Carbon monoxide purification system

Abstract

The utility model relates to a carbon monoxide purification system which comprises a first rectification device and a second rectification device, and the first rectification device and the second rectification device respectively comprise a rectification tower, a first packing layer, a second packing layer, a condenser and an evaporator; a raw material gas conveying pipe is arranged on the rectifying tower of the first rectifying device, a process gas conveying pipe is arranged at the top of the rectifying tower of the first rectifying device, the process gas conveying pipe is communicated with the rectifying tower of the second rectifying device, a first product conveying pipe is arranged on the evaporator of the second rectifying device, and a temporary storage tank is arranged on the first product conveying pipe; a second product conveying pipe is arranged on the temporary storage tank, a steam conveying pipe is arranged on the temporary storage tank, and the steam conveying pipe is communicated with the rectifying tower of the second rectifying device. The carbon monoxide gas with the concentration of 99% prepared by a pressure swing adsorption method is used as a raw material to prepare an ultrahigh-concentration carbon monoxide product. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of carbon monoxide purification equipment, in particular to a carbon monoxide purification system. Background Art

[0002] High-purity carbon monoxide usually refers to extremely pure carbon monoxide gas, which can reach more than 99.9% or even higher. According to different application requirements, the purity can be further increased to 99.99%, 99.999% or even higher. High-purity carbon monoxide can be produced by a variety of methods, including partial oxidation, water-gas shift reaction, synthesis gas separation, etc. The impurity content needs to be strictly controlled during the production process to ensure the high purity of the final product. High-purity nitrogen and carbon monoxide are widely used in the metallurgical industry, semiconductor industry and chemical industry. In the metallurgical industry, high-purity carbon monoxide is mainly used in the production of polycrystalline diamond films, nickel purification, metal film purification (such as tungsten film, molybdenum film, etc.) and as a reducing agent. In the semiconductor manufacturing process, high-purity carbon monoxide is used in the production of integrated circuits, liquid crystal panels, LEDs and other products. In the chemical industry, high-purity carbon monoxide is mainly used as organic synthesis raw materials (such as phosgene synthesis, formic acid synthesis, etc.), chemical fuels and reducing agents. Among them, the concentration of carbon monoxide required by the chemical industry and the semiconductor industry must reach at least 99.9%.

[0003] High-purity carbon monoxide is obtained by purifying carbon monoxide raw gas step by step. The mainstream process for obtaining high-abundance carbon monoxide raw gas in the existing technology is coal-to-gas production using coal as raw material, desulfurization through an alkali scrubber, and then dehydration and decarbonization through multiple stages of pressure swing adsorption, thereby obtaining a carbon monoxide product gas with a concentration of 99%. Although the pressure swing adsorption method for producing a carbon monoxide product gas with a concentration of 99% is a very mature process, it is very difficult to produce ultra-high concentration carbon monoxide with a concentration of more than 99.99% using the pressure swing adsorption method alone. Specifically, the coal-to-gas production using coal as raw material is realized by burning coal in an oxygen-rich environment. To obtain an oxygen-rich environment, an oxygen source must be provided to mix with compressed air. However, due to the characteristics of argon, it is not easy to separate from oxygen, so a large amount of argon will be mixed in the oxygen used as the oxygen source, and the highest content of the component in the air is nitrogen. The carbon monoxide product produced by the pressure swing adsorption method has a small amount of argon and nitrogen impurities, but the cost of further processing a small amount of argon and nitrogen impurities by the pressure swing adsorption method to obtain an ultra-high concentration carbon monoxide product with a concentration exceeding 99.99% is too high. Therefore, in the prior art, the 99% carbon monoxide product gas obtained by the general pressure swing adsorption method is reprocessed, so that a large amount of ultra-high concentration carbon monoxide with a concentration exceeding 99.99% can be industrially obtained as a deep processing product, which meets market demand and enables enterprises to make products more diversified on the basis of carbon monoxide as a product, improve the adaptability of enterprises in the market, and also improve the promotion of ultra-high concentration carbon monoxide production devices using carbon monoxide raw gas with a concentration of 99% as raw materials to match market demand. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides a carbon monoxide purification system which utilizes carbon monoxide gas with a concentration of 99% produced by a pressure swing adsorption method as a raw material to produce an ultra-high concentration carbon monoxide product, so as to overcome the defects in the prior art.

