JPS5930126B2 - Separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separation device configured by connecting a plurality of gas separators in cascade, and in particular, even if some of the separators fail, good cascade efficiency can be obtained, and the system is simple. This invention relates to a separation device devised to create a cascade piping structure.

The separation capacity of one gas separator that separates a mixed gas consisting of heavy and light components, that is, the concentration and processing flow rate that can be obtained with one gas separator, are small values, and the required concentration and processing flow rate are small. In order to obtain throughput, a separation device (hereinafter referred to as a blade skate) is used in which a number of gas separators are connected in a cascade.

FIG. 1 shows the cascade configuration.

A plurality of gas separators 5 are connected in parallel via three headers, that is, a protect header 6, a feed header 7, and a waste header 8 to form one stage.

The separator 5 and each header are connected to connecting pipes 9, 10, and 1, respectively.
Connected with 1.

A plurality of these stages are cascaded in series to obtain the required concentration.

If the upper stage of the first stage is the i+1 stage and the lower stage is the i-1 stage, these stages are connected to each other as shown in Figure 1, and the gas flows in the directions shown by the arrows in the figure. It is configured so that

That is, the gas to be separated is introduced into the first stage feed header F, the first stage product header P is connected to the (i-11) stage feed header F, and the west header W is connected to the (i-1) stage feed header F. Connect to the second feed header F and also (
The i+1)th stage west header W and the (i-1)th stage product header P are connected to the first stage feed header F.

In this way, the west header W, product header P, and feed header F of each stage are connected in the relationship described above.

Therefore, when the gas to be separated is introduced into the feed header F of the first stage, the product flow sequentially moves from the first stage to the upper stage side while being concentrated, and as a result, a higher rate of gas separation can be achieved.

Control valves 1 to 4 are provided between each stage so that the gas flow rate between the stages can be adjusted to a predetermined value.

The pressure of P, E, and W each is PSP"SF'"
If PSW is used, the 5P and W header pressures should be set to a higher value than the F header pressure so that the pressure difference required by the control valve can be obtained.

In such a case, a fixed orifice or the like may be used as a resistance element instead of a control valve between stages that do not require a control valve.

A cascade configured in this way has the following problems: (1) If one of the separators fails, the cascade efficiency may decrease.

(2) The cascade phototube configuration may become complicated.

(1) will be explained with reference to FIGS. 2 and 3.

Figure 2 shows the gas flow when there is a faulty separator in the crotch.

In the normal separator 5A, gas is supplied from the feed header 7 to the separator, and the separated gas is taken out from the separator to the product header 6 and the waste header 11.

Such a flow is normally generated by the pumping power of the separator.

On the other hand, in the failed separator 5B, such pumping power is lost, so if the header pressure P of P and W is set to a higher value than the pressure P of the F header, this pressure difference will result in the difference shown in Fig. 2. A gas flow like this occurs, and the P and W separated in the normal machine mix, and the separation as a stage is impaired.

Figure 3 shows this situation, with the pressure difference P-PP-P8F between the P and W headers and the F header plotted on the horizontal axis, and the cascade efficiency η when there is a faulty machine.

As is clear from this figure, PSP -PSF"5W-
It can be seen that when PSF exceeds 10% of the feed header pressure P, the cascade efficiency η decreases.

Regarding (2), since a control valve or orifice is provided between the stages, this part becomes complicated when manufacturing the piping, and an instrumentation device is also required to control the control valve. .

An object of the present invention is to provide a separator that is devised so that good cascade efficiency can be obtained even if some of the separators fail, and the cascade piping is simple.

For this reason, in a separation device configured by connecting multiple gas separators in parallel via headers and cascading multiple stages in series, the pressures of the Mitsweed, Product, and West headers are respectively P P P
In this case, SF'SP' 5W PPP is defined as SF'SP' SW P -P <O, IP SP SF' SFゝP -P
<0. The separation device was set to be IP SW SF SF.

In other words, in order to prevent the cascade efficiency from decreasing even if a malfunction occurs in the cascade, the pressure difference P -Pp -p between the P and W headers and the F header should be kept to about 10% or less of the F header pressure P8F. That's fine.

Furthermore, if the header pressure is set in this manner, resistance elements such as regulating valves or orifices, which were conventionally provided between stages, become unnecessary, and the cascade piping becomes extremely simple.

The fourth example schematically shows such an embodiment of the present invention.
It is a diagram.

In the above description, the separator 5 is one separator, but it goes without saying that it may be a separator unit in which a plurality of separators are connected in parallel through subheaders.

In this case, it goes without saying that the gist of the present invention is also applied to the pressure setting of each subheader.

According to the present invention, since the header pressures of P, E, and W are set to be approximately equal, good cascade efficiency can be obtained even in the event of a failure, and the cascade piping can be simplified.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the cascade configuration, Figure 2 is a diagram explaining the flow of crotch gas when there is a malfunctioning machine, Figure 3 is a diagram showing separation efficiency, and Figure 4 is a diagram showing the separation efficiency. 3 is a schematic diagram showing an example of a cascade configuration in the case where L2, 3, 4... Control valve, 5, 5A, 5B...
... Gas separator, 6 ... Grooduct header, 7 ... Feed header, 8 ... West header, 9.10, 11 ... Connection Piping.

Claims (1)

[Claims] 1. In a separation device constructed by cascading a plurality of stages in series, each of which is constructed by connecting a plurality of gas separators in parallel via headers, the pressure of each of the feed, product and waste gases is controlled. are P, PP, respectively, then P8F, SF SP' 5W PP is sp sw P -P 〈0. IP8F, SP SF P-P <0. A separation device characterized in that it is set to be IP SW SF SF.