除粉器（DeDuster）XD-20 ~ XD-90 系列

除粉器和除尘器的区别

这是被问得很多的问题。两者经常被混为一谈，但服务对象完全不同。

粒料在管道内高速输送时相互摩擦、与管壁碰撞，会产生细粉和拉丝，其中相当一部分因静电吸附在颗粒表面。普通旋风或袋式除尘针对的是气流中的尘粒，对“长在颗粒表面上”的微粉无能为力。两者通常配合使用：除尘器保证排气洁净，除粉器保证产品洁净。

型号与处理能力对照表

XD 系列标准型号的处理能力与外形尺寸如下。处理能力按稳态工况标注，选型时应再按峰值核算并留裕量。

全系列覆盖 10 kg/h~150 t/h；超出表列能力，或有耐磨、抛光、冲洗式等特殊要求的工况，可按工况定制。详细参数见除粉器选型表与粒料除粉器外形尺寸。

实测案例：万华 TPU 破碎片 25 kg 来料测试

第一，10% 是体积占比，不是质量含粉率。破碎片堆密度低、空隙大，同样体积对应的质量远小于粒料；把它当成质量含粉率去推算 ppm 会得出错误结论。报价和验收必须统一到质量口径，并注明取样方式。

第二，除粉后的“看不见”不等于“零”。报告写的是“基本无细小粉尘和细小颗粒”，属于目视与手感判断；若有 15 ppm 硬指标，仍需按约定方法抽检。

第三，TPU 的吸湿性会改变系统配置。普通粒料可用开式正压吹扫；TPU 破碎片吸湿后，若气源直接取环境空气，会在除粉段再次吸湿。报告因此建议闭路循环——这不是除粉器本身必须闭路，而是物料特性倒推的系统条件。

点检与维护

除粉器没有复杂的运动部件，维护重点在气路、除粉腔与滤网。建议按以下周期纳入点检表。

English Version: XD Series Pellet Deduster (DeDuster)

中文版 ↑ · Request a quotation

A pellet deduster removes fine dust and angel hair from the surface of plastic pellets. It is a material-cleaning device, not a dust collector.

During high-speed pneumatic conveying, pellets rub against each other and against the pipe wall, generating fines and angel hair. A large part of this debris adheres to the pellet surface through static electricity. Cyclones and bag filters remove dust entrained in the air stream, but they cannot clean the material surface. Shanghai Conque supplies the XD-20 to XD-90 series for capacities from 10 kg/h to 150 t/h, with integration into dilute-phase, dense-phase and strand-phase conveying systems.

Deduster vs. dust collector

Working principle

Charged particles entering the magnetic zone are subjected to Lorentz forces that weaken the electrostatic adhesion between pellets and fines. A clean, positive-pressure purge air stream then carries the detached dust and angel hair away. Narrow slots and perforated plates provide high angel-hair removal efficiency and make the unit insensitive to normal material-flow fluctuation.

For materials with strong surface static (some PP, PE and TPU grades), ionized air can be used upstream to neutralize the charge. TPU is also hygroscopic: if ambient air is used for purging, the unit removes dust and humidifies the material at the same time. A closed-loop or dried-air supply is then part of the process requirement, not an optional extra.

Model and capacity

The XD series standard models and dimensions are listed below. Capacities are stated for steady-state duty; selection should be based on peak throughput with margin.

The full range covers 10 kg/h to 150 t/h. Duties beyond the table, or requiring wear protection, polishing or wash-down design, can be customized.

Five selection checkpoints

1. Capacity range. Calculate steady-state and peak throughput separately; do not size on the average. XD-20 to XD-90 cover 10 kg/h to 150 t/h, and the peak duty should retain margin.
2. Target fines content. Specify the inlet and allowable outlet fines content. These determine the number of stages and whether series operation is required. PP and PE are often controlled to the 15 ppm level; if the inlet fines content is far above design, adjusting air volume alone will not meet the target.
3. Air supply. Confirm air volume, pressure and whether nitrogen is required. Air-supply fluctuation translates directly into dedusting fluctuation. For hygroscopic materials, confirm closed-loop operation and dew-point control.
4. Installation position. Silo inlet, pre-loading/pre-bagging and end-of-line positions impose different space, pressure-loss, inlet/outlet orientation and maintenance-access requirements.
5. Upstream and downstream matching. Rotary-valve feed stability and downstream dust-collector back pressure both affect performance. Set the parameters together with the valve and dust-collection equipment.

Actual efficiency also depends on residence time, airflow distribution, charge state and particle shape. Flake and regrind materials are harder to handle than spherical pellets and cannot be sized with virgin-pellet data.

Wanhua TPU regrind test: what 10% by volume means

In April 2026, a TPU compounding company sent 25 kg of Wanhua Chemical TPU regrind to our test site. The material was irregular flakes with visibly high dust and chip content. After a run through an RC1 test unit (150-350 kg/h), the sample showed essentially no fine dust or fine particles to the eye, and the collected dust accounted for about 10% of the sample volume.

10% is a volume share, not a mass fines content. Regrind has low bulk density and high voidage, so the same volume corresponds to far less mass than pellets. Converting it directly into mass ppm leads to wrong conclusions; quotations and acceptance tests must use an agreed mass basis and sampling method.

"Invisible" does not mean zero. The report's "essentially no fine dust" is a visual and tactile judgement. If a 15 ppm target applies, sampling must follow the agreed method.

TPU hygroscopicity changes the system configuration. Ambient purge air would re-moisten the material in the dedusting section, so the report recommends closed-loop operation. This is a material-driven system condition, not a requirement of the deduster itself.

Installation positions

• Silo inlet: reduces dust inside the silo and protects the silo-top dust collector.
• Before loading or bagging: directly controls the fines content of the finished product.
• End of the conveying line: acts as the final cleaning unit and is laid out together with terminal dust collection.

When both positions are used, the upstream unit performs coarse dedusting and the terminal unit fine dedusting; pressure loss and space must be calculated separately. If strand-phase conveying is used upstream, dust generation is lower and the terminal load is more stable, but the terminal deduster is still required for incoming fines and changeover residue.

Inspection and maintenance

Frequently asked questions

Selection and quotation

Deduster selection requires confirming throughput, material characteristics and site air-supply conditions item by item. Send us your duty parameters and we will provide an initial model recommendation and interface dimensions.

Website: www.shconque.com | Dilute-phase, dense-phase and strand-phase conveying systems supported.