Microwave coupling supergravity desorption device and method

Abstract

The invention provides a microwave coupling supergravity desorption device and method, the desorption device comprises: a housing provided with a liquid inlet, a liquid outlet and a gas outlet; the rotating shaft is arranged in the shell, and a wire slot and a microwave head are arranged on the rotating shaft; the electric slip ring comprises a fixed outer ring and a sliding inner ring, the fixed outer ring is connected with a motor, the sliding inner ring is tightly hooped with the top of the rotating shaft, a wire is arranged in a wire groove in the rotating shaft, and one end of the wire is connected with the sliding inner ring. The device can realize efficient coupling of microwaves and the rotating shaft, the microwave probe desorbs the amine-rich liquid, and the desorption energy consumption can be reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of carbon dioxide treatment, and particularly relates to a microwave coupling supergravity desorption device and method. BACKGROUND

[0002] The carbon dioxide discharged in the production process of the petrochemical industry accounts for about 13% of the total carbon emissions in China and about 17% of the carbon emissions in the industrial field, ranking third in carbon emission intensity in the industrial sector. Under the dual-carbon target, the petrochemical industry has a greater pressure on carbon emission reduction. The petrochemical industry has the characteristics of a long production and processing chain, a wide variety of products, and a large difference in devices, resulting in high total carbon emissions, many point sources of emissions, different degrees of aggregation, and differentiated tail gas carbon dioxide. Therefore, developing an efficient carbon dioxide separation process for the refining field is an important foundation for supporting the petrochemical industry to achieve carbon neutrality.

[0003] The chemical amine method is a carbon capture technology with high technical maturity, and is the main technical route for realizing large-scale carbon capture in various industries under the current dual-carbon scenario. In the prior art, when the rich amine solution that has absorbed carbon dioxide is desorbed, high-temperature water vapor needs to be introduced for desorption, which consumes a large amount of energy.

[0004] Therefore, there is a need to provide a rich amine solution desorption method with low energy consumption. SUMMARY

[0005] The purpose of the present application is to provide a microwave coupling supergravity desorption device that can achieve efficient coupling of microwaves and a rotating shaft, desorb rich amine solution with a microwave probe, and reduce desorption energy consumption and shorten the process flow.

[0006] The purpose of the present application is also to provide a microwave coupling supergravity desorption method.

[0007] To achieve the above purpose, the present application provides a microwave coupling supergravity desorption device, comprising:

[0008] A housing is provided with a liquid inlet, a liquid outlet and a gas outlet;

[0009] A rotating shaft is arranged in the housing, and the rotating shaft is provided with a wire slot and a microwave head;

[0010] An electric slip ring includes a fixed outer ring and a sliding inner ring, the fixed outer ring is connected with a motor, the sliding inner ring is tightly clamped with the top of the rotating shaft, a wire is arranged in the wire slot of the rotating shaft, one end of the wire is connected with the sliding inner ring, and the other end of the wire is connected with the microwave head.

[0011] The microwave coupling supergravity desorption device provided by the present application further comprises:

[0012] A bearing is arranged at the bottom of the rotating shaft.

[0013] A support device comprises a bearing seat located below the bearing for supporting the bearing, and a base located below the bearing seat for supporting the bearing seat and the housing.

[0014] The microwave coupling supergravity desorption device has a plurality of microwave heads arranged uniformly on the rotating shaft from top to bottom.

[0015] The microwave coupling supergravity desorption device has a plurality of microwave heads connected in parallel or in series.

[0016] The microwave coupling supergravity desorption device has a microwave head with a certain length.

[0017] The microwave coupling supergravity desorption device has a microwave head with a certain length.

[0018] The microwave coupling supergravity desorption device has a liquid inlet located below the housing and a liquid outlet located above the housing.

[0019] To achieve the above-mentioned purpose, the application also provides a microwave coupling supergravity desorption method, which uses the microwave coupling supergravity desorption device described above, and passes the rich amine liquid into the housing through the liquid inlet, drives the rotating shaft to rotate through the motor and the electric slip ring, and powers the microwave head, so that the microwave head heats the rich amine liquid, and the rotation of the rotating shaft and the disturbance of the microwave head make the rich amine liquid disperse quickly in the housing to speed up heat transfer, the rich amine liquid is desorbed under the action of rapid dispersion and heating, the desorbed carbon dioxide is discharged through the gas outlet, and the lean amine liquid is discharged through the liquid outlet.

[0020] The microwave coupling supergravity desorption method has a microwave head with a frequency of 2400-2500 MHz.

[0021] The microwave coupling supergravity desorption method has a rotating shaft with a rotating speed of 400-1200 rpm.

[0022] The application has the following beneficial effects:

[0023] The device realizes efficient coupling of microwaves and rotating shafts, and is compact; the microwave probe has diversified functions, can heat the rich amine liquid to realize thermal desorption, accelerate the flow of the rich amine liquid, and improve the heat mass transfer efficiency; compared with the traditional steam desorption, the microwave probe desorbs the rich amine liquid, can reduce the desorption energy consumption, shorten the process flow, save the reboiler, and reduce the process connection with the process steam. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Structure diagram of the microwave coupling supergravity desorption device according to the present application;

[0025] Figure 2 Process flow diagram of the microwave coupling supergravity desorption device according to the present application for desorbing rich amine solution.

