阅读说明：本技术 用于粘胶纤维精炼的节水系统及节水方法 (Water saving system and water saving method for viscose fiber refining ) 是由 马杰 于 2020-05-18 设计创作，主要内容包括：本发明公开了一种用于粘胶纤维精炼的节水系统及节水方法,所述粘胶纤维精炼的节水系统按照粘胶纤维处理的顺序依次连接有一水水洗槽、粘胶纤维脱硫装置、二水水洗槽、粘胶纤维漂白装置、三水水洗槽、酸洗槽、终水水洗槽和轧车装置；其中,所述一水水洗槽包括第一一水洗水洗槽和与所述第一一水水洗槽连接的第二一水水洗槽；所述二水水洗槽包括第一二水水洗槽和与所述第一二水水洗槽连接的第二二水水洗槽。本发明通过用于粘胶纤维精炼的节水系统,将再生粘胶纤维素纤维精炼工艺的水使用量大幅度降低,减少排放水量,并节约了精炼单元的蒸汽使用量,节约能源,降低了粘胶纤维生产成本。(The invention discloses a water-saving system and a water-saving method for viscose fiber refining, wherein the water-saving system for viscose fiber refining is sequentially connected with a first water washing tank, a viscose fiber desulphurization device, a second water washing tank, a viscose fiber bleaching device, a third water washing tank, a pickling tank, a final water washing tank and a padder device according to the treatment sequence of viscose fibers; the first water washing tank comprises a first water washing tank and a second water washing tank connected with the first water washing tank; the second water washing tank comprises a first second water washing tank and a second water washing tank connected with the first second water washing tank. The water-saving system for refining the viscose fibers greatly reduces the water consumption of the refining process of the regenerated viscose fibers, reduces the water discharge amount, saves the steam consumption of a refining unit, saves energy and reduces the production cost of the viscose fibers.)

1. The water-saving system for viscose fiber refining is characterized in that the water-saving system for viscose fiber refining is sequentially connected with a primary washing tank, a viscose fiber desulphurization device, a secondary washing tank, a viscose fiber bleaching device, a tertiary washing tank, a pickling tank, a final washing tank and a padder device according to the treatment sequence of viscose fibers;

the first water washing tank comprises a first water washing tank and a second water washing tank connected with the first water washing tank;

the second washing tank comprises a first second washing tank and a second washing tank connected with the first second washing tank;

the final water rinsing tank comprises a first final water rinsing tank and a second final water rinsing tank connected with the first final water rinsing tank;

the second first water washing tank and the second water washing tank are respectively connected with an acid station condensed water collecting device;

the padder device is connected with the first final water rinsing tank and the second final water rinsing tank through a padder water collecting device;

the first final water rinsing bath is respectively connected with the second first water rinsing bath, the first final water rinsing bath and the second final water rinsing bath through a membrane separation device;

the three-water washing tank is connected with a soft water supply device.

2. The water conservation system for viscose fiber refining as recited in claim 1,

and microfiltration devices are arranged between the acid station condensed water collecting device and the second first water washing tank and between the acid station condensed water collecting device and the second water washing tank.

3. The water saving system for viscose fiber refining according to claim 2,

and a neutralization device is also arranged between the acid station condensed water collecting device and the microfiltration device.

4. The water conservation system for viscose fiber refining as recited in claim 1,

the first washing tank and the first second washing tank are respectively connected with a drainage device.

5. The water conservation system for viscose fiber refining as recited in claim 1,

viscose fiber desulphurization unit includes first viscose fiber desulphurization unit and with the second fine viscose fiber desulphurization unit that first viscose fiber desulphurization unit is connected.

6. The water conservation system for viscose fiber refining as recited in claim 1,

viscose bleaching device is including the first viscose bleaching device, second viscose bleaching device, third viscose bleaching device and the fourth viscose bleaching device that connect gradually.

