Vacuum spraying device and vacuum spraying amine liquid decarbonization system

Abstract

The utility model discloses a vacuum spraying device and a vacuum spraying amine liquid decarburization system, and belongs to the technical field of energy conservation and environmental protection. The amine liquid decarburization system solves the problem that an existing amine liquid decarburization system adopting heating regeneration is high in energy consumption. Comprising an evaporator and a spray tower, the upper portion of the evaporator is communicated with a rich amine liquid inlet, the lower portion of the evaporator is communicated with a lean amine liquid outlet, a high-temperature water vapor outlet of the evaporator is communicated with a water vapor inlet of the spray tower, and the spray tower is communicated with a cooling water inlet and a cooling water outlet. A sprayer in the spray tower is communicated with the cooling water inlet, and the top of the spray tower is communicated with a low-temperature water vapor outlet. According to the vacuum spraying device disclosed by the utility model, a flash evaporation and spraying process is adopted, so that full-vacuum regeneration can be realized. Moreover, by arranging the spray tower, direct contact type heat exchange is realized, so that the lowest temperature of the discharged carbon dioxide gas can be reduced to 20 DEG C or below, and the energy consumption of the amine liquid decarburization system is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of vacuum spray device and vacuum spray amine liquid decarburization system, belong to energy-saving and environmental protection technical field. BACKGROUND

[0002] The conventional decarburization 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 cooling tower and other means are needed to cool it before entering the absorption tower, so that the lean amine liquid has high absorption capacity in the absorption tower. The conventional heating regeneration technical route needs to consume a large amount of high-quality steam, and the energy consumption is relatively large, and the amine liquid circulation amount is large. SUMMARY

[0003] The utility model discloses to solve the problem of high energy consumption of the existing amine liquid decarburization system using heating regeneration, and further provides a kind of vacuum spray device and vacuum spray amine liquid decarburization system.

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

[0005] A kind of vacuum spray device, including evaporator and spray tower, wherein,

[0006] The upper portion of evaporator is provided with rich amine liquid inlet in communication, and the lower portion of evaporator is provided with lean amine liquid outlet in communication,

[0007] The high-temperature water vapor outlet of evaporator is communicated with the water vapor inlet of spray tower,

[0008] The cooling water inlet and cooling water outlet are provided in communication on the spray tower, and the sprayer in the spray tower is communicated with the cooling water inlet, and the top of the spray tower is provided with low-temperature water vapor outlet in communication.

[0009] Further, the evaporator is single-effect evaporator or multi-effect evaporator, when it is multi-effect evaporator, including first-effect evaporator to N-effect evaporator, wherein N≥2, rich amine liquid inlet is provided in communication on the upper portion of first-effect evaporator, and lean amine liquid outlet is provided in communication on the bottom of N-effect evaporator, each adjacent two-effect evaporator is communicated by flash liquid channel, and the high-temperature water vapor outlet of each-effect evaporator is connected with a corresponding spray tower, or the high-temperature water vapor outlet of multi-effect evaporator is communicated with a spray tower.

[0010] Further, the spray tower is a single-stage spray tower or a multi-stage spray tower, when it is a multi-stage spray tower, it comprises a first-stage spray tower to an N-stage spray tower, wherein N≥2, the water vapor inlet is connected to the first-stage spray tower, each stage of the spray tower is provided with a sprayer, and each stage of the spray tower is provided with a cooling water inlet and a cooling water outlet, and a steam passage is connected between each two adjacent stages of the spray tower.

[0011] Further, when the multi-stage spray tower is used, the temperature of the cooling water entering the second-stage to the N-stage spray tower is lower than the temperature of the cooling water entering the first-stage spray tower.

[0012] Further, the temperature of the cooling water entering the first-stage spray tower ranges from 30 to 50°C, and the temperature of the cooling water entering the second-stage to the N-stage spray tower ranges from 8 to 15°C.

[0013] A vacuum spray amine liquid decarburization system comprises the above-mentioned vacuum spray device, and further comprises an absorption tower and a flash tank, wherein the flash tank is connected between the rich amine liquid outlet of the absorption tower and the rich amine liquid inlet of the evaporator, and the lean amine liquid outlet of the evaporator is connected to the lean amine liquid inlet of the absorption tower.

