What are the features of a heat pump sludge dryer?

What are the features of a heat pump sludge dryer?

Heat pump is essentially a heat lifting device, high temperature heat pump sludge dryer unit utilizes the inverse Carnot principle to draw heat from the surrounding environment and transfer it to the object to be heated (object with higher temperature).

The traditional heat pump sludge dryer is basically open-loop drying, but at present, with the concern of drying quality, the closed-loop dehumidification heat pump sludge dryer has become a new trend and hot spot because of its low energy consumption, high quality, and many other points, and gradually replace the traditional open-loop heat pump dryer.

Features of heat pump sludge dryer:

1、It can realize low-temperature air closed cycle drying, and the material drying quality is good. By controlling the working condition of the device, the temperature of the hot dry air in the drying room is between 20～80℃, which can meet the high quality drying requirements of most of the heat-sensitive materials; the closed circulation of the drying medium can avoid the impurity pollution that may be brought to the materials by exchanging with the external gas.

In addition, when the material is sensitive to the oxygen in the air (easy to oxidize or burn and explode), inert medium can also be used instead of air as the drying medium to realize oxygen-free drying.

2, high efficiency and energy saving. Heat pump sludge dryer in the heat of the heated air mainly from the recovery of the drying room discharged warm and wet air contained in the sensible and latent heat, the energy input is only the heat pump compressor power consumption, and the heat pump has a small amount of power consumption can be a large number of advantages of the heat, so the heat pump drying device SMER (consume a unit of energy in the removal of wet materials in the moisture content) is usually 1.0 to 4.0kg/kWh, while the traditional convection dryer SMER (consumption unit energy removed from wet materials in the moisture), and The SMER value of traditional convection dryer is about 0.2～0.6kg/kWh.

3, temperature, humidity regulation and control is convenient. When the materials have high requirements on the temperature and humidity of the air in the drying room (such as wood, etc.), the evaporation temperature and condensation temperature of the work material in the evaporator and condenser can be adjusted to meet the requirements of the materials on the quality structure and appearance.

4, can recover the useful volatile components in the material. Some materials contain volatile components (such as fragrance and other volatile components), the use of heat pump drying, in the drying chamber, volatile components and water together with the gasification into the air, containing volatile components of the air through the evaporator is cooled, the volatile components of which are also liquefied, with the condensate together with the discharge, the collection of volatile components of the condensate, and the appropriate method of the volatile components can be separated from the useful. The condensate containing volatile components is collected, and the useful volatile components are separated out by appropriate methods.

5、Environmentally friendly. Heat pump drying device in which the drying medium is closed cycle, there is no material dust, volatile substances and odor with the drying exhaust gas emissions to the environment and the pollution brought about; drying room exhaust in the residual heat is directly recovered by the heat pump to heat the cold dry air, there is no unit of thermal pollution of the environment.

6、Multi-functionality can be realized. Heat pump drying device in the heat pump also has refrigeration function, can be in the drying task less season, the use of refrigeration function to realize a variety of materials of low-temperature processing (such as quick-frozen, frozen) or preservation of freshness, but also expand the heat pump heat function in the cold season for the planting (such as greenhouses) or breeding places for heat supply.

7, the heat pump sludge dryer is suitable for a wide range of materials. Suitable for the drying of materials mainly for the drying process temperature between 20 ~ 80 ℃ a large class of materials, or although the material can withstand higher temperatures, but the use of heat pump drying more energy-saving or safe materials. Has been studied and applied more materials such as wood (such as oak), grains, seeds, edible fungi (such as mushrooms, fungus), medicinal herbs (such as ginseng, etc.), seafood (such as fresh oysters, scallops, etc.), biologically active products (such as cells, enzymes), tea, paper and so on.

8, with other low temperature (into the drying room air temperature <40 ℃) drying device (such as microwave drying, vacuum drying, freeze drying) compared to the initial investment in equipment is small, low operating costs, heat pump sludge dryer device has a clear economy. The equipment cost of heat pump drying device is mainly the heat pump part and drying room part, in which the drying room part and ordinary convection drying room requirements are the same, no special airtightness and pressure requirements.

9, compared with the ordinary drying device (into the drying room air temperature > 40 ℃), due to the heat pump sludge dryer initial investment is generally higher than the air electric heating device, gas or coal-fired hot air furnace, so the drying device of the initial investment is generally higher than the ordinary drying device, heat pump sludge dryer drying device with high energy efficiency, low operating costs, its comprehensive economic still have certain advantages.