Low-pressure oxygen enrichment device for hot air sintering system

Abstract

The utility model discloses a low-pressure oxygen enrichment device for a hot air sintering system. The low-pressure oxygen enrichment device for the hot air sintering system comprises an oxygen pipeline, a gas pipeline and a sintering ignition furnace. The oxygen pipeline comprises an oxygen generator, an oxygen mixer and an air blower, the oxygen mixer is provided with an air inlet, an oxygen inlet and an oxygen-enriched mixed gas outlet, the oxygen inlet is communicated with the oxygen generator, the oxygen-enriched mixed gas outlet is communicated with the air blower, and the sintering ignition furnace is communicated with the air blower and the gas pipeline. The oxygen generator conveys prepared low-pressure oxygen to the oxygen mixer for oxygen enrichment, oxygen-enriched mixed gas is conveyed into the sintering ignition furnace, and the sintering ignition furnace is located above the material level of a sintering machine of the hot air sintering system. The device can improve the oxygen enrichment rate of a sintering hot air system, realizes smooth ignition of low-heating-value coal gas in the ignition furnace, effectively improves the combustion efficiency of the sintering system and the quality of sintered ore products, solves the problem of energy level and grade waste of an existing oxygen enrichment mode, and reduces the sintering oxygen enrichment cost and energy consumption.

Description

Technical Field

[0001] The present application belongs to the technical field of sintering oxygen-enriched combustion, and specifically relates to a low-pressure oxygen-enriched device for a hot air sintering system. Background Art

[0002] In the hot air sintering system, the oxygen pipeline connected to the sintering ignition furnace includes a hot air blower, and oxygen is transported to the sintering ignition furnace through the hot air blower on the oxygen pipeline.

[0003] In the related art, during hot air sintering, the high-pressure and high-purity oxygen in the workshop is usually pressure-regulated and then transported to the hot air blower, and then oxygen-enriched after the hot air blower, and then transported to the sintering ignition furnace. Since the requirements for oxygen pressure and oxygen purity for sintering combustion are not high, it leads to the waste of oxygen pressure regulation energy level and the loss of oxygen purity grade. Utility Model Content

[0004] In order to solve the technical problems of wasting oxygen pressure regulation energy level and oxygen purity grade loss in the related art, the present application provides a low-pressure oxygen enrichment device for a hot air sintering system, comprising:

[0005] An oxygen pipeline, including an oxygen concentrator, an oxygen mixer and a blower, wherein the oxygen mixer is provided with an air inlet, an oxygen inlet and an oxygen-enriched mixed gas outlet, the oxygen inlet is connected to the oxygen concentrator, and the oxygen-enriched mixed gas outlet is connected to the blower;

[0006] Gas pipelines for transporting gas;

[0007] A sintering ignition furnace for ignition, wherein the sintering ignition furnace is connected to the blower and the gas pipeline.

[0008] In one embodiment, the oxygen pipeline further comprises a first shut-off valve, wherein the first shut-off valve is located between the oxygen concentrator and the oxygen mixer.

[0009] In one embodiment, the oxygen pipeline further includes a flow regulating valve and a flow meter, and the flow regulating valve and the flow meter are located between the first stop valve and the oxygen mixer.

[0010] In one embodiment, the oxygen pipeline further comprises a safety valve, and the safety valve is located between the flow regulating valve and the flow meter.

[0011] In one embodiment, the oxygen pipeline further comprises a rapid shut-off valve, wherein the rapid shut-off valve is located between the flow meter and the oxygen mixer.

[0012] In one embodiment, the oxygen pipeline further comprises a filter, and the filter is located between the first shut-off valve and the flow regulating valve.

[0013] In one embodiment, the oxygen pipeline further comprises a second shut-off valve, wherein the second shut-off valve is located between the quick shut-off valve and the oxygen mixer.

[0014] In one embodiment, the oxygen pipeline further comprises a flame arrester, and the flame arrester is located between the second shut-off valve and the oxygen mixer.

[0015] In one embodiment, the low-pressure oxygen-enriching device for the hot air sintering system further comprises:

[0016] The nitrogen pipeline comprises a nitrogen supply device, wherein the nitrogen supply device is connected to the oxygen pipeline and is located between the quick cut-off valve and the second stop valve.