[0014] Further, the low-temperature water vapor outlet of the spray tower and the gas outlet of the flash tank are respectively connected to a dispersion tower.

[0015] Further, the flash pressure of the flash tank ranges from 30 to 50 kPa.a, and the flash pressure of the evaporator ranges from 1.7 to 4.2 kPa.a.

[0016] Further, a circulation pipeline is connected between the bottom of the evaporator and the lower part of the evaporator, and a lean liquid filtration pump and a filter are arranged on the circulation pipeline.

[0017] Further, a lean liquid circulation pump group is arranged between the lean amine liquid outlet of the evaporator and the lean amine liquid inlet of the absorption tower.

[0018] Working principle:

[0019] 1. Rich amine liquid system process: The lean amine liquid with a relatively low temperature absorbs the carbon dioxide in the raw blast furnace gas in the absorption tower, purifies the raw blast furnace gas, forms rich amine liquid, enters the flash tank, performs the first expansion and cooling, discharges a small amount of carbon dioxide and water vapor, and then enters the evaporator, releases carbon dioxide by using the flash cooling effect of the evaporator, and discharges lean amine liquid.

[0020] 2. Lean amine liquid system process: The lean amine liquid discharged from the evaporator is pumped back to the absorption tower by the lean liquid circulation pump group.

[0021] 2. Steam process: High-temperature steam enters the spray tower, is cooled by spraying, and is discharged to the dispersion tower.

[0022] 3. Blast furnace gas system flow: blast furnace gas enters the absorption tower, and is discharged after carbon dioxide removal and purification by lean amine liquid.

[0023] Compared with the prior art, the utility model has the following effects:

[0024] The vacuum spraying device adopts the process of flashing + spraying, and can realize full-vacuum regeneration. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 It is a structure schematic view of the vacuum spraying device of the utility model;

[0026] Fig. 2 It is a structure schematic view of the vacuum spraying amine liquid decarburization system of the utility model.

[0027] In the drawings:

[0028] 1, evaporator; 1-1, rich amine liquid inlet; 1-2, lean amine liquid outlet; 1-3, high-temperature water vapor outlet; 2, spraying tower; 2-1, sprayer; 2-2, cooling water inlet; 2-3, cooling water outlet; 2-4, low-temperature water vapor outlet; 2-5, steam passage; 3, absorption tower; 4, flashing tank; 5, diffuser tower; 6, lean liquid filtration pump; 7, filter; 8, lean liquid circulating pump set. DETAILED DESCRIPTION

[0029] Specific implementation mode one: combined with Figs. 1-2 It is obvious that the described implementation mode is only a part of the implementation mode of the utility model, rather than all the implementation modes, and all other implementation modes obtained by the person skilled in the art without creative labor based on the implementation mode of the utility model belong to the protection range of the utility model.

[0030] It should be noted that the description of the utility model about "front", "back", "left", "right", "inside", "outside", "left side", "right side", "upper part", "lower part", "top", "bottom" and the like is defined based on the position or relationship of the drawings shown, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the structure must be constructed and operated in a specific direction, therefore, it cannot be understood as a limitation on the utility model. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] In the description of the utility model, unless another definite and limited, the term '' install '' '' link '' '' connect '' should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be direct connection, also can be indirectly connected through the intermediate medium, can be two element internal communication. For ordinary skilled in the art, the above-mentioned term can be understood in the utility model with concrete meaning of concrete situation.

[0032] A vacuum spray device, comprising an evaporator 1 and a spray tower 2, wherein,

[0033] The upper portion of the evaporator 1 is provided with a rich amine liquid inlet 1-1, and the lower portion of the evaporator 1 is provided with a lean amine liquid outlet 1-2,

[0034] The high-temperature water vapor outlet 1-3 of the evaporator 1 is communicated with the water vapor inlet of the spray tower 2,

[0035] The spray tower 2 is provided with a cooling water inlet 2-2 and a cooling water outlet 2-3, and the sprayer 2-1 in the spray tower 2 is communicated with the cooling water inlet 2-2, and the top of the spray tower 2 is provided with a low-temperature water vapor outlet 2-4.

