Non-ferrous metallurgical furnace flue gas carbon dioxide variable-temperature negative-pressure adsorption double-tower device

Abstract

The invention provides a non-ferrous metallurgical furnace flue gas carbon dioxide variable-temperature negative-pressure adsorption double-tower device. The device comprises an adsorption tower A, an adsorption tower B, a flue gas pipeline subjected to dust removal, pressurization and cooling, and an electric three-way ball valve. According to the non-ferrous metallurgical furnace flue gas carbon dioxide variable-temperature negative-pressure adsorption double-tower device provided by the invention, flue gas carbon dioxide variable-temperature negative-pressure adsorption double towers are used as a trapping device main body; each adsorption tower is provided with a flue gas inlet, an adsorption tank filled with a porous aminated carbon-based adsorbent, a heat conduction oil heating device arranged in the adsorption tank, an exhaust gas discharging device, a carbon dioxide variable-temperature variable-pressure negative-pressure recovery pipeline, a heat conduction oil heat supply system and an adsorption tower cooling system, and the adsorption double towers are arranged in the steel structure frame; the captured carbon dioxide gas enters a carbon dioxide gas phase gas storage cabinet through a variable-temperature variable-pressure negative-pressure recovery pipeline, and exhaust gas of the device returns to an original flue gas discharge chimney through a discharge device, so that the capture efficiency of the carbon dioxide is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of nonferrous metallurgy and gas separation, and in particular to a temperature-variable negative pressure adsorption double-tower device for carbon dioxide in flue gas from a nonferrous metallurgical furnace. Background Art

[0002] Nonferrous metallurgical furnaces are the core energy-consuming equipment in the metallurgical industry, but their low energy efficiency, high energy consumption and large CO2 emissions are bottlenecks that restrict the realization of the "dual carbon" goals of the nonferrous metallurgical industry. CO2 emissions from the nonferrous metallurgical industry account for more than 6% of the country's total emissions, so carbon emission reduction is the most realistic challenge facing the metallurgical industry. CO2 capture and utilization of terminal negative carbon technology is an effective way for my country's metallurgical industry to develop green and low-carbon under the background of carbon neutrality.

[0003] However, the nonferrous metallurgical industry is different from the steel metallurgical industry. In the smelting process, there are problems such as the coexistence of multiple components in the flue gas, high content of harmful substances such as sulfur species, large temperature fluctuations in the gas, and high water vapor content. These problems result in low CO2 capture efficiency, short equipment life, and high energy consumption, resulting in insufficient resource utilization of CO2 in metallurgical furnaces and a severe emission reduction situation.

[0004] Therefore, it is necessary to provide a non-ferrous metallurgical furnace flue gas carbon dioxide variable temperature negative pressure adsorption double tower device to solve the above technical problems. Summary of the invention

[0005] The present invention provides a temperature-variable negative pressure adsorption double-tower device for carbon dioxide in the flue gas of a non-ferrous metallurgical furnace, which solves the problems of coexistence of multiple components in the flue gas of non-ferrous metallurgy, a large number of harmful substances, large temperature fluctuations, and high water vapor content, resulting in low CO2 capture efficiency, short equipment life, high energy consumption, insufficient resource utilization of CO2 in metallurgical furnaces, and severe emission reduction situation.

[0006] In order to solve the above technical problems, the present invention provides a non-ferrous metallurgical furnace flue gas carbon dioxide variable temperature negative pressure adsorption double tower device, comprising: an adsorption tower A, an adsorption tower B, a flue gas pipeline after dust removal, pressurization and cooling, an electric three-way ball valve, an exhaust gas discharge pipeline, a positive pressure carbon dioxide gas phase pipeline, a vacuum pump and inlet and outlet pipes, a carbon dioxide buffer gas storage cabinet, an adsorption tower heat transfer oil heating system, a heat transfer oil reflux system, an adsorption tower cooling system, a PLC control system, a concrete foundation and a steel multi-layer frame; The output ends of the flue gas pipeline after dust removal, pressurization and cooling are respectively fixedly installed at the bottom of the adsorption tower A and the adsorption tower B, the electric three-way ball valve is respectively fixedly installed at the top of the adsorption tower A and the adsorption tower B, the exhaust gas discharge pipeline is fixedly installed at the output end of the electric three-way ball valve, the positive pressure carbon dioxide gas phase pipeline is respectively arranged at the top of the adsorption tower A and the adsorption tower B, the adsorption tower heat transfer oil heating system is respectively arranged at the top of the adsorption tower A and the adsorption tower B, the heat transfer oil reflux system is respectively arranged on the side of the adsorption tower A and the adsorption tower B, the PLC control system is arranged on one side of the adsorption tower B, the carbon dioxide buffer gas storage cabinet is arranged at the bottom of the PLC control system, and the vacuum pump and the inlet and outlet pipes are arranged on one side of the carbon dioxide buffer gas storage cabinet; The operating temperature of the heat transfer oil of the heat transfer oil heating system of the adsorption tower is designed to be 200°C. The heat transfer oil heating system and the heat transfer oil reflux system continue to operate during the desorption process of the adsorption tower, and return the heat transfer oil after heat exchange to the solar heat transfer oil heating device; after the desorption is completed, the adsorption tower is cooled by using the adsorption tower cooling system; The adsorption tower cooling system is used to cool the adsorption tower after desorption of the adsorption tower is completed, so as to achieve a good carbon dioxide adsorption effect of the adsorption tower.

[0007] Preferably, the flue gas duct after dust removal and pressurized cooling includes an air intake main pipe, a CO2 content analyzer, a variable temperature and pressure swing adsorption tower air intake branch pipe, an electric gate valve for the air intake branch pipe of adsorption tower A, a variable temperature and pressure swing adsorption tower B air intake branch pipe, and an electric gate valve for the air intake branch pipe of adsorption tower B. The CO2 content analyzer is fixedly installed at one end of the air intake main pipe, the air intake branch pipe of the variable temperature and pressure swing adsorption tower is fixedly installed on one side of the air intake main pipe, the electric gate valve for the air intake branch pipe of adsorption tower A is fixedly installed at one end of the air intake branch pipe of the variable temperature and pressure swing adsorption tower, the electric gate valve for the air intake branch pipe of adsorption tower A is fixedly installed on one side of the adsorption tower A, one end of the air intake branch pipe of the variable temperature and pressure swing adsorption tower B is fixedly installed at the other end of the air intake main pipe, the electric gate valve for the air intake branch pipe of adsorption tower B is fixedly installed at the other end of the air intake branch pipe of the variable temperature and pressure swing adsorption tower B, and the electric gate valve for the air intake branch pipe of adsorption tower B is fixedly installed on one side of the adsorption tower B.

[0008] Preferably, the exhaust gas emission pipeline includes an exhaust gas emission main pipe, an exhaust gas emission branch pipe of adsorption tower A, an exhaust gas emission CO2 content analyzer of adsorption tower A, an exhaust gas emission branch pipe of adsorption tower B, and an exhaust gas emission CO2 content analyzer of adsorption tower B. The exhaust gas emission CO2 content analyzer of adsorption tower A is arranged on one side of the adsorption tower A, the exhaust gas emission CO2 content analyzer of adsorption tower B is arranged on one side of the adsorption tower B, the exhaust gas emission branch pipe of adsorption tower B is fixedly installed on one side of the exhaust gas emission CO2 content analyzer of adsorption tower A, and the exhaust gas emission main pipe is fixedly installed on one end of the exhaust gas emission branch pipe of adsorption tower B.

[0009] Preferably, the positive pressure carbon dioxide gas phase pipeline includes a gas phase carbon dioxide recovery branch pipe of adsorption tower A, a gas phase carbon dioxide recovery main pipe, a gas phase carbon dioxide recovery branch pipe of adsorption tower B, and an electric gate valve. The gas phase carbon dioxide recovery branch pipe of adsorption tower B is arranged on one side of the adsorption tube B, and the gas phase carbon dioxide recovery branch pipe of adsorption tower A is arranged on one side of the adsorption tube A.

