Heat pump dryers

KENKI DRYER which is a self-heat recuperation dryer with steam (saturated steam) heat pump is a self-heat recuperation drying system using steam as its heat source.
During steam heat pump process, pressure of steam used in heat drying at KENKI DRYER is decreased because of adiabatic expansion at expansion valve and temperature of the steam is lowered since the steam absorbs heat around it when moisture contents in the steam evaporates. By transferring heat of steam with heat exchangers at the next process, the steam is evaporated more thoroughly and steam pressure is also decreased more. After steam is evaporated and its pressure is lowered enough, it moves to next process which is compression. At compression process, steam is adiabatically compressed by compressors and it is condensed, turns to liquid and its temperature rises as its pressure is increased.After removing moisture contents of steam, the steam is fed into KENKI DRYER. By using the steam as heat source and transferring heat at heat drying process, steam is additionally condensed and turns to liquid, then moves to expansion valve. These processes are repeated.
Even for KENKI DRYER of a self-heat recuperation dryer with heat pump, steam (saturated steam) need to be supplied from outside when the dryer starts running. However, after once steam which have pressure required for the heat drying is supplied, used steam from heat drying in KENKI DRYER is re-used as heat source by expanding steam, transferring heat, compressing, and heat transferring at KENKI DRYER. Supplied steam from outside can be reduced drastically by changing from all heat supplied drying with conventional boilers to heat pump type drying, and fuel cost and emission of carbon dioxide which is one of greenhouse gases can be reduced drastically. It can save energy and also contribute to global environment.
Even in a self-heat recuperation system with heat pump, drying heat efficiency does not change in KENKI DRYER compared with conventional steam suppling with boilers, and it can dry any adhesive materials, sticky materials, sludge, slurry, liquid and wastes materials containing high moisture contents that no other dryers can deal with.

Steam used in KENKI DRYER, which is a self-heat recuperation dryer, is used repeatedly in adiabatic expansion, heat transition, adiabatic compression, and heat transfer within KENKI DRYER, therefore, amount of required steam generated in boiler using fossil fuels such as oils, gases etc. is drastically reduced. As the result, fuel cost can be significantly reduced compering with using only the steam generated by conventional boiler for drying.
A device which consumes power the most in heat pump is compressor and shaft power of compressor is electricity. It means energy required to generate steam as a heat source of KENKI DRYER, which is a self-heat recuperation dryer, is switched from fossil fuels to electricity, however, cost for generating steam which affects running cost is reduced. Also, carbon dioxide emission factor used in calculation of emitted amount of carbon dioxide, which is a potent greenhouse gas, is significantly low in using electricity compering with fossil fuels, so amount of carbon dioxide emission can be drastically reduced by using this heat pump type KENKI DRYER.
By using KENKI DRYER, which is a self-heat recuperation dryer, for drying materials having high adhesiveness, high stickiness and high moisture contents that any other dryer can handle, energy can be saved, amount of wastes and carbon dioxide which is potent greenhouse gas can be significantly reduced, and environmental load for the earth can be drastically declined.

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