A method for extracting high-purity carbon dioxide from a cement kiln system

Abstract

The invention discloses a method for extracting high-purity carbon dioxide from a cement kiln system, and relates to the technical field of cement industry. The method is implemented based on a cement kiln system, and the cement kiln system comprises a cement kiln, a combustion decomposition furnace, a grate cooler, a preheating mechanism, a gas heating mechanism, a cold smoke chamber, a sealed feeder, a feeding pipeline, an ascending flue, a tertiary air duct, a flue gas conveying pipeline, a carbon dioxide conveying pipeline and a heat exchange pipeline. The invention provides a gas heating mechanism on a system for extracting high-purity carbon dioxide from a cement kiln, and a gas heater is provided inside the gas heating mechanism. An intermittent opening and closing component and a matching pressurizing component are provided on a bearing shell outside the gas heater. The gas heater is provided with a medium flow pipe B in an 8-shaped surrounding shape, so that the temperature of the part is relatively high, and the heating efficiency is improved. The heated gas is pressurized by matching the pressurizing component, and its heating time is further shortened, thereby significantly improving the operation efficiency of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of cement industry, and more particularly to a method for extracting high-purity carbon dioxide from a cement kiln system. Background Art

[0002] In the cement production process, the waste gas emitted by the cement kiln system is rich in carbon dioxide (CO2), and the emission of these CO2 poses a severe challenge to global warming. Therefore, extracting and recycling these CO2 has become a key link in the green development of the cement industry. With the increasing requirements of the state for energy conservation and clean production in the chemical industry, as well as the continuous rise in energy prices, how to effectively reduce the energy consumption of equipment production and ensure the quality of raw materials has become a problem that production companies need to solve urgently.

[0003] In order to maintain a good atmospheric environment and reduce production costs, adding carbon dioxide recycling equipment has become an inevitable choice for related production companies. However, the existing method of directly extracting high-purity CO2 in the cement kiln system through electromagnetic heaters has significant resource consumption problems, which is obviously contrary to the goal of energy saving and consumption reduction.

[0004] Specifically, the electromagnetic heating process consumes a lot of electricity, especially when heating CO2 to a high temperature, the energy consumption increases sharply. This not only pushes up production costs, but also increases the burden on the power grid and hinders the efficient use of energy. In addition, when part of the electrical energy is converted into thermal energy, the conversion efficiency is not ideal, resulting in a large amount of electrical energy being lost to the environment in the form of thermal energy, which not only wastes resources but also aggravates the problem of thermal pollution. Furthermore, electromagnetic heating equipment is usually expensive and has high requirements for equipment maintenance and operating environment. Long-term operation can easily lead to equipment wear and frequent failures, further increasing maintenance costs and production risks.

[0005] In summary, the method of heating CO2 in the cement kiln system based on an external electromagnetic heater to extract high-purity CO2 has significant resource waste and environmental problems. In contrast, the gas heating method has shown significant advantages in energy efficiency, operating costs and environmental benefits. In view of this, we proposed a new method for extracting high-purity carbon dioxide in the cement kiln system that is more efficient and energy-saving. Summary of the invention

[0006] The object of the present invention is to provide a method for extracting high-purity carbon dioxide from a cement kiln system to solve the above technical problems.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for extracting high-purity carbon dioxide from a cement kiln system, the method is implemented based on a device for extracting high-purity carbon dioxide from a cement kiln system, wherein the device for extracting high-purity carbon dioxide from a cement kiln system comprises a cement kiln, a combustion decomposition furnace, a grate cooler, a preheating mechanism, a gas heating mechanism, a cold smoke chamber, a sealed feeder, a feed pipe, an ascending flue, a tertiary air duct, a flue gas conveying pipe, a carbon dioxide conveying pipe and a heat exchange pipe;

[0008] The feed pipe is connected to the preheating mechanism, the outlet of the preheating mechanism is connected to the cement kiln through the sealed feeder, the smoke cooling chamber is arranged on the cement kiln, the cement kiln is connected to the combustion decomposition furnace through the ascending flue, the combustion decomposition furnace is connected to the gas heating mechanism through the input end of the carbon dioxide delivery pipe, the output end of the carbon dioxide delivery pipe is connected to the preheating mechanism, the combustion decomposition furnace is connected to the grate cooler through the tertiary air duct, the combustion decomposition furnace is connected to the preheating mechanism through the flue gas delivery pipe, and the gas heating mechanism is arranged around the feed pipe through the heat exchange pipe;

