Does hvp powder production require compressed air?
In the industrial production of HVP powder (hydrolyzed vegetable protein powder), the compressed air system is a key facility to ensure the smooth operation of the production process, and its application runs through multiple core process links. The following explains its technical necessity from a professional perspective:
1. Gas supply for fermentation processes
In the core process of preparing HVP through biological enzymatic hydrolysis, clean compressed air needs to be continuously supplied to the fermentation tank through an air compressor. As an essential substrate for microbial metabolic activities, this gas needs to meet the technical requirements of sterility, oil-free, and constant pressure. A typical fermentation system is equipped with a low-pressure oilless screw air compressor, and the output pressure is stable in the range of 1.8- 2.5 bar to ensure oxygen dissolution efficiency while avoiding damage to bacteria caused by shear force.
2. Powder material conveying system
During the raw material feeding and finished product packaging stages, compressed air serves as a power medium to drive the pneumatic conveying device. Negative pressure is generated through the venturi effect to realize the airtight transportation of powdery raw materials such as vegetable protein powder, effectively preventing the risk of dust explosion. The system requires the air dew point temperature to be lower than-40 ℃ to avoid material hardening caused by dew condensation, and an adsorption dryer is used for deep water removal.
3. Cleaning and maintenance of process equipment
During the production interval, compressed air needs to be used to purge and clean the equipment. Pulse-back blowing technology is adopted, and compressed air is intermittently injected at a pressure of 0.6MPa through a solenoid valve set to remove residues on the inner walls of reaction kettles, filters and other equipment. This process requires the oil content in the air to be ≤0.01mg/m³ to prevent oil pollution from polluting subsequent batches of products.
4. Automated control execution
In the DCS distributed control system, compressed air drives actuators such as pneumatic diaphragm regulating valves and cylinders. Precise control of fermentation tank temperature, pH value and other parameters is achieved through proportional valves, and the response time is ≤0.5 seconds, ensuring that the fluctuation range of process parameters is controlled within ±0.2%, ensuring the stability of product quality.
5. Auxiliary applications in packaging
During the finished product filling stage, compressed air is used for pre-purging of bottles and inflatable packaging of bagged products. The gas flow is controlled by the regulating valve to form a positive pressure environment of 0.2-0.3MPa in the packaging container, effectively blocking the intrusion of external pollutants and extending the shelf life of the product.
In summary, the compressed air system has become an indispensable public engineering facility for modern HVP powder production by providing clean power sources, achieving precise process control, and ensuring the cleanliness of the production environment. Enterprises need to establish a compressed air quality monitoring system and equip online dew point meters, laser particle counters and other testing equipment to ensure that the air supply quality complies with ISO 8573-1 Class 2 standards, thereby ensuring food safety and production continuity.