[0005] The technical solution adopted by the utility model is: a carbon monoxide purification system, comprising a first distillation device and a second distillation device, wherein the first distillation device and the second distillation device both comprise a distillation tower, a first packing layer and a second packing layer arranged in sequence from top to bottom in the distillation tower, a condenser arranged at the top of the distillation tower, and a cold source channel of an evaporator arranged at the bottom of the distillation tower and connected to the inner cavity of the distillation tower; a raw gas delivery pipe is arranged on the distillation tower of the first distillation device, and the outlet end of the raw gas delivery pipe is located between the first packing layer and the second packing layer of the first distillation device, and the condenser is arranged at the top of the distillation tower and connected to the inner cavity of the distillation tower; the condenser is arranged at the top of the distillation tower and the cold source channel of the evaporator is arranged at the bottom ... The top of the distillation tower of the first distillation device is provided with an inlet end of a process gas delivery pipe, the outlet end of the process gas delivery pipe is connected with the distillation tower of the second distillation device, the outlet end of the process gas delivery pipe is located between the first packing layer and the second packing layer of the second distillation device, the evaporator of the second distillation device is provided with a first product delivery pipe, the first product delivery pipe is provided with a temporary storage tank, the bottom of the temporary storage tank is provided with a second product delivery pipe, the top of the temporary storage tank is provided with an inlet end of a steam delivery pipe, and the outlet end of the steam delivery pipe is connected with the bottom of the distillation tower of the second distillation device.

[0006] Preferably, the first distillation device and the second distillation device also include a top gas delivery pipe arranged on the top of the distillation tower and the inlet end of the condenser heat source channel, a reflux liquid delivery pipe arranged on the top of the distillation tower and the outlet end of the condenser heat source channel, a cold source delivery pipe arranged on the outlet end of the evaporator heat source channel and the cold source channel of the condenser, a first regulating valve and the outlet end of the liquid nitrogen delivery branch pipe arranged in sequence on the cold source delivery pipe along the direction from the condenser to the evaporator, and a second regulating valve respectively arranged on the liquid nitrogen delivery branch pipe and the reflux liquid delivery pipe.

[0007] Preferably, the first distillation device and the second distillation device further include an outlet end of a pressure nitrogen delivery branch pipe arranged on the inlet end of the evaporator heat source channel, an inlet end of a vaporized nitrogen delivery pipe arranged on the top end of the condenser cold source channel, and a third regulating valve respectively arranged on the vaporized nitrogen delivery pipe and the pressure nitrogen delivery branch pipe; the outlet end of a nitrogen boosting pipe is arranged on the inlet end of a plurality of pressure nitrogen delivery branches, and the nitrogen boosting pipe is sequentially provided with a recuperator, a nitrogen compression unit and a main heat exchanger in a direction away from the pressure nitrogen delivery branch pipe to close to the pressure nitrogen delivery branch pipe; a plurality of vaporized nitrogen delivery pipes and the main heat exchanger are provided with nitrogen reflux pipes, the outlet ends of a plurality of vaporized nitrogen delivery pipes are connected to the inlet end of the nitrogen reflux pipe, some nitrogen reflux pipes are installed on the main heat exchanger, and the outlet end of the nitrogen reflux pipe is connected to the inlet end of the nitrogen boosting pipe.

[0008] Preferably, part of the raw gas delivery pipes are installed on the main heat exchanger, and the top gas delivery pipe of the second distillation device is provided with a first pressure sensor, an inlet end of a first exhaust gas discharge pipe and a fourth regulating valve in sequence along the direction from the distillation tower of the second distillation device to the condenser of the second distillation device, the inlet end of the second exhaust gas discharge pipe is provided at the bottom of the distillation tower of the first distillation device, the first exhaust gas discharge pipe and the second exhaust gas discharge pipe are respectively provided with a fifth regulating valve, and the outlet end of the first exhaust gas discharge pipe, the outlet end of the second exhaust gas discharge pipe and the main heat exchanger are provided with a third exhaust gas discharge pipe.

[0009] Preferably, a liquid nitrogen storage tank is further included, wherein the top of the liquid nitrogen storage tank is provided with an inlet end of a supplementary gas delivery pipe, the vaporized nitrogen delivery pipe and the supplementary gas delivery pipe are respectively provided with a seventh regulating valve, the outlet end of the supplementary gas delivery pipe is connected to the inlet end of the nitrogen booster pipe, a one-way valve is provided on the nitrogen reflux pipe between the main heat exchanger and the nitrogen booster pipe, and the inlet ends of several liquid nitrogen delivery branches are all connected to the bottom of the liquid nitrogen storage tank.

