System for producing high-purity carbon monoxide

Abstract

The present application discloses a system for producing high purity carbon monoxide, which is performed by a system comprising a single impurity removal rectifying tower and at least one concentration rectifying tower, the impurity removal rectifying tower comprising an impurity removal tower body, an impurity removal reboiler and a reflux condenser, wherein the impurity removal reboiler is arranged at the bottom of the impurity removal tower body to vaporize the liquid deposited at the bottom of the impurity removal tower body by heat exchange, wherein the reflux condenser is arranged at the top of the impurity removal tower body, wherein one end of the reflux condenser is communicated with the middle upper part of the impurity removal tower body, and the outlet is communicated with the impurity removal tower body, and the concentration rectifying tower comprises a concentration tower body and a concentration condenser arranged at the top of the concentration tower body, wherein the concentration condenser is arranged to condense the impurity-removed gas into the concentration tower body, and the middle part of the concentration tower body is communicated with the outlet of the impurity-removed gas at the top of the impurity removal tower body.

Description

TECHNICAL FIELD

[0001] The present application relates to a gas preparation system, in particular to a high-purity carbon monoxide preparation system. BACKGROUND

[0002] High-purity CO, i.e. 5N carbon monoxide, requires a purity of 99.999% of CO. High-purity CO is mainly applied in the field of high-end electronic chip production. In addition, bottled high-purity carbon monoxide is often used for the preservation of tilapia and is an excellent gas colorant for aquatic products. High-purity carbon monoxide is also often used to prepare carbon monoxide standard gas to calibrate carbon monoxide alarms.

[0003] In addition, high-purity carbon monoxide is also used for the synthesis of fine chemicals such as medicines, pesticides, spices, and important intermediates, as a reducing gas for metal reduction to purify certain metals. It is worth mentioning that high-purity carbon monoxide can also be used as fuel for fuel cells.

[0004] At present, the methods for producing CO include PSA pressure swing adsorption process and NHD solvent polyoxymethylene dimethyl ether method. The pressure swing adsorption method has the disadvantages of complex process, low extraction rate, and cumbersome operation, etc., which requires four adsorption barrels for step-by-step adsorption. The NHD solvent polyoxymethylene dimethyl ether method is only suitable for preparing a small amount of high-purity CO, and for the preparation of a large amount of CO, a large amount of chemical reagents needs to be consumed through the NHD solvent polyoxymethylene dimethyl ether method. In addition, whether through the PSA pressure swing adsorption process or the NHD solvent polyoxymethylene dimethyl ether method, the purity of the prepared CO is difficult to guarantee above 99.999%.

[0005] More importantly, when high-purity CO is prepared by using the existing technology, a part of CO will be discharged, resulting in the waste of CO gas. SUMMARY

[0006] An advantage of the present application is to provide a high-purity carbon monoxide preparation system, wherein the high-purity carbon monoxide preparation system can effectively prepare carbon monoxide with a purity of above 99.999%.

[0007] Another advantage of the present application is to provide a high-purity carbon monoxide preparation system, wherein the high-purity carbon monoxide preparation system can effectively prepare high-purity carbon monoxide without additional cooling source.

[0008] Another advantage of the present application is to provide a high-purity carbon monoxide preparation system, wherein the high-purity carbon monoxide preparation system can effectively remove impurity gases such as methane, oxygen, argon, nitrogen, and hydrogen from the raw gas.

[0009] Another advantage of the present application is to provide a high-purity carbon monoxide preparation system, which can effectively ensure the purity of the final high-purity carbon monoxide product gas.

[0010] To achieve at least one of the above advantages, the present application provides a high-purity carbon monoxide preparation system, characterized in that the high-purity carbon monoxide preparation system comprises:

[0011] at least one impurity removal rectifying tower, which comprises an impurity removal tower body, an impurity removal reboiler and a reflux condenser, wherein the impurity removal reboiler is arranged at the bottom of the impurity removal tower body to vaporize the liquid deposited at the bottom of the impurity removal tower body by heat exchange, and the reflux condenser is arranged at the top of the impurity removal tower body, one end of the reflux condenser being communicated with the upper middle part of the impurity removal tower body and the outlet being communicated with the impurity removal tower body;

[0012] at least one concentration rectifying tower, which comprises a concentration tower body and a concentration condenser arranged at the top of the concentration tower body, wherein the concentration condenser is arranged to condense the impurity-removed gas flowing into the concentration tower body, and the middle part of the concentration tower body is communicated with the outlet of the impurity-removed gas at the top of the impurity removal tower body.

