Industrial waste gas CO2 trapping and converting device

Abstract

The invention relates to the technical field of industrial waste gas treatment, in particular to an industrial waste gas CO2 trapping and converting device which comprises a trapper, the trapper is composed of a spray tower and a liquid collecting tank, the bottom of the spray tower extends downwards into the liquid collecting tank, and the bottom of the spray tower extends downwards into the liquid collecting tank. The lower part and the upper part of the spray tower are respectively provided with a first air inlet and a first air outlet, the device further comprises a group of liquid storage tanks, the spray tower is fixedly connected with a liquid distribution pipe, the liquid storage tanks are connected with the liquid distribution pipe through a group of pump pipes, the liquid distribution pipe is provided with a plurality of groups of spray heads, the end parts of the plurality of groups of spray heads extend into the spray tower, and the pump pipes are arranged on the spray tower. And a decomposition tank is arranged on one side of the trap. According to the invention, the ethanolamine solution for capturing carbon dioxide can be recycled, the utilization rate is effectively improved, workers are prevented from frequently supplementing consumed adsorbents, and the captured carbon dioxide can be reasonably converted and utilized.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial waste gas treatment. Specifically, it relates to a device for capturing and converting CO2 in industrial waste gas. Background Art

[0002] The waste gas discharged from industrial production often has harmful effects on the environment and human health. Before being discharged into the atmosphere, purification measures should be taken to make it meet the requirements of the waste gas emission standards. This process is called waste gas purification. Industrial waste gas usually contains a large amount of carbon dioxide. In order to reduce carbon emissions and effectively utilize carbon dioxide resources, a carbon dioxide capture and conversion device is usually required to treat the waste gas.

[0003] Chinese Patent CN222111371U discloses a carbon dioxide capture and absorption device, including a storage tank. An air inlet pipe is arranged at the bottom of the storage tank, an exhaust pipe is arranged at the top of the storage tank, a feed inlet is arranged at the top end of the storage tank, a valve is arranged on the feed inlet, a net is arranged inside the storage tank, the net is concave downward in the middle, a discharge pipe is arranged at the bottom of the net, and the discharge pipe extends downward to the outside of the storage tank; however, this device captures carbon dioxide in the waste gas through a carbon dioxide adsorbent arranged inside the storage tank. It is difficult to extract the carbon dioxide in the adsorbent after the adsorbent captures carbon dioxide. Therefore, it is difficult to recycle the adsorbent during the capture process, resulting in a low utilization rate of the adsorbent. Workers need to frequently replenish the consumed adsorbent, and it is not conducive to the subsequent conversion and utilization of the adsorbed carbon dioxide. Summary of the Invention

[0004] The present invention provides a device for capturing and converting CO2 in industrial waste gas, which solves the technical problem of poor fixing effect on the patient's head in the prior art.

[0005] In view of the above problems, the technical solution proposed by the present invention is: A device for capturing and converting CO2 in industrial waste gas, including a capturer. The capturer is composed of two parts: a spray tower and a liquid collection tank. The bottom of the spray tower extends downward into the interior of the liquid collection tank. A first air inlet and a first exhaust port are respectively arranged at the lower and upper parts of the spray tower. The device also includes a group of liquid storage tanks. A liquid distribution pipe is fixedly connected to the spray tower. The liquid storage tanks are connected to the liquid distribution pipe through a group of pump pipes. A number of groups of nozzles are arranged on the liquid distribution pipe, and the ends of the number of groups of nozzles all extend into the interior of the spray tower. A decomposition tank is arranged on one side of the capturer. The decomposition tank is connected to the spray tower through a group of pump pipes. A heating component is arranged inside the decomposition tank. A ventilation pipe is connected to the top end of the decomposition tank. A reaction kettle connected to the ventilation pipe is arranged on one side of the decomposition tank.

[0006] Furthermore, the heating assembly includes an electric heater disposed inside the decomposition tank and a temperature sensor disposed on the decomposition tank. The probe of the temperature sensor extends into the interior of the decomposition tank, and the temperature sensor can be used to detect the temperature of the solution inside the decomposition tank.

[0007] Furthermore, a motor is installed at the top end of the decomposition tank, and a stirring rod extending into the interior of the decomposition tank is connected to the output shaft of the motor.

[0008] Furthermore, inclined baffles are provided inside the spray tower. The inclined baffles are distributed in several groups in a staggered manner up and down inside the spray tower, and the spray nozzles are distributed at positions between adjacent two groups of the inclined baffles.

[0009] Furthermore, a liquid level sensor and an alarm are installed on the liquid storage tank. The probe of the liquid level sensor extends into the interior of the liquid storage tank, and a scale groove is provided on the liquid storage tank.

[0010] Furthermore, a heat exchanger is provided between the liquid storage tank and the liquid separation pipe. Two ends of the heat exchanger are respectively connected to the pump pipes between the liquid storage tank and the liquid separation pipe.

[0011] Furthermore, a filter pipe is further provided on one side of the trap. A filter membrane sleeve is provided inside the filter pipe. A second air inlet and a second air outlet are respectively provided at the top end and the bottom end of the filter pipe, and the second air outlet is connected to the first air inlet on the spray tower.

[0012] Furthermore, an air storage tank is connected to the air pipe. The exhaust pipe of the air storage tank is connected to the reaction kettle, and a valve is provided on the exhaust pipe of the air storage tank.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the arrangement of structures such as the liquid storage tank, the liquid separation pipe, and the spray nozzles, the ethanolamine solution can be evenly sprayed into the interior of the spray tower and react with carbon dioxide in the industrial waste gas passing through the spray tower to generate ethanolamine carbonate compounds, thereby realizing the capture of carbon dioxide in the waste gas. After the generated ethanolamine carbonate compounds flow into the interior of the decomposition tank, they are decomposed under the heating action of the heating assembly. The decomposed ethanolamine solution will be retained in the decomposition tank and can flow back into the liquid storage tank through the pump pipe. Therefore, the recycling of the ethanolamine solution used for capturing carbon dioxide can be realized, effectively improving the utilization rate and avoiding the frequent replenishment of the consumed adsorbent by the staff. Moreover, the carbon dioxide generated by the decomposition of the ethanolamine carbonate compounds in the decomposition tank will react with the epoxide inside the reaction kettle to generate polycarbonate products, thereby realizing the reasonable conversion and utilization of the captured carbon dioxide. Description of the Drawings

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0015] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic diagram of the overall structure of the present invention; Figure 3 is a schematic diagram of the internal structure of the spray tower in the present invention; Figure 4 is a schematic diagram of the structures of the liquid distribution pipe and the nozzle in the present invention; Figure 5 is a schematic diagram of the internal structure of the decomposition tank in the present invention; Figure 6 is a schematic cross-sectional view of the filter pipe in the present invention.

[0016] In the figure: 1. Trapper; 2. Spray tower; 3. Liquid collection tank; 4. First air inlet; 5. First exhaust port; 6. Liquid storage tank; 7. Liquid distribution pipe; 8. Nozzle; 9. Decomposition tank; 10. Vent pipe; 11. Reactor; 12. Electric heater; 13. Temperature sensor; 14. Motor; 15. Stirring rod; 16. Inclined baffle; 17. Liquid level sensor; 18. Alarm; 19. Scale groove; 20. Heat exchanger; 21. Filter pipe; 22. Filter membrane sleeve; 23. Second air inlet; 24. Second exhaust port; 25. Gas storage tank. Specific embodiments

