DE29821423U1 - Quenching device - Google Patents

Description

Dipl.-Chem. EL FRITZ 98/859

Dr. Dipl.-Phys. R. BASFELD 25.11.1998/EF/Ra

Patent Attorneys Mühlenberg 74 59759 Arnsberg

company

Rembe GmbH Measurement and control technology

Gallbergweg

59929 Brilon

Quenching device"

Description

Applicant: Rembe GmbH, measurement and control technology

Quenching device

The invention relates to a quenching device which, in conjunction with a bursting disc or an equivalent relief device, enables safe pressure relief from dust explosions.

Pressure relief is a method of protecting closed containers and systems from unacceptable pressure increases in the event of a dust explosion. According to VDI guidelines 3673, when pressure relief is used in closed rooms, the relief must be led outside via a pipe in order to protect the rooms and the people working there.

Such a discharge of relief products prevents the release of flames and unburned substances on the one hand, and on the other hand the spread of a pressure wave into the room.

The blow-out pipes currently in use have the disadvantage that they increase the expected reduced explosion pressure to such an extent that in many cases pressure relief can no longer be achieved. Spatial conditions also often make pressure relief via blow-out pipes too complex and difficult to oversee. This has led many operators to prefer the simpler, but considerably more expensive solution in the form of a pressure-resistant design.

The invention is based on the object of creating a device which, in conjunction with a pressure rupture disc or a comparable relief device, eliminates the aforementioned disadvantages and at the same time enables safe pressure relief from possible dust explosions.

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This goal is achieved by connecting a pressure bursting disk or comparable relief device (1) to a hose-like quenching wall (2,3). This quenching device consists of a wave-like, multi-layered layer made of precious metal and glass or rock wool or comparable materials. The layers of precious metal or comparable materials are interspersed with numerous small holes like a sieve. Between the individual precious metal layers there is glass or rock wool or comparable materials. This wall can be arranged in any shape, round or square.

A quenching device in the design described above acts both as a dust filter and as a heat trap. The various layers of precious metal ensure that escaping expansion and combustion gases are brought back to an acceptable temperature and volume level. The stone or glass wool arranged between these layers acts as a dust filter due to the sieve-like design of the precious metal layers. This arrangement, in conjunction with the wave-like shape of the quenching wall,

that the escape of flames, which may be a danger to workers and a source of ignition for secondary explosions, is avoided,

that the release of unburned dust/air mixture, which would encourage the occurrence of secondary explosions, is avoided,

- that due to the volume ratio of the room/container to be relieved, at least partial relief of the pressure wave in the room is guaranteed,

that hot combustion/expansion gases released into the room are cooled down to a safe temperature and volume level,

that during the discharge, in comparison to direct discharge into the open air, there is no significant increase in the reduced explosion pressure.

The present invention ensures effective relief of containers located in enclosed spaces or at-risk areas without the escape of unburned dust and/or flames into the space and without a drastic increase in the reduced explosion pressure and thus the required container strength.

The quenching device can be used in a closed form so that the pressure is only released into the room with a cooled and safe temperature and volume level. An open quenching device is also conceivable. In this case, the side of the quenching device (3) opposite the pressure bursting disc is open so that the pressure vessel can be released into the open air. The quenching device would then mainly have the function of preventing a reduction in the pressure relief effect through the pipeline.

Claims (4)

··* 'SchutSfetfspruche *' Applicant: Rembe GmbH, measuring and control technology 1. Quenching device,
characterized, that a bursting disc or equivalent relief device is connected to a quenching device that enables dust- and/or flame-free pressure relief, 2. Quenching device according to claim 1, characterized in that the walls of the quenching device are constructed from a wave-shaped multi-layered layer made of precious metal and rock or glass wool or comparable materials, so that when the bursting disc or comparable relief device is activated, the free flow of expansion and combustion gases leaving the container is not or only insignificantly impeded, large quantities of ejected combustible dust are retained during a pressure relief situation and combustion and expansion gases are cooled to a safe level, 3. Quenching device according to claims 1 and 2, characterized in that the respective precious metal layers of the quenching wall are permeated with numerous holes like a sieve, 4. Quenching device according to claims 1 to 3,
characterized, that the end of the quenching device opposite the rupture disc or comparable pressure relief device is either closed or opens into a blow-out pipe.