High-low pressure coupling type lime kiln oxygen enrichment system

Abstract

The utility model discloses a high-low pressure coupling type lime kiln oxygen enrichment system which comprises an air supply system, and the air supply system comprises a low-pressure oxygen pipeline, a high-pressure oxygen pipeline and an oxygen loop pipe. The vacuum pressure swing adsorption oxygen generator, the oxygen mixer and the air blower are sequentially connected to the low-pressure oxygen pipeline, one end of the low-pressure oxygen pipeline is connected with the vacuum pressure swing adsorption oxygen generator, and the other end of the low-pressure oxygen pipeline is connected with the air blower. The high-pressure oxygen pipeline comprises a high-pressure oxygen pipeline, a second flow regulating valve, a pressure regulating valve, a second flow meter and a check valve, and the second flow regulating valve, the pressure regulating valve, the second flow meter and the check valve are sequentially connected to the high-pressure oxygen pipeline. And one end, close to the check valve, of the high-pressure oxygen pipeline is connected with an oxygen ring pipe on an inlet pipeline of the lime kiln. The vacuum pressure swing adsorption oxygen generator in the low-pressure oxygen pipeline provides low-pressure and low-purity oxygen, and an air blower front oxygen enrichment mode is adopted, so that the oxygen enrichment cost and energy consumption of the lime kiln production system are reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of lime kiln oxygen-enriched combustion, and specifically relates to a high-low pressure coupled lime kiln oxygen-enriched system. Background Art

[0002] In the process design stage, the carbon capture process is usually selected based on the CO2 emission concentration to balance investment and operating costs. According to relevant literature, the higher the CO2 emission concentration, the lower the carbon capture cost, and the more favorable it is for the recycling of CO2 resources. Therefore, energy-saving and upgrading equipment in steel plants to increase CO2 emission concentration is a requirement for carbon peak and an important way to achieve carbon neutrality.

[0003] The process of calcining quicklime in a lime kiln involves the combustion reaction of fossil energy and the high-temperature decomposition of CaCO3 to produce CO2. It is the production process with the highest carbon emission concentration in steel plants. Therefore, the CO2 emission concentration of lime kilns is higher than other combustion processes, usually exceeding 20%. Compared with ironmaking and steelmaking processes, it is more suitable for carbon capture, recovery and utilization. The lime kiln production system usually uses air-assisted combustion to calcine quicklime. If a blower is used to enrich oxygen for combustion, it can effectively achieve energy conservation and increase production in the lime kiln, improve the combustion characteristics in the furnace, and increase the CO2 concentration in the flue gas.

[0004] In the related art, the oxygen required for steel plant production is usually high pressure, and using high pressure oxygen to enrich the lime kiln production system will increase the oxygen enrichment cost of the lime kiln production system. Therefore, how to reduce the oxygen enrichment cost of the lime kiln production system has become an urgent problem to be solved. Utility Model Content

[0005] In order to solve the technical problem of high oxygen enrichment cost of lime kiln production system in the related art, the present application provides a high-low pressure coupled lime kiln oxygen enrichment system, the high-low pressure coupled lime kiln oxygen enrichment system includes a gas supply system, the gas supply system includes:

[0006] A low-pressure oxygen pipeline, the low-pressure oxygen pipeline comprising a low-pressure oxygen pipeline, a vacuum pressure swing adsorption oxygen generator, an oxygen mixer and a blower, the vacuum pressure swing adsorption oxygen generator, the oxygen mixer and the blower are sequentially connected to the low-pressure oxygen pipeline, and one end of the low-pressure oxygen pipeline is connected to the vacuum pressure swing adsorption oxygen generator;

[0007] A high-pressure oxygen pipeline, the high-pressure oxygen pipeline comprising a high-pressure oxygen pipeline, a second flow regulating valve, a pressure regulating valve, a second flow meter and a check valve, wherein the second flow regulating valve, the pressure regulating valve, the second flow meter and the check valve are sequentially connected to the high-pressure oxygen pipeline;

[0008] An oxygen ring pipe, one end of the high-pressure oxygen pipeline close to the check valve is connected to the oxygen ring pipe, and the oxygen ring pipe is located on the inlet pipe of the lime kiln.

[0009] In some embodiments, the low-pressure oxygen pipeline further includes a first stop valve, which is connected to the low-pressure oxygen pipeline and is located between the vacuum pressure swing adsorption oxygen generator and the oxygen mixer.