[0017] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0019] Please refer to Figures 1-6, An industrial waste gas CO2 capture and conversion device, including a trap 1, which is composed of two parts: a spray tower 2 and a liquid collection tank 3. The bottom of the spray tower 2 extends downward into the interior of the liquid collection tank 3. The lower and upper parts of the spray tower 2 are respectively provided with a first air inlet 4 and a first exhaust port 5. The discharged industrial waste gas enters the spray tower 2 through the first air inlet 4. The device also includes a group of liquid storage tanks 6, which are used to store ethanolamine solution inside. A liquid distribution pipe 7 is fixedly connected to the spray tower 2. The liquid storage tank 6 and the liquid distribution pipe 7 are connected by a group of pump pipes. A number of spray heads 8 are arranged on the liquid distribution pipe 7, and the ends of the number of spray heads 8 all extend into the interior of the spray tower 2. Through the pump pipes, the ethanolamine solution inside the liquid storage tank 6 can be pumped into the liquid distribution pipe 7. After being split by the liquid distribution pipe 7, the ethanolamine solution can be evenly sprayed into the interior of the spray tower 2 through a number of spray heads 8. When the industrial waste gas passes through the interior of the spray tower 2, it can fully and evenly contact the ethanolamine solution sprayed into the interior of the spray tower 2. At this time, the ethanolamine solution can react with CO2 in the industrial waste gas to form ethanolamine carbonate compounds, thereby capturing the carbon dioxide in the waste gas. The treated waste gas is discharged from the spray tower 2 through the first exhaust port 5 for people to carry out subsequent treatment of the waste gas. The generated ethanolamine carbonate compounds will flow through the bottom end of the spray tower 2 and be collected in the liquid collection tank 3. A decomposition tank 9 is arranged on one side of the trap 1. The decomposition tank 9 and the spray tower 2 are connected by a group of pump pipes. The ethanolamine carbonate compounds collected in the liquid collection tank 3 can be transported into the interior of the decomposition tank 9 through the pump pipes. A heating component is arranged inside the decomposition tank 9. Through the heating component, the ethanolamine carbonate compounds inside the decomposition tank 9 can be heated. When heated to 100°C - 150°C, the ethanolamine carbonate compounds can be decomposed into ethanolamine solution and carbon dioxide gas. A ventilation pipe 10 is connected to the top of the decomposition tank 9, and the ethanolamine solution will remain inside the decomposition tank 9. The carbon dioxide gas generated inside the decomposition tank 9 can be discharged through the ventilation pipe 10. A pump pipe is connected between the bottom of the decomposition tank 9 and the liquid storage tank 6. Through the pump pipe, the ethanolamine solution inside the decomposition tank 9 can be pumped into the liquid storage tank 6 to supplement the ethanolamine solution inside the liquid storage tank 6. A reaction kettle 11 connected to the ventilation pipe 10 is arranged on one side of the decomposition tank 9. When an epoxide is placed inside the reaction kettle 11, the carbon dioxide gas input into the reaction kettle 11 from the ventilation pipe 10 can react with the epoxide inside the reaction kettle 11 to generate a polycarbonate product.

[0020] Through the settings of structures such as the liquid storage tank 6, the liquid separation pipe 7, and the spray head 8, the ethanolamine solution can be evenly sprayed into the interior of the spray tower 2, enabling the industrial waste gas entering the interior of the spray tower 2 to come into uniform contact with the ethanolamine solution and react with carbon dioxide in the industrial waste gas to form ethanolamine carbonate compounds, thereby achieving the capture of carbon dioxide in the waste gas. The generated compounds flow downward with the solution and collect in the liquid collection tank 3. The waste gas after capture will be discharged through the first exhaust port 5 on the spray tower 2 for subsequent treatment. The ethanolamine carbonate compounds collected in the liquid collection tank 3 flow into the decomposition tank 9 through the pump pipe and then decompose under the heating action of the heating component. The decomposed ethanolamine solution will remain in the decomposition tank 9 and can flow back to the liquid storage tank 6 through the pump pipe. Since the ethanolamine solution flowing back into the liquid storage tank 6 can be sprayed into the interior of the spray tower 2 through the liquid separation pipe 7 and the spray head 8 again, the ethanolamine solution can be recycled when used to capture carbon dioxide in the waste gas, with a relatively high utilization rate. During use, only a small amount of the volatilized ethanolamine solution needs to be replenished. Additionally, the carbon dioxide gas generated during the decomposition in the decomposition tank 9 will enter the reaction kettle 11 through the ventilation pipe 10, enabling the epoxide in the reaction kettle 11 to react with carbon dioxide to form polycarbonate products, achieving the reasonable conversion and utilization of the captured carbon dioxide.