[0010] Preferably, the gas phase carbon dioxide recovery main pipe is fixedly installed at one end of the gas phase carbon dioxide recovery branch pipe of the adsorption tower A and the gas phase carbon dioxide recovery branch pipe of the adsorption tower B, and the electric gate valve is fixedly installed at one end of the gas phase carbon dioxide recovery main pipe.

[0011] Preferably, the vacuum pump and inlet and outlet pipes include an inlet pipe, an inlet electric gate valve, an inlet expansion joint, an inlet local negative pressure gauge, an inlet pressure sensor, a vacuum pump, an outlet local pressure gauge, an outlet pressure sensor, an outlet expansion joint, an outlet electric gate valve, an outlet pipe, a muffler, and a vacuum pump bracket. The inlet pipe is fixedly installed on one side of the positive pressure carbon dioxide gas phase pipeline, the inlet electric gate valve is fixedly installed on the bottom of the inlet pipe, the inlet expansion joint is fixedly installed on the bottom of the inlet electric gate valve, the inlet pressure sensor is fixedly installed on one side of the inlet expansion joint, the inlet local negative pressure gauge is fixedly installed on the other side of the inlet expansion joint, the vacuum pump is fixedly installed on the top of the inlet expansion joint, and the outlet expansion joint is fixedly installed on the bottom of the vacuum pump.

[0012] Preferably, the outlet on-site pressure gauge is fixedly installed on one side of the outlet expansion joint, the outlet pressure sensor is fixedly installed on the other side of the outlet expansion joint, the outlet electric gate valve is fixedly installed on the bottom of the outlet expansion joint, the vacuum pump bracket is fixedly installed on the bottom of the vacuum pump, the outlet pipe is fixedly installed on the bottom of the outlet electric gate valve, and the muffler is arranged on the outer side of the outlet pipe.

[0013] Preferably, the heat transfer oil reflux system includes a jacket return oil cut-off valve, an adsorption tower A return oil pipeline, an adsorption tower B jacket return oil cut-off valve, an adsorption tower B return oil pipeline, an adsorption tower A jacket unloading oil cut-off valve, an adsorption tower A internal heat exchange loop oil unloading cut-off valve, an adsorption tower A unloading pipeline, an adsorption tower B jacket unloading oil cut-off valve, an adsorption tower B internal heat exchange loop oil unloading cut-off valve, an adsorption tower B unloading pipeline, a return oil storage tank, an oil return pump and an oil return pipeline, the jacket return oil cut-off valve and the adsorption tower A return oil pipeline are both arranged on one side of the adsorption tower A, the jacket return oil cut-off valve is connected to one end of the adsorption tower A return oil pipeline, the adsorption tower B jacket return oil cut-off valve and the adsorption tower B return oil pipeline are both arranged on one side of the adsorption tower B, and the adsorption tower B jacket return oil cut-off valve is connected to one end of the adsorption tower B return oil pipeline.

[0014] Preferably, the jacket oil unloading cut-off valve of the adsorption tower A, the oil unloading cut-off valve of the heat exchange loop pipe in the adsorption tower A and the oil unloading pipeline of the adsorption tower A are connected, and one end of the jacket oil unloading cut-off valve of the adsorption tower A and the oil unloading cut-off valve of the heat exchange loop pipe in the adsorption tower A are respectively arranged on both sides of the adsorption tower A, the jacket oil unloading cut-off valve of the adsorption tower B, the oil unloading cut-off valve of the heat exchange loop pipe in the adsorption tower B and the oil unloading pipeline of the adsorption tower B are connected, and one end of the jacket oil unloading cut-off valve of the adsorption tower B and the oil unloading cut-off valve of the heat exchange loop pipe in the adsorption tower B are respectively arranged on both sides of the adsorption tower B, the return oil storage tank is respectively connected to the return oil pipeline of the adsorption tower A and the return oil pipeline of the adsorption tower B, the return oil pump is fixedly installed on one side of the return oil storage tank, and the return oil pipeline is fixedly installed on one end of the return oil pump.

[0015] Preferably, each plane of the concrete foundation and the steel multi-story frame is provided with a level operating platform, and an inclined ladder is provided between each of the level operating platforms.

[0016] Compared with the related art, the non-ferrous metallurgical furnace flue gas carbon dioxide temperature variable negative pressure adsorption double tower device provided by the present invention has the following beneficial effects: The present invention provides a temperature-variable negative pressure adsorption double-tower device for carbon dioxide in flue gas of a nonferrous metallurgical furnace. The temperature-variable negative pressure adsorption double-tower device for carbon dioxide in flue gas is used as the main body of the capture device. Each adsorption tower is provided with a flue gas inlet, an adsorption tank filled with a porous aminated carbon-based adsorbent, a heat transfer oil heating device arranged in the adsorption tank, a waste gas discharge device, a carbon dioxide temperature-variable negative pressure recovery pipeline, a heat transfer oil heating system, and an adsorption tower cooling system. The adsorption double tower is arranged in a steel structure frame, and the captured carbon dioxide gas passes through the temperature-variable negative pressure recovery pipeline and enters the carbon dioxide gas phase gas storage cabinet. The waste gas of the device passes through the discharge device and returns to the original flue gas discharge chimney, thereby effectively improving the capture efficiency of carbon dioxide. Through the synergistic effect of optimized adsorption tower structure and efficient thermal oil heating device and cooling system, the problem of low capture efficiency of traditional devices under complex flue gas conditions has been overcome, providing a strong guarantee for the reduction of carbon dioxide emissions from metallurgical furnaces. At the same time, reasonable design has also extended the service life of the equipment, reduced energy consumption, and improved the level of carbon dioxide resource utilization in metallurgical furnaces, effectively alleviating the severe emission reduction situation. In addition, the device occupies a small area and achieves efficient carbon dioxide capture function in a limited space, minimizing the possibility of environmental pollution. It has low construction investment, which reduces the cost burden for enterprises. It is also flexible to use and can be adjusted and optimized according to different production needs and flue gas conditions, adapting to various complex non-ferrous metallurgical production scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a preferred embodiment of a double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of a non-ferrous metallurgical furnace provided by the present invention; Figure 2 It is a schematic diagram of the first floor layout of the double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of nonferrous metallurgical furnaces of the present invention; Figure 3 It is a schematic diagram of the bottom layout of the second-layer adsorption tower of the double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of non-ferrous metallurgical furnaces of the present invention; Figure 4 It is a schematic diagram of the top arrangement of the second-layer adsorption tower of the double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of nonferrous metallurgical furnaces of the present invention; Figure 5 It is a schematic diagram of the three-layer arrangement of the double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of non-ferrous metallurgical furnaces according to the present invention; Figure 6 It is a layout diagram of flue gas pipelines after dust removal, pressurization and cooling of the flue gas carbon dioxide temperature-variable negative pressure adsorption double-tower device of the present invention; Figure 7 This is a layout diagram of the exhaust gas discharge pipeline of the flue gas carbon dioxide temperature-variable negative pressure adsorption double-tower device of the present invention; Figure 8 This is a layout diagram of the outlet of the positive pressure carbon dioxide gas phase pipeline adsorption tower of the temperature-swing negative pressure adsorption double tower device of the present invention; Fig. 9 This is a layout diagram of the first layer of the positive pressure carbon dioxide gas phase pipeline of the temperature-swing negative pressure adsorption double tower device of the present invention; Fig.10 It is a vertical layout diagram of the vacuum pump and inlet and outlet pipes of the temperature-variable negative pressure adsorption double tower device of the present invention; Fig.11 This is a layout diagram of the vacuum pump and inlet and outlet valves of the present invention; Fig.12 This is a plan view of the oil outlet of the heat transfer oil reflux system of the present invention; Fig.13 It is a schematic elevation view of the heat transfer oil reflux system of the present invention.

