CN202729810U

CN202729810U - High purity liquid carbon dioxide purification apparatus

Info

Publication number: CN202729810U
Application number: CN2012204041844U
Authority: CN
Inventors: 沈建冲; 徐美南
Original assignee: HANGZHOU KUAIKAI HIGH-EFFICIENCY ENERGY-SAVING NEW TECHN Co Ltd
Current assignee: HANGZHOU KUAIKAI HIGH-EFFICIENCY ENERGY-SAVING NEW TECHN Co Ltd
Priority date: 2012-08-14
Filing date: 2012-08-14
Publication date: 2013-02-13
Anticipated expiration: 2022-08-14

Abstract

The utility model discloses a high purity liquid carbon dioxide purification apparatus, including a precooler (1), a liquefaction rectification column (2), a reflux tank (3). A first top air outlet (11) of the precooler (1) is communicated with a second central air inlet (23) of the liquefaction rectification column (2). A first upper air outlet of the precooler (1) is communicated with a second lower air inlet (24) of the liquefaction rectification column (2). A first lower liquid inlet (14) of the precooler (1) is communicated with a second bottom liquid outlet (25) of the liquefaction rectification column (2). A second upper liquid inlet (26) of the liquefaction rectification column (2) is communicated with a third bottom liquid outlet (33) of the reflux tank (3). A second upper liquid outlet (27) of the liquefaction rectification column (2) is communicated with a third upper liquid inlet (32) of the reflux tank (3). The apparatus is suitable for the occasion of the production of food-grade high-purity liquid carbon dioxide, and has the advantages of high purity product carbon dioxide, stable and reliable quality, and energy-saving and cost-reducing equipment.

Description

The high purity liquid carbon dioxide purifying device

Technical field

The utility model relates to a kind of preparation facilities of high purity Liquid carbon dioxide, and the purifying plant of high purity liquid carbonic acid gas especially is applicable to the occasion of the high purity Liquid carbon dioxides such as production food grade.

Background technology

At present, the method for purification of industrial carbonic acid gas mainly contains: solvent absorption, pressure swing adsorption process, membrane separation process, compression condensation method etc., these methods respectively have relative merits in concrete the use.For example, solvent absorption mainly is to select one or more absorption liquids according to gas source condition, absorb the carbonic acid gas in the source of the gas, then from absorption liquid, resolve carbonic acid gas, be applicable to process the lower source of the gas of carbon dioxide in gas concentration, separating effect is better, but this technology investment expense is large, energy consumption is high, and the Separation and Recovery cost is high.The compression condensation method also is industrial carbonic acid gas method of purification commonly used, the method is forced into CO 2 raw material gas more than the 2MPa, then purify, desulfurizing and drying, with refrigeration agent pressurized gas is cooled to again and makes it liquefaction about-25 ℃, carry out rectification and purification, this method can be removed the N that exists in the unstripped gas effectively again ₂, CO, H ₂, CH ₄, O ₂Deng light constituent impurity, also can obtain highly purified liquid carbon dioxide, but the method can't be removed the restructuring minute impurity such as the alcohol that exists in the unstripped gas, ketone, aldehyde, aromatic hydrocarbon.

The utility model content

The utility model is for the deficiencies in the prior art, provide a kind of reliable and stable, product purity is high, energy-saving and cost-reducing high purity liquid carbon dioxide purifying device.

For realizing above goal of the invention, the utility model by the following technical solutions:

The high purity liquid carbon dioxide purifying device comprises pre-cooler 1, liquefying and rectifying tower 2, return tank 3; Pre-cooler 1 comprises air outlet, the first top 11, the first discharge outlet 12, the first bottom air inlet 13, the first bottom fluid inlet 14, air outlet, the first top 15; Liquefying and rectifying tower 2 comprises refrigerant outlet 21, refrigerant inlet 22, the second middle part inlet mouth 23, the second bottom inlet mouth 24, the second bottom liquid outlet 25, the second top fluid inlet 26, the second top liquid outlet 27; Return tank 3 comprises the 3rd drain 31, the 3rd top fluid inlet 32, the 3rd bottom liquid outlet 33; The air outlet, the first top 11 of pre-cooler 1 is communicated with the second middle part inlet mouth 23 of liquefying and rectifying tower 2, the air outlet, the first top 15 of pre-cooler 1 is communicated with the second bottom inlet mouth 24 of liquefying and rectifying tower 2, and the first bottom fluid inlet 14 of pre-cooler 1 is communicated with the second bottom liquid outlet 25 of liquefying and rectifying tower 2; The second top fluid inlet 26 of liquefying and rectifying tower 2 is communicated with the 3rd bottom liquid outlet 33 of return tank 3, and the second top liquid outlet 27 of liquefying and rectifying tower 2 is communicated with the 3rd top fluid inlet 32 of return tank 3.

