Method for circularly reutilizing flashing secondary steam of acid bath system

Abstract

The invention relates to a method for circularly reutilizing flashing secondary steam of an acid bath system. The method comprises the following steps: (1) respectively introducing secondary steam ofa flashing evaporation chamber V11 of the acid bath system in a viscose production system into a first-stage heat exchanger, secondary steam of an evaporation chamber V10 into a second-stage heat exchanger and secondary steam of an evaporation chamber V9 into a third-stage heat exchanger, so as to respectively generate heat exchange with circulating water in each heat exchanger; and (2) condensingthe secondary steam through heat exchangers, collecting condensed water for reuse, vacuumizing non-condensable gas in the secondary steam for reuse, introducing heater circulating water in the heat exchangers into a closed cooling tower, and cooling for reuse. According to the method, the volatilization of the peculiar smell of an acid bath evaporation system in the viscose industry is fundamentally solved, and meanwhile, the closed cooling tower adopting a special structure and technical principle can meet the requirement on the temperature of cooling water in a workshop and can stable workfor a long time, so that the water and the energy can be saved, the emission can be reduced, and the service life of process device is prolonged.

Description

technical field [0001] The invention relates to a method for recycling and reusing secondary steam by flashing in an acid bath system, and belongs to the technical field of viscose acid bath production. Background technique [0002] At present, most of the low-temperature secondary gas condensation in the flash evaporation system of the viscose staple fiber industry adopts a mixed condenser (MK) and an auxiliary condenser (HK) for cross-flow mixed condensation of circulating water. After the secondary steam is condensed, part of the hydrogen sulfide gas is dissolved in the circulating water. , and the circulating water is cooled by an open direct mixed cooling cooling tower. The hydrogen sulfide gas volatilizes during the cooling process, causing environmental pollution. It is also harmful to the human body and does not meet the national and local environmental protection requirements. From the perspective of corporate sustainable development and environmental protection rela...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the low-temperature secondary gas condensation in the flash evaporation system of the viscose staple fiber industry adopts a mixed condenser (MK) and an auxiliary condenser (HK) for cross-flow mixed condensation of circulating water. After the secondary steam is condensed, part of the hydrogen sulfide gas is dissolved in the circulating water. , and the circulating water is cooled by an open direct mixed cooling cooling tower. The hydrogen sulfide gas volatilizes during the cooling process, causing environmental pollution. It is also harmful to the human body and does not meet the national and local environmental protection requirements. From the perspective of corporate sustainable development and environmental protection related standards In the long run, such as increasingly strict, this problem also needs to be resolved urgently

Some manufacturers in the viscose industry try to use a new low-temperature secondary gas cooling process, which has high operating costs and is not suitable for actual production needs