Method and device for vortex liquefying

FIELD: processes or apparatus for liquefying.

SUBSTANCE: method comprises flowing gas through one or two recuperative heat exchangers connected in series where the gas cools and low-boiling components are condensed and frozen, flowing the gas through a gas-expansion machine and/or an air throttle to the cold receiver. A part of the straight gas flow is branched into the cold and hot flows inside the energy separator made of, e.g., a two-flow vortex pipe. The cold flow is mixed with the return flow at the inlet to the heat exchanger. The hot flow is directed to the straight passage of the nonoperating recuperative heat exchanger-freezer.

EFFECT: enhanced efficiency.

2 cl, 3 dwg

 

The invention relates to the field of creating cooling and sijoumi devices running on the properties of the expanding gas flow in the vortex cooling devices in the so-called vortex tubes [1].

The known method of operation of the vortex siraudeau (cooling) devices, including the transmission of direct gas flow through one or two series-connected recuperative heat exchanger where the cooling gas, condensation boiling components and the freezing, flow through pneumatocele in hallodapini, and part of the live stream is directed to a double-flow vortex tube, in which the gas is expanded and divided into hot and cold streams, while the cold stream is mixed with reverse flow at the inlet of the heat exchanger [2].

This method is implemented in the structure described in the patent [2], according to which well-known vortex sizeuse the device includes a separator gas stream, one or two series-connected recuperative heat exchanger with the forward and reverse channels, pneumatocele, hallodapini and extender made in the form of one or more series-connected two-line pipe cold pipe which is connected to the input pipe reverse flow regenerative heat exchanger.

Since the input is such vortex siraudeau devices almost always comes undrained (wet) gas, when the temperature is below K inside channel live stream (channel high pressure regenerative heat exchanger will inevitably numerate moisture and associated heavy gas fraction, which form solid hydrates (hereinafter simply "ice"), which leads to a gradual decrease of the effective cross section of the channel, reducing the effective area of heat transfer, reduction of thermal conductivity of the surface of the channel and, as consequence, to decrease the performance of the entire device. Ultimately, if you do not take relief measures, may occur even plugging this channel.

This is a flaw.

Usually formed inside the channel, the ice is removed by periodic heating of the entire heat exchanger, for example by blowing backward channel non-refrigerated gas coming from the inlet pipe, connected to the high pressure pipeline. Therefore, the operation of such a vortex siraudeau device inevitably accompanied by periodic stops for melting the ice formed inside the channel. To reduce the time required for the defrost to reduce downtime installation) recuperative heat exchanger is duplicated to the other, in exactly the same heat exchanger-wykorzystaniem included in the work for the period defrost first heat exchanger.

But what is the temperature of the gas, input device of trunk pipelines, often does not exceed 5...10°that is obviously not enough for effective defrosting. In addition, using a purge gas of high pressure, we are forced to throttle, which further reduces its temperature. Yes, also, this gas has a high humidity. This further reduces the effectiveness of this method of defrosting.

This is a flaw.

To defrost any heat exchanger-memoratives it can blow the hot stream from the vortex tube included with the device for cooling the patent [2]. This hot gas can be fed or otherwise, or in the direct channel.

Although the temperature of the gas leaving the hot end of the vortex tube, can be quite high (50...70°and more) and this gas is able to melt the accumulated ice in the dead heat exchanger, but in the process of thawing, when the hot gas in the reverse channel, we will have to heat the entire mass of metal of the heat exchange channels (for example, the whole mass of tubes in wit the heat exchanger), all tube plate and the housing, etc., i.e. virtually all of the heat exchanger. For example, it is known that annealing in this way the heat exchanger mass 2000 kg to ambient temperature requires not less than 1,0...1,5 hours. In addition to the, for commissioning otogretogo heat exchanger need it again all over cooling, which will need to spend a considerable amount of cold that the entire process will require a significant amount of time - again, at least as stated 1,0...1,5 hours.

Therefore, the most rational hot flow vortex tube feeding in the direct channel is disabled from operation of the regenerative heat exchanger-memoratives.

The technical result of the present invention is to reduce these disadvantages.

The technical result in part of the way we get due to the fact that the hot stream of energoizmeritel sent to the direct channel is disabled from operation of the regenerative heat exchanger-memoratives.

The technical result in part of the device is obtained due to the fact that the hot pipe energoizmeritel connected to the direct channel is disabled from operation of the regenerative heat exchanger-memoratives.

Figure 1 illustrates the invention.

