Application of Spiral Plate Heat Exchanger in Alcohol Production

With the increase in alcohol production in recent years, water consumption has also increased. Every summer, rural water is in short supply and lack of water sources cannot guarantee normal production. The increase in production water also increases the workload of sewage disposal. In this situation, after repeated research, experimentation, and transformation of the cooling system, the spiral plate heat exchanger was used. The results verify that the spiral plate heat exchanger not only reduces the water consumption in the alcohol production process, but the set temperature is also relatively large, which takes up space. Small, greatly reduce the failure rate, save maintenance funds, save energy and reduce consumption, and ensure the smooth progress of production.

Alcohol production uses renewable resource grains as raw materials, mechanically crushed, added water to make a slurry, and then undergoes a series of processes such as liquefaction, gelatinization, saccharification, and fermentation, and then distills to extract high-purity alcohol.

During the production process, the temperature of the pre-liquefied mash during liquefaction is controlled between 80~90℃ (potatoes) and 90~97℃ (cereals). In the preparation of liquefied mash, the starch in the powder slurry is rapidly hydrolyzed into soluble dextrin, a small amount of maltose and glucose by using high temperature resistant α-amylase at a certain temperature. The temperature of the liquefied mash after liquefaction is higher, often between 95~105℃, and it needs to be cooled to between 58~62℃ for saccharification. The mashed mash after saccharification needs to be cooled to 28~38°C before the yeast can be cultivated and fermented. Moreover, in the early stage of fermentation, due to the growth of microorganisms, a certain amount of bio-heat is released by the biochemical reaction, and it is necessary to cool in time to maintain a suitable fermentation temperature to ensure the smooth progress of the fermentation process. Due to the high temperature of the liquefied mash, the cooling can be achieved by vacuum cooling and atmospheric air cooling. And after saccharification to fermentation cooling method, the multilayer coil spray cooling method I originally used, that is, water is sprayed on the copper multilayer coil, because the heat exchange area of ​​the cold water and the copper tube is small, and the heat exchange efficiency is low; fermentation The fermentation tank used in the early stage has built-in multi-layer serpentine cooling pipes and outer wall cooling. Because of the biochemical heat generated in the early stage of fermentation, it needs to be continuously pumped to cool. Because the latter two processes both consume a lot of energy and water, both of them now introduce high-efficiency heat exchanger equipment-spiral plate heat exchangers.

Shandong Bojing Chemical Machinery Co., Ltd. was established in 2007. It is a professional manufacturer in the field of fine chemical equipment. The company's products are mainly stainless steel, titanium, nickel, Monel and other non-ferrous materials. It is an integrated design, research and development, and manufacturing. Sexual high-tech enterprises. The core products are widely used in the treatment of waste water and waste gas in biochemical and fine chemical plants, as well as for energy conservation and efficiency enhancement. The company has pressure vessel (level D) manufacturing qualification and ASME certification issued by the General Administration of Quality Supervision, Inspection and Quarantine.

The structure principle and use method of spiral plate heat exchanger: spiral plate heat exchanger is a kind of high-efficiency heat exchanger equipment. According to the structure form, it can be divided into non-removable type (Ⅰ type) spiral plate type and detachable type (Ⅱ type, Ⅲ) Type) spiral plate heat exchanger.

The spiral plate heat exchanger is rolled by two plates to form two uniform spiral channels. The two heat transfer media can flow in full countercurrent flow, which greatly enhances the heat exchange effect. Even with two small temperature difference media, it can Achieve the ideal heat exchange effect. The connecting pipe on the shell adopts a tangential structure, and the local resistance is small. Because the curvature of the spiral channel is uniform, there is no big turning of the liquid flow in the equipment, and the total resistance is small, so the design flow rate can be increased to make it have a higher transmission. Thermal capacity. The structural principle of the type II detachable spiral plate heat exchanger is basically the same as that of the non-detachable heat exchanger, but one of the channels can be detached and cleaned, which is especially suitable for heat exchange with viscous and precipitated liquids. A single device cannot meet the requirements of use. At this time, two spiral plate heat exchangers from Wuxi Xuelang Fermentation Engineering Equipment Factory, which are currently used after saccharification, can be used in combination. The heat exchange area is 120m2 and the passage is 20cm for the early fermentation tank cooling to reduce the heat generation during the main fermentation period.