[0010] Preferably, the first distillation device and the second distillation device further include first liquid level sensors respectively arranged on the cold source channel of the condenser and the cold source channel of the evaporator; and second liquid level sensors are respectively arranged on the liquid nitrogen storage tank and the temporary storage tank.

[0011] Preferably, the process gas delivery pipe is sequentially provided with a second pressure sensor and a sixth regulating valve along the direction from the first distillation device to the second distillation device, the steam delivery pipe is provided with a third pressure sensor, and the steam delivery pipe between the distillation tower of the second distillation device and the third pressure sensor, the first product delivery pipe and the second product delivery pipe are respectively provided with an eighth regulating valve.

[0012] The beneficial effects of the utility model are as follows: firstly, the utility model uses the carbon monoxide gas with a concentration of 99% prepared by the pressure swing adsorption method as a raw material, which is successively distilled by the first distillation device and the second distillation device to produce a liquid carbon monoxide crude product, and then flash evaporated in a temporary storage tank to form an ultra-high concentration refined carbon monoxide liquid product.

[0013] Secondly, the first distillation device and the second distillation device described in the utility model also include first liquid level sensors respectively arranged on the cold source channel of the condenser and the cold source channel of the evaporator; installing the first liquid level sensor facilitates feedback of the liquid level height.

[0014] Finally, a first pressure sensor, an inlet end of a first exhaust gas discharge pipe and a fourth regulating valve are sequentially arranged on the top gas conveying pipe of the second distillation device described in the utility model along the direction from the distillation tower of the second distillation device to the condenser of the second distillation device. The installation of the first pressure sensor facilitates the feedback of pressure parameters.

[0015] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A. DETAILED DESCRIPTION

[0018] like Figure 1 and Figure 2 As shown, a carbon monoxide purification system comprises a first distillation device and a second distillation device, wherein the first distillation device and the second distillation device both comprise a distillation tower 1, a first packing layer 2 and a second packing layer 3 arranged in sequence from top to bottom in the distillation tower 1, a condenser 4 arranged at the top of the distillation tower 1, and a cold source channel of an evaporator 5 arranged at the bottom of the distillation tower 1 and connected to the inner cavity of the distillation tower 1; a raw gas delivery pipe 6 is arranged on the distillation tower 1 of the first distillation device, and the outlet end of the raw gas delivery pipe 6 is located between the first packing layer 2 and the second packing layer 3 of the first distillation device; The top of the distillation tower 1 is provided with an inlet end of a process gas delivery pipe 7, and the outlet end of the process gas delivery pipe 7 is connected to the distillation tower 1 of the second distillation device. The outlet end of the process gas delivery pipe 7 is located between the first packing layer 2 and the second packing layer 3 of the second distillation device. The evaporator 5 of the second distillation device is provided with a first product delivery pipe 8, and a temporary storage tank 9 is provided on the first product delivery pipe 8. A second product delivery pipe 10 is provided at the bottom of the temporary storage tank 9. The top of the temporary storage tank 9 is provided with an inlet end of a steam delivery pipe 11, and the outlet end of the steam delivery pipe 11 is connected to the bottom of the distillation tower 1 of the second distillation device.

[0019] The first distillation device and the second distillation device also include an outlet end of a pressure nitrogen gas delivery branch pipe 18 arranged on the inlet end of the heat source channel of the evaporator 5, an inlet end of a vaporized nitrogen gas delivery pipe 19 arranged on the top of the cold source channel of the condenser 4, a third regulating valve 20 respectively arranged on the vaporized nitrogen gas delivery pipe 19 and the pressure nitrogen gas delivery branch pipe 18, a top gas delivery pipe 12 arranged on the top of the distillation tower 1 and the inlet end of the heat source channel of the condenser 4, a reflux liquid delivery pipe 13 arranged on the top of the distillation tower 1 and the outlet end of the heat source channel of the condenser 4, a cold source delivery pipe 14 arranged on the outlet end of the heat source channel of the evaporator 5 and the cold source channel of the condenser 4, a first regulating valve 15 and an outlet end of a liquid nitrogen delivery branch pipe 16 sequentially arranged on the cold source delivery pipe 14 along the direction from the condenser 4 to the evaporator 5, and a second regulating valve 17 respectively arranged on the liquid nitrogen delivery branch pipe 16 and the reflux liquid delivery pipe 13. The inner diameter of the cold source delivery pipe 14 between the evaporator 5 and the first regulating valve 15 is not greater than the inner diameter of the cold source delivery pipe 14 between the first regulating valve 15 and the condenser 4 .

