Abstract
In order to study the effect of venturi structures on the cleaning performance of a pulse jet baghouse, several cleaning tests are carried out applying the pulse jet test bench. Experiments are performed using different filter bags with venturi tubes of varying throat diameters and lengths. Peak pressure and peak pressure arrival time are selected to evaluate the cleaning efficiency under different conditions. On this basis, a series of comparative experiments are conducted between a typical venturi-type and a new venturi tube design on a semi-industrial pulse jet baghouse. The effects of the new venturi-type on baghouse cleaning performance and dust emission are studied. The results show that pulsing air pressure has a significant effect on bag-cleaning performance; the larger the throat diameter and the shorter the venturi length, the higher the peak pressure and the shorter the peak pressure arrival time. This improves the cleaning efficiency of the filter bags. The new venturi design changes the distribution of the cleaning pressure in the vicinity of the bag mouth, effectively extending the cleaning cycle and reducing the energy consumption as well as reducing the dust emission concentration of the baghouse.
Highlights
The baghouse is a high-efficiency dust removal device widely used in the treatment of pollutants present in industrial flue gases
This paper reports on the effect of different lengths and throat diameters of venturi tubes on the cleaning performance of long filter bags (8000 mm)
Where Fd is the separation force per unit area when the dust cake is separated from the filter bag, N; mc is the mass of the dust cake present on the filter bag surface per unit area, kg; m is the sum of the filter material and dust cake masses per unit area, kg; K is the elastic coefficient of the filter bag; Ppk is the peak pressure of the cleaning airflow on the side wall of the filter bag, Pa; D is the free displacement of the filter material and dust cake, m; and tR is the peak pressure arrival time, s
Summary
The baghouse is a high-efficiency dust removal device widely used in the treatment of pollutants present in industrial flue gases. In these types of operations, particulate matter in the dust-laden flue gas is filtered and trapped by the filter bags, and a dust cake is deposited on the surface of the filter bag. Pulse jet cleaning usually uses compressed air, which is injected into the filter bag through the bag mouth with an instant release mode. The dust cake falls off from the surface of the filter bag under the combined action of primary compressed air and secondary airflow, achieving the purpose of the bag cleaning [5,6,7]
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