SU488596A1 - Sump - Google Patents

Description

(54) DRAWER

The invention relates to the separation of two-phase systems, for example for the purification of water. A device is known that consists of channels that are tilted to the horizon and are fixed in a tube sheet, equipped with an o-sludge system, connections for cleaning the liquid and discharging the clarified liquid. In the known device, the liquid phase moves along the channel from bottom to top, and the solid phase (precipitated particles) - in the opposite direction - from top to bottom. The movement of the solid phase along the bottom of the channel is carried out under the action of the own weight of the precipitated particles. Different sized particles are known to have different deposition rates. Larger particles will appear at the very beginning of the channels (the lower part of them), and smaller particles will precipitate at the end of the channels (the upper part of them). Large particles, having a relatively large weight, will easily slide down along the bottom of the channels. A piece of chalk . Because of the relatively small 14) weight, the particles that are deposited in the top of the chambers will slide down along the bottom of the cave at a very low speed. The path that the particles will travel along the bottom of the channel is also unequal: larger particles will travel a distance equal to a part of the length of the channel, more, smaller ones - equal to almost the entire length of the channel. All this will lead to the accumulation of small particles at the bottom of the channel with the inevitable compaction of the layer under the action of the weight of the water layer above the bottom of the channel. To remove such particles, it is necessary to stop the settler and flush it with a reverse flow of water at high speed (operation mode is cyclical). The smaller the particles that form the solid phase of the medium, the more this deficiency manifests itself. The movement of the liquid and solid phases in opposite directions impairs the flow hydraulics: vortices occur at the phase boundary, reducing the effect of clarification and produce, the sump capacity. The purpose of the invention is to increase the effectiveness of the separation of two-phase systems.

Jinf of this sediment removal system is located in front of the tube sheet installed in the lower part of the settling tank, and the channels are U-shaped.

The drawing shows the proposed sump.

The sump consists of a 20–45 casing end tilted to the horizon under the fragile side, closed with end caps. The bottom cover has a tube grid 2, in the opening of which tubes of cassettes 3 having a U-shape are inserted. The cassettes 3 are connected by nozzles 4 to a zone of clarified liquid, from which it goes out of the sump through the pipe 5 of the outlet of the clarified liquid. The cassettes 3 consist of an upper cover, side walls and an end bridge 6 in the lower part of the cassettes. The nozzles 4 are fixed in bridges 6. The cassettes 3 are mounted so that the lower edges of the side walls and the end bridge of the upper row of cassettes cassettes. the gap is within 0, 5-2; 5 mm. In cassettes 3 there is no bottom cover and a second (top) end jumper. In the casing 1 of the settler there are nozzles 7 for supplying the cleaned fluid and 8 for the sludge drainage system.

Works sump as follows

A two-phase system is fed through pipe 7 into a sump. Fluid flow enters cassettes 3; through their open end. In cassettes 3 with a height of 20-30 mm, the liquid moves at a speed of 0.5-5 mm / sec. The solid particles suspended in the liquid are acted upon by the forces: hydrodynamic P, due to fluid movement along cassettes 3, gravitational P, due to particle weight, and hydrodynamic P, .., caused by continuous selection of water particles from the cassettes into the gap between the rows of these cassettes. Under the influence of quiet: forces suspended in water, the particles were deposited on the upper lids of the underlying rows of cassettes under the action of their own

The suction and flow of a portion of the continuously removed liquid is carried to the bottom of the sump. The precipitate is continuously removed along with a part of the liquid from the settling tank through the pipe 8,

Relatively large particles of solid

the phases precipitate in the upper part of the cassettes 3. Under the action of a relatively large own weight, they are easily mixed in the lower part of the sludge removal system. Smaller particles precipitate at the end of the cassettes 3, i.e., at the bottom of them. The removal of these particles is facilitated by the flow in the gap between the rows of cassettes and the fact that

these particles travel a small path (less than 1/2 the length of the cassette).

Hydrodynamic force Р „, direction

the understanding of which coincides with the direction of the gravitational force P, causes

increase of the effect of clarification and production;

Subject invention

A sump for separating two-phase systems with obliquely mounted channels fixed in a tube sheet

equipped with a sludge drainage system, connections for supplying the cleaned liquid and draining the clarified liquid, characterized in that, in order to increase the separation efficiency, the sludge drainage system is placed in front of the tube sheet installed at the bottom of the sedimentation tank, and the channels are U-shaped.