Regeneration device and system for decarburization solution of ethylene oxide device

Abstract

The invention provides a regeneration device and system for a decarburization solution of an ethylene oxide device, and relates to the technical field of ethylene oxide, the regeneration device comprises: a turbine for performing energy conversion on a carbonic acid-rich solution absorbing carbon dioxide; the first flash evaporation unit is connected with the turbine; the two-stage regeneration unit comprises at least two groups of pressurized regeneration units which are connected with the first flash evaporation unit and are used for carrying out first regeneration on the carbonic acid-rich solution; the at least two groups of normal-pressure regeneration units are connected with the pressurized regeneration unit and are used for regenerating the carbonic acid-rich solution for the second time; the second flash evaporation unit is connected with the bottom of the normal-pressure regeneration unit; wherein the regeneration pressure in the pressurized regeneration unit is greater than the regeneration pressure in the normal-pressure regeneration unit. According to the method, a new carbonic acid solution does not need to be continuously supplemented in the carbon dioxide adsorption process, the production amount of production waste liquid is reduced, the treatment cost of carbon dioxide is reduced, and meanwhile, environmental pollution is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ethylene oxide, and in particular to a regeneration device and system for decarbonization solution of an ethylene oxide plant. Background Art

[0002] Producing high-purity ethylene oxide is an important part of the ethylene industrial chain, and thus has a very close connection with the development of petrochemical enterprises. As one of the constituent units of the ethylene oxide plant, the carbon dioxide removal unit mainly functions to remove the by-product carbon dioxide from the reaction recycle gas stream of ethylene oxide, so as to keep the component concentration in the recycle gas system stable.

[0003] The decarbonization device of the ethylene oxide plant provided by the related technology includes a carbonate hydraulic turbine, a regeneration tower and at least one reboiler; a feed pipeline and a purge pipeline are provided at the liquid outlet of the carbonate hydraulic turbine; the feed pipeline is communicated with the feed inlet above the regeneration tower; a heat source inlet is provided in the middle and lower part of the regeneration tower; a discharge pipeline and a discharge branch pipeline are provided at the bottom of the regeneration tower; the discharge branch pipeline is communicated with the tube-side inlets of each reboiler; the tube-side outlets of each reboiler are communicated with the heat source inlet; each reboiler is connected in parallel with each other; and the purge pipeline is communicated with the tube-side inlets of each reboiler.

[0004] However, the device provided by the related technology uses a carbonate solution to absorb carbon dioxide. The carbonate solution that has absorbed carbon dioxide becomes a rich carbonate solution and loses its ability to absorb carbon dioxide. Continuously supplementing fresh carbonate solution is too costly for production, and the treatment of production waste liquid is also rather troublesome. Summary of the Invention

[0005] The regeneration device and system for decarbonization solution of an ethylene oxide plant provided by the present invention can at least solve the technical problems that the device provided by the related technology uses a carbonate solution to absorb carbon dioxide, the carbonate solution that has absorbed carbon dioxide becomes a rich carbonate solution and loses its ability to absorb carbon dioxide, continuously supplementing fresh carbonate solution is too costly for production, and the treatment of production waste liquid is also rather troublesome.

[0006] The specific solutions of the regeneration device and system for decarbonization solution of an ethylene oxide plant provided by the present invention are as follows:

[0007] On the one hand, a regeneration device for decarbonization solution of an ethylene oxide plant is provided, including:

[0008] A turbine for converting the energy of the rich carbonate solution after absorbing carbon dioxide;

[0009] A first flash unit connected to the turbine;

[0010] At least two-stage regeneration units, wherein the two-stage regeneration units include:

[0011] At least two groups of pressurized regeneration units, connected to the first flash unit, for performing the first regeneration on the carbonic acid-rich solution, and the regeneration pressure of each group of pressurized regeneration units increases sequentially;

[0012] At least two groups of atmospheric pressure regeneration units, connected to the pressurized regeneration units, for performing the second regeneration on the carbonic acid-rich solution, and the regeneration pressure of each group of atmospheric pressure regeneration units increases sequentially;

[0013] A second flash unit, connected to the bottom of the atmospheric pressure regeneration unit;

[0014] Wherein, the regeneration pressure in the pressurized regeneration unit is greater than the regeneration pressure in the atmospheric pressure regeneration unit.

