Carbon dioxide absorption and regeneration system utilizing waste heat of waste water

Abstract

The utility model discloses a carbon dioxide absorption and regeneration system utilizing waste water waste heat and belongs to the technical field of energy conservation and environmental protection. The system solves the problem of high energy consumption caused by the fact that an existing decarburization system needs a large amount of high-quality steam as a power source for regeneration of the amine-rich liquid. The heat absorption side of the condenser is connected between the first amine liquid outlet of the regeneration tower and the second amine liquid inlet of the regeneration tower through a pipeline, the second amine liquid outlet of the regeneration tower is communicated with the lean amine liquid inlet of the absorption tower, and the flash evaporator is provided with a medium inlet, a medium outlet and a flash steam outlet. And flash steam enters the inlet of the heat release side of the condenser through the flash steam outlet. The waste heat of the waste water is utilized for regeneration of the lean amine solution, high-quality steam does not need to be consumed, energy consumption is greatly reduced, and heat cost is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a carbon dioxide absorption regeneration system using waste water waste heat belongs to energy -conserving and environment -protective technical field. BACKGROUND

[0002] The conventional decarbonization system mainly uses amine liquid (MEDA) as the absorbent, and regenerates the rich amine liquid by using steam as the heat source, and the overall energy consumption is relatively high, and a large amount of high-quality steam is needed as the power source for the regeneration of the rich amine liquid. SUMMARY

[0003] The utility model discloses in order to solve the current decarbonization system needs a large amount of high-quality steam as the power source for the regeneration of the rich amine liquid, leads to the problem of high energy consumption, and further provides a carbon dioxide absorption regeneration system using waste water waste heat.

[0004] The utility model discloses a technical scheme adopted to solve the above technical problems is:

[0005] A carbon dioxide absorption regeneration system using waste water waste heat, comprising a regeneration tower, a condenser and a flash evaporator, wherein,

[0006] The heat absorption side of the condenser is connected by a pipeline between the first amine liquid outlet of the regeneration tower and the second amine liquid inlet of the regeneration tower,

[0007] The second amine liquid outlet of the regeneration tower is communicated with the lean amine liquid inlet of the absorption tower,

[0008] The flash evaporator is provided with a medium inlet, a medium outlet and a flash steam outlet, and the flash steam enters the inlet of the heat release side of the condenser through the flash steam outlet.

[0009] Further, the medium entering the flash evaporator through the medium inlet is blast furnace slag flushing water.

[0010] Further, a flash tank is connected and arranged between the rich amine liquid outlet of the absorption tower and the first amine liquid inlet of the regeneration tower.

[0011] Further, the carbon dioxide outlet of the regeneration tower is connected to the diffuser tower.

[0012] Further, the gas outlet of the flash tank is connected to the diffuser tower.

[0013] Further, a lean liquid circulating pump set is arranged between the second amine liquid outlet of the regeneration tower and the lean amine liquid inlet of the absorption tower.

[0014] Further, a cooler is arranged on the pipeline between the lean liquid circulating pump set and the lean amine liquid inlet of the absorption tower.

[0015] Further, a circulation 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 circulation pipeline.

[0016] Further, the flash tank has a flash pressure range of 30-50 kPa.a, and the flash evaporator has a flash pressure range of 1.7-4.2 kPa.a.

[0017] Compared with the prior art, the present application has the following effects:

[0018] The amine liquid in the upper section of the regeneration tower flows into the condenser through the first amine liquid outlet, absorbs the heat of the flash steam from the flash evaporator, and the rich amine liquid is heated, and after heating, the rich amine liquid is regenerated and releases carbon dioxide, and then the lean amine liquid is discharged.

[0019] The carbon dioxide absorption and regeneration system of the present application cancels the heating mode of the reboiler using steam on the basis of traditional heating and regeneration, and instead uses a direct heating machine for heating, which can realize lean amine liquid regeneration using waste water waste heat, without consuming high-quality steam, greatly reducing energy consumption, and effectively reducing heat cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The present application is a schematic diagram of the composition of the carbon dioxide absorption and regeneration system using waste water waste heat.

