CN216259559U - Continuous thickening system for crude adipic acid slurry - Google Patents
Continuous thickening system for crude adipic acid slurry Download PDFInfo
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- CN216259559U CN216259559U CN202122876705.8U CN202122876705U CN216259559U CN 216259559 U CN216259559 U CN 216259559U CN 202122876705 U CN202122876705 U CN 202122876705U CN 216259559 U CN216259559 U CN 216259559U
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Abstract
The utility model belongs to the technical field of adipic acid production equipment, and particularly relates to a continuous thickening system for crude adipic acid slurry, which comprises a crude adipic acid slurry storage tank, a crude adipic acid thickener, a centrifugal machine, a crude adipic acid dissolving tank, a thickener clear liquid storage tank, a thickener filtering and beating backwashing storage tank, a thickener gas-liquid separation tank, an absorption tower and a draught fan; and the outlet end at the bottom of the crude adipic acid slurry storage tank is communicated with the liquid inlet end of the crude adipic acid thickener through a pipeline. According to the utility model, the coarse adipic acid thickener is added in the coarse adipic acid slurry continuous thickening system, and the coarse adipic acid dissolving tank, the thickener clear solution storage tank, the thickener filtering backwashing storage tank, the thickener gas-liquid separation tank and the coarse adipic acid thickener are connected in series for use, so that not only can the clear solution in the coarse adipic acid slurry be separated, but also the adipic acid crystals in the coarse adipic acid slurry can be concentrated and separated.
Description
Technical Field
The utility model belongs to the technical field of adipic acid production equipment, and particularly relates to a thickening system for granular materials in a chemical production process, in particular to a continuous thickening system for crude adipic acid slurry.
Background
The process method for producing adipic acid in the prior art mainly adopts a nitric acid oxidation method to obtain adipic acid by taking cyclohexanol as a raw material, wherein adipic acid generated in the reaction process is dissolved in excessive nitric acid solution, and a finished product of adipic acid can be obtained only by further crystallization and separation. In the process of adipic acid crystallization, the concentration of adipic acid crystal slurry discharged from a crystallizer is about 15wt%, and a centrifuge for separating adipic acid requires the feed concentration to be about 40wt%, so that the crystallized adipic acid crystal slurry needs to be thickened before the adipic acid is centrifugally separated so as to meet the requirement of centrifugal separation.
The prior adipic acid thickening process mostly uses a static cluster thickener (the structure is shown in Chinese patent with the publication number of CN102731289A, a thickening process of crude adipic acid). Static cluster type thickener comprises thickener casing and long-pending bundle tubular filter core, has a plurality of filter core on the thickener tube side filter tube, can realize multichannel filtration in step. However, the static cluster thickener also has the following problems during the use process: 1. the control program of the static bunching thickener is completed by a plurality of sequential valves together, one cycle needs to be completed by 8 steps of filling liquid, cleaning filter cloth, pre-filtering, emptying feed liquid, washing filter cakes, dehumidifying filter cakes, unloading filter cakes and the like, the use process is complex, and the thickening effect of the thickener can be influenced when the sequential valves used for adjusting each process are poor in action or leak inwards; 2. the thickener filter stick is long and is easy to break, which affects the stable production of the device; 3. in the existing production process, the stripping of a filter cake in the static bunching thickener mainly adopts a wind blowing mode, but because a certain amount of impurities exist in the wind blowing process, the product quality is influenced to a certain extent; 4. the adipic acid slurry storage tank is arranged at the lower part of the thickener, so that the occupied space of equipment is increased, and the requirement on the integral elevation of the device is higher; 5. the thickener is an intermittent thickening device, can not feed continuously, and causes a plurality of uncertain factors for the stable operation of the whole production device.
In order to solve the problems, the inventor designs a system and a thickening process for continuously thickening crude adipic acid slurry, which can be used for solving the problems that equipment for thickening crude adipic acid in the prior art occupies a large space, a control system is complex and is easy to break down, and can also avoid the phenomenon that a filter stick is easy to break when the filter stick is adopted to separate adipic acid particles in the crude adipic acid slurry in the prior art.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems that the common equipment for thickening the crude adipic acid in the prior art occupies a large space, the control system is complex and the fault is easy to occur, or when a filter stick is adopted to separate adipic acid particles in the crude adipic acid slurry, the filter stick is easy to break and the stable operation of an adipic acid device is realized, the application designs a continuous thickening system for the crude adipic acid slurry.