[0017] In one embodiment, the hot air sintering system further comprises:

[0018] The sintering machine, wherein the sintering ignition furnace is located above the material surface of the sintering machine.

[0019] According to one or more embodiments of the present application, a low-pressure oxygen-enriching device for a hot air sintering system is provided. The low-pressure oxygen-enriching device for a hot air sintering system includes an oxygen pipeline, a gas pipeline for conveying coal gas, and a sintering ignition furnace for ignition. The oxygen pipeline includes an oxygen generator, an oxygen mixer, and a blower. The oxygen mixer is provided with an air inlet, an oxygen inlet, and an oxygen-enriched mixed gas outlet. The oxygen inlet is connected to the oxygen generator, and the oxygen-enriched mixed gas outlet is connected to the blower. The sintering ignition furnace is connected to the blower and the gas pipeline. The oxygen generator conveys the prepared low-pressure oxygen to the oxygen mixer for oxygen enrichment, and conveys the oxygen-enriched mixed gas to the sintering ignition furnace. By reducing the oxygen pressure and purity, the problems of waste of oxygen pressure regulation energy level and loss of oxygen purity grade can be effectively solved. This device can increase the oxygen enrichment rate of the sintering hot air system, realize the smooth ignition of low calorific value coal gas in the ignition furnace, effectively improve the combustion efficiency of the sintering system and the quality of sintered ore products, and solve the energy level and grade waste problems of existing oxygen enrichment methods, reducing sintering oxygen enrichment costs and energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a low-pressure oxygen-enriching device for a hot air sintering system in one or more embodiments of the present application;

[0021] Figure 2 It is a schematic structural diagram of a low-pressure oxygen-enriched device (including a sintering machine) used in a hot air sintering system in one or more embodiments of the present application.

[0022] Description of reference numerals:

[0023] 1. Oxygen generator; 2. Oxygen pipeline; 3. First stop valve; 4. Filter; 5. Flow regulating valve; 6. Safety valve; 7. Flow meter; 8. Quick shut-off valve; 9. Second stop valve; 10. Flame arrester; 11. Oxygen mixer; 13. Blower; 15. Sintering ignition furnace; 16. Gas pipeline; 17. Sintering machine; 18. Nitrogen pipeline; 19. Nitrogen supply device. DETAILED DESCRIPTION

[0024] 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.

[0025] The oxygen pipeline in the hot air sintering system connected with the ignition furnace includes a hot air blower, and oxygen is transported to the ignition furnace through the hot air blower on the oxygen pipeline.

[0026] The hot air sintering system usually uses air and gas to burn in the ignition furnace, and the heat is transferred from the ignition flame to the sintering material surface to ignite the solid fuel in the sintering material layer. This ignition and combustion method has disadvantages: first, the ignition and combustion has high requirements for the calorific value of the gas, and the low ignition temperature of the gas in the ignition furnace will cause the ignition to fail; second, the air is used as the combustion air, and the nitrogen content in the air is high. Nitrogen is an inert gas and will take away effective heat, reducing the combustion efficiency in the hot air sintering system, and will also cause nitrogen oxide pollution; third, the reduced combustion efficiency in the hot air sintering system will affect the combustion of the solid fuel, reduce the sintering yield, and affect the quality of the sintered products.

[0027] By analyzing the drawbacks of burning air and coal gas in the ignition furnace, in the related technology, during hot air sintering, the high-pressure and high-purity oxygen in the workshop is usually regulated from 1.0MPa to 1.6MPa to about 0.2MPa, and then transported to the hot air blower, and then enriched with oxygen after the hot air blower, and then transported to the ignition furnace. Since the requirements for oxygen pressure and oxygen purity for sintering combustion are not high, it leads to the waste of oxygen pressure regulation energy level and the loss of oxygen purity grade.

[0028] In order to solve the technical problems of wasting oxygen pressure regulation energy level and losing oxygen purity grade in related technologies, the present application provides a low-pressure oxygen enrichment device for a hot air sintering system, specifically a low-cost oxygen enrichment device for the steel industry that uses vacuum pressure swing adsorption oxygen production technology to supply low-pressure oxygen to a hot air sintering system.

