CN112973212A - Method for cleaning filter element for viscose production - Google Patents
Method for cleaning filter element for viscose production Download PDFInfo
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- CN112973212A CN112973212A CN202110196763.8A CN202110196763A CN112973212A CN 112973212 A CN112973212 A CN 112973212A CN 202110196763 A CN202110196763 A CN 202110196763A CN 112973212 A CN112973212 A CN 112973212A
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- filter element
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- filter
- water
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- 238000004140 cleaning Methods 0.000 title claims abstract description 212
- 229920000297 Rayon Polymers 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000002253 acid Substances 0.000 claims abstract description 62
- 239000003513 alkali Substances 0.000 claims abstract description 32
- 239000007800 oxidant agent Substances 0.000 claims abstract description 17
- 238000002791 soaking Methods 0.000 claims abstract description 17
- 230000001590 oxidative effect Effects 0.000 claims abstract description 16
- 238000002386 leaching Methods 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims description 44
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 24
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 11
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 7
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 4
- 239000003518 caustics Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 238000009987 spinning Methods 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 8
- 238000001914 filtration Methods 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 30
- 208000012886 Vertigo Diseases 0.000 description 19
- 239000008234 soft water Substances 0.000 description 8
- 239000012752 auxiliary agent Substances 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000007654 immersion Methods 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 239000011550 stock solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- -1 bubbles Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6407—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/661—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps by using gas-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/08—Regeneration of the filter
- B01D2201/085—Regeneration of the filter using another chemical than the liquid to be filtered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/08—Regeneration of the filter
- B01D2201/087—Regeneration of the filter using gas bubbles, e.g. air
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Filtration Of Liquid (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a method for cleaning a filter element for viscose production, which solves the technical problem that the cleaning effect of the filter element after filtration is not ideal and needs to be further improved due to the particularity of viscose spinning when the filter element is adopted for filtration in the conventional viscose spinning solution. The invention comprises the following steps: step (1): pre-cleaning a filter element; step (2): leaching and cleaning the filter element with alkali; and (3): soaking the filter element in an oxidant and cleaning; and (4): acid circulation cleaning of the filter element; and (5): and (5) circularly cleaning the filter element by water. The invention has the advantages of good cleaning effect on the viscose spinning solution, simple operation and the like.
Description
Technical Field
The invention relates to the technical field of viscose production, in particular to a method for cleaning a filter element for viscose production.
Background
The filter element is used in the viscose staple fiber production industry, whether in a stock solution production workshop or a spinning production workshop, and plays a vital role. In the stock solution workshop, viscose needs to be filtered through multiple reactions to remove unreacted raw materials of reactants, and in the spinning workshop, viscose spinning solution also needs to be filtered through multiple times to remove impurities such as bubbles, fine particles and the like of the spinning solution to ensure the quality of filaments spun by a spinning machine. Therefore, the quality of the filter element is very important, and the cleaning of the filter element becomes a very important work.
At present, the cleaning method of the filter element at home and abroad mainly comprises the following methods: the first is direct washing with water, the second is soaking with chemical reagent for cleaning, and the third is ultrasonic vibration for cleaning. In the filtration of the viscose spinning solution, due to the particularity of the viscose spinning solution, for example, the viscose spinning solution has certain viscosity and higher adhesiveness. In addition, in the early production, the added auxiliary agent and the alkaline agent influence the subsequent filter element, and the three methods have certain limitation on the filter element for filtering the viscose spinning solution and have unsatisfactory cleaning effect.
Therefore, it is necessary to develop a filter element cleaning method or equipment with better cleaning effect by combining the characteristics of the viscose spinning solution.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: when the existing viscose spinning solution is filtered by adopting a filter element, due to the particularity of viscose spinning, the cleaning effect of the filter element after filtration is not ideal and needs to be further improved.
