Glue fiber acid bath low temperature evaporation and continuous crystallization process and device thereof

Abstract

The invention discloses a glue fiber acid bath low temperature evaporation and continuous crystallization process and a device of the process. The process comprises an acid bath to be evaporated, an acid bath middle bucket, a conveying pump, a preheater, a heat exchanger A, an evaporator, a steam compressor, a heat exchanger A, a heat exchanger B, a discharge pump, a crystal pulp tank and a centrifuge, wherein the output of the acid bath middle bucket to be evaporated and crystallized is connected with the steam preheater through the conveying pump the condensed water preheater; the output of the steam preheater is connected with an evaporation crystallizer and the heat exchanger B through the heat exchanger A; the evaporation crystallizer and the heat exchanger B are in serial connection; the output of the evaporation crystallizer is connected with the crystal pulp tank through the discharge pump; the output of the crystal pulp tank is connected with a separator; the output of the separator is connected with a mother liquid tank. The energy is greatly saved; moreover as the evaporation and the crystallization are integrated, stable evaporation and continuous crystallization are achieved; meanwhile the whole set of the equipment is compact and reliable, the civil engineering investment is saved, small space is occupied, the number of operators needed is small, the operation is stable and reliable, and the whole system can be under configuration control and is highly automatic.

Description

technical field [0001] The invention relates to a viscose fiber acid bath low-temperature evaporation and continuous crystallization process and a device thereof. Background technique [0002] Viscose fiber is regenerated cellulose fiber. It is made of natural cellulose and spun after a series of physical and chemical processes. Viscose fiber is similar to natural cotton fiber and has good hygroscopicity, air permeability and dyeability. , Antistatic, comfortable to wear, are incomparable to synthetic fibers, its textiles are deeply loved by consumers, and have strong competitiveness in the market. Since the industrial production of viscose fiber, with the continuous development and improvement of viscose fiber technology and environmental protection technology, the output of viscose fiber has been increasing at a growth rate of more than 10% in recent years. So far, the domestic production capacity of viscose fiber has exceeded 3.5 million tons . [0003] The production o...

AI Technical Summary

Problems solved by technology

Disadvantages: (1) The acid bath passes through the 11-effect evaporating device, and the evaporating steam generated by the evaporators V9~V11 is sucked into the mixed condensers MK1 and MK2 and then condensed into water to be discharged. There is still a certain amount of heat energy in the evaporating steam that has not been absorbed Take advantage of;

[0006] (2) Condensation of evaporated steam into water also requires a large amount of cooling water and consumes a lot of power; (3) The vacuum degree is high, and generally a water ring vacuum plus a steam jet vacuum pump is required to meet the requirements;

[0007] (4) The whole set of equipment has many tank bodies, large volume, complicated pipelines and large floor space;

[0008] (5) Due to the problem of condensing and falling water brought by the vacuum and the acceleration of gravity, the installation of the whole set of devices should be higher than 9.8M of the water outlet, and the construction cost of the device is relatively high;

[0009] (6) The pipeline is complex, there are many control nodes such as valves, and the maintenance workload is relatively large

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