DE1905106A1 - Method and device for separating bulk material transported by means of a conveying gas flow into a coarse and a fine fraction - Google Patents

Description

FAPvBENFABRiICEN BAYER AG

LEVE RKU S EN-Bayerwerk Patent Department! 51. Jan. 'I $ 69

Mr / cook.

Method and device for separating a gas stream by means of a conveying gas stream transported bulk goods into a coarse and a

Torment

The present invention is directed to a method and eiae Device for separating a bulk material transported by means of a conveying gas stream into a coarse and a fine fraction, wherein The device is based on one consisting of a bulk material feed device and a conveying gas source from which a common delivery line leads away. {

For separating bulk material guided in a gas stream according to grain size various devices are known. The simplest execution form is the cyclone separator; other dividers are air separators, vortex separators and step cyclone separators,

The disadvantage of this classifier is that it is very complicated and bulky Construction. Similar to the cyclone separator, the classifiers also form at higher loads of the conveying gas flow with bulk material so-called strands, which are particularly evident in sticky bulk goods do not dissolve again. Even with free-flowing dusts that do not tend to stick together, it occurs in the aforementioned

Sifters due to the formation of strands locally lead to very high bulk material concentrations. This makes the separation sharpness of the classifier essential degraded.

The object of the invention is to provide a very simple method and a To provide apparatus that has the disadvantages of the above known Avoids separating devices.

In terms of process technology, this is achieved in that the Deflection of the conveying gas flow separated bulk material by means of a separating gas flow opposing the conveying gas flow into coarse and fine fraction is separated, the coarse fraction being deposited by its mass inertia force, while the fine fraction with the unifying conveying gas and separating gas stream is discharged.

It is thereby achieved that the conveying gas flow is stabilized by the separating gas flow, in particular in the area of the deflection. In addition, in this area the from the conveying gas flow at the Deflection of separated bulk material particles is braked to a greater or lesser extent according to their grain size. At constant speed of the separating gas flow, larger good particles penetrate deeper into the countercurrent as a small one. The length of the separation gas flow path can be determined so that particles from a certain grain size penetrate the braking strength formed in this way and fall into a collecting container. The fine fraction is carried away by the flow of conveying gas, or the larger particles of the fines are removed from the separating gas flow braked to a standstill and discharged together with the flow of conveying gas after the separation of the gas flow.

This method has proven particularly suitable for intent of coarse fractions below $ 1 from fine material that tends to adhere.

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00 98 3 4/0981

Mach. "A special embodiment of the method is the limit grain diameter by choosing the ratio of the gas flow rate to Irenngas volume set per unit of time. That way it can Procedure for a desired limit grain diameter can be set.

The conveying gas flow is preferably deflected by 180 °. At this Measure, good results have been achieved in particular with strongly adhesive bulk materials.

The device according to the invention for carrying out the method is characterized in that the delivery line into a chamber opens, which has a gas vent and is extended beyond the mouth of the delivery line and into a collecting container opens, which is provided with a gas inlet nozzle and a coarse material outlet nozzle. According to a particular embodiment of the Device is on the outside of the mouth of the delivery line; a Deflection bead arranged. The degree of separation is determined by this deflecting bead and the separation effect is improved. According to a further advantageous embodiment of the device which improves the effect, a displacement body is arranged in the mouth of the delivery line. It is designed like a torpedo, for example, provided that the Delivery line or its mouth has a circular cross-section having. '.

In order to be able to set the limit grain diameter on the device, the invention preferably provides that in the gas inlet port of the collecting container, a throttle element, for example a throttle valve, is arranged. The sees a further adjustment option Invention preferably before; tfäß die Müridüttg ^ aer FBraerleiturig IH - "/ ' their distance to the collecting container is adjustable. By this measure is the one acting on the separated bulk material The power of the potable gas flow is variable and adjustable.

- 3--0 0 9 8 3 4/0951 ORfQfWAi. INSPECTED

With the aid of a drawing, the essence of the invention will now be based on two exemplary embodiments explained in more detail, namely show:

Figure 1 shows a device with a tubular conveying line and circular Mouth and

FIG. 2 shows a delivery line, the mouth of which represents a deflecting wall.