Based on the purpose, the utility model adopts the following technical scheme:
a continuous thickening system for crude adipic acid slurry comprises a crude adipic acid slurry storage tank, a crude adipic acid thickener, a centrifuge, a crude adipic acid dissolving tank, a thickener clear liquid storage tank, a thickener filtering and backwashing storage tank, a thickener gas-liquid separation tank, an absorption tower and a draught fan;
the outlet end of the bottom of the crude adipic acid slurry storage tank is communicated with the liquid inlet end of the crude adipic acid thickener through a pipeline;
the crude adipic acid thickener comprises an upper shell, a lower shell and a cylindrical distributor arranged at the rear side of the upper shell;
the top end of the lower shell is communicated with the bottom end of the upper shell, a supporting plate is arranged at the joint of the bottom end of the upper shell and the lower shell, and a discharging hole is formed in the supporting plate;
a main shaft extending along the front-back direction is arranged in the upper shell, a shaft sleeve is arranged outside the main shaft, a cavity is formed by the shaft sleeve in a hollow mode, a plurality of filter discs extending along the radial direction of the main shaft are arranged outside the shaft sleeve, the front end of the main shaft extends out of the upper shell, a first motor is arranged at the front end of the main shaft,
the cylindrical distributor is a hollow cylindrical structure, the cylindrical distributor is divided into three cavities by three clapboards extending along the axial direction of the cylindrical distributor,
a plurality of first round holes are formed in the front side of the cylindrical distributor and communicated with the three cavities respectively;
the rear end of the shaft sleeve is provided with a plurality of second round holes which are the same as the first round holes, the second round holes are the same as the first round holes in size and correspond to the first round holes in position, and the second round holes are abutted against the first round holes;
the third cavity is provided with a first liquid outlet pipe, and the first cavity is provided with a first liquid inlet pipe;
a first liquid outlet pipe of the third cavity is communicated with the inlet end of the thickener clear liquid storage tank through a suction pipeline;
the first liquid inlet pipe of the first cavity is communicated with the liquid outlet end at the bottom of the thickener filtering and backwashing storage tank through a backwashing pipeline;
the bottom end of the lower shell is provided with a collecting port end which is communicated with a liquid inlet end at the top of the centrifugal machine through a pipeline, and a liquid outlet end at the bottom of the centrifugal machine is communicated with the crude adipic acid dissolving tank through a pipeline;
the liquid outlet end at the bottom of the thickener clear liquid storage tank is communicated with the inlet end at the bottom of the thickener filtering and backwashing storage tank through a pipeline;
the top of the thickener filter flap backwashing storage tank is provided with a liquid outlet end, the bottom of the thickener filter flap backwashing storage tank is provided with a second liquid return end, the liquid outlet end at the top of the thickener filter flap backwashing storage tank is communicated with the liquid inlet end of the thickener gas-liquid separation tank through a pipeline, and the second liquid return end at the bottom of the thickener filter flap backwashing storage tank is communicated with the upper shell of the crude adipic acid thickener through a pipeline;
the outlet end of the thickener gas-liquid separation tank is communicated with the inlet end of the absorption tower through a pipeline.
Furthermore, an input pipe is arranged at the top end of the crude adipic acid slurry storage tank, the bottom end of the input pipe extends into the crude adipic acid slurry storage tank, and the input pipe is used for inputting the crystallized crude adipic acid slurry into the crude adipic acid slurry storage tank and storing the crystallized crude adipic acid slurry.
Furthermore, a coarse adipic acid slurry pump and a thickener feeding control valve are arranged on a pipeline of the coarse adipic acid slurry storage tank communicated with the coarse adipic acid thickener.
Furthermore, the upper shell is of a rectangular box structure extending along the front-back direction, and the lower shell is of a funnel-shaped box structure extending along the front-back direction, so that sedimentation of coarse adipic acid particles is facilitated, and thickening of coarse adipic acid slurry is accelerated.
Further, the filter disc is equipped with 5, 5 filter discs are arranged along the fore-and-aft direction in proper order, and every filter disc thickness is 50mm, and every filter disc is strained by 8 independent fan-shaped and claps and constitutes, and the size that every fan-shaped was strained the bat is the size of 1/8 filter disc, and 8 fan-shaped is strained and is clapped and link to each other the range in proper order along the circumference, and adjacent two fan-shaped are strained and are clapped by the baffle interval between the bat, and every fan-shaped is strained the one end that claps near the axle sleeve and is linked together with the axle sleeve, and every fan-shaped is strained and is clapped front side and rear side and constitute by the metal mesh, and the aperture of through-hole is 2000 meshes on the metal mesh.
Further, the three cavities of the cylindrical distributor are specifically a first cavity occupying 1/8 of the volume of the cylindrical distributor, a second cavity occupying 1/8 of the volume of the cylindrical distributor and a third cavity occupying 6/8 of the volume of the cylindrical distributor, the first cavity is positioned at the lower part in the cylindrical distributor, and the second cavity is adjacent to the first cavity; the third cavity is a suction area, the first cavity is a backwashing area, and the second cavity is a discharging area; the cylindrical dispenser is fixed to the rear side of the upper case by a support bracket.
Furthermore, 8 first round holes are formed in the front side of the cylindrical distributor, the 8 first round holes are arranged along the circumference, one first round hole is communicated with the first cavity, one first round hole is communicated with the second cavity, and six first round holes are communicated with the third cavity;
the rear end of the shaft sleeve extends out of the upper shell, 8 second round holes which are the same as the first round holes are formed in the rear end of the shaft sleeve, the second round holes are the same as the 8 first round holes in the front side of the cylindrical distributor in size and correspond to the 8 first round holes in position, and the second round holes are in abutting joint with the 8 first round holes.
Furthermore, a plurality of scraper groups are arranged on the upper end face of the supporting plate, each scraper group comprises a front scraper and a rear scraper, and the scrapers are made of tetrafluoro plates.
Specifically, 5 scraper groups are arranged on the upper end face of the supporting plate, a front scraper and a rear scraper of each scraper group are respectively located on the front side and the rear side of 5 filter discs, the front scraper and the rear scraper of each scraper group are respectively connected to the front side and the rear side of each filter disc in an abutting mode, and the blanking holes are located between two adjacent scraper groups on the supporting plate.
Furthermore, an auger extending along the front-back direction is arranged in the lower shell, the rear end of the auger extends out of the lower shell, and a second motor is arranged at the rear end of the auger.
Furthermore, be equipped with the clear liquid on the suction pipeline and take out the control valve, the bottom in thickener clear liquid storage tank is stretched into to the bottom of suction pipeline, still is equipped with thickener cleaning tube on the suction pipeline, is equipped with thickener cleaning valve on the thickener cleaning tube, and thickener cleaning tube connects high temperature hot water outward.
Further, a first liquid inlet pipe of the first cavity is communicated with a liquid outlet end at the bottom of the thickener filtering and backwashing storage tank through a backwashing pipeline;
the liquid inlet end of the coarse adipic acid thickener is arranged at the top end of the upper shell, the top end of the upper shell is also provided with an exhaust port end and a reflux port end, and the exhaust port end is communicated with the gas inlet end of the thickener gas-liquid separation tank through an exhaust pipe;
the reflux opening end is communicated with the reflux opening end at the top end of the crude adipic acid slurry storage tank through a pipeline.
Furthermore, a float type liquid level meter is arranged on the right side of the crude adipic acid thickener, and the top end and the bottom end of the float type liquid level meter are communicated with the upper shell of the crude adipic acid thickener; because the adipic acid solution has the characteristic of easy crystallization, in order to ensure the liquid level stability of the coarse adipic acid slurry in the coarse adipic acid thickener, the float type liquid level meter is prevented from causing the failure of the liquid level meter due to crystallization blockage, the right side of the float type liquid level meter is also provided with a hot water flushing pipeline, the hot water flushing pipeline is communicated with the float type liquid level meter, and the hot water flushing pipeline is provided with a hot water flushing control valve.
Furthermore, a thickener clear liquid pump is arranged on a pipeline connecting the thickener clear liquid storage tank and the thickener filtering and beating backwashing storage tank.
Further, the thickener is strained the top of clapping the backwash storage tank and is still equipped with first liquid return end, and the thickener is strained the first liquid return end that claps backwash storage tank top and is linked together through pipeline and thickener clear solution storage tank top.
Further, the bottom end of the absorption tower is provided with a collecting pipe, the top end of the absorption tower is provided with an exhaust pipe, the side wall of the absorption tower is provided with a liquid return pipe and an inlet pipe, a collecting tank is arranged below the absorption tower, the collecting pipe extends downwards and extends into the collecting tank, the exhaust end is communicated with the inlet end of an induced draft fan through a pipeline, the top end of the induced draft fan is emptied, the inlet pipe is externally connected with industrial water, and the liquid return pipe is communicated with a crude adipic acid slurry storage tank through a pipeline.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, the coarse adipic acid thickener is added in the coarse adipic acid slurry continuous thickening system, the coarse adipic acid dissolving tank, the thickener clear liquid storage tank, the thickener filtering backwashing storage tank, the thickener gas-liquid separation tank and the coarse adipic acid thickener are connected in series for use, and the DCS control module is adopted to increase the automation degree of the system, so that the separation of clear liquid in the coarse adipic acid slurry can be realized, and adipic acid crystals in the coarse adipic acid slurry can be concentrated and separated.
This system accounts for area less, realizes the separation and the densification of material easily, increases backwash equipment simultaneously, utilizes the clear solution that the thickener was taken out to carry out the backwash to straining the filter cake of clapping, ensures that the material component is stable in the thickener, does not introduce new impurity, has improved product quality, and backwash head tank liquid level is stable, has guaranteed to strain and claps the backwash effect, has ensured equipment steady operation.
The thickener in the system has high operation flexibility, the processing capacity is between 0 and 80t/h, and the thickener is continuous thickening equipment and meets the operation requirements of a single centrifuge and a plurality of centrifuges.
Drawings
FIG. 1 is a schematic diagram of a continuous thickening system for a crude adipic acid slurry as described in example 1;
FIG. 2 is a front view of a crude adipic acid thickener;
FIG. 3 is a rear cross-sectional view of a coarse adipic acid thickener;
FIG. 4 is a front view of a cylindrical dispenser;
FIG. 5 is a left side cross-sectional view of a crude adipic acid thickener;
in the figure: 1 is a crude adipic acid thickener, 2 is a crude adipic acid slurry storage tank, 3 is a centrifuge, 4 is a thickener gas-liquid separation tank, 5 is a thickener filter flap backwash storage tank, 6 is an absorption tower, 7 is an induced draft fan, 8 is a thickener clear liquid storage tank, 9 is a crude adipic acid dissolving tank, 10 is a crude adipic acid slurry pump, 11 is a thickener clear liquid pump, 12 is a thickener feed control valve, 13 is a float type level gauge, 14 is a clear liquid extraction control valve, 15 is a thickener cleaning valve, 16 is a packing auger, 21 is an upper shell, 22 is a liquid inlet end, 23 is an exhaust port end, 24 is a filter disc, 25 is a shaft sleeve, 26 is a main shaft, 27 is a first motor, 28 is a scraper blade group, 31 is a lower shell, 32 is a packing auger, 33 is a collection port end, 34 is a second motor, 41 is a cylindrical distributor, 42 is a first liquid outlet pipe, 43 is a first liquid inlet pipe, 44 is a support frame, 45 is a first liquid inlet cavity, and 46 is a second cavity, 47 is a first circular hole, 48 is a third cavity.