[0021] Further, please refer to Figures 1-6 , the heating component includes an electric heater 12 arranged inside the decomposition tank 9 and a temperature sensor 13 arranged on the decomposition tank 9. The probe of the temperature sensor 13 extends into the interior of the decomposition tank 9. The temperature sensor 13 can be used to detect the temperature of the solution inside the decomposition tank 9. When the temperature of the solution inside the decomposition tank 9 is lower than 100 °C, the temperature sensor 13 will transmit the temperature signal to the controller of the electric heater 12, causing the electric heater 12 to automatically heat the solution inside the decomposition tank 9. When the temperature inside the decomposition tank 9 reaches 150 °C, the temperature sensor 13 will transmit the temperature signal to the controller of the electric heater 12, causing the electric heater 12 to stop heating the solution inside the decomposition tank 9, so that the solution inside the decomposition tank 9 can always be maintained within a suitable temperature range, ensuring that the ethanolamine carbonate compounds inside the decomposition tank 9 can continuously undergo decomposition reactions.

[0022] Further, please refer to Figures 1-6 , a motor 14 is installed at the top of the decomposition tank 9, and a stirring rod 15 extending into the interior of the decomposition tank 9 is connected to the output shaft of the motor 14. By driving the stirring rod 15 to rotate through the output shaft of the motor 14, the solution inside the decomposition tank 9 can be stirred, so that the solution inside the decomposition tank 9 can come into uniform and full contact with the electric heater 12, enabling the solution inside the decomposition tank 9 to be heated more evenly and improving the heating efficiency.

[0023] Further, please refer to Figures 1-6 , an inclined baffle 16 is arranged inside the spray tower 2. The inclined baffle 16 is distributed in several groups up and down in a staggered manner inside the spray tower 2, and the nozzles 8 are distributed at the positions between two adjacent groups of inclined baffles 16. The several groups of inclined baffles 16 can play an isolating role inside the spray tower 2, so that the waste gas passing through the inside of the spray tower 2 flows in a folded shape inside the spray tower 2. When the waste gas passes between two adjacent groups of inclined baffles 16, it will come into contact with the ethanolamine sprayed by the nozzles 8. Therefore, the flow path of the waste gas inside the spray tower 2 is extended, so that the carbon dioxide in the waste gas can come into contact with the ethanolamine solution more fully and react, thus ensuring the capture effect of carbon dioxide in the waste gas. And the solution sprayed from the nozzles 8 will flow downward along the inclined direction of 16 and converge into the liquid collecting tank 3.

[0024] Further, please refer to Figures 1-6 , a liquid level sensor 17 and an alarm 18 are installed on the liquid storage tank 6. The probe of the liquid level sensor 17 extends into the inside of the liquid storage tank 6. The liquid level sensor 17 can be used to monitor the stock of the ethanolamine solution inside the liquid storage tank 6 in real time. When the stock of the solution is lower than the preset value, the liquid level sensor 17 will transmit the monitored signal to the alarm 18 and cause the alarm 18 to emit an alarm prompt sound, so as to prompt the staff to supplement the ethanolamine solution into the liquid storage tank 6 in time. And a scale groove 19 is arranged on the liquid storage tank 6, and the staff can also more intuitively see the stock of the ethanolamine inside the liquid storage tank 6 through the scale groove 19.

[0025] Further, please refer to Figures 1-6 , a heat exchanger 20 is arranged between the liquid storage tank 6 and the liquid distribution pipe 7. The two ends of the heat exchanger 20 are respectively connected to the pump pipes between the liquid storage tank 6 and the liquid distribution pipe 7. When the ethanolamine solution in the liquid storage tank 6 flows into the inside of the liquid distribution pipe 7 through the pump pipe, the heat exchanger 20 can cool down the passing ethanolamine solution, so that the ethanolamine can be sprayed into the inside of the spray tower 2 at a lower temperature, ensuring the capture effect of the ethanolamine solution on the carbon dioxide in the waste gas.

[0026] Further, please refer to Figures 1-6, a filter tube 21 is also provided on one side of the collector 1. A filter membrane sleeve 22 is arranged inside the filter tube 21. A second air inlet 23 and a second air outlet 24 are respectively arranged at the top and bottom of the filter tube 21. The second air outlet 24 is connected to the first air inlet 4 on the spray tower 2. The waste gas generated in the industrial production process enters the inside of the filter tube 21 through the second air inlet 23. When the waste gas passes through the filter tube 21, the filter membrane sleeve 22 can filter the dust therein, preventing the dust in the waste gas from entering the spray tower 2 and contacting the ethanolamine solution sprayed into the inside of the spray tower 2, thereby avoiding polluting the recycled ethanolamine solution.