[0015] In an optional embodiment, a first reboiler unit and a second reboiler unit are further included;

[0016] The first reboiler unit is connected to the bottom of the pressurized regeneration unit;

[0017] The second reboiler unit is connected to the bottom of the atmospheric pressure regeneration unit.

[0018] In an optional embodiment, an absorption tower is further included;

[0019] The absorption tower is filled with a carbonic acid solution for absorbing carbon dioxide in ethylene oxide;

[0020] The bottom of the absorption tower is connected to the turbine;

[0021] The regeneration liquid generated by the pressurized regeneration unit and the regeneration liquid generated by the atmospheric pressure regeneration unit enter the absorption tower through pipelines for reuse.

[0022] In an optional embodiment, a group of pressurized regeneration units includes: a pressurized regeneration tower, a pressure sensor and a first control valve;

[0023] The pressurized regeneration tower is connected to the first flash unit;

[0024] The pressure sensor is arranged on the pressurized regeneration tower;

[0025] The first control valve is arranged between the pressurized regeneration tower and the first flash unit.

[0026] In an optional embodiment, a group of atmospheric pressure regeneration units includes: an atmospheric pressure regeneration tower, a pressure sensor and a second control valve;

[0027] The atmospheric pressure regeneration tower is connected to the pressurized regeneration unit;

[0028] The pressure sensor is disposed on the atmospheric pressure regeneration tower;

[0029] The second control valve is disposed between the atmospheric pressure regeneration tower and the pressurized regeneration unit.

[0030] In an alternative embodiment, it further includes obtaining the carbon dioxide content in the rich carbonic acid solution regenerated by the last pressurized regeneration unit; and

[0031] Determining the number of the atmospheric pressure regeneration units based on the carbon dioxide content in the rich carbonic acid solution regenerated by the last pressurized regeneration unit.

[0032] In an alternative embodiment, it further includes a carbon dioxide detection unit and a control unit;

[0033] The carbon dioxide detection unit is used to detect the carbon dioxide content in the carbonic acid solution regenerated by the atmospheric pressure regeneration unit; and

[0034] The control unit is used to, when the carbon dioxide content in the carbonic acid solution regenerated by the atmospheric pressure regeneration unit is greater than a preset content, continue to regenerate the carbonic acid solution regenerated by the atmospheric pressure regeneration unit by sequentially passing through the pressurized regeneration unit and the atmospheric pressure regeneration unit through a pipeline.

[0035] In an alternative embodiment, the regeneration pressure of the atmospheric pressure regeneration unit is 0.01 Mpa - 0.015 Mpa;

[0036] The regeneration pressure of the pressurized regeneration unit is 0.1 Mpa - 0.15 Mpa;

[0037] The number of trays in the atmospheric pressure regeneration unit is less than the number of trays in the pressurized regeneration unit.

[0038] In an alternative embodiment, the temperature of the first flash unit is less than the temperature of the second flash unit.

[0039] On the other hand, there is also provided a regeneration system for the decarbonization solution of an ethylene oxide device, and the system includes the regeneration device for the decarbonization solution of the ethylene oxide device according to any one of the above embodiments.

[0040] By means of the above technical solution, the regeneration device of the present invention has at least the following advantages:

[0041] The regeneration device provided by the embodiment of the present invention performs energy conversion on the rich carbonic acid solution after absorbing carbon dioxide through a turbine. By setting two flash units (the first flash unit and the second flash unit) to perform two-stage flashing on the rich carbonic acid solution, the regeneration effect of the rich carbonic acid solution can be improved; the rich carbonic acid solution after absorbing carbon dioxide is regenerated through at least two-stage regeneration units, so that the rich carbonic acid solution after absorbing carbon dioxide can continue to be used after removing carbon dioxide, without continuously supplementing new carbonic acid solution during the carbon dioxide adsorption process, reducing the production volume of production waste liquid, reducing the carbon dioxide treatment cost and reducing environmental pollution at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic structural diagram of the regeneration device for the decarbonized solution of the ethylene oxide device provided by the embodiment of the present invention.