[0036] The evaporator 1 in the application can be a single-effect evaporator or a multi-effect evaporator, and the spray tower 2 can be a single-stage spray tower or a multi-stage spray tower. When the evaporator 1 is a multi-effect evaporator, the number of effects is greater than or equal to 2. When the spray tower 2 is a multi-stage spray tower, the number of stages is greater than or equal to 2.

[0037] The rich amine liquid enters the evaporator 1 through the rich amine liquid inlet 1-1, and after vacuum flashing in the evaporator 1, the water vapor generated by the rich amine liquid is introduced into the spray tower 2 through the pipeline, and is discharged after being cooled by the cooling water.

[0038] The vacuum spray device of the utility model adopts the process of flashing + spraying, and can realize full-vacuum regeneration. Moreover, by arranging the spray tower 2, direct contact heat exchange is realized, so that the minimum temperature of the discharged carbon dioxide gas can be reduced to below 20 DEG C, and the energy consumption of the amine liquid decarburization system is greatly reduced.

[0039] The low-temperature water vapor outlet 2-4 of the spray tower 2 discharges low-temperature water vapor and a small amount of carbon dioxide gas after decarburization treatment.

[0040] The low-temperature and high-temperature in the utility model are relative concepts, and the water vapor discharged after flashing of the evaporator 1 is discharged after being sprayed and cooled by the spray tower 2.

[0041] The low-temperature water vapor outlet 2-4 is connected with an exhaust pump.

[0042] The evaporator 1 is a single-effect evaporator or a multi-effect evaporator, when it is a multi-effect evaporator, including a first-effect evaporator to an Nth-effect evaporator, wherein N≥2, the rich amine liquid inlet 1-1 is arranged in communication at the upper portion of the first-effect evaporator, the lean amine liquid outlet 1-2 is arranged in communication at the bottom of the Nth-effect evaporator, the flash liquid channel is arranged in communication between every two adjacent-effect evaporators, and the high-temperature water vapor outlet 1-3 of each-effect evaporator is correspondingly connected with a spray tower 2, or the high-temperature water vapor outlet 1-3 of the multi-effect evaporator is in communication with a spray tower 2. By way of example, two-effect evaporators are taken as an example, the high-temperature water vapor outlet 1-3 of each-effect evaporator is correspondingly connected with a spray tower 2, that is, the number of spray towers 2 is two, the high-temperature water vapor outlet 1-3 of the first-effect evaporator is in communication with the water vapor inlet of one spray tower 2, and the high-temperature water vapor outlet 1-3 of the second-effect evaporator is in communication with the water vapor inlet of the other spray tower 2; the high-temperature water vapor outlet 1-3 of the multi-effect evaporator is in communication with one spray tower 2, that is, the number of spray towers 2 is one, and the high-temperature water vapor outlet 1-3 of the first-effect evaporator and the high-temperature water vapor outlet 1-3 of the second-effect evaporator are both in communication with the same spray tower 2.

[0043] The spray tower 2 is a single-stage spray tower or a multi-stage spray tower, when it is a multi-stage spray tower, including a first-stage spray tower to an Nth-stage spray tower, wherein N≥2, the water vapor inlet is arranged in communication at the first-stage spray tower, the sprayer 2-1 is arranged in each-stage spray tower, and the cooling water inlet 2-2 and the cooling water outlet 2-3 are arranged on each-stage spray tower, and the steam channel 2-5 is arranged in communication between every two adjacent-stage spray towers. By way of example, when the spray tower 2 is a multi-stage spray tower, the first-stage spray tower to the Nth-stage spray tower are arranged in communication from bottom to top through the steam channel 2-5. By way of example, two-stage spray towers are taken as an example, the high-temperature water vapor first enters the first-stage spray tower, is sprayed and cooled by the sprayer 2-1 in the first-stage spray tower, then enters the second-stage spray tower through the steam channel 2-5 to continue to be sprayed and cooled, and is then discharged.

[0044] When the multi-stage spray tower is adopted, the temperature of the cooling water entering the second to Nth-stage spray towers is lower than the temperature of the cooling water entering the first-stage spray tower. By way of example, the temperature of the cooling water of the first to Nth-stage spray towers can be gradually reduced, or the temperature of the cooling water of the second to Nth-stage spray towers is the same, but lower than the temperature of the cooling water of the first-stage spray tower, so that the use amount of low-temperature cooling water can be greatly reduced.

