RU93634U1 - SPRAY DRYER - Google Patents

Abstract

 A spray dryer including a drying chamber, a blower fan, an auxiliary fan, an air heater, an air distributor, a head and discharge cyclones, milk powder storage bins with cyclones and slide valves, a vibrating sieve, a pneumatic conveying line, characterized in that the pneumatic conveying line is additionally equipped with a pipeline connecting hoppers for storing milk powder with a head cyclone.

Description

Device for pneumatic conveying of powdered materials, prone to aggregation, mainly to powdered milk.

A device (1) for pneumatic transportation of milk powder from the drying chamber to the storage hopper is known. However, it has two drawbacks: the potential danger of blocking the hopper of the feeder with particles of milk powder due to two factors: aggregation of particles and their adhesion to the walls of the device.

The potential danger of a breakthrough of the air flow from the supply pipe through the receiving chamber, then the screw conveyor and the hopper feeder.

The utility model relates to technological equipment of the dairy industry and is intended for drying milk.

Known spray drying installation including a drying chamber, exhaust fan, a pipe for removing exhaust air, storage bins, dry product pneumatic conveying system, cyclone, blower fan, air heater, spray disk. ["Cleaning the drying installation" / M.Ya. Burlev; Moscow; Dairy industry, No. 6, 2009, p.50]

Also known is a spray dryer including a drying chamber, an exhaust fan, a pneumatic conveying line, an unloading cyclone, a blower fan, an air heater, a filter, a vibrating screen. [Kharitonov V.D. Two-stage drying of dairy products. - M .: Agropromizdat, 1986. - 9 p.]

The closest in technical essence and the achieved result is a spray dryer including a blower, an air cooler, a filter, a fan, a fabric filter, a hopper for intermediate storage of milk powder, a multi-position switch, a rotary feeder, an expedition hopper, a screw feeder. [NN Lipatov, Kharitonov V.D. Powdered milk. Theory and practice of production .- M.: Light and food industry, 1981. - 152 p., Fig. 91]

The disadvantage of the above analogues is the loss of milk powder through filters installed at the outlet of the exhaust air from the cyclones of the bins for collecting and storing milk powder.

The objective is to eliminate the above drawback. The problem is solved by the proposed spray dryer comprising a drying chamber, a blower fan, an auxiliary fan, an air heater, an air distributor, a head and discharge cyclones, hoppers for storing milk powder with cyclones and slide valves, a vibrating sieve, a pneumatic conveying line, in which, according to a utility model, the pneumatic conveying line is additionally equipped with a pipeline connecting the hopper for storing milk powder with the head cyclone.

Loss of milk powder through filters installed at the outlet of the exhaust air from the cyclones of the bunkers for storage of milk powder are inevitable.

When returning the exhaust air from the hoppers through the pipeline to the head cyclone, the separation factor of the milk powder and the exhaust air in it increases.

In addition, the number of filters and, accordingly, the unit costs of their maintenance are reduced.

The utility model is illustrated by drawings.

In FIG. The general scheme of a spray dryer is presented. The installation includes a drying chamber 1, inside of which there is a spray disk 2 with an electric drive 3. In the upper part of the drying chamber there is a casing 4 tangentially connected to the coolant supply pipe, fan 5 and air heater 6. The pneumatic conveying line includes pipelines 7, 8 and 9, fans 10, 11, a filter 12, a head cyclone 13 with a lock gate 14, a discharge cyclone 15 with a lock gate 16, hoppers 17 for storing milk powder with cyclones 18 and slide gates 19. A vibration is connected to the discharge cyclone 15 Goes 20 sieve.

Installation works as follows.

The fan 5, the air heater 6 are turned on and the coolant 4 is supplied through the casing 4 to the drying chamber 1. At the same time, the electric drive 3 is turned on and milk is supplied to the spray disk 2. The dried milk is collected in the conical part of the drying chamber 1 and transported via the pipeline 7 to the discharge cyclone 15. The exhaust air from the drying chamber 1 and the unloading cyclone 15 through the fan 10 enters the head cyclone 13, where it is separated from the milk powder, which is returned through the lock gate 14 to the pipe gadfly 7, and the exhaust air is discharged into the atmosphere by a fan 11 and a filter 12. From the unloading cyclone 15, through a lock gate 16 it enters a vibrating sieve 20, and is transported via a pipe 8 to a cyclone 18, from where milk powder is poured into bins 17 for storage. If necessary, unloading is carried out through the gate valves 19. The exhaust air from the cyclones 18 enters the pipeline 9 and is transported through it to the head cyclone 13, where milk powder particles are separated from it again, and the exhaust air is cleaned in the filter 12 and released into the atmosphere.

Operational experience at OJSC "Yalutorovskmoloko" showed that when working according to the proposed scheme, the loss reduction is 0.2 kg per 100 kg of milk powder.

Claims (1)

A spray dryer including a drying chamber, a blower fan, an auxiliary fan, an air heater, an air distributor, a head and discharge cyclones, milk powder storage bins with cyclones and slide valves, a vibrating sieve, a pneumatic conveying line, characterized in that the pneumatic conveying line is additionally equipped with a pipeline connecting hoppers for storing milk powder with a head cyclone.