Low-pressure degassing filter for polypropylene preparation process

Abstract

The utility model relates to the technical field of polyolefin equipment, and particularly discloses a low-pressure degassing filter for a polypropylene preparation process. The low-pressure degassing filter comprises a filter shell, a filter element, a mounting framework and an exhaust channel; the filter element comprises a filter element shell, an inner filter membrane, a mounting seat and a sealing ring. Compared with the original polypropylene fiber felt filter bag filter element, the polypropylene fiber felt filter bag filter element disclosed by the utility model has the advantages of outstanding advantages, no deformation, high temperature resistance and better filtering effect, the filtering effect can reach 99.99%, and the service time of a circulating propylene compressor air valve, a propylene feeding pump, a slurry axial flow pump and a prepolymerization axial flow pump sealing system is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to polyolefin equipment technical field, specifically disclose a low pressure degassing filter for polypropylene preparation process. BACKGROUND

[0002] Low pressure degassing filter F301 is the important equipment of polypropylene device, it is used for separating the polypropylene powder and the gas phase propylene entrained in it from high pressure flash tank D301, the gas phase propylene after separation is compressed and recovered after compressor PK301.If the filter bag of F301 appears damage, will lead to a large amount of fine powder to be entrained to the inlet of PK301, light causes PK301 interlock parking, when a large amount of fine powder is entrained into the inlet of compressor, can lead to PK301 equipment damage.

[0003] When replacing the filter bag, the device needs to be parked, and the TEAL (triethylaluminum) of F301 is treated with carbon dioxide inactivation, which may cause incomplete inactivation and lead to fire accidents. The filter core of the original material has defects in material and effect. The catalyst (triethylaluminum) contained in the filter medium reacts and releases heat when it comes into contact with air or water vapor. Since the continuous use temperature of the polypropylene filter material is only 85℃, when the temperature rises to 110℃, although it can be used for a short time, the fiber softens, which seriously affects the filtering precision and efficiency. When the temperature continues to rise, the filter material will melt and burn, which seriously affects normal production and incomplete filtration. Once the F301 filter bag is damaged, the polypropylene device must be stopped and the filter bag must be replaced before it can be restarted. The stoppage for replacing the filter bag lasts at least 20 hours.

[0004] Therefore, it is necessary to redesign and develop a low pressure degassing filter for polypropylene preparation process to overcome the above problems and avoid affecting the normal operation of the equipment. INVENTION CONTENTS

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A low pressure degassing filter for polypropylene preparation process, comprising a filter housing 1, a filter core 2, a mounting framework 3 and an exhaust passage 4; the filter core 2 comprises a filter core shell 2-1, an inner filter membrane 2-2, a mounting seat 2-3 and a sealing ring 2-5;

[0007] The inner filter membrane 2-2 is located inside the filter core shell 2-1; the inner filter membrane 2-2 is filled with a filter layer composed of metal fiber sintered felt; the surface of the filter core shell 2-1 is a mesh structure and is provided with a plurality of exhaust holes 2-6; the filter core shell 2-1 is connected with the mounting seat 2-3 in cooperation, and the filter core shell 2-1 is provided with a sealing ring 2-5 at the joint with the mounting seat 2-3 for sealing;

[0008] Several filter elements 2 are fixed inside the filter shell 1, and the filter shell 1 is provided with a mounting frame 3 at both ends of the port for fixing the filter; the filter shell 1 is provided with several exhaust channels 4 on the side, which is used for filter ventilation.

[0009] Preferably, the filter element shell 2-1 is provided with a plurality of support ribs 2-4 for support.

[0010] Preferably, the filter layer formed by the metal fiber sintered felt is made of SS316L material.

[0011] Preferably, the filter element 2 is provided with 115 pieces in the filter shell 1.

[0012] Further, the filter elements 2 are distributed equidistantly, and the middle is a 7*11 matrix distribution, and the number of three columns of filter elements 2 is 9, 7 and 3 respectively on both sides of the matrix.

[0013] Preferably, the size of the filter element 2 is 120mm in diameter and 2000mm in length.

[0014] Preferably, the filter layer formed by the metal fiber sintered felt has a pore size of ≤5μm.

[0015] Preferably, the top mounting frame 3 of the filter shell 1 is provided with a clamping groove 3-1 on the outside symmetrically, which is used for fixing the filter.

