Absorption liquid regeneration device for gas desulfurization

Abstract

The utility model discloses an absorption liquid regeneration device for gas desulfurization, which comprises an upper tower and a lower tower, and a first partition plate and a first clerestory are arranged between the upper tower and the lower tower; a regenerated gas output channel and a rich liquid spraying mechanism are arranged at the upper part of the upper tower, a third structured packing layer is arranged between the regenerated gas output channel and the rich liquid spraying mechanism, a first structured packing layer is arranged between the rich liquid spraying mechanism and the first clerestory, and a bottom cavity of the upper tower is a semi-rich liquid cavity; a semi-pregnant solution spraying mechanism is arranged in the middle of the lower tower, a semi-pregnant solution spraying pipeline is connected between the semi-pregnant solution cavity and the semi-pregnant solution spraying mechanism, a second partition plate, a second clerestory and a second structured packing layer are arranged on the lower portion of the lower tower, a cavity between the second partition plate and the second structured packing layer is a semi-barren solution cavity, and a cavity below the second partition plate is a barren solution cavity; the semi-barren liquor cavity and the barren liquor cavity are connected with a semi-barren liquor conveying pipeline, and a heat exchanger is arranged on the semi-barren liquor conveying pipeline. According to the utility model, the regeneration efficiency of the absorption liquid is improved, and the energy consumption is lower.

Description

Technical Field

[0001] This utility model relates to the field of gas purification technology, specifically to an absorbent regeneration device for gas desulfurization. Background Technology

[0002] Under the current environment of upgraded environmental protection policies, excessively high sulfur content in some industrial exhaust gases or by-product gases can have negative impacts. For example, high levels of H2S in blast furnace gas, a by-product of the metallurgical industry, can form acidic liquids that corrode pipes and equipment; SO2 emitted from industrial exhaust gases can oxidize into sulfuric acid mist or sulfate aerosols, forming acid rain and causing environmental acidification. Therefore, with the continuous upgrading of national environmental protection policies, there are clear constraints on the sulfur content in exhaust gases, requiring that industrial exhaust gases must undergo desulfurization and meet emission standards before being released.

[0003] Currently, the commonly used desulfurization method is to use chemical absorption in large-scale desulfurization equipment. This method involves selectively absorbing sulfur dioxide, organic sulfur, and other substances in the gas using solutions of different types of alkyl alcohol amine compounds, and then releasing sulfides by heating the regenerated solution. This method is inefficient, energy-intensive, and requires a large area. Utility Model Content

[0004] The present invention aims to provide an absorbent regeneration device for gas desulfurization to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: an absorbent regeneration device for gas desulfurization, comprising a regeneration tower, which includes an upper tower and a lower tower, a first partition is provided between the upper tower and the lower tower, a first gas tower is provided on the first partition, and the upper tower and the lower tower are connected through the first gas tower.

[0006] The top of the upper tower is connected to a regeneration gas output channel. The upper part of the upper tower is equipped with a rich liquid spraying mechanism, which is used to spray rich liquid. The rich liquid is a regenerable absorbent liquid that has absorbed sulfides. A third structured packing layer is set between the regeneration gas output channel and the rich liquid spraying mechanism. The third structured packing layer is used to remove the absorbent liquid from the regeneration gas flow. Multiple first structured packing layers are arranged vertically between the rich liquid spraying mechanism and the first gas tower. The bottom chamber of the upper tower is a semi-rich liquid chamber for storing semi-rich liquid. The semi-rich liquid is the rich liquid that has undergone the first regeneration.

[0007] The lower tower has a semi-rich liquid spraying mechanism in the middle. A semi-rich liquid spraying pipe is connected between the semi-rich liquid chamber and the semi-rich liquid spraying mechanism. The semi-rich liquid spraying pipe is located outside the regeneration tower. A second baffle is installed at the bottom of the lower tower. A second gas chamber is installed on the second baffle. A second structured packing layer is installed between the semi-rich liquid spraying mechanism and the second gas chamber. The chamber between the second baffle and the second structured packing layer is a semi-lean liquid chamber. The chamber below the second baffle is a lean liquid chamber. A semi-lean liquid conveying pipe is connected between the semi-lean liquid chamber and the lean liquid chamber. The semi-lean liquid conveying pipe is located outside the lower tower and is equipped with a heat exchanger to heat the semi-lean liquid flowing out of the semi-lean liquid chamber to form a lean liquid and regeneration gas flow, which is then conveyed to the lean liquid chamber. A lean liquid output channel connected to the lean liquid chamber is connected to the bottom of the lower tower.

