Rectification device for industrial carbon dioxide production

Abstract

The utility model discloses a rectifying device for industrial carbon dioxide production, which is characterized in that a plurality of sieve tray plates are arranged in a rectifying tower at equal intervals, sufficient space is provided for gas-liquid mass transfer, the sieve structure is beneficial to uniform distribution and mixing of gas and liquid, the mass transfer effect is enhanced, and carbon dioxide and impurities can be efficiently separated. The reboiler naturally circulates according to the thermosyphon principle, additional pumps are not needed, equipment investment and energy consumption are reduced, the heating power can be accurately adjusted through a heating medium conveying and discharging pipe, and the temperature and pressure in the tower are kept stable. And the condenser is tubular, so that the heat transfer area is large, and the cooling efficiency is high. In the aspects of feeding, discharging and control, the feeding pipe is provided with a flow regulating valve, the tail end of the condensation outlet pipe is provided with a pressure regulating valve, and the reflux pipe is provided with a reflux regulating valve, so that the feeding flow, the tower top pressure and the reflux flow can be respectively regulated, the material balance is favorably maintained, the tower pressure is stabilized, and the reflux ratio is optimized, thereby improving the rectification efficiency and the product purity and reducing the energy consumption.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial carbon dioxide production technical field, specifically, relate to a rectifying device for industrial carbon dioxide production. BACKGROUND

[0002] In industrial production, carbon dioxide is an important chemical raw material and industrial gas, widely used in food, chemical industry, electronics and many other fields. The production of industrial carbon dioxide usually needs to purify the raw gas to meet the required purity. Rectification is a common purification method, through rectification, carbon dioxide can be separated from other impurities, so as to obtain high-purity carbon dioxide product.

[0003] The deficiency of the prior art is that the tray structure in the rectifying tower is unreasonable, which leads to low gas-liquid mass transfer efficiency and affects the rectification effect; the reboiler and the condenser are not optimized in design, resulting in large energy consumption; the control of feeding and discharging is not accurate enough, which is difficult to ensure the quality and stability of the product. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a rectifying device for industrial carbon dioxide production to solve the problems in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a rectifying device for industrial carbon dioxide production, comprising a rectifying tower, a plurality of trays are installed equidistantly inside the rectifying tower, a feeding pipe is installed in the middle of the side surface of the rectifying tower, a reboiling inlet pipe is installed at the bottom of the side surface of the rectifying tower, the reboiling inlet pipe is connected with the bottom of the side surface of a reboiler, a reboiling outlet pipe is installed at the top of the reboiler and communicates with the middle of the side surface of the rectifying tower, a condenser is installed at the top of the rectifying tower, a condensing inlet pipe is installed between the middle of the side surface of the condenser and the top end of the rectifying tower, a condensing outlet pipe is installed at the bottom end of the condenser, and a discharging pipe is installed at the bottom of the rectifying tower.

[0006] As a preferred technical scheme of the utility model, the tray is a sieve tray, and a plurality of sieve holes are uniformly distributed on the sieve tray.

[0007] As a preferred technical scheme of the utility model, the reboiler is a horizontal heat siphon reboiler, a heating medium inlet pipe is connected with the heating medium inlet of the reboiler, and a heating medium outlet pipe is connected with the heating medium outlet of the reboiler.

[0008] As a preferred technical scheme of the utility model, the condenser is a shell-and-tube condenser, a cooling medium inlet pipe is connected with the cooling medium inlet of the condenser, and a cooling medium outlet pipe is connected with the cooling medium outlet of the condenser.

[0009] As the preferred technical scheme of the present application, the flow regulating valve is arranged on the feed pipe to regulate the flow of raw material into the rectifying tower.

[0010] As the preferred technical scheme of the present application, the pressure regulating valve is arranged on the end of the condensing pipe to regulate the pressure at the top of the tower.

[0011] As the preferred technical scheme of the present application, the reflux pipe is connected to the middle part of the condensing pipe and the end of the reflux pipe is connected to the top of the rectifying tower to return part of the condensed liquid into the rectifying tower, and the reflux regulating valve is arranged on the reflux pipe to regulate the flow of the reflux liquid.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] The present application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0015] Figure 1 is a structure schematic view of the rectifying device as a whole for industrial carbon dioxide production according to an embodiment of the present application;

[0016] Figure 2 is a structure schematic view of the rectifying tower inside the rectifying device for industrial carbon dioxide production according to an embodiment of the present application;

[0017] Figure 3is a structure schematic view of a reboiler pipeline of a rectification device for industrial carbon dioxide production according to the embodiment of the utility model

[0018] Figure 4 is a structure schematic view of a condensing-out pipeline and a reflux pipeline of a rectification device for industrial carbon dioxide production according to the embodiment of the utility model

