Melt filter element cleaning effect detection device

Abstract

The utility model belongs to the technical field of polyester production equipment, and relates to a melt filter element cleaning effect detection device which comprises a precision filter, a centrifugal pump, a low discharge valve, a heating device and a valve a, a liquid inlet I is formed in the top of the precision filter, a liquid outlet I and a liquid outlet II are formed in the bottom of the precision filter, and the liquid outlet I is sequentially connected with the centrifugal pump and the liquid inlet I through an ethylene glycol pipeline; the heating device is sleeved on the ethylene glycol pipeline between the centrifugal pump and the liquid inlet I; a liquid inlet II is formed in the ethylene glycol pipeline between the liquid outlet I and the centrifugal pump; the valve a is connected to the ethylene glycol pipeline between the centrifugal pump and the heating device; and the low discharge valve is connected with the liquid outlet II. The device for detecting the cleaning effect of the melt filter element can detect the cleaning effect of the melt filter element before the melt filter element is put on a machine, and is simple in detection process and easy to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of polyester production equipment, and in particular relates to a melt filter element cleaning effect detection device. Background Art

[0002] In the polyester industry, the melt filter element is a very important filtering equipment. It is mainly composed of stainless steel woven mesh and stainless steel fiber sintered felt. It has good high temperature resistance and mechanical strength. It plays a role in removing melt impurity particles in polyester production and reducing the impact of impurity particles on product stability. However, after the impurity particles are filtered by the melt filter element, they will adhere to its stainless steel fiber sintered felt, so the filter element needs to be replaced every once in a while. In order to extend the service life of the filter element, the replaced filter element is generally cleaned so that it can be reused.

[0003] The existing cleaning procedures are generally carried out by high-temperature hydrolysis, boiling, ultrasonic cleaning or high-pressure washing, etc., and after the integrity is tested by bubble point test, it can wait for the machine to be put on. However, some impurity particles, cleaning agents used in the cleaning process, and hydrolysis products may still be attached to the melt filter element. There is no effective device in the existing cleaning method to check whether the melt filter element meets the machine requirements after cleaning (for example, patent CN 109794459 A discloses a polyester melt filter element cleaning process, which uses a high-temperature hydrolysis method, but its melt filter element is put on the machine only after the bubble point pressure and bubble point flow rate are tested, and the effect of the melt filter element cleaning is not tested); the color and transparency of the melt will be affected after the unqualified melt filter element is put on the machine, especially in the production of glossy slices, the cleaning effect of the melt filter element will greatly affect the color of the slices. If the cleaning fails to meet the machine requirements, it is very likely to cause excessive melt waste discharge and slice degradation, resulting in large economic losses.

[0004] Therefore, it is of great significance to study a melt filter element cleaning effect detection device. Utility Model Content

[0005] In order to solve the technical problems existing in the prior art, the utility model provides a melt filter element cleaning effect detection device.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A melt filter element cleaning effect detection device comprises a precision filter, a centrifugal pump, a low discharge valve, a heating device and a valve a;

[0008] The top of the precision filter is provided with a liquid inlet I, and the bottom is provided with a liquid outlet I and a liquid outlet II. The liquid outlet I is connected to the centrifugal pump and the liquid inlet I in sequence through an ethylene glycol pipeline;

[0009] The heating device is sleeved on the ethylene glycol pipeline between the centrifugal pump and the liquid inlet I;

[0010] A liquid inlet II is provided on the ethylene glycol pipeline between the liquid outlet I and the centrifugal pump;

[0011] A valve a is connected to the glycol pipeline between the centrifugal pump and the heating device;

[0012] The low discharge valve is connected to the liquid outlet II.

[0013] As the preferred technical solution:

[0014] The above-mentioned melt filter element cleaning effect detection device further includes a mounting plate;

[0015] The mounting plate is located inside the precision filter, and is used to fix the melt filter element to be tested.

[0016] In the above-mentioned melt filter element cleaning effect detection device, the heating device is a jacketed tube structure;

[0017] The end of the heating device close to the liquid inlet I is connected to the steam inlet pipeline through valve b, and the end away from the liquid inlet I is connected to the steam outlet pipeline through valve c;

[0018] A temperature gauge is connected to the ethylene glycol pipeline between the liquid inlet I and the heating device.

[0019] In the above-mentioned melt filter element cleaning effect detection device, a pressure gauge is connected to the ethylene glycol pipeline between the centrifugal pump and the valve a.

[0020] In the above-mentioned melt filter element cleaning effect detection device, a valve d is connected to the ethylene glycol pipeline between the liquid inlet II and the centrifugal pump.

[0021] In the melt filter element cleaning effect detection device as described above, a valve e is also connected to the top of the precision filter.

[0022] A melt filter element cleaning effect detection device as described above, the melt filter element cleaning effect detection device also includes an expansion tank;

[0023] The lower end of the expansion tank is located vertically higher than the precision filter;

[0024] The lower end of the expansion tank is communicated with the liquid inlet II through an ethylene glycol pipeline.

[0025] In the above-mentioned melt filter element cleaning effect detection device, a liquid inlet III is arranged on the upper part of the expansion tank, and the liquid inlet III is connected to the ethylene glycol pipeline through a valve f.

