Baghouse failures

L, Theodore and J, Reynolds, Effect of Baghouse Failure and Baghouse Outlet Loading, J, Air... 

Direct water spray cooling must be carried out with care. The spray chamber must be designed to ensure complete evaporation of all Hquid droplets before the gas enters the baghouse. Spray impinging on the chamber walls can result ia a dust mud iaside the chamber and any increase ia gas dewpoint may result in baghouse problems or atmospheric plume condensation. Spray nozzle wear can result in coarse or distorted spray and wetted bags, and water pressure failure can cause high temperature bag deterioration. 

For a detailed development of tlie above equation, refer to Effect of Bag Failure on Baghouse Outlet Loading, L. Tlieodore and J. Reynolds, JAPCA, August 1979, 870-2. 

If T is tlie failure of a bag in a baghouse in 50 days with standard deviation 1.0,... 

Thermal desorption units can experience treatment failures when contaminant condensation occurs inside the baghouse. According to the vendor, the ConTeck system minimizes, but does not yet completely eliminate, this problem. 

The effect of bag failure on baghouse efficiency can be described by the following equations ... 

It is important to note that each bag in a set may have a different life as a result of fabric quality, bag manufacturing tolerances, location in the collector, and variation in the bag cleaning mechanism. Any one or a combination of these factors can cause bags to fail. This means that a baghouse will experience a series of intermittent bag failures until the failure rate requires total bag replacement. Typically, a few bags will fail initially or after a short period of operation due to installation damage or manufacturing defects. The failure rate should then remain very low until the... 

The baghouse problem appears to be bag failure. Note that the effieiency drops below 90% after just 2 months. 

The annual probability of failure of the baghouse provided by Company A is 1/10 = 0.10, while that of Company B is 1/45 = 0.022. With these results, the estimated annual cost of each of the baghouse options can be determined as follows ... 

The key to baghouse maintenance is the frequent and routine inspection of the filter bags. All bag units have a finite lifetime. Typical causes of bag failure are [42] ... 

Table 12.1 lists the common failure modes for baghouses. This guide may be used for all such units that use fabric filter bags as the primary dust-collection media. 

Baghouse filters are intended to separate and retain the fly ash particles contained in the off-gas at relatively low temperatures. The off-gas expands in a filter chamber and passes through the fabric filter bags. The fly ash is collected on the surface of the filter bags. To prevent failures of the filter material, the temperatures and the gas flows should be limited to the values specified by the filter manufacturer. 

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