Dosing System

The Anhydro Dosing System delivers precise nitrogen or carbon dioxide dosing directly into the high-pressure feed line, giving producers accurate control over bulk density and essential powder properties. Designed for spray drying lines handling coffee, dairy, infant nutrition and sugar-based products, it maintains high dosing accuracy even at low gas rates, helping achieve consistent product quality batch after batch.

With three control modes (manual, fixed flow rate and proportional flow rate), PLC integration and an optional hygienic, CIPable design, the compact Anhydro Dosing System fits easily into existing or new installations. Its simple operation and low maintenance needs support stable production, while controlled gas injection helps reduce process variability and product losses.

GET PRICING

Features & Benefits

The Anhydro Dosing System enables exact dosing of gas (N₂ or CO₂) into the high-pressure feed line.

Benefits

Homogeneous powder bulk density
Precise control of essential powder properties
Wide range of gas dosing capacities
High accuracies – even in dosing rates as low as 30 g CO₂/h / 1.2 oz CO₂/h
Three control modes – manual, fixed flow rate and proportional flow rate
Available up to 500 bar / 7,252 psi (standard 300 bar / 4,351 psi)
PLC integration

Suitable for multiple products
Remote access available for site support
Dosing after the high pressure pump (high pressure dosing)
Simple installation and operation
Minimum maintenance requirements
Compact and mobile design
Option: Hygenic Design - CIP’able version

Benefits and features when using N₂ / CO₂
Product	Dosage Guide Value* [%]	Bulk Density	Colours (Product Whitening)	Partic Size and Shape	Sink-ability	Solu-bility	Angle of Powder	Reduced Pressure
Coffee	0.2-1.2	X	X
Coffee Whitener	0-0.6	X		X	X
Cappuccino (Basic Material)	0.3-0.8	X
Ice Coffee (90% Sugar)	0.3-0.6	X			X	X
Sweetener	0.1-0.5	X		X
Baby Food	0.1-0.3	X
Malt and Mixed Malt Products	0.2-1.5	X	X
Ovomaltine	0.2-1.0	X	X					X
Chocolate Drink	0.1-0.9	X	X
Caramel	0.1-0.7	X
Cocoa Drink	0.1-0.7	X
Mile Powder and Milk Basic Products	0.1-0.3	X
Sugar Products	0.1-2.0	X		X			X	X
Plant Extracts	0.1-2.5	X		X				X

_{* Based on mass feed rate}

The Anhydro Dosing System is equipped with a dual supply inlet for gas, which enables switching between the two gas supply tanks without interruption. When supplied, the gas is filtered and is passed through a heat exchanger for temperature control.

Gas Dosing Process

The pressure of the gas is boosted in a high-pressure piston membrane pump. Accurate flow control is achieved by passing the gas through a mass flowmeter. A valve system ensures compliance with safety and venting requirements.

The gas is then directed to the injection nozzle in the dryer product feed line via a flexible hose. The injection nozzle can be positioned minimum 1 meter from the dryer high pressure feed pump and minimum 5 meters from the atomizer nozzle outlets.

The injection unit control system features three control modes: manual, fixed flow rate and proportional flow rate. In the proportional flow rate mode the injection unit mass flowmeter and the flowmeter installed in the feed line are interconnected via the in-house control system and the Anhydro Dosing System control system.

High-Pressure Gas Injection Into Milk Concentrate

The ability of gas to lower milk powder bulk density is governed by the solubility of the gas in the water component of the milk concentrate. The dissolved gas is released from the water component at the point of atomization, forming vacuoles within the individual milk powder particles. Thereby, the particles are “ballooned”, thus reducing the overall bulk density of the powder. The end product is defined by a controlled combination of the quantity of gas, the atomizer nozzle pressure, the feed temperature and viscosity, drying temperature etc.

Dosing System

Benefits

Benefits and features when using N2 / CO2

Gas Dosing Process

High-Pressure Gas Injection Into Milk Concentrate

Benefits and features when using N₂ / CO₂