Application of KINKAI heat pump dryer in drying wood

Fresh wood contains a large amount of water and in some cases will continuously evaporate. The natural evaporation of moisture can cause defects such as shrinkage, cracking, bending deformation, and mold, which seriously affects the quality of wood products. Therefore, before the wood is made into various types of wood products, it must be forced (controlled) to dry. Correct drying treatment can overcome the defects of the above-mentioned wood, improve the mechanical strength of the wood, and improve the processing performance of the wood. The rational use of wood to increase the value of wood is an important technical measure. This is also the main process necessary for the production of wood products.

KINKAI heat pump wood drying process:

To achieve the forced drying of wood, wood drying equipment must have three basic functions: heating, moisture resistance and ventilation. Moisture control (spray steam or atomized water) is used to ensure the high humidity environment required for certain drying stages to prevent wood from cracking, deforming, etc. Ventilation equipment must ensure that hot and humid air passes evenly through the various parts of the wood stack to even out the moisture in the dry wood. Simple wood “ovens” are directly or indirectly heated by hot stove gas, it is difficult to organize reasonable air circulation, and humidity is difficult to adjust or cannot be adjusted. It is very difficult to obtain good drying results with this simple equipment.

One of the characteristics of heat pump drying firewood is that in the early stage of firewood drying, due to the high relative humidity of the drying medium, the coefficient of performance COP of the heat pump unit is high. But as the drying process progresses. The relative humidity of the drying medium decreases, and the coefficient of performance COP of the heat pump unit decreases accordingly, which will affect the performance of the unit. Secondly, if the heating temperature level is not high, such as a low temperature heat pump below 54 ° C (household equipment usually does not exceed 54 ° C), water cannot be effectively removed from the wood when the moisture content of the wood is below 15%. In general, the drying temperature needs to be raised above 71 ° C. There are certain requirements for the thermal insulation performance and air tightness of the drying room. The requirement of moisturizing performance is that the heat capacity of the chamber should be small to reduce thermal inertia. The heat loss should be equal to or less than the equivalent operating heat of the compressor. Since the heat pump drying chamber is usually not equipped with a humidifier, the air tightness is better. The escape of water vapor in the room will inevitably make it difficult to adjust the drying conditions. Fourth, the indoor airflow must be uniform and the wind speed is about 1m / s. The heat loss should be equal to or less than the equivalent operating heat of the compressor. Since the heat pump drying chamber is usually not equipped with a humidifier, the air tightness is better. The escape of water vapor in the room will inevitably make it difficult to adjust the drying conditions. Fourth, the indoor airflow must be uniform and the wind speed is about 1m / s. The heat loss should be equal to or less than the equivalent operating heat of the compressor. Since the heat pump drying chamber is usually not equipped with a humidifier, the air tightness is better. The escape of water vapor in the room will inevitably make it difficult to adjust the drying conditions. Fourth, the indoor airflow must be uniform and the wind speed is about 1m / s.

KINKAI heat pump dryer can meet the above requirements

Working guidelines:

The heat pump dryer uses the reverse Carnot principle to absorb the heat in the air and transfer it to the room to increase the temperature of the drying room, and cooperate with the corresponding equipment to dry the material. The heat pump dryer is composed of compressor-heat exchanger (internal machine) -throttle-radiator (external machine) -compressor and other equipment forming the circulation system (host + drying room). The refrigerant is circulated in the system by the compressor. It completes the gaseous boosting and heating process in the compressor (temperature up to 115 ° C). It enters the internal machine and releases high-temperature heat to heat the air in the drying chamber. At the same time, it is cooled and converted into a liquid. After that, the liquid quickly absorbs heat and then evaporates again to become gaseous. At the same time, the temperature dropped to minus 20 ° C to 30 ° C. At this time, the air around the radiator will continuously transfer heat to the refrigerant. The refrigerant is continuously circulated to transfer the heat in the air to the drying chamber to increase the air temperature in the room.

Contact
Wanda guo
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