As one of technique scheme example preferably, the second top liquid outlet 27 on the described liquefying and rectifying tower 2, the second top fluid inlet 26, the second middle part inlet mouth 23, the second bottom inlet mouth 24 are arranged in order from top to bottom.

Another example preferably as technique scheme, described the first discharge outlet 12 is positioned at the bottom of pre-cooler 1, described the 3rd drain 31 is positioned at the top of return tank 3, and the refrigerant outlet 21 at described liquefying and rectifying tower 2 tops is positioned at the top of refrigerant inlet 22.

The beneficial effects of the utility model are, Liquid carbon dioxide in the liquefying and rectifying tower 2 and atmospheric carbon dioxide is reverse will touch, divide impurity liquefaction to separate the restructuring in the carbon dioxide behind the mass-and heat-transfer, and discharge from the bottom of liquefying and rectifying tower 2 with Liquid carbon dioxide; Drain is set on the return tank 3 can removes the N that is difficult for being liquefied ₂, CO, H ₂, CH ₄Deng light constituent impurity; Discharge outlet on the pre-cooler 1 can be removed the restructuring minute impurity such as alcohol, ketone, aldehyde, aromatic hydrocarbon; In addition, emptying carbonic acid gas out can be for other operations such as desiccant regeneration of unstripped gas dehumidifying, moisture eliminator in pre-cooler 1, the return tank 3.When using this device preparation high purity Liquid carbon dioxide, install reliable and stablely, carbon dioxide product purity is high, and energy saving of system lowers consumption.

Description of drawings

Accompanying drawing 1 is high purity liquid carbon dioxide purifying device structural representation.

Embodiment

In the embodiment shown in the figures, the high purity liquid carbon dioxide purifying device comprises pre-cooler 1, liquefying and rectifying tower 2, return tank 3; Pre-cooler 1 comprises air outlet, the first top 11, the first discharge outlet 12, the first bottom air inlet 13, the first bottom fluid inlet 14, air outlet, the first top 15, wherein the first discharge outlet 12 is positioned at the bottom of pre-cooler 1, is beneficial to contain the discharge that the restructuring such as alcohol, ketone, aldehyde, aromatic hydrocarbon divide the Liquid carbon dioxide of impurity; Liquefying and rectifying tower 2 comprises refrigerant outlet 21, refrigerant inlet 22, the second middle part inlet mouth 23, the second bottom inlet mouth 24, the second bottom liquid outlet 25, the second top fluid inlet 26, the second top liquid outlet 27, the second top liquid outlet 27, the second top fluid inlet 26, the second middle part inlet mouth 23, the second bottom inlet mouth 24 are arranged in order on liquefying and rectifying tower 2 from top to bottom, and the refrigerant outlet 21 at liquefying and rectifying tower 2 tops is positioned at the top of refrigerant inlet 22; Return tank 3 comprises the top that the 3rd drain 31, the 3rd top fluid inlet 32, the 3rd bottom liquid outlet 33, the three drains 31 are positioned at return tank 3; The air outlet, the first top 11 of pre-cooler 1 is communicated with the second middle part inlet mouth 23 of liquefying and rectifying tower 2, the air outlet, the first top 15 of pre-cooler 1 is communicated with the second bottom inlet mouth 24 of liquefying and rectifying tower 2, and the first bottom fluid inlet 14 of pre-cooler 1 is communicated with the second bottom liquid outlet 25 of liquefying and rectifying tower 2; The second top fluid inlet 26 of liquefying and rectifying tower 2 is communicated with the 3rd bottom liquid outlet 33 of return tank 3, and the second top liquid outlet 27 of liquefying and rectifying tower 2 is communicated with the 3rd top fluid inlet 32 of return tank 3.

