A viscose fiber acid bath micro-porous filter backwashing system

Abstract

The utility model discloses viscose fibre acid bath micropore filter backwash system relates to viscose fibre production technical field, including micropore filter, controller, the top export of micropore filter is connected with acid outlet pipeline, water inlet pipeline, air inlet pipeline and alkali discharge pipeline respectively, and the bottom export is connected with acid inlet pipeline, alkali inlet pipeline, acid drainage pipeline and blow-off pipeline respectively, acid outlet pipeline, water inlet pipeline, air inlet pipeline, alkali discharge pipeline, acid inlet pipeline, alkali inlet pipeline, acid drainage pipeline and blow-off pipeline are provided with electric valve respectively, and acid outlet pipeline and blow-off pipeline are provided with turbidimeter respectively, and acid drainage pipeline and alkali inlet pipeline are provided with flowmeter respectively, electric valve, turbidimeter and flowmeter are connected with controller signal respectively. Through setting PLC controller and sensor, change micropore filter cleaning process to automatic control, set safety interlock, optimize and upgrade micropore cleaning process, reduce personnel safety risk, improve micropore cleaning efficiency.

Description

Technical Field

[0001] This utility model relates to the field of viscose fiber production technology, and in particular to a backwashing system for a viscose fiber acid bath microporous filter. Background Technology

[0002] Currently, microporous filters are one of the main equipment in acid production stations for filtering acid baths. Their main function is to filter diluted and impurity-laden waste acid from spinning plants, removing impurities such as acid sludge from the waste acid. The filtered acid is then pumped into a high-level tank for further evaporation. Once the acid bath meets the process requirements, it is supplied to spinning plants again, and so on.

[0003] Because the microporous filter is constantly in operation, impurities such as acid sludge gradually adhere to the inner wall of the microporous tube, significantly reducing its filtration efficiency. Therefore, each microporous filter needs to be cleaned periodically. The cleaning cycle for large microporous filters is approximately 7-8 days, and for small microporous filters, it's approximately 12-13 days, requiring daily cleaning. During cleaning, the bottom cover of the microporous filter must be opened, and water and compressed air are used to flush out the acid sludge remaining inside the filter. The flushed-out acid sludge and other impurities are directly discharged onto the second-floor floor, causing a severe release of hydrogen sulfide odor and resulting in poor environmental hygiene.

[0004] Due to the large amount of hydrogen sulfide gas released by the current microporous backwashing process, the on-site odor is severe, which is not only detrimental to the health of employees, but also poses a huge challenge to the environment. In order to protect the physical and mental health of employees and effectively control the environmental problem of fugitive hydrogen sulfide release, the improvement of the microporous backwashing process is imperative.

[0005] The current micropore backwashing process is as follows: ① Close the inlet and outlet acid valves of the micropores that need backwashing, and open the acid draining valve to drain the acid. ② After the acid draining is completed, remove the inlet blind plate, close the acid draining valve, and open the micropore bottom cover. ③ Open the inlet valve, press it with compressed air 2-3 times, then close the inlet valve and install the micropore bottom cover. ④ Remove the alkali blind plate, open the inlet (draining) alkali valve, open the alkali outlet valve and alkali outlet pump of the alkali tank, and let the micropores soak in alkali solution until they are full of alkali solution. Circulate the solution to the circulating alkali tank on the first floor for 2-3 hours. After circulation, close the alkali draining valve, close the alkali pump and alkali outlet valve, plug the alkali blind plate, and soak in alkali solution for 8 hours. ⑤ After soaking, open the alkali draining valve. After the alkali solution is discharged to the circulating alkali tank on the first floor, close the inlet (draining) alkali valve. ⑥ After the alkali draining is completed, remove the inlet blind plate, open the micropore bottom cover, open the inlet valve, press it with compressed air 2-3 times, then close the inlet valve, plug the inlet blind plate, and install the micropore bottom cover. Backwashing is complete. ⑦ Open the inlet and outlet acid valves to start acid filtration.

