RU2590544C1 - Device for cleaning natural gas - Google Patents

Abstract

FIELD: gas industry.

SUBSTANCE: invention relates to gas producing industry and is intended for cleaning natural gas from mechanical impurities, evacuated to hydrocarbon production from wells of operating stock. Device for cleaning natural gas comprises cylindrical housing with coaxially installed filtering element, a swirler installed at angle to axis of filtering element. Housing upper part is equipped with two inlet nozzles for uniform gas entry. Flush union is installed in lower part of housing. Swirler is made in form of steel plate located throughout length of filter element.

EFFECT: higher reliability and fail-safe operation of gas cleaning system.

1 cl, 2 dwg

Description

The invention relates to the gas industry and is intended for the purification of natural gas from mechanical impurities carried out with hydrocarbon products from wells of the production fund.

To purify natural gas from mechanical impurities, various separators, filters are installed on its way from the field to the consumer.

Known well screen (RF patent No. 2079638, publ. 05/20/1997), containing a perforated pipe on which filter elements are installed containing stringers, the wire is welded to the outer surface with the formation of gaps between the turns.

The analogue has several disadvantages:

- for its installation, it is necessary to perform killing of wells, to carry out tripping operations of tubing,

- when lowering the slotted filter to the bottom there are risks of damage to the element,

- the cleaning of the filter installed on the bottom is carried out during the overhaul of wells (KRS).

The removal of solids with hydrocarbon products to the gas collection system leads to the risks of mechanical wear and destruction of valves and pipelines.

A direct-flow centrifugal separator is known (RF patent No. 2125905, publ. 02/10/1999), which is an outer cylindrical pipe with a coaxially integrated separation chamber in the form of a cylindrical pipe, in the input part of which there is a tangential swirler, and the outlet pipe of the outlet gas having a smaller diameter than the tube of the separation chamber, and forming with its inner wall a receiving annular gap, passing into the annular gap on the pipe of the separation chamber to output the captured / suspended / phase to the call cavity Ktorov. The capture of the captured phase is made in the form of longitudinal through tangential channels with sharp inlet edges, at the outlet of which a vertically directed pipe for collecting the captured phase is connected to the bottom of the collector in the form of a tee. At the same time, two inertial separators are sequentially installed in the annular cavity behind the collector, the first of which is designed as an axial blade swirl, and the second in the form of through tangential channels located in the upper sector of the outlet end of the purified gas outlet. To remove the remainder of the finely dispersed captured phase, the lower half of the annular cavity between the separators is connected by a pipeline with the cavity of the vertical pipe for collecting the captured phase.

This separator is characterized by metal consumption, the complexity of manufacturing and installation.

A device for the purification of natural gas (AS 869796, publ. 07.10.1981, B01D 45/12), consisting of a cylindrical body in which one cylindrical filter element is mounted, worn on a perforated tube (frame). A section (casing) is installed coaxially to the filtering element and the housing, made in the form of a truncated cone, into which twisting devices (swirlers) are installed at the inlet and after a certain distance along the length of the filtering element. At the outlet of the section, a partition is installed to seal the clean gas chamber. The ratio of the diameter of the section at the installation of the swirler to the diameter of the filter element is assumed to be (1.2-2.5): 1. The installation angle of the blades of the swirlers to the axis of the filter element varies in length within 15-85 °.

The disadvantage of this device is the inefficient use of the volume of the housing for mounting filter elements in it, due to which the total filtering surface is not large enough, in addition, the device is intended only for cleaning gas from liquids and has no outlet for mechanical impurities, which negatively affects the degree of purification gas.

The problem to which the invention is directed, is to eliminate the above disadvantages with greater efficiency of the process compared to the prototype.

The technical result achieved by using the proposed invention is to increase the reliability and trouble-free operation of the gas purification system, to reduce the risks of incidents associated with the destruction or partial mechanical wear of shut-off and control valves and pipelines.

