Heating regeneration and injection regeneration coupled amine liquid decarbonization system

Abstract

The utility model discloses a heating regeneration and injection regeneration coupled amine liquid decarbonization system, and belongs to the technical field of energy conservation and environmental protection. The utility model solves the problem of high energy consumption caused by the fact that the heated and regenerated lean amine solution needs to be cooled through a cooling tower before entering an absorption tower in order to ensure that the lean amine solution has high absorption capacity in the absorption tower in the conventional decarbonization system. A second amine liquid outlet of the regeneration tower is connected to an inlet of the flash evaporator, an amine liquid outlet of the flash evaporator is connected to a lean amine liquid inlet of the absorption tower, the ejector is provided with a driving steam inlet and a flash steam inlet, the flash steam inlet is communicated with a flash steam outlet of the flash evaporator, and a nozzle of the ejector is connected to a steam inlet of the reboiler. The decarburization cycle of the amine liquid is completed with low energy consumption, and the steam consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of heating regeneration and injection regeneration coupling's amine liquid decarbonization system, belong to energy-saving and environmental protection technical field. BACKGROUND

[0002] Traditional decarbonization system is heating regeneration, mainly using amine liquid (MEDA) as absorbent, and through steam as heat source to regenerate rich amine liquid, overall energy consumption is relatively high, need a large amount of high-quality steam as the power source of rich amine liquid regeneration. However, heating regeneration can lead to the temperature level of lean amine liquid is higher, before entering absorption tower, it still needs to be cooled by cooling tower etc. Means, to make lean amine liquid have higher absorption capacity in absorption tower. Conventional technical route needs to consume a large amount of high-quality steam, energy consumption is relatively large.

[0003] Amine liquid (MEDA) in the interval of lower temperature, its solubility increases, therefore, regenerated amine liquid (MEDA) generally needs to be cooled by cooling water of cooling tower, cooling tower consumes electric energy and wastes the heat energy of amine liquid (MEDA) in this process. SUMMARY

[0004] The utility model discloses in order to solve the problem that the existing conventional decarbonization system, in order to guarantee lean amine liquid in absorption tower has higher absorption capacity, heating regeneration after lean amine liquid enters absorption tower before still needs to be cooled by cooling tower, and then lead to the problem of higher energy consumption, and then provide a kind of heating regeneration and injection regeneration coupling's amine liquid decarbonization system.

[0005] The utility model discloses the technical scheme that the above technical problem is solved is as follows:

[0006] A kind of heating regeneration and injection regeneration coupling's amine liquid decarbonization system, including regenerator, flash evaporator and injector, the second amine liquid outlet of regenerator is connected to the inlet of flash evaporator, the amine liquid outlet of flash evaporator is connected to the lean amine liquid inlet of absorption tower, and drive steam inlet and flash evaporation steam inlet are provided on the injector, and flash evaporation steam inlet is communicated with the flash evaporation steam outlet of flash evaporator, and the spout of injector is connected to the steam inlet of reboiler.

[0007] Further, the rich amine liquid outlet of absorption tower is connected and is provided with flash tank between the first amine liquid inlet of regenerator.

[0008] Further, the carbon dioxide outlet of regenerator is connected to diffusion tower.

[0009] Further, the gas outlet of flash tank is connected to diffusion tower.

[0010] Further, the steam outlet of reboiler is connected to diffusion tower.

[0011] Further, a lean liquid circulating pump group is arranged between the amine liquid outlet of the flash tank and the lean amine liquid inlet of the absorption tower.

[0012] Further, a circulating pipeline is arranged between the bottom of the regeneration tower and the lower part of the regeneration tower, and a lean liquid filtering pump and a filter are arranged on the circulating pipeline.

[0013] Further, a condensed water discharge port is arranged in communication with the bottom of the reboiler.

[0014] Further, the flash pressure of the flash tank ranges from 30 to 50 kPa.a, and the flash pressure of the flash tank ranges from 1.7 to 4.2 kPa.a.

[0015] Compared with the prior art, the amine liquid decarburization system has the following effects:

[0016] The amine liquid decarburization system coupled with heating regeneration and ejection regeneration can realize low-energy-consumption decarburization circulation of amine liquid and reduce steam consumption.

[0017] The amine liquid decarburization system coupled with heating regeneration and ejection regeneration places the flash procedure between the regeneration tower and the absorption tower, and after the regeneration of rich amine liquid in the regeneration tower, the carbon dioxide solubility characteristics of amine liquid are utilized to rapidly reduce the carbon dioxide solubility of amine liquid in a low-temperature and low-pressure working condition interval, at this time, high vacuum is applied to realize further decarburization, and due to the heat absorption principle of liquid evaporation, the amine liquid temperature is further reduced in the process of vacuum decarburization, thereby effectively reducing energy consumption.

