A carbon dioxide molten salt electrolysis experimental device

Abstract

The invention discloses a carbon dioxide molten salt electrolysis experimental device, comprising a carbon dioxide gas cylinder, a sealed electrolysis device and a gas collection device, wherein the sealed electrolysis device comprises a high temperature resistant stainless steel crucible, a graphite electrolytic cell, an anode, a cathode and a direct current power supply, wherein the high temperature resistant stainless steel crucible comprises a crucible body and a crucible cover, wherein the crucible cover is sealed and closed on the crucible body, wherein a graphite electrolytic cell is arranged in the crucible body, an air inlet joint and an air outlet joint are arranged on the crucible cover, wherein the outlet of the carbon dioxide gas cylinder is connected to the air inlet joint via a vent pipe, an extension pipe extending downwardly and connected to the air inlet joint is arranged at the bottom of the crucible cover, a direct current power supply is arranged above the crucible cover, an anode and a cathode are connected to the direct current power supply via a guide rod on the one hand, and are suspended through the crucible cover and extended into the molten salt electrolyte via a guide rod seal on the other hand, a gas collecting hood for covering the anode is arranged in the crucible body, and an exhaust pipe is arranged on the top of the gas collecting hood. The invention has the advantages of simple structure, easy assembly, good air tightness, and can effectively collect high purity oxygen.

Description

Technical Field

[0001] The invention relates to a carbon dioxide molten salt electrolysis experimental device, in particular to an experimental device for preparing oxygen by electrolyzing carbon dioxide and capable of collecting anode gas products. Background Art

[0002] The rapid development of industry has led to an increasing demand for energy. The use of fossil fuels such as coal, oil and natural gas has provided a large amount of energy for modern industrial and social development, while also emitting a large amount of carbon dioxide. As the main greenhouse gas, how to utilize carbon dioxide as a resource is crucial. Carbon dioxide is composed of carbon atoms and oxygen atoms. Decomposing carbon dioxide into carbon and oxygen is undoubtedly the best choice, but carbon dioxide is highly stable and generally difficult to decompose. Molten salt electrochemical technology uses electrons as energy mesons. Through molten salt electrochemical technology, electrons can be used as energy carriers to effectively decompose carbon dioxide to produce oxygen. However, it is difficult to ensure airtightness of existing experimental devices at high temperatures, and it is difficult to collect high-purity oxygen. Summary of the invention

[0003] The purpose of the present invention is to provide a carbon dioxide molten salt electrolysis experimental device to address the deficiencies of the above-mentioned prior art.

[0004] The technical solution of the present invention:

[0005] A carbon dioxide molten salt electrolysis experimental device comprises a carbon dioxide gas cylinder, a sealed electrolysis device and a gas collecting device, wherein the sealed electrolysis device comprises a high-temperature resistant stainless steel crucible, a graphite electrolytic cell, an anode, a cathode and a direct current power supply, wherein the high-temperature resistant stainless steel crucible comprises a crucible body and a crucible cover, the crucible cover is sealed and closed on the crucible body, a graphite electrolytic cell is arranged in the crucible body, a molten salt electrolyte is arranged in the graphite electrolytic cell, an air inlet joint and an air outlet joint are arranged on the crucible cover, the outlet of the carbon dioxide gas cylinder is connected to the air inlet joint via a vent pipe, an extension pipe extending downward and connected to the air inlet joint is arranged at the bottom of the crucible cover, the direct current power supply is arranged above the crucible cover, the anode and the cathode are respectively connected to the direct current power supply via a guide rod, the anode and the cathode are respectively sealed through the crucible cover and suspended and extended into the molten salt electrolyte via the guide rod, a gas collecting hood for covering the anode is arranged in the crucible body, the lower part of the gas collecting hood extends into the molten salt electrolyte, an exhaust pipe corresponding to the air outlet joint is detachably installed on the top of the gas collecting hood, and the air outlet joint is connected to the gas collecting device via the gas collecting pipe.

[0006] Preferably, a corundum tube is detachably mounted on the bottom of the crucible cover for the anode guide rod to pass through and is used to insulate the anode guide rod from the gas collecting cover.

