Shut-off Valve as a Discharging Valve When Extracting Glycerin from Waste

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Lutz Pumpen GmbH

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Emil Kammerer GmbH

The discharging valve is typically installed under a thin film evaporator or dryer that possesses a vacuum in the range of 3 to 10 mbar absolutely. Through evaporation and various distillation stages, the majority of the glycerin is extracted. A residue of MONG, combined with the remaining glycerin, is deposited at the bottom. The valve directly underneath consists of two completely sealing shut-off valves that are connected to each other via a valve container and locked against each other.

Gallery

The product reaches the upper slide gate valve and is saved up here. This upper slide gate valve is then opened so that the remaining products can pass through a valve container to the lower slide gate valve; the upper slide gate valve is closed. The space between both shut-off valves is placed under atmosphere conditions. Only then can the MONG be discharged. The waste or salt residues usually have a glycerin content of around 3-10 %.

Slide gate valves for special applications

In practice, the slide gate valve models FK and FDK with integrated rinsing devices from Kammerer have proved themselves in this specialist area. The first one or two letters refer to the sealing system, while the last letter indicates the model of the shut-off valve. The K housing prevents possible depositing of the product and, as a result, the build-up of product due to its downward funnel-shaped, tapered construction. The F and FD sealing systems are particularly favoured for gas-tight shut-off requirements: There is an active pressing of the respective impermeable material here and, afterwards, also an active pushing back of the seal in the FD version. This mechanism ensures that the seals are as gentle as possible while also being completely reliable.

Results

First of all, the discharging valves guarantee a reliably continuous discharge every 4 to 5 minutes. Secondly, the glycerin can be extracted in a significantly higher quantity for reuse as the waste product can be discharged in a drier form, thus containing less glycerin. Thirdly, a significant increase in the service life of up to 12 months has been achieved in all plants. The investment in a discharging valve system usually pays for itself within one to two years.

Options

Another typical field of application in this context: Shut-off valves for the discontinuous discharge of waste. Customers who work with vacuum chambers have used the shut-off valve in the simple version. The residual products used pass through the shut-off valve into a container. Once this container is filled to a certain level, the vacuum chamber is evacuated, enabling the container to be replaced with an empty one.

* The author works for Emil Kammerer, Tel. +49 (0) 2202 95528-0

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