SU912245A1 - Distributing unit - Google Patents

Description

The invention relates to the separation of stable isotopes, in particular to distillation (distillation) separation devices.

A known separation installation comprising phase inversion nodes, separation stages and flow dividers between stages, made in the form of variable capacity evaporators (1}.

The evaporator-flow dividers used in the known installation successfully solve the problem of dividing the flow, according to the flow rate, into two components: the reverse steam flow and the liquid tray flowing into the next step; however, they are not applicable to dividing the total flow into several liquid flows.

A separating installation is also known, comprising a mass exchange column with parallel pipes and a liquid collector with a flow divider placed between the column and the upper phase reversal unit. This flow divider is adjusted before the start-up of the installation and allows to achieve a satisfactory accuracy of the distribution of the liquid through the pipes.

the moment of the start of operation of the installation 2.

The disadvantage of the installation is the inability to adjust or, in general, control the division of fluid flow between parallel pipes during operation of the installation, when over time deviations from the initial pattern of flow separation occur and the installation operates in non-optimal modes.

The purpose of the invention is to regulate the division of fluid flow in the process.

15 installation operation.

This goal is achieved by the fact that the divider is made of separate elements, each of which consists of a separation chamber, a lifting

20 a tube with an electric heater placed in its lower expanding part and a descending tube, the end of which is located at the level of the upper ends of the pipes.

25

The drawing shows the proposed separation installation.

Claims (2)

The separation unit consists of the lower phase inversion unit 1, a mass transfer column in the form of parallel pipes 2, a liquid collector 3 and the upper phase circulation node 4. In the collector 3 a divider 5 is placed, made of separate elements, each of which consists of separation chambers 6, a lifting tube 7 and an outlet tube 8. The lifting tubes 7 have lower expanding parts 9 in which electric heaters 10 are placed. The elements of the divider 5 are placed on the same Level horizontally. During the installation operation, the liquid phase of the distilled medium from the pipes 2 of the mass transfer column flows into the lower phase inversion unit 1 in which the process of evaporation of the liquid takes place. The steam rises back through the pipes 2, where the process of mass transfer and concentration of the desired isotope takes place at the contact of the phases, and enters the upper phase inversion unit 4, where it is again converted into a liquid phase by condensation. From the upper phase transfer unit, the liquid enters the collector 3, where it is sucked into the riser tubes 7. The suction process is caused by electric heaters 10 which cause some of the liquid to boil. The resulting liquid-vapor bubbles due to the small compared with the homogeneous medium-density liquid through the expanding part 9 rushes through the tube 7c chamber separation. In the chamber, the liquid is separated from the steam and, under the influence of gravity, is lowered through the tube 8 into one of the parallel tubes 2. The fluid level in the collector 3 itself is set slightly below the bottoms of the chambers 6. For each element of the divider 5 to operate, evaporation is sufficient at power The electric heater 10 is approximately a thousandth of the fluid flow, and therefore the required electrical power is very small. In addition, the flow rate of the fluid through each of the elements of the divider 5 is determined by the amount of vapor produced. Since the liquid in the distillation column is always at saturation conditions, the power of the electric heater 10 entirely goes to the formation of a vapor phase. In this connection, by adjusting the electrical power of the lifting tube heaters, any desired fluid flow divisions can be obtained. Since the regulation of the indicated electrical powers of the heaters 10 is easy to implement and does not require any moving mechanisms inside the unit, with their help it is possible to regulate the flow division with high reliability and during unit operation. The proposed design, with an appropriate stabilization of the power of the heater, allows achieving the correlation of fluid flow through each assembly with an accuracy of 1%. Dividing flow controllers can be included in external regulatory systems or in an automated process control system, which allows the separation process to be conducted under optimal conditions with a corresponding improvement in the technique and economic performance of the separation plant as a whole. DETAILED DESCRIPTION OF THE INVENTION A separation installation comprising lower and upper inversion nodes, a mass exchange column with parallel pipes and a liquid collector with a flow divider placed between the column and the upper phase inversion node, in order to control the division of the fluid flow in the process operation, the divider is made of separate elements, each of which consists of a separation chamber, a lifting tube with an electric heater placed in its lower expanding part, and a lowering tube, the end of which The hinge is located at the upper end of the pipes. Sources of information taken into consideration at the examination of 1. Asagkani P.Ya. et al. Plant for concentrating isotope 13 With the distillation of carbon monoxide. Production of isotopes, M., Atomizdat, 1973, p. 487. 2.Olevsky V.M., Ruchinsky V.R. Rectification of thermally unstable products. M. Chemistry -, 1972, s, 19. 7.3 ID s 5 6