Detailed Description
The utility model is further illustrated, but not limited, by the following examples and the accompanying drawings.
In the description of the present invention, it should be noted that, for the orientation words, such as the terms "height", "left", "right", "horizontal", "vertical", etc., indicating the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, is only for convenience of description and simplification of description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and is not to be construed as limiting the specific scope of the present invention.
It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
Example 1
As shown in fig. 1, a crude adipic acid slurry continuous thickening system comprises a crude adipic acid slurry storage tank 2, a crude adipic acid thickener 1, a centrifuge 3, a crude adipic acid dissolving tank 9, a thickener clear liquid storage tank 8, a thickener filtering and beating backwashing storage tank 5, a thickener gas-liquid separation tank 4, an absorption tower 6 and a draught fan 7;
the top end of the crude adipic acid slurry storage tank 2 is provided with an input pipe, the bottom end of the input pipe extends into the crude adipic acid slurry storage tank 2, and the input pipe is used for inputting the crystallized crude adipic acid slurry into the crude adipic acid slurry storage tank 2 and storing the crystallized crude adipic acid slurry;
the outlet end of the bottom of the crude adipic acid slurry storage tank 2 is communicated with the liquid inlet end of the crude adipic acid thickener 1 through a pipeline, and a crude adipic acid slurry pump 10 and a thickener feeding control valve 12 are arranged on the pipeline through which the crude adipic acid slurry storage tank 2 is communicated with the crude adipic acid thickener 1.
As shown in fig. 2 to 5, the crude adipic acid thickener 1 includes an upper casing 21, a lower casing 31, and a cylindrical dispenser 41 disposed at the rear side of the upper casing 21;
the upper shell 21 is a cuboid box structure extending along the front-back direction, and the lower shell 31 is a funnel-shaped box structure extending along the front-back direction, so that sedimentation of coarse adipic acid particles is facilitated, and thickening of coarse adipic acid slurry is accelerated;
the top end of the lower shell 31 is communicated with the bottom end of the upper shell 21, and a supporting plate is arranged at the joint of the bottom end of the upper shell 21 and the lower shell 31;
a main shaft 26 extending along the front-back direction is arranged in the upper shell 21, a shaft sleeve 25 is arranged outside the main shaft 26, the shaft sleeve 25 is hollow to form a cavity, a plurality of filter discs 24 extending along the radial direction of the main shaft are arranged outside the shaft sleeve 25, the front end of the main shaft 26 extends out of the upper shell 21, a first motor 27 is arranged at the front end of the main shaft 26, 5 filter discs 24 are arranged in the embodiment, the 5 filter discs 24 are sequentially arranged along the front-back direction, the thickness of each filter disc 24 is 50mm, each filter disc 24 is composed of 8 independent fan-shaped filter beats, the size of each fan-shaped filter beat is 1/8 of the size of the filter disc, the 8 fan-shaped filter beats are sequentially connected and arranged along the circumference, two adjacent fan-shaped filter beats are separated by a partition plate, one end, close to the shaft sleeve, of each fan-shaped filter beat is communicated with the shaft sleeve, the front side and the rear side of each fan-shaped filter beat are composed of metal nets, and the aperture of through holes on the metal nets is 2000 meshes;
the cylindrical distributor 41 is a hollow cylindrical structure, the cylindrical distributor 41 is divided into three cavities by three partition plates extending along the axial direction of the cylindrical distributor 41 in the cylindrical distributor 41, specifically, a first cavity 45 occupying 1/8 of the volume of the cylindrical distributor, a second cavity 46 occupying 1/8 of the volume of the cylindrical distributor, and a third cavity 48 occupying 6/8 of the volume of the cylindrical distributor, the first cavity 45 is positioned at the lower part in the cylindrical distributor 41, and the second cavity 46 is adjacent to the first cavity 45; the third chamber 48 is a suction zone, the first chamber 45 is a backwash zone, and the second chamber 46 is a discharge zone; the cylindrical dispenser 41 is fixed to the rear side of the upper case 21 by a support bracket 44;
the front side of the cylindrical distributor 41 is provided with 8 first circular holes 47, the 8 first circular holes 47 are arranged along the circumference, wherein one first circular hole 47 is communicated with the first cavity 45, one first circular hole 47 is communicated with the second cavity 46, and six first circular holes 47 are communicated with the third cavity 48;
the rear end of the shaft sleeve 25 extends out of the upper shell 21, 8 second round holes which are the same as the first round holes 47 are formed in the rear end of the shaft sleeve 25, the second round holes are the same as the 8 first round holes 47 in the front side of the cylindrical distributor 41 in size and correspond to the 8 first round holes 47 in position, and the second round holes are abutted to the 8 first round holes 47;
the upper end face of the supporting plate is provided with a plurality of scraper groups 28, each scraper group 28 comprises a front scraper and a rear scraper, the scrapers are made of tetrafluoro plates, specifically, in the embodiment, 5 scraper groups 28 are provided, the front scraper and the rear scraper of each scraper group 28 are respectively positioned on the front side and the rear side of 5 filter discs 24, specifically, the front scraper and the rear scraper of each scraper group 28 are respectively abutted to the front side and the rear side of each filter disc 24, and a blanking hole is formed between two adjacent scraper groups on the supporting plate;