[0013] According to an embodiment of the present application, the top of the concentration tower body is provided with at least one detector, the high-purity carbon monoxide preparation device comprises a first electromagnetic valve, a second electromagnetic valve, a first reflux channel and a waste discharge channel, wherein the first electromagnetic valve is arranged in the first reflux channel, the second electromagnetic valve is arranged in the waste discharge channel, the first electromagnetic valve is used to control the opening and closing of the reflux channel, the second electromagnetic valve is used to control the opening and closing of the waste discharge channel, the first reflux channel and the waste discharge channel are both communicated with the outlet of the concentration tower body, the other end of the first reflux channel is communicated with the upper middle part of the impurity removal tower body, when the first detector detects that the concentration of carbon monoxide in the discharged gas is too high, the second electromagnetic valve is closed and the first electromagnetic valve is opened, and when the first detector detects that the concentration of carbon monoxide in the discharged gas is lower than the preset value, the second electromagnetic valve is opened and the first electromagnetic valve is closed.

[0014] According to an embodiment of the present application, the concentration rectifying tower is further provided with a second reflux channel, one end of the second reflux channel being communicated with the upper middle part of the concentration tower body and the other end being communicated with the concentration condenser.

[0015] According to an embodiment of the present application, the preparation device of high-purity carbon monoxide further comprises a discharge channel, at least one return channel, a second detector, a third electromagnetic valve and a fourth electromagnetic valve, one end of each of the discharge channel and the return channel is communicated with the bottom of the enrichment column body, wherein the third electromagnetic valve and the fourth electromagnetic valve are arranged in the discharge channel and the return channel respectively, and the second detector is arranged at the bottom liquid outlet of the enrichment column body.

[0016] According to an embodiment of the present application, the bottom of the enrichment rectifying column further comprises an enrichment reboiler.

[0017] According to an embodiment of the present application, the preparation device of high-purity carbon monoxide further comprises a heat exchanger, wherein the heat exchanger is arranged on the flow path of a raw material gas inlet channel.

[0018] According to an embodiment of the present application, the preparation device of high-purity carbon monoxide comprises a vaporizer, wherein the vaporizer is arranged in communication with the discharge channel, so as to vaporize the liquid high-purity carbon monoxide led out from the discharge channel into gas. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 A schematic diagram of a first embodiment of the preparation device of high-purity carbon monoxide is shown.

[0020] Fig. 2 A schematic diagram of a second embodiment of the preparation device of high-purity carbon monoxide is shown.

[0021] REFERENCE NUMERALS:

[0022] Preparation device of high-purity carbon monoxide 100;

[0023] Impurity removal rectifying column 10; impurity removal column body 11; impurity removal reboiler 12; return flow condenser 13;

[0024] Enrichment rectifying column 20; enrichment column body 21; enrichment reboiler 22; enrichment condenser 23;

[0025] First detector 31; second detector 32;

[0026] First electromagnetic valve 41; second electromagnetic valve 42; third electromagnetic valve 43; fourth electromagnetic valve 44;

[0027] First return flow channel 51A; second return flow channel 51B; waste discharge channel 52; discharge channel 53; return channel 54;

[0028] Heat exchanger 60; raw material gas inlet channel 70

[0029] Heat exchange agent supply assembly 80; nitrogen supply tank 81; supply channel 83; first cold source inflow channel 831; second cold source inflow channel 832; docking channel 833; first heat source inflow channel 835; second heat source inflow channel 836; first liquid outflow channel 837; second liquid outflow channel 838; subcooler 85. DETAILED DESCRIPTION

[0030] The following description is presented to enable any person skilled in the art to practice the present application as claimed. The preferred embodiments disclosed herein are only examples of the present application and alternative embodiments can be devised by those skilled in the art without departing from the spirit and scope of the present application. The present application is directed to the basic principles of the present application defined in the following description, which can be applied to other embodiments, adaptations, improvements, equivalents and other implementations without departing from the spirit and scope of the present application.

