DE3240227A1 - DEVICE FOR HEAT PROTECTION OF FILTER UNITS - Google Patents

Description

HOFFM] ANN · ECTLE '& PARTNER

paVent-'und r'echtsanwälte '*

patent attorneys dipl.-ing. w. vain · dr. rer. nat. k. hoffmann - dipl-ing. w. lean

dipl.-ing. k. fdchsle · dr. rer. nat. b. hansen · dr. rer. nat. Ha. browns · dipl.-ins. k. gdrg

dipl.-ing. k. kohlmann · lawyer a. nice

• 3 ·

37 723 pe / er

Stavby siln.ic a zeleznic, närodni podnik, Prague (CSSR)

Device for thermal protection of filter units

.RAHELLASTRASSE 4 · D-8000 MÜNCHEN SI · TELEFON CO8S) 9UO87 ■ TELEX OS-2PeiB C ^PAT HE) · TELECOPIER 91 β3 5S

32A0227

• it ·

The invention relates to a device for thermal protection of filter units.

The device is for dust extraction systems for bitumen mixtures processing plants, where rock is heat-treated in hot air dryers, determined the exit The hot air dryer is followed by a cyclone separator, which is connected to the inlet by means of a hot air line the actual, a filter material, most often textile goods, containing filtration chamber is in communication.

A disadvantage of the previous systems of this type is that the thermal regime in front of the filter chamber is almost uncontrollable, so that the filter textile

τ 5 is exposed to damage, even combustion, as a result of overheating. This not only has the frustration the desired filter effect, but also contamination of the entire environment of such a dedusting system result. This contamination sometimes reaches such an intensity that that the system must be taken out of operation * This reduces the productivity of such a system to a considerable extent abc Alternatively, it is necessary to relocate such systems in sparsely populated areas, which in turn causes further complications. The burnt filter textile is of course devalued,

so that it has to be completely replaced, _etc.

Another disadvantage of the known systems of this type is that the thermotechnical regime in front of the filter chamber can practically not be influenced in such a way that damage to the filter chamber filling in the event of temperature fluctuations from hot air to be driven into the chamber is avoided, which in particular leads to an unexpected temperature increase in the air their exit from the hot air dryer loaded with the rock from the outside applies. The decisive factor here is the temperature of the gaseous medium (fluid) behind the cyclone separator and before it enters the filtration chamber _e

The present invention is intended to eliminate the preceding disadvantages of the prior art and it is based on the object of providing a device for the thermal protection of filter units, intended for dedusting systems, in particular for bitumen engineering processing plants, where rock is heat-treated in a hot air dryer, after its exit a by means of a Hot air line with the entry of a filter _{chamber containing a filter medium},} most often textile goods, containing a communicating cyclone separator is to be created «

According to the invention, this object is achieved in such a way that

at both ends of the hot air line - in the hot air flow direction - two distant thermometers and

BATH ORIGINAL

Although an inlet thermometer and a protective thermometer are installed, between which a protective valve is placed, the hot air line connecting to the inlet of the filtration chamber, the outlet of which is connected to a suction fan via a suction line and a suction valve, with one between the suction line and the hot air line closable short-path line is provided _o

According to a preferred embodiment of the invention an adjustable cooling connection opens into the hot air line for supplying outside air and to the electrical Outlets of the two thermometers is connected to an evaluation unit

The outlets of the evaluation unit are preferably located with a control unit in connection, the exits of which with at least some control elements in the

Device existing valves are coupled. 20th

At least one of the existing thermometers can be used with

a transmitter of measured values, i.e. of temperature information, be equipped.

An exemplary embodiment of the device according to the invention is also intended to be based on the attached schematic Drawing will be explained in more detail, where the following main units thereof are illustrated: a Hot air dryer 10, a cyclone separator 20, a filtration chamber 30, a chimney 40, a short path line 50, a cooling connection 60, an evaluation unit 70

BATH ORIGINAL

and a control unit 80 »

At one end of the hot air dryer 10 is a burner 11 with a fuel inlet 12 and at the other end a calming chamber 13 provided from this calming chamber 13, under which a rock requester 14 runs, an outlet line 15 goes out. This opens into the cyclone separator 20, at the outlet 21 of which a Hot air line 22 connected to the hot air line 22 a protection valve 25 is installed, after which the Line opened into the inlet of the filtration chamber 30 From this a suction line 31 runs out and sets continues its course via a suction valve 32 and a suction fan 33 into the chimney 40. The one described above The circuit can be found in the prior art. According to the invention, the device comprises above it In addition, an inlet thermometer 23 at the beginning of the hot air line 22 and a protective thermometer at the end of the same 24, which are coupled to the evaluation unit 70.

