RU2177122C1 - Method for cooling gas and pulsation type cooler for performing the same - Google Patents

Abstract

FIELD: processes and equipment for cooling gas. SUBSTANCE: method comprises steps of periodically alternatively joining each tube of bundle of pulsation tubes with source of high-pressure gas; cutting off tube volume; displacing gas to receiver at expanding and cooling gas; discharging gas out of receiver at expanding and cooling it and removing gas while simultaneously cutting off tube for reverse compression of residual gas; expanding gas discharged from tube and cooling it at similar conditions in annular diffuser having uniform section. Pulsation type gas cooler includes housing with high-pressure and low-pressure chambers, bundle of pulsation tubes, receiver and recuperation type heat exchanger. Slide valve of gas distributor includes arranged alternatively inlet and outlet ducts. Low-pressure chamber is in the form of annular diffuser with regular cross section embracing slide valve. Slide valve and housing have at least one pair of coaxial annular protrusion and annular recess combined with formation of clearance. EFFECT: enhanced uniformness of gas cooling. 2 cl, 1 dwg

Description

 The invention relates to refrigeration and technology.

 A known method of gas cooling, comprising periodically connecting each of the set of pulsating pipes with a spool, cutting off the volume of the pulsating pipe with gas displacement into the receiver with expansion and cooling, connecting the pulsating pipe with curved diffusers located in the spool to discharge gas from the receiver with expansion and cooling, gas transmission through an annular diffuser with expansion and cooling and removal of cold low-pressure gas with simultaneous cutting off of the volume of the pulsation pipe from the return second compression of the residual gas (patent RU 2052179 C1, class F 25 9/00, 1996).

 Known pulsating gas cooler, comprising a housing with high and low pressure chambers, a bundle of pulsating tubes of constant volume with separated confuser-diffuser channel of the "cold" and "hot" zones, connected to the "hot" zone through a gas-dynamic check valve, a dead end receiver and a regenerative heat exchanger, and a gas distributor connected to the “cold” zone with inlet channels alternately arranged in the spool in communication with the housing high pressure chamber and outlet channels made in de curvilinear diffusers directed from the entrance to the end of the spool to the exit tangentially to its peripheral surface, in communication with the low-pressure chamber housing, made in the form of an annular diffuser enclosing the spool (ibid.).

 The disadvantage of this method in the device is the uneven cooling of the gas, depending on the location of the pulsation pipes due to the ingress of gas in the snug diffuser into areas with different cross-sectional areas.

 The technical result of the group of inventions is to increase the uniformity of gas cooling.

 This result is achieved by the fact that in the method of gas cooling, which includes periodic alternating connection of each of the set of pulsating pipes with a spool, cutting off the volume of the pulsating pipe with gas displacement into the receiver with expansion and cooling, connecting the pulsating pipe to curved diffusers placed in the spool for gas discharge from a receiver with expansion and cooling, passing gas through an annular diffuser with expansion and cooling and removal of cold low-pressure gas with simultaneous cut-off According to the invention, the gas discharged from each pulsation pipe is expanded and cooled under the same conditions in an annular diffuser with the same cross section.

 The same result is achieved in that in a pulsating gas cooler containing a housing with high and low pressure chambers, a bundle of pulsating tubes of constant volume with cold and hot zones separated by a diffuser-diffuser channel, connected to the hot zone through a gas-dynamic return the valve is a dead end receiver and a recuperative heat exchanger, and a gas distributor connected to the "cold" zone with inlet channels alternately located in the spool, in communication with the housing high pressure chamber, and exhaust according to the invention, the diffuser is made with the same cross section and the valve spool is provided with the channels made in the form of curved diffusers directed from the entrance to the end of the spool to the exit tangentially to its peripheral surface, in communication with the low-pressure chamber of the housing made in the form of an annular diffuser enclosing the spool and the housing is made of at least one pair of coaxial annular protrusion and annular cavity, combined with the formation of the clearance.

 The group of inventions is illustrated in the drawing, which shows a General view of a pulsating gas cooler for implementing the method.