[0009] The gas heating mechanism includes a gas heater, a high-temperature dust collector and a waste heat boiler, the carbon dioxide delivery pipeline is connected to the high-temperature dust collector, the discharge end of the high-temperature dust collector is connected to the gas heater, the gas outlet end of the high-temperature dust collector is connected to the waste heat boiler, and the output end of the gas heater is connected to the combustion decomposition furnace;

[0010] Preferably, a bearing shell is provided on the outside of the gas heater, an inlet and outlet pipe is provided on the bearing shell, an intermittent opening and closing component is provided at one end of the bearing shell near the inlet and outlet pipe, and a matching pressurizing component is provided at one end of the bearing shell away from the intermittent opening and closing component.

[0011] Preferably, the gas heater includes a gas delivery pipe, an ignition heater, a medium flow pipe A, a medium flow pipe B and an installation inner frame, the installation inner frame is arranged inside the bearing shell near the position of the mating pressurizing component, the gas delivery pipe is arranged at one end of the installation inner frame, the ignition heater is arranged at the output end of the gas delivery pipe, the medium flow pipe A is arranged at one end of the installation inner frame away from the gas delivery pipe, and the medium flow pipe B is connected to the medium flow pipe A.

[0012] Preferably, the medium circulation pipe A and the medium circulation pipe B are connected to each other, the medium circulation pipe A is in a straight pipe shape, and the medium circulation pipe B is in an 8-shaped surrounding shape.

[0013] Preferably, the bearing shell is provided with an installation hole A at one end near the inlet and outlet pipes, the bearing shell is provided with an installation hole B near the bottom of the installation hole A, the bearing shell is provided with an air inlet hole near the bottom of the installation hole B, and the bearing shell is further provided with an air outlet hole near one side of the air inlet hole. The intermittent opening and closing component is installed on the installation hole A and the installation hole B, and the inlet and outlet pipes are connected to the air inlet hole and the air outlet hole.

[0014] Preferably, the intermittent opening and closing component includes a heat insulation card plate, a dual-axis motor, an incomplete gear, a complete gear, an opening and closing blade and an output shaft rod. The heat insulation card plate is arranged inside the bearing shell, and the dual-axis motor is installed on the heat insulation card plate. The incomplete gear is rotatably connected to the mounting through hole A, and the end of the incomplete gear away from the mounting through hole A is connected to the output end of the dual-axis motor, and the complete gear is rotatably connected to the mounting through hole B. The incomplete gear is meshed with the complete gear, and the opening and closing blade is connected to one end of the complete gear close to the inlet and outlet pipe, and the output shaft rod is connected to the output end of the dual-axis motor away from the incomplete gear, and the end of the output shaft rod away from the dual-axis motor is connected to the mating pressurizing component.

[0015] Preferably, the mating pressurizing assembly includes a pressurizing shell, a pressurizing chamber, a first crankshaft, a second crankshaft, a pressurizing piston, a worm and a worm wheel. The pressurizing shell is symmetrically arranged inside the bearing shell near the bottom of the gas heater. The pressurizing chamber is opened inside the pressurizing shell. The first crankshaft and the second crankshaft are rotatably connected to the inner wall of the bearing shell. One end of the pressurizing piston is connected to the first crankshaft and the second crankshaft, and the other end of the pressurizing piston is movably inserted in the pressurizing chamber. The worm wheel is connected between the first crankshaft and the second crankshaft, one end of the worm wheel is connected to the output shaft, and the bottom end of the worm wheel is meshingly connected to the worm wheel.

[0016] Preferably, there is a gap between the first crankshaft and the second crankshaft rotating section, and the pressurizing chamber is located directly below the plurality of medium flow pipes B.

[0017] The present invention provides a method for extracting high-purity carbon dioxide from a cement kiln system, comprising the following steps:

[0018] S1, preheating operation;

[0019] The raw material enters the preheating mechanism through the feeding pipe for preliminary preheating and then enters the cement kiln through the sealed feeder;

[0020] S2, calcination operation;

[0021] The raw material preheated by the preheating mechanism enters the cement kiln to be calcined into cement clinker;

[0022] S3, extraction operation;

[0023] The carbon dioxide gas generated during the calcination of raw materials in the cement kiln enters the combustion decomposition furnace through the ascending flue. The carbon dioxide is transported to the high-temperature dust collector of the gas heating mechanism through the carbon dioxide transmission pipeline for separation. Part of the carbon dioxide enters the waste heat boiler and is collected and stored after waste heat.

