acrolein exhaust gas recovery system

Abstract

This utility model relates to the field of acrolein tail gas recovery technology, and discloses an acrolein tail gas recovery system, including an acrolein storage tank and an absorption tower. The acrolein storage tank is used to store acrolein tail gas. The absorption tower is connected to the acrolein storage tank through a connecting pipe, and an induced draft fan is installed on the connecting pipe to transport the acrolein tail gas from the acrolein storage tank to the absorption tower. Process absorption water is introduced into the absorption tower to recover acrolein from the acrolein tail gas. This acrolein tail gas recovery system can significantly reduce the probability of acrolein tail gas polymerization in the connecting pipe by using the induced draft fan, avoiding blockage of the connecting pipe. The process absorption water introduced into the absorption tower absorbs the acrolein in the acrolein tail gas, preventing polymerization reaction and avoiding blockage of the absorption tower. This reduces the cost of downtime to replace blocked connecting pipes or clean the absorption tower. At the same time, acrolein can be purified and recovered as a product, realizing the recycling of acrolein.

Description

Technical Field

[0001] This utility model relates to the field of acrolein tail gas recovery technology, and in particular to an acrolein tail gas recovery system. Background Technology

[0002] In traditional processes, acrolein storage tank exhaust gas is connected to the workshop exhaust gas absorption tower via a gas phase balance pipe, where it is absorbed and treated by a circulating alkaline aqueous solution. This exhaust gas absorption process has the following drawbacks: ① Acrolein exhaust gas in the gas phase balance pipe easily condenses at the lowest point of the pipe, forming acrolein liquid. Without a polymerization inhibitor, this liquid easily polymerizes to form acrolein polymers, blocking the gas phase balance pipe. ② The alkaline aqueous solution in the exhaust gas absorption tower also easily forms acrolein polymers during the absorption of acrolein gas, causing blockages and affecting the absorption efficiency. Cleaning the polymers in traditional processes is difficult. To avoid significant impact on production, the blocked pipes are typically replaced directly after production is stopped, and the exhaust gas absorption tower is manually cleaned, resulting in high economic costs. Utility Model Content

[0003] The purpose of this invention is to propose an acrolein tail gas recovery system, which solves the technical problems in the prior art, such as acrolein tail gas condensation clogging the connecting pipes, and the formation of acrolein polymers during the absorption of acrolein tail gas in the absorption tower through alkaline aqueous solution, causing blockage of the tail gas absorption tower.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] This utility model provides an acrolein tail gas recovery system, comprising:

[0006] An acrolein storage tank, wherein the acrolein storage tank is used to store acrolein tail gas;

[0007] An absorption tower is connected to the acrolein storage tank via a connecting pipe. An induced draft fan is installed on the connecting pipe between the absorption tower and the acrolein storage tank to transport the acrolein tail gas from the acrolein storage tank to the absorption tower. Process absorption water is introduced into the absorption tower to recover acrolein from the acrolein tail gas.

[0008] This acrolein tail gas recovery system incorporates an induced draft fan between the acrolein storage tank and the absorption tower. This fan significantly reduces the probability of acrolein tail gas polymerizing within the connecting pipes, preventing blockages. Process absorbent water is introduced into the absorption tower to absorb the acrolein in the tail gas, eliminating polymerization and preventing blockages. This reduces the cost of downtime for replacing blocked pipes or cleaning the absorption tower. Furthermore, the absorbed acrolein can be purified and recycled as a product, achieving the recovery and utilization of acrolein.

[0009] As a preferred embodiment of the aforementioned acrolein tail gas recovery system, the acrolein tail gas recovery system further includes:

[0010] A recovery device, which is connected to the absorption tower, is used to collect the acrolein solution obtained by the absorption tower.

[0011] The installation of the recovery device facilitates the collection and storage of the acrolein solution formed in the absorption tower, so as to facilitate subsequent process treatment and utilization.