[0007] Preferably, two threaded holes are formed on the top of the anode cover, and both ends of the exhaust pipe and the corundum tube are respectively provided with threads; the upper end of the exhaust pipe is screwed to the crucible cover, and the lower end is screwed to the anode cover, and the screw connection is sealed with a high-temperature resistant stainless steel sealing ring; the upper end of the corundum tube is screwed to the crucible cover, and the lower end is screwed to the anode cover, and the screw connection is sealed with a high-temperature resistant stainless steel sealing ring.

[0008] Preferably, the crucible cover is provided with a cathode penetration joint for the cathode guide rod to pass through and an anode penetration joint for the anode guide rod to pass through a corresponding corundum tube, the air inlet joint, air outlet joint, cathode penetration joint and anode penetration joint are all made of high-temperature resistant stainless steel threaded pipe joints, and the connection between the vent pipe and the air inlet joint, the connection between the gas collecting pipe and the air outlet joint, the cathode penetration joint and the cathode guide rod, and the anode penetration joint and the anode guide rod are respectively connected and sealed by clamps and sealing rings.

[0009] Preferably, the gas collecting device includes an air guide pipe, a gas collecting bottle, a gas collecting bottle bracket and a water tank. The gas collecting bottle is mounted in the water tank through the gas collecting bottle bracket. One end of the air collecting pipe is connected to the gas outlet joint, and the other end of the air collecting pipe is connected to the air guide pipe. One end of the air guide pipe extends into the gas collecting bottle.

[0010] Preferably, the gas collecting device further comprises a condenser, and the condenser is arranged between the gas collecting pipe and the gas guiding pipe.

[0011] Preferably, the outlet of the carbon dioxide cylinder is provided with a control valve, and the ventilation pipe is provided with a gas flow meter.

[0012] Preferably, the anode is a platinum electrode and the cathode is a titanium electrode.

[0013] Preferably, the crucible cover and the crucible body are sealed by a metal sealing ring, and the crucible cover and the crucible body are fixed by bolts.

[0014] The beneficial effects of the present invention are:

[0015] 1. The experimental device of the present invention has a simple structure and is easy to assemble. The carbon dioxide electrolysis experimental process is simple to operate, safe and reliable.

[0016] 2. The anode cover is provided to improve the collection efficiency of the anode gas. The corundum tube can prevent short circuits on the one hand, and avoid the anode guide rod causing the entire gas collecting cover to act as an anode for electrolysis reaction. On the other hand, the anode cover can be installed more stably.

[0017] 3. Good air tightness and high gas purity. It can effectively collect the oxygen produced on the inert anode. The gas flow rate can be easily controlled by setting a gas flow meter.

[0018] 4. A condenser is installed between the gas collecting pipe and the gas guide pipe; it can cool the gas and prevent the operator from getting burned due to the high temperature in the gas collecting bottle when touching it. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the sealing structure of the anode guide rod in an embodiment of the present invention;

[0021] Figure 3 is a top view of the anode guide rod sealing structure in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the sealing structure of the gas collecting pipe in an embodiment of the present invention;

[0023] In the figure: carbon dioxide gas cylinder 1, control gas valve 2, gas flowmeter 3, ventilation pipe 4, extension pipe 5, DC power supply 6, corundum tube 7, crucible cover 8, molten salt electrolyte 9, cathode 10, graphite electrolytic cell 11, anode 12, crucible body 13, gas collecting hood 14, metal sealing ring sheet 15, bolt 16, clamp 17, condenser 18, gas guide pipe 19, gas collecting bottle 20, gas collecting bottle bracket 21, water tank 22, exhaust pipe 23, gas collecting pipe 24, high temperature resistant insulating sealing ring 25, sealing copper sheet 26, bolt 27, high temperature resistant stainless steel clamp joint 28, air inlet joint 81, air outlet joint 82, cathode penetration joint 83, anode penetration joint 84, cathode guide rod 100, anode guide rod 200. DETAILED DESCRIPTION

[0024] The present invention can be further described by the following embodiments. However, the scope of the present invention is not limited to the following embodiments.

