RU2019277C1 - Gas cleaning apparatus - Google Patents

Abstract

FIELD: chemical industry. SUBSTANCE: gas mixture to be cleaned through diffuser 9 is supplied to external surfaces of hollow fibres 4 of separating modules 3. Substances that pollute the air to be cleaned are diffused through walls into the central channels of hollow fibres 4. From there they are blown out by a stream of scavenging gas. The latter is supplied from the closed system through valve 13 and manifold 11. The discharged scavenging gas together with contaminants is gathered in manifold 12 and exhausted into the atmosphere through gas discharge facility 16. EFFECT: enhanced quality of cleaning. 3 dwg

Description

 The invention relates to apparatus for cleaning gas streams and can be used in chemical and other industries for gas purification.

 A known apparatus for cleaning gases, containing a tubular body, the membrane elements are placed in the latter in the form of hollow fibers, fixed on one side in a tubular lattice installed in the tubular body, and plugged on the other side. The tubular body has a fitting for the input and output of the shared gas mixture, and at the end of the body there is a lid through which permeate is discharged from the hollow fiber channels.

 The disadvantages of the known apparatus are the difficulty of removing permeate, since a significant pressure drop is required, and the uneven flow around the hollow fibers of the mixture to be separated.

 A gas separation apparatus is known in which a bundle of hollow fibers is fixed in two tube sheets, from which the open ends of the hollow fibers protrude. The flow of the mixture to be separated is fed to the hollow fibers, and the permeate is discharged through a fitting on the tubular body.

 The known apparatus also does not provide uniform flow around a bundle of hollow fibers, which reduces the quality of the cleaned gas mixture.

 Closest to the technical nature of the claimed device is an apparatus for cleaning gases, comprising a housing, a separation module disposed therein, including a bundle of hollow fibers and end blocks for sealing the open ends of the latter.

The disadvantages of the known apparatus are as follows:
the apparatus is integral, which limits its use, incapacitates it when fibers are damaged and complicates their cleaning; insufficient quality removal of permeate from the space between the hollow fibers, since the cleaned stream does not wash all the fibers, and its main part can fall into the space between the wall of the housing and the fiber bundle;
the same flow intensity is not ensured for different fibers (in the central part, the flow rate is higher than at the ends) for fibers of short length, i.e. with a low hydraulic resistance of the apparatus.

 The aim of the invention is to increase reliability, improve operation and expand technological capabilities.

 Figure 1 shows the apparatus for gas purification, General view; figure 2 is a section along aa in figure 1; figure 3 is a section along BB in figure 1.

 The gas purification apparatus comprises a box-shaped body made up of two blank walls and a frame 2 connecting them. A number of separation modules 3 with hollow fibers 4 placed perpendicular to the stream of gas to be cleaned are placed in the body. End blocks 5, made in the form of parallelepipeds and designed to seal the open ends of the hollow fibers 4, are placed in the blind body. The blind walls 1 of the case have alternating protrusions 6 and depressions 7 in contact with the hollow fibers 4, and internal grooves 8 for accommodating the ends of the parallelepipeds 5 In the open ends of the housing are placed a diffuser 9 for inputting a cleaned stream and a confuser 10 for outputting a cleaned stream into a closed system. Two collectors 11 and 12 are mounted on the frame 2 opposite to each other. The collector 11 is for supply, and the collector 12 is for removal of purge gas. Two valves 13 and 14 are provided for passing the flows of the cleaned and purged gases. Valve 13 is mounted on a section of the confuser 10 to output the cleaned flow, and valve 14 is installed at the inlet of the manifold 11 for supplying purge gas. At the inlet of the diffuser 9, a means 15 for shutting off the stream to be cleaned is installed, and at the outlet of the collector 12, means 16 for blocking the purge gas removal are installed. Both collectors 11 and 12 have a variable cross section, and the cross section of the collector 11 is made decreasing in the direction of flow, and the cross section of the collector 12 is increasing in the direction of flow.

 Apparatus for gas purification works as follows.

 At the initial moment, the purified flow inlet diffuser 9 and the purge gas removal manifold 12 communicate with the atmosphere. The means 15 and 16 for shutting off the flow of the cleaned stream and the removal of purge gas are closed. The supply manifold 11 and the purge gas removal manifold 12 are connected to the closed system via volumetric pumps (not shown in the figures). Means 15 and 16 are opened, overlapping the cleaned and purge flows and turn on the pumps (not shown in the drawing). A portion of the cleaned air is supplied through the diffuser 9 to the outer surfaces of the hollow fibers 4, which make up a series of separation modules 3. Then, the cleaned flow moves between them to the confuser 10. Due to the value of the protrusions 6 and the depressions 7 on the blind walls 1, the cleaned stream is prevented from entering the space between the housing and separation modules. End blocks 5 are placed on the housing. They serve to seal the open ends of the hollow fibers 4 and prevent the cleaned and purge flows from entering the space between the housing and the separation modules 3. At the same time, valve 14 opens and the pump (not shown) delivers the cleaned flow into a closed volume . Substances polluting the air flow diffuse through the walls of the hollow fibers 4 into their central channels. They are blown out of these channels by a stream of purge air supplied in portions from a closed system (not shown) through a valve 13 and a manifold 11. The purge air to be removed with contaminants is collected in the manifold 12 and discharged into the atmosphere through the purge gas removal means 16. Thus, the purified air (or another gas stream) is supplied in portions to the external surfaces of the hollow fibers 4, and the purged air also removes substances that have penetrated through the walls of the hollow fibers 4 in portions into the atmosphere.

Claims (1)

 A GAS CLEANING APPARATUS, comprising a housing, a separation module placed therein, including a bundle of hollow fibers, and end blocks for securing the open ends of the latter, characterized in that it is equipped with additional separation modules with hollow fibers installed perpendicular to the stream of gas to be cleaned, a diffuser for the inlet of the stream of purified gas and a confuser for outputting a stream of purified gas, two manifolds for supplying and removing purge gas, two valves, one of which is installed in the confuser, and others coal - in the manifold for supplying purge gas, and two means for blocking the flows of the purified and purified gases, installed respectively in the diffuser and in the manifold for removing purge gas, while the blocks are made in the form of parallelepipeds, the body is box-shaped and composed of two blank walls and the frames connecting them, and the blind walls have grooves on the inner surface to accommodate the ends of the parallelepipeds and alternating protrusions and depressions in contact with the hollow fibers, the diffuser and the confuser are placed in covered the ends of the housing, the collectors are mounted on the frame opposite to each other and have a variable cross-section, wherein the header section for supplying purge gas formed decreases in the flow direction, and the collector section to remove the purge gas - by increasing the flow direction.

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