Sectional type NMP tail gas recovery device

Abstract

The utility model provides a sectional type NMP (N-Methyl Pyrrolidone) tail gas recovery device which comprises a tail gas recovery treatment mechanism, and the tail gas recovery treatment mechanism comprises a pretreatment mechanism, an adsorption mechanism, a desorption mechanism and a post-treatment mechanism; the pretreatment mechanism comprises a cooling tower, a backwash pump is fixedly mounted at the rear end of the cooling tower, and a backwash pipe is fixedly connected to a water outlet in the bottom of the backwash pump. According to the backwash structure of the cooling tower, the backwash pump is fixedly mounted at the rear end of the cooling tower, the backwash pipe is fixedly connected to the water outlet in the bottom end of the backwash pump, and the backwash pipe is connected to the connector in the bottom end of the cooling tower, so that backwash work can be performed on the cooling tower, and blocking impurities of tail gas can be flushed out of the cooling tower; therefore, the subsequent NMP tail gas treatment is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment devices, and more specifically, relates to a segmented NMP tail gas recovery device. Background Art

[0002] The segmented NMP tail gas recovery device is a device used to recover NMP (N-methylpyrrolidone) tail gas. It usually consists of multiple stages, including a pretreatment stage, an adsorption stage, a desorption stage, and a post-treatment stage. Each stage has a specific function and effect.

[0003] In actual use, the existing segmented NMP tail gas recovery device needs to be cooled during the pre-treatment stage. Since the NMP tail gas is usually at a high temperature, it is first cooled by a cooling device, such as a cooling tower, to condense some of the NMP vapor into liquid for subsequent recovery. However, as a primary treatment mechanism, the cooling tower is often easily clogged by impurities in the tail gas, thereby affecting the subsequent NMP tail gas treatment. Therefore, in view of this, the existing structure and deficiencies are studied and improved, and a segmented NMP tail gas recovery device is provided to achieve a more practical and valuable purpose. Utility Model Content

[0004] In order to solve the above technical problems, the present invention provides a segmented NMP tail gas recovery device, which is achieved by the following specific technical means:

[0005] A segmented NMP tail gas recovery device comprises a tail gas recovery and treatment mechanism, which comprises a pretreatment mechanism, an adsorption mechanism, a desorption mechanism and a post-treatment mechanism; the pretreatment mechanism comprises a cooling tower, a backwash pump is fixedly installed at the rear end of the cooling tower, a backwash pipe is fixedly connected to the water outlet at the bottom of the backwash pump, and a backwash interface for connecting the backwash pipe is provided at the rear end of the bottom of the cooling tower; the adsorption mechanism comprises an adsorption tower, the desorption mechanism comprises a desorption tower, and the post-treatment mechanism comprises a distillation tower.

[0006] Furthermore, a sewage discharge interface is provided below the rear end of the cooling tower, adsorption tower, desorption tower and distillation tower, and a sewage discharge mechanism is fixedly installed at the sewage discharge interface. The sewage discharge mechanism includes a sewage discharge pipe fixedly installed at the sewage discharge interface, and a sewage discharge control valve is fixedly connected to the rear end of the sewage discharge pipe.

[0007] Furthermore, the bottom ends of the cooling tower, adsorption tower, desorption tower and distillation tower are all fixedly connected to a group of fixed bases, and a group of the fixed bases consists of two and are arranged in a front-to-back symmetrical shape.

[0008] Furthermore, an air inlet pipe is fixedly installed at the inlet of the upper end of the cooling tower, and a dust and oil removal filter is connected to the outlet of the bottom end of the cooling tower through a pipeline.

[0009] Furthermore, the outlet at the bottom end of the dust and oil removal filter is connected to the adsorption tower through a pipeline, and the outlet at the bottom end of the adsorption tower is connected to the inlet at the top end of the desorption tower through a pipeline.

[0010] Furthermore, the outlet at the bottom end of the desorption tower is connected to the inlet at the upper end of the distillation tower through a pipeline, the outlet at the bottom end of the distillation tower is connected to a gas monitor through a pipeline, a gas dryer is fixedly installed at the air inlet end at the bottom of the gas monitor, and an air outlet pipe is fixedly connected to the air outlet end at the top of the gas monitor.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The utility model is provided with a backwash structure of the cooling tower, that is, a backwash pump is fixedly installed at the rear end of the cooling tower, a backwash pipe is fixedly connected to the water outlet at the bottom end of the backwash pump, and the backwash pipe is connected to the interface at the bottom end of the cooling tower. The cooling tower can be backwashed, and the blocking impurities in the tail gas can be flushed out of the cooling tower, thereby ensuring the subsequent NMP tail gas treatment.

[0013] 2. The utility model is equipped with a sewage discharge mechanism at the bottom of the cooling tower, adsorption tower, desorption tower and distillation tower, that is, a sewage discharge pipe and a sewage discharge control valve are provided below them. Part of the sewage can be discharged in each tail gas treatment stage of the pretreatment stage, adsorption stage, desorption stage and post-treatment stage, reducing the maintenance pressure of the overall segmented NMP tail gas recovery device in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This utility model is an overall three-dimensional Figure 1 .

