RU2311944C1 - Natural gas cleaning filter - Google Patents

Abstract

FIELD: gas industry, in particular, technique used at compressor plants of main pipelines for fine cleaning of natural gas supplied from underground storages from dropping liquid and mechanical contaminants.

SUBSTANCE: natural gas cleaning filter has filtering member formed as perforated cylinder covered with hydrophobic material, bottom and cover. Hydrophobic material formed as needle-stitched web is wound onto cylinder and comprises mixture of thin, medium and coarse polyester fibers used in weight ratio of (70-80): (10-15):(10-15), respectively. Ratio of cylinder outer diameter to filter outer diameter is 1:(1.2-1.6). Fibers may be produced from Lavsan polyester. Filter of such structure has continuous service life greater than standard service life by 2-3 times.

EFFECT: increased efficiency in cleaning of gas, increased dust retention capacity and improved strength of filter.

2 cl, 1 dwg

Description

The invention relates to the gas industry and can be used at compressor stations of gas pipelines for fine purification of natural gas supplied from underground storage from drip liquids and solids.

A known filter for integrated cleaning of a fluid medium (USA, US Pat. No. 4032457 dated 04.06.75, class V01D 25/04) having a perforated plastic tube with an adjacent fibrous layer of active powder material, a fibrous layer as a prefilter, and an outer perforated shell , bottom and cover. The disadvantage of this filter is the complexity of its design and a smaller resource of continuous operation.

The closest to the proposed technical essence and the number of matching features is a gas purification device containing a filter element made in the form of a perforated cylinder coated with a hydrophobic filter material with a bottom and a cover (USSR, AS No. 869796 from 03.10.75, cl . V01D 45/12). This technical solution is taken as a prototype of the invention.

The disadvantage of the prototype are lower cleaning efficiency and dust absorption, less continuous resource of the prototype device in comparison with the proposed filter.

The objective of the invention is to create an effective, durable filter with a long resource of continuous operation for purifying natural gas supplied from underground storage facilities at compressor stations of main gas pipelines.

The technical result achieved by the implementation of the invention is to significantly increase the efficiency of purification of natural gas from droplet moisture and mechanical impurities with a particle size of 0.1 μm or higher with a significant increase in the resource of continuous operation of the filter, its dust capacity and strength.

The specified technical result is achieved due to the fact that in the filter for cleaning natural gas from droplet moisture and mechanical impurities, containing a filter element in the form of a perforated cylinder coated with a hydrophobic filter material, the bottom and cover, the filter material made in the form of a needle-punched cloth, are wound on a cylinder and consists of a mixture of fine (with a linear density of 0.30-0.36 tex), medium (with a linear density of 0.90-1.10 tex) and coarse (with a linear density of 1.80-2.20 tex) polyester fibers, taken in the ratio by weight (70 ÷ 80) : (10 ÷ 15) :( 10 ÷ 15), respectively, while the ratio of the outer diameter of the cylinder to the outer diameter of the filter is 1: (1.2 ÷ 1.6), and the fibers can be made of lavsan.

The difference between the present invention and the prototype is that the filter material, made in the form of needle-punched cloth, is wound on a cylinder and consists of a mixture of thin, medium and coarse polyester fibers taken in the ratio by weight (70 ÷ 80) :( 10 ÷ 15) :( 10 ÷ 15), respectively, while the ratio of the outer diameter of the cylinder and the outer diameter of the filter is 1: (1.2 ÷ 1.6). Another difference is that the fibers are made of lavsan.

The use of these features in the proposed filter allows with high efficiency and dust capacity to significantly increase the resource of its continuous operation.

From the scientific and technical literature, the authors are not aware of a filter for purifying natural gas from droplet moisture and mechanical impurities containing the claimed features.

The invention is illustrated by the drawing, which shows a front view in section of a filter for purification of natural gas. The proposed filter includes a perforated cylinder 1, a filter material 2 wound thereon from a mixture of thin, medium and coarse polyester fibers, a cover 3 and a bottom 4.

The filter works as follows. Contaminated natural gas passes through the filter material and, cleaned of drip moisture and mechanical impurities, enters the cylinder and exits the filter.

The use of hydrophobic polyester fibers makes it possible to efficiently extract droplet moisture from natural gas without fiber swelling and allows it to drain into the condensate collector.

The filter material is a needle-punched fabric and is made as follows. Thin, medium and coarse polyester fibers (preferably dacron) are taken in the ratio by weight (70 ÷ 80) :( 10 ÷ 15): 10 ÷ 15), respectively, loosened and mixed on a pinch machine, combed on a carding machine, form a cloth and pierce in needle-punched assembly.

As a result of testing the prototypes of the proposed filters, the most effective, dusty and with the longest service life were filters in which the filter material is made of hydrophobic fibers and is a needle-punched cloth consisting of a mixture of thin, medium and coarse polyester fibers taken in the ratio by weight ( 70 ÷ 80) :( 10 ÷ 15) :( 10 ÷ 15), respectively, with the ratio of the outer diameter of the cylinder and the outer diameter of the filter 1: (1.2 ÷ 1.6). The best performance was for filters in which lavsan was used as polyester fibers.

These tests also showed that if the ratio of fine, medium and coarse fibers is greater than the declared, then this leads to an increase in the aerodynamic drag of the filter, its quick clogging and, as a consequence, a decrease in the resource of its operation. With a smaller ratio of fine, medium and coarse fibers, the gas cleaning efficiency is reduced.

If the ratio of the outer diameter of the cylinder and the outer diameter of the filter is less than stated, then the required service life, dust absorption and efficiency of the filter do not reach, and if this ratio is greater than declared, the overall dimensions of the filter are unreasonably increased, which creates inconvenience during operation.

Thus, the proposed filter for the purification of natural gas from droplet moisture and mechanical impurities allows 2-3 times to increase the resource of continuous operation with high strength, efficiency and dust absorption.

From the above it follows that each of the features of the claimed combination to a greater or lesser extent affects the solution of the problem, and the entire population is sufficient to characterize the claimed technical solution.

Claims (2)

1. The filter for cleaning natural gas, containing a filter element in the form of a perforated cylinder coated with a hydrophobic filter material, a bottom and a cover, characterized in that the filter material, made in the form of needle-punched cloth, is wound on a cylinder and consists of a mixture of thin, medium and coarse polyester fibers taken in the ratio by weight (70-80) :( 10-15) :( 10-15), respectively, while the ratio of the outer diameter of the cylinder and the outer diameter of the filter is 1: (1.2-1.6). 2. The filter according to claim 1, characterized in that the fibers are made of lavsan.