[0025] Example 1: See Figure 1A carbon dioxide molten salt electrolysis experimental device shown in the figure comprises a carbon dioxide gas cylinder 1, a sealed electrolysis device and a gas collection device, wherein the sealed electrolysis device comprises a high temperature resistant stainless steel crucible, a graphite electrolytic cell 11, an anode 12, a cathode 10 and a DC power supply 6, wherein the anode 12 is a platinum electrode, the cathode 10 is a titanium electrode, the high temperature resistant stainless steel crucible comprises a crucible body 13 and a crucible cover 8, the crucible cover 8 is sealed and covered on the crucible body 13, a graphite electrolytic cell 11 is arranged in the crucible body 13, a molten salt electrolyte 9 is arranged in the graphite electrolytic cell 11, an air inlet connector 81 and an air outlet connector 82 are arranged on the crucible cover 8, and the outlet of the carbon dioxide gas cylinder 1 is connected to the air inlet connector 81 through a vent pipe 4 The bottom of the crucible cover 8 is provided with an extension tube 5 extending downward to connect to the air inlet connector 81, the DC power supply 6 is arranged above the crucible cover 8, the anode 12 and the cathode 10 are respectively connected to the DC power supply 6 through a guide rod, the voltage adjustment parameter of the DC power supply 6 is: 0-15V, the anode 12 and the cathode 10 are respectively sealed through the crucible cover 8 and suspended and extended into the molten salt electrolyte 9, the crucible body 13 is provided with a gas collecting hood 14 for covering the anode 12, the lower part of the gas collecting hood 14 extends into the molten salt electrolyte 9, and the top of the gas collecting hood 14 is detachably installed with an exhaust pipe 23 corresponding to the gas outlet connector 82, and the gas outlet connector 82 is connected to the gas collection device through the gas collecting pipe 24.

[0026] Preferably, the bottom of the crucible cover 8 is detachably mounted with a corundum tube 7 for the anode guide rod 200 to pass through and for insulating the anode guide rod 200 from the gas collecting cover 14. Preferably, the top of the anode cover 14 is provided with two threaded holes, and both ends of the exhaust pipe 23 and the corundum tube 7 are respectively provided with threads; the upper end of the exhaust pipe 23 is screwed to the crucible cover 8, and the lower end is screwed to the anode cover 14, and the screw connection is sealed with a high-temperature resistant stainless steel sealing ring; the upper end of the corundum tube 7 is screwed to the crucible cover 8, and the lower end is screwed to the anode cover 14, and the screw connection is sealed with a high-temperature resistant stainless steel sealing ring. By arranging the corundum tube 7, on the one hand, short circuit can be prevented to avoid the anode guide rod causing the entire gas collecting cover to act as an anode for electrolysis reaction, and on the other hand, the installation of the anode cover 14 can be made more stable.

[0027] Preferably, the crucible cover 8 is provided with a cathode penetration joint 83 for the cathode guide rod 100 to pass through and an anode penetration joint 84 for the anode guide rod 200 to pass through the corresponding corundum tube 7, the air inlet joint 81, the air outlet joint 82, the cathode penetration joint 83, and the anode penetration joint 84 are all made of high-temperature resistant stainless steel threaded pipe joints, and the connection between the vent pipe 4 and the air inlet joint 81, the connection between the gas collecting pipe 24 and the air outlet joint 82, the cathode penetration joint 83 and the cathode guide rod 100, and the anode penetration joint 84 and the anode guide rod 200 are respectively connected and sealed by a clamp 17 and a sealing ring.

[0028] In this embodiment, the sealing structure of the cathode guide rod 100 is the same as the sealing structure of the anode guide rod 200. Figure 2and Figure 3 As shown in the figure, it includes a clamp 17, a high temperature resistant insulating sealing ring 25, a sealing copper sheet 26, an anode penetration joint 84 and an anode guide rod 200. The high temperature resistant insulating sealing ring 25 is sealed on the anode guide rod 200. The high temperature resistant insulating sealing ring 25 and the anode penetration joint 84 are sealed with a sealing copper sheet 26. The anode penetration joint 84 and the high temperature resistant insulating sealing ring 25 are tightly sealed by the clamp 17. The bolt 27 that tightens the clamp is rotated to ensure the air tightness of the device.