[0006] The current microporous backwashing process results in a severe odor from the release of hydrogen sulfide on-site, posing a high safety risk to employees. During the backwashing process, it is necessary to frequently remove and plug blind flanges, dismantle and install microporous bottom covers, leading to high wear and tear on hardware and materials and multiple leakage issues. Furthermore, wastewater is directly discharged to the second-floor ground during the backwashing process, resulting in a poor on-site environment and significant environmental pressure. Utility Model Content

[0007] This utility model aims to provide a backwashing system for viscose fiber acid bath microporous filters. By setting up a PLC controller and sensors, the microporous filter cleaning process is transformed into automated control, safety interlocks are set up, the microporous cleaning process is optimized and upgraded, personnel safety risks are reduced, and microporous cleaning efficiency is improved.

[0008] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows:

[0009] A backwashing system for a viscose fiber acid bath microporous filter includes a microporous filter and a controller. The microporous filter has a top outlet at the top and a bottom outlet on the side. The top outlet is connected to an acid outlet pipe, a water inlet pipe, an air inlet pipe, and an alkali discharge pipe.

[0010] The bottom outlet is connected to an acid inlet pipe, an alkali inlet pipe, an acid-leaching pipe, and a sewage outlet pipe, respectively. Each of these pipes—acid outlet, water inlet, air inlet, alkali outlet, acid inlet, alkali inlet, acid-leaching pipe, and sewage outlet—is equipped with an electric valve.

[0011] The acid outlet pipe and sewage discharge pipe are each equipped with a turbidity meter, and the acid leaching pipe and alkali inlet pipe are each equipped with a flow meter. The electric valve, turbidity meter and flow meter are respectively connected to the controller signal.

[0012] The valve core of the electric valve is made of polytetrafluoroethylene.

[0013] The alkali inlet pipe and alkali outlet pipe are respectively connected to the alkali tank. The alkali inlet pipe is connected to the alkali tank outlet, and the alkali outlet pipe is connected to the alkali tank inlet. An alkali pump is installed on the alkali inlet pipe.

[0014] The sewage pipe is equipped with a gas-water separator. The gas outlet of the gas-water separator is connected to the exhaust gas treatment device, and the water outlet of the gas-water separator is connected to the sewage treatment device.

[0015] The exhaust gas treatment device includes a spinning duct, an alkaline spray tank, and an exhaust tower connected in sequence. It is connected to the main spinning duct and enters the alkaline spray treatment along with the spinning exhaust gas. The alkaline spray uses alkaline solution to reduce the content of hydrogen sulfide and carbon disulfide in the exhaust gas. The treated gas that meets the standards is discharged into the atmosphere in an organized manner through the exhaust tower.

[0016] The acid-leaching pipe is connected to a low-level tank I, the acid inlet pipe is connected to a low-level tank II, and an acid pump is installed on the acid inlet pipe; the acid outlet pipe is connected to a high-level tank.

[0017] The acid-leaching pipe, sewage pipe, water inlet pipe, and air inlet pipe are each equipped with a vent valve. The vent valve of the sewage pipe is located on the connecting pipe between the outlet of the steam-water separator and the sewage treatment device.

[0018] The beneficial effects of this utility model are:

[0019] 1. This utility model is based on the linkage of a turbidity meter, a flow meter and a controller to realize unmanned operation of the entire process from detection, acid leaching, alkaline washing, soaking to rinsing, avoiding human operation errors and greatly shortening the cleaning cycle.

[0020] 2. This utility model, by dynamically monitoring acid turbidity to trigger cleaning, ensures stable acid bath filtration quality and significantly improves the qualified rate of viscose fiber production.

[0021] 3. This utility model achieves intelligent management of efficient cleaning, resource saving, safety interlock alarms, and production continuity by automating the backwashing process of the acid bath microporous filter, combined with real-time monitoring of turbidity and flow rate and valve linkage, which significantly improves the production quality of viscose fiber and the operating efficiency of equipment.