[0026] In a melt filter element cleaning effect detection device as described above, a degassing pipe is connected to the top of the expansion tank, and a valve g is provided on the degassing pipe. When ethylene glycol is heated from room temperature to over 100°C, its volume expands by about 10%, and the precision filter needs to be depressurized, so valve g is kept normally open.

[0027] The utility model uses fresh ethylene glycol as a detection reagent, uses a jacketed tube for heating, and drives fresh hot ethylene glycol to circulate and flush the melt filter element through a centrifugal pump, simulating the filtering state of the melt filter element in normal production. The polymers and organic substances such as hydrolysis products existing on the stainless steel fiber sintered felt will dissolve in the hot ethylene glycol, while impurity particles such as coke that are not easy to melt will be taken out by the circulating fresh hot ethylene glycol, causing the color and transparency of the ethylene glycol solution to change. By observing the color and transparency changes of ethylene glycol, it can be checked whether the melt filter element will affect the color and transparency of the melt after being installed on the machine.

[0028] Beneficial Effects

[0029] The utility model is a melt filter cleaning effect detection device that uses a centrifugal pump to drive hot ethylene glycol to circulate and flush the filter element, simulating the filtering state of the filter element in normal production. By analyzing the ultraviolet transmittance of the ethylene glycol sample, it can be tested whether the filter element is cleaned properly. It mainly solves the problem that the polyester hue deteriorates for a long time after the polyester melt filter is updated.

[0030] The utility model discloses a melt filter element cleaning effect detection device which can detect the cleaning effect of the melt filter element before it is put into the machine, thus solving the problem that the polyester hue is degraded for a long time after the polyester melt filter element is updated. The inspection process is simple and easy to operate. The detection reagent adopts fresh ethylene glycol which is a raw material in polyester production and the raw material is easy to obtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of a melt filter element cleaning effect detection device of the utility model;

[0032] Among them, 1-precision filter, 2-mounting plate, 3-valve c, 4-centrifugal pump, 5-heating device, 6-expansion tank, 7-valve f, 8-valve g, 9-valve e, 10-low exhaust valve, 11-valve d, 12-valve a, 13-valve c, 14-valve b, 15-pressure gauge, 16-temperature gauge, 17-liquid inlet I, 18-liquid inlet II, 19-liquid outlet I, 20-liquid outlet II, 21-liquid inlet III. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0034] A melt filter element cleaning effect detection device, such as Figure 1 As shown, it includes a precision filter 1, a mounting plate 2, an expansion tank 6, a centrifugal pump 4, a low-discharge valve 10, a heating device 5 and a valve a 12;

[0035] The mounting plate 2 is horizontally arranged inside the precision filter 1, and the cavities of the upper and lower parts of the mounting plate 2 are connected;

[0036] The top of the precision filter 1 is provided with a liquid inlet I17 and a valve e 9, and the bottom is provided with a liquid outlet I19 and a liquid outlet II 20. The liquid outlet I19 is connected to the centrifugal pump 4 and the liquid inlet I17 in sequence through an ethylene glycol pipeline, and the liquid outlet II 20 is connected to the low discharge valve 10;

[0037] A liquid inlet II 18 is provided on the ethylene glycol pipeline between the liquid outlet I 19 and the centrifugal pump 4; a valve d 11 is connected to the ethylene glycol pipeline between the liquid inlet II 18 and the centrifugal pump 4;

[0038] The heating device 5 is a jacketed pipe structure, which is sleeved on the ethylene glycol pipeline between the centrifugal pump 4 and the liquid inlet I17; the end of the heating device 5 close to the liquid inlet I17 is connected to the steam inlet pipeline through the valve b 14, and the end away from the liquid inlet I17 is connected to the steam outlet pipeline through the valve c 13;

[0039] The ethylene glycol pipeline between the liquid inlet I17 and the heating device 5 is connected with a temperature gauge 16.

[0040] A valve a 12 is connected to the ethylene glycol pipeline between the centrifugal pump 4 and the heating device 5; a pressure gauge 15 is connected to the ethylene glycol pipeline between the centrifugal pump 4 and the valve a 12;

[0041] The lower end of the expansion tank 6 is connected to the liquid inlet II 18 through the ethylene glycol pipeline, and the lower end of the expansion tank 6 is located higher than the precision filter 1 in the vertical direction;

[0042] The upper part of the expansion tank 6 is provided with a liquid inlet III 21, which is connected to the ethylene glycol pipeline through a valve f 7;

[0043] The top of the expansion tank 6 is connected to a degassing pipeline, on which a valve g 8 is provided.