[0043] Figure 2 It is a schematic structural diagram of the pressurized regeneration tower provided by the embodiment of the present invention.

[0044] Reference Signs:

[0045] 1 - turbine, 2 - first flash unit, 3 - pressurized regeneration tower, 31 - first tray, 32 - second tray, 4 - atmospheric pressure regeneration tower, 5 - second flash unit, 6 - first reboiler, 7 - second reboiler, 8 - absorption tower. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following is a detailed description in conjunction with the accompanying drawings and preferred embodiments.

[0047] Please refer to Figure 1 , the embodiment of the present invention provides a regeneration device for the decarbonized solution of an ethylene oxide device, including: a turbine 1, a first flash unit 2, at least two-stage regeneration units, and a second flash unit 5. Among them, the turbine 1 is used to perform energy conversion on the rich carbonic acid solution after absorbing carbon dioxide; the first flash unit 2 is connected to the turbine 1; at least two-stage regeneration units, where the two-stage regeneration units include: at least two groups of pressurized regeneration units, the pressurized regeneration units are connected to the first flash unit 2 to perform the first regeneration on the rich carbonic acid solution, and the regeneration pressure of each group of pressurized regeneration units increases sequentially; at least two groups of atmospheric pressure regeneration units, the atmospheric pressure regeneration units are connected to the pressurized regeneration units to perform the second regeneration on the rich carbonic acid solution, and the regeneration pressure of each group of atmospheric pressure regeneration units increases sequentially; the second flash unit 5 is connected to the bottom of the atmospheric pressure regeneration unit; among them, the regeneration pressure in the pressurized regeneration unit is greater than the regeneration pressure in the atmospheric pressure regeneration unit.

[0048] The regeneration device provided by the embodiments of the present invention performs energy conversion on the rich carbonic acid solution after absorbing carbon dioxide through the turbine 1. By setting two flash units (the first flash unit 2 and the second flash unit 5), the rich carbonic acid solution is flash-vaporized twice, which can improve the regeneration effect of the rich carbonic acid solution; through at least two-stage regeneration units, the rich carbonic acid solution after absorbing carbon dioxide is regenerated, so that the rich carbonic acid solution after absorbing carbon dioxide can continue to be used after removing carbon dioxide, without continuously supplementing new carbonic acid solution during the carbon dioxide adsorption process, reducing the production volume of production waste liquid, reducing the carbon dioxide treatment cost and reducing environmental pollution at the same time.

[0049] The rich carbonic acid solution provided by the present invention refers to the carbonic acid solution that has absorbed carbon dioxide in the absorption tower 8, simply referred to as the rich carbonic acid solution.

[0050] Further, the working principle of the turbine 1 provided by the regeneration device of the embodiments of the present invention is a machine that converts the energy contained in a fluid medium (the rich carbonic acid solution of the present invention) into mechanical work. The main component of the turbine 1 is a rotating element (rotor or impeller), which is installed on the turbine shaft and has blades arranged uniformly along the circumference. The energy possessed by the fluid (the rich carbonic acid solution of the present invention) is converted into kinetic energy when flowing through the nozzle, and when the fluid flows through the rotor, it impacts the blades, pushing the rotor to rotate, thereby driving the turbine shaft to rotate.

[0051] The first flash unit 2 is connected to the turbine 1 and can perform the first flash-vaporization on the rich carbonic acid solution that has undergone energy conversion by the turbine 1. Specifically, the first flash unit 2 can be a first flash tank, and a large amount of carbon dioxide in the rich carbonic acid solution overflows through flash-vaporization in the first flash tank, initially reducing the carbon dioxide content in the rich carbonic acid solution.

