RU1778538C - Device for measuring pressure drop and level in fractionating towers and reaction vessels - Google Patents

Abstract

Usage: the invention relates to instrumentation and can be used to measure the differential pressure and level in apparatuses and tanks. SUMMARY OF THE INVENTION: the device comprises a differential pressure meter with a power transducer, separation vessels connected to one input with a differential pressure gauge, and the other to an apparatus, a filled vessel connected through valves with pulse lines of the differential pressure gauge and separation vessels. The separation vessels are made in the form of two chambers separated by a sealed flexible partition in the form of a siphon or membrane, one chamber is filled with a separation liquid, and the other chamber is capable of communicating with the atmosphere or a source of stabilized pressure. 2 ill.

Description

The invention relates to instrumentation and can be used in various fields of national economy for measuring pressure drop and level in distillation columns, reactors and tanks for liquefied gases.

The purpose of the invention is to increase the accuracy of measurements by eliminating the influence of the difference in weight between the columns of the separation liquid when the separation vessels are installed at different heights.

In FIG. 1 is a schematic diagram of an apparatus for measuring pressure drop and level of a liquid and liquefied gases; in FIG. 2 - for measuring pressure drop and level of easily solidifying and crystallizing liquids.

A device for measuring the differential pressure and level in distillation columns and reactors consists of a differential pressure gauge 1, separation vessels 2, in which there is a sealed partition 3, a filling vessel 4; which through valves 5 and 6 is connected to the impulse lines of the differential pressure gauge 1, valves 7 and 8, through which the chamber of the separation vessel filled with the separation liquid is connected to the atmosphere (stabilized power supply), and apparatus 9, respectively.

The device operates as follows.

Before turning on the device, the chambers of the differential pressure gauge 1, pulse lines and separation vessels 2 are filled with separation liquid through the filling vessel 4. To do this, shut-off valves 8 are closed, and valves 5-7 are opened. The sealed partition 3 then moves to the right (Fig. 1) or down (Fig. 2). To remove gas cushions from the system, if the device (container) is operating under excessive pressure, it is enough to close the shut-off valves 7 and open the valves 8. after which the septum 3 is tight (force

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background or membrane) will move to the left position (Fig. 1) and the upper position (Fig. 2) and displace part of the separation liquid with gas bubbles into the filling vessel 4. After that, the operation of filling the system with the separation liquid must be repeated. If the apparatus (container) is operated under atmospheric pressure or vacuum, then an external pressure source is connected to the valves 7 to remove gas cushions with closed valves 8.

After filling the system with the separation liquid, they begin to adjust the zero and calibrate the device. To adjust the zero when valves 5-8 are closed, valves 7 are opened. Then, the zero corrector combines the readings of the differential pressure gauge 1 with a zero mark on its scale. Then, to the separation vessel connected to the positive chamber of the differential pressure gauge 1 through the valves 7, a stabilized power supply is connected, consisting, for example, of a gearbox and a reference pressure gauge, by which the instrument is calibrated.

After calibration, the valves 7 are closed, and the valves 8 are opened and the device is turned on. Subsequently, during operation of the device, when the density of the separation liquid changes, caused, for example, by a change in the ambient temperature, it is enough to carry out only zero adjustment. To prevent the membrane from collapsing due to unilateral overpressure and to prevent the membrane from sticking to the walls of the vessel, restrictive grids are installed on both sides of the vessel.

When measuring the pressure drop in vessels with easy-setting and crystallizing liquids, separation vessels can be placed inside the apparatus (vessel) (Fig. 2). At the same time, the shut-off valves 8 connecting the apparatus (container) to the separation vessels 2 are also placed inside the apparatus (container) and are controlled by a rod brought out through the stuffing box.

Claims (1)

The claims A device for measuring the differential pressure and level in distillation columns and reactors, containing a differential pressure meter, a filling vessel with a separation liquid and separation vessels connected to the first inlets with a differential pressure gauge and a filling vessel, and the second inputs of each of the separation vessels made with the possibility of connecting through valves with controlled apparatus, characterized in that, in order to improve the measurement accuracy by eliminating the influence of the difference in the weight of the columns of the separation liquid when installing separation vessels at different heights, the separation vessels are made in the form of two chambers separated by a flexible sealed partition, while the chambers connected to the first inputs are filled with a separation liquid, and the impulse lines of the second inputs are made with the possibility of connecting through the valves to the atmosphere.