[0024] S4, reuse operation;

[0025] The remaining carbon dioxide enters through the inlet and outlet pipes of the gas heating mechanism, and one of the output ends of the dual-axis motor drives the incomplete gear to rotate. The incomplete gear intermittently meshes with the complete gear so that the complete gear intermittently rotates, and the complete gear drives the opening and closing blades to intermittently rotate, so that the air inlet hole is opened and the air outlet hole is closed, and the carbon dioxide enters the pressurized chamber of the pressurized shell. At the same time, the other output end of the dual-axis motor drives the output shaft to rotate, the output shaft drives the worm to rotate, the worm drives the worm wheel to rotate, and the worm wheel drives the first crankshaft and the second crankshaft on both sides to rotate. The first crankshaft and the second crankshaft drive the pressurization piston to move and pressurize in the pressurized shell, so that the gas inside the pressurized chamber is squeezed. At this time, the gas is pumped into the gas delivery pipe, and the ignition heater ignites it to heat the fluid medium in the medium circulation pipe A and the medium circulation pipe B. Since the pressurized chamber is located directly below the medium circulation pipe B, the carbon dioxide is efficiently heated and then enters the combustion decomposition furnace for circulation again;

[0026] S5, residual heat treatment operation;

[0027] The fluid medium in the medium flow pipe A and the medium flow pipe B heated by the gas pumped into the gas heating mechanism once flows through the heat exchange pipe wound around the feed pipe, and the residual heat is utilized again.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention sets a gas heating mechanism on a system for extracting high-purity carbon dioxide from a cement kiln, sets a gas heater inside the gas heating mechanism, and sets an intermittent opening and closing component and a matching pressurizing component on the outer bearing shell of the gas heater. The gas heater is provided with a medium flow pipe B in an 8-shaped surrounding shape, so that the temperature of this part is higher and the heating efficiency is improved. Then, the heated gas is pressurized by the matching pressurizing component, so that the heating time is further shortened, and the system operation efficiency is significantly improved.

[0030] 2. In the present invention, an inner mounting frame is provided inside the carrier shell, and a gas delivery pipe and an ignition heater are provided on the inner mounting frame. After the gas is input through the gas delivery pipe, it is ignited by the ignition heater to burn and heat the medium flowing in the medium flow pipe A and the medium flow pipe B. Since the medium flow pipe A is in a straight pipe shape and the medium flow pipe B is in an 8-shaped surrounding shape, the heated medium flows in the medium flow pipe B for a longer time, so that the local temperature of the area where the medium flow pipe B is located is higher, and its heating efficiency is also higher. Compared with the existing electromagnetic heating method, the use of gas heating not only has a higher heating efficiency, but also has better economic and environmental benefits, which is beneficial for enterprises to save costs while responding to energy conservation and emission reduction.

[0031] 3. In the present invention, when driving the dual-axis motor, the output end of the dual-axis motor away from the incomplete gear drives the output shaft to rotate, the output shaft drives the worm to rotate, the worm drives the worm wheel to rotate, the worm wheel drives the first crankshaft and the second crankshaft on both sides to rotate, the first crankshaft and the second crankshaft drive the pressurizing piston to move and pressurize in the pressurizing shell, so that the gas inside the pressurizing chamber is squeezed, and this part of the gas is located directly below the medium circulation pipe B, so that its thermal conductivity efficiency is greatly improved, thereby further improving the extraction efficiency of carbon dioxide, which is beneficial to improving energy utilization efficiency and further reducing enterprise costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the gas heater of the present invention;

[0033] Figure 2 It is a schematic diagram of the internal structure of the gas heater of the present invention;

[0034] Figure 3 It is a schematic diagram of the structure of the intermittent opening and closing component and the matching pressurizing component of the present invention;

[0035] Figure 4 This is a schematic diagram of the split structure of the matching pressurizing component of the present invention;

[0036] Figure 5 It is a schematic cross-sectional view of the structure of the matching pressurizing assembly of the present invention;

[0037] Figure 6 It is a schematic diagram of the top view of the intermittent opening and closing assembly and the matching pressurizing assembly of the present invention;

[0038] Figure 7 It is a schematic diagram of the structure of the load-bearing housing and the intermittent opening and closing assembly of the present invention;