The invention is realized by the following technical scheme:
a method for cleaning a filter element for viscose production comprises the following steps:
step (1): pre-cleaning a filter element;
step (2): leaching and cleaning the filter element with alkali;
and (3): soaking the filter element in an oxidant and cleaning;
and (4): acid circulation cleaning of the filter element;
and (5): and (5) circularly cleaning the filter element by water.
The filter element is pretreated to remove attachments of part of viscose spinning solution on the surface of the filter element, the viscose needs to be dissolved by adding alkali liquor in the early spinning process, but the viscosity of the whole solution is controlled, so the added alkali liquor is limited, the solubility of the viscose is not maximized, undissolved materials in the viscose spinning solution on the filter element are adhered to the filter element, and when the filter element is soaked in the alkali liquor, the added alkali liquor can better dissolve the materials adhered to the filter element, so that the filter element is easier to fall. The viscose spinning solution is added with the auxiliary agent in the preparation process in the previous period, the auxiliary agent residue is adhered to the filter element, and the auxiliary agent is loosened and falls off by adding the oxidant to act with the auxiliary agent; and then, acid is adopted for circular cleaning, alkali liquor adhered to and permeated in the filter element at the early stage is neutralized, an auxiliary agent adhered to the filter element can be further acted, the auxiliary agent is enabled to fall off, and finally, the filter element is cleaned through water circulation. The invention integrates physical and chemical methods to clean the filter element, and provides a special cleaning method for the filter element of the viscose spinning solution based on the characteristics of various aspects such as viscosity, assistant, dissolution characteristic and the like of the viscose spinning solution, which can better remove attachments on the filter element and has better cleaning effect.
Further preferably, step (5) is followed by step (6), and step (6) includes: and (5) performing caustic dip preservation on the cleaned filter element.
The filter element is placed in water, so that the filter element can dilute the viscose spinning solution when being used, and is stored in alkali liquor.
In a further preferred embodiment, the pre-cleaning method of the filter element comprises the following steps: the filter element to be cleaned is cleaned on the surface of the filter element by the soft hairbrush, the surface of the filter element and the cavity of the filter element are washed by pressurized water, finally the filter element is placed in water, aeration cleaning is carried out in the water by compressed air, and the soft hairbrush can not damage the filter element.
In a further preferred embodiment, the caustic washing of the filter element in the step (2) comprises the following steps: and (2) soaking and washing the pre-cleaned filter element in the step (1) by adopting alkali liquor, wherein the filter element must be completely immersed by the alkali liquor when the filter element is subjected to alkali soaking, the alkali soaking time is 16-20 h, and after the alkali soaking is finished, the filter element is taken out, and the surface of the filter element and a filter element cavity are washed by water.
The alkali adopted by the alkali liquor is sodium hydroxide membrane alkali, and the concentration of the alkali liquor is 40 g/L.
In a further preferred embodiment, the step (3) of cleaning the filter element with the oxidant comprises the following steps: and (3) soaking and cleaning the filter element subjected to the caustic soda cleaning in the step (2) by using an oxidant solution for 30-60 min, taking out the filter element after the filter element is soaked in the oxidant, and cleaning the surface and the cavity of the filter element by using water.
The oxidant is hydrogen peroxide, the concentration of hydrogen peroxide mother liquor is 265-275 g/L, and the concentration of hydrogen peroxide soaked in the filter element is 120-140 g/L.
The filter element cleaning method is carried out on a filter element cleaning device, and the filter element cleaning device comprises a support unit, a pipeline unit, a power unit, a filter element cleaning unit, an acid circulation tank and a water circulation tank.
The support unit has connected pipeline unit, power pack, filter core cleaning unit, acid circulation case and water circulation case respectively, becomes whole filter core belt cleaning device's stress point, and power pack, filter core cleaning unit, acid circulation case, water circulation case are connected respectively to the pipeline unit, provide the infusion pipeline for whole filter core belt cleaning device. The power unit is also provided with a motor M and a circulating pump UP, the filter element cleaning unit is provided with filter element cleaning mechanism filter cylinders L1, L2, L3, L4 and a pressure gauge P, the pipeline units are respectively provided with regulating valves K1, K2, P1, P2, P3, H1, H2 and H3, the acid circulating tank is provided with a drain valve W1, and the water circulating tank is provided with a drain valve W2.