an auger 32 (a spiral conveyor) extending in the front-back direction is arranged in the lower shell 31, the rear end of the auger 32 extends out of the lower shell 31, and a second motor 34 is arranged at the rear end of the auger 32;
the third cavity 48 is provided with a first liquid outlet pipe 42, and the first cavity 45 is provided with a first liquid inlet pipe 43;
the first liquid outlet pipe 42 of the third cavity 48 is communicated with the inlet end of the thickener clear liquid storage tank 8 through a suction pipeline, a clear liquid extraction control valve 14 is arranged on the suction pipeline, the bottom end of the suction pipeline extends into the inner bottom end of the thickener clear liquid storage tank 8 in the embodiment, a thickener cleaning pipeline is further arranged on the suction pipeline, a thickener cleaning valve 15 is arranged on the thickener cleaning pipeline, and the thickener cleaning pipeline is externally connected with high-temperature hot water;
a first liquid inlet pipe 43 of the first cavity 45 is communicated with a liquid outlet end at the bottom of the thickener filtering and backwashing storage tank 5 through a backwashing pipeline, and a discharging area is in a closed state and no liquid enters;
the liquid inlet end 22 of the coarse adipic acid thickener 1 is arranged at the top end of the upper shell 21, meanwhile, the top end of the upper shell 21 is also provided with an exhaust port end 23 and a backflow port end, and the exhaust port end 23 is communicated with the air inlet end of the thickener gas-liquid separation tank 4 through an exhaust pipe;
the reflux opening end is communicated with the reflux opening end at the top end of the crude adipic acid slurry storage tank 2 through a pipeline;
the bottom end of the lower shell 31 is provided with a collecting port end 33, the collecting port end 33 is communicated with the liquid inlet end at the top of the centrifuge 3 through a pipeline, and the liquid outlet end at the bottom of the centrifuge 3 is communicated with the crude adipic acid dissolving tank 9 through a pipeline;
a float-type liquid level meter 13 is further arranged on the right side of the crude adipic acid thickener 1, the top end and the bottom end of the float-type liquid level meter 13 are both communicated with an upper shell 21 of the crude adipic acid thickener 1, specifically, in the embodiment, the top end of the float-type liquid level meter 13 is communicated with an exhaust pipe; because the adipic acid solution has the characteristic of easy crystallization, in order to ensure the stable liquid level of the crude adipic acid slurry in the crude adipic acid thickener 1 and prevent the liquid level meter from malfunctioning due to crystallization blockage of the float type liquid level meter 13, a hot water washing pipeline is also arranged on the right side of the float type liquid level meter 13, the hot water washing pipeline is communicated with the float type liquid level meter 13, and a hot water washing control valve is arranged on the hot water washing pipeline;
in order to be more convenient to use and increase the automation degree of the system, the float-type liquid level meter 13, the thickener feeding control valve 12 and the hot water flushing control valve are controlled in a cascade mode through the DCS control module to realize the regulation and control of the liquid inlet quantity of the crude adipic acid thickener 1, and the float-type liquid level meter 13 can be controlled to be flushed at regular time.
In the embodiment, the crude adipic acid thickener 1 adopts a thickener of mitsubishi corporation, model F-20, and the specific structure involved in the process of performing crude adipic acid thickening by the crude adipic acid thickener 1 is specifically described in the embodiment, but the specific description of the crude adipic acid thickener 1 cannot be understood as a limitation on the structure, and other components of the crude adipic acid thickener 1 only need to be common components in the prior art, and are not the points of the utility model, and thus, the description is omitted.
The liquid outlet end at the bottom of the thickener clear liquid storage tank 8 is communicated with the inlet end at the bottom of the thickener filtering and beating backwashing storage tank 5 through a pipeline, and a thickener clear liquid pump 11 is arranged on the pipeline connecting the thickener clear liquid storage tank 8 and the thickener filtering and beating backwashing storage tank 5;
in order to ensure the integrity of the crude adipic acid particles and reduce the power consumption of the device, the crude adipic acid thickener 1 is positioned at the height of 15 meters, the clear liquid storage tank 8 of the thickener is positioned at the height of 0 meter of the device, and the separation of clear liquid is completed by a potential difference siphon principle.
Thickener is strained and is clapped backwash storage tank 5's top and is equipped with out liquid end and first liquid end of returning, thickener is strained and is clapped backwash storage tank 5's bottom and be equipped with the second and return the liquid end, thickener is strained the play liquid end at 5 tops of clapping backwash storage tank and is linked together through the feed liquor end of pipeline with thickener gas-liquid separation jar 4, thickener is strained and is clapped the first liquid end of returning at 5 tops of backwash storage tank and be linked together through pipeline and 8 tops of thickener clear solution storage tank, thickener is strained the second that claps backwash storage tank 5 bottoms and returns the liquid end and be linked together through pipeline and thick adipic acid thickener 1's last casing.
