SU1262228A1 - Spraying unit for drier - Google Patents

Abstract

The invention relates to spray drying, in particular, to a spray dryer unit that can be used in various sectors of a national household. The invention makes it possible to intensify heat and mass transfer in a spray plume by creating a high temperature of the heat transfer medium at the exit of the nozzle 9 of the chamber 8 and reducing the pressure of the initial solution. For this purpose, there is a stirring inside the chamber, two different diaphragms 12 and 13 that are not the same size, and inlet pipes 14 and 15 are placed below and above the diaphragm 12, respectively. 1 Il.

Description

The invention relates to spray drying and can be used in the chemical industry and other sectors of the economy.

The purpose of the invention is the intensification of heat and mass transfer in a spray torch.

The drawing · schematically shows a dryer with the proposed spray unit.

The dryer contains a housing 1, a nozzle 2 for introducing the coolant, a nozzle 3 for ^{0 of the} outlet of the spent coolant, and an unloading device 4. The dryer also has a spray unit that contains a feed pipe 5 with a supply pipe 6 for the initial solution and an outlet ₁₅ nozzle 7. The pipe 5 is enclosed in the chamber 8, which is also made with an output nozzle 9 located around the nozzle 7. Inside the chamber 8, between its wall and the feed pipe 5 with gaps 10 and 11 are placed diaphragm 12 and 13 and the chamber 8 20 has a supply pipe 14 and 15, respectively venno for inputting the coolant from the nozzle 2 via line 16 and air to enter the blower through line 17 from the compressor, and the ejection openings 18 for input _{2 May} coolant dust. The cross section of the gap 10 is 1.5-3 times larger than the cross section of the gap 11.

The work is as follows.

The initial solution of granular material under pressure of 5-7 kg / cm ² is fed into the feed pipe 5. Blowing air from the compressor under pressure of 2-3 kg / cm ^g enters through line 17 and the pipe 15 into chamber 8, passes through annular gaps 10 and 11 through a cascade of two consecutively located 35 diaphragms 12 and 13, behind which a coolant from line 16 is ejected into the rarefaction zone through a pipe 14 and an exhaust coolant with a substantial amount of dust carried away from the housing 1 through the openings 18.

A gas-droplet mixture is dispersed from nozzle 9 with a certain dust content of the finished product, which are additional centers of granule formation during the drying of the initial solution, at a significant torch temperature (220–230 ° С), which significantly intensifies the processes of heat and mass transfer in the spray zone.

The sprayed stock solution is dried inside the housing 1 in contact with the coolant supplied through the pipe 2.

Dried granules of the finished product falling in the lower (conical) part of the housing 1, through the unloading device 4 is removed from the dryer.

The spent coolant is discharged through the pipe 3.

Claims (3)

The invention relates to spray drying and can be used in the chemical industry and other sectors of the national economy. The purpose of the invention is the intensification of heat and mass transfer in a spray. The drawing is a schematic representation of a dryer with the proposed spray unit. The dryer includes a housing 1, a nozzle 2 for introducing a coolant, a nozzle 3 for withdrawing the spent coolant and a discharge device 4. The dryer also has a spray unit that contains a feeding pipe 5 with a supply w, it has a connecting pipe 6 for the initial solution and an outlet nozzle 7. Pipe 5 enclosed in chamber 8, which is also provided with an outlet nozzle 9 located around nozzle 7. Inside chamber 8, diaphragms 12 and 13 are placed between its wall and feeding tube 5 with gaps 10 and 11, and chamber 8 has a connection w, 14 branch pipes and 15 corresponds venno for introducing the heat medium from the nozzle 2 through line 16 and for the blower air entering via line 17 from the compressor, and the ejection openings 18 for introducing the heating medium with dust. The cross section of the gap 10 is 1.5–3 times the cross section of the gap 11. The work is dried as follows. The initial solution of the granulated material under pressure of 5-7 kg / cm is fed into the feed pipe 5. The blowing air from the compressor under pressure of 2-3 kg / cm enters through line 17 and the nozzle 15 into chamber 8, passes through the annular gaps 10 and 11 through the cascade of two consecutive diaphragms 12 and 13, behind which heat carrier from line 16 is ejected into the dilution zones through pipe 14 and exhaust heat carrier with a significant amount of dust carried away from housing 1 through openings 18. From the nozzle 9, a gas-droplet mixture is dispersed with ring content of the finished product dust is decoupling additional centers of granules during drying feed solution, at a temperature substantially torch (220- 230 ° C), which significantly intensifies the processes of heat and mass transfer in the spray zone. The sprayed initial solution is dried inside the housing 1 upon contact with the coolant supplied through the nozzle 2. The dried granules of the finished product falling into the lower (conical) part of the housing 1, through the discharge device 4, are withdrawn from the dryer. Waste heat carrier is discharged through the pipe 3. Claims of the invention A spray unit for a dryer comprising a feed tube coaxially enclosed in a chamber with feed pipes and an outlet nozzle located around the feed tube nozzle and a diaphragm placed in the chamber between its side wall and the feed tube with a gap relative to the latter, different the fact that, in order to intensify heat and mass transfer in the spray, in the side wall of the chamber under the diaphragm are made through ejection holes, and a second diaphragm is installed in the chamber above the diaphragm ma forming a gap with the feed tube with a cross section 1.5–3 times larger than the gap between the feed tube and the first diaphragm, while the inlet nozzles are connected to the chamber below and above the second diaphragm.