Desulfurization device for viscose fiber post-treatment
By setting up multiple desulfurization stations and leaching tanks with specific structures in the viscose fiber post-treatment device, combining the return liquid control and waste alkali reuse, the problems of high loss and poor effect of the desulfurization liquid are solved, and an efficient and environmentally friendly desulfurization process is achieved.
Patent Information
- Application Number
- CN202422408142.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The desulfurization liquid in the existing viscose fiber post-treatment device has too high loss and the desulfurization effect is poor, especially the double-sided rinsing method leads to slow flow rate and difficult to penetrate the desulfurization liquid quickly.
Multiple desulfurization stations are set up, each station is equipped with a press roller, a leaching tank and a liquid contact tank, and the return ratio is controlled through the liquid return main pipe, the second liquid discharge pipe and the control valve to reduce the loss of the desulfurization liquid; the leaching tank is designed with an inclined and horizontal structure to improve flow rate and permeability, the filter plate and pipeline filter reduce foreign matter, and waste alkali supplements the pipe to reuse waste alkali.
It has achieved effective reduction of desulfurization liquid, improved desulfurization effect and product cleanliness, and enhanced environmental protection and economicality.
Smart Images
Figure CN223214221U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a desulfurization device for post-processing viscose fibers, which is applied in the field of viscose fiber equipment processing. Background Art
[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
[0003] Viscose fiber has excellent hygroscopicity and is naturally biodegradable, and has been widely used in clothing, decoration, medical and sanitary materials, and other fields. Viscose fiber is made from natural cellulose as the basic raw material. It is made into a viscose stock solution through alkalization and yellowing reactions, and then produced by wet spinning. After the viscose fiber is formed, it undergoes post-processing steps such as washing, desulfurization, bleaching, oiling, and drying to become a finished product. Among them, desulfurization is to convert the water-insoluble colloidal sulfur on the fiber into water-soluble sulfide and remove it. The desulfurizer contains NaOH, Na2S and other ingredients. In order to achieve the purpose of reusing the desulfurization liquid, existing desulfurization equipment mostly adopts a circulating barrel to adjust the concentration of the desulfurization liquid, receive the reflux liquid after viscose fiber desulfurization, and intermittently discharge part of the reflux liquid from the bottom of the circulating barrel to reduce the loss of desulfurization liquid. However, this desulfurization method of intermittently discharging part of the reflux liquid from the bottom of the circulating barrel still has the problem of excessive loss of desulfurization liquid (i.e., excessive alkali consumption). In addition, existing desulfurization technologies mostly use a leaching tank to receive the prepared desulfurization liquid, and allow the desulfurization liquid to flow from both sides of the leaching tank to the fiber surface and return to the circulation barrel from the fiber bottom layer. However, this process of only using double-sided leaching often has problems such as slow flow rate and difficulty for the desulfurization liquid to quickly penetrate into the fiber layer, resulting in poor desulfurization effect.
[0004] Therefore, it has become an urgent task to provide a desulfurization device for viscose fiber post-treatment that has a simple structure, good desulfurization effect, and can effectively reduce the loss of desulfurization liquid. Utility Model Content
[0005] In order to overcome the shortcoming of excessive desulfurization liquid loss in existing desulfurization devices, the utility model provides a desulfurization device for viscose fiber post-processing, which is provided with a circulation barrel and multiple desulfurization stations. Each desulfurization station is provided with a corresponding pressing roller, a rinsing tank and a liquid receiving tank. A corresponding return liquid branch pipe is provided under each liquid receiving tank, and a return liquid main pipe, a second drain pipe and a control valve are provided. The ratio of the discharge volume of the second drain pipe to the desulfurization return liquid volume flowing into the circulation barrel can be controlled to not exceed 5%. The utility model has the advantages of simple structure, good desulfurization effect and can effectively reduce the loss of desulfurization liquid.