[0022] 4. In this utility model, the automatic and unmanned operation reduces the risk of hydrogen sulfide poisoning, acid and alkali burns to employees, protects their physical and mental health, and reduces safety risks. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the backwashing system of the viscose fiber acid bath microporous filter of this utility model.

[0024] Figure 2 This is a schematic diagram of the backwashing system of the viscose fiber acid bath microporous filter of this utility model.

[0025] The components include: 1. Microporous filter; 2. Top outlet; 3. Bottom outlet; 4. Acid outlet pipe; 5. Water inlet pipe; 6. Air inlet pipe; 7. Alkali discharge pipe; 8. Acid inlet pipe; 9. Alkali inlet pipe; 10. Acid leaching pipe; 11. Sewage discharge pipe; 12. Turbidity meter; 13. Flow meter; 14. Alkali pump; 15. Alkali tank; 16. Gas-water separator; 17. Spinning air duct; 18. Alkali spray tank; 19. Exhaust tower; 20. Low-level tank I; 21. Low-level tank II; 22. Acid pump; 23. High-level tank; 24. Vent valve. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0027] Example 1

[0028] This embodiment provides a method such as Figure 1The viscose fiber acid bath microporous filter backwashing system shown includes a microporous filter 1 and a controller. The microporous filter 1 has a top outlet 2 at the top and a bottom outlet 3 on the bottom side. The top outlet 2 is connected to an acid outlet pipe 4, a water inlet pipe 5, an air inlet pipe 6, and an alkali discharge pipe 7.

[0029] Bottom outlet 3 is connected to acid inlet pipe 8, alkali inlet pipe 9, acid leaching pipe 10, and sewage outlet pipe 11. Each of the acid outlet pipe 4, water inlet pipe 5, air inlet pipe 6, alkali outlet pipe 7, acid inlet pipe 8, alkali inlet pipe 9, acid leaching pipe 10, and sewage outlet pipe 11 is equipped with an electric valve.

[0030] The acid outlet pipe 4 and the sewage outlet pipe 11 are respectively equipped with turbidity meters 12, and the acid leaching pipe 10 and the alkali inlet pipe 9 are respectively equipped with flow meters 13. The electric valve, turbidity meter 12 and flow meter 13 are respectively connected to the controller signal.

[0031] In this embodiment, the turbidity meter 12 is an online real-time monitoring turbidity meter (WZT-701); the flow meter 13 is a YYD electromagnetic flow meter; the electric valve is a ZAZQ type electric three-way regulating valve; and the controller is a PLC Siemens series controller.

[0032] In this embodiment, as Figure 2 As shown, the automatic cleaning of the viscose fiber acid bath microporous filter is completed through the following steps:

[0033] S1. The controller monitors the turbidity of the acid bath after filtration by the microporous filter 1 in real time through the turbidity meter 12 on the acid outlet pipe 4. The turbidity meter 12 transmits the turbidity of the filtered acid bath to the controller in real time. The controller compares the turbidity data with the preset value. When the turbidity meter 12 at the acid outlet pipe 4 detects that the acid bath turbidity is ≥20NTU, the controller controls the electric valves on the acid inlet pipe 8 and the acid outlet pipe 4 to close.

[0034] After the electric valves on S2, the acid pipe and the acid outlet pipe 4 are closed, the controller controls the electric valve on the acid draining pipe 10 to open and start the acid draining process. The controller monitors the flow rate of the acid in the acid draining pipe 10 through the flow meter 13. The flow meter 13 transmits the flow rate of the acid in the acid draining pipe 10 to the controller in real time. The controller compares the flow rate data with the preset value. When the reading of the flow meter 13 is <0.1 (m³ / h), the controller controls the solenoid valve on the acid draining pipe to close.

[0035] S3. After closing the solenoid valve on the acid-leaching pipe, the controller controls the electric valves on the alkali inlet pipe 9 and the alkali outlet pipe 7 to open. The alkali solution enters the microporous filter 1 from the bottom outlet through the alkali inlet pipe 9 and flows out from the top outlet through the alkali outlet pipe, starting the backwashing of the microporous filter 1 with the alkali solution.