[0018] Numbers in the figure: 1. Adsorption tower A; 2. Adsorption tower B; 3. Flue gas pipeline after dust removal, pressurization and cooling; 4. Electric three-way ball valve; 5. Exhaust gas discharge pipeline; 6. Positive pressure carbon dioxide gas pipeline; 6. Vacuum pump and inlet and outlet pipes; 8. Carbon dioxide buffer gas storage cabinet; 9. Adsorption tower thermal oil heating system; 10. Thermal oil reflux system; 11. Adsorption tower cooling system; 12. PLC control system; 13. Concrete foundation and steel multi-layer frame; 75. Air intake main pipe; 76. CO2 content analyzer; 77. Variable temperature Pressure swing adsorption tower A inlet branch pipe; 78, adsorption tower A inlet branch pipe electric gate valve; 79, temperature swing adsorption tower B inlet branch pipe; 80, adsorption tower B inlet branch pipe electric gate valve; 81, exhaust gas discharge main pipe; 82, adsorption tower A exhaust gas discharge branch pipe; 83, adsorption tower A exhaust gas discharge CO2 content analyzer; 84, adsorption tower B exhaust gas discharge branch pipe; 85, adsorption tower B exhaust gas discharge CO2 content analyzer; 86, adsorption tower A gas phase carbon dioxide recovery branch pipe; 87, gas phase carbon dioxide recovery main pipe; 88, adsorption tower B Gaseous carbon dioxide recovery branch pipe; 89, electric gate valve; 90, inlet pipe; 91, inlet electric gate valve; 92, inlet expansion joint; 93, inlet local negative pressure gauge; 94, inlet pressure sensor; 95, vacuum pump; 96, outlet local pressure gauge; 97, outlet pressure sensor; 98, outlet expansion joint; 99, outlet electric gate valve; 100, outlet pipe; 101, muffler; 102, vacuum pump bracket; 134, jacket return oil cut-off valve; 135, adsorption tower A return oil pipeline; 136, adsorption tower B jacket Oil return cut-off valve; 137. Oil return pipeline of adsorption tower B; 138. Jacket oil unloading cut-off valve of adsorption tower A; 139. Oil unloading cut-off valve of heat exchange loop pipe in adsorption tower A; 140. Oil unloading pipeline of adsorption tower A; 141. Jacket oil unloading cut-off valve of adsorption tower B; 142. Oil unloading cut-off valve of heat exchange loop pipe in adsorption tower B; 143. Oil unloading pipeline of adsorption tower B; 144. Oil return storage tank; 145. Oil return pump; 146. Oil return pipeline; 147. Carbon dioxide reflux pipeline; 159. Layer operation plane; 160. Inter-layer inclined ladder. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0020] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 ,in, Figure 1 A schematic structural diagram of a preferred embodiment of a double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of a non-ferrous metallurgical furnace provided by the present invention; Figure 2 It is a schematic diagram of the first floor layout of the double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of nonferrous metallurgical furnaces of the present invention; Figure 3 It is a schematic diagram of the bottom layout of the second-layer adsorption tower of the double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of non-ferrous metallurgical furnaces of the present invention; Figure 4 It is a schematic diagram of the top arrangement of the second-layer adsorption tower of the double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of nonferrous metallurgical furnaces of the present invention; Figure 5 It is a schematic diagram of the three-layer arrangement of the double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of non-ferrous metallurgical furnaces according to the present invention; Figure 6 It is a layout diagram of flue gas pipelines after dust removal, pressurization and cooling of the flue gas carbon dioxide temperature-variable negative pressure adsorption double-tower device of the present invention; Figure 7 This is a layout diagram of the exhaust gas discharge pipeline of the flue gas carbon dioxide temperature-variable negative pressure adsorption double-tower device of the present invention; Figure 8 This is a layout diagram of the outlet of the positive pressure carbon dioxide gas phase pipeline adsorption tower of the temperature-swing negative pressure adsorption double tower device of the present invention; Fig. 9 This is a layout diagram of the first layer of the positive pressure carbon dioxide gas phase pipeline of the temperature-swing negative pressure adsorption double tower device of the present invention; Fig.10 It is a vertical layout diagram of the vacuum pump and inlet and outlet pipes of the temperature-variable negative pressure adsorption double tower device of the present invention; Fig.11 This is a layout diagram of the vacuum pump and inlet and outlet valves of the present invention; Fig.12 This is a plan view of the oil outlet of the heat transfer oil reflux system of the present invention; Fig.13 A non-ferrous metallurgical furnace flue gas carbon dioxide variable temperature negative pressure adsorption double tower device, comprising: adsorption tower A1, adsorption tower B2, dust removal pressurized cooling flue gas pipeline 3, electric three-way ball valve 4, exhaust gas discharge pipeline 5, positive pressure carbon dioxide gas pipeline 6, vacuum pump and inlet and outlet pipes 7, carbon dioxide buffer gas storage cabinet 8, adsorption tower heat transfer oil heating system 9, heat transfer oil reflux system 10, adsorption tower cooling system 11, PLC control system 12, concrete foundation and steel multi-layer frame 13; The output ends of the flue gas pipeline 3 after dust removal, pressurization and cooling are respectively fixedly installed at the bottom of the adsorption tower A1 and the adsorption tower B2, the electric three-way ball valve 4 is respectively fixedly installed at the top of the adsorption tower A1 and the adsorption tower B2, the exhaust gas discharge pipeline 5 is fixedly installed at the output end of the electric three-way ball valve 4, the positive pressure carbon dioxide gas phase pipeline 6 is respectively arranged at the top of the adsorption tower A1 and the adsorption tower B2, the adsorption tower thermal oil heating system 9 is respectively arranged at the top of the adsorption tower A1 and the adsorption tower B2, the thermal oil reflux system 10 is respectively arranged on the side of the adsorption tower A1 and the adsorption tower B2, the PLC control system 12 is arranged on one side of the adsorption tower B2, the carbon dioxide buffer gas storage cabinet 8 is arranged at the bottom of the PLC control system 12, and the vacuum pump and the inlet and outlet pipes 7 are arranged on one side of the carbon dioxide buffer gas storage cabinet 8; The working temperature of the heat transfer oil of the adsorption tower heat transfer oil heating system 9 is designed to be 200°C. The heat transfer oil heating system 9 and the heat transfer oil reflux system 10 continue to operate during the desorption process of the adsorption tower, and return the heat transfer oil after heat exchange to the solar heat transfer oil heating device; after the desorption is completed, the adsorption tower is cooled by the adsorption tower cooling system 11; The adsorption tower cooling system 11 is used to cool the adsorption tower after desorption of the adsorption tower is completed, so as to achieve a good carbon dioxide adsorption effect of the adsorption tower.

[0021] Since the flue gas from the dust removal and pressurized cooling system still contains a lot of harmful substances, adsorption tower A1 and adsorption tower B2 use porous aminated carbon-based adsorbent 14. This adsorbent does not adsorb most harmful substances, but has a strong adsorption capacity for carbon dioxide. Therefore, it can be widely used in the capture of carbon dioxide in the flue gas of non-ferrous metallurgical furnaces.

[0022] Adsorption tower A1 and adsorption tower B2 are symmetrically arranged on the second layer of the steel multilayer frame 12, and the third layer is provided with reserved holes at corresponding positions to facilitate the filling of porous aminated carbon-based adsorbent in the adsorption tower. The porous aminated carbon-based adsorbent is transported in ton bags and lifted by a truck crane.

