CS238756B1 - Powdering equipment with air - Google Patents

Abstract

A device for mixing powder with air, where the air chamber with the air supply and the mixture discharge pipe is connected by an opening to the main chamber, which contains the powder supply and a tube, wherein a blade is inserted into the tube, which is terminated at the inserted end by a blind and at the protruding end by a closure. The device can be used not only where the resulting mixture (coal powder and air) is introduced into the relevant device, but also in other fields, such as in agriculture for mixing grains with air before subsequent transport of the mixture or in cement and lime works for mixing cement or lime powder before subsequent transport of the mixture.

Description

(54) Powder-dropping device with air

Powder-air mixing device, wherein the air inlet and the air outlet duct is connected through an aperture to the main chamber containing the powder inlet and the pipe, with a paddle inserted into the pipe, ending with blanking at the retracted end and . The equipment can be used only where the resulting mixture (coal powder and air) is introduced into the respective equipment, but also in other fields, such as in agriculture to mix grain with air before subsequent transport of the mixture or in cement and limestone to mix cement or lime powder before the subsequent transport of the mixture.

Fig. 1

The invention relates to a device for mixing powder (eg coal) with air with the possibility of both taking a sample of the powder and blowing out the powder which clogs the device by means of additional air.

Currently, the powder is mixed with air in two main ways. The first method consists in pouring the powder into an air stream which can have an eject effect on the powder. The disadvantage of the first method is that the device is disabled if the air flow is clogged with powder in the main chamber of the device. In the second way, the powder is sucked out of the main chamber of the mixing device by an air stream. When the main chamber is clogged with powder, the air flow is uninterrupted and, if the powder is not packed in the main chamber, it can be sucked off gradually.

The above-mentioned disadvantages largely eliminate the powder-air mixing device according to the invention, which consists in that it consists of an air chamber with an air inlet and an exhaust duct which is connected through an opening to the main chamber containing the powder inlet and the tube, the blade is retracted, terminated at the inserted end by blinding and at the protruding end by the closure.

The device according to the invention starting from the second mixing method, where the powder is sucked out of the main chamber of the mixing device, actually improves the possibility of gradually aspirating the powder by introducing additional air into the main chamber of the device. In this case, the supply of additional air may also serve as a powder sampling probe.

An example of an embodiment of the device according to the invention is shown in the accompanying drawings, in which Fig. 1 shows an embodiment of the device at a position of a vane suitable for taking a powder sample and Fig.

The apparatus consists of an air chamber 1 with an air inlet 2 and a discharge duct 6, a main chamber 6 with a powder inlet 6 and a tube 6, a connecting hole 8 and a vane 8 with a cap 6. The energy of the air entering through the air inlet 2 into the air chamber 1 creates a velocity gradient at the inlet edge of the mixture outlet pipe 5, causing a local pressure drop, thereby inducing suction of the powder through the through opening 6 of the main chamber 6 ( 1) into the discharge line (4) of the air / powder mixture thus formed.

The tube 6 in the main chamber 6 is provided with a certain length of upper and lower cut-outs.

The blade 8 is tubular, blinded at one end and provided with a cap at the other end.

If the blade 8 is inserted into the tube 8 (FIG. 1) such that the cutout of the flap 8 with the closed cap 8 is below the upper slot of the tube 8, then the filled blade can be ejected to remove powder which gradually fills it over the overlapping cutouts in tube e scoop. If the blade 8 is inserted into the tube 8 (FIG. 2) such that the slot of the blade 8 with the open closure 8 is above the lower slot of the tube 8, then the additional air flowing into the blade 8 can continue to flow through the slots on the blade and the tube. main chamber 6, where it improves the conditions for aspirating powder from the chamber. In addition to the two depicted positions of the vane 8 in the tube 8, the vane 8 can be pulled completely out of the tube 8 and the connection opening 4 or the mixture discharge line 4 is cleaned through the inside of the tube.

The device according to the invention can be used, in particular, for mixing coal powder with air, whereby the resulting mixture is fed to a respective coal powder combustion plant. However, it can also be used in other fields where air is mixed with solid particles - for example, in agriculture, grain is mixed with air before subsequent transport of the mixture or in cement and lime plants to mix cement or lime powder before subsequent transport of the mixture.

Claims (3)

OBJECT OF THE INVENTION Apparatus for mixing powder with air, characterized in that it consists of an air chamber (1) with an air inlet (2) and with an outlet duct (3) which communicates through a bore (4) with a main chamber (5) containing an inlet (6) a powder and a tube (7), wherein a vane (8) is inserted into the tube (7), terminated at the pushed end by a blanking and at the protruding end by a closure (9). Device according to claim 1, characterized in that the blade (8) inserted into the tube (7) has a blade slot (8) with a closed cap (9) below the upper slot of the tube (7). Device according to claim 1, characterized in that the vane (8) is inserted into the tube (7) such that the vane opening (8) with the open cap (9) at the protruding end is above the lower slot of the tube (7).