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Bag filters for solid fuel boiler dedusting

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The Gidly catalog includes baghouse units that are directly designed for use in applications for solid fuel boiler dedusting. We are offering 13 basic baghouse units for extraction of dust from solid fuel boilers. The baghouse units are graded according to the required volumetric airflow.

Parameters of the dust

The temperature of the gases exhausted from the boiler is about 150 ° C to 180 ° C depending on the boiler operation status and type. Because it is a combustion source, the exhausted media are products of combustion. The proportion of water in the fuel increases the moisture content of the exhaust gas – there is therefore a risk of vapor condensation inside the ductwork and the baghouse. The extraction technology has to be thermally insulated and its hopper heated. The dust from the boiler is very fine, dark, dry and abrasive.

Boiler dedusting

The boiler manufacturer always provides the required ammount of vacuum and the amount of gas exhausted at a defined temperature. The function of the extraction system then directly affects the function of the boiler. The flue gas temperature is usually as low as 150 ° C to 180 ° C when sucked into the extraction system. A cyclone deduster must be installed in front of the baghouse to ensure the separation of coarse particles from exhaust gases – including sparks resulted from combustion. The cyclone deduster then reduces the risk of burning of the bags by the burning particles The bag medium of the must be made of materials with a temperature resistance of up to 200 ° C. The filtering device should be thermally insulated, the hopper of the baghouse is electrically heated by a resistive cable. We also recommend to heat the conveyors. The extraction flow rate of the dedusting system is controlled with the fan speed through an invertor. The fan is located on the clean baghouse side, ie behind. The vacuum sensor is placed in the pipeline behind the boiler. It is necessary to include a bypass of baghouse which is active during the boiler startup, before it approaches the target temperature. Bypass is important to prevent vapour condensation occuring when exposed to the low temperature of the flue gases.

Parameters of the baghouse

Baghouse units in the GIDLY catalog are fabric filter units equipped with automatic regeneration of bags by a reverse pulse jet technology. From our experience of individual extraction applications, the lifetime of the filter media lasts for more than 20,000 hours without the need of any manual refinement. The filter media are flat smooth fabric sleeves made of non-woven fabric with an antistatic coating and an area mass of 600 grams per square meter and a temperature resistance for up to 200° Celsius. The filter medium does not contain folds where the dust be sedimented and is very mechanically resistant to tearing or scraping. The amount of residual dust particles ranges from 5 mg/m3 do 10 mg/m3.

Recommended ducting solution

We recommend using Group III Ducting – a thick-walled, welded ducting. It is possible to use a pipe with a surface finish of chemical and thermal resistant insulating paints.

Baghouse units for boiler dust extraction in the GIDLY catalog

To find a specific assembly of the baghouse and fan, please go to the catalog and price list page. Select Baghouse units. From the list select „Solid fuel boiler dedusting“. Choose the required volumetric airflow value in the next step – marked in QV [m3/h] at t= 150°C . The result will be a set of components – baghouse + thermal insulation of the housing + thermal insulation and heating of the hopper + surface finish + stainless parts – fan – which all together result in the dedusting system. You can then insert the products in your costing.

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