Application of evaporator getting the calcium chloride from waste soda production
DOI:
https://doi.org/10.15587/1729-4061.2013.9186Keywords:
evaporator, forced circulation, calcium chloride, waste, soda.Abstract
The article deals with questions of low-waste and non-waste creation technologies in multitonnage soda production. Analysis of waste water in the production of soda shows that the main type of pollution is calcium chloride. Utilization of calcium chloride gives the opportunity to reduce ponds - storages (“white seas”), and the refined calcium chloride produced is used in metallurgical, chemical, food (in the production of cheese, yogurt, milk, jam, jelly, marmalade, canned vegetables and fruit as a food additive E-509 (calcium chloride), with the extraction of oil), and other industries. Producing of refined calcium chloride from distilled liquid soda production with 67 % of calcium chloride by evaporating is considered in this article. The implementation of process is recommended to fullfill in evaporators of multi-units. The schemes of multi-evaporator systems that significantly reduce the amount of heating steam are dealt with. It is proposed to use the counter-movement scheme midium, since this method has several advantages: there is no significant drop in heat transfer coefficient in shell with the most concentrated solution, and the heat transfer coefficients change a little in the cases, at counter-feeding the amount of water evaporated in the last case is less than at direct-feeding and it results in less load on condensor (at vacuum evaporation ). It is shown that the application of the evaporator with forced circulation increases capacity of unit in ~ 3 times, and the duration of work to the cleaning in ~ 2 times.References
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