Energy-saving and emission-reduction technologies in the chlor-alkali industry

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This post was last edited by Yu Re Yu Ya Fa Dian on 2016-12-9 09:05. Sources of waste heat: 1. A large amount of waste heat is generated during the production processes in the hydrochloric acid production stage, the soda ash production stage, the vinyl chloride production stage, and the drying stage. Currently, the waste heat with the highest value for utilization comes from the hydrochloric acid synthesis furnace; this furnace is of the steel-clad jacket type, and the exit temperature of the waste heat water (cooling water from the steel jacket) is generally around 90–100°C. With technological advancements and the development of hydrochloric acid synthesis furnace technology, the waste heat generated not only includes hot water but also steam (at 0.25 MPa and 0.8 MPa). 2. The steam condensate generated by the evaporation and concentration of alkaline solutions, as well as the circulating cooling water in vinyl chloride converters, all have utility values. Waste heat utilization: ORC screw expansion generator sets can be used to reduce the temperature of hot water from 90°C to 100°C to 80°C, so that it can be reused in the synthesis furnace. Energy-saving analysis: Typically, the hot water generated by such projects is used primarily for heating in winter. The use of ORC screw expansion generator sets allows for effective utilization of the waste heat produced during the production process. This not only eliminates the need for large-scale cooling systems required to cool the high-temperature water, but also reduces the amount of electricity consumed within the user’s factory, resulting in significant economic and environmental benefits.