[0020] The first distillation device and the second distillation device also include a fourth pressure sensor 42 arranged on the pressure nitrogen delivery branch pipe 18 between the third regulating valve 20 of the pressure nitrogen delivery branch pipe 18 and the heat source channel of the evaporator 5; the fourth pressure sensor 42 of the first distillation device is convenient for feedback of the pressure parameters of the heat source channel of the evaporator 5 of the first distillation device; the fourth pressure sensor 42 of the second distillation device is convenient for feedback of the pressure parameters of the heat source channel of the evaporator 5 of the second distillation device.

[0021] The outlet end of the nitrogen boosting pipe 21 is arranged on the inlet end of the plurality of pressure nitrogen delivery branch pipes 18. The nitrogen boosting pipe 21 is sequentially provided with a recuperator 22, a nitrogen compression unit 23 and a main heat exchanger 24 in the direction from away from the pressure nitrogen delivery branch pipe 18 to close to the pressure nitrogen delivery branch pipe 18. The recuperator 22 adopts an electric evaporator. The plurality of vaporized nitrogen delivery pipes 19 and the main heat exchanger 24 are provided with a nitrogen reflux pipe 25. The outlet ends of the plurality of vaporized nitrogen delivery pipes 19 are all connected to the inlet end of the nitrogen reflux pipe 25. Some of the nitrogen reflux pipes 25 are installed on the main heat exchanger 24. The outlet end of the nitrogen reflux pipe 25 is connected to the inlet end of the nitrogen boosting pipe 21.

[0022] Part of the raw gas delivery pipe 6 is installed on the main heat exchanger 24, and the first pressure sensor 26, the inlet end of the first exhaust gas discharge pipe 27 and the fourth regulating valve 28 are sequentially arranged on the top gas delivery pipe 12 of the second distillation device along the direction from the distillation tower 1 of the second distillation device to the condenser 4 of the second distillation device. The inlet end of the second exhaust gas discharge pipe 29 is arranged at the bottom of the distillation tower 1 of the first distillation device, and the first exhaust gas discharge pipe 27 and the second exhaust gas discharge pipe 29 are respectively provided with a fifth regulating valve 30, and the outlet end of the first exhaust gas discharge pipe 27, the outlet end of the second exhaust gas discharge pipe 29 and the main heat exchanger 24 are provided with a third exhaust gas discharge pipe 31.

[0023] This product also includes a liquid nitrogen storage tank 32, the top of which is provided with an inlet end of a supplementary gas delivery pipe 33, the vaporized nitrogen delivery pipe 19 and the supplementary gas delivery pipe 33 are respectively provided with a seventh regulating valve 41, the outlet end of the supplementary gas delivery pipe 33 is connected to the inlet end of the nitrogen booster pipe 21, a one-way valve 34 is provided on the nitrogen reflux pipe 25 between the main heat exchanger 24 and the nitrogen booster pipe 21, and the inlet ends of several liquid nitrogen delivery branches 16 are connected to the bottom of the liquid nitrogen storage tank 32. The first distillation device and the second distillation device also include first liquid level sensors 35 respectively provided on the cold source channel of the condenser 4 and the cold source channel of the evaporator 5; and second liquid level sensors 36 are respectively provided on the liquid nitrogen storage tank 32 and the temporary storage tank 9.

[0024] The process gas delivery pipe 7 is sequentially provided with a second pressure sensor 37 and a sixth regulating valve 38 along the direction from the first distillation device to the second distillation device, a third pressure sensor 39 is provided on the steam delivery pipe 11, and the steam delivery pipe 11 between the distillation tower 1 of the second distillation device and the third pressure sensor 39, the first product delivery pipe 8 and the second product delivery pipe 10 are respectively provided with an eighth regulating valve 40.