[0008] Preferably, the first partition is an arc-shaped partition that gradually curves downward from the edge to the center, and the first air vent is located in the middle of the first partition.

[0009] Preferably, the rich liquid spraying mechanism includes a rich liquid spraying pipe and rich liquid nozzles installed on the rich liquid spraying pipe.

[0010] Preferably, the rich liquid spray pipe is set horizontally, and there are multiple rich liquid nozzles, which are arranged horizontally at the bottom of the rich liquid spray pipe.

[0011] Preferably, a third structured packing layer is provided at the top of the upper tower located above the rich liquid nozzle.

[0012] Preferably, the third structured filler layer is a wire mesh.

[0013] Preferably, the semi-rich liquid spraying mechanism includes a semi-rich liquid spraying pipe and a semi-rich liquid nozzle installed on the semi-rich liquid spraying pipe.

[0014] Preferably, the semi-rich liquid spray pipe is set horizontally, and there are multiple semi-rich liquid nozzles, which are arranged horizontally at the bottom of the semi-rich liquid spray pipe.

[0015] This utility model has the following beneficial effects:

[0016] By employing a sequence of rich liquid, semi-rich liquid, semi-lean liquid, and lean liquid flowing from top to bottom, and a sequence of regeneration gas flow from bottom to top, the absorbent at different stages reacts with the regeneration gas flow, thereby regenerating the absorbent through gas desulfurization. This effectively improves the regeneration efficiency of the absorbent and saves energy consumption. Furthermore, the regeneration tower of the absorbent regeneration device adopts a vertical tower structure, which greatly saves floor space. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the structural principle of an embodiment of the present invention.

[0018] Figure labels: 1 Upper tower, 2 Lower tower, 3 First diaphragm, 4 Second diaphragm, 5 First gas chamber, 6 Second gas chamber, 7 Regeneration gas output channel, 8 Rich liquid spraying mechanism, 81 Rich liquid spraying pipe, 82 Rich liquid nozzle, 9 Third structured packing layer, 10 First structured packing layer, 11 Second structured packing layer, 12 Semi-rich liquid chamber, 13 Semi-lean liquid chamber, 14 Lean liquid chamber, 15 Semi-lean liquid conveying pipe, 16 Semi-rich liquid spraying mechanism, 161 Semi-rich liquid spraying pipe, 162 Semi-rich liquid nozzle, 17 Heat exchanger, 18 Lean liquid output channel, 19 Semi-rich liquid conveying pipe. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0020] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] See Figure 1 As shown in the figure, as an embodiment of the present invention, an absorbent regeneration device for gas desulfurization is provided, including a regeneration tower, which includes an upper tower 1 and a lower tower 2. A first partition 3 is provided between the upper tower 1 and the lower tower 2, and a first gas tower 5 is provided on the first partition 3. The upper tower 1 and the lower tower 2 are connected through the first gas tower 5.

[0023] The top of the upper tower 1 is connected to a regeneration gas output channel 7. The upper part of the upper tower 1 is provided with a rich liquid spraying mechanism 8, which is used to spray rich liquid. The rich liquid is a regenerable absorbent liquid that has absorbed sulfides. A third structured packing layer 9 is provided between the regeneration gas output channel 7 and the rich liquid spraying mechanism 8. The third structured packing layer 9 is used to remove the absorbent liquid from the regeneration gas flow. Multiple first structured packing layers 10 arranged vertically are provided between the rich liquid spraying mechanism 8 and the first gas tower 5. The bottom chamber of the upper tower 1 is a semi-rich liquid chamber 12 for storing semi-rich liquid. The semi-rich liquid is the rich liquid that has undergone the first regeneration.

[0024] A semi-rich liquid spraying mechanism 16 is provided in the middle of the lower tower 2. A semi-rich liquid conveying pipe 19 is connected between the semi-rich liquid chamber 12 and the semi-rich liquid spraying mechanism 16. The semi-rich liquid conveying pipe 19 is located outside the regeneration tower. A second baffle 4 is provided at the lower part of the lower tower 2. A second air chamber 6 is provided on the second baffle 4. A second structured packing layer 11 is provided between the semi-rich liquid spraying mechanism 16 and the second air chamber 6. The chamber between the second baffle 4 and the second structured packing layer 11 is for semi-lean liquid. The chamber 13, located below the second partition 4, is the lean liquid chamber 14. The semi-lean liquid chamber 13 and the lean liquid chamber 14 are connected by a semi-lean liquid conveying pipe 15. The semi-lean liquid conveying pipe 15 is located outside the lower tower 2, and a heat exchanger 17 is installed on the semi-lean liquid conveying pipe 15 to heat the semi-lean liquid flowing out of the semi-lean liquid chamber 13 to form a lean liquid and regeneration gas flow, which is then conveyed to the lean liquid chamber 14. A lean liquid output channel 18 connected to the lean liquid chamber 14 is connected to the bottom of the lower tower 2.