[0010] In some embodiments, the low-pressure oxygen pipeline further includes a first flow regulating valve and a first flow meter, wherein the first flow regulating valve and the first flow meter are connected to the low-pressure oxygen pipeline and are located between the first stop valve and the oxygen mixer.

[0011] In some embodiments, the low-pressure oxygen pipeline further includes a first safety valve, which is connected to the low-pressure oxygen pipeline and located between the first flow regulating valve and the first flow meter.

[0012] In some embodiments, the low-pressure oxygen pipeline further includes a first filter, which is connected to the low-pressure oxygen pipeline and located between the first shut-off valve and the first flow regulating valve.

[0013] In some embodiments, the low-pressure oxygen pipeline further includes a first rapid shut-off valve, which is connected to the low-pressure oxygen pipeline and located between the first flow meter and the oxygen mixer.

[0014] In some embodiments, the low-pressure oxygen pipeline further includes a second shut-off valve, which is connected to the low-pressure oxygen pipeline and is located between the first quick shut-off valve and the oxygen mixer.

[0015] In some embodiments, the low-pressure oxygen pipeline further includes a flame arrester, which is connected to the low-pressure oxygen pipeline and located between the second shut-off valve and the oxygen mixer.

[0016] In some embodiments, the high-pressure oxygen pipeline further includes a third stop valve, which is connected to the high-pressure oxygen pipeline and is located between the oxygen inlet of the high-pressure oxygen pipeline and the second flow regulating valve.

[0017] In some embodiments, the high-pressure oxygen pipeline further includes an oxygen release valve, which is connected to the high-pressure oxygen pipeline and is located between the third shut-off valve and the second flow regulating valve.

[0018] In some embodiments, the high-pressure oxygen pipeline further includes a second filter, which is connected to the high-pressure oxygen pipeline and is located between the oxygen release valve and the second flow regulating valve.

[0019] In some embodiments, the high-pressure oxygen pipeline further includes a fourth shut-off valve, which is connected to the high-pressure oxygen pipeline and is located between the pressure regulating valve and the second flow meter.

[0020] In some embodiments, the high-pressure oxygen pipeline further includes a second safety valve, which is connected to the high-pressure oxygen pipeline and is located between the fourth shut-off valve and the second flow meter.

[0021] In some embodiments, the high-pressure oxygen pipeline further includes a second rapid shut-off valve, which is connected to the high-pressure oxygen pipeline and is located between the second flow meter and the check valve.

[0022] In some embodiments, the high-low pressure coupled lime kiln oxygen-enriched system further comprises a combustion system, wherein the combustion system comprises:

[0023] lime kiln;

[0024] A gas pipeline for conveying coal gas, the gas pipeline is connected to the lime kiln, and the oxygen ring pipe is located on the inlet pipeline of the lime kiln.

[0025] According to the high-low pressure coupled lime kiln oxygen enrichment system provided by one or more embodiments of the present application, the high-low pressure coupled lime kiln oxygen enrichment system includes a gas supply system, and the gas supply system includes a low-pressure oxygen pipeline, a high-pressure oxygen pipeline and an oxygen ring pipe. The low-pressure oxygen pipeline includes a low-pressure oxygen pipeline, a vacuum pressure swing adsorption oxygen generator, an oxygen mixer and a blower. The vacuum pressure swing adsorption oxygen generator, the oxygen mixer and the blower are connected to the low-pressure oxygen pipeline in sequence, and one end of the low-pressure oxygen pipeline is connected to the vacuum pressure swing adsorption oxygen generator. The high-pressure oxygen pipeline includes a high-pressure oxygen pipeline, a second flow regulating valve, a pressure regulating valve, a second flow meter and a check valve. The second flow regulating valve, the pressure regulating valve, the second flow meter and the check valve are connected to the high-pressure oxygen pipeline in sequence. One end of the high-pressure oxygen pipeline close to the check valve is connected to the oxygen ring pipe, and the oxygen ring pipe is located on the lime kiln inlet pipeline. The vacuum pressure swing adsorption oxygen generator in the low-pressure oxygen pipeline provides low-pressure and low-purity oxygen, and adopts a blower-front oxygen enrichment method to reduce the cost and energy consumption of oxygen-enriched combustion in the lime kiln. The high-low pressure coupled lime kiln oxygen enrichment system includes a high-pressure oxygen enrichment system composed of a high-pressure oxygen pipeline and a low-pressure oxygen enrichment system composed of a low-pressure oxygen pipeline. The high-pressure oxygen enrichment system and the low-pressure oxygen enrichment system are connected in parallel and serve as backup for each other, which can ensure that the high-low pressure coupled lime kiln oxygen enrichment system can produce normally when parts fail or are under maintenance, improve the operational flexibility of oxygen enrichment in the lime kiln production system, and reduce the oxygen enrichment cost of the high-low pressure coupled lime kiln oxygen enrichment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a schematic structural diagram of a high-low pressure coupled lime kiln oxygen enrichment system in one or more embodiments of the present application.