The outlet end of the thickener gas-liquid separation tank 4 is communicated with the inlet end of the absorption tower 6 through a pipeline; 6 bottoms of absorption tower are equipped with the collecting pipe, and 6 tops of absorption tower are equipped with the blast pipe, and the lateral wall of absorption tower 6 is equipped with back liquid pipe and inlet tube, and 6 below of absorption tower are equipped with the collecting vat, and collecting pipe downwardly extending is linked together through the entry end of pipeline with draught fan 7 in stretching into the collecting vat, and the exhaust end is linked together through the pipeline, and the top of draught fan 7 is emptied, the external industrial water of inlet tube, back liquid pipe is linked together through pipeline and coarse adipic acid thick liquids storage tank 2.
The thickening process carried out by using the crude adipic acid slurry continuous thickening system comprises the following specific steps:
1. the method comprises the steps of storing a crude adipic acid slurry treated by a crude adipic acid crystallizer as a raw material in a crude adipic acid slurry storage tank 2, wherein the concentration of nitric acid in the crude adipic acid slurry is about 15-35wt%, the concentration of crude adipic acid is about 10-25wt%, starting a crude adipic acid slurry pump 10, sending the crude adipic acid slurry into a liquid inlet end 22 of an upper shell 21 of a crude adipic acid thickener 1 through the crude adipic acid slurry pump 10, filling the crude adipic acid slurry into the upper shell 21 of the crude adipic acid thickener 1, monitoring the feeding amount by a float type liquid level meter 13, and transmitting the feeding amount data to a DCS control module, wherein the DCS control module controls the opening or closing of a feeding control valve 12 of the thickener through the feeding amount of the crude adipic acid slurry to realize that quantitative crude adipic acid slurry enters the crude adipic acid thickener 1;
clear liquid in the crude adipic acid slurry entering the upper shell of the crude adipic acid thickener 1 enters a cavity of a shaft sleeve 25 through a fan-shaped filtering through hole of each filtering disc 24, simultaneously, 5 groups of filtering discs 24 in the crude adipic acid thickener 1 are driven by a first motor 27 and the shaft sleeve 25 to run at a constant speed of 0.5-3 rpm per minute, each rotation is one circle, when a second round hole at the rear end of the shaft sleeve 25 is opposite to a first round hole 47 at the front side of a cylindrical distributor 41, clear liquid in the crude adipic acid slurry enters the cylindrical distributor 41, when the clear liquid in the crude adipic acid slurry enters a third cavity 48 (a suction area), a clear liquid extraction control valve 14 is opened, the clear liquid in the crude adipic acid slurry enters a thickener clear liquid storage tank 8 through a suction pipeline, the concentration of nitric acid in the clear liquid is 20-40wt%, the concentration of the crude adipic acid is below 1wt%, and a large number of crude adipic acid particles are attached to the surface of the filtering discs 24, finishing the preliminary separation work of the crude adipic acid slurry;
clear liquid from a thickener clear liquid storage tank 8 is sent into a thickener filter disc 24 backwashing storage tank 5 through a thickener clear liquid pump 11, clear liquid in the thickener filter beating backwashing storage tank 5 enters a first cavity 45 (backwashing area) through a backwashing pipeline, then when a second round hole at the rear end of a shaft sleeve 25 is opposite to a first round hole 47 at the front side of a cylindrical distributor 41, clear liquid existing in the first cavity 45 (backwashing area) enters the filter disc 24 through a cavity of the shaft sleeve 25 and then enters an upper shell 21 of the crude adipic acid thickener 1, and the cavity of the shaft sleeve 25 and crude adipic acid crystals attached to the surface of the filter disc 24 are cleaned for one time;
with the 5 groups of filter discs 24 rotating under the drive of the first motor 27 and the shaft sleeve 25, the front scrapers and the rear scrapers on the front side and the rear side of each filter disc 24 hang off coarse adipic acid crystal particles on the surface of the filter disc 24 and gradually sink into the lower shell of the coarse adipic acid thickener 1, the second motor 34 drives the packing auger 32 to rotate and concentrate the coarse adipic acid crystal particles to obtain coarse adipic acid slurry with the concentration of 30-50wt%, and finally the concentrated coarse adipic acid slurry enters the centrifuge 3 from the collection port end 33 at the bottom end of the lower shell 31;
in order to ensure that the concentration of the crude adipic acid slurry in the lower shell 31 at the bottom of the crude adipic acid thickener 1 can reach 30-50wt%, the structure of the crude adipic acid thickener 1 is designed to be a frame-type structure with a large upper space, wherein the height of the upper shell 21 is about 1200mm, the height of the lower shell 31 is more than 2.5 times of the height of the upper shell 21, the height of the lower shell 31 is about 3100mm in the embodiment, the height of the lower shell 31 is greater than the height of the upper shell 21, sedimentation of crude adipic acid particles is facilitated, the lower slurry is less, and the thickening efficiency of the crude adipic acid thickener 1 can be improved;
2. the crude adipic acid slurry entering a centrifuge 3 is separated by the centrifuge to form a crude adipic acid filter cake with the concentration of more than 90wt%, the filtrate enters a crude adipic acid dissolving tank 9, hot water is added to form crude adipic acid with the concentration of 40-60wt% for dissolving, and a subsequent adipic acid purification process is carried out;
3. as the slurry in the crude adipic acid slurry storage tank 2 contains a large amount of nitric acid solution, in order to avoid the leakage of nitrite gas in the thickening process, the crude adipic acid slurry continuous thickening system is provided with an induced draft fan 7, the induced draft fan 7 enters a thickener gas-liquid separation tank 4 from an exhaust port end at the top of an upper shell through an exhaust pipe through a trace amount of nitrite gas (the concentration is about 1 wt%) volatilized in the crude adipic acid slurry storage tank 2 and the crude adipic acid thickener 1, the nitrite gas is subjected to gas-liquid separation and then is introduced into an absorption tower 6, the nitrite gas is absorbed by industrial water and enters the crude adipic acid slurry storage tank 2 through a liquid return pipe, and the nitric acid is recovered.
