How does the steam system exclude non-condensable gases such as air?

How does the steam system exclude non-condensable gases such as air?

The presence of air in the steam system creates certain hazards. The air is a poor conductor of heat. In fact, the thermal resistance of air is more than 1500 times that of iron and steel , and it is 13,000 times that of copper .

The presence of air creates a thermal resistance that affects heat transfer, reduces heat exchanger output, and increases heating time. Due to the poor thermal conductivity of the air, the presence of air film on the heat exchange surface will cause a cold point . The presence of air will cause the product to heat unevenly. The temperature of the steam cannot be determined according to the pressure gauge, which is unacceptable for many processes.

If 20% of the air in the heating space is present, it will bring down the steam temperature above 10 °C. In order to meet the steam temperature demand, the steam pressure requirement will be increased. Due to the insufficient emptying performance of the trap itself, sometimes the presence of air creates a severe steam lock on the hydrophobic system. Air entering the condensate system causes the water hammer.

Oxygen, carbon dioxide, etc. contained in the air are also prone to corrosion of valve parts, heat exchangers, etc.

The source of air in the steam system is derived from the steam system. close Take Rear Production Health true Empty , suck Enter air Gas; another pot furnace give water carry band air Gas and Supplement give water with cold Condensate water Connect touch air gas It is also a source. There is also a feeding space for intermittent heating equipment and Cold air carried by materials and equipment when heated directly.

The Watt BW thermostatic air venting valve contains a liquid-filled sealing bladder whose boiling point is slightly lower than the steam saturation temperature, so when pure steam surrounds the sealing bladder, the internal liquid evaporates its pressure to close the valve ; when there is steam When the air is lower than pure steam , the valve automatically opens to release air. The valve closes when the surrounding is pure steam .

The Watt BW Thermostatic Exhaust Valve automatically removes air at all times during the entire operation of the steam system. The use of a BW exhaust valve improves heat transfer, saves energy and increases productivity. At the same time, the air is removed in time, and the process of temperature control is critical to maintain the performance of the process, so that the heating is uniform and the product quality is improved. Reduce corrosion and maintenance costs. Speed ​​up system start-up and minimize start-up consumption It is essential for the evacuation of large space steam heating systems.

The steam system exhaust valve is preferably installed at the end of the pipe, the dead angle of the equipment, or the retentate area of ​​the heat exchange equipment, which is advantageous for the accumulation and elimination of non-condensable gases. A manual ball valve should be installed before the thermostatic venting valve so that the exhaust valve does not stop during maintenance. When the steam system is shut down, the exhaust valve is open. If the air flow is isolated from the outside when the machine is stopped, a small pressure drop soft seal check valve can be installed in front of the exhaust valve.

   

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