In B'igur 1, the suction fan 1 simultaneously serves as a conveying gas and separating gas source. By means of Schüttguczuführvorrichtung 2 wire, the bulk material in the through Förderleitu 'ig' $ flowing Fördergäs · - current introduced A diaphragm 4 provides a resolution of possibly on the wall of the conveyor line J5 transported Profilstrahnen The schuttgutbeladene Fördergaästrom then happens.. "The rectifier plates 5 and flows around a displacement body 18 arranged in the opening "o" of the feed line 3. When it emerges from the opening 6, the conveying gas flow is deflected and flows around a bead J arranged on the outside of the opening 6. The feed line 3 is surrounded by a chamber 8 designed as a tube. This is extended downward beyond the mouth 6 of the delivery line and connected to the collecting container 9. The separated coarse fraction of the bulk material collects in the collecting container 9 and is removed through the coarse material outlet nozzle 10, which is provided with a closure flap 11. In the upper region of the collecting container, a gas inlet connection 12 is arranged, in which a throttle element 1 ^ is provided. Through this inlet port 12. a separating gas flow occurs, which is deflected at the transition from the collecting container 9 into the chamber δ in such a way that it is directed in the opposite direction to the incoming conveying gas flow. It is discharged together with this through the annular chamber 8 and fed via a connecting line 14 together with the fine fraction of the bulk material to a cyclone separator 15, which frees the gas stream from this fine fraction, the fine fraction being in the collecting container

BATH ORIGINAL

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16 collects j during the gas flow through the; Immersion tube I7 via the Suction fan 1 leaves the cyclone separator 15.

In FIG. 2 is ", a simplified embodiment of the device without a switched cyclone separator. The bulk material is fed into the conveying line via the bulk material feed device 21. The bulk material-laden conveying gas flow is deflected 25 ° by 180 ° at the end of the baffle. Below the .. B'örderleitung includes a chamber 2k, which is connected to a collecting container 25. the collecting container 25 has clip a Grobgutauslaß- λ 26 au:?, which is provided with a discharge valve 27, the separation gas stream passes through the gas inlet port 28 in the. a throttle valve 29 is provided, and flows into the chamber 24, whereby the coarse fraction through this separating gas flow, which is opposite to the incoming conveying gas flow, drops downwards through the inertia force acting on it, while the braked fine fraction via an outlet line 30 together with the Conveying and separating gas flow the device ve leaves. The partition wall 2j5 has a height-adjustable sheet metal 51 at its mouth, with which the actual deflecting edge can be adjusted with regard to its distance from the collecting container. The mouth of the delivery line 22 is designated by 32.

'. '"-5-0 0 9834/0961 ^ßAD

Claims (8)

Patent claims: f \ ■ ' 111. A method for separating a mitcels a Fordergasstromes transported bulk material into a coarse and a fine fraction, * wherein the Pördergasstrom at least 90 ^O: is umgelenkt-, characterized in that the thereby deposited bulk material by means of the ankommenden.Fördergasstram opposing separation gas flow into coarse and fine fraction is separated, the coarse fraction being separated by its j. Inertia force is deposited., While the fine fraction is discharged with the unifying conveying gas and separating gas stream. 2. The method according to claim 1, characterized in that the Limit grain diameter by choosing the ratio of the conveying gas quantity. is set to the amount of separating gas per unit of time. j>. ' Method according to Claims 1 and 2, characterized in that the conveying gas flow is deflected by 180 °. 4, device for carrying out the process, consisting of a bulk material feed device and a conveying gas source, from which a common conveying line leads away, characterized in that the conveying line (J, - 22) opens into a chamber (8, 24) which has an outlet line ( 14, J> 0) and is extended beyond the mouth (6, J> 2) of the delivery line (3, 22), and opens into a collecting container (9, 25) which has a gas inlet nozzle (12, 28) and a Grobgutauslaßstutzen (10, 26) is provided. 5 · Device according to claim 4, characterized in that an the outside of the mouth of the delivery line (3) has a deflecting bead (7) is arranged. - 6 - ': ^; 00.9.834 / 0951 ^: - ORIGINAL BATHROOM 6. Apparatus according to claim 4 and o, characterized in that a displacement body (18) is arranged in the mouth (6) of the delivery line (J). · 7. Apparatus according to claim 4 to 6, characterized in that a throttle element (1j5,29) is arranged in the gas inlet connection (12,28) of the collecting container (9,25). 8. Apparatus according to claim 4 to ¹ J, characterized in that that the mouth (32) of the delivery line (22). is adjustable in its distance to the * collecting container (25). , Le A 12 034 - 7> 00983 ^ / 0951 Lee back side