A method for recovering low-temperature waste heat from cooling circulating water in a sugar factory

Abstract

The invention discloses a low temperature exhaust heat recovery process of circulation cooling water of a sugar refinery. The process mainly consists of a plate heat exchanger, a buffer tank, a circulating tank, a pipeline pump, a circulating pump and a heat pump main machine. According to low temperature circulation cooling water (averagely at 45 DEG C) generated in the sugar making production process, low grade cooling water which cannot be utilized in the sugar making production process of the sugar refinery is extracted through the process and is converted into high grade utilizable heat energy (adjustable in temperature in a range of 55-60 DEG C) for re-production (for example, heating of pre-limed mixed juice or other energy consuming processes). The process disclosed by the invention not only can recover the low temperature exhaust heat of the cooling water, but also can provide the cooling water (adjustable in temperature in a range of 5-30 DEG C). For the sugar making enterprise, not only is the unit energy consumption for making sugar reduced, but also high quality low temperature cooling water is provided, and thus the yield of sugar and the quality of sugar are greatly improved.

Description

technical field [0001] The invention relates to a waste heat recovery process of industrial tail water at 10°C to 100°C, in particular to a low-temperature waste heat recovery method for cooling circulating water in a sugar factory. Background technique [0002] The evaporating tank and sugar boiling tank in the sugar factory need a certain degree of vacuum to ensure the normal operation of evaporating and boiling sugar. The vacuum degree of evaporation and cooking sugar is low, which has a great impact on the production capacity, product quality and recovery rate of the sugar factory. Therefore, in the vacuum condensation system of the sugar factory, a large amount of cold water must be used to condense and discharge the low-temperature juice vapor in the evaporation tank and the sugar cooking tank to obtain the required vacuum degree, which is a necessary condition for the normal production of the sugar factory. At present, most sugar factories recycle the warm water disc...

AI Technical Summary

Problems solved by technology

However, the cooling effect of natural cooling depends to a large extent on the structure of the cooling system, ambient temperature, air humidity, circulating cooling water temperature, etc. If the cooling effect is not good, it will affect the abnormal operation of evaporative sugar cooking

On the other hand, the cooling of warm water is to use the natural air to take away the heat of the water, that is, the huge low-temperature waste heat in the warm water is lost in the natural air. One: it needs electric energy to drive the cooling tower and the circulation pump consumes precious electric energy , 2: A large amount of low-temperature heat energy is wasted in vain 3: It forms a local "heat island effect" on the environment

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