[0026] In the drawings:

[0027] 1 motor; 2 electric slip ring; 3 microwave head; 4 rotating shaft; 5 wire slot; 6 liquid inlet; 7 sealing ring; 8 gas outlet; 9 shell; 10 liquid outlet; 11 bearing; 12 bearing seat; 13 base; 14 rich amine solution; 15 pump; 16 lean amine solution. DETAILED DESCRIPTION

[0028] The present application will be described in detail below by way of examples. It is necessary to point out here that the following examples are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application, and those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above content of the present application.

[0029] Figure 1 Structure diagram of the microwave coupling supergravity desorption device according to the present application. A microwave coupling supergravity desorption device, comprising: a shell 9, the shell 9 is provided with a liquid inlet 6, a liquid outlet 10 and a gas outlet 8; a rotating shaft 4, the rotating shaft 4 is arranged in the shell 9, the rotating shaft 4 is provided with a wire slot 5 and a microwave head 3; an electric slip ring 2, the electric slip ring 2 comprises a fixed outer ring and a sliding inner ring, the fixed outer ring is connected with a motor 1, the sliding inner ring is tightly clamped with the top of the rotating shaft 4, the wire slot 5 on the rotating shaft 4 is provided with a wire, one end of the wire is connected with the sliding inner ring, and the other end is connected with the microwave head 3; a bearing 11, the bearing 11 is located at the bottom of the rotating shaft 4; a supporting device, the supporting device comprises a bearing seat 12 and a base 13, the bearing seat 12 is located below the bearing 11 for supporting the bearing 11, the base 13 is located below the bearing seat 12 for supporting the bearing seat 12 and the shell 9, and a sealing ring 7 is arranged between the base 13 and the shell.

[0030] In a preferred embodiment, a plurality of microwave heads 3 can be arranged on the rotating shaft 4, and the plurality of microwave heads 3 are uniformly distributed on the rotating shaft 4 from top to bottom. One or more microwave heads 3 can also be arranged at the same height of the rotating shaft 4. The microwave head 3 has a certain length, and the microwave head 3 and the rotating shaft 4 can be perpendicular to each other or connected and arranged at other angles, and the end of the microwave head 3 away from the rotating shaft 4 is as close as possible to the shell 9 but does not contact the shell 9. The wire slot 5 of the rotating shaft 4 is embedded with a wire capable of conducting electricity, so as to realize the electrical communication between the electric slip ring 2 and the microwave head 3, and the plurality of microwave heads 3 can be connected in parallel or in series.

[0031] In a preferred embodiment, the liquid inlet 6 is located below the housing 9, and the liquid outlet 10 is located above the housing 9. This upward flow direction of the amine-rich liquid can prolong the residence time in the device, making desorption more complete.

[0032] When using a microwave-coupled hypergravity device for desorption, such as Figure 2 As shown, the rich amine liquid 14 is transferred to the bottom of the microwave-coupled hypergravity device by the pump 15. The motor 1 drives the rotating shaft 4 to rotate through the electric slip ring 2 and powers the microwave head 3, so that the microwave head 3 heats the rich amine liquid 14. The rotation of the rotating shaft 4 and the disturbance of the microwave head 3 cause the rich amine liquid 14 to be rapidly dispersed in the shell 9 to accelerate heat transfer. Under the action of rapid dispersion and heating, the rich amine liquid 14 desorbs carbon dioxide. The desorbed carbon dioxide is discharged from the gas outlet 8, and the lean amine liquid 16 is discharged from the liquid outlet 10.

[0033] Example 1

[0034] use Figure 2 The apparatus shown is used for the desorption of amine-rich solution. The shell diameter is 40 cm, the rotating shaft diameter is 7 cm, and the length is 2 m. The microwave heads are set vertically to the rotating shaft and are evenly distributed vertically. There is one microwave head at the same height on the rotating shaft. There are 18 microwave heads in total. The microwave head frequency is 2400 MHz, the rotating shaft speed is 400 rpm, and the amine-rich solution is ethanolamine with a carbon dioxide content of 5 wt%, which is introduced into the shell at a rate of 80 L / h.

[0035] The lean liquid at the feed outlet was tested, and the carbon dioxide desorption rate in the solution was 86%, with a desorption energy consumption of 2.0 GJ / t CO2.

[0036] Example 2

[0037] use Figure 2 The apparatus shown performs desorption of a rich amine solution. The shell diameter is 40 cm, the rotating shaft diameter is 7 cm, and the length is 2 m. The microwave heads are set perpendicular to the rotating shaft and are evenly distributed vertically. Two microwave heads are evenly distributed at the same height on the rotating shaft. There are 36 microwave heads in total. The microwave head frequency is 2500 MHz, the rotating shaft speed is 800 rpm, and the rich amine solution is ethanolamine with a carbon dioxide content of 5 wt%, which is introduced into the shell at a rate of 80 L / h.