[0025] The usage of this product is as follows: Figure 1 and Figure 2 As shown, the following steps are included:

[0026] S1, the carbon monoxide raw gas with a concentration of about 99% transported out of the pressure swing adsorption device is transported to the raw gas transport pipe 6, and then transported to the distillation tower 1 of the first distillation device through the first heat source channel of the main heat exchanger 24 and the cold source continuously transported to the main heat exchanger 24 for heat exchange, and then transported to the distillation tower 1 of the first distillation device to form a first rising airflow, which continuously ascends along the inner cavity of the distillation tower 1 of the first distillation device, and continuously performs countercurrent heat exchange with the first reflux liquid which continuously descends along the inner cavity of the distillation tower 1 of the first distillation device. After the first rising airflow reaches the top of the distillation tower 1 of the first distillation device, it is continuously transported to the condensation of the first distillation device. After heat exchange with the medium in the heat source channel of the condenser 4 of the first distillation device and the cold source channel of the condenser 4, the first distillation device is liquefied and sent back to the top of the distillation tower 1 of the first distillation device to form the first reflux liquid; the first reflux liquid continues to descend along the distillation tower 1 of the first distillation device to the cold source channel of the evaporator 5 of the first distillation device and is continuously transported to the medium in the heat source channel of the evaporator 5 of the first distillation device to form a second rising airflow, and the second rising airflow continues to ascend along the inner cavity of the distillation tower 1 of the first distillation device to a preset height and merges into the first rising airflow.

[0027] S2. When the liquid level height of the cold source channel of the evaporator 5 of the first distillation device reaches a preset range, an impurity gas rich in argon is formed at the bottom of the distillation tower 1 of the first distillation device, and an intermediate gas of carbon monoxide from which argon is removed is formed at the top of the distillation tower 1 of the first distillation device. The carbon monoxide intermediate gas except argon is transported to the distillation tower 1 of the second distillation device to form a third rising airflow and continues to ascend along the inner cavity of the distillation tower 1 of the second distillation device, and continues to perform countercurrent heat exchange with the second reflux liquid that continues to descend along the inner cavity of the distillation tower 1 of the second distillation device. After the third rising airflow reaches the top of the distillation tower 1 of the second distillation device, it is continuously transported to the heat source channel of the condenser 4 of the second distillation device and the medium in the cold source channel of the condenser 4 of the second distillation device for heat exchange, and then is liquefied and sent back to the top of the distillation tower 1 of the second distillation device to form the second reflux liquid; the second reflux liquid continues to descend along the distillation tower 1 of the second distillation device to the cold source channel of the evaporator 5 of the second distillation device and is continuously transported to the medium in the heat source channel of the evaporator 5 of the second distillation device for heat exchange to form a fourth rising airflow, and the fourth rising airflow continues to ascend along the inner cavity of the distillation tower 1 of the second distillation device to a preset height and merges into the third rising airflow. Finally, a carbon monoxide liquid product is formed in the cold source channel of the condenser 4 of the second distillation device and is transported to the temporary storage tank 9 through the first product delivery pipe 8. The carbon monoxide gas formed by the evaporation of the carbon monoxide liquid product in the temporary storage tank 9 is sent back to the distillation tower 1 of the second distillation device and merged with the fourth rising air flow. After the liquid level height in the temporary storage tank 9 reaches a preset range, it is transported to the target user through the second product delivery pipe 10.

[0028] During step S2, the bottom of the distillation tower 1 of the first distillation device continuously transports the first impurity gas containing argon through the second waste gas discharge pipe 29; and the top gas delivery pipe 12 of the second distillation device continuously transports part of the gas containing nitrogen to form the second impurity gas; the first impurity gas and the second impurity gas are both transported to the third waste gas discharge pipe 31 to form the third impurity gas, and the third impurity gas is transported to the first cold source channel of the main heat exchanger 24 and continuously transported to the heat source medium of the main heat exchanger 24 for heat exchange, and then transported to the pressure swing adsorption device through the third waste gas discharge pipe 31 for pressure swing adsorption again to form new raw gas.