[0021] In the drawings:

[0022] 1, absorption tower; 1-1, rich amine liquid outlet; 1-2, lean amine liquid inlet; 2, regeneration tower; 2-1, first amine liquid inlet; 2-2, first amine liquid outlet; 2-3, second amine liquid inlet; 2-4, second amine liquid outlet; 3, condenser; 4, flash evaporator; 4-1, medium inlet; 4-2, medium outlet; 5, flash tank; 6, dispersion tower; 7, lean liquid circulating pump set; 8, cooler; 9, lean liquid filtering pump; 10, filter. DETAILED DESCRIPTION

[0023] Specific implementation method one: combined Figure 1 It is obvious that the described embodiments are only part of the embodiments of the present application, not all the embodiments, and based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] It should be noted that the description of the present application about "front", "back", "left", "right", "inner", "outer", "left side", "right side", "upper part", "lower part", "top", "bottom" and the like are defined based on the position or 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 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 specifically defined.

[0025] In the description of the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "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 intermediate medium, or the communication between the two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] A carbon dioxide absorption and regeneration system using waste water waste heat, comprising a regeneration tower 2, a condenser 3 and a flash evaporator 4, wherein,

[0027] The heat absorption side of the condenser 3 is connected by pipeline between the first amine liquid outlet 2-2 of the regeneration tower 2 and the second amine liquid inlet 2-3 of the regeneration tower 2,

[0028] The second amine liquid outlet 2-4 of the regeneration tower 2 is communicated with the lean amine liquid inlet 1-2 of the absorption tower 1,

[0029] The flash evaporator 4 is provided with a medium inlet 4-1, a medium outlet 4-2 and a flash steam outlet, and the flash steam enters the inlet of the heat release side of the condenser 3 through the flash steam outlet.

[0030] 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.

[0031] The second amine liquid outlet 2-4 of the regeneration tower 2 is a bottom amine liquid outlet.

[0032] The flash evaporator 4 and the condenser 3 form a direct heating machine,

[0033] The amine liquid in the upper section of the regeneration tower 2 flows into the condenser 3 through the first amine liquid outlet 2-2, absorbs the heat of the flash steam from the flash evaporator 4, the rich amine liquid is heated, and after heating, the regeneration is realized, and after releasing carbon dioxide, the lean amine liquid is discharged.

[0034] The flash steam releases heat in the condenser 3 to form condensed water, which is discharged through the outlet of the heat release side of the condenser 3.

[0035] The carbon dioxide absorption regeneration system cancels the heating mode of the reboiler by using steam, and instead uses a direct heating machine to heat, so that waste water waste heat is used for lean amine liquid regeneration, high-quality steam is not consumed, energy consumption is greatly reduced, and heat cost is effectively reduced.

[0036] The waste water entering the flash evaporator 4 through the medium inlet 4-1 can be any waste water heat source with heat recovery value, such as blast furnace slag flushing water in a steel plant.

[0037] The medium entering the flash evaporator 4 through the medium inlet 4-1 is blast furnace slag flushing water.

[0038] 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 are connected and arranged with a flash tank 5.

[0039] The flash pressure range of the flash tank 5 is 30-50kpa.a, and the flash pressure range of the flash evaporator 4 is 1.7-4.2kPa.a.

[0040] The carbon dioxide outlet of the regeneration tower 2 is connected to the emission tower 6.

[0041] The gas outlet of the flash tank 5 is connected to the emission tower 6.

[0042] The second amine liquid outlet 2-4 of the regeneration tower 2 and the lean amine liquid inlet 1-2 of the absorption tower 1 are provided with a lean liquid circulating pump set 7.

[0043] The lean liquid circulating pump set 7 and the lean amine liquid inlet 1-2 of the absorption tower 1 are provided with a cooler 8 on the pipeline.