[0027] Description of reference numerals:

[0028] 1. Vacuum pressure swing adsorption oxygen generator; 2. Low-pressure oxygen pipeline; 3. First stop valve; 4. First filter; 5. First flow regulating valve; 6. First safety valve; 7. First flow meter; 8. First quick shut-off valve; 9. Second stop valve; 10. Flame arrester; 11. Oxygen mixer; 13. Blower; 15. High-pressure oxygen pipeline; 16. Third stop valve; 17. Oxygen release valve; 18. Second filter; 19. Second flow regulating valve; 20. Pressure regulating valve; 21. Fourth stop valve; 23. Second safety valve; 24. Second flow meter; 25. Second quick shut-off valve; 26. Check valve; 27. Oxygen ring pipe. DETAILED DESCRIPTION

[0029] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0030] In order to solve the technical problem of high oxygen enrichment cost of lime kiln production system in the related art, the present application provides a high-low pressure coupled lime kiln oxygen enrichment system, which is suitable for lime kiln production in steel plants.

[0031] See also Figure 1 The high-low pressure coupled lime kiln oxygen enrichment system at least includes a low-pressure oxygen pipeline, a high-pressure oxygen pipeline and an oxygen ring pipe 27.

[0032] The low-pressure oxygen pipeline includes a low-pressure oxygen pipeline 2, a vacuum pressure swing adsorption oxygen generator 1, an oxygen mixer 11 and a blower 13. The vacuum pressure swing adsorption oxygen generator 1, the oxygen mixer 11 and the blower 13 are connected to the low-pressure oxygen pipeline 2 in sequence. The oxygen mixer 11 is provided with an interface of the low-pressure oxygen pipeline 2 and is connected to the low-pressure oxygen pipeline 2 by a flange connection. The oxygen mixer 11 is integrally welded to the inlet pipeline of the blower 13. The vacuum pressure swing adsorption oxygen generator 1 is connected to one end of the low-pressure oxygen pipeline 2, and the other end of the low-pressure oxygen pipeline 2 is connected to the blower 13.

[0033] It should be noted that the material of the low-pressure oxygen pipe 2 can be 06Cr19Ni10, or other materials that meet the requirements of the specifications. The specific material can be set according to actual needs and is not limited in this application.

[0034] The oxygen mixer 11 is provided with a low-pressure oxygen inlet and an air inlet, and the low-pressure oxygen pipeline 2 is connected to the low-pressure oxygen inlet, and the vacuum pressure swing adsorption oxygen concentrator 1 is connected to the oxygen mixer 11 through the low-pressure oxygen pipeline 2. The oxygen mixer 11 is an oxygen mixing component of the low-pressure oxygen pipeline, which ensures the homogeneous mixing of oxygen entering the low-pressure oxygen pipeline 2. The vacuum pressure swing adsorption oxygen concentrator 1 can provide oxygen with a purity of 80% and a pressure of 15 to 45 kPa. The vacuum pressure swing adsorption oxygen concentrator 1 provides oxygen to the oxygen mixer 11, and air enters the oxygen mixer 11 through the air inlet. A plurality of nozzles with different angles are arranged in the oxygen mixer 11, so that oxygen and air are output from different nozzles, and because of the different angles of the nozzles, oxygen and air can collide and mix evenly to reach a mixed state, so that the oxygen mixer 11 can output homogeneously mixed oxygen to the blower 13. The oxygen-enriched hot air obtained by mixing in the oxygen mixer 11 is sent into the lime kiln from the outlet pipe of the blower 13 under the boosting effect of the blower 13, so as to realize the oxygen-enriched calcination of the quicklime in the lime kiln.

