CN109731830B - Cleaning method for deposited high-molecular resin component - Google Patents

Abstract

The invention discloses a cleaning method for a deposited high-molecular resin component, and relates to the technical field of cleaning methods. The cleaning method for the component deposited with the high molecular resin comprises the steps of placing the component deposited with the high molecular resin in cleaning steam, and cleaning for 4-24 h; placing the component cleaned by steam in an aerobic environment at the temperature of 350-450 ℃; wherein the temperature of the cleaning steam is 280-500 ℃; preferably 280-450 ℃. Through steam degradation and oxidation, the polymer resin materials on the surfaces of the filter and other equipment are effectively cleaned. In addition, the inventor can remove the high molecular resin material on the surface of the component more thoroughly by optimizing the temperature and the treatment time in two steps.

Description

Cleaning method for deposited high-molecular resin component

Technical Field

The invention relates to the technical field of cleaning methods, in particular to a cleaning method for a deposited high-molecular resin member.

Background

High polymer resin materials (such as polyester, polypropylene, nylon, polyethylene and the like) are generally used in equipment such as filters, and a large amount of high polymer resin is accumulated in the equipment after the equipment is used, and the equipment can be recycled after being cleaned. The chemical resistance of the polymer resin is good, so that the equipment deposited with the polymer resin material is difficult to clean.

The prior cleaning method is generally cleaning with a chemical solvent (such as triethylene glycol). Has the following defects: (1) the cleaning effect is not ideal after cleaning with a chemical solvent, and carbides and other impurities are often remained; (2) the discharge contains a large amount of organic solvent, which pollutes the environment.

Disclosure of Invention

The invention aims to provide a cleaning method for a deposited high-molecular resin member, which aims to ensure the cleaning effect, reduce the operation cost and avoid the pollution of an organic solvent to the environment.

The technical problem to be solved by the invention is realized by adopting the following technical scheme.

The invention provides a cleaning method for a deposited high-molecular resin component, which comprises the following steps:

placing the component deposited with the high molecular resin in cleaning steam, and cleaning for 4-24 h;

placing the component cleaned by steam in an aerobic environment at the temperature of 350-450 ℃;

wherein the temperature of the cleaning steam is 280-500 ℃; preferably 280-450 ℃.

The embodiment of the invention provides a cleaning method for a deposited high-molecular resin member, which has the beneficial effects that: the high molecular resin material on the surface of equipment such as a filter is effectively cleaned by performing steam degradation and then oxidation on a component deposited with the high molecular resin. In addition, the inventor can remove the high molecular resin material on the surface of the component more thoroughly by optimizing the temperature and the treatment time in two steps.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a cleaning apparatus according to an embodiment of the present invention.

Icon: 100-a cleaning device; 110-a steam generating assembly; 111-a steam generator; 112-an off-gas burner; 113-a steam heater; 120-steam cleaning furnace; 122-a support frame; 123-a holding container; 130-an end cap; 141-electric trolley.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The following is a detailed description of the cleaning method for depositing a polymer resin member according to an embodiment of the present invention.

The embodiment of the invention provides a cleaning method for a deposited high-molecular resin member, which comprises the following steps:

s1, steam degradation stage

The component deposited with the high molecular resin is placed in cleaning steam, the high molecular resin is melted after being heated by regulating the temperature of the steam, and is degraded after contacting with water vapor, so that the high molecular resin is changed into small molecules and finally decomposed into gas.

Wherein the temperature of the cleaning steam is 280-500 ℃; preferably 280-450 ℃. The pressure of the cleaning steam is 2-8 bar; preferably 3 to 6 bar. The washing time in the washing steam is 4-24h, preferably 12-18 h. In the steam degradation stage, the temperature and the steam pressure of the steam have obvious influence on the degradation effect, the degradation effect is not ideal due to the fact that the temperature and the steam pressure of the steam are too low, the requirements for equipment are improved due to the fact that the temperature and the pressure of the steam are too high, and the process cost is also increased. The inventors have found that it is preferable to control the temperature, pressure and cleaning time of the cleaning steam within the above-mentioned ranges, and the process cost can be reduced while ensuring the cleaning effect under the process conditions.