[0015] Figure 2 This utility model is an overall three-dimensional Figure 2 .

[0016] Figure 3 It is a three-dimensional diagram of the post-processing mechanism of the utility model.

[0017] Figure 4 It is a three-dimensional diagram of the pretreatment mechanism of the utility model.

[0018] In the figure, the corresponding relationship between the component names and the drawing numbers is as follows:

[0019] 1. Pretreatment mechanism; 11. Cooling tower; 12. Backwash pump; 13. Backwash pipe; 14. Dust and oil removal filter;

[0020] 2. Adsorption mechanism;

[0021] 3. Desorption mechanism;

[0022] 4. Post-processing mechanism; 41. Distillation tower; 42. Gas monitor; 43. Gas dryer; 44. Gas outlet pipe;

[0023] 5. Blowdown control valve;

[0024] 6. Fix the base. DETAILED DESCRIPTION

[0025] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] Example:

[0029] As attached Figure 1 To the attached Figure 4 As shown:

[0030] The utility model provides a segmented NMP tail gas recovery device, including a tail gas recovery and treatment mechanism, the tail gas recovery and treatment mechanism includes a pretreatment mechanism 1, an adsorption mechanism 2, a desorption mechanism 3 and a post-treatment mechanism 4; the pretreatment mechanism 1 includes a cooling tower 11, a backwash pump 12 is fixedly installed at the rear end of the cooling tower 11, a backwash pipe 13 is fixedly connected to the water outlet at the bottom of the backwash pump 12, a backwash interface for connecting the backwash pipe 13 is provided at the rear end of the bottom end of the cooling tower 11, that is, a backwash structure of the cooling tower 11 is provided, that is, the rear end of the cooling tower 11 is fixed A backwash pump 12 is installed, and a backwash pipe 13 is fixedly connected to the water outlet at the bottom of the backwash pump 12. The backwash pipe 13 is connected to the interface at the bottom of the cooling tower 11, which can backwash the cooling tower 11 and flush the blocking impurities in the tail gas out of the cooling tower 11, thereby ensuring the subsequent NMP tail gas treatment. The adsorption mechanism 2 includes an adsorption tower, the desorption mechanism 3 includes a desorption tower, and the post-processing mechanism 4 includes a distillation tower 41. The cooling tower 11, the adsorption tower, the desorption tower and the distillation tower 41 can cooperate to perform segmented NMP tail gas recovery.

[0031] Among them, the cooling tower 11, the adsorption tower, the desorption tower and the distillation tower 41 are all provided with a sewage interface at the bottom of the rear end, and a sewage mechanism is fixedly installed at the sewage interface. The sewage mechanism includes a sewage pipe fixedly installed at the sewage interface, and the rear end of the sewage pipe is fixedly connected to a sewage control valve 5. The cooling tower 11, the adsorption tower, the desorption tower and the distillation tower 41 are all provided with a sewage mechanism at the bottom, that is, a sewage pipe and a sewage control valve 5 are provided below them. Part of the waste can be discharged in each exhaust gas treatment stage of the pretreatment stage, the adsorption stage, the desorption stage and the post-treatment stage, thereby reducing the maintenance pressure of the overall segmented NMP exhaust gas recovery device in the later stage.

[0032] Among them, the bottom ends of the cooling tower 11, adsorption tower, desorption tower and distillation tower 41 are fixedly connected to a group of fixed bases 6, and a group of fixed bases 6 consists of two and are arranged symmetrically in front and back. The cooling tower 11, adsorption tower, desorption tower and distillation tower 41 can be fixedly installed and arranged through the fixed bases 6 at their bottoms.

[0033] Among them, an air intake pipe is fixedly installed at the inlet of the upper end of the cooling tower 11, and a dust removal and oil removal filter 14 is connected to the outlet of the bottom end of the cooling tower 11 through a pipeline. The NMP exhaust gas first enters the pretreatment mechanism 1 through the air intake pipe. This stage includes cooling, dust removal and oil removal steps. Cooling can reduce the temperature of the exhaust gas and condense part of the NMP vapor into liquid, thereby reducing the load of subsequent processing. Dust removal and oil removal can remove solid particles and oil mist in the exhaust gas to prevent them from clogging and damaging subsequent equipment.

[0034] Among them, the outlet of the bottom end of the dust and oil removal filter 14 is connected to the adsorption tower through a pipe, and the outlet of the bottom end of the adsorption tower is connected to the inlet of the upper end of the desorption tower through a pipe. The pretreated exhaust gas enters the adsorption tower, and the adsorption tower uses an adsorbent to adsorb NMP. The adsorbent can be activated carbon, molecular sieve, etc. They have a large specific surface area and adsorption capacity, and can effectively adsorb NMP molecules. The adsorbent saturated with adsorption enters the desorption tower. The desorption tower usually uses heating or decompression to desorb the NMP molecules adsorbed on the adsorbent. The desorbed NMP vapor can be recovered by condensation and other methods to obtain high-purity NMP liquid.

