Drying and adjusting process and device for viscose fibers

Abstract

The invention discloses a drying and adjusting process for viscose fibers. The process comprises the following steps of: 1) feeding the viscose fibers into a superheated vapor drier in a front area by a feeder; feeding a drying medium heated by a vapor coil into a drying chamber of the superheated vapor drier in the front area; drying the viscose fibers; evaporating water of the viscose fibers during drying; increasing pressure; and discharging out excessive water vapor to an oscillating-flow heat pipe heat exchanger through the linkage of a pressure controller and an induced draft fan; 2) under an effect of a chain conveying device, conveying the viscose fibers to a superheated vapor drier in a middle area, wherein the drying process in the middle area is similar to that in the front area; meanwhile, discharging out the excessive water vapor to the oscillating-flow heat pipe heat exchanger; and 3) heating the recycled water vapor in the oscillating-flow heat pipe heat exchanger into fresh air; feeding the fresh air into a hot air drier in a back area, so as to finish deep drying and adjusting of the viscose fibers; obtaining the dried viscose fibers; and emptying tail gas. The invention further discloses a device of the process. The viscose fibers with high qualities can be obtained; and energy consumption is reduced by 35-40%.

Description

technical field [0001] The invention relates to a drying and adjusting process and device for viscose fiber. Background technique [0002] Viscose fiber has always been regarded as a high-pollution, high-energy-consuming, high-cost industry. At present, my country's viscose fiber production accounts for about 60% of the world's production, resulting in a large increase in energy consumption and sewage discharge, energy consumption and environmental protection issues. It has become one of the "bottleneck" problems restricting the further rapid development of my country's viscose industry. Among them, the overall energy consumption level of the viscose industry is 10-30% higher than the international advanced level. In addition, there are still many problems in the treatment of "three wastes". Therefore, energy saving and emission reduction have become the core tasks of the sustainable development of the viscose industry. [0003] In the viscose fiber industry, the dryer is o...

AI Technical Summary

Problems solved by technology

The dry tail gas in this traditional drying system cannot effectively recover waste heat. There are two main reasons for this: first, the drying medium used in these three sections is a mixture of steam and air, and the dry tail gas contains a large amount of unwanted Condensable gas, and the specific heat of air is small, only a small part of the sensible heat of the dry exhaust gas can be recovered after the heat exchanger is installed; In the fin-and-tube heat exchanger, the capillary fibers will accumulate on the fins, blocking the passage and reducing the surface heat transfer coefficient

Therefore, in the existing viscose fiber drying process, the waste heat of the drying tail gas cannot be effectively recovered, resulting in a huge waste of energy

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