[0031] Those skilled in the art will understand that, in the disclosure of the present application, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0032] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0033] Reference Figs. 1-2 A high-purity carbon monoxide preparation system according to a preferred embodiment of the present application will be described in detail below, wherein the high-purity carbon monoxide preparation system is performed by a high-purity carbon monoxide preparation device 100.

[0034] Specifically, the high-purity carbon monoxide preparation device 100 includes at least one impurity removal rectifying tower 10 and at least one concentration rectifying tower 20.

[0035] The impurity removal rectifying tower 10 includes an impurity removal tower body 11 and an impurity removal reboiler 12. The impurity removal reboiler 12 is arranged at the bottom of the impurity removal tower body 11, and is used to vaporize the liquid deposited at the bottom of the impurity removal tower body 11 by heat exchange, so that high-boiling-point impurity gases such as nitrogen, methane and argon are retained at the bottom of the impurity removal tower body 11, and low-boiling-point nitrogen and hydrogen can be accumulated together with carbon monoxide in the upper part of the impurity removal tower body 11.

[0036] As preferred, the impurity removal rectification column 10 further comprises a reflux condenser 13, wherein the reflux condenser 13 is arranged at the top of the impurity removal column body 11, and one end of the reflux condenser 13 is communicated with the middle upper portion of the impurity removal column body 11, and the outlet of the reflux condenser 13 is communicated with the impurity removal column body 11.

[0037] As can be understood by those skilled in the art, in this way, at least a part of the gas gathered in the middle upper portion of the impurity removal column body 11 can be condensed by the reflux condenser 13, and flows back to the bottom of the impurity removal column body 11 in the form of liquid from top to bottom. During the liquid backflow, it is in constant heat exchange with the gas vaporized from bottom to top by the impurity removal reboiler 12, so as to wash out a small amount of high-boiling impurity gas such as nitrogen, methane and argon in the gas and drop to the bottom of the impurity removal reboiler 12, thereby increasing the concentration of CO in the gas flowing out of the impurity removal rectification column 10.

[0038] As can be understood by those skilled in the art, in this way, the high-boiling impurity gas such as nitrogen, methane and argon in the raw material gas can be effectively and efficiently removed.

[0039] In a preferred embodiment, the high-purity carbon monoxide preparation device 100 comprises a plurality of the impurity removal rectification columns 10 arranged in parallel, so that a plurality of the impurity removal rectification columns 10 can remove the high-boiling impurity gas in the raw material gas.

[0040] It is worth mentioning that the gas formed after rectification by the impurity removal rectification column 10 is introduced into the concentration rectification column 20.

[0041] Specifically, the concentration rectification column 20 comprises a concentration column body 21 and a concentration condenser 23 arranged at the top of the concentration column body 21, wherein the concentration condenser 23 is arranged to condense the impurity-removed gas introduced into the concentration column body 21, i.e. the gas containing carbon monoxide, nitrogen and hydrogen.

[0042] As preferred, the impurity-removed gas is introduced from the middle portion of the concentration column body 21, i.e. the middle portion of the concentration column body 21 is communicated with the outlet of the impurity-removed gas at the top of the impurity removal column body 11. In this way, when the liquid formed by cooling by the concentration condenser 23 drops from top to bottom, it can meet the impurity-removed gas introduced from the middle portion of the concentration column body 21 and exchange heat, so as to wash out at least part of the carbon monoxide in the impurity-removed gas into liquid droplets, which are further enriched in the bottom of the concentration column body 21 together with the liquid.

[0043] The skilled in the art can understand that the product gas finally formed by the treatment of the impurity removal distillation column 10 and the concentration distillation column 20 can effectively ensure the purity of the final product.

[0044] As a preference, the upper middle part of the concentration column body 21 is connected to the inlet of the concentration condenser 23, and the outlet of the concentration condenser 23 is connected to the concentration column body 21. In this way, the mixed gas containing a large amount of carbon monoxide and a small amount of nitrogen and hydrogen entering the concentration condenser 23 is cooled to droplets by the concentration condenser 23 and falls from top to bottom, and exchanges heat with the impurity-removed gas flowing from the middle part of the concentration column body 21 to the top, so that at least part of the carbon monoxide in the impurity-removed gas can be washed out as droplets. In this way, the purity of the CO liquid condensed through the concentration column body 21 can be improved.