[0035] The low-pressure oxygen pipeline uses the vacuum pressure swing adsorption oxygen generator 1 as the oxygen supply source, and adopts the oxygen enrichment method before the blower 13 to reduce energy consumption and the loss of oxygen purity grade, reduce the cost and energy consumption of oxygen-enriched combustion in the lime kiln, and realize the oxygen enrichment of the lime kiln while reducing the cost of oxygen-enriched combustion in the lime kiln.

[0036] The blower 13 can be a Roots blower or a centrifugal blower, etc. The inlet pipe and the outlet pipe of the blower 13 can be made of 06Cr19Ni10 respectively. The specific material can also be set according to actual needs, and this application does not limit it.

[0037] The high-pressure oxygen pipeline includes a high-pressure oxygen pipeline 15, a second flow regulating valve 19, a pressure regulating valve 20, a second flow meter 24 and a check valve 26, and the second flow regulating valve 19, the pressure regulating valve 20, the second flow meter 24 and the check valve 26 are sequentially connected to the high-pressure oxygen pipeline 15;

[0038] The high-pressure oxygen in the high-pressure oxygen pipeline 15 is taken to the oxygen network, and the oxygen purity is 99.6%, and the oxygen pressure is 1.0-1.6 MPa. The material of the high-pressure oxygen pipeline 15 can be 06Cr19Ni10, or other materials that meet the requirements of the specification, which can be set according to the actual situation, and this application does not make specific restrictions.

[0039] The second flow regulating valve 19 can be connected to the high-pressure oxygen pipeline 15 by flange connection. The valve material of the second flow regulating valve 19 is stainless steel or copper, so that the high-pressure oxygen flow rate can be accurately regulated to ensure the effective operation of the high-low pressure coupled lime kiln oxygen enrichment system. The pressure regulating valve 20 can also be connected to the high-pressure oxygen pipeline 15 by flange connection. The valve material of the pressure regulating valve 20 is stainless steel or copper. Usually, the inlet pressure of the pressure regulating valve 20 is 1.6MPa and the outlet pressure is 0.6MPa. The second flow meter 24 can be an orifice flow meter, or a mass flow meter can be used according to the pipeline layout. The check valve 26 is connected to the high-pressure oxygen pipeline 15 by flange connection. The valve material of the check valve 26 is stainless steel or copper, which prevents the air in the lime kiln from flowing back into the high-pressure oxygen pipeline 15, ensuring the safety of the operation of the high-low pressure coupled lime kiln oxygen enrichment system. The outlet of the check valve 26 is connected to the oxygen inlet of the oxygen ring pipe 27. The oxygen ring pipe 27 is arranged on the outlet pipe of the blower 13 (the inlet pipe of the lime kiln). The oxygen-enriched oxygen of 0.6 MPa obtained by pressure regulation by the pressure regulating valve 20 is transported to the lime kiln through the oxygen ring pipe 27 for oxygen-enriched calcination of quicklime.

[0040] One end of the high-pressure oxygen pipeline 15 near the check valve 26 is connected to an oxygen ring pipe 27, and the oxygen ring pipe 27 is located on the lime kiln inlet pipe. The outlet of the check valve 26 is connected to the oxygen inlet of the oxygen ring pipe 27, and the oxygen ring pipe 27 is arranged on the outlet pipe of the blower 13 (lime kiln inlet pipe).

[0041] The high-low pressure coupled lime kiln oxygen enrichment system includes a high-pressure oxygen enrichment system composed of a high-pressure oxygen pipeline and a low-pressure oxygen enrichment system composed of a low-pressure oxygen pipeline. The high-pressure oxygen enrichment system and the low-pressure oxygen enrichment system are connected in parallel and serve as backup for each other, which can ensure that the high-low pressure coupled lime kiln oxygen enrichment system can produce normally when parts fail or are under maintenance, improve the operational flexibility of oxygen enrichment in the lime kiln production system, and reduce the oxygen enrichment cost of the high-low pressure coupled lime kiln oxygen enrichment system.

[0042] The high-low pressure coupled lime kiln oxygen enrichment system has two oxygen enrichment modes: a high-pressure oxygen enrichment mode composed of a high-pressure oxygen enrichment system and a low-pressure oxygen enrichment mode composed of a low-pressure oxygen enrichment system. The oxygen enrichment is performed after and before the blower 13, respectively, to improve the oxygen enrichment rate and combustion efficiency of the lime kiln production system, which is helpful to build a CO2 resource recycling system and achieve energy conservation and emission reduction goals; and the oxygen enrichment cost is low, the operation flexibility is large, and it is suitable for steel plants where high-pressure oxygen is not abundant. At the same time, it can also increase lime production, improve the calcination environment of quicklime calcination in the lime kiln, increase CO2 concentration, and be conducive to CO2 resource recycling.

[0043] The high-low pressure coupled lime kiln oxygen enrichment system uses high-pressure oxygen and low-pressure oxygen from the steel plant as gas sources to achieve oxygen enrichment in the lime kiln. The improvement of the oxygen enrichment rate of the lime kiln production system can improve the calcination conditions of quicklime in the lime kiln, which is conducive to the forward combustion reaction, increases the CO2 emission concentration, and reduces the cost of carbon capture and resource utilization.

[0044] The output oxygen pressure of the vacuum pressure swing adsorption oxygen generator 1 is 15kPa-45kPa, which can meet the requirements of delivering the output oxygen to the oxygen mixer 11 and mixing it evenly with the air, and the oxygen pressure level and oxygen purity are suitable for oxygen-enriched combustion in the lime kiln through the blower 13. This can not only improve the oxygen enrichment rate, combustion efficiency and product quality in the lime kiln, but also reduce the energy consumption and oxygen enrichment cost of lime kiln combustion, and improve the economic benefits and energy saving of lime kiln combustion.

[0045] Understandably, the low-pressure oxygen pipeline also includes a first stop valve 3, which is connected to the low-pressure oxygen pipeline 2 by a flange connection and is located between the vacuum pressure swing adsorption oxygen generator 1 and the oxygen mixer 11. The first stop valve 3 can be an oxygen stop valve with a bypass form. When the high-low pressure coupled lime kiln oxygen enrichment system needs to be repaired, the first stop valve 3 can be closed to prevent the oxygen in the low-pressure oxygen pipeline from affecting the maintenance, thereby ensuring the effectiveness of the maintenance of the device and improving the convenience and efficiency of the maintenance of the device.

[0046] In order to more accurately control the flow rate of oxygen in the low-pressure oxygen pipeline 2 to meet the demand for oxygen in the oxygen mixer 11, the oxygen pipeline also includes a first flow regulating valve 5 and a first flow meter 7, which are respectively connected to the low-pressure oxygen pipeline 2 by flange connection, and are located between the first stop valve 3 and the oxygen mixer 11. The material of the first flow regulating valve 5 can be stainless steel, and the opening of the first flow regulating valve 5 can be dynamically adjusted according to the indication of the first flow meter 7 to adjust the flow rate of oxygen in the low-pressure oxygen pipeline 2. The material of the first flow meter 7 can be stainless steel, and the first flow meter 7 can be an orifice flow meter or a mass flow meter, which can realize temperature and pressure correction and instantaneous and cumulative measurement. The first flow meter 7 can be connected to the controller, and the flow rate and pressure of oxygen in the low-pressure oxygen pipeline 2 can be displayed through a display connected to the controller. The first flow regulating valve 5 can be adjusted according to the flow rate and pressure displayed on the display, combined with the flow rate of oxygen required in the oxygen mixer 11. At the same time, the use of the display can visualize the flow rate and pressure of oxygen in the low-pressure oxygen pipeline 2, and improve the accuracy and convenience of the adjustment of the first flow meter 7.

[0047] In order to improve the safety performance of the system, the oxygen pipeline also includes a first safety valve 6, which is connected to the low-pressure oxygen pipeline 2 by welding and is located between the first flow regulating valve 5 and the first flow meter 7. The set pressure of the first safety valve 6 is 0.1MPa. When the low-pressure oxygen pipeline 2 is over-pressured, the valve of the first safety valve 6 automatically opens and releases safely. The outlet pipeline of the first safety valve 6 is led to a safe place, which is usually more than 4m above the operating surface to ensure the safety of the release of the first safety valve 6.

[0048] In order to ensure the safety of various components connected to the low-pressure oxygen pipeline 2, the low-pressure oxygen pipeline also includes a first filter 4, which is connected to the low-pressure oxygen pipeline 2 by a flange connection and is located between the first stop valve 3 and the first flow regulating valve 5. The maximum working pressure of the first filter 4 is 55kPa, the mesh size is 0.16mm, and the filtering accuracy is at least 80 meshes. The shell of the first filter 4 is made of stainless steel, the internal parts of the first filter 4 are made of copper alloy or copper, and the filter screen is made of nickel-copper alloy, which can prevent the impurities contained in the oxygen in the low-pressure oxygen pipeline 2 from entering the subsequent system to damage various components connected to the low-pressure oxygen pipeline 2, thereby improving the service life of various components.