[0039] Figure 8 The flow chart of extracting high-purity carbon dioxide from the cement kiln system of the present invention;

[0040] Description of the numbers in the figure:

[0041] 1. Cement kiln; 2. Combustion decomposition furnace; 3. Grate cooler; 4. Preheating mechanism; 5. Gas heating mechanism; 6. Cold smoke chamber; 7. Sealed feeder; 8. Feeding pipe; 9. Rising flue; 10. Tertiary air duct; 11. Smoke conveying pipe; 12. Carbon dioxide conveying pipe; 13. Heat exchange pipe;

[0042] 501, gas heater; 502, high temperature dust collector; 503, waste heat boiler; 504, load-bearing shell; 505, inlet and outlet pipes; 506, intermittent opening and closing components; 507, matching pressurizing components;

[0043] 5011, gas delivery pipe; 5012, ignition heater; 5013, medium flow pipe A; 5014, medium flow pipe B; 5015, installation inner frame;

[0044] 5041, mounting through hole A; 5042, mounting through hole B; 5043, air inlet; 5044, air outlet;

[0045] 5061, heat insulation card; 5062, double-axis motor; 5063, incomplete gear; 5064, complete gear; 5065, opening and closing blade; 5066, output shaft;

[0046] 5071, pressurized shell; 5072, pressurized chamber; 5073, first crankshaft; 5074, second crankshaft; 5075, pressurized piston; 5076, worm; 5077, worm wheel. DETAILED DESCRIPTION

[0047] In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described in conjunction with the accompanying drawings of the specification.

[0048] Example 1

[0049] like Figures 1 to 8As shown, the present invention provides a device for extracting high-purity carbon dioxide from a cement kiln system, comprising a cement kiln 1, a combustion decomposition furnace 2, a grate cooler 3, a preheating mechanism 4, a gas heating mechanism 5, a cold smoke chamber 6, a sealed feeder 7, a feed pipe 8, an ascending flue 9, a tertiary air duct 10, a flue gas delivery pipe 11, a carbon dioxide delivery pipe 12 and a heat exchange pipe 13; the feed pipe 8 is connected to the preheating mechanism 4, the outlet of the preheating mechanism 4 is connected to the cement kiln 1 through the sealed feeder 7, the cold smoke chamber 6 is arranged on the cement kiln 1, the cement kiln 1 is connected to the combustion decomposition furnace 2 through the ascending flue 9, the combustion decomposition furnace 2 is connected to the gas heating mechanism 5 through the input end of the carbon dioxide delivery pipe 12, The output end of the carbon dioxide delivery pipeline 12 is connected to the preheating mechanism 4, the combustion decomposition furnace 2 is connected to the grate cooler 3 through the tertiary air duct 10, the combustion decomposition furnace 2 is connected to the preheating mechanism 4 through the flue gas delivery pipeline 11, and the gas heating mechanism 5 is wound around the feed pipeline 8 through the heat exchange pipeline 13; the gas heating mechanism 5 includes a gas heater 501, a high-temperature dust collector 502 and a waste heat boiler 503, the carbon dioxide delivery pipeline 12 is connected to the high-temperature dust collector 502, the discharge end of the high-temperature dust collector 502 is connected to the gas heater 501, the gas outlet end of the high-temperature dust collector 502 is connected to the waste heat boiler 503, and the output end of the gas heater 501 is connected to the combustion decomposition furnace 2. The present invention arranges a gas heating mechanism 5 on a system for extracting high-purity carbon dioxide from a cement kiln, and arranges a gas heater 501 inside the gas heating mechanism 5. An intermittent opening and closing component 506 and a matching pressurizing component 507 are arranged on a supporting shell 504 outside the gas heater 501. The gas heater 501 is provided with a medium flow pipe B5014 in an 8-shaped surrounding shape, so that the temperature of this part is higher and the heating efficiency is improved. The heated gas is pressurized by the matching pressurizing component 507, so that its heating time is further shortened, thereby significantly improving the system operation efficiency.

