PP Multi-Sphere

Product Model	Multi-purpose Hollow Ball Packing Series
Category	PP Molded Products
Reference Price	Price on request

Hot Customizable for Working Conditions 11 Technical Parameters

Product Overview

PP Multi-Sided Ball, also known as Multi-Sided Hollow Ball, is a hollow spherical plastic bulk packing with a hollow center. The ball body is composed of multiple semi-circular blade sections and reinforcing ribs, with an outer contour in the shape of a sphere and an internal hollow structure. The multi-sided balls are randomly piled in scrubbers, absorbers, and purifiers. Waste gas and absorbent flow through the internal and inter-ball gaps, achieving efficient gas-liquid contact and mass transfer.

The hollow structure of the multi-sided hollow ball enables it to have a high void ratio and resistance to blockage. It is suitable for air scrubbing, waste gas absorption, and dust filtration engineering applications with large airflow and low resistance. Due to the high liquid retention in the ball voids, the residence time of the liquid in the packing layer is extended, increasing the contact area and time between the gas and liquid, thereby achieving more thorough waste gas absorption treatment.

The PP Multi-Sided Balls supplied by Xicheng Environmental Protection are molded by polypropylene injection molding, offering acid and alkali resistance, lightweight, and good strength. The blades have elasticity, making them less prone to breakage during installation and operation. The product is available in various ball diameter specifications. Smaller ball diameters provide a larger specific surface area, while larger ball diameters offer higher void ratios and better blockage resistance. They can be selected based on tower diameter, gas volume, and pollutant characteristics, or combined with other packings such as Raschig rings.

Working Principle

The purification principle of multi-sided balls involves the repeated contact between gas and liquid phases on the surface and inside the hollow balls. The absorbent is sprayed from top to bottom, forming liquid films on the ball surfaces and retaining in the internal cavities. Waste gas flows upward through the porous bed formed by a large number of piled balls. The airflow changes direction multiple times within and between the balls, fully contacting the liquid films and retained liquid droplets, capturing pollutants with the absorbent and carrying them down with the liquid flow.

The hollow structure is the key to the high performance of multi-sided balls. The spherical outer contour naturally forms numerous interconnected large voids during packing, ensuring smooth gas channels, low pressure drop, and resistance to blockage by dusty gas. The internal cavity and blades of each ball provide a large specific surface area and liquid retention, with the liquid briefly staying inside the ball, effectively creating numerous micro-reaction spaces in the packing layer, thereby improving absorbent utilization and purification efficiency.

Structural Composition

Each multi-sided ball is formed by the snap-fit of two hemispherical blade structures or molded as a whole. The ball surface is distributed with multiple arc-shaped blades and windows, hollow in the middle, with reinforced nodes formed at the blade intersections. The ball body has no solid wall, allowing gas to enter from any direction. The blades not only increase the film formation area but also guide and disturb the airflow, promoting turbulent gas-liquid contact.

The packing bed is formed by randomly piled multi-sided balls, with point contact between the balls and interconnected voids. It is supported at the bottom by grating plates or porous plates, with the support plate openings smaller than the ball diameter to prevent ball leakage. Due to the spherical shape of the packing, which tends to roll, pressure plates or baffles should be installed above the bed under high gas velocity conditions. Multi-sided balls can be loaded into the entire tower or layered at different heights, with redistributors installed between layers to improve liquid distribution.

Specification Model Table

The following table provides a general comparison of the ball diameter specifications and their applicable characteristics. Specific parameters should be determined by selection calculations.

Ball Diameter Specification	Performance Characteristics	Applicable Cases
Small Diameter	Large Specific Surface Area	Clean Gas Efficient Absorption
Medium Diameter	Balanced Efficiency and Resistance	General Waste Gas Scrubbing
Large Diameter	Large Voids and Blockage Resistance	Dusty Gas Pre-treatment

Product Features

PP Multi-Sided Balls have a high void ratio, significant liquid retention, and thorough gas-liquid contact, making them an efficient waste gas scrubbing packing. The main features are as follows.

