Method for recycling and using water in maturation process in production of viscose fiber

Abstract

The invention discloses a method for recycling and using water in maturation process in production of viscose fiber. The method is characterized in that the method comprises the following steps: a. normal temperature production water or soft water is introduced into a first plate type heat exchanger, high temperature maturation drum jacket water is introduced into the first plate type heat exchanger, after heat exchange, high temperature production water or soft water flows into a recycled water tank through a return pipe, and after cooling, the maturation drum jacket water flows back to the maturation drum; b. a centrifugal pump pumps high temperature production water or soft water in the recycled water tank into a second plate type heat exchanger, and normal temperature soft water is introduced into the second plate type heat exchanger; c. low temperature production water or soft water whose heat is exchanged by the second plate type heat exchanger flows into the maturation drum for adjusting maturation drum jacket water temperature, and after heat exchange, high temperature soft water is used for blending alkaline liquor. Temperature differences of different mediums are used in order to improve utilization rate of production water and soft water, at the same time, waste heat resource is reutilized, steam consumption is reduced, and gradient utilization of the maturation drum jacket water thermal energy is realized.

Description

technical field [0001] The invention relates to the field of viscose fiber production, in particular to a method for recycling water in an aging process in viscose fiber production. Background technique [0002] In the production of viscose fiber, the preparation process of the stock solution is: feeding → dipping → pressing → crushing → alkali cellulose → aging → yellowing → cellulose xanthate → dissolving and stirring → filtration → vacuuming → viscose solution. [0003] Among them, the main purpose of the aging process is to reduce the degree of polymerization of alkali cellulose, so as to obtain alkali cellulose with a uniform degree of polymerization. The aging process is mainly carried out in the aging drum. When the alkali cellulose is aged, the temperature of the alkali fiber just after pressing and pulverizing is relatively high. Therefore, a fan is usually installed at the material outlet of the aging drum to directly feed the alkali cellulose. Cold air treatment ...

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Problems solved by technology

[0008] The waste water thermal energy utilization method disclosed in this patent document is applicable to the viscose staple fiber industry, mainly for waste water recycling and utilization of plasticizing tank condensate water, refining sewage, and refining overflow hot water, which belongs to the scope of water used in the post-production process of viscose, but The old drum jacket water in the pre-production process of viscose cannot be well utilized, resulting in waste of water resources and excessive steam consumption in the pre-production process of viscose

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