[0045] As a preference, at least one first detector 31 is arranged at the top of the concentration column body 21 to detect the concentration of carbon monoxide discharged from the concentration column body 21.

[0046] The preparation device 100 of high-purity carbon monoxide includes a first electromagnetic valve 41, a second electromagnetic valve 42, a first reflux passage 51A, and a waste passage 52. The first electromagnetic valve 41 is arranged in the first reflux passage 51A, and the second electromagnetic valve 42 is arranged in the waste passage 52. The first electromagnetic valve 41 is used to control the opening and closing of the reflux passage 50, and the second electromagnetic valve 42 is used to control the opening and closing of the waste passage 52. One end of the first reflux passage 51A and one end of the waste passage 52 are connected to the outlet of the concentration column body 21. The other end of the first reflux passage 51A is connected to the upper middle part of the impurity removal column body 11, and the other end of the waste passage 52 can be connected to the atmosphere.

[0047] When the first detector 31 detects that the concentration of carbon monoxide in the discharged gas is too high, the second electromagnetic valve 42 is closed, and the first electromagnetic valve 41 is opened. In this way, the carbon monoxide gas with too high content can be refluxed to the impurity removal column body 11 for further treatment. In this way, on the one hand, it can effectively avoid the waste caused by the excessive discharge of carbon monoxide in the raw gas. More importantly, the gas introduced into the upper middle part of the impurity removal column body 11 is mainly light components, so that after being introduced into the upper middle part of the impurity removal column body 11, the falling speed of the droplets formed by condensation through the reflux condenser 13 can be slowed down, and the gas and the liquid can be fully heat-exchanged, thereby further improving the concentration of carbon monoxide flowing out of the impurity removal column body 11.

[0048] Conversely, if the first detector 31 detects that the concentration of carbon monoxide in the exhaust gas is lower than the preset value, the second electromagnetic valve 42 is opened and the first electromagnetic valve 41 is closed, so that the exhaust gas can be directly discharged via the exhaust passage 52.

[0049] Preferably, the concentration rectification tower 20 is further provided with a second reflux passage 51B, one end of which is connected to the middle upper part of the concentration tower body 21 and the other end of which is connected to the concentration condenser 23. In this way, at least part of the gas entering the middle upper part of the concentration tower body 21 can be condensed to liquid, so that the condensed liquid exchanges heat with the gas entering the concentration tower body 21 from top to bottom.

[0050] Preferably, the high-purity carbon monoxide preparation device 100 further comprises a discharge passage 53, at least one liquid return passage 54, a second detector 32, a third electromagnetic valve 43 and a fourth electromagnetic valve 44.

[0051] Specifically, one end of the discharge passage 53 and one end of the liquid return passage 54 are respectively connected to the bottom of the concentration tower body 21, and the third electromagnetic valve 43 and the fourth electromagnetic valve 44 are respectively arranged in the discharge passage 53 and the liquid return passage 54. The second detector 32 is arranged at the bottom liquid outlet of the concentration tower body 21.

[0052] The other end of the liquid return passage 54 is connected to the inlet of the impurity removal reboiler 12.

[0053] As understood by those skilled in the art, when the purity of the liquid flowing out of the concentration tower body 21 is lower than the required purity, the third electromagnetic valve 43 is closed and the fourth electromagnetic valve 44 is opened, so that high-purity liquid carbon monoxide can be refluxed into the impurity removal reboiler 12 via the liquid return passage 54. In this way, on the one hand, the gas entering the impurity removal reboiler 12 can be further cooled, and on the other hand, the efficiency of the gas-liquid heat exchange in the impurity removal tower body 21 can be regulated by increasing the flow rate of the liquid dripping from the impurity removal reboiler 12 from top to bottom, so that the content of impurity gases such as nitrogen, methane and argon in the gas flowing out of the impurity removal tower body 21 can be reduced. At the same time, since the liquid refluxed into the impurity removal reboiler 12 via the liquid return passage 54 is itself relatively high-purity carbon monoxide liquid, the purity of carbon monoxide in the gas flowing out of the impurity removal tower body 11 after being removed by the impurity removal rectification tower 10 can be effectively improved.