[0018] The amine liquid decarburization system coupled with heating regeneration and ejection regeneration increases injection on the basis of traditional heating regeneration, and the gas mixed by steam and carbon dioxide is used as a heat source of the reboiler. That is, by the principle of injection and flash, the heat release amount of lean amine liquid cooling is recovered while reducing the lean amine liquid temperature, and the steam consumption of the reboiler is reduced, thereby effectively reducing the heat cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The amine liquid decarburization system coupled with heating regeneration and ejection regeneration is a composition schematic diagram.

[0020] In the figure, 1 is an absorption tower, 1-1 is a rich amine liquid outlet, 1-2 is a lean amine liquid inlet, 2 is a regeneration tower, 2-1 is a first amine liquid inlet, 2-2 is a second amine liquid inlet, 2-3 is a first amine liquid outlet, 2-4 is a second amine liquid outlet, 3 is a reboiler, 4 is a flash tank, 5 is an ejector, 5-1 is a driving steam inlet, 6 is a flash tank, 7 is a diffusion tower, 8 is a lean liquid circulating pump group, 9 is a lean liquid filtering pump, and 10 is a filter. DETAILED DESCRIPTION

[0021] DETAILED DESCRIPTION Figure 1 It should be noted that the embodiments of the present application are described in detail, and the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] It should be noted that the descriptions of the present application with respect to "front", "rear", "left", "right", "inner", "outer", "left side", "right side", "upper part", "lower part", "top", "bottom" and the like are defined based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the described structure must be constructed and operated in a particular orientation. Therefore, it cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0023] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] The amine liquid decarburization system coupled with heating regeneration and ejector regeneration comprises a regeneration tower 2, a flash evaporator 4 and an ejector 5, the second amine liquid outlet 2-4 of the regeneration tower 2 is connected to the inlet of the flash evaporator 4, the amine liquid outlet of the flash evaporator 4 is connected to the lean amine liquid inlet 1-2 of the absorption tower 1, the driving steam inlet 5-1 and the flash steam inlet are arranged on the ejector 5, the flash steam inlet is communicated with the flash steam outlet of the flash evaporator 4, and the nozzle of the ejector 5 is connected to the steam inlet of the reboiler 3.

[0025] The absorption tower 1, the regeneration tower 2 and the reboiler 3 are all the component structures of the existing heating regeneration decarburization system, wherein the rich amine liquid outlet 1-1 of the absorption tower 1 is communicated with the first amine liquid inlet 2-1 of the regeneration tower 2, the first amine liquid outlet 2-3 and the second amine liquid inlet 2-2 of the regeneration tower 2 are respectively communicated with the heat absorption side of the reboiler 3 through pipelines.

[0026] The regenerated tower 2 discharges the semi-lean amine liquid into the flash evaporator 4, realizes vacuum regeneration of the semi-lean amine liquid in the low-temperature section, effectively reduces the overall system energy consumption, and expands the decarburization capacity of the system, that is, through the amine liquid decarburization system coupled by heating regeneration and ejection regeneration, the decarburization cycle of the amine liquid can be completed with low energy consumption, and the steam consumption is reduced.

[0027] The amine liquid decarburization system coupled by heating regeneration and ejection regeneration of the utility model is based on the existing conventional heating regeneration decarburization system, and the flash evaporation process is arranged between the regenerated tower 2 and the absorption tower 1, after the regeneration of the rich amine liquid through the regenerated tower 2, the carbon dioxide solubility characteristics of the amine liquid are utilized, the amine liquid environment pressure rapidly decreases in the low-temperature and low-pressure working condition interval, the carbon dioxide solubility rapidly decreases, at this time, high vacuum is applied to realize further mass decarburization, and due to the liquid evaporation heat absorption principle, the amine liquid temperature is further reduced in the vacuum decarburization process, and then the energy consumption is effectively reduced.

[0028] The amine liquid decarburization system coupled by heating regeneration and ejection regeneration of the utility model increases the injection on the basis of the traditional heating regeneration, and the gas mixed by steam and carbon dioxide is used as the heat source of the reboiler 3, that is, through the principle of injection and flash evaporation, the heat release amount of the lean amine liquid during temperature reduction is recovered, the corresponding steam consumption of the reboiler 3 is reduced, and the heat cost is effectively reduced.

[0029] The flash tank 6 is arranged between the rich amine liquid outlet 1-1 of the absorption tower 1 and the first amine liquid inlet 2-1 of the regenerated tower 2, so that the first expansion and temperature reduction are realized before the regenerated tower 2, and a small amount of carbon dioxide and water vapor is discharged.

[0030] The carbon dioxide outlet of the regenerated tower 2 is connected to the emission tower 7, so that the gas released from the regenerated tower 2 is discharged and treated through the emission tower 7.

[0031] The gas outlet of the flash tank 6 is connected to the emission tower 7, so that the gas released from the flash tank 6 is discharged and treated through the setting of the emission tower 7.

[0032] The steam outlet of the reboiler 3 is connected to the emission tower 7, so that the high-temperature steam used by the reboiler 3 contains the flash evaporation steam of the flash evaporator 4, and a part of the carbon dioxide flashed out from the lean amine liquid is discharged and treated through the emission tower 7 after heat release.

