Inner Refractory Lining, Ash Removal

Maintenance

Inner Refractory Lining

The firebox and heat exchanger tube access areas are lined with high-temperature, fibrous ceramic insulation panels (much like spacecraft tiles). The surface of these panels is hardened to resist normal wear from brushing with a non-metal brush. The panels are not designed to be cleaned with the scraper or other sharp objects. Caution must be taken when cleaning these panels because damage to them is not covered by the warranty. The ash pan slides into the unit on a rail system. This keeps the ash pan from contacting the sides and floor refractory panels. Caution must be taken to ensure there is nothing on the floor surface prior to inserting the ash pan.

Ash Removal

It is recommended to remove the ashes when the boiler is not in operation. This lessens the chances of coming in contact with hot surfaces. Ashes can be removed while in operation but, extra care must be taken including wearing protective gloves.

Open The Firebox Door

Swing the latch downward and open the door as shown in fig. 21.

NOTE: Keep hopper lid, and firebox door closed during operation and maintain all seals in good condition. Air leaks will cause low draft conditions, which will result in feeder shutdown.

Disposal of Ashes:

Ashes should be placed in a steel container with a tight fitting lid. The closed container of ashes should be moved outdoors immediately and placed on a non- combustible floor or on the ground, well away from all combustible materials, pending final disposal. If ashes are disposed of by burial in soil or otherwise locally dispersed, they should be retained in the closed container until all cinders have thoroughly cooled. Other waste shall not be placed in this container.

Firebox Refractory

Linings

Fig. 21

Soot and Flyash: Formation and Need for Removal

The products of combustion will contain small particles of flyash. The flyash will collect in the exhaust venting system and restrict the flow of the flue gases. Incomplete combustion, such as occurs during startup, shutdown, or incorrect operation of the boiler will lead to some soot formation which will collect in the exhaust venting system. The exhaust venting system should be inspected at least twice monthly until an apropriate cleaning schedule is determined.