RU2244276C1 - Device for determining pressure of saturated fumes of oil and oil products - Google Patents

Abstract

FIELD: oil-extractive industry.

SUBSTANCE: dosing chamber is provided with removable self-supporting thermostatic sample-picker. Locking elements of sample-picking and draining valves are made in form of T-shaped end pieces with central T-like apertures and compactions of elastic material. Locking element of draining valve is provided with spring. Turbulence valve is made moveable, placed in lower hollow of dosing chamber, its locking element is made in form of sharpened end piece, fixed by blunt end to piston of measuring chamber, body being moveably fixed on end piece. Hollows of dosing and measuring chambers are interconnected through aperture in locking element of turbulence valve.

EFFECT: higher precision, trustworthiness and speed of operation.

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Description

The invention relates to a device for determining the pressure of saturated vapors and can be used in oil and gas, oil and gas processing and other industries for the analysis of the quality of oil and oil products.

A technical solution is known (see patent 2055335 RU, IPC G 01 L 11/00 Automatic meter for saturated vapor pressure of oil and oil products. 02.27.96, Bull. 6), in which the device is equipped with a microprocessor with an indication unit, two hydraulic actuators with working cylinders, a supply channel switch and a drain valve, and each chamber a corresponding membrane separating the chambers into two cavities - a supramembrane and a submembrane, while the submembrane cavity of the first chamber is connected to the supmembrane cavity of the second chamber through a turbulent th valve and with a drain through the drain valve, and the supmembrane cavity of the second chamber is connected through a sampling valve to the inlet pipe with the test liquid, the submembrane cavity of the second chamber and the supmembrane cavity of the first chamber connected by channels to the working cylinders of two hydraulic actuators connected to the switch of the supply channels connected control with a microprocessor connected to a pressure transmitter.

The disadvantage is low reliability, accuracy and efficiency of product quality assessment.

The closest technical solution to the proposed invention is (see AS 1651156, G 01 N 7/00, 05/23/91, Bull. 19), in which the device contains a first chamber with a manometer and a second chamber connected to it by a valve , the first chamber, which is a measuring one, is equipped with a piston stroke meter, and the second chamber is equipped with a cylinder of compressed air, and the chambers are equipped with jackets connected to each other and to two chambers by means of a valve.

The disadvantage is the low accuracy and efficiency of determining the pressure of saturated oil vapor.

The purpose of the invention is to increase the accuracy, reliability and efficiency of measuring the pressure of saturated vapors with strictly fixed phase ratios and temperature.

This goal is achieved in that the second chamber, which is a dosing, is equipped with a removable self-supporting thermostatic sampler, the locking elements of the sampling and drain valves are made in the form of T-shaped tips with central T-shaped holes and seals made of elastic material, and the locking element of the drain valve is equipped with a spring , the turbulizing valve is movable, placed in the cavity of the dosing chamber, its locking element is made in the form of a pointed tip, attached Nogo blunt end to the piston of the measuring chamber housing with seals slidably fastened on the tip, and the dosage cavity and the measurement chambers are interconnected through a hole on the valve closure member turbulence.

Figure 1 shows a schematic diagram of a device. The device includes measuring 1 and dosage 2 chambers with pistons 3 and 4, sampling 5, drain 6 and turbulizing 7 valves, thermostatic jackets 8 and pressure transducer 9.

The sampling valve shown in figure 2, has a vertically located in the housing 1 T-shaped locking element 2 with a T-shaped channel 3 and a seal 4.

The drain valve shown in figure 3, has a housing 1, a T-shaped locking element 2 with a T-shaped channel 3, a seal 4 and a spring 5.

The turbulizing valve shown in Fig. 4 is located in the lower cavity of the metering chamber and consists of a movable housing 1, with seals 2 and 3, a pointed locking tip 4 attached with a blunt end to the piston of the measuring chamber and communicating the cavities of both cameras.