Inlet pipe 1 through the tee-separator 2 through the two-way valve-switch 3 and tee 4 is connected to the input of the direct channel 5 recuperative heat exchanger-memoratives 6, which through the separator 7 through the two-way valve switch 8 is connected to the input of the direct channel 9 of the second heat exchanger 10. The output of the direct channel 9 che is the ez pneumatocele 11 is connected with a vessel-drive (haldoperidol) 12, having gas and liquid cavity. Top (gas) cavity hallodapini 12 through the channel of the reverse flow 13 of the heat exchanger 10 through the two-way valve switch 14, through the channel of the reverse flow heat exchanger 15 6 and through the tee 16 is connected to the output 17 of the vortex siraudeau device. In addition, the separator 7 is connected to the fluid collector 18, also having gas and liquid cavity. The gas passage of the fluid collector 18 is connected to the collector of heavy gas fractions (not shown in figure 1).

With tee-separator 2 is connected to the inlet 19 of the double-flow vortex tube 20, which is still hot 21 and 22 cold ends (sockets). Hot end 21 through the two-way valve switch 23 and the tee 24, through the direct channel 25 of the second heat exchanger-memoratives 26 alternate heat exchanger-memoratives 6, through the separator 27 is connected to the fluid collector 28, also having gas and liquid cavity. The gas passage of the fluid collector 28 is connected to the collector of heavy gas fractions (in the figure, this collection also not shown).

The heat exchanger-vigorazhival 26 is temporarily disabled from work using the respective two-way valves switches 3, 8, 14 and 23. While derived from the connection operation forward and reverse channels of the heat exchanger-memoratives 26 figure 1 and heat exchanger-vimo is uivatele 6 figure 2 shows a dotted line. Contours supplied to the defrosting heat exchanger-memoratives 26 figure 1 and figure 2 also indicated by the dotted line. In addition, the dashed line shows temporarily disturbed from work with crane-switch 23 connecting the hot end 21 of the vortex tube with tee 4.

The cold end 22 of the vortex tube 20 through the two-way tap switch 14 may be connected or to the input of the reverse channel 15 of the heat exchanger 6, and then, through the tee 16 output 17 of the vortex siraudeau device or to the input of the reverse channel 29 of the heat exchanger 26 and then through the tee 16 with the output 17 of this device.

Consider the device for realization of the proposed method works as follows (see figure 1).

Through the inlet 1 into the tee-separator 2 receives the compressed gas in the initial thermodynamic state.

In the t-separator 2, the gas is divided into two streams:

the first (direct) flow through the two-way valve-switch 3 and tee 4 is fed to the input of channel 5 live stream recuperative heat exchanger 6;

the second stream is fed to the input 19 of the vortex tube 20.

The first (direct) stream passing through the channel 5 live stream recuperative heat exchanger 6, wholived from the cold return flow 15.

During operation of the cooling device in the normal cooler (what if in the run mode of the liquefier) gas temperature in the direct channel 5 does not fall below C, therefore, the moisture just condensed into this channel and the output from it can be extracted in the usual separator (air dryer or desiccant). This separator can be mounted separate from the heat exchanger by node 7 or combined in one design with the output (lower) part of the channel 5.

During operation of the cooling device of the liquefier temperature of the gas in the direct channel 5 heat exchanger 6 is lowered significantly below C, so the moisture condenses from the gas, immediately freezes on the inner surfaces of the heat exchanger, gradually clogging the channel 5 and reducing its cross-section, which adversely affects the performance of the entire device for cooling. Therefore, the operation of the liquefier inevitably accompanied by periodic stops for melting the ice formed inside the channel 5.

To ensure continuity of all the heat exchanger-vigorazhival 6 duplicate exactly the same heat exchanger-wykorzystaniem, for example, heat exchanger 26, and periodically switch their special valves (two-way valves switches), giving time for thawing the internal ice. For the period of temporary stop order defrost heat exchanger-memoratives 26 direct channel 25 through the two-way valve switch 23 and the tee 24 blow warm the compressed gas from the hot end 21 of the vortex tube 20, and the output is collected formed the moisture in vlagooborote 28, preventing it from falling into the main channels siraudeau device. Therefore, when the purge direct channel 25 and the separator 27 are cut off from the main part of the device using the two-way valves switches 3, 8 and 14. Spin-off from the melting of gas hydrates heavy gas fraction after the separator 27 and blagozvonnitsa 28 are reset at the beginning in the fluid collector 18, and then in the collection of heavy gas fractions (not shown).

After thawing recuperative heat exchangers-defrosters using system mounted switches 3, 8, 14 and 23 change modes (see figure 2). So there is continuity of operation of the device to cool.

In the case of operation in the low-temperature liquefaction of natural gas separator (outer 7 or located inside the heat exchanger) is not only outside of time, i.e. when the defrosting of the heat exchanger 6 for removal of formed water, but in the main period of work, he can be useful in the case of the presence in the gas of heavy fractions, such as the presence of propane-butane-pentanol mixture in a cooled or liquefied natural gas, and which will begin to condense before the main gas (methane). This pre-separator separates the heavy liquid fraction (including getcontents is), which are collected in vessel-drive 18 from which a gaseous fraction is removed. This allows to improve the quality (uniformity of the composition of the gas mixture fed to the liquefaction through pneumatocele 11 in a fluid collector (headpriest) 12.