Referring to fig. 1, the cleaning method provided in the embodiment of the present invention may include the following steps: the member deposited with the polymer resin is placed on thesupport frame 122 in thesteam cleaning furnace 120, and the steam generated from thesteam generating assembly 110 is introduced into thesteam cleaning furnace 120 for steam cleaning for 4-24 hours. Preferably, during the steam cleaning process, the polymer resin on the member is melted and degraded, the generated waste liquid enters theholding container 123 below the supportingframe 122, and the generated waste gas is discharged after being introduced into the wastegas combustion furnace 112 for combustion. Organic gas generated by degrading the high molecular resin is fully combusted and then discharged into the atmosphere, so that the discharged gas is pollution-free, and simultaneously, heat generated by gas combustion can be reused.

Preferably, thesteam washing oven 120 is supplemented with steam in a pulsed manner to better regulate the amount of steam in thesteam washing oven 120.

Preferably, thesteam generating module 110 generates steam by using thesteam generator 111, and the steam is preheated in the wastegas combustion furnace 112 through a coil pipe at the top of the wastegas combustion furnace 112, and then is introduced into thesteam heater 113 to be reheated and introduced into thesteam cleaning furnace 120. The steam generated in thesteam generator 111 is introduced into the wastegas combustion furnace 112 to be preheated, so as to fully utilize the heat released by the combustion of the organic matter. Wherein, the temperature of the water vapor generated in thesteam generator 111 is 120-150 ℃, the temperature of the water vapor passing through thesteam heater 113 is 280-450 ℃, and the pressure is 3-6 bar. The steam generated in thesteam generator 111 has a low temperature and needs to be preheated and reheated to meet the demand of the cleaning air.

In some embodiments, the end of the supportingframe 122 is fixed to theend cover 130 of thesteam cleaning furnace 120, and the outer wall of theend cover 130 is connected to theelectric trolley 141, and theelectric trolley 141 is used to control the opening or closing of theend cover 130, so as to pull or push the supportingframe 122 out of or into thesteam cleaning furnace 120. In this way, the device to be cleaned can be more conveniently placed and removed, and the specific connection relationship can refer to the description of the device in the embodiment of the invention.

S2, oxidation stage

Placing the component cleaned by steam in an aerobic environment at the temperature of 350-450 ℃; the oxidation time in an aerobic environment is 5-8 h. The inventor finds that the temperature in the oxidation stage is preferably slightly lower, and the effect is best under the temperature condition of 430 ℃, which is mainly because the residual impurities can be effectively removed under the temperature condition of about 430 ℃ in the oxidation stage, and the oxidation effect is better when the temperature is 350-450 ℃.

In an embodiment of the present invention, the operation of the oxidation stage may be: stopping introducing the steam after the steam cleaning is finished, introducing air into thesteam cleaning furnace 120, and controlling the temperature in thesteam cleaning furnace 120 to be 350-450 ℃. The operation of two stages of degradation and oxidation is completed by adopting single equipment, so that the equipment investment cost and the cleaning process time are obviously reduced.

The features and properties of the present invention are described in further detail below with reference to examples.

Note that: (1) the following examples and comparative examples were carried out to clean filters having substantially the same working environment and working time, and the polymer resin was mainly polyester. (2) In the following embodiments, steam is supplemented to the steam cleaning furnace in a pulse mode, waste liquid generated by degradation of polymer resin on a component in the steam cleaning process enters a containing container below a support frame, and generated waste gas is introduced into a waste gas combustion furnace to be combusted and released. (3) The steam is generated by utilizing a steam generator to generate steam, the steam is preheated in the waste gas combustion furnace through a coiled pipe at the top of the waste gas combustion furnace, and then the steam is introduced into a steam heater for reheating and then introduced into a steam cleaning furnace.

Example 1

The embodiment provides a cleaning method for a deposited polymer resin member, which comprises the following steps:

and placing the filter deposited with the high molecular resin on a support frame in a steam cleaning furnace, introducing steam generated by the steam generation assembly into the steam cleaning furnace for steam cleaning for 4 hours, and controlling the temperature of the steam entering the steam cleaning furnace to be 500 ℃ and the pressure to be 2 bar. After the steam cleaning is finished, steam is not stopped, air is introduced into the steam cleaning furnace (the ratio of the steam to the oxygen is kept to be about 9: 1), the temperature in the steam cleaning furnace is controlled to be 350 ℃, and the oxidation time is 5 hours.

