Clayton-Power-Plant-Presentation

CLAYTON HOTWELLS

The Clayton Hotwell has been specially designed for use as a multi-function vessel which will:-

Provide a Continuous Flow of Water to the Clayton Steam Generator Receive Returned Condensate De-gas the Raw Feedwater

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Blend Water Treatment Chemicals

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Horizontal Hotwell

‰ The feedwater supply from the Clayton Hotwell can be fed to one or more steam generators. The water content is automatically maintained at the correct level to ensure sufficient supply for all phases of operation. The Clayton Hotwell also acts as a break tank. ‰ Low pressure condensate returned from steam-using equipment can be fed directly into the Clayton Hotwell. A feature of the Clayton design is that condensate from the steam trap on the Clayton Steam Generator is recovered and directed to the hotwell to save water, energy and chemicals. The hotwell is also used as a collecting vessel to assist the rapid start-up that the Clayton Steam Generator is well known for. ‰ Degassing of raw feedwater dispels oxygen to protect the metal surfaces of a boiler against corrosion. The Clayton Hotwell is an atmospheric partial deaerator in which the temperature is maintained at around 95 O C by means of an automatic steam heating system to supplement heat provided by any returned condensate. The high temperature and residence time in the hotwell dispels oxygen and carbon dioxide. The cost of chemical treatment is therefore reduced to a minimum. ‰ The Clayton Hotwell is a convenient place to blend water treatment chemicals since the elevated temperature and residence time in the hotwell assists chemical activation .

CONTROLS AND FITTINGS Every Clayton hotwell is provided with automatic controls to maintain water level and temperature. Indicators are also supplied so that the operator can monitor level and temperature. Condensate and steam for heating is injected under the water level by means of specially designed sparger pipes which are supplied as standard equipment. HOTWELL SELECTION Clayton Hotwells are either horizontal or space-saving vertical vessels and are selected to match the Clayton Steam Generator system being supplied. If the height

of the hotwell does not provide sufficient head of water for the Clayton Feedwater Pump a small booster pumps can be used. On systems where there is a large volume of returned condensate or high pressure condensate, consideration should be given to the use of a pressurise deaerator or receiver which can reduce running costs.

Vertical Hotwell

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