ACCU-CHILL® LXC Cryogen Injection Cooling

cryogen bottom injection system using liquid nitrogen or carbon dioxide

The new valve is a great start

The ACCU-CHILL® LXC cryogen bottom-injection system provides rapid, precise temperature reduction during batch mixing or blending. At the heart of the system is the patent-pending valve-nozzle assembly. The valve component is a fail-close, all stainless-steel, inline valve for cryogenic service. The nozzle component automatically closes once the cryogenic liquid has been injected to create a smooth surface along the inside blender wall. This self-closing mechanism thus minimizes the risk of food particles or residue getting trapped in the nozzle opening which can cause nozzle blockage or cross-contamination between batches. The flush-close nozzle makes sanitation easy and effective. The entire valve-nozzle assembly is pneumatically actuated, compact, robust, and requires the smallest of vessel penetrations. This same valve-nozzle assembly functions in the same manner for either liquid nitrogen or liquid carbon dioxide.

Cryogen in the ideal condition

The ACCU-CHILL LXC system is a complete application of various interdependent components comprising the entire system with each component playing a vital role. The valve-nozzle assembly is only one of the important components of the complete ACCU-CHILL LXC system. Cryogen conditioning plays a vital role in the performance and consistency of the LXC system. A properly conditioned liquid cryogen system that minimizes the gas vapor volume in the make-up of the cryogen liquid is vital to consistent and efficient chilling of the product in the mixer or bender. Linde conditions the cryogen as part of the system to minimize multiple batch temperature checks and additional cooling steps to reduce batch mixing times.

Focused on success

Perhaps the most important component of the ACCU-CHILL LXC system is the overall system design. During cooling, a high volume of liquid cryogen is needed at the mixer. Once the cooling cycle is complete, the flow of cryogen stops and does not resume until the next cooling cycle. Alternating between high-flow and no-flow several times per hour can be challenging, but the entire Linde cryogen injection system is purposefully developed to achieve the desired results at the mixer and minimize disruption between high-flow and no-flow changeovers. From the storage vessel through the delivery pipeline into the mixer and out the exhaust, the entire system is carefully sized to work consistently from batch to batch.