[0045] The temperature of the cooling water entering the first-stage spray tower ranges from 30 to 50℃, and the temperature of the cooling water entering the second to Nth-stage spray towers ranges from 8 to 15℃.

[0046] The vacuum spray amine liquid decarburization system comprises the vacuum spray device, and further comprises an absorption tower 3 and a flash tank 4, wherein the flash tank 4 is connected between the rich amine liquid outlet of the absorption tower 3 and the rich amine liquid inlet 1-1 of the evaporator 1, and the lean amine liquid outlet 1-2 of the evaporator 1 is connected to the lean amine liquid inlet of the absorption tower 3. The raw blast furnace gas enters from the lower part of the absorption tower 3, is purified by the lean amine liquid, and is discharged.

[0047] The lean amine liquid enters the absorption tower 3 through the lean amine liquid inlet, absorbs the carbon dioxide in the raw blast furnace gas, and is discharged from the absorption tower 3 through the rich amine liquid outlet.

[0048] The amine liquid is regenerated in full vacuum through the vacuum spray device, and direct contact heat exchange is realized through the setting of the spray tower 2, so that the minimum temperature of the discharged carbon dioxide gas can be reduced to below 20℃, and the energy consumption of the amine liquid decarburization system is greatly reduced.

[0049] The carbon dioxide solubility characteristics of the amine liquid are utilized, in the low-temperature and low-pressure working condition interval, the amine liquid environment pressure rapidly decreases, the carbon dioxide solubility rapidly decreases, at this time, high vacuum is applied to realize further large decarburization, and due to the heat absorption principle of liquid evaporation, the amine liquid temperature is further reduced in the process of vacuum decarburization, and the energy consumption is effectively reduced.

[0050] The flash tank 4 is provided, the first expansion and cooling are carried out before the vacuum spray device, and a small amount of carbon dioxide and water vapor is discharged.

[0051] The low-temperature water vapor outlet 2-4 of the spray tower 2 and the gas outlet of the flash tank 4 are respectively connected to a diffuser tower 5. In this way, the gas released from the vacuum spray device is discharged and treated through the diffuser tower 5. The gas outlet of the flash tank 4 is located at the top of the flash tank 4, which is used to discharge the flash steam and carbon dioxide gas, and the diffuser tower 5 is provided to discharge and treat the carbon dioxide gas released from the flash tank 4.

[0052] The flash pressure range of the flash tank 4 is 30-50kpa.a, and the flash pressure range of the evaporator 1 is 1.7-4.2kPa.a.

[0053] A circulating pipeline is connected between the bottom of the evaporator 1 and the lower part of the evaporator 1, and a lean liquid filtering pump 6 and a filter 7 are arranged on the circulating pipeline.

[0054] A lean liquid circulating pump group 8 is arranged between the lean amine liquid outlet 1-2 of the evaporator 1 and the lean amine liquid inlet of the absorption tower 3. In this way, the lean amine liquid after flash cooling can be punched back to the absorption tower 3 through the lean liquid circulating pump group 8.

[0055] Working principle:

[0056] 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 3, purifies the raw blast furnace gas to form the rich amine liquid, enters the flash tank 4, first expands and cools, discharges a small amount of carbon dioxide and water vapor, then enters the evaporator 1, releases the carbon dioxide by the flash cooling of the evaporator 1, and discharges the lean amine liquid.

[0057] 2. The lean amine liquid system process: the lean amine liquid discharged from the evaporator 1 is pumped back to the absorption tower 3 by the lean liquid circulating pump set 8.

[0058] 2. The steam process: the high temperature steam enters the spray tower 2, is cooled by spraying, and is discharged to the diffuser tower 5.

[0059] 3. The blast furnace gas system process: the blast furnace gas enters the absorption tower 3, is purified by removing the carbon dioxide by the lean amine liquid, and is discharged.