7. A method for saving water by using the water saving system for viscose fiber refining of claim 1, characterized by comprising the following steps:

adding viscose fibers to be treated into the first water washing tank for washing, wherein water for the first water washing tank comes from the second water washing tank, the viscose fibers are conveyed to the second water washing tank for washing, and the water for the second water washing tank comes from a concentrated solution of the condensed water collecting device and the membrane separation device of the acid station;

the viscose fibers washed by the second first washing tank enter the first second washing tank after being treated by the viscose fiber desulphurization device, the water used by the first second washing tank comes from the second washing tank, and the water used by the second washing tank comes from the acid station condensed water collection device and the third washing tank;

the viscose fibers after being washed by the second washing tank enter the viscose fiber bleaching device, the viscose fibers after being treated by the viscose fiber bleaching device enter the three-water washing tank for washing, and water for the three-water washing tank comes from the soft water supply device;

after passing through the pickling tank, the viscose fibers washed by the three water washing tanks enter the first final water washing tank for washing, the water used by the first final water washing tank comes from the second final water washing tank and the padder water collecting device, and the water used by the first final water washing tank enters the membrane separation device for treatment;

the viscose fibers after being washed by the first final water washing tank enter the second final water washing tank for washing, and water used by the second final water washing tank comes from a filtrate of the membrane separation device;

and the viscose fibers after being washed by the second final water washing tank are processed by a padder device and then enter a subsequent processing flow.

8. The method of claim 7,

and water in the condensed water collecting device of the acid station is neutralized by alkali liquor of the neutralizing device until the pH value is 6-8, and then enters the second water washing tank after being filtered by the microfiltration device.

9. The method of claim 7,

the membrane separation device adopts a reverse osmosis membrane or a nanofiltration membrane.

Technical Field

The invention relates to the technical field of cellulose production, in particular to a water saving system and a water saving method for viscose fiber refining.

Background

Viscose (Viscose), a generic name for Viscose, cellulose fibers obtained by extracting and remolding fiber molecules from natural wood cellulose using "wood" as a raw material; the hygroscopicity of the viscose fiber meets the physiological requirements of human skin, and the viscose fiber has the characteristics of smoothness, coolness, air permeability, static resistance, ultraviolet resistance, gorgeous color, good dyeing fastness and the like; it has the nature of cotton, the quality of silk; is a genuine plant fiber which is from nature and is superior to nature. The regenerated cellulose fibers spun, drawn and cut contain a series of impurities, including acid bath residues carried out by the tow, colloidal sulfur generated during the forming process, and attached metal salts such as calcium, iron and the like, which have great influence on the quality of the fibers and the processing thereof and need to be removed through post-treatment. Simultaneously, the fiber is bleached and oiled. The whole refining process at least comprises 4 washing processes, and softened fresh water is used. The water consumption of each ton of fiber in the water washing section is about 8-11 tons. It has large water consumption and high manufacturing cost, and the discharged sewage easily causes damage to the environment.

Disclosure of Invention

Therefore, the invention provides a water-saving system and a water-saving method for refining viscose fibers.

In order to solve the above problems, the present invention provides the following technical solutions:

the water-saving system for viscose fiber refining is sequentially connected with a primary washing tank, a viscose fiber desulfurization device, a secondary washing tank, a viscose fiber bleaching device, a tertiary washing tank, a pickling tank, a final water washing tank and a padder device according to the treatment sequence of viscose fibers;

the first water washing tank comprises a first water washing tank and a second water washing tank connected with the first water washing tank;

the second washing tank comprises a first second washing tank and a second washing tank connected with the first second washing tank;

the final water rinsing tank comprises a first final water rinsing tank and a second final water rinsing tank connected with the first final water rinsing tank;

the second first water washing tank and the second water washing tank are respectively connected with an acid station condensed water collecting device;

the padder device is connected with the first final water rinsing tank and the second final water rinsing tank through a padder water collecting device;

the first final water rinsing bath is respectively connected with the second first water rinsing bath, the first final water rinsing bath and the second final water rinsing bath through a membrane separation device;

the three-water washing tank is connected with a soft water supply device.

Preferably, microfiltration devices are arranged between the acid station condensed water collecting device and the second first water washing tank and between the acid station condensed water collecting device and the second water washing tank.

Preferably, a neutralization device is further arranged between the acid station condensed water collecting device and the microfiltration device.

Preferably, the first washing tank and the first rinsing tank are respectively connected with a drainage device.

Preferably, the viscose fiber desulphurization device comprises a first viscose fiber desulphurization device and a second viscose fiber desulphurization device connected with the first viscose fiber desulphurization device.

Preferably, the viscose bleaching device comprises a first viscose bleaching device, a second viscose bleaching device, a third viscose bleaching device and a fourth viscose bleaching device which are connected in sequence.

