Abstract

The electrospray device comprises a sprayer comprising a sprayer body and nozzle, and a partition positioned vertically and coaxially with the sprayer. The sprayer body is provided with a swirl generator for generating a swirling air stream, and a power supply connected between the nozzle and the partition, to apply voltage to the nozzle and the partition. The electrospray device may be part of a fluidized bed apparatus comprising a product container, a lower plenum base, an air distribution plate resided therebetween. When the power supply applies voltage in opposite polarities to the nozzle and the partition, the fluidized bed apparatus is used for coating particles; and when the power supply applies voltage of the same, the fluidized bed apparatus is used for spray-drying a solution. The electrospray device uses an electromagnetic hydrodynamic method to improve the performance of the fluidized bed apparatus and optimize the process of product.

IPC Classes  ?

• B01J 8/24 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles according to "fluidised-bed" technique
• B05B 5/053 - Arrangements for supplying power, e.g. charging power
• B01J 2/16 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
• B05B 5/03 - Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas
• B01D 1/18 - Evaporating by spraying to obtain dry solids
• B01D 1/20 - Sprayers
• B01J 2/04 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
• B05B 7/10 - Spray pistolsApparatus for discharge producing a swirling discharge
• B01J 8/42 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed subjected to electric current or to radiations
• B01J 8/18 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles
• B01D 1/30 - Accessories for evaporators

Abstract

The present invention relates to a fluidized bed apparatus and a method for particle-coating or granulating, the fluidized bed apparatus includes a swirl generator which is mounted on a sprayer body in the fluidized bed apparatus and extends throughout an air distribution plate and is connected to a source of compressed air. The swirl generator comprises a tubular sleeve extending circumferentially around the sprayer body, and an air chamber is defined between the sleeve and the sprayer body, wherein the sleeve comprises a plurality of guiding slots. The air from the source of compressed air via the air chamber is directed by said guiding slots to rotate outwardly, so as to provide a swirling air stream circumferentially outwardly relative to the sprayer. The present invention can facilitate the development of the spray pattern and the particle flow pattern and allows the particles to spin respectively due to slight friction with the inner wall of the partition, thereby opportunities for the particles to obtain a more uniform spray when subsequently passing through the spray zone above the nozzle are increased, so that performance of the fluidized bed apparatus is improved.

IPC Classes  ?

• B01J 2/16 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
• B05D 1/02 - Processes for applying liquids or other fluent materials performed by spraying
• B01J 2/00 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic
• B01F 13/02 - Mixers with gas agitation, e.g. with air supply tubes
• B01J 8/24 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles according to "fluidised-bed" technique
• B05B 1/34 - Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
• F26B 3/092 - Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed agitating the fluidised bed, e.g. by vibrating or pulsating

Abstract

Disclosed are an electrospray device (1) for a fluidized-bed apparatus (10), the fluidized-bed apparatus (10), and a fluidized-bed method. The electrospray device (1) comprises a spray gun (60) and a guide cylinder (50) coaxially and vertically positioned with the spray gun (60), wherein the spray gun (60) comprises a spray gun body (62), the top of the spray gun (60) is provided with a nozzle (61), the spray gun body (62) is provided with a cyclone generator (70) for generating a cyclone, and a power source (100) is directly or indirectly connected between the nozzle (61) and the guide cylinder (50) so as to apply voltages to the nozzle (61) and the guide cylinder (50). The fluidized-bed apparatus (10) comprises a product container (20), an inflation base (30) located at a lower portion, an air distribution plate (40) arranged between the product container (20) and the inflation base (30), and the electrospray device (1). When the power source (100) applies voltages of opposite polarities to the nozzle (61) and the guide cylinder (50), the fluidized-bed apparatus (10) is used for coating particles; and when the power source (100) applies voltages of the same polarity to the nozzle (61) and the guide cylinder (50), the fluidized-bed apparatus (10) is used for spray-drying a solution. The electrospray device (1) uses an electromagnetic hydrodynamics method to improve the performance of the fluidized-bed apparatus (10) and optimize the process of products.

IPC Classes  ?

• B01J 2/16 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
• B05B 5/025 - Discharge apparatus, e.g. electrostatic spray guns
• F26B 3/06 - Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried

Abstract

A fluidized bed device (10) and method for coating particles or granulation. The fluidized bed device (10) comprises a vortex generator (70), and the vortex generator (70) is mounted on a spray nozzle body (62) of the fluidized bed device (10), and passes through an air distributor (40) to be connected to a compressed air source. The vortex generator (70) is provided with a tubular sleeve (71) extending around and surrounding the spray nozzle body (62). An air chamber (74) is defined between the sleeve (71) and the spray nozzle body (62), and the sleeve (71) is provided with multiple guide channel openings (79). Air from the compressed air source passes through the guide channel openings (79) via the air chamber (74) and is guided to spin outward, to provide, in a guided flow cylinder (50) of the fluidized bed device (10), an outward vortex airflow in a circumferential direction with respect to the spray nozzle (60). The device optimizes flow characteristics of a spray pattern and a particle flow pattern in a spray region, thus improving the performance of a fluidized bed.

IPC Classes  ?

• B01J 2/16 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain

Abstract

A fluidized bed device (10) and method for coating particles or granulation. The fluidized bed device (10) comprises a vortex generator (70), and the vortex generator (70) is mounted on a spray nozzle body (62) of the fluidized bed device (10), and passes through an air distributor (40) to be connected to a compressed air source. The vortex generator (70) is provided with a tubular sleeve (71) extending around and surrounding the spray nozzle body (62). An air chamber (74) is defined between the sleeve (71) and the spray nozzle body (62), and the sleeve (71) is provided with multiple guide channel openings (79). Air from the compressed air source passes through the guide channel openings (79) via the air chamber (74) and is guided to spin outward, to provide, in a guided flow cylinder (50) of the fluidized bed device (10), an outward vortex airflow in a circumferential direction with respect to the spray nozzle (60). The device optimizes flow characteristics of a spray pattern and a particle flow pattern in a spray region, thus improving the performance of a fluidized bed.

IPC Classes  ?

• B01J 2/16 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain