Carbon dioxide trapping device for high-temperature calcination of calcium carbonate coupled with water electrolysis hydrogen production

Abstract

The utility model provides a carbon dioxide trapping device for calcium carbonate high-temperature calcination coupled water electrolysis hydrogen production, and aims to calcine calcium carbonate, trap carbon dioxide, fully recover heat and reduce energy loss. The device comprises a calcining furnace, a first dust settling chamber, a compressor, a steam turbine, a cooler, a second dust settling chamber, a steam turbine generator, a power supply, an electrolyzed water unit, a gas-liquid separator, a storage tank and a control unit. In the process that calcium carbonate is calcined to generate limestone, high-temperature CO2 gas can be generated, after the device compresses the high-temperature CO2 gas, heat can be fully utilized, and the high-temperature and high-pressure CO2 gas can be used for pushing a steam turbine to rotate, converting heat energy into mechanical energy and supplying power to an electrolyzed water unit, so that the electrolyzed water unit generates hydrogen and oxygen with high additional values. Meanwhile, the water electrolysis unit can further purify CO2 gas in one step.

Description

TECHNICAL FIELD

[0001] The utility model belongs to carbon dioxide gas capture technical field, concretely relates to a kind of carbon dioxide capture device of calcium carbonate high-temperature calcination coupling water electrolysis hydrogen production. BACKGROUND

[0002] Calcium carbonate (CaCO3), magnesium carbonate (MgCO3) and other carbonates are indispensable solvents, stabilizers and raw materials in cement and steel production industries. These carbonates are calcined and thermally decomposed at high temperatures to form corresponding metal oxides, which are used in various downstream industries. However, the calcination process not only consumes a tremendous amount of energy, with most of the heat being difficult to recover and reuse, but also results in a large amount of carbon dioxide (CO2) being emitted on-site, posing a serious challenge to environmental protection.

[0003] CO2 is the largest contributor to greenhouse gas emissions, accounting for more than 70% of global emissions. In order to reduce such emissions and meet environmental regulations, various carbon dioxide capture technologies have been widely researched and applied, but there is currently no comprehensive equipment that combines heat recovery.

[0004] In view of this, the utility model develops a new carbon dioxide capture device. SUMMARY

[0005] The utility model provides a kind of carbon dioxide capture device of calcium carbonate high-temperature calcination coupling water electrolysis hydrogen production, it aims at calcining calcium carbonate, not only can capture carbon dioxide but also can fully recover heat, reduce energy loss.

[0006] To achieve the above-mentioned purposes, the technical solutions provided by the utility model are as follows:

[0007] A carbon dioxide capture device for calcium carbonate high-temperature calcination coupling water electrolysis hydrogen production, characterized by comprising a calcination furnace, a first dust falling chamber, a compressor, a steam turbine, a cooler, a second dust falling chamber, a steam turbine generator, a power source, a water electrolysis unit, a gas-liquid separator, a storage tank and a control unit.

[0008] The calcination furnace is used for calcining calcium carbonate and includes a main furnace body, a flue and a combustion material tank arranged in the main furnace body. The combustion material tank is placed in the flue, with a calcium carbonate feed inlet and a carbon dioxide gas outlet at the top and a solid product collection hopper at the bottom. The main furnace body side is provided with a preheated air duct, a fire observation hole and a temperature measurement hole.

[0009] The electrolytic water unit comprises an electrolytic bin, a cathode electrolytic rod, an anode electrolytic rod, an anion exchange film and a cation exchange film; the electrolytic bin is sequentially divided into a cathode tank, a solution tank and an anode tank from one side to the other side by the anion exchange film and the cation exchange film; the cathode electrolytic rod is arranged in the cathode tank, and a first outlet is arranged at the bottom of the cathode tank; the anode electrolytic rod is arranged in the anode tank, and a second outlet is arranged at the bottom of the anode tank; a hydrogen discharge pipe is arranged on the upper part of the wall surface of the electrolytic bin close to the cathode tank, and a hydrogen storage tank is connected to the hydrogen discharge pipe; a first liquid supply pipe and a carbon dioxide inlet are arranged on the lower part of the wall surface of the electrolytic bin; an oxygen discharge pipe is arranged on the upper part of the wall surface of the electrolytic bin close to the anode tank, and an oxygen storage tank is connected to the oxygen discharge pipe; the first liquid supply pipe and the second liquid supply pipe are used to supply potassium nitrate solution to the electrolytic bin; the first outlet and the second outlet are in communication with the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is in communication with the carbon dioxide storage tank; when the electrolytic potassium nitrate is electrolyzed, the cathode generates hydrogen gas and OH - at the same time, and the anode generates oxygen gas and H + at the same time.

[0010] The carbon dioxide outlet of the combustion tank is in communication with the gas inlet of the first dust removal chamber; the first dust removal chamber, the compressor, the steam turbine, the cooler and the second dust removal chamber are sequentially connected in the direction of carbon dioxide gas flow; the gas outlet of the second dust removal chamber is in communication with the carbon dioxide inlet of the electrolytic bin; and the steam turbine is also connected with the steam turbine generator, the steam turbine generator is connected with the power supply, and the power supply is connected with the cathode electrolytic rod and the anode electrolytic rod; wherein, the first dust removal chamber and the second dust removal chamber are arranged to remove dust in the gas entering the next device, so as to avoid adverse effects on the device.

[0011] The control unit is used to control the working state of each component in the carbon dioxide capture device.

[0012] The high-temperature carbon dioxide generated by calcining calcium carbonate in the calcining furnace flows through the first dust removal chamber, the compressor, the steam turbine, the cooler and the second dust removal chamber in sequence, and then enters the carbon dioxide inlet of the electrolytic bin; the carbon dioxide gas is dissolved in the alkaline solution in the cathode tank after electrolysis; the alkaline solution and the acidic solution in the anode tank after electrolysis enter the gas-liquid separator through the first outlet and the second outlet respectively to separate the gas and the liquid; specifically, the alkaline solution and the acidic solution in the gas-liquid separator undergo acid-base neutralization reaction to release heat, so that CO2 gas is precipitated, and finally stored in the carbon dioxide storage tank.

[0013] Further, two combustion tanks are arranged in the main furnace body.

[0014] Further, the solid product collecting hopper is a reverse frustum type.

[0015] The utility model discloses a kind of carbon dioxide capture devices for calcium carbonate high-temperature calcination coupling electrolysis water hydrogen production, and the structure is shown in the figure.

[0016] 1.The utility model discloses a calcium carbonate high-temperature calcination coupling electrolysis water carbon dioxide capture device, which can capture and recycle carbon dioxide by coupling high-temperature calcination of calcium carbonate and electrolysis of water. During the process of calcining calcium carbonate to produce limestone, high-temperature CO2 gas is generated. The device compresses the high-temperature CO2 gas, which not only fully utilizes the heat, but also uses the high-temperature and high-pressure CO2 gas to drive the rotation of a steam turbine, converts the heat energy into mechanical energy, and supplies power to the electrolysis water unit to produce hydrogen and oxygen with high added value. At the same time, the electrolysis water unit can also purify CO2 gas in one step (first, CO2 gas is dissolved in an alkaline solution, and then, after acid-base neutralization, cleaner CO2 gas is obtained). Therefore, the device improves energy utilization efficiency, purifies CO2 gas generated by calcining carbonate, and produces oxygen and hydrogen with high added value, which has the advantages of killing two birds with one stone.

[0017] 2.The utility model makes full use of the potential of solution change in the existing electrolysis water process to purify CO2 gas and improve the quality of carbon dioxide capture. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural schematic diagram of the carbon dioxide capture device for calcium carbonate high-temperature calcination coupling electrolysis water hydrogen production according to the utility model.

[0019] The reference signs are as follows:

[0020] 1 - calcining furnace, 11 - first feeding port, 12 - second feeding port, 13 - flue, 14 - combustion tank, 15 - preheating air duct, 16 - fire hole, 17 - temperature measuring hole, 18 - solid collecting hopper, 19 - carbon dioxide gas outlet, 2 - first dust falling chamber, 3 - steam turbine, 4 - cooler, 5 - second dust falling chamber, 6 - power supply, 7 - electrolysis bin, 71 - cathode electrolysis rod, 72 - cation permeable membrane, 73 - anion permeable membrane, 74 - anode electrolysis rod, 75 - hydrogen discharge pipe, 76 - oxygen discharge pipe, 77 - first solution discharge pipe, 78 - second solution discharge pipe, 79 - cathode tank, 791 - solution tank, 792 - anode tank, 793 - first liquid supply pipe, 794 - second liquid supply pipe, 8 - gas-liquid separator, 9 - carbon dioxide storage tank, 20 - steam turbine generator, 21 - compressor. DETAILED DESCRIPTION

[0021] The content of the utility model is further described in detail below in combination with the drawings and specific embodiments:

[0022] Figure 1The application discloses a carbon dioxide capturing device for coupling high-temperature calcination of calcium carbonate with water electrolysis to prepare hydrogen, and has the special structure that the device comprises a calcination furnace, a first dust falling chamber, a compressor, a steam turbine, a cooler, a second dust falling chamber, a steam turbine generator, a power supply, a water electrolysis unit, a gas-liquid separator, a storage tank and a control unit.

[0023] The calcination furnace is used for calcining calcium carbonate and comprises a main furnace body and a flue and two combustion material tanks arranged in the main furnace body.

[0024] The water electrolysis unit comprises an electrolysis bin, a cathode electrolysis rod, an anode electrolysis rod, a negative ion exchange film and a positive ion exchange film. - + The two combustion material tanks are arranged side by side in the flue, and the top of each combustion material tank is provided with a calcium carbonate feeding port (a first feeding port and a second feeding port respectively) and a carbon dioxide gas outlet, and the bottom of each combustion material tank is provided with a solid product collecting hopper in the shape of an inverted truncated cone.

[0025] The bottom of the cathode electrolysis tank is provided with a first outlet, and the bottom of the anode electrolysis tank is provided with a second outlet.

[0026] The control unit is used for controlling the working states of the components in the carbon dioxide capturing device.

[0027] ​The high-temperature carbon dioxide generated by calcining calcium carbonate in the calcining furnace flows through the first dust falling chamber through the carbon dioxide outlet, and becomes high-temperature and high-pressure gas after dust falling and pressure rising, and enters the steam turbine to drive the rotation of the steam turbine, and converts heat energy into mechanical energy to drive the steam generator to generate electricity to supply power, and further supply power to the anode electrolysis rod and the cathode electrolysis rod; and the carbon dioxide gas flows through the steam turbine, and then flows through the cooler and the second dust falling chamber in sequence to reduce the temperature and dust, and then enters the carbon dioxide inlet of the electrolysis bin, and is dissolved in the alkaline solution in the cathode tank after electrolysis; the alkaline solution and the acidic solution in the anode tank after electrolysis enter the gas-liquid separator through the first outlet and the second outlet respectively to separate the gas and the liquid, specifically, the alkaline solution and the acidic solution in the gas-liquid separator undergo acid-base neutralization reaction to release heat, and CO2 gas is separated, and finally stored in the carbon dioxide storage tank.

[0028] The working process of the above device is as follows:

[0029] The calcium carbonate enters the two combustion material tanks 14 of the calcining furnace through the first feeding port 11 and the second feeding port 12 respectively; the air enters the calcining furnace 1 through the preheating air channel 15, and the fire channel 13 in the calcining furnace 1 heats the combustion material tank 14; after calcination is completed, the calcium oxide enters the solid collection hopper 18, and the high-temperature CO2 gas flows out from the carbon dioxide outlet 19 of the calcining furnace to enter the first dust falling chamber 2 to preliminarily remove dust from the CO2 gas, and then becomes high-temperature and high-pressure CO2 gas after being pressurized by the compressor 21 to enter the steam turbine 3 to drive the rotation of the steam turbine, and further drive the steam generator 10 to generate electricity to provide electric energy for the power source 6; the CO2 gas enters the cooler 4 after the steam turbine 3 to cool the gas, and then further removes dust in the second dust falling chamber 5 to enter the bottom of the electrolysis bin 7; before this, the power source 6 is turned on, and the potassium nitrate solution enters the cathode tank 79 and the anode tank 792 through the first liquid supply pipe 793 and the second liquid supply pipe 794 respectively; under the action of the cathode electrolysis rod 71, the hydrogen gas is generated in the cathode tank 79, and alkaline substances appear in the cathode tank; under the action of the anode electrolysis rod 74, oxygen gas is generated in the anode, and acidic substances appear in the anode; the hydrogen gas is discharged and collected through the hydrogen gas discharge pipe 75, and the oxygen gas is discharged and collected through the oxygen gas discharge pipe 76; the CO2 gas is dissolved in the alkaline substances after entering the cathode tank 79, and then enters the gas-liquid separator 8, and the acidic substances of the anode enter the gas-liquid separator 8 to react with the alkaline substances to release heat, so that the CO2 gas is separated in the gas-liquid separator 8, and the separated CO2 gas is stored in the carbon dioxide storage tank 9.