[0029] During step S1 and step S2, the inlet end of the nitrogen booster pipe 21 continuously receives nitrogen and is then heated by the recuperator 22 and compressed by the nitrogen compressor unit 23, and then sent to the second heat source channel of the main heat exchanger 24 and the cold source medium continuously sent to the main heat exchanger 24 for heat exchange and is divided into two parts, namely, a first part of nitrogen and a second part of nitrogen. The first part of nitrogen is sent to the heat source channel of the evaporator 5 of the first distillation device and the medium of the cold source channel of the evaporator 5 of the first distillation device is liquefied to form a first liquid nitrogen after heat exchange. The first liquid nitrogen is sent to the cold source channel of the condenser 4 of the first distillation device through the cold source delivery pipe 14 of the first distillation device; the second part of nitrogen is sent to the heat source channel of the evaporator 5 of the second distillation device and the medium of the cold source channel of the evaporator 5 of the second distillation device is liquefied to form a second liquid nitrogen after heat exchange. The second liquid nitrogen is sent to the heat source channel of the evaporator 5 of the second distillation device and the medium of the cold source channel of the evaporator 5 of the second distillation device is liquefied to form a second liquid nitrogen. The cold source delivery pipe 14 of the second distillation device is delivered to the cold source channel of the condenser 4 of the second distillation device; the second liquid nitrogen is vaporized to form a third part of nitrogen after heat exchange with the medium continuously delivered to the heat source channel of the condenser 4 of the second distillation device, the first liquid nitrogen is vaporized to form a fourth part of nitrogen after heat exchange with the medium continuously delivered to the heat source channel of the condenser 4 of the first distillation device, the third part of nitrogen is delivered to the nitrogen reflux pipe 25 through the vaporized nitrogen delivery pipe 19 of the second distillation device, the fourth part of nitrogen is combined with the third part of nitrogen entering the nitrogen reflux pipe 25 through the vaporized nitrogen delivery pipe 19 of the first distillation device to form a fifth part of nitrogen, which is delivered to the second cold source channel of the main heat exchanger 24 and the heat source medium continuously delivered to the main heat exchanger 24, and then delivered to the inlet end of the nitrogen booster pipe 21 through the outlet end of the nitrogen reflux pipe 25 to form a nitrogen cycle.

[0030] In the start-up phase before the above-mentioned circulation process, part of the liquid nitrogen stored in the liquid nitrogen storage tank 32 needs to be transported to the cold source channel of the condenser 4 of the first distillation device and the cold source channel of the condenser 4 of the second distillation device until the liquid level of the cold source channel of the condenser 4 of the first distillation device reaches the initial preset height and the liquid level of the cold source channel of the condenser 4 of the first distillation device reaches the initial preset height. The nitrogen generated by vaporization in the liquid nitrogen storage tank 32 is transported to the nitrogen booster pipe 21 through the supplementary gas delivery pipe 33 to participate in the above-mentioned nitrogen cycle, which also realizes the reasonable application of the nitrogen generated by vaporization of the liquid nitrogen stored in the liquid nitrogen storage tank 32.

[0031] Through this embodiment, the carbon monoxide gas with a concentration of 99% produced by the pressure swing adsorption method is used as a raw material and is successively distilled by the first distillation device and the second distillation device to produce a liquid carbon monoxide product.

[0032] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A carbon monoxide purification system, characterized in that: The invention comprises a first distillation device and a second distillation device, wherein the first distillation device and the second distillation device both comprise a distillation tower (1), a first packing layer (2) and a second packing layer (3) arranged in sequence from top to bottom in the distillation tower (1), a condenser (4) arranged at the top of the distillation tower (1), and a cold source channel of an evaporator (5) arranged at the bottom of the distillation tower (1) and connected to the inner cavity of the distillation tower (1); a raw gas delivery pipe (6) is arranged on the distillation tower (1) of the first distillation device, and the outlet end of the raw gas delivery pipe (6) is located between the first packing layer (2) and the second packing layer (3) of the first distillation device; and a condenser (4) is arranged at the top of the distillation tower (1) of the first distillation device. An inlet end of a process gas delivery pipe (7) is arranged, and an outlet end of the process gas delivery pipe (7) is connected to the distillation tower (1) of the second distillation device. The outlet end of the process gas delivery pipe (7) is located between the first packing layer (2) and the second packing layer (3) of the second distillation device. A first product delivery pipe (8) is arranged on the evaporator (5) of the second distillation device. A temporary storage tank (9) is arranged on the first product delivery pipe (8). A second product delivery pipe (10) is arranged on the bottom of the temporary storage tank (9). An inlet end of a steam delivery pipe (11) is arranged on the top of the temporary storage tank (9). The outlet end of the steam delivery pipe (11) is connected to the bottom of the distillation tower (1) of the second distillation device.