[0054] Preferably, the bottom of the concentration rectification tower 20 is also provided with a concentration reboiler 22. The concentration reboiler 22 can evaporate the nitrogen and hydrogen gas in the liquid dropped to the bottom of the concentration tower body 21 into gas, thereby effectively removing the nitrogen and hydrogen gas and other impurities in the liquid at the bottom of the concentration tower body 21.

[0055] Those skilled in the art can understand that, through the above-mentioned manner, the content of liquid carbon monoxide in the liquid flowing out through the discharge channel 53 can reach 99.999%.

[0056] Preferably, the high-purity carbon monoxide preparation device 100 further comprises a heat exchanger 60, wherein the heat exchanger 60 is arranged on the flow path of a raw material gas inlet channel 70. One end of the raw material gas inlet channel 70 is communicated with the impurity removal tower body 11.

[0057] The raw material gas at room temperature is usually high in temperature, and can be condensed to a semi-wet state after heat exchange with the heat exchanger 60, so as to be removed in the impurity removal rectification tower 10.

[0058] Further, the high-purity carbon monoxide preparation device 100 further comprises a heat exchange agent supply assembly 80. The heat exchange agent supply assembly 80 comprises a nitrogen supply tank 81 and at least one supply channel 83.

[0059] Specifically, the supply channel 83 comprises at least a first cold source inflow channel 831, a second cold source inflow channel 832 and a docking channel 833.

[0060] The supply channel 83 further comprises a first heat source inflow channel 835 and a first liquid outlet channel 837. As preferred, the supply channel 83 comprises a second heat source inflow channel 836 and a second liquid outlet channel 838.

[0061] Specifically, one end of the first cold source inflow channel 831 and the second cold source inflow channel 832 is respectively communicated with the nitrogen supply tank 81, and the other end of each is respectively communicated with the condensate inlet of the reflux condenser 13 and the condensate inlet of the concentration condenser 23.

[0062] The docking channel 833 is communicated with the condensate outlet of the reflux condenser 13 and the condensate outlet of the concentration condenser 23.

[0063] It is worth mentioning that, preferably, the reflux condenser 13 and the concentration condenser 23 exchange heat between the gas inside and the condensate outside during operation, so that the condensate is vaporized to form gas.

[0064] Preferably, the heat-exchange agent supply assembly 80 further comprises a sub-cooler 85, wherein the sub-cooler 85 is arranged in the flow path of the docking passage 833 to recover part of the heat of the condensed agent flowing out of the docking passage 833 and the first liquid outlet passage 837.

[0065] The other end of the docking passage 833 is connected to the heat source inlet of the first heat source inflow passage 835 of the impurity removal reboiler 12 and the heat source inlet of the second heat source inflow passage 836 of the concentration reboiler 22. The one end of the first liquid outlet passage 837 and the second liquid outlet passage 838 are connected to the outlet of the impurity removal reboiler 12 and the outlet of the concentration reboiler 22 respectively, and the other end of the first liquid outlet passage 837 and the second liquid outlet passage 838 are connected to the condensed agent inlet of the reflux condenser 13 and the condensed agent inlet of the concentration condenser 23 respectively.

[0066] Those skilled in the art can understand that the relatively hot gaseous nitrogen flowing out of the docking passage 833 can provide heat source for the impurity removal reboiler 12 and the concentration reboiler 22. And at the same time, during the operation of the impurity removal reboiler 12 and the concentration reboiler 22, the gaseous nitrogen will be changed into liquid nitrogen by exchanging heat with the liquid at the bottom of the impurity removal column 11 and the concentration column 21 respectively, and then the liquid nitrogen can return to the condensed agent inlet of the reflux condenser 13 and the condensed agent inlet of the concentration condenser 23 through the first liquid outlet passage 837 and the second liquid outlet passage 838.

[0067] In this way, the heat-exchange agent supply assembly 80 can provide heat source and cold source for the entire high-purity carbon monoxide preparation device 100.

[0068] In one embodiment, the common part of the first liquid outlet passage 837 and the second liquid outlet passage 838 also passes through the sub-cooler 85, so that the nitrogen returning to the condensed agent inlet of the reflux condenser 13 and the condensed agent inlet of the concentration condenser 23 is low-temperature liquid nitrogen.

