Propylene raw material filter

Abstract

The utility model relates to the technical field of polyolefin equipment, and particularly discloses a filter element of a propylene raw material filter. The propylene raw material filter comprises a filter shell, a filter element and a fixed seat; the filter element comprises a shell, an internal filter layer, an internal filter membrane, a supporting framework, an inlet seat, an outlet seat, a fixing pin and a supporting framework. By changing the structure and the material of the filter, compared with an original filter, the technical effects of no deformation and improved filtering effect can be achieved, 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 the technical field of polyolefin equipment, and specifically discloses a propylene raw material filter. Background Art

[0002] In the polyolefin Basel loop process technology, the propylene filter is an important device for filtering raw propylene and circulating propylene. The liquid propylene is transported by the propylene feed pump to the downstream catalyst prepolymerization tank, prepolymerization reactor, first loop reactor and second loop reactor. It ensures that no polypropylene powder is entrained during the propylene feeding process and will not affect the seal flushing of the downstream axial flow pump. Once the polypropylene powder enters the seal flushing system of the axial flow pump, it will cause the mechanical seal to leak and the seal oil to enter the reactor, causing the device to stop. However, the filter element of the original material has defects in both material and effect, and the filtration is not thorough.

[0003] The existing propylene filter has the problem of poor filtering effect of propylene raw materials, mainly because the propylene recovered from the circulating propylene compressor is mixed with fine polypropylene powder in the system. It is recovered into the propylene feed tank and sent to the downstream through the propylene feed pump. The original material of the propylene filter element is PP material. After long-term filtration, the powder accumulates in the filter element, causing the filter element to bear too much weight, deform seriously, and detach from the hole, causing the mechanical seal of the axial flow pump sealing system to leak.

[0004] Therefore, it is necessary to redesign and develop a propylene raw material filter element to overcome the above problems and avoid affecting the normal operation of the equipment. Utility Model Content

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

[0006] A propylene raw material filter comprises a filter housing 1, a filter element 2, and a fixing seat 3; the filter element 2 comprises a housing 2-1, an internal filter layer 2-2, an internal filter membrane 2-3, an inlet seat 2-4, an outlet seat 2-5, a fixing pin 2-6, and a supporting frame 2-7;

[0007] A shell 2-1 is provided between the inlet seat 2-4 and the outlet seat 2-5, an internal filter layer 2-2 is provided in the shell 2-1, and an internal filter membrane 2-3 is provided between the internal filter layer 2-2 and the shell 2-1 to wrap the internal filter layer 2-2 and separate it from the shell 2-1; the internal filter layer 2-2 is a metal fiber sintered felt; a fixing pin 2-6 is provided at the bottom of the outlet seat 2-5 for fixing and installing the filter element 2; a plurality of supporting frames 2-7 are provided around the shell 2-1 for stabilizing the column structure of the filter element 2;

[0008] Several filter elements 2 are fixed inside the filter housing 1. The inner end of the filter housing 1 is provided with a perforated plate corresponding to the number of filter elements 2. The fixing pins 2-6 are inserted into the holes of the perforated plate for fixing. The ports at both ends of the filter housing 1 are provided with fixing seats 3 to fix the filters.

[0009] Preferably, a plurality of exhaust holes 2-8 are provided on the surface of the housing 2-1.

[0010] Preferably, the inner filter layer 2-2 is made of stainless steel fiber sintered felt.

[0011] Preferably, the internal filter membrane 2-3 is made of SS316L material.

[0012] Preferably, a total of 33 filter elements 2 are arranged in the filter housing 1 .

[0013] Furthermore, the filter elements 2 are evenly spaced and arranged in six rows, with seven filter elements arranged in one row coaxial with the center of the filter housing 1, and three rows and two rows of filter elements 2 with 4, 5, 6 and 5, 6 respectively arranged on both sides.

[0014] Preferably, the filter element 2 has a diameter of 70 mm and a length of 1000 mm.

[0015] Preferably, the pore size of the inner filter layer 2-2 is ≤10 μm.

[0016] Preferably, fixing ears are symmetrically provided on the outer side of the filter housing 1 for fixing the filter.

[0017] Beneficial effects achieved by the utility model:

[0018] The propylene raw material filter disclosed by the utility model can achieve the technical effect of no deformation and improved filtering effect compared with the filter with the original PP material filter element by changing the filter structure and material. The filtering effect can reach 99.99%, and the service life of the circulating propylene compressor valve and the propylene feed pump as well as the slurry axial flow pump and the pre-polymerization axial flow pump sealing system is extended. The modified filter element can also be dismantled many times, recycled and cleaned and reused, thus saving costs for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the filter element structure of the propylene raw material filter of the utility model;

[0020] Figure 2 It is a cross-sectional view of the propylene raw material filter of the utility model;

[0021] Figure 3 It is a top view of the inlet end of the propylene raw material filter of the utility model. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail in conjunction with the following embodiments. It should be noted that the utility model is not limited to the following embodiments.