[0050] In the embodiment of the present invention, a bearing shell 504 is provided on the outside of the gas heater 501, an inlet and outlet pipe 505 is provided on the bearing shell 504, an intermittent opening and closing component 506 is provided at one end of the bearing shell 504 near the inlet and outlet pipe 505, and a matching pressurizing component 507 is provided at one end of the bearing shell 504 away from the intermittent opening and closing component 506. In the present invention, a bearing shell 504 is coated on the outside of the gas heater 501, an inlet and outlet pipe 505 is provided on the bearing shell 504, and the inlet and outlet pipe 505 is connected to the combustion decomposition furnace 2 and the preheating mechanism 4 respectively, an intermittent opening and closing component 506 is provided at one end of the bearing shell 504, and a matching pressurizing component 507 is provided at the other end. When the intermittent opening and closing component 506 is intermittently opened and closed, the matching pressurizing component 507 pressurizes the gas at the same time, so that the heating efficiency is improved, which is conducive to improving the carbon dioxide extraction rate.

[0051] In the embodiment of the present invention, the gas heater 501 includes a gas delivery pipe 5011, an ignition heater 5012, a medium flow pipe A5013, a medium flow pipe B5014 and an installation inner frame 5015. The installation inner frame 5015 is arranged inside the bearing shell 504 near the position of the matching pressurizing component 507, the gas delivery pipe 5011 is arranged at one end of the installation inner frame 5015, the ignition heater 5012 is arranged at the output end of the gas delivery pipe 5011, the medium flow pipe A5013 is arranged at one end of the installation inner frame 5015 away from the gas delivery pipe 5011, and the medium flow pipe B5014 is connected to the medium flow pipe A5013. The medium flow pipe A5013 and the medium flow pipe B5014 are connected to each other, the medium flow pipe A5013 is in a straight pipe shape, and the medium flow pipe B5014 is in an 8-shaped surrounding shape.

[0052] In the present invention, an inner mounting frame 5015 is provided inside the carrier shell 504, and a gas delivery pipe 5011 and an ignition heater 5012 are provided on the inner mounting frame 5015. After the gas is input through the gas delivery pipe 5011, it is ignited by the ignition heater 5012 to burn and heat the medium flowing in the medium flow pipe A5013 and the medium flow pipe B5014. Since the medium flow pipe A5013 is in a straight pipe shape and the medium flow pipe B5014 is in an 8-shaped surrounding shape, the heated medium flows in the medium flow pipe B5014 for a longer time, so that the local temperature of the area where the medium flow pipe B5014 is located is higher, and its heating efficiency is also higher. Compared with the existing electromagnetic heating method, the use of gas heating not only has higher heating efficiency, but also has better economic and environmental benefits, which is beneficial for enterprises to save costs while responding to energy conservation and emission reduction.

[0053] As another embodiment of the present invention, a mounting through hole A5041 is provided at one end of the bearing shell 504 near the inlet and outlet pipe 505, a mounting through hole B5042 is provided at the bottom of the bearing shell 504 near the mounting through hole A5041, an air inlet hole 5043 is provided at a position below the mounting through hole B5042 of the bearing shell 504, and an air outlet hole 5044 is provided at a position on the side of the bearing shell 504 near the air inlet hole 5043. The intermittent opening and closing component 506 is installed on the mounting through hole A5041 and the mounting through hole B5042, and the inlet and outlet pipe 505 is connected to the air inlet hole 5043 and the air outlet hole 5044.

[0054] As another embodiment of the present invention, the intermittent opening and closing component 506 includes a heat-insulating card plate 5061, a dual-axis motor 5062, an incomplete gear 5063, a complete gear 5064, an opening and closing blade 5065 and an output shaft 5066. The heat-insulating card plate 5061 is arranged inside the bearing shell 504, the dual-axis motor 5062 is installed on the heat-insulating card plate 5061, the incomplete gear 5063 is rotatably connected to the mounting through hole A5041, and the incomplete gear 5063 is away from the mounting through hole A5041. One end is connected to the output end of the dual-axis motor 5062, the complete gear 5064 is rotatably connected to the mounting through hole B5042, the incomplete gear 5063 is meshed with the complete gear 5064, the opening and closing blade 5065 is connected to the end of the complete gear 5064 close to the inlet and outlet pipe 505, the output shaft 5066 is connected to the output end of the dual-axis motor 5062 away from the incomplete gear 5063, and the end of the output shaft 5066 away from the dual-axis motor 5062 is connected to the mating pressurizing assembly 507. In the present invention, a heat-insulating card plate 5061 is arranged inside the bearing shell 504, and a dual-axis motor 5062 is arranged on the heat-insulating card plate 5061. When the dual-axis motor 5062 is driven, one of the output ends of the dual-axis motor 5062 drives the incomplete gear 5063 to rotate, and the incomplete gear 5063 is intermittently meshed with the complete gear 5064 so that the complete gear 5064 rotates intermittently, and the complete gear 5064 drives the opening and closing blades 5065 to rotate intermittently, and the other output end of the dual-axis motor 5062 drives the pressurizing component 507 to perform synchronous pressurization, so that the carbon dioxide in the cement kiln system can be extracted more efficiently and energy-savingly.

