RU83600U1 - DEVICE FOR CHAMBER DRYING OF MOISTURE-CONTAINING MATERIALS - Google Patents

Abstract

A device for chamber drying of moisture-containing materials, comprising a compressor, a heater, a separator and a control valve connected in series, characterized in that the device further comprises a heat exchanger installed between the separator and the compressor, and the control valve is located at the inlet of the heat exchanger.

Description

The utility model relates to the field of chamber drying of moisture-containing materials and can be used in sawmill, woodworking industry or other areas where chamber drying of materials is carried out. Chamber drying of lumber is carried out mainly with the help of steam - air drying chambers. The drying technology provides for toughening of the drying agent (increase in temperature and decrease in humidity of the air washing the pile of lumber) while reducing the humidity of the wood. In this case, it is necessary to stabilize the parameters of the drying agent (moist air) - temperature and humidity. To heat the drying agent, a calorifer equipment is installed in the chamber, which changes the thermal power, depending on the required and actual temperature of the drying agent. The humidity of the drying agent is regulated by replacing the moist air in the chamber with drier air coming from the street or utility room (workshop). Exhausted moist air is discharged into the street. As you know, about 2500 kJ / kg (latent heat of vaporization) of energy is spent on moisture evaporation. This, energy is lost with the release of air into the atmosphere. To reduce energy loss, on chambers of large volume, recuperators are installed in which cooling occurs

discharged from the chamber air and heated incoming. However, the efficiency of such systems cannot be high. In winter, almost dry street air, having a low heat capacity, cannot utilize the completely "waste energy" of moist air. In the summer, the recuperator becomes almost useless, because it does not condense moisture from the exhaust air.

A device for chamber drying of moisture-containing materials, based on the fact that moist air is not emitted into the atmosphere, but is sucked in by the compressor, is compressed by heating and enters the air heater installed in the drying space of the chamber / 1 /. Moisture condensation occurs in the heater blown by the drying agent, and the thermal energy released in this case is transferred to the drying agent, increasing its temperature. The disadvantage of this solution is that the dried air under pressure enters the drying space of the chamber and expands to atmospheric pressure. However, the process of pressure reduction is accompanied by a decrease in temperature, which negatively affects the temperature of the drying agent, thereby reducing the efficiency of the device.

The purpose of the utility model is to increase the efficiency of recovery of thermal energy spent on the evaporation of moisture.

The solution to this problem is provided by the fact that the device for chamber drying of moisture-containing materials, including a series-connected compressor, air heater, separator, and a control valve, further comprises a heat exchanger installed between the separator and the compressor, and the control valve is located at the inlet to the heat exchanger.

The claimed utility model can be implemented as follows. As mentioned above, the drying of lumber is carried out in a vapor-air environment. A diagram of the dehumidification of air and heat recovery is shown in figure 1. The device consists of a heat exchanger 1, compressor 2, air heater 3, separator 4 and control valve 5.

The device operates as follows. Wet air from the drying space of the chamber, passing through the heat exchanger 1, enters the compressor 2. Compressed air is directed to the inlet of the heat exchanger (air heater) 3. As a result of blowing the heat exchanger with a circulating agent, the temperature at the outlet of it decreases. As a result of the fact that the pressure at the outlet of the heat exchanger becomes higher than saturation at a given temperature, most of the moisture contained in the agent condenses, returning the energy expended on evaporation to the drying agent. Coming out of the heater 3, the mixture consists of practically dry air and water. This mixture enters the separator 4, where it is separated into dried air and water discharged to the outside. The pressure generated by the compressor is controlled by a valve (control valve) 5 installed at the inlet of the heat exchanger 1. Expanding in the heat exchanger, the dried air is cooled and cools the moist air entering the compressor. During cooling, the saturation of humid air increases, which additionally increases the amount of moisture taken by the compressor.

Thus, the proposed solution allows to increase the efficiency of the device for chamber drying of moisture-containing materials.

Information sources

1. RF patent No. 2206840, Cl. F26B 3/02, 2001

Claims (1)

A device for chamber drying of moisture-containing materials, comprising a compressor, a heater, a separator and a control valve connected in series, characterized in that the device further comprises a heat exchanger installed between the separator and the compressor, and the control valve is located at the inlet of the heat exchanger.