[0036] S4. After 2 hours of alkali circulation, the controller closes the electric valve on the alkali inlet pipe 9. After the electric valve on the alkali inlet pipe 9 is closed for 10 seconds, the controller closes the electric valve on the alkali outlet pipe 7. The microporous filter 1 is then soaked in alkali solution for 6 hours.

[0037] S5. After soaking, the controller opens the electric valves on the alkali inlet pipe 9 and the alkali outlet pipe. The alkali solution flows out from the alkali inlet pipe 9 at the bottom outlet of the microporous filter 1 due to gravity, and the alkali leaching begins. The controller monitors the flow rate of alkali in the acid inlet pipe 8 through the flow meter 13. The flow meter 13 transmits the flow rate of alkali in the alkali inlet pipe 9 to the controller in real time. The controller compares the flow rate data with the preset value. When the reading of the flow meter 13 on the alkali inlet pipe 9 is <0.1 (m³ / h), the electric valves on the alkali inlet pipe 9 and the alkali outlet pipe are closed.

[0038] S6. After closing the electric valves on the alkali inlet pipe 9 and the alkali outlet pipe, the controller controls the electric valves on the water inlet pipe 5 and the sewage outlet pipe 11 to open. The controller controls the electric valve on the air inlet pipe 6 to open after 10 seconds to introduce compressed air. The controller controls the electric valve on the air inlet pipe 6 to open once every 10 seconds, with each valve opening time being 10 seconds. After three consecutive times, the controller controls the electric valves on the water inlet pipe 5 and the air inlet pipe 6 to close.

[0039] S7. The controller closes the electric valve of the sewage pipe 11 and opens the electric valve of the acid outlet pipe 4. After 10 seconds, the acid inlet valve is opened, and the micropore cleaning is completed.

[0040] S8. After cleaning, the controller monitors the turbidity of the acid bath filtered by the microporous filter 1 in real time through the turbidity meter 12 on the acid outlet pipe 4. The turbidity meter 12 transmits the turbidity of the filtered acid bath to the controller in real time. The controller compares the turbidity data with the preset value. When the reading displayed by the turbidity meter 12 at the acid outlet pipe 4 is still >20 NTU, the safety interlock is activated, the valves in and out of the acid outlet pipe 4 are automatically closed, and the alarm is started. If the valve opening is abnormal, all valves of the microporous filter 1 are closed in sequence, the alarm is started, and the situation is checked by on-site personnel.

[0041] This embodiment achieves intelligent management of efficient cleaning (alkali circulation + compressed air pulse backwash), resource saving (precise acid / alkali leaching), safety interlock alarms, and continuous production by automating the backwashing process of the acid bath microporous filter 1, combined with real-time monitoring of turbidity and flow rate and valve linkage. This significantly improves the production quality of viscose fiber and the operating efficiency of equipment.

[0042] The viscose fiber acid bath microporous filter backwashing system in this embodiment integrates real-time monitoring of turbidity and flow rate, electric valve linkage, and automated controller management to achieve dynamic control of acid bath filtration quality. Combined with precise acid / alkali leaching, alkali circulation-compressed air pulse backwashing, and safety interlock alarm functions, it ensures acid bath cleanliness while shortening the cleaning cycle, reducing alkali consumption, and minimizing wastewater discharge. Through seamless integration of the cleaning process with the production line, it significantly improves equipment operating efficiency and production continuity, achieving the goal of intelligent, low-consumption, and high-efficiency filtration system operation and maintenance.

[0043] Example 2

[0044] The difference between this embodiment and embodiment 1 is that, in this embodiment, the valve core of the electric valve is made of polytetrafluoroethylene.