After the gas separator 7 live stream passes through the two-way valve switch 8, through the channel 9 live stream of the heat exchanger 10 and pneumatocele 11, and then enters hallodapini 12 (vessel-drive liquid gas).

In the direct channel 9 of the heat exchanger 10, the gas is further cooled against back-flow 13, which represents a low-flow low-pressure neskondensirovannyh in the vessel 12 gas. In pneumatocele 11 cold gas is choked and much douglasdale, so there are formed two phases, liquid and gaseous. In doing hallodapini 12 (vessel-drive), two-phase flow split:

cryogenic liquid accumulates at the bottom, and very cold gaseous phase goes up, goes through the reverse channel 13 of the heat exchanger 10, vyhrazena stream 9 passes through the two-way valve switch 14 where it mixes with the cold stream from the vortex tube 20 passes through the return channel 15 of the heat exchanger 6, where it is heated by direct flow 5 and wholived it. In this state, reverse flow output 17 is igrovogo siraudeau device.

The second stream is fed to the input 19, in the vortex tube 20 is divided into two streams:

- hot 21 having a high temperature and flowing through the two-way valve switch 23 in the tee 24, and then enters into a direct channel 25 of the heat exchanger 26 and defrost the ice inside him;

- and cold 22 having a lower temperature and flowing through the two-way valve switch 14 in the reverse channel 15 of the heat exchanger 6.

Figure 2 shows the same device for cooling, but switched to the defrosting is extracted from the heat exchanger-memoratives 6 (shown dashed), and instead the heat exchanger-vigorazhival 26 included in the main work. However after switching the two-way valves switches 3, 23, 14, and 8 direct flow from input 1 goes in a different way: tee 2, tap 3, the tee 24, the channel 25 of the direct flow of heat exchanger 26, the separator 27, the valve 8, channel 9 live stream of the heat exchanger 10 and through pneumatocele 11 - in refrigerator 12, where the reverse flow through the channel 13 of the heat exchanger 10, through two-way faucet-smesitel 14 where it mixes with the cold stream from the vortex tube 20, through a return channel 29 of the heat exchanger 26, through the tee 16 is reset on the output 17 of the vortex siraudeau device.

Warm gas from the hot end 21 of the vortex tube 20 passes through the valve 23, through rojnik 4 comes into direct channel 5 heat exchanger 6 and defrost the ice inside it. Thawed moisture through the air dryer 7 flows into the vessel drive 18. In this case, the heating is only subjected to ice inside channels live stream 5 (or 25), which greatly reduces the effect of heat flux on other elements of the heat exchangers.

The work of the vortex siraudeau device of figure 1 and 2 is possible without heat exchanger 10, such as one incorporated into the heat exchanger-wykorzystaniem 6 (or 26) and one derived from heat exchanger-wykorzystaniem 26 (or 6).

Hot flow vortex tube can be fed from either side of the direct channel of the heat exchanger is either input or output.

As pneumocystitis can be used not only pneumatocele 11, but the combination of the expander 30 with pneumatoceles 11, as shown in figure 3. This 31 - load expander.

In addition, as energoizmeritel can be used not only one vortex tube, but several are connected in series vortex tubes [1, c.111].

Thus, the hot flow in a straight channel of the heat exchanger-memoratives reduces the time required to defrost, as well as reduce the time and energy needed to put into operation after defrosting. This is the technical essence of the invention.

This technique allows about is especial greater stability of operation of the device for cooling (liquefaction) under the patent [2].

The literature taken into consideration

1. Merkulov A.P. Vortex effect and its application in engineering. M: mechanical engineering, 1969.

2. Arturo SV and other Method of operation of the device for cooling and the cooling device. RF patent №2149324 from 26.03.1996,

1. The way eddy fluidizing device, including the transmission of direct gas flow through one or two series-connected recuperative heat exchanger where the cooling gas, condensation boiling components and the freezing, flow through pneumomechanical, for example through the expander and/or pneumatocele, hallodapini, and the portion of the direct flow away in energonuclear (made for example in the form of a double-flow vortex tube), in which the gas is divided into hot and cold streams, while the cold stream is mixed with reverse flow at the inlet of the heat exchanger, wherein the hot stream of energoizmeritel direct direct the channel is disabled from operation of the regenerative heat exchanger-memoratives.

2. Vortex the fluidizing device containing the separator gas stream, one or two series-connected heat exchanger, one of which is the regenerative heat exchanger-wykorzystaniem equipped derived from a backup, the same recuperative heat exchanger is m-wykorzystaniem, energonuclear (made, for example in the form of a vortex tube), cold pipe which is connected to the input of the reverse channel of the heat exchanger, and pneumomechanical made, for example, in the form of a throttle, and hallodapini, characterized in that the hot pipe energoizmeritel connected to the direct channel is disabled from operation of the regenerative heat exchanger-memoratives.



 

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