[0006] The technical solution of the utility model is as follows:
[0007] A desulfurization device for post-processing of viscose fiber, comprising a rinsing device, a viscose fiber conveying device, a desulfurization liquid recovery pipeline, a circulation barrel, a desulfurization liquid conveying pipeline, a feeding pipeline, an overflow pipe, a first liquid discharge pipe, a liquid receiving tank and a waste liquid collection tank, wherein the viscose fiber conveying device comprises a conveyor belt for conveying viscose fiber, the rinsing device and the liquid receiving tank are respectively arranged above and below the conveyor belt; one end of the desulfurization liquid conveying pipeline is connected to the first liquid outlet of the circulation barrel arranged at the bottom of the circulation barrel, and the other end is connected to the rinsing device; one end of the overflow pipe is connected to the overflow port of the circulation barrel arranged on the upper part of the side wall of the circulation barrel, and the other end is connected to the waste liquid collection tank; one end of the feeding pipeline is connected to the liquid inlet of the circulation barrel arranged at the top of the circulation barrel, and the other end is connected to the external storage tank; one end of the first liquid discharge pipe is connected to the second liquid outlet of the circulation barrel arranged at the bottom of the circulation barrel, and the other end is connected to the waste liquid collection tank;
[0008] The viscose fiber conveying device further includes a plurality of pairs of pressing rollers spaced apart along the transmission direction of the conveyor belt, wherein the central axis of the rotating shaft of each pressing roller is horizontally arranged and perpendicular to the transmission direction of the conveyor belt; the desulfurization section between two adjacent pairs of pressing rollers is a desulfurization station, and the number of desulfurization stations is at least 3. The conveyor belt passes through the middle of each desulfurization station in sequence along the horizontal direction, and each pair of pressing rollers is respectively closely arranged at relative positions above and below the conveyor belt to crush and deliquify the viscose fibers laid on the conveyor belt, wherein the pair of pressing rollers that first crush the viscose fibers is the front pressing roller, and the pair of pressing rollers that crush the viscose fibers later is the rear pressing roller;
[0009] The elution device includes a plurality of elution tanks arranged in sequence and at intervals above the conveyor belt along the conveying direction of the conveyor belt; each desulfurization station includes an elution tank and a liquid receiving tank arranged below the elution tank to recover the reflux liquid;
[0010] The desulfurization device for post-processing of viscose fiber also includes a return liquid main pipe, a second liquid discharge pipe and multiple return liquid branch pipes; the return liquid main pipe is arranged below each desulfurization station and extends along the transmission direction of the conveyor belt, and each liquid receiving tank is connected to the return liquid main pipe through a corresponding return liquid branch pipe. One end of the second liquid discharge pipe is connected to the return liquid main pipe and the position where the two are connected corresponds to the first desulfurization station, and the other end is connected to the waste liquid collection tank. A control valve for controlling pipeline circulation is provided on the second liquid discharge pipe; one end of the desulfurization liquid recovery pipeline is connected to the return liquid main pipe, and the other end is connected to the circulation barrel liquid inlet arranged at the top of the circulation barrel.
[0011] The desulfurization device for viscose fiber post-processing of the present application is equipped with a circulation barrel and multiple desulfurization stations. Each desulfurization station is equipped with a corresponding pressure roller, a rinsing tank, and a liquid receiving tank. A corresponding return liquid branch is provided below each liquid receiving tank. A return liquid main pipe, a second liquid discharge pipe, and a control valve are also provided. The ratio of the discharge volume of the second liquid discharge pipe to the desulfurization return liquid volume flowing into the circulation barrel can be controlled to not exceed 5%. It has the advantages of simple structure, good desulfurization effect, and can effectively reduce desulfurization liquid loss. It solves the problem of excessive desulfurization liquid loss in existing desulfurization devices for viscose fiber post-processing. If the ratio of the discharge volume of the second liquid discharge pipe to the desulfurization return liquid volume flowing into the circulation barrel is too high, it will lead to increased alkali consumption. This application uses a return liquid main pipe, a second liquid discharge pipe, a control valve, and multiple return liquid branches to discharge part of the reflux liquid (low alkali concentration) from the first desulfurization station, thereby reducing the amount of desulfurization liquid discharged from the circulation tank (high alkali concentration), thereby reducing the amount of alkali liquid added to the circulation tank and achieving the purpose of reducing desulfurization liquid loss (i.e., alkali loss). The provision of an overflow pipe can effectively prevent the liquid level in the circulation tank from being too high. The specific working principle is as follows:
[0012] The feed pipe ensures that the alkali concentration of the desulfurization liquid in the drum remains within the process control range. The desulfurization liquid in the circulation drum is heated to the specified desulfurization temperature using a steam spray heating method and then transported to the leaching tank via the desulfurization liquid delivery pipe. A conveyor belt drives the viscose fiber through each desulfurization station. At each desulfurization station, the desulfurization liquid flows from the leaching tank to rinse and desulfurize the viscose fiber. It is then rolled and desulfurized by rollers before entering the next desulfurization station. The reflux from each desulfurization station is collected in its own receiving tank and fed into the return liquid main. A control valve is opened to discharge a portion of the reflux from the first desulfurization station into the waste liquid collection tank. The ratio of the discharge volume from the second discharge pipe to the desulfurization return liquid flowing into the circulation drum is controlled to no more than 5%. The remaining reflux is returned to the circulation drum for reuse and feed. After the desulfurization liquid has been circulated for a certain period of time, if the liquid level in the circulation barrel exceeds the process control level, the liquid at the bottom of the circulation barrel will be discharged to the waste liquid collection tank through the first drain pipe. If the liquid level in the circulation barrel exceeds the overflow level, the desulfurization liquid in the barrel will overflow into the waste liquid collection tank through the overflow pipe. The first drain pipe has an intermittent discharge method, while the second drain pipe has a continuous discharge method.
[0013] There are at least two leaching tanks on each desulfurization station, and the leaching tanks are arranged at intervals. Each leaching tank extends in a direction parallel to the extension direction of the pressure roller axis. One of the leaching tanks is arranged close to the front pressure roller of the desulfurization station, and the notch on the top of the leaching tank is inclined toward the front pressure roller so that the desulfurization liquid in the tank can be flushed to the roller surface of the front pressure roller. The top heights of the two side walls of the remaining leaching tanks extending in the direction parallel to the extension direction of the pressure roller axis are consistent.
[0014] Each desulfurization station is equipped with at least two leaching tanks. The leaching tank close to the front pressure roller of the same desulfurization station is in an inclined state, which is conducive to increasing the liquid elution flow rate of the desulfurization liquid, accelerating the penetration of the desulfurization liquid into the fiber layer, and flushing the surface of the pressure roller, avoiding short fibers from sticking to the surface of the pressure roller. The other leaching tanks are in a horizontal state and are arranged at intervals, which is conducive to expanding the elution area of the fiber layer and improving the uniformity of fiber desulfurization.
[0015] The tilt angle θ of the leaching tank close to the front pressure roller of the same desulfurization station is 10-15°.
[0016] The preferred tilt angle makes the desulfurization effect of the fiber optimal.
[0017] The tops of both side walls of each elution tank extending in parallel to the extending direction of the rotation axis of the pressing roller are both serrated structures.
[0018] The serrated design of the rinsing tank side wall is conducive to uniform rinsing and improves the rinsing effect.
[0019] A liquid receiving port is provided in the middle of the bottom plate of each liquid receiving tank, on which a filter plate for filtering the desulfurized liquid is installed, with a plurality of small holes spaced apart on the filter plate; one end of the corresponding liquid return branch pipe is connected below the liquid receiving port of each liquid receiving tank.
[0020] The setting of the filter plate helps to prevent foreign matter from entering the return liquid branch pipe.
[0021] The diameter of the small hole is 2-4 mm.
[0022] The preferred pore diameter enables short fibers to be intercepted and filtered.
[0023] A pipeline filter is also installed on the desulfurization liquid delivery pipeline.
[0024] The setting of pipeline filter can reduce the mixing of foreign matter into the finished fiber.
[0025] The feed pipeline includes a concentrated alkali feed pipeline and a soft water feed pipeline, and the external storage tank includes an external concentrated alkali storage tank and an external soft water storage tank. One end of the concentrated alkali feed pipeline and the soft water feed pipeline are connected to the circulation barrel liquid inlet located on the top of the circulation barrel, and the other end are connected to the external concentrated alkali storage tank and the external soft water storage tank respectively. Control valves are installed on the concentrated alkali feed pipeline and the soft water feed pipeline.