[0035] Among them, the outlet at the bottom of the desorption tower is connected to the inlet at the upper end of the distillation tower 41 through a pipeline, and the outlet at the bottom of the distillation tower 41 is connected to a gas monitor 42 through a pipeline. A gas dryer 43 is fixedly installed at the air inlet end at the bottom of the gas monitor 42, and an outlet pipe 44 is fixedly connected to the air outlet end at the top of the gas monitor 42. The adsorbent after desorption can be regenerated to restore its adsorption capacity. At the same time, the desorbed NMP vapor may still contain a small amount of impurities and moisture after condensation and recovery, and needs to be post-processed, that is, it is transferred to the distillation tower 41, the gas dryer 43 and the gas monitor 42 for distillation and drying steps to remove impurities and moisture to obtain high-purity NMP liquid, which is monitored by the gas monitor 42 and discharged through the outlet pipe 44 after passing the test.

[0036] The working principle of this embodiment is as follows: NMP tail gas first enters the pretreatment mechanism 1 through the air inlet pipe. This stage includes cooling, dust removal and oil removal steps. Cooling can reduce the temperature of the tail gas and condense part of the NMP vapor into liquid, thereby reducing the load of subsequent treatment. Dust removal and oil removal can remove solid particles and oil mist in the tail gas to prevent them from clogging and damaging subsequent equipment. The pretreated tail gas enters the adsorption tower, which uses an adsorbent to adsorb NMP. The adsorbent can be activated carbon, molecular sieve, etc., which have a large specific surface area and adsorption capacity and can effectively adsorb NMP molecules. The adsorbent saturated with adsorption enters the desorption tower, and the desorption tower Typically, NMP molecules adsorbed on the adsorbent are desorbed by heating or reducing pressure. The desorbed NMP vapor can be recovered by condensation or other methods to obtain high-purity NMP liquid. The desorbed adsorbent can be regenerated to restore its adsorption capacity. Meanwhile, the desorbed NMP vapor may still contain a small amount of impurities and moisture after condensation and recovery, requiring post-processing, i.e., being transferred to a distillation tower 41, a gas dryer 43, and a gas monitor 42 for distillation and drying steps to remove impurities and moisture to obtain high-purity NMP liquid, which is then monitored by the gas monitor 42 and discharged through the gas outlet pipe 44 after passing the test.

[0037] The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

Claims

1. A segmented NMP tail gas recovery device, including a tail gas recovery and treatment mechanism, characterized in that: The tail gas recovery and treatment mechanism comprises a pretreatment mechanism (1), an adsorption mechanism (2), a desorption mechanism (3) and a post-treatment mechanism (4); the pre-treatment mechanism (1) comprises a cooling tower (11), a backwash pump (12) is fixedly installed at the rear end of the cooling tower (11), a backwash pipe (13) is fixedly connected to the water outlet at the bottom of the backwash pump (12), and a backwash interface for connecting the backwash pipe (13) is provided at the rear end of the bottom of the cooling tower (11); the adsorption mechanism (2) comprises an adsorption tower, the desorption mechanism (3) comprises a desorption tower, and the post-treatment mechanism (4) comprises a distillation tower (41); a sewage discharge interface is provided below the rear end of the cooling tower (11), the adsorption tower, the desorption tower and the distillation tower (41), and a sewage discharge mechanism is fixedly installed at the sewage discharge interface.

2. A sectional NMP tail gas recovery device as claimed in claim 1, characterized in that: The bottom ends of the cooling tower (11), the adsorption tower, the desorption tower and the distillation tower (41) are all fixedly connected to a set of fixed bases (6), and the set of fixed bases (6) consists of two and are arranged in a front-to-back symmetrical shape.

3. A sectional NMP tail gas recovery device as claimed in claim 1, characterized in that: An air inlet pipe is fixedly installed at the inlet of the upper end of the cooling tower (11), and a dust and oil removal filter (14) is connected to the outlet of the bottom end of the cooling tower (11) through a pipeline.

4. A sectional NMP tail gas recovery device as claimed in claim 3, characterized in that: The outlet at the bottom end of the dust and oil removal filter (14) is connected to the adsorption tower through a pipeline.

5. A sectional NMP tail gas recovery device as claimed in claim 1, characterized in that: The outlet at the bottom end of the adsorption tower is connected to the inlet at the top end of the desorption tower through a pipeline, and the outlet at the bottom end of the desorption tower is connected to the inlet at the top end of the distillation tower (41) through a pipeline.

6. A segmented NMP tail gas recovery device as claimed in claim 1, characterized in that: The outlet at the bottom end of the distillation tower (41) is connected to a gas monitor (42) via a pipeline.

7. A segmented NMP tail gas recovery device as claimed in claim 6, characterized in that: A gas dryer (43) is fixedly installed at the gas inlet end at the bottom of the gas monitor (42), and a gas outlet pipe (44) is fixedly connected to the gas outlet end at the top of the gas monitor (42).

8. A segmented NMP tail gas recovery device as claimed in claim 1, characterized in that: The sewage discharge mechanism comprises a sewage discharge pipe fixedly installed at the sewage discharge interface, and a sewage discharge control valve (5) is fixedly connected to the rear end of the sewage discharge pipe.

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