[0019] Reference Signs:

[0020] 1, rectification tower; 2, tray; 3, feed pipe; 4, reboiling inlet pipe; 5, reboiler; 6, reboiling outlet pipe; 7, condenser; 8, condensing inlet pipe; 9, condensing outlet pipe; 10, discharge pipe; 11, sieve hole; 12, heating medium delivery pipe; 13, heating medium discharge pipe; 14, cooling medium delivery pipe; 15, cooling medium discharge pipe; 16, flow regulating valve; 17, pressure regulating valve; 18, reflux pipeline; 19, reflux regulating valve. DETAILED DESCRIPTION

[0021] In the following, the utility model is further described in combination with the drawings and the specific embodiment:

[0022] Please refer to Figures 1-4 According to the embodiment of the utility model, the rectification device for industrial carbon dioxide production comprises a rectification tower 1, a plurality of trays 2 are installed equidistantly inside the rectification tower 1, a feed pipe 3 is installed at the middle part of the side of the rectification tower 1, a reboiling inlet pipe 4 is installed at the bottom of the side of the rectification tower 1, the reboiling inlet pipe 4 is connected to the bottom of the side of a reboiler 5, the reboiler 5 is installed with a reboiling outlet pipe 6 at the top and is communicated with the middle part of the side of the rectification tower 1, a condenser 7 is installed at the top of the rectification tower 1, a condensing inlet pipe 8 is installed between the middle part of the side of the condenser 7 and the top end of the rectification tower 1, a condensing outlet pipe 9 is installed at the bottom end of the condenser 7, and a discharge pipe 10 is installed at the bottom of the rectification tower 1.

[0023] The trays 2 are uniformly distributed with sieve holes 11 thereon, so that the gas and liquid can be fully contacted and mixed, and the mass transfer effect is enhanced. The feed pipe 3 is used for conveying raw materials to the rectification tower 1. The reboiling inlet pipe 4 conveys the liquid at the bottom of the rectification tower 1 to the reboiler 5 for heating. The reboiler 5 accurately controls the heating power through the heating medium delivery pipe 12 and the heating medium discharge pipe 13, so that the liquid is vaporized and returned to the rectification tower 1 through the reboiling outlet pipe 6. The condenser 7 cools the steam at the top of the rectification tower 1 into liquid, and the cooling medium circulates through the cooling medium delivery pipe 14 and the cooling medium discharge pipe 15. The condensing inlet pipe 8 conveys the steam at the top of the rectification tower 1 to the condenser 7. The condensing outlet pipe 9 discharges the condensed liquid in the condenser 7. The discharge pipe 10 discharges the product at the bottom of the rectification tower 1.

[0024] In the embodiment, the trays 2 are sieve hole trays 2 and are uniformly distributed with a plurality of sieve holes 11 thereon.

[0025] In this embodiment, the reboiler 5 is a horizontal thermosyphon reboiler 5, and the heating medium inlet of the reboiler 5 is connected with a heating medium conveying pipe 12, and the heating medium outlet is connected with a heating medium discharging pipe 13.

[0026] The heating medium conveying pipe 12 conveys the heating medium to the reboiler 5, and the heating medium discharging pipe 13 discharges the heating medium in the reboiler 5.

[0027] In this embodiment, the condenser 7 is a shell-and-tube condenser 7, and the cooling medium inlet of the condenser 7 is connected with a cooling medium conveying pipe 14, and the cooling medium outlet is connected with a cooling medium discharging pipe 15.

[0028] In this embodiment, the feed pipe 3 is provided with a flow regulating valve 16 for regulating the flow of raw materials into the rectifying tower 1.

[0029] The flow regulating valve 16 regulates the flow of raw materials into the rectifying tower 1.

[0030] In this embodiment, the end of the condensate pipe 9 is provided with a pressure regulating valve 17 for regulating the pressure at the top of the tower.

[0031] The pressure regulating valve 17 regulates the pressure at the top of the tower.

[0032] In this embodiment, the condensate pipe 9 is connected with a reflux pipe 18 at the lower middle part, and the end of the reflux pipe 18 is connected to the top of the rectifying tower 1 for refluxing part of the condensate into the rectifying tower 1, and the reflux pipe 18 is provided with a reflux regulating valve 19 for regulating the flow of reflux liquid.

[0033] The reflux pipe 18 refluxes part of the condensate into the rectifying tower 1, and the reflux regulating valve 19 regulates the flow of reflux liquid.

