SU768476A1 - Cyclone - Google Patents

Description

This invention relates to a technique for cleaning emissions of industrial emissions and aspiration. The cyclone can be used in the mining and metallurgical industry and other branches of the national economy. . Known cyclone for cleaning gas flow from suspended particles, including a cylindrical-conical body, a tangential inlet c. a cylindrical part of the body, a pipe branch pipe in the conical part and an exhaust pipe, the tapered end of which is located inside the core. Fusus} The disadvantage of the known cyclone is high aerodynamic resistance, a significant part of which is associated with the loss of energy 1 and intensive gas rotational motion in the exhaust pipe. In order to reduce energy losses by reducing the aerodynamic resistance by partially fixing the rotation of the gas flow in the exhaust pipe, the end of the exhaust pipe was proposed to be made with the angle of constriction increased. The invention is illustrated in the drawing. The cyclone consists of a cylindrical housing 1, a tangential inlet 2 in the cylindrical part of the housing, an exhaust pipe 3, the tapered end of which is located. inside the case and. is made with an increasing angle of constriction, and a dust extraction pipe of the neck 4, located in. conical part of the body. The cyclone works as follows. The gas to be cleaned through the inlet 2 is fed tangentially into the cylindrical part of the body 1 of the cyclone, as a result of which it twists together with the particles suspended in the gas. Under the action of centrifugal forces caused by the rotation of the medium, the particles are pressed against the walls of the cyclone and moving in a downward spiral to the side of the dust removal pipe 4. The cleaned gas swirls back into the central zone of the body and leaves through the exhaust pipe 3. It is known that the minimum resistance coefficient when moving

the swirling flow is provided by a diffuser whose central angle of expansion is equal to the swirling angle of the flow, the tangent of which is equal to the ratio of the peripheral speed to the axial speed, since the radial velocity is small compared to the axial and tangential speeds 2, g.

The twist angle of the flow may depend, in particular, on the shape of the diffuser. In order for the circumferential velocity tube in the exhaust pipe to attenuate, it is necessary that this angle be reduced along the pipe notoKa along the pipe, which ensures the elongation of the end of the exhaust pipe with increasing angle of contraction. The minimum resistance is achieved by the equality of the angle of constriction to the angle of twist of the flow in each section. The inner diameter of the exhaust pipe is chosen for the performance of the cyclone.

Laboratory tests conducted at the All-Union Institute of Labor Protection of the All-Union Central Council of Trade Unions showed that as a result of an exhaust pipe designed as a diffuser constructed according to this principle, the aerodynamic resistance of the cyclone is reduced by 30-40% compared to a similar cyclone, where the accumulator is designed as a cylinder.

At the same time, dust collection efficiency is increased by 1-1.5%.

The increase in efficiency is due to the fact that a decrease in twist in the flow of the screw flow reduces the inflow of the pelvis from the layers removed from it 4.

The effluent for the helical flow in a cyclone is the exhaust pipe, and the layers of air, which are good for it, lie adjacent to the inner walls of the cylindrical body and therefore get dust in the process of cyclone operation.

Reducing the flow of gas from these layers to the fly-over pipe reduces the entrainment of already separated dust with it.

Economic efficiency with maximum use of the invention is expressed in reducing the cost of electricity per cyclone process.

Furthermore, the invention does not incur the cost of manufacturing additional devices for reducing the aerodynamic drag of the cyclone.

The simultaneous increase in dust collection efficiency increases the overall technical and economic effect.

Claims (4)

1.Aliev G.M.A. Dust collection in the production of refractories. Metallurgists, 1971, p.33-34, fig.14. 2.Deych ME, Zar nkin A.E. Hydrodynamics of diffusers and exhaust pipes of pipe machines. M., Energie, 1970, p. 322-3.27. 3. Gubin M.F. Some ways to further increase the efficiency of aspirated vacuum turbines. Proceedings of IISS, issue 16, M.-L. 1956. 4.Vasilyev OF Mechanics of screw and circulation pots, M.-L., 1958, p.30.