RU2398164C1 - Facility for increased efficiency of direct-flow of drum drier for loose material - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: direct-flow drum drier consists of rotating cylinder case with its inlet part coupled to heat source and loading chute and equipped with system of screw blades in this part. In the main part of the case there is arranged a system of radial blades; also diametre of an inlet part of the case exceeds as much as twice diametre of the main part of the case. Additional system of radial blades is installed in the inlet part of the case after the system of screw blades. The drum is equipped with a three-facet screen in the first third of length of the main part of the case rotating together with the case; each facet of the screen is covered with the mesh with cells decreasing downstream of dried material motion and is equipped with a blade positioned at 45° to surface of the facet.

EFFECT: accelerated supply of loose material into main part of drum and efficient drying in first third of main part of drum.

2 dwg

Description

The invention relates to the drying of bulk materials in a rotating drum and can find application in various industries, and is an improvement on the invention by auth. No. 1262232.

A direct-flow drying drum for bulk materials is known, comprising a rotating cylindrical body connected by an inlet to a heat source and a charging chute and having in this part a system of helical blades, and in the main part a system of radial blades, and the diameter of the inlet of the body is no more than double the diameter of the main part of the body and in the input part of the body after the system of helical blades additionally installed a system of radial blades (see figure 1).

However, such a device does not provide an accelerated flow of bulk material into the main part of the drum, nor does it provide active drying in the first third of the length of the main part of the drum (there is a transshipment of a solid dense mass of raw bulk material).

The objective of the invention is to increase the efficiency of the dryer.

This problem is solved in that in a direct-flow drying drum containing a rotating cylindrical body, connected by the inlet part to a heat source and feed chute and having in this part a system of screw blades, and in the main part - a system of radial blades, and the diameter of the inlet part of the body does not exceed more than twice the diameter of the main body part and in the input part of the body after the system of helical blades, an additional system of radial blades is additionally installed, according to the invention it is equipped with a trihedral sieve in ervoy third length main body portion rotating together with the housing, each face is covered with mesh sieves with decreasing mesh material to be dried in the course of movement and provided with blades arranged at an angle of 45 ° to the face surface.

The direct-flow drying drum for bulk materials contains a rotating cylindrical body 1, connected by an inlet to a heat source 2 and a loading chute 3 and having in this part a system of screw blades 4, and in the main part a system of radial blades 5, and the diameter of the inlet part of the body does not exceed more than twice the diameter of the main part of the housing 1 and in the input part of the housing after the system of screw blades 4 is additionally installed a system of radial blades 6. The increase in the surface of heat and mass transfer is achieved by We install a trihedral sieve 7 with three blades 8 in the first third of the length of the main part of the housing 1 of the drying drum (the trihedral sieve rotates together with the drum casing) (see Figs. 1, 2).

Trihedral sieve 7 is three of the same sieve 10, installed in the grooves of two supporting crosspiece 9. Crossings 9 are attached to a rotating drum in the first third of the length of the housing 1 of the drum (see figure 1). The sieve 10 consists of a closed corner frame with a welded mesh 11. The mesh 11 is with variable cell sizes, and in the direction of the dried material the mesh size of the mesh 11 is reduced. To increase the flow of bulk material from the expanded part of the drum casing 1, each face of the sieve 7 is provided with a blade 8 at an angle of 45 ° to the surface of the face.

Direct-flow drying drum with a trihedral sieve works as follows. The material to be dried is continuously fed via estrus 3 to the inlet of the drum body 1. At the same time, combustion products from the heat source 2 enter the inlet of the drum casing 1.

The screw blades 4, mixing the material, feed it to the system of radial blades 6. After filling this zone, the material begins to flow into the main part of the housing 1 by tilting it towards the discharge chamber 12. The raw material is captured by the radial blades 5, also by the blade 8 and falls on trihedral sieve 7 - the raw material is dispersed through the nets 11. In the first third of the length of the drum casing, the heat and mass transfer surface sharply increases due to the dispersion of the raw material by the nets 11.

Experience has shown: a) an increase in the productivity of a dryer in the sand more than 25%;

b) specific fuel consumption decreased;

c) there was a convergence of the curves of the temperature graphs of sand and exhaust gases, which indicates an increase in the efficiency of use of flue gas heat. Exhaust gases are removed by a smoke exhaust.

Claims (1)

A direct-flow drying drum containing a rotating cylindrical body connected by an inlet to a heat source and feed chute and having in this part a system of screw blades, and in the main part a system of radial blades, the diameter of the input part of the body exceeding no more than twice the diameter of the main part of the body , and in the input part of the housing after the system of helical blades, an additional system of radial blades is installed, characterized in that it is equipped with a trihedral sieve in the first third of the length of the main part case, rotating together with the case, each face of the sieve is covered with a mesh with decreasing cells in the direction of the dried material and equipped with a blade located at an angle of 45 ° to the surface of the face.

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