Carbon dioxide absorption and regeneration system with zero steam consumption

Abstract

The utility model discloses a zero-steam-consumption carbon dioxide absorption and regeneration 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. 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, and the heat release side of the evaporator is connected between the second amine liquid outlet of the regeneration tower and the lean amine liquid inlet of the absorption tower through a pipeline. Heat released by cooling of lean amine liquid is recycled through circulation of the heat pump system, and then high-quality heat is transferred to amine liquid, needing to be heated, at an outlet of the upper section of the regeneration tower through a condenser of the heat pump system, so that the regeneration tower does not need any steam consumption and investment of cold source equipment, and energy conservation and carbon reduction are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of zero steam consumption's carbon dioxide absorption regeneration system, belong to energy-saving and environmental protection technical field. BACKGROUND

[0002] The conventional decarbonization system mainly uses amine liquid (MEDA) as absorbent, and regenerates rich amine liquid by steam as 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 rich amine liquid regeneration. However, heating regeneration will cause the temperature level of lean amine liquid to be high, and it needs to be cooled by a cooling tower or other means before entering the absorption tower, so that the lean amine liquid has high absorption capacity in the absorption tower. The conventional technical route needs to consume a large amount of high-quality steam, and the energy consumption is relatively large.

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

[0004] The utility model is to solve the problem in the conventional decarbonization system that the lean amine liquid needs to be cooled by a cooling tower before entering the absorption tower in order to ensure that it has high absorption capacity in the absorption tower, thereby providing a zero steam consumption carbon dioxide absorption regeneration system.

[0005] The utility model adopts the following technical scheme to solve the above technical problems:

[0006] A zero steam consumption carbon dioxide absorption regeneration system, comprising a regeneration tower and a heat pump system, wherein the heat pump system comprises a condenser, an expansion valve, an evaporator and a compressor connected in a closed loop,

[0007] 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,

[0008] The heat release side of the evaporator is connected by a pipeline between the second amine liquid outlet of the regeneration tower and the lean amine liquid inlet of the absorption tower.

[0009] 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.

[0010] Further, the carbon dioxide outlet of the regeneration tower is connected to a dispersing tower.

[0011] Further, the gas outlet of the flash tank is connected to the dispersing tower.

[0012] Further, a lean liquid circulating pump group is arranged between the second amine liquid outlet of the regeneration tower and the lean amine liquid inlet of the absorption tower.

[0013] 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.

[0014] Compared with the prior art, the present application has the following effects:

[0015] The amine liquid in the upper section of the regeneration tower flows into the condenser of the heat pump system through the first amine liquid outlet, absorbs the waste heat of the lean amine liquid collected by the heat pump system, and the rich amine liquid is heated to realize regeneration, and after releasing carbon dioxide, the lean amine liquid is discharged.

[0016] The lean amine liquid discharged from the regeneration tower enters the evaporator of the heat pump system, and the heat is transferred to the circulating working medium of the heat pump;

[0017] The carbon dioxide absorption and regeneration system of the present application circulates through the heat pump system, recovers the heat released by the lean amine liquid (MEDA) during cooling, and then transfers the high-quality heat to the amine liquid (MEDA) at the outlet of the upper section of the regeneration tower which needs to be heated through the condenser of the heat pump system, so that the regeneration tower does not need any steam consumption, greatly saving the investment of the cold source equipment for cooling the amine liquid (MEDA) and achieving energy saving and carbon reduction. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The present application is a zero-steam consumption carbon dioxide absorption and regeneration system.

[0019] In the figure:

[0020] 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, expansion valve; 5, evaporator; 6, compressor; 7, flash tank; 8, bleeder tower; 9, lean liquid circulating pump group; 10, lean liquid filtering pump; 11, filter. DETAILED DESCRIPTION

[0021] 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 all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the present application belong to the scope of protection of the present application.

[0022] 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.

[0023] 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 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.