[0034] In the specific application, first, open the flow regulating valve 16 on the feed pipe 3, accurately adjust the raw material flow according to the operation of the rectifying tower 1 and the production demand, make the raw material enter the middle part of the rectifying tower 1 through the feed pipe 3, after the raw material enters the rectifying tower 1, carry out the gas-liquid mass transfer process on the multiple sieve trays 2 installed at equal intervals, the gas rises and the liquid descends, since the sieve holes 11 are uniformly distributed on the tray 2, the gas and the liquid can fully contact and mix, the impurities and the carbon dioxide are separated, the liquid at the bottom of the rectifying tower 1 flows into the reboiler 5 through the reboiling inlet pipe 4, the heating medium enters the reboiler 5 through the heating medium conveying pipe 12, heats the liquid, and the heated medium is discharged through the heating medium discharge pipe 13, so as to accurately control the heating power, after the liquid is heated and vaporized, the density is reduced and rises, returns to the middle part of the rectifying tower 1 through the reboiling outlet pipe 6, forms a natural circulation, maintains the heat and material balance in the rectifying tower 1, the steam rising in the rectifying tower 1 enters the condenser 7 through the condensing inlet pipe 8, the cooling medium enters the condenser 7 through the cooling medium conveying pipe 14, takes away the heat of the steam, makes the steam cool into liquid, and then the cooling medium flows out through the cooling medium discharge pipe 15, the condensed liquid is discharged through the condensing outlet pipe 9, at this time, the pressure regulating valve 17 at the tail end of the condensing outlet pipe 9 adjusts the tower top pressure in real time, ensures the gas-liquid two-phase balance and the separation effect in the rectifying tower 1, meanwhile, the reflux pipe 18 connected below the middle part of the condensing outlet pipe 9 returns part of the condensed liquid to the tower top of the rectifying tower 1, the reflux regulating valve 19 on the reflux pipe 18 adjusts the flow of the reflux liquid, controls the reflux ratio in the rectifying tower 1, and optimizes the separation effect of the rectification process.

[0035] In the description of the utility model, it is to be explained that, the orientation or position relation indicated by the terms "top", "bottom", "one side", "the other side", "front", "back", "intermediate position", "interior", "top end", "bottom end" and the like is the orientation or position relation based on the drawing shown, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation to the utility model; the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the intercommunication of two elements inside. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] Finally, it should be noted that: the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. A distillation apparatus for industrial carbon dioxide production, characterized in that, The distillation column (1) includes multiple trays (2) installed at equal intervals inside the distillation column (1). A feed pipe (3) is installed in the middle of the side of the distillation column (1). A reboiler inlet pipe (4) is installed at the bottom of the side of the distillation column (1). The reboiler inlet pipe (4) is connected to the bottom of the side of the reboiler (5). A reboiler outlet pipe (6) is installed at the top of the reboiler (5) and is connected to the middle of the side of the distillation column (1). A condenser (7) is installed at the top of the distillation column (1). A condenser inlet pipe (8) is installed between the middle of the side of the condenser (7) and the top of the distillation column (1). A condenser outlet pipe (9) is installed at the bottom of the condenser (7). A feed pipe (10) is installed at the bottom of the distillation column (1).

2. The distillation apparatus for industrial carbon dioxide production according to claim 1, characterized in that, The tray (2) is a perforated tray with a number of perforated sieves (11) evenly distributed on it.

3. The distillation apparatus for industrial carbon dioxide production according to claim 1, characterized in that, The reboiler (5) is a horizontal thermosiphon reboiler. The heating medium inlet of the reboiler (5) is connected to a heating medium delivery pipe (12), and the heating medium outlet is connected to a heating medium discharge pipe (13).

4. The distillation apparatus for industrial carbon dioxide production according to claim 1, characterized in that, The condenser (7) is a shell-and-tube condenser. The cooling medium inlet of the condenser (7) is connected to a cooling medium delivery pipe (14), and the cooling medium outlet is connected to a cooling medium discharge pipe (15).

5. A distillation apparatus for industrial carbon dioxide production according to claim 1, characterized in that, The feed pipe (3) is equipped with a flow regulating valve (16) for regulating the flow rate of the raw material entering the distillation column (1).

6. A distillation apparatus for industrial carbon dioxide production according to claim 1, characterized in that, A pressure regulating valve (17) is provided at the end of the condenser outlet pipe (9) to regulate the pressure at the top of the tower.

7. A distillation apparatus for industrial carbon dioxide production according to claim 1, characterized in that, A reflux pipe (18) is connected to the lower middle part of the condenser outlet pipe (9). The end of the reflux pipe (18) is connected to the top of the distillation column (1) to return part of the condensate to the distillation column (1). A reflux regulating valve (19) is provided on the reflux pipe (18) to regulate the flow rate of the reflux liquid.

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