[0044] The working process of this device:

[0045] (1) Close all valves; take 91 melt filter elements after the cleaning process, connect 19 of them to the mounting plate 2 in the precision filter 1 through threads, and keep the remaining melt filter elements for standby;

[0046] (2) Open valve f7, valve g8, valve e9, valve d11, and valve a12; allow fresh ethylene glycol to flow into the expansion tank 6 through valve f7, and then fill the expansion tank 6 into the precision filter 1 and the ethylene glycol pipeline. When fresh ethylene glycol flows out of valve e9, stop filling immediately; the amount of fresh ethylene glycol in the circulation system (i.e., the precision filter 1, the ethylene glycol pipeline between the precision filter 1 and the centrifugal pump 4, and the ethylene glycol pipeline between the centrifugal pump 4 and the precision filter 1) is 500L;

[0047] (3) First close valve f 7 and valve e 9, then close valve a 12, start centrifugal pump 4, and after the pressure value displayed by the pressure gauge 15 at the outlet of centrifugal pump 4 stabilizes, open valve a 12 to allow fresh ethylene glycol to circulate in the system through the drive of centrifugal pump 4;

[0048] (4) Open valve b 14 and valve c 13 to allow steam to flow through the jacket pipe to heat the circulating fresh ethylene glycol; when the temperature value displayed by the thermometer 16 reaches the set temperature of 140°C, close valve b 14 and valve c 13; in the precision filter 1, the fresh hot ethylene glycol flows from one side of the stainless steel fiber sintered felt of the filter element to the other side, and the centrifugal pump 4 is turned off after circulating for 2 hours;

[0049] (5) Open the low exhaust valve 10, take the ethylene glycol sample with a beaker, use an ultraviolet spectrophotometer to perform ultraviolet transmittance analysis on the ethylene glycol sample, carefully clean the cuvette (quartz material), perform difference correction on the cuvette, inject distilled water into the reference cell, inject the ethylene glycol sample to be tested into the sample cell, measure the ultraviolet transmittance of the ethylene glycol sample at 220nm, 275nm, and 350nm, and the transmittance test results are: ≥70.0% (220nm), ≥90.0% (275nm), ≥95.0% (350nm), all of which are qualified and meet the requirements for the machine (if "≥70.0% (220nm), ≥90.0% (275nm), ≥95.0% (350nm)" are not met, it is unqualified and does not meet the requirements for the machine);

[0050] In order to verify whether the detection results of the melt filter element cleaning effect detection device of the utility model are accurate, the utility model directly puts the spare melt filter element on the machine. The test shows that the spare melt filter element has no effect on the color and transparency of the melt after being put on the machine. Therefore, it can be known that the detection results of the melt filter element cleaning effect detection device of the utility model are accurate.

Claims

1. A melt filter element cleaning effect detection device, characterized in that: It comprises a precision filter (1), a centrifugal pump (4), a low-discharge valve (10), a heating device (5) and a valve a (12); The top of the precision filter (1) is provided with a liquid inlet I (17), and the bottom is provided with a liquid outlet I (19) and a liquid outlet II (20), and the liquid outlet I (19) is connected to the centrifugal pump (4) and the liquid inlet I (17) in sequence through an ethylene glycol pipeline; The heating device (5) is sleeved on the ethylene glycol pipeline between the centrifugal pump (4) and the liquid inlet I (17); A liquid inlet II (18) is provided on the ethylene glycol pipeline between the liquid outlet I (19) and the centrifugal pump (4); A valve a (12) is connected to the ethylene glycol pipeline between the centrifugal pump (4) and the heating device (5); The low discharge valve (10) is connected to the liquid outlet II (20).

2. A melt filter element cleaning effect detection device according to claim 1, characterized in that: Also includes a mounting plate (2); The mounting plate (2) is horizontally arranged inside the precision filter (1), and the cavities of the upper and lower parts of the mounting plate are connected.

3. A melt filter element cleaning effect detection device according to claim 2, characterized in that: The heating device (5) is a jacketed tube structure; The end of the heating device (5) close to the liquid inlet I (17) is connected to the steam inlet pipeline through a valve b (14), and the end away from the liquid inlet I (17) is connected to the steam outlet pipeline through a valve c (13); A temperature meter (16) is connected to the ethylene glycol pipeline between the liquid inlet I (17) and the heating device (5).

4. A melt filter element cleaning effect detection device according to claim 3, characterized in that: A pressure gauge (15) is connected to the ethylene glycol pipeline between the centrifugal pump (4) and the valve a (12).

5. A melt filter element cleaning effect detection device according to claim 4, characterized in that: A valve d (11) is connected to the ethylene glycol pipeline between the liquid inlet II (18) and the centrifugal pump (4).

6. A melt filter element cleaning effect detection device according to claim 5, characterized in that: The top of the precision filter (1) is also connected to a valve e (9).

7. A melt filter element cleaning effect detection device according to claim 6, characterized in that: The melt filter element cleaning effect detection device also includes an expansion tank (6); The lower end of the expansion tank (6) is located vertically higher than the precision filter (1); The lower end of the expansion tank (6) is connected to the liquid inlet II (18) through an ethylene glycol pipeline.

8. A melt filter element cleaning effect detection device according to claim 7, characterized in that: A liquid inlet III (21) is provided at the upper portion of the expansion tank (6), and the liquid inlet III (21) is connected to the ethylene glycol pipeline via a valve f (7).

9. A melt filter element cleaning effect detection device according to claim 8, characterized in that: The top of the expansion tank (6) is connected to a degassing pipeline, and a valve g (8) is provided on the degassing pipeline.

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