SU1607902A1 - Method and apparatus for cleaning coolant - Google Patents

Abstract

The invention relates to a cryogenic technique, and more specifically concerns units for cleaning a cryoagent from nitrogen and oxygen impurities of helium and hydrogen liquefaction-refrigerating plants. The invention makes it possible to exclude the use of a purified cryoagent for the preparation of adsorbers for operation and to increase the service life of the adsorbent by increasing the stability of the hydrodynamic parameters in the adsorption cycle. This is achieved by the fact that in the cleaning method of the cryoagent, the adsorbers are purged during regeneration with the entire flow of contaminated cryoagent, the adsorbers are regenerated at the same pressure as the adsorption of impurities, and the regenerant stream, after it is cooled and the condensate is drained, is sent for cleaning to pre-cooled second adsorber. In the cryoagent cleaning device, a regenerator is installed, the condensation stage is included in the device constituting a single cascade with the cryoagent cooling stage, while the contaminated flow pipeline is equipped with two additional shut-off elements installed at the inlet of the contaminated flow pipeline and at the cryoagent cooling stage. this stage. 2 sec. f-ly, 1 ill.

Description

The invention relates to a cryogenic technique, and more specifically concerns units for cleaning a cryoagent from nitrogen and oxygen impurities of helium and hydrogen liquefying-and-refrigerating plants.

The purpose of the invention is the elimination of the use of a purified cryoagent for the preparation of adsorbers for operation and an increase in the service life of the adsorbent due to an increase in the stability of hydrodynamic parameters in the adsorption cycle.

The drawing shows a diagram of a device for cleaning a cryogenic agent according to the proposed method for low-temperature cleaning of gels (hydrogen) from impurities N2 and O2.

The device includes two switching adsorbers 1 and 2 filled with activated carbon, a cooling stage of the cryoagent up to the adsorption temperature Ta.a, consisting of a heat exchanger 3 and a liquid nitrogen bath with direct and reverse flow coils, a stage of condensation removal of impurities from the cryoagent used for regeneration a spent adsorber consisting of a heat exchanger 5, a bath 6 of evacuated liquid nitrogen with a coil and a separator 7 of impurity condensate. The pipeline 8 of the direct flow of the cooling stage after the bath 4 is split by directing through the valve 9 to the connection with the pipeline 10 for supplying the regenerating stream and through the valve 11 to the condensing stage. An electric heater 13 is installed on the pipe 10 branching from the pipe 8 to the inlet valve 12. Trubo05 O 1

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14 supplying pipe to adsorbers contaminated (cleaned), regenerating cooling streams with shut-off organs 15 and 16 n supply line 17 to clean the adsorbers of the regenerating flow already passed condensation stage with shut-off members 18 and 19 are connected to the upper part of adsorbers i and 2. Pipeline 20 output purified cryoagent with shut-off bodies 21 and 22; forming a reverse flow in the cooling stage, and a regeneration and o exhaust pipe 23 (of the supplying flow with shut-off elements 24 and 25 are connected to the lower part of the adsorbers 1 and 2. A regenerator 26 is installed on the pipe 23, both ends of which are connected through the shut-off members 27 and 28. with a pipe section 23 connecting the device with adsorbers, and through locking bodies 29 and 30 with a pipe section 23 connecting the regenerator 26 through the first additional locking body 31 to the pipe 8 after the locking body 12, and through the second body valve 32 with the pipe 17 after the valve 11.

The method is carried out as follows.

In the gel purification unit, which includes a heat exchange unit (in which the contaminated cryoagent compressed to a working pressure of Pp 2.5 MPa is cooled to an adsorption temperature of 80 c K), two switching adsorbers 1 and 2 and a condensation removal unit of impurities from the waste regenerating gas The regeneration of the spent adsorber 1 or 2 is carried out in accordance with the proposed method, namely, by flushing the adsorbent layer with the entire stream of contaminated gels heated to the desorption temperature (Tdes "50 ° C) and fed to adsorber 1 during operation and lenii m. e. wherein the adsorption treatment is carried out. The regenerant gas is supplied to the adsorber 1 by simply switching the flow direction (helium, which was previously sent to the adsorber to be cleaned through the heat exchange unit, is sent to the same adsorber, the heat exchange unit with heating in the heater installed on the outdoor line) . The main part. The desorbable impurities are removed from the pipe through the heated gas adsorber in the form of condensate, which is formed by cooling the waste regenerant stream to 65-68 K in the heat exchanger of the condensation unit and then separated in the phase separator. Heated to approximately ambient temperature (when ooratically passing through the heat exchanger 5 of the condensation unit), the regenerating gas is fed for cooling, to the heat exchange 3 cleaning sites and then to the pre-cooled adsorber for cleaning. Ochi, puppy gas is passed in reverse