[0052] The pressurized regeneration unit can be a pressurized regeneration tower 3. The number of the pressurized regeneration towers 3 provided by the embodiments of the present invention can be set according to the flow rate of the rich carbonic acid solution to be regenerated or according to actual needs. For example, one or two groups of pressurized regeneration towers 3 can be set, and the pressure of each group of pressurized regeneration towers 3 increases sequentially along the direction from the pressurized regeneration unit to the atmospheric pressure regeneration unit.

[0053] The atmospheric pressure regeneration unit can be an atmospheric pressure regeneration tower 4. The number of the atmospheric pressure regeneration towers 4 provided by the embodiments of the present invention can be set according to the flow rate of the rich carbonic acid solution to be regenerated or according to actual needs. For example, one or two groups of atmospheric pressure regeneration towers 4 can be set, and the pressure of each group of atmospheric pressure regeneration towers 4 increases sequentially along the direction from the pressurized regeneration unit to the atmospheric pressure regeneration unit.

[0054] Please refer to Figure 2, in an alternative embodiment, the number of trays in the pressurized regeneration column 3 is greater than that in the atmospheric pressure regeneration column 4. The trays in the pressurized regeneration column 3 include a first tray 31 and a second tray 32, and the first tray 31 and the second tray 32 are arranged in a staggered layout. In this way, the flow resistance of the fluid can be reduced, the flow rate of the fluid can be increased, and thus the desorption efficiency of carbon dioxide in the rich carbonic acid solution can be improved. When there are at least two groups of pressurized regeneration columns 3, the distance between the trays in the two groups of pressurized regeneration columns 3 increases in sequence, and thus the contact times and contact area between the rich carbonic acid solution and the desorbent are increased by increasing the number of trays, thereby improving the regeneration efficiency.

[0055] In an alternative embodiment, the height of the atmospheric pressure regeneration column 4 is lower than that of the pressurized regeneration column 3, and the number of trays in the atmospheric pressure regeneration column 4 is less than that in the pressurized regeneration column 3. The trays in the atmospheric pressure regeneration column 4 include a third tray and a fourth tray, and the third tray and the fourth tray are arranged in a staggered layout. In this way, the flow resistance of the fluid can be reduced, the flow rate of the fluid can be increased, and thus the desorption efficiency of carbon dioxide in the rich carbonic acid solution can be improved. Among them, the schematic diagram of the staggered layout of the third tray and the fourth tray is the same as the tray layout of the pressurized regeneration column 3, and the tray layout of the pressurized regeneration column 3 can be referred to. When there are at least two groups of atmospheric pressure regeneration columns 4, the distance between the trays in the two groups of atmospheric pressure regeneration columns 4 increases in sequence, and thus the contact times and contact area between the rich carbonic acid solution and the desorbent are increased by increasing the number of trays, thereby improving the regeneration efficiency.

[0056] In an alternative embodiment, the regeneration pressure of the atmospheric pressure regeneration unit is 0.01 Mpa - 0.015 Mpa; the regeneration pressure of the pressurized regeneration unit is 0.1 Mpa - 0.15 Mpa; the number of trays in the atmospheric pressure regeneration unit is less than that in the pressurized regeneration unit.

[0057] In an alternative embodiment, the regeneration device provided by the embodiment of the present invention further includes a first reboiling unit and a second reboiling unit; the first reboiling unit is connected to the bottom of the pressurized regeneration unit; the second reboiling unit is connected to the bottom of the atmospheric pressure regeneration unit.

[0058] Further, the first reboiling unit and the second reboiling unit can be a first reboiler 6 and a second reboiler 7. The first reboiler 6 is arranged at the bottom of the pressurized regeneration unit (for example, the bottom of the pressurized regeneration column 3), and the second reboiler 7 is arranged at the bottom of the atmospheric pressure regeneration unit (for example, the bottom of the atmospheric pressure regeneration column 4)

[0059] In an alternative embodiment, the number of the first reboiling units is 1 - 4; the number of the second reboiling units is 1 - 4. The embodiment of the present invention can set the number of the first reboiling unit and the second reboiling unit according to needs.