CO 2 raw material gas after pretreatment enters pre-cooler 1 by the first bottom air inlet 13 of pre-cooler 1, is entered in the liquefying and rectifying tower 2 by air outlet, the first top 11, the second middle part inlet mouth 23 after pre-cooler 1 cooling; In the gaseous carbon dioxide that in liquefying and rectifying tower 2, is entered by pre-cooler 1 and the return tank 3 through the 3rd bottom liquid outlet 33, the second top fluid inlet 26 passes back into the reverse contact of liquid carbon dioxide in the liquefying and rectifying tower 2, mass-and heat-transfer, remove the alcohol in the gaseous carbon dioxide, ketone, aldehyde, the restructuring such as aromatic hydrocarbon minute impurity, isolated restructuring divides impurity and liquid carbon dioxide to be mixed into the bottom of liquefying and rectifying tower 2, and from the second bottom liquid outlet 25, the first bottom fluid inlet 14 enters in the pre-cooler 1, with the CO 2 raw material gas heat exchange and the precooling CO 2 raw material gas that are entered pre-cooler 1 by the first bottom air inlet 13, gaseous carbon dioxide behind the precooling CO 2 raw material gas is through air outlet, the first top 15, the second bottom inlet mouth 24 reenters the bottom of liquefying and rectifying tower 2, and flows from lower to upper in liquefying and rectifying tower 2; Liquid carbon dioxide behind the precooling CO 2 raw material gas and restructuring minute impurity are discharged by the first discharge outlet 12, enter subsequent handling and process.

Top at liquefying and rectifying tower 2 is provided with condenser, and refrigerant outlet 21 is positioned at the top of refrigerant inlet 22.Gaseous carbon dioxide behind the separating heavy impurity flows from lower to upper, is incorporated into the top of the evaporator overhead condenser in the liquefying and rectifying tower 2 by the top air entraining pipe, and flows from top to bottom in condenser, forms countercurrent flow with refrigeration agent.The liquid carbon dioxide that becomes through condenser condenses is entered in the return tank 3 by the second top liquid outlet 27, the 3rd top fluid inlet 32, together flows into the light constituent impurity that is not liquefied in the return tank 3 with liquid carbon dioxide, such as N ₂, CO, H ₂, CH ₄Deng by 31 emptying of the 3rd drain.A part of liquid carbon dioxide behind the emptying light constituent impurity enters in the liquefying and rectifying tower 2 through the 3rd bottom liquid outlet 33, the second top fluid inlet 26, and another part enters follow-up processing unit through the 3rd bottom liquid outlet 33.

Use this device can effectively remove the restructuring minute impurity such as the very difficult alcohol of removing, ketone, aldehyde, aromatic hydrocarbon in the traditional technology, guarantee the high-pureness carbon dioxide steady quality produced, and had the advantages such as easy to operate, that energy consumption is low, recovery rate of CO 2 is high, facility investment is few.

Claims

1. the high purity liquid carbon dioxide purifying device comprises pre-cooler (1), liquefying and rectifying tower (2), return tank (3); Pre-cooler (1) comprises air outlet, the first top (11), the first discharge outlet (12), the first bottom air inlet (13), the first bottom fluid inlet (14), air outlet, the first top (15); Liquefying and rectifying tower (2) comprises refrigerant outlet (21), refrigerant inlet (22), the second middle part inlet mouth (23), the second bottom inlet mouth (24), the second bottom liquid outlet (25), the second top fluid inlet (26), the second top liquid outlet (27); Return tank (3) comprises the 3rd drain (31), the 3rd top fluid inlet (32), the 3rd bottom liquid outlet (33); The air outlet, the first top (11) that it is characterized in that pre-cooler (1) is communicated with the second middle part inlet mouth (23) of liquefying and rectifying tower (2), the air outlet, the first top (15) of pre-cooler (1) is communicated with the second bottom inlet mouth (24) of liquefying and rectifying tower (2), and the first bottom fluid inlet (14) of pre-cooler (1) is communicated with the second bottom liquid outlet (25) of liquefying and rectifying tower (2); The second top fluid inlet (26) of liquefying and rectifying tower (2) is communicated with the 3rd bottom liquid outlet (33) of return tank (3), and the second top liquid outlet (27) of liquefying and rectifying tower (2) is communicated with the 3rd top fluid inlet (32) of return tank (3).

2. high purity liquid carbon dioxide purifying device according to claim 1 is characterized in that the second top liquid outlet (27), the second top fluid inlet (26), the second middle part inlet mouth (23), the second bottom inlet mouth (24) on the described liquefying and rectifying tower (2) is arranged in order from top to bottom.

3. high purity liquid carbon dioxide purifying device according to claim 1, it is characterized in that described the first discharge outlet (12) is positioned at the bottom of pre-cooler (1), described the 3rd drain (31) is positioned at the top of return tank (3), and the refrigerant outlet (21) at described liquefying and rectifying tower (2) top is positioned at the top of refrigerant inlet (22).