CN110732174A - nitrocotton replacement acid filtering device and filtering method - Google Patents
nitrocotton replacement acid filtering device and filtering method Download PDFInfo
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- CN110732174A CN110732174A CN201911142052.1A CN201911142052A CN110732174A CN 110732174 A CN110732174 A CN 110732174A CN 201911142052 A CN201911142052 A CN 201911142052A CN 110732174 A CN110732174 A CN 110732174A
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- acid
- nitrocotton
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- stainless steel
- filtering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/01—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons
- B01D33/03—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements
- B01D33/0346—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements
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Abstract
The invention discloses an nitrocotton replacement acid filtering device, which adopts a vibration filtering mode, wherein fine fibers are easy to agglomerate and output under the action of vibration force, the technical problem of fine fiber net hanging and blocking is solved, meanwhile, the operation is simple and convenient, the labor intensity is low, compared with a traditional inclined surface filtering sieve and a replacement acid rotary drum filter, the treatment efficiency of the vibration filtering sieve is high, the occupied area of equipment is small, the cleaning degree of replacement acid is improved, the quality of a nitrocotton product is improved, and the stable and good operation of cyclic washing of the replacement acid is ensured.
Description
Technical Field
The invention belongs to the technical field of nitrocotton replacement and filtration equipment, and particularly relates to an nitrocotton replacement acid filtration device and a nitrocotton replacement acid filtration method.
Background
The nitrated cotton belongs to cellulose derivative, and the refined cotton (wood pulp, cotton pulp) and mixed acid are esterified in the nitrating machine.
After the esterification reaction is finished, acid and cotton mixture is usually subjected to acid and cotton separation and washing in a horizontal centrifuge, and the process is called as acid driving and displacement washing, because the residual acid degree in the material after the acid driving is still high, the material needs to be subjected to displacement washing, and is carried out to reduce the residual acid degree in the cotton material, reduce the residual acid amount in the cotton material as much as possible and reduce the production cost of the nitrocotton.
fine fibers can enter the replacement acid through a screen plate gap of a centrifugal machine (usually, the screen plate gap of the centrifugal machine is 15-20 threads) during replacement washing, and the fine fibers are brought into different varieties of nitrocotton products through replacement acid circulation washing to directly influence the quality of the nitrocotton products (especially the dissolving performance of the nitrocotton products), in addition, because the centrifugal machine is high-speed rotating equipment, the influence of centrifugal force on the acid replacement washing position must be overcome during washing, the replacement acid needs to ensure constant pressure, various forms of nozzles are adopted for spray washing under the common condition, and at the moment, the fine fibers in the replacement acid can block the nozzles to influence the smooth operation of a replacement acid system.
In order to improve the product quality of the nitrocotton and ensure the good operation of nitrocotton displacement washing, the displacement acid must be filtered. However, because the rigidity of the fine fibers is poor, the pressure filtration mode is adopted, the putty net (net hanging) is frequent, and the putty net (net hanging) material is difficult to clean no matter the modes such as back flushing or material scraping are adopted. Therefore, the traditional nitrocellulose replacement acid filtration adopts an inclined filter sieve or a rotary drum filter sieve (the filter aperture is 3-5mm) for simple filtration, the fiber content in the filtered replacement acid is still high, the product quality is influenced, and the nozzle of the replacement acid is frequently blocked.
Disclosure of Invention
The invention aims to provide an nitrocotton replacement acid filtering device, which solves the problem of fine fiber hanging net blockage during replacement acid filtration.
Another objective of the invention is to provide nitrocotton replacement acid filtration methods.
