Amine liquid recovery device

Abstract

The utility model relates to the technical field of separation devices, in particular to an amine liquid recovery device. The amine liquid recovery device comprises a tank body, the tank body is provided with an amine liquid inlet and an amine liquid outlet, the tank body is provided with a liquid level observation window, the amine liquid outlet is formed in the side wall of the tank body, the tank body is provided with a drain outlet, and the tank body is provided with an inert gas inlet. According to the amine liquid recovery device, the existing amine liquid recovery device is improved. According to the amine liquid recovery device disclosed by the utility model, the characteristic that oil impurities are low in solubility in amine liquid is utilized, the liquid level observation window, the drain outlet, the amine liquid inlet, the amine liquid outlet and the inert gas inlet are formed in the tank body, air in the tank body is replaced by inert gas, oxidative degradation of the amine liquid is reduced, impurities in the polluted amine liquid are separated through static settlement, and the amine liquid recovery efficiency is improved. Therefore, amine liquid separated from a pipeline and mixed with circulating pump lubricating oil, mechanical seal oil and other impurities is recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of separation devices, in particular to an amine liquid recovery device. Background Art

[0002] Amine liquid is a weakly alkaline organic amine solution used to absorb hydrogen sulfide or carbon dioxide in the desulfurization and decarbonization chemical process. It is mainly used in chemical industries such as petroleum, natural gas, coal chemical industry, and synthetic ammonia. Amine liquid is slightly toxic, slightly corrosive to the human body, and harmful to the eyes and skin.

[0003] The amine liquid used in the desulfurization and decarbonization unit of the natural gas purification device often leaks due to the failure of the mechanical seal of the amine liquid circulation pump. The leaked amine liquid is easily mixed with the lubricating oil of the circulation pump, the mechanical seal oil and solid impurities. When the leaked amine liquid is recovered into a temporary container, the oil impurities float on the top layer of the amine liquid, and the solid impurities are deposited at the bottom of the container. The influence of oil pollution on the amine liquid sample cannot be avoided during analysis and sampling, making it difficult to recycle such amine liquid, resulting in an increase in the consumption of amine liquid required for natural gas processing. In addition, amine liquid is a hazardous chemical, and the cost of harmless treatment is high, which will increase the operating cost of the device and environmental pressure.

[0004] A Chinese utility model patent with authorization announcement number CN215841900U and authorization announcement date of February 18, 2022 discloses an amine liquid recovery device, which includes a cylinder, a leg-type support is provided on the side of the bottom end of the cylinder, a head is provided at the bottom of the cylinder, an insulation ring is provided on the head, a liquid level gauge port is provided at the bottom of the head and the side of the cylinder, a filter element is provided in the cylinder, a baffle is provided under the filter element, and a grounding plate is provided at the bottom of the leg-type support. The amine liquid enters the cylinder through the inlet, and the internal liquid level is monitored in real time by a liquid level gauge. The amine liquid flows through the filter element and the baffle to filter and change the flow direction of the liquid, thereby improving the recovery rate of the amine liquid. However, the amine liquid recovery device performs online continuous treatment of the amine liquid in the pipeline of the desulfurization and decarbonization unit of the natural gas purification device, and cannot effectively recycle the amine liquid that is separated from the pipeline and mixed with impurities such as the circulating pump lubricating oil and machine sealing oil. Utility Model Content

[0005] The utility model aims to provide an amine liquid recovery device to solve the problem that the amine liquid separated from the pipeline and mixed with impurities such as circulating pump lubricating oil and machine sealing oil cannot be recovered and utilized.

[0006] The amine liquid recovery device of the utility model adopts the following technical solutions:

[0007] An amine liquid recovery device comprises a tank body, wherein the tank body is provided with an amine liquid inlet and an amine liquid outlet, the tank body is provided with a liquid level observation window, the amine liquid outlet is arranged on the side wall of the tank body, and the tank body is also provided with a sewage outlet and an inert gas inlet.

[0008] Beneficial effects: The utility model improves the existing amine liquid recovery device. Specifically, the amine liquid recovery device of the utility model utilizes the low solubility of oil impurities in amine liquid, and by arranging a liquid level observation window, a sewage outlet, an amine liquid inlet, an amine liquid outlet and an inert gas inlet in the tank body, the inert gas replaces the air in the tank body, avoids the contact between oxygen and amine liquid, reduces the oxidation degradation of amine liquid, and utilizes static sedimentation to separate impurities in the polluted amine liquid, thereby recycling the amine liquid that is separated from the pipeline and mixed with impurities such as the circulating pump lubricating oil and the machine seal oil.