The invention provides a water-saving method for a water-saving system for viscose fiber refining, which comprises the following steps:

adding viscose fibers to be treated into the first water washing tank for washing, wherein water for the first water washing tank comes from the second water washing tank, the viscose fibers are conveyed to the second water washing tank for washing, and the water for the second water washing tank comes from a concentrated solution of the condensed water collecting device and the membrane separation device of the acid station;

the viscose fibers washed by the second first washing tank enter the first second washing tank after being treated by the viscose fiber desulphurization device, the water used by the first second washing tank comes from the second washing tank, and the water used by the second washing tank comes from the acid station condensed water collection device and the third washing tank;

the viscose fibers after being washed by the second washing tank enter the viscose fiber bleaching device, the viscose fibers after being treated by the viscose fiber bleaching device enter the three-water washing tank for washing, and water for the three-water washing tank comes from the soft water supply device;

after passing through the pickling tank, the viscose fibers washed by the three water washing tanks enter the first final water washing tank for washing, the water used by the first final water washing tank comes from the second final water washing tank and the padder water collecting device, and the water used by the first final water washing tank enters the membrane separation device for treatment;

the viscose fibers after being washed by the first final water washing tank enter the second final water washing tank for washing, and water used by the second final water washing tank comes from a filtrate of the membrane separation device;

and the viscose fibers after being washed by the second final water washing tank are processed by a padder device and then enter a subsequent processing flow.

Preferably, the water in the condensed water collecting device of the acid station is neutralized by alkali liquor of the neutralizing device until the pH value is 6-8, and then enters the second water washing tank after being filtered by the microfiltration device.

Preferably, the membrane separation device adopts a reverse osmosis membrane or a nanofiltration membrane.

The invention has the following advantages:

the water-saving system and the water-saving method for refining the viscose cellulose greatly reduce the water consumption of the refining process of the regenerated viscose cellulose fiber, reduce the water discharge amount, save the steam consumption of a refining unit, save energy and reduce the production cost of the regenerated viscose cellulose fiber. In addition, the method is simple and convenient to operate, simple in process, high in heat utilization rate, greatly reduced in environmental-friendly emission, high in economic benefit and suitable for popularization and application in the cellulose fiber vitamin production industry.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a schematic diagram of the water saving system for refining viscose fiber according to the present invention;

FIG. 2 is a schematic diagram showing the components of another embodiment of the water saving system for refining viscose provided by the invention;

in the figure: 100-a first washing tank with water; 200-a second washing water tank; 300-a first viscose fibre desulphurisation unit; 400-a second viscose fiber desulphurization unit; 500-a first and second aqueous washing tank; 600-a second water washing tank; 700-a first viscose bleaching unit; 800-a second viscose bleaching device; 900-a third viscose bleaching unit; 110-a fourth viscose bleaching plant; 120-three-water washing tank; 130-a pickling tank; 140-first final water wash tank; 150-second final water rinsing bath; 160-padder devices; 170-a microfiltration device; 180-acid station condensed water collecting device; 190-a neutralization device; 220-a membrane separation unit; 230-padder water collection device.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 and 2, the present invention provides a water saving system for viscose refining, which is sequentially connected with a primary water washing tank, a viscose desulfurization device, a secondary water washing tank, a viscose bleaching device, a tertiary water washing tank 120, a pickling tank 130, a final water washing tank and a padder device 160 in order of viscose treatment; wherein the first water washing tank comprises a first water washing tank 100 and a second water washing tank 200 connected with the first water washing tank 100; the second washing tank comprises a first second washing tank 500 and a second washing tank 600 connected with the first second washing tank 500; the final water rinsing bath includes a first final water rinsing bath 140 and a second final water rinsing bath 150 connected to the first final water rinsing bath 140; the second first water washing tank 200 and the second water washing tank 600 are respectively connected with the acid station condensed water collecting device 180.

The padder device 160 is connected to the first and second final-water washing tanks 140 and 150 through a padder water collecting device 230; the first final water washing tank 140 is respectively connected with the second first water washing tank 200, the first final water washing tank 140 and the second final water washing tank 150 through the membrane separation device 220, so that the water used in the first final water washing tank 140 is purified through the membrane separation device 220 under the condition of not reducing the temperature, and the treated water can be directly supplied to the second first water washing tank 200 and the second final water washing tank 150 for use; the three-water washing tank 120 is connected with a soft water supply device. The water-saving system for viscose fiber refining also comprises a circulating pump, and all devices are connected through the circulating pump to convey used water. The system for circular treatment can realize more than 50-90% of water for final washing, and uses padder press water to replace softened fresh water, thereby greatly reducing water consumption, reducing water discharge and reducing the production cost of viscose cellulose.