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through the heat exchanger 5 of the cooling unit and sent to the consumer. The heated adsorber 1 is also cooled by the whole stream of contaminated gels fed to the adsorber 1 at working pressure. The cooling gas is supplied to the adsorber 1 by reverse switching the flow direction (helium, previously sent to the adsorber 1 or 2 along the bypass line, is directed to the same adsorber 1 or 2 through a heat exchange unit). At the beginning of the cooling, until the adsorber 1 is removed from the contaminated gels in its cavity, the effluent from the apparatus to be cooled is directed to the after-treatment to the adsorber 5 2 (through the condensation unit). Subsequent cooling is carried out with delivery of the cryogenic agent to the consumer. After the cooling of the regenerated adsorber 1 is completed, the devices are switched, i.e. the adsorber 2, 2 ° used previously for cleaning the regenerating cooling flows is put into normal operation. Thus, continuous delivery of the purified cryoagent to the consumer is ensured.

The cryoagent cleaning device operates as follows.

The contaminated cryoagent supplied via pipeline 8 is first cooled in the heat exchanger 3 to -90 K due to heat exchange with the reverse flow of the purified cryoagent and nitrogen vapor leaving the bath 30 to 4 liquid nitrogen, then in the bath 4 to bD 80 K, after which, through the closure organ I, is n-directed through the heat exchanger 5 into the bath 6 of the evacuated nitrogen for cooling to 66-68 K and then impurities are supplied to the separator 7 of the condensate, in which the condensate formed in severe contamination of the cryoagent. After that, the cryoagent is fed back to the heat exchanger 5 and then through the valve 18 (or 19) to the 40 pre-cooled adsorber 1 for purification.

Through the spouting organ 21 (or 22) and adsorber 1 (or 2) purified ip oareHT via pipeline 20, through the nitrogen bath 4 coil, return flow through the heat exchanger 3 to the “regenerator” During the initial period, the initial cooling of the adsorbers 1 and 2 is carried out simultaneously by feeding the cooled contaminated cryoagent in the manner described above to two adsorbers at once. . „„ „50 After that, as adsorber I (or 2) will work until“ breakthrough, its impurities are put on regeneration, for which shut-off organs 19 (or 18), 22 (or 21) are opened. sent the flow of the cryoagent to the adsorber 2 (or 1) close the locking bodies / 1 55 or 22) and 18 (19), open the locking bodies 15 24 (or 25), 27, 30, 31. then close the locking body 12. Thus , the entire flow of the contaminated cryoagent through the pipeline 10 through the electric heater 13, in which the regenerating stream is heated to the desorption temperature Tdes 50 ° C (323 K), and then through the pipeline 14 through the valve 15 (or 16) is fed to the adsorber purge 1 or 2). The regenerating flow through the shut-off organ 24 (or 25) from the adsorber 1 (or 2) cooled to the adsorption temperature is directed through the shut-off Organ 27 to the regenerator 26, where it is heated to ambient temperature, then pipe 23, through the valve body 31 is fed into pipe 8. The cryoagent used for regeneration supplied to pipe 8 is cooled first in heat exchanger 3 and in nitrogen bath 4 to 80 K, and then in heat exchanger 5 and in bath 6 evacuated nitrogen to 66-68 K (i.e. to the level of only 3-5 degrees higher than the freezing temperature of nitrogen), after which impurity 7 separator is supplied to the separator 7, in which the condensate formed during cooling of the cryogenic agent is removed. The cryoagent discharged from the condensate is first directed back to the heat exchanger 5, in which it is heated by 10 degrees due to heat exchange with the direct flow (the aerosol evacuated from the separator 7 is evaporated) and then through the stop valve 20 (or 19) for cleaning into a pre-cooled adsorber 2 (or 1). The purified cryogenic stream through the shut-off organ 22 (or 21) is fed through conduit 20 to remove the heat of adsorption of the nitrogen bath 4 into the coil, is passed back through the heat exchanger 3 and is discharged to the consumer. When the temperature front reaches the outlet end of the adsorber I (or 2) and the flow temperature at the outlet from the adsorber begins to increase rapidly, the waste of the first regenerating gas is directed through conduit 23, mine regenerator 26, through the locking bodies 28 and 30 at its warm end, the locking organ 27 close. The purge of the adsorber I (or 2) is continued until the content of impurities in the inlet and outlet of the regenerating flow apparatus is almost the same. After this, the regeneration of the adsorber I (or 2) is stopped and its cooling is started, for which the electric heater 14 is turned off, the locking member 12 is opened, the locking members 30 and 31 are closed. and then open the locking bodies 9, 29 and 32 and close the locking body II. Thus, the entire flow of the contaminated cryoagent, which has preempted the cooling stage to the adsorption temperature through the pipeline 8, through the locking bodies 9, 15 through the pipeline 15 is fed to the cooling of the adsorber 1 (or 2). Exit through the valve 24 (or 25) from the adsorber 1 (or 2) heated to a temperature