[0029] In this embodiment, the sealing structure of the vent pipe 4 is the same as the sealing structure of the gas collecting pipe 24. Figure 4 As shown in the figure, it includes a clamp 17, a high-temperature resistant stainless steel clamp joint 28, a sealing copper sheet 26, an air outlet joint 82 and a gas collecting pipe 24. The high-temperature resistant stainless steel clamp joint 28 is sealed on the inlet end of the gas collecting pipe 24. The high-temperature resistant stainless steel clamp joint 28 and the air outlet joint 82 are sealed with a sealing copper sheet 26. The anode penetration joint 84 and the high-temperature resistant stainless steel clamp joint 28 are sealed by the clamp 17. By rotating and tightening the bolt 27 of the clamp, the sealing of the air outlet joint 82 and the gas collecting pipe 24 is ensured.

[0030] Preferably, the gas collecting device includes an air duct 19, a gas collecting bottle 20, a gas collecting bottle bracket 21 and a water tank 22. The gas collecting bottle 20 is mounted in the water tank 22 through the gas collecting bottle bracket 21. One end of the air collecting pipe 24 is connected to the gas outlet joint 82. The other end of the air collecting pipe 24 is connected to the air duct 19. One end of the air duct 19 extends into the gas collecting bottle 20. Preferably, the gas collecting device also includes a condenser 18, which is arranged between the air collecting pipe 24 and the air duct 19. Since the temperature of the gas generated by the anode reaction is very high, the condenser can be arranged to cool the gas, thereby avoiding burns caused by the high temperature in the gas collecting bottle when the operator touches the gas collecting bottle.

[0031] It is further preferred that the cooling water inlet of the condenser 18 is located at the right end, and the water outlet is located at the left end. Cold water flows in from the end close to the gas collecting bottle 20 and flows out from the end close to the gas collecting hood 14. There will be a buffering process, which can prevent the cooling water from directly exchanging heat with the high-temperature gas at the end of the gas collecting pipe 24 for a long time, thereby reducing the risk of the condenser 18 bursting.

[0032] Preferably, the outlet of the carbon dioxide cylinder 1 is provided with a control valve 2, and the ventilation pipe 4 is provided with a gas flow meter 3, the gas flow meter model: LZB-3WB, flow range: 0.25-2.5m 3 / h.

[0033] Preferably, the crucible cover 8 and the crucible body 13 are sealed by a metal sealing ring sheet 15 , and the crucible cover 8 and the crucible body 13 are fixed by bolts 16 .

[0034] Before the experiment of the present invention, the gas collecting hood 14 and the corundum tube 7 need to be assembled. Two threaded holes of appropriate size are opened on the top of the gas collecting hood 14 for connecting with the exhaust pipe 23 and the corundum tube 7. The upper end of the exhaust pipe 23 is connected to the stainless steel crucible cover 8. The connection between the components is connected by screw connection and sealed with a high-temperature resistant stainless steel sealing ring. The finished gas collecting hood 14 has good sealing performance. The exhaust pipe 23 is made of high-temperature resistant stainless steel. The anode guide rod 200 is insulated from the gas collecting hood 14 by the corundum tube 7.

[0035] Experimental process: LiCl: Li2O is prepared with a mass ratio of 95:5, mixed evenly, and then loaded into a graphite electrolytic cell 11, covered with a stainless steel crucible cover 8, and the control gas valve 2 is opened. Carbon dioxide gas enters the crucible body 13 through a gas flow meter 3, a vent pipe 4, and an extension pipe 5. At the same time, a DC power supply 6 is turned on to energize the platinum and titanium electrodes, and a chemical reaction occurs between the positive and negative electrodes. The reaction process includes but is not limited to the following chemical formula:

[0036] Carbon dioxide absorption reaction: CO2 + O 2− = CO3 2−

[0037] The electrode reaction occurring on the platinum electrode is: CO3 2− − 2e − = CO2 + 0.5O2

[0038] O 2− − 2e − = 0.5O2

[0039] The electrode reaction occurring on the titanium electrode is: CO3 2− +4e − = C + 3O 2−

[0040] The gas generated on the platinum electrode enters the gas collecting pipe 24, the condenser 18 and the gas guide pipe 19 in sequence through the exhaust pipe 23 under the action of the gas collecting hood 14, and is finally collected by the gas collecting bottle 20. Cooling water can be introduced into the condenser 18 to cool the gas generated by the anode reaction to avoid burns caused by the high temperature in the gas collecting bottle when the operator touches the gas collecting bottle. During the experiment, the gas flow rate of the control valve can be adjusted by observing the amount of collected gas generated. When the water in the gas collecting bottle is drained, it means that the collection is completed.