[0023] The flue gas pipeline 3 after dust removal, pressurization and cooling is introduced from outside the device, and the gas temperature is required to be less than 10°C. The carbon dioxide gas enters the adsorption tower A1 and the adsorption tower B2 from the bottom. The carbon dioxide gas is adsorbed by the porous aminated carbon-based adsorbent, and the exhaust gas is discharged back to the original chimney through the top electric three-way ball valve 4 and the exhaust gas discharge pipeline 5. When the data measured by the CO2 analyzer 83 in the exhaust gas discharge pipeline 5 is 25% of the imported CO2 content, the device automatically switches from the adsorption tower A1 to the adsorption tower B2, or from the adsorption tower B2 to the adsorption tower A1 for carbon dioxide adsorption. The adsorption tower that has not adsorbed carbon dioxide is converted to the carbon dioxide desorption state by the electric three-way ball valve 4. At this time, the positive pressure carbon dioxide gas phase pipeline 6, the adsorption tower thermal oil heating system 9, and the thermal oil reflux system 10 are opened by the PLC control system 12. The corresponding adsorption tower valves, when the network pressure is greater than 5kPa, the carbon dioxide gas directly enters the carbon dioxide buffer gas storage cabinet 8. When the network pressure is less than 5kPa, the vacuum pump and the inlet and outlet pipes 7 start to run. At this time, the PLC interlocking must be set according to the vacuum pump operating instructions. When the pressure in the adsorption tower is -75kPa, the desorption of carbon dioxide in the adsorption tower is stopped.

[0024] Adsorption tower A1 and adsorption tower B2 both include a shell, an air inlet tee, an air inlet diffuser, a built-in heat exchange loop pipe, an air outlet diffuser, an adsorbent loading hole, an adsorbent unloading hole and a porous aminated carbon-based adsorbent. The top of the shell is respectively provided with an on-site pressure gauge, a positive pressure sensor and a negative pressure sensor. The air inlet tee is arranged at the bottom of the shell, the air inlet diffuser is arranged on the inner side of the shell, and the input end of the air inlet diffuser is connected to the output end of the air inlet tee, the built-in heat exchange loop pipe is arranged on the inner side of the shell, and the input end and output end of the built-in heat exchange loop pipe are both connected to the heat transfer oil inlet and outlet pipes, and the outlet The gas dispersion outlet is arranged on the inner side of the shell, the adsorbent loading hole is arranged on the top of the shell, the adsorbent discharge hole is arranged on the side of the shell, and the porous aminated carbon-based adsorbent is arranged on the inner side of the shell; the shell includes a lower tank body, an upper head, a connecting flange pair, a heat transfer oil heating jacket, an insulation layer and an aluminum protective plate, a leg, an adsorbent loading hole pipe seat, an adsorbent discharge hole pipe seat, an internal heat exchange loop oil inlet pipe seat, an internal heat exchange loop oil outlet pipe seat, a jacket oil inlet, a jacket oil outlet, a carbon dioxide outlet, a negative pressure sensor interface and a positive pressure sensor interface, and the upper head is arranged at At the top of the lower tank body, the connecting flange pairs are respectively arranged at the two ends of the bottom of the upper head and the two ends of the top of the lower tank body, the heat transfer oil heating jacket is arranged on the outer side of the lower tank body, the insulation layer and the aluminum protective plate are arranged on the outer side of the lower tank body, the legs are respectively fixedly installed around the bottom of the lower tank body, the adsorbent loading hole pipe seat is fixedly installed on the top of the upper head, the adsorbent discharge hole pipe seat is fixedly installed on the side of the lower tank body, the built-in heat exchange loop oil inlet pipe seat is fixedly installed on the other side of the lower tank body, the built-in heat exchange loop oil outlet pipe seat is fixedly installed on one side of the lower tank body, and the jacket oil outlet is fixedly installed. At the top of one side of the lower tank body, the carbon dioxide outlet is fixedly installed on the top of the upper head, the negative pressure sensor interface is fixedly installed on the top of the upper head, the positive pressure sensor interface is fixedly installed on the top of the upper head, and the lower tank body, the upper head and the connecting flange pair are all provided with acid-resistant rubber linings inside; the adsorbent loading hole pipe seat is fixedly installed on the bottom of the adsorbent loading hole, the adsorbent discharge hole pipe seat is fixedly installed on one side of the adsorbent discharge hole, the negative pressure sensor interface is fixedly installed on the bottom of the negative pressure sensor, and the positive pressure sensor interface is fixedly installed on the bottom of the positive pressure sensor;The air inlet tee comprises a flange seamless steel pipe, a first seamless steel pipe and a flange, the first seamless steel pipe is fixedly installed at the bottom of the flange seamless steel pipe, and the flanges are fixedly installed at both ends of the first seamless steel pipe, and the air inlet diffuser comprises a second seamless steel pipe, a diffuser seamless steel pipe, an air inlet flange, a first flange pair, a stainless steel graphite winding pad, a first stainless steel filter screen and a second stainless steel filter screen, the diffuser seamless steel pipe is fixedly installed at the bottom of the second seamless steel pipe, the air inlet flange is fixedly installed at the bottom of the diffuser seamless steel pipe, the air inlet flange is fixedly installed at the top of the first seamless steel pipe, the first flange pair is respectively arranged at both ends of the second seamless steel pipe, and the first stainless steel filter screen and the second stainless steel filter screen are respectively arranged at the two The side of the first flange pair, the stainless steel graphite wound gasket is arranged on the outer side of the first stainless steel filter screen and the second stainless steel filter screen; the internal heat exchange loop pipe includes an inlet flange pipe, a lower outer ring pipe, a lower inner ring pipe, a ring pipe connecting pipe, an outer ring heat exchange pipe, an inner ring heat exchange pipe, an upper inner ring pipe, an upper outer ring pipe and an outlet flange pipe, the lower outer ring pipe is fixedly installed at the output end of the inlet flange pipe, the lower inner ring pipe is arranged on the inner side of the lower outer ring pipe, the outer ring heat exchange pipe is fixedly installed at the top of the lower outer ring pipe, the upper outer ring pipe is fixedly installed at the top of the outer ring heat exchange pipe, the inner ring heat exchange pipe is fixedly installed at the top of the lower inner ring pipe, the upper inner ring pipe is fixedly installed at the top of the inner ring heat exchange pipe, and the outlet flange pipe The input end is fixedly installed on the output end of the upper outer ring pipe, and the ring pipe connecting pipe is respectively fixedly installed on the lower outer ring pipe and the lower inner ring pipe and in the middle of the upper outer ring pipe and the upper inner ring pipe; the gas outlet comprises a seamless steel pipe, a second flange pair, a second stainless steel graphite wound pad, a third stainless steel filter screen, a fourth stainless steel filter screen and a fifth stainless steel filter screen, the fifth stainless steel filter screen is arranged at the bottom of the seamless steel pipe, the fourth stainless steel filter screen is arranged at the bottom of the fifth stainless steel filter screen, the third stainless steel filter screen is arranged at the bottom of the fourth stainless steel filter screen, the second stainless steel graphite wound pad is respectively arranged on the outer sides of the third stainless steel filter screen, the fourth stainless steel filter screen and the fifth stainless steel filter screen, and the second flange pair is arranged on the second stainless steel filter screen. At the bottom of the steel graphite wound gasket, the heat transfer oil inlet and outlet pipes include a welding flange, a fourth seamless steel pipe, a special manhole flange, a high-temperature resistant rubber ring, a special pressure plate flange, fastening bolts, a spring washer and a threaded connection flange. The special manhole flanges are fixedly installed on both sides of the lower tank body, the fourth seamless steel pipe is fixedly installed inside the special manhole flange, the welding flange is fixedly installed at one end of the fourth seamless steel pipe, the threaded connection flange is fixedly installed at the other end of the fourth seamless steel pipe, the high-temperature resistant rubber ring is set on the outer side of the fourth seamless steel pipe, the special pressure plate flange is set on the outer side of the high-temperature resistant rubber ring, the spring washer is set on the outer side of the fastening bolts, and the fastening bolts are respectively set inside the special pressure plate flange; The carbon dioxide buffer gas storage tank 8 includes a gas tank body, a radar level meter, a gas inlet pipe, a gas outlet pipe, an adsorption tower reflux pipe and a gas tank bypass pipe. The radar level meter is arranged on the top of the gas tank body, the gas inlet pipe is arranged at the bottom of one side of the gas tank body, the gas outlet pipe is arranged on the other side of the gas tank body, the adsorption reflux pipe is arranged on one side of the gas outlet pipe, and the two ends of the gas tank bypass pipe are respectively connected to the gas inlet pipe and the gas outlet pipe; the gas tank body includes a gas tank bottom plate, a gas tank side plate, a gas tank top, a central vent, a piston, The rubber film sealing mechanism between the piston and the side plate, the manhole of the gas cabinet side plate, and the piston leveling mechanism are provided. The gas cabinet side plates are provided with four and are fixedly installed around the top of the gas cabinet bottom plate. The top of the gas cabinet bottom plate and one side of the four gas cabinet side plates are fixedly installed with the rubber film sealing mechanism between the piston and the side plate. The inner side of the rubber film sealing mechanism between the piston and the side plate is provided with a piston. The top of the four gas cabinet side plates are fixedly installed with a gas cabinet top. The top of the gas cabinet top is fixedly installed with a central vent hole. The top of the gas cabinet top is provided with a piston. A leveling mechanism, a gas cabinet side panel manhole is fixedly installed on one side of a gas cabinet side panel; the gas inlet pipe includes an air inlet main pipe, a temperature sensor and an air inlet electric butterfly valve, the temperature sensor is fixedly installed on one side of the air inlet main pipe, the air inlet electric butterfly valve is fixedly installed on one end of the air inlet main pipe, and the air inlet electric butterfly valve is fixedly installed on the side of the gas cabinet body; the gas cabinet gas outlet pipe includes an outlet flow regulating valve, a carbon dioxide content analyzer, an outlet gas main pipe and an outlet flow meter, the carbon dioxide content analyzer is fixedly installed on one end of the outlet flow regulating valve, the outlet gas main pipe is fixedly installed on one end of the carbon dioxide content analyzer, and the outlet flow meter is fixedly installed on one end of the outlet gas main pipe; the adsorption tower reflux pipe includes a converging pipe and a reflux pipe electric butterfly valve, the reflux pipe electric butterfly valve is fixedly installed on the side of the gas cabinet body, and the converging pipe is fixedly installed on one end of the reflux pipe electric butterfly valve; the gas cabinet bypass pipe includes a bypass pipe and a bypass pipe electric butterfly valve, the bypass pipe electric butterfly valve is fixedly installed on one end of the bypass pipe, the bypass pipe electric butterfly valve is connected to the gas cabinet gas outlet pipe, and the bypass pipe is connected to the gas inlet pipe; The adsorption tower heat transfer oil heating system 9 includes an upper high-temperature storage tank, a heat transfer oil inlet cut-off valve for the first adsorption tower heat supply jacket, a heat transfer oil inlet cut-off valve for the first adsorption tower heat exchange loop pipe, a heat transfer oil inlet cut-off valve for the second adsorption tower heat supply jacket, and a heat transfer oil inlet cut-off valve for the second adsorption tower heat exchange loop pipe. The upper high-temperature storage tank is connected to a heat transfer oil pump and a pipeline through a pipeline, the heat transfer oil inlet cut-off valve for the first adsorption tower heat supply jacket is connected to the heat transfer oil pump and a pipeline through a pipeline, and the heat transfer oil inlet cut-off valve for the first adsorption tower heat exchange loop pipe is connected to the heat transfer oil pump and a pipeline through a pipeline. The first adsorption tower is connected to the heat transfer oil pump and pipeline, the heat transfer oil inlet cut-off valve of the heat supply jacket of the first adsorption tower is connected to the heat transfer oil pump and pipeline through a pipeline, and the heat transfer oil inlet cut-off valve of the heat transfer loop pipe in the first adsorption tower is connected to the heat transfer oil pump and pipeline through a pipeline; the output ends of the heat transfer oil inlet cut-off valve of the heat supply jacket of the first adsorption tower and the heat transfer oil inlet cut-off valve of the heat transfer loop pipe in the first adsorption tower are provided with the first adsorption tower; the output ends of the heat transfer oil inlet cut-off valve of the heat supply jacket of the first adsorption tower and the heat transfer oil inlet cut-off valve of the heat transfer loop pipe in the first adsorption tower are provided with the first adsorption tower; The adsorption tower cooling system 11 comprises a gas compressor, a carbon dioxide reflux pipeline, a gas compressor outlet pipe, a gas cooler and a gas storage tank. The carbon dioxide reflux pipeline is arranged at the input end of the gas compressor, the gas compressor outlet pipe is arranged at the output end of the gas compressor, the gas cooler is arranged at the output end of the gas compressor outlet pipe, the gas storage tank is arranged at the output end of the gas cooler, and the output end of the gas storage tank is fixedly installed with a gas storage tank outlet pipe; the input end of the gas compressor is fixedly installed with a gas compressor inlet cut-off valve, and the gas compressor inlet cut-off valve is fixedly installed at the output end of the carbon dioxide reflux pipeline; ... A gas compressor outlet shut-off valve is fixedly installed at the outlet end, and the gas compressor outlet shut-off valve is fixedly installed at the input end of the gas compressor outlet pipe; a gas cooler inlet shut-off valve is fixedly installed at the input end of the gas cooler, and the input end of the gas cooler inlet shut-off valve is at the output end of the gas compressor outlet pipe, a gas cooler outlet shut-off valve is fixedly installed at the output end of the gas cooler, and the output end of the gas cooler outlet shut-off valve is fixedly installed at the input end of the gas storage tank; an air inlet shut-off valve connected to the first adsorption tower air inlet tee and an air inlet shut-off valve connected to the first adsorption tower air inlet tee are respectively fixedly installed at the two output ends of the air outlet pipe of the gas storage tank.