Specifically, the method comprises the following steps: the filter element cleaning unit comprises a plurality of filter cartridges connected in parallel, a valve is arranged below each filter cartridge, and the valves corresponding to the four filter cartridges are a valve F1, a valve F2, a valve F3 and a valve F4 respectively.
The acid circulation tank and the water circulation tank are connected through a first pipeline, the first pipeline is sequentially provided with regulating valves P1 and H1, a second pipeline is connected between the acid circulation tank and the water circulation tank, the second pipeline is sequentially provided with regulating valves P2 and H2, the second pipeline is connected with the top of the filter cartridge, the top of the filter cartridge is communicated with an inner cavity of the filter cartridge, a connection point of the second pipeline and the filter cartridge is positioned between the regulating valves P2 and H2, the acid circulation tank and the water circulation tank are further connected with a third pipeline, the third pipeline is sequentially provided with regulating valves P3 and H3, the third pipeline is connected with the bottom of the filter cartridge, the bottom of the filter cartridge is communicated with the surface of the filter cartridge, a fourth pipeline is connected between the first pipeline and the second pipeline, and an UP circulating pump and a regulating valve K2 are sequentially arranged on the fourth pipeline, the circulating pump UP is connected with a motor M, the connection point of the fourth pipeline and the first pipeline is positioned between regulating valves P1 and H1, the connection point of the fourth pipeline and the first pipeline is positioned between regulating valves P2 and H2, a fifth pipeline is connected between the fourth pipeline and the third pipeline, a regulating valve K1 is arranged on the fifth pipeline, the connection point of the fifth pipeline and the fourth pipeline is positioned between the circulating pump UP and a regulating valve K2, and the connection point of the fifth pipeline and the third pipeline is positioned between a regulating valve P3 and a regulating valve H3.
The connection point of the fourth conduit to the second conduit is between the cartridge cleaning unit and the regulator valve H2, and the connection point of the fifth conduit to the third conduit is between the cartridge cleaning unit and the regulator valve H3.
The filter element cleaning unit is further provided with a pressure gauge, and the pressure gauge is installed on the third pipeline.
Further preferably, based on the above filter element cleaning device, the acid circulation cleaning of the filter element in the step (4) includes a forward acid circulation cleaning, and the forward acid circulation cleaning includes the following steps: opening regulating valves P1, P2 and K1, closing regulating valves H1, H2, H3, K2 and P3, placing the filter element which is soaked and cleaned by the oxidant in the step (3) on a filter element cleaning device, starting a motor, driving a circulating pump to rotate, pumping acid cleaning liquid into the filter cylinder, and performing forward acid circulation cleaning on the filter element for 30-60 min.
In a further preferred embodiment, the water circulation cleaning of the filter element in the step (5) comprises a forward water circulation cleaning, and the forward water circulation cleaning comprises the following steps: and after the acid circulation cleaning of the filter element is finished, closing the filter element cleaning device, closing the regulating valves P1 and P2, opening the regulating valves H1 and H2, starting a motor, driving a circulating pump to rotate, pumping the water circulation cleaning solution into the filter cylinder, and performing forward water circulation cleaning on the filter element for 30-60 min.
In a further preferred embodiment, the acid cycle cleaning of the filter element in the step (4) comprises a reverse acid cycle cleaning, and the reverse acid cycle cleaning comprises the following steps: opening regulating valves P1, P3 and K2, closing regulating valves H1, H2, H3, K1 and P2, placing the filter element which is soaked and cleaned by the oxidant in the step (3) on a filter element cleaning device, starting a motor, driving a circulating pump to rotate, pumping acid cleaning liquid into the filter cylinder, and performing reverse acid circulation cleaning on the filter element for 30-60 min.
