CN212385779U

CN212385779U - Bisphenol A granulation system

Info

Publication number: CN212385779U
Application number: CN202022640691.5U
Authority: CN
Inventors: 侯文宙; 宋伟
Original assignee: Shanghai Ruilan Engineering Technology Co ltd
Current assignee: Shanghai Ruilan Engineering Technology Co ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-01-22
Anticipated expiration: 2030-11-16

Abstract

The utility model relates to a bisphenol A granulation system. The granulation system comprises: the middle position of the top of the tower of the granulation tower is provided with an exhaust port; a plurality of spray inlets are uniformly arranged on the periphery of the exhaust port along the circumference of the tower top; the lower part of the tower body is provided with a gas uniform distributor; the spraying device comprises a plurality of nozzles; the nozzle is arranged above the outer part of the granulation tower and is communicated with the granulation tower through a spray inlet; the nozzle comprises a cavity; one end of the cavity is connected with a bisphenol A molten slurry feeding pipe; a spray plate is arranged below the cavity; and one end of the gas circulating cooling device is connected with the exhaust port, and the other end of the gas circulating cooling device is connected with the gas uniform distributor. The technical problem to be solved is that through the layout design of a gas path and a liquid path, the transverse disturbance of material flow in the tower close to the upper area is reduced; when the annual capacity of a single tower of a granulation system is expanded to 24 ten thousand tons or more, the particle size uniformity of a granulated product is good; meanwhile, the granulation system also has the effects of energy conservation and blockage prevention, thereby being more suitable for practical use.

Description

Bisphenol A granulation system

Technical Field

The utility model relates to an equipment of melting bisphenol A granulation especially relates to a bisphenol A granulation system.

Background

In recent years, bisphenol a has been increasingly demanded as an engineering plastic, and is often used as a raw material for polycarbonate resins. For convenience of supply, bisphenol A can be produced in the form of pellets.

The bisphenol A granulation is to atomize the liquid bisphenol A which is heated and melted in a granulation tower, make the bisphenol A liquid drops and cold nitrogen gas in the granulation tower in countercurrent contact, and then solidify the bisphenol A liquid drops, thereby obtaining the bisphenol A round granular product.

The bisphenol A granulation system in the prior art has the following defects: 1) the single-tower granulation capacity of the granulation tower is limited, and the maximum capacity can only reach 15 ten thousand tons per year; 2) the accumulation state of bisphenol A powder at the bottom of the granulation tower cannot be monitored in real time, so that the bottom of the granulation tower is easily blocked; 3) large nitrogen consumption and high energy consumption.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a bisphenol A granulation system, which aims to solve the technical problem of reducing the transverse disturbance of the logistics in the tower near the upper area through the layout design of a gas path and a liquid path; when the single-tower annual capacity of the bisphenol A granulation system is increased to 24 ten thousand tons or more, the particle size uniformity of the granulated product is good; meanwhile, the granulation system can also save the energy consumption of nitrogen cooling circulation, can timely monitor the tower bottom condition and timely clear away accumulated powder, and has the effect of preventing blockage, thereby being more suitable for practical use.

The purpose of the utility model and the technical problem thereof are realized by adopting the following technical scheme. The foundation the utility model provides a bisphenol A granulation system, it includes:

the granulation tower comprises a tower top and a tower body; an exhaust port is arranged in the middle of the tower top; a plurality of spray inlets are uniformly arranged on the periphery of the exhaust port along the circumference of the tower top; the lower part of the tower body is provided with a gas uniform distributor so as to stabilize the gas entering the tower;

the spraying device comprises a plurality of nozzles; the nozzle is arranged above the outside of the prilling tower and is communicated with the prilling tower through the spray inlet; the nozzle comprises a cavity; one end of the cavity is connected with a bisphenol A molten slurry feeding pipe; a spray plate is arranged below the cavity;

and one end of the gas circulating cooling device is connected with the exhaust port, and the other end of the gas circulating cooling device is connected with the gas uniform distributor, and the gas circulating cooling device is used for purifying and cooling the gas and supplying gas to the bisphenol A granulation system.

The purpose of the utility model and the technical problem thereof can be further realized by adopting the following technical measures.

Preferably, in the bisphenol a granulation system, the diameter of the tower body is 9-10 m; the tower body includes a plurality of tower body sections that connect gradually along the axial, every section the tower body section outside all be provided with multiunit annular reinforcing ring.

Preferably, the bisphenol a granulation system described above, wherein a rigid support structure is provided outside the tower top.

Preferably, in the bisphenol a granulation system, the number of the nozzles is 12 to 18.