[0012] As a preferred embodiment of the aforementioned acrolein tail gas recovery system, the acrolein storage tank is provided with an outlet at its top, and the outlet is connected to the absorption tower via the connecting pipe.

[0013] The outlet is designed to facilitate the installation of connecting pipes, enabling the connection between the acrolein storage tank and the absorption tower.

[0014] As a preferred embodiment of the aforementioned acrolein tail gas recovery system, the output port is the vent port of the acrolein storage tank.

[0015] The outlet is the vent of the acrolein storage tank, which utilizes the original vent of the acrolein storage tank. There is no need to set up a new outlet, and therefore no need to modify the acrolein storage tank.

[0016] As a preferred embodiment of the aforementioned acrolein tail gas recovery system, a collection device is provided at the outlet. One end of the collection device is connected to the connecting pipe, and the other end is configured as a flared structure. The size of the flared structure gradually increases along the direction close to the acrolein storage tank.

[0017] The other end of the collecting device has a flared structure, which can guide and collect the gas, making it easier for the gas to enter the connecting pipe.

[0018] As a preferred embodiment of the aforementioned acrolein tail gas recovery system, the connecting pipe connected to the acrolein storage tank is connected to the lower middle part of the absorption tower.

[0019] The connecting pipe connected to the acrolein storage tank is connected to the middle and lower part of the absorption tower. The acrolein tail gas entering the absorption tower moves upward from the entry point and disperses and fills the absorption tower. The acrolein tail gas is filled more fully and dispersed more evenly, which facilitates full contact with the process absorption water and improves the absorption efficiency.

[0020] As a preferred embodiment of the aforementioned acrolein tail gas recovery system, an inlet is provided in the lower middle part of the absorption tower, and the connecting pipe connected to the acrolein storage tank is connected to the inlet.

[0021] An inlet is provided in the lower middle part of the absorption tower to facilitate connection with the connecting pipeline.

[0022] As a preferred embodiment of the aforementioned acrolein tail gas recovery system, the connecting pipe is a DN200 pipe.

[0023] DN200 pipes have advantages such as high-efficiency heat insulation, strong corrosion resistance, and strong pressure resistance.

[0024] As a preferred embodiment of the aforementioned acrolein tail gas recovery system, a flow control component is provided on the connecting pipe for detecting and controlling the flow rate on the connecting pipe.

[0025] The flow control component is designed to detect and control the flow rate of acrolein exhaust gas in the connecting pipe to meet different usage scenarios.

[0026] As a preferred embodiment of the aforementioned acrolein tail gas recovery system, the flow control components are installed on the connecting pipes before and after the induced draft fan.

[0027] The above settings facilitate the separate detection and control of the acrylaldehyde exhaust gas flow rate in the connecting pipes before and after the induced draft fan, resulting in more precise detection and control.

[0028] The beneficial effects of this utility model are:

[0029] This acrolein tail gas recovery system incorporates an induced draft fan between the acrolein storage tank and the absorption tower. This fan significantly reduces the probability of acrolein tail gas polymerizing within the connecting pipes, preventing blockages. Process absorbent water is introduced into the absorption tower to absorb the acrolein in the tail gas, eliminating polymerization and preventing blockages. This reduces the cost of downtime for replacing blocked pipes or cleaning the absorption tower. Furthermore, the absorbed acrolein can be purified and recycled as a product, achieving the recovery and utilization of acrolein. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the acrolein tail gas recovery system provided by this utility model.

[0031] In the picture:

[0032] 1. Acrylaldehyde storage tank; 2. Absorption tower; 3. Connecting pipeline; 4. Exhaust fan. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] In traditional processes, acrolein storage tank exhaust gas is connected to the workshop exhaust gas absorption tower via a gas phase balance pipe, where it is absorbed and treated by a circulating alkaline aqueous solution. This exhaust gas absorption process has the following drawbacks: ① Acrolein exhaust gas in the gas phase balance pipe easily condenses at the lowest point of the pipe, forming acrolein liquid. Without a polymerization inhibitor, this liquid easily polymerizes to form acrolein polymers, blocking the gas phase balance pipe. ② The alkaline aqueous solution in the exhaust gas absorption tower also easily forms acrolein polymers during the absorption of acrolein gas, causing blockages and affecting the absorption efficiency. Cleaning the polymers in traditional processes is difficult. To avoid significant impact on production, the blocked pipes are typically replaced directly after production is stopped, and the exhaust gas absorption tower is manually cleaned, resulting in high economic costs.