[0027] Further, please refer to Figures 1-6 , an air storage tank 25 is connected to the air pipe 10. The exhaust pipe of the air storage tank 25 is connected to the reaction kettle 11. A valve is arranged on the exhaust pipe of the air storage tank 25. The carbon dioxide gas discharged from the air pipe 10 can be temporarily stored through the air storage tank 25. When carbon dioxide is needed inside the reaction kettle 11, the exhaust pipe valve of the air storage tank 25 can be opened, ensuring the conversion utilization rate of carbon dioxide.

[0028] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An industrial waste gas CO2 capture and conversion device, characterized in that, It includes a trap (1), which is composed of two parts: a spray tower (2) and a liquid collection tank (3). The bottom of the spray tower (2) extends downward into the interior of the liquid collection tank (3). A first air inlet (4) and a first air outlet (5) are respectively arranged at the lower and upper parts of the spray tower (2). The device further includes a group of liquid storage tanks (6). A liquid separation pipe (7) is fixedly connected to the spray tower (2). The liquid storage tanks (6) and the liquid separation pipe (7) are connected by a group of pump pipes. A number of groups of nozzles (8) are arranged on the liquid separation pipe (7), and the ends of the number of groups of nozzles (8) all extend into the interior of the spray tower (2). A decomposition tank (9) is arranged on one side of the trap (1). The decomposition tank (9) and the spray tower (2) are connected by a group of pump pipes. A heating component is arranged inside the decomposition tank (9). A ventilation pipe (10) is connected to the top of the decomposition tank (9). A reaction kettle (11) connected to the ventilation pipe (10) is arranged on one side of the decomposition tank (9).

2. The industrial waste gas CO2 capture and conversion device according to claim 1, characterized in that, The heating component includes an electric heater (12) arranged inside the decomposition tank (9) and a temperature sensor (13) arranged on the decomposition tank (9). The probe of the temperature sensor (13) extends into the interior of the decomposition tank (9), and the temperature sensor (13) can be used to detect the temperature of the solution inside the decomposition tank (9).

3. The industrial waste gas CO2 capture and conversion device according to claim 2, characterized in that, A motor (14) is installed at the top of the decomposition tank (9), and a stirring rod (15) extending into the interior of the decomposition tank (9) is connected to the output shaft of the motor (14).

4. The industrial waste gas CO2 capture and conversion device according to claim 1, characterized in that, An inclined baffle (16) is arranged inside the spray tower (2). The inclined baffle (16) is distributed in several groups in a staggered manner up and down inside the spray tower (2), and the nozzles (8) are distributed at the positions between adjacent two groups of inclined baffles (16).

5. The industrial waste gas CO2 capture and conversion device according to claim 1, characterized in that A liquid level sensor (17) and an alarm (18) are installed on the liquid storage tank (6). The probe of the liquid level sensor (17) extends into the interior of the liquid storage tank (6), and a scale groove (19) is arranged on the liquid storage tank (6).

6. The industrial waste gas CO2 capture and conversion device according to claim 1, characterized in that, A heat exchanger (20) is arranged between the liquid storage tank (6) and the liquid separation pipe (7), and the two ends of the heat exchanger (20) are respectively connected to the pump pipes between the liquid storage tank (6) and the liquid separation pipe (7).

7. The industrial waste gas CO2 capture and conversion device according to claim 1, characterized in that, A filter pipe (21) is further arranged on one side of the trap (1). A filter membrane sleeve (22) is arranged inside the filter pipe (21). A second air inlet (23) and a second air outlet (24) are respectively arranged at the top and bottom of the filter pipe (21), and the second air outlet (24) is connected to the first air inlet (4) on the spray tower (2).

8. The industrial waste gas CO2 capture and conversion device according to claim 1, characterized in that, A gas storage tank (25) is connected to the ventilation pipe (10). The exhaust pipe of the gas storage tank (25) is connected to the reaction kettle (11), and a valve is arranged on the exhaust pipe of the gas storage tank (25).

Images