corn starch production

Abstract

The invention belongs to the corn starch production technology field by a wet method, particularly relates to a use method of dry waste heat in the production process of corn starch and equipment thereof. The technical proposal of the invention is as follows: the waste heat use equipment in the production of corn starch comprises a fourth-effect evaporator, a washing tower, a flash evaporator, a corn steep liquor can and a corn soak solution can; the fourth-effect evaporator comprises a first-effect heating room, a first-effect separator, a second-effect heating room, a second-effect separator, a third-effect heating room, a third-effect separator, a fourth-effect heating room, a fourth-effect separator, and a condenser which are connected by pipelines; only the first-effect heating room is supplied with fresh steam; the second-effect heating room and the third-effect heating room respectively use secondary emission of a tube bundle and the tube bundle, and heat of condensed water by air drying for heating; and the fourth-effect heating room uses the waste heat and secondary steam of the first-effect heating room, the second-effect heating room and the third-effect heating room for heating. The invention can reduce the amount of fresh steam, and is a measure which can not be ignored for saving energy, reducing consumption, and increasing benefits of the enterprise.

Description

technical field [0001] The invention belongs to the technical field of wet production of corn starch, in particular to a method and equipment for utilizing drying waste heat in the production process of corn starch. Background technique [0002] Starch is the basic raw material of the food industry, mainly used in starch sugar and alcohol, maltodextrin, monosodium glutamate, plastic making, paper making, pharmaceuticals, fermentation and other industries. The world's starch production is 45 million tons, and more than 90% of the starch comes from corn. The production of starch from corn has the advantages of sufficient raw materials, mature technology, high powder yield, low production cost, and year-round production without seasonal restrictions. Corn starch The industry has developed into a worldwide emerging industry. The wet milling industry of corn has developed rapidly, which can effectively separate the various parts of the grain and produce high-purity starch and by-...

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Problems solved by technology

Among them, it is necessary to evaporate and concentrate the corn soaking liquid into a commercial corn steep liquor containing 40% dry matter in a three-effect evaporator, and fresh steam must be introduced into the three heating chambers, which requires a large amount of steam and heat consumption. In today's tense world, it brings a great economic burden to the enterprise; while the separated germ and fiber are dried by the tube bundle dryer during the corn starch processing process, the secondary waste gas of the tube bundle generated during drying passes through the cyclone dust collector and is directly discharged by the fan. It is discharged into the atmosphere, and the condensed water produced by the tube bundle is directly discharged or used as starch washing water after cooling down. During the drying process of starch, the condensed water generated by the starch air drying radiator is directly discharged or used as starch washing water after cooling down Among them, the secondary exhaust gas of the tube bundle has a high temperature of 110-90°C, the temperature of the tube bundle condensate water is about 130°C, and the temperature of the air drying condensate water is about 130°C. These large amounts of waste heat are not used, resulting in great waste.

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