Sustainability Improvement of Kazakh Chemical Industry via Process Integration: A Case Study of Calcium Chloride Production
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Дата
2019
ORCID
DOI
Науковий ступінь
Рівень дисертації
Шифр та назва спеціальності
Рада захисту
Установа захисту
Науковий керівник
Члени комітету
Видавець
The Italian Association of Chemical Engineering
Анотація
This work presents the analysis of the calcium chloride concentration unit to reduce energy consumption and harmful emissions. The concentration of the calcium chloride in the raw materials is 14 % (mass) and a concentrated solution has 35 % of CaCl₂. Process Integration techniques were used for the analysis of the existing process to identify bottlenecks and disadvantages. A Pinch approach was executed to get real energy targets, energy gap and possible ways for process update. The authors proposed the solution for the process improvement using traced Grid Diagram and detailed simulation of the parameters of heat exchangers and evaporation units to get a feasible and economically beneficial retrofit. The representative case study of a Kazakh chemical factory was presented. There are some barriers to the development of the profitable and feasible solution, e.g. process constraints and limited performance of existing equipment. It forces developing a local methodology to apply the case study in an appropriate and most profitable way. The energy consumption of the inspected unit is 25 % higher than the target value. Nevertheless, the 1st feasible retrofit case with a detailed simulation of heat exchanger network parameters has only 17 % less energy consumption but, at the same time, the improved operating conditions of the evaporation unit were achieved. The 2nd retrofit option reduces the energy consumption by 22 % and more complicated network with additional operation changes was proposed. The results of this work may be used for the energy saving retrofit of the industrial evaporation units and decreasing the environmental impact of the chemical industry in Kazakhstan.
Опис
Ключові слова
sustainability improvement, Kazakh Chemical Industry, Calcium Chloride Production, traced Grid Diagram, Heat Integration, Mixed-Integer Nonlinear Programming, Single-Effect Evaporation, Multiple-Effect Evaporation
Бібліографічний опис
Sustainability Improvement of Kazakh Chemical Industry via Process Integration: A Case Study of Calcium Chloride Production / Stanislav Boldyryev, Alisher Khussanov, Kostiantyn Gorbunov, Olha Gorbunova // Chemical Engineering Transactions. – 2019. – Vol. 76. – P. 1231-1236.