[0026] The alkali concentration in the desulfurization liquid can be adjusted by supplying concentrated alkali and soft water to meet the reuse standards.
[0027] The desulfurization device for post-processing of viscose fiber also includes a waste alkali replenishing pipeline, one end of which is connected to an external waste alkali storage tank, and the other end is connected to the circulating barrel liquid inlet located on the top of the circulating barrel. The waste alkali replenishing pipeline is installed with a control valve.
[0028] The waste alkali replenishment pipeline is set up so that the OH - 、S 2 - The waste alkali is reused, which enhances the desulfurization effect, is more environmentally friendly and saves costs.
[0029] Compared with the prior art, the utility model application has the following advantages:
[0030] 1) The desulfurization device for post-processing of viscose fibers of the present application is provided with multiple desulfurization stations, and corresponding pressing rollers, leaching tanks, and liquid receiving tanks are provided in each desulfurization station. A return liquid main pipe, a second liquid discharge pipe, a control valve, and multiple return liquid branches are provided to cooperate with each other, and the ratio of the discharge volume of the second liquid discharge pipe to the desulfurization return liquid volume flowing into the circulation tank can be controlled to not exceed 5%. It has the advantages of simple structure, good desulfurization effect, and can effectively reduce the loss of desulfurization liquid;
[0031] 2) Each desulfurization station is equipped with at least two leaching tanks. The leaching tank close to the preceding press roller of the same desulfurization station is in an inclined state, which is conducive to increasing the elution flow rate of the desulfurization liquid, accelerating the penetration of the desulfurization liquid into the fiber layer, and flushing the surface of the press roller, thereby preventing short fibers from sticking to the surface of the press roller. The other leaching tanks are in a horizontal state and spaced apart, which is conducive to expanding the elution area of the fiber layer and improving the uniformity of fiber desulfurization.
[0032] 3) The optimal tilt angle makes the desulfurization effect of the fiber optimal;
[0033] 4) The installation of filter plates and pipeline filters can reduce the amount of foreign matter in the desulfurization liquid, which is beneficial to improving the cleanliness of the product;
[0034] 5) The serrated design of the leaching tank side wall is conducive to uniform leaching and improves the leaching effect;
[0035] 6) The waste alkali replenishment pipeline is set up so that the OH - 、S 2 - The waste alkali is reused, which enhances the desulfurization effect, is more environmentally friendly and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] Figure 1 This is a schematic structural diagram of a desulfurization device for post-processing viscose fibers according to the present invention;
[0037] Figure 2 This is a left view / right view of the leaching tank of the desulfurization device for post-treatment of viscose fibers described in the present invention;
[0038] Figure 3 This is a top view of the liquid receiving tank of the desulfurization device for post-treatment of viscose fibers according to the present invention;
[0039] Figure 4 The utility model is a desulfurization device for viscose fiber post-processing Figure 3 A partial enlarged view of .
[0040] Description of labels:
[0041] Desulfurization liquid recovery pipeline 1, circulation barrel 2, desulfurization liquid delivery pipeline 3, overflow pipe 4, first drainage pipe 5, waste liquid collection tank 6, liquid receiving tank 7, conveyor belt 8, pressure roller 9, desulfurization station 10, return liquid main pipe 11, second drainage pipe 12, return liquid branch pipe 13, leaching tank 14, filter plate 15, pipeline filter 16, concentrated alkali replenishment pipeline 17, soft water replenishment pipeline 18, waste alkali replenishment pipeline 19, circulation barrel first liquid outlet 2-1, circulation barrel overflow port 2-2, circulation barrel liquid inlet 2-3, circulation barrel second liquid outlet 2-4, liquid receiving port 7-1, small hole 15-1. DETAILED DESCRIPTION
[0042] The technical solution of the present invention will be described clearly and completely below with reference to the accompanying drawings.
