SU1283245A1 - Method of automatic control of process of draining water from reservoirs and settlers for storage of petroleum products - Google Patents

Abstract

The invention relates to a method for automatically regulating the process of draining water from tanks, can be used in the oil-producing and oil-refining industries and eliminates the ingress of oil into the drainage water. The method is implemented by a system that includes a petroleum-water-phase interface control circuit depending on the composition of the liquid medium at a given phase separation level in the remote vessel 1 by changing the water discharge, sensors 2, 3, unit 4 comparisons, controller 6, actuator 7 water discharges from tank 9 and, depending on the flow rate of the gas-vapor mixture, flow sensor 5. 1 ill., 1 tab. with s

Description

Yu

00

with N N SP

- //

The invention relates to a technique for automatically regulating the process of draining water from storage tanks for petroleum products and can be used in the oil producing and refining industries.

The purpose of the invention is to prevent the ingress of oil into the drainage water.

The drawing shows a block diagram of an apparatus for implementing a method for automatically regulating the process of draining water from tanks and sumps for storing petroleum products,

The device contains a remote vessel 15 gauges 2 and 3 of gas (oxygen, nitrogen), respectively, on the supply lines to the gas space of the vessel

him In the case of flow control, the signal from the gas meter (flow meter) 5 enters comparison unit 4, where it is compared with the initial flow rate of the inert gas or air sludge.

In case of oil getting into the remote vessel 1, it evaporates and carries away air from the surface. Gas meter 3 (oxygen, nitrogen) registers the reduction of gas (nitrogen oxygen) in the outgoing gas-vapor mixture. Comparison unit 4 compares the initial and final content of gas (oxygen, nitrogen) in the gas-vapor mixture and sends a signal to the regulator which produces a control action on the actuator

ten

15

inert gas or air and on the face- 20 7 to the valve 8 to reduce the flow

j

832452

him In the case of flow control, the signal from the gas meter (flow meter) 5 enters comparison unit 4, where it is compared with the initial flow rate of inert gas or air.

If the oil product gets into the remote vessel 1, it evaporates and carries away air from the surface. Gas meter 3 (oxygen, nitrogen) registers the reduction of gas (oxygen, nitrogen) in the outgoing gas-vapor mixture. Comparison unit 4 compares the initial and final content of gas (oxygen, nitrogen) in the gas-vapor mixture and sends a signal to controller 6, which produces a control action on the actuator

ten

15

Research institute of the outgoing mixture, unit 4 of comparison j gas meter (flow meter) 5 regulator 6, the input of which is connected with the output of unit 4 of comparison, executive body 7, valve 8, connected with the output of regulator 6, tank 9 connected by pipeline 10 with a portable vessel 1 and a pipe 11 with a water seal, connecting the water discharge pipe 12 and the reservoir 9 and the portable vessel 1.

The method of regulating the process of draining water from tanks and sumps is as follows.

The oil-water-liquid medium in the tank 9 at a predetermined height H of the phase separation through pipeline 10 flows continuously into the external vessel 1 and flows through the pipeline 11 into the water discharge pipeline 12. The liquid medium entering the vessel 1 is blown with inert gas or air through an inert gas 2 gas meter (oxygen, nitrogen) with constant flow. As a result of the mass exchange, the inert gas or air is saturated with vapor of the medium being drained and analyzed according to

change of gas concentration to measure 50 of the reservoir 9. Similarly to the gas operator 3 (oxygen, nitrogen) and the flow meter 5 (gas to change the gas flow in the gas meter, flow meter). Caught in the meter (flow meter) 5. The signal vessel of the oil product is drained from the meters 2 and 3 and enters us with water into the drain pipe 12 of the comparison unit 4, which compares the 55 P pipe 11, providing

constant level in the remote suction

The table shows examples illustrating the ability to regulate the change in the content of gas (oxygen, nitrogen) in an inert gas or air supplied to the gas space of vessel 1 and exiting

0

five

drainage water or complete cessation of drainage of water from the tank 9.

In the case of flow control, the gas meter (flow meter) 5 sends a signal to the comparison unit 4, which compares the initial and final costs, and also generates a control action through the actuator 7 on the valve 8.

When the oil product-water phase separation level is higher than what is specified in the remote vessel 1, only the produced water is located and, consequently, the 2 and Zgaz meters (oxygen, nitrogen) will show close values of gas (oxygen, nitrogen) in the inert gas or air supplied to the vessel 1 leaving it (the value of the pressure of saturated water vapor can be neglected). Block 4 compares the signals from oxygen (nitrogen) meters 2 and 3, 5 sends a signal to regulator 6, which in turn produces a controlling action on the actuator 7 and valve 8, to increase the drainage water flow

0

Vani on this method. These results were obtained when water with a different content of oil product was supplied to the remote vessel 1 and under the following conditions: the volume of the remote vessel is 1000 ml, the drainage level of the liquid is 2/3 of the height of the remote vessel, the flow rate of the liquid supplied to the portable vessel is 650 ml / min, the flow rate the air supplied to the gas space of the remote vessel, 70 ml / min, the temperature of the liquid in the remote vessel was 19 ° C, the air temperature was 20 ° C, the inlet air flow rate and the vapor-gas mixture at the outlet were determined by a foam flow meter, the oxygen concentration The air inlet and in the vapor – gas mixture at the outlet were determined by gas chromatography.

As can be seen from the table, in the presence of petroleum in the drained water, an increase in the volume of the vapor – gas mixture occurs, which comes out of an external vessel as compared with the volume of air supplied to the gas space of the vessel, as well as a decrease in gas

Consumption, ml / min 7070.6

Concentration

0% by volume 20.8 20.6

JO

 keeping the volume concentration of oxygen in the same mixture compared to its content in the supply air.

Claims (1)

Invention Formula A method of automatically controlling the process of draining water from tanks and settlers for storing petroleum products, which consists in maintaining a given level of oil-water phase separation by affecting water discharge depending on the composition of the liquid medium at a given level of phase separation in a portable vessel, which is different. By the fact that, in order to prevent oil from entering the drainage water, additionally an inert gas or air is supplied with a constant flow to the gas space of the remote vessel and regulate the discharge of water depending on the flow rate of the vapor-gas mixture or the concentration of gas in the vapor-gas mixture outgoing from vessel. 15 20 70 84.1 70 85.7 20.8 16.6 20.8 16.1