In a further preferred embodiment, the water circulation cleaning of the filter element in the step (5) comprises reverse water circulation cleaning, and the reverse water circulation cleaning comprises the following steps: and after the acid circulation cleaning of the filter element is finished, closing the filter element cleaning device, closing the regulating valves P1 and P3, opening the regulating valves H1 and H3, starting a motor, driving a circulating pump to rotate, pumping a water circulation cleaning solution into the filter cylinder, and performing reverse water circulation cleaning on the filter element for 30-60 min.
The filter element can realize forward and reverse cleaning, and can realize the switching selection of different cleaning liquids for cleaning, acid or water moves from the surface of the filter element to the filter element cavity during forward cleaning, and acid or water moves from the filter element cavity to the surface of the filter element during reverse cleaning, so that substances attached to the filter element can be better cleaned through bidirectional cleaning.
For both acid and water circulation cleaning processes, the reading of the pressure gauge P is recorded, which can provide a basis for adjusting the process.
For cleaning the filter element, after the water circulation cleaning in the step (5), if the filter element is not cleaned, repeating the operations in the steps (4) and (5) until the filter element is completely cleaned. And if the filter element is cleaned, taking out the filter element, and placing the filter element in an alkaline leaching tank filled with clean alkaline liquor for standby, wherein the filter element also needs to be completely immersed in the alkaline liquor during alkaline leaching.
The acid is phosphoric acid and the water is soft water.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention combines the characteristics of the viscose spinning solution, and obtains good cleaning effect through preliminary cleaning of the hairbrush, alkali soaking cleaning, hydrogen peroxide soaking cleaning, acid circulation cleaning and water circulation cleaning.
2. According to the filter element cleaning device with the pressure gauge, the filter element can be cleaned in a pressure circulation mode through control of the regulating valve, meanwhile, the cleaning liquid can realize the functions of freely switching selection and forward and reverse cleaning, and the cleaning effect of the filter element is better than that of a traditional cleaning method.
3. The cleaning device disclosed by the invention is simple in structure, convenient to control, low in manufacturing and maintenance cost, low in safety risk, long in service life, stable in performance and high in automation operation degree.
4. The cleaning method has simple process flow and convenient operation, can realize the recycling of the filter element cleaning solution, can save resources, reduces the discharge of the filter element cleaning waste liquid and protects the environment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a process flow diagram of a method of cleaning a filter element according to the present invention.
Fig. 2 is a schematic structural diagram of the filter element cleaning device.
Figure 3 is a view of the filter cartridge of the present invention in direction a.
Figure 4 is a view of the filter cartridge of the present invention in the direction of direction B.
Reference numbers and corresponding part names in the drawings:
1-a support unit, 2-a pipeline unit, 3-a power unit, 4-a filter element cleaning unit, 5-an acid circulation tank, 6-a water circulation tank and 7-a filter cartridge.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, a method for cleaning a filter element for viscose production comprises the following steps:
step (1): pre-cleaning a filter element;
the filter element to be cleaned is cleaned by the soft brush to clean the surface of the filter element, so that the adhesive reactant on the surface of the filter element is brushed clean, the surface of the filter element and a cavity of the filter element are washed by soft water with pressure, finally the filter element is placed in the soft water, aeration cleaning is carried out in the soft water by compressed air, and the filter element cannot be damaged by the soft brush.
Step (2): leaching and cleaning the filter element with alkali;
and (2) placing sodium hydroxide membrane alkali with the concentration of 40g/L into an alkali leaching tank, placing the filter element cleaned by aeration in the step (1) into the alkali leaching tank for alkali leaching, wherein the alkali leaching time is 16-18 h, and when the filter element is subjected to alkali leaching, completely immersing the filter element by alkali liquor. And after the alkali leaching is finished, taking out the filter element, and cleaning the surface of the filter element and alkali liquor in the cavity of the filter element by using soft water.