[0024] A zero steam consumption carbon dioxide absorption regeneration system, comprising a regeneration tower 2 and a heat pump system, wherein the heat pump system comprises a condenser 3, an expansion valve 4, an evaporator 5 and a compressor 6 connected in turn in a closed loop,

[0025] 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,

[0026] 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,

[0027] The heat release side of the evaporator 5 is connected by pipeline between 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.

[0028] The specific structure and working principle of the heat pump system are prior art, which will not be described here.

[0029] The amine liquid in the upper section of the regeneration tower 2 flows into the condenser 3 of the heat pump system through the first amine liquid outlet 2-2, absorbs the waste heat of the lean amine liquid collected by the heat pump system, and the rich amine liquid is heated, and after heating, it is regenerated, releases carbon dioxide, and then discharges the lean amine liquid.

[0030] The lean amine liquid discharged from the regeneration tower 2 enters the evaporator 5 of the heat pump system, and transfers heat to the circulating working medium of the heat pump;

[0031] The carbon dioxide absorption regeneration system of the utility model, on the basis of traditional heating regeneration, increases the compression heat pump system, cancels the reboiler to heat by steam, communicates the condenser 3 in the compression heat pump system with the regenerator to heat, circulates through the heat pump system, recovers the heat released by the lean amine liquid (MEDA) cooling, and then transmits the high-quality heat to the amine liquid (MEDA) at the outlet of the upper section of the regeneration tower 2 through the condenser 3 of the heat pump system, so that the regeneration tower 2 does not need any steam consumption, greatly saves the investment of the cold source equipment for the amine liquid (MEDA) cooling and saves energy and reduces carbon.

[0032] The flash tank 7 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.

[0033] The carbon dioxide outlet of the regeneration tower 2 is connected to the diffuser tower 8.

[0034] The gas outlet of the flash tank 7 is connected to the diffuser tower 8.

[0035] The lean liquid circulating pump set 9 is arranged between 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.

[0036] 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 10 and the filter 11 are arranged on the circulation pipeline.

[0037] Working principle:

[0038] 1, rich amine liquid system flow: 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 7, first expands and cools, discharges a small amount of carbon dioxide and water vapor, and then enters the regeneration tower 2.

[0039] 2, lean amine liquid system flow: the lean amine liquid discharged from the regeneration tower 2 enters the evaporator 5 of the heat pump system, transmits heat to the circulating working medium of the heat pump, that is, the lean amine liquid is cooled, and the cooled lean amine liquid is returned to the absorption tower 1 through the amine liquid circulating pump set, so as to absorb and regenerate.

[0040] 3. The blast furnace gas system flow: the blast furnace gas enters the absorption tower 1, and is discharged after being removed of carbon dioxide by the lean amine liquid and being purified.

[0041] The above merely provides the preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, can make equivalent replacement or change within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A zero-vapor-consumption carbon dioxide absorption regeneration system, characterized by: The system comprises a regenerator (2) and a heat pump system, wherein the heat pump system comprises a condenser (3), an expansion valve (4), an evaporator (5) and a compressor (6) connected in sequence in a closed loop, 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 heat release side of the evaporator (5) is connected by a pipeline between the second amine liquid outlet (2-4) of the regenerator (2) and the lean amine liquid inlet (1-2) of the absorber (1).

2. A zero-vapor-consumption carbon dioxide absorption regeneration system according to claim 1, wherein: A flash tank (7) 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).

3. A zero-vapor-consumption carbon dioxide absorption regeneration system according to claim 1, wherein: The carbon dioxide outlet of the regenerator (2) is connected to a vent tower (8).

4. A zero-vapor-consumption carbon dioxide absorption regeneration system according to claim 2, wherein: The gas outlet of the flash tank (7) is connected to the vent tower (8).

5. A zero-vapor-consumption carbon dioxide absorption regeneration system according to claim 1, wherein: A lean liquid circulating pump group (9) 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).

6. A zero-vapor-consumption carbon dioxide absorption regeneration system according to claim 1, wherein: A circulating pipeline is arranged between the bottom of the regenerator (2) and the lower part of the regenerator (2), and a lean liquid filter pump (10) and a filter (11) are arranged on the circulating pipeline.

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