SU844037A1 - Reaction apparatus - Google Patents

Description

one

The invention relates to apparatus with mixing devices used for mixing liquid media, both pure and containing insoluble gases and solid particles, and for carrying out chemical reactions.

Known reaction apparatus with a submersible pump, containing a vertical vessel with a built-in glass, in which a shielded sealed electric drive is installed. A mixing device is installed on the console of the shaft of the electric drive going into the reaction zone of the apparatus, and a centrifugal pump completely immersed in the working gear 1 is installed on the same shaft.

When the apparatus is in operation, a submersible centrifugal pump takes in (sucks in) liquid from the apparatus and feeds it back into the apparatus, with some of the fluid passing into the rotor cavity of the electric drive with bearings. This part of the fluid goes to lubricate the bearings and removes heat from the rotor of the electric drive.

The disadvantage of such an apparatus is its limited use: firstly, only clean liquids can be processed in the apparatus, without the content of solid particles, since the working medium is taken

for bearing lubrication; secondly, the submersible pump is used only for additional mixing and cannot be used for pumping out the working medium, as the actuator bearings are lubricated with the working medium coming from the apparatus, and when emptying the latter, they can remain unlubricated and fail.

In chemical processes, when performing a series of processes, it becomes necessary to mix a liquid with different densities, as well as liquids containing solid particles, which, when the mixing is stopped, quickly precipitate. To discharge such media from the apparatus, it is necessary to pump out by means of submersible centrifugal pumps directly from the apparatus’s reaction cavity, while the mixing device is running, to prevent separation of the reaction medium into components having different densities, as well as to prevent sedimentation.

The proposed apparatus is closest to the reaction apparatus with a submersible pump, including a vertically placed vessel with a sealed, shielded electric drive mounted on it. A mixing device is installed on the console of the shaft coming out into the reaction chamber of the apparatus, and a chain pump is installed slightly above it on the same shaft. When the apparatus is centered, the centrifugal pump, immersed in the working medium, takes the liquid from the apparatus and delivers it through the discharge pipe to the consumer. Sub-drives of the electric drive are self-lubricated, so their performance does not depend on the composition of the working medium in the device 2j.

However, in such an apparatus, the suction of the liquid into the centrifugal pump is performed above the level of the installed agitator at a considerable distance from the bottom of the apparatus, therefore the working medium can be pumped out from the apparatus only partially. It is impossible to extend the sleeve of the impeller of the centrifugal pump and position it structurally closer to the bottom of the apparatus, since this prevents the blades of the mixing device.

In addition, when processing low-boiling fluids for pumping them with a submersible centrifugal pump, considerable suction pressure is required, which requires an additional supply of pressure to the apparatus under inert gas, since centrifugal pumps with the best anti-cavitation qualities have limitations on suction height, and when pumping boiling liquids they need pressure suction.

The aim of the invention is to increase the productivity of the apparatus by ensuring complete removal of the reaction medium.

The goal is achieved by the fact that the reaction apparatus, which includes a housing with a submersible pump, a shielded electric drive and a paddle stirrer, has a pump impeller fitted with a hollow bushing mounted on the inlet, on the outside of which the blades of the agitator are fixed, and an intake device in the form of a screw tapes.

One end of the hollow sleeve is rigidly connected to the impeller of the centrifugal pump, and the other is placed at the bottom of the apparatus, at a distance that allows the passage of the working medium into the hollow sleeve. The stirring of the reaction medium is ensured by the paddles of the stirrer mounted on the outside of the hollow bushing. To create a backpressure (pressure) in front of the impeller of the centrifugal pump during processing and pumping of boiling liquids in the hollow sleeve (from the bottom of the apparatus), an intake device in the form of a helical tape is installed.

Thus, the installation of a hollow sleeve with blades, through which the liquid is supplied from the zone located at the bottom of the apparatus, provides almost

complete emptying of the apparatus with continuous mixing of the working environment.

Installing the intake device in the hollow

the sleeve allows the creation of a prop necessary to create conditions for the non-cavitation operation of a centrifugal pump when

pumping out low-boiling liquids.

FIG. 1 shows the proposed apparatus; in fig. 2 — node 1 of FIG. one.

The device includes a housing 1, a tumbler 2, a hermetically shielded electric actuator 3, a mixing device 4, an impeller 5 of a centrifugal pump, a pump housing 6, a pressure pipe 7, a drain chamber 8, a pipe At the medium pickup, shut-off valves W and P. The device 4 consists of hollow sleeve 12, paddle stirrer 13 and intake device 14 in the form of a helical tape. Wheel 5 consists of a main disk.

15 and the covering disk 16.

The device can be executed both with a glass 2, and without it. In the latter case, the drive is mounted on the lid of the apparatus. The tumbler 2, in which the drive is located, serves only to reduce the console of the drive shaft. During operation, the body 1 of the apparatus is filled with a working medium from such a calculation that the liquid level in the apparatus is higher

the level of installation of the centrifugal pump, i.e. the pump to be completely immersed in the liquid. The mixing of the working medium in the apparatus is carried out both by a mixing device and

additionally due to the work of a submersible centrifugal pump. The additional circulation of liquid due to the operation of the pump occurs as follows: the working medium enters the device 14, then

passes in the sleeve 12, enters the wheel 5 and then into the pump housing 6. After that, the liquid is directed to the pipe 7 and through the valve 10, and the pipe 8 enters the apparatus again.

llpH pumping out the working medium from the apparatus, the valve 10 closes and opens the valve 11. Then the working medium from the pipe 7 will flow through the valve 11 into the pipe 9 and further to the consumer.

Pa figs. 1 shows an apparatus with one electric drive, a mixing device and a submersible centrifugal pump. Depending on the volume of the device, the number of electric drives that mix

devices and submersible pumps installed in it, to be different: from one or more, while some of them can be installed without submersible pumps.

Due to such a construction of a mixing device and a submersible centrifugal pump, it is possible to suction the working medium in close proximity to the bottom of the apparatus and to perform almost complete pumping.

product from it. The presence of the intake device in the form of a helical tape provides the ability to remove low-boiling liquids without additional backwater. Installing the agitator blades on the hollow bushing in the vicinity of the submersible pump makes it possible to maintain solid particles in a suspended state, also preventing the separation of liquids of various densities, and to pump the product out of the apparatus without changing its dispersed structure.

The use of reaction apparatus with a submersible pump in petrochemical plants and plants gives a significant economic effect.

Claims (2)

Invention Formula Reaction apparatus including a housing with a submersible pump, shielded electric drive and paddle stirrer, characterized in that, in order to increase the productivity of the apparatus by ensuring complete removal of the reaction medium, the impeller of the pump is equipped with a hollow bushing installed at the inlet, on the outside of which the agitator blades are fixed, and an intake device in the bushing in the form of a screw tapes. Sources of information taken into account during the examination 1. Patent of Germany No. 1140177, cl. 12e, 4/01, 1963. 2. Vane pumps. Ed. L.P. Grenko and A.N. Papir. L., “Mechanical Engineering, 1975, p. 336.