[0025] The flue gas pipeline 3 after dust removal, pressurization and cooling includes an air intake main pipe 75, a CO2 content analyzer 76, a variable temperature and pressure adsorption tower air intake branch pipe 77, an adsorption tower A air intake branch pipe electric gate valve 78, a variable temperature and pressure adsorption tower B air intake branch pipe 79, and an adsorption tower B air intake branch pipe electric gate valve 80. The CO2 content analyzer 76 is fixedly installed at one end of the air intake main pipe 75, the variable temperature and pressure adsorption tower air intake branch pipe 77 is fixedly installed at one side of the air intake main pipe 75, and the adsorption tower A air intake branch pipe electric gate valve 80 is fixedly installed at one end of the air intake main pipe 75, and the variable temperature and pressure adsorption tower air intake branch pipe 77 is fixedly installed at one side of the air intake main pipe 75. Valve 78 is fixedly installed on one end of the inlet branch pipe 77 of the temperature-variable pressure swing adsorption tower, the electric gate valve 78 of the inlet branch pipe of the adsorption tower A is fixedly installed on one side of the adsorption tower A1, one end of the inlet branch pipe 79 of the temperature-variable pressure swing adsorption tower B is fixedly installed on the other end of the inlet main pipe 75, the electric gate valve 80 of the inlet branch pipe of the adsorption tower B is fixedly installed on the other end of the inlet branch pipe 79 of the temperature-variable pressure swing adsorption tower B, and the electric gate valve 80 of the inlet branch pipe of the adsorption tower B is fixedly installed on one side of the adsorption tower B2.

