Extended service life of the cutting tool in the extrusion granulation unit of Yan’an Energy Chemical Polypropylene Plant reaches a new high
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Extended service life of the cutting tool in the extrusion granulation unit of Yanchuan Nenghua’s polypropylene plant – a new record Author/Source: Yanchuan Petroleum Yanchuan Nenghua Date: 2022-04-21 Clicks: 14 As of April 20, the cutting tool in the extrusion granulation unit of Yanchuan Petroleum Yanchuan Nenghua’s olefin polymerization center had been in use for 124 consecutive days without any issues, setting a new record for the longest operational time since the installation of this unit. In actual production, the extrusion granulators in polypropylene plants are prone to cutter wear. Moreover, the significant differences in physical properties among products of different grades also exacerbate cutter wear in these extrusion granulators, resulting in substandard particle cutting and affecting product quality. In severe cases of cutter damage, there is a risk of unplanned plant shutdowns. Based on past operating experience, the average replacement cycle for the cutting knives in the extrusion granulator is about two months, with the cost of each cutting knife being around 100,000 yuan. In response, the olefin polymerization center, taking into account the actual conditions of the polypropylene plant, included \"extending the service life of the extrusion granulator cutters\" as a key item in the center’s QC activities. The technical staff conducted thorough research and, based on the material properties of products of different grades, continuously optimized process parameters in various aspects such as the temperature of the extruder barrel, the opening degree of the throttle valve, the inlet pressure of the melt pump, the pressure applied during tool insertion and removal, the temperature of the water used for granulation, and the pH level, in order to further reduce the wear rate of the cutting tools. By extending the service life of the cutting knives, not only is the visual quality of the product pellets ensured, but material costs associated with the cutting knives are also reduced, thereby achieving cost savings and improved efficiency. This facilitates the long-term stable operation of the equipment and helps to maximize profitability. The continuous improvement in the service life of the cutting blades in the extrusion granulator is a testament to the ongoing enhancement of the performance of our equipment.
Based on past operating experience, the average replacement cycle for the cutting knives in the extrusion granulator is about two months, with the cost of each cutting knife being around 100,000 yuan.
A new knife every 2 months? ? That’s a bit exaggerated, I used a cutting tool like that for a whole year{:3_46:}
Which manufacturer’s extrusion granulation unit are you using? What is the yield? Can a cutting board last for a year?
JSW, 200,000 tons – it depends on the grade of product; 1 coil per 2 months seems a bit excessive
For Nippon Steel’s units, can the cutting tool last a year? Do you do intermittent granulation?
I’m not very knowledgeable; it’s the first time I’ve heard of the concept of gap granulation {:2_30:}. I searched on Baidu, and we use normal contact granulation. I have more questions – doesn’t gap granulation cause problems with the pellets? Even wrapping around the knife
I’ve only seen the method of granulation with gaps; we use direct contact granulation as well. But the idea that the cutting blades can last for a year really goes beyond what I know – it’s the first time I’ve heard that cutting blades can be used for such a long time. Perhaps the grades you produce are quite stable, with no frequent changes, which may result in cutting blades having a higher hardness
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Extruders are quite mysterious – with the same process and the same equipment, the operating parameters can still vary: lol