Gas treatment equipment

Abstract

To provide a gas treatment apparatus which efficiently separates and recovers recovered gas in treatment in a gas to be treated with less energy by a simple structure.SOLUTION: A gas treatment apparatus has: a treatment tower which stores a treatment liquid, and has a nozzle for blowing a gas to be treated into the treatment liquid provided on its lower part; a regeneration tower which has a heating device provided on its upper part, and a cooling device provided on its lower part; an upper communication pipe for communicating the upper part of the treatment tower and the upper part of the regeneration tower with each other; and a lower communication pipe for communicating the lower part of the treatment tower and the lower part of the regeneration tower with each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an apparatus for separating and recovering a specific gas component such as carbon dioxide (hereinafter referred to as "recovered gas") from a gas to be treated such as exhaust gas.

Background Art

[0002] Since carbon dioxide is a greenhouse gas that causes global warming, technologies for separating and recovering carbon dioxide from combustion gases and the like have been studied. In Patent Document 1, a gas to be treated and a lean absorbent capable of absorbing carbon dioxide gas are brought into contact in an absorption tower, and the carbon dioxide gas in the gas to be treated is absorbed by the lean absorbent to generate a rich absorbent. A carbon dioxide gas recovery apparatus is disclosed in which the rich absorbent is heated in a regeneration tower to separate and recover carbon dioxide as a gas.

[0003] In the above apparatus, an aqueous solution such as isopropanolaminoethanol is used as the absorbent. When the gas to be treated is brought into contact with the absorbent in the absorption tower, carbon dioxide gas is selectively absorbed by the absorbent to become a rich absorbent. Next, when this rich absorbent is heated in the regeneration tower, carbon dioxide in the rich absorbent is separated as a gas, and this separated carbon dioxide gas is recovered.

[0004] In addition, as a treatment liquid for absorbing carbon dioxide from the gas to be treated and separating it as a solid precipitate, there are isophoronediamine and an aqueous solution of calcium hydroxide. When using these treatment liquids, it is conceivable to separate carbon dioxide as a solid precipitate, heat this solid precipitate by batch treatment to decompose it, and recover carbon dioxide gas.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the technology described in Patent Document 1 above, since carbon dioxide is absorbed into the lean absorbent, it is necessary to send all of the rich absorbent containing the absorbent carbon dioxide to a regeneration tower, heat it, and separate the carbon dioxide. This leads to problems such as the absorption tower and regeneration tower becoming large and the equipment becoming complex. There is also the problem that a lot of energy is consumed in moving and heating the rich and lean absorbent.

[0007] Furthermore, while miniaturization of processing equipment is expected when separating carbon dioxide as a solid precipitate, there are challenges in improving processing efficiency because the decomposition of the solid precipitate is done in batches.

[0008] The purpose of this disclosure is to provide a gas treatment apparatus that has a simple structure and efficiently separates and recovers the gas to be recovered from the gas to be treated with little energy. [Means for solving the problem]

[0009] The gas processing apparatus of the present disclosure is provided with a nozzle at the bottom that contains a processing liquid and blows the gas to be processed into the processing liquid. , extending in the vertical direction The processing tower has a heating device at the top and a cooling device at the bottom. , extending in the vertical direction The system comprises a regeneration tower, an upper connecting pipe connecting the upper part of the processing tower to the upper part of the regeneration tower, and a lower connecting pipe connecting the lower part of the processing tower to the lower part of the regeneration tower. Furthermore, an exhaust port is formed at the top of the processing tower for discharging the processed gas, and a recovery port is formed at the top of the regeneration tower for recovering the gas separated from the processed gas. . [Effects of the Invention]

[0010] According to the gas treatment apparatus of this disclosure, a treatment liquid containing a reactive component that reacts with the gas to be recovered in the gas to be treated and precipitates as a solid precipitate is introduced into a treatment tower and a regeneration tower. When the gas to be treated is blown into the treatment liquid from a nozzle and brought into contact with the gas to be treated, the gas to be recovered reacts with the reactive component in the treatment liquid and precipitates as a solid precipitate. In the treatment liquid in the treatment tower and regeneration tower, a circulating flow is generated as the bubbles of the gas to be treated blown in from the nozzle rise, causing the liquid to rise in the treatment tower, move through the upper connecting pipe into the regeneration tower, descend in the regeneration tower, and return to the bottom of the treatment tower through the lower connecting pipe. The solid precipitate deposited in the treatment liquid is carried by the flow of the treatment liquid to the top of the regeneration tower, where it is decomposed by heating from a heating device, and the gas to be recovered is separated and recovered. The remaining treatment liquid from which the gas to be recovered has been separated is cooled at the bottom of the regeneration tower and returned to the bottom of the treatment tower, where it comes into contact with the gas to be treated again. In this way, there is no need to install a device to send the processed liquid from the processing tower to the regeneration tower, the processing equipment can be made smaller, and the recovered gas can be separated and recovered continuously with energy efficiency. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram of a gas treatment device. [Modes for carrying out the invention]

[0012] Embodiments of the present disclosure will be described below with reference to the drawings. Figure 1 is a schematic diagram showing an example of a gas treatment apparatus 1 of the present disclosure. The gas treatment apparatus 1 includes a treatment tower 10, regeneration towers 20-1 and 20-2, upper connecting pipes 22-1 and 22-2 that connect the upper parts of the treatment tower 10 and the regeneration towers 20-1 and 20-2, and lower connecting pipes 24-1 and 24-2 that connect the lower parts of the treatment tower 10 and the regeneration towers 20-1 and 20-2.