[0023] Example 1

[0024] like Figure 1 As shown, a propylene raw material filter comprises a filter housing 1, a filter element 2, and a fixing seat 3; the filter element 2 comprises a housing 2-1, an internal filter layer 2-2, an internal filter membrane 2-3, an inlet seat 2-4, an outlet seat 2-5, a fixing pin 2-6, and a supporting frame 2-7;

[0025] A shell 2-1 is provided between the inlet seat 2-4 and the outlet seat 2-5, an internal filter layer 2-2 is provided in the shell 2-1, and an internal filter membrane 2-3 is provided between the internal filter membrane 2-3 and the shell 2-1 to wrap the internal filter layer 2-2 and separate it from the shell 2-1; the internal filter layer 2-2 is a metal fiber sintered felt; a fixing pin 2-6 is provided at the bottom of the outlet seat 2-5 for fixing and installing the filter element 2; a plurality of supporting skeletons 2-7 are provided around the shell 2-1 for stabilizing the column structure of the filter element 2; the material of the internal filter layer 2-2 is 316L stainless steel fiber sintered felt, and the internal pore size of the stainless steel fiber sintered felt is ≤10μm; the internal filter membrane 2-3 is made of SS316L material; a plurality of exhaust holes 2-8 are provided on the surface of the shell 2-1.

[0026] 33 filter elements 2 are fixed inside the filter housing 1. The end of the filter housing 1 is provided with a perforated plate corresponding to the number of filter elements 2. The fixing pins 2-6 are inserted into the holes of the perforated plate for fixing. The ports at both ends of the filter housing 1 are provided with fixing seats 3 to fix the filter. The filter elements 2 are evenly spaced and arranged in six rows. A row coaxial with the center of the filter housing 1 is provided with 7 filter elements 2. Three rows and two rows of filter elements 2 are provided on both sides, respectively, with 4, 5, 6 and 5, 6 filter elements 2.

[0027] The filter element 2 has a diameter of 70 mm and a length of 1000 mm.

[0028] The outer side of the filter housing 1 is symmetrically provided with fixing ears for fixing the filter.

Claims

1. A propylene raw material filter, characterized in that: It comprises a filter housing (1), a filter element (2), and a fixing seat (3); the filter element (2) comprises a housing (2-1), an internal filter layer (2-2), an internal filter membrane (2-3), an inlet seat (2-4), an outlet seat (2-5), a fixing pin (2-6), and a supporting frame (2-7); A shell (2-1) is provided between the inlet seat (2-4) and the outlet seat (2-5); an internal filter layer (2-2) is provided in the shell (2-1); an internal filter membrane (2-3) is provided between the internal filter layer (2-2) and the shell (2-1) to wrap the internal filter layer (2-2) and separate it from the shell (2-1); the internal filter layer (2-2) is a metal fiber sintered felt; a fixing pin (2-6) is provided at the bottom of the outlet seat (2-5) for fixing and installing the filter element (2); and a plurality of supporting frames (2-7) are provided on the peripheral side of the shell (2-1) for stabilizing the column structure of the filter element (2); A plurality of filter elements (2) are fixed inside a filter housing (1); a perforated plate corresponding to the number of filter elements (2) is provided at the inner end of the filter housing (1); the fixing pins (2-6) are inserted into the holes of the perforated plate for fixing; and fixing seats (3) are provided at both end ports of the filter housing (1) for fixing the filter.

2. The propylene feedstock filter according to claim 1, characterized in that: A plurality of exhaust holes (2-8) are provided on the surface of the shell (2-1).

3. The propylene feedstock filter according to claim 1, characterized in that: The material of the inner filter layer (2-2) is stainless steel fiber sintered felt.

4. The propylene feedstock filter according to claim 1, characterized in that: The internal filter membrane (2-3) is made of SS316L material.

5. The propylene feedstock filter according to claim 1, characterized in that: A total of 33 filter elements (2) are arranged in the filter housing (1).

6. The propylene feedstock filter according to claim 5, characterized in that: The filter elements (2) are evenly spaced and arranged in six rows, with seven filter elements (2) arranged in one row coaxial with the center of the filter housing (1), and three rows of 4, 5, 6 and two rows of 5, 6 filter elements (2) arranged on both sides respectively.

7. The propylene feedstock filter according to claim 1, characterized in that: The filter element (2) has a diameter of 70 mm and a length of 1000 mm.

8. The propylene feedstock filter according to claim 1, characterized in that: The pore size of the inner filter layer (2-2) is ≤10 μm.

9. The propylene feedstock filter according to claim 1, characterized in that: The outer side of the filter housing (1) is symmetrically provided with fixing ears for fixing the filter.

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