[0009] Furthermore, the amine liquid inlet and the amine liquid outlet are provided with an inlet filter and an outlet filter respectively.

[0010] Furthermore, there are several amine liquid outlets distributed in the up-down direction.

[0011] Furthermore, the spacings between adjacent amine liquid outlets are equal.

[0012] Furthermore, the uppermost amine liquid outlet is arranged at 1 / 4 of the vertical height of the tank body, and the lowermost amine liquid outlet is arranged at the side wall at the horizontal position of the lower end of the liquid level observation window.

[0013] Furthermore, the height of the liquid level observation window is equal to the height of the tank body.

[0014] Furthermore, the tank body is provided with a pressure control port.

[0015] Furthermore, the tank body is provided with a desalted water inlet and a steam inlet.

[0016] Furthermore, the desalted water inlet and the steam inlet share an opening, which is the desalted water and steam inlet.

[0017] Furthermore, the amine liquid inlet, amine liquid outlet, inert gas inlet, desalted water and steam inlet and sewage outlet are all provided with quick connectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic structural diagram of an embodiment of an amine liquid recovery device.

[0019] Numbers in the figure: 1, tank body; 2, liquid level observation window; 3, nitrogen inlet; 4, pressure control port; 5, amine liquid inlet; 6, desalted water and steam inlet; 7, pressure monitor; 8a, T-type filter; 8b, activated carbon filter; 9, sewage outlet; 10a, first amine liquid outlet; 10b, second amine liquid outlet; 10c, third amine liquid outlet; 11, hose; A1, nitrogen inlet stop valve; A2, desalted water and steam inlet stop valve; A3, amine liquid inlet stop valve; A4, pressure regulating valve; A5, sewage outlet stop valve; B1, first amine liquid outlet stop valve; B2, second amine liquid outlet stop valve; B3, third amine liquid outlet stop valve; C1, activated carbon filter inlet stop valve; C2, activated carbon filter outlet stop valve; a, first quick interface; b, second quick interface; c, third quick interface; d, fourth quick interface; e, fifth quick interface; f, sixth quick interface; g, seventh quick interface. DETAILED DESCRIPTION

[0020] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0021] The specific implementation of the amine liquid recovery device of the utility model:

[0022] The prior art discloses an amine liquid recovery device, which delivers amine liquid into a cylinder through an inlet, and uses a liquid level gauge to monitor the internal liquid level in real time. The amine liquid flows through a filter element and a baffle to be filtered and change the liquid flow direction, thereby improving the recovery rate of the amine liquid. However, the amine liquid recovery device is only suitable for online continuous treatment of amine liquid in the pipeline of a desulfurization and decarbonization unit of a natural gas purification device, and cannot effectively recycle amine liquid that has been separated from the pipeline or has a high oil content. The utility model proposes a solution to address the deficiencies of the prior art. The core concept of the solution is to utilize the low solubility of oil impurities in amine liquid. After static sedimentation, the oil level position and amine liquid properties are confirmed from the liquid level observation window. After sampling and confirmation of compliance, the amine liquid in the middle layer is recovered, and the oil and solid impurities in the amine liquid are collected and processed through the sewage outlet.

[0023] Based on the above concept, Figure 1As shown, the amine liquid recovery device of the utility model includes a tank body 1, which is provided with an amine liquid inlet 5, a first amine liquid outlet 10a, a second amine liquid outlet 10b and a third amine liquid outlet 10c. The first amine liquid outlet 10a, the second amine liquid outlet 10b and the third amine liquid outlet 10c are located on the side wall of the tank body 1. The side wall of the tank body 1 is also provided with a liquid level observation window 2, and the bottom of the tank body 1 is provided with a sewage outlet 9. The tank body 1 is provided with an inert gas inlet, and the inert gas inlet in this embodiment is a nitrogen inlet 3, which is arranged at the top of the tank body 1. The top of the tank body 1 is also provided with a desalted water inlet and a steam inlet, and the desalted water inlet and the steam inlet share an opening, which is a desalted water and steam inlet 6. An inlet filter is provided before the amine liquid inlet 5, and the inlet filter is a T-type filter 8a. An outlet filter is provided after the first amine liquid outlet 10a, the second amine liquid outlet 10b and the third amine liquid outlet 10c, and the outlet filter is an activated carbon filter 8b.