[0025] The working process of the absorbent regeneration of this utility model is as follows:

[0026] The absorbent (which has different stages such as rich liquid, semi-rich liquid, semi-lean liquid, and lean liquid) flows from top to bottom within the regeneration tower and undergoes related reactions, while the regeneration gas flows from bottom to top within the regeneration tower and undergoes related reactions. The specific flow paths of the liquid and regeneration gas flows will now be explained in detail:

[0027] The flow path of the absorbent: The rich liquid spraying mechanism 8 sprays out the rich liquid, so that the rich liquid comes into full contact with the high-temperature regeneration gas flow from the lower tower 2 into the upper tower 1 in the first structured packing layer 10. After the rich liquid is heated by the regeneration gas flow and precipitates sulfides, it becomes a semi-rich liquid and accumulates in the semi-rich liquid cavity 12 at the bottom of the upper tower 1. The semi-rich liquid is transported to the semi-rich liquid spraying mechanism 16 through the semi-rich liquid conveying pipe 19 and sprayed into the lower tower 2. The semi-rich liquid comes into full contact with the regeneration gas flow in the lower tower 2 in the second structured packing layer 11. The semi-rich liquid is heated by the regeneration gas flow and further precipitates sulfides, becoming a semi-lean liquid. The semi-lean liquid accumulates in the semi-lean liquid cavity 13 of the lower tower 2. Then, the semi-lean liquid is heated by the semi-lean liquid conveying pipe 15 and its heat exchanger 17 to become a lean liquid and is transported to the lean liquid cavity 14. The lean liquid in the lean liquid cavity 14 is output to the outside of the regeneration tower through the lean liquid output channel 18, thereby completing the regeneration process of the absorbent. Meanwhile, the semi-lean liquid, after being heated and precipitating sulfides, forms a regeneration gas flow that enters the lean liquid chamber 14 at the bottom of the lower tower 2 and flows upward.

[0028] The regeneration gas flow path: The regeneration gas flow in the lean liquid chamber 14 at the bottom of the lower tower 2 enters the semi-lean liquid chamber 13 through the second gas tower 6, so that the semi-rich liquid and the regeneration gas flow in the semi-lean liquid chamber 13 are in full contact in the second structured packing layer 11. The semi-rich liquid is heated by the regeneration gas flow and sulfides are precipitated, thus becoming semi-lean liquid. The regeneration gas flow continues to flow upward and enters the semi-rich liquid chamber 12 through the first gas tower 5, so that the rich liquid and the regeneration gas flow are in full contact in the first structured packing layer 10. The rich liquid is heated by the regeneration gas flow and sulfides are precipitated, thus becoming semi-rich liquid. After that, the regeneration gas flow continues to flow upward. After the regeneration gas flow passes through the third structured packing layer 9 to remove the absorbent, it flows out through the regeneration gas output channel 7.

[0029] The above technical solution involves dividing the absorbent into different stages—rich, semi-rich, semi-lean, and lean—that flow sequentially from top to bottom, while the regeneration gas flows sequentially from bottom to top. This allows the absorbent at different stages to react with the regeneration gas flow, thereby regenerating the absorbent through gas desulfurization. This effectively improves the regeneration efficiency of the absorbent and saves energy consumption. Furthermore, the regeneration tower of the absorbent regeneration device adopts a vertical tower structure, which greatly saves floor space.

[0030] In this embodiment, the first gas tower 5 and the second gas tower 6 have the function of connecting and guiding gas flow. The regeneration gas flow in the lean liquid chamber 14 flows into the semi-lean liquid chamber 13 through the second gas tower 6, and the regeneration gas flow in the lower tower 2 flows into the upper tower 1 through the first gas tower 5.

[0031] In this embodiment, the first partition 3 is an arc-shaped partition that gradually curves downward from the edge to the center, so that the semi-rich liquid chamber 12 can store more semi-rich liquid. The first gas tower 5 is located in the middle of the first partition 3, so that the regeneration gas flow flows and disperses from the middle to the surrounding area, thereby making the regeneration gas flow and the rich liquid more fully contacted.