The technical scheme includes that the nitrocotton replacement acid filtering device comprises a filtering box with an inclined bottom surface, wherein a vibration buffering support is connected to the side wall of the outer portion of the filtering box, a vibration motor is connected to the vibration buffering support, a stainless steel bottom plate is connected to the parallel bottom surface in the filtering box, a plurality of 1-2mm filtering holes are uniformly formed in the stainless steel bottom plate, the stainless steel bottom plate is connected with a 120-mesh and 150-mesh stainless steel woven net in a tiled mode, the edge of the stainless steel woven net is detachably connected with the inner wall of the filtering box, the filtering box is divided into a material passing cavity and an peracid cavity by a sieve plate, the filtering box is located on the highest side surface of the material passing cavity and is connected with a plurality of feeding pipes, the bottom end of the peracid cavity is connected with a plurality of discharging pipes, the filtering box is located at the bottom end of the peracid cavity and is connected with an acid storage container, the bottom end of each acid storage container is connected with acid outlet pipes, the peracid cavity, the acid storage container and the acid outlet pipes are communicated, the upper end of the filtering box is connected with a.
The invention is also characterized in that:
the inclination angle of the bottom surface of the filter box relative to the horizontal plane is 5-15 degrees.
Connect a plurality of baffles along the incline direction on the sieve, a plurality of baffles will cross the material chamber and cut apart into a plurality of material chamber units that cross, and every material chamber unit that crosses corresponds at least inlet pipes and at least discharging pipes, and the baffle that a plurality of and baffle correspond is connected in the peracid intracavity, cuts apart into a plurality of peracid chamber units with the peracid chamber.
The edge of the stainless steel woven net is upwards connected to the inner wall of the filter box through a stainless steel woven net pressing bar.
The cross section of the filter box positioned in the peracid cavity is a trapezoid with a small bottom length.
The outside welding bracing piece of rose box lateral wall, on the vibration buffering support joint bracing piece.
The vibration buffering support comprises four support columns which are arranged in a quadrilateral mode, a connecting rod is connected between every two adjacent support columns, a shell is sleeved on each support column, and a spring is connected between each support column and the corresponding shell.
The spring is a fluororubber spring.
The invention adopts another technical scheme that the nitrocotton replacement acid filtering method is implemented by using nitrocotton replacement acid filtering devices, and specifically comprises the following steps of starting a vibration motor, vibrating the vibration motor up and down, driving a filtering box through a vibration buffering bracket, discharging nitrocotton replacement acid into the filtering box through a feeding pipe, enabling the nitrocotton replacement acid to flow along an inclined stainless steel woven net, enabling acid in the nitrocotton replacement acid to enter an acid cavity through filtering holes of the stainless steel woven net and a stainless steel bottom plate, leaving fine fibers on the stainless steel woven net, continuously vibrating and pressing out acid in the fine fibers under the vibration action, enabling the fine fibers to move downwards and gradually agglomerate, enabling the fine fibers to move to the discharging pipe under the vibration action after the fine fibers agglomerate, discharging the acid through a discharging pipe discharging device, enabling the filtered acid to enter an acid storage container through an acid cavity, and discharging the acid through an acid discharging pipe, so that filtering of the nitrocotton replacement acid is realized.
nitrocotton replacement acid filtering methods, using nitrocotton replacement acid filtering devices, simultaneously filtering a plurality of different nitrocotton replacement acids, specifically comprising the following steps of starting a vibration motor, vibrating the vibration motor up and down, driving a filtering box through a vibration buffering bracket, respectively discharging the plurality of nitrocotton replacement acids into different material passing cavity units through different feeding pipes, enabling the nitrocotton replacement acids to flow along an inclined stainless steel woven net, enabling the acids to enter different peracid cavity units through filtering holes of the stainless steel woven net and a stainless steel bottom plate, leaving fine fibers on the stainless steel woven net, continuously vibrating and pressing out the acids in the fine fibers under the vibration action, enabling the fine fibers to move downwards and gradually agglomerate, enabling the fine fibers to move to corresponding discharging pipes under the vibration action after the fine fibers agglomerate, enabling the fine fibers to pass through corresponding discharging pipe discharging devices, enabling the filtered acids to enter corresponding acid storage containers through corresponding acid discharging pipes, and discharging the acids through corresponding acid discharging pipes, namely achieving simultaneous filtering of the plurality of different nitrocotton replacement acids.
