CS251967B1 - Steam ejector for steam, steam-emulsion and steam-aerosol mixes for internal surfaces of tubes, pipes and vessels - Google Patents

Abstract

The solution > relates to a steam ejector, i.e. a sprayer for decontamination of the inner surfaces of pipes, ducts and containers with steam, steam-emulsion and steam-aerosol mixtures. The essence is a head, which consists of a body and a front. The body of the ejector contains a steam space, connected by a steam hose to a steam source and at least one liquid space, connected by a liquid hose to a decontamination solution reservoir. The steam space opens into the surroundings of the head through a circular steam gap. The steam gap is defined on one side by the front and on the other side by the edge of the body. At least one liquid space opens into the steam gap through at least one liquid gap.

Description

251967

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam ejector, i.e., a dewaterer for decontamination of internal piping and vapor pipes, steam-emulsion and steam-aerosol mixtures in nuclear power plants, as well as in other open radioactive sources. .

So far, the inner surfaces of pipes, tubes and containers have been decontaminated with steam and steam-emulsion or steam-aerosol mixers with single or triple spray nozzles, but each nozzle has been provided with a spray nozzle. As a result, such a nozzle of the mixed-dusted decontamination solution only steamed and did not at all utilize the mechanical effect of steam on the deconta- mination process, which, as is generally known, may be significant in some circumstances.

This serious drawback is eliminated by the steam ejector according to the present invention in that its vapor passage opens into the vicinity of the head with a circular vapor gap defined on one side and at least on the other side of the body into the vapor gap at least one fluid space by at least one circular fluid slot.

Unlike previously used steam ejectors, the proposed steam ejector nozzle with a small "point" hole, but in the form of a circular slot. This slot distributes the highly efficient steam decontamination effect on all sides of the ejector head. This effect is particularly useful in the decontamination of internal surfaces of contaminated pipes, pipes and containers. In order to detect the correct function of the ejector with a circular aperture, a fluid space must enter the aperture, not a "pointed" or "segmental" aperture, but a circular liquid slot.

Thus, in addition to atomizing the decontamination solution and its chemical and physical effect, the steam ejector of the present invention also provides a mechanical effect of the vapor stream throughout the tube, tube and vessel cross-section simultaneously. At the same time, the possibility of utilizing all of the above effects will result in a substantial increase in the de-contaminating effect and hence of the decontamination factor. An example of a steam ejector according to the invention shown in the attached drawing.

It is a steam ejector, the metal head 1 of which comprises a body 2 and a front 3. The body 2 comprises two pipes, which are centered on one another. The head space 4 of the head includes an inner tube space connected by a flexible coarse hose 5 to the source 6.

The liquid space 7 of the head 1 has a space between the two tubes. This is in the back part blinded and connected by a semi-flexible thinner liquid hose 8 to the decontamination solution reservoir 9. The front ends of the two body tubes 2 have edges in one plane and are partially interspersed in the interspace so that only a narrow circular liquid region 11 extending into the vapor gap 10 remains between them.

The steam gap 10 is delimited on one side by the front ends of said tubes and on the other hand by the bottom of the face 3. In addition, the radius of the narrowest constriction of the parenthesis 10 must be somewhat smaller than the radius of the liquid gap 11 in order to ensure spontaneous suction of the liquid flow. House of couples.

The steam gap 10 is associated with a steam chamber 4 which is perforated by a perforated tab 12 into which a screw 13 of the face 3 is screwed.

The head 1 is inserted with the hoses into a contoured pipe, pipe or vessel. From the steam source 6, it is introduced into the head 1 under pressure, which flows through the steam slot 10 perpendicularly to the inner surface of the pipe, pipe, or vessel. At the same time, the steam flow in the vapor gap 10 creates a vacuum in the vicinity of the mouth of the liquid gap 11, thereby sucking the decontamination solution from the reservoir 9 into the liquid space 7 through the liquid gap 11 into the vapor slot 10, where the decontamination solution is sprayed and injected into the contaminated ] pipes, pipes, or containers. There, the vapor emulsion or the steam aerosol is chemically and physico-chemically bonded to the surface to be contaminated.

Due to its strong mechanical action, steam mainly removes weakly bound radioactive contamination, but also the parts released by the de-contamination solution. In this way, the decontamination of the inner surfaces of the tubes, pipes and vessels is achieved by a substantial and incomparably more effective than deconta- mination using the existing steam engines. The steam ejector according to the invention is simple, its production is relatively easy and not expensive.

The invention can be used in nuclear power plants, especially in the deconta- mination of pipes, for example steam generators such as other piping systems, vessels, containers and the like. It is also advantageous to use it for decontamination of nuclear power stations for disposal.

Claims (1)

SUBJECT The steam / ejector for decontamination of the inner surfaces of tubes, pipes and vessels by steam, pumo-emulsion and vapor-aerosol mixtures is characterized in that its vapor space (4) opens into the vicinity of the head (11) through a circular slot (10) defined on one sulphate face (31 and on the other side) BACKGROUND OF THE INVENTION at least one liquid space (7) opens through the edge of the body (2) and into the steam gap (10) by at least one circular liquid gap (11), the steam space (4) being blocked by a perforated partition (12) into which a screw is screwed (13) forehead (3).