JPS58170524A - Method for starting operation of gas separating cascade - Google Patents

Abstract

PURPOSE:To provide a method for operating a gas separating cascade shortening an operation start time and reducing the amount of a gas to be separated until rated operation. CONSTITUTION:When there is such property that the greater part of a gas to be separated is flowed out from a waste material port 5 until a rated operation is attained, the greater part of the gas supplied to a separation stage 3 is flowed to the separation stage of a decrease side in the initial supply period of the gas to be separated. From this phenomenon, a gas is guickly accumulated in a gas separator within a range from a stage supplying the gas to be separated to the separation stage of the decrease side while, in the separation stage of a concn. side, the gas is accumulated from a stage near to the supply stage of the gas to be separated and, therefore, a time is required as compared to the stage of the decrease side. When the gas to be separated is directly supplied also to the specific separation stage 4 of the concn. side privided that operation is started, a time required in accumulating the gas in the separation stages between said specified separation stage 4 and the separation stage of the decrease side is shortened to a large extent. As the result, the operation start time of a gas separation cascade can be shortened to a large extent.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for starting a gas separation cascade.

A gas separator is known as a device that separates a mixed gas consisting of an electric component and a light gas component into each component gas. However, in order to separate each component gas at a higher rate, a gas separation cascade is used in which a plurality of separation element stages each having gas separators connected in parallel are connected in a cascade. A gas separation cascade thus consists of several stages of separation elements, ie separation stages, and groups of pipes connecting them. Each separation stage has three entrances: a supply port, a production port, and a waste port. The supply port is an inlet for the gas to be separated, the production port is an outlet for the separated light component gas, and the waste port is the outlet for the light component gas, which is diluted. The production port of separation stage N is connected to the supply port of separation stage N+1, and the waste port is connected to separation stage N-.
It is connected to the supply port of 1. Also, all the separation stages are connected in a cascade manner, such that the waste inlet of separation stage N+1 and the production inlet of separation stage N-1 are connected to the supply inlet of separation stage N. Further, a supply port pipe for supplying the gas to be separated is connected to the supply port separation stage.

However, when the gas separation cascade is activated, the gas to be separated supplied from the feed pipe may flow toward the production port or the first port. In this case, it takes a long time to start up until the rated operation is achieved, and the gas to be separated until the rated operation is achieved is not used as a product and is wasted, so it is necessary to reduce the amount of separation.

The present invention has been made in view of these circumstances, and its purpose is to provide a method of operating a gas separation cascade that shortens startup time and reduces the number of gas separation caps required until one rated operation is achieved. It's about doing.

The details of the present invention will be explained below with reference to an illustrated embodiment.

In the drawing, the supply pipe 1 is branched in the middle so that the gas to be separated can be supplied via a valve 2 to another separation stage 4 different from the supply separation stage 3.

Next, the present invention will be explained in detail. If there is a property that most of the gas to be separated flows out from the monster port 5 until the rated value is reached, most of the gas supplied to the separation stage 3 will accumulate on the lt4 extraction side at the beginning of the gas to be separated. However, in the separation stage on the enrichment side, gas accumulates in the separator in order from the stage closest to the supply stage of the fraction A, so it takes more time than in the stage on the depletion side. Therefore, if we decide to directly supply the starting gas, separation stage 4
However, the time that gas accumulates in the separation stage up to the depletion side stage is significantly shortened. As a result, although it depends on how the separation stage 4 is selected, the start-up time of the gas separation cascade can be significantly shortened. Once the starting operation is completed, the valve 2 may be closed and normal operation resumed.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be configured such that most of the gas to be separated can connect with the supply gas until the rated value is reached.

Note that 4a is a separation stage, 2a is a valve, and 1a is a supply port.

As described above, according to the present invention, the gas to be separated can be supplied not only from the normal supply stage 3 but also from other sources, so even if the gas flow is uneven, the gas to be separated can be stored and stored quickly.
The amount of gas to be separated at startup is also small, and startup time can be shortened.

[Brief explanation of drawings]

The drawing is an explanatory diagram of a gas separation cascade showing one embodiment of the present invention. 1 Supply piping 2 Valve 3.4 Separation stage Customer Separation stage (7317)
Agent: Patent attorney Keisuke Chika (and 1 other person)

Claims (1)

[Claims] A separation element stage in which a plurality of gas separators are connected in parallel, a separation element in which a plurality of these separation element stages are connected in cascade, and a feed pipe that connects a gas to be separated to one separation element stage of the separation element; A killing supply piping that branches off from the middle of this feed piping and supplies gas to be separated to another separation element stage different from the primary feed piping via a valve, and a valve for the other stage connecting piping are opened to wait for startup. A method for starting a gas separation cascade characterized by temporarily connecting gas to be separated.