[0055] As another embodiment of the present invention, the pressurizing assembly 507 includes a pressurizing shell 5071, a pressurizing chamber 5072, a first crankshaft 5073, a second crankshaft 5074, a pressurizing piston 5075, a worm 5076 and a worm wheel 5077. The pressurizing shell 5071 is symmetrically arranged inside the bearing shell 504 near the position below the gas heater 501, the pressurizing chamber 5072 is opened inside the pressurizing shell 5071, the first crankshaft 5073 and the second crankshaft 5074 are connected to each other, and the pressurizing piston 5075 is connected to the second crankshaft 5076. The shaft 5074 is rotatably connected to the inner wall of the bearing housing 504, one end of the pressurizing piston 5075 is connected to the first crankshaft 5073 and the second crankshaft 5074, the other end of the pressurizing piston 5075 is movably inserted in the pressurizing chamber 5072, the worm gear 5077 is connected between the first crankshaft 5073 and the second crankshaft 5074, one end of the worm gear 5077 is connected to the output shaft 5066, and the bottom end of the worm gear 5077 is meshedly connected to the worm gear 5077. There is a gap between the rotating sections of the first crankshaft 5073 and the second crankshaft 5074, and the pressurizing chamber 5072 is located directly below a plurality of medium flow pipes B5014. In the present invention, when driving the dual-axis motor 5062, the output end of the dual-axis motor 5062 away from the incomplete gear 5063 drives the output shaft 5066 to rotate, the output shaft 5066 drives the worm 5076 to rotate, the worm 5076 drives the worm wheel 5077 to rotate, the worm wheel 5077 drives the first crankshaft 5073 and the second crankshaft 5074 on both sides to rotate, the first crankshaft 5073 and the second crankshaft 5074 drive the pressurizing piston 5075 to move and pressurize in the pressurizing shell 5071, so that the gas inside the pressurizing chamber 5072 is squeezed, and this part of the gas is located directly below the medium circulation pipe B5014, so that its thermal conductivity efficiency is greatly improved, thereby further improving the extraction efficiency of carbon dioxide, which is beneficial to improving energy utilization efficiency and further reducing enterprise costs.

[0056] Example 2

[0057] The present invention provides a method for extracting high-purity carbon dioxide from a cement kiln system according to Embodiment 1, comprising the following steps:

[0058] S1, preheating operation;

[0059] The raw material enters the preheating mechanism 4 through the feed pipe 8 for preliminary preheating and then enters the cement kiln 1 through the sealed feeder 7;

[0060] S2, calcination operation;

[0061] The raw material preheated by the preheating mechanism 4 enters the cement kiln 1 to be calcined into cement clinker;

[0062] S3, extraction operation;

[0063] The carbon dioxide gas generated during the calcination of raw materials in the cement kiln 1 enters the combustion decomposition furnace 2 through the ascending flue 9, and the carbon dioxide is transported to the high-temperature dust collector 502 of the gas heating mechanism 5 through the carbon dioxide delivery pipeline 12 for separation, and part of the carbon dioxide enters the waste heat boiler 503 and is stored after the waste heat is collected;

[0064] S4, reuse operation;

[0065] The remaining carbon dioxide enters through the inlet and outlet pipes 505 of the gas heating mechanism 5, and one of the output ends of the dual-axis motor 5062 drives the incomplete gear 5063 to rotate, and the incomplete gear 5063 is intermittently meshed with the complete gear 5064 so that the complete gear 5064 rotates intermittently, and the complete gear 5064 drives the opening and closing blade 5065 to rotate intermittently, so that the air inlet hole 5043 is opened and the air outlet hole 5044 is closed, and the carbon dioxide enters the pressurized chamber 5072 of the pressurized shell 5071. At the same time, the other output end of the dual-axis motor 5062 drives the output shaft 5066 to rotate, and the output shaft 5066 drives the worm 5076 to rotate, and the worm 5076 rotates. 076 drives the worm gear 5077 to rotate, and the worm gear 5077 drives the first crankshaft 5073 and the second crankshaft 5074 on both sides to rotate. The first crankshaft 5073 and the second crankshaft 5074 drive the pressurizing piston 5075 to move and pressurize in the pressurizing shell 5071, so that the gas inside the pressurizing chamber 5072 is squeezed. At this time, the fuel gas is pumped into the fuel gas delivery pipe 5011, and the ignition heater 5012 ignites it to heat the fluid medium in the medium circulation pipe A5013 and the medium circulation pipe B5014. Since the pressurizing chamber 5072 is located directly below the medium circulation pipe B5014, the carbon dioxide is efficiently heated and then enters the combustion decomposition furnace 2 for circulation again;