[0029] See also Figure 1 to Figure 2The low-pressure oxygen-enriching device used in the hot air sintering system at least includes an oxygen pipeline, a gas pipeline for conveying coal gas, and a sintering ignition furnace for ignition.

[0030] The oxygen pipeline includes an oxygen generator 1, an oxygen mixer 11 and a blower 13. The oxygen generator 1, the oxygen mixer 11 and the blower 13 are connected to the oxygen pipeline 2 in sequence. The oxygen mixer 11 is provided with an interface of the oxygen pipeline 2 and is connected to the oxygen pipeline 2 by a flange connection. The oxygen mixer 11 is integrally welded to the inlet pipeline of the blower 13. The oxygen generator 1 is connected to one end of the oxygen pipeline 2, and the other end of the oxygen pipeline 2 is connected to the sintering ignition furnace 15. Usually, the outlet pipeline of the blower 13 is connected to the oxygen-enriched combustion-supporting hot air inlet of the sintering ignition furnace 15.

[0031] It should be noted that the material of the 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.

[0032] The oxygen mixer 11 is provided with an oxygen inlet and an air inlet, and the oxygen pipeline 2 is connected to the oxygen inlet, and the oxygen concentrator 1 is connected to the oxygen mixer 11 through the oxygen pipeline 2. The oxygen concentrator 1 is usually a vacuum pressure swing adsorption oxygen concentrator, which can provide oxygen with a purity of 80% and a pressure of 15-45 kPa. The vacuum pressure swing adsorption oxygen concentrator provides oxygen to the oxygen mixer 11 through the oxygen inlet, and the 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 is output from different nozzles, and because of the different angles of the nozzles, the oxygen and air can collide and mix evenly to reach a mixed state, so that the oxygen mixer 11 can output the homogeneously mixed oxygen to the blower 13 through the oxygen-enriched mixed gas outlet. The oxygen mixed by the oxygen mixer 11 is sent to the sintering ignition furnace 15 from the outlet pipe of the blower 13 under the boosting effect of the blower 13, so as to realize the combustion of the coal gas in the sintering ignition furnace 15.

[0033] The low-pressure oxygen enrichment device of the hot air sintering system uses a vacuum pressure swing adsorption oxygen generator as the oxygen supply source and adopts the oxygen enrichment method before the blower 13 to reduce energy consumption and loss of oxygen purity grade, and reduce the cost and energy consumption of sintering oxygen-enriched combustion.

[0034] The blower 13 can be a Roots blower or a centrifugal blower, etc. The inlet pipe of the blower 13 and the outlet pipe of the blower 13 can be made of 06Cr19Ni10. The specific material can also be set according to actual needs, and this application does not limit it.

[0035] Since the oxygen with a purity of 80% is evenly mixed with the air in the oxygen mixer 11, the purity of the oxygen output by the oxygen mixer 11 can be adjusted to about 23.5%, which meets the demand for oxygen-enriched combustion in the sintering ignition furnace 15. This ensures the oxygen purity required by the hot air sintering system and reduces the loss of oxygen purity grade. Compared with the hot air sintering system in the related art, which usually uses air and coal gas to burn in the sintering ignition furnace 15, the vacuum pressure swing adsorption oxygen generator provides sufficient oxygen. The increase in oxygen concentration can reduce the ignition energy of the coal gas in the sintering ignition furnace 15, and realize the ignition of low calorific value coal gas in the sintering ignition furnace 15, which can effectively improve the combustion efficiency and product quality of the hot air sintering system; at the same time, it can reduce the energy consumption and oxygen enrichment cost of the hot air sintering system, and improve the economic benefits and energy saving of the hot air sintering system.

[0036] The output oxygen pressure of the vacuum pressure swing adsorption oxygen generator is 15kPa-45kPa. The output oxygen is transported to the oxygen mixer 11 and mixed evenly with the air. The oxygen is pressurized by the blower 13 to the required pressure for transport to the sintering ignition furnace 15, so that the oxygen pressure level and oxygen purity are suitable for the oxygen-enriched combustion ignition system of the hot air sintering system. Compared with directly using the high-pressure and high-purity oxygen in the workshop to be input into the hot air sintering, this can prevent the waste of oxygen pressure regulation energy level.

