SU25491A1 - Drying for herbal products - Google Patents

Description

The invention relates to dryers for plant products, using conveyor belts for moving them through a number of chambers with different modes and using recycling drying agent.

In the proposed dryer, the drying is performed at the extreme by means of a mixture of air sucked in from the outside and heated in the heaters, and combustion products coming from the superheater furnace, what is the mixture that passes through the layer of the dried product placed on the conveyor is partly emitted into the atmosphere, and partly comes heaters for reheating and further recycling along the same path; In the middle chambers, the drying is carried out with superheated steam in the superheater, which enters the chambers and, after producing the drying of the product, is sent partly to the heaters to warm the air in them and partly back to the superheater for further recycling.

In FIG. 1 is a top view of a dryer for plant products; FIG. 2 is a vertical longitudinal section of it; FIG. 3-cross section of medium chambers and superheater; FIG. 4 is the same, extreme cameras and. air heater.

The dryer for vegetable products, beet chips, fruits, peat, etc., is channel 3, divided by partitions into four reamers A, B, C T, through which the endless conveyor belt 7 passes, stretches over two drums 10 and is supported rollers 8; The belt is tensioned using tool 12. In order to create a relative tightness of the chambers, guards are attached to the partitions above the upper working branch of the conveyor 7, which, when the conveyor moves, slides over the product to be dried. In medium chambers B and C, drying is carried out with heated steam from a superheater 1 consisting of a series (tubes) and located above the furnace 27, equipped with a retractable mechanical grate 26. Steam goes through pipe 25 to the bottom of the chamber E and carried along by current, created by the fan 5, passes through the aperture of the metal conveyor belt and a layer of the product being dried into the upper part L of the chamber, from where steam saturated with moisture from the product is directed through pipe 4 partially into the heater 2 and under the action of the fan 16 into the superheater 1 for further recirculation along the indicated path. If necessary, turn off the superheater, the steam pipes are filled with water and the gases are exhausted through the chimney into the atmosphere. In the end chambers A and H, the air is heated by sucked in air tubes, which is mixed with raising the temperature of drying with combustion products from boar 22, injected by smoke exhausters 20. Plate heaters 2 with chambers A and L are heated with waste steam from chambers S and /. The mixture of air heated in the heater and the burning products enters the lower part of chambers L and P, and passes through the upper working branch of the conveyor with the dried product on it, enters the upper part of chambers, from where the fan 5 is carried back to the heater, and part of it is discharged into the atmosphere through pipe 24. The product to be dried enters through a feed hopper 14, equipped with a turnstile, on an inclined shield 23 divided by partitions that ensure uniform distribution of the product on the conveyor 7, equalization-vaets cylindrical Grable E 13. After passing the whole drying cycle in chambers A, B, S and -T, dried product ssy laets the sloping shield letstochny on conveyor 11 and discharged from the dryer. The entire system of both gas and steam pipes is controlled by dampers.

The subject matter of the invention.

Dryer for plant products, using a belt conveyor to move them through a number of chambers with different modes and using recirculation of a drying agent, characterized in that in the end chambers D and -D the drying is performed with a mixture of sucked outside air and combustion products entering from the furnace 27 through the burs 22 to the lower part of said chambers for passing from it through the upper working branch of the conveyor 7 and the product being dried to their upper part and from here partially to the atmosphere through the pipe 24, partly to the heaters 2 dl heating and further recycling along the same path, in the middle chambers 5 and S, drying is carried out with superheated steam, obtained in the superheater 1 placed above the furnace 27 and directed from it to the lower part E of the said chambers and further through the product to the upper part of them and from here partially into the heaters 2 for heating the agent circulating in them from chambers A to D, partly back to the superheater 1 for further recirculation along the indicated path.

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