[0066] S5, residual heat treatment operation;

[0067] The fluid medium in the medium circulation pipe A5013 and the medium circulation pipe B5014 heated by the gas pumped in once by the gas heating mechanism 5 flows through the heat exchange pipe 13 wound around the feed pipe 8, and the residual heat is utilized again.

[0068] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A method for extracting high-purity carbon dioxide from a cement kiln system, characterized in that: The method is implemented based on an extraction device, which comprises a cement kiln (1), a combustion decomposition furnace (2), a grate cooler (3), a preheating mechanism (4), a gas heating mechanism (5), a smoke cooling chamber (6), a sealed feeder (7), a feed pipe (8), an ascending flue (9), a tertiary air duct (10), a smoke conveying pipe (11), a carbon dioxide conveying pipe (12) and a heat exchange pipe (13); The feed pipe (8) is connected to the preheating mechanism (4); the outlet of the preheating mechanism (4) is connected to the cement kiln (1) through the sealed feeder (7); the smoke cooling chamber (6) is arranged on the cement kiln (1); the cement kiln (1) is connected to the combustion decomposition furnace (2) through the ascending flue (9); the combustion decomposition furnace (2) is connected to the gas heating mechanism (5) through the input end of the carbon dioxide delivery pipe (12); the output end of the carbon dioxide delivery pipe (12) is connected to the preheating mechanism (4); the combustion decomposition furnace (2) is connected to the grate cooler (3) through the tertiary air duct (10); the combustion decomposition furnace (2) is connected to the preheating mechanism (4) through the flue gas delivery pipe (11); and the gas heating mechanism (5) is arranged around the feed pipe (8) through the heat exchange pipe (13); The gas heating mechanism (5) comprises a gas heater (501), a high-temperature dust collector (502) and a waste heat boiler (503); the carbon dioxide delivery pipeline (12) is connected to the high-temperature dust collector (502); the discharge end of the high-temperature dust collector (502) is connected to the gas heater (501); the gas outlet end of the high-temperature dust collector (502) is connected to the waste heat boiler (503); and the output end of the gas heater (501) is connected to the combustion decomposition furnace (2); The method comprises the following steps: S1, preheating operation; The raw material enters the preheating mechanism (4) through the feed pipe (8) for preliminary preheating and then enters the cement kiln (1) through the sealed feeder (7); S2, calcination operation; The raw material preheated by the preheating mechanism (4) enters the cement kiln (1) to be calcined into cement clinker; S3, extraction operation; Carbon dioxide gas generated during the calcination of raw materials in the cement kiln (1) enters the combustion decomposition furnace (2) through the ascending flue (9), the carbon dioxide is transported to the high-temperature dust collector (502) of the gas heating mechanism (5) through the carbon dioxide transport pipeline (12) for separation, and part of the carbon dioxide enters the waste heat boiler (503) for storage after waste heat is collected; S4, reuse operation; The remaining carbon dioxide passes through the gas heating mechanism (5), where the carbon dioxide is efficiently heated and then recirculated into the combustion decomposition furnace (2); S5, residual heat treatment operation; The fluid medium in the gas heater (501) heated by the gas pumped once by the gas heating mechanism (5) flows through the heat exchange pipe (13) wound around the feed pipe (8), and the residual heat is utilized again.

2. The method for extracting high-purity carbon dioxide from a cement kiln system according to claim 1, characterized in that: A bearing shell (504) is provided on the outside of the gas heater (501), an inlet and outlet pipe (505) is provided on the bearing shell (504), an intermittent opening and closing component (506) is provided on one end of the bearing shell (504) close to the inlet and outlet pipe (505), and a matching pressurizing component (507) is provided on one end of the bearing shell (504) away from the intermittent opening and closing component (506).

3. The method for extracting high-purity carbon dioxide from a cement kiln system according to claim 2, characterized in that: The gas heater (501) comprises a gas delivery pipe (5011), an ignition heater (5012), a medium flow pipe A (5013), a medium flow pipe B (5014) and an installation inner frame (5015); the installation inner frame (5015) is arranged inside the bearing shell (504) at a position close to the matching pressurizing component (507); the gas delivery pipe (5011) is arranged at one end of the installation inner frame (5015); the ignition heater (5012) is arranged at the output end of the gas delivery pipe (5011); the medium flow pipe A (5013) is arranged at one end of the installation inner frame (5015) away from the gas delivery pipe (5011); and the medium flow pipe B (5014) is connected to the medium flow pipe A (5013).

4. The method for extracting high-purity carbon dioxide from a cement kiln system according to claim 3, characterized in that: The medium circulation pipe A (5013) and the medium circulation pipe B (5014) are connected to each other, the medium circulation pipe A (5013) is in a straight pipe shape, and the medium circulation pipe B (5014) is in an 8-shaped surrounding shape.

5. The method for extracting high-purity carbon dioxide from a cement kiln system according to claim 4, characterized in that: The bearing shell (504) is provided with a mounting through hole A (5041) at one end close to the inlet and outlet pipe (505), the bearing shell (504) is provided with a mounting through hole B (5042) at the bottom end close to the mounting through hole A (5041), the bearing shell (504) is provided with an air inlet hole (5043) at a position below the mounting through hole B (5042), and the bearing shell (504) is further provided with an air outlet hole (5044) at a position close to one side of the air inlet hole (5043), the intermittent opening and closing component (506) is installed on the mounting through hole A (5041) and the mounting through hole B (5042), and the inlet and outlet pipe (505) is connected to the air inlet hole (5043) and the air outlet hole (5044).

6. The method for extracting high-purity carbon dioxide from a cement kiln system according to claim 5, characterized in that: The intermittent opening and closing component (506) comprises a heat-insulating card plate (5061), a dual-axis motor (5062), an incomplete gear (5063), a complete gear (5064), an opening and closing blade (5065) and an output shaft (5066), wherein the heat-insulating card plate (5061) is arranged inside the bearing shell (504), the dual-axis motor (5062) is mounted on the heat-insulating card plate (5061), the incomplete gear (5063) is rotatably connected to the mounting through hole A (5041), and one end of the incomplete gear (5063) away from the mounting through hole A (5041) is connected to the dual-axis motor. The output end of the double-axis motor (5062), the complete gear (5064) is rotatably connected to the mounting through hole B (5042), the incomplete gear (5063) is meshingly connected to the complete gear (5064), the opening and closing blade (5065) is connected to one end of the complete gear (5064) close to the inlet and outlet pipe (505), the output shaft (5066) is connected to the output end of the double-axis motor (5062) away from the incomplete gear (5063), and the end of the output shaft (5066) away from the double-axis motor (5062) is connected to the matching pressurizing component (507).

7. The method for extracting high-purity carbon dioxide from a cement kiln system according to claim 6, characterized in that: The mating pressurizing assembly (507) comprises a pressurizing shell (5071), a pressurizing chamber (5072), a first crankshaft (5073), a second crankshaft (5074), a pressurizing piston (5075), a worm (5076) and a worm wheel (5077); the pressurizing shell (5071) is symmetrically arranged inside the bearing shell (504) at a position close to the bottom of the gas heater (501); the pressurizing chamber (5072) is opened inside the pressurizing shell (5071); the first crankshaft (5073) is rotatably connected to the second crankshaft (5074); On the inner wall of the bearing shell (504), one end of the pressurizing piston (5075) is connected to the first crankshaft (5073) and the second crankshaft (5074), and the other end of the pressurizing piston (5075) is movably inserted in the pressurizing chamber (5072). The worm gear (5077) is connected between the first crankshaft (5073) and the second crankshaft (5074), one end of the worm gear (5077) is connected to the output shaft (5066), and the bottom end of the worm gear (5077) is meshingly connected to the worm gear (5077).

8. The method for extracting high-purity carbon dioxide from a cement kiln system according to claim 7, characterized in that: There is a gap between the rotating sections of the first crankshaft (5073) and the second crankshaft (5074), and the pressurizing chamber (5072) is located directly below the plurality of medium flow pipes B (5014).

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