Method for uniformizing mixed gas

Abstract

To provide a method for uniformizing a mixed gas that achieves a uniform mixed gas through agitation of gas that has been separated by standing.SOLUTION: A method for uniformizing a mixed gas is configured as follows: a standing buffer tank 101 is piped to a CO2 recovery unit and a methanation reactor; a mixed gas of CO2 and hydrogen is temporarily stored in the standing buffer tank 101; a gas circulation pump 102 is used to suck gas from an upper section 111 of the standing buffer tank 101; and the sucked gas is returned to a lower section 112 below the upper section in the direction of gravity.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for homogenizing a mixed gas.

Background Art

[0002] Patent Document 1 describes a gas mixing and dilution system in which a mixed gas stored in a buffer tank is introduced into a gas introduction pipe before adjusting the mixed gas in the buffer tank, and the mixed gas is circulated.

[0003] On the other hand, there is a buffer tank for a mixed gas of CO2 and hydrogen between the CO2 recovery device and the methanation reactor in the methanation process. When the methanation facility is stopped and the mixed gas in the buffer tank is allowed to stand, due to the large specific gravity difference between CO2 (molecular weight 44) and hydrogen (molecular weight 2), hydrogen accumulates at the upper part of the buffer tank and CO2 separates and accumulates at the lower part by gravity.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Thus, when a mixed gas with a specific gravity difference of 22 times is allowed to stand, there is a problem that it is easily separated by gravity.

Means for Solving the Problems

[0006] In one embodiment of the method for homogenizing a mixed gas, the gas at the upper part of the buffer tank and the lower part of the buffer tank are circulated.

Effects of the Invention

[0007] The method for homogenizing a mixed gas according to the present disclosure can stir the gas separated by standing to form a uniform mixed gas.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0009] The present embodiment Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 is a top view and a cross-sectional view showing a schematic configuration of an apparatus used in the method for homogenizing a mixed gas according to the present embodiment.

[0010] In FIG. 1, the apparatus 100 includes a static buffer tank 101 and a gas circulation pump 102.

[0011] The static buffer tank 101 is a tank connected to the CO2 recovery unit and the methanation reactor by piping. The static buffer tank 101 is used to temporarily store the mixed gas of CO2 and hydrogen until it is sent to the methanation reactor.

[0012] The gas circulation pump 102 is a pump that sucks gas from the upper part 111 of the static buffer tank 101 and returns the sucked gas to the lower part 112 below the upper part 111 in the direction of gravity.

[0013] As shown in the top view of FIG. 1, the positions where the gas circulation pump 102 returns gas to the lower part 112 of the static buffer tank 101 are, for example, two opposing positions. By returning gas from the two opposing positions, the gas airflow collides and disperses, promoting the mixing of CO2 and hydrogen.

[0014] Thus, according to the method for homogenizing the mixed gas of the present embodiment, by circulating the gas above the buffer tank and the gas below the buffer tank, the gas separated by standing is stirred to form a uniform mixed gas.

[0015] Note that the present invention is not limited to the above embodiment, and can be appropriately modified without departing from the gist.

[0016] For example, as long as the position where the gas circulation pump 102 returns the gas to the lower part 112 of the static buffer tank 101 is a positional relationship where the airflows can collide inside the static buffer tank 101, there may be three or more positions.

[0017] FIG. 2 is a top view showing a schematic configuration of an apparatus used in the method for homogenizing the mixed gas according to the present embodiment.

[0018] As shown in the upper diagram of FIG. 2, two sets of airflows returning the gas from two opposing positions may be formed using four pipes.

[0019] Also, as shown in the lower diagram of FIG. 2, one set of airflows returning the gas from two opposing positions may be formed using three pipes.

[0020] That is, the number of pipes and the number of positions where the airflows collide inside the static buffer tank 101 are not limited.

[0021] Thus, according to the method for homogenizing the mixed gas of the present embodiment, inside the buffer tank, due to the collision of the gases, the moving directions of the gases are dispersed in multiple directions, and the homogenization of the separated gases can be achieved in a shorter time.

[0022] Also, a plate for causing the airflows to collide may be provided inside the static buffer tank 101. FIG. 3 is a top view and a cross-sectional view showing a schematic configuration of an apparatus used in the method for homogenizing the mixed gas according to the present embodiment.

[0023] As shown in FIG. 3, the plate 103 is provided at a position where the air flow collides inside the stationary buffer tank 101.

Explanation of Signs

[0024] 100 Device 101 Stationary buffer tank 102 Gas circulation pump 103 Plate

Claims

【Claim 1】 CO ２ is connected to a recovery unit and a methanation reactor by piping, and CO ２ and a hydrogen mixed gas are temporarily stored in a static buffer tank, A method for homogenizing a mixed gas using a gas circulation pump that sucks gas from the upper part of the stationary buffer tank and returns the sucked gas to the lower part below the upper part in the gravitational direction.

Images