Cleaning method of melt pipeline and application

A melt pipeline and pipeline technology, which is applied to cleaning methods and utensils, chemical instruments and methods, cleaning hollow objects, etc., can solve the problems of inability to achieve cleaning effect and impermeability of steam, and achieve the reduction of foreign matter, easy operation, and improved product quality. quality effect

Inactive Publication Date: 2019-06-28
YINGKOU KANGHUI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because part of the melt has been degraded and attached to the pipe wall for a long time in the pipe, the steam cannot penetrate, and the ideal cleaning effect cannot be achieved.

Method used

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  • Cleaning method of melt pipeline and application

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Experimental program
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Effect test

Embodiment

[0065] The cleaning method provided in this embodiment specifically includes the following steps:

[0066] 1. Before cleaning, press figure 1 Connect the recirculation lines as shown in the cleaning flow chart.

[0067] 2. Add appropriate amount of triethylene glycol into the cleaning furnace from the feed port through the barrel pump.

[0068] 3. Start the triethylene glycol circulating pump at room temperature, slowly open the pump outlet valve, fill the melt pipeline with triethylene glycol, and when the pipeline is filled and the liquid level in the cleaning furnace no longer drops, check whether there is any leakage in the circulating pipeline. After filling the pipeline, the liquid level in the cleaning furnace tank should not be lower than the heater (the liquid level gauge should not be lower than 25%).

[0069] 4. Turn on the instrument switch of the control cabinet and set the cleaning program:

[0070] Heating stage: the range is as follows, and at the same time,...

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Abstract

The invention provides a cleaning method of a melt pipeline and application. The cleaning method of the melt pipeline comprises the following steps of connecting the melt pipeline with a triethylene glycol furnace; arranging a circulating pump between the melt pipeline and the triethylene glycol furnace; heating triethylene glycol, then circularly cleaning the triethylene glycol in the melt pipeline through the circulating pump, and cooling after cleaning; blowing the triethylene glycol in the pipeline by using steam; and finally introducing desalted water for washing, and finishing the wholecleaning process after washing. According to the cleaning method, the triethylene glycol furnace with the heating function is only required to be connected with the pipeline for cyclic cleaning, the triethylene glycol is used for alcoholysis of material scaling on the inner wall of the melt pipeline, therefore, degradable materials adhered in the pipe wall can be effectively removed, and the product quality is improved; and the method has the advantages of being convenient, simple, and easy to operate, higher in safety and the like.

Description

technical field [0001] The invention relates to the technical field of polyester film preparation, in particular to a cleaning method and application of a melt pipeline. Background technique [0002] In the direct melting biaxially oriented polyester film (BOPET) production process, the inner wall of the melt pipe will have residual melt scaling for a long time. Since the temperature of the melt pipe needs to be kept above 270°C for a long time, the melt remaining in the pipe will It degrades and adheres to the pipe wall, and accumulates for a long time to form degraded and carbonized materials. Once the degraded and carbonized materials enter the melt, they will cause foreign matter in the film and affect the quality of the film. [0003] In the prior art, the principle of hydrolysis of PET melt in high-pressure steam is used to clean the pipeline with high-pressure steam. However, because part of the melt has been degraded and attached to the pipe wall for a long time in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B9/032
Inventor 孙红刚
Owner YINGKOU KANGHUI PETROCHEM
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