SU1242213A1 - Arrangement for automatic control of multisectional bag filter - Google Patents

Description

The invention relates to automation devices controlling multisectional bag filters and can be used in filtering installations of gas cleaning devices in ferrous and nonferrous metallurgy and other industries.

The purpose of the invention is to increase the reliability of the bag filter.

FIG. 1 is a schematic diagram of an automatic control device for operation of a bag filter using the limit switch of the position of the pneumatic cylinder of the purge valve; in fig. 2 is an electrical circuit diagram of the implementation of the filter control unit using the end position switch of the purge valve; in fig. 3 — centrifugal fan and network characteristics.

The control unit using the end switch of the purge valve (Fig. 1) contains a return purge pipeline 1, a purge fan 2, a bypass pipeline 3, a shut-off valve 4 of the bypass pipeline 3, a purge manifold 5, a pneumatic cylinder 6 of the purge valve, a valve plate 7 purge, intermediate chamber 8, seats 9 of blowdown valves and clean gas, clean gas manifold 10, clean gas valve plate 11, clean gas valve pneumatic cylinder 12, limit switch lever 13, outlet pipe 14 clean gas, purge gas nozzle 15, clean gas filter chamber 16, filter sleeves 17, filter housing 18, filter hopper 19, dusty gas collector 20, dust gas nozzle 21, shut-off valve motor 22 bypass pipe 3, electrical contact 23 positions of the purge valve "Closed, electrical contact 24 of the position of the purge valve" Open, filter control unit 25 and air distributors 26.

The control unit (Fig. 2) contains the time relay KT1, KT2 and KTZ, electromagnets UA1 and UA2 of the air distributors of the pneumatic cylinder of the purified gas valve and the pneumatic cylinder of the purge valve, the relay of the RZ and PO of the motor control of the shut-off valve on the bypass pipeline, contacts KPK1 and KPK2 of the end switch of the purge valve and contacts of KZ and KO of the final switch of the electric motor of the shut-off valve of the bypass pipeline.

The control unit using the end position switch of the purge valve operates as follows.

In filtering mode, the plate 11 (Fig. 1) is lowered down, and the gas from the collector 20 of dusty gas, purified from dust in the sleeves 17, through the prom: daily

chamber 8 enters the manifold 10 of the purified gas and is removed from the filter through the pipe 14. During this period, the plate 7 is in the lower position, the purge valve is closed and the limit switch lever 13 in this position supports the shut-off valve 4 through its electric motor 22 in the "Open" position. At the same time through the bypass pipeline 3 passes the gas from the purge fan 2.

During this period, in accordance with the falling characteristic of the fan (Fig. 3), the operating point is in the Ag position, at which the gas flow rate Oz is increased, and the pressure PZ is lower and corresponds to the flow resistance of the bypass pipeline 3.

The filtration period ends by closing (when the pneumatic cylinder 12 triggers after a specified period of time) the clean gas valve, while the plate 11 presses against the saddle 9. After a pause when the shut-off valve 4 is open, the pneumatic cylinder 6 opens from the distributor 26 and opens the purge valve. Plate 7 moves upwards. The reduced pressure drop across it allows for less force to open it. When the plate 7 reaches the upper position, the upper electrical contact 24 of the limit switch is triggered, and using the electric motor 22, the shut-off valve 4 is set to the "Closed" position, the bypass conduit 3 is closed. Purge gas is supplied through the pipe 15 to the filter section. Closing the shut-off valve 4 allows the performance of the purge fan 2 to be shifted to the position Ai, corresponding to the pressure P (Fig. 3) necessary to overcome the flow resistance of the sleeves and the filter housing, and a predetermined flow rate for reverse blowdown. The purge gas through the collector 5, the intermediate chamber 8 and the clean gas chamber 16 of the filter section passes through the sleeves 17 in the opposite direction of filtration and, dumping the collected dust from the sleeves into the hopper 19, directs the E5 collector 20 of dusty gas.

The purge period ends after a predetermined period of time. At the command of the control unit 25, the plate 7 goes down and presses against the seat 9. At this point, the electrical contact 23 of the limit switch is closed and the shut-off valve 4 switches to the "Open" position. At the same time, the operating point of the characteristic of the purge fan 2 is again moved to position A (Fig. 3). Then, after a pause, the valve of the purified gas opens and the filter section returns to the filtration mode, etc.

The frequency of the elements of the system is provided by the control unit

(Fig. 2). The pause before the purge gas valve is turned on and the time during which the valve remains open is maintained for the time-based CT relay. The electromagnet UA1 of the air distributor 26 control AU2 of the air distributor 26 gives a signal to start the opening of the purge valve. The duration of the purge is monitored by the time relay KT2. Contacts KPK1 and KPK2 fix the valve position

By means of a pneumatic cylinder 12 of the valve of the purge- 5 purge, respectively, “Open and” of the ZaN gas Relay KT1 through the electromagnet is covered.

The UA2 diffuser 26 signals the start of the opening of the purge valve. The duration of the purge is monitored by the time relay KT2. Contacts KPK1 and KPK2 fix the valve position

 purges respectively “Open and“ Closed.

FIG. g

Editor O. Golovach Order 3642/1 1

Sostavite.py E. Skl rsky

Tehred I. Veres Corrector A. Zimokosov

Circulation 663 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (1)

AUTOMATIC CONTROL DEVICE FOR MULTI-SECTIONAL HOSE FILTER, comprising a purge fan with a purge pipe, a section with purge and purified gas valves associated with pneumatic cylinders, and a control unit, the inputs and outputs of which are connected through air distributors with pneumatic cylinders, characterized in that bag filter operation, the device further comprises a bypass pipe connected to the inlet and outlet of the purge fan, and a shut-off valve with an electric motor, installed on the bypass pipe, while the valve section further comprises a purge valve position switch connected to the inputs of the control unit, the output of which is connected to the bypass pipe shut-off valve motor. Fig / to 4 ^ GO GO With