Preferably, in the bisphenol a granulation system, the gas uniform distributor is disposed on two opposite sides of the lower part of the tower body; the arc angle of the tower body corresponding to the single side of the gas uniform distributor is 80-95 degrees.

Preferably, the bisphenol a granulation system comprises two sets of gas circulation cooling devices; each set of gas circulation cooling device is provided with an independent blower.

Preferably, the bisphenol a granulation system described above, wherein the gas circulation cooling device comprises:

the dust collector of the granulation tower comprises an inlet, an upper outlet and a lower outlet; the inlet is connected with an exhaust port of the granulation tower;

the dust collecting tank is connected with the lower outlet of the granulation tower dust collector and is used for collecting dust;

a blower comprising an inlet and an outlet; the inlet is simultaneously connected with a lower outlet of the prilling tower dust collector and a fresh gas supply pipe;

and one end of the nitrogen circulating cooler is connected with the outlet of the blower, and the other end of the nitrogen circulating cooler is connected with the gas uniform distributor and is used for cooling the gas conveyed by the blower and conveying the cooled gas to the granulation tower.

Preferably, the bisphenol a granulation system of the preceding paragraph, wherein said nitrogen recycle cooler comprises:

the cooling kettle comprises a hot nitrogen input port and a cold nitrogen output port; the hot nitrogen input port is connected with the outlet of the blower;

the cooling water heat exchanger is arranged in the cooling kettle and is close to the hot nitrogen input port; the flow direction of cooling water in the cooling water heat exchanger is opposite to the flow direction of nitrogen in the cooling kettle;

the chilled water heat exchanger is arranged in the cooling kettle and is close to the cold nitrogen output port; the flow direction of the chilled water in the chilled water heat exchanger is opposite to the flow direction of the nitrogen in the cooling kettle;

the temperature sensor is arranged at the hot nitrogen input port to measure the temperature of the nitrogen entering the cooling kettle;

the flow controllers are respectively arranged at the inlet end of the cooling water heat exchanger, the inlet end of the chilled water heat exchanger and the hot nitrogen input port;

and the control system is respectively connected with the temperature sensor and the flow controllers, controls each flow controller according to the temperature data fed back by the temperature sensor, and adjusts the cooling water flow, the freezing water flow and the hot nitrogen flow so as to enable the temperature of the cooling nitrogen at the cold nitrogen output port to meet the process requirements.

Preferably, the bisphenol a granulation system of the preceding paragraph, wherein the heat exchanger is a finned heat exchanger.

Preferably, in the bisphenol a granulation system, the granulation tower further includes a conical bottom fixedly connected to the tower body; and a detonation device is arranged outside the conical bottom.

Preferably, in the bisphenol a granulation system, a plurality of observation holes are formed in the middle of the tower body; a sight line guide pipe is arranged on the outer side of the observation hole; one end of the sight line guide pipe is connected with the observation hole, and the other end of the sight line guide pipe is provided with an observation window.

Preferably, the bisphenol a granulation system described above, wherein the angle between the sight line guide tube and the vertical direction is related to the slope of the conical bottom surface; the sight line guide tube is substantially perpendicular to the cone bottom surface with a tolerance of ± 10 °.

Preferably, in the bisphenol a granulation system, 4 observation holes and 4 sight guide pipes are symmetrically arranged; the arc angle between two adjacent observation holes is 90 degrees +/-2 degrees.

Preferably, in the bisphenol a granulation system, a lighting device is disposed outside 3 of 4 observation holes for illuminating the cone bottom; and the outer sides of the other 1 observation hole are provided with a camera facility for monitoring the powder of the cone bottom in real time.

Preferably, the bisphenol a granulation system described above, wherein it further comprises a control system; the control system is connected with the camera shooting facility and the detonation device; the camera shooting facility feeds back a real-time monitoring result to the control system; and the control system controls the vibration of the detonation device according to the result and the set process parameters.

Borrow by above-mentioned technical scheme, the utility model provides a bisphenol A granulation system has following advantage at least:

1. the utility model provides a bisphenol A granulation system, which enlarges the radial dimension of a granulation tower to 9-10 meters, so that the capacity of a single tower can reach 24 ten thousand tons/year and above; the tower body of the granulation tower is manufactured in sections, so that the granulation tower is convenient to manufacture, transport and install, and a plurality of groups of reinforcing rings are arranged on the outer side of each section of the tower body to ensure the strength of the granulation tower and reduce the instability risk; the top of the tower is provided with a rigid supporting structure such as profile steel to ensure the deflection of the top surface of the tower, so that bisphenol A streamlines from top to bottom of the tower top can fall in parallel, and cross interference is not generated before the bisphenol A streamlines are solidified to influence the particle size of the particles; the bisphenol A liquid is directionally moved downwards through the arrangement of nozzles in the spraying device; sufficient cooling gas supply is ensured through a double-path blower and gas circulation cooling, and the cooling gas is controlled by a gas uniform distributor, so that the gas entering the tower can be uniformly distributed, the gas is stabilized before entering the tower, and the gas is prevented from generating turbulence in the granulation tower to influence the upward movement of the gas from bottom to top; meanwhile, the gas exhaust port is arranged in the middle of the tower top, so that on one hand, the influence of transverse disturbance between air flow and liquid flow on heat exchange is avoided, on the other hand, the gas in the granulation tower is discharged through the centrally arranged exhaust port after being subjected to steady flow distribution by the distributor, the gas flow direction track in the whole granulation tower is uniformly distributed integrally, the particle heat exchange in the granulation process is uniform, and the particle size is controlled;