[0060] In an alternative embodiment, the embodiment of the present invention further includes an absorption tower 8; the absorption tower 8 is filled with a carbonic acid solution for absorbing carbon dioxide in ethylene oxide; the bottom of the absorption tower 8 is connected to the turbine 1; the regenerated liquid generated by the pressurized regeneration unit and the regenerated liquid generated by the atmospheric pressure regeneration unit enter the absorption tower 8 through pipelines for reuse.

[0061] In an alternative embodiment, a set of pressurized regeneration units includes: a pressurized regeneration tower 3, a first pressure sensor, and a first control valve; the pressurized regeneration tower 3 is connected to the first flash evaporation unit 2; the first pressure sensor is disposed on the pressurized regeneration tower 3; the first control valve is disposed between the pressurized regeneration tower 3 and the first flash evaporation unit 2.

[0062] By setting the first pressure sensor, the pressure of the pressurized regeneration tower 3 in each set of pressurized regeneration units can be sensed in real time, and then the pressure in the next set of pressurized regeneration towers 3 can be determined based on the pressure in the current set of pressurized regeneration towers 3. Exemplarily, when the pressure in the first set of pressurized regeneration towers 3 is 0.1 Mpa, the content of carbon dioxide in the carbonic acid solution regenerated from the first set of pressurized regeneration towers 3 is still higher than the preset content. At this time, it is necessary to increase the pressure in the second set of pressurized regeneration towers 3. For example, the pressure in the second set of pressurized regeneration towers 3 is increased to 0.3 Mpa to improve the regeneration efficiency of the carbonic acid-rich solution.

[0063] In an alternative embodiment, a set of atmospheric pressure regeneration units includes: an atmospheric pressure regeneration tower 4, a second pressure sensor, and a second control valve; the atmospheric pressure regeneration tower 4 is connected to the pressurized regeneration unit; the second pressure sensor is disposed on the atmospheric pressure regeneration tower 4; the second control valve is disposed between the atmospheric pressure regeneration tower 4 and the pressurized regeneration unit.

[0064] By setting the second pressure sensor, the pressure of the atmospheric pressure regeneration tower 4 in each set of atmospheric pressure regeneration units can be sensed in real time, and then the pressure in the next set of atmospheric pressure regeneration towers 4 can be determined based on the pressure in the current set of atmospheric pressure regeneration towers 4. Exemplarily, when the pressure in the first set of atmospheric pressure regeneration towers 4 is 0.1 Mpa, the content of carbon dioxide in the carbonic acid solution regenerated from the first set of atmospheric pressure regeneration towers 4 is still higher than the preset content. At this time, it is necessary to increase the pressure in the second set of atmospheric pressure regeneration towers 4. For example, the pressure in the second set of atmospheric pressure regeneration towers 4 is increased to 0.3 Mpa to improve the regeneration efficiency of the carbonic acid-rich solution.

[0065] In an alternative embodiment, it further includes obtaining the content of carbon dioxide in the carbonic acid-rich solution regenerated by the last pressurized regeneration unit; and determining the number of atmospheric pressure regeneration units based on the content of carbon dioxide in the carbonic acid-rich solution regenerated by the last pressurized regeneration unit.

[0066] Further, the content of carbon dioxide in the carbonic acid-rich solution can be detected. The method for detecting the carbon dioxide content can adopt the phenolphthalein indicator method or the calcium hydroxide method. The embodiments of the present invention are not limited to this detection method. When the content of carbon dioxide in the carbonic acid-rich solution regenerated in the last pressurized regeneration unit is lower than a preset content (for example, 10 mg / ML), there is no need to detect the carbonic acid-rich solution anymore. If the content of carbon dioxide in the carbonic acid-rich solution regenerated in the last pressurized regeneration unit is higher than the preset content (for example, 10 mg / ML), it is necessary to continue to detect the carbonic acid-rich solution. At this time, the number of atmospheric pressure regeneration units needs to be increased. For example, the number of the former atmospheric pressure regeneration units is increased by 1, and the number of the latter atmospheric pressure regeneration units is 2.