[0045] The alkali inlet pipe 9 and the alkali outlet pipe are respectively connected to the alkali tank 15. The alkali inlet pipe 9 is connected to the outlet of the alkali tank 15, and the alkali outlet pipe is connected to the inlet of the alkali tank 15. An alkali pump 14 is installed on the alkali inlet pipe 9. The rest of the structure is the same as in Example 1.

[0046] In this embodiment, the electric valve made of polytetrafluoroethylene (PTFE) possesses corrosion resistance and high-temperature stability, and can withstand strong acid and alkali media. Combined with the low friction and self-lubricating properties of PTFE, it can effectively prevent scale buildup and jamming of the valve core, extend the service life of the electric valve, and ensure the long-term safe operation of the acid bath system. An alkali circulation pipeline is formed through the alkali inlet pipe 9, the alkali outlet pipe, and the alkali tank 15, which, in conjunction with the alkali pump 14, drives the alkali circulation, enabling the alkali to be recycled.

[0047] In this embodiment, during alkali circulation, the controller controls the electric valves on the alkali inlet pipe 9 and the alkali outlet pipe 7 to open. After the electric valves on the alkali inlet pipe 9 and the alkali outlet pipe 7 are opened, the controller controls the alkali pump 14 to start, which transports the alkali solution in the alkali tank 15 to the microporous filter 1, and then sends it back to the alkali tank 15 through the alkali outlet pipe of the microporous filter 1. The alkali inlet pipe 9, the alkali outlet pipe and the alkali tank 15 form an alkali circulation pipeline, which, together with the alkali pump 14, drives the alkali circulation to realize the alkali circulation and use.

[0048] After 2 hours of alkali circulation, the controller closes the electric valve on the alkali inlet pipe 9 and the alkali pump 14. After 10 seconds, the controller closes the electric valve on the alkali outlet pipe 7 and soaks the microporous filter 1 in alkali solution for 6 hours.

[0049] After soaking is completed, the controller opens the electric valves on the alkali inlet pipe 9 and the alkali outlet pipe, and closes the alkali pump 14. The alkali solution used to soak the microporous filter 1 flows into the alkali tank 15 through the alkali inlet pipe 9 to begin leaching. The controller monitors the flow rate of alkali in the acid inlet pipe 8 through the flow meter 13. The flow meter 13 transmits the flow rate of alkali in the alkali inlet pipe 9 to the controller in real time. The controller compares the flow rate data with the preset value. When the reading of the flow meter 13 on the alkali inlet pipe 9 is <0.1 (m³ / h), the electric valves on the alkali inlet pipe 9 and the alkali outlet pipe are closed.

[0050] Example 3

[0051] The difference between this embodiment and Embodiment 1 is that, in this embodiment, a gas-water separator 16 is installed on the sewage pipe 11. The gas outlet of the gas-water separator 16 is connected to the exhaust gas treatment device, and the water outlet of the gas-water separator 16 is connected to the sewage treatment device. The exhaust gas treatment device includes a spinning duct 17, an alkali spray tank 18, and a detoxification tower 19 connected end to end in sequence. The rest of the structure is the same as in Embodiment 1.

[0052] In this embodiment, by installing a gas-water separator 16 on the sewage pipe 11, the acidic sewage and hydrogen sulfide gas in the acidic sewage after backwashing are separated. The hydrogen sulfide gas is converted into sodium hydrosulfide in the gas purification section after alkaline spraying, which effectively solves the environmental protection problem, realizes recycling, and strives to achieve the goal of zero emissions from the acid station.

[0053] Example 4

[0054] Compared with Example 1, the difference in this embodiment is that, in this embodiment, the acid-leaching pipe 10 is connected to a low-level tank I 20, the acid inlet pipe 8 is connected to a low-level tank II 21, and an acid pump 22 is installed on the acid inlet pipe 8; the acid outlet pipe 4 is connected to a high-level tank 23.

[0055] The acid-leaching pipe 10, the sewage pipe 11, and the air inlet pipe 6 are each equipped with a vent valve 24. The vent valve 24 of the sewage pipe 11 is located on the connecting pipe between the outlet of the steam-water separator and the sewage treatment device. The rest of the structure is the same as in Embodiment 1.