[0030] The above completes one cycle process of CO2 capture, and the whole process can be controlled by the control unit, and the above process can be repeated to realize the high-temperature calcination of calcium carbonate coupled with electrolysis of water to produce hydrogen and capture of carbon dioxide.

Claims

1. A carbon dioxide capture device that uses high-temperature calcination of calcium carbonate coupled with water electrolysis to produce hydrogen, characterized by: The carbon dioxide capture device comprises a calcining furnace, a first dust falling chamber, a compressor, a steam turbine, a cooler, a second dust falling chamber, a steam turbine generator, a power supply, an electrolytic water unit, a gas-liquid separator, a storage tank and a control unit. The calcining furnace comprises a main furnace body and a flue and a combustion material tank arranged in the main furnace body; the combustion material tank is arranged in the flue, and a calcium carbonate feeding port and a carbon dioxide gas outlet are arranged at the top of the combustion material tank, and a solid product collecting hopper is arranged at the bottom of the combustion material tank; a preheating air channel, a fire observation hole and a temperature measuring hole are arranged on the side of the main furnace body. The electrolytic water unit comprises an electrolytic bin, a cathode electrolytic rod, an anode electrolytic rod, a negative ion exchange film and a positive ion exchange film; the electrolytic bin is sequentially divided into a cathode tank, a solution tank and an anode tank from one side to the other side by the negative ion exchange film and the positive ion exchange film; the cathode electrolytic rod is arranged in the cathode tank, and a first outlet is arranged at the bottom of the cathode tank; the anode electrolytic rod is arranged in the anode tank, and a second outlet is arranged at the bottom of the anode tank; a hydrogen discharge pipe is arranged on the upper part of the wall surface of the electrolytic bin close to the cathode tank, and a hydrogen storage tank is connected to the hydrogen discharge pipe; a first liquid supply pipe and a carbon dioxide gas inlet are arranged on the lower part of the wall surface of the electrolytic bin close to the cathode tank; an oxygen discharge pipe is arranged on the upper part of the wall surface of the electrolytic bin close to the anode tank, and an oxygen storage tank is connected to the oxygen discharge pipe; the first liquid supply pipe and the second liquid supply pipe are used for supplying potassium nitrate solution to the electrolytic bin; the first outlet and the second outlet are in communication with the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is in communication with the carbon dioxide storage tank. The carbon dioxide gas outlet of the combustion material tank is in communication with the gas inlet of the first dust falling chamber; the first dust falling chamber, the compressor, the steam turbine, the cooler and the second dust falling chamber are sequentially connected in the direction of carbon dioxide gas flow; the gas outlet of the second dust falling chamber is in communication with the carbon dioxide gas inlet of the electrolytic bin; the steam turbine is further connected with the steam turbine generator, the steam turbine generator is connected with the power supply, and the power supply is connected with the cathode electrolytic rod and the anode electrolytic rod. The control unit is used for controlling the working states of the components in the carbon dioxide capture device.

2. The carbon dioxide capture device according to claim 1, wherein two combustion material tanks are arranged in the main furnace body.

3. The carbon dioxide capture device according to claim 1, wherein the solid product collecting hopper is in the shape of an inverted frustum of a cone. ​ ​

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