[0049] The low-pressure oxygen pipeline also includes a first quick-cut valve 8, and the valve core of the first quick-cut valve 8 is made of stainless steel. The first quick-cut valve 8 is connected to the low-pressure oxygen pipeline 2 and is located between the first flowmeter 7 and the oxygen mixer 11. The first quick-cut valve 8 can be an air-open type, and the control voltage of the solenoid valve and the proximity switch (it should be noted that the proximity switch is a single coil and must not be powered under normal working conditions) is AC220V, and can be connected to the controller and display the opening and closing state of the valve of the first quick-cut valve 8 on the display, so that the opening and closing state of the first quick-cut valve 8 can be visualized, and the convenience and accuracy of the operation and control of the first quick-cut valve 8 can be improved. The first quick-cut valve 8 and the blower 13 are provided with an interlocking protection program. When there is a safety hazard in the blower 13, the first quick-cut valve 8 quickly cuts off the low-pressure oxygen supply to ensure the safe operation of the high-low pressure coupled lime kiln oxygen enrichment system.

[0050] The low-pressure oxygen pipeline also includes a second stop valve 9, which is connected to the low-pressure oxygen pipeline 2 and is located between the first quick shut-off valve 8 and the oxygen mixer 11. The second stop valve 9 is connected to the low-pressure oxygen pipeline 2 by a flange connection and is located between the first quick shut-off valve 8 and the oxygen mixer 11. The second stop valve 9 can be an oxygen stop valve with a bypass form. When the high-low pressure coupled lime kiln oxygen enrichment system needs to be repaired, the first stop valve 3 and the second stop valve 9 can be closed to prevent the oxygen in the low-pressure oxygen pipeline from affecting the maintenance of the high-low pressure coupled lime kiln oxygen enrichment system, thereby ensuring the effectiveness of the device maintenance and improving the convenience and efficiency of the device maintenance.

[0051] In order to prevent sparks generated by the lime kiln system from entering the low-pressure oxygen pipeline 2, the oxygen pipeline also includes a flame arrester 10, which is connected to the low-pressure oxygen pipeline 2 by welding and is located between the second stop valve 9 and the oxygen mixer 11. The material of the flame arrester section of the flame arrester 10 is copper, and the material of the short pipes at both ends of the flame arrester section is 06Cr19Ni10.

[0052] In some embodiments, the type of the flame arrester 10 can also be set according to actual needs, and this application does not limit it.

[0053] The first safety valve 6, the first quick shut-off valve 8 and the flame arrester 10 are safety facilities of the low-pressure oxygen pipeline, which improve the safety of the operation of the low-pressure oxygen pipeline.

[0054] Understandably, the high-pressure oxygen pipeline also includes a third stop valve 16 and an oxygen release valve 17. The third stop valve 16 is connected to the high-pressure oxygen pipeline 15 by a flange connection, and is located between the oxygen inlet of the high-pressure oxygen pipeline 15 and the second flow regulating valve 19. The valve core material of the third stop valve 16 can be copper.

[0055] The oxygen release valve 17 is connected to the high-pressure oxygen pipeline 15 and is located between the third stop valve 16 and the second flow regulating valve 19. The oxygen release valve 17 can be connected to the high-pressure oxygen pipeline 15 by welding, and the valve material of the oxygen release valve 17 can be copper. When the high-pressure oxygen pipeline fails to be repaired, the valve of the oxygen release valve 17 can be manually opened to empty the oxygen in the high-pressure oxygen pipeline 15 to ensure the safety of the repair operation.

[0056] The high-pressure oxygen pipeline also includes a second filter 18, which is connected to the high-pressure oxygen pipeline 15 by flange connection and is located between the oxygen release valve 17 and the second flow regulating valve 19. The second filter 18 is a straight-through impurity removal device with a filtration accuracy of at least 80 meshes.

[0057] Understandably, the high-pressure oxygen pipeline further includes a fourth stop valve 21, which is connected to the high-pressure oxygen pipeline 15 by a flange and is located between the pressure regulating valve 20 and the second flow meter 24. The valve core of the fourth stop valve 21 is made of copper.

