Design and development of alkali consistency online monitoring system for mercerizing machine based on measurement of alkali density

Aiming at the need of online monitoring of alkali consistency and alkali recovery in the mercerization process of cotton fabrics,an intelligent differential pressure type alkali consistency meter with Zig Bee wireless network communication function is developed according to the alkali densityconsistency characteristics. The measurement scope of the consistency meter is of 10- 770 g / L. It can solve the signal anti-interference problems during long distance transmission in multi-point measurement mode in the workshop,and reduce the system complexity and the development cost. Application of the consistency meter in the developed online alkali consistency monitoring system for the mercerizing machine realizes the functions of online automatic proportioning,mixing and delivery of alkali of certain consistency,and achieves the purpose of alkali recovery and the reduction of concentrated alkali consumption. A half-year field operation of the system approves that the control error can reach ± 5 g / L,and the concentrated alkali consumption for processing unit fabric can be reduced by more than 15%.