[0037] See also Figure 1 to Figure 2 The gas pipeline 16 for conveying coal gas is arranged in parallel with the oxygen pipeline 2, and the gas outlet of the gas pipeline 16 is connected to the gas inlet of the sintering ignition furnace 15, and the sintering ignition furnace 15 is arranged on the sintering ignition furnace platform of the sintering machine 17. The coal gas is conveyed to the sintering ignition furnace 15 through the gas pipeline 16 and burns in the sintering ignition furnace 15 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 sintering ignition furnace 15. The low calorific value coal gas is input into the sintering ignition furnace 15 through the gas pipeline 16, and a coal gas combustion system is constructed in the sintering ignition furnace 15 to achieve stable ignition and combustion.

[0038] At the same time, compared with the combustion of air and coal gas in the sintering ignition furnace in the related art, the combustion of coal gas is realized in the oxygen-rich state in the sintering ignition furnace 15. Since the oxygen transported in the sintering ignition furnace 15 is a mixture of high-purity oxygen and air, the amount of air added in the sintering ignition furnace 15 is reduced to a certain extent, which also reduces the nitrogen content in the sintering ignition furnace 15, preventing nitrogen from taking away more effective heat, improving the combustion efficiency of the hot air sintering system, and also reducing the generation of nitrogen oxides to a certain extent, reducing pollution. Since the combustion efficiency of the hot air sintering system is improved, the sintering yield and product quality can be improved.

[0039] See also Figure 1 to Figure 2The low-pressure oxygen enrichment device for the hot air sintering system also includes a nitrogen pipeline (not shown in the figure), the nitrogen pipeline includes a nitrogen pipeline 18 and a nitrogen supply device 19, the nitrogen pipeline 18 is arranged in parallel with the oxygen pipeline 2, the nitrogen supply device 19 is connected to one end of the nitrogen pipeline 18, and the other end of the nitrogen pipeline 18 is connected to the oxygen pipeline 2, and is located between the vacuum pressure swing adsorption oxygen generator and the oxygen mixer 11 on the oxygen pipeline 2. When the sintering oxygen enrichment rate in the sintering ignition furnace 15 exceeds the set value or there is a safety hazard in the blower 13, the nitrogen supply device 19 transports nitrogen to the sintering ignition furnace 15 through the nitrogen pipeline 18 and the oxygen pipeline 2 in turn for nitrogen flushing protection. It should be noted that the set value of the sintering oxygen enrichment rate can be determined according to the sintering process requirements, and this application does not limit it.

[0040] It should be noted that the nitrogen supply device 19 is installed on the nitrogen pipeline 18, and the nitrogen is taken from the nitrogen network pipe. The pressure level is usually 0.6MPa~0.8MPa. The nitrogen can also be taken from other nitrogen supply equipment. It can be set according to actual conditions and this application does not limit it.

[0041] Understandably, the oxygen pipeline also includes a first stop valve 3 and a second stop valve 9, the first stop valve 3 is connected to the oxygen pipeline 2 by a flange connection, and is located between the vacuum pressure swing adsorption oxygen generator and the oxygen mixer 11; the nitrogen pipeline 18 is connected to the oxygen pipeline 2 and is located between the first stop valve 3 and the oxygen mixer 11 on the oxygen pipeline 2. The second stop valve 9 is connected to the oxygen pipeline 2 by a flange connection, and is located between the oxygen mixer 11 and the connection position of the nitrogen pipeline 18 on the oxygen pipeline 2. The first stop valve 3 and the second stop valve 9 can be oxygen stop valves with bypass forms. When the hot air sintering system needs to be overhauled, the first stop valve 3 and the second stop valve 9 can be closed to prevent the oxygen in the oxygen pipeline 2 from affecting the overhaul of the hot air sintering system, ensuring the effectiveness of the overhaul of the hot air sintering system while also improving convenience and efficiency.