The application further provides a cleaning operation of the crude adipic acid thickener 1, which comprises the following specific steps:
as the operation time of the crude adipic acid thickener 1 is prolonged, the upper part of the filter disc 24 is adhered with a part of crude adipic acid particles which cannot be removed, in this case, the power for operating the first motor 27 is increased, and the stable operation of the equipment is seriously influenced.
Aiming at the situation, an automatic cleaning time sequence of the crude adipic acid thickener 1 is set, when cleaning is needed, an operator closes a thickener feeding control valve 12 connected with the crude adipic acid thickener 1, closes a thickener cleaning valve 15, and gradually sends the materials remained in the crude adipic acid thickener 1 to a lower centrifuge 3 under the condition that the crude adipic acid thickener 1 is not fed and extracted, when the liquid level of the material in the crude adipic acid thickener 1 is lower than 60% of the volume, a cleaning time sequence is put into use, the thickener cleaning valve 15 is opened, high-temperature hot water enters the cylindrical distributor and the shaft sleeve from the thickener cleaning pipeline through the suction pipeline and then enters the inside of the filter frame, the filter frame is cleaned from inside to outside, the temperature of the hot water is kept above 85 ℃ and higher than the solubility of adipic acid in the hot water, the cleaning time is kept above 900S, the cleaning is carried out once every 10 days, and after the cleaning is finished, the valve is reset and fed again.
The DCS control module and the connection relation between the DCS control module and each component in the system are realized by adopting the prior art, are not the utility model point of the utility model and are not described again.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A continuous thickening system for crude adipic acid slurry is characterized by comprising a crude adipic acid slurry storage tank, a crude adipic acid thickener, a centrifugal machine, a crude adipic acid dissolving tank, a thickener clear liquid storage tank, a thickener filtering and backwashing storage tank, a thickener gas-liquid separation tank, an absorption tower and a draught fan;
the outlet end of the bottom of the crude adipic acid slurry storage tank is communicated with the liquid inlet end of the crude adipic acid thickener through a pipeline;
the crude adipic acid thickener comprises an upper shell, a lower shell and a cylindrical distributor arranged at the rear side of the upper shell;
the top end of the lower shell is communicated with the bottom end of the upper shell, a supporting plate is arranged at the joint of the bottom end of the upper shell and the lower shell, and a discharging hole is formed in the supporting plate;
a main shaft extending along the front-back direction is arranged in the upper shell, a shaft sleeve is arranged outside the main shaft, a cavity is formed by the shaft sleeve in a hollow mode, a plurality of filter discs extending along the radial direction of the main shaft are arranged outside the shaft sleeve, the front end of the main shaft extends out of the upper shell, a first motor is arranged at the front end of the main shaft,
the cylindrical distributor is a hollow cylindrical structure, the cylindrical distributor is divided into three cavities by three clapboards extending along the axial direction of the cylindrical distributor,
a plurality of first round holes are formed in the front side of the cylindrical distributor and communicated with the three cavities respectively;
the rear end of the shaft sleeve is provided with a plurality of second round holes which are the same as the first round holes, the second round holes are the same as the first round holes in size and correspond to the first round holes in position, and the second round holes are abutted against the first round holes;
the third cavity is provided with a first liquid outlet pipe, and the first cavity is provided with a first liquid inlet pipe;
a first liquid outlet pipe of the third cavity is communicated with the inlet end of the thickener clear liquid storage tank through a suction pipeline;
the first liquid inlet pipe of the first cavity is communicated with the liquid outlet end at the bottom of the thickener filtering and backwashing storage tank through a backwashing pipeline;
the bottom end of the lower shell is provided with a collecting port end which is communicated with a liquid inlet end at the top of the centrifugal machine through a pipeline, and a liquid outlet end at the bottom of the centrifugal machine is communicated with the crude adipic acid dissolving tank through a pipeline;
the liquid outlet end at the bottom of the thickener clear liquid storage tank is communicated with the inlet end at the bottom of the thickener filtering and backwashing storage tank through a pipeline;
the top of the thickener filter flap backwashing storage tank is provided with a liquid outlet end, the bottom of the thickener filter flap backwashing storage tank is provided with a second liquid return end, the liquid outlet end at the top of the thickener filter flap backwashing storage tank is communicated with the liquid inlet end of the thickener gas-liquid separation tank through a pipeline, and the second liquid return end at the bottom of the thickener filter flap backwashing storage tank is communicated with the upper shell of the crude adipic acid thickener through a pipeline;
the outlet end of the thickener gas-liquid separation tank is communicated with the inlet end of the absorption tower through a pipeline.