[0058] The high-pressure oxygen pipeline also includes a second safety valve 23, which is connected to the high-pressure oxygen pipeline 15 and is located between the fourth stop valve 21 and the second flow meter 24. The set pressure of the second safety valve 23 is 0.8MPa, and the outlet pipeline of the second safety valve 23 needs to be led to a safe place. When the high-pressure oxygen pipeline is over-pressured, the second safety valve 23 automatically opens and releases pressure to ensure the operational safety of the high-pressure oxygen pipeline.

[0059] The high-pressure oxygen pipeline also includes a second quick-cut valve 25, which is connected to the high-pressure oxygen pipeline 15 and is located between the second flow meter 24 and the check valve 26. The second quick-cut valve 25 and the blower 13 are provided with an interlocking protection program. When a failure or an accident occurs in the high- and low-pressure coupled lime kiln oxygen-enriched system, the second quick-cut valve 25 can be quickly closed to automatically cut off the supply of high-pressure oxygen.

[0060] Understandably, the high-low pressure coupled lime kiln oxygen enrichment system includes a low-pressure oxygen pipeline, a high-pressure oxygen pipeline and an oxygen ring pipe 27. The low-pressure oxygen pipeline includes a low-pressure oxygen pipeline 2 and a vacuum pressure swing adsorption oxygen generator 1, a first stop valve 3, a first filter 4, a first flow regulating valve 5, a first safety valve 6, a first flow meter 7, a first quick shut-off valve 8, a second stop valve 9, a flame arrester 10, an oxygen mixer 11 and a blower 13 connected to the low-pressure oxygen pipeline 2 in sequence. One end of the low-pressure oxygen pipeline 2 is connected to the vacuum pressure swing adsorption oxygen generator 1, and the other end is connected to the blower 13.

[0061] The high-pressure oxygen pipeline includes a high-pressure oxygen pipeline 15 and a third stop valve 16, an oxygen release valve 17, a second filter 18, a second flow regulating valve 19, a pressure regulating valve 20, a fourth stop valve 21, a second safety valve 23, a second flow meter 24, a second quick shut-off valve 25 and a check valve 26 which are sequentially connected to the high-pressure oxygen pipeline 15. One end of the high-pressure oxygen pipeline 15 close to the check valve 26 is connected to the oxygen ring pipe 27.

[0062] The high-low pressure coupled lime kiln oxygen enrichment system uses high-pressure oxygen and low-pressure oxygen from the steel plant as gas sources to achieve oxygen enrichment in the lime kiln, with low oxygen enrichment costs and high operational flexibility. The improvement of the oxygen enrichment rate of the lime kiln production system can improve the conditions for calcining quicklime in the lime kiln, which is conducive to the forward combustion reaction, increases the CO2 emission concentration, and reduces the cost of carbon capture and resource utilization.

[0063] The high-low pressure coupled lime kiln oxygen enrichment system is provided with components such as manual relief, safety relief, quick shut-off valve and check valve and can be interlocked with the blower 13 to improve the safety performance of the high-low pressure coupled lime kiln oxygen enrichment system.

[0064] The low-pressure oxygen pipeline uses a vacuum pressure swing adsorption oxygen generator to provide low-pressure and low-purity oxygen, and adopts oxygen enrichment in front of the blower to reduce the cost and energy consumption of oxygen-enriched combustion in the lime kiln. The high-low pressure coupled lime kiln oxygen enrichment system includes a high-pressure oxygen enrichment system composed of high-pressure oxygen pipelines and a low-pressure oxygen enrichment system composed of low-pressure oxygen pipelines. The high-pressure oxygen enrichment system and the low-pressure oxygen enrichment system are connected in parallel and standby for each other, which can ensure that the high-low pressure coupled lime kiln oxygen enrichment system can produce normally when parts fail or are under maintenance, improve the operational flexibility of oxygen enrichment in the lime kiln production system, and reduce the oxygen enrichment cost of the high-low pressure coupled lime kiln oxygen enrichment system.

[0065] The high-low pressure coupled lime kiln oxygen enrichment system also includes a lime kiln, a gas pipeline for conveying coal gas, and a high-low pressure coupled lime kiln oxygen enrichment system. The gas pipeline is connected to the lime kiln, and the oxygen ring pipe 27 is connected to the lime kiln and is located on the inlet pipe of the lime kiln.