[0042] In order to more accurately control the flow of oxygen in the oxygen pipeline 2 to meet the demand of oxygen in the oxygen mixer 11, the oxygen pipeline also includes a flow regulating valve 5 and a flow meter 7, which are respectively connected to the oxygen pipeline 2 by flange connection, and are located between the first stop valve 3 and the connection position of the nitrogen pipeline 18 on the oxygen pipeline 2. The material of the flow regulating valve 5 can be stainless steel, and the opening of the flow regulating valve 5 can be dynamically adjusted according to the indication of the flow meter 7 to adjust the flow of oxygen in the oxygen pipeline 2. The material of the flow meter 7 can be stainless steel, and the 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 flow meter 7 can be connected to the controller, and the flow and pressure of oxygen in the oxygen pipeline 2 can be displayed through a display connected to the controller. The flow regulating valve 5 can be adjusted according to the flow and pressure displayed on the display, combined with the flow of oxygen required in the oxygen mixer 11; at the same time, the use of the display can visualize the flow and pressure of oxygen in the oxygen pipeline, and improve the accuracy and convenience of the adjustment of the flow meter 7.

[0043] In order to improve the safety performance of the hot air sintering system, the oxygen pipeline also includes a safety valve 6 and a quick shut-off valve 8. The safety valve 6 is connected to the oxygen pipeline 2 by welding and is located between the flow regulating valve 5 and the flow meter 7. The quick shut-off valve 8 is connected to the oxygen pipeline 2 by flange connection and is located between the first shut-off valve 3 and the connection position of the nitrogen pipeline 18 on the oxygen pipeline 2.

[0044] The set pressure of the safety valve 6 is 0.1MPa. When the hot air sintering system is over-pressured, the valve of the safety valve 6 automatically opens and safely releases. The outlet pipe of the 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 safety valve 6. The quick cut-off 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 when the hot air sintering system is in normal working condition) is AC220V, and it can be connected to the controller and display the opening and closing state of the quick cut-off valve 8 on the display, so that the opening and closing state of the quick cut-off valve 8 can be visualized, improving the convenience and accuracy of the operation and control of the quick cut-off valve 8. At the same time, a chain protection program is provided between the quick cut-off valve 8 and the blower 13. When there is a safety hazard in the blower 13, the quick cut-off valve 8 quickly cuts off the oxygen supply in the oxygen pipeline 2 and performs nitrogen flushing protection to ensure the safety of the hot air sintering system.

[0045] In order to ensure the safety of various components connected to the oxygen pipeline 2, the oxygen pipeline also includes a filter 4, which is connected to the oxygen pipeline 2 by a flange connection and is located between the first stop valve 3 and the quick cut-off valve 8, specifically between the first stop valve 3 and the flow regulating valve 5. The maximum working pressure of the filter 4 is 55kPa, the mesh size is 0.16mm, and the filtering accuracy is at least 80 meshes. The shell of the filter 4 is made of stainless steel, the internal parts of the filter 4 are made of copper alloy or copper, and the filter screen is made of nickel-copper alloy, which can prevent impurities in the oxygen pipeline 2 from entering the subsequent system to damage various components connected to the oxygen pipeline 2, thereby improving the service life of various components.

[0046] The gas outlet of the gas pipeline 16 is connected to the sintering ignition furnace 15; the nitrogen pipeline includes a nitrogen pipeline 18 and a nitrogen supply device 19, the nitrogen supply device 19 is connected to one end of the nitrogen pipeline 18, and the other end of the nitrogen pipeline 18 is connected to the oxygen pipeline 2, and is located between the vacuum pressure swing adsorption oxygen generator and the oxygen mixer 11 of the oxygen pipeline 2. When there is a safety hazard in the blower 13, the quick cut-off valve 8 quickly cuts off the oxygen supply in the oxygen pipeline 2, and the nitrogen supply device 19 quickly opens and performs nitrogen flushing protection to ensure the safety of the hot air sintering system.

[0047] In order to prevent sparks in the sintering ignition furnace 15 from entering the oxygen pipeline 2, the oxygen pipeline further includes a flame arrester 10, which is connected to the 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 in the flame arrester 10 is 06Cr19Ni10.

[0048] 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.