Hollow and open structure, high void ratio, low ventilation resistance
Large liquid retention in the ball, extending gas-liquid contact time
Large blade film formation area, high absorption and purification efficiency
Large channels resistant to blockage, suitable for dusty gas treatment
PP injection molded, acid and alkali resistant, with elastic blades
Spherical packing with good fluidity, easy installation and replacement
Lightweight, reducing support structure and tower load

Material	PP Polypropylene
Molding Process	Injection Molding
Appearance	Hollow Spherical Structure
Filling Method	Improperly stacked loading
Corrosion resistance performance	Acid-alkali-resistant salt
Structural Features	Large gap, large liquid retention
Support Component	Grid Plate / Perforated Plate
Purpose	Exhaust Gas Absorption Scrubber Packing
Color	White / Gray
Ball diameter specifications	Multiple diameter options available
Stacking Method	Randomly stacked bulk materials

Application Industries

Plating and surface treatment acid-alkali exhaust gas scrubber packing
Chemical acid mist and alkaline gas absorption purification tower packing
Semiconductor plant ammonia and fluoride-containing exhaust wet treatment packing
Metallurgical acid pickling and metal smelting flue gas purification packing
Paint and printing exhaust water washing pre-treatment packing
Wastewater treatment plant odor gas biological scrubbing packing
Dust removal and desulfurization tower gas-liquid contact mass transfer packing

Typical Process Location

Multi-faced balls are loaded in the packing section of scrubbing towers and absorption towers, located below the spray nozzles and above the inlet, supported at the bottom by grating plates or porous plates with openings smaller than the ball diameter. Gas flows upward through the multi-faced ball bed, while absorption liquid sprays downward from above, completing gas-liquid countercurrent contact within and between the balls. Cleaned gas is discharged after demisting, and the liquid absorbing pollutants returns to the sump for recycling.

In dust-containing exhaust gas treatment processes, multi-faced balls are often arranged in the pre-washing section, utilizing their large voids and liquid retention characteristics to capture dust and sticky particulates, reducing the risk of blockage in subsequent high-efficiency packing. During loading, balls are evenly poured and leveled through manholes, and a pressure plate is laid on the bed surface to prevent the balls from being carried away by airflow. During maintenance, balls can be removed for cleaning, and damaged or deformed balls are removed and replaced with new ones. Before loading, ensure ball diameter matches the tower diameter and spray density, balls are clean and free of fragments, and are evenly poured and leveled to the design height to avoid localized accumulation affecting gas-liquid distribution. During operation, blockage and breakage are monitored through sight glasses and pressure differentials, and balls are regularly removed for cleaning. Deformed, cracked, and undersized old balls are removed and replaced with new ones in proportion to restore the bed surface smoothness.

Under similar specifications and loading conditions, multi-face hollow balls exhibit higher voidage, more unobstructed gas channels, typically lower bed resistance, and allow for greater processing air capacity with enhanced anti-blocking and anti-fouling capabilities. Raschig rings feature a simple structure and lower cost, but when randomly stacked, some internal channels within the rings may be obstructed, resulting in slightly higher resistance and relatively lower throughput. Multi-face balls offer greater advantages when Pursuit low pressure drop, high flow rate, or when the gas contains dust or viscous substances; Raschig rings are more practical when Pursuit mature reliability, cost-effectiveness, and when the gas is relatively dirty. The mass transfer efficiency of both materials is also influenced by spray density, liquid distribution, and bed height, and should not be evaluated solely based on the packing itself. Selection should consider tower diameter, free-tower gas velocity, liquid-to-gas ratio, and pollutant characteristics comprehensively. When necessary, allow the design to perform separate calculations for resistance and efficiency, or combine the two types of packing in layers within the same tower.

The multi-sphere balls are spherical and lightweight. Under high gas velocity, especially during fan startup, valve sudden opening, or load fluctuation, the upper spheres in the bed may be lifted, rolled, or fluidized by the airflow, leading to long-term wear and carryover. Therefore, the design requires controlling the empty tower gas velocity within the allowable range of the packing and not exceeding the fluidization point gas velocity of the packing. Pressure plates, pressure grids, or limiting gratings should be installed above the packing layer to confine the balls within the bed. During fan startup, the air damper should be closed slightly, and the air volume should be adjusted slowly to avoid instantaneous airflow impact on the bed. Avoid frequent and large load fluctuations during operation. A small clearance should be left between the pressure plate and the packing to limit the upward floating without crushing the balls. If balls are still carried into the demisting section, review whether the air volume exceeds the standard or the pressure plate gap is too large, and supplement a pressure grid above.