2. the utility model provides a bisphenol A granulation system, it is through setting up the nozzle quantity that matches the prilling tower productivity, has still reserved the nozzle of spare duty, and has all set up the push-pull valve in each nozzle department, makes each nozzle all can the independent operation, can not influence each other, has avoided because of the individual nozzle breaks down and need to overhaul and lead to shutting down of whole tower;

3. the utility model provides a bisphenol A granulation system, which is characterized in that a nozzle with a specific structure is designed, on one hand, the flexibility of a spray disc is controlled to ensure that the spray disc can still keep a horizontal state under the pressure action of the nozzle, and the change of the direction of a liquid streamline caused by the flexible deformation of the spray disc is avoided; on the other hand, the distance between the small holes on the spray disk, the axial direction of the small holes and the depth of the small holes are controlled, so that the flow directions of the liquid sprayed out from the small holes are kept parallel to each other, and enough distance is kept between the liquid flow lines, thereby avoiding the cross interference between the liquid flow lines; the special structure of the nozzle enables the liquid flow direction from the top to the bottom of the tower to move downwards in a directional way;

4. the utility model provides a bisphenol A granulation system, its position symmetry near the awl bottom in the body of the tower lower part has set up two gas uniform distributors, through controlling the width (the corresponding camber angle) of gas uniform distributor, makes its area of intercommunication with the granulation tower as big as possible, still can not influence the intensity of granulation tower simultaneously and cause the safety risk; furthermore, a plurality of layers of packing layers are arranged in the tower inlet pipeline, and the turbulence of the gas entering the tower is reduced through the pall rings filled in the packing layers, so that the gas is stabilized; furthermore, the cross section of the tower inlet pipeline of the distributor is set to be a rectangular cross section, so that the strength of the granulation tower is enhanced, the gas entering the tower generates less turbulence phenomenon, and the gas is more favorably directionally ascended;

5. the utility model provides a bisphenol A granulation system, which is provided with two paths of gas circulation cooling circuits, each path is provided with an independent blower, and the gas cooling adopts the mode of series operation of cooling water cooling and chilled water cooling; furthermore, the heat exchanger adopts a fin type high-efficiency heat exchanger; the cooling system is intelligently controlled through a control system, so that the quantity and the temperature of cooling gas supplied by the cooling system are stable, and the normal operation of the granulation tower is guaranteed;

6. the utility model provides a bisphenol A granulation system, which monitors the accumulation of bisphenol A powder at the bottom of a granulation tower in real time by arranging a plurality of observation holes and sight guide pipes in the middle of a tower body; arranging a detonation device outside the cone bottom to remove powder deposits adhered to the cone bottom by vibration; the detonation device is intelligently controlled by the control system to start, so that the problems of blockage of the granulation tower and the like are well solved.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a bisphenol A granulation system proposed by the present invention;

FIG. 2a is a schematic structural view of a granulation tower of the present invention;

FIG. 2b is a schematic structural view of a granulation tower of the present invention;

fig. 3 is a schematic view-from above of the tower top structure of the present invention;

FIG. 4 is a schematic view-side view of the tower top structure of the present invention;

fig. 5 is a schematic view-from above of the lower part (containing gas uniform distributor) structure of the prilling tower of the present invention;

fig. 6 is a schematic structural diagram of the nitrogen gas circulation cooler of the present invention.

Detailed Description

To further illustrate the technical means and effects of the present invention for achieving the intended purpose of the present invention, the following detailed description will be given with reference to the accompanying drawings and preferred embodiments of a bisphenol a granulation system, and the specific embodiments, structures, features and effects thereof according to the present invention.