[0026] The intake main pipe 75 and the intake branch pipe 77 are made of PE pipes and are hot-melt-jointed; the pipes are connected to the CO2 content analyzer 76 and the intake branch pipe electric gate valve 78 using flange connections; The CO2 content analyzer 76 mainly measures the CO2 content of the inlet flue gas. When the oxygen content is greater than 2%, the electric gate valve 78 of the air intake pipe is allowed to open; The electric gate valve 78 of the air inlet branch pipe of the adsorption tower A1 and the electric gate valve 80 of the air inlet branch pipe of the adsorption tower B2 are interlocked with the electric gate valve 157 of the air inlet branch pipe of the adsorption tower cooling system 11. When the electric gate valve 78 of the air inlet branch pipe of the adsorption tower A1 is opened, the electric gate valve 157 of the air inlet branch pipe of the adsorption tower A1 cooling system 11 is closed, and vice versa. The electric three-way ball valve 4 is arranged at the gas outlet of the adsorption tower, and is a JL900-Q2 electric three-way flange ball valve, that is, the gas outlet side of the adsorption tower is normally open, when the release side is opened, the desorption recovery side is closed, and vice versa.

[0027] The exhaust gas emission pipeline 5 includes an exhaust gas emission main pipe 81, an exhaust gas emission branch pipe 82 of adsorption tower A, an exhaust gas emission CO2 content analyzer 83 of adsorption tower A, an exhaust gas emission branch pipe 84 of adsorption tower B, and an exhaust gas emission CO2 content analyzer 85 of adsorption tower B. The exhaust gas emission CO2 content analyzer 83 of adsorption tower A is arranged on one side of the adsorption tower A1, the exhaust gas emission CO2 content analyzer 85 of adsorption tower B is arranged on one side of the adsorption tower B1, the exhaust gas emission branch pipe 84 of adsorption tower B is fixedly installed on one side of the exhaust gas emission CO2 content analyzer 83 of adsorption tower A, and the exhaust gas emission main pipe 81 is fixedly installed on one end of the exhaust gas emission branch pipe 84 of adsorption tower B.

[0028] The exhaust gas discharge main pipe 81 and the exhaust gas discharge branch pipe 82 are made of PE material and are hot-melt-jointed; the connection with the exhaust gas discharge CO2 content analyzer 83 is flange-connected; When the CO2 content of the exhaust gas emission CO2 content analyzer 83 reaches 25% of the inlet concentration, the adsorption tower should be switched.

[0029] The positive pressure carbon dioxide gas phase pipeline 6 includes an adsorption tower A gas phase carbon dioxide recovery branch pipe 86, a gas phase carbon dioxide recovery main pipe 87, an adsorption tower B gas phase carbon dioxide recovery branch pipe 88, and an electric gate valve 89. The adsorption tower B gas phase carbon dioxide recovery branch pipe 88 is arranged on one side of the adsorption tube B2, and the adsorption tower A gas phase carbon dioxide recovery branch pipe 86 is arranged on one side of the adsorption tube A1.

[0030] The positive pressure carbon dioxide gas phase pipeline 6 is connected to the vacuum pump and the inlet and outlet pipes 7 and the carbon dioxide buffer gas storage tank 8, and the captured carbon dioxide directly enters the buffer gas storage tank 8; The electric gate valve 89 is interlocked with the positive pressure sensor 24 and the negative pressure sensor 25 of the adsorption tower A1 and the adsorption tower B2; when the pressure of the adsorption tower A1 and the adsorption tower B2 is greater than 5kPa, the electric gate valve 89 is in an open state; when the pressure of the adsorption tower A1 and the adsorption tower B2 is less than 5kPa, the electric gate valve 89 is in a closed state.

[0031] The gas phase carbon dioxide recovery main pipe 87 is fixedly installed at one end of the gas phase carbon dioxide recovery branch pipe 86 of the adsorption tower A and the gas phase carbon dioxide recovery branch pipe 88 of the adsorption tower B, and the electric gate valve 89 is fixedly installed at one end of the gas phase carbon dioxide recovery main pipe 87.

[0032] The vacuum pump and inlet and outlet pipes 7 include an inlet pipe 90, an inlet electric gate valve 91, an inlet expansion joint 92, an inlet local negative pressure gauge 93, an inlet pressure sensor 94, a vacuum pump 95, an outlet local pressure gauge 96, an outlet pressure sensor 97, an outlet expansion joint 98, an outlet electric gate valve 99, an outlet pipe 100, a muffler 101, and a vacuum pump bracket 102. The inlet pipe 90 is fixedly installed on one side of the positive pressure carbon dioxide gas phase pipeline 6, the inlet electric gate valve 91 is fixedly installed on the bottom of the inlet pipe 90, the inlet expansion joint 92 is fixedly installed on the bottom of the inlet electric gate valve 91, the inlet pressure sensor 94 is fixedly installed on one side of the inlet expansion joint 92, the inlet local negative pressure gauge 93 is fixedly installed on the other side of the inlet expansion joint 92, the vacuum pump 95 is fixedly installed on the top of the inlet expansion joint 92, and the outlet expansion joint 98 is fixedly installed on the bottom of the vacuum pump 95.

[0033] The vacuum pump and the inlet and outlet pipes 7 are interlocked with the positive pressure sensor 24 and the negative pressure sensor 25 of the adsorption tower. When the pressure of the adsorption tower is less than 5KPa, the vacuum pump 7 starts; when the pressure of the adsorption tower reaches -75kPa, the vacuum pump 7 stops. The inlet electric gate valve 91 and the outlet electric gate valve 99 are interlocked with the vacuum pump 95. When starting, when the vacuum pump 95 operates normally, the inlet electric gate valve 91 and the outlet electric gate valve 99 are opened; when stopping, the inlet electric gate valve 91 and the outlet electric gate valve 99 are closed first, and then the vacuum pump 95 is stopped.

[0034] The outlet on-site pressure gauge 96 is fixedly installed on one side of the outlet expansion joint 98, the outlet pressure sensor 97 is fixedly installed on the other side of the outlet expansion joint 98, the outlet electric gate valve 99 is fixedly installed on the bottom of the outlet expansion joint 98, the vacuum pump bracket 102 is fixedly installed on the bottom of the vacuum pump 95, the outlet pipe 100 is fixedly installed on the bottom of the outlet electric gate valve 99, and the muffler 101 is arranged on the outer side of the outlet pipe 100.

[0035] The heat transfer oil reflux system 10 includes a jacket return oil cut-off valve 134, an adsorption tower A return oil pipeline 135, an adsorption tower B jacket return oil cut-off valve 136, an adsorption tower B return oil pipeline 137, an adsorption tower A jacket unloading oil cut-off valve 138, an adsorption tower A internal heat exchange loop unloading oil cut-off valve 139, an adsorption tower A unloading oil pipeline 140, an adsorption tower B jacket unloading oil cut-off valve 141, an adsorption tower B internal heat exchange loop unloading oil cut-off valve 142, an adsorption tower B unloading oil pipeline 143, an oil return storage tank 144, and an oil return pump 145. 45 and the return oil pipeline 146, the jacket return oil cut-off valve 134 and the adsorption tower A return oil pipeline 135 are both arranged on one side of the adsorption tower A, the jacket return oil cut-off valve 134 is connected to one end of the adsorption tower A return oil pipeline 135, the adsorption tower B jacket return oil cut-off valve 136 and the adsorption tower B return oil pipeline 137 are both arranged on one side of the adsorption tower B, the adsorption tower B jacket return oil cut-off valve 136 is connected to one end of the adsorption tower B return oil pipeline 137.

[0036] The adsorption tower A jacket oil unloading cut-off valve 138, the adsorption tower A internal heat exchange loop oil unloading cut-off valve 139 and the adsorption tower A oil unloading pipeline 140 are connected, and one end of the adsorption tower A jacket oil unloading cut-off valve 138 and the adsorption tower A internal heat exchange loop oil unloading cut-off valve 139 are respectively arranged on both sides of the adsorption tower A1, and the adsorption tower B jacket oil unloading cut-off valve 141, the adsorption tower B internal heat exchange loop oil unloading cut-off valve 142 and the adsorption tower B oil unloading pipeline 140 are respectively arranged on both sides of the adsorption tower A1. The adsorption tower B jacket oil unloading shut-off valve 141 and one end of the adsorption tower B internal heat exchange loop oil unloading shut-off valve 142 are respectively arranged on both sides of the adsorption tower B, the return oil storage tank 144 is respectively connected to the adsorption tower A return oil pipeline 135 and the adsorption tower B return oil pipeline 137, the return oil pump 145 is fixedly installed on one side of the return oil storage tank 144, and the return oil pipeline 146 is fixedly installed on one end of the return oil pump 145.