[0038] To solve the above problems, such as Figure 1As shown, this embodiment provides an acrolein tail gas recovery system, including an acrolein storage tank 1 and an absorption tower 2. The acrolein storage tank 1 is used to store acrolein tail gas. The absorption tower 2 is connected to the acrolein storage tank 1 through a connecting pipe 3. An induced draft fan 4 is installed on the connecting pipe 3 between the absorption tower 2 and the acrolein storage tank 1 to transport the acrolein tail gas in the acrolein storage tank 1 to the absorption tower 2. Process absorption water is introduced into the absorption tower 2 to recover acrolein from the acrolein tail gas.

[0039] The acrolein tail gas recovery system has an induced draft fan 4 installed between the acrolein storage tank 1 and the absorption tower 2. The induced draft fan 4 can significantly reduce the probability of acrolein tail gas polymerizing in the connecting pipe 3, thus avoiding blockage of the connecting pipe 3. Process absorbent water is introduced into the absorption tower 2 to absorb acrolein in the acrolein tail gas, preventing the polymerization reaction from occurring and avoiding blockage of the absorption tower 2. This reduces the cost of downtime to replace the blocked connecting pipe 3 or clean the absorption tower 2. At the same time, the absorbed acrolein can be purified and recycled as a product, realizing the recycling of acrolein.

[0040] Specifically, the acrolein storage tank 1 is equipped with an outlet at its top, which is connected to the absorption tower 2 via a connecting pipe 3. The outlet facilitates the installation of the connecting pipe 3, thereby enabling the connection between the acrolein storage tank 1 and the absorption tower 2.

[0041] In this embodiment, the outlet is the vent of acrolein storage tank 1. The original vent of acrolein storage tank 1 is utilized, and there is no need to set up a new outlet, thus eliminating the need to modify acrolein storage tank 1.

[0042] Optionally, a collection device is provided at the outlet. One end of the collection device is connected to the connecting pipe 3, and the other end is configured as a flared structure. The size of the flared structure gradually increases along the direction close to the acrolein storage tank 1, which can guide and collect the gas, facilitating the gas to enter the connecting pipe 3. In this embodiment, the collection device can be configured as a cylindrical structure with different inner diameters at both ends. The end with the larger inner diameter is connected to the connecting pipe 3.

[0043] Optionally, the connecting pipe 3 connected to the acrolein storage tank 1 is connected to the middle and lower part of the absorption tower 2. The acrolein tail gas entering the absorption tower 2 moves upward from the entry position and disperses and fills the absorption tower 2. The acrolein tail gas is filled more fully and dispersed more evenly, which facilitates full contact between the process absorption water and the absorption efficiency.

[0044] Specifically, an inlet is provided in the lower middle part of the absorption tower 2, and the connecting pipe 3, which is connected to the acrolein storage tank 1, is connected to the inlet. The inlet in the lower middle part of the absorption tower 2 facilitates connection with the connecting pipe 3.

[0045] Optionally, the top of the absorption tower 2 is connected to a channel for input process absorption water. The process absorption water is cooling process water generated during the acrolein preparation process or other processes in the workshop. The cooling process water can absorb acrolein in the acrolein tail gas to form an acrolein solution. Compared with the existing technology, which uses an alkaline aqueous solution to absorb and treat acrolein tail gas for waste treatment, this method can effectively recycle acrolein and save resources.

[0046] In this embodiment, the connecting pipe 3 is a DN200 pipe. DN200 pipes have advantages such as high-efficiency heat insulation, strong corrosion resistance, and strong pressure resistance.

