As shown in Figs. 183 and 184, the Brassert-Witting whirler consists of a vertical outer cylindrical casing, A, and an inner inverted tube, B, which at its upper end is integral with the gas main C, which takes the cleaned gas away from the apparatus. This inverted tube is flared at its lower end, D; a number of iron or steel bars, E, are fastened vertically around the chamber F and extend from a point well above the lower edge of the flared end D of the pipe to a point well below the lower edge of this pipe. In the lower part of the chamber F is placed a cone, G, which allows the separated dust to enter the outlet pipe.

Figs. 183, 184. Vertical and horizontal sections of Brassert-Witting whirler.

"The gas enters the apparatus tangentially through the flue H and is given a rotary whirling motion through the annular space between the pipe B and the wall of the chamber A. On coming in contact with the bars E the dust is caught in the channels between these bars and is held in position by the combined action of centrifugal force and friction. As the gas continues to rotate within the annular spaces above mentioned, its velocity is gradually increased by the action of the flared end of the receiving pipe until when it reaches the lower edge of the end its velocity is at a maximum. On passing below this edge, the velocity is constantly decreased, the direction of the gas is changed and it passes upwardly through the flared end of the pipe to the outgoing gas main C.

"The dust which has been caught in the channels between the baffle bars drops vertically into the bottom of the chamber, past the cone G and into the outlet pipe, whence it is removed as desired.

Brassert Modifications Of Brassert-Witting Whirler

In the Brassert modifications of the Brassert-Witting whirler, a sketch of which is shown in Fig. 185, the lower portion of E of the casing is larger in diameter than the upper portion B and is provided with a series of inwardly projecting baffle plates, F. The lower portion G of the casing E is cone-shaped and constitutes the dust-receiving chamber. In the bottom of this chamber is a cone, H, whose function is to direct the dust toward the periphery of the dust outlet pipe. Within the chamber I another cone, J, is located and this cone is provided with a aeries of baffles, which are arranged as shown in Fig. 186.

Horizontal Section on line 4-4:

Figs. 185, 186. Vertical and horizontal sections of Brassert modification of Brassert-Witting whirler.

"In Fig. 187, which is a further modification, a spiral, L, is provided for the purpose of directing the flow of the gas. The lower end of the outlet pipe is made barrel-shaped. The outer casing M in its lower portion N is supplied with the baffles 0, which instead of being mounted on the casing are bent inwardly therefrom, thus forming the apertures P (Fig. 188). The section N of the casing is inclosed by an outer casing, Q, thus forming the annular chamber R, in which partitions S are placed to prevent whirling of the gas in this annular chamber.

"The gas is introduced and discharged and the dust is separated in a similar manner to that mentioned in the description of the Brassert-Witting whirler.