[0033] The lean liquid circulating pump set 8 is arranged between the amine liquid outlet of the flash evaporator 4 and the lean amine liquid inlet 1-2 of the absorption tower 1.

[0034] The circulation pipeline is arranged between the bottom of the regeneration tower 2 and the lower part of the regeneration tower 2, and the lean liquid filtering pump 9 and the filter 10 are arranged on the circulation pipeline.

[0035] The bottom of the reboiler 3 is communicated with the condensate water discharge port. In this way, the high-temperature steam is condensed after heat release in the reboiler 3 and discharged out of the system through the condensate water discharge port.

[0036] Working principle:

[0037] 1. Rich amine liquid system process: The lean amine liquid with low temperature absorbs the carbon dioxide in the raw blast furnace gas in the absorption tower 1, purifies the raw blast furnace gas, enters the flash tank 6, and is expanded and cooled for the first time. After a small amount of carbon dioxide and water vapor is discharged, the lean amine liquid enters the regeneration tower 2. The amine liquid in the upper part of the regeneration tower 2 flows into the reboiler 3, is heated by the water vapor and carbon dioxide mixed gas from the outlet of the ejector 5, and then enters the lower part of the regeneration tower 2. After the exhaust gas is regenerated, the lean amine liquid is discharged.

[0038] 2. Lean amine liquid system process: The lean amine liquid discharged from the regeneration tower 2 enters the flash evaporator 4. The flash evaporator 4 maintains negative pressure through the steam injection of the ejector 5. The lean amine liquid in the flash evaporator 4 is flashed and cooled in the negative pressure environment. The flashed water vapor is mixed with the driving steam of the ejector 5 and heated. The cooled lean amine liquid is pumped back to the absorption tower 1 by the amine liquid pump set. In this way, the absorption and regeneration are repeated.

[0039] 3. Steam process: The steam enters the ejector 5, is mixed with the flashed steam in the flash evaporator 4, enters the reboiler 3 to heat the amine liquid at the outlet of the upper part of the regeneration tower 2, and the condensed water after heat release is discharged out of the system. The non-condensed carbon dioxide is discharged into the diffusion tower 7.

[0040] 4. Blast furnace gas system process: The blast furnace gas enters the absorption tower 1, and the carbon dioxide is removed and purified by the lean amine liquid, and then discharged.

[0041] The above is only the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An amine liquid decarbonation system coupled with heating regeneration and ejector regeneration, characterized in that: The regeneration tower (2), the flash evaporator (4) and the ejector (5) are included, the second amine liquid outlet (2-4) of the regeneration tower (2) is connected to the inlet of the flash evaporator (4), the amine liquid outlet of the flash evaporator (4) is connected to the lean amine liquid inlet (1-2) of the absorption tower (1), the driving steam inlet (5-1) and the flash steam inlet are arranged on the ejector (5), the flash steam inlet is communicated with the flash steam outlet of the flash evaporator (4), and the nozzle of the ejector (5) is connected to the steam inlet of the reboiler (3).

2. The amine liquid decarbonation system coupled with heating regeneration and ejector regeneration according to claim 1, characterized in that: The flash tank (6) is arranged between the rich amine liquid outlet (1-1) of the absorption tower (1) and the first amine liquid inlet (2-1) of the regeneration tower (2).

3. The amine liquid decarbonation system coupled with heating regeneration and ejector regeneration according to claim 1, characterized in that: The carbon dioxide outlet of the regeneration tower (2) is connected to the emission tower (7).

4. The amine liquid decarbonation system coupled with heating regeneration and ejector regeneration according to claim 2, characterized in that: The gas outlet of the flash tank (6) is connected to the emission tower (7).

5. The amine liquid decarbonation system coupled with heating regeneration and ejector regeneration according to claim 1, characterized in that: The steam outlet of the reboiler (3) is connected to the emission tower (7).

6. The amine liquid decarbonation system coupled with heating regeneration and ejector regeneration according to claim 1, characterized in that: The lean liquid circulating pump group (8) is arranged between the amine liquid outlet of the flash evaporator (4) and the lean amine liquid inlet (1-2) of the absorption tower (1).

7. The amine liquid decarbonation system coupled with heating regeneration and ejector regeneration according to claim 1, characterized in that: The circulating pipeline is arranged between the bottom of the regeneration tower (2) and the lower part of the regeneration tower (2), the lean liquid filtering pump (9) and the filter (10) are arranged on the circulating pipeline.

8. The amine liquid decarbonation system coupled with heating regeneration and ejector regeneration according to claim 1, characterized in that: The condensate discharge port is arranged on the bottom of the reboiler (3).

9. The amine liquid decarbonation system coupled with heating regeneration and ejector regeneration according to claim 2, characterized in that: The flash pressure of the flash tank (6) ranges from 30 to 50 kPa.a, and the flash pressure of the flash evaporator (4) ranges from 1.7 to 4.2 kPa.a.

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