[0016] The beneficial effects obtained by the utility model are as follows:

[0017] The propylene raw material filter disclosed by the utility model has the advantages of no deformation, no fear of high temperature, better filtering effect, filtering effect of 99.99%, and prolonged service life of the circulating propylene compressor valve, propylene feeding pump, slurry axial flow pump and pre-polymerization axial flow pump sealing system. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is a filter element structure diagram of the filter of the utility model;

[0019] Fig. 2 It is a top view of the top of the filter of the utility model;

[0020] Fig. 3 It is a sectional view of the filter of the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model more clear and definite, the utility model is further described in detail in combination with the following embodiments. It should be explained that the utility model is not limited to the following embodiments. Embodiment 1

[0022] As Figs. 1-3 shown, a low-pressure degassing filter for polypropylene preparation process comprises a filter shell 1, filter cartridges 2, mounting skeletons 3 and exhaust channels 4; the filter cartridges 2 comprise filter cartridge shells 2-1, inner filter membranes 2-2, mounting seats 2-3 and sealing rings 2-5;

[0023] The inner filter membrane 2-2 is located inside the filter cartridge shell 2-1; the inner filter membrane 2-2 is filled with a filter layer composed of metal fiber sintered felt; the surface of the filter cartridge shell 2-1 is a mesh structure and is provided with a plurality of exhaust holes 2-6; the top of the filter cartridge shell 2-1 is connected with the mounting seat 2-3, and the junction of the filter cartridge shell 2-1 and the mounting seat 2-3 is provided with a sealing ring 2-5 for sealing;

[0024] 115 filter cartridges 2 are fixed inside the filter shell 1, and the filter shell 1 is provided with mounting skeletons 3 at both ends to fix the filter; the filter shell 1 is provided with a plurality of exhaust channels 4 on the side for filter ventilation. The filter cartridges 2 are arranged in the filter shell 1 in a total of 115; the filter cartridges 2 are distributed equidistantly, with a 7x11 matrix in the middle and three columns of filter cartridges 2, i.e. 9, 7 and 3, on both sides of the matrix.

[0025] The filter cartridge shell 2-1 is provided with two support ribs 2-4 around the body for support.

[0026] The size of the filter cartridge 2 is 120mm in diameter and 2000mm in length; the filter layer composed of metal fiber sintered felt is made of SS316L material, and the pore size of the filter layer composed of metal fiber sintered felt is ≤5μm.

[0027] The top mounting skeleton 3 of the filter shell 1 is provided with a clamping groove 3-1 symmetrically outside for fixing the filter.

Claims

1. A low pressure degassing filter for polypropylene production process, characterized by, It comprises filter shell (1), filter core (2), mounting framework (3) and exhaust passage (4); the filter core (2) comprises filter core shell (2-1), inner filter membrane (2-2), mounting seat (2-3) and sealing ring (2-5); The inner filter membrane (2-2) is located inside the filter core shell (2-1); the inner filter membrane (2-2) is filled with filter layer composed of metal fiber sintered felt; the surface of the filter core shell (2-1) is a mesh structure, and is provided with a plurality of exhaust holes (2-6); the top of the filter core shell (2-1) is connected with the mounting seat (2-3) in cooperation, and the junction of the filter core shell (2-1) and the mounting seat (2-3) is provided with a sealing ring (2-5) for sealing; A plurality of filter cores (2) are fixed inside the filter shell (1), and the filter shell (1) is provided with mounting frameworks (3) at both ends for fixing the filter; a plurality of exhaust passages (4) are provided on the side of the filter shell (1).

2. The low pressure degassing filter for polypropylene production process according to claim 1, characterized in that, The filter core shell (2-1) is provided with a plurality of support ribs (2-4) around the body for support.

3. The low pressure degassing filter for polypropylene production process according to claim 1, characterized in that, The filter layer composed of metal fiber sintered felt is made of SS316L material.

4. The low pressure degassing filter for polypropylene production process according to claim 1, characterized in that, The filter core (2) is provided with 115 pieces in the filter shell (1).

5. The low pressure degassing filter for polypropylene production process according to claim 4, characterized in that, The filter cores (2) are equally distributed, and the middle part is a 7x11 matrix distribution, and the two sides of the matrix are respectively provided with three columns of filter cores (2) with the number of 9, 7 and 3.

6. The low pressure degassing filter for polypropylene production process according to claim 1, characterized in that, The size of the filter core (2) is 120mm in diameter and 2000mm in length.

7. The low pressure degassing filter for polypropylene production process according to claim 1, characterized in that, The pore size of the filter layer composed of metal fiber sintered felt is ≤5μm.

8. The low pressure degassing filter for polypropylene production process according to claim 1, characterized in that, The top mounting framework (3) of the filter shell (1) is provided with a clamping groove (3-1) symmetrically outside, which is used for fixing the filter.

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