Example 2

The embodiment provides a cleaning method for a deposited polymer resin member, which comprises the following steps:

and placing the filter deposited with the high molecular resin on a support frame in a steam cleaning furnace, introducing steam generated by the steam generation assembly into the steam cleaning furnace for steam cleaning for 24 hours, and controlling the temperature of the steam entering the steam cleaning furnace to be 280 ℃ and the pressure to be 6 bar. After the steam cleaning is finished, steam is not stopped, air is introduced into the steam cleaning furnace (the ratio of the steam to the oxygen is kept to be about 9: 1), the temperature in the steam cleaning furnace is controlled to be 450 ℃, and the oxidation time is 8 hours.

Example 3

The embodiment provides a cleaning method for a deposited polymer resin member, which comprises the following steps:

and placing the filter deposited with the high molecular resin on a support frame in a steam cleaning furnace, introducing steam generated by the steam generation assembly into the steam cleaning furnace for steam cleaning for 12 hours, and controlling the temperature of the steam entering the steam cleaning furnace to be 450 ℃ and the pressure to be 3 bar. After the steam cleaning is finished, steam is not stopped, air is introduced into the steam cleaning furnace (the ratio of the steam to the oxygen is kept to be about 9: 1), the temperature in the steam cleaning furnace is controlled to be 380 ℃, and the oxidation time is 6 hours.

Example 4

The embodiment provides a cleaning method for a deposited polymer resin member, which comprises the following steps:

and placing the filter deposited with the high molecular resin on a support frame in a steam cleaning furnace, introducing steam generated by the steam generation assembly into the steam cleaning furnace for steam cleaning for 18h, and controlling the temperature and the pressure of the steam entering the steam cleaning furnace to be 450 ℃ and 6 bar. After the steam cleaning is finished, steam is not stopped, air is introduced into the steam cleaning furnace (the ratio of the steam to the oxygen is kept to be about 9: 1), the temperature in the steam cleaning furnace is controlled to be 380 ℃, and the oxidation time is 6 hours.

Comparative example 1

The present comparative example provides a cleaning method (existing deposition method) for depositing a polymer resin member, specifically including the steps of:

the first step is as follows: and (4) cleaning the organic material. Pouring triethylene glycol liquid into a cleaning container; putting the filter to be cleaned into a container, and locking the container; heating to 283 ℃ from normal temperature; keeping the temperature at 283 ℃, and decomposing the resin by using a solvent; cooling to below 50 ℃, and opening the cleaning container; taking out the filter and washing the filter with water; and (4) recycling triethylene glycol waste liquid.

The second step is that: and (4) vacuum calcining and cleaning. Impurities and carbides still remain in the disc after the organic solvent cleaning is finished, and the components cannot be oxidized; putting the filter disc cleaned by the organic solvent into a vacuum calcining furnace; vacuumizing the vacuum calcining furnace, then heating for calcining, and heating to 350-450 ℃; and after the calcination is finished, cooling the temperature to normal temperature and taking out the filter.

The cleaning time was 3 days in total using the treatment method of comparative example 1.

Comparative example 2

This comparative example provides a cleaning method for a deposited polymer resin member, which comprises substantially the same steps as in example 2, except that: the temperature of the steam degradation stage was 250 ℃.

Comparative example 3

This comparative example provides a cleaning method for a deposited polymer resin member, which comprises substantially the same steps as in example 2, except that: the temperature of the steam degradation stage was 600 ℃.

Comparative example 4

This comparative example provides a cleaning method for a deposited polymer resin member, which comprises substantially the same steps as in example 2, except that: the temperature of the oxidation stage was 200 ℃.

Comparative example 5

This comparative example provides a cleaning method for a deposited polymer resin member, which comprises substantially the same steps as in example 2, except that: the temperature of the oxidation stage was 500 ℃.

Test example 1

The cleaning effect of the filter is tested by adopting a bubble point test method, and the test method comprises the following steps: placing the disc on the instrument, connecting with an air pipe, gradually adjusting the air pressure to about 2466pa, and keeping the pressure at 2466pa +/-10% after 10-20 seconds, thus being qualified. The specific qualified standard refers to GB/T14041.1-93.

