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1.前言印染厂在其生产工艺过程中要消耗大量的热能、电能,尤以热能的用量最大,由于染整工艺需将大量的工业用水,加热到90℃～130℃,用于洗涤、漂白、染色等工序的热能消耗约占整个工艺过程中热能用量的80%,还有20%用于烘干及热定型工序。经过印染工艺后排出的废水温度达80℃以上。如果能把这部分热能加以回收,将带来可观的经济效益。只需用几个简单数据就可说明。假如一印染厂日排出温度为80℃废水100吨,若进行热能回收,将其处理到40℃以下,一天至少可以“回收”相当于一台2吨的锅炉。也可这样理解,工艺排出的废水温度为80℃,将20℃的清水通过热交换装置进行热能回收,若能向工艺提供60℃的热水,而工艺用水温度为80℃,那么所需的加热量为:
1. Introduction Printing and dyeing plants consume a large amount of heat energy and electric energy during their production process, especially the largest amount of heat energy. Due to the dyeing and finishing process, a large amount of industrial water is heated to 90°C to 130°C for washing and bleaching. The thermal energy consumption of the dyeing and other processes accounts for about 80% of the thermal energy consumption in the entire process, and 20% is used for drying and heat setting processes. After the printing and dyeing process, the temperature of discharged wastewater reaches 80°C or more. If this part of the heat energy can be recovered, it will bring considerable economic benefits. Just use a few simple data to explain. If a printing and dyeing factory discharges 100 tons of waste water at 80°C on a daily basis, if heat recovery is carried out, treat it to below 40°C and at least “recover” a boiler equivalent to 2 tons a day. It can also be understood that the temperature of the waste water discharged from the process is 80°C. The fresh water at 20°C is used for heat recovery through the heat exchange device. If the process can supply 60°C hot water and the process water temperature is 80°C, then the required Heating capacity is: