Feeder suitable for solid catalyst and feeding method thereof

Abstract

The invention relates to a feeder suitable for a solid catalyst and a feeding method thereof, the feeder suitable for the solid catalyst is used for injecting a catalyst in a catalyst steel cylinder into a reactor, and the feeder suitable for the solid catalyst comprises a mineral oil metering system, a catalyst pulping system and a catalyst feeding system. Compared with the prior art, the solid catalyst is diluted by adding the mineral oil, and then the catalyst is injected into the reactor by adopting the charging pump, so that the charging is stable, the metering is accurate, the pipeline blockage problem can be avoided, the process design, the equipment structure and the control mode selection are optimized, the unnecessary investment is reduced, and the cost is ensured to be as low as possible.

Description

Technical Field

[0001] The invention relates to the technical field of solid catalyst feeding, in particular to a feeder suitable for solid catalyst and a feeding method thereof. Background Art

[0002] At present, the main gas phase polyethylene processes in China are divided into three processes: UCC's Unipol gas phase fluidized bed, BP's innovene gas phase fluidized bed, and Sinopec's GPE gas phase fluidized bed. The three processes use four different solid catalyst feeders. The four feeders all use a dry method to inject the solid catalyst into the reactor, and there are different problems in the production and application process. In the production process, the catalyst is the core of the entire polymerization reaction, and the catalyst feeder is the core patented equipment in the entire polyethylene process. The operation status of the feeder has a direct impact on the reactor of the device. The performance of the feeder determines whether the polyethylene device can operate for a long period of time.

[0003] At present, the solid feeders used in domestic devices have the disadvantages of unstable feeding (forced feeding), inaccurate metering, and pipeline blockage. The devices cannot operate for a long period of time, causing great economic losses to the devices.

[0004] For example, CN218590472U discloses a catalyst automatic delivery system, in which a conveying shell is fixedly connected to the top of the support leg, and a delivery assembly is arranged inside the conveying shell; the delivery assembly includes a motor, and the left outer surface of the conveying shell is fixedly connected to a mounting box, and the motor is fixedly connected to the outer surface of the conveying shell through the mounting box, and one end of the motor output shaft is fixedly connected to the transmission shaft, and the outer surface of the transmission shaft is fixedly connected to a spiral blade, and the inner wall of the conveying shell is fixedly connected to a fixed block, and the internal rotation of the fixed block is connected to a rotating block, and the end of the transmission shaft away from the motor is fixedly connected to the rotating block. The catalyst automatic delivery system, when the solid catalyst enters the interior of the storage barrel, drives the adjustment plate to move to the left by starting the electric push rod, and adjusts the amount of material to be discharged according to the needs, and then starts the motor to drive the transmission shaft to rotate inside the fixed block, so that the spiral blades deliver the solid catalyst to the discharge port for subsequent use.

[0005] Therefore, there is an urgent need for a feeder suitable for solid catalysts and a feeding method thereof that has stable feeding, accurate metering, and can avoid pipeline blockage problems. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a feeder suitable for solid catalysts and a feeding method thereof. The solid catalyst is diluted with mineral oil and then the catalyst is injected into the reactor by a feeding pump. The feeding is stable, the metering is accurate, and the pipeline blockage problem can be avoided.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The first object of the present invention is to provide a feeder suitable for solid catalysts, which is used to inject the catalyst in the catalyst cylinder into the reactor, and the feeder suitable for solid catalysts includes a mineral oil metering system, a catalyst slurrying system, and a catalyst feeding system; the mineral oil metering system includes a mineral oil tank; the mineral oil tank of the mineral oil metering system is connected to the second pipeline; the catalyst slurrying system includes a slurrying tank; the inlet of the slurrying tank of the catalyst slurrying system is connected to the first pipeline and the second pipeline respectively, and the outlet of the slurrying tank of the catalyst slurrying system is connected to the third pipeline; the catalyst feeding system includes a feeding tank; the inlet of the feeding tank of the catalyst feeding system is connected to the third pipeline and the fifth pipeline respectively, and the outlet of the feeding tank of the catalyst feeding system is connected to the fourth pipeline; one end of the fifth pipeline is connected to the middle section of the fourth pipeline; the fifth pipeline is used as a catalyst reflux line to ensure that the catalyst can be self-circulated when it is not injected into the reactor, so as to ensure that the catalyst does not settle.

[0009] Furthermore, in order to avoid clogging of the pipeline and inaccurate metering during the solid catalyst feeding process, the original feeding method is changed.

[0010] Furthermore, the mineral oil metering system also includes a first flow meter, a first electronic scale, and a discharge pump; a mineral oil tank support is provided at the bottom of the mineral oil tank, and a first electronic scale is installed on the mineral oil tank support for displaying the weight of the raw materials in the mineral oil tank; the discharge pump and the first flow meter are arranged on the second pipeline, and the mineral oil in the mineral oil tank is injected into the catalyst slurry system through the discharge pump, the first flow meter and the second pipeline.

[0011] Furthermore, the catalyst slurrying system includes a first agitator, a filter, and a second electronic scale. The catalyst slurrying system is used to add a certain proportion of mineral oil to a solid catalyst to form a slurry catalyst, and the concentration is controlled at 20-35% wt; the first agitator is arranged in a slurrying tank; the filter is connected to the slurrying tank; a slurrying tank support is provided at the bottom of the slurrying tank, and a second electronic scale is installed on the slurrying tank support for displaying the weight of the raw materials in the slurrying tank.

[0012] Furthermore, the mineral oil is an inert solvent and does not participate in the reactor reaction. The mineral oil has the following functions: acts as a diluent, lubricates the catalyst, protects the catalyst particles from being broken, and protects the catalyst from being contaminated by water and oxygen.

[0013] Furthermore, the catalyst feeding system comprises a second agitator; the second agitator is arranged in the feeding tank.

[0014] Furthermore, the fourth pipeline is provided with a slurry feeding screw pump and a second flow meter near the reactor side, and the feeding frequency can be determined by adjusting the speed of the slurry feeding screw pump motor, thereby achieving uniform, stable and accurate feeding.

[0015] Furthermore, the fourth pipeline is also provided with an injection valve group near the reactor side.

[0016] Furthermore, the feeder also includes a temperature control system to ensure that the catalyst solution has good fluidity; a multi-channel temperature control system is set up, which is respectively connected to the pulping tank, the feeding tank, the fourth pipeline, and the fifth pipeline; the temperature of the temperature control system is controlled between 25°C and 50°C.

[0017] Furthermore, two slurry feeding screw pumps are arranged in parallel.

[0018] A second object of the present invention is to provide a feeding method for a feeder suitable for a solid catalyst, the feeding method comprising the steps of:

[0019] The mineral oil is added to the slurry tank of the catalyst slurry system of the feeder through the mineral oil metering system;

[0020] Pressurizing the solid catalyst from the catalyst cylinder to the slurry tank of the catalyst slurry system to make the solid catalyst into a slurry catalyst;

[0021] The slurry catalyst is transported from the slurry tank of the catalyst slurry system to the feed tank of the catalyst feed system;

[0022] feeding the catalyst from the feed tank of the catalyst feed system into the reactor;

[0023] The residual material in the slurry tank of the catalyst slurry system and the feeding tank of the catalyst feeding system is returned to the catalyst cylinder.

[0024] Furthermore, the feeder also includes pipelines for conveying nitrogen and solvent; the catalyst in the fourth pipeline is blown to the reactor by a certain flow of high-pressure blowing nitrogen; the pressure of the high-pressure blowing nitrogen is greater than the reactor pressure of 0.7MPa. This design prevents the catalyst from remaining in the pipeline and prevents the catalyst from clogging the pipeline.

[0025] Furthermore, the reactor is connected to a nitrogen delivery pipeline and a solvent delivery pipeline; the angle between the nitrogen delivery pipeline and the solvent delivery pipeline and the fourth pipeline is less than 45°.

[0026] Furthermore, the flow rate of the high-pressure purge nitrogen is 20-50 kg / h.

[0027] Furthermore, the flow rate of the solvent delivery is 400-850 kg / h. Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1) The technical solution provides a feeder suitable for solid catalysts and a feeding method thereof, which converts the solid catalyst into a slurry state, making it more convenient to measure and transport.

[0029] 2) The technical solution provides a feeder suitable for solid catalysts and a feeding method thereof, which selects an organic inert solvent that is the same or similar to the main polymerization process as a diluent, which not only avoids the trouble of downstream process operation, detection, separation, and recovery, but also reduces operating costs and significantly reduces investment.

[0030] 3) The technical solution provides a feeder suitable for solid catalysts and a feeding method thereof, which minimizes the abrasion of catalyst particles and protects the particle morphology.

[0031] 4) The technical solution provides a feeder suitable for solid catalysts and a feeding method thereof. Through research, the design and operating conditions of the user's on-site pulping equipment are determined, and key parameters such as sedimentation, slurry uniformity, shear damage and speed energy consumption, internal structure, safety and environmental protection, and quality control are reasonably balanced.

[0032] 5) The technical solution provides a feeder suitable for solid catalysts and a feeding method thereof, which optimizes process design, equipment structure and control mode selection, reduces unnecessary investment and ensures that the cost is as low as possible.

[0033] 6) The technical solution provides a feeder suitable for solid catalysts and a feeding method thereof, which improves the stability of catalyst feeding and the accuracy of metering.

[0034] The feeder is mainly used to change the feeding method of solid catalyst, turning solid catalyst into slurry catalyst, making the whole feeding more stable and accurate. It can not only be used for automatic catalyst feeding in polyethylene equipment, but also can be used for continuous feeding of small flow of solid particles in other chemical processes or laboratories. It has high cost-effectiveness, practical value and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of a feeder suitable for solid catalysts in Examples 1, 2 and 3 of the present technical solution.

[0036] Figure 2 It is a schematic diagram of the blade structure of the agitators (the first agitator and the second agitator are both agitators) in Examples 1, 2, and 3 of the technical solution.

[0037] Figure 3 This is a schematic diagram of the structure of the slurry feeding screw pump in Examples 1, 2, and 3 of the present technical solution.

[0038] Figure 4 This is a schematic diagram of the structure of the injection valve group and the fifth pipeline in Examples 1, 2, and 3 of the present technical solution.

[0039] The numbers in the figure show:

[0040] 1. Catalyst cylinder, 201. Mineral oil tank, 301. Slurry tank, 302. First agitator, 303. Filter, 401. Feed tank, 402. Second agitator, 5. Reactor, 6. Slurry feeding screw pump, 7. Injection valve group, 8. First pipeline, 9. Second pipeline, 10. Third pipeline, 11. Fourth pipeline, 12. Fifth pipeline, 13. Nitrogen and solvent delivery pipelines, 14. Paddles;

[0041] 601, discharge body, 602, stator, 603, rotor, 604, universal joint, 605, intermediate shaft, 606, suction chamber, 607, shaft seal, 608, bearing, 609, rotating shaft, 6010, bearing body;

[0042] a. High-pressure purge nitrogen and high-pressure solvent inlet; b. Slurry catalyst returns to the feed tank; c. Slurry catalyst goes to the reactor and is connected to the reactor injection module using a metal hose. DETAILED DESCRIPTION

[0043] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The features such as component models, material names, connection structures, control methods, etc. that are not clearly described in this technical solution are all regarded as common technical features disclosed in the prior art.

[0044] The entire feeder design consists of a catalyst cylinder 1 to a catalyst slurrying system including a slurrying tank 301, a catalyst feeding system from the slurrying tank 301 to a feeding tank 401, a catalyst from the feeding tank 401 to a slurry feeding screw pump 6, and a catalyst inlet reactor 5.

[0045] Example 1

[0046] like Figure 1 As shown, this embodiment provides a feeder suitable for solid catalysts, which is used to inject the catalyst in the catalyst cylinder 1 into the reactor 5. The feeder suitable for solid catalysts includes a mineral oil metering system, a catalyst slurrying system, and a catalyst feeding system.

[0047] The mineral oil metering system includes a mineral oil tank 201, a first flow meter, a first electronic scale, and a discharge pump; the mineral oil tank 201 of the mineral oil metering system is connected to the second pipeline 9; a mineral oil tank 201 support is provided at the bottom of the mineral oil tank 201, and a first electronic scale is installed on the mineral oil tank 201 support for displaying the weight of the raw materials in the mineral oil tank 201; the discharge pump and the first flow meter are provided on the second pipeline 9, and the mineral oil in the mineral oil tank 201 is injected into the catalyst slurry system through the discharge pump, the first flow meter and the second pipeline 9.

[0048] The catalyst slurrying system includes a slurrying tank 301, a first agitator 302, a filter 303, and a second electronic scale; the inlet of the slurrying tank 301 of the catalyst slurrying system is connected to the first pipeline 8 and the second pipeline 9 respectively, and the outlet of the slurrying tank 301 of the catalyst slurrying system is connected to the third pipeline 10. The catalyst slurrying system is used to add a certain proportion of mineral oil to a solid catalyst to make a slurry catalyst, and the concentration is controlled at 20-35%wt; the first agitator 302 is arranged in the slurrying tank 301; the filter 303 is connected to the slurrying tank 301; the bottom of the slurrying tank 301 is provided with a slurrying tank 301 support, and the slurrying tank 301 support is installed with a second electronic scale for displaying the weight of the raw materials in the slurrying tank 301.

[0049] The catalyst feeding system includes a feeding tank 401 and a second agitator 402; the inlet of the feeding tank 401 of the catalyst feeding system is connected to the third pipeline 10 and the fifth pipeline 12 respectively, and the outlet of the feeding tank 401 of the catalyst feeding system is connected to the fourth pipeline 11; one end of the fifth pipeline 12 is connected to the middle section of the fourth pipeline 11; the fifth pipeline 12 is used as a catalyst reflux line to ensure that the catalyst can be self-circulated when it is not injected into the reactor 5, ensuring that the catalyst does not settle; the second agitator 402 is arranged in the feeding tank 401.

[0050] The fourth pipeline 11 is provided with a slurry feeding screw pump 6 and a second flow meter near the reactor 5. The feeding frequency can be determined by adjusting the speed of the motor of the slurry feeding screw pump 6, so as to achieve uniform, stable and accurate feeding.

[0051] The reactor 5 is connected to a nitrogen and solvent delivery pipeline 13; the angle between the nitrogen and solvent delivery pipeline 13 and the fourth pipeline 11 is less than 45°.

[0052] The feeder also includes a temperature control system to ensure that the catalyst solution has good fluidity; a 4-way temperature control system is set up, which is connected to the pulping tank 301, the feeding tank 401, the fourth pipeline 11, and the fifth pipeline 12 respectively; the temperature of the temperature control system is controlled between 25℃-50℃.

[0053] The above-mentioned feeding method comprises the following steps:

[0054] Adding mineral oil to the slurry tank 301 of the catalyst slurry system of the feeder through the mineral oil metering system;

[0055] The solid catalyst is pressed from the catalyst cylinder 1 to the slurry tank 301 of the catalyst slurry system to make the solid catalyst into a slurry catalyst;

[0056] The slurry catalyst is sent from the slurry tank 301 of the catalyst slurry system to the feed tank 401 of the catalyst feed system;

[0057] The catalyst is fed into the reactor 5 from the feed tank 401 of the catalyst feed system;

[0058] The remaining materials in the slurry tank 301 of the catalyst slurry system and the feeding tank 401 of the catalyst feeding system are returned to the catalyst cylinder 1.

[0059] The feeder also includes a nitrogen and solvent delivery pipeline 13; the catalyst in the fourth pipeline 11 is blown to the reactor 5 by a certain flow of high-pressure blowing nitrogen; the pressure of the high-pressure blowing nitrogen is greater than the pressure of the reactor 5 by 0.7MPa. This design prevents the catalyst from remaining in the pipeline and prevents the catalyst from clogging the pipeline.

[0060] The flow rate of high-pressure nitrogen blowing is 20-50kg / h.

[0061] Example 2

[0062] This embodiment provides a feeder suitable for a solid catalyst, comprising:

[0063] The first unloading system from catalyst cylinder 1 to catalyst slurry tank 301 (D-3050) is mainly used to increase the pressure of solid catalyst cylinder 1 to 0.3-0.6MPa, release the pressure of slurry tank 301, and control the pressure at 30KPa. The solid catalyst is pressed from catalyst cylinder 1 to catalyst slurry tank 301 (D-3050) by nitrogen.

[0064] A certain amount of mineral oil is first added into the pulping tank 301, and the first agitator 302 is started, and the agitation is performed for at least 1 hour.

[0065] The second unloading system of the catalyst from the slurry tank 301 to the feed tank 401. When the material level of the catalyst feed tank 401 (D-3051) is low, the pressure of D-3050 is increased to 0.2-0.4MPa, and the pressure of D-3051 is set to 30Kpa to automatically open the process from D-3050 to D-3051, and the slurry catalyst after slurrying is pressed into D-3050.

[0066] The catalyst is transported into the reactor 5 by the delivery system. The catalyst is injected from the feed tank 401 into the reactor 5 through the feed pump by the control program. The catalyst passes through two parallel-connected slurry feed screw pumps 6 (one on and one on standby). The slurry feed screw pump 6 is frequency-controlled. The speed of the slurry feed screw pump 6 is controlled by the outlet flow meter. The speed of the slurry feed screw pump 6 can be set as needed to achieve the required flow rate.

[0067] The catalyst enters the injection valve group 7 after passing through the flow meter. When the pressure of the catalyst is greater than the pressure of the reactor 5, the injection valve group 7 is opened, and then the catalyst is purged by high-pressure nitrogen or flushed by high-pressure solvent into the reactor 5. The nitrogen or solvent flow must meet the design requirements. If the catalyst does not need to be injected into the reactor 5, the catalyst is returned to the D-3051 feeding tank 401 through the three-way valve for circulation.

[0068] The catalyst slurry tank 301 (D-3050) and catalyst feeding tank 401 (D-3051) are operated by returning the remaining material to the catalyst cylinder 1. The catalyst slurry tank 301 (D-3050) and catalyst feeding tank 401 (D-3051) are equipped with a three-way hand valve at the root. When the feeding system needs to be repaired or other circumstances require the cleaning of the catalyst inside the D-3050 and D-3051 tanks, the three-way hand valve at the root is rotated 90° to open the catalyst return process and return the remaining material to the catalyst cylinder 1.

[0069] Example 3

[0070] This embodiment provides a feeder suitable for solid catalysts, which, based on Embodiment 1, further comprises:

[0071] Please see Figure 2 The catalyst tank agitator, that is, the agitators of the slurry tank 301 and the feed tank 401 (respectively the first agitator 302 and the second agitator 402) have the same structure and agitator design, and are equipped with a solvent leaching nozzle. The function of the agitator is to ensure that no catalyst sedimentation occurs. The agitator has a total of 4 layers of blades 14 (such as Figure 2 As shown), the diameter of the upper three layers of blades 14 is 600 mm, the diameter of the lowest blade 14 is 400 mm, the spacing is 450 mm, each layer has 4 45° swept blades 14, the distance between the blade 14 and the discharge port at the bottom of the tank is no more than 10 cm (5 cm is recommended), and the agitator keeps running during the feeding process.

[0072] Please see Figure 3, the catalyst feeding pump (i.e., the slurry feeding screw pump 6), the slurry feeding screw pump 6 is composed of a discharge body (601), a stator (602), a rotor 603, a universal joint 604, an intermediate shaft 605, a suction chamber 606, a shaft seal 607, a bearing 608, a rotating shaft 609, a bearing body 6010, etc., a stator (602) and a rotor 603 are arranged between the discharge body (601) and the universal joint 604, an intermediate shaft 605 is arranged on the other side of the universal joint 604, the universal joint 604 and the intermediate shaft 605 are arranged in the suction chamber 606, the suction chamber 606 is connected to the shaft seal 607, the shaft seal 607 is connected to the rotating shaft 609, and the rotating shaft 609 is respectively connected to the bearing 608 and the bearing body 6010, the specific working principle is the existing technology, and it will not be repeated here. The design capacity of the slurry feeding screw pump 6 is selected to be 0-40L / h.

[0073] Please refer to Figure 4 After the catalyst is discharged from the slurry feeding screw pump 6, the catalyst is sent to the reactor 5 through the HPN or inert solvent in the pipeline. The pressure of HPN and the inert solvent is greater than the pressure of the reactor 5 by more than 1.0MPa. The flow rate of HPN is set at 25-50NM 3 / h, the flow rate of the solvent is set at 400-850kg / h.

[0074] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A feeder suitable for solid catalyst, used for injecting the catalyst in the catalyst cylinder (1) into the reactor (5), characterized in that: The feeder suitable for solid catalyst includes a mineral oil metering system, a catalyst slurry making system, and a catalyst feeding system; The mineral oil metering system comprises a mineral oil tank (201); The mineral oil tank (201) of the mineral oil metering system is connected to the second pipeline (9); The catalyst slurrying system comprises a slurrying tank (301); The inlet of the slurry tank (301) of the catalyst slurry system is connected to the first pipeline (8) and the second pipeline (9) respectively, and the outlet of the slurry tank (301) of the catalyst slurry system is connected to the third pipeline (10); The catalyst feeding system comprises a feeding tank (401); The inlet of the feed tank (401) of the catalyst feed system is connected to the third pipeline (10) and the fifth pipeline (12), respectively, and the outlet of the feed tank (401) of the catalyst feed system is connected to the fourth pipeline (11); One end of the fifth pipeline (12) is connected to the middle section of the fourth pipeline (11); the fifth pipeline (12) is used as a catalyst reflux line to ensure that the catalyst can circulate when it is not injected into the reactor (5) and to ensure that the catalyst does not settle.

2. A feeder suitable for solid catalyst according to claim 1, characterized in that: The mineral oil metering system also includes a first flow meter, a first electronic scale, and a discharge pump; A mineral oil tank (201) support is provided at the bottom of the mineral oil tank (201), and a first electronic scale is installed on the mineral oil tank (201) support for displaying the weight of the raw materials in the mineral oil tank (201); The unloading pump and the first flow meter are arranged on the second pipeline (9), and the mineral oil in the mineral oil tank (201) is injected into the catalyst slurry system through the unloading pump, the first flow meter and the second pipeline (9).

3. A feeder suitable for solid catalyst according to claim 1, characterized in that: The catalyst slurrying system comprises a first stirrer (302), a filter (303), and a second electronic scale. The catalyst slurrying system is used to add a certain proportion of mineral oil to a solid catalyst to prepare a slurry catalyst, and the concentration is controlled at 20-35%wt; The first agitator (302) is disposed in the pulping tank (301); The filter (303) is connected to the pulping tank (301); A pulping tank (301) support is provided at the bottom of the pulping tank (301), and a second electronic scale is installed on the pulping tank (301) support for displaying the weight of the raw materials in the pulping tank (301).

4. A feeder suitable for solid catalyst according to claim 1, characterized in that: The catalyst feeding system includes a second agitator (402); The second agitator (402) is disposed in the feeding tank (401).

5. A feeder suitable for solid catalyst according to claim 1, characterized in that: The fourth pipeline (11) is provided with a slurry feeding screw pump (6) and a second flow meter near the reactor (5). The feeding frequency can be determined by adjusting the speed of the motor of the slurry feeding screw pump (6), thereby achieving uniform, stable and accurate feeding.

6. A feeder suitable for solid catalyst according to claim 1, characterized in that: The reactor (5) is connected to a nitrogen delivery pipeline and a solvent delivery pipeline (13); The angle between the nitrogen and solvent delivery pipeline (13) and the fourth pipeline (11) is less than 45°.

7. A feeder suitable for solid catalyst according to claim 1, characterized in that: The feeder also includes a temperature control system to ensure that the catalyst solution has good fluidity; A multi-channel temperature control system is provided, which is respectively connected to the pulping tank (301), the feeding tank (401), the fourth pipeline (11), and the fifth pipeline (12); The temperature of the temperature control system is controlled between 25°C and 50°C.

8. A method for feeding a solid catalyst using a feeder as claimed in any one of claims 1 to 7, characterized in that: The feeding method comprises the following steps: Adding mineral oil to the slurry tank (301) of the catalyst slurry system of the feeder through the mineral oil metering system; The solid catalyst is pressed from the catalyst cylinder (1) to the slurry tank (301) of the catalyst slurry system to make the solid catalyst into a slurry catalyst; The slurry catalyst is transported from the slurry tank (301) of the catalyst slurry system to the feed tank (401) of the catalyst feed system; The catalyst is fed from a feed tank (401) of a catalyst feed system into a reactor (5); The remaining material in the slurry making tank (301) of the catalyst slurry making system and the feeding tank (401) of the catalyst feeding system is returned to the catalyst cylinder (1).

9. A feeding method for a feeder suitable for a solid catalyst according to claim 8, characterized in that: The feeder also includes nitrogen delivery and solvent delivery pipelines (13); The catalyst in the fourth pipeline (11) is blown to the reactor (5) by high-pressure purge nitrogen or a transport solvent; The pressure of the high-pressure purging nitrogen or the transporting solvent is greater than the pressure of the reactor (5) to prevent the catalyst from remaining in the pipeline and to prevent the catalyst from clogging the pipeline.

10. A feeding method suitable for a solid catalyst feeder according to claim 9, characterized in that: The flow rate of the high-pressure purge nitrogen is 20-50 kg / h; The flow rate of the delivered solvent is set at 400-850 kg / h.

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