RU2264866C1 - Mode of processing of equipment's surfaces - Google Patents

Abstract

FIELD: the invention refers to the field of division of isotopes with centrifugal method and may be used in production of enriched isotopes of uranium and other elements in cascades of gas centrifuges.

SUBSTANCE: The mode is in that that routes of the gas centrifuge operating on a working ( nominal) frequency of rotation on an inert working gas in established procedure, gives fluoridized compound which passivates surfaces, interacts with organic matters and water, transfers their volatile compounds which are moved off out of the equipment by the flows of working gas.

EFFECT: the invention provides augmentation of resort reliability of gas centrifuges, maintains their productivity and prevents clogging of the routes of gas centrifuges due to moving off from the equipment's surfaces of compounds participating in corrosive processes.

3 cl

Description

The invention relates to the industrial production of enriched uranium isotopes and isotopes of other elements by centrifugal method.

Centrifugal production of enriched isotopes is based on the use of special machines - gas centrifuges.

In gas centrifuges made using various organic composite materials, the separation of organic products of gasification and water occurs, which is especially intense in the initial period of operation.

The interaction of the released products with the working gases (including fluorides of the elements) leads to the loss of the working gas, the formation of corrosive deposits, reduced cross-country ability, and all this to reduce the productivity and resource reliability of the separation equipment.

In order to reduce negative processes for new equipment, commissioning procedures are used, including:

- vacuum drying of gas centrifuges;

- Freoning of centrifugal equipment.

In this commissioning cycle, a significant part of the products involved in the formation of corrosion deposits is removed. But, as it has been established by numerous studies, during the passivation period and the initial period of operation on working gas due to the active interaction of the working gas with the residues of the burning products and water, the rate of formation of corrosion deposits is very high and can exceed the established operational level by one, two orders of magnitude. In the same period, initial foci of deposits are formed, which during operation progress, develop and reduce the permeability of gas routes and the resource reliability of gas centrifuges.

The invention is aimed at increasing the resource reliability of gas centrifuges, maintaining the performance of gas centrifuges by reducing the amount of corrosion deposits and preventing clogging of the paths of gas centrifuges by removing products involved in corrosion processes from equipment surfaces.

Implementation of the proposed method is as follows:

1. in accordance with the regulations, vacuum drying and freoning of new gas centrifuges is carried out;

2. at the end of freonation, instead of passivation with a working gas, gas fluffers (for example, halogen fluorides: BrF ₅ , JF ₇ , JF ₅ , ClF ₃ , etc.);

3. the organic substances and water remaining on the equipment surface interact with the fluorinating compound to form volatile compounds that are removed from the equipment with gas streams;

4. at the end of the processing process, practically no substances remain on the surfaces that can interact with the working gas (in particular with fluorides of the elements) and form corrosion deposits;

5. The equipment is filled with working gas and put into operation.

Implementation of the above procedure with the supply of fluorinating agent according to a specially developed algorithm to gas centrifuges operating in an inert working gas in specially selected hydraulic modes ensures a decrease in the amount of corrosion deposits in gas centrifuges and in gas centrifuge routes. This decrease leads to the preservation of resource reliability and productivity of gas centrifuges.

Claims (3)

1. The method of surface treatment of equipment, which consists in the fact that in the paths of a gas centrifuge operating at a working (nominal) rotational speed on an inert working gas in the established mode, a fluorinating compound is supplied that passivates the surfaces, interacts with organic substances and water, transfers them into volatile compounds that are removed from the equipment by streams of working gas. 2. The method according to claim 1, characterized in that the fluorinating compound in a predetermined quantity is fed to the gas centrifuge feed path, and the resulting products are discharged through the light fraction path, or the heavy fraction path, or through both paths with the established flow ratio, while the other the stream is returned to the gas centrifuge. 3. The method according to claim 1, characterized in that the fluorinating compound in a predetermined amount is fed to the heavy fraction route of the gas centrifuge, and the resulting compounds are discharged through the light fraction route or through the gas centrifuge supply path, while the light fraction stream is returned to the heavy fraction path gas centrifuge.