Fabric drying control method and device with multiple steam drying cylinders

Abstract

The invention discloses a fabric drying control method and device with multiple steam drying cylinders. The fabric drying control device with the multiple steam drying cylinders comprises at least eight steam drying cylinders, steam branch pipes communicating with all the steam drying cylinders, a steam main pipe communicating with all the steam branch pipes, and an electric controller. Each steambranch pipe or at least four steam branch pipes are provided with control valves with on-off functions. The control valves are controlled by the electric controller. Each steam drying cylinder is provided with a fabric moisture content or cloth temperature or steam drying cylinder temperature detecting mechanism which is connected with the electric controller. Moisture sensors are adopted as thefabric moisture content detecting mechanisms preferably. Temperature sensors are adopted as the cloth temperature or steam drying cylinder temperature detecting mechanisms. The device can ensure steaminput intensity and timely dewatering of the steam drying cylinders, the steam consumption amount is reduced, the drying efficiency is improved, the weight of the steam drying cylinders is preventedfrom being increased, and it is ensured that dried fabric meets the technology requirement.

Description

technical field [0001] The invention relates to a multi-steam drying cylinder fabric drying control method and device, belonging to the technical field of textile dyeing and finishing technology and equipment. Background technique [0002] Textile printing and dyeing enterprises use steam drying equipment to heat and dry fabrics with water. Steam drying equipment usually consists of at least 8 steam drying cylinders to form a column drying unit, and generally more than one column drying unit is used for drying Bring water to the fabric to make the drying fabric meet the process requirements. [0003] When the steam drying equipment is working, each steam drying cylinder introduces the steam in the steam main pipe into the steam drying cylinder through its own steam branch pipe to heat the steam drying cylinder. At the same time, the steam at a certain pressure can push the steam drying cylinder to exchange heat with the fabric The condensed water formed is discharged outwar...

AI Technical Summary

Problems solved by technology

Drum drying is a large inertia time-delay system. The use of proportional control valves to implement PID control and conventional differential advanced control methods is not ideal: on the one hand, it cannot meet the requirements of different temperature deviations and deviation change rates, and the dynamic control is not stable. , the fabric moisture content fluctuates greatly; the steady-state control deviation is large, and the control adjustment time is long

Moreover, when the controlled proportional regulating valve is in the middle or small opening state, the steam pressure entering the steam dryer is too small, which is far from enough to push the condensed water to be discharged from the steam trap through the pipeline, and the inner cavity of the steam dryer is seriously accumulated. Water brings several disadvantages:

[0005] ①A large amount of condensed water accumulates, and the steam dryer obviously shows a dynamic imbalance. The fabric is easy to wrinkle on the steam dryer, and a large area of ​​fabric defects occurs, which seriously affects the normal operation of the subsequent finishing process;

[0006] ②Severe accumulation of water in the inner cavity of the steam drying cylinder greatly reduces the heat exchange area, and the production process temperature that the steam drying cylinder can achieve decreases, resulting in slow production speed, low production efficiency, and affects product quality;

[0007] ③A lot of condensed water accumulates, forming water hammer and aggravating the wear of the pipe wall, valves and connecting parts, the maintenance workload is heavy and the cost is high; the self-weight of the steam dryer increases, which creates a safety hazard when rotating;

[0008] On the other hand, when the process is replaced in continuous production, the time-delay system of the drying cylinder and the slow response of the PID adjustment control cause the dried fabrics to fail to meet the process requirements, and the quality of the dried cloth cannot be guaranteed, which affects the increase in production capacity.

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