After the cleaning methods in examples 1-4 and comparative examples 1-5, examples 1-4 all passed, comparative example 1, comparative example 3 and comparative example 5 also passed, but comparative example 2 and comparative example 4 failed.

Therefore, the cleaning method in the embodiment of the invention can effectively remove the high molecular resin deposited on the filter, the cleaning effect is qualified after several hours of treatment, and compared with the treatment method in the comparative example 1, the cleaning time is obviously shortened. As can be seen from the comparison of example 2 and comparative examples 2 to 5, the temperature control in the two steps has a significant effect on the cleaning effect, and the cleaning effect cannot be achieved at too low a temperature.

Test example 2

The weight of the filter discs after washing in examples 1 to 4 and comparative examples 1 to 5 (both discs used for about 20 days) was tested, and the washing effect of the filter discs was examined in comparison with the weight of the filter discs before use, and the test results are shown in table 1.

TABLE 1 weight test results for each filter disc

Group of	Before use (g)	After cleaning (g)	Weight difference (g)
				Example 1	1531.675	1531.684	0.012
Example 2	1535.712	1535.719	0.014
				Example 3	1532.153	1532.159	0.013
Example 4	1518.874	1518.880	0.012
				Comparative example 1	1520.342	1520.350	0.015
Comparative example 2	1538.731	1538.742	0.021
				Comparative example 3	1519.562	1519.570	0.012
Comparative example 4	1518.492	1518.504	0.016
				Comparative example 5	1525.529	1525.537	0.011

As can be seen from Table 1, the cleaning method in the embodiment of the present invention can clean the material deposited with the polymer resin in a short time, and the difference between the weight after cleaning and the weight before use is less than 0.01g, so the cleaning effect is very good.

It is understood from comparative example 2 and comparative examples 2 to 5 that the cleaning effect is not satisfactory due to the excessively low operating temperatures of the degradation and oxidation steps, and the cleaning effect is not further improved when the operating temperature is beyond the preferred range provided by the present invention. It can be seen that the operating temperature control in both steps is well within the preferred ranges provided in the examples of the present invention.

In summary, the present invention provides a cleaning method for a polymer resin deposited member, which comprises subjecting the member deposited with polymer resin to steam degradation and then oxidation, so as to effectively clean the polymer resin material on the surface of the filter and other devices. The inventors have effectively removed the polymeric resin material from the surface of the member by modifying the temperature and treatment time in two steps.

The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (3)

1. A cleaning method for a deposited polymer resin member, characterized by comprising the steps of:

placing the component deposited with the polymer resin in cleaning steam at the temperature of 280-450 ℃ and at the pressure of 3-6bar, and cleaning for 12-18 h;

placing the member subjected to steam cleaning in an aerobic environment at the temperature of 350-450 ℃ for oxidation for 5-8 h;

the high polymer resin comprises at least one of polyethylene, polypropylene and nylon;

the component deposited with the high molecular resin is a disc of the filter, the component deposited with the high molecular resin is placed on a support frame in a steam cleaning furnace, and steam generated by a steam generating assembly is introduced into the steam cleaning furnace for steam cleaning; the steam cleaning furnace supplements steam in a pulse mode; in the steam cleaning process, the high molecular resin on the component is melted and degraded, the generated waste liquid enters a containing container below the supporting frame, and the generated waste gas is introduced into a waste gas combustion furnace to be combusted and released; fixing the end part of the support frame with an end cover of the steam cleaning furnace, connecting the outer wall of the end cover with an electric trolley, and controlling the opening or closing of the end cover by using the electric trolley so as to pull out or push in the support frame from the steam cleaning furnace;

and stopping introducing steam after the steam cleaning is finished, introducing air into the steam cleaning furnace, and controlling the temperature in the steam cleaning furnace to be 350-380 ℃.

2. The cleaning method for depositing a polymeric resin member as claimed in claim 1, wherein the steam generating module generates steam using a steam generator, the steam is preheated in the exhaust gas combustion furnace through a coil pipe at the top of the exhaust gas combustion furnace, and then is introduced into the steam cleaning furnace after being reheated in a steam heater.

3. The method as claimed in claim 2, wherein the temperature of the steam generated in the steam generator is 150 ℃ and the temperature of the steam passing through the steam heater is 450 ℃ and the pressure is 3-6 bar.

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