[0043] like Figure 1-4 As shown, the desulfurization device for post-processing of viscose fiber described in the present invention includes a rinsing device, a viscose fiber conveying device, a desulfurization liquid recovery pipeline 1, a circulation barrel 2, a desulfurization liquid conveying pipeline 3, a feeding pipeline, an overflow pipe 4, a first drain pipe 5, a liquid receiving tank 7 and a waste liquid collection tank 6. The viscose fiber conveying device includes a conveyor belt 8 for conveying viscose fiber, and the rinsing device and the liquid receiving tank 7 are respectively arranged above and below the conveyor belt 8; one end of the desulfurization liquid conveying pipeline 3 is connected to the first liquid outlet 2-1 of the circulation barrel at the bottom of the circulation barrel 2, and the other end is connected to the rinsing device; one end of the overflow pipe 4 is connected to the circulation barrel overflow port 2-2 provided on the upper part of the side wall of the circulation barrel 2, and the other end is connected to the waste liquid collection tank 6; one end of the feeding pipeline is connected to the circulation barrel liquid inlet 2-3 provided on the top of the circulation barrel 2, and the other end is connected to the external storage tank; one end of the first drain pipe 5 is connected to the second liquid outlet 2-4 of the circulation barrel at the bottom of the circulation barrel 2, and the other end is connected to the waste liquid collection tank 6;
[0044] The viscose fiber conveying device further includes a plurality of pairs of pressing rollers 9 spaced apart along the transmission direction of the conveyor belt 8, wherein the central axis of the rotating shaft of each pressing roller 9 is horizontally arranged and perpendicular to the transmission direction of the conveyor belt 8; the desulfurization section between two adjacent pairs of pressing rollers is a desulfurization station 10, and the number of desulfurization stations 10 is at least 3, and the conveyor belt 8 passes through the middle of each desulfurization station 10 in sequence along the horizontal direction. Each pair of pressing rollers 9 is respectively arranged in close proximity to the relative positions above and below the conveyor belt 8 to crush and deliquify the viscose fibers laid on the conveyor belt 8, wherein the pair of pressing rollers 9 that first crush the viscose fibers are called front pressing rollers, and the pair of pressing rollers 9 that crush the viscose fibers later are called rear pressing rollers;
[0045] The elution device includes a plurality of elution tanks 14 arranged in sequence and spaced apart above the conveyor belt 8 along the conveying direction of the conveyor belt 8; each desulfurization station 10 includes an elution tank 14 and a liquid receiving tank 7 arranged below the elution tank to recover the reflux liquid;
[0046] The desulfurization device for post-processing of viscose fiber also includes a return liquid main pipe 11, a second liquid discharge pipe 12 and multiple return liquid branch pipes 13; the return liquid main pipe 11 is arranged below each desulfurization station 10 and extends along the transmission direction of the conveyor belt 8, and each liquid receiving tank 7 is connected to the return liquid main pipe 11 through a corresponding return liquid branch pipe 13, one end of the second liquid discharge pipe 12 is connected to the return liquid main pipe 11 and the position where the two are connected corresponds to the first desulfurization station 10, and the other end is connected to the waste liquid collection tank 6, and a control valve for controlling pipeline circulation is provided on the second liquid discharge pipe 12; one end of the desulfurization liquid recovery pipeline 1 is connected to the return liquid main pipe 11, and the other end is connected to the circulation barrel liquid inlet 2-3 arranged at the top of the circulation barrel 2.
[0047] There are at least two leaching tanks 14 on each desulfurization station 10, and the leaching tanks are arranged at intervals. Each leaching tank 14 extends in a direction parallel to the extension direction of the rotation axis of the pressure roller 9. One of the leaching tanks 14 is arranged close to the front pressure roller 9 of the desulfurization station 10, and the notch on the top of the leaching tank 14 is inclined toward the front pressure roller 9 so that the desulfurization liquid in the tank can be flushed to the roller surface of the front pressure roller 9. The top heights of the two side walls of the remaining leaching tanks 14 extending in a direction parallel to the extension direction of the rotation axis of the pressure roller 9 are consistent.