The technical result is achieved by the fact that in a device for purifying natural gas containing a cylindrical housing with a coaxially mounted filter element, a swirl mounted at an angle to the axis of the filter element, according to the invention, the housing in the upper part is equipped with two inlet nozzles for uniform gas entry, and in the lower a flushing fitting is installed on the part of the housing; the swirler is made in the form of a steel plate located along the entire length of the filter element.

The device is illustrated by drawings, which depict:

in FIG. 1 - general view of the device;

in FIG. 2 is an end view of the device.

The device comprises a cylindrical body 1 (Fig. 1), in which the filter element 2 is coaxially mounted. The diameter of the filter element 2 body is determined by the specific content of mechanical impurities in the gas and the service period.

Along the entire length of the filter element 2 is located a swirl made in the form of a steel plate 3 mounted at an angle to the axis of the filter element 2. In the upper part of the housing 1 there are two inlet nipples 4 for uniform gas entry from the pipeline 5, equipped with a tee 6 and outlet 7. Purified from mechanical impurities, natural gas leaves the housing 1 through the outlet nozzle 8. To control the operating parameters of the device, at the inlet and outlet, there are manometric nozzles 9 equipped with shutoff valves. In the lower part of the housing 1, a flushing fitting 10 is installed to remove mechanical impurities from the housing 1.

The device operates as follows.

Natural gas through a portion of the pipeline 5, equipped with a tee 6 and a branch 7, through two inlet nozzles 4 is uniformly supplied to the housing 1 of the cleaning device. The separation of the gas flow at the inlet to the housing 1 allows you to evenly distribute natural gas along the entire length of the device in order to ensure coverage of the maximum area of the filter element 2. Immediately at the entrance, the gas enters a swirl made in the form of a steel plate 3 with a thickness of 4 mm, a length equal to the length of the filter element 2 mounted at an angle of 30 ° to its axis. The steel plate 3 allows, firstly, to protect the filter element from destruction when gas with mechanical impurities enters it, and secondly, to twist the gas flow along the wall of the filter element 2 body with the formation of centrifugal force, which helps to separate particles of mechanical impurities from the natural gas stream .

Gas inside the device moves along the side wall of the housing 1 along a spiral path. As it moves, natural gas tends to the center of the housing 1, gradually falling on the outer surface of the filter element 2 located along the symmetry axis of the housing 1 of the device.

Passing through the filter element 2, natural gas is purified from the main part of mechanical impurities: a small part of the impurities is initially separated from the natural gas stream already on the swirl plate steel plate 3 due to a sharp change in the velocity and trajectory of the gas at the entrance to the housing 1.

Purified from mechanical impurities, natural gas leaves the housing 1 through the outlet fitting 8.

Filtered mechanical impurities gradually accumulate on the side (working) surface of the filter element 2 and, as the layer thickness increases under the action of gravity, they settle on the inner surface of the side wall of the housing 1 of the device along the lower generatrix. To clean the housing 1, a flushing nozzle 10 is provided. The flushing nozzle 10 is equipped with shutoff valves and a quick-disconnect connection for connecting a high pressure hose to a mobile steam installation.

To control the operating parameters of the device at the input and output, there are manometric fittings 9 equipped with shutoff valves. If the critical value of the pressure drop in the device is reached, the gas flow is transferred to the main working line of the pipeline 5, and the housing 1 is subjected to cleaning.

This device for purification of natural gas from mechanical impurities is installed on the pipeline to the site of the dismantled Nadym installation, designed for special gas-dynamic studies of gas wells, which leads to the optimization of the process of purification of natural gas from mechanical impurities by eliminating operations to shut down a gas well for overhaul . The device is fixed to the standard flange connections of the Nadym installation.

Claims (1)

A device for purifying natural gas, comprising a cylindrical housing with a coaxially mounted filter element, a swirler mounted at an angle to the axis of the filter element, characterized in that the housing in the upper part is provided with two inlet nozzles for uniform gas entry, and a washing nozzle is installed in the lower part of the housing , the swirl is made in the form of a steel plate located along the entire length of the filter element.

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