[0037] Each plane of the concrete foundation and the steel multi-story frame 13 is provided with a level operation platform 159 , and an inclined ladder 160 is provided between each of the level operation platforms 159 .

[0038] The PLC control system 12 is mainly used to remotely and automatically control the carbon dioxide temperature-variable negative pressure adsorption double-tower device for the flue gas of non-ferrous metallurgical furnaces; The concrete foundation and the steel multi-layer frame 13 are the load-bearing supporting structures of the flue gas carbon dioxide variable temperature negative pressure adsorption twin-tower device. The foundation design is determined based on the geological conditions, seismic fortification, device load, and meteorological conditions of the project site; the multi-layer frame is designed with a floor height based on the equipment requirements for the scale of carbon dioxide capture by the flue gas carbon dioxide variable temperature negative pressure adsorption twin-tower device; each level of the frame is provided with a plane 159 required for device operation, and an inclined ladder 160 is provided between each floor for operators to go up and down.

[0039] The working principle of the non-ferrous metallurgical furnace flue gas carbon dioxide variable temperature negative pressure adsorption double tower device provided by the present invention is as follows: Since the flue gas from the dust removal and pressurized cooling system still contains a lot of harmful substances, the adsorption tower A1 and the adsorption tower B2 use a porous aminated carbon-based adsorbent 14, which does not adsorb most harmful substances, but has a strong adsorption capacity for carbon dioxide, so it can be widely used in the capture of carbon dioxide in the flue gas of non-ferrous metallurgical furnaces; the adsorption tower A1 and the adsorption tower B2 are symmetrically arranged on the second layer of the steel multi-layer frame 12, and the third layer is provided with reserved holes at corresponding positions to facilitate the filling of the porous aminated carbon-based adsorbent in the adsorption tower. The porous aminated carbon-based adsorbent is transported in ton bags and lifted by a car crane; the flue gas pipeline 3 after dust removal and pressurized cooling is introduced from the outside of the device, and the gas temperature is required to be less than 10°C. The carbon dioxide gas enters the adsorption tower A1 and the adsorption tower B2 from the bottom, and the carbon dioxide gas is adsorbed by the porous aminated carbon-based adsorbent. The exhaust gas is returned to the original chimney through the electric three-way ball valve 4 and the exhaust gas exhaust pipeline 5 at the top for discharge. When the data measured by the CO2 analyzer in the exhaust gas discharge pipeline 5 is 25% of the imported CO2 content, the device automatically switches from adsorption tower A1 to adsorption tower B2, or from adsorption tower B2 to adsorption tower A1 to adsorb carbon dioxide. The adsorption tower that does not adsorb carbon dioxide is converted to a desorbing carbon dioxide state by the electric three-way ball valve 4. At this time, the positive pressure carbon dioxide gas phase pipeline 6, the adsorption tower thermal oil heating system 9, and the thermal oil reflux system 10 are opened by the PLC control system 12. The corresponding adsorption tower valves, when the network pressure is greater than 5kPa, the carbon dioxide gas directly enters the carbon dioxide buffer gas storage cabinet 8. When the network pressure is less than 5kPa, the vacuum pump and the inlet and outlet pipes 7 start to operate. At this time, the PLC interlocking must be set according to the vacuum pump operating instructions. When the pressure in the adsorption tower is -75 kPa, stop the desorption of carbon dioxide in the adsorption tower; the operating temperature of the heat transfer oil of the heat transfer oil heating system 9 of the adsorption tower is designed to be 200°C, the heat transfer oil heating system 9 and the heat transfer oil reflux system 10 continue to operate during the desorption process of the adsorption tower, and return the heat transfer oil after heat exchange to the solar heat transfer oil heating device; after the desorption is completed, the adsorption tower is cooled by the adsorption tower cooling system 11; the adsorption tower cooling system 11 is used to cool the adsorption tower after the desorption of the adsorption tower is completed, so as to achieve a good carbon dioxide adsorption effect of the adsorption tower.

[0040] Compared with the related art, the non-ferrous metallurgical furnace flue gas carbon dioxide temperature variable negative pressure adsorption double tower device provided by the present invention has the following beneficial effects: By using flue gas carbon dioxide variable temperature negative pressure adsorption double towers as the main body of the capture device, each adsorption tower is provided with a flue gas inlet, an adsorption tank filled with a porous aminated carbon-based adsorbent, a heat transfer oil heating device arranged in the adsorption tank, an exhaust gas discharge device, a carbon dioxide variable temperature and pressure negative pressure recovery pipeline, a heat transfer oil heating system, and an adsorption tower cooling system. The adsorption double towers are arranged in a steel structure frame, and the captured carbon dioxide gas passes through the variable temperature and pressure negative pressure recovery pipeline and enters the carbon dioxide gas phase storage cabinet. The exhaust gas of the device passes through the discharge device and returns to the original flue gas discharge chimney, which effectively improves the capture efficiency of carbon dioxide; Through the synergistic effect of optimized adsorption tower structure and efficient thermal oil heating device and cooling system, the problem of low capture efficiency of traditional devices under complex flue gas conditions has been overcome, providing a strong guarantee for the reduction of carbon dioxide emissions from metallurgical furnaces. At the same time, reasonable design has also extended the service life of the equipment, reduced energy consumption, and improved the level of carbon dioxide resource utilization in metallurgical furnaces, effectively alleviating the severe emission reduction situation. In addition, the device occupies a small area and achieves efficient carbon dioxide capture function in a limited space, minimizing the possibility of environmental pollution. It has low construction investment, which reduces the cost burden for enterprises. It is also flexible to use and can be adjusted and optimized according to different production needs and flue gas conditions, adapting to various complex non-ferrous metallurgical production scenarios.

[0041] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of non-ferrous metallurgical furnaces, characterized in that: include: Adsorption tower A, adsorption tower B, flue gas pipeline after dust removal, pressurization and cooling, electric three-way ball valve, exhaust gas discharge pipeline, positive pressure carbon dioxide gas pipeline, vacuum pump and inlet and outlet pipes, carbon dioxide buffer gas storage cabinet, adsorption tower thermal oil heating system, thermal oil reflux system, adsorption tower cooling system, PLC control system, concrete foundation and steel multi-layer frame; The output ends of the flue gas pipeline after dust removal, pressurization and cooling are respectively fixedly installed at the bottom of the adsorption tower A and the adsorption tower B, the electric three-way ball valve is respectively fixedly installed at the top of the adsorption tower A and the adsorption tower B, the exhaust gas discharge pipeline is fixedly installed at the output end of the electric three-way ball valve, the positive pressure carbon dioxide gas phase pipeline is respectively arranged at the top of the adsorption tower A and the adsorption tower B, the adsorption tower heat transfer oil heating system is respectively arranged at the top of the adsorption tower A and the adsorption tower B, the heat transfer oil reflux system is respectively arranged on the side of the adsorption tower A and the adsorption tower B, the PLC control system is arranged on one side of the adsorption tower B, the carbon dioxide buffer gas storage cabinet is arranged at the bottom of the PLC control system, and the vacuum pump and the inlet and outlet pipes are arranged on one side of the carbon dioxide buffer gas storage cabinet; The heat transfer oil working temperature of the heat transfer oil heating system of the adsorption tower is designed to be 200°C. The heat transfer oil heating system and the heat transfer oil reflux system continue to operate during the desorption process of the adsorption tower, and return the heat transfer oil after heat exchange to the solar heat transfer oil heating device; after the desorption is completed, the adsorption tower is cooled by the adsorption tower cooling system 11; The adsorption tower cooling system is used to cool the adsorption tower after desorption of the adsorption tower is completed, so as to achieve a good carbon dioxide adsorption effect of the adsorption tower.

