Air is taken out from a drying oven 1 for drying a coating film of a work piece 2, and the air is cooled such that each of at least part of moisture and at least part of a VOC which are contained in the air is condensed to be removed from the air. The air after the cooling is heated, and is returned into the drying oven 1. A heat pump 3 whose heat absorption source is the air taken out from the drying oven 1 and whose heat radiation source is the air after the cooling is provided. By using the heat pump 3, cooling and heating of the air are performed.

A grain dryer having a mixed-flow heating section, a tempering transition section, and a vacuum-cooled crossflow cooling section. A fan positioned on the end of the dryer creates a negative pressure in the cooling plenum that pulls air through the grain, warming the air while cooling the grain. This warmed air is pulled through the fan and then passed through a heater to bring it to appropriate drying temperature. This air is then pushed into a heating plenum, where it passes through a mixed-flow grain column, drying the grain, and then exhausted to ambient air.

A vehicle air dryer for removing water from a vehicle as the vehicle emerges from a car wash includes a plenum, a source of pressurized air, a slot nozzle, and a screen. The plenum extends a length, has an annular wall, and defines an interior cavity to hold air. The plenum also defines inlet and outlet ports communicating with the interior cavity. The source of pressurized air is in fluid communication with the inlet port of the plenum. The slot nozzle has an outlet in fluid communication with the outlet port, an inlet spaced from the outlet and in fluid communication with the interior cavity, and an interior passageway extending between the outlet and the inlet. The screen can be disposed between the inlet of the slot nozzle and the interior cavity.

An ash-collecting and exhaust device for a grain dryer has a body, a fan unit, and a driving unit. The body is a hollow barrel, and has an air inlet, an air outlet, and an internal surface being divergent adjacent to the air inlet. The fan unit is rotatably mounted in the body to enable external air to flow into the body via the air inlet and flow out of the body via the air outlet, and has an external surface being obliquely divergent to form an oblique passage between the body and the fan unit. The driving unit is securely mounted on the body, is connected to the fan unit to enable the fan unit to rotate relative to the body to guide the external air flowing into the body.

An electrostatic spray dryer for drying liquid into powder including an elongated cylindrical drying chamber having an electrostatic spray nozzle at an upper end and a powder collection vessel at a lower end. The powder collection vessel includes a removable and replaceable filter collections sock made of filter material for receiving and collecting dried powder from the drying chamber. For cleaning residual powder from an inside wall of the drying chamber, a scraper member is provided that is coupled by magnetic attraction to a manually removable driver on the external surface of the wall.

An electrostatic spray dryer for drying liquid into powder including an elongated cylindrical drying chamber having an electrostatic spray nozzle at an upper end and a powder collection vessel at a lower end. The powder collection vessel includes a removable and replaceable filter collections sock made of filter material for receiving and collecting dried powder from the drying chamber. For cleaning residual powder from an inside wall of the drying chamber, a scraper member is provided that is coupled by magnetic attraction to a manually removable driver on the external surface of the wall.

A method and an apparatus for preparing aerogel by drying under reduced pressure. The gel to be dried is placed into a sealed drying apparatus which can be depressurized by air extraction or/and can be heated to raise the temperature. The methods of reducing pressure by air extraction or/and raising temperature are acted upon the water and solvents within the aerogel to be dried, and an outward force is thus generated for the water and solvents to be volatilized outwards. By controlling the rates of reducing pressure by air extraction or/and raising temperature, the outward force is allowed to be equal to or close to the inward capillary force, such that the pores of the gel may not be collapsed or cracked. At the same time, drying is carried out continuously, and finally the interior water and solvents are removed completely.

A method and an apparatus for preparing aerogel by drying under reduced pressure. The gel to be dried is placed into a sealed drying apparatus which can be depressurized by air extraction or/and can be heated to raise the temperature. The methods of reducing pressure by air extraction or/and raising temperature are acted upon the water and solvents within the aerogel to be dried, and an outward force is thus generated for the water and solvents to be volatilized outwards. By controlling the rates of reducing pressure by air extraction or/and raising temperature, the outward force is allowed to be equal to or close to the inward capillary force, such that the pores of the gel may not be collapsed or cracked. At the same time, drying is carried out continuously, and finally the interior water and solvents are removed completely.

An installation for drying a non-woven web includes a device (10, 11), a diffusion chamber (10) having an outlet fitting (21) in which there is mounted a perforated sheet (24) creating a drop in pressure.

An installation for drying a non-woven web includes a device (10, 11), a diffusion chamber (10) having an outlet fitting (21) in which there is mounted a perforated sheet (24) creating a drop in pressure.