And (3): soaking the filter element in an oxidant and cleaning;
taking a hydrogen peroxide solution with the mother liquor concentration of 270g/L, preparing an impregnation liquid with the mother liquor concentration of 130g/L, adding the impregnation liquid into a hydrogen peroxide immersion tank, placing the filter element which is subjected to alkali immersion and clean in the step (2) into the immersion tank, and immersing the hydrogen peroxide solution for 45min, wherein the filter element is immersed in the hydrogen peroxide solution, and the hydrogen peroxide solution must completely immerse the filter element. And after the filter element is soaked in the hydrogen peroxide, taking out the filter element, and cleaning the hydrogen peroxide on the surface of the filter element and in the cavity of the filter element by using soft water.
And (4): acid circulation cleaning of the filter element;
and (3) forward acid circulation cleaning: taking 85% phosphoric acid solution, preparing 4% -8% phosphoric acid cleaning solution, adding the phosphoric acid cleaning solution into an acid circulation box 5, opening adjusting valves P1, P2 and K1, closing adjusting valves H1, H2, H3, K2 and P3, placing the filter element which is soaked and cleaned by hydrogen peroxide in the step (3) on a self-made filter element cleaning device, starting a motor M to drive a circulating pump UP to rotate, pumping the phosphoric acid cleaning solution into a filter element cleaning mechanism filter cylinder 7L, and performing acid circulation cleaning on the filter element for 45min, and meanwhile, recording the value of a pressure gauge P during acid circulation cleaning of the filter element.
And (5): circularly cleaning the filter element with water;
after the acid circulation washs the end, close filter core belt cleaning device, close governing valve P1 simultaneously, P2, add soft water in filter core belt cleaning device water circulation case 6, open governing valve H1, H2, starter motor M, drive circulating pump UP and rotate, squeeze into filter core wiper mechanism with the hydrologic cycle washing liquid and strain a section of thick bamboo 7L, carry out the water ring to the filter core and wash, filter core cleaning time is 45min, and simultaneously, when the filter core washs, note the numerical value of manometer P when filter core water ring washs.
And (6): preservation of filter elements
And (4) taking the filter element after the water circulation cleaning in the step (5) is finished out of the filter element cleaning device, and checking whether the filter element is cleaned up. And (5) if the filter element is not cleaned, repeating the operations in the step (4) and the step (5) until the filter element is completely cleaned. And if the filter element is cleaned, taking out the filter element, and placing the filter element in an alkaline leaching tank filled with clean alkaline liquor for standby, wherein the filter element also needs to be completely immersed in the alkaline liquor during alkaline leaching.
The filter element cleaning method is carried out on a filter element cleaning device, and the filter element cleaning device comprises a support unit 1, a pipeline unit 2, a power unit 3, a filter element cleaning unit 4, an acid circulation tank 5 and a water circulation tank 6 as shown in figures 2-4.
Pipeline unit 2, power pack 3, filter core cleaning unit 4, acid cycle case 5 and water cycle case 6 have been connected respectively to support unit 1, become whole filter core belt cleaning device's stress point, and power pack 3, filter core cleaning unit 4, acid cycle case 5, water cycle case 6 are connected respectively to pipeline unit 2, provide the infusion pipeline for whole filter core belt cleaning device. The power unit 3 is further provided with a motor M and a circulating pump UP, the cartridge cleaning unit 4 is provided with cartridge cleaning mechanism cartridges 7L1, L2, L3, L4 and a pressure gauge P, the pipeline unit 2 is provided with adjusting valves K1, K2, P1, P2, P3, H1, H2 and H3, the acid circulating tank 5 is provided with a drain valve W1, and the water circulating tank 66 is provided with a drain valve W2.
Specifically, the method comprises the following steps: the filter element cleaning unit 4 comprises four filter cartridges 7 connected in parallel, a valve is arranged below each filter cartridge 7, and the valves corresponding to the four filter cartridges 7 are a valve F1, a valve F2, a valve F3 and a valve F4 respectively.