The invention has the beneficial effects that:
the nitrocotton replacement acid filtering device adopts a vibration filtering mode, so that fine fibers are easy to agglomerate and output under the action of vibration force, the technical problem of fine fiber hanging net blockage is solved, the operation is simple and convenient, the labor intensity is low, compared with the traditional inclined surface filtering sieve and a replacement acid rotary drum filter, the treatment efficiency of the vibration filtering sieve is high, the equipment occupation is small, the cleaning degree of replacement acid is improved, the quality of nitrocotton products is improved, and the stable and good operation of replacement acid circular washing is ensured.
The nitrocotton replacement acid filtering method can efficiently filter the fine fibers in the nitrocotton replacement acid, and can also filter various acids at the same time, thereby improving the filtering efficiency and saving the human resources.
Drawings
FIG. 1 is a side view of nitrocotton displacement acid filter units of the present invention;
FIG. 2 is a front view of an nitrocotton displacement acid filter unit;
FIG. 3 is a top view of nitrocotton displacement acid filter units of the present invention;
fig. 4 is a cross-sectional view of a filter box according to the present invention.
In the figure, 1, a filter box, 2, a support column, 3, a vibrating motor, 4, a feeding pipe, 5, a discharging pipe, 6, a machine cover, 7, a negative pressure exhaust pipe, 8, a partition plate, 9, a stainless steel bottom plate, 10, a stainless steel woven net, 11, a stainless steel woven net pressing strip, 12, an acid storage container, 13, an acid outlet pipe, 14, a support rod, 15, a connecting rod, 16, a shell and 17 are springs.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The nitrocotton replacement acid filtering device comprises a filtering box 1 with an inclined bottom surface, wherein the outer side wall of the filtering box 1 is connected with a vibration buffering support, the vibration buffering support is connected with a vibration motor 3, the parallel bottom surface in the filtering box 1 is connected with a stainless steel bottom plate 9, a plurality of filtering holes of 1-2mm are uniformly formed in the stainless steel bottom plate 9, the stainless steel bottom plate 9 is flatly paved and connected with a stainless steel woven net 10 of 120 meshes and 150 meshes, the edge of the stainless steel woven net 10 is detachably connected with the inner wall of the filtering box 1, the filtering box 1 is conveniently detached, replaced and maintained, the filtering box 1 is divided into a material passing cavity and a peracid cavity by a sieve plate, the filtering box 1 is positioned on the highest side surface of the material passing cavity and connected with a plurality of feeding pipes 4, the bottom end of the lowest side surface of the filtering box 1 is connected with a plurality of discharging pipes 5, the bottom end of the filtering box 1 is positioned on the peracid cavity and connected with an acid storage container 12, the bottom end of each acid storage container 12 is connected with acid outlet pipes 13, the acid storage container 12 is communicated with an acid outlet pipe 6, the filtering box 1, the upper end of the filtering box 1 is connected with an opening of a cover 6, and an opening of a cover 6.
The inclination angle of the bottom surface of the filter box 1 relative to the horizontal plane is 5-15 degrees.
Connect a plurality of baffles 8 along the incline direction on the sieve, a plurality of baffles 8 will cross the material chamber and cut apart into a plurality of material chamber units of crossing, and every material chamber unit of crossing corresponds at least inlet pipes 4 and at least discharging pipes 5, connects a plurality of baffles that correspond with baffle 8 in the peracid intracavity, will cross the acid chamber and cut apart into a plurality of peracid chamber units.
The edge of the stainless steel woven net 10 is upwards connected to the inner wall of the filter box 1 through a stainless steel woven net pressing strip 11.
As shown in fig. 4, the cross section of the filter box 1 in the peracid chamber is a trapezoid with a small bottom length.
The outside welding bracing piece 14 of rose box 1 lateral wall, on the vibration buffering support connection bracing piece 14.