[0056] In this embodiment, the low-level tank I20 serves as a storage container for the acid bath during acid leaching. Due to the high turbidity of the acid bath during leaching, the acid bath becomes cloudy. After leaching into the low-level tank I20, it can act as a sedimentation tank. The upper end of the tank is connected to the low-level tank II21. The clearer acid bath after sedimentation continues to be pumped into the low-level tank II21 for acid use. After cleaning, the acid bath in the low-level tank II21 is pumped into the microporous filter 1 for filtration using an acid pump. After filtration, it enters the high-level tank 23 as acid for evaporation in the evaporator. The vent valve 24 mainly functions to discharge excess media in various pipelines to prevent chemical reaction leaks and reduce safety risks.

[0057] Finally, it should be noted that the control methods of the viscose fiber acid bath microporous filter backwashing system involved in this utility model are all conventional selections for chemical equipment and process control, and can be conventionally selected according to different chemical equipment, devices, and control instruments.

[0058] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A backwashing system for a viscose fiber acid bath microporous filter, characterized in that: The microporous filter (1) includes a microporous filter (1) and a controller. The microporous filter (1) has a top outlet (2) at the top and a bottom outlet (3) on the bottom side. The top outlet (2) is connected to an acid outlet pipe (4), a water inlet pipe (5), an air inlet pipe (6), and an alkali discharge pipe (7). The bottom outlet (3) is connected to an acid inlet pipe (8), an alkali inlet pipe (9), an acid leaching pipe (10), and a sewage discharge pipe (11). The acid outlet pipe (4), water inlet pipe (5), air inlet pipe (6), alkali discharge pipe (7), acid inlet pipe (8), alkali inlet pipe (9), acid leaching pipe (10), and sewage discharge pipe (11) are each equipped with an electric valve. The acid outlet pipe (4) and sewage discharge pipe (11) are each equipped with a turbidity meter (12). The acid leaching pipe (10) and alkali inlet pipe (9) are each equipped with a flow meter (13). The electric valve, turbidity meter (12), and flow meter (13) are each connected to the controller signal.

2. The backwashing system for the viscose fiber acid bath microporous filter according to claim 1, characterized in that: The valve core of the electric valve is made of polytetrafluoroethylene.

3. The backwashing system for the viscose fiber acid bath microporous filter according to claim 1, characterized in that: The alkali inlet pipe (9) and alkali outlet pipe are respectively connected to the alkali tank (15). The alkali inlet pipe (9) is connected to the outlet of the alkali tank (15), and the alkali outlet pipe is connected to the inlet of the alkali tank (15). An alkali pump (14) is installed on the alkali inlet pipe (9).

4. The backwashing system for the viscose fiber acid bath microporous filter according to claim 1, characterized in that: A gas-water separator (16) is installed on the sewage pipe (11). The gas outlet of the gas-water separator (16) is connected to the exhaust gas treatment device, and the water outlet of the gas-water separator (16) is connected to the sewage treatment device.

5. The backwashing system for the viscose fiber acid bath microporous filter according to claim 4, characterized in that: The exhaust gas treatment device includes a spinning duct (17), an alkali spray tank (18), and a detoxification tower (19) connected end to end in sequence.

6. The backwashing system for the viscose fiber acid bath microporous filter according to claim 1, characterized in that: The acid-leaching pipe (10) is connected to a low-level tank I (20), the acid inlet pipe (8) is connected to a low-level tank II (21), and an acid pump (22) is installed on the acid inlet pipe (8); the acid outlet pipe (4) is connected to a high-level tank (23).

7. The backwashing system for the viscose fiber acid bath microporous filter according to claim 1, characterized in that: The acid leaching pipe (10), sewage pipe (11) and air inlet pipe (6) are each equipped with a vent valve (24). The vent valve (24) of the sewage pipe (11) is located on the connecting pipe between the outlet of the steam-water separator and the sewage treatment device.

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