SU402686A1 - ABOUT ISAI INVENTIONS402686 - Google Patents

Description

one

The proposed device relates to the field of automation of technological processes and is intended, in particular, for the automatic removal of liquids from apparatus operating under excessive gas pressure.

Devices are known that contain shut-off valves on the lines for draining liquids from apparatuses, discrete sensors for the specific gravity of liquids installed in a separation tank, a pressure relay installed on the line for draining liquids from separators, signaling devices for limiting values of liquid levels in apparatus and pressure regulators.

Their disadvantages are poor separation of the mixture of liquids and low reliability in operation.

In order to ensure high-quality separation of the mixture of liquids and increase the reliability of the proposed device for automatic control of the process of separation of liquids, the specific gravity sensor of the lighter liquid is located in the separation tank on the same level as the specific gravity sensor of the heavier liquid. The output of the lighter fluid sensor is connected to a relay controlling the separator shut-off valves. The sensor output of a heavier fluid is connected to a relay that controls the shut-off valves for heavy drain and more.

light liquids from the separation tank. The output of the pressure relay is connected directly to the relay inhibit chamber, which sends commands to the relay that controls the drain valve.

liquids from separators.

The scheme of the proposed device is shown in the drawing. The device contains a specific gravity sensor more heavy liquid 1 and a specific gravity sensor of a lighter liquid.

2 installed at the same level in the separation tank 3. Sensor 1 output is connected via the Pnx input to the check valve 4 output and through an adjustable throttle 5 to the control camera of the relay 6, the relay inhibit chamber 7, with the pneumatic capacity 8, the pressure gauge 9 and the check valve inlet 4, and through an adjustable choke 10 with normally-closed (n.z.) relay contacts 6, 7, 11 and through a filter 12 to the power supply line of the DCF-A sensor 2 output is connected via the PBX input to the control camera of the relay 7, camera prohibition of the relay 13, with the output of the check valve 14, the input of which is of the connections with the atmosphere through normalnootkryty (NO) contact of relay 6 and in a yield

Obviously, to a shut-off valve 15, located on the drain line of a heavier fluid, and to the inlet of the change-over valve 16, one outlet of which is connected to the control chamber of the relay 11, and the other outlet is connected to the atmosphere

through n.o. the contact of this relay with the control

camera and n.z. contact relay 13. Output Pout, connected to the valve drain the fluid from the separators, with a pressure gauge 17 and the atmosphere through the NO. contact of relay 13, and through adjustable throttle 18 with a vacuum capacity of 19, the camera closes the relay And the Rvhz input connected to the output of the sensor, a pressure relay, on the discharge line of the liquid from the separators to the separation tank. The outlet is connected to the actuator of the check valve 20 located on the discharge line of the lighter fluid, and to the atmosphere through n. about. relay contact 7.

The device works as follows.

After draining into the separation tank 3, the liquid level in it is located above the position of sensors 1 and 2. At the same time, the contacts of the sensors are closed. The supply agent (compressed air or combustible natural gas) from the RPIT line enters the control chamber of relay 6 and the elements connected to it.

When the pressure rises to a predetermined value (0.75 kgf / cm2), the 6 n relay triggers a control signal to the actuator of the shut-off valve 15, which opens and the discharge of the heavier liquid from the separation tank 3 starts. in the control chamber of the relay 6 depends on the setting of the adjustable throttle 10. After more liquid is drained, the contact of sensor I opens and the pressure from the control chamber of the relay 6 is released into the atmosphere. The time for depressurization depends on the setting of the adjustable throttle 5.

Further, the relay 6 returns to its original position. The control signal from the actuator of the check valve 15 is vented to the atmosphere through the NW. contact of relay 6. After that, relay 7 is activated and outputs a control signal to the actuator of the shut-off valve 20, which opens, and drainage of the lighter fluid remains. At the same time, relay 11 is activated and connects the power supply line of the TLMS with n. 3. contact and control chamber of relay 13. After draining the lighter fluid, the contact of sensor 2 opens and the pressure from the control chamber of relay 7 and the inhibit chamber of relay 13 is released into the atmosphere.

In this case, the relay 13 is triggered and outputs a control signal to the output of ROCK, associated with the actuators of the shut-off valves for draining the liquid from the separators. This control signal is removed when a signal arrives at

Rvhz input from the pressure switch located on the line of discharge of the liquid into the separation tank, or from the line DOWN. through the adjustable throttle 18 in case of pressure switch failure. Further operation of the device

repeats.

Subject invention

A device for automatic control of a liquid separation process, containing shut-off valves on liquid discharge lines from apparatus, discrete specific gravity sensors installed in a separation tank, a pressure switch installed on a line separating fluid from separators, devices for limiting liquid levels in apparatus and regulators pressure, characterized in that, in order to ensure high-quality separation of the mixture of liquids and

increase the reliability of the device, the sensor of the specific gravity of the lighter fluid is located in the separation tank on the same level as the sensor of the specific gravity of the heavier liquid, and the output of the sensor of the lighter liquid is connected to a relay controlling the shut-off valves of the separators, the output of the sensor is more severe connected to a relay controlling shut-off valves for unloading heavy and lighter liquids against a separation tank, and the output of the pressure relay is connected directly to the inhibit chamber of the relay supplying signals on the relay controlling the drain valve of l {liquids from the separators.

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