[0024] Among the above components, the tank body 1 is a stainless steel tank body. After precipitation, the amine liquid in the tank will be divided into three layers, namely, the oil layer, the amine liquid layer and the solid impurity layer. The liquid level observation window 2 is used to observe the oil level position and the amine liquid properties in the tank. The height of the liquid level observation window 2 is equal to that of the tank body 1, so as to understand the stratification of impurities and amine liquid in the tank body 1.

[0025] The first amine liquid outlet 10a, the second amine liquid outlet 10b and the third amine liquid outlet 10c are distributed from bottom to top on the other side wall of the tank body 1 near the bottom of the tank body 1. Preferably, the first amine liquid outlet 10a, the second amine liquid outlet 10b and the third amine liquid outlet 10c are spaced equally. In other embodiments, the number of amine liquid outlets may be indefinite, and the spacing between amine liquid outlets may also be unequal, as long as it is convenient for amine liquid to be discharged. Figure 1In the embodiment, the installation position of the first amine liquid outlet 10a is at a certain height from the bottom of the side wall of the tank body 1. Another embodiment is: the installation position of the first amine liquid outlet 10a can be the same as the horizontal position of the lower end of the liquid level observation window 2, and the installation position of the third amine liquid outlet 10c can be 1 / 4 of the vertical height of the tank body 1. In other embodiments, the installation position height of the amine liquid outlet can also be set by itself, as long as it is located in the height range of the amine liquid layer, which is convenient for the discharge of the amine liquid layer. The first amine liquid outlet 10a, the second amine liquid outlet 10b and the third amine liquid outlet 10c are connected with pipelines, and the first amine liquid outlet stop valve B1, the second amine liquid outlet stop valve B2 and the third amine liquid outlet stop valve B3 are respectively installed on the pipeline. The first amine liquid outlet stop valve B1, the second amine liquid outlet stop valve B2 and the third amine liquid outlet stop valve B3 are respectively provided with a first quick interface a, a second quick interface b and a third quick interface c. A hose 11 is provided in front of the activated carbon filter 8b, and the first quick interface a, the second quick interface b or the third quick interface c is connected to the inlet of the activated carbon filter 8b through the hose 11. The inlet and outlet of the activated carbon filter 8b are respectively provided with an activated carbon filter inlet stop valve C1 and an activated carbon filter outlet stop valve C2. The activated carbon in the activated carbon filter 8b can be replaced regularly as needed to ensure the filtering effect. In this embodiment, the filter here is an activated carbon filter, and other filters such as microporous filters can also be used in other embodiments. In other embodiments, the T-type filter 8a located before the amine liquid inlet 5 can also be selected from a basket filter, a Y-type filter, etc., as long as the filtering effect is satisfied.

[0026] The top of the tank body 1 is provided with a pressure control port 4 and a pressure monitor 7. The nitrogen inlet 3 is connected to a pipeline, and a nitrogen inlet stop valve A1 is installed on the pipeline. The desalted water and steam inlet 6 are connected to a pipeline, and a desalted water and steam inlet stop valve A2 is installed on the pipeline. The amine liquid inlet 5 is connected to a pipeline, and a T-type filter 8a and an amine liquid inlet stop valve A3 are installed on the pipeline. The amine liquid inlet stop valve A3 is located upstream of the T-type filter 8a. The pressure control port 4 is connected to a pipeline, and a pressure regulating valve A4 is installed on the pipeline. The nitrogen inlet 3 cooperates with the pressure control port 4 to complete the gas phase replacement of the tank body 1. During the replacement, the pressure regulating valve A4 on the pressure control port 4 is fully opened. The gas phase replacement can effectively avoid the contact between oxygen and amine liquid, and reduce the oxidation and degradation of amine liquid. In other embodiments, nitrogen can also be replaced with other inert gases such as helium, as long as it is guaranteed not to react with the substances in the tank. The pressure monitor 7 is used to monitor the pressure in the tank. The desalted water and steam inlet 6 is used to steam and clean the tank body 1 after the amine liquid recovery is completed, which is conducive to the reuse of the amine liquid recovery device. In other embodiments, the desalted water inlet and the steam inlet can also be set separately. The drain port 9 is used to discharge unnecessary impurities. The drain port 9 is connected to a pipeline, and a drain port stop valve A5 is installed on the pipeline. The nitrogen inlet 3, the amine liquid inlet 5, the desalted water and steam inlet 6 and the drain port 9 are respectively connected to pipelines, and the fourth quick interface d, the fifth quick interface e, the sixth quick interface f, and the seventh quick interface g are installed on the pipeline for connecting with various lines.