2. According to claim 1, a non-ferrous metallurgical furnace flue gas carbon dioxide temperature variable negative pressure adsorption double tower device is characterized in that: The flue gas duct after dust removal and pressurized cooling includes an air intake main pipe, a CO2 content analyzer, a variable temperature and pressure swing adsorption tower air intake branch pipe, an electric gate valve for the air intake branch pipe of adsorption tower A, a variable temperature and pressure swing adsorption tower B air intake branch pipe, and an electric gate valve for the air intake branch pipe of adsorption tower B. The CO2 content analyzer is fixedly installed at one end of the air intake main pipe, the air intake branch pipe of the variable temperature and pressure swing adsorption tower is fixedly installed at one side of the air intake main pipe, the electric gate valve for the air intake branch pipe of adsorption tower A is fixedly installed at one end of the air intake branch pipe of the variable temperature and pressure swing adsorption tower, the electric gate valve for the air intake branch pipe of adsorption tower A is fixedly installed at one side of the adsorption tower A, one end of the air intake branch pipe of the variable temperature and pressure swing adsorption tower B is fixedly installed at the other end of the air intake main pipe, the electric gate valve for the air intake branch pipe of adsorption tower B is fixedly installed at the other end of the air intake branch pipe of the variable temperature and pressure swing adsorption tower B, and the electric gate valve for the air intake branch pipe of adsorption tower B is fixedly installed at one side of the adsorption tower B.

3. According to claim 1, a non-ferrous metallurgical furnace flue gas carbon dioxide temperature variable negative pressure adsorption double tower device is characterized in that: The exhaust gas emission pipeline includes an exhaust gas emission main pipe, an exhaust gas emission branch pipe of adsorption tower A, an exhaust gas emission CO2 content analyzer of adsorption tower A, an exhaust gas emission branch pipe of adsorption tower B, and an exhaust gas emission CO2 content analyzer of adsorption tower B. The exhaust gas emission CO2 content analyzer of adsorption tower A is arranged on one side of the adsorption tower A, and the exhaust gas emission CO2 content analyzer of adsorption tower B is arranged on one side of the adsorption tower B. The exhaust gas emission branch pipe of adsorption tower B is fixedly installed on one side of the exhaust gas emission CO2 content analyzer of adsorption tower A, and the exhaust gas emission main pipe is fixedly installed on one end of the exhaust gas emission branch pipe of adsorption tower B.

4. According to claim 1, a non-ferrous metallurgical furnace flue gas carbon dioxide temperature variable negative pressure adsorption double tower device is characterized in that: The positive pressure carbon dioxide gas phase pipeline includes a gas phase carbon dioxide recovery branch pipe of adsorption tower A, a gas phase carbon dioxide recovery main pipe, a gas phase carbon dioxide recovery branch pipe of adsorption tower B, and an electric gate valve. The gas phase carbon dioxide recovery branch pipe of adsorption tower B is arranged on one side of the adsorption tube B, and the gas phase carbon dioxide recovery branch pipe of adsorption tower A is arranged on one side of the adsorption tube A.

5. A non-ferrous metallurgical furnace flue gas carbon dioxide temperature variable negative pressure adsorption double tower device according to claim 4, characterized in that: The gas phase carbon dioxide recovery main pipe is fixedly installed on one end of the gas phase carbon dioxide recovery branch pipe of the adsorption tower A and the gas phase carbon dioxide recovery branch pipe of the adsorption tower B, and the electric gate valve is fixedly installed on one end of the gas phase carbon dioxide recovery main pipe.

6. A non-ferrous metallurgical furnace flue gas carbon dioxide temperature variable negative pressure adsorption double tower device according to claim 1, characterized in that: The vacuum pump and inlet and outlet pipes include an inlet pipe, an inlet electric gate valve, an inlet expansion joint, an inlet local negative pressure gauge, an inlet pressure sensor, a vacuum pump, an outlet local pressure gauge, an outlet pressure sensor, an outlet expansion joint, an outlet electric gate valve, an outlet pipe, a muffler, and a vacuum pump bracket. The inlet pipe is fixedly installed on one side of the positive pressure carbon dioxide gas phase pipeline, the inlet electric gate valve is fixedly installed on the bottom of the inlet pipe, the inlet expansion joint is fixedly installed on the bottom of the inlet electric gate valve, the inlet pressure sensor is fixedly installed on one side of the inlet expansion joint, the inlet local negative pressure gauge is fixedly installed on the other side of the inlet expansion joint, the vacuum pump is fixedly installed on the top of the inlet expansion joint, and the outlet expansion joint is fixedly installed on the bottom of the vacuum pump.

7. A non-ferrous metallurgical furnace flue gas carbon dioxide temperature variable negative pressure adsorption double tower device according to claim 6, characterized in that: The outlet on-site pressure gauge is fixedly installed on one side of the outlet expansion joint, the outlet pressure sensor is fixedly installed on the other side of the outlet expansion joint, the outlet electric gate valve is fixedly installed on the bottom of the outlet expansion joint, the vacuum pump bracket is fixedly installed on the bottom of the vacuum pump, the outlet pipe is fixedly installed on the bottom of the outlet electric gate valve, and the muffler is arranged on the outer side of the outlet pipe.

8. The non-ferrous metallurgical furnace flue gas carbon dioxide temperature variable negative pressure adsorption double tower device according to claim 1, characterized in that: The heat transfer oil reflux system includes a jacket return oil cut-off valve, an adsorption tower A return oil pipeline, an adsorption tower B jacket return oil cut-off valve, an adsorption tower B return oil pipeline, an adsorption tower A jacket unloading oil cut-off valve, an adsorption tower A internal heat exchange loop unloading oil cut-off valve, an adsorption tower A unloading oil pipeline, an adsorption tower B jacket unloading oil cut-off valve, an adsorption tower B internal heat exchange loop unloading oil cut-off valve, an adsorption tower B unloading oil pipeline, a return oil storage tank, an oil return pump and an oil return pipeline. The jacket return oil cut-off valve and the adsorption tower A return oil pipeline are both arranged on one side of the adsorption tower A, and the jacket return oil cut-off valve is connected to one end of the adsorption tower A return oil pipeline. The adsorption tower B jacket return oil cut-off valve and the adsorption tower B return oil pipeline are both arranged on one side of the adsorption tower B, and the adsorption tower B jacket return oil cut-off valve is connected to one end of the adsorption tower B return oil pipeline.

9. A double-tower device for temperature-variable negative pressure adsorption of carbon dioxide from flue gas of non-ferrous metallurgical furnace according to claim 8, characterized in that: The adsorption tower A jacket oil unloading cut-off valve, the adsorption tower A internal heat exchange loop oil unloading cut-off valve and the adsorption tower A oil unloading pipeline are connected, and one end of the adsorption tower A jacket oil unloading cut-off valve and the adsorption tower A internal heat exchange loop oil unloading cut-off valve are respectively arranged on both sides of the adsorption tower A, the adsorption tower B jacket oil unloading cut-off valve, the adsorption tower B internal heat exchange loop oil unloading cut-off valve and the adsorption tower B oil unloading pipeline are connected, and one end of the adsorption tower B jacket oil unloading cut-off valve and the adsorption tower B internal heat exchange loop oil unloading cut-off valve are respectively arranged on both sides of the adsorption tower B, the return oil storage tank is respectively connected to the adsorption tower A return oil pipeline and the adsorption tower B return oil pipeline, the return oil pump is fixedly installed on one side of the return oil storage tank, and the return oil pipeline is fixedly installed on one end of the return oil pump.

10. The non-ferrous metallurgical furnace flue gas carbon dioxide temperature variable negative pressure adsorption double tower device according to claim 1, characterized in that: Each plane of the concrete foundation and the steel multi-story frame is provided with a level operation platform, and an inclined ladder is provided between each of the level operation platforms.

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