[0048] The tilt angle θ of the leaching tank 14 close to the front pressure roller 9 of the desulfurization station 10 is 10-15°.
[0049] The tops of both side walls of each elution tank 14 extending in parallel to the extending direction of the rotation axis of the pressing roller 9 are both serrated structures.
[0050] A liquid receiving port 7-1 is provided in the middle of the bottom plate of each liquid receiving tank 7, and a filter plate 15 for filtering the desulfurized liquid is installed on the liquid receiving port 7-1. The filter plate 15 has multiple small holes 15-1 distributed at intervals; one end of the corresponding liquid return branch pipe 13 is connected below the liquid receiving port 7-1 of each liquid receiving tank 7.
[0051] The diameter of the small hole 15-1 is 2-4 mm.
[0052] A pipeline filter 16 is also installed on the desulfurization liquid delivery pipeline 3.
[0053] The feed pipeline includes a concentrated alkali feed pipeline 17 and a soft water feed pipeline 18, and the external storage tank includes an external concentrated alkali storage tank and an external soft water storage tank. One end of the concentrated alkali feed pipeline 17 and the soft water feed pipeline 18 are connected to the circulation barrel liquid inlet 2-3 located at the top of the circulation barrel 2, and the other end is connected to the external concentrated alkali storage tank and the external soft water storage tank respectively. Control valves are installed on the concentrated alkali feed pipeline 17 and the soft water feed pipeline 18.
[0054] The desulfurization device for post-processing of viscose fiber also includes a waste alkali replenishing pipe 19, one end of which is connected to an external waste alkali storage tank, and the other end is connected to the circulating barrel liquid inlet 2-3 located on the top of the circulating barrel 2. The waste alkali replenishing pipe 19 is installed with a control valve.
Claims
1. A desulfurization device for post-processing viscose fibers, comprising a rinsing device, a viscose fiber conveying device, a desulfurization liquid recovery pipeline (1), a circulation barrel (2), a desulfurization liquid conveying pipeline (3), a feeding pipeline, an overflow pipe (4), a first liquid discharge pipe (5), a liquid receiving tank (7), and a waste liquid collection tank (6), wherein the viscose fiber conveying device comprises a conveyor belt (8) for conveying viscose fibers, the rinsing device and the liquid receiving tank (7) are respectively arranged above and below the conveyor belt (8); one end of the desulfurization liquid conveying pipeline (3) is connected to the circulation barrel. (2) The first liquid outlet (2-1) of the circulation barrel at the bottom, and the other end is connected to the rinsing device; one end of the overflow pipe (4) is connected to the circulation barrel overflow port (2-2) provided on the upper part of the side wall of the circulation barrel (2), and the other end is connected to the waste liquid collection tank (6); one end of the feed pipe is connected to the circulation barrel liquid inlet (2-3) provided on the top of the circulation barrel (2), and the other end is connected to the external storage tank; one end of the first drain pipe (5) is connected to the second liquid outlet (2-4) of the circulation barrel provided on the bottom of the circulation barrel (2), and the other end is connected to the waste liquid collection tank (6); Its characteristics are: The viscose fiber conveying device further comprises a plurality of pairs of pressure rollers (9) spaced apart along the transmission direction of the conveyor belt (8), wherein the central axis of the rotating shaft of each pressure roller (9) is horizontally arranged and perpendicular to the transmission direction of the conveyor belt (8); the desulfurization section between the two pairs of pressure rollers adjacent to each other is a desulfurization station (10), and the number of the desulfurization stations (10) is at least 3, and the conveyor belt (8) passes through the middle of each desulfurization station (10) in sequence along the horizontal direction, and each pair of pressure rollers (9) is respectively closely arranged at relative positions above and below the conveyor belt (8) to crush and deliquify the viscose fibers laid on the conveyor belt (8), wherein the pair of pressure rollers (9) that first crush the viscose fibers are front pressure rollers, and the pair of pressure rollers (9) that crush the viscose fibers later are rear pressure rollers; The elution device comprises a plurality of elution tanks (14) arranged in sequence and at intervals above the conveyor belt (8) along the conveying direction of the conveyor belt (8); each desulfurization station (10) comprises an elution tank (14) and a liquid receiving tank (7) arranged below the elution tank to recover the reflux liquid; The desulfurization device for post-processing of viscose fibers further comprises a return liquid main pipe (11), a second liquid discharge pipe (12) and a plurality of return liquid branch pipes (13); the return liquid main pipe (11) is arranged below each desulfurization station (10) and extends along the transmission direction of the conveyor belt (8); each liquid receiving tank (7) is connected to the return liquid main pipe (11) through a corresponding return liquid branch pipe (13); one end of the second liquid discharge pipe (12) is connected to the return liquid main pipe (11) and the position where the two are connected corresponds to the first desulfurization station (10); the other end is connected to the waste liquid collection tank (6); a control valve for controlling pipeline circulation is provided on the second liquid discharge pipe (12); one end of the desulfurization liquid recovery pipe (1) is connected to the return liquid main pipe (11), and the other end is connected to the circulation barrel liquid inlet (2-3) arranged at the top of the circulation barrel (2).