2. The carbon monoxide purification system according to claim 1, characterized in that: The first distillation device and the second distillation device further comprise a tower top gas delivery pipe (12) arranged at the top of the distillation tower (1) and the inlet end of the heat source channel of the condenser (4), a reflux liquid delivery pipe (13) arranged at the top of the distillation tower (1) and the outlet end of the heat source channel of the condenser (4), a cold source delivery pipe (14) arranged at the outlet end of the heat source channel of the evaporator (5) and the cold source channel of the condenser (4), a first regulating valve (15) and the outlet end of the liquid nitrogen delivery branch pipe (16) arranged in sequence on the cold source delivery pipe (14) along the direction from the condenser (4) to the evaporator (5), and a second regulating valve (17) respectively arranged on the liquid nitrogen delivery branch pipe (16) and the reflux liquid delivery pipe (13).

3. The carbon monoxide purification system according to claim 2, characterized in that: The first distillation device and the second distillation device further comprise an outlet end of a pressure nitrogen gas delivery branch pipe (18) arranged at the inlet end of the heat source channel of the evaporator (5), an inlet end of a vaporized nitrogen gas delivery pipe (19) arranged at the top end of the cold source channel of the condenser (4), and a third regulating valve (20) respectively arranged on the vaporized nitrogen gas delivery pipe (19) and the pressure nitrogen gas delivery branch pipe (18); outlet ends of nitrogen boosting pipes (21) are arranged at the inlet ends of the plurality of pressure nitrogen gas delivery branch pipes (18), and the nitrogen boosting pipes (21) extend along a path away from the pressure nitrogen gas delivery channel. A reheater (22), a nitrogen compressor unit (23) and a main heat exchanger (24) are sequentially arranged from the delivery branch pipe (18) to the direction close to the pressure nitrogen delivery branch pipe (18); a plurality of vaporized nitrogen delivery pipes (19) and the main heat exchanger (24) are provided with nitrogen return pipes (25); the outlet ends of the plurality of vaporized nitrogen delivery pipes (19) are all connected to the inlet end of the nitrogen return pipe (25); some of the nitrogen return pipes (25) are installed on the main heat exchanger (24); and the outlet end of the nitrogen return pipe (25) is connected to the inlet end of the nitrogen booster pipe (21).

4. The carbon monoxide purification system according to claim 3, characterized in that: Part of the raw gas delivery pipe (6) is installed on the main heat exchanger (24); a first pressure sensor (26), an inlet end of a first exhaust gas discharge pipe (27) and a fourth regulating valve (28) are sequentially arranged on the top gas delivery pipe (12) of the second distillation device along the direction from the distillation tower (1) of the second distillation device to the condenser (4) of the second distillation device; an inlet end of a second exhaust gas discharge pipe (29) is arranged on the bottom of the distillation tower (1) of the first distillation device; a fifth regulating valve (30) is respectively arranged on the first exhaust gas discharge pipe (27) and the second exhaust gas discharge pipe (29); and a third exhaust gas discharge pipe (31) is arranged at the outlet end of the first exhaust gas discharge pipe (27), the outlet end of the second exhaust gas discharge pipe (29) and the main heat exchanger (24).

5. The carbon monoxide purification system according to claim 3, characterized in that: The invention also comprises a liquid nitrogen storage tank (32), wherein the top of the liquid nitrogen storage tank (32) is provided with an inlet end of a supplementary gas delivery pipe (33), the vaporized nitrogen delivery pipe (19) and the supplementary gas delivery pipe (33) are respectively provided with a seventh regulating valve (41), the outlet end of the supplementary gas delivery pipe (33) is connected to the inlet end of the nitrogen booster pipe (21), a one-way valve (34) is provided on the nitrogen reflux pipe (25) between the main heat exchanger (24) and the nitrogen booster pipe (21), and the inlet ends of a plurality of liquid nitrogen delivery branch pipes (16) are all connected to the bottom of the liquid nitrogen storage tank (32).

6. The carbon monoxide purification system according to claim 5, characterized in that: The first distillation device and the second distillation device further include first liquid level sensors (35) respectively arranged on the cold source channel of the condenser (4) and the cold source channel of the evaporator (5); and second liquid level sensors (36) are respectively arranged on the liquid nitrogen storage tank (32) and the temporary storage tank (9).

7. The carbon monoxide purification system according to claim 1, characterized in that: The process gas delivery pipe (7) is provided with a second pressure sensor (37) and a sixth regulating valve (38) in sequence along the direction from the first distillation device to the second distillation device, and the first product delivery pipe (8) and the second product delivery pipe (10) are each provided with an eighth regulating valve (40).

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