The microfiltration device 170 is arranged between the acid station condensed water collecting device 180 and the second first water washing tank 200 and between the acid station condensed water collecting device 180 and the second water washing tank 600, specifically, the microfiltration device is a filtering device with the diameter of 1-100 micrometers, so that the acid station evaporated condensed water is directly used for treating the second first water washing tank 200 and the second water washing tank through the microfiltration device 170 without being cooled.

As shown in fig. 1, as an alternative embodiment, a neutralization device 190 is further disposed between the acid station condensed water collection device 180 and the microfiltration device 170, and a part of water in the acid station condensed water collection device 180 enters the neutralization device 190, the pH value of the water in the neutralization device 190 is adjusted to 6-8, and then the water is treated by the microfiltration device 170 and then enters the second secondary water washing tank 600 to perform washing treatment on viscose fibers.

The first washing tank 100 and the first second washing tank 500 are respectively connected with a drainage device, and the wastewater after the viscose fiber is treated in the first washing tank 100 and the second washing tank 600 is discharged to the environment through the drainage devices.

Wherein, the viscose fiber desulphurization device comprises a first viscose fiber desulphurization device 300 and a second viscose fiber desulphurization device 400 connected with the first viscose fiber desulphurization device 300. The viscose bleaching device comprises a first viscose bleaching device 700, a second viscose bleaching device 800, a third viscose bleaching device 900 and a fourth viscose bleaching device 110 which are connected in sequence. After the viscose fiber is subjected to multiple desulfurization and multiple bleaching, the movable fiber quality of the viscose fiber is better.

The invention also provides a water-saving method using the water-saving system for viscose fiber refining, which comprises the following steps:

adding viscose fibers to be treated into a first washing tank 100 for washing, wherein the first washing tank 100 uses water from a second washing tank 200, the viscose fibers washed by the first washing tank 100 enter the second washing tank 200 for washing, and the water in the second washing tank 200 comes from a concentrated solution of an acid station condensed water collecting device 180 and a membrane separation device 220;

the viscose fibers washed by the second first water washing tank 200 enter a viscose fiber desulphurization device for treatment and then enter a first second water washing tank 500, the water used by the first second water washing tank comes from a second water washing tank 600, and the water used by the second water washing tank 600 comes from an acid station condensed water collection device 180 and a third water washing tank 120;

the viscose fiber after being washed by the second water washing tank 600 enters a viscose fiber bleaching device, the viscose fiber after being treated by the viscose fiber bleaching device enters a third water washing tank 120 for washing, and the water used by the third water washing tank 120 comes from a soft water supply device;

the fiber washed by the three-water washing tank 120 passes through the pickling tank 130 and then enters the first final-water washing tank 140 for washing, the water used by the first final-water washing tank 140 comes from the second final-water washing tank 150 and the padder water collecting device 230, and the water used by the first final-water washing tank 140 enters the membrane separation device 220 for treatment, wherein the treatment of the membrane treatment device comprises two steps of pretreatment and membrane treatment, wherein the pretreatment system uses a 1-10 mu m precision filter to remove solid impurities in the water.

The viscose fiber after being washed by the first final water washing tank 140 enters a second final water washing tank 150 for washing, and the second final water washing tank 150 uses water from a membrane separation device 220 to obtain filtrate;

the viscose fibers washed by the second final water washing tank 150 are processed by a padder device 160 and then enter a subsequent processing flow.

In the present invention, preferably, the water in the condensed water collecting device 180 of the acid station is neutralized by the alkali solution of the neutralizing device 190 to a pH value of 6 to 8, and then filtered by the micro-filtration device 170 and enters the second water washing tank 600. In the neutralization device 190, pH is continuously adjusted and an on-line pH instrument is used to detect the water discharged from the neutralization device 190 and adjust the amount of alkali used at the right time.

Preferably, the padder water collection device 230 enters the first final water wash tank 140. Wherein, the membrane separation device 220 adopts a reverse osmosis membrane or a nanofiltration membrane, the membrane separation device 220 can be operated intermittently or continuously, and the once treatment yield is 50-90%.

Test examples

The water usage of the existing system was compared to the water usage of the water saving system for viscose refining of the present invention as shown in table 1. In the existing system, the first water washing tank, the second water washing tank, the third water washing tank and the final water washing tank are all from a soft water supply device.

TABLE 1

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.