[0041] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A carbon dioxide molten salt electrolysis experimental device, characterized in that: The invention comprises a carbon dioxide gas cylinder, a sealed electrolysis device and a gas collecting device, wherein the sealed electrolysis device comprises a high-temperature resistant stainless steel crucible, a graphite electrolytic cell, an anode, a cathode and a DC power supply, wherein the high-temperature resistant stainless steel crucible comprises a crucible body and a crucible cover, the crucible cover is sealed on the crucible body, a graphite electrolytic cell is arranged in the crucible body, a molten salt electrolyte is arranged in the graphite electrolytic cell, and an air inlet joint and an air outlet joint are arranged on the crucible cover. The outlet of the carbon dioxide gas cylinder is connected to the air inlet joint through a vent pipe, and an extension pipe extending downward and connected to the air inlet joint is provided at the bottom of the crucible cover. The DC power supply is arranged above the crucible cover, the anode and the cathode are respectively connected to the DC power supply through guide rods, the anode and the cathode are respectively suspended through the crucible cover through the guide rod seal and extend into the molten salt electrolyte, The crucible is provided with a gas collecting hood for covering the anode, the lower part of the gas collecting hood extends into the molten salt electrolyte, the top of the gas collecting hood is detachably provided with an exhaust pipe corresponding to a gas outlet joint, and the gas outlet joint is connected to a gas collecting device through a gas collecting pipe.

2. A carbon dioxide molten salt electrolysis experimental device according to claim 1, characterized in that: The bottom of the crucible cover is detachably provided with a corundum tube for the anode guide rod to pass through and for insulating the anode guide rod from the gas collecting cover.

3. A carbon dioxide molten salt electrolysis experimental device according to claim 2, characterized in that: There are two threaded holes on the top of the anode cover, and both ends of the exhaust pipe and the corundum tube are respectively provided with threads; the upper end of the exhaust pipe is screwed to the crucible cover, and the lower end is screwed to the anode cover, and the screw connection is sealed with a high-temperature resistant stainless steel sealing ring; the upper end of the corundum tube is screwed to the crucible cover, and the lower end is screwed to the anode cover, and the screw connection is sealed with a high-temperature resistant stainless steel sealing ring.

4. A carbon dioxide molten salt electrolysis experimental device according to claim 3, characterized in that: The crucible cover is provided with a cathode penetration joint for the cathode guide rod to pass through and an anode penetration joint for the anode guide rod to pass through a corresponding corundum tube. The air inlet joint, air outlet joint, cathode penetration joint and anode penetration joint are all made of high-temperature resistant stainless steel threaded pipe joints. The connection between the vent pipe and the air inlet joint, the connection between the gas collecting pipe and the air outlet joint, the cathode penetration joint and the cathode guide rod, and the anode penetration joint and the anode guide rod are respectively connected and sealed by clamps and sealing rings.

5. The carbon dioxide molten salt electrolysis experimental device according to claim 1, characterized in that: The gas collecting device includes an air guide pipe, a gas collecting bottle, a gas collecting bottle bracket and a water tank. The gas collecting bottle is mounted in the water tank through the gas collecting bottle bracket. One end of the air collecting pipe is connected to the gas outlet joint, and the other end of the air collecting pipe is connected to the air guide pipe. One end of the air guide pipe extends into the gas collecting bottle.

6. A carbon dioxide molten salt electrolysis experimental device according to claim 5, characterized in that: The gas collecting device further comprises a condenser, and the condenser is arranged between the gas collecting pipe and the gas guiding pipe.

7. The carbon dioxide molten salt electrolysis experimental device according to claim 1, characterized in that: The outlet of the carbon dioxide gas cylinder is provided with a control gas valve, and the ventilation pipe is provided with a gas flow meter.

8. The carbon dioxide molten salt electrolysis experimental device according to claim 1, characterized in that: The anode is a platinum electrode, and the cathode is a titanium electrode.

9. The carbon dioxide molten salt electrolysis experimental device according to claim 1, characterized in that: The crucible cover and the crucible body are sealed by a metal sealing ring, and the crucible cover and the crucible body are fixed by bolts.

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