Thermal Oil Heating System In Plywood and Wood Based Panel Industry

In the wood based panel industry, thermocompressor is they key equipment which used to produce plywood, medium density fibre board, chip board and so on. The thermocompressor normally direct heated by electricity and heat carrier fluid (steam, water or thermal oil) During the process, the wood panel surface is contact with thermocompressor and rise to a very high temperature, waters in the wood panel become steam, there will be a temperature between the panel surface and the inside. Heated steam and water carries the thermal energy to heat the panel inside. This heating system is composed of wood, air and water, the heat transfer property is actually poor. It takes time to heat the panel inside to reach the desired temperature. This method is not suitable for thick panel product. There are some requirement of the heating medium for direct heating 1. Large heat capacity, good heat conduction performance. Good thermostability, nonflammableNon toxic, odorless, non-corrosivenessLow cost Compare of steam and super heated water, thermal oil is the most ideal fluid to be used in wood base panel industry. Especially for plywood, chip wood and fibre wood product. Why? 1. Steam The temperature of saturated steam is depends on the pressure. The higher temperature requires higher pressure. For example, if operator want the steam to be 200?, the pressure is 1.6 Mpa, if 220?, the pressure will be 2.3Mpa. After heated the plywood, steam temperature decreased and steam become condensate water, condensate water will effect the steam circulation and effect the steam heating capacity. When use steam boiler to make plywood product, you must discharge the condensate water in time. Or else it will effect the whole production process. Disadvantages: 1. The max temperature is around 200?, the steam pressure is around 1.6Mpa. The steam boiler pressure is at least 2.5Mpa. Customer will have to invest a lot of money for the boiler and pipeline connection. 2. There are great energy wasted during the process of heating the water to 100?.after the steam become condensate water, there are also thermal energy remains in the water but can not be used. Because the water will be discharged directly. 3. The thermal energy loss during the circulation is large! And the steam is hardly to be recycled. The overall energy utilizationis only 30~40%. 4. Steam flows too fast during the process (20~30m/s), it is hard to keep the temperature stable during the process. url:http://www.slboilers.com