The vibration buffering support comprises four support columns 2 which are arranged in a quadrilateral mode, connecting rods 15 are connected between the adjacent support columns 2, a shell 16 is sleeved on each support column 2, and a spring 17 is connected between each support column 2 and the corresponding shell 16.
The spring 17 is a fluororubber spring.
The nitrocotton displacement acid filtering device has the following functions:
the filter box 1 is quadrangular box bodies, the inclined angle between the ground and the horizontal plane is 5-15 degrees, and the fine fibers can move from top to bottom, gather and automatically discharge.
Vibrating motor 3 connects on support column 2, can produce the vibration to drive the vibration of rose box 1, tiny fibre moves down with higher speed.
The feed pipe 4 is capable of feeding acid mixed with fine fibers into the filtration tank 1.
The discharge pipe 5 can discharge the agglomerated fibers.
The lid 6 can prevent acid in the filter tank 1 from splashing out.
The negative pressure exhaust pipe 7 is used for collecting nitrogen oxides volatilized from the replacement acid, and the operation environment is guaranteed.
A plurality of baffle 8 will cross the material chamber and cut apart into a plurality of material chamber units of crossing, can carry out the filtration of multiple acid simultaneously, design a plurality of filtration passageways, reduce the equipment and drop into.
The stainless steel bottom plate 9 and the stainless steel woven net 10 can separate the fine fibers from the acid, and the acid enters the peracid cavity through the stainless steel bottom plate 9 and the stainless steel woven net 10.
The stainless steel woven mesh pressing strip 11 can enable the stainless steel woven mesh 10 to extend along the inner wall of the filter box 1, and prevents fine fibers from entering an acid cavity through edge gaps.
The acid storage container 12 is a storage solution for the filtered acid.
The acid outlet pipe 13 can lead out the acid in the acid storage container 12.
The spring 17 is a fluorine rubber spring to prevent the spring from being corroded, and can play a role in buffering vibration and protecting the device when in use.
The nitrocellulose in the replacement acid has the characteristics that the nitrocellulose is poor in rigidity, relatively soft, natural filtration or differential pressure filtration is carried out, the fibers easily penetrate through a filter screen, the hanging phenomenon occurs, the cleaning is difficult, meanwhile, the replacement acid is a mixture of nitric acid, sulfuric acid and water, -degree safety hidden danger exists in the differential pressure filtration, the fiber which leaks through a screen plate gap (0.15-0.20mm) of a centrifugal machine is small in particle size, however, the small fibers denier are separated out, and the small fibers are gradually agglomerated under the action of external force, and obvious cotton clusters which can be seen by naked eyes are formed.
The nitrocotton replacement acid filtering method disclosed by the invention uses nitrocotton replacement acid filtering devices and is implemented according to the following steps:
starting the vibration motor 3, vibrating the vibration motor 3 up and down, and driving the filter box 1 through the vibration buffering bracket; discharging nitrocotton replacement acid into the filter box 1 through the feeding pipe 4, wherein the nitrocotton replacement acid flows along the inclined stainless steel woven mesh 10, the acid in the nitrocotton replacement acid enters the peracid cavity through the stainless steel woven mesh 10 and the filtering holes of the stainless steel bottom plate 9, and fine fibers are left on the stainless steel woven mesh 10; under the vibration effect, the acid in the fine fiber is constantly shaken out, and fine fiber moves down simultaneously, and progressively gathers together, and fine fiber gathers together the back and moves to discharging pipe 5 department under the vibration effect, through discharging pipe 5 eduction gear, and the acid after the filtration simultaneously gets into acid storage container 12 through the peracid chamber, discharges the acid through acid discharging pipe 13, realizes the filtration of nitrocotton replacement acid promptly.