[0047] Optionally, the acrolein tail gas recovery system also includes a recovery device (not shown in the figure), which is connected to the absorption tower 2 and is used to collect the acrolein solution obtained from the absorption tower 2. The recovery device facilitates the collection and storage of the acrolein solution formed in the absorption tower 2 for subsequent process treatment and utilization.

[0048] Optionally, a flow control component (not shown in the figure) is provided on the connecting pipe 3 to detect and control the flow rate of acrolein tail gas in the connecting pipe 3 to meet different usage scenarios.

[0049] Preferably, flow control components are installed on the connecting pipes 3 before and after the induced draft fan 4 to facilitate the detection and control of the acrylaldehyde exhaust gas flow rate in the connecting pipes 3 before and after the induced draft fan 4, making the detection and control more accurate.

[0050] During operation, after starting the induced draft fan 4, the acrolein tail gas at the outlet of the acrolein storage tank 1 is collected under slight negative pressure and then conveyed under positive pressure by the induced draft fan 4 into the absorption tower 2 for absorption treatment. The acrolein tail gas collected under negative pressure is less likely to accumulate into liquid in the connecting pipe 3, thus avoiding the formation of acrolein polymers.

[0051] The aforementioned acrolein tail gas recovery system can reduce the formation of polymers in the connecting pipe 3, avoiding the economic costs caused by replacing the connecting pipe 3 due to blockage; by absorbing acrolein in the tail gas through process absorption water, acrolein products are generated, improving the product yield. Approximately 200 kg of acrolein can be recovered per day, generating certain economic benefits.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An acrolein tail gas recovery system, characterized in that, include: Acrolein storage tank (1), wherein the acrolein storage tank (1) is used to store acrolein tail gas; An absorption tower (2) is connected to an acrolein storage tank (1) via a connecting pipe (3). An induced draft fan (4) is installed on the connecting pipe (3) between the absorption tower (2) and the acrolein storage tank (1) to transport the acrolein tail gas in the acrolein storage tank (1) to the absorption tower (2). Process absorption water is introduced into the absorption tower (2) to recover acrolein in the acrolein tail gas.

2. The acrolein tail gas recovery system according to claim 1, characterized in that, The acrolein tail gas recovery system also includes: A recovery device is connected to the absorption tower (2) and is used to collect the acrolein solution obtained by the absorption tower (2).

3. The acrolein tail gas recovery system according to claim 1, characterized in that, The acrolein storage tank (1) is provided with an outlet at the top, and the outlet is connected to the absorption tower (2) through the connecting pipe (3).

4. The acrolein tail gas recovery system according to claim 3, characterized in that, The outlet is the vent of the acrolein storage tank (1).

5. The acrolein tail gas recovery system according to claim 3, characterized in that, A collection device is provided at the outlet. One end of the collection device is connected to the connecting pipe (3), and the other end is configured as a flared structure. The size of the flared structure gradually increases along the direction close to the acrolein storage tank (1).

6. The acrolein tail gas recovery system according to claim 1, characterized in that, The connecting pipe (3) connected to the acrolein storage tank (1) is connected to the lower middle part of the absorption tower (2).

7. The acrolein tail gas recovery system according to claim 5, characterized in that, The absorption tower (2) is provided with an inlet in the middle and lower part, and the connecting pipe (3) connected to the acrolein storage tank (1) is connected to the inlet.

8. The acrolein tail gas recovery system according to any one of claims 1-7, characterized in that, The acrolein storage tank (1) is connected to the inlet of the induced draft fan (4) via a DN200 pipe.

9. The acrolein tail gas recovery system according to any one of claims 1-7, characterized in that, A flow control component is provided on the connecting pipe (3) for detecting and controlling the flow rate within the connecting pipe (3).

10. The acrolein tail gas recovery system according to claim 9, characterized in that, The flow control components are installed on the connecting pipes (3) before and after the induced draft fan (4).

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