The acid circulation tank 5 and the water circulation tank 6 are connected through a first pipeline, the first pipeline is sequentially provided with regulating valves P1 and H1, a second pipeline is connected between the acid circulation tank 5 and the water circulation tank 6, the second pipeline is sequentially provided with regulating valves P2 and H2, the second pipeline is connected with the top of the filter cartridge 7, the connection point of the second pipeline and the filter cartridge 7 is positioned between the regulating valves P2 and H2, a third pipeline is connected between the acid circulation tank 5 and the water circulation tank 6, the third pipeline is sequentially provided with regulating valves P3 and H3, the third pipeline is connected with the bottom of the filter cartridge 7, a fourth pipeline is connected between the first pipeline and the second pipeline, a circulating pump UP and a regulating valve K2 are sequentially arranged on the fourth pipeline, a motor M is connected on the UP circulating pump, and the connection point of the fourth pipeline and the first pipeline is positioned between the regulating valves P1 and H1, the connection point of the fourth pipeline and the first pipeline is located between a regulating valve P2 and an H2, a fifth pipeline is connected between the fourth pipeline and the third pipeline, a regulating valve K1 is arranged on the fifth pipeline, the connection point of the fifth pipeline and the fourth pipeline is located between the circulating pump UP and the regulating valve K2, and the connection point of the fifth pipeline and the third pipeline is located between the regulating valve P3 and the regulating valve H3.
The connection point of the fourth line to the second line is located between the cartridge cleaning unit 4 and the regulating valve H2, and the connection point of the fifth line to the third line is located between the cartridge cleaning unit 4 and the regulating valve H3.
The filter element cleaning unit 4 is further provided with a pressure gauge, and the pressure gauge is installed on the third pipeline.
Example 2
The difference between the embodiment and the embodiment 1 is that the acid circulation cleaning adopts reverse cleaning, and the specific steps are as follows:
and (4): acid reverse circulation cleaning
Taking 85% phosphoric acid solution, preparing 5% phosphoric acid cleaning solution, adding the phosphoric acid cleaning solution into an acid circulation box 5, opening adjusting valves P1, P3 and K2, closing adjusting valves H1, H2, H3, K1 and P2, placing the filter element which is soaked and cleaned by hydrogen peroxide in the step (3) on a self-made filter element cleaning device, starting a motor M to drive a circulating pump UP to rotate, pumping the phosphoric acid cleaning solution into a filter element cleaning mechanism filter cylinder 7L, and performing acid circulation cleaning on the filter element, wherein the filter element cleaning time is 45min, and meanwhile, recording the value of a pressure gauge P during acid circulation cleaning of the filter element.
And (5): reverse water circulation cleaning
After the acid circulation cleaning is finished, the filter element cleaning device is closed, the regulating valves P1 and P3 are closed, a certain amount of soft water is added into the water circulation tank 6 of the filter element cleaning device, the regulating valves H1 and H3 are opened, the motor M is started, the circulating pump UP is driven to rotate, the water circulation cleaning liquid is pumped into the filter cartridge 7L of the filter element cleaning mechanism, the water ring cleaning is carried out on the filter element, and the filter element cleaning time is 45 min. And meanwhile, when the filter element is cleaned, the numerical value of the pressure gauge P when the water ring of the filter element is cleaned is recorded.
Example 3
The difference between this embodiment and embodiments 1 and 2 is that, during the acid circulation cleaning, the forward cleaning is performed for 45min first, and then the reverse cleaning is performed for 45min, and during the water circulation cleaning, the forward cleaning is performed for 45min first, and then the reverse cleaning is performed for 45min, and finally the filter element which is cleaned up is obtained.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for cleaning a filter element for viscose production is characterized by comprising the following steps:
step (1): pre-cleaning a filter element;
step (2): leaching and cleaning the filter element with alkali;
and (3): soaking the filter element in an oxidant and cleaning;
and (4): acid circulation cleaning of the filter element;
and (5): and (5) circularly cleaning the filter element by water.