[0032] In this embodiment, the rich liquid spraying mechanism 8 includes a rich liquid spraying pipe 81 and rich liquid nozzles 82 installed on the rich liquid spraying pipe 81. The rich liquid spraying pipe 81 is horizontally arranged, and there are multiple rich liquid nozzles 82. The multiple rich liquid nozzles 82 are horizontally arranged at the bottom of the rich liquid spraying pipe 81, so that the spraying of rich liquid is more uniform and the contact with the regeneration gas flow is more sufficient, resulting in a better regeneration effect of the absorbent liquid.

[0033] In this embodiment, the third structured packing layer 9 is a wire mesh, which allows the regeneration gas flow to more fully remove the absorbent after passing through the third structured packing layer 9.

[0034] In this embodiment, the semi-rich liquid spraying mechanism 16 includes a semi-rich liquid spraying pipe 161 and semi-rich liquid nozzles 162 installed on the semi-rich liquid spraying pipe 161. The semi-rich liquid spraying pipe 161 is horizontally arranged, and there are multiple semi-rich liquid nozzles 162. The multiple semi-rich liquid nozzles 162 are horizontally arranged at the bottom of the semi-rich liquid spraying pipe 161, so that the spraying of the semi-rich liquid is more uniform and the contact with the regeneration gas flow is more sufficient, resulting in a better regeneration effect of the absorbent liquid.

[0035] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that any changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. An absorbent regeneration device for gas desulfurization, characterized in that: It includes a regeneration tower, which includes an upper tower and a lower tower. A first partition is provided between the upper tower and the lower tower, and a first air chamber is provided on the first partition. The upper tower and the lower tower are connected through the first air chamber. The top of the upper tower is connected to a regeneration gas output channel. The upper part of the upper tower is equipped with a rich liquid spraying mechanism, which is used to spray rich liquid. The rich liquid is a regenerable absorbent liquid that has absorbed sulfides. A third structured packing layer is set between the regeneration gas output channel and the rich liquid spraying mechanism. The third structured packing layer is used to remove the absorbent liquid from the regeneration gas flow. Multiple first structured packing layers are arranged vertically between the rich liquid spraying mechanism and the first gas tower. The bottom chamber of the upper tower is a semi-rich liquid chamber for storing semi-rich liquid. The semi-rich liquid is the rich liquid that has undergone the first regeneration. The lower tower has a semi-rich liquid spraying mechanism in the middle. A semi-rich liquid spraying pipe is connected between the semi-rich liquid chamber and the semi-rich liquid spraying mechanism. The semi-rich liquid spraying pipe is located outside the regeneration tower. A second baffle is installed at the bottom of the lower tower. A second gas chamber is installed on the second baffle. A second structured packing layer is installed between the semi-rich liquid spraying mechanism and the second gas chamber. The chamber between the second baffle and the second structured packing layer is a semi-lean liquid chamber. The chamber below the second baffle is a lean liquid chamber. A semi-lean liquid conveying pipe is connected between the semi-lean liquid chamber and the lean liquid chamber. The semi-lean liquid conveying pipe is located outside the lower tower and is equipped with a heat exchanger to heat the semi-lean liquid flowing out of the semi-lean liquid chamber to form a lean liquid and regeneration gas flow, which is then conveyed to the lean liquid chamber. A lean liquid output channel connected to the lean liquid chamber is connected to the bottom of the lower tower.

2. The absorbent regeneration device for gas desulfurization according to claim 1, characterized in that: The first partition is an arc-shaped partition that gradually curves downward from the edge to the center, and the first air vent is located in the middle of the first partition.

3. The absorbent regeneration device for gas desulfurization according to claim 1, characterized in that: The rich liquid spraying mechanism includes a rich liquid spraying pipe and rich liquid nozzles installed on the rich liquid spraying pipe.

4. The absorbent regeneration device for gas desulfurization according to claim 3, characterized in that: The rich liquid spray pipe is set horizontally, and there are multiple rich liquid nozzles, which are arranged horizontally at the bottom of the rich liquid spray pipe.

5. The absorbent regeneration device for gas desulfurization according to claim 1, characterized in that: A third structured packing layer is installed at the top of the upper tower above the rich liquid nozzle.

6. The absorbent regeneration device for gas desulfurization according to claim 5, characterized in that: The third structured filler layer is made of wire mesh.

7. The absorbent regeneration device for gas desulfurization according to claim 1, characterized in that: The semi-rich liquid spraying mechanism includes a semi-rich liquid spraying pipe and a semi-rich liquid nozzle installed on the semi-rich liquid spraying pipe.

8. The absorbent regeneration device for gas desulfurization according to claim 7, characterized in that: The semi-rich liquid spray pipe is set horizontally, and there are multiple semi-rich liquid nozzles, which are arranged horizontally at the bottom of the semi-rich liquid spray pipe.

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