Abstract: The present invention relates to an air purification device. The housing includes a main passage section through which air is introduced from a room through a main inlet port and is discharged to an outside through a main outlet port, and a bypass passage section partitioned from the main passage section, through which air is introduced from the room through a bypass inlet port and is discharged to an outside through a bypass outlet port. The main inlet port damper opens and closes the main inlet port. The main outlet port damper opens and closes the main outlet port. The bypass damper opens and closes the bypass passage section. The controller is configured to control the bypass damper so as to open the bypass passage section when the main passage section is closed due to a malfunction of the main inlet port damper or the main outlet port damper.

Abstract: According to an embodiment of the present application, there may be provided an air purification apparatus for purifying polluted air and discharging the purified air, which comprises a main pipe including a first flow path, a second flow path, a first filter, a first main area, and a second main area. The air purification apparatus can operate in a filtering mode in which at least some contaminants contained in the air flowing into the main pipe are collected by the first filter, or a cleaning mode in which at least some of the contaminants collected by the first filter in the filtering mode are removed, wherein an operation section in the cleaning mode of the air purification apparatus includes a firs section and a second section, the first section and the second section are divided on the basis of a first division time point, and the rate of change of temperature in the first main area is varied before and after the first division time point.

Abstract: The present invention relates to an air purification device. The housing includes a main passage section through which air is introduced from a room through a main inlet port and is discharged to an outside through a main outlet port, and a bypass passage section partitioned from the main passage section, through which air is introduced from the room through a bypass inlet port and is discharged to an outside through a bypass outlet port. The main inlet port damper opens and closes the main inlet port. The main outlet port damper opens and closes the main outlet port. The bypass damper opens and closes the bypass passage section. The controller is configured to control the bypass damper so as to open the bypass passage section when the main passage section is closed due to a malfunction of the main inlet port damper or the main outlet port damper.

Abstract: An air cleaning device is disclosed. A first opening and closing member opens and closes an inlet of a housing. A second opening and closing member opens and closes an outlet of the housing. A first filter unit collects and separates foreign substances from contaminated air in the housing. A circulation tube has a first end portion disposed at the inlet to communicate with the housing and a second end portion disposed at the outlet to communicate with the housing. A third opening and closing member opens and closes the circulation tube. A first heater is installed inside the circulation tube to heat air in the circulation tube. A blower is installed inside the circulation tube to deliver air from the circulation tube into the housing.

Abstract: An air cleaning device is disclosed. A first opening and closing member opens and closes an inlet of a housing. A second opening and closing member opens and closes an outlet of the housing. A first filter unit collects and separates foreign substances from contaminated air in the housing A circulation tube has a first end portion disposed at the inlet to communicate with the housing and a second end portion disposed at the outlet to communicate with the housing. A third opening and closing member opens and closes the circulation tube. A first heater is installed inside the circulation tube to heat air in the circulation tube. A blower is installed inside the circulation tube to deliver air from the circulation tube into the housing.

Abstract: In an air purifying apparatus for removing contaminants, such as soot and the like, by burning contaminated air while passing the contaminated air through a filter heated by microwaves, the apparatus includes: a housing, which is hollow, and comprises an inlet on one side and an outlet on the other side; a ceramic filter of a longitudinal material, which is arranged in the housing in a longitudinal direction of the housing, and includes a plurality of partition walls formed so that a flow path where contaminated air flows may be divided in plurality; and a microwave generator configured to generate microwaves to be supplied to one end surface of the ceramic filter in a longitudinal direction thereof to heat the one end surface of the ceramic filter in the longitudinal direction.

Abstract: In an air purifying apparatus for removing contaminants, such as soot and the like, by burning contaminated air while passing the contaminated air through a filter heated by microwaves, the apparatus includes: a housing, which is hollow, and comprises an inlet on one side and an outlet on the other side; a ceramic filter of a longitudinal material, which is arranged in the housing in a longitudinal direction of the housing, and includes a plurality of partition walls formed so that a flow path where contaminated air flows may be divided in plurality; and a microwave generator configured to generate microwaves to be supplied to one end surface of the ceramic filter in a longitudinal direction thereof to heat the one end surface of the ceramic filter in the longitudinal direction.

Abstract: An apparatus for collecting soluble component-removed powder that collects soluble component-removed and poorly soluble component-containing powder to recycle by removing the soluble component from the powder through filtering using a vacuum pump after mixing soluble component-removed and poorly soluble component-containing powder and a solvent dissolving the soluble component, and a method of the same.

Abstract: Disclosed herein is a method for preparing a silicon carbide segment for a honeycomb ceramic filter as a diesel particulate filter (DPF) by conducting drying, perforating, plugging, and sintering processes for an extruded body cut into a segment having a predetermined size, wherein a sealant, which will melt and adhere to corners of cells in the sintering process, to seal the cell corners, is applied to partition walls of the segment at opposite ends of the segment in the plugging process.

Abstract: A ceramic filter and method for preparing the same. The method for preparing the ceramic filter according to the present invention is characterized in comprising the steps of: (a) coating firstly a ceramic green paper prepared by using a slurry solution comprising ceramic fiber of 0.1-10 mm length, with an aluminum silicate solution and drying the firstly coated paper; (b) coating secondly the dried ceramic green paper with an aluminum phosphate solution and drying the secondly coated paper; and (c) calcining the dried ceramic green paper obtained from the step (b). The ceramic filter according to the present invention has excellent mechanical strength since the bonding strength between ceramic fibers is very high, and shows good porosity, gas permeability, and efficiency for capturing microparticles since the pores between the ceramic fibers are less blocked, and thus can be very usefully applied to gas exhaustion system for automobile.

Abstract: The present invention relates to a method for preparing single crystalline cerium oxide nanopowder capable of easily controlling the shape and granularity of particles. The method includes preparing cerium hydroxide by precipitating a cerium salt in the presence of a solvent mixture of organic solvent and water and hydrothermally reacting the prepared cerium hydroxide. The prepared single crystalline cerium oxide has a particle size of not less than about 30 nm and an excellent degree of dispersion.

Abstract: The present invention relates to a preparation method of ?-alumina nano powder, and more particularly to a preparation method of ?-alumina nano powder that has a uniform particle shape and size distribution, is capable of being produced at a low temperature, and contains less than 20 ppm of alkali metals such as Na and K. the ?-alumina nano powder is prepared by glycolating aluminium alkoxide in glycol solution containing the ?-iron oxide or ?-alumina nucleation seed and carrying out glyco thermal reaction.

Abstract: The present invention relates to a preparation method of ?-alumina nano powder, and more particularly to a preparation method of ?-alumina nano powder that has a uniform particle shape and size distribution, is capable of being produced at a low temperature, and contains less than 20 ppm of alkali metals such as Na and K. the ?-alumina nano powder is prepared by glycolating aluminium alkoxide in glycol solution containing the ?-iron oxide or ?-alumina nucleation seed and carrying out glyco thermal reaction.

Abstract: The present Invention relates to a method for preparing single crystalline cerium oxide nanopowder capable of easily controlling the shape and granularity of particles. The method includes preparing cerium hydroxide by precipitating a cerium salt in the presence of a solvent mixture of organic solvent and water and hydrothermally reacting the prepared cerium hydroxide. The prepared single crystalline cerium oxide has a particle size of not less than about 30 nm and an excellent degree of dispersion.