Steam Air Retort Machine

Steam Air Retort Autoclave Sterilizer

Item No.: HQ-001
Description Review
Description
Description:

The steam air retort provides a heat source to the sterilization retort through two steam distribution pipes installed at the bottom. No exhaust process is required. The large-flow axial flow fan installed in the sterilization retort fully mixes the cold air and steam in the retort. It is then used as a heat transfer medium to evenly heat and sterilize the canned food in the sterilizing retort. Since the fan in the retort is carefully designed, the sterilization process does not require an exhaust process. The large-flow fan can remove the air in the pot. The air bags are fully dispersed and mixed with steam as a heat transfer medium for sterilization, with uniform temperature and no cold spots. The steam mixture is forced to circulate in the sterilizing retort through the air duct. The heat in the sterilizing retort is evenly distributed, which can meet the requirements of the thermal sterilization process of canned food in various packaging types.


 Application:

Suitable for all heat resistant and waterproof package material except casing
1. Glass container: Glass bottle, glass jar
2. Metal can : Tin canned, aluminum can
3. Plastic container serial: PP bottles, HDPE bottles
4. Flexible pouch serial: flexible retort pouch, laminated film bag, high temperature  cooking bag, vacuum bag


Steam air working principle

Step 1: heating process

Start the steam and fan first. Under the action of the fan, the steam and air in the kettle flow forward and backward through the air duct.

Step 2: Sterilization Process

When the temperature reaches the set temperature, the steam valve is closed and the fan continues to run in the cycle. After the holding time is reached, the fan is turned off; the pressure in the tank is adjusted within the required ideal range through the pressure valve and exhaust valve.

Step 3: Cool down

If the amount of condensed water is insufficient, softened water can be added, and the circulation pump is turned on to circulate the condensed water through the heat exchanger for spraying. When the temperature reaches the set temperature, the cooling is completed.

Step 4: Drainage

The remaining sterilizing water is discharged through the drain valve, and the pressure in the pot is released through the exhaust valve.
Steam air retort features:

Reasonable steam expansion injection holes: In order to ensure steam circulation and prevent unfavorable steam circulation at the bottom of the product, our company adopts the design concept of steam segmented injection. All injection holes are located in the middle gap between baskets.

In order to ensure the heat distribution effect, our company uses large-flow axial flow fans.
The fan is made of 304 material, with stable structure and long service life.
Regarding the air volume and pressure of the fan, our company uses theoretical calculations to ensure the thermal distribution test results of the product, and then increases the air volume to prevent unqualified heat distribution due to different packaging forms.


Design of fan diameter, flow rate and power of axial flow fan:
The design of the fan diameter, flow rate and power of the axial flow fan is directly related to whether the cold air bag in the pot can be dispersed and the steam is fully mixed. We calculated through theory:
First, based on the weight of the product, calculate the diameter of the steam port and determine the steam flow rate and volume.
For example, for a DN50 steam pipe diameter, at a pressure of 4Bar, the flow rate is 776Kg/h. At this pressure, the steam density is approximately 2.67Kg/m³, so the volume V=290m³ is obtained.
When we select the fan flow rate, we cycle the steam volume about 100 times per hour based on the flow rate of the axial flow fan.
Calculated: 290m³X100=29000m³
The actual selected fan model is: impeller diameter 800mm, main shaft speed 1400 rpm, blade angle 20 degrees, actual air 
volume 30678m³/h, motor power 4kw.

Other advantages:
1. The steam air retort allows pressurization during the heating and heat preservation stages, so it can be used in flexible packaging;
2. The fan motor is controlled by a frequency converter, which can slowly start and stop, effectively protecting the motor, bearings and other components;
3. A proportional regulating valve can be used to control steam, which can design multi-stage temperature rises, achieve linear control, and ensure the standardization of sterilization products.

keywords: retort machine,autoclave machine,food retort, food sterilization, retort system, retort processing, industrial autoclave,canning retort machine, autoclave for canned food
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