The utility model provides a bisphenol A granulation system, as shown in figure 1 to figure 6, it includes:

the granulation tower I comprises a tower top 11 and a tower body 12; an exhaust port 111 is arranged in the middle of the tower top 11; a plurality of spray inlets 112 are uniformly arranged on the periphery of the exhaust port 111 along the circumference of the tower top 11; the lower part of the tower body 12 is provided with a gas uniform distributor 13 so as to stabilize the gas entering the tower;

a spraying device comprising a plurality of nozzles 113; the nozzle 113 is arranged above the outside of the first granulation tower and is communicated with the first granulation tower through the spray inlet 112; the nozzle 113 comprises a cavity; one end of the cavity is connected with a bisphenol A molten slurry feeding pipe; a spray plate 1131 is arranged below the cavity;

and one end of the gas circulating cooling device is connected with the gas outlet 111, and the other end of the gas circulating cooling device is connected with the gas uniform distributor 13, and the gas circulating cooling device is used for purifying and cooling the gas and supplying gas to the bisphenol A granulation system.

In the technical scheme, the bisphenol A molten slurry is sprayed down from a nozzle at the top of the tower, and cooling gas enters the granulation tower from a gas uniform distributor at the lower part of the tower and flows upwards in the counter-current manner to exchange heat with the bisphenol A spray, so that the granulation of the bisphenol A is realized.

The technical scheme of the utility model aim at providing the granulation system of a big productivity, its not only embody at the volumetric expansion of prilling tower to the expansion of productivity, need consider moreover because the prilling tower expands the equipment security that brings and the realizability scheduling problem of technology, the utility model discloses an foretell technical scheme has solved the problem of expanding the productivity and bringing, can realize the granulation of bisphenol A, and the particle size parameter of making is good.

The nozzles are annularly arranged on the top of the tower and uniformly arranged along the circumference of the top of the tower, and the exhaust port 111 is arranged in the middle of the top of the tower 11, so that the condition that no transverse material flow exists in an area close to the upper part in the granulation tower is considered, the disturbance of transverse air flow generated by gas in the granulation tower is reduced, the uniform contact between cooling gas and molten bisphenol A liquid drops is ensured in the whole height of the granulation tower, the heat exchange effect between liquid and gas is improved, and the granulation quality and efficiency are improved.

Through CFD (Computational Fluid Dynamics) simulation the utility model discloses a structural design sets up the nozzle in the outside, and when central point put to be the nitrogen gas export, horizontal gaseous interference is very limited in the prilling tower, can satisfy bisphenol A's granulation demand completely.

The gas uniform distributor 13 is arranged when the gas enters the tower, and aims to ensure that the gas entering the tower can uniformly enter the prilling tower, so that the gas concentration and the gas flow rate of each area can be basically consistent, and the cooling gas can flow directionally.

According to the technical scheme, the spray liquid from top to bottom and the airflow from bottom to top can both move directionally by the position arrangement of the nozzle 113 and the exhaust port 111 and the flow stabilizing measure when the gas enters the tower, so that the liquid and the gas are prevented from interfering with each other in the direction of material flow, the uniformity of gas-liquid heat exchange is improved, and the effect of uniform granulation after the capacity is expanded is achieved.

Preferably, the gas circulation cooling device comprises two sets; each set of gas circulating cooling device is provided with an independent blower.

Along with the expansion of granulation productivity, the quantity of bisphenol A molten slurry and cooling gas entering a granulation tower in a certain time is increased. In order to adapt to this kind of change, the technical scheme of the utility model in still optimize gas circulation cooling device's setting, divide two strands of symmetries into the mode of tower with nitrogen gas supply among the prior art by an air-blower and a house steward, change into the nitrogen gas supply and divide two strands of symmetries into the tower by two air-blowers and two house stewards for the nitrogen gas supply that gets into the granulation tower is sufficient, and this granulation system still can reach good granulation effect when enlarging the productivity.

As shown in fig. 2a and fig. 2b, the diameter of the tower body 12 is 9-10 meters; the tower body 12 comprises a plurality of tower body sections 120 which are sequentially connected along the axial direction, and a plurality of groups of annular reinforcing rings 1201 are arranged on the outer side of each tower body section 120.

The size of the granulation tower is expanded, the size of the granulation tower is mainly expanded in the radial direction, and the diameter of the granulation tower can reach 9-10 meters. In order to ensure that the rigidity and the stability of the tower body do not exceed the range of safety requirements, the utility model discloses tower body among the technical scheme adopts segmentation manufacturing process. Firstly, manufacturing tower body sections, arranging a plurality of groups of annular reinforcing rings on the outer side of each section of tower body section, and then fixedly connecting each section of tower body section provided with the annular reinforcing rings to form a whole tower body.

Preferably, a rigid support structure (not shown) is provided on the outside of the tower top 12.

When the diameter of the tower body of the prilling tower is enlarged, the deflection of the tower body may be increased. The tower top is of a planar structure and is also called a flat head. The technical scheme of the utility model in the flat head top at the top of the tower can set up a set of rigidity bearing structure, the utility model one is in the embodiment adopt shaped steel, in order to ensure the amount of deflection at the top of the tower is not transfinite to guarantee the straightness that hangs down of the bisphenol A liquid flow line that jets out from the nozzle, liquid flow line perpendicular to horizontal plane promptly, thereby make top-down's liquid can directional removal, improved granulation system's product quality.

In one embodiment of the utility model, the height of the granulation tower is 34 meters, the diameter of the tower body is 9.4 meters, and the tower body is provided with an annular reinforcing ring; and a group of section steel is arranged on the top of the tower. The productivity of the granulation system can reach more than 30 tons/hour, and the annual output can reach 24 ten thousand tons and more.

Preferably, the number of the nozzles is 12-18.

The number of the nozzles can be adjusted according to the parameters of the nozzles, but in order to ensure that the spray sprayed by the spraying device can be uniformly distributed in the granulation tower, the granulation effect of the granulation system is ensured. The number of the nozzles is preferably 12-18; wherein, all nozzles are not required to be started during the granulation operation, part of the nozzles can be used for standby during maintenance, and 12-14 nozzles are preferably started during the granulation operation.

The molten slurry bisphenol A (a in the attached figure 1) is conveyed to a prilling tower from an upstream stripping tower, the prilling system comprises a feeding main pipe, and the feeding main pipe is respectively provided with a plurality of branch pipes connected with each nozzle; the molten slurry is delivered into the nozzle cavity only through the feeding main pipe and the feeding branch pipe. The spraying device is also provided with a differential pressure meter which is used for adjusting the pressure of the nozzle to control the quantity of the molten slurry sprayed; the excess molten slurry is returned to the upstream stripping tower under the action of the differential pressure gauge, and the bisphenol A entering the nozzle is ejected from the small hole of the nozzle at a proper ejection speed. The granules produced by the granulation system are white and globular solid granules having a diameter of about 1.1 mm. The bisphenol A particles are discharged from the bottom of the granulation tower, qualified bisphenol A particles (b in the attached figure 1) are separated out through a granulation vibrating screen, the bisphenol A particles are sent to a packaging unit through a conveyor, and unqualified products enter an overproof particle box and are recovered.

The nozzle is used for spraying the heated and melted bisphenol A solution to form a group of melted bisphenol A flow lines vertical to the horizontal plane; the streamlines need to be kept parallel to each other as much as possible, and the paths of the streamlines are prevented from interfering with each other before the particles are cooled, so that the phenomenon that small drops of bisphenol A are condensed with each other to influence the particle size of the product is avoided.

The nozzle comprises a cavity; preferably, the cavity is a conical structure which comprises a large end and a small end; the small end is connected with a feeding pipe of the bisphenol A molten slurry; the big end is provided with a spray disk.

The spray plate is a core component of the spray nozzle, and the thickness of the spray plate is only 3-6 mm.

In one embodiment of the present invention, hundreds of spraying plates are densely distributed on the spraying plate

The aperture of (2). The bisphenol A liquid drops flow out of the small holes, and a vertical streamline is naturally formed. What is needed isThe streamline is naturally broken under the action of gravity to form a molten liquid drop with the diameter of about 1.1 mm; in the process of naturally falling, the liquid drops encounter cold nitrogen airflow from bottom to top, are solidified into bisphenol A particles after heat exchange is completed, and finally fall into the conical bin of the granulation tower.

For realizing the utility model discloses a process flow need guarantee to follow must not interfere mutually between hundreds of streamlines that spout the dish and flow, need keep being parallel to each other as far as possible between the streamline to avoid bisphenol A droplet to condense mutually, influence the product particle diameter.

In order to achieve the purpose, the technical scheme of the utility model is injectd the structure and the setting of aperture and the amount of deflection that spouts the dish.

For the limitation of the small holes, firstly, a certain distance needs to be kept between the small holes of the spray disk so as to avoid the mutual interference in the falling process of the streamline; secondly, the axes of the small holes are arranged vertical to the horizontal plane, so that the streamline direction is vertically sprayed downwards; thirdly, the depth of the small holes is not suitable to be too large so as to avoid damaging the initial shape of the streamline.

In one embodiment of the present invention, the spray plate is provided with a plurality of small holes with a diameter of 0.6-0.8 mm; the axes of the small holes are vertical to the horizontal plane; the depth of the small hole is 0.5-3 mm; the distance between the small holes is 13-25 mm.

Because the thickness of the spray disk is very thin, a certain deflection is formed at the center of the spray disk under the action of the operation pressure difference of the nozzle. Due to the existence of initial deflection, the streamline flowing out of the small holes of the spray disk can be ejected in a parabola with a certain angle, so that bisphenol A streamlines can be easily interfered and condensed during the falling process, and therefore, the control of the deflection of the spray disk is one of the core tasks of the design of the spray disk.

In order to reduce the flexibility of the spray disk and strengthen the rigidity of the spray disk, the flexibility of the spray disk is limited, one of the flexibility limits is that the spray disk is made of metal materials such as stainless steel and the like and has certain thickness so as to be difficult to deform; and secondly, a rigid part is arranged at the center of the spray disk and is connected with the cavity in a welding way.

In one embodiment of the present invention, a rigid member is disposed at a middle position of the spray plate.

In one embodiment of the present invention, the rigid member is composed of a section steel and a pipe cap; the section steel is fixedly connected with the spray disk through bolts.

The rigid part can greatly reduce the flexibility of the spray disk, basically ensure that the spray disk can still be positioned on the same horizontal plane under the action of operation pressure difference, and avoid the change of the direction of the sprayed streamline caused by the action of pressure.

Preferably, a filter component is further arranged in the nozzle. The filter element is used for filtering small impurities in the molten bisphenol A to prevent the impurities from blocking the small holes of the spray disk.

Preferably, the filter element comprises a screen skeleton; and the filter screen framework is provided with filter screens with fine meshes.

Preferably, the filter screen framework is arranged in the cavity and positioned above the spray disc; a gasket is arranged between the filter screen framework and the spray plate; the filter screen framework is provided with filter holes; the aperture of the filter hole is larger than that of the small hole on the spray disc; the number and the positions of the filter holes correspond to those of the small holes one by one.

Preferably, the rigid part is arranged above the filter screen framework and is positioned in the center of the rigid part; the rigid part is fixedly connected with the spray disk and the filter screen framework through bolts.

Preferably, the cavity is provided with a first steam jacket; high-temperature steam can be introduced into the first steam jacket, so that the bisphenol A in the cavity of the nozzle is always at a higher temperature, and condensation and deterioration of the bisphenol A in the cavity and the spray disc are avoided.

Preferably, a second steam jacket is arranged outside the first steam jacket; high-temperature steam can be introduced into the second steam jacket, and the whole spraying device is wrapped in a constant-temperature environment to enable the spraying device to operate stably.

In one embodiment of the present invention, the design diameter of the large end of the nozzle is 490mm, the height is approximately 695mm, and the main material is stainless steel S30408.

Preferably, the position of the nozzle connected with the feeding pipe is also provided with a temperature measuring device for monitoring the state of the bisphenol A in the cavity. When the aperture takes place the large tracts of land and blocks up, the temperature of the bisphenol A molten pulp in the cavity can obviously rise, so the accessible is observed the condition that the material blockked up is known to temperature measuring device's reading to can in time discover the problem, in time overhaul, unpack apart the nozzle is in order to wash the aperture of jam.

Preferably, as shown in fig. 2a and 4, a gate valve 115 is disposed between the spray disk 1131 and the spray inlet 112.

The technical scheme of the utility model will nozzle 113 set up in the outside top of prilling tower, and will through spraying entry 112 nozzle 113 with the prilling tower intercommunication (r), make atomizer with the prilling tower can communicate and can cut apart again, so that overhaul nozzle 113.

Each nozzle 113 is provided with a dedicated gate valve 115, so that each nozzle can be independently overhauled without influencing the continuous operation of other nozzles 113. The structural design avoids the risk that the nozzle is arranged in the granulation tower in the prior art, and the device is directly stopped if the nozzle cannot be maintained after being damaged; meanwhile, each nozzle is independently controlled, and scheduling management of a production scheduling department is facilitated.

Due to the structural design of the gate valve, the gate valve needs to be closed when the nozzle is overhauled. The push-pull valve very big, if set up the nozzle then can't arrange the push-pull valve when the central point of top of the tower puts, consequently the technical scheme of the utility model with the gas vent set up in top of the tower intermediate position, nozzle along top of the tower circumference annular set up in the outside of gas vent with the design that the push-pull valve structure set up unanimously.

Preferably, as shown in fig. 2a, 2b and 5, the gas uniform distributor 13 is disposed at two opposite sides of the lower part of the tower 12, and comprises:

a gas inlet 131 for connecting the gas circulation cooling device;

the expanding pipeline 132 comprises a small opening end and a large opening end, and the middle part is uniformly excessive; the small opening end is connected with the gas inlet;

a tower inlet pipeline 133, one end of which is connected with the large opening end and the other end of which is connected with the tower body 12; a packing layer 134 is arranged in the tower inlet pipe 133.

The cross section of the tower inlet pipe 133 is rectangular.

