- Heated adsorption dryers use thermal energy to desorb moisture from the adsorbent. This thermal energy is increased by the heater consuming energy to reach the complete desorption temperature. If the plant's waste heat from outside the adsorption dryer can be used to preheat the regeneration airflow, the temperature rise value of the heater can be reduced, which in turn can reduce the energy consumption of the heater.
- There are various forms of plant waste heat, and the higher the preheating temperature, the better the effect. However, it is even more necessary to prevent the occurrence of moisture contamination. Good outlet quality and stable equipment operation are the top priorities, and energy saving can only be discussed if there are no concerns as mentioned above.
Plant waste heat utilization:
- Air compressor compression waste heat utilization:
Directly introducing the hot air from the final stage of compression before cooling into the adsorption tower for desorption and regeneration often leads to direct contamination of the adsorbent by moisture and oil vapor.
In addition, there are cases where incomplete desorption occurs due to insufficient temperature.
If a heat exchange method is used to obtain the waste heat from the final stage of air compressor compression (approximately 80 ~ 150℃), and then a heater is used to supplement the heat to reach the optimal desorption temperature, the moisture and oil vapor in the waste heat will not directly contact the adsorbent due to the heat exchange. Using the CDA from the dryer outlet for the entire regeneration process can avoid unnecessary contamination problems. - Steam waste heat utilization
- Cooling system waste heat utilization
- Other waste heat utilization
In summary, if the heated regeneration airflow can effectively utilize plant waste heat for preheating, the energy consumption (temperature difference value) of the heater will definitely be reduced, and the energy-saving effect will be immediately apparent.
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