Furthermore, the short-path line 50 with a short-path valve is between the hot air line 22 and the suction line 31 51 and a short-travel plate 52 remotely controlled by the control unit 80 installed »That in the hot air line too 22 built-in protection valve 25 is actuated by the control unit 80. After the protection valve 25 -

in the direction of flow - opens into the hot air line 22_ der Cooling connection 60 with a cooling valve 61, its cooling plate 6? is also in the circuit of the control unit 80 »In the event of an unexpected failure of the Supply network, it is also possible to put the device into the hot air line according to the temperature specifications of the two 22 built-in thermometers 23 and 24 by hand to beta tigeno

At the beginning of the process, both valves 25 and 32 are open, while the short-path valve 51 is in the short-path line 50 is closed. The cooling valve 61 in the cooling connection 60 is also closed. The suction fan 33 is closed

always in progress.
15th

If the temperature of the fluid exceeds the am

Inlet thermometer 23 preset setpoint, enables it is the device according to the invention, the following alternative, mutually independent interventions to undertake:

A. Through the cooling connection 60 and the open cooling valve 61 - opened by the control unit 80 in FIG Dependence on the temperature at the inlet thermometer 23 - cool outside air is fed directly into the hot air line 22. Is this sucked in cool air for cooling the warm fluid flowing through the hot air line 22

BATH ORIGINAL

S-

sufficient, then the protective valve 25 remains open and the cooled fluid flows into the filter chamber 30 ₀

B. If, however, the cool air sucked in from the outside through the cooling connection 60 does not sufficiently cool the warm fluid in the hot air line 22 to the temperature suitable for the filter textile, the temperature of the fluid rises to the one preset in the evaluation unit 70 for the protective thermometer 24 Value - ie the critical temperature for the filter textile - and the control unit 80 shuts off the protective valve 25 _{or the like}

C- Simultaneously with the shut-off of the protection valve the short-way valve 51 opens in the short-way line 50o

The operations described above can - depending on the Intensity and duration - as required and according to the values determined by the evaluation unit 70 in be combined in a suitable manner, the decisive factors being the temperature and the temperature gradient

in the hot air line 22 are o
25th

In the evaluation unit 70 can possibly also

other factors influencing the operation of the entire system, such as temperature, pressure, air humidity, temperature in the hot air dryer 10 or the like get saved"

BATH ORIGINAL
QPM

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Claims (1)

3240727 Claims lo / device for heat protection of filtration units, ^w be true for dedusting particular of bituminous mixtures processed plants, where rock is heat-treated in a hot air dryer, mounted after its exit a means of a hot air duct to the inlet of a filtration medium, most commonly fabric containing filtering chamber communicating cyclone separator is,
characterized in that at both ends of the hot TO air line (22) - in hot air flow direction - two from each other remote thermometer, namely an inlet thermometer (23) and a protective thermometer (24) are installed, between which a protective valve (25) is attached is, wherein the hot air line (22) is connected to the inlet of the filter chamber (30), the outlet of which through a suction line (31) and a suction valve (32) with a suction fan (33) stands, with between the suction line (3D and the hot air line (22) a closable short-path line (50) is provided. Device according to claim 1, characterized in that A controllable cooling connection (60) for supplying outside air opened into the hot air line (22) BATH ORIGINAL -SL- 3c device according to claim 1, characterized in that that an evaluation unit (70) is connected to the electrical outlets of the two thermometers (23 and 24) is. 4. The device according to claim 1, characterized in that at the outlets of the evaluation unit (70) a ' Control unit (80) is connected, the outlets of which with at least some control elements in the device existing valves are connected. 5 «device according to claim 1, characterized in that that at least ± nes of the existing thermometers (23 resp. 24) is equipped with a transmitter of measured values.