Diameter selection should balance purification efficiency, bed resistance, and tower diameter compatibility. Small balls have a larger specific surface area, ensuring thorough gas-liquid contact and high efficiency, but with relatively smaller voids, higher resistance, and a greater tendency to be clogged by dust and crystallization. Large balls offer larger voids, better anti-clogging performance, and higher throughput, but with a smaller specific surface area per unit volume and slightly lower efficiency. For clean gas and high purification requirements, choose smaller balls; for dusty, sticky, or low-pressure drop, high-flow scenarios, select larger balls. The ball diameter should maintain a reasonable ratio with the tower diameter. If the tower diameter is too small while the ball diameter is too large, severe wall and channel flow will occur, concentrating gas and liquid near the tower wall, significantly reducing the effective mass transfer area. In the same tower, smaller balls can be installed in the upper section, while larger balls in the lower section, with the lower section providing anti-clogging performance and the upper section for fine treatment. After determining the ball diameter, calculate the packing height, support grille openings, and plate gaps accordingly.

Yes. Multi-sphere media features large voids and moderate liquid retention, providing ample surface area for microbial attachment both internally and externally. The voids ensure smooth gas passage, making it a common choice for biological carriers in bio-washing and bio-filter odor removal equipment. When used in biofilm processes, select media with surfaces conducive to attachment, material resistant to aging and biological corrosion, while ensuring uniform nutrient supply, temperature, and spray distribution to achieve consistent biofilm coverage across the bed. During operation, control biofilm thickness by adjusting spray volume and performing regular rinsing to prevent blockage and anaerobic conditions caused by excessive film buildup. The packing height of the media and gas-liquid residence time must meet odor load and compliance requirements, with pre-treatment needed if inlet concentrations are excessively high. The decision to use multi-sphere media should be based on the residence time, volumetric loading, and attachment method of the biological process.

Polymer Multi-Sphere is not easily broken under normal temperature and proper filling conditions. Breakage usually occurs due to several factors:Dip from manhole height during filling, excessive drop height causing impact; excessively high operating temperature causing material softening and pressure drop; prolonged ultraviolet exposure leading to aging and brittleness; freezing of the filler layer or compression by large crystalline deposits in winter; and insufficient wall thickness or inadequate strength of the sphere itself. Avoid direct introduction of high-temperature flue gas into the packing section; pre-cool when necessary. Control the drop height and spread evenly during filling to reduce impact; select products with sufficient wall thickness and full molding. If broken spheres are detected during operation, shut down the equipment, screen out the fragments, and replenish new spheres to prevent Scrap and Cell Splitter from blocking the downstream grille, spray pipes, and circulation pipelines. Regularly removing and inspecting the filler can determine the degree of aging and crystallization, allowing for batch replacement.

The increase in packing layer resistance is usually caused by the blockage of spheres and voids by dust, crystals, or biological sludge, or by the accumulation of污垢 on the pressure plates above the bed or in the demisting section, narrowing the gas passage. First, strengthen the filtration of circulating liquid and front-end dust and mist removal at the source to reduce impurities entering the packing. During operation, periodically increase the rinsing volume to flush the bed and dislodge surface-attached substances. After shutdown, use high-pressure water from the manway to flush each layer from top to bottom. If necessary, remove the spheres and clean them outside the tower, screen them, and remove damaged, deformed, or heavily scaled spheres, replenishing an equal amount of new spheres. Crystallization of soluble salts can be treated by circulating a dilute acid or dilute alkali compatible with the material and medium for cleaning, followed by thorough rinsing with clean water. After treatment, refill and level the packing uniformly according to specifications and install the pressure plates. The resistance generally recovers significantly. If the resistance remains high after cleaning, it indicates aging or plate结 of the packing, and the entire layer should be replaced.

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