[0027] The method of using the amine liquid recovery device of the utility model is as follows:

[0028] Open the amine liquid inlet stop valve A3 on the amine liquid inlet 5, transfer the amine liquid to be recovered from the temporary storage container to the amine liquid inlet 5, enter the tank body 1 through the T-type filter 8a, and connect the nitrogen inlet 3 to the nitrogen line to perform gas phase replacement on the gas above the tank body 1. During the replacement process, fully open the pressure regulating valve A4 on the pressure control port 4. After the amine liquid is allowed to stand in the tank body 1 for 30 minutes, observe the separation of the amine liquid and impurities through the liquid level observation window 2 to confirm whether the amine liquid is stratified with the oil-containing impurities and whether the solid impurities are precipitated at the bottom of the tank body 1, and observe the turbidity of the amine liquid. Sampling and analyzing the middle layer of the amine liquid in the tank body 1 through the first amine liquid outlet 10a, the second amine liquid outlet 10b and the third amine liquid outlet 10c on the side of the tank body 1 to determine whether the amine liquid in the tank body 1 can be recycled.

[0029] If the amine solution sampling is unqualified, close the pressure regulating valve A4 on the pressure control port 4, open the sewage outlet stop valve A5 on the sewage outlet 9 at the bottom of the tank body 1, and use the pressure to discharge the amine solution containing impurities for separate treatment. After draining, steam is introduced through the desalted water and steam inlet 6 respectively to steam the tank, and the desalted water is used for cleaning, and then the cleaning water is discharged; if the sampling is qualified, the outlet closest to the top of the bottom solid impurity deposition layer is selected from the first amine liquid outlet 10a, the second amine liquid outlet 10b and the third amine liquid outlet 10c, and it is connected to the inlet of the activated carbon filter 8b through the hose 11, and then the activated carbon filter inlet stop valve C1 and the activated carbon filter outlet stop valve C2 are opened, and the pressure regulating valve A4 on the pressure control port 4 is closed, and the middle layer of amine pressure in the tank body 1 is pressed into the activated carbon filter 8b, and discharged through the activated carbon filter outlet stop valve C2 for recovery. After completion, the amine liquid outlet stop valve connected to the hose 11 is closed, and the sewage outlet stop valve A5 at the bottom of the tank body 1 is opened to discharge the oil and solid impurities in the tank body for separate treatment. After completion, the tank body 1 can be cleaned with steam and desalted water.

Claims

1. An amine liquid recovery device, comprising a tank body, wherein the tank body is provided with an amine liquid inlet and an amine liquid outlet, characterized in that: The tank body is provided with a liquid level observation window, the amine liquid outlet is arranged on the side wall of the tank body, and the tank body is also provided with a sewage outlet and an inert gas inlet.

2. The amine solution recovery device according to claim 1, characterized in that: The amine liquid inlet and the amine liquid outlet are respectively provided with an inlet filter and an outlet filter.

3. The amine solution recovery device according to claim 1, characterized in that: There are several amine liquid outlets distributed in the up and down directions.

4. The amine solution recovery device according to claim 3, characterized in that: The spacing between adjacent amine liquid outlets is equal.

5. The amine solution recovery device according to claim 4, characterized in that: The uppermost amine liquid outlet is arranged at 1 / 4 of the vertical height of the tank body, and the lowermost amine liquid outlet is arranged at the side wall at the horizontal position below the liquid level observation window.

6. The amine solution recovery device according to claim 1, characterized in that: The height of the liquid level observation window is equal to the height of the tank body.

7. The amine solution recovery device according to claim 1, characterized in that: The tank body is provided with a pressure control port.

8. The amine solution recovery device according to claim 1, characterized in that: The tank body is provided with a desalted water inlet and a steam inlet.

9. The amine solution recovery device according to claim 8, characterized in that: The desalted water inlet and the steam inlet share an opening, which is the desalted water and steam inlet.

10. The amine solution recovery device according to claim 9, characterized in that: The amine liquid inlet, amine liquid outlet, inert gas inlet, desalted water and steam inlet and sewage outlet are all provided with quick interfaces.

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