 The pulsating gas cooler comprises a housing 1 with chambers 2 and 3 of high and low pressure, a gas distributor located in it, consisting of supports 4 and 5 and installed in them with the possibility of rotation of the valve 6. Housing 1 has nozzles 7 and 8 for supplying gas under pressure and exhaust cold gas low pressure respectively. In the cover 9 of the housing 1 there are receiving holes 10 of the pulsation tubes 11, which are attached to the flange 12. In the spool 6 there are nozzles 13 connected by a channel 14 to a chamber 2, as well as channels 15 connected through curved diffusers 16 to a chamber 3, made in the form covering the spool 6 of the ring diffuser. Each pulsation pipe 11 consists of a working section 17, which is a "cold zone", a booster section 18, which is a "hot zone", channels 19 and 20 and a receiver 21. The confuser-diffuser channel 20 has a check valve 22. In a preferred embodiment the spool 6 and the housing 1 are made with at least one (shown with one) pair of coaxial annular protrusion 23 and the annular cavity 24, combined with the formation of the clearance.

 In the proposed device, the method is implemented as follows.

 When rotating from a drive (not shown) in the bearings 4 and 5 of the spool 6, the high-pressure gas supplied through the pipe 7 to the chamber 2 through the channel 14 and the nozzle 13 enters alternately into the receiving holes 10 of the pulsation tubes 11. When the pipe 11 is subsequently cut off from the chambers 2 and 3 of the housing 1, the gas passes sequentially through its sections and channels 17, 19, 18 and 20 and with expansion and cooling enters the receiver 21. With further movement of the spool 6, the hole 10 of the described pipe 11 is combined with the channel 15 and the curved diffuser 16. Due to residual pressure in the receiver 21, the gas with expansion and cooling passes through the pipe 11, the curved diffuser 16 and the chamber 3 of the housing 1 made in the form of an annular diffuser, from which it is discharged through the pipe 8. It should be noted that, unlike the closest analogue, regardless of the location of the pipe 11 the beam and the position of the spool 6, the gas enters the chamber 3 to the sections of the diffuser with the same cross section, which provides the same conditions for the expansion and cooling of the gas. Then, the volume of the pipe 11 is repeatedly cut off with the back compression of the residual gas, after which the cycle of the pipe 11 is repeated. The presence of paired protrusions 23 and depressions 24 provides a labyrinth seal of the movable joint of the spool 6 and the housing 1 and prevents the radial flow of gas from the channels 14 into the channels 15 of the spool 6, which reduces the likelihood of inaccurate shapes of the parts of the movable joint on the uniformity of gas cooling.

Claims (2)

 1. A method of cooling a gas, including periodically alternatingly connecting each of the set of pulsation pipes with a spool, cutting off the volume of the pulsating pipe and displacing the gas into the receiver with expansion and cooling, connecting the pulsation pipe with curved diffusers placed in the spool to discharge gas from the receiver with expansion and cooling, passing gas through an annular diffuser with expansion and cooling, and venting cold low-pressure gas while cutting off the volume of the pulsation pipe with Ratnam compressed residual gas, characterized in that discharged from each of the pulse tube gas is expanded and cooled under the same conditions with the same annular diffuser section.  2. A pulsation gas cooler comprising a housing with high and low pressure chambers, a bundle of constant volume pulsation tubes with separated cold and hot zones confuser-diffuser channels, a receiver and a recuperative heat exchanger connected to the hot zone through a gas-dynamic check valve and a gas distributor connected to the "cold" zone with inlet channels alternately located in the spool in communication with the housing high pressure chamber and outlet channels made in the form of curved diffusers directed from the entrance to the end of the spool to the exit tangentially to its peripheral surface, in communication with the low-pressure chamber housing made in the form of an annular diffuser enclosing the spool, characterized in that the diffuser is made with the same cross section, and the valve body and the valve body are made at least with at least one pair of coaxial annular protrusion and annular cavity, combined with the formation of a running clearance.