RU2053537C1 - Apparatus for controlling liquid level - Google Patents

Abstract

FIELD: automatic control systems. SUBSTANCE: apparatus includes a separation vessel, in which liquid and gas are being separated. Upon achieving a predetermined liquid level, the float 5 raises, and with use of the shutter 7 closes air tanks 11, 12, interrupting air passing along these tanks from the compressor 8 to atmosphere. An excess pressure, had been created in the tank 11, opens the actuating mechanism 14, through which a part of liquid is being removed from the separation vessel 2. The float descends and with use of the shutter 7 opens communication between the tanks 11, 12, restoring air passing from the compressor 8 to atmosphere. Liquid again collects in the separation vessel 2. At air passing to atmosphere a condensate, had been formed, is being simultaneously removed. That eliminates using of means for preliminary air procession. The apparatus doesn't need a special adjustment and heating units. EFFECT: simplification of structure of the apparatus. 1 cl, 1 dwg

Description

 The invention relates to automatic control systems and can be used in the oil and gas industry, in installations for the preparation and processing of oil and gas.

A device for regulating a liquid level comprising a process vessel, a manifold for supplying a gas-liquid mixture, a pipe for removing gas and liquid, a buoy level gauge with a pneumatic transducer, a pneumatic static control device, the output signal of which is supplied to a pneumatic actuator and simultaneously to a secondary measuring device, which is the setpoint controller [1]
For devices that use a pneumatic control system, increased requirements are also imposed when it is set up in order to exclude the delay time between the level change and the control of the actuator. To ensure the operability of the buoy level gauge at low temperatures, it is necessary to use means of heating it, which is associated with an increase in costs. The use of pneumatic secondary devices requires special preparation of compressor air for moisture and oil vapor content. Failure to comply with these requirements leads to premature wear of the pneumatic control system and reduce the reliability of the device.

 The objective of the invention is the creation of a device for regulating fluid with a simple and reliable circuit that does not require special settings, heating means, as well as special means of air preparation.

 For this, a device for regulating the liquid level, including a separation tank with a float placed in it, a manifold for supplying a gas-liquid mixture, pipes for removing gas and liquid, and an actuator, are equipped with air tanks separated by a shutter connected by means of rods to the float, with one input from air tanks is connected by means of impulse tubes and a throttle to a compressor, and the output to an actuator, the other capacity being connected via an adjustable throttle to the atmosphere yep.

 A diagram of the proposed device is presented in the drawing.

 The device comprises a collector 1, a separation tank 2, having pipes 3 and 4 for removing gas and liquid, respectively. A float 5 is placed in the separation tank 2, connected by means of rod systems 6 to a damper 7 separating the air reservoirs 11 and 12. The inlet of the air reservoir 11 is connected through a throttle 9 and impulse pipes 10 to a compressor 8, and the output to an actuator 14. Air reservoir 12 connected through the throttle 13 to the atmosphere.

 A device for controlling the liquid level is as follows.

 According to the collector 1, the gas-liquid mixture is fed into the separation tank 2, where the liquid and gas are separated. Upon reaching a predetermined liquid level, the float 5 rises and through the rod system 6 turns the shutter 7, which closes the air tanks 11 and 12. At the same time, the air flow from the compressor 8 through the throttle 9 through the impulse tubes 10, through the tanks 11 and 12 and the adjustable throttle 13 is stopped in atmosphere. Air continues to flow into the container 11 from the compressor 8 and creates an excess pressure in it, which, acting on the actuator 14, opens it and part of the liquid is removed from the separation vessel 2 by means of the pipe 4. The float 5 is lowered and turned through the rod system 6 the shutter 7, opening the communication between the air tanks 11 and 12. At the same time, the air flow from the compressor 8 through the throttle 9, the impulse pipes 10, tanks 11 and 12 and the throttle 13 to the atmosphere resumes. The liquid again accumulates in the separation tank 2. The air tank 11 is performed commensurate in volume with the capacity of the actuator 14, providing control over the operation of its valve simultaneously with a change in the liquid level.

 Using the proposed system for the passage of air from the compressor into the atmosphere ensures the simultaneous removal of condensate that does not require special means of air preparation. Moreover, the device uses a mechanical control system for the actuator, which does not require special settings and heating means.

Claims (1)

 DEVICE FOR REGULATING A LIQUID LEVEL, including a technological tank with a sensitive element placed in it and an actuator, characterized in that it is equipped with air tanks separated by a shutter connected by means of a rod system to the sensitive element, while the input of one of the air tanks is connected by means of impulse tubes and a throttle with a compressor, and the output with an actuator, and the other capacity is connected via an adjustable throttle to the atmosphere.