[0049] Understandably, the low-pressure oxygen enrichment device for the hot air sintering system includes an oxygen pipeline, a gas pipeline and a nitrogen pipeline. The oxygen pipeline includes an oxygen pipeline 2 and a vacuum pressure swing adsorption oxygen generator 1, a first stop valve 3, a filter 4, a flow regulating valve 5, a safety valve 6, a flow meter 7, a quick cut-off valve 8, a second stop valve 9, a flame arrester 10, an oxygen mixer 11 and a blower 13 connected to the oxygen pipeline 2 in sequence. One end of the oxygen pipeline 2 is connected to the vacuum pressure swing adsorption oxygen generator, and the other end is connected to the sintering ignition furnace 15.

[0050] The oxygen generator provides low-pressure oxygen, and the oxygen generator transports the oxygen to the oxygen mixer for oxygen-enriched mixing, and transports the oxygen-enriched gas to the sintering ignition furnace. By reducing the oxygen pressure and oxygen purity, the waste of oxygen pressure regulation energy level and the loss of oxygen purity grade are reduced.

[0051] See also Figure 2The low-pressure oxygen-enriched device for the hot air sintering system also includes a sintering machine 17, and the sintering ignition furnace 15 is located above the material surface of the sintering machine 17. The coal gas is transported to the sintering ignition furnace 15 through the coal gas pipeline 16, and burns with the oxygen input through the blower 13 in the sintering ignition furnace 15. In the oxygen-enriched 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 sintering ignition furnace 15. The low calorific value coal gas is input into the sintering ignition furnace 15 through the coal gas pipeline 16, and a coal gas combustion system is constructed in the sintering ignition furnace 15 to achieve stable ignition and combustion.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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 low-pressure oxygen enrichment device for hot air sintering system, characterized in that: include: An oxygen pipeline, including an oxygen concentrator, an oxygen mixer and a blower, wherein the oxygen mixer is provided with an air inlet, an oxygen inlet and an oxygen-enriched mixed gas outlet, the oxygen inlet is connected to the oxygen concentrator, and the oxygen-enriched mixed gas outlet is connected to the blower; Gas pipelines for transporting gas; A sintering ignition furnace for ignition, wherein the sintering ignition furnace is connected to the blower and the gas pipeline.

2. The low-pressure oxygen enrichment device for hot air sintering system according to claim 1, characterized in that: The oxygen pipeline further includes a first stop valve, which is located between the oxygen concentrator and the oxygen mixer.

3. The low-pressure oxygen enrichment device for hot air sintering system according to claim 2, characterized in that: The oxygen pipeline further comprises a flow regulating valve and a flow meter, wherein the flow regulating valve and the flow meter are located between the first stop valve and the oxygen mixer.

4. The low-pressure oxygen enrichment device for hot air sintering system according to claim 3, characterized in that: The oxygen pipeline further comprises a safety valve, and the safety valve is located between the flow regulating valve and the flow meter.

5. The low-pressure oxygen enrichment device for hot air sintering system according to claim 3, characterized in that: The oxygen pipeline further comprises a quick cut-off valve, and the quick cut-off valve is located between the flow meter and the oxygen mixer.

6. The low-pressure oxygen enrichment device for hot air sintering system according to claim 3, characterized in that: The oxygen pipeline further includes a filter, and the filter is located between the first stop valve and the flow regulating valve.

7. The low-pressure oxygen enrichment device for hot air sintering system according to claim 5, characterized in that: The oxygen pipeline further comprises a second stop valve, and the second stop valve is located between the quick cut-off valve and the oxygen mixer.

8. The low-pressure oxygen enrichment device for hot air sintering system according to claim 7, characterized in that: The oxygen pipeline further includes a flame arrester, and the flame arrester is located between the second stop valve and the oxygen mixer.

9. The low-pressure oxygen enrichment device for hot air sintering system according to claim 7, characterized in that: Also includes: The nitrogen pipeline comprises a nitrogen supply device, wherein the nitrogen supply device is connected to the oxygen pipeline and is located between the quick cut-off valve and the second stop valve.

10. The low-pressure oxygen enrichment device for hot air sintering system according to claim 1, characterized in that: The low-pressure oxygen-enriched device also includes: The sintering machine, wherein the sintering ignition furnace is located above the material surface of the sintering machine.

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