[0044] The bottom of the regeneration tower 2 and the lower part of the regeneration tower 2 are connected and arranged with a circulating pipeline, and the circulating pipeline is provided with a lean liquid filtering pump 9 and a filter 10.

[0045] Working principle:

[0046] 1. The rich amine liquid system process: the low temperature lean amine liquid absorbs the carbon dioxide in the raw blast furnace gas in the absorption tower 1, purifies the raw blast furnace gas, and then enters the flash tank 5 to perform the first expansion and cooling, and then discharges a small amount of carbon dioxide and water vapor, and then enters the regeneration tower 2. The amine liquid in the upper part of the regeneration tower 2 flows into the condenser 3 of the waste water heat recovery system to absorb the extracted waste water heat. The rich amine liquid is heated, regenerated after heating, and then discharges the lean amine liquid after releasing the carbon dioxide.

[0047] 2. The lean amine liquid system process: the lean amine liquid discharged from the regeneration tower 2 enters the cooler 8 through the lean liquid circulating pump set 7 to cool the lean amine liquid. The cooled lean amine liquid is sent to the absorption tower 1 to form the rich amine liquid. The process is repeated to absorb and regenerate.

[0048] 3. The waste water process: the waste water enters the flash evaporator 4 to flash under negative pressure, generates steam, and then returns to the original system due to the heat absorption of evaporation.

[0049] 4. The blast furnace gas system process: the blast furnace gas enters the absorption tower 1 to remove the carbon dioxide and purify the lean amine liquid.

[0050] The above is only the preferred embodiment 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. A carbon dioxide absorption regeneration system utilizing waste water heat, characterized by: The system comprises a regenerator (2), a condenser (3) and a flasher (4), wherein, The heat absorption side of the condenser (3) is connected by a pipeline between the first amine liquid outlet (2-2) of the regenerator (2) and the second amine liquid inlet (2-3) of the regenerator (2), The second amine liquid outlet (2-4) of the regenerator (2) is communicated with the lean amine liquid inlet (1-2) of the absorber (1), The flasher (4) is provided with a medium inlet (4-1), a medium outlet (4-2) and a flash steam outlet, and the flash steam enters the inlet of the heat release side of the condenser (3) through the flash steam outlet.

2. The carbon dioxide absorption regeneration system using waste water heat according to claim 1, characterized by: The medium entering the flasher (4) through the medium inlet (4-1) is blast furnace slag flushing water.

3. The system for carbon dioxide absorption and regeneration using waste heat according to claim 1, wherein: A flash tank (5) is connected between the rich amine liquid outlet (1-1) of the absorber (1) and the first amine liquid inlet (2-1) of the regenerator (2).

4. The system for carbon dioxide absorption and regeneration using waste heat according to claim 1, wherein: The carbon dioxide outlet of the regenerator (2) is connected to a diffuser tower (6).

5. The system for carbon dioxide absorption and regeneration using waste heat according to claim 3, wherein: The gas outlet of the flash tank (5) is connected to the diffuser tower (6).

6. The system for carbon dioxide absorption and regeneration using waste heat according to claim 1, wherein: A lean liquid circulating pump group (7) is arranged between the second amine liquid outlet (2-4) of the regenerator (2) and the lean amine liquid inlet (1-2) of the absorber (1).

7. The system for carbon dioxide absorption and regeneration using waste heat according to claim 6, wherein: A cooler (8) is arranged on the pipeline between the lean liquid circulating pump group (7) and the lean amine liquid inlet (1-2) of the absorber (1).

8. The system for carbon dioxide absorption and regeneration using waste heat according to claim 1, wherein: A circulating pipeline is connected between the bottom of the regenerator (2) and the lower part of the regenerator (2), and a lean liquid filtration pump (9) and a filter (10) are arranged on the circulating pipeline.

9. The system for carbon dioxide absorption and regeneration using waste heat according to claim 3, wherein: The flash pressure of the flash tank (5) ranges from 30 to 50 kPa.a, and the flash pressure of the flasher (4) ranges from 1.7 to 4.2 kPa.a.

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