[0013] A nozzle 12 is provided at the bottom of the processing tower 10 for injecting the gas to be processed, such as exhaust gas, into the processing tower 10. The injection holes of the nozzle 12 are configured to inject the gas to be processed from numerous small holes so that the gas to be processed is injected as fine bubbles.

[0014] An exhaust port 14 is formed at the top of the processing tower 10 for discharging the treated gas, and recovery ports 26-1 and 26-2 are formed at the top of the regeneration towers 20-1 and 20-2 for discharging and recovering the separated recovered gas.

[0015] Heating devices 28-1 and 28-2 are provided at the connection points between the upper regeneration towers 20-1 and 20-2 and the upper connecting pipes 22-1 and 22-2, respectively, and cooling devices 30-1 and 30-2 are provided at the lower part of the regeneration towers 20-1 and 20-2. Heating devices 28-1 and 28-2 are for thermally decomposing the precipitated solid material. The heating temperature depends on the type of gas and liquid being treated, but when carbon dioxide is precipitated as a solid material using an aqueous solution of isophorone diamine, it is preferable to heat to approximately 60 degrees Celsius.

[0016] The processing tower 10, regeneration towers 20-1 and 20-2, upper connecting pipes 22-1 and 22-2, and lower connecting pipes 24-1 and 24-2 are filled with processing liquids 16, 32-1, and 32-2, respectively, for absorbing the gas to be recovered from the gas to be processed and separating it as a solid precipitate. When the gas to be processed is combustion gas and the gas to be recovered is carbon dioxide, isophorone diamine or an aqueous calcium hydroxide solution can be used as the processing liquid. The processing liquids 16, 32-1, and 32-2 are appropriately selected and used depending on the type of gas to be recovered to be absorbed.

[0017] Next, the operation of the gas treatment device 1 will be explained. With the treatment tower 10, regeneration towers 20-1 and 20-2, upper connecting pipes 22-1 and 22-2, and lower connecting pipes 24-1 and 24-2 filled with treatment liquids 16, 32-1, and 32-2, the gas to be treated is blown into the treatment liquid 16 from the nozzle 12. Of the blown-in gas to be treated, the gas to be recovered reacts with the treatment liquid and precipitates as a solid precipitate.

[0018] When the gas to be treated is blown into the treatment liquid 16, the bubbles of the gas to be treated rise in the treatment liquid 16, causing a circulating flow in the treatment liquids 16, 32-1, and 32-2 that rises in the treatment tower 10, passes from the upper part of the treatment tower 10 through the upper communication pipes 22-1 and 22-2 to the upper parts of the regeneration towers 20-1 and 20-2, descends in the regeneration towers 20-1 and 20-2, and reaches the lower part of the treatment tower 10 through the lower communication pipes 24-1 and 24-2. The solid precipitates deposited in the treatment liquid 16 ride on the circulating flow of the treatment liquids 16, 32-1, and 32-2, reach the upper parts of the regeneration towers 20-1 and 20-2, and are heated by the heating devices 28-1 and 28-2. The heated solid precipitates are decomposed, and the recovered gas is separated and recovered through the recovery holes 26-1 and 26-2.

[0019] The treatment liquids 32-1 and 32-2 from which the recovered gas has been separated descend in the regeneration towers 20-1 and 20-2, are cooled by the cooling devices 30-1 and 30-2, reach the lower part of the treatment tower 10 through the lower communication pipes 24-1 and 24-2, and come into contact with the gas to be treated again, enabling continuous recovery of the recovered gas.

[0020] In the above embodiment, two regeneration towers 20-1 and 20-2 are provided around the treatment tower 10, but the number of regeneration towers 20-1 and 20-2 is not limited in any way. It can be appropriately changed according to the size of the treatment device 1, the type of gas to be treated, etc.

[0021] In addition to separating carbon dioxide in the exhaust gas, the gas treatment device of the present disclosure is not limited in any way to the gas to be treated or the recovered gas to be separated as long as the recovered gas can be separated as solid precipitates by the treatment liquid.

Industrial Applicability

[0022] It can be suitably applied when separating and recovering the recovered gas from the gas to be treated.

Explanation of Reference Numerals

[0023] [[ID=第25]] 10 Treatment tower 12 Nozzle 14 Discharge hole 16. Treatment solution 20-1, 20-2 Regeneration Tower 22-1, 22-2 Upper communication pipe 24-1, 24-2 Lower communication pipe 26-1, 26-2 Recovery holes 28-1, 28-2 Heating device 30-1, 30-2 Cooling device 32-1, 32-2 Treatment solution

Claims

1. A processing tower extending vertically, containing a processing liquid and having a nozzle at its lower part for injecting the gas to be processed into the processing liquid, A regeneration tower extending vertically, with a heating device at the top and a cooling device at the bottom, An upper connecting pipe that connects the upper part of the processing tower and the upper part of the regeneration tower, A lower connecting pipe that connects the lower part of the processing tower and the lower part of the regeneration tower, It has, An exhaust port is formed at the top of the processing tower for discharging the processed gas. A recovery port is formed at the top of the regeneration tower for recovering the gas to be recovered, which is separated from the gas to be processed. Gas treatment device.

2. Multiple regeneration towers are provided around the processing tower. The gas treatment apparatus according to claim 1.

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