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In the adsorption path, the cooling stream is directed through the stop valve 28 to the regenerator 26, where it is cooled to the adsorption temperature (and then through the stop valve 29 through line 23 through the stop valve 32 and further, at the initial stage of cooling the adsorber 1 (or 2) , through the condensation stage through conduit 17, through the shut-off element 19 (or 18) is fed to the adsorber 2 (or I), while the purified cryoagent leaving the adsorber 2 (or I) through the shut-off body 22 (or 21) 20 issued to the consumer. When the temperature front reaches the output end of the adsorber and the temperature of the outgoing cooling flow will begin to decrease rapidly, the cooling of the adsorber 1 (or 2) is stopped and the adsorber 2 (or 1) is activated in normal cleaning mode, for which the valve 19 (or 18) is opened, shut-off organ 32 is closed, organ II is opened, then 9, 15 (nl 16), 24 (or 25), 28, 29 and 32 are closed. After adsorber 2 (nl 1) will work until “impurity breakthrough, its put on regeneration n repeat the entire adsorption-desorption cycle described above.

The proposed cryoagent cleaning method allows to increase the reliability of helium and hydrogen liquefying and refrigeration units cleaning units, ensures the cryogemmet used to regenerate adsorbers is cleaned without third-party tools, eliminates the use of the purified cryoagent and the possibility of its contamination during the preparation of adsorbers for work.

Claims (2)

Formula isopreteni I. Purification of cryogemt in two switching adsorbers, including adsorption of impurities from the contaminated stream, a cryoagent, heating of the spent adsorber during its regeneration by blowing it with the same cryoagent heated to the desorption temperature, withdrawing the main part of the desorbing impurities from the cooled regenerating stream in the form condensate and cooling the heated adsorber by purging it with a contaminated cryogen, cooled to an adsorption temperature, characterized in that, in order to avoid the use of purified A cryoagent for preparing adsorbers for operation and improving the service life of the adsorbent by increasing the stability of hydrodynamic parameters in the adsorption cycle. The adsorbers are blown during regeneration by the entire flow of the contaminated cryoagent, the adsorbers are regenerated at the same pressure as the adsorber (- impurities, and the regenerating stream after it is cooled and the condensate is drained, the mixture is sent for purification to the second adsorber which is also pre-cooled by the whole stream of the contaminated cryoagent. 2. A device for cleaning a cryoagent, which includes two switching adsorbers, connected by a pipe output of a purified cryoagent with a step of condensation removal of impurities from the cryoagent and a step of cooling the cryoagent to the adsorption temperature, as well as related to the thermal parameters in the adsorption cycle, the device is equipped with a regenerator, both ends which are provided with shut-off organs connected to the adsorbers adjacent to and with the parts of the pipeline of the regenerating and cooling streams departing from them, the condensation The national stage constitutes a single cascade with a cooling stage of the cryoagent, and the pipeline will contaminate the adsorption pathway and also be associated with ,, ,, .. -fjг--., The regenerative flow of the cryo-.done flow is equipped with two additional heating gas generators, shut-off organs mounted on pipeline of cooled flow, passage through its entry into the cooling stage of cooling through the cooling stages of cryoagentat and its output from this level, the pipe of the adsorption temperature and condensation wires of the regenerating supply and cooling are removed and the impurities from the cryoagent feeding the flows into the adsorbers are branched off Contaminated flow pipeline, connecting U-15 from the contaminated flow pipeline, respectively, connects the livery to the pipeline and up to the SECONDLY blocking regenerating gas heater and adsorbers, characterized in that, in order to eliminate the use of the purified cryoagent for preparing adsorbers for slave gas the first and the second shut-off organs, and the return pipelines of the regenerating and cooling streams for cleaning are connected to the piping pipeline for the preparation of adsors to the pduu-ichp and ,,. -t-jg-- -. This increases the service life of the adsorbent of the foam flow, respectively, after the first due to the increased stability of the hydrodynamic and after the second shut-off organs. parameters in the adsorption cycle, the device is equipped with a regenerator, both ends of which are equipped with shut-off elements connected to the adsorbers adjacent to and with parts of the regenerating and cooling streams coming from them, the condensation stage is a single stage with a cryoagent cooling stage, while znenr jn ai n ,,, .. -fjg--., The second flow pipeline is equipped with two additional pipelines of the contaminated flow, respectively, along the pipeline and to the SECOND porous pipe before the first and the second shut-off parts, and the return pipelines of the regenerating and cooling streams for cleaning are connected to the pipeline and the loading pipe. -t-jg-- -. after the first and after the second obstructive organs, respectively.