[0066] The gas pipeline for conveying coal gas is respectively arranged in parallel with the low-pressure oxygen pipeline and the high-pressure oxygen pipeline, and the gas outlet of the gas pipeline is connected to the gas inlet of the lime kiln. The coal gas is conveyed to the lime kiln through the gas pipeline and burns in the lime kiln with the oxygen input through the blower 13. In the oxygen-rich state, the ignition temperature of the coal gas can be ensured, the calorific value requirements of the coal gas can be met, and the coal gas can be ensured to burn in the lime kiln. The low calorific value coal gas is conveyed into the lime kiln through the gas pipeline, and a coal gas combustion system is constructed in the lime kiln to achieve stable ignition and combustion.

[0067] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0068] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0069] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0070] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0071] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A high-low pressure coupled lime kiln oxygen enrichment system, characterized in that: The high-low pressure coupled lime kiln oxygen enrichment system includes a gas supply system, and the gas supply system includes: A low-pressure oxygen pipeline, the low-pressure oxygen pipeline comprising a low-pressure oxygen pipeline, a vacuum pressure swing adsorption oxygen generator, an oxygen mixer and a blower, the vacuum pressure swing adsorption oxygen generator, the oxygen mixer and the blower are sequentially connected to the low-pressure oxygen pipeline, and one end of the low-pressure oxygen pipeline is connected to the vacuum pressure swing adsorption oxygen generator; A high-pressure oxygen pipeline, the high-pressure oxygen pipeline comprising a high-pressure oxygen pipeline, a second flow regulating valve, a pressure regulating valve, a second flow meter and a check valve, wherein the second flow regulating valve, the pressure regulating valve, the second flow meter and the check valve are sequentially connected to the high-pressure oxygen pipeline; An oxygen ring pipe, one end of the high-pressure oxygen pipeline close to the check valve is connected to the oxygen ring pipe, and the oxygen ring pipe is located on the inlet pipe of the lime kiln.

2. The high-low pressure coupled lime kiln oxygen enrichment system according to claim 1, characterized in that: The low-pressure oxygen pipeline also includes a first stop valve, which is connected to the low-pressure oxygen pipeline and is located between the vacuum pressure swing adsorption oxygen generator and the oxygen mixer.

3. The high-low pressure coupled lime kiln oxygen enrichment system according to claim 2, characterized in that: The low-pressure oxygen pipeline further includes a first flow regulating valve and a first flow meter, wherein the first flow regulating valve and the first flow meter are connected to the low-pressure oxygen pipeline and are located between the first stop valve and the oxygen mixer.

4. The high-low pressure coupled lime kiln oxygen enrichment system according to claim 3 is characterized in that: The low-pressure oxygen pipeline further includes a first quick-cut-off valve, which is connected to the low-pressure oxygen pipeline and is located between the first flow meter and the oxygen mixer.

5. The high-low pressure coupled lime kiln oxygen enrichment system according to claim 4, characterized in that: The low-pressure oxygen pipeline also includes a second stop valve, which is connected to the low-pressure oxygen pipeline and is located between the first quick shut-off valve and the oxygen mixer.

6. The high-low pressure coupled lime kiln oxygen enrichment system according to claim 1, characterized in that: The high-pressure oxygen pipeline further includes a third stop valve, which is connected to the high-pressure oxygen pipeline and is located between the oxygen inlet of the high-pressure oxygen pipeline and the second flow regulating valve.

7. The high-low pressure coupled lime kiln oxygen enrichment system according to claim 6, characterized in that: The high-pressure oxygen pipeline further includes an oxygen release valve, which is connected to the high-pressure oxygen pipeline and is located between the third stop valve and the second flow regulating valve.

8. The high-low pressure coupled lime kiln oxygen enrichment system according to claim 1, characterized in that: The high-pressure oxygen pipeline further includes a fourth stop valve, which is connected to the high-pressure oxygen pipeline and is located between the pressure regulating valve and the second flow meter.

9. The high-low pressure coupled lime kiln oxygen enrichment system according to claim 1, characterized in that: The high-pressure oxygen pipeline further includes a second quick-cut-off valve, which is connected to the high-pressure oxygen pipeline and is located between the second flow meter and the check valve.

10. The high-low pressure coupled lime kiln oxygen enrichment system according to claim 1, characterized in that: Also included is a combustion system, the combustion system comprising: lime kiln; A gas pipeline for conveying coal gas, the gas pipeline is connected to the lime kiln, and the oxygen ring pipe is located on the inlet pipeline of the lime kiln.

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