nitrocotton replacement acid filtering methods, using nitrocotton replacement acid filtering devices, simultaneously filtering a plurality of different nitrocotton replacement acids, specifically including the following steps of starting a vibration motor 3, vibrating the vibration motor 3 up and down, driving a filter box 1 through a vibration buffer bracket, respectively discharging the plurality of nitrocotton replacement acids into different material passing cavity units through different feed pipes 4, enabling the nitrocotton replacement acids to flow along an inclined stainless steel woven net 10, enabling the acids to enter different peracid cavity units through filter holes of the stainless steel woven net 10 and a stainless steel bottom plate 9, leaving fine fibers on the stainless steel woven net 10, continuously vibrating and extruding the acids in the fine fibers under the vibration effect, enabling the fine fibers to move downwards and to be gradually agglomerated, enabling the fine fibers to move to corresponding discharge pipes 5 under the vibration effect after being agglomerated, enabling the fine fibers to pass through corresponding discharge pipes 5 and discharge the filtered acids into corresponding acid storage containers 12 through acid cavities, and discharging the nitrocotton replacement acids through corresponding acid discharge pipes 13, namely achieving simultaneous filtration of the plurality of different nitrocotton replacement acids.
Through the mode, the nitrocotton replacement acid filtering device disclosed by the invention adopts a vibration filtering mode, so that fine fibers are easy to agglomerate and output under the action of vibration force, the technical problem of fine fiber net hanging and blocking is solved, the operation is simple and convenient, the labor intensity is low, compared with the traditional inclined surface filtering sieve and a replacement acid rotary drum filter, the vibration filtering sieve is high in treatment efficiency and small in equipment occupation area, the cleaning degree of replacement acid is improved, the quality of a nitrocotton product is improved, and the stable and good operation of replacement acid circulating washing is guaranteed.
Claims (10)
- The nitrocotton replacement acid filter equipment of kinds, its characterized in that, including rose box (1) that the bottom surface slope set up, vibration buffering support is connected to rose box (1) outside lateral wall, connect vibrating motor (3) on the vibration buffering support, stainless steel bottom plate (9) are connected to the parallel bottom surface in rose box (1), evenly set up a plurality of 1-2 mm's filtration pore on stainless steel bottom plate (9), stainless steel bottom plate (9) tiling is connected 120 and is had good care 150 purpose stainless steel and compile net (10), and stainless steel compiles net (10) edge and rose box (1) inner wall can be dismantled and be connected, the sieve is cut apart rose box (1) and is for expecting chamber and peracid chamber, rose box (1) are located and connect a plurality of inlet pipes (4) on expecting the highest side in the chamber, rose box (1) are located and are expected the chamber bottom and connect a plurality of outlet pipes (5), rose box (1) are located and connect and store up acid container (12) bottom, every store up acid container (12) bottom and connect ), acid outlet pipe (13) mouth, discharge pipe (13), the inlet pipe (13) are connected the cover (6), the opening, the inlet pipe (13) is connected to the inlet pipe (6), the inlet pipe (13), the inlet pipe (6) is connected to the filter box (13), the inlet pipe (13) upper end, the filter box (6) is connected the negative pressure hose (13) is connected.
- 2. The nitrocotton displacement acid filter unit of claim 1, wherein the inclination angle of the bottom of the filter box (1) relative to the horizontal plane is 5-15 °.
- 3. The nitrocotton replacement acid filter unit according to claim 1, wherein a plurality of partition plates (8) are connected to the sieve plate along an inclined direction, the plurality of partition plates (8) divide the material passing chamber into a plurality of material passing chamber units, each material passing chamber unit corresponds to at least feed pipes (4) and at least discharge pipes (5), a plurality of baffle plates corresponding to the partition plates (8) are connected to the peracid chamber, and the peracid chamber is divided into a plurality of peracid chamber units.
- 4. The nitrocotton displacement acid filter unit according to claim 1, wherein the edge of the stainless steel woven mesh (10) is connected upward to the inner wall of the filter box (1) by a stainless steel woven mesh pressing bar (11).
- 5. The nitrocotton replacement acid filter equipment according to claim 1, wherein, the cross section of the filter box (1) in the peracid chamber is a trapezoid with a small bottom length.