2. The continuous thickening system of crude adipic acid slurry according to claim 1, wherein a crude adipic acid slurry pump and a thickener feed control valve are arranged on a pipeline connecting the crude adipic acid slurry storage tank and the crude adipic acid thickener.
3. The continuous thickening system for crude adipic acid slurry according to claim 1, wherein 5 filter discs are provided, the 5 filter discs are sequentially arranged in the front-back direction, each filter disc is composed of 8 independent fan-shaped filter beats, the 8 fan-shaped filter beats are sequentially arranged along the circumference in a connected manner, two adjacent fan-shaped filter beats are spaced by a partition plate, one end of each fan-shaped filter beat, which is close to a shaft sleeve, is communicated with the shaft sleeve, and the front side and the rear side of each fan-shaped filter beat are composed of metal meshes;
the three cavities of the cylindrical distributor are specifically a first cavity occupying 1/8 of the volume of the cylindrical distributor, a second cavity occupying 1/8 of the volume of the cylindrical distributor and a third cavity occupying 6/8 of the volume of the cylindrical distributor, the first cavity is positioned at the lower part in the cylindrical distributor, and the second cavity is adjacent to the first cavity; the third cavity is a suction area, the first cavity is a backwashing area, and the second cavity is a discharging area; the cylindrical distributor is fixed at the rear side of the upper shell through a support frame;
the front side of the cylindrical distributor is provided with 8 first round holes, the 8 first round holes are arranged along the circumference, one first round hole is communicated with the first cavity, one first round hole is communicated with the second cavity, and six first round holes are communicated with the third cavity;
the rear end of the shaft sleeve extends out of the upper shell, 8 second round holes which are the same as the first round holes are formed in the rear end of the shaft sleeve, the second round holes are the same as the 8 first round holes in the front side of the cylindrical distributor in size and correspond to the 8 first round holes in position, and the second round holes are in abutting joint with the 8 first round holes.
4. The continuous thickening system for the crude adipic acid slurry according to claim 1, wherein the upper end surface of the supporting plate is provided with a plurality of scraper groups, each scraper group comprises a front scraper and a rear scraper, the front scraper and the rear scraper of each scraper group are respectively positioned on the front side and the rear side of each filter disc, the front scraper and the rear scraper of each scraper group are abutted against the front side and the rear side of each filter disc, and the blanking hole is positioned between two adjacent scraper groups on the supporting plate.
5. The continuous thickening system of crude adipic acid slurry according to claim 1, wherein the lower housing is provided with an auger extending in a front-rear direction, a rear end of the auger extends out of the lower housing, and a second motor is provided at the rear end of the auger.
6. The system of claim 1, wherein the suction line is provided with a clear solution suction control valve, the bottom end of the suction line extends into the bottom end of the clear solution storage tank of the thickener, the suction line is further provided with a thickener cleaning pipeline, and the thickener cleaning pipeline is provided with a thickener cleaning valve.
7. The continuous thickening system for crude adipic acid slurry according to claim 1, wherein a first liquid inlet pipe of the first cavity is communicated with a liquid outlet end at the bottom of a thickener filtering and backwashing storage tank through a backwashing pipeline;
the liquid inlet end of the coarse adipic acid thickener is arranged at the top end of the upper shell, the top end of the upper shell is also provided with an exhaust port end and a reflux port end, and the exhaust port end is communicated with the gas inlet end of the thickener gas-liquid separation tank through an exhaust pipe;
the reflux opening end is communicated with the reflux opening end at the top end of the crude adipic acid slurry storage tank through a pipeline.
8. The continuous thickening system of crude adipic acid slurry according to claim 1, wherein a float level gauge is further disposed on the right side of the crude adipic acid thickener, and the top end and the bottom end of the float level gauge are both communicated with the upper shell of the crude adipic acid thickener.
9. The continuous thickening system for crude adipic acid slurry according to claim 1, wherein a thickener clear liquid pump is arranged on a pipeline connecting the thickener clear liquid storage tank and the thickener filter backwash storage tank.
10. The continuous thickening system for the crude adipic acid slurry according to claim 1, wherein an exhaust pipe is arranged at the top end of the absorption tower, a liquid return pipe is arranged on the side wall of the absorption tower, the exhaust end is communicated with the inlet end of an induced draft fan through a pipeline, the top end of the induced draft fan is empty, and the liquid return pipe is communicated with a crude adipic acid slurry storage tank through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122876705.8U CN216259559U (en) | 2021-11-23 | 2021-11-23 | Continuous thickening system for crude adipic acid slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122876705.8U CN216259559U (en) | 2021-11-23 | 2021-11-23 | Continuous thickening system for crude adipic acid slurry |
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| Publication Number | Publication Date |
|---|---|
| CN216259559U true CN216259559U (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122876705.8U Active CN216259559U (en) | 2021-11-23 | 2021-11-23 | Continuous thickening system for crude adipic acid slurry |
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| Country | Link |
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| CN (1) | CN216259559U (en) |
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2021
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