The cross section is set to be a rectangular structure, on one hand, the support and the strength of the joint of the rectangular structure and the tower body are considered, on the other hand, the communication area of the tower inlet gas and the tower body can be increased due to the rectangular structure, the gas uniformly enters the tower, the turbulence is less, and the directional rising of the gas is facilitated.

Preferably, as shown in fig. 5, the body 12 connected to the tower inlet pipe 133 has an arc angle α of 80 ° to 95 ° corresponding to a single side thereof.

The purpose of defining the arc angle is to control the area of communication between the tower inlet duct and the tower body. Generally, the larger the arc angle of the tower inlet pipeline communicated with the tower body is, the more uniform the distribution of tower inlet gas is, and the more favorable the directional movement of the gas from bottom to top is; however, as the arc angle is increased, a larger opening needs to be formed in the lower portion of the tower body, and the performance such as strength of the granulation tower may be affected. The technical scheme of the utility model safety risks such as the intensity of comprehensive consideration prilling tower and the directional flow of tower gas of advancing will be connected the camber angle limit that the tower body unilateral that advances the tower pipeline corresponds is 80 ~95, can realize the better balance of tower body intensity and gaseous even mobility this moment for this granulation system reaches good granulation effect.

Preferably, the filler layer 134 comprises two steel plate meshes arranged oppositely; and a pall ring is filled between the two steel plate nets.

In an embodiment of the present invention, the size model of the steel plate net is ZW × B × 6 × 32 × 2050 × 1650.

Preferably, the filler layer is provided with 1-3 layers.

Preferably, the upper side and the lower side of the packing layer are both provided with an opening and closing component; the used filler is discharged through the lower opening and closing member, and a new filler is put through the upper opening and closing member.

Preferably, as shown in fig. 5, a plurality of supporting frames 135 are arranged in the expanding pipe 132; the supporting frame 135 is fixedly connected with the pipe wall of the expanding pipeline 132; the adjacent support frames 135 are fixedly connected by a reinforcing bar 136.

As shown in fig. 1, the gas circulation cooling device includes:

the dust collecting tank is connected with a lower outlet of the dust collector of the granulation tower and is used for collecting dust;

a blower (iv) including an inlet and an outlet; the inlet is simultaneously connected with a lower outlet of the dust collector of the prilling tower and a fresh gas supply pipe;

one end of the nitrogen circulating cooler is connected with the outlet of the blower, and the other end of the nitrogen circulating cooler is connected with the gas uniform distributor for cooling the gas conveyed by the blower and conveying the cooled gas to the granulation tower.

And some fine bisphenol A in the granulation tower and the cooled nitrogen flow out of the granulation tower through the exhaust port, enter a dust collector of the granulation tower for separation, and finally enter a dust collecting tank for recovery. And inputting the nitrogen separated by the dust collector of the prilling tower and fresh nitrogen into a blower together for compression, then conveying the nitrogen into the nitrogen circulating cooler for cooling, and conveying the nitrogen into the prilling tower for recycling after the nitrogen is cooled to 35 ℃.

Preferably, as shown in fig. 6, the nitrogen gas recirculation cooler includes:

Preferably, the heat exchanger is a finned heat exchanger.

In the technical scheme, the cooling of the circulating nitrogen is realized by adopting a high-efficiency heat exchanger to ensure that the process temperature of the nitrogen after heat exchange is qualified; on the other hand adopts cooling water and refrigerated water combination cooling, and passes through control system intelligent control the scheme of the flow of cooling water, refrigerated water and nitrogen gas realizes the energy-conserving technological effect of wisdom.

Preferably, as shown in fig. 2a and 2b, the prilling tower further comprises a cone bottom 17 fixedly connected with the tower body 12; the outer side of the conical bottom 17 is provided with a detonation device 14.

Bisphenol A powder is very strong and easily bridged, so that part of the powder falls to the bottom of the cone when the liquid-gas heat exchange is insufficient. In order to make the bisphenol A piece fall down easily when being attached to the tower bottom to and can fully clear away the powder deposit at the awl end, the technical scheme of the utility model in the awl end outside set up vibration equipment so that fall to the powder deposit at the awl end and drop.

Preferably, a plurality of observation holes 15 are arranged in the middle of the tower body 12; a sight line guide tube 16 is arranged outside the observation hole 15; one end of the sight line guide tube 16 is connected with the observation hole 15, and the other end is provided with an observation window (not marked in the figure).

In one embodiment of the utility model, the aperture of the observation window is 8 inches.

Preferably, the included angle between the sight line guide tube 16 and the vertical direction is related to the inclination of the surface of the cone bottom 17; the sight line guide tube 16 is substantially perpendicular to the surface of the cone bottom 17, which allows a tolerance of ± 10 °.