[0067] In an optional embodiment, it further includes a carbon dioxide detection unit and a control unit; the carbon dioxide detection unit is used to detect the content of carbon dioxide in the carbonic acid solution regenerated from the atmospheric pressure regeneration unit; and the control unit is used to, when the content of carbon dioxide in the carbonic acid solution regenerated from the atmospheric pressure regeneration unit is greater than the preset content, continue to regenerate the carbonic acid solution regenerated from the atmospheric pressure regeneration unit by sequentially entering a pressurized regeneration unit and an atmospheric pressure regeneration unit through a pipeline.

[0068] The carbonic acid solution regenerated by the regeneration device provided by the embodiments of the present invention will continue to return to the absorption tower 8 to absorb carbon dioxide. The preset content of carbon dioxide in the regenerated carbonic acid solution can be set according to actual needs, and the embodiments of the present invention do not limit this. By setting the carbon dioxide detection unit and the control unit, when the content of carbon dioxide detected by the carbon dioxide detection unit in the carbonic acid solution regenerated from the atmospheric pressure regeneration unit exceeds the preset content, the carbonic acid solution regenerated from the atmospheric pressure regeneration unit can be continuously regenerated by sequentially entering a pressurized regeneration unit and an atmospheric pressure regeneration unit through the control unit, thereby improving the regeneration efficiency in sequence.

[0069] In an optional embodiment, the temperature of the first flash evaporation unit 2 is lower than the temperature of the second flash evaporation unit 5.

[0070] The following further describes the present invention in detail with specific embodiments:

[0071] Embodiment 1: The volume flow rate of the carbonate-rich solution at the bottom of the absorption tower 8 in the decarbonization unit of an ethylene oxide plant is 901.24 m3 / h, the mass flow rate is 1,135,567.7 Kg / h, the temperature is 70 °C, and the pressure is 2.38 MPa A. After the solution is regenerated by the method of the present invention and returned to the absorption tower 8, the volume flow rate of the carbonate solution is 900 m3 / h, the mass flow rate is 1,125,000 Kg / h, and the lost weight is the carbon dioxide discharged during the regeneration process.

[0072] Example 2: The volume flow rate of the rich carbonate solution at the bottom of the absorption tower 8 in a certain ethylene oxide unit's decarbonization unit is 253.3 m3 / h, the mass flow rate is 290587.9 Kg / h, the temperature is 108.8 °C, and the pressure is 1.82 MPa A. After the solution is regenerated using the method of the present invention, the volume flow rate of the carbonate solution returned to the absorption tower 8 is 250 m3 / h, the mass flow rate is 283750 Kg / h, and the lost weight is the carbon dioxide discharged during the regeneration process.

[0073] From Example 1 and Example 2, it can be seen that the device provided by the embodiments of the present invention can handle rich carbonic acid solutions with a large volume flow rate. The concentration of the carbonic acid solution before absorbing carbon dioxide is 15% - 25% (wt%), and the concentration of the treated rich carbonic acid solution is also 15% - 25% (wt%). That is, while removing carbon dioxide, it does not affect the concentration of the carbonic acid solution and does not affect its subsequent continued use, and the regeneration efficiency is high.