2. A method for cleaning a filter cartridge for viscose production according to claim 1, wherein step (5) is followed by step (6), and step (6) comprises: and (5) performing caustic dip preservation on the cleaned filter element.
3. The method for cleaning a filter element for viscose production according to claim 1, wherein the method for pre-cleaning the filter element comprises the following steps: cleaning the surface of the filter element by using a soft brush for the filter element to be cleaned, washing the surface of the filter element and the cavity of the filter element by using pressurized water, finally placing the filter element in water, and carrying out aeration cleaning in the water by using compressed air.
4. The method for cleaning a filter element for viscose production according to claim 1, wherein the step (2) of caustic washing the filter element comprises the following steps: and (2) soaking and washing the filter element pre-cleaned in the step (1) by adopting alkali liquor, wherein the soaking time is 16-20 h, taking out the filter element after the soaking is finished, and cleaning the surface and the cavity of the filter element by using water.
5. The method for cleaning a filter element for viscose production according to claim 1, wherein the step (3) of cleaning the filter element by soaking in an oxidizing agent comprises the following steps: and (3) soaking and cleaning the filter element subjected to the caustic soda cleaning in the step (2) by using an oxidant solution for 30-60 min, taking out the filter element after the filter element is soaked in the oxidant, and cleaning the surface and the cavity of the filter element by using water.
6. A method for cleaning a filter element for viscose production according to claim 1 or 2, wherein the acid circulation cleaning of the filter element of the step (4) comprises a forward acid circulation cleaning, and the forward acid circulation cleaning comprises the following steps: opening regulating valves P1, P2 and K1, closing regulating valves H1, H2, H3, K2 and P3, placing the filter element which is soaked and cleaned by the oxidant in the step (3) on a filter element cleaning device, starting a motor, driving a circulating pump to rotate, pumping acid cleaning liquid into a filter cylinder (7), and performing forward acid circulation cleaning on the filter element for 30-60 min.
7. A method for cleaning a filter element for viscose production according to claim 3, wherein the step (5) of water circulation cleaning of the filter element comprises a forward water circulation cleaning, and the forward water circulation cleaning comprises the following steps: and after the acid circulation cleaning of the filter element is finished, closing the filter element cleaning device, closing the regulating valves P1 and P2, opening the regulating valves H1 and H2, starting a motor, driving a circulating pump to rotate, pumping the water circulation cleaning solution into the filter cylinder (7), and performing forward water circulation cleaning on the filter element for 30-60 min.
8. A method for cleaning a filter element for viscose production according to claim 3, wherein the acid circulation cleaning of the filter element of the step (4) comprises a reverse acid circulation cleaning, and the reverse acid circulation cleaning comprises the following steps: opening regulating valves P1, P3 and K2, closing regulating valves H1, H2, H3, K1 and P2, placing the filter element which is soaked and cleaned by the oxidant in the step (3) on a filter element cleaning device, starting a motor, driving a circulating pump to rotate, pumping acid cleaning liquid into a filter cylinder (7), and carrying out reverse acid circulation cleaning on the filter element for 30-60 min.
9. A method for cleaning a filter element for viscose production according to claim 1 or 2, wherein the step (5) of water circulation cleaning of the filter element comprises a reverse water circulation cleaning, and the reverse water circulation cleaning comprises the following steps: and after the acid circulation cleaning of the filter element is finished, closing the filter element cleaning device, closing the regulating valves P1 and P3, opening the regulating valves H1 and H3, starting a motor, driving a circulating pump to rotate, pumping a water circulation cleaning solution into the filter cylinder (7), and performing reverse water circulation cleaning on the filter element for 30-60 min.
10. A method for cleaning a filter element for viscose production according to claim 1 or 2, wherein the alkali is sodium hydroxide, the oxidant is hydrogen peroxide, and the acid is phosphoric acid.
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