CN112473564A - Two-way rotary feeder and feeding system for polyolefin solid catalyst - Google Patents
Two-way rotary feeder and feeding system for polyolefin solid catalyst Download PDFInfo
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- CN112473564A CN112473564A CN201910856447.1A CN201910856447A CN112473564A CN 112473564 A CN112473564 A CN 112473564A CN 201910856447 A CN201910856447 A CN 201910856447A CN 112473564 A CN112473564 A CN 112473564A
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- 229920000098 polyolefin Polymers 0.000 title claims abstract description 26
- 239000011949 solid catalyst Substances 0.000 title claims abstract description 26
- 239000003054 catalyst Substances 0.000 claims abstract description 177
- 238000007664 blowing Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 6
- 238000005299 abrasion Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 22
- 239000002245 particle Substances 0.000 abstract description 11
- 230000005484 gravity Effects 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 21
- 230000008569 process Effects 0.000 description 20
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 238000007599 discharging Methods 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 238000006116 polymerization reaction Methods 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012685 gas phase polymerization Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
- B01J8/0045—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor by means of a rotary device in the flow channel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/01—Processes of polymerisation characterised by special features of the polymerisation apparatus used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00743—Feeding or discharging of solids
- B01J2208/00752—Feeding
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention relates to a two-way rotary feeder for polyolefin solid catalyst, which comprises: the catalyst feeding rotary metering valve comprises a two-way distributor (1) and a catalyst feeding rotary metering valve (6), wherein a channel (4) divided into two parts is arranged in the two-way distributor assembly (1), a catalyst is fed by gravity and is equivalently divided into two paths to flow to the catalyst feeding rotary metering valve (6) after entering the two-way distributor (1), the catalyst feeding rotary metering valve (6) comprises a valve body (7) and a ball core (8), 1-4 cavities (9) are uniformly arranged on the ball core (8), after the catalyst flowing out of the two-way distributor (1) is received by the cavity (9) with a certain opening facing upwards, the ball core (8) is rotated to enable the cavity (9) to have the opening facing downwards, and the catalyst flows to a downstream pipeline, so that feeding is realized. Compared with the prior art, the method has the advantages of rapid, uniform and continuous feeding, and no damage to the particle shape of the catalyst.
Description
Technical Field
The invention relates to the technical field of dry powder catalyst feeding, in particular to a two-way rotary feeder and a feeding system for a polyolefin solid catalyst.
Background
The gas phase process of polyolefins is an important component in the production process of polyolefins. At present, the domestic main gas-phase polyethylene process comprises the following steps: unipol gas-phase fluidized bed process of UCC, innoven gas-phase fluidized bed process of BP, GPE gas-phase fluidized bed process of medium petrochemical, and the like. . In the production process, the catalyst is the core of the whole polymerization reaction, and a solid catalyst needs to be added in the Unipol gas-phase fluidized bed process of UCC, the Innovene gas-phase fluidized bed process of BP and the like. In order to ensure stable operation of a polymerization reaction for a long period of time, it is necessary to ensure stable and reliable feeding rate of the solid catalyst, accurate metering, and the like, and thus a solid catalyst feeding system has been developed. The solid catalyst is metered by the solid catalyst feeding system according to the catalyst requirement of the polymerization reactor and is stably and continuously fed into the gas-phase polymerization reactor through a pipeline for conveying. The feeder operation has a direct influence on the plant reactor and the catalyst feed rate is an important parameter of the polymerization reaction which determines the polymerization yield.
At present, a Unipol gas-phase fluidized bed process of UCC, an Innovene gas-phase fluidized bed process of BP, a GPE gas-phase fluidized bed process of medium petrochemical industry and the like are all provided with corresponding solid catalyst feeding systems, but different problems exist in practical application, so that the feeding systems cannot stably operate for a long period, the stability of the catalyst feeding rate is influenced, and further the polymerization reaction is influenced. Common failures of Mark V type dry powder charging system of Unipol gas fluidized bed process of UCC: unstable feeding (forced feeding), blockage of injection tube, shearing of safety pin of feeder protection cylinder. The dispersive feeding system adopted by the Innovene gas-phase fluidized bed of BP has the defects of long flow path and blockage of a feeding pipeline. The dry powder feeder manufactured by China aerospace eleven can be used for a GPE gas phase fluidized bed process of the medium petrifaction and has the defects of unstable feeding (forced feeding), inaccurate metering and pipeline blockage.
Patent CN108203474A discloses a rotary feeder of solid polyolefin catalyst, comprising: the shell is internally provided with a cavity; the surface of the spherical body is provided with a circle of groove, and the spherical body is arranged in the cavity, is tightly attached to the cavity and can roll around a transverse axis in the cavity; and the connecting shaft is arranged on the transverse axis of the sphere, a hole is formed in the position, corresponding to the connecting shaft, of the shell, and the connecting shaft penetrates through the hole. This rotary feeder can appear the inhomogeneous condition of dispersing easily of catalyst at reinforced in-process, this rotary feeder's defect:
1. the particle form of the catalyst is damaged in the feeding process, and because the particle form of the catalyst determines the particle form of the resin, the catalyst particles are broken, the form of a device product is seriously influenced, and the fine powder in the reactor is more;
2. the rotary feeder is only suitable for the rotary feeding of products at normal pressure, the sealing performance of the valve body is influenced due to the fact that a large number of grooves are formed in the ball body, the design pressure is 3.8MPa in the feeding process of the polyethylene catalyst, the sealing performance is critical, materials at the lower part are reversely connected to the upper part of the valve body due to poor sealing performance, feeding is unsmooth, metering is not accurate, and the rotary feeder is not suitable for the working condition of high pressure;
3. the angle of the sphere groove and the sphere inside the feeder is smaller than 90 degrees, in the process of quick rotation, the catalyst of the groove can be sprinkled on the surface of the sphere, the metering is inaccurate, catalyst particles can be remained between the sphere and the sealing surface, and the metal particles in the catalyst are abraded with the sphere and the sealing material for a long time to cause the sealing failure and the leakage.
Disclosure of Invention
The present invention aims at solving the above problems and providing a two-way rotary feeder and a feeding system for solid polyolefin catalyst, which are particularly suitable for feeding solid polyethylene catalyst into a gas-phase ethylene polymerization reactor in a gas-phase fluidized bed process.
The purpose of the invention is realized by the following technical scheme:
a two-way rotary feeder for a polyolefin solid catalyst, the rotary feeder comprising: the catalyst feeding rotary metering valve comprises a valve body and a ball core, a plurality of cavities are uniformly arranged on the ball core, a cavity with an upward opening receives the catalyst flowing out of the two-way distributor, the ball core is rotated to enable the cavity to have an downward opening, and the catalyst flows to a downstream pipeline, so that feeding is realized.
Furthermore, the cross section of the two-way distributor is in an equilateral hexagon shape, a distributing hopper is arranged in the two-way distributor, and the inner cavity of the two-way distributor is uniformly divided into two channels to form an inverted Y-shaped channel.
Furthermore, the distributing hopper is a triangular cone, the cross section of the distributing hopper is triangular, the bottom edge of the distributing hopper is the same as the hexagonal bottom edge of the two-way distributor, and the included angle alpha between a discharging pipeline and the bottom edge of the triangle is larger than 90 degrees and larger than or equal to 60 degrees. The width of the channel is limited by the size of the distribution hopper, so that the catalyst with the same feeding amount can have higher falling speed, and the catalyst can smoothly and quickly fall after being distributed without being left in the distributor.
Furthermore, the thickness of the material distribution hopper is 40-1000mm, and the side length is 40-1000 mm.
Furthermore, a two-way distributor is respectively connected with two catalyst feeding rotary metering valves, the ball core of each catalyst feeding rotary metering valve is arranged in the valve body, a plurality of cavities with fixed volumes are uniformly formed in the ball core along a circle on the circumference, the ball core is connected with an air cylinder through a valve rod, a coupler and a speed reducer, and the air cylinder drives the ball core to rotate so as to drive the cavities of the quantitative metering catalyst to rotate. The cavity volume is fixed, can be used to the feeding volume of accurate measurement catalyst, and the cylinder can drive 360 °, 180 °, 120 °, 90 ° of rotation of ball core and add the material, and the frequency of adding the material can be decided according to the rotational frequency of adjusting the cylinder to reach even, steady, accurate reinforced.
Furthermore, the number of the cavities is 1-4, included angles of 360 degrees, 180 degrees, 120 degrees and 90 degrees are formed between every two adjacent cavities, when the ball core rotates by 360 degrees, 180 degrees, 120 degrees and 90 degrees, the process of feeding and discharging can be completed once, the catalyst can be fed easily regularly at regular time, 1-4 times of feeding and discharging can be performed in one period, and the efficiency is high after 1-4 times of discharging.
Furthermore, wear-resistant materials are adopted for sealing between the ball core and the valve body, so that the valve body can normally operate within 7200 hours without leakage.
A two-way rotary feeder feed system for a polyolefin solid catalyst, the feed system comprising: the two-way rotary feeder comprises a catalyst steel bottle, a catalyst buffer tank and a catalyst feeding tank which are sequentially connected at the upstream of the two-way rotary feeder, and a catalyst filling tank and a reactor which are sequentially connected at the downstream of the two-way rotary feeder. When the catalyst is blown into the reactor by a certain flow of high-pressure blowing nitrogen, the pressure of the high-pressure nitrogen is required to be at least 0.7MPa higher than the pressure of the reactor, so that the catalyst is prevented from remaining in the pipeline and blocking the pipeline by the catalyst.
Furthermore, a first balance pipeline is arranged between the catalyst buffer tank and the catalyst feeding tank, and a second balance pipeline is arranged between the catalyst buffer tank and the catalyst filling tank. The balance pipeline is provided with a balance valve, the pressure intensity of different devices can be controlled through the balance valve, and the conveying speed of the catalyst can be adjusted through the pressure intensity difference.
Furthermore, a first blowing pipeline is arranged between the catalyst steel cylinder and the catalyst buffer tank, a second blowing pipeline is arranged between the catalyst buffer tank and the catalyst feeding tank, a third blowing pipeline is arranged between the catalyst feeding tank and the catalyst filling tank, a fourth blowing pipeline is arranged between the catalyst filling tank and the reactor, and the blowing pipeline transmits the catalyst among different devices.
The two-way rotary feeder combines a two-way distributor and a rotary metering valve for catalyst feeding, the catalyst can be uniformly distributed into each catalyst filling tank through the distributing hopper, and the feeding and the discharging of the catalyst are realized through the ball core which can rotate up and down; the feeding system adopts a two-way feeder to feed materials, so that the solid catalyst can keep the shape of the solid catalyst to enter the reactor, nitrogen is adopted for blowing, the effect is good, and the catalyst is not damaged.
Compared with the prior art, the invention has the following beneficial effects:
(1) the two-way rotary feeder has reasonable design and even material distribution, can feed materials by using gravity more, can avoid the damage to solid polyolefin catalyst particles, protects the catalyst form, has simple structure and good sealing property, and is easy to replace; the feeding system has simple process flow and can realize the purpose of stably and continuously feeding the solid polyethylene catalyst into the gas-phase fluidized bed for a long period and accurately metering.
(2) The distributor is positioned between the KV-3052 and the KV-3053A/KV-3054A at the bottom of the catalyst feeding tank D-3051(17) so as to uniformly distribute the catalyst from the D-3051 tank into the filling tanks 1# and 2# at the bottom (18).
The rotary charging metering ball valve is positioned at the lower part of the No. 1 and No. 2 filling tanks (18), and the installation position distance is shortest to the No. 1 and No. 2 filling tanks (18).
(3) The invention is different from the patent CN 108203474A: 1) according to the distributor added with the catalyst, the traditional one-way feeding is added into the existing two-way feeding, and when one feeder of the device is in failure, the other feeder is in normal operation, so that the normal operation of the device is ensured; 2) compared with a Mark V-shaped feeder, the feeder has the advantages of simple structure, accurate metering, no forced feeding, catalyst particle form protection, low catalyst abrasion, no pipeline blockage of the catalyst, low investment, convenient operation and maintenance, no movable equipment of the whole system, energy conservation and environmental protection;
(4) the feeder of the invention has the main invention points that:
1) a distributor: the catalyst is uniformly distributed into two filling tanks under the condition of other influencing factors;
2) rotating a feeding valve: the metering valve is driven to rotate by the cylinder, and the catalyst is accurately added into the pipeline, so that the particle form of the catalyst is protected, the stable and accurate feeding of the catalyst is ensured, and forced feeding is avoided;
3) the whole system has smooth blanking, does not have the phenomenon of blocking a pipeline, and reduces the operation difficulty;
(5) the system can protect the particle form of the catalyst, and the principle is as follows:
1) the pipeline between the outlet pipeline of the catalyst steel cylinder and the reactor is designed without a right-angle elbow, and the catalyst is conveyed from the steel cylinder to the buffer tank by adopting low-pressure nitrogen, so that the catalyst is ensured not to collide in the conveying process, and the particle form is protected;
2) the catalyst is fed by gravity from the buffer tank to the metering ball valve, so that the flow rate of the catalyst is low and stable;
3) the catalyst has no abrasion in the rotary metering valve, and the catalyst is smoothly added into the pipeline.
Drawings
FIG. 1 is a schematic view of a two-way rotary feeder for a polyolefin solid catalyst;
FIG. 2 is a schematic diagram of the structure of a rotary metering valve for feeding (discharging) catalyst;
FIG. 3 is a schematic diagram of the structure of a two-way feed system for a polyolefin solid catalyst;
FIG. 4 is a partial schematic view of nitrogen control during operation of the feed system.
FIG. 5 is a left schematic view of a two-way rotary feeder for a polyolefin solid catalyst;
in the figure: 1-a two-way distributor; 2-material distributing and feeding port; 3-material distributing and discharging port; 4-channel; 5-a material distribution hopper; 6-rotary metering valve for catalyst feeding; 7-a valve body; 8-a ball core; 9-a cavity; 10-a valve stem; 11-a feed inlet; 12-feeding and discharging port; 13-a cylinder; 14-a coupling; 15-a catalyst steel cylinder; 16-a catalyst surge tank; 17-a catalyst feed tank; 18-a catalyst-filled tank; 19-reactor.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
A two-way rotary feeder for a polyolefin solid catalyst, the rotary feeder comprising: a two-way distributor 1 and a catalyst feeding rotary metering valve 6.
As shown in fig. 1, the cross section of the two-way distributor 1 is an equilateral hexagon, and a distributing hopper 3 is arranged in the two-way distributor, so that the inner cavity of the two-way distributor 1 is uniformly divided into two channels 4 to form an inverted Y-shaped channel. The top of the two-way distributor 1 is provided with a distributing feed inlet 2, and the bottom is provided with two distributing discharge outlets 3 which are communicated with the channel 4. The distributing hopper 3 is a triangular cone, and the bottom edge of the distributing hopper is the same as the hexagonal bottom edge of the two-way distributor 1. The thickness of the material distributing hopper 3 is 40-1000mm, and the side length is 40-1000 mm.
As shown in fig. 2, the catalyst charging rotary metering valve 6 comprises a valve body 7 and a ball core 8, a charging feed inlet 11 is arranged at the top of the valve body 7, a charging discharge outlet 12 is arranged at the bottom of the valve body, the ball core 8 is arranged in the valve body 7, 1-4 cavities 9 with fixed volumes are uniformly arranged on the ball core 8 along a circle of the circumference, the ball core 8 is arranged on the longitudinal axis of the ball core 8, the ball core 8 passes through a valve rod 10, a coupler 14 and a reducer connecting cylinder 13, the ball core 8 is driven to rotate through the cylinder 13, and the cavities 9 for quantitatively metering the catalyst are driven to rotate. Valve rod 10 sets up on the horizontal axis of ball core, and it has a through-hole to open on the valve body 7, holds valve rod 10 and passes through, and the one end of valve rod 10 links to each other with ball core 8, and the other end of valve rod 10 links to each other with the shaft coupling, and valve rod 10 homonymy is all located to cylinder 13 and reduction gear, and wherein cylinder 13 is the frequency conversion cylinder. The number of the cavities 9 is 1-4, and the adjacent cavities 9 form included angles of 360 degrees, 180 degrees, 120 degrees and 90 degrees. The ball core 8 is driven by the air cylinder 13 to rotate by 360 degrees, 180 degrees, 120 degrees and 90 degrees according to a set program, and when the ball core 8 rotates by 360 degrees, 180 degrees, 120 degrees and 90 degrees, the process of feeding and discharging can be completed once. Wherein, wear-resistant material is adopted to seal between the ball core 8 and the valve body 7.
The two-way distributor 1 is respectively connected with two catalyst feeding rotary metering valves 6, when the opening of the cavity 9 faces upwards, the two-way distributor 1 receives the catalyst flowing out of the cavity, and when the opening faces downwards, the catalyst enters a downstream pipeline to realize feeding.
As shown in fig. 3, a feeding system of a two-way rotary feeder for a polyolefin solid catalyst, the feeding system comprising: a two-way rotary feeder, a catalyst steel cylinder 15, a catalyst buffer tank 16 and a catalyst feeding tank 17 connected in sequence at the upstream thereof, and a catalyst filling tank 18 and a reactor 19 connected in sequence at the downstream thereof.
A first balance pipeline is arranged between the catalyst buffer tank 16 and the catalyst feeding tank 17, a second balance pipeline is arranged between the catalyst buffer tank 16 and the catalyst filling tank 18, and a balance valve is arranged on the balance pipeline.
A first blowing pipeline is arranged between the catalyst steel cylinder 15 and the catalyst buffer tank 16, a second blowing pipeline is arranged between the catalyst buffer tank 16 and the catalyst feeding tank 17, a third blowing pipeline is arranged between the catalyst feeding tank 17 and the catalyst filling tank 18, a fourth blowing pipeline is arranged between the catalyst filling tank 18 and the reactor 19, and a blanking valve is arranged on the blowing pipeline.
FIG. 4 is a partial schematic view of nitrogen control with respect to catalyst fill tank 18 to reactor 19 during operation of the feed system.
In particular, the amount of the solvent to be used,
as shown in fig. 3, the discharge unit from the catalyst steel cylinder to the catalyst surge tank (D-3050): the pressure of a dry powder catalyst steel cylinder is increased to 0.4MPa, the pressure of a catalyst buffer tank is reduced, the pressure is controlled to be 100KPa, and the dry powder catalyst is pumped into the catalyst buffer tank (D-3050) from the catalyst steel cylinder through nitrogen.
Feeding unit of catalyst from catalyst surge tank to each catalyst filling tank: when the material level of the catalyst feeding tank (D-3051) is low, the pressure balance valve KV-3050A and the blanking valve KV-3050C are kept in a closed state, the pressure of the D-3050 is set to be the same as that of the D-3051, and at the moment, the D-3050 tank starts to be automatically pressurized. When the pressure of the D-3050 tank and the D-3051 tank is basically the same, the balance valve KV-3050A and other hand valves on the balance pipeline are opened, and the balance pipeline between the D-3050 tank and the D-3051 tank is opened. And opening the blanking valve KV-3050C and other hand valves on the pipeline, and starting to perform blanking through gravity flow. The catalyst in the catalyst feeding tank is uniformly discharged into each catalyst filling tank through the two-way rotary feeder (normally, 2 sets of catalyst injection systems are alternately fed, so that the catalyst feeding tank simultaneously feeds the two catalyst filling tanks, taking the No. 1 and No. 2 filling tanks as an example). And opening balance valves KV-3051, KV-3053B and KV-3054B, and respectively opening pressure balance pipelines of D-3051 to 1# and 2# catalyst filling tanks. And opening the blanking valves KV-3052, KV-3053A and KV-3054A, and starting to blank the corresponding catalyst filling tank from D-3051 by using gravity flow.
Catalyst entering the reaction unit of the reactor: the injection of the catalyst from the storage pipe into the reactor is carried out by a control program. The catalyst was added from the catalyst-filled tank to the corresponding blowing line using a dedicated pneumatic metering valve KV-3053C, KV-3054C. At normal production capacity, 2 sets of catalyst injection systems were fed alternately. The injection should be staged so that simultaneous injections do not occur. During the injection of the catalyst, the catalyst charge rotary metering valve should be filled with the catalyst from the catalyst filling tank and rotated 360 °, 180 °, 120 °, 90 ° to empty the catalyst powder into the corresponding blow line, and if the injection amount of the catalyst is to be changed, the operation speed injection rate of the cylinder may be increased or decreased. The normal speed range is 0-4 injections per minute per line and can be adjusted according to production requirements. Each blow line is equipped with a high pressure nitrogen feed, the nitrogen flow rate must meet design requirements.
And the catalyst buffer tank (D-3050) and the catalyst feeding tank (D-3051) return the residual materials to the catalyst steel cylinder for operation. The root parts of the catalyst buffer tank (D-3050) and the catalyst feeding tank (D-3051) are respectively provided with a three-way hand valve. When the feeding system is overhauled or the catalyst in the D-3050 and D-3051 tanks needs to be cleaned under other conditions, the root three-way hand valve is rotated by 90 degrees, the catalyst return flow is opened, and the residual materials are returned to the catalyst steel cylinder.
As shown in FIG. 4, after the catalyst was discharged from the rotary metering valve for feeding the catalyst, the catalyst was blown into the reactor by high-pressure purified nitrogen gas in the line, the pressure of the high-pressure purified nitrogen gas was 0.7MPa or more higher than the pressure in the reactor, and the flow rate of the high-pressure purified nitrogen gas was set to < 30NM3/h。
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A two-way rotary feeder for solid polyolefin catalysts, characterized in that it comprises: the catalyst feeding rotary metering valve comprises a two-way distributor (1) and a catalyst feeding rotary metering valve (6), wherein a channel (4) divided into two parts is arranged in the two-way distributor (1), the catalyst enters the two-way distributor (1) and then is divided into two paths to flow to the catalyst feeding rotary metering valve (6), the catalyst feeding rotary metering valve (6) comprises a valve body (7) and a ball core (8), a plurality of cavities (9) are uniformly distributed on the ball core (8), after the cavity (9) with a certain opening facing upwards receives the catalyst flowing out of the two-way distributor (1), the ball core (8) is rotated to enable the cavity (9) to have the opening facing downwards, and the catalyst flows to a downstream pipeline to realize feeding.
2. A two-way rotary feeder for polyolefin solid catalysts according to claim 1, characterized in that the cross section of the two-way distributor (1) is equilateral hexagon, and a distributing hopper (3) is arranged in the two-way distributor to divide the internal cavity of the two-way distributor (1) into two channels (4) uniformly to form an inverted Y-shaped channel.
3. The two-way rotary feeder for solid polyolefin catalysts according to claim 2, characterized in that the distribution hopper (3) is a triangular cone with a triangular cross section, the bottom side of the triangular cone is the same as the hexagonal bottom side of the two-way distributor (1), and the angle between the discharge pipeline and the bottom side of the triangular cone is alpha, 90 degrees > alpha is not less than 60 degrees.
4. The two-way rotary feeder of polyolefin solid catalysts according to claim 3, characterized in that the thickness of the distribution hopper (3) is 40-1000mm and the side length is 40-1000 mm.
5. A two-way rotary feeder for solid polyolefin catalysts according to claim 1, characterized in that a two-way distributor (1) is connected to two rotary metering valves (6) for catalyst feeding, the ball core (8) of each rotary metering valve (6) for catalyst feeding is disposed in the valve body (7), a plurality of cavities (9) with fixed volume are uniformly formed on the ball core (8) along a circle of the circumference, the ball core (8) is sequentially connected to the valve rod (10) and the coupling (14), and the cylinder (13) drives the ball core (8) to rotate, thereby driving the cavities (9) for quantitative catalyst metering to rotate.
6. The dual-port rotary feeder for solid catalysts in polyolefins according to claim 5, wherein the number of said cavities (9) is 1-4, and the angle between adjacent cavities (9) is 360 °, 180 °, 120 ° or 90 °.
7. The two-way rotary feeder of polyolefin solid catalysts according to claim 1, characterized in that the ball core (8) and the valve body (7) are sealed with abrasion resistant material.
8. A feeding system of a two-way rotary feeder containing a polyolefin solid catalyst according to any one of claims 1 to 7, comprising: a two-way rotary feeder, a catalyst steel cylinder (15), a catalyst buffer tank (16) and a catalyst feeding tank (17) which are connected in sequence at the upstream, and a catalyst filling tank (18) and a reactor (19) which are connected in sequence at the downstream.
9. The charging system of a two-way rotary feeder of polyolefin solid catalyst according to claim 8, characterized in that a first balance line is provided between the catalyst surge tank (16) and the catalyst charging tank (17), and a second balance line is provided between the catalyst surge tank (16) and the catalyst filling tank (18).
10. The charging system of two-way rotary feeder of polyolefin solid catalyst according to claim 8, characterized in that a first blowing line is provided between the catalyst steel cylinder (15) and the catalyst surge tank (16), a second blowing line is provided between the catalyst surge tank (16) and the catalyst charging tank (17), a third blowing line is provided between the catalyst charging tank (17) and the catalyst filling tank (18), and a fourth blowing line is provided between the catalyst filling tank (18) and the reactor (19).
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| CN201910856447.1A CN112473564A (en) | 2019-09-11 | 2019-09-11 | Two-way rotary feeder and feeding system for polyolefin solid catalyst |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1210029A (en) * | 1997-09-04 | 1999-03-10 | 中国石化扬子石油化工公司 | Apparatus and method for automatically feeding auxiliaries |
| US20060185740A1 (en) * | 2005-02-23 | 2006-08-24 | Depierri Robert G | Metering system and use thereof |
| CN101678296A (en) * | 2007-06-01 | 2010-03-24 | 巴塞尔聚烯烃股份有限公司 | Process for feeding a catalyst in a polymerization reactor |
| CN102993342A (en) * | 2011-09-19 | 2013-03-27 | 中国石油化工股份有限公司 | Feeding system for powdery polyolefin catalyst |
| CN202898283U (en) * | 2012-10-24 | 2013-04-24 | 浙江鸿基石化有限公司 | Major catalyst recycling device for preparing polyolefin |
| CN103285782A (en) * | 2012-03-05 | 2013-09-11 | 浙江大学 | Catalyst tremie pipe |
| CN203303919U (en) * | 2013-05-23 | 2013-11-27 | 陕西延长石油（集团）有限责任公司炼化公司 | Volume type automatic feeder |
| CN106867588A (en) * | 2015-12-14 | 2017-06-20 | 神华集团有限责任公司 | Tripper, sub-material ejection assemblies, gasification furnace and synthesis gas production method and system |
| CN109569443A (en) * | 2017-09-28 | 2019-04-05 | 中国石化工程建设有限公司 | Mobile radial bed reactor |
| CN210965041U (en) * | 2019-09-11 | 2020-07-10 | 上海立得催化剂有限公司 | Two-way rotary feeder and feeding system for polyolefin solid catalyst |
-
2019
- 2019-09-11 CN CN201910856447.1A patent/CN112473564A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1210029A (en) * | 1997-09-04 | 1999-03-10 | 中国石化扬子石油化工公司 | Apparatus and method for automatically feeding auxiliaries |
| US20060185740A1 (en) * | 2005-02-23 | 2006-08-24 | Depierri Robert G | Metering system and use thereof |
| CN101678296A (en) * | 2007-06-01 | 2010-03-24 | 巴塞尔聚烯烃股份有限公司 | Process for feeding a catalyst in a polymerization reactor |
| CN102993342A (en) * | 2011-09-19 | 2013-03-27 | 中国石油化工股份有限公司 | Feeding system for powdery polyolefin catalyst |
| CN103285782A (en) * | 2012-03-05 | 2013-09-11 | 浙江大学 | Catalyst tremie pipe |
| CN202898283U (en) * | 2012-10-24 | 2013-04-24 | 浙江鸿基石化有限公司 | Major catalyst recycling device for preparing polyolefin |
| CN203303919U (en) * | 2013-05-23 | 2013-11-27 | 陕西延长石油（集团）有限责任公司炼化公司 | Volume type automatic feeder |
| CN106867588A (en) * | 2015-12-14 | 2017-06-20 | 神华集团有限责任公司 | Tripper, sub-material ejection assemblies, gasification furnace and synthesis gas production method and system |
| CN109569443A (en) * | 2017-09-28 | 2019-04-05 | 中国石化工程建设有限公司 | Mobile radial bed reactor |
| CN210965041U (en) * | 2019-09-11 | 2020-07-10 | 上海立得催化剂有限公司 | Two-way rotary feeder and feeding system for polyolefin solid catalyst |
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