[0074] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make some changes or modifications using the above-disclosed methods and technical content as equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A regeneration device for decarbonization solution of an ethylene oxide device, characterized in that: include: A turbine for converting energy from the carbonic acid-rich solution after absorbing carbon dioxide; a first flash unit connected to the turbine; At least two-stage regeneration unit, wherein the two-stage regeneration unit comprises: At least two groups of pressurized regeneration units are connected to the first flash unit to perform a first regeneration of the carbonic acid-rich solution, and the regeneration pressure of each group of pressurized regeneration units is increased sequentially; At least two groups of normal pressure regeneration units are connected to the pressurized regeneration unit to perform a second regeneration of the carbonic acid-rich solution, and the regeneration pressure of each group of normal pressure regeneration units is increased sequentially; A second flash unit connected to the bottom of the atmospheric regeneration unit; Wherein, the regeneration pressure in the pressurized regeneration unit is greater than the regeneration pressure in the normal pressure regeneration unit.

2. The regeneration device for decarbonization solution of ethylene oxide device according to claim 1, characterized in that: Also included is a first reboiler unit and a second reboiler unit; The first reboiler unit is connected to the bottom of the pressurized regeneration unit; The second reboiler unit is connected to the bottom of the atmospheric regeneration unit.

3. The regeneration device for decarbonization solution of ethylene oxide device according to claim 1, characterized in that: Also includes an absorption tower; The absorption tower is filled with a carbonic acid solution for absorbing carbon dioxide in ethylene oxide; The bottom of the absorption tower is connected to the turbine; The regeneration liquid produced by the pressurized regeneration unit and the regeneration liquid produced by the normal pressure regeneration unit enter the absorption tower through a pipeline for reuse.

4. The regeneration device for decarbonization solution of ethylene oxide device according to claim 1, characterized in that: A set of pressurized regeneration units includes: a pressurized regeneration tower, a pressure sensor and a first control valve; The pressurized regeneration tower is connected to the first flash unit; The pressure sensor is arranged on the pressurized regeneration tower; The first control valve is disposed between the pressurized regeneration tower and the first flash unit.

5. The regeneration device for decarbonization solution of ethylene oxide device according to claim 1, characterized in that: A set of atmospheric pressure regeneration units includes: an atmospheric pressure regeneration tower, a pressure sensor and a second control valve; The atmospheric regeneration tower is connected to the pressurized regeneration unit; The pressure sensor is arranged on the atmospheric regeneration tower; The second control valve is disposed between the normal pressure regeneration tower and the pressurized regeneration unit.

6. The regeneration device for decarbonization solution of ethylene oxide device according to claim 1, characterized in that: It also includes obtaining the carbon dioxide content in the carbonic acid-rich solution regenerated by the last pressurized regeneration unit; and The number of the atmospheric pressure regeneration units is determined based on the carbon dioxide content in the carbonic acid-rich solution regenerated by the last pressurized regeneration unit.

7. The regeneration device for decarbonization solution of ethylene oxide device according to claim 1, characterized in that: Also includes a carbon dioxide detection unit and a control unit; The carbon dioxide detection unit is used to detect the content of carbon dioxide in the carbonic acid solution regenerated from the normal pressure regeneration unit; and The control unit is used to allow the carbonated solution regenerated from the normal pressure regeneration unit to continue to enter the pressurized regeneration unit and the normal pressure regeneration unit in sequence through the pipeline for regeneration when the carbon dioxide content in the carbonated solution regenerated from the normal pressure regeneration unit is greater than a preset content.

8. The regeneration device for decarbonization solution of ethylene oxide device according to claim 1 or 2, characterized in that: The regeneration pressure of the normal pressure regeneration unit is 0.01Mpa-0.015Mpa; The regeneration pressure of the pressurized regeneration unit is 0.1Mpa-0.15Mpa; The number of plates in the atmospheric regeneration unit is smaller than the number of plates in the pressurized regeneration unit.

9. The regeneration device for decarbonization solution of ethylene oxide device according to any one of claims 1 to 7, characterized in that: The temperature of the first flash unit is lower than the temperature of the second flash unit.

10. A regeneration system for decarbonization solution of an ethylene oxide device, characterized in that: The system comprises a regeneration device for the decarbonation solution of an ethylene oxide device as described in any one of claims 1 to 9.

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