[0069] More preferably, the heat-exchange agent supply assembly 80 further comprises a compression member 87, wherein the compression member 87 is arranged between the docking passage 833 and the heat source inlets of the impurity removal reboiler 12 and the concentration reboiler 22, so that the nitrogen flowing out of the docking passage 833 can be compressed before entering the heat source inlets of the impurity removal reboiler 12 and the concentration reboiler 22, thereby reaching the required temperature.

[0070] More preferably, the high-purity carbon monoxide preparation apparatus 100 further comprises a vaporizer 90, wherein the vaporizer 90 is arranged in communication with the discharge channel 53 for vaporizing the liquid high-purity carbon monoxide led out from the discharge channel 53 into gas, so that the user can directly use the gaseous high-purity carbon monoxide.

[0071] It is worth mentioning that through the cooperation of the heat exchange agent supply assembly 80, the heat exchanger 60 and the supercooler 85, the heat source and the cold source can be effectively provided, and additional supplemental liquid nitrogen is basically not required.

[0072] It should be understood by those skilled in the art that the above description and the embodiments of the present application shown in the drawings are only examples and do not limit the present application. The advantages of the present application have been fully and effectively achieved. The functions and structural principles of the present application have been shown and described in the embodiments, and the embodiments of the present application can be modified or changed in any way without departing from the principles.

Claims

1. A high purity carbon monoxide production system, characterized by, The high-purity carbon monoxide preparation system comprises: at least one impurity removal rectifying tower, which comprises an impurity removal tower body, an impurity removal reboiler and a reflux condenser, wherein the impurity removal reboiler is arranged at the bottom of the impurity removal tower body to vaporize the liquid deposited at the bottom of the impurity removal tower body through heat exchange, and the reflux condenser is arranged at the top of the impurity removal tower body, one end of the reflux condenser being communicated with the middle upper portion of the impurity removal tower body and the outlet being communicated with the impurity removal tower body; at least one concentration rectifying tower, which comprises a concentration tower body and a concentration condenser arranged at the top of the concentration tower body, wherein the concentration condenser is arranged to condense the impurity-removed gas flowing into the concentration tower body, and the middle portion of the concentration tower body is communicated with the outlet of the impurity-removed gas at the top of the impurity removal tower body; a first detector arranged at the top of the concentration tower body, the high-purity carbon monoxide preparation device comprising a first electromagnetic valve, a second electromagnetic valve, a first reflux channel and a waste discharge channel, wherein the first electromagnetic valve is arranged in the first reflux channel, the second electromagnetic valve is arranged in the waste discharge channel, the first electromagnetic valve is used to control the opening and closing of the first reflux channel, the second electromagnetic valve is used to control the opening and closing of the waste discharge channel, the first reflux channel and the waste discharge channel are both communicated with the outlet of the concentration tower body, the other end of the first reflux channel is communicated with the middle upper portion of the impurity removal tower body, when the first detector detects that the concentration of carbon monoxide in the discharged gas is too high, the second electromagnetic valve is closed and the first electromagnetic valve is opened, and when the first detector detects that the concentration of carbon monoxide in the discharged gas is lower than the preset value, the second electromagnetic valve is opened and the first electromagnetic valve is closed; the high-purity carbon monoxide preparation device further comprises a discharge channel, at least one liquid return channel, a second detector, a third electromagnetic valve and a fourth electromagnetic valve, one end of the discharge channel and the liquid return channel is respectively communicated with the bottom of the concentration tower body, the third electromagnetic valve and the fourth electromagnetic valve are respectively arranged in the discharge channel and the liquid return channel, and the second detector is arranged at the liquid outlet of the concentration tower body; the concentration rectifying tower is further provided with a second reflux channel, one end of the second reflux channel being communicated with the middle upper portion of the concentration tower body and the other end being communicated with the concentration condenser.

2. The system for producing high-purity carbon monoxide according to claim 1, wherein The bottom of the concentration rectifying tower is further provided with a concentration reboiler.

3. The system for producing high-purity carbon monoxide according to claim 1, wherein The high-purity carbon monoxide preparation device further comprises a heat exchanger, which is arranged in the flow path of a raw gas inlet channel.

4. The system for producing high-purity carbon monoxide according to claim 1, wherein The high-purity carbon monoxide preparation device comprises a vaporizer, which is arranged in communication with the discharge channel to vaporize the liquid high-purity carbon monoxide discharged from the discharge channel into gas.

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