Preferably, 4 observation holes 15 and 4 sight line guide pipes 16 are symmetrically arranged; the arc angle between two adjacent viewing apertures 15 is 90 ° ± 2 °.

The observation holes are uniformly distributed on the tower wall of the granulation tower at the same height; the height of the observation hole and the angle of the sight line guide pipe are set so that the whole cone bottom area can be completely observed from the observation window.

Preferably, lighting means (not labeled in the figure) are arranged outside 3 of the 4 observation holes 15 for illuminating the cone bottom; and the outer side of the other 1 observation hole 15 is provided with a camera facility (not marked in the figure) for monitoring the powder at the cone bottom in real time.

Preferably, it further comprises a control system; the control system is connected with the camera shooting facility and the detonation device; the camera shooting facility feeds back a real-time monitoring result to the control system; and the control system controls the vibration of the detonation device according to the result and the set process parameters.

When the bisphenol A powder at the conical bottom of the granulation tower is found to be accumulated to a certain degree, the control system instructs the detonation device to vibrate, so that the bisphenol A powder accumulated at the conical bottom of the granulation tower is separated from the conical bottom and is discharged through a bisphenol A granule outlet at the conical bottom of the granulation kettle.

The technical proposal of the utility model reduces the transverse disturbance of the material flow in the tower near the upper region through the layout design of the gas path and the liquid path; when the single-tower annual capacity of the bisphenol A granulation system is increased to 24 ten thousand tons or more, the particle size uniformity of the granulated product is good; meanwhile, the granulation system can also save the energy consumption of nitrogen cooling circulation, can timely monitor the tower bottom condition and timely clear away accumulated powder, and has the effect of preventing blockage, thereby being more suitable for practical use.

The features of the invention claimed in the claims and/or in the description may be combined, but the combination is not limited to the combination defined in the claims by the reference. The technical solution obtained by combining the technical features in the claims and/or the specification is also the scope of the present invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims

1. A bisphenol a granulation system, comprising:

2. The bisphenol-A pelletizing system of claim 1, characterized in that the diameter of the tower is 9-10 meters; the tower body includes a plurality of tower body sections that connect gradually along the axial, every section the tower body section outside all be provided with multiunit annular reinforcing ring.

3. A bisphenol a granulation system as defined in claim 2, wherein a rigid support structure is provided outside of said tower top.

4. The bisphenol-A granulation system according to claim 1, wherein the number of the nozzles is 12 to 18.

5. The bisphenol a granulation system of claim 1, wherein the gas uniform distributor is disposed on opposite sides of the lower portion of the tower; the arc angle of the tower body corresponding to one side of the gas uniform distributor is 80-95 degrees.

6. The bisphenol a granulation system of claim 1, wherein the gas recycle cooling apparatus comprises two sets; each set of gas circulation cooling device is provided with an independent blower.

7. The bisphenol a granulation system of claim 1, wherein the gas recirculation cooling device comprises:

8. The bisphenol a granulation system of claim 7, wherein the nitrogen recycle cooler comprises:

9. The bisphenol-a granulation system of claim 8, wherein the heat exchanger is a finned heat exchanger.

10. The bisphenol a granulation system of claim 1, wherein the prilling tower further comprises a cone bottom fixedly attached to the tower body; and a detonation device is arranged outside the conical bottom.

11. The bisphenol a granulation system of claim 10, wherein a plurality of sight holes are provided in the middle of the tower body; a sight line guide pipe is arranged on the outer side of the observation hole; one end of the sight line guide pipe is connected with the observation hole, and the other end of the sight line guide pipe is provided with an observation window.

12. The bisphenol-a granulation system of claim 11, wherein the angle between the sight-line guide and the vertical is related to the slope of the conical bottom surface; the sight line guide tube is basically perpendicular to the conical bottom surface, and the allowable error of the sight line guide tube is +/-10 degrees.

13. The bisphenol a granulation system of claim 11, wherein 4 of the sight glass and the sight-line guide tube are symmetrically disposed; the arc angle between two adjacent observation holes is 90 degrees +/-2 degrees.

14. The bisphenol a granulation system of claim 11, wherein out of 4 of the plurality of observation holes, an illumination means is disposed outside of 3 of the plurality of observation holes for illuminating the cone base; and the outer sides of the other 1 observation hole are provided with a camera facility for monitoring the powder of the cone bottom in real time.

15. The bisphenol a granulation system of claim 14, further comprising a control system; the control system is connected with the camera shooting facility and the detonation device; the camera shooting facility feeds back a real-time monitoring result to the control system; and the control system controls the vibration of the detonation device according to the result and the set process parameters.