A retaining gas chamber 10 is connected to the upper cavity of the dosing chamber (Fig. 1), and a removable self-supporting thermostatic sampler consisting of a cylinder 12, a thermostatic jacket 13, a piston 14, a spring 15, a press 16 is connected to the lower cavity through a sampling valve and a filter 11. input 17 and output 18 gates.

The control unit 19 is connected to an electric actuator 20, a pressure transducer, microswitches 21 and ensures the operation of the device in manual and automatic modes.

The device operates as follows. In the initial state, the pistons 3, 4 of both chambers are in the lowermost positions, the sampling 5 and drain 6 valves are closed, the turbulizing valve 7 is open, its housing with a seal 3 (figure 4) blocks the inlet channel into the lower cavity of the metering chamber. The product is sampled in the sampler, it is connected through the filter to the sample valve, the spring 15 above the piston of the sampler is compressed, the outlet valve 18 is open, constant temperature water is supplied to the thermostatic shirts 8, 13 (Fig. 1).

After the device is turned on, the piston 4 of the measuring chamber 1 moves up, after 1-2 seconds the tip abuts against the opening of the turbulent valve body, closes it and then, together with the piston 3 of the metering chamber 2, starts to move upward, while the valve body rises with the seal and opens the inlet channel. In the process of movement of the piston 3 upward, due to the resulting pressure difference in the lower cavity of the dosing chamber and in the sampler, the shut-off element 2 (Fig. 2) rises, the sampling valve opens and the spring-loaded piston 14 of the sampler, as the piston 3 is raised, delivers the analyzed product to the lower cavity of the chamber 2. The value of the dosed volume of the product is determined by the diameter of the piston 3 and its stroke length, set by the position of the microswitches 21.

In the process of movement of the pistons upward, the pressure in the measuring chamber rises and the shut-off element 2 (Fig. 3) is squeezed out, the drain valve 6 opens and the product or air in it is forced out of the chamber, and during the downward movement a vacuum is created in it.

After the pistons 3 and 4 reach their extreme upper positions, the actuator 20 is automatically switched downward. In this case, the sampling valve 5 is closed. As you move down the piston 3 comes out of contact with the housing of the turbulizing valve 7, the pressure in the lower cavity of the metering chamber 2 becomes equal to the pressure in the retaining gas chamber 10.

After the casing 1 of the turbulizing valve (Fig. 4) reaches its lowest position, it stops, blocking the inlet channel of the metering chamber with a sealant 3, the valve and the product open, under the action of the piston 3 (Fig. 1) and pressure in the retaining chamber 10 , in turbulent mode passes into the evacuated cavity of the measuring chamber. As soon as the piston 3 reaches its lowest position, the inlet channel from the sampling valve 5 closes. Due to turbulization and vacuum, the product that entered the measuring chamber almost immediately becomes in equilibrium with its vapor, the pressure in the chamber, which is the pressure of saturated vapors, is fixed and the second measurement begins, which occurs similarly to the first.

After the device has made a given number of measurements, the average value of the saturated vapor pressure is displayed on the display unit.

The use of the invention allows very quickly, within 1.5 minutes, with an error not exceeding 1 kPa, to determine the pressure of saturated vapors, which is necessary, in particular, when assessing the quality of oil and oil products, as well as when assessing the loss of hydrocarbons from evaporation.

Claims (1)

A device for determining the pressure of saturated vapors of oil and oil products, containing a metering and measuring chambers with movable pistons placed in a thermostatted jacket, a pressure transducer, a microprocessor with an indicating unit, a retaining gas chamber, sampling, drain and turbulent valves, characterized in that the metering chamber is equipped with a removable self-supporting thermostatically controlled sampler, locking elements of the sampling and drain valves are made in the form of T-shaped tips with T-arr. with openings and gaskets made of elastic material, and the shut-off element of the drain valve is equipped with a spring, the turbulizing valve is movable, placed in the lower cavity of the metering chamber, its shut-off element is made in the form of a pointed tip attached with a blunt end to the piston of the measuring chamber, the housing is movably fixed on the tip and the cavities of the metering and measuring chambers are interconnected through an opening in the shut-off element of the turbulizing valve.

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