[0038] The lean liquid at the feed outlet was tested, and the carbon dioxide desorption rate in the solution was 90%, with a desorption energy consumption of 1.9 GJ / t CO2.

[0039] Example 3

[0040] use Figure 2The device shown is used for desorption of rich amine solution, the shell diameter is 40 cm, the rotating shaft diameter is 7 cm, the length is 2 m, the microwave head is arranged perpendicularly to the rotating shaft and is uniformly distributed above and below, 3 microwave heads are uniformly distributed at the same height of the rotating shaft, the number of microwave heads is 54, the frequency of the microwave head is 2450 MHz, the rotating speed of the rotating shaft is 1200 rpm, and the rich amine solution is ethanol amine with a carbon dioxide content of 5 wt%, which is introduced into the shell at a speed of 120 L / h.

[0041] The lean solution at the outlet of the feed liquid is detected, the carbon dioxide desorption rate in the solution is 92%, and the desorption energy consumption is 1.8 GJ / t CO2.

[0042] Example 4

[0043] Use Figure 2 The device shown is used for desorption of rich amine solution, the shell diameter is 40 cm, the rotating shaft diameter is 7 cm, the length is 2 m, the microwave head is arranged perpendicularly to the rotating shaft and is uniformly distributed above and below, 3 microwave heads are uniformly distributed at the same height of the rotating shaft, the number of microwave heads is 54, the frequency of the microwave head is 2450 MHz, the rotating speed of the rotating shaft is 1200 rpm, and the rich amine solution is ethanol amine with a carbon dioxide content of 5 wt%, which is introduced into the shell at a speed of 120 L / h.

[0044] The lean solution at the outlet of the feed liquid is detected, the carbon dioxide desorption rate in the solution is 92%, and the desorption energy consumption is 1.8 GJ / t CO2.

[0045] Comparative Example 1

[0046] The device and the rich amine solution used in Example 1 are the same. The difference is that the microwave head only functions as a stirring paddle without microwave function, the rotating speed of the rotating shaft is 400 rpm, and hot steam at 110 DEG C is introduced into the bottom of the shell at a flow rate of 20 L / h.

[0047] The lean solution at the outlet of the feed liquid is detected, the carbon dioxide desorption rate in the solution is 92%, and the desorption energy consumption is 1.8 GJ / t CO2.

[0048] Of course, the present application can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application, but these corresponding changes and modifications should all belong to the protection scope of the claims of the present application.

Claims

1. A microwave-coupled hypergravity desorption device, characterized in that, include: A housing, wherein the housing is provided with a liquid inlet, a liquid outlet and a gas outlet; A rotating shaft is disposed inside the housing, and the rotating shaft is provided with a wire groove and a microwave head; An electric slip ring, comprising a fixed outer ring and a sliding inner ring, wherein the fixed outer ring is connected to a motor, the sliding inner ring is tightly clamped to the top of a rotating shaft, and a wire is provided in a groove on the rotating shaft, one end of the wire being connected to the sliding inner ring and the other end being connected to a microwave head.

2. The microwave-coupled hypergravity desorption device according to claim 1, characterized in that, Also includes: A bearing, located at the bottom of the rotating shaft; A support device, comprising a bearing housing and a base, wherein the bearing housing is located below the bearing for supporting the bearing, and the base is located below the bearing housing for supporting the bearing housing and the housing.

3. The microwave-coupled hypergravity desorption device according to claim 1, characterized in that, The rotating shaft is equipped with multiple microwave heads, which are evenly distributed from top to bottom on the rotating shaft.

4. The microwave-coupled hypergravity desorption device according to claim 3, characterized in that, The multiple microwave heads are connected in parallel or in series.

5. The microwave-coupled hypergravity desorption device according to claim 1, characterized in that, The microwave head has a certain length.

6. The microwave-coupled hypergravity desorption device according to claim 5, characterized in that, The end of the microwave head furthest from the rotation axis is close to the housing but does not contact the housing.

7. The microwave-coupled hypergravity desorption device according to claim 1, characterized in that, The liquid inlet is located below the housing, and the liquid outlet is located above the housing.

8. A microwave-coupled supergravity desorption method, characterized in that, Using any one of the microwave-coupled supergravity desorption devices according to claims 1-7, a rich amine solution is introduced into the housing through the liquid inlet. The motor drives the rotating shaft to rotate through the electric slip ring and powers the microwave head to heat the rich amine solution. The rotation of the rotating shaft and the disturbance of the microwave head cause the rich amine solution to disperse rapidly in the housing, accelerating heat transfer. Under the action of rapid dispersion and heating, the rich amine solution desorbs carbon dioxide. The desorbed carbon dioxide is discharged through the gas outlet, and the lean amine solution is discharged through the liquid outlet.

9. The microwave-coupled hypergravity desorption method according to claim 8, characterized in that, The frequency of the microwave head is 2400-2500MHz.

10. The microwave-coupled hypergravity desorption method according to claim 9, characterized in that, The rotational speed of the rotating shaft is 400 to 1200 rpm.

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