- 6. The nitrocotton replacement acid filter equipment of claim 1, wherein, the outside of the side wall of the filter box (1) is welded with a support rod (14), and the vibration damping bracket is connected with the support rod (14).
- 7. The nitrocotton replacement acid filter unit according to claim 1, wherein the vibration damping support includes four support columns (2) in a quadrilateral arrangement, a connecting rod (15) is connected between adjacent support columns (2), a housing (16) is sleeved on each support column (2), and a spring (17) is connected between each support column (2) and the corresponding housing (16).
- 8. The nitrocotton replacement acid filter equipment of claim 7, wherein, the spring (17) is a fluororubber spring.
- 9, nitrocotton replacement acid filtering methods, characterized by using nitrocotton replacement acid filtering device according to any of claims 1-8, and implemented by the steps of starting a vibration motor (3), vibrating the vibration motor (3) up and down, driving a filter box (1) through a vibration buffer bracket, discharging nitrocotton replacement acid into the filter box (1) through a feeding pipe (4), wherein the nitrocotton replacement acid flows along an inclined stainless steel woven mesh (10), acid in the nitrocotton replacement acid enters an acid cavity through filter holes of the stainless steel woven mesh (10) and a stainless steel bottom plate (9), fine fibers are left on the stainless steel woven mesh (10), acid in the fine fibers is continuously vibrated out under the vibration effect, the fine fibers move downwards, the fine fibers are gradually agglomerated, the fine fibers are agglomerated, and then move to a discharge pipe (5) under the vibration effect, the acid is discharged out of a discharge pipe (5), and the filtered acid enters an acid storage container (12) through the acid discharge pipe (13), namely, and the nitrocotton replacement acid is filtered.
- 10. The nitrocotton replacement acid filtering method according to claim 9, wherein the nitrocotton replacement acid filtering device of claim 3 is used for simultaneously filtering a plurality of different nitrocotton replacement acids, and the method is implemented by starting the vibration motor (3), vibrating the vibration motor (3) up and down to drive the filtering box (1) through the vibration buffer bracket, respectively discharging the nitrocotton replacement acids into different material passing cavity units through different feeding pipes (4), allowing the nitrocotton replacement acids to flow along the inclined stainless steel woven net (10), allowing the acids to enter different acid cavity units through the filtering holes of the stainless steel woven net (10) and the stainless steel bottom plate (9), leaving fine fibers on the stainless steel woven net (10), continuously vibrating and pressing out the acids in the fine fibers while the fine fibers move downwards to gradually agglomerate, allowing the fine fibers to move to the corresponding discharging pipes (5) under the vibration action after agglomerating, allowing the acids to enter the corresponding discharging pipes (5) through the corresponding discharging devices, simultaneously filtering the acids after filtering to enter the acid passing through the corresponding discharging pipes (12), and discharging the acids through the corresponding discharging pipes (13) and discharging the nitrocotton replacement acids.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911142052.1A CN110732174A (en) | 2019-11-20 | 2019-11-20 | nitrocotton replacement acid filtering device and filtering method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911142052.1A CN110732174A (en) | 2019-11-20 | 2019-11-20 | nitrocotton replacement acid filtering device and filtering method |
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| CN110732174A true CN110732174A (en) | 2020-01-31 |
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| CN201911142052.1A Pending CN110732174A (en) | 2019-11-20 | 2019-11-20 | nitrocotton replacement acid filtering device and filtering method |
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Cited By (1)
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| CN112500500A (en) * | 2020-11-25 | 2021-03-16 | 北方化学工业股份有限公司 | Device and method for recovering residual acid of nitrocellulose |
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Address after: 646605 Sichuan city of Luzhou province high dam Applicant after: North Chemical Industry Co.,Ltd. Address before: 646605 Sichuan city of Luzhou province high dam Applicant before: SICHUAN NITROCELLULOSE Corp. |
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