SU1129223A1 - Method for automatically controlling water draining from tanks and settling tanks for storage of gasoline cuts - Google Patents

Abstract

METHOD AVTOMATICHESKOGH) MANAGING draining water from the reservoir and sump for STORAGE gasoline fraction, comprising maintaining a predetermined interface level value gasoline fractions - water impact on water discharge, differing ayuschiys in that, in order to reduce losses of gasoline fractions with the drainage water, measured the vapor pressure of a liquid medium at a given level of phase separation in a portable vessel at the temperature of the initial boiling point of gasoline fractions, and depending on the value of vapor pressure i eystvie.na water discharge. (L

Description

The invention relates to a technique for the automatic regulation of the process of draining water from reservoirs and sumps for storing gasoline fractions and can be used in the oil production and refining industries. A known method of automatically regulating the process of draining water from tanks and sumps for storing oil and petroleum products in which the measurement and control of the level of the phase separation of petroleum products. Water is based on the use of the dependence of the electrical conductivity of the medium on the composition of the liquid of the semiconductor. However, the method does not exclude the ingress of oil products into the water reservoir, which leads to the loss of oil products and environmental pollution. The closest to the invention of the technical essence and the achieved result is a method of automatic regulation of the process of draining water from tanks and sumps for storing gasoline fractions, in which the set value of the separation level of the gasoline fraction — water is maintained depending on the difference in the concentration of oil in the water below the level of separation of the oil product - water and at the outlet of the tank or sump by acting on the discharge of water m. This method of regulation is effective only for drainage of water from tanks and sumps during storage of oil and dark petroleum products. When dredging water from a tank or sump, these concentrations differ slightly and, therefore, the regulation according to their difference is ineffective. In addition, the regulation of this method does not exclude the introduction of benzene into the water reservoir: new fractions, which leads to the loss of oil products. The purpose of the invention is to reduce the loss of gasoline fractions with drainage water. This goal is achieved by the fact that according to the method of automatic regulation of the process of draining water from tanks and storages for storing gasoline fractions, which consists in maintaining the phase separation of the gasoline fraction, water at a given level by affecting water discharge, measure the vapor pressure of the liquid medium at a given level of phase separation in a remote vessel, at the initial boiling point of gasoline fractions and, depending on the value of the vapor pressure, the effect on water discharge is performed. The drawing shows a block diagram of an automatic control system implementing this method. The circuit contains a remote vessel 1 placed in a thermostat 2, a pressure sensor 3 mounted on the remote vessel 1, a regulator 4, the input of which is connected to the output of the pressure sensor 3, an actuator 5 on the water discharge pipe 6 connected to the outlet regulator 4. At this time, the remote vessel 1 is connected to the tank or sump 7 by means of pipeline 8 at a height H corresponding to a given level of separation of the gasoline fraction — water, and at height h through pipe 9 communicated with pipeline 6 to discharge water from the tank or septic tank 7, sposo B control of the process of drainage of water from tanks and sumps is carried out as follows. The gasoline fraction located in the tank 7 at a predetermined height H of the phase separation — water is a liquid medium through the pipe 1 and the pipe 8 is continuously fed into the external vessel 1 and through the pipe 6 is discharged into the water discharge pipe 9. The liquid medium entering the vessel 1 is heated therein to the initial boiling point of the gasoline fractions, as a result of which the liquid medium evaporates and the vapor pressure in the vessel decreases or decreases. The space for vaporization is provided by draining the liquid from the external vessel 1 through a pipe 9 installed at a height h. At the level of phase separation, the Yenzin fraction — water above that stored in the remote vessel I from the reservoir 7 enters a liquid medium, having a certain concentration of benzium, which at the heating temperature coalesces slightly and the elasticity

3,

vapor is negligible. Due to this, the signal value from the pressure sensor 3 to the controller 4 is reduced. Regulator A, comparing this signal with a predetermined value, generates a control action on the executive body 5 to increase the drainage water flow from the reservoir 7.

With a decrease in the phase separation level of the gasoline fraction — water below that set in the remote vessel 1, a liquid medium with a high concentration of gasoline enters, as a result of which intensive vaporization occurs, the pressure in the vessel increases. The signal at the input of the regulator 4 from the pressure sensor 3 is increased. Regulator 4, comparing this signal with a given one, sends a command to executive unit 5 to reduce the drainage water consumption.

292234

Taking into account the losses from the evaporation of oil products from tanks, the ratio of the volumes of the vapor and liquid phases in the remote vessel 1 is assumed (5 equal to 4: 1. In this case, the height of the liquid in the vessel 1 (h) is assumed to be 0.25-0.30 m. Diameter 1 is taken equal to 0.2-0.3 m. The height of the phase separation level of the benzier fraction 10 water in the tank 7 based on the requirement that the dead zone is maintained within 0.50.6 m.

5 The use of this invention does not allow gasoline fractions to enter the water collector, which significantly reduces the loss of oil products, capital and operational costs for collecting oil products from drainage water and protecting the water basin.

Claims (1)

METHOD FOR AUTOMATIC REGULATION OF THE WATER DRAINAGE PROCESS FROM RESERVOIRS AND STOPS FOR STORING GASOLINE FRACTIONS, which consists in maintaining the set value of the phase level of the gasoline fraction - water by affecting the discharge of water, which is different in that, in order to reduce gasoline, drainage vapor pressure of a liquid medium at a given level of phase separation in a remote vessel at the temperature of the onset of boiling of gasoline fractions and depending on the value of vapor pressure to discharge water.