2. The desulfurization device for post-processing of viscose fibers according to claim 1, characterized in that: The number of leaching tanks (14) on each desulfurization station (10) is at least 2, and the leaching tanks are arranged at intervals. Each leaching tank (14) extends in a direction parallel to the extension direction of the rotation axis of the pressure roller (9). One of the leaching tanks (14) is arranged close to the front pressure roller (9) of the desulfurization station (10), and the notch on the top of the leaching tank (14) is inclined toward the front pressure roller (9) so that the desulfurization liquid in the tank is flushed to the roller surface of the front pressure roller (9). The top heights of the two side walls of the remaining leaching tanks (14) extending in a direction parallel to the extension direction of the rotation axis of the pressure roller (9) are consistent.
3. The desulfurization device for post-processing of viscose fibers according to claim 2, characterized in that: The tilt angle θ of the leaching tank (14) close to the front pressure roller (9) of the same desulfurization station (10) is 10-15 degrees.
4. The desulfurization device for post-processing of viscose fibers according to claim 2, characterized in that: The tops of both side walls of each elution tank (14) extending in parallel to the extension direction of the rotation axis of the pressing roller (9) are both serrated structures.
5. The desulfurization device for post-processing of viscose fibers according to claim 1, characterized in that: A liquid receiving port (7-1) is provided in the middle of the bottom plate of each liquid receiving tank (7), and a filter plate (15) for filtering the desulfurized liquid is installed on the liquid receiving port (7-1), wherein a plurality of small holes (15-1) are distributed at intervals on the filter plate (15); one end of the corresponding liquid return branch pipe (13) is connected below the liquid receiving port (7-1) of each liquid receiving tank (7).
6. The desulfurization device for post-treatment of viscose fibers according to claim 5, characterized in that: The diameter of the small hole (15-1) is 2-4 mm.
7. The desulfurization device for post-processing of viscose fibers according to claim 1, characterized in that: A pipeline filter (16) is also installed on the desulfurization liquid delivery pipeline (3).
8. The desulfurization device for post-processing of viscose fibers according to claim 1, characterized in that: The feed pipe includes a concentrated alkali feed pipe (17) and a soft water feed pipe (18), and the external storage tank includes an external concentrated alkali storage tank and an external soft water storage tank. One end of the concentrated alkali feed pipe (17) and the soft water feed pipe (18) are connected to the circulation barrel liquid inlet (2-3) provided on the top of the circulation barrel (2), and the other end is connected to the external concentrated alkali storage tank and the external soft water storage tank respectively. Control valves are installed on the concentrated alkali feed pipe (17) and the soft water feed pipe (18).
9. The desulfurization device for post-processing of viscose fibers according to claim 1, characterized in that: The desulfurization device for post-treatment of viscose fibers further comprises a waste alkali replenishing pipeline (19), one end of which is connected to an external waste alkali storage tank, and the other end of which is connected to a circulating barrel liquid inlet (2-3) provided on the top of the circulating barrel (2). The waste alkali replenishing pipeline (19) is provided with a control valve.