[0060] The above is only the preferred specific implementation 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 vacuum spray device, characterized by: The vacuum spraying device comprises an evaporator (1) and a spray tower (2), wherein, The upper part of the evaporator (1) is provided with an amine-rich liquid inlet (1-1), and the lower part of the evaporator (1) is provided with an amine-lean liquid outlet (1-2), The high-temperature water vapor outlet (1-3) of the evaporator (1) is communicated with the water vapor inlet of the spray tower (2), The spray tower (2) is provided with a cooling water inlet (2-2) and a cooling water outlet (2-3) on the upper part, and the sprayer (2-1) in the spray tower (2) is communicated with the cooling water inlet (2-2), and the top of the spray tower (2) is provided with a low-temperature water vapor outlet (2-4).

2. A vacuum shower according to claim 1, wherein: The evaporator (1) is a single-effect evaporator or a multi-effect evaporator, when it is a multi-effect evaporator, it comprises a first-effect evaporator to an Nth-effect evaporator, wherein N≥2, the amine-rich liquid inlet (1-1) is communicated and arranged on the upper part of the first-effect evaporator, the amine-lean liquid outlet (1-2) is communicated and arranged on the bottom of the Nth-effect evaporator, the flash liquid channel is communicated between every two adjacent effect evaporators, and the high-temperature water vapor outlet (1-3) of each effect evaporator is correspondingly connected with a spray tower (2), or the high-temperature water vapor outlet (1-3) of the multi-effect evaporator is communicated with a spray tower (2).

3. A vacuum shower according to claim 1, wherein: The spray tower (2) is a single-stage spray tower or a multi-stage spray tower, when it is a multi-stage spray tower, it comprises a first-stage spray tower to an Nth-stage spray tower, wherein N≥2, the water vapor inlet is communicated and arranged on the first-stage spray tower, the sprayer (2-1) is arranged in each stage spray tower, and the cooling water inlet (2-2) and the cooling water outlet (2-3) are arranged on each stage spray tower, and the steam channel (2-5) is communicated between every two adjacent stage spray towers.

4. A vacuum shower according to claim 3, wherein: When the multi-stage spray tower is adopted, the temperature of the cooling water entering the second to Nth-stage spray towers is lower than that of the cooling water entering the first-stage spray tower.

5. A vacuum shower according to claim 4, wherein: The temperature of the cooling water entering the first-stage spray tower ranges from 30 to 50℃, and the temperature of the cooling water entering the second to Nth-stage spray towers ranges from 8 to 15℃.

6. A vacuum spray amine liquor decarburization system characterized by: The vacuum spraying device comprises the evaporator (1) and the spray tower (2), wherein the evaporator (1) is a single-effect evaporator or a multi-effect evaporator, when it is a multi-effect evaporator, it comprises a first-effect evaporator to an Nth-effect evaporator, wherein N≥2, the amine-rich liquid inlet (1-1) is communicated and arranged on the upper part of the first-effect evaporator, the amine-lean liquid outlet (1-2) is communicated and arranged on the bottom of the Nth-effect evaporator, the flash liquid channel is communicated between every two adjacent effect evaporators, and the high-temperature water vapor outlet (1-3) of each effect evaporator is correspondingly connected with a spray tower (2), or the high-temperature water vapor outlet (1-3) of the multi-effect evaporator is communicated with a spray tower (2).

7. The vacuum spray amine solution decarburization system of claim 6, wherein: The low-temperature water vapor outlet (2-4) of the spray tower (2) and the gas outlet of the flash tank (4) are respectively connected to a diffuser tower (5).

8. The vacuum spray amine solution decarburization system of claim 6, wherein: The flash pressure of the flash tank (4) ranges from 30 to 50kPa·a, and the vacuum degree of the evaporator (1) ranges from 1.7 to 4.2kPa·a.

9. The vacuum spray amine solution decarburization system of claim 6, wherein: The bottom of the evaporator (1) is connected with the lower part of the evaporator (1), and the circulating pipeline is arranged therebetween, and the circulating pipeline is provided with a lean liquid filtering pump (6) and a filter (7).

10. The vacuum spray amine solution decarburization system of claim 6, wherein: The lean liquid circulating pump group (8